Adds JWT omnianuth integration

Gemfile

@@ -39,6 +39,7 @@ gem 'omniauth-shibboleth', '~> 1.2.0'
 gem 'omniauth-twitter', '~> 1.2.0'
 gem 'omniauth_crowd', '~> 2.2.0'
 gem 'omniauth-authentiq', '~> 0.3.1'
+gem 'omniauth-jwt', '~> 0.0.2'
 gem 'rack-oauth2', '~> 1.2.1'
 gem 'jwt', '~> 1.5.6'

Gemfile.lock

@@ -552,6 +552,9 @@ GEM
       multi_json (~> 1.3)
       omniauth (>= 1.1.1)
       omniauth-oauth2 (>= 1.3.1)
+    omniauth-jwt (0.0.2)
+      jwt
+      omniauth (~> 1.1)
     omniauth-kerberos (0.3.0)
       omniauth-multipassword
       timfel-krb5-auth (~> 0.8)
@@ -1113,6 +1116,7 @@ DEPENDENCIES
   omniauth-github (~> 1.1.1)
   omniauth-gitlab (~> 1.0.2)
   omniauth-google-oauth2 (~> 0.5.2)
+  omniauth-jwt (~> 0.0.2)
   omniauth-kerberos (~> 0.3.0)
   omniauth-oauth2-generic (~> 0.2.2)
   omniauth-saml (~> 1.10)

changelogs/unreleased/43512-add-support-for-omniauth-jwt-provider.yml

+---
+title: Adds support for OmniAuth JWT provider
+merge_request: 17774
+author:
+type: added

config/gitlab.yml.example

@@ -481,7 +481,17 @@ production: &base
       # - { name: 'twitter',
       #     app_id: 'YOUR_APP_ID',
       #     app_secret: 'YOUR_APP_SECRET' }
-      #
+      # - { name: 'jwt',
+      #     app_secret: 'YOUR_APP_SECRET',
+      #     args: {
+      #             algorithm: 'HS256',
+      #             uid_claim: 'email',
+      #             required_claims: ["name", "email"],
+      #             info_map: { name: "name", email: "email" },
+      #             auth_url: 'https://example.com/',
+      #             valid_within: nil,
+      #           }
+      #   }
       # - { name: 'saml',
       #     label: 'Our SAML Provider',
       #     groups_attribute: 'Groups',
@@ -733,6 +743,17 @@ test:
       - { name: 'twitter',
           app_id: 'YOUR_APP_ID',
           app_secret: 'YOUR_APP_SECRET' }
+      - { name: 'jwt',
+          app_secret: 'YOUR_APP_SECRET',
+          args: {
+                  algorithm: 'HS256',
+                  uid_claim: 'email',
+                  required_claims: ["name", "email"],
+                  info_map: { name: "name", email: "email" },
+                  auth_url: 'https://example.com/',
+                  valid_within: nil,
+                }
+        }
       - { name: 'auth0',
           args: {
             client_id: 'YOUR_AUTH0_CLIENT_ID',

doc/integration/jwt.md

+# Integrate your server with JWT
+
+To enable the JWT OmniAuth provider you must register your application with JWT.
+JWT will provide you with a secret key for you to use.
+
+1.  On your GitLab server, open the configuration file.
+
+    For omnibus package:
+
+    ```sh
+      sudo editor /etc/gitlab/gitlab.rb
+    ```
+
+    For installations from source:
+
+    ```sh
+      cd /home/git/gitlab
+
+      sudo -u git -H editor config/gitlab.yml
+    ```
+
+1.  See [Initial OmniAuth Configuration](omniauth.md#initial-omniauth-configuration) for initial settings.
+
+1.  Add the provider configuration:
+
+    For omnibus package:
+
+    ```ruby
+      gitlab_rails['omniauth_providers'] = [
+        { name: 'jwt',
+          app_secret: 'YOUR_APP_SECRET',
+          args: {
+                  algorithm: 'HS256',
+                  uid_claim: 'email',
+                  required_claims: ["name", "email"],
+                  info_maps: { name: "name", email: "email" },
+                  auth_url: 'https://example.com/',
+                  valid_within: nil,
+                }
+        }
+      ]
+    ```
+
+    For installation from source:
+
+    ```
+      - { name: 'jwt',
+          app_secret: 'YOUR_APP_SECRET',
+          args: {
+                  algorithm: 'HS256',
+                  uid_claim: 'email',
+                  required_claims: ["name", "email"],
+                  info_map: { name: "name", email: "email" },
+                  auth_url: 'https://example.com/',
+                  valid_within: nil,
+                }
+        }
+    ```
+
+    __For more information on each configuration option refer to the [OmniAuth JWT usage documentation](https://github.com/mbleigh/omniauth-jwt#usage).__
+
+1.  Change 'YOUR_APP_SECRET' to the client secret.
+
+1.  Save the configuration file.
+
+1.  [Reconfigure GitLab][] or [restart GitLab][] for the changes to take effect if you
+    installed GitLab via Omnibus or from source respectively.
+
+On the sign in page there should now be a JWT icon below the regular sign in form.
+Click the icon to begin the authentication process. JWT will ask the user to sign in and authorize the GitLab application.
+If everything goes well the user will be returned to GitLab and will be signed in.
+
+[reconfigure GitLab]: ../administration/restart_gitlab.md#omnibus-gitlab-reconfigure
+[restart GitLab]: ../administration/restart_gitlab.md#installations-from-source

doc/integration/omniauth.md

@@ -32,6 +32,7 @@ contains some settings that are common for all providers.
 - [Auth0](auth0.md)
 - [Authentiq](../administration/auth/authentiq.md)
 - [OAuth2Generic](oauth2_generic.md)
+- [JWT](jwt.md)
 ## Initial OmniAuth Configuration