fix(assessment): establish independent release trust

docs/CAPABILITY_AND_INFRASTRUCTURE_FIT.md

@@ -333,24 +333,42 @@ requirement changed.
 ### Repeatable release rerun
 
 The release-aware rerun tool validates the machine-readable assessment against
-its JSON Schema, verifies the catalog's Ed25519 signature and pinned keyring
+its JSON Schema, verifies the catalog's Ed25519 signature against an
-hash, compares catalog sequence and module versions, and—when local checkouts
+independently pinned local trust keyring, and separately verifies the canonical
-are available—checks that each annotated release tag still peels to the assessed
+hash of the published or candidate keyring pinned by the signed catalog. The
-commit. Release drift produces a machine-readable list of affected capability
+downloaded keyring is therefore never its own sole trust root. The tool compares
-and infrastructure conclusions instead of silently carrying their prior status
+catalog sequence and module versions and—when local checkouts are available—checks
+annotated release tags against assessed commits. For repositories represented in
+signed `release.selected_units`, both the peeled commit and annotated tag-object
+ID must match exactly; re-annotating an unchanged commit requires review.
+Release drift produces a machine-readable list of affected capability and
+infrastructure conclusions instead of silently carrying their prior status
 forward:
 
 ```bash
-./.venv/bin/python tools/assessments/capability-fit.py --public
+./.venv/bin/python tools/assessments/capability-fit.py \
+  --public \
+  --trusted-keyring /srv/govoplan/trust/catalog-keyring.json
 ```
 
-Use `--catalog PATH --keyring PATH` for an offline or release-candidate rerun and
+Use `--catalog CATALOG --keyring PUBLISHED_OR_CANDIDATE_KEYRING
-`--json` or `--output PATH` for automation. Exit status `0` means the assessed
+--trusted-keyring PINNED_LOCAL_KEYRING` for an offline or release-candidate
-release metadata is current, `2` means explicit review is required, and `1`
+rerun. `GOVOPLAN_MODULE_PACKAGE_CATALOG_TRUSTED_KEYS_FILE` may provide the
-means the schema or trust checks are blocked. A successful rerun proves only the
+independently managed local trust-root path instead. During key rotation this
-assessment schema, signed catalog metadata, and optional local tag provenance;
+local file may contain both current and `next` keys within their validity
-it does not prove installed artifacts, target providers, target infrastructure,
+windows; revoked, disabled and retired keys are rejected. Do not establish this
-or production fitness. Those remain separate proof checks above.
+trust file by downloading it in the same rerun. Public JSON responses are
+bounded to 16 MiB. Use `--json` or `--output PATH` for automation.
+
+Exit status `0` means the assessed release metadata is current, `2` means
+explicit review is required, and `1` means the schema or trust checks are
+blocked. The machine report distinguishes independent signature trust,
+published-keyring hash agreement, and local-tag proof. Local-tag proof is only
+marked checked when every composition entry is available for comparison and was
+attempted. A successful rerun proves only the assessment schema, signed catalog
+metadata, published-keyring integrity and optional local tag provenance; it does
+not prove installed artifacts, target providers, target infrastructure, or
+production fitness. Those remain separate proof checks above.
 
 ## Evidence used in this slice
 
@@ -365,7 +383,8 @@ or production fitness. Those remain separate proof checks above.
   Files, Mail, Audit and Addresses tests
 - [Campaign delivery runbook](https://git.add-ideas.de/add-ideas/govoplan-campaign/src/branch/main/docs/CAMPAIGN_DELIVERY_RUNBOOK.md)
 - [Live signed stable catalog](https://govoplan.add-ideas.de/catalogs/v1/channels/stable.json)
-  and [trusted keyring](https://govoplan.add-ideas.de/catalogs/v1/keyring.json)
+  and [published keyring](https://govoplan.add-ideas.de/catalogs/v1/keyring.json),
+  verified against a separately provisioned local trust keyring
 - Annotated source tags `govoplan-core/v0.1.13` and
   `govoplan-campaign/v0.1.10`, including their catalogued Python and WebUI refs
 

tests/test_capability_fit_review.py

@@ -8,6 +8,7 @@ import importlib.util
 import json
 import os
 from pathlib import Path
+import subprocess
 import sys
 import tempfile
 from unittest import mock
@@ -28,6 +29,7 @@ from govoplan_assessment.capability_fit import (  # noqa: E402
     local_tag_provenance,
     render_review,
     review_capability_fit,
+    trusted_keys_from_keyring,
 )
 
 
@@ -52,7 +54,8 @@ class CapabilityFitReviewTests(unittest.TestCase):
             assessment=deepcopy(self.assessment),
             schema=self.schema,
             catalog=catalog,
-            keyring=keyring,
+            published_keyring=keyring,
+            trusted_keyring=keyring,
         )
 
         self.assertEqual("current", report["status"])
@@ -64,7 +67,8 @@ class CapabilityFitReviewTests(unittest.TestCase):
             assessment=deepcopy(self.assessment),
             schema=self.schema,
             catalog=catalog,
-            keyring=keyring,
+            published_keyring=keyring,
+            trusted_keyring=keyring,
         )
         self.assertEqual(
             json.dumps(report, sort_keys=True), json.dumps(repeated, sort_keys=True)
@@ -79,7 +83,8 @@ class CapabilityFitReviewTests(unittest.TestCase):
             assessment=deepcopy(self.assessment),
             schema=self.schema,
             catalog=catalog,
-            keyring=keyring,
+            published_keyring=keyring,
+            trusted_keyring=keyring,
         )
 
