2 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/types.h>
31 #include <sys/param.h>
33 #include <sys/vnode.h>
34 #include <sys/mntent.h>
35 #include <sys/mount.h>
38 #include <sys/policy.h>
39 #include <sys/zfs_vfsops.h>
43 secpolicy_nfs(cred_t *cr)
46 return (spl_priv_check_cred(cr, PRIV_NFS_DAEMON));
50 secpolicy_zfs(cred_t *cr)
53 return (spl_priv_check_cred(cr, PRIV_VFS_MOUNT));
57 secpolicy_zfs_proc(cred_t *cr, proc_t *proc)
60 return (spl_priv_check_cred(cr, PRIV_VFS_MOUNT));
64 secpolicy_sys_config(cred_t *cr, int checkonly __unused)
67 return (spl_priv_check_cred(cr, PRIV_ZFS_POOL_CONFIG));
71 secpolicy_zinject(cred_t *cr)
74 return (spl_priv_check_cred(cr, PRIV_ZFS_INJECT));
78 secpolicy_fs_unmount(cred_t *cr, struct mount *vfsp __unused)
81 return (spl_priv_check_cred(cr, PRIV_VFS_UNMOUNT));
85 secpolicy_fs_owner(struct mount *mp, cred_t *cr)
88 if (zfs_super_owner) {
89 if (cr->cr_uid == mp->mnt_cred->cr_uid &&
90 cr->cr_prison == mp->mnt_cred->cr_prison) {
98 * This check is done in kern_link(), so we could just return 0 here.
100 extern int hardlink_check_uid;
102 secpolicy_basic_link(vnode_t *vp, cred_t *cr)
105 if (!hardlink_check_uid)
107 if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
109 return (spl_priv_check_cred(cr, PRIV_VFS_LINK));
113 secpolicy_vnode_stky_modify(cred_t *cr)
120 secpolicy_vnode_remove(vnode_t *vp, cred_t *cr)
123 if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
125 return (spl_priv_check_cred(cr, PRIV_VFS_ADMIN));
129 secpolicy_vnode_access(cred_t *cr, vnode_t *vp, uid_t owner, accmode_t accmode)
132 if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
135 if ((accmode & VREAD) && spl_priv_check_cred(cr, PRIV_VFS_READ) != 0)
137 if ((accmode & VWRITE) &&
138 spl_priv_check_cred(cr, PRIV_VFS_WRITE) != 0) {
141 if (accmode & VEXEC) {
142 if (vp->v_type == VDIR) {
143 if (spl_priv_check_cred(cr, PRIV_VFS_LOOKUP) != 0)
146 if (spl_priv_check_cred(cr, PRIV_VFS_EXEC) != 0)
154 * Like secpolicy_vnode_access() but we get the actual wanted mode and the
155 * current mode of the file, not the missing bits.
158 secpolicy_vnode_access2(cred_t *cr, vnode_t *vp, uid_t owner,
159 accmode_t curmode, accmode_t wantmode)
163 mode = ~curmode & wantmode;
168 return (secpolicy_vnode_access(cr, vp, owner, mode));
172 secpolicy_vnode_any_access(cred_t *cr, vnode_t *vp, uid_t owner)
174 static int privs[] = {
183 if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
186 /* Same as secpolicy_vnode_setdac */
187 if (owner == cr->cr_uid)
190 for (i = 0; i < sizeof (privs)/sizeof (int); i++) {
193 switch (priv = privs[i]) {
195 if (vp->v_type == VDIR)
198 case PRIV_VFS_LOOKUP:
199 if (vp->v_type != VDIR)
203 if (spl_priv_check_cred(cr, priv) == 0)
210 secpolicy_vnode_setdac(vnode_t *vp, cred_t *cr, uid_t owner)
213 if (owner == cr->cr_uid)
215 if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
217 return (spl_priv_check_cred(cr, PRIV_VFS_ADMIN));
221 secpolicy_vnode_setattr(cred_t *cr, vnode_t *vp, struct vattr *vap,
222 const struct vattr *ovap, int flags,
223 int unlocked_access(void *, int, cred_t *), void *node)
225 int mask = vap->va_mask;
228 if (mask & AT_SIZE) {
229 if (vp->v_type == VDIR)
231 error = unlocked_access(node, VWRITE, cr);
235 if (mask & AT_MODE) {
237 * If not the owner of the file then check privilege
238 * for two things: the privilege to set the mode at all
239 * and, if we're setting setuid, we also need permissions
240 * to add the set-uid bit, if we're not the owner.
241 * In the specific case of creating a set-uid root
242 * file, we need even more permissions.
244 error = secpolicy_vnode_setdac(vp, cr, ovap->va_uid);
247 error = secpolicy_setid_setsticky_clear(vp, vap, ovap, cr);
251 vap->va_mode = ovap->va_mode;
253 if (mask & (AT_UID | AT_GID)) {
254 error = secpolicy_vnode_setdac(vp, cr, ovap->va_uid);
259 * To change the owner of a file, or change the group of
260 * a file to a group of which we are not a member, the
261 * caller must have privilege.
