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| 1 | <?php |
| 2 | /** |
| 3 | * |
| 4 | * This file is part of the phpBB Forum Software package. |
| 5 | * |
| 6 | * @copyright (c) phpBB Limited <https://www.phpbb.com> |
| 7 | * @license GNU General Public License, version 2 (GPL-2.0) |
| 8 | * |
| 9 | * For full copyright and license information, please see |
| 10 | * the docs/CREDITS.txt file. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | namespace phpbb\storage\controller; |
| 15 | |
| 16 | use phpbb\attachment\attachment_category; |
| 17 | use phpbb\auth\auth; |
| 18 | use phpbb\cache\service; |
| 19 | use phpbb\config\config; |
| 20 | use phpbb\content_visibility; |
| 21 | use phpbb\db\driver\driver_interface; |
| 22 | use phpbb\event\dispatcher_interface; |
| 23 | use phpbb\exception\http_exception; |
| 24 | use phpbb\language\language; |
| 25 | use phpbb\mimetype\extension_guesser; |
| 26 | use phpbb\request\request; |
| 27 | use phpbb\storage\storage; |
| 28 | use phpbb\user; |
| 29 | use Symfony\Component\HttpFoundation\Request as symfony_request; |
| 30 | use Symfony\Component\HttpFoundation\RedirectResponse; |
| 31 | use Symfony\Component\HttpFoundation\Response; |
| 32 | use Symfony\Component\HttpFoundation\ResponseHeaderBag; |
| 33 | use Symfony\Component\HttpFoundation\StreamedResponse; |
| 34 | |
| 35 | /** |
| 36 | * Controller for /download/attachment/{id} routes |
| 37 | */ |
| 38 | class attachment extends controller |
| 39 | { |
| 40 | /** @var auth */ |
| 41 | protected $auth; |
| 42 | |
| 43 | /** @var config */ |
| 44 | protected $config; |
| 45 | |
| 46 | /** @var content_visibility */ |
| 47 | protected $content_visibility; |
| 48 | |
| 49 | /** @var dispatcher_interface */ |
| 50 | protected $dispatcher; |
| 51 | |
| 52 | /** @var language */ |
| 53 | protected $language; |
| 54 | |
| 55 | /** @var request */ |
| 56 | protected $request; |
| 57 | |
| 58 | /** @var user */ |
| 59 | protected $user; |
| 60 | |
| 61 | /** |
| 62 | * Constructor |
| 63 | * |
| 64 | * @param auth $auth |
| 65 | * @param service $cache |
| 66 | * @param config $config |
| 67 | * @param content_visibility $content_visibility |
| 68 | * @param driver_interface $db |
| 69 | * @param dispatcher_interface $dispatcher |
| 70 | * @param extension_guesser $extension_guesser |
| 71 | * @param language $language |
| 72 | * @param request $request |
| 73 | * @param storage $storage |
| 74 | * @param symfony_request $symfony_request |
| 75 | * @param user $user |
| 76 | */ |
| 77 | public function __construct(auth $auth, service $cache, config $config, content_visibility $content_visibility, driver_interface $db, dispatcher_interface $dispatcher, extension_guesser $extension_guesser, language $language, request $request, storage $storage, symfony_request $symfony_request, user $user) |
| 78 | { |
| 79 | parent::__construct($cache, $db, $extension_guesser, $storage, $symfony_request); |
| 80 | |
| 81 | $this->auth = $auth; |
| 82 | $this->config = $config; |
| 83 | $this->content_visibility = $content_visibility; |
| 84 | $this->dispatcher = $dispatcher; |
| 85 | $this->language = $language; |
| 86 | $this->request = $request; |
| 87 | $this->user = $user; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Handle attachments |
