lib/functions.php

   1 <?php
   2 /*
   3  *  Jirafeau, your web file repository
   4  *  Copyright (C) 2008  Julien "axolotl" BERNARD <axolotl@magieeternelle.org>
   5  *  Copyright (C) 2015  Jerome Jutteau <jerome@jutteau.fr>
   6  *  Copyright (C) 2015  Nicola Spanti (RyDroid) <dev@nicola-spanti.info>
   7  *
   8  *  This program is free software: you can redistribute it and/or modify
   9  *  it under the terms of the GNU Affero General Public License as
  10  *  published by the Free Software Foundation, either version 3 of the
  11  *  License, or (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU Affero General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU Affero General Public License
  19  *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
  20  */
  21
  22 /**
  23  * Transform a string in a path by separating each letters by a '/'.
  24  * @return path finishing with a '/'
  25  */
  26 function s2p($s)
  27 {
  28     $block_size = 8;
  29     $p = '';
  30     for ($i = 0; $i < strlen($s); $i++) {
  31         $p .= $s[$i];
  32         if (($i + 1) % $block_size == 0) {
  33             $p .= '/';
  34         }
  35     }
  36     if (strlen($s) % $block_size != 0) {
  37         $p .= '/';
  38     }
  39     return $p;
  40 }
  41
  42 /**
  43  * Convert base 16 to base 64
  44  * @returns A string based on 64 characters (0-9, a-z, A-Z, "-" and "_")
  45  */
  46 function base_16_to_64($num)
  47 {
  48     $m = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_';
  49     $hex2bin = array('0000',  # 0
  50                       '0001',  # 1
  51                       '0010',  # 2
  52                       '0011',  # 3
  53                       '0100',  # 4
  54                       '0101',  # 5
  55                       '0110',  # 6
  56                       '0111',  # 7
  57                       '1000',  # 8
  58                       '1001',  # 9
  59                       '1010',  # a
  60                       '1011',  # b
  61                       '1100',  # c
  62                       '1101',  # d
  63                       '1110',  # e
  64                       '1111'); # f
  65     $o = '';
  66     $b = '';
  67     $i = 0;
  68     # Convert long hex string to bin.
  69     $size = strlen($num);
  70     for ($i = 0; $i < $size; $i++) {
  71         $b .= $hex2bin[hexdec($num[$i])];
  72     }
  73     # Convert long bin to base 64.
  74     $size *= 4;
  75     for ($i = $size - 6; $i >= 0; $i -= 6) {
  76         $o = $m[bindec(substr($b, $i, 6))] . $o;
  77     }
  78     # Some few bits remaining ?
  79     if ($i < 0 && $i > -6) {
  80         $o = $m[bindec(substr($b, 0, $i + 6))] . $o;
  81     }
  82     return $o;
  83 }
  84
  85 /**
  86   * Generate a random code.
  87   * @param $l code length
  88   * @return  random code.
  89   */
  90 function jirafeau_gen_random($l)
  91 {
  92     if ($l <= 0) {
  93         return 42;
  94     }
  95
  96     $code="";
  97     for ($i = 0; $i < $l; $i++) {
  98         $code .= dechex(rand(0, 15));
  99     }
 100
 101     return $code;
 102 }
 103
 104 function jirafeau_gen_download_pass($length, $allowed_chars)
 105 {
 106     if ($length <= 0) {
 107         return false;
 108     }
 109     $pass="";
 110     for ($i = 0; $i < $length; $i++) {
 111         $pass .= $allowed_chars[rand(0, strlen($allowed_chars) - 1)];
 112     }
 113
 114     return $pass;
 115 }
 116
 117 function is_ssl()
 118 {
 119     if (isset($_SERVER['HTTPS'])) {
 120         if ('on' == strtolower($_SERVER['HTTPS']) ||
 121              '1' == $_SERVER['HTTPS']) {
 122             return true;
 123         }
 124     } elseif (isset($_SERVER['SERVER_PORT']) && ('443' == $_SERVER['SERVER_PORT'])) {
 125         return true;
 126     } elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
 127         if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
 128             return true;
 129         }
 130     }
 131     return false;
 132 }
 133
 134 function jirafeau_human_size($octets)
 135 {
 136     $u = array('B', 'KB', 'MB', 'GB', 'TB');
 137     $o = max($octets, 0);
 138     $p = min(floor(($o ? log($o) : 0) / log(1024)), count($u) - 1);
 139     $o /= pow(1024, $p);
 140     return round($o, 1) . $u[$p];
 141 }
 142
 143 // Convert UTC timestamp to a datetime field
 144 function jirafeau_get_datetimefield($timestamp)
 145 {
 146
 147     $ts = date_create("@" . $timestamp);
 148     $content = '<span class="datetime" data-datetime="' . date_format($ts, 'Y-m-d H:i') . '">'
 149         . date_format($ts, 'Y-m-d H:i') . ' (GMT)</span>';
 150
 151     return $content;
 152 }
 153
 154 function jirafeau_fatal_error($errorText, $cfg = array())
 155 {
 156     echo '<div class="error"><h2>Error</h2><p>' . $errorText . '</p></div>';
 157     require(JIRAFEAU_ROOT . 'lib/template/footer.php');
 158     exit;
 159 }
 160
 161 function jirafeau_clean_rm_link($link)
 162 {
 163     $p = s2p("$link");
 164     if (file_exists(VAR_LINKS . $p . $link)) {
 165         unlink(VAR_LINKS . $p . $link);
 166     }
 167     if (file_exists(VAR_LINKS . $p . $link . '_download')) {
 168         unlink(VAR_LINKS . $p . $link . '_download');
 169     }
 170     $parse = VAR_LINKS . $p;
 171     $scan = array();
 172     while (file_exists($parse)
 173            && ($scan = scandir($parse))
 174            && count($scan) == 2 // '.' and '..' folders => empty.
 175            && basename($parse) != basename(VAR_LINKS)) {
 176         rmdir($parse);
 177         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 178     }
 179 }
 180
 181 function jirafeau_clean_rm_file($hash)
 182 {
 183     $p = s2p("$hash");
 184     $f = VAR_FILES . $p . $hash;
 185     if (file_exists($f) && is_file($f)) {
 186         unlink($f);
 187     }
 188     if (file_exists($f . '_count') && is_file($f . '_count')) {
 189         unlink($f . '_count');
 190     }
 191     $parse = VAR_FILES . $p;
 192     $scan = array();
 193     while (file_exists($parse)
 194            && ($scan = scandir($parse))
 195            && count($scan) == 2 // '.' and '..' folders => empty.
