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annotate src/ch/ethz/ssh2/channel/RemoteX11AcceptThread.java @ 435:9c6a269fabb5 stable-1.9.2
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| author | Carl Byington <carl@five-ten-sg.com> |
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| date | Thu, 09 Apr 2015 11:32:38 -0700 |
| parents | 071eccdff8ea |
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| rev | line source |
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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 */ |
| 307 | 21 public class RemoteX11AcceptThread extends Thread { |
| 22 private static final Logger log = Logger.getLogger(RemoteX11AcceptThread.class); | |
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23 |
| 307 | 24 Channel c; |
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25 |
| 307 | 26 String remoteOriginatorAddress; |
| 27 int remoteOriginatorPort; | |
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28 |
| 307 | 29 Socket s; |
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30 |
| 307 | 31 public RemoteX11AcceptThread(Channel c, String remoteOriginatorAddress, int remoteOriginatorPort) { |
| 32 this.c = c; | |
| 33 this.remoteOriginatorAddress = remoteOriginatorAddress; | |
| 34 this.remoteOriginatorPort = remoteOriginatorPort; | |
| 35 } | |
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36 |
| 307 | 37 @Override |
| 38 public void run() { | |
| 39 try { | |
| 40 /* Send Open Confirmation */ | |
| 41 c.cm.sendOpenConfirmation(c); | |
| 42 /* Read startup packet from client */ | |
| 43 OutputStream remote_os = c.getStdinStream(); | |
| 44 InputStream remote_is = c.getStdoutStream(); | |
| 45 /* The following code is based on the protocol description given in: | |
| 46 * Scheifler/Gettys, | |
| 47 * X Windows System: Core and Extension Protocols: | |
| 48 * X Version 11, Releases 6 and 6.1 ISBN 1-55558-148-X | |
| 49 * (from the ETH library - after being here for almost ten | |
| 50 * years one of the few books I borrowed... sad but true =) | |
| 51 */ | |
| 52 /* | |
| 53 * Client startup: | |
| 54 * | |
| 55 * 1 0X42 MSB first/0x6c lSB first - byteorder | |
| 56 * 1 - unused | |
| 57 * 2 card16 - protocol-major-version | |
| 58 * 2 card16 - protocol-minor-version | |
| 59 * 2 n - lenght of authorization-protocol-name | |
| 60 * 2 d - lenght of authorization-protocol-data | |
| 61 * 2 - unused | |
| 62 * string8 - authorization-protocol-name | |
| 63 * p - unused, p=pad(n) | |
| 64 * string8 - authorization-protocol-data | |
| 65 * q - unused, q=pad(d) | |
| 66 * | |
| 67 * pad(X) = (4 - (X mod 4)) mod 4 | |
| 68 * | |
| 69 * Server response: | |
| 70 * | |
| 71 * 1 (0 failed, 2 authenticate, 1 success) | |
| 72 * ... | |
| 73 * | |
| 74 */ | |
| 75 /* Later on we will simply forward the first 6 header bytes to the "real" X11 server */ | |
| 76 byte[] header = new byte[6]; | |
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77 |
| 307 | 78 if (remote_is.read(header) != 6) |
| 79 throw new IOException("Unexpected EOF on X11 startup!"); | |
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80 |
| 307 | 81 if ((header[0] != 0x42) && (header[0] != 0x6c)) // 0x42 MSB first, 0x6C LSB first |
| 82 throw new IOException("Unknown endian format in X11 message!"); | |
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83 |
| 307 | 84 /* Yes, I came up with this myself - shall I file an application for a patent? =) */ |
| 85 int idxMSB = (header[0] == 0x42) ? 0 : 1; | |
| 86 /* Read authorization data header */ | |
| 87 byte[] auth_buff = new byte[6]; | |
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88 |
| 307 | 89 if (remote_is.read(auth_buff) != 6) |
| 90 throw new IOException("Unexpected EOF on X11 startup!"); | |
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91 |
| 307 | 92 int authProtocolNameLength = ((auth_buff[idxMSB] & 0xff) << 8) | (auth_buff[1 - idxMSB] & 0xff); |
| 93 int authProtocolDataLength = ((auth_buff[2 + idxMSB] & 0xff) << 8) | (auth_buff[3 - idxMSB] & 0xff); | |
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94 |
| 307 | 95 if ((authProtocolNameLength > 256) || (authProtocolDataLength > 256)) |
| 96 throw new IOException("Buggy X11 authorization data"); | |
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97 |
| 307 | 98 int authProtocolNamePadding = ((4 - (authProtocolNameLength % 4)) % 4); |
| 99 int authProtocolDataPadding = ((4 - (authProtocolDataLength % 4)) % 4); | |
| 100 byte[] authProtocolName = new byte[authProtocolNameLength]; | |
| 101 byte[] authProtocolData = new byte[authProtocolDataLength]; | |
| 102 byte[] paddingBuffer = new byte[4]; | |
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103 |
| 307 | 104 if (remote_is.read(authProtocolName) != authProtocolNameLength) |
| 105 throw new IOException("Unexpected EOF on X11 startup! (authProtocolName)"); | |
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106 |
| 307 | 107 if (remote_is.read(paddingBuffer, 0, authProtocolNamePadding) != authProtocolNamePadding) |
| 108 throw new IOException("Unexpected EOF on X11 startup! (authProtocolNamePadding)"); | |