| 92 | * |
| 93 | * @param int $id File ID |
| 94 | * @param string $filename Filename |
| 95 | */ |
| 96 | public function handle_attachment(int $id, string $filename): Response |
| 97 | { |
| 98 | $attach_id = $id; |
| 99 | $thumbnail = $this->request->variable('t', false); |
| 100 | |
| 101 | $this->language->add_lang('viewtopic'); |
| 102 | |
| 103 | if (!$this->config['allow_attachments'] && !$this->config['allow_pm_attach']) |
| 104 | { |
| 105 | throw new http_exception(404, 'ATTACHMENT_FUNCTIONALITY_DISABLED'); |
| 106 | } |
| 107 | |
| 108 | if (!$attach_id) |
| 109 | { |
| 110 | throw new http_exception(404, 'NO_ATTACHMENT_SELECTED'); |
| 111 | } |
| 112 | |
| 113 | $sql = 'SELECT attach_id, post_msg_id, topic_id, in_message, poster_id, |
| 114 | is_orphan, physical_filename, real_filename, extension, mimetype, |
| 115 | filesize, filetime |
| 116 | FROM ' . ATTACHMENTS_TABLE . " |
| 117 | WHERE attach_id = $attach_id" . |
| 118 | (($filename) ? " AND real_filename = '" . $this->db->sql_escape($filename) . "'" : ''); |
| 119 | $result = $this->db->sql_query($sql); |
| 120 | $attachment = $this->db->sql_fetchrow($result); |
| 121 | $this->db->sql_freeresult($result); |
| 122 | |
| 123 | if (!$attachment) |
| 124 | { |
| 125 | throw new http_exception(404, 'ERROR_NO_ATTACHMENT'); |
| 126 | } |
| 127 | else if (!$this->download_allowed()) |
| 128 | { |
| 129 | throw new http_exception(403, 'LINKAGE_FORBIDDEN'); |
| 130 | } |
| 131 | |
| 132 | $attachment['physical_filename'] = utf8_basename($attachment['physical_filename']); |
| 133 | |
| 134 | if ((!$attachment['in_message'] && !$this->config['allow_attachments']) || |
| 135 | ($attachment['in_message'] && !$this->config['allow_pm_attach'])) |
| 136 | { |
| 137 | throw new http_exception(404, 'ATTACHMENT_FUNCTIONALITY_DISABLED'); |
| 138 | } |
| 139 | |
| 140 | if ($attachment['is_orphan']) |
| 141 | { |
| 142 | // We allow admins having attachment permissions to see orphan attachments... |
| 143 | $own_attachment = $this->auth->acl_get('a_attach') || $attachment['poster_id'] == $this->user->data['user_id']; |
| 144 | |
| 145 | if (!$own_attachment || ($attachment['in_message'] && !$this->auth->acl_get('u_pm_download')) || |
| 146 | (!$attachment['in_message'] && !$this->auth->acl_get('u_download'))) |
| 147 | { |
| 148 | throw new http_exception(404, 'ERROR_NO_ATTACHMENT'); |
| 149 | } |
| 150 | |
| 151 | // Obtain all extensions... |
| 152 | $extensions = $this->cache->obtain_attach_extensions(true); |
| 153 | } |
| 154 | else |
| 155 | { |
| 156 | if (!$attachment['in_message']) |
| 157 | { |
| 158 | $this->phpbb_download_handle_forum_auth($attachment['topic_id']); |
| 159 | |
| 160 | $sql = 'SELECT forum_id, poster_id, post_visibility |
| 161 | FROM ' . POSTS_TABLE . ' |
| 162 | WHERE post_id = ' . (int) $attachment['post_msg_id']; |
| 163 | $result = $this->db->sql_query($sql); |
| 164 | $post_row = $this->db->sql_fetchrow($result); |
| 165 | $this->db->sql_freeresult($result); |
| 166 | |
| 167 | if (!$post_row || !$this->content_visibility->is_visible('post', $post_row['forum_id'], $post_row)) |
| 168 | { |
| 169 | // Attachment of a soft deleted post and the user is not allowed to see the post |
| 170 | throw new http_exception(404, 'ERROR_NO_ATTACHMENT'); |
