X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=inc%2Flibs%2Fsecurity_functions.php;h=10002eea7120000cc4ee52f429653b2919b17459;hb=4418d7cfabd34a285cc5ff3638e3ba05d8afd16b;hp=3922624fb74e17b664c87d5b6a37a311a4f80a0a;hpb=64c8349613addc3da2242c5cd6b99d64e3fb5f8e;p=mailer.git

diff --git a/inc/libs/security_functions.php b/inc/libs/security_functions.php
index 3922624fb7..10002eea71 100644
--- a/inc/libs/security_functions.php
+++ b/inc/libs/security_functions.php
@@ -1,7 +1,7 @@
 <?php
 /************************************************************************
- * MXChange v0.2.1                                    Start: 09/20/2005 *
- * ===============                              Last change: 09/20/2005 *
+ * Mailer v0.2.1-FINAL                                Start: 09/20/2005 *
+ * ===================                          Last change: 09/20/2005 *
  *                                                                      *
  * -------------------------------------------------------------------- *
  * File              : security_functions.php                           *
@@ -14,11 +14,10 @@
  * $Date::                                                            $ *
  * $Tag:: 0.2.1-FINAL                                                 $ *
  * $Author::                                                          $ *
- * Needs to be in all Files and every File needs "svn propset           *
- * svn:keywords Date Revision" (autoprobset!) at least!!!!!!            *
  * -------------------------------------------------------------------- *
  * Copyright (c) 2003 - 2009 by Roland Haeder                           *
- * For more information visit: http://www.mxchange.org                  *
+ * Copyright (c) 2009 - 2012 by Mailer Developer Team                   *
+ * For more information visit: http://mxchange.org                      *
  *                                                                      *
  * This program is free software; you can redistribute it and/or modify *
  * it under the terms of the GNU General Public License as published by *
@@ -36,64 +35,155 @@
  * MA  02110-1301  USA                                                  *
  ************************************************************************/
 
-// Run only once this security check/exchange
-if (defined('__SECURITY')) return;
+// Run only once this security check/replacement
+if (defined('__SECURITY')) {
+	return;
+} // END - if
 
 // Some security stuff...
-if (ereg(basename(__FILE__), $_SERVER['PHP_SELF'])) {
+if (strpos($_SERVER['PHP_SELF'], basename(__FILE__)) !== FALSE) {
 	die();
 } // END - if
 
+// Include ctracker, recommended place!
+//require_once('ctracker.php');
+//require_once('ipfilter.php');
+
 /**
  * Function to secure input strings
  *
- * @param	$str	The unsecured string
- * @param	$strip	Strip tags
- * @return	$str	A (hopefully) secured string against XSS and other bad things
+ * @param	$str		The unsecured string
+ * @param	$stripTags	Strip tags
+ * @return	$str		A (hopefully) secured string against XSS and other bad things
  */
-function secureString ($str, $strip=true) {
+function secureString ($str, $stripTags = TRUE, $encode = FALSE) {
 	// Shall we strip HTML code?
-	if ($strip === true) $str = strip_tags($str);
+	if ($stripTags === TRUE) {
+		$str = strip_tags($str);
+	} // END - if
 
 	// Trim string
 	$str = trim($str);
 
-	// Encode in entities
-	$str = htmlentities($str, ENT_QUOTES);
+	// Encode in entities if requested
+	if ($encode === TRUE) {
+		// Encode in entities (this breakes UTF-8!)
+		$str = htmlentities($str, ENT_QUOTES);
+	} // END - if
+
+	// Replace {,} with entities
+	$str = str_replace(array('{', '}'), array('&#123;', '&#125;'), $str);
+
+	// Return result
 	return $str;
 }
 