 196            && basename($parse) != basename(VAR_FILES)) {
 197         rmdir($parse);
 198         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 199     }
 200 }
 201
 202 /**
 203  * transforms a php.ini string representing a value in an integer
 204  * @param $value the value from php.ini
 205  * @returns an integer for this value
 206  */
 207 function jirafeau_ini_to_bytes($value)
 208 {
 209     $modifier = substr($value, -1);
 210     $bytes = substr($value, 0, -1);
 211     switch (strtoupper($modifier)) {
 212         default:
 213             return intval($value);
 214             break;
 215         case 'P':
 216             $bytes *= 1024;
 217             // no break
 218         case 'T':
 219             $bytes *= 1024;
 220             // no break
 221         case 'G':
 222             $bytes *= 1024;
 223             // no break
 224         case 'M':
 225             $bytes *= 1024;
 226             // no break
 227         case 'K':
 228             $bytes *= 1024;
 229     }
 230     return $bytes;
 231 }
 232
 233 /**
 234  * gets the maximum upload size according to php.ini
 235  * @returns the maximum upload size in bytes
 236  */
 237 function jirafeau_get_max_upload_size_bytes()
 238 {
 239     return min(
 240         jirafeau_ini_to_bytes(ini_get('post_max_size')),
 241         jirafeau_ini_to_bytes(ini_get('upload_max_filesize'))
 242     );
 243 }
 244
 245 /**
 246  * gets the maximum upload size according to php.ini
 247  * @returns the maximum upload size string
 248  */
 249 function jirafeau_get_max_upload_size()
 250 {
 251     return jirafeau_human_size(jirafeau_get_max_upload_size_bytes());
 252 }
 253
 254 /**
 255  * get the maximal upload size for a data chunk in async uploads
 256  * @param max_upload_chunk_size_bytes
 257  */
 258 function jirafeau_get_max_upload_chunk_size_bytes($max_upload_chunk_size_bytes = 0)
 259 {
 260     if ($max_upload_chunk_size_bytes == 0) {
 261         $size = jirafeau_get_max_upload_size_bytes();
 262         // Jirafeau must choose an arbitrary number as PHP config does not give any limit nor $max_upload_chunk_size_bytes
 263         if ($size == 0) {
 264             return 10000000; // 10MB
 265         }
 266         return $size;
 267     }
 268     $size = min(
 269         jirafeau_get_max_upload_size_bytes(),
 270         $max_upload_chunk_size_bytes
 271     );
 272     if ($size == 0) {
 273         return $max_upload_chunk_size_bytes;
 274     }
 275     return $size;
 276 }
 277
 278 /**
 279  * gets a string explaining the error
 280  * @param $code the error code
 281  * @returns a string explaining the error
 282  */
 283 function jirafeau_upload_errstr($code)
 284 {
 285     switch ($code) {
 286         case UPLOAD_ERR_INI_SIZE:
 287         case UPLOAD_ERR_FORM_SIZE:
 288             return t('Your file exceeds the maximum authorized file size. ');
 289
 290         case UPLOAD_ERR_PARTIAL:
 291         case UPLOAD_ERR_NO_FILE:
 292             return
 293                 t('Your file was not uploaded correctly. You may succeed in retrying. ');
 294
 295         case UPLOAD_ERR_NO_TMP_DIR:
 296         case UPLOAD_ERR_CANT_WRITE:
 297         case UPLOAD_ERR_EXTENSION:
 298             return t('Internal error. You may not succeed in retrying. ');
 299     }
 300     return t('Unknown error. ');
 301 }
 302
 303 /** Remove link and it's file
 304  * @param $link the link's name (hash)
 305  */
 306
 307 function jirafeau_delete_link($link)
 308 {
 309     $l = jirafeau_get_link($link);
 310     if (!count($l)) {
 311         return;
 312     }
 313
 314     jirafeau_clean_rm_link($link);
 315
 316     $hash = $l['hash'];
 317     $p = s2p("$hash");
 318
 319     $counter = 1;
 320     if (file_exists(VAR_FILES . $p . $hash. '_count')) {
 321         $content = file(VAR_FILES . $p . $hash. '_count');
 322         $counter = trim($content[0]);
 323     }
 324     $counter--;
 325
 326     if ($counter >= 1) {
 327         $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 328         fwrite($handle, $counter);
 329         fclose($handle);
 330     }
 331
 332     if ($counter == 0) {
 333         jirafeau_clean_rm_file($hash);
 334     }
 335 }
 336
 337 /**
 338  * Delete a file and it's links.
 339  */
 340 function jirafeau_delete_file($hash)
 341 {
 342     $count = 0;
 343     /* Get all links files. */
 344     $stack = array(VAR_LINKS);
 345     while (($d = array_shift($stack)) && $d != null) {
 346         $dir = scandir($d);
 347
 348         foreach ($dir as $node) {
 349             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 350                 preg_match('/\.tmp/i', "$node")) {
 351                 continue;
 352             }
 353
 354             if (is_dir($d . $node)) {
 355                 /* Push new found directory. */
 356                 $stack[] = $d . $node . '/';
 357             } elseif (is_file($d . $node)) {
 358                 /* Read link informations. */
 359                 $l = jirafeau_get_link(basename($node));
 360                 if (!count($l)) {
 361                     continue;
 362                 }
 363                 if ($l['hash'] == $hash) {
 364                     $count++;
 365                     jirafeau_delete_link($node);
 366                 }
 367             }
 368         }
 369     }
 370     jirafeau_clean_rm_file($hash);
 371     return $count;
 372 }
 373
 374
 375 /** hash file's content
 376  * @param $method hash method, see 'file_hash' option. Valid methods are 'md5', 'md5_outside' or 'random'
 377  * @param $file_path file to hash
 378  * @returns hash string
 379  */
 380 function jirafeau_hash_file($method, $file_path)
 381 {
 382     switch ($method) {
 383         case 'md5_outside':
 384             return jirafeau_md5_outside($file_path);
 385         case 'md5':
 386             return md5_file($file_path);
 387         case 'random':
 388             return jirafeau_gen_random(32);
 389     }
 390     return md5_file($file_path);
 391 }
 392
 393 /** hash part of file: start, end and size.
 394  * This is a partial file hash, faster but weaker.
 395  * @param $file_path file to hash
 396  * @returns hash string
 397  */
 398 function jirafeau_md5_outside($file_path)
 399 {
 400     $out = false;
 401     $handle = fopen($file_path, "r");
 402     if ($handle === false) {
 403         return false;
 404     }
 405     $size = filesize($file_path);
 406     if ($size === false) {
 407         goto err;
 408     }
 409     $first = fread($handle, 64);
 410     if ($first === false) {
 411         goto err;
 412     }
 413     if (fseek($handle, $size < 64 ? 0 : $size - 64) == -1) {
 414         goto err;
 415     }
 416     $last = fread($handle, 64);
 417     if ($last === false) {
 418         goto err;
 419     }
 420     $out = md5($first . $last . $size);
 421     err:
 422     fclose($handle);
 423     return $out;
 424 }
 425
 426 /**
 427  * handles an uploaded file
 428  * @param $file the file struct given by $_FILE[]
 429  * @param $one_time_download is the file a one time download ?
