[apple/xnu.git] / security / mac_vfs.c

/*
 * Copyright (c) 2007 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*-
 * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
 * Copyright (c) 2001 Ilmar S. Habibulin
 * Copyright (c) 2001, 2002, 2003, 2004 Networks Associates Technology, Inc.
 * Copyright (c) 2005 SPARTA, Inc.
 *
 * This software was developed by Robert Watson and Ilmar Habibulin for the
 * TrustedBSD Project.
 *
 * 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/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/kauth.h>

#include <sys/file_internal.h>
#include <sys/imgact.h>
#include <sys/namei.h>
#include <sys/mount_internal.h>
#include <sys/pipe.h>
#include <sys/posix_sem.h>
#include <sys/posix_shm.h>
#include <sys/uio_internal.h>
#include <sys/vnode_internal.h>

#include <miscfs/devfs/devfsdefs.h>
#include <miscfs/devfs/fdesc.h>

#include <security/mac_internal.h>

/* convert {R,W,X}_OK values to V{READ,WRITE,EXEC} */
#define ACCESS_MODE_TO_VNODE_MASK(m)    (m << 6)

static struct label *
mac_devfsdirent_label_alloc(void)
{
        struct label *label;

        label = mac_labelzone_alloc(MAC_WAITOK);
        if (label == NULL)
                return (NULL);
        MAC_PERFORM(devfs_label_init, label);
        return (label);
}

void
mac_devfs_label_init(struct devnode *de)
{

        de->dn_label = mac_devfsdirent_label_alloc();
}

static struct label *
mac_mount_label_alloc(void)
{
        struct label *label;

        label = mac_labelzone_alloc(MAC_WAITOK);
        if (label == NULL)
                return (NULL);
        MAC_PERFORM(mount_label_init, label);
        return (label);
}

void
mac_mount_label_init(struct mount *mp)
{

        mp->mnt_mntlabel = mac_mount_label_alloc();
}

struct label *
mac_vnode_label_alloc(void)
{
        struct label *label;

        label = mac_labelzone_alloc(MAC_WAITOK);
        if (label == NULL)
                return (NULL);
        MAC_PERFORM(vnode_label_init, label);
        return (label);
}

void
mac_vnode_label_init(vnode_t vp)
{
        vp->v_label = mac_vnode_label_alloc();
}

int
mac_vnode_label_init_needed(vnode_t vp)
{
        return (mac_label_vnodes != 0 && vp->v_label == NULL);
}

/* 
 * vnode labels are allocated at the same time as vnodes, but vnodes are never
 * freed.  Instead, we want to remove any sensitive information before putting
 * them on the free list for reuse.
*/
void
mac_vnode_label_recycle(vnode_t vp)
{

        MAC_PERFORM(vnode_label_recycle, vp->v_label);
}

static void
mac_devfs_label_free(struct label *label)
{
        MAC_PERFORM(devfs_label_destroy, label);
        mac_labelzone_free(label);
}

void
mac_devfs_label_destroy(struct devnode *de)
{
        if (de->dn_label != NULL) {
                mac_devfs_label_free(de->dn_label);
                de->dn_label = NULL;
        }
}

static void
mac_mount_label_free(struct label *label)
{

        MAC_PERFORM(mount_label_destroy, label);
        mac_labelzone_free(label);
}

void
mac_mount_label_destroy(struct mount *mp)
{
        if (mp->mnt_mntlabel != NULL) {
                mac_mount_label_free(mp->mnt_mntlabel);
                mp->mnt_mntlabel = NULL;
        }
}

void
mac_vnode_label_free(struct label *label)
{
        MAC_PERFORM(vnode_label_destroy, label);
        mac_labelzone_free(label);
}

#ifndef __APPLE__
void
mac_vnode_label_destroy(struct vnode *vp)
{
        if (vp->v_label != NULL) {
                mac_vnode_label_free(vp->v_label);
                vp->v_label = NULL;
        }
}
#endif

void
mac_vnode_label_copy(struct label *src, struct label *dest)
{
        if (src == NULL) {
                MAC_PERFORM(vnode_label_init, dest);
        } else {
                MAC_PERFORM(vnode_label_copy, src, dest);
        }
}

int
mac_vnode_label_externalize_audit(struct vnode *vp, struct mac *mac)
{
        int error;