263 if (((mask & AT_UID) && vap->va_uid != ovap->va_uid) ||
264 ((mask & AT_GID) && vap->va_gid != ovap->va_gid &&
265 !groupmember(vap->va_gid, cr))) {
266 if (secpolicy_fs_owner(vp->v_mount, cr) != 0) {
267 error = spl_priv_check_cred(cr, PRIV_VFS_CHOWN);
273 if (((mask & AT_UID) && vap->va_uid != ovap->va_uid) ||
274 ((mask & AT_GID) && vap->va_gid != ovap->va_gid)) {
275 secpolicy_setid_clear(vap, vp, cr);
278 if (mask & (AT_ATIME | AT_MTIME)) {
281 * If times is NULL, ... The caller must be the owner of
282 * the file, have permission to write the file, or be the
284 * If times is non-NULL, ... The caller must be the owner of
285 * the file or be the super-user.
287 error = secpolicy_vnode_setdac(vp, cr, ovap->va_uid);
288 if (error && (vap->va_vaflags & VA_UTIMES_NULL))
289 error = unlocked_access(node, VWRITE, cr);
297 secpolicy_vnode_create_gid(cred_t *cr)
304 secpolicy_vnode_setids_setgids(vnode_t *vp, cred_t *cr, gid_t gid)
307 if (groupmember(gid, cr))
309 if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
311 return (spl_priv_check_cred(cr, PRIV_VFS_SETGID));
315 secpolicy_vnode_setid_retain(vnode_t *vp, cred_t *cr,
316 boolean_t issuidroot __unused)
319 if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
321 return (spl_priv_check_cred(cr, PRIV_VFS_RETAINSUGID));
325 secpolicy_setid_clear(struct vattr *vap, vnode_t *vp, cred_t *cr)
328 if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
331 if ((vap->va_mode & (S_ISUID | S_ISGID)) != 0) {
332 if (spl_priv_check_cred(cr, PRIV_VFS_RETAINSUGID)) {
333 vap->va_mask |= AT_MODE;
334 vap->va_mode &= ~(S_ISUID|S_ISGID);
340 secpolicy_setid_setsticky_clear(vnode_t *vp, struct vattr *vap,
341 const struct vattr *ovap, cred_t *cr)
345 if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
349 * Privileged processes may set the sticky bit on non-directories,
350 * as well as set the setgid bit on a file with a group that the process
351 * is not a member of. Both of these are allowed in jail(8).
353 if (vp->v_type != VDIR && (vap->va_mode & S_ISTXT)) {
354 if (spl_priv_check_cred(cr, PRIV_VFS_STICKYFILE))
358 * Check for privilege if attempting to set the
361 if ((vap->va_mode & S_ISGID) != 0) {
362 error = secpolicy_vnode_setids_setgids(vp, cr, ovap->va_gid);
367 * Deny setting setuid if we are not the file owner.
369 if ((vap->va_mode & S_ISUID) && ovap->va_uid != cr->cr_uid) {
370 error = spl_priv_check_cred(cr, PRIV_VFS_ADMIN);
378 secpolicy_fs_mount(cred_t *cr, vnode_t *mvp, struct mount *vfsp)
381 return (spl_priv_check_cred(cr, PRIV_VFS_MOUNT));
385 secpolicy_vnode_owner(vnode_t *vp, cred_t *cr, uid_t owner)
388 if (owner == cr->cr_uid)
390 if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
393 /* XXX: vfs_suser()? */
394 return (spl_priv_check_cred(cr, PRIV_VFS_MOUNT_OWNER));
398 secpolicy_vnode_chown(vnode_t *vp, cred_t *cr, uid_t owner)
401 if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
403 return (spl_priv_check_cred(cr, PRIV_VFS_CHOWN));
407 secpolicy_fs_mount_clearopts(cred_t *cr, struct mount *vfsp)
410 if (spl_priv_check_cred(cr, PRIV_VFS_MOUNT_NONUSER) != 0) {
412 vfsp->vfs_flag |= VFS_NOSETUID | MNT_USER;
413 vfs_clearmntopt(vfsp, MNTOPT_SETUID);
414 vfs_setmntopt(vfsp, MNTOPT_NOSETUID, NULL, 0);
420 * Check privileges for setting xvattr attributes
423 secpolicy_xvattr(vnode_t *vp, xvattr_t *xvap, uid_t owner, cred_t *cr,
427 if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
429 return (spl_priv_check_cred(cr, PRIV_VFS_SYSFLAGS));
433 secpolicy_smb(cred_t *cr)
436 return (spl_priv_check_cred(cr, PRIV_NETSMB));