Mercurial > 510Connectbot
annotate app/src/main/java/ch/ethz/ssh2/transport/TransportConnection.java @ 474:e5f8d879543f
add fg/bg color setting to global:// section of deployment.connections file
author | Carl Byington <carl@five-ten-sg.com> |
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date | Sun, 20 Oct 2019 14:08:00 -0700 |
parents | d29cce60f393 |
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rev | line source |
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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.transport; |
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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.security.SecureRandom; |
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11 |
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12 import ch.ethz.ssh2.PacketFormatException; |
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13 import ch.ethz.ssh2.compression.Compressor; |
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14 import ch.ethz.ssh2.crypto.cipher.BlockCipher; |
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15 import ch.ethz.ssh2.crypto.cipher.CipherInputStream; |
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16 import ch.ethz.ssh2.crypto.cipher.CipherOutputStream; |
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17 import ch.ethz.ssh2.crypto.cipher.NullCipher; |
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18 import ch.ethz.ssh2.crypto.digest.MAC; |
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19 import ch.ethz.ssh2.log.Logger; |
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20 import ch.ethz.ssh2.packets.Packets; |
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21 |
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22 /** |
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23 * TransportConnection. |
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24 * |
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25 * @author Christian Plattner |
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26 * @version $Id: TransportConnection.java 144 2014-04-25 12:48:25Z dkocher@sudo.ch $ |
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27 */ |
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28 public class TransportConnection { |
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29 private static final Logger log = Logger.getLogger(TransportConnection.class); |
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30 |
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31 int send_seq_number = 0; |
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32 |
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33 int recv_seq_number = 0; |
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34 |
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35 CipherInputStream cis; |
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36 |
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37 CipherOutputStream cos; |
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38 |
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39 boolean useRandomPadding; |
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40 |
307 | 41 /* Depends on current MAC and CIPHER */ |
273
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42 |
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43 MAC send_mac; |
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44 |
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45 byte[] send_mac_buffer; |
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46 |
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47 int send_padd_blocksize = 8; |
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48 |
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49 MAC recv_mac; |
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50 |
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51 byte[] recv_mac_buffer; |
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52 |
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53 byte[] recv_mac_buffer_cmp; |
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54 |
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55 int recv_padd_blocksize = 8; |
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56 |
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57 Compressor recv_comp; |
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58 |
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59 Compressor send_comp; |
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60 |
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61 boolean can_compress; |
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62 |
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63 byte[] recv_comp_buffer; |
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64 |
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65 byte[] send_comp_buffer; |
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66 |
307 | 67 /* won't change */ |
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68 |
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69 final byte[] send_padding_buffer = new byte[256]; |
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70 |
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71 final byte[] send_packet_header_buffer = new byte[5]; |
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72 |
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73 final byte[] recv_padding_buffer = new byte[256]; |
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74 |
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75 final byte[] recv_packet_header_buffer = new byte[5]; |
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76 |
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77 boolean recv_packet_header_present = false; |
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78 |
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79 ClientServerHello csh; |
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80 |
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81 final SecureRandom rnd; |
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82 |
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83 public TransportConnection(InputStream is, OutputStream os, SecureRandom rnd) { |
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84 this.cis = new CipherInputStream(new NullCipher(), is); |
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85 this.cos = new CipherOutputStream(new NullCipher(), os); |
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86 this.rnd = rnd; |
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87 } |
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88 |
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89 public void changeRecvCipher(BlockCipher bc, MAC mac) { |
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90 cis.changeCipher(bc); |
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91 recv_mac = mac; |
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92 recv_mac_buffer = (mac != null) ? new byte[mac.size()] : null; |
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93 recv_mac_buffer_cmp = (mac != null) ? new byte[mac.size()] : null; |
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94 recv_padd_blocksize = bc.getBlockSize(); |
307 | 95 |
96 if (recv_padd_blocksize < 8) { | |
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97 recv_padd_blocksize = 8; |
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98 } |
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99 } |
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100 |
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101 public void changeSendCipher(BlockCipher bc, MAC mac) { |
307 | 102 if ((bc instanceof NullCipher) == false) { |
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103 /* Only use zero byte padding for the first few packets */ |
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104 useRandomPadding = true; |
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105 /* Once we start encrypting, there is no way back */ |
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106 } |
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107 |
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108 cos.changeCipher(bc); |
