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Synapse 1.15.2 (2020-07-02)

Browse Source 
===========================
 
 Due to the two security issues highlighted below, server administrators are
 encouraged to update Synapse. We are not aware of these vulnerabilities being
 exploited in the wild.
 
 Security advisory
 -----------------
 
 * A malicious homeserver could force Synapse to reset the state in a room to a
   small subset of the correct state. This affects all Synapse deployments which
   federate with untrusted servers. ([96e9afe6](96e9afe625))
 * HTML pages served via Synapse were vulnerable to clickjacking attacks. This
   predominantly affects homeservers with single-sign-on enabled, but all server
   administrators are encouraged to upgrade. ([ea26e9a9](ea26e9a98b))
 
   This was reported by [Quentin Gliech](https://sandhose.fr/).
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Merge tag 'v1.15.2'

Synapse 1.15.2 (2020-07-02)
===========================

Due to the two security issues highlighted below, server administrators are
encouraged to update Synapse. We are not aware of these vulnerabilities being
exploited in the wild.

Security advisory
-----------------

* A malicious homeserver could force Synapse to reset the state in a room to a
  small subset of the correct state. This affects all Synapse deployments which
  federate with untrusted servers. ([96e9afe6](96e9afe625))
* HTML pages served via Synapse were vulnerable to clickjacking attacks. This
  predominantly affects homeservers with single-sign-on enabled, but all server
  administrators are encouraged to upgrade. ([ea26e9a9](ea26e9a98b))

  This was reported by [Quentin Gliech](https://sandhose.fr/).
This commit is contained in:
Patrick Cloke 2020-07-02 10:54:29 -04:00
commit fedb632d0a
14 changed files with 133 additions and 98 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
CHANGES.md
View File

@ -1,3 +1,23 @@
Synapse 1.15.2 (2020-07-02)
===========================
Due to the two security issues highlighted below, server administrators are
encouraged to update Synapse. We are not aware of these vulnerabilities being
exploited in the wild.
Security advisory
-----------------
* A malicious homeserver could force Synapse to reset the state in a room to a
small subset of the correct state. This affects all Synapse deployments which
federate with untrusted servers. ([96e9afe6](https://github.com/matrix-org/synapse/commit/96e9afe62500310977dc3cbc99a8d16d3d2fa15c))
* HTML pages served via Synapse were vulnerable to clickjacking attacks. This
predominantly affects homeservers with single-sign-on enabled, but all server
administrators are encouraged to upgrade. ([ea26e9a9](https://github.com/matrix-org/synapse/commit/ea26e9a98b0541fc886a1cb826a38352b7599dbe))
This was reported by [Quentin Gliech](https://sandhose.fr/).
Synapse 1.15.1 (2020-06-16)
===========================

6
debian/changelog vendored
View File

@ -1,3 +1,9 @@
matrix-synapse-py3 (1.15.2) stable; urgency=medium
* New synapse release 1.15.2.
-- Synapse Packaging team <packages@matrix.org> Thu, 02 Jul 2020 10:34:00 -0400
matrix-synapse-py3 (1.15.1) stable; urgency=medium
* New synapse release 1.15.1.

2
synapse/__init__.py
View File

@ -36,7 +36,7 @@ try:
except ImportError:
pass
__version__ = "1.15.1"
__version__ = "1.15.2"
if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)):
# We import here so that we don't have to install a bunch of deps when

3
synapse/app/homeserver.py
View File

@ -56,6 +56,7 @@ from synapse.http.server import (
OptionsResource,
RootOptionsRedirectResource,
RootRedirect,
StaticResource,
)
from synapse.http.site import SynapseSite
from synapse.logging.context import LoggingContext
@ -228,7 +229,7 @@ class SynapseHomeServer(HomeServer):
if name in ["static", "client"]:
resources.update(
{
STATIC_PREFIX: File(
STATIC_PREFIX: StaticResource(
os.path.join(os.path.dirname(synapse.__file__), "static")
)
}

