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<?php |
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|
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namespace King_Addons; |
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|
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if (!defined('ABSPATH')) { |
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exit; |
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} |
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|
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class Upload_Email_File |
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{ |
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public function __construct() |
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{ |
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add_action('wp_ajax_king_addons_upload_file', [$this, 'handle_file_upload']); |
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add_action('wp_ajax_nopriv_king_addons_upload_file', [$this, 'handle_file_upload']); |
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// Add endpoint for dynamic nonce generation |
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add_action('wp_ajax_king_addons_get_fresh_nonce', [$this, 'get_fresh_nonce']); |
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add_action('wp_ajax_nopriv_king_addons_get_fresh_nonce', [$this, 'get_fresh_nonce']); |
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} |
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|
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public function handle_file_upload() |
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{ |
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// Security fix: Generate nonce server-side instead of relying on client-provided nonce |
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$server_nonce = wp_create_nonce('king-addons-js'); |
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if (!isset($_POST['king_addons_fb_nonce']) || !wp_verify_nonce($_POST['king_addons_fb_nonce'], 'king-addons-js')) { |
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wp_send_json_error(array( |
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'message' => esc_html__('Security check failed.', 'king-addons'), |
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)); |
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} |
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|
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// Add capability check |
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if (!current_user_can('upload_files')) { |
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wp_send_json_error(array( |
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'message' => esc_html__('Insufficient permissions to upload files.', 'king-addons'), |
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)); |
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} |
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|
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$max_file_size = isset($_POST['max_file_size']) ? floatval(sanitize_text_field($_POST['max_file_size'])) : 0; |
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if ($max_file_size <= 0) { |
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$max_file_size = wp_max_upload_size() / pow(1024, 2); |
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} |
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|
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if (isset($_FILES['uploaded_file'])) { |
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$file = $_FILES['uploaded_file']; |
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|
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if ($file['size'] > $max_file_size * 1024 * 1024) { |
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wp_send_json_error(array( |
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'cause' => 'filesize', |
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'sizes' => [ |
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$max_file_size * 1024 * 1024, |
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$file['size'] |
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], |
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'message' => 'File size exceeds the allowed limit.' |
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)); |
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} |
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|
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if (!$this->file_validity($file)) { |
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wp_send_json_error(array( |
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'cause' => 'filetype', |
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'message' => esc_html__('File type is not valid.', 'king-addons') |
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)); |
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} |
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|
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// Additional MIME type validation |
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$allowed_mime_types = [ |
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'image/jpeg', 'image/jpg', 'image/png', 'image/gif', |
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'application/pdf', 'application/msword', 'application/vnd.openxmlformats-officedocument.wordprocessingml.document', |
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'application/vnd.ms-powerpoint', 'application/vnd.openxmlformats-officedocument.presentationml.presentation', |
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'application/vnd.oasis.opendocument.text', 'video/avi', 'audio/ogg', 'video/mp4', 'audio/mp3', |
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'video/mpeg', 'audio/wav', 'video/x-ms-wmv', 'text/plain' |
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]; |
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|
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if (!in_array($file['type'], $allowed_mime_types)) { |
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wp_send_json_error(array( |
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'cause' => 'mime_type', |
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'message' => esc_html__('File MIME type is not allowed.', 'king-addons') |
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)); |
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} |
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|
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// Security check: Scan file content for malicious patterns |
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if (!$this->is_file_safe($file['tmp_name'])) { |
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wp_send_json_error(array( |
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'cause' => 'security', |
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'message' => esc_html__('File contains potentially malicious content.', 'king-addons') |
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)); |
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} |
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|
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if ('click' == $_POST['triggering_event']) { |
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$upload_dir = wp_upload_dir(); |
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$upload_path = $upload_dir['basedir'] . '/king-addons/forms'; |
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|
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wp_mkdir_p($upload_path); |
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|
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$filename = wp_unique_filename($upload_path, $file['name']); |
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|
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if (move_uploaded_file($file['tmp_name'], $upload_path . '/' . $filename)) { |
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wp_send_json_success(array( |
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'url' => $upload_dir['baseurl'] . '/king-addons/forms/' . $filename |
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)); |
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} else { |
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wp_send_json_error(array( |
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'message' => esc_html__('Failed to upload the file.', 'king-addons') |
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)); |
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} |
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} else { |
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wp_send_json_success(array( |
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'message' => esc_html__('File validation passed', 'king-addons') |
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)); |
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} |
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} |
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|
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if ('click' == $_POST['triggering_event']) { |
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|
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$upload_dir = wp_upload_dir(); |
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$upload_path = $upload_dir['basedir'] . '/king-addons/forms'; |
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|
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wp_mkdir_p($upload_path); |
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|
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wp_send_json_error(array( |
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'message' => esc_html__('No file was uploaded.', 'king-addons'), |
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'files' => $_FILES['uploaded_file'] |
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)); |
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} |
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} |
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|
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private function file_validity($file) |
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{ |
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$whitelist = ['jpg', 'jpeg', 'png', 'gif', 'pdf', 'doc', 'docx', 'ppt', 'pptx', 'odt', 'avi', 'ogg', 'm4a', 'mov', 'mp3', 'mp4', 'mpg', 'wav', 'wmv', 'txt']; |
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|
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if (empty($_POST['allowed_file_types'])) { |
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$allowed_file_types = 'jpg,jpeg,png,gif,pdf,doc,docx,ppt,pptx,odt,avi,ogg,m4a,mov,mp3,mp4,mpg,wav,wmv,txt'; |
