0
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1 /*
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2 * ConnectBot: simple, powerful, open-source SSH client for Android
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3 * Copyright 2007 Kenny Root, Jeffrey Sharkey
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4 *
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5 * Licensed under the Apache License, Version 2.0 (the "License");
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6 * you may not use this file except in compliance with the License.
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7 * You may obtain a copy of the License at
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8 *
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9 * http://www.apache.org/licenses/LICENSE-2.0
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10 *
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11 * Unless required by applicable law or agreed to in writing, software
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12 * distributed under the License is distributed on an "AS IS" BASIS,
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13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 * See the License for the specific language governing permissions and
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15 * limitations under the License.
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16 */
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17
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18 package com.trilead.ssh2.channel;
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19
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20 import java.io.IOException;
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21 import java.io.InputStream;
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22 import java.io.OutputStream;
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23 import java.math.BigInteger;
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24 import java.security.KeyFactory;
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25 import java.security.KeyPair;
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26 import java.security.NoSuchAlgorithmException;
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27 import java.security.PrivateKey;
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28 import java.security.PublicKey;
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29 import java.security.SecureRandom;
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30 import java.security.interfaces.DSAPrivateKey;
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31 import java.security.interfaces.RSAPrivateKey;
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32 import java.security.spec.DSAPrivateKeySpec;
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33 import java.security.spec.DSAPublicKeySpec;
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34 import java.security.spec.ECParameterSpec;
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35 import java.security.spec.ECPoint;
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36 import java.security.spec.ECPrivateKeySpec;
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37 import java.security.spec.ECPublicKeySpec;
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38 import java.security.spec.InvalidKeySpecException;
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39 import java.security.spec.KeySpec;
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40 import java.security.spec.RSAPrivateCrtKeySpec;
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41 import java.security.spec.RSAPublicKeySpec;
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42 import java.util.Map;
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43 import java.util.Map.Entry;
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44
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45 import com.trilead.ssh2.AuthAgentCallback;
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46 import com.trilead.ssh2.log.Logger;
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47 import com.trilead.ssh2.packets.TypesReader;
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48 import com.trilead.ssh2.packets.TypesWriter;
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49 import com.trilead.ssh2.signature.DSASHA1Verify;
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50 import com.trilead.ssh2.signature.ECDSASHA2Verify;
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51 import com.trilead.ssh2.signature.RSASHA1Verify;
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52
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53 /**
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54 * AuthAgentForwardThread.
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55 *
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56 * @author Kenny Root
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57 * @version $Id$
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58 */
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59 public class AuthAgentForwardThread extends Thread implements IChannelWorkerThread {
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60 private static final byte[] SSH_AGENT_FAILURE = {0, 0, 0, 1, 5}; // 5
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61 private static final byte[] SSH_AGENT_SUCCESS = {0, 0, 0, 1, 6}; // 6
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62
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63 private static final int SSH2_AGENTC_REQUEST_IDENTITIES = 11;
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64 private static final int SSH2_AGENT_IDENTITIES_ANSWER = 12;
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65
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66 private static final int SSH2_AGENTC_SIGN_REQUEST = 13;
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67 private static final int SSH2_AGENT_SIGN_RESPONSE = 14;
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68
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69 private static final int SSH2_AGENTC_ADD_IDENTITY = 17;
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70 private static final int SSH2_AGENTC_REMOVE_IDENTITY = 18;
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71 private static final int SSH2_AGENTC_REMOVE_ALL_IDENTITIES = 19;
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72
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73 // private static final int SSH_AGENTC_ADD_SMARTCARD_KEY = 20;
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74 // private static final int SSH_AGENTC_REMOVE_SMARTCARD_KEY = 21;
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75
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76 private static final int SSH_AGENTC_LOCK = 22;
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77 private static final int SSH_AGENTC_UNLOCK = 23;
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78
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79 private static final int SSH2_AGENTC_ADD_ID_CONSTRAINED = 25;
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80 // private static final int SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED = 26;
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81
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82 // Constraints for adding keys
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83 private static final int SSH_AGENT_CONSTRAIN_LIFETIME = 1;
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84 private static final int SSH_AGENT_CONSTRAIN_CONFIRM = 2;
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85
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86 // Flags for signature requests
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87 // private static final int SSH_AGENT_OLD_SIGNATURE = 1;
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88
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89 private static final Logger log = Logger.getLogger(RemoteAcceptThread.class);
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90
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91 AuthAgentCallback authAgent;
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92 OutputStream os;
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93 InputStream is;
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94 Channel c;
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95
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96 byte[] buffer = new byte[Channel.CHANNEL_BUFFER_SIZE];
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97
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98 public AuthAgentForwardThread(Channel c, AuthAgentCallback authAgent) {
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99 this.c = c;
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100 this.authAgent = authAgent;
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101
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102 if (log.isEnabled())
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103 log.log(20, "AuthAgentForwardThread started");
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104 }
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105
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106 @Override
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107 public void run() {
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108 try {
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109 c.cm.registerThread(this);
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110 }
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111 catch (IOException e) {
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112 stopWorking();
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113 return;
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114 }
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115
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116 try {
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117 c.cm.sendOpenConfirmation(c);
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118 is = c.getStdoutStream();
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119 os = c.getStdinStream();
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120 int totalSize = 4;
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121 int readSoFar = 0;
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122
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123 while (true) {
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124 int len;
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125
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126 try {
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127 len = is.read(buffer, readSoFar, buffer.length - readSoFar);
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128 }
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129 catch (IOException e) {
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130 stopWorking();
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131 return;
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132 }
