/*
|
* Copyright 2014 gitblit.com.
|
*
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
* you may not use this file except in compliance with the License.
|
* You may obtain a copy of the License at
|
*
|
* http://www.apache.org/licenses/LICENSE-2.0
|
*
|
* Unless required by applicable law or agreed to in writing, software
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
* See the License for the specific language governing permissions and
|
* limitations under the License.
|
*/
|
package com.gitblit.transport.ssh;
|
|
import java.io.IOException;
|
import java.net.InetSocketAddress;
|
import java.net.SocketAddress;
|
import java.security.InvalidKeyException;
|
import java.util.Arrays;
|
import java.util.Iterator;
|
import java.util.LinkedList;
|
import java.util.List;
|
|
import javax.inject.Inject;
|
|
import org.apache.mina.core.future.IoFuture;
|
import org.apache.mina.core.future.IoFutureListener;
|
import org.apache.mina.core.session.IoSession;
|
import org.apache.mina.transport.socket.SocketSessionConfig;
|
import org.apache.sshd.SshServer;
|
import org.apache.sshd.common.Channel;
|
import org.apache.sshd.common.Cipher;
|
import org.apache.sshd.common.Compression;
|
import org.apache.sshd.common.KeyExchange;
|
import org.apache.sshd.common.KeyPairProvider;
|
import org.apache.sshd.common.Mac;
|
import org.apache.sshd.common.NamedFactory;
|
import org.apache.sshd.common.Session;
|
import org.apache.sshd.common.Signature;
|
import org.apache.sshd.common.cipher.AES128CBC;
|
import org.apache.sshd.common.cipher.AES192CBC;
|
import org.apache.sshd.common.cipher.AES256CBC;
|
import org.apache.sshd.common.cipher.BlowfishCBC;
|
import org.apache.sshd.common.cipher.TripleDESCBC;
|
import org.apache.sshd.common.compression.CompressionNone;
|
import org.apache.sshd.common.mac.HMACMD5;
|
import org.apache.sshd.common.mac.HMACMD596;
|
import org.apache.sshd.common.mac.HMACSHA1;
|
import org.apache.sshd.common.mac.HMACSHA196;
|
import org.apache.sshd.common.random.BouncyCastleRandom;
|
import org.apache.sshd.common.random.SingletonRandomFactory;
|
import org.apache.sshd.common.signature.SignatureDSA;
|
import org.apache.sshd.common.signature.SignatureRSA;
|
import org.apache.sshd.common.util.SecurityUtils;
|
import org.apache.sshd.server.CommandFactory;
|
import org.apache.sshd.server.FileSystemFactory;
|
import org.apache.sshd.server.FileSystemView;
|
import org.apache.sshd.server.ForwardingFilter;
|
import org.apache.sshd.server.PublickeyAuthenticator;
|
import org.apache.sshd.server.SshFile;
|
import org.apache.sshd.server.UserAuth;
|
import org.apache.sshd.server.auth.UserAuthPublicKey;
|
import org.apache.sshd.server.channel.ChannelDirectTcpip;
|
import org.apache.sshd.server.channel.ChannelSession;
|
import org.apache.sshd.server.kex.DHG1;
|
import org.apache.sshd.server.kex.DHG14;
|
import org.apache.sshd.server.session.ServerSession;
|
import org.apache.sshd.server.session.SessionFactory;
|
import org.slf4j.Logger;
|
import org.slf4j.LoggerFactory;
|
|
import com.gitblit.utils.IdGenerator;
|
|
/**
|
*
|
* @author Eric Myhre
|
*
|
*/
|
public class SshCommandServer extends SshServer {
|
|
private static final Logger log = LoggerFactory.getLogger(SshCommandServer.class);
|
|
@Inject
|
public SshCommandServer(final IdGenerator idGenerator) {
|
setSessionFactory(new SessionFactory() {
|
@Override
|
protected ServerSession createSession(final IoSession io) throws Exception {
|
log.info("connection accepted on " + io);
|
|
if (io.getConfig() instanceof SocketSessionConfig) {
|
final SocketSessionConfig c = (SocketSessionConfig) io.getConfig();
|
c.setKeepAlive(true);
|
}
|
|
final ServerSession s = (ServerSession) super.createSession(io);
|
SocketAddress peer = io.getRemoteAddress();
|
SshSession session = new SshSession(idGenerator.next(), peer);
|
s.setAttribute(SshSession.KEY, session);
|
|
io.getCloseFuture().addListener(new IoFutureListener<IoFuture>() {
|
@Override
|
public void operationComplete(IoFuture future) {
|
log.info("connection closed on " + io);
|
}
|
});
|
return s;
|
}
|
});
|
}
|
|
/**
|
* Performs most of default configuration (setup random sources, setup ciphers,
|
* etc; also, support for forwarding and filesystem is explicitly disallowed).
