bouffeatulm/inc/Ban.inc.php

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<?php
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// Ban system from sebsauvage
// Usage :
// * Use ban_canLogin() to check wether the user CAN login or not
// * If true, test wether password is correct or not
// * If true, call ban_loginOk()
// * Else, call ban_loginFailed()
// * Else, reject auth
define('DATA_DIR', 'data'); // Data subdirectory
define('IPBANS_FILENAME', DATA_DIR.'/ipbans.php'); // File storage for failures and bans.
define('BAN_AFTER', 5); // Ban IP after this many failures.
define('BAN_DURATION', 1800); // Ban duration for IP address after login failures (in seconds) (1800 sec. = 30 minutes)
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if (!is_dir(DATA_DIR)) { mkdir(DATA_DIR,0705); chmod(DATA_DIR,0705); }
if (!is_file(DATA_DIR.'/.htaccess')) { file_put_contents(DATA_DIR.'/.htaccess',"Allow from none\nDeny from all\n"); } // Protect data files.
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// Logging function
// ================
function logm($message)
{
$t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
file_put_contents(DATA_DIR.'/log.txt',$t,FILE_APPEND);
}
// ------------------------------------------------------------------------------------------
// Brute force protection system
// Several consecutive failed logins will ban the IP address for 30 minutes.
if (!is_file(IPBANS_FILENAME)) file_put_contents(IPBANS_FILENAME, "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>");
include IPBANS_FILENAME;
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// Signal a failed login. Will ban the IP if too many failures:
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// ============================================================
function ban_loginFailed()
{
$ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
$gb['FAILURES'][$ip]++;
if ($gb['FAILURES'][$ip]>(BAN_AFTER-1))
{
$gb['BANS'][$ip]=time()+BAN_DURATION;
logm('IP address banned from login');
}
$GLOBALS['IPBANS'] = $gb;
file_put_contents(IPBANS_FILENAME, "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
}
// Signals a successful login. Resets failed login counter.
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// ========================================================
function ban_loginOk()
{
$ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
$GLOBALS['IPBANS'] = $gb;
file_put_contents(IPBANS_FILENAME, "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
logm('Login ok.');
}
// Checks if the user CAN login. If 'true', the user can try to login.
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// ===================================================================
function ban_canLogin()
{
$ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
if (isset($gb['BANS'][$ip]))
{
// User is banned. Check if the ban has expired:
if ($gb['BANS'][$ip]<=time())
{ // Ban expired, user can try to login again.
logm('Ban lifted.');
unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
file_put_contents(IPBANS_FILENAME, "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
return true; // Ban has expired, user can login.
}
return false; // User is banned.
}
return true; // User is not banned.
}
// Returns user IP
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// ===============
function user_ip()
{
$ip = $_SERVER["REMOTE_ADDR"];
// Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
return $ip;
}