-/*
- * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
- * Please refer to the LICENSE.txt for licensing details.
- */
-
-package ch.ethz.ssh2;
-
-import java.io.CharArrayWriter;
-import java.io.File;
-import java.net.Socket;
-import java.io.FileReader;
-import java.io.IOException;
-import java.net.InetSocketAddress;
-import java.net.SocketTimeoutException;
-import java.security.SecureRandom;
-import java.util.List;
-import java.util.Vector;
-
-import ch.ethz.ssh2.auth.AuthenticationManager;
-import ch.ethz.ssh2.channel.ChannelManager;
-import ch.ethz.ssh2.crypto.CryptoWishList;
-import ch.ethz.ssh2.crypto.cipher.BlockCipherFactory;
-import ch.ethz.ssh2.crypto.digest.MAC;
-import ch.ethz.ssh2.packets.PacketIgnore;
-import ch.ethz.ssh2.transport.KexManager;
-import ch.ethz.ssh2.transport.TransportManager;
-import ch.ethz.ssh2.util.TimeoutService;
-import ch.ethz.ssh2.util.TimeoutService.TimeoutToken;
-
-/**
- * A <code>Connection</code> is used to establish an encrypted TCP/IP
- * connection to a SSH-2 server.
- * <p>
- * Typically, one
- * <ol>
- * <li>creates a {@link #Connection(String) Connection} object.</li>
- * <li>calls the {@link #connect() connect()} method.</li>
- * <li>calls some of the authentication methods (e.g., {@link #authenticateWithPublicKey(String, File, String) authenticateWithPublicKey()}).</li>
- * <li>calls one or several times the {@link #openSession() openSession()} method.</li>
- * <li>finally, one must close the connection and release resources with the {@link #close() close()} method.</li>
- * </ol>
- *
- * @author Christian Plattner
- * @version $Id: Connection.java 69 2013-08-09 06:39:56Z dkocher@sudo.ch $
- */
-
-public class Connection
-{
- /**
- * The identifier presented to the SSH-2 server. This is the same
- * as the "softwareversion" defined in RFC 4253.
- * <p/>
- * <b>NOTE: As per the RFC, the "softwareversion" string MUST consist of printable
- * US-ASCII characters, with the exception of whitespace characters and the minus sign (-).</b>
- */
- private String softwareversion = String.format("Ganymed_%s", Version.getSpecification());
-
- /* Will be used to generate all random data needed for the current connection.
- * Note: SecureRandom.nextBytes() is thread safe.
- */
-
- private SecureRandom generator;
-
- private Socket precreatedSocket;
-
- public Connection(Socket socket) {
- this.precreatedSocket = socket;
- this.hostname = socket.getInetAddress().getHostName();
- this.port = socket.getPort();
- }
-
- /**
- * Unless you know what you are doing, you will never need this.
- *
- * @return The list of supported cipher algorithms by this implementation.
- */
- public static synchronized String[] getAvailableCiphers()
- {
- return BlockCipherFactory.getDefaultCipherList();
- }
-
- /**
- * Unless you know what you are doing, you will never need this.
- *
- * @return The list of supported MAC algorthims by this implementation.
- */
- public static synchronized String[] getAvailableMACs()
- {
- return MAC.getMacList();
- }
-
- /**
- * Unless you know what you are doing, you will never need this.
- *
- * @return The list of supported server host key algorthims by this implementation.
- */
- public static synchronized String[] getAvailableServerHostKeyAlgorithms()
- {
- return KexManager.getDefaultServerHostkeyAlgorithmList();
- }
-
- private AuthenticationManager am;
-
- private boolean authenticated = false;
- private ChannelManager cm;
-
- private CryptoWishList cryptoWishList = new CryptoWishList();
-
- private DHGexParameters dhgexpara = new DHGexParameters();
-
- private final String hostname;
-
- private final int port;
-
- private TransportManager tm;
-
- private boolean tcpNoDelay = false;
-
- private ProxyData proxyData = null;
-
- private List<ConnectionMonitor> connectionMonitors = new Vector<ConnectionMonitor>();
-
- /**
- * Prepares a fresh <code>Connection</code> object which can then be used
- * to establish a connection to the specified SSH-2 server.
- * <p>
- * Same as {@link #Connection(String, int) Connection(hostname, 22)}.
- *
- * @param hostname the hostname of the SSH-2 server.
- */
- public Connection(String hostname)
- {
- this(hostname, 22);
- }
-
- /**
- * Prepares a fresh <code>Connection</code> object which can then be used
- * to establish a connection to the specified SSH-2 server.
- *
- * @param hostname
- * the host where we later want to connect to.
- * @param port
- * port on the server, normally 22.
- */
- public Connection(String hostname, int port)
- {
- this.hostname = hostname;
- this.port = port;
- }
-
- /**
- * Prepares a fresh <code>Connection</code> object which can then be used
- * to establish a connection to the specified SSH-2 server.
- *
- * @param hostname
- * the host where we later want to connect to.
- * @param port
- * port on the server, normally 22.
- * @param softwareversion
- * Allows you to set a custom "softwareversion" string as defined in RFC 4253.
- * <b>NOTE: As per the RFC, the "softwareversion" string MUST consist of printable
- * US-ASCII characters, with the exception of whitespace characters and the minus sign (-).</b>
- */
- public Connection(String hostname, int port, String softwareversion)
- {
- this.hostname = hostname;
- this.port = port;
- this.softwareversion = softwareversion;
- }
-
- /**
- * After a successful connect, one has to authenticate oneself. This method
- * is based on DSA (it uses DSA to sign a challenge sent by the server).
- * <p>
- * If the authentication phase is complete, <code>true</code> will be
- * returned. If the server does not accept the request (or if further
- * authentication steps are needed), <code>false</code> is returned and
- * one can retry either by using this or any other authentication method
- * (use the <code>getRemainingAuthMethods</code> method to get a list of
- * the remaining possible methods).
- *
- * @param user
- * A <code>String</code> holding the username.
