Authentication guide - Mattermost (self-hosted) === *Note: The Mattermost setup portion of this document is just a quick guide. See the [official documentation](https://docs.mattermost.com/developer/oauth-2-0-applications.html) for more details.* This guide uses the generic OAuth2 module for compatibility with Mattermost version 5.0 and above. 1. Sign-in with an administrator account to your Mattermost instance 2. Make sure **OAuth 2.0 Service Provider** is enabled in the Main Menu (menu button next to your username in the top left corner) --> System Console --> Custom Integrations menu, which you can find at `https://your.mattermost.domain/admin_console/integrations/custom` ![mattermost-enable-oauth2](../../images/auth/mattermost-enable-oauth2.png) 3. Navigate to the OAuth integration settings through Main Menu --> Integrations --> OAuth 2.0 Applications, at `https://your.mattermost.domain/yourteam/integrations/oauth2-apps` 4. Click on the **Add OAuth 2.0 Application** button to add a new OAuth application ![mattermost-oauth-app-add](../../images/auth/mattermost-oauth-app-add.png) 5. Fill out the form and click **Save** ![mattermost-oauth-app-form](../../images/auth/mattermost-oauth-app-form.png) *Note: The callback URL is \/auth/oauth2/callback* 6. After saving the application, you'll receive the Client ID and Client Secret ![mattermost-oauth-app-done](../../images/auth/mattermost-oauth-app-done.png) 7. Add the Client ID and Client Secret to your config.json file or pass them as environment variables * config.json: ````javascript { "production": { "oauth2": { "baseURL": "https://your.mattermost.domain", "userProfileURL": "https://your.mattermost.domain/api/v4/users/me", "userProfileUsernameAttr": "id", "userProfileDisplayNameAttr": "username", "userProfileEmailAttr": "email", "tokenURL": "https://your.mattermost.domain/oauth/access_token", "authorizationURL": "https://your.mattermost.domain/oauth/authorize", "clientID": "ii4p1u3jz7dXXXXXXXXXXXXXXX", "clientSecret": "mqzzx6fydbXXXXXXXXXXXXXXXX" } } } ```` * environment variables: ```` CMD_OAUTH2_BASEURL=https://your.mattermost.domain CMD_OAUTH2_USER_PROFILE_URL=https://your.mattermost.domain/api/v4/users/me CMD_OAUTH2_USER_PROFILE_USERNAME_ATTR=id CMD_OAUTH2_USER_PROFILE_DISPLAY_NAME_ATTR=username CMD_OAUTH2_USER_PROFILE_EMAIL_ATTR=email CMD_OAUTH2_TOKEN_URL=https://your.mattermost.domain/oauth/access_token CMD_OAUTH2_AUTHORIZATION_URL=https://your.mattermost.domain/oauth/authorize CMD_OAUTH2_CLIENT_ID=ii4p1u3jz7dXXXXXXXXXXXXXXX CMD_OAUTH2_CLIENT_SECRET=mqzzx6fydbXXXXXXXXXXXXXXXX ````