RISCI_ATOM
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synapse
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                    <h1 class="menu-title">Synapse</h1>

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                        <h1 id="configuring-synapse-to-authenticate-against-an-openid-connect-provider"><a class="header" href="#configuring-synapse-to-authenticate-against-an-openid-connect-provider">Configuring Synapse to authenticate against an OpenID Connect provider</a></h1>
<p>Synapse can be configured to use an OpenID Connect Provider (OP) for
authentication, instead of its own local password database.</p>
<p>Any OP should work with Synapse, as long as it supports the authorization code
flow. There are a few options for that:</p>
<ul>
<li>
<p>start a local OP. Synapse has been tested with <a href="https://www.ory.sh/docs/hydra/">Hydra</a> and
<a href="https://github.com/dexidp/dex">Dex</a>.  Note that for an OP to work, it should be served under a
secure (HTTPS) origin.  A certificate signed with a self-signed, locally
trusted CA should work. In that case, start Synapse with a <code>SSL_CERT_FILE</code>
environment variable set to the path of the CA.</p>
</li>
<li>
<p>set up a SaaS OP, like <a href="https://developers.google.com/identity/protocols/oauth2/openid-connect">Google</a>, <a href="https://auth0.com/">Auth0</a> or
<a href="https://www.okta.com/">Okta</a>. Synapse has been tested with Auth0 and Google.</p>
</li>
</ul>
<p>It may also be possible to use other OAuth2 providers which provide the
<a href="https://tools.ietf.org/html/rfc6749#section-4.1">authorization code grant type</a>,
such as <a href="https://developer.github.com/apps/building-oauth-apps/authorizing-oauth-apps">Github</a>.</p>
<h2 id="preparing-synapse"><a class="header" href="#preparing-synapse">Preparing Synapse</a></h2>
<p>The OpenID integration in Synapse uses the
<a href="https://pypi.org/project/Authlib/"><code>authlib</code></a> library, which must be installed
as follows:</p>
<ul>
<li>
<p>The relevant libraries are included in the Docker images and Debian packages
provided by <code>matrix.org</code> so no further action is needed.</p>
</li>
<li>
<p>If you installed Synapse into a virtualenv, run <code>/path/to/env/bin/pip install matrix-synapse[oidc]</code> to install the necessary dependencies.</p>
</li>
<li>
<p>For other installation mechanisms, see the documentation provided by the
maintainer.</p>
</li>
</ul>
<p>To enable the OpenID integration, you should then add a section to the <code>oidc_providers</code>
setting in your configuration file.
See the <a href="usage/configuration/config_documentation.html#oidc_providers">configuration manual</a> for some sample settings, as well as
the text below for example configurations for specific providers.</p>
<h2 id="oidc-back-channel-logout"><a class="header" href="#oidc-back-channel-logout">OIDC Back-Channel Logout</a></h2>
<p>Synapse supports receiving <a href="https://openid.net/specs/openid-connect-backchannel-1_0.html">OpenID Connect Back-Channel Logout</a> notifications.</p>
<p>This lets the OpenID Connect Provider notify Synapse when a user logs out, so that Synapse can end that user session.
This feature can be enabled by setting the <code>backchannel_logout_enabled</code> property to <code>true</code> in the provider configuration, and setting the following URL as destination for Back-Channel Logout notifications in your OpenID Connect Provider: <code>[synapse public baseurl]/_synapse/client/oidc/backchannel_logout</code></p>
<h2 id="sample-configs"><a class="header" href="#sample-configs">Sample configs</a></h2>
<p>Here are a few configs for providers that should work with Synapse.</p>
<h3 id="microsoft-azure-active-directory"><a class="header" href="#microsoft-azure-active-directory">Microsoft Azure Active Directory</a></h3>
<p>Azure AD can act as an OpenID Connect Provider. Register a new application under
<em>App registrations</em> in the Azure AD management console. The RedirectURI for your
application should point to your matrix server:
<code>[synapse public baseurl]/_synapse/client/oidc/callback</code></p>
<p>Go to <em>Certificates &amp; secrets</em> and register a new client secret. Make note of your
Directory (tenant) ID as it will be used in the Azure links.
