112 lines
2.9 KiB
PHP
112 lines
2.9 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* @copyright Copyright (c) 2017 Lukas Reschke <lukas@statuscode.ch>
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*
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* @author Lukas Reschke <lukas@statuscode.ch>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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namespace OC\Security\Normalizer;
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/**
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* Class IpAddress is used for normalizing IPv4 and IPv6 addresses in security
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* relevant contexts in Nextcloud.
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*
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* @package OC\Security\Normalizer
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*/
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class IpAddress {
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/** @var string */
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private $ip;
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/**
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* @param string $ip IP to normalized
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*/
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public function __construct(string $ip) {
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$this->ip = $ip;
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}
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/**
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* Return the given subnet for an IPv4 address and mask bits
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*
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* @param string $ip
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* @param int $maskBits
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* @return string
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*/
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private function getIPv4Subnet(string $ip, int $maskBits = 32): string {
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$binary = \inet_pton($ip);
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for ($i = 32; $i > $maskBits; $i -= 8) {
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$j = \intdiv($i, 8) - 1;
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$k = (int) \min(8, $i - $maskBits);
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$mask = (0xff - ((2 ** $k) - 1));
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$int = \unpack('C', $binary[$j]);
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$binary[$j] = \pack('C', $int[1] & $mask);
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}
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return \inet_ntop($binary).'/'.$maskBits;
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}
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/**
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* Return the given subnet for an IPv6 address and mask bits
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*
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* @param string $ip
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* @param int $maskBits
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* @return string
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*/
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private function getIPv6Subnet(string $ip, int $maskBits = 48): string {
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if ($ip[0] === '[' && $ip[-1] === ']') { // If IP is with brackets, for example [::1]
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$ip = substr($ip, 1, strlen($ip) - 2);
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}
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$binary = \inet_pton($ip);
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for ($i = 128; $i > $maskBits; $i -= 8) {
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$j = \intdiv($i, 8) - 1;
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$k = (int) \min(8, $i - $maskBits);
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$mask = (0xff - ((2 ** $k) - 1));
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$int = \unpack('C', $binary[$j]);
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$binary[$j] = \pack('C', $int[1] & $mask);
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}
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return \inet_ntop($binary).'/'.$maskBits;
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}
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/**
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* Gets either the /32 (IPv4) or the /128 (IPv6) subnet of an IP address
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*
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* @return string
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*/
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public function getSubnet(): string {
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if (\preg_match('/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/', $this->ip)) {
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return $this->getIPv4Subnet(
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$this->ip,
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32
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);
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}
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return $this->getIPv6Subnet(
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$this->ip,
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128
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);
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}
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/**
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* Returns the specified IP address
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*
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* @return string
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*/
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public function __toString(): string {
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return $this->ip;
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}
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}
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