Instead of looping over the users per group and parsing passwd for each
user, we can do the reverse lookup uid->user up front and then compare
the names directly. This has the nice side-effect of silencing warnings
about non-existent users mentioned in /etc/group, which is not relevant
for policy decisions.
Signed-off-by: Markus Rudy <mr@edgeless.systems>
containerd does not automatically add groups to the list of additional
GIDs when the groups have the same name as the user:
https://github.com/containerd/containerd/blob/f482992/pkg/oci/spec_opts.go#L852-L854
This is a bug and should be corrected, but it has been present since at
least 1.6.0 and thus affects almost all containerd deployments in
existence. Thus, we adopt the same behavior and ignore groups with the
same name as the user when calculating additional GIDs.
Signed-off-by: Markus Rudy <mr@edgeless.systems>
The additional GIDs are handled by genpolicy as a BTreeSet. This set is
then serialized to an ordered JSON array. On the containerd side, the
GIDs are added to a list in the order they are discovered in /etc/group,
and the main GID of the user is prepended to that list. This means that
we don't have any guarantees that the input GIDs will be sorted. Since
the order does not matter here, comparing the list of GIDs as sets is
close enough.
Signed-off-by: Markus Rudy <mr@edgeless.systems>
The warning used to trigger even if the passwd file was not needed. This
commit moves it down to where it actually matters.
Signed-off-by: Markus Rudy <mr@edgeless.systems>
We're switching to using a rev as it may take some time for the package
to be updated on crates.io.
Signed-off-by: Fabiano Fidêncio <fidencio@northflank.com>
The service name is specified as RFC 1035 lable name [1]. The svc_name
regex in the genpolicy settings is applied to the downward API env
variables created based on the service name. So it tries to match
RFC 1035 labels after they are transformed to downward API variable
names [2]. So the set of lower case alphanumerics and dashes is
transformed to upper case alphanumerics and underscores.
The previous regex wronly permitted use of numbers, but did allow
dot and dash, which shouldn't be allowed (dot not because they aren't
conform with RFC 1035, dash not because it is transformed to underscore).
We have to take care not to also try to use the regex in places where
we actually want to check for RFC 1035 label instead of the downward
API transformed version of it.
Further, we should consider using a format like JSON5/JSONC for the
policy settings, as these are far from trivial and would highly benefit
from proper documentation through comments.
[1]: https://kubernetes.io/docs/concepts/services-networking/service/#defining-a-service
[2]: b2dfba4151/pkg/kubelet/envvars/envvars.go (L29-L70)
Signed-off-by: Paul Meyer <katexochen0@gmail.com>
Use $(sandbox-namespace) wildcard in case none is specified in yaml. If wildcard is present, compare
input against annotation value.
Fixes regression introduced in https://github.com/microsoft/kata-containers/pull/273
where samples that use metadata.namespace env var were no longer working.
Signed-off-by: Saul Paredes <saulparedes@microsoft.com>
Validate more process fields for commands enabled using the
ExecProcessRequest "commands" and/or "regex" fields from the
settings file.
Add function to get the container from state based on container_id
matching instead of matching it against every policy container data
Signed-off-by: Dan Mihai <dmihai@microsoft.com>
Signed-off-by: Ankita Pareek <ankitapareek@microsoft.com>
Using process data inputs for allow_process() is easier to
read/understand compared with the older OCI data inputs.
Signed-off-by: Dan Mihai <dmihai@microsoft.com>
As the genpolicy from_files call makes network requests to container
registries, it has a chance to fail.
Harden us against flakes due to network by introducing a 6x retry loop
in genpolicy tests.
Signed-off-by: Cameron Baird <cameronbaird@microsoft.com>
Fix up genpolicy test inputs to include required additionalGids
Include a test for the pod_container container in security_context tests
as these containers follow slightly different paths in containerd.
Introduce a test for fsGroup/supplementalGroups fields in the security
context.
Signed-off-by: Cameron Baird <cameronbaird@microsoft.com>
With added support for parsing these fields in genpolicy, we can now
enable policy verification of AdditionalGids.
Signed-off-by: Cameron Baird <cameronbaird@microsoft.com>
Update the tempfile crate to resolve security issue
[WS-2023-0045](7247a8b6ee)
that came with the remove_dir_all dependency in prior versions
Signed-off-by: stevenhorsman <steven@uk.ibm.com>
This aligns the workdir preparation more closely with the workdir
preparation for the generate integration test. Most notably, we
clean up the temporary directory before we execute the tests in it.
