kernel.php

   1 <?php
   2 /*=====================================================================*\
   3 || ################################################################### ||
   4 || # Iris Studios Shared Object Framework [#]version[#]
   5 || # --------------------------------------------------------------- # ||
   6 || # Copyright ©2002-[#]year[#] by Iris Studios, Inc. All Rights Reserved. # ||
   7 || # This file may not be reproduced in any way without permission.  # ||
   8 || # --------------------------------------------------------------- # ||
   9 || # User License Agreement at http://www.iris-studios.com/license/  # ||
  10 || ################################################################### ||
  11 \*=====================================================================*/
  12
  13 /**
  14 * Iris Studios Shared Object Framework Kernel
  15 * kernel.php
  16 *
  17 * @package      ISSO
  18 */
  19
  20 if (!function_exists('version_compare'))
  21 {
  22         trigger_error('You need PHP version 4.1.0 or newer to run ISSO', E_USER_ERROR);
  23         exit;
  24 }
  25
  26 if (version_compare(PHP_VERSION, '5.0.0', '>='))
  27 {
  28         if (ini_get('error_reporting') & E_NOTICE)
  29         {
  30                 error_reporting(ini_get('error_reporting') - E_NOTICE);
  31         }
  32         if (ini_get('error_reporting') & E_USER_NOTICE)
  33         {
  34                 error_reporting(ini_get('error_reporting') - E_USER_NOTICE);
  35         }
  36 }
  37
  38 $oldlevel = ini_get('error_reporting');
  39 $newlevel = $oldlevel;
  40 $levels = array(E_ERROR => E_USER_ERROR, E_WARNING => E_USER_WARNING, E_NOTICE => E_USER_NOTICE);
  41 foreach ($levels AS $php => $isso)
  42 {
  43         if ($oldlevel & $php)
  44         {
  45                 if (!($oldlevel & $isso))
  46                 {
  47                         //echo "increasing newlevel by $isso; ";
  48                         $newlevel += $isso;
  49                 }
  50         }
  51         else
  52         {
  53                 if ($oldlevel & $isso)
  54                 {
  55                         //echo "decreasing newlevel by $isso; ";
  56                         $newlevel -= $isso;
  57                 }
  58         }
  59 }
  60 error_reporting($newlevel);
  61
  62 if ((bool)ini_get('register_globals') === true)
  63 {
  64         $superglobals = array('_GET', '_COOKIE', '_FILES', '_POST', '_SERVER', '_ENV');
  65         foreach ($superglobals AS $global)
  66         {
  67                 if (is_array(${$global}))
  68                 {
  69                         foreach (${$global} AS $_key => $_val)
  70                         {
  71                                 if (isset(${$_key}))
  72                                 {
  73                                         unset(${$_key});
  74                                 }
  75                         }
  76                 }
  77         }
  78 }
  79
  80 /**
  81 * Iris Studios Shared Object Framework (ISSO)
  82 *
  83 * This framework allows a common backend to be used amongst all Iris
  84 * Studios applications and is built to be abstract and flexible.
  85 * The base framework handles all loading and module management.
  86 *
  87 * @author               Iris Studios, Inc.
  88 * @copyright    Copyright ©2002 - [#]year[#], Iris Studios, Inc.
  89 * @version              $Revision$
  90 * @package              ISSO
  91 *
  92 */
  93 class Shared_Object_Framework
  94 {
  95         /**
  96         * ISSO version
  97         * @var  str
  98         */
  99         var $version = '[#]version[#]';
 100
 101         /**
 102         * Location of ISSO, used for internal linking
 103         * @var  str
 104         * @see  fetch_sourcepath(), load(), locate()
 105         */
 106         var $sourcepath = '';
 107
 108         /**
 109         * Path of the current application
 110         * @var  str
 111         */
 112         var $apppath = '';
 113
 114         /**
 115         * Name of the current application
 116         * @var  str
 117         */
 118         var $application = '';
 119
 120         /**
 121         * Version of the current application
 122         * @var  str
 123         */
 124         var $appversion = '';
 125
 126         /**
 127         * Whether debug mode is on or off
 128         * @var  bool
 129         */
 130         var $debug = false;
 131
 132         /**
 133         * List of all active debug messages
 134         * @var  array
 135         * @see  debug()
 136         */
 137         var $debuginfo = array();
 138
 139         /**
 140         * List of loaded modules
 141         * @var  array
 142         * @see  load(), show_modules()
 143         */
 144         var $modules = array();
 145
 146         /**
 147         * An array of sanitized variables that have been cleaned for HTML tag openers and double quotes
 148         * @var  array
 149         * @see  sanitize(), exec_sanitize_data()
 150         */
 151         var $in = array();
 152
 153         /**
 154         * If we are running with magic_quotes_gpc on or off
 155         * @var  int
 156         * @see  escape(), exec_sanitize_data()
 157         */
 158         var $magicquotes = 0;
 159
 160         /**
 161         * If we should automagically escape strings, mimicking magic_quotes_gpc
 162         * @var  bool
