[PATCH 00/07][RFC] RACF audit plugin

[Klaus Heinrich Kiwi <klausk@br.ibm.com>]

List,

the IBM z/OS v1R8 brings remote authorization and auditing capabilities
to its 'Resource Access Control Facility' (RACF), through the
implementation of two LDAP extended operations in the IBM Tivoli
Directory Server (ITDS) - ITDS is the latest version of the z/OS LDAP
server.
The patches in the following messages implements a remote auditing
plugin for RACF, targeting to forward events from the Linux audit
subsystem for consolidation in a z/OS server.
Please review.

How it works:
=============
Using the auparse_feed() interface, the plugin reads from stdin, feeding
whatever gets in to the auparse_feed(). When a complete event is
gathered, the 'push_event()' callback is called, which encodes the event
into a BER buffer and pushes it to a queue (queue size can be
configured). A second thread dequeues it and issues the LDAP extended
operation, waiting for the response in a synchronous way. Once we got a
response, we decode it and verify if the event submission was successful
(we could skip this step right now since we're doing the submission in a
'best-effort' fashion, but its desirable to check whether the event got
in or not right now, giving a better diagnosis of the reason).
It is also desirable to keep the event for future submission in case of
a network outage for example, although this deserves better thinking
related to keeping a parallel audit log file.

TODO list:
==========
- SELinux policy (currently, the plugin runs under the audit daemon
domain, which denies some network operations, for example)
- Man page
- code cleanups where possible
- store-and-forward in case of network outages (design suggestions are
welcome)
- Fix queue issues in SIGHUP situations
- Better integrate the plug-in into the audit.spec file


Comments are very welcome,

Klaus
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