- * @param pem
- * A <code>String</code> containing the DSA private key of the
- * user in OpenSSH key format (PEM, you can't miss the
- * "-----BEGIN DSA PRIVATE KEY-----" tag). The string may contain
- * linefeeds.
- * @param password
- * If the PEM string is 3DES encrypted ("DES-EDE3-CBC"), then you
- * must specify the password. Otherwise, this argument will be
- * ignored and can be set to <code>null</code>.
- *
- * @return whether the connection is now authenticated.
- * @throws IOException
- *
- * @deprecated You should use one of the {@link #authenticateWithPublicKey(String, File, String) authenticateWithPublicKey()}
- * methods, this method is just a wrapper for it and will
- * disappear in future builds.
- *
- */
- public synchronized boolean authenticateWithDSA(String user, String pem, String password) throws IOException
- {
- if (tm == null)
- throw new IllegalStateException("Connection is not established!");
-
- if (authenticated)
- throw new IllegalStateException("Connection is already authenticated!");
-
- if (am == null)
- am = new AuthenticationManager(tm);
-
- if (cm == null)
- cm = new ChannelManager(tm);
-
- if (user == null)
- throw new IllegalArgumentException("user argument is null");
-
- if (pem == null)
- throw new IllegalArgumentException("pem argument is null");
-
- authenticated = am.authenticatePublicKey(user, pem.toCharArray(), password, getOrCreateSecureRND());
-
- return authenticated;
- }
-
- /**
- * A wrapper that calls {@link #authenticateWithKeyboardInteractive(String, String[], InteractiveCallback)
- * authenticateWithKeyboardInteractivewith} a <code>null</code> submethod list.
- *
- * @param user
- * A <code>String</code> holding the username.
- * @param cb
- * An <code>InteractiveCallback</code> which will be used to
- * determine the responses to the questions asked by the server.
- * @return whether the connection is now authenticated.
- * @throws IOException
- */
- public synchronized boolean authenticateWithKeyboardInteractive(String user, InteractiveCallback cb)
- throws IOException
- {
- return authenticateWithKeyboardInteractive(user, null, cb);
- }
-
- /**
- * After a successful connect, one has to authenticate oneself. This method
- * is based on "keyboard-interactive", specified in
- * draft-ietf-secsh-auth-kbdinteract-XX. Basically, you have to define a
- * callback object which will be feeded with challenges generated by the
- * server. Answers are then sent back to the server. It is possible that the
- * callback will be called several times during the invocation of this
- * method (e.g., if the server replies to the callback's answer(s) with
- * another challenge...)
- * <p>
- * If the authentication phase is complete, <code>true</code> will be
- * returned. If the server does not accept the request (or if further
- * authentication steps are needed), <code>false</code> is returned and
- * one can retry either by using this or any other authentication method
- * (use the <code>getRemainingAuthMethods</code> method to get a list of
- * the remaining possible methods).
- * <p>
- * Note: some SSH servers advertise "keyboard-interactive", however, any
- * interactive request will be denied (without having sent any challenge to
- * the client).
- *
- * @param user
- * A <code>String</code> holding the username.
- * @param submethods
- * An array of submethod names, see
- * draft-ietf-secsh-auth-kbdinteract-XX. May be <code>null</code>
- * to indicate an empty list.
- * @param cb
- * An <code>InteractiveCallback</code> which will be used to
- * determine the responses to the questions asked by the server.
- *
- * @return whether the connection is now authenticated.
- * @throws IOException
- */
- public synchronized boolean authenticateWithKeyboardInteractive(String user, String[] submethods,
- InteractiveCallback cb) throws IOException
- {
- if (cb == null)
- throw new IllegalArgumentException("Callback may not ne NULL!");
-
- if (tm == null)
- throw new IllegalStateException("Connection is not established!");
-
- if (authenticated)
- throw new IllegalStateException("Connection is already authenticated!");
-
- if (am == null)
- am = new AuthenticationManager(tm);
-
- if (cm == null)
- cm = new ChannelManager(tm);
-
- if (user == null)
- throw new IllegalArgumentException("user argument is null");
-
- authenticated = am.authenticateInteractive(user, submethods, cb);
-
- return authenticated;
- }
-
- /**
- * After a successful connect, one has to authenticate oneself. This method
- * sends username and password to the server.
- * <p>
- * If the authentication phase is complete, <code>true</code> will be
- * returned. If the server does not accept the request (or if further
- * authentication steps are needed), <code>false</code> is returned and
- * one can retry either by using this or any other authentication method
- * (use the <code>getRemainingAuthMethods</code> method to get a list of
- * the remaining possible methods).
- * <p>
- * Note: if this method fails, then please double-check that it is actually
- * offered by the server (use {@link #getRemainingAuthMethods(String) getRemainingAuthMethods()}.
- * <p>
- * Often, password authentication is disabled, but users are not aware of it.
- * Many servers only offer "publickey" and "keyboard-interactive". However,
- * even though "keyboard-interactive" *feels* like password authentication
- * (e.g., when using the putty or openssh clients) it is *not* the same mechanism.
- *
- * @param user
- * @param password
- * @return if the connection is now authenticated.
- * @throws IOException
- */
- public synchronized boolean authenticateWithPassword(String user, String password) throws IOException
- {
- if (tm == null)
- throw new IllegalStateException("Connection is not established!");
-
- if (authenticated)
- throw new IllegalStateException("Connection is already authenticated!");
-
- if (am == null)
- am = new AuthenticationManager(tm);
-
- if (cm == null)
- cm = new ChannelManager(tm);
-
- if (user == null)
- throw new IllegalArgumentException("user argument is null");
-
- if (password == null)
- throw new IllegalArgumentException("password argument is null");
-
- authenticated = am.authenticatePassword(user, password);
-
- return authenticated;
- }
-
- /**
- * After a successful connect, one has to authenticate oneself.
- * This method can be used to explicitly use the special "none"
- * authentication method (where only a username has to be specified).