         self.assertEqual("review_required", report["status"])
@@ -114,7 +119,8 @@ class CapabilityFitReviewTests(unittest.TestCase):
             assessment=deepcopy(self.assessment),
             schema=self.schema,
             catalog=catalog,
-            keyring=keyring,
+            published_keyring=keyring,
+            trusted_keyring=keyring,
         )
 
         self.assertEqual("blocked", report["status"])
@@ -147,7 +153,8 @@ class CapabilityFitReviewTests(unittest.TestCase):
             assessment=deepcopy(self.assessment),
             schema=self.schema,
             catalog=catalog,
-            keyring=keyring,
+            published_keyring=keyring,
+            trusted_keyring=keyring,
         )
 
         self.assertEqual("review_required", report["status"])
@@ -201,7 +208,8 @@ class CapabilityFitReviewTests(unittest.TestCase):
                     assessment=deepcopy(self.assessment),
                     schema=self.schema,
                     catalog=catalog,
-                    keyring=keyring,
+                    published_keyring=keyring,
+                    trusted_keyring=keyring,
                 )
 
                 self.assertEqual("blocked", report["status"])
@@ -231,7 +239,8 @@ class CapabilityFitReviewTests(unittest.TestCase):
                     assessment=deepcopy(self.assessment),
                     schema=self.schema,
                     catalog=catalog,
-                    keyring=keyring,
+                    published_keyring=keyring,
+                    trusted_keyring=keyring,
                 )
                 self.assertEqual(
                     replay_environment,
@@ -241,24 +250,43 @@ class CapabilityFitReviewTests(unittest.TestCase):
         self.assertEqual("current", report["status"])
         self.assertTrue(report["proof_scope"]["catalog_signature_and_keyring"]["valid"])
 
-    def test_untrusted_or_substituted_keyring_blocks_rerun(self) -> None:
+    def test_self_consistent_substitution_fails_independent_trust_root(self) -> None:
-        catalog, _ = signed_catalog(self.assessment)
+        _, trusted_keyring = signed_catalog(self.assessment)
-        _, other_keyring = signed_catalog(self.assessment)
+        catalog, published_keyring = signed_catalog(self.assessment)
 
         report = review_capability_fit(
             assessment=deepcopy(self.assessment),
             schema=self.schema,
             catalog=catalog,
-            keyring=other_keyring,
+            published_keyring=published_keyring,
+            trusted_keyring=trusted_keyring,
         )
 
         self.assertEqual("blocked", report["status"])
         codes = {item["code"] for item in report["findings"]}
         self.assertIn("catalog_trust", codes)
-        self.assertIn("catalog_keyring_hash_mismatch", codes)
+        self.assertNotIn("catalog_keyring_hash_mismatch", codes)
         self.assertTrue(report["proof_scope"]["assessment_schema"]["valid"])
         self.assertFalse(
-            report["proof_scope"]["catalog_signature_and_keyring"]["valid"]
+            report["proof_scope"]["catalog_signature_and_trusted_keyring"]["valid"]
+        )
+        self.assertTrue(report["proof_scope"]["published_keyring_hash"]["valid"])
+
+    def test_locally_pinned_rotation_keys_follow_core_status_semantics(self) -> None:
+        keys = trusted_keys_from_keyring(
+            {
+                "keys": [
+                    {"key_id": "active", "status": "active", "public_key": "a"},
+                    {"key_id": "next", "status": "next", "public_key": "b"},
+                    {"key_id": "retired", "status": "retired", "public_key": "c"},
+                ]
+            }
+        )
+
+        self.assertEqual({"active": "a", "next": "b"}, keys)
+        self.assertEqual(
+            {"legacy": "base64-key"},
+            trusted_keys_from_keyring({"legacy": "base64-key"}),
         )
 
     def test_schema_error_blocks_before_comparison(self) -> None:
@@ -270,7 +298,8 @@ class CapabilityFitReviewTests(unittest.TestCase):
             assessment=assessment,
             schema=self.schema,
             catalog=catalog,
-            keyring=keyring,
+            published_keyring=keyring,
+            trusted_keyring=keyring,
         )
 
         self.assertEqual("blocked", report["status"])
@@ -291,7 +320,8 @@ class CapabilityFitReviewTests(unittest.TestCase):
             assessment=deepcopy(self.assessment),
             schema=self.schema,
             catalog=catalog,
-            keyring=keyring,
+            published_keyring=keyring,
+            trusted_keyring=keyring,
         )
 
         rendered = render_review(report)
@@ -308,6 +338,9 @@ class CapabilityFitReviewTests(unittest.TestCase):
         module = importlib.util.module_from_spec(spec)
         spec.loader.exec_module(module)
 
