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($md5)
 163 {
 164     $p = s2p("$md5");
 165     $f = VAR_FILES . $p . $md5;
 166     if (file_exists($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     $md5 = $l['md5'];
 265     $p = s2p("$md5");
 266
 267     $counter = 1;
 268     if (file_exists(VAR_FILES . $p . $md5. '_count')) {
 269         $content = file(VAR_FILES . $p . $md5. '_count');
 270         $counter = trim($content[0]);
 271     }
 272     $counter--;
 273
 274     if ($counter >= 1) {
 275         $handle = fopen(VAR_FILES . $p . $md5. '_count', 'w');
 276         fwrite($handle, $counter);
 277         fclose($handle);
 278     }
 279
 280     if ($counter == 0) {
 281         jirafeau_clean_rm_file($md5);
 282     }
 283 }
 284
 285 /**
 286  * Delete a file and it's links.
 287  */
 288 function jirafeau_delete_file($md5)
 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['md5'] == $md5) {
 312                     $count++;
 313                     jirafeau_delete_link($node);
 314                 }
 315             }
 316         }
 317     }
 318     jirafeau_clean_rm_file($md5);
 319     return $count;
 320 }
 321
 322 /**
 323  * handles an uploaded file
 324  * @param $file the file struct given by $_FILE[]
 325  * @param $one_time_download is the file a one time download ?
 326  * @param $key if not empty, protect the file with this key
 327  * @param $time the time of validity of the file
 328  * @param $ip uploader's ip
 329  * @param $crypt boolean asking to crypt or not
 330  * @param $link_name_length size of the link name
 331  * @returns an array containing some information
 332  *   'error' => information on possible errors
 333  *   'link' => the link name of the uploaded file
 334  *   'delete_link' => the link code to delete file
 335  */
 336 function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $link_name_length)
 337 {
 338     if (empty($file['tmp_name']) || !is_uploaded_file($file['tmp_name'])) {
 339         return (array(
 340                  'error' =>
 341                    array('has_error' => true,
 342                           'why' => jirafeau_upload_errstr($file['error'])),
 343                  'link' => '',
 344                  'delete_link' => ''));
 345     }
 346
 347     /* array representing no error */
 348     $noerr = array('has_error' => false, 'why' => '');
 349
 350     /* Crypt file if option is enabled. */
 351     $crypted = false;
 352     $crypt_key = '';
 353     if ($crypt == true && !(extension_loaded('mcrypt') == true)) {
 354         error_log("PHP extension mcrypt not loaded, won't encrypt in Jirafeau");
 355     }
 356     if ($crypt == true && extension_loaded('mcrypt') == true) {
 357         $crypt_key = jirafeau_encrypt_file($file['tmp_name'], $file['tmp_name']);
 358         if (strlen($crypt_key) > 0) {
 359             $crypted = true;
 360         }
 361     }
 362
 363     /* file informations */
 364     $md5 = md5_file($file['tmp_name']);
 365     $name = str_replace(NL, '', trim($file['name']));
 366     $mime_type = $file['type'];
 367     $size = $file['size'];
 368
 369     /* does file already exist ? */
 370     $rc = false;
 371     $p = s2p("$md5");
 372     if (file_exists(VAR_FILES . $p .  $md5)) {
 373         $rc = unlink($file['tmp_name']);
 374     } elseif ((file_exists(VAR_FILES . $p) || @mkdir(VAR_FILES . $p, 0755, true))
 375             && move_uploaded_file($file['tmp_name'], VAR_FILES . $p . $md5)) {
 376         $rc = true;
 377     }
 378     if (!$rc) {
 379         return (array(
 380                  'error' =>
 381                    array('has_error' => true,
 382                           'why' => t('INTERNAL_ERROR_DEL')),
 383                  'link' =>'',
 384                  'delete_link' => ''));
 385     }
 386
 387     /* Increment or create count file. */
 388     $counter = 0;
 389     if (file_exists(VAR_FILES . $p . $md5 . '_count')) {
 390         $content = file(VAR_FILES . $p . $md5. '_count');
 391         $counter = trim($content[0]);
 392     }
 393     $counter++;
 394     $handle = fopen(VAR_FILES . $p . $md5. '_count', 'w');
 395     fwrite($handle, $counter);
 396     fclose($handle);
 397
 398     /* Create delete code. */
 399     $delete_link_code = jirafeau_gen_random(5);
 400
 401     /* md5 password or empty. */
 402     $password = '';
 403     if (!empty($key)) {
 404         $password = md5($key);
 405     }
 406
 407     /* create link file */
 408     $link_tmp_name =  VAR_LINKS . $md5 . rand(0, 10000) . '.tmp';
 409     $handle = fopen($link_tmp_name, 'w');
 410     fwrite($handle,
 411             $name . NL. $mime_type . NL. $size . NL. $password . NL. $time .