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133
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134 if (len <= 0)
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135 break;
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136
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137 readSoFar += len;
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138
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139 if (readSoFar >= 4) {
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140 TypesReader tr = new TypesReader(buffer, 0, 4);
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141 totalSize = tr.readUINT32() + 4;
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142 }
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143
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144 if (totalSize == readSoFar) {
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145 TypesReader tr = new TypesReader(buffer, 4, readSoFar - 4);
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146 int messageType = tr.readByte();
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147
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148 switch (messageType) {
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149 case SSH2_AGENTC_REQUEST_IDENTITIES:
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150 sendIdentities();
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151 break;
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152
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153 case SSH2_AGENTC_ADD_IDENTITY:
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154 addIdentity(tr, false);
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155 break;
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156
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157 case SSH2_AGENTC_ADD_ID_CONSTRAINED:
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158 addIdentity(tr, true);
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159 break;
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160
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161 case SSH2_AGENTC_REMOVE_IDENTITY:
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162 removeIdentity(tr);
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163 break;
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164
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165 case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
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166 removeAllIdentities(tr);
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167 break;
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168
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169 case SSH2_AGENTC_SIGN_REQUEST:
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170 processSignRequest(tr);
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171 break;
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172
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173 case SSH_AGENTC_LOCK:
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174 processLockRequest(tr);
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175 break;
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176
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177 case SSH_AGENTC_UNLOCK:
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178 processUnlockRequest(tr);
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179 break;
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180
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181 default:
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182 os.write(SSH_AGENT_FAILURE);
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183 break;
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184 }
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185
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186 readSoFar = 0;
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187 }
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188 }
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189
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190 c.cm.closeChannel(c, "EOF on both streams reached.", true);
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191 }
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192 catch (IOException e) {
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193 log.log(50, "IOException in agent forwarder: " + e.getMessage());
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194
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195 try {
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196 is.close();
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197 }
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198 catch (IOException e1) {
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199 }
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200
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201 try {
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202 os.close();
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203 }
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204 catch (IOException e2) {
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205 }
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206
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207 try {
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208 c.cm.closeChannel(c, "IOException in agent forwarder (" + e.getMessage() + ")", true);
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209 }
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210 catch (IOException e3) {
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211 }
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212 }
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213 }
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214
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215 public void stopWorking() {
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216 try {
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217 /* This will lead to an IOException in the is.read() call */
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218 is.close();
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219 }
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220 catch (IOException e) {
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221 }
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222 }
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223
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224 /**
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225 * @return whether the agent is locked
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226 */
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227 private boolean failWhenLocked() throws IOException {
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228 if (authAgent.isAgentLocked()) {
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229 os.write(SSH_AGENT_FAILURE);
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230 return true;
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231 }
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232 else
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233 return false;
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234 }
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235
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236 private void sendIdentities() throws IOException {
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237 Map<String, byte[]> keys = null;
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238 TypesWriter tw = new TypesWriter();
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239 tw.writeByte(SSH2_AGENT_IDENTITIES_ANSWER);
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240 int numKeys = 0;
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241
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242 if (!authAgent.isAgentLocked())
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243 keys = authAgent.retrieveIdentities();
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244
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245 if (keys != null)
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246 numKeys = keys.size();
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247
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248 tw.writeUINT32(numKeys);
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249
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250 if (keys != null) {
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251 for (Entry<String, byte[]> entry : keys.entrySet()) {
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252 byte[] keyBytes = entry.getValue();
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253 tw.writeString(keyBytes, 0, keyBytes.length);
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254 tw.writeString(entry.getKey());
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255 }
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256 }
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257
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258 sendPacket(tw.getBytes());
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259 }
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260
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261 /**
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262 * @param tr
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263 */
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264 private void addIdentity(TypesReader tr, boolean checkConstraints) {
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265 try {
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266 if (failWhenLocked())
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267 return;
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268
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269 String type = tr.readString();
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270 String comment;
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271 String keyType;
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272 KeySpec pubSpec;
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273 KeySpec privSpec;
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274
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275 if (type.equals("ssh-rsa")) {
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276 keyType = "RSA";
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277 BigInteger n = tr.readMPINT();
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278 BigInteger e = tr.readMPINT();
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279 BigInteger d = tr.readMPINT();
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280 BigInteger iqmp = tr.readMPINT();
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281 BigInteger p = tr.readMPINT();
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282 BigInteger q = tr.readMPINT();
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283 comment = tr.readString();
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284 // Derive the extra values Java needs.
