Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
165 lines
4.8 KiB
Groff
165 lines
4.8 KiB
Groff
.\" Copyright (c) 1980, 1990, 1993
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.\" The Regents of the University of California. 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, are 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, 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. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)login.1 8.2 (Berkeley) 5/5/94
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.\" $FreeBSD$
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.\"
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.Dd September 13, 2006
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.Dt LOGIN 1
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.Os
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.Sh NAME
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.Nm login
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.Nd log into the computer
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.Sh SYNOPSIS
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.Nm
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.Op Fl fp
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.Op Fl h Ar hostname
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.Op Ar user
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.Sh DESCRIPTION
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The
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.Nm
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utility logs users (and pseudo-users) into the computer system.
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.Pp
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If no user is specified, or if a user is specified and authentication
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of the user fails,
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.Nm
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prompts for a user name.
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Authentication of users is configurable via
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.Xr pam 8 .
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Password authentication is the default.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl f
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When a user name is specified, this option indicates that proper
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authentication has already been done and that no password need be
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requested.
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This option may only be used by the super-user or when an already
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logged in user is logging in as themselves.
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.It Fl h
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Specify the host from which the connection was received.
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It is used by various daemons such as
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.Xr telnetd 8 .
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This option may only be used by the super-user.
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.It Fl p
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By default,
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.Nm
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discards any previous environment.
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The
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.Fl p
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option disables this behavior.
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.El
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.Pp
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Login access can be controlled via
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.Xr login.access 5
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or the login class in
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.Xr login.conf 5 ,
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which provides
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allow and deny records based on time, tty and remote host name.
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.Pp
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If the file
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.Pa /etc/fbtab
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exists,
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.Nm
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changes the protection and ownership of certain devices specified in this
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file.
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.Pp
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Immediately after logging a user in,
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.Nm
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displays the system copyright notice, the date and time the user last
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logged in, the message of the day as well as other information.
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If the file
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.Pa .hushlogin
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exists in the user's home directory, all of these messages are suppressed.
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This is to simplify logins for non-human users, such as
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.Xr uucp 1 .
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.Pp
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The
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.Nm
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utility enters information into the environment (see
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.Xr environ 7 )
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specifying the user's home directory (HOME), command interpreter (SHELL),
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search path (PATH), terminal type (TERM) and user name (both LOGNAME and
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USER).
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Other environment variables may be set due to entries in the login
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class capabilities database, for the login class assigned in the
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user's system passwd record.
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The login class also controls the maximum and current process resource
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limits granted to a login, process priorities and many other aspects of
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a user's login environment.
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.Pp
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Some shells may provide a builtin
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.Nm
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command which is similar or identical to this utility.
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Consult the
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.Xr builtin 1
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manual page.
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.Pp
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The
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.Nm
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utility will submit an audit record when login succeeds or fails.
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Failure to determine the current auditing state will
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result in an error exit from
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.Nm .
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.Sh FILES
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.Bl -tag -width ".Pa /etc/security/audit_control" -compact
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.It Pa /etc/fbtab
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changes device protections
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.It Pa /etc/login.conf
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login class capabilities database
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.It Pa /etc/motd
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message-of-the-day
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.It Pa /var/mail/user
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system mailboxes
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.It Pa \&.hushlogin
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makes login quieter
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.It Pa /etc/pam.d/login
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.Xr pam 8
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configuration file
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.It Pa /etc/security/audit_user
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user flags for auditing
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.It Pa /etc/security/audit_control
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global flags for auditing
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.El
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.Sh SEE ALSO
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.Xr builtin 1 ,
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.Xr chpass 1 ,
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.Xr csh 1 ,
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.Xr newgrp 1 ,
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.Xr passwd 1 ,
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.Xr rlogin 1 ,
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.Xr getpass 3 ,
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.Xr fbtab 5 ,
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.Xr login.access 5 ,
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.Xr login.conf 5 ,
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.Xr environ 7
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.Sh HISTORY
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A
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.Nm
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utility appeared in
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.At v6 .
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