This is a kubectl plugin for Kubernetes OpenID Connect (OIDC) authentication. It updates the kubeconfig file with an ID token and refresh token got from the OIDC provider.

Getting Started

You need to setup the following components:

OIDC provider
Kubernetes API server
Role for your group or user
kubectl authentication

You can install the latest release from Homebrew, Krew or GitHub Releases as follows:

# Homebrew
brew tap int128/kubelogin
brew install kubelogin

# Krew
kubectl krew install oidc-login

# GitHub Releases
curl -LO https://github.com/int128/kubelogin/releases/download/v1.10.0/kubelogin_linux_amd64.zip
unzip kubelogin_linux_amd64.zip
ln -s kubelogin kubectl-oidc_login

After initial setup or when the token has been expired, just run:

% kubelogin
Using current-context: hello.k8s.local
Open http://localhost:8000 for authorization
Got a token for subject 0123456789 (valid until 2019-04-12 11:00:49 +0900 JST)
Updated ~/.kube/config

or run as a kubectl plugin:

% kubectl oidc-login

It opens the browser and you can log in to the provider. After authentication, it gets an ID token and refresh token and writes them to the kubeconfig.

For more, see the following documents:

If you are using other platforms, please contribute documents via pull requests.

Configuration

This document is for the development version. If you are looking for a specific version, see the release tags.

Kubelogin supports the following options.

Options:
      --kubeconfig string              Path to the kubeconfig file (default "~/.kube/config")
      --context string                 The name of the kubeconfig context to use
      --user string                    The name of the kubeconfig user to use. Prior to --context
      --listen-port int                Port used by kubelogin to bind its local server (default 8000)
      --skip-open-browser              If true, it does not open the browser on authentication
      --certificate-authority string   Path to a cert file for the certificate authority
      --insecure-skip-tls-verify       If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
  -v, --v int                          If set to 1 or greater, it shows debug log

  As well as you can set the following environment variables:
      $KUBECONFIG
      $KUBELOGIN_LISTEN_PORT

It supports the following keys of auth-provider in a kubeconfig. See kubectl authentication for more.

Key	Direction	Value
`idp-issuer-url`	Read (Mandatory)	Issuer URL of the provider.
`client-id`	Read (Mandatory)	Client ID of the provider.
`client-secret`	Read (Mandatory)	Client Secret of the provider.
`idp-certificate-authority`	Read	CA certificate path of the provider.
`idp-certificate-authority-data`	Read	Base64 encoded CA certificate of the provider.
`extra-scopes`	Read	Scopes to request to the provider (comma separated).
`id-token`	Write	ID token got from the provider.
`refresh-token`	Write	Refresh token got from the provider.

Kubeconfig

You can set path to the kubeconfig file by the option or the environment variable just like kubectl. It defaults to ~/.kube/config.

# by the option
kubelogin --kubeconfig /path/to/kubeconfig

# by the environment variable
KUBECONFIG="/path/to/kubeconfig1:/path/to/kubeconfig2" kubelogin

If you set multiple files, kubelogin will find the file which has the current authentication (i.e. user and auth-provider) and write a token to it.

Extra scopes

You can set extra scopes to request to the provider by extra-scopes in the kubeconfig.

kubectl config set-credentials keycloak --auth-provider-arg extra-scopes=email

Note that kubectl does not accept multiple scopes and you need to edit the kubeconfig as like:

kubectl config set-credentials keycloak --auth-provider-arg extra-scopes=SCOPES
sed -i '' -e s/SCOPES/email,profile/ $KUBECONFIG

CA Certificates

You can set your self-signed certificates for the OIDC provider (not Kubernetes API server) by idp-certificate-authority and idp-certificate-authority-data in the kubeconfig.

kubectl config set-credentials keycloak \
  --auth-provider-arg idp-certificate-authority=$HOME/.kube/keycloak-ca.pem

If kubelogin could not parse the certificate, it shows a warning and skips it.

HTTP Proxy

You can set the following environment variables if you are behind a proxy: HTTP_PROXY, HTTPS_PROXY and NO_PROXY. See also net/http#ProxyFromEnvironment.

Contributions

This is an open source software licensed under Apache License 2.0.

Feel free to open issues and pull requests for improving code and documents.