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 seperating 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 $code;
 102 }
 103
 104 function is_ssl()
 105 {
 106     if (isset($_SERVER['HTTPS'])) {
 107         if ('on' == strtolower($_SERVER['HTTPS']) ||
 108              '1' == $_SERVER['HTTPS']) {
 109             return true;
 110         }
 111     } elseif (isset($_SERVER['SERVER_PORT']) && ('443' == $_SERVER['SERVER_PORT'])) {
 112         return true;
 113     } elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
 114         if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
 115             return true;
 116         }
 117     }
 118     return false;
 119 }
 120
 121 function jirafeau_human_size($octets)
 122 {
 123     $u = array('B', 'KB', 'MB', 'GB', 'TB');
 124     $o = max($octets, 0);
 125     $p = min(floor(($o ? log($o) : 0) / log(1024)), count($u) - 1);
 126     $o /= pow(1024, $p);
 127     return round($o, 1) . $u[$p];
 128 }
 129
 130 // Convert UTC timestamp to a datetime field
 131 function jirafeau_get_datetimefield($timestamp)
 132 {
 133     $content = '<span class="datetime" data-datetime="' . strftime('%Y-%m-%d %H:%M', $timestamp) . '">'
 134         . strftime('%Y-%m-%d %H:%M', $timestamp) . ' (GMT)</span>';
 135     return $content;
 136 }
 137
 138 function jirafeau_fatal_error($errorText, $cfg = array())
 139 {
 140     echo '<div class="error"><h2>Error</h2><p>' . $errorText . '</p></div>';
 141     require(JIRAFEAU_ROOT . 'lib/template/footer.php');
 142     exit;
 143 }
 144
 145 function jirafeau_clean_rm_link($link)
 146 {
 147     $p = s2p("$link");
 148     if (file_exists(VAR_LINKS . $p . $link)) {
 149         unlink(VAR_LINKS . $p . $link);
 150     }
 151     $parse = VAR_LINKS . $p;
 152     $scan = array();
 153     while (file_exists($parse)
 154            && ($scan = scandir($parse))
 155            && count($scan) == 2 // '.' and '..' folders => empty.
 156            && basename($parse) != basename(VAR_LINKS)) {
 157         rmdir($parse);
 158         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 159     }
 160 }
 161
 162 function jirafeau_clean_rm_file($hash)
 163 {
 164     $p = s2p("$hash");
 165     $f = VAR_FILES . $p . $hash;
 166     if (file_exists($f) && is_file($f)) {
 167         unlink($f);
 168     }
 169     if (file_exists($f . '_count') && is_file($f . '_count')) {
 170         unlink($f . '_count');
 171     }
 172     $parse = VAR_FILES . $p;
 173     $scan = array();
 174     while (file_exists($parse)
 175            && ($scan = scandir($parse))
 176            && count($scan) == 2 // '.' and '..' folders => empty.
 177            && basename($parse) != basename(VAR_FILES)) {
 178         rmdir($parse);
 179         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 180     }
 181 }
 182
 183 /**
 184  * transforms a php.ini string representing a value in an integer
 185  * @param $value the value from php.ini
 186  * @returns an integer for this value
 187  */
 188 function jirafeau_ini_to_bytes($value)
 189 {
 190     $modifier = substr($value, -1);
 191     $bytes = substr($value, 0, -1);
 192     switch (strtoupper($modifier)) {
 193     case 'P':
 194         $bytes *= 1024;
 195     case 'T':
 196         $bytes *= 1024;
 197     case 'G':
 198         $bytes *= 1024;
 199     case 'M':
 200         $bytes *= 1024;
 201     case 'K':
 202         $bytes *= 1024;
 203     }
 204     return $bytes;
 205 }
 206
 207 /**
 208  * gets the maximum upload size according to php.ini
 209  * @returns the maximum upload size in bytes
 210  */
 211 function jirafeau_get_max_upload_size_bytes()
 212 {
 213     return min(jirafeau_ini_to_bytes(ini_get('post_max_size')),
 214                jirafeau_ini_to_bytes(ini_get('upload_max_filesize')));
 215 }
 216
 217 /**
 218  * gets the maximum upload size according to php.ini
 219  * @returns the maximum upload size string
 220  */
 221 function jirafeau_get_max_upload_size()
 222 {
 223     return jirafeau_human_size(jirafeau_get_max_upload_size_bytes());
 224 }
 225
 226 /**
 227  * gets a string explaining the error
 228  * @param $code the error code
 229  * @returns a string explaining the error
 230  */
 231 function jirafeau_upload_errstr($code)
 232 {
 233     switch ($code) {
 234     case UPLOAD_ERR_INI_SIZE:
 235     case UPLOAD_ERR_FORM_SIZE:
 236         return t('Your file exceeds the maximum authorized file size. ');
 237
 238     case UPLOAD_ERR_PARTIAL:
 239     case UPLOAD_ERR_NO_FILE:
 240         return
 241             t('Your file was not uploaded correctly. You may succeed in retrying. ');
 242
 243     case UPLOAD_ERR_NO_TMP_DIR:
 244     case UPLOAD_ERR_CANT_WRITE:
 245     case UPLOAD_ERR_EXTENSION:
 246         return t('Internal error. You may not succeed in retrying. ');
 247     }
 248     return t('Unknown error. ');
 249 }
 250
 251 /** Remove link and it's file
 252  * @param $link the link's name (hash)
 253  */
 254
 255 function jirafeau_delete_link($link)
 256 {
 257     $l = jirafeau_get_link($link);
 258     if (!count($l)) {
 259         return;
 260     }
 261
 262     jirafeau_clean_rm_link($link);
 263
 264     $hash = $l['hash'];
 265     $p = s2p("$hash");
 266
 267     $counter = 1;
 268     if (file_exists(VAR_FILES . $p . $hash. '_count')) {
 269         $content = file(VAR_FILES . $p . $hash. '_count');
 270         $counter = trim($content[0]);
 271     }
 272     $counter--;
 273
 274     if ($counter >= 1) {
 275         $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 276         fwrite($handle, $counter);
 277         fclose($handle);
 278     }
 279
 280     if ($counter == 0) {
 281         jirafeau_clean_rm_file($hash);
 282     }
 283 }
 284
 285 /**
 286  * Delete a file and it's links.
