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<h1 id="password-auth-provider-callbacks"><a class="header" href="#password-auth-provider-callbacks">Password auth provider callbacks</a></h1>
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<p>Password auth providers offer a way for server administrators to integrate
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their Synapse installation with an external authentication system. The callbacks can be
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registered by using the Module API's <code>register_password_auth_provider_callbacks</code> method.</p>
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<h2 id="callbacks"><a class="header" href="#callbacks">Callbacks</a></h2>
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<h3 id="auth_checkers"><a class="header" href="#auth_checkers"><code>auth_checkers</code></a></h3>
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<p><em>First introduced in Synapse v1.46.0</em></p>
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<pre><code class="language-python">auth_checkers: Dict[Tuple[str, Tuple[str, ...]], Callable]
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</code></pre>
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<p>A dict mapping from tuples of a login type identifier (such as <code>m.login.password</code>) and a
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tuple of field names (such as <code>("password", "secret_thing")</code>) to authentication checking
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callbacks, which should be of the following form:</p>
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<pre><code class="language-python">async def check_auth(
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user: str,
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login_type: str,
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login_dict: "synapse.module_api.JsonDict",
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) -> Optional[
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Tuple[
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str,
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Optional[Callable[["synapse.module_api.LoginResponse"], Awaitable[None]]]
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]
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]
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</code></pre>
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<p>The login type and field names should be provided by the user in the
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request to the <code>/login</code> API. <a href="https://matrix.org/docs/spec/client_server/latest#authentication-types">The Matrix specification</a>
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defines some types, however user defined ones are also allowed.</p>
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<p>The callback is passed the <code>user</code> field provided by the client (which might not be in
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<code>@username:server</code> form), the login type, and a dictionary of login secrets passed by
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the client.</p>
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<p>If the authentication is successful, the module must return the user's Matrix ID (e.g.
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<code>@alice:example.com</code>) and optionally a callback to be called with the response to the
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<code>/login</code> request. If the module doesn't wish to return a callback, it must return <code>None</code>
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instead.</p>
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<p>If the authentication is unsuccessful, the module must return <code>None</code>.</p>
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<p>If multiple modules register an auth checker for the same login type but with different
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fields, Synapse will refuse to start.</p>
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<p>If multiple modules register an auth checker for the same login type with the same fields,
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then the callbacks will be executed in order, until one returns a Matrix User ID (and
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optionally a callback). In that case, the return value of that callback will be accepted
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and subsequent callbacks will not be fired. If every callback returns <code>None</code>, then the
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authentication fails.</p>
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<h3 id="check_3pid_auth"><a class="header" href="#check_3pid_auth"><code>check_3pid_auth</code></a></h3>
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<p><em>First introduced in Synapse v1.46.0</em></p>
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<pre><code class="language-python">async def check_3pid_auth(
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medium: str,
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address: str,
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password: str,
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) -> Optional[
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Tuple[
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str,
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Optional[Callable[["synapse.module_api.LoginResponse"], Awaitable[None]]]
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]
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]
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</code></pre>
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<p>Called when a user attempts to register or log in with a third party identifier,
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such as email. It is passed the medium (eg. <code>email</code>), an address (eg. <code>jdoe@example.com</code>)
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and the user's password.</p>
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<p>If the authentication is successful, the module must return the user's Matrix ID (e.g.
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<code>@alice:example.com</code>) and optionally a callback to be called with the response to the <code>/login</code> request.