- * <p>
- * Note 1: The "none" method may always be tried by clients, however as by
- * the specs, the server will not explicitly announce it. In other words,
- * the "none" token will never show up in the list returned by
- * {@link #getRemainingAuthMethods(String)}.
- * <p>
- * Note 2: no matter which one of the authenticateWithXXX() methods
- * you call, the library will always issue exactly one initial "none"
- * authentication request to retrieve the initially allowed list of
- * authentication methods by the server. Please read RFC 4252 for the
- * details.
- * <p>
- * If the authentication phase is complete, <code>true</code> will be
- * returned. If further authentication steps are needed, <code>false</code>
- * is returned and one can retry by any other authentication method
- * (use the <code>getRemainingAuthMethods</code> method to get a list of
- * the remaining possible methods).
- *
- * @param user
- * @return if the connection is now authenticated.
- * @throws IOException
- */
- public synchronized boolean authenticateWithNone(String user) throws IOException
- {
- if (tm == null)
- throw new IllegalStateException("Connection is not established!");
-
- if (authenticated)
- throw new IllegalStateException("Connection is already authenticated!");
-
- if (am == null)
- am = new AuthenticationManager(tm);
-
- if (cm == null)
- cm = new ChannelManager(tm);
-
- if (user == null)
- throw new IllegalArgumentException("user argument is null");
-
- /* Trigger the sending of the PacketUserauthRequestNone packet */
- /* (if not already done) */
-
- authenticated = am.authenticateNone(user);
-
- return authenticated;
- }
-
- /**
- * After a successful connect, one has to authenticate oneself.
- * The authentication method "publickey" works by signing a challenge
- * sent by the server. The signature is either DSA or RSA based - it
- * just depends on the type of private key you specify, either a DSA
- * or RSA private key in PEM format. And yes, this is may seem to be a
- * little confusing, the method is called "publickey" in the SSH-2 protocol
- * specification, however since we need to generate a signature, you
- * actually have to supply a private key =).
- * <p>
- * The private key contained in the PEM file may also be encrypted ("Proc-Type: 4,ENCRYPTED").
- * The library supports DES-CBC and DES-EDE3-CBC encryption, as well
- * as the more exotic PEM encrpytions AES-128-CBC, AES-192-CBC and AES-256-CBC.
- * <p>
- * If the authentication phase is complete, <code>true</code> will be
- * returned. If the server does not accept the request (or if further
- * authentication steps are needed), <code>false</code> is returned and
- * one can retry either by using this or any other authentication method
- * (use the <code>getRemainingAuthMethods</code> method to get a list of
- * the remaining possible methods).
- * <p>
- * NOTE PUTTY USERS: Event though your key file may start with "-----BEGIN..."
- * it is not in the expected format. You have to convert it to the OpenSSH
- * key format by using the "puttygen" tool (can be downloaded from the Putty
- * website). Simply load your key and then use the "Conversions/Export OpenSSH key"
- * functionality to get a proper PEM file.
- *
- * @param user
- * A <code>String</code> holding the username.
- * @param pemPrivateKey
- * A <code>char[]</code> containing a DSA or RSA private key of the
- * user in OpenSSH key format (PEM, you can't miss the
- * "-----BEGIN DSA PRIVATE KEY-----" or "-----BEGIN RSA PRIVATE KEY-----"
- * tag). The char array may contain linebreaks/linefeeds.
- * @param password
- * If the PEM structure is encrypted ("Proc-Type: 4,ENCRYPTED") then
- * you must specify a password. Otherwise, this argument will be ignored
- * and can be set to <code>null</code>.
- *
- * @return whether the connection is now authenticated.
- * @throws IOException
- */
- public synchronized boolean authenticateWithPublicKey(String user, char[] pemPrivateKey, String password)
- throws IOException
- {
- if (tm == null)
- throw new IllegalStateException("Connection is not established!");
-
- if (authenticated)
- throw new IllegalStateException("Connection is already authenticated!");
-
- if (am == null)
- am = new AuthenticationManager(tm);
-
- if (cm == null)
- cm = new ChannelManager(tm);
-
- if (user == null)
- throw new IllegalArgumentException("user argument is null");
-
- if (pemPrivateKey == null)
- throw new IllegalArgumentException("pemPrivateKey argument is null");
-
- authenticated = am.authenticatePublicKey(user, pemPrivateKey, password, getOrCreateSecureRND());
-
- return authenticated;
- }
-
- /**
- * A convenience wrapper function which reads in a private key (PEM format, either DSA or RSA)
- * and then calls <code>authenticateWithPublicKey(String, char[], String)</code>.
- * <p>
- * NOTE PUTTY USERS: Event though your key file may start with "-----BEGIN..."
- * it is not in the expected format. You have to convert it to the OpenSSH
- * key format by using the "puttygen" tool (can be downloaded from the Putty
- * website). Simply load your key and then use the "Conversions/Export OpenSSH key"
- * functionality to get a proper PEM file.
- *
- * @param user
- * A <code>String</code> holding the username.
- * @param pemFile
- * A <code>File</code> object pointing to a file containing a DSA or RSA
- * private key of the user in OpenSSH key format (PEM, you can't miss the
- * "-----BEGIN DSA PRIVATE KEY-----" or "-----BEGIN RSA PRIVATE KEY-----"
- * tag).
- * @param password
- * If the PEM file is encrypted then you must specify the password.
- * Otherwise, this argument will be ignored and can be set to <code>null</code>.
- *
- * @return whether the connection is now authenticated.
