This document describes the security enhancements implemented in the PropChain authentication system to strengthen security and remove insecure console logging.

• Issue: Sensitive information (tokens, emails) was exposed in production logs
• Solution: Replaced all console.log statements with structured logging using StructuredLoggerService
• Files Modified: src/auth/auth.service.ts

• Issue: JWT tokens couldn't be revoked once issued
• Solution: Implemented token blacklisting using Redis with automatic TTL expiration
• Features:
  • Blacklist tokens on logout with proper TTL
  • JWT guard checks blacklisted tokens
  • Automatic cleanup of expired blacklisted tokens
• Files Modified:
  • src/auth/auth.service.ts
  • src/auth/guards/jwt-auth.guard.ts
  • src/auth/auth.controller.ts

• Issue: No protection against password guessing attacks
• Solution: Implemented login attempt tracking with account locking
• Features:
  • Track failed attempts by email and IP address
  • Lock accounts after configurable number of failed attempts
  • Automatic lockout expiration
  • Exponential backoff for repeated failures
• Files Created: src/auth/guards/login-attempts.guard.ts
• Files Modified:
  • src/auth/auth.controller.ts
  • src/auth/auth.module.ts

• Issue: Weak password requirements and no validation
• Solution: Implemented comprehensive password validation and security policies
• Features:
  • Configurable password strength requirements
  • Password pattern validation (length, special chars, numbers, uppercase)
  • Common password pattern detection
  • Configurable bcrypt rounds
• Files Created:
  • src/common/validators/password.validator.ts
• Files Modified:
  • src/users/user.service.ts
  • src/users/users.module.ts
  • src/config/configuration.ts
  • src/config/interfaces/joi-schema-config.interface.ts

• Issue: No proper session tracking or management
• Solution: Implemented Redis-based session management
• Features:
  • Track active sessions per user
  • Session timeout configuration
  • API endpoints for session management
  • Concurrent session limiting
• Files Modified:
  • src/auth/auth.service.ts
  • src/auth/auth.controller.ts

• Issue: No additional authentication factors beyond password
• Solution: Implemented TOTP-based MFA with backup codes
• Features:
  • TOTP (Time-based One-Time Password) support
  • QR code generation for authenticator apps
  • Backup codes for recovery
  • MFA status management
  • API endpoints for MFA setup and management
• Files Created:
  • src/auth/mfa/mfa.service.ts
  • src/auth/mfa/mfa.controller.ts
  • src/auth/mfa/mfa.module.ts
  • src/auth/mfa/index.ts

# Password Security
PASSWORD_MIN_LENGTH=12
PASSWORD_REQUIRE_SPECIAL_CHARS=true
PASSWORD_REQUIRE_NUMBERS=true
PASSWORD_REQUIRE_UPPERCASE=true
PASSWORD_HISTORY_COUNT=5
PASSWORD_EXPIRY_DAYS=90

# Authentication Security
JWT_BLACKLIST_ENABLED=true
LOGIN_MAX_ATTEMPTS=5
LOGIN_LOCKOUT_DURATION=900
SESSION_TIMEOUT=3600
MFA_ENABLED=true
MFA_CODE_EXPIRY=300

# Security
BCRYPT_ROUNDS=12
SESSION_SECRET=your-session-secret-key-change-this-in-production

• POST /auth/login - Login with email/password (protected by brute force guard)
• POST /auth/web3-login - Web3 wallet login
• POST /auth/logout - Logout and blacklist current token
• POST /auth/refresh-token - Refresh access token
• POST /auth/register - Register new user
• POST /auth/forgot-password - Request password reset
• PUT /auth/reset-password - Reset password with token
• GET /auth/verify-email/:token - Verify email address

• GET /auth/sessions - Get all active sessions
• DELETE /auth/sessions/:sessionId - Invalidate specific session
• DELETE /auth/sessions - Invalidate all sessions

• POST /mfa/setup - Generate MFA setup QR code
• POST /mfa/verify - Verify and complete MFA setup
• GET /mfa/status - Get MFA status
• DELETE /mfa/disable - Disable MFA
• POST /mfa/backup-codes - Generate new backup codes
• POST /mfa/verify-backup - Verify backup code

• test/auth/mfa.service.spec.ts - MFA service unit tests
• Password validation tests in user service tests

• test/auth/security.e2e-spec.ts - Comprehensive security tests including:
  • Token blacklisting
  • Brute force protection
  • Password security validation
  • Session management

# Login Attempts
login_attempts:{email} -> {count} (expires after lockout duration)
login_attempts:ip:{ip} -> {count} (expires after lockout duration)

# Token Blacklisting
blacklisted_token:{jti} -> {userId} (expires with token TTL)

# Active Sessions
active_session:{userId}:{jti} -> {sessionData} (expires with session TTL)

# MFA Data
mfa_setup:{userId} -> {secret} (temporary, expires after setup timeout)
mfa_secret:{userId} -> {secret} (permanent MFA secret)
mfa_backup_codes:{userId} -> {codesArray} (expires after 12 hours)
mfa_verified:{userId}:{token} -> {1} (prevents replay attacks, expires after timeout)

1. Never log sensitive data - All sensitive information is filtered from logs
2. Proper token invalidation - Tokens can be blacklisted and revoked
3. Rate limiting - Prevents brute force attacks
4. Strong password requirements - Configurable password policies
5. Session management - Track and control active sessions
6. Multi-factor authentication - Additional security layer
7. Secure configuration - Environment-based security settings
8. Comprehensive testing - Unit and integration tests for security features

1. Environment Configuration: Ensure proper environment variables are set in production
2. Redis Configuration: Configure Redis with appropriate persistence and security settings
3. Monitoring: Set up monitoring for security events and failed login attempts
4. Backup Codes: Ensure users store MFA backup codes securely
5. Regular Audits: Periodically review security logs and configurations

1. IP-based restrictions - Allow/deny lists for specific IP ranges
2. Device fingerprinting - Track and verify user devices
3. Adaptive authentication - Risk-based authentication decisions
4. Security headers - Implement additional HTTP security headers
5. Audit logging - Comprehensive security event logging
6. Compliance reporting - Generate security compliance reports