 412             NL . $md5. NL . ($one_time_download ? 'O' : 'R') . NL . time() .
 413             NL . $ip . NL. $delete_link_code . NL . ($crypted ? 'C' : 'O'));
 414     fclose($handle);
 415     $md5_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 416     $l = s2p("$md5_link");
 417     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 418         !rename($link_tmp_name, VAR_LINKS . $l . $md5_link)) {
 419         if (file_exists($link_tmp_name)) {
 420             unlink($link_tmp_name);
 421         }
 422
 423         $counter--;
 424         if ($counter >= 1) {
 425             $handle = fopen(VAR_FILES . $p . $md5. '_count', 'w');
 426             fwrite($handle, $counter);
 427             fclose($handle);
 428         } else {
 429             jirafeau_clean_rm_file($md5_link);
 430         }
 431         return array(
 432                  'error' =>
 433                    array('has_error' => true,
 434                           'why' => t('Internal error during file creation. ')),
 435                  'link' =>'',
 436                  'delete_link' => '');
 437     }
 438     return array( 'error' => $noerr,
 439                   'link' => $md5_link,
 440                   'delete_link' => $delete_link_code,
 441                   'crypt_key' => $crypt_key);
 442 }
 443
 444 /**
 445  * Tells if a mime-type is viewable in a browser
 446  * @param $mime the mime type
 447  * @returns a boolean telling if a mime type is viewable
 448  */
 449 function jirafeau_is_viewable($mime)
 450 {
 451     if (!empty($mime)) {
 452         /* Actually, verify if mime-type is an image or a text. */
 453         $viewable = array('image', 'text', 'video', 'audio');
 454         $decomposed = explode('/', $mime);
 455         return in_array($decomposed[0], $viewable);
 456     }
 457     return false;
 458 }
 459
 460 // Error handling functions.
 461 //! Global array that contains all registered errors.
 462 $error_list = array();
 463
 464 /**
 465  * Adds an error to the list of errors.
 466  * @param $title the error's title
 467  * @param $description is a human-friendly description of the problem.
 468  */
 469 function add_error($title, $description)
 470 {
 471     global $error_list;
 472     $error_list[] = '<p>' . $title. '<br />' . $description. '</p>';
 473 }
 474
 475 /**
 476  * Informs whether any error has been registered yet.
 477  * @return true if there are errors.
 478  */
 479 function has_error()
 480 {
 481     global $error_list;
 482     return !empty($error_list);
 483 }
 484
 485 /**
 486  * Displays all the errors.
 487  */
 488 function show_errors()
 489 {
 490     if (has_error()) {
 491         global $error_list;
 492         echo '<div class="error">';
 493         foreach ($error_list as $error) {
 494             echo $error;
 495         }
 496         echo '</div>';
 497     }
 498 }
 499
 500 function check_errors($cfg)
 501 {
 502     if (file_exists(JIRAFEAU_ROOT . 'install.php')
 503         && !($cfg['installation_done'] === true)) {
 504         header('Location: install.php');
 505         exit;
 506     }
 507
 508     /* Checking for errors. */
 509     if (!is_writable(VAR_FILES)) {
 510         add_error(t('FILE_DIR_W'), VAR_FILES);
 511     }
 512
 513     if (!is_writable(VAR_LINKS)) {
 514         add_error(t('LINK_DIR_W'), VAR_LINKS);
 515     }
 516
 517     if (!is_writable(VAR_ASYNC)) {
 518         add_error(t('ASYNC_DIR_W'), VAR_ASYNC);
 519     }
 520 }
 521
 522 /**
 523  * Read link informations
 524  * @return array containing informations.
 525  */
 526 function jirafeau_get_link($hash)
 527 {
 528     $out = array();
 529     $link = VAR_LINKS . s2p("$hash") . $hash;
 530
 531     if (!file_exists($link)) {
 532         return $out;
 533     }
 534
 535     $c = file($link);
 536     $out['file_name'] = trim($c[0]);
 537     $out['mime_type'] = trim($c[1]);
 538     $out['file_size'] = trim($c[2]);
 539     $out['key'] = trim($c[3], NL);
 540     $out['time'] = trim($c[4]);
 541     $out['md5'] = trim($c[5]);
 542     $out['onetime'] = trim($c[6]);
 543     $out['upload_date'] = trim($c[7]);
 544     $out['ip'] = trim($c[8]);
 545     $out['link_code'] = trim($c[9]);
 546     $out['crypted'] = trim($c[10]) == 'C';
 547
 548     return $out;
 549 }
 550
 551 /**
 552  * List files in admin interface.