 430  * @param $key if not empty, protect the file with this key
 431  * @param $time the time of validity of the file
 432  * @param $ip uploader's ip
 433  * @param $crypt boolean asking to crypt or not
 434  * @param $link_name_length size of the link name
 435  * @returns an array containing some information
 436  *   'error' => information on possible errors
 437  *   'link' => the link name of the uploaded file
 438  *   'delete_link' => the link code to delete file
 439  */
 440 function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $link_name_length, $file_hash_method)
 441 {
 442     if (empty($file['tmp_name']) || !is_uploaded_file($file['tmp_name'])) {
 443         return (array(
 444                  'error' =>
 445                    array('has_error' => true,
 446                           'why' => jirafeau_upload_errstr($file['error'])),
 447                  'link' => '',
 448                  'delete_link' => ''));
 449     }
 450
 451     /* array representing no error */
 452     $noerr = array('has_error' => false, 'why' => '');
 453
 454     /* Crypt file if option is enabled. */
 455     $crypted = false;
 456     $crypt_key = '';
 457     if ($crypt == true && !(extension_loaded('sodium') == true)) {
 458         error_log("PHP extension sodium not loaded, won't encrypt in Jirafeau");
 459     }
 460     if ($crypt == true && extension_loaded('sodium') == true) {
 461         $crypt_key = jirafeau_encrypt_file($file['tmp_name'], $file['tmp_name'].'crypt');
 462         if (strlen($crypt_key) > 0) {
 463             if (rename($file['tmp_name'].'crypt', $file['tmp_name']) === true) {
 464                 $crypted = true;
 465             }
 466         }
 467     }
 468
 469     /* file information */
 470     $hash = jirafeau_hash_file($file_hash_method, $file['tmp_name']);
 471     $name = str_replace(NL, '', trim($file['name']));
 472     $mime_type = $file['type'];
 473     $size = $file['size'];
 474
 475     /* does file already exist ? */
 476     $rc = false;
 477     $p = s2p("$hash");
 478     if (file_exists(VAR_FILES . $p .  $hash)) {
 479         $rc = unlink($file['tmp_name']);
 480     } elseif ((file_exists(VAR_FILES . $p) || @mkdir(VAR_FILES . $p, 0755, true))
 481             && move_uploaded_file($file['tmp_name'], VAR_FILES . $p . $hash)) {
 482         $rc = true;
 483     }
 484     if (!$rc) {
 485         return (array(
 486                  'error' =>
 487                    array('has_error' => true,
 488                           'why' => t('INTERNAL_ERROR_DEL')),
 489                  'link' =>'',
 490                  'delete_link' => ''));
 491     }
 492
 493     /* Increment or create count file. */
 494     $counter = 0;
 495     if (file_exists(VAR_FILES . $p . $hash . '_count')) {
 496         $content = file(VAR_FILES . $p . $hash. '_count');
 497         $counter = trim($content[0]);
 498     }
 499     $counter++;
 500     $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 501     fwrite($handle, $counter);
 502     fclose($handle);
 503
 504     /* Create delete code. */
 505     $delete_link_code = jirafeau_gen_random(5);
 506
 507     /* hash password or empty. */
 508     $password = '';
 509     if (!empty($key)) {
 510         $password = md5($key);
 511     }
 512
 513     /* create link file */
 514     $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
 515     $handle = fopen($link_tmp_name, 'w');
 516     fwrite(
 517         $handle,
 518         $name . NL. $mime_type . NL. $size . NL. $password . NL. $time .
 519             NL . $hash. NL . ($one_time_download ? 'O' : 'R') . NL . time() .
 520             NL . $ip . NL. $delete_link_code . NL . ($crypted ? 'C2' : 'O')
 521     );
 522     fclose($handle);
 523     $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 524     $l = s2p("$hash_link");
 525     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 526         !rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
 527         if (file_exists($link_tmp_name)) {
 528             unlink($link_tmp_name);
 529         }
 530
 531         $counter--;
 532         if ($counter >= 1) {
 533             $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 534             fwrite($handle, $counter);
 535             fclose($handle);
 536         } else {
 537             jirafeau_clean_rm_file($hash_link);
 538         }
 539         return array(
 540                  'error' =>
 541                    array('has_error' => true,
 542                           'why' => t('Internal error during file creation. ')),
 543                  'link' =>'',
 544                  'delete_link' => '');
 545     }
 546     return array( 'error' => $noerr,
 547                   'link' => $hash_link,
 548                   'delete_link' => $delete_link_code,
 549                   'crypt_key' => $crypt_key);
 550 }
 551
 552 /**
 553  * Tells if a mime-type is viewable in a browser
 554  * @param $mime the mime type
 555  * @returns a boolean telling if a mime type is viewable
 556  */
 557 function jirafeau_is_viewable($mime)
 558 {
 559     if (!empty($mime)) {
 560         $viewable = array('image', 'video', 'audio');
 561         $decomposed = explode('/', $mime);
 562         if (in_array($decomposed[0], $viewable) && strpos($mime, 'image/svg+xml') === false) {
 563             return true;
 564         }
 565         $viewable = array('text/plain');
 566         if (in_array($mime, $viewable)) {
 567             return true;
 568         }
 569     }
 570     return false;
 571 }
 572
 573 // Error handling functions.
 574 //! Global array that contains all registered errors.
 575 $error_list = array();
 576
 577 /**
 578  * Adds an error to the list of errors.
 579  * @param $title the error's title
 580  * @param $description is a human-friendly description of the problem.
 581  */
 582 function add_error($title, $description)
 583 {
 584     global $error_list;
 585     $error_list[] = '<p>' . $title. '<br />' . $description. '</p>';
 586 }
 587
 588 /**
 589  * Informs whether any error has been registered yet.
 590  * @return true if there are errors.
 591  */
 592 function has_error()
 593 {
 594     global $error_list;
 595     return !empty($error_list);
 596 }
 597
 598 /**
 599  * Displays all the errors.
 600  */
 601 function show_errors()
 602 {
 603     if (has_error()) {
 604         global $error_list;
 605         echo '<div class="error">';
 606         foreach ($error_list as $error) {
 607             echo $error;
 608         }
 609         echo '</div>';
 610     }
 611 }
 612
 613 function check_errors($cfg)
 614 {
 615     if (!($cfg['installation_done'] === true)) {
 616         if (file_exists(JIRAFEAU_ROOT . 'install.php')) {
 617             header('Location: install.php');
 618             exit;
 619         } else {
 620             add_error(t('INSTALL_FILE_NOT_FOUND_TITLE'), t('INSTALL_FILE_NOT_FOUND_DESC'));
 621         }
 622     }
 623
 624     if (!is_writable(VAR_FILES)) {
 625         add_error(t('FILE_DIR_W'), VAR_FILES);
 626     }
 627
 628     if (!is_writable(VAR_LINKS)) {
 629         add_error(t('LINK_DIR_W'), VAR_LINKS);
 630     }
 631
 632     if (!is_writable(VAR_ASYNC)) {
 633         add_error(t('ASYNC_DIR_W'), VAR_ASYNC);
 634     }
 635
 636     if ($cfg['enable_crypt'] && $cfg['litespeed_workaround']) {
 637         add_error(t('INCOMPATIBLE_OPTIONS_W'), 'enable_crypt=true<br>litespeed_workaround=true');
 638     }
 639
 640     if ($cfg['one_time_download'] && $cfg['litespeed_workaround']) {
 641         add_error(t('INCOMPATIBLE_OPTIONS_W'), 'one_time_download=true<br>litespeed_workaround=true');
 642     }
 643 }
 644
 645 /**
 646  * Read link information
 647  * @return array containing information.
 648  */
 649 function jirafeau_get_link($hash)
 650 {
 651     $out = array();
 652     $link = VAR_LINKS . s2p("$hash") . $hash;
 653
 654     if (!file_exists($link)) {
 655         return $out;
 656     }
 657
 658     $c = file($link);
 659     $out['file_name'] = trim($c[0]);
 660     $out['mime_type'] = trim($c[1]);
 661     $out['file_size'] = trim($c[2]);
 662     $out['key'] = trim($c[3], NL);
 663     $out['time'] = trim($c[4]);
 664     $out['hash'] = trim($c[5]);
 665     $out['onetime'] = trim($c[6]);
 666     $out['upload_date'] = trim($c[7]);
 667     $out['ip'] = trim($c[8]);
 668     $out['link_code'] = trim($c[9]);
 669     $out['crypted'] = trim($c[10]) == 'C2';
 670     $out['crypted_legacy'] = trim($c[10]) == 'C';
 671
 672     return $out;
 673 }
 674
 675 /**
 676  * List files in admin interface.
