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annotate src/ch/ethz/ssh2/channel/RemoteX11AcceptThread.java @ 273:91a31873c42a ganymed

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start conversion from trilead to ganymed
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 11:21:46 -0700
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children 071eccdff8ea
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273
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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 {
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23 private static final Logger log = Logger.getLogger(RemoteX11AcceptThread.class);
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24
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25 Channel c;
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26
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27 String remoteOriginatorAddress;
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28 int remoteOriginatorPort;
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29
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30 Socket s;
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31
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32 public RemoteX11AcceptThread(Channel c, String remoteOriginatorAddress, int remoteOriginatorPort)
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33 {
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34 this.c = c;
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35 this.remoteOriginatorAddress = remoteOriginatorAddress;
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36 this.remoteOriginatorPort = remoteOriginatorPort;
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37 }
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38
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39 @Override
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40 public void run()
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41 {
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42 try
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43 {
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44 /* Send Open Confirmation */
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45
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46 c.cm.sendOpenConfirmation(c);
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47
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48 /* Read startup packet from client */
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49
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50 OutputStream remote_os = c.getStdinStream();
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51 InputStream remote_is = c.getStdoutStream();
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52
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53 /* The following code is based on the protocol description given in:
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54 * Scheifler/Gettys,
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55 * X Windows System: Core and Extension Protocols:
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56 * X Version 11, Releases 6 and 6.1 ISBN 1-55558-148-X
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57 * (from the ETH library - after being here for almost ten
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58 * years one of the few books I borrowed... sad but true =)
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59 */
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60
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61 /*
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62 * Client startup:
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63 *
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64 * 1 0X42 MSB first/0x6c lSB first - byteorder
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65 * 1 - unused
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66 * 2 card16 - protocol-major-version
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67 * 2 card16 - protocol-minor-version
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68 * 2 n - lenght of authorization-protocol-name
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69 * 2 d - lenght of authorization-protocol-data
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70 * 2 - unused
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71 * string8 - authorization-protocol-name
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72 * p - unused, p=pad(n)
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73 * string8 - authorization-protocol-data
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74 * q - unused, q=pad(d)
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75 *
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76 * pad(X) = (4 - (X mod 4)) mod 4
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77 *
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78 * Server response:
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79 *
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80 * 1 (0 failed, 2 authenticate, 1 success)
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81 * ...
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82 *
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83 */
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84
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85 /* Later on we will simply forward the first 6 header bytes to the "real" X11 server */
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86
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87 byte[] header = new byte[6];
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88
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89 if (remote_is.read(header) != 6)
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90 throw new IOException("Unexpected EOF on X11 startup!");
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91
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92 if ((header[0] != 0x42) && (header[0] != 0x6c)) // 0x42 MSB first, 0x6C LSB first
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93 throw new IOException("Unknown endian format in X11 message!");
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94
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95 /* Yes, I came up with this myself - shall I file an application for a patent? =) */
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96
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97 int idxMSB = (header[0] == 0x42) ? 0 : 1;
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98
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99 /* Read authorization data header */
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100
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101 byte[] auth_buff = new byte[6];
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102
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103 if (remote_is.read(auth_buff) != 6)
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104 throw new IOException("Unexpected EOF on X11 startup!");
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105
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106 int authProtocolNameLength = ((auth_buff[idxMSB] & 0xff) << 8) | (auth_buff[1 - idxMSB] & 0xff);
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107 int authProtocolDataLength = ((auth_buff[2 + idxMSB] & 0xff) << 8) | (auth_buff[3 - idxMSB] & 0xff);
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108
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109 if ((authProtocolNameLength > 256) || (authProtocolDataLength > 256))
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110 throw new IOException("Buggy X11 authorization data");
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111
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112 int authProtocolNamePadding = ((4 - (authProtocolNameLength % 4)) % 4);
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113 int authProtocolDataPadding = ((4 - (authProtocolDataLength % 4)) % 4);
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114
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115 byte[] authProtocolName = new byte[authProtocolNameLength];
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116 byte[] authProtocolData = new byte[authProtocolDataLength];
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117
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118 byte[] paddingBuffer = new byte[4];
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119
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120 if (remote_is.read(authProtocolName) != authProtocolNameLength)
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121 throw new IOException("Unexpected EOF on X11 startup! (authProtocolName)");
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122
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123 if (remote_is.read(paddingBuffer, 0, authProtocolNamePadding) != authProtocolNamePadding)
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124 throw new IOException("Unexpected EOF on X11 startup! (authProtocolNamePadding)");
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125
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126 if (remote_is.read(authProtocolData) != authProtocolDataLength)
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127 throw new IOException("Unexpected EOF on X11 startup! (authProtocolData)");
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128
