MSPE/BACKEND_SECURITY_FIXES.md

Backend Security Fixes Applied

Date: February 24, 2026

Summary

Comprehensive backend security review and fixes applied to the MSPE website PHP API. All critical and high-priority security issues have been addressed.

---

Issues Fixed

1. ✅ Missing CSRF Protection on Auth Endpoints

File: api/auth.php Issue: Login and password reset endpoints didn't validate same-origin requests. Fix: Added requireSameOriginRequest() call to auth POST endpoints. Impact: Prevents cross-site request forgery attacks on authentication endpoints.

2. ✅ Inconsistent Response Function Implementation

File: api/config.php Issue: jsonResponse() used exit() instead of die(), and didn't clean output buffer. Fix: Changed to die() and added ob_clean() for consistency, plus JSON flags for proper Unicode handling. Impact: Ensures clean API responses, better error handling.

3. ✅ Email Validation Issues

Files: api/auth.php, api/config.php, api/contact.php Issue: Missing email format validation in several endpoints. Fixes:

• Added email validation in password reset request
• Added comprehensive email parameter validation in sendEmail() function
• Added email validation in contact form submission
• Added email validation to subscribe endpoint (already present) Impact: Prevents malformed email data and reduces SMTP errors.

4. ✅ Email Function Error Handling

File: api/config.php Issue: sendEmail() lacked parameter validation and error handling. Fixes:

• Validates all email addresses with filter_var()
• Validates subject and body are not empty
• Validates reply-to email if provided
• Returns structured error responses Impact: Better error reporting for email failures.

5. ✅ recordFailedLogin Code Smell

File: api/auth.php Issue: Function called getRequestBody() internally, causing double-parsing. Fix: Changed to accept username parameter instead of re-parsing body. Impact: Better code efficiency and clarity.

6. ✅ File Upload Error Handling

File: api/config.php Issue: mkdir() and file operations lacked error checking. Fixes:

• Added return value checks for mkdir()
• Added write-permission verification
• Added path traversal protection in media deletion
• Added socket validity checks in file operations Impact: Prevents file system errors and directory traversal attacks.

7. ✅ SMTP Socket Connection Hardening

File: api/config.php Issues:

• Timeout was too short (20 seconds)
• Missing socket validity checks
• Missing timeout detection
• Missing parameter validation for port Fixes:
• Increased timeout to 30 seconds
• Added socket resource checks before operations
• Added timeout detection in expect function
• Added port range validation (1-65535)
• Added proper error logging Impact: More robust SMTP email delivery with better error handling.

8. ✅ Date/Time Validation in Bookings

File: api/bookings.php Issues:

• No validation of date format (YYYY-MM-DD)
• No validation of time format (HH:MM)
• No validation of time values (hours 0-23, minutes 0-59)
• No capacity range validation Fixes:
• Added regex validation for date format
• Added regex validation for time format
• Added range checks for hours and minutes
• Added capacity range validation (1-100)
• Applied to createAvailabilitySlot() and blockTime() functions Impact: Prevents invalid data entry and database corruption.

9. ✅ Phone Number Validation

File: api/contact.php Issue: Phone numbers weren't validated. Fix: Added basic phone number validation (minimum 5 digits, allows standard formatting). Impact: Better contact form data quality.

10. ✅ SQL Injection Prevention Enhancement

File: api/config.php Issue: Table name validation could theoretically be improved. Fix: Added table name length check (max 64 chars) and validation in ensureTable(). Impact: Additional layer of SQL injection prevention.

11. ✅ Media Path Traversal Protection

File: api/media.php Issue: Media deletion didn't verify files were in upload directory. Fix: Added realpath() check to verify path is within UPLOAD_DIR before deletion. Impact: Prevents directory traversal attacks in file deletion.

12. ✅ JSON Response Security

File: api/config.php Issue: JSON responses didn't specify encoding flags. Fix: Added JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE flags for proper encoding. Impact: Better handling of international characters and special characters.

---

Security Best Practices Already in Place

✅ Password Hashing: Using password_hash() with PASSWORD_DEFAULT ✅ Rate Limiting: Per-IP and per-username rate limiting on login attempts ✅ CSRF Protection: requireSameOriginRequest() on public POST endpoints ✅ Input Sanitization: Using sanitize() and sanitizeRichText() functions ✅ JWT Authentication: Secure token-based authentication with expiration ✅ HTTPS/TLS: HSTS headers and SSL/TLS enforcement ✅ Security Headers: XSS, clickjacking, and content security policy headers ✅ Audit Logging: All security events logged with IP, user, and timestamp ✅ File Upload Validation: MIME type verification and extension whitelist ✅ SQL Injection Prevention: Prepared statements and parameterized queries ✅ Email Validation: Using PHP's FILTER_VALIDATE_EMAIL ✅ Error Handling: Proper error codes and messages without exposing internals

---

Recommendations for Further Hardening

High Priority

1. Environment Configuration Review

   • Ensure .env file is not in webroot
   • Verify JWT_SECRET is properly set in production
   • Set APP_ENV to 'production' in production servers

2. Database Monitoring

   • Implement connection logging for debugging
   • Monitor for unusual query patterns
   • Set up alerts for failed authentication attempts

3. Rate Limiting Enhancement

   • Consider implementing Redis-based rate limiting for better performance
   • Add rate limiting to API endpoints (currently only on auth/contact)

Medium Priority

1. API Documentation

   • Document all endpoints with required authentication
   • Add rate limit information to API docs
   • Document error codes and messages

2. Monitoring & Alerts

   • Implement email notifications for failed login attempts (after threshold)
   • Monitor email delivery failures
   • Track usage patterns for anomaly detection

3. Testing

   • Add automated security tests for input validation
   • Test rate limiting thresholds
   • Validate CORS configuration

Low Priority

1. Performance Optimization

   • Cache frequently accessed data
   • Consider pagination defaults
   • Optimize database queries

2. Code Quality

   • Add type hints to functions
   • Increase test coverage
   • Add PHPDoc comments to all functions

---

Files Modified

• api/auth.php - CSRF protection, email validation, recordFailedLogin fix
• api/config.php - Email validation, file handling, SMTP hardening, JSON response, SQL injection prevention
• api/contact.php - Email validation, phone validation
• api/bookings.php - Date/time validation, capacity validation
• api/media.php - Path traversal protection

---

Testing Recommendations

1. Authentication Testing

# Test CSRF protection
curl -X POST https://example.com/api/auth.php \
  -H "Origin: https://malicious.com" \
  -d '{"action":"login","username":"admin","password":"test"}'
# Should return 403

2. Email Validation Testing

# Test invalid email
curl -X POST https://example.com/api/contact.php \
  -d '{"email":"invalid-email"}'
# Should return 400

3. Date/Time Validation Testing

# Test invalid date format
curl -X POST https://example.com/api/bookings.php?action=create-slot \
  -H "Authorization: Bearer TOKEN" \
  -d '{"date":"2026-02-invalid","time":"14:30"}'
# Should return 400

---

Deployment Checklist

• Update .env file with strong JWT_SECRET
• Set APP_ENV=production
• Enable HTTPS/TLS
• Configure SMTP credentials
• Set up backup and restore procedures
• Configure log rotation
• Test all email functionality
• Test all booking functionality
• Run security header verification
• Update API documentation
• Train support team on new error messages
• Monitor for any issues in first 24 hours

---

Version History

Date	Version	Changes
2026-02-24	1.0	Initial security audit and fixes

---

Contact

For security concerns or issues, contact: info@mspe.pro