chore: comment out again rules validation for now

Signed-off-by: Lorenzo Fontana <lo@linux.com>
update(userspace/libhawk): further explaination for rules provider
2026-03-20 11:42:06 +00:00 · 2021-01-21 10:50:47 +01:00 · 2021-01-21 10:49:52 +01:00 · 2021-01-21 10:49:52 +01:00 · 2021-01-21 10:49:52 +01:00 · 2021-01-21 10:49:52 +01:00
76 changed files with 3984 additions and 1155 deletions
--- a/.circleci/OWNERS
+++ b/.circleci/OWNERS
@@ -0,0 +1,4 @@
+approvers:
+  - jonahjon
+reviewers:
+  - jonahjon
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -452,6 +452,25 @@ jobs:
            docker build --build-arg FALCO_IMAGE_TAG=master -t falcosecurity/falco-driver-loader:master docker/driver-loader
            echo ${DOCKERHUB_SECRET} | docker login -u ${DOCKERHUB_USER} --password-stdin
            docker push falcosecurity/falco-driver-loader:master
+  # Publish container images to AWS ECR Public
+  "publish/container-images-aws-dev":
+    docker:
+      - image: docker:stable
+    steps:
+      - attach_workspace:
+          at: /
+      - checkout
+      - setup_remote_docker
+      - run:
+          name: Build and publish falco to AWS
+          command: |
+            apk update
+            apk add --update groff less py-pip
+            pip install awscli
+            FALCO_VERSION=$(cat /build/release/userspace/falco/config_falco.h | grep 'FALCO_VERSION ' | cut -d' ' -f3 | sed -e 's/^"//' -e 's/"$//')
+            docker build --build-arg VERSION_BUCKET=deb-dev --build-arg FALCO_VERSION=${FALCO_VERSION} -t "public.ecr.aws/falcosecurity/falco:master" docker/falco
+            aws ecr-public get-login-password --region us-east-1 | docker login --username AWS --password-stdin public.ecr.aws/falcosecurity
+            docker push "public.ecr.aws/falcosecurity/falco:master"
  # Publish the packages
  "publish/packages":
    docker:
@@ -518,6 +537,26 @@ jobs:
            echo ${DOCKERHUB_SECRET} | docker login -u ${DOCKERHUB_USER} --password-stdin
            docker push "falcosecurity/falco-driver-loader:${CIRCLE_TAG}"
            docker push "falcosecurity/falco-driver-loader:latest"
+  # Publish container images to AWS ECR Public
+  "publish/container-images-aws":
+    docker:
+      - image: docker:stable
+    steps:
+      - attach_workspace:
+          at: /
+      - checkout
+      - setup_remote_docker
+      - run:
+          name: Build and publish falco to AWS
+          command: |
+            apk update
+            apk add --update groff less py-pip
+            pip install awscli
+            docker build --build-arg VERSION_BUCKET=deb --build-arg FALCO_VERSION=${CIRCLE_TAG} -t "public.ecr.aws/falcosecurity/falco:${CIRCLE_TAG}" docker/falco
+            docker tag "public.ecr.aws/falcosecurity/falco:${CIRCLE_TAG}" public.ecr.aws/falcosecurity/falco:latest
+            aws ecr-public get-login-password --region us-east-1 | docker login --username AWS --password-stdin public.ecr.aws/falcosecurity
+            docker push "public.ecr.aws/falcosecurity/falco:${CIRCLE_TAG}"
+            docker push "public.ecr.aws/falcosecurity/falco:latest"
 workflows:
  version: 2
  build_and_test:
@@ -577,7 +616,16 @@ workflows:
          requires:
            - "publish/packages-dev"
            - "tests/driver-loader/integration"
-      - "quality/static-analysis"
+      - "publish/container-images-aws-dev":
+          context: test-infra # contains Falco AWS credentials
+          filters:
+            tags:
+              ignore: /.*/
+            branches:
+              only: master
+          requires:
+            - publish/docker-dev
+      # - "quality/static-analysis" # This is temporarly disabled: https://github.com/falcosecurity/falco/issues/1526
  release:
    jobs:
      - "build/musl":
@@ -620,3 +668,12 @@ workflows:
              only: /.*/
            branches:
              ignore: /.*/
+      - "publish/container-images-aws":
+          context: test-infra # contains Falco AWS credentials
+          requires:
+            - "publish/docker"
+          filters:
+            tags:
+              only: /.*/
+            branches:
+              ignore: /.*/
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,6 @@
 *~
 *.pyc

-test/falco_tests.yaml
 test/traces-negative
 test/traces-positive
 test/traces-info
--- a/ADOPTERS.md
+++ b/ADOPTERS.md
@@ -10,7 +10,7 @@ This is a list of production adopters of Falco (in alphabetical order):

 * [GitLab](https://about.gitlab.com/direction/defend/container_host_security/) - GitLab is a complete DevOps platform, delivered as a single application, fundamentally changing the way Development, Security, and Ops teams collaborate. GitLab Ultimate provides the single tool teams need to find, triage, and fix vulnerabilities in applications, services, and cloud-native environments enabling them to manage their risk. This provides them with repeatable, defensible processes that automate security and compliance policies. GitLab includes a tight integration with Falco, allowing users to defend their containerized applications from attacks while running in production.

-* [League](https://league.com/ca/) - League provides health benefits management services to help employees understand and get the most from their benefits, and employers to provide effective, efficient plans. Falco is used to monitor our deployed services on Kubernetes, protecting against malicious access to containerswhich could lead to leaks of PHI or other sensitive data. The Falco alerts are logged in Stackdriver for grouping and further analysis. In the future, we're hoping for integrations with Prometheus and AlertManager as well.
+* [League](https://league.com/ca/) - League provides health benefits management services to help employees understand and get the most from their benefits, and employers to provide effective, efficient plans. Falco is used to monitor our deployed services on Kubernetes, protecting against malicious access to containers which could lead to leaks of PHI or other sensitive data. The Falco alerts are logged in Stackdriver for grouping and further analysis. In the future, we're hoping for integrations with Prometheus and AlertManager as well.

 * [Logz.io](https://logz.io/) - Logz.io is a cloud observability platform for modern engineering teams. The Logz.io platform consists of three products — Log Management, Infrastructure Monitoring, and Cloud SIEM — that work together to unify the jobs of monitoring, troubleshooting, and security. We empower engineers to deliver better software by offering the world's most popular open source observability tools — the ELK Stack, Grafana, and Jaeger — in a single, easy to use, and powerful platform purpose-built for monitoring distributed cloud environments. Cloud SIEM supports data from multiple sources, including Falco's alerts, and offers useful rules and dashboards content to visualize and manage incidents across your systems in a unified UI.
  * https://logz.io/blog/k8s-security-with-falco-and-cloud-siem/
@@ -26,5 +26,5 @@ This is a list of production adopters of Falco (in alphabetical order):

 * [Sumo Logic](https://www.sumologic.com/) - Sumo Logic provides a SaaS based log aggregation service that provides dashboards and applications to easily identify and analyze problems in your application and infrastructure. Sumo Logic provides native integrations for many CNCF projects, such as Falco, that allows end users to easily collect Falco events and analyze Falco events on DecSecOps focused dashboards.

-*  [Sysdig](https://www.sysdig.com/) Sysdig originally created Falco in 2016 to detect unexpected or suspicious activity using a rules engine on top of the data that comes from the sysdig kernel system call probe. Sysdig provides tooling to help with vulnerability management, compliance, detection, incident response and forensics in Cloud-native environments. Sysdig Secure has extended falco to include: a rule library, the ability to update macros, lists & rules via the user interface and API, automated tuning of rules, and rule creation based on profiling known system behavior. On top of the basic Falco rules, Sysdig Secure implements the concept of a "Security policy" that can comprise several rules which are evaluated for a user-define infrastructure scope like Kubernetes namespaces, OpenShift clusters, deployment workload, cloud regions etc.
+*  [Sysdig](https://www.sysdig.com/) Sysdig originally created Falco in 2016 to detect unexpected or suspicious activity using a rules engine on top of the data that comes from the sysdig kernel system call probe. Sysdig provides tooling to help with vulnerability management, compliance, detection, incident response and forensics in Cloud-native environments. Sysdig Secure has extended Falco to include: a rule library, the ability to update macros, lists & rules via the user interface and API, automated tuning of rules, and rule creation based on profiling known system behavior. On top of the basic Falco rules, Sysdig Secure implements the concept of a "Security policy" that can comprise several rules which are evaluated for a user-defined infrastructure scope like Kubernetes namespaces, OpenShift clusters, deployment workload, cloud regions etc.

--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,71 @@
 # Change Log

+## v0.27.0
+
+Released on 2021-01-18
+
+### Major Changes
+
+* new: Added falco engine version to grpc version service [[#1507](https://github.com/falcosecurity/falco/pull/1507)] - [@nibalizer](https://github.com/nibalizer)
+* BREAKING CHANGE: Users who run Falco without a config file will be unable to do that any more, Falco now expects a configuration file to be passed all the times. Developers may need to adjust their processes. [[#1494](https://github.com/falcosecurity/falco/pull/1494)] - [@nibalizer](https://github.com/nibalizer)
+* new: asynchronous outputs implementation, outputs channels will not block event processing anymore [[#1451](https://github.com/falcosecurity/falco/pull/1451)] - [@leogr](https://github.com/leogr)
+* new: slow outputs detection [[#1451](https://github.com/falcosecurity/falco/pull/1451)] - [@leogr](https://github.com/leogr)
+* new: `output_timeout` config option for slow outputs detection [[#1451](https://github.com/falcosecurity/falco/pull/1451)] - [@leogr](https://github.com/leogr)
+
+
+### Minor Changes
+
+* build: bump b64 to v2.0.0.1 [[#1441](https://github.com/falcosecurity/falco/pull/1441)] - [@fntlnz](https://github.com/fntlnz)
+* rules(macro container_started): re-use `spawned_process` macro inside `container_started` macro [[#1449](https://github.com/falcosecurity/falco/pull/1449)] - [@leodido](https://github.com/leodido)
+* docs: reach out documentation [[#1472](https://github.com/falcosecurity/falco/pull/1472)] - [@fntlnz](https://github.com/fntlnz)
+* docs: Broken outputs.proto link [[#1493](https://github.com/falcosecurity/falco/pull/1493)] - [@deepskyblue86](https://github.com/deepskyblue86)
+* docs(README.md): correct broken links [[#1506](https://github.com/falcosecurity/falco/pull/1506)] - [@leogr](https://github.com/leogr)
+* docs(proposals): Exceptions handling proposal [[#1376](https://github.com/falcosecurity/falco/pull/1376)] - [@mstemm](https://github.com/mstemm)
+* docs: fix a broken link of README [[#1516](https://github.com/falcosecurity/falco/pull/1516)] - [@oke-py](https://github.com/oke-py)
+* docs: adding the kubernetes privileged use case to use cases [[#1484](https://github.com/falcosecurity/falco/pull/1484)] - [@fntlnz](https://github.com/fntlnz)
+* rules(Mkdir binary dirs): Adds exe_running_docker_save as an exception as this rules can be triggerred when a container is created. [[#1386](https://github.com/falcosecurity/falco/pull/1386)] - [@jhwbarlow](https://github.com/jhwbarlow)
+* rules(Create Hidden Files): Adds exe_running_docker_save as an exception as this rules can be triggerred when a container is created. [[#1386](https://github.com/falcosecurity/falco/pull/1386)] - [@jhwbarlow](https://github.com/jhwbarlow)
+* docs(.circleci): welcome Jonah (Amazon) as a new Falco CI maintainer [[#1518](https://github.com/falcosecurity/falco/pull/1518)] - [@leodido](https://github.com/leodido)
+* build: falcosecurity/falco:master also available on the AWS ECR Public registry [[#1512](https://github.com/falcosecurity/falco/pull/1512)] - [@leodido](https://github.com/leodido)
+* build: falcosecurity/falco:latest also available on the AWS ECR Public registry [[#1512](https://github.com/falcosecurity/falco/pull/1512)] - [@leodido](https://github.com/leodido)
+* update: gRPC clients can now subscribe to drop alerts via gRCP API [[#1451](https://github.com/falcosecurity/falco/pull/1451)] - [@leogr](https://github.com/leogr)
+* macro(allowed_k8s_users): exclude cloud-controller-manage to avoid false positives on k3s [[#1444](https://github.com/falcosecurity/falco/pull/1444)] - [@fntlnz](https://github.com/fntlnz)
+
+
+### Bug Fixes
+
+* fix(userspace/falco): use given priority in falco_outputs::handle_msg() [[#1450](https://github.com/falcosecurity/falco/pull/1450)] - [@leogr](https://github.com/leogr)
+* fix(userspace/engine): free formatters, if any [[#1447](https://github.com/falcosecurity/falco/pull/1447)] - [@leogr](https://github.com/leogr)
+* fix(scripts/falco-driver-loader): lsmod usage [[#1474](https://github.com/falcosecurity/falco/pull/1474)] - [@dnwe](https://github.com/dnwe)
+* fix: a bug that prevents Falco driver to be consumed by many Falco instances in some circumstances [[#1485](https://github.com/falcosecurity/falco/pull/1485)] - [@leodido](https://github.com/leodido)
+* fix: set `HOST_ROOT=/host` environment variable for the `falcosecurity/falco-no-driver` container image by default [[#1492](https://github.com/falcosecurity/falco/pull/1492)] - [@leogr](https://github.com/leogr)
+
+
+### Rule Changes
+
+* rule(list user_known_change_thread_namespace_binaries): add crio and multus to the list [[#1501](https://github.com/falcosecurity/falco/pull/1501)] - [@Kaizhe](https://github.com/Kaizhe)
+* rule(Container Run as Root User): new rule created [[#1500](https://github.com/falcosecurity/falco/pull/1500)] - [@Kaizhe](https://github.com/Kaizhe)
+* rule(Linux Kernel Module injection detected): adds a new rule that detects when an LKM module is injected using `insmod` from a container (typically used by rootkits looking to obfuscate their behavior via kernel hooking). [[#1478](https://github.com/falcosecurity/falco/pull/1478)] - [@d1vious](https://github.com/d1vious)
+* rule(macro multipath_writing_conf): create and use the macro [[#1475](https://github.com/falcosecurity/falco/pull/1475)] - [@nmarier-coveo](https://github.com/nmarier-coveo)
+* rule(list falco_privileged_images): add calico/node without registry prefix to prevent false positive alerts [[#1457](https://github.com/falcosecurity/falco/pull/1457)] - [@czunker](https://github.com/czunker)
+* rule(Full K8s Administrative Access): use the right list of admin users (fix) [[#1454](https://github.com/falcosecurity/falco/pull/1454)] - [@mstemm](https://github.com/mstemm)
+
+
+### Non user-facing changes
+
+* chore(cmake): remove unnecessary whitespace patch [[#1522](https://github.com/falcosecurity/falco/pull/1522)] - [@leogr](https://github.com/leogr)
+* remove stale bot in favor of the new lifecycle bot [[#1490](https://github.com/falcosecurity/falco/pull/1490)] - [@leodido](https://github.com/leodido)
+* chore(cmake): mark some variables as advanced [[#1496](https://github.com/falcosecurity/falco/pull/1496)] - [@deepskyblue86](https://github.com/deepskyblue86)
+* chore(cmake/modules): avoid useless rebuild [[#1495](https://github.com/falcosecurity/falco/pull/1495)] - [@deepskyblue86](https://github.com/deepskyblue86)
+* build: BUILD_BYPRODUCTS for civetweb [[#1489](https://github.com/falcosecurity/falco/pull/1489)] - [@fntlnz](https://github.com/fntlnz)
+* build: remove duplicate item from FALCO_SOURCES [[#1480](https://github.com/falcosecurity/falco/pull/1480)] - [@leodido](https://github.com/leodido)
+* build: make our integration tests report clear steps for CircleCI UI [[#1473](https://github.com/falcosecurity/falco/pull/1473)] - [@fntlnz](https://github.com/fntlnz)
+* further improvements outputs impl.  [[#1443](https://github.com/falcosecurity/falco/pull/1443)] - [@leogr](https://github.com/leogr)
+* fix(test): make integration tests properly fail [[#1439](https://github.com/falcosecurity/falco/pull/1439)] - [@leogr](https://github.com/leogr)
+* Falco outputs refactoring [[#1412](https://github.com/falcosecurity/falco/pull/1412)] - [@leogr](https://github.com/leogr)
+
+
+
 ## v0.26.2

 Released on 2020-11-10
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,6 +19,15 @@ option(BUILD_WARNINGS_AS_ERRORS "Enable building with -Wextra -Werror flags" OFF
 option(MINIMAL_BUILD "Build a minimal version of Falco, containing only the engine and basic input/output (EXPERIMENTAL)" OFF)
 option(MUSL_OPTIMIZED_BUILD "Enable if you want a musl optimized build" OFF)

+# We shouldn't need to set this, see https://gitlab.kitware.com/cmake/cmake/-/issues/16419
+option(EP_UPDATE_DISCONNECTED "ExternalProject update disconnected" OFF)
+if (${EP_UPDATE_DISCONNECTED})
+  set_property(
+    DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+    PROPERTY EP_UPDATE_DISCONNECTED TRUE)
+endif()
+
+
 # Elapsed time
 # set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CMAKE_COMMAND} -E time") # TODO(fntlnz, leodido): add a flag to enable this

@@ -217,6 +226,7 @@ set(FALCO_ABSOLUTE_SHARE_DIR "${CMAKE_INSTALL_PREFIX}/${FALCO_SHARE_DIR}")
 set(FALCO_BIN_DIR bin)

 add_subdirectory(scripts)
+add_subdirectory(userspace/libhawk)
 add_subdirectory(userspace/engine)
 add_subdirectory(userspace/falco)
 add_subdirectory(tests)
--- a/GOVERNANCE.md
+++ b/GOVERNANCE.md
@@ -1,55 +0,0 @@
-# Process for becoming a maintainer
-
-* Express interest to the existing maintainers that you or your organization is interested in becoming a
-  maintainer. Becoming a maintainer generally means that you are going to be spending substantial
-  time (>25%) on Falco for the foreseeable future. You should have domain expertise and be extremely
-  proficient in C++. Ultimately your goal is to become a maintainer that will represent your
-  organization.
-* We will expect you to start contributing increasingly complicated PRs, under the guidance
-  of the existing maintainers.
-* We may ask you to do some PRs from our backlog.
-* As you gain experience with the code base and our standards, we will ask you to do code reviews
-  for incoming PRs (i.e., all maintainers are expected to shoulder a proportional share of
-  community reviews).
-* After a period of approximately 2-3 months of working together and making sure we see eye to eye,
-  the existing maintainers will confer and decide whether to grant maintainer status or not.
-  We make no guarantees on the length of time this will take, but 2-3 months is the approximate
-  goal.
-
-## Maintainer responsibilities
-
-* Monitor Slack (delayed response is perfectly acceptable).
-* Triage GitHub issues and perform pull request reviews for other maintainers and the community.
-* During GitHub issue triage, apply all applicable [labels](https://github.com/falcosecurity/falco/labels)
-  to each new issue. Labels are extremely useful for future issue follow up. Which labels to apply
-  is somewhat subjective so just use your best judgment.
-* Make sure that ongoing PRs are moving forward at the right pace or closing them.
-* Participate when called upon in the security releases. Note that although this should be a rare
-  occurrence, if a serious vulnerability is found, the process may take up to several full days of
-  work to implement. This reality should be taken into account when discussing time commitment
-  obligations with employers.
-* In general continue to be willing to spend at least 25% of ones time working on Falco (~1.25
-  business days per week).
-
-## When does a maintainer lose maintainer status
-
-If a maintainer is no longer interested or cannot perform the maintainer duties listed above, they
-should volunteer to be moved to emeritus status. In extreme cases this can also occur by a vote of
-the maintainers per the voting process below.
-
-# Conflict resolution and voting
-
-In general, we prefer that technical issues and maintainer membership are amicably worked out
-between the persons involved. If a dispute cannot be decided independently, the maintainers can be
-called in to decide an issue. If the maintainers themselves cannot decide an issue, the issue will
-be resolved by voting. The voting process is a simple majority in which each senior maintainer
-receives two votes and each normal maintainer receives one vote.
-
-# Adding new projects to the falcosecurity GitHub organization
-
-New projects will be added to the falcosecurity organization via GitHub issue discussion in one of the
-existing projects in the organization. Once sufficient discussion has taken place (~3-5 business
-days but depending on the volume of conversation), the maintainers of *the project where the issue
-was opened* (since different projects in the organization may have different maintainers) will
-decide whether the new project should be added. See the section above on voting if the maintainers
-cannot easily decide.
--- a/README.md
+++ b/README.md
@@ -21,21 +21,21 @@ Read the [change log](CHANGELOG.md).

 The Falco Project, originally created by [Sysdig](https://sysdig.com), is an incubating [CNCF](https://cncf.io) open source cloud native runtime security tool.
 Falco makes it easy to consume kernel events, and enrich those events with information from Kubernetes and the rest of the cloud native stack.
-Falco has a rich rule set of security rules specifically built for Kubernetes, Linux, and cloud-native.
+Falco has a rich set of security rules specifically built for Kubernetes, Linux, and cloud-native.
 If a rule is violated in a system, Falco will send an alert notifying the user of the violation and its severity.

 ### Installing Falco

-If you would like to run Falco in **production** please adhere to the [official installation guide](https://falco.org/docs/installation/).
+If you would like to run Falco in **production** please adhere to the [official installation guide](https://falco.org/docs/getting-started/installation/).

 ##### Kubernetes

 | Tool     | Link                                                                                       | Note                                                               |
 |----------|--------------------------------------------------------------------------------------------|--------------------------------------------------------------------|
 | Helm     | [Chart Repository](https://github.com/falcosecurity/charts/tree/master/falco#introduction) | The Falco community offers regular helm chart releases.            |
-| Minikube | [Tutorial](https://falco.org/docs/third-party/#minikube)                                   | The Falco driver has been baked into minikube for easy deployment. |
-| Kind     | [Tutorial](https://falco.org/docs/third-party/#kind)                                       | Running Falco with kind requires a driver on the host system.      |
-| GKE      | [Tutorial](https://falco.org/docs/third-party/#gke)                                        | We suggest using the eBPF driver for running Falco on GKE.         |
+| Minikube | [Tutorial](https://falco.org/docs/getting-started/third-party/#minikube)                                   | The Falco driver has been baked into minikube for easy deployment. |
+| Kind     | [Tutorial](https://falco.org/docs/getting-started/third-party/#kind)                                       | Running Falco with kind requires a driver on the host system.      |
+| GKE      | [Tutorial](https://falco.org/docs/getting-started/third-party/#gke)                                        | We suggest using the eBPF driver for running Falco on GKE.         |

 ### Developing

--- a/RELEASE.md
+++ b/RELEASE.md
@@ -28,8 +28,8 @@ Before cutting a release we need to do some homework in the Falco repository. Th

 - Double-check if any hard-coded version number is present in the code, it should be not present anywhere:
    - If any, manually correct it then open an issue to automate version number bumping later
-    - Versions table in the `README.md` update itself automatically
- Generate the change log https://github.com/leodido/rn2md, or https://fs.fntlnz.wtf/falco/milestones-changelog.txt for the lazy people (it updates every 5 minutes)
+    - Versions table in the `README.md` updates itself automatically
+- Generate the change log https://github.com/leodido/rn2md:
    - If you review timeout errors with `rn2md` try to generate an GitHub Oauth access token and use `-t`
 - Add the latest changes on top the previous `CHANGELOG.md`
 - Submit a PR with the above modifications
@@ -69,13 +69,12 @@ Now assume `x.y.z` is the new version.
    | deb      | [![deb](https://img.shields.io/badge/Falco-x.y.z-%2300aec7?style=flat-square)](https://dl.bintray.com/falcosecurity/deb/stable/falco-x.y.z-x86_64.deb) |
    | tgz      | [![tgz](https://img.shields.io/badge/Falco-x.y.z-%2300aec7?style=flat-square)](https://dl.bintray.com/falcosecurity/bin/x86_64/falco-x.y.z-x86_64.deb) |

-    | Images                                                          |
-    | --------------------------------------------------------------- |
-    | `docker pull docker.io/falcosecurity/falco:_tag_`               |
-    | `docker pull docker.io/falcosecurity/falco-driver-loader:_tag_` |
-    | `docker pull docker.io/falcosecurity/falco-no-driver:_tag_`     |
-
-    <!-- Copy the relevant part of the changelog here -->
+    | Images                                                                      |
+    | --------------------------------------------------------------------------- |
+    | `docker pull docker.io/falcosecurity/falco:x.y.z`                           |
+    | `docker pull public.ecr.aws/falcosecurity/falco:x.y.z`                      |
+    | `docker pull docker.io/falcosecurity/falco-driver-loader:x.y.z`             |
+    | `docker pull docker.io/falcosecurity/falco-no-driver:x.y.z`                 |

    ### Statistics

--- a/brand/README.md
+++ b/brand/README.md
@@ -11,8 +11,9 @@ Content in this document can be used to publically share about Falco.

 ### Logo

-You can find the Falco logo in PNG and SVG in different colors in
-the [CNCF's artwork repository](https://github.com/cncf/artwork/blob/master/examples/incubating.md#falco-logos).
+There are 3 logos available for use in this directory. Use the primary logo unless required otherwise due to background issues, or printing.
+
+The Falco logo is Apache 2 licensed and free to use in media and publication for the CNCF Falco project.

