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Fix handling of User-Agent headers with bad utf-8. (#8632)

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Erik Johnston 2020-10-23 17:12:59 +01:00 committed by GitHub
parent db9ef792f0
commit c850dd9a8e
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8 changed files with 33 additions and 28 deletions
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1
changelog.d/8632.bugfix Normal file
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@ -0,0 +1 @@
Fix handling of User-Agent headers that are invalid UTF-8, which caused user agents of users to not get correctly recorded.

4
synapse/api/auth.py
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@ -184,9 +184,7 @@ class Auth:
"""
try:
ip_addr = self.hs.get_ip_from_request(request)
user_agent = request.requestHeaders.getRawHeaders(
b"User-Agent", default=[b""]
)[0].decode("ascii", "surrogateescape")
user_agent = request.get_user_agent("")
access_token = self.get_access_token_from_request(request)

4
synapse/handlers/auth.py
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@ -470,9 +470,7 @@ class AuthHandler(BaseHandler):
# authentication flow.
await self.store.set_ui_auth_clientdict(sid, clientdict)
user_agent = request.requestHeaders.getRawHeaders(b"User-Agent", default=[b""])[
0
].decode("ascii", "surrogateescape")
user_agent = request.get_user_agent("")
await self.store.add_user_agent_ip_to_ui_auth_session(
session.session_id, user_agent, clientip

4
synapse/handlers/cas_handler.py
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@ -212,9 +212,7 @@ class CasHandler:
else:
if not registered_user_id:
# Pull out the user-agent and IP from the request.
user_agent = request.requestHeaders.getRawHeaders(
b"User-Agent", default=[b""]
)[0].decode("ascii", "surrogateescape")
user_agent = request.get_user_agent("")
ip_address = self.hs.get_ip_from_request(request)
registered_user_id = await self._registration_handler.register_user(

4
synapse/handlers/oidc_handler.py
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@ -695,9 +695,7 @@ class OidcHandler:
return
# Pull out the user-agent and IP from the request.
user_agent = request.requestHeaders.getRawHeaders(b"User-Agent", default=[b""])[
0
].decode("ascii", "surrogateescape")
user_agent = request.get_user_agent("")
ip_address = self.hs.get_ip_from_request(request)
# Call the mapper to register/login the user

4
synapse/handlers/saml_handler.py
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@ -216,9 +216,7 @@ class SamlHandler:
return
# Pull out the user-agent and IP from the request.
user_agent = request.requestHeaders.getRawHeaders(b"User-Agent", default=[b""])[
0
].decode("ascii", "surrogateescape")
user_agent = request.get_user_agent("")
ip_address = self.hs.get_ip_from_request(request)
# Call the mapper to register/login the user

16
synapse/http/site.py
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@ -109,8 +109,14 @@ class SynapseRequest(Request):
method = self.method.decode("ascii")
return method
def get_user_agent(self):
return self.requestHeaders.getRawHeaders(b"User-Agent", [None])[-1]
def get_user_agent(self, default: str) -> str:
"""Return the last User-Agent header, or the given default.
"""
user_agent = self.requestHeaders.getRawHeaders(b"User-Agent", [None])[-1]
if user_agent is None:
return default
return user_agent.decode("ascii", "replace")
def render(self, resrc):
# this is called once a Resource has been found to serve the request; in our
@ -274,11 +280,7 @@ class SynapseRequest(Request):
# with maximum recursion trying to log errors about
# the charset problem.
# c.f. https://github.com/matrix-org/synapse/issues/3471
user_agent = self.get_user_agent()
if user_agent is not None:
user_agent = user_agent.decode("utf-8", "replace")
else:
user_agent = "-"
user_agent = self.get_user_agent("-")
code = str(self.code)
if not self.finished:

24
tests/handlers/test_oidc.py
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@ -394,7 +394,14 @@ class OidcHandlerTestCase(HomeserverTestCase):
self.handler._map_userinfo_to_user = simple_async_mock(return_value=user_id)
self.handler._auth_handler.complete_sso_login = simple_async_mock()
request = Mock(
spec=["args", "getCookie", "addCookie", "requestHeaders", "getClientIP"]
spec=[
"args",
"getCookie",
"addCookie",
"requestHeaders",
"getClientIP",
"get_user_agent",
]
)
code = "code"
@ -414,9 +421,8 @@ class OidcHandlerTestCase(HomeserverTestCase):
request.args[b"code"] = [code.encode("utf-8")]
request.args[b"state"] = [state.encode("utf-8")]
request.requestHeaders = Mock(spec=["getRawHeaders"])
request.requestHeaders.getRawHeaders.return_value = [user_agent.encode("ascii")]
request.getClientIP.return_value = ip_address
request.get_user_agent.return_value = user_agent
self.get_success(self.handler.handle_oidc_callback(request))
@ -621,7 +627,14 @@ class OidcHandlerTestCase(HomeserverTestCase):
self.handler._map_userinfo_to_user = simple_async_mock(return_value=user_id)
self.handler._auth_handler.complete_sso_login = simple_async_mock()
request = Mock(
spec=["args", "getCookie", "addCookie", "requestHeaders", "getClientIP"]
spec=[
"args",
"getCookie",
"addCookie",
"requestHeaders",
"getClientIP",
"get_user_agent",
]
)
state = "state"
@ -637,9 +650,8 @@ class OidcHandlerTestCase(HomeserverTestCase):
request.args[b"code"] = [b"code"]
request.args[b"state"] = [state.encode("utf-8")]
request.requestHeaders = Mock(spec=["getRawHeaders"])
request.requestHeaders.getRawHeaders.return_value = [b"Browser"]
request.getClientIP.return_value = "10.0.0.1"
request.get_user_agent.return_value = "Browser"
self.get_success(self.handler.handle_oidc_callback(request))