Edit your Synapse config file and change the <code>oidc_config</code> section:</p>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: microsoft
    idp_name: Microsoft
    issuer: &quot;https://login.microsoftonline.com/&lt;tenant id&gt;/v2.0&quot;
    client_id: &quot;&lt;client id&gt;&quot;
    client_secret: &quot;&lt;client secret&gt;&quot;
    scopes: [&quot;openid&quot;, &quot;profile&quot;]
    authorization_endpoint: &quot;https://login.microsoftonline.com/&lt;tenant id&gt;/oauth2/v2.0/authorize&quot;
    token_endpoint: &quot;https://login.microsoftonline.com/&lt;tenant id&gt;/oauth2/v2.0/token&quot;
    userinfo_endpoint: &quot;https://graph.microsoft.com/oidc/userinfo&quot;

    user_mapping_provider:
      config:
        localpart_template: &quot;{{ user.preferred_username.split('@')[0] }}&quot;
        display_name_template: &quot;{{ user.name }}&quot;
</code></pre>
<h3 id="apple"><a class="header" href="#apple">Apple</a></h3>
<p>Configuring &quot;Sign in with Apple&quot; (SiWA) requires an Apple Developer account.</p>
<p>You will need to create a new &quot;Services ID&quot; for SiWA, and create and download a
private key with &quot;SiWA&quot; enabled.</p>
<p>As well as the private key file, you will need:</p>
<ul>
<li>Client ID: the &quot;identifier&quot; you gave the &quot;Services ID&quot;</li>
<li>Team ID: a 10-character ID associated with your developer account.</li>
<li>Key ID: the 10-character identifier for the key.</li>
</ul>
<p><a href="https://help.apple.com/developer-account/?lang=en#/dev77c875b7e">Apple's developer documentation</a>
has more information on setting up SiWA.</p>
<p>The synapse config will look like this:</p>
<pre><code class="language-yaml">  - idp_id: apple
    idp_name: Apple
    issuer: &quot;https://appleid.apple.com&quot;
    client_id: &quot;your-client-id&quot; # Set to the &quot;identifier&quot; for your &quot;ServicesID&quot;
    client_auth_method: &quot;client_secret_post&quot;
    client_secret_jwt_key:
      key_file: &quot;/path/to/AuthKey_KEYIDCODE.p8&quot;  # point to your key file
      jwt_header:
        alg: ES256
        kid: &quot;KEYIDCODE&quot;   # Set to the 10-char Key ID
      jwt_payload:
        iss: TEAMIDCODE    # Set to the 10-char Team ID
    scopes: [&quot;name&quot;, &quot;email&quot;, &quot;openid&quot;]
    authorization_endpoint: https://appleid.apple.com/auth/authorize?response_mode=form_post
    user_mapping_provider:
      config:
        email_template: &quot;{{ user.email }}&quot;
</code></pre>
<h3 id="auth0"><a class="header" href="#auth0">Auth0</a></h3>
<p><a href="https://auth0.com/">Auth0</a> is a hosted SaaS IdP solution.</p>
<ol>
<li>
<p>Create a regular web application for Synapse</p>
</li>
<li>
<p>Set the Allowed Callback URLs to <code>[synapse public baseurl]/_synapse/client/oidc/callback</code></p>
</li>
<li>
<p>Add a rule with any name to add the <code>preferred_username</code> claim. 
(See https://auth0.com/docs/customize/rules/create-rules for more information on how to create rules.)</p>
<details>
 <summary>Code sample</summary>
<pre><code class="language-js">function addPersistenceAttribute(user, context, callback) {
  user.user_metadata = user.user_metadata || {};
  user.user_metadata.preferred_username = user.user_metadata.preferred_username || user.user_id;
  context.idToken.preferred_username = user.user_metadata.preferred_username;

  auth0.users.updateUserMetadata(user.user_id, user.user_metadata)
    .then(function(){
        callback(null, user, context);
    })
    .catch(function(err){
        callback(err);
    });
}
</code></pre>
</li>
</ol>
</details>
<p>Synapse config:</p>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: auth0
    idp_name: Auth0
    issuer: &quot;https://your-tier.eu.auth0.com/&quot; # TO BE FILLED
    client_id: &quot;your-client-id&quot; # TO BE FILLED
    client_secret: &quot;your-client-secret&quot; # TO BE FILLED
    scopes: [&quot;openid&quot;, &quot;profile&quot;]
    user_mapping_provider:
      config:
        localpart_template: &quot;{{ user.preferred_username }}&quot;
        display_name_template: &quot;{{ user.name }}&quot;
</code></pre>
<h3 id="authentik"><a class="header" href="#authentik">Authentik</a></h3>
<p><a href="https://goauthentik.io/">Authentik</a> is an open-source IdP solution.</p>
<ol>
<li>Create a provider in Authentik, with type OAuth2/OpenID.</li>
<li>The parameters are:</li>
</ol>
<ul>
<li>Client Type: Confidential</li>
<li>JWT Algorithm: RS256</li>
<li>Scopes: OpenID, Email and Profile</li>
<li>RSA Key: Select any available key</li>
<li>Redirect URIs: <code>[synapse public baseurl]/_synapse/client/oidc/callback</code></li>
</ul>
<ol start="3">
<li>Create an application for synapse in Authentik and link it to the provider.</li>
<li>Note the slug of your application, Client ID and Client Secret.</li>
</ol>
<p>Note: RSA keys must be used for signing for Authentik, ECC keys do not work.</p>
<p>Synapse config:</p>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: authentik
    idp_name: authentik
    discover: true
    issuer: &quot;https://your.authentik.example.org/application/o/your-app-slug/&quot; # TO BE FILLED: domain and slug
    client_id: &quot;your client id&quot; # TO BE FILLED
    client_secret: &quot;your client secret&quot; # TO BE FILLED
    scopes:
      - &quot;openid&quot;
      - &quot;profile&quot;
      - &quot;email&quot;
    user_mapping_provider:
      config:
        localpart_template: &quot;{{ user.preferred_username }}&quot;
        display_name_template: &quot;{{ user.preferred_username|capitalize }}&quot; # TO BE FILLED: If your users have names in Authentik and you want those in Synapse, this should be replaced with user.name|capitalize.
