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 check_faillog()
 148 {
 149         global $login_delay, $login_faillog, $login_max_attempts;
 150
 151         $user = $_SESSION["wa_current_user"]->user;
 152
 153         if (@$login_delay && (@$login_faillog[$user][$_SERVER['REMOTE_ADDR']] >= @$login_max_attempts) && (time() < $login_faillog[$user]['last'] + $login_delay))
 154                 return true;
 155
 156         return false;
 157 }
 158 /*
 159         Simple brute force attack detection is performed before connection to company database is open. Therefore access counters have to be stored in file.
 160         Login attempts counter is created for every new user IP, which partialy prevent DOS attacks.
 161 */
 162 function write_login_filelog($login, $result)
 163 {
 164         global $login_faillog, $login_max_attempts, $path_to_root;
 165
 166         $user = $_SESSION["wa_current_user"]->user;
 167
 168         $ip = $_SERVER['REMOTE_ADDR'];
 169
 170         if (!isset($login_faillog[$user][$ip]) || $result) // init or reset on successfull login
 171                 $login_faillog[$user] = array($ip => 0, 'last' => '');
 172
 173         if (!$result)
 174         {
 175                 if ($login_faillog[$user][$ip] < @$login_max_attempts) {
 176
 177                         $login_faillog[$user][$ip]++;
 178                 } else {
 179                         $login_faillog[$user][$ip] = 0; // comment out to restart counter only after successfull login.
 180                         error_log(sprintf(_("Brute force attack on account '%s' detected. Access for non-logged users temporarily blocked."     ), $login));
 181                 }
 182                 $login_faillog[$user]['last'] = time();
 183         }
 184
 185         $msg = "<?php\n";
 186         $msg .= "/*\n";
 187         $msg .= "Login attempts info.\n";
 188         $msg .= "*/\n";
 189         $msg .= "\$login_faillog = " .var_export($login_faillog, true). ";\n";
 190
 191         $filename = $path_to_root."/tmp/faillog.php";
 192
 193         if ((!file_exists($filename) && is_writable($path_to_root)) || is_writable($filename))
 194         {
 195                 file_put_contents($filename, $msg);
 196         }
 197 }
 198
 199 //----------------------------------------------------------------------------------------
 200
 201 function check_page_security($page_security)
 202 {
 203         global $SysPrefs;
 204
 205         $msg = '';
 206
 207         if (!$_SESSION["wa_current_user"]->check_user_access())
 208         {
 209                 // notification after upgrade from pre-2.2 version
 210                 $msg = $_SESSION["wa_current_user"]->old_db ?
 211                          _("Security settings have not been defined for your user account.")
 212                                 . "<br>" . _("Please contact your system administrator.")
 213                         : _("Please remove \$security_groups and \$security_headings arrays from config.php file!");
 214         } elseif (!$_SESSION['SysPrefs']->db_ok && !$_SESSION["wa_current_user"]->can_access('SA_SOFTWAREUPGRADE')) {
 215                 $msg = _('Access to application has been blocked until database upgrade is completed by system administrator.');
 216         }
 217
 218         if ($msg){
 219                 display_error($msg);
 220                 end_page(@$_REQUEST['popup']);
 221                 kill_login();
 222                 exit;
 223         }
 224
 225         if (!$_SESSION["wa_current_user"]->can_access_page($page_security))
 226         {
 227
 228                 echo "<center><br><br><br><b>";
 229                 echo _("The security settings on your account do not permit you to access this function");
 230                 echo "</b>";
 231                 echo "<br><br><br><br></center>";
 232                 end_page(@$_REQUEST['popup']);
 233                 exit;
 234         }
 235         if (!$_SESSION['SysPrefs']->db_ok
 236                 && !in_array($page_security, array('SA_SOFTWAREUPGRADE', 'SA_OPEN', 'SA_BACKUP')))
 237         {
 238                 display_error(_('System is blocked after source upgrade until database is updated on System/Software Upgrade page'));
 239                 end_page();
 240                 exit;
