diff options
Diffstat (limited to 'synapse/api/auth.py')
| -rw-r--r-- | synapse/api/auth.py | 168 |
1 files changed, 92 insertions, 76 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py index 88445fe999..3e891a6193 100644 --- a/synapse/api/auth.py +++ b/synapse/api/auth.py @@ -24,7 +24,6 @@ from synapse.api.constants import EventTypes, Membership, JoinRules from synapse.api.errors import AuthError, Codes, SynapseError, EventSizeError from synapse.types import RoomID, UserID, EventID from synapse.util.logutils import log_function -from synapse.util import third_party_invites from unpaddedbase64 import decode_base64 import logging @@ -49,6 +48,7 @@ class Auth(object): self.TOKEN_NOT_FOUND_HTTP_STATUS = 401 self._KNOWN_CAVEAT_PREFIXES = set([ "gen = ", + "guest = ", "type = ", "time < ", "user_id = ", @@ -183,15 +183,11 @@ class Auth(object): defer.returnValue(member) @defer.inlineCallbacks - def check_user_was_in_room(self, room_id, user_id, current_state=None): + def check_user_was_in_room(self, room_id, user_id): """Check if the user was in the room at some point. Args: room_id(str): The room to check. user_id(str): The user to check. - current_state(dict): Optional map of the current state of the room. - If provided then that map is used to check whether they are a - member of the room. Otherwise the current membership is - loaded from the database. Raises: AuthError if the user was never in the room. Returns: @@ -199,17 +195,11 @@ class Auth(object): room. This will be the join event if they are currently joined to the room. This will be the leave event if they have left the room. """ - if current_state: - member = current_state.get( - (EventTypes.Member, user_id), - None - ) - else: - member = yield self.state.get_current_state( - room_id=room_id, - event_type=EventTypes.Member, - state_key=user_id - ) + member = yield self.state.get_current_state( + room_id=room_id, + event_type=EventTypes.Member, + state_key=user_id + ) membership = member.membership if member else None if membership not in (Membership.JOIN, Membership.LEAVE): @@ -327,6 +317,11 @@ class Auth(object): } ) + if Membership.INVITE == membership and "third_party_invite" in event.content: + if not self._verify_third_party_invite(event, auth_events): + raise AuthError(403, "You are not invited to this room.") + return True + if Membership.JOIN != membership: if (caller_invited and Membership.LEAVE == membership @@ -370,8 +365,7 @@ class Auth(object): pass elif join_rule == JoinRules.INVITE: if not caller_in_room and not caller_invited: - if not self._verify_third_party_invite(event, auth_events): - raise AuthError(403, "You are not invited to this room.") + raise AuthError(403, "You are not invited to this room.") else: # TODO (erikj): may_join list # TODO (erikj): private rooms @@ -399,10 +393,10 @@ class Auth(object): def _verify_third_party_invite(self, event, auth_events): """ - Validates that the join event is authorized by a previous third-party invite. + Validates that the invite event is authorized by a previous third-party invite. - Checks that the public key, and keyserver, match those in the invite, - and that the join event has a signature issued using that public key. + Checks that the public key, and keyserver, match those in the third party invite, + and that the invite event has a signature issued using that public key. Args: event: The m.room.member join event being validated. @@ -413,35 +407,28 @@ class Auth(object): True if the event fulfills the expectations of a previous third party invite event. """ - if not third_party_invites.join_has_third_party_invite(event.content): + if "third_party_invite" not in event.content: return False - join_third_party_invite = event.content["third_party_invite"] - token = join_third_party_invite["token"] + if "signed" not in event.content["third_party_invite"]: + return False + signed = event.content["third_party_invite"]["signed"] + for key in {"mxid", "token"}: + if key not in signed: + return False + + token = signed["token"] + invite_event = auth_events.get( (EventTypes.ThirdPartyInvite, token,) ) if not invite_event: - logger.info("Failing 3pid invite because no invite found for token %s", token) + return False + + if event.user_id != invite_event.user_id: return False try: - public_key = join_third_party_invite["public_key"] - key_validity_url = join_third_party_invite["key_validity_url"] - if invite_event.content["public_key"] != public_key: - logger.info( - "Failing 3pid invite because public key invite: %s != join: %s", - invite_event.content["public_key"], - public_key - ) - return False - if invite_event.content["key_validity_url"] != key_validity_url: - logger.info( - "Failing 3pid invite because key_validity_url invite: %s != join: %s", - invite_event.content["key_validity_url"], - key_validity_url - ) - return False - signed = join_third_party_invite["signed"] - if signed["mxid"] != event.user_id: + public_key = invite_event.content["public_key"] + if