freebsd-dev/sys/security/mac/mac_system.c
Pawel Jakub Dawidek 63dba32b76 Reimplement sysctls handling by MAC framework.
Now I believe it is done in the right way.

Removed some XXMAC cases, we now assume 'high' integrity level for all
sysctls, except those with CTLFLAG_ANYBODY flag set. No more magic.

Reviewed by:	rwatson
Approved by:	rwatson, scottl (mentor)
Tested with:	LINT (compilation), mac_biba(4) (functionality)
2004-02-22 12:31:44 +00:00

268 lines
5.4 KiB
C

/*-
* Copyright (c) 2002, 2003 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project in part by Network
* Associates Laboratories, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
* as part of the DARPA CHATS research program.
*
* 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_mac.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/mac.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/sysctl.h>
#include <sys/mac_policy.h>
#include <security/mac/mac_internal.h>
static int mac_enforce_kld = 1;
SYSCTL_INT(_security_mac, OID_AUTO, enforce_kld, CTLFLAG_RW,
&mac_enforce_kld, 0, "Enforce MAC policy on kld operations");
TUNABLE_INT("security.mac.enforce_kld", &mac_enforce_kld);
static int mac_enforce_system = 1;
SYSCTL_INT(_security_mac, OID_AUTO, enforce_system, CTLFLAG_RW,
&mac_enforce_system, 0, "Enforce MAC policy on system operations");
TUNABLE_INT("security.mac.enforce_system", &mac_enforce_system);
int
mac_check_kenv_dump(struct ucred *cred)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_kenv_dump, cred);
return (error);
}
int
mac_check_kenv_get(struct ucred *cred, char *name)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_kenv_get, cred, name);
return (error);
}
int
mac_check_kenv_set(struct ucred *cred, char *name, char *value)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_kenv_set, cred, name, value);
return (error);
}
int
mac_check_kenv_unset(struct ucred *cred, char *name)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_kenv_unset, cred, name);
return (error);
}
int
mac_check_kld_load(struct ucred *cred, struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_kld_load");
if (!mac_enforce_kld)
return (0);
MAC_CHECK(check_kld_load, cred, vp, vp->v_label);
return (error);
}
int
mac_check_kld_stat(struct ucred *cred)
{
int error;
if (!mac_enforce_kld)
return (0);
MAC_CHECK(check_kld_stat, cred);
return (error);
}
int
mac_check_kld_unload(struct ucred *cred)
{
int error;
if (!mac_enforce_kld)
return (0);
MAC_CHECK(check_kld_unload, cred);
return (error);
}
int
mac_check_sysarch_ioperm(struct ucred *cred)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_sysarch_ioperm, cred);
return (error);
}
int
mac_check_system_acct(struct ucred *cred, struct vnode *vp)
{
int error;
if (vp != NULL) {
ASSERT_VOP_LOCKED(vp, "mac_check_system_acct");
}
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_system_acct, cred, vp,
vp != NULL ? vp->v_label : NULL);
return (error);
}
int
mac_check_system_nfsd(struct ucred *cred)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_system_nfsd, cred);
return (error);
}
int
mac_check_system_reboot(struct ucred *cred, int howto)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_system_reboot, cred, howto);
return (error);
}
int
mac_check_system_settime(struct ucred *cred)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_system_settime, cred);
return (error);
}
int
mac_check_system_swapon(struct ucred *cred, struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_system_swapon");
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_system_swapon, cred, vp, vp->v_label);
return (error);
}
int
mac_check_system_swapoff(struct ucred *cred, struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_system_swapoff");
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_system_swapoff, cred, vp, vp->v_label);
return (error);
}
int
mac_check_system_sysctl(struct ucred *cred, struct sysctl_oid *oidp, void *arg1,
int arg2, struct sysctl_req *req)
{
int error;
/*
* XXXMAC: We're very much like to assert the SYSCTL_LOCK here,
* but since it's not exported from kern_sysctl.c, we can't.
*/
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_system_sysctl, cred, oidp, arg1, arg2, req);
return (error);
}