class-form-access-control.php
2 months ago
class-form-captcha-handler.php
2 months ago
class-form-controller.php
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class-form-email-config-check.php
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class-form-email-handler.php
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class-form-encryption.php
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class-form-exporter.php
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class-form-field-validator.php
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class-form-file-handler.php
2 months ago
class-form-google-auth.php
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class-form-integration-handler.php
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class-form-math-parser.php
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class-form-permissions.php
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class-form-registry.php
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class-form-settings.php
2 months ago
class-form-submission-cpt.php
2 months ago
class-form-submission-handler.php
2 months ago
class-form-file-handler.php
401 lines
| 1 | <?php |
| 2 | |
| 3 | namespace SuperbAddons\Gutenberg\Form; |
| 4 | |
| 5 | defined('ABSPATH') || exit(); |
| 6 | |
| 7 | class FormFileHandler |
| 8 | { |
| 9 | const UPLOAD_SUBDIR = 'superb-addons-forms'; |
| 10 | |
| 11 | /** |
| 12 | * Validate uploaded files for a field against its config. |
| 13 | * Called by FormFieldValidator before files are processed. |
| 14 | * |
| 15 | * @param array $field_config Field configuration from server-side config |
| 16 | * @return string Error message, empty if valid |
| 17 | */ |
| 18 | public static function ValidateFiles($field_config) |
| 19 | { |
| 20 | $field_id = isset($field_config['fieldId']) ? $field_config['fieldId'] : ''; |
| 21 | $required = !empty($field_config['required']); |
| 22 | $fs = isset($field_config['fileSettings']) && is_array($field_config['fileSettings']) ? $field_config['fileSettings'] : array(); |
| 23 | $max_file_size = isset($fs['maxFileSize']) ? floatval($fs['maxFileSize']) : 5; |
| 24 | $multiple = !empty($fs['multiple']); |
| 25 | $max_files = isset($fs['maxFiles']) ? intval($fs['maxFiles']) : 5; |
| 26 | $accept = isset($fs['accept']) && is_array($fs['accept']) ? $fs['accept'] : array(); |
| 27 | |
| 28 | // Check if files were submitted for this field |
| 29 | $files = self::GetUploadedFiles($field_id); |
| 30 | |
| 31 | if (empty($files)) { |
| 32 | // Conditional logic: if field has active rules, skip required check |
| 33 | // (handled by FormFieldValidator before calling us, but guard here too) |
| 34 | if ($required) { |
| 35 | $logic = isset($field_config['conditionalLogic']) ? $field_config['conditionalLogic'] : null; |
| 36 | if ($logic && isset($logic['ruleGroups']) && is_array($logic['ruleGroups'])) { |
| 37 | foreach ($logic['ruleGroups'] as $group) { |
| 38 | if (isset($group['conditions']) && is_array($group['conditions'])) { |
| 39 | foreach ($group['conditions'] as $cond) { |
| 40 | if (!empty($cond['field'])) { |
| 41 | return ''; |
| 42 | } |
| 43 | } |
| 44 | } |
| 45 | } |
| 46 | } |
| 47 | return __('This field is required.', 'superb-blocks'); |
| 48 | } |
| 49 | return ''; |
| 50 | } |
| 51 | |
| 52 | // Validate file count |
| 53 | if (!$multiple && count($files) > 1) { |
| 54 | return __('Only one file is allowed.', 'superb-blocks'); |
| 55 | } |
| 56 | if ($multiple && count($files) > $max_files) { |
| 57 | /* translators: %d: maximum number of files allowed for this field */ |
