freebsd-nq/sys/cddl/compat/opensolaris/kern/opensolaris_policy.c
Robert Watson 32f9753cfb Eliminate now-unused SUSER_ALLOWJAIL arguments to priv_check_cred(); in
some cases, move to priv_check() if it was an operation on a thread and
no other flags were present.

Eliminate caller-side jail exception checking (also now-unused); jail
privilege exception code now goes solely in kern_jail.c.

We can't yet eliminate suser() due to some cases in the KAME code where
a privilege check is performed and then used in many different deferred
paths.  Do, however, move those prototypes to priv.h.

Reviewed by:	csjp
Obtained from:	TrustedBSD Project
2007-06-12 00:12:01 +00:00

262 lines
6.5 KiB
C

/*-
* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* 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 AUTHORS 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 AUTHORS 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/priv.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/policy.h>
int
secpolicy_zfs(struct ucred *cred)
{
return (priv_check_cred(cred, PRIV_VFS_MOUNT, 0));
}
int
secpolicy_sys_config(struct ucred *cred, int checkonly __unused)
{
return (priv_check_cred(cred, PRIV_ZFS_POOL_CONFIG, 0));
}
int
secpolicy_zinject(struct ucred *cred)
{
return (priv_check_cred(cred, PRIV_ZFS_INJECT, 0));
}
int
secpolicy_fs_unmount(struct ucred *cred, struct mount *vfsp __unused)
{
return (priv_check_cred(cred, PRIV_VFS_UNMOUNT, 0));
}
/*
* This check is done in kern_link(), so we could just return 0 here.
*/
extern int hardlink_check_uid;
int
secpolicy_basic_link(struct ucred *cred)
{
if (!hardlink_check_uid)
return (0);
return (priv_check_cred(cred, PRIV_VFS_LINK, 0));
}
int
secpolicy_vnode_stky_modify(struct ucred *cred)
{
return (EPERM);
}
int
secpolicy_vnode_remove(struct ucred *cred)
{
return (priv_check_cred(cred, PRIV_VFS_ADMIN, 0));
}
int
secpolicy_vnode_access(struct ucred *cred, struct vnode *vp, uint64_t owner,
int mode)
{
if ((mode & VREAD) && priv_check_cred(cred, PRIV_VFS_READ, 0) != 0) {
return (EACCES);
}
if ((mode & VWRITE) &&
priv_check_cred(cred, PRIV_VFS_WRITE, 0) != 0) {
return (EACCES);
}
if (mode & VEXEC) {
if (vp->v_type == VDIR) {
if (priv_check_cred(cred, PRIV_VFS_LOOKUP, 0) != 0) {
return (EACCES);
}
} else {
if (priv_check_cred(cred, PRIV_VFS_EXEC, 0) != 0) {
return (EACCES);
}
}
}
return (0);
}
int
secpolicy_vnode_setdac(struct ucred *cred, uid_t owner)
{
if (owner == cred->cr_uid)
return (0);
return (priv_check_cred(cred, PRIV_VFS_ADMIN, 0));
}
int
secpolicy_vnode_setattr(struct ucred *cred, struct vnode *vp, struct vattr *vap,
const struct vattr *ovap, int flags,
int unlocked_access(void *, int, struct ucred *), void *node)
{
int mask = vap->va_mask;
int error;
if (mask & AT_SIZE) {
if (vp->v_type == VDIR)
return (EISDIR);
error = unlocked_access(node, VWRITE, cred);
if (error)
return (error);
}
if (mask & AT_MODE) {
/*
* If not the owner of the file then check privilege
* for two things: the privilege to set the mode at all
* and, if we're setting setuid, we also need permissions
* to add the set-uid bit, if we're not the owner.
* In the specific case of creating a set-uid root
* file, we need even more permissions.
*/
error = secpolicy_vnode_setdac(cred, ovap->va_uid);
if (error)
return (error);
error = secpolicy_setid_setsticky_clear(vp, vap, ovap, cred);
if (error)
return (error);
} else {
vap->va_mode = ovap->va_mode;
}
if (mask & (AT_UID | AT_GID)) {
error = secpolicy_vnode_setdac(cred, ovap->va_uid);
if (error)
return (error);
/*
* To change the owner of a file, or change the group of a file to a
* group of which we are not a member, the caller must have
* privilege.
*/
if (((mask & AT_UID) && vap->va_uid != ovap->va_uid) ||
((mask & AT_GID) && vap->va_gid != ovap->va_gid &&
!groupmember(vap->va_gid, cred))) {
error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
if (error)
return (error);
}
if (((mask & AT_UID) && vap->va_uid != ovap->va_uid) ||
((mask & AT_GID) && vap->va_gid != ovap->va_gid)) {
secpolicy_setid_clear(vap, cred);
}
}
if (mask & (AT_ATIME | AT_MTIME)) {
/*
* From utimes(2):
* If times is NULL, ... The caller must be the owner of
* the file, have permission to write the file, or be the
* super-user.
* If times is non-NULL, ... The caller must be the owner of
* the file or be the super-user.
*/
error = secpolicy_vnode_setdac(cred, ovap->va_uid);
if (error && (vap->va_vaflags & VA_UTIMES_NULL))
error = unlocked_access(node, VWRITE, cred);
if (error)
return (error);
}
return (0);
}
int
secpolicy_vnode_create_gid(struct ucred *cred)
{
return (EPERM);
}
int
secpolicy_vnode_setids_setgids(struct ucred *cred, gid_t gid)
{
if (!groupmember(gid, cred))
return (priv_check_cred(cred, PRIV_VFS_SETGID, 0));
return (0);
}
int
secpolicy_vnode_setid_retain(struct ucred *cred, boolean_t issuidroot __unused)
{
return (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0));
}
void
secpolicy_setid_clear(struct vattr *vap, struct ucred *cred)
{
if ((vap->va_mode & (S_ISUID | S_ISGID)) != 0) {
if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0)) {
vap->va_mask |= AT_MODE;
vap->va_mode &= ~(S_ISUID|S_ISGID);
}
}
}
int
secpolicy_setid_setsticky_clear(struct vnode *vp, struct vattr *vap,
const struct vattr *ovap, struct ucred *cred)
{
int error;
/*
* Privileged processes may set the sticky bit on non-directories,
* as well as set the setgid bit on a file with a group that the process
* is not a member of. Both of these are allowed in jail(8).
*/
if (vp->v_type != VDIR && (vap->va_mode & S_ISTXT)) {
if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0))
return (EFTYPE);
}
/*
* Check for privilege if attempting to set the
* group-id bit.
*/
if ((vap->va_mode & S_ISGID) != 0) {
error = secpolicy_vnode_setids_setgids(cred, ovap->va_gid);
if (error)
return (error);
}
return (0);
}