优化 加强远程下载的安全性

upload/config/config_global_default.php

@@ -163,6 +163,8 @@ $_config['security']['querysafe']['afullnote']	= 0;
 $_config['security']['creditsafe']['second'] 	= 0;		// 开启用户积分信息安全，可防止并发刷分，满足 times(次数)/second(秒) 的操作无法提交
 $_config['security']['creditsafe']['times'] 	= 10;
 
+$_config['security']['fsockopensafe']['port']	= array(80);	//fsockopen 有效的端口
+
 $_config['admincp']['founder']			= '1';		// 站点创始人：拥有站点管理后台的最高权限，每个站点可以设置 1名或多名创始人
 								// 可以使用uid，也可以使用用户名；多个创始人之间请使用逗号“,”分开;
 $_config['admincp']['forcesecques']		= 0;		// 管理人员必须设置安全提问才能进入系统设置 0=否, 1=是[安全]

upload/source/function/function_filesock.php

@@ -12,28 +12,66 @@ if(!defined('IN_DISCUZ')) {
 }
 
 function _isLocalip($ip) {
-	$iplong = ip2long($ip);	
+	$iplong = ip2long($ip);
 	return ($iplong >= 167772160 && $iplong <= 184549375) ||
 		($iplong >= 2886729728 && $iplong <= 2887778303) ||
 		($iplong >= 1681915904 && $iplong <= 1686110207) ||
-		($iplong >= 3232235520 && $iplong <= 3232301055) || 
+		($iplong >= 3232235520 && $iplong <= 3232301055) ||
 		($iplong >= 150994944 && $iplong <= 167772159);
 }
 
-function _isip($host) {
+function _parse_url($url) {
-	if(function_exists('filter_var')) {
+	global $_G;
-		return filter_var($host, FILTER_VALIDATE_IP) !== false;
+	$tmp = parse_url($url);
+	if(!$tmp || empty($tmp['host'])) return false;
+	if(isset($tmp['user']) || isset($tmp['pass'])) return false;
+	if(strpbrk($tmp['host'], ':#?[]' ) !== false) return false;
+	if(!in_array(strtolower($tmp['scheme']), array('http', 'https'))) {
+		return false;
+	}
+	$config = $_G['config']['security']['fsockopensafe'];
+
+	$ip = gethostbyname($tmp['host']);
+	if($ip == $tmp['host']) {
+		return false;
+	}
+	if(filter_var($tmp['host'], FILTER_VALIDATE_IP) && _isLocalip($tmp['host'])) {
+		return false;
+	}
+
+	if(!empty($config['port']) && isset($tmp['port'])) {
+		if(isset($_SERVER['SERVER_PORT']) && !in_array($_SERVER['SERVER_PORT'], $config['port'])) {
+			$config['port'][] = $_SERVER['SERVER_PORT'];
+		}
+		if(!in_array($tmp['port'], $config['port'])) {
+			return false;
+		}
+	}
+
+	if(!isset($tmp['port'])) {
+		$tmp['port'] = strtolower($tmp['scheme']) == 'https' ? 443 : 80;
+	}
+
+	if($ip) {
+		if(!_isLocalip($ip)) {
+			$tmp['ip'] = $ip;
+			return $tmp;
+		}
 	} else {
-		return preg_match('/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $host);
+		return $tmp;
 	}
 }
 
 function _dfsockopen($url, $limit = 0, $post = '', $cookie = '', $bysocket = FALSE, $ip = '', $timeout = 15, $block = TRUE, $encodetype  = 'URLENCODE', $allowcurl = TRUE, $position = 0, $files = array()) {
 	$return = '';
-	$matches = parse_url($url);
+	$matches = _parse_url($url);
+	if(!$matches) {
+		return '';
+	}
+	$ip = isset($matches['ip']) ? $matches['ip'] : $ip;
 	$scheme = $matches['scheme'];
 	$host = $matches['host'];
-	if(_isip($host) && _isLocalip($host) || $ip && _isLocalip($ip)) {
+	if($ip && _isLocalip($ip)) {
 		return '';
 	}
 	$path = $matches['path'] ? $matches['path'].($matches['query'] ? '?'.$matches['query'] : '') : '/';
@@ -60,7 +98,6 @@ function _dfsockopen($url, $limit = 0, $post = '', $cookie = '', $bysocket = FAL
 		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
 		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
 		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
-		curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
 		curl_setopt($ch, CURLOPT_HEADER, 1);
 		if($post) {
 			curl_setopt($ch, CURLOPT_POST, 1);