includes/session.inc

   1 <?php
   2 /**********************************************************************
   3         Copyright (C) FrontAccounting, LLC.
   4         Released under the terms of the GNU General Public License, GPL,
   5         as published by the Free Software Foundation, either version 3
   6         of the License, or (at your option) any later version.
   7         This program is distributed in the hope that it will be useful,
   8         but WITHOUT ANY WARRANTY; without even the implied warranty of
   9         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  10         See the License here <http://www.gnu.org/licenses/gpl-3.0.html>.
  11 ***********************************************************************/
  12
  13 class SessionManager
  14 {
  15         function sessionStart($name, $limit = 0, $path = '/', $domain = null, $secure = null)
  16         {
  17                 // Set the cookie name
  18                 session_name($name);
  19
  20                 // Set SSL level
  21                 $https = isset($secure) ? $secure : (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off');
  22
  23                 // Set session cookie options
  24                 if (version_compare(PHP_VERSION, '5.2', '<')) // avoid failure on older php versions
  25                         session_set_cookie_params($limit, $path, $domain, $https);
  26                 else
  27                         session_set_cookie_params($limit, $path, $domain, $https, true);
  28
  29                 session_start();
  30
  31                 // Make sure the session hasn't expired, and destroy it if it has
  32                 if ($this->validateSession())
  33                 {
  34                         // Check to see if the session is new or a hijacking attempt
  35                         if(!$this->preventHijacking())
  36                         {
  37                                 // Reset session data and regenerate id
  38                                 $_SESSION = array();
  39                                 $_SESSION['IPaddress'] = $_SERVER['REMOTE_ADDR'];
  40                                 $_SESSION['userAgent'] = @$_SERVER['HTTP_USER_AGENT'];
  41                                 $this->regenerateSession();
  42
  43                         // Give a 5% chance of the session id changing on any request
  44                         }
  45                         elseif (rand(1, 100) <= 5)
  46                         {
  47                                 $this->regenerateSession();
  48                         }
  49                 }
  50                 else
  51                 {
  52                         $_SESSION = array();
  53                         session_destroy();
  54                         session_start();
  55                 }
  56         }
  57
  58         function preventHijacking()
  59         {
  60                 if (!isset($_SESSION['IPaddress']) || !isset($_SESSION['userAgent']))
  61                         return false;
  62
  63                 if ($_SESSION['IPaddress'] != $_SERVER['REMOTE_ADDR'])
  64                         return false;
  65
  66                 if ( $_SESSION['userAgent'] != @$_SERVER['HTTP_USER_AGENT'])
  67                         return false;
  68
  69                 return true;
  70         }
  71
  72         function regenerateSession()
  73         {
  74                 // If this session is obsolete it means there already is a new id
  75                 if (isset($_SESSION['OBSOLETE']) && ($_SESSION['OBSOLETE'] == true))
  76                         return;
  77
  78                 // Set current session to expire in 10 seconds
  79                 $_SESSION['OBSOLETE'] = true;
  80                 $_SESSION['EXPIRES'] = time() + 10;
  81
  82                 // Create new session without destroying the old one
  83                 session_regenerate_id();
  84                 // Grab current session ID and close both sessions to allow other scripts to use them
  85                 $newSession = session_id();
  86                 session_write_close();
  87                 // Set session ID to the new one, and start it back up again
  88
  89                 session_id($newSession);
  90                 session_start();
  91
  92                 // Now we unset the obsolete and expiration values for the session we want to keep
  93                 unset($_SESSION['OBSOLETE']);
  94                 unset($_SESSION['EXPIRES']);
  95         }
  96
  97         function validateSession()
  98         {
  99                 if (isset($_SESSION['OBSOLETE']) && !isset($_SESSION['EXPIRES']) )
 100                         return false;
 101
 102                 if (isset($_SESSION['EXPIRES']) && $_SESSION['EXPIRES'] < time())
 103                         return false;
 104
 105                 return true;
 106         }
 107 }
 108
 109 function output_html($text)
 110 {
 111         global $before_box, $Ajax, $messages;
 112         // Fatal errors are not send to error_handler,
 113         // so we must check the output
 114         if ($text && preg_match('/\bFatal error(<.*?>)?:(.*)/i', $text, $m)) {
