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,
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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).
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17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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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.
30 * Copyright (c) 2012, 2013, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/mdd/mdd_permission.c
38 * Lustre Metadata Server (mdd) routines
40 * Author: fangyong@clusterfs.com
41 * Author: lsy@clusterfs.com
44 #define DEBUG_SUBSYSTEM S_MDS
46 #include <obd_class.h>
47 #include <lustre_ver.h>
48 #include <lprocfs_status.h>
49 #include <lustre_mds.h>
50 #include <lustre_idmap.h>
51 #include "mdd_internal.h"
53 #ifdef CONFIG_FS_POSIX_ACL
56 * Hold write_lock for o.
58 int mdd_acl_chmod(const struct lu_env *env, struct mdd_object *o, __u32 mode,
59 struct thandle *handle)
62 posix_acl_xattr_header *head;
63 posix_acl_xattr_entry *entry;
69 buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
70 sizeof(mdd_env_info(env)->mti_xattr_buf));
72 rc = mdo_xattr_get(env, o, buf, XATTR_NAME_ACL_ACCESS, BYPASS_CAPA);
73 if ((rc == -EOPNOTSUPP) || (rc == -ENODATA))
79 head = (posix_acl_xattr_header *)(buf->lb_buf);
80 entry = head->a_entries;
81 entry_count = (buf->lb_len - sizeof(head->a_version)) /
82 sizeof(posix_acl_xattr_entry);
86 rc = lustre_posix_acl_chmod_masq(entry, mode, entry_count);
90 rc = mdo_xattr_set(env, o, buf, XATTR_NAME_ACL_ACCESS,
91 0, handle, BYPASS_CAPA);
95 int mdd_acl_set(const struct lu_env *env, struct mdd_object *obj,
96 struct lu_attr *la, const struct lu_buf *buf, int fl)
98 struct mdd_device *mdd = mdd_obj2mdd_dev(obj);
99 struct thandle *handle;
100 posix_acl_xattr_header *head;
101 posix_acl_xattr_entry *entry;
103 bool not_equiv, mode_change;
107 head = (posix_acl_xattr_header *)(buf->lb_buf);
108 entry = head->a_entries;
109 entry_count = (buf->lb_len - sizeof(head->a_version)) /
110 sizeof(posix_acl_xattr_entry);
111 if (entry_count <= 0)
114 LASSERT(la->la_valid & LA_MODE);
116 rc = lustre_posix_acl_equiv_mode(entry, &mode, entry_count);
120 not_equiv = (rc > 0);
121 mode_change = (mode != la->la_mode);
123 handle = mdd_trans_create(env, mdd);
125 RETURN(PTR_ERR(handle));
127 /* rc tells whether ACL can be represented by i_mode only */
129 rc = mdo_declare_xattr_set(env, obj, buf,
130 XATTR_NAME_ACL_ACCESS, fl, handle);
132 rc = mdo_declare_xattr_del(env, obj, XATTR_NAME_ACL_ACCESS,
139 rc = mdo_declare_attr_set(env, obj, la, handle);
142 rc = mdd_trans_start(env, mdd, handle);
146 mdd_write_lock(env, obj, MOR_TGT_CHILD);
147 /* whether ACL can be represented by i_mode only */
149 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_ACCESS, fl,
150 handle, mdd_object_capa(env, obj));
152 rc = mdo_xattr_del(env, obj, XATTR_NAME_ACL_ACCESS, handle,
153 mdd_object_capa(env, obj));
158 rc = mdo_attr_set(env, obj, la, handle,
159 mdd_object_capa(env, obj));
161 /* security-replated changes may require sync */
162 if (S_ISDIR(mdd_object_type(obj)))
163 handle->th_sync |= !!mdd->mdd_sync_permission;
165 mdd_write_unlock(env, obj);
167 mdd_trans_stop(env, mdd, rc, handle);
173 * Fix mode and ACL according to the default ACL(buf)
174 * \retval = 0 ACL does not need to be reset.
175 * \retval = 1 ACL needs to be reset.
178 int __mdd_fix_mode_acl(const struct lu_env *env, struct lu_buf *buf,
181 posix_acl_xattr_header *head;
182 posix_acl_xattr_entry *entry;
188 head = (posix_acl_xattr_header *)(buf->lb_buf);
189 entry = head->a_entries;
190 entry_count = (buf->lb_len - sizeof(head->a_version)) /
191 sizeof(posix_acl_xattr_entry);
192 if (entry_count <= 0)
195 rc = lustre_posix_acl_create_masq(entry, mode, entry_count);
203 * Hold read_lock for obj.
205 static int mdd_check_acl(const struct lu_env *env, struct mdd_object *obj,
206 const struct lu_attr *la, int mask)
208 #ifdef CONFIG_FS_POSIX_ACL
209 struct lu_ucred *uc = lu_ucred_assert(env);
210 posix_acl_xattr_header *head;
211 posix_acl_xattr_entry *entry;
217 buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
218 sizeof(mdd_env_info(env)->mti_xattr_buf));
219 rc = mdo_xattr_get(env, obj, buf, XATTR_NAME_ACL_ACCESS,
220 mdd_object_capa(env, obj));
222 RETURN(rc ? : -EACCES);
225 head = (posix_acl_xattr_header *)(buf->lb_buf);
226 entry = head->a_entries;
227 entry_count = (buf->lb_len - sizeof(head->a_version)) /
228 sizeof(posix_acl_xattr_entry);
230 rc = lustre_posix_acl_permission(uc, la, mask, entry, entry_count);
238 int __mdd_permission_internal(const struct lu_env *env, struct mdd_object *obj,
239 const struct lu_attr *la, int mask, int role)
241 struct lu_ucred *uc = lu_ucred(env);
249 /* These means unnecessary for permission check */
250 if ((uc == NULL) || (uc->uc_valid == UCRED_INIT))
253 /* Invalid user credit */
254 if (uc->uc_valid == UCRED_INVALID)
258 * Nobody gets write access to an immutable file.
