Fleshed out login spec.
This commit is contained in:
Kegan Dougal
parent
7acede1e42
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@ -201,124 +201,133 @@ Clients must register with a home server in order to use Matrix. After
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registering, the client will be given an access token which must be used in ALL
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requests to that home server as a query parameter 'access_token'.
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- TODO Kegan : Make registration like login
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- TODO Kegan : Make registration like login (just omit the "user" key on the
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initial request?)
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- TODO Kegan : Allow alternative forms of login (>1 route)
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If the client has already registered, they need to be able to login to their
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account. The home server may provide many different ways of logging in, such
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as user/password auth, login via a social network (OAuth), login by confirming
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as user/password auth, login via a social network (OAuth2), login by confirming
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a token sent to their email address, etc. This specification does not define how
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home servers should authorise their users who want to login to their existing
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accounts, but instead defines the standard interface which implementations
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should follow so that ANY client can login to ANY home server.
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The login process breaks down into the following:
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1. Get login process info.
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1. Determine the requirements for logging in.
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2. Submit the login stage credentials.
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3. Get access token or be told the next stage in the login process and repeat
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3. Get credentials or be told the next stage in the login process and repeat
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step 2.
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- What are types?
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As each home server may have different ways of logging in, the client needs to know how
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they should login. All distinct login stages MUST have a corresponding ``'type'``.
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A ``'type'`` is a namespaced string which details the mechanism for logging in.
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Matrix-defined login types
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--------------------------
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- m.login.password
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- m.login.oauth2
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- m.login.email.code
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- m.login.email.url
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A client may be able to login via multiple valid login flows, and should choose a single
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flow when logging in. A flow is a series of login stages. The home server MUST respond
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with all the valid login flows when requested::
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Password-based
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--------------
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Type: "m.login.password"
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LoginSubmission::
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{
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"type": "m.login.password",
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"user": <user_id>,
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"password": <password>
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}
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Example:
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Assume you are @bob:matrix.org and you wish to login on another mobile device.
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First, you GET /login which returns::
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{
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"type": "m.login.password"
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}
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Your client knows how to handle this, so your client prompts the user to enter
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their username and password. This is then submitted::
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{
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"type": "m.login.password",
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"user": "@bob:matrix.org",
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"password": "monkey"
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}
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The server checks this, finds it is valid, and returns::
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The client can login via 3 paths: 1a and 1b, 2a and 2b, or 3. The client should
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select one of these paths.
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[
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{
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"type": "<login type1a>",
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"stages": [ "<login type 1a>", "<login type 1b>" ]
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},
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{
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"type": "<login type2a>",
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"stages": [ "<login type 2a>", "<login type 2b>" ]
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},
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{
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"type": "<login type3>"
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}
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]
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After the login is completed, the client's fully-qualified user ID and a new access
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token MUST be returned::
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{
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"user_id": "@user:matrix.org",
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"access_token": "abcdef0123456789"
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}
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The server may optionally return "user_id" to confirm or change the user's ID.
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This is particularly useful if the home server wishes to support localpart entry
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of usernames (e.g. "bob" rather than "@bob:matrix.org").
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The ``user_id`` key is particularly useful if the home server wishes to support
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localpart entry of usernames (e.g. "user" rather than "@user:matrix.org"), as the
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client may not be able to determine its ``user_id`` in this case.
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If a login has multiple requests, the home server may wish to create a session. If
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a home server responds with a 'session' key to a request, clients MUST submit it in
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subsequent requests until the login is completed::
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{
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"session": "<session id>"
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}
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This specification defines the following login types:
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- m.login.password
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- m.login.oauth2
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- m.login.email.code
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- m.login.email.url
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Password-based
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--------------
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Type:
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"m.login.password"
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Description:
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Login is supported via a username and password.
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To respond to this type, reply with::
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{
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"type": "m.login.password",
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"user": "<user_id or user localpart>",
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"password": "<password>"
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}
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The home server MUST respond with either new credentials, the next stage of the login
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process, or a standard error response.
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OAuth2-based
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------------
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Type: "m.login.oauth2"
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This is a multi-stage login.
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Type:
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"m.login.oauth2"
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Description:
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Login is supported via OAuth2 URLs. This login consists of multiple requests.
