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Document CS API V2 auth changes and new APIs.

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specification/10_client_server_api.rst
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@ -10,10 +10,262 @@ support both lightweight clients which store no state and lazy-load data from
the server as required - as well as heavyweight clients which maintain a full
local peristent copy of server state.
This describes v1 of the Client-Server API as featured in the original September
2014 launch of Matrix. Version 2 is currently in development (as of Jan-March
2015) as an incremental but backwards-incompatible refinement of Version 1 and
will be released shortly.
This mostly describes v1 of the Client-Server API as featured in the original September
2014 launch of Matrix, apart from user-interactive authentication where it is
encouraged to move to V2, therefore this is the version documented here.
Version 2 is currently in development (as of Jan-March 2015) as an incremental
but backwards-incompatible refinement of Version 1 and will be released
shortly.
Authentication
--------------
Most API endpoints require the user to identify themselves by presenting
previously obtained credentials in the form of an ``access_token`` query
parameter.
In API version 2, when credentials are missing or invalid, the HTTP call will
return with a status of 401 and the error code, ``M_MISSING_TOKEN`` or
``M_UNKNOWN_TOKEN`` respectively.
User-Interactive Authentication API
-----------------------------------
This section refers to API Version 2.
Some API endpoints such as ``login`` or ``register`` require authentication that
interacts with the user. The home server may provide many different ways of
authenticating, such as user/password auth, login via a social network (OAuth2),
login by confirming a token sent to their email address, etc. This specification
does not define how home servers should authorise their users but instead
defines the standard interface which implementations should follow so that ANY
client can login to ANY home server.
The process takes the form of one or more stages, where at each stage the client
submits a set of data for a given stage type and awaits a response from the
server, which will either be a final success or a request to perform an
additional stage. This exchange continues until the final success.
Authentication works by client and server exchanging dictionaries. This
specification covers how this is done over JSON HTTP POST.
For each endpoint, a server offers one of more 'flows' that the client can use
to authenticate itself. Each flow comprises one or more 'stages'. When all
stages are complete, authentication is complete and the API call succeeds. To
establish what flows a server supports for an endpoint, a client sends the
request with no authentication. The home server returns a response with HTTP
status 401 and a JSON object as folows::
{
"flows": [
{
"stages": [ "example.type.foo", "example.type.bar" ]
},
{
"stages": [ "example.type.foo", "example.type.baz" ]
}
],
"params": {
"example.type.baz": {
"example_key": "foobar"
}
},
"session": "xxxxxx"
}
In addition to the ``flows``, this objects alows contains some extra
information:
params
This section contains any information that the client will need to know in
order to use a given type of authentication. For each login stage type
presented, that type may be present as a key in this dictionary. For example,
the public part of an OAuth client ID could be given here.
session
This is a session identifier that the client must pass back to the home
server, if one is provided, in subsequent attempts to authenticate in the same
API call.
The client then chooses a flow and attempts to complete one of the stages. It
does this by resubmitting the same request with the the addition of an 'auth'
key in the object that it submits. This dictionary contains a ``type`` key whose
value is the name of the stage type that the client is attempting to complete.
It must also contains a ``session`` key with the value of the session key given
by the home server, if one was given. It also contains other keys dependent on
the stage type being attempted. For example, if the client is attempting to
complete login type ``example.type.foo``, it might submit something like this::
{
"a_request_parameter": "something",
"another_request_parameter": "something else",
"auth": {
"type": "example.type.foo",
"session", "xxxxxx",
"example_credential": "verypoorsharedsecret"
}
}
If the home server deems the authentication attempt to be successful but still
requires more stages to be completed, it returns HTTP status 401 along with the
same object as when no authentication was attempted, with the addition of the
``completed`` key which is an array of stage type the client has completed
successfully::
{
"completed": [ "example.type.foo" ],
"flows": [
{
"stages": [ "example.type.foo", "example.type.bar" ]
},
{
"stages": [ "example.type.foo", "example.type.baz" ]
}
],
"params": {
"example.type.baz": {
"example_key": "foobar"
}
},
"session": "xxxxxx"
}
If the home server decides the attempt was unsuccessful, it returns an error
message in the standard format::
{
"errcode": [
"M_EXAMPLE_ERROR"
],
"error": "Something was wrong"
}
If the client has completed all stages of a flow, the home server performs the
API call and returns the result as normal.
