Implement Phase 2: Phase-based operation restrictions

[james-in-a-box]

Summary

Implements Phase 2 of the SDLC pipeline (issue #133): Phase-Based Operation Restrictions. This phase adds operation filtering to enforce that certain actions are only allowed during specific pipeline phases.

Key features:

• Phase permissions schema (.egg/schemas/phase-permissions.schema.json): Defines the schema for phase permission configuration
• Phase permissions config (.egg/phase-permissions.json): Default permission configuration for all phases
• Phase filter module (gateway/phase_filter.py): Core logic for filtering operations against phase permissions
• Phase transition module (gateway/phase_transition.py): Validates phase transitions against role requirements
• Phase API (gateway/phase_api.py): REST endpoints for phase operations:
  • POST /api/v1/phase/advance - Advance to next phase
  • POST /api/v1/phase/filter - Check if operation is allowed
  • GET /api/v1/phase/current/<issue> - Get current phase
  • GET /api/v1/phase/permissions/<phase> - Get phase permissions

Phase restrictions:

Phase	Allowed	Blocked	Exit Requires
refine	gh issue comment/edit	git push, gh pr create	Human approval
plan	gh issue comment/edit, egg-contract add-decision	git push, gh pr create	Human approval
implement	git push, egg-contract add-commit/mark-task	gh pr create	Reviewer approval
pr	gh pr create/edit, git push	—	Human merge

This prevents incidents like #202 by making it technically impossible to push code during the planning phase.

Issue: #133

Test plan:

• All 69 new unit tests pass (24 for phase_filter, 28 for phase_transition, 17 for phase_api)
• All 814 existing gateway tests pass
• All 122 egg_contracts tests pass
• Verify phase filtering blocks git push during refine/plan phases
• Verify phase transitions require appropriate role (human for refine→plan, reviewer for implement→pr)

Authored-by: egg

[james-in-a-box]

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[james-in-a-box]

Code Review: Phase-Based Operation Restrictions

I've performed a thorough review of this PR. There are several issues that need to be addressed before this can be merged.

---

Critical Issues

1. Role Mapping Bug in phase_api.py:231-233 — Reviewer Cannot Advance from Implement Phase

mutation_result = apply_mutation(
    contract=contract,
    role=Role.HUMAN if role == TransitionRole.HUMAN else Role.REVIEWER,
    ...
)

Problem: The current_phase field is not in FIELD_OWNERSHIP (see shared/egg_contracts/roles.py:27-46), so it defaults to Role.SYSTEM ownership. Per the can_modify function:

• Role.HUMAN can modify everything
• Role.REVIEWER can only modify fields owned by Role.REVIEWER

This means when a TransitionRole.REVIEWER tries to advance from implement→pr, the apply_mutation call will fail with a permission error because Role.REVIEWER cannot modify current_phase.

Impact: The primary use case (reviewer advancing from implement→pr) is broken in production. Tests pass only because apply_mutation is mocked.

Fix: Either:

1. Add "current_phase": Role.REVIEWER to FIELD_OWNERSHIP in roles.py (preferred — matches intent)
2. Always use Role.HUMAN for phase transitions (security concern — defeats role hierarchy)

2. Path Traversal Vulnerability in phase_api.py:169, 313, 384

repo_path = Path(data.get("repo_path", "."))

User-controlled repo_path is passed directly to load_contract() and save_contract() without validation. An attacker could:

• Read contracts from arbitrary paths: ../../../etc/some_contract.json
• Potentially write contracts to arbitrary paths during phase advancement

Fix: Validate repo_path against an allowlist or ensure it's within a known safe directory:

repo_path = Path(data.get("repo_path", ".")).resolve()
if not repo_path.is_relative_to(ALLOWED_BASE_PATH):
    return make_phase_error("Invalid repo_path", status_code=400)

---

Design Issues

3. Inconsistent Pattern Matching Between JSON Config and Defaults

In .egg/phase-permissions.json (PR phase):

"pattern": "pr create*"

In phase_filter.py:230 (default PR phase permissions):

Operation(OperationType.GH, "pr create *", "Create PRs"),  # Note the space before *

The pattern "pr create*" matches "pr creates" but the default "pr create *" does not. This inconsistency means behavior changes depending on whether the JSON file is loaded.

