feat(enforce): Slice 4.0+4.1 — kernel-op taxonomy and BPF policy lowering - #83
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4.0 — kernel-op taxonomy and BPF map schemas (frozen vocabulary): - python/vibap/bpf_types.py: OP_EXEC/OP_FILE_READ/OP_FILE_WRITE/ OP_NET_CONNECT/OP_EXTERNAL_SEND constants; ACT_ALLOW/DENY/ALLOWLIST; ENFORCE_MODE_PERMISSIVE/ENFORCE; SEC_TO_OPS mapping aligned to mission_compile._VALID_SIDE_EFFECT_CLASSES; schema dataclasses for cgroup_op_policy, cgroup_path_allow, cgroup_net_allow, enforce_events. - go/pkg/kernelcapture/bpf_enforce_types.go: Go-side types matching the six BPF map schemas (CgroupOpMapKey/Value, PathAllowPrefix, NetAllowPrefix, BpfEnforceEvent); BpfOp/BpfAction/BpfEnforceMode types with String() methods. 4.1 — bpf_lower.py, mirroring mission_compile.py: - lower_to_bpf_policy_plan(): lowers MissionDeclaration inputs to BpfPolicyPlan(op_policies, path_allow, net_allow, tier2_ops). - allowed_side_effect_classes → ACT_DENY for absent class ops. - forbidden_tools/allowed_tools projected via _tool_to_bpf_op() (keyword-component matching); unmappable → tier2_ops. - resource_scope + SubpathPolicy → path_allow + ACT_ALLOWLIST. - UrlAllowlistPolicy: hostname-only → tier2_ops; IP/CIDR → net_allow. - effect_policies/flow_policies/lineage_budgets → tier2_ops. - ENFORCE_STRICT loud-guard: raises MissionPolicyNotImplementedError on any unimplemented dimension (same philosophy as mission_compile). - 74 golden tests (test_bpf_lower.py) covering all lowering rules. Out of scope for this slice: BPF-LSM C program (4.2), daemon map-write path (4.2), kernel enforcement events (4.3+). Refs: Epic A (#63)
![github-advanced-security[bot]](https://avatars.githubusercontent.com/in/57789?s=60&v=4){kind=small}
| {"type": "url_allowlist", "allow_domains": ["api.example.com"]} | ||
| ] | ||
| ) | ||
| assert any("api.example.com" in t for t in plan.tier2_ops) |
| ] | ||
| ) | ||
| assert "10.0.0.1" in plan.net_allow | ||
| assert any("api.example.com" in t for t in plan.tier2_ops) |
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| from vibap.bpf_lower import ( | ||
| BpfLowerError, | ||
| BpfPolicyPlan, | ||
| OpPolicyEntry, | ||
| lower_to_bpf_policy_plan, | ||
| ) |
| import ipaddress | ||
| import re | ||
| from collections import defaultdict | ||
| from dataclasses import dataclass, field |
| "cargo"} | ||
| ) | ||
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| _EXTERNAL_SEND_KEYWORDS: frozenset[str] = frozenset( |
gnanirahulnutakki
marked this pull request as ready for review
July 1, 2026 14:13
This was referenced Jul 2, 2026
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Summary
Epic A Slice 4.0+4.1 — the pure-Python/Go foundation for the enforcement bridge.
No kernel code, no BPF program, no daemon writes yet — just the frozen schema and the lowering compiler.
Refs: #63 (Epic A), depends on / precedes PR #82 (Slice 1 daemon).
What this ships
4.0 — Kernel-op taxonomy + BPF map schemas
python/vibap/bpf_types.pyOP_EXEC / OP_FILE_READ / OP_FILE_WRITE / OP_NET_CONNECT / OP_EXTERNAL_SENDconstantsACT_ALLOW / ACT_DENY / ACT_ALLOWLISTandENFORCE_MODE_PERMISSIVE / ENFORCE_MODE_ENFORCESEC_TO_OPSmapping frommission_compile._VALID_SIDE_EFFECT_CLASSES→ BPF opsCgroupOpKey/Value,PathAllowKey,NetAllowKey,EnforceEventgo/pkg/kernelcapture/bpf_enforce_types.goCgroupOpMapKey/Value,PathAllowPrefix,NetAllowPrefix,BpfEnforceEventBpfOp / BpfAction / BpfEnforceModetyped constants withString()methods4.1 —
python/vibap/bpf_lower.pylower_to_bpf_policy_plan()→BpfPolicyPlan(op_policies, path_allow, net_allow, tier2_ops)allowed_side_effect_classesACT_DENYfor ops whose class is absentforbidden_toolsACT_DENYfor mappable ops; unmappable →tier2_opsallowed_toolsACT_ALLOWfor mappable ops; unmappable →tier2_opsresource_scope/SubpathPolicypath_allow+ACT_ALLOWLISTfor file opsUrlAllowlistPolicy(hostname)tier2_ops— BPF works on IP/CIDRUrlAllowlistPolicy(IP/CIDR)net_allow+ACT_ALLOWLISTfor net opseffect_policies / flow_policies / lineage_budgetstier2_ops;MissionPolicyNotImplementedErrorin ENFORCE_STRICTENFORCE_STRICT loud-guard: raises
MissionPolicyNotImplementedError(same class asmission_compile) on any dimension that can't be lowered to BPF. Never silently under-enforces.python/tests/test_bpf_lower.py— 74 golden tests covering every lowering rule.Explicitly NOT in this slice
process_enforce.bpf.c) — Slice 4.2net_prefixesTests