2 Unix SMB/CIFS implementation.
4 POSIX NTVFS backend - xattr support
6 Copyright (C) Andrew Tridgell 2004
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "vfs_posix.h"
24 #include "lib/util/unix_privs.h"
25 #include "librpc/gen_ndr/ndr_xattr.h"
26 #include "param/param.h"
29 pull a xattr as a blob
31 static NTSTATUS pull_xattr_blob(struct pvfs_state *pvfs,
33 const char *attr_name,
36 size_t estimated_size,
42 return pull_xattr_blob_tdb(pvfs, mem_ctx, attr_name, fname,
43 fd, estimated_size, blob);
46 status = pull_xattr_blob_system(pvfs, mem_ctx, attr_name, fname,
47 fd, estimated_size, blob);
49 /* if the filesystem doesn't support them, then tell pvfs not to try again */
50 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)||
51 NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)||
52 NT_STATUS_EQUAL(status, NT_STATUS_INVALID_SYSTEM_SERVICE)) {
53 DEBUG(5,("pvfs_xattr: xattr not supported in filesystem: %s\n", nt_errstr(status)));
54 pvfs->flags &= ~PVFS_FLAG_XATTR_ENABLE;
55 status = NT_STATUS_NOT_FOUND;
62 push a xattr as a blob
64 static NTSTATUS push_xattr_blob(struct pvfs_state *pvfs,
65 const char *attr_name,
68 const DATA_BLOB *blob)
71 return push_xattr_blob_tdb(pvfs, attr_name, fname, fd, blob);
73 return push_xattr_blob_system(pvfs, attr_name, fname, fd, blob);
80 static NTSTATUS delete_xattr(struct pvfs_state *pvfs, const char *attr_name,
81 const char *fname, int fd)
84 return delete_xattr_tdb(pvfs, attr_name, fname, fd);
86 return delete_xattr_system(pvfs, attr_name, fname, fd);
90 a hook called on unlink - allows the tdb xattr backend to cleanup
92 NTSTATUS pvfs_xattr_unlink_hook(struct pvfs_state *pvfs, const char *fname)
95 return unlink_xattr_tdb(pvfs, fname);
97 return unlink_xattr_system(pvfs, fname);
102 load a NDR structure from a xattr
104 _PUBLIC_ NTSTATUS pvfs_xattr_ndr_load(struct pvfs_state *pvfs,
106 const char *fname, int fd, const char *attr_name,
107 void *p, void *pull_fn)
111 enum ndr_err_code ndr_err;
113 status = pull_xattr_blob(pvfs, mem_ctx, attr_name, fname,
114 fd, XATTR_DOSATTRIB_ESTIMATED_SIZE, &blob);
115 if (!NT_STATUS_IS_OK(status)) {
120 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, p, (ndr_pull_flags_fn_t)pull_fn);
121 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
122 return ndr_map_error2ntstatus(ndr_err);
125 data_blob_free(&blob);
131 save a NDR structure into a xattr
133 _PUBLIC_ NTSTATUS pvfs_xattr_ndr_save(struct pvfs_state *pvfs,
134 const char *fname, int fd, const char *attr_name,
135 void *p, void *push_fn)
137 TALLOC_CTX *mem_ctx = talloc_new(NULL);
140 enum ndr_err_code ndr_err;
142 ndr_err = ndr_push_struct_blob(&blob, mem_ctx, lp_iconv_convenience(global_loadparm), p, (ndr_push_flags_fn_t)push_fn);
143 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
144 talloc_free(mem_ctx);
145 return ndr_map_error2ntstatus(ndr_err);
148 status = push_xattr_blob(pvfs, attr_name, fname, fd, &blob);
149 talloc_free(mem_ctx);
156 fill in file attributes from extended attributes
158 NTSTATUS pvfs_dosattrib_load(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd)
161 struct xattr_DosAttrib attrib;
162 TALLOC_CTX *mem_ctx = talloc_new(name);
163 struct xattr_DosInfo1 *info1;
164 struct xattr_DosInfo2 *info2;
166 if (name->stream_name != NULL) {
167 name->stream_exists = false;
169 name->stream_exists = true;
172 if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
176 status = pvfs_xattr_ndr_load(pvfs, mem_ctx, name->full_name,
177 fd, XATTR_DOSATTRIB_NAME,
179 (ndr_pull_flags_fn_t)ndr_pull_xattr_DosAttrib);
181 /* not having a DosAttrib is not an error */
182 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
183 talloc_free(mem_ctx);
184 return pvfs_stream_info(pvfs, name, fd);
187 if (!NT_STATUS_IS_OK(status)) {
188 talloc_free(mem_ctx);
192 switch (attrib.version) {
194 info1 = &attrib.info.info1;
195 name->dos.attrib = pvfs_attrib_normalise(info1->attrib,
197 name->dos.ea_size = info1->ea_size;
198 if (name->st.st_size == info1->size) {
199 name->dos.alloc_size =
200 pvfs_