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| 1 | +"""H4 governance shadow wiring (WDA-002 / WDA-003). |
| 2 | +
|
| 3 | +Connects the policy engine and RBAC modules to production entry paths in |
| 4 | +shadow mode by default. RBAC may be switched to enforce via |
| 5 | +``TEAAGENT_H4_RBAC_MODE=enforce``. |
| 6 | +""" |
| 7 | + |
| 8 | +from __future__ import annotations |
| 9 | + |
| 10 | +import os |
| 11 | +from enum import Enum |
| 12 | +from pathlib import Path |
| 13 | +from typing import Any, Optional |
| 14 | + |
| 15 | +from teaagent.policy_engine import PolicyEffect, PolicyEngine, PolicyStore, PolicyType |
| 16 | + |
| 17 | + |
| 18 | +class H4GovernanceMode(str, Enum): |
| 19 | + SHADOW = 'shadow' |
| 20 | + ENFORCE = 'enforce' |
| 21 | + |
| 22 | + |
| 23 | +def _mode_from_env(var_name: str, *, default: H4GovernanceMode) -> H4GovernanceMode: |
| 24 | + raw = os.environ.get(var_name, default.value).strip().lower() |
| 25 | + if raw in {m.value for m in H4GovernanceMode}: |
| 26 | + return H4GovernanceMode(raw) |
| 27 | + return default |
| 28 | + |
| 29 | + |
| 30 | +def policy_governance_mode() -> H4GovernanceMode: |
| 31 | + return _mode_from_env('TEAAGENT_H4_POLICY_MODE', default=H4GovernanceMode.SHADOW) |
| 32 | + |
| 33 | + |
| 34 | +def rbac_governance_mode() -> H4GovernanceMode: |
| 35 | + return _mode_from_env('TEAAGENT_H4_RBAC_MODE', default=H4GovernanceMode.SHADOW) |
| 36 | + |
| 37 | + |
| 38 | +def _policy_engine_for_root(root: str | Path) -> PolicyEngine: |
| 39 | + return PolicyEngine(PolicyStore(Path(root).resolve())) |
| 40 | + |
| 41 | + |
| 42 | +def record_h4_shadow_event( |
| 43 | + audit: Any, |
| 44 | + run_id: str, |
| 45 | + *, |
| 46 | + surface: str, |
| 47 | + mode: H4GovernanceMode, |
| 48 | + allowed: bool, |
| 49 | + reason: str, |
| 50 | + context: dict[str, Any], |
| 51 | + enforced: bool, |
| 52 | + details: Optional[list[dict[str, Any]]] = None, |
| 53 | +) -> None: |
| 54 | + audit.record( |
| 55 | + 'h4_governance_shadow', |
| 56 | + run_id, |
| 57 | + surface=surface, |
| 58 | + mode=mode.value, |
| 59 | + allowed=allowed, |
| 60 | + enforced=enforced, |
| 61 | + reason=reason, |
| 62 | + context=context, |
| 63 | + details=details or [], |
| 64 | + ) |
| 65 | + |
| 66 | + |
| 67 | +def evaluate_approval_policy_shadow( |
| 68 | + *, |
| 69 | + workspace_root: str | Path | None, |
| 70 | + audit: Any, |
| 71 | + run_id: str, |
| 72 | + tool_name: str, |
| 73 | + arguments: dict[str, Any], |
| 74 | + destructive: bool, |
| 75 | + call_id: str, |
| 76 | +) -> bool: |
| 77 | + """Evaluate approval policies and record a shadow receipt. Never blocks.""" |
| 78 | + if workspace_root is None: |
| 79 | + return True |
| 80 | + |
| 81 | + mode = policy_governance_mode() |
| 82 | + context = { |
| 83 | + 'action': 'approve_tool', |
| 84 | + 'tool_name': tool_name, |
| 85 | + 'call_id': call_id, |
| 86 | + 'destructive': destructive, |
| 87 | + 'arguments': arguments, |
| 88 | + } |
| 89 | + engine = _policy_engine_for_root(workspace_root) |
| 90 | + effect, details = engine.evaluate_with_explanation( |
| 91 | + context, |
| 92 | + policy_type=PolicyType.APPROVAL, |
| 93 | + ) |
| 94 | + allowed = effect == PolicyEffect.ALLOW |
| 95 | + denying = next( |
| 96 | + (d for d in details if d.get('applies') and d.get('effect') == 'deny'), |
| 97 | + None, |
| 98 | + ) |
| 99 | + reason = ( |
| 100 | + f'Policy {denying["policy_id"]} would deny' |
| 101 | + if denying |
| 102 | + else 'Policy evaluation would allow' |
| 103 | + ) |
| 104 | + record_h4_shadow_event( |
| 105 | + audit, |
| 106 | + run_id, |
| 107 | + surface='approval', |
| 108 | + mode=mode, |
| 109 | + allowed=allowed, |
| 110 | + reason=reason, |
| 111 | + context=context, |
| 112 | + enforced=False, |
| 113 | + details=details, |
| 114 | + ) |
| 115 | + return True |
| 116 | + |
| 117 | + |
| 118 | +def check_subagent_launch_rbac( |
| 119 | + *, |
| 120 | + workspace_root: str | Path, |
| 121 | + audit: Any | None, |
| 122 | + parent_run_id: str, |
| 123 | + assignee: str, |
| 124 | + def_name: str, |
| 125 | + depth: int, |
| 126 | +) -> tuple[bool, str]: |
| 127 | + """RBAC gate for subagent launch. Shadow by default; enforce when configured.""" |
| 128 | + from teaagent.rbac import Permission, RBACSystem |
| 129 | + |
| 130 | + mode = rbac_governance_mode() |
| 131 | + context = { |
| 132 | + 'action': 'launch_subagent', |
| 133 | + 'subagent': def_name, |
| 134 | + 'depth': depth, |
| 135 | + 'parent_run_id': parent_run_id, |
| 136 | + } |
| 137 | + rbac = RBACSystem(workspace_root) |
| 138 | + allowed, reason = rbac.check_action_permission( |
| 139 | + assignee, |
| 140 | + 'start_workflow', |
| 141 | + context, |
| 142 | + ) |
| 143 | + if audit is not None: |
| 144 | + record_h4_shadow_event( |
| 145 | + audit, |
| 146 | + parent_run_id, |
| 147 | + surface='subagent_launch', |
| 148 | + mode=mode, |
| 149 | + allowed=allowed, |
| 150 | + reason=reason, |
| 151 | + context={ |
| 152 | + **context, |
| 153 | + 'assignee': assignee, |
| 154 | + 'permission': Permission.START_WORKFLOW.value, |
| 155 | + }, |
| 156 | + enforced=mode == H4GovernanceMode.ENFORCE and not allowed, |
| 157 | + details=[], |
| 158 | + ) |
| 159 | + if mode == H4GovernanceMode.ENFORCE and not allowed: |
| 160 | + return False, reason |
| 161 | + return True, reason |
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