| 58 | return sprintf(__('Maximum %d files allowed.', 'superb-blocks'), $max_files); |
| 59 | } |
| 60 | |
| 61 | // Validate each file |
| 62 | $max_bytes = $max_file_size * 1024 * 1024; |
| 63 | foreach ($files as $file) { |
| 64 | // Check for upload errors |
| 65 | if (!empty($file['error']) && intval($file['error']) !== UPLOAD_ERR_OK) { |
| 66 | return __('File upload failed.', 'superb-blocks'); |
| 67 | } |
| 68 | |
| 69 | // Unconditional deny-list: reject dangerous extensions regardless of the |
| 70 | // per-field accept whitelist. Catches misconfigured accept[] entries and |
| 71 | // double-extension filenames (e.g. shell.php.jpg) before any further check. |
| 72 | if (!empty($file['name']) && self::HasDangerousExtension($file['name'])) { |
| 73 | return __('File type is not allowed.', 'superb-blocks'); |
| 74 | } |
| 75 | |
| 76 | // Validate size |
| 77 | if (isset($file['size']) && $file['size'] > $max_bytes) { |
| 78 | /* translators: %s: maximum file size in megabytes */ |
| 79 | return sprintf(__('File size exceeds %sMB.', 'superb-blocks'), $max_file_size); |
| 80 | } |
| 81 | |
| 82 | // Validate MIME type / extension |
| 83 | if (!empty($accept) && !empty($file['name'])) { |
| 84 | $ext = '.' . strtolower(pathinfo($file['name'], PATHINFO_EXTENSION)); |
| 85 | $allowed = false; |
| 86 | foreach ($accept as $accepted) { |
| 87 | // Accept list entries are like ".jpg", ".pdf", etc. |
| 88 | if (strtolower(trim($accepted)) === $ext) { |
| 89 | $allowed = true; |
| 90 | break; |
| 91 | } |
| 92 | } |
| 93 | if (!$allowed) { |
| 94 | return __('File type is not allowed.', 'superb-blocks'); |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | // Additional MIME validation using WordPress |
| 99 | if (!empty($file['tmp_name']) && !empty($file['name'])) { |
| 100 | $wp_filetype = wp_check_filetype($file['name']); |
| 101 | if (empty($wp_filetype['ext']) || empty($wp_filetype['type'])) { |
| 102 | return __('File type is not allowed.', 'superb-blocks'); |
| 103 | } |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | return ''; |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Process and store uploaded files for a submission. |
| 112 | * |
| 113 | * @param array $form_fields_config Array of field config arrays |
| 114 | * @return array fieldId => array of file metadata arrays |
| 115 | */ |
| 116 | public static function ProcessUploads($form_fields_config) |
| 117 | { |
| 118 | // Nonce verified upstream by FormController::SubmitCallback before this method runs; presence check only, no value processed here. |
| 119 | // phpcs:ignore WordPress.Security.NonceVerification.Missing |
| 120 | if (empty($_FILES['files'])) { |
| 121 | return array(); |
| 122 | } |
| 123 | |
| 124 | require_once(ABSPATH . 'wp-admin/includes/file.php'); |
| 125 | |
| 126 | $result = array(); |
| 127 | |
| 128 | // Build lookup for file field configs |
| 129 | $file_field_configs = array(); |
| 130 | foreach ($form_fields_config as $fc) { |
| 131 | $ftype = isset($fc['fieldType']) ? $fc['fieldType'] : ''; |
| 132 | $fid = isset($fc['fieldId']) ? $fc['fieldId'] : ''; |
| 133 | if ($ftype === 'file' && $fid !== '') { |
| 134 | $file_field_configs[$fid] = $fc; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | foreach ($file_field_configs as $field_id => $config) { |
| 139 | $files = self::GetUploadedFiles($field_id); |
| 140 | if (empty($files)) { |
| 141 | continue; |
| 142 | } |
| 143 | |
| 144 | $field_files = array(); |
| 145 | foreach ($files as $file) { |
