mirror of
https://mau.dev/maunium/synapse.git
synced 2024-10-01 01:36:05 -04:00
112 lines
3.8 KiB
Python
112 lines
3.8 KiB
Python
#
|
|
# This file is licensed under the Affero General Public License (AGPL) version 3.
|
|
#
|
|
# Copyright (C) 2023 New Vector, Ltd
|
|
#
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU Affero General Public License as
|
|
# published by the Free Software Foundation, either version 3 of the
|
|
# License, or (at your option) any later version.
|
|
#
|
|
# See the GNU Affero General Public License for more details:
|
|
# <https://www.gnu.org/licenses/agpl-3.0.html>.
|
|
#
|
|
# Originally licensed under the Apache License, Version 2.0:
|
|
# <http://www.apache.org/licenses/LICENSE-2.0>.
|
|
#
|
|
# [This file includes modifications made by New Vector Limited]
|
|
#
|
|
#
|
|
from typing import TYPE_CHECKING
|
|
|
|
from authlib.jose import JsonWebToken, JWTClaims
|
|
from authlib.jose.errors import BadSignatureError, InvalidClaimError, JoseError
|
|
|
|
from synapse.api.errors import Codes, LoginError
|
|
from synapse.types import JsonDict, UserID
|
|
|
|
if TYPE_CHECKING:
|
|
from synapse.server import HomeServer
|
|
|
|
|
|
class JwtHandler:
|
|
def __init__(self, hs: "HomeServer"):
|
|
self.hs = hs
|
|
|
|
self.jwt_secret = hs.config.jwt.jwt_secret
|
|
self.jwt_subject_claim = hs.config.jwt.jwt_subject_claim
|
|
self.jwt_algorithm = hs.config.jwt.jwt_algorithm
|
|
self.jwt_issuer = hs.config.jwt.jwt_issuer
|
|
self.jwt_audiences = hs.config.jwt.jwt_audiences
|
|
|
|
def validate_login(self, login_submission: JsonDict) -> str:
|
|
"""
|
|
Authenticates the user for the /login API
|
|
|
|
Args:
|
|
login_submission: the whole of the login submission
|
|
(including 'type' and other relevant fields)
|
|
|
|
Returns:
|
|
The user ID that is logging in.
|
|
|
|
Raises:
|
|
LoginError if there was an authentication problem.
|
|
"""
|
|
token = login_submission.get("token", None)
|
|
if token is None:
|
|
raise LoginError(
|
|
403, "Token field for JWT is missing", errcode=Codes.FORBIDDEN
|
|
)
|
|
|
|
jwt = JsonWebToken([self.jwt_algorithm])
|
|
claim_options = {}
|
|
if self.jwt_issuer is not None:
|
|
claim_options["iss"] = {"value": self.jwt_issuer, "essential": True}
|
|
if self.jwt_audiences is not None:
|
|
claim_options["aud"] = {"values": self.jwt_audiences, "essential": True}
|
|
|
|
try:
|
|
claims = jwt.decode(
|
|
token,
|
|
key=self.jwt_secret,
|
|
claims_cls=JWTClaims,
|
|
claims_options=claim_options,
|
|
)
|
|
except BadSignatureError:
|
|
# We handle this case separately to provide a better error message
|
|
raise LoginError(
|
|
403,
|
|
"JWT validation failed: Signature verification failed",
|
|
errcode=Codes.FORBIDDEN,
|
|
)
|
|
except JoseError as e:
|
|
# A JWT error occurred, return some info back to the client.
|
|
raise LoginError(
|
|
403,
|
|
"JWT validation failed: %s" % (str(e),),
|
|
errcode=Codes.FORBIDDEN,
|
|
)
|
|
|
|
try:
|
|
claims.validate(leeway=120) # allows 2 min of clock skew
|
|
|
|
# Enforce the old behavior which is rolled out in productive
|
|
# servers: if the JWT contains an 'aud' claim but none is
|
|
# configured, the login attempt will fail
|
|
if claims.get("aud") is not None:
|
|
if self.jwt_audiences is None or len(self.jwt_audiences) == 0:
|
|
raise InvalidClaimError("aud")
|
|
except JoseError as e:
|
|
raise LoginError(
|
|
403,
|
|
"JWT validation failed: %s" % (str(e),),
|
|
errcode=Codes.FORBIDDEN,
|
|
)
|
|
|
|
user = claims.get(self.jwt_subject_claim, None)
|
|
if user is None:
|
|
raise LoginError(403, "Invalid JWT", errcode=Codes.FORBIDDEN)
|
|
|
|
return UserID(user, self.hs.hostname).to_string()
|