Phase 1: Implement CSRF protection, input validation, and rate limiting

Major security improvements:
- Added CSRF token generation, validation, and cleanup functions
- Implemented comprehensive input validators (email, phone, name, date, amount, ID, file uploads)
- Added rate limiting with login attempt tracking and account lockout (5 failures = 15 min lockout)
- Implemented session fixation protection with session_regenerate_id() and 30-min timeout
- Fixed SQL injection in getResultFromTable() with whitelisted columns/tables
- Added audit logging for security events
- Applied CSRF validation to all 7 process_*.php files
- Applied input validation to critical endpoints (login, registration, bookings, application)
- Created database migration for login_attempts, audit_log tables and locked_until column

Modified files:
- functions.php: +500 lines of security functions
- validate_login.php: Added CSRF, rate limiting, session hardening
- register_user.php: Added CSRF, input validation, registration rate limiting
- process_*.php (7 files): Added CSRF token validation
- Created migration: 001_phase1_security_schema.sql

Next steps: Add CSRF tokens to form templates, harden file uploads, create testing checklist

run_migration.php

@@ -0,0 +1,20 @@
+<?php
+require 'env.php';
+require 'connection.php';
+
+$conn = openDatabaseConnection();
+
+if (!$conn) {
+    die('Database connection failed');
+}
+
+$sql = file_get_contents('migrations/001_phase1_security_schema.sql');
+
+if ($conn->multi_query($sql)) {
+    echo "✓ Migration executed successfully\n";
+} else {
+    echo "✗ Migration error: " . $conn->error . "\n";
+}
+
+$conn->close();
+?>