/// <summary>
/// Queries a string-valued context attribute by the named attribute.
/// </summary>
/// <param name="attrib">The string-valued attribute to query.</param>
/// <returns></returns>
private string QueryContextString(ContextQueryAttrib attrib)
{
SecPkgContext_String stringAttrib;
SecurityStatus status = SecurityStatus.InternalError;
string result = null;
bool gotRef = false;
if (attrib != ContextQueryAttrib.Names && attrib != ContextQueryAttrib.Authority)
{
throw new InvalidOperationException("QueryContextString can only be used to query context Name and Authority attributes");
}
stringAttrib = new SecPkgContext_String();
RuntimeHelpers.PrepareConstrainedRegions();
try
{
this.ContextHandle.DangerousAddRef(ref gotRef);
}
catch (Exception)
{
if (gotRef)
{
this.ContextHandle.DangerousRelease();
gotRef = false;
}
throw;
}
finally
{
if (gotRef)
{
status = ContextNativeMethods.QueryContextAttributes_String(
ref this.ContextHandle.rawHandle,
attrib,
ref stringAttrib
);
this.ContextHandle.DangerousRelease();
if (status == SecurityStatus.OK)
{
result = Marshal.PtrToStringUni(stringAttrib.StringResult);
ContextNativeMethods.FreeContextBuffer(stringAttrib.StringResult);
}
}
}
if (status == SecurityStatus.Unsupported)
{
return(null);
}
else if (status != SecurityStatus.OK)
{
throw new SspiException("Failed to query the context's associated user name", status);
}
return(result);
}
internal static extern SecurityStatus QueryContextAttributes_String(
ref RawSspiHandle contextHandle,
ContextQueryAttrib attrib,
ref SecPkgContext_String names
);
internal static SecurityStatus SafeQueryContextAttribute(
SafeContextHandle handle,
ContextQueryAttrib attribute,
ref byte[] buffer
)
{
bool gotRef = false;
SecurityStatus status = SecurityStatus.InternalError;
RuntimeHelpers.PrepareConstrainedRegions();
int pointerSize = System.Environment.Is64BitOperatingSystem ? 8 : 4; //NOTE: update this when 128 bit processors exist
IntPtr alloc_buffer = Marshal.AllocHGlobal(sizeof(uint) + pointerSize); //NOTE: this is at most 4 + sizeof(void*) bytes
//see struct SecPkgContext_SessionKey
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa380096(v=vs.85).aspx
try
{
handle.DangerousAddRef(ref gotRef);
}
catch (Exception)
{
if (gotRef)
{
handle.DangerousRelease();
gotRef = false;
buffer = null;
}
throw;
}
finally
{
if (gotRef)
{
status = ContextNativeMethods.QueryContextAttributes(
ref handle.rawHandle,
attribute,
alloc_buffer
);
if (status == SecurityStatus.OK)
{
KeyStruct key = new KeyStruct();
Marshal.PtrToStructure(alloc_buffer, key); // fit to the proper size, read a byte[]
byte[] sizedBuffer = new byte[key.size];
for (int i = 0; i < key.size; i++)
{
sizedBuffer[i] = Marshal.ReadByte(key.data, i);
}
buffer = sizedBuffer;
}
handle.DangerousRelease();
}
}
Marshal.FreeHGlobal(alloc_buffer);
return(status);
}
internal static extern SecurityStatus QueryContextAttributes(
ref RawSspiHandle contextHandle,
ContextQueryAttrib attrib,
IntPtr attribute
);
/// <summary>
/// Queries a string-valued context attribute by the named attribute.
/// </summary>
/// <param name="attrib">The string-valued attribute to query.</param>
/// <returns></returns>
private string QueryContextString(ContextQueryAttrib attrib)
{
SecPkgContext_String stringAttrib;
SecurityStatus status = SecurityStatus.InternalError;
string result = null;
bool gotRef = false;
if( attrib != ContextQueryAttrib.Names && attrib != ContextQueryAttrib.Authority )
{
throw new InvalidOperationException( "QueryContextString can only be used to query context Name and Authority attributes" );
}
stringAttrib = new SecPkgContext_String();
RuntimeHelpers.PrepareConstrainedRegions();
try
{
this.ContextHandle.DangerousAddRef( ref gotRef );
}
catch ( Exception )
{
if ( gotRef )
{
this.ContextHandle.DangerousRelease();
gotRef = false;
}
throw;
}
finally
{
if ( gotRef )
{
status = ContextNativeMethods.QueryContextAttributes_String(
ref this.ContextHandle.rawHandle,
attrib,
ref stringAttrib
);
this.ContextHandle.DangerousRelease();
if ( status == SecurityStatus.OK )
{
result = Marshal.PtrToStringUni( stringAttrib.StringResult );
ContextNativeMethods.FreeContextBuffer( stringAttrib.StringResult );
}
}
}
if( status == SecurityStatus.Unsupported )
{
return null;
}
else if( status != SecurityStatus.OK )
{
throw new SSPIException( "Failed to query the context's associated user name", status );
}
return result;
}
internal static extern SecurityStatus QueryContextAttributes_String(
ref RawSspiHandle contextHandle,
ContextQueryAttrib attrib,
ref SecPkgContext_String names
);