423 lines
12 KiB
Groff
423 lines
12 KiB
Groff
.\" Copyright (c) 1988, 1990, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, 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. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)chpass.1 8.2 (Berkeley) 12/30/93
|
|
.\" $Id: chpass.1,v 1.9 1997/06/25 06:59:54 charnier Exp $
|
|
.\"
|
|
.Dd December 30, 1993
|
|
.Dt CHPASS 1
|
|
.Os
|
|
.Sh NAME
|
|
.Nm chpass, chfn, chsh, ypchpass, ypchfn, ypchsh
|
|
.Nd add or change user database information
|
|
.Sh SYNOPSIS
|
|
.Nm chpass
|
|
.Op Fl a Ar list
|
|
.Op Fl p Ar encpass
|
|
.Op Fl s Ar newshell
|
|
.Op user
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm chpass
|
|
program
|
|
allows editing of the user database information associated
|
|
with
|
|
.Ar user
|
|
or, by default, the current user.
|
|
The information is formatted and supplied to an editor for changes.
|
|
.Pp
|
|
Only the information that the user is allowed to change is displayed.
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width flag
|
|
.It Fl a
|
|
The super-user is allowed to directly supply a user database
|
|
entry, in the format specified by
|
|
.Xr passwd 5 ,
|
|
as an argument.
|
|
This argument must be a colon (``:'') separated list of all the
|
|
user database fields, although they may be empty.
|
|
.It Fl p
|
|
The super-user is allowed to directly supply an encrypted password field,
|
|
in the format used by
|
|
.Xr crypt 3 ,
|
|
as an argument.
|
|
.It Fl s
|
|
The
|
|
.Fl s
|
|
option attempts to change the user's shell to
|
|
.Ar newshell .
|
|
.El
|
|
.Pp
|
|
Possible display items are as follows:
|
|
.Pp
|
|
.Bl -tag -width "Home Directory:" -compact -offset indent
|
|
.It Login:
|
|
user's login name
|
|
.It Password:
|
|
user's encrypted password
|
|
.It Uid:
|
|
user's login
|
|
.It Gid:
|
|
user's login group
|
|
.It Change:
|
|
password change time
|
|
.It Expire:
|
|
account expiration time
|
|
.It Class:
|
|
user's general classification
|
|
.It Home Directory:
|
|
user's home directory
|
|
.It Shell:
|
|
user's login shell
|
|
.It Full Name:
|
|
user's real name
|
|
.It Location:
|
|
user's normal location
|
|
.It Home Phone:
|
|
user's home phone
|
|
.It Office Phone:
|
|
user's office phone
|
|
.El
|
|
.Pp
|
|
The
|
|
.Ar login
|
|
field is the user name used to access the computer account.
|
|
.Pp
|
|
The
|
|
.Ar password
|
|
field contains the encrypted form of the user's password.
|
|
.Pp
|
|
The
|
|
.Ar uid
|
|
field is the number associated with the
|
|
.Ar login
|
|
field.
|
|
Both of these fields should be unique across the system (and often
|
|
across a group of systems) as they control file access.
|
|
.Pp
|
|
While it is possible to have multiple entries with identical login names
|
|
and/or identical user id's, it is usually a mistake to do so. Routines
|
|
that manipulate these files will often return only one of the multiple
|
|
entries, and that one by random selection.
|
|
.Pp
|
|
The
|
|
.Ar group
|
|
field is the group that the user will be placed in at login.
|
|
Since BSD supports multiple groups (see
|
|
.Xr groups 1 )
|
|
this field currently has little special meaning.
|
|
This field may be filled in with either a number or a group name (see
|
|
.Xr group 5 ) .
|
|
.Pp
|
|
The
|
|
.Ar change
|
|
field is the date by which the password must be changed.
|
|
.Pp
|
|
The
|
|
.Ar expire
|
|
field is the date on which the account expires.
|
|
.Pp
|
|
Both the
|
|
.Ar change
|
|
and
|
|
.Ar expire
|
|
fields should be entered in the form ``month day year'' where
|
|
.Ar month
|
|
is the month name (the first three characters are sufficient),
|
|
.Ar day
|
|
is the day of the month, and
|
|
.Ar year
|
|
is the year.
|
|
.Pp
|
|
The
|
|
.Ar class
|
|
field is currently unused. In the near future it will be a key to
|
|
a
|
|
.Xr termcap 5
|
|
style database of user attributes.
|
|
.Pp
|
|
The user's
|
|
.Ar home directory
|
|
is the full UNIX path name where the user
|
|
will be placed at login.
|
|
.Pp
|
|
The
|
|
.Ar shell
|
|
field is the command interpreter the user prefers.
