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When running the docker daemon with `--selinux-enabled`, access to the docker
socket is prevented by SELinux. To access the socket, the container must be
started with `--privileged`, with SELinux disabled (`--security-opt label=disable`),
or with (e.g.) `--security-opt label=type:container_runtime_t`, which gives
it access to files restricted to the runtime ( `dockerd` daemon) itself.
While having access to the docker socket grants full `root` permissions on
the host (e.g. through starting a privileged container using the socket),
it may be preferable to restrict the container to just the socket.
This patch adds a `docker_client.process` SELinux CIL policy module that
defines a container domain (process type). It inherits the base container
template and grants the permissions needed to use the docker socket.
Without this (and the daemon running with `--selinux-enabled`);
docker run -it --rm -v /var/run/docker.sock:/var/run/docker.sock docker:cli -H unix:///var/run/docker.sock version
Client:
Version: 28.4.0
API version: 1.51
Go version: go1.24.7
Git commit: d8eb465
Built: Wed Sep 3 20:56:28 2025
OS/Arch: linux/amd64
Context: default
permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.51/version": dial unix /var/run/docker.sock: connect: permission denied
With this:
semodule -i /usr/share/udica/templates/base_container.cil
semodule -i ./contrib/selinux/docker_client.cil
docker run -it --rm -v /var/run/docker.sock:/var/run/docker.sock --security-opt label=type:docker_client.process docker:cli -H unix:///var/run/docker.sock version
Client:
Version: 28.4.0
API version: 1.51
Go version: go1.24.7
Git commit: d8eb465
Built: Wed Sep 3 20:56:28 2025
OS/Arch: linux/amd64
Context: default
Server: Docker Engine - Community
Engine:
Version: 28.4.0
API version: 1.51 (minimum version 1.24)
Go version: go1.24.7
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
The contrib directory contains scripts, images, and other helpful things
which are not part of the core docker distribution. Please note that they
could be out of date, since they do not receive the same attention as the
rest of the repository.