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Details such as user ID localpart, displayname, and even avatar +URLs are all things that can be mapped from talking to a SSO service.</p> +<p>As an example, a SSO service may return the email address +"john.smith@example.com" for a user, whereas Synapse will need to figure out how +to turn that into a displayname when creating a Matrix user for this individual. +It may choose <code>John Smith</code>, or <code>Smith, John [Example.com]</code> or any number of +variations. As each Synapse configuration may want something different, this is +where SAML mapping providers come into play.</p> +<p>SSO mapping providers are currently supported for OpenID and SAML SSO +configurations. Please see the details below for how to implement your own.</p> +<p>It is up to the mapping provider whether the user should be assigned a predefined +Matrix ID based on the SSO attributes, or if the user should be allowed to +choose their own username.</p> +<p>In the first case - where users are automatically allocated a Matrix ID - it is +the responsibility of the mapping provider to normalise the SSO attributes and +map them to a valid Matrix ID. The <a href="https://matrix.org/docs/spec/appendices#user-identifiers">specification for Matrix +IDs</a> has some +information about what is considered valid.</p> +<p>If the mapping provider does not assign a Matrix ID, then Synapse will +automatically serve an HTML page allowing the user to pick their own username.</p> +<p>External mapping providers are provided to Synapse in the form of an external +Python module. You can retrieve this module from <a href="https://pypi.org">PyPI</a> or elsewhere, +but it must be importable via Synapse (e.g. it must be in the same virtualenv +as Synapse). The Synapse config is then modified to point to the mapping provider +(and optionally provide additional configuration for it).</p> +<h2 id="openid-mapping-providers"><a class="header" href="#openid-mapping-providers">OpenID Mapping Providers</a></h2> +<p>The OpenID mapping provider can be customized by editing the +<code>oidc_config.user_mapping_provider.module</code> config option.</p> +<p><code>oidc_config.user_mapping_provider.config</code> allows you to provide custom +configuration options to the module. Check with the module's documentation for +what options it provides (if any). The options listed by default are for the +user mapping provider built in to Synapse. If using a custom module, you should +comment these options out and use those specified by the module instead.</p> +<h3 id="building-a-custom-openid-mapping-provider"><a class="header" href="#building-a-custom-openid-mapping-provider">Building a Custom OpenID Mapping Provider</a></h3> +<p>A custom mapping provider must specify the following methods:</p> +<ul> +<li><code>def __init__(self, parsed_config)</code> +<ul> +<li>Arguments: +<ul> +<li><code>parsed_config</code> - A configuration object that is the return value of the +<code>parse_config</code> method. You should set any configuration options needed by +the module here.</li> +</ul> +</li> +</ul> +</li> +<li><code>def parse_config(config)</code> +<ul> +<li>This method should have the <code>@staticmethod</code> decoration.</li> +<li>Arguments: +<ul> +<li><code>config</code> - A <code>dict</code> representing the parsed content of the +<code>oidc_config.user_mapping_provider.config</code> homeserver config option. +Runs on homeserver startup. Providers should extract and validate +any option values they need here.</li> +</ul> +</li> +<li>Whatever is returned will be passed back to the user mapping provider module's +<code>__init__</code> method during construction.</li> +</ul> +</li> +<li><code>def get_remote_user_id(self, userinfo)</code> +<ul> +<li>Arguments: +<ul> +<li><code>userinfo</code> - A <code>authlib.oidc.core.claims.UserInfo</code> object to extract user +information from.</li> +</ul> +</li> +<li>This method must return a string, which is the unique, immutable identifier +for the user. Commonly the <code>sub</code> claim of the response.</li> +</ul> +</li> +<li><code>async def map_user_attributes(self, userinfo, token, failures)</code> +<ul> +<li>This method must be async.</li> +<li>Arguments: +<ul> +<li><code>userinfo</code> - A <code>authlib.oidc.core.claims.UserInfo</code> object to extract user +information from.</li> +<li><code>token</code> - A dictionary which includes information necessary to make +further requests to the OpenID provider.