docker-bench-security/README.md

# Docker Bench for Security

![Docker Bench for Security running](img/benchmark_log.png)

The Docker Bench for Security is a script that checks for dozens of common
best-practices around deploying Docker containers in production. The tests are
all automated, and are inspired by the [CIS Docker Benchmark v1.2.0](https://www.cisecurity.org/benchmark/docker/).

We are making this available as an open-source utility so the Docker community
can have an easy way to self-assess their hosts and docker containers against
this benchmark.

## Running Docker Bench for Security

We packaged docker bench as a small container for your convenience. Note that
this container is being run with a *lot* of privilege -- sharing the host's
filesystem, pid and network namespaces, due to portions of the benchmark
applying to the running host.

The easiest way to run your hosts against the Docker Bench for Security is by
running our pre-built container:

```sh
docker run --rm --net host --pid host --userns host --cap-add audit_control \
    -e DOCKER_CONTENT_TRUST=$DOCKER_CONTENT_TRUST \
    -v /etc:/etc:ro \
    -v /usr/bin/containerd:/usr/bin/containerd:ro \
    -v /usr/bin/runc:/usr/bin/runc:ro \
    -v /usr/lib/systemd:/usr/lib/systemd:ro \
    -v /var/lib:/var/lib:ro \
    -v /var/run/docker.sock:/var/run/docker.sock:ro \
    --label docker_bench_security \
    docker/docker-bench-security
```

Don't forget to adjust the shared volumes according to your operating system.
Some examples are:

1. `Docker Desktop` on macOS doesn't have `/usr/lib/systemd` or the above Docker
    binaries.

```sh
docker run --rm --net host --pid host --userns host --cap-add audit_control \
    -e DOCKER_CONTENT_TRUST=$DOCKER_CONTENT_TRUST \
    -v /etc:/etc \
    -v /var/lib:/var/lib:ro \
    -v /var/run/docker.sock:/var/run/docker.sock:ro \
    --label docker_bench_security \
    docker/docker-bench-security
```

2. On Ubuntu the `docker.service` and `docker.secret` files are located in
   `/lib/systemd/system` folder by default.

```sh
docker run --rm --net host --pid host --userns host --cap-add audit_control \
    -e DOCKER_CONTENT_TRUST=$DOCKER_CONTENT_TRUST \
    -v /etc:/etc:ro \
    -v /lib/systemd/system:/lib/systemd/system:ro \
    -v /usr/bin/containerd:/usr/bin/containerd:ro \
    -v /usr/bin/runc:/usr/bin/runc:ro \
    -v /usr/lib/systemd:/usr/lib/systemd:ro \
    -v /var/lib:/var/lib:ro \
    -v /var/run/docker.sock:/var/run/docker.sock:ro \
    --label docker_bench_security \
    docker/docker-bench-security
```

Docker bench requires Docker 1.13.0 or later in order to run.

Note that when distributions don't contain `auditctl`, the audit tests will
check `/etc/audit/audit.rules` to see if a rule is present instead.

Distribution specific Dockerfiles that fix these issues are available in the
[distros directory](https://github.com/docker/docker-bench-security/tree/master/distros).

The [distribution specific Dockerfiles](https://github.com/docker/docker-bench-security/tree/master/distros)
may also help if the distribution you're using hasn't yet shipped Docker
version 1.13.0 or later.

### Docker Bench for Security options

```sh
  -b           optional  Do not print colors
  -h           optional  Print this help message
  -l FILE      optional  Log output in FILE, inside container if run using docker
  -c CHECK     optional  Comma delimited list of specific check(s)
  -e CHECK     optional  Comma delimited list of specific check(s) to exclude
  -i INCLUDE   optional  Comma delimited list of patterns within a container or image name to check
  -x EXCLUDE   optional  Comma delimited list of patterns within a container or image name to exclude from check
  -n LIMIT     optional  In JSON output, when reporting lists of items (containers, images, etc.), limit the number of reported items to LIMIT. Default 0 (no limit).
```

By default the Docker Bench for Security script will run all available CIS tests
and produce logs in the current directory, named `docker-bench-security.sh.log.json`
and `docker-bench-security.sh.log`.

If the docker container is used then the log files will be created inside the container. If you wish to access them from the host after the container has been run you will need to mount a volume for storing them in.

The CIS based checks are named `check_<section>_<number>`, e.g. `check_2_6`
and community contributed checks are named `check_c_<number>`.
A complete list of checks is present in [functions_lib.sh](functions_lib.sh).

`sh docker-bench-security.sh -l /tmp/docker-bench-security.sh.log -c check_2_2`
will only run check `2.2 Ensure the logging level is set to 'info'`.

`sh docker-bench-security.sh -l /tmp/docker-bench-security.sh.log -e check_2_2`
will run all available checks except `2.2 Ensure the logging level is set to 'info'`.

`sh docker-bench-security.sh -l /tmp/docker-bench-security.sh.log -e docker_enterprise_configuration`
will run all available checks except the docker_enterprise_configuration group

`sh docker-bench-security.sh -l /tmp/docker-bench-security.sh.log -e docker_enterprise_configuration,check_2_2`
will run all available checks except the docker_enterprise_configuration group
and `2.2 Ensure the logging level is set to 'info'`

`sh docker-bench-security.sh -l /tmp/docker-bench-security.sh.log -c container_images -e check_4_5`
will run just the container_images checks except
`4.5 Ensure Content trust for Docker is Enabled`

Note that when submitting checks, provide information why it is a
reasonable test to add and please include some kind of official documentation
verifying that information.

## Building Docker Bench for Security

If you wish to build and run this container yourself, you can follow the
following steps:

```sh
git clone https://github.com/docker/docker-bench-security.git
cd docker-bench-security
docker build --no-cache -t docker-bench-security .
```

followed by an appropriate `docker run` command as stated above
or use [Docker Compose](https://docs.docker.com/compose/):

```sh
git clone https://github.com/docker/docker-bench-security.git
cd docker-bench-security
docker-compose run --rm docker-bench-security
```

Also, this script can also be simply run from your base host by running:

```sh
git clone https://github.com/docker/docker-bench-security.git
cd docker-bench-security
sudo sh docker-bench-security.sh
```

This script was built to be POSIX 2004 compliant, so it should be portable
across any Unix platform.