[krishanth7]

Summary

This pull request completes Phase 5.6: Read-Only Enforcement, Timeouts & Safety and achieves final milestone certification for Phase 5: Database Connectors & Metadata Inspection for DERA (Database Engineering & Reverse Analysis). It establishes a unified, fail-closed security subsystem across PostgreSQL, Supabase, SQLite, MySQL, and MariaDB connectors, guaranteeing read-only metadata inspection, SSRF egress protection, DNS rebinding defense, SQLite filesystem containment, multi-tenant workspace isolation, centralized timeout budgets, and cooperative cancellation.

Change Type

• Feature (feat)
• Bug fix (fix)
• Documentation (docs)
• Refactor (refactor)
• Performance (perf)
• Test improvement (test)
• CI/CD or Build (ci, build)
• Security enhancement (security)
• Breaking change (!)

Related Issues

Closes #42
Completes Phase 5.6 Engineering Implementation Directive
Certifies Phase 5 Completion (docs/audit/PHASE_5_COMPLETION.md)

Implementation Details

• Established modular security subsystem in packages/connectors/src/dera_connectors/security/:
  • policy.py: Unified ConnectorSecurityPolicy orchestrating tenant authorization, destination validation, and query allowlists.
  • readonly.py: Static lexical analysis, comment stripping (/* ... */, --, #), single-quote literal replacement, and DDL/DML mutation keyword blocking.
  • query_policy.py: ApprovedMetadataQueryRegistry governing pre-registered catalog queries with parameter validation and row caps.
  • destinations.py: Strict SSRF boundaries blocking cloud metadata (169.254.169.254), loopbacks, private subnets, dangerous service ports, and destination IP pinning.
  • credentials.py: Safe DatabaseCredentials container with repr=False, null byte detection, and ephemeral resolution.
  • authorization.py: Multi-tenant workspace authorization (validate_workspace_authorization) enforced before secret resolution.
  • isolation.py: SQLite path canonicalization (os.path.realpath), approved storage root containment, symlink escape checks, Windows device blocking (CON, PRN, NUL), and deterministic mode=ro URI generation.
  • timeouts.py: TimeoutBudget and monotonic DeadlineTracker propagating overall deadlines (default 120s) across multi-step inspections.
  • cancellation.py: EnhancedCancellationToken supporting parent-child propagation, driver interrupt callbacks, and transaction rollbacks.
  • resource_limits.py: Explicit caps on result rows (50,000), identifier lengths (1,024), SQL definition sizes (1MB), and total schema entities (100,000).
  • redaction.py: Recursive credential scrubbing (sanitize_diagnostics) and regex masking (mask_sensitive_strings).
  • audit.py: Structured security audit logging (log_security_audit_event) capturing forensic records without secret leakage.
• Authored 12 security architecture and testing specifications in docs/security/.
• Authored docs/audit/PHASE_5_6_SECURITY_BASELINE.md, docs/audit/PHASE_5_6_SECURITY_ACCEPTANCE.md, and docs/audit/PHASE_5_COMPLETION.md.

Testing

• Relevant tests passed (python scripts/development/dev.py all or test)
• Tests not applicable — explanation below
• Tests not run / blocked — explanation below

Test evidence & notes:

• Executed unit, network, filesystem, tenant isolation, and integration safety tests:
  • tests/security/connectors/: 23 passed
  • tests/security/network/: 8 passed
  • tests/security/filesystem/: 7 passed
  • tests/security/tenancy/: 4 passed
  • tests/integration/connector_safety/: 7 passed
  • tests/regression/connectors/: 4 passed
  • tests/security/ (platform security): 20 passed
• Full repository test suite passed with 587 tests:

  Ran 587 tests in 67.782s
  OK (skipped=2)
  

• Documentation linting (npm run docs:lint) passed with 0 issues in 291 files.
• Documentation link verification (python scripts/ci/validate_docs.py) passed.

Documentation Impact

• Documentation in docs/ updated or verified where required
• Documentation validation passed (npm run docs:check)
• No documentation updates required for this change

Security Impact & Deterministic Engineering

• Strict Non-AI Policy: Verified zero generative AI, LLM, or external inference APIs are introduced.
• Database Safety: Verified all database connector operations enforce read-only introspection without data modification.
• Credential Protection: Confirmed that no production credentials, passwords, or .env secrets are committed.
• Least Privilege: Validated that permissions and access boundaries are minimized.
• No Security Impact: Change does not affect database connections, security boundaries, or credentials.

Security Assessment Note:

• Completed STRIDE threat model evaluating 18 threat vectors (docs/security/CONNECTOR_THREAT_MODEL.md).
• Implemented read-only lexical analysis, SSRF egress filtering, destination IP pinning, SQLite root containment, workspace isolation, centralized deadlines, and non-retryable security error classification.

Breaking Changes

• No breaking changes.
• Breaking change introduced (detailed explanation and migration path below):

Contributor Checklist

• My code adheres to the project's coding standards (PEP 8, TypeScript strict mode).
• My branch is rebased on the latest main branch.
• The PR title follows Conventional Commits (e.g., feat(connectors): add SQLite metadata support).
• No unrelated changes or accidental files are included.

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[krishanth7]

All Phase 5.6 commits have been merged into main via fast-forward (commits 027c52c and 3730ed7). The security/phase-5.6-connector-safety branch is fully integrated. CI workflow fix (dera_connectors PYTHONPATH) is also live on main.