 287  */
 288 function jirafeau_delete_file($hash)
 289 {
 290     $count = 0;
 291     /* Get all links files. */
 292     $stack = array(VAR_LINKS);
 293     while (($d = array_shift($stack)) && $d != null) {
 294         $dir = scandir($d);
 295
 296         foreach ($dir as $node) {
 297             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 298                 preg_match('/\.tmp/i', "$node")) {
 299                 continue;
 300             }
 301
 302             if (is_dir($d . $node)) {
 303                 /* Push new found directory. */
 304                 $stack[] = $d . $node . '/';
 305             } elseif (is_file($d . $node)) {
 306                 /* Read link informations. */
 307                 $l = jirafeau_get_link(basename($node));
 308                 if (!count($l)) {
 309                     continue;
 310                 }
 311                 if ($l['hash'] == $hash) {
 312                     $count++;
 313                     jirafeau_delete_link($node);
 314                 }
 315             }
 316         }
 317     }
 318     jirafeau_clean_rm_file($hash);
 319     return $count;
 320 }
 321
 322
 323 /** hash file's content
 324  * @param $method hash method, see 'file_hash' option. Valid methods are 'md5', 'md5_outside' or 'random'
 325  * @param $file_path file to hash
 326  * @returns hash string
 327  */
 328 function jirafeau_hash_file($method, $file_path)
 329 {
 330     switch ($method) {
 331         case 'md5_outside':
 332             return jirafeau_md5_outside($file_path);
 333         case 'md5':
 334             return md5_file($file_path);
 335         case 'random':
 336             return jirafeau_gen_random(32);
 337     }
 338     return md5_file($file_path);
 339 }
 340
 341 /** hash part of file: start, end and size.
 342  * This is a partial file hash, faster but weaker.
 343  * @param $file_path file to hash
 344  * @returns hash string
 345  */
 346 function jirafeau_md5_outside($file_path)
 347 {
 348     $out = false;
 349     $handle = fopen($file_path, "r");
 350     if ($handle === false) {
 351         return false;
 352     }
 353     $size = filesize($file_path);
 354     if ($size === false) {
 355         goto err;
 356     }
 357     $first = fread($handle, 64);
 358     if ($first === false) {
 359         goto err;
 360     }
 361     if (fseek($handle, $size < 64 ? 0 : $size - 64) == -1) {
 362         goto err;
 363     }
 364     $last = fread($handle, 64);
 365     if ($last === false) {
 366         goto err;
 367     }
 368     $out = md5($first . $last . $size);
 369     err:
 370     fclose($handle);
 371     return $out;
 372 }
 373
 374 /**
 375  * handles an uploaded file
 376  * @param $file the file struct given by $_FILE[]
 377  * @param $one_time_download is the file a one time download ?
 378  * @param $key if not empty, protect the file with this key
 379  * @param $time the time of validity of the file
 380  * @param $ip uploader's ip
 381  * @param $crypt boolean asking to crypt or not
 382  * @param $link_name_length size of the link name
 383  * @returns an array containing some information
 384  *   'error' => information on possible errors
 385  *   'link' => the link name of the uploaded file
 386  *   'delete_link' => the link code to delete file
 387  */
 388 function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $link_name_length, $file_hash_method)
 389 {
 390     if (empty($file['tmp_name']) || !is_uploaded_file($file['tmp_name'])) {
 391         return (array(
 392                  'error' =>
 393                    array('has_error' => true,
 394                           'why' => jirafeau_upload_errstr($file['error'])),
 395                  'link' => '',
 396                  'delete_link' => ''));
 397     }
 398
 399     /* array representing no error */
 400     $noerr = array('has_error' => false, 'why' => '');
 401
 402     /* Crypt file if option is enabled. */
 403     $crypted = false;
 404     $crypt_key = '';
 405     if ($crypt == true && !(extension_loaded('mcrypt') == true)) {
 406         error_log("PHP extension mcrypt not loaded, won't encrypt in Jirafeau");
 407     }
 408     if ($crypt == true && extension_loaded('mcrypt') == true) {
 409         $crypt_key = jirafeau_encrypt_file($file['tmp_name'], $file['tmp_name']);
 410         if (strlen($crypt_key) > 0) {
 411             $crypted = true;
 412         }
 413     }
 414
 415     /* file informations */
 416     $hash = jirafeau_hash_file($file_hash_method, $file['tmp_name']);
 417     $name = str_replace(NL, '', trim($file['name']));
 418     $mime_type = $file['type'];
 419     $size = $file['size'];
 420
 421     /* does file already exist ? */
 422     $rc = false;
 423     $p = s2p("$hash");
 424     if (file_exists(VAR_FILES . $p .  $hash)) {
 425         $rc = unlink($file['tmp_name']);
 426     } elseif ((file_exists(VAR_FILES . $p) || @mkdir(VAR_FILES . $p, 0755, true))
 427             && move_uploaded_file($file['tmp_name'], VAR_FILES . $p . $hash)) {
 428         $rc = true;
 429     }
 430     if (!$rc) {
 431         return (array(
 432                  'error' =>
 433                    array('has_error' => true,
 434                           'why' => t('INTERNAL_ERROR_DEL')),
 435                  'link' =>'',
 436                  'delete_link' => ''));
 437     }
 438
 439     /* Increment or create count file. */
 440     $counter = 0;
 441     if (file_exists(VAR_FILES . $p . $hash . '_count')) {
 442         $content = file(VAR_FILES . $p . $hash. '_count');
 443         $counter = trim($content[0]);
 444     }
 445     $counter++;
 446     $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 447     fwrite($handle, $counter);
 448     fclose($handle);
 449
 450     /* Create delete code. */
 451     $delete_link_code = jirafeau_gen_random(5);
 452
 453     /* hash password or empty. */
 454     $password = '';
 455     if (!empty($key)) {
 456         $password = md5($key);
 457     }
 458
 459     /* create link file */
 460     $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
 461     $handle = fopen($link_tmp_name, 'w');
 462     fwrite($handle,
 463             $name . NL. $mime_type . NL. $size . NL. $password . NL. $time .