Some authentication types may be completed by means other than through the
Matrix client, for example, an email confirmation may be completed when the user
clicks on the link in the email. In this case, the client retries the request
with an auth dict containing only the session key. The response to this will be
the same as if the client were attempting to complete an auth state normally,
ie. the request will either complete or request auth, with the presence or
absence of that login stage type in the 'completed' array indicating whether
that stage is complete.
This specification defines the following login types:
- ``m.login.password``
- ``m.login.oauth2``
- ``m.login.email.identity``
- ``m.login.dummy``
Password-based
~~~~~~~~~~~~~~
:Type:
``m.login.password``
:Description:
The client submits a username and secret password, both sent in plaintext.
To respond to this type, reply with an auth dict as follows::
{
"type": "m.login.password",
"user": "<user_id or user localpart>",
"password": "<password>"
}
Google ReCaptcha
~~~~~~~~~~~~~~~~
:Type:
``m.login.recaptcha``
:Description:
The user completes a Google ReCaptcha 2.0 challenge
To respond to this type, reply with an auth dict as follows::
{
"type": "m.login.recaptcha",
"response": "<captcha response>"
}
OAuth2-based
~~~~~~~~~~~~
:Type:
``m.login.oauth2``
:Description:
Authentication is supported via OAuth2 URLs. This login consists of multiple
requests.
:Parameters:
``uri``: Authorization Request URI OR service selection URI. Both contain an
encoded ``redirect URI``.
The home server acts as a 'confidential' client for the purposes of OAuth2. If
the uri is a ``sevice selection URI``, it MUST point to a webpage which prompts
the user to choose which service to authorize with. On selection of a service,
this MUST link through to an ``Authorization Request URI``. If there is only 1
service which the home server accepts when logging in, this indirection can be
skipped and the "uri" key can be the ``Authorization Request URI``.
The client then visits the ``Authorization Request URI``, which then shows the
OAuth2 Allow/Deny prompt. Hitting 'Allow' returns the [XXX: redirects to the?]``redirect URI`` with the
auth code. Home servers can choose any path for the ``redirect URI``. Once the
OAuth flow has completed, the client retries the request with the session only,
as above.
Email-based (identity server)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:Type:
``m.login.email.identity``
:Description:
Authentication is supported by authorising an email address with an identity
server.
Prior to submitting this, the client should authenticate with an identity
server. After authenticating, the session information should be submitted to
the home server.
To respond to this type, reply with an auth dict as follows::
{
"type": "m.login.email.identity",
"threepidCreds": [
{
"sid": "<identity server session id>",
"clientSecret": "<identity server client secret>",
"idServer": "<url of identity server authed with, e.g. 'matrix.org:8090'>"
}
]
}
Dummy Auth
~~~~~~~~~~
:Type:
``m.login.dummy``
:Description:
Dummy authentication always succeeds and requires no extra parameters. Its
purpose is to allow servers to not require any form of User-Interactive
Authentication to perform a request.
To respond to this type, reply with an auth dict with just the type and session,
if provided::
{
"type": "m.login.dummy",
}
Fallback
~~~~~~~~
Clients cannot be expected to be able to know how to process every single login
type. If a client does not know how to handle a given login type, it can direct
the user to a web browser with the URL of a fallback page which will allow the
user to complete that login step out-of-band in their web browser. The URL it
should open is the Home Server base URL plus prefix, plus::
/auth/<stage type>/fallback/web?session=<session ID>
Where ``stage type`` is the type name of the stage it is attempting and
``session id`` is the ID of the session given by the home server.
This MUST return an HTML page which can perform this authentication stage. This
page must attempt to call the Javascript function ``window.onAuthDone`` when
the authentication has been completed.
Pagination
----------
@ -747,350 +999,158 @@ member's state, by making a request to
}
Registration and Login
----------------------
Clients must register with a home server in order to use Matrix. After
registering, the client will be given an access token which must be used in ALL
requests to that home server as a query parameter 'access_token'.
