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rule update: modify rule to detect connection to K8S API Server from a container

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Signed-off-by: Hiroki Suezawa <suezawa@gmail.com>
This commit is contained in:
Hiroki Suezawa 2019-12-04 14:33:20 +09:00 committed by Lorenzo Fontana
parent e893e048a1
commit fc58ac7356
1 changed files with 6 additions and 9 deletions
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15
rules/falco_rules.yaml
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@ -2240,13 +2240,7 @@
tags: [network, container, mitre_discovery] tags: [network, container, mitre_discovery]
# In a local/user rules file, you should override this macro with the # In a local/user rules file, list the namespace or container images that are
# IP address of your k8s api server. The IP 1.2.3.4 is a placeholder
# IP that is not likely to be seen in practice.
- macro: k8s_api_server
condition: (fd.sip="1.2.3.4" and fd.sport=8080)
# In a local/user rules file, list the container images that are
# allowed to contact the K8s API Server from within a container. This # allowed to contact the K8s API Server from within a container. This
# might cover cases where the K8s infrastructure itself is running # might cover cases where the K8s infrastructure itself is running
# within a container. # within a container.
@ -2254,11 +2248,14 @@
condition: > condition: >
(container.image.repository in (gcr.io/google_containers/hyperkube-amd64, (container.image.repository in (gcr.io/google_containers/hyperkube-amd64,
gcr.io/google_containers/kube2sky, sysdig/agent, sysdig/falco, gcr.io/google_containers/kube2sky, sysdig/agent, sysdig/falco,
sysdig/sysdig)) sysdig/sysdig, falcosecurity/falco) or (k8s.ns.name = "kube-system"))
- macro: k8s_api_server
condition: (fd.sip.name="kubernetes.default.svc.cluster.local")
- rule: Contact K8S API Server From Container - rule: Contact K8S API Server From Container
desc: Detect attempts to contact the K8S API Server from a container desc: Detect attempts to contact the K8S API Server from a container
condition: outbound and k8s_api_server and container and not k8s_containers condition: evt.type=connect and evt.dir=< and (fd.typechar=4 or fd.typechar=6) and container and not k8s_containers and k8s_api_server
output: Unexpected connection to K8s API Server from container (command=%proc.cmdline %container.info image=%container.image.repository:%container.image.tag connection=%fd.name) output: Unexpected connection to K8s API Server from container (command=%proc.cmdline %container.info image=%container.image.repository:%container.image.tag connection=%fd.name)
priority: NOTICE priority: NOTICE
tags: [network, k8s, container, mitre_discovery] tags: [network, k8s, container, mitre_discovery]