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README.md

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Kubeaudit can now be used as both a command line tool (CLI) and as a Go package!

kubeaudit ☁️ 🔒 💪

kubeaudit is a command line tool and a Go package to audit Kubernetes clusters for various different security concerns, such as:

  • run as non-root
  • use a read-only root filesystem
  • drop scary capabilities, don't add new ones
  • don't run privileged
  • and more!

tldr. kubeaudit makes sure you deploy secure containers!

Package

To use kubeaudit as a Go package, see the package docs.

The rest of this README will focus on how to use kubeaudit as a command line tool.

Command Line Interface (CLI)

Installation

Brew

brew install kubeaudit

Download a binary

Kubeaudit has official releases that are blessed and stable: Official releases

DIY build

Master may have newer features than the stable releases. If you need a newer feature not yet included in a release you can do the following to get kubeaudit:

For go 1.12 and higher:

GO111MODULE=on go get -v github.com/Shopify/kubeaudit

For older versions of go:

git clone https://github.com/Shopify/kubeaudit.git
cd kubeaudit
make
make install

Start using kubeaudit with the Quick Start or view all the supported commands.

Kubectl Plugin

Prerequisite: kubectl v1.12.0 or later

With kubectl v1.12.0 introducing easy pluggability of external functions, kubeaudit can be invoked as kubectl audit by

  • running make plugin and having $GOPATH/bin available in your path.

or

  • renaming the binary to kubectl-audit and having it available in your path.

Docker

We also release a Docker image: shopify/kubeaudit. To run kubeaudit as a job in your cluster see Running kubeaudit in a cluster.

Quick Start

kubeaudit has three modes:

  1. Manifest mode
  2. Local mode
  3. Cluster mode

Manifest Mode

If a Kubernetes manifest file is provided using the -f/--manifest flag, kubeaudit will audit the manifest file.

Example command:

kubeaudit all -f "/path/to/manifest.yml"

Example output:

$ kubeaudit all -f "internal/test/fixtures/all_resources/deployment-apps-v1.yml"

---------------- Results for ---------------

  apiVersion: apps/v1
  kind: Deployment
  metadata:
    name: deployment
    namespace: deployment-apps-v1

--------------------------------------------

-- [error] AppArmorAnnotationMissing
   Message: AppArmor annotation missing. The annotation 'container.apparmor.security.beta.kubernetes.io/container' should be added.
   Metadata:
      Container: container
      MissingAnnotation: container.apparmor.security.beta.kubernetes.io/container

-- [error] AutomountServiceAccountTokenTrueAndDefaultSA
   Message: Default service account with token mounted. automountServiceAccountToken should be set to 'false' or a non-default service account should be used.

-- [error] CapabilityNotDropped
   Message: Capability not dropped. Ideally, the capability drop list should include the single capability 'ALL' which drops all capabilities.
   Metadata:
      Container: container
      Capability: AUDIT_WRITE
...

If no errors with a given minimum severity are found, the following is returned:

All checks completed. 0 high-risk vulnerabilities found

Autofix

Manifest mode also supports autofixing all security issues using the autofix command:

kubeaudit autofix -f "/path/to/manifest.yml"

To write the fixed manifest to a new file instead of modifying the source file, use the -o/--output flag.

kubeaudit autofix -f "/path/to/manifest.yml" -o "/path/to/fixed"

To fix a manifest based on custom rules specified on a kubeaudit config file, use the -k/--kconfig flag.

kubeaudit autofix -k "/path/to/kubeaudit-config.yml" -f "/path/to/manifest.yml" -o "/path/to/fixed"

Cluster Mode

Kubeaudit can detect if it is running within a container in a cluster. If so, it will try to audit all Kubernetes resources in that cluster:

kubeaudit all

Local Mode

Kubeaudit will try to connect to a cluster using the local kubeconfig file ($HOME/.kube/config). A different kubeconfig location can be specified using the -c/--kubeconfig flag.

kubeaudit all -c "/path/to/config"

For more information on kubernetes config files, see https://kubernetes.io/docs/concepts/configuration/organize-cluster-access-kubeconfig/

Audit Results

Kubeaudit produces results with three levels of severity:

Error: A security issue or invalid kubernetes configuration Warning: A best practice recommendation Info: Informational, no action required. This includes results that are overridden

The minimum severity level can be set using the --minSeverity/-m flag.

By default kubeaudit will output results in a human-readable way. If the output is intended to be further processed, it can be set to output JSON using the --format json flag. To output results as logs (the previous default) use --format logrus.

If there are results of severity level error, kubeaudit will exit with exit code 2. This can be changed using the --exitcode/-e flag.

For all the ways kubeaudit can be customized, see Global Flags.

Commands

Command Description Documentation
all Runs all available auditors, or those specified using a kubeaudit config. docs
autofix Automatically fixes security issues. docs

Auditors

Auditors can also be run individually.