 553  */
 554 function jirafeau_admin_list($name, $file_hash, $link_hash)
 555 {
 556     echo '<fieldset><legend>';
 557     if (!empty($name)) {
 558         echo t('FILENAME') . ": " . jirafeau_escape($name);
 559     }
 560     if (!empty($file_hash)) {
 561         echo t('FILE') . ": " . jirafeau_escape($file_hash);
 562     }
 563     if (!empty($link_hash)) {
 564         echo t('LINK') . ": " . jirafeau_escape($link_hash);
 565     }
 566     if (empty($name) && empty($file_hash) && empty($link_hash)) {
 567         echo t('LS_FILES');
 568     }
 569     echo '</legend>';
 570     echo '<table>';
 571     echo '<tr>';
 572     echo '<td>' . t('FILENAME') . '</td>';
 573     echo '<td>' . t('TYPE') . '</td>';
 574     echo '<td>' . t('SIZE') . '</td>';
 575     echo '<td>' . t('EXPIRE') . '</td>';
 576     echo '<td>' . t('ONETIME') . '</td>';
 577     echo '<td>' . t('UPLOAD_DATE') . '</td>';
 578     echo '<td>' . t('ORIGIN') . '</td>';
 579     echo '<td>' . t('ACTION') . '</td>';
 580     echo '</tr>';
 581
 582     /* Get all links files. */
 583     $stack = array(VAR_LINKS);
 584     while (($d = array_shift($stack)) && $d != null) {
 585         $dir = scandir($d);
 586         foreach ($dir as $node) {
 587             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 588                 preg_match('/\.tmp/i', "$node")) {
 589                 continue;
 590             }
 591             if (is_dir($d . $node)) {
 592                 /* Push new found directory. */
 593                 $stack[] = $d . $node . '/';
 594             } elseif (is_file($d . $node)) {
 595                 /* Read link informations. */
 596                 $l = jirafeau_get_link($node);
 597                 if (!count($l)) {
 598                     continue;
 599                 }
 600
 601                 /* Filter. */
 602                 if (!empty($name) && !@preg_match("/$name/i", jirafeau_escape($l['file_name']))) {
 603                     continue;
 604                 }
 605                 if (!empty($file_hash) && $file_hash != $l['md5']) {
 606                     continue;
 607                 }
 608                 if (!empty($link_hash) && $link_hash != $node) {
 609                     continue;
 610                 }
 611                 /* Print link informations. */
 612                 echo '<tr>';
 613                 echo '<td>' .
 614                 '<strong><a id="upload_link" href="f.php?h='. jirafeau_escape($node) .'" title="' .
 615                     t('DL_PAGE') . '">' . jirafeau_escape($l['file_name']) . '</a></strong>';
 616                 echo '</td>';
 617                 echo '<td>' . jirafeau_escape($l['mime_type']) . '</td>';
 618                 echo '<td>' . jirafeau_human_size($l['file_size']) . '</td>';
 619                 echo '<td>' . ($l['time'] == -1 ? '∞' : jirafeau_get_datetimefield($l['time'])) . '</td>';
 620                 echo '<td>';
 621                 if ($l['onetime'] == 'O') {
 622                     echo 'Y';
 623                 } else {
 624                     echo 'N';
 625                 }
 626                 echo '</td>';
 627                 echo '<td>' . jirafeau_get_datetimefield($l['upload_date']) . '</td>';
 628                 echo '<td>' . $l['ip'] . '</td>';
 629                 echo '<td>' .
 630                 '<form method="post">' .
 631                 '<input type = "hidden" name = "action" value = "download"/>' .
 632                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 633                 jirafeau_admin_csrf_field() .
 634                 '<input type = "submit" value = "' . t('DL') . '" />' .
 635                 '</form>' .
 636                 '<form method="post">' .
 637                 '<input type = "hidden" name = "action" value = "delete_link"/>' .
 638                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 639                 jirafeau_admin_csrf_field() .
 640                 '<input type = "submit" value = "' . t('DEL_LINK') . '" />' .
 641                 '</form>' .
 642                 '<form method="post">' .
 643                 '<input type = "hidden" name = "action" value = "delete_file"/>' .
