8b099b734b
MAC policies to perform object life cycle operations and access control checks. Submitted by: Dandekar Hrishikesh <rishi_dandekar at sbcglobal dot net> Obtained from: TrustedBSD Project Sponsored by: DARPA, SPAWAR, McAfee Research
174 lines
4.3 KiB
C
174 lines
4.3 KiB
C
/*-
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* Copyright (c) 2003-2004 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project in part by Network
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* Associates Laboratories, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
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* as part of the DARPA CHATS research program.
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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 AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/mac.h>
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#include <sys/sbuf.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/file.h>
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#include <sys/namei.h>
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#include <sys/sysctl.h>
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#include <sys/shm.h>
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#include <sys/mac_policy.h>
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#include <security/mac/mac_internal.h>
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static int mac_enforce_sysv_shm = 1;
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SYSCTL_INT(_security_mac, OID_AUTO, enforce_sysv_shm, CTLFLAG_RW,
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&mac_enforce_sysv_shm, 0,
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"Enforce MAC policy on System V IPC shared memory");
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TUNABLE_INT("security.mac.enforce_sysv", &mac_enforce_sysv_shm);
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#ifdef MAC_DEBUG
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static unsigned int nmacipcshms;
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SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipc_shms, CTLFLAG_RD,
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&nmacipcshms, 0, "number of sysv ipc shm identifiers inuse");
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#endif
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static struct label *
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mac_sysv_shm_label_alloc(void)
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{
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struct label *label;
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label = mac_labelzone_alloc(M_WAITOK);
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MAC_PERFORM(init_sysv_shm_label, label);
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MAC_DEBUG_COUNTER_INC(&nmacipcshms);
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return (label);
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}
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void
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mac_init_sysv_shm(struct shmid_kernel *shmsegptr)
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{
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shmsegptr->label = mac_sysv_shm_label_alloc();
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}
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static void
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mac_sysv_shm_label_free(struct label *label)
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{
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MAC_PERFORM(destroy_sysv_shm_label, label);
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mac_labelzone_free(label);
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MAC_DEBUG_COUNTER_DEC(&nmacipcshms);
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}
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void
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mac_destroy_sysv_shm(struct shmid_kernel *shmsegptr)
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{
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mac_sysv_shm_label_free(shmsegptr->label);
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shmsegptr->label = NULL;
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}
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void
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mac_create_sysv_shm(struct ucred *cred, struct shmid_kernel *shmsegptr)
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{
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MAC_PERFORM(create_sysv_shm, cred, shmsegptr, shmsegptr->label);
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}
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void
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mac_cleanup_sysv_shm(struct shmid_kernel *shmsegptr)
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{
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MAC_PERFORM(cleanup_sysv_shm, shmsegptr->label);
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}
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int
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mac_check_sysv_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
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int shmflg)
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{
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int error;
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if (!mac_enforce_sysv_shm)
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return (0);
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MAC_CHECK(check_sysv_shmat, cred, shmsegptr, shmsegptr->label,
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shmflg);
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return(error);
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}
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int
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mac_check_sysv_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
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int cmd)
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{
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int error;
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if (!mac_enforce_sysv_shm)
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return (0);
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MAC_CHECK(check_sysv_shmctl, cred, shmsegptr, shmsegptr->label,
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cmd);
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return(error);
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}
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int
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mac_check_sysv_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr)
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{
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int error;
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if (!mac_enforce_sysv_shm)
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return (0);
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MAC_CHECK(check_sysv_shmdt, cred, shmsegptr, shmsegptr->label);
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return(error);
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}
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int
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mac_check_sysv_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
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int shmflg)
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{
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int error;
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if (!mac_enforce_sysv_shm)
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return (0);
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MAC_CHECK(check_sysv_shmget, cred, shmsegptr, shmsegptr->label,
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shmflg);
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return(error);
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}
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