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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.FileInputStream;
import java.io.InputStreamReader;
import java.security.KeyPair;
import java.util.Arrays;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.apache.sshd.common.keyprovider.AbstractKeyPairProvider;
import org.apache.sshd.common.util.SecurityUtils;
import org.bouncycastle.openssl.PEMDecryptorProvider;
import org.bouncycastle.openssl.PEMEncryptedKeyPair;
import org.bouncycastle.openssl.PEMKeyPair;
import org.bouncycastle.openssl.PEMParser;
import org.bouncycastle.openssl.PasswordFinder;
import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;
import org.bouncycastle.openssl.jcajce.JcePEMDecryptorProviderBuilder;
/**
* This host key provider loads private keys from the specified files.
*
* Note that this class has a direct dependency on BouncyCastle and won't work
* unless it has been correctly registered as a security provider.
*
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public class FileKeyPairProvider extends AbstractKeyPairProvider {
private String[] files;
private PasswordFinder passwordFinder;
public FileKeyPairProvider() {
}
public FileKeyPairProvider(String[] files) {
this.files = files;
}
public FileKeyPairProvider(String[] files, PasswordFinder passwordFinder) {
this.files = files;
this.passwordFinder = passwordFinder;
}
public String[] getFiles() {
return files;
}
public void setFiles(String[] files) {
this.files = files;
}
public PasswordFinder getPasswordFinder() {
return passwordFinder;
}
public void setPasswordFinder(PasswordFinder passwordFinder) {
this.passwordFinder = passwordFinder;
}
public Iterable<KeyPair> loadKeys() {
if (!SecurityUtils.isBouncyCastleRegistered()) {
throw new IllegalStateException("BouncyCastle must be registered as a JCE provider");
}
return new Iterable<KeyPair>() {
@Override
public Iterator<KeyPair> iterator() {
return new Iterator<KeyPair>() {
private final Iterator<String> iterator = Arrays.asList(files).iterator();
private KeyPair nextKeyPair;
private boolean nextKeyPairSet = false;
@Override
public boolean hasNext() {
return nextKeyPairSet || setNextObject();
}
@Override
public KeyPair next() {
if (!nextKeyPairSet) {
if (!setNextObject()) {
throw new NoSuchElementException();
}
}
nextKeyPairSet = false;
return nextKeyPair;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
private boolean setNextObject() {
while (iterator.hasNext()) {
String file = iterator.next();
nextKeyPair = doLoadKey(file);
if (nextKeyPair != null) {
nextKeyPairSet = true;
return true;
}
}
return false;
}
};
}
};
}
protected KeyPair doLoadKey(String file) {
try {
PEMParser r = new PEMParser(new InputStreamReader(new FileInputStream(file)));
try {
Object o = r.readObject();
JcaPEMKeyConverter pemConverter = new JcaPEMKeyConverter();
pemConverter.setProvider("BC");
if (passwordFinder != null && o instanceof PEMEncryptedKeyPair) {
JcePEMDecryptorProviderBuilder decryptorBuilder = new JcePEMDecryptorProviderBuilder();
PEMDecryptorProvider pemDecryptor = decryptorBuilder.build(passwordFinder.getPassword());
o = pemConverter.getKeyPair(((PEMEncryptedKeyPair) o).decryptKeyPair(pemDecryptor));
}
if (o instanceof PEMKeyPair) {
o = pemConverter.getKeyPair((PEMKeyPair)o);
return (KeyPair) o;
} else if (o instanceof KeyPair) {
return (KeyPair) o;
}
} finally {
r.close();
}
} catch (Exception e) {
log.warn("Unable to read key " + file, e);
}
return null;
}
}
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