2 * (The copyright below applies to ufs_access())
4 * Copyright (c) 1982, 1986, 1989, 1993, 1995
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
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30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
41 * $DragonFly: src/sys/kern/vfs_helper.c,v 1.3 2007/11/20 21:37:54 dillon Exp $
44 #include "opt_quota.h"
45 #include "opt_suiddir.h"
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
50 #include <sys/fcntl.h>
52 #include <sys/mount.h>
53 #include <sys/unistd.h>
54 #include <sys/vnode.h>
55 #include <sys/file.h> /* XXX */
61 * Provide standard UNIX semanics for VOP_ACCESS, but without the quota
62 * code. This procedure was basically pulled out of UFS.
65 vop_helper_access(struct vop_access_args
*ap
, uid_t ino_uid
, gid_t ino_gid
,
66 mode_t ino_mode
, u_int32_t ino_flags
)
68 struct vnode
*vp
= ap
->a_vp
;
69 struct ucred
*cred
= ap
->a_cred
;
70 mode_t mask
, mode
= ap
->a_mode
;
78 * Disallow write attempts on read-only filesystems;
79 * unless the file is a socket, fifo, or a block or
80 * character device resident on the filesystem.
88 if (vp
->v_mount
->mnt_flag
& MNT_RDONLY
)
91 /* check quota here XXX */
99 /* If immutable bit set, nobody gets to write it. */
100 if ((mode
& VWRITE
) && (ino_flags
& IMMUTABLE
))
103 /* Otherwise, user id 0 always gets access. */
104 if (cred
->cr_uid
== 0)
109 /* Otherwise, check the owner. */
110 if (cred
->cr_uid
== ino_uid
) {
117 return ((ino_mode
& mask
) == mask
? 0 : EACCES
);
120 /* Otherwise, check the groups. */
121 for (i
= 0, gp
= cred
->cr_groups
; i
< cred
->cr_ngroups
; i
++, gp
++)
122 if (ino_gid
== *gp
) {
129 return ((ino_mode
& mask
) == mask
? 0 : EACCES
);
132 /* Otherwise, check everyone else. */
139 return ((ino_mode
& mask
) == mask
? 0 : EACCES
);
143 vop_helper_setattr_flags(u_int32_t
*ino_flags
, u_int32_t vaflags
,
144 uid_t uid
, struct ucred
*cred
)
149 * If uid doesn't match only the super-user can change the flags
151 if (cred
->cr_uid
!= uid
&&
152 (error
= suser_cred(cred
, PRISON_ROOT
))) {
155 if (cred
->cr_uid
== 0 &&
156 (!jailed(cred
)|| jail_chflags_allowed
)) {
157 if ((*ino_flags
& (SF_NOUNLINK
|SF_IMMUTABLE
|SF_APPEND
)) &&
160 *ino_flags
= vaflags
;
162 if (*ino_flags
& (SF_NOUNLINK
|SF_IMMUTABLE
|SF_APPEND
) ||
163 (vaflags
& UF_SETTABLE
) != vaflags
)
165 *ino_flags
&= SF_SETTABLE
;
166 *ino_flags
|= vaflags
& UF_SETTABLE
;
172 vop_helper_create_uid(struct mount
*mp
, mode_t dmode
, uid_t duid
,
173 struct ucred
*cred
, mode_t
*modep
)
176 if ((mount
->mnt_flag
& MNT_SUIDDIR
) && (dmode
& ISUID
) &&
177 duid
!= cred
->cr_uid
&& duid
) {
182 return(cred
->cr_uid
);