src/pqc_enclave_sdk/policy.py
| 1 | """Access policies - which app bundles / artifact kinds may be read by whom.""" |
| 2 | |
| 3 | from __future__ import annotations |
| 4 | |
| 5 | from dataclasses import dataclass, field |
| 6 | |
| 7 | from pqc_enclave_sdk.artifact import ArtifactKind, ArtifactMetadata |
| 8 | from pqc_enclave_sdk.errors import PolicyViolationError |
| 9 | |
| 10 | |
| 11 | @dataclass |
| 12 | class ArtifactPolicy: |
| 13 | """Policy rule for a single artifact kind.""" |
| 14 | |
| 15 | kind: ArtifactKind |
| 16 | allowed_bundle_ids: frozenset[str] |
| 17 | require_biometric: bool = False |
| 18 | max_uses_per_hour: int = 0 |
| 19 | |
| 20 | |
| 21 | @dataclass |
| 22 | class AccessPolicy: |
| 23 | """Collection of per-kind policies.""" |
| 24 | |
| 25 | rules: dict[ArtifactKind, ArtifactPolicy] = field(default_factory=dict) |
| 26 | |
| 27 | def add(self, rule: ArtifactPolicy) -> AccessPolicy: |
| 28 | self.rules[rule.kind] = rule |
| 29 | return self |
| 30 | |
| 31 | def check(self, artifact_meta: ArtifactMetadata, caller_bundle_id: str) -> None: |
| 32 | rule = self.rules.get(artifact_meta.kind) |
| 33 | if rule is None: |
| 34 | return |
| 35 | if ( |
| 36 | rule.allowed_bundle_ids |
| 37 | and caller_bundle_id not in rule.allowed_bundle_ids |
| 38 | ): |
| 39 | raise PolicyViolationError( |
| 40 | f"caller {caller_bundle_id} not allowed to read " |
| 41 | f"{artifact_meta.kind.value}" |
| 42 | ) |
| 43 | |