If the client has already registered, they need to be able to login to their
account. The home server may provide many different ways of logging in, such as
user/password auth, login via a social network (OAuth2), login by confirming a
token sent to their email address, etc. This specification does not define how
home servers should authorise their users who want to login to their existing
accounts, but instead defines the standard interface which implementations
should follow so that ANY client can login to ANY home server. Clients login
using the |login|_ API. Clients register using the |register|_ API.
Registration follows the same general procedure as login, but the path requests
are sent to and the details contained in them are different.
In both registration and login cases, the process takes the form of one or more
stages, where at each stage the client submits a set of data for a given stage
type and awaits a response from the server, which will either be a final
success or a request to perform an additional stage. This exchange continues
until the final success.
In order to determine up-front what the server's requirements are, the client
can request from the server a complete description of all of its acceptable
flows of the registration or login process. It can then inspect the list of
returned flows looking for one for which it believes it can complete all of the
required stages, and perform it. As each home server may have different ways of
logging in, the client needs to know how they should login. All distinct login
stages MUST have a corresponding ``type``. A ``type`` is a namespaced string
which details the mechanism for logging in.
A client may be able to login via multiple valid login flows, and should choose
a single flow when logging in. A flow is a series of login stages. The home
server MUST respond with all the valid login flows when requested by a simple
``GET`` request directly to the ``/login`` or ``/register`` paths::
{
"flows": [
{
"type": "<login type1a>",
"stages": [ "<login type 1a>", "<login type 1b>" ]
},
{
"type": "<login type2a>",
"stages": [ "<login type 2a>", "<login type 2b>" ]
},
{
"type": "<login type3>"
}
]
}
The client can now select which flow it wishes to use, and begin making
``POST`` requests to the ``/login`` or ``/register`` paths with JSON body
content containing the name of the stage as the ``type`` key, along with
whatever additional parameters are required for that login or registration type
(see below). After the flow is completed, the client's fully-qualified user
ID and a new access token MUST be returned::
{
"user_id": "@user:matrix.org",
"access_token": "abcdef0123456789"
}
The ``user_id`` key is particularly useful if the home server wishes to support
localpart entry of usernames (e.g. "user" rather than "@user:matrix.org"), as
the client may not be able to determine its ``user_id`` in this case.
If the flow has multiple stages to it, the home server may wish to create a
session to store context between requests. If a home server responds with a
``session`` key to a request, clients MUST submit it in subsequent requests
until the flow is completed::
{
"session": "<session id>"
}
This specification defines the following login types:
- ``m.login.password``
- ``m.login.oauth2``
- ``m.login.email.code``
- ``m.login.email.url``
- ``m.login.email.identity``
Password-based
~~~~~~~~~~~~~~
:Type:
``m.login.password``
:Description:
Login is supported via a username and password.
To respond to this type, reply with::
{
"type": "m.login.password",
"user": "<user_id or user localpart>",
"password": "<password>"
}
The home server MUST respond with either new credentials, the next stage of the
login process, or a standard error response.
Captcha-based
~~~~~~~~~~~~~
:Type:
``m.login.recaptcha``
:Description:
Login is supported by responding to a captcha (in the case of the Synapse
implementation, Google's Recaptcha library is used).
To respond to this type, reply with::
{
"type": "m.login.recaptcha",
"challenge": "<challenge token>",
"response": "<user-entered text>"
}
.. NOTE::
In Synapse, the Recaptcha parameters can be obtained in Javascript by calling:
Recaptcha.get_challenge();
Recaptcha.get_response();
The home server MUST respond with either new credentials, the next stage of the
login process, or a standard error response.
OAuth2-based
~~~~~~~~~~~~
:Type:
``m.login.oauth2``
:Description:
Login is supported via OAuth2 URLs. This login consists of multiple requests.
Registration
------------
This section refers to API Version 2. These API calls currently use the prefix
``/_matrix/client/v2_alpha``.
To respond to this type, reply with::
Registering for a user account is done using the request::
{
"type": "m.login.oauth2",
"user": "<user_id or user localpart>"
}
POST $PREFIX/register
The server MUST respond with::
This API endpoint uses the User-Interactive Authentication API.
This API endoint does not require an access token.
