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