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| 1 | <?php |
| 2 | /** |
| 3 | * PrivateBin |
| 4 | * |
| 5 | * a zero-knowledge paste bin |
| 6 | * |
| 7 | * @link https://github.com/PrivateBin/PrivateBin |
| 8 | * @copyright 2012 Sébastien SAUVAGE (sebsauvage.net) |
| 9 | * @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License |
| 10 | * @version 1.7.2 |
| 11 | */ |
| 12 | |
| 13 | namespace PrivateBin; |
| 14 | |
| 15 | use Exception; |
| 16 | use PrivateBin\Persistence\ServerSalt; |
| 17 | use PrivateBin\Persistence\TrafficLimiter; |
| 18 | |
| 19 | /** |
| 20 | * Controller |
| 21 | * |
| 22 | * Puts it all together. |
| 23 | */ |
| 24 | class Controller |
| 25 | { |
| 26 | /** |
| 27 | * version |
| 28 | * |
| 29 | * @const string |
| 30 | */ |
| 31 | const VERSION = '1.7.2'; |
| 32 | |
| 33 | /** |
| 34 | * minimal required PHP version |
| 35 | * |
| 36 | * @const string |
| 37 | */ |
| 38 | const MIN_PHP_VERSION = '7.3.0'; |
| 39 | |
| 40 | /** |
| 41 | * show the same error message if the paste expired or does not exist |
| 42 | * |
| 43 | * @const string |
| 44 | */ |
| 45 | const GENERIC_ERROR = 'Paste does not exist, has expired or has been deleted.'; |
| 46 | |
| 47 | /** |
| 48 | * configuration |
| 49 | * |
| 50 | * @access private |
| 51 | * @var Configuration |
| 52 | */ |
| 53 | private $_conf; |
| 54 | |
| 55 | /** |
| 56 | * error message |
| 57 | * |
| 58 | * @access private |
| 59 | * @var string |
| 60 | */ |
| 61 | private $_error = ''; |
| 62 | |
| 63 | /** |
| 64 | * status message |
| 65 | * |
| 66 | * @access private |
| 67 | * @var string |
| 68 | */ |
| 69 | private $_status = ''; |
| 70 | |
| 71 | /** |
| 72 | * JSON message |
| 73 | * |
| 74 | * @access private |
| 75 | * @var string |
| 76 | */ |
| 77 | private $_json = ''; |
| 78 | |
| 79 | /** |
| 80 | * Factory of instance models |
| 81 | * |
| 82 | * @access private |
| 83 | * @var model |
| 84 | */ |
| 85 | private $_model; |
| 86 | |
| 87 | /** |
| 88 | * request |
| 89 | * |
| 90 | * @access private |
| 91 | * @var request |
| 92 | */ |
| 93 | private $_request; |
| 94 | |
| 95 | /** |
| 96 | * URL base |
| 97 | * |
| 98 | * @access private |
| 99 | * @var string |
| 100 | */ |
| 101 | private $_urlBase; |
| 102 | |
| 103 | /** |
| 104 | * constructor |
| 105 | * |
| 106 | * initializes and runs PrivateBin |
| 107 | * |
| 108 | * @access public |
| 109 | * @throws Exception |
| 110 | */ |
| 111 | public function __construct() |
| 112 | { |
| 113 | if (version_compare(PHP_VERSION, self::MIN_PHP_VERSION) < 0) { |
| 114 | error_log(I18n::_('%s requires php %s or above to work. Sorry.', I18n::_('PrivateBin'), self::MIN_PHP_VERSION)); |
| 115 | return; |
| 116 | } |
| 117 | if (strlen(PATH) < 0 && substr(PATH, -1) !== DIRECTORY_SEPARATOR) { |
| 118 | error_log(I18n::_('%s requires the PATH to end in a "%s". Please update the PATH in your index.php.', I18n::_('PrivateBin'), DIRECTORY_SEPARATOR)); |
| 119 | return; |
| 120 | } |
| 121 | |
| 122 | // load config from ini file, initialize required classes |
| 123 | $this->_init(); |
| 124 | |
| 125 | switch ($this->_request->getOperation()) { |
| 126 | case 'create': |
| 127 | $this->_create(); |
| 128 | break; |
| 129 | case 'delete': |
| 130 | $this->_delete( |
| 131 | $this->_request->getParam('pasteid'), |
| 132 | $this->_request->getParam('deletetoken') |
| 133 | ); |
| 134 | break; |
| 135 | case 'read': |
| 136 | $this->_read($this->_request->getParam('pasteid')); |
| 137 | break; |
| 138 | case 'jsonld': |
| 139 | $this->_jsonld($this->_request->getParam('jsonld')); |
| 140 | return; |
| 141 | case 'yourlsproxy': |
| 142 | $this->_yourlsproxy($this->_request->getParam('link')); |
| 143 | break; |
| 144 | } |
| 145 | |
| 146 | $this->_setCacheHeaders(); |