260 if ((mask & MAY_WRITE) && mdd_is_immutable(obj))
266 if (uc->uc_fsuid == la->la_uid) {
269 if (mode & S_IRWXG) {
271 mdd_read_lock(env, obj, role);
272 rc = mdd_check_acl(env, obj, la, mask);
274 mdd_read_unlock(env, obj);
276 goto check_capabilities;
277 else if ((rc != -EAGAIN) && (rc != -EOPNOTSUPP) &&
281 if (lustre_in_group_p(uc, la->la_gid))
285 if (((mode & mask & S_IRWXO) == mask))
289 if (!(mask & MAY_EXEC) ||
290 (la->la_mode & S_IXUGO) || S_ISDIR(la->la_mode))
291 if (md_capable(uc, CFS_CAP_DAC_OVERRIDE))
294 if ((mask == MAY_READ) ||
295 (S_ISDIR(la->la_mode) && !(mask & MAY_WRITE)))
296 if (md_capable(uc, CFS_CAP_DAC_READ_SEARCH))
302 int mdd_permission(const struct lu_env *env,
303 struct md_object *pobj, struct md_object *cobj,
304 struct md_attr *ma, int mask)
306 struct mdd_object *mdd_pobj = NULL;
307 struct mdd_object *mdd_cobj;
308 struct lu_ucred *uc = NULL;
309 struct lu_attr *pattr = NULL;
310 struct lu_attr *cattr = MDD_ENV_VAR(env, cattr);
311 int check_create, check_link;
313 int check_rename_src, check_rename_tar;
314 int check_vtx_part, check_vtx_full;
321 mdd_pobj = md2mdd_obj(pobj);
322 pattr = MDD_ENV_VAR(env, pattr);
323 rc = mdd_la_get(env, mdd_pobj, pattr, BYPASS_CAPA);
328 mdd_cobj = md2mdd_obj(cobj);
329 rc = mdd_la_get(env, mdd_cobj, cattr, BYPASS_CAPA);
333 /* For cross_open case, the "mask" is open flags,
334 * so convert it to permission mask first.
335 * XXX: MDS_OPEN_CROSS must be NOT equal to permission mask MAY_*. */
336 if (unlikely(mask & MDS_OPEN_CROSS))
337 mask = accmode(env, cattr, mask & ~MDS_OPEN_CROSS);
339 check_create = mask & MAY_CREATE;
340 check_link = mask & MAY_LINK;
341 check_unlink = mask & MAY_UNLINK;
342 check_rename_src = mask & MAY_RENAME_SRC;
343 check_rename_tar = mask & MAY_RENAME_TAR;
344 check_vtx_part = mask & MAY_VTX_PART;
345 check_vtx_full = mask & MAY_VTX_FULL;
346 check_rgetfacl = mask & MAY_RGETFACL;
348 mask &= ~(MAY_CREATE | MAY_LINK |
350 MAY_RENAME_SRC | MAY_RENAME_TAR |
351 MAY_VTX_PART | MAY_VTX_FULL |
354 rc = mdd_permission_internal_locked(env, mdd_cobj, cattr, mask,
357 if (!rc && (check_create || check_link))
358 rc = mdd_may_create(env, mdd_pobj, pattr, mdd_cobj, 1,
361 if (!rc && check_unlink)
362 rc = mdd_may_unlink(env, mdd_pobj, pattr, cattr);
364 if (!rc && (check_rename_src || check_rename_tar))
365 rc = mdd_may_delete(env, mdd_pobj, pattr, mdd_cobj, cattr, NULL,
366 1, check_rename_tar);
368 if (!rc && (check_vtx_part || check_vtx_full)) {
369 uc = lu_ucred_assert(env);
371 if (!(cattr->la_mode & S_ISVTX) ||
372 (cattr->la_uid == uc->uc_fsuid) ||
373 (check_vtx_full && (ma->ma_attr.la_valid & LA_UID) &&
374 (ma->ma_attr.la_uid == uc->uc_fsuid))) {
375 ma->ma_attr_flags |= MDS_VTX_BYPASS;
377 ma->ma_attr_flags &= ~MDS_VTX_BYPASS;
383 if (unlikely(!rc && check_rgetfacl)) {
385 uc = lu_ucred_assert(env);
387 if (cattr->la_uid != uc->uc_fsuid &&
388 !md_capable(uc, CFS_CAP_FOWNER))
395 int mdd_capa_get(const struct lu_env *env, struct md_object *obj,
396 struct lustre_capa *capa, int renewal)
398 struct mdd_object *mdd_obj = md2mdd_obj(obj);
403 oc = mdo_capa_get(env, mdd_obj, renewal ? capa : NULL,
407 } else if (likely(oc != NULL)) {