private static SecurityStatusPalErrorCode GetErrorCode(Interop.NetSecurityNative.GssApiException exception)
{
switch (exception.MajorStatus)
{
case Interop.NetSecurityNative.Status.GSS_S_NO_CRED:
return(SecurityStatusPalErrorCode.UnknownCredentials);
case Interop.NetSecurityNative.Status.GSS_S_BAD_BINDINGS:
return(SecurityStatusPalErrorCode.BadBinding);
case Interop.NetSecurityNative.Status.GSS_S_CREDENTIALS_EXPIRED:
return(SecurityStatusPalErrorCode.CertExpired);
case Interop.NetSecurityNative.Status.GSS_S_DEFECTIVE_TOKEN:
return(SecurityStatusPalErrorCode.InvalidToken);
case Interop.NetSecurityNative.Status.GSS_S_DEFECTIVE_CREDENTIAL:
return(SecurityStatusPalErrorCode.IncompleteCredentials);
case Interop.NetSecurityNative.Status.GSS_S_BAD_SIG:
return(SecurityStatusPalErrorCode.MessageAltered);
case Interop.NetSecurityNative.Status.GSS_S_BAD_MECH:
return(SecurityStatusPalErrorCode.Unsupported);
case Interop.NetSecurityNative.Status.GSS_S_NO_CONTEXT:
default:
return(SecurityStatusPalErrorCode.InternalError);
}
}
private static SecurityStatusPal EstablishSecurityContext(
SafeFreeNegoCredentials credential,
ref SafeDeleteContext?context,
ChannelBinding?channelBinding,
string?targetName,
ContextFlagsPal inFlags,
ReadOnlySpan <byte> incomingBlob,
out byte[]?resultBuffer,
ref ContextFlagsPal outFlags)
{
bool isNtlmOnly = credential.IsNtlmOnly;
resultBuffer = null;
if (context == null)
{
if (NetEventSource.Log.IsEnabled())
{
string protocol = isNtlmOnly ? "NTLM" : "SPNEGO";
NetEventSource.Info(context, $"requested protocol = {protocol}, target = {targetName}");
}
context = new SafeDeleteNegoContext(credential, targetName !);
}
Interop.NetSecurityNative.GssBuffer token = default(Interop.NetSecurityNative.GssBuffer);
Interop.NetSecurityNative.Status status;
Interop.NetSecurityNative.Status minorStatus;
SafeDeleteNegoContext negoContext = (SafeDeleteNegoContext)context;
SafeGssContextHandle contextHandle = negoContext.GssContext;
try
{
Interop.NetSecurityNative.GssFlags inputFlags =
ContextFlagsAdapterPal.GetInteropFromContextFlagsPal(inFlags, isServer: false);
uint outputFlags;
bool isNtlmUsed;
if (channelBinding != null)
{
// If a TLS channel binding token (cbt) is available then get the pointer
// to the application specific data.
int appDataOffset = Marshal.SizeOf <SecChannelBindings>();
Debug.Assert(appDataOffset < channelBinding.Size);
IntPtr cbtAppData = channelBinding.DangerousGetHandle() + appDataOffset;
int cbtAppDataSize = channelBinding.Size - appDataOffset;
status = Interop.NetSecurityNative.InitSecContext(out minorStatus,
credential.GssCredential,
ref contextHandle,
isNtlmOnly,
cbtAppData,
cbtAppDataSize,
negoContext.TargetName,
(uint)inputFlags,
incomingBlob,
ref token,
out outputFlags,
out isNtlmUsed);
}
else
{
status = Interop.NetSecurityNative.InitSecContext(out minorStatus,
credential.GssCredential,
ref contextHandle,
isNtlmOnly,
negoContext.TargetName,
(uint)inputFlags,
incomingBlob,
ref token,
out outputFlags,
out isNtlmUsed);
}
if ((status != Interop.NetSecurityNative.Status.GSS_S_COMPLETE) &&
(status != Interop.NetSecurityNative.Status.GSS_S_CONTINUE_NEEDED))
{
if (negoContext.GssContext.IsInvalid)
{
context.Dispose();
}
Interop.NetSecurityNative.GssApiException gex = new Interop.NetSecurityNative.GssApiException(status, minorStatus);
if (NetEventSource.Log.IsEnabled())
{
NetEventSource.Error(null, gex);
}
resultBuffer = Array.Empty <byte>();
return(new SecurityStatusPal(GetErrorCode(gex), gex));
}
resultBuffer = token.ToByteArray();
if (status == Interop.NetSecurityNative.Status.GSS_S_COMPLETE)
{
if (NetEventSource.Log.IsEnabled())
{
string protocol = isNtlmOnly ? "NTLM" : isNtlmUsed ? "SPNEGO-NTLM" : "SPNEGO-Kerberos";
NetEventSource.Info(context, $"actual protocol = {protocol}");
}
// Populate protocol used for authentication
negoContext.SetAuthenticationPackage(isNtlmUsed);
}
Debug.Assert(resultBuffer != null, "Unexpected null buffer returned by GssApi");
outFlags = ContextFlagsAdapterPal.GetContextFlagsPalFromInterop(
(Interop.NetSecurityNative.GssFlags)outputFlags, isServer: false);
SecurityStatusPalErrorCode errorCode = status == Interop.NetSecurityNative.Status.GSS_S_COMPLETE ?
