[1575] | 1 | <?php
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| 2 | /*
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| 3 | * FCKeditor - The text editor for Internet - http://www.fckeditor.net
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| 4 | * Copyright (C) 2003-2009 Frederico Caldeira Knabben
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| 5 | *
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| 6 | * == BEGIN LICENSE ==
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| 7 | *
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| 8 | * Licensed under the terms of any of the following licenses at your
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| 9 | * choice:
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| 10 | *
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| 11 | * - GNU General Public License Version 2 or later (the "GPL")
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| 12 | * http://www.gnu.org/licenses/gpl.html
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| 13 | *
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| 14 | * - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
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| 15 | * http://www.gnu.org/licenses/lgpl.html
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| 16 | *
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| 17 | * - Mozilla Public License Version 1.1 or later (the "MPL")
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| 18 | * http://www.mozilla.org/MPL/MPL-1.1.html
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| 19 | *
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| 20 | * == END LICENSE ==
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| 21 | *
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| 22 | * Utility functions for the File Manager Connector for PHP.
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| 23 | */
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| 24 |
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| 25 | function RemoveFromStart( $sourceString, $charToRemove )
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| 26 | {
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| 27 | $sPattern = '|^' . $charToRemove . '+|' ;
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| 28 | return preg_replace( $sPattern, '', $sourceString ) ;
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| 29 | }
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| 30 |
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| 31 | function RemoveFromEnd( $sourceString, $charToRemove )
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| 32 | {
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| 33 | $sPattern = '|' . $charToRemove . '+$|' ;
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| 34 | return preg_replace( $sPattern, '', $sourceString ) ;
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| 35 | }
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| 36 |
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| 37 | function FindBadUtf8( $string )
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| 38 | {
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| 39 | $regex =
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| 40 | '([\x00-\x7F]'.
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| 41 | '|[\xC2-\xDF][\x80-\xBF]'.
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| 42 | '|\xE0[\xA0-\xBF][\x80-\xBF]'.
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| 43 | '|[\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}'.
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| 44 | '|\xED[\x80-\x9F][\x80-\xBF]'.
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| 45 | '|\xF0[\x90-\xBF][\x80-\xBF]{2}'.
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| 46 | '|[\xF1-\xF3][\x80-\xBF]{3}'.
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| 47 | '|\xF4[\x80-\x8F][\x80-\xBF]{2}'.
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| 48 | '|(.{1}))';
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| 49 |
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| 50 | while (preg_match('/'.$regex.'/S', $string, $matches)) {
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| 51 | if ( isset($matches[2])) {
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| 52 | return true;
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| 53 | }
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| 54 | $string = substr($string, strlen($matches[0]));
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| 55 | }
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| 56 |
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| 57 | return false;
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| 58 | }
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| 59 |
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| 60 | function ConvertToXmlAttribute( $value )
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| 61 | {
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| 62 | if ( defined( 'PHP_OS' ) )
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| 63 | {
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| 64 | $os = PHP_OS ;
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| 65 | }
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| 66 | else
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| 67 | {
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| 68 | $os = php_uname() ;
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| 69 | }
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| 70 |
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| 71 | if ( strtoupper( substr( $os, 0, 3 ) ) === 'WIN' || FindBadUtf8( $value ) )
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| 72 | {
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| 73 | return ( utf8_encode( htmlspecialchars( $value ) ) ) ;
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| 74 | }
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| 75 | else
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| 76 | {
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| 77 | return ( htmlspecialchars( $value ) ) ;
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| 78 | }
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| 79 | }
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| 80 |
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| 81 | /**
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| 82 | * Check whether given extension is in html etensions list
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| 83 | *
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| 84 | * @param string $ext
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| 85 | * @param array $htmlExtensions
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| 86 | * @return boolean
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| 87 | */
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| 88 | function IsHtmlExtension( $ext, $htmlExtensions )
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| 89 | {
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| 90 | if ( !$htmlExtensions || !is_array( $htmlExtensions ) )
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| 91 | {
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| 92 | return false ;
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| 93 | }
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| 94 | $lcaseHtmlExtensions = array() ;
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| 95 | foreach ( $htmlExtensions as $key => $val )
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| 96 | {
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| 97 | $lcaseHtmlExtensions[$key] = strtolower( $val ) ;
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| 98 | }
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| 99 | return in_array( $ext, $lcaseHtmlExtensions ) ;
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| 100 | }
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| 101 |
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| 102 | /**
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| 103 | * Detect HTML in the first KB to prevent against potential security issue with
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| 104 | * IE/Safari/Opera file type auto detection bug.
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| 105 | * Returns true if file contain insecure HTML code at the beginning.
