Copy IpUtils from Symfony to avoid new dependency on backport

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

2 files changed, 203 insertions, 0 deletions

diff --git a/lib/private/Http/Client/LocalAddressChecker.php b/lib/private/Http/Client/LocalAddressChecker.php
index 14a45ce01bb..182005aac2a 100644
--- a/lib/private/Http/Client/LocalAddressChecker.php
+++ b/lib/private/Http/Client/LocalAddressChecker.php
@@ -27,6 +27,7 @@ namespace OC\Http\Client;
 
 use OCP\ILogger;
 use OCP\Http\Client\LocalServerException;
+use OC\Http\IpUtils;
 
 class LocalAddressChecker {
 	/** @var ILogger */
diff --git a/lib/private/Http/IpUtils.php b/lib/private/Http/IpUtils.php
new file mode 100644
index 00000000000..f1e8c59edb9
--- /dev/null
+++ b/lib/private/Http/IpUtils.php
@@ -0,0 +1,202 @@
+<?php
+
+/*
+ * This file comes from Symfony. Copied here to avoid backporting a new dependency.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+namespace OC\Http;
+
+/**
+ * Http utility functions.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class IpUtils
+{
+    private static $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)
+     *
+     * @return bool
+     */
+    public static function checkIp(?string $requestIp, $ips)
+    {
+        if (null === $requestIp) {
+            trigger_deprecation('symfony/http-foundation', '5.4', 'Passing null as $requestIp to "%s()" is deprecated, pass an empty string instead.', __METHOD__);
+
+            return false;
+        }
+
+        if (!\is_array($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)
+    {
+        if (null === $requestIp) {
+            trigger_deprecation('symfony/http-foundation', '5.4', 'Passing null as $requestIp to "%s()" is deprecated, pass an empty string instead.', __METHOD__);
+
+            return false;
+        }
+
+        $cacheKey = $requestIp.'-'.$ip;
+        if (isset(self::$checkedIps[$cacheKey])) {
+            return self::$checkedIps[$cacheKey];
+        }
+
+        if (!filter_var($requestIp, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4)) {
+            return self::$checkedIps[$cacheKey] = false;
+        }
+
+        if (str_contains($ip, '/')) {
+            [$address, $netmask] = explode('/', $ip, 2);
+
+            if ('0' === $netmask) {
+                return self::$checkedIps[$cacheKey] = filter_var($address, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4);
+            }
+
+            if ($netmask < 0 || $netmask > 32) {
+                return self::$checkedIps[$cacheKey] = false;
+            }
+        } else {
+            $address = $ip;
+            $netmask = 32;
+        }
+
+        if (false === ip2long($address)) {
+            return self::$checkedIps[$cacheKey] = false;
+        }
+
+        return self::$checkedIps[$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
+     *
+     * @return bool
+     *
+     * @throws \RuntimeException When IPV6 support is not enabled
+     */
+    public static function checkIp6(?string $requestIp, string $ip)
+    {
+        if (null === $requestIp) {
+            trigger_deprecation('symfony/http-foundation', '5.4', 'Passing null as $requestIp to "%s()" is deprecated, pass an empty string instead.', __METHOD__);
+
+            return false;
+        }
+
+        $cacheKey = $requestIp.'-'.$ip;
+        if (isset(self::$checkedIps[$cacheKey])) {
+            return self::$checkedIps[$cacheKey];
+        }
+
+        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".');
+        }
+
+        if (str_contains($ip, '/')) {
+            [$address, $netmask] = explode('/', $ip, 2);
+
+            if ('0' === $netmask) {
+                return (bool) unpack('n*', @inet_pton($address));
+            }
+
+            if ($netmask < 1 || $netmask > 128) {
+                return self::$checkedIps[$cacheKey] = false;
+            }
+        } else {
+            $address = $ip;
+            $netmask = 128;
+        }
+
+        $bytesAddr = unpack('n*', @inet_pton($address));
+        $bytesTest = unpack('n*', @inet_pton($requestIp));
+
+        if (!$bytesAddr || !$bytesTest) {
+            return self::$checkedIps[$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] & $mask)) {
+                return self::$checkedIps[$cacheKey] = false;
+            }
+        }
+
+        return self::$checkedIps[$cacheKey] = true;
+    }
+
+    /**
+     * Anonymizes an IP/IPv6.
+     *
+     * Removes the last byte for v4 and the last 8 bytes for v6 IPs
+     */
+    public static function anonymize(string $ip): string
+    {
+        $wrappedIPv6 = false;
+        if ('[' === substr($ip, 0, 1) && ']' === substr($ip, -1, 1)) {
+            $wrappedIPv6 = true;
+            $ip = substr($ip, 1, -1);
+        }
+
+        $packedAddress = inet_pton($ip);
+        if (4 === \strlen($packedAddress)) {
+            $mask = '255.255.255.0';
+        } elseif ($ip === inet_ntop($packedAddress & inet_pton('::ffff:ffff:ffff'))) {
+            $mask = '::ffff:ffff:ff00';
+        } elseif ($ip === inet_ntop($packedAddress & inet_pton('::ffff:ffff'))) {
+            $mask = '::ffff:ff00';
+        } else {
+            $mask = 'ffff:ffff:ffff:ffff:0000:0000:0000:0000';
+        }
+        $ip = inet_ntop($packedAddress & inet_pton($mask));
+
+        if ($wrappedIPv6) {
+            $ip = '['.$ip.']';
+        }
+
+        return $ip;
+    }
+}