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129 if (remote_is.read(paddingBuffer, 0, authProtocolDataPadding) != authProtocolDataPadding)
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130 throw new IOException("Unexpected EOF on X11 startup! (authProtocolDataPadding)");
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131
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132 if ("MIT-MAGIC-COOKIE-1".equals(StringEncoder.GetString(authProtocolName)) == false)
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133 throw new IOException("Unknown X11 authorization protocol!");
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134
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135 if (authProtocolDataLength != 16)
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136 throw new IOException("Wrong data length for X11 authorization data!");
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137
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138 StringBuilder tmp = new StringBuilder(32);
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139 for (int i = 0; i < authProtocolData.length; i++)
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140 {
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141 String digit2 = Integer.toHexString(authProtocolData[i] & 0xff);
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142 tmp.append((digit2.length() == 2) ? digit2 : "0" + digit2);
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143 }
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144 String hexEncodedFakeCookie = tmp.toString();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
145
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
146 /* Order is very important here - it may be that a certain x11 forwarding
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
147 * gets disabled right in the moment when we check and register our connection
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
148 * */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
149
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
150 synchronized (c)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
151 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
152 /* Please read the comment in Channel.java */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
153 c.hexX11FakeCookie = hexEncodedFakeCookie;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
154 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
155
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
156 /* Now check our fake cookie directory to see if we produced this cookie */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
157
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
158 X11ServerData sd = c.cm.checkX11Cookie(hexEncodedFakeCookie);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
159
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
160 if (sd == null)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
161 throw new IOException("Invalid X11 cookie received.");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
162
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
163 /* If the session which corresponds to this cookie is closed then we will
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
164 * detect this: the session's close code will close all channels
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
165 * with the session's assigned x11 fake cookie.
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
166 */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
167
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
168 s = new Socket(sd.hostname, sd.port);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
169
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
170 OutputStream x11_os = s.getOutputStream();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
171 InputStream x11_is = s.getInputStream();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
172
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
173 /* Now we are sending the startup packet to the real X11 server */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
174
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
175 x11_os.write(header);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
176
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
177 if (sd.x11_magic_cookie == null)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
178 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
179 byte[] emptyAuthData = new byte[6];
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
180 /* empty auth data, hopefully you are connecting to localhost =) */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
181 x11_os.write(emptyAuthData);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
182 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
183 else
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
184 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
185 if (sd.x11_magic_cookie.length != 16)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
186 throw new IOException("The real X11 cookie has an invalid length!");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
187
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
188 /* send X11 cookie specified by client */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
189 x11_os.write(auth_buff);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
190 x11_os.write(authProtocolName); /* re-use */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
191 x11_os.write(paddingBuffer, 0, authProtocolNamePadding);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
192 x11_os.write(sd.x11_magic_cookie);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
193 x11_os.write(paddingBuffer, 0, authProtocolDataPadding);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
194 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
195
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
196 x11_os.flush();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
197
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
198 /* Start forwarding traffic */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
199
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
200 StreamForwarder r2l = new StreamForwarder(c, null, null, remote_is, x11_os, "RemoteToX11");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
201 StreamForwarder l2r = new StreamForwarder(c, null, null, x11_is, remote_os, "X11ToRemote");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
202
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
203 /* No need to start two threads, one can be executed in the current thread */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
204
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
205 r2l.setDaemon(true);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
206 r2l.start();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
207 l2r.run();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
208
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
209 while (r2l.isAlive())
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
210 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
211 try
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
212 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
213 r2l.join();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
214 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
215 catch (InterruptedException ignored)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
216 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
217 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
218 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
219
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
220 /* If the channel is already closed, then this is a no-op */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
221
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
222 c.cm.closeChannel(c, "EOF on both X11 streams reached.", true);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
223 s.close();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
224 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
225 catch (IOException e)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
226 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
227 log.warning("IOException in X11 proxy code: " + e.getMessage());
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
228
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
229 try
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
230 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
231 c.cm.closeChannel(c, e, true);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
232 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
233 catch (IOException ignored)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
234 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
235 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
236 try
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
237 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
238 if (s != null)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
239 s.close();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
240 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
241 catch (IOException ignored)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
242 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
243 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
244 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
245 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
246 }