 644                 '<input type = "hidden" name = "md5" value = "' . $l['md5'] . '"/>' .
 645                 jirafeau_admin_csrf_field() .
 646                 '<input type = "submit" value = "' . t('DEL_FILE_LINKS') . '" />' .
 647                 '</form>' .
 648                 '</td>';
 649                 echo '</tr>';
 650             }
 651         }
 652     }
 653     echo '</table></fieldset>';
 654 }
 655
 656 /**
 657  * Clean expired files.
 658  * @return number of cleaned files.
 659  */
 660 function jirafeau_admin_clean()
 661 {
 662     $count = 0;
 663     /* Get all links files. */
 664     $stack = array(VAR_LINKS);
 665     while (($d = array_shift($stack)) && $d != null) {
 666         $dir = scandir($d);
 667
 668         foreach ($dir as $node) {
 669             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 670                 preg_match('/\.tmp/i', "$node")) {
 671                 continue;
 672             }
 673
 674             if (is_dir($d . $node)) {
 675                 /* Push new found directory. */
 676                 $stack[] = $d . $node . '/';
 677             } elseif (is_file($d . $node)) {
 678                 /* Read link informations. */
 679                 $l = jirafeau_get_link(basename($node));
 680                 if (!count($l)) {
 681                     continue;
 682                 }
 683                 $p = s2p($l['md5']);
 684                 if ($l['time'] > 0 && $l['time'] < time() || // expired
 685                     !file_exists(VAR_FILES . $p . $l['md5']) || // invalid
 686                     !file_exists(VAR_FILES . $p . $l['md5'] . '_count')) { // invalid
 687                     jirafeau_delete_link($node);
 688                     $count++;
 689                 }
 690             }
 691         }
 692     }
 693     return $count;
 694 }
 695
 696
 697 /**
 698  * Clean old async transferts.
 699  * @return number of cleaned files.
 700  */
 701 function jirafeau_admin_clean_async()
 702 {
 703     $count = 0;
 704     /* Get all links files. */
 705     $stack = array(VAR_ASYNC);
 706     while (($d = array_shift($stack)) && $d != null) {
 707         $dir = scandir($d);
 708
 709         foreach ($dir as $node) {
 710             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 711                 preg_match('/\.tmp/i', "$node")) {
 712                 continue;
 713             }
 714
 715             if (is_dir($d . $node)) {
 716                 /* Push new found directory. */
 717                 $stack[] = $d . $node . '/';
 718             } elseif (is_file($d . $node)) {
 719                 /* Read async informations. */
 720                 $a = jirafeau_get_async_ref(basename($node));
 721                 if (!count($a)) {
 722                     continue;
 723                 }
 724                 /* Delete transferts older than 1 hour. */
 725                 if (time() - $a['last_edited'] > 3600) {
 726                     jirafeau_async_delete(basename($node));
 727                     $count++;
 728                 }
 729             }
 730         }
 731     }
 732     return $count;
 733 }
 734 /**
 735  * Read async transfert informations
 736  * @return array containing informations.
 737  */
 738 function jirafeau_get_async_ref($ref)
 739 {
 740     $out = array();
 741     $refinfos = VAR_ASYNC . s2p("$ref") . "$ref";
 742
 743     if (!file_exists($refinfos)) {
 744         return $out;
 745     }
 746
 747     $c = file($refinfos);
 748     $out['file_name'] = trim($c[0]);
 749     $out['mime_type'] = trim($c[1]);
 750     $out['key'] = trim($c[2], NL);
 751     $out['time'] = trim($c[3]);
 752     $out['onetime'] = trim($c[4]);
 753     $out['ip'] = trim($c[5]);
 754     $out['last_edited'] = trim($c[6]);
 755     $out['next_code'] = trim($c[7]);
 756     return $out;
 757 }
 758
 759 /**
 760  * Delete async transfert informations
 761  */
 762 function jirafeau_async_delete($ref)
 763 {
 764     $p = s2p("$ref");
 765     if (file_exists(VAR_ASYNC . $p . $ref)) {
 766         unlink(VAR_ASYNC . $p . $ref);
 767     }
 768     if (file_exists(VAR_ASYNC . $p . $ref . '_data')) {
 769         unlink(VAR_ASYNC . $p . $ref . '_data');
 770     }
 771     $parse = VAR_ASYNC . $p;
 772     $scan = array();
 773     while (file_exists($parse)
 774            && ($scan = scandir($parse))
 775            && count($scan) == 2 // '.' and '..' folders => empty.
