143 lines
4 KiB
Groff
143 lines
4 KiB
Groff
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.\" $NetBSD: passwd.1,v 1.28 2006/03/07 01:52:09 hubertf Exp $
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.\"
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.\" Copyright (c) 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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.\" from: @(#)passwd.1 8.1 (Berkeley) 6/6/93
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.\"
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.Dd February 25, 2005
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.Dt PASSWD 1
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.Os
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.Sh NAME
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.Nm passwd
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.Nd modify a user's password
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.Sh SYNOPSIS
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.Nm
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.Op Ar user
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.Nm
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.Oo Fl d Ar files | Fl l Oc
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.Op Ar user
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.Nm
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.Oo Fl d Ar nis | Fl y Oc
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.Op Ar user
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.Nm
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.Oo Fl d Ar krb5 | Fl k Oc
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.Op Ar principal
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.Sh DESCRIPTION
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.Nm
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changes the user's password.
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First, the user is
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prompted for their current password.
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If the current password is correctly typed, a new password is
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requested.
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The new password must be entered twice to avoid typing errors.
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.Pp
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The new password should be at least six characters long and not
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purely alphabetic.
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Its total length must be less than
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.Dv _PASSWORD_LEN
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(currently 128 characters).
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Numbers, upper case letters and meta characters
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are encouraged.
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.Pp
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All options may not be available on all systems.
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.Bl -tag -width flag
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.It Fl d Ar database
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This option specifies the password database that should be updated. The
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following databases are supported:
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.Bl -tag -width files
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.It files
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This specifies that the password change should be applied to the local
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password file.
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When changing only the local password,
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.Nm
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uses
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.Xr pwd_mkdb 8
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to update the password databases.
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.It nis
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This specifies that the password change should be applied to the NIS
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password database.
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The
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.Xr rpc.yppasswdd 8
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daemon should be running on the master NIS server.
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.It krb5
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This specifies that the user's Kerberos 5 password should be changed.
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The host must be configured to use Kerberos.
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See
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.Xr krb5.conf 5 .
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.El
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.It Fl l
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This is the equivalent of
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.Fl d Ar files .
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.It Fl y
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This is the equivalent of
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.Fl d Ar nis .
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.It Fl k
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This is the equivalent of
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.Fl d Ar krb5 .
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.El
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.Pp
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If a password database is not specified,
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.Nm
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will change the password database as determined by the
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Pluggable Authentication Module
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.Pq PAM
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library.
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.Pp
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The type of cipher used to encrypt the password depends on the configuration
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in
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.Xr passwd.conf 5 .
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It can be different for local and NIS passwords.
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.Sh FILES
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.Bl -tag -width /etc/master.passwd -compact
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.It Pa /etc/master.passwd
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The user database
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.It Pa /etc/passwd
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A Version 7 format password file
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.It Pa /etc/passwd.XXXXXX
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Temporary copy of the password file
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.El
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.Sh SEE ALSO
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.Xr chpass 1 ,
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.Xr login 1 ,
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.Xr pwhash 1 ,
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.Xr passwd 5 ,
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.Xr passwd.conf 5 ,
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.Xr pam 8 ,
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.Xr pwd_mkdb 8 ,
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.Xr vipw 8
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.Rs
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.%A Robert Morris
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.%A Ken Thompson
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.%T "UNIX password security"
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.Re
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v6 .
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