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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 com.google.common.io.RecursiveDeleteOption.ALLOW_INSECURE;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.io.CharSink;
import com.google.common.io.Files;
import com.google.common.io.MoreFiles;
import com.google.gerrit.acceptance.testsuite.account.TestAccount;
import com.google.gerrit.acceptance.testsuite.account.TestSshKeys;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.security.GeneralSecurityException;
import java.security.InvalidAlgorithmParameterException;
import java.security.KeyPairGenerator;
import java.security.spec.InvalidKeySpecException;
import java.util.Arrays;
import java.util.Scanner;
import org.apache.sshd.common.cipher.ECCurves;
import org.apache.sshd.common.config.keys.KeyUtils;
import org.apache.sshd.common.config.keys.writer.openssh.OpenSSHKeyPairResourceWriter;
import org.apache.sshd.common.util.security.SecurityUtils;
import org.eclipse.jgit.transport.SshSessionFactory;
import org.eclipse.jgit.transport.URIish;
import org.eclipse.jgit.transport.sshd.DefaultProxyDataFactory;
import org.eclipse.jgit.transport.sshd.JGitKeyCache;
import org.eclipse.jgit.transport.sshd.SshdSession;
import org.eclipse.jgit.transport.sshd.SshdSessionFactory;
import org.eclipse.jgit.util.FS;
public class SshSessionMina extends SshSession {
private static final int TIMEOUT = 100000;
private SshdSession session;
public static void initClient() {
JGitKeyCache keyCache = new JGitKeyCache();
SshdSessionFactory factory = new SshdSessionFactory(keyCache, new DefaultProxyDataFactory());
SshSessionFactory.setInstance(factory);
}
public static KeyPairGenerator initKeyPairGenerator()
throws GeneralSecurityException, InvalidKeySpecException, InvalidAlgorithmParameterException {
int size = 256;
KeyPairGenerator gen = SecurityUtils.getKeyPairGenerator(KeyUtils.EC_ALGORITHM);
ECCurves curve = ECCurves.fromCurveSize(size);
if (curve == null) {
throw new InvalidKeySpecException("Unknown curve for key size=" + size);
}
gen.initialize(curve.getParameters());
return gen;
}
public SshSessionMina(TestSshKeys sshKeys, InetSocketAddress addr, TestAccount account) {
super(sshKeys, addr, account);
}
@Override
public void open() throws Exception {
getMinaSession();
}
@Override
public void close() {
if (session != null) {
session.disconnect();
session = null;
}
}
@SuppressWarnings("resource")
@Override
public String exec(String command) throws Exception {
Process process = getMinaSession().exec(command, TIMEOUT);
InputStream in = process.getInputStream();
InputStream err = process.getErrorStream();
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() : "";
}
@SuppressWarnings("resource")
@Override
public int execAndReturnStatus(String command) throws Exception {
Process process = getMinaSession().exec(command, 0);
InputStream in = process.getInputStream();
InputStream err = process.getErrorStream();
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");
try {
return process.exitValue();
} catch (IllegalThreadStateException e) {
// SSH command was interrupted
return -1;
}
}
private SshdSession getMinaSession() throws Exception {
if (session == null) {
String username = getUsername();
URIish uri =
new URIish(
"ssh://"
+ username
+ "@"
+ addr.getAddress().getHostAddress()
+ ":"
+ addr.getPort());
// TODO(davido): Switch to memory only key resolving mode.
File userhome = Files.createTempDir();
FS fs = FS.DETECTED.setUserHome(userhome);
File sshDir = new File(userhome, ".ssh");
sshDir.mkdir();
OpenSSHKeyPairResourceWriter keyPairWriter = new OpenSSHKeyPairResourceWriter();
try (OutputStream out = new FileOutputStream(new File(sshDir, "id_ecdsa"))) {
keyPairWriter.writePrivateKey(sshKeys.getKeyPair(account), null, null, out);
}
// TODO(davido): Disable programmatically host key checking: "StrictHostKeyChecking: no" mode.
CharSink configFile = Files.asCharSink(new File(sshDir, "config"), UTF_8);
configFile.writeLines(Arrays.asList("Host *", "StrictHostKeyChecking no"));
JGitKeyCache keyCache = new JGitKeyCache();
try (SshdSessionFactory factory =
new SshdSessionFactory(keyCache, new DefaultProxyDataFactory())) {
factory.setHomeDirectory(userhome);
factory.setSshDirectory(sshDir);
session = factory.getSession(uri, null, fs, TIMEOUT);
session.addCloseListener(
future -> {
try {
MoreFiles.deleteRecursively(userhome.toPath(), ALLOW_INSECURE);
} catch (IOException e) {
e.printStackTrace();
}
});
}
}
return session;
}
}
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