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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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