anti ddos

<?php

################################################## ###########################
# #
# Cafe Contrainteleigencia PHP Website Security Script 1.8 #
# 123
# =)#

################################################## ###########################

##################
#
# ANTI DDOS,DOS and BOTNET Attacks!
#
##################

$usehtaccessbans = 1; # 1 = modify .htaccess to ban IPs, 0 = don't ban IPs.
$filterGETvars = 1; # 1 = sterilize HTML tags in GET variables, 0 = don't
$filterCOOKIEvars = 1; # 1 = sterilize HTML tags in COOKIE variables, 0 = don't
$filterPOSTvars = 0; # 1 = sterilize HTML tags in POST variables, 0 = don't
$extraPOSTprotection = 0; # 1 = use the extra POST protection, 0 = don't
$extraGETprotection = 0; # 1 = use the extra GET protection, 0 = don't (not recommended!)
$checkmultiPOST = 1; # 1 = only allow maxmultiPOST number of successive POSTs, 0 = don't care
$maxmultiPOST = 5; # Maximum number of POST operations in a row, if checkmultipost is on.
$zipcompress = 0; # 1 = Compress pages using GZIP library (lower bandwidth, higher CPU), 0 = don't
$compresslevel = 9; # Compression level for zipcompressing, from 1 (low) to 9 (maximum)
$cpuloadmonitor = 0; # 1 = block access if over a certain system load, 0 = don't
$cpumaxload = 10.0; # Maximum 5 minute system load average before blocking access
$ccisessionpath = ""; # if not blank, sets a directory path to store session files.

##### Encriptacion/En codigo de Variables

$javababble = 0; # 1 = Use Encoding/Encrypting (Must be on for any), 0 = Don't
$javaencrypt = 0; # Do actual encrypting of HTML, not just escaping (warning: may slow display)
$preservehead = 0; # 1 = Only encode/encrypt between BODY tags, 0 = encode/encrypt whole document

##################
#
# verificar para in-script overrides
#
##################

if (isset($zipoverride)) {
if (!isset($_REQUEST["zipoverride"])) {
$zipcompress = $zipoverride;
unset($zipoverride);
}
}

if (isset($babbleoverride)) {
if (!isset($_REQUEST["babbleoverride"])) {
$javababble = $babbleoverride;
unset($babbleoverride);
}
}

##################
#
# Funcion: CCIJavaBabble
#
#
##################

function CCIJavaBabble($myoutput) {
global $mycrypto, $myalpha2, $javaencrypt, $preservehead;
$s = $myoutput;
$s = ereg_replace("\n","",$s);

if ($preservehead) {
eregi("(^.+<body[^>]*>)",$s,$chunks);
$outputstring = $chunks[1];
eregi_replace($headpart,"",$s);

eregi("(</body[^>]*>.*)",$s,$chunks);
$outputend = $chunks[1];
eregi_replace($footpart,"",$s);
} else {
$outputstring = "";
$outputend = "";
}

if ($javaencrypt) {
$s = strtr($s,$myalpha2,$mycrypto);
$s = rawurlencode($s);
$outputstring .= "<script>var cc=unescape('$s'); ";
$outputstring .= "var index = document.cookie.indexOf('" . md5($_SERVER["REMOTE_ADDR"] . $_SERVER["SERVER_ADDR"]) . "='); " .
"var aa = '$myalpha2'; " .
"if (index > -1) { " .
" index = document.cookie.indexOf('=', index) + 1; " .
" var endstr = document.cookie.indexOf(';', index); " .
" if (endstr == -1) endstr = document.cookie.length; " .
" var bb = unescape(document.cookie.substring(index, endstr)); " .
"} " .
"cc = cc.replace(/[$myalpha2]/g,function(str) { return aa.substr(bb.indexOf(str),1) }); document.write(cc);";
} else {
$outputstring .= "<script>document.write(unescape('" . rawurlencode($s) . "'));";
}
$outputstring .= "</script><noscript>You must enable Javascript in order to view this webpage.</noscript>" . $outputend;

return $outputstring;
}

##################
#
# Funcion: CCIClearSession
#
# Formato: CCIClearSession()
# Retornos: Nothing
#
# Usage: Clears all the data out of the session record other than data used for this script
#
##################

function CCIClearSession() {
$getvariables = array_keys($_SESSION);
$count = 0;
while($count < count($getvariables)) {
if (substr($getvariables[$count],0,7) != "ccisec-") {
session_unregister($getvariables[$count]);
if (ini_get('register_globals')) unset($$getvariables[$count]);
}
$count++;
}
}

