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django-simple-sso ================= The latest version of this package supports: * Django >= 1.11 ####################################### Django Simple SSO Specification (DRAFT) ####################################### *********** Terminology *********** Server ====== The server is a Django website that holds all the user information and authenticates users. Client ====== The client is a Django website that provides login via SSO using the **Server**. It does not hold any user information. Key === A unique key identifying a **Client**. This key can be made public. Secret ====== A secret key shared between the **Server** and a single **Client**. This secret should never be shared with anyone other than the **Server** and **Client** and must not be transferred unencrypted. ******** Workflow ******** #. User wants to log into a **Client** by clicking a "Login" button. The initially requested URL can be passed using the ``next`` GET parameter. #. The **Client**'s Python code does a HTTP request to the **Server** to request a authentication token, this is called the **Request Token Request**. #. The **Server** returns a **Request Token**. #. The **Client** redirects the User to a view on the **Server** using the **Request Token**, this is the **Authorization Request**. #. If the user is not logged in the the **Server**, they are prompted to log in. #. The user is redirected to the **Client** including the **Request Token** and a **Auth Token**, this is the ``Authentication Request``. #. The **Client**'s Python code does a HTTP request to the **Server** to verify the **Auth Token**, this is called the **Auth Token Verification Request**. #. If the **Auth Token** is valid, the **Server** returns a serialized Django User object. #. The **Client** logs the user in using the Django User recieved from the **Server**. ******** Requests ******** General ======= All requests have a ``signature`` and ``key`` parameter, see **Security**. Request Token Request ===================== * Client: Python * Target: **Server** * Method: GET * Extra Parameters: None * Responses: * ``200``: Everything went fine, the body of the response is a url encoded query string containing with the ``request_token`` key holding the **Request Token** as well as the ``signature``. * ``400``: Bad request (missing GET parameters) * ``403``: Forbidden (invalid signature) Authorization Request ===================== * Client: Browser (User) * Target: **Server** * Method: GET * Extra Parameters: * ``request_token`` * Responses: * ``200``: Everything okay, prompt user to log in or continue. * ``400``: Bad request (missing GET parameter). * ``403``: Forbidden (invalid **Request Token**). Authentication Request ====================== * Client: Browser (User) * Target: **Client** * Method: GET * Extra Parameters: * ``request_token``: The **Request Token** returned by the **Request Token Request**. * ``auth_token``: The **Auth Token** generated by the **Authorization Request**. * Responses: * ``200``: Everything went fine, the user is now logged in. * ``400``: Bad request (missing GET parameters). * ``403``: Forbidden (invalid **Request Token**). Auth Token Verification Request =============================== * Client: Python * Target: **Server** * Method: GET * Extra Parameters: * ``auth_token``: The **Auth Token** obtained by the **Authentication Request**. * Responses: * ``200``: Everything went fine, the body of the response is a url encoded query string containing the ``user`` key which is the JSON serialized representation of the Django user to create as well as the ``signature``. ******** Security ******** Every request is signed using HMAC-SHA256. The signature is in the ``signature`` parameter. The signature message is the urlencoded, alphabetically ordered query string. The signature key is the **Secret** of the **Client**. To verify the signature the ``key`` paramater holding the **key** of the **Client** is also sent with every request from the **Client** to the **Server**. Example ======= GET Request with the GET parameters ``key=bundle123`` and the private key ``secret key``: ``fbf6396d0fc40d563e2be3c861f7eb5a1b821b76c2ac943d40a7a63b288619a9`` *************** The User object *************** The User object returned by a successful **Auth Token Verification Request** does not contain all the information about the Django User, in particular, it does not contain the password. The user object contains must contain at least the following data: * ``username``: The unique username of this user. * ``email``: The email of this user. * ``first_name``: The first name of this user, this field is required, but may be empty. * ``last_name``: The last name of this user, this field is required, but may be empty. * ``is_staff``: Can this user access the Django admin on the **Client**? * ``is_superuser``: Does this user have superuser access to the **Client**? * ``is_active``: Is the user active? ************** Implementation ************** On the server ============= * Add ``simple_sso.sso_server`` to ``INSTALLED_APPS``. * Create an instance (potentially of a subclass) of ``simple_sso.sso_server.server.Server`` and include the return value of the ``get_urls`` method on that instance into your url patterns. On the client ============= * Create a new instance of ``simple_sso.sso_server.models.Consumer`` on the **Server**. * Add the ``SIMPLE_SSO_SECRET`` and ``SIMPLE_SSO_KEY`` settings as provided by the **Server**'s ``simple_sso.sso_server.models.Client`` model. * Add the ``SIMPLE_SSO_SERVER`` setting which is the absolute URL pointing to the root where the ``simple_sso.sso_server.urls`` where include on the **Server**. * Add the ``simple_sso.sso_client.urls`` patterns somewhere on the client.
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