draft-morris-java-gssapi-update-for-csharp-00.txt [plain text]
GSSAPI Java CSharp C. Morris
INTERNET-DRAFT Novell, Inc.
draft-morris-java-gssapi-update-for-csharp-00.txt comorris@novell.com
Expires 10 March 2004 July 2004
Generic Security Service API Version 2 : Java & C# Bindings
Status of this Memo
Comments should be submitted to comorris@novell.com.
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Abstract
The Generic Security Services Application Program Interface (GSS-API)
offers application programmers uniform access to security services
atop a variety of underlying cryptographic mechanisms. This document
proposes an update to RFC 2853, Generic Security Service API Version
2 : Java Bindings, to include C# bindings.
4.17. C# Modifications
This section describes the language dependent modifications necessary
to implement the interface in C#.
4.17.1 C# Assembly Name
The C# namespace is org.ietf.gss. See section 4.17.5 for an example.
4.17.2 C# Class Definitions
All class definitions & methods remain the same as specified in the
Java bindings.
4.17.3 C# Data Types
All data types remain the same.
4.17.4 C# Exception Handling
All exception codes remain the same as specified in the Java bindings.
However, C# does not have a 'throws' statement. Therefore, method prototypes do
not include the exception type. For example,
Java method prototype :
public abstract GSSName createName(String nameStr, Oid nameType)
throws GSSException;
Equivalent C# method prototype :
public abstract GSSName createName(String nameStr, Oid nameType);
C# does implement the throw and catch keywords, for example:
public class GSSName createName(String nameStr, Oid nameType)
{
int majorCode = 0;
...
majorCode = validateParms(nameStr, nameType);
if (majorCode)
throw new GSSException(majorCode);
...
}
4.17.5 C# Example Code
Client example :
using ietf.org.gss;
class GssapiClient
{
private static TcpClient client;
private static NetworkStream stream;
static void Main(string[] args)
{
Connect("127.0.0.1", "message from client");
try
{
GSSManager manager = GSSManager.getInstance();
Oid krb5Mechanism = new Oid("1.2.840.113554.1.2.2");
Oid krb5PrincipalNameType = new Oid("1.2.840.113554.1.2.2.1");
// Optionally Identify who the client wishes to be
// GSSName name = manager.createName("test@gsserver", GSSName.NT_USER_NAME);
// Obtain default credential
GSSCredential userCreds = manager.createCredential(GSSCredential.INITIATE_ONLY);
GSSName name = userCreds.getName(krb5PrincipalNameType);
Console.WriteLine("Just acquired credentials for " + name.toString());
int acceptLife = userCreds.getRemainingAcceptLifetime(new Oid("2.3.4"));
int initLife = userCreds.getRemainingInitLifetime(new Oid("1..3."));
int remLife = userCreds.getRemainingLifetime();
int usage = userCreds.getUsage();
GSSName namea = userCreds.getName();
Oid[] oa = userCreds.getMechs();
// Instantiate and initialize a security context that will be
// established with the server
GSSContext context = manager.createContext(name,
krb5Mechanism,
userCreds,
GSSContext.DEFAULT_LIFETIME);
userCreds.dispose();
// Optionally Set Context Options, must be done before iniSecContext call
context.requestMutualAuth(true);
context.requestConf(true);
context.requestInteg(true);
context.requestSequenceDet(true);
context.requestCredDeleg(true);
MemoryStream ins = new MemoryStream();
MemoryStream outs = new MemoryStream();
// loop until context is setup and no more tokens to receive
while (!context.isEstablished())
{
outs = new MemoryStream();
context.initSecContext(ins, outs);
// send token if present
if (outs.Length > 0)
{
Console.WriteLine("Sending token...");
sendToken(outs);
}
// check if we should expect more tokens
if (context.isEstablished())
break;
// another token expected from peer
Console.WriteLine("Still expecting another token from server...");
ins = recvToken();
}
//
// display context information
//
// Did the server authenticate back to client?
Console.WriteLine("\n{0} Mutual Authentication",
context.getMutualAuthState() ? "Using" : "Not using");
Console.WriteLine("Credentials were delegated = "
+ context.getCredDelegState());
Console.WriteLine("Remaining lifetime in seconds = "
+ context.getLifetime());
Console.WriteLine("Context mechanism = " + context.getMech());
Console.WriteLine("Initiator = " + context.getSrcName().toString());
Console.WriteLine("Acceptor = " + context.getTargName().toString());
Console.WriteLine("Confidentiality (i.e., privacy) is {0}available",
context.getConfState() ? "" : "not ");
Console.WriteLine("Integrity is {0}available",
context.getIntegState() ? "" : "not ");
Console.WriteLine("Is initiator = " + context.isInitiator());
Console.WriteLine("Is transferable = " + context.isTransferable());
Console.WriteLine("Is protReady = " + context.isProtReady());
Console.WriteLine("ReplayDetState = " +
context.getReplayDetState());
Console.WriteLine("SequenceDetState = " +
context.getSequenceDetState());
// perform wrap on an application supplied message
// using QOP = 0, and requesting privacy service
MessageProp msgProp = new MessageProp(0, true);
byte [] message = System.Text.Encoding.ASCII.GetBytes("Hello GSS-API!");
byte [] token = System.Text.Encoding.ASCII.GetBytes("tok");
// Byte aray method is equivalent to stream method
//byte []token = context.wrap(message, 0, appMsg.length, msgProp);
//sendToken(token);
ins = new MemoryStream();
outs = new MemoryStream();
ins.Write(token, 0, token.Length);
context.getMIC(ins, outs, msgProp);
sendToken(outs);
outs = new MemoryStream();
outs.Write(message, 0, message.Length);
sendToken(outs);
ins = new MemoryStream();
outs = new MemoryStream();
ins.Write(message, 0, message.Length);
context.wrap(ins, outs, msgProp);
sendToken(outs);
// Optionally export context to another thead
GSSContext ctx = manager.createContext(context.export());
Console.WriteLine("New context isTransferable = " + ctx.isTransferable());
Console.WriteLine("New context isInitiator = " +ctx.isInitiator());
Console.WriteLine("New context protReady = " +ctx.isProtReady());
Console.WriteLine("New context srcName = " +ctx.getSrcName().toString());
Console.WriteLine("New context targName = " +ctx.getTargName().toString());
// release the local-end of the context
ctx.dispose();
stream.Close();
Console.WriteLine("Leaving...");
}
catch (GSSException e)
{
Console.WriteLine(e.getMessage());
Console.WriteLine(e.StackTrace);
}
}
Expires 10 March 2004