 ### Colors

--- a/brand/primary-logo.png
+++ b/brand/primary-logo.png
--- a/brand/teal-logo.svg
+++ b/brand/teal-logo.svg
@@ -0,0 +1 @@
+<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 708.41 374.92"><defs><style>.cls-1{fill:#00b4c8;}</style></defs><title>Falco horizontal logo_teal2</title><g id="fqqZXT"><path class="cls-1" d="M204.69,154.4Q151.5,208,98,261.25a48.42,48.42,0,0,1-5.27,4.87c-2.55,1.89-5.34,2-7.65-.45s-1.51-5,.41-7.06c4.6-4.94,9.35-9.74,14.13-14.5q52.56-52.31,105.14-104.59c3.35-3.34,18.05,7.52,21.58,11.1"/><path class="cls-1" d="M215.06,171.36c-.15,2.14-1.54,3.55-2.93,4.94l-87.82,87.79c-2.75,2.74-6,5.42-9.46,1.68-3.15-3.39-.5-6.44,2.06-9q43.44-43.44,86.89-86.87c2.21-2.22,4.58-4.23,8-3A4.61,4.61,0,0,1,215.06,171.36Z"/><path class="cls-1" d="M70.93,71c2.42-.09,4.09,1.31,5.64,2.87q41.82,41.79,83.61,83.59c2.6,2.61,5,5.74,1.69,9s-6.41,1-9-1.66Q111,123,69.25,81.2c-2.09-2.1-3.72-4.39-2.45-7.53A4.34,4.34,0,0,1,70.93,71Z"/><path class="cls-1" d="M203.42,268c-5,1-8.9-1.34-12.45-5-6.35-6.61-12.87-13-19.41-19.46-3.85-3.8-4-7.41-.14-11.28,11.14-11.07,22.21-22.21,33.35-33.29,2.45-2.44,5.43-4.49,8.55-1.55,3.48,3.29,1.19,6.41-1.39,9-8.74,8.84-17.44,17.73-26.4,26.35-3.4,3.27-3.93,5.72-.19,9.06,4.22,3.78,8.13,7.91,12,12,2.54,2.68,5.35,4.25,9.18,4.11s8.28-.12,8.16,5.09c-.12,5-4.74,4.8-8.4,5.14A21,21,0,0,1,203.42,268Z"/><path class="cls-1" d="M148.7,178.36c-.75,3.49-2.68,5.6-6.43,4.36a13,13,0,0,1-4.74-3.31q-30.11-30-60.1-60a23.14,23.14,0,0,1-2.56-3c-1.72-2.42-1.88-5,.3-7.11s4.84-1.76,7,.26c3.65,3.42,7.17,7,10.71,10.53q25.65,25.64,51.28,51.3C146.12,173.37,148.49,175.13,148.7,178.36Z"/><path class="cls-1" d="M133.74,192.93a4.9,4.9,0,0,1-2.53,4.29,5.37,5.37,0,0,1-6.63-.95c-3.35-3.1-6.57-6.34-9.8-9.57q-14.34-14.3-28.61-28.63a34.27,34.27,0,0,1-4.17-5,4.57,4.57,0,0,1,.36-6,5,5,0,0,1,6-1.12,11.65,11.65,0,0,1,3.7,2.58q19.44,19.33,38.79,38.76C132.4,188.85,133.77,190.54,133.74,192.93Z"/></g><path class="cls-1" d="M413.15,190.86a25.57,25.57,0,0,0-10.35-6.63,46.78,46.78,0,0,0-16-2.37A83.35,83.35,0,0,0,372,183.12a75.16,75.16,0,0,0-10.58,2.53l2.37,15.48a53.47,53.47,0,0,1,9-2.21A72.44,72.44,0,0,1,385,198a22.61,22.61,0,0,1,8.13,1.26,13,13,0,0,1,5.22,3.56,13.23,13.23,0,0,1,2.76,5.29,24.6,24.6,0,0,1,.79,6.32v3.16a61.65,61.65,0,0,0-7.42-1.34,57.43,57.43,0,0,0-6.64-.4,61.45,61.45,0,0,0-13,1.35,32.26,32.26,0,0,0-11,4.42,22.7,22.7,0,0,0-7.51,8,24.09,24.09,0,0,0-2.76,12A28.39,28.39,0,0,0,356,254.05a21.6,21.6,0,0,0,6.79,8.22,28.56,28.56,0,0,0,10.51,4.58,60.24,60.24,0,0,0,13.58,1.42A137.25,137.25,0,0,0,407,266.93c5.94-.9,10.4-1.66,13.35-2.29V214.56a50.84,50.84,0,0,0-1.66-13.35A24.93,24.93,0,0,0,413.15,190.86Zm-11.3,61.3a71.4,71.4,0,0,1-13.43.94q-7.26,0-11.53-2.6t-4.26-9.4a10,10,0,0,1,1.57-5.77,10.67,10.67,0,0,1,4.19-3.55,20.18,20.18,0,0,1,5.85-1.74,43.43,43.43,0,0,1,6.39-.47,42.23,42.23,0,0,1,6.64.47,37,37,0,0,1,4.58,1Z"/><path class="cls-1" d="M461.38,248.44a9.27,9.27,0,0,1-2-4,26.17,26.17,0,0,1-.55-5.85V143.94l-19.12,3.16v95.1a40.74,40.74,0,0,0,1.35,11,17.57,17.57,0,0,0,4.66,8.06,21.71,21.71,0,0,0,8.92,5,52,52,0,0,0,14.14,1.89l2.69-15.8a29.78,29.78,0,0,1-6.24-1.34A8.76,8.76,0,0,1,461.38,248.44Z"/><path class="cls-1" d="M532.2,251.05a49.24,49.24,0,0,1-9.64.95q-13.11,0-18.64-7.19t-5.53-19.51q0-12.8,5.85-19.83t17.06-7a40.4,40.4,0,0,1,8.92.95,43.38,43.38,0,0,1,7.51,2.37l4.1-15.64a57.88,57.88,0,0,0-22.11-4.26,42.15,42.15,0,0,0-17.06,3.31,37.35,37.35,0,0,0-12.88,9.17,40.64,40.64,0,0,0-8.14,13.82,50.82,50.82,0,0,0-2.84,17.14,56.83,56.83,0,0,0,2.53,17.3A37.22,37.22,0,0,0,489,256.34a34.82,34.82,0,0,0,13,9,47.83,47.83,0,0,0,18.4,3.24,68.05,68.05,0,0,0,13.19-1.27,39.84,39.84,0,0,0,9.56-2.84l-2.69-15.8A45,45,0,0,1,532.2,251.05Z"/><path class="cls-1" d="M625.77,207.37a40.7,40.7,0,0,0-8.14-13.67,35.23,35.23,0,0,0-12.56-8.76,40.93,40.93,0,0,0-16-3.08,40.34,40.34,0,0,0-16,3.08,36.32,36.32,0,0,0-12.56,8.76,39.88,39.88,0,0,0-8.21,13.67,51.31,51.31,0,0,0-2.93,17.77A52,52,0,0,0,552.31,243a40.47,40.47,0,0,0,8.13,13.75,36.57,36.57,0,0,0,12.48,8.85A40.14,40.14,0,0,0,589,268.74a40.69,40.69,0,0,0,16.19-3.15,36.32,36.32,0,0,0,12.56-8.85A39.7,39.7,0,0,0,625.85,243a53.47,53.47,0,0,0,2.84-17.85A51.55,51.55,0,0,0,625.77,207.37Zm-22,37.52q-5.29,7.28-14.77,7.27t-14.77-7.27q-5.29-7.26-5.3-19.75,0-12.31,5.3-19.51T589,198.44q9.48,0,14.77,7.19t5.29,19.51Q609.1,237.62,603.81,244.89Z"/><path class="cls-1" d="M347.24,218h-47.8v50.57H279.65V150h75.89v15.88h-56.1v36.23h47.8Z"/></svg>
--- a/brand/white-logo.png
+++ b/brand/white-logo.png
--- a/cmake/modules/OpenSSL.cmake
+++ b/cmake/modules/OpenSSL.cmake
@@ -10,6 +10,7 @@
 # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 # specific language governing permissions and limitations under the License.
 #
+mark_as_advanced(OPENSSL_BINARY)
 if(NOT USE_BUNDLED_DEPS)
  find_package(OpenSSL REQUIRED)
  message(STATUS "Found openssl: include: ${OPENSSL_INCLUDE_DIR}, lib: ${OPENSSL_LIBRARIES}")
@@ -20,6 +21,8 @@ if(NOT USE_BUNDLED_DEPS)
    message(STATUS "Found openssl: binary: ${OPENSSL_BINARY}")
  endif()
 else()
+  mark_as_advanced(OPENSSL_BUNDLE_DIR OPENSSL_INSTALL_DIR OPENSSL_INCLUDE_DIR
+    OPENSSL_LIBRARY_SSL OPENSSL_LIBRARY_CRYPTO)
  set(OPENSSL_BUNDLE_DIR "${PROJECT_BINARY_DIR}/openssl-prefix/src/openssl")
  set(OPENSSL_INSTALL_DIR "${OPENSSL_BUNDLE_DIR}/target")
  set(OPENSSL_INCLUDE_DIR "${PROJECT_BINARY_DIR}/openssl-prefix/src/openssl/include")
--- a/cmake/modules/gRPC.cmake
+++ b/cmake/modules/gRPC.cmake
@@ -22,6 +22,7 @@ if(NOT USE_BUNDLED_DEPS)
  endif()

  # c-ares
+  mark_as_advanced(CARES_INCLUDE CARES_LIB)
  find_path(CARES_INCLUDE NAMES ares.h)
  find_library(CARES_LIB NAMES libcares.so)
  if(CARES_INCLUDE AND CARES_LIB)
@@ -31,6 +32,7 @@ if(NOT USE_BUNDLED_DEPS)
  endif()

  # protobuf
+  mark_as_advanced(PROTOC PROTOBUF_INCLUDE PROTOBUF_LIB)
  find_program(PROTOC NAMES protoc)
  find_path(PROTOBUF_INCLUDE NAMES google/protobuf/message.h)
  find_library(PROTOBUF_LIB NAMES libprotobuf.so)
@@ -43,6 +45,7 @@ if(NOT USE_BUNDLED_DEPS)
  endif()

  # gpr
+  mark_as_advanced(GPR_LIB)
  find_library(GPR_LIB NAMES gpr)

  if(GPR_LIB)
@@ -52,12 +55,16 @@ if(NOT USE_BUNDLED_DEPS)
  endif()

  # gRPC todo(fntlnz, leodido): check that gRPC version is greater or equal than 1.8.0
+  mark_as_advanced(GRPC_INCLUDE GRPC_SRC
+    GRPC_LIB GRPC_LIBS_ABSOLUTE  GRPCPP_LIB GRPC_CPP_PLUGIN)
  find_path(GRPCXX_INCLUDE NAMES grpc++/grpc++.h)
  if(GRPCXX_INCLUDE)
    set(GRPC_INCLUDE ${GRPCXX_INCLUDE})
+    unset(GRPCXX_INCLUDE CACHE)
  else()
    find_path(GRPCPP_INCLUDE NAMES grpcpp/grpcpp.h)
    set(GRPC_INCLUDE ${GRPCPP_INCLUDE})
+    unset(GRPCPP_INCLUDE CACHE)
    add_definitions(-DGRPC_INCLUDE_IS_GRPCPP=1)
  endif()
  find_library(GRPC_LIB NAMES grpc)
--- a/cmake/modules/jq.cmake
+++ b/cmake/modules/jq.cmake
@@ -10,6 +10,7 @@
 # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 # specific language governing permissions and limitations under the License.
 #
+mark_as_advanced(JQ_INCLUDE JQ_LIB)
 if (NOT USE_BUNDLED_DEPS)
    find_path(JQ_INCLUDE jq.h PATH_SUFFIXES jq)
    find_library(JQ_LIB NAMES jq)
--- a/cmake/modules/static-analysis.cmake
+++ b/cmake/modules/static-analysis.cmake
@@ -3,6 +3,7 @@ file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/static-analysis-reports)
 file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/static-analysis-reports/cppcheck)

 # cppcheck
+mark_as_advanced(CPPCHECK CPPCHECK_HTMLREPORT)
 find_program(CPPCHECK cppcheck)
 find_program(CPPCHECK_HTMLREPORT cppcheck-htmlreport)

--- a/cmake/modules/sysdig-repo/patch/libscap.patch
+++ b/cmake/modules/sysdig-repo/patch/libscap.patch
@@ -38,17 +38,6 @@ index 6f51588e..5f9ea84e 100644
 				}
 				else
 				{
-@@ -579,8 +579,8 @@ scap_t* scap_open_udig_int(char *error, int32_t *rc,
- 	//
- 	// Map the ppm_ring_buffer_info that contains the buffer pointers
- 	//
-	if(udig_alloc_ring_descriptors(&(handle->m_devs[0].m_bufinfo_fd), 
-		&handle->m_devs[0].m_bufinfo, 
-+	if(udig_alloc_ring_descriptors(&(handle->m_devs[0].m_bufinfo_fd),
-+		&handle->m_devs[0].m_bufinfo,
- 		&handle->m_devs[0].m_bufstatus,
- 		error) != SCAP_SUCCESS)
- 	{
@@ -2175,7 +2175,7 @@ int32_t scap_disable_dynamic_snaplen(scap_t* handle)
 
 const char* scap_get_host_root()
--- a/cmake/modules/yaml-cpp.cmake
+++ b/cmake/modules/yaml-cpp.cmake
@@ -10,6 +10,7 @@
 # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 # specific language governing permissions and limitations under the License.
 #
+mark_as_advanced(YAMLCPP_INCLUDE_DIR YAMLCPP_LIB)
 if(NOT USE_BUNDLED_DEPS)
  find_path(YAMLCPP_INCLUDE_DIR NAMES yaml-cpp/yaml.h)
  find_library(YAMLCPP_LIB NAMES yaml-cpp)
--- a/falco.yaml
+++ b/falco.yaml
@@ -28,10 +28,7 @@
 # The files will be read in the order presented here, so make sure if
 # you have overrides they appear in later files.
 rules_file:
-  - /etc/falco/falco_rules.yaml
-  - /etc/falco/falco_rules.local.yaml
-  - /etc/falco/k8s_audit_rules.yaml
-  - /etc/falco/rules.d
+  - /tmp/falco

 # If true, the times displayed in log messages and output messages
 # will be in ISO 8601. By default, times are displayed in the local
@@ -218,3 +215,14 @@ grpc:
 # Make sure to have a consumer for them or leave this disabled.
 grpc_output:
  enabled: false
+
+# todo(fntlnz): provide a default implementation
+# so that users can avoid to input this configuration
+# if they don't need to change the default Falco behavior
+#extensions:
+#  - myextension.so
+
+# Rules provider
+# Specify a non-default provider.
+# Default value is "internal"
+rules_provider: internal
--- a/proposals/20200828-structured-exception-handling.md
+++ b/proposals/20200828-structured-exception-handling.md
@@ -0,0 +1,240 @@
+# Proposal for First Class Structured Exceptions in Falco Rules
+
+## Summary
+
+## Motivation
+
+Almost all Falco Rules have cases where the behavior detected by the
+rule should be allowed. For example, The rule Write Below Binary Dir
+has exceptions for specific programs that are known to write below
+these directories as a part of software installation/management:
+
+```yaml
+- rule: Write below binary dir
+  desc: an attempt to write to any file below a set of binary directories
+  condition: >
+    bin_dir and evt.dir = < and open_write
+    and not package_mgmt_procs
+    and not exe_running_docker_save
+    and not python_running_get_pip
+    and not python_running_ms_oms
+    and not user_known_write_below_binary_dir_activities
+...
+```
+In most cases, these exceptions are expressed as concatenations to the original rule's condition. For example, looking at the macro package_mgmt_procs:
+
+```yaml
+- macro: package_mgmt_procs
+  condition: proc.name in (package_mgmt_binaries)
+```
+
+The result is appending `and not proc.name in (package_mgmt_binaries)` to the condition of the rule.
+
+A more extreme case of this is the write_below_etc macro used by Write below etc rule. It has tens of exceptions:
+
+```
+...
+    and not sed_temporary_file
+    and not exe_running_docker_save
+    and not ansible_running_python
+    and not python_running_denyhosts
+    and not fluentd_writing_conf_files
+    and not user_known_write_etc_conditions
+    and not run_by_centrify
+    and not run_by_adclient
+    and not qualys_writing_conf_files
+    and not git_writing_nssdb
+...
+```
+
+The exceptions all generally follow the same structure--naming a program and a directory prefix below /etc where that program is allowed to write files.
+
+### Using Appends/Overwrites to Customize Rules
+
+An important way to customize rules and macros is to use `append: true` to add to them, or `append: false` to define a new rule/macro, overwriting the original rule/macro. Here's an example from Update Package Repository:
+
+```yaml
+- list: package_mgmt_binaries
+  items: [rpm_binaries, deb_binaries, update-alternat, gem, pip, pip3, sane-utils.post, alternatives, chef-client, apk, snapd]
+
+- macro: package_mgmt_procs
+  condition: proc.name in (package_mgmt_binaries)
+
+- macro: user_known_update_package_registry
+  condition: (never_true)
+
+- rule: Update Package Repository
+  desc: Detect package repositories get updated
+  condition: >
+    ((open_write and access_repositories) or (modify and modify_repositories))
+    and not package_mgmt_procs
+    and not exe_running_docker_save
+    and not user_known_update_package_registry
+```
+
+If someone wanted to add additional exceptions to this rule, they could add the following to the user_rules file:
+
+```yaml
+- list: package_mgmt_binaries
+  items: [puppet]
+  append: true
+
+- macro: package_mgmt_procs
+  condition: and not proc.pname=chef
+  append: true
+
+- macro: user_known_update_package_registry
+  condition: (proc.name in (npm))
+  append: false
+```
+
+This adds an 3 different exceptions:
+* an additional binary to package_mgmt_binaries (because append is true),
+* adds to package_mgmt_procs, adding an exception for programs spawned by chef (because append is true)
+* overrides the macro user_known_update_package_registry to add an exception for npm (because append is false).
+
+### Problems with Appends/Overrides to Define Exceptions
+
+Although the concepts of macros and lists in condition fields, combined with appending to lists/conditions in macros/rules, is very general purpose, it can be unwieldy:
+
+* Appending to conditions can result in incorrect behavior, unless the original condition has its logical operators set up properly with parentheses. For example:
+
+```yaml
+rule: my_rule
+condition: (evt.type=open and (fd.name=/tmp/foo or fd.name=/tmp/bar))
+
+rule: my_rule
+condition: or fd.name=/tmp/baz
+append: true
+```
+
+Results in unintended behavior. It will match any fd related event where the name is /tmp/baz, when the intent was probably to add /tmp/baz as an additional opened file.
+
+* A good convention many rules use is to have a clause "and not user_known_xxxx" built into the condition field. However, it's not in all rules and its use is a bit haphazard.
+
+* Appends and overrides can get confusing if you try to apply them multiple times. For example:
+
+```yaml
+macro: allowed_files
+condition: fd.name=/tmp/foo
+
+...
+
+macro: allowed_files
+condition: and fd.name=/tmp/bar
+append: true
+```
+
+If someone wanted to override the original behavior of allowed_files, they would have to use `append: false` in a third definition of allowed_files, but this would result in losing the append: true override.
+
+## Solution: Exceptions as first class objects
+
+To address some of these problems, we will add the notion of Exceptions as top level objects alongside Rules, Macros, and Lists. A rule that supports exceptions must define a new key `exceptions` in the rule. The exceptions key is a list of identifier plus list of tuples of filtercheck fields. Here's an example:
+
+```yaml
+- rule: Write below binary dir
+  desc: an attempt to write to any file below a set of binary directories
+  condition: >
+    bin_dir and evt.dir = < and open_write
+    and not package_mgmt_procs
+    and not exe_running_docker_save
+    and not python_running_get_pip
+    and not python_running_ms_oms
+    and not user_known_write_below_binary_dir_activities
+  exceptions:
+   - name: proc_writer
+     fields: [proc.name, fd.directory]
+   - name: container_writer
+     fields: [container.image.repository, fd.directory]
+     comps: [=, startswith]
+   - name: proc_filenames
+     fields: [proc.name, fd.name]
+     comps: [=, in]
+   - name: filenames
+     fields: fd.filename
+     comps: in
+```
+
+This rule defines four kinds of exceptions:
+  * proc_writer: uses a combination of proc.name and fd.directory
+  * container_writer: uses a combination of container.image.repository and fd.directory
+  * proc_filenames: uses a combination of process and list of filenames.
+  * filenames: uses a list of filenames
+
+The specific strings "proc_writer"/"container_writer"/"proc_filenames"/"filenames" are arbitrary strings and don't have a special meaning to the rules file parser. They're only used to link together the list of field names with the list of field values that exist in the exception object.
+
+proc_writer does not have any comps property, so the fields are directly compared to values using the = operator. container_writer does have a comps property, so each field will be compared to the corresponding exception items using the corresponding comparison operator.
+
+proc_filenames uses the in comparison operator, so the corresponding values entry should be a list of filenames.
+
+filenames differs from the others in that it names a single field and single comp operator. This changes how the exception condition snippet is constructed (see below).
+
+Notice that exceptions are defined as a part of the rule. This is important because the author of the rule defines what construes a valid exception to the rule. In this case, an exception can consist of a process and file directory (actor and target), but not a process name only (too broad).
+
+Exception values will most commonly be defined in rules with append: true. Here's an example:
+
+```yaml
+- list: apt_files
+  items: [/bin/ls, /bin/rm]
+
+- rule: Write below binary dir
+  exceptions:
+  - name: proc_writer
+    values:
+    - [apk, /usr/lib/alpine]
+    - [npm, /usr/node/bin]
+  - name: container_writer
+    values:
+    - [docker.io/alpine, /usr/libexec/alpine]
+  - name: proc_filenames
+    values:
+    - [apt, apt_files]
+    - [rpm, [/bin/cp, /bin/pwd]]
+  - name: filenames
+    values: [python, go]
+```
+
+A rule exception applies if for a given event, the fields in a rule.exception match all of the values in some exception.item. For example, if a program `apk` writes to a file below `/usr/lib/alpine`, the rule will not trigger, even if the condition is met.
+
+Notice that an item in a values list can be a list. This allows building exceptions with operators like "in", "pmatch", etc. that work on a list of items. The item can also be a name of an existing list. If not present surrounding parantheses will be added.
+
+Finally, note that the structure of the values property differs between the items where fields is a list of fields (proc_writer/container_writer/proc_filenames) and when it is a single field (procs_only). This changes how the condition snippet is constructed.
+
+### Implementation
+
+For exception items where the fields property is a list of field names, each exception can be thought of as an implicit "and not (field1 cmp1 val1 and field2 cmp2 val2 and...)" appended to the rule's condition. For exception items where the fields property is a single field name, the exception can be thought of as an implict "and not field cmp (val1, val2, ...)". In practice, that's how exceptions will be implemented.
+
+When a rule is parsed, the original condition will be wrapped in an extra layer of parentheses and all exception values will be appended to the condition. For example, using the example above, the resulting condition will be:
+
+```
+(<Write below binary dir condition>) and not (
+    (proc.name = apk and fd.directory = /usr/lib/alpine) or (proc.name = npm and fd.directory = /usr/node/bin) or
+	(container.image.repository = docker.io/alpine and fd.directory startswith /usr/libexec/alpine) or
+	(proc.name=apt and fd.name in (apt_files))) or
+	(fd.filename in (python, go))))
+```
+
+The exceptions are effectively syntatic sugar that allows expressing sets of exceptions in a concise way.
+
+### Advantages
+
+Adding Exception objects as described here has several advantages:
+
+* All rules will implicitly support exceptions. A rule writer doesn't need to define a user_known_xxx macro and add it to the condition.
+* The rule writer has some controls on what defines a valid exception. The rule author knows best what is a good exception, and can define the fields that make up the exception.
+* With this approach, it's much easier to add and manage multiple sets of exceptions from multiple sources. You're just combining lists of tuples of filtercheck field values.
+
+## Backwards compatibility
+
+To take advantage of these new features, users will need to upgrade Falco to a version that supports exception objects and exception keys in rules. For the most part, however, the rules file structure is unchanged.
+
+This approach does not remove the ability to append to exceptions nor the existing use of user_xxx macros to define exceptions to rules. It only provides an additional way to express exceptions. Hopefully, we can migrate existing exceptions to use this approach, but there isn't any plan to make wholesale rules changes as a part of this.
+
+This approach is for the most part backwards compatible with older Falco releases. To implement exceptions, we'll add a preprocessing element to rule parsing. The main Falco engine is unchanged.
+
+However, there are a few changes we'll have to make to Falco rules file parsing:
+
+* Currently, Falco will reject files containing anything other than rule/macro/list top-level objects. As a result, `exception` objects would be rejected. We'll probably want to make a one-time change to Falco to allow arbitrary top level objects.
+* Similarly, Falco will reject rule objects with exception keys. We'll also probably want to change Falco to allow unknown keys inside rule/macro/list/exception objects.
+
+
--- a/rules/falco_rules.yaml
+++ b/rules/falco_rules.yaml
--- a/rules/k8s_audit_rules.yaml
+++ b/rules/k8s_audit_rules.yaml
@@ -14,7 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
- required_engine_version: 2
+- required_engine_version: 8

 # Like always_true/always_false, but works with k8s audit events
 - macro: k8s_audit_always_true
@@ -55,7 +55,12 @@

 - rule: Disallowed K8s User
  desc: Detect any k8s operation by users outside of an allowed set of users.
-  condition: kevt and non_system_user and not ka.user.name in (allowed_k8s_users)
+  condition: kevt and non_system_user
+  exceptions:
+    - name: user_names
+      fields: ka.user.name
+      comps: in
+      values: [allowed_k8s_users]
  output: K8s Operation performed by user not in allowed list of users (user=%ka.user.name target=%ka.target.name/%ka.target.resource verb=%ka.verb uri=%ka.uri resp=%ka.response.code)
  priority: WARNING
  source: k8s_audit
@@ -122,6 +127,10 @@
  desc: >
    Detect an attempt to start a pod with a container image outside of a list of allowed images.
  condition: kevt and pod and kcreate and not allowed_k8s_containers
+  exceptions:
+    - name: image_repos
+      fields: ka.req.pod.containers.image.repository
+      comps: in
  output: Pod started with container not in allowed list (user=%ka.user.name pod=%ka.resp.name ns=%ka.target.namespace images=%ka.req.pod.containers.image)
  priority: WARNING
  source: k8s_audit
@@ -130,7 +139,12 @@
 - rule: Create Privileged Pod
  desc: >
    Detect an attempt to start a pod with a privileged container
-  condition: kevt and pod and kcreate and ka.req.pod.containers.privileged intersects (true) and not ka.req.pod.containers.image.repository in (falco_privileged_images)
+  condition: kevt and pod and kcreate and ka.req.pod.containers.privileged intersects (true)
+  exceptions:
+    - name: image_repos
+      fields: ka.req.pod.containers.image.repository
+      comps: in
+      values: [falco_privileged_images]
  output: Pod started with privileged container (user=%ka.user.name pod=%ka.resp.name ns=%ka.target.namespace images=%ka.req.pod.containers.image)
  priority: WARNING
  source: k8s_audit
@@ -144,7 +158,12 @@
  desc: >
    Detect an attempt to start a pod with a volume from a sensitive host directory (i.e. /proc).
    Exceptions are made for known trusted images.
-  condition: kevt and pod and kcreate and sensitive_vol_mount and not ka.req.pod.containers.image.repository in (falco_sensitive_mount_images)
+  condition: kevt and pod and kcreate and sensitive_vol_mount
+  exceptions:
+    - name: image_repos
+      fields: ka.req.pod.containers.image.repository
+      comps: in
+      values: [falco_sensitive_mount_images]
  output: Pod started with sensitive mount (user=%ka.user.name pod=%ka.resp.name ns=%ka.target.namespace images=%ka.req.pod.containers.image volumes=%jevt.value[/requestObject/spec/volumes])
  priority: WARNING
  source: k8s_audit
@@ -153,7 +172,12 @@
 # Corresponds to K8s CIS Benchmark 1.7.4
 - rule: Create HostNetwork Pod
  desc: Detect an attempt to start a pod using the host network.
-  condition: kevt and pod and kcreate and ka.req.pod.host_network intersects (true) and not ka.req.pod.containers.image.repository in (falco_hostnetwork_images)
+  condition: kevt and pod and kcreate and ka.req.pod.host_network intersects (true)
+  exceptions:
+    - name: image_repos
+      fields: ka.req.pod.containers.image.repository
+      comps: in
+      values: [falco_hostnetwork_images]
  output: Pod started using host network (user=%ka.user.name pod=%ka.resp.name ns=%ka.target.namespace images=%ka.req.pod.containers.image)
  priority: WARNING
  source: k8s_audit
@@ -166,6 +190,9 @@
  desc: >
    Detect an attempt to start a service with a NodePort service type
  condition: kevt and service and kcreate and ka.req.service.type=NodePort and not user_known_node_port_service
+  exceptions:
+    - name: services
+      fields: [ka.target.namespace, ka.target.name]
  output: NodePort Service Created (user=%ka.user.name service=%ka.target.name ns=%ka.target.namespace ports=%ka.req.service.ports)
  priority: WARNING
  source: k8s_audit
@@ -184,6 +211,9 @@
  desc: >
     Detect creating/modifying a configmap containing a private credential (aws key, password, etc.)
  condition: kevt and configmap and kmodify and contains_private_credentials
+  exceptions:
+    - name: configmaps
+      fields: [ka.target.namespace, ka.req.configmap.name]
  output: K8s configmap with private credential (user=%ka.user.name verb=%ka.verb configmap=%ka.req.configmap.name config=%ka.req.configmap.obj)
  priority: WARNING
  source: k8s_audit
@@ -194,6 +224,10 @@
  desc: >
    Detect any request made by the anonymous user that was allowed
  condition: kevt and ka.user.name=system:anonymous and ka.auth.decision="allow" and not health_endpoint
+  exceptions:
+    - name: user_names
+      fields: ka.user.name
+      comps: in
  output: Request by anonymous user allowed (user=%ka.user.name verb=%ka.verb uri=%ka.uri reason=%ka.auth.reason))
  priority: WARNING
  source: k8s_audit
@@ -207,6 +241,10 @@
 # events to be stateful, so it could know if a container named in an
 # attach request was created privileged or not. For now, we have a
 # less severe rule that detects attaches/execs to any pod.
+#
+# For the same reason, you can't use things like image names/prefixes,
+# as the event that creates the pod (which has the images) is a
+# separate event than the actual exec/attach to the pod.

