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Merge pull request #2812 from hughrun/gts

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Fix federation with GoToSocial and inconsistent KeyId in headers
This commit is contained in:
Mouse Reeve 2023-05-29 19:54:00 -07:00 committed by GitHub
commit a4ccd45537
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 57 additions and 18 deletions
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20
bookwyrm/models/activitypub_mixin.py
View file

@ -529,7 +529,7 @@ async def async_broadcast(recipients: List[str], sender, data: str):
async def sign_and_send(
session: aiohttp.ClientSession, sender, data: str, destination: str
session: aiohttp.ClientSession, sender, data: str, destination: str, **kwargs
):
"""Sign the messages and send them in an asynchronous bundle"""
now = http_date()
@ -539,11 +539,19 @@ async def sign_and_send(
raise ValueError("No private key found for sender")
digest = make_digest(data)
signature = make_signature(
"post",
sender,
destination,
now,
digest=digest,
use_legacy_key=kwargs.get("use_legacy_key"),
)
headers = {
"Date": now,
"Digest": digest,
"Signature": make_signature("post", sender, destination, now, digest),
"Signature": signature,
"Content-Type": "application/activity+json; charset=utf-8",
"User-Agent": USER_AGENT,
}
@ -554,6 +562,14 @@ async def sign_and_send(
logger.exception(
"Failed to send broadcast to %s: %s", destination, response.reason
)
if kwargs.get("use_legacy_key") is not True:
logger.info("Trying again with legacy keyId header value")
asyncio.ensure_future(
sign_and_send(
session, sender, data, destination, use_legacy_key=True
)
)
return response
except asyncio.TimeoutError:
logger.info("Connection timed out for url: %s", destination)

9
bookwyrm/models/fields.py
View file

@ -371,7 +371,7 @@ class TagField(ManyToManyField):
tags.append(
activitypub.Link(
href=item.remote_id,
name=getattr(item, item.name_field),
name=f"@{getattr(item, item.name_field)}",
type=activity_type,
)
)
@ -379,7 +379,12 @@ class TagField(ManyToManyField):
def field_from_activity(self, value, allow_external_connections=True):
if not isinstance(value, list):
return None
# GoToSocial DMs and single-user mentions are
# sent as objects, not as an array of objects
if isinstance(value, dict):
value = [value]
else:
return None
items = []
for link_json in value:
link = activitypub.Link(**link_json)

11
bookwyrm/models/status.py
View file

@ -142,10 +142,17 @@ class Status(OrderedCollectionPageMixin, BookWyrmModel):
# keep notes if they mention local users
if activity.tag == MISSING or activity.tag is None:
return True
tags = [l["href"] for l in activity.tag if l["type"] == "Mention"]
# GoToSocial sends single tags as objects
# not wrapped in a list
tags = activity.tag if isinstance(activity.tag, list) else [activity.tag]
user_model = apps.get_model("bookwyrm.User", require_ready=True)
for tag in tags:
if user_model.objects.filter(remote_id=tag, local=True).exists():
if (
tag["type"] == "Mention"
and user_model.objects.filter(
remote_id=tag["href"], local=True
).exists()
):
# we found a mention of a known use boost
return False
return True

11
bookwyrm/signatures.py
View file

@ -22,7 +22,7 @@ def create_key_pair():
return private_key, public_key
def make_signature(method, sender, destination, date, digest=None):
def make_signature(method, sender, destination, date, **kwargs):
"""uses a private key to sign an outgoing message"""
inbox_parts = urlparse(destination)
signature_headers = [
@ -31,6 +31,7 @@ def make_signature(method, sender, destination, date, digest=None):
f"date: {date}",
]
headers = "(request-target) host date"
digest = kwargs.get("digest")
if digest is not None:
signature_headers.append(f"digest: {digest}")
headers = "(request-target) host date digest"
@ -38,8 +39,14 @@ def make_signature(method, sender, destination, date, digest=None):
message_to_sign = "\n".join(signature_headers)
signer = pkcs1_15.new(RSA.import_key(sender.key_pair.private_key))
signed_message = signer.sign(SHA256.new(message_to_sign.encode("utf8")))
# For legacy reasons we need to use an incorrect keyId for older Bookwyrm versions
key_id = (
f"{sender.remote_id}#main-key"
if kwargs.get("use_legacy_key")
else f"{sender.remote_id}/#main-key"
)
signature = {
"keyId": f"{sender.remote_id}#main-key",
"keyId": key_id,
"algorithm": "rsa-sha256",
"headers": headers,
"signature": b64encode(signed_message).decode("utf8"),