signed["mxid"] != event.state_key: return False if signed["token"] != token: return False @@ -454,6 +441,11 @@ class Auth(object): decode_base64(public_key) ) verify_signed_json(signed, server, verify_key) + + # We got the public key from the invite, so we know that the + # correct server signed the signed bundle. + # The caller is responsible for checking that the signing + # server has not revoked that public key. return True return False except (KeyError, SignatureVerifyException,): @@ -497,7 +489,7 @@ class Auth(object): return default @defer.inlineCallbacks - def get_user_by_req(self, request): + def get_user_by_req(self, request, allow_guest=False): """ Get a registered user's ID. Args: @@ -535,7 +527,7 @@ class Auth(object): request.authenticated_entity = user_id - defer.returnValue((UserID.from_string(user_id), "")) + defer.returnValue((UserID.from_string(user_id), "", False)) return except KeyError: pass # normal users won't have the user_id query parameter set. @@ -543,6 +535,7 @@ class Auth(object): user_info = yield self._get_user_by_access_token(access_token) user = user_info["user"] token_id = user_info["token_id"] + is_guest = user_info["is_guest"] ip_addr = self.hs.get_ip_from_request(request) user_agent = request.requestHeaders.getRawHeaders( @@ -557,9 +550,14 @@ class Auth(object): user_agent=user_agent ) + if is_guest and not allow_guest: + raise AuthError( + 403, "Guest access not allowed", errcode=Codes.GUEST_ACCESS_FORBIDDEN + ) + request.authenticated_entity = user.to_string() - defer.returnValue((user, token_id,)) + defer.returnValue((user, token_id, is_guest,)) except KeyError: raise AuthError( self.TOKEN_NOT_FOUND_HTTP_STATUS, "Missing access token.", @@ -592,31 +590,45 @@ class Auth(object): self._validate_macaroon(macaroon) user_prefix = "user_id = " + user = None + guest = False for caveat in macaroon.caveats: if caveat.caveat_id.startswith(user_prefix): user = UserID.from_string(caveat.caveat_id[len(user_prefix):]) - # This codepath exists so that we can actually return a - # token ID, because we use token IDs in place of device - # identifiers throughout the codebase. - # TODO(daniel): Remove this fallback when device IDs are - # properly implemented. - ret = yield self._look_up_user_by_access_token(macaroon_str) - if ret["user"] != user: - logger.error( - "Macaroon user (%s) != DB user (%s)", - user, - ret["user"] - ) - raise AuthError( - self.TOKEN_NOT_FOUND_HTTP_STATUS, - "User mismatch in macaroon", - errcode=Codes.UNKNOWN_TOKEN - ) - defer.returnValue(ret) - raise AuthError( - self.TOKEN_NOT_FOUND_HTTP_STATUS, "No user caveat in macaroon", - errcode=Codes.UNKNOWN_TOKEN - ) + elif caveat.caveat_id == "guest = true": + guest = True + + if user is None: + raise AuthError( + self.TOKEN_NOT_FOUND_HTTP_STATUS, "No user caveat in macaroon", + errcode=Codes.UNKNOWN_TOKEN + ) + + if guest: + ret = { + "user": user, + "is_guest": True, + "token_id": None, + } + else: + # This codepath exists so that we can actually return a + # token ID, because we use token IDs in place of device + # identifiers throughout the codebase. + # TODO(daniel): Remove this fallback when device IDs are + # properly implemented. + ret = yield self._look_up_user_by_access_token(macaroon_str) + if ret["user"] != user: + logger.error( + "Macaroon user (%s) != DB user (%s)", + user, + ret["user"] + ) + raise AuthError( + self.TOKEN_NOT_FOUND_HTTP_STATUS, + "User mismatch in macaroon", + errcode=Codes.UNKNOWN_TOKEN + ) + defer.returnValue(ret) except (pymacaroons.exceptions.MacaroonException, TypeError, ValueError): raise AuthError( self.TOKEN_NOT_FOUND_HTTP_STATUS, "Invalid macaroon passed.", @@ -629,6 +641,7 @@ class Auth(object): v.satisfy_exact("type = access") v.satisfy_general(lambda c: c.startswith("user_id = ")) v.satisfy_general(self._verify_expiry) + v.satisfy_exact("guest = true") v.verify(macaroon, self.hs.config.macaroon_secret_key) v = pymacaroons.Verifier() @@ -666,6 +679,7 @@ class Auth(object): user_info = { "user": UserID.from_string(ret.get("name")), "token_id": ret.get("token_id", None), + "is_guest": False, } defer.returnValue(user_info) @@ -738,17 +752,19 @@ class Auth(object): if e_type == Membership.JOIN: if member_event and not is_public: auth_ids.append(member_event.event_id) - if third_party_invites.join_has_third_party_invite(event.content): + else: + if member_event: + auth_ids.append(member_event.event_id) + + if e_type == Membership.INVITE: + if "third_party_invite" in event.content: key = ( EventTypes.ThirdPartyInvite, event.content["third_party_invite"]["token"] ) - invite = current_state.get(key) - if invite: - auth_ids.append(invite.event_id) - else: - if member_event: - auth_ids.append(member_event.event_id) + third_party_invite = current_state.get(key) + if third_party_invite: + auth_ids.append(third_party_invite.event_id) elif member_event: if member_event.content["membership"] == Membership.JOIN: auth_ids.append(member_event.event_id) |