        /* It is assumed that any necessary vnode locking is done on entry */
        error = MAC_EXTERNALIZE_AUDIT(vnode, vp->v_label,
            mac->m_string, mac->m_buflen);

        return (error);
}

int
mac_vnode_label_externalize(struct label *label, char *elements,
    char *outbuf, size_t outbuflen, int flags __unused)
{
        int error;

        error = MAC_EXTERNALIZE(vnode, label, elements, outbuf, outbuflen);

        return (error);
}

int
mac_vnode_label_internalize(struct label *label, char *string)
{
        int error;

        error = MAC_INTERNALIZE(vnode, label, string);

        return (error);
}

int
mac_mount_label_internalize(struct label *label, char *string)
{
        int error;

        error = MAC_INTERNALIZE(mount, label, string);

        return (error);
}

int
mac_mount_label_externalize(struct label *label, char *elements,
    char *outbuf, size_t outbuflen)
{
        int error;

        error = MAC_EXTERNALIZE(mount, label, elements, outbuf, outbuflen);

        return (error);
}

void
mac_devfs_label_copy(struct label *src, struct label *dest)
{
        if (!mac_device_enforce)
                return;

        MAC_PERFORM(devfs_label_copy, src, dest);
}

void
mac_devfs_label_update(struct mount *mp, struct devnode *de,
    struct vnode *vp)
{

        if (!mac_device_enforce)
                return;

        MAC_PERFORM(devfs_label_update, mp, de, de->dn_label, vp,
            vp->v_label);
}

int
mac_vnode_label_associate(struct mount *mp, struct vnode *vp, vfs_context_t ctx)
{
        struct devnode *dnp;
        struct fdescnode *fnp;
        int error = 0;

        if (!mac_vnode_enforce)
                return (error);

        /* XXX: should not inspect v_tag in kernel! */
        switch (vp->v_tag) {
        case VT_DEVFS:
                dnp = VTODN(vp);
                mac_vnode_label_associate_devfs(mp, dnp, vp);
                break;
        case VT_FDESC:
                fnp = VTOFDESC(vp);
                error = mac_vnode_label_associate_fdesc(mp, fnp, vp, ctx);
                break;
        default:
                error = mac_vnode_label_associate_extattr(mp, vp);
                break;
        }

        return (error);
}

void
mac_vnode_label_associate_devfs(struct mount *mp, struct devnode *de,
    struct vnode *vp)
{
        if (!mac_device_enforce)
                return;

        MAC_PERFORM(vnode_label_associate_devfs,
            mp, mp ? mp->mnt_mntlabel : NULL,
            de, de->dn_label,
            vp, vp->v_label);
}

int
mac_vnode_label_associate_extattr(struct mount *mp, struct vnode *vp)
{
        int error;

        MAC_CHECK(vnode_label_associate_extattr, mp, mp->mnt_mntlabel, vp,
            vp->v_label);

        return (error);
}

void
mac_vnode_label_associate_singlelabel(struct mount *mp, struct vnode *vp)
{

        if (!mac_vnode_enforce || !mac_label_vnodes)
                return;

        MAC_PERFORM(vnode_label_associate_singlelabel, mp,
            mp ? mp->mnt_mntlabel : NULL, vp, vp->v_label);
}

int
mac_vnode_notify_create(vfs_context_t ctx, struct mount *mp,
    struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_notify_create, cred, mp, mp->mnt_mntlabel,
            dvp, dvp->v_label, vp, vp->v_label, cnp);

        return (error);
}

void
mac_vnode_notify_rename(vfs_context_t ctx, struct vnode *vp,
    struct vnode *dvp, struct componentname *cnp)
{
        kauth_cred_t cred;

        if (!mac_vnode_enforce ||
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return;

        cred = vfs_context_ucred(ctx);
        MAC_PERFORM(vnode_notify_rename, cred, vp, vp->v_label,
            dvp, dvp->v_label, cnp);
}

void
mac_vnode_notify_open(vfs_context_t ctx, struct vnode *vp, int acc_flags)
{
        kauth_cred_t cred;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return;

        cred = vfs_context_ucred(ctx);
        MAC_PERFORM(vnode_notify_open, cred, vp, vp->v_label, acc_flags);
}

void
mac_vnode_notify_link(vfs_context_t ctx, struct vnode *vp,
                      struct vnode *dvp, struct componentname *cnp)
{
        kauth_cred_t cred;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return;

        cred = vfs_context_ucred(ctx);
        MAC_PERFORM(vnode_notify_link, cred, dvp, dvp->v_label, vp, vp->v_label, cnp);
}

/*
 * Extended attribute 'name' was updated via
 * vn_setxattr() or vn_removexattr().  Allow the
 * policy to update the vnode label.
 */
void
mac_vnode_label_update_extattr(struct mount *mp, struct vnode *vp,
    const char *name)
{
        int error = 0;

        if (!mac_vnode_enforce || !mac_label_vnodes)
                return;

