diff --git a/share/man/man4/mac_priority.4 b/share/man/man4/mac_priority.4 index 6dfb937d1596..868d027d5233 100644 --- a/share/man/man4/mac_priority.4 +++ b/share/man/man4/mac_priority.4 @@ -1,125 +1,128 @@ .\" Copyright (c) 2021 Florian Walpen .\" .\" 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 AUTHORS AND CONTRIBUTORS ``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 AUTHORS OR CONTRIBUTORS 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. .\" -.Dd December 7, 2021 +.Dd December 14, 2021 .Dt MAC_PRIORITY 4 .Os .Sh NAME .Nm mac_priority .Nd "policy for scheduling privileges of non-root users" .Sh SYNOPSIS To compile the mac_priority policy into your kernel, place the following lines in your kernel configuration file: .Bd -ragged -offset indent .Cd "options MAC" .Cd "options MAC_PRIORITY" .Ed .Pp Alternately, to load the mac_priority policy module at boot time, place the following line in your kernel configuration file: .Bd -ragged -offset indent .Cd "options MAC" .Ed .Pp and in .Xr loader.conf 5 : .Bd -literal -offset indent mac_priority_load="YES" .Ed .Sh DESCRIPTION The .Nm policy grants scheduling privileges based on .Xr group 5 membership. Users or processes in the group .Sq realtime (gid 47) are allowed to run threads and processes with realtime scheduling priority. Users or processes in the group .Sq idletime (gid 48) are allowed to run threads and processes with idle scheduling priority. .Pp With the .Nm realtime policy active, privileged users may use the .Xr rtprio 1 utility to start processes with realtime priority. Privileged applications can promote threads and processes to realtime priority through the .Xr rtprio 2 system calls. .Pp When the idletime policy is active, privileged users may use the .Xr idprio 1 utility to start processes with idle priority. Privileged applications can demote threads and processes to idle priority through the .Xr rtprio 2 system calls. .Ss Privileges Granted -The kernel privileges granted to any process running -with the corresponding group gid is: -.Bl -tag -width ".Dv PRIV_SCHED_RTPRIO" -offset indent +The realtime policy grants the following kernel privileges to any process +running with the realtime group id: +.Bl -inset -offset indent -compact .It Dv PRIV_SCHED_RTPRIO -If it is a member of the realtime group. +.It Dv PRIV_SCHED_SETPOLICY +.El +.Pp +The kernel privilege granted by the idletime policy is: +.Bl -inset -offset indent -compact .It Dv PRIV_SCHED_IDPRIO -If it is a member of the idletime group. .El .Ss Runtime Configuration The following .Xr sysctl 8 MIBs are available for fine-tuning this MAC policy. All .Xr sysctl 8 variables can also be set as .Xr loader 8 tunables in .Xr loader.conf 5 . .Bl -tag -width indent .It Va security.mac.priority.realtime Enable the realtime policy. (Default: 1). .It Va security.mac.priority.realtime_gid The numeric gid of the realtime group. (Default: 47). .It Va security.mac.priority.idletime Enable the idletime policy. (Default: 1). .It Va security.mac.priority.idletime_gid The numeric gid of the idletime group. (Default: 48). .El .Sh SEE ALSO .Xr idprio 1 , .Xr rtprio 1 , .Xr rtprio 2 , .Xr mac 4 .Sh HISTORY MAC first appeared in .Fx 5.0 and .Nm first appeared in .Fx 14.0 . diff --git a/sys/security/mac_priority/mac_priority.c b/sys/security/mac_priority/mac_priority.c index 5c4db72ca657..f460e5195cb9 100644 --- a/sys/security/mac_priority/mac_priority.c +++ b/sys/security/mac_priority/mac_priority.c @@ -1,83 +1,83 @@ /*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2021 Florian Walpen * * 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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. */ #include #include #include #include #include #include #include #include SYSCTL_DECL(_security_mac); static SYSCTL_NODE(_security_mac, OID_AUTO, priority, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "mac_priority policy controls"); static int realtime_enabled = 1; SYSCTL_INT(_security_mac_priority, OID_AUTO, realtime, CTLFLAG_RWTUN, &realtime_enabled, 0, "Enable realtime priority scheduling for group realtime_gid"); static int realtime_gid = GID_RT_PRIO; SYSCTL_INT(_security_mac_priority, OID_AUTO, realtime_gid, CTLFLAG_RWTUN, &realtime_gid, 0, "Group id of the realtime privilege group"); static int idletime_enabled = 1; SYSCTL_INT(_security_mac_priority, OID_AUTO, idletime, CTLFLAG_RWTUN, &idletime_enabled, 0, "Enable idle priority scheduling for group idletime_gid"); static int idletime_gid = GID_ID_PRIO; SYSCTL_INT(_security_mac_priority, OID_AUTO, idletime_gid, CTLFLAG_RWTUN, &idletime_gid, 0, "Group id of the idletime privilege group"); static int priority_priv_grant(struct ucred *cred, int priv) { - if (priv == PRIV_SCHED_RTPRIO && realtime_enabled && - groupmember(realtime_gid, cred)) + if ((priv == PRIV_SCHED_RTPRIO || priv == PRIV_SCHED_SETPOLICY) && + realtime_enabled && groupmember(realtime_gid, cred)) return (0); if (priv == PRIV_SCHED_IDPRIO && idletime_enabled && groupmember(idletime_gid, cred)) return (0); return (EPERM); } static struct mac_policy_ops priority_ops = { .mpo_priv_grant = priority_priv_grant, }; MAC_POLICY_SET(&priority_ops, mac_priority, "MAC/priority", MPC_LOADTIME_FLAG_UNLOADOK, NULL);