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.
30 * Copyright (c) 2012, 2014, 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);
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,
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 la->la_valid = LA_MODE;
140 rc = mdo_declare_attr_set(env, obj, la, handle);
143 rc = mdd_trans_start(env, mdd, handle);
147 mdd_write_lock(env, obj, MOR_TGT_CHILD);
148 /* whether ACL can be represented by i_mode only */
150 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_ACCESS, fl,
153 rc = mdo_xattr_del(env, obj, XATTR_NAME_ACL_ACCESS, handle);
158 rc = mdo_attr_set(env, obj, la, handle);
160 /* security-replated changes may require sync */
161 if (S_ISDIR(mdd_object_type(obj)))
162 handle->th_sync |= !!mdd->mdd_sync_permission;
164 mdd_write_unlock(env, obj);
166 mdd_trans_stop(env, mdd, rc, handle);
172 * Fix mode and ACL according to the default ACL(buf)
173 * \retval = 0 ACL does not need to be reset.
174 * \retval = 1 ACL needs to be reset.
177 int __mdd_fix_mode_acl(const struct lu_env *env, struct lu_buf *buf,
180 posix_acl_xattr_header *head;
181 posix_acl_xattr_entry *entry;
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);
191 if (entry_count <= 0)
194 rc = lustre_posix_acl_create_masq(entry, mode, entry_count);
202 * Hold read_lock for obj.
204 static int mdd_check_acl(const struct lu_env *env, struct mdd_object *obj,
205 const struct lu_attr *la, int mask)
207 #ifdef CONFIG_FS_POSIX_ACL
208 struct lu_ucred *uc = lu_ucred_assert(env);
209 posix_acl_xattr_header *head;
210 posix_acl_xattr_entry *entry;
216 buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
217 sizeof(mdd_env_info(env)->mti_xattr_buf));
218 rc = mdo_xattr_get(env, obj, buf, XATTR_NAME_ACL_ACCESS);
220 RETURN(rc ? : -EACCES);
223 head = (posix_acl_xattr_header *)(buf->lb_buf);
224 entry = head->a_entries;
225 entry_count = posix_acl_xattr_count(buf->lb_len);
227 /* Disregard empty ACLs and fall back to
228 * standard UNIX permissions. See LU-5434 */
229 if (entry_count <= 0)
232 rc = lustre_posix_acl_permission(uc, la, mask, entry, entry_count);
240 int __mdd_permission_internal(const struct lu_env *env, struct mdd_object *obj,
241 const struct lu_attr *la, int mask, int role)
243 struct lu_ucred *uc = lu_ucred(env);
251 /* These means unnecessary for permission check */
252 if ((uc == NULL) || (uc->uc_valid == UCRED_INIT))
255 /* Invalid user credit */
256 if (uc->uc_valid == UCRED_INVALID)
260 * Nobody gets write access to an immutable file.
262 if (mask & MAY_WRITE && la->la_flags & LUSTRE_IMMUTABLE_FL)
268 if (uc->uc_fsuid == la->la_uid) {
271 if (mode & S_IRWXG) {
273 mdd_read_lock(env, obj, role);
274 rc = mdd_check_acl(env, obj, la, mask);
276 mdd_read_unlock(env, obj);
278 goto check_capabilities;
279 else if ((rc != -EAGAIN) && (rc != -EOPNOTSUPP) &&
283 if (lustre_in_group_p(uc, la->la_gid))
287 if (((mode & mask & S_IRWXO) == mask))
291 if (!(mask & MAY_EXEC) ||
292 (la->la_mode & S_IXUGO) || S_ISDIR(la->la_mode))
293 if (md_capable(uc, CFS_CAP_DAC_OVERRIDE))
296 if ((mask == MAY_READ) ||
297 (S_ISDIR(la->la_mode) && !(mask & MAY_WRITE)))
298 if (md_capable(uc, CFS_CAP_DAC_READ_SEARCH))
301 CDEBUG(D_SEC, "permission denied, mode %x, fsuid %u, uid %u\n",
302 la->la_mode, uc->uc_fsuid, la->la_uid);
307 int mdd_permission(const struct lu_env *env,
308 struct md_object *pobj, struct md_object *cobj,
309 struct md_attr *ma, int mask)
311 struct mdd_object *mdd_pobj = NULL;
312 struct mdd_object *mdd_cobj;
313 struct lu_ucred *uc = NULL;
314 struct lu_attr *pattr = NULL;
315 struct lu_attr *cattr = MDD_ENV_VAR(env, cattr);
319 int check_rename_src, check_rename_tar;
320 int check_vtx_part, check_vtx_full;
327 mdd_pobj = md2mdd_obj(pobj);
328 pattr = MDD_ENV_VAR(env, pattr);
329 rc = mdd_la_get(env, mdd_pobj, pattr);
334 mdd_cobj = md2mdd_obj(cobj);
335 rc = mdd_la_get(env, mdd_cobj, cattr);
339 /* For cross_open case, the "mask" is open flags,
340 * so convert it to permission mask first.
341 * XXX: MDS_OPEN_CROSS must be NOT equal to permission mask MAY_*. */
342 if (unlikely(mask & MDS_OPEN_CROSS))
343 mask = accmode(env, cattr, mask & ~MDS_OPEN_CROSS);
345 check_create = mask & MAY_CREATE;
346 check_link = mask & MAY_LINK;
347 check_unlink = mask & MAY_UNLINK;
348 check_rename_src = mask & MAY_RENAME_SRC;
349 check_rename_tar = mask & MAY_RENAME_TAR;
350 check_vtx_part = mask & MAY_VTX_PART;
351 check_vtx_full = mask & MAY_VTX_FULL;
352 check_rgetfacl = mask & MAY_RGETFACL;
354 mask &= ~(MAY_CREATE | MAY_LINK |
356 MAY_RENAME_SRC | MAY_RENAME_TAR |
357 MAY_VTX_PART | MAY_VTX_FULL |
360 rc = mdd_permission_internal_locked(env, mdd_cobj, cattr, mask,
363 if (!rc && check_create)
364 rc = mdd_may_create(env, mdd_pobj, pattr, mdd_cobj, true);
366 if (!rc && check_unlink)
367 rc = mdd_may_unlink(env, mdd_pobj, pattr, cattr);
369 if (!rc && (check_rename_src || check_rename_tar))
370 rc = mdd_may_delete(env, mdd_pobj, pattr, mdd_cobj, cattr, NULL,
371 1, check_rename_tar);
373 if (!rc && (check_vtx_part || check_vtx_full)) {
374 uc = lu_ucred_assert(env);
376 if (!(cattr->la_mode & S_ISVTX) ||
377 (cattr->la_uid == uc->uc_fsuid) ||
378 (check_vtx_full && (ma->ma_attr.la_valid & LA_UID) &&
379 (ma->ma_attr.la_uid == uc->uc_fsuid))) {
380 ma->ma_attr_flags |= MDS_VTX_BYPASS;
382 ma->ma_attr_flags &= ~MDS_VTX_BYPASS;
388 if (unlikely(!rc && check_rgetfacl)) {
390 uc = lu_ucred_assert(env);
392 if (cattr->la_uid != uc->uc_fsuid &&
393 !md_capable(uc, CFS_CAP_FOWNER))