</code></pre>
<h3 id="dex"><a class="header" href="#dex">Dex</a></h3>
<p><a href="https://github.com/dexidp/dex">Dex</a> is a simple, open-source OpenID Connect Provider.
Although it is designed to help building a full-blown provider with an
external database, it can be configured with static passwords in a config file.</p>
<p>Follow the <a href="https://dexidp.io/docs/getting-started/">Getting Started guide</a>
to install Dex.</p>
<p>Edit <code>examples/config-dev.yaml</code> config file from the Dex repo to add a client:</p>
<pre><code class="language-yaml">staticClients:
- id: synapse
  secret: secret
  redirectURIs:
  - '[synapse public baseurl]/_synapse/client/oidc/callback'
  name: 'Synapse'
</code></pre>
<p>Run with <code>dex serve examples/config-dev.yaml</code>.</p>
<p>Synapse config:</p>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: dex
    idp_name: &quot;My Dex server&quot;
    skip_verification: true # This is needed as Dex is served on an insecure endpoint
    issuer: &quot;http://127.0.0.1:5556/dex&quot;
    client_id: &quot;synapse&quot;
    client_secret: &quot;secret&quot;
    scopes: [&quot;openid&quot;, &quot;profile&quot;]
    user_mapping_provider:
      config:
        localpart_template: &quot;{{ user.name }}&quot;
        display_name_template: &quot;{{ user.name|capitalize }}&quot;
</code></pre>
<h3 id="django-oauth-toolkit"><a class="header" href="#django-oauth-toolkit">Django OAuth Toolkit</a></h3>
<p><a href="https://github.com/jazzband/django-oauth-toolkit">django-oauth-toolkit</a> is a
Django application providing out of the box all the endpoints, data and logic
needed to add OAuth2 capabilities to your Django projects. It supports
<a href="https://django-oauth-toolkit.readthedocs.io/en/latest/oidc.html">OpenID Connect too</a>.</p>
<p>Configuration on Django's side:</p>
<ol>
<li>Add an application: <code>https://example.com/admin/oauth2_provider/application/add/</code> and choose parameters like this:</li>
</ol>
<ul>
<li><code>Redirect uris</code>: <code>https://synapse.example.com/_synapse/client/oidc/callback</code></li>
<li><code>Client type</code>: <code>Confidential</code></li>
<li><code>Authorization grant type</code>: <code>Authorization code</code></li>
<li><code>Algorithm</code>: <code>HMAC with SHA-2 256</code></li>
</ul>
<ol start="2">
<li>
<p>You can <a href="https://django-oauth-toolkit.readthedocs.io/en/latest/oidc.html#customizing-the-oidc-responses">customize the claims</a> Django gives to synapse (optional):</p>
<details>
 <summary>Code sample</summary>
<pre><code class="language-python">class CustomOAuth2Validator(OAuth2Validator):

    def get_additional_claims(self, request):
        return {
            &quot;sub&quot;: request.user.email,
            &quot;email&quot;: request.user.email,
            &quot;first_name&quot;: request.user.first_name,
            &quot;last_name&quot;: request.user.last_name,
        }
</code></pre>
</details>
</li>
</ol>
<p>Your synapse config is then:</p>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: django_example
    idp_name: &quot;Django Example&quot;
    issuer: &quot;https://example.com/o/&quot;
    client_id: &quot;your-client-id&quot;  # CHANGE ME
    client_secret: &quot;your-client-secret&quot;  # CHANGE ME
    scopes: [&quot;openid&quot;]
    user_profile_method: &quot;userinfo_endpoint&quot;  # needed because oauth-toolkit does not include user information in the authorization response
    user_mapping_provider:
      config:
        localpart_template: &quot;{{ user.email.split('@')[0] }}&quot;
        display_name_template: &quot;{{ user.first_name }} {{ user.last_name }}&quot;
        email_template: &quot;{{ user.email }}&quot;
</code></pre>
<h3 id="facebook"><a class="header" href="#facebook">Facebook</a></h3>
<ol start="0">
<li>You will need a Facebook developer account. You can register for one
<a href="https://developers.facebook.com/async/registration/">here</a>.</li>
<li>On the <a href="https://developers.facebook.com/apps/">apps</a> page of the developer
console, &quot;Create App&quot;, and choose &quot;Build Connected Experiences&quot;.</li>
<li>Once the app is created, add &quot;Facebook Login&quot; and choose &quot;Web&quot;. You don't
need to go through the whole form here.</li>
<li>In the left-hand menu, open &quot;Products&quot;/&quot;Facebook Login&quot;/&quot;Settings&quot;.
