Mercurial > 510Connectbot
annotate app/src/main/java/ch/ethz/ssh2/ServerConnection.java @ 500:11d714165a2d
updates for android10+
| author | Carl Byington <carl@five-ten-sg.com> |
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| date | Tue, 07 Jun 2022 16:10:58 -0700 |
| parents | d29cce60f393 |
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| rev | line source |
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1 /* |
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2 * Copyright (c) 2012-2013 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 |
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6 package ch.ethz.ssh2; |
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7 |
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8 import java.io.CharArrayWriter; |
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9 import java.io.File; |
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10 import java.io.FileReader; |
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11 import java.io.IOException; |
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12 import java.net.Socket; |
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13 import java.util.List; |
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14 import java.util.ArrayList; |
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15 |
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16 import ch.ethz.ssh2.crypto.CryptoWishList; |
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17 import ch.ethz.ssh2.crypto.PEMDecoder; |
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18 import ch.ethz.ssh2.server.ServerConnectionState; |
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19 import java.security.KeyPair; |
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20 import java.security.PrivateKey; |
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21 import java.security.interfaces.DSAPrivateKey; |
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22 import java.security.interfaces.ECPrivateKey; |
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23 import java.security.interfaces.RSAPrivateKey; |
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24 import ch.ethz.ssh2.transport.ServerTransportManager; |
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25 |
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26 /** |
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27 * A server-side SSH-2 connection. |
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28 * |
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29 * @author Christian |
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30 * |
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31 */ |
| 307 | 32 public class ServerConnection { |
| 33 /** | |
| 34 * The softwareversion presented to the SSH-2 client. | |
| 35 */ | |
| 36 private String softwareversion = String.format("Ganymed_SSHD_%s", Version.getSpecification()); | |
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37 |
| 307 | 38 private final ServerConnectionState state = new ServerConnectionState(this); |
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39 |
| 307 | 40 /** |
| 41 * Creates a new <code>ServerConnection</code> that will communicate | |
| 42 * with the client over the given <code>Socket</code>. | |
| 43 * <p> | |
| 44 * Note: you need to call {@link #connect()} or {@link #connect(int)} to | |
| 45 * perform the initial handshake and establish the encrypted communication. | |
| 46 * | |
| 47 * @see #connect(int) | |
| 48 * | |
| 49 * @param s The socket | |
| 50 */ | |
| 51 public ServerConnection(Socket s) { | |
| 52 this(s, null, null, null); | |
| 53 } | |
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54 |
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55 public ServerConnection(Socket s, String softwareversion) { |
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56 this(s, null, null, null); |
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57 this.softwareversion = softwareversion; |
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58 } |
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59 |
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60 /** |
| 307 | 61 * Creates a new <code>ServerConnection</code> that will communicate |
| 62 * with the client over the given <code>Socket</code>. | |
| 63 * <p> | |
| 64 * Note: you need to call {@link #connect()} or {@link #connect(int)} to | |
| 65 * perform the initial handshake and establish the encrypted communication. | |
| 66 * <p> | |
| 67 * Please read the javadoc for the {@link #connect(int)} method. | |
| 68 * | |
| 69 * @see #connect(int) | |
| 70 * | |
| 71 * @param s The socket | |
| 72 * @param dsa_key The DSA hostkey, may be <code>NULL</code> | |
| 73 * @param rsa_key The RSA hostkey, may be <code>NULL</code> | |
| 74 * @param ec_key The EC hostkey, may be <code>NULL</code> | |
| 75 */ | |
| 76 public ServerConnection(Socket s, KeyPair dsa_key, KeyPair rsa_key, KeyPair ec_key) { | |
