# sovereign_fail_safe_profile.py from __future__ import annotations import json from datetime import datetime, timezone from typing import Any, Dict, List, Optional from sovereign_crypto_seal import SovereignCryptoSeal def _utc_now() -> str: return datetime.now(timezone.utc).isoformat() class SovereignFailSafeProfileBuilder: """ Builds a bank-grade fail-safe / fail-closed posture profile. Purpose: - Describe how Sovereign should behave under internal failure or uncertainty - Make failure handling explicit for technical buyers - Distinguish forbidden fail-open paths from permitted controlled degrade paths """ def __init__(self, sealer: Optional[SovereignCryptoSeal] = None) -> None: self.sealer = sealer or SovereignCryptoSeal() def _failure_modes(self) -> List[Dict[str, Any]]: return [ { "failure_mode": "authority_decision_unavailable", "category": "decision_path", "default_action": "FREEZE", "posture": "fail_closed", "rationale": "If runtime authority cannot produce a trusted decision, execution should not proceed autonomously.", }, { "failure_mode": "audit_chain_write_failure", "category": "evidence_path", "default_action": "FREEZE", "posture": "fail_closed", "rationale": "If evidentiary continuity cannot be preserved, execution should pause rather than proceed without traceability.", }, { "failure_mode": "crypto_seal_failure", "category": "evidence_integrity", "default_action": "FREEZE", "posture": "fail_closed", "rationale": "If cryptographic sealing cannot be produced where required, runtime trust posture should degrade conservatively.", }, { "failure_mode": "freeze_state_lookup_failure", "category": "freeze_lifecycle", "default_action": "FREEZE", "posture": "fail_closed", "rationale": "If freeze state cannot be resolved, ambiguous execution should remain suspended.", }, { "failure_mode": "policy_engine_failure", "category": "policy_path", "default_action": "FREEZE", "posture": "fail_closed", "rationale": "If bank policy evaluation is unavailable, high-risk financial execution should not continue.", }, { "failure_mode": "manifest_verification_failure", "category": "artifact_integrity", "default_action": "BLOCK", "posture": "fail_closed_hard", "rationale": "If artifact integrity is explicitly invalidated, trust should collapse to BLOCK rather than soft suspension.", }, { "failure_mode": "tamper_detected", "category": "integrity", "default_action": "BLOCK", "posture": "fail_closed_hard", "rationale": "Explicit tamper signals should not permit continued autonomous execution.", }, { "failure_mode": "runtime_timeout", "category": "operational", "default_action": "FREEZE", "posture": "timeout_to_freeze", "rationale": "Timeout should degrade to proportional suspension rather than silent allow.", }, { "failure_mode": "configuration_unreadable", "category": "configuration", "default_action": "BLOCK", "posture": "fail_closed_hard", "rationale": "Unreadable or invalid runtime configuration makes authoritative execution unsafe.", }, { "failure_mode": "state_corruption_detected", "category": "state_integrity", "default_action": "BLOCK", "posture": "fail_closed_hard", "rationale": "Corrupted control state invalidates trust assumptions and should terminate autonomous execution permission.", }, ] def _operational_principles(self) -> List[Dict[str, Any]]: return [ { "principle": "no_silent_fail_open", "status": "required", "description": "No critical authority-path failure should silently downgrade to ALLOW.", }, { "principle": "ambiguity_prefers_freeze", "status": "required", "description": "Where uncertainty exists without explicit tamper proof, ambiguity should default to FREEZE.", }, { "principle": "integrity_break_prefers_block", "status": "required", "description": "Where trust or integrity is explicitly broken, posture should collapse to BLOCK.", }, { "principle": "evidence_continuity_required", "status": "required", "description": "Execution without minimum evidentiary continuity is not considered bank-grade safe.", }, { "principle": "manual_recovery_path_required", "status": "required", "description": "Fail-safe states must remain reviewable and recoverable through controlled human workflow where appropriate.", }, ] def build(self) -> Dict[str, Any]: failure_modes = self._failure_modes() principles = self._operational_principles() posture = { "profile_type": "Sovereign Fail-Safe Profile", "generated_at": _utc_now(), "domain": "banking_and_financial_institutions", "default_fail_posture": "fail_closed", "fail_open_policy": "forbidden_for_critical_paths", "ambiguity_policy": "freeze_by_default", "tamper_policy": "block_by_default", "timeout_policy": "freeze_by_default", "manual_override_policy": "controlled_and_audited", "failure_modes": failure_modes, "operational_principles": principles, "summary": { "total_failure_modes": len(failure_modes), "freeze_defaults": sum(1 for x in failure_modes if x["default_action"] == "FREEZE"), "block_defaults": sum(1 for x in failure_modes if x["default_action"] == "BLOCK"), }, "notes": [ "This profile defines intended bank-grade fail-safe posture, not a substitute for environment-specific deployment validation.", "Fail-safe posture should be interpreted together with runtime enforcement, freeze lifecycle, audit-chain continuity, and verifier outputs.", "Critical-path fail-open behavior is treated as unacceptable in this profile.", ], } sealed = self.sealer.seal_object( posture, object_type="fail_safe_profile", metadata={ "domain": "banking", "artifact_class": "fail_safe_profile", }, ) return { "ok": True, "fail_safe_profile": posture, "crypto_seal": sealed["seal"], "sealed": True, } BUILDER = SovereignFailSafeProfileBuilder() def generate_fail_safe_profile() -> Dict[str, Any]: return BUILDER.build() if __name__ == "__main__": out = generate_fail_safe_profile() print(json.dumps(out, indent=2, ensure_ascii=False))