Plugins and ASN.1

[Sam Hartman]

Hi folks.

We noticed today when going through some recent Novell patches that
code using the internals of the ASN.1 library had been added to the
LDAP plugin.

There's a fairly strict abstraction barrier around the inner parts of
the ASN.1 library.  Routines from krb5_encode.c and krb5_decode.c can
be called from anyone who includes k5-int.h.

However anything requiring the header files or asn1_*.c files needs to
remain in lib/krb5/asn.1.

In practice that means encoders and decoders for plugin data
structures need to live in the main krb5 library.

I don't know of a good way around this without opening some rather
messy abstractions to the plugins.