 464             NL . $hash. NL . ($one_time_download ? 'O' : 'R') . NL . time() .
 465             NL . $ip . NL. $delete_link_code . NL . ($crypted ? 'C' : 'O'));
 466     fclose($handle);
 467     $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 468     $l = s2p("$hash_link");
 469     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 470         !rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
 471         if (file_exists($link_tmp_name)) {
 472             unlink($link_tmp_name);
 473         }
 474
 475         $counter--;
 476         if ($counter >= 1) {
 477             $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 478             fwrite($handle, $counter);
 479             fclose($handle);
 480         } else {
 481             jirafeau_clean_rm_file($hash_link);
 482         }
 483         return array(
 484                  'error' =>
 485                    array('has_error' => true,
 486                           'why' => t('Internal error during file creation. ')),
 487                  'link' =>'',
 488                  'delete_link' => '');
 489     }
 490     return array( 'error' => $noerr,
 491                   'link' => $hash_link,
 492                   'delete_link' => $delete_link_code,
 493                   'crypt_key' => $crypt_key);
 494 }
 495
 496 /**
 497  * Tells if a mime-type is viewable in a browser
 498  * @param $mime the mime type
 499  * @returns a boolean telling if a mime type is viewable
 500  */
 501 function jirafeau_is_viewable($mime)
 502 {
 503     if (!empty($mime)) {
 504         /* Actually, verify if mime-type is an image or a text. */
 505         $viewable = array('image', 'text', 'video', 'audio');
 506         $decomposed = explode('/', $mime);
 507         return in_array($decomposed[0], $viewable);
 508     }
 509     return false;
 510 }
 511
 512 // Error handling functions.
 513 //! Global array that contains all registered errors.
 514 $error_list = array();
 515
 516 /**
 517  * Adds an error to the list of errors.
 518  * @param $title the error's title
 519  * @param $description is a human-friendly description of the problem.
 520  */
 521 function add_error($title, $description)
 522 {
 523     global $error_list;
 524     $error_list[] = '<p>' . $title. '<br />' . $description. '</p>';
 525 }
 526
 527 /**
 528  * Informs whether any error has been registered yet.
 529  * @return true if there are errors.
 530  */
 531 function has_error()
 532 {
 533     global $error_list;
 534     return !empty($error_list);
 535 }
 536
 537 /**
 538  * Displays all the errors.
 539  */
 540 function show_errors()
 541 {
 542     if (has_error()) {
 543         global $error_list;
 544         echo '<div class="error">';
 545         foreach ($error_list as $error) {
 546             echo $error;
 547         }
 548         echo '</div>';
 549     }
 550 }
 551
 552 function check_errors($cfg)
 553 {
 554     if (file_exists(JIRAFEAU_ROOT . 'install.php')
 555         && !($cfg['installation_done'] === true)) {
 556         header('Location: install.php');
 557         exit;
 558     }
 559
 560     /* Checking for errors. */
 561     if (!is_writable(VAR_FILES)) {
 562         add_error(t('FILE_DIR_W'), VAR_FILES);
 563     }
 564
 565     if (!is_writable(VAR_LINKS)) {
 566         add_error(t('LINK_DIR_W'), VAR_LINKS);
 567     }
 568
 569     if (!is_writable(VAR_ASYNC)) {
 570         add_error(t('ASYNC_DIR_W'), VAR_ASYNC);
 571     }
 572
 573     if ($cfg['enable_crypt'] && $cfg['litespeed_workaround']) {
 574         add_error(t('INCOMPATIBLE_OPTIONS_W'), 'enable_crypt=true<br>litespeed_workaround=true');
 575     }
 576
 577     if ($cfg['one_time_download'] && $cfg['litespeed_workaround']) {
 578         add_error(t('INCOMPATIBLE_OPTIONS_W'), 'one_time_download=true<br>litespeed_workaround=true');
 579     }
 580 }
 581
 582 /**
 583  * Read link informations
 584  * @return array containing informations.
