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- /*
- * Copyright (C) 2009, Constantine Plotnikov <constantine.plotnikov@gmail.com>
- * Copyright (C) 2008-2009, Google Inc.
- * Copyright (C) 2009, Google, Inc.
- * Copyright (C) 2009, JetBrains s.r.o.
- * Copyright (C) 2008, Robin Rosenberg <robin.rosenberg@dewire.com>
- * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.transport;
-
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.FileNotFoundException;
- import java.io.IOException;
- import java.net.ConnectException;
- import java.net.UnknownHostException;
- import java.util.HashMap;
- import java.util.Map;
-
- import org.eclipse.jgit.errors.TransportException;
- import org.eclipse.jgit.internal.JGitText;
- import org.eclipse.jgit.util.FS;
-
- import com.jcraft.jsch.JSch;
- import com.jcraft.jsch.JSchException;
- import com.jcraft.jsch.Session;
- import com.jcraft.jsch.UserInfo;
-
- /**
- * The base session factory that loads known hosts and private keys from
- * <code>$HOME/.ssh</code>.
- * <p>
- * This is the default implementation used by JGit and provides most of the
- * compatibility necessary to match OpenSSH, a popular implementation of SSH
- * used by C Git.
- * <p>
- * The factory does not provide UI behavior. Override the method
- * {@link #configure(org.eclipse.jgit.transport.OpenSshConfig.Host, Session)}
- * to supply appropriate {@link UserInfo} to the session.
- */
- public abstract class JschConfigSessionFactory extends SshSessionFactory {
- private final Map<String, JSch> byIdentityFile = new HashMap<String, JSch>();
-
- private JSch defaultJSch;
-
- private OpenSshConfig config;
-
- @Override
- public synchronized RemoteSession getSession(URIish uri,
- CredentialsProvider credentialsProvider, FS fs, int tms)
- throws TransportException {
-
- String user = uri.getUser();
- final String pass = uri.getPass();
- String host = uri.getHost();
- int port = uri.getPort();
-
- try {
- if (config == null)
- config = OpenSshConfig.get(fs);
-
- final OpenSshConfig.Host hc = config.lookup(host);
- host = hc.getHostName();
- if (port <= 0)
- port = hc.getPort();
- if (user == null)
- user = hc.getUser();
-
- Session session = createSession(credentialsProvider, fs, user,
- pass, host, port, hc);
-
- int retries = 0;
- while (!session.isConnected()) {
- try {
- retries++;
- session.connect(tms);
- } catch (JSchException e) {
- session.disconnect();
- session = null;
- // Make sure our known_hosts is not outdated
- knownHosts(getJSch(hc, fs), fs);
-
- if (isAuthenticationCanceled(e)) {
- throw e;
- } else if (isAuthenticationFailed(e)
- && credentialsProvider != null) {
- // if authentication failed maybe credentials changed at
- // the remote end therefore reset credentials and retry
- if (retries < 3) {
- credentialsProvider.reset(uri);
- session = createSession(credentialsProvider, fs,
- user, pass, host, port, hc);
- } else
- throw e;
- } else if (retries >= hc.getConnectionAttempts()) {
- throw e;
- } else {
- try {
- Thread.sleep(1000);
- session = createSession(credentialsProvider, fs,
- user, pass, host, port, hc);
- } catch (InterruptedException e1) {
- throw new TransportException(
- JGitText.get().transportSSHRetryInterrupt,
- e1);
- }
- }
- }
- }
-
- return new JschSession(session, uri);
-
- } catch (JSchException je) {
- final Throwable c = je.getCause();
- if (c instanceof UnknownHostException)
- throw new TransportException(uri, JGitText.get().unknownHost);
- if (c instanceof ConnectException)
- throw new TransportException(uri, c.getMessage());
- throw new TransportException(uri, je.getMessage(), je);
- }
-
- }
-
- private static boolean isAuthenticationFailed(JSchException e) {
- return e.getCause() == null && e.getMessage().equals("Auth fail"); //$NON-NLS-1$
- }
-
- private static boolean isAuthenticationCanceled(JSchException e) {
- return e.getCause() == null && e.getMessage().equals("Auth cancel"); //$NON-NLS-1$
- }
-
- private Session createSession(CredentialsProvider credentialsProvider,
- FS fs, String user, final String pass, String host, int port,
- final OpenSshConfig.Host hc) throws JSchException {
- final Session session = createSession(hc, user, host, port, fs);
- // We retry already in getSession() method. JSch must not retry
- // on its own.
