6356dba0b4
(1) Abstract interpreter vnode labeling in execve(2) and mac_execve(2)
so that the general exec code isn't aware of the details of
allocating, copying, and freeing labels, rather, simply passes in
a void pointer to start and stop functions that will be used by
the framework. This change will be MFC'd.
(2) Introduce a new flags field to the MAC_POLICY_SET(9) interface
allowing policies to declare which types of objects require label
allocation, initialization, and destruction, and define a set of
flags covering various supported object types (MPC_OBJECT_PROC,
MPC_OBJECT_VNODE, MPC_OBJECT_INPCB, ...). This change reduces the
overhead of compiling the MAC Framework into the kernel if policies
aren't loaded, or if policies require labels on only a small number
or even no object types. Each time a policy is loaded or unloaded,
we recalculate a mask of labeled object types across all policies
present in the system. Eliminate MAC_ALWAYS_LABEL_MBUF option as it
is no longer required.
MFC after: 1 week ((1) only)
Reviewed by: csjp
Obtained from: TrustedBSD Project
Sponsored by: Apple, Inc.
156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
/*-
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* Copyright (c) 2003-2004 Networks Associates Technology, Inc.
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* Copyright (c) 2006 SPARTA, 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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* This software was enhanced by SPARTA ISSO under SPAWAR contract
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* N66001-04-C-6019 ("SEFOS").
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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/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 <security/mac/mac_framework.h>
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#include <security/mac/mac_internal.h>
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#include <security/mac/mac_policy.h>
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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(sysvshm_init_label, label);
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return (label);
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}
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void
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mac_sysvshm_init(struct shmid_kernel *shmsegptr)
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{
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if (mac_labeled & MPC_OBJECT_SYSVSHM)
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shmsegptr->label = mac_sysv_shm_label_alloc();
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else
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shmsegptr->label = NULL;
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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(sysvshm_destroy_label, label);
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mac_labelzone_free(label);
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}
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void
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mac_sysvshm_destroy(struct shmid_kernel *shmsegptr)
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{
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if (shmsegptr->label != NULL) {
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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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}
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void
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mac_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr)
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{
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MAC_PERFORM(sysvshm_create, cred, shmsegptr, shmsegptr->label);
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}
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void
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mac_sysvshm_cleanup(struct shmid_kernel *shmsegptr)
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{
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MAC_PERFORM(sysvshm_cleanup, shmsegptr->label);
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}
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int
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mac_sysvshm_check_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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MAC_CHECK(sysvshm_check_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_sysvshm_check_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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MAC_CHECK(sysvshm_check_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_sysvshm_check_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr)
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{
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int error;
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MAC_CHECK(sysvshm_check_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_sysvshm_check_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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MAC_CHECK(sysvshm_check_shmget, cred, shmsegptr, shmsegptr->label,
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shmflg);
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return (error);
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}
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