annotate app/src/main/java/ch/ethz/ssh2/channel/RemoteX11AcceptThread.java @ 507:f7498bd7621b

Added tag stable-1.9.4-5 for changeset b8cc360e1550
author Carl Byington <carl@five-ten-sg.com>
date Wed, 16 Nov 2022 12:07:04 -0700
parents d29cce60f393
children
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1 /*
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2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
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3 * Please refer to the LICENSE.txt for licensing details.
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4 */
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5 package ch.ethz.ssh2.channel;
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6
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7 import java.io.IOException;
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8 import java.io.InputStream;
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9 import java.io.OutputStream;
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10 import java.net.Socket;
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11
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12 import ch.ethz.ssh2.log.Logger;
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13 import ch.ethz.ssh2.util.StringEncoder;
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14
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15 /**
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16 * RemoteX11AcceptThread.
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17 *
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18 * @author Christian Plattner
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19 * @version $Id: RemoteX11AcceptThread.java 119 2014-04-12 20:30:58Z dkocher@sudo.ch $
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20 */
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21 public class RemoteX11AcceptThread extends Thread {
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22 private static final Logger log = Logger.getLogger(RemoteX11AcceptThread.class);
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23
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24 Channel c;
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25
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26 String remoteOriginatorAddress;
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27 int remoteOriginatorPort;
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28
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29 Socket s;
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30
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31 public RemoteX11AcceptThread(Channel c, String remoteOriginatorAddress, int remoteOriginatorPort) {
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32 this.c = c;
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33 this.remoteOriginatorAddress = remoteOriginatorAddress;
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34 this.remoteOriginatorPort = remoteOriginatorPort;
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35 }
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36
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37 @Override
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38 public void run() {
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39 try {
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40 /* Send Open Confirmation */
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41 c.cm.sendOpenConfirmation(c);
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42 /* Read startup packet from client */
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43 OutputStream remote_os = c.getStdinStream();
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44 InputStream remote_is = c.getStdoutStream();
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45 /* The following code is based on the protocol description given in:
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46 * Scheifler/Gettys,
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47 * X Windows System: Core and Extension Protocols:
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48 * X Version 11, Releases 6 and 6.1 ISBN 1-55558-148-X
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49 * (from the ETH library - after being here for almost ten
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50 * years one of the few books I borrowed... sad but true =)
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51 */
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52 /*
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53 * Client startup:
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54 *
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55 * 1 0X42 MSB first/0x6c lSB first - byteorder
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56 * 1 - unused
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57 * 2 card16 - protocol-major-version
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58 * 2 card16 - protocol-minor-version
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59 * 2 n - lenght of authorization-protocol-name
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60 * 2 d - lenght of authorization-protocol-data
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61 * 2 - unused
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62 * string8 - authorization-protocol-name
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63 * p - unused, p=pad(n)
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64 * string8 - authorization-protocol-data
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65 * q - unused, q=pad(d)
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66 *
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67 * pad(X) = (4 - (X mod 4)) mod 4
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68 *
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69 * Server response:
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70 *
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71 * 1 (0 failed, 2 authenticate, 1 success)
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72 * ...
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73 *
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74 */
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75 /* Later on we will simply forward the first 6 header bytes to the "real" X11 server */
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76 byte[] header = new byte[6];
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77
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78 if (remote_is.read(header) != 6)
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79 throw new IOException("Unexpected EOF on X11 startup!");
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80
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81 if ((header[0] != 0x42) && (header[0] != 0x6c)) // 0x42 MSB first, 0x6C LSB first
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82 throw new IOException("Unknown endian format in X11 message!");
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83
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84 /* Yes, I came up with this myself - shall I file an application for a patent? =) */
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85 int idxMSB = (header[0] == 0x42) ? 0 : 1;
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86 /* Read authorization data header */
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87 byte[] auth_buff = new byte[6];
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88
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89 if (remote_is.read(auth_buff) != 6)
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90 throw new IOException("Unexpected EOF on X11 startup!");
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91
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92 int authProtocolNameLength = ((auth_buff[idxMSB] & 0xff) << 8) | (auth_buff[1 - idxMSB] & 0xff);
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93 int authProtocolDataLength = ((auth_buff[2 + idxMSB] & 0xff) << 8) | (auth_buff[3 - idxMSB] & 0xff);
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94
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95 if ((authProtocolNameLength > 256) || (authProtocolDataLength > 256))
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96 throw new IOException("Buggy X11 authorization data");
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97
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98 int authProtocolNamePadding = ((4 - (authProtocolNameLength % 4)) % 4);
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99 int authProtocolDataPadding = ((4 - (authProtocolDataLength % 4)) % 4);
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100 byte[] authProtocolName = new byte[authProtocolNameLength];
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101 byte[] authProtocolData = new byte[authProtocolDataLength];
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102 byte[] paddingBuffer = new byte[4];
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103
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104 if (remote_is.read(authProtocolName) != authProtocolNameLength)