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| 106 | *
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| 107 | * @param string $filePath absolute path to file
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| 108 | * @return boolean
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| 109 | */
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| 110 | function DetectHtml( $filePath )
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| 111 | {
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| 112 | $fp = @fopen( $filePath, 'rb' ) ;
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| 113 |
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| 114 | //open_basedir restriction, see #1906
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| 115 | if ( $fp === false || !flock( $fp, LOCK_SH ) )
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| 116 | {
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| 117 | return -1 ;
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| 118 | }
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| 119 |
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| 120 | $chunk = fread( $fp, 1024 ) ;
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| 121 | flock( $fp, LOCK_UN ) ;
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| 122 | fclose( $fp ) ;
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| 123 |
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| 124 | $chunk = strtolower( $chunk ) ;
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| 125 |
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| 126 | if (!$chunk)
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| 127 | {
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| 128 | return false ;
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| 129 | }
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| 130 |
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| 131 | $chunk = trim( $chunk ) ;
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| 132 |
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| 133 | if ( preg_match( "/<!DOCTYPE\W*X?HTML/sim", $chunk ) )
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| 134 | {
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| 135 | return true;
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| 136 | }
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| 137 |
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| 138 | $tags = array( '<body', '<head', '<html', '<img', '<pre', '<script', '<table', '<title' ) ;
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| 139 |
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| 140 | foreach( $tags as $tag )
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| 141 | {
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| 142 | if( false !== strpos( $chunk, $tag ) )
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| 143 | {
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| 144 | return true ;
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| 145 | }
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| 146 | }
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| 147 |
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| 148 | //type = javascript
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| 149 | if ( preg_match( '!type\s*=\s*[\'"]?\s*(?:\w*/)?(?:ecma|java)!sim', $chunk ) )
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| 150 | {
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| 151 | return true ;
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| 152 | }
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| 153 |
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| 154 | //href = javascript
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| 155 | //src = javascript
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| 156 | //data = javascript
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| 157 | if ( preg_match( '!(?:href|src|data)\s*=\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) )
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| 158 | {
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| 159 | return true ;
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| 160 | }
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| 161 |
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| 162 | //url(javascript
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| 163 | if ( preg_match( '!url\s*\(\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) )
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| 164 | {
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| 165 | return true ;
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| 166 | }
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| 167 |
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| 168 | return false ;
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| 169 | }
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| 170 |
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| 171 | /**
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| 172 | * Check file content.
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| 173 | * Currently this function validates only image files.
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| 174 | * Returns false if file is invalid.
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| 175 | *
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| 176 | * @param string $filePath absolute path to file
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| 177 | * @param string $extension file extension
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| 178 | * @param integer $detectionLevel 0 = none, 1 = use getimagesize for images, 2 = use DetectHtml for images
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| 179 | * @return boolean
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| 180 | */
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| 181 | function IsImageValid( $filePath, $extension )
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| 182 | {
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| 183 | if (!@is_readable($filePath)) {
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| 184 | return -1;
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| 185 | }
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| 186 |
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| 187 | $imageCheckExtensions = array('gif', 'jpeg', 'jpg', 'png', 'swf', 'psd', 'bmp', 'iff');
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| 188 |
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| 189 | // version_compare is available since PHP4 >= 4.0.7
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| 190 | if ( function_exists( 'version_compare' ) ) {
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| 191 | $sCurrentVersion = phpversion();
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| 192 | if ( version_compare( $sCurrentVersion, "4.2.0" ) >= 0 ) {
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| 193 | $imageCheckExtensions[] = "tiff";
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| 194 | $imageCheckExtensions[] = "tif";
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| 195 | }
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| 196 | if ( version_compare( $sCurrentVersion, "4.3.0" ) >= 0 ) {
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| 197 | $imageCheckExtensions[] = "swc";
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| 198 | }
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| 199 | if ( version_compare( $sCurrentVersion, "4.3.2" ) >= 0 ) {
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| 200 | $imageCheckExtensions[] = "jpc";
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| 201 | $imageCheckExtensions[] = "jp2";
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| 202 | $imageCheckExtensions[] = "jpx";
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| 203 | $imageCheckExtensions[] = "jb2";
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| 204 | $imageCheckExtensions[] = "xbm";
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| 205 | $imageCheckExtensions[] = "wbmp";
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| 206 | }
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| 207 | }
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| 208 |
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| 209 | if ( !in_array( $extension, $imageCheckExtensions ) ) {
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| 210 | return true;
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| 211 | }
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| 212 |
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| 213 | if ( @getimagesize( $filePath ) === false ) {
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| 214 | return false ;
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| 215 | }
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| 216 |
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| 217 | return true;
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| 218 | }
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| 219 |
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| 220 | ?>
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