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using System;
using System.Diagnostics;
using System.IO;
using System.Security.Authentication;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Win32.SafeHandles;
namespace System.Net.Security.Tests
{
internal class UnixGssFakeNegotiateStream : NegotiateStream
{
private static Action<object> s_serverLoop = ServerLoop;
private static Action<object> s_msgLoop = MessageLoop;
private readonly UnixGssFakeStreamFramer _framer;
private SafeGssContextHandle _context;
private volatile int _dataMsgCount;
public UnixGssFakeNegotiateStream(Stream innerStream) : base(innerStream)
{
_framer = new UnixGssFakeStreamFramer(innerStream);
_dataMsgCount = 0;
}
public override Task AuthenticateAsServerAsync()
{
return Task.Factory.StartNew(s_serverLoop, this, CancellationToken.None, TaskCreationOptions.None, TaskScheduler.Default);
}
public Task PollMessageAsync(int count)
{
_dataMsgCount = count;
return Task.Factory.StartNew(s_msgLoop, this, CancellationToken.None, TaskCreationOptions.None, TaskScheduler.Default);
}
public static void GetDefaultKerberosCredentials(string username, string password)
{
// Fetch a Kerberos TGT which gets saved in the default cache
SafeGssCredHandle.Create(username, password, isNtlmOnly:false).Dispose();
}
private static void ServerLoop(object state)
{
UnixGssFakeNegotiateStream thisRef = (UnixGssFakeNegotiateStream)state;
var header = new byte[5];
bool handshakeDone = false;
do
{
byte[] inBuf = thisRef._framer.ReadHandshakeFrame();
byte[] outBuf = null;
try
{
handshakeDone = EstablishSecurityContext(ref thisRef._context, inBuf, out outBuf);
thisRef._framer.WriteHandshakeFrame(outBuf, 0, outBuf.Length);
}
catch (Interop.NetSecurityNative.GssApiException e)
{
thisRef._framer.WriteHandshakeFrame(e);
handshakeDone = true;
}
}
while (!handshakeDone);
}
private static void MessageLoop(object state)
{
UnixGssFakeNegotiateStream thisRef = (UnixGssFakeNegotiateStream)state;
while (thisRef._dataMsgCount > 0)
{
byte[] inBuf = thisRef._framer.ReadDataFrame();
byte[] unwrapped = UnwrapMessage(thisRef._context, inBuf);
byte[] outMsg = WrapMessage(thisRef._context, unwrapped);
thisRef._framer.WriteDataFrame(outMsg, 0, outMsg.Length);
thisRef._dataMsgCount--;
}
}
private static bool EstablishSecurityContext(
ref SafeGssContextHandle context,
byte[] buffer,
out byte[] outputBuffer)
{
outputBuffer = null;
// EstablishSecurityContext is called multiple times in a session.
// In each call, we need to pass the context handle from the previous call.
// For the first call, the context handle will be null.
if (context == null)
{
context = new SafeGssContextHandle();
}
Interop.NetSecurityNative.GssBuffer token = default(Interop.NetSecurityNative.GssBuffer);
Interop.NetSecurityNative.Status status;
try
{
Interop.NetSecurityNative.Status minorStatus;
status = Interop.NetSecurityNative.AcceptSecContext(out minorStatus,
ref context,
buffer,
(buffer == null) ? 0 : buffer.Length,
ref token);
if ((status != Interop.NetSecurityNative.Status.GSS_S_COMPLETE) && (status != Interop.NetSecurityNative.Status.GSS_S_CONTINUE_NEEDED))
{
throw new Interop.NetSecurityNative.GssApiException(status, minorStatus);
}
outputBuffer = token.ToByteArray();
}
finally
{
token.Dispose();
}
return status == Interop.NetSecurityNative.Status.GSS_S_COMPLETE;
}
private static byte[] UnwrapMessage(SafeGssContextHandle context, byte[] message)
{
Interop.NetSecurityNative.GssBuffer unwrapped = default(Interop.NetSecurityNative.GssBuffer);
Interop.NetSecurityNative.Status status;
try
{
Interop.NetSecurityNative.Status minorStatus;
status = Interop.NetSecurityNative.UnwrapBuffer(out minorStatus,
context, message, 0, message.Length, ref unwrapped);
if (status != Interop.NetSecurityNative.Status.GSS_S_COMPLETE)
{
throw new Interop.NetSecurityNative.GssApiException(status, minorStatus);
}
return unwrapped.ToByteArray();
}
finally
{
unwrapped.Dispose();
}
}
private static byte[] WrapMessage(SafeGssContextHandle context, byte[] message)
{
Interop.NetSecurityNative.GssBuffer wrapped = default(Interop.NetSecurityNative.GssBuffer);
Interop.NetSecurityNative.Status status;
try
{
Interop.NetSecurityNative.Status minorStatus;
status = Interop.NetSecurityNative.WrapBuffer(out minorStatus,
context, false, message, 0, message.Length, ref wrapped);
if (status != Interop.NetSecurityNative.Status.GSS_S_COMPLETE)
{
throw new Interop.NetSecurityNative.GssApiException(status, minorStatus);
}
return wrapped.ToByteArray();
}
finally
{
wrapped.Dispose();
}
}
}
}
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