login.access manual page
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appl/login/login.access.5
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.\" $Id$
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.\"
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.Dd March 21, 2003
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.Dt LOGIN.ACCESS 5
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.Os HEIMDAL
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.Sh NAME
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.Nm login.access
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.Nd
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login access control table
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.Sh DESCRIPTION
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The
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.Nm login.access
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file specifies on which ttys or from which hosts certain users are
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allowed to login.
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.Pp
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At login, the
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.Pa /etc/login.access
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file is checked for the first entry that matches a specific user/host
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or user/tty combination. That entry can either allow or deny login
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access to that user.
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.Pp
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Each entry have three fields separated by colon:
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.Bl -bullet
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.It
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The first field indicates the permission given if the entry matches.
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It can be either
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.Dq +
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(allow access)
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or
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.Dq -
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(deny access) .
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.It
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The second field is a comma separated list of users or groups for
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which the current entry applies. NIS netgroups can used (if
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configured) if preceeded by @. The magic string ALL matches all users.
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A group will match if the user is a member of that group, or it is the
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user's primary group.
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.It
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The third field is a list of ttys, or network names. A network name
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can be either a hostname, a domain (indicated by a starting period),
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or a netgroup. As with the user list, ALL matches anything. LOCAL
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matches a string not containing a period.
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.El
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.Pp
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If the string EXCEPT is found in either the user or from list, the
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rest of the list are exceptions to the list before EXCEPT.
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.Sh BUGS
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If there's a user and a group with the same name, there is no way to
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make the group match if the user also matches.
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.Sh SEE ALSO
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.Xr login 1
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.Sh AUTHORS
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The
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.Fn login_access
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function was written by
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Wietse Venema. This manual page was written for Heimdal.
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