 585  */
 586 function jirafeau_get_link($hash)
 587 {
 588     $out = array();
 589     $link = VAR_LINKS . s2p("$hash") . $hash;
 590
 591     if (!file_exists($link)) {
 592         return $out;
 593     }
 594
 595     $c = file($link);
 596     $out['file_name'] = trim($c[0]);
 597     $out['mime_type'] = trim($c[1]);
 598     $out['file_size'] = trim($c[2]);
 599     $out['key'] = trim($c[3], NL);
 600     $out['time'] = trim($c[4]);
 601     $out['hash'] = trim($c[5]);
 602     $out['onetime'] = trim($c[6]);
 603     $out['upload_date'] = trim($c[7]);
 604     $out['ip'] = trim($c[8]);
 605     $out['link_code'] = trim($c[9]);
 606     $out['crypted'] = trim($c[10]) == 'C';
 607
 608     return $out;
 609 }
 610
 611 /**
 612  * List files in admin interface.
 613  */
 614 function jirafeau_admin_list($name, $file_hash, $link_hash)
 615 {
 616     echo '<fieldset><legend>';
 617     if (!empty($name)) {
 618         echo t('FILENAME') . ": " . jirafeau_escape($name);
 619     }
 620     if (!empty($file_hash)) {
 621         echo t('FILE') . ": " . jirafeau_escape($file_hash);
 622     }
 623     if (!empty($link_hash)) {
 624         echo t('LINK') . ": " . jirafeau_escape($link_hash);
 625     }
 626     if (empty($name) && empty($file_hash) && empty($link_hash)) {
 627         echo t('LS_FILES');
 628     }
 629     echo '</legend>';
 630     echo '<table border="1" width="1100">';
 631     echo '<tr>';
 632     echo '<th>' . t('FILENAME') . '</th>';
 633     echo '<th>' . t('TYPE') . '</th>';
 634     echo '<th>' . t('SIZE') . '</th>';
 635     echo '<th>' . t('EXPIRE') . '</th>';
 636     echo '<th>' . t('ONETIME') . '</th>';
 637     echo '<th>' . t('UPLOAD_DATE') . '</th>';
 638     echo '<th>' . t('ORIGIN') . '</th>';
 639     echo '<th>' . t('ACTION') . '</th>';
 640     echo '</tr>';
 641
 642     /* Get all links files. */
 643     $stack = array(VAR_LINKS);
 644     while (($d = array_shift($stack)) && $d != null) {
 645         $dir = scandir($d);
 646         foreach ($dir as $node) {
 647             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 648                 preg_match('/\.tmp/i', "$node")) {
 649                 continue;
 650             }
 651             if (is_dir($d . $node)) {
 652                 /* Push new found directory. */
 653                 $stack[] = $d . $node . '/';
 654             } elseif (is_file($d . $node)) {
 655                 /* Read link informations. */
 656                 $l = jirafeau_get_link($node);
 657                 if (!count($l)) {
 658                     continue;
 659                 }
 660
 661                 /* Filter. */
 662                 if (!empty($name) && !@preg_match("/$name/i", jirafeau_escape($l['file_name']))) {
 663                     continue;
 664                 }
 665                 if (!empty($file_hash) && $file_hash != $l['hash']) {
 666                     continue;
 667                 }
 668                 if (!empty($link_hash) && $link_hash != $node) {
 669                     continue;
 670                 }
 671                 /* Print link informations. */
 672                 echo '<tr>';
 673                 echo '<td>' .
 674                 '<strong><a id="upload_link" href="f.php?h='. jirafeau_escape($node) .'" title="' .
 675                     t('DL_PAGE') . '">' . jirafeau_escape($l['file_name']) . '</a></strong>';
 676                 echo '</td>';
 677                 echo '<td>' . jirafeau_escape($l['mime_type']) . '</td>';
 678                 echo '<td>' . jirafeau_human_size($l['file_size']) . '</td>';
 679                 echo '<td>' . ($l['time'] == -1 ? '∞' : jirafeau_get_datetimefield($l['time'])) . '</td>';
 680                 echo '<td>';
 681                 if ($l['onetime'] == 'O') {
 682                     echo 'Y';
 683                 } else {
 684                     echo 'N';
 685                 }
 686                 echo '</td>';
 687                 echo '<td>' . jirafeau_get_datetimefield($l['upload_date']) . '</td>';
 688                 echo '<td>' . $l['ip'] . '</td>';
 689                 echo '<td>' .
 690                 '<form method="post">' .
 691                 '<input type = "hidden" name = "action" value = "download"/>' .
 692                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 693                 jirafeau_admin_csrf_field() .
 694                 '<input type = "submit" value = "' . t('DL') . '" />' .
 695                 '</form>' .
 696                 '<form method="post">' .
 697                 '<input type = "hidden" name = "action" value = "delete_link"/>' .
 698                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 699                 jirafeau_admin_csrf_field() .
 700                 '<input type = "submit" value = "' . t('DEL_LINK') . '" />' .
 701                 '</form>' .
 702                 '<form method="post">' .
 703                 '<input type = "hidden" name = "action" value = "delete_file"/>' .
 704                 '<input type = "hidden" name = "hash" value = "' . $l['hash'] . '"/>' .
 705                 jirafeau_admin_csrf_field() .
 706                 '<input type = "submit" value = "' . t('DEL_FILE_LINKS') . '" />' .
 707                 '</form>' .
 708                 '</td>';
 709                 echo '</tr>';
 710             }
 711         }
 712     }
 713     echo '</table></fieldset>';
 714 }
 715
 716 /**
 717  * Clean expired files.
 718  * @return number of cleaned files.
