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Github

Allows users to authenticate using their Github credentials

Preparation​

The following placeholders will be used:

  • authentik.company is the FQDN of the authentik install.
  • www.my.company Homepage URL for your site

Github​

  1. Create an OAuth app under Developer Settings https://github.com/settings/developers by clicking on the Register a new application

Register OAuth App

  1. Application Name: Choose a name users will recognize ie: authentik
  2. Homepage URL:: www.my.company
  3. Authorization callback URL: https://authentik.company/source/oauth/callback/github
  4. Click Register Application

Example screenshot

  1. Copy the Client ID and save it for later
  2. Click Generate a new client secret and save it for later You will not be able to see the secret again, so be sure to copy it now.

authentik​

  1. Under Directory -> Federation & Social login Click Create Github OAuth Source

  2. Name: Choose a name (For the example I use Github)

  3. Slug: github (If you choose a different slug the URLs will need to be updated to reflect the change)

  4. Consumer Key: Client ID from step 6

  5. Consumer Secret: Client Secret from step 7

Here is an example of a complete authentik Github OAuth Source

Save, and you now have Github as a source.

note

For more details on how-to have the new source display on the Login Page see here.

Checking for membership of a GitHub Organisation​

info

Requires authentik 2021.12.5.

To check if the user is member of an organisation, you can use the following policy on your flows:

# Ensure flow is only run during oauth logins via Github
if context['source'].provider_type != "github":
    return True

accepted_org = "foo"

# Get the user-source connection object from the context, and get the access token
connection = context['goauthentik.io/sources/connection']
access_token = connection.access_token

# We also access the user info authentik already retrieved, to get the correct username
github_username = context["oauth_userinfo"]

# Github does not include Organisations in the userinfo endpoint, so we have to call another URL

orgs = requests.get(
    "https://api.github.com/user/orgs",
    auth=(github_username["login"], access_token),
    headers={
        "accept": "application/vnd.github.v3+json"
    }
).json()

# `orgs` will be formatted like this
# [
#     {
#         "login": "beryjuorg",
#         [...]
#     }
# ]
user_matched = any(org['login'] == accepted_org for org in orgs)
if not user_matched:
    ak_message(f"User is not member of {accepted_org}.")
return user_matched

If a user is not member of the chosen organisation, they will see this message