These examples will limit the login times of certain users. See /etc/security/time.conf for more information/examples. In order to place time restrictions on user logins, the following must be placed in /etc/pam.d/login:
account required /lib/security/pam_time.so
The remaining lines should be placed in /etc/security/time.conf.
1. Only allow user nikesh to login during on weekdays between 7 am and 5 pm.
login;*;nikesh;Wd0700-1700
2. Allow users A & B to login on all days between 8 am and 5 pm except for Sunday.
login;*;A|B;AlSu0800-1700
If a day is specified more than once, it is unset. So in the above example, Sunday is specified twice (Al = All days, Su = Sunday). This causes it to be unset, so this rule applies to all days except Sunday.
Access Based Restrictions
/etc/security/access.conf can be used to restrict access by terminal or host. The following must be placed in /etc/pam.d/login in order for these examples to work:
account required /lib/security/pam_access.so
1. Deny nikesh login access on all terminals except for tty1:
-:nikesh:ALL EXCEPT tty1
2. Users in the group operator are only allowed to login from a local terminal:
-:operator:ALL EXCEPT LOCAL
3. Allow user A to only login from a trusted server:
-:A:ALL EXCEPT trusted.somedomain.com
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source:http://linuxpoison.blogspot.com/2009/05/135781757111023.html