Rakkess | Kubectl Plugin To Show An Access Matrix For K8S Server Resources

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akkess

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Review Access - kubectl plugin to show an access matrix for server resources

Intro

Have you ever wondered what access rights you have on a provided kubernetes cluster? For single resources you can use kubectl auth can-i list deployments , but maybe you are looking for a complete overview? This is what rakkess is for. It lists access rights for the current user and all server resources, similar to kubectl auth can-i --list .

It is also useful to find out who may interact with some server resource. Check out the sub-command rakkess resource below.

Demo

rakkess demo

Examples

Show access for all resources

  • … at cluster scope

rakkess

  • … in some namespace

rakkess --namespace default

  • … with verbs

rakkess --verbs get,delete,watch,patch

  • … for another user

rakkess --as other-user

  • … for another service-account

rakkess --sa kube-system:namespace-controller

  • … and combine with common kubectl parameters

KUBECONFIG=otherconfig rakkess --context other-context

Show subjects with access to a given resource1

rakkess demo

  • …globally in all namespaces (only considers ClusterRoleBindings )

rakkess resource configmaps

  • …in a given namespace (considers RoleBindings and ClusterRoleBindings )

rakkess resource configmaps -n default

  • …with shorthand notation

rakkess r cm # same as rakkess resource configmaps

  • … with custom verbs

rakkess r cm --verbs get,delete,watch,patch

Name-restricted roles

Some roles only apply to resources with a specific name. To review such configurations, provide the resource name as additional argument. For example, show access rights for the ConfigMap called ingress-controller-leader-nginx in namespace ingress-nginx (note the subtle difference for nginx-ingress-serviceaccount to the previous example):

rakkess demo

As rakkess resource needs to query Roles , ClusterRoles , and their bindings, it usually requires administrative cluster access.

Also see Usage.

Installation

There are several ways to install rakkess . The recommended installation method is via krew .

Via krew

Krew is a kubectl plugin manager. If you have not yet installed krew , get it at https://github.com/kubernetes-sigs/krew. Then installation is as simple as

kubectl krew install access-matrix

The plugin will be available as kubectl access-matrix , see doc/USAGE for further details.

Binaries

When using the binaries for installation, also have a look at doc/USAGE.

Linux

curl -LO https://github.com/corneliusweig/rakkess/releases/download/v0.4.5/rakkess-amd64-linux.tar.gz \ && tar xf rakkess-amd64-linux.tar.gz rakkess-amd64-linux \ && chmod +x rakkess-amd64-linux \ && mv -i rakkess-amd64-linux $GOPATH/bin/rakkess

OSX

curl -LO https://github.com/corneliusweig/rakkess/releases/download/v0.4.5/rakkess-amd64-darwin.tar.gz \ && tar xf rakkess-amd64-darwin.tar.gz rakkess-amd64-darwin \ && chmod +x rakkess-amd64-darwin \ && mv -i rakkess-amd64-darwin $GOPATH/bin/rakkess

Windows

https://github.com/corneliusweig/rakkess/releases/download/v0.4.5/rakkess-windows-amd64.zip

From source

Build on host

Requirements:

  • go 1.14 or newer
  • GNU make
  • git

Compiling:

export PLATFORMS=$(go env GOOS) make all # binaries will be placed in out/

Build in docker

Requirements:

  • docker

Compiling:

mkdir rakkess && chdir rakkess curl -Lo Dockerfile https://raw.githubusercontent.com/corneliusweig/rakkess/master/Dockerfile docker build . -t rakkess-builder docker run --rm -v $PWD:/go/bin/ --env PLATFORMS=$(go env GOOS) rakkess docker rmi rakkess-builder

Binaries will be placed in the current directory.

Users

What are others saying about rakkess?
“Well, that looks handy! rakkess , a kubectl plugin to show an access matrix for all available resources.”@mhausenblas
“that’s indeed pretty helpful. rakkess --as system:serviceaccount:my-ns:my-sa -n my-ns prints the access matrix of a service account in a namespace”@fakod
“THE BOMB. Love it.”@ralph_squillace
“This made my day. Well, not actually today but I definitively will use it a lot.”@Soukron

[1]: This mode was inspired by kubectl-who-can

GitHub:

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