FreeBSD-5.3/sys/security/mac/mac_vfs.c
/*-
* Copyright (c) 1999-2002 Robert N. M. Watson
* Copyright (c) 2001 Ilmar S. Habibulin
* Copyright (c) 2001-2003 Networks Associates Technology, Inc.
* All rights reserved.
*
* 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/cdefs.h>
__FBSDID("$FreeBSD: src/sys/security/mac/mac_vfs.c,v 1.106 2004/06/16 09:47:20 phk Exp $");
#include "opt_mac.h"
#include "opt_devfs.h"
#include <sys/param.h>
#include <sys/condvar.h>
#include <sys/extattr.h>
#include <sys/imgact.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/mac.h>
#include <sys/proc.h>
#include <sys/sbuf.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <sys/namei.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <sys/mac_policy.h>
#include <fs/devfs/devfs.h>
#include <security/mac/mac_internal.h>
/*
* Warn about EA transactions only the first time they happen.
* Weak coherency, no locking.
*/
static int ea_warn_once = 0;
static int mac_enforce_fs = 1;
SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW,
&mac_enforce_fs, 0, "Enforce MAC policy on file system objects");
TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs);
#ifdef MAC_DEBUG
static int mac_debug_label_fallback = 0;
SYSCTL_INT(_security_mac_debug, OID_AUTO, label_fallback, CTLFLAG_RW,
&mac_debug_label_fallback, 0, "Filesystems should fall back to fs label"
"when label is corrupted.");
TUNABLE_INT("security.mac.debug_label_fallback",
&mac_debug_label_fallback);
static unsigned int nmacmounts, nmacvnodes, nmacdevfsdirents;
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mounts, CTLFLAG_RD,
&nmacmounts, 0, "number of mounts in use");
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, vnodes, CTLFLAG_RD,
&nmacvnodes, 0, "number of vnodes in use");
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, devfsdirents, CTLFLAG_RD,
&nmacdevfsdirents, 0, "number of devfs dirents inuse");
#endif
static int mac_setlabel_vnode_extattr(struct ucred *cred,
struct vnode *vp, struct label *intlabel);
static struct label *
mac_devfsdirent_label_alloc(void)
{
struct label *label;
label = mac_labelzone_alloc(M_WAITOK);
MAC_PERFORM(init_devfsdirent_label, label);
MAC_DEBUG_COUNTER_INC(&nmacdevfsdirents);
return (label);
}
void
mac_init_devfsdirent(struct devfs_dirent *de)
{
de->de_label = mac_devfsdirent_label_alloc();
}
static struct label *
mac_mount_label_alloc(void)
{
struct label *label;
label = mac_labelzone_alloc(M_WAITOK);
MAC_PERFORM(init_mount_label, label);
MAC_DEBUG_COUNTER_INC(&nmacmounts);
return (label);
}
static struct label *
mac_mount_fs_label_alloc(void)
{
struct label *label;
label = mac_labelzone_alloc(M_WAITOK);
MAC_PERFORM(init_mount_fs_label, label);
MAC_DEBUG_COUNTER_INC(&nmacmounts);
return (label);
}
void
mac_init_mount(struct mount *mp)
{
mp->mnt_mntlabel = mac_mount_label_alloc();
mp->mnt_fslabel = mac_mount_fs_label_alloc();
}
struct label *
mac_vnode_label_alloc(void)
{
struct label *label;
label = mac_labelzone_alloc(M_WAITOK);
MAC_PERFORM(init_vnode_label, label);
MAC_DEBUG_COUNTER_INC(&nmacvnodes);
return (label);
}
void
mac_init_vnode(struct vnode *vp)
{
vp->v_label = mac_vnode_label_alloc();
}
static void
mac_devfsdirent_label_free(struct label *label)
{
MAC_PERFORM(destroy_devfsdirent_label, label);
mac_labelzone_free(label);
MAC_DEBUG_COUNTER_DEC(&nmacdevfsdirents);
}
void
mac_destroy_devfsdirent(struct devfs_dirent *de)
{
mac_devfsdirent_label_free(de->de_label);
de->de_label = NULL;
}
static void
mac_mount_label_free(struct label *label)
{
MAC_PERFORM(destroy_mount_label, label);
mac_labelzone_free(label);
MAC_DEBUG_COUNTER_DEC(&nmacmounts);
}
static void
mac_mount_fs_label_free(struct label *label)
{
MAC_PERFORM(destroy_mount_fs_label, label);
mac_labelzone_free(label);
MAC_DEBUG_COUNTER_DEC(&nmacmounts);
}
void
mac_destroy_mount(struct mount *mp)
{
mac_mount_fs_label_free(mp->mnt_fslabel);
mp->mnt_fslabel = NULL;
mac_mount_label_free(mp->mnt_mntlabel);
mp->mnt_mntlabel = NULL;
}
void
mac_vnode_label_free(struct label *label)
{
MAC_PERFORM(destroy_vnode_label, label);
mac_labelzone_free(label);
MAC_DEBUG_COUNTER_DEC(&nmacvnodes);
}
void