| 146 | if (empty($file['tmp_name']) || intval($file['error']) !== UPLOAD_ERR_OK) { |
| 147 | continue; |
| 148 | } |
| 149 | |
| 150 | // Hook into upload_dir to redirect to our protected directory |
| 151 | $dir_filter = function ($dirs) { |
| 152 | $subdir = '/' . self::UPLOAD_SUBDIR . $dirs['subdir']; |
| 153 | $dirs['subdir'] = $subdir; |
| 154 | $dirs['path'] = $dirs['basedir'] . $subdir; |
| 155 | $dirs['url'] = $dirs['baseurl'] . $subdir; |
| 156 | return $dirs; |
| 157 | }; |
| 158 | add_filter('upload_dir', $dir_filter); |
| 159 | |
| 160 | // Ensure protected directory exists |
| 161 | self::EnsureUploadDir(); |
| 162 | |
| 163 | $uploaded = wp_handle_upload($file, array( |
| 164 | 'test_form' => false, |
| 165 | 'action' => 'superb_form_upload', |
| 166 | )); |
| 167 | |
| 168 | remove_filter('upload_dir', $dir_filter); |
| 169 | |
| 170 | if (!empty($uploaded['file'])) { |
| 171 | $field_files[] = array( |
| 172 | 'name' => sanitize_file_name($file['name']), |
| 173 | 'path' => $uploaded['file'], |
| 174 | 'url' => isset($uploaded['url']) ? $uploaded['url'] : '', |
| 175 | 'type' => isset($uploaded['type']) ? $uploaded['type'] : '', |
| 176 | 'size' => $file['size'], |
| 177 | ); |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | if (!empty($field_files)) { |
| 182 | $result[$field_id] = $field_files; |
| 183 | |
| 184 | /** |
| 185 | * Fires after files are uploaded for a form field. |
| 186 | * |
| 187 | * @param string $field_id The field ID. |
| 188 | * @param array $field_files Array of file metadata. |
| 189 | * @param array $config Field configuration. |
| 190 | */ |
| 191 | do_action('superbaddons_form_after_upload', $field_id, $field_files, $config); |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | return $result; |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * Delete all files associated with a submission's field data. |
| 200 | * |
| 201 | * @param array $fields Submission fields (field_id => value) |
| 202 | */ |
| 203 | public static function DeleteSubmissionFiles($fields) |
| 204 | { |
| 205 | if (!is_array($fields)) { |
| 206 | return; |
| 207 | } |
| 208 | |
| 209 | foreach ($fields as $value) { |
| 210 | // File fields store an array of file metadata |
| 211 | if (!is_array($value)) { |
| 212 | continue; |
| 213 | } |
| 214 | |
| 215 | foreach ($value as $file) { |
| 216 | if (is_array($file) && isset($file['path']) && file_exists($file['path'])) { |
| 217 | wp_delete_file($file['path']); |
| 218 | } |
| 219 | } |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * Serve a file from the protected upload directory. |
| 225 | * Streams the file with appropriate headers and exits. |
| 226 | * |
| 227 | * @param string $file_path Absolute path to the file |
| 228 | * @param string $original_name Original file name for download |
| 229 | * @param string $mime_type MIME type |
| 230 | */ |
| 231 | public static function ServeFile($file_path, $original_name, $mime_type) |
| 232 | { |
| 233 | if (!file_exists($file_path) || !is_readable($file_path)) { |
| 234 | return new \WP_REST_Response(array( |
| 235 | 'success' => false, |
| 236 | 'message' => __('File not found.', 'superb-blocks'), |
| 237 | ), 404); |
| 238 | } |
| 239 | |
| 240 | // Ensure file is within our upload directory |
| 241 | $upload_dir = wp_upload_dir(); |
| 242 | $allowed_base = $upload_dir['basedir'] . '/' . self::UPLOAD_SUBDIR; |
| 243 | $real_path = realpath($file_path); |
| 244 | $real_base = realpath($allowed_base); |
| 245 | |
| 246 | if ($real_path === false || $real_base === false || strpos($real_path, $real_base) !== 0) { |