30
synapse/handlers/auth.py
View File

@ -38,7 +38,7 @@ from synapse.api.errors import (
from synapse.api.ratelimiting import Ratelimiter
from synapse.handlers.ui_auth import INTERACTIVE_AUTH_CHECKERS
from synapse.handlers.ui_auth.checkers import UserInteractiveAuthChecker
from synapse.http.server import finish_request
from synapse.http.server import finish_request, respond_with_html
from synapse.http.site import SynapseRequest
from synapse.logging.context import defer_to_thread
from synapse.metrics.background_process_metrics import run_as_background_process
@ -1055,13 +1055,8 @@ class AuthHandler(BaseHandler):
)
# Render the HTML and return.
html_bytes = self._sso_auth_success_template.encode("utf-8")
request.setResponseCode(200)
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(b"Content-Length", b"%d" % (len(html_bytes),))
request.write(html_bytes)
finish_request(request)
html = self._sso_auth_success_template
respond_with_html(request, 200, html)
async def complete_sso_login(
self,
@ -1081,13 +1076,7 @@ class AuthHandler(BaseHandler):
# flow.
deactivated = await self.store.get_user_deactivated_status(registered_user_id)
if deactivated:
html_bytes = self._sso_account_deactivated_template.encode("utf-8")
request.setResponseCode(403)
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(b"Content-Length", b"%d" % (len(html_bytes),))
request.write(html_bytes)
finish_request(request)
respond_with_html(request, 403, self._sso_account_deactivated_template)
return
self._complete_sso_login(registered_user_id, request, client_redirect_url)
@ -1128,17 +1117,12 @@ class AuthHandler(BaseHandler):
# URL we redirect users to.
redirect_url_no_params = client_redirect_url.split("?")[0]
html_bytes = self._sso_redirect_confirm_template.render(
html = self._sso_redirect_confirm_template.render(
display_url=redirect_url_no_params,
redirect_url=redirect_url,
server_name=self._server_name,
).encode("utf-8")
request.setResponseCode(200)
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(b"Content-Length", b"%d" % (len(html_bytes),))
request.write(html_bytes)
finish_request(request)
)
respond_with_html(request, 200, html)
@staticmethod
def add_query_param_to_url(url: str, param_name: str, param: Any):

6
synapse/handlers/federation.py
View File

@ -238,7 +238,7 @@ class FederationHandler(BaseHandler):
logger.debug("[%s %s] min_depth: %d", room_id, event_id, min_depth)
prevs = set(pdu.prev_event_ids())
seen = await self.store.have_seen_events(prevs)
seen = await self.store.have_events_in_timeline(prevs)
if min_depth is not None and pdu.depth < min_depth:
# This is so that we don't notify the user about this
@ -278,7 +278,7 @@ class FederationHandler(BaseHandler):
# Update the set of things we've seen after trying to
# fetch the missing stuff
seen = await self.store.have_seen_events(prevs)
seen = await self.store.have_events_in_timeline(prevs)
if not prevs - seen:
logger.info(
@ -423,7 +423,7 @@ class FederationHandler(BaseHandler):
room_id = pdu.room_id
event_id = pdu.event_id
seen = await self.store.have_seen_events(prevs)
seen = await self.store.have_events_in_timeline(prevs)
if not prevs - seen:
return

13
synapse/handlers/oidc_handler.py
View File

@ -35,7 +35,7 @@ from typing_extensions import TypedDict
from twisted.web.client import readBody
from synapse.config import ConfigError
from synapse.http.server import finish_request
from synapse.http.server import respond_with_html
from synapse.http.site import SynapseRequest
from synapse.logging.context import make_deferred_yieldable
from synapse.push.mailer import load_jinja2_templates
@ -144,15 +144,10 @@ class OidcHandler:
access_denied.
error_description: A human-readable description of the error.
"""
html_bytes = self._error_template.render(
html = self._error_template.render(
error=error, error_description=error_description
).encode("utf-8")
request.setResponseCode(400)
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(b"Content-Length", b"%i" % len(html_bytes))
request.write(html_bytes)
finish_request(request)
)
respond_with_html(request, 400, html)
def _validate_metadata(self):
"""Verifies the provider metadata.

