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) ? $secure : isset($_SERVER['HTTPS']);
  22
  23                 // Set session cookie options
  24                 session_set_cookie_params($limit, $path, $domain, $https, true);
  25                 session_start();
  26
  27                 // Make sure the session hasn't expired, and destroy it if it has
  28                 if ($this->validateSession())
  29                 {
  30                         // Check to see if the session is new or a hijacking attempt
  31                         if(!$this->preventHijacking())
  32                         {
  33                                 // Reset session data and regenerate id
  34                                 $_SESSION = array();
  35                                 $_SESSION['IPaddress'] = $_SERVER['REMOTE_ADDR'];
  36                                 $_SESSION['userAgent'] = $_SERVER['HTTP_USER_AGENT'];
  37                                 $this->regenerateSession();
  38
  39                         // Give a 5% chance of the session id changing on any request
  40                         }
  41                         elseif (rand(1, 100) <= 5)
  42                         {
  43                                 $this->regenerateSession();
  44                         }
  45                 }
  46                 else
  47                 {
  48                         $_SESSION = array();
  49                         session_destroy();
  50                         session_start();
  51                 }
  52         }
  53
  54         function preventHijacking()
  55         {
  56                 if (!isset($_SESSION['IPaddress']) || !isset($_SESSION['userAgent']))
  57                         return false;
  58
  59                 if ($_SESSION['IPaddress'] != $_SERVER['REMOTE_ADDR'])
  60                         return false;
  61
  62                 if ( $_SESSION['userAgent'] != $_SERVER['HTTP_USER_AGENT'])
  63                         return false;
  64
  65                 return true;
  66         }
  67
  68         function regenerateSession()
  69         {
  70                 // If this session is obsolete it means there already is a new id
  71                 if (isset($_SESSION['OBSOLETE']) && ($_SESSION['OBSOLETE'] == true))
  72                         return;
  73
  74                 // Set current session to expire in 10 seconds
  75                 $_SESSION['OBSOLETE'] = true;
  76                 $_SESSION['EXPIRES'] = time() + 10;
  77
  78                 // Create new session without destroying the old one
  79                 session_regenerate_id();
  80
  81                 // Grab current session ID and close both sessions to allow other scripts to use them
  82                 $newSession = session_id();
  83                 session_write_close();
  84                 // Set session ID to the new one, and start it back up again
  85
  86                 session_id($newSession);
  87                 session_start();
  88
  89                 // Now we unset the obsolete and expiration values for the session we want to keep
  90                 unset($_SESSION['OBSOLETE']);
  91                 unset($_SESSION['EXPIRES']);
  92         }
  93
  94         function validateSession()
  95         {
  96                 if (isset($_SESSION['OBSOLETE']) && !isset($_SESSION['EXPIRES']) )
  97                         return false;
  98
  99                 if (isset($_SESSION['EXPIRES']) && $_SESSION['EXPIRES'] < time())
 100                         return false;
 101
 102                 return true;
 103         }
 104 }
 105 function output_html($text)
 106 {
 107         global $before_box, $Ajax, $messages;
 108         // Fatal errors are not send to error_handler,
 109         // so we must check the output
 110         if ($text && preg_match('/\bFatal error(<.*?>)?:(.*)/i', $text, $m)) {
 111                 $Ajax->aCommands = array();  // Don't update page via ajax on errors
 112                 $text = preg_replace('/\bFatal error(<.*?>)?:(.*)/i','', $text);
 113                 $messages[] = array(E_ERROR, $m[2], null, null);
 114         }
 115         $Ajax->run();
 116         return  in_ajax() ? fmt_errors() : ($before_box.fmt_errors().$text);
 117 }
 118 //----------------------------------------------------------------------------------------
 119
 120 function kill_login()
 121 {
 122         session_unset();
 123         session_destroy();
 124 }
 125 //----------------------------------------------------------------------------------------
 126
 127 function login_fail()
 128 {
 129         global $path_to_root;
 130
 131         header("HTTP/1.1 401 Authorization Required");
 132         echo "<center><br><br><font size='5' color='red'><b>" . _("Incorrect Password") . "<b></font><br><br>";
 133         echo "<b>" . _("The user and password combination is not valid for the system.") . "<b><br><br>";
 134
 135         echo _("If you are not an authorized user, please contact your system administrator to obtain an account to enable you to use the system.");
 136         echo "<br><a href='$path_to_root/index.php'>" . _("Try again") . "</a>";
 137         echo "</center>";
 138
 139         kill_login();
 140         die();
 141 }
 142
 143 //----------------------------------------------------------------------------------------
 144
 145 function check_page_security($page_security)
 146 {
 147         global $SysPrefs;
 148
 149         $msg = '';
 150
 151         if (!$_SESSION["wa_current_user"]->check_user_access())
 152         {
 153                 // notification after upgrade from pre-2.2 version
 154                 $msg = $_SESSION["wa_current_user"]->old_db ?