| 247 | return new \WP_REST_Response(array( |
| 248 | 'success' => false, |
| 249 | 'message' => __('Access denied.', 'superb-blocks'), |
| 250 | ), 403); |
| 251 | } |
| 252 | |
| 253 | $safe_name = str_replace(array('"', "\r", "\n"), '', sanitize_file_name($original_name)); |
| 254 | header('Content-Type: ' . $mime_type); |
| 255 | header('Content-Disposition: attachment; filename="' . $safe_name . '"'); |
| 256 | header('Content-Length: ' . filesize($file_path)); |
| 257 | header('Cache-Control: no-store, no-cache, must-revalidate'); |
| 258 | |
| 259 | // phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_readfile |
| 260 | readfile($file_path); |
| 261 | wp_die(); |
| 262 | } |
| 263 | |
| 264 | /** |
| 265 | * Check if a filename has a dangerous extension in any dot-separated segment. |
| 266 | * Catches single (shell.php), double-extension (shell.php.jpg), and dotfile |
| 267 | * (.htaccess) cases. Server-config and active-content extensions are denied |
| 268 | * because the upload subdir is web-reachable on IIS/Nginx where .htaccess is |
| 269 | * ignored, so a stored .html or .svg could host an XSS payload even though |
| 270 | * wp_handle_upload would not save a .php file under an unauthenticated request. |
| 271 | * |
| 272 | * @param string $filename |
| 273 | * @return bool |
| 274 | */ |
| 275 | private static function HasDangerousExtension($filename) |
| 276 | { |
| 277 | static $deny = array( |
| 278 | // PHP and PHP-handler variants |
| 279 | 'php', 'php3', 'php4', 'php5', 'php7', 'php8', 'phtml', 'pht', 'phar', 'phps', |
| 280 | // Other server-side scripting |
| 281 | 'cgi', 'pl', 'py', 'rb', 'jsp', 'jspx', 'asp', 'aspx', 'cer', 'cfm', 'shtml', |
| 282 | // Executables and shells |
| 283 | 'exe', 'msi', 'sh', 'bat', 'cmd', 'com', 'vb', 'vbs', 'wsh', |
| 284 | // Server config |
| 285 | 'htaccess', 'htpasswd', 'ini', 'env', |
| 286 | // Active web content (inline XSS if directly accessible) |
| 287 | 'html', 'htm', 'xhtml', 'svg', 'svgz', 'js', 'mjs', 'xml', |
| 288 | ); |
| 289 | |
| 290 | $parts = explode('.', strtolower($filename)); |
| 291 | array_shift($parts); // skip basename, only inspect dot-segments |
| 292 | foreach ($parts as $part) { |
| 293 | if ($part !== '' && in_array($part, $deny, true)) { |
| 294 | return true; |
| 295 | } |
| 296 | } |
| 297 | return false; |
| 298 | } |
| 299 | |
| 300 | /** |
| 301 | * Get uploaded files for a specific field ID from $_FILES. |
| 302 | * Normalizes the PHP $_FILES array for multiple files. |
| 303 | * |
| 304 | * @param string $field_id |
| 305 | * @return array Array of file arrays (name, type, tmp_name, error, size) |
| 306 | */ |
| 307 | private static function GetUploadedFiles($field_id) |
| 308 | { |
| 309 | // Nonce verified upstream by FormController::SubmitCallback before any caller of this method runs. |
| 310 | // PHP guarantees the parallel name/type/tmp_name/error/size keys exist together when $_FILES['files']['name'][$field_id] is set, so checking the others would be redundant. |
| 311 | // Raw $_FILES values are consumed downstream by wp_handle_upload() (which applies WP's standard upload sanitization) and sanitize_file_name() at storage time; running sanitize_text_field on tmp_name/size/error here would corrupt the values wp_handle_upload expects. |
| 312 | // phpcs:disable WordPress.Security.NonceVerification.Missing, WordPress.Security.ValidatedSanitizedInput.InputNotValidated, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized |
| 313 | if (empty($_FILES['files']) || !isset($_FILES['files']['name'][$field_id])) { |
| 314 | return array(); |