SecurityStatusPalErrorCode.OK :
SecurityStatusPalErrorCode.ContinueNeeded;
return(new SecurityStatusPal(errorCode));
}
catch (Exception ex)
{
if (NetEventSource.Log.IsEnabled())
{
NetEventSource.Error(null, ex);
}
return(new SecurityStatusPal(SecurityStatusPalErrorCode.InternalError, ex));
}
finally
{
token.Dispose();
// Save the inner context handle for further calls to NetSecurity
//
// For the first call `negoContext.GssContext` is invalid and we expect the
// inital handle to be returned from InitSecContext. For any subsequent
// call the handle should stay the same or it can be destroyed by the native
// InitSecContext call.
Debug.Assert(
negoContext.GssContext == contextHandle ||
negoContext.GssContext.IsInvalid ||
contextHandle.IsInvalid);
negoContext.SetGssContext(contextHandle);
}
}
internal static SecurityStatusPal AcceptSecurityContext(
SafeFreeCredentials?credentialsHandle,
ref SafeDeleteContext?securityContext,
ContextFlagsPal requestedContextFlags,
ReadOnlySpan <byte> incomingBlob,
ChannelBinding?channelBinding,
ref byte[] resultBlob,
out int resultBlobLength,
ref ContextFlagsPal contextFlags)
{
securityContext ??= new SafeDeleteNegoContext((SafeFreeNegoCredentials)credentialsHandle !);
SafeDeleteNegoContext negoContext = (SafeDeleteNegoContext)securityContext;
SafeGssContextHandle contextHandle = negoContext.GssContext;
Interop.NetSecurityNative.GssBuffer token = default(Interop.NetSecurityNative.GssBuffer);
try
{
Interop.NetSecurityNative.Status status;
Interop.NetSecurityNative.Status minorStatus;
status = Interop.NetSecurityNative.AcceptSecContext(out minorStatus,
negoContext.AcceptorCredential,
ref contextHandle,
incomingBlob,
ref token,
out uint outputFlags,
out bool isNtlmUsed);
if ((status != Interop.NetSecurityNative.Status.GSS_S_COMPLETE) &&
(status != Interop.NetSecurityNative.Status.GSS_S_CONTINUE_NEEDED))
{
if (negoContext.GssContext.IsInvalid)
{
contextHandle.Dispose();
}
Interop.NetSecurityNative.GssApiException gex = new Interop.NetSecurityNative.GssApiException(status, minorStatus);
if (NetEventSource.Log.IsEnabled())
{
NetEventSource.Error(null, gex);
}
resultBlobLength = 0;
return(new SecurityStatusPal(GetErrorCode(gex), gex));
}
resultBlob = token.ToByteArray();
Debug.Assert(resultBlob != null, "Unexpected null buffer returned by GssApi");
contextFlags = ContextFlagsAdapterPal.GetContextFlagsPalFromInterop(
(Interop.NetSecurityNative.GssFlags)outputFlags, isServer: true);
resultBlobLength = resultBlob.Length;
SecurityStatusPalErrorCode errorCode;
if (status == Interop.NetSecurityNative.Status.GSS_S_COMPLETE)
{
if (NetEventSource.Log.IsEnabled())
{
string protocol = isNtlmUsed ? "SPNEGO-NTLM" : "SPNEGO-Kerberos";
NetEventSource.Info(securityContext, $"AcceptSecurityContext: actual protocol = {protocol}");
}
negoContext.SetAuthenticationPackage(isNtlmUsed);
errorCode = SecurityStatusPalErrorCode.OK;
}
else
{
errorCode = SecurityStatusPalErrorCode.ContinueNeeded;
}
return(new SecurityStatusPal(errorCode));
}
catch (Exception ex)
{
if (NetEventSource.Log.IsEnabled())
{
NetEventSource.Error(null, ex);
}
resultBlobLength = 0;
return(new SecurityStatusPal(SecurityStatusPalErrorCode.InternalError, ex));
}
finally
{
token.Dispose();
// Save the inner context handle for further calls to NetSecurity
//
// For the first call `negoContext.GssContext` is invalid and we expect the
// inital handle to be returned from AcceptSecContext. For any subsequent
// call the handle should stay the same or it can be destroyed by the native
// AcceptSecContext call.
Debug.Assert(
negoContext.GssContext == contextHandle ||
negoContext.GssContext.IsInvalid ||
contextHandle.IsInvalid);
negoContext.SetGssContext(contextHandle);
}
}
public void WriteHandshakeFrame(Interop.NetSecurityNative.GssApiException e)
{
WriteFrameHeader(ErrorBuffer.Length, isError: true);
_innerStream.Write(ErrorBuffer, 0, ErrorBuffer.Length);
}