 677  */
 678 function jirafeau_admin_list($name, $file_hash, $link_hash)
 679 {
 680     echo '<fieldset><legend>';
 681     if (!empty($name)) {
 682         echo t('FILENAME') . ": " . jirafeau_escape($name);
 683     }
 684     if (!empty($file_hash)) {
 685         echo t('FILE') . ": " . jirafeau_escape($file_hash);
 686     }
 687     if (!empty($link_hash)) {
 688         echo t('LINK') . ": " . jirafeau_escape($link_hash);
 689     }
 690     if (empty($name) && empty($file_hash) && empty($link_hash)) {
 691         echo t('LS_FILES');
 692     }
 693     echo '</legend>';
 694     echo '<table>';
 695     echo '<tr>';
 696     echo '<th></th>';
 697     echo '<th>' . t('ACTION') . '</th>';
 698     echo '</tr>';
 699
 700     /* Get all links files. */
 701     $stack = array(VAR_LINKS);
 702     while (($d = array_shift($stack)) && $d != null) {
 703         $dir = scandir($d);
 704         foreach ($dir as $node) {
 705             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 706                 preg_match('/\.tmp/i', "$node")) {
 707                 continue;
 708             }
 709             if (is_dir($d . $node)) {
 710                 /* Push new found directory. */
 711                 $stack[] = $d . $node . '/';
 712             } elseif (is_file($d . $node)) {
 713                 /* Read link information. */
 714                 $l = jirafeau_get_link($node);
 715                 if (!count($l)) {
 716                     continue;
 717                 }
 718                 $ld = jirafeau_get_download_stats($node);
 719
 720                 /* Filter. */
 721                 if (!empty($name) && !@preg_match("/$name/i", jirafeau_escape($l['file_name']))) {
 722                     continue;
 723                 }
 724                 if (!empty($file_hash) && $file_hash != $l['hash']) {
 725                     continue;
 726                 }
 727                 if (!empty($link_hash) && $link_hash != $node) {
 728                     continue;
 729                 }
 730                 /* Print link information. */
 731                 echo '<tr>';
 732                 echo '<td>' .
 733                 '<strong><a id="upload_link" href="f.php?h='. jirafeau_escape($node) .'" title="' .
 734                     t('DL_PAGE') . '">' . jirafeau_escape($l['file_name']) . '</a></strong><br/>';
 735                 echo t('TYPE') . ': ' . jirafeau_escape($l['mime_type']) . '<br/>';
 736                 echo t('SIZE') . ': ' . jirafeau_human_size($l['file_size']) . '<br>';
 737                 echo t('EXPIRE') . ': ' . ($l['time'] == -1 ? '∞' : jirafeau_get_datetimefield($l['time'])) . '<br/>';
 738                 echo t('ONETIME') . ': ' . ($l['onetime'] == 'O' ? 'Yes' : 'No') . '<br/>';
 739                 echo t('UPLOAD_DATE') . ': ' . jirafeau_get_datetimefield($l['upload_date']) . '<br/>';
 740                 if (strlen($l['ip']) > 0) {
 741                     echo t('ORIGIN') . ': ' . $l['ip'] . '<br/>';
 742                 }
 743                 echo t('DOWNLOAD_COUNT') . ': ' . $ld['count'] . '<br/>';
 744                 if ($ld['count'] > 0) {
 745                     echo t('DOWNLOAD_DATE') . ': ' . jirafeau_get_datetimefield($ld['date']) . '<br/>';
 746                     echo t('DOWNLOAD_IP') . ': ' . $ld['ip'] . '<br/>';
 747                 }
 748                 echo '</td><td>';
 749                 echo '<form method="post">' .
 750                 '<input type = "hidden" name = "action" value = "download"/>' .
 751                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 752                 jirafeau_admin_csrf_field() .
 753                 '<input type = "submit" value = "' . t('DL') . '" />' .
 754                 '</form>' .
 755                 '<form method="post">' .
 756                 '<input type = "hidden" name = "action" value = "delete_link"/>' .
 757                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 758                 jirafeau_admin_csrf_field() .
 759                 '<input type = "submit" value = "' . t('DEL_LINK') . '" />' .
 760                 '</form>' .
 761                 '<form method="post">' .
 762                 '<input type = "hidden" name = "action" value = "delete_file"/>' .
 763                 '<input type = "hidden" name = "hash" value = "' . $l['hash'] . '"/>' .
 764                 jirafeau_admin_csrf_field() .
 765                 '<input type = "submit" value = "' . t('DEL_FILE_LINKS') . '" />' .
 766                 '</form>' .
 767                 '</td>';
 768                 echo '</tr>';
 769             }
 770         }
 771     }
 772     echo '</table></fieldset>';
 773 }
 774
 775 /**
 776  * Clean expired files.
 777  * @return number of cleaned files.
 778  */
 779 function jirafeau_admin_clean()
 780 {
 781     $count = 0;
 782     /* Get all links files. */
 783     $stack = array(VAR_LINKS);
 784     while (($d = array_shift($stack)) && $d != null) {
 785         $dir = scandir($d);
 786
 787         foreach ($dir as $node) {
 788             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 789                 preg_match('/\.tmp/i', "$node")) {
 790                 continue;
 791             }
 792
 793             if (is_dir($d . $node)) {
 794                 /* Push new found directory. */
 795                 $stack[] = $d . $node . '/';
 796             } elseif (is_file($d . $node)) {
 797                 /* Read link information. */
 798                 $l = jirafeau_get_link(basename($node));
 799                 if (!count($l)) {
 800                     continue;
 801                 }
 802                 $p = s2p($l['hash']);
 803                 if ($l['time'] > 0 && $l['time'] < time() || // expired
 804                     !file_exists(VAR_FILES . $p . $l['hash']) || // invalid
 805                     !file_exists(VAR_FILES . $p . $l['hash'] . '_count')) { // invalid
 806                     jirafeau_delete_link($node);
 807                     $count++;
 808                 }
 809             }
 810         }
 811     }
 812     return $count;
 813 }
 814
 815
 816 /**
 817  * Clean old async transfers.
 818  * @return number of cleaned files.
 819  */
 820 function jirafeau_admin_clean_async()
 821 {
 822     $count = 0;
 823     /* Get all links files. */
 824     $stack = array(VAR_ASYNC);
 825     while (($d = array_shift($stack)) && $d != null) {
 826         $dir = scandir($d);
 827
 828         foreach ($dir as $node) {
 829             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 830                 preg_match('/\.tmp/i', "$node")) {
 831                 continue;
 832             }
 833
 834             if (is_dir($d . $node)) {
 835                 /* Push new found directory. */
 836                 $stack[] = $d . $node . '/';
 837             } elseif (is_file($d . $node)) {
 838                 /* Read async information. */
 839                 $a = jirafeau_get_async_ref(basename($node));
 840                 if (!count($a)) {
 841                     continue;
 842                 }
 843                 /* Delete transfers older than 1 hour. */
 844                 if (time() - $a['last_edited'] > 3600) {
 845                     jirafeau_async_delete(basename($node));
 846                     $count++;
 847                 }
 848             }
 849         }
 850     }
 851     return $count;
 852 }
 853
 854 /**
 855  * Better strval function for debug purposes
 856  */
 857 function jirafeau_strval($value)
 858 {
 859     if (gettype($value) == "boolean") {
 860         return $value ? 'true' : 'false';
 861     }
 862     return strval($value);
 863 }
 864
 865 /**
 866  * Show file/folder permissions
 867  */
 868 function jirafeau_fileperms($path)
 869 {
 870     $out = substr(sprintf("%o", @fileperms($path)), -4) . ", ";
 871     $out .= "read " . (is_readable($path) ? "OK" : "KO") . ", ";
 872     $out .= "write " . (is_writable($path) ? "OK" : "KO");
 873     return $out;
 874 }
 875
 876 /**
 877  * Show some useful informations for bug reporting.