|
|
If the
|
|
.Ar shell
|
|
field is empty, the Bourne shell,
|
|
.Pa /bin/sh ,
|
|
is assumed.
|
|
When altering a login shell, and not the super-user, the user
|
|
may not change from a non-standard shell or to a non-standard
|
|
shell.
|
|
Non-standard is defined as a shell not found in
|
|
.Pa /etc/shells .
|
|
.Pp
|
|
The last four fields are for storing the user's
|
|
.Ar full name , office location ,
|
|
and
|
|
.Ar work
|
|
and
|
|
.Ar home telephone
|
|
numbers.
|
|
.Pp
|
|
Once the information has been verified,
|
|
.Nm chpass
|
|
uses
|
|
.Xr pwd_mkdb 8
|
|
to update the user database.
|
|
.Sh ENVIRONMENT
|
|
The
|
|
.Xr vi 1
|
|
editor will be used unless the environment variable EDITOR is set to
|
|
an alternate editor.
|
|
When the editor terminates, the information is re-read and used to
|
|
update the user database itself.
|
|
Only the user, or the super-user, may edit the information associated
|
|
with the user.
|
|
.Sh NIS INTERACTION
|
|
.Nm Chpass
|
|
can also be used in conjunction with NIS, however some restrictions
|
|
apply.
|
|
Currently,
|
|
.Nm chpass
|
|
can only make changes to the NIS passwd maps through
|
|
.Xr rpc.yppasswdd 8 ,
|
|
which normally only permits changes to a user's password, shell and GECOS
|
|
fields. Except when invoked by the super-user on the NIS master server,
|
|
.Nm chpass
|
|
(and, similarly,
|
|
.Xr passwd 1 )
|
|
can not use the
|
|
.Xr rpc.yppasswdd 8
|
|
server to change other user information or
|
|
add new records to the NIS passwd maps.
|
|
Furthermore,
|
|
.Xr rpc.yppasswdd 8
|
|
requires password authentication before it will make any
|
|
changes. The only user allowed to submit changes without supplying
|
|
a password is the super-user on the NIS master server; all other users,
|
|
including those with root privileges on NIS clients (and NIS slave
|
|
servers) must enter a password.
|
|
(The super-user on the NIS master is allowed to bypass these restrictions
|
|
largely for convenience: a user with root access
|
|
to the NIS master server already has the privileges required to make
|
|
updates to the NIS maps, but editing the map source files by hand can
|
|
be cumbersome.
|
|
.Pp
|
|
Note: these exceptions only apply when the NIS master server is a
|
|
FreeBSD system.)
|
|
.Pp
|
|
Consequently, except where noted, the following restrictions apply when
|
|
.Nm chpass
|
|
is used with NIS:
|
|
.Bl -enum -offset indent
|
|
.It
|
|
.Pa Only the shell and GECOS information may be changed.
|
|
All other
|
|
fields are restricted, even when
|
|
.Nm chpass
|
|
is invoked by the super-user.
|
|
While support for
|
|
changing other fields could be added, this would lead to
|
|
compatibility problems with other NIS-capable systems.
|
|
Even though the super-user may supply data for other fields
|
|
while editing an entry, the extra information (other than the
|
|
password -- see below) will be silently discarded.
|
|
.Pp
|
|
Exception: the super-user on the NIS master server is permitted to
|
|
change any field.
|
|
.Pp
|
|
.It
|
|
.Pa Password authentication is required.
|
|
.Nm Chpass
|
|
will prompt for the user's NIS password before effecting
|
|
any changes. If the password is invalid, all changes will be
|
|
discarded.
|
|
.Pp
|
|
Exception: the super-user on the NIS master server is allowed to
|
|
submit changes without supplying a password. (The super-user may
|
|
choose to turn off this feature using the
|
|
.Fl o
|
|
flag, described below.)
|
|
.It
|
|
.Pa Adding new records to the local
|
|
.Pa password database is discouraged.
|
|
.Nm Chpass
|
|
will allow the administrator to add new records to the
|
|
local password database while NIS is enabled, but this can lead to
|
|
some confusion since the new records are appended to the end of
|
|
the master password file, usually after the special NIS '+' entries.
|
|
The administrator should use
|
|
.Xr vipw 8
|
|
to modify the local password
|
|
file when NIS is running.
|
|
.Pp
|
|
The super-user on the NIS master server is permitted to add new records
|
|
to the NIS password maps, provided the
|
|
.Xr rpc.yppasswdd 8
|
|
server has been started with the
|
|
.Fl a
|
|
flag to permitted additions (it refuses them by default).
