/*
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* Copyright 2014 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gitblit.transport.ssh;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.OutputStreamWriter;
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import java.net.InetSocketAddress;
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import java.security.KeyPair;
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import java.security.KeyPairGenerator;
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import java.text.MessageFormat;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Locale;
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import java.util.concurrent.atomic.AtomicBoolean;
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import org.apache.sshd.SshServer;
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import org.apache.sshd.common.NamedFactory;
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import org.apache.sshd.common.io.IoServiceFactoryFactory;
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import org.apache.sshd.common.io.mina.MinaServiceFactoryFactory;
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import org.apache.sshd.common.io.nio2.Nio2ServiceFactoryFactory;
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import org.apache.sshd.common.keyprovider.FileKeyPairProvider;
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import org.apache.sshd.common.util.SecurityUtils;
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import org.apache.sshd.server.UserAuth;
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import org.apache.sshd.server.auth.CachingPublicKeyAuthenticator;
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import org.apache.sshd.server.auth.UserAuthKeyboardInteractive;
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import org.apache.sshd.server.auth.UserAuthPassword;
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import org.apache.sshd.server.auth.UserAuthPublicKey;
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import org.apache.sshd.server.auth.gss.GSSAuthenticator;
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import org.apache.sshd.server.auth.gss.UserAuthGSS;
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import org.bouncycastle.openssl.PEMWriter;
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import org.eclipse.jgit.internal.JGitText;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.gitblit.Constants;
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import com.gitblit.IStoredSettings;
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import com.gitblit.Keys;
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import com.gitblit.manager.IGitblit;
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import com.gitblit.transport.ssh.commands.SshCommandFactory;
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import com.gitblit.utils.JnaUtils;
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import com.gitblit.utils.StringUtils;
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import com.gitblit.utils.WorkQueue;
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import com.google.common.io.Files;
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/**
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* Manager for the ssh transport. Roughly analogous to the
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* {@link com.gitblit.transport.git.GitDaemon} class.
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*
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*/
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public class SshDaemon {
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private final Logger log = LoggerFactory.getLogger(SshDaemon.class);
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public static enum SshSessionBackend {
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MINA, NIO2
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}
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/**
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* 22: IANA assigned port number for ssh. Note that this is a distinct
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* concept from gitblit's default conf for ssh port -- this "default" is
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* what the git protocol itself defaults to if it sees and ssh url without a
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* port.
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*/
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public static final int DEFAULT_PORT = 22;
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private final AtomicBoolean run;
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private final IGitblit gitblit;
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private final SshServer sshd;
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/**
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* Construct the Gitblit SSH daemon.
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*
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* @param gitblit
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* @param workQueue
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*/
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public SshDaemon(IGitblit gitblit, WorkQueue workQueue) {
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this.gitblit = gitblit;
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IStoredSettings settings = gitblit.getSettings();
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// Ensure that Bouncy Castle is our JCE provider
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SecurityUtils.setRegisterBouncyCastle(true);
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if (SecurityUtils.isBouncyCastleRegistered()) {
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log.debug("BouncyCastle is registered as a JCE provider");
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}
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// Generate host RSA and DSA keypairs and create the host keypair provider
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File rsaKeyStore = new File(gitblit.getBaseFolder(), "ssh-rsa-hostkey.pem");
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File dsaKeyStore = new File(gitblit.getBaseFolder(), "ssh-dsa-hostkey.pem");
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generateKeyPair(rsaKeyStore, "RSA", 2048);
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generateKeyPair(dsaKeyStore, "DSA", 0);
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FileKeyPairProvider hostKeyPairProvider = new FileKeyPairProvider();
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hostKeyPairProvider.setFiles(new String [] { rsaKeyStore.getPath(), dsaKeyStore.getPath(), dsaKeyStore.getPath() });
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// Client public key authenticator
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SshKeyAuthenticator keyAuthenticator =
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new SshKeyAuthenticator(gitblit.getPublicKeyManager(), gitblit);
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// Configure the preferred SSHD backend
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String sshBackendStr = settings.getString(Keys.git.sshBackend,
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SshSessionBackend.NIO2.name());
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SshSessionBackend backend = SshSessionBackend.valueOf(sshBackendStr);
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System.setProperty(IoServiceFactoryFactory.class.getName(),
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backend == SshSessionBackend.MINA
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? MinaServiceFactoryFactory.class.getName()
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: Nio2ServiceFactoryFactory.class.getName());
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// Create the socket address for binding the SSH server
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int port = settings.getInteger(Keys.git.sshPort, 0);
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String bindInterface = settings.getString(Keys.git.sshBindInterface, "");
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InetSocketAddress addr;
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if (StringUtils.isEmpty(bindInterface)) {
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addr = new InetSocketAddress(port);
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} else {
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addr = new InetSocketAddress(bindInterface, port);
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}
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//Will do GSS ?