 241         }
 242
 243 }
 244 /*
 245         Helper function for setting page security level depeding on
 246         GET start variable and/or some value stored in session variable.
 247         Before the call $page_security should be set to default page_security value.
 248 */
 249 function set_page_security($value=null, $trans = array(), $gtrans = array())
 250 {
 251         global $page_security;
 252
 253         // first check is this is not start page call
 254         foreach($gtrans as $key => $area)
 255                 if (isset($_GET[$key])) {
 256                         $page_security = $area;
 257                         return;
 258                 }
 259
 260         // then check session value
 261         if (isset($trans[$value])) {
 262                 $page_security = $trans[$value];
 263                 return;
 264         }
 265 }
 266
 267 //-----------------------------------------------------------------------------
 268 //      Removing magic quotes from nested arrays/variables
 269 //
 270 function strip_quotes($data)
 271 {
 272         if(get_magic_quotes_gpc()) {
 273                 if(is_array($data)) {
 274                         foreach($data as $k => $v) {
 275                                 $data[$k] = strip_quotes($data[$k]);
 276                         }
 277                 } else
 278                         return stripslashes($data);
 279         }
 280         return $data;
 281 }
 282
 283 function html_cleanup(&$parms)
 284 {
 285         foreach($parms as $name => $value) {
 286 //              $value = @html_entity_decode($value, ENT_QUOTES, $_SESSION['language']->encoding);
 287                 if (is_array($value))
 288                         html_cleanup($parms[$name]);
 289                 else
 290                         $parms[$name] = @htmlspecialchars($value, ENT_QUOTES, $_SESSION['language']->encoding);
 291         }
 292         reset($parms); // needed for direct key() usage later throughout the sources
 293 }
 294
 295 //============================================================================
 296 //
 297 //
 298 function login_timeout()
 299 {
 300         // skip timeout on logout page
 301         if ($_SESSION["wa_current_user"]->logged) {
 302                 $tout = $_SESSION["wa_current_user"]->timeout;
 303                 if ($tout && (time() > $_SESSION["wa_current_user"]->last_act + $tout))
 304                 {
 305                         $_SESSION["wa_current_user"]->logged = false;
 306                 }
 307                 $_SESSION["wa_current_user"]->last_act = time();
 308         }
 309 }
 310 //============================================================================
 311 if (!isset($path_to_root))
 312 {
 313         $path_to_root = ".";
 314 }
 315
 316 //----------------------------------------------------------------------------------------
 317 // set to reasonable values if not set in config file (pre-2.3.12 installations)
 318
 319 if ((!isset($login_delay)) || ($login_delay < 0))
 320     $login_delay = 10;
 321
 322 if ((!isset($login_max_attempts)) || ($login_max_attempts < 0))
 323     $login_max_attempts = 3;
 324
 325
 326 // Prevent register_globals vulnerability
 327 if (isset($_GET['path_to_root']) || isset($_POST['path_to_root']))
 328         die("Restricted access");
 329
 330 include_once($path_to_root . "/includes/errors.inc");
 331 // colect all error msgs
 332 set_error_handler('error_handler' /*, errtypes */);
 333
 334 include_once($path_to_root . "/includes/current_user.inc");
 335 include_once($path_to_root . "/frontaccounting.php");
 336 include_once($path_to_root . "/admin/db/security_db.inc");
 337 include_once($path_to_root . "/includes/lang/language.php");
 338 include_once($path_to_root . "/config_db.php");
 339 include_once($path_to_root . "/includes/ajax.inc");
 340 include_once($path_to_root . "/includes/ui/ui_msgs.inc");
 341 include_once($path_to_root . "/includes/prefs/sysprefs.inc");
 342
 343 include_once($path_to_root . "/includes/hooks.inc");
 344 //
 345 // include all extensions hook files.
 346 //
 347 foreach ($installed_extensions as $ext)
 348 {
 349         if (file_exists($path_to_root.'/'.$ext['path'].'/hooks.php'))
 350                 include_once($path_to_root.'/'.$ext['path'].'/hooks.php');
 351 }
 352
 353 /*
 354         Uncomment the setting below when using FA on shared hosting
 355         to avoid unexpeced session timeouts.
 356         Make sure this directory exists and is writable!
 357 */
 358 // ini_set('session.save_path', dirname(__FILE__).'/../tmp/');
 359
 360 ini_set('session.gc_maxlifetime', 36000); // 10hrs
 361
 362 $Session_manager = new SessionManager();
 363 $Session_manager->sessionStart('FA'.md5(dirname(__FILE__)));
 364
 365 // this is to fix the "back-do-you-want-to-refresh" issue - thanx PHPFreaks
 366 header("Cache-control: private");
 367
 368 include_once($path_to_root . "/config.php");
 369 get_text_init();
 370
 371 if ($login_delay > 0)
 372         @include_once($path_to_root . "/tmp/faillog.php");
 373
 374 // Page Initialisation
 375 if (!isset($_SESSION['language']) || !method_exists($_SESSION['language'], 'set_language'))
 376 {
 377         $l = array_search_value($dflt_lang, $installed_languages,  'code');
 378         $_SESSION['language'] = new language($l['name'], $l['code'], $l['encoding'],
 379          (isset($l['rtl']) && $l['rtl'] === true) ? 'rtl' : 'ltr');
 380 }
 381
 382 $_SESSION['language']->set_language($_SESSION['language']->code);
 383
 384
 385 include_once($path_to_root . "/includes/access_levels.inc");
 386 include_once($path_to_root . "/version.php");
 387 include_once($path_to_root . "/includes/main.inc");
 388
 389 // Ajax communication object
 390 $Ajax = new Ajax();
 391
 392 // js/php validation rules container
 393 $Validate = array();
 394 // bindings for editors
 395 $Editors = array();
 396 // page help. Currently help for function keys.
