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- <h1 id="jwt-login-type"><a class="header" href="#jwt-login-type">JWT Login Type</a></h1>
- <p>Synapse comes with a non-standard login type to support
- <a href="https://en.wikipedia.org/wiki/JSON_Web_Token">JSON Web Tokens</a>. In general the
- documentation for
- <a href="https://matrix.org/docs/spec/client_server/r0.6.1#login">the login endpoint</a>
- is still valid (and the mechanism works similarly to the
- <a href="https://matrix.org/docs/spec/client_server/r0.6.1#token-based">token based login</a>).</p>
- <p>To log in using a JSON Web Token, clients should submit a <code>/login</code> request as
- follows:</p>
- <pre><code class="language-json">{
- "type": "org.matrix.login.jwt",
- "token": "<jwt>"
- }
- </code></pre>
- <p>The <code>token</code> field should include the JSON web token with the following claims:</p>
- <ul>
- <li>A claim that encodes the local part of the user ID is required. By default,
- the <code>sub</code> (subject) claim is used, or a custom claim can be set in the
- configuration file.</li>
- <li>The expiration time (<code>exp</code>), not before time (<code>nbf</code>), and issued at (<code>iat</code>)
- claims are optional, but validated if present.</li>
- <li>The issuer (<code>iss</code>) claim is optional, but required and validated if configured.</li>
- <li>The audience (<code>aud</code>) claim is optional, but required and validated if configured.
- Providing the audience claim when not configured will cause validation to fail.</li>
- </ul>
- <p>In the case that the token is not valid, the homeserver must respond with
- <code>403 Forbidden</code> and an error code of <code>M_FORBIDDEN</code>.</p>
- <p>As with other login types, there are additional fields (e.g. <code>device_id</code> and
- <code>initial_device_display_name</code>) which can be included in the above request.</p>
- <h2 id="preparing-synapse"><a class="header" href="#preparing-synapse">Preparing Synapse</a></h2>
- <p>The JSON Web Token integration in Synapse uses the
- <a href="https://docs.authlib.org/en/latest/index.html"><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 synapse[jwt]</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 JSON web token integration, you should then add a <code>jwt_config</code> option
- to your configuration file. See the <a href="usage/configuration/config_documentation.html#jwt_config">configuration manual</a> for some
- sample settings.</p>
- <h2 id="how-to-test-jwt-as-a-developer"><a class="header" href="#how-to-test-jwt-as-a-developer">How to test JWT as a developer</a></h2>
- <p>Although JSON Web Tokens are typically generated from an external server, the
- example below uses a locally generated JWT.</p>
- <ol>
- <li>
- <p>Configure Synapse with JWT logins, note that this example uses a pre-shared
- secret and an algorithm of HS256:</p>
- <pre><code class="language-yaml">jwt_config:
- enabled: true
- secret: "my-secret-token"
- algorithm: "HS256"
- </code></pre>
- </li>
- <li>
- <p>Generate a JSON web token:</p>
- <p>You can use the following short Python snippet to generate a JWT
- protected by an HMAC.
- Take care that the <code>secret</code> and the algorithm given in the <code>header</code> match
- the entries from <code>jwt_config</code> above.</p>
- <pre><code class="language-python">from authlib.jose import jwt
- header = {"alg": "HS256"}
- payload = {"sub": "user1", "aud": ["audience"]}
- secret = "my-secret-token"
- result = jwt.encode(header, payload, secret)
- print(result.decode("ascii"))
- </code></pre>
- </li>
- <li>
- <p>Query for the login types and ensure <code>org.matrix.login.jwt</code> is there:</p>
- <pre><code class="language-bash">curl http://localhost:8080/_matrix/client/r0/login
- </code></pre>
- </li>
- <li>
- <p>Login used the generated JSON web token from above:</p>
- <pre><code class="language-bash">$ curl http://localhost:8082/_matrix/client/r0/login -X POST \
- --data '{"type":"org.matrix.login.jwt","token":"eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ0ZXN0LXVzZXIifQ.Ag71GT8v01UO3w80aqRPTeuVPBIBZkYhNTJJ-_-zQIc"}'
- {
- "access_token": "<access token>",
- "device_id": "ACBDEFGHI",
- "home_server": "localhost:8080",
- "user_id": "@test-user:localhost:8480"
- }
- </code></pre>
- </li>
- </ol>
- <p>You should now be able to use the returned access token to query the client API.</p>
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