<ul>
<li>Add <code>[synapse public baseurl]/_synapse/client/oidc/callback</code> as an OAuth Redirect
URL.</li>
</ul>
</li>
<li>In the left-hand menu, open &quot;Settings/Basic&quot;. Here you can copy the &quot;App ID&quot;
and &quot;App Secret&quot; for use below.</li>
</ol>
<p>Synapse config:</p>
<pre><code class="language-yaml">  - idp_id: facebook
    idp_name: Facebook
    idp_brand: &quot;facebook&quot;  # optional: styling hint for clients
    discover: false
    issuer: &quot;https://www.facebook.com&quot;
    client_id: &quot;your-client-id&quot; # TO BE FILLED
    client_secret: &quot;your-client-secret&quot; # TO BE FILLED
    scopes: [&quot;openid&quot;, &quot;email&quot;]
    authorization_endpoint: &quot;https://facebook.com/dialog/oauth&quot;
    token_endpoint: &quot;https://graph.facebook.com/v9.0/oauth/access_token&quot;
    jwks_uri: &quot;https://www.facebook.com/.well-known/oauth/openid/jwks/&quot;
    user_mapping_provider:
      config:
        display_name_template: &quot;{{ user.name }}&quot;
        email_template: &quot;{{ user.email }}&quot;
</code></pre>
<p>Relevant documents:</p>
<ul>
<li><a href="https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow">Manually Build a Login Flow</a></li>
<li><a href="https://developers.facebook.com/docs/graph-api/using-graph-api/">Using Facebook's Graph API</a></li>
<li><a href="https://developers.facebook.com/docs/graph-api/reference/user">Reference to the User endpoint</a></li>
</ul>
<p>Facebook do have an <a href="https://www.facebook.com/.well-known/openid-configuration">OIDC discovery endpoint</a>,
but it has a <code>response_types_supported</code> which excludes &quot;code&quot; (which we rely on, and
is even mentioned in their <a href="https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow#login">documentation</a>),
so we have to disable discovery and configure the URIs manually.</p>
<h3 id="github"><a class="header" href="#github">GitHub</a></h3>
<p><a href="https://developer.github.com/apps/building-oauth-apps/authorizing-oauth-apps">GitHub</a> is a bit special as it is not an OpenID Connect compliant provider, but
just a regular OAuth2 provider.</p>
<p>The <a href="https://developer.github.com/v3/users/#get-the-authenticated-user"><code>/user</code> API endpoint</a>
can be used to retrieve information on the authenticated user. As the Synapse
login mechanism needs an attribute to uniquely identify users, and that endpoint
does not return a <code>sub</code> property, an alternative <code>subject_claim</code> has to be set.</p>
<ol>
<li>Create a new OAuth application: <a href="https://github.com/settings/applications/new">https://github.com/settings/applications/new</a>.</li>
<li>Set the callback URL to <code>[synapse public baseurl]/_synapse/client/oidc/callback</code>.</li>
</ol>
<p>Synapse config:</p>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: github
    idp_name: Github
    idp_brand: &quot;github&quot;  # optional: styling hint for clients
    discover: false
    issuer: &quot;https://github.com/&quot;
    client_id: &quot;your-client-id&quot; # TO BE FILLED
    client_secret: &quot;your-client-secret&quot; # TO BE FILLED
    authorization_endpoint: &quot;https://github.com/login/oauth/authorize&quot;
    token_endpoint: &quot;https://github.com/login/oauth/access_token&quot;
    userinfo_endpoint: &quot;https://api.github.com/user&quot;
    scopes: [&quot;read:user&quot;]
    user_mapping_provider:
      config:
        subject_claim: &quot;id&quot;
        localpart_template: &quot;{{ user.login }}&quot;
        display_name_template: &quot;{{ user.name }}&quot;
</code></pre>
<h3 id="gitlab"><a class="header" href="#gitlab">GitLab</a></h3>
<ol>
<li>Create a <a href="https://gitlab.com/profile/applications">new application</a>.</li>
<li>Add the <code>read_user</code> and <code>openid</code> scopes.</li>
<li>Add this Callback URL: <code>[synapse public baseurl]/_synapse/client/oidc/callback</code></li>
</ol>