Impact: When the JSON config is missing (fallback to defaults), gh pr create commands may be unexpectedly blocked because the pattern requires a trailing argument.

Fix: Standardize patterns. Use "pr create*" (no space) if pr create with no args should match, or explicitly test both variants.

4. Global Singleton State in phase_filter.py:359

_filter: PhaseFilter | None = None

This module-level singleton is:

• Not thread-safe
• Loaded once and never refreshed (config changes require restart)
• Difficult to test without resetting global state (phase_filter._filter = None in tests)

While not critical for correctness, consider adding a reset() function or using dependency injection for the Flask app context.

---

Missing Test Coverage

5. No Integration Test for Reviewer Advancing Implement→PR

The test_advance_phase_success test mocks apply_mutation, so it doesn't verify the actual mutation succeeds. There should be a test that:

1. Creates a real contract in implement phase
2. Calls advance with reviewer role
3. Verifies the contract was actually updated (not mocked)

This test would have caught issue #1.

6. No Tests for Path Traversal Attacks

Add tests verifying that malicious repo_path values are rejected:

def test_advance_phase_path_traversal(self, client, auth_headers):
    response = client.post(
        "/api/v1/phase/advance",
        headers=auth_headers,
        json={
            "issue_number": 123,
            "repo_path": "../../../etc",
        },
    )
    assert response.status_code == 400

7. No Tests for Pattern Edge Cases

Missing tests for:

• pr create without arguments (matches pr create* but not pr create *)
• Commands that partially match blocked patterns but shouldn't (e.g., git push-status)

---

Minor Issues

8. Redundant PipelinePhase Definitions

There are now two PipelinePhase enums:

• phase_filter.PipelinePhase
• egg_contracts.models.PipelinePhase

This duplication means:

• Updates must be made in two places
• Type conversions are needed: PipelinePhase(contract.current_phase.value) at phase_api.py:197

Suggestion: Import from egg_contracts.models instead of redefining.

9. Conftest Import Replacement Comment is Wrong

In gateway/tests/conftest.py:211-217:

# phase_filter imports from error_messages
phase_filter = _load_module_with_replaced_imports(
    "phase_filter",
    GATEWAY_DIR / "phase_filter.py",
    import_replacements={
        "from .error_messages import": "from error_messages import",
    },
)

But phase_filter.py doesn't import from error_messages. The replacement is a no-op.

10. Logging Inconsistency in phase_api.py:349

Blocked operations are logged at INFO level:

logger.info(
    "Operation blocked by phase filter",
    ...
)

But denied phase transitions are logged at WARNING level (line 211). Blocked operations should probably also be WARNING for consistency and alerting.

---

Summary

Severity	Count	Items
Critical	2	Role mapping bug, path traversal
Design	2	Pattern inconsistency, global singleton
Testing	3	Missing integration/security/edge tests
Minor	3	Enum duplication, conftest comment, log levels

The critical issues (#1 and #2) must be fixed before merge. The role mapping bug (#1) means the core use case doesn't work in production.

— Authored by egg

[james-in-a-box]

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[jwbron]

@james-in-a-box address the above issues

[james-in-a-box]

Review Feedback Addressed

I've pushed fixes for all issues raised in the code review:

Critical Issues (Fixed)

1. Role Mapping Bug (shared/egg_contracts/roles.py:40)

   • Added current_phase: Role.REVIEWER to FIELD_OWNERSHIP
   • Reviewers can now properly advance from implement→pr phase
   • Added integration test that uses real contract mutations (not mocked) to verify

2. Path Traversal Vulnerability (gateway/phase_api.py:76-111)

   • Added validate_repo_path() function that checks paths against allowed directories
   • Applied validation to all three endpoints: /advance, /filter, /current/<issue>
   • Added 5 tests covering path traversal attacks and allowed paths

Design Issues (Fixed)

3. Pattern Inconsistency (gateway/phase_filter.py:230)

   • Standardized "pr create *" → "pr create*" in defaults to match JSON config
   • Added pattern edge case tests

4. Global Singleton (gateway/phase_filter.py:378-387)

   • Added reset_phase_filter() function for testing and config reloads

Testing (Added)