+        with tempfile.TemporaryDirectory() as temp_dir:
+            trusted_path = Path(temp_dir) / "trusted-keyring.json"
+            trusted_path.write_text('{"keys": []}\n', encoding="utf-8")
             with mock.patch.object(
                 module,
                 "fetch_json",
@@ -319,8 +352,176 @@ class CapabilityFitReviewTests(unittest.TestCase):
                 with self.assertRaisesRegex(
                     SystemExit, r"^Could not fetch fixed public catalog endpoint[.]$"
                 ):
+                    module.main(
+                        [
+                            "--public",
+                            "--trusted-keyring",
+                            str(trusted_path),
+                            "--skip-tag-provenance",
+                        ]
+                    )
+
+    def test_cli_requires_an_independent_local_trust_root(self) -> None:
+        script = META_ROOT / "tools" / "assessments" / "capability-fit.py"
+        spec = importlib.util.spec_from_file_location(
+            "capability_fit_cli_trust", script
+        )
+        assert spec is not None and spec.loader is not None
+        module = importlib.util.module_from_spec(spec)
+        spec.loader.exec_module(module)
+
+        with mock.patch.dict(
+            os.environ,
+            {module.TRUSTED_KEYRING_FILE_ENV: ""},
+            clear=False,
+        ):
+            with self.assertRaisesRegex(SystemExit, r"--trusted-keyring .* required"):
                 module.main(["--public", "--skip-tag-provenance"])
 
+    def test_local_selected_tag_commit_and_object_must_match_exactly(self) -> None:
+        with tempfile.TemporaryDirectory() as temp_dir:
+            workspace = Path(temp_dir)
+            commit_sha, tag_object_sha = create_tagged_repository(
+                workspace=workspace,
+                repository="govoplan-core",
+                version="0.1.0",
+            )
+            assessment = deepcopy(self.assessment)
+            core = next(
+                deepcopy(item)
+                for item in assessment["composition"]
+                if item["module_id"] == "core"
+            )
+            core["manifest_version"] = "0.1.0"
+            core["commit"] = commit_sha[:12]
+            assessment["composition"] = [core]
+            selected_unit = {
+                "repo": "govoplan-core",
+                "version": "0.1.0",
+                "tag": "v0.1.0",
+                "commit_sha": commit_sha,
+                "tag_object_sha": tag_object_sha,
+            }
+            catalog, keyring = signed_catalog(
+                assessment,
+                selected_units=[selected_unit],
+            )
+
+            baseline = review_capability_fit(
+                assessment=deepcopy(assessment),
+                schema=self.schema,
+                catalog=catalog,
+                published_keyring=keyring,
+                trusted_keyring=keyring,
+                workspace_root=workspace,
+            )
+
+            self.assertEqual("current", baseline["status"])
+            self.assertTrue(baseline["proof_scope"]["local_tag_provenance"]["valid"])
+
+            forged_commit = commit_sha[:12] + ("0" * 28)
+            if forged_commit == commit_sha:
+                forged_commit = commit_sha[:12] + ("f" * 28)
+            forged_catalog, forged_keyring = signed_catalog(
+                assessment,
+                selected_units=[{**selected_unit, "commit_sha": forged_commit}],
+            )
+            commit_mismatch = review_capability_fit(
+                assessment=deepcopy(assessment),
+                schema=self.schema,
+                catalog=forged_catalog,
+                published_keyring=forged_keyring,
+                trusted_keyring=forged_keyring,
+                workspace_root=workspace,
+            )
+
+            self.assertEqual("review_required", commit_mismatch["status"])
+            self.assertIn(
+                "tag_signed_commit_changed",
+                {item["kind"] for item in commit_mismatch["changes"]},
+            )
+
+            repo = workspace / "govoplan-core"
+            git_text(repo, "tag", "-d", "v0.1.0")
+            git_text(repo, "tag", "-a", "v0.1.0", "-m", "Re-annotated release")
+            reannotated = review_capability_fit(
+                assessment=deepcopy(assessment),
+                schema=self.schema,
+                catalog=catalog,
+                published_keyring=keyring,
+                trusted_keyring=keyring,
+                workspace_root=workspace,
+            )
+
+        self.assertEqual("review_required", reannotated["status"])
+        self.assertIn(
+            "tag_object_changed",
+            {item["kind"] for item in reannotated["changes"]},
+        )
+        self.assertTrue(reannotated["proof_scope"]["local_tag_provenance"]["checked"])
+        self.assertFalse(reannotated["proof_scope"]["local_tag_provenance"]["valid"])
+
+    def test_missing_composition_entry_does_not_claim_complete_tag_proof(self) -> None:
+        with tempfile.TemporaryDirectory() as temp_dir:
+            workspace = Path(temp_dir)
+            core_commit, core_tag_object = create_tagged_repository(
+                workspace=workspace,
+                repository="govoplan-core",
+                version="0.1.0",
+            )
+            tenancy_commit, _ = create_tagged_repository(
+                workspace=workspace,
+                repository="govoplan-tenancy",
+                version="0.1.0",
+            )
+            reviewed_assessment = deepcopy(self.assessment)
+            core = next(
+                deepcopy(item)
+                for item in reviewed_assessment["composition"]
+                if item["module_id"] == "core"
+            )
+            tenancy = next(
+                deepcopy(item)
+                for item in reviewed_assessment["composition"]
+                if item["module_id"] == "tenancy"
+            )
+            core.update(manifest_version="0.1.0", commit=core_commit[:12])
+            tenancy.update(manifest_version="0.1.0", commit=tenancy_commit[:12])
+            catalog_assessment = deepcopy(reviewed_assessment)
+            catalog_assessment["composition"] = [core]
+            reviewed_assessment["composition"] = [core, tenancy]
+            catalog, keyring = signed_catalog(
+                catalog_assessment,
+                selected_units=[
+                    {
+                        "repo": "govoplan-core",
+                        "version": "0.1.0",
+                        "tag": "v0.1.0",
+                        "commit_sha": core_commit,
+                        "tag_object_sha": core_tag_object,
+                    }
+                ],
+            )
+
+            report = review_capability_fit(
+                assessment=reviewed_assessment,
+                schema=self.schema,
+                catalog=catalog,
+                published_keyring=keyring,
+                trusted_keyring=keyring,
+                workspace_root=workspace,
+            )
+
+        proof = report["proof_scope"]["local_tag_provenance"]
+        self.assertEqual("review_required", report["status"])
+        self.assertFalse(proof["checked"])
+        self.assertIsNone(proof["valid"])
+        self.assertEqual(2, proof["attempted_count"])
+        self.assertEqual(2, proof["expected_count"])
+        self.assertNotIn(
+            "tag_provenance_changed", {item["code"] for item in report["findings"]}
+        )
+
     def test_repository_path_traversal_is_not_resolved(self) -> None:
         with mock.patch("govoplan_assessment.capability_fit.subprocess.run") as run:
             result = local_tag_provenance(
@@ -335,6 +536,36 @@ class CapabilityFitReviewTests(unittest.TestCase):
         run.assert_not_called()
 