        MAC_PERFORM(vnode_label_update_extattr, mp, mp->mnt_mntlabel, vp,
                    vp->v_label, name);
        if (error == 0)
                return;

        vnode_lock(vp);
        vnode_relabel(vp);
        vnode_unlock(vp);
        return;
}

static int
mac_vnode_label_store(vfs_context_t ctx, struct vnode *vp,
    struct label *intlabel)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || !mac_label_vnodes ||
            !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return 0;

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_label_store, cred, vp, vp->v_label, intlabel);

        return (error);
}

void
mac_cred_label_update_execve(vfs_context_t ctx, kauth_cred_t new, struct vnode *vp, off_t offset,
        struct vnode *scriptvp, struct label *scriptvnodelabel, struct label *execl, u_int *csflags,
        void *macextensions, int *disjoint, int *labelupdateerror)
{
        kauth_cred_t cred;
        *disjoint = 0;
        int error;
        posix_cred_t pcred = posix_cred_get(new);

        if (!mac_proc_enforce && !mac_vnode_enforce)
                return;

        /* mark the new cred to indicate "matching" includes the label */
        pcred->cr_flags |= CRF_MAC_ENFORCE;

        cred = vfs_context_ucred(ctx);

        /*
         * NB: Cannot use MAC_CHECK macro because we need a sequence point after
         *     calling exec_spawnattr_getmacpolicyinfo() and before passing the
         *     spawnattrlen as an argument to the hook.
         */
        {
                struct mac_policy_conf *mpc;
                u_int i;

                error = 0;
                for (i = 0; i< mac_policy_list.staticmax; i++) {
                        mpc = mac_policy_list.entries[i].mpc;
                        if (mpc == NULL)
                                continue;

                        mpo_cred_label_update_execve_t *hook = mpc->mpc_ops->mpo_cred_label_update_execve;
                        if (hook == NULL)
                                continue;

                        size_t spawnattrlen = 0;
                        void *spawnattr = exec_spawnattr_getmacpolicyinfo(macextensions, mpc->mpc_name, &spawnattrlen);

                        error = mac_error_select(hook(cred, new, vfs_context_proc(ctx), vp, offset, scriptvp,
                                                 vp->v_label, scriptvnodelabel, execl, csflags, spawnattr, spawnattrlen, disjoint),
                                                 error);
                }
                if (mac_policy_list_conditional_busy() != 0) { 
                        for (; i <= mac_policy_list.maxindex; i++) {
                                mpc = mac_policy_list.entries[i].mpc;
                                if (mpc == NULL)
                                        continue;

                                mpo_cred_label_update_execve_t *hook = mpc->mpc_ops->mpo_cred_label_update_execve;
                                if (hook == NULL)
                                        continue;

                                size_t spawnattrlen = 0;
                                void *spawnattr = exec_spawnattr_getmacpolicyinfo(macextensions, mpc->mpc_name, &spawnattrlen);

                                error = mac_error_select(hook(cred, new, vfs_context_proc(ctx), vp, offset, scriptvp,
                                                     vp->v_label, scriptvnodelabel, execl, csflags, spawnattr, spawnattrlen, disjoint),
                                                         error);
                        }
                        mac_policy_list_unbusy();
                }
        }
        *labelupdateerror = error;
}

int
mac_cred_check_label_update_execve(vfs_context_t ctx, struct vnode *vp, off_t offset,
        struct vnode *scriptvp, struct label *scriptvnodelabel, struct label *execlabel,
        struct proc *p, void *macextensions)
{
        kauth_cred_t cred;
        int result = 0;

        if (!mac_proc_enforce && !mac_vnode_enforce)
                return result;

        cred = vfs_context_ucred(ctx);

        /*
         * NB: Cannot use MAC_BOOLEAN macro because we need a sequence point after
         *     calling exec_spawnattr_getmacpolicyinfo() and before passing the
         *     spawnattrlen as an argument to the hook.
         */
        {
                struct mac_policy_conf *mpc;
                u_int i;

                for (i = 0; i< mac_policy_list.staticmax; i++) {
                        mpc = mac_policy_list.entries[i].mpc;
                        if (mpc == NULL)
                                continue;

                        mpo_cred_check_label_update_execve_t *hook = mpc->mpc_ops->mpo_cred_check_label_update_execve;
                        if (hook == NULL)
                                continue;

                        size_t spawnattrlen = 0;
                        void *spawnattr = exec_spawnattr_getmacpolicyinfo(macextensions, mpc->mpc_name, &spawnattrlen);