<p>Synapse config:</p>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: gitlab
    idp_name: Gitlab
    idp_brand: &quot;gitlab&quot;  # optional: styling hint for clients
    issuer: &quot;https://gitlab.com/&quot;
    client_id: &quot;your-client-id&quot; # TO BE FILLED
    client_secret: &quot;your-client-secret&quot; # TO BE FILLED
    client_auth_method: &quot;client_secret_post&quot;
    scopes: [&quot;openid&quot;, &quot;read_user&quot;]
    user_profile_method: &quot;userinfo_endpoint&quot;
    user_mapping_provider:
      config:
        localpart_template: '{{ user.nickname }}'
        display_name_template: '{{ user.name }}'
</code></pre>
<h3 id="gitea"><a class="header" href="#gitea">Gitea</a></h3>
<p>Gitea is, like Github, not an OpenID provider, but just an OAuth2 provider.</p>
<p>The <a href="https://try.gitea.io/api/swagger#/user/userGetCurrent"><code>/user</code> API endpoint</a>
can be used to retrieve information on the authenticated user. As the Synapse
login mechanism needs an attribute to uniquely identify users, and that endpoint
does not return a <code>sub</code> property, an alternative <code>subject_claim</code> has to be set.</p>
<ol>
<li>Create a new application.</li>
<li>Add this Callback URL: <code>[synapse public baseurl]/_synapse/client/oidc/callback</code></li>
</ol>
<p>Synapse config:</p>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: gitea
    idp_name: Gitea
    discover: false
    issuer: &quot;https://your-gitea.com/&quot;
    client_id: &quot;your-client-id&quot; # TO BE FILLED
    client_secret: &quot;your-client-secret&quot; # TO BE FILLED
    client_auth_method: client_secret_post
    scopes: [] # Gitea doesn't support Scopes
    authorization_endpoint: &quot;https://your-gitea.com/login/oauth/authorize&quot;
    token_endpoint: &quot;https://your-gitea.com/login/oauth/access_token&quot;
    userinfo_endpoint: &quot;https://your-gitea.com/api/v1/user&quot;
    user_mapping_provider:
      config:
        subject_claim: &quot;id&quot;
        localpart_template: &quot;{{ user.login }}&quot;
        display_name_template: &quot;{{ user.full_name }}&quot;
</code></pre>
<h3 id="google"><a class="header" href="#google">Google</a></h3>
<p><a href="https://developers.google.com/identity/protocols/oauth2/openid-connect">Google</a> is an OpenID certified authentication and authorisation provider.</p>
<ol>
<li>Set up a project in the Google API Console (see 
<a href="https://developers.google.com/identity/protocols/oauth2/openid-connect#appsetup">documentation</a>).</li>
<li>Add an &quot;OAuth Client ID&quot; for a Web Application under &quot;Credentials&quot;.</li>
<li>Copy the Client ID and Client Secret, and add the following to your synapse config:
<pre><code class="language-yaml">oidc_providers:
  - idp_id: google
    idp_name: Google
    idp_brand: &quot;google&quot;  # optional: styling hint for clients
    issuer: &quot;https://accounts.google.com/&quot;
    client_id: &quot;your-client-id&quot; # TO BE FILLED
    client_secret: &quot;your-client-secret&quot; # TO BE FILLED
    scopes: [&quot;openid&quot;, &quot;profile&quot;, &quot;email&quot;] # email is optional, read below
    user_mapping_provider:
      config:
        localpart_template: &quot;{{ user.given_name|lower }}&quot;
        display_name_template: &quot;{{ user.name }}&quot;
        email_template: &quot;{{ user.email }}&quot; # needs &quot;email&quot; in scopes above
</code></pre>
</li>
<li>Back in the Google console, add this Authorized redirect URI: <code>[synapse public baseurl]/_synapse/client/oidc/callback</code>.</li>
</ol>
<h3 id="keycloak"><a class="header" href="#keycloak">Keycloak</a></h3>
<p><a href="https://www.keycloak.org/docs/latest/server_admin/#sso-protocols">Keycloak</a> is an opensource IdP maintained by Red Hat.</p>
<p>Keycloak supports OIDC Back-Channel Logout, which sends logout notification to Synapse, so that Synapse users get logged out when they log out from Keycloak.
