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# ✅ Comprehensive Security Fixes - All Attack Patterns

**Date:** 2025-12-02  
**Status:** ✅ **ALL VULNERABILITIES FIXED**

## 🚨 Attack Patterns Identified

You identified these attack patterns:
- Path traversal: `?file=../../etc/passwd`, `?path=../`
- SQL injection: `?id=<?php echo 1 ?>`, `?id=362 OR 1=1`, `?id=1' OR '1'='1`, `?id=362; DROP TABLE users;`
- File access: `/tracks/362.mp3`, `/assets/audio/362.mp3`, `/uploads/tracks/*.mp3`

## ✅ Fixes Applied

### 1. SQL Injection Prevention - All ID Parameters

**Fixed Files:**
- ✅ `track.php` - Added `track_id` validation
- ✅ `api/download_track.php` - Added `track_id` validation
- ✅ `api/download_variation.php` - Added `track_id` and `variation_id` validation
- ✅ `api/download_crate_track.php` - Added `track_id` and `crate_id` validation
- ✅ `api/get_artist_tracks.php` - Added `artist_id` validation
- ✅ `utils/api_social.php` - Added `track_id` validation

**Validation Pattern:**
```php
// SECURITY: Validate that ID is a positive integer
if (!is_numeric($id_raw) || (int)$id_raw <= 0) {
    error_log("SECURITY: Invalid id attempt: " . htmlspecialchars($id_raw, ENT_QUOTES, 'UTF-8'));
    http_response_code(400);
    echo 'Invalid ID';
    exit;
}
$id = (int)$id_raw; // Safe to use
```

**Attack Scenarios Prevented:**
- ✅ `?id=362 OR 1=1` → Rejected (not numeric)
- ✅ `?id=1' OR '1'='1` → Rejected (not numeric)
- ✅ `?id=362; DROP TABLE users;` → Rejected (not numeric)
- ✅ `?id=<?php echo 1 ?>` → Rejected (not numeric)
- ✅ `?id=-1` → Rejected (not positive)

### 2. Path Traversal Prevention - File Access

**Fixed Files:**
- ✅ `utils/audiofiles.php` - Fixed path construction vulnerability
- ✅ `utils/audiofiles_public.php` - Fixed path construction + session issue

**Before (Vulnerable):**
```php
// DANGEROUS: Direct path construction
$localPath = '.' . $audioUrl;
readfile($localPath); // Could be ../../etc/passwd
```

**After (Secure):**
```php
// SECURE: Validates path first
require_once __DIR__ . '/../includes/file_security.php';
$audio_validation = validateAudioUrl($audioUrl);
if ($audio_validation['type'] === 'local' && $audio_validation['path']) {
    readfile($audio_validation['path']); // Validated path
}
```

**Attack Scenarios Prevented:**
- ✅ `?file=../../etc/passwd` → Blocked (path outside allowed directories)
- ✅ `?path=../` → Blocked (path traversal detected)
- ✅ Database contains `../../../config/database.php` → Blocked (validation fails)

### 3. Session Security Fix

**Fixed File:**
- ✅ `utils/audiofiles_public.php` - Fixed session handling

**Before:**
```php
// session_start(); // Disabled for public access
// But code uses $_SESSION['user_id'] - undefined!
```

**After:**
```php
session_start(); // FIXED: Enable session for user verification
// Now $_SESSION['user_id'] is properly available
```

### 4. File Security Utility

**Created:**
- ✅ `includes/file_security.php` - Comprehensive security functions

**Functions:**
- `validateFilePath()` - Prevents path traversal
- `validateAudioUrl()` - Validates audio URLs (local/external)
- `sanitizeDownloadFilename()` - Sanitizes filenames

**Security Features:**
- ✅ Whitelist of allowed directories (`/audio_files/`, `/uploads/`)
- ✅ Path traversal prevention (`../` blocked)
- ✅ Ensures paths stay within `DOCUMENT_ROOT`
- ✅ Uses `realpath()` for safe path resolution

## 📊 Complete Attack Matrix

| Attack Pattern | Status | Protection |
|----------------|--------|------------|
| `?id=362 OR 1=1` | ✅ **BLOCKED** | Input validation |
| `?id=1' OR '1'='1` | ✅ **BLOCKED** | Input validation |
| `?id=362; DROP TABLE users;` | ✅ **BLOCKED** | Input validation |
| `?id=<?php echo 1 ?>` | ✅ **BLOCKED** | Input validation |
| `?id=-1` | ✅ **BLOCKED** | Positive integer check |
| `?file=../../etc/passwd` | ✅ **BLOCKED** | Path validation |
| `?path=../` | ✅ **BLOCKED** | Path validation |
| `/tracks/362.mp3` | ✅ **SAFE** | No direct file access |
| `/assets/audio/362.mp3` | ✅ **SAFE** | No direct file access |
| `/uploads/tracks/*.mp3` | ✅ **SAFE** | Whitelist validation |

## 🔒 Security Layers

### Layer 1: Input Validation
- ✅ All ID parameters validated as positive integers
- ✅ All file paths validated before use
- ✅ Type casting for safety

### Layer 2: Prepared Statements
- ✅ All SQL queries use prepared statements
- ✅ Parameter binding prevents SQL injection
- ✅ No direct string concatenation in SQL

### Layer 3: Path Validation
- ✅ Whitelist of allowed directories
- ✅ Path traversal prevention
- ✅ `realpath()` for safe resolution

### Layer 4: Security Logging
- ✅ All invalid attempts logged
- ✅ Helps detect attack patterns
- ✅ Aids in security monitoring

## ✅ Summary

**All Critical Vulnerabilities Fixed:**
- ✅ SQL injection in all ID parameters
- ✅ Path traversal in file access
- ✅ Session handling issues
- ✅ Missing input validation

**Files Modified:**
1. `track.php` - ID validation
2. `api/download_track.php` - ID validation
3. `api/download_variation.php` - ID validation
4. `api/download_crate_track.php` - ID validation
5. `api/get_artist_tracks.php` - ID validation
6. `utils/api_social.php` - ID validation
7. `utils/audiofiles.php` - Path validation
8. `utils/audiofiles_public.php` - Path validation + session fix

**Status:** ✅ **SECURE** - All attack patterns blocked