| 315 | } |
| 316 | |
| 317 | $files = array(); |
| 318 | $names = $_FILES['files']['name'][$field_id]; |
| 319 | $types = $_FILES['files']['type'][$field_id]; |
| 320 | $tmp_names = $_FILES['files']['tmp_name'][$field_id]; |
| 321 | $errors = $_FILES['files']['error'][$field_id]; |
| 322 | $sizes = $_FILES['files']['size'][$field_id]; |
| 323 | // phpcs:enable WordPress.Security.NonceVerification.Missing, WordPress.Security.ValidatedSanitizedInput.InputNotValidated, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized |
| 324 | |
| 325 | // Normalize: could be a single file or array of files |
| 326 | if (is_array($names)) { |
| 327 | for ($i = 0; $i < count($names); $i++) { |
| 328 | if (empty($names[$i])) { |
| 329 | continue; |
| 330 | } |
| 331 | $files[] = array( |
| 332 | 'name' => $names[$i], |
| 333 | 'type' => $types[$i], |
| 334 | 'tmp_name' => $tmp_names[$i], |
| 335 | 'error' => $errors[$i], |
| 336 | 'size' => $sizes[$i], |
| 337 | ); |
| 338 | } |
| 339 | } else { |
| 340 | if (!empty($names)) { |
| 341 | $files[] = array( |
| 342 | 'name' => $names, |
| 343 | 'type' => $types, |
| 344 | 'tmp_name' => $tmp_names, |
| 345 | 'error' => $errors, |
| 346 | 'size' => $sizes, |
| 347 | ); |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | return $files; |
| 352 | } |
| 353 | |
| 354 | /** |
| 355 | * Ensure the protected upload directory exists with .htaccess and index.php. |
| 356 | */ |
| 357 | private static function EnsureUploadDir() |
| 358 | { |
| 359 | $upload_dir = wp_upload_dir(); |
| 360 | $base_path = $upload_dir['basedir'] . '/' . self::UPLOAD_SUBDIR; |
| 361 | |
| 362 | // Create base directory if needed |
| 363 | if (!is_dir($base_path)) { |
| 364 | wp_mkdir_p($base_path); |
| 365 | } |
| 366 | |
| 367 | // Use WP_Filesystem for file writes (required by plugin review guidelines) |
| 368 | global $wp_filesystem; |
| 369 | if (empty($wp_filesystem)) { |
| 370 | require_once(ABSPATH . 'wp-admin/includes/file.php'); |
| 371 | WP_Filesystem(); |
| 372 | } |
| 373 | |
| 374 | // Create .htaccess to deny direct access (Apache) |
| 375 | $htaccess = $base_path . '/.htaccess'; |
| 376 | if (!file_exists($htaccess)) { |
| 377 | $wp_filesystem->put_contents($htaccess, "# Deny direct access to uploaded form files\n<IfModule mod_authz_core.c>\n Require all denied\n</IfModule>\n<IfModule !mod_authz_core.c>\n Order deny,allow\n Deny from all\n</IfModule>\n", FS_CHMOD_FILE); |
| 378 | } |
| 379 | |
| 380 | // Create web.config to deny direct access (IIS). accessPolicy="None" |
| 381 | // strips Read/Script/Execute so any request to this dir returns 403, |
| 382 | // mirroring the Apache "Require all denied" posture above. |
| 383 | $webconfig = $base_path . '/web.config'; |
| 384 | if (!file_exists($webconfig)) { |
| 385 | $wp_filesystem->put_contents($webconfig, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<configuration>\n <system.webServer>\n <handlers accessPolicy=\"None\" />\n </system.webServer>\n</configuration>\n", FS_CHMOD_FILE); |
| 386 | } |
| 387 | |
| 388 | // Create index.php to prevent directory listing |
| 389 | $index = $base_path . '/index.php'; |
| 390 | if (!file_exists($index)) { |
| 391 | $wp_filesystem->put_contents($index, "<?php\n// Silence is golden.\n", FS_CHMOD_FILE); |
| 392 | } |
| 393 | |
| 394 | // Also protect the current year/month subdirectory |
| 395 | $current_path = $upload_dir['path']; |
| 396 | if (strpos($current_path, $base_path) === 0 && !is_dir($current_path)) { |
| 397 | wp_mkdir_p($current_path); |
| 398 | } |
| 399 | } |
| 400 | } |
| 401 |