| 147 | |
| 148 | // output JSON or HTML |
| 149 | if ($this->_request->isJsonApiCall()) { |
| 150 | header('Content-type: ' . Request::MIME_JSON); |
| 151 | header('Access-Control-Allow-Origin: *'); |
| 152 | header('Access-Control-Allow-Methods: GET, POST, PUT, DELETE'); |
| 153 | header('Access-Control-Allow-Headers: X-Requested-With, Content-Type'); |
| 154 | header('X-Uncompressed-Content-Length: ' . strlen($this->_json)); |
| 155 | header('Access-Control-Expose-Headers: X-Uncompressed-Content-Length'); |
| 156 | echo $this->_json; |
| 157 | } else { |
| 158 | $this->_view(); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * initialize PrivateBin |
| 164 | * |
| 165 | * @access private |
| 166 | * @throws Exception |
| 167 | */ |
| 168 | private function _init() |
| 169 | { |
| 170 | $this->_conf = new Configuration; |
| 171 | $this->_model = new Model($this->_conf); |
| 172 | $this->_request = new Request; |
| 173 | $this->_urlBase = $this->_request->getRequestUri(); |
| 174 | |
| 175 | // set default language |
| 176 | $lang = $this->_conf->getKey('languagedefault'); |
| 177 | I18n::setLanguageFallback($lang); |
| 178 | // force default language, if language selection is disabled and a default is set |
| 179 | if (!$this->_conf->getKey('languageselection') && strlen($lang) == 2) { |
| 180 | $_COOKIE['lang'] = $lang; |
| 181 | setcookie('lang', $lang, array('SameSite' => 'Lax', 'Secure' => true)); |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * Turn off browser caching |
| 187 | * |
| 188 | * @access private |
| 189 | */ |
| 190 | private function _setCacheHeaders() |
| 191 | { |
| 192 | // set headers to disable caching |
| 193 | $time = gmdate('D, d M Y H:i:s \G\M\T'); |
| 194 | header('Cache-Control: no-store, no-cache, no-transform, must-revalidate'); |
| 195 | header('Pragma: no-cache'); |
| 196 | header('Expires: ' . $time); |
| 197 | header('Last-Modified: ' . $time); |
| 198 | header('Vary: Accept'); |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * Store new paste or comment |
| 203 | * |
| 204 | * POST contains one or both: |
| 205 | * data = json encoded FormatV2 encrypted text (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct) |
| 206 | * attachment = json encoded FormatV2 encrypted text (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct) |
| 207 | * |
| 208 | * All optional data will go to meta information: |
| 209 | * expire (optional) = expiration delay (never,5min,10min,1hour,1day,1week,1month,1year,burn) (default:never) |
| 210 | * formatter (optional) = format to display the paste as (plaintext,syntaxhighlighting,markdown) (default:syntaxhighlighting) |
| 211 | * burnafterreading (optional) = if this paste may only viewed once ? (0/1) (default:0) |
| 212 | * opendiscusssion (optional) = is the discussion allowed on this paste ? (0/1) (default:0) |
| 213 | * attachmentname = json encoded FormatV2 encrypted text (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct) |
| 214 | * nickname (optional) = in discussion, encoded FormatV2 encrypted text nickname of author of comment (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct) |
| 215 | * parentid (optional) = in discussion, which comment this comment replies to. |
| 216 | * pasteid (optional) = in discussion, which paste this comment belongs to. |
| 217 | * |
| 218 | * @access private |
| 219 | * @return string |
| 220 | */ |
| 221 | private function _create() |
| 222 | { |
| 223 | // Ensure last paste from visitors IP address was more than configured amount of seconds ago. |
| 224 | ServerSalt::setStore($this->_model->getStore()); |
| 225 | TrafficLimiter::setConfiguration($this->_conf); |
| 226 | TrafficLimiter::setStore($this->_model->getStore()); |
| 227 | try { |
| 228 | TrafficLimiter::canPass(); |