 163         * @see  exec_sanitize_data()
 164         */
 165         var $escapestrings = false;
 166
 167         /**
 168         * Constructor
 169         */
 170         function Shared_Object_Framework()
 171         {
 172                 // error reporting
 173                 set_error_handler(array(&$this, '_error_handler'));
 174
 175                 // magic quotes
 176                 $this->magicquotes = get_magic_quotes_gpc();
 177                 set_magic_quotes_runtime(0);
 178
 179                 if (defined('ISSO_ESCAPE_STRINGS'))
 180                 {
 181                         $this->escapestrings = (bool)constant('ISSO_ESCAPE_STRINGS');
 182                 }
 183
 184                 // start input sanitize using variable_order GPC
 185                 if (!$this->escapestrings)
 186                 {
 187                         $this->exec_sanitize_data();
 188                 }
 189
 190                 $this->modules['kernel'] = 'Shared Object Framework Core';
 191         }
 192
 193         /**
 194         * Prepares a path for being set as the sourcepath
 195         *
 196         * @param        str             Source path or URL
 197         *
 198         * @return       str             Prepared source path
 199         */
 200         function fetch_sourcepath($source)
 201         {
 202                 if (substr($source, strlen($source) - 1) != DIRECTORY_SEPARATOR)
 203                 {
 204                         $source .= DIRECTORY_SEPARATOR;
 205                 }
 206                 return $source;
 207         }
 208
 209         /**
 210         * Loads a framework extension
 211         *
 212         * @param        str             Name of the framework
 213         */
 214         function load($framework)
 215         {
 216                 if (!$this->is_loaded($framework))
 217                 {
 218                         $newobj = $this->locate($framework);
 219                         $this->$newobj['OBJ'] = new $newobj['CLASS']();
 220                         $GLOBALS["$newobj[OBJ]"] =& $this->$newobj['OBJ'];
 221                         $this->modules["$framework"] = $newobj['OBJECT'];
 222                 }
 223         }
 224
 225         /**
 226         * Includes a framework module. Module definitions need three variables:
 227         * class, object, and obj. Class is the name of the class, object is
 228         * the name human-readable name, and obj is the name that the module
 229         * should be initialized as; this is used in class extensions.
 230         *
 231         * @param        str             Name of the framework
 232         *
 233         * @return       array   List of initialization variables
 234         */
 235         function locate($framework)
 236         {
 237                 if ($this->sourcepath == '')
 238                 {
 239                         trigger_error('Invalid sourcepath specified', E_USER_ERROR);
 240                 }
 241
 242                 if (file_exists($this->sourcepath . $framework . '.php'))
 243                 {
 244                         require_once($this->sourcepath . $framework . '.php');
 245                         return array('CLASS' => $CLASS, 'OBJECT' => $OBJECT, 'OBJ' => $OBJ);
 246                 }
 247                 else
 248                 {
 249                         trigger_error('Could not find the framework ' . $this->sourcepath . $framework . '.php', E_USER_ERROR);
 250                         exit;
 251                 }
 252         }
 253
 254         /**
 255         * Prints a list of all currently loaded framework modules
 256         *
 257         * @param        bool            Return the data as an array?
 258         *
 259         * @return       mixed           HTML output or an array of loaded modules
 260         */
 261         function show_modules($return = false)
 262         {
 263                 if ($return)
 264                 {
 265                         return $this->modules;
 266                 }
 267                 else
 268                 {
 269                         $output = "\n\n<ul>\n\t<li>";
 270                         $output .= implode("</li>\n\t<li>", $this->modules);
 271                         $output .= "</li>\n</ul>\n\n";
 272                         $this->_message('Loaded Modules', $output, 1);
 273                 }
 274         }
 275
 276         /**
 277         * Verifies to see if a framework has been loaded
 278         *
 279         * @param        str                     Framework name
 280         *
 281         * @return       bool            Whether or not the framework has been loaded
 282         */
 283         function is_loaded($framework)
 284         {
 285                 if (isset($this->modules["$framework"]))
 286                 {
 287                         return true;
 288                 }
 289                 else
 290                 {
 291                         return false;
 292                 }
 293         }
 294
 295         /**
 296         * Prints an ISSO message
 297         *
 298         * @param        str             The title of the message
 299         * @param        str             The content of the message
 300         * @param        int             Type of message to be printed
 301         * @param        bool    Return the output?