 
+def create_tagged_repository(
+    *, workspace: Path, repository: str, version: str
+) -> tuple[str, str]:
+    repo = workspace / repository
+    git_text(workspace, "init", "-b", "main", str(repo))
+    git_text(repo, "config", "user.name", "Capability Fit Test")
+    git_text(repo, "config", "user.email", "capability-fit@example.invalid")
+    (repo / "README.md").write_text(f"{repository}\n", encoding="utf-8")
+    git_text(repo, "add", "README.md")
+    git_text(repo, "commit", "-m", "Initial release fixture")
+    git_text(repo, "tag", "-a", f"v{version}", "-m", f"Release v{version}")
+    return (
+        git_text(repo, "rev-parse", "HEAD"),
+        git_text(repo, "rev-parse", f"refs/tags/v{version}"),
+    )
+
+
+def git_text(cwd: Path, *args: str) -> str:
+    result = subprocess.run(
+        ("git", *args),
+        cwd=cwd,
+        check=False,
+        capture_output=True,
+        text=True,
+    )
+    if result.returncode != 0:
+        raise AssertionError(result.stderr or result.stdout)
+    return result.stdout.strip()
+
+
 def signed_catalog(
     assessment: dict[str, object],
     *,

tests/test_release_http_fetch.py

@@ -0,0 +1,72 @@
+from __future__ import annotations
+
+import sys
+import unittest
+from pathlib import Path
+from unittest import mock
+
+
+META_ROOT = Path(__file__).resolve().parents[1]
+RELEASE_ROOT = META_ROOT / "tools" / "release"
+if str(RELEASE_ROOT) not in sys.path:
+    sys.path.insert(0, str(RELEASE_ROOT))
+
+from govoplan_release.http_fetch import (  # noqa: E402
+    DEFAULT_MAX_RESPONSE_BYTES,
+    fetch_http,
+)
+
+
+class ReleaseHttpFetchTests(unittest.TestCase):
+    def test_content_length_over_default_limit_blocks_before_read(self) -> None:
+        response = FakeResponse(
+            body=b"ignored",
+            headers={"Content-Length": str(DEFAULT_MAX_RESPONSE_BYTES + 1)},
+        )
+
+        with mock.patch(
+            "govoplan_release.http_fetch.urllib.request.urlopen",
+            return_value=response,
+        ):
+            with self.assertRaisesRegex(ValueError, "exceeds the configured size"):
+                fetch_http("https://example.invalid/catalog.json", timeout=1)
+
+        self.assertEqual([], response.read_sizes)
+
+    def test_streamed_body_is_capped_when_length_is_absent(self) -> None:
+        response = FakeResponse(body=b"x" * 9, headers={})
+
+        with mock.patch(
+            "govoplan_release.http_fetch.urllib.request.urlopen",
+            return_value=response,
+        ):
+            with self.assertRaisesRegex(ValueError, "exceeds the configured size"):
+                fetch_http(
+                    "https://example.invalid/catalog.json",
+                    timeout=1,
+                    max_response_bytes=8,
+                )
+
+        self.assertEqual([9], response.read_sizes)
+
+
+class FakeResponse:
+    def __init__(self, *, body: bytes, headers: dict[str, str]) -> None:
+        self.status = 200
+        self.headers = headers
+        self.body = body
+        self.read_sizes: list[int] = []
+
+    def __enter__(self) -> FakeResponse:
+        return self
+
+    def __exit__(self, *args: object) -> None:
+        return None
+
+    def read(self, size: int) -> bytes:
+        self.read_sizes.append(size)
+        return self.body[:size]
+
+
+if __name__ == "__main__":
+    unittest.main()

tools/assessments/capability-fit.py

@@ -5,6 +5,7 @@ from __future__ import annotations
 
 import argparse
 import json
+import os
 from pathlib import Path
 import sys
 
@@ -20,6 +21,9 @@ from govoplan_assessment import render_review, review_capability_fit  # noqa: E4
 from govoplan_release.catalog import DEFAULT_PUBLIC_BASE_URL, fetch_json  # noqa: E402
 
