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< h1 id = "password-auth-provider-callbacks" > < a class = "header" href = "#password-auth-provider-callbacks" > Password auth provider callbacks< / a > < / h1 >
< p > Password auth providers offer a way for server administrators to integrate
their Synapse installation with an external authentication system. The callbacks can be
registered by using the Module API's < code > register_password_auth_provider_callbacks< / code > method.< / p >
< h2 id = "callbacks" > < a class = "header" href = "#callbacks" > Callbacks< / a > < / h2 >
< h3 id = "auth_checkers" > < a class = "header" href = "#auth_checkers" > < code > auth_checkers< / code > < / a > < / h3 >
< p > < em > First introduced in Synapse v1.46.0< / em > < / p >
< pre > < code class = "language-python" > auth_checkers: Dict[Tuple[str, Tuple[str, ...]], Callable]
< / code > < / pre >
< p > A dict mapping from tuples of a login type identifier (such as < code > m.login.password< / code > ) and a
tuple of field names (such as < code > (" password" , " secret_thing" )< / code > ) to authentication checking
callbacks, which should be of the following form:< / p >
< pre > < code class = "language-python" > async def check_auth(
user: str,
login_type: str,
login_dict: " synapse.module_api.JsonDict" ,
) -> Optional[
Tuple[
str,
Optional[Callable[[" synapse.module_api.LoginResponse" ], Awaitable[None]]]
]
]
< / code > < / pre >
< p > The login type and field names should be provided by the user in the
request to the < code > /login< / code > API. < a href = "https://matrix.org/docs/spec/client_server/latest#authentication-types" > The Matrix specification< / a >
defines some types, however user defined ones are also allowed.< / p >
< p > The callback is passed the < code > user< / code > field provided by the client (which might not be in
< code > @username:server< / code > form), the login type, and a dictionary of login secrets passed by
the client.< / p >
< p > If the authentication is successful, the module must return the user's Matrix ID (e.g.
< code > @alice:example.com< / code > ) and optionally a callback to be called with the response to the
< code > /login< / code > request. If the module doesn't wish to return a callback, it must return < code > None< / code >
instead.< / p >
< p > If the authentication is unsuccessful, the module must return < code > None< / code > .< / p >
< p > Note that the user is not automatically registered, the < code > register_user(..)< / code > method of
the < a href = "writing_a_module.html" > module API< / a > can be used to lazily create users.< / p >
< p > If multiple modules register an auth checker for the same login type but with different
fields, Synapse will refuse to start.< / p >
< p > If multiple modules register an auth checker for the same login type with the same fields,
then the callbacks will be executed in order, until one returns a Matrix User ID (and
optionally a callback). In that case, the return value of that callback will be accepted
and subsequent callbacks will not be fired. If every callback returns < code > None< / code > , then the
authentication fails.< / p >
< h3 id = "check_3pid_auth" > < a class = "header" href = "#check_3pid_auth" > < code > check_3pid_auth< / code > < / a > < / h3 >
< p > < em > First introduced in Synapse v1.46.0< / em > < / p >
< pre > < code class = "language-python" > async def check_3pid_auth(
medium: str,
address: str,
password: str,
) -> Optional[
Tuple[
str,
Optional[Callable[[" synapse.module_api.LoginResponse" ], Awaitable[None]]]
]
]
< / code > < / pre >
< p > Called when a user attempts to register or log in with a third party identifier,
such as email. It is passed the medium (eg. < code > email< / code > ), an address (eg. < code > jdoe@example.com< / code > )
and the user's password.< / p >
< p > If the authentication is successful, the module must return the user's Matrix ID (e.g.
< code > @alice:example.com< / code > ) and optionally a callback to be called with the response to the < code > /login< / code > request.
If the module doesn't wish to return a callback, it must return None instead.< / p >
< p > If the authentication is unsuccessful, the module 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 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)
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