 - macro: user_known_exec_pod_activities
  condition: (k8s_audit_never_true)
@@ -215,6 +253,10 @@
  desc: >
    Detect any attempt to attach/exec to a pod
  condition: kevt_started and pod_subresource and kcreate and ka.target.subresource in (exec,attach) and not user_known_exec_pod_activities
+  exceptions:
+    - name: user_names
+      fields: ka.user.name
+      comps: in
  output: Attach/Exec to pod (user=%ka.user.name pod=%ka.target.name ns=%ka.target.namespace action=%ka.target.subresource command=%ka.uri.param[command])
  priority: NOTICE
  source: k8s_audit
@@ -224,10 +266,14 @@
  condition: (k8s_audit_never_true)

 # Only works when feature gate EphemeralContainers is enabled
+# Definining empty exceptions just to avoid warnings. There isn't any
+#  great exception for this kind of object, as you'd expect the images
+#  to vary wildly.
 - rule: EphemeralContainers Created
  desc: >
    Detect any ephemeral container created
  condition: kevt and pod_subresource and kmodify and ka.target.subresource in (ephemeralcontainers) and not user_known_pod_debug_activities
+  exceptions:
  output: Ephemeral container is created in pod (user=%ka.user.name pod=%ka.target.name ns=%ka.target.namespace ephemeral_container_name=%jevt.value[/requestObject/ephemeralContainers/0/name] ephemeral_container_image=%jevt.value[/requestObject/ephemeralContainers/0/image])
  priority: NOTICE
  source: k8s_audit
@@ -239,7 +285,12 @@

 - rule: Create Disallowed Namespace
  desc: Detect any attempt to create a namespace outside of a set of known namespaces
-  condition: kevt and namespace and kcreate and not ka.target.name in (allowed_namespaces)
+  condition: kevt and namespace and kcreate
+  exceptions:
+    - name: services
+      fields: ka.target.name
+      comps: in
+      values: [allowed_namespaces]
  output: Disallowed namespace created (user=%ka.user.name ns=%ka.target.name)
  priority: WARNING
  source: k8s_audit
@@ -279,15 +330,16 @@
    k8s_image_list
    ]

- macro: allowed_kube_namespace_pods
-  condition: (ka.req.pod.containers.image.repository in (user_allowed_kube_namespace_image_list) or
-              ka.req.pod.containers.image.repository in (allowed_kube_namespace_image_list))
-
 # Detect any new pod created in the kube-system namespace
 - rule: Pod Created in Kube Namespace
  desc: Detect any attempt to create a pod in the kube-system or kube-public namespaces
-  condition: kevt and pod and kcreate and ka.target.namespace in (kube-system, kube-public) and not allowed_kube_namespace_pods
+  condition: kevt and pod and kcreate and ka.target.namespace in (kube-system, kube-public)
  output: Pod created in kube namespace (user=%ka.user.name pod=%ka.resp.name ns=%ka.target.namespace images=%ka.req.pod.containers.image)
+  exceptions:
+    - name: images
+      fields: ka.req.pod.containers.image.repository
+      comps: in
+      values: [user_allowed_kube_namespace_image_list, allowed_kube_namespace_image_list]
  priority: WARNING
  source: k8s_audit
  tags: [k8s]
@@ -302,6 +354,9 @@
 - rule: Service Account Created in Kube Namespace
  desc: Detect any attempt to create a serviceaccount in the kube-system or kube-public namespaces
  condition: kevt and serviceaccount and kcreate and ka.target.namespace in (kube-system, kube-public) and response_successful and not trusted_sa
+  exceptions:
+    - name: accounts
+      fields: [ka.target.namespace, ka.target.name]
  output: Service account created in kube namespace (user=%ka.user.name serviceaccount=%ka.target.name ns=%ka.target.namespace)
  priority: WARNING
  source: k8s_audit
@@ -314,6 +369,9 @@
  desc: Detect any attempt to modify/delete a ClusterRole/Role starting with system
  condition: kevt and (role or clusterrole) and (kmodify or kdelete) and (ka.target.name startswith "system:") and
             not ka.target.name in (system:coredns, system:managed-certificate-controller)
+  exceptions:
+    - name: roles
+      fields: [ka.target.namespace, ka.target.name]
  output: System ClusterRole/Role modified or deleted (user=%ka.user.name role=%ka.target.name ns=%ka.target.namespace action=%ka.verb)
  priority: WARNING
  source: k8s_audit
@@ -324,6 +382,10 @@
 - rule: Attach to cluster-admin Role
  desc: Detect any attempt to create a ClusterRoleBinding to the cluster-admin user
  condition: kevt and clusterrolebinding and kcreate and ka.req.binding.role=cluster-admin
+  exceptions:
+    - name: subjects
+      fields: ka.req.binding.subjects
+      comps: in
  output: Cluster Role Binding to cluster-admin role (user=%ka.user.name subject=%ka.req.binding.subjects)
  priority: WARNING
  source: k8s_audit
@@ -332,6 +394,10 @@
 - rule: ClusterRole With Wildcard Created
  desc: Detect any attempt to create a Role/ClusterRole with wildcard resources or verbs
  condition: kevt and (role or clusterrole) and kcreate and (ka.req.role.rules.resources intersects ("*") or ka.req.role.rules.verbs intersects ("*"))
+  exceptions:
+    - name: roles
+      fields: ka.target.name
+      comps: in
  output: Created Role/ClusterRole with wildcard (user=%ka.user.name role=%ka.target.name rules=%ka.req.role.rules)
  priority: WARNING
  source: k8s_audit
@@ -344,6 +410,10 @@
 - rule: ClusterRole With Write Privileges Created
  desc: Detect any attempt to create a Role/ClusterRole that can perform write-related actions
  condition: kevt and (role or clusterrole) and kcreate and writable_verbs
+  exceptions:
+    - name: roles
+      fields: ka.target.name
+      comps: in
  output: Created Role/ClusterRole with write privileges (user=%ka.user.name role=%ka.target.name rules=%ka.req.role.rules)
  priority: NOTICE
  source: k8s_audit
@@ -352,6 +422,10 @@
 - rule: ClusterRole With Pod Exec Created
  desc: Detect any attempt to create a Role/ClusterRole that can exec to pods
  condition: kevt and (role or clusterrole) and kcreate and ka.req.role.rules.resources intersects ("pods/exec")
+  exceptions:
+    - name: roles
+      fields: ka.target.name
+      comps: in
  output: Created Role/ClusterRole with pod exec privileges (user=%ka.user.name role=%ka.target.name rules=%ka.req.role.rules)
  priority: WARNING
  source: k8s_audit
@@ -363,12 +437,16 @@
 - macro: consider_activity_events
  condition: (k8s_audit_always_true)

+# Activity events don't have exceptions. They do define an empty
+# exceptions property just to avoid warnings when loading rules.
+
 - macro: kactivity
  condition: (kevt and consider_activity_events)

 - rule: K8s Deployment Created
  desc: Detect any attempt to create a deployment
  condition: (kactivity and kcreate and deployment and response_successful)
+  exceptions:
  output: K8s Deployment Created (user=%ka.user.name deployment=%ka.target.name ns=%ka.target.namespace resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -377,6 +455,7 @@
 - rule: K8s Deployment Deleted
  desc: Detect any attempt to delete a deployment
  condition: (kactivity and kdelete and deployment and response_successful)
+  exceptions:
  output: K8s Deployment Deleted (user=%ka.user.name deployment=%ka.target.name ns=%ka.target.namespace resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -385,6 +464,7 @@
 - rule: K8s Service Created
  desc: Detect any attempt to create a service
  condition: (kactivity and kcreate and service and response_successful)
+  exceptions:
  output: K8s Service Created (user=%ka.user.name service=%ka.target.name ns=%ka.target.namespace resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -393,6 +473,7 @@
 - rule: K8s Service Deleted
  desc: Detect any attempt to delete a service
  condition: (kactivity and kdelete and service and response_successful)
+  exceptions:
  output: K8s Service Deleted (user=%ka.user.name service=%ka.target.name ns=%ka.target.namespace resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -401,6 +482,7 @@
 - rule: K8s ConfigMap Created
  desc: Detect any attempt to create a configmap
  condition: (kactivity and kcreate and configmap and response_successful)
+  exceptions:
  output: K8s ConfigMap Created (user=%ka.user.name configmap=%ka.target.name ns=%ka.target.namespace resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -409,6 +491,7 @@
 - rule: K8s ConfigMap Deleted
  desc: Detect any attempt to delete a configmap
  condition: (kactivity and kdelete and configmap and response_successful)
+  exceptions:
  output: K8s ConfigMap Deleted (user=%ka.user.name configmap=%ka.target.name ns=%ka.target.namespace resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -417,6 +500,7 @@
 - rule: K8s Namespace Created
  desc: Detect any attempt to create a namespace
  condition: (kactivity and kcreate and namespace and response_successful)
+  exceptions:
  output: K8s Namespace Created (user=%ka.user.name namespace=%ka.target.name resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -425,6 +509,7 @@
 - rule: K8s Namespace Deleted
  desc: Detect any attempt to delete a namespace
  condition: (kactivity and non_system_user and kdelete and namespace and response_successful)
+  exceptions:
  output: K8s Namespace Deleted (user=%ka.user.name namespace=%ka.target.name resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -433,6 +518,7 @@
 - rule: K8s Serviceaccount Created
  desc: Detect any attempt to create a service account
  condition: (kactivity and kcreate and serviceaccount and response_successful)
+  exceptions:
  output: K8s Serviceaccount Created (user=%ka.user.name user=%ka.target.name ns=%ka.target.namespace resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -441,6 +527,7 @@
 - rule: K8s Serviceaccount Deleted
  desc: Detect any attempt to delete a service account
  condition: (kactivity and kdelete and serviceaccount and response_successful)
+  exceptions:
  output: K8s Serviceaccount Deleted (user=%ka.user.name user=%ka.target.name ns=%ka.target.namespace resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -449,6 +536,7 @@
 - rule: K8s Role/Clusterrole Created
  desc: Detect any attempt to create a cluster role/role
  condition: (kactivity and kcreate and (clusterrole or role) and response_successful)
+  exceptions:
  output: K8s Cluster Role Created (user=%ka.user.name role=%ka.target.name rules=%ka.req.role.rules resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -457,6 +545,7 @@
 - rule: K8s Role/Clusterrole Deleted
  desc: Detect any attempt to delete a cluster role/role
  condition: (kactivity and kdelete and (clusterrole or role) and response_successful)
+  exceptions:
  output: K8s Cluster Role Deleted (user=%ka.user.name role=%ka.target.name resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -465,6 +554,7 @@
 - rule: K8s Role/Clusterrolebinding Created
  desc: Detect any attempt to create a clusterrolebinding
  condition: (kactivity and kcreate and clusterrolebinding and response_successful)
+  exceptions:
  output: K8s Cluster Role Binding Created (user=%ka.user.name binding=%ka.target.name subjects=%ka.req.binding.subjects role=%ka.req.binding.role resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -473,6 +563,7 @@
 - rule: K8s Role/Clusterrolebinding Deleted
  desc: Detect any attempt to delete a clusterrolebinding
  condition: (kactivity and kdelete and clusterrolebinding and response_successful)
+  exceptions:
  output: K8s Cluster Role Binding Deleted (user=%ka.user.name binding=%ka.target.name resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -481,6 +572,7 @@
 - rule: K8s Secret Created
  desc: Detect any attempt to create a secret. Service account tokens are excluded.
  condition: (kactivity and kcreate and secret and ka.target.namespace!=kube-system and non_system_user and response_successful)
+  exceptions:
  output: K8s Secret Created (user=%ka.user.name secret=%ka.target.name ns=%ka.target.namespace resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -489,6 +581,7 @@
 - rule: K8s Secret Deleted
  desc: Detect any attempt to delete a secret Service account tokens are excluded.
  condition: (kactivity and kdelete and secret and ka.target.namespace!=kube-system and non_system_user and response_successful)
+  exceptions:
  output: K8s Secret Deleted (user=%ka.user.name secret=%ka.target.name ns=%ka.target.namespace resp=%ka.response.code decision=%ka.auth.decision reason=%ka.auth.reason)
  priority: INFO
  source: k8s_audit
@@ -507,6 +600,7 @@
 - rule: All K8s Audit Events
  desc: Match all K8s Audit Events
  condition: kall
+  exceptions:
  output: K8s Audit Event received (user=%ka.user.name verb=%ka.verb uri=%ka.uri obj=%jevt.obj)
  priority: DEBUG
  source: k8s_audit
@@ -521,11 +615,11 @@
 - list: full_admin_k8s_users
  items: ["admin", "kubernetes-admin",  "kubernetes-admin@kubernetes", "kubernetes-admin@cluster.local", "minikube-user"]

-# This rules detect an operation triggered by an user name that is 
-# included in the list of those that are default administrators upon 
-# cluster creation. This may signify a permission setting too broader. 
-# As we can't check for role of the user on a general ka.* event, this 
-# may or may not be an administrator. Customize the full_admin_k8s_users 
+# This rules detect an operation triggered by an user name that is
+# included in the list of those that are default administrators upon
+# cluster creation. This may signify a permission setting too broader.
+# As we can't check for role of the user on a general ka.* event, this
+# may or may not be an administrator. Customize the full_admin_k8s_users
 # list to your needs, and activate at your discrection.

 # # How to test:
@@ -535,10 +629,14 @@
 - rule: Full K8s Administrative Access
  desc: Detect any k8s operation by a user name that may be an administrator with full access.
  condition: >
-    kevt 
-    and non_system_user 
+    kevt
+    and non_system_user
    and ka.user.name in (full_admin_k8s_users)
    and not allowed_full_admin_users
+  exceptions:
+    - name: user_names
+      fields: ka.user.name
+      comps: in
  output: K8s Operation performed by full admin user (user=%ka.user.name target=%ka.target.name/%ka.target.resource verb=%ka.verb uri=%ka.uri resp=%ka.response.code)
  priority: WARNING
  source: k8s_audit
@@ -572,10 +670,13 @@
  desc: Detect any attempt to create an ingress without TLS certification.
  condition: >
    (kactivity and kcreate and ingress and response_successful and not ingress_tls)
+  exceptions:
+    - name: ingresses
+      fields: [ka.target.namespace, ka.target.name]
  output: >
    K8s Ingress Without TLS Cert Created (user=%ka.user.name ingress=%ka.target.name
    namespace=%ka.target.namespace)
-  source: k8s_audit    
+  source: k8s_audit
  priority: WARNING
  tags: [k8s, network]

@@ -598,11 +699,15 @@
  desc: >
    Detect a node successfully joined the cluster outside of the list of allowed nodes.
  condition: >
-    kevt and node 
-    and kcreate 
-    and response_successful 
-    and not allow_all_k8s_nodes 
-    and not ka.target.name in (allowed_k8s_nodes)
+    kevt and node
+    and kcreate
+    and response_successful
+    and not allow_all_k8s_nodes
+  exceptions:
+    - name: nodes
+      fields: ka.target.name
+      comps: in
+      values: [allowed_k8s_nodes]
  output: Node not in allowed list successfully joined the cluster (user=%ka.user.name node=%ka.target.name)
  priority: ERROR
  source: k8s_audit
@@ -612,11 +717,15 @@
  desc: >
    Detect an unsuccessful attempt to join the cluster for a node not in the list of allowed nodes.
  condition: >
-    kevt and node 
-    and kcreate 
-    and not response_successful 
-    and not allow_all_k8s_nodes 
-    and not ka.target.name in (allowed_k8s_nodes)
+    kevt and node
+    and kcreate
+    and not response_successful
+    and not allow_all_k8s_nodes
+  exceptions:
+    - name: nodes
+      fields: ka.target.name
+      comps: in
+      values: [allowed_k8s_nodes]
  output: Node not in allowed list tried unsuccessfully to join the cluster  (user=%ka.user.name node=%ka.target.name reason=%ka.response.reason)
  priority: WARNING
  source: k8s_audit
--- a/test/falco_test.py
+++ b/test/falco_test.py
@@ -675,7 +675,8 @@ class FalcoTest(Test):
        self.check_rules_warnings(res)
        if len(self.rules_events) > 0:
            self.check_rules_events(res)
-        self.check_detections(res)
+        if len(self.validate_rules_file) == 0:
+            self.check_detections(res)
        if len(self.detect_counts) > 0:
            self.check_detections_by_rule(res)
        self.check_json_output(res)
--- a/test/falco_tests.yaml
+++ b/test/falco_tests.yaml
@@ -262,6 +262,7 @@ trace_files: !mux
  invalid_not_yaml:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      Rules content is not yaml
      ---
      This is not yaml
@@ -273,6 +274,7 @@ trace_files: !mux
  invalid_not_array:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      Rules content is not yaml array of objects
      ---
      foo: bar
@@ -284,6 +286,7 @@ trace_files: !mux
  invalid_array_item_not_object:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      Unexpected element of type string. Each element should be a yaml associative array.
      ---
      - foo
@@ -292,20 +295,10 @@ trace_files: !mux
      - rules/invalid_array_item_not_object.yaml
    trace_file: trace_files/cat_write.scap

-  invalid_unexpected object:
-    exit_status: 1
-    stdout_is: |+
-      Unknown rule object: {foo="bar"}
-      ---
-      - foo: bar
-      ---
-    validate_rules_file:
-      - rules/invalid_unexpected_object.yaml
-    trace_file: trace_files/cat_write.scap
-
  invalid_engine_version_not_number:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      Value of required_engine_version must be a number
      ---
      - required_engine_version: not-a-number
@@ -317,6 +310,7 @@ trace_files: !mux
  invalid_yaml_parse_error:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      mapping values are not allowed in this context
      ---
      this : is : not : yaml
@@ -328,6 +322,7 @@ trace_files: !mux
  invalid_list_without_items:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      List must have property items
      ---
      - list: bad_list
@@ -340,6 +335,7 @@ trace_files: !mux
  invalid_macro_without_condition:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      Macro must have property condition
      ---
      - macro: bad_macro
@@ -352,6 +348,7 @@ trace_files: !mux
  invalid_rule_without_output:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      Rule must have property output
      ---
      - rule: no output rule
@@ -359,6 +356,8 @@ trace_files: !mux
        condition: evt.type=fork
        priority: INFO
      ---
+      1 warnings:
+      Rule no output rule: consider adding an exceptions property to define supported exceptions fields
    validate_rules_file:
      - rules/invalid_rule_without_output.yaml
    trace_file: trace_files/cat_write.scap
@@ -366,7 +365,8 @@ trace_files: !mux
  invalid_append_rule_without_condition:
    exit_status: 1
    stdout_is: |+
-      Rule must have property condition
+      1 errors:
+      Rule must have exceptions or condition property
      ---
      - rule: no condition rule
        append: true
@@ -378,6 +378,7 @@ trace_files: !mux
  invalid_append_macro_dangling:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      Macro dangling append has 'append' key but no macro by that name already exists
      ---
      - macro: dangling append
@@ -391,6 +392,7 @@ trace_files: !mux
  invalid_list_append_dangling:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      List my_list has 'append' key but no list by that name already exists
      ---
      - list: my_list
@@ -404,12 +406,15 @@ trace_files: !mux
  invalid_rule_append_dangling:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      Rule my_rule has 'append' key but no rule by that name already exists
      ---
      - rule: my_rule
        condition: evt.type=open
        append: true
      ---
+      1 warnings:
+      Rule my_rule: consider adding an exceptions property to define supported exceptions fields
    validate_rules_file:
      - rules/rule_append_failure.yaml
    trace_file: trace_files/cat_write.scap
@@ -418,7 +423,8 @@ trace_files: !mux
    exit_status: 1
    stdout_contains: |+
      .*invalid_base_macro.yaml: Ok
-      .*invalid_overwrite_macro.yaml: Compilation error when compiling "foo": Undefined macro 'foo' used in filter.
+      .*invalid_overwrite_macro.yaml: 1 errors:
+      Compilation error when compiling "foo": Undefined macro 'foo' used in filter.
      ---
      - macro: some macro
        condition: foo
@@ -433,7 +439,8 @@ trace_files: !mux
    exit_status: 1
    stdout_contains: |+
      .*invalid_base_macro.yaml: Ok
-      .*invalid_append_macro.yaml: Compilation error when compiling "evt.type=execve foo": 17: syntax error, unexpected 'foo', expecting 'or', 'and'
+      .*invalid_append_macro.yaml: 1 errors:
+      Compilation error when compiling "evt.type=execve foo": 17: syntax error, unexpected 'foo', expecting 'or', 'and'
      ---
      - macro: some macro
        condition: evt.type=execve
@@ -450,6 +457,7 @@ trace_files: !mux
  invalid_overwrite_macro_multiple_docs:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      Compilation error when compiling "foo": Undefined macro 'foo' used in filter.
      ---
      - macro: some macro
@@ -463,6 +471,7 @@ trace_files: !mux
  invalid_append_macro_multiple_docs:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      Compilation error when compiling "evt.type=execve foo": 17: syntax error, unexpected 'foo', expecting 'or', 'and'
      ---
      - macro: some macro
@@ -480,7 +489,8 @@ trace_files: !mux
    exit_status: 1
    stdout_contains: |+
      .*invalid_base_rule.yaml: Ok
-      .*invalid_overwrite_rule.yaml: Undefined macro 'bar' used in filter.
+      .*invalid_overwrite_rule.yaml: 1 errors:
+      Undefined macro 'bar' used in filter.
      ---
      - rule: some rule
        desc: some desc
@@ -498,7 +508,8 @@ trace_files: !mux
    exit_status: 1
    stdout_contains: |+
      .*invalid_base_rule.yaml: Ok
-      .*invalid_append_rule.yaml: Compilation error when compiling "evt.type=open bar": 15: syntax error, unexpected 'bar', expecting 'or', 'and'
+      .*invalid_append_rule.yaml: 1 errors:
+      Compilation error when compiling "evt.type=open bar": 15: syntax error, unexpected 'bar', expecting 'or', 'and'
      ---
      - rule: some rule
        desc: some desc
@@ -521,6 +532,7 @@ trace_files: !mux
  invalid_overwrite_rule_multiple_docs:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      Undefined macro 'bar' used in filter.
      ---
      - rule: some rule
@@ -530,6 +542,9 @@ trace_files: !mux
        priority: INFO
        append: false
      ---
+      2 warnings:
+      Rule some rule: consider adding an exceptions property to define supported exceptions fields
+      Rule some rule: consider adding an exceptions property to define supported exceptions fields
    validate_rules_file:
      - rules/invalid_overwrite_rule_multiple_docs.yaml
    trace_file: trace_files/cat_write.scap
@@ -552,6 +567,9 @@ trace_files: !mux
        priority: INFO
        append: true
      ---
+      2 warnings:
+      Rule some rule: consider adding an exceptions property to define supported exceptions fields
+      Rule some rule: consider adding an exceptions property to define supported exceptions fields
    validate_rules_file:
      - rules/invalid_append_rule_multiple_docs.yaml
    trace_file: trace_files/cat_write.scap
@@ -559,6 +577,7 @@ trace_files: !mux
  invalid_missing_rule_name:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      Rule name is empty
      ---
      - rule:
@@ -573,6 +592,7 @@ trace_files: !mux
  invalid_missing_list_name:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      List name is empty
      ---
      - list:
@@ -585,6 +605,7 @@ trace_files: !mux
  invalid_missing_macro_name:
    exit_status: 1
    stdout_is: |+
+      1 errors:
      Macro name is empty
      ---
      - macro:
@@ -596,8 +617,19 @@ trace_files: !mux

  invalid_rule_output:
    exit_status: 1
-    stderr_contains: "Runtime error: Error loading rules:.* Invalid output format 'An open was seen %not_a_real_field': 'invalid formatting token not_a_real_field'. Exiting."
-    rules_file:
+    stdout_is: |+
+      1 errors:
+      Invalid output format 'An open was seen %not_a_real_field': 'invalid formatting token not_a_real_field'
+      ---
+      - rule: rule_with_invalid_output
+        desc: A rule with an invalid output field
+        condition: evt.type=open
+        output: "An open was seen %not_a_real_field"
+        priority: WARNING
+      ---
+      1 warnings:
+      Rule rule_with_invalid_output: consider adding an exceptions property to define supported exceptions fields
+    validate_rules_file:
      - rules/invalid_rule_output.yaml
    trace_file: trace_files/cat_write.scap