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109 send_mac = mac; |
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110 send_mac_buffer = (mac != null) ? new byte[mac.size()] : null; |
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111 send_padd_blocksize = bc.getBlockSize(); |
307 | 112 |
113 if (send_padd_blocksize < 8) { | |
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114 send_padd_blocksize = 8; |
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115 } |
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116 } |
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117 |
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118 public void changeRecvCompression(Compressor comp) { |
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119 recv_comp = comp; |
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120 |
307 | 121 if (comp != null) { |
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122 recv_comp_buffer = new byte[comp.getBufferSize()]; |
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123 } |
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124 } |
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125 |
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126 public void changeSendCompression(Compressor comp) { |
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127 send_comp = comp; |
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128 |
307 | 129 if (comp != null) { |
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130 send_comp_buffer = new byte[comp.getBufferSize()]; |
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131 } |
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132 } |
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133 |
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134 public void sendMessage(byte[] message) throws IOException { |
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135 sendMessage(message, 0, message.length, 0); |
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136 } |
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137 |
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138 public void sendMessage(byte[] message, int off, int len) throws IOException { |
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139 sendMessage(message, off, len, 0); |
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140 } |
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141 |
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142 public int getPacketOverheadEstimate() { |
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143 // return an estimate for the paket overhead (for send operations) |
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144 return 5 + 4 + (send_padd_blocksize - 1) + send_mac_buffer.length; |
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145 } |
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146 |
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147 public void sendMessage(byte[] message, int off, int len, int padd) throws IOException { |
307 | 148 if (padd < 4) { |
273
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149 padd = 4; |
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150 } |
307 | 151 else if (padd > 64) { |
273
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152 padd = 64; |
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153 } |
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154 |
307 | 155 if (send_comp != null && can_compress) { |
273
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156 len = send_comp.compress(message, off, len, send_comp_buffer); |
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157 message = send_comp_buffer; |
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158 } |
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159 |
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160 int packet_len = 5 + len + padd; /* Minimum allowed padding is 4 */ |
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161 int slack = packet_len % send_padd_blocksize; |
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162 |
307 | 163 if (slack != 0) { |
273
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164 packet_len += (send_padd_blocksize - slack); |
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165 } |
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166 |
307 | 167 if (packet_len < 16) { |
273
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168 packet_len = 16; |
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169 } |
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170 |
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171 int padd_len = packet_len - (5 + len); |
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172 |
307 | 173 if (useRandomPadding) { |
174 for (int i = 0; i < padd_len; i = i + 4) { | |
273
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175 /* |
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176 * don't waste calls to rnd.nextInt() (by using only 8bit of the |
307 | 177 * output). just believe me: even though we may write here up to 3 |
178 * bytes which won't be used, there is no "buffer overflow" (i.e., | |
179 * arrayindexoutofbounds). the padding buffer is big enough =) (256 | |
180 * bytes, and that is bigger than any current cipher block size + 64). | |
181 */ | |
273
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182 int r = rnd.nextInt(); |
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183 send_padding_buffer[i] = (byte) r; |
307 | 184 send_padding_buffer[i + 1] = (byte)(r >> 8); |
185 send_padding_buffer[i + 2] = (byte)(r >> 16); | |
186 send_padding_buffer[i + 3] = (byte)(r >> 24); | |
273
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187 } |
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188 } |
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189 else { |
307 | 190 /* use zero padding for unencrypted traffic */ |
191 for (int i = 0; i < padd_len; i++) { | |
273
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192 send_padding_buffer[i] = 0; |
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193 } |
307 | 194 |
195 /* Actually this code is paranoid: we never filled any | |
196 * bytes into the padding buffer so far, therefore it should | |
197 * consist of zeros only. | |
198 */ | |
273
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199 } |
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200 |
307 | 201 send_packet_header_buffer[0] = (byte)((packet_len - 4) >> 24); |
202 send_packet_header_buffer[1] = (byte)((packet_len - 4) >> 16); | |
203 send_packet_header_buffer[2] = (byte)((packet_len - 4) >> 8); | |
204 send_packet_header_buffer[3] = (byte)((packet_len - 4)); | |
273
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205 send_packet_header_buffer[4] = (byte) padd_len; |
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206 cos.write(send_packet_header_buffer, 0, 5); |
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207 cos.write(message, off, len); |
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208 cos.write(send_padding_buffer, 0, padd_len); |
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209 |
307 | 210 if (send_mac != null) { |
273
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211 send_mac.initMac(send_seq_number); |
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212 send_mac.update(send_packet_header_buffer, 0, 5); |
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213 send_mac.update(message, off, len); |
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214 send_mac.update(send_padding_buffer, 0, padd_len); |
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215 send_mac.getMac(send_mac_buffer, 0); |
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216 cos.writePlain(send_mac_buffer, 0, send_mac_buffer.length); |
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217 } |
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218 |
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219 cos.flush(); |
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220 |
307 | 221 if (log.isDebugEnabled()) { |
273
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222 log.debug("Sent " + Packets.getMessageName(message[off] & 0xff) + " " + len + " bytes payload"); |
