public static SecurityStatusPal AcceptSecurityContext(ref SafeFreeCredentials?credentialsHandle, ref SafeDeleteSslContext?context, ReadOnlySpan <byte> inputBuffer, ref byte[]?outputBuffer, SslAuthenticationOptions sslAuthenticationOptions)
{
Interop.SspiCli.ContextFlags unusedAttributes = default;
InputSecurityBuffers inputBuffers = default;
inputBuffers.SetNextBuffer(new InputSecurityBuffer(inputBuffer, SecurityBufferType.SECBUFFER_TOKEN));
inputBuffers.SetNextBuffer(new InputSecurityBuffer(default, SecurityBufferType.SECBUFFER_EMPTY));
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)
{
InputSecurityBuffers inputBuffers = default;
if (!incomingBlob.IsEmpty)
{
inputBuffers.SetNextBuffer(new InputSecurityBuffer(incomingBlob, SecurityBufferType.SECBUFFER_TOKEN));
}
if (channelBinding != null)
{
inputBuffers.SetNextBuffer(new InputSecurityBuffer(channelBinding));
}
var outSecurityBuffer = new SecurityBuffer(resultBlob, SecurityBufferType.SECBUFFER_TOKEN);
Interop.SspiCli.ContextFlags outContextFlags = Interop.SspiCli.ContextFlags.Zero;
// There is only one SafeDeleteContext type on Windows which is SafeDeleteSslContext so this cast is safe.
SafeDeleteSslContext?sslContext = (SafeDeleteSslContext?)securityContext;
Interop.SECURITY_STATUS winStatus = (Interop.SECURITY_STATUS)SSPIWrapper.AcceptSecurityContext(
GlobalSSPI.SSPIAuth,
credentialsHandle,
ref sslContext,
ContextFlagsAdapterPal.GetInteropFromContextFlagsPal(requestedContextFlags),
Interop.SspiCli.Endianness.SECURITY_NETWORK_DREP,
inputBuffers,
ref outSecurityBuffer,
ref outContextFlags);
// SSPI Workaround
// If a client sends up a blob on the initial request, Negotiate returns SEC_E_INVALID_HANDLE
// when it should return SEC_E_INVALID_TOKEN.
if (winStatus == Interop.SECURITY_STATUS.InvalidHandle && securityContext == null && !incomingBlob.IsEmpty)
{
winStatus = Interop.SECURITY_STATUS.InvalidToken;
}
Debug.Assert(outSecurityBuffer.offset == 0);
resultBlob = outSecurityBuffer.token;
resultBlobLength = outSecurityBuffer.size;
securityContext = sslContext;
contextFlags = ContextFlagsAdapterPal.GetContextFlagsPalFromInterop(outContextFlags);
return(SecurityStatusAdapterPal.GetSecurityStatusPalFromInterop(winStatus));
}
internal static SecurityStatusPal InitializeSecurityContext(
ref SafeFreeCredentials?credentialsHandle,
ref SafeDeleteContext?securityContext,
string?spn,
ContextFlagsPal requestedContextFlags,
ReadOnlySpan <byte> incomingBlob,
ChannelBinding?channelBinding,
ref byte[]?resultBlob,
out int resultBlobLength,
ref ContextFlagsPal contextFlags)
{
InputSecurityBuffers inputBuffers = default;
if (!incomingBlob.IsEmpty)
{
inputBuffers.SetNextBuffer(new InputSecurityBuffer(incomingBlob, SecurityBufferType.SECBUFFER_TOKEN));
}
if (channelBinding != null)
{
inputBuffers.SetNextBuffer(new InputSecurityBuffer(channelBinding));
}
var outSecurityBuffer = new SecurityBuffer(resultBlob, SecurityBufferType.SECBUFFER_TOKEN);
Interop.SspiCli.ContextFlags outContextFlags = Interop.SspiCli.ContextFlags.Zero;
// There is only one SafeDeleteContext type on Windows which is SafeDeleteSslContext so this cast is safe.
SafeDeleteSslContext?sslContext = (SafeDeleteSslContext?)securityContext;
Interop.SECURITY_STATUS winStatus = (Interop.SECURITY_STATUS)SSPIWrapper.InitializeSecurityContext(
GlobalSSPI.SSPIAuth,
ref credentialsHandle,
ref sslContext,
spn,
ContextFlagsAdapterPal.GetInteropFromContextFlagsPal(requestedContextFlags),
Interop.SspiCli.Endianness.SECURITY_NETWORK_DREP,
inputBuffers,
ref outSecurityBuffer,
ref outContextFlags);
securityContext = sslContext;
Debug.Assert(outSecurityBuffer.offset == 0);
resultBlob = outSecurityBuffer.token;
resultBlobLength = outSecurityBuffer.size;
contextFlags = ContextFlagsAdapterPal.GetContextFlagsPalFromInterop(outContextFlags);
return(SecurityStatusAdapterPal.GetSecurityStatusPalFromInterop(winStatus));
}
internal static SecurityStatusPal AcceptSecurityContext(
SafeFreeCredentials?credentialsHandle,
ref SafeDeleteContext?securityContext,
ContextFlagsPal requestedContextFlags,
byte[]?incomingBlob,
ChannelBinding?channelBinding,
ref byte[]?resultBlob,
ref ContextFlagsPal contextFlags)
{
InputSecurityBuffers inputBuffers = default;
if (incomingBlob != null)
{
inputBuffers.SetNextBuffer(new InputSecurityBuffer(incomingBlob, SecurityBufferType.SECBUFFER_TOKEN));
}
if (channelBinding != null)
{
inputBuffers.SetNextBuffer(new InputSecurityBuffer(channelBinding));
}
var outSecurityBuffer = new SecurityBuffer(resultBlob, SecurityBufferType.SECBUFFER_TOKEN);
Interop.SspiCli.ContextFlags outContextFlags = Interop.SspiCli.ContextFlags.Zero;
// There is only one SafeDeleteContext type on Windows which is SafeDeleteSslContext so this cast is safe.
SafeDeleteSslContext?sslContext = (SafeDeleteSslContext?)securityContext;
Interop.SECURITY_STATUS winStatus = (Interop.SECURITY_STATUS)SSPIWrapper.AcceptSecurityContext(
GlobalSSPI.SSPIAuth,
credentialsHandle,
ref sslContext,
ContextFlagsAdapterPal.GetInteropFromContextFlagsPal(requestedContextFlags),
Interop.SspiCli.Endianness.SECURITY_NETWORK_DREP,
inputBuffers,
ref outSecurityBuffer,
ref outContextFlags);
resultBlob = outSecurityBuffer.token;
securityContext = sslContext;
contextFlags = ContextFlagsAdapterPal.GetContextFlagsPalFromInterop(outContextFlags);
return(SecurityStatusAdapterPal.GetSecurityStatusPalFromInterop(winStatus));
}
internal static unsafe int AcceptSecurityContext(
ref SafeFreeCredentials?inCredentials,
ref SafeDeleteSslContext?refContext,
Interop.SspiCli.ContextFlags inFlags,
Interop.SspiCli.Endianness endianness,
InputSecurityBuffers inSecBuffers,
ref SecurityBuffer outSecBuffer,
ref Interop.SspiCli.ContextFlags outFlags)
{
#if TRACE_VERBOSE
if (NetEventSource.IsEnabled)
{
NetEventSource.Enter(null, $"credential={inCredentials}, refContext={refContext}, inFlags={inFlags}");
NetEventSource.Info(null, $"inSecBuffers.Length = {inSecBuffers.Length}");
}
#endif
if (inCredentials == null)
{
throw new ArgumentNullException(nameof(inCredentials));
}
Debug.Assert(inSecBuffers.Count <= 3);
Interop.SspiCli.SecBufferDesc inSecurityBufferDescriptor = new Interop.SspiCli.SecBufferDesc(inSecBuffers.Count);
Interop.SspiCli.SecBufferDesc outSecurityBufferDescriptor = new Interop.SspiCli.SecBufferDesc(count: 2);
// Actually, this is returned in outFlags.
bool isSspiAllocated = (inFlags & Interop.SspiCli.ContextFlags.AllocateMemory) != 0 ? true : false;
int errorCode = -1;
bool isContextAbsent = true;
if (refContext != null)
{
isContextAbsent = refContext._handle.IsZero;
}
// Optional output buffer that may need to be freed.
