public bool TryAcquireServerChallenge(WindowsAuthenticationToken message)
{
bool result = false;
SecurityBufferDesciption clientToken = new SecurityBufferDesciption(message.Data);
SecurityBufferDesciption serverToken = new SecurityBufferDesciption(MaximumTokenSize);
try
{
SecurityInteger lifetime = new SecurityInteger(0);
uint contextAttributes;
if (NativeMethods.AcquireCredentialsHandle(null, "NTLM", SecurityCredentialsInbound, IntPtr.Zero, IntPtr.Zero, 0, IntPtr.Zero, ref credentials, ref lifetime) == 0)
{
if (NativeMethods.AcceptSecurityContext(ref credentials, IntPtr.Zero, ref clientToken, StandardContextAttributes, SecurityNativeDataRepresentation, out context, out serverToken, out contextAttributes, out lifetime) == IntermediateResult)
{
result = true;
}
}
}
finally
{
message.Data = serverToken.GetBytes();
clientToken.Dispose();
serverToken.Dispose();
}
return result;
}
public bool IsClientResponseValid(WindowsAuthenticationToken token)
{
bool result = false;
SecurityBufferDesciption clientToken = new SecurityBufferDesciption(token.Data);
SecurityBufferDesciption serverToken = new SecurityBufferDesciption(MaximumTokenSize);
IntPtr securityContextHandle = IntPtr.Zero;
try
{
uint contextAttributes;
var lifetime = new SecurityInteger(0);
if (NativeMethods.AcceptSecurityContext(ref credentials, ref context, ref clientToken, StandardContextAttributes, SecurityNativeDataRepresentation, out context, out serverToken, out contextAttributes, out lifetime) == 0)
{
if (NativeMethods.QuerySecurityContextToken(ref context, ref securityContextHandle) == 0)
{
using (WindowsIdentity identity = new WindowsIdentity(securityContextHandle))
{
if (identity != null)
{
AuthenticatedUsername = identity.Name;
result = true;
}
}
}
}
}
finally
{
clientToken.Dispose();
serverToken.Dispose();
NativeMethods.CloseHandle(securityContextHandle);
credentials.Reset();
context.Reset();
}
return result;
}
public static extern int AcceptSecurityContext(ref SecurityHandle phCredential,
ref SecurityHandle phContext,
ref SecurityBufferDesciption pInput,
uint fContextReq,
uint TargetDataRep,
out SecurityHandle phNewContext,
out SecurityBufferDesciption pOutput,
out uint pfContextAttr,
out SecurityInteger ptsTimeStamp
);