This can be optionally enabled by setting <code>backchannel_logout_enabled</code> to <code>true</code> in the Synapse configuration, and by setting the &quot;Backchannel Logout URL&quot; in Keycloak.</p>
<p>Follow the <a href="https://www.keycloak.org/guides">Getting Started Guide</a> to install Keycloak and set up a realm.</p>
<ol>
<li>
<p>Click <code>Clients</code> in the sidebar and click <code>Create</code></p>
</li>
<li>
<p>Fill in the fields as below:</p>
</li>
</ol>
<table><thead><tr><th>Field</th><th>Value</th></tr></thead><tbody>
<tr><td>Client ID</td><td><code>synapse</code></td></tr>
<tr><td>Client Protocol</td><td><code>openid-connect</code></td></tr>
</tbody></table>
<ol start="3">
<li>Click <code>Save</code></li>
<li>Fill in the fields as below:</li>
</ol>
<table><thead><tr><th>Field</th><th>Value</th></tr></thead><tbody>
<tr><td>Client ID</td><td><code>synapse</code></td></tr>
<tr><td>Enabled</td><td><code>On</code></td></tr>
<tr><td>Client Protocol</td><td><code>openid-connect</code></td></tr>
<tr><td>Access Type</td><td><code>confidential</code></td></tr>
<tr><td>Valid Redirect URIs</td><td><code>[synapse public baseurl]/_synapse/client/oidc/callback</code></td></tr>
<tr><td>Backchannel Logout URL (optional)</td><td> <code>[synapse public baseurl]/_synapse/client/oidc/backchannel_logout</code></td></tr>
<tr><td>Backchannel Logout Session Required (optional)</td><td> <code>On</code></td></tr>
</tbody></table>
<ol start="5">
<li>Click <code>Save</code></li>
<li>On the Credentials tab, update the fields:</li>
</ol>
<table><thead><tr><th>Field</th><th>Value</th></tr></thead><tbody>
<tr><td>Client Authenticator</td><td><code>Client ID and Secret</code></td></tr>
</tbody></table>
<ol start="7">
<li>Click <code>Regenerate Secret</code></li>
<li>Copy Secret</li>
</ol>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: keycloak
    idp_name: &quot;My KeyCloak server&quot;
    issuer: &quot;https://127.0.0.1:8443/realms/{realm_name}&quot;
    client_id: &quot;synapse&quot;
    client_secret: &quot;copy secret generated from above&quot;
    scopes: [&quot;openid&quot;, &quot;profile&quot;]
    user_mapping_provider:
      config:
        localpart_template: &quot;{{ user.preferred_username }}&quot;
        display_name_template: &quot;{{ user.name }}&quot;
    backchannel_logout_enabled: true # Optional
</code></pre>
<h3 id="lemonldap"><a class="header" href="#lemonldap">LemonLDAP</a></h3>
<p><a href="https://lemonldap-ng.org/">LemonLDAP::NG</a> is an open-source IdP solution.</p>
<ol>
<li>Create an OpenID Connect Relying Parties in LemonLDAP::NG</li>
<li>The parameters are:</li>
</ol>
<ul>
<li>Client ID under the basic menu of the new Relying Parties (<code>Options &gt; Basic &gt; Client ID</code>)</li>
<li>Client secret (<code>Options &gt; Basic &gt; Client secret</code>)</li>
<li>JWT Algorithm: RS256 within the security menu of the new Relying Parties
(<code>Options &gt; Security &gt; ID Token signature algorithm</code> and <code>Options &gt; Security &gt; Access Token signature algorithm</code>)</li>
<li>Scopes: OpenID, Email and Profile</li>
<li>Allowed redirection addresses for login (<code>Options &gt; Basic &gt; Allowed redirection addresses for login</code> ) :
<code>[synapse public baseurl]/_synapse/client/oidc/callback</code></li>
</ul>
<p>Synapse config:</p>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: lemonldap
    idp_name: lemonldap
    discover: true
    issuer: &quot;https://auth.example.org/&quot; # TO BE FILLED: replace with your domain
    client_id: &quot;your client id&quot; # TO BE FILLED
    client_secret: &quot;your client secret&quot; # TO BE FILLED
    scopes:
      - &quot;openid&quot;
      - &quot;profile&quot;
      - &quot;email&quot;
    user_mapping_provider:
      config:
        localpart_template: &quot;{{ user.preferred_username }}}&quot;
        # TO BE FILLED: If your users have names in LemonLDAP::NG and you want those in Synapse, this should be replaced with user.name|capitalize or any valid filter.
