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111 lines
5.3 KiB
Markdown
111 lines
5.3 KiB
Markdown
[](https://travis-ci.org/aquasecurity/kube-bench)
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[](https://opensource.org/licenses/Apache-2.0)
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[](https://microbadger.com/images/aquasec/kube-bench "Get your own image badge on microbadger.com")
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[](https://microbadger.com/images/aquasec/kube-bench)
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# kube-bench
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The Kubernetes Bench for Security is a Go application that checks whether Kubernetes is deployed securely by running the checks documented in the CIS Kubernetes 1.6 Benchmark v1.0.0.
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Tests are configured with YAML files, making this tool easy to update as test specifications evolve.
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## Installation
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You can either install kube-bench through a dedicated container, or compile it from source:
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1. Container installation:
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Run ```docker run --rm -v `pwd`:/host aquasec/kube-bench:latest```. This will copy the kube-bench binary and configuration to you host. You can then run ```./kube-bench <master|node>```.
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2. Install from sources:
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If Go is installed on the target machines, you can simply clone this repository and run as follows:
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```go get github.com/aquasecurity/kube-bench```
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```cp $GOROOT/bin/kube-bench .```
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```./kube-bench <master|node>```
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## Usage
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```./kube-bench [command]```
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```
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Available Commands:
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federated Run benchmark checks for a Kubernetes federated deployment.
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help Help about any command
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master Run benchmark checks for a Kubernetes master node.
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node Run benchmark checks for a Kubernetes node.
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Flags:
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-c, --check string A comma-delimited list of checks to run as specified in CIS document. Example --check="1.1.1,1.1.2"
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--config string config file (default is ./cfg/config.yaml)
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-g, --group string Run all the checks under this comma-delimited list of groups. Example --group="1.1"
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--installation string Specify how kubernetes cluster was installed. Possible values are default,hyperkube,kops,kubeadm (default "default")
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--json Prints the results as JSON
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-v, --verbose verbose output (default false)
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```
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## Configuration
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Kubernetes config and binary file locations and names can vary from installation to installation, so these are configurable in the `cfg/config.yaml` file.
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They also tend to vary according to which tool was used to install Kubernetes. You can use the `--installation` flag to pick up a different default set of file names and locations. Again these defaults are configurable through `cfg/config.yaml` (and pull requests to correct or add default file locations are especially welcome).
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## Test config YAML representation
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The tests are represented as YAML documents (installed by default into ./cfg).
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An example is as listed below:
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```
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---
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controls:
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id: 1
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text: "Master Checks"
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type: "master"
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groups:
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- id: 1.1
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text: "Kube-apiserver"
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checks:
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- id: 1.1.1
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text: "Ensure that the --allow-privileged argument is set (Scored)"
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audit: "ps -ef | grep kube-apiserver | grep -v grep"
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tests:
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bin_op: or
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test_items:
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- flag: "--allow-privileged"
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set: true
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- flag: "--some-other-flag"
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set: false
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remediation: "Edit the /etc/kubernetes/config file on the master node and set the KUBE_ALLOW_PRIV parameter to '--allow-privileged=false'"
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scored: true
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```
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Recommendations (called `checks` in this document) can run on Kubernetes Master, Node or Federated API Servers.
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Checks are organized into `groups` which share similar controls (things to check for) and are grouped together in the section of the CIS Kubernetes document.
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These groups are further organized under `controls` which can be of the type `master`, `node` or `federated apiserver` to reflect the various Kubernetes node types.
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## Tests
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Tests are the items we actually look for to determine if a check is successful or not. Checks can have multiple tests, which must all be successful for the check to pass.
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The syntax for tests:
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```
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tests:
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- flag:
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set:
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compare:
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op:
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value:
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...
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```
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Tests have various `operations` which are used to compare the output of audit commands for success.
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These operations are:
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- `eq`: tests if the flag value is equal to the compared value.
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- `noteq`: tests if the flag value is unequal to the compared value.
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- `gt`: tests if the flag value is greater than the compared value.
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- `gte`: tests if the flag value is greater than or equal to the compared value.
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- `lt`: tests if the flag value is less than the compared value.
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- `lte`: tests if the flag value is less than or equal to the compared value.
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- `has`: tests if the flag value contains the compared value.
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- `nothave`: tests if the flag value does not contain the compared value.
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# Roadmap
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The tests are up-to-date with the CIS Benchmark 1.1.0, which refers to Kubernetes 1.7. Going forward we should release updates to kube-bench to reflect new releases of the Benchmark, which in turn we can anticipate being made for each new Kubernetes release.
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