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223 } |
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224 |
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225 send_seq_number++; |
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226 } |
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227 |
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228 public int peekNextMessageLength() throws IOException { |
307 | 229 if (recv_packet_header_present == false) { |
273
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230 cis.read(recv_packet_header_buffer, 0, 5); |
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231 recv_packet_header_present = true; |
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232 } |
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233 |
372 | 234 int packet_length = ((recv_packet_header_buffer[0] & 0xff) << 24) | |
235 ((recv_packet_header_buffer[1] & 0xff) << 16) | | |
236 ((recv_packet_header_buffer[2] & 0xff) << 8) | | |
237 ((recv_packet_header_buffer[3] & 0xff)); | |
273
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238 int padding_length = recv_packet_header_buffer[4] & 0xff; |
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239 |
307 | 240 if (packet_length > TransportManager.MAX_PACKET_SIZE || packet_length < 12) { |
273
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241 throw new PacketFormatException(String.format("Illegal packet size (%d)", packet_length)); |
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242 } |
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|
243 |
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|
244 int payload_length = packet_length - padding_length - 1; |
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245 |
307 | 246 if (payload_length < 0) { |
273
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247 throw new PacketFormatException(String.format("Illegal padding_length in packet from remote (%d)", padding_length)); |
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248 } |
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|
249 |
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250 return payload_length; |
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|
251 } |
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|
252 |
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|
253 public int receiveMessage(byte buffer[], int off, int len) throws IOException { |
307 | 254 if (recv_packet_header_present == false) { |
273
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diff
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|
255 cis.read(recv_packet_header_buffer, 0, 5); |
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|
256 } |
91a31873c42a
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|
257 else { |
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|
258 recv_packet_header_present = false; |
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|
259 } |
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|
260 |
372 | 261 int packet_length = ((recv_packet_header_buffer[0] & 0xff) << 24) | |
262 ((recv_packet_header_buffer[1] & 0xff) << 16) | | |
263 ((recv_packet_header_buffer[2] & 0xff) << 8) | | |
264 ((recv_packet_header_buffer[3] & 0xff)); | |
273
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|
265 int padding_length = recv_packet_header_buffer[4] & 0xff; |
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266 |
307 | 267 if (packet_length > TransportManager.MAX_PACKET_SIZE || packet_length < 12) { |
268 throw new PacketFormatException(String.format("Illegal packet size (%d)", packet_length)); | |
273
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|
269 } |
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|
270 |
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|
271 int payload_length = packet_length - padding_length - 1; |
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|
272 |
307 | 273 if (payload_length < 0) { |
273
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274 throw new PacketFormatException(String.format("Illegal padding_length in packet from remote (%d)", padding_length)); |
91a31873c42a
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|
275 } |
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|
276 |
307 | 277 if (payload_length >= len) { |
273
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|
278 throw new IOException("Receive buffer too small (" + len + ", need " + payload_length + ")"); |
91a31873c42a
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|
279 } |
91a31873c42a
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|
280 |
91a31873c42a
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|
281 cis.read(buffer, off, payload_length); |
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diff
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|
282 cis.read(recv_padding_buffer, 0, padding_length); |
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|
283 |
307 | 284 if (recv_mac != null) { |
273
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diff
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|
285 cis.readPlain(recv_mac_buffer, 0, recv_mac_buffer.length); |
91a31873c42a
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diff
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|
286 recv_mac.initMac(recv_seq_number); |
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diff
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|
287 recv_mac.update(recv_packet_header_buffer, 0, 5); |
91a31873c42a
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diff
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|
288 recv_mac.update(buffer, off, payload_length); |
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diff
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|
289 recv_mac.update(recv_padding_buffer, 0, padding_length); |
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diff
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|
290 recv_mac.getMac(recv_mac_buffer_cmp, 0); |
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diff
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|
291 |
307 | 292 for (int i = 0; i < recv_mac_buffer.length; i++) { |
293 if (recv_mac_buffer[i] != recv_mac_buffer_cmp[i]) { | |
273
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diff
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|
294 throw new IOException("Remote sent corrupt MAC."); |
91a31873c42a
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diff
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|
295 } |
91a31873c42a
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diff
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|
296 } |
91a31873c42a
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|
297 } |
91a31873c42a
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298 |
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299 recv_seq_number++; |
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300 |
307 | 301 if (log.isDebugEnabled()) { |
273
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302 log.debug("Received " + Packets.getMessageName(buffer[off] & 0xff) + " " + payload_length |
307 | 303 + " bytes payload"); |
273
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304 } |
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305 |
307 | 306 if (recv_comp != null && can_compress) { |
307 int[] uncomp_len = new int[] {payload_length}; | |
273
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308 buffer = recv_comp.uncompress(buffer, off, uncomp_len); |
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309 return uncomp_len[0]; |
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310 } |
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311 else { |
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312 return payload_length; |
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313 } |
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314 } |
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315 |
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316 public void startCompression() { |
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317 can_compress = true; |
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318 } |
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319 } |