 776            && basename($parse) != basename(VAR_ASYNC)) {
 777         rmdir($parse);
 778         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 779     }
 780 }
 781
 782 /**
 783   * Init a new asynchronous upload.
 784   * @param $finename Name of the file to send
 785   * @param $one_time One time upload parameter
 786   * @param $key eventual password (or blank)
 787   * @param $time time limit
 788   * @param $ip ip address of the client
 789   * @return a string containing a temporary reference followed by a code or the string 'Error'
 790   */
 791 function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
 792 {
 793     $res = 'Error';
 794
 795     /* Create temporary folder. */
 796     $ref;
 797     $p;
 798     $code = jirafeau_gen_random(4);
 799     do {
 800         $ref = jirafeau_gen_random(32);
 801         $p = VAR_ASYNC . s2p($ref);
 802     } while (file_exists($p));
 803     @mkdir($p, 0755, true);
 804     if (!file_exists($p)) {
 805         echo 'Error';
 806         return;
 807     }
 808
 809     /* md5 password or empty */
 810     $password = '';
 811     if (!empty($key)) {
 812         $password = md5($key);
 813     }
 814
 815     /* Store informations. */
 816     $p .= $ref;
 817     $handle = fopen($p, 'w');
 818     fwrite($handle,
 819             str_replace(NL, '', trim($filename)) . NL .
 820             str_replace(NL, '', trim($type)) . NL . $password . NL .
 821             $time . NL . ($one_time ? 'O' : 'R') . NL . $ip . NL .
 822             time() . NL . $code . NL);
 823     fclose($handle);
 824
 825     return $ref . NL . $code ;
 826 }
 827
 828 /**
 829   * Append a piece of file on the asynchronous upload.
 830   * @param $ref asynchronous upload reference
 831   * @param $file piece of data
 832   * @param $code client code for this operation
 833   * @param $max_file_size maximum allowed file size
 834   * @return a string containing a next code to use or the string "Error"
 835   */
 836 function jirafeau_async_push($ref, $data, $code, $max_file_size)
 837 {
 838     /* Get async infos. */
 839     $a = jirafeau_get_async_ref($ref);
 840
 841     /* Check some errors. */
 842     if (count($a) == 0
 843         || $a['next_code'] != "$code"
 844         || empty($data['tmp_name'])
 845         || !is_uploaded_file($data['tmp_name'])) {
 846         return 'Error';
 847     }
 848
 849     $p = s2p($ref);
 850
 851     /* File path. */
 852     $r_path = $data['tmp_name'];
 853     $w_path = VAR_ASYNC . $p . $ref . '_data';
 854
 855     /* Check that file size is not above upload limit. */
 856     if ($max_file_size > 0 &&
 857         filesize($r_path) + filesize($w_path) > $max_file_size * 1024 * 1024) {
 858         jirafeau_async_delete($ref);
 859         return 'Error';
 860     }
 861
 862     /* Concatenate data. */
 863     $r = fopen($r_path, 'r');
 864     $w = fopen($w_path, 'a');
 865     while (!feof($r)) {
 866         if (fwrite($w, fread($r, 1024)) === false) {
 867             fclose($r);
 868             fclose($w);
 869             jirafeau_async_delete($ref);
 870             return 'Error';
 871         }
 872     }
 873     fclose($r);
 874     fclose($w);
 875     unlink($r_path);
 876
 877     /* Update async file. */
 878     $code = jirafeau_gen_random(4);
 879     $handle = fopen(VAR_ASYNC . $p . $ref, 'w');
 880     fwrite($handle,
 881             $a['file_name'] . NL. $a['mime_type'] . NL. $a['key'] . NL .
 882             $a['time'] . NL . $a['onetime'] . NL . $a['ip'] . NL .
 883             time() . NL . $code . NL);
 884     fclose($handle);
 885     return $code;
 886 }
 887
 888 /**
 889   * Finalyze an asynchronous upload.