@@ -1117,7 +1149,7 @@ trace_files: !mux

  skip_unknown_noevt:
    detect: False
-    stdout_contains: Skipping rule "Contains Unknown Event And Skipping" that contains unknown filter proc.nobody
+    stdout_contains: Skipping rule "Contains Unknown Event And Skipping". contains unknown filter proc.nobody
    rules_file:
      - rules/skip_unknown_evt.yaml
    trace_file: trace_files/cat_write.scap
@@ -1130,14 +1162,33 @@ trace_files: !mux

  skip_unknown_error:
    exit_status: 1
-    stderr_contains: Rule "Contains Unknown Event And Not Skipping" contains unknown filter proc.nobody. Exiting.
+    stderr_contains: |+
+      Could not load rules file.*skip_unknown_error.yaml: 1 errors:
+      rule "Contains Unknown Event And Not Skipping". contains unknown filter proc.nobody
+      ---
+      - rule: Contains Unknown Event And Not Skipping
+        desc: Contains an unknown event
+        condition: proc.nobody=cat
+        output: Never
+        skip-if-unknown-filter: false
+        priority: INFO
+      ---
    rules_file:
      - rules/skip_unknown_error.yaml
    trace_file: trace_files/cat_write.scap

  skip_unknown_unspec_error:
    exit_status: 1
-    stderr_contains: Rule "Contains Unknown Event And Unspecified" contains unknown filter proc.nobody. Exiting.
+    stderr_contains: |+
+      Could not load rules file .*skip_unknown_unspec.yaml: 1 errors:
+      rule "Contains Unknown Event And Unspecified". contains unknown filter proc.nobody
+      ---
+      - rule: Contains Unknown Event And Unspecified
+        desc: Contains an unknown event
+        condition: proc.nobody=cat
+        output: Never
+        priority: INFO
+      ---
    rules_file:
      - rules/skip_unknown_unspec.yaml
    trace_file: trace_files/cat_write.scap
--- a/test/falco_tests_exceptions.yaml
+++ b/test/falco_tests_exceptions.yaml
@@ -0,0 +1,323 @@
+#
+# Copyright (C) 2016-2020 The Falco Authors..
+#
+# This file is part of falco.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+trace_files: !mux
+
+  rule_exception_no_fields:
+    exit_status: 1
+    stdout_is: |+
+      1 errors:
+      Rule exception item ex1: must have fields property with a list of fields
+      ---
+      - rule: My Rule
+        desc: Some desc
+        condition: evt.type=open and proc.name=cat
+        output: Some output
+        exceptions:
+          - name: ex1
+        priority: error
+      ---
+    validate_rules_file:
+      - rules/exceptions/item_no_fields.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_no_name:
+    exit_status: 1
+    stdout_is: |+
+      1 errors:
+      Rule exception item must have name property
+      ---
+      - rule: My Rule
+        desc: Some desc
+        condition: evt.type=open and proc.name=cat
+        output: Some output
+        exceptions:
+          - fields: [proc.name, fd.filename]
+        priority: error
+      ---
+    validate_rules_file:
+      - rules/exceptions/item_no_name.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_append_no_name:
+    exit_status: 1
+    stdout_is: |+
+      1 errors:
+      Rule exception item must have name property
+      ---
+      - rule: My Rule
+        exceptions:
+          - values:
+              - [nginx, /tmp/foo]
+        append: true
+      ---
+    validate_rules_file:
+      - rules/exceptions/append_item_no_name.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_unknown_fields:
+    exit_status: 1
+    stdout_is: |+
+      1 errors:
+      Rule exception item ex1: field name not.exist is not a supported filter field
+      ---
+      - rule: My Rule
+        desc: Some desc
+        condition: evt.type=open and proc.name=cat
+        output: Some output
+        exceptions:
+          - name: ex1
+            fields: [not.exist]
+        priority: error
+      ---
+    validate_rules_file:
+      - rules/exceptions/item_unknown_fields.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_comps_fields_len_mismatch:
+    exit_status: 1
+    stdout_is: |+
+      1 errors:
+      Rule exception item ex1: fields and comps lists must have equal length
+      ---
+      - rule: My Rule
+        desc: Some desc
+        condition: evt.type=open and proc.name=cat
+        output: Some output
+        exceptions:
+          - name: ex1
+            fields: [proc.name, fd.filename]
+            comps: [=]
+        priority: error
+      ---
+    validate_rules_file:
+      - rules/exceptions/item_comps_fields_len_mismatch.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_unknown_comp:
+    exit_status: 1
+    stdout_is: |+
+      1 errors:
+      Rule exception item ex1: comparison operator no-comp is not a supported comparison operator
+      ---
+      - rule: My Rule
+        desc: Some desc
+        condition: evt.type=open and proc.name=cat
+        output: Some output
+        exceptions:
+          - name: ex1
+            fields: [proc.name, fd.filename]
+            comps: [=, no-comp]
+        priority: error
+      ---
+    validate_rules_file:
+      - rules/exceptions/item_unknown_comp.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_fields_values_len_mismatch:
+    exit_status: 1
+    stdout_is: |+
+      1 errors:
+      Exception item ex1: fields and values lists must have equal length
+      ---
+      - rule: My Rule
+        desc: Some desc
+        condition: evt.type=open and proc.name=cat
+        output: Some output
+        exceptions:
+          - name: ex1
+            fields: [proc.name, fd.filename]
+            values:
+              - [nginx]
+        priority: error
+      ---
+    validate_rules_file:
+      - rules/exceptions/item_fields_values_len_mismatch.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_append_fields_values_len_mismatch:
+    exit_status: 1
+    stdout_is: |+
+      1 errors:
+      Exception item ex1: fields and values lists must have equal length
+      ---
+      - rule: My Rule
+        desc: Some desc
+        condition: evt.type=open and proc.name=cat
+        output: Some output
+        exceptions:
+          - name: ex1
+            fields: [proc.name, fd.filename]
+        priority: error
+
+      - rule: My Rule
+        exceptions:
+          - name: ex1
+            values:
+              - [nginx]
+        append: true
+      ---
+    validate_rules_file:
+      - rules/exceptions/append_item_fields_values_len_mismatch.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_append_item_not_in_rule:
+    exit_status: 0
+    stderr_contains: |+
+      1 warnings:
+      Rule My Rule with append=true: no set of fields matching name ex2
+    validate_rules_file:
+      - rules/exceptions/append_item_not_in_rule.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_without_exception:
+    exit_status: 0
+    stderr_contains: |+
+      1 warnings:
+      Rule My Rule: consider adding an exceptions property to define supported exceptions fields
+    validate_rules_file:
+      - rules/exceptions/rule_without_exception.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_no_values:
+    detect: True
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_no_values.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_one_value:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_one_value.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_append_one_value:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_append_one_value.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_second_value:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_second_value.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_append_second_value:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_append_second_value.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_second_item:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_second_item.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_append_second_item:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_append_second_item.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_third_item:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_third_item.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_append_third_item:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_append_third_item.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_quoted:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_quoted.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_append_multiple_values:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_append_multiple.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_comp:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_comp.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_append_comp:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_append_comp.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_values_listref:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_values_listref.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_values_listref_noparens:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_values_listref_noparens.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_values_list:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_values_list.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_single_field:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_single_field.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_single_field_append:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_single_field_append.yaml
+    trace_file: trace_files/cat_write.scap
+
+
--- a/test/rules/exceptions/append_item_fields_values_len_mismatch.yaml
+++ b/test/rules/exceptions/append_item_fields_values_len_mismatch.yaml
@@ -0,0 +1,31 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: My Rule
+  desc: Some desc
+  condition: evt.type=open and proc.name=cat
+  output: Some output
+  exceptions:
+    - name: ex1
+      fields: [proc.name, fd.filename]
+  priority: error
+
+- rule: My Rule
+  exceptions:
+    - name: ex1
+      values:
+        - [nginx]
+  append: true
--- a/test/rules/exceptions/append_item_no_name.yaml
+++ b/test/rules/exceptions/append_item_no_name.yaml
@@ -0,0 +1,30 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: My Rule
+  desc: Some desc
+  condition: evt.type=open and proc.name=cat
+  output: Some output
+  exceptions:
+    - name: ex1
+      fields: [proc.name, fd.filename]
+  priority: error
+
+- rule: My Rule
+  exceptions:
+    - values:
+        - [nginx, /tmp/foo]
+  append: true
--- a/test/rules/exceptions/append_item_not_in_rule.yaml
+++ b/test/rules/exceptions/append_item_not_in_rule.yaml
@@ -0,0 +1,31 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: My Rule
+  desc: Some desc
+  condition: evt.type=open and proc.name=cat
+  output: Some output
+  exceptions:
+    - name: ex1
+      fields: [proc.name, fd.filename]
+  priority: error
+
+- rule: My Rule
+  exceptions:
+    - name: ex2
+      values:
+        - [apache, /tmp]
+  append: true
--- a/test/rules/exceptions/item_comps_fields_len_mismatch.yaml
+++ b/test/rules/exceptions/item_comps_fields_len_mismatch.yaml
@@ -0,0 +1,25 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: My Rule
+  desc: Some desc
+  condition: evt.type=open and proc.name=cat
+  output: Some output
+  exceptions:
+    - name: ex1
+      fields: [proc.name, fd.filename]
+      comps: [=]
+  priority: error
--- a/test/rules/exceptions/item_fields_values_len_mismatch.yaml
+++ b/test/rules/exceptions/item_fields_values_len_mismatch.yaml
@@ -0,0 +1,26 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: My Rule
+  desc: Some desc
+  condition: evt.type=open and proc.name=cat
+  output: Some output
+  exceptions:
+    - name: ex1
+      fields: [proc.name, fd.filename]
+      values:
+        - [nginx]
+  priority: error
--- a/test/rules/exceptions/item_no_fields.yaml
+++ b/test/rules/exceptions/item_no_fields.yaml
@@ -0,0 +1,23 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: My Rule
+  desc: Some desc
+  condition: evt.type=open and proc.name=cat
+  output: Some output
+  exceptions:
+    - name: ex1
+  priority: error
--- a/test/rules/exceptions/item_no_name.yaml
+++ b/test/rules/exceptions/item_no_name.yaml
@@ -0,0 +1,23 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: My Rule
+  desc: Some desc
+  condition: evt.type=open and proc.name=cat
+  output: Some output
+  exceptions:
+    - fields: [proc.name, fd.filename]
+  priority: error
--- a/test/rules/exceptions/item_unknown_comp.yaml
+++ b/test/rules/exceptions/item_unknown_comp.yaml
@@ -0,0 +1,25 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: My Rule
+  desc: Some desc
+  condition: evt.type=open and proc.name=cat
+  output: Some output
+  exceptions:
+    - name: ex1
+      fields: [proc.name, fd.filename]
+      comps: [=, no-comp]
+  priority: error
--- a/test/rules/exceptions/item_unknown_fields.yaml
+++ b/test/rules/exceptions/item_unknown_fields.yaml
@@ -0,0 +1,24 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: My Rule
+  desc: Some desc
+  condition: evt.type=open and proc.name=cat
+  output: Some output
+  exceptions:
+    - name: ex1
+      fields: [not.exist]
+  priority: error
--- a/test/rules/exceptions/rule_exception_append_comp.yaml
+++ b/test/rules/exceptions/rule_exception_append_comp.yaml
@@ -0,0 +1,38 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name
+      fields: [proc.name]
+    - name: proc_name_contains
+      fields: [proc.name]
+      comps: [contains]
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+    - name: proc_name_cmdline_pname
+      fields: [proc.name, proc.cmdline, proc.pname]
+  priority: WARNING
+
+- rule: Open From Cat
+  exceptions:
+    - name: proc_name_contains
+      values:
+        - [cat]
+  append: true
--- a/test/rules/exceptions/rule_exception_append_multiple.yaml
+++ b/test/rules/exceptions/rule_exception_append_multiple.yaml
@@ -0,0 +1,42 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name
+      fields: [proc.name]
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+    - name: proc_name_cmdline_pname
+      fields: [proc.name, proc.cmdline, proc.pname]
+  priority: WARNING
+
+- rule: Open From Cat
+  exceptions:
+    - name: proc_name
+      values:
+        - [not-cat]
+  append: true
+
+- rule: Open From Cat
+  exceptions:
+    - name: proc_name
+      values:
+        - [cat]
+  append: true
--- a/test/rules/exceptions/rule_exception_append_one_value.yaml
+++ b/test/rules/exceptions/rule_exception_append_one_value.yaml
@@ -0,0 +1,37 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name
+      fields: [proc.name]
+      values:
+        - [cat]
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+    - name: proc_name_cmdline_pname
+      fields: [proc.name, proc.cmdline, proc.pname]
+  priority: WARNING
+
+- rule: Open From Cat
+  exceptions:
+    - name: proc_name
+      values:
+        - [cat]
+  append: true
--- a/test/rules/exceptions/rule_exception_append_second_item.yaml
+++ b/test/rules/exceptions/rule_exception_append_second_item.yaml
@@ -0,0 +1,41 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name
+      fields: [proc.name]
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+    - name: proc_name_cmdline_pname
+      fields: [proc.name, proc.cmdline, proc.pname]
+  priority: WARNING
+
+- rule: Open From Cat
+  exceptions:
+    - name: proc_name
+      values:
+        - [not-cat]
+    - name: proc_name_cmdline
+      values:
+        - [cat, "cat /dev/null"]
+    - name: proc_name_cmdline_pname
+      values:
+        - [not-cat, "cat /dev/null", bash]
+  append: true
--- a/test/rules/exceptions/rule_exception_append_second_value.yaml
+++ b/test/rules/exceptions/rule_exception_append_second_value.yaml
@@ -0,0 +1,36 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name
+      fields: [proc.name]
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+    - name: proc_name_cmdline_pname
+      fields: [proc.name, proc.cmdline, proc.pname]
+  priority: WARNING
+
+- rule: Open From Cat
+  exceptions:
+    - name: proc_name_cmdline
+      values:
+        - [not-cat, not-cat]
+        - [cat, "cat /dev/null"]
+  append: true
--- a/test/rules/exceptions/rule_exception_append_third_item.yaml
+++ b/test/rules/exceptions/rule_exception_append_third_item.yaml
@@ -0,0 +1,41 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name
+      fields: [proc.name]
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+    - name: proc_name_cmdline_pname
+      fields: [proc.name, proc.cmdline, proc.pname]
+  priority: WARNING
+
+- rule: Open From Cat
+  exceptions:
+    - name: proc_name
+      values:
+        - [not-cat]
+    - name: proc_name_cmdline
+      values:
+        - [not-cat, "cat /dev/null"]
+    - name: proc_name_cmdline_pname
+      values:
+        - [cat, "cat /dev/null", bash]
+  append: true
--- a/test/rules/exceptions/rule_exception_comp.yaml
+++ b/test/rules/exceptions/rule_exception_comp.yaml
@@ -0,0 +1,34 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name
+      fields: [proc.name]
+    - name: proc_name_contains
+      fields: [proc.name]
+      comps: [contains]
+      values:
+        - [cat]
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+    - name: proc_name_cmdline_pname
+      fields: [proc.name, proc.cmdline, proc.pname]
+  priority: WARNING
+
--- a/test/rules/exceptions/rule_exception_no_values.yaml
+++ b/test/rules/exceptions/rule_exception_no_values.yaml
@@ -0,0 +1,28 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name
+      fields: [proc.name]
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+    - name: proc_name_cmdline_pname
+      fields: [proc.name, proc.cmdline, proc.pname]
+  priority: WARNING
--- a/test/rules/exceptions/rule_exception_one_value.yaml
+++ b/test/rules/exceptions/rule_exception_one_value.yaml
@@ -0,0 +1,30 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name
+      fields: [proc.name]
+      values:
+        - [cat]
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+    - name: proc_name_cmdline_pname
+      fields: [proc.name, proc.cmdline, proc.pname]
+  priority: WARNING
--- a/test/rules/exceptions/rule_exception_quoted.yaml
+++ b/test/rules/exceptions/rule_exception_quoted.yaml
@@ -0,0 +1,36 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name
+      fields: [proc.name]
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+    - name: proc_name_cmdline_pname
+      fields: [proc.name, proc.cmdline, proc.pname]
+  priority: WARNING
+
+- rule: Open From Cat
+  exceptions:
+    - name: proc_name_cmdline
+      values:
+        - [not-cat, not-cat]
+        - [cat, '"cat /dev/null"']
+  append: true
--- a/test/rules/exceptions/rule_exception_second_item.yaml
+++ b/test/rules/exceptions/rule_exception_second_item.yaml
@@ -0,0 +1,34 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name
+      fields: [proc.name]
+      values:
+        - [not-cat]
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+      values:
+        - [cat, "cat /dev/null"]
+    - name: proc_name_cmdline_pname
+      fields: [proc.name, proc.cmdline, proc.pname]
+      values:
+        - [not-cat, "cat /dev/null", bash]
+  priority: WARNING
--- a/test/rules/exceptions/rule_exception_second_value.yaml
+++ b/test/rules/exceptions/rule_exception_second_value.yaml
@@ -0,0 +1,32 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name
+      fields: [proc.name]
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+      values:
+        - [not-cat, not-cat]
+        - [cat, "cat /dev/null"]
+    - name: proc_name_cmdline_pname
+      fields: [proc.name, proc.cmdline, proc.pname]
+  priority: WARNING
+
--- a/test/rules/exceptions/rule_exception_single_field.yaml
+++ b/test/rules/exceptions/rule_exception_single_field.yaml
@@ -0,0 +1,30 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_cmdline
+      fields: proc.cmdline
+      comps: in
+      values:
+        - cat /dev/zero
+        - "cat /dev/null"
+  priority: WARNING
+
--- a/test/rules/exceptions/rule_exception_single_field_append.yaml
+++ b/test/rules/exceptions/rule_exception_single_field_append.yaml
@@ -0,0 +1,37 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_cmdline
+      fields: proc.cmdline
+      comps: in
+      values:
+        - cat /dev/zero
+  priority: WARNING
+
+- rule: Open From Cat
+  exceptions:
+    - name: proc_cmdline
+      values:
+        - "cat /dev/null"
+  append: true
+
+
--- a/test/rules/exceptions/rule_exception_third_item.yaml
+++ b/test/rules/exceptions/rule_exception_third_item.yaml
@@ -0,0 +1,34 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name
+      fields: [proc.name]
+      values:
+        - [not-cat]
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+      values:
+        - [not-cat, "cat /dev/null"]
+    - name: proc_name_cmdline_pname
+      fields: [proc.name, proc.cmdline, proc.pname]
+      values:
+        - [cat, "cat /dev/null", bash]
+  priority: WARNING
--- a/test/rules/exceptions/rule_exception_values_list.yaml
+++ b/test/rules/exceptions/rule_exception_values_list.yaml
@@ -0,0 +1,29 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+      comps: [=, in]
+      values:
+        - [cat, [cat /dev/zero, "cat /dev/null"]]
+  priority: WARNING
+
--- a/test/rules/exceptions/rule_exception_values_listref.yaml
+++ b/test/rules/exceptions/rule_exception_values_listref.yaml
@@ -0,0 +1,32 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+- list: cat_cmdlines
+  items: [cat /dev/zero, "cat /dev/null"]
+
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+      comps: [=, in]
+      values:
+        - [cat, (cat_cmdlines)]
+  priority: WARNING
+
--- a/test/rules/exceptions/rule_exception_values_listref_noparens.yaml
+++ b/test/rules/exceptions/rule_exception_values_listref_noparens.yaml
@@ -0,0 +1,32 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+- list: cat_cmdlines
+  items: [cat /dev/zero, "cat /dev/null"]
+
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_name_cmdline
+      fields: [proc.name, proc.cmdline]
+      comps: [=, in]
+      values:
+        - [cat, cat_cmdlines]
+  priority: WARNING
+
--- a/test/rules/exceptions/rule_without_exception.yaml
+++ b/test/rules/exceptions/rule_without_exception.yaml
@@ -0,0 +1,21 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: My Rule
+  desc: Some desc
+  condition: evt.type=open and proc.name=cat
+  output: Some output
+  priority: error
--- a/test/rules/invalid_unexpected_object.yaml
+++ b/test/rules/invalid_unexpected_object.yaml
@@ -1 +0,0 @@
- foo: bar
--- a/test/run_regression_tests.sh
+++ b/test/run_regression_tests.sh
@@ -98,7 +98,7 @@ function run_tests() {
    # as we're watching the return status when running avocado.
    set +e
    TEST_RC=0
-    suites=($SCRIPTDIR/falco_traces.yaml $SCRIPTDIR/falco_tests.yaml $SCRIPTDIR/falco_k8s_audit_tests.yaml $SCRIPTDIR/falco_tests_psp.yaml)
+    suites=($SCRIPTDIR/falco_traces.yaml $SCRIPTDIR/falco_tests.yaml $SCRIPTDIR/falco_k8s_audit_tests.yaml $SCRIPTDIR/falco_tests_psp.yaml $SCRIPTDIR/falco_tests_exceptions.yaml)

    if [ "$SKIP_PACKAGES_TESTS" = false ] ; then
        suites+=($SCRIPTDIR/falco_tests_package.yaml)
--- a/userspace/engine/falco_engine.cpp
+++ b/userspace/engine/falco_engine.cpp
@@ -45,6 +45,7 @@ nlohmann::json::json_pointer falco_engine::k8s_audit_time = "/stageTimestamp"_js
 falco_engine::falco_engine(bool seed_rng, const std::string& alternate_lua_dir)
 	: m_rules(NULL), m_next_ruleset_id(0),
 	  m_min_priority(falco_common::PRIORITY_DEBUG),
+	  m_alternate_lua_dir(alternate_lua_dir),
 	  m_sampling_ratio(1), m_sampling_multiplier(0),
 	  m_replace_container_info(false)
 {
@@ -68,6 +69,35 @@ falco_engine::falco_engine(bool seed_rng, const std::string& alternate_lua_dir)
 	m_json_factory = make_shared<json_event_filter_factory>();
 }

+falco_engine::falco_engine(const falco_engine &orig_engine)
+	: m_rules(NULL), m_next_ruleset_id(0),
+	  m_min_priority(falco_common::PRIORITY_DEBUG),
+	  m_sampling_ratio(1), m_sampling_multiplier(0),
+	  m_replace_container_info(false)
+{
+	luaopen_lpeg(m_ls);
+	luaopen_yaml(m_ls);
+
+	m_alternate_lua_dir = orig_engine.m_alternate_lua_dir;
+	falco_common::init(m_lua_main_filename.c_str(), m_alternate_lua_dir.c_str());
+	falco_rules::init(m_ls);
+
+	m_sinsp_rules.reset(new falco_sinsp_ruleset());
+	m_k8s_audit_rules.reset(new falco_ruleset());
+
+	m_default_ruleset_id = find_ruleset_id(m_default_ruleset);
+
+	// Create this now so we can potentially list filters and exit
+	m_json_factory = make_shared<json_event_filter_factory>();
+
+	set_inspector(orig_engine.m_inspector);
+	std::string extra = orig_engine.m_extra;
+	set_extra(extra, orig_engine.m_replace_container_info);
+	set_min_priority(orig_engine.m_min_priority);
+	set_sampling_multiplier(orig_engine.m_sampling_multiplier);
+	set_sampling_ratio(orig_engine.m_sampling_ratio);
+}
+
 falco_engine::~falco_engine()
 {
 	if (m_rules)
@@ -302,31 +332,9 @@ unique_ptr<falco_engine::rule_result> falco_engine::process_sinsp_event(sinsp_ev
 	}

 	unique_ptr<struct rule_result> res(new rule_result());
+	res->source = "syscall";

-	std::lock_guard<std::mutex> guard(m_ls_semaphore);
-	lua_getglobal(m_ls, lua_on_event.c_str());
-	if(lua_isfunction(m_ls, -1))
-	{
-		lua_pushnumber(m_ls, ev->get_check_id());
-
-		if(lua_pcall(m_ls, 1, 3, 0) != 0)
-		{
-			const char* lerr = lua_tostring(m_ls, -1);
-			string err = "Error invoking function output: " + string(lerr);
-			throw falco_exception(err);
-		}
-		res->evt = ev;
-		const char *p =  lua_tostring(m_ls, -3);
-		res->rule = p;
-		res->source = "syscall";
-		res->priority_num = (falco_common::priority_type) lua_tonumber(m_ls, -2);
-		res->format = lua_tostring(m_ls, -1);
-		lua_pop(m_ls, 3);
-	}
-	else
-	{
-		throw falco_exception("No function " + lua_on_event + " found in lua compiler module");
-	}
+	populate_rule_result(res, ev);

 	return res;
 }
@@ -350,33 +358,50 @@ unique_ptr<falco_engine::rule_result> falco_engine::process_k8s_audit_event(json
 	}

 	unique_ptr<struct rule_result> res(new rule_result());
+	res->source = "k8s_audit";

+	populate_rule_result(res, ev);
+
+	return res;
+}
+
+void falco_engine::populate_rule_result(unique_ptr<struct rule_result> &res, gen_event *ev)
+{
 	std::lock_guard<std::mutex> guard(m_ls_semaphore);
 	lua_getglobal(m_ls, lua_on_event.c_str());
 	if(lua_isfunction(m_ls, -1))
 	{
 		lua_pushnumber(m_ls, ev->get_check_id());

-		if(lua_pcall(m_ls, 1, 3, 0) != 0)
+		if(lua_pcall(m_ls, 1, 4, 0) != 0)
 		{
 			const char* lerr = lua_tostring(m_ls, -1);
 			string err = "Error invoking function output: " + string(lerr);
 			throw falco_exception(err);
 		}
-		res->evt = ev;
-		const char *p =  lua_tostring(m_ls, -3);
+		const char *p =  lua_tostring(m_ls, -4);
 		res->rule = p;
-		res->source = "k8s_audit";
-		res->priority_num = (falco_common::priority_type) lua_tonumber(m_ls, -2);
-		res->format = lua_tostring(m_ls, -1);
-		lua_pop(m_ls, 3);
+		res->evt = ev;
+		res->priority_num = (falco_common::priority_type) lua_tonumber(m_ls, -3);
+		res->format = lua_tostring(m_ls, -2);
+
+		// Exception fields are passed back as a table
+		lua_pushnil(m_ls);  /* first key */
+		while (lua_next(m_ls, -2) != 0) {
+			// key is at index -2, value is at index
+			// -1. We want the keys.
+			res->exception_fields.insert(luaL_checkstring(m_ls, -2));
+
+			// Remove value, keep key for next iteration
+			lua_pop(m_ls, 1);
+		}
+
+		lua_pop(m_ls, 4);
 	}
 	else
 	{
 		throw falco_exception("No function " + lua_on_event + " found in lua compiler module");
 	}
-
-	return res;
 }

 bool falco_engine::parse_k8s_audit_json(nlohmann::json &j, std::list<json_event> &evts, bool top)
--- a/userspace/engine/falco_engine.h
+++ b/userspace/engine/falco_engine.h
@@ -47,7 +47,8 @@ limitations under the License.
 class falco_engine : public falco_common
 {
 public:
-	falco_engine(bool seed_rng=true, const std::string& alternate_lua_dir=FALCO_ENGINE_SOURCE_LUA_DIR);
+	explicit falco_engine(bool seed_rng=true, const std::string& alternate_lua_dir=FALCO_ENGINE_SOURCE_LUA_DIR);
+	falco_engine(const falco_engine &orig_engine);
 	virtual ~falco_engine();

 	// A given engine has a version which identifies the fields
@@ -160,6 +161,7 @@ public:
 		std::string source;
 		falco_common::priority_type priority_num;
 		std::string format;
+		std::set<std::string> exception_fields;
 	};

 	//
@@ -262,6 +264,9 @@ private:
 	std::unique_ptr<falco_sinsp_ruleset> m_sinsp_rules;
 	std::unique_ptr<falco_ruleset> m_k8s_audit_rules;

+	void populate_rule_result(unique_ptr<struct rule_result> &res, gen_event *ev);
+	std::string m_alternate_lua_dir;
+
 	//
 	// Here's how the sampling ratio and multiplier influence
 	// whether or not an event is dropped in
--- a/userspace/engine/falco_engine_version.h
+++ b/userspace/engine/falco_engine_version.h
@@ -16,7 +16,7 @@ limitations under the License.