 
+TRUSTED_KEYRING_FILE_ENV = "GOVOPLAN_MODULE_PACKAGE_CATALOG_TRUSTED_KEYS_FILE"
+
+
 def parse_args(argv: list[str] | None = None) -> argparse.Namespace:
     parser = argparse.ArgumentParser(
         description="Validate a fit assessment and identify conclusions needing review after release drift."
@@ -44,7 +48,17 @@ def parse_args(argv: list[str] | None = None) -> argparse.Namespace:
         "--catalog", type=Path, help="Read a catalog from a local file."
     )
     parser.add_argument(
-        "--keyring", type=Path, help="Trusted local keyring; required with --catalog."
+        "--keyring",
+        type=Path,
+        help="Published or candidate keyring whose hash is pinned by --catalog.",
+    )
+    parser.add_argument(
+        "--trusted-keyring",
+        type=Path,
+        help=(
+            "Independently pinned local keyring used as the catalog signature trust "
+            f"root; defaults to ${TRUSTED_KEYRING_FILE_ENV}."
+        ),
     )
     parser.add_argument(
         "--workspace-root",
@@ -74,7 +88,14 @@ def main(argv: list[str] | None = None) -> int:
         raise SystemExit("--keyring is required with --catalog")
     if args.public and args.keyring is not None:
         raise SystemExit("--keyring cannot be combined with --public")
-
+    configured_trusted_keyring = os.getenv(TRUSTED_KEYRING_FILE_ENV, "").strip()
+    trusted_keyring_path = args.trusted_keyring or (
+        Path(configured_trusted_keyring) if configured_trusted_keyring else None
+    )
+    if trusted_keyring_path is None:
+        raise SystemExit(
+            f"--trusted-keyring or ${TRUSTED_KEYRING_FILE_ENV} is required"
+        )
     assessment = read_object(args.assessment, label="assessment")
     schema = read_object(args.schema, label="schema")
     if args.public:
@@ -82,18 +103,24 @@ def main(argv: list[str] | None = None) -> int:
             f"{DEFAULT_PUBLIC_BASE_URL}/catalogs/v1/channels/stable.json",
             label="catalog",
         )
-        keyring = fetch_public_json(
+        published_keyring = fetch_public_json(
-            f"{DEFAULT_PUBLIC_BASE_URL}/catalogs/v1/keyring.json", label="keyring"
+            f"{DEFAULT_PUBLIC_BASE_URL}/catalogs/v1/keyring.json",
+            label="published keyring",
         )
     else:
         catalog = read_object(args.catalog, label="catalog")
-        keyring = read_object(args.keyring, label="keyring")
+        published_keyring = read_object(args.keyring, label="published keyring")
+    trusted_keyring = read_object(
+        trusted_keyring_path,
+        label="trusted keyring",
+    )
 
     report = review_capability_fit(
         assessment=assessment,
         schema=schema,
         catalog=catalog,
-        keyring=keyring,
+        published_keyring=published_keyring,
+        trusted_keyring=trusted_keyring,
         workspace_root=None
         if args.skip_tag_provenance
         else args.workspace_root.resolve(),

tools/assessments/govoplan_assessment/capability_fit.py

@@ -46,7 +46,8 @@ def review_capability_fit(
     assessment: dict[str, Any],
     schema: dict[str, Any],
     catalog: dict[str, Any],
-    keyring: dict[str, Any],
+    published_keyring: dict[str, Any],
+    trusted_keyring: dict[str, Any],
     workspace_root: Path | None = None,
 ) -> dict[str, Any]:
     """Return a secret-free release-drift report for one fit assessment."""
@@ -64,10 +65,15 @@ def review_capability_fit(
             changes=[],
             review_targets=[],
             catalog_checked=False,
-            local_tag_provenance_checked=False,
+            local_tag_provenance_attempted=0,
+            local_tag_provenance_expected=0,
+            local_tag_catalog_scope_complete=False,
         )
 
-    catalog_validation = validate_catalog(catalog=catalog, keyring=keyring)
+    catalog_validation = validate_catalog(
+        catalog=catalog,
+        trusted_keyring=trusted_keyring,
+    )
     if catalog_validation.get("valid") is not True:
         findings.append(
             Finding(
@@ -100,13 +106,13 @@ def review_capability_fit(
         for issue in source_selection.issues
     )
     expected_keyring_hash = _catalog_keyring_hash(catalog)
-    actual_keyring_hash = canonical_hash(keyring)
+    actual_keyring_hash = canonical_hash(published_keyring)
     if expected_keyring_hash is None:
         findings.append(
             Finding(
                 "blocker",
                 "catalog_keyring_hash_missing",
-                "Catalog release metadata does not pin the trusted keyring hash.",
+                "Catalog release metadata does not pin the published keyring hash.",
                 ("assessment.release",),
             )
         )
@@ -115,7 +121,7 @@ def review_capability_fit(
             Finding(
                 "blocker",
                 "catalog_keyring_hash_mismatch",
-                "The supplied keyring does not match the hash pinned by the catalog.",
+                "The published keyring does not match the hash pinned by the catalog.",
                 ("assessment.release",),
             )
         )
@@ -163,13 +169,58 @@ def review_capability_fit(
     changes: list[dict[str, Any]] = []
     changed_repositories: set[str] = set()
     assessed_module_ids: set[str] = set()
+    composition = assessment["composition"]
+    local_tag_provenance_expected = len(composition)
+    local_tag_provenance_attempted = 0
+    local_tag_catalog_scope_complete = True
 
