Harden WP-0024 recovery execution gates

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a02669-87ee-7a31-b111-edc95a16e0fa

scripts/audit-core-database-lease-recovery.py

@@ -0,0 +1,438 @@
+#!/usr/bin/env python3
+"""Attended audit-core database lease failure/recovery exercise.
+
+The script is fail-closed and value-safe.  It selects only a single live lease
+under the exact audit-core runtime prefix, never emits its id, never reads a
+database password, never restarts audit-core, and requires a separately
+approved synthetic-load driver.
+"""
+
+from __future__ import annotations
+
+import argparse
+import hashlib
+import importlib.util
+import json
+import os
+import stat
+import subprocess
+import sys
+import time
+from datetime import UTC, datetime, timedelta
+from pathlib import Path
+from typing import Any, Callable
+
+
+ROOT = Path(__file__).resolve().parents[1]
+TASK_ID = "RAILIANCE-WP-0024-T02"
+PROCEDURE = "audit-core-database-lease-recovery"
+LEASE_PREFIX = "database/creds/audit-core-runtime"
+EXTERNAL_SECRET = "audit-core-database"
+CONFIRM = f"{TASK_ID}:attended"
+MAX_WINDOW_SECONDS = 15 * 60
+MIN_LEASE_TTL_SECONDS = 5 * 60
+EXPECTED_DRIVER_KEYS = {
+    "baseline": {"contract_id", "fixture_id", "status", "secret_values_observed"},
+    "expect-unavailable": {
+        "contract_id", "fixture_id", "status", "http_status", "attempts",
+        "secret_values_observed",
+    },
+    "expect-recovered": {
+        "contract_id", "fixture_id", "status", "http_status", "attempts",
+        "secret_values_observed",
+    },
+    "cleanup": {"contract_id", "fixture_id", "status", "secret_values_observed"},
+}
+
+
+class ProcedureError(RuntimeError):
+    pass
+
+
+def load_preflight_module() -> Any:
+    spec = importlib.util.spec_from_file_location(
+        "audit_core_recovery_preflight",
+        ROOT / "scripts" / "audit-core-recovery-preflight.py",
+    )
+    if not spec or not spec.loader:
+        raise ProcedureError("cannot load recovery preflight module")
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+    return module
+
+
+PREFLIGHT = load_preflight_module()
+
+
+def parse_time(value: str) -> datetime:
+    parsed = datetime.fromisoformat(value.replace("Z", "+00:00"))
+    if parsed.tzinfo is None:
+        raise ProcedureError("approval timestamps must include a timezone")
+    return parsed.astimezone(UTC)
+
+
+def load_approval(path: Path, now: datetime, *, require_open_window: bool) -> dict[str, Any]:
+    try:
+        document = json.loads(path.read_text(encoding="utf-8"))
+    except (OSError, json.JSONDecodeError) as exc:
+        raise ProcedureError("approval receipt is unavailable or invalid JSON") from exc
+    if not isinstance(document, dict):
+        raise ProcedureError("approval receipt must be an object")
+    if document.get("procedure") != PROCEDURE or document.get("task_id") != TASK_ID:
+        raise ProcedureError("approval receipt has the wrong procedure or task")
+    if document.get("status") != "approved" or not document.get("approval_id"):
+        raise ProcedureError("approval receipt is not approved")
+    window = document.get("window") or {}
+    if not window.get("start") or not window.get("end"):
+        raise ProcedureError("approval receipt has no complete window")
+    start, end = parse_time(window["start"]), parse_time(window["end"])
+    if not start < end or (end - start).total_seconds() > MAX_WINDOW_SECONDS:
+        raise ProcedureError("approval window must be positive and at most 15 minutes")
+    if require_open_window and not start <= now <= end:
+        raise ProcedureError("current time is outside the approved window")
+    if not document.get("abort_operator"):
+        raise ProcedureError("approval receipt has no abort operator")
+    owners = document.get("owners") or {}
+    for owner in ("audit-core", "rapp-postgres", "railiance-platform"):
+        record = owners.get(owner) or {}
+        if record.get("acknowledged") is not True or not record.get("message_id"):
+            raise ProcedureError(f"approval receipt lacks {owner} acknowledgement")
+    load = document.get("synthetic_load") or {}
+    if not load.get("contract_id") or not load.get("driver_revision"):
+        raise ProcedureError("approval receipt lacks the synthetic-load contract")
+    return document
+
+
+def safe_run(
+    command: list[str], *, label: str, env: dict[str, str] | None = None
+) -> subprocess.CompletedProcess[str]:
+    completed = subprocess.run(
+        command, text=True, capture_output=True, env=env, check=False
+    )
+    if completed.returncode != 0:
+        # Never attach stdout/stderr: Bao and load-driver processes may hold
+        # sensitive material even though their contract forbids emitting it.