- * @throws IOException
- */
- public synchronized boolean authenticateWithPublicKey(String user, File pemFile, String password)
- throws IOException
- {
- if (pemFile == null)
- throw new IllegalArgumentException("pemFile argument is null");
-
- char[] buff = new char[256];
-
- CharArrayWriter cw = new CharArrayWriter();
-
- FileReader fr = new FileReader(pemFile);
-
- while (true)
- {
- int len = fr.read(buff);
- if (len < 0)
- break;
- cw.write(buff, 0, len);
- }
-
- fr.close();
-
- return authenticateWithPublicKey(user, cw.toCharArray(), password);
- }
-
- /**
- * Add a {@link ConnectionMonitor} to this connection. Can be invoked at any time,
- * but it is best to add connection monitors before invoking
- * <code>connect()</code> to avoid glitches (e.g., you add a connection monitor after
- * a successful connect(), but the connection has died in the mean time. Then,
- * your connection monitor won't be notified.)
- * <p>
- * You can add as many monitors as you like. If a monitor has already been added, then
- * this method does nothing.
- *
- * @see ConnectionMonitor
- *
- * @param cmon An object implementing the {@link ConnectionMonitor} interface.
- */
- public synchronized void addConnectionMonitor(ConnectionMonitor cmon)
- {
- if (cmon == null)
- throw new IllegalArgumentException("cmon argument is null");
-
- if (!connectionMonitors.contains(cmon))
- {
- connectionMonitors.add(cmon);
-
- if (tm != null)
- tm.setConnectionMonitors(connectionMonitors);
- }
- }
-
- /**
- * Remove a {@link ConnectionMonitor} from this connection.
- *
- * @param cmon
- * @return whether the monitor could be removed
- */
- public synchronized boolean removeConnectionMonitor(ConnectionMonitor cmon)
- {
- if (cmon == null)
- throw new IllegalArgumentException("cmon argument is null");
-
- boolean existed = connectionMonitors.remove(cmon);
-
- if (tm != null)
- tm.setConnectionMonitors(connectionMonitors);
-
- return existed;
- }
-
- /**
- * Close the connection to the SSH-2 server. All assigned sessions will be
- * closed, too. Can be called at any time. Don't forget to call this once
- * you don't need a connection anymore - otherwise the receiver thread may
- * run forever.
- */
- public synchronized void close()
- {
- Throwable t = new Throwable("Closed due to user request.");
- close(t, false);
- }
-
- public synchronized void close(Throwable t, boolean hard)
- {
- if (cm != null)
- cm.closeAllChannels();
-
- if (tm != null)
- {
- tm.close(t, hard == false);
- tm = null;
- }
- am = null;
- cm = null;
- authenticated = false;
- }
-
- /**
- * Same as {@link #connect(ServerHostKeyVerifier, int, int) connect(null, 0, 0)}.
- *
- * @return see comments for the {@link #connect(ServerHostKeyVerifier, int, int) connect(ServerHostKeyVerifier, int, int)} method.
- * @throws IOException
- */
- public synchronized ConnectionInfo connect() throws IOException
- {
- return connect(null, 0, 0);
- }
-
- /**
- * Same as {@link #connect(ServerHostKeyVerifier, int, int) connect(verifier, 0, 0)}.
- *
- * @return see comments for the {@link #connect(ServerHostKeyVerifier, int, int) connect(ServerHostKeyVerifier, int, int)} method.
- * @throws IOException
- */
- public synchronized ConnectionInfo connect(ServerHostKeyVerifier verifier) throws IOException
- {
- return connect(verifier, 0, 0);
- }
-
- /**
- * Connect to the SSH-2 server and, as soon as the server has presented its
- * host key, use the {@link ServerHostKeyVerifier#verifyServerHostKey(String,
- * int, String, byte[]) ServerHostKeyVerifier.verifyServerHostKey()}
- * method of the <code>verifier</code> to ask for permission to proceed.
- * If <code>verifier</code> is <code>null</code>, then any host key will be
- * accepted - this is NOT recommended, since it makes man-in-the-middle attackes
- * VERY easy (somebody could put a proxy SSH server between you and the real server).
- * <p>
- * Note: The verifier will be called before doing any crypto calculations
- * (i.e., diffie-hellman). Therefore, if you don't like the presented host key then
- * no CPU cycles are wasted (and the evil server has less information about us).
- * <p>
- * However, it is still possible that the server presented a fake host key: the server
- * cheated (typically a sign for a man-in-the-middle attack) and is not able to generate
- * a signature that matches its host key. Don't worry, the library will detect such
- * a scenario later when checking the signature (the signature cannot be checked before
- * having completed the diffie-hellman exchange).
- * <p>
- * Note 2: The {@link ServerHostKeyVerifier#verifyServerHostKey(String,
- * int, String, byte[]) ServerHostKeyVerifier.verifyServerHostKey()} method
- * will *NOT* be called from the current thread, the call is being made from a
- * background thread (there is a background dispatcher thread for every
- * established connection).
- * <p>
- * Note 3: This method will block as long as the key exchange of the underlying connection
- * has not been completed (and you have not specified any timeouts).
- * <p>
- * Note 4: If you want to re-use a connection object that was successfully connected,
- * then you must call the {@link #close()} method before invoking <code>connect()</code> again.
- *
- * @param verifier
- * An object that implements the
- * {@link ServerHostKeyVerifier} interface. Pass <code>null</code>
- * to accept any server host key - NOT recommended.
- *
- * @param connectTimeout
- * Connect the underlying TCP socket to the server with the given timeout
- * value (non-negative, in milliseconds). Zero means no timeout. If a proxy is being
- * used (see {@link #setProxyData(ProxyData)}), then this timeout is used for the
- * connection establishment to the proxy.
- *
- * @param kexTimeout
- * Timeout for complete connection establishment (non-negative,
- * in milliseconds). Zero means no timeout. The timeout counts from the
- * moment you invoke the connect() method and is cancelled as soon as the
- * first key-exchange round has finished. It is possible that
- * the timeout event will be fired during the invocation of the
- * <code>verifier</code> callback, but it will only have an effect after
- * the <code>verifier</code> returns.
- *
- * @return A {@link ConnectionInfo} object containing the details of
- * the established connection.
- *
- * @throws IOException
- * If any problem occurs, e.g., the server's host key is not
- * accepted by the <code>verifier</code> or there is problem during
- * the initial crypto setup (e.g., the signature sent by the server is wrong).