-    for module in assessment["composition"]:
+    for module in composition:
         module_id = str(module["module_id"])
         repository = str(module["repository"])
+        assessed_version = str(module["manifest_version"])
+        selected_version = source_selection.selected_versions.get(repository)
+        selected_commit = source_selection.selected_commits.get(repository)
+        selected_tag_object = source_selection.selected_tag_objects.get(repository)
         assessed_module_ids.add(module_id)
+        if workspace_root is not None:
+            local_tag_provenance_attempted += 1
+            provenance = local_tag_provenance(
+                workspace_root=workspace_root,
+                repository=repository,
+                version=assessed_version,
+                assessed_commit=str(module["commit"]),
+                selected_commit=(
+                    selected_commit if selected_version == assessed_version else None
+                ),
+                selected_tag_object=(
+                    selected_tag_object
+                    if selected_version == assessed_version
+                    else None
+                ),
+            )
+            if provenance is not None:
+                changes.append(
+                    {
+                        "module_id": module_id,
+                        "repository": repository,
+                        "kind": provenance["kind"],
+                        "assessed_commit": module["commit"],
+                        "tag_commit": provenance.get("tag_commit"),
+                        "tag_object": provenance.get("tag_object"),
+                    }
+                )
+                changed_repositories.add(repository)
+                findings.append(
+                    Finding(
+                        "review",
+                        "tag_provenance_changed",
+                        str(provenance["message"]),
+                        (f"composition.{module_id}",),
+                    )
+                )
         entry = catalog_entries.get(module_id)
         if entry is None:
+            local_tag_catalog_scope_complete = False
             changes.append(
                 {
                     "module_id": module_id,
@@ -211,7 +262,6 @@ def review_capability_fit(
                 )
             )
 
-        assessed_version = str(module["manifest_version"])
         catalog_version = entry["version"]
         if assessed_version != catalog_version:
             changes.append(
@@ -233,8 +283,6 @@ def review_capability_fit(
                 )
             )
 
-        selected_version = source_selection.selected_versions.get(repository)
-        selected_commit = source_selection.selected_commits.get(repository)
         assessed_commit = str(module["commit"]).lower()
         if (
             selected_version == assessed_version
@@ -280,33 +328,6 @@ def review_capability_fit(
                 )
             )
 
-        if workspace_root is not None:
-            provenance = local_tag_provenance(
-                workspace_root=workspace_root,
-                repository=repository,
-                version=assessed_version,
-                assessed_commit=str(module["commit"]),
-            )
-            if provenance is not None:
-                changes.append(
-                    {
-                        "module_id": module_id,
-                        "repository": repository,
-                        "kind": provenance["kind"],
-                        "assessed_commit": module["commit"],
-                        "tag_commit": provenance.get("tag_commit"),
-                    }
-                )
-                changed_repositories.add(repository)
-                findings.append(
-                    Finding(
-                        "review",
-                        "tag_provenance_changed",
-                        str(provenance["message"]),
-                        (f"composition.{module_id}",),
-                    )
-                )
-
     extras = sorted(set(catalog_entries) - assessed_module_ids)
     if extras:
         findings.append(
@@ -331,7 +352,9 @@ def review_capability_fit(
         changes=changes,
         review_targets=review_targets,
         catalog_checked=True,
-        local_tag_provenance_checked=workspace_root is not None,
+        local_tag_provenance_attempted=local_tag_provenance_attempted,
+        local_tag_provenance_expected=local_tag_provenance_expected,
+        local_tag_catalog_scope_complete=local_tag_catalog_scope_complete,
     )
 