| 229 | } catch (Exception $e) { |
| 230 | $this->_return_message(1, $e->getMessage()); |
| 231 | return; |
| 232 | } |
| 233 | |
| 234 | $data = $this->_request->getData(); |
| 235 | $isComment = array_key_exists('pasteid', $data) && |
| 236 | !empty($data['pasteid']) && |
| 237 | array_key_exists('parentid', $data) && |
| 238 | !empty($data['parentid']); |
| 239 | if (!FormatV2::isValid($data, $isComment)) { |
| 240 | $this->_return_message(1, I18n::_('Invalid data.')); |
| 241 | return; |
| 242 | } |
| 243 | $sizelimit = $this->_conf->getKey('sizelimit'); |
| 244 | // Ensure content is not too big. |
| 245 | if (strlen($data['ct']) > $sizelimit) { |
| 246 | $this->_return_message( |
| 247 | 1, |
| 248 | I18n::_( |
| 249 | 'Paste is limited to %s of encrypted data.', |
| 250 | Filter::formatHumanReadableSize($sizelimit) |
| 251 | ) |
| 252 | ); |
| 253 | return; |
| 254 | } |
| 255 | |
| 256 | // The user posts a comment. |
| 257 | if ($isComment) { |
| 258 | $paste = $this->_model->getPaste($data['pasteid']); |
| 259 | if ($paste->exists()) { |
| 260 | try { |
| 261 | $comment = $paste->getComment($data['parentid']); |
| 262 | $comment->setData($data); |
| 263 | $comment->store(); |
| 264 | } catch (Exception $e) { |
| 265 | $this->_return_message(1, $e->getMessage()); |
| 266 | return; |
| 267 | } |
| 268 | $this->_return_message(0, $comment->getId()); |
| 269 | } else { |
| 270 | $this->_return_message(1, I18n::_('Invalid data.')); |
| 271 | } |
| 272 | } |
| 273 | // The user posts a standard paste. |
| 274 | else { |
| 275 | try { |
| 276 | $this->_model->purge(); |
| 277 | } catch (Exception $e) { |
| 278 | error_log('Error purging pastes: ' . $e->getMessage() . PHP_EOL . |
| 279 | 'Use the administration scripts statistics to find ' . |
| 280 | 'damaged paste IDs and either delete them or restore them ' . |
| 281 | 'from backup.'); |
| 282 | } |
| 283 | $paste = $this->_model->getPaste(); |
| 284 | try { |
| 285 | $paste->setData($data); |
| 286 | $paste->store(); |
| 287 | } catch (Exception $e) { |
| 288 | return $this->_return_message(1, $e->getMessage()); |
| 289 | } |
| 290 | $this->_return_message(0, $paste->getId(), array('deletetoken' => $paste->getDeleteToken())); |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | /** |
| 295 | * Delete an existing paste |
| 296 | * |
| 297 | * @access private |
| 298 | * @param string $dataid |
| 299 | * @param string $deletetoken |
| 300 | */ |
| 301 | private function _delete($dataid, $deletetoken) |
| 302 | { |
| 303 | try { |
| 304 | $paste = $this->_model->getPaste($dataid); |
| 305 | if ($paste->exists()) { |
| 306 | // accessing this method ensures that the paste would be |
| 307 | // deleted if it has already expired |
| 308 | $paste->get(); |
| 309 | if (hash_equals($paste->getDeleteToken(), $deletetoken)) { |
| 310 | // Paste exists and deletion token is valid: Delete the paste. |
| 311 | $paste->delete(); |
| 312 | $this->_status = 'Paste was properly deleted.'; |
| 313 | } else { |
| 314 | $this->_error = 'Wrong deletion token. Paste was not deleted.'; |
| 315 | } |
| 316 | } else { |
| 317 | $this->_error = self::GENERIC_ERROR; |
| 318 | } |
| 319 | } catch (Exception $e) { |
| 320 | $this->_error = $e->getMessage(); |
| 321 | } |
| 322 | if ($this->_request->isJsonApiCall()) { |
| 323 | if (empty($this->_error)) { |
| 324 | $this->_return_message(0, $dataid); |
| 325 | } else { |
| 326 | $this->_return_message(1, $this->_error); |
| 327 | } |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | /** |
| 332 | * Read an existing paste or comment, only allowed via a JSON API call |
| 333 | * |
| 334 | * @access private |
| 335 | * @param string $dataid |
| 336 | */ |
| 337 | private function _read($dataid) |
| 338 | { |
