9b6dd12e5d
and the new setmode and setowner fileops in FreeBSD 9.0: - Add new MAC Framework entry point mac_posixshm_check_create() to allow MAC policies to authorise shared memory use. Provide a stub policy and test policy templates. - Add missing Biba and MLS implementations of mac_posixshm_check_setmode() and mac_posixshm_check_setowner(). - Add 'accmode' argument to mac_posixshm_check_open() -- unlike the mac_posixsem_check_open() entry point it was modeled on, the access mode is required as shared memory access can be read-only as well as writable; this isn't true of POSIX semaphores. - Implement full range of POSIX shared memory entry points for Biba and MLS. Sponsored by: Google Inc. Obtained from: TrustedBSD Project Approved by: re (kib)
231 lines
6.1 KiB
C
231 lines
6.1 KiB
C
/*-
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* Copyright (c) 2003-2006 SPARTA, Inc.
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* Copyright (c) 2009-2011 Robert N. M. Watson
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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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* This software was developed at the University of Cambridge Computer
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* Laboratory with support from a grant from Google, Inc.
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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_kdtrace.h"
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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/mman.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/sdt.h>
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#include <sys/systm.h>
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#include <sys/sysctl.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_posixshm_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_POLICY_PERFORM(posixshm_init_label, label);
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return (label);
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}
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void
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mac_posixshm_init(struct shmfd *shmfd)
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{
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if (mac_labeled & MPC_OBJECT_POSIXSHM)
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shmfd->shm_label = mac_posixshm_label_alloc();
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else
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shmfd->shm_label = NULL;
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}
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static void
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mac_posixshm_label_free(struct label *label)
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{
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MAC_POLICY_PERFORM_NOSLEEP(posixshm_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_posixshm_destroy(struct shmfd *shmfd)
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{
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if (shmfd->shm_label != NULL) {
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mac_posixshm_label_free(shmfd->shm_label);
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shmfd->shm_label = NULL;
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}
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}
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void
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mac_posixshm_create(struct ucred *cred, struct shmfd *shmfd)
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{
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MAC_POLICY_PERFORM_NOSLEEP(posixshm_create, cred, shmfd,
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shmfd->shm_label);
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}
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MAC_CHECK_PROBE_DEFINE2(posixshm_check_create, "struct ucred *",
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"const char *");
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int
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mac_posixshm_check_create(struct ucred *cred, const char *path)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(posixshm_check_create, cred, path);
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MAC_CHECK_PROBE2(posixshm_check_create, error, cred, path);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE4(posixshm_check_mmap, "struct ucred *",
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"struct shmfd *", "int", "int");
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int
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mac_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd, int prot,
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int flags)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(posixshm_check_mmap, cred, shmfd,
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shmfd->shm_label, prot, flags);
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MAC_CHECK_PROBE4(posixshm_check_mmap, error, cred, shmfd, prot,
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flags);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE3(posixshm_check_open, "struct ucred *",
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"struct shmfd *", "accmode_t accmode");
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int
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mac_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd,
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accmode_t accmode)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(posixshm_check_open, cred, shmfd,
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shmfd->shm_label, accmode);
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MAC_CHECK_PROBE3(posixshm_check_open, error, cred, shmfd, accmode);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE3(posixshm_check_stat, "struct ucred *",
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"struct ucred *", "struct shmfd *");
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int
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mac_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred,
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struct shmfd *shmfd)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(posixshm_check_stat, active_cred, file_cred,
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shmfd, shmfd->shm_label);
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MAC_CHECK_PROBE3(posixshm_check_stat, error, active_cred, file_cred,
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shmfd);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE3(posixshm_check_truncate, "struct ucred *",
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"struct ucred *", "struct shmfd *");
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int
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mac_posixshm_check_truncate(struct ucred *active_cred, struct ucred *file_cred,
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struct shmfd *shmfd)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(posixshm_check_truncate, active_cred,
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file_cred, shmfd, shmfd->shm_label);
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MAC_CHECK_PROBE3(posixshm_check_truncate, error, active_cred,
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file_cred, shmfd);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE2(posixshm_check_unlink, "struct ucred *",
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"struct shmfd *");
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int
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mac_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(posixshm_check_unlink, cred, shmfd,
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shmfd->shm_label);
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MAC_CHECK_PROBE2(posixshm_check_unlink, error, cred, shmfd);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE3(posixshm_check_setmode, "struct ucred *",
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"struct shmfd *", "mode_t");
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int
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mac_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd, mode_t mode)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setmode, cred, shmfd,
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shmfd->shm_label, mode);
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MAC_CHECK_PROBE3(posixshm_check_setmode, error, cred, shmfd, mode);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE4(posixshm_check_setowner, "struct ucred *",
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"struct shmfd *", "uid_t", "gid_t");
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int
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mac_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd, uid_t uid,
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gid_t gid)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setowner, cred, shmfd,
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shmfd->shm_label, uid, gid);
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MAC_CHECK_PROBE4(posixshm_check_setowner, error, cred, shmfd,
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uid, gid);
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return (error);
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}
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