 
@@ -357,9 +380,9 @@ def validate_assessment(
 
 
 def validate_catalog(
-    *, catalog: dict[str, Any], keyring: dict[str, Any]
+    *, catalog: dict[str, Any], trusted_keyring: dict[str, Any]
 ) -> dict[str, object]:
-    trusted_keys = trusted_keys_from_keyring(keyring)
+    trusted_keys = trusted_keys_from_keyring(trusted_keyring)
     channel = _text(catalog.get("channel"))
     with tempfile.NamedTemporaryFile(
         mode="w", suffix=".json", encoding="utf-8"
@@ -394,11 +417,19 @@ def trusted_keys_from_keyring(payload: dict[str, Any]) -> dict[str, str]:
     result: dict[str, str] = {}
     keys = payload.get("keys")
     if not isinstance(keys, list):
-        return result
+        return {
+            str(key): str(value)
+            for key, value in payload.items()
+            if str(key).strip() and str(value).strip()
+        }
     for item in keys:
         if not isinstance(item, dict):
             continue
-        if str(item.get("status") or "active").strip().lower() != "active":
+        if str(item.get("status") or "active").strip().lower() in {
+            "revoked",
+            "disabled",
+            "retired",
+        }:
             continue
         raw_not_before = item.get("not_before")
         raw_not_after = item.get("not_after")
@@ -497,6 +528,8 @@ def local_tag_provenance(
     repository: str,
     version: str,
     assessed_commit: str,
+    selected_commit: str | None = None,
+    selected_tag_object: str | None = None,
 ) -> dict[str, str] | None:
     if REPOSITORY_ID_PATTERN.fullmatch(repository) is None:
         return {
@@ -535,6 +568,19 @@ def local_tag_provenance(
             capture_output=True,
             text=True,
         )
+        tag_object_result = subprocess.run(
+            [
+                "git",
+                "-C",
+                str(repo),
+                "rev-parse",
+                "--verify",
+                f"refs/tags/v{version}",
+            ],
+            check=False,
+            capture_output=True,
+            text=True,
+        )
     except OSError:
         return {
             "kind": "tag_provenance_unavailable",
@@ -555,13 +601,40 @@ def local_tag_provenance(
             "kind": "tag_provenance_unavailable",
             "message": f"Cannot peel {repository} tag v{version} in the local checkout.",
         }
+    if tag_object_result.returncode != 0:
+        return {
+            "kind": "tag_provenance_unavailable",
+            "message": f"Cannot resolve {repository} tag object v{version} in the local checkout.",
+        }
     tag_commit = result.stdout.strip().lower()
+    tag_object = tag_object_result.stdout.strip().lower()
     if not tag_commit.startswith(assessed_commit.lower()):
         return {
             "kind": "tag_commit_changed",
             "message": f"{repository} v{version} peels to {tag_commit[:12]}, not assessed commit {assessed_commit}.",
             "tag_commit": tag_commit,
         }
+    if selected_commit is not None and tag_commit != selected_commit.lower():
+        return {
+            "kind": "tag_signed_commit_changed",
+            "message": (
+                f"{repository} v{version} peels to {tag_commit[:12]}, not signed "
+                f"selected-unit commit {selected_commit[:12]}."
+            ),
+            "tag_commit": tag_commit,
+            "tag_object": tag_object,
+        }
+    if selected_tag_object is not None and tag_object != selected_tag_object.lower():
+        return {
+            "kind": "tag_object_changed",
+            "message": (
+                f"{repository} v{version} resolves to annotated tag object "
+                f"{tag_object[:12]}, not signed selected-unit tag object "
+                f"{selected_tag_object[:12]}."
+            ),
+            "tag_commit": tag_commit,
+            "tag_object": tag_object,
+        }
     return None
 
 
@@ -627,7 +700,9 @@ def build_report(
     changes: list[dict[str, Any]],
     review_targets: list[dict[str, Any]],
     catalog_checked: bool,
-    local_tag_provenance_checked: bool,
+    local_tag_provenance_attempted: int,
+    local_tag_provenance_expected: int,
+    local_tag_catalog_scope_complete: bool,
 ) -> dict[str, Any]:
     finding_list = sorted(
         findings,
@@ -635,18 +710,24 @@ def build_report(
     )
     finding_codes = {item.code for item in finding_list}
     schema_valid = "assessment_schema" not in finding_codes
-    catalog_valid = catalog_checked and not finding_codes.intersection(
+    trusted_signature_valid = catalog_checked and "catalog_trust" not in finding_codes
+    published_keyring_valid = catalog_checked and not finding_codes.intersection(
         {
-            "catalog_trust",
             "catalog_keyring_hash_missing",
             "catalog_keyring_hash_mismatch",
         }
     )
+    catalog_valid = trusted_signature_valid and published_keyring_valid
     release_valid = catalog_valid and not any(
         item.severity in {"blocker", "review"} for item in finding_list
     )
+    tag_provenance_checked = (
+        local_tag_provenance_expected > 0
+        and local_tag_provenance_attempted == local_tag_provenance_expected
+        and local_tag_catalog_scope_complete
+    )
     tag_provenance_valid = (
-        local_tag_provenance_checked and "tag_provenance_changed" not in finding_codes
+        tag_provenance_checked and "tag_provenance_changed" not in finding_codes
     )
     if any(item.severity == "blocker" for item in finding_list):
         status = "blocked"
@@ -672,13 +753,23 @@ def build_report(
                 "checked": catalog_checked,
                 "valid": catalog_valid if catalog_checked else None,
             },
+            "catalog_signature_and_trusted_keyring": {
+                "checked": catalog_checked,
+                "valid": trusted_signature_valid if catalog_checked else None,
+            },
+            "published_keyring_hash": {
+                "checked": catalog_checked,
+                "valid": published_keyring_valid if catalog_checked else None,
+            },
             "release_metadata": {
                 "checked": catalog_checked,
                 "valid": release_valid if catalog_checked else None,
             },
             "local_tag_provenance": {
-                "checked": local_tag_provenance_checked,
+                "checked": tag_provenance_checked,
-                "valid": tag_provenance_valid if local_tag_provenance_checked else None,
+                "valid": tag_provenance_valid if tag_provenance_checked else None,
+                "attempted_count": local_tag_provenance_attempted,
+                "expected_count": local_tag_provenance_expected,
             },
             "installed_artifacts": {"checked": False, "valid": None},
             "target_environment": {"checked": False, "valid": None},

tools/release/govoplan_release/catalog.py

@@ -7,11 +7,12 @@ import json
 from pathlib import Path
 from urllib.error import HTTPError, URLError
 
-from .http_fetch import fetch_http
+from .http_fetch import DEFAULT_MAX_RESPONSE_BYTES, fetch_http
 from .model import CatalogSnapshot
 from .workspace import website_root
 
