You can get a copy of the defunct POSIX draft specification for
capabilities, ACLs and some other interesting things here:

  http://wt.xpilot.org/publications/posix.1e/

If you are looking for ACL patches for kernels, take a look here:

  http://acl.bestbits.at/download.html

As for this site, things that can be found here are:

Regular libcap (support for 2.6.x linux capabilities):

  http://www.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/

To get the full experience, you should be sure to enable the
experimental filesystem capability support.

There is a git tree for libcap here:

  git://git.kernel.org/pub/scm/libs/libcap/libcap.git

More info in

  http://www.kernel.org/pub/linux/libs/security/linux-privs/libcap2/README

Earlier experiments with file capabilities are to be found in:

  http://www.kernel.org/pub/linux/libs/security/linux-privs/old

Cheers

Andrew
2007/11/08