Command Description Documentation
apparmor Finds containers running without AppArmor. docs
asat Finds pods using an automatically mounted default service account docs
capabilities Finds containers that do not drop the recommended capabilities or add new ones. docs
hostns Finds containers that have HostPID, HostIPC or HostNetwork enabled. docs
image Finds containers which do not use the desired version of an image (via the tag) or use an image without a tag. docs
limits Finds containers which exceed the specified CPU and memory limits or do not specify any. docs
mountds Finds containers that have docker socket mounted. docs
netpols Finds namespaces that do not have a default-deny network policy. docs
nonroot Finds containers running as root. docs
privesc Finds containers that allow privilege escalation. docs
privileged Finds containers running as privileged. docs
rootfs Finds containers which do not have a read-only filesystem. docs
seccomp Finds containers running without Seccomp. docs

Global Flags

Short Long Description
--format The output format to use (one of "pretty", "logrus", "json") (default is "pretty")
-c --kubeconfig Path to local Kubernetes config file. Only used in local mode (default is $HOME/.kube/config)
-f --manifest Path to the yaml configuration to audit. Only used in manifest mode.
-n --namespace Only audit resources in the specified namespace. Not currently supported in manifest mode.
-m --minseverity Set the lowest severity level to report (one of "error", "warning", "info") (default "info")
-e --exitcode Exit code to use if there are results with severity of "error". Conventionally, 0 is used for success and all non-zero codes for an error. (default 2)

Configuration File

The kubeaudit config can be used for two things:

  1. Enabling only some auditors
  2. Specifying configuration for auditors

Any configuration that can be specified using flags for the individual auditors can be represented using the config.

The config has the following format:

enabledAuditors:
  # Auditors are enabled by default if they are not explicitly set to "false"
  apparmor: false
  asat: false
  capabilities: true
  hostns: true
  image: true
  limits: true
  mountds: true
  netpols: true
  nonroot: true
  privesc: true
  privileged: true
  rootfs: true
  seccomp: true
auditors:
  capabilities:
    # If no capabilities are specified and the 'capabilities' auditor is enabled,
    # a list of recommended capabilities to drop is used
    drop: ['AUDIT_WRITE', 'CHOWN']
  image:
    # If no image is specified and the 'image' auditor is enabled, WARN results
    # will be generated for containers which use an image without a tag
    image: 'myimage:mytag'
  limits:
    # If no limits are specified and the 'limits' auditor is enabled, WARN results
    # will be generated for containers which have no cpu or memory limits specified
    cpu: '750m'
    memory: '500m'

For more details about each auditor, including a description of the auditor-specific configuration in the config, see the Auditor Docs.

Note: The kubeaudit config is not the same as the kubeconfig file specified with the -c/--kubeconfig flag, which refers to the Kubernetes config file (see Local Mode). Also note that only the all and autofix commands support using a kubeaudit config. It will not work with other commands.

Override Errors

Security issues can be ignored for specific containers or pods by adding override labels. This means the auditor will produce info results instead of error results and the audit result name will have Allowed appended to it. The labels are documented in each auditor's documentation, but the general format for auditors that support overrides is as follows:

An override label consists of a key and a value.

The key is a combination of the override type (container or pod) and an override identifier which is unique to each auditor (see the docs for the specific auditor). The key can take one of two forms depending on the override type:

  1. Container overrides, which override the auditor for that specific container, are formatted as follows:
container.audit.kubernetes.io/[container name].[override identifier]
  1. Pod overrides, which override the auditor for all containers within the pod, are formatted as follows:
audit.kubernetes.io/pod.[override identifier]

If the value is set to a non-empty string, it will be displayed in the info result as the OverrideReason:

$ kubeaudit asat -f "auditors/asat/fixtures/service-account-token-true-allowed.yml"

---------------- Results for ---------------

  apiVersion: v1
  kind: ReplicationController
  metadata:
    name: replicationcontroller
    namespace: service-account-token-true-allowed

--------------------------------------------

-- [info] AutomountServiceAccountTokenTrueAndDefaultSAAllowed
   Message: Audit result overridden: Default service account with token mounted. automountServiceAccountToken should be set to 'false' or a non-default service account should be used.
   Metadata:
      OverrideReason: SomeReason

As per Kubernetes spec, value must be 63 characters or less and must be empty or begin and end with an alphanumeric character ([a-z0-9A-Z]) with dashes (-), underscores (_), dots (.), and alphanumerics between.

Multiple override labels (for multiple auditors) can be added to the same resource.

See the specific auditor docs for the auditor you wish to override for examples.

To learn more about labels, see https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/

Contributing

If you'd like to fix a bug, contribute a feature or just correct a typo, please feel free to do so as long as you follow our Code of Conduct.

  1. Create your own fork!
  2. Get the source: go get github.com/Shopify/kubeaudit
  3. Go to the source: cd $GOPATH/src/github.com/Shopify/kubeaudit
  4. Add your forked repo as a fork: git remote add fork https://github.com/you-are-awesome/kubeaudit
  5. Create your feature branch: git checkout -b awesome-new-feature
  6. Install Kind
  7. Run the tests to see everything is working as expected: make test (to run tests without Kind: USE_KIND=false make test)
  8. Commit your changes: git commit -am 'Adds awesome feature'
  9. Push to the branch: git push fork
  10. Sign the Contributor License Agreement
  11. Submit a PR (All PR must be labeled with 🐛 (Bug fix), (New feature), 📖 (Documentation update), or ⚠️ (Breaking changes) )
  12. ???
  13. Profit

Note that if you didn't sign the CLA before opening your PR, you can re-run the check by adding a comment to the PR that says "I've signed the CLA!"!

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kubeaudit helps you audit your Kubernetes clusters against common security controls

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