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LoginSubmission::
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To respond to this type, reply with::
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{
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"type": "m.login.oauth2",
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"user": <user_id>
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"user": "<user_id or user localpart>"
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}
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Returns::
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The server MUST respond with::
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{
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"uri": <Authorization Request uri OR service selection uri>
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"uri": <Authorization Request URI OR service selection URI>
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}
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The home server acts as a 'confidential' Client for the purposes of OAuth2.
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If the uri is a "sevice selection uri", it is a simple page which prompts the
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user to choose which service to authorize with. On selection of a service, they
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link through to Authorization Request URIs. If there is only 1 service which the
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The home server acts as a 'confidential' client for the purposes of OAuth2.
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If the uri is a ``sevice selection URI``, it MUST point to a webpage which prompts the
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user to choose which service to authorize with. On selection of a service, this
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MUST link through to an ``Authorization Request URI``. If there is only 1 service which the
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home server accepts when logging in, this indirection can be skipped and the
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"uri" key can be the Authorization Request URI.
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"uri" key can be the ``Authorization Request URI``.
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The client visits the Authorization Request URI, which then shows the OAuth2
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Allow/Deny prompt. Hitting 'Allow' returns the redirect URI with the auth code.
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Home servers can choose any path for the redirect URI. The client should visit
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the redirect URI, which will then finish the OAuth2 login process, granting the
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The client then visits the ``Authorization Request URI``, which then shows the OAuth2
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Allow/Deny prompt. Hitting 'Allow' returns the ``redirect URI`` with the auth code.
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Home servers can choose any path for the ``redirect URI``. The client should visit
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the ``redirect URI``, which will then finish the OAuth2 login process, granting the
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home server an access token for the chosen service. When the home server gets
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this access token, it knows that the cilent has authed with the 3rd party, and
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so can return a LoginResult.
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this access token, it verifies that the cilent has authorised with the 3rd party, and
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can now complete the login. The OAuth2 ``redirect URI`` (with auth code) MUST respond
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with either new credentials, the next stage of the login process, or a standard error
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response.
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The OAuth redirect URI (with auth code) MUST return a LoginResult.
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Example:
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Assume you are @bob:matrix.org and you wish to login on another mobile device.
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First, you GET /login which returns::
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{
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"type": "m.login.oauth2"
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}
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Your client knows how to handle this, so your client prompts the user to enter
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their username. This is then submitted::
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{
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"type": "m.login.oauth2",
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"user": "@bob:matrix.org"
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}
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The server only accepts auth from Google, so returns the Authorization Request
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URI for Google::
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For example, if a home server accepts OAuth2 from Google, it would return the
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Authorization Request URI for Google::
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{
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"uri": "https://accounts.google.com/o/oauth2/auth?response_type=code&
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@ -329,145 +338,142 @@ The client then visits this URI and authorizes the home server. The client then
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visits the REDIRECT_URI with the auth code= query parameter which returns::
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{
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"user_id": "@user:matrix.org",
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"access_token": "0123456789abcdef"
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}
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Email-based (code)
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------------------
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Type: "m.login.email.code"
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This is a multi-stage login.
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Type:
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"m.login.email.code"
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Description:
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Login is supported by typing in a code which is sent in an email. This login
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consists of multiple requests.
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First LoginSubmission::
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To respond to this type, reply with::
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{
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"type": "m.login.email.code",
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"user": <user_id>
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"email": <email address>
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"user": "<user_id or user localpart>",
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"email": "<email address>"
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}
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Returns::
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{
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"type": m.login.email.code
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"session": <session id>
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}
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The email contains a code which must be sent in the next LoginSubmission::
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After validating the email address, the home server MUST send an email containing
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an authentication code and return::
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{
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"type": "m.login.email.code",
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"session": <session id>,
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"code": <code in email sent>
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"session": "<session id>"
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}
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Returns::
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The second request in this login stage involves sending this authentication code::
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{
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"access_token": <access token>
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"type": "m.login.email.code",
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"session": "<session id>",
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"code": "<code in email sent>"
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}
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The home server MUST respond to this with either new credentials, the next stage of
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the login process, or a standard error response.
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Email-based (url)
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-----------------
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Type: "m.login.email.url"
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This is a multi-stage login.