 890   * @param $ref asynchronous upload reference
 891   * @param $code client code for this operation
 892   * @param $crypt boolean asking to crypt or not
 893   * @param $link_name_length link name length
 894   * @return a string containing the download reference followed by a delete code or the string 'Error'
 895   */
 896 function jirafeau_async_end($ref, $code, $crypt, $link_name_length)
 897 {
 898     /* Get async infos. */
 899     $a = jirafeau_get_async_ref($ref);
 900     if (count($a) == 0
 901         || $a['next_code'] != "$code") {
 902         return "Error";
 903     }
 904
 905     /* Generate link infos. */
 906     $p = VAR_ASYNC . s2p($ref) . $ref . "_data";
 907     if (!file_exists($p)) {
 908         return 'Error';
 909     }
 910
 911     $crypted = false;
 912     $crypt_key = '';
 913     if ($crypt == true && extension_loaded('mcrypt') == true) {
 914         $crypt_key = jirafeau_encrypt_file($p, $p);
 915         if (strlen($crypt_key) > 0) {
 916             $crypted = true;
 917         }
 918     }
 919
 920     $md5 = md5_file($p);
 921     $size = filesize($p);
 922     $np = s2p($md5);
 923     $delete_link_code = jirafeau_gen_random(5);
 924
 925     /* File already exist ? */
 926     if (!file_exists(VAR_FILES . $np)) {
 927         @mkdir(VAR_FILES . $np, 0755, true);
 928     }
 929     if (!file_exists(VAR_FILES . $np . $md5)) {
 930         rename($p, VAR_FILES . $np . $md5);
 931     }
 932
 933     /* Increment or create count file. */
 934     $counter = 0;
 935     if (file_exists(VAR_FILES . $np . $md5 . '_count')) {
 936         $content = file(VAR_FILES . $np . $md5. '_count');
 937         $counter = trim($content[0]);
 938     }
 939     $counter++;
 940     $handle = fopen(VAR_FILES . $np . $md5. '_count', 'w');
 941     fwrite($handle, $counter);
 942     fclose($handle);
 943
 944     /* Create link. */
 945     $link_tmp_name =  VAR_LINKS . $md5 . rand(0, 10000) . '.tmp';
 946     $handle = fopen($link_tmp_name, 'w');
 947     fwrite($handle,
 948             $a['file_name'] . NL . $a['mime_type'] . NL . $size . NL .
 949             $a['key'] . NL . $a['time'] . NL . $md5 . NL . $a['onetime'] . NL .
 950             time() . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C' : 'O'));
 951     fclose($handle);
 952     $md5_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 953     $l = s2p("$md5_link");
 954     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 955         !rename($link_tmp_name, VAR_LINKS . $l . $md5_link)) {
 956         echo "Error";
 957     }
 958
 959     /* Clean async upload. */
 960     jirafeau_async_delete($ref);
 961     return $md5_link . NL . $delete_link_code . NL . urlencode($crypt_key);
 962 }
 963
 964 function jirafeau_crypt_create_iv($base, $size)
 965 {
 966     $iv = '';
 967     while (strlen($iv) < $size) {
 968         $iv = $iv . $base;
 969     }
 970     $iv = substr($iv, 0, $size);
 971     return $iv;
 972 }
 973
 974 /**
 975  * Crypt file and returns decrypt key.
 976  * @param $fp_src file path to the file to crypt.
 977  * @param $fp_dst file path to the file to write crypted file (could be the same).
 978  * @return decrypt key composed of the key and the iv separated by a point ('.')
 979  */
 980 function jirafeau_encrypt_file($fp_src, $fp_dst)
 981 {
 982     $fs = filesize($fp_src);
 983     if ($fs === false || $fs == 0 || !(extension_loaded('mcrypt') == true)) {
 984         return '';
 985     }
 986
 987     /* Prepare module. */
 988     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
 989     /* Generate key. */
 990     $crypt_key = jirafeau_gen_random(10);
 991     $md5_key = md5($crypt_key);
 992     $iv = jirafeau_crypt_create_iv($md5_key, mcrypt_enc_get_iv_size($m));
 993     /* Init module. */
 994     mcrypt_generic_init($m, $md5_key, $iv);
 995     /* Crypt file. */
 996     $r = fopen($fp_src, 'r');
 997     $w = fopen($fp_dst, 'c');
 998     while (!feof($r)) {
 999         $enc = mcrypt_generic($m, fread($r, 1024));
1000         if (fwrite($w, $enc) === false) {
1001             return '';
1002         }
1003     }
1004     fclose($r);
1005     fclose($w);
1006     /* Cleanup. */
1007     mcrypt_generic_deinit($m);
1008     mcrypt_module_close($m);
1009     return $crypt_key;
1010 }
1011
1012 /**
1013  * Decrypt file.
1014  * @param $fp_src file path to the file to decrypt.
1015  * @param $fp_dst file path to the file to write decrypted file (could be the same).
1016  * @param $k string composed of the key and the iv separated by a point ('.')
1017  * @return key used to decrypt. a string of length 0 is returned if failed.