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285 BigInteger dmp1 = d.mod(p.subtract(BigInteger.ONE));
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286 BigInteger dmq1 = d.mod(q.subtract(BigInteger.ONE));
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287 pubSpec = new RSAPublicKeySpec(n, e);
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288 privSpec = new RSAPrivateCrtKeySpec(n, e, d, p, q, dmp1, dmq1, iqmp);
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289 }
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290 else if (type.equals("ssh-dss")) {
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291 keyType = "DSA";
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292 BigInteger p = tr.readMPINT();
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293 BigInteger q = tr.readMPINT();
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294 BigInteger g = tr.readMPINT();
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295 BigInteger y = tr.readMPINT();
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296 BigInteger x = tr.readMPINT();
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297 comment = tr.readString();
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298 pubSpec = new DSAPublicKeySpec(y, p, q, g);
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299 privSpec = new DSAPrivateKeySpec(x, p, q, g);
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300 }
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301 else if (type.equals("ecdsa-sha2-nistp256")) {
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302 keyType = "EC";
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303 String curveName = tr.readString();
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304 byte[] groupBytes = tr.readByteString();
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305 BigInteger exponent = tr.readMPINT();
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306 comment = tr.readString();
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307
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308 if (!"nistp256".equals(curveName)) {
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309 log.log(2, "Invalid curve name for ecdsa-sha2-nistp256: " + curveName);
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310 os.write(SSH_AGENT_FAILURE);
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311 return;
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312 }
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313
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314 ECParameterSpec nistp256 = ECDSASHA2Verify.EllipticCurves.nistp256;
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315 ECPoint group = ECDSASHA2Verify.decodeECPoint(groupBytes, nistp256.getCurve());
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316
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317 if (group == null) {
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318 // TODO log error
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319 os.write(SSH_AGENT_FAILURE);
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320 return;
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321 }
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322
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323 pubSpec = new ECPublicKeySpec(group, nistp256);
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324 privSpec = new ECPrivateKeySpec(exponent, nistp256);
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325 }
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326 else {
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327 log.log(2, "Unknown key type: " + type);
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328 os.write(SSH_AGENT_FAILURE);
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329 return;
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330 }
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331
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332 PublicKey pubKey;
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333 PrivateKey privKey;
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334
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335 try {
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336 KeyFactory kf = KeyFactory.getInstance(keyType);
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337 pubKey = kf.generatePublic(pubSpec);
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338 privKey = kf.generatePrivate(privSpec);
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339 }
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340 catch (NoSuchAlgorithmException ex) {
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341 // TODO: log error
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342 os.write(SSH_AGENT_FAILURE);
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343 return;
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344 }
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345 catch (InvalidKeySpecException ex) {
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346 // TODO: log error
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347 os.write(SSH_AGENT_FAILURE);
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348 return;
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349 }
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350
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351 KeyPair pair = new KeyPair(pubKey, privKey);
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352 boolean confirmUse = false;
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353 int lifetime = 0;
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354
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355 if (checkConstraints) {
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356 while (tr.remain() > 0) {
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357 int constraint = tr.readByte();
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358
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359 if (constraint == SSH_AGENT_CONSTRAIN_CONFIRM)
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360 confirmUse = true;
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361 else if (constraint == SSH_AGENT_CONSTRAIN_LIFETIME)
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362 lifetime = tr.readUINT32();
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363 else {
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364 // Unknown constraint. Bail.