mac_destroy_vnode(struct vnode *vp)
{
mac_vnode_label_free(vp->v_label);
vp->v_label = NULL;
}
void
mac_copy_vnode_label(struct label *src, struct label *dest)
{
MAC_PERFORM(copy_vnode_label, src, dest);
}
int
mac_externalize_vnode_label(struct label *label, char *elements,
char *outbuf, size_t outbuflen)
{
int error;
MAC_EXTERNALIZE(vnode, label, elements, outbuf, outbuflen);
return (error);
}
int
mac_internalize_vnode_label(struct label *label, char *string)
{
int error;
MAC_INTERNALIZE(vnode, label, string);
return (error);
}
void
mac_update_devfsdirent(struct mount *mp, struct devfs_dirent *de,
struct vnode *vp)
{
MAC_PERFORM(update_devfsdirent, mp, de, de->de_label, vp,
vp->v_label);
}
void
mac_associate_vnode_devfs(struct mount *mp, struct devfs_dirent *de,
struct vnode *vp)
{
MAC_PERFORM(associate_vnode_devfs, mp, mp->mnt_fslabel, de,
de->de_label, vp, vp->v_label);
}
int
mac_associate_vnode_extattr(struct mount *mp, struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_associate_vnode_extattr");
MAC_CHECK(associate_vnode_extattr, mp, mp->mnt_fslabel, vp,
vp->v_label);
return (error);
}
void
mac_associate_vnode_singlelabel(struct mount *mp, struct vnode *vp)
{
MAC_PERFORM(associate_vnode_singlelabel, mp, mp->mnt_fslabel, vp,
vp->v_label);
}
int
mac_create_vnode_extattr(struct ucred *cred, struct mount *mp,
struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_create_vnode_extattr");
ASSERT_VOP_LOCKED(vp, "mac_create_vnode_extattr");
error = VOP_OPENEXTATTR(vp, cred, curthread);
if (error == EOPNOTSUPP) {
/* XXX: Optionally abort if transactions not supported. */
if (ea_warn_once == 0) {
printf("Warning: transactions not supported "
"in EA write.\n");
ea_warn_once = 1;
}
} else if (error)
return (error);
MAC_CHECK(create_vnode_extattr, cred, mp, mp->mnt_fslabel,
dvp, dvp->v_label, vp, vp->v_label, cnp);
if (error) {
VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread);
return (error);
}
error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread);
if (error == EOPNOTSUPP)
error = 0; /* XXX */
return (error);
}
static int
mac_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp,
struct label *intlabel)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_setlabel_vnode_extattr");
error = VOP_OPENEXTATTR(vp, cred, curthread);
if (error == EOPNOTSUPP) {
/* XXX: Optionally abort if transactions not supported. */
if (ea_warn_once == 0) {
printf("Warning: transactions not supported "
"in EA write.\n");
ea_warn_once = 1;
}
} else if (error)
return (error);
MAC_CHECK(setlabel_vnode_extattr, cred, vp, vp->v_label, intlabel);
if (error) {
VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread);
return (error);
}
error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread);
if (error == EOPNOTSUPP)
error = 0; /* XXX */
return (error);
}
void
mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp,
struct label *interpvnodelabel, struct image_params *imgp)
{
ASSERT_VOP_LOCKED(vp, "mac_execve_transition");
if (!mac_enforce_process && !mac_enforce_fs)
return;
MAC_PERFORM(execve_transition, old, new, vp, vp->v_label,
interpvnodelabel, imgp, imgp->execlabel);
}
int
mac_execve_will_transition(struct ucred *old, struct vnode *vp,
struct label *interpvnodelabel, struct image_params *imgp)
{
int result;
ASSERT_VOP_LOCKED(vp, "mac_execve_will_transition");
if (!mac_enforce_process && !mac_enforce_fs)
return (0);
result = 0;
MAC_BOOLEAN(execve_will_transition, ||, old, vp, vp->v_label,
interpvnodelabel, imgp, imgp->execlabel);
return (result);
}
int
mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int acc_mode)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_access, cred, vp, vp->v_label, acc_mode);
return (error);
}
int
mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_chdir, cred, dvp, dvp->v_label);
return (error);
}
int
mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_chroot, cred, dvp, dvp->v_label);
return (error);
}
int
mac_check_vnode_create(struct ucred *cred, struct vnode *dvp,
struct componentname *cnp, struct vattr *vap)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_create, cred, dvp, dvp->v_label, cnp, vap);