| 171 | } |
| 172 | } |
| 173 | else |
| 174 | { |
| 175 | // Attachment is in a private message. |
| 176 | $post_row = array('forum_id' => false); |
| 177 | $this->phpbb_download_handle_pm_auth( $attachment['post_msg_id']); |
| 178 | } |
| 179 | |
| 180 | $extensions = array(); |
| 181 | if (!extension_allowed($post_row['forum_id'], $attachment['extension'], $extensions)) |
| 182 | { |
| 183 | throw new http_exception(403, 'EXTENSION_DISABLED_AFTER_POSTING', [$attachment['extension']]); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | $display_cat = $extensions[$attachment['extension']]['display_cat']; |
| 188 | |
| 189 | if ($thumbnail) |
| 190 | { |
| 191 | $attachment['physical_filename'] = 'thumb_' . $attachment['physical_filename']; |
| 192 | } |
| 193 | else if ($display_cat == attachment_category::NONE && !$attachment['is_orphan']) |
| 194 | { |
| 195 | if (!(($display_cat == attachment_category::IMAGE || $display_cat == attachment_category::THUMB) && !$this->user->optionget('viewimg'))) |
| 196 | { |
| 197 | // Update download count |
| 198 | $this->phpbb_increment_downloads($attachment['attach_id']); |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | $redirect = ''; |
| 203 | |
| 204 | /** |
| 205 | * Event to modify data before sending file to browser |
| 206 | * |
| 207 | * @event core.download_file_send_to_browser_before |
| 208 | * @var int attach_id The attachment ID |
| 209 | * @var array attachment Array with attachment data |
| 210 | * @var array extensions Array with file extensions data |
| 211 | * @var bool thumbnail Flag indicating if the file is a thumbnail |
| 212 | * @var string redirect Do a redirection instead of reading the file |
| 213 | * @since 3.1.6-RC1 |
| 214 | * @changed 3.1.7-RC1 Fixing wrong name of a variable (replacing "extension" by "extensions") |
| 215 | * @changed 3.3.0-a1 Add redirect variable |
| 216 | * @changed 3.3.0-a1 Remove display_cat variable |
| 217 | * @changed 3.3.0-a1 Remove mode variable |
| 218 | */ |
| 219 | $vars = array( |
| 220 | 'attach_id', |
| 221 | 'attachment', |
| 222 | 'extensions', |
| 223 | 'thumbnail', |
| 224 | 'redirect', |
| 225 | ); |
| 226 | extract($this->dispatcher->trigger_event('core.download_file_send_to_browser_before', compact($vars))); |
| 227 | |
| 228 | // If the redirect variable have been overwritten, do redirect there |
| 229 | if (!empty($redirect)) |
| 230 | { |
| 231 | return new RedirectResponse($redirect); |
| 232 | } |
| 233 | |
| 234 | // Check if the file exists in the storage table too |
| 235 | if (!$this->storage->exists($attachment['physical_filename'])) |
| 236 | { |
| 237 | throw new http_exception(404, 'ERROR_NO_ATTACHMENT'); |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * Event to alter attachment before it is sent to browser. |
| 242 | * |
| 243 | * @event core.send_file_to_browser_before |
| 244 | * @var array attachment Attachment data |
| 245 | * @since 3.1.11-RC1 |
| 246 | * @changed 3.3.0-a1 Removed category variable |
| 247 | * @changed 3.3.0-a1 Removed size variable |
| 248 | * @changed 3.3.0-a1 Removed filename variable |
| 249 | */ |
| 250 | $vars = array( |
| 251 | 'attachment', |
| 252 | ); |
| 253 | extract($this->dispatcher->trigger_event('core.send_file_to_browser_before', compact($vars))); |
