/// <summary>
/// Try to acquire the server challenge for this state
/// </summary>
/// <param name="message"></param>
/// <returns></returns>
public bool TryAcquireServerChallenge(ref byte[] message)
{
SecurityBufferDesciption clientToken = new SecurityBufferDesciption(message);
SecurityBufferDesciption serverToken = new SecurityBufferDesciption(Common.MaximumTokenSize);
try
{
int result;
var lifetime = new SecurityInteger(0);
result = Interop.AcquireCredentialsHandle(
null,
"NTLM",
Common.SecurityCredentialsInbound,
IntPtr.Zero,
IntPtr.Zero,
0,
IntPtr.Zero,
ref this.Credentials,
ref lifetime);
if (result != Common.SuccessfulResult)
{
// Credentials acquire operation failed.
return(false);
}
uint contextAttributes;
result = Interop.AcceptSecurityContext(
ref this.Credentials, // [in] handle to the credentials
IntPtr.Zero, // [in/out] handle of partially formed context. Always NULL the first time through
ref clientToken, // [in] pointer to the input buffers
Common.StandardContextAttributes, // [in] required context attributes
Common.SecurityNativeDataRepresentation, // [in] data representation on the target
out this.Context, // [in/out] receives the new context handle
out serverToken, // [in/out] pointer to the output buffers
out contextAttributes, // [out] receives the context attributes
out lifetime); // [out] receives the life span of the security context
if (result != Common.IntermediateResult)
{
// Client challenge issue operation failed.
return(false);
}
}
finally
{
message = serverToken.GetBytes();
clientToken.Dispose();
serverToken.Dispose();
}
return(true);
}
/// <summary>
/// Validate the client response and fill the indentity of the token
/// </summary>
/// <param name="message"></param>
/// <returns></returns>
public bool IsClientResponseValid(byte[] message)
{
SecurityBufferDesciption clientToken = new SecurityBufferDesciption(message);
SecurityBufferDesciption serverToken = new SecurityBufferDesciption(Common.MaximumTokenSize);
IntPtr securityContextHandle = IntPtr.Zero;
try
{
int result;
uint contextAttributes;
var lifetime = new SecurityInteger(0);
result = Interop.AcceptSecurityContext(
ref this.Credentials, // [in] handle to the credentials
ref this.Context, // [in/out] handle of partially formed context. Always NULL the first time through
ref clientToken, // [in] pointer to the input buffers
Common.StandardContextAttributes, // [in] required context attributes
Common.SecurityNativeDataRepresentation, // [in] data representation on the target
out this.Context, // [in/out] receives the new context handle
out serverToken, // [in/out] pointer to the output buffers
out contextAttributes, // [out] receives the context attributes
out lifetime); // [out] receives the life span of the security context
if (result != Common.SuccessfulResult)
{
return(false);
}
if (Interop.QuerySecurityContextToken(ref this.Context, ref securityContextHandle) != 0)
{
return(false);
}
var identity = new WindowsIdentity(securityContextHandle);
if (identity == null)
{
return(false);
}
this.WindowsIdentity = identity;
}
finally
{
clientToken.Dispose();
serverToken.Dispose();
Interop.CloseHandle(securityContextHandle);
this.Credentials.Reset();
this.Context.Reset();
}
return(true);
}
