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frankarinnet wants to merge 5 commits into from
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Master issue295 tsig fix #296

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b92bcd8
Issue 295, addresses bug with TSIG verification of large responses.
frankarinnet Oct 23, 2023
2def163
Neatened formatting.
frankarinnet Oct 23, 2023
9797928
Test for Issue 295 added as well as a related change to give more con…
nguichon Oct 25, 2023
3997863
Merge branch 'master_issue_295_test' into master_issue295_tsig_fix
nguichon Oct 25, 2023
87ae7ac
Edited docs for modified TSIG generate method
nguichon Oct 25, 2023
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36 changes: 28 additions & 8 deletions src/main/java/org/xbill/DNS/TSIG.java
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Original file line number Diff line number Diff line change
Expand Up @@ -383,20 +383,40 @@ public TSIGRecord generate(Message m, byte[] b, int error, TSIGRecord old) {
*/
public TSIGRecord generate(
Message m, byte[] b, int error, TSIGRecord old, boolean fullSignature) {
Mac hmac = null;
boolean signing = false;

if (error == Rcode.NOERROR || error == Rcode.BADTIME || error == Rcode.BADTRUNC) {
signing = true;
hmac = initHmac();
}

return generate(m, b, error, old, hmac, true, signing, fullSignature);
}

/**
* Generates a TSIG record with a specific error for a message that has been rendered.
*
* @param m The message
* @param b The rendered message
* @param error The error
* @param old If this message is a response, the TSIG from the request
* @param fullSignature {@code true} if this {@link TSIGRecord} is the to be added to the first of
* many messages in a TCP connection and all TSIG variables (rfc2845, 3.4.2.) should be
* included in the signature. {@code false} for subsequent messages with reduced TSIG
* variables set (rfc2845, 4.4.).
* @return The TSIG record to be added to the message
* @since 3.2
*/
public TSIGRecord generate(
Message m, byte[] b, int error, TSIGRecord old, Mac hmac, boolean addLastSignature, boolean signing, boolean fullSignature) {
Instant timeSigned;
if (error == Rcode.BADTIME) {
timeSigned = old.getTimeSigned();
} else {
timeSigned = clock.instant();
}

boolean signing = false;
Mac hmac = null;
if (error == Rcode.NOERROR || error == Rcode.BADTIME || error == Rcode.BADTRUNC) {
signing = true;
hmac = initHmac();
}

Duration fudge;
int fudgeOption = Options.intValue("tsigfudge");
if (fudgeOption < 0 || fudgeOption > 0x7FFF) {
Expand All @@ -405,7 +425,7 @@ public TSIGRecord generate(
fudge = Duration.ofSeconds(fudgeOption);
}

if (old != null && signing) {
if (old != null && addLastSignature) {
hmacAddSignature(hmac, old);
}

Expand Down
122 changes: 108 additions & 14 deletions src/test/java/org/xbill/DNS/TSIGTest.java
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Original file line number Diff line number Diff line change
@@ -1,29 +1,30 @@
// SPDX-License-Identifier: BSD-3-Clause
package org.xbill.DNS;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyInt;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.ValueSource;
import org.mockito.MockedStatic;
import org.mockito.Mockito;
import org.xbill.DNS.utils.base64;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.time.Duration;
import java.time.Instant;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.ValueSource;
import org.mockito.MockedStatic;
import org.mockito.Mockito;
import org.xbill.DNS.utils.base64;

import static org.junit.jupiter.api.Assertions.*;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyInt;

class TSIGTest {
@Test
Expand Down Expand Up @@ -325,4 +326,97 @@ void testTSIGMessageClone() throws IOException {
assertNotNull(cloneBytes);
assertNotEquals(0, cloneBytes.length);
}

@Test
void testTSIGStreamVerifier() throws IOException, NoSuchAlgorithmException, InvalidKeyException {
MockMessageClient client = new MockMessageClient(new TSIG(TSIG.HMAC_SHA256, "example.", "12345678"));
MockMessageServer server = new MockMessageServer(new TSIG(TSIG.HMAC_SHA256, "example.", "12345678"));

byte[] query = client.createQuery();
List<byte[]> response = server.handleQuery(query, 100, 6);
client.validateResponse(query, response);
}

private static class MockMessageClient {
private final TSIG key;

MockMessageClient(TSIG key) {
this.key = key;
}

byte[] createQuery() throws TextParseException {
Name qname = Name.fromString("www.example.");
Record question = Record.newRecord(qname, Type.A, DClass.IN);
Message query = Message.newQuery(question);
query.setTSIG(key);
return query.toWire(Message.MAXLENGTH);
}

public void validateResponse(byte[] query, List<byte[]> response) throws IOException {
Message queryMessage = new Message(query);
TSIG.StreamVerifier verifier = new TSIG.StreamVerifier(key, queryMessage.getTSIG());

for (byte[] resBytes : response) {
Message resMessage = new Message(resBytes);
assertEquals(Rcode.NOERROR, verifier.verify(resMessage, resBytes));
}
}
}

private static class MockMessageServer {
private final TSIG key;

MockMessageServer(TSIG key) {
this.key = key;
}

List<byte[]> handleQuery(byte[] queryMessageBytes, int responseMessageCount, int signEvery) throws IOException, NoSuchAlgorithmException, InvalidKeyException {
Message parsedQueryMessage = new Message(queryMessageBytes);
assertNotNull(parsedQueryMessage.getTSIG());

List<byte[]> responseMessageList = new LinkedList<>();
TSIGRecord lastTsigRecord = parsedQueryMessage.getTSIG();

// Create an HMAC that is shared by messages between each TSIGRecord
Mac sharedHmac = Mac.getInstance("HmacSHA256");
sharedHmac.init(new SecretKeySpec(base64.fromString("12345678"), "HmacSHA256"));

for (int i = 0; i < responseMessageCount; i++) {
Message response = new Message(parsedQueryMessage.getHeader().getID());
response.getHeader().setFlag(Flags.QR);
response.addRecord(parsedQueryMessage.getQuestion(), Section.QUESTION);
Record answer = Record.fromString(parsedQueryMessage.getQuestion().getName(), Type.A, DClass.IN, 300, "1.2.3." + i, null);
response.addRecord(answer, Section.ANSWER);

boolean isNthMessage = i % signEvery == 0;
boolean isLastMessage = i == responseMessageCount - 1;
boolean isFirstMessage = i == 0;
if (isFirstMessage || isNthMessage || isLastMessage) {
byte[] unsignedResponseBytes = response.toWire();

// Create TSIGRecord for the latest message, the trick here is that prior messages without a TSIG have already
// been added to the sharedHmac
lastTsigRecord = key.generate(response, unsignedResponseBytes, Rcode.NOERROR, lastTsigRecord, sharedHmac, isFirstMessage, true, isFirstMessage);
response.addRecord(lastTsigRecord, Section.ADDITIONAL);
response.tsigState = Message.TSIG_SIGNED;

// Store message as a "response"
byte[] signedResponseBytes = response.toWire(Message.MAXLENGTH);
responseMessageList.add(signedResponseBytes);

// The call to generate above called doFinal and cleared sharedHmac, starting a new collection of signatures
// and the first thing that needs to be put in it is the previous signature.
byte[] signatureSize = DNSOutput.toU16(lastTsigRecord.getSignature().length);
sharedHmac.update(signatureSize);
sharedHmac.update(lastTsigRecord.getSignature());
} else {
byte[] responseBytes = response.toWire(Message.MAXLENGTH);
sharedHmac.update(responseBytes);
responseMessageList.add(responseBytes);
}
}

return responseMessageList;
}
}
}