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gssServer.java
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gssServer.java
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/* gssServer.java - Example GSS-API Java server */
/*
* Copyright (C) 2012 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Original source developed by wolfSSL (http://www.wolfssl.com)
*
* Description:
*
* A simple server application which uses the MIT Kerberos Java GSS-API.
* The following actions are taken by the server:
* a) Establish a GSS-API context with the example client.
* b) Unwrap a signed and encrypted message that the client sends.
* c) Generate and send a signature block for the received message.
*
* Before starting the example server, there should be an entry in your
* system keytab for the service principal.
*
* This class uses the utility class, GssUtil.java.
*
*/
import java.io.*;
import java.net.*;
import org.ietf.jgss.*;
public class gssServer {
private static int server_port = 11115;
private static String serviceName = "service@host";
private static GSSName name = null;
private static GSSCredential cred = null;
private static GSSManager mgr = GSSManager.getInstance();
public static void main(String args[]) {
try {
new gssServer().run(args);
} catch (Exception e) {
e.printStackTrace();
}
}
public void run(String args[]) throws Exception
{
/* pull in command line options from user */
for (int i = 0; i < args.length; i++)
{
String arg = args[i];
if (arg.equals("-?")) {
printUsage();
} else if (arg.equals("-p")) {
if (args.length < i+2)
printUsage();
server_port = Integer.parseInt(args[++i]);
} else if (arg.equals("-s")) {
if (args.length < i+2)
printUsage();
serviceName = args[++i];
} else {
printUsage();
}
}
System.out.println("Starting GSS-API Server Example");
/* set up a shutdown hook to release GSSCredential storage
when the user terminates the server with Ctrl+C */
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
try {
cred.dispose();
} catch (GSSException e) {
System.out.println("Couldn't free GSSCredential storage");
}
System.out.println("Freed GSSCredential storage");
}
});
ServerSocket serverSocket = null;
Socket clientSocket = null;
OutputStream clientOut = null;
InputStream clientIn = null;
/* create server socket */
try {
serverSocket = new ServerSocket(server_port);
} catch (IOException e) {
System.out.println("Error on port: " + server_port + ", " + e);
System.exit(1);
}
/* set up GSS-API name, credential */
name = mgr.createName(serviceName, GSSName.NT_HOSTBASED_SERVICE);
cred = mgr.createCredential(name, GSSCredential.INDEFINITE_LIFETIME,
(Oid) null, GSSCredential.ACCEPT_ONLY);
while(true)
{
byte[] inToken = null;
byte[] outToken = null;
byte[] buffer;
int err = 0;
GSSName peer;
MessageProp supplInfo = new MessageProp(true);
try {
System.out.println("\nwaiting for client connection"
+ "-----------------------------");
clientSocket = serverSocket.accept();
/* get input and output streams */
clientOut = clientSocket.getOutputStream();
clientIn = clientSocket.getInputStream();
System.out.println("client connection received from " +
clientSocket.getInetAddress().getHostAddress() +
" at port " + clientSocket.getLocalPort() + "\n");
/* establish context with client */
GSSContext context = mgr.createContext(cred);
while (!context.isEstablished()) {
inToken = GssUtil.ReadToken(clientIn);
System.out.println("Received token from client...");
System.out.println("Calling acceptSecContext");
outToken = context.acceptSecContext(inToken,
0, inToken.length);
if (outToken != null && outToken.length > 0) {
err = GssUtil.WriteToken(clientOut, outToken);
if (err == 0) {
System.out.println("Sent token to client...");
} else {
System.out.println("Error sending token to client");
}
}
}
GSSName peerName = context.getSrcName();
GSSName targetName = context.getTargName();
Oid mechName = context.getMech();
System.out.println("Security context established with " +
peerName.toString());
GssUtil.printSubString("Target Name", targetName.toString());
GssUtil.printSubString("Mechanism", mechName.toString());
GssUtil.printSubString("AnonymityState", context.getAnonymityState());
GssUtil.printSubString("ConfState", context.getConfState());
GssUtil.printSubString("CredDelegState", context.getCredDelegState());
GssUtil.printSubString("IntegState", context.getIntegState());
GssUtil.printSubString("Lifetime", context.getLifetime());
GssUtil.printSubString("MutualAuthState", context.getMutualAuthState());
GssUtil.printSubString("ReplayDetState", context.getReplayDetState());
GssUtil.printSubString("SequenceDetState", context.getSequenceDetState());
GssUtil.printSubString("Is initiator?", context.isInitiator());
GssUtil.printSubString("Is Prot Ready?", context.isProtReady());
/* read message sent by the client */
inToken = Util.ReadToken(clientIn);
System.out.println("Received token from client...");
/* unwrap the message */
buffer = context.unwrap(inToken, 0, inToken.length, supplInfo);
System.out.println("Message received from client ('" +
new String(buffer) + "')");
/* print other supplementary per-message status info */
System.out.println("Message from " +
peerName.toString() + " arrived.");
GssUtil.printSubString("Was it encrypted?", supplInfo.getPrivacy());
GssUtil.printSubString("Duplicate Token?", supplInfo.isDuplicateToken());
GssUtil.printSubString("Old Token?", supplInfo.isOldToken());
GssUtil.printSubString("Unsequenced Token?", supplInfo.isUnseqToken());
GssUtil.printSubString("Gap Token?", supplInfo.isGapToken());
supplInfo.setPrivacy(true); // privacy requested
supplInfo.setQOP(0); // default QOP
/* produce a signature block for the message */
buffer = context.getMIC(buffer, 0, buffer.length, supplInfo);
/* send signature block to client */
err = GssUtil.WriteToken(clientOut, buffer);
if (err == 0) {
System.out.println("Sent sig block to client...");
} else {
System.out.println("Error sending sig block to client...");
}
context.dispose();
} catch (IOException e) {
System.out.println("Server did not accept connection: " + e);
} catch (GSSException e) {
System.out.println("GSS-API Error: " + e.getMessage());
}
clientOut.close();
clientIn.close();
clientSocket.close();
}
}
public void printUsage() {
System.out.println("GSS-API example server usage:");
System.out.println("-?\t\tHelp, print this usage");
System.out.println("-p <port>\tPort to listen on, default 11115");
System.out.println("-s <str>\tService name, default 'service@host'");
System.exit(1);
}
}