 878  */
 879 function jirafeau_admin_bug_report($cfg)
 880 {
 881     $out = "<fieldset><legend>" . t('REPORTING_AN_ISSUE') . "</legend>";
 882     $out .= "If you have a problem related to Jirafeau, please <a href='https://gitlab.com/mojo42/Jirafeau/-/issues'>open an issue</a>, explain your problem in english and copy-paste the following content:<br/><br/><code>";
 883
 884     $out .= "# Jirafeau<br/>";
 885     $out .= "- version: " . JIRAFEAU_VERSION . "<br/>";
 886     $jirafeau_options = [
 887         'debug',
 888         'file_hash',
 889         'litespeed_workaround',
 890         'store_uploader_ip',
 891         'installation_done',
 892         'enable_crypt',
 893         'preview',
 894         'maximal_upload_size',
 895         'store_uploader_ip',
 896         'max_upload_chunk_size_bytes'
 897     ];
 898     foreach ($jirafeau_options as &$o) {
 899         $v = $cfg[$o];
 900         $out .= "- $o: " . jirafeau_strval($v) . " (" . gettype($v) . ")<br/>";
 901     }
 902     $out .= "<br/>";
 903
 904     $out .= "# PHP options<br/>";
 905     $out .= "- php version: " . phpversion() . "<br/>";
 906     $out .= "- sodium version: " . phpversion('sodium') . "<br/>";
 907     $out .= "- mcrypt version: " . phpversion('mcrypt') . "<br/>";
 908     $php_options =  [
 909         'post_max_size',
 910         'upload_max_filesize',
 911         'safe_mode',
 912         'max_execution_time',
 913         'max_input_time'
 914     ];
 915     foreach ($php_options as &$o) {
 916         $v = ini_get($o);
 917         $out .= "- $o: " . jirafeau_strval($v) . " (" . gettype($v). ")<br/>";
 918     }
 919     $out .= "- can set_time_limit: " . (set_time_limit(0) ? "yes" : "no") . "<br/>";
 920     $out .= "<br/>";
 921
 922     $out .= "# File permissions<br/>";
 923     $out .= "- 'var' folder permissions: " . jirafeau_fileperms($cfg['var_root']) . "<br/>";
 924     $out .= "- 'file' folder permissions: " . jirafeau_fileperms(VAR_FILES) . "<br/>";
 925     $out .= "- 'links' folder permissions: " . jirafeau_fileperms(VAR_LINKS) . "<br/>";
 926     $out .= "- 'async' folder permissions: " . jirafeau_fileperms(VAR_ASYNC) . "<br/>";
 927     $out .= "<br/>";
 928
 929     $out .= "# Server details<br/>";
 930     $out .= "- server software: " . $_SERVER["SERVER_SOFTWARE"] . "<br/>";
 931     $out .= "<br/>";
 932
 933     $out .= "# OS details<br/>";
 934     $out .= "- OS: " . php_uname() . "<br/>";
 935     $out .= "<br/>";
 936
 937     $out .= "# Browser details<br/>";
 938     $out .= "<script type='text/javascript' lang='Javascript'>
 939         // @license magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt AGPL-v3-or-Later
 940         document.write('- html5 support: ' + (check_html5_file_api() ? 'yes' : 'no') + '<br/>');
 941         document.write('- user agent: ' + navigator.userAgent + '<br/>');
 942         // @license-end
 943         </script>";
 944     $out .= "<br/>";
 945
 946     $out .= "# Memory<br/>";
 947     $out .= "- memory_get_peak_usage: " . jirafeau_human_size(memory_get_peak_usage()) . "<br/>";
 948
 949     $out .= "</code></fieldset>";
 950     return $out;
 951 }
 952
 953 /**
 954  * Read async transfer information
 955  * @return array containing information.
 956  */
 957 function jirafeau_get_async_ref($ref)
 958 {
 959     $out = array();
 960     $refinfos = VAR_ASYNC . s2p("$ref") . "$ref";
 961
 962     if (!file_exists($refinfos)) {
 963         return $out;
 964     }
 965
 966     $c = file($refinfos);
 967     $out['file_name'] = trim($c[0]);
 968     $out['mime_type'] = trim($c[1]);
 969     $out['key'] = trim($c[2], NL);
 970     $out['time'] = trim($c[3]);
 971     $out['onetime'] = trim($c[4]);
 972     $out['ip'] = trim($c[5]);
 973     $out['last_edited'] = trim($c[6]);
 974     $out['next_code'] = trim($c[7]);
 975     return $out;
 976 }
 977
 978 /**
 979  * Delete async transfer information
 980  */
 981 function jirafeau_async_delete($ref)
 982 {
 983     $p = s2p("$ref");
 984     if (file_exists(VAR_ASYNC . $p . $ref)) {
 985         unlink(VAR_ASYNC . $p . $ref);
 986     }
 987     if (file_exists(VAR_ASYNC . $p . $ref . '_data')) {
 988         unlink(VAR_ASYNC . $p . $ref . '_data');
 989     }
 990     $parse = VAR_ASYNC . $p;
 991     $scan = array();
 992     while (file_exists($parse)
 993            && ($scan = scandir($parse))
 994            && count($scan) == 2 // '.' and '..' folders => empty.
 995            && basename($parse) != basename(VAR_ASYNC)) {
 996         rmdir($parse);
 997         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 998     }
 999 }
1000
1001 /**
1002   * Init a new asynchronous upload.
1003   * @param $filename Name of the file to send
1004   * @param $one_time One time upload parameter
1005   * @param $key eventual password (or blank)
1006   * @param $time time limit
1007   * @param $ip ip address of the client
1008   * @return a string containing a temporary reference followed by a code or a string starting with 'Error'
1009   */
1010 function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
1011 {
1012     /* Create temporary folder. */
1013     $ref;
1014     $p;
1015     $code = jirafeau_gen_random(4);
1016     do {
1017         $ref = jirafeau_gen_random(32);
1018         $p = VAR_ASYNC . s2p($ref);
1019     } while (file_exists($p));
1020     @mkdir($p, 0755, true);
1021     if (!file_exists($p)) {
1022         return 'Error: cannot create async folder.';
1023     }
1024
1025     /* touch empty data file */
1026     $w_path = $p . $ref . '_data';
1027     touch($w_path);
1028
1029     /* md5 password or empty */
1030     $password = '';
1031     if (!empty($key)) {
1032         $password = md5($key);
1033     }
1034
1035     /* Store information. */
1036     $p .= $ref;
1037     $handle = fopen($p, 'w');
1038     fwrite(
1039         $handle,
1040         str_replace(NL, '', trim($filename)) . NL .
1041             str_replace(NL, '', trim($type)) . NL . $password . NL .
1042             $time . NL . ($one_time ? 'O' : 'R') . NL . $ip . NL .
1043             time() . NL . $code . NL
1044     );
1045     fclose($handle);
1046
1047     return $ref . NL . $code ;
1048 }
1049
1050 /**
1051   * Append a piece of file on the asynchronous upload.
