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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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Use Symfony IpUtils to check for local IP ranges 
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 91a244e77ef2567793b3290a1a4f7e910c8536bb
9 changes: 6 additions & 3 deletions lib/private/Http/Client/LocalAddressChecker.php
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Original file line number Diff line number Diff line change
Expand Up @@ -37,12 +37,15 @@ public function __construct(ILogger $logger) {
}

public function ThrowIfLocalIp(string $ip) : void {
$localIps = ['100.100.100.200'];
$localRanges = [
'100.64.0.0/10', // See RFC 6598
'192.0.0.0/24', // See RFC 6890
];
if (
(bool)filter_var($ip, FILTER_VALIDATE_IP) &&
(
!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) ||
in_array($ip, $localIps, true)
IpUtils::checkIp($ip, $localRanges)
)) {
$this->logger->warning("Host $ip was not connected to because it violates local access rules");
throw new LocalServerException('Host violates local access rules');
Expand All @@ -55,7 +58,7 @@ public function ThrowIfLocalIp(string $ip) : void {

if (
!filter_var($ipv4Address, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) ||
in_array($ipv4Address, $localIps, true)) {
IpUtils::checkIp($ip, $localRanges)) {
$this->logger->warning("Host $ip was not connected to because it violates local access rules");
throw new LocalServerException('Host violates local access rules');
}
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5 changes: 5 additions & 0 deletions tests/lib/Http/Client/LocalAddressCheckerTest.php
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Expand Up @@ -96,6 +96,8 @@ public function dataInternalIPs() : array {
['10.0.0.1'],
['::'],
['::1'],
['100.100.100.200'],
['192.0.0.1'],
];
}

Expand All @@ -116,6 +118,9 @@ public function dataPreventLocalAddress():array {
['another-host.local'],
['service.localhost'],
['!@#$'], // test invalid url
['100.100.100.200'],
['192.0.0.1'],
['randomdomain.internal'],
];
}

Expand Down