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ensure all bytes are read in socks handshake. fixes #4188

This commit is contained in:
Daniel Gultsch 2021-10-02 14:24:36 +02:00
parent 586fff5485
commit da14f83a42
2 changed files with 106 additions and 70 deletions
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52
src/main/java/eu/siacs/conversations/utils/SocksSocketFactory.java
View File

@ -1,5 +1,7 @@
package eu.siacs.conversations.utils;
import com.google.common.io.ByteStreams;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
@ -12,15 +14,16 @@ import eu.siacs.conversations.Config;
public class SocksSocketFactory {
private static final byte[] LOCALHOST = new byte[]{127,0,0,1};
private static final byte[] LOCALHOST = new byte[]{127, 0, 0, 1};
public static void createSocksConnection(final Socket socket, final String destination, final int port) throws IOException {
//TODO use different Socks Addr Type if destination is IP or IPv6
final InputStream proxyIs = socket.getInputStream();
final OutputStream proxyOs = socket.getOutputStream();
proxyOs.write(new byte[]{0x05, 0x01, 0x00});
proxyOs.flush();
final byte[] handshake = new byte[2];
proxyIs.read(handshake);
ByteStreams.readFully(proxyIs, handshake);
if (handshake[0] != 0x05 || handshake[1] != 0x00) {
throw new SocksConnectionException("Socks 5 handshake failed");
}
@ -32,21 +35,52 @@ public class SocksSocketFactory {
request.putShort((short) port);
proxyOs.write(request.array());
proxyOs.flush();
final byte[] response = new byte[7 + dest.length];
proxyIs.read(response);
if (response[1] != 0x00) {
if (response[1] == 0x04) {
final byte[] response = new byte[4];
ByteStreams.readFully(proxyIs, response);
final byte ver = response[0];
if (ver != 0x05) {
throw new IOException(String.format("Unknown Socks version %02X ", ver));
}
final byte status = response[1];
final byte bndAddrType = response[3];
final byte[] bndDestination = readDestination(bndAddrType, proxyIs);
final byte[] bndPort = new byte[2];
if (bndAddrType == 0x03) {
final String receivedDestination = new String(bndDestination);
if (!receivedDestination.equalsIgnoreCase(destination)) {
throw new IOException(String.format("Destination mismatch. Received %s Expected %s", receivedDestination, destination));
}
}
ByteStreams.readFully(proxyIs, bndPort);
if (status != 0x00) {
if (status == 0x04) {
throw new HostNotFoundException("Host unreachable");
}
if (response[1] == 0x05) {
if (status == 0x05) {
throw new HostNotFoundException("Connection refused");
}
throw new SocksConnectionException("Unable to connect to destination "+(int) (response[1]));
throw new IOException(String.format("Unknown status code %02X ", status));
}
}
private static byte[] readDestination(final byte type, final InputStream inputStream) throws IOException {
final byte[] bndDestination;
if (type == 0x01) {
bndDestination = new byte[4];
} else if (type == 0x03) {
final int length = inputStream.read();
bndDestination = new byte[length];
} else if (type == 0x04) {
bndDestination = new byte[16];
} else {
throw new IOException(String.format("Unknown Socks address type %02X ", type));
}
ByteStreams.readFully(inputStream, bndDestination);
return bndDestination;
}
public static boolean contains(byte needle, byte[] haystack) {
for(byte hay : haystack) {
for (byte hay : haystack) {
if (hay == needle) {
return true;
}

14
src/main/java/eu/siacs/conversations/xmpp/jingle/JingleSocks5Transport.java
View File

@ -3,6 +3,8 @@ package eu.siacs.conversations.xmpp.jingle;
import android.os.PowerManager;
import android.util.Log;
import com.google.common.io.ByteStreams;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
@ -114,26 +116,26 @@ public class JingleSocks5Transport extends JingleTransport {
final byte[] authBegin = new byte[2];
final InputStream inputStream = socket.getInputStream();
final OutputStream outputStream = socket.getOutputStream();
inputStream.read(authBegin);
ByteStreams.readFully(inputStream, authBegin);
if (authBegin[0] != 0x5) {
socket.close();
}
final short methodCount = authBegin[1];
final byte[] methods = new byte[methodCount];
inputStream.read(methods);
ByteStreams.readFully(inputStream, methods);
if (SocksSocketFactory.contains((byte) 0x00, methods)) {
outputStream.write(new byte[]{0x05, 0x00});
} else {
outputStream.write(new byte[]{0x05, (byte) 0xff});
}
byte[] connectCommand = new byte[4];
inputStream.read(connectCommand);
final byte[] connectCommand = new byte[4];
ByteStreams.readFully(inputStream, connectCommand);
if (connectCommand[0] == 0x05 && connectCommand[1] == 0x01 && connectCommand[3] == 0x03) {
int destinationCount = inputStream.read();
final byte[] destination = new byte[destinationCount];
inputStream.read(destination);
ByteStreams.readFully(inputStream, destination);
final byte[] port = new byte[2];
inputStream.read(port);
ByteStreams.readFully(inputStream, port);
final String receivedDestination = new String(destination);
final ByteBuffer response = ByteBuffer.allocate(7 + destination.length);
final byte[] responseHeader;