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/*-
* ============LICENSE_START=======================================================
* openECOMP : APP-C
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights
* reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.appc.adapter.ssh.sshd;
import org.apache.sshd.ClientChannel;
import org.apache.sshd.ClientSession;
import org.apache.sshd.SshClient;
import org.apache.sshd.client.channel.ChannelExec;
import org.apache.sshd.client.future.AuthFuture;
import org.apache.sshd.client.future.OpenFuture;
import org.apache.sshd.common.KeyPairProvider;
import org.apache.sshd.common.keyprovider.FileKeyPairProvider;
import org.openecomp.appc.adapter.ssh.SshConnection;
import org.openecomp.appc.adapter.ssh.SshException;
import org.openecomp.appc.encryption.EncryptionTool;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
import java.io.OutputStream;
import java.security.KeyPair;
/**
* Implementation of SshConnection interface based on Apache MINA SSHD library.
*/
class SshConnectionSshd implements SshConnection {
private static final EELFLogger logger = EELFManager.getInstance().getApplicationLogger();
private static final long AUTH_TIMEOUT = 60000;
private static final long EXEC_TIMEOUT = 120000;
private String host;
private int port;
private String username;
private String password;
private long timeout = EXEC_TIMEOUT;
private String keyFile;
private SshClient sshClient;
private ClientSession clientSession;
public SshConnectionSshd(String host, int port, String username, String password, String keyFile) {
this.host = host;
this.port = port;
this.username = username;
this.password = password;
this.keyFile = keyFile;
}
public SshConnectionSshd(String host, int port, String username, String password) {
this(host, port, username, password, null);
}
public SshConnectionSshd(String host, int port, String keyFile) {
this(host, port, null, null, keyFile);
}
@Override
public void connect() {
sshClient = SshClient.setUpDefaultClient();
sshClient.start();
try {
clientSession = sshClient.connect(EncryptionTool.getInstance().decrypt(username), host, port).await().getSession();
if(password != null) {
clientSession.addPasswordIdentity(EncryptionTool.getInstance().decrypt(password));
}
if(keyFile != null) {
KeyPairProvider keyPairProvider = new FileKeyPairProvider(new String[]{keyFile});
KeyPair keyPair = keyPairProvider.loadKeys().iterator().next();
clientSession.addPublicKeyIdentity(keyPair);
}
AuthFuture authFuture = clientSession.auth();
authFuture.await(AUTH_TIMEOUT);
if(!authFuture.isSuccess()) {
throw new SshException("Error establishing ssh connection to [" + username + "@" + host + ":" + port + "]. Authentication failed.");
}
} catch(RuntimeException e) {
throw e;
} catch(Exception e) {
throw new SshException("Error establishing ssh connection to [" + username + "@" + host + ":" + port + "].", e);
}
if(logger.isDebugEnabled()) {
logger.debug("SSH: connected to [" + toString() + "]");
}
}
@Override
public void disconnect() {
try {
if(logger.isDebugEnabled()) {
logger.debug("SSH: disconnecting from [" + toString() + "]");
}
clientSession.close(false);
} finally {
if(sshClient != null) {
sshClient.stop();
}
}
}
@Override
public void setExecTimeout(long timeout) {
this.timeout = timeout;
}
@Override
public int execCommand(String cmd, OutputStream out, OutputStream err) {
return execCommand(cmd, out, err, false);
}
@Override
public int execCommandWithPty(String cmd, OutputStream out) {
return execCommand(cmd, out, out, true);
}
private int execCommand(String cmd, OutputStream out, OutputStream err, boolean usePty) {
try {
if(logger.isDebugEnabled()) {
logger.debug("SSH: executing command");
}
ChannelExec client = clientSession.createExecChannel(cmd);
client.setUsePty(usePty); // use pseudo-tty?
client.setOut(out);
client.setErr(err);
OpenFuture openFuture = client.open();
int exitStatus = 0;
try {
client.waitFor(ClientChannel.CLOSED, timeout);
openFuture.verify();
Integer exitStatusI = client.getExitStatus();
if(exitStatusI == null) {
throw new SshException("Error executing command [" + cmd + "] over SSH [" + username + "@" + host + ":" + port + "]. Operation timed out.");
}
exitStatus = exitStatusI;
} finally {
client.close(false);
}
return exitStatus;
} catch(RuntimeException e) {
throw e;
} catch(Exception t) {
throw new SshException("Error executing command [" + cmd + "] over SSH [" + username + "@" + host + ":" + port + "]", t);
}
}
@Override
public String toString() {
String address = host;
if(username != null) {
address = username + '@' +address;
}
return address;
}
}
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