76
synapse/http/server.py
View File

@ -30,7 +30,7 @@ from twisted.internet import defer
from twisted.python import failure
from twisted.web import resource
from twisted.web.server import NOT_DONE_YET, Request
from twisted.web.static import NoRangeStaticProducer
from twisted.web.static import File, NoRangeStaticProducer
from twisted.web.util import redirectTo
import synapse.events
@ -202,12 +202,7 @@ def return_html_error(
else:
body = error_template.render(code=code, msg=msg)
body_bytes = body.encode("utf-8")
request.setResponseCode(code)
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(b"Content-Length", b"%i" % (len(body_bytes),))
request.write(body_bytes)
finish_request(request)
respond_with_html(request, code, body)
def wrap_async_request_handler(h):
@ -420,6 +415,18 @@ class DirectServeResource(resource.Resource):
return NOT_DONE_YET
class StaticResource(File):
"""
A resource that represents a plain non-interpreted file or directory.
Differs from the File resource by adding clickjacking protection.
"""
def render_GET(self, request: Request):
set_clickjacking_protection_headers(request)
return super().render_GET(request)
def _options_handler(request):
"""Request handler for OPTIONS requests
@ -530,7 +537,7 @@ def respond_with_json_bytes(
code (int): The HTTP response code.
json_bytes (bytes): The json bytes to use as the response body.
send_cors (bool): Whether to send Cross-Origin Resource Sharing headers
http://www.w3.org/TR/cors/
https://fetch.spec.whatwg.org/#http-cors-protocol
Returns:
twisted.web.server.NOT_DONE_YET"""
@ -568,6 +575,59 @@ def set_cors_headers(request):
)
def respond_with_html(request: Request, code: int, html: str):
"""
Wraps `respond_with_html_bytes` by first encoding HTML from a str to UTF-8 bytes.
"""
respond_with_html_bytes(request, code, html.encode("utf-8"))
def respond_with_html_bytes(request: Request, code: int, html_bytes: bytes):
"""
Sends HTML (encoded as UTF-8 bytes) as the response to the given request.
Note that this adds clickjacking protection headers and finishes the request.
Args:
request: The http request to respond to.
code: The HTTP response code.
html_bytes: The HTML bytes to use as the response body.
"""
# could alternatively use request.notifyFinish() and flip a flag when
# the Deferred fires, but since the flag is RIGHT THERE it seems like
# a waste.
if request._disconnected:
logger.warning(
"Not sending response to request %s, already disconnected.", request
)
return
request.setResponseCode(code)
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(b"Content-Length", b"%d" % (len(html_bytes),))
# Ensure this content cannot be embedded.
set_clickjacking_protection_headers(request)
request.write(html_bytes)
finish_request(request)
def set_clickjacking_protection_headers(request: Request):
"""
Set headers to guard against clickjacking of embedded content.
This sets the X-Frame-Options and Content-Security-Policy headers which instructs
browsers to not allow the HTML of the response to be embedded onto another
page.
Args:
request: The http request to add the headers to.
"""
request.setHeader(b"X-Frame-Options", b"DENY")
request.setHeader(b"Content-Security-Policy", b"frame-ancestors 'none';")
def finish_request(request):
""" Finish writing the response to the request.

10
synapse/rest/client/v1/pusher.py
View File

@ -16,7 +16,7 @@
import logging
from synapse.api.errors import Codes, StoreError, SynapseError
from synapse.http.server import finish_request
from synapse.http.server import respond_with_html_bytes
from synapse.http.servlet import (
RestServlet,
assert_params_in_dict,
@ -177,13 +177,9 @@ class PushersRemoveRestServlet(RestServlet):
self.notifier.on_new_replication_data()
request.setResponseCode(200)
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(
b"Content-Length", b"%d" % (len(PushersRemoveRestServlet.SUCCESS_HTML),)
respond_with_html_bytes(
request, 200, PushersRemoveRestServlet.SUCCESS_HTML,
)
request.write(PushersRemoveRestServlet.SUCCESS_HTML)
finish_request(request)
return None
def on_OPTIONS(self, _):

16
synapse/rest/client/v2_alpha/account.py
View File

@ -21,7 +21,7 @@ from six.moves import http_client
from synapse.api.constants import LoginType
from synapse.api.errors import Codes, SynapseError, ThreepidValidationError
from synapse.config.emailconfig import ThreepidBehaviour
from synapse.http.server import finish_request
from synapse.http.server import finish_request, respond_with_html
from synapse.http.servlet import (
RestServlet,
assert_params_in_dict,
@ -199,16 +199,15 @@ class PasswordResetSubmitTokenServlet(RestServlet):
# Otherwise show the success template
html = self.config.email_password_reset_template_success_html
request.setResponseCode(200)
status_code = 200
except ThreepidValidationError as e:
request.setResponseCode(e.code)
status_code = e.code
# Show a failure page with a reason
template_vars = {"failure_reason": e.msg}
html = self.failure_email_template.render(**template_vars)
request.write(html.encode("utf-8"))
finish_request(request)
respond_with_html(request, status_code, html)
class PasswordRestServlet(RestServlet):
@ -571,16 +570,15 @@ class AddThreepidEmailSubmitTokenServlet(RestServlet):
# Otherwise show the success template
html = self.config.email_add_threepid_template_success_html_content
request.setResponseCode(200)
status_code = 200
except ThreepidValidationError as e:
request.setResponseCode(e.code)
status_code = e.code
# Show a failure page with a reason
template_vars = {"failure_reason": e.msg}
html = self.failure_email_template.render(**template_vars)
request.write(html.encode("utf-8"))
finish_request(request)
respond_with_html(request, status_code, html)
class AddThreepidMsisdnSubmitTokenServlet(RestServlet):