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GSSAuthenticator gssAuthenticator = null;
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if(settings.getBoolean(Keys.git.sshWithKrb5, false)) {
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gssAuthenticator = new SshKrbAuthenticator(gitblit);
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String keytabString = settings.getString(Keys.git.sshKrb5Keytab,
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"");
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if(! keytabString.isEmpty()) {
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gssAuthenticator.setKeytabFile(keytabString);
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}
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String servicePrincipalName = settings.getString(Keys.git.sshKrb5ServicePrincipalName,
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"");
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if(! servicePrincipalName.isEmpty()) {
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gssAuthenticator.setServicePrincipalName(servicePrincipalName);
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}
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}
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//Sort the authenticators for sshd
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List<NamedFactory<UserAuth>> userAuthFactories = new ArrayList<>();
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String sshAuthenticatorsOrderString = settings.getString(Keys.git.sshAuthenticatorsOrder,
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"password,keyboard-interactive,publickey");
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for(String authenticator: sshAuthenticatorsOrderString.split(",")) {
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String authenticatorName = authenticator.trim().toLowerCase(Locale.US);
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switch (authenticatorName) {
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case "gssapi-with-mic":
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if(gssAuthenticator != null) {
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userAuthFactories.add(new UserAuthGSS.Factory());
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}
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break;
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case "publickey":
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userAuthFactories.add(new UserAuthPublicKey.Factory());
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break;
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case "password":
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userAuthFactories.add(new UserAuthPassword.Factory());
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break;
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case "keyboard-interactive":
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userAuthFactories.add(new UserAuthKeyboardInteractive.Factory());
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break;
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default:
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log.error("Unknown ssh authenticator: '{}'", authenticatorName);
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}
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}
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// Create the SSH server
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sshd = SshServer.setUpDefaultServer();
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sshd.setPort(addr.getPort());
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sshd.setHost(addr.getHostName());
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sshd.setKeyPairProvider(hostKeyPairProvider);
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sshd.setPublickeyAuthenticator(new CachingPublicKeyAuthenticator(keyAuthenticator));
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sshd.setPasswordAuthenticator(new UsernamePasswordAuthenticator(gitblit));
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if(gssAuthenticator != null) {
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sshd.setGSSAuthenticator(gssAuthenticator);
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}
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sshd.setUserAuthFactories(userAuthFactories);
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sshd.setSessionFactory(new SshServerSessionFactory());
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sshd.setFileSystemFactory(new DisabledFilesystemFactory());
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sshd.setTcpipForwardingFilter(new NonForwardingFilter());
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sshd.setCommandFactory(new SshCommandFactory(gitblit, workQueue));
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sshd.setShellFactory(new WelcomeShell(settings));
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// Set the server id. This can be queried with:
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// ssh-keyscan -t rsa,dsa -p 29418 localhost
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String version = String.format("%s (%s-%s)", Constants.getGitBlitVersion().replace(' ', '_'),
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sshd.getVersion(), sshBackendStr);
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sshd.getProperties().put(SshServer.SERVER_IDENTIFICATION, version);
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run = new AtomicBoolean(false);
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}
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public String formatUrl(String gituser, String servername, String repository) {
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IStoredSettings settings = gitblit.getSettings();
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int port = sshd.getPort();
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int displayPort = settings.getInteger(Keys.git.sshAdvertisedPort, port);
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String displayServername = settings.getString(Keys.git.sshAdvertisedHost, "");
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if(displayServername.isEmpty()) {
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displayServername = servername;
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}
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if (displayPort == DEFAULT_PORT) {
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// standard port
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return MessageFormat.format("ssh://{0}@{1}/{2}", gituser, displayServername,
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repository);
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} else {
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// non-standard port
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return MessageFormat.format("ssh://{0}@{1}:{2,number,0}/{3}",
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gituser, displayServername, displayPort, repository);
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}
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}
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/**
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* Start this daemon on a background thread.
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*
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* @throws IOException
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* the server socket could not be opened.
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* @throws IllegalStateException
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* the daemon is already running.
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*/
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public synchronized void start() throws IOException {
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if (run.get()) {
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throw new IllegalStateException(JGitText.get().daemonAlreadyRunning);
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}
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sshd.start();
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run.set(true);
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String sshBackendStr = gitblit.getSettings().getString(Keys.git.sshBackend,
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SshSessionBackend.NIO2.name());
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log.info(MessageFormat.format(
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"SSH Daemon ({0}) is listening on {1}:{2,number,0}",
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sshBackendStr, sshd.getHost(), sshd.getPort()));
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}
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/** @return true if this daemon is receiving connections. */
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public boolean isRunning() {
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return run.get();
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}
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/** Stop this daemon. */
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public synchronized void stop() {
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if (run.get()) {
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log.info("SSH Daemon stopping...");
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run.set(false);
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try {
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((SshCommandFactory) sshd.getCommandFactory()).stop();
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sshd.stop();
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} catch (InterruptedException e) {
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log.error("SSH Daemon stop interrupted", e);
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}
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}
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}
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private void generateKeyPair(File file, String algorithm, int keySize) {
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if (file.exists()) {
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return;
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}
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try {
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KeyPairGenerator generator = SecurityUtils.getKeyPairGenerator(algorithm);
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if (keySize != 0) {
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generator.initialize(keySize);
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log.info("Generating {}-{} SSH host keypair...", algorithm, keySize);
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} else {
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log.info("Generating {} SSH host keypair...", algorithm);
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}
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KeyPair kp = generator.generateKeyPair();
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// create an empty file and set the permissions
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Files.touch(file);
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try {
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JnaUtils.setFilemode(file, JnaUtils.S_IRUSR | JnaUtils.S_IWUSR);
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} catch (UnsatisfiedLinkError | UnsupportedOperationException e) {
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// Unexpected/Unsupported OS or Architecture
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}
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FileOutputStream os = new FileOutputStream(file);
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PEMWriter w = new PEMWriter(new OutputStreamWriter(os));
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w.writeObject(kp);
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w.flush();
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w.close();
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} catch (Exception e) {
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log.warn(MessageFormat.format("Unable to generate {0} keypair", algorithm), e);
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return;
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}
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}
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}
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