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login.access — login access control table
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.
If there's a user and a group with the same name, there is no way to make
the group match if the user also matches.
The login_access() function was written by Wietse Venema. This manual
page was written for Heimdal.
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