SafeFreeContextBuffer? outFreeContextBuffer = null;
Span <Interop.SspiCli.SecBuffer> outUnmanagedBuffer = stackalloc Interop.SspiCli.SecBuffer[2];
outUnmanagedBuffer[1].pvBuffer = IntPtr.Zero;
try
{
// Allocate always maximum to allow better code optimization.
Span <Interop.SspiCli.SecBuffer> inUnmanagedBuffer = stackalloc Interop.SspiCli.SecBuffer[3];
fixed(void *inUnmanagedBufferPtr = inUnmanagedBuffer)
fixed(void *outUnmanagedBufferPtr = outUnmanagedBuffer)
fixed(void *pinnedToken0 = inSecBuffers._item0.Token)
fixed(void *pinnedToken1 = inSecBuffers._item1.Token)
fixed(void *pinnedToken2 = inSecBuffers._item2.Token)
{
inSecurityBufferDescriptor.pBuffers = inUnmanagedBufferPtr;
// Updated pvBuffer with pinned address. UnmanagedToken takes precedence.
if (inSecBuffers.Count > 2)
{
inUnmanagedBuffer[2].BufferType = inSecBuffers._item2.Type;
inUnmanagedBuffer[2].cbBuffer = inSecBuffers._item2.Token.Length;
inUnmanagedBuffer[2].pvBuffer = inSecBuffers._item2.UnmanagedToken != null ?
(IntPtr)inSecBuffers._item2.UnmanagedToken.DangerousGetHandle() :
(IntPtr)pinnedToken2;
}
if (inSecBuffers.Count > 1)
{
inUnmanagedBuffer[1].BufferType = inSecBuffers._item1.Type;
inUnmanagedBuffer[1].cbBuffer = inSecBuffers._item1.Token.Length;
inUnmanagedBuffer[1].pvBuffer = inSecBuffers._item1.UnmanagedToken != null ?
(IntPtr)inSecBuffers._item1.UnmanagedToken.DangerousGetHandle() :
(IntPtr)pinnedToken1;
}
if (inSecBuffers.Count > 0)
{
inUnmanagedBuffer[0].BufferType = inSecBuffers._item0.Type;
inUnmanagedBuffer[0].cbBuffer = inSecBuffers._item0.Token.Length;
inUnmanagedBuffer[0].pvBuffer = inSecBuffers._item0.UnmanagedToken != null ?
(IntPtr)inSecBuffers._item0.UnmanagedToken.DangerousGetHandle() :
(IntPtr)pinnedToken0;
}
fixed(byte *pinnedOutBytes = outSecBuffer.token)
{
// Fix Descriptor pointer that points to unmanaged SecurityBuffers.
outSecurityBufferDescriptor.pBuffers = outUnmanagedBufferPtr;
// Copy the SecurityBuffer content into unmanaged place holder.
outUnmanagedBuffer[0].cbBuffer = outSecBuffer.size;
outUnmanagedBuffer[0].BufferType = outSecBuffer.type;
outUnmanagedBuffer[0].pvBuffer = outSecBuffer.token == null || outSecBuffer.token.Length == 0 ?
IntPtr.Zero :
(IntPtr)(pinnedOutBytes + outSecBuffer.offset);
outUnmanagedBuffer[1].cbBuffer = 0;
outUnmanagedBuffer[1].BufferType = SecurityBufferType.SECBUFFER_ALERT;
if (isSspiAllocated)
{
outFreeContextBuffer = SafeFreeContextBuffer.CreateEmptyHandle();
}
if (refContext == null || refContext.IsInvalid)
{
// Previous versions unconditionally built a new "refContext" here, but would pass
// incorrect arguments to AcceptSecurityContext in cases where an "contextHandle" was
// already present and non-zero.
