private static string GssGetUser(
ref SafeGssContextHandle?context)
{
Interop.NetSecurityNative.GssBuffer token = default(Interop.NetSecurityNative.GssBuffer);
try
{
Interop.NetSecurityNative.Status status
= Interop.NetSecurityNative.GetUser(out var minorStatus,
context,
ref token);
if (status != Interop.NetSecurityNative.Status.GSS_S_COMPLETE)
{
throw new Interop.NetSecurityNative.GssApiException(status, minorStatus);
}
ReadOnlySpan <byte> tokenBytes = token.Span;
int length = tokenBytes.Length;
if (length > 0 && tokenBytes[length - 1] == '\0')
{
// Some GSS-API providers (gss-ntlmssp) include the terminating null with strings, so skip that.
tokenBytes = tokenBytes.Slice(0, length - 1);
}
#if NETSTANDARD2_0
return(Encoding.UTF8.GetString(tokenBytes.ToArray(), 0, tokenBytes.Length));
#else
return(Encoding.UTF8.GetString(tokenBytes));
#endif
}
finally
{
token.Dispose();
}
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (null != _context)
{
_context.Dispose();
_context = null;
}
if (_targetName != null)
{
_targetName.Dispose();
_targetName = null;
}
if (_acceptorCredential != null)
{
_acceptorCredential.Dispose();
_acceptorCredential = null;
}
}
base.Dispose(disposing);
}
private static bool GssInitSecurityContext(
ref SafeGssContextHandle?context,
SafeGssCredHandle credential,
bool isNtlm,
ChannelBinding?channelBinding,
SafeGssNameHandle?targetName,
Interop.NetSecurityNative.GssFlags inFlags,
byte[]?buffer,
out byte[]?outputBuffer,
out uint outFlags,
out bool isNtlmUsed)
{
outputBuffer = null;
outFlags = 0;
// 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.
bool newContext = false;
if (context == null)
{
newContext = true;
context = new SafeGssContextHandle();
}
Interop.NetSecurityNative.GssBuffer token = default(Interop.NetSecurityNative.GssBuffer);
Interop.NetSecurityNative.Status status;
try
{
Interop.NetSecurityNative.Status minorStatus;
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,
ref context,
isNtlm,
cbtAppData,
cbtAppDataSize,
targetName,
(uint)inFlags,
buffer,
(buffer == null) ? 0 : buffer.Length,
ref token,
out outFlags,
out isNtlmUsed);
}
else
{
status = Interop.NetSecurityNative.InitSecContext(out minorStatus,
credential,
ref context,
isNtlm,
targetName,
(uint)inFlags,
buffer,
(buffer == null) ? 0 : buffer.Length,
ref token,
out outFlags,
out isNtlmUsed);
}
if ((status != Interop.NetSecurityNative.Status.GSS_S_COMPLETE) &&
(status != Interop.NetSecurityNative.Status.GSS_S_CONTINUE_NEEDED))
{
if (newContext)
{
context.Dispose();
context = null;
}
throw new Interop.NetSecurityNative.GssApiException(status, minorStatus);
}
outputBuffer = token.ToByteArray();
}
finally
{
token.Dispose();
}
return(status == Interop.NetSecurityNative.Status.GSS_S_COMPLETE);
}
internal static SecurityStatusPal AcceptSecurityContext(
SafeFreeCredentials?credentialsHandle,
ref SafeDeleteContext?securityContext,
ContextFlagsPal requestedContextFlags,
byte[]?incomingBlob,
ChannelBinding?channelBinding,
ref byte[] resultBlob,
ref ContextFlagsPal contextFlags)
{
if (securityContext == null)
{
securityContext = new SafeDeleteNegoContext((SafeFreeNegoCredentials)credentialsHandle !);
}
SafeDeleteNegoContext negoContext = (SafeDeleteNegoContext)securityContext;
try
{
SafeGssContextHandle?contextHandle = negoContext.GssContext;
bool done = GssAcceptSecurityContext(
ref contextHandle,
negoContext.AcceptorCredential,
incomingBlob,
out resultBlob,
out uint outputFlags,
out bool isNtlmUsed);
Debug.Assert(resultBlob != null, "Unexpected null buffer returned by GssApi");
