REMOTE_ADDR:是和服务器直接"握手"的IP。
HTTP_CLIENT_IP:代理服务器添加的 HTTP 头,存放客户端真实IP。
HTTP_X_FORWARDED_FOR:代理服务器添加的HTTP头,存放真实ip和各级代理ip。格式为X-Forwarded-For: client1, proxy1, proxy2。
http请求头可以伪造,不仅代理可以,客户端也可以。
REMOTE_ADDR也可以伪造,通过伪造tcp握手包,Response将会发送给被伪造的IP,所以这个层面的伪造ip没有意义。
phpcms中的获取ip函数:
function ip() { if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) { $ip = getenv('HTTP_CLIENT_IP'); } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) { $ip = getenv('HTTP_X_FORWARDED_FOR'); } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) { $ip = getenv('REMOTE_ADDR'); } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) { $ip = $_SERVER['REMOTE_ADDR']; } return preg_match ( '/[\d\.]{7,15}/', $ip, $matches ) ? $matches [0] : ''; }
它首先取 HTTP_CLIENT_IP ,然后取 HTTP_X_FORWARDED_FOR,上述都取不到的情况下才去取 REMOTE_ADDR。可前两个都能在客户端伪造。所以这个次序不行。
来看一看如何伪造。
ip_request.php:
<?php $headers['CLIENT-IP'] = '2.2.2.2'; $headers['X-FORWARDED-FOR'] = '3.3.3.3,8.8.8.8'; $headerArr = array(); foreach( $headers as $n => $v ) { $headerArr[] = $n .':' . $v; } ob_start(); $ch = curl_init(); curl_setopt ($ch, CURLOPT_URL, "http://www.my.com/ip_response.php"); curl_setopt ($ch, CURLOPT_HTTPHEADER , $headerArr ); //构造IP curl_setopt ($ch, CURLOPT_REFERER, "http://www.163.com/ "); //构造来路 curl_setopt( $ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_POST, 1);//post方式发送数据 curl_exec($ch); curl_close ($ch); $out = ob_get_contents(); ob_clean(); echo $out; ?>
ip_response.php
<?php print_r($_SERVER); ?>
输出结果:
HTTP/1.1 200 OK Date: Wed, 08 Mar 2017 02:57:08 GMT Server: Apache/2.4.9 (Win32) PHP/5.5.12 X-Powered-By: PHP/5.5.12 Content-Length: 2028 Connection: close Content-Type: text/html Array ( [HTTP_HOST] => www.my.com [HTTP_ACCEPT] => */* [HTTP_REFERER] => http://www.163.com/ [HTTP_CLIENT_IP] => 2.2.2.2 [HTTP_X_FORWARDED_FOR] => 3.3.3.3,8.8.8.8 [CONTENT_TYPE] => application/x-www-form-urlencoded [HTTP_EXPECT] => 100-continue [PATH] => C:\Program Files\Java\jdk1.8.0_31\bin;C:\Program Files\Java\jdk1.8.0_31\jre\bin;C:\Program Files\Java\jdk1.8.0_31\bin;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files\Java\bin;C:\Program Files (x86)\MacType;F:\Program Files\TortoiseSVN\bin;C:\Python27\;C:\Program Files\nodejs\;C:\WINDOWS\system32\config\systemprofile\.dnx\bin;C:\Program Files\Microsoft DNX\Dnvm\;C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit\;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;E:\WAMP\bin\php\php5.5.12;C:\WINDOWS\system32\config\systemprofile\AppData\Local\Microsoft\WindowsApps [SystemRoot] => C:\WINDOWS [COMSPEC] => C:\WINDOWS\system32\cmd.exe [PATHEXT] => .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC [WINDIR] => C:\WINDOWS [SERVER_SIGNATURE] => <address>Apache/2.4.9 (Win32) PHP/5.5.12 Server at www.my.com Port 80</address> [SERVER_SOFTWARE] => Apache/2.4.9 (Win32) PHP/5.5.12 [SERVER_NAME] => www.my.com [SERVER_ADDR] => 127.0.0.1 [SERVER_PORT] => 80 [REMOTE_ADDR] => 127.0.0.1 [DOCUMENT_ROOT] => E:/WAMP/www/my [REQUEST_SCHEME] => http [CONTEXT_PREFIX] => [CONTEXT_DOCUMENT_ROOT] => E:/WAMP/www/my [SERVER_ADMIN] => admin@example.com [SCRIPT_FILENAME] => E:/WAMP/www/my/ip_response.php [REMOTE_PORT] => 59461 [GATEWAY_INTERFACE] => CGI/1.1 [SERVER_PROTOCOL] => HTTP/1.1 [REQUEST_METHOD] => POST [QUERY_STRING] => [REQUEST_URI] => /ip_response.php [SCRIPT_NAME] => /ip_response.php [PHP_SELF] => /ip_response.php [REQUEST_TIME_FLOAT] => 1488941828.317 [REQUEST_TIME] => 1488941828 )
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