4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2016, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/obdclass/acl.c
34 * Lustre Access Control List.
36 * Author: Fan Yong <fanyong@clusterfs.com>
39 #define DEBUG_SUBSYSTEM S_SEC
40 #include <lu_object.h>
41 #include <lustre_acl.h>
42 #include <lustre_eacl.h>
43 #include <obd_support.h>
44 #ifdef HAVE_SERVER_SUPPORT
45 # include <lustre_idmap.h>
46 # include <md_object.h>
47 #endif /* HAVE_SERVER_SUPPORT */
49 #ifdef CONFIG_FS_POSIX_ACL
51 static inline void lustre_posix_acl_le_to_cpu(posix_acl_xattr_entry *d,
52 posix_acl_xattr_entry *s)
54 d->e_tag = le16_to_cpu(s->e_tag);
55 d->e_perm = le16_to_cpu(s->e_perm);
56 d->e_id = le32_to_cpu(s->e_id);
59 /*static inline void lustre_posix_acl_cpu_to_le(posix_acl_xattr_entry *d,
60 posix_acl_xattr_entry *s)
62 d->e_tag = cpu_to_le16(s->e_tag);
63 d->e_perm = cpu_to_le16(s->e_perm);
64 d->e_id = cpu_to_le32(s->e_id);
68 * Check permission based on POSIX ACL.
70 int lustre_posix_acl_permission(struct lu_ucred *mu, const struct lu_attr *la,
71 int want, posix_acl_xattr_entry *entry,
74 posix_acl_xattr_entry *pa, *pe, *mask_obj;
75 posix_acl_xattr_entry ae, me;
81 for (pa = &entry[0], pe = &entry[count - 1]; pa <= pe; pa++) {
82 lustre_posix_acl_le_to_cpu(&ae, pa);
85 /* (May have been checked already) */
86 if (la->la_uid == mu->uc_fsuid)
90 if (ae.e_id == mu->uc_fsuid)
94 if (lustre_in_group_p(mu, la->la_gid)) {
96 if ((ae.e_perm & want) == want)
101 if (lustre_in_group_p(mu, ae.e_id)) {
103 if ((ae.e_perm & want) == want)
121 for (mask_obj = pa + 1; mask_obj <= pe; mask_obj++) {
122 lustre_posix_acl_le_to_cpu(&me, mask_obj);
123 if (me.e_tag == ACL_MASK) {
124 if ((ae.e_perm & me.e_perm & want) == want)
132 if ((ae.e_perm & want) == want)
137 EXPORT_SYMBOL(lustre_posix_acl_permission);
140 * Modify the ACL for the chmod.
142 int lustre_posix_acl_chmod_masq(posix_acl_xattr_entry *entry, __u32 mode,
145 posix_acl_xattr_entry *group_obj = NULL, *mask_obj = NULL, *pa, *pe;
147 for (pa = &entry[0], pe = &entry[count - 1]; pa <= pe; pa++) {
148 switch (le16_to_cpu(pa->e_tag)) {
150 pa->e_perm = cpu_to_le16((mode & S_IRWXU) >> 6);
162 pa->e_perm = cpu_to_le16(mode & S_IRWXO);
170 mask_obj->e_perm = cpu_to_le16((mode & S_IRWXG) >> 3);
174 group_obj->e_perm = cpu_to_le16((mode & S_IRWXG) >> 3);
179 EXPORT_SYMBOL(lustre_posix_acl_chmod_masq);
182 * Returns 0 if the acl can be exactly represented in the traditional
183 * file mode permission bits, or else 1. Returns -E... on error.
186 lustre_posix_acl_equiv_mode(posix_acl_xattr_entry *entry, mode_t *mode_p,
189 posix_acl_xattr_entry *pa, *pe;
193 for (pa = &entry[0], pe = &entry[count - 1]; pa <= pe; pa++) {
194 __u16 perm = le16_to_cpu(pa->e_perm);
195 switch (le16_to_cpu(pa->e_tag)) {
197 mode |= (perm & S_IRWXO) << 6;
200 mode |= (perm & S_IRWXO) << 3;
203 mode |= perm & S_IRWXO;
206 mode = (mode & ~S_IRWXG) |
207 ((perm & S_IRWXO) << 3);
219 *mode_p = (*mode_p & ~S_IRWXUGO) | mode;
222 EXPORT_SYMBOL(lustre_posix_acl_equiv_mode);
225 * Modify acl when creating a new object.
227 int lustre_posix_acl_create_masq(posix_acl_xattr_entry *entry, __u32 *pmode,
230 posix_acl_xattr_entry *group_obj = NULL, *mask_obj = NULL, *pa, *pe;
231 posix_acl_xattr_entry ae;
235 for (pa = &entry[0], pe = &entry[count - 1]; pa <= pe; pa++) {
236 lustre_posix_acl_le_to_cpu(&ae, pa);
239 ae.e_perm &= (mode >> 6) | ~S_IRWXO;
240 pa->e_perm = cpu_to_le16(ae.e_perm);
241 mode &= (ae.e_perm << 6) | ~S_IRWXU;
251 ae.e_perm &= mode | ~S_IRWXO;
252 pa->e_perm = cpu_to_le16(ae.e_perm);
253 mode &= ae.e_perm | ~S_IRWXO;
265 ae.e_perm = le16_to_cpu(mask_obj->e_perm) &
266 ((mode >> 3) | ~S_IRWXO);
267 mode &= (ae.e_perm << 3) | ~S_IRWXG;
268 mask_obj->e_perm = cpu_to_le16(ae.e_perm);
272 ae.e_perm = le16_to_cpu(group_obj->e_perm) &
273 ((mode >> 3) | ~S_IRWXO);
274 mode &= (ae.e_perm << 3) | ~S_IRWXG;
275 group_obj->e_perm = cpu_to_le16(ae.e_perm);
278 *pmode = (*pmode & ~S_IRWXUGO) | mode;
281 EXPORT_SYMBOL(lustre_posix_acl_create_masq);