- * <p>
- * In case of a timeout (either connectTimeout or kexTimeout)
- * a SocketTimeoutException is thrown.
- * <p>
- * An exception may also be thrown if the connection was already successfully
- * connected (no matter if the connection broke in the mean time) and you invoke
- * <code>connect()</code> again without having called {@link #close()} first.
- * <p>
- * If a HTTP proxy is being used and the proxy refuses the connection,
- * then a {@link HTTPProxyException} may be thrown, which
- * contains the details returned by the proxy. If the proxy is buggy and does
- * not return a proper HTTP response, then a normal IOException is thrown instead.
- */
- public synchronized ConnectionInfo connect(ServerHostKeyVerifier verifier, int connectTimeout, int kexTimeout)
- throws IOException
- {
- final class TimeoutState
- {
- boolean isCancelled = false;
- boolean timeoutSocketClosed = false;
- }
-
- if (tm != null)
- throw new IOException("Connection to " + hostname + " is already in connected state!");
-
- if (connectTimeout < 0)
- throw new IllegalArgumentException("connectTimeout must be non-negative!");
-
- if (kexTimeout < 0)
- throw new IllegalArgumentException("kexTimeout must be non-negative!");
-
- final TimeoutState state = new TimeoutState();
-
- tm = new TransportManager();
- tm.setSoTimeout(connectTimeout);
- tm.setConnectionMonitors(connectionMonitors);
-
- /* Make sure that the runnable below will observe the new value of "tm"
- * and "state" (the runnable will be executed in a different thread, which
- * may be already running, that is why we need a memory barrier here).
- * See also the comment in Channel.java if you
- * are interested in the details.
- *
- * OKOK, this is paranoid since adding the runnable to the todo list
- * of the TimeoutService will ensure that all writes have been flushed
- * before the Runnable reads anything
- * (there is a synchronized block in TimeoutService.addTimeoutHandler).
- */
-
- synchronized (tm)
- {
- /* We could actually synchronize on anything. */
- }
-
- try
- {
- TimeoutToken token = null;
-
- if (kexTimeout > 0)
- {
- final Runnable timeoutHandler = new Runnable()
- {
- public void run()
- {
- synchronized (state)
- {
- if (state.isCancelled)
- return;
- state.timeoutSocketClosed = true;
- tm.close(new SocketTimeoutException("The connect timeout expired"), false);
- }
- }
- };
-
- long timeoutHorizont = System.currentTimeMillis() + kexTimeout;
-
- token = TimeoutService.addTimeoutHandler(timeoutHorizont, timeoutHandler);
- }
-
- try
- {
-
- if (precreatedSocket != null) {
- tm.clientInit(precreatedSocket, softwareversion, cryptoWishList, verifier, dhgexpara,
- getOrCreateSecureRND());
- } else {
- tm.clientInit(hostname, port, softwareversion, cryptoWishList, verifier, dhgexpara, connectTimeout,
- getOrCreateSecureRND(), proxyData);
- }
- }
- catch (SocketTimeoutException se)
- {
- throw (SocketTimeoutException) new SocketTimeoutException(
- "The connect() operation on the socket timed out.").initCause(se);
- }
-
- tm.setTcpNoDelay(tcpNoDelay);
-
- /* Wait until first KEX has finished */
-
- ConnectionInfo ci = tm.getConnectionInfo(1);
-
- /* Now try to cancel the timeout, if needed */
-
- if (token != null)
- {
- TimeoutService.cancelTimeoutHandler(token);
-
- /* Were we too late? */
-
- synchronized (state)
- {
- if (state.timeoutSocketClosed)
- throw new IOException("This exception will be replaced by the one below =)");
- /* Just in case the "cancelTimeoutHandler" invocation came just a little bit
- * too late but the handler did not enter the semaphore yet - we can
- * still stop it.
- */
- state.isCancelled = true;
- }
- }
-
- return ci;
- }
- catch (SocketTimeoutException ste)
- {
- throw ste;
- }
- catch (IOException e1)
- {
- /* This will also invoke any registered connection monitors */
- close(new Throwable("There was a problem during connect."), false);
-
- synchronized (state)
- {
- /* Show a clean exception, not something like "the socket is closed!?!" */
- if (state.timeoutSocketClosed)
- throw new SocketTimeoutException("The kexTimeout (" + kexTimeout + " ms) expired.");
- }
-
- /* Do not wrap a HTTPProxyException */
- if (e1 instanceof HTTPProxyException)
- throw e1;
-
- throw (IOException) new IOException("There was a problem while connecting to " + hostname + ":" + port)
- .initCause(e1);
- }
- }
-
- /**
- * Creates a new {@link LocalPortForwarder}.
- * A <code>LocalPortForwarder</code> forwards TCP/IP connections that arrive at a local
- * port via the secure tunnel to another host (which may or may not be
- * identical to the remote SSH-2 server).
- * <p>
- * This method must only be called after one has passed successfully the authentication step.
- * There is no limit on the number of concurrent forwardings.
- *
- * @param local_port the local port the LocalPortForwarder shall bind to.
- * @param host_to_connect target address (IP or hostname)
- * @param port_to_connect target port
- * @return A {@link LocalPortForwarder} object.
- * @throws IOException
- */
- public synchronized LocalPortForwarder createLocalPortForwarder(int local_port, String host_to_connect,
- int port_to_connect) throws IOException
- {
- if (tm == null)
- throw new IllegalStateException("Cannot forward ports, you need to establish a connection first.");
-
- if (!authenticated)
- throw new IllegalStateException("Cannot forward ports, connection is not authenticated.");
-
- return new LocalPortForwarder(cm, local_port, host_to_connect, port_to_connect);
- }
-
- /**
- * Creates a new {@link LocalPortForwarder}.
- * A <code>LocalPortForwarder</code> forwards TCP/IP connections that arrive at a local
- * port via the secure tunnel to another host (which may or may not be
- * identical to the remote SSH-2 server).