 115                 $Ajax->aCommands = array();  // Don't update page via ajax on errors
 116                 $text = preg_replace('/\bFatal error(<.*?>)?:(.*)/i','', $text);
 117                 $messages[] = array(E_ERROR, $m[2], null, null);
 118         }
 119         $Ajax->run();
 120         return  in_ajax() ? fmt_errors() : ($before_box.fmt_errors().$text);
 121 }
 122 //----------------------------------------------------------------------------------------
 123
 124 function kill_login()
 125 {
 126         session_unset();
 127         session_destroy();
 128 }
 129 //----------------------------------------------------------------------------------------
 130
 131 function login_fail()
 132 {
 133         global $path_to_root;
 134
 135         header("HTTP/1.1 401 Authorization Required");
 136         echo "<center><br><br><font size='5' color='red'><b>" . _("Incorrect Password") . "<b></font><br><br>";
 137         echo "<b>" . _("The user and password combination is not valid for the system.") . "<b><br><br>";
 138
 139         echo _("If you are not an authorized user, please contact your system administrator to obtain an account to enable you to use the system.");
 140         echo "<br><a href='$path_to_root/index.php'>" . _("Try again") . "</a>";
 141         echo "</center>";
 142
 143         kill_login();
 144         die();
 145 }
 146
 147 function password_reset_fail()
 148 {
 149         global $path_to_root;
 150
 151   echo "<center><br><br><font size='5' color='red'><b>" . _("Incorrect Email") . "<b></font><br><br>";
 152   echo "<b>" . _("The email address does not exist in the system.") . "<b><br><br>";
 153
 154   echo _("If you are not an authorized user, please contact your system administrator to obtain an account to enable you to use the system.");
 155   echo "<br><a href='$path_to_root/index.php?reset=1'>" . _("Try again") . "</a>";
 156   echo "</center>";
 157
 158         kill_login();
 159         die();
 160 }
 161
 162 function password_reset_success()
 163 {
 164         global $path_to_root;
 165
 166   echo "<center><br><br><font size='5' color='green'><b>" . _("New password sent") . "<b></font><br><br>";
 167   echo "<b>" . _("A new password has been sent to your mailbox.") . "<b><br><br>";
 168
 169   echo "<br><a href='$path_to_root/index.php'>" . _("Login here") . "</a>";
 170   echo "</center>";
 171
 172         kill_login();
 173         die();
 174 }
 175
 176 function check_faillog()
 177 {
 178         global $SysPrefs, $login_faillog;
 179
 180         $user = $_SESSION["wa_current_user"]->user;
 181
 182         if (@$SysPrefs->login_delay && (@$login_faillog[$user][$_SERVER['REMOTE_ADDR']] >= @$SysPrefs->login_max_attempts) && (time() < $login_faillog[$user]['last'] + $SysPrefs->login_delay))
 183                 return true;
 184
 185         return false;
 186 }
 187 /*
 188         Simple brute force attack detection is performed before connection to company database is open. Therefore access counters have to be stored in file.
 189         Login attempts counter is created for every new user IP, which partialy prevent DOS attacks.
 190 */
 191 function write_login_filelog($login, $result)
 192 {
 193         global $login_faillog, $SysPrefs, $path_to_root;
 194
 195         $user = $_SESSION["wa_current_user"]->user;
 196
 197         $ip = $_SERVER['REMOTE_ADDR'];
 198
 199         if (!isset($login_faillog[$user][$ip]) || $result) // init or reset on successfull login
 200                 $login_faillog[$user] = array($ip => 0, 'last' => '');
 201
 202         if (!$result)
 203         {
 204                 if ($login_faillog[$user][$ip] < @$SysPrefs->login_max_attempts) {
 205
 206                         $login_faillog[$user][$ip]++;
 207                 } else {
 208                         $login_faillog[$user][$ip] = 0; // comment out to restart counter only after successfull login.
 209                         error_log(sprintf(_("Brute force attack on account '%s' detected. Access for non-logged users temporarily blocked."     ), $login));
 210                 }
 211                 $login_faillog[$user]['last'] = time();
 212         }
 213
 214         $msg = "<?php\n";
 215         $msg .= "/*\n";
 216         $msg .= "Login attempts info.\n";
 217         $msg .= "*/\n";
 218         $msg .= "\$login_faillog = " .var_export($login_faillog, true). ";\n";
 219
 220         $filename = $path_to_root."/tmp/faillog.php";
 221
 222         if ((!file_exists($filename) && is_writable($path_to_root.'/tmp')) || is_writable($filename))
 223         {
 224                 file_put_contents($filename, $msg);
 225         }
 226 }
 227
 228 //----------------------------------------------------------------------------------------
 229
 230 function check_page_security($page_security)
 231 {
 232         global $SysPrefs;
 233
 234         $msg = '';
 235
 236         if (!$_SESSION["wa_current_user"]->check_user_access())
 237         {
 238                 // notification after upgrade from pre-2.2 version
 239                 $msg = $_SESSION["wa_current_user"]->old_db ?
