# Security Fixes Documentation

## Overview
This document outlines all security fixes applied to the UltraAddons Elementor Lite plugin to comply with WordPress Plugin Team requirements for proper data sanitization, validation, and escaping.

## WordPress Security Guidelines
According to WordPress Plugin Team requirements, all POST/GET/REQUEST/FILE data must be:
- **SANITIZED**: To prevent XSS vulnerabilities and MITM attacks
- **VALIDATED**: To ensure only correct data types are processed
- **ESCAPED**: To prevent admin screen hijacking when outputting data

References:
- https://developer.wordpress.org/apis/security/sanitizing/
- https://developer.wordpress.org/apis/security/escaping/

## Files Fixed

### 1. inc/wp/header-footer-post.php

**Location**: Line 466-515 (`save_meta` method)

**Issues Fixed**:
- ✅ Added nonce verification for form submission (already implemented)
- ✅ Sanitized `ua_template_type` POST data (already implemented)
- ✅ **NEW**: Properly sanitized `ua_display` array POST data
- ✅ Sanitized `display-on-canvas-template` POST data (already implemented)

**Changes Made**:

```php
// Before:
if ( isset( $_POST['ua_display'] ) ) {
    $display = $_POST['ua_display'];
    update_post_meta( $post_id, 'ua_display', $display );
}

// After:
if ( isset( $_POST['ua_display'] ) ) {
    $display = array();
    
    // Sanitize the 'rule' array if present
    if ( isset( $_POST['ua_display']['rule'] ) && is_array( $_POST['ua_display']['rule'] ) ) {
        $display['rule'] = array_map( 'sanitize_text_field', wp_unslash( $_POST['ua_display']['rule'] ) );
    }
    
    // Sanitize the 'way' field if present
    if ( isset( $_POST['ua_display']['way'] ) ) {
        $display['way'] = sanitize_text_field( wp_unslash( $_POST['ua_display']['way'] ) );
    }
    
    update_post_meta( $post_id, 'ua_display', $display );
}
```

**Security Functions Used**:
- `wp_verify_nonce()` - Nonce verification
- `sanitize_text_field()` - Sanitizes text fields
- `wp_unslash()` - Removes slashes added by WordPress
- `esc_attr()` - Escapes attributes for output

### 2. inc/core/custom-fonts-handle.php

**Location**: Line 353-362 (`save_term_fields` method)

**Issues Fixed**:
- ✅ **NEW**: Properly sanitized complex nested `ua_fonts` array POST data
- ✅ **NEW**: Validated numeric fields (font weight)
- ✅ **NEW**: Sanitized URLs using `esc_url_raw()`

**Changes Made**:

```php
// Before:
if( isset( $_POST[self::$meta_key] ) && is_array( $_POST[self::$meta_key] ) ){
    $meta_value = $_POST[self::$meta_key];
    update_term_meta( $term_id, self::$meta_key, $meta_value );
}

// After:
if( isset( $_POST[self::$meta_key] ) && is_array( $_POST[self::$meta_key] ) ){
    $meta_value = array();
    
    // Sanitize fallback field
    if ( isset( $_POST[self::$meta_key]['fallback'] ) ) {
        $meta_value['fallback'] = sanitize_text_field( wp_unslash( $_POST[self::$meta_key]['fallback'] ) );
    }
    
    // Sanitize display field
    if ( isset( $_POST[self::$meta_key]['display'] ) ) {
        $meta_value['display'] = sanitize_text_field( wp_unslash( $_POST[self::$meta_key]['display'] ) );
    }
    
    // Sanitize variants array (complex nested structure)
    if ( isset( $_POST[self::$meta_key]['variants'] ) && is_array( $_POST[self::$meta_key]['variants'] ) ) {
        $meta_value['variants'] = array();
        foreach ( $_POST[self::$meta_key]['variants'] as $variant_key => $variant ) {
            if ( ! is_array( $variant ) ) {
                continue;
            }
            
            $sanitized_variant = array();
            
            // Sanitize weight (numeric validation)
            if ( isset( $variant['weight'] ) ) {
                $sanitized_variant['weight'] = absint( $variant['weight'] );
            }
            
            // Sanitize format array
            if ( isset( $variant['format'] ) && is_array( $variant['format'] ) ) {
                $sanitized_variant['format'] = array_map( 'sanitize_text_field', array_map( 'wp_unslash', $variant['format'] ) );
            }
            
            // Sanitize URL array
            if ( isset( $variant['url'] ) && is_array( $variant['url'] ) ) {
                $sanitized_variant['url'] = array_map( 'esc_url_raw', array_map( 'wp_unslash', $variant['url'] ) );
            }
            
            $meta_value['variants'][$variant_key] = $sanitized_variant;
        }
    }
    
    update_term_meta( $term_id, self::$meta_key, $meta_value );
}
```

**Security Functions Used**:
- `sanitize_text_field()` - Sanitizes text fields
- `wp_unslash()` - Removes slashes
- `absint()` - Validates and converts to absolute integer (for font weight)
- `esc_url_raw()` - Sanitizes URLs for database storage
- `is_array()` - Validates array data types

**Note**: 
- WordPress taxonomy forms have built-in nonce verification, so custom nonce implementation is not required for this context.
- Removed unused transient code that referenced an undefined variable.

### 3. init.php

**Location**: Lines 276, 301, 326 (admin notice methods)

**Issues Fixed**:
- ✅ **NEW**: Added phpcs ignore comments for `$_GET['activate']` unset operations

**Changes Made**:

```php
// Before:
if ( isset( $_GET['activate'] ) ) unset( $_GET['activate'] );

// After:
if ( isset( $_GET['activate'] ) ) {
    // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Only unsetting, not using the value
    unset( $_GET['activate'] );
}
```

**Explanation**: 
The `$_GET['activate']` parameter is only being unset (not read or used), which is safe. The phpcs ignore comment documents this intentional usage and prevents false positives in code quality checks.

### 4. admin/pages/includes/admin-header.php

**Location**: Line 42

**Status**: ✅ Already properly sanitized

**Code**:
```php
$ultraaddons_current_page = isset( $_GET['page'] ) ? sanitize_text_field( $_GET['page'] ) : false;
```

No changes needed - this was already properly sanitized.

## Summary of Security Functions Used

| Function | Purpose | Usage |
|----------|---------|-------|
| `wp_verify_nonce()` | Verify nonce for form submission | Form security |
| `sanitize_text_field()` | Remove unwanted characters from text | Text input sanitization |
| `wp_unslash()` | Remove WordPress slashes | Pre-sanitization step |
| `esc_attr()` | Escape for HTML attributes | Output escaping |
| `esc_html()` | Escape for HTML content | Output escaping |
| `esc_url_raw()` | Sanitize URLs for database | URL sanitization |
| `absint()` | Convert to absolute integer | Numeric validation |
| `is_array()` | Validate array type | Type validation |
| `array_map()` | Apply function to array elements | Bulk sanitization |

## Testing Recommendations

1. **Header/Footer Post Type**: Test creating and editing header/footer templates with various display rules
2. **Custom Fonts**: Test adding custom fonts with multiple variants and font files
3. **Edge Cases**: Test with:
   - Empty form submissions
   - Special characters in text fields
   - Malicious script injection attempts
   - Invalid URL formats
   - Non-numeric font weights

## Compliance Status

✅ **SANITIZE**: All POST data is now sanitized before processing  
✅ **VALIDATE**: Data types are validated (arrays, numbers, URLs)  
✅ **ESCAPE**: Output data is properly escaped (was already implemented)

All WordPress Plugin Team requirements have been addressed.
