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f04035caa0
Remove dead code Signed-off-by: Benjamin Gaussorgues <benjamin.gaussorgues@nextcloud.com>
109 lines
2.9 KiB
PHP
109 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 Christoph Wurst <christoph@winzerhof-wurst.at>
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* @author Konrad Bucheli <kb@open.ch>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @author Thomas Citharel <nextcloud@tcit.fr>
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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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/**
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* @param string $ip IP to normalize
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*/
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public function __construct(
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private string $ip,
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) {
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}
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/**
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* Return the given subnet for an IPv6 address (64 first bits)
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*/
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private function getIPv6Subnet(string $ip): string {
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if ($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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$pos = strpos($ip, '%'); // if there is an explicit interface added to the IP, e.g. fe80::ae2d:d1e7:fe1e:9a8d%enp2s0
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if ($pos !== false) {
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$ip = substr($ip, 0, $pos - 1);
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}
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$binary = \inet_pton($ip);
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$mask = inet_pton('FFFF:FFFF:FFFF:FFFF::');
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return inet_ntop($binary & $mask).'/64';
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}
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/**
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* Returns the IPv4 address embedded in an IPv6 if applicable.
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* The detected format is "::ffff:x.x.x.x" using the binary form.
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*
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* @return string|null embedded IPv4 string or null if none was found
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*/
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private function getEmbeddedIpv4(string $ipv6): ?string {
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$binary = inet_pton($ipv6);
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if (!$binary) {
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return null;
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}
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$mask = inet_pton('::FFFF:FFFF');
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if (($binary & ~$mask) !== inet_pton('::FFFF:0.0.0.0')) {
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return null;
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}
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return inet_ntop(substr($binary, -4));
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}
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/**
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* Gets either the /32 (IPv4) or the /64 (IPv6) subnet of an IP address
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*/
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public function getSubnet(): string {
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if (filter_var($this->ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
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return $this->ip.'/32';
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}
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$ipv4 = $this->getEmbeddedIpv4($this->ip);
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if ($ipv4 !== null) {
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return $ipv4.'/32';
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}
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return $this->getIPv6Subnet($this->ip);
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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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public function __toString(): string {
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return $this->ip;
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}
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}
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