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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\HttpFoundation;
/**
* Http utility functions.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class IpUtils
{
public const PRIVATE_SUBNETS = [
'127.0.0.0/8', // RFC1700 (Loopback)
'10.0.0.0/8', // RFC1918
'192.168.0.0/16', // RFC1918
'172.16.0.0/12', // RFC1918
'169.254.0.0/16', // RFC3927
'0.0.0.0/8', // RFC5735
'240.0.0.0/4', // RFC1112
'100.64.0.0/10', // RFC6598
'::1/128', // Loopback
'fc00::/7', // Unique Local Address
'fe80::/10', // Link Local Address
'::ffff:0:0/96', // IPv4-mapped IPv6 addresses (RFC 4291 section 2.5.5.2)
'::/128', // Unspecified address
'::/96', // IPv4-compatible IPv6 addresses (RFC 4291 section 2.5.5.1)
'2002::/16', // 6to4 (RFC 3056)
'2001::/32', // Teredo tunneling (RFC 4380)
'64:ff9b::/96', // NAT64 well-known prefix (RFC 6052)
'64:ff9b:1::/48', // NAT64 local-use prefix (RFC 8215)
];
private static array $checkedIps = [];
/**
* This class should not be instantiated.
*/
private function __construct()
{
}
/**
* Checks if an IPv4 or IPv6 address is contained in the list of given IPs or subnets.
*
* @param string|array $ips List of IPs or subnets (can be a string if only a single one)
*/
public static function checkIp(string $requestIp, string|array $ips): bool
{
if (!\is_array($ips)) {
$ips = [$ips];
}
$method = substr_count($requestIp, ':') > 1 ? 'checkIp6' : 'checkIp4';
foreach ($ips as $ip) {
if (self::$method($requestIp, $ip)) {
return true;
}
}
return false;
}
/**
* Compares two IPv4 addresses.
* In case a subnet is given, it checks if it contains the request IP.
*
* @param string $ip IPv4 address or subnet in CIDR notation
*
* @return bool Whether the request IP matches the IP, or whether the request IP is within the CIDR subnet
*/
public static function checkIp4(string $requestIp, string $ip): bool
{
$cacheKey = $requestIp.'-'.$ip.'-v4';
if (null !== $cacheValue = self::getCacheResult($cacheKey)) {
return $cacheValue;
}
if (!filter_var($requestIp, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4)) {
return self::setCacheResult($cacheKey, false);
}
if (str_contains($ip, '/')) {
[$address, $netmask] = explode('/', $ip, 2);
if ('0' === $netmask) {
return self::setCacheResult($cacheKey, false !== filter_var($address, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4));
}
if ($netmask < 0 || $netmask > 32) {
return self::setCacheResult($cacheKey, false);
}
} else {
$address = $ip;
$netmask = 32;
}
if (false === ip2long($address)) {
return self::setCacheResult($cacheKey, false);
}
return self::setCacheResult($cacheKey, 0 === substr_compare(\sprintf('%032b', ip2long($requestIp)), \sprintf('%032b', ip2long($address)), 0, $netmask));
}
/**
* Compares two IPv6 addresses.
* In case a subnet is given, it checks if it contains the request IP.
*
* @author David Soria Parra <dsp at php dot net>
*
* @see https://github.com/dsp/v6tools
*
* @param string $ip IPv6 address or subnet in CIDR notation
*
* @throws \RuntimeException When IPV6 support is not enabled
*/
public static function checkIp6(string $requestIp, string $ip): bool
{
$cacheKey = $requestIp.'-'.$ip.'-v6';
if (null !== $cacheValue = self::getCacheResult($cacheKey)) {
return $cacheValue;
}
if (!((\extension_loaded('sockets') && \defined('AF_INET6')) || @inet_pton('::1'))) {
throw new \RuntimeException('Unable to check Ipv6. Check that PHP was not compiled with option "disable-ipv6".');
}
// Check to see if we were given a IP4 $requestIp or $ip by mistake
if (!filter_var($requestIp, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV6)) {
return self::setCacheResult($cacheKey, false);
}
if (str_contains($ip, '/')) {
[$address, $netmask] = explode('/', $ip, 2);
if (!filter_var($address, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV6)) {
return self::setCacheResult($cacheKey, false);
}
if ('0' === $netmask) {
return (bool) unpack('n*', @inet_pton($address));
}
if ($netmask < 1 || $netmask > 128) {
return self::setCacheResult($cacheKey, false);
}
} else {
if (!filter_var($ip, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV6)) {
return self::setCacheResult($cacheKey, false);
}
$address = $ip;
$netmask = 128;
}
$bytesAddr = unpack('n*', @inet_pton($address));
$bytesTest = unpack('n*', @inet_pton($requestIp));
if (!$bytesAddr || !$bytesTest) {
return self::setCacheResult($cacheKey, false);
}
for ($i = 1, $ceil = ceil($netmask / 16); $i <= $ceil; ++$i) {
$left = $netmask - 16 * ($i - 1);
$left = ($left <= 16) ? $left : 16;
$mask = ~(0xFFFF >> $left) & 0xFFFF;
if (($bytesAddr[$i] & $mask) != ($bytesTest[$i] & $mask)) {
return self::setCacheResult($cacheKey, false);
}
}
return self::setCacheResult($cacheKey, true);
}
/**
* Anonymizes an IP/IPv6.