| 339 | if (!$this->_request->isJsonApiCall()) { |
| 340 | return; |
| 341 | } |
| 342 | |
| 343 | try { |
| 344 | $paste = $this->_model->getPaste($dataid); |
| 345 | if ($paste->exists()) { |
| 346 | $data = $paste->get(); |
| 347 | if (array_key_exists('salt', $data['meta'])) { |
| 348 | unset($data['meta']['salt']); |
| 349 | } |
| 350 | $this->_return_message(0, $dataid, (array) $data); |
| 351 | } else { |
| 352 | $this->_return_message(1, self::GENERIC_ERROR); |
| 353 | } |
| 354 | } catch (Exception $e) { |
| 355 | $this->_return_message(1, $e->getMessage()); |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | /** |
| 360 | * Display frontend. |
| 361 | * |
| 362 | * @access private |
| 363 | */ |
| 364 | private function _view() |
| 365 | { |
| 366 | header('Content-Security-Policy: ' . $this->_conf->getKey('cspheader')); |
| 367 | header('Cross-Origin-Resource-Policy: same-origin'); |
| 368 | header('Cross-Origin-Embedder-Policy: require-corp'); |
| 369 | // disabled, because it prevents links from a paste to the same site to |
| 370 | // be opened. Didn't work with `same-origin-allow-popups` either. |
| 371 | // See issue https://github.com/PrivateBin/PrivateBin/issues/970 for details. |
| 372 | // header('Cross-Origin-Opener-Policy: same-origin'); |
| 373 | header('Permissions-Policy: browsing-topics=()'); |
| 374 | header('Referrer-Policy: no-referrer'); |
| 375 | header('X-Content-Type-Options: nosniff'); |
| 376 | header('X-Frame-Options: deny'); |
| 377 | header('X-XSS-Protection: 1; mode=block'); |
| 378 | |
| 379 | // label all the expiration options |
| 380 | $expire = array(); |
| 381 | foreach ($this->_conf->getSection('expire_options') as $time => $seconds) { |
| 382 | $expire[$time] = ($seconds == 0) ? I18n::_(ucfirst($time)) : Filter::formatHumanReadableTime($time); |
| 383 | } |
| 384 | |
| 385 | // translate all the formatter options |
| 386 | $formatters = array_map('PrivateBin\\I18n::_', $this->_conf->getSection('formatter_options')); |
| 387 | |
| 388 | // set language cookie if that functionality was enabled |
| 389 | $languageselection = ''; |
| 390 | if ($this->_conf->getKey('languageselection')) { |
| 391 | $languageselection = I18n::getLanguage(); |
| 392 | setcookie('lang', $languageselection, array('SameSite' => 'Lax', 'Secure' => true)); |
| 393 | } |
| 394 | |
| 395 | // strip policies that are unsupported in meta tag |
| 396 | $metacspheader = str_replace( |
| 397 | array( |
| 398 | 'frame-ancestors \'none\'; ', |
| 399 | '; sandbox allow-same-origin allow-scripts allow-forms allow-popups allow-modals allow-downloads', |
| 400 | ), |
| 401 | '', |
| 402 | $this->_conf->getKey('cspheader') |
| 403 | ); |
| 404 | |
| 405 | $page = new View; |
| 406 | $page->assign('CSPHEADER', $metacspheader); |
| 407 | $page->assign('ERROR', I18n::_($this->_error)); |
| 408 | $page->assign('NAME', $this->_conf->getKey('name')); |
| 409 | if ($this->_request->getOperation() === 'yourlsproxy') { |
| 410 | $page->assign('SHORTURL', $this->_status); |
| 411 | $page->draw('yourlsproxy'); |
| 412 | return; |
| 413 | } |
| 414 | $page->assign('BASEPATH', I18n::_($this->_conf->getKey('basepath'))); |
| 415 | $page->assign('STATUS', I18n::_($this->_status)); |
| 416 | $page->assign('VERSION', self::VERSION); |
| 417 | $page->assign('DISCUSSION', $this->_conf->getKey('discussion')); |
| 418 | $page->assign('OPENDISCUSSION', $this->_conf->getKey('opendiscussion')); |
| 419 | $page->assign('MARKDOWN', array_key_exists('markdown', $formatters)); |
| 420 | $page->assign('SYNTAXHIGHLIGHTING', array_key_exists('syntaxhighlighting', $formatters)); |
| 421 | $page->assign('SYNTAXHIGHLIGHTINGTHEME', $this->_conf->getKey('syntaxhighlightingtheme')); |
| 422 | $page->assign('FORMATTER', $formatters); |