##################
#
# Funcion: CCIBanIP
#
# Formato: CCIBanIP(IPAddress)
# Retornos: Nothing
#
#
#
##################

function CCIBanIP($banip) {
$filelocation = ".htaccess";
$limitend = "# End of CCI Security Section\n";
$newline = "deny from $banip\n";
if (file_exists($filelocation)) {
$mybans = file($filelocation);
$lastline = "";
if (in_array($newline,$mybans)) exit();
if (in_array($limitend,$mybans)) {
$i = count($mybans)-1;
while ($mybans[$i] != $limitend) {
$lastline = array_pop($mybans) . $lastline;
$i--;
}
$lastline = array_pop($mybans) . $lastline;
$lastline = array_pop($mybans) . $lastline;
$lastline = array_pop($mybans) . $lastline;
array_push($mybans,$newline,$lastline);
} else {
array_push($mybans,"\n\n# CCI Security Script\n","<Limit GET POST>\n","order allow,deny\n",$newline,"allow from all\n","</Limit>\n",$limitend);
}
} else {
$mybans = array("# CCI Security Script\n","<Limit GET POST>\n","order allow,deny\n",$newline,"allow from all\n","</Limit>\n",$limitend);
}
$myfile = fopen($filelocation,"w");
fwrite($myfile,implode($mybans,""));
fclose($myfile);

}

##################
#
# Function: CCIFloodCheck
#
# Formato: CCIFloodCheck("identifier",interval,threshold)
#
#
##################

function CCIFloodCheck($identifier,$interval,$threshold=1) {
$myresult = 0;
if (isset($_SESSION["ccisec-" . $identifier])) {
if ($_SESSION["ccisec-" . $identifier] > (time()-$interval)) {
if ($threshold<2) {
$myresult = 1;
} else {
if (!isset($_SESSION["ccisec-" . $identifier . "-counter"])) {
$_SESSION["ccisec-" . $identifier . "-counter"] = 1;
} else {
$_SESSION["ccisec-" . $identifier . "-counter"]++;
if ($_SESSION["ccisec-" . $identifier . "-counter"] >= $threshold) {
$myresult = 1;
}
}
}
}
$_SESSION["ccisec-" . $identifier] = time();
}
return $myresult;
}

################################################## ##############################

srand(time());
if (eregi("ccisecurity\.php",$_SERVER["SCRIPT_NAME"])) exit();

if ($ccisessionpath != "") session_save_path($ccisessionpath);
session_name(md5($_SERVER["REMOTE_ADDR"] . $_SERVER["HTTP_HOST"] . "CCI"));

ini_set("session.use_only_cookies","1");
ini_set("session.use_trans_sid","0");

if (($zipcompress) && (eregi("gzip",$_SERVER["HTTP_ACCEPT_ENCODING"]))) {
ini_set("zlib.output_compression","On");
ini_set("zlib.output_compression_level",$compressl evel);
ob_start("ob_gzhandler");
}
if ($javababble) {
if ($javaencrypt) {
$myalpha = array_merge(range("a","z"),range("A","Z"),range("0 ","9"));
$myalpha2 = implode("",$myalpha);
shuffle($myalpha);
$mycrypto = implode("",$myalpha);
setcookie(md5($_SERVER["REMOTE_ADDR"] . $_SERVER["SERVER_ADDR"]),$mycrypto);
unset($myalpha);
}
ob_start("cciJavaBabble");
}

if (substr_count($_SERVER["SERVER_NAME"],".")>1) {
$cookiedomain = eregi_replace("^[^\.]+\.",".",$_SERVER["SERVER_NAME"]);
} else $cookiedomain = "." . $_SERVER["SERVER_NAME"];