 // The version of rules/filter fields/etc supported by this falco
 // engine.
-#define FALCO_ENGINE_VERSION (7)
+#define FALCO_ENGINE_VERSION (8)

 // This is the result of running "falco --list -N | sha256sum" and
 // represents the fields supported by this version of falco. It's used
--- a/userspace/engine/formats.cpp
+++ b/userspace/engine/formats.cpp
@@ -60,25 +60,32 @@ int falco_formats::lua_formatter(lua_State *ls)
 		{
 			sinsp_evt_formatter *formatter;
 			formatter = new sinsp_evt_formatter(s_inspector, format);
+			lua_pushnil(ls);
 			lua_pushlightuserdata(ls, formatter);
 		}
 		else
 		{
 			json_event_formatter *formatter;
 			formatter = new json_event_formatter(s_engine->json_factory(), format);
+			lua_pushnil(ls);
 			lua_pushlightuserdata(ls, formatter);
 		}
 	}
-	catch(sinsp_exception &e)
+	catch(exception &e)
 	{
-		luaL_error(ls, "Invalid output format '%s': '%s'", format.c_str(), e.what());
-	}
-	catch(falco_exception &e)
-	{
-		luaL_error(ls, "Invalid output format '%s': '%s'", format.c_str(), e.what());
+		std::ostringstream os;
+
+		os << "Invalid output format '"
+		   << format
+		   << "': '"
+		   << e.what()
+		   << "'";
+
+		lua_pushstring(ls, os.str().c_str());
+		lua_pushnil(ls);
 	}

-	return 1;
+	return 2;
 }

 int falco_formats::lua_free_formatter(lua_State *ls)
--- a/userspace/engine/lua/rule_loader.lua
+++ b/userspace/engine/lua/rule_loader.lua
@@ -126,6 +126,31 @@ function set_output(output_format, state)
   end
 end

+-- This should be keep in sync with parser.lua
+defined_comp_operators = {
+   ["="]=1,
+   ["=="] = 1,
+   ["!="] = 1,
+   ["<="] = 1,
+   [">="] = 1,
+   ["<"] = 1,
+   [">"] = 1,
+   ["contains"] = 1,
+   ["icontains"] = 1,
+   ["glob"] = 1,
+   ["startswith"] = 1,
+   ["endswith"] = 1,
+   ["in"] = 1,
+   ["intersects"] = 1,
+   ["pmatch"] = 1
+}
+
+defined_list_comp_operators = {
+   ["in"] = 1,
+   ["intersects"] = 1,
+   ["pmatch"] = 1
+}
+
 -- Note that the rules_by_name and rules_by_idx refer to the same rule
 -- object. The by_name index is used for things like describing rules,
 -- and the by_idx index is used to map the relational node index back
@@ -253,19 +278,126 @@ function get_lines(rules_lines, row, num_lines)
   return ret
 end

+function quote_item(item)
+
+   -- Add quotes if the string contains spaces and doesn't start/end
+   -- w/ quotes
+   if string.find(item, " ") then
+      if string.sub(item, 1, 1) ~= "'" and string.sub(item, 1, 1) ~= '"' then
+	 item = "\""..item.."\""
+      end
+   end
+
+   return item
+end
+
+function paren_item(item)
+   if string.sub(item, 1, 1) ~= "(" then
+      item = "("..item..")"
+   end
+
+   return item
+end
+
 function build_error(rules_lines, row, num_lines, err)
   local ret = err.."\n---\n"..get_lines(rules_lines, row, num_lines).."---"

-   return ret
+   return {ret}
 end

 function build_error_with_context(ctx, err)
   local ret = err.."\n---\n"..ctx.."---"
-   return ret
+   return {ret}
 end

+function validate_exception_item_multi_fields(eitem, context)
+
+   local name = eitem['name']
+   local fields = eitem['fields']
+   local values = eitem['values']
+   local comps = eitem['comps']
+
+   if comps == nil then
+      comps = {}
+      for c=1,#fields do
+	 table.insert(comps, "=")
+      end
+      eitem['comps'] = comps
+   else
+      if #fields ~= #comps then
+	 return false, build_error_with_context(context, "Rule exception item "..name..": fields and comps lists must have equal length"), warnings
+      end
+   end
+   for k, fname in ipairs(fields) do
+      if not is_defined_filter(fname) then
+	 return false, build_error_with_context(context, "Rule exception item "..name..": field name "..fname.." is not a supported filter field"), warnings
+      end
+   end
+   for k, comp in ipairs(comps) do
+      if defined_comp_operators[comp] == nil then
+	 return false, build_error_with_context(context, "Rule exception item "..name..": comparison operator "..comp.." is not a supported comparison operator"), warnings
+      end
+   end
+end
+
+function validate_exception_item_single_field(eitem, context)
+
+   local name = eitem['name']
+   local fields = eitem['fields']
+   local values = eitem['values']
+   local comps = eitem['comps']
+
+   if comps == nil then
+      eitem['comps'] = "in"
+      comps = eitem['comps']
+   else
+      if type(fields) ~= "string" or type(comps) ~= "string" then
+	 return false, build_error_with_context(context, "Rule exception item "..name..": fields and comps must both be strings"), warnings
+      end
+   end
+   if not is_defined_filter(fields) then
+      return false, build_error_with_context(context, "Rule exception item "..name..": field name "..fields.." is not a supported filter field"), warnings
+   end
+   if defined_comp_operators[comps] == nil then
+      return false, build_error_with_context(context, "Rule exception item "..name..": comparison operator "..comps.." is not a supported comparison operator"), warnings
+   end
+end
+
+function is_defined_filter(filter)
+   if defined_noarg_filters[filter] ~= nil then
+      return true
+   else
+      bracket_idx = string.find(filter, "[", 1, true)
+
+      if bracket_idx ~= nil then
+	 subfilter = string.sub(filter, 1, bracket_idx-1)
+
+	 if defined_arg_filters[subfilter] ~= nil then
+	    return true
+	 end
+      end
+
+      dot_idx = string.find(filter, ".", 1, true)
+
+      while dot_idx ~= nil do
+	 subfilter = string.sub(filter, 1, dot_idx-1)
+
+	 if defined_arg_filters[subfilter] ~= nil then
+	    return true
+	 end
+
+	 dot_idx = string.find(filter, ".", dot_idx+1, true)
+      end
+   end
+
+   return false
+end
+
+
 function load_rules_doc(rules_mgr, doc, load_state)

+   local warnings = {}
+
   -- Iterate over yaml list. In this pass, all we're doing is
   -- populating the set of rules, macros, and lists. We're not
   -- expanding/compiling anything yet. All that will happen in a
@@ -279,7 +411,7 @@ function load_rules_doc(rules_mgr, doc, load_state)
 					load_state.indices[load_state.cur_item_idx])

      if (not (type(v) == "table")) then
-	 return false, build_error_with_context(context, "Unexpected element of type " ..type(v)..". Each element should be a yaml associative array.")
+	 return false, build_error_with_context(context, "Unexpected element of type " ..type(v)..". Each element should be a yaml associative array."), warnings
      end

      v['context'] = context
@@ -291,13 +423,13 @@ function load_rules_doc(rules_mgr, doc, load_state)
 	 end

 	 if falco_rules.engine_version(rules_mgr) < v['required_engine_version'] then
-	    return false, build_error_with_context(v['context'], "Rules require engine version "..v['required_engine_version']..", but engine version is "..falco_rules.engine_version(rules_mgr))
+	    return false, build_error_with_context(v['context'], "Rules require engine version "..v['required_engine_version']..", but engine version is "..falco_rules.engine_version(rules_mgr)), warnings
 	 end

      elseif (v['macro']) then

 	 if (v['macro'] == nil or type(v['macro']) == "table") then
-	    return false, build_error_with_context(v['context'], "Macro name is empty")
+	    return false, build_error_with_context(v['context'], "Macro name is empty"), warnings
 	 end

 	 if v['source'] == nil then
@@ -310,7 +442,7 @@ function load_rules_doc(rules_mgr, doc, load_state)

 	 for j, field in ipairs({'condition'}) do
 	    if (v[field] == nil) then
-	       return false, build_error_with_context(v['context'], "Macro must have property "..field)
+	       return false, build_error_with_context(v['context'], "Macro must have property "..field), warnings
 	    end
 	 end

@@ -323,7 +455,7 @@ function load_rules_doc(rules_mgr, doc, load_state)

 	 if append then
 	    if state.macros_by_name[v['macro']] == nil then
-	       return false, build_error_with_context(v['context'], "Macro " ..v['macro'].. " has 'append' key but no macro by that name already exists")
+	       return false, build_error_with_context(v['context'], "Macro " ..v['macro'].. " has 'append' key but no macro by that name already exists"), warnings
 	    end

 	    state.macros_by_name[v['macro']]['condition'] = state.macros_by_name[v['macro']]['condition'] .. " " .. v['condition']
@@ -338,7 +470,7 @@ function load_rules_doc(rules_mgr, doc, load_state)
      elseif (v['list']) then

 	 if (v['list'] == nil or type(v['list']) == "table") then
-	    return false, build_error_with_context(v['context'], "List name is empty")
+	    return false, build_error_with_context(v['context'], "List name is empty"), warnings
 	 end

 	 if state.lists_by_name[v['list']] == nil then
@@ -347,7 +479,7 @@ function load_rules_doc(rules_mgr, doc, load_state)

 	 for j, field in ipairs({'items'}) do
 	    if (v[field] == nil) then
-	       return false, build_error_with_context(v['context'], "List must have property "..field)
+	       return false, build_error_with_context(v['context'], "List must have property "..field), warnings
 	    end
 	 end

@@ -360,7 +492,7 @@ function load_rules_doc(rules_mgr, doc, load_state)

 	 if append then
 	    if state.lists_by_name[v['list']] == nil then
-	       return false, build_error_with_context(v['context'], "List " ..v['list'].. " has 'append' key but no list by that name already exists")
+	       return false, build_error_with_context(v['context'], "List " ..v['list'].. " has 'append' key but no list by that name already exists"), warnings
 	    end

 	    for j, elem in ipairs(v['items']) do
@@ -373,7 +505,11 @@ function load_rules_doc(rules_mgr, doc, load_state)
      elseif (v['rule']) then

 	 if (v['rule'] == nil or type(v['rule']) == "table") then
-	    return false, build_error_with_context(v['context'], "Rule name is empty")
+	    return false, build_error_with_context(v['context'], "Rule name is empty"), warnings
+	 end
+
+	 if (v['condition'] == nil and v['exceptions'] == nil) then
+	    return false, build_error_with_context(v['context'], "Rule must have exceptions or condition property"), warnings
 	 end

 	 -- By default, if a rule's condition refers to an unknown
@@ -386,6 +522,13 @@ function load_rules_doc(rules_mgr, doc, load_state)
 	    v['source'] = "syscall"
 	 end

+	 -- Add an empty exceptions property to the rule if not
+	 -- defined, but add a warning about defining one
+	 if v['exceptions'] == nil then
+	    warnings[#warnings + 1] = "Rule "..v['rule']..": consider adding an exceptions property to define supported exceptions fields"
+	    v['exceptions'] = {}
+	 end
+
 	 -- Possibly append to the condition field of an existing rule
 	 append = false

@@ -393,21 +536,95 @@ function load_rules_doc(rules_mgr, doc, load_state)
 	    append = v['append']
 	 end

-	 if append then
+	 -- Validate the contents of the rule exception
+	 if next(v['exceptions']) ~= nil then

-	    -- For append rules, all you need is the condition
-	    for j, field in ipairs({'condition'}) do
-	       if (v[field] == nil) then
-		  return false, build_error_with_context(v['context'], "Rule must have property "..field)
+	    -- This validation only applies if append=false. append=true validation is handled below
+	    if append == false then
+
+	       for _, eitem in ipairs(v['exceptions']) do
+
+		  if eitem['name'] == nil then
+		     return false, build_error_with_context(v['context'], "Rule exception item must have name property"), warnings
+		  end
+
+		  if eitem['fields'] == nil then
+		     return false, build_error_with_context(v['context'], "Rule exception item "..eitem['name']..": must have fields property with a list of fields"), warnings
+		  end
+
+		  if eitem['values'] == nil then
+		     -- An empty values array is okay
+		     eitem['values'] = {}
+		  end
+
+		  -- Different handling if the fields property is a single item vs a list
+		  local valid, err
+		  if type(eitem['fields']) == "table" then
+		     valid, err = validate_exception_item_multi_fields(eitem, v['context'])
+		  else
+		     valid, err = validate_exception_item_single_field(eitem, v['context'])
+		  end
+
+		  if valid == false then
+		     return valid, err
+		  end
 	       end
 	    end
+	 end
+
+	 if append then

 	    if state.rules_by_name[v['rule']] == nil then
 	       if state.skipped_rules_by_name[v['rule']] == nil then
-		  return false, build_error_with_context(v['context'], "Rule " ..v['rule'].. " has 'append' key but no rule by that name already exists")
+		  return false, build_error_with_context(v['context'], "Rule " ..v['rule'].. " has 'append' key but no rule by that name already exists"), warnings
 	       end
 	    else
-	       state.rules_by_name[v['rule']]['condition'] = state.rules_by_name[v['rule']]['condition'] .. " " .. v['condition']
+
+	       if next(v['exceptions']) ~= nil then
+
+		  for _, eitem in ipairs(v['exceptions']) do
+		     local name = eitem['name']
+		     local fields = eitem['fields']
+		     local comps = eitem['comps']
+
+		     if name == nil then
+			return false, build_error_with_context(v['context'], "Rule exception item must have name property"), warnings
+		     end
+
+		     -- You can't append exception fields or comps to a rule
+		     if fields ~= nil then
+			return false, build_error_with_context(v['context'], "Can not append exception fields to existing rule, only values"), warnings
+		     end
+
+		     if comps ~= nil then
+			return false, build_error_with_context(v['context'], "Can not append exception comps to existing rule, only values"), warnings
+		     end
+
+		     -- You can append values. They are added to the
+		     -- corresponding name, if it exists. If no
+		     -- exception with that name exists, add a
+		     -- warning.
+		     if eitem['values'] ~= nil then
+			local found=false
+			for _, reitem in ipairs(state.rules_by_name[v['rule']]['exceptions']) do
+			   if reitem['name'] == eitem['name'] then
+			      found=true
+			      for _, values in ipairs(eitem['values']) do
+				 reitem['values'][#reitem['values'] + 1] = values
+			      end
+			   end
+			end
+
+			if found == false then
+			   warnings[#warnings + 1] = "Rule "..v['rule'].." with append=true: no set of fields matching name "..eitem['name']
+			end
+		     end
+		  end
+	       end
+
+	       if v['condition'] ~= nil then
+		  state.rules_by_name[v['rule']]['condition'] = state.rules_by_name[v['rule']]['condition'] .. " " .. v['condition']
+	       end

 	    -- Add the current object to the context of the base rule
 	       state.rules_by_name[v['rule']]['context'] = state.rules_by_name[v['rule']]['context'].."\n"..v['context']
@@ -417,7 +634,7 @@ function load_rules_doc(rules_mgr, doc, load_state)

 	    for j, field in ipairs({'condition', 'output', 'desc', 'priority'}) do
 	       if (v[field] == nil) then
-		  return false, build_error_with_context(v['context'], "Rule must have property "..field)
+		  return false, build_error_with_context(v['context'], "Rule must have property "..field), warnings
 	       end
 	    end

@@ -446,16 +663,116 @@ function load_rules_doc(rules_mgr, doc, load_state)
 	    end
 	 end
      else
-	 -- Remove the context from the table, so the table is exactly what was parsed
 	 local context = v['context']
-	 v['context'] = nil
-	 return false, build_error_with_context(context, "Unknown rule object: "..table.tostring(v))
+
+	 arr = build_error_with_context(context, "Unknown top level object: "..table.tostring(v))
+	 warnings[#warnings + 1] = arr[1]
      end
   end

-   return true, ""
+   return true, {}, warnings
 end

+-- cond and not ((proc.name=apk and fd.directory=/usr/lib/alpine) or (proc.name=npm and fd.directory=/usr/node/bin) or ...)
+-- Populates exfields with all fields used
+function build_exception_condition_string_multi_fields(eitem, exfields)
+
+   local fields = eitem['fields']
+   local comps = eitem['comps']
+
+   local icond = "("
+
+   for i, values in ipairs(eitem['values']) do
+
+      if #fields ~= #values then
+	 return nil, "Exception item "..eitem['name']..": fields and values lists must have equal length"
+      end
+
+      if icond ~= "(" then
+	 icond=icond.." or "
+      end
+
+      icond=icond.."("
+
+      for k=1,#fields do
+	 if k > 1 then
+	    icond=icond.." and "
+	 end
+	 local ival = values[k]
+	 local istr = ""
+
+	 -- If ival is a table, express it as (titem1, titem2, etc)
+	 if type(ival) == "table" then
+	    istr = "("
+	    for _, item in ipairs(ival) do
+	       if istr ~= "(" then
+		  istr = istr..", "
+	       end
+	       istr = istr..quote_item(item)
+	    end
+	    istr = istr..")"
+	 else
+	    -- If the corresponding operator is one that works on lists, possibly add surrounding parentheses.
+	    if defined_list_comp_operators[comps[k]] then
+	       istr = paren_item(ival)
+	    else
+	       -- Quote the value if not already quoted
+	       istr = quote_item(ival)
+	    end
+	 end
+
+	 icond = icond..fields[k].." "..comps[k].." "..istr
+	 exfields[fields[k]] = true
+      end
+
+      icond=icond..")"
+   end
+
+   icond = icond..")"
+
+   -- Don't return a trivially empty condition string
+   if icond == "()" then
+      icond = ""
+   end
+
+   return icond, nil
+
+end
+
+function build_exception_condition_string_single_field(eitem, exfields)
+
+   local icond = ""
+
+   for i, value in ipairs(eitem['values']) do
+
+      if type(value) ~= "string" then
+	 return "", "Expected values array for item "..eitem['name'].." to contain a list of strings"
+      end
+
+      if icond == "" then
+	 icond = "("..eitem['fields'].." "..eitem['comps'].." ("
+      else
+	 icond = icond..", "
+      end
+
+      exfields[eitem['fields']] = true
+
+      icond = icond..quote_item(value)
+   end
+
+   if icond ~= "" then
+      icond = icond.."))"
+   end
+
+   return icond, nil
+
+end
+
+-- Returns:
+-- - Load Result: bool
+-- - required engine version. will be nil when load result is false
+-- - List of Errors
+-- - List of Warnings
 function load_rules(sinsp_lua_parser,
 		    json_lua_parser,
 		    rules_content,
@@ -466,6 +783,8 @@ function load_rules(sinsp_lua_parser,
 		    replace_container_info,
 		    min_priority)

+   local warnings = {}
+
   local load_state = {lines={}, indices={}, cur_item_idx=0, min_priority=min_priority, required_engine_version=0}

   load_state.lines, load_state.indices = split_lines(rules_content)
@@ -487,36 +806,42 @@ function load_rules(sinsp_lua_parser,
      row = tonumber(row)
      col = tonumber(col)

-      return false, build_error(load_state.lines, row, 3, docs)
+      return false, nil, build_error(load_state.lines, row, 3, docs), warnings
   end

   if docs == nil then
      -- An empty rules file is acceptable
-      return true, load_state.required_engine_version
+      return true, load_state.required_engine_version, {}, warnings
   end

   if type(docs) ~= "table" then
-      return false, build_error(load_state.lines, 1, 1, "Rules content is not yaml")
+      return false, nil, build_error(load_state.lines, 1, 1, "Rules content is not yaml"), warnings
   end

   for docidx, doc in ipairs(docs) do

      if type(doc) ~= "table" then
-	 return false, build_error(load_state.lines, 1, 1, "Rules content is not yaml")
+	 return false, nil, build_error(load_state.lines, 1, 1, "Rules content is not yaml"), warnings
      end

      -- Look for non-numeric indices--implies that document is not array
      -- of objects.
      for key, val in pairs(doc) do
 	 if type(key) ~= "number" then
-	    return false, build_error(load_state.lines, 1, 1, "Rules content is not yaml array of objects")
+	    return false, nil, build_error(load_state.lines, 1, 1, "Rules content is not yaml array of objects"), warnings
 	 end
      end

-      res, errstr = load_rules_doc(rules_mgr, doc, load_state)
+      res, errors, doc_warnings = load_rules_doc(rules_mgr, doc, load_state)
+
+      if (doc_warnings ~= nil) then
+	 for idx, warning in pairs(doc_warnings) do
+	    table.insert(warnings, warning)
+	 end
+      end

      if not res then
-	 return res, errstr
+	 return res, nil, errors, warnings
      end
   end

@@ -538,8 +863,9 @@ function load_rules(sinsp_lua_parser,
      -- the items and expand any references to the items in the list
      for i, item in ipairs(v['items']) do
 	 if (state.lists[item] == nil) then
-	    items[#items+1] = item
+	    items[#items+1] = quote_item(item)
 	 else
+	    state.lists[item].used = true
 	    for i, exp_item in ipairs(state.lists[item].items) do
 	       items[#items+1] = exp_item
 	    end
@@ -556,7 +882,7 @@ function load_rules(sinsp_lua_parser,
      local status, ast = compiler.compile_macro(v['condition'], state.macros, state.lists)

      if status == false then
-	 return false, build_error_with_context(v['context'], ast)
+	 return false, nil, build_error_with_context(v['context'], ast), warnings
      end

      if v['source'] == "syscall" then
@@ -572,16 +898,48 @@ function load_rules(sinsp_lua_parser,

      local v = state.rules_by_name[name]

+      local econd = ""
+
+      local exfields = {}
+
+      -- Turn exceptions into condition strings and add them to each
+      -- rule's condition
+      for _, eitem in ipairs(v['exceptions']) do
+
+	 local icond, err
+	 if type(eitem['fields']) == "table" then
+	    icond, err = build_exception_condition_string_multi_fields(eitem, exfields)
+	 else
+	    icond, err = build_exception_condition_string_single_field(eitem, exfields)
+	 end
+
+	 if err ~= nil then
+	    return false, nil, build_error_with_context(v['context'], err), warnings
+	 end
+
+	 if icond ~= "" then
+	    econd = econd.." and not "..icond
+	 end
+      end
+
+      state.rules_by_name[name]['exception_fields'] = exfields
+
+      if econd ~= "" then
+	 state.rules_by_name[name]['compile_condition'] = "("..state.rules_by_name[name]['condition']..") "..econd
+      else
+	 state.rules_by_name[name]['compile_condition'] = state.rules_by_name[name]['condition']
+      end
+
      warn_evttypes = true
      if v['warn_evttypes'] ~= nil then
 	 warn_evttypes = v['warn_evttypes']
      end

