akcess

Akcess

akcess is a command-line utility that can be used to share very fine-grained access to your Kubernetes cluster with other teams.

» akcess --help
Create kubeconfig file with specified fine-grained authorization

Usage:
  akcess [flags]
  akcess [command]

Available Commands:
  allow       Allow the access to the resources
  completion  Generate the autocompletion script for the specified shell
  delete      Delete the kubernetes resources that were made specific allow command
  help        Help about any command
  list        List the number of times we ran the allow command
  version     Print the version of akcess

Flags:
  -h, --help   help for akcess

Use "akcess [command] --help" for more information about a command.

Demo

Use cases

Consider a scenario where you are running an application in your Kubernetes cluster that is failing because of a certain reason and the other (dev) team is asking for permissions to see the logs of that application.

In most of the cases, you wouldn't give the admin access to your Kubernetes cluster, instead, you can use akcess to generate kubeconfig file that would allow other teams, for example, to just access logs of that particular application (pod).

» akcess allow --verb get --resource pods,pods/log -n <namespace>

Specifying duration

If you are on Kubernetes cluster version 1.22 or greater than it, you can also specify how much time this access should be allowed for using the below command

# value of --for is in minutes and can not be less than 10
» akcess allow --verb get --resource pods,pods/log -n <namespace> --for 10

Installing akcess

akcess is not available currently using OS package managers. You will have to install it by downloading the release from GitHub.

Go to releases page and download the appropriate binary for your operating system and architecture, using either curl or wget commands. And move it to your PATH.

Linux

You can figure out the operating system details using the below command

» uname -a
Linux vivek 5.13.0-30-generic #33~20.04.1-Ubuntu SMP Mon Feb 7 14:25:10 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

• Download, respective binary (artifacts) from releases, you can specify the expected value for the version var

export VERSION=0.0.1
wget https://github.com/viveksinghggits/akcess/releases/download/v${VERSION}/akcess_${VERSION}_Linux_x86_64.tar.gz

• Extract the downloaded .tar.gz file

tar xf akcess_0.0.1_Linux_x86_64.tar.gz

• Move the binary to PATH

mv akcess /usr/local/bin

Examples

• Allow access to get pods from default namespace

» akcess allow --verb list --resource pods

• Allow access to get pods from default namespace and username test

» akcess allow --verb list --resource pods --username test

• Allow access to see logs of pod with name nginx in test namespace

# log is sub resource for pod resource
» akcess allow --verb get --resource pods,pods/log -n test --resource-name nginx

• Allow access to exec into pods of namespace database

» akcess allow  --verb get,create --resource pods,pods/exec -n database

• Allow access to see logs of pods that have label component=database set in namespace backend

# more than one labels can be comma separated
» akcess allow  --verb get --resource pods,pods/log -l component=database -n backend

• Allow access to get the services that have label component=database set in namespace backend

» akcess allow  --verb get --resource services -l component=database -n backend

You can also redirect the output of the above commands to a file, that can be set at KUBECONFIG env var.

» akcess allow --verb get --resource pods,pods/log -n test > logsconfig
» export KUBECONFIG=logsconfig

How does it work

akcess creates respective RBAC (Role, RoleBinding) and CSR resources using the resources and verbs that are specified in the akcess allow command.

Whenever we create a Kubernetes resource, we annotate it with a key allow.akcess.id and value to be a UUID. The set of resources that have been created or the number of times akcess allow has been run can be figured out by running

» akcess list
- id: ee022ab3-246f-4a6d-bd53-e04ae90cc1d9
  createdAt: 2022-03-06T12:03:42.171995731+01:00
  namespace: test
- id: 818e4e6f-4be9-41a2-9f8b-de4247626d16
  createdAt: 2022-03-06T12:12:17.884823402+01:00
  namespace: default

To delete Kubernetes resources for a specific run we can run

» akcess delete --id ee022ab3-246f-4a6d-bd53-e04ae90cc1d9