/*
*
* 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 org.apache.airavata.credential.store.credential.impl.ssh;
import java.io.File;
import java.io.IOException;
import org.apache.airavata.credential.store.store.CredentialStoreException;
import org.apache.airavata.credential.store.store.impl.SSHCredentialWriter;
import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.RandomStringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.KeyPair;
/**
* A class which generates an SSH credential
*/
public class SSHCredentialGenerator {
private static Logger logger = LoggerFactory.getLogger(SSHCredentialWriter.class);
/**
*
* @return a SSH Credential generated and encrypted using a randomly generated password
* @throws CredentialStoreException
*/
public SSHCredential generateCredential(String tokenId) throws CredentialStoreException {
JSch jsch=new JSch();
try {
KeyPair kpair=KeyPair.genKeyPair(jsch, KeyPair.RSA);
File file;
file = File.createTempFile("id_rsa", "");
String fileName = file.getAbsolutePath();
String password = generateRandomString();
// We are encrypting the private key with the hash of (tokenId+password).
// Any client which wants to use this private key will also generate a hash and then use it to decrypt the key.
kpair.writePrivateKey(fileName,generateHash(tokenId,password).getBytes());
kpair.writePublicKey(fileName + ".pub" , "");
kpair.dispose();
byte[] priKey = FileUtils.readFileToByteArray(new File(fileName));
byte[] pubKey = FileUtils.readFileToByteArray(new File(fileName + ".pub"));
SSHCredential sshCredential = new SSHCredential();
sshCredential.setPrivateKey(priKey);
sshCredential.setPublicKey(pubKey);
sshCredential.setPassphrase(password);
return sshCredential;
} catch (IOException e) {
logger.error("IO Exception when creating SSH credential ",e);
throw new CredentialStoreException("Unable to generate SSH Credential", e);
} catch (JSchException e) {
logger.error("JSch SSH credential creation exception ",e);
throw new CredentialStoreException("Unable to generate SSH Credential. JSch exception ", e);
}
}
private String generateHash(String tokenId, String password) {
// TODO: Hash the password generated and return it
return null;
}
// Generate a random alphanumberic string of 16 characters length
private String generateRandomString() {
return RandomStringUtils.randomAlphanumeric(16);
}
}