</li> +<li><code>failures</code> - An <code>int</code> that represents the amount of times the returned +mxid localpart mapping has failed. This should be used +to create a deduplicated mxid localpart which should be +returned instead. For example, if this method returns +<code>john.doe</code> as the value of <code>localpart</code> in the returned +dict, and that is already taken on the homeserver, this +method will be called again with the same parameters but +with failures=1. The method should then return a different +<code>localpart</code> value, such as <code>john.doe1</code>.</li> +</ul> +</li> +<li>Returns a dictionary with two keys: +<ul> +<li><code>localpart</code>: A string, used to generate the Matrix ID. If this is +<code>None</code>, the user is prompted to pick their own username. This is only used +during a user's first login. Once a localpart has been associated with a +remote user ID (see <code>get_remote_user_id</code>) it cannot be updated.</li> +<li><code>displayname</code>: An optional string, the display name for the user.</li> +</ul> +</li> +</ul> +</li> +<li><code>async def get_extra_attributes(self, userinfo, token)</code> +<ul> +<li> +<p>This method must be async.</p> +</li> +<li> +<p>Arguments:</p> +<ul> +<li><code>userinfo</code> - A <code>authlib.oidc.core.claims.UserInfo</code> object to extract user +information from.</li> +<li><code>token</code> - A dictionary which includes information necessary to make +further requests to the OpenID provider.</li> +</ul> +</li> +<li> +<p>Returns a dictionary that is suitable to be serialized to JSON. This +will be returned as part of the response during a successful login.</p> +<p>Note that care should be taken to not overwrite any of the parameters +usually returned as part of the <a href="https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-login">login response</a>.</p> +</li> +</ul> +</li> +</ul> +<h3 id="default-openid-mapping-provider"><a class="header" href="#default-openid-mapping-provider">Default OpenID Mapping Provider</a></h3> +<p>Synapse has a built-in OpenID mapping provider if a custom provider isn't +specified in the config. It is located at +<a href="https://github.com/matrix-org/synapse/blob/develop/synapse/handlers/oidc.py"><code>synapse.handlers.oidc.JinjaOidcMappingProvider</code></a>.</p> +<h2 id="saml-mapping-providers"><a class="header" href="#saml-mapping-providers">SAML Mapping Providers</a></h2> +<p>The SAML mapping provider can be customized by editing the +<code>saml2_config.user_mapping_provider.module</code> config option.</p> +<p><code>saml2_config.user_mapping_provider.config</code> allows you to provide custom +configuration options to the module. Check with the module's documentation for +what options it provides (if any). The options listed by default are for the +user mapping provider built in to Synapse. If using a custom module, you should +comment these options out and use those specified by the module instead.</p> +<h3 id="building-a-custom-saml-mapping-provider"><a class="header" href="#building-a-custom-saml-mapping-provider">Building a Custom SAML Mapping Provider</a></h3> +<p>A custom mapping provider must specify the following methods:</p> +<ul> +<li><code>def __init__(self, parsed_config, module_api)</code> +<ul> +<li>Arguments: +<ul> +<li><code>parsed_config</code> - A configuration object that is the return value of the +<code>parse_config</code> method. You should set any configuration options needed by +the module here.</li> +<li><code>module_api</code> - a <code>synapse.module_api.ModuleApi</code> object which provides the +stable API available for extension modules.</li> +</ul> +</li> +</ul> +</li> +<li><code>def parse_config(config)</code> +<ul> +<li><strong>This method should have the <code>@staticmethod</code> decoration.</strong></li> +<li>Arguments: +<ul> +<li><code>config</code> - A <code>dict</code> representing the parsed content of the +<code>saml_config.user_mapping_provider.config</code> homeserver config option. +Runs on homeserver startup. Providers should extract and validate +any option values they need here.</li> +</ul> +</li> +<li>Whatever is returned will be passed back to the user mapping provider module's +<code>__init__</code> method during construction.</li> +</ul> +</li> +<li><code>def get_saml_attributes(config)</code> +<ul> +<li><strong>This method should have the <code>@staticmethod</code> decoration.</strong></li> +<li>Arguments: +<ul> +<li><code>config</code> - A object resulting from a call to <code>parse_config</code>.</li> +</ul> +</li> +<li>Returns a tuple of two sets. The first set equates to the SAML auth +response attributes that are required for the module to function, whereas +the second set consists of those attributes which can be used if available, +but are not necessary.