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Only check event IDs domain signed event for V1 and V2

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Since newer versions of events don't have the same format for event ID.
This commit is contained in:
Erik Johnston 2019-01-29 16:09:29 +00:00
parent b8d75ef53e
commit 770b823445
1 changed files with 14 additions and 5 deletions
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15
synapse/event_auth.py
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@ -20,7 +20,13 @@ from signedjson.key import decode_verify_key_bytes
from signedjson.sign import SignatureVerifyException, verify_signed_json
from unpaddedbase64 import decode_base64
from synapse.api.constants import KNOWN_ROOM_VERSIONS, EventTypes, JoinRules, Membership
from synapse.api.constants import (
KNOWN_ROOM_VERSIONS,
EventTypes,
JoinRules,
Membership,
RoomVersions,
)
from synapse.api.errors import AuthError, EventSizeError, SynapseError
from synapse.types import UserID, get_domain_from_id
@ -49,7 +55,6 @@ def check(room_version, event, auth_events, do_sig_check=True, do_size_check=Tru
if do_sig_check:
sender_domain = get_domain_from_id(event.sender)
event_id_domain = get_domain_from_id(event.event_id)
is_invite_via_3pid = (
event.type == EventTypes.Member
@ -66,7 +71,11 @@ def check(room_version, event, auth_events, do_sig_check=True, do_size_check=Tru
if not is_invite_via_3pid:
raise AuthError(403, "Event not signed by sender's server")
# Check the event_id's domain has signed the event
if event.format_version in (RoomVersions.V1, RoomVersions.V2):
# Only older room versions have event IDs to check.
event_id_domain = get_domain_from_id(event.event_id)
# Check the origin domain has signed the event
if not event.signatures.get(event_id_domain):
raise AuthError(403, "Event not signed by sending server")