| 77 state.s = s; | |
| 78 state.softwareversion = softwareversion; | |
| 79 state.next_dsa_key = dsa_key; | |
| 80 state.next_rsa_key = rsa_key; | |
| 81 state.next_ec_key = ec_key; | |
| 82 fixCryptoWishList(state.next_cryptoWishList, state.next_dsa_key, state.next_rsa_key, state.next_ec_key); | |
| 83 } | |
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84 |
| 307 | 85 /** |
| 86 * Establish the connection and block until the first handshake has completed. | |
| 87 * <p> | |
| 88 * Note: this is a wrapper that calls <code>connect(0)</code> (i.e., connect with no timeout). | |
| 89 * <p> | |
| 90 * Please read the javadoc for the {@link #connect(int)} method. | |
| 91 * | |
| 92 * @see #connect(int) | |
| 93 * | |
| 94 * @throws IOException | |
| 95 */ | |
| 96 | |
| 97 public synchronized void connect() throws IOException { | |
| 98 connect(0); | |
| 99 } | |
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100 |
| 307 | 101 /** |
| 102 * Establish the connection and block until the first handshake has completed. | |
| 103 * <p> | |
| 104 * Note 1: at least one DSA, RSA or EC hostkey must be set before calling this method. | |
| 105 * <p> | |
| 106 * Note 2: You must set the callbacks for authentication ({@link #setAuthenticationCallback(ServerAuthenticationCallback)}) | |
| 107 * and connection events ({@link #setServerConnectionCallback(ServerConnectionCallback)}). | |
| 108 * | |
| 109 * @see #setPEMHostKey(char[], String) | |
| 110 * @see #setPEMHostKey(File, String) | |
| 111 * @see #setRsaHostKey(RSAPrivateKey) | |
| 112 * @see #setDsaHostKey(DSAPrivateKey) | |
| 113 * | |
| 114 * @param timeout_milliseconds Timeout in milliseconds, <code>0</code> means no timeout. | |
| 115 * @throws IOException | |
| 116 */ | |
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117 |
| 307 | 118 public synchronized void connect(int timeout_milliseconds) throws IOException { |
| 119 synchronized (state) { | |
| 120 if (state.cb_conn == null) | |
| 121 throw new IllegalStateException("The callback for connection events has not been set."); | |
| 122 | |
| 123 if (state.cb_auth == null) | |
| 124 throw new IllegalStateException("The callback for authentication events has not been set."); | |
| 125 | |
| 126 if (state.tm != null) | |
| 127 throw new IllegalStateException("The initial handshake has already been started."); | |
| 128 | |
| 129 if ((state.next_dsa_key == null) && (state.next_rsa_key == null) && (state.next_ec_key == null)) | |
| 130 throw new IllegalStateException("Neither an RSA nor a DSA nor an EC host key has been specified!"); | |
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131 |
| 307 | 132 state.tm = new ServerTransportManager(state.s); |
| 133 } | |
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134 |
| 307 | 135 state.tm.connect(state); |
| 136 /* Wait until first KEX has finished */ | |
| 137 state.tm.getConnectionInfo(1); | |
| 138 } | |
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139 |
| 307 | 140 /** |
| 141 * Retrieve the underlying socket. | |
| 142 * | |
| 143 * @return the socket that has been passed to the constructor. | |
| 144 */ | |
| 145 public Socket getSocket() { | |
| 146 return state.s; | |
| 147 } | |
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148 |
| 307 | 149 /** |
| 150 * Force an asynchronous key re-exchange (the call does not block). The | |
| 151 * latest values set for MAC, Cipher and DH group exchange parameters will | |
| 152 * be used. If a key exchange is currently in progress, then this method has | |
| 153 * the only effect that the so far specified parameters will be used for the | |
| 154 * next (client driven) key exchange. You may call this method only after | |
| 155 * the initial key exchange has been established. | |
| 156 * <p> | |
| 157 * Note: This implementation will never start automatically a key exchange (other than the initial one) | |
| 158 * unless you or the connected SSH-2 client ask for it. | |
| 159 * | |
| 160 * @throws IOException | |
| 161 * In case of any failure behind the scenes. | |
| 162 */ | |
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163 |
| 307 | 164 public synchronized void forceKeyExchange() throws IOException { |
| 165 synchronized (state) { | |
| 166 if (state.tm == null) | |
| 167 throw new IllegalStateException( | |
| 168 "Cannot force another key exchange, you need to start the key exchange first."); | |
| 169 | |
| 170 state.tm.forceKeyExchange(state.next_cryptoWishList, null, state.next_dsa_key, state.next_rsa_key, state.next_ec_key); | |
| 171 } | |
| 172 } | |
| 173 | |
| 174 /** | |
| 175 * Returns a {@link ConnectionInfo} object containing the details of | |
| 176 * the connection. May be called as soon as the first key exchange has been | |
| 177 * started. The method blocks in case the first key exchange has not been completed. | |
| 178 * <p> | |
| 179 * Note: upon return of this method, authentication may still be pending. | |
| 180 * | |
