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 <obd_class.h>
45 #include <lustre_ver.h>
46 #include <lprocfs_status.h>
47 #include <lustre_mds.h>
49 #include "mdd_internal.h"
51 #ifdef CONFIG_FS_POSIX_ACL
54 * Get default acl EA only.
55 * Hold read_lock for mdd_obj.
57 int mdd_def_acl_get(const struct lu_env *env, struct mdd_object *mdd_obj,
64 if (ma->ma_valid & MA_ACL_DEF)
67 buf = mdd_buf_get(env, ma->ma_acl, ma->ma_acl_size);
68 rc = mdo_xattr_get(env, mdd_obj, buf, XATTR_NAME_ACL_DEFAULT,
72 ma->ma_valid |= MA_ACL_DEF;
74 } else if ((rc == -EOPNOTSUPP) || (rc == -ENODATA)) {
81 * Hold write_lock for o.
83 int mdd_acl_chmod(const struct lu_env *env, struct mdd_object *o, __u32 mode,
84 struct thandle *handle)
87 posix_acl_xattr_header *head;
88 posix_acl_xattr_entry *entry;
94 buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
95 sizeof(mdd_env_info(env)->mti_xattr_buf));
97 rc = mdo_xattr_get(env, o, buf, XATTR_NAME_ACL_ACCESS, BYPASS_CAPA);
98 if ((rc == -EOPNOTSUPP) || (rc == -ENODATA))
104 head = (posix_acl_xattr_header *)(buf->lb_buf);
105 entry = head->a_entries;
106 entry_count = (buf->lb_len - sizeof(head->a_version)) /
107 sizeof(posix_acl_xattr_entry);
108 if (entry_count <= 0)
111 rc = lustre_posix_acl_chmod_masq(entry, mode, entry_count);
115 rc = mdo_xattr_set(env, o, buf, XATTR_NAME_ACL_ACCESS,
116 0, handle, BYPASS_CAPA);
121 * Hold write_lock for obj.
123 int __mdd_acl_init(const struct lu_env *env, struct mdd_object *obj,
124 struct lu_buf *buf, __u32 *mode, struct thandle *handle)
126 posix_acl_xattr_header *head;
127 posix_acl_xattr_entry *entry;
133 head = (posix_acl_xattr_header *)(buf->lb_buf);
134 entry = head->a_entries;
135 entry_count = (buf->lb_len - sizeof(head->a_version)) /
136 sizeof(posix_acl_xattr_entry);
137 if (entry_count <= 0)
140 if (S_ISDIR(*mode)) {
141 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_DEFAULT, 0,
142 handle, BYPASS_CAPA);
147 rc = lustre_posix_acl_create_masq(entry, mode, entry_count);
151 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_ACCESS, 0, handle,
158 * Hold read_lock for obj.
160 static int mdd_check_acl(const struct lu_env *env, struct mdd_object *obj,
161 struct lu_attr *la, int mask)
163 #ifdef CONFIG_FS_POSIX_ACL
164 struct md_ucred *uc = md_ucred(env);
165 posix_acl_xattr_header *head;
166 posix_acl_xattr_entry *entry;
172 buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
173 sizeof(mdd_env_info(env)->mti_xattr_buf));
174 rc = mdo_xattr_get(env, obj, buf, XATTR_NAME_ACL_ACCESS,
175 mdd_object_capa(env, obj));
177 RETURN(rc ? : -EACCES);
180 head = (posix_acl_xattr_header *)(buf->lb_buf);
181 entry = head->a_entries;
182 entry_count = (buf->lb_len - sizeof(head->a_version)) /
183 sizeof(posix_acl_xattr_entry);
185 rc = lustre_posix_acl_permission(uc, la, mask, entry, entry_count);
193 int __mdd_permission_internal(const struct lu_env *env, struct mdd_object *obj,
194 struct lu_attr *la, int mask, int role)
196 struct md_ucred *uc = md_ucred(env);
204 /* These means unnecessary for permission check */
205 if ((uc == NULL) || (uc->mu_valid == UCRED_INIT))
208 /* Invalid user credit */
209 if (uc->mu_valid == UCRED_INVALID)
213 * Nobody gets write access to an immutable file.