if (isContextAbsent)
{
refContext = new SafeDeleteSslContext();
}
}
errorCode = MustRunAcceptSecurityContext_SECURITY(
ref inCredentials,
isContextAbsent,
&inSecurityBufferDescriptor,
inFlags,
endianness,
refContext !,
ref outSecurityBufferDescriptor,
ref outFlags,
outFreeContextBuffer);
if (NetEventSource.IsEnabled)
{
NetEventSource.Info(null, "Marshaling OUT buffer");
}
// No data written out but there is Alert
if (outUnmanagedBuffer[0].cbBuffer == 0 && outUnmanagedBuffer[1].cbBuffer > 0)
{
outSecBuffer.size = outUnmanagedBuffer[1].cbBuffer;
outSecBuffer.type = outUnmanagedBuffer[1].BufferType;
outSecBuffer.token = new Span <byte>((byte *)outUnmanagedBuffer[1].pvBuffer, outUnmanagedBuffer[1].cbBuffer).ToArray();
}
else
{
outSecBuffer.size = outUnmanagedBuffer[0].cbBuffer;
outSecBuffer.type = outUnmanagedBuffer[0].BufferType;
outSecBuffer.token = outUnmanagedBuffer[0].cbBuffer > 0 ?
new Span <byte>((byte *)outUnmanagedBuffer[0].pvBuffer, outUnmanagedBuffer[0].cbBuffer).ToArray() :
null;
}
}
}
}
finally
{
outFreeContextBuffer?.Dispose();
if (outUnmanagedBuffer[1].pvBuffer != IntPtr.Zero)
{
Interop.SspiCli.FreeContextBuffer(outUnmanagedBuffer[1].pvBuffer);
}
}
if (NetEventSource.IsEnabled)
{
NetEventSource.Exit(null, $"errorCode:0x{errorCode:x8}, refContext:{refContext}");
}
return(errorCode);
}
internal static unsafe int InitializeSecurityContext(
ref SafeFreeCredentials?inCredentials,
ref SafeDeleteSslContext?refContext,
string?targetName,
Interop.SspiCli.ContextFlags inFlags,
Interop.SspiCli.Endianness endianness,
InputSecurityBuffers inSecBuffers,
ref SecurityBuffer outSecBuffer,
ref Interop.SspiCli.ContextFlags outFlags)
{
#if TRACE_VERBOSE
if (NetEventSource.IsEnabled)
{
NetEventSource.Enter(null, $"credential:{inCredentials}, crefContext:{refContext}, targetName:{targetName}, inFlags:{inFlags}, endianness:{endianness}");
NetEventSource.Info(null, $"inSecBuffers.Length = {inSecBuffers.Length}");
}
#endif
if (inCredentials == null)
{
throw new ArgumentNullException(nameof(inCredentials));
}
Debug.Assert(inSecBuffers.Count <= 3);
Interop.SspiCli.SecBufferDesc inSecurityBufferDescriptor = new Interop.SspiCli.SecBufferDesc(inSecBuffers.Count);
Interop.SspiCli.SecBufferDesc outSecurityBufferDescriptor = new Interop.SspiCli.SecBufferDesc(1);
// Actually, this is returned in outFlags.
bool isSspiAllocated = (inFlags & Interop.SspiCli.ContextFlags.AllocateMemory) != 0 ? true : false;
int errorCode = -1;
bool isContextAbsent = true;
if (refContext != null)
{
isContextAbsent = refContext._handle.IsZero;
}
// Optional output buffer that may need to be freed.
SafeFreeContextBuffer?outFreeContextBuffer = null;
try
{
Span <Interop.SspiCli.SecBuffer> inUnmanagedBuffer = stackalloc Interop.SspiCli.SecBuffer[3];
fixed(void *inUnmanagedBufferPtr = inUnmanagedBuffer)
fixed(void *pinnedToken0 = inSecBuffers._item0.Token)
fixed(void *pinnedToken1 = inSecBuffers._item1.Token)
fixed(void *pinnedToken2 = inSecBuffers._item2.Token)
{
// Fix Descriptor pointer that points to unmanaged SecurityBuffers.
inSecurityBufferDescriptor.pBuffers = inUnmanagedBufferPtr;
// Updated pvBuffer with pinned address. UnmanagedToken takes precedence.
if (inSecBuffers.Count > 2)
{
inUnmanagedBuffer[2].BufferType = inSecBuffers._item2.Type;
inUnmanagedBuffer[2].cbBuffer = inSecBuffers._item2.Token.Length;
inUnmanagedBuffer[2].pvBuffer = inSecBuffers._item2.UnmanagedToken != null ?