11
synapse/rest/client/v2_alpha/account_validity.py
View File

@ -16,7 +16,7 @@
import logging
from synapse.api.errors import AuthError, SynapseError
from synapse.http.server import finish_request
from synapse.http.server import respond_with_html
from synapse.http.servlet import RestServlet
from ._base import client_patterns
@ -26,9 +26,6 @@ logger = logging.getLogger(__name__)
class AccountValidityRenewServlet(RestServlet):
PATTERNS = client_patterns("/account_validity/renew$")
SUCCESS_HTML = (
b"<html><body>Your account has been successfully renewed.</body><html>"
)
def __init__(self, hs):
"""
@ -59,11 +56,7 @@ class AccountValidityRenewServlet(RestServlet):
status_code = 404
response = self.failure_html
request.setResponseCode(status_code)
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(b"Content-Length", b"%d" % (len(response),))
request.write(response.encode("utf8"))
finish_request(request)
respond_with_html(request, status_code, response)
class AccountValiditySendMailServlet(RestServlet):

18
synapse/rest/client/v2_alpha/auth.py
View File

@ -18,7 +18,7 @@ import logging
from synapse.api.constants import LoginType
from synapse.api.errors import SynapseError
from synapse.api.urls import CLIENT_API_PREFIX
from synapse.http.server import finish_request
from synapse.http.server import respond_with_html
from synapse.http.servlet import RestServlet, parse_string
from ._base import client_patterns
@ -200,13 +200,7 @@ class AuthRestServlet(RestServlet):
raise SynapseError(404, "Unknown auth stage type")
# Render the HTML and return.
html_bytes = html.encode("utf8")
request.setResponseCode(200)
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(b"Content-Length", b"%d" % (len(html_bytes),))
request.write(html_bytes)
finish_request(request)
respond_with_html(request, 200, html)
return None
async def on_POST(self, request, stagetype):
@ -263,13 +257,7 @@ class AuthRestServlet(RestServlet):
raise SynapseError(404, "Unknown auth stage type")
# Render the HTML and return.
html_bytes = html.encode("utf8")
request.setResponseCode(200)
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(b"Content-Length", b"%d" % (len(html_bytes),))
request.write(html_bytes)
finish_request(request)
respond_with_html(request, 200, html)
return None
def on_OPTIONS(self, _):

10
synapse/rest/client/v2_alpha/register.py
View File

@ -38,7 +38,7 @@ from synapse.config.ratelimiting import FederationRateLimitConfig
from synapse.config.registration import RegistrationConfig
from synapse.config.server import is_threepid_reserved
from synapse.handlers.auth import AuthHandler
from synapse.http.server import finish_request
from synapse.http.server import finish_request, respond_with_html
from synapse.http.servlet import (
RestServlet,
assert_params_in_dict,
@ -306,17 +306,15 @@ class RegistrationSubmitTokenServlet(RestServlet):
# Otherwise show the success template
html = self.config.email_registration_template_success_html_content
request.setResponseCode(200)
status_code = 200
except ThreepidValidationError as e:
request.setResponseCode(e.code)
status_code = e.code
# Show a failure page with a reason
template_vars = {"failure_reason": e.msg}
html = self.failure_email_template.render(**template_vars)
request.write(html.encode("utf-8"))
finish_request(request)
respond_with_html(request, status_code, html)
class UsernameAvailabilityRestServlet(RestServlet):

10
synapse/rest/consent/consent_resource.py
View File

@ -29,7 +29,7 @@ from synapse.api.errors import NotFoundError, StoreError, SynapseError
from synapse.config import ConfigError
from synapse.http.server import (
DirectServeResource,
finish_request,
respond_with_html,
wrap_html_request_handler,
)
from synapse.http.servlet import parse_string
@ -197,12 +197,8 @@ class ConsentResource(DirectServeResource):
template_html = self._jinja_env.get_template(
path.join(TEMPLATE_LANGUAGE, template_name)
)
html_bytes = template_html.render(**template_args).encode("utf8")
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(b"Content-Length", b"%i" % len(html_bytes))
request.write(html_bytes)
finish_request(request)
html = template_html.render(**template_args)
respond_with_html(request, 200, html)
def _check_hash(self, userid, userhmac):
"""