|
*
|
* {@link #setKeyPairProvider(KeyPairProvider)} and
|
* {@link #setPublickeyAuthenticator(PublickeyAuthenticator)} are left for you.
|
* And applying {@link #setCommandFactory(CommandFactory)} is probably wise if you
|
* want something to actually happen when users do successfully authenticate.
|
*/
|
@SuppressWarnings("unchecked")
|
public void setup() {
|
if (!SecurityUtils.isBouncyCastleRegistered())
|
throw new RuntimeException("BC crypto not available");
|
|
setKeyExchangeFactories(Arrays.<NamedFactory<KeyExchange>>asList(
|
new DHG14.Factory(),
|
new DHG1.Factory())
|
);
|
|
setRandomFactory(new SingletonRandomFactory(new BouncyCastleRandom.Factory()));
|
|
setupCiphers();
|
|
setCompressionFactories(Arrays.<NamedFactory<Compression>>asList(
|
new CompressionNone.Factory())
|
);
|
|
setMacFactories(Arrays.<NamedFactory<Mac>>asList(
|
new HMACMD5.Factory(),
|
new HMACSHA1.Factory(),
|
new HMACMD596.Factory(),
|
new HMACSHA196.Factory())
|
);
|
|
setChannelFactories(Arrays.<NamedFactory<Channel>>asList(
|
new ChannelSession.Factory(),
|
new ChannelDirectTcpip.Factory())
|
);
|
|
setSignatureFactories(Arrays.<NamedFactory<Signature>>asList(
|
new SignatureDSA.Factory(),
|
new SignatureRSA.Factory())
|
);
|
|
setFileSystemFactory(new FileSystemFactory() {
|
@Override
|
public FileSystemView createFileSystemView(Session session) throws IOException {
|
return new FileSystemView() {
|
@Override
|
public SshFile getFile(SshFile baseDir, String file) {
|
return null;
|
}
|
|
@Override
|
public SshFile getFile(String file) {
|
return null;
|
}
|
};
|
}
|
});
|
|
setForwardingFilter(new ForwardingFilter() {
|
@Override
|
public boolean canForwardAgent(ServerSession session) {
|
return false;
|
}
|
|
@Override
|
public boolean canForwardX11(ServerSession session) {
|
return false;
|
}
|
|
@Override
|
public boolean canConnect(InetSocketAddress address, ServerSession session) {
|
return false;
|
}
|
|
@Override
|
public boolean canListen(InetSocketAddress address, ServerSession session) {
|
return false;
|
}
|
});
|
|
setUserAuthFactories(Arrays.<NamedFactory<UserAuth>>asList(
|
new UserAuthPublicKey.Factory())
|
);
|
}
|
|
protected void setupCiphers() {
|
List<NamedFactory<Cipher>> avail = new LinkedList<NamedFactory<Cipher>>();
|
avail.add(new AES128CBC.Factory());
|
avail.add(new TripleDESCBC.Factory());
|
avail.add(new BlowfishCBC.Factory());
|
avail.add(new AES192CBC.Factory());
|
avail.add(new AES256CBC.Factory());
|
|
for (Iterator<NamedFactory<Cipher>> i = avail.iterator(); i.hasNext();) {
|
final NamedFactory<Cipher> f = i.next();
|
try {
|
final Cipher c = f.create();
|
final byte[] key = new byte[c.getBlockSize()];
|
final byte[] iv = new byte[c.getIVSize()];
|
c.init(Cipher.Mode.Encrypt, key, iv);
|
} catch (InvalidKeyException e) {
|
i.remove();
|
} catch (Exception e) {
|
i.remove();
|
}
|
}
|
setCipherFactories(avail);
|
}
|
}
|