Debug.Assert(negoContext.GssContext == null || contextHandle == negoContext.GssContext);
// Save the inner context handle for further calls to NetSecurity
Debug.Assert(negoContext.GssContext == null || contextHandle == negoContext.GssContext);
if (null == negoContext.GssContext)
{
negoContext.SetGssContext(contextHandle !);
}
contextFlags = ContextFlagsAdapterPal.GetContextFlagsPalFromInterop(
(Interop.NetSecurityNative.GssFlags)outputFlags, isServer: true);
SecurityStatusPalErrorCode errorCode;
if (done)
{
if (NetEventSource.Log.IsEnabled())
{
string protocol = isNtlmUsed ? "SPNEGO-NTLM" : "SPNEGO-Kerberos";
NetEventSource.Info(securityContext, $"AcceptSecurityContext: actual protocol = {protocol}");
}
negoContext.SetAuthenticationPackage(isNtlmUsed);
errorCode = (isNtlmUsed && resultBlob.Length > 0) ? SecurityStatusPalErrorCode.OK : SecurityStatusPalErrorCode.CompleteNeeded;
}
else
{
errorCode = SecurityStatusPalErrorCode.ContinueNeeded;
}
return(new SecurityStatusPal(errorCode));
}
catch (Interop.NetSecurityNative.GssApiException gex)
{
if (NetEventSource.Log.IsEnabled())
{
NetEventSource.Error(null, gex);
}
return(new SecurityStatusPal(GetErrorCode(gex), gex));
}
catch (Exception ex)
{
if (NetEventSource.Log.IsEnabled())
{
NetEventSource.Error(null, ex);
}
return(new SecurityStatusPal(SecurityStatusPalErrorCode.InternalError, ex));
}
}
private static SecurityStatusPal EstablishSecurityContext(
SafeFreeNegoCredentials credential,
ref SafeDeleteContext?context,
ChannelBinding?channelBinding,
string?targetName,
ContextFlagsPal inFlags,
byte[]?incomingBlob,
ref byte[]?resultBuffer,
ref ContextFlagsPal outFlags)
{
bool isNtlmOnly = credential.IsNtlmOnly;
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 !);
}
SafeDeleteNegoContext negoContext = (SafeDeleteNegoContext)context;
try
{
Interop.NetSecurityNative.GssFlags inputFlags =
ContextFlagsAdapterPal.GetInteropFromContextFlagsPal(inFlags, isServer: false);
uint outputFlags;
bool isNtlmUsed;
SafeGssContextHandle?contextHandle = negoContext.GssContext;
bool done = GssInitSecurityContext(
ref contextHandle,
credential.GssCredential,
isNtlmOnly,
channelBinding,
negoContext.TargetName,
inputFlags,
incomingBlob,
out resultBuffer,
out outputFlags,
out isNtlmUsed);
if (done)
{
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);
Debug.Assert(negoContext.GssContext == null || contextHandle == negoContext.GssContext);
// Save the inner context handle for further calls to NetSecurity
Debug.Assert(negoContext.GssContext == null || contextHandle == negoContext.GssContext);
if (null == negoContext.GssContext)
{
negoContext.SetGssContext(contextHandle !);
}
SecurityStatusPalErrorCode errorCode = done ?
(negoContext.IsNtlmUsed && resultBuffer.Length > 0 ? SecurityStatusPalErrorCode.OK : SecurityStatusPalErrorCode.CompleteNeeded) :
SecurityStatusPalErrorCode.ContinueNeeded;
return(new SecurityStatusPal(errorCode));
}
catch (Exception ex)
{
if (NetEventSource.Log.IsEnabled())
{
NetEventSource.Error(null, ex);
}
return(new SecurityStatusPal(SecurityStatusPalErrorCode.InternalError, ex));
}
}
internal static partial Status GetUser(
out Status minorStatus,
SafeGssContextHandle?acceptContextHandle,
ref GssBuffer token);
public void SetGssContext(SafeGssContextHandle context)
{
Debug.Assert(context != null && !context.IsInvalid, "Invalid context passed to SafeDeleteNegoContext");
_context = context;
}
private static unsafe partial Status GetMic(
out Status minorStatus,
SafeGssContextHandle?contextHandle,
byte *inputBytes,
int inputLength,
ref GssBuffer outBuffer);