                        result = result || hook(cred, vp, offset, scriptvp, vp->v_label, scriptvnodelabel, execlabel, p, spawnattr, spawnattrlen);
                }
                if (mac_policy_list_conditional_busy() != 0) { 
                        for (; i <= mac_policy_list.maxindex; i++) {
                                mpc = mac_policy_list.entries[i].mpc;
                                if (mpc == NULL)
                                        continue;

                                mpo_cred_check_label_update_execve_t *hook = mpc->mpc_ops->mpo_cred_check_label_update_execve;
                                if (hook == NULL)
                                        continue;

                                size_t spawnattrlen = 0;
                                void *spawnattr = exec_spawnattr_getmacpolicyinfo(macextensions, mpc->mpc_name, &spawnattrlen);

                                result = result || hook(cred, vp, offset, scriptvp, vp->v_label, scriptvnodelabel, execlabel, p, spawnattr, spawnattrlen);
                        }
                        mac_policy_list_unbusy();
                }
        }

        return (result);
}

int
mac_vnode_check_access(vfs_context_t ctx, struct vnode *vp,
    int acc_mode)
{
        kauth_cred_t cred;
        int error;
        int mask;

        if (!mac_vnode_enforce ||
            !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return 0;

        cred = vfs_context_ucred(ctx);
        /* Convert {R,W,X}_OK values to V{READ,WRITE,EXEC} for entry points */
        mask = ACCESS_MODE_TO_VNODE_MASK(acc_mode);
        MAC_CHECK(vnode_check_access, cred, vp, vp->v_label, mask);
        return (error);
 }

int
mac_vnode_check_chdir(vfs_context_t ctx, struct vnode *dvp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
            !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_chdir, cred, dvp, dvp->v_label);
        return (error);
}

int
mac_vnode_check_chroot(vfs_context_t ctx, struct vnode *dvp,
    struct componentname *cnp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_chroot, cred, dvp, dvp->v_label, cnp);
        return (error);
}

int
mac_vnode_check_create(vfs_context_t ctx, struct vnode *dvp,
    struct componentname *cnp, struct vnode_attr *vap)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_create, cred, dvp, dvp->v_label, cnp, vap);
        return (error);
}

int
mac_vnode_check_unlink(vfs_context_t ctx, struct vnode *dvp, struct vnode *vp,
    struct componentname *cnp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_unlink, cred, dvp, dvp->v_label, vp,
            vp->v_label, cnp);
        return (error);
}
#if 0
int
mac_vnode_check_deleteacl(vfs_context_t ctx, struct vnode *vp,
    acl_type_t type)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_deleteacl, cred, vp, vp->v_label, type);
        return (error);
}
#endif

int
mac_vnode_check_deleteextattr(vfs_context_t ctx, struct vnode *vp,
    const char *name)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_deleteextattr, cred, vp, vp->v_label, name);
        return (error);
}
int
mac_vnode_check_exchangedata(vfs_context_t ctx,
    struct vnode *v1, struct vnode *v2)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_exchangedata, cred, v1, v1->v_label, 
            v2, v2->v_label);

        return (error);
}

#if 0
int
mac_vnode_check_getacl(vfs_context_t ctx, struct vnode *vp, acl_type_t type)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_getacl, cred, vp, vp->v_label, type);
        return (error);
}
#endif

int
mac_vnode_check_getattrlist(vfs_context_t ctx, struct vnode *vp,
    struct attrlist *alist)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_getattrlist, cred, vp, vp->v_label, alist);

        /* Falsify results instead of returning error? */
        return (error);
}

int
mac_vnode_check_exec(vfs_context_t ctx, struct vnode *vp,
    struct image_params *imgp)
{
        kauth_cred_t cred;
        int error = 0;

        if (!mac_vnode_enforce || !mac_proc_enforce)
                return (0);

        cred = vfs_context_ucred(ctx);

        /*
         * NB: Cannot use MAC_CHECK macro because we need a sequence point after
         *     calling exec_spawnattr_getmacpolicyinfo() and before passing the
         *     spawnattrlen as an argument to the hook.
         */
        {
                struct mac_policy_conf *mpc;
                u_int i;

                for (i = 0; i< mac_policy_list.staticmax; i++) {
                        mpc = mac_policy_list.entries[i].mpc;
                        if (mpc == NULL)
                                continue;

                        mpo_vnode_check_exec_t *hook = mpc->mpc_ops->mpo_vnode_check_exec;
                        if (hook == NULL)
                                continue;

                        size_t spawnattrlen = 0;
                        void *spawnattr = exec_spawnattr_getmacpolicyinfo(imgp->ip_px_smpx, mpc->mpc_name, &spawnattrlen);

