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82f9bc9ea8
Remove references to cr_canseeothergids(9) and cr_canseeotheruids(9). Defer to cr_bsd_visible() for controlling sysctl(8) variables. Reviewed by: bcr, mhorne MFC after: 2 weeks Sponsored by: Kumacom SAS Differential Revision: https://reviews.freebsd.org/D40636
84 lines
2.7 KiB
Groff
84 lines
2.7 KiB
Groff
.\"
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.\" Copyright (c) 2006 Ceri Davies <ceri@FreeBSD.org>
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.\" Copyright (c) 2023 Olivier Certner <olce.freebsd@certner.fr>
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.\"
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.\" 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd August 18, 2023
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.Dt CR_CANSEE 9
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.Os
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.Sh NAME
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.Nm cr_cansee
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.Nd "determine visibility of objects given their user credentials"
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.Sh SYNOPSIS
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.In sys/proc.h
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.Ft int
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.Fn cr_cansee "struct ucred *u1" "struct ucred *u2"
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.Sh DESCRIPTION
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This function determines if a subject with credential
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.Fa u1
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can see a subject or object associated to credential
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.Fa u2 .
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.Pp
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Specific types of subjects may need to submit to additional or different
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restrictions.
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As an example, for processes, see
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.Xr p_cansee 9 ,
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which calls this function.
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.Pp
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The implementation relies on
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.Xr cr_bsd_visible 9
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and consequently the
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.Xr sysctl 8
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variables referenced in its manual page influence the result.
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.Sh RETURN VALUES
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This function returns zero if the subject with credential
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.Fa u1
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can
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.Dq see
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the subject or object with credential
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.Fa u2 ,
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or
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.Er ESRCH
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otherwise.
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er ESRCH
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The subject with credential
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.Fa u1
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has been jailed and the subject or object with credential
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.Fa u2
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does not belong to the same jail or one of its sub-jails, as determined by
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.Xr prison_check 9 .
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.It Bq Er ESRCH
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The MAC subsystem denied visibility.
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.It Bq Er ESRCH
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.Xr cr_bsd_visible 9
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denied visibility according to the BSD security policies in force.
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.El
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.Sh SEE ALSO
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.Xr prison_check 9 ,
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.Xr mac 9 ,
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.Xr cr_bsd_visible 9 ,
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.Xr p_cansee 9
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