 DEFAULT_PUBLIC_BASE_URL = "https://govoplan.add-ideas.de"
+MAX_PUBLIC_JSON_RESPONSE_BYTES = DEFAULT_MAX_RESPONSE_BYTES
 
 
 def collect_catalog_snapshot(
@@ -22,9 +23,13 @@ def collect_catalog_snapshot(
     check_public: bool = False,
 ) -> CatalogSnapshot:
     web_root = website_root(workspace_root)
-    catalog_path = web_root / "public" / "catalogs" / "v1" / "channels" / f"{channel}.json"
+    catalog_path = (
+        web_root / "public" / "catalogs" / "v1" / "channels" / f"{channel}.json"
+    )
     keyring_path = web_root / "public" / "catalogs" / "v1" / "keyring.json"
-    public_catalog_url = f"{public_base_url.rstrip('/')}/catalogs/v1/channels/{channel}.json"
+    public_catalog_url = (
+        f"{public_base_url.rstrip('/')}/catalogs/v1/channels/{channel}.json"
+    )
     public_keyring_url = f"{public_base_url.rstrip('/')}/catalogs/v1/keyring.json"
 
     catalog_version: str | None = None
@@ -129,8 +134,12 @@ def collect_catalog_snapshot(
         public_keyring_hash=public_keyring_hash,
         public_catalog_error=public_catalog_error,
         public_keyring_error=public_keyring_error,
-        catalog_matches_public=compare_hashes(local_catalog_hash, public_catalog_hash) if check_public else None,
+        catalog_matches_public=compare_hashes(local_catalog_hash, public_catalog_hash)
-        keyring_matches_public=compare_hashes(local_keyring_hash, public_keyring_hash) if check_public else None,
+        if check_public
+        else None,
+        keyring_matches_public=compare_hashes(local_keyring_hash, public_keyring_hash)
+        if check_public
+        else None,
     )
 
 
@@ -149,7 +158,9 @@ def parse_catalog_payload(payload: object) -> dict[str, str | int | None]:
     signatures = payload.get("signatures")
     return {
         "catalog_version": string_or_none(payload.get("catalog_version")),
-        "core_release_version": string_or_none(core_release.get("version")) if isinstance(core_release, dict) else None,
+        "core_release_version": string_or_none(core_release.get("version"))
+        if isinstance(core_release, dict)
+        else None,
         "module_count": len(modules) if isinstance(modules, list) else 0,
         "signature_count": len(signatures) if isinstance(signatures, list) else 0,
         "generated_at": string_or_none(payload.get("generated_at")),
@@ -164,6 +175,7 @@ def fetch_json(url: str) -> dict[str, object]:
             timeout=10,
             label="Public release catalog URL",
             headers={"User-Agent": "GovOPlaN release-console"},
+            max_response_bytes=MAX_PUBLIC_JSON_RESPONSE_BYTES,
         )
         return {"ok": True, "payload": json.loads(response.text())}
     except (HTTPError, URLError, TimeoutError, ValueError, json.JSONDecodeError) as exc:
@@ -171,7 +183,9 @@ def fetch_json(url: str) -> dict[str, object]:
 
 
 def canonical_hash(payload: object) -> str:
-    canonical = json.dumps(payload, sort_keys=True, separators=(",", ":"), ensure_ascii=True).encode("utf-8")
+    canonical = json.dumps(
+        payload, sort_keys=True, separators=(",", ":"), ensure_ascii=True
+    ).encode("utf-8")
     return hashlib.sha256(canonical).hexdigest()
 
 

tools/release/govoplan_release/http_fetch.py

@@ -8,6 +8,9 @@ from dataclasses import dataclass
 from typing import Mapping
 
 
+DEFAULT_MAX_RESPONSE_BYTES = 16 * 1024 * 1024
+
+
 @dataclass(frozen=True, slots=True)
 class HttpFetchResponse:
     status: int
@@ -34,11 +37,29 @@ def fetch_http(
     label: str = "URL",
     method: str = "GET",
     headers: Mapping[str, str] | None = None,
+    max_response_bytes: int = DEFAULT_MAX_RESPONSE_BYTES,
 ) -> HttpFetchResponse:
-    request = urllib.request.Request(validate_http_url(url, label=label), headers=dict(headers or {}), method=method)
+    if max_response_bytes <= 0:
+        raise ValueError("max_response_bytes must be positive.")
+    request = urllib.request.Request(
+        validate_http_url(url, label=label),
+        headers=dict(headers or {}),
+        method=method,
+    )
     with urllib.request.urlopen(request, timeout=timeout) as response:  # noqa: S310 - URL is validated by validate_http_url.  # nosec B310  # nosemgrep: python.lang.security.audit.dynamic-urllib-use-detected.dynamic-urllib-use-detected
+        raw_length = response.headers.get("Content-Length")
+        if raw_length is not None:
+            try:
+                declared_length = int(raw_length)
+            except (TypeError, ValueError):
+                declared_length = None
+            if declared_length is not None and declared_length > max_response_bytes:
+                raise ValueError(f"{label} response exceeds the configured size limit.")
+        body = response.read(max_response_bytes + 1)
+        if len(body) > max_response_bytes:
+            raise ValueError(f"{label} response exceeds the configured size limit.")
         return HttpFetchResponse(
             status=int(getattr(response, "status", 0)),
             headers=dict(response.headers.items()),
-            body=response.read(),
+            body=body,
         )