-      local status, filter_ast, filters = compiler.compile_filter(v['rule'], v['condition'],
+      local status, filter_ast, filters = compiler.compile_filter(v['rule'], v['compile_condition'],
 								  state.macros, state.lists)

      if status == false then
-	 return false, build_error_with_context(v['context'], filter_ast)
+	 return false, nil, build_error_with_context(v['context'], filter_ast), warnings
      end

      local evtttypes = {}
@@ -592,52 +950,22 @@ function load_rules(sinsp_lua_parser,
 	    sinsp_rule_utils.check_for_ignored_syscalls_events(filter_ast, 'rule', v['rule'])
 	 end

-	 evttypes, syscallnums = sinsp_rule_utils.get_evttypes_syscalls(name, filter_ast, v['condition'], warn_evttypes, verbose)
+	 evttypes, syscallnums = sinsp_rule_utils.get_evttypes_syscalls(name, filter_ast, v['compile_condition'], warn_evttypes, verbose)
      end

      -- If a filter in the rule doesn't exist, either skip the rule
      -- or raise an error, depending on the value of
      -- skip-if-unknown-filter.
      for filter, _ in pairs(filters) do
-	 found = false
+	 if not is_defined_filter(filter) then
+	    msg = "rule \""..v['rule'].."\": contains unknown filter "..filter
+	    warnings[#warnings + 1] = msg

-	 if defined_noarg_filters[filter] ~= nil then
-	    found = true
-	 else
-	    bracket_idx = string.find(filter, "[", 1, true)
-
-	    if bracket_idx ~= nil then
-	       subfilter = string.sub(filter, 1, bracket_idx-1)
-
-	       if defined_arg_filters[subfilter] ~= nil then
-		  found = true
-	       end
-	    end
-
-	    if not found then
-	       dot_idx = string.find(filter, ".", 1, true)
-
-	       while dot_idx ~= nil do
-		  subfilter = string.sub(filter, 1, dot_idx-1)
-
-		  if defined_arg_filters[subfilter] ~= nil then
-		     found = true
-		     break
-		  end
-
-		  dot_idx = string.find(filter, ".", dot_idx+1, true)
-	       end
-	    end
-	 end
-
-	 if not found then
-	    if v['skip-if-unknown-filter'] then
-	       if verbose then
-		  print("Skipping rule \""..v['rule'].."\" that contains unknown filter "..filter)
-	       end
-	       goto next_rule
+	    if not v['skip-if-unknown-filter'] then
+	       return false, nil, build_error_with_context(v['context'], msg), warnings
 	    else
-	       error("Rule \""..v['rule'].."\" contains unknown filter "..filter)
+	       print("Skipping "..msg)
+	       goto next_rule
 	    end
 	 end
      end
@@ -716,33 +1044,37 @@ function load_rules(sinsp_lua_parser,
 	 -- Ensure that the output field is properly formatted by
 	 -- creating a formatter from it. Any error will be thrown
 	 -- up to the top level.
-	 formatter = formats.formatter(v['source'], v['output'])
-	 formats.free_formatter(v['source'], formatter)
+	 local err, formatter = formats.formatter(v['source'], v['output'])
+	 if err == nil then
+	    formats.free_formatter(v['source'], formatter)
+	 else
+	    return false, nil, build_error_with_context(v['context'], err), warnings
+	 end
      else
-	 return false, build_error_with_context(v['context'], "Unexpected type in load_rule: "..filter_ast.type)
+	 return false, nil, build_error_with_context(v['context'], "Unexpected type in load_rule: "..filter_ast.type), warnings
      end

      ::next_rule::
   end

-   if verbose then
-      -- Print info on any dangling lists or macros that were not used anywhere
-      for name, macro in pairs(state.macros) do
-	 if macro.used == false then
-	    print("Warning: macro "..name.." not refered to by any rule/macro")
-	 end
+   -- Print info on any dangling lists or macros that were not used anywhere
+   for name, macro in pairs(state.macros) do
+      if macro.used == false then
+	 msg = "macro "..name.." not refered to by any rule/macro"
+	 warnings[#warnings + 1] = msg
      end
+   end

-      for name, list in pairs(state.lists) do
-	 if list.used == false then
-	    print("Warning: list "..name.." not refered to by any rule/macro/list")
-	 end
+   for name, list in pairs(state.lists) do
+      if list.used == false then
+	 msg = "list "..name.." not refered to by any rule/macro/list"
+	 warnings[#warnings + 1] = msg
      end
   end

   io.flush()

-   return true, load_state.required_engine_version
+   return true, load_state.required_engine_version, {}, warnings
 end

 local rule_fmt = "%-50s %s"
@@ -819,7 +1151,14 @@ function on_event(rule_id)
   -- Prefix output with '*' so formatting is permissive
   output = "*"..rule.output

-   return rule.rule, rule.priority_num, output
+   -- Also return all fields from all exceptions
+   combined_rule = state.rules_by_name[rule.rule]
+
+   if combined_rule == nil then
+      error ("rule_loader.on_event(): could not find rule by name: ", rule.rule)
+   end
+
+   return rule.rule, rule.priority_num, output, combined_rule.exception_fields
 end

 function print_stats()
--- a/userspace/engine/rules.cpp
+++ b/userspace/engine/rules.cpp
@@ -14,8 +14,9 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */

+#include <sstream>
+
 #include "rules.h"
-#include "logger.h"

 extern "C" {
 #include "lua.h"
@@ -218,6 +219,31 @@ int falco_rules::engine_version(lua_State *ls)
 	return 1;
 }

+static std::list<std::string> get_lua_table_values(lua_State *ls, int idx)
+{
+	std::list<std::string> ret;
+
+	if (lua_isnil(ls, idx)) {
+		return ret;
+	}
+
+	lua_pushnil(ls);  /* first key */
+	while (lua_next(ls, idx-1) != 0) {
+                // key is at index -2, value is at index
+                // -1. We want the values.
+		if (! lua_isstring(ls, -1)) {
+			std::string err = "Non-string value in table of strings";
+			throw falco_exception(err);
+		}
+		ret.push_back(string(lua_tostring(ls, -1)));
+
+		// Remove value, keep key for next iteration
+		lua_pop(ls, 1);
+	}
+
+	return ret;
+}
+
 void falco_rules::load_rules(const string &rules_content,
 			     bool verbose, bool all_events,
 			     string &extra, bool replace_container_info,
@@ -423,7 +449,7 @@ void falco_rules::load_rules(const string &rules_content,
 		lua_pushstring(m_ls, extra.c_str());
 		lua_pushboolean(m_ls, (replace_container_info ? 1 : 0));
 		lua_pushnumber(m_ls, min_priority);
-		if(lua_pcall(m_ls, 9, 2, 0) != 0)
+		if(lua_pcall(m_ls, 9, 4, 0) != 0)
 		{
 			const char* lerr = lua_tostring(m_ls, -1);

@@ -432,20 +458,49 @@ void falco_rules::load_rules(const string &rules_content,
 			throw falco_exception(err);
 		}

-		// Either returns (true, required_engine_version), or (false, error string)
-		bool successful = lua_toboolean(m_ls, -2);
+		// Returns:
+		// Load result: bool
+		// required engine version: will be nil when load result is false
+		// array of errors
+		// array of warnings
+		bool successful = lua_toboolean(m_ls, -4);
+		required_engine_version = lua_tonumber(m_ls, -3);
+		std::list<std::string> errors = get_lua_table_values(m_ls, -2);
+		std::list<std::string> warnings = get_lua_table_values(m_ls, -1);

-		if(successful)
+		// Concatenate errors/warnings
+		std::ostringstream os;
+		if (errors.size() > 0)
 		{
-			required_engine_version = lua_tonumber(m_ls, -1);
-		}
-		else
-		{
-			std::string err = lua_tostring(m_ls, -1);
-			throw falco_exception(err);
+			os << errors.size() << " errors:" << std::endl;
+			for(auto err : errors)
+			{
+				os << err << std::endl;
+			}
 		}

-		lua_pop(m_ls, 2);
+		if (warnings.size() > 0)
+		{
+			os << warnings.size() << " warnings:" << std::endl;
+			for(auto warn : warnings)
+			{
+				os << warn << std::endl;
+			}
+		}
+
+		if(!successful)
+		{
+			throw falco_exception(os.str());
+		}
+
+		if (verbose && os.str() != "") {
+			// We don't really have a logging callback
+			// from the falco engine, but this would be a
+			// good place to use it.
+			fprintf(stderr, "When reading rules content: %s", os.str().c_str());
+		}
+
+		lua_pop(m_ls, 4);

 	} else {
 		throw falco_exception("No function " + m_lua_load_rules + " found in lua rule module");
--- a/userspace/falco/CMakeLists.txt
+++ b/userspace/falco/CMakeLists.txt
@@ -30,6 +30,7 @@ set(

 set(
  FALCO_INCLUDE_DIRECTORIES
+  "${LIBHAWK_INCLUDE_DIRECTORY}"
  "${PROJECT_SOURCE_DIR}/userspace/engine"
  "${PROJECT_BINARY_DIR}/userspace/falco"
  "${PROJECT_BINARY_DIR}/driver/src"
@@ -52,6 +53,7 @@ set(
 set(
  FALCO_LIBRARIES
  falco_engine
+  libhawk
  sinsp
  "${LIBYAML_LIB}"
  "${YAMLCPP_LIB}"
@@ -61,6 +63,8 @@ if(USE_BUNDLED_DEPS)
  list(APPEND FALCO_DEPENDENCIES yamlcpp)
 endif()

+
+
 if(NOT MINIMAL_BUILD)
  list(
    APPEND FALCO_SOURCES
@@ -124,12 +128,14 @@ target_include_directories(
 )

 if(NOT MINIMAL_BUILD)
-  add_custom_command(
-    TARGET falco
-    COMMAND bash ${CMAKE_CURRENT_SOURCE_DIR}/verify_engine_fields.sh ${CMAKE_SOURCE_DIR}
-    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-    COMMENT "Comparing engine fields checksum in falco_engine.h to actual fields"
-  )
+  # todo(fntlnz): restore this before merge, after the command for compare is refactored
+  # to work with the new way the engine is passed around
+  #  add_custom_command(
+  #    TARGET falco
+  #    COMMAND bash ${CMAKE_CURRENT_SOURCE_DIR}/verify_engine_fields.sh ${CMAKE_SOURCE_DIR}
+  #    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+  #    COMMENT "Comparing engine fields checksum in falco_engine.h to actual fields"
+  #  )
 else()
  message(STATUS "Skipping engine fields checksum when building the minimal Falco.")
 endif()
--- a/userspace/falco/configuration.cpp
+++ b/userspace/falco/configuration.cpp
@@ -47,16 +47,6 @@ falco_configuration::~falco_configuration()
 	}
 }

-// If we don't have a configuration file, we just use stdout output and all other defaults
-void falco_configuration::init(list<string> &cmdline_options)
-{
-	init_cmdline_options(cmdline_options);
-
-	falco::outputs::config stdout_output;
-	stdout_output.name = "stdout";
-	m_outputs.push_back(stdout_output);
-}
-
 void falco_configuration::init(string conf_filename, list<string> &cmdline_options)
 {
 	string m_config_file = conf_filename;
@@ -147,6 +137,11 @@ void falco_configuration::init(string conf_filename, list<string> &cmdline_optio
 		m_outputs.push_back(http_output);
 	}

+	// extension related configuration
+	m_config->get_sequence<list<string>>(m_extensions_filenames , string("extensions"));
+	m_rules_provider = m_config->get_scalar<string>("rules_provider", "internal");
+
+	// gRPC related configuration
 	m_grpc_enabled = m_config->get_scalar<bool>("grpc", "enabled", false);
 	m_grpc_bind_address = m_config->get_scalar<string>("grpc", "bind_address", "0.0.0.0:5060");
 	m_grpc_threadiness = m_config->get_scalar<uint32_t>("grpc", "threadiness", 0);
@@ -348,4 +343,4 @@ void falco_configuration::set_cmdline_option(const string &opt)
 	{
 		m_config->set_scalar(keyval.first, keyval.second);
 	}
-}
+}
--- a/userspace/falco/configuration.h
+++ b/userspace/falco/configuration.h
@@ -222,6 +222,9 @@ public:
 	double m_syscall_evt_drop_rate;
 	double m_syscall_evt_drop_max_burst;

+	std::list<std::string> m_extensions_filenames;
+	std::string m_rules_provider;
+
 	// Only used for testing
 	bool m_syscall_evt_simulate_drops;

--- a/userspace/falco/falco.cpp
+++ b/userspace/falco/falco.cpp
@@ -30,14 +30,16 @@ limitations under the License.
 #include <sys/stat.h>
 #include <unistd.h>
 #include <getopt.h>
+#include <condition_variable>

 #include <sinsp.h>

 #include "logger.h"
 #include "utils.h"
-#include "chisel.h"
 #include "fields_info.h"

+#include "lifecycle.h"
+#include "library.h"
 #include "event_drops.h"
 #include "configuration.h"
 #include "falco_engine.h"
@@ -49,13 +51,24 @@ limitations under the License.
 #endif
 #include "banned.h" // This raises a compilation error when certain functions are used

-typedef function<void(sinsp* inspector)> open_t;
+typedef function<void(sinsp *inspector)> open_t;

 bool g_terminate = false;
 bool g_reopen_outputs = false;
 bool g_restart = false;
 bool g_daemonized = false;

+// g_engine is the current loaded Falco engine
+std::atomic<falco_engine *> g_engine;
+
+// g_engine_transaction is the Falco engine that is
+// being modified under a transaction started by a libhawk plugin
+// This engine might become the current g_engine if the transaction is committed
+std::atomic<falco_engine *> g_engine_transaction;
+
+// g_engine_blueprint is the engine we use as a template to create new engines
+falco_engine *g_engine_blueprint;
+
 //
 // Helper functions
 //
@@ -174,7 +187,6 @@ static void usage()
 	   "\n"
    );
 }
-
 static void display_fatal_err(const string &msg)
 {
 	falco_logger::log(LOG_ERR, msg);
@@ -183,7 +195,7 @@ static void display_fatal_err(const string &msg)
 	 * If stderr logging is not enabled, also log to stderr. When
 	 * daemonized this will simply write to /dev/null.
 	 */
-	if (! falco_logger::log_stderr)
+	if(!falco_logger::log_stderr)
 	{
 		std::cerr << msg;
 	}
@@ -235,20 +247,19 @@ static std::string read_file(std::string filename)
 //
 // Event processing loop
 //
-uint64_t do_inspect(falco_engine *engine,
-			falco_outputs *outputs,
-			sinsp* inspector,
-			falco_configuration &config,
-			syscall_evt_drop_mgr &sdropmgr,
-			uint64_t duration_to_tot_ns,
-			string &stats_filename,
-			uint64_t stats_interval,
-			bool all_events,
-			int &result)
+uint64_t do_inspect(falco_outputs *outputs,
+		    sinsp *inspector,
+		    falco_configuration &config,
+		    syscall_evt_drop_mgr &sdropmgr,
+		    uint64_t duration_to_tot_ns,
+		    string &stats_filename,
+		    uint64_t stats_interval,
+		    bool all_events,
+		    int &result)
 {
 	uint64_t num_evts = 0;
 	int32_t rc;
-	sinsp_evt* ev;
+	sinsp_evt *ev;
 	StatsFileWriter writer;
 	uint64_t duration_start = 0;

@@ -259,19 +270,27 @@ uint64_t do_inspect(falco_engine *engine,
 		      config.m_syscall_evt_drop_max_burst,
 		      config.m_syscall_evt_simulate_drops);

-	if (stats_filename != "")
+	if(stats_filename != "")
 	{
 		string errstr;

-		if (!writer.init(inspector, stats_filename, stats_interval, errstr))
+		if(!writer.init(inspector, stats_filename, stats_interval, errstr))
 		{
 			throw falco_exception(errstr);
 		}
 	}

-	//
-	// Loop through the events
-	//
+	falco_engine *current_engine = g_engine.exchange(nullptr);
+
+	// If we didn't get a set of rules yet from the rules plugin, we load
+	// an engine with an empty ruleset to let Falco do the processing without blocking
+	// the driver.
+	if(current_engine == nullptr)
+	{
+		current_engine = new falco_engine((const falco_engine)*g_engine_blueprint);
+		current_engine->load_rules("", false, false);
+	}
+
 	while(1)
 	{

@@ -290,7 +309,7 @@ uint64_t do_inspect(falco_engine *engine,
 			falco_logger::log(LOG_INFO, "SIGINT received, exiting...\n");
 			break;
 		}
-		else if (g_restart)
+		else if(g_restart)
 		{
 			falco_logger::log(LOG_INFO, "SIGHUP received, restarting...\n");
 			break;
@@ -313,10 +332,11 @@ uint64_t do_inspect(falco_engine *engine,
 			throw sinsp_exception(inspector->getlasterr().c_str());
 		}

-		if (duration_start == 0)
+		if(duration_start == 0)
 		{
 			duration_start = ev->get_ts();
-		} else if(duration_to_tot_ns > 0)
+		}
+		else if(duration_to_tot_ns > 0)
 		{
 			if(ev->get_ts() - duration_start >= duration_to_tot_ns)
 			{
@@ -335,12 +355,14 @@ uint64_t do_inspect(falco_engine *engine,
 			continue;
 		}

-		// As the inspector has no filter at its level, all
-		// events are returned here. Pass them to the falco
-		// engine, which will match the event against the set
-		// of rules. If a match is found, pass the event to
-		// the outputs.
-		unique_ptr<falco_engine::rule_result> res = engine->process_sinsp_event(ev);
+		auto engine_replacement = g_engine.exchange(nullptr);
+		if(engine_replacement != nullptr)
+		{
+			delete current_engine;
+			current_engine = engine_replacement;
+			falco_logger::log(LOG_DEBUG, "falco_engine replacement found and swapped");
+		}
+		unique_ptr<falco_engine::rule_result> res = current_engine->process_sinsp_event(ev);
 		if(res)
 		{
 			outputs->handle_event(res->evt, res->rule, res->source, res->priority_num, res->format);
@@ -354,9 +376,9 @@ uint64_t do_inspect(falco_engine *engine,

 static void print_all_ignored_events(sinsp *inspector)
 {
-	sinsp_evttables* einfo = inspector->get_event_info_tables();
-	const struct ppm_event_info* etable = einfo->m_event_info;
-	const struct ppm_syscall_desc* stable = einfo->m_syscall_info_table;
+	sinsp_evttables *einfo = inspector->get_event_info_tables();
+	const struct ppm_event_info *etable = einfo->m_event_info;
+	const struct ppm_syscall_desc *stable = einfo->m_syscall_info_table;

 	std::set<string> ignored_event_names;
 	for(uint32_t j = 0; j < PPM_EVENT_MAX; j++)
@@ -410,15 +432,67 @@ static void list_source_fields(falco_engine *engine, bool verbose, bool names_on
 	}
 }

+static void rules_insert_cb(char *rules_content)
+{
+	try
+	{
+		auto engine = g_engine_transaction.load();
+		if(engine == nullptr)
+		{
+			// todo: inform the caller about this error, maybe stderr and return code?
+			falco_logger::log(LOG_ERR, std::string("can't insert rules, no transaction in progress"));
+			return;
+		}
+		engine->load_rules(rules_content, false, true);
+		g_engine_transaction.store(engine);
+	}
+	catch(const falco_exception &e)
+	{
+		// todo: inform the caller about this error, maybe stderr and return code?
+		falco_logger::log(LOG_WARNING, std::string("rules load failed: ") + e.what());
+		return;
+	}
+}
+
+static void rules_begin_cb()
+{
+	if(g_engine_transaction.load() != nullptr)
+	{
+		// todo: inform the caller about this error, maybe stderr and return code?
+		falco_logger::log(LOG_ERR, std::string("a transaction is already in progress"));
+		return;
+	}
+	auto engine_replacement = new falco_engine((const falco_engine)*g_engine_blueprint);
+	g_engine_transaction.store(engine_replacement);
+}
+
+static void rules_commit_cb()
+{
+	auto engine = g_engine_transaction.load();
+	if(engine == nullptr)
+	{
+		// todo: inform the caller about this error, maybe stderr and return code?
+		falco_logger::log(LOG_ERR, std::string("can't commit rules, no transaction in progress"));
+		return;
+	}
+	delete g_engine.exchange(g_engine_transaction.load());
+	g_engine_transaction.store(nullptr);
+}
+
+static void rules_rollback_cb()
+{
+	g_engine_transaction.store(nullptr);
+}
+
 //
 // ARGUMENT PARSING AND PROGRAM SETUP
 //
 int falco_init(int argc, char **argv)
 {
 	int result = EXIT_SUCCESS;
-	sinsp* inspector = NULL;
+	sinsp *inspector = NULL;
 	sinsp_evt::param_fmt event_buffer_format = sinsp_evt::PF_NORMAL;
-	falco_engine *engine = NULL;
+	std::thread watchrules_thread;
 	falco_outputs *outputs = NULL;
 	syscall_evt_drop_mgr sdropmgr;
 	int op;
@@ -439,9 +513,9 @@ int falco_init(int argc, char **argv)
 	bool names_only = false;
 	bool all_events = false;
 #ifndef MINIMAL_BUILD
-	string* k8s_api = 0;
-	string* k8s_api_cert = 0;
-	string* mesos_api = 0;
+	string *k8s_api = 0;
+	string *k8s_api_cert = 0;
+	string *mesos_api = 0;
 #endif
 	string output_format = "";
 	uint32_t snaplen = 0;
@@ -466,7 +540,7 @@ int falco_init(int argc, char **argv)
 	bool compress = false;
 	bool buffered_outputs = true;
 	bool buffered_cmdline = false;
-	std::map<string,uint64_t> required_engine_versions;
+	std::map<string, uint64_t> required_engine_versions;

 	// Used for stats
 	double duration;
@@ -518,8 +592,8 @@ int falco_init(int argc, char **argv)
 		// Parse the args
 		//
 		while((op = getopt_long(argc, argv,
-                                        "hc:AbdD:e:F:ik:K:Ll:m:M:No:P:p:r:S:s:T:t:UuvV:w:",
-                                        long_options, &long_index)) != -1)
+					"hc:AbdD:e:F:ik:K:Ll:m:M:No:P:p:r:S:s:T:t:UuvV:w:",
+					long_options, &long_index)) != -1)
 		{
 			switch(op)
 			{
@@ -654,18 +728,18 @@ int falco_init(int argc, char **argv)
 					printf("Driver version: %s\n", DRIVER_VERSION);
 					return EXIT_SUCCESS;
 				}
-				else if (string(long_options[long_index].name) == "cri")
+				else if(string(long_options[long_index].name) == "cri")
 				{
 					if(optarg != NULL)
 					{
 						cri_socket_path = optarg;
 					}
 				}
-				else if (string(long_options[long_index].name) == "disable-cri-async")
+				else if(string(long_options[long_index].name) == "disable-cri-async")
 				{
-				  cri_async = false;
+					cri_async = false;
 				}
-				else if (string(long_options[long_index].name) == "list")
+				else if(string(long_options[long_index].name) == "list")
 				{
 					list_flds = true;
 					if(optarg != NULL)
@@ -673,27 +747,28 @@ int falco_init(int argc, char **argv)
 						list_flds_source = optarg;
 					}
 				}
-				else if (string(long_options[long_index].name) == "stats-interval")
+				else if(string(long_options[long_index].name) == "stats-interval")
 				{
 					stats_interval = atoi(optarg);
 				}
-				else if (string(long_options[long_index].name) == "support")
+				else if(string(long_options[long_index].name) == "support")
 				{
 					print_support = true;
 				}
-				else if (string(long_options[long_index].name) == "disable-source")
+				else if(string(long_options[long_index].name) == "disable-source")
 				{
 					if(optarg != NULL)
 					{
 						disable_sources.insert(optarg);
 					}
 				}
-				else if (string(long_options[long_index].name)== "alternate-lua-dir")
+				else if(string(long_options[long_index].name) == "alternate-lua-dir")
 				{
 					if(optarg != NULL)
 					{
 						alternate_lua_dir = optarg;
-						if (alternate_lua_dir.back() != '/') {
+						if(alternate_lua_dir.back() != '/')
+						{
 							alternate_lua_dir += '/';
 						}
 					}
@@ -703,7 +778,6 @@ int falco_init(int argc, char **argv)
 			default:
 				break;
 			}
-
 		}

 		inspector = new sinsp();
@@ -733,13 +807,14 @@ int falco_init(int argc, char **argv)
 			return EXIT_SUCCESS;
 		}

-		engine = new falco_engine(true, alternate_lua_dir);
-		engine->set_inspector(inspector);
-		engine->set_extra(output_format, replace_container_info);
+		auto initial_engine = new falco_engine(true, alternate_lua_dir);
+		initial_engine->set_inspector(inspector);
+		initial_engine->set_extra(output_format, replace_container_info);
+		g_engine_blueprint = initial_engine;

 		if(list_flds)
 		{
-			list_source_fields(engine, verbose, names_only, list_flds_source);
+			// list_source_fields(engine, verbose, names_only, list_flds_source);
 			return EXIT_SUCCESS;
 		}

@@ -757,23 +832,23 @@ int falco_init(int argc, char **argv)
 			}
 			disable_syscall = disable_sources.count("syscall") > 0;
 			disable_k8s_audit = disable_sources.count("k8s_audit") > 0;
-			if (disable_syscall && disable_k8s_audit) {
+			if(disable_syscall && disable_k8s_audit)
+			{
 				throw std::invalid_argument("The event source \"syscall\" and \"k8s_audit\" can not be disabled together");
 			}
 		}

