private static string GenerateKerberosAuthHeader(string host)
{
AuthenticationContext authenticationContext = null;
string result;
try
{
authenticationContext = new AuthenticationContext();
byte[] inputBuffer = null;
byte[] bytes = null;
string spn = CommandInvocation.spnPrefixForHttp + host;
authenticationContext.InitializeForOutboundNegotiate(AuthenticationMechanism.Kerberos, spn, null, null);
SecurityStatus securityStatus = authenticationContext.NegotiateSecurityContext(inputBuffer, out bytes);
if (securityStatus != SecurityStatus.OK && securityStatus != SecurityStatus.ContinueNeeded)
{
result = null;
}
else
{
string @string = Encoding.ASCII.GetString(bytes);
result = CommandInvocation.prefixForKerbAuthBlob + @string;
}
}
finally
{
if (authenticationContext != null)
{
authenticationContext.Dispose();
authenticationContext = null;
}
}
return(result);
}