{
"uri": <Authorization Request URI OR service selection URI>
}
The body of the POST request is a JSON object containing:
The home server acts as a 'confidential' client for the purposes of OAuth2. If
the uri is a ``sevice selection URI``, it MUST point to a webpage which prompts
the user to choose which service to authorize with. On selection of a service,
this MUST link through to an ``Authorization Request URI``. If there is only 1
service which the home server accepts when logging in, this indirection can be
skipped and the "uri" key can be the ``Authorization Request URI``.
username
Optional. This is the local part of the desired Matrix ID. If omitted, the
Home Server must generate a Matrix ID local part.
password
Required. The desired password for the account.
The client then visits the ``Authorization Request URI``, which then shows the
OAuth2 Allow/Deny prompt. Hitting 'Allow' returns the ``redirect URI`` with the
auth code. Home servers can choose any path for the ``redirect URI``. The
client should visit the ``redirect URI``, which will then finish the OAuth2
login process, granting the home server an access token for the chosen service.
When the home server gets this access token, it verifies that the cilent has
authorised with the 3rd party, and can now complete the login. The OAuth2
``redirect URI`` (with auth code) MUST respond with either new credentials, the
next stage of the login process, or a standard error response.
For example, if a home server accepts OAuth2 from Google, it would return the
Authorization Request URI for Google::
On success, this returns a JSON object with keys:
{
"uri": "https://accounts.google.com/o/oauth2/auth?response_type=code&
client_id=CLIENT_ID&redirect_uri=REDIRECT_URI&scope=photos"
}
user_id
The fully-qualified Matrix ID that has been registered.
access_token
An access token for the new account.
home_server
The hostname of the Home Server on which the account has been registered.
The client then visits this URI and authorizes the home server. The client then
visits the REDIRECT_URI with the auth code= query parameter which returns::
This endpoint may also return the following error codes:
{
"user_id": "@user:matrix.org",
"access_token": "0123456789abcdef"
}
M_USER_IN_USE
If the Matrix ID is already in use
M_EXCLUSIVE
If the requested Matrix ID is in the exclusive namespace of an application
service.
Email-based (code)
~~~~~~~~~~~~~~~~~~
:Type:
``m.login.email.code``
:Description:
Login is supported by typing in a code which is sent in an email. This login
consists of multiple requests.
Home Servers MUST perform the relevant checks and return these codes before
performing User-Interactive Authentication, although they may also return
them after authentication is completed if, for example, the requested user ID
was registered whilst the client was performing authentication.
To respond to this type, reply with::
Login
~~~~~
This section refers to API Version 1.
{
"type": "m.login.email.code",
"user": "<user_id or user localpart>",
"email": "<email address>"
}
Obtaining an access token for an existing user account is done using the
request::
After validating the email address, the home server MUST send an email
containing an authentication code and return::
POST $PREFIX/login
{
"type": "m.login.email.code",
"session": "<session id>"
}
The body of the POST request is a JSON object containing:
The second request in this login stage involves sending this authentication
code::
username
The full qualified or local part of the Matrix ID to log in with.
password
The password for the account.
{
"type": "m.login.email.code",
"session": "<session id>",
"code": "<code in email sent>"
}
On success, this returns a JSON object with keys:
The home server MUST respond to this with either new credentials, the next
stage of the login process, or a standard error response.
user_id
The fully-qualified Matrix ID that has been registered.
access_token
An access token for the new account.
home_server
The hostname of the Home Server on which the account has been registered.
Email-based (url)
Changing Password
~~~~~~~~~~~~~~~~~
:Type:
``m.login.email.url``
:Description:
Login is supported by clicking on a URL in an email. This login consists of
multiple requests.
This section refers to API Version 2. These API calls currently use the prefix
``/_matrix/client/v2_alpha``.
To respond to this type, reply with::
Request::
{
"type": "m.login.email.url",
"user": "<user_id or user localpart>",
"email": "<email address>"
}
After validating the email address, the home server MUST send an email
containing an authentication URL and return::
POST $PREFIX/account/password
{
"type": "m.login.email.url",
"session": "<session id>"
}
This API endpoint uses the User-Interactive Authentication API. An access token
should be submitted to this endpoint if the client has an active session. The
Home Server may change the flows available depending on whether a valid access
token is provided.
The email contains a URL which must be clicked. After it has been clicked, the
client should perform another request::
The body of the POST request is a JSON object containing:
{
"type": "m.login.email.url",
"session": "<session id>"
}
new_password
The new password for the account.