- * <p>
- * This method must only be called after one has passed successfully the authentication step.
- * There is no limit on the number of concurrent forwardings.
- *
- * @param addr specifies the InetSocketAddress where the local socket shall be bound to.
- * @param host_to_connect target address (IP or hostname)
- * @param port_to_connect target port
- * @return A {@link LocalPortForwarder} object.
- * @throws IOException
- */
- public synchronized LocalPortForwarder createLocalPortForwarder(InetSocketAddress addr, String host_to_connect,
- int port_to_connect) throws IOException
- {
- if (tm == null)
- throw new IllegalStateException("Cannot forward ports, you need to establish a connection first.");
-
- if (!authenticated)
- throw new IllegalStateException("Cannot forward ports, connection is not authenticated.");
-
- return new LocalPortForwarder(cm, addr, host_to_connect, port_to_connect);
- }
-
- /**
- * Creates a new {@link LocalStreamForwarder}.
- * A <code>LocalStreamForwarder</code> manages an Input/Outputstream pair
- * that is being forwarded via the secure tunnel into a TCP/IP connection to another host
- * (which may or may not be identical to the remote SSH-2 server).
- *
- * @param host_to_connect
- * @param port_to_connect
- * @return A {@link LocalStreamForwarder} object.
- * @throws IOException
- */
- public synchronized LocalStreamForwarder createLocalStreamForwarder(String host_to_connect, int port_to_connect)
- throws IOException
- {
- if (tm == null)
- throw new IllegalStateException("Cannot forward, you need to establish a connection first.");
-
- if (!authenticated)
- throw new IllegalStateException("Cannot forward, connection is not authenticated.");
-
- return new LocalStreamForwarder(cm, host_to_connect, port_to_connect);
- }
-
- /**
- * Create a very basic {@link SCPClient} that can be used to copy
- * files from/to the SSH-2 server.
- * <p>
- * Works only after one has passed successfully the authentication step.
- * There is no limit on the number of concurrent SCP clients.
- * <p>
- * Note: This factory method will probably disappear in the future.
- *
- * @return A {@link SCPClient} object.
- * @throws IOException
- */
- public synchronized SCPClient createSCPClient() throws IOException
- {
- if (tm == null)
- throw new IllegalStateException("Cannot create SCP client, you need to establish a connection first.");
-
- if (!authenticated)
- throw new IllegalStateException("Cannot create SCP client, connection is not authenticated.");
-
- return new SCPClient(this);
- }
-
- /**
- * Force an asynchronous key re-exchange (the call does not block). The
- * latest values set for MAC, Cipher and DH group exchange parameters will
- * be used. If a key exchange is currently in progress, then this method has
- * the only effect that the so far specified parameters will be used for the
- * next (server driven) key exchange.
- * <p>
- * Note: This implementation will never start a key exchange (other than the initial one)
- * unless you or the SSH-2 server ask for it.
- *
- * @throws IOException
- * In case of any failure behind the scenes.
- */
- public synchronized void forceKeyExchange() throws IOException
- {
- if (tm == null)
- throw new IllegalStateException("You need to establish a connection first.");
-
- tm.forceKeyExchange(cryptoWishList, dhgexpara, null, null);
- }
-
- /**
- * Returns the hostname that was passed to the constructor.
- *
- * @return the hostname
- */
- public synchronized String getHostname()
- {
- return hostname;
- }
-
- /**
- * Returns the port that was passed to the constructor.
- *
- * @return the TCP port
- */
- public synchronized int getPort()
- {
- return port;
- }
-
- /**
- * Returns a {@link ConnectionInfo} object containing the details of
- * the connection. Can be called as soon as the connection has been
- * established (successfully connected).
- *
- * @return A {@link ConnectionInfo} object.
- * @throws IOException
- * In case of any failure behind the scenes.
- */
- public synchronized ConnectionInfo getConnectionInfo() throws IOException
- {
- if (tm == null)
- throw new IllegalStateException(
- "Cannot get details of connection, you need to establish a connection first.");
- return tm.getConnectionInfo(1);
- }
-
- /**
- * After a successful connect, one has to authenticate oneself. This method
- * can be used to tell which authentication methods are supported by the
- * server at a certain stage of the authentication process (for the given
- * username).
- * <p>
- * Note 1: the username will only be used if no authentication step was done
- * so far (it will be used to ask the server for a list of possible
- * authentication methods by sending the initial "none" request). Otherwise,
- * this method ignores the user name and returns a cached method list
- * (which is based on the information contained in the last negative server response).
- * <p>
- * Note 2: the server may return method names that are not supported by this
- * implementation.
- * <p>
- * After a successful authentication, this method must not be called
- * anymore.
- *
- * @param user
- * A <code>String</code> holding the username.
- *
- * @return a (possibly emtpy) array holding authentication method names.
- * @throws IOException
- */
- public synchronized String[] getRemainingAuthMethods(String user) throws IOException
- {
- if (user == null)
- throw new IllegalArgumentException("user argument may not be NULL!");
-
- if (tm == null)
- throw new IllegalStateException("Connection is not established!");
-
- if (authenticated)
- throw new IllegalStateException("Connection is already authenticated!");
-
- if (am == null)
- am = new AuthenticationManager(tm);
-
- if (cm == null)
- cm = new ChannelManager(tm);
-
- return am.getRemainingMethods(user);
- }
-
- /**
- * Determines if the authentication phase is complete. Can be called at any
- * time.
- *
- * @return <code>true</code> if no further authentication steps are
- * needed.
- */
- public synchronized boolean isAuthenticationComplete()
- {
- return authenticated;
- }
-
- /**
- * Returns true if there was at least one failed authentication request and
- * the last failed authentication request was marked with "partial success"
- * by the server. This is only needed in the rare case of SSH-2 server setups
- * that cannot be satisfied with a single successful authentication request
- * (i.e., multiple authentication steps are needed.)