 155                          _("Security settings have not been defined for your user account.")
 156                                 . "<br>" . _("Please contact your system administrator.")
 157                         : _("Please remove \$security_groups and \$security_headings arrays from config.php file!");
 158         } elseif (!$_SESSION['SysPrefs']->db_ok && !$_SESSION["wa_current_user"]->can_access('SA_SOFTWAREUPGRADE')) {
 159                 $msg = _('Access to application has been blocked until database upgrade is completed by system administrator.');
 160         }
 161
 162         if ($msg){
 163                 display_error($msg);
 164                 end_page(@$_REQUEST['popup']);
 165                 kill_login();
 166                 exit;
 167         }
 168
 169         if (!$_SESSION["wa_current_user"]->can_access_page($page_security))
 170         {
 171
 172                 echo "<center><br><br><br><b>";
 173                 echo _("The security settings on your account do not permit you to access this function");
 174                 echo "</b>";
 175                 echo "<br><br><br><br></center>";
 176                 end_page(@$_REQUEST['popup']);
 177                 exit;
 178         }
 179         if (!$_SESSION['SysPrefs']->db_ok
 180                 && !in_array($page_security, array('SA_SOFTWAREUPGRADE', 'SA_OPEN', 'SA_BACKUP')))
 181         {
 182                 display_error(_('System is blocked after source upgrade until database is updated on System/Software Upgrade page'));
 183                 end_page();
 184                 exit;
 185         }
 186
 187 }
 188 /*
 189         Helper function for setting page security level depeding on
 190         GET start variable and/or some value stored in session variable.
 191         Before the call $page_security should be set to default page_security value.
 192 */
 193 function set_page_security($value=null, $trans = array(), $gtrans = array())
 194 {
 195         global $page_security;
 196
 197         // first check is this is not start page call
 198         foreach($gtrans as $key => $area)
 199                 if (isset($_GET[$key])) {
 200                         $page_security = $area;
 201                         return;
 202                 }
 203
 204         // then check session value
 205         if (isset($trans[$value])) {
 206                 $page_security = $trans[$value];
 207                 return;
 208         }
 209 }
 210
 211 //-----------------------------------------------------------------------------
 212 //      Removing magic quotes from nested arrays/variables
 213 //
 214 function strip_quotes($data)
 215 {
 216         if(get_magic_quotes_gpc()) {
 217                 if(is_array($data)) {
 218                         foreach($data as $k => $v) {
 219                                 $data[$k] = strip_quotes($data[$k]);
 220                         }
 221                 } else
 222                         return stripslashes($data);
 223         }
 224         return $data;
 225 }
 226
 227 function html_cleanup(&$parms)
 228 {
 229         foreach($parms as $name => $value) {
 230 //              $value = @html_entity_decode($value, ENT_QUOTES, $_SESSION['language']->encoding);
 231                 if (is_array($value))
 232                         html_cleanup($parms[$name]);
 233                 else
 234                         $parms[$name] = @htmlspecialchars($value, ENT_QUOTES, $_SESSION['language']->encoding);
 235         }
 236         reset($parms); // needed for direct key() usage later throughout the sources
 237 }
 238
 239 //============================================================================
 240 //
 241 //
 242 function login_timeout()
 243 {
 244         // skip timeout on logout page
 245         if ($_SESSION["wa_current_user"]->logged) {
 246                 $tout = $_SESSION["wa_current_user"]->timeout;
 247                 if ($tout && (time() > $_SESSION["wa_current_user"]->last_act + $tout))
 248                 {
 249                         $_SESSION["wa_current_user"]->logged = false;
 250                 }
 251                 $_SESSION["wa_current_user"]->last_act = time();
 252         }
 253 }
 254 //============================================================================
 255 if (!isset($path_to_root))
 256 {
 257         $path_to_root = ".";
 258 }
 259
 260 // Prevent register_globals vulnerability
 261 if (isset($_GET['path_to_root']) || isset($_POST['path_to_root']))
 262         die("Restricted access");
 263
 264 include_once($path_to_root . "/includes/errors.inc");
 265 // colect all error msgs
 266 set_error_handler('error_handler' /*, errtypes */);
 267
 268 include_once($path_to_root . "/includes/current_user.inc");
 269 include_once($path_to_root . "/frontaccounting.php");
 270 include_once($path_to_root . "/admin/db/security_db.inc");
 271 include_once($path_to_root . "/includes/lang/language.php");
 272 include_once($path_to_root . "/config_db.php");
 273 include_once($path_to_root . "/includes/ajax.inc");
 274 include_once($path_to_root . "/includes/ui/ui_msgs.inc");
 275 include_once($path_to_root . "/includes/prefs/sysprefs.inc");
 276
 277 include_once($path_to_root . "/includes/hooks.inc");
 278 //
 279 // include all extensions hook files.