|
|
.Nm Chpass
|
|
tries to update the local password database by default; to update the
|
|
NIS maps instead, invoke chpass with the
|
|
.Fl y
|
|
flag.
|
|
.It
|
|
.Pa Password changes are not permitted.
|
|
Users should use
|
|
.Xr passwd 1
|
|
or
|
|
.Xr yppasswd 1
|
|
to change their NIS passwords. The super-user is allowed to specify
|
|
a new password (even though the ``Password:'' field does not show
|
|
up in the editor template, the super-user may add it back by hand),
|
|
but even the super-user must supply the user's original password
|
|
otherwise
|
|
.Xr rpc.yppasswdd 8
|
|
will refuse to update the NIS maps.
|
|
.Pp
|
|
Exception: the super-user on the NIS master server is permitted to
|
|
change a user's NIS password with
|
|
.Nm chpass .
|
|
.El
|
|
.Pp
|
|
There are also a few extra option flags that are available when
|
|
.Nm chpass
|
|
is compiled with NIS support:
|
|
.Bl -tag -width flag
|
|
.It Fl l
|
|
The
|
|
.Fl l
|
|
flag forces
|
|
.Nm chpass
|
|
to modify the local copy of a user's password
|
|
information in the even that a user exists in both
|
|
the local and NIS databases.
|
|
.It Fl y
|
|
This flag has the opposite effect of
|
|
.Fl l .
|
|
This flag is largely redundant since
|
|
.Nm chpass
|
|
operates on NIS entries by default if NIS is enabled.
|
|
.It Fl d Ar domain
|
|
Specify a particular NIS domain.
|
|
.Nm Chpass
|
|
uses the system domain name by default, as set by the
|
|
.Xr domainname 1
|
|
command. The
|
|
.Fl d
|
|
option can be used to override a default, or to specify a domain
|
|
when the system domain name is not set.
|
|
.It Fl h Ar host
|
|
Specify the name or address of an NIS server to query. Normally,
|
|
.Nm chpass
|
|
will communicate with the NIS master host specified in the
|
|
.Pa master.passwd
|
|
or
|
|
.Pa passwd
|
|
maps. On hosts that have not been configured as NIS clients, there is
|
|
no way for the program to determine this information unless the user
|
|
provides the hostname of a server. Note that the specified hostname need
|
|
not be that of the NIS master server; the name of any server, master or
|
|
slave, in a given NIS domain will do.
|
|
.Pp
|
|
When using the
|
|
.Fl d
|
|
option, the hostname defaults to ``localhost.'' The
|
|
.Fl h
|
|
option can be used in conjunction with the
|
|
.Fl d
|
|
option, in which case the user-specified hostname will override
|
|
the default.
|
|
.Pp
|
|
.It Fl o
|
|
Force the use of RPC-based updates when communicating with
|
|
.Xr rpc.yppasswdd 8
|
|
(``old-mode'').
|
|
When invoked by the super-user on the NIS master server,
|
|
.Nm chpass
|
|
allows unrestricted changes to the NIS passwd maps using dedicated,
|
|
non-RPC-based mechanism (in this case, a UNIX domain socket). The
|
|
.Fl o
|
|
flag can be used to force
|
|
.Nm chpass
|
|
to use the standard update mechanism instead. This option is provided
|
|
mainly for testing purposes.
|
|
.El
|
|
.Pp
|
|
.Sh FILES
|
|
.Bl -tag -width /etc/master.passwd -compact
|
|
.It Pa /etc/master.passwd
|
|
The user database
|
|
.It Pa /etc/passwd
|
|
A Version 7 format password file
|
|
.It Pa /etc/chpass.XXXXXX
|
|
Temporary copy of the password file
|
|
.It Pa /etc/shells
|
|
The list of approved shells
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr finger 1 ,
|
|
.Xr login 1 ,
|
|
.Xr passwd 1 ,
|
|
.Xr getusershell 3 ,
|
|
.Xr passwd 5 ,
|
|
.Xr pwd_mkdb 8 ,
|
|
.Xr vipw 8
|
|
.Rs
|
|
.%A Robert Morris
|
|
and
|
|
.%A Ken Thompson
|
|
.%T "UNIX Password security"
|
|
.Re
|
|
.Sh NOTES
|
|
The
|
|
.Xr chfn 1 ,
|
|
.Xr chsh 1 ,
|
|
.Xr ypchpass 1 ,
|
|
.Xr ypchfn 1
|
|
and
|
|
.Xr ypchsh 1
|
|
commands are really only links to
|
|
.Nm chpass .
|
|
.Sh BUGS
|
|
User information should (and eventually will) be stored elsewhere.
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
command appeared in
|
|
.Bx 4.3 Reno .
|