1052   * @param $ref asynchronous upload reference
1053   * @param $file piece of data
1054   * @param $code client code for this operation
1055   * @param $max_file_size maximum allowed file size
1056   * @return a string containing a next code to use or a string starting with 'Error'
1057   */
1058 function jirafeau_async_push($ref, $data, $code, $max_file_size)
1059 {
1060     /* Get async infos. */
1061     $a = jirafeau_get_async_ref($ref);
1062
1063     /* Check some errors. */
1064     if (count($a) == 0) {
1065         return "Error: cannot find transfer";
1066     }
1067     if ($a['next_code'] != "$code") {
1068         return "Error: bad transfer code";
1069     }
1070     if ($data['error'] != UPLOAD_ERR_OK) {
1071         // Check error code in https://www.php.net/manual/en/features.file-upload.errors.php
1072         $data_details = print_r($data, true);
1073         return "Error: upload error: {$data_details}";
1074     }
1075     if (empty($data['tmp_name'])) {
1076         return "Error: missing tmp_name";
1077     }
1078     if (!is_uploaded_file($data['tmp_name'])) {
1079         return "Error: tmp_name may not be uploaded";
1080     }
1081
1082     $p = s2p($ref);
1083
1084     /* File path. */
1085     $r_path = $data['tmp_name'];
1086     $w_path = VAR_ASYNC . $p . $ref . '_data';
1087
1088     /* Check that file size is not above upload limit. */
1089     if ($max_file_size > 0 &&
1090         filesize($r_path) + filesize($w_path) > $max_file_size * 1024 * 1024) {
1091         jirafeau_async_delete($ref);
1092         return "Error: file size is above upload limit";
1093     }
1094
1095     /* Concatenate data. */
1096     $r = fopen($r_path, 'r');
1097     $w = fopen($w_path, 'a');
1098     while (!feof($r)) {
1099         if (fwrite($w, fread($r, 1024)) === false) {
1100             fclose($r);
1101             fclose($w);
1102             jirafeau_async_delete($ref);
1103             return "Error: cannot write file";
1104         }
1105     }
1106     fclose($r);
1107     fclose($w);
1108     unlink($r_path);
1109
1110     /* Update async file. */
1111     $code = jirafeau_gen_random(4);
1112     $handle = fopen(VAR_ASYNC . $p . $ref, 'w');
1113     fwrite(
1114         $handle,
1115         $a['file_name'] . NL. $a['mime_type'] . NL. $a['key'] . NL .
1116             $a['time'] . NL . $a['onetime'] . NL . $a['ip'] . NL .
1117             time() . NL . $code . NL
1118     );
1119     fclose($handle);
1120     return $code;
1121 }
1122
1123 /**
1124   * Finalize an asynchronous upload.
1125   * @param $ref asynchronous upload reference
1126   * @param $code client code for this operation
1127   * @param $crypt boolean asking to crypt or not
1128   * @param $link_name_length link name length
1129   * @return a string containing the download reference followed by a delete code or a string starting with 'Error'
1130   */
1131 function jirafeau_async_end($ref, $code, $crypt, $link_name_length, $file_hash_method)
1132 {
1133     /* Get async infos. */
1134     $a = jirafeau_get_async_ref($ref);
1135     if (count($a) == 0
1136         || $a['next_code'] != "$code") {
1137         return "Error: bad code for ending transfer";
1138     }
1139
1140     /* Generate link infos. */
1141     $p = VAR_ASYNC . s2p($ref) . $ref . "_data";
1142     if (!file_exists($p)) {
1143         return "Error: referenced file does not exist";
1144     }
1145
1146     $crypted = false;
1147     $crypt_key = '';
1148     if ($crypt == true && extension_loaded('sodium') == true) {
1149         $crypt_key = jirafeau_encrypt_file($p, $p.'.crypt');
1150         if (strlen($crypt_key) > 0) {
1151             if (rename($p.'.crypt', $p) === true) {
1152                 $crypted = true;
1153             }
1154         }
1155     }
1156
1157     $hash = jirafeau_hash_file($file_hash_method, $p);
1158     $size = filesize($p);
1159     $np = s2p($hash);
1160     $delete_link_code = jirafeau_gen_random(5);
1161
1162     /* File already exist ? */
1163     if (!file_exists(VAR_FILES . $np)) {
1164         @mkdir(VAR_FILES . $np, 0755, true);
1165     }
1166     if (!file_exists(VAR_FILES . $np . $hash)) {
1167         rename($p, VAR_FILES . $np . $hash);
1168     }
1169
1170     /* Increment or create count file. */
1171     $counter = 0;
1172     if (file_exists(VAR_FILES . $np . $hash . '_count')) {
1173         $content = file(VAR_FILES . $np . $hash. '_count');
1174         $counter = trim($content[0]);
1175     }
1176     $counter++;
1177     $handle = fopen(VAR_FILES . $np . $hash. '_count', 'w');
1178     fwrite($handle, $counter);
1179     fclose($handle);
1180
1181     /* Create link. */
1182     $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
1183     $handle = fopen($link_tmp_name, 'w');
1184     fwrite(
1185         $handle,
1186         $a['file_name'] . NL . $a['mime_type'] . NL . $size . NL .
1187             $a['key'] . NL . $a['time'] . NL . $hash . NL . $a['onetime'] . NL .
1188             time() . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C2' : 'O')
1189     );
1190     fclose($handle);
1191     $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
1192     $l = s2p("$hash_link");
1193     if (!@mkdir(VAR_LINKS . $l, 0755, true)) {
1194         return "Error: cannot create folder in LINKS";
1195     }
1196     if (!rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
1197         return "Error: cannot rename file in LINKS";
1198     }
1199
1200     /* Clean async upload. */
1201     jirafeau_async_delete($ref);
1202     return $hash_link . NL . $delete_link_code . NL . urlencode($crypt_key);
1203 }
1204
1205 function jirafeau_crypt_create_iv($base, $size)
1206 {
1207     $iv = '';
1208     while (strlen($iv) < $size) {
1209         $iv = $iv . $base;
1210     }
1211     $iv = substr($iv, 0, $size);
1212     return $iv;
1213 }
1214
1215 /**
1216  * Crypt file using Sodium and returns decrypt key.
1217  * @param $fp_src file path to the file to crypt.
1218  * @param $fp_dst file path to the file to write crypted file (must not be the same).
1219  * @return decrypt key composed of the key and the iv separated by a point ('.')
1220  */
1221 function jirafeau_encrypt_file($fp_src, $fp_dst)
1222 {
1223     $fs = filesize($fp_src);
1224     if ($fs === false || $fs == 0 || extension_loaded('sodium') == false || $fp_src == $fp_dst) {
1225         return '';
1226     }
1227
1228     /* Generate key. */
1229     $crypt_key = bin2hex(random_bytes(SODIUM_CRYPTO_STREAM_XCHACHA20_KEYBYTES / 2));
1230     /* Init module. */
1231     [$crypt_state, $crypt_header] = sodium_crypto_secretstream_xchacha20poly1305_init_push($crypt_key);
1232     /* Crypt file. */
1233     $r = fopen($fp_src, 'rb');
1234     $w = fopen($fp_dst, 'wb');
1235     fwrite($w, $crypt_header);
1236
1237     for ($i = 0; $i < $fs; $i += JIRAFEAU_SODIUM_CHUNKSIZE) {
1238         $to_enc = fread($r, JIRAFEAU_SODIUM_CHUNKSIZE);
1239         $enc = sodium_crypto_secretstream_xchacha20poly1305_push($crypt_state, $to_enc);
1240
1241         if (fwrite($w, $enc) === false) {
1242            return '';
1243         }
1244     }
1245
1246     fclose($r);
1247     fclose($w);
1248
1249     /* Cleanup. */
1250     sodium_memzero($crypt_state);
1251
1252     return $crypt_key;
1253 }
1254
1255 /**
1256  * Decrypt file using Sodium.
1257  * @param $fp_src file path to the file to decrypt.
1258  * @param $fp_dst file path to the file to write decrypted file (must not be the same).
1259  * @param $k string composed of the key and the iv separated by a point ('.')
1260  * @return key used to decrypt. a string of length 0 is returned if failed.
1261  */
1262 function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
1263 {
1264     $fs = filesize($fp_src);
1265     if ($fs === false || $fs == 0 || extension_loaded('sodium') == false || $fp_src == $fp_dst) {
1266         return false;
1267     }
1268
1269     /* Decrypt file. */
1270     $r = fopen($fp_src, 'rb');
1271     $w = fopen($fp_dst, 'wb');
1272
1273     $crypt_header = fread($r, SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES);
1274
1275     /* Init module. */
1276     $crypt_state = sodium_crypto_secretstream_xchacha20poly1305_init_pull($crypt_header, $k);
1277
1278     /* Decrypt file. */
1279
1280     for ($i = SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES; $i < $fs; $i += JIRAFEAU_SODIUM_CHUNKSIZE + SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES) {
1281         $to_dec = fread($r, JIRAFEAU_SODIUM_CHUNKSIZE + SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES);
1282         [$dec, $crypt_tag] = sodium_crypto_secretstream_xchacha20poly1305_pull($crypt_state, $to_dec);
1283
1284         if (fwrite($w, $dec) === false) {
1285             return false;
1286         }
1287     }
1288
1289     fclose($r);
1290     fclose($w);
1291
1292     /* Cleanup. */
1293     sodium_memzero($crypt_state);
1294
1295     return true;
1296 }
1297
1298 /**
1299  * Decrypt file using mcrypt.