 397 $Pagehelp = array();
 398
 399 $Refs = new references();
 400
 401 // intercept all output to destroy it in case of ajax call
 402 register_shutdown_function('end_flush');
 403 ob_start('output_html',0);
 404
 405 if (!isset($_SESSION["wa_current_user"]))
 406         $_SESSION["wa_current_user"] = new current_user();
 407
 408 html_cleanup($_GET);
 409 html_cleanup($_POST);
 410 html_cleanup($_REQUEST);
 411 html_cleanup($_SERVER);
 412
 413 // logout.php is the only page we should have always
 414 // accessable regardless of access level and current login status.
 415 if (strstr($_SERVER['PHP_SELF'], 'logout.php') == false){
 416
 417         login_timeout();
 418
 419         if (!$_SESSION["wa_current_user"]->old_db)
 420                 include_once($path_to_root . '/company/'.user_company().'/installed_extensions.php');
 421
 422         install_hooks();
 423
 424         if (!$_SESSION["wa_current_user"]->logged_in())
 425         {
 426                 // Show login screen
 427                 if (!isset($_POST["user_name_entry_field"]) or $_POST["user_name_entry_field"] == "")
 428                 {
 429                         // strip ajax marker from uri, to force synchronous page reload
 430                         $_SESSION['timeout'] = array( 'uri'=>preg_replace('/JsHttpRequest=(?:(\d+)-)?([^&]+)/s',
 431                                         '', @htmlspecialchars($_SERVER['REQUEST_URI'], ENT_QUOTES, $_SESSION['language']->encoding)),
 432                                 'post' => $_POST);
 433
 434                         include($path_to_root . "/access/login.php");
 435                         if (in_ajax())
 436                                 $Ajax->activate('_page_body');
 437                         exit;
 438                 } else {
 439                         if (isset($_POST["company_login_nickname"]) && !isset($_POST["company_login_name"])) {
 440                                 for ($i = 0; $i < count($db_connections); $i++) {
 441                                         if ($db_connections[$i]["name"] == $_POST["company_login_nickname"]) {
 442                                                 $_POST["company_login_name"] = $i;
 443                                                 unset($_POST["company_login_nickname"]);
 444                                                 break 1; // cannot pass variables to break from PHP v5.4 onwards
 445                                         }
 446                                 }
 447                         }
 448                         $succeed = isset($db_connections[$_POST["company_login_name"]]) &&
 449                                 $_SESSION["wa_current_user"]->login($_POST["company_login_name"],
 450                                 $_POST["user_name_entry_field"], $_POST["password"]);
 451                         // select full vs fallback ui mode on login
 452                         $_SESSION["wa_current_user"]->ui_mode = $_POST['ui_mode'];
 453                         if (!$succeed)
 454                         {
 455                         // Incorrect password
 456                                 login_fail();
 457                         }
 458                         elseif(isset($_SESSION['timeout']) && !$_SESSION['timeout']['post'])
 459                         {
 460                                 // in case of GET request redirect to avoid confirmation dialog
 461                                 // after return from menu option
 462                                 header("HTTP/1.1 303 See Other");
 463                                 header("Location: ".$_SESSION['timeout']['uri']);
 464                                 exit();
 465                         }
 466                         $lang = &$_SESSION['language'];
 467                         $lang->set_language($_SESSION['language']->code);
 468                 }
 469         } else
 470                 set_global_connection();
 471
 472         if (!isset($_SESSION["App"])) {
 473                 $_SESSION["App"] = new front_accounting();
 474                 $_SESSION["App"]->init();
 475         }
 476 }
 477
 478 $SysPrefs = &$_SESSION['SysPrefs'];
 479
 480 // POST vars cleanup needed for direct reuse.
 481 // We quote all values later with db_escape() before db update.
 482 $_POST = strip_quotes($_POST);
 483
 484 ?>