| 423 | $page->assign('FORMATTERDEFAULT', $this->_conf->getKey('defaultformatter')); |
| 424 | $page->assign('INFO', I18n::_(str_replace("'", '"', $this->_conf->getKey('info')))); |
| 425 | $page->assign('NOTICE', I18n::_($this->_conf->getKey('notice'))); |
| 426 | $page->assign('BURNAFTERREADINGSELECTED', $this->_conf->getKey('burnafterreadingselected')); |
| 427 | $page->assign('PASSWORD', $this->_conf->getKey('password')); |
| 428 | $page->assign('FILEUPLOAD', $this->_conf->getKey('fileupload')); |
| 429 | $page->assign('ZEROBINCOMPATIBILITY', $this->_conf->getKey('zerobincompatibility')); |
| 430 | $page->assign('LANGUAGESELECTION', $languageselection); |
| 431 | $page->assign('LANGUAGES', I18n::getLanguageLabels(I18n::getAvailableLanguages())); |
| 432 | $page->assign('EXPIRE', $expire); |
| 433 | $page->assign('EXPIREDEFAULT', $this->_conf->getKey('default', 'expire')); |
| 434 | $page->assign('URLSHORTENER', $this->_conf->getKey('urlshortener')); |
| 435 | $page->assign('QRCODE', $this->_conf->getKey('qrcode')); |
| 436 | $page->assign('EMAIL', $this->_conf->getKey('email')); |
| 437 | $page->assign('HTTPWARNING', $this->_conf->getKey('httpwarning')); |
| 438 | $page->assign('HTTPSLINK', 'https://' . $this->_request->getHost() . $this->_request->getRequestUri()); |
| 439 | $page->assign('COMPRESSION', $this->_conf->getKey('compression')); |
| 440 | $page->draw($this->_conf->getKey('template')); |
| 441 | } |
| 442 | |
| 443 | /** |
| 444 | * outputs requested JSON-LD context |
| 445 | * |
| 446 | * @access private |
| 447 | * @param string $type |
| 448 | */ |
| 449 | private function _jsonld($type) |
| 450 | { |
| 451 | if (!in_array($type, array( |
| 452 | 'comment', |
| 453 | 'commentmeta', |
| 454 | 'paste', |
| 455 | 'pastemeta', |
| 456 | 'types', |
| 457 | ))) { |
| 458 | $type = ''; |
| 459 | } |
| 460 | $content = '{}'; |
| 461 | $file = PUBLIC_PATH . DIRECTORY_SEPARATOR . 'js' . DIRECTORY_SEPARATOR . $type . '.jsonld'; |
| 462 | if (is_readable($file)) { |
| 463 | $content = str_replace( |
| 464 | '?jsonld=', |
| 465 | $this->_urlBase . '?jsonld=', |
| 466 | file_get_contents($file) |
| 467 | ); |
| 468 | } |
| 469 | if ($type === 'types') { |
| 470 | $content = str_replace( |
| 471 | implode('", "', array_keys($this->_conf->getDefaults()['expire_options'])), |
| 472 | implode('", "', array_keys($this->_conf->getSection('expire_options'))), |
| 473 | $content |
| 474 | ); |
| 475 | } |
| 476 | |
| 477 | header('Content-type: application/ld+json'); |
| 478 | header('Access-Control-Allow-Origin: *'); |
| 479 | header('Access-Control-Allow-Methods: GET'); |
| 480 | echo $content; |
| 481 | } |
| 482 | |
| 483 | /** |
| 484 | * proxies link to YOURLS, updates status or error with response |
| 485 | * |
| 486 | * @access private |
| 487 | * @param string $link |
| 488 | */ |
| 489 | private function _yourlsproxy($link) |
| 490 | { |
| 491 | $yourls = new YourlsProxy($this->_conf, $link); |
| 492 | if ($yourls->isError()) { |
| 493 | $this->_error = $yourls->getError(); |
| 494 | } else { |
| 495 | $this->_status = $yourls->getUrl(); |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | /** |
| 500 | * prepares JSON encoded status message |
| 501 | * |
| 502 | * @access private |
| 503 | * @param int $status |
| 504 | * @param string $message |
| 505 | * @param array $other |
| 506 | */ |
| 507 | private function _return_message($status, $message, $other = array()) |
| 508 | { |
| 509 | $result = array('status' => $status); |
| 510 | if ($status) { |
| 511 | $result['message'] = I18n::_($message); |
| 512 | } else { |
| 513 | $result['id'] = $message; |
| 514 | $result['url'] = $this->_urlBase . '?' . $message; |
| 515 | } |
| 516 | $result += $other; |
| 517 | $this->_json = Json::encode($result); |
| 518 | } |
| 519 | } |