return (error);
}
int
mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp,
struct componentname *cnp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete");
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_delete, cred, dvp, dvp->v_label, vp,
vp->v_label, cnp);
return (error);
}
int
mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
acl_type_t type)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_deleteacl, cred, vp, vp->v_label, type);
return (error);
}
int
mac_check_vnode_deleteextattr(struct ucred *cred, struct vnode *vp,
int attrnamespace, const char *name)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteextattr");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_deleteextattr, cred, vp, vp->v_label,
attrnamespace, name);
return (error);
}
int
mac_check_vnode_exec(struct ucred *cred, struct vnode *vp,
struct image_params *imgp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec");
if (!mac_enforce_process && !mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_exec, cred, vp, vp->v_label, imgp,
imgp->execlabel);
return (error);
}
int
mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_getacl, cred, vp, vp->v_label, type);
return (error);
}
int
mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
int attrnamespace, const char *name, struct uio *uio)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_getextattr, cred, vp, vp->v_label,
attrnamespace, name, uio);
return (error);
}
int
mac_check_vnode_link(struct ucred *cred, struct vnode *dvp,
struct vnode *vp, struct componentname *cnp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link");
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_link, cred, dvp, dvp->v_label, vp,
vp->v_label, cnp);
return (error);
}
int
mac_check_vnode_listextattr(struct ucred *cred, struct vnode *vp,
int attrnamespace)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_listextattr");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_listextattr, cred, vp, vp->v_label,
attrnamespace);
return (error);
}
int
mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
struct componentname *cnp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_lookup, cred, dvp, dvp->v_label, cnp);
return (error);
}
int
mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, int prot)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap");
if (!mac_enforce_fs || !mac_enforce_vm)
return (0);
MAC_CHECK(check_vnode_mmap, cred, vp, vp->v_label, prot);
return (error);
}
void
mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot)
{
int result = *prot;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade");
if (!mac_enforce_fs || !mac_enforce_vm)
return;
MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, vp->v_label,
&result);
*prot = result;
}
int
mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect");
if (!mac_enforce_fs || !mac_enforce_vm)
return (0);
MAC_CHECK(check_vnode_mprotect, cred, vp, vp->v_label, prot);
return (error);
}
int
mac_check_vnode_open(struct ucred *cred, struct vnode *vp, int acc_mode)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_open, cred, vp, vp->v_label, acc_mode);
return (error);
}
int
mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
vp->v_label);
return (error);
}
int
mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
vp->v_label);
return (error);
}
int
mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_readdir, cred, dvp, dvp->v_label);
return (error);
}
int
mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_readlink, cred, vp, vp->v_label);
return (error);
}
static int
mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
struct label *newlabel)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel");
MAC_CHECK(check_vnode_relabel, cred, vp, vp->v_label, newlabel);
return (error);
}
int
mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
struct vnode *vp, struct componentname *cnp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from");
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_rename_from, cred, dvp, dvp->v_label, vp,
vp->v_label, cnp);
return (error);
}
int
mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
struct vnode *vp, int samedir, struct componentname *cnp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to");
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_rename_to, cred, dvp, dvp->v_label, vp,
vp != NULL ? vp->v_label : NULL, samedir, cnp);
return (error);
}
int
mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_revoke, cred, vp, vp->v_label);
return (error);
}
int
mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type,
struct acl *acl)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_setacl, cred, vp, vp->v_label, type, acl);
return (error);
}
int
mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
int attrnamespace, const char *name, struct uio *uio)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_setextattr, cred, vp, vp->v_label,
attrnamespace, name, uio);
return (error);
}
int
mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_setflags, cred, vp, vp->v_label, flags);
return (error);
}
int
mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_setmode, cred, vp, vp->v_label, mode);
return (error);
}
int
mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid,
gid_t gid)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_setowner, cred, vp, vp->v_label, uid, gid);
return (error);
}
int
mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
struct timespec atime, struct timespec mtime)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_setutimes, cred, vp, vp->v_label, atime,
mtime);
return (error);
}
int
mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
vp->v_label);
return (error);
}
int
mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
vp->v_label);
return (error);
}
void
mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel)
{
MAC_PERFORM(relabel_vnode, cred, vp, vp->v_label, newlabel);
}
void
mac_create_mount(struct ucred *cred, struct mount *mp)
{
MAC_PERFORM(create_mount, cred, mp, mp->mnt_mntlabel,
mp->mnt_fslabel);
}
void
mac_create_root_mount(struct ucred *cred, struct mount *mp)
{
MAC_PERFORM(create_root_mount, cred, mp, mp->mnt_mntlabel,
mp->mnt_fslabel);
}
int
mac_check_mount_stat(struct ucred *cred, struct mount *mount)
{
int error;
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_mount_stat, cred, mount, mount->mnt_mntlabel);
return (error);
}
void
mac_create_devfs_device(struct mount *mp, struct cdev *dev, struct devfs_dirent *de)
{
MAC_PERFORM(create_devfs_device, mp, dev, de, de->de_label);
}
void
mac_create_devfs_symlink(struct ucred *cred, struct mount *mp,
struct devfs_dirent *dd, struct devfs_dirent *de)
{
MAC_PERFORM(create_devfs_symlink, cred, mp, dd, dd->de_label, de,
de->de_label);
}
void
mac_create_devfs_directory(struct mount *mp, char *dirname, int dirnamelen,
struct devfs_dirent *de)
{
MAC_PERFORM(create_devfs_directory, mp, dirname, dirnamelen, de,
de->de_label);
}
/*
* Implementation of VOP_SETLABEL() that relies on extended attributes
* to store label data. Can be referenced by filesystems supporting
* extended attributes.
*/
int
vop_stdsetlabel_ea(struct vop_setlabel_args *ap)
{
struct vnode *vp = ap->a_vp;
struct label *intlabel = ap->a_label;
int error;
ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
return (EOPNOTSUPP);
error = mac_setlabel_vnode_extattr(ap->a_cred, vp, intlabel);
if (error)
return (error);
mac_relabel_vnode(ap->a_cred, vp, intlabel);
return (0);
}
int
vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred)
{
int error;
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 (EOPNOTSUPP);
/*
* 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 VOP_SETLABEL()?
*/
error = mac_check_vnode_relabel(cred, vp, intlabel);
if (error)
return (error);
/*
* VADMIN provides the opportunity for the filesystem to make
* decisions about who is and is not able to modify labels
* and protections on files. This might not be right. We can't
* assume VOP_SETLABEL() will do it, because we might implement
* that as part of vop_stdsetlabel_ea().
*/
error = VOP_ACCESS(vp, VADMIN, cred, curthread);
if (error)
return (error);
error = VOP_SETLABEL(vp, intlabel, cred, curthread);
if (error)
return (error);
return (0);
}