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WebSVN – general – Blame – //freebsd/mac_settime/trunk/src/mac_settime.4 – Rev 1119

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.\" Copyright 2005, Anatoli Klassen <anatoli@aksoft.net>
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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 AUTHORS 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 AUTHORS 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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.\"
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.Dd November 4, 2005
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.Dt MAC_SETTIME 4
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.Os
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.Sh NAME
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.Nm mac_settime
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.Nd "set system time policy"
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.Sh SYNOPSIS
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To load the set system time policy module at boot time,
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place the following line in your kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "options MAC"
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.Ed
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.Pp
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and place the following line in
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.Xr loader.conf 5 :
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.Pp
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.Dl "mac_settime_load=""YES"""
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.Pp
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then compile the module and copy it to your kernel modules directory
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(e.g. /boot/kernel or /boot/modules)
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.Sh DESCRIPTION
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The
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.Nm
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policy allows administrators to define who is allowed to set and adjust system time.
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.Pp
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In order to use the
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.Nm
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policy, the
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.Va kern.usersettime
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and
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.Va kern.useradjtime
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.Xr sysctl 8
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MIBs should be set to 1 to disable kernel security check.
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.Pp
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If system time has to be changed from jail, additionaly the
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.Va kern.jailsettime
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and
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.Va kern.jailadjtime
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.Xr sysctl 8
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MIBs should be set to 1.
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.Pp
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The following
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.Xr sysctl 8
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MIBs are available for fine-tuning the enforcement of this MAC policy.
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All
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.Xr sysctl 8
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variables, except
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.Va security.mac.portacl.rules ,
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can also be set as
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.Xr loader 8
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tunables in
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.Xr loader.conf 5 .
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.Bl -tag -width indent
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.It Va security.mac.settime.enabled
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Enforce the
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.Nm
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policy.
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(Default: 1).
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.Pp
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The MIB ca alse be set as
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.Xr loader 8
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tunables in
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.Xr loader.conf 5 .
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.It Va security.mac.settime.rules
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The set time access control list is specified as list of rules, separated by semicolon or new line.
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Rules are applied in given order, first match wins.
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If no match found time setting is denied.
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Each rule has the following format:
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.Pp
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.D1 Ar action Oo not Oc Ar idtype Ar idrange Oo not Oc Ar jailtype Ar jailidrange
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.Pp
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If some specification (id or jail) is omited it means "any".
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The
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.Li not
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keyword negates the match.
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Underscore can be used in place of space.
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.Bl -tag -width ".Ar action"
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.It Ar action
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Describes the result of the rule, either
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.Li allow
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or
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.Li deny .
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.It Ar idtype
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Describes the type of subject match to be performed.
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Either
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.Li uid
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for user ID matching, or
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.Li gid
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for group ID matching.
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.It Ar idrange : Bro Ar id | id Ns \&- Ns Ar id Ns Brc Ns Op , Ns Ar idrange
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The user or group IDs range (depending on
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.Ar idtype )
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allowed to set system time.
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.Bf -emphasis
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NOTE: User and group names are not valid; only the actual ID numbers
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may be used.
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.Ef
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.It Ar jailtype
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Describes which jail match to be performed.
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Either
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.Li nojail
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for the main system, or
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.Li jail
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for some jail, id range must be specified.
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.It Ar jailidrange : Bro Ar jailid | jailid Ns \&- Ns Ar jailid Ns Brc Ns Op , Ns Ar jailidrange
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IDs of jail allowed to set system time.
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.Pp
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.El
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.Bf -emphasis
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NOTE: MAC security policies may not override other security system policies
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by allowing accesses that they may deny, such as
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.Va kern.useradjtime /
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.Va kern.jailadjtime /
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.Va kern.usersettime /
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.Va kern.jailsettime .
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.Ef
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If the internal kernel security checks are not disabled, the
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.Nm
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entry will not function
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(i.e., even the specified user/group/jail may not be able to set system time).
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.Sh EXAMPLES
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To allow some user to set system time set
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.Va security.mac.settime.rules
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.Xr sysctl 8
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MIBs to:
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.Pp
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.Dl "allow uid 2000 nojail"
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.Pp
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To additionaly allow root to set time from several jails set the
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.Va security.mac.settime.rules
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to:
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.Pp
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.Dl "allow uid 2000 nojail"
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.Dl "allow uid 0 jail 4,5-9"
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.Pp
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If the MIB is set from /etc/sysctl.conf no spaces and new lines are allowed by /etc/rc.d/sysctl, so
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the last example can be written in another form:
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.Pp
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.Dl "allow_uid_2000_nojail;allow_uid_0_jail_4,5-9"
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.Pp
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.Sh SEE ALSO
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.Xr mac 3 ,
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.Xr ip 4 ,
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.Xr mac_biba 4 ,
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.Xr mac_bsdextended 4 ,
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.Xr mac_ifoff 4 ,
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.Xr mac_mls 4 ,
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.Xr mac_none 4 ,
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.Xr mac_partition 4 ,
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.Xr mac_seeotheruids 4 ,
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.Xr mac_portacl 4 ,
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.Xr mac_test 4 ,
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.Xr mac 9
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.Sh HISTORY
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MAC first appeared in
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.Fx 5.0