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karandbansal/NetSec<|file_sep|>/SourceCode/Java/src/main/java/com/karan/netsec/common/KeyGenerator.java package com.karan.netsec.common; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.NoSuchAlgorithmException; /** * Created by karan on 16/06/16. */ public class KeyGenerator { public static KeyPair generateRSAKeyPair() throws NoSuchAlgorithmException { KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA"); keyGen.initialize(2048); return keyGen.genKeyPair(); } } <|repo_name|>karandbansal/NetSec<|file_sep|>/SourceCode/Java/src/main/java/com/karan/netsec/common/MailClient.java package com.karan.netsec.common; import javax.mail.*; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import java.io.IOException; import java.util.Properties; /** * Created by karan on 14/06/16. */ public class MailClient { public static void sendMail(String toEmailId, String fromEmailId, String host, String subject, String body) throws MessagingException { // Set properties Properties properties = new Properties(); properties.put("mail.smtp.host", host); Session session = Session.getDefaultInstance(properties); // Create message Message message = new MimeMessage(session); message.setFrom(new InternetAddress(fromEmailId)); message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toEmailId)); message.setSubject(subject); message.setText(body); // Send message Transport.send(message); } public static void sendMail(String toEmailId, String fromEmailId, String host, String subject, String body, String attachmentPath) throws MessagingException { // Set properties Properties properties = new Properties(); properties.put("mail.smtp.host", host); Session session = Session.getDefaultInstance(properties); // Create message Message message = new MimeMessage(session); message.setFrom(new InternetAddress(fromEmailId)); message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toEmailId)); message.setSubject(subject); // Create the message part MimeBodyPart messageBodyPart = new MimeBodyPart(); // Fill the message // messageBodyPart.setText(body); // Create a multipart message for attachment Multipart multipart = new MimeMultipart(); // Set text message part // multipart.addBodyPart(messageBodyPart); // Second part is attachment messageBodyPart = new MimeBodyPart(); // try { // DataSource source = new FileDataSource(attachmentPath); // messageBodyPart.setDataHandler(new DataHandler(source)); // messageBodyPart.setFileName(attachmentPath); // } catch (MessagingException | IOException e) { // e.printStackTrace(); // } // multipart.addBodyPart(messageBodyPart); // Send the complete message parts // message.setContent(multipart); // Send email Transport.send(message); } } <|file_sep|># NetSec ### Requirements 1) Java8 or higher 2) Maven ### To Build 1) Open Terminal at root folder of project and run `mvn clean install` 2) Go to `target` directory and you can find jar file there with name `NetSec.jar` ### To Run 1) Open Terminal at root folder of project and run `java -jar target/NetSec.jar` 2) Open another Terminal at same location and run `java -jar target/NetSec.jar` <|repo_name|>karandbansal/NetSec<|file_sep|>/SourceCode/Java/src/main/java/com/karan/netsec/server/Authenticator.java package com.karan.netsec.server; import com.karan.netsec.common.KeyGenerator; import com.karan.netsec.common.MailClient; import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec; import java.io.*; import java.math.BigInteger; import java.security.*; import java.security.spec.RSAPrivateKeySpec; import java.security.spec.RSAPublicKeySpec; import java.util.ArrayList; import java.util.List; /** * Created by karan on 16/06/16. */ public class Authenticator implements Runnable { private static final String RSA_ALGORITHM = "RSA"; private static final String AES_ALGORITHM = "AES"; private static final String DES_ALGORITHM = "DES"; private Server server; public Authenticator(Server server) { this.server = server; } @Override public void run() { try { authenticateClient(); System.out.println("Client authenticated successfully"); server.startDataCommunication(); System.out.println("Data communication started"); server.startHeartBeatCommunication(); System.out.println("Heart beat communication started"); server.startWatchDogThread(); System.out.println("Watch dog thread started"); System.out.println("Server is now waiting for client request..."); while (true) { if (!server.getIsClientAlive()) { break; } if (!server.getIsClientRequestReceived()) { continue; } if (server.getClientRequest().equals("upload")) { handleUploadRequest(); break; } else if (server.getClientRequest().equals("download")) { handleDownloadRequest(); break; } else if (server.getClientRequest().equals("exit")) { handleExitRequest(); break; } } System.out.println("Client exited"); server.stopHeartBeatCommunication(); System.out.println("Heart beat communication stopped"); server.stopDataCommunication(); System.out.println("Data communication stopped"); server.stopWatchDogThread(); System.out.println("Watch dog thread stopped"); server.closeAllConnections(); System.out.println("All connections closed"); Server.main(null); System.exit(0); } catch (IOException | ClassNotFoundException | NoSuchAlgorithmException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException | NoSuchPaddingException | InvalidKeySpecException e) { e.printStackTrace(); try { Server.main(null); System.exit(0); } catch (Exception ex) { ex.printStackTrace(); System.exit(-1); } } } private void authenticateClient() throws IOException, ClassNotFoundException, NoSuchAlgorithmException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException, InvalidKeySpecException { // Generate RSA key pair for client authentication and encryption of AES key for data communication KeyPair rsaKeyPairForAuthentication = KeyGenerator.generateRSAKeyPair(); // Generate AES key for data communication SecretKey aesSecretKeyForDataCommunication = KeyGenerator.generateAESKey(); // Encrypt AES key with RSA public key Cipher cipherForDataCommunication = Cipher.getInstance(RSA_ALGORITHM); cipherForDataCommunication.init(Cipher.ENCRYPT_MODE, rsaKeyPairForAuthentication.getPublic()); // Read client's public key from file FileInputStream inputStream = new FileInputStream(server.getClientPublicKeyFilePath()); // Decrypt RSA encrypted AES key using client's public key byte[] aesSecretKeyEncryptedBytes = cipherForDataCommunication.doFinal(aesSecretKeyForDataCommunication.getEncoded()); // Write AES encrypted bytes to file and send file name to client FileOutputStream outputStream = new FileOutputStream(server.getTempDirectoryPath() + File.separator + "aes_key.txt"); // Write RSA encrypted AES key bytes to file