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100 lines
4.2 KiB
ReStructuredText
100 lines
4.2 KiB
ReStructuredText
Password auth provider modules
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==============================
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Password auth providers offer a way for server administrators to integrate
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their Synapse installation with an existing authentication system.
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A password auth provider is a Python class which is dynamically loaded into
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Synapse, and provides a number of methods by which it can integrate with the
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authentication system.
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This document serves as a reference for those looking to implement their own
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password auth providers.
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Required methods
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----------------
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Password auth provider classes must provide the following methods:
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*class* ``SomeProvider.parse_config``\(*config*)
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This method is passed the ``config`` object for this module from the
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homeserver configuration file.
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It should perform any appropriate sanity checks on the provided
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configuration, and return an object which is then passed into ``__init__``.
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*class* ``SomeProvider``\(*config*, *account_handler*)
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The constructor is passed the config object returned by ``parse_config``,
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and a ``synapse.handlers.auth._AccountHandler`` object which allows the
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password provider to check if accounts exist and/or create new ones.
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Optional methods
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----------------
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Password auth provider classes may optionally provide the following methods.
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*class* ``SomeProvider.get_db_schema_files``\()
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This method, if implemented, should return an Iterable of ``(name,
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stream)`` pairs of database schema files. Each file is applied in turn at
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initialisation, and a record is then made in the database so that it is
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not re-applied on the next start.
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``someprovider.get_supported_login_types``\()
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This method, if implemented, should return a ``dict`` mapping from a login
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type identifier (such as ``m.login.password``) to an iterable giving the
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fields which must be provided by the user in the submission to the
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``/login`` api. These fields are passed in the ``login_dict`` dictionary
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to ``check_auth``.
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For example, if a password auth provider wants to implement a custom login
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type of ``com.example.custom_login``, where the client is expected to pass
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the fields ``secret1`` and ``secret2``, the provider should implement this
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method and return the following dict::
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{"com.example.custom_login": ("secret1", "secret2")}
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``someprovider.check_auth``\(*username*, *login_type*, *login_dict*)
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This method is the one that does the real work. If implemented, it will be
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called for each login attempt where the login type matches one of the keys
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returned by ``get_supported_login_types``.
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It is passed the (possibly UNqualified) ``user`` provided by the client,
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the login type, and a dictionary of login secrets passed by the client.
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The method should return a Twisted ``Deferred`` object, which resolves to
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the canonical ``@localpart:domain`` user id if authentication is successful,
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and ``None`` if not.
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Alternatively, the ``Deferred`` can resolve to a ``(str, func)`` tuple, in
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which case the second field is a callback which will be called with the
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result from the ``/login`` call (including ``access_token``, ``device_id``,
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etc.)
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``someprovider.check_password``\(*user_id*, *password*)
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This method provides a simpler interface than ``get_supported_login_types``
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and ``check_auth`` for password auth providers that just want to provide a
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mechanism for validating ``m.login.password`` logins.
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Iif implemented, it will be called to check logins with an
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``m.login.password`` login type. It is passed a qualified
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``@localpart:domain`` user id, and the password provided by the user.
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The method should return a Twisted ``Deferred`` object, which resolves to
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``True`` if authentication is successful, and ``False`` if not.
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``someprovider.on_logged_out``\(*user_id*, *device_id*, *access_token*)
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This method, if implemented, is called when a user logs out. It is passed
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the qualified user ID, the ID of the deactivated device (if any: access
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tokens are occasionally created without an associated device ID), and the
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(now deactivated) access token.
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It may return a Twisted ``Deferred`` object; the logout request will wait
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for the deferred to complete but the result is ignored.
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