- * <p>
- * If you are interested in the details, then have a look at RFC4252.
- *
- * @return if the there was a failed authentication step and the last one
- * was marked as a "partial success".
- */
- public synchronized boolean isAuthenticationPartialSuccess()
- {
- if (am == null)
- return false;
-
- return am.getPartialSuccess();
- }
-
- /**
- * Checks if a specified authentication method is available. This method is
- * actually just a wrapper for {@link #getRemainingAuthMethods(String)
- * getRemainingAuthMethods()}.
- *
- * @param user
- * A <code>String</code> holding the username.
- * @param method
- * An authentication method name (e.g., "publickey", "password",
- * "keyboard-interactive") as specified by the SSH-2 standard.
- * @return if the specified authentication method is currently available.
- * @throws IOException
- */
- public synchronized boolean isAuthMethodAvailable(String user, String method) throws IOException
- {
- if (method == null)
- throw new IllegalArgumentException("method argument may not be NULL!");
-
- String methods[] = getRemainingAuthMethods(user);
-
- for (int i = 0; i < methods.length; i++)
- {
- if (methods[i].compareTo(method) == 0)
- return true;
- }
-
- return false;
- }
-
- private SecureRandom getOrCreateSecureRND()
- {
- if (generator == null)
- generator = new SecureRandom();
-
- return generator;
- }
-
- /**
- * Open a new {@link Session} on this connection. Works only after one has passed
- * successfully the authentication step. There is no limit on the number of
- * concurrent sessions.
- *
- * @return A {@link Session} object.
- * @throws IOException
- */
- public synchronized Session openSession() throws IOException
- {
- if (tm == null)
- throw new IllegalStateException("Cannot open session, you need to establish a connection first.");
-
- if (!authenticated)
- throw new IllegalStateException("Cannot open session, connection is not authenticated.");
-
- return new Session(cm, getOrCreateSecureRND());
- }
-
- /**
- * Send an SSH_MSG_IGNORE packet. This method will generate a random data attribute
- * (length between 0 (invlusive) and 16 (exclusive) bytes, contents are random bytes).
- * <p>
- * This method must only be called once the connection is established.
- *
- * @throws IOException
- */
- public synchronized void sendIgnorePacket() throws IOException
- {
- SecureRandom rnd = getOrCreateSecureRND();
-
- byte[] data = new byte[rnd.nextInt(16)];
- rnd.nextBytes(data);
-
- sendIgnorePacket(data);
- }
-
- /**
- * Send an SSH_MSG_IGNORE packet with the given data attribute.
- * <p>
- * This method must only be called once the connection is established.
- *
- * @throws IOException
- */
- public synchronized void sendIgnorePacket(byte[] data) throws IOException
- {
- if (data == null)
- throw new IllegalArgumentException("data argument must not be null.");
-
- if (tm == null)
- throw new IllegalStateException(
- "Cannot send SSH_MSG_IGNORE packet, you need to establish a connection first.");
-
- PacketIgnore pi = new PacketIgnore();
- pi.setData(data);
-
- tm.sendMessage(pi.getPayload());
- }
-
- /**
- * Removes duplicates from a String array, keeps only first occurence
- * of each element. Does not destroy order of elements; can handle nulls.
- * Uses a very efficient O(N^2) algorithm =)
- *
- * @param list a String array.
- * @return a cleaned String array.
- */
- private String[] removeDuplicates(String[] list)
- {
- if ((list == null) || (list.length < 2))
- return list;
-
- String[] list2 = new String[list.length];
-
- int count = 0;
-
- for (int i = 0; i < list.length; i++)
- {
- boolean duplicate = false;
-
- String element = list[i];
-
- for (int j = 0; j < count; j++)
- {
- if (((element == null) && (list2[j] == null)) || ((element != null) && (element.equals(list2[j]))))
- {
- duplicate = true;
- break;
- }
- }
-
- if (duplicate)
- continue;
-
- list2[count++] = list[i];
- }
-
- if (count == list2.length)
- return list2;
-
- String[] tmp = new String[count];
- System.arraycopy(list2, 0, tmp, 0, count);
-
- return tmp;
- }
-
- /**
- * Unless you know what you are doing, you will never need this.
- *
- * @param ciphers
- */
- public synchronized void setClient2ServerCiphers(String[] ciphers)
- {
- if ((ciphers == null) || (ciphers.length == 0))
- throw new IllegalArgumentException();
- ciphers = removeDuplicates(ciphers);
- BlockCipherFactory.checkCipherList(ciphers);
- cryptoWishList.c2s_enc_algos = ciphers;
- }
-
- /**
- * Unless you know what you are doing, you will never need this.
- *
- * @param macs
- */
- public synchronized void setClient2ServerMACs(String[] macs)
- {
- if ((macs == null) || (macs.length == 0))
- throw new IllegalArgumentException();
- macs = removeDuplicates(macs);
- MAC.checkMacList(macs);
- cryptoWishList.c2s_mac_algos = macs;
- }
-
- /**
- * Sets the parameters for the diffie-hellman group exchange. Unless you
- * know what you are doing, you will never need this. Default values are
- * defined in the {@link DHGexParameters} class.
- *
- * @param dgp {@link DHGexParameters}, non null.
- *
- */
- public synchronized void setDHGexParameters(DHGexParameters dgp)
- {
- if (dgp == null)
- throw new IllegalArgumentException();
-
- dhgexpara = dgp;
- }
-
- /**
- * Unless you know what you are doing, you will never need this.
- *
- * @param ciphers
- */
- public synchronized void setServer2ClientCiphers(String[] ciphers)
- {
- if ((ciphers == null) || (ciphers.length == 0))
- throw new IllegalArgumentException();
- ciphers = removeDuplicates(ciphers);
- BlockCipherFactory.checkCipherList(ciphers);
- cryptoWishList.s2c_enc_algos = ciphers;
- }
-
- /**
- * Unless you know what you are doing, you will never need this.