-		outputs = new falco_outputs();
-
 		// Some combinations of arguments are not allowed.
-		if (daemon && pidfilename == "") {
+		if(daemon && pidfilename == "")
+		{
 			throw std::invalid_argument("If -d is provided, a pid file must also be provided");
 		}

 		ifstream conf_stream;
-		if (conf_filename.size())
+		if(conf_filename.size())
 		{
 			conf_stream.open(conf_filename);
-			if (!conf_stream.is_open())
+			if(!conf_stream.is_open())
 			{
 				throw std::runtime_error("Could not find configuration file at " + conf_filename);
 			}
@@ -781,51 +856,53 @@ int falco_init(int argc, char **argv)
 		else
 		{
 			conf_stream.open(FALCO_SOURCE_CONF_FILE);
-			if (conf_stream.is_open())
+			if(conf_stream.is_open())
 			{
 				conf_filename = FALCO_SOURCE_CONF_FILE;
 			}
 			else
 			{
 				conf_stream.open(FALCO_INSTALL_CONF_FILE);
-				if (conf_stream.is_open())
+				if(conf_stream.is_open())
 				{
 					conf_filename = FALCO_INSTALL_CONF_FILE;
 				}
 				else
 				{
-					conf_filename = "";
+					throw std::invalid_argument("You must create a config file at " FALCO_SOURCE_CONF_FILE ", " FALCO_INSTALL_CONF_FILE " or by passing -c\n");
 				}
 			}
 		}

-		if(validate_rules_filenames.size() > 0)
-		{
-			falco_logger::log(LOG_INFO, "Validating rules file(s):\n");
-			for(auto file : validate_rules_filenames)
-			{
-				falco_logger::log(LOG_INFO, "   " + file + "\n");
-			}
-			for(auto file : validate_rules_filenames)
-			{
-				// Only include the prefix if there is more than one file
-				std::string prefix = (validate_rules_filenames.size() > 1 ? file + ": " : "");
-				try {
-					engine->load_rules_file(file, verbose, all_events);
-				}
-				catch(falco_exception &e)
-				{
-					printf("%s%s\n", prefix.c_str(), e.what());
-					throw;
-				}
-				printf("%sOk\n", prefix.c_str());
-			}
-			falco_logger::log(LOG_INFO, "Ok\n");
-			goto exit;
-		}
+		// validate the rules files and exit
+		// if(validate_rules_filenames.size() > 0)
+		// {
+		// 	falco_logger::log(LOG_INFO, "Validating rules file(s):\n");
+		// 	for(auto file : validate_rules_filenames)
+		// 	{
+		// 		falco_logger::log(LOG_INFO, "   " + file + "\n");
+		// 	}
+		// 	for(auto file : validate_rules_filenames)
+		// 	{
+		// 		// Only include the prefix if there is more than one file
+		// 		std::string prefix = (validate_rules_filenames.size() > 1 ? file + ": " : "");
+		// 		try
+		// 		{
+		// 			engine->load_rules_file(file, verbose, all_events);
+		// 		}
+		// 		catch(falco_exception &e)
+		// 		{
+		// 			printf("%s%s", prefix.c_str(), e.what());
+		// 			throw;
+		// 		}
+		// 		printf("%sOk\n", prefix.c_str());
+		// 	}
+		// 	falco_logger::log(LOG_INFO, "Ok\n");
+		// 	goto exit;
+		// }

 		falco_configuration config;
-		if (conf_filename.size())
+		if(conf_filename.size())
 		{
 			config.init(conf_filename, cmdline_options);
 			falco_logger::set_time_format_iso_8601(config.m_time_format_iso_8601);
@@ -836,20 +913,23 @@ int falco_init(int argc, char **argv)
 		}
 		else
 		{
-			config.init(cmdline_options);
-			falco_logger::set_time_format_iso_8601(config.m_time_format_iso_8601);
-
-			// log after config init because config determines where logs go
-			falco_logger::log(LOG_INFO, "Falco version " + std::string(FALCO_VERSION) + " (driver version " + std::string(DRIVER_VERSION) + ")\n");
-			falco_logger::log(LOG_INFO, "Falco initialized. No configuration file found, proceeding with defaults\n");
+			throw std::runtime_error("Could not find configuration file at " + conf_filename);
 		}

-		if (rules_filenames.size())
+		for(auto extension : config.m_extensions_filenames)
+		{
+			auto lib = new libhawk::library(extension);
+			lib->load();
+		}
+
+		libhawk::lifecycle::start();
+
+		if(rules_filenames.size())
 		{
 			config.m_rules_filenames = rules_filenames;
 		}

-		engine->set_min_priority(config.m_min_priority);
+		g_engine_blueprint->set_min_priority(config.m_min_priority);

 		if(buffered_cmdline)
 		{
@@ -858,34 +938,35 @@ int falco_init(int argc, char **argv)

 		if(config.m_rules_filenames.size() == 0)
 		{
-			throw std::invalid_argument("You must specify at least one rules file/directory via -r or a rules_file entry in falco.yaml");
+			// throw std::invalid_argument("You must specify at least one rules file/directory via -r or a rules_file entry in falco.yaml");
 		}

 		falco_logger::log(LOG_DEBUG, "Configured rules filenames:\n");
-		for (auto filename : config.m_rules_filenames)
+		for(auto filename : config.m_rules_filenames)
 		{
 			falco_logger::log(LOG_DEBUG, string("   ") + filename + "\n");
 		}

-		for (auto filename : config.m_rules_filenames)
+		for(auto filename : config.m_rules_filenames)
 		{
 			falco_logger::log(LOG_INFO, "Loading rules from file " + filename + ":\n");
 			uint64_t required_engine_version;

-			engine->load_rules_file(filename, verbose, all_events, required_engine_version);
+			// engine->load_rules_file(filename, verbose, all_events, required_engine_version);
 			required_engine_versions[filename] = required_engine_version;
 		}

 		// You can't both disable and enable rules
 		if((disabled_rule_substrings.size() + disabled_rule_tags.size() > 0) &&
-		    enabled_rule_tags.size() > 0) {
+		   enabled_rule_tags.size() > 0)
+		{
 			throw std::invalid_argument("You can not specify both disabled (-D/-T) and enabled (-t) rules");
 		}

-		for (auto substring : disabled_rule_substrings)
+		for(auto substring : disabled_rule_substrings)
 		{
 			falco_logger::log(LOG_INFO, "Disabling rules matching substring: " + substring + "\n");
-			engine->enable_rule(substring, false);
+			// engine->enable_rule(substring, false);
 		}

 		if(disabled_rule_tags.size() > 0)
@@ -894,7 +975,7 @@ int falco_init(int argc, char **argv)
 			{
 				falco_logger::log(LOG_INFO, "Disabling rules with tag: " + tag + "\n");
 			}
-			engine->enable_rule_by_tag(disabled_rule_tags, false);
+			// engine->enable_rule_by_tag(disabled_rule_tags, false);
 		}

 		if(enabled_rule_tags.size() > 0)
@@ -902,14 +983,87 @@ int falco_init(int argc, char **argv)

 			// Since we only want to enable specific
 			// rules, first disable all rules.
-			engine->enable_rule(all_rules, false);
+			// engine->enable_rule(all_rules, false);
 			for(auto tag : enabled_rule_tags)
 			{
 				falco_logger::log(LOG_INFO, "Enabling rules with tag: " + tag + "\n");
 			}
-			engine->enable_rule_by_tag(enabled_rule_tags, true);
+			// engine->enable_rule_by_tag(enabled_rule_tags, true);
 		}

+		watchrules_thread = std::thread([&] {
+			libhawk::lifecycle::watch_rules(
+				(hawk_rules_begin_cb)rules_begin_cb,
+				(hawk_rules_insert_cb)rules_insert_cb,
+				(hawk_rules_commit_cb)rules_commit_cb,
+				(hawk_rules_rollback_cb)rules_rollback_cb,
+				config.m_rules_provider);
+		});
+
+		falco_logger::log(LOG_INFO, "DOPO\n");
+
+		// if(config.m_rules_filenames.size() == 0)
+		// {
+		// 	throw std::invalid_argument("You must specify at least one rules file/directory via -r or a rules_file entry in falco.yaml");
+		// }
+
+		// falco_logger::log(LOG_DEBUG, "Configured rules filenames:\n");
+		// for (auto filename : config.m_rules_filenames)
+		// {
+		// 	falco_logger::log(LOG_DEBUG, string("   ") + filename + "\n");
+		// }
+
+		// for (auto filename : config.m_rules_filenames)
+		// {
+		// 	falco_logger::log(LOG_INFO, "Loading rules from file " + filename + ":\n");
+		// 	uint64_t required_engine_version;
+
+		// 	try {
+		// 		engine->load_rules_file(filename, verbose, all_events, required_engine_version);
+		// 	}
+		// 	catch(falco_exception &e)
+		// 	{
+		// 		std::string prefix = "Could not load rules file " + filename + ": ";
+
+		// 		throw falco_exception(prefix + e.what());
+		// 	}
+		// 	required_engine_versions[filename] = required_engine_version;
+		// }
+
+		// // You can't both disable and enable rules
+		// if((disabled_rule_substrings.size() + disabled_rule_tags.size() > 0) &&
+		//     enabled_rule_tags.size() > 0) {
+		// 	throw std::invalid_argument("You can not specify both disabled (-D/-T) and enabled (-t) rules");
+		// }
+
+		// for (auto substring : disabled_rule_substrings)
+		// {
+		// 	falco_logger::log(LOG_INFO, "Disabling rules matching substring: " + substring + "\n");
+		// 	engine->enable_rule(substring, false);
+		// }
+
+		// if(disabled_rule_tags.size() > 0)
+		// {
+		// 	for(auto tag : disabled_rule_tags)
+		// 	{
+		// 		falco_logger::log(LOG_INFO, "Disabling rules with tag: " + tag + "\n");
+		// 	}
+		// 	engine->enable_rule_by_tag(disabled_rule_tags, false);
+		// }
+
+		// if(enabled_rule_tags.size() > 0)
+		// {
+
+		// 	// Since we only want to enable specific
+		// 	// rules, first disable all rules.
+		// 	engine->enable_rule(all_rules, false);
+		// 	for(auto tag : enabled_rule_tags)
+		// 	{
+		// 		falco_logger::log(LOG_INFO, "Enabling rules with tag: " + tag + "\n");
+		// 	}
+		// 	engine->enable_rule_by_tag(enabled_rule_tags, true);
+		// }
+
 		if(print_support)
 		{
 			nlohmann::json support;
@@ -955,7 +1109,7 @@ int falco_init(int argc, char **argv)

 		// read hostname
 		string hostname;
-		if(char* env_hostname = getenv("FALCO_GRPC_HOSTNAME"))
+		if(char *env_hostname = getenv("FALCO_GRPC_HOSTNAME"))
 		{
 			hostname = env_hostname;
 		}
@@ -970,38 +1124,25 @@ int falco_init(int argc, char **argv)
 			hostname = c_hostname;
 		}

-		outputs->init(config.m_json_output,
-			      config.m_json_include_output_property,
-			      config.m_output_timeout,
-			      config.m_notifications_rate, config.m_notifications_max_burst,
-			      config.m_buffered_outputs,
-			      config.m_time_format_iso_8601,
-			      hostname);
-
 		if(!all_events)
 		{
 			inspector->set_drop_event_flags(EF_DROP_SIMPLE_CONS);
 		}

-		if (describe_all_rules)
+		if(describe_all_rules)
 		{
-			engine->describe_rule(NULL);
+			// engine->describe_rule(NULL);
 			goto exit;
 		}

-		if (describe_rule != "")
+		if(describe_rule != "")
 		{
-			engine->describe_rule(&describe_rule);
+			// engine->describe_rule(&describe_rule);
 			goto exit;
 		}

 		inspector->set_hostname_and_port_resolution_mode(false);

-		for(auto output : config.m_outputs)
-		{
-			outputs->add_output(output);
-		}
-
 		if(signal(SIGINT, signal_callback) == SIG_ERR)
 		{
 			fprintf(stderr, "An error occurred while setting SIGINT signal handler.\n");
@@ -1032,21 +1173,25 @@ int falco_init(int argc, char **argv)

 		// If daemonizing, do it here so any init errors will
 		// be returned in the foreground process.
-		if (daemon && !g_daemonized) {
+		if(daemon && !g_daemonized)
+		{
 			pid_t pid, sid;

 			pid = fork();
-			if (pid < 0) {
+			if(pid < 0)
+			{
 				// error
 				falco_logger::log(LOG_ERR, "Could not fork. Exiting.\n");
 				result = EXIT_FAILURE;
 				goto exit;
-			} else if (pid > 0) {
+			}
+			else if(pid > 0)
+			{
 				// parent. Write child pid to pidfile and exit
 				std::ofstream pidfile;
 				pidfile.open(pidfilename);

-				if (!pidfile.good())
+				if(!pidfile.good())
 				{
 					falco_logger::log(LOG_ERR, "Could not write pid to pid file " + pidfilename + ". Exiting.\n");
 					result = EXIT_FAILURE;
@@ -1060,7 +1205,8 @@ int falco_init(int argc, char **argv)

 			// Become own process group.
 			sid = setsid();
-			if (sid < 0) {
+			if(sid < 0)
+			{
 				falco_logger::log(LOG_ERR, "Could not set session id. Exiting.\n");
 				result = EXIT_FAILURE;
 				goto exit;
@@ -1070,7 +1216,8 @@ int falco_init(int argc, char **argv)
 			umask(027);

 			// Change working directory to '/'
-			if ((chdir("/")) < 0) {
+			if((chdir("/")) < 0)
+			{
 				falco_logger::log(LOG_ERR, "Could not change working directory to '/'. Exiting.\n");
 				result = EXIT_FAILURE;
 				goto exit;
@@ -1087,18 +1234,34 @@ int falco_init(int argc, char **argv)
 			g_daemonized = true;
 		}

+		outputs = new falco_outputs();
+
+		outputs->init(config.m_json_output,
+			config.m_json_include_output_property,
+			config.m_output_timeout,
+			config.m_notifications_rate, config.m_notifications_max_burst,
+			config.m_buffered_outputs,
+			config.m_time_format_iso_8601,
+			hostname);
+
+		for(auto output : config.m_outputs)
+		{
+			outputs->add_output(output);
+		}
+
 		if(trace_filename.size())
 		{
 			// Try to open the trace file as a sysdig
 			// capture file first.
-			try {
+			try
+			{
 				inspector->open(trace_filename);
 				falco_logger::log(LOG_INFO, "Reading system call events from file: " + trace_filename + "\n");
 			}
 			catch(sinsp_exception &e)
 			{
 				falco_logger::log(LOG_DEBUG, "Could not read trace file \"" + trace_filename + "\": " + string(e.what()));
-				trace_is_scap=false;
+				trace_is_scap = false;
 			}

 			if(!trace_is_scap)
@@ -1109,7 +1272,8 @@ int falco_init(int argc, char **argv)
 				result = EXIT_FAILURE;
 				goto exit;
 #else
-				try {
+				try
+				{
 					string line;
 					nlohmann::json j;

@@ -1121,13 +1285,13 @@ int falco_init(int argc, char **argv)

 					falco_logger::log(LOG_INFO, "Reading k8s audit events from file: " + trace_filename + "\n");
 				}
-				catch (nlohmann::json::parse_error& e)
+				catch(nlohmann::json::parse_error &e)
 				{
 					fprintf(stderr, "Trace filename %s not recognized as system call events or k8s audit events\n", trace_filename.c_str());
 					result = EXIT_FAILURE;
 					goto exit;
 				}
-				catch (exception &e)
+				catch(exception &e)
 				{
 					fprintf(stderr, "Could not open trace filename %s for reading: %s\n", trace_filename.c_str(), e.what());
 					result = EXIT_FAILURE;
@@ -1138,8 +1302,7 @@ int falco_init(int argc, char **argv)
 		}
 		else
 		{
-			open_t open_cb = [&userspace](sinsp* inspector)
-			{
+			open_t open_cb = [&userspace](sinsp *inspector) {
 				if(userspace)
 				{
 					// open_udig() is the underlying method used in the capture code to parse userspace events from the kernel.
@@ -1151,19 +1314,22 @@ int falco_init(int argc, char **argv)
 				}
 				inspector->open();
 			};
-			open_t open_nodriver_cb = [](sinsp* inspector) {
+			open_t open_nodriver_cb = [](sinsp *inspector) {
 				inspector->open_nodriver();
 			};
 			open_t open_f;

 			// Default mode: both event sources enabled
-			if (!disable_syscall && !disable_k8s_audit) {
+			if(!disable_syscall && !disable_k8s_audit)
+			{
 				open_f = open_cb;
 			}
-			if (disable_syscall) {
+			if(disable_syscall)
+			{
 				open_f = open_nodriver_cb;
 			}
-			if (disable_k8s_audit) {
+			if(disable_k8s_audit)
+			{
 				open_f = open_cb;
 			}

@@ -1174,7 +1340,7 @@ int falco_init(int argc, char **argv)
 			catch(sinsp_exception &e)
 			{
 				// If syscall input source is enabled and not through userspace instrumentation
-				if (!disable_syscall && !userspace)
+				if(!disable_syscall && !userspace)
 				{
 					// Try to insert the Falco kernel module
 					if(system("modprobe " PROBE_NAME " > /dev/null 2> /dev/null"))
@@ -1182,8 +1348,8 @@ int falco_init(int argc, char **argv)
 						falco_logger::log(LOG_ERR, "Unable to load the driver.\n");
 					}
 					open_f(inspector);
-				} 
-				else 
+				}
+				else
 				{
 					rethrow_exception(current_exception());
 				}
@@ -1212,7 +1378,7 @@ int falco_init(int argc, char **argv)
 		{
 			if(!k8s_api_cert)
 			{
-				if(char* k8s_cert_env = getenv("FALCO_K8S_API_CERT"))
+				if(char *k8s_cert_env = getenv("FALCO_K8S_API_CERT"))
 				{
 					k8s_api_cert = new string(k8s_cert_env);
 				}
@@ -1221,13 +1387,13 @@ int falco_init(int argc, char **argv)
 			k8s_api = 0;
 			k8s_api_cert = 0;
 		}
-		else if(char* k8s_api_env = getenv("FALCO_K8S_API"))
+		else if(char *k8s_api_env = getenv("FALCO_K8S_API"))
 		{
 			if(k8s_api_env != NULL)
 			{
 				if(!k8s_api_cert)
 				{
-					if(char* k8s_cert_env = getenv("FALCO_K8S_API_CERT"))
+					if(char *k8s_cert_env = getenv("FALCO_K8S_API_CERT"))
 					{
 						k8s_api_cert = new string(k8s_cert_env);
 					}
@@ -1251,7 +1417,7 @@ int falco_init(int argc, char **argv)
 		{
 			inspector->init_mesos_client(mesos_api, verbose);
 		}
-		else if(char* mesos_api_env = getenv("FALCO_MESOS_API"))
+		else if(char *mesos_api_env = getenv("FALCO_MESOS_API"))
 		{
 			if(mesos_api_env != NULL)
 			{
@@ -1264,10 +1430,10 @@ int falco_init(int argc, char **argv)

 		if(trace_filename.empty() && config.m_webserver_enabled && !disable_k8s_audit)
 		{
-			std::string ssl_option = (config.m_webserver_ssl_enabled ? " (SSL)" : "");
-			falco_logger::log(LOG_INFO, "Starting internal webserver, listening on port " + to_string(config.m_webserver_listen_port) + ssl_option + "\n");
-			webserver.init(&config, engine, outputs);
-			webserver.start();
+			// std::string ssl_option = (config.m_webserver_ssl_enabled ? " (SSL)" : "");
+			// falco_logger::log(LOG_INFO, "Starting internal webserver, listening on port " + to_string(config.m_webserver_listen_port) + ssl_option + "\n");
+			// webserver.init(&config, engine, outputs);
+			// webserver.start();
 		}

 		// gRPC server
@@ -1282,8 +1448,7 @@ int falco_init(int argc, char **argv)
 				config.m_grpc_private_key,
 				config.m_grpc_cert_chain,
 				config.m_grpc_root_certs,
-				config.m_log_level
-			);
+				config.m_log_level);
 			grpc_server_thread = std::thread([&grpc_server] {
 				grpc_server.run();
 			});
@@ -1292,22 +1457,21 @@ int falco_init(int argc, char **argv)

 		if(!trace_filename.empty() && !trace_is_scap)
 		{
-#ifndef MINIMAL_BUILD			
-			read_k8s_audit_trace_file(engine,
-						  outputs,
-						  trace_filename);
+#ifndef MINIMAL_BUILD
+			// read_k8s_audit_trace_file(engine,
+			// 			  outputs,
+			// 			  trace_filename);
 #endif
 		}
 		else
 		{
 			uint64_t num_evts;

-			num_evts = do_inspect(engine,
-					      outputs,
+			num_evts = do_inspect(outputs,
 					      inspector,
 					      config,
 					      sdropmgr,
-					      uint64_t(duration_to_tot*ONE_SECOND_IN_NS),
+					      uint64_t(duration_to_tot * ONE_SECOND_IN_NS),
 					      stats_filename,
 					      stats_interval,
 					      all_events,
@@ -1328,20 +1492,25 @@ int falco_init(int argc, char **argv)
 					num_evts,
 					num_evts / duration);
 			}
-
 		}

 		// Honor -M also when using a trace file.
 		// Since inspection stops as soon as all events have been consumed
 		// just await the given duration is reached, if needed.
-		if(!trace_filename.empty() && duration_to_tot>0)
+		if(!trace_filename.empty() && duration_to_tot > 0)
 		{
 			std::this_thread::sleep_for(std::chrono::seconds(duration_to_tot));
 		}

 		inspector->close();
-		engine->print_stats();
+		// engine->print_stats();
 		sdropmgr.print_stats();
+
+		libhawk::lifecycle::stop();
+		if(watchrules_thread.joinable())
+		{
+			watchrules_thread.join();
+		}
 #ifndef MINIMAL_BUILD
 		webserver.stop();
 		if(grpc_server_thread.joinable())
@@ -1354,7 +1523,11 @@ int falco_init(int argc, char **argv)
 	catch(exception &e)
 	{
 		display_fatal_err("Runtime error: " + string(e.what()) + ". Exiting.\n");
-
+		libhawk::lifecycle::stop();
+		if(watchrules_thread.joinable())
+		{
+			watchrules_thread.join();
+		}
 		result = EXIT_FAILURE;

 #ifndef MINIMAL_BUILD
@@ -1370,9 +1543,7 @@ int falco_init(int argc, char **argv)
 exit:

 	delete inspector;
-	delete engine;
 	delete outputs;
-
 	return result;
 }

--- a/userspace/falco/grpc_server_impl.cpp
+++ b/userspace/falco/grpc_server_impl.cpp
@@ -15,6 +15,7 @@ limitations under the License.
 */

 #include "config_falco.h"
+#include "falco_engine_version.h"
 #include "grpc_server_impl.h"
 #include "grpc_queue.h"
 #include "logger.h"
@@ -75,6 +76,9 @@ void falco::grpc::server_impl::version(const context& ctx, const version::reques
 	auto& version = *res.mutable_version();
 	version = FALCO_VERSION;