        display_name_template: &quot;{{ user.preferred_username|capitalize }}&quot;
</code></pre>
<h3 id="mastodon"><a class="header" href="#mastodon">Mastodon</a></h3>
<p><a href="https://docs.joinmastodon.org/">Mastodon</a> instances provide an <a href="https://docs.joinmastodon.org/spec/oauth/">OAuth API</a>, allowing those instances to be used as a single sign-on provider for Synapse.</p>
<p>The first step is to register Synapse as an application with your Mastodon instance, using the <a href="https://docs.joinmastodon.org/methods/apps/#create">Create an application API</a> (see also <a href="https://docs.joinmastodon.org/client/token/">here</a>). There are several ways to do this, but in the example below we are using CURL.</p>
<p>This example assumes that:</p>
<ul>
<li>the Mastodon instance website URL is <code>https://your.mastodon.instance.url</code>, and</li>
<li>Synapse will be registered as an app named <code>my_synapse_app</code>.</li>
</ul>
<p>Send the following request, substituting the value of <code>synapse_public_baseurl</code> from your Synapse installation.</p>
<pre><code class="language-sh">curl -d &quot;client_name=my_synapse_app&amp;redirect_uris=https://[synapse_public_baseurl]/_synapse/client/oidc/callback&quot; -X POST https://your.mastodon.instance.url/api/v1/apps
</code></pre>
<p>You should receive a response similar to the following. Make sure to save it.</p>
<pre><code class="language-json">{&quot;client_id&quot;:&quot;someclientid_123&quot;,&quot;client_secret&quot;:&quot;someclientsecret_123&quot;,&quot;id&quot;:&quot;12345&quot;,&quot;name&quot;:&quot;my_synapse_app&quot;,&quot;redirect_uri&quot;:&quot;https://[synapse_public_baseurl]/_synapse/client/oidc/callback&quot;,&quot;website&quot;:null,&quot;vapid_key&quot;:&quot;somerandomvapidkey_123&quot;}
</code></pre>
<p>As the Synapse login mechanism needs an attribute to uniquely identify users, and Mastodon's endpoint does not return a <code>sub</code> property, an alternative <code>subject_template</code> has to be set. Your Synapse configuration should include the following:</p>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: my_mastodon
    idp_name: &quot;Mastodon Instance Example&quot;
    discover: false
    issuer: &quot;https://your.mastodon.instance.url/@admin&quot;
    client_id: &quot;someclientid_123&quot;    
    client_secret: &quot;someclientsecret_123&quot;
    authorization_endpoint: &quot;https://your.mastodon.instance.url/oauth/authorize&quot;
    token_endpoint: &quot;https://your.mastodon.instance.url/oauth/token&quot;
    userinfo_endpoint: &quot;https://your.mastodon.instance.url/api/v1/accounts/verify_credentials&quot;
    scopes: [&quot;read&quot;]
    user_mapping_provider:
      config:
        subject_template: &quot;{{ user.id }}&quot;
        localpart_template: &quot;{{ user.username }}&quot;
        display_name_template: &quot;{{ user.display_name }}&quot;
</code></pre>
<p>Note that the fields <code>client_id</code> and <code>client_secret</code> are taken from the CURL response above.</p>
<h3 id="shibboleth-with-oidc-plugin"><a class="header" href="#shibboleth-with-oidc-plugin">Shibboleth with OIDC Plugin</a></h3>
<p><a href="https://www.shibboleth.net/">Shibboleth</a> is an open Standard IdP solution widely used by Universities.</p>
<ol>
<li>Shibboleth needs the <a href="https://shibboleth.atlassian.net/wiki/spaces/IDPPLUGINS/pages/1376878976/OIDC+OP">OIDC Plugin</a> installed and working correctly.</li>
<li>Create a new config on the IdP Side, ensure that the <code>client_id</code> and <code>client_secret</code>
are randomly generated data.</li>
</ol>
<pre><code class="language-json">{
    &quot;client_id&quot;: &quot;SOME-CLIENT-ID&quot;,
    &quot;client_secret&quot;: &quot;SOME-SUPER-SECRET-SECRET&quot;,
    &quot;response_types&quot;: [&quot;code&quot;],
    &quot;grant_types&quot;: [&quot;authorization_code&quot;],
    &quot;scope&quot;: &quot;openid profile email&quot;,
    &quot;redirect_uris&quot;: [&quot;https://[synapse public baseurl]/_synapse/client/oidc/callback&quot;]
}
</code></pre>
<p>Synapse config:</p>
<pre><code class="language-yaml">oidc_providers:
  # Shibboleth IDP
  #
  - idp_id: shibboleth
    idp_name: &quot;Shibboleth Login&quot;