$ip = $_SERVER["REMOTE_ADDR"];
$mykeyname = md5($_SERVER["REMOTE_ADDR"] . $_SERVER["HTTP_HOST"] . $_SERVER["DOCUMENT_ROOT"] . "CCI");
$myposthashname = md5($_SERVER["REMOTE_ADDR"] . $_SERVER["HTTP_HOST"] . $_SERVER["PATH"] . "CCI");

$myhash = md5($_SERVER["REMOTE_ADDR"] . $_SERVER["HTTP_USER_AGENT"] .
$_SERVER["HTTP_HOST"] . $_SERVER["DOCUMENT_ROOT"] .
$_SERVER["SERVER_SOFTWARE"] . $_SERVER["PATH"] . "X");

$mysession = md5($_SERVER["REMOTE_ADDR"] . $_SERVER["HTTP_HOST"]);
session_id($mysession);
session_start();


# Sneaky cookie-storing flooding programs tend to trip this - a cookie not meant to be returned.

if ((isset($_SESSION["ccisec-tripwire"])) && (isset($_COOKIE[$_SESSION["ccisec-tripwire"]]))) {
CCIBanIP($ip);
exit();
}
$tripwire = md5(uniqid(time()));
setcookie($tripwire,md5(uniqid(time())),time()-999999,"/",$cookiedomain);
$_SESSION["ccisec-tripwire"]=$tripwire;

# End of the tripwire routine


if (!isset($_SESSION["ccisec-errors"])) $_SESSION["ccisec-errors"] = 0;
if ($_SESSION["ccisec-errors"]>=10) {
CCIBanIP($ip);
exit();
}

if ($_SESSION["ccisec-myhash"] != $myhash) {
$_SESSION["ccisec-myhash"] = $myhash;
$_SESSION["ccisec-errors"]++;
session_write_close();
Header("Location: http://" . $_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]);
exit();
}

if ((!isset($_COOKIE[$mykeyname])) || ($_COOKIE[$mykeyname] != $myhash)) {

if (!isset($_SESSION["ccisec-nocookie"])) {
$_SESSION["ccisec-nocookie"] = 1;
} else {
$_SESSION["ccisec-nocookie"]++;
}

if (($usehtaccessbans) && ($_SESSION["ccisec-nocookie"]>10)) CCIBanIP($ip);

setcookie($mykeyname,$myhash,0,"/",$cookiedomain);

if ($_SESSION["ccisec-nocookie"]>2) {
echo "<b><h1>Access Denied</h1><br><br>You must enable cookies in order to access this website. Please do so before returning, as continued attempts to access without cookies may result in a banning of this ip ($ip).</b>";
session_write_close();
exit();
}
if ($extraGETprotection) {
$_SESSION["ccisec-hash"] = md5(uniqid(time()));
setcookie($myposthashname,$_SESSION["ccisec-hash"],0,"/",$cookiedomain);
}
CCIClearSession();
session_write_close();
Header("Location: http://" . $_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]);
exit();
} else $_SESSION["ccisec-nocookie"] = 0;

if (($usehtaccessbans) && ($_SESSION["ccisec-fastaccesses"]>40)) CCIBanIP($ip);

if ($_SESSION["ccisec-fastaccesses"]>10) {
if ((time()-60) < $_SESSION["ccisec-lastaccess"]) {
echo "<b><h1>Access Denied</h1><br><br>There have been too many rapid requests from this IP address ($ip). You must now wait a full 60 seconds before accessing this site again.</b>";
$_SESSION["ccisec-fastaccesses"]++;
$_SESSION["ccisec-lastaccess"]=time();
exit();
}
}

if (!isset($_SESSION["ccisec-lastaccess"])) {
$_SESSION["ccisec-lastaccess"]=time();
} else {
if ((time()-2) < $_SESSION["ccisec-lastaccess"]) {
if (!isset($_SESSION["ccisec-fastaccesses"])) $_SESSION["ccisec-fastaccesses"] = 0;
$_SESSION["ccisec-fastaccesses"]++;
} else {
$_SESSION["ccisec-fastaccesses"] = 0;
}
$_SESSION["ccisec-lastaccess"]=time();
}