(IntPtr)inSecBuffers._item2.UnmanagedToken.DangerousGetHandle() :
(IntPtr)pinnedToken2;
}
if (inSecBuffers.Count > 1)
{
inUnmanagedBuffer[1].BufferType = inSecBuffers._item1.Type;
inUnmanagedBuffer[1].cbBuffer = inSecBuffers._item1.Token.Length;
inUnmanagedBuffer[1].pvBuffer = inSecBuffers._item1.UnmanagedToken != null ?
(IntPtr)inSecBuffers._item1.UnmanagedToken.DangerousGetHandle() :
(IntPtr)pinnedToken1;
}
if (inSecBuffers.Count > 0)
{
inUnmanagedBuffer[0].BufferType = inSecBuffers._item0.Type;
inUnmanagedBuffer[0].cbBuffer = inSecBuffers._item0.Token.Length;
inUnmanagedBuffer[0].pvBuffer = inSecBuffers._item0.UnmanagedToken != null ?
(IntPtr)inSecBuffers._item0.UnmanagedToken.DangerousGetHandle() :
(IntPtr)pinnedToken0;
}
fixed(byte *pinnedOutBytes = outSecBuffer.token)
{
// Fix Descriptor pointer that points to unmanaged SecurityBuffers.
Interop.SspiCli.SecBuffer outUnmanagedBuffer = default;
outSecurityBufferDescriptor.pBuffers = &outUnmanagedBuffer;
outUnmanagedBuffer.cbBuffer = outSecBuffer.size;
outUnmanagedBuffer.BufferType = outSecBuffer.type;
outUnmanagedBuffer.pvBuffer = outSecBuffer.token == null || outSecBuffer.token.Length == 0 ?
IntPtr.Zero :
(IntPtr)(pinnedOutBytes + outSecBuffer.offset);
if (isSspiAllocated)
{
outFreeContextBuffer = SafeFreeContextBuffer.CreateEmptyHandle();
}
if (refContext == null || refContext.IsInvalid)
{
// Previous versions unconditionally built a new "refContext" here, but would pass
// incorrect arguments to InitializeSecurityContextW in cases where an "contextHandle" was
// already present and non-zero.
if (isContextAbsent)
{
refContext = new SafeDeleteSslContext();
}
}
if (targetName == null || targetName.Length == 0)
{
targetName = dummyStr;
}
string punyCode = s_idnMapping.GetAscii(targetName);
fixed(char *namePtr = punyCode)
{
errorCode = MustRunInitializeSecurityContext(
ref inCredentials,
isContextAbsent,
(byte *)(((object)targetName == (object)dummyStr) ? null : namePtr),
inFlags,
endianness,
&inSecurityBufferDescriptor,
refContext !,
ref outSecurityBufferDescriptor,
ref outFlags,
outFreeContextBuffer);
}
if (NetEventSource.IsEnabled)
{
NetEventSource.Info(null, "Marshalling OUT buffer");
}
// Get unmanaged buffer with index 0 as the only one passed into PInvoke.
outSecBuffer.size = outUnmanagedBuffer.cbBuffer;
outSecBuffer.type = outUnmanagedBuffer.BufferType;
outSecBuffer.token = outSecBuffer.size > 0 ?
new Span <byte>((byte *)outUnmanagedBuffer.pvBuffer, outUnmanagedBuffer.cbBuffer).ToArray() :
null;
}
}
}
finally
{
outFreeContextBuffer?.Dispose();
}
if (NetEventSource.IsEnabled)
{
NetEventSource.Exit(null, $"errorCode:0x{errorCode:x8}, refContext:{refContext}");
}
return(errorCode);
}
