1.\" Copyright (c) 2002 Networks Associates Technology, Inc. 2.\" All rights reserved. 3.\" 4.\" This software was developed for the FreeBSD Project by Chris Costello 5.\" at Safeport Network Services and Network Associates Laboratories, the 6.\" Security Research Division of Network Associates, Inc. under 7.\" DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 8.\" DARPA CHATS research program. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.Dd July 25, 2015 32.Dt MAC_SEEOTHERUIDS 4 33.Os 34.Sh NAME 35.Nm mac_seeotheruids 36.Nd "simple policy controlling whether users see other users" 37.Sh SYNOPSIS 38To compile the 39policy into your kernel, place the following lines in your kernel 40configuration file: 41.Bd -ragged -offset indent 42.Cd "options MAC" 43.Cd "options MAC_SEEOTHERUIDS" 44.Ed 45.Pp 46Alternately, to load the module at boot time, place the following line 47in your kernel configuration file: 48.Bd -ragged -offset indent 49.Cd "options MAC" 50.Ed 51.Pp 52and in 53.Xr loader.conf 5 : 54.Bd -literal -offset indent 55mac_seeotheruids_load="YES" 56.Ed 57.Sh DESCRIPTION 58The 59.Nm 60policy module, when enabled, denies users to see processes or sockets owned 61by other users. 62.Pp 63To enable 64.Nm , 65set the sysctl OID 66.Va security.mac.seeotheruids.enabled 67to 1. 68To permit superuser awareness of other credentials by virtue of privilege, 69set the sysctl OID 70.Va security.mac.seeotheruids.suser_privileged 71to 1. 72.Pp 73To allow users to see processes and sockets owned by the same primary group, 74set the sysctl OID 75.Va security.mac.seeotheruids.primarygroup_enabled 76to 1. 77.Pp 78To allow processes with a specific group ID to be exempt from the policy, 79set the sysctl OID 80.Va security.mac.seeotheruids.specificgid_enabled 81to 1, and 82.Va security.mac.seeotheruids.specificgid 83to the group ID to be exempted. 84.Ss Label Format 85No labels are defined for 86.Nm . 87.Sh SEE ALSO 88.Xr mac 4 , 89.Xr mac_biba 4 , 90.Xr mac_bsdextended 4 , 91.Xr mac_ifoff 4 , 92.Xr mac_lomac 4 , 93.Xr mac_mls 4 , 94.Xr mac_none 4 , 95.Xr mac_partition 4 , 96.Xr mac_portacl 4 , 97.Xr mac_test 4 , 98.Xr mac 9 99.Sh HISTORY 100The 101.Nm 102policy module first appeared in 103.Fx 5.0 104and was developed by the 105.Tn TrustedBSD 106Project. 107.Sh AUTHORS 108This software was contributed to the 109.Fx 110Project by Network Associates Labs, 111the Security Research Division of Network Associates 112Inc. 113under DARPA/SPAWAR contract N66001-01-C-8035 114.Pq Dq CBOSS , 115as part of the DARPA CHATS research program. 116.Sh BUGS 117While the MAC Framework design is intended to support the containment of 118the root user, not all attack channels are currently protected by entry 119point checks. 120As such, MAC Framework policies should not be relied on, in isolation, 121to protect against a malicious privileged user. 122