                        error = mac_error_select(
                                        hook(cred,
                                             vp, imgp->ip_scriptvp, vp->v_label, imgp->ip_scriptlabelp,
                                             imgp->ip_execlabelp, &imgp->ip_ndp->ni_cnd, &imgp->ip_csflags,
                                             spawnattr, spawnattrlen), error);
                }
                if (mac_policy_list_conditional_busy() != 0) { 
                        for (; i <= mac_policy_list.maxindex; i++) {
                                mpc = mac_policy_list.entries[i].mpc;
                                if (mpc == NULL)
                                        continue;

                                mpo_vnode_check_exec_t *hook = mpc->mpc_ops->mpo_vnode_check_exec;
                                if (hook == NULL)
                                        continue;

                                size_t spawnattrlen = 0;
                                void *spawnattr = exec_spawnattr_getmacpolicyinfo(imgp->ip_px_smpx, mpc->mpc_name, &spawnattrlen);

                                error = mac_error_select(
                                                hook(cred,
                                                     vp, imgp->ip_scriptvp, vp->v_label, imgp->ip_scriptlabelp,
                                                     imgp->ip_execlabelp, &imgp->ip_ndp->ni_cnd, &imgp->ip_csflags,
                                                     spawnattr, spawnattrlen), error);
                        }
                        mac_policy_list_unbusy();
                }
        }

        return (error);
}

int
mac_vnode_check_fsgetpath(vfs_context_t ctx, struct vnode *vp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce ||
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_fsgetpath, cred, vp, vp->v_label);
        return (error);
}

int
mac_vnode_check_signature(struct vnode *vp, off_t macho_offset,
                          unsigned char *sha1,
                          const void *signature, size_t size,
                          int flags, int *is_platform_binary)
{
        int error;
        
        if (!mac_vnode_enforce || !mac_proc_enforce)
                return (0);
        
        MAC_CHECK(vnode_check_signature, vp, vp->v_label, macho_offset, sha1, 
                                                          signature, size, 
                                                          flags, is_platform_binary);
        return (error);
}

#if 0
int
mac_vnode_check_getacl(vfs_context_t ctx, struct vnode *vp, acl_type_t type)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_getacl, cred, vp, vp->v_label, type);
        return (error);
}
#endif

int
mac_vnode_check_getextattr(vfs_context_t ctx, struct vnode *vp,
    const char *name, struct uio *uio)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_getextattr, cred, vp, vp->v_label,
            name, uio);
        return (error);
}

int
mac_vnode_check_ioctl(vfs_context_t ctx, struct vnode *vp, u_int cmd)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_ioctl, cred, vp, vp->v_label, cmd);
        return (error);
}

int
mac_vnode_check_kqfilter(vfs_context_t ctx, kauth_cred_t file_cred,
    struct knote *kn, struct vnode *vp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_kqfilter, cred, file_cred, kn, vp,
            vp->v_label);

        return (error);
}

int
mac_vnode_check_link(vfs_context_t ctx, struct vnode *dvp,
    struct vnode *vp, struct componentname *cnp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_link, cred, dvp, dvp->v_label, vp,
            vp->v_label, cnp);
        return (error);
}

int
mac_vnode_check_listextattr(vfs_context_t ctx, struct vnode *vp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_listextattr, cred, vp, vp->v_label);
        return (error);
}

int
mac_vnode_check_lookup(vfs_context_t ctx, struct vnode *dvp,
    struct componentname *cnp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_lookup, cred, dvp, dvp->v_label, cnp);
        return (error);
}

int
mac_vnode_check_open(vfs_context_t ctx, struct vnode *vp, int acc_mode)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_open, cred, vp, vp->v_label, acc_mode);
        return (error);
}

int
mac_vnode_check_read(vfs_context_t ctx, struct ucred *file_cred,
    struct vnode *vp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_read, cred, file_cred, vp,
            vp->v_label);

        return (error);
}

int
mac_vnode_check_readdir(vfs_context_t ctx, struct vnode *dvp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_readdir, cred, dvp, dvp->v_label);
        return (error);
}

int
mac_vnode_check_readlink(vfs_context_t ctx, struct vnode *vp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_readlink, cred, vp, vp->v_label);
        return (error);
}

int
mac_vnode_check_label_update(vfs_context_t ctx, struct vnode *vp,
    struct label *newlabel)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_label_update, cred, vp, vp->v_label, newlabel);

        return (error);
}

int
mac_vnode_check_rename(vfs_context_t ctx, struct vnode *dvp,
    struct vnode *vp, struct componentname *cnp, struct vnode *tdvp,
    struct vnode *tvp, struct componentname *tcnp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce ||
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);

