pam_group -- PAM module for group access
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DESCRIPTION

   The pam_group PAM module does not authenticate the user, but instead it
   grants group memberships (in the credential setting phase of the
   authentication module) to the user. Such memberships are based on the
   service they are applying for.

   By default rules for group memberships are taken from config file
   /etc/security/group.conf.

   If /etc/security/group.conf does not exist,
   %vendordir%/security/group.conf is used.

   This module's usefulness relies on the file-systems accessible to the
   user. The point being that once granted the membership of a group, the
   user may attempt to create a setgid binary with a restricted group
   ownership. Later, when the user is not given membership to this group,
   they can recover group membership with the precompiled binary. The
   reason that the file-systems that the user has access to are so
   significant, is the fact that when a system is mounted nosuid the user
   is unable to create or execute such a binary file. For this module to
   provide any level of security, all file-systems that the user has write
   access to should be mounted nosuid.

   The pam_group module functions in parallel with the /etc/group file. If
   the user is granted any groups based on the behavior of this module,
   they are granted in addition to those entries /etc/group (or
   equivalent).

EXAMPLES

   These are some example lines which might be specified in
   /etc/security/group.conf.

   Running 'xsh' on tty* (any ttyXXX device), the user 'us' is given
   access to the floppy (through membership of the floppy group)
xsh;tty*&!ttyp*;us;Al0000-2400;floppy

   Running 'xsh' on tty* (any ttyXXX device), the users 'sword', 'pike'
   and 'shield' are given access to games (through membership of the
   floppy group) after work hours.
xsh; tty* ;sword|pike|shield;!Wk0900-1800;games, sound
xsh; tty* ;*;Al0900-1800;floppy

   Any member of the group 'admin' running 'xsh' on tty*, is granted
   access (at any time) to the group 'plugdev'
xsh; tty* ;%admin;Al0000-2400;plugdev