 240                          _("Security settings have not been defined for your user account.")
 241                                 . "<br>" . _("Please contact your system administrator.")
 242                         : _("Please remove \$security_groups and \$security_headings arrays from config.php file!");
 243         } elseif (!$_SESSION['SysPrefs']->db_ok && !$_SESSION["wa_current_user"]->can_access('SA_SOFTWAREUPGRADE'))
 244         {
 245                 $msg = _('Access to application has been blocked until database upgrade is completed by system administrator.');
 246         }
 247
 248         if ($msg){
 249                 display_error($msg);
 250                 end_page(@$_REQUEST['popup']);
 251                 kill_login();
 252                 exit;
 253         }
 254
 255         if (!$_SESSION["wa_current_user"]->can_access_page($page_security))
 256         {
 257
 258                 echo "<center><br><br><br><b>";
 259                 echo _("The security settings on your account do not permit you to access this function");
 260                 echo "</b>";
 261                 echo "<br><br><br><br></center>";
 262                 end_page(@$_REQUEST['popup']);
 263                 exit;
 264         }
 265         if (!$_SESSION['SysPrefs']->db_ok
 266                 && !in_array($page_security, array('SA_SOFTWAREUPGRADE', 'SA_OPEN', 'SA_BACKUP')))
 267         {
 268                 display_error(_('System is blocked after source upgrade until database is updated on System/Software Upgrade page'));
 269                 end_page();
 270                 exit;
 271         }
 272
 273 }
 274 /*
 275         Helper function for setting page security level depeding on
 276         GET start variable and/or some value stored in session variable.
 277         Before the call $page_security should be set to default page_security value.
 278 */
 279 function set_page_security($value=null, $trans = array(), $gtrans = array())
 280 {
 281         global $page_security;
 282
 283         // first check is this is not start page call
 284         foreach($gtrans as $key => $area)
 285                 if (isset($_GET[$key])) {
 286                         $page_security = $area;
 287                         return;
 288                 }
 289
 290         // then check session value
 291         if (isset($trans[$value])) {
 292                 $page_security = $trans[$value];
 293                 return;
 294         }
 295 }
 296
 297 //-----------------------------------------------------------------------------
 298 //      Removing magic quotes from nested arrays/variables
 299 //
 300 function strip_quotes($data)
 301 {
 302         if(get_magic_quotes_gpc()) {
 303                 if(is_array($data)) {
 304                         foreach($data as $k => $v) {
 305                                 $data[$k] = strip_quotes($data[$k]);
 306                         }
 307                 } else
 308                         return stripslashes($data);
 309         }
 310         return $data;
 311 }
 312
 313 /*
 314         htmlspecialchars does not support certain encodings.
 315         ISO-8859-2 fortunately has the same special characters positions as
 316         ISO-8859-1, so fix is easy. If any other unsupported encoding is used,
 317         add workaround here.
 318 */
 319 function html_specials_encode($str)
 320 {
 321         return htmlspecialchars($str, ENT_QUOTES, $_SESSION['language']->encoding=='iso-8859-2' ?
 322                  'ISO-8859-1' : $_SESSION['language']->encoding);
 323 }
 324
 325 function html_cleanup(&$parms)
 326 {
 327         foreach($parms as $name => $value) {
 328                 if (is_array($value))
 329                         html_cleanup($parms[$name]);
 330                 else
 331                         $parms[$name] = html_specials_encode($value);
 332         }
 333         reset($parms); // needed for direct key() usage later throughout the sources
 334 }
 335
 336 //============================================================================
 337 //
 338 //
 339 function login_timeout()
 340 {
 341         // skip timeout on logout page
 342         if ($_SESSION["wa_current_user"]->logged) {
 343                 $tout = $_SESSION["wa_current_user"]->timeout;
 344                 if ($tout && (time() > $_SESSION["wa_current_user"]->last_act + $tout))
 345                 {
 346                         $_SESSION["wa_current_user"]->logged = false;
 347                 }
 348                 $_SESSION["wa_current_user"]->last_act = time();
 349         }
 350 }
 351 //============================================================================
 352 if (!isset($path_to_root))
 353 {
 354         $path_to_root = ".";
 355 }
 356
 357 // Prevent register_globals vulnerability
 358 if (isset($_GET['path_to_root']) || isset($_POST['path_to_root']))
 359         die("Restricted access");
 360
 361 include_once($path_to_root . "/includes/errors.inc");
 362 // colect all error msgs
 363 set_error_handler('error_handler' /*, errtypes */);
 364
 365 include_once($path_to_root . "/includes/current_user.inc");
 366 include_once($path_to_root . "/frontaccounting.php");
 367 include_once($path_to_root . "/admin/db/security_db.inc");
 368 include_once($path_to_root . "/includes/lang/language.inc");
 369 include_once($path_to_root . "/config_db.php");
 370 include_once($path_to_root . "/includes/ajax.inc");
 371 include_once($path_to_root . "/includes/ui/ui_msgs.inc");
 372 include_once($path_to_root . "/includes/prefs/sysprefs.inc");
 373
 374 include_once($path_to_root . "/includes/hooks.inc");
 375 //
 376 // include all extensions hook files.
