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<?php
declare(strict_types=1);
namespace SimpleSAML\Utils;
/**
* Net-related utility methods.
*
* @package SimpleSAMLphp
*/
class Net
{
/**
* Check whether an IP address is part of a CIDR.
*
* @param string $cidr The network CIDR address.
* @param string $ip The IP address to check. Optional. Current remote address will be used if none specified. Do
* not rely on default parameter if running behind load balancers.
*
* @return boolean True if the IP address belongs to the specified CIDR, false otherwise.
*
* @author Andreas Åkre Solberg, UNINETT AS <andreas.solberg@uninett.no>
* @author Olav Morken, UNINETT AS <olav.morken@uninett.no>
* @author Brook Schofield, GÉANT
* @author Jaime Perez, UNINETT AS <jaime.perez@uninett.no>
*/
public static function ipCIDRcheck($cidr, $ip = null)
{
if ($ip === null) {
$ip = $_SERVER['REMOTE_ADDR'];
}
if (strpos($cidr, '/') === false) {
return false;
}
list ($net, $mask) = explode('/', $cidr);
$mask = intval($mask);
$ip_ip = [];
$ip_net = [];
if (strstr($ip, ':') || strstr($net, ':')) {
// Validate IPv6 with inet_pton, convert to hex with bin2hex
// then store as a long with hexdec
$ip_pack = @inet_pton($ip);
$net_pack = @inet_pton($net);
if ($ip_pack === false || $net_pack === false) {
// not valid IPv6 address (warning silenced)
return false;
}
$ip_ip = str_split(bin2hex($ip_pack), 8);
foreach ($ip_ip as &$value) {
$value = hexdec($value);
}
$ip_net = str_split(bin2hex($net_pack), 8);
foreach ($ip_net as &$value) {
$value = hexdec($value);
}
} else {
$ip_ip[0] = ip2long($ip);
$ip_net[0] = ip2long($net);
}
for ($i = 0; $mask > 0 && $i < sizeof($ip_ip); $i++) {
if ($mask > 32) {
$iteration_mask = 32;
} else {
$iteration_mask = $mask;
}
$mask -= 32;
$ip_mask = ~((1 << (32 - $iteration_mask)) - 1);
$ip_net_mask = intval($ip_net[$i]) & $ip_mask;
$ip_ip_mask = intval($ip_ip[$i]) & $ip_mask;
if ($ip_ip_mask != $ip_net_mask) {
return false;
}
}
return true;
}
}
|