        MAC_CHECK(vnode_check_rename_from, cred, dvp, dvp->v_label, vp,
            vp->v_label, cnp);
        if (error)
                return (error);

        MAC_CHECK(vnode_check_rename_to, cred, tdvp, tdvp->v_label, tvp,
            tvp != NULL ? tvp->v_label : NULL, dvp == tdvp, tcnp);
        if (error)
                return (error);

        MAC_CHECK(vnode_check_rename, cred, dvp, dvp->v_label, vp,
            vp->v_label, cnp, tdvp, tdvp->v_label, tvp,
            tvp != NULL ? tvp->v_label : NULL, tcnp);
        return (error);
}

int
mac_vnode_check_revoke(vfs_context_t ctx, struct vnode *vp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_revoke, cred, vp, vp->v_label);
        return (error);
}

int
mac_vnode_check_searchfs(vfs_context_t ctx, struct vnode *vp, struct attrlist *alist)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_searchfs, cred, vp, vp->v_label, alist);
        return (error);
}

int
mac_vnode_check_select(vfs_context_t ctx, struct vnode *vp, int which)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_select, cred, vp, vp->v_label, which);
        return (error);
}

#if 0
int
mac_vnode_check_setacl(vfs_context_t ctx, struct vnode *vp, acl_type_t type,
    struct acl *acl)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_setacl, cred, vp, vp->v_label, type, acl);
        return (error);
}
#endif

int
mac_vnode_check_setattrlist(vfs_context_t ctx, struct vnode *vp,
    struct attrlist *alist)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_setattrlist, cred, vp, vp->v_label, alist);
        return (error);
}

int
mac_vnode_check_setextattr(vfs_context_t ctx, struct vnode *vp,
    const char *name, struct uio *uio)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_setextattr, cred, vp, vp->v_label,
            name, uio);
        return (error);
}

int
mac_vnode_check_setflags(vfs_context_t ctx, struct vnode *vp, u_long flags)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_setflags, cred, vp, vp->v_label, flags);
        return (error);
}

int
mac_vnode_check_setmode(vfs_context_t ctx, struct vnode *vp, mode_t mode)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_setmode, cred, vp, vp->v_label, mode);
        return (error);
}

int
mac_vnode_check_setowner(vfs_context_t ctx, struct vnode *vp, uid_t uid,
    gid_t gid)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_setowner, cred, vp, vp->v_label, uid, gid);
        return (error);
}

int
mac_vnode_check_setutimes(vfs_context_t ctx, struct vnode *vp,
    struct timespec atime, struct timespec mtime)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_setutimes, cred, vp, vp->v_label, atime,
            mtime);
        return (error);
}

int
mac_vnode_check_stat(vfs_context_t ctx, struct ucred *file_cred,
    struct vnode *vp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_stat, cred, file_cred, vp,
            vp->v_label);
        return (error);
}

int
mac_vnode_check_truncate(vfs_context_t ctx, struct ucred *file_cred,
    struct vnode *vp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_truncate, cred, file_cred, vp,
            vp->v_label);

        return (error);
}

int
mac_vnode_check_write(vfs_context_t ctx, struct ucred *file_cred,
    struct vnode *vp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_write, cred, file_cred, vp, vp->v_label);

        return (error);
}

int
mac_vnode_check_uipc_bind(vfs_context_t ctx, struct vnode *dvp,
    struct componentname *cnp, struct vnode_attr *vap)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_uipc_bind, cred, dvp, dvp->v_label, cnp, vap);
        return (error);
}

int
mac_vnode_check_uipc_connect(vfs_context_t ctx, struct vnode *vp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(vnode_check_uipc_connect, cred, vp, vp->v_label);
        return (error);
}

void
mac_vnode_label_update(vfs_context_t ctx, struct vnode *vp, struct label *newlabel)
{
        kauth_cred_t cred = vfs_context_ucred(ctx);
        struct label *tmpl = NULL;

        if (vp->v_label == NULL)
                tmpl = mac_vnode_label_alloc();

        vnode_lock(vp);

        /* recheck after lock */
        if (vp->v_label == NULL) {
                vp->v_label = tmpl;
                tmpl = NULL;
        }

        MAC_PERFORM(vnode_label_update, cred, vp, vp->v_label, newlabel);
        vnode_unlock(vp);

        if (tmpl != NULL)
                mac_vnode_label_free(tmpl);
}

int
mac_vnode_find_sigs(struct proc *p, struct vnode *vp, off_t offset)
{
        int error;

        if (!mac_vnode_enforce || !mac_proc_enforce)
                return (0);