 377 //
 378 foreach ($installed_extensions as $ext)
 379 {
 380         if (file_exists($path_to_root.'/'.$ext['path'].'/hooks.php'))
 381                 include_once($path_to_root.'/'.$ext['path'].'/hooks.php');
 382 }
 383
 384 $_SESSION['SysPrefs'] = new sys_prefs();
 385
 386 $SysPrefs = &$_SESSION['SysPrefs'];
 387
 388 //----------------------------------------------------------------------------------------
 389 // set to reasonable values if not set in config file (pre-2.3.12 installations)
 390
 391 if ((!isset($SysPrefs->login_delay)) || ($SysPrefs->login_delay < 0))
 392     $SysPrefs->login_delay = 10;
 393
 394 if ((!isset($SysPrefs->login_max_attempts)) || ($SysPrefs->login_max_attempts < 0))
 395     $SysPrefs->login_max_attempts = 3;
 396
 397 if ($SysPrefs->go_debug > 0)
 398         error_reporting(-1);
 399 else
 400         error_reporting(E_USER_WARNING|E_USER_ERROR|E_USER_NOTICE);
 401 ini_set("display_errors", "On");
 402
 403 if ($SysPrefs->error_logfile != '') {
 404         ini_set("error_log", $SysPrefs->error_logfile);
 405         ini_set("ignore_repeated_errors", "On");
 406         ini_set("log_errors", "On");
 407 }
 408
 409
 410 /*
 411         Uncomment the setting below when using FA on shared hosting
 412         to avoid unexpeced session timeouts.
 413         Make sure this directory exists and is writable!
 414 */
 415 // ini_set('session.save_path', dirname(__FILE__).'/../tmp/');
 416
 417 ini_set('session.gc_maxlifetime', 36000); // 10hrs
 418
 419 hook_session_start(@$_POST["company_login_name"]);
 420
 421 $Session_manager = new SessionManager();
 422 $Session_manager->sessionStart('FA'.md5(dirname(__FILE__)));
 423
 424 // this is to fix the "back-do-you-want-to-refresh" issue - thanx PHPFreaks
 425 header("Cache-control: private");
 426
 427 get_text_init();
 428
 429 if ($SysPrefs->login_delay > 0)
 430         @include_once($path_to_root . "/tmp/faillog.php");
 431
 432 // Page Initialisation
 433 if (!isset($_SESSION['wa_current_user']) || !$_SESSION['wa_current_user']->logged_in()
 434         || !isset($_SESSION['language']) || !method_exists($_SESSION['language'], 'set_language'))
 435 {
 436         $l = array_search_value($dflt_lang, $installed_languages,  'code');
 437         $_SESSION['language'] = new language($l['name'], $l['code'], $l['encoding'],
 438          (isset($l['rtl']) && $l['rtl'] === true) ? 'rtl' : 'ltr');
 439 }
 440
 441 $_SESSION['language']->set_language($_SESSION['language']->code);
 442
 443
 444 include_once($path_to_root . "/includes/access_levels.inc");
 445 include_once($path_to_root . "/version.php");
 446 include_once($path_to_root . "/includes/main.inc");
 447 include_once($path_to_root . "/includes/app_entries.inc");
 448
 449 // Ajax communication object
 450 $Ajax = new Ajax();
 451
 452 // js/php validation rules container
 453 $Validate = array();
 454 // bindings for editors
 455 $Editors = array();
 456 // page help. Currently help for function keys.
 457 $Pagehelp = array();
 458
 459 $Refs = new references();
 460
 461 // intercept all output to destroy it in case of ajax call
 462 register_shutdown_function('end_flush');
 463 ob_start('output_html',0);
 464
 465 if (!isset($_SESSION["wa_current_user"]))
 466         $_SESSION["wa_current_user"] = new current_user();
 467
 468 html_cleanup($_GET);
 469 html_cleanup($_POST);
 470 html_cleanup($_REQUEST);
 471 html_cleanup($_SERVER);
 472
 473 // logout.php is the only page we should have always
 474 // accessable regardless of access level and current login status.