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365 os.write(SSH_AGENT_FAILURE);
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366 return;
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367 }
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368 }
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369 }
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370
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371 if (authAgent.addIdentity(pair, comment, confirmUse, lifetime))
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372 os.write(SSH_AGENT_SUCCESS);
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373 else
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374 os.write(SSH_AGENT_FAILURE);
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375 }
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376 catch (IOException e) {
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377 try {
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378 os.write(SSH_AGENT_FAILURE);
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379 }
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380 catch (IOException e1) {
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381 }
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382 }
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383 }
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384
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385 /**
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386 * @param tr
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387 */
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388 private void removeIdentity(TypesReader tr) {
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389 try {
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390 if (failWhenLocked())
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391 return;
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392
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393 byte[] publicKey = tr.readByteString();
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394
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395 if (authAgent.removeIdentity(publicKey))
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396 os.write(SSH_AGENT_SUCCESS);
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397 else
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398 os.write(SSH_AGENT_FAILURE);
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399 }
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400 catch (IOException e) {
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401 try {
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402 os.write(SSH_AGENT_FAILURE);
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403 }
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404 catch (IOException e1) {
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405 }
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406 }
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407 }
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408
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409 /**
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410 * @param tr
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411 */
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412 private void removeAllIdentities(TypesReader tr) {
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413 try {
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414 if (failWhenLocked())
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415 return;
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416
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417 if (authAgent.removeAllIdentities())
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418 os.write(SSH_AGENT_SUCCESS);
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419 else
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420 os.write(SSH_AGENT_FAILURE);
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421 }
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422 catch (IOException e) {
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423 try {
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424 os.write(SSH_AGENT_FAILURE);
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425 }
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426 catch (IOException e1) {
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427 }
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428 }
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429 }
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430
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431 private void processSignRequest(TypesReader tr) {
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432 try {
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433 if (failWhenLocked())
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434 return;
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435
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436 byte[] publicKeyBytes = tr.readByteString();
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437 byte[] challenge = tr.readByteString();
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438 int flags = tr.readUINT32();
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439
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440 if (flags != 0) {
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441 // We don't understand any flags; abort!
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442 os.write(SSH_AGENT_FAILURE);
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443 return;
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444 }
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445
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446 KeyPair pair = authAgent.getKeyPair(publicKeyBytes);
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447
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448 if (pair == null) {
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449 os.write(SSH_AGENT_FAILURE);
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450 return;
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451 }
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452
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453 byte[] response;
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454 PrivateKey privKey = pair.getPrivate();
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455
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456 if (privKey instanceof RSAPrivateKey) {
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457 byte[] signature = RSASHA1Verify.generateSignature(challenge,
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458 (RSAPrivateKey) privKey);
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459 response = RSASHA1Verify.encodeSSHRSASignature(signature);
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460 }
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461 else if (privKey instanceof DSAPrivateKey) {
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462 byte[] signature = DSASHA1Verify.generateSignature(challenge,
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463 (DSAPrivateKey) privKey, new SecureRandom());
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464 response = DSASHA1Verify.encodeSSHDSASignature(signature);
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465 }
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466 else {
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467 os.write(SSH_AGENT_FAILURE);
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468 return;
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469 }
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470
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471 TypesWriter tw = new TypesWriter();
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472 tw.writeByte(SSH2_AGENT_SIGN_RESPONSE);
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473 tw.writeString(response, 0, response.length);
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474 sendPacket(tw.getBytes());
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475 }
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476 catch (IOException e) {
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477 try {
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478 os.write(SSH_AGENT_FAILURE);
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479 }
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480 catch (IOException e1) {
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481 }
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482 }
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483 }
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484
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485 /**
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486 * @param tr
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487 */
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488 private void processLockRequest(TypesReader tr) {
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489 try {
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490 if (failWhenLocked())
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491 return;
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492
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493 String lockPassphrase = tr.readString();
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494
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495 if (!authAgent.setAgentLock(lockPassphrase)) {
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496 os.write(SSH_AGENT_FAILURE);
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497 return;
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498 }
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499 else
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500 os.write(SSH_AGENT_SUCCESS);
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501 }
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502 catch (IOException e) {
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503 try {
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504 os.write(SSH_AGENT_FAILURE);
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505 }
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506 catch (IOException e1) {
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507 }
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508 }
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509 }
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510
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511 /**
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512 * @param tr
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513 */
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514 private void processUnlockRequest(TypesReader tr) {
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515 try {
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516 String unlockPassphrase = tr.readString();
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517
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518 if (authAgent.requestAgentUnlock(unlockPassphrase))
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519 os.write(SSH_AGENT_SUCCESS);
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520 else
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521 os.write(SSH_AGENT_FAILURE);
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522 }
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523 catch (IOException e) {
|
|
524 try {
|
|
525 os.write(SSH_AGENT_FAILURE);
|
|
526 }
|
|
527 catch (IOException e1) {
|
|
528 }
|
|
529 }
|
|
530 }
|
|
531
|
|
532 /**
|
|
533 * @param tw
|
|
534 * @throws IOException
|
|
535 */
|
|
536 private void sendPacket(byte[] message) throws IOException {
|
|
537 TypesWriter packet = new TypesWriter();
|
|
538 packet.writeUINT32(message.length);
|
|
539 packet.writeBytes(message);
|
|
540 os.write(packet.getBytes());
|
|
541 }
|
|
542 }
|