        MAC_CHECK(vnode_find_sigs, p, vp, offset, vp->v_label);

        return (error);
}

void
mac_mount_label_associate(vfs_context_t ctx, struct mount *mp)
{
        kauth_cred_t cred = vfs_context_ucred(ctx);

        /* XXX: eventually this logic may be handled by the policy? */

        /* We desire MULTILABEL for the root filesystem. */
        if ((mp->mnt_flag & MNT_ROOTFS) && 
            (strcmp(mp->mnt_vfsstat.f_fstypename, "hfs") == 0))
                mp->mnt_flag |= MNT_MULTILABEL;

        /* MULTILABEL on DEVFS. */
        if (strcmp(mp->mnt_vfsstat.f_fstypename, "devfs") == 0)
                mp->mnt_flag |= MNT_MULTILABEL;

        /* MULTILABEL on FDESC pseudo-filesystem. */
        if (strcmp(mp->mnt_vfsstat.f_fstypename, "fdesc") == 0)
                mp->mnt_flag |= MNT_MULTILABEL;

        /* MULTILABEL on all NFS filesystems. */
        if (strcmp(mp->mnt_vfsstat.f_fstypename, "nfs") == 0)
                mp->mnt_flag |= MNT_MULTILABEL;

        /* MULTILABEL on all AFP filesystems. */
        if (strcmp(mp->mnt_vfsstat.f_fstypename, "afpfs") == 0)
                mp->mnt_flag |= MNT_MULTILABEL;

        if (mp->mnt_vtable != NULL) {
                /* Any filesystem that supports native XATTRs. */
                if ((mp->mnt_vtable->vfc_vfsflags & VFC_VFSNATIVEXATTR))
                        mp->mnt_flag |= MNT_MULTILABEL;

                /* Filesystem does not support multilabel. */
                if ((mp->mnt_vtable->vfc_vfsflags & VFC_VFSNOMACLABEL) &&
                    (mp->mnt_flag & MNT_MULTILABEL))
                        mp->mnt_flag &= ~MNT_MULTILABEL;
        }

        MAC_PERFORM(mount_label_associate, cred, mp, mp->mnt_mntlabel);
#if DEBUG
        printf("MAC Framework enabling %s support: %s -> %s (%s)\n",
                mp->mnt_flag & MNT_MULTILABEL ? "multilabel" : "singlelabel", 
                mp->mnt_vfsstat.f_mntfromname,
                mp->mnt_vfsstat.f_mntonname,
                mp->mnt_vfsstat.f_fstypename);
#endif
}

int
mac_mount_check_mount(vfs_context_t ctx, struct vnode *vp,
    struct componentname *cnp, const char *vfc_name)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(mount_check_mount, cred, vp, vp->v_label, cnp, vfc_name);

        return (error);
}

int
mac_mount_check_remount(vfs_context_t ctx, struct mount *mp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(mount_check_remount, cred, mp, mp->mnt_mntlabel);

        return (error);
}

int
mac_mount_check_umount(vfs_context_t ctx, struct mount *mp)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(mount_check_umount, cred, mp, mp->mnt_mntlabel);

        return (error);
}

int
mac_mount_check_getattr(vfs_context_t ctx, struct mount *mp, 
    struct vfs_attr *vfa)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(mount_check_getattr, cred, mp, mp->mnt_mntlabel, vfa);
        return (error);
}

int
mac_mount_check_setattr(vfs_context_t ctx, struct mount *mp, 
    struct vfs_attr *vfa)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(mount_check_setattr, cred, mp, mp->mnt_mntlabel, vfa);
        return (error);
}

int
mac_mount_check_stat(vfs_context_t ctx, struct mount *mount)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(mount_check_stat, cred, mount, mount->mnt_mntlabel);

        return (error);
}

int
mac_mount_check_label_update(vfs_context_t ctx, struct mount *mount)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(mount_check_label_update, cred, mount, mount->mnt_mntlabel);

        return (error);
}

int
mac_mount_check_fsctl(vfs_context_t ctx, struct mount *mp, u_int cmd)
{
        kauth_cred_t cred;
        int error;

        if (!mac_vnode_enforce || 
                !mac_context_check_enforce(ctx, MAC_VNODE_ENFORCE))
                return (0);

        cred = vfs_context_ucred(ctx);
        MAC_CHECK(mount_check_fsctl, cred, mp, mp->mnt_mntlabel, cmd);

        return (error);
}

void
mac_devfs_label_associate_device(dev_t dev, struct devnode *de,
    const char *fullpath)
{
        if (!mac_device_enforce)
                return;