| 181 * @return A {@link ConnectionInfo} object. | |
| 182 * @throws IOException | |
| 183 * In case of any failure behind the scenes; e.g., first key exchange was aborted. | |
| 184 */ | |
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185 |
| 307 | 186 public synchronized ConnectionInfo getConnectionInfo() throws IOException { |
| 187 synchronized (state) { | |
| 188 if (state.tm == null) | |
| 189 throw new IllegalStateException( | |
| 190 "Cannot get details of connection, you need to start the key exchange first."); | |
| 191 } | |
| 192 | |
| 193 return state.tm.getConnectionInfo(1); | |
| 194 } | |
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195 |
| 307 | 196 /** |
| 197 * Change the current DSA hostkey. Either a DSA or RSA or EC private key must be set for a successful handshake with | |
| 198 * the client. | |
| 199 * <p> | |
| 200 * Note: You can change an existing DSA hostkey after the initial kex exchange (the new value will | |
| 201 * be used during the next server initiated key exchange), but you cannot remove (i.e., set to <code>null</code>) the | |
| 202 * current DSA key, otherwise the next key exchange may fail in case the client supports only DSA hostkeys. | |
| 203 * | |
| 204 * @param dsa_hostkey | |
| 205 */ | |
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206 |
| 307 | 207 public synchronized void setDsaHostKey(KeyPair dsa_hostkey) { |
| 208 synchronized (state) { | |
| 209 if ((dsa_hostkey == null) && (state.next_dsa_key != null) && (state.tm != null)) | |
| 210 throw new IllegalStateException("Cannot remove DSA hostkey after first key exchange."); | |
| 211 | |
| 212 state.next_dsa_key = dsa_hostkey; | |
| 213 fixCryptoWishList(state.next_cryptoWishList, state.next_dsa_key, state.next_rsa_key, state.next_ec_key); | |
| 214 } | |
| 215 } | |
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216 |
| 307 | 217 /** |
| 218 * Change the current RSA hostkey. Either a DSA or RSA or EC private key must be set for a successful handshake with | |
| 219 * the client. | |
| 220 * <p> | |
| 221 * Note: You can change an existing RSA hostkey after the initial kex exchange (the new value will | |
| 222 * be used during the next server initiated key exchange), but you cannot remove (i.e., set to <code>null</code>) the | |
| 223 * current RSA key, otherwise the next key exchange may fail in case the client supports only RSA hostkeys. | |
| 224 * | |
| 225 * @param rsa_hostkey | |
| 226 */ | |
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227 |
| 307 | 228 public synchronized void setRsaHostKey(KeyPair rsa_hostkey) { |
| 229 synchronized (state) { | |
| 230 if ((rsa_hostkey == null) && (state.next_rsa_key != null) && (state.tm != null)) | |
| 231 throw new IllegalStateException("Cannot remove RSA hostkey after first key exchange."); | |
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232 |
| 307 | 233 state.next_rsa_key = rsa_hostkey; |
| 234 fixCryptoWishList(state.next_cryptoWishList, state.next_dsa_key, state.next_rsa_key, state.next_ec_key); | |
| 235 } | |
| 236 } | |
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237 |
| 307 | 238 /** |
| 239 * Change the current EC hostkey. Either a DSA or RSA or EC private key must be set for a successful handshake with | |
| 240 * the client. | |
| 241 * <p> | |
| 242 * Note: You can change an existing EC hostkey after the initial kex exchange (the new value will | |
| 243 * be used during the next server initiated key exchange), but you cannot remove (i.e., set to <code>null</code>) the | |
| 244 * current EC key, otherwise the next key exchange may fail in case the client supports only EC hostkeys. | |
| 245 * | |
| 246 * @param rsa_hostkey | |
| 247 */ | |
| 248 | |
| 249 public synchronized void setEcHostKey(KeyPair ec_hostkey) { | |
| 250 synchronized (state) { | |
| 251 if ((ec_hostkey == null) && (state.next_ec_key != null) && (state.tm != null)) | |
| 252 throw new IllegalStateException("Cannot remove EC hostkey after first key exchange."); | |
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253 |
| 307 | 254 state.next_ec_key = ec_hostkey; |
| 255 fixCryptoWishList(state.next_cryptoWishList, state.next_dsa_key, state.next_rsa_key, state.next_ec_key); | |
| 256 } | |
| 257 } | |
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258 |
| 307 | 259 /** |
| 260 * Utility method that loads a PEM based hostkey (either RSA or DSA based) and | |
| 261 * calls either <code>setRsaHostKey()</code> or <code>setDsaHostKey()</code>. | |
| 262 * | |
| 263 * @param pemdata The PEM data | |
| 264 * @param password Password, may be null in case the PEM data is not password protected | |
| 265 * @throws IOException In case of any error. | |
| 266 */ | |
| 267 public void setPEMHostKey(char[] pemdata, String password) throws IOException { | |
| 268 KeyPair pair = PEMDecoder.decode(pemdata, password); | |
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269 PrivateKey key = pair.getPrivate(); |
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270 |