1018  */
1019 function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
1020 {
1021     $fs = filesize($fp_src);
1022     if ($fs === false || $fs == 0 || extension_loaded('mcrypt') == false) {
1023         return false;
1024     }
1025
1026     /* Init module */
1027     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1028     /* Extract key and iv. */
1029     $crypt_key = $k;
1030     $md5_key = md5($crypt_key);
1031     $iv = jirafeau_crypt_create_iv($md5_key, mcrypt_enc_get_iv_size($m));
1032     /* Decrypt file. */
1033     $r = fopen($fp_src, 'r');
1034     $w = fopen($fp_dst, 'c');
1035     while (!feof($r)) {
1036         $dec = mdecrypt_generic($m, fread($r, 1024));
1037         if (fwrite($w, $dec) === false) {
1038             return false;
1039         }
1040     }
1041     fclose($r);
1042     fclose($w);
1043     /* Cleanup. */
1044     mcrypt_generic_deinit($m);
1045     mcrypt_module_close($m);
1046     return true;
1047 }
1048
1049 /**
1050  * Check if Jirafeau is password protected for visitors.
1051  * @return true if Jirafeau is password protected, false otherwise.
1052  */
1053 function jirafeau_has_upload_password($cfg)
1054 {
1055     return count($cfg['upload_password']) > 0;
1056 }
1057
1058 /**
1059  * Challenge password for a visitor.
1060  * @param $password password to be challenged
1061  * @return true if password is valid, false otherwise.
1062  */
1063 function jirafeau_challenge_upload_password($cfg, $password)
1064 {
1065     if (!jirafeau_has_upload_password($cfg)) {
1066         return false;
1067     }
1068     foreach ($cfg['upload_password'] as $p) {
1069         if ($password == $p) {
1070             return true;
1071         }
1072     }
1073     return false;
1074 }
1075
1076 /**
1077  * Test if visitor's IP is authorized to upload.
1078  *
1079  * @param $allowedIpList array of allowed IPs
1080  * @param $challengedIp IP to be challenged
1081  * @return true if IP is authorized, false otherwise.
1082  */
1083 function jirafeau_challenge_upload_ip($allowedIpList, $challengedIp)
1084 {
1085     // skip if list is empty = all IPs allowed
1086     if (count($allowedIpList) == 0) {
1087         return true;
1088     }
1089     // test given IP against each allowed IP
1090     foreach ($allowedIpList as $i) {
1091         if ($i == $challengedIp) {
1092             return true;
1093         }
1094         // CIDR test for IPv4 only.
1095         if (strpos($i, '/') !== false) {
1096             list($subnet, $mask) = explode('/', $i);
1097             if ((ip2long($challengedIp) & ~((1 << (32 - $mask)) - 1)) == ip2long($subnet)) {
1098                 return true;
1099             }
1100         }
1101     }
1102     return false;
1103 }
1104
1105 /**
1106  * Test if visitor's IP is authorized or password is supplied and authorized
1107  * @param $ip IP to be challenged
1108  * @param $password password to be challenged
1109  * @return true if access is valid, false otherwise.
1110  */
1111 function jirafeau_challenge_upload ($cfg, $ip, $password)
1112 {
1113     // Allow if no ip restrictaion and no password restriction
1114     if ((count ($cfg['upload_ip']) == 0) and (count ($cfg['upload_password']) == 0)) {
1115         return true;
1116     }
1117
1118     // Allow if ip is in array (no password)
1119     foreach ($cfg['upload_ip_nopassword'] as $i) {
1120         if ($i == $ip) {
1121             return true;
1122         }
1123         // CIDR test for IPv4 only.
1124         if (strpos ($i, '/') !== false)
1125         {
1126             list ($subnet, $mask) = explode('/', $i);
1127             if ((ip2long ($ip) & ~((1 << (32 - $mask)) - 1) ) == ip2long ($subnet)) {
1128                 return true;
1129             }
1130         }
1131     }
1132
1133     // Allow if ip is in array
1134     foreach ($cfg['upload_ip'] as $i) {
1135         if ($i == $ip) {
1136             return true;
1137         }
1138         // CIDR test for IPv4 only.
