fix: distrust incident certificates in Chromium and gRPC

Dockerfile

@@ -61,7 +61,12 @@ RUN python /usr/local/bin/check-ca-trust.py --system
 COPY requirements-bootstrap.txt /tmp/requirements-bootstrap.txt
 RUN python -m pip install --no-cache-dir --require-hashes --only-binary=:all: --no-deps -r /tmp/requirements-bootstrap.txt \
     && python /usr/local/bin/check-ca-trust.py --python
-ENV NODE_OPTIONS=--use-openssl-ca
+ENV NODE_OPTIONS=--use-openssl-ca \
+    GRPC_DEFAULT_SSL_ROOTS_FILE_PATH=/etc/ssl/certs/ca-certificates.crt
+
+# Chromium has a separate root store. Distrust the compromised intermediate
+# public keys explicitly, including cross-signs, without waiting for CRL updates.
+COPY docker/chromium-emudhra.json /etc/chromium/policies/managed/odysseus-emudhra.json
 
 # Private browser automation wrapper used by the native `private_browser` tool.
 # Chromium is installed above, so agent-browser can drive the existing browser
@@ -123,6 +128,10 @@ COPY --from=realesrgan-wheels /wheels/ /tmp/odysseus-wheels/
 RUN pip install --no-cache-dir --no-deps /tmp/odysseus-wheels/*.whl \
     && rm -rf /tmp/odysseus-wheels
 
+# Check gRPC's effective defaults after all Python dependencies are installed.
+# Its wheel can retain affected roots even when pip/certifi are current.
+RUN python /usr/local/bin/check-ca-trust.py --system --python --grpc
+
 # Copy app code
 COPY . .
 # Require the redistribution notices in the image build context.

docker/chromium-ca-policy.md

@@ -0,0 +1,20 @@
+# Chromium incident distrust policy
+
+`chromium-emudhra.json` is installed in the Docker image at `/etc/chromium/policies/managed/odysseus-emudhra.json`. Chromium 132 and later support `CADistrustedCertificates`: a list of base64-encoded DER X.509 certificates whose public keys must not be accepted for TLS server authentication. Matching is by SubjectPublicKeyInfo (SPKI), so one certificate per compromised key also blocks its cross-signs. This policy adds no trust, disables no certificate checks, and does not require a revocation-list download. Native browsers and other browser distributions require separately managed installation of the appropriate policy.
+
+Policy semantics: [Chromium's version-155 definition](https://github.com/chromium/chromium/blob/155.0.8059.79/components/policy/resources/templates/policy_definitions/CertificateManagement/CADistrustedCertificates.yaml). Linux installation paths: [Chromium policy documentation](https://www.chromium.org/administrators/configuring-policy-for-extensions/#linux).
+
+Public certificate source, retrieved 2026-10-21: [incident intermediate inventory](https://emudhra.we-have-a-problem.com/impacted-intermediates.json). Its downloaded JSON has SHA-256 `f67b3abe9b4879f4e91874ed041beccd71257f1db41c588c724ccf12aa90c59e`. Each selected certificate's DER fingerprint and public-key fingerprint were checked against that inventory before inclusion. The eight unique keys below are covered, including the code-signing intermediate keys listed in the incident. The policy contains only public certificates; no private key is included.
+
+| Intermediate | SHA-256 of DER SPKI |
+| --- | --- |
+| EM OV TLS CA - G3B | `43bffa19d6ef651451f6841e019931e96f6f2eaeff28ab4b6f1ce4576de2717b` |
+| EM DV TLS CA - G3C | `49dd353dc2b919a3770645117d0e60c16115e7d1bc259eefe734b00ea434fe5f` |
+| EM EV TLS CA - G3C | `5c0660a2b164910d8ff589c18e14552e9e0ec237dcefe2cb736d41a4811f81a0` |
+| EM OV TLS CA - G3C | `63ecefee431d49523bc1136c4e72d0206a477086caf606cd5cf025686c109cf8` |
+| EM OV CS CA - G3C | `92c063d67e8f14db71d288e11266ffdaf69cbf115f7bab14f3bc2f68d25e0e30` |
+| EM EV TLS CA - G3B | `e0254c7fcdc265e2f0f8a428dabb75ab4ae039b4872d62f5ee57f0877d5a8a41` |
+| EM DV TLS CA - G3B | `ebed6475c2c2d80fcb199f3fe8dd6e6b3ce60b77eb15d4e42c3dec0c6f5b5105` |
+| EM OV CS CA - G3B | `ec4ffa1ad0ac88081314b7aaffef6a91f97cd57291bb5ba686c5415f5eb4f6b6` |
+
+`tests/test_chromium_ca_policy.py` verifies that the policy distrusts exactly these eight keys using valid intermediate CA certificates and adds no trust settings. Changes to the encoded material need a fresh source/fingerprint check and behavioral validation: all twelve published incident HTTPS chains must be rejected by the actual Chromium binary while ordinary HTTPS still succeeds. Confirm loading and any policy errors at `chrome://policy`. Do not treat a passing PEM-store check as a browser-policy check.

