aquasecurity / kubectl-who-can

Show who has RBAC permissions to perform actions on different resources in Kubernetes

kubectl-who-can

Shows which subjects have RBAC permissions to VERB [TYPE | TYPE/NAME | NONRESOURCEURL] in Kubernetes.

Installation

There are several ways to install kubectl-who-can. The recommended installation is via the kubectl plugin manager called krew.

krew

I assume that you've already installed krew. Then run the following command:

kubectl krew install who-can

The plugin will be available as kubectl who-can.

Manual

Download a release distribution archive for your operating system, extract it, and add the kubectl-who-can executable to your $PATH. For example, to manually install kubectl-who-can on macOS run the following command:

VERSION=`git describe --abbrev=0`

mkdir -p /tmp/who-can/$VERSION && \
curl -L https://github.com/aquasecurity/kubectl-who-can/releases/download/$VERSION/kubectl-who-can_darwin_x86_64.tar.gz \
  | tar xz -C /tmp/who-can/$VERSION && \
sudo mv -i /tmp/who-can/$VERSION/kubectl-who-can /usr/local/bin

Build from Source

This is a standard Go program. If you already know how to build and install Go code, you probably won't need these instructions.

Note that while the code is small, it has some rather big dependencies, and fetching + building these dependencies can take a few minutes.

Option 1 (if you have a Go compiler and want to tweak the code):

# Clone this repository (or your fork)
git clone https://github.com/aquasecurity/kubectl-who-can
cd kubectl-who-can
make

The kubectl-who-can binary will be in the current directory.

Option 2 (if you have a Go compiler and just want the binary):

go install github.com/aquasecurity/kubectl-who-can/cmd/kubectl-who-can@latest

The kubectl-who-can binary will be in $GOPATH/bin.

Option 3 (if you don't have a Go compiler, but have Docker installed):

docker run --rm -v /usr/local/bin:/go/bin golang:1.17 go install github.com/aquasecurity/kubectl-who-can/cmd/kubectl-who-can@latest

The kubectl-who-can binary will be in /usr/local/bin.

Usage

$ kubectl who-can VERB (TYPE | TYPE/NAME | NONRESOURCEURL) [flags]

Flags

Name	Shorthand	Default	Usage
namespace	n		If present, the namespace scope for this CLI request
all-namespaces	A	false	If true, check for users that can do the specified action in any of the available namespaces
subresource			Specify a sub-resource such as pod/log or deployment/scale

For additional details on flags and usage, run kubectl who-can --help.