 719  */
 720 function jirafeau_admin_clean()
 721 {
 722     $count = 0;
 723     /* Get all links files. */
 724     $stack = array(VAR_LINKS);
 725     while (($d = array_shift($stack)) && $d != null) {
 726         $dir = scandir($d);
 727
 728         foreach ($dir as $node) {
 729             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 730                 preg_match('/\.tmp/i', "$node")) {
 731                 continue;
 732             }
 733
 734             if (is_dir($d . $node)) {
 735                 /* Push new found directory. */
 736                 $stack[] = $d . $node . '/';
 737             } elseif (is_file($d . $node)) {
 738                 /* Read link informations. */
 739                 $l = jirafeau_get_link(basename($node));
 740                 if (!count($l)) {
 741                     continue;
 742                 }
 743                 $p = s2p($l['hash']);
 744                 if ($l['time'] > 0 && $l['time'] < time() || // expired
 745                     !file_exists(VAR_FILES . $p . $l['hash']) || // invalid
 746                     !file_exists(VAR_FILES . $p . $l['hash'] . '_count')) { // invalid
 747                     jirafeau_delete_link($node);
 748                     $count++;
 749                 }
 750             }
 751         }
 752     }
 753     return $count;
 754 }
 755
 756
 757 /**
 758  * Clean old async transferts.
 759  * @return number of cleaned files.
 760  */
 761 function jirafeau_admin_clean_async()
 762 {
 763     $count = 0;
 764     /* Get all links files. */
 765     $stack = array(VAR_ASYNC);
 766     while (($d = array_shift($stack)) && $d != null) {
 767         $dir = scandir($d);
 768
 769         foreach ($dir as $node) {
 770             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 771                 preg_match('/\.tmp/i', "$node")) {
 772                 continue;
 773             }
 774
 775             if (is_dir($d . $node)) {
 776                 /* Push new found directory. */
 777                 $stack[] = $d . $node . '/';
 778             } elseif (is_file($d . $node)) {
 779                 /* Read async informations. */
 780                 $a = jirafeau_get_async_ref(basename($node));
 781                 if (!count($a)) {
 782                     continue;
 783                 }
 784                 /* Delete transferts older than 1 hour. */
 785                 if (time() - $a['last_edited'] > 3600) {
 786                     jirafeau_async_delete(basename($node));
 787                     $count++;
 788                 }
 789             }
 790         }
 791     }
 792     return $count;
 793 }
 794 /**
 795  * Read async transfert informations
 796  * @return array containing informations.
 797  */
 798 function jirafeau_get_async_ref($ref)
 799 {
 800     $out = array();
 801     $refinfos = VAR_ASYNC . s2p("$ref") . "$ref";
 802
 803     if (!file_exists($refinfos)) {
 804         return $out;
 805     }
 806
 807     $c = file($refinfos);
 808     $out['file_name'] = trim($c[0]);
 809     $out['mime_type'] = trim($c[1]);
 810     $out['key'] = trim($c[2], NL);
 811     $out['time'] = trim($c[3]);
 812     $out['onetime'] = trim($c[4]);
 813     $out['ip'] = trim($c[5]);
 814     $out['last_edited'] = trim($c[6]);
 815     $out['next_code'] = trim($c[7]);
 816     return $out;
 817 }
 818
 819 /**
 820  * Delete async transfert informations
 821  */
 822 function jirafeau_async_delete($ref)
 823 {
 824     $p = s2p("$ref");
 825     if (file_exists(VAR_ASYNC . $p . $ref)) {
 826         unlink(VAR_ASYNC . $p . $ref);
 827     }
 828     if (file_exists(VAR_ASYNC . $p . $ref . '_data')) {
 829         unlink(VAR_ASYNC . $p . $ref . '_data');
 830     }
 831     $parse = VAR_ASYNC . $p;
 832     $scan = array();
 833     while (file_exists($parse)
 834            && ($scan = scandir($parse))
 835            && count($scan) == 2 // '.' and '..' folders => empty.
 836            && basename($parse) != basename(VAR_ASYNC)) {
 837         rmdir($parse);
 838         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 839     }
 840 }
 841
 842 /**
 843   * Init a new asynchronous upload.
 844   * @param $finename Name of the file to send
 845   * @param $one_time One time upload parameter
 846   * @param $key eventual password (or blank)
 847   * @param $time time limit
 848   * @param $ip ip address of the client
 849   * @return a string containing a temporary reference followed by a code or the string 'Error'
 850   */
 851 function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
 852 {
 853     $res = 'Error';
 854
 855     /* Create temporary folder. */
 856     $ref;
 857     $p;
 858     $code = jirafeau_gen_random(4);
 859     do {
 860         $ref = jirafeau_gen_random(32);
 861         $p = VAR_ASYNC . s2p($ref);
 862     } while (file_exists($p));
 863     @mkdir($p, 0755, true);
 864     if (!file_exists($p)) {
 865         echo 'Error';
 866         return;
 867     }
 868
 869     /* md5 password or empty */
 870     $password = '';
 871     if (!empty($key)) {
 872         $password = md5($key);
 873     }
 874
 875     /* Store informations. */
 876     $p .= $ref;
 877     $handle = fopen($p, 'w');
 878     fwrite($handle,
 879             str_replace(NL, '', trim($filename)) . NL .
 880             str_replace(NL, '', trim($type)) . NL . $password . NL .
 881             $time . NL . ($one_time ? 'O' : 'R') . NL . $ip . NL .
