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[stable23] Improve local IP detection #33354

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Merged
blizzz merged 8 commits into from
Aug 3, 2022
Merged

[stable23] Improve local IP detection #33354

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342934e
Improve local IP detection
come-nc Jun 27, 2022
8ad9a15
Refactor local IP if and set strict to true for in_array
come-nc Jun 28, 2022
a04cb4d
Check for local IPs nested in IPv6 as well
come-nc Jun 28, 2022
91a244e
Use Symfony IpUtils to check for local IP ranges
come-nc Jul 12, 2022
28dd116
Copy IpUtils from Symfony to avoid new dependency on backport
come-nc Aug 1, 2022
f41425c
Align copied file with our code style
come-nc Aug 1, 2022
4664375
Remove call to undefined function, fix typing
come-nc Aug 1, 2022
125a60c
Fix autoloader
come-nc Aug 1, 2022
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Improve local IP detection 
Signed-off-by: Côme Chilliet <[email protected]>
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@come-nc @backportbot-nextcloud
come-nc authored and backportbot-nextcloud[bot] committed Jul 26, 2022
commit 342934e9c230060ef8e9712bcb27b5047f9e3d62
6 changes: 6 additions & 0 deletions lib/private/Http/Client/LocalAddressChecker.php
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,12 @@ public function ThrowIfLocalIp(string $ip) : void {
throw new LocalServerException('Host violates local access rules');
}

$localIps = ['100.100.100.200'];
if ((bool)filter_var($ip, FILTER_VALIDATE_IP) && in_array($ip, $localIps)) {
$this->logger->warning("Host $ip was not connected to because it violates local access rules");
throw new LocalServerException('Host violates local access rules');
}

// Also check for IPv6 IPv4 nesting, because that's not covered by filter_var
if ((bool)filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) && substr_count($ip, '.') > 0) {
$delimiter = strrpos($ip, ':'); // Get last colon
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