+/**
+ * Secures $_SERVER['PHP_SELF'] against attacks
+ *
+ * @return	void
+ */
+function securePhpSelf () {
+	// Did it run before?
+	if (isset($GLOBALS['php_self_secured'])) {
+		// Please do not call this twice!
+		die('PHP_SELF is already secured. Please do not call ' . __FUNCTION__ . ' for your self.');
+	} // END - if
+
+	// Secure the string
+	$_SERVER['PHP_SELF'] = secureString($_SERVER['PHP_SELF']);
+
+	// Split it up into path and filename
+	$phpSelfDirectory = dirname($_SERVER['PHP_SELF']);
+	$phpSelfFile      = basename($_SERVER['PHP_SELF']);
+
+	// Check for a .php inside the $phpSelfDirectory...
+	while (strpos($phpSelfDirectory, '.php') !== FALSE) {
+		// Correct the dirname
+		$phpSelfDirectory = substr($phpSelfDirectory, 0, (strpos($phpSelfDirectory, '.php') + 4));
+		// Rewrite filename...
+		$phpSelfFile = basename($phpSelfDirectory);
+		// ... and dirname
+		$phpSelfDirectory = dirname($phpSelfDirectory);
+	} // END - while
+
+	// Put both together again and let's pray it is secured now...
+	$_SERVER['PHP_SELF'] = $phpSelfDirectory . '/' . $phpSelfFile;
+
+	// Did run...
+	$GLOBALS['php_self_secured'] = TRUE;
+
+	// Remove uneccessary variables
+	unset($phpSelfDirectory);
+	unset($phpSelfFile);
+}
+
+/**
+ * Checks if PHP_VERSION is newer or equal to given version string
+ *
+ * @param	$versionString	A PHP'ized version string which shall be compared with PHP_VERSION
+ * @return	$isEqualNewer	Wether the given version string is equal or newer to PHP_VERSION
+ */
+function isPhpVersionEqualNewer ($versionString) {
+	return (version_compare(PHP_VERSION, $versionString, '>='));
+}
+
+/**
+ * Detects caching in PHP
+ *
+ * @return	void
+ */
+function detectPhpCaching () {
+	// Activate caching or transparent compressing when it is not already done
+	if ((isPhpVersionEqualNewer('4.0.4pl1')) && (strstr(getenv('HTTP_USER_AGENT'),'compatible') || (strstr(getenv('HTTP_USER_AGENT'), 'Mozilla')))) {
+		if ((extension_loaded('zlib')) && (function_exists('ob_start'))) {
+			// Start caching
+			$GLOBALS['php_caching'] = 'on';
+			ob_start();
+		} else {
+			// Extension not loaded or required function is missing
+			$GLOBALS['php_caching'] = '404';
+		}
+	} else {
+		// Old PHP version
+		$GLOBALS['php_caching'] = 'old';
+	}
+}
+
 // Runtime/GPC quoting is off now...
-set_magic_quotes_runtime(false);
-ini_set('magic_quotes_gpc', false); // This may not work on some systems
+ini_set('magic_quotes_runtime', FALSE);
+ini_set('magic_quotes_gpc', FALSE); // This may not work on some systems
+
+/*
+ * No compatibility with Zend Engine 1, else an error like 'Implicit cloning'
+ * will be produced.
+ */
+if (isPhpVersionEqualNewer('5.0')) {
+	ini_set('zend.ze1_compatibility_mode', 'Off');
+} // END - if
 
 // Check if important arrays are found and define them if missing
 if (!isset($_SERVER)) {
 	global $_SERVER;
 	$_SERVER = $GLOBALS['_SERVER'];
-}
+} // END - if
 
 if (!isset($_GET)) {
 	global $_GET;
 	$_GET = $GLOBALS['_GET'];
-}
+} // END - if
 
 if (!isset($_POST)) {
 	global $_POST;
 	$_POST = $GLOBALS['_POST'];
-}
-
-// Include IP-Filter here
-//require("/usr/share/php/ipfilter.php");
+} // END - if
 
 // Generate arrays which holds the relevante chars to replace
 $GLOBALS['security_chars'] = array(
 	// The chars we are looking for...
-	'from' => array('{', '}', '/', '.', "'", "$", '(', ')', '{--', '--}', '{?', '?}', '%', ';', '[', ']', ':', '--'),
+	'from' => array('/', '.', chr(39), '$', '(', ')', '{--', '--}', '{?', '?}', '%', ';', '[', ']', ':', '--', chr(92), chr(39), '<', '>'),
 	// ... and we will replace to.
 	'to'   => array(
-		'{OPEN_ANCHOR2}',
-		'{CLOSE_ANCHOR2}',
 		'{SLASH}',
 		'{DOT}',
 		'{QUOT}',
@@ -109,14 +199,20 @@ $GLOBALS['security_chars'] = array(
 		'{OPEN_INDEX}',
 		'{CLOSE_INDEX}',
 		'{DBL_DOT}',
-		'{COMMENT}'
+		'{COMMENT}',
+		'{BACKSLASH}',
+		'{SQUOTE}',
+		'{OPEN_TAG}',
+		'{CLOSE_TAG}'
 	),
 );
 