215 if ((mask & MAY_WRITE) && mdd_is_immutable(obj))
219 la = &mdd_env_info(env)->mti_la;
220 rc = mdd_la_get(env, obj, la, BYPASS_CAPA);
226 if (uc->mu_fsuid == la->la_uid) {
229 if (mode & S_IRWXG) {
231 mdd_read_lock(env, obj, role);
232 rc = mdd_check_acl(env, obj, la, mask);
234 mdd_read_unlock(env, obj);
236 goto check_capabilities;
237 else if ((rc != -EAGAIN) && (rc != -EOPNOTSUPP) &&
241 if (lustre_in_group_p(uc, la->la_gid))
245 if (((mode & mask & S_IRWXO) == mask))
249 if (!(mask & MAY_EXEC) ||
250 (la->la_mode & S_IXUGO) || S_ISDIR(la->la_mode))
251 if (mdd_capable(uc, CFS_CAP_DAC_OVERRIDE))
254 if ((mask == MAY_READ) ||
255 (S_ISDIR(la->la_mode) && !(mask & MAY_WRITE)))
256 if (mdd_capable(uc, CFS_CAP_DAC_READ_SEARCH))
262 int mdd_permission(const struct lu_env *env,
263 struct md_object *pobj, struct md_object *cobj,
264 struct md_attr *ma, int mask)
266 struct mdd_object *mdd_pobj, *mdd_cobj;
267 struct md_ucred *uc = NULL;
268 struct lu_attr *la = NULL;
269 int check_create, check_link;
271 int check_rename_src, check_rename_tar;
272 int check_vtx_part, check_vtx_full;
278 mdd_cobj = md2mdd_obj(cobj);
280 /* For cross_open case, the "mask" is open flags,
281 * so convert it to permission mask first.
282 * XXX: MDS_OPEN_CROSS must be NOT equal to permission mask MAY_*. */
283 if (unlikely(mask & MDS_OPEN_CROSS)) {
284 la = &mdd_env_info(env)->mti_la;
285 rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
289 mask = accmode(env, la, mask & ~MDS_OPEN_CROSS);
292 check_create = mask & MAY_CREATE;
293 check_link = mask & MAY_LINK;
294 check_unlink = mask & MAY_UNLINK;
295 check_rename_src = mask & MAY_RENAME_SRC;
296 check_rename_tar = mask & MAY_RENAME_TAR;
297 check_vtx_part = mask & MAY_VTX_PART;
298 check_vtx_full = mask & MAY_VTX_FULL;
299 check_rgetfacl = mask & MAY_RGETFACL;
301 mask &= ~(MAY_CREATE | MAY_LINK |
303 MAY_RENAME_SRC | MAY_RENAME_TAR |
304 MAY_VTX_PART | MAY_VTX_FULL |
307 rc = mdd_permission_internal_locked(env, mdd_cobj, NULL, mask,
310 if (!rc && (check_create || check_link))
311 rc = mdd_may_create(env, mdd_cobj, NULL, 1, check_link);
313 if (!rc && check_unlink) {
315 rc = mdd_may_unlink(env, mdd_cobj, ma);
318 if (!rc && (check_rename_src || check_rename_tar)) {
321 mdd_pobj = md2mdd_obj(pobj);
322 rc = mdd_may_delete(env, mdd_pobj, mdd_cobj, ma, 1,
326 if (!rc && (check_vtx_part || check_vtx_full)) {
330 la = &mdd_env_info(env)->mti_la;
331 rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
336 if (!(la->la_mode & S_ISVTX) || (la->la_uid == uc->mu_fsuid) ||
337 (check_vtx_full && (ma->ma_attr.la_valid & LA_UID) &&
338 (ma->ma_attr.la_uid == uc->mu_fsuid))) {
339 ma->ma_attr_flags |= MDS_VTX_BYPASS;
341 ma->ma_attr_flags &= ~MDS_VTX_BYPASS;
347 if (unlikely(!rc && check_rgetfacl)) {
352 la = &mdd_env_info(env)->mti_la;
353 rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
358 if (la->la_uid != uc->mu_fsuid &&
359 !mdd_capable(uc, CFS_CAP_FOWNER))
366 int mdd_capa_get(const struct lu_env *env, struct md_object *obj,
367 struct lustre_capa *capa, int renewal)
369 struct mdd_object *mdd_obj = md2mdd_obj(obj);
374 oc = mdo_capa_get(env, mdd_obj, renewal ? capa : NULL,
378 } else if (likely(oc != NULL)) {