The preauth plugin interface was introduced in 1.6 but was never made
a public API.  In preparation for making it public in 1.10, convert it
to use the new plugin framework.  This will require changes to any
existing preauth plugins.

A number of symbols were renamed for namespace cleanliness, and
abstract types were introduced for module data and module per-request
data for better type safety.

On the consumer end (preauth2.c and kdc_preauth.c), this is a pretty
rough conversion.  Eventually we should create proper consumer APIs
with module handles, and the flat lists of preauth types should hold
pointers to module handles rather than copies of the vtables.  The
built-in preauth type handlers should then be converted to built-in
module providers linked into the consumer code (as should encrypted
challenge, since it has no external dependencies).  None of this will
impact the provider API for preauth plugins, so it can wait.

ticket: 6921

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@24970 dc483132-0cff-0310-8789-dd5450dbe970

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@23738 dc483132-0cff-0310-8789-dd5450dbe970

ticket: 4377
status: open

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@18693 dc483132-0cff-0310-8789-dd5450dbe970

Patch from Nalin Dahyabhai at Redhat to implement a preauthentication
framework based on the plugin architecture.  Currently. the API is
considered internal and the header is not installed.
See src/include/krb5/preauth_plugin.h for the interface.

ticket: new
Tags: enhancement
Status: open

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@18641 dc483132-0cff-0310-8789-dd5450dbe970