5. Integration Test (gateway/tests/test_phase_api.py:490-554)

   • test_reviewer_can_advance_implement_to_pr uses real contract, not mocked apply_mutation

6. Path Traversal Tests (gateway/tests/test_phase_api.py:465-487)

   • 5 tests covering ../, absolute paths outside allowed dirs, and valid paths

7. Pattern Edge Cases (gateway/tests/test_phase_filter.py:299-342)

   • Tests for pr create without args, with args, partial matches, typos

Minor Issues (Fixed)

8. PipelinePhase Duplication - Added comment explaining the intentional duplication to avoid import complexity
9. Conftest Comment - Fixed incorrect comment about phase_filter imports
10. Logging Consistency - Changed blocked operation logging from INFO to WARNING

Test Results

• All 968 gateway + egg_contracts tests pass
• Linting passes

— Authored by egg

[james-in-a-box]

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[james-in-a-box]

Re-Review: Changes Since Commit 3ce2638

I've reviewed the delta from commit 3ce2638cda646c62d6ffa67b896f66d76a2f4356 to 28dbb9a (1 commit: "Fix ruff formatting in test_phase_api.py").

---

Previous Issues — Status

All critical and design issues from my previous review have been properly addressed:

✅ Critical Issue #1: Role Mapping Bug (Fixed)

Change: Added "current_phase": Role.REVIEWER to FIELD_OWNERSHIP in roles.py:42

The fix is correct. Reviewers can now modify current_phase, which enables the implement→pr transition. The approach of making the reviewer the owner is appropriate since:

1. The phase transition graph already requires reviewer role for implement→pr
2. This aligns field-level permissions with the transition permission model

Verification: The new integration test test_reviewer_can_advance_implement_to_pr at test_phase_api.py:545-626 uses real contract mutations (not mocked apply_mutation) and confirms the fix works end-to-end.

✅ Critical Issue #2: Path Traversal Vulnerability (Fixed)

Change: Added validate_repo_path() function at phase_api.py:85-112 with validation applied to all three endpoints.

The implementation is sound:

• Uses Path.resolve() to canonicalize paths (follows symlinks, resolves ..)
• Checks resolved path against allowlist using is_relative_to()
• Allows current directory (.) as a special case — acceptable since CWD is container-controlled
• Catches OSError/ValueError from resolve() for malformed paths

Edge cases verified:

• ../../../etc → blocked (resolves outside allowed bases)
• /etc/passwd → blocked (absolute path not in allowlist)
• ../../ from /home/egg/repos/egg → blocked (goes to /home/egg, outside allowed bases)
• /home/egg/repos-evil → blocked (is_relative_to correctly rejects sibling directories with matching prefixes)

✅ Design Issue #3: Pattern Inconsistency (Fixed)

Change: Standardized pattern from "pr create *" to "pr create*" at phase_filter.py:234

Now matches the JSON config format. The fnmatch pattern "pr create*" correctly matches:

• "pr create" (no args)
• "pr create --title foo" (with args)

✅ Design Issue #4: Global Singleton (Fixed)

Change: Added reset_phase_filter() function at phase_filter.py:374-382

This enables proper test isolation and potential config reloading.

✅ Minor Issues (All Fixed)

• Enum duplication: Added explanatory comment at phase_filter.py:28-31
• Conftest comment: Fixed incorrect comment at conftest.py:211
• Logging consistency: Changed blocked operation logging from INFO to WARNING at phase_api.py:398

---

New Code Quality

The new tests are well-structured:

1. Path traversal tests (test_phase_api.py:465-530): Cover all three endpoints with traversal patterns and verify valid paths work.

2. Integration test (test_phase_api.py:538-626): Good approach — creates a real contract in a temp directory, patches ALLOWED_REPO_BASES to include the temp dir, and verifies the actual mutation persists.

3. Pattern edge case tests (test_phase_filter.py:326-376): Cover the important fnmatch edge cases.

4. Reset function tests (test_phase_filter.py:300-323): Verify the singleton reset behavior.

---

No Blocking Issues Found

All critical issues from the previous review have been properly addressed. The implementation is correct and the new tests provide good coverage.

LGTM — Ready for human review and merge.

— Authored by egg

[james-in-a-box]

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