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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 (or uncomment one of the existing examples).
See <a href="./sample_config.yaml">sample_config.yaml</a> for some sample settings, as well as
the text below for example configurations for specific providers.</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="dex"><a class="header" href="#dex"><a href="https://github.com/dexidp/dex">Dex</a></a></h3>
<p><a href="https://github.com/dexidp/dex">Dex</a> is a simple, open-source, certified 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="keycloak"><a class="header" href="#keycloak"><a href="https://www.keycloak.org/docs/latest/server_admin/#sso-protocols">Keycloak</a></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>Follow the <a href="https://www.keycloak.org/getting-started">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>
</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/auth/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;
</code></pre>
<h3 id="auth0"><a class="header" href="#auth0"><a href="https://auth0.com/">Auth0</a></a></h3>
<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 to add the <code>preferred_username</code> claim.</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="github"><a class="header" href="#github">GitHub</a></h3>
<p>GitHub 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: https://github.com/settings/applications/new.</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="google"><a class="header" href="#google"><a href="https://developers.google.com/identity/protocols/oauth2/openid-connect">Google</a></a></h3>
<ol>
<li>Set up a project in the Google API Console (see
https://developers.google.com/identity/protocols/oauth2/openid-connect#appsetup).</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;]
    user_mapping_provider:
      config:
        localpart_template: &quot;{{ user.given_name|lower }}&quot;
        display_name_template: &quot;{{ user.name }}&quot;
</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="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="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="facebook"><a class="header" href="#facebook">Facebook</a></h3>
<p>Like Github, Facebook provide a custom OAuth2 API rather than an OIDC-compliant
one so requires a little more configuration.</p>
<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://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: https://facebook.com/dialog/oauth
    token_endpoint: https://graph.facebook.com/v9.0/oauth/access_token
    user_profile_method: &quot;userinfo_endpoint&quot;
    userinfo_endpoint: &quot;https://graph.facebook.com/v9.0/me?fields=id,name,email,picture&quot;
    user_mapping_provider:
      config:
        subject_claim: &quot;id&quot;
        display_name_template: &quot;{{ user.name }}&quot;
</code></pre>
<p>Relevant documents:</p>
<ul>
<li>https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow</li>
<li>Using Facebook's Graph API: https://developers.facebook.com/docs/graph-api/using-graph-api/</li>
<li>Reference to the User endpoint: https://developers.facebook.com/docs/graph-api/reference/user</li>
</ul>
<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="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>
<h2 id="apple"><a class="header" href="#apple">Apple</a></h2>
<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>https://help.apple.com/developer-account/?lang=en#/dev77c875b7e has more
documentation 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>

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