fix(egress): redact the per-bottle token in the now-active multi-tenant response log

Self-review of this PR: making `response()` run in the consolidated gateway
also activates its `LOG_FULL` `_log_response` call there — previously
unreachable, since the empty static config made `response()` return early. That
logger redacted with `os.environ`, which in multi-tenant mode does NOT hold the
bottle's per-request `/resolve` tokens (only the resolved `env` overlay does),
so a non-token-shaped provisioned secret appearing in a response could be logged
in the clear.

Thread the resolved per-flow `env` into `_log_request` / `_log_response` so the
LOG_FULL redaction scrubs the calling bottle's secrets. Adds a regression test
(a non-token-shaped `/resolve` secret, absent from os.environ, must not appear
in the response log) and updates the redaction-test helpers for the new arg.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UoEZHDjv84ChoZbozQERhJ

bot_bottle/egress_addon.py

@@ -233,31 +233,39 @@ class EgressAddon:
             {"Content-Type": "text/plain; charset=utf-8"},
         )
 
-    def _log_request(self, flow: http.HTTPFlow) -> None:
+    def _log_request(
+        self, flow: http.HTTPFlow, env: "typing.Mapping[str, str]",
+    ) -> None:
+        # `env` is the per-flow resolved overlay (process env + this bottle's
+        # /resolve tokens), so the log redaction scrubs the calling bottle's
+        # provisioned secrets — not just the process-level ones in os.environ.
         headers = {
-            k: redact_tokens(v, env=os.environ)
+            k: redact_tokens(v, env=env)
             for k, v in flow.request.headers.items()
             if k.lower() != "authorization"
         }
-        body = redact_tokens(flow.request.get_text(strict=False) or "", env=os.environ)
+        body = redact_tokens(flow.request.get_text(strict=False) or "", env=env)
         sys.stderr.write(
             json.dumps({
                 "event": "egress_request",
-                "host": redact_tokens(flow.request.pretty_host, env=os.environ),
+                "host": redact_tokens(flow.request.pretty_host, env=env),
                 "method": flow.request.method,
-                "path": redact_tokens(flow.request.path, env=os.environ),
+                "path": redact_tokens(flow.request.path, env=env),
                 "headers": headers,
                 "body": body,
             })
             + "\n"
         )
 
-    def _log_response(self, flow: http.HTTPFlow) -> None:
+    def _log_response(
+        self, flow: http.HTTPFlow, env: "typing.Mapping[str, str]",
+    ) -> None:
+        # Per-flow env overlay (see _log_request): redact this bottle's tokens.
         headers = {
-            k: redact_tokens(v, env=os.environ)
+            k: redact_tokens(v, env=env)
             for k, v in flow.response.headers.items()
         }
-        body = redact_tokens(flow.response.get_text(strict=False) or "", env=os.environ)
+        body = redact_tokens(flow.response.get_text(strict=False) or "", env=env)
         sys.stderr.write(
             json.dumps({
                 "event": "egress_response",
@@ -420,7 +428,7 @@ class EgressAddon:
             flow.request.headers["authorization"] = decision.inject_authorization
 
         if config.log >= LOG_FULL:
-            self._log_request(flow)
+            self._log_request(flow, env)
 
     def _block_dlp(self, flow: http.HTTPFlow, result: ScanResult) -> None:
         ctx = self._req_ctx(flow)
@@ -632,14 +640,14 @@ class EgressAddon:
         """DLP inbound scan on response headers and body, against the calling
         bottle's resolved config (multi-tenant) or the static config
         (single-tenant) — see `_flow_ctx`."""
-        config, _slug, _env = self._flow_ctx(flow)
+        config, _slug, env = self._flow_ctx(flow)
         route = match_route(config.routes, flow.request.pretty_host)
         if route is None:
             return
         if flow.response is None:
             return
         if config.log >= LOG_FULL:
-            self._log_response(flow)
+            self._log_response(flow, env)
         resp_headers = {k.lower(): v for k, v in flow.response.headers.items()}
         body = flow.response.get_text(strict=False) or ""
         scan_text = build_inbound_scan_text(resp_headers, body)

tests/unit/test_egress_addon_log_redaction.py

@@ -8,6 +8,7 @@ real mitmproxy package."""
 from __future__ import annotations
 
 import json
+import os
 import sys
 import types
 import unittest
@@ -107,14 +108,14 @@ class _Flow:
 def _log_request(addon: EgressAddon, flow: _Flow) -> dict[str, Any]:
     buf = StringIO()
     with patch("sys.stderr", buf):
-        addon._log_request(flow)  # type: ignore[arg-type]
+        addon._log_request(flow, os.environ)  # type: ignore[arg-type]
     return json.loads(buf.getvalue())
 
 
 def _log_response(addon: EgressAddon, flow: _Flow) -> dict[str, Any]:
     buf = StringIO()
     with patch("sys.stderr", buf):
-        addon._log_response(flow)  # type: ignore[arg-type]
+        addon._log_response(flow, os.environ)  # type: ignore[arg-type]
     return json.loads(buf.getvalue())
 
 

tests/unit/test_egress_addon_request_flow.py

@@ -906,6 +906,34 @@ class TestMultiTenantInboundDlp(unittest.TestCase):
         addon.websocket_message(flow)  # type: ignore[arg-type]
         self.assertTrue(flow.killed)
 
+    def test_response_log_redacts_per_bottle_resolve_token(self) -> None:
+        # LOG_FULL response logging now runs in multi-tenant mode, so it must
+        # scrub the calling bottle's /resolve token — which lives only in the
+        # resolved env overlay, never in the gateway's os.environ. A
+        # non-token-shaped secret is caught only via that env, so os.environ
+        # redaction (the pre-fix behaviour) would leak it into the log.
+        secret = "bottle-a-provisioned-secret-value"
+        policy = "log: 2\nroutes:\n  - host: api.example.com\n"
+
+        class _TokenResolver:
+            def resolve_policy_and_bottle_id(
+                self, ip: str, identity_token: str = "",
+            ) -> tuple[str | None, str | None, dict[str, str]]:
+                del ip, identity_token
+                return policy, "bottle-a", {"EGRESS_TOKEN_0": secret}
+
+        addon = _addon(Config(routes=()))
+        addon._resolver = cast(Any, _TokenResolver())
+        flow = _with_client_ip(_Flow(_Request(host="api.example.com")), "10.0.0.1")
+        _run_request(addon, flow)
+        flow.response = _Response(200, content=f"echo {secret} back")
+        buf = StringIO()
+        with patch("sys.stderr", buf):
+            addon.response(flow)  # type: ignore[arg-type]
+        logged = buf.getvalue()
+        self.assertIn("egress_response", logged)  # LOG_FULL logged the response
+        self.assertNotIn(secret, logged)  # redacted via the resolved env overlay
+
     def test_unattributed_flow_has_no_route_so_frame_passes(self) -> None:
         # An unattributed source resolves to a deny-all (empty) config, so the
         # request is blocked at the upgrade and any later frame has no route to