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// Copyright (C) 2008 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.sshd;
import com.google.common.io.BaseEncoding;
import com.google.gerrit.entities.Account;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.account.AccountSshKey;
import com.google.gerrit.sshd.BaseCommand.Failure;
import com.google.gerrit.sshd.SshScope.Context;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PublicKey;
import java.security.interfaces.DSAPublicKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import org.apache.sshd.common.SshException;
import org.apache.sshd.common.io.IoAcceptor;
import org.apache.sshd.common.io.IoSession;
import org.apache.sshd.common.keyprovider.KeyPairProvider;
import org.apache.sshd.common.session.helpers.AbstractSession;
import org.apache.sshd.common.util.buffer.ByteArrayBuffer;
import org.apache.sshd.server.session.ServerSession;
/** Utilities to support SSH operations. */
public class SshUtil {
/**
* Parse a public key into its Java type.
*
* @param key the account key to parse.
* @return the valid public key object.
* @throws InvalidKeySpecException the key supplied is not a valid SSH key.
* @throws NoSuchAlgorithmException the JVM is missing the key algorithm.
* @throws NoSuchProviderException the JVM is missing the provider.
*/
public static PublicKey parse(AccountSshKey key)
throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchProviderException {
try {
final String s = key.encodedKey();
if (s == null) {
throw new InvalidKeySpecException("No key string");
}
final byte[] bin = BaseEncoding.base64().decode(s);
String publicKeyAlgo = new ByteArrayBuffer(bin).getString();
PublicKey publicKey = new ByteArrayBuffer(bin).getRawPublicKey();
if (!key.algorithm().equals(publicKeyAlgo)) {
throw new InvalidKeyAlgorithmException(key.algorithm(), publicKeyAlgo, publicKey);
}
return publicKey;
} catch (RuntimeException | SshException e) {
throw new InvalidKeySpecException("Cannot parse key", e);
}
}
/**
* Convert an RFC 4716 style key to an OpenSSH style key.
*
* @param keyStr the key string to convert.
* @return {@code keyStr} if conversion failed; otherwise the converted key, in OpenSSH key
* format.
*/
public static String toOpenSshPublicKey(String keyStr) {
try {
final StringBuilder strBuf = new StringBuilder();
final BufferedReader br = new BufferedReader(new StringReader(keyStr));
String line = br.readLine(); // BEGIN SSH2 line...
if (line == null || !line.equals("---- BEGIN SSH2 PUBLIC KEY ----")) {
return keyStr;
}
while ((line = br.readLine()) != null) {
if (line.indexOf(':') == -1) {
strBuf.append(line);
break;
}
}
while ((line = br.readLine()) != null) {
if (line.startsWith("---- ")) {
break;
}
strBuf.append(line);
}
final PublicKey key =
new ByteArrayBuffer(BaseEncoding.base64().decode(strBuf.toString())).getRawPublicKey();
if (key instanceof RSAPublicKey) {
strBuf.insert(0, KeyPairProvider.SSH_RSA + " ");
} else if (key instanceof DSAPublicKey) {
strBuf.insert(0, KeyPairProvider.SSH_DSS + " ");
} else {
return keyStr;
}
strBuf.append(' ');
strBuf.append("converted-key");
return strBuf.toString();
} catch (IOException | RuntimeException e) {
return keyStr;
}
}
public static boolean success(
final String username,
final ServerSession session,
final SshScope sshScope,
final SshLog sshLog,
final SshSession sd,
final CurrentUser user) {
if (sd.getUser() == null) {
sd.authenticationSuccess(username, user);
// If this is the first time we've authenticated this
// session, record a login event in the log and add
// a close listener to record a logout event.
//
Context ctx = sshScope.newContext(sd, null);
Context old = sshScope.set(ctx);
try {
sshLog.onLogin();
} finally {
sshScope.set(old);
}
session.addCloseFutureListener(
future -> {
final Context ctx1 = sshScope.newContext(sd, null);
final Context old1 = sshScope.set(ctx1);
try {
sshLog.onLogout();
} finally {
sshScope.set(old1);
}
});
}
return true;
}
public static IdentifiedUser createUser(
final SshSession sd,
final IdentifiedUser.GenericFactory userFactory,
final Account.Id account) {
return userFactory.create(sd.getRemoteAddress(), account);
}
public static void forEachSshSession(SshDaemon sshDaemon, SessionConsumer consumer)
throws Failure {
IoAcceptor ioAcceptor = sshDaemon.getIoAcceptor();
if (ioAcceptor == null) {
throw new Failure(1, "fatal: sshd no longer running");
}
ioAcceptor
.getManagedSessions()
.forEach(
(id, ioSession) -> {
AbstractSession abstractSession = AbstractSession.getSession(ioSession, true);
if (abstractSession != null) {
SshSession sshSession = abstractSession.getAttribute(SshSession.KEY);
if (sshSession != null) {
consumer.accept(id, sshSession, abstractSession, ioSession);
}
}
});
}
@FunctionalInterface
public interface SessionConsumer {
public void accept(
Long id, SshSession sshSession, AbstractSession abstractSession, IoSession ioSession);
}
}
