110 lines
4.1 KiB
Groff
110 lines
4.1 KiB
Groff
.\" Copyright (c) 1995 David Nugent <davidn@blaze.net.au>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, is permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice immediately at the beginning of the file, without modification,
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.\" this list of conditions, and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. This work was done expressly for inclusion into FreeBSD. Other use
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.\" is permitted provided this notation is included.
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.\" 4. Absolutely no warranty of function or purpose is made by the author
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.\" David Nugent.
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.\" 5. Modifications may be freely made to this file providing the above
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.\" conditions are met.
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.\"
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.\" $Id$
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.\"
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.Dd January 2, 1997
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.Os FreeBSD
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.Dt LOGIN_OK 3
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.Sh NAME
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.Nm auth_ttyok
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.Nm auth_hostok
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.Nm auth_timeok
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.Nd Functions for checking login class based login restrictions
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <time.h>
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.Fd #include <login_cap.h>
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.Ft int
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.Fn auth_ttyok "login_cap_t *lc" "const char *tty"
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.Ft int
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.Fn auth_hostok "login_cap_t *lc" "const char *host" "char const *ip"
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.Ft int
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.Fn auth_timeok "login_cap_t *lc" "time_t t"
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.Sh DESCRIPTION
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This set of functions checks to see if login is allowed based on login
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class capability entries in the login database,
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.Xr login.conf 5 .
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.Pp
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.Fn auth_ttyok
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checks to see if the named tty is available to users of a specific
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class, and is either in the "ttys.allow" access list, and not in
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the "ttys.deny" access list.
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An empty "ttys.allowed" list (or if no such capability exists for
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the give login class) logins via any tty device are allowed unless
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the "ttys.deny" list exists and is non-empty, and the device or its
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tty group (see
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.Xr ttys 5 )
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is not in the list.
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Access to ttys may be allowed or restricted specifically by tty device
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name, a device name which includes a wildcard (e.g. ttyD* or cuaD*),
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or may name a ttygroup, when group=<name> tags have been assigned in
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.Pa /etc/ttys .
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Matching of ttys and ttygroups is case sensitive.
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Passing a NULL or empty string as the
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.Ar tty
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parameter causes the function to return a non-zero value.
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.Pp
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.Fn auth_hostok
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checks for any host restrictions for remote logins.
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The function checks on both a host name and IP address (given in its
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text form, typically n.n.n.n) against the "host.allow" and "host.deny"
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login class capabilities.
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As with ttys and their groups, wildcards and character classes may be
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used in the host allow and deny capability records.
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The
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.Xr fnmatch 3
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function is used for matching, and the matching on hostnames is case
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insensitive.
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Note that this function expects that the hostname is fully expanded
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(i.e. the local domain name added if necessary) and the IP address
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is in its canonical form.
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No hostname or address lookups are attempted.
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.Pp
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It is possible to call this function with either the hostname or
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the IP address missing (i.e. NULL) and matching will be performed
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only on the basis of the parameter given.
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Passing NULL or empty strings in both parameters will result in
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a non-zero return value.
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.Pp
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The
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.Fn auth_timeok
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function checks to see that a given time value is within the
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"times.allow" login class capability and not within the
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"times.deny" access lists.
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An empty or non-existent "times.allow" list allows access at any
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time, except if a given time is falls within a period in the
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"times.deny" list.
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The format of time period records contained in both "times.allow"
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and "times.deny" capability fields is explained in detail in the
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.Xr login_times 3
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manual page.
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.Sh RETURN VALUES
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A non-zero return value from any of these functions indicates that
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login access is granted.
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A zero return value means either that the item being tested is not
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in the "allow" access list, or is within the "deny" access list.
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.Sh SEE ALSO
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.Xr login.conf 5 ,
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.Xr login_cap 3 ,
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.Xr login_class 3 ,
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.Xr login_times 3 ,
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.Xr termcap 5 ,
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.Xr getcap 3
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