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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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11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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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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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.
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 * Hold write_lock for o.
56 int mdd_acl_chmod(const struct lu_env *env, struct mdd_object *o, __u32 mode,
57 struct thandle *handle)
60 posix_acl_xattr_header *head;
61 posix_acl_xattr_entry *entry;
67 buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
68 sizeof(mdd_env_info(env)->mti_xattr_buf));
70 rc = mdo_xattr_get(env, o, buf, XATTR_NAME_ACL_ACCESS, BYPASS_CAPA);
71 if ((rc == -EOPNOTSUPP) || (rc == -ENODATA))
77 head = (posix_acl_xattr_header *)(buf->lb_buf);
78 entry = head->a_entries;
79 entry_count = (buf->lb_len - sizeof(head->a_version)) /
80 sizeof(posix_acl_xattr_entry);
84 rc = lustre_posix_acl_chmod_masq(entry, mode, entry_count);
88 rc = mdo_xattr_set(env, o, buf, XATTR_NAME_ACL_ACCESS,
89 0, handle, BYPASS_CAPA);
93 int mdd_acl_set(const struct lu_env *env, struct mdd_object *obj,
94 const struct lu_buf *buf, int fl)
96 struct mdd_device *mdd = mdd_obj2mdd_dev(obj);
97 struct lu_attr *la = &mdd_env_info(env)->mti_la;
98 struct thandle *handle;
99 posix_acl_xattr_header *head;
100 posix_acl_xattr_entry *entry;
102 bool not_equiv, mode_change;
106 rc = mdd_la_get(env, obj, la, BYPASS_CAPA);
110 head = (posix_acl_xattr_header *)(buf->lb_buf);
111 entry = head->a_entries;
112 entry_count = (buf->lb_len - sizeof(head->a_version)) /
113 sizeof(posix_acl_xattr_entry);
114 if (entry_count <= 0)
117 LASSERT(la->la_valid & LA_MODE);
119 rc = lustre_posix_acl_equiv_mode(entry, &mode, entry_count);
123 not_equiv = (rc > 0);
124 mode_change = (mode != la->la_mode);
126 handle = mdd_trans_create(env, mdd);
128 RETURN(PTR_ERR(handle));
130 /* rc tells whether ACL can be represented by i_mode only */
132 rc = mdo_declare_xattr_set(env, obj, buf,
133 XATTR_NAME_ACL_ACCESS, fl, handle);
135 rc = mdo_declare_xattr_del(env, obj, XATTR_NAME_ACL_ACCESS,
142 rc = mdo_declare_attr_set(env, obj, la, handle);
145 rc = mdd_trans_start(env, mdd, handle);
149 mdd_write_lock(env, obj, MOR_TGT_CHILD);
150 /* whether ACL can be represented by i_mode only */
152 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_ACCESS, fl,
153 handle, mdd_object_capa(env, obj));
155 rc = mdo_xattr_del(env, obj, XATTR_NAME_ACL_ACCESS, handle,
156 mdd_object_capa(env, obj));
161 rc = mdo_attr_set(env, obj, la, handle,
162 mdd_object_capa(env, obj));
164 /* security-replated changes may require sync */
165 handle->th_sync |= !!mdd->mdd_sync_permission;
167 mdd_write_unlock(env, obj);
169 mdd_trans_stop(env, mdd, rc, handle);
175 * Hold write_lock for obj.
177 int __mdd_acl_init(const struct lu_env *env, struct mdd_object *obj,
178 struct lu_buf *buf, __u32 *mode, struct thandle *handle)
180 posix_acl_xattr_header *head;
181 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 if (S_ISDIR(*mode)) {
196 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_DEFAULT, 0,
197 handle, BYPASS_CAPA);
202 rc = lustre_posix_acl_create_masq(entry, mode, entry_count);
206 /* part of ACL went into i_mode */
208 struct mdd_thread_info *info = mdd_env_info(env);
209 struct lu_attr *pattr = &info->mti_pattr;
211 /* mode was initialized within object creation,
212 * so we need explict ->attr_set() to update it */
213 pattr->la_valid = LA_MODE;
214 pattr->la_mode = *mode;
215 rc2 = mdo_attr_set(env, obj, pattr, handle, BYPASS_CAPA);
221 rc = mdo_xattr_set(env, obj, buf, XATTR_NAME_ACL_ACCESS, 0,
222 handle, BYPASS_CAPA);
228 * Hold read_lock for obj.
230 static int mdd_check_acl(const struct lu_env *env, struct mdd_object *obj,
231 struct lu_attr *la, int mask)
233 #ifdef CONFIG_FS_POSIX_ACL
234 struct md_ucred *uc = md_ucred(env);
235 posix_acl_xattr_header *head;
236 posix_acl_xattr_entry *entry;
242 buf = mdd_buf_get(env, mdd_env_info(env)->mti_xattr_buf,
243 sizeof(mdd_env_info(env)->mti_xattr_buf));
244 rc = mdo_xattr_get(env, obj, buf, XATTR_NAME_ACL_ACCESS,
245 mdd_object_capa(env, obj));
247 RETURN(rc ? : -EACCES);
250 head = (posix_acl_xattr_header *)(buf->lb_buf);
251 entry = head->a_entries;
252 entry_count = (buf->lb_len - sizeof(head->a_version)) /
253 sizeof(posix_acl_xattr_entry);
255 rc = lustre_posix_acl_permission(uc, la, mask, entry, entry_count);
263 int __mdd_permission_internal(const struct lu_env *env, struct mdd_object *obj,
264 struct lu_attr *la, int mask, int role)
266 struct md_ucred *uc = md_ucred(env);
274 /* These means unnecessary for permission check */
275 if ((uc == NULL) || (uc->mu_valid == UCRED_INIT))
278 /* Invalid user credit */
279 if (uc->mu_valid == UCRED_INVALID)
283 * Nobody gets write access to an immutable file.
