106 lines
3.8 KiB
Python
106 lines
3.8 KiB
Python
# Copyright 2023 Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from typing import TYPE_CHECKING
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from authlib.jose import JsonWebToken, JWTClaims
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from authlib.jose.errors import BadSignatureError, InvalidClaimError, JoseError
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from synapse.api.errors import Codes, LoginError
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from synapse.types import JsonDict, UserID
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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class JwtHandler:
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def __init__(self, hs: "HomeServer"):
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self.hs = hs
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self.jwt_secret = hs.config.jwt.jwt_secret
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self.jwt_subject_claim = hs.config.jwt.jwt_subject_claim
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self.jwt_algorithm = hs.config.jwt.jwt_algorithm
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self.jwt_issuer = hs.config.jwt.jwt_issuer
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self.jwt_audiences = hs.config.jwt.jwt_audiences
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def validate_login(self, login_submission: JsonDict) -> str:
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"""
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Authenticates the user for the /login API
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Args:
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login_submission: the whole of the login submission
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(including 'type' and other relevant fields)
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Returns:
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The user ID that is logging in.
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Raises:
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LoginError if there was an authentication problem.
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"""
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token = login_submission.get("token", None)
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if token is None:
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raise LoginError(
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403, "Token field for JWT is missing", errcode=Codes.FORBIDDEN
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)
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jwt = JsonWebToken([self.jwt_algorithm])
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claim_options = {}
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if self.jwt_issuer is not None:
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claim_options["iss"] = {"value": self.jwt_issuer, "essential": True}
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if self.jwt_audiences is not None:
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claim_options["aud"] = {"values": self.jwt_audiences, "essential": True}
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try:
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claims = jwt.decode(
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token,
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key=self.jwt_secret,
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claims_cls=JWTClaims,
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claims_options=claim_options,
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)
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except BadSignatureError:
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# We handle this case separately to provide a better error message
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raise LoginError(
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403,
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"JWT validation failed: Signature verification failed",
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errcode=Codes.FORBIDDEN,
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)
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except JoseError as e:
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# A JWT error occurred, return some info back to the client.
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raise LoginError(
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403,
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"JWT validation failed: %s" % (str(e),),
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errcode=Codes.FORBIDDEN,
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)
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try:
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claims.validate(leeway=120) # allows 2 min of clock skew
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# Enforce the old behavior which is rolled out in productive
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# servers: if the JWT contains an 'aud' claim but none is
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# configured, the login attempt will fail
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if claims.get("aud") is not None:
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if self.jwt_audiences is None or len(self.jwt_audiences) == 0:
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raise InvalidClaimError("aud")
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except JoseError as e:
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raise LoginError(
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403,
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"JWT validation failed: %s" % (str(e),),
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errcode=Codes.FORBIDDEN,
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)
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user = claims.get(self.jwt_subject_claim, None)
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if user is None:
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raise LoginError(403, "Invalid JWT", errcode=Codes.FORBIDDEN)
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return UserID(user, self.hs.hostname).to_string()
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