 882             time() . NL . $code . NL);
 883     fclose($handle);
 884
 885     return $ref . NL . $code ;
 886 }
 887
 888 /**
 889   * Append a piece of file on the asynchronous upload.
 890   * @param $ref asynchronous upload reference
 891   * @param $file piece of data
 892   * @param $code client code for this operation
 893   * @param $max_file_size maximum allowed file size
 894   * @return a string containing a next code to use or the string "Error"
 895   */
 896 function jirafeau_async_push($ref, $data, $code, $max_file_size)
 897 {
 898     /* Get async infos. */
 899     $a = jirafeau_get_async_ref($ref);
 900
 901     /* Check some errors. */
 902     if (count($a) == 0
 903         || $a['next_code'] != "$code"
 904         || empty($data['tmp_name'])
 905         || !is_uploaded_file($data['tmp_name'])) {
 906         return 'Error';
 907     }
 908
 909     $p = s2p($ref);
 910
 911     /* File path. */
 912     $r_path = $data['tmp_name'];
 913     $w_path = VAR_ASYNC . $p . $ref . '_data';
 914
 915     /* Check that file size is not above upload limit. */
 916     if ($max_file_size > 0 &&
 917         filesize($r_path) + filesize($w_path) > $max_file_size * 1024 * 1024) {
 918         jirafeau_async_delete($ref);
 919         return 'Error';
 920     }
 921
 922     /* Concatenate data. */
 923     $r = fopen($r_path, 'r');
 924     $w = fopen($w_path, 'a');
 925     while (!feof($r)) {
 926         if (fwrite($w, fread($r, 1024)) === false) {
 927             fclose($r);
 928             fclose($w);
 929             jirafeau_async_delete($ref);
 930             return 'Error';
 931         }
 932     }
 933     fclose($r);
 934     fclose($w);
 935     unlink($r_path);
 936
 937     /* Update async file. */
 938     $code = jirafeau_gen_random(4);
 939     $handle = fopen(VAR_ASYNC . $p . $ref, 'w');
 940     fwrite($handle,
 941             $a['file_name'] . NL. $a['mime_type'] . NL. $a['key'] . NL .
 942             $a['time'] . NL . $a['onetime'] . NL . $a['ip'] . NL .
 943             time() . NL . $code . NL);
 944     fclose($handle);
 945     return $code;
 946 }
 947
 948 /**
 949   * Finalyze an asynchronous upload.
 950   * @param $ref asynchronous upload reference
 951   * @param $code client code for this operation
 952   * @param $crypt boolean asking to crypt or not
 953   * @param $link_name_length link name length
 954   * @return a string containing the download reference followed by a delete code or the string 'Error'
 955   */
 956 function jirafeau_async_end($ref, $code, $crypt, $link_name_length, $file_hash_method)
 957 {
 958     /* Get async infos. */
 959     $a = jirafeau_get_async_ref($ref);
 960     if (count($a) == 0
 961         || $a['next_code'] != "$code") {
 962         return "Error";
 963     }
 964
 965     /* Generate link infos. */
 966     $p = VAR_ASYNC . s2p($ref) . $ref . "_data";
 967     if (!file_exists($p)) {
 968         return 'Error';
 969     }
 970
 971     $crypted = false;
 972     $crypt_key = '';
 973     if ($crypt == true && extension_loaded('mcrypt') == true) {
 974         $crypt_key = jirafeau_encrypt_file($p, $p);
 975         if (strlen($crypt_key) > 0) {
 976             $crypted = true;
 977         }
 978     }
 979
 980     $hash = jirafeau_hash_file($file_hash_method, $p);
 981     $size = filesize($p);
 982     $np = s2p($hash);
 983     $delete_link_code = jirafeau_gen_random(5);
 984
 985     /* File already exist ? */
 986     if (!file_exists(VAR_FILES . $np)) {
 987         @mkdir(VAR_FILES . $np, 0755, true);
 988     }
 989     if (!file_exists(VAR_FILES . $np . $hash)) {
 990         rename($p, VAR_FILES . $np . $hash);
 991     }
 992
 993     /* Increment or create count file. */
 994     $counter = 0;
 995     if (file_exists(VAR_FILES . $np . $hash . '_count')) {
 996         $content = file(VAR_FILES . $np . $hash. '_count');
 997         $counter = trim($content[0]);
 998     }
 999     $counter++;
1000     $handle = fopen(VAR_FILES . $np . $hash. '_count', 'w');
1001     fwrite($handle, $counter);
1002     fclose($handle);
1003
1004     /* Create link. */
1005     $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
1006     $handle = fopen($link_tmp_name, 'w');
1007     fwrite($handle,
1008             $a['file_name'] . NL . $a['mime_type'] . NL . $size . NL .
1009             $a['key'] . NL . $a['time'] . NL . $hash . NL . $a['onetime'] . NL .
1010             time() . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C' : 'O'));
1011     fclose($handle);
1012     $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
1013     $l = s2p("$hash_link");
1014     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
1015         !rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
1016         echo "Error";
1017     }
1018
1019     /* Clean async upload. */
1020     jirafeau_async_delete($ref);
1021     return $hash_link . NL . $delete_link_code . NL . urlencode($crypt_key);
1022 }
1023
1024 function jirafeau_crypt_create_iv($base, $size)
1025 {
1026     $iv = '';
1027     while (strlen($iv) < $size) {
1028         $iv = $iv . $base;
1029     }
1030     $iv = substr($iv, 0, $size);
1031     return $iv;
1032 }
1033
1034 /**
1035  * Crypt file and returns decrypt key.
