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Code Issues Releases Wiki Activity

Tighten up the $private HTTP rule

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- Block multicast and the fd00::/8 address ranges.
 - Block several cloud metadata providers which sit outside the standard
   address ranges.
This commit is contained in:
Jonathan Coates 2023-07-01 17:00:28 +01:00
parent cc8c1f38e7
commit 4bbde8c50c
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GPG Key ID: B9E431FF07C98D06
2 changed files with 39 additions and 5 deletions
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35
projects/core/src/main/java/dan200/computercraft/core/apis/http/options/AddressPredicate.java
View File

@ -6,9 +6,13 @@
import com.google.common.net.InetAddresses;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.Arrays;
import java.util.Set;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
/**
* A predicate on an address. Matches against a domain and an ip address.
@ -107,12 +111,35 @@ public boolean matches(InetAddress socketAddress) {
final class PrivatePattern implements AddressPredicate {
static final PrivatePattern INSTANCE = new PrivatePattern();
private static final Set<InetAddress> additionalAddresses = Arrays.stream(new String[]{
// Block various cloud providers internal IPs.
"100.100.100.200", // Alibaba
"192.0.0.192", // Oracle
}).map(InetAddresses::forString).collect(Collectors.toUnmodifiableSet());
@Override
public boolean matches(InetAddress socketAddress) {
return socketAddress.isAnyLocalAddress()
|| socketAddress.isLoopbackAddress()
|| socketAddress.isLinkLocalAddress()
|| socketAddress.isSiteLocalAddress();
return
socketAddress.isAnyLocalAddress() // 0.0.0.0, ::0
|| socketAddress.isLoopbackAddress() // 127.0.0.0/8, ::1
|| socketAddress.isLinkLocalAddress() // 169.254.0.0/16, fe80::/10
|| socketAddress.isSiteLocalAddress() // 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, fec0::/10
|| socketAddress.isMulticastAddress() // 224.0.0.0/4, ff00::/8
|| isUniqueLocalAddress(socketAddress) // fd00::/8
|| additionalAddresses.contains(socketAddress);
}
/**
* Determine if an IP address lives inside the ULA address range.
*
* @param address The IP address to test.
* @return Whether this address sits in the ULA address range.
* @see <a href="https://en.wikipedia.org/wiki/Unique_local_address">Unique local address on Wikipedia</a>
*/
private boolean isUniqueLocalAddress(InetAddress address) {
// ULA is actually defined as fc00::/7 (so both fc00::/8 and fd00::/8). However, only the latter is actually
// defined right now, so let's be conservative.
return address instanceof Inet6Address && (address.getAddress()[0] & 0xff) == 0xfd;
}
}

9
projects/core/src/test/java/dan200/computercraft/core/apis/http/options/AddressRuleTest.java
View File

@ -31,7 +31,14 @@ public void matchesPort() {
@ValueSource(strings = {
"0.0.0.0", "[::]",
"localhost", "127.0.0.1.nip.io", "127.0.0.1", "[::1]",
"172.17.0.1", "192.168.1.114", "[0:0:0:0:0:ffff:c0a8:172]", "10.0.0.1"
"172.17.0.1", "192.168.1.114", "[0:0:0:0:0:ffff:c0a8:172]", "10.0.0.1",
// Multicast
"224.0.0.1", "ff02::1",
// Cloud metadata providers
"100.100.100.200", // Alibaba
"192.0.0.192", // Oracle
"fd00:ec2::254", // AWS
"169.254.169.254", // AWS, Digital Ocean, GCP, etc..
})
public void blocksLocalDomains(String domain) {
assertEquals(apply(CoreConfig.httpRules, domain, 80).action, Action.DENY);