docker/chromium-emudhra.json

@@ -0,0 +1,12 @@
+{
+  "CADistrustedCertificates": [
+    "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",
+    "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",
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+    "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",
+    "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",
+    "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",
+    "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",
+    "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"
+  ]
+}

docs/tls-trust.md

@@ -21,14 +21,18 @@ python scripts/check_ca_trust.py --system --python
 
 Explicit PEM bundles can also be passed as positional arguments. The check rejects the incident's known root fingerprints and malformed/empty bundles. It does not model native OS intermediate revocation, custom TLS implementations, or arbitrary certificates added by an operator.
 
-Both Docker build stages refresh system CA certificates and bootstrap pip/certifi before dependency installation. The build fails if affected roots remain. Node uses the corrected system store through `--use-openssl-ca`. Rebuild with a fresh base and dependency layers when remediating an existing deployment:
+Both Docker build stages refresh system CA certificates and bootstrap pip/certifi before dependency installation. The build fails if affected roots remain. Node uses the corrected system store through `--use-openssl-ca`. Python gRPC uses that same PEM file through `GRPC_DEFAULT_SSL_ROOTS_FILE_PATH`; updating certifi alone does not replace gRPC's independent wheel bundle. After dependency installation, the image checks gRPC's selected file as well. An explicit gRPC override must be readable and free of the incident roots: gRPC can otherwise fall back to its affected bundled defaults.
+
+Chromium uses a separate trust store. The Docker image installs a managed `CADistrustedCertificates` policy for the eight compromised intermediate public keys, covering their cross-signs without depending on background revocation updates. It adds no trusted certificate and does not disable certificate verification. The policy and public-certificate provenance are documented in [the browser policy note](../docker/chromium-ca-policy.md). Native browser installations and independently managed profiles require their own platform policy or vendor update; this image policy does not configure host browsers.
+
+Rebuild with a fresh base and dependency layers when remediating an existing deployment:
 
 ```sh
 docker compose build --pull --no-cache odysseus
 docker compose up -d odysseus
-docker compose exec odysseus python scripts/check_ca_trust.py --system --python
+docker compose exec odysseus python scripts/check_ca_trust.py --system --python --grpc
 ```
 
 SearXNG is a separate HTTPS client and image; updating the Odysseus image does not patch it. Inspect its effective CA path and update or rebuild that image independently. Also inspect persisted `/app/.local` packages, remote Cookbook environments, and externally configured MCP runtimes. Image replacement does not necessarily replace those environments.
 
-For behavioral validation, all twelve [published test chains](https://emudhra.we-have-a-problem.com/chains.zip), including the AAA cross-signs, must fail certificate verification through the effective stores. Confirm that an ordinary known-good HTTPS request still succeeds. Package versions and a successful image build alone do not prove that a running deployment selects the corrected store.
+For behavioral validation, all twelve [published test chains](https://emudhra.we-have-a-problem.com/chains.zip), including the AAA cross-signs, must fail certificate verification through the effective stores. Confirm that an ordinary known-good HTTPS request still succeeds. In Chromium, confirm the managed policy is loaded at `chrome://policy` and test the incident endpoints through the actual browser path with certificate verification enabled. The PEM checker cannot inspect Chromium's policy or its active verifier. Package versions and a successful image build alone do not prove that a running deployment selects the corrected store.