- session.setConfig("MaxAuthTries", "1"); //$NON-NLS-1$ //$NON-NLS-2$
- if (pass != null)
- session.setPassword(pass);
- final String strictHostKeyCheckingPolicy = hc
- .getStrictHostKeyChecking();
- if (strictHostKeyCheckingPolicy != null)
- session.setConfig("StrictHostKeyChecking", //$NON-NLS-1$
- strictHostKeyCheckingPolicy);
- final String pauth = hc.getPreferredAuthentications();
- if (pauth != null)
- session.setConfig("PreferredAuthentications", pauth); //$NON-NLS-1$
- if (credentialsProvider != null
- && (!hc.isBatchMode() || !credentialsProvider.isInteractive())) {
- session.setUserInfo(new CredentialsProviderUserInfo(session,
- credentialsProvider));
- }
- configure(hc, session);
- return session;
- }
-
- /**
- * Create a new remote session for the requested address.
- *
- * @param hc
- * host configuration
- * @param user
- * login to authenticate as.
- * @param host
- * server name to connect to.
- * @param port
- * port number of the SSH daemon (typically 22).
- * @param fs
- * the file system abstraction which will be necessary to
- * perform certain file system operations.
- * @return new session instance, but otherwise unconfigured.
- * @throws JSchException
- * the session could not be created.
- */
- protected Session createSession(final OpenSshConfig.Host hc,
- final String user, final String host, final int port, FS fs)
- throws JSchException {
- return getJSch(hc, fs).getSession(user, host, port);
- }
-
- /**
- * Provide additional configuration for the session based on the host
- * information. This method could be used to supply {@link UserInfo}.
- *
- * @param hc
- * host configuration
- * @param session
- * session to configure
- */
- protected abstract void configure(OpenSshConfig.Host hc, Session session);
-
- /**
- * Obtain the JSch used to create new sessions.
- *
- * @param hc
- * host configuration
- * @param fs
- * the file system abstraction which will be necessary to
- * perform certain file system operations.
- * @return the JSch instance to use.
- * @throws JSchException
- * the user configuration could not be created.
- */
- protected JSch getJSch(final OpenSshConfig.Host hc, FS fs) throws JSchException {
- if (defaultJSch == null) {
- defaultJSch = createDefaultJSch(fs);
- for (Object name : defaultJSch.getIdentityNames())
- byIdentityFile.put((String) name, defaultJSch);
- }
-
- final File identityFile = hc.getIdentityFile();
- if (identityFile == null)
- return defaultJSch;
-
- final String identityKey = identityFile.getAbsolutePath();
- JSch jsch = byIdentityFile.get(identityKey);
- if (jsch == null) {
- jsch = new JSch();
- jsch.setHostKeyRepository(defaultJSch.getHostKeyRepository());
- jsch.addIdentity(identityKey);
- byIdentityFile.put(identityKey, jsch);
- }
- return jsch;
- }
-
- /**
- * @param fs
- * the file system abstraction which will be necessary to
- * perform certain file system operations.
- * @return the new default JSch implementation.
- * @throws JSchException
- * known host keys cannot be loaded.
- */
- protected JSch createDefaultJSch(FS fs) throws JSchException {
- final JSch jsch = new JSch();
- knownHosts(jsch, fs);
- identities(jsch, fs);
- return jsch;
- }
-
- private static void knownHosts(final JSch sch, FS fs) throws JSchException {
- final File home = fs.userHome();
- if (home == null)
- return;
- final File known_hosts = new File(new File(home, ".ssh"), "known_hosts"); //$NON-NLS-1$ //$NON-NLS-2$
- try {
- final FileInputStream in = new FileInputStream(known_hosts);
- try {
- sch.setKnownHosts(in);
- } finally {
- in.close();
- }
- } catch (FileNotFoundException none) {
- // Oh well. They don't have a known hosts in home.
- } catch (IOException err) {
- // Oh well. They don't have a known hosts in home.
- }
- }
-
- private static void identities(final JSch sch, FS fs) {
- final File home = fs.userHome();
- if (home == null)
- return;
- final File sshdir = new File(home, ".ssh"); //$NON-NLS-1$
- if (sshdir.isDirectory()) {
- loadIdentity(sch, new File(sshdir, "identity")); //$NON-NLS-1$
- loadIdentity(sch, new File(sshdir, "id_rsa")); //$NON-NLS-1$
- loadIdentity(sch, new File(sshdir, "id_dsa")); //$NON-NLS-1$
- }
- }
-
- private static void loadIdentity(final JSch sch, final File priv) {
- if (priv.isFile()) {
- try {
- sch.addIdentity(priv.getAbsolutePath());
- } catch (JSchException e) {
- // Instead, pretend the key doesn't exist.
- }
- }
- }
- }
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