2006-11-19 13:35:03 +00:00
|
|
|
.\"
|
|
|
|
|
.\" Copyright (c) 2006 Ceri Davies <ceri@FreeBSD.org>
|
|
|
|
|
.\"
|
|
|
|
|
.\" 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.
|
|
|
|
|
.\"
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``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 DEVELOPERS 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.
|
|
|
|
|
.\"
|
|
|
|
|
.\" $FreeBSD$
|
|
|
|
|
.\"
|
|
|
|
|
.Dd November 19, 2006
|
|
|
|
|
.Dt CR_CANSEE 9
|
2010-04-14 19:08:06 +00:00
|
|
|
.Os
|
2006-11-19 13:35:03 +00:00
|
|
|
.Sh NAME
|
|
|
|
|
.Nm cr_cansee
|
|
|
|
|
.Nd "determine visibility of objects given their user credentials"
|
|
|
|
|
.Sh SYNOPSIS
|
|
|
|
|
.In sys/param.h
|
|
|
|
|
.In sys/systm.h
|
|
|
|
|
.In sys/ucred.h
|
|
|
|
|
.Ft int
|
|
|
|
|
.Fn cr_cansee "struct ucred *u1" "struct ucred *u2"
|
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
This function determines the visibility of objects in the
|
|
|
|
|
kernel based on the real user IDs and group IDs in the credentials
|
|
|
|
|
.Fa u1
|
|
|
|
|
and
|
|
|
|
|
.Fa u2
|
|
|
|
|
associated with them.
|
|
|
|
|
.Pp
|
|
|
|
|
The visibility of objects is influenced by the
|
|
|
|
|
.Xr sysctl 8
|
|
|
|
|
variables
|
|
|
|
|
.Va security.bsd.see_other_gids
|
|
|
|
|
and
|
|
|
|
|
.Va security.bsd.see_other_uids ,
|
|
|
|
|
as per the description in
|
|
|
|
|
.Xr cr_seeothergids 9
|
|
|
|
|
and
|
|
|
|
|
.Xr cr_seeotheruids 9
|
|
|
|
|
respectively.
|
|
|
|
|
.Sh RETURN VALUES
|
|
|
|
|
This function returns zero if the object with credential
|
|
|
|
|
.Fa u1
|
|
|
|
|
can
|
|
|
|
|
.Dq see
|
|
|
|
|
the object with credential
|
|
|
|
|
.Fa u2 ,
|
|
|
|
|
or
|
|
|
|
|
.Er ESRCH
|
|
|
|
|
otherwise.
|
|
|
|
|
.Sh ERRORS
|
|
|
|
|
.Bl -tag -width Er
|
|
|
|
|
.It Bq Er ESRCH
|
|
|
|
|
The object with credential
|
|
|
|
|
.Fa u1
|
|
|
|
|
cannot
|
|
|
|
|
.Dq see
|
|
|
|
|
the object with credential
|
|
|
|
|
.Fa u2 .
|
|
|
|
|
.It Bq Er ESRCH
|
|
|
|
|
The object with credential
|
|
|
|
|
.Fa u1
|
|
|
|
|
has been jailed and the object with credential
|
|
|
|
|
.Fa u2
|
|
|
|
|
does not belong to the same jail as
|
|
|
|
|
.Fa u1 .
|
|
|
|
|
.It Bq Er ESRCH
|
|
|
|
|
The MAC subsystem denied visibility.
|
|
|
|
|
.El
|
|
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr cr_seeothergids 9 ,
|
|
|
|
|
.Xr cr_seeotheruids 9 ,
|
|
|
|
|
.Xr mac 9 ,
|
|
|
|
|
.Xr p_cansee 9
|