</li> +</ul> +</li> +<li><code>def get_remote_user_id(self, saml_response, client_redirect_url)</code> +<ul> +<li>Arguments: +<ul> +<li><code>saml_response</code> - A <code>saml2.response.AuthnResponse</code> object to extract user +information from.</li> +<li><code>client_redirect_url</code> - A string, the URL that the client will be +redirected to.</li> +</ul> +</li> +<li>This method must return a string, which is the unique, immutable identifier +for the user. Commonly the <code>uid</code> claim of the response.</li> +</ul> +</li> +<li><code>def saml_response_to_user_attributes(self, saml_response, failures, client_redirect_url)</code> +<ul> +<li> +<p>Arguments:</p> +<ul> +<li><code>saml_response</code> - A <code>saml2.response.AuthnResponse</code> object to extract user +information from.</li> +<li><code>failures</code> - An <code>int</code> that represents the amount of times the returned +mxid localpart mapping has failed. This should be used +to create a deduplicated mxid localpart which should be +returned instead. For example, if this method returns +<code>john.doe</code> as the value of <code>mxid_localpart</code> in the returned +dict, and that is already taken on the homeserver, this +method will be called again with the same parameters but +with failures=1. The method should then return a different +<code>mxid_localpart</code> value, such as <code>john.doe1</code>.</li> +<li><code>client_redirect_url</code> - A string, the URL that the client will be +redirected to.</li> +</ul> +</li> +<li> +<p>This method must return a dictionary, which will then be used by Synapse +to build a new user. The following keys are allowed:</p> +<ul> +<li><code>mxid_localpart</code> - A string, the mxid localpart of the new user. If this is +<code>None</code>, the user is prompted to pick their own username. This is only used +during a user's first login. Once a localpart has been associated with a +remote user ID (see <code>get_remote_user_id</code>) it cannot be updated.</li> +<li><code>displayname</code> - The displayname of the new user. If not provided, will default to +the value of <code>mxid_localpart</code>.</li> +<li><code>emails</code> - A list of emails for the new user. If not provided, will +default to an empty list.</li> +</ul> +<p>Alternatively it can raise a <code>synapse.api.errors.RedirectException</code> to +redirect the user to another page. This is useful to prompt the user for +additional information, e.g. if you want them to provide their own username. +It is the responsibility of the mapping provider to either redirect back +to <code>client_redirect_url</code> (including any additional information) or to +complete registration using methods from the <code>ModuleApi</code>.</p> +</li> +</ul> +</li> +</ul> +<h3 id="default-saml-mapping-provider"><a class="header" href="#default-saml-mapping-provider">Default SAML Mapping Provider</a></h3> +<p>Synapse has a built-in SAML mapping provider if a custom provider isn't +specified in the config. It is located at +<a href="https://github.com/matrix-org/synapse/blob/develop/synapse/handlers/saml.py"><code>synapse.handlers.saml.DefaultSamlMappingProvider</code></a>.</p> + + </main> + + <nav class="nav-wrapper" aria-label="Page navigation"> + <!-- Mobile navigation buttons --> + <a rel="prev" href="usage/configuration/user_authentication/single_sign_on/cas.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + <a rel="next" href="password_auth_providers.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + <div style="clear: both"></div> + </nav> + </div> + </div> + + <nav class="nav-wide-wrapper" aria-label="Page navigation"> + <a rel="prev" href="usage/configuration/user_authentication/single_sign_on/cas.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + <a rel="next" href="password_auth_providers.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + </nav> + + </div> + + <script type="text/javascript"> + window.playground_copyable = true; + </script> + <script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script> + <script src="mark.min.js" type="text/javascript" charset="utf-8"></script> + <script src="searcher.js" type="text/javascript" charset="utf-8"></script> + <script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script> + <script src="highlight.js" type="text/javascript" charset="utf-8"></script> + <script src="book.js" type="text/javascript" charset="utf-8"></script> + + <!-- Custom JS scripts --> + <script type="text/javascript" src="docs/website_files/table-of-contents.js"></script> + </body> +</html> \ No newline at end of file |