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Type:
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"m.login.email.url"
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Description:
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Login is supported by clicking on a URL in an email. This login consists of
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multiple requests.
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First LoginSubmission::
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To respond to this type, reply with::
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{
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"type": "m.login.email.url",
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"user": <user_id>
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"email": <email address>
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"user": "<user_id or user localpart>",
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"email": "<email address>"
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}
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Returns::
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After validating the email address, the home server MUST send an email containing
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an authentication URL and return::
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{
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"session": <session id>
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"type": "m.login.email.url",
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"session": "<session id>"
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}
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The email contains a URL which must be clicked. After it has been clicked, the
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client should perform a request::
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{
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"type": "m.login.email.code",
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"session": <session id>
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}
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Returns::
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{
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"access_token": <access token>
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}
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Example:
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Assume you are @bob:matrix.org and you wish to login on another mobile device.
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First, you GET /login which returns::
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{
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"type": "m.login.email.url"
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}
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Your client knows how to handle this, so your client prompts the user to enter
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their email address. This is then submitted::
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client should perform another request::
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{
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"type": "m.login.email.url",
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"user": "@bob:matrix.org",
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"email": "bob@mydomain.com"
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"session": "<session id>"
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}
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The server confirms that bob@mydomain.com is linked to @bob:matrix.org, then
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sends an email to this address and returns::
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The home server MUST respond to this with either new credentials, the next stage of
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the login process, or a standard error response.
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A common client implementation will be to periodically poll until the link is clicked.
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If the link has not been visited yet, a standard error response with an errcode of
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``M_LOGIN_EMAIL_URL_NOT_YET`` should be returned.
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N-Factor Authentication
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-----------------------
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Multiple login stages can be combined to create N-factor authentication during login.
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This can be achieved by responding with the ``'next'`` login type on completion of a
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previous login stage::
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{
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"session": "ewuigf7462"
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"next": "<next login type>"
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}
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The client then starts polling the server with the following::
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If a home server implements N-factor authentication, it MUST respond with all
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``'stages'`` when initially queried for their login requirements::
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{
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"type": "m.login.email.url",
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"session": "ewuigf7462"
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"type": "<1st login type>",
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"stages": [ <1st login type>, <2nd login type>, ... , <Nth login type> ]
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}
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(Alternatively, the server could send the device a push notification when the
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email has been validated). The email arrives and it contains a URL to click on.
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The user clicks on the which completes the login process with the server. The
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next time the client polls, it returns::
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This can be represented conceptually as::
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{
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"access_token": "abcdef0123456789"
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}
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N-Factor auth
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-------------
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Multiple login stages can be combined with the "next" key in the LoginResult.
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Example:
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A server demands an email.code then password auth before logging in. First, the
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client performs a GET /login which returns::
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{
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"type": "m.login.email.code",
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"stages": ["m.login.email.code", "m.login.password"]
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}
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The client performs the email login (See "Email-based (code)"), but instead of
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returning an access_token, it returns::
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{
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"next": "m.login.password"
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}
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The client then presents a user/password screen and the login continues until
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this is complete (See "Password-based"), which then returns the "access_token".
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_______________________
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| Login Stage 1 |
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| type: "<login type1>" |
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| ___________________ |
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| |_Request_1_________| | <-- Returns "session" key which is used throughout.
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| ___________________ |
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| |_Request_2_________| | <-- Returns a "next" value of "login type2"
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|_______________________|
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_________V_____________
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| Login Stage 2 |
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| type: "<login type2>" |
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| ___________________ |
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| |_Request_1_________| |
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| ___________________ |
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| |_Request_2_________| |
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| ___________________ |
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| |_Request_3_________| | <-- Returns a "next" value of "login type3"
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|_______________________|
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_________V_____________
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| Login Stage 3 |
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| type: "<login type3>" |
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| ___________________ |
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| |_Request_1_________| | <-- Returns user credentials
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|_______________________|
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Fallback
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--------
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Clients cannot be expected to be able to know how to process every single
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login type. If a client determines it does not know how to handle a given
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login type, it should request a login fallback page::
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If the client does NOT know how to handle the given type, they should::
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GET /login/fallback
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GET matrix/client/api/v1/login/fallback
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This MUST return an HTML page which can perform the entire login process.
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