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v0.2.2 - Phase 5 Security Hardening

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@jondepalma jondepalma released this 30 Dec 03:46
· 29 commits to main since this release
v0.2.2
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Release v0.2.2 - Phase 5 Security Hardening

Release Date: 2025-12-29

Overview

Version 0.2.2 represents a major security hardening milestone with 7 vulnerability fixes, comprehensive compliance testing, and robust regression test coverage. This release strengthens didlite's security posture for production edge/IoT deployments while maintaining backward compatibility.

Security Fixes

Critical Priority

VULN-1: DoS Prevention (#33)

  • Added DID length limit (128 characters) to prevent OOM attacks on edge devices
  • Type validation prevents non-string inputs from reaching decode logic
  • Protects resource-constrained IoT deployments

VULN-7: TOCTOU Race Condition (#39)

  • Fixed file permissions race condition in FileKeyStore
  • Atomic file creation with os.open(..., 0o600) prevents window of insecure permissions
  • Eliminates Time-of-Check-Time-of-Use vulnerability

High Priority

VULN-4: Algorithm Enforcement (#36)

  • Prevents "None Algorithm" JWT attack (classic security vulnerability)
  • Enforces EdDSA-only algorithm (RFC 7515 compliance)
  • Rejects algorithm substitution attempts (RS256, HS256, etc.)

VULN-6: Future-Dating Protection (#38)

  • Prevents replay attacks with pre-generated future tokens
  • 60-second clock skew tolerance for distributed systems (RFC 7519)
  • Validates iat (issued-at) claim while maintaining backward compatibility

Medium Priority

VULN-2: Base64 Padding Fix (#34)

  • Corrected base64 padding formula: "=" * (-len(data) % 4)
  • RFC 7517 compliance for JWK import
  • Fixes edge case where len % 4 == 0 incorrectly added 4 padding chars

VULN-3: Lazy Imports (#35)

  • Extended lazy imports to keystore.py
  • MemoryKeyStore and EnvKeyStore work without cryptography installed
  • Maintains "lite" philosophy for minimal edge deployments

VULN-5: Compact JSON (#37)

  • RFC 7515 compliance with compact JSON serialization
  • Uses separators=(',', ':') to eliminate whitespace
  • Standards-compliant JWS token generation

New Features

Compliance Test Suite (#40)

  • 75 new tests validating W3C DID Core and RFC JWT/JWS standards
  • Test coverage:
    • W3C DID Method compliance
    • DID Resolution specification
    • JWK format validation (RFC 7517)
    • JWS compact serialization (RFC 7515)
    • JWT claims validation (RFC 7519)

Regression Test Suite (#41-#45)

  • 19 new tests preventing vulnerability reintroduction
  • Three test classes:
    • TestPhase5CoreRegressions: 5 tests for VULN-1, VULN-2
    • TestPhase5SecurityRegressions: 9 tests for VULN-4, VULN-5, VULN-6
    • TestPhase5KeystoreRegressions: 5 tests for VULN-7 (including threading race test)

Regression Testing Strategy

  • Added comprehensive guidance to CLAUDE.md
  • When to add regression tests (5 criteria)
  • Where to add tests (file-specific)
  • Coverage goals (100% security-critical paths)

Test Suite Growth

Metric v0.2.1 v0.2.2 Change
Total Tests 101 205 +103%
Coverage 95% 96% +1%
Lines Covered - 288/299 -

New Test Categories:

  • 75 compliance tests (W3C, RFC standards)
  • 19 regression tests (Phase 5 vulnerabilities)
  • 1 threading race condition test (TOCTOU verification)

Breaking Changes

None. All changes are non-breaking security enhancements.

Upgrade Guide

Simply update your dependency:

pip install --upgrade didlite

No code changes required. All security fixes are transparent to users.

Files Changed

 CLAUDE.md                |  48 ++++++
 didlite/core.py          |  36 ++++-
 didlite/jws.py           |  30 +++-
 didlite/keystore.py      |  39 +++--
 tests/test_compliance.py | 401 +++++++++++++++++++++++++++++++++++++++++
 tests/test_core.py       | 162 +++++++++++++++++
 tests/test_jws.py        | 314 ++++++++++++++++++++++++++++++++
 tests/test_keystore.py   | 193 ++++++++++++++++++++
 9 files changed, 1209 insertions(+), 19 deletions(-)

Verification

All tests pass:

pytest -v
# 203 passed, 2 skipped in 2.15s

Coverage report:

pytest --cov=didlite --cov-report=term-missing
# TOTAL: 96% (288/299 lines)

References

  • PHASE_5_FINDINGS.md: Detailed vulnerability analysis
  • Issues #33-#39: Individual vulnerability tickets
  • Issue #40: Compliance test suite
  • Issues #41-#45: Regression test implementation
  • Issue #46: Future test coverage improvements (v0.2.3)
  • PR #45: Phase 5 implementation
  • PR #47: Release preparation

Credits

Security analysis and fixes developed in collaboration with Claude Code (claude.ai/code).

🤖 Generated with Claude Code

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