+        raise ProcedureError(f"{label} failed (exit {completed.returncode})")
+    return completed
+
+
+class Authority:
+    def __init__(self, token_file: Path) -> None:
+        if not token_file.is_file() or stat.S_IMODE(token_file.stat().st_mode) != 0o600:
+            raise ProcedureError("OpenBao token file must exist with mode 0600")
+        token = token_file.read_text(encoding="utf-8").splitlines()[0].strip()
+        if not token:
+            raise ProcedureError("OpenBao token file is empty")
+        self.env = dict(os.environ, BAO_ADDR="https://bao.coulomb.social", BAO_TOKEN=token)
+
+    def bao(self, args: list[str], *, label: str) -> str:
+        return safe_run(["bao", *args], label=label, env=self.env).stdout.strip()
+
+    def single_runtime_lease(self) -> dict[str, Any]:
+        raw = self.bao(
+            ["list", "-format=json", f"sys/leases/lookup/{LEASE_PREFIX}"],
+            label="list exact runtime lease handles",
+        )
+        try:
+            handles = json.loads(raw)
+        except json.JSONDecodeError as exc:
+            raise ProcedureError("runtime lease list is invalid JSON") from exc
+        if not isinstance(handles, list) or len(handles) != 1:
+            count = len(handles) if isinstance(handles, list) else "unknown"
+            raise ProcedureError(
+                f"exact runtime prefix must contain one live handle (observed {count})"
+            )
+        lease_id = f"{LEASE_PREFIX}/{handles[0]}"
+        lookup_raw = self.bao(
+            ["write", "-format=json", "sys/leases/lookup", f"lease_id={lease_id}"],
+            label="lookup exact runtime lease metadata",
+        )
+        try:
+            lookup = json.loads(lookup_raw)["data"]
+            issue = parse_time(lookup["issue_time"])
+            expires = parse_time(lookup["expire_time"])
+            ttl = int(lookup["ttl"])
+        except (json.JSONDecodeError, KeyError, TypeError, ValueError) as exc:
+            raise ProcedureError("runtime lease metadata is incomplete") from exc
+        return {
+            "id": lease_id,
+            "fingerprint": hashlib.sha256(lease_id.encode()).hexdigest()[:12],
+            "issue_time": issue,
+            "expire_time": expires,
+            "ttl": ttl,
+        }
+
+    def revoke(self, lease_id: str) -> None:
+        self.bao(["lease", "revoke", lease_id], label="revoke exact runtime lease")
+
+
+class LoadDriver:
+    def __init__(self, path: Path, contract_id: str, expected_revision: str) -> None:
+        if not path.is_file() or not os.access(path, os.X_OK):
+            raise ProcedureError("synthetic-load driver must be an executable file")
+        revision = "sha256:" + hashlib.sha256(path.read_bytes()).hexdigest()
+        if expected_revision != revision:
+            raise ProcedureError("synthetic-load driver does not match the approved revision")
+        self.path = path
+        self.contract_id = contract_id
+        self.revision = revision
+
+    def run(self, phase: str) -> dict[str, Any]:
+        result = safe_run(
+            [str(self.path), phase, "--contract-id", self.contract_id],
+            label=f"synthetic-load {phase}",
+        )
+        try:
+            payload = json.loads(result.stdout)
+        except json.JSONDecodeError as exc:
+            raise ProcedureError(f"synthetic-load {phase} returned invalid JSON") from exc
+        if not isinstance(payload, dict) or set(payload) != EXPECTED_DRIVER_KEYS[phase]:
+            raise ProcedureError(f"synthetic-load {phase} returned an unsafe evidence shape")
+        if payload.get("contract_id") != self.contract_id:
+            raise ProcedureError(f"synthetic-load {phase} returned the wrong contract")
+        if payload.get("secret_values_observed") is not False:
+            raise ProcedureError(f"synthetic-load {phase} did not attest value safety")
+        return payload
+
+
+def secret_state(remote: Any) -> dict[str, Any]:
+    secret_rv = remote.kubectl(
+        ["-n", "audit-core", "get", "secret", EXTERNAL_SECRET, "-o", "jsonpath={.metadata.resourceVersion}"],
+        label="read database Secret resource version",
+    )
+    external = remote.kubectl_json(
+        ["-n", "audit-core", "get", "externalsecret", EXTERNAL_SECRET],
+        label="read database ExternalSecret state",
+    )
+    mount_generation = remote.kubectl(
+        ["-n", "audit-core", "exec", "deploy/audit-core", "--", "readlink", "/etc/audit-core/db/..data"],