| 307 | 271 if (key instanceof DSAPrivateKey) setDsaHostKey(pair); |
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272 |
| 307 | 273 if (key instanceof RSAPrivateKey) setRsaHostKey(pair); |
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274 |
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275 if (key instanceof ECPrivateKey) setEcHostKey(pair); |
| 307 | 276 } |
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277 |
| 307 | 278 /** |
| 279 * Utility method that loads a hostkey from a PEM file (either RSA or DSA based) and | |
| 280 * calls either <code>setRsaHostKey()</code> or <code>setDsaHostKey()</code>. | |
| 281 * | |
| 282 * @param pemFile The PEM file | |
| 283 * @param password Password, may be null in case the PEM file is not password protected | |
| 284 * @throws IOException | |
| 285 */ | |
| 286 public void setPEMHostKey(File pemFile, String password) throws IOException { | |
| 287 if (pemFile == null) | |
| 288 throw new IllegalArgumentException("pemfile argument is null"); | |
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289 |
| 307 | 290 char[] buff = new char[256]; |
| 291 CharArrayWriter cw = new CharArrayWriter(); | |
| 292 FileReader fr = new FileReader(pemFile); | |
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293 |
| 307 | 294 while (true) { |
| 295 int len = fr.read(buff); | |
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296 |
| 307 | 297 if (len < 0) |
| 298 break; | |
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299 |
| 307 | 300 cw.write(buff, 0, len); |
| 301 } | |
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302 |
| 307 | 303 fr.close(); |
| 304 setPEMHostKey(cw.toCharArray(), password); | |
| 305 } | |
| 306 | |
| 307 private void fixCryptoWishList(CryptoWishList next_cryptoWishList, KeyPair next_dsa_key, KeyPair next_rsa_key, KeyPair next_ec_key) { | |
| 308 List<String> algos = new ArrayList<String>(); | |
| 309 | |
|
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310 if (next_rsa_key != null) algos.add("ssh-rsa"); |
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311 if (next_dsa_key != null) algos.add("ssh-dss"); |
| 307 | 312 if (next_ec_key != null) algos.add("ecdsa-sha2-nistp521"); |
| 313 if (next_ec_key != null) algos.add("ecdsa-sha2-nistp384"); | |
| 314 if (next_ec_key != null) algos.add("ecdsa-sha2-nistp256"); | |
| 315 | |
| 316 next_cryptoWishList.serverHostKeyAlgorithms = new String[algos.size()]; | |
|
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317 algos.toArray(next_cryptoWishList.serverHostKeyAlgorithms); |
| 307 | 318 } |
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319 |
| 307 | 320 /** |
| 321 * Callback interface with methods that will be called upon events | |
| 322 * generated by the client (e.g., client opens a new Session which results in a <code>ServerSession</code>). | |
| 323 * <p> | |
| 324 * Note: This must be set before the first handshake. | |
| 325 * | |
| 326 * @param cb The callback implementation | |
| 327 */ | |
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328 |
| 307 | 329 public synchronized void setServerConnectionCallback(ServerConnectionCallback cb) { |
| 330 synchronized (state) { | |
| 331 state.cb_conn = cb; | |
| 332 } | |
| 333 } | |
| 334 | |
| 335 /** | |
| 336 * Callback interface with methods that will be called upon authentication events. | |
| 337 * <p> | |
| 338 * Note: This must be set before the first handshake. | |
| 339 * | |
| 340 * @param cb The callback implementation | |
| 341 */ | |
| 342 | |
| 343 public synchronized void setAuthenticationCallback(ServerAuthenticationCallback cb) { | |
| 344 synchronized (state) { | |
| 345 state.cb_auth = cb; | |
| 346 } | |
| 347 } | |
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348 |
| 307 | 349 /** |
| 350 * Close the connection to the SSH-2 server. All assigned sessions will be | |
| 351 * closed, too. Can be called at any time. Don't forget to call this once | |
| 352 * you don't need a connection anymore - otherwise the receiver thread may | |
| 353 * run forever. | |
| 354 */ | |
| 355 public void close() { | |
| 356 synchronized (state) { | |
| 357 if (state.cm != null) | |
| 358 state.cm.closeAllChannels(); | |
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359 |
| 307 | 360 if (state.tm != null) { |
|
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361 state.tm.close(new Throwable("Closed due to user request."), false); |
| 307 | 362 } |
| 363 } | |
| 364 } | |
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365 |
| 307 | 366 public void close(IOException t) { |
| 367 synchronized (state) { | |
| 368 if (state.cm != null) | |
| 369 state.cm.closeAllChannels(); | |
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370 |
| 307 | 371 if (state.tm != null) { |
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372 state.tm.close(t, false); |
| 307 | 373 } |
| 374 } | |
| 375 } | |
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376 } |