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Up to [local] / src / usr.bin / doas

Implement command matching without execution. This just extends
functionality of the -C flag, so we are not introducing more garbage.

Input and okay from jmc@ (documentation) and tedu@ (everything).

.\" $OpenBSD: doas.1,v 1.11 2015/07/26 17:24:02 zhuk Exp $
.\"
.\"Copyright (c) 2015 Ted Unangst <tedu@openbsd.org>
.\"
.\"Permission to use, copy, modify, and distribute this software for any
.\"purpose with or without fee is hereby granted, provided that the above
.\"copyright notice and this permission notice appear in all copies.
.\"
.\"THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\"WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\"MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\"ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\"WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\"ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\"OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.Dd $Mdocdate: July 26 2015 $
.Dt DOAS 1
.Os
.Sh NAME
.Nm doas
.Nd execute commands as another user
.Sh SYNOPSIS
.Nm doas
.Op Fl s
.Op Fl C Ar config
.Op Fl u Ar user
.Ar command
.Op Ar args
.Sh DESCRIPTION
The
.Nm
utility executes the given command as another user.
The
.Ar command
argument is mandatory unless
.Fl C
or
.Fl s
is specified.
.Pp
The options are as follows:
.Bl -tag -width tenletters
.It Fl C Ar config
Parse and check the configuration file
.Ar config ,
then exit.
If
.Ar command
is supplied,
.Nm
will also perform command matching.
In the latter case
either
.Sq permit ,
.Sq permit nopass
or
.Sq deny
will be printed on standard output, depending on command
matching results.
No command is executed.
.It Fl s
Execute the shell from
.Ev SHELL
or
.Pa /etc/passwd .
.It Fl u Ar user
Execute the command as
.Ar user .
The default is root.
.El
.Sh EXIT STATUS
.Ex -std doas
It may fail for one of the following reasons:
.Pp
.Bl -bullet -compact
.It
The config file
.Pa /etc/doas.conf
could not be parsed.
.It
The user attempted to run a command which is not permitted.
.It
The password was incorrect.
.It
The actual program is absent or not executable.
.El
.Sh SEE ALSO
.Xr doas.conf 5
.Sh HISTORY
The
.Nm
command first appeared in
.Ox 5.8 .
.Sh AUTHORS
.An Ted Unangst Aq Mt tedu@openbsd.org