 475 if (!defined('FA_LOGOUT_PHP_FILE')){
 476
 477         login_timeout();
 478
 479         if (!$_SESSION["wa_current_user"]->old_db)
 480                 include_once($path_to_root . '/company/'.user_company().'/installed_extensions.php');
 481
 482         install_hooks();
 483
 484         if (!$_SESSION["wa_current_user"]->logged_in())
 485         {
 486       if (@$SysPrefs->allow_password_reset && !$SysPrefs->allow_demo_mode
 487         && (isset($_GET['reset']) || isset($_POST['email_entry_field']))) {
 488                   if (!isset($_POST["email_entry_field"])) {
 489         include($path_to_root . "/access/password_reset.php");
 490         exit();
 491       }
 492       else {
 493         if (isset($_POST["company_login_nickname"]) && !isset($_POST["company_login_name"])) {
 494           for ($i = 0; $i < count($db_connections); $i++) {
 495             if ($db_connections[$i]["name"] == $_POST["company_login_nickname"]) {
 496               $_POST["company_login_name"] = $i;
 497               unset($_POST["company_login_nickname"]);
 498               break 1; // cannot pass variables to break from PHP v5.4 onwards
 499             }
 500           }
 501         }
 502         $_succeed = isset($db_connections[$_POST["company_login_name"]]) &&
 503           $_SESSION["wa_current_user"]->reset_password($_POST["company_login_name"],
 504           $_POST["email_entry_field"]);
 505         if ($_succeed)
 506         {
 507           password_reset_success();
 508         }
 509
 510         password_reset_fail();
 511       }
 512     }
 513                 // Show login screen
 514                 if (!isset($_POST["user_name_entry_field"]) or $_POST["user_name_entry_field"] == "")
 515                 {
 516                         // strip ajax marker from uri, to force synchronous page reload
 517                         $_SESSION['timeout'] = array( 'uri'=>preg_replace('/JsHttpRequest=(?:(\d+)-)?([^&]+)/s',
 518                                         '', html_specials_encode($_SERVER['REQUEST_URI'])),
 519                                 'post' => $_POST);
 520
 521                         include($path_to_root . "/access/login.php");
 522                         if (in_ajax())
 523                                 $Ajax->activate('_page_body');
 524                         exit;
 525                 } else {
 526                         if (isset($_POST["company_login_nickname"]) && !isset($_POST["company_login_name"])) {
 527                                 for ($i = 0; $i < count($db_connections); $i++) {
 528                                         if ($db_connections[$i]["name"] == $_POST["company_login_nickname"]) {
 529                                                 $_POST["company_login_name"] = $i;
 530                                                 unset($_POST["company_login_nickname"]);
 531                                                 break 1; // cannot pass variables to break from PHP v5.4 onwards
 532                                         }
 533                                 }
 534                         }
 535                         $succeed = isset($db_connections[$_POST["company_login_name"]]) &&
 536                                 $_SESSION["wa_current_user"]->login($_POST["company_login_name"],
 537                                 $_POST["user_name_entry_field"], $_POST["password"]);
 538                         // select full vs fallback ui mode on login
 539                         $_SESSION["wa_current_user"]->ui_mode = $_POST['ui_mode'];
 540                         if (!$succeed)
 541                         {
 542                         // Incorrect password
 543                                 login_fail();
 544                         }
 545                         elseif(isset($_SESSION['timeout']) && !$_SESSION['timeout']['post'])
 546                         {
 547                                 // in case of GET request redirect to avoid confirmation dialog
 548                                 // after return from menu option
 549                                 header("HTTP/1.1 303 See Other");
 550                                 header("Location: ".$_SESSION['timeout']['uri']);
 551                                 exit();
 552                         }
 553                         $lang = &$_SESSION['language'];
 554                         $lang->set_language($_SESSION['language']->code);
 555                 }
 556         } else
 557         {       set_global_connection();
 558                         if (db_fixed())
 559                                 db_set_encoding($_SESSION['language']->encoding);
 560         }
 561
 562         if (!isset($_SESSION["App"])) {
 563                 $_SESSION["App"] = new front_accounting();
 564                 $_SESSION["App"]->init();
 565         }
 566 }
 567
 568
 569 // POST vars cleanup needed for direct reuse.
 570 // We quote all values later with db_escape() before db update.
 571 $_POST = strip_quotes($_POST);