scripts/check_ca_trust.py

@@ -11,6 +11,7 @@ from __future__ import annotations
 import argparse
 import hashlib
 import importlib
+import importlib.util
 import os
 from pathlib import Path
 import re
@@ -64,14 +65,28 @@ def system_paths() -> list[Path]:
     return paths
 
 
+def grpc_roots_path() -> Path:
+    """Select gRPC's override or its independent Python-wheel default bundle."""
+    override = os.environ.get("GRPC_DEFAULT_SSL_ROOTS_FILE_PATH")
+    if override:
+        # gRPC can fall back to its bundled roots when this file is unreadable.
+        # Check the configured file strictly instead of blessing that fallback.
+        return Path(override)
+    spec = importlib.util.find_spec("grpc")
+    if spec is None or spec.origin is None:
+        raise ImportError("grpcio is not installed; cannot check its default roots")
+    return Path(spec.origin).parent / "_cython" / "_credentials" / "roots.pem"
+
+
 def main(argv: list[str] | None = None) -> int:
     parser = argparse.ArgumentParser(description=__doc__)
     parser.add_argument("bundles", nargs="*", type=Path)
     parser.add_argument("--system", action="store_true", help="check effective OpenSSL PEM stores")
     parser.add_argument("--python", action="store_true", help="check certifi and pip's separate vendored bundle")
+    parser.add_argument("--grpc", action="store_true", help="check gRPC's selected default CA file")
     args = parser.parse_args(argv)
-    if not (args.bundles or args.system or args.python):
+    if not (args.bundles or args.system or args.python or args.grpc):
-        parser.error("select --system, --python, or explicit PEM bundle paths")
+        parser.error("select --system, --python, --grpc, or explicit PEM bundle paths")
     try:
         paths = list(args.bundles)
         if args.system:
@@ -79,6 +94,8 @@ def main(argv: list[str] | None = None) -> int:
         if args.python:
             for name in ("certifi", "pip._vendor.certifi"):
                 paths.append(Path(importlib.import_module(name).where()))
+        if args.grpc:
+            paths.append(grpc_roots_path())
         paths = list(dict.fromkeys(path.resolve() for path in paths))
         errors = []
         for path in paths:

tests/test_ca_trust.py

@@ -7,6 +7,7 @@ import os
 from pathlib import Path
 import ssl
 import tempfile
+from types import SimpleNamespace
 import unittest
 from unittest.mock import patch
 
@@ -107,6 +108,41 @@ class CATrustTests(unittest.TestCase):
             self.assertEqual(result, 1)
             self.assertIn("AAA Certificate Services", errors.getvalue())
 
