pam_cracklib: uses the cracklib library to check the
"strength" of a password and to check it was not built based on the old one.
pam_limits: this module can restrict, depending on the
user and/or group, the number of simultaneous processes, CPU time, the
number of files simultaneously opened, their size, the maximum number of
simultaneous connexions.
The configuration file is: /etc/security/limits.conf
pam_rootok: enables root to access a service without
using his password. To be used with chfn or chsh and not
with login.
pam_time: control the access time. The configuration file
is: /etc/security/time.conf .
pam_wheel: allow access to root only to users of the
wheel group. For use with su.
pam_cap: this module can force all privilges to a user.
Linux's Security Capabilities
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