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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
31 * This file is part of Lustre, http://www.lustre.org/
32 * Lustre is a trademark of Sun Microsystems, Inc.
34 * lustre/mdd/mdd_permission.c
36 * Lustre Metadata Server (mdd) routines
38 * Author: fangyong@clusterfs.com
39 * Author: lsy@clusterfs.com
42 #define DEBUG_SUBSYSTEM S_MDS
44 #include <linux/module.h>
45 #include <ldiskfs/ldiskfs_jbd2.h>
47 #include <obd_class.h>
48 #include <lustre_ver.h>
49 #include <obd_support.h>
50 #include <lprocfs_status.h>
52 #include <ldiskfs/ldiskfs.h>
53 #include <lustre_mds.h>
54 #include <lustre/lustre_idl.h>
56 #include "mdd_internal.h"
58 #ifdef CONFIG_FS_POSIX_ACL
61 * Get default acl EA only.
62 * Hold read_lock for mdd_obj.
64 int mdd_def_acl_get(const struct lu_env *env, struct mdd_object *mdd_obj,
71 if (ma->ma_valid & MA_ACL_DEF)
74 buf = mdd_buf_get(env, ma->ma_acl, ma->ma_acl_size);
75 rc = mdo_xattr_get(env, mdd_obj, buf, XATTR_NAME_ACL_DEFAULT,
79 ma->ma_valid |= MA_ACL_DEF;
81 } else if ((rc == -EOPNOTSUPP) || (rc == -ENODATA)) {
88 * Hold write_lock for o.
90 int mdd_acl_chmod(const struct lu_env *env, struct mdd_object *o, __u32 mode,
91 struct thandle *handle)
94 posix_acl_xattr_header *head;
95 posix_acl_xattr_entry *entry;
101 buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
102 sizeof(mdd_env_info(env)->mti_xattr_buf));
104 rc = mdo_xattr_get(env, o, buf, XATTR_NAME_ACL_ACCESS, BYPASS_CAPA);
105 if ((rc == -EOPNOTSUPP) || (rc == -ENODATA))
111 head = (posix_acl_xattr_header *)(buf->lb_buf);
112 entry = head->a_entries;
113 entry_count = (buf->lb_len - sizeof(head->a_version)) /
114 sizeof(posix_acl_xattr_entry);
115 if (entry_count <= 0)
118 rc = lustre_posix_acl_chmod_masq(entry, mode, entry_count);
122 rc = mdo_xattr_set(env, o, buf, XATTR_NAME_ACL_ACCESS,
123 0, handle, BYPASS_CAPA);
128 * Hold write_lock for obj.
130 int __mdd_acl_init(const struct lu_env *env, struct mdd_object *obj,
131 struct lu_buf *buf, __u32 *mode, struct thandle *handle)
133 posix_acl_xattr_header *head;
134 posix_acl_xattr_entry *entry;
140 head = (posix_acl_xattr_header *)(buf->lb_buf);
141 entry = head->a_entries;
142 entry_count = (buf->lb_len - sizeof(head->a_version)) /
143 sizeof(posix_acl_xattr_entry);
144 if (entry_count <= 0)
147 if (S_ISDIR(*mode)) {
148 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_DEFAULT, 0,
149 handle, BYPASS_CAPA);
154 rc = lustre_posix_acl_create_masq(entry, mode, entry_count);
158 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_ACCESS, 0, handle,
165 * Hold read_lock for obj.
167 static int mdd_check_acl(const struct lu_env *env, struct mdd_object *obj,
168 struct lu_attr *la, int mask)
170 #ifdef CONFIG_FS_POSIX_ACL
171 struct md_ucred *uc = md_ucred(env);
172 posix_acl_xattr_header *head;
173 posix_acl_xattr_entry *entry;
179 buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
180 sizeof(mdd_env_info(env)->mti_xattr_buf));
181 rc = mdo_xattr_get(env, obj, buf, XATTR_NAME_ACL_ACCESS,
182 mdd_object_capa(env, obj));
184 RETURN(rc ? : -EACCES);
187 head = (posix_acl_xattr_header *)(buf->lb_buf);
188 entry = head->a_entries;
189 entry_count = (buf->lb_len - sizeof(head->a_version)) /
190 sizeof(posix_acl_xattr_entry);
192 rc = lustre_posix_acl_permission(uc, la, mask, entry, entry_count);
200 int __mdd_permission_internal(const struct lu_env *env, struct mdd_object *obj,
201 struct lu_attr *la, int mask, int role)
203 struct md_ucred *uc = md_ucred(env);
211 /* These means unnecessary for permission check */
212 if ((uc == NULL) || (uc->mu_valid == UCRED_INIT))
215 /* Invalid user credit */
216 if (uc->mu_valid == UCRED_INVALID)
220 * Nobody gets write access to an immutable file.