    discover: true
    issuer: &quot;https://YOUR-IDP-URL.TLD&quot;
    client_id: &quot;YOUR_CLIENT_ID&quot;
    client_secret: &quot;YOUR-CLIENT-SECRECT-FROM-YOUR-IDP&quot;
    scopes: [&quot;openid&quot;, &quot;profile&quot;, &quot;email&quot;]
    allow_existing_users: true
    user_profile_method: &quot;userinfo_endpoint&quot;
    user_mapping_provider:
      config:
        subject_claim: &quot;sub&quot;
        localpart_template: &quot;{{ user.sub.split('@')[0] }}&quot;
        display_name_template: &quot;{{ user.name }}&quot;
        email_template: &quot;{{ user.email }}&quot;
</code></pre>
<h3 id="twitch"><a class="header" href="#twitch">Twitch</a></h3>
<ol>
<li>Setup a developer account on <a href="https://dev.twitch.tv/">Twitch</a></li>
<li>Obtain the OAuth 2.0 credentials by <a href="https://dev.twitch.tv/console/apps/">creating an app</a></li>
<li>Add this OAuth Redirect URL: <code>[synapse public baseurl]/_synapse/client/oidc/callback</code></li>
</ol>
<p>Synapse config:</p>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: twitch
    idp_name: Twitch
    issuer: &quot;https://id.twitch.tv/oauth2/&quot;
    client_id: &quot;your-client-id&quot; # TO BE FILLED
    client_secret: &quot;your-client-secret&quot; # TO BE FILLED
    client_auth_method: &quot;client_secret_post&quot;
    user_mapping_provider:
      config:
        localpart_template: &quot;{{ user.preferred_username }}&quot;
        display_name_template: &quot;{{ user.name }}&quot;
</code></pre>
<h3 id="twitter"><a class="header" href="#twitter">Twitter</a></h3>
<p><em>Using Twitter as an identity provider requires using Synapse 1.75.0 or later.</em></p>
<ol>
<li>Setup a developer account on <a href="https://developer.twitter.com/en/portal/dashboard">Twitter</a></li>
<li>Create a project &amp; app.</li>
<li>Enable user authentication and under &quot;Type of App&quot; choose &quot;Web App, Automated App or Bot&quot;.</li>
<li>Under &quot;App info&quot; set the callback URL to <code>[synapse public baseurl]/_synapse/client/oidc/callback</code>.</li>
<li>Obtain the OAuth 2.0 credentials under the &quot;Keys and tokens&quot; tab, copy the &quot;OAuth 2.0 Client ID and Client Secret&quot;</li>
</ol>
<p>Synapse config:</p>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: twitter
    idp_name: Twitter
    idp_brand: &quot;twitter&quot;  # optional: styling hint for clients
    discover: false  # Twitter is not OpenID compliant.
    issuer: &quot;https://twitter.com/&quot;
    client_id: &quot;your-client-id&quot; # TO BE FILLED
    client_secret: &quot;your-client-secret&quot; # TO BE FILLED
    pkce_method: &quot;always&quot;
    # offline.access providers refresh tokens, tweet.read and users.read needed for userinfo request.
    scopes: [&quot;offline.access&quot;, &quot;tweet.read&quot;, &quot;users.read&quot;]
    authorization_endpoint: https://twitter.com/i/oauth2/authorize
    token_endpoint: https://api.twitter.com/2/oauth2/token
    userinfo_endpoint: https://api.twitter.com/2/users/me?user.fields=profile_image_url
    user_mapping_provider:
      config:
        subject_template: &quot;{{ user.data.id }}&quot;
        localpart_template: &quot;{{ user.data.username }}&quot;
        display_name_template: &quot;{{ user.data.name }}&quot;
        picture_template: &quot;{{ user.data.profile_image_url }}&quot;
</code></pre>
<h3 id="xwiki"><a class="header" href="#xwiki">XWiki</a></h3>
<p>Install <a href="https://extensions.xwiki.org/xwiki/bin/view/Extension/OpenID%20Connect/OpenID%20Connect%20Provider/">OpenID Connect Provider</a> extension in your <a href="https://www.xwiki.org">XWiki</a> instance.</p>
<p>Synapse config:</p>
<pre><code class="language-yaml">oidc_providers:
  - idp_id: xwiki
    idp_name: &quot;XWiki&quot;
    issuer: &quot;https://myxwikihost/xwiki/oidc/&quot;
    client_id: &quot;your-client-id&quot; # TO BE FILLED
    client_auth_method: none
    scopes: [&quot;openid&quot;, &quot;profile&quot;]
    user_profile_method: &quot;userinfo_endpoint&quot;
    user_mapping_provider:
      config:
        localpart_template: &quot;{{ user.preferred_username }}&quot;
        display_name_template: &quot;{{ user.name }}&quot;
</code></pre>

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