+        label="read mounted credential generation",
+    )
+    refresh = external.get("status", {}).get("refreshTime")
+    ready = PREFLIGHT.resource_condition(external)["ready"]
+    if not refresh:
+        raise ProcedureError("database ExternalSecret has no refresh time")
+    return {
+        "resource_version": secret_rv,
+        "mount_generation": mount_generation,
+        "refresh_time": parse_time(refresh),
+        "ready": ready,
+    }
+
+
+def pod_state(remote: Any) -> dict[str, Any]:
+    pods = remote.kubectl_json(
+        ["-n", "audit-core", "get", "pods", "-l", "app.kubernetes.io/name=audit-core"],
+        label="read audit-core pod metadata",
+    ).get("items", [])
+    if len(pods) != 1:
+        raise ProcedureError(f"expected one audit-core pod, observed {len(pods)}")
+    statuses = pods[0].get("status", {}).get("containerStatuses", [])
+    return {
+        "uid": pods[0]["metadata"]["uid"],
+        "restart_count": sum(int(item.get("restartCount", 0)) for item in statuses),
+    }
+
+
+def assert_lease_matches_refresh(lease: dict[str, Any], secret: dict[str, Any]) -> None:
+    delta = abs((lease["issue_time"] - secret["refresh_time"]).total_seconds())
+    if (
+        delta > 5
+        or secret["refresh_time"] < lease["issue_time"] - timedelta(seconds=5)
+        or secret["refresh_time"] > lease["expire_time"]
+    ):
+        raise ProcedureError("single runtime lease is not coherent with the mounted Secret refresh")
+    if lease["ttl"] < MIN_LEASE_TTL_SECONDS:
+        raise ProcedureError("runtime lease is too close to automatic refresh; wait for the next sync")
+
+
+def wait_for(
+    predicate: Callable[[], bool], *, label: str, timeout: int = 120, interval: float = 2
+) -> None:
+    deadline = time.monotonic() + timeout
+    while time.monotonic() < deadline:
+        if predicate():
+            return
+        time.sleep(interval)
+    raise ProcedureError(f"timed out waiting for {label}")
+
+
+def force_refresh(remote: Any, baseline: dict[str, Any]) -> dict[str, Any]:
+    remote.kubectl(
+        [
+            "-n", "audit-core", "annotate", "externalsecret", EXTERNAL_SECRET,
+            f"railiance.io/force-sync={int(time.time())}", "--overwrite",
+        ],
+        label="force database ExternalSecret reconciliation",
+    )
+    latest: dict[str, Any] = {}
+
+    def changed() -> bool:
+        nonlocal latest
+        latest = secret_state(remote)
+        return bool(
+            latest["ready"]
+            and latest["resource_version"] != baseline["resource_version"]
+            and latest["mount_generation"] != baseline["mount_generation"]
+            and latest["refresh_time"] > baseline["refresh_time"]
+        )
+
+    wait_for(changed, label="database Secret and mounted generation refresh")
+    return latest
+
+
+def exercise(args: argparse.Namespace) -> dict[str, Any]:
+    approval = load_approval(args.approval, datetime.now(UTC), require_open_window=True)
+    if args.confirm != CONFIRM:
+        raise ProcedureError(f"live exercise requires --confirm {CONFIRM}")
+    remote = PREFLIGHT.Remote(args.remote)
+    authority = Authority(args.token_file)
+    driver = LoadDriver(
+        args.load_driver,
+        approval["synthetic_load"]["contract_id"],
+        approval["synthetic_load"]["driver_revision"],
+    )
+
+    preflight_args = argparse.Namespace(
+        approved_window_id=approval["approval_id"],
+        audit_core_owner_ack=True,
+        rapp_postgres_owner_ack=True,
+        synthetic_load_id=approval["synthetic_load"]["contract_id"],
+        abort_operator=approval["abort_operator"],
+    )
+    preflight = PREFLIGHT.database_lease_preflight(remote, preflight_args)
+    if not preflight["ready_for_live_execution"]:
+        raise ProcedureError("database lease recovery preflight is not ready")
+
+    before_pod = pod_state(remote)
+    before_secret = secret_state(remote)
+    lease = authority.single_runtime_lease()
+    assert_lease_matches_refresh(lease, before_secret)
+    baseline_load = driver.run("baseline")
+    if baseline_load.get("status") != "ready":
+        raise ProcedureError("synthetic-load baseline is not ready")
+    revoked = False
+    recovered_secret: dict[str, Any] | None = None
+    unavailable: dict[str, Any] | None = None
+    recovered: dict[str, Any] | None = None
+    cleanup_result: dict[str, Any] | None = None
+    completed = False
+    try:
+        # Close the race with ESO's ordinary refresh before the destructive step.