1139         if (strpos ($i, '/') !== false)
1140         {
1141             list ($subnet, $mask) = explode('/', $i);
1142             if ((ip2long ($ip) & ~((1 << (32 - $mask)) - 1) ) == ip2long ($subnet)) {
1143                 return true;
1144             }
1145         }
1146     }
1147     if (!jirafeau_has_upload_password($cfg)) {
1148         return false;
1149     }
1150
1151     foreach ($cfg['upload_password'] as $p) {
1152         if ($password == $p) {
1153             return true;
1154         }
1155     }
1156     return false;
1157 }
1158
1159 /** Tell if we have some HTTP headers generated by a proxy */
1160 function has_http_forwarded()
1161 {
1162     return
1163         !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ||
1164         !empty($_SERVER['http_X_forwarded_for']);
1165 }
1166
1167 /**
1168  * Generate IP list from HTTP headers generated by a proxy
1169  * @return  array of IP strings
1170  */
1171 function get_ip_list_http_forwarded()
1172 {
1173     $ip_list = array();
1174     if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
1175         $l = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
1176         if ($l === false) {
1177             return array();
1178         }
1179         foreach ($l as $ip) {
1180             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1181         }
1182     }
1183     if (!empty($_SERVER['http_X_forwarded_for'])) {
1184         $l = explode(',', $_SERVER['http_X_forwarded_for']);
1185         foreach ($l as $ip) {
1186             // Separate IP from port
1187             $ipa = explode(':', $ip);
1188             if ($ipa === false) {
1189                 continue;
1190             }
1191             $ip = $ipa[0];
1192             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1193         }
1194     }
1195     return $ip_list;
1196 }
1197
1198 /**
1199  * Get the ip address of the client from REMOTE_ADDR
1200  * or from HTTP_X_FORWARDED_FOR if behind a proxy
1201  * @returns the client ip address
1202  */
1203 function get_ip_address($cfg)
1204 {
1205     $remote = $_SERVER['REMOTE_ADDR'];
1206     if (count($cfg['proxy_ip']) == 0 || !has_http_forwarded()) {
1207         return $remote;
1208     }
1209
1210     $ip_list = get_ip_list_http_forwarded();
1211     if (count($ip_list) == 0) {
1212         return $remote;
1213     }
1214
1215     foreach ($cfg['proxy_ip'] as $proxy_ip) {
1216         if ($remote != $proxy_ip) {
1217             continue;
1218         }
1219         // Take the last IP (the one which has been set by the defined proxy).
1220         return end($ip_list);
1221     }
1222     return $remote;
1223 }
1224
1225 /**
1226  * Convert hexadecimal string to base64
1227  */
1228 function hex_to_base64($hex)
1229 {
1230     $b = '';
1231     foreach (str_split($hex, 2) as $pair) {
1232         $b .= chr(hexdec($pair));
1233     }
1234     return base64_encode($b);
1235 }
1236
1237 /**
1238  * Replace markers in templates.
1239  *
1240  * Available markers have the scheme "###MARKERNAME###".
1241  *
1242  * @param $content string Template text with markers
1243  * @param $htmllinebreaks boolean Convert linebreaks to BR-Tags
1244  * @return Template with replaced markers
1245  */
1246 function jirafeau_replace_markers($content, $htmllinebreaks = false)
1247 {
1248     $patterns = array(
1249         '/###ORGANISATION###/',
1250         '/###CONTACTPERSON###/',
1251         '/###WEBROOT###/'
1252     );
1253     $replacements = array(
1254         $GLOBALS['cfg']['organisation'],
1255         $GLOBALS['cfg']['contactperson'],
1256         $GLOBALS['cfg']['web_root']
1257     );
1258     $content = preg_replace($patterns, $replacements, $content);
1259
1260     if (true === $htmllinebreaks) {
1261         $content = nl2br($content);
1262     }
1263
1264     return $content;
1265 }
1266
1267 function jirafeau_escape($string)
1268 {
1269     return htmlspecialchars($string, ENT_QUOTES);
1270 }
1271
1272 function jirafeau_admin_session_start()
1273 {
1274     $_SESSION['admin_auth'] = true;
1275     $_SESSION['admin_csrf'] = md5(uniqid(mt_rand(), true));
1276 }
1277
1278 function jirafeau_admin_session_end()
1279 {
1280     $_SESSION = array();
1281     session_destroy();
1282 }
1283
1284 function jirafeau_admin_session_logged()
1285 {
1286     return isset($_SESSION['admin_auth']) &&
1287            isset($_SESSION['admin_csrf']) &&
1288            isset($_POST['admin_csrf']) &&
1289            $_SESSION['admin_auth'] === true &&
1290            $_SESSION['admin_csrf'] === $_POST['admin_csrf'];
1291 }
1292
1293 function jirafeau_admin_csrf_field()
1294 {
1295     return "<input type='hidden' name='admin_csrf' value='". $_SESSION['admin_csrf'] . "'/>";
1296 }