Document production target evidence handoff

2026-08-04 14:00:45 +02:00
parent e36a6573bf
commit be51a9c347
5 changed files with 504 additions and 0 deletions
@@ -0,0 +1,120 @@
+from __future__ import annotations
+
+import base64
+import json
+from pathlib import Path
+import stat
+import subprocess
+import sys
+import tempfile
+import unittest
+
+from cryptography.hazmat.primitives import serialization
+from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
+from jsonschema import Draft202012Validator, FormatChecker
+
+
+META_ROOT = Path(__file__).resolve().parents[1]
+GENERATOR = META_ROOT / "tools" / "assessments" / "generate-authority-keypair.py"
+
+
+class AssessmentAuthorityKeypairTests(unittest.TestCase):
+    def test_generates_schema_valid_scoped_proof_authority(self) -> None:
+        with tempfile.TemporaryDirectory() as temp_dir:
+            output_dir = Path(temp_dir)
+            output_dir.chmod(0o700)
+            private_path = output_dir / "target.pem"
+            keyring_path = output_dir / "target.json"
+
+            result = subprocess.run(
+                (
+                    sys.executable,
+                    str(GENERATOR),
+                    "--purpose",
+                    "proof",
+                    "--key-id",
+                    "authority:target-2026",
+                    "--scope",
+                    "target_environment",
+                    "--scope",
+                    "operations",
+                    "--private-key",
+                    str(private_path),
+                    "--keyring",
+                    str(keyring_path),
+                ),
+                check=False,
+                capture_output=True,
+                text=True,
+            )
+
+            self.assertEqual(0, result.returncode, result.stderr)
+            self.assertEqual(0o600, stat.S_IMODE(private_path.stat().st_mode))
+            self.assertEqual(0o600, stat.S_IMODE(keyring_path.stat().st_mode))
+            keyring = json.loads(keyring_path.read_text(encoding="utf-8"))
+            schema = json.loads(
+                (
+                    META_ROOT
+                    / "docs"
+                    / "capability-fit-proof-authority-keyring.schema.json"
+                ).read_text(encoding="utf-8")
+            )
+            errors = tuple(
+                Draft202012Validator(
+                    schema, format_checker=FormatChecker()
+                ).iter_errors(keyring)
+            )
+            self.assertEqual((), errors)
+            self.assertEqual(
+                ["target_environment", "operations"],
+                keyring["keys"][0]["allowed_scopes"],
+            )
+            private_key = serialization.load_pem_private_key(
+                private_path.read_bytes(), password=None
+            )
+            self.assertIsInstance(private_key, Ed25519PrivateKey)
+            public_key = base64.b64encode(
+                private_key.public_key().public_bytes(
+                    encoding=serialization.Encoding.Raw,
+                    format=serialization.PublicFormat.Raw,
+                )
+            ).decode("ascii")
+            self.assertEqual(public_key, keyring["keys"][0]["public_key"])
+
+    def test_installer_authority_uses_fixed_scope_and_refuses_overwrite(self) -> None:
+        with tempfile.TemporaryDirectory() as temp_dir:
+            output_dir = Path(temp_dir)
+            output_dir.chmod(0o700)
+            private_path = output_dir / "installer.pem"
+            keyring_path = output_dir / "installer.json"
+            command = (
+                sys.executable,
+                str(GENERATOR),
+                "--purpose",
+                "installer",
+                "--key-id",
+                "authority:installer-2026",
+                "--private-key",
+                str(private_path),
+                "--keyring",
+                str(keyring_path),
+            )
+
+            first = subprocess.run(
+                command, check=False, capture_output=True, text=True
+            )
+            second = subprocess.run(
+                command, check=False, capture_output=True, text=True
+            )
+
+            self.assertEqual(0, first.returncode, first.stderr)
+            self.assertNotEqual(0, second.returncode)
+            keyring = json.loads(keyring_path.read_text(encoding="utf-8"))
+            self.assertEqual(
+                ["installed_release_origin"],
+                keyring["keys"][0]["allowed_scopes"],
+            )
+
+
+if __name__ == "__main__":
+    unittest.main()