diff options
| -rw-r--r-- | changelog.d/7776.doc | 1 | ||||
| -rw-r--r-- | docs/jwt.md | 90 | ||||
| -rw-r--r-- | docs/sample_config.yaml | 35 | ||||
| -rw-r--r-- | synapse/config/jwt_config.py | 35 | ||||
| -rw-r--r-- | synapse/rest/client/v1/login.py | 48 |
5 files changed, 180 insertions, 29 deletions
diff --git a/changelog.d/7776.doc b/changelog.d/7776.doc new file mode 100644 index 0000000000..e686215688 --- /dev/null +++ b/changelog.d/7776.doc @@ -0,0 +1 @@ +Improve the documentation of the non-standard JSON web token login type. diff --git a/docs/jwt.md b/docs/jwt.md new file mode 100644 index 0000000000..289d66b365 --- /dev/null +++ b/docs/jwt.md @@ -0,0 +1,90 @@ +# JWT Login Type + +Synapse comes with a non-standard login type to support +[JSON Web Tokens](https://en.wikipedia.org/wiki/JSON_Web_Token). In general the +documentation for +[the login endpoint](https://matrix.org/docs/spec/client_server/r0.6.1#login) +is still valid (and the mechanism works similarly to the +[token based login](https://matrix.org/docs/spec/client_server/r0.6.1#token-based)). + +To log in using a JSON Web Token, clients should submit a `/login` request as +follows: + +```json +{ + "type": "org.matrix.login.jwt", + "token": "<jwt>" +} +``` + +Note that the login type of `m.login.jwt` is supported, but is deprecated. This +will be removed in a future version of Synapse. + +The `jwt` should encode the local part of the user ID as the standard `sub` +claim. In the case that the token is not valid, the homeserver must respond with +`401 Unauthorized` and an error code of `M_UNAUTHORIZED`. + +(Note that this differs from the token based logins which return a +`403 Forbidden` and an error code of `M_FORBIDDEN` if an error occurs.) + +As with other login types, there are additional fields (e.g. `device_id` and +`initial_device_display_name`) which can be included in the above request. + +## Preparing Synapse + +The JSON Web Token integration in Synapse uses the +[`PyJWT`](https://pypi.org/project/pyjwt/) library, which must be installed +as follows: + + * The relevant libraries are included in the Docker images and Debian packages + provided by `matrix.org` so no further action is needed. + + * If you installed Synapse into a virtualenv, run `/path/to/env/bin/pip + install synapse[pyjwt]` to install the necessary dependencies. + + * For other installation mechanisms, see the documentation provided by the + maintainer. + +To enable the JSON web token integration, you should then add an `jwt_config` section +to your configuration file (or uncomment the `enabled: true` line in the +existing section). See [sample_config.yaml](./sample_config.yaml) for some +sample settings. + +## How to test JWT as a developer + +Although JSON Web Tokens are typically generated from an external server, the +examples below use [PyJWT](https://pyjwt.readthedocs.io/en/latest/) directly. + +1. Configure Synapse with JWT logins: + + ```yaml + jwt_config: + enabled: true + secret: "my-secret-token" + algorithm: "HS256" + ``` +2. Generate a JSON web token: + + ```bash + $ pyjwt --key=my-secret-token --alg=HS256 encode sub=test-user + eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ0ZXN0LXVzZXIifQ.Ag71GT8v01UO3w80aqRPTeuVPBIBZkYhNTJJ-_-zQIc + ``` +3. Query for the login types and ensure `org.matrix.login.jwt` is there: + + ```bash + curl http://localhost:8080/_matrix/client/r0/login + ``` +4. Login used the generated JSON web token from above: + + ```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" + } + ``` + +You should now be able to use the returned access token to query the client API. diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml index 2d27b0b34d..164a104045 100644 --- a/docs/sample_config.yaml +++ b/docs/sample_config.yaml @@ -1804,12 +1804,39 @@ sso: #template_dir: "res/templates" -# The JWT needs to contain a globally unique "sub" (subject) claim. +# JSON web token integration. The following settings can be used to make +# Synapse JSON web tokens for authentication, instead of its internal +# password database. +# +# Each JSON Web Token needs to contain a "sub" (subject) claim, which is +# used as the localpart of the mxid. +# +# Note that this is a non-standard login type and client support is +# expected to be non-existant. +# +# See https://github.com/matrix-org/synapse/blob/master/docs/jwt.md. # #jwt_config: -# enabled: true -# secret: "a secret" -# algorithm: "HS256" + # Uncomment the following to enable authorization using JSON web + # tokens. Defaults to false. + # + #enabled: true + + # This is either the private shared secret or the public key used to + # decode the contents of the JSON web token. + # + # Required if 'enabled' is true. + # + #secret: "provided-by-your-issuer" + + # The algorithm used to sign the JSON web token. + # + # Supported algorithms are listed at + # https://pyjwt.readthedocs.io/en/latest/algorithms.html + # + # Required if 'enabled' is true. + # + #algorithm: "provided-by-your-issuer" password_config: diff --git a/synapse/config/jwt_config.py b/synapse/config/jwt_config.py index a568726985..fce96b4acf 100644 --- a/synapse/config/jwt_config.py +++ b/synapse/config/jwt_config.py @@ -45,10 +45,37 @@ class JWTConfig(Config): def generate_config_section(self, **kwargs): return """\ - # The JWT needs to contain a globally unique "sub" (subject) claim. + # JSON web token integration. The following settings can be used to make + # Synapse JSON web tokens for authentication, instead of its internal + # password database. + # + # Each JSON Web Token needs to contain a "sub" (subject) claim, which is + # used as the localpart of the mxid. + # + # Note that this is a non-standard login type and client support is + # expected to be non-existant. + # + # See https://github.com/matrix-org/synapse/blob/master/docs/jwt.md. # #jwt_config: - # enabled: true - # secret: "a secret" - # algorithm: "HS256" + # Uncomment the following to enable authorization using JSON web + # tokens. Defaults to false. + # + #enabled: true + + # This is either the private shared secret or the public key used to + # decode the contents of the JSON web token. + # + # Required if 'enabled' is true. + # + #secret: "provided-by-your-issuer" + + # The algorithm used to sign the JSON web token. + # + # Supported algorithms are listed at + # https://pyjwt.readthedocs.io/en/latest/algorithms.html + # + # Required if 'enabled' is true. + # + #algorithm: "provided-by-your-issuer" """ diff --git a/synapse/rest/client/v1/login.py b/synapse/rest/client/v1/login.py index f6eef7afee..64d5c58b65 100644 --- a/synapse/rest/client/v1/login.py +++ b/synapse/rest/client/v1/login.py @@ -14,6 +14,7 @@ # limitations under the License. import logging +from typing import Awaitable, Callable, Dict, Optional from synapse.api.errors import Codes, LoginError, SynapseError from synapse.api.ratelimiting import Ratelimiter @@ -26,7 +27,7 @@ from synapse.http.servlet import ( from synapse.http.site import SynapseRequest from synapse.rest.client.v2_alpha._base import client_patterns from synapse.rest.well_known import WellKnownBuilder -from synapse.types import UserID +from synapse.types import JsonDict, UserID from synapse.util.msisdn import phone_number_to_msisdn from synapse.util.threepids import canonicalise_email @@ -114,7 +115,7 @@ class LoginRestServlet(RestServlet): burst_count=self.hs.config.rc_login_failed_attempts.burst_count, ) - def on_GET(self, request): + def on_GET(self, request: SynapseRequest): flows = [] if self.jwt_enabled: flows.append({"type": LoginRestServlet.JWT_TYPE}) @@ -142,10 +143,10 @@ class LoginRestServlet(RestServlet): return 200, {"flows": flows} - def on_OPTIONS(self, request): + def on_OPTIONS(self, request: SynapseRequest): return 200, {} - async def on_POST(self, request): + async def on_POST(self, request: SynapseRequest): self._address_ratelimiter.ratelimit(request.getClientIP()) login_submission = parse_json_object_from_request(request) @@ -154,9 +155,9 @@ class LoginRestServlet(RestServlet): login_submission["type"] == LoginRestServlet.JWT_TYPE or login_submission["type"] == LoginRestServlet.JWT_TYPE_DEPRECATED ): - result = await self.do_jwt_login(login_submission) + result = await self._do_jwt_login(login_submission) elif login_submission["type"] == LoginRestServlet.TOKEN_TYPE: - result = await self.do_token_login(login_submission) + result = await self._do_token_login(login_submission) else: result = await self._do_other_login(login_submission) except KeyError: @@ -167,14 +168,14 @@ class LoginRestServlet(RestServlet): result["well_known"] = well_known_data return 200, result - async def _do_other_login(self, login_submission): + async def _do_other_login(self, login_submission: JsonDict) -> Dict[str, str]: """Handle non-token/saml/jwt logins Args: login_submission: Returns: - dict: HTTP response + HTTP response """ # Log the request we got, but only certain fields to minimise the chance of # logging someone's password (even if they accidentally put it in the wrong @@ -292,25 +293,30 @@ class LoginRestServlet(RestServlet): return result async def _complete_login( - self, user_id, login_submission, callback=None, create_non_existent_users=False - ): + self, + user_id: str, + login_submission: JsonDict, + callback: Optional[ + Callable[[Dict[str, str]], Awaitable[Dict[str, str]]] + ] = None, + create_non_existent_users: bool = False, + ) -> Dict[str, str]: """Called when we've successfully authed the user and now need to actually login them in (e.g. create devices). This gets called on - all succesful logins. + all successful logins. - Applies the ratelimiting for succesful login attempts against an + Applies the ratelimiting for successful login attempts against an account. Args: - user_id (str): ID of the user to register. - login_submission (dict): Dictionary of login information. - callback (func|None): Callback function to run after registration. - create_non_existent_users (bool): Whether to create the user if - they don't exist. Defaults to False. + user_id: ID of the user to register. + login_submission: Dictionary of login information. + callback: Callback function to run after registration. + create_non_existent_users: Whether to create the user if they don't + exist. Defaults to False. Returns: - result (Dict[str,str]): Dictionary of account information after - successful registration. + result: Dictionary of account information after successful registration. """ # Before we actually log them in we check if they've already logged in @@ -344,7 +350,7 @@ class LoginRestServlet(RestServlet): return result - async def do_token_login(self, login_submission): + async def _do_token_login(self, login_submission: JsonDict) -> Dict[str, str]: token = login_submission["token"] auth_handler = self.auth_handler user_id = await auth_handler.validate_short_term_login_token_and_get_user_id( @@ -354,7 +360,7 @@ class LoginRestServlet(RestServlet): result = await self._complete_login(user_id, login_submission) return result - async def do_jwt_login(self, login_submission): + async def _do_jwt_login(self, login_submission: JsonDict) -> Dict[str, str]: token = login_submission.get("token", None) if token is None: raise LoginError( |