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prevent access to ULA and CGNAT addresses

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Athou
2026-07-05 08:47:45 +02:00
parent b81aac71f5
commit ca8438623d
3 changed files with 14 additions and 3 deletions
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8
commafeed-server/src/main/java/com/commafeed/backend/HttpClientFactory.java
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@@ -39,6 +39,9 @@ import com.commafeed.CommaFeedConfiguration;
import com.commafeed.CommaFeedVersion;
import com.google.common.net.HttpHeaders;
import inet.ipaddr.IPAddress;
import inet.ipaddr.IPAddressNetwork;
import inet.ipaddr.IPAddressString;
import lombok.RequiredArgsConstructor;
import nl.altindag.ssl.SSLFactory;
import nl.altindag.ssl.apache5.util.Apache5SslUtils;
@@ -48,6 +51,7 @@ import nl.altindag.ssl.apache5.util.Apache5SslUtils;
public class HttpClientFactory {
private static final DnsResolver DNS_RESOLVER = SystemDefaultDnsResolver.INSTANCE;
private static final IPAddress CGNAT_RANGE = new IPAddressString("100.64.0.0/10").getAddress();
private final CommaFeedConfiguration config;
private final CommaFeedVersion version;
@@ -111,8 +115,8 @@ public class HttpClientFactory {
}
private static boolean isLocalAddress(InetAddress address) {
return address.isSiteLocalAddress() || address.isAnyLocalAddress() || address.isLinkLocalAddress() || address.isLoopbackAddress()
|| address.isMulticastAddress();
IPAddress ip = new IPAddressNetwork.IPAddressGenerator().from(address);
return ip.isLocal() || ip.isLoopback() || ip.isMulticast() || CGNAT_RANGE.contains(ip);
}
private record BlockLocalAddressesDnsResolver(DnsResolver delegate) implements DnsResolver {

2
commafeed-server/src/test/java/com/commafeed/backend/HttpGetterTest.java
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@@ -408,11 +408,13 @@ class HttpGetterTest {
Assertions.assertThrows(UnknownHostException.class, () -> getter.get("http://10.0.0.1"));
Assertions.assertThrows(UnknownHostException.class, () -> getter.get("http://172.16.0.1"));
Assertions.assertThrows(UnknownHostException.class, () -> getter.get("http://192.168.0.1"));
Assertions.assertThrows(UnknownHostException.class, () -> getter.get("http://100.64.0.1"));
}
@Test
void privateIpv6Ranges() {
Assertions.assertThrows(UnknownHostException.class, () -> getter.get("http://[fe80::215:5dff:fe15:102]"));
Assertions.assertThrows(UnknownHostException.class, () -> getter.get("http://[fd00:dead:beef::50]"));
}
}