2
bookwyrm/tests/models/test_fields.py
View file

@ -404,7 +404,7 @@ class ModelFields(TestCase):
self.assertIsInstance(result, list)
self.assertEqual(len(result), 1)
self.assertEqual(result[0].href, "https://e.b/c")
self.assertEqual(result[0].name, "Name")
self.assertEqual(result[0].name, "@Name")
self.assertEqual(result[0].type, "Serializable")
def test_tag_field_from_activity(self, *_):

6
bookwyrm/tests/test_signing.py
View file

@ -87,7 +87,7 @@ class Signature(TestCase):
data = json.dumps(get_follow_activity(sender, self.rat))
digest = digest or make_digest(data)
signature = make_signature(
"post", signer or sender, self.rat.inbox, now, digest
"post", signer or sender, self.rat.inbox, now, digest=digest
)
with patch("bookwyrm.views.inbox.activity_task.apply_async"):
with patch("bookwyrm.models.user.set_remote_server.delay"):
@ -111,6 +111,7 @@ class Signature(TestCase):
datafile = pathlib.Path(__file__).parent.joinpath("data/ap_user.json")
data = json.loads(datafile.read_bytes())
data["id"] = self.fake_remote.remote_id
data["publicKey"]["id"] = f"{self.fake_remote.remote_id}/#main-key"
data["publicKey"]["publicKeyPem"] = self.fake_remote.key_pair.public_key
del data["icon"] # Avoid having to return an avatar.
responses.add(responses.GET, self.fake_remote.remote_id, json=data, status=200)
@ -138,6 +139,7 @@ class Signature(TestCase):
datafile = pathlib.Path(__file__).parent.joinpath("data/ap_user.json")
data = json.loads(datafile.read_bytes())
data["id"] = self.fake_remote.remote_id
data["publicKey"]["id"] = f"{self.fake_remote.remote_id}/#main-key"
data["publicKey"]["publicKeyPem"] = self.fake_remote.key_pair.public_key
del data["icon"] # Avoid having to return an avatar.
responses.add(responses.GET, self.fake_remote.remote_id, json=data, status=200)
@ -157,7 +159,7 @@ class Signature(TestCase):
"bookwyrm.models.relationship.UserFollowRequest.accept"
) as accept_mock:
response = self.send_test_request(sender=self.fake_remote)
self.assertEqual(response.status_code, 200)
self.assertEqual(response.status_code, 200) # BUG this is 401
self.assertTrue(accept_mock.called)
# Old key is cached, so still works:

16
bookwyrm/views/inbox.py
View file

@ -3,7 +3,6 @@ import json
import re
import logging
from urllib.parse import urldefrag
import requests
from django.http import HttpResponse, Http404
@ -130,15 +129,18 @@ def has_valid_signature(request, activity):
"""verify incoming signature"""
try:
signature = Signature.parse(request)
key_actor = urldefrag(signature.key_id).url
if key_actor != activity.get("actor"):
raise ValueError("Wrong actor created signature.")
remote_user = activitypub.resolve_remote_id(key_actor, model=models.User)
remote_user = activitypub.resolve_remote_id(
activity.get("actor"), model=models.User
)
if not remote_user:
return False
if signature.key_id != remote_user.key_pair.remote_id:
if (
signature.key_id != f"{remote_user.remote_id}#main-key"
): # legacy Bookwyrm
raise ValueError("Wrong actor created signature.")
try:
signature.verify(remote_user.key_pair.public_key, request)
except ValueError: