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 destroying the old one if posiible
  79                 if (phpversion() >= "5.1.0")
  80                         session_regenerate_id(true);
  81                 else
  82                         session_regenerate_id();
  83
  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 //----------------------------------------------------------------------------------------
 148
 149 function check_page_security($page_security)
 150 {
 151         global $SysPrefs;
 152
 153         $msg = '';
 154
 155         if (!$_SESSION["wa_current_user"]->check_user_access())
 156         {
 157                 // notification after upgrade from pre-2.2 version
 158                 $msg = $_SESSION["wa_current_user"]->old_db ?
 159                          _("Security settings have not been defined for your user account.")
 160                                 . "<br>" . _("Please contact your system administrator.")
 161                         : _("Please remove \$security_groups and \$security_headings arrays from config.php file!");
 162         } elseif (!$_SESSION['SysPrefs']->db_ok && !$_SESSION["wa_current_user"]->can_access('SA_SOFTWAREUPGRADE')) {
 163                 $msg = _('Access to application has been blocked until database upgrade is completed by system administrator.');
 164         }
 165
 166         if ($msg){
 167                 display_error($msg);
 168                 end_page(@$_REQUEST['popup']);
 169                 kill_login();
 170                 exit;
 171         }
 172
 173         if (!$_SESSION["wa_current_user"]->can_access_page($page_security))
 174         {
 175
 176                 echo "<center><br><br><br><b>";
 177                 echo _("The security settings on your account do not permit you to access this function");
 178                 echo "</b>";
 179                 echo "<br><br><br><br></center>";
 180                 end_page(@$_REQUEST['popup']);
 181                 exit;
 182         }
 183         if (!$_SESSION['SysPrefs']->db_ok
 184                 && !in_array($page_security, array('SA_SOFTWAREUPGRADE', 'SA_OPEN', 'SA_BACKUP')))
 185         {
 186                 display_error(_('System is blocked after source upgrade until database is updated on System/Software Upgrade page'));
 187                 end_page();
 188                 exit;
 189         }
 190
 191 }
 192 /*
 193         Helper function for setting page security level depeding on
 194         GET start variable and/or some value stored in session variable.
 195         Before the call $page_security should be set to default page_security value.
 196 */
 197 function set_page_security($value=null, $trans = array(), $gtrans = array())
 198 {
 199         global $page_security;
 200
 201         // first check is this is not start page call
 202         foreach($gtrans as $key => $area)
 203                 if (isset($_GET[$key])) {
 204                         $page_security = $area;
 205                         return;
 206                 }
 207
 208         // then check session value
 209         if (isset($trans[$value])) {
 210                 $page_security = $trans[$value];
 211                 return;
 212         }
 213 }
 214
 215 //-----------------------------------------------------------------------------
 216 //      Removing magic quotes from nested arrays/variables
 217 //
 218 function strip_quotes($data)
 219 {
 220         if(get_magic_quotes_gpc()) {
 221                 if(is_array($data)) {
 222                         foreach($data as $k => $v) {
 223                                 $data[$k] = strip_quotes($data[$k]);
 224                         }
 225                 } else
 226                         return stripslashes($data);
 227         }
 228         return $data;
 229 }
 230
 231 function html_cleanup(&$parms)
 232 {
 233         foreach($parms as $name => $value) {
 234 //              $value = @html_entity_decode($value, ENT_QUOTES, $_SESSION['language']->encoding);
 235                 if (is_array($value))
 236                         html_cleanup($parms[$name]);
 237                 else
 238                         $parms[$name] = @htmlspecialchars($value, ENT_QUOTES, $_SESSION['language']->encoding);
 239         }
 240         reset($parms); // needed for direct key() usage later throughout the sources
 241 }
 242
 243 //============================================================================
 244 //
 245 //
 246 function login_timeout()
 247 {
 248         // skip timeout on logout page
 249         if ($_SESSION["wa_current_user"]->logged) {
 250                 $tout = $_SESSION["wa_current_user"]->timeout;
 251                 if ($tout && (time() > $_SESSION["wa_current_user"]->last_act + $tout))
 252                 {
 253                         $_SESSION["wa_current_user"]->logged = false;
 254                 }
 255                 $_SESSION["wa_current_user"]->last_act = time();
 256         }
 257 }
 258 //============================================================================
 259 if (!isset($path_to_root))
 260 {
 261         $path_to_root = ".";
 262 }
 263
 264 // Prevent register_globals vulnerability
 265 if (isset($_GET['path_to_root']) || isset($_POST['path_to_root']))
 266         die("Restricted access");
 267
 268 include_once($path_to_root . "/includes/errors.inc");
 269 // colect all error msgs
 270 set_error_handler('error_handler' /*, errtypes */);
 271
 272 include_once($path_to_root . "/includes/current_user.inc");
 273 include_once($path_to_root . "/frontaccounting.php");
 274 include_once($path_to_root . "/admin/db/security_db.inc");
 275 include_once($path_to_root . "/includes/lang/language.php");
 276 include_once($path_to_root . "/config_db.php");
 277 include_once($path_to_root . "/includes/ajax.inc");
 278 include_once($path_to_root . "/includes/ui/ui_msgs.inc");
 279 include_once($path_to_root . "/includes/prefs/sysprefs.inc");
 280
 281 include_once($path_to_root . "/includes/hooks.inc");
 282 //
 283 // include all extensions hook files.
 284 //
 285 foreach ($installed_extensions as $ext)
 286 {
 287         if (file_exists($path_to_root.'/'.$ext['path'].'/hooks.php'))
 288                 include_once($path_to_root.'/'.$ext['path'].'/hooks.php');
 289 }
 290
 291 /*
 292         Uncomment the setting below when using FA on shared hosting
 293         to avoid unexpeced session timeouts.
 294         Make sure this directory exists and is writable!
 295 */
 296 // ini_set('session.save_path', dirname(__FILE__).'/../tmp/');
 297
 298 ini_set('session.gc_maxlifetime', 36000); // 10hrs
 299
 300 $Session_manager = new SessionManager();
 301 $Session_manager->sessionStart('FA'.md5(dirname(__FILE__)));
 302 //session_name('FA'.md5(dirname(__FILE__)));
 303 //session_start();
 304
 305 // this is to fix the "back-do-you-want-to-refresh" issue - thanx PHPFreaks
 306 header("Cache-control: private");
 307
 308 include_once($path_to_root . "/config.php");
 309 get_text_init();
 310
 311 // Page Initialisation
 312 if (!isset($_SESSION['language']) || !method_exists($_SESSION['language'], 'set_language'))
 313 {
 314         $l = array_search_value($dflt_lang, $installed_languages,  'code');
 315         $_SESSION['language'] = new language($l['name'], $l['code'], $l['encoding'],
 316          (isset($l['rtl']) && $l['rtl'] === true) ? 'rtl' : 'ltr');
 317 }
 318
 319 $_SESSION['language']->set_language($_SESSION['language']->code);
 320
 321
 322 include_once($path_to_root . "/includes/access_levels.inc");
 323 include_once($path_to_root . "/version.php");
 324 include_once($path_to_root . "/includes/main.inc");
 325
 326 // Ajax communication object
 327 $Ajax = new Ajax();
 328
 329 // js/php validation rules container
 330 $Validate = array();
 331 // bindings for editors
 332 $Editors = array();
 333 // page help. Currently help for function keys.
 334 $Pagehelp = array();
 335
 336 $Refs = new references();
 337
 338 // intercept all output to destroy it in case of ajax call
 339 register_shutdown_function('end_flush');
 340 ob_start('output_html',0);
 341
 342 if (!isset($_SESSION["wa_current_user"]))
 343         $_SESSION["wa_current_user"] = new current_user();
 344
 345 html_cleanup($_GET);
 346 html_cleanup($_POST);
 347 html_cleanup($_REQUEST);
 348 html_cleanup($_SERVER);
 349
 350 // logout.php is the only page we should have always
 351 // accessable regardless of access level and current login status.
 352 if (strstr($_SERVER['PHP_SELF'], 'logout.php') == false){
 353
 354         login_timeout();
 355
 356         if (!$_SESSION["wa_current_user"]->old_db)
 357                 include_once($path_to_root . '/company/'.user_company().'/installed_extensions.php');
 358
 359         install_hooks();
 360
 361         if (!$_SESSION["wa_current_user"]->logged_in())
 362         {
 363                 // Show login screen
 364                 if (!isset($_POST["user_name_entry_field"]) or $_POST["user_name_entry_field"] == "")
 365                 {
 366                         // strip ajax marker from uri, to force synchronous page reload
 367                         $_SESSION['timeout'] = array( 'uri'=>preg_replace('/JsHttpRequest=(?:(\d+)-)?([^&]+)/s',
 368                                         '', @htmlspecialchars($_SERVER['REQUEST_URI'], ENT_QUOTES, $_SESSION['language']->encoding)),
 369                                 'post' => $_POST);
 370
 371                         include($path_to_root . "/access/login.php");
 372                         if (in_ajax())
 373                                 $Ajax->activate('_page_body');
 374                         exit;
 375                 } else {
 376
 377                         $succeed = isset($db_connections[$_POST["company_login_name"]]) &&
 378                                 $_SESSION["wa_current_user"]->login($_POST["company_login_name"],
 379                                 $_POST["user_name_entry_field"], $_POST["password"]);
 380                         // select full vs fallback ui mode on login
 381                         $_SESSION["wa_current_user"]->ui_mode = $_POST['ui_mode'];
 382                         if (!$succeed)
 383                         {
 384                         // Incorrect password
 385                                 login_fail();
 386                         }
 387                         $lang = &$_SESSION['language'];
 388                         $lang->set_language($_SESSION['language']->code);
 389                 }
 390         } else
 391                 set_global_connection();
 392
 393         if (!isset($_SESSION["App"])) {
 394                 $_SESSION["App"] = new front_accounting();
 395                 $_SESSION["App"]->init();
 396         }
 397 }
 398
 399 $SysPrefs = &$_SESSION['SysPrefs'];
 400
 401 // POST vars cleanup needed for direct reuse.
 402 // We quote all values later with db_escape() before db update.
 403 $_POST = strip_quotes($_POST);
 404
 405 ?>