        MAC_PERFORM(devfs_label_associate_device, dev, de, de->dn_label,
            fullpath);
}

void
mac_devfs_label_associate_directory(const char *dirname, int dirnamelen,
    struct devnode *de, const char *fullpath)
{
        if (!mac_device_enforce)
                return;

        MAC_PERFORM(devfs_label_associate_directory, dirname, dirnamelen, de,
            de->dn_label, fullpath);
}

int
vn_setlabel(struct vnode *vp, struct label *intlabel, vfs_context_t context)
{
        int error;

        if (!mac_vnode_enforce || !mac_label_vnodes)
                return (0);

        if (vp->v_mount == NULL) {
                printf("vn_setlabel: null v_mount\n");
                if (vp->v_type != VNON)
                        printf("vn_setlabel: null v_mount with non-VNON\n");
                return (EBADF);
        }

        if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
                return (ENOTSUP);

        /*
         * Multi-phase commit.  First check the policies to confirm the
         * change is OK.  Then commit via the filesystem.  Finally,
         * update the actual vnode label.  Question: maybe the filesystem
         * should update the vnode at the end as part of VNOP_SETLABEL()?
         */
        error = mac_vnode_check_label_update(context, vp, intlabel);
        if (error)
                return (error);

        error = VNOP_SETLABEL(vp, intlabel, context);
        if (error == ENOTSUP) {
                error = mac_vnode_label_store(context, vp,
                                                   intlabel);
                if (error) {
                        printf("%s: mac_vnode_label_store failed %d\n",
                                __func__, error);
                        return (error);
                }
                mac_vnode_label_update(context, vp, intlabel);
        } else
        if (error) {
                printf("vn_setlabel: vop setlabel failed %d\n", error);
                return (error);
        }

        return (0);
}

int
mac_vnode_label_associate_fdesc(struct mount *mp, struct fdescnode *fnp,
    struct vnode *vp, vfs_context_t ctx)
{
        struct fileproc *fp;
#if CONFIG_MACF_SOCKET_SUBSET
        struct socket *so;
#endif
        struct pipe *cpipe;
        struct vnode *fvp;
        struct proc *p;
        int error;

        error = 0;

        /*
         * If no backing file, let the policy choose which label to use.
         */
        if (fnp->fd_fd == -1) {
                MAC_PERFORM(vnode_label_associate_file, vfs_context_ucred(ctx),
                    mp, mp->mnt_mntlabel, NULL, NULL, vp, vp->v_label);
                return (0);
        }

        p = vfs_context_proc(ctx);
        error = fp_lookup(p, fnp->fd_fd, &fp, 0);
        if (error)
                return (error);

        if (fp->f_fglob == NULL) {
                error = EBADF;
                goto out;
        }

        switch (FILEGLOB_DTYPE(fp->f_fglob)) {
        case DTYPE_VNODE:
                fvp = (struct vnode *)fp->f_fglob->fg_data;
                if ((error = vnode_getwithref(fvp)))
                        goto out;
                MAC_PERFORM(vnode_label_copy, fvp->v_label, vp->v_label);
                (void)vnode_put(fvp);
                break;
#if CONFIG_MACF_SOCKET_SUBSET
        case DTYPE_SOCKET:
                so = (struct socket *)fp->f_fglob->fg_data;
                socket_lock(so, 1);
                MAC_PERFORM(vnode_label_associate_socket,
                            vfs_context_ucred(ctx), (socket_t)so, so->so_label,
                    vp, vp->v_label);
                socket_unlock(so, 1);
                break;
#endif
        case DTYPE_PSXSHM:
                pshm_label_associate(fp, vp, ctx);
                break;
        case DTYPE_PSXSEM:
                psem_label_associate(fp, vp, ctx);
                break;
        case DTYPE_PIPE:
                cpipe = (struct pipe *)fp->f_fglob->fg_data;
                /* kern/sys_pipe.c:pipe_select() suggests this test. */
                if (cpipe == (struct pipe *)-1) {
                        error = EINVAL;
                        goto out;
                }
                PIPE_LOCK(cpipe);
                MAC_PERFORM(vnode_label_associate_pipe, vfs_context_ucred(ctx),
                    cpipe, cpipe->pipe_label, vp, vp->v_label);
                PIPE_UNLOCK(cpipe);
                break;
        case DTYPE_KQUEUE:
        case DTYPE_FSEVENTS:
        default:
                MAC_PERFORM(vnode_label_associate_file, vfs_context_ucred(ctx),
                    mp, mp->mnt_mntlabel, fp->f_fglob, fp->f_fglob->fg_label,
                    vp, vp->v_label);
                break;
        }
out:
        fp_drop(p, fnp->fd_fd, fp, 0);
        return (error);
}