/* This file is part of VoltDB.
* Copyright (C) 2008-2017 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see <http://www.gnu.org/licenses/>.
*/
package org.voltcore.utils.ssl;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ReadOnlyBufferException;
import java.nio.channels.ScatteringByteChannel;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLEngineResult;
import javax.net.ssl.SSLException;
import org.voltcore.network.TLSException;
import io.netty_voltpatches.buffer.ByteBuf;
public class SSLBufferDecrypter {
public final static int TLS_HEADER_SIZE = 5;
private final SSLEngine m_sslEngine;
public SSLBufferDecrypter(SSLEngine sslEngine) {
this.m_sslEngine = sslEngine;
}
public boolean readTLSFrame(ScatteringByteChannel chn, ByteBuf buf) throws IOException {
int widx = buf.writerIndex();
ByteBuf header = buf.slice(widx, TLS_HEADER_SIZE).clear();
int rc = 0;
do {
rc = header.writeBytes(chn, header.writableBytes());
} while(rc > 0 && header.isWritable());
if (rc < 0) {
throw new IOException("channel closed while reading tls frame header");
}
if (rc == 0) return false;
int framesz = header.getShort(3);
if (framesz+header.capacity() > buf.writableBytes()) {
throw new IOException("destination buffer is too small to contain the whole frame");
}
buf.writerIndex(buf.writerIndex() + header.writerIndex());
ByteBuf frame = buf.slice(buf.writerIndex(), framesz).clear();
while (frame.isWritable()) {
if (frame.writeBytes(chn, frame.writableBytes()) < 0) {
throw new IOException("channel closed while reading tls frame header");
}
}
buf.writerIndex(buf.writerIndex()+framesz);
return true;
}
public int tlsunwrap(ByteBuffer srcBuffer, ByteBuffer dstBuffer) {
while (true) {
SSLEngineResult result = null;
ByteBuffer slice = dstBuffer.slice();
try {
result = m_sslEngine.unwrap(srcBuffer, slice);
} catch (SSLException|ReadOnlyBufferException|IllegalArgumentException|IllegalStateException e) {
throw new TLSException("ssl engine unwrap fault", e);
}
switch (result.getStatus()) {
case OK:
if (result.bytesProduced() == 0 && !srcBuffer.hasRemaining()) {
return 0;
}
// in m_dstBuffer, newly decrtyped data is between pos and lim
if (result.bytesProduced() > 0) {
dstBuffer.limit(dstBuffer.position() + result.bytesProduced());
return result.bytesProduced();
}
else {
continue;
}
case BUFFER_OVERFLOW:
throw new TLSException("SSL engine unexpectedly overflowed when decrypting");
case BUFFER_UNDERFLOW:
throw new TLSException("SSL engine unexpectedly underflowed when decrypting");
case CLOSED:
throw new TLSException("SSL engine is closed on ssl unwrap of buffer.");
}
}
}
}