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If the module doesn't wish to return a callback, it must return None instead.</p>
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<p>If the authentication is unsuccessful, the module must return <code>None</code>.</p>
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<p>If multiple modules implement this callback, they will be considered in order. If a
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callback returns <code>None</code>, Synapse falls through to the next one. The value of the first
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callback that does not return <code>None</code> will be used. If this happens, Synapse will not call
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any of the subsequent implementations of this callback. If every callback returns <code>None</code>,
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the authentication is denied.</p>
|
|
<h3 id="on_logged_out"><a class="header" href="#on_logged_out"><code>on_logged_out</code></a></h3>
|
|
<p><em>First introduced in Synapse v1.46.0</em></p>
|
|
<pre><code class="language-python">async def on_logged_out(
|
|
user_id: str,
|
|
device_id: Optional[str],
|
|
access_token: str
|
|
) -> None
|
|
</code></pre>
|
|
<p>Called during a logout request for a user. It is passed the qualified user ID, the ID of the
|
|
deactivated device (if any: access tokens are occasionally created without an associated
|
|
device ID), and the (now deactivated) access token.</p>
|
|
<p>Deleting the related pushers is done after calling <code>on_logged_out</code>, so you can rely on them
|
|
to still be present.</p>
|
|
<p>If multiple modules implement this callback, Synapse runs them all in order.</p>
|
|
<h3 id="get_username_for_registration"><a class="header" href="#get_username_for_registration"><code>get_username_for_registration</code></a></h3>
|
|
<p><em>First introduced in Synapse v1.52.0</em></p>
|
|
<pre><code class="language-python">async def get_username_for_registration(
|
|
uia_results: Dict[str, Any],
|
|
params: Dict[str, Any],
|
|
) -> Optional[str]
|
|
</code></pre>
|
|
<p>Called when registering a new user. The module can return a username to set for the user
|
|
being registered by returning it as a string, or <code>None</code> if it doesn't wish to force a
|
|
username for this user. If a username is returned, it will be used as the local part of a
|
|
user's full Matrix ID (e.g. it's <code>alice</code> in <code>@alice:example.com</code>).</p>
|
|
<p>This callback is called once <a href="https://spec.matrix.org/latest/client-server-api/#user-interactive-authentication-api">User-Interactive Authentication</a>
|
|
has been completed by the user. It is not called when registering a user via SSO. It is
|
|
passed two dictionaries, which include the information that the user has provided during
|
|
the registration process.</p>
|
|
<p>The first dictionary contains the results of the <a href="https://spec.matrix.org/latest/client-server-api/#user-interactive-authentication-api">User-Interactive Authentication</a>
|
|
flow followed by the user. Its keys are the identifiers of every step involved in the flow,
|
|
associated with either a boolean value indicating whether the step was correctly completed,
|
|
or additional information (e.g. email address, phone number...). A list of most existing
|
|
identifiers can be found in the <a href="https://spec.matrix.org/v1.1/client-server-api/#authentication-types">Matrix specification</a>.
|
|
Here's an example featuring all currently supported keys:</p>
|
|
<pre><code class="language-python">{
|
|
"m.login.dummy": True, # Dummy authentication
|
|
"m.login.terms": True, # User has accepted the terms of service for the homeserver
|
|
"m.login.recaptcha": True, # User has completed the recaptcha challenge
|
|
"m.login.email.identity": { # User has provided and verified an email address
|
|
"medium": "email",
|
|
"address": "alice@example.com",
|
|
"validated_at": 1642701357084,
|
|
},
|
|
"m.login.msisdn": { # User has provided and verified a phone number
|
|
"medium": "msisdn",
|
|
"address": "33123456789",
|
|
"validated_at": 1642701357084,
|
|
},
|
|
"m.login.registration_token": "sometoken", # User has registered through a registration token
|
|
}
|
|
</code></pre>
|
|
<p>The second dictionary contains the parameters provided by the user's client in the request
|
|
to <code>/_matrix/client/v3/register</code>. See the <a href="https://spec.matrix.org/latest/client-server-api/#post_matrixclientv3register">Matrix specification</a>
|
|
for a complete list of these parameters.</p>
|
|
<p>If the module cannot, or does not wish to, generate a username for this user, it must
|
|
return <code>None</code>.</p>
|
|
<p>If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns <code>None</code>, Synapse falls through to the next one. The value of the first
|
|
callback that does not return <code>None</code> will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback. If every callback returns <code>None</code>,
|
|
the username provided by the user is used, if any (otherwise one is automatically
|
|
generated).</p>
|
|
