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<h1 id="password-auth-provider-modules"><a class="header" href="#password-auth-provider-modules">Password auth provider modules</a></h1>
<p>Password auth providers offer a way for server administrators to
integrate their Synapse installation with an existing authentication
system.</p>
<p>A password auth provider is a Python class which is dynamically loaded
into Synapse, and provides a number of methods by which it can integrate
with the authentication system.</p>
<p>This document serves as a reference for those looking to implement their
own password auth providers. Additionally, here is a list of known
password auth provider module implementations:</p>
<ul>
<li><a href="https://github.com/matrix-org/matrix-synapse-ldap3/">matrix-synapse-ldap3</a></li>
<li><a href="https://github.com/devture/matrix-synapse-shared-secret-auth">matrix-synapse-shared-secret-auth</a></li>
<li><a href="https://github.com/ma1uta/matrix-synapse-rest-password-provider">matrix-synapse-rest-password-provider</a></li>
</ul>
<h2 id="required-methods"><a class="header" href="#required-methods">Required methods</a></h2>
<p>Password auth provider classes must provide the following methods:</p>
<ul>
<li>
<p><code>parse_config(config)</code>
This method is passed the <code>config</code> object for this module from the
homeserver configuration file.</p>
<p>It should perform any appropriate sanity checks on the provided
configuration, and return an object which is then passed into
<code>__init__</code>.</p>
<p>This method should have the <code>@staticmethod</code> decoration.</p>
</li>
<li>
<p><code>__init__(self, config, account_handler)</code></p>
<p>The constructor is passed the config object returned by
<code>parse_config</code>, and a <code>synapse.module_api.ModuleApi</code> object which
allows the password provider to check if accounts exist and/or create
new ones.</p>
</li>
</ul>
<h2 id="optional-methods"><a class="header" href="#optional-methods">Optional methods</a></h2>
<p>Password auth provider classes may optionally provide the following methods:</p>
<ul>
<li>
<p><code>get_db_schema_files(self)</code></p>
<p>This method, if implemented, should return an Iterable of
<code>(name, stream)</code> pairs of database schema files. Each file is applied
in turn at initialisation, and a record is then made in the database
so that it is not re-applied on the next start.</p>
</li>
<li>
<p><code>get_supported_login_types(self)</code></p>
<p>This method, if implemented, should return a <code>dict</code> mapping from a
login type identifier (such as <code>m.login.password</code>) to an iterable
giving the fields which must be provided by the user in the submission
to <a href="https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-login">the <code>/login</code> API</a>.
These fields are passed in the <code>login_dict</code> dictionary to <code>check_auth</code>.</p>
<p>For example, if a password auth provider wants to implement a custom
login type of <code>com.example.custom_login</code>, where the client is expected
to pass the fields <code>secret1</code> and <code>secret2</code>, the provider should
implement this method and return the following dict:</p>
<pre><code class="language-python">{"com.example.custom_login": ("secret1", "secret2")}
</code></pre>
</li>
<li>
<p><code>check_auth(self, username, login_type, login_dict)</code></p>
<p>This method does the real work. If implemented, it
will be called for each login attempt where the login type matches one
of the keys returned by <code>get_supported_login_types</code>.</p>
<p>It is passed the (possibly unqualified) <code>user</code> field provided by the client,
the login type, and a dictionary of login secrets passed by the
client.</p>
<p>The method should return an <code>Awaitable</code> object, which resolves
to the canonical <code>@localpart:domain</code> user ID if authentication is
successful, and <code>None</code> if not.</p>
<p>Alternatively, the <code>Awaitable</code> can resolve to a <code>(str, func)</code> tuple, in
which case the second field is a callback which will be called with
the result from the <code>/login</code> call (including <code>access_token</code>,
<code>device_id</code>, etc.)</p>
</li>
<li>
<p><code>check_3pid_auth(self, medium, address, password)</code></p>
<p>This method, if implemented, is called when a user attempts to
register or log in with a third party identifier, such as email. It is
passed the medium (ex. "email"), an address (ex.
"<a href="mailto:jdoe@example.com">jdoe@example.com</a>") and the user's password.</p>
<p>The method should return an <code>Awaitable</code> object, which resolves
to a <code>str</code> containing the user's (canonical) User id if
authentication was successful, and <code>None</code> if not.</p>
<p>As with <code>check_auth</code>, the <code>Awaitable</code> may alternatively resolve to a
<code>(user_id, callback)</code> tuple.</p>
</li>
<li>
<p><code>check_password(self, user_id, password)</code></p>
<p>This method provides a simpler interface than
<code>get_supported_login_types</code> and <code>check_auth</code> for password auth
providers that just want to provide a mechanism for validating
<code>m.login.password</code> logins.</p>
<p>If implemented, it will be called to check logins with an
<code>m.login.password</code> login type. It is passed a qualified
<code>@localpart:domain</code> user id, and the password provided by the user.</p>
<p>The method should return an <code>Awaitable</code> object, which resolves
to <code>True</code> if authentication is successful, and <code>False</code> if not.</p>
</li>
<li>
<p><code>on_logged_out(self, user_id, device_id, access_token)</code></p>
<p>This method, if implemented, is called when a user logs out. 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>It may return an <code>Awaitable</code> object; the logout request will
wait for the <code>Awaitable</code> to complete, but the result is ignored.</p>
</li>
</ul>
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