+        if secret_state(remote) != before_secret or pod_state(remote) != before_pod:
+            raise ProcedureError("baseline changed before revocation")
+        current = authority.single_runtime_lease()
+        if current["fingerprint"] != lease["fingerprint"]:
+            raise ProcedureError("runtime lease changed before revocation")
+        authority.revoke(lease["id"])
+        revoked = True
+        wait_for(
+            lambda: PREFLIGHT.endpoint_status(remote, "/healthz") == 200
+            and PREFLIGHT.endpoint_status(remote, "/readyz") == 503,
+            label="health 200 and readiness 503 after revocation",
+            timeout=60,
+        )
+        unavailable = driver.run("expect-unavailable")
+        if (
+            unavailable.get("http_status") != 503
+            or unavailable.get("status") != "retryable_unavailable"
+            or not isinstance(unavailable.get("attempts"), int)
+            or unavailable["attempts"] < 1
+            or unavailable.get("fixture_id") != baseline_load.get("fixture_id")
+        ):
+            raise ProcedureError("synthetic load did not prove retryable 503")
+        recovered_secret = force_refresh(remote, before_secret)
+        wait_for(
+            lambda: PREFLIGHT.endpoint_status(remote, "/readyz") == 200,
+            label="audit-core readiness recovery",
+        )
+        recovered = driver.run("expect-recovered")
+        if (
+            recovered.get("status") not in {"accepted", "duplicate"}
+            or recovered.get("http_status") not in {200, 202}
+            or recovered.get("fixture_id") != baseline_load.get("fixture_id")
+        ):
+            raise ProcedureError("synthetic load did not prove accepted/duplicate recovery")
+        after_pod = pod_state(remote)
+        if after_pod != before_pod:
+            raise ProcedureError("audit-core pod identity or restart count changed")
+        completed = True
+    finally:
+        if revoked and recovered_secret is None:
+            try:
+                force_refresh(remote, before_secret)
+            except Exception:
+                pass
+        try:
+            cleanup_result = driver.run("cleanup")
+            if (
+                cleanup_result.get("status") != "clean"
+                or cleanup_result.get("fixture_id") != baseline_load.get("fixture_id")
+            ):
+                raise ProcedureError("synthetic-load cleanup did not confirm exact fixture removal")
+        except Exception:
+            if completed:
+                raise
+    return {
+        "procedure": PROCEDURE,
+        "task_id": TASK_ID,
+        "approval_id": approval["approval_id"],
+        "synthetic_load_contract": approval["synthetic_load"]["contract_id"],
+        "synthetic_load_driver_revision": driver.revision,
+        "lease_handle_fingerprint": lease["fingerprint"],
+        "lease_revoked": revoked,
+        "health_during_failure": 200,
+        "readiness_during_failure": 503,
+        "synthetic_unavailable_attempts": unavailable["attempts"] if unavailable else None,
+        "secret_resource_version_changed": bool(
+            recovered_secret
+            and recovered_secret["resource_version"] != before_secret["resource_version"]
+        ),
+        "mount_generation_changed": bool(
+            recovered_secret
+            and recovered_secret["mount_generation"] != before_secret["mount_generation"]
+        ),
+        "readiness_recovered": PREFLIGHT.endpoint_status(remote, "/readyz") == 200,
+        "synthetic_recovery_status": recovered["status"] if recovered else None,
+        "same_pod_uid": pod_state(remote)["uid"] == before_pod["uid"],
+        "restart_count_unchanged": pod_state(remote)["restart_count"] == before_pod["restart_count"],
+        "load_cleanup_status": cleanup_result["status"] if cleanup_result else None,
+        "completed_at": datetime.now(UTC).replace(microsecond=0).isoformat().replace("+00:00", "Z"),
+        "secret_values_observed": False,
+    }
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("command", choices=["validate-approval", "exercise"])
+    parser.add_argument("--approval", type=Path, required=True)
+    parser.add_argument("--remote", default="railiance01")
+    parser.add_argument(
+        "--token-file", type=Path,
+        default=Path.home() / ".local/openbao/platform-admin.token",
+    )
+    parser.add_argument("--load-driver", type=Path)
+    parser.add_argument("--confirm")
+    args = parser.parse_args()
+    try:
+        if args.command == "validate-approval":
+            approval = load_approval(args.approval, datetime.now(UTC), require_open_window=False)
+            result = {
+                "procedure": PROCEDURE,
+                "approval_id": approval["approval_id"],
+                "approval_receipt_valid": True,
+                "secret_values_observed": False,
+            }
+        else:
+            if args.load_driver is None:
+                raise ProcedureError("live exercise requires --load-driver")
+            result = exercise(args)
+    except (OSError, IndexError, ProcedureError, PREFLIGHT.PreflightError) as exc:
+        print(f"database lease recovery failed: {exc}", file=sys.stderr)
+        return 1
+    print(json.dumps(result, indent=2, sort_keys=True))
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())