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diff --git a/doc/api/oauth2.md b/doc/api/oauth2.md new file mode 100644 index 00000000000..d416a826f79 --- /dev/null +++ b/doc/api/oauth2.md @@ -0,0 +1,102 @@ +# GitLab as an OAuth2 client + +This document is about using other OAuth authentication service providers to sign into GitLab. +If you want GitLab to be an OAuth authentication service provider to sign into other services please see the [Oauth2 provider documentation](../integration/oauth_provider.md). + +OAuth2 is a protocol that enables us to authenticate a user without requiring them to give their password. + +Before using the OAuth2 you should create an application in user's account. Each application gets a unique App ID and App Secret parameters. You should not share these. + +This functionality is based on [doorkeeper gem](https://github.com/doorkeeper-gem/doorkeeper) + +## Web Application Flow + +This flow is using for authentication from third-party web sites and is probably used the most. +It basically consists of an exchange of an authorization token for an access token. For more detailed info, check out the [RFC spec here](http://tools.ietf.org/html/rfc6749#section-4.1) + +This flow consists from 3 steps. + +### 1. Registering the client + +Create an application in user's account profile. + +### 2. Requesting authorization + +To request the authorization token, you should visit the `/oauth/authorize` endpoint. You can do that by visiting manually the URL: + +``` +http://localhost:3000/oauth/authorize?client_id=APP_ID&redirect_uri=REDIRECT_URI&response_type=code +``` + +Where REDIRECT_URI is the URL in your app where users will be sent after authorization. + +### 3. Requesting the access token + +To request the access token, you should use the returned code and exchange it for an access token. To do that you can use any HTTP client. In this case, I used rest-client: + +``` +parameters = 'client_id=APP_ID&client_secret=APP_SECRET&code=RETURNED_CODE&grant_type=AUTHORIZATION_CODE&redirect_uri=REDIRECT_URI' +RestClient.post 'http://localhost:3000/oauth/token', parameters + +# The response will be +{ + "access_token": "de6780bc506a0446309bd9362820ba8aed28aa506c71eedbe1c5c4f9dd350e54", + "token_type": "bearer", + "expires_in": 7200, + "refresh_token": "8257e65c97202ed1726cf9571600918f3bffb2544b26e00a61df9897668c33a1" +} +``` + +You can now make requests to the API with the access token returned. + +### Use the access token to access the API + +The access token allows you to make requests to the API on a behalf of a user. + +``` +GET https://localhost:3000/api/v3/user?access_token=OAUTH-TOKEN +``` + +Or you can put the token to the Authorization header: + +``` +curl -H "Authorization: Bearer OAUTH-TOKEN" https://localhost:3000/api/v3/user +``` + +## Resource Owner Password Credentials + +In this flow, a token is requested in exchange for the resource owner credentials (username and password). +The credentials should only be used when there is a high degree of trust between the resource owner and the client (e.g. the +client is part of the device operating system or a highly privileged application), and when other authorization grant types are not +available (such as an authorization code). + +Even though this grant type requires direct client access to the resource owner credentials, the resource owner credentials are used +for a single request and are exchanged for an access token. This grant type can eliminate the need for the client to store the +resource owner credentials for future use, by exchanging the credentials with a long-lived access token or refresh token. +You can do POST request to `/oauth/token` with parameters: + +``` +{ + "grant_type" : "password", + "username" : "user@example.com", + "password" : "sekret" +} +``` + +Then, you'll receive the access token back in the response: + +``` +{ + "access_token": "1f0af717251950dbd4d73154fdf0a474a5c5119adad999683f5b450c460726aa", + "token_type": "bearer", + "expires_in": 7200 +} +``` + +For testing you can use the oauth2 ruby gem: + +``` +client = OAuth2::Client.new('the_client_id', 'the_client_secret', :site => "http://example.com") +access_token = client.password.get_token('user@example.com', 'sekret') +puts access_token.token +``` |