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