| 254 | |
| 255 | // TODO: The next lines should go better in prepare, also the mimetype is handled by the storage table |
| 256 | // so probably can be removed |
| 257 | |
| 258 | $response = new StreamedResponse(); |
| 259 | |
| 260 | // Content-type header |
| 261 | $response->headers->set('Content-Type', $attachment['mimetype']); |
| 262 | |
| 263 | // Display file types in browser and force download for others |
| 264 | if (strpos($attachment['mimetype'], 'image') !== false |
| 265 | || strpos($attachment['mimetype'], 'audio') !== false |
| 266 | || strpos($attachment['mimetype'], 'video') !== false |
| 267 | ) |
| 268 | { |
| 269 | $disposition = $response->headers->makeDisposition( |
| 270 | ResponseHeaderBag::DISPOSITION_INLINE, |
| 271 | $attachment['real_filename'], |
| 272 | $this->filenameFallback($attachment['real_filename']) |
| 273 | ); |
| 274 | } |
| 275 | else |
| 276 | { |
| 277 | $disposition = $response->headers->makeDisposition( |
| 278 | ResponseHeaderBag::DISPOSITION_ATTACHMENT, |
| 279 | $attachment['real_filename'], |
| 280 | $this->filenameFallback($attachment['real_filename']) |
| 281 | ); |
| 282 | } |
| 283 | |
| 284 | $response->headers->set('Content-Disposition', $disposition); |
| 285 | |
| 286 | // Set expires header for browser cache |
| 287 | $time = new \DateTime(); |
| 288 | $response->setExpires($time->modify('+1 year')); |
| 289 | |
| 290 | return parent::handle($attachment['physical_filename']); |
| 291 | } |
| 292 | |
| 293 | /** |
| 294 | * Remove non valid characters https://github.com/symfony/http-foundation/commit/c7df9082ee7205548a97031683bc6550b5dc9551 |
| 295 | */ |
| 296 | protected function filenameFallback($filename) |
| 297 | { |
| 298 | $filename = preg_replace(['/[^\x20-\x7e]/', '/%/', '/\//', '/\\\\/'], '', $filename); |
| 299 | |
| 300 | return (!empty($filename)) ?: 'File'; |
| 301 | } |
| 302 | |
| 303 | /** |
| 304 | * {@inheritdoc} |
| 305 | */ |
| 306 | protected function prepare(StreamedResponse $response, string $file): void |
| 307 | { |
| 308 | $response->setPrivate(); // By default should be private, but make sure of it |
| 309 | |
| 310 | parent::prepare($response, $file); |
| 311 | } |
| 312 | |
| 313 | /** |
| 314 | * Handles authentication when downloading attachments from a post or topic |
| 315 | * |
| 316 | * @param int $topic_id The id of the topic that we are downloading from |
| 317 | * |
| 318 | * @return void |
| 319 | * @throws http_exception If attachment is not found |
| 320 | * If user don't have permission to download the attachment |
| 321 | */ |
| 322 | protected function phpbb_download_handle_forum_auth(int $topic_id): void |
| 323 | { |
| 324 | $sql_array = [ |
| 325 | 'SELECT' => 't.forum_id, t.topic_poster, t.topic_visibility, f.forum_name, f.forum_password, f.parent_id', |
| 326 | 'FROM' => [ |
| 327 | TOPICS_TABLE => 't', |
| 328 | FORUMS_TABLE => 'f', |
| 329 | ], |
| 330 | 'WHERE' => 't.topic_id = ' . (int) $topic_id . ' |
| 331 | AND t.forum_id = f.forum_id', |
| 332 | ]; |
| 333 | |
| 334 | $sql = $this->db->sql_build_query('SELECT', $sql_array); |
| 335 | $result = $this->db->sql_query($sql); |
| 336 | $row = $this->db->sql_fetchrow($result); |
| 337 | $this->db->sql_freeresult($result); |
| 338 | |
