login.access5

Overview

The login.access file specifies on which ttys or from which hosts certain users are allowed to login.

At login, the /etc/login.access file is checked for the first entry that matches a specific user/host or user/tty combination. That entry can either allow or deny login access to that user.

Each entry have three fields separated by colon:

• The first field indicates the permission given if the entry matches. It can be either “+” (allow access) or “-” (deny access) .

• The second field is a comma separated list of users or groups for which the current entry applies. NIS netgroups can used (if configured) if preceeded by @. The magic string ALL matches all users. A group will match if the user is a member of that group, or it is the user's primary group.

• The third field is a list of ttys, or network names. A network name can be either a hostname, a domain (indicated by a starting period), or a netgroup. As with the user list, ALL matches anything. LOCAL matches a string not containing a period.

If the string EXCEPT is found in either the user or from list, the rest of the list are exceptions to the list before EXCEPT.