285 if ((mask & MAY_WRITE) && mdd_is_immutable(obj))
289 la = &mdd_env_info(env)->mti_la;
290 rc = mdd_la_get(env, obj, la, BYPASS_CAPA);
296 if (uc->mu_fsuid == la->la_uid) {
299 if (mode & S_IRWXG) {
301 mdd_read_lock(env, obj, role);
302 rc = mdd_check_acl(env, obj, la, mask);
304 mdd_read_unlock(env, obj);
306 goto check_capabilities;
307 else if ((rc != -EAGAIN) && (rc != -EOPNOTSUPP) &&
311 if (lustre_in_group_p(uc, la->la_gid))
315 if (((mode & mask & S_IRWXO) == mask))
319 if (!(mask & MAY_EXEC) ||
320 (la->la_mode & S_IXUGO) || S_ISDIR(la->la_mode))
321 if (mdd_capable(uc, CFS_CAP_DAC_OVERRIDE))
324 if ((mask == MAY_READ) ||
325 (S_ISDIR(la->la_mode) && !(mask & MAY_WRITE)))
326 if (mdd_capable(uc, CFS_CAP_DAC_READ_SEARCH))
332 int mdd_permission(const struct lu_env *env,
333 struct md_object *pobj, struct md_object *cobj,
334 struct md_attr *ma, int mask)
336 struct mdd_object *mdd_pobj, *mdd_cobj;
337 struct md_ucred *uc = NULL;
338 struct lu_attr *la = &mdd_env_info(env)->mti_cattr;
339 int check_create, check_link;
341 int check_rename_src, check_rename_tar;
342 int check_vtx_part, check_vtx_full;
348 mdd_cobj = md2mdd_obj(cobj);
350 rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
354 /* For cross_open case, the "mask" is open flags,
355 * so convert it to permission mask first.
356 * XXX: MDS_OPEN_CROSS must be NOT equal to permission mask MAY_*. */
357 if (unlikely(mask & MDS_OPEN_CROSS))
358 mask = accmode(env, la, mask & ~MDS_OPEN_CROSS);
360 check_create = mask & MAY_CREATE;
361 check_link = mask & MAY_LINK;
362 check_unlink = mask & MAY_UNLINK;
363 check_rename_src = mask & MAY_RENAME_SRC;
364 check_rename_tar = mask & MAY_RENAME_TAR;
365 check_vtx_part = mask & MAY_VTX_PART;
366 check_vtx_full = mask & MAY_VTX_FULL;
367 check_rgetfacl = mask & MAY_RGETFACL;
369 mask &= ~(MAY_CREATE | MAY_LINK |
371 MAY_RENAME_SRC | MAY_RENAME_TAR |
372 MAY_VTX_PART | MAY_VTX_FULL |
375 rc = mdd_permission_internal_locked(env, mdd_cobj, NULL, mask,
378 if (!rc && (check_create || check_link))
379 rc = mdd_may_create(env, mdd_cobj, NULL, 1, check_link);
381 if (!rc && check_unlink)
382 rc = mdd_may_unlink(env, mdd_cobj, la);
384 if (!rc && (check_rename_src || check_rename_tar)) {
386 mdd_pobj = md2mdd_obj(pobj);
387 rc = mdd_may_delete(env, mdd_pobj, mdd_cobj, la, NULL, 1,
391 if (!rc && (check_vtx_part || check_vtx_full)) {
394 la = &mdd_env_info(env)->mti_la;
395 rc = mdd_la_get(env, mdd_cobj, la, BYPASS_CAPA);
400 if (!(la->la_mode & S_ISVTX) || (la->la_uid == uc->mu_fsuid) ||
401 (check_vtx_full && (ma->ma_attr.la_valid & LA_UID) &&
402 (ma->ma_attr.la_uid == uc->mu_fsuid))) {
403 ma->ma_attr_flags |= MDS_VTX_BYPASS;
405 ma->ma_attr_flags &= ~MDS_VTX_BYPASS;
411 if (unlikely(!rc && check_rgetfacl)) {
415 if (la->la_uid != uc->mu_fsuid &&
416 !mdd_capable(uc, CFS_CAP_FOWNER))
423 int mdd_capa_get(const struct lu_env *env, struct md_object *obj,
424 struct lustre_capa *capa, int renewal)
426 struct mdd_object *mdd_obj = md2mdd_obj(obj);
431 oc = mdo_capa_get(env, mdd_obj, renewal ? capa : NULL,
435 } else if (likely(oc != NULL)) {