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105 throw new IOException("Unexpected EOF on X11 startup! (authProtocolName)");
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107 if (remote_is.read(paddingBuffer, 0, authProtocolNamePadding) != authProtocolNamePadding)
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108 throw new IOException("Unexpected EOF on X11 startup! (authProtocolNamePadding)");
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109
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110 if (remote_is.read(authProtocolData) != authProtocolDataLength)
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111 throw new IOException("Unexpected EOF on X11 startup! (authProtocolData)");
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112
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113 if (remote_is.read(paddingBuffer, 0, authProtocolDataPadding) != authProtocolDataPadding)
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114 throw new IOException("Unexpected EOF on X11 startup! (authProtocolDataPadding)");
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115
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116 if ("MIT-MAGIC-COOKIE-1".equals(StringEncoder.GetString(authProtocolName)) == false)
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117 throw new IOException("Unknown X11 authorization protocol!");
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118
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119 if (authProtocolDataLength != 16)
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120 throw new IOException("Wrong data length for X11 authorization data!");
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121
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122 StringBuilder tmp = new StringBuilder(32);
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123
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124 for (int i = 0; i < authProtocolData.length; i++) {
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125 String digit2 = Integer.toHexString(authProtocolData[i] & 0xff);
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126 tmp.append((digit2.length() == 2) ? digit2 : "0" + digit2);
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127 }
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128
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129 String hexEncodedFakeCookie = tmp.toString();
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130
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131 /* Order is very important here - it may be that a certain x11 forwarding
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132 * gets disabled right in the moment when we check and register our connection
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133 * */
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134
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135 synchronized (c) {
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136 /* Please read the comment in Channel.java */
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137 c.hexX11FakeCookie = hexEncodedFakeCookie;
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138 }
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139
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140 /* Now check our fake cookie directory to see if we produced this cookie */
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141 X11ServerData sd = c.cm.checkX11Cookie(hexEncodedFakeCookie);
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142
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143 if (sd == null)
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144 throw new IOException("Invalid X11 cookie received.");
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145
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146 /* If the session which corresponds to this cookie is closed then we will
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147 * detect this: the session's close code will close all channels
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148 * with the session's assigned x11 fake cookie.
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149 */
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150 s = new Socket(sd.hostname, sd.port);
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151 OutputStream x11_os = s.getOutputStream();
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152 InputStream x11_is = s.getInputStream();
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153 /* Now we are sending the startup packet to the real X11 server */
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154 x11_os.write(header);
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155
307
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156 if (sd.x11_magic_cookie == null) {
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157 byte[] emptyAuthData = new byte[6];
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158 /* empty auth data, hopefully you are connecting to localhost =) */
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159 x11_os.write(emptyAuthData);
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160 }
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161 else {
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162 if (sd.x11_magic_cookie.length != 16)
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163 throw new IOException("The real X11 cookie has an invalid length!");
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164
307
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165 /* send X11 cookie specified by client */
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166 x11_os.write(auth_buff);
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167 x11_os.write(authProtocolName); /* re-use */
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168 x11_os.write(paddingBuffer, 0, authProtocolNamePadding);
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169 x11_os.write(sd.x11_magic_cookie);
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170 x11_os.write(paddingBuffer, 0, authProtocolDataPadding);
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171 }
273
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172
307
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173 x11_os.flush();
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174 /* Start forwarding traffic */
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175 StreamForwarder r2l = new StreamForwarder(c, null, null, remote_is, x11_os, "RemoteToX11");
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176 StreamForwarder l2r = new StreamForwarder(c, null, null, x11_is, remote_os, "X11ToRemote");
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177 /* No need to start two threads, one can be executed in the current thread */
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178 r2l.setDaemon(true);
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179 r2l.start();
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180 l2r.run();
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181
307
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182 while (r2l.isAlive()) {
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183 try {
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184 r2l.join();
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185 }
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186 catch (InterruptedException ignored) {
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187 }
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188 }
273
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189
307
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190 /* If the channel is already closed, then this is a no-op */
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191 c.cm.closeChannel(c, "EOF on both X11 streams reached.", true);
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192 s.close();
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193 }
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194 catch (IOException e) {
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195 log.warning("IOException in X11 proxy code: " + e.getMessage());
273
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196
307
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197 try {
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198 c.cm.closeChannel(c, e, true);
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199 }
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200 catch (IOException ignored) {
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201 }
273
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202
307
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203 try {
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204 if (s != null)
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205 s.close();
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206 }
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207 catch (IOException ignored) {
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208 }
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209 }
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210 }
273
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211 }