.NET implementation uses fixed buffer size

[kentcb]

The .NET implementation uses a buffer size specified by Secur32.MAX_TOKEN_SIZE, which is currently set to 12KB. For tokens that exceed this size, an exception is raised:

System.ComponentModel.Win32Exception (0x80004005): The buffers supplied to a function was too small
   at Waffle.Windows.AuthProvider.WindowsSecurityContext..ctor(String username, WindowsCredentialsHandle credentials, String securityPackage, Int32 fContextReq, Int32 targetDataRep)
   at Waffle.Windows.AuthProvider.WindowsSecurityContext.GetCurrent(String package, String targetName, Int32 fContextReq, Int32 targetDataRep)

A similar issue in the Java implementation was fixed around a year ago (see ebedaf7). The .NET implementation should take the same approach.

[hazendaz]

@kentcb Is it possible that you can do a pull request for this? I see where i think the issue is and understand what you need fixed, however, I'm not a .net developer nor have anything setup to run tests verifying the fix so need a little help.

[kentcb]

@hazendaz yes, I plan on doing this once I return to Australia later this week.

[dblock]

Fixed via 6a8bd45, thanks @kentcb.