<h3 id="get_displayname_for_registration"><a class="header" href="#get_displayname_for_registration"><code>get_displayname_for_registration</code></a></h3>
|
|
<p><em>First introduced in Synapse v1.54.0</em></p>
|
|
<pre><code class="language-python">async def get_displayname_for_registration(
|
|
uia_results: Dict[str, Any],
|
|
params: Dict[str, Any],
|
|
) -> Optional[str]
|
|
</code></pre>
|
|
<p>Called when registering a new user. The module can return a display name to set for the
|
|
user being registered by returning it as a string, or <code>None</code> if it doesn't wish to force a
|
|
display name for this user.</p>
|
|
<p>This callback is called once <a href="https://spec.matrix.org/latest/client-server-api/#user-interactive-authentication-api">User-Interactive Authentication</a>
|
|
has been completed by the user. It is not called when registering a user via SSO. It is
|
|
passed two dictionaries, which include the information that the user has provided during
|
|
the registration process. These dictionaries are identical to the ones passed to
|
|
<a href="#get_username_for_registration"><code>get_username_for_registration</code></a>, so refer to the
|
|
documentation of this callback for more information about them.</p>
|
|
<p>If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns <code>None</code>, Synapse falls through to the next one. The value of the first
|
|
callback that does not return <code>None</code> will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback. If every callback returns <code>None</code>,
|
|
the username will be used (e.g. <code>alice</code> if the user being registered is <code>@alice:example.com</code>).</p>
|
|
<h2 id="is_3pid_allowed"><a class="header" href="#is_3pid_allowed"><code>is_3pid_allowed</code></a></h2>
|
|
<p><em>First introduced in Synapse v1.53.0</em></p>
|
|
<pre><code class="language-python">async def is_3pid_allowed(self, medium: str, address: str, registration: bool) -> bool
|
|
</code></pre>
|
|
<p>Called when attempting to bind a third-party identifier (i.e. an email address or a phone
|
|
number). The module is given the medium of the third-party identifier (which is <code>email</code> if
|
|
the identifier is an email address, or <code>msisdn</code> if the identifier is a phone number) and
|
|
its address, as well as a boolean indicating whether the attempt to bind is happening as
|
|
part of registering a new user. The module must return a boolean indicating whether the
|
|
identifier can be allowed to be bound to an account on the local homeserver.</p>
|
|
<p>If multiple modules implement this callback, they will be considered in order. If a
|
|
callback returns <code>True</code>, Synapse falls through to the next one. The value of the first
|
|
callback that does not return <code>True</code> will be used. If this happens, Synapse will not call
|
|
any of the subsequent implementations of this callback.</p>
|
|
<h2 id="example"><a class="header" href="#example">Example</a></h2>
|
|
<p>The example module below implements authentication checkers for two different login types: </p>
|
|
<ul>
|
|
<li><code>my.login.type</code>
|
|
<ul>
|
|
<li>Expects a <code>my_field</code> field to be sent to <code>/login</code></li>
|
|
<li>Is checked by the method: <code>self.check_my_login</code></li>
|
|
</ul>
|
|
</li>
|
|
<li><code>m.login.password</code> (defined in <a href="https://matrix.org/docs/spec/client_server/latest#password-based">the spec</a>)
|
|
<ul>
|
|
<li>Expects a <code>password</code> field to be sent to <code>/login</code></li>
|
|
<li>Is checked by the method: <code>self.check_pass</code></li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
<pre><code class="language-python">from typing import Awaitable, Callable, Optional, Tuple
|
|
|
|
import synapse
|
|
from synapse import module_api
|
|
|
|
|
|
class MyAuthProvider:
|
|
def __init__(self, config: dict, api: module_api):
|
|
|
|
self.api = api
|
|
|
|
self.credentials = {
|
|
"bob": "building",
|
|
"@scoop:matrix.org": "digging",
|
|
}
|
|
|
|
api.register_password_auth_provider_callbacks(
|
|
auth_checkers={
|
|
("my.login_type", ("my_field",)): self.check_my_login,
|
|
("m.login.password", ("password",)): self.check_pass,
|
|
},
|
|
)
|
|
|
|
async def check_my_login(
|
|
self,
|
|
username: str,
|
|
login_type: str,
|
|
login_dict: "synapse.module_api.JsonDict",
|
|
) -> Optional[
|
|
Tuple[
|
|
str,
|
|
Optional[Callable[["synapse.module_api.LoginResponse"], Awaitable[None]]],
|
|
]
|
|
]:
|
|
if login_type != "my.login_type":
|
|
return None
|
|
|
|
if self.credentials.get(username) == login_dict.get("my_field"):
|
|
return (self.api.get_qualified_user_id(username), None)
|
|
|
|
async def check_pass(
|
|
self,
|
|
username: str,
|
|
login_type: str,
|
|
login_dict: "synapse.module_api.JsonDict",
|
|
) -> Optional[
|
|
Tuple[
|
|
str,
|
|
Optional[Callable[["synapse.module_api.LoginResponse"], Awaitable[None]]],
|
|
]
|
|
]:
|
|
if login_type != "m.login.password":
|
|
return None
|
|
|
|
if self.credentials.get(username) == login_dict.get("password"):
|
|
return (self.api.get_qualified_user_id(username), None)
|
|
</code></pre>
|
|
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|
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