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/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.nio.ByteBuffer;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLEngineResult;
import javax.net.ssl.SSLException;
/**
* Testing SSLEngine incorrect app data packages unwrapping.
*/
public class BufferOverflowUnderflowTest extends SSLEngineTestCase {
private final String MESSAGE = "Hello peer!";
public static void main(String[] args) {
BufferOverflowUnderflowTest test = new BufferOverflowUnderflowTest();
setUpAndStartKDCIfNeeded();
test.runTests();
}
@Override
protected void testOneCipher(String cipher) throws SSLException {
SSLContext context = getContext();
int maxPacketSize = getMaxPacketSize();
boolean useSNI = !TEST_MODE.equals("norm");
SSLEngine clientEngine = getClientSSLEngine(context, useSNI);
SSLEngine serverEngine = getServerSSLEngine(context, useSNI);
clientEngine.setEnabledCipherSuites(new String[]{cipher});
serverEngine.setEnabledCipherSuites(new String[]{cipher});
serverEngine.setNeedClientAuth(!cipher.contains("anon"));
doHandshake(clientEngine, serverEngine, maxPacketSize,
HandshakeMode.INITIAL_HANDSHAKE);
checkBufferOverflowOnWrap(clientEngine);
checkBufferOverflowOnWrap(serverEngine);
checkBufferOverflowOnUnWrap(clientEngine, serverEngine);
checkBufferOverflowOnUnWrap(serverEngine, clientEngine);
checkBufferUnderflowOnUnWrap(serverEngine, clientEngine);
checkBufferUnderflowOnUnWrap(clientEngine, serverEngine);
}
private void checkBufferOverflowOnWrap(SSLEngine engine)
throws SSLException {
String mode = engine.getUseClientMode() ? "client"
: "server";
System.out.println("================================================="
+ "===========");
System.out.println("Testing SSLEngine buffer overflow"
+ " on wrap by " + mode);
ByteBuffer app = ByteBuffer.wrap(MESSAGE.getBytes());
//Making net buffer size less than required by 1 byte.
ByteBuffer net = ByteBuffer
.allocate(engine.getSession().getPacketBufferSize() - 1);
SSLEngineResult r = engine.wrap(app, net);
checkResult(r, SSLEngineResult.Status.BUFFER_OVERFLOW);
System.out.println("Passed");
}
private void checkBufferOverflowOnUnWrap(SSLEngine wrappingEngine,
SSLEngine unwrappingEngine)
throws SSLException {
String wrapperMode = wrappingEngine.getUseClientMode() ? "client"
: "server";
String unwrapperMode = unwrappingEngine.getUseClientMode() ? "client"
: "server";
if (wrapperMode.equals(unwrapperMode)) {
throw new Error("Test error: both engines are in the same mode!");
}
System.out.println("================================================="
+ "===========");
System.out.println("Testing SSLEngine buffer overflow"
+ " on unwrap by " + unwrapperMode);
ByteBuffer app = ByteBuffer.wrap(MESSAGE.getBytes());
ByteBuffer net = ByteBuffer
.allocate(wrappingEngine.getSession().getPacketBufferSize());
SSLEngineResult r = wrappingEngine.wrap(app, net);
checkResult(r, SSLEngineResult.Status.OK);
//Making app buffer size less than required by 1 byte.
app = ByteBuffer.allocate(MESSAGE.length() - 1);
net.flip();
r = unwrappingEngine.unwrap(net, app);
checkResult(r, SSLEngineResult.Status.BUFFER_OVERFLOW);
System.out.println("Passed");
}
private void checkBufferUnderflowOnUnWrap(SSLEngine wrappingEngine,
SSLEngine unwrappingEngine)
throws SSLException {
String wrapperMode = wrappingEngine.getUseClientMode() ? "client"
: "server";
String unwrapperMode = unwrappingEngine.getUseClientMode() ? "client"
: "server";
if (wrapperMode.equals(unwrapperMode)) {
throw new Error("Test error: both engines are in the same mode!");
}
System.out.println("================================================="
+ "===========");
System.out.println("Testing SSLEngine buffer underflow"
+ " on unwrap by " + unwrapperMode);
ByteBuffer app = ByteBuffer.wrap(MESSAGE.getBytes());
ByteBuffer net = ByteBuffer
.allocate(wrappingEngine.getSession().getPacketBufferSize());
SSLEngineResult r = wrappingEngine.wrap(app, net);
checkResult(r, SSLEngineResult.Status.OK);
app = ByteBuffer.allocate(unwrappingEngine.getSession()
.getApplicationBufferSize());
net.flip();
//Making net buffer size less than size of dtls message.
net.limit(net.limit() - 1);
r = unwrappingEngine.unwrap(net, app);
checkResult(r, SSLEngineResult.Status.BUFFER_UNDERFLOW);
System.out.println("Passed");
}
}
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