tegwick
5fd04e2095
Accept now extends a single-schema chain. Verify walks it; a rewritten payload_hash is a break. Tamper evidence is that detector plus an external chain-head attestation, not WORM.
139 lines
4.6 KiB
Python
139 lines
4.6 KiB
Python
import json
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from audit_core.ingestion import IngestionApplication
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from audit_core.integrity import GENESIS, chain_link, load_attestation, write_attestation
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from audit_core.interface import AuditEvent
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from audit_core.sqlite_backend import SQLiteAuditBackend
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from test_ingestion import invoke
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def _event(event_id: str, **kw) -> AuditEvent:
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fields = dict(
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event_id=event_id,
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source="user-engine",
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action="membership.added",
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resource="membership-1",
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outcome="recorded",
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tenant="tenant:friendly:binky",
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scope="tenant",
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details={"correlation_id": "corr-1"},
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observed_at="2026-08-09T00:00:00+00:00",
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)
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fields.update(kw)
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return AuditEvent(**fields)
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def _digest(event: AuditEvent) -> str:
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import hashlib
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return hashlib.sha256(
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json.dumps(event.as_record(), sort_keys=True).encode()
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).hexdigest()
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def test_first_accept_sets_genesis(tmp_path):
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backend = SQLiteAuditBackend(str(tmp_path / "c.db"))
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event = _event("e1")
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backend.accept(event, _digest(event))
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row = backend.db.execute(
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"SELECT chain_prev, chain_hash FROM events WHERE event_id = 'e1'"
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).fetchone()
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assert row[0] == GENESIS
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assert row[1] == chain_link(GENESIS, _digest(event), "e1")
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def test_second_accept_links(tmp_path):
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backend = SQLiteAuditBackend(str(tmp_path / "c.db"))
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first = _event("e1")
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second = _event("e2")
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backend.accept(first, _digest(first))
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backend.accept(second, _digest(second))
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head = backend.db.execute(
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"SELECT chain_hash FROM events WHERE event_id = 'e1'"
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).fetchone()[0]
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prev = backend.db.execute(
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"SELECT chain_prev FROM events WHERE event_id = 'e2'"
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).fetchone()[0]
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assert prev == head
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def test_duplicate_does_not_fork(tmp_path):
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backend = SQLiteAuditBackend(str(tmp_path / "c.db"))
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event = _event("e1")
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digest = _digest(event)
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assert backend.accept(event, digest).duplicate is False
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assert backend.accept(event, digest).duplicate is True
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count = backend.db.execute("SELECT count(*) FROM events").fetchone()[0]
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assert count == 1
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assert backend.verify_chain().events == 1
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def test_verify_clean_on_fresh_store(tmp_path):
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backend = SQLiteAuditBackend(str(tmp_path / "c.db"))
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empty = backend.verify_chain()
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assert empty.intact is True
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assert empty.events == 0
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assert empty.head == GENESIS
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first = _event("e1")
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second = _event("e2")
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backend.accept(first, _digest(first))
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backend.accept(second, _digest(second))
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report = backend.verify_chain()
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assert report.intact is True
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assert report.events == 2
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assert report.first_break is None
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def test_rewritten_payload_fails_verify(tmp_path):
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backend = SQLiteAuditBackend(str(tmp_path / "c.db"))
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first = _event("e1")
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second = _event("e2")
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backend.accept(first, _digest(first))
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backend.accept(second, _digest(second))
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backend.db.execute("UPDATE events SET payload_hash = 'deadbeef' WHERE event_id = 'e2'")
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report = backend.verify_chain()
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assert report.intact is False
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assert report.first_break == "e2"
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def test_attestation_mismatch(tmp_path):
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backend = SQLiteAuditBackend(str(tmp_path / "c.db"))
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event = _event("e1")
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backend.accept(event, _digest(event))
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path = tmp_path / "head.json"
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write_attestation(path, backend.verify_chain())
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cited = load_attestation(path)
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assert backend.verify_chain(cited).attestation_match is True
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cited["chain_hash"] = "f" * 64
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broken = backend.verify_chain(cited)
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assert broken.intact is False
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assert broken.first_break == "attestation_mismatch"
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assert broken.attestation_match is False
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def test_attestation_still_matches_after_growth(tmp_path):
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backend = SQLiteAuditBackend(str(tmp_path / "c.db"))
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first = _event("e1")
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backend.accept(first, _digest(first))
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cited = backend.attest_chain()
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second = _event("e2")
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backend.accept(second, _digest(second))
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report = backend.verify_chain(cited)
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assert report.intact is True
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assert report.attestation_match is True
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assert report.events == 2
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def test_http_integrity_requires_read(tmp_path):
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backend = SQLiteAuditBackend(str(tmp_path / "c.db"))
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app = IngestionApplication(backend, "opaque")
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status, _ = invoke(app, None, path="/v1/integrity", method="GET", body=b"")
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assert status.startswith("200")
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event = _event("e1")
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backend.accept(event, _digest(event))
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status, body = invoke(app, None, path="/v1/integrity", method="GET", body=b"")
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assert status.startswith("200")
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assert body["intact"] is True
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assert body["events"] == 1
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assert "record" not in body
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