The home server MUST respond to this with either new credentials, the next
stage of the login process, or a standard error response.
On success, an empty JSON object is returned.
A common client implementation will be to periodically poll until the link is
clicked. If the link has not been visited yet, a standard error response with
an errcode of ``M_LOGIN_EMAIL_URL_NOT_YET`` should be returned.
The error code M_NOT_FOUND is returned if the user authenticated with a third
party identifier but the Home Server could not find a matching account in its
database.
Adding a Third Party Identifier
===============================
This section refers to API Version 2. These API calls currently use the prefix
``/_matrix/client/v2_alpha``.
Email-based (identity server)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:Type:
``m.login.email.identity``
:Description:
Login is supported by authorising an email address with an identity server.
Request::
Prior to submitting this, the client should authenticate with an identity
server. After authenticating, the session information should be submitted to
the home server.
POST $PREFIX/account/3pid
To respond to this type, reply with::
Used to add a third party identifier to the user's account.
{
"type": "m.login.email.identity",
"threepidCreds": [
{
"sid": "<identity server session id>",
"clientSecret": "<identity server client secret>",
"idServer": "<url of identity server authed with, e.g. 'matrix.org:8090'>"
}
]
}
The body of the POST request is a JSON object containing:
threePidCreds
An object containing third party identifier credentials.
bind
Optional. A boolean indicating whether the Home Server should also bind this
third party identifier to the account's matrix ID with the Identity Server. If
supplied and true, the Home Server must bind the 3pid accordingly.
The third party identifier credentials object comprises:
N-Factor Authentication
~~~~~~~~~~~~~~~~~~~~~~~
Multiple login stages can be combined to create N-factor authentication during
login.
idServer
The colon-separated hostname and port of the Identity Server used to
authenticate the third party identifer. If the port is the default, it and the
colon should be omitted.
sid
The session ID given by the Identity Server
clientSecret
The client secret used in the session with the Identity Server.
This can be achieved by responding with the ``next`` login type on completion
of a previous login stage::
On success, the empty JSON object is returned.
{
"next": "<next login type>"
}
May also return error codes:
If a home server implements N-factor authentication, it MUST respond with all
``stages`` when initially queried for their login requirements::
M_THREEPID_AUTH_FAILED
If the credentials provided could not be verified with the ID Server.
{
"type": "<1st login type>",
"stages": [ <1st login type>, <2nd login type>, ... , <Nth login type> ]
}
Fetching Currently Associated Third Party Identifiers
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This section refers to API Version 2. These API calls currently use the prefix
``/_matrix/client/v2_alpha``.
This can be represented conceptually as::
_______________________
| Login Stage 1 |
| type: "<login type1>" |
| ___________________ |
| |_Request_1_________| | <-- Returns "session" key which is used throughout.
| ___________________ |
| |_Request_2_________| | <-- Returns a "next" value of "login type2"
|_______________________|
|
|
_________V_____________
| Login Stage 2 |
| type: "<login type2>" |
| ___________________ |
| |_Request_1_________| |
| ___________________ |
| |_Request_2_________| |
| ___________________ |
| |_Request_3_________| | <-- Returns a "next" value of "login type3"
|_______________________|
|
|
_________V_____________
| Login Stage 3 |
| type: "<login type3>" |
| ___________________ |
| |_Request_1_________| | <-- Returns user credentials
|_______________________|
Request::
Fallback
~~~~~~~~
Clients cannot be expected to be able to know how to process every single login
type. If a client determines it does not know how to handle a given login type,
it should request a login fallback page::
GET $PREFIX/account/3pid
GET matrix/client/api/v1/login/fallback
This returns a list of third party identifiers that the Home Server has
associated with the user's account. This is *not* the same as the list of third
party identifiers bound to the user's Matrix ID in Identity Servers. Identifiers
in this list may be used by the Home Server as, for example, identifiers that it
will accept to reset the user's account password.
This MUST return an HTML page which can perform the entire login process.
Returns a JSON object with the key ``threepids`` whose contents is an array of
objects with the following keys:
medium
The medium of the 3pid (eg, ``email``)
address
The textual address of the 3pid, eg. the email address
Presence
~~~~~~~~

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