222 if ((mask & MAY_WRITE) && mdd_is_immutable(obj))
226 la = &mdd_env_info(env)->mti_la;
227 rc = mdd_la_get(env, obj, la, BYPASS_CAPA);
233 if (uc->mu_fsuid == la->la_uid) {
236 if (mode & S_IRWXG) {
238 mdd_read_lock(env, obj, role);
239 rc = mdd_check_acl(env, obj, la, mask);
241 mdd_read_unlock(env, obj);
243 goto check_capabilities;
244 else if ((rc != -EAGAIN) && (rc != -EOPNOTSUPP) &&
248 if (lustre_in_group_p(uc, la->la_gid))
252 if (((mode & mask & S_IRWXO) == mask))
256 if (!(mask & MAY_EXEC) ||
257 (la->la_mode & S_IXUGO) || S_ISDIR(la->la_mode))
258 if (mdd_capable(uc, CFS_CAP_DAC_OVERRIDE))
261 if ((mask == MAY_READ) ||
262 (S_ISDIR(la->la_mode) && !(mask & MAY_WRITE)))
263 if (mdd_capable(uc, CFS_CAP_DAC_READ_SEARCH))
269 int mdd_permission(const struct lu_env *env,
270 struct md_object *pobj, struct md_object *cobj,
271 struct md_attr *ma, int mask)
273 struct mdd_object *mdd_pobj, *mdd_cobj;
274 struct md_ucred *uc = NULL;
275 struct lu_attr *la = NULL;
276 int check_create, check_link;
278 int check_rename_src, check_rename_tar;
279 int check_vtx_part, check_vtx_full;
285 mdd_cobj = md2mdd_obj(cobj);
287 /* For cross_open case, the "mask" is open flags,
288 * so convert it to permission mask first.
289 * XXX: MDS_OPEN_CROSS must be NOT equal to permission mask MAY_*. */
290 if (unlikely(mask & MDS_OPEN_CROSS)) {
291 la = &mdd_env_info(env)->mti_la;
292 rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
296 mask = accmode(env, la, mask & ~MDS_OPEN_CROSS);
299 check_create = mask & MAY_CREATE;
300 check_link = mask & MAY_LINK;
301 check_unlink = mask & MAY_UNLINK;
302 check_rename_src = mask & MAY_RENAME_SRC;
303 check_rename_tar = mask & MAY_RENAME_TAR;
304 check_vtx_part = mask & MAY_VTX_PART;
305 check_vtx_full = mask & MAY_VTX_FULL;
306 check_rgetfacl = mask & MAY_RGETFACL;
308 mask &= ~(MAY_CREATE | MAY_LINK |
310 MAY_RENAME_SRC | MAY_RENAME_TAR |
311 MAY_VTX_PART | MAY_VTX_FULL |
314 rc = mdd_permission_internal_locked(env, mdd_cobj, NULL, mask,
317 if (!rc && (check_create || check_link))
318 rc = mdd_may_create(env, mdd_cobj, NULL, 1, check_link);
320 if (!rc && check_unlink) {
322 rc = mdd_may_unlink(env, mdd_cobj, ma);
325 if (!rc && (check_rename_src || check_rename_tar)) {
328 mdd_pobj = md2mdd_obj(pobj);
329 rc = mdd_may_delete(env, mdd_pobj, mdd_cobj, ma, 1,
333 if (!rc && (check_vtx_part || check_vtx_full)) {
337 la = &mdd_env_info(env)->mti_la;
338 rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
343 if (!(la->la_mode & S_ISVTX) || (la->la_uid == uc->mu_fsuid) ||
344 (check_vtx_full && (ma->ma_attr.la_valid & LA_UID) &&
345 (ma->ma_attr.la_uid == uc->mu_fsuid))) {
346 ma->ma_attr_flags |= MDS_VTX_BYPASS;
348 ma->ma_attr_flags &= ~MDS_VTX_BYPASS;
354 if (unlikely(!rc && check_rgetfacl)) {
359 la = &mdd_env_info(env)->mti_la;
360 rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
365 if (la->la_uid != uc->mu_fsuid &&
366 !mdd_capable(uc, CFS_CAP_FOWNER))
373 int mdd_capa_get(const struct lu_env *env, struct md_object *obj,
374 struct lustre_capa *capa, int renewal)
376 struct mdd_object *mdd_obj = md2mdd_obj(obj);
381 oc = mdo_capa_get(env, mdd_obj, renewal ? capa : NULL,
385 } else if (likely(oc != NULL)) {