[1/2] kerberos: Add a stub for Kerberos5 Authentication Package.

[Hans Leidekker]

On Tue, 2017-10-17 at 14:57 +0200, Jacek Caban wrote:
> On 10/17/17 1:07 PM, Hans Leidekker wrote:
> > Thanks. Alexandre pointed out that we do not need to load libkrb5
> > dynamically because libgssapi_krb5 depends on libkrb5. So if libkrb5
> > is missing the SSP wouldn't be usable anyway.
> 
> I do not think that a not functioning stub (when dependencies are 
> missing) is useless. I added the stub because it was needed (and enough) 
> for Office 2013 installer. The installer needs to register 
> authentication info for its RPC server successfully. As long as no 
> actual authentication is done (and installer also registers NTLM info, 
> which is used in practice), a stub is enough.
> 
> That said, if EnumerateSecurityPackagesW will not return kerberos 
> without libkrb5 available, libkrb5 will become a hard dependency of 
> Office 2013 installer (and Office 2016 I guess, but I didn't verify 
> that). It might be okay, but please take that into account in 
> considerations.

Right, this is why I left the stubs in when building without Kerberos
support. We could keep the stub provider in secur32 as a fallback, or
build kerberos.dll in all cases but with stubs if support is missing.