This way we better isolate different runs.
Signed-off-by: Leonard Cohnen <leonard.cohnen@gmail.com>
Signed-off-by: Markus Rudy <mr@edgeless.systems>
Add a new type of integration test to genpolicy. Now we can test flag handling
and how the CLI behaves with certain yaml inputs.
The first tests cover the case when a Pod references a Kubernetes secret of
config map in another file. Those need to be explicitly added via the
--config-files flag.
In the future we can easily add test suites that cover that all yaml fields
of all resources are understood by genpolicy.
Signed-off-by: Leonard Cohnen <leonard.cohnen@gmail.com>
In preparation for adding more types of integration tests, moving the
policy enforcements test into a separate folder.
Signed-off-by: Leonard Cohnen <leonard.cohnen@gmail.com>
Signed-off-by: Markus Rudy <mr@edgeless.systems>
This allows passing config maps and secrets (as well as any other
resource kinds relevant in the future) using the -c flag.
Fixes: #10033
Co-authored-by: Leonard Cohnen <leonard.cohnen@gmail.com>
Signed-off-by: Leonard Cohnen <leonard.cohnen@gmail.com>
Signed-off-by: Aurélien Bombo <abombo@microsoft.com>
This patch:
- adds a count check on mounts
- adds various test scenarios for mounts with emptyDir volume source
Signed-off-by: Archana Choudhary <archana1@microsoft.com>
Update all crossbeam-channel for all non-agent
packages (it was done separately in #11175)
to 0.5.15 to get them on latest version and remove
the versions with a vulnerability
Signed-off-by: stevenhorsman <steven@uk.ibm.com>
Bump golang.org/x/net to 0.38.0 as dependabot
isn't doing it for these packages to remediate
CVE-2025-22872
Signed-off-by: stevenhorsman <steven@uk.ibm.com>
Nydus+guest_pull has specific behavior where it improperly handles image layers on
the host, causing the CRI to not find /etc/passwd and /etc/group files
on container images which have them. The unfortunately causes different
outcomes w.r.t. GID used which we are trying to enforce with policy.
This behavior is observed/explained in https://github.com/kata-containers/kata-containers/issues/11162
Handle this exception with a config.settings.cluster_config.guest_pull
field. When this is true, simply ignore the /etc/* files in the
container image as they will not be parsed by the CRI.
Signed-off-by: Cameron Baird <cameronbaird@microsoft.com>
Add security context testcases for genpolicy, verifying that UID and GID
configurations controlled by the kubernetes security context are
enforced.
Also, fix the other CreateContainerRequest tests' expected contents to
reflect our new genpolicy parsing/enforcement of GIDs.
Signed-off-by: Cameron Baird <cameronbaird@microsoft.com>
With fixes to align policy GID parsing with the CRI behavior, we can now
enable policy verification of GIDs.
Signed-off-by: Cameron Baird <cameronbaird@microsoft.com>
The GID used for the running process in an OCI container is a function of
1. The securityContext.runAsGroup specified in a pod yaml, 2. The UID:GID mapping in
/etc/passwd, if present in the container image layers, 3. Zero, even if
the userstr specifies a GID.
Make our policy engine align with this behavior by:
1. At the registry level, always obtain the GID from the /etc/passwd
file if present. Ignore GIDs specified in the userstr encoded in the
OCI container.
2. After an update to UID due to securityContexts, perform one final check against
the /etc/passwd file if present. The GID used for the running
process is the mapping in this file from UID->GID.
3. Override everything above with the GID of the securityContext
configuration if provided
Signed-off-by: Cameron Baird <cameronbaird@microsoft.com>
Our policy should cover these fields for securityContexts at the pod or
container level of granularity.
Signed-off-by: Cameron Baird <cameronbaird@microsoft.com>
The get_process logic in registry.rs did not account for all cases
(username:groupname), did not defer to contents of /etc/group,
/etc/passwd when it should, and was difficult to read.
Clean this implementation up, factoring the string parsing for
user/group strings into their own functions. Enable the
registry::Container class to query /etc/passwd and /etc/group, if they
exist.
Signed-off-by: Cameron Baird <cameronbaird@microsoft.com>