1300  * @param $fp_src file path to the file to decrypt.
1301  * @param $fp_dst file path to the file to write decrypted file (could be the same).
1302  * @param $k string composed of the key and the iv separated by a point ('.')
1303  * @return key used to decrypt. a string of length 0 is returned if failed.
1304  */
1305 function jirafeau_decrypt_file_legacy($fp_src, $fp_dst, $k)
1306 {
1307     $fs = filesize($fp_src);
1308     if ($fs === false || $fs == 0 || extension_loaded('mcrypt') == false) {
1309         return false;
1310     }
1311
1312     /* Init module */
1313     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1314     /* Extract key and iv. */
1315     $crypt_key = $k;
1316     $hash_key = md5($crypt_key);
1317     $iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
1318     /* Decrypt file. */
1319     $r = fopen($fp_src, 'r');
1320     $w = fopen($fp_dst, 'c');
1321     while (!feof($r)) {
1322         $dec = mdecrypt_generic($m, fread($r, 1024));
1323         if (fwrite($w, $dec) === false) {
1324             return false;
1325         }
1326     }
1327     fclose($r);
1328     fclose($w);
1329     /* Cleanup. */
1330     mcrypt_generic_deinit($m);
1331     mcrypt_module_close($m);
1332     return true;
1333 }
1334
1335 /**
1336  * Check if Jirafeau is password protected for visitors.
1337  * @return true if Jirafeau is password protected, false otherwise.
1338  */
1339 function jirafeau_has_upload_password($cfg)
1340 {
1341     return count($cfg['upload_password']) > 0;
1342 }
1343
1344 /**
1345  * Challenge password for a visitor.
1346  * @param $password password to be challenged
1347  * @return true if password is valid, false otherwise.
1348  */
1349 function jirafeau_challenge_upload_password($cfg, $password)
1350 {
1351     if (!jirafeau_has_upload_password($cfg)) {
1352         return false;
1353     }
1354     foreach ($cfg['upload_password'] as $p) {
1355         if ($password == $p) {
1356             return true;
1357         }
1358     }
1359     return false;
1360 }
1361
1362 /**
1363  * Test if the given IP is whitelisted by the given list.
1364  *
1365  * @param $allowedIpList array of allowed IPs
1366  * @param $challengedIp IP to be challenged
1367  * @return true if IP is authorized, false otherwise.
1368  */
1369 function jirafeau_challenge_ip($allowedIpList, $challengedIp)
1370 {
1371     foreach ($allowedIpList as $i) {
1372         if ($i == $challengedIp) {
1373             return true;
1374         }
1375         // CIDR test for IPv4 only.
1376         if (strpos($i, '/') !== false) {
1377             list($subnet, $mask) = explode('/', $i);
1378             if ((ip2long($challengedIp) & ~((1 << (32 - $mask)) - 1)) == ip2long($subnet)) {
1379                 return true;
1380             }
1381         }
1382     }
1383     return false;
1384 }
1385
1386 /**
1387  * Check if Jirafeau has a restriction on the IP address for uploading.
1388  * @return true if uploading is IP restricted, false otherwise.
1389  */
1390 function jirafeau_upload_has_ip_restriction($cfg)
1391 {
1392     return count($cfg['upload_ip']) > 0;
1393 }
1394
1395 /**
1396  * Test if visitor's IP is authorized to upload at all.
1397  *
1398  * @param $cfg configuration
1399  * @param $challengedIp IP to be challenged
1400  * @return true if IP is authorized, false otherwise.
1401  */
1402 function jirafeau_challenge_upload_ip($cfg, $challengedIp)
1403 {
1404     // If no IP address have been listed, allow upload from any IP
1405     if (!jirafeau_upload_has_ip_restriction($cfg)) {
1406         return true;
1407     }
1408     return jirafeau_challenge_ip($cfg['upload_ip'], $challengedIp);
1409 }
1410
1411 /**
1412  * Test if visitor's IP is authorized to upload without a password.
1413  *
1414  * @param $cfg configuration
1415  * @param $challengedIp IP to be challenged
1416  * @return true if IP is authorized, false otherwise.
1417  */
1418 function jirafeau_challenge_upload_ip_without_password($cfg, $challengedIp)
1419 {
1420     return jirafeau_challenge_ip($cfg['upload_ip_nopassword'], $challengedIp);
1421 }
1422
1423 /**
1424  * Test if visitor's IP is authorized or password is supplied and authorized
1425  * @param $ip IP to be challenged
1426  * @param $password password to be challenged
1427  * @return true if access is valid, false otherwise.
1428  */
1429 function jirafeau_challenge_upload($cfg, $ip, $password)
1430 {
1431     return jirafeau_challenge_upload_ip_without_password($cfg, $ip) ||
1432             (!jirafeau_has_upload_password($cfg) && !jirafeau_upload_has_ip_restriction($cfg)) ||
1433             (jirafeau_challenge_upload_password($cfg, $password) && jirafeau_challenge_upload_ip($cfg, $ip));
1434 }
1435
1436 /**
1437  * Check if Jirafeau has a restriction on the IP address for accessing the admin interface.
1438  * @return true if admin interface is IP restricted, false otherwise.
1439  */
1440 function jirafeau_admin_has_ip_restriction($cfg)
1441 {
1442     return count($cfg['admin_ip']) > 0;
1443 }
1444
1445 /**
1446  * Test if visitor's IP is authorized to access the admin interface.
1447  *
1448  * @param $cfg configuration
1449  * @param $challengedIp IP to be challenged
1450  * @return true if IP is authorized, false otherwise.
1451  */
1452 function jirafeau_challenge_admin_ip($cfg, $challengedIp)
1453 {
1454     // If no IP address have been listed, allow upload from any IP
1455     if (!jirafeau_admin_has_ip_restriction($cfg)) {
1456         return true;
1457     }
1458     return jirafeau_challenge_ip($cfg['admin_ip'], $challengedIp);
1459 }
1460
1461 /** Tell if we have some HTTP headers generated by a proxy */
1462 function has_http_forwarded()
1463 {
1464     return
1465         !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ||
1466         !empty($_SERVER['http_X_forwarded_for']);
1467 }
1468
1469 /**
1470  * Generate IP list from HTTP headers generated by a proxy
1471  * @return  array of IP strings
1472  */
1473 function get_ip_list_http_forwarded()
1474 {
1475     $ip_list = array();
1476     if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
1477         $l = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
1478         if ($l === false) {
1479             return array();
1480         }
1481         foreach ($l as $ip) {
1482             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1483         }
1484     }
1485     if (!empty($_SERVER['http_X_forwarded_for'])) {
1486         $l = explode(',', $_SERVER['http_X_forwarded_for']);
1487         foreach ($l as $ip) {
1488             // Separate IP from port
1489             $ipa = explode(':', $ip);
1490             if ($ipa === false) {
1491                 continue;
1492             }
1493             $ip = $ipa[0];
1494             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1495         }
1496     }
1497     return $ip_list;
1498 }
1499
1500 /**
1501  * Get the ip address of the client from REMOTE_ADDR
1502  * or from HTTP_X_FORWARDED_FOR if behind a proxy
1503  * @returns the client ip address
1504  */
1505 function get_ip_address($cfg)
1506 {
1507     $remote = $_SERVER['REMOTE_ADDR'];
1508     if (count($cfg['proxy_ip']) == 0 || !has_http_forwarded()) {
1509         return $remote;
1510     }
1511
1512     $ip_list = get_ip_list_http_forwarded();
1513     if (count($ip_list) == 0) {
1514         return $remote;
1515     }
1516
1517     foreach ($cfg['proxy_ip'] as $proxy_ip) {
1518         if ($remote != $proxy_ip) {
1519             continue;
1520         }
1521         // Take the last IP (the one which has been set by the defined proxy).