| 339 | if ($row && !$this->content_visibility->is_visible('topic', $row['forum_id'], $row)) |
| 340 | { |
| 341 | throw new http_exception(404, 'ERROR_NO_ATTACHMENT'); |
| 342 | } |
| 343 | else if ($row && $this->auth->acl_get('u_download') && $this->auth->acl_get('f_download', $row['forum_id'])) |
| 344 | { |
| 345 | if ($row['forum_password']) |
| 346 | { |
| 347 | // Do something else ... ? |
| 348 | login_forum_box($row); |
| 349 | } |
| 350 | } |
| 351 | else |
| 352 | { |
| 353 | throw new http_exception(403, 'SORRY_AUTH_VIEW_ATTACH'); |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | /** |
| 358 | * Handles authentication when downloading attachments from PMs |
| 359 | * |
| 360 | * @param int $msg_id The id of the PM that we are downloading from |
| 361 | * |
| 362 | * @return void |
| 363 | * @throws http_exception If attachment is not found |
| 364 | */ |
| 365 | protected function phpbb_download_handle_pm_auth(int $msg_id): void |
| 366 | { |
| 367 | if (!$this->auth->acl_get('u_pm_download')) |
| 368 | { |
| 369 | throw new http_exception(403, 'SORRY_AUTH_VIEW_ATTACH'); |
| 370 | } |
| 371 | |
| 372 | $allowed = $this->phpbb_download_check_pm_auth($msg_id); |
| 373 | |
| 374 | /** |
| 375 | * Event to modify PM attachments download auth |
| 376 | * |
| 377 | * @event core.modify_pm_attach_download_auth |
| 378 | * @var bool allowed Whether the user is allowed to download from that PM or not |
| 379 | * @var int msg_id The id of the PM to download from |
| 380 | * @var int user_id The user id for auth check |
| 381 | * @since 3.1.11-RC1 |
| 382 | */ |
| 383 | $vars = array('allowed', 'msg_id', 'user_id'); |
| 384 | extract($this->dispatcher->trigger_event('core.modify_pm_attach_download_auth', compact($vars))); |
| 385 | |
| 386 | if (!$allowed) |
| 387 | { |
| 388 | throw new http_exception(403, 'ERROR_NO_ATTACHMENT'); |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | /** |
| 393 | * Checks whether a user can download from a particular PM |
| 394 | * |
| 395 | * @param int $msg_id The id of the PM that we are downloading from |
| 396 | * |
| 397 | * @return bool Whether the user is allowed to download from that PM or not |
| 398 | */ |
| 399 | protected function phpbb_download_check_pm_auth(int $msg_id): bool |
| 400 | { |
| 401 | $user_id = $this->user->data['user_id']; |
| 402 | |
| 403 | // Check if the attachment is within the users scope... |
| 404 | $sql = 'SELECT msg_id |
| 405 | FROM ' . PRIVMSGS_TO_TABLE . ' |
| 406 | WHERE msg_id = ' . (int) $msg_id . ' |
| 407 | AND ( |
| 408 | user_id = ' . (int) $user_id . ' |
| 409 | OR author_id = ' . (int) $user_id . ' |
| 410 | )'; |
| 411 | $result = $this->db->sql_query_limit($sql, 1); |
| 412 | $allowed = (bool) $this->db->sql_fetchfield('msg_id'); |
| 413 | $this->db->sql_freeresult($result); |
| 414 | |
| 415 | return $allowed; |
| 416 | } |
| 417 | |
| 418 | /** |
| 419 | * Increments the download count of all provided attachments |
| 420 | * |
| 421 | * @param int $id The attach_id of the attachment |
| 422 | * |
| 423 | * @return void |
| 424 | */ |
| 425 | protected function phpbb_increment_downloads(int $id): void |
| 426 | { |
| 427 | $sql = 'UPDATE ' . ATTACHMENTS_TABLE . ' |
| 428 | SET download_count = download_count + 1 |
| 429 | WHERE attach_id = ' . $id; |