1036  * @param $fp_src file path to the file to crypt.
1037  * @param $fp_dst file path to the file to write crypted file (could be the same).
1038  * @return decrypt key composed of the key and the iv separated by a point ('.')
1039  */
1040 function jirafeau_encrypt_file($fp_src, $fp_dst)
1041 {
1042     $fs = filesize($fp_src);
1043     if ($fs === false || $fs == 0 || !(extension_loaded('mcrypt') == true)) {
1044         return '';
1045     }
1046
1047     /* Prepare module. */
1048     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1049     /* Generate key. */
1050     $crypt_key = jirafeau_gen_random(10);
1051     $hash_key = md5($crypt_key);
1052     $iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
1053     /* Init module. */
1054     mcrypt_generic_init($m, $hash_key, $iv);
1055     /* Crypt file. */
1056     $r = fopen($fp_src, 'r');
1057     $w = fopen($fp_dst, 'c');
1058     while (!feof($r)) {
1059         $enc = mcrypt_generic($m, fread($r, 1024));
1060         if (fwrite($w, $enc) === false) {
1061             return '';
1062         }
1063     }
1064     fclose($r);
1065     fclose($w);
1066     /* Cleanup. */
1067     mcrypt_generic_deinit($m);
1068     mcrypt_module_close($m);
1069     return $crypt_key;
1070 }
1071
1072 /**
1073  * Decrypt file.
1074  * @param $fp_src file path to the file to decrypt.
1075  * @param $fp_dst file path to the file to write decrypted file (could be the same).
1076  * @param $k string composed of the key and the iv separated by a point ('.')
1077  * @return key used to decrypt. a string of length 0 is returned if failed.
1078  */
1079 function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
1080 {
1081     $fs = filesize($fp_src);
1082     if ($fs === false || $fs == 0 || extension_loaded('mcrypt') == false) {
1083         return false;
1084     }
1085
1086     /* Init module */
1087     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1088     /* Extract key and iv. */
1089     $crypt_key = $k;
1090     $hash_key = md5($crypt_key);
1091     $iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
1092     /* Decrypt file. */
1093     $r = fopen($fp_src, 'r');
1094     $w = fopen($fp_dst, 'c');
1095     while (!feof($r)) {
1096         $dec = mdecrypt_generic($m, fread($r, 1024));
1097         if (fwrite($w, $dec) === false) {
1098             return false;
1099         }
1100     }
1101     fclose($r);
1102     fclose($w);
1103     /* Cleanup. */
1104     mcrypt_generic_deinit($m);
1105     mcrypt_module_close($m);
1106     return true;
1107 }
1108
1109 /**
1110  * Check if Jirafeau is password protected for visitors.
1111  * @return true if Jirafeau is password protected, false otherwise.
1112  */
1113 function jirafeau_has_upload_password($cfg)
1114 {
1115     return count($cfg['upload_password']) > 0;
1116 }
1117
1118 /**
1119  * Challenge password for a visitor.
1120  * @param $password password to be challenged
1121  * @return true if password is valid, false otherwise.
1122  */
1123 function jirafeau_challenge_upload_password($cfg, $password)
1124 {
1125     if (!jirafeau_has_upload_password($cfg)) {
1126         return false;
1127     }
1128     foreach ($cfg['upload_password'] as $p) {
1129         if ($password == $p) {
1130             return true;
1131         }
1132     }
1133     return false;
1134 }
1135
1136 /**
1137  * Test if the given IP is whitelisted by the given list.
1138  *
1139  * @param $allowedIpList array of allowed IPs
1140  * @param $challengedIp IP to be challenged
1141  * @return true if IP is authorized, false otherwise.
1142  */
1143 function jirafeau_challenge_ip($allowedIpList, $challengedIp)
1144 {
1145     foreach ($allowedIpList as $i) {
1146         if ($i == $challengedIp) {
1147             return true;
1148         }
1149         // CIDR test for IPv4 only.
1150         if (strpos($i, '/') !== false) {
1151             list($subnet, $mask) = explode('/', $i);
1152             if ((ip2long($challengedIp) & ~((1 << (32 - $mask)) - 1)) == ip2long($subnet)) {
1153                 return true;
1154             }
1155         }
1156     }
1157     return false;
1158 }
1159
1160 /**
1161  * Check if Jirafeau has a restriction on the IP address for uploading.
1162  * @return true if uploading is IP restricted, false otherwise.
1163  */
1164 function jirafeau_upload_has_ip_restriction($cfg) {
1165     return count($cfg['upload_ip']) > 0;
1166 }
1167
1168 /**
1169  * Test if visitor's IP is authorized to upload at all.
1170  *
1171  * @param $cfg configuration
1172  * @param $challengedIp IP to be challenged
1173  * @return true if IP is authorized, false otherwise.
1174  */
1175 function jirafeau_challenge_upload_ip($cfg, $challengedIp)
1176 {
1177     // If no IP address have been listed, allow upload from any IP
1178     if (!jirafeau_upload_has_ip_restriction($cfg)) {
1179         return true;
1180     }
1181     return jirafeau_challenge_ip($cfg['upload_ip'], $challengedIp);
1182 }
1183
1184 /**
1185  * Test if visitor's IP is authorized to upload without a password.
1186  *
1187  * @param $cfg configuration
1188  * @param $challengedIp IP to be challenged
1189  * @return true if IP is authorized, false otherwise.