1522         return end($ip_list);
1523     }
1524     return $remote;
1525 }
1526
1527 /**
1528  * Convert hexadecimal string to base64
1529  */
1530 function hex_to_base64($hex)
1531 {
1532     $b = '';
1533     foreach (str_split($hex, 2) as $pair) {
1534         $b .= chr(hexdec($pair));
1535     }
1536     return base64_encode($b);
1537 }
1538
1539 /**
1540  * Replace markers in templates.
1541  *
1542  * Available markers have the scheme "###MARKERNAME###".
1543  *
1544  * @param $content string Template text with markers
1545  * @param $htmllinebreaks boolean Convert linebreaks to BR-Tags
1546  * @return Template with replaced markers
1547  */
1548 function jirafeau_replace_markers($content, $htmllinebreaks = false)
1549 {
1550     $patterns = array(
1551         '/###ORGANISATION###/',
1552         '/###CONTACTPERSON###/',
1553         '/###WEBROOT###/'
1554     );
1555     $replacements = array(
1556         $GLOBALS['cfg']['organisation'],
1557         $GLOBALS['cfg']['contactperson'],
1558         $GLOBALS['cfg']['web_root']
1559     );
1560     $content = preg_replace($patterns, $replacements, $content);
1561
1562     if (true === $htmllinebreaks) {
1563         $content = nl2br($content);
1564     }
1565
1566     return $content;
1567 }
1568
1569 function jirafeau_escape($string)
1570 {
1571     return htmlspecialchars($string, ENT_QUOTES);
1572 }
1573
1574 function jirafeau_admin_session_start()
1575 {
1576     $_SESSION['admin_auth'] = true;
1577     $_SESSION['admin_csrf'] = md5(uniqid(mt_rand(), true));
1578 }
1579
1580 function jirafeau_session_end()
1581 {
1582     $_SESSION = array();
1583     session_destroy();
1584 }
1585
1586 function jirafeau_admin_session_logged()
1587 {
1588     return isset($_SESSION['admin_auth']) &&
1589            isset($_SESSION['admin_csrf']) &&
1590            isset($_POST['admin_csrf']) &&
1591            $_SESSION['admin_auth'] === true &&
1592            $_SESSION['admin_csrf'] === $_POST['admin_csrf'];
1593 }
1594
1595 function jirafeau_admin_csrf_field()
1596 {
1597     return "<input type='hidden' name='admin_csrf' value='". $_SESSION['admin_csrf'] . "'/>";
1598 }
1599
1600 function jirafeau_user_session_start()
1601 {
1602     $_SESSION['user_auth'] = true;
1603 }
1604
1605 function jirafeau_user_session_logged()
1606 {
1607     return isset($_SESSION['user_auth']) &&
1608         $_SESSION['user_auth'] === true;
1609 }
1610
1611 function jirafeau_dir_size($dir)
1612 {
1613     $size = 0;
1614     foreach (glob(rtrim($dir, '/').'/*', GLOB_NOSORT) as $entry) {
1615         $size += is_file($entry) ? filesize($entry) : jirafeau_dir_size($entry);
1616     }
1617     return $size;
1618 }
1619
1620 function jirafeau_export_cfg($cfg)
1621 {
1622     $content = '<?php' . NL;
1623     $content .= '/* This file was generated by the install process. ' .
1624                'You can edit it. Please see config.original.php to understand the ' .
1625                'configuration items. */' . NL;
1626     $content .= '$cfg = ' . var_export($cfg, true) . ';';
1627
1628     $fileWrite = file_put_contents(JIRAFEAU_CFG, $content);
1629
1630     if (false === $fileWrite) {
1631         jirafeau_fatal_error(t('Can not write local configuration file'));
1632     }
1633 }
1634
1635 function jirafeau_mkdir($path)
1636 {
1637     return !(!file_exists($path) && !@mkdir($path, 0755));
1638 }
1639
1640 /**
1641  * Returns true whether the path is writable or we manage to make it
1642  * so, which essentially is the same thing.
1643  * @param $path is the file or directory to be tested.
1644  * @return true if $path is writable.
1645  */
1646 function jirafeau_is_writable($path)
1647 {
1648     /* "@" gets rid of error messages. */
1649     return is_writable($path) || @chmod($path, 0777);
1650 }
1651
1652 function jirafeau_check_var_dir($path)
1653 {
1654     $mkdir_str1 = t('CANNOT_CREATE_DIR') . ':';
1655     $mkdir_str2 = t('MANUAL_CREATE');
1656     $write_str1 = t('DIR_NOT_W') . ':';
1657     $write_str2 = t('You should give the write permission to the web server on ' .
1658                     'this directory.');
1659     $solution_str = t('HERE_SOLUTION') . ':';
1660
1661     if (!jirafeau_mkdir($path) || !jirafeau_is_writable($path)) {
1662         return array('has_error' => true,
1663                       'why' => $mkdir_str1 . '<br /><code>' .
1664                                $path . '</code><br />' . $solution_str .
1665                                '<br />' . $mkdir_str2);
1666     }
1667
1668     foreach (array('files', 'links', 'async') as $subdir) {
1669         $subpath = $path.$subdir;
1670
1671         if (!jirafeau_mkdir($subpath) || !jirafeau_is_writable($subpath)) {
1672             return array('has_error' => true,
1673                           'why' => $mkdir_str1 . '<br /><code>' .
1674                                    $subpath . '</code><br />' . $solution_str .
1675                                    '<br />' . $mkdir_str2);
1676         }
1677     }
1678
1679     return array('has_error' => false, 'why' => '');
1680 }
1681
1682 function jirafeau_add_ending_slash($path)
1683 {
1684     return $path . ((substr($path, -1) == '/') ? '' : '/');
1685 }
1686
1687 function jirafeau_default_web_root()
1688 {
1689     $url_scheme = (isset($_SERVER['HTTPS'])) ? 'https://' : 'http://';
1690     return $url_scheme . $_SERVER['HTTP_HOST'] . str_replace('install.php', '', $_SERVER['REQUEST_URI']);
1691 }
1692
1693 function jirafeau_get_download_stats($hash)
1694 {
1695     $filename = VAR_LINKS . s2p("$hash") . $hash . '_download';
1696
1697     if (!file_exists($filename)) {
1698         return array('count'=>0);
1699     }
1700
1701     $c = file($filename);
1702     $data['count'] = trim($c[0]);
1703     $data['date'] = trim($c[1]);
1704     $data['ip'] = trim($c[2]);
1705
1706     return $data;
1707 }
1708
1709 function jirafeau_write_download_stats($hash, $ip)
1710 {
1711     $data = jirafeau_get_download_stats($hash);
1712     $count = $data['count'];
1713     $count++;
1714
1715     $filename = VAR_LINKS . s2p("$hash") . $hash . '_download';
1716
1717     $handle = fopen($filename, 'w');
1718     fwrite($handle, $count . NL . time() . NL . $ip);
1719     fclose($handle);
1720 }