| 430 | $this->db->sql_query($sql); |
| 431 | } |
| 432 | |
| 433 | /** |
| 434 | * Check if downloading item is allowed |
| 435 | * FIXME (See: https://tracker.phpbb.com/browse/PHPBB3-15264 and http://area51.phpbb.com/phpBB/viewtopic.php?f=81&t=51921) |
| 436 | */ |
| 437 | protected function download_allowed(): bool |
| 438 | { |
| 439 | if (!$this->config['secure_downloads']) |
| 440 | { |
| 441 | return true; |
| 442 | } |
| 443 | |
| 444 | $url = htmlspecialchars_decode($this->request->header('Referer')); |
| 445 | |
| 446 | if (!$url) |
| 447 | { |
| 448 | return ($this->config['secure_allow_empty_referer']) ? true : false; |
| 449 | } |
| 450 | |
| 451 | // Split URL into domain and script part |
| 452 | $url = @parse_url($url); |
| 453 | |
| 454 | if ($url === false) |
| 455 | { |
| 456 | return ($this->config['secure_allow_empty_referer']) ? true : false; |
| 457 | } |
| 458 | |
| 459 | $hostname = $url['host']; |
| 460 | unset($url); |
| 461 | |
| 462 | $allowed = ($this->config['secure_allow_deny']) ? false : true; |
| 463 | $iplist = array(); |
| 464 | |
| 465 | if (($ip_ary = @gethostbynamel($hostname)) !== false) |
| 466 | { |
| 467 | foreach ($ip_ary as $ip) |
| 468 | { |
| 469 | if ($ip) |
| 470 | { |
| 471 | $iplist[] = $ip; |
| 472 | } |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | // Check for own server... |
| 477 | $server_name = $this->user->host; |
| 478 | |
| 479 | // Forcing server vars is the only way to specify/override the protocol |
| 480 | if ($this->config['force_server_vars'] || !$server_name) |
| 481 | { |
| 482 | $server_name = $this->config['server_name']; |
| 483 | } |
| 484 | |
| 485 | if (preg_match('#^.*?' . preg_quote($server_name, '#') . '.*?$#i', $hostname)) |
| 486 | { |
| 487 | $allowed = true; |
| 488 | } |
| 489 | |
| 490 | // Get IP's and Hostnames |
| 491 | if (!$allowed) |
| 492 | { |
| 493 | $sql = 'SELECT site_ip, site_hostname, ip_exclude |
| 494 | FROM ' . SITELIST_TABLE; |
| 495 | $result = $this->db->sql_query($sql); |
| 496 | |
| 497 | while ($row = $this->db->sql_fetchrow($result)) |
| 498 | { |
| 499 | $site_ip = trim($row['site_ip']); |
| 500 | $site_hostname = trim($row['site_hostname']); |
| 501 | |
| 502 | if ($site_ip) |
| 503 | { |
| 504 | foreach ($iplist as $ip) |
| 505 | { |
| 506 | if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_ip, '#')) . '$#i', $ip)) |
| 507 | { |
| 508 | if ($row['ip_exclude']) |
| 509 | { |
| 510 | $allowed = ($this->config['secure_allow_deny']) ? false : true; |
| 511 | break 2; |
| 512 | } |
| 513 | else |
| 514 | { |
| 515 | $allowed = ($this->config['secure_allow_deny']) ? true : false; |
| 516 | } |
| 517 | } |
| 518 | } |
| 519 | } |
| 520 | |
| 521 | if ($site_hostname) |
| 522 | { |
| 523 | if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_hostname, '#')) . '$#i', $hostname)) |
| 524 | { |
| 525 | if ($row['ip_exclude']) |
| 526 | { |
| 527 | $allowed = ($this->config['secure_allow_deny']) ? false : true; |
| 528 | break; |
| 529 | } |
| 530 | else |
| 531 | { |
| 532 | $allowed = ($this->config['secure_allow_deny']) ? true : false; |
| 533 | } |
| 534 | } |
| 535 | } |
| 536 | } |
| 537 | $this->db->sql_freeresult($result); |
| 538 | } |
| 539 | |
| 540 | return $allowed; |
| 541 | } |
| 542 | } |