 280 //
 281 foreach ($installed_extensions as $ext)
 282 {
 283         if (file_exists($path_to_root.'/'.$ext['path'].'/hooks.php'))
 284                 include_once($path_to_root.'/'.$ext['path'].'/hooks.php');
 285 }
 286
 287 /*
 288         Uncomment the setting below when using FA on shared hosting
 289         to avoid unexpeced session timeouts.
 290         Make sure this directory exists and is writable!
 291 */
 292 // ini_set('session.save_path', dirname(__FILE__).'/../tmp/');
 293
 294 ini_set('session.gc_maxlifetime', 36000); // 10hrs
 295
 296 hook_session_start(@$_POST["company_login_name"]);
 297
 298 $Session_manager = new SessionManager();
 299 $Session_manager->sessionStart('FA'.md5(dirname(__FILE__)));
 300
 301 // this is to fix the "back-do-you-want-to-refresh" issue - thanx PHPFreaks
 302 header("Cache-control: private");
 303
 304 include_once($path_to_root . "/config.php");
 305 get_text_init();
 306
 307 // Page Initialisation
 308 if (!isset($_SESSION['language']) || !method_exists($_SESSION['language'], 'set_language'))
 309 {
 310         $l = array_search_value($dflt_lang, $installed_languages,  'code');
 311         $_SESSION['language'] = new language($l['name'], $l['code'], $l['encoding'],
 312          (isset($l['rtl']) && $l['rtl'] === true) ? 'rtl' : 'ltr');
 313 }
 314
 315 $_SESSION['language']->set_language($_SESSION['language']->code);
 316
 317
 318 include_once($path_to_root . "/includes/access_levels.inc");
 319 include_once($path_to_root . "/version.php");
 320 include_once($path_to_root . "/includes/main.inc");
 321 include_once($path_to_root . "/includes/app_entries.inc");
 322
 323 // Ajax communication object
 324 $Ajax = new Ajax();
 325
 326 // js/php validation rules container
 327 $Validate = array();
 328 // bindings for editors
 329 $Editors = array();
 330 // page help. Currently help for function keys.
 331 $Pagehelp = array();
 332
 333 $Refs = new references();
 334
 335 // intercept all output to destroy it in case of ajax call
 336 register_shutdown_function('end_flush');
 337 ob_start('output_html',0);
 338
 339 if (!isset($_SESSION["wa_current_user"]))
 340         $_SESSION["wa_current_user"] = new current_user();
 341
 342 html_cleanup($_GET);
 343 html_cleanup($_POST);
 344 html_cleanup($_REQUEST);
 345 html_cleanup($_SERVER);
 346
 347 // logout.php is the only page we should have always
 348 // accessable regardless of access level and current login status.
 349 if (strstr($_SERVER['PHP_SELF'], 'logout.php') == false){
 350
 351         login_timeout();
 352
 353         if (!$_SESSION["wa_current_user"]->old_db)
 354                 include_once($path_to_root . '/company/'.user_company().'/installed_extensions.php');
 355
 356         install_hooks();
 357
 358         if (!$_SESSION["wa_current_user"]->logged_in())
 359         {
 360                 // Show login screen
 361                 if (!isset($_POST["user_name_entry_field"]) or $_POST["user_name_entry_field"] == "")
 362                 {
 363                         // strip ajax marker from uri, to force synchronous page reload
 364                         $_SESSION['timeout'] = array( 'uri'=>preg_replace('/JsHttpRequest=(?:(\d+)-)?([^&]+)/s',
 365                                         '', @htmlspecialchars($_SERVER['REQUEST_URI'], ENT_QUOTES, $_SESSION['language']->encoding)),
 366                                 'post' => $_POST);
 367
 368                         include($path_to_root . "/access/login.php");
 369                         if (in_ajax())
 370                                 $Ajax->activate('_page_body');
 371                         exit;
 372                 } else {
 373
 374                         $succeed = isset($db_connections[$_POST["company_login_name"]]) &&
 375                                 $_SESSION["wa_current_user"]->login($_POST["company_login_name"],
 376                                 $_POST["user_name_entry_field"], $_POST["password"]);
 377                         // select full vs fallback ui mode on login
 378                         $_SESSION["wa_current_user"]->ui_mode = $_POST['ui_mode'];
 379                         if (!$succeed)
 380                         {
 381                         // Incorrect password
 382                                 login_fail();
 383                         }
 384                         $lang = &$_SESSION['language'];
 385                         $lang->set_language($_SESSION['language']->code);
 386                 }
 387         } else
 388                 set_global_connection();
 389
 390         if (!isset($_SESSION["App"])) {
 391                 $_SESSION["App"] = new front_accounting();
 392                 $_SESSION["App"]->init();
 393         }
 394 }
 395
 396 $SysPrefs = &$_SESSION['SysPrefs'];
 397
 398 // POST vars cleanup needed for direct reuse.
 399 // We quote all values later with db_escape() before db update.
 400 $_POST = strip_quotes($_POST);