# 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 based on the [CIS Docker Benchmark v1.5.0](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.

Release | CIS |
:---:|:---:|
1.5.0|1.5.0|
1.3.6|1.4.0|
1.3.5|1.2.0|
1.3.3|1.1.0|
1.3.0|1.13.0|

## Running Docker Bench for Security

### Run from your base host

You can simply run this script 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
```

> Note: [`jq`](https://jqlang.github.io/jq/) is an optional but recommended dependency.

### Run with Docker

#### Building Docker image

You have two options if you wish to build and run this container yourself:

1. Use Docker Build:

```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.

2. Use Docker Compose:

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

_Please note that the `docker/docker-bench-security` image is out-of-date and and a manual build is required. See [#405](https://github.com/docker/docker-bench-security/issues/405) for more information._

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.

### Using the 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-bench-security
```

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

1. 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-bench-security
```

2. The /etc/hostname file is missing on macOS, so it will need to be created first. Also, `Docker Desktop` on macOS doesn't have `/usr/lib/systemd` or the above Docker
    binaries.

```sh
sudo touch /etc/hostname

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-bench-security
```

### Note

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.

### 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
  -u USERS     optional  Comma delimited list of trusted docker user(s)
  -c CHECK     optional  Comma delimited list of specific check(s) id
  -e CHECK     optional  Comma delimited list of specific check(s) id 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).
  -p PRINT     optional  Disable the printing of remediation measures. Default: print remediation measures.
```

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

If the docker container is used then the log files will be created inside the container in location `/usr/local/bin/log/`. 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>`.

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

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

`sh docker-bench-security.sh -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 -c container_images,container_runtime` will run just the container_images and container_runtime checks

`sh docker-bench-security.sh -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.