1190  */
1191 function jirafeau_challenge_upload_ip_without_password($cfg, $challengedIp)
1192 {
1193     return jirafeau_challenge_ip($cfg['upload_ip_nopassword'], $challengedIp);
1194 }
1195
1196 /**
1197  * Test if visitor's IP is authorized or password is supplied and authorized
1198  * @param $ip IP to be challenged
1199  * @param $password password to be challenged
1200  * @return true if access is valid, false otherwise.
1201  */
1202 function jirafeau_challenge_upload ($cfg, $ip, $password)
1203 {
1204     return jirafeau_challenge_upload_ip_without_password($cfg, $ip) ||
1205             (!jirafeau_has_upload_password($cfg) && !jirafeau_upload_has_ip_restriction($cfg)) ||
1206             (jirafeau_challenge_upload_password($cfg, $password) && jirafeau_challenge_upload_ip($cfg, $ip));
1207 }
1208
1209 /** Tell if we have some HTTP headers generated by a proxy */
1210 function has_http_forwarded()
1211 {
1212     return
1213         !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ||
1214         !empty($_SERVER['http_X_forwarded_for']);
1215 }
1216
1217 /**
1218  * Generate IP list from HTTP headers generated by a proxy
1219  * @return  array of IP strings
1220  */
1221 function get_ip_list_http_forwarded()
1222 {
1223     $ip_list = array();
1224     if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
1225         $l = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
1226         if ($l === false) {
1227             return array();
1228         }
1229         foreach ($l as $ip) {
1230             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1231         }
1232     }
1233     if (!empty($_SERVER['http_X_forwarded_for'])) {
1234         $l = explode(',', $_SERVER['http_X_forwarded_for']);
1235         foreach ($l as $ip) {
1236             // Separate IP from port
1237             $ipa = explode(':', $ip);
1238             if ($ipa === false) {
1239                 continue;
1240             }
1241             $ip = $ipa[0];
1242             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1243         }
1244     }
1245     return $ip_list;
1246 }
1247
1248 /**
1249  * Get the ip address of the client from REMOTE_ADDR
1250  * or from HTTP_X_FORWARDED_FOR if behind a proxy
1251  * @returns the client ip address
1252  */
1253 function get_ip_address($cfg)
1254 {
1255     $remote = $_SERVER['REMOTE_ADDR'];
1256     if (count($cfg['proxy_ip']) == 0 || !has_http_forwarded()) {
1257         return $remote;
1258     }
1259
1260     $ip_list = get_ip_list_http_forwarded();
1261     if (count($ip_list) == 0) {
1262         return $remote;
1263     }
1264
1265     foreach ($cfg['proxy_ip'] as $proxy_ip) {
1266         if ($remote != $proxy_ip) {
1267             continue;
1268         }
1269         // Take the last IP (the one which has been set by the defined proxy).
1270         return end($ip_list);
1271     }
1272     return $remote;
1273 }
1274
1275 /**
1276  * Convert hexadecimal string to base64
1277  */
1278 function hex_to_base64($hex)
1279 {
1280     $b = '';
1281     foreach (str_split($hex, 2) as $pair) {
1282         $b .= chr(hexdec($pair));
1283     }
1284     return base64_encode($b);
1285 }
1286
1287 /**
1288  * Replace markers in templates.
1289  *
1290  * Available markers have the scheme "###MARKERNAME###".
1291  *
1292  * @param $content string Template text with markers
1293  * @param $htmllinebreaks boolean Convert linebreaks to BR-Tags
1294  * @return Template with replaced markers
1295  */
1296 function jirafeau_replace_markers($content, $htmllinebreaks = false)
1297 {
1298     $patterns = array(
1299         '/###ORGANISATION###/',
1300         '/###CONTACTPERSON###/',
1301         '/###WEBROOT###/'
1302     );
1303     $replacements = array(
1304         $GLOBALS['cfg']['organisation'],
1305         $GLOBALS['cfg']['contactperson'],
1306         $GLOBALS['cfg']['web_root']
1307     );
1308     $content = preg_replace($patterns, $replacements, $content);
1309
1310     if (true === $htmllinebreaks) {
1311         $content = nl2br($content);
1312     }
1313
1314     return $content;
1315 }
1316
1317 function jirafeau_escape($string)
1318 {
1319     return htmlspecialchars($string, ENT_QUOTES);
1320 }
1321
1322 function jirafeau_admin_session_start()
1323 {
1324     $_SESSION['admin_auth'] = true;
1325     $_SESSION['admin_csrf'] = md5(uniqid(mt_rand(), true));
1326 }
1327
1328 function jirafeau_admin_session_end()
1329 {
1330     $_SESSION = array();
1331     session_destroy();
1332 }
1333
1334 function jirafeau_admin_session_logged()
1335 {
1336     return isset($_SESSION['admin_auth']) &&
1337            isset($_SESSION['admin_csrf']) &&
1338            isset($_POST['admin_csrf']) &&
1339            $_SESSION['admin_auth'] === true &&
1340            $_SESSION['admin_csrf'] === $_POST['admin_csrf'];
1341 }
1342
1343 function jirafeau_admin_csrf_field()
1344 {
1345     return "<input type='hidden' name='admin_csrf' value='". $_SESSION['admin_csrf'] . "'/>";
1346 }
1347
1348 function jirafeau_dir_size($dir)
1349 {
1350     $size = 0;
1351     foreach (glob(rtrim($dir, '/').'/*', GLOB_NOSORT) as $entry) {
1352         $size += is_file($entry) ? filesize($entry) : jirafeau_dir_size($entry);
1353     }
1354     return $size;
1355 }