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GSSAPI Java CSharp C. Morris
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INTERNET-DRAFT Novell, Inc.
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draft-morris-java-gssapi-update-for-csharp-00.txt comorris@novell.com
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Expires 10 March 2004 July 2004
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Generic Security Service API Version 2 : Java & C# Bindings
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Comments should be submitted to comorris@novell.com.
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By submitting this Internet-Draft, I certify that any applicable
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patent or other IPR claims of which I am aware have been disclosed, or
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will be disclosed, and any of which I become aware will be disclosed,
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in accordance with RFC 3668.
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Internet-Drafts are working documents of the Internet Engineering
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Task Force (IETF), its areas, and its working groups. Note that other
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groups may also distribute working documents as Internet-Drafts.
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Internet-Drafts are draft documents valid for a maximum of six months
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and may be updated, replaced, or obsoleted by other documents at any
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time. It is inappropriate to use Internet-Drafts as reference
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material or to cite them other than a "work in progress."
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The list of current Internet-Drafts can be accessed at
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http://www.ietf.org/1id-abstracts.html
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The list of Internet-Draft Shadow Directories can be accessed at
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http://www.ietf.org/shadow.html
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The Generic Security Services Application Program Interface (GSS-API)
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offers application programmers uniform access to security services
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atop a variety of underlying cryptographic mechanisms. This document
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proposes an update to RFC 2853, Generic Security Service API Version
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2 : Java Bindings, to include C# bindings.
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4.17. C# Modifications
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This section describes the language dependent modifications necessary
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to implement the interface in C#.
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4.17.1 C# Assembly Name
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The C# namespace is org.ietf.gss. See section 4.17.5 for an example.
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4.17.2 C# Class Definitions
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All class definitions & methods remain the same as specified in the
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All data types remain the same.
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4.17.4 C# Exception Handling
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All exception codes remain the same as specified in the Java bindings.
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However, C# does not have a 'throws' statement. Therefore, method prototypes do
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not include the exception type. For example,
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Java method prototype :
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public abstract GSSName createName(String nameStr, Oid nameType)
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Equivalent C# method prototype :
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public abstract GSSName createName(String nameStr, Oid nameType);
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C# does implement the throw and catch keywords, for example:
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public class GSSName createName(String nameStr, Oid nameType)
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majorCode = validateParms(nameStr, nameType);
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throw new GSSException(majorCode);
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4.17.5 C# Example Code
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private static TcpClient client;
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private static NetworkStream stream;
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static void Main(string[] args)
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Connect("127.0.0.1", "message from client");
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GSSManager manager = GSSManager.getInstance();
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Oid krb5Mechanism = new Oid("1.2.840.113554.1.2.2");
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Oid krb5PrincipalNameType = new Oid("1.2.840.113554.1.2.2.1");
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// Optionally Identify who the client wishes to be
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// GSSName name = manager.createName("test@gsserver", GSSName.NT_USER_NAME);
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// Obtain default credential
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GSSCredential userCreds = manager.createCredential(GSSCredential.INITIATE_ONLY);
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GSSName name = userCreds.getName(krb5PrincipalNameType);
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Console.WriteLine("Just acquired credentials for " + name.toString());
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int acceptLife = userCreds.getRemainingAcceptLifetime(new Oid("2.3.4"));
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int initLife = userCreds.getRemainingInitLifetime(new Oid("1..3."));
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int remLife = userCreds.getRemainingLifetime();
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int usage = userCreds.getUsage();
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GSSName namea = userCreds.getName();
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Oid[] oa = userCreds.getMechs();
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// Instantiate and initialize a security context that will be
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// established with the server
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GSSContext context = manager.createContext(name,
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GSSContext.DEFAULT_LIFETIME);
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// Optionally Set Context Options, must be done before iniSecContext call
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context.requestMutualAuth(true);
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context.requestConf(true);
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context.requestInteg(true);
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context.requestSequenceDet(true);
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context.requestCredDeleg(true);
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MemoryStream ins = new MemoryStream();
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MemoryStream outs = new MemoryStream();
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// loop until context is setup and no more tokens to receive
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while (!context.isEstablished())
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outs = new MemoryStream();
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context.initSecContext(ins, outs);
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// send token if present
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Console.WriteLine("Sending token...");
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// check if we should expect more tokens
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if (context.isEstablished())
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// another token expected from peer
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Console.WriteLine("Still expecting another token from server...");
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// display context information
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// Did the server authenticate back to client?
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Console.WriteLine("\n{0} Mutual Authentication",
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context.getMutualAuthState() ? "Using" : "Not using");
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Console.WriteLine("Credentials were delegated = "
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+ context.getCredDelegState());
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Console.WriteLine("Remaining lifetime in seconds = "
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+ context.getLifetime());
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Console.WriteLine("Context mechanism = " + context.getMech());
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Console.WriteLine("Initiator = " + context.getSrcName().toString());
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Console.WriteLine("Acceptor = " + context.getTargName().toString());
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Console.WriteLine("Confidentiality (i.e., privacy) is {0}available",
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context.getConfState() ? "" : "not ");
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Console.WriteLine("Integrity is {0}available",
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context.getIntegState() ? "" : "not ");
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Console.WriteLine("Is initiator = " + context.isInitiator());
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Console.WriteLine("Is transferable = " + context.isTransferable());
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Console.WriteLine("Is protReady = " + context.isProtReady());
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Console.WriteLine("ReplayDetState = " +
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context.getReplayDetState());
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Console.WriteLine("SequenceDetState = " +
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context.getSequenceDetState());
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// perform wrap on an application supplied message
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// using QOP = 0, and requesting privacy service
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MessageProp msgProp = new MessageProp(0, true);
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byte [] message = System.Text.Encoding.ASCII.GetBytes("Hello GSS-API!");
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byte [] token = System.Text.Encoding.ASCII.GetBytes("tok");
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// Byte aray method is equivalent to stream method
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//byte []token = context.wrap(message, 0, appMsg.length, msgProp);
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ins = new MemoryStream();
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outs = new MemoryStream();
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ins.Write(token, 0, token.Length);
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context.getMIC(ins, outs, msgProp);
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outs = new MemoryStream();
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outs.Write(message, 0, message.Length);
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ins = new MemoryStream();
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outs = new MemoryStream();
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ins.Write(message, 0, message.Length);
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context.wrap(ins, outs, msgProp);
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// Optionally export context to another thead
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GSSContext ctx = manager.createContext(context.export());
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Console.WriteLine("New context isTransferable = " + ctx.isTransferable());
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Console.WriteLine("New context isInitiator = " +ctx.isInitiator());
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Console.WriteLine("New context protReady = " +ctx.isProtReady());
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Console.WriteLine("New context srcName = " +ctx.getSrcName().toString());
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Console.WriteLine("New context targName = " +ctx.getTargName().toString());
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// release the local-end of the context
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Console.WriteLine("Leaving...");
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catch (GSSException e)
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Console.WriteLine(e.getMessage());
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Console.WriteLine(e.StackTrace);
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Expires 10 March 2004
added
removed
doc/standardisation/draft-morris-java-gssapi-update-for-csharp-00.txt
