diff options
Diffstat (limited to 'lib/src/main/java/com/trilead/ssh2/channel/RemoteX11AcceptThread.java')
-rw-r--r-- | lib/src/main/java/com/trilead/ssh2/channel/RemoteX11AcceptThread.java | 240 |
1 files changed, 0 insertions, 240 deletions
diff --git a/lib/src/main/java/com/trilead/ssh2/channel/RemoteX11AcceptThread.java b/lib/src/main/java/com/trilead/ssh2/channel/RemoteX11AcceptThread.java deleted file mode 100644 index 9f99410..0000000 --- a/lib/src/main/java/com/trilead/ssh2/channel/RemoteX11AcceptThread.java +++ /dev/null @@ -1,240 +0,0 @@ - -package com.trilead.ssh2.channel; - -import java.io.IOException; -import java.io.InputStream; -import java.io.OutputStream; -import java.net.Socket; - -import com.trilead.ssh2.log.Logger; - - -/** - * RemoteX11AcceptThread. - * - * @author Christian Plattner, plattner@trilead.com - * @version $Id: RemoteX11AcceptThread.java,v 1.2 2008/04/01 12:38:09 cplattne Exp $ - */ -public class RemoteX11AcceptThread extends Thread -{ - private static final Logger log = Logger.getLogger(RemoteX11AcceptThread.class); - - Channel c; - - String remoteOriginatorAddress; - int remoteOriginatorPort; - - Socket s; - - public RemoteX11AcceptThread(Channel c, String remoteOriginatorAddress, int remoteOriginatorPort) - { - this.c = c; - this.remoteOriginatorAddress = remoteOriginatorAddress; - this.remoteOriginatorPort = remoteOriginatorPort; - } - - public void run() - { - try - { - /* Send Open Confirmation */ - - c.cm.sendOpenConfirmation(c); - - /* Read startup packet from client */ - - OutputStream remote_os = c.getStdinStream(); - InputStream remote_is = c.getStdoutStream(); - - /* The following code is based on the protocol description given in: - * Scheifler/Gettys, - * X Windows System: Core and Extension Protocols: - * X Version 11, Releases 6 and 6.1 ISBN 1-55558-148-X - */ - - /* - * Client startup: - * - * 1 0X42 MSB first/0x6c lSB first - byteorder - * 1 - unused - * 2 card16 - protocol-major-version - * 2 card16 - protocol-minor-version - * 2 n - lenght of authorization-protocol-name - * 2 d - lenght of authorization-protocol-data - * 2 - unused - * string8 - authorization-protocol-name - * p - unused, p=pad(n) - * string8 - authorization-protocol-data - * q - unused, q=pad(d) - * - * pad(X) = (4 - (X mod 4)) mod 4 - * - * Server response: - * - * 1 (0 failed, 2 authenticate, 1 success) - * ... - * - */ - - /* Later on we will simply forward the first 6 header bytes to the "real" X11 server */ - - byte[] header = new byte[6]; - - if (remote_is.read(header) != 6) - throw new IOException("Unexpected EOF on X11 startup!"); - - if ((header[0] != 0x42) && (header[0] != 0x6c)) // 0x42 MSB first, 0x6C LSB first - throw new IOException("Unknown endian format in X11 message!"); - - /* Yes, I came up with this myself - shall I file an application for a patent? =) */ - - int idxMSB = (header[0] == 0x42) ? 0 : 1; - - /* Read authorization data header */ - - byte[] auth_buff = new byte[6]; - - if (remote_is.read(auth_buff) != 6) - throw new IOException("Unexpected EOF on X11 startup!"); - - int authProtocolNameLength = ((auth_buff[idxMSB] & 0xff) << 8) | (auth_buff[1 - idxMSB] & 0xff); - int authProtocolDataLength = ((auth_buff[2 + idxMSB] & 0xff) << 8) | (auth_buff[3 - idxMSB] & 0xff); - - if ((authProtocolNameLength > 256) || (authProtocolDataLength > 256)) - throw new IOException("Buggy X11 authorization data"); - - int authProtocolNamePadding = ((4 - (authProtocolNameLength % 4)) % 4); - int authProtocolDataPadding = ((4 - (authProtocolDataLength % 4)) % 4); - - byte[] authProtocolName = new byte[authProtocolNameLength]; - byte[] authProtocolData = new byte[authProtocolDataLength]; - - byte[] paddingBuffer = new byte[4]; - - if (remote_is.read(authProtocolName) != authProtocolNameLength) - throw new IOException("Unexpected EOF on X11 startup! (authProtocolName)"); - - if (remote_is.read(paddingBuffer, 0, authProtocolNamePadding) != authProtocolNamePadding) - throw new IOException("Unexpected EOF on X11 startup! (authProtocolNamePadding)"); - - if (remote_is.read(authProtocolData) != authProtocolDataLength) - throw new IOException("Unexpected EOF on X11 startup! (authProtocolData)"); - - if (remote_is.read(paddingBuffer, 0, authProtocolDataPadding) != authProtocolDataPadding) - throw new IOException("Unexpected EOF on X11 startup! (authProtocolDataPadding)"); - - if ("MIT-MAGIC-COOKIE-1".equals(new String(authProtocolName, "ISO-8859-1")) == false) - throw new IOException("Unknown X11 authorization protocol!"); - - if (authProtocolDataLength != 16) - throw new IOException("Wrong data length for X11 authorization data!"); - - StringBuffer tmp = new StringBuffer(32); - for (int i = 0; i < authProtocolData.length; i++) - { - String digit2 = Integer.toHexString(authProtocolData[i] & 0xff); - tmp.append((digit2.length() == 2) ? digit2 : "0" + digit2); - } - String hexEncodedFakeCookie = tmp.toString(); - - /* Order is very important here - it may be that a certain x11 forwarding - * gets disabled right in the moment when we check and register our connection - * */ - - synchronized (c) - { - /* Please read the comment in Channel.java */ - c.hexX11FakeCookie = hexEncodedFakeCookie; - } - - /* Now check our fake cookie directory to see if we produced this cookie */ - - X11ServerData sd = c.cm.checkX11Cookie(hexEncodedFakeCookie); - - if (sd == null) - throw new IOException("Invalid X11 cookie received."); - - /* If the session which corresponds to this cookie is closed then we will - * detect this: the session's close code will close all channels - * with the session's assigned x11 fake cookie. - */ - - s = new Socket(sd.hostname, sd.port); - - OutputStream x11_os = s.getOutputStream(); - InputStream x11_is = s.getInputStream(); - - /* Now we are sending the startup packet to the real X11 server */ - - x11_os.write(header); - - if (sd.x11_magic_cookie == null) - { - byte[] emptyAuthData = new byte[6]; - /* empty auth data, hopefully you are connecting to localhost =) */ - x11_os.write(emptyAuthData); - } - else - { - if (sd.x11_magic_cookie.length != 16) - throw new IOException("The real X11 cookie has an invalid length!"); - - /* send X11 cookie specified by client */ - x11_os.write(auth_buff); - x11_os.write(authProtocolName); /* re-use */ - x11_os.write(paddingBuffer, 0, authProtocolNamePadding); - x11_os.write(sd.x11_magic_cookie); - x11_os.write(paddingBuffer, 0, authProtocolDataPadding); - } - - x11_os.flush(); - - /* Start forwarding traffic */ - - StreamForwarder r2l = new StreamForwarder(c, null, s, remote_is, x11_os, "RemoteToX11"); - StreamForwarder l2r = new StreamForwarder(c, null, null, x11_is, remote_os, "X11ToRemote"); - - /* No need to start two threads, one can be executed in the current thread */ - - r2l.setDaemon(true); - r2l.start(); - l2r.run(); - - while (r2l.isAlive()) - { - try - { - r2l.join(); - } - catch (InterruptedException e) - { - } - } - - /* If the channel is already closed, then this is a no-op */ - - c.cm.closeChannel(c, "EOF on both X11 streams reached.", true); - s.close(); - } - catch (IOException e) - { - log.log(50, "IOException in X11 proxy code: " + e.getMessage()); - - try - { - c.cm.closeChannel(c, "IOException in X11 proxy code (" + e.getMessage() + ")", true); - } - catch (IOException e1) - { - } - try - { - if (s != null) - s.close(); - } - catch (IOException e1) - { - } - } - } -} |