+	res.set_engine_version(FALCO_ENGINE_VERSION);
+	res.set_engine_fields_checksum(FALCO_FIELDS_CHECKSUM); 
+
 	res.set_major(FALCO_VERSION_MAJOR);
 	res.set_minor(FALCO_VERSION_MINOR);
 	res.set_patch(FALCO_VERSION_PATCH);
--- a/userspace/falco/version.proto
+++ b/userspace/falco/version.proto
@@ -36,10 +36,14 @@ message request
 // its parts as per semver 2.0 specification (https://semver.org).
 message response
 {
+// falco version
  string version = 1;
  uint32 major = 2;
  uint32 minor = 3;
  uint32 patch = 4;
  string prerelease = 5;
  string build = 6;
-}
+// falco engine version
+  uint32 engine_version = 7;
+  string engine_fields_checksum = 8;
+}
--- a/userspace/libhawk/CMakeLists.txt
+++ b/userspace/libhawk/CMakeLists.txt
@@ -0,0 +1,37 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations under the License.
+#
+include(CheckSymbolExists)
+
+set(
+  LIBHAWK_SOURCES
+  lifecycle.cpp
+	library.cpp
+)
+
+set(
+  LIBHAWK_PUBLIC_INCLUDES
+  hawk.h
+)
+
+set(LIBHAWK_INCLUDE_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PARENT_SCOPE)
+
+add_library(libhawk STATIC ${LIBHAWK_SOURCES})
+target_link_options(libhawk PUBLIC "LINKER:--export-dynamic-symbol=plugin_registry")
+
+#todo: we want to provide a default version of the libhawk plugin functions
+# we need to manage the situation where the user only provides parts of it and not others
+install(
+  FILES ${LIBHAWK_PUBLIC_INCLUDES}
+	${PROJECT_BINARY_DIR}/userspace/libhawk/libhawk_export.h
+  DESTINATION "${FALCO_SHARE_DIR}"
+)
--- a/userspace/libhawk/README.md
+++ b/userspace/libhawk/README.md
@@ -0,0 +1,143 @@
+# Libhawk
+
+Libhawk is a plugin system that can be used to enrich Falco
+functionalities via external, user-defined libraries.
+
+## Glossary:
+
+- library: a bundle (e.g: an ELF shared library) containing one or more plugins
+- plugin: an hawk plugin. Libraries can register one or more plugins using the `HAWK_REGISTER_PLUGIN` macro
+- plugin function: a specific function inside the plugin definition of each plugin. `hawk_init`, `hawk_destroy`
+- extension: it's the user facing term to define a library that contains one or more plugin.
+
+## Plugin definitions and lifecycle
+
+Plugins are all loaded when Falco starts.
+Falco provides a default plugin for the main functionalities.
+
+### hawk_init
+On start, the `hawk_init` function of every plugin is called.
+You can use that function to create any resource you might need
+for your plugin's lifecycle.
+
+### hawk_destroy
+
+When Falco is stopped, the `hawk_destroy` function gets called.
+Implementors have the last chance to free any resources here.
+
+### hawk_watch_rules
+
+`hawk_watch_rules` implements a transactional interface for updating rules.
+
+Its signature takes four arguments, one for each state of the transaction.
+
+An implementation looks like this
+
+```C
+void hawk_watch_rules(hawk_rules_begin_cb begin_cb,
+                      hawk_rules_insert_cb insert_cb,
+                      hawk_rules_commit_cb commit_cb,
+                      hawk_rules_rollback_cb rollback_cb)
+{
+  printf("starting rules transaction\n");
+  begin_cb(); // start the rules loading transaction
+  printf("insert rules\n");
+  insert_cb(""); // todo: pass the rules as a string here, this is empty
+  insert_cb(""); // you can do this as many times you want
+  commit_cb();   // commit rules
+  printf("rules committed");
+}
+```
+As you can see, we have a `begin_cb` that is telling the Falco engine to start the transactiont o load rules.
+Then we have an `insert_cb` which takes Falco rules as a yaml string, it can be called as many times you want.
+Finally we can either commit the transaction with `commit_cb` or we can rollback it with `rollback_cb`.
+
+**Important note**: `hawk_watch_rules` gets called in a thread by Falco.
+This means that it is not blocking and executing in parallel with the rest of Falco.
+Practically, you can implement things like a for loop to update rules **live** from a database or an external resource.
+
+After you load the extension, you will need to change the `rules_provider` configuration in `falco.yaml` to the
+name you gave to the extension you are writing if you want to use the watch rules implementation you just wrote.
+
+<a name="extension-loading"></a>
+
+## Extension Loading
+
+To tell falco to load a library containing one or more plugins
+you have to add the path to the shared object into the `extensions`
+configuration in `falco.yaml`:
+
+The path can be either absolute, relative or specified into the `ldconfig` search path.
+See `/etc/ld.so.conf` for reference.
+
+examples:
+
+```
+extensions:
+	- ./mylocalextension.so
+	- myextension.so
+	- /usr/share/falco/extensions/kubernetes.so
+```
+
+TODO: when shipping Falco with this feature, we probably want to ship a ld config file to allow dynamic
+loading from `/usr/share/falco/extensions` for example.
+
+## Plugin configuration
+
+TODO
+This can be explained once this feature is developed.
+
+## Plugin example
+
+A plugin can define one or more definitions.
+
+Here's an example of plugin that is registered and defines
+`hawk_init`, `hawk_destroy` and `hawk_watch_rules`
+
+```c
+#include "hawk.h"
+#include <stdio.h>
+
+void hawk_init() { printf("hawk_example init!\n"); }
+
+void hawk_destroy() { printf("hawk example destroy\n"); }
+
+// note: this function gets called in a thread.
+// this means that it is non blocking for the rest of falco.
+// You can start your own lifecycle here to fetch rules from
+// the outside and begin/commit as many transactions you want in a loop.
+void hawk_watch_rules(hawk_rules_begin_cb begin_cb,
+                      hawk_rules_insert_cb insert_cb,
+                      hawk_rules_commit_cb commit_cb,
+                      hawk_rules_rollback_cb rollback_cb)
+{
+
+  printf("starting rules transaction\n");
+  begin_cb(); // start the rules loading transaction
+  printf("insert rules\n");
+  insert_cb(""); // todo: pass the rules as a string here, this is empty
+  insert_cb(""); // you can do this as many times you want
+  commit_cb();   // commit rules
+  printf("rules committed");
+}
+
+hawk_plugin_definition plugin_definition = {
+    .hawk_init = &hawk_init,
+    .hawk_destroy = &hawk_destroy,
+    .hawk_watch_rules = &hawk_watch_rules,
+};
+
+HAWK_REGISTER_PLUGIN(hawk_example_c, plugin_definition)
+```
+
+To compile the plugin, save it in a file `plugin.c` and then:
+
+```bash
+FALCO=/source/falco
+gcc -o libhawk.so -fPIC -shared -I$FALCO/userspace/libhawk plugin.c
+```
+
+Remember to change the `FALCO` variable to point to where you have the Falco sources.
+
+This should produce shared object called `libhawk.so`, you can now use this library to load the plugin in Falco.
+See the [Extension loading](#extension-loading) section.
--- a/userspace/libhawk/exception.h
+++ b/userspace/libhawk/exception.h
@@ -0,0 +1,44 @@
+#pragma once
+
+#include <stdexcept>
+
+#include <stdexcept>
+#include <string>
+
+namespace libhawk
+{
+class hawk_exception : public std::runtime_error
+{
+public:
+	hawk_exception(const std::string& message):
+		std::runtime_error(message) {}
+};
+
+class hawk_plugin_exception : public hawk_exception
+{
+public:
+	hawk_plugin_exception(const std::string& plugin_name, const std::string& message):
+		hawk_exception("plugin: " + plugin_name + ", error: " + message) {}
+};
+
+class hawk_library_exception : public hawk_exception
+{
+public:
+	hawk_library_exception(const std::string& message):
+		hawk_exception(message) {}
+};
+
+class hawk_library_load_exception : public hawk_library_exception
+{
+	public:
+		hawk_library_load_exception(const std::string&library_name, const std::string&message):
+			hawk_library_exception("library loading error, library: " + library_name + " error: " + message) {}
+};
+
+class hawk_library_unload_exception : public hawk_library_exception
+{
+	public:
+		hawk_library_unload_exception(const std::string&library_name, const std::string&message):
+			hawk_library_exception("library unloading error, library: " + library_name + " error: " + message) {}
+};
+} // namespace libhawk
--- a/userspace/libhawk/hawk.h
+++ b/userspace/libhawk/hawk.h
@@ -0,0 +1,43 @@
+#ifndef HAWK_H
+#define HAWK_H
+
+// TODO(fntlnz): decide what to do with versioning here
+#define HAWK_VERSION_CODE 0x000001
+#define HAWK_VERSION_BITS(x, y, z) ((x) << 16 | (y) << 8 | (z))
+#define HAWK_AT_LEAST_VERSION(x, y, z) \
+	(HAWK_VERSION_CODE >= HAWK_VERSION_BITS(x, y, z))
+
+// Rules update follows a transactional pattern
+// - begin the transaction with `hawk_rules_begin_cb`
+// - add rules as many times you want with `hawk_rules_insert_cb`
+// - commit the rules with `hawk_rules_commit_cb`
+// - if anything went wrong, you can rollback with hawk_rules_rollback_cb
+typedef void (*hawk_rules_begin_cb)();
+typedef void (*hawk_rules_insert_cb)(char* rules_content);
+typedef void (*hawk_rules_commit_cb)();
+typedef void (*hawk_rules_rollback_cb)();
+
+typedef struct
+{
+	void (*hawk_init)(void);
+	void (*hawk_destroy)(void);
+	void (*hawk_watch_rules)(hawk_rules_begin_cb, hawk_rules_insert_cb, hawk_rules_commit_cb, hawk_rules_rollback_cb);
+} hawk_plugin_definition;
+
+typedef void(register_plugin_cb)(const char*, hawk_plugin_definition);
+
+typedef struct
+{
+	register_plugin_cb* register_plugin;
+} hawk_plugin_registry;
+
+extern hawk_plugin_registry plugin_registry;
+
+#define HAWK_REGISTER_PLUGIN(name, definition)                           \
+	void name##_hawk_plugin_init(void) __attribute__((constructor)); \
+	void name##_hawk_plugin_init(void)                               \
+	{                                                                \
+		plugin_registry.register_plugin(#name, definition);      \
+	}
+
+#endif //HAWK_H
--- a/userspace/libhawk/library.cpp
+++ b/userspace/libhawk/library.cpp
@@ -0,0 +1,59 @@
+/*
+Copyright (C) 2020 The Falco Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+		http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#include "library.h"
+#include "exception.h"
+
+#include <dlfcn.h>
+
+libhawk::library::library(const std::string &filename):
+	m_library_filename(filename){};
+
+bool libhawk::library::load()
+{
+	library_handle handler = nullptr;
+	handler = dlopen(m_library_filename.c_str(), RTLD_LAZY);
+	if(!handler)
+	{
+		std::string errmsg(dlerror());
+		throw hawk_library_load_exception(m_library_filename, errmsg);
+	}
+	m_library_handle.store(handler);
+	return (handler != nullptr);
+}
+
+bool libhawk::library::unload()
+{
+	if(!m_library_handle.load())
+	{
+		return false;
+	}
+
+	library_handle handler = m_library_handle.load();
+	if(!dlclose(handler))
+	{
+		std::string errmsg(dlerror());
+		throw hawk_library_unload_exception(m_library_filename, errmsg);
+		return false;
+	}
+	m_library_handle.store(nullptr);
+	return true;
+}
+
+bool libhawk::library::is_loaded() const
+{
+	return m_library_handle && m_library_handle.load();
+}
--- a/userspace/libhawk/library.h
+++ b/userspace/libhawk/library.h
@@ -0,0 +1,38 @@
+/*
+Copyright (C) 2020 The Falco Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+		http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#pragma once
+
+#include <string>
+#include <atomic>
+
+namespace libhawk
+{
+class library
+{
+public:
+	using library_handle = void *;
+	library(const std::string &filename);
+	bool load();
+	bool unload();
+	bool is_loaded() const;
+	~library();
+
+private:
+	const std::string m_library_filename;
+	std::atomic<library_handle> m_library_handle;
+};
+}; // namespace libhawk
--- a/userspace/libhawk/lifecycle.cpp
+++ b/userspace/libhawk/lifecycle.cpp
@@ -0,0 +1,86 @@
+/*
+Copyright (C) 2020 The Falco Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#include "lifecycle.h"
+#include "exception.h"
+
+std::map<std::string, hawk_plugin_definition> *libhawk::g_plugins;
+
+void libhawk_register_plugin(const char *name, hawk_plugin_definition def)
+{
+	if(libhawk::g_plugins == nullptr)
+	{
+		libhawk::g_plugins = new std::map<std::string, hawk_plugin_definition>();
+	}
+
+	auto name_str = std::string(name);
+	auto plugin = libhawk::g_plugins->find(name_str);
+	if(plugin != libhawk::g_plugins->end())
+	{
+		throw libhawk::hawk_exception("cannot register an already registered plugin: " + name_str);
+	}
+	libhawk::g_plugins->insert(std::make_pair(name_str, def));
+};
+
+hawk_plugin_registry plugin_registry = {
+	.register_plugin = &libhawk_register_plugin,
+};
+
+void libhawk::lifecycle::start()
+{
+	if(g_plugins == nullptr)
+	{
+		throw hawk_exception("no libhawk plugins registered");
+	}
+
+	for(const auto &plugin : *g_plugins)
+	{
+		if(plugin.second.hawk_init != nullptr)
+		{
+			plugin.second.hawk_init();
+		}
+	}
+}
+
+void libhawk::lifecycle::stop()
+{
+	for(const auto &plugin : *g_plugins)
+	{
+		if(plugin.second.hawk_destroy != nullptr)
+		{
+			plugin.second.hawk_destroy();
+		}
+	}
+}
+
+void libhawk::lifecycle::watch_rules(
+	hawk_rules_begin_cb begin_cb,
+	hawk_rules_insert_cb insert_cb,
+	hawk_rules_commit_cb commit_cb,
+	hawk_rules_rollback_cb rollback_cb,
+	const std::string &plugin_name)
+{
+	auto plugin = g_plugins->find(plugin_name);
+	if(plugin == g_plugins->end())
+	{
+		throw hawk_plugin_exception(plugin_name, "cannot watch_rules on a non existing plugin");
+	}
+	if(plugin->second.hawk_watch_rules == nullptr)
+	{
+		throw hawk_plugin_exception(plugin_name, "plugin does not implement hawk_watch_rules");
+	}
+	plugin->second.hawk_watch_rules(begin_cb, insert_cb, commit_cb, rollback_cb);
+}
--- a/userspace/libhawk/lifecycle.h
+++ b/userspace/libhawk/lifecycle.h
@@ -0,0 +1,39 @@
+/*
+Copyright (C) 2020 The Falco Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#pragma once
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "hawk.h"
+
+namespace libhawk
+{
+extern std::map<std::string, hawk_plugin_definition>* g_plugins;
+
+namespace lifecycle
+{
+void start();
+void stop();
+void watch_rules(hawk_rules_begin_cb begin_cb,
+		 hawk_rules_insert_cb insert_cb,
+		 hawk_rules_commit_cb commit_cb,
+		 hawk_rules_rollback_cb rollback_cb,
+		 const std::string& plugin_name);
+} // namespace lifecycle
+} // namespace libhawk
Author	SHA1	Message	Date
Lorenzo Fontana	38dbf28057	chore: comment out again rules validation for now Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:50:47 +01:00
Lorenzo Fontana	3239c16391	update(userspace/libhawk): further explaination for rules provider Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:49:52 +01:00
Lorenzo Fontana	549a4c3041	update(userspace/libhawk): watch rules transactional pattern documentation Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:49:52 +01:00
Lorenzo Fontana	6e7256569c	update(userspace): transactional interface for engine updates Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:49:52 +01:00
Lorenzo Fontana	c1805281ac	update: rules provider configuration Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:49:52 +01:00
Lorenzo Fontana	90c890bc2a	update: extension loading mechanism Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:49:51 +01:00
Lorenzo Fontana	24e2d175f0	update: library management code Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:49:51 +01:00
Lorenzo Fontana	4ccbd9d194	update: initial library loader Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:49:51 +01:00
Lorenzo Fontana	1957bc75b7	update(userspace/engine): copy constructor for falco_engine Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:49:51 +01:00
Lorenzo Fontana	f8c10f6c27	update(userspace): atomic falco engine delete previous instance Co-Authored-By: Leonardo Grasso <me@leonardograsso.com> Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:49:51 +01:00
Lorenzo Fontana	b90164bac1	update(userspace): engine atomic and express lifecycle with a namespace Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:49:49 +01:00
Lorenzo Fontana	538e7286bc	new(userspace): libhawk lifecycle destruction management Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:49:32 +01:00
Lorenzo Fontana	344b8c002c	new(userspace): initial lifecycle implementation Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:49:32 +01:00
Lorenzo Fontana	f87e6f1871	chore: restore the classic flags for a future refactor for the new functionalities Co-Authored-By: Leonardo Di Donato <leodidonato@gmail.com> Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:49:31 +01:00
Lorenzo Fontana	cd71f62f04	update(userspace): pointer to pointer in hawk_engine rules_cb Co-Authored-By: Leonardo Di Donato <leodidonato@gmail.com> Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-21 10:48:29 +01:00
Leonardo Di Donato	458f7ccd3b	new(userspace): use conditional_variable to signal when we have a ready-to-use (with rules) falco engine Co-authored-by: Lorenzo Fontana <lo@linux.com> Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>	2021-01-21 10:47:35 +01:00
Leonardo Di Donato	305cb62162	new(userspace/falco): destroy rules watcher when needed Co-authored-by: Lorenzo Fontana <lo@linux.com> Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>	2021-01-21 10:45:59 +01:00
Leonardo Di Donato	1a5a55a002	new(userspace): make hawk_watch_rules aware of the engine Co-authored-by: Lorenzo Fontana <lo@linux.com> Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>	2021-01-21 10:45:57 +01:00
Lorenzo Fontana	387908d075	new(userspace): initial draft for libhawk Co-Authored-By: Leonardo Di Donato <leodidonato@gmail.com> Signed-off-by: Lorenzo Fontana <fontanalorenz@gmail.com>	2021-01-21 10:38:58 +01:00
Didier Durand	b76420fe47	Fix various typos in markdown files. Signed-off-by: Didier Durand <durand.didier@gmail.com>	2021-01-19 16:38:58 +01:00
Leonardo Grasso	2883df5808	docs: move governance to falcosecurity/.github See https://github.com/falcosecurity/.github/pull/25 Signed-off-by: Leonardo Grasso <me@leonardograsso.com>	2021-01-19 10:42:07 +01:00
Mark Stemm	8c4040b610	Also include all exception fields in rule_result When returning a rule_result struct, also include a set of field names used by all exceptions for this rule. This may make building exception values a bit easier. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	49b8f87db4	Make the req. engine version 8 for k8s_audit rules These define exceptions too. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	cd8234d8b3	Remove falco_tests.yaml from gitignore It was renamed from falco_tests.yaml.in in `5bafa198c6`. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	e6b0d2697f	Use the right not equals operator. Fix typo, "!" should be "!=". Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	987ececa54	Remove test case for unknown objects. The rules loader now allows objects with unknown keys. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	7f4afffe3e	Remove old unused macros/lists Remove old macros/lists that aren't being used by any current rules. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	91bfa379ce	Properly note lists in other lists as used If a list: - list: foo items: [a, b, c] Was referenced in another list: - list: bar items: [foo, d, e, f] The first list would not be marked as used, when it should. This avoids mistaken messages like "list xxx not refered to by any rule/macro/list" Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	64a231b962	Add exceptions fields/comps/values to rules files Take advantage of the changes to support exceptions and refactor rules to use them whenever feasible: - Define exceptions for every rule. In cases where no practical exception exists e.g. "K8s <obj> Created/Deleted", define an empty exception property just to avoid warnings when loading rules. - Go through all rules and convert macros-used-as-exceptions that matched against 2-3 filter fields into exceptions. In most cases, switching from equality (e.g proc.name=nginx) to in (e.g. proc.name in (nginx)) allowed for better groupings into a smaller set of exception items. - In cases where the exception had complex combinations of fields, keep the macro as is. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	7b030727a2	Bump falco engine version to 8 for exceptions. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	b2eb3ec345	Don't look for event counts with -V/validate When running falco with -V/valdiate <rules file>, you won't get any event counts. All prior tests didn't get this far as they also resulted in rules parsing errors. However, validating can now result in warnings only. This won't exit but won't print event counts either. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	b4eb5b87b6	Automated tests for exceptions Handle various positive and negative cases. Should handle every error and warning path when reading exceptions objects or rule exception fields, and various positive cases of using exceptions to prevent alerts. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	a582599778	Support exceptions properties on rules Support exceptions properties on rules as described in https://github.com/falcosecurity/falco/pull/1376. - When parsing rules, add an empty exceptions table if not specified. - If exceptions are specified, they must contain names and lists of fields, and optionally can contain lists of comps and lists of lists of values. - If comps are not specified, = is used. - If a rule has exceptions and append:true, add values to the original rule's exception values with the matching name. - It's a warning but not an error to have exception values with a name not matching any fields. After loading all rules, build the exception condition string based on any exceptions: - If an exception has a single value for the "fields" property, values are combined into a single set to build a condition string like "field cmp (val1, val2, ...)". - Otherwise, iterate through each rule's exception values, finding the matching field names (field1, field2, ...) and comp operators (cmp1, cmp2, ...), then iterating over the list of field values (val1a, val1b, ...), (val2a, val2b, ...), building up a string of the form: and not ((field1 cmp1 val1a and field2 cmp2 val1b and ...) or (field1 cmp1 val2a and field2 cmp2 val2b and ...)... )" - If a value is not already quoted and contains a space, quote it in the string. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	3fb1d207e2	Update tests expected outputs The format of error responses has changed to include a summary of errors and/or warnings. This changed many test cases that were looking for specific outputs. Update to add counts and other minor formatting changes. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	4f192e89fa	Allow unknown top level objs as warnings When parsing a rules file, if a top level object is not one of the known types rule, macro, list, required_engine_version, instead of failing parsing, add a warning instead. This adds some forwards-compatibility to rules files. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Mark Stemm	07abb89f36	Pass back warnings when loading rules Add the notion of warnings when loading rules, which are printed if verbose is true: - load_rules now returns a tuple (success, required engine version, error array, warnings array) instead of (true, required engine version) or (false, error string) - build_error/build_error_with_context now returns an array instead of string value. - warnings are combined across calls to load_rules_doc - Current warnings include: - a rule that contains an unknown filter - a macro not referred to by any rule - a list not referred to by any rule/macro/list Any errors/warnings are concatenated into the exception if success was false. Any errors/warnings will be printed if verbose is true. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-19 10:37:55 +01:00
Lorenzo Fontana	7691dba3ff	fix(userspace/falco): output needs to be initialized after fork Co-Authored-By: Leonardo Grasso <me@leonardograsso.com> Co-Authored-By: Leonardo Di Donato <leodidonato@gmail.com> Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-18 16:56:13 +01:00
Lorenzo Fontana	c736689f6f	docs(RELEASE.md): link the ecr images in releases Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-18 16:52:02 +01:00
Lorenzo Fontana	3bcd2ca70d	update(.circleci): fix tag definition for ECR image push on releases Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-18 15:45:52 +01:00
Lorenzo Fontana	2e443e7660	build(.circleci): temporarly disable static analysis Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-18 13:15:25 +01:00
Lorenzo Fontana	bec5121fa4	docs(CHANGELOG.md): release notes for 0.27.0 Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-18 13:15:25 +01:00
Lorenzo Fontana	ee0b7daba0	docs(RELEASE.md): remove url, it does not work anymore Signed-off-by: Lorenzo Fontana <lo@linux.com>	2021-01-18 13:15:25 +01:00
Leonardo Grasso	b2bbb265b4	chore(cmake): remove unnecessary whitespace patch Signed-off-by: Leonardo Grasso <me@leonardograsso.com>	2021-01-15 14:22:14 +01:00
Leo Di Donato	0d7068b048	docs(.circleci): adding Jonah to Falco CI maintainers Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>	2021-01-13 17:22:41 +01:00
James Barlow	7f33b08634	rule(Create Hidden Files or Directories): Exclude exe_running_docker_save Signed-off-by: James Barlow <james.barlow@finbourne.com>	2021-01-08 19:21:42 +01:00
James Barlow	c2a05b3e64	rule(Mkdir binary dirs): Exclude exe_running_docker_save Signed-off-by: James Barlow <james.barlow@finbourne.com>	2021-01-08 19:21:42 +01:00
Leonardo Grasso	581d67fa08	docs(proposals/20200828-structured-exception-handling): indentation Signed-off-by: Leonardo Grasso <me@leonardograsso.com>	2021-01-08 17:53:08 +01:00
Leonardo Grasso	b7bda6d892	docs(proposals/20200828-structured-exception-handling): highlight syntax Signed-off-by: Leonardo Grasso <me@leonardograsso.com>	2021-01-08 17:53:08 +01:00
Mark Stemm	5eec26976d	Add notes on single-field exceptions If an exception item has a single value for fields, all the values are combined together into a single set to build an expression field cmp (val1, val2, ...) Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-08 17:53:08 +01:00
Mark Stemm	1916314583	Use well-defined object keys Instead of oveloading the exception item name as the key of the object, just have a flat array of object with a name property. A bit more verbose, but makes it easier to understand what the schema is. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-08 17:53:08 +01:00
Mark Stemm	8831c7f3c7	Add notion of exception operators A rule exception can now have a comps property that allows fields to be matched against items using an operator of =. If not defined, equality is implied. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-08 17:53:08 +01:00
Mark Stemm	2cebe052a1	Address feedback - Clean up npm examples so they are valid. - Small punctuation changes. - Emphasize that the strings related to field values are arbitrary. - Emphasize that exceptions only use equality matching. - Emphasize that you'll need to upgrade falco to use these new features. - Capitalize Falco everywhere. - Change language related to backwards compatibility. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-08 17:53:08 +01:00
Mark Stemm	05282f3976	Proposal on better exception handling This proposes adding exceptions as a first class object to falco rules files. It adds a new key "exceptions" to rule objects that allows a rule writer to define tuples of field names that comprise an exception, and a new top level object "exception" that contains lists of tuples of field values that define exceptions to rules. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>	2021-01-08 17:53:08 +01:00
Leo Di Donato	da4a5b1456	chore(.circleci): typos Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>	2021-01-08 15:50:26 +01:00
Leo Di Donato	36e9c2ba17	chore(.circleci): switch to falcosecurity slug for AWS ECR registry Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>	2021-01-08 15:50:26 +01:00
Leonardo Di Donato	0c8b4a2127	chore(.circleci): test out container image publish for a specific Falco development version Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>	2021-01-08 15:50:26 +01:00
Leonardo Di Donato	356b3e1451	new(.circleci): publish Falco development container images (from master) to AWS ECR Public Co-authored-by: jonahjon <jonahjones094@gmail.com> Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>	2021-01-08 15:50:26 +01:00
Leonardo Di Donato	9eb60f04ff	chore: refinements Co-authored-by: jonahjon <jonahjones094@gmail.com> Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>	2021-01-08 15:50:26 +01:00
Leonardo Di Donato	ff29188cb2	ci: add job to publish container images to AWS ECR registry Co-authored-by: jonahjon <jonahjones094@gmail.com> Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>	2021-01-08 15:50:26 +01:00
Naoki Oketani	4fb7e99c68	docs: fix a broken link of README Signed-off-by: Naoki Oketani <okepy.naoki@gmail.com>	2021-01-07 14:58:14 +01:00
Spencer Krum	d03a1f4a9b	feature(grpc): Add engine version to version svc Fixes #1269 Add two new fields in the version service for falco's engine version and the checksum of all of the fields it understands. This will require rebuilding/re-releasing all the clients. Signed-off-by: Spencer Krum <nibz@spencerkrum.com>	2020-12-15 11:00:18 -05:00
Leonardo Grasso	574e7f433b	docs(README.md): correct broken links Signed-off-by: Leonardo Grasso <me@leonardograsso.com>	2020-12-15 10:58:21 -05:00
Angelo Puglisi	f6fa18e7ec	chore(cmake): mark some variables as advanced Have some cmake variables (e.g. _INCLUDE and _LIB) marked as advanced, in order to have a cleaner ccmake menu. Signed-off-by: Angelo Puglisi <angelopuglisi86@gmail.com>	2020-12-15 10:56:20 -05:00
kaizhe	6beb9838d6	rule(list user_known_change_thread_namespace_binaries): add crio and multus to the list Signed-off-by: kaizhe <derek0405@gmail.com>	2020-12-14 04:16:15 -05:00
Angelo Puglisi	9a175cb1db	chore(cmake/modules): avoid useless rebuild Because of https://gitlab.kitware.com/cmake/cmake/-/issues/16419, every time one compiles, some external projects gets updated causing rebuild. Have EP_UPDATE_DISCONNECTED option (default OFF) to be able to control that behaviour. Signed-off-by: Angelo Puglisi <angelopuglisi86@gmail.com> Co-authored-by: Leonardo Di Donato <leodidonato@gmail.com> Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>	2020-12-10 13:28:01 -05:00
Spencer Krum	32daac3e4d	fix(config): Error out when no config file supplied Fixes: #1406 Signed-off-by: Spencer Krum <nibz@spencerkrum.com>	2020-12-10 13:26:04 -05:00
				`@@ -0,0 +1 @@`
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