- *
- * @param macs
- */
- public synchronized void setServer2ClientMACs(String[] macs)
- {
- if ((macs == null) || (macs.length == 0))
- throw new IllegalArgumentException();
-
- macs = removeDuplicates(macs);
- MAC.checkMacList(macs);
- cryptoWishList.s2c_mac_algos = macs;
- }
-
- /**
- * Define the set of allowed server host key algorithms to be used for
- * the following key exchange operations.
- * <p>
- * Unless you know what you are doing, you will never need this.
- *
- * @param algos An array of allowed server host key algorithms.
- * SSH-2 defines <code>ssh-dss</code> and <code>ssh-rsa</code>.
- * The entries of the array must be ordered after preference, i.e.,
- * the entry at index 0 is the most preferred one. You must specify
- * at least one entry.
- */
- public synchronized void setServerHostKeyAlgorithms(String[] algos)
- {
- if ((algos == null) || (algos.length == 0))
- throw new IllegalArgumentException();
-
- algos = removeDuplicates(algos);
- KexManager.checkServerHostkeyAlgorithmsList(algos);
- cryptoWishList.serverHostKeyAlgorithms = algos;
- }
-
- /**
- * Enable/disable TCP_NODELAY (disable/enable Nagle's algorithm) on the underlying socket.
- * <p>
- * Can be called at any time. If the connection has not yet been established
- * then the passed value will be stored and set after the socket has been set up.
- * The default value that will be used is <code>false</code>.
- *
- * @param enable the argument passed to the <code>Socket.setTCPNoDelay()</code> method.
- * @throws IOException
- */
- public synchronized void setTCPNoDelay(boolean enable) throws IOException
- {
- tcpNoDelay = enable;
-
- if (tm != null)
- tm.setTcpNoDelay(enable);
- }
-
- /**
- * Used to tell the library that the connection shall be established through a proxy server.
- * It only makes sense to call this method before calling the {@link #connect() connect()}
- * method.
- * <p>
- * At the moment, only HTTP proxies are supported.
- * <p>
- * Note: This method can be called any number of times. The {@link #connect() connect()}
- * method will use the value set in the last preceding invocation of this method.
- *
- * @see HTTPProxyData
- *
- * @param proxyData Connection information about the proxy. If <code>null</code>, then
- * no proxy will be used (non surprisingly, this is also the default).
- */
- public synchronized void setProxyData(ProxyData proxyData)
- {
- this.proxyData = proxyData;
- }
-
- /**
- * Request a remote port forwarding.
- * If successful, then forwarded connections will be redirected to the given target address.
- * You can cancle a requested remote port forwarding by calling
- * {@link #cancelRemotePortForwarding(int) cancelRemotePortForwarding()}.
- * <p>
- * A call of this method will block until the peer either agreed or disagreed to your request-
- * <p>
- * Note 1: this method typically fails if you
- * <ul>
- * <li>pass a port number for which the used remote user has not enough permissions (i.e., port
- * < 1024)</li>
- * <li>or pass a port number that is already in use on the remote server</li>
- * <li>or if remote port forwarding is disabled on the server.</li>
- * </ul>
- * <p>
- * Note 2: (from the openssh man page): By default, the listening socket on the server will be
- * bound to the loopback interface only. This may be overriden by specifying a bind address.
- * Specifying a remote bind address will only succeed if the server's <b>GatewayPorts</b> option
- * is enabled (see sshd_config(5)).
- *
- * @param bindAddress address to bind to on the server:
- * <ul>
- * <li>"" means that connections are to be accepted on all protocol families
- * supported by the SSH implementation</li>
- * <li>"0.0.0.0" means to listen on all IPv4 addresses</li>
- * <li>"::" means to listen on all IPv6 addresses</li>
- * <li>"localhost" means to listen on all protocol families supported by the SSH
- * implementation on loopback addresses only, [RFC3330] and RFC3513]</li>
- * <li>"127.0.0.1" and "::1" indicate listening on the loopback interfaces for
- * IPv4 and IPv6 respectively</li>
- * </ul>
- * @param bindPort port number to bind on the server (must be > 0)
- * @param targetAddress the target address (IP or hostname)
- * @param targetPort the target port
- * @throws IOException
- */
- public synchronized void requestRemotePortForwarding(String bindAddress, int bindPort, String targetAddress,
- int targetPort) throws IOException
- {
- if (tm == null)
- throw new IllegalStateException("You need to establish a connection first.");
-
- if (!authenticated)
- throw new IllegalStateException("The connection is not authenticated.");
-
- if ((bindAddress == null) || (targetAddress == null) || (bindPort <= 0) || (targetPort <= 0))
- throw new IllegalArgumentException();
-
- cm.requestGlobalForward(bindAddress, bindPort, targetAddress, targetPort);
- }
-
- /**
- * Cancel an earlier requested remote port forwarding.
- * Currently active forwardings will not be affected (e.g., disrupted).
- * Note that further connection forwarding requests may be received until
- * this method has returned.
- *
- * @param bindPort the allocated port number on the server
- * @throws IOException if the remote side refuses the cancel request or another low
- * level error occurs (e.g., the underlying connection is closed)
- */
- public synchronized void cancelRemotePortForwarding(int bindPort) throws IOException
- {
- if (tm == null)
- throw new IllegalStateException("You need to establish a connection first.");
-
- if (!authenticated)
- throw new IllegalStateException("The connection is not authenticated.");
-
- cm.requestCancelGlobalForward(bindPort);
- }
-
- /**
- * Provide your own instance of SecureRandom. Can be used, e.g., if you
- * want to seed the used SecureRandom generator manually.
- * <p>
- * The SecureRandom instance is used during key exchanges, public key authentication,
- * x11 cookie generation and the like.
- *
- * @param rnd a SecureRandom instance
- */
- public synchronized void setSecureRandom(SecureRandom rnd)
- {
- if (rnd == null)
- throw new IllegalArgumentException();
-
- this.generator = rnd;
- }
-}
Code Review / controller.git / commitdiff