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How to set Access/Restrictions on users logins

Time Based Restrictions
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/

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.


2. Allow users A & B to login on all days between 8 am and 5 pm except for Sunday.


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/

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


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