 302         *
 303         * @return       mixed   Output or null
 304         */
 305         function _message($title, $message, $type, $return = false)
 306         {
 307                 switch ($type)
 308                 {
 309                         // Message
 310                         case 1:
 311                                 $prefix = 'Message';
 312                                 $color = '#669900';
 313                                 $font = '#000000';
 314                         break;
 315
 316                         // Warning
 317                         case 2:
 318                                 $prefix = 'Warning';
 319                                 $color = '#003399';
 320                                 $font = '#FFFFFF';
 321                         break;
 322
 323                         case 3:
 324                                 $prefix = 'Error';
 325                                 $color = '#990000';
 326                                 $font = '#EFEFEF';
 327                         break;
 328                 }
 329
 330                 $output = "\n<br />\n<table cellpadding=\"4\" cellspacing=\"1\" border=\"0\" width=\"500\" style=\"background-color: $color; color: black; font-family: Verdana, sans-serif; font-size: 12px;\">";
 331                 $output .= "\n<tr style=\"color: $font; text-align: left\">\n\t<td><strong>$prefix: $title</strong></td>\n</tr>";
 332                 $output .= "\n<tr style=\"background-color: #FFFFFF; text-align: left\">\n\t<td>$message</td>\n</tr>\n</table>\n<br />\n";
 333
 334                 if ($return)
 335                 {
 336                         return $output;
 337                 }
 338                 else
 339                 {
 340                         print($output);
 341                 }
 342         }
 343
 344         /**
 345         * Custom error handler for ISSO
 346         * We only handle E_WARNING, E_NOTICE, E_USER_ERROR, E_USER_WARNING, E_USER_NOTICE
 347         *
 348         * @param        int             Error number
 349         * @param        str             Error message string
 350         * @param        str             File that contains the error
 351         * @param        str             The line number of the error
 352         * @param        str             The active symbol table at which point the error occurred
 353         */
 354         function _error_handler($errno, $errstr, $errfile, $errline)
 355         {
 356                 switch ($errno)
 357                 {
 358                         // Fatal
 359                         case E_USER_ERROR:
 360                                 $title = 'Fatal';
 361                                 $level = 3;
 362                                 if (!(ini_get('error_reporting') & E_USER_ERROR))
 363                                 {
 364                                         return;
 365                                 }
 366                         break;
 367
 368                         // Error
 369                         case E_USER_WARNING:
 370                                 $title = 'Warning';
 371                                 $level = 2;
 372                                 if (!(ini_get('error_reporting') & E_USER_WARNING) AND !(ini_get('error_reporting') & E_WARNING))
 373                                 {
 374                                         return;
 375                                 }
 376                         break;
 377
 378                         // Warning
 379                         case E_USER_NOTICE:
 380                         default:
 381                                 $title = 'Notice';
 382                                 $level = 1;
 383                                 if (!(ini_get('error_reporting') & E_USER_NOTICE) AND !(ini_get('error_reporting') & E_NOTICE))
 384                                 {
 385                                         return;
 386                                 }
 387                         break;
 388                 }
 389
 390                 $errfile = str_replace(array(getcwd(), dirname(getcwd())), '', $errfile);
 391
 392                 $errstr .= " in <strong>$errfile</strong> on line <strong>$errline</strong>";
 393
 394                 $this->_message($title, $errstr, $level);
 395
 396                 if ($errno == E_USER_ERROR)
 397                 {
 398                         exit;
 399                 }
 400         }
 401
 402         /**
 403         * Logs a debug message for verbose output
 404         *
 405         * @param        str             Message
 406         */
 407         function debug($message)
 408         {
 409                 $this->debuginfo[] = $message;
 410         }
 411
 412         /**
 413         * Recursive XSS cleaner
 414         *
 415         * @param        mixed   Unsanitized REQUEST data
 416         *
 417         * @return       mixed   Sanitized data
 418         */
 419         function _sanitize_input_recursive($data)
 420         {
 421                 foreach ($data AS $key => $value)
 422                 {
 423                         if (is_array($value))
 424                         {
 425                                 $data["$key"] = $this->_sanitize_input_recursive($value);
 426                         }
 427                         else
 428                         {
 429                                 if ($this->escapestrings)
 430                                 {
 431                                         $data["$key"] = $this->escape($this->sanitize($value), false, false);
 432                                 }
 433                                 else
 434                                 {
 435                                         $data["$key"] = $this->sanitize($value);
 436                                 }
 437                         }
 438                 }
 439                 return $data;
 440         }