+    def test_grpc_bundled_roots_are_checked_without_an_override(self):
+        with tempfile.TemporaryDirectory() as temporary:
+            package = Path(temporary) / "grpc"
+            bundle = package / "_cython" / "_credentials" / "roots.pem"
+            bundle.parent.mkdir(parents=True)
+            bundle.write_bytes((self.fixtures / "emsign-g3.pem").read_bytes())
+            errors = io.StringIO()
+            with patch.dict(os.environ, {"GRPC_DEFAULT_SSL_ROOTS_FILE_PATH": ""}), patch.object(
+                checker.importlib.util, "find_spec", return_value=SimpleNamespace(origin=str(package / "__init__.py"))
+            ), contextlib.redirect_stderr(errors):
+                self.assertEqual(checker.main(["--grpc"]), 1)
+            self.assertIn("emSign ECC Root CA - G3", errors.getvalue())
+
+    def test_grpc_explicit_clean_store_replaces_the_independent_bundle(self):
+        with patch.dict(os.environ, {"GRPC_DEFAULT_SSL_ROOTS_FILE_PATH": str(self.fixtures / "emsign-g1.pem")}), patch.object(
+            checker.importlib.util, "find_spec", side_effect=AssertionError("must use the explicit store")
+        ), contextlib.redirect_stdout(io.StringIO()):
+            self.assertEqual(checker.main(["--grpc"]), 0)
+
+    def test_grpc_invalid_override_does_not_fall_back_silently(self):
+        with tempfile.TemporaryDirectory() as temporary:
+            for name, content in (("empty.pem", ""), ("malformed.pem", "not a certificate"), ("affected.pem", PUBLIC_CERTIFICATES["aaa.pem"])):
+                bundle = Path(temporary) / name
+                bundle.write_text(content)
+                with self.subTest(name=name), patch.dict(os.environ, {"GRPC_DEFAULT_SSL_ROOTS_FILE_PATH": str(bundle)}), contextlib.redirect_stderr(io.StringIO()):
+                    self.assertEqual(checker.main(["--grpc"]), 1)
+            with patch.dict(os.environ, {"GRPC_DEFAULT_SSL_ROOTS_FILE_PATH": str(Path(temporary) / "missing.pem")}), contextlib.redirect_stderr(io.StringIO()):
+                self.assertEqual(checker.main(["--grpc"]), 1)
+
+    def test_grpc_check_reports_a_missing_installation(self):
+        with patch.dict(os.environ, {"GRPC_DEFAULT_SSL_ROOTS_FILE_PATH": ""}), patch.object(
+            checker.importlib.util, "find_spec", return_value=None
+        ), contextlib.redirect_stderr(io.StringIO()):
+            self.assertEqual(checker.main(["--grpc"]), 1)
+
 
 # Public Mozilla CA certificates; provenance: tests/fixtures/ca-trust/README.md.
 PUBLIC_CERTIFICATES = {

tests/test_chromium_ca_policy.py

@@ -0,0 +1,41 @@
+"""The managed browser policy must distrust exactly the incident's eight keys."""
+
+import base64
+import hashlib
+import json
+from pathlib import Path
+import unittest
+
+from cryptography import x509
+from cryptography.hazmat.primitives import serialization
+
+
+ROOT = Path(__file__).resolve().parents[1]
+# Public incident inventory: impacted-intermediates.json, 2026-10-21.
+COMPROMISED_SPKIS = {
+    "43bffa19d6ef651451f6841e019931e96f6f2eaeff28ab4b6f1ce4576de2717b",
+    "49dd353dc2b919a3770645117d0e60c16115e7d1bc259eefe734b00ea434fe5f",
+    "5c0660a2b164910d8ff589c18e14552e9e0ec237dcefe2cb736d41a4811f81a0",
+    "63ecefee431d49523bc1136c4e72d0206a477086caf606cd5cf025686c109cf8",
+    "92c063d67e8f14db71d288e11266ffdaf69cbf115f7bab14f3bc2f68d25e0e30",
+    "e0254c7fcdc265e2f0f8a428dabb75ab4ae039b4872d62f5ee57f0877d5a8a41",
+    "ebed6475c2c2d80fcb199f3fe8dd6e6b3ce60b77eb15d4e42c3dec0c6f5b5105",
+    "ec4ffa1ad0ac88081314b7aaffef6a91f97cd57291bb5ba686c5415f5eb4f6b6",
+}
+
+
+class ChromiumCATrustTests(unittest.TestCase):
+    def test_policy_distrusts_each_compromised_key_without_adding_trust(self):
+        policy = json.loads((ROOT / "docker" / "chromium-emudhra.json").read_text())
+        self.assertEqual(set(policy), {"CADistrustedCertificates"})
+        self.assertEqual(len(policy["CADistrustedCertificates"]), 8)
+        keys = set()
+        for encoded in policy["CADistrustedCertificates"]:
+            certificate = x509.load_der_x509_certificate(base64.b64decode(encoded, validate=True))
+            self.assertTrue(certificate.extensions.get_extension_for_class(x509.BasicConstraints).value.ca)
+            self.assertNotEqual(certificate.subject, certificate.issuer)
+            public_key = certificate.public_key().public_bytes(
+                serialization.Encoding.DER, serialization.PublicFormat.SubjectPublicKeyInfo
+            )
+            keys.add(hashlib.sha256(public_key).hexdigest())
+        self.assertEqual(keys, COMPROMISED_SPKIS)