if ($_SERVER["REQUEST_METHOD"] == "POST") {

if ($checkmultiPOST) {
if (($_SESSION["ccisec-lastoperation"] == "POST") && ($_SESSION["ccisec-opcount"] >= $maxmultiPOST)) {
echo "<b><h1>Access Denied</h1><br><br>You may not make multiple POST operations in sequence - please return to the website and try again.</b>";
$_SESSION["ccisec-errors"]++;
exit();
}
}

if ($extraPOSTprotection) {
if ((!isset($_COOKIE[$myposthashname])) || ($_COOKIE[$myposthashname] != $_SESSION["ccisec-hash"])) {
echo "<b><h1>Access Denied</h1><br><br>Your browser did not send the correct security data needed to complete a POST operation. Make sure that you have cookies enabled and then try again, or contact the administration if you feel you are receiving this message in error.</b>";
$_SESSION["ccisec-errors"]++;
exit();
}
}
} else if (($extraGETprotection) && ($_SERVER["REQUEST_METHOD"] == "GET")) {
if ((!isset($_COOKIE[$myposthashname])) || ($_COOKIE[$myposthashname] != $_SESSION["ccisec-hash"])) {
echo "<b><h1>Access Denied</h1><br><br>Your browser did not send the correct security data needed to complete a GET operation. Make sure that you have cookies enabled and then try again, or contact the administration if you feel you are receiving this message in error.</b>";
$_SESSION["ccisec-errors"]++;
exit();
}
} else if ($_SERVER["REQUEST_METHOD"] != "GET") {
exit();
}

if (($extraPOSTprotection) || ($extraGETprotection)) {
srand(time());
$_SESSION["ccisec-hash"] = md5(uniqid(time()));
setcookie($myposthashname,$_SESSION["ccisec-hash"],0,"/",$cookiedomain);
}

if ($_SESSION["ccisec-lastoperation"] == $_SERVER["REQUEST_METHOD"]) {
if (!isset($_SESSION["ccisec-opcount"])) {
$_SESSION["ccisec-opcount"] = 1;
} else {
$_SESSION["ccisec-opcount"]++;
}
} else $_SESSION["ccisec-lastoperation"] = $_SERVER["REQUEST_METHOD"];

# Make special characters safe in any GET based cgi variables.

if ($filterGETvars) {
$getvariables = array_keys($_GET);
$count = 0;
while($count < count($getvariables)) {
$_GET[$getvariables[$count]] = htmlspecialchars($_GET[$getvariables[$count]]);
if (ini_get('register_globals')) $$getvariables[$count] = $_GET[$getvariables[$count]];
$count++;
}
}

if ($filterPOSTvars) {
$getvariables = array_keys($_POST);
$count = 0;
while($count < count($getvariables)) {
$_POST[$getvariables[$count]] = htmlspecialchars($_POST[$getvariables[$count]]);
if (ini_get('register_globals')) $$getvariables[$count] = $_POST[$getvariables[$count]];
$count++;
}
}

if ($filterCOOKIEvars) {
$getvariables = array_keys($_COOKIE);
$count = 0;
while($count < count($getvariables)) {
$_COOKIE[$getvariables[$count]] = htmlspecialchars($_COOKIE[$getvariables[$count]]);
if (ini_get('register_globals')) $$getvariables[$count] = $_COOKIE[$getvariables[$count]];
$count++;
}
}

if ($cpuloadmonitor) {
$myshelldata = shell_exec("uptime");
$myshelldata = eregi_replace(".*average.*: ","",$myshelldata);
$myshelldata = eregi_replace(", .*","",$myshelldata);
if ($myshelldata >= $cpumaxload) {
echo "<b><h1>Access Denied</h1><br><br>The server is currently too busy to serve your request. We apologize for the inconvenience.</b>";
exit();
}
unset($myshelldata);
}

unset($count);
unset($getvariables);
unset($ip);
unset($cookiedomain);
unset($mykeyname);
unset($myposthashname);
unset($myhash);
unset($mysession);

$_SESSION["ccisec-errors"] = 0;
if (connection_aborted()) exit();

?>