 441
 442         /**
 443         * Simple way to protect against HTML attacks with Unicode support
 444         *
 445         * @param        str             Unsanitzed text
 446         *
 447         * @return       str             Properly protected text that only encodes potential threats
 448         */
 449         function sanitize($text)
 450         {
 451                 if ($this->magicquotes)
 452                 {
 453                         return str_replace(array('<', '>', '\"', '"'), array('&lt;', '&gt;', '&quot;', '&quot;'), $text);
 454                 }
 455                 else
 456                 {
 457                         return str_replace(array('<', '>', '"'), array('&lt;', '&gt;', '&quot;'), $text);
 458                 }
 459         }
 460
 461         /**
 462         * Takes text that has been processed for HTML and unsanitizes it
 463         *
 464         * @param        str             Text that needs to be turned back into HTML
 465         * @param        bool    Force magicquotes off
 466         *
 467         * @return       str             Unsanitized text
 468         */
 469         function unsanitize($text, $force = false)
 470         {
 471                 if ($this->magicquotes AND !$force)
 472                 {
 473                         return str_replace(array('&lt;', '&gt;', '&quot;'), array('<', '>', '\"'), $text);
 474                 }
 475                 else
 476                 {
 477                         return str_replace(array('&lt;', '&gt;', '&quot;'), array('<', '>', '"'), $text);
 478                 }
 479         }
 480
 481         /**
 482         * Smart addslashes() that only applies itself it the Magic Quotes GPC is off
 483         *
 484         * @param        str             Some string
 485         * @param        bool    If the data is binary; if so it'll be run through DB::escape_string()
 486         * @param        bool    Force magic quotes to be off
 487         *
 488         * @return       str             String that has slashes added
 489         */
 490         function escape($str, $binary = false, $force = true)
 491         {
 492                 global $_isso;
 493
 494                 if ($this->magicquotes AND !$force)
 495                 {
 496                         if (isset($_isso->db) AND $binary)
 497                         {
 498                                 if (is_resource($_isso->db->link_id))
 499                                 {
 500                                         return $_isso->db->escape_string(stripslashes($str));
 501                                 }
 502                         }
 503                         return $str;
 504                 }
 505                 else
 506                 {
 507                         if (isset($_isso->db) AND $binary)
 508                         {
 509                                 if (is_resource($_isso->db->link_id))
 510                                 {
 511                                         return $_isso->db->escape_string($str);
 512                                 }
 513                         }
 514                         return addslashes($str);
 515                 }
 516         }
 517
 518         /**
 519         * Runs through all of the input data and sanitizes it.
 520         */
 521         function exec_sanitize_data()
 522         {
 523                 $this->in = $this->_sanitize_input_recursive(array_merge($_GET, $_POST, $_COOKIE));
 524                 // we're now using magic quotes
 525                 if ($this->escapestrings)
 526                 {
 527                         $this->magicquotes = 1;
 528                 }
 529         }
 530 }
 531
 532 /**
 533 * Global callback used for module calls back to the kernel
 534 */
 535 $_isso = new Shared_Object_Framework();
 536
 537 /**
 538 * Wrapper for ternary operator that has to be in the global scope.
 539 * This function is going to be removed from our applications due
 540 * to it's latency in processing. This will remain here purely
 541 * for legacy reasons. It will be removed when necessary.
 542 *
 543 * @deprecated   The normal ternary operators should be used instead; function calls are too expensive
 544 *
 545 * @param        expr    Expression
 546 * @param        mixed   If the expression is true
 547 * @param        mixed   If the expression is false
 548 *
 549 * @return       mixed   True or false data
 550 */
 551 function iff($condition, $iftrue, $iffalse = null)
 552 {
 553         return ($condition) ? ($iftrue) : ($iffalse);
 554 }
 555
 556 if (defined('ISSO_CHECK_POST_REFERER'))
 557 {
 558         if ($_SERVER['REQUEST_METHOD'] == 'POST')
 559         {
 560                 $host = ($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : $_ENV['HTTP_HOST'];
 561
 562                 if ($host AND $_SERVER['HTTP_REFERER'])
 563                 {
 564                         $parts = parse_url($_SERVER['HTTP_REFERER']);
 565                         $ourhost = $parts['host'] . (($parts['port']) ? ":$parts[port]" : '');
 566
 567                         if ($ourhost != $host)
 568                         {
 569                                 trigger_error('No external hosts are allowed to POST to this application', E_USER_ERROR);
 570                         }
 571                         $_isso->debug('remote post check = ok');
 572                 }
 573                 else
 574                 {
 575                         $_isso->debug('remote post check = FAILED');
 576                 }
 577         }
 578 }
 579
 580 /*=====================================================================*\
 581 || ###################################################################
 582 || # $HeadURL$
 583 || # $Id$
 584 || ###################################################################
 585 \*=====================================================================*/
 586 ?>