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} else { |
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$allowed_file_types = $_POST['allowed_file_types']; |
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} |
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|
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if (!wp_check_filetype($file['name'])['ext']) { |
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return false; |
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} |
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|
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$f_extension = pathinfo($file['name'], PATHINFO_EXTENSION); |
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$f_extension = strtolower($f_extension); |
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|
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$allowed_file_types = explode(',', $allowed_file_types); |
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$allowed_file_types = array_map('trim', $allowed_file_types); |
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$allowed_file_types = array_map('strtolower', $allowed_file_types); |
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|
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return (in_array($f_extension, $allowed_file_types) && in_array($f_extension, $whitelist) && !in_array($f_extension, $this->get_exclusion_list())); |
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} |
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|
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private function get_exclusion_list() |
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{ |
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static $exclusionlist = false; |
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if (!$exclusionlist) { |
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$exclusionlist = [ |
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'php', |
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'php3', |
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'php4', |
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'php5', |
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'php6', |
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'phps', |
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'php7', |
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'phtml', |
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'shtml', |
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'pht', |
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'swf', |
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'html', |
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'asp', |
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'aspx', |
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'cmd', |
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'csh', |
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'bat', |
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'htm', |
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'hta', |
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'jar', |
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'exe', |
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'com', |
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'js', |
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'lnk', |
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'htaccess', |
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'htpasswd', |
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'phtml', |
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'ps1', |
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'ps2', |
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'py', |
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'rb', |
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'tmp', |
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'cgi', |
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'svg', |
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'svgz' |
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]; |
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} |
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|
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return $exclusionlist; |
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} |
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|
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/** |
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* Check if uploaded file is safe from malicious content |
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* |
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* @param string $file_path Path to the uploaded file |
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* @return bool True if file is safe, false if potentially malicious |
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*/ |
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private function is_file_safe($file_path) |
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{ |
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// Only check text-based files for malicious content |
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$text_mime_types = ['text/plain', 'application/json', 'text/html', 'text/css', 'text/javascript']; |
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|
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if (!in_array($this->get_file_mime_type($file_path), $text_mime_types)) { |
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return true; // Non-text files are considered safe for this check |
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} |
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|
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if (!file_exists($file_path)) { |
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return false; |
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} |
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|
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$content = file_get_contents($file_path); |
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if ($content === false) { |
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return false; |
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} |
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|
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// Check for common malicious patterns |
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$malicious_patterns = [ |
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'/<\?php/i', // PHP opening tag |
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'/eval\s*\(/i', // eval() function |
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'/base64_decode/i', // Base64 decode |
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'/system\s*\(/i', // system() function |
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'/exec\s*\(/i', // exec() function |
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'/shell_exec/i', // shell_exec function |
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'/passthru/i', // passthru function |
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'/<\?=/i', // PHP short tag |
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'/<script/i', // JavaScript tags |
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'/javascript:/i', // JavaScript protocol |
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'/on\w+\s*=/i', // Event handlers |
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]; |
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|
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foreach ($malicious_patterns as $pattern) { |
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if (preg_match($pattern, $content)) { |
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return false; |
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} |
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} |
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|
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return true; |
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} |
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|
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/** |
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* Get file MIME type from file path |
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* |
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* @param string $file_path Path to the file |
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* @return string MIME type |
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*/ |
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private function get_file_mime_type($file_path) |
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{ |
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$finfo = finfo_open(FILEINFO_MIME_TYPE); |
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$mime_type = finfo_file($finfo, $file_path); |
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finfo_close($finfo); |
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return $mime_type; |
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} |
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|
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/** |
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* AJAX handler for generating fresh nonce |
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* Security fix: Provides dynamic nonce generation instead of public exposure |
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*/ |
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public function get_fresh_nonce() |
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{ |
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// Only allow if user has upload permissions or if it's a public form |
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if (!current_user_can('upload_files') && !isset($_POST['form_public'])) { |
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wp_send_json_error(['message' => 'Insufficient permissions']); |
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} |
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|
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wp_send_json_success([ |
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'nonce' => wp_create_nonce('king-addons-js'), |
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'timestamp' => time() |
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]); |
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} |
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} |
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|
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new Upload_Email_File(); |