-// Characters allowed in URLs
-//
-// Note: Do not replace 'to' with 'from' and vise-versa! When you do this all booked URLs will be
-//       rejected because of the {SLASH}, {DOT} and all below listed items inside the URL.
+/*
+ * Characters allowed in booked URLs
+ *
+ * Note: Do not replace 'to' with 'from' and vise-versa! When you do this all booked URLs will be
+ *       rejected because of the {SLASH}, {DOT} and all below listed items inside the URL.
+ */
 $GLOBALS['url_chars'] = array(
 	// Search for these secured characters
 	'to'   => array('{SLASH}', '{DOT}', '{PER}', '{DBL_DOT}', '{COMMENT}'),
@@ -132,10 +228,7 @@ if (is_array($_GET)) {
 			unset($_GET[$seckey]);
 		} else {
 			// Only variables are allowed (non-array) but we secure them all!
-			foreach ($GLOBALS['security_chars']['from'] as $key => $char) {
-				// Pass all through
-				$_GET[$seckey] = str_replace($char  , $GLOBALS['security_chars']['to'][$key], $_GET[$seckey]);
-			} // END - foreach
+			$_GET[$seckey] = str_replace($GLOBALS['security_chars']['from'], $GLOBALS['security_chars']['to'], $_GET[$seckey]);
 
 			// Strip all other out
 			$_GET[$seckey] = secureString($_GET[$seckey]);
@@ -143,47 +236,26 @@ if (is_array($_GET)) {
 	} // END - foreach
 } // END - if
 
-// Activate caching or transparent compressing when it is not already done
-if (phpversion() >= '4.0.4pl1' && (strstr(getenv('HTTP_USER_AGENT'),'compatible') || (strstr(getenv('HTTP_USER_AGENT'), 'Mozilla')))) {
-	if ((extension_loaded('zlib')) && (function_exists('ob_start'))) {
-		// Start caching
-		$GLOBALS['php_caching'] = 'on';
-		ob_start();
-	} else {
-		// Extension not loaded or required function is missing
-		$GLOBALS['php_caching'] = '404';
-	}
-} else {
-	// Old PHP version
-	$GLOBALS['php_caching'] = 'old';
-}
-
-// At last secure the $_SERVER['PHP_SELF'] element
-$_SERVER['PHP_SELF'] = secureString($_SERVER['PHP_SELF']);
-
-// Split it up into path and filename
-$SELF_DIR  = dirname($_SERVER['PHP_SELF']);
-$SELF_FILE = basename($_SERVER['PHP_SELF']);
-
-// Check for a .php inside the $SELF_DIR...
-while (ereg('.php', $SELF_DIR)) {
-	// Correct the dirname
-	$SELF_DIR = substr($SELF_DIR, 0, (strpos($SELF_DIR, '.php') + 4));
-	// Rewrite filename...
-	$SELF_FILE = basename($SELF_DIR);
-	// ... and dirname
-	$SELF_DIR = dirname($SELF_DIR);
-} // END - while
+// Secure also $_POST data (only simple, no replace)
+if (is_array($_POST)) {
+	// Secure only simple data
+	foreach ($_POST as $seckey => $secvalue) {
+		// Is it an array?
+		if (!is_array($secvalue)) {
+			// Strip all other out
+			$_POST[$seckey] = secureString($_POST[$seckey]);
+		} // END - if
+	} // END - foreach
+} // END - if
 
-// Put both together again and let's pray it is secured now...
-$_SERVER['PHP_SELF'] = $SELF_DIR . '/' . $SELF_FILE;
+// Detect PHP caching
+detectPhpCaching();
 
-// Remove uneccessary variables
-unset($SELF_DIR);
-unset($SELF_FILE);
+// At last secure the $_SERVER['PHP_SELF'] element
+securePhpSelf();
 
 // Security system loaded...
-define('__SECURITY', '1');
+define('__SECURITY', 1);
 
 // [EOF]
 ?>