*
* Removes the last bytes of IPv4 and IPv6 addresses (1 byte for IPv4 and 8 bytes for IPv6 by default).
*
* @param int<0, 4> $v4Bytes
* @param int<0, 16> $v6Bytes
*/
public static function anonymize(string $ip/* , int $v4Bytes = 1, int $v6Bytes = 8 */): string
{
$v4Bytes = 1 < \func_num_args() ? func_get_arg(1) : 1;
$v6Bytes = 2 < \func_num_args() ? func_get_arg(2) : 8;
if ($v4Bytes < 0 || $v6Bytes < 0) {
throw new \InvalidArgumentException('Cannot anonymize less than 0 bytes.');
}
if ($v4Bytes > 4 || $v6Bytes > 16) {
throw new \InvalidArgumentException('Cannot anonymize more than 4 bytes for IPv4 and 16 bytes for IPv6.');
}
/*
* If the IP contains a % symbol, then it is a local-link address with scoping according to RFC 4007
* In that case, we only care about the part before the % symbol, as the following functions, can only work with
* the IP address itself. As the scope can leak information (containing interface name), we do not want to
* include it in our anonymized IP data.
*/
if (str_contains($ip, '%')) {
$ip = substr($ip, 0, strpos($ip, '%'));
}
$wrappedIPv6 = false;
if (str_starts_with($ip, '[') && str_ends_with($ip, ']')) {
$wrappedIPv6 = true;
$ip = substr($ip, 1, -1);
}
$mappedIpV4MaskGenerator = static function (string $mask, int $bytesToAnonymize) {
$mask .= str_repeat('ff', 4 - $bytesToAnonymize);
$mask .= str_repeat('00', $bytesToAnonymize);
return '::'.implode(':', str_split($mask, 4));
};
$packedAddress = inet_pton($ip);
if (4 === \strlen($packedAddress)) {
$mask = rtrim(str_repeat('255.', 4 - $v4Bytes).str_repeat('0.', $v4Bytes), '.');
} elseif ($ip === inet_ntop($packedAddress & inet_pton('::ffff:ffff:ffff'))) {
$mask = $mappedIpV4MaskGenerator('ffff', $v4Bytes);
} elseif ($ip === inet_ntop($packedAddress & inet_pton('::ffff:ffff'))) {
$mask = $mappedIpV4MaskGenerator('', $v4Bytes);
} else {
$mask = str_repeat('ff', 16 - $v6Bytes).str_repeat('00', $v6Bytes);
$mask = implode(':', str_split($mask, 4));
}
$ip = inet_ntop($packedAddress & inet_pton($mask));
if ($wrappedIPv6) {
$ip = '['.$ip.']';
}
return $ip;
}
/**
* Checks if an IPv4 or IPv6 address is contained in the list of private IP subnets.
*/
public static function isPrivateIp(string $requestIp): bool
{
return self::checkIp($requestIp, self::PRIVATE_SUBNETS);
}
private static function getCacheResult(string $cacheKey): ?bool
{
if (isset(self::$checkedIps[$cacheKey])) {
// Move the item last in cache (LRU)
$value = self::$checkedIps[$cacheKey];
unset(self::$checkedIps[$cacheKey]);
self::$checkedIps[$cacheKey] = $value;
return self::$checkedIps[$cacheKey];
}
return null;
}
private static function setCacheResult(string $cacheKey, bool $result): bool
{
if (1000 < \count(self::$checkedIps)) {
// stop memory leak if there are many keys
self::$checkedIps = \array_slice(self::$checkedIps, 500, null, true);
}
return self::$checkedIps[$cacheKey] = $result;
}
}