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// Copyright (C) 2021 The Android Open Source Project
//
// 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.google.gerrit.acceptance;
import static java.nio.charset.StandardCharsets.US_ASCII;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.gerrit.acceptance.testsuite.account.TestAccount;
import com.google.gerrit.acceptance.testsuite.account.TestSshKeys;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringWriter;
import java.net.InetSocketAddress;
import java.nio.charset.StandardCharsets;
import java.security.GeneralSecurityException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Properties;
import java.util.Scanner;
import org.bouncycastle.openssl.jcajce.JcaPEMWriter;
import org.bouncycastle.openssl.jcajce.JcaPKCS8Generator;
import org.bouncycastle.util.io.pem.PemObject;
import org.eclipse.jgit.transport.SshSessionFactory;
import org.eclipse.jgit.transport.ssh.jsch.JschConfigSessionFactory;
import org.eclipse.jgit.transport.ssh.jsch.OpenSshConfig.Host;
import org.eclipse.jgit.util.FS;
public class SshSessionJsch extends SshSession {
private Session session;
public static void initClient(KeyPair keyPair) {
Properties config = new Properties();
config.put("StrictHostKeyChecking", "no");
JSch.setConfig(config);
// register a JschConfigSessionFactory that adds the private key as identity
// to the JSch instance of JGit so that SSH communication via JGit can
// succeed
SshSessionFactory.setInstance(
new JschConfigSessionFactory() {
@Override
protected void configure(Host hc, Session session) {
try {
JSch jsch = getJSch(hc, FS.DETECTED);
jsch.addIdentity(
"KeyPair", privateKey(keyPair), TestSshKeys.publicKeyBlob(keyPair), null);
} catch (JSchException | GeneralSecurityException | IOException e) {
throw new RuntimeException(e);
}
}
});
}
public static KeyPairGenerator initKeyPairGenerator() throws NoSuchAlgorithmException {
KeyPairGenerator gen;
gen = KeyPairGenerator.getInstance("RSA");
gen.initialize(512, new SecureRandom());
return gen;
}
public SshSessionJsch(TestSshKeys sshKeys, InetSocketAddress addr, TestAccount account) {
super(sshKeys, addr, account);
}
@Override
public void open() throws Exception {
getJschSession();
}
@Override
public void close() {
if (session != null) {
session.disconnect();
session = null;
}
}
@SuppressWarnings("resource")
@Override
public String exec(String command) throws Exception {
ChannelExec channel = (ChannelExec) getJschSession().openChannel("exec");
try {
channel.setCommand(command);
InputStream in = channel.getInputStream();
InputStream err = channel.getErrStream();
channel.connect();
Scanner s = new Scanner(err, UTF_8.name()).useDelimiter("\\A");
error = s.hasNext() ? s.next() : null;
s = new Scanner(in, UTF_8.name()).useDelimiter("\\A");
return s.hasNext() ? s.next() : "";
} finally {
channel.disconnect();
}
}
@SuppressWarnings("resource")
@Override
public int execAndReturnStatus(String command) throws Exception {
ChannelExec channel = (ChannelExec) getJschSession().openChannel("exec");
try {
channel.setCommand(command);
InputStream err = channel.getErrStream();
channel.connect();
Scanner s = new Scanner(err, UTF_8.name()).useDelimiter("\\A");
error = s.hasNext() ? s.next() : null;
return channel.getExitStatus();
} finally {
channel.disconnect();
}
}
@Override
public Reader execAndReturnReader(String command) throws Exception {
ChannelExec channel = (ChannelExec) getJschSession().openChannel("exec");
channel.setCommand(command);
channel.connect();
return new InputStreamReader(channel.getInputStream(), StandardCharsets.UTF_8) {
@Override
public void close() throws IOException {
super.close();
channel.disconnect();
}
};
}
private Session getJschSession() throws Exception {
if (session == null) {
KeyPair keyPair = sshKeys.getKeyPair(account);
JSch jsch = new JSch();
jsch.addIdentity("KeyPair", privateKey(keyPair), TestSshKeys.publicKeyBlob(keyPair), null);
String username = getUsername();
session = jsch.getSession(username, addr.getAddress().getHostAddress(), addr.getPort());
session.setConfig("StrictHostKeyChecking", "no");
session.connect();
}
return session;
}
private static byte[] privateKey(KeyPair keyPair) throws IOException {
// unencrypted form of PKCS#8 file
JcaPKCS8Generator gen1 = new JcaPKCS8Generator(keyPair.getPrivate(), null);
PemObject obj1 = gen1.generate();
StringWriter sw1 = new StringWriter();
try (JcaPEMWriter pw = new JcaPEMWriter(sw1)) {
pw.writeObject(obj1);
}
return sw1.toString().getBytes(US_ASCII.name());
}
}
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