123 lines
4.9 KiB
Python
123 lines
4.9 KiB
Python
"""
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Dependency risk policy snapshot.
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Loads the latest committed, read-only CVE / license / drift severity policy.
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The policy never queries external CVE or license services, installs packages,
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upgrades dependencies, writes lockfiles, builds images, pulls images, pushes
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registries, calls paid APIs, creates shadow/canary traffic, or changes
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production routing.
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"""
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from __future__ import annotations
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import json
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from pathlib import Path
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from typing import Any
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from src.services.snapshot_paths import default_evaluations_dir
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_DEFAULT_EVALUATIONS_DIR = default_evaluations_dir(Path(__file__))
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_SNAPSHOT_PATTERN = "dependency_risk_policy_*.json"
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_SCHEMA_VERSION = "dependency_risk_policy_v1"
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def load_latest_dependency_risk_policy(
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evaluations_dir: Path | None = None,
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) -> dict[str, Any]:
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"""Load the newest committed dependency risk policy snapshot."""
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directory = evaluations_dir or _DEFAULT_EVALUATIONS_DIR
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candidates = sorted(directory.glob(_SNAPSHOT_PATTERN))
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if not candidates:
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raise FileNotFoundError(f"no dependency risk policy snapshots found in {directory}")
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latest = candidates[-1]
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with latest.open(encoding="utf-8") as handle:
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payload = json.load(handle)
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if not isinstance(payload, dict):
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raise ValueError(f"{latest}: expected JSON object")
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_require_schema(payload, _SCHEMA_VERSION, str(latest))
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_require_read_only_boundaries(payload, str(latest))
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_require_operation_boundaries(payload, str(latest))
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_require_rollup_consistency(payload, str(latest))
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return payload
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def _require_schema(payload: dict[str, Any], expected: str, label: str) -> None:
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actual = payload.get("schema_version")
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if actual != expected:
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raise ValueError(f"{label}: expected schema_version={expected}, got {actual!r}")
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def _require_read_only_boundaries(payload: dict[str, Any], label: str) -> None:
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program_status = payload.get("program_status") or {}
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if program_status.get("read_only_mode") is not True:
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raise ValueError(f"{label}: program_status.read_only_mode must be true")
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boundaries = payload.get("approval_boundaries") or {}
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blocked_flags = {
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"sdk_installation_allowed",
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"paid_api_call_allowed",
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"shadow_or_canary_allowed",
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"production_routing_allowed",
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"destructive_operation_allowed",
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}
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allowed = sorted(flag for flag in blocked_flags if boundaries.get(flag) is not False)
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if allowed:
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raise ValueError(f"{label}: approval boundaries must remain false: {allowed}")
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def _require_operation_boundaries(payload: dict[str, Any], label: str) -> None:
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boundaries = payload.get("operation_boundaries") or {}
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if boundaries.get("read_only_policy_allowed") is not True:
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raise ValueError(f"{label}: read_only_policy_allowed must be true")
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blocked_flags = {
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"external_cve_lookup_allowed",
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"external_license_lookup_allowed",
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"package_installation_allowed",
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"package_upgrade_allowed",
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"lockfile_write_allowed",
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"docker_build_allowed",
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"image_pull_allowed",
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"image_rebuild_allowed",
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"registry_push_allowed",
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"paid_api_call_allowed",
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"shadow_or_canary_allowed",
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"production_routing_allowed",
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}
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allowed = sorted(flag for flag in blocked_flags if boundaries.get(flag) is not False)
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if allowed:
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raise ValueError(f"{label}: operation boundaries must remain false: {allowed}")
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def _require_rollup_consistency(payload: dict[str, Any], label: str) -> None:
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rules = payload.get("severity_rules") or []
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rollups = payload.get("rollups") or {}
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total = rollups.get("total_rules")
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if total != len(rules):
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raise ValueError(f"{label}: rollups.total_rules must equal severity_rules length")
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by_severity = rollups.get("by_severity") or {}
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for severity in ("critical", "high", "medium", "low"):
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actual = sum(1 for rule in rules if rule.get("severity") == severity)
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if by_severity.get(severity) != actual:
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raise ValueError(f"{label}: rollups.by_severity.{severity} must match rules")
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by_status = rollups.get("by_status") or {}
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for status in ("accepted", "action_required", "planned_next", "blocked"):
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actual = sum(1 for rule in rules if rule.get("status") == status)
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expected = by_status.get(status, 0)
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if expected != actual:
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raise ValueError(f"{label}: rollups.by_status.{status} must match rules")
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expected_by_status = {
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"action_required": set(rollups.get("action_required_rule_ids") or []),
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"planned_next": set(rollups.get("planned_next_rule_ids") or []),
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"accepted": set(rollups.get("accepted_rule_ids") or []),
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}
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for status, expected_ids in expected_by_status.items():
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actual_ids = {rule.get("rule_id") for rule in rules if rule.get("status") == status}
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if expected_ids != actual_ids:
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raise ValueError(f"{label}: rollups.{status}_rule_ids must match rules")
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