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109 |
| 307 | 110 if (remote_is.read(authProtocolData) != authProtocolDataLength) |
| 111 throw new IOException("Unexpected EOF on X11 startup! (authProtocolData)"); | |
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112 |
| 307 | 113 if (remote_is.read(paddingBuffer, 0, authProtocolDataPadding) != authProtocolDataPadding) |
| 114 throw new IOException("Unexpected EOF on X11 startup! (authProtocolDataPadding)"); | |
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115 |
| 307 | 116 if ("MIT-MAGIC-COOKIE-1".equals(StringEncoder.GetString(authProtocolName)) == false) |
| 117 throw new IOException("Unknown X11 authorization protocol!"); | |
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118 |
| 307 | 119 if (authProtocolDataLength != 16) |
| 120 throw new IOException("Wrong data length for X11 authorization data!"); | |
| 121 | |
| 122 StringBuilder tmp = new StringBuilder(32); | |
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123 |
| 307 | 124 for (int i = 0; i < authProtocolData.length; i++) { |
| 125 String digit2 = Integer.toHexString(authProtocolData[i] & 0xff); | |
| 126 tmp.append((digit2.length() == 2) ? digit2 : "0" + digit2); | |
| 127 } | |
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128 |
| 307 | 129 String hexEncodedFakeCookie = tmp.toString(); |
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130 |
| 307 | 131 /* Order is very important here - it may be that a certain x11 forwarding |
| 132 * gets disabled right in the moment when we check and register our connection | |
| 133 * */ | |
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134 |
| 307 | 135 synchronized (c) { |
| 136 /* Please read the comment in Channel.java */ | |
| 137 c.hexX11FakeCookie = hexEncodedFakeCookie; | |
| 138 } | |
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139 |
| 307 | 140 /* Now check our fake cookie directory to see if we produced this cookie */ |
| 141 X11ServerData sd = c.cm.checkX11Cookie(hexEncodedFakeCookie); | |
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142 |
| 307 | 143 if (sd == null) |
| 144 throw new IOException("Invalid X11 cookie received."); | |
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145 |
| 307 | 146 /* If the session which corresponds to this cookie is closed then we will |
| 147 * detect this: the session's close code will close all channels | |
| 148 * with the session's assigned x11 fake cookie. | |
| 149 */ | |
| 150 s = new Socket(sd.hostname, sd.port); | |
| 151 OutputStream x11_os = s.getOutputStream(); | |
| 152 InputStream x11_is = s.getInputStream(); | |
| 153 /* Now we are sending the startup packet to the real X11 server */ | |
| 154 x11_os.write(header); | |
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155 |
| 307 | 156 if (sd.x11_magic_cookie == null) { |
| 157 byte[] emptyAuthData = new byte[6]; | |
| 158 /* empty auth data, hopefully you are connecting to localhost =) */ | |
| 159 x11_os.write(emptyAuthData); | |
| 160 } | |
| 161 else { | |
| 162 if (sd.x11_magic_cookie.length != 16) | |
| 163 throw new IOException("The real X11 cookie has an invalid length!"); | |
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164 |
| 307 | 165 /* send X11 cookie specified by client */ |
| 166 x11_os.write(auth_buff); | |
| 167 x11_os.write(authProtocolName); /* re-use */ | |
| 168 x11_os.write(paddingBuffer, 0, authProtocolNamePadding); | |
| 169 x11_os.write(sd.x11_magic_cookie); | |
| 170 x11_os.write(paddingBuffer, 0, authProtocolDataPadding); | |
| 171 } | |
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172 |
| 307 | 173 x11_os.flush(); |
| 174 /* Start forwarding traffic */ | |
| 175 StreamForwarder r2l = new StreamForwarder(c, null, null, remote_is, x11_os, "RemoteToX11"); | |
| 176 StreamForwarder l2r = new StreamForwarder(c, null, null, x11_is, remote_os, "X11ToRemote"); | |
| 177 /* No need to start two threads, one can be executed in the current thread */ | |
| 178 r2l.setDaemon(true); | |
| 179 r2l.start(); | |
| 180 l2r.run(); | |
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181 |
| 307 | 182 while (r2l.isAlive()) { |
| 183 try { | |
| 184 r2l.join(); | |
| 185 } | |
| 186 catch (InterruptedException ignored) { | |
| 187 } | |
| 188 } | |
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189 |
| 307 | 190 /* If the channel is already closed, then this is a no-op */ |
| 191 c.cm.closeChannel(c, "EOF on both X11 streams reached.", true); | |
| 192 s.close(); | |
| 193 } | |
| 194 catch (IOException e) { | |
| 195 log.warning("IOException in X11 proxy code: " + e.getMessage()); | |
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196 |
| 307 | 197 try { |
| 198 c.cm.closeChannel(c, e, true); | |
| 199 } | |
| 200 catch (IOException ignored) { | |
| 201 } | |
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202 |
| 307 | 203 try { |
| 204 if (s != null) | |
| 205 s.close(); | |
| 206 } | |
| 207 catch (IOException ignored) { | |
| 208 } | |
| 209 } | |
| 210 } | |
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211 } |