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Fix access token leak to logs from proxyagent (#13855)

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This can happen specifically with an application service `/transactions/10722?access_token=leaked` request

Fix https://github.com/matrix-org/synapse/issues/13010

---

Saw an example leak in https://github.com/matrix-org/synapse/issues/13423#issuecomment-1205348482

```
2022-08-04 14:47:57,925 - synapse.http.client - 401 - DEBUG - as-sender-signal-1 - Sending request PUT http://localhost:29328/transactions/10722?access_token=<redacted>
2022-08-04 14:47:57,926 - synapse.http.proxyagent - 223 - DEBUG - as-sender-signal-1 - Requesting b'http://localhost:29328/transactions/10722?access_token=leaked' via <HostnameEndpoint localhost:29328>
```
This commit is contained in:
Eric Eastwood 2022-09-23 11:49:39 -05:00 committed by GitHub
parent e3512a7719
commit db868db594
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2 changed files with 7 additions and 1 deletions
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changelog.d/13855.bugfix Normal file
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@ -0,0 +1 @@
Fix access token leak to logs from proxy agent.

7
synapse/http/proxyagent.py
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@ -36,6 +36,7 @@ from twisted.web.error import SchemeNotSupported
from twisted.web.http_headers import Headers
from twisted.web.iweb import IAgent, IBodyProducer, IPolicyForHTTPS
from synapse.http import redact_uri
from synapse.http.connectproxyclient import HTTPConnectProxyEndpoint, ProxyCredentials
from synapse.types import ISynapseReactor
@ -220,7 +221,11 @@ class ProxyAgent(_AgentBase):
self._reactor, parsed_uri.host, parsed_uri.port, **self._endpoint_kwargs
)
logger.debug("Requesting %s via %s", uri, endpoint)
logger.debug(
"Requesting %s via %s",
redact_uri(uri.decode("ascii", errors="replace")),
endpoint,
)
if parsed_uri.scheme == b"https":
tls_connection_creator = self._policy_for_https.creatorForNetloc(