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5b3771f13c
for authentication to PAM. This meens that WHEELSU-type logic can now be effected in the pam.conf "su" configuration stack. While here, clean up the mess that the code had assumed over years of hacking by folks using different styles. ANSIfy. There is more policy in here that can be handed over to PAM. This will be revisited.
218 lines
6.0 KiB
Groff
218 lines
6.0 KiB
Groff
.\" Copyright (c) 1988, 1990, 1993, 1994
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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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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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.\" @(#)su.1 8.2 (Berkeley) 4/18/94
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.\" $FreeBSD$
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.\"
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.Dd April 18, 1994
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.Dt SU 1
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.Os
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.Sh NAME
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.Nm su
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.Nd substitute user identity
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.Sh SYNOPSIS
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.Nm
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.Op Fl
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.Op Fl flm
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.Op Fl c Ar class
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.Op Ar login Op Ar args
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.Sh DESCRIPTION
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.Nm Su
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requests appropriate user credentials via PAM
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and switches to that user ID
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(the default user is the superuser).
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A shell is then executed.
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.Pp
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PAM is used to set all policy.
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.Pp
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By default, the environment is unmodified with the exception of
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.Ev USER ,
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.Ev HOME ,
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and
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.Ev SHELL .
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.Ev HOME
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and
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.Ev SHELL
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are set to the target login's default values.
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.Ev USER
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is set to the target login, unless the target login has a user ID of 0,
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in which case it is unmodified.
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The invoked shell is the one belonging to the target login.
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This is the traditional behavior of
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.Nm .
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Resource limits and session priority applicable to the original user's
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login class (See
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.Xr login.conf 5 )
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are also normally retained unless the target login as a user ID of 0.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl f
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If the invoked shell is
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.Xr csh 1 ,
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this option prevents it from reading the
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.Dq Pa .cshrc
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file.
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.It Fl l
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Simulate a full login.
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The environment is discarded except for
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.Ev HOME ,
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.Ev SHELL ,
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.Ev PATH ,
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.Ev TERM ,
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and
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.Ev USER .
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.Ev HOME
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and
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.Ev SHELL
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are modified as above.
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.Ev USER
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is set to the target login.
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.Ev PATH
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is set to
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.Dq Pa /bin:/usr/bin .
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.Ev TERM
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is imported from your current environment.
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Environment variables may be set or overridden from the login class
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capabilities database according to the class of the target login.
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The invoked shell is the target login's, and
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.Nm
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will change directory to the target login's home directory.
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Resource limits and session priority are modified to that for the
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target account's login class.
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.It Fl
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(no letter) The same as
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.Fl l .
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.It Fl m
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Leave the environment unmodified.
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The invoked shell is your login shell, and no directory changes are made.
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As a security precaution, if the target user's shell is a non-standard
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shell (as defined by
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.Xr getusershell 3 )
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and the caller's real uid is
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non-zero,
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.Nm
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will fail.
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.It Fl c Ar class
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Use the settings of the specified login class.
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Only allowed for the super-user.
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.El
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.Pp
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The
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.Fl l
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(or
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.Fl
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)
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and
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.Fl m
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options are mutually exclusive; the last one specified
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overrides any previous ones.
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.Pp
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If the optional
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.Ar args
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are provided on the command line, they are passed to the login shell of
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the target login.
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.Pp
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By default (unless the prompt is reset by a startup file) the super-user
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prompt is set to
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.Dq Sy \&#
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to remind one of its awesome power.
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.Sh FILES
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.Bl -tag -width /etc/pam.conf -compact
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.It Pa /etc/pam.conf
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.Nm
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is configured with PAM support; it uses
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.Pa /etc/pam.conf
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entries with service name
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.Dq su
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.El
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.Sh SEE ALSO
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.Xr csh 1 ,
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.Xr sh 1 ,
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.Xr group 5 ,
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.Xr login.conf 5 ,
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.Xr passwd 5 ,
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.Xr environ 7 ,
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.Xr pam 8
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.Sh ENVIRONMENT
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Environment variables used by
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.Nm :
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.Bl -tag -width HOME
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.It Ev HOME
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Default home directory of real user ID unless modified as
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specified above.
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.It Ev PATH
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Default search path of real user ID unless modified as specified above.
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.It Ev TERM
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Provides terminal type which may be retained for the substituted
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user ID.
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.It Ev USER
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The user ID is always the effective ID (the target user ID) after an
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.Nm
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unless the user ID is 0 (root).
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.El
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.Sh EXAMPLES
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.Bl -tag -width 5n -compact
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.It Li "su man -c catman"
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Runs the command
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.Li catman
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as user
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.Li man .
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You will be asked for man's password unless your real UID is 0.
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.It Li "su man -c 'catman /usr/share/man /usr/local/man /usr/X11R6/man'"
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Same as above, but the target command constitutes of more than a
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single word and hence is quoted for use with the
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.Fl c
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option being passed to the shell. (Most shells expect the argument to
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.Fl c
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to be a single word).
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.It Li "su -c staff man -c 'catman /usr/share/man /usr/local/man /usr/X11R6/man'"
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Same as above, but the target command is run with the resource limits of
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the login class
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.Dq staff .
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Note: in this example, the first
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.Fl c
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option applies to
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.Nm
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while the second is an argument to the shell being invoked.
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.It Li "su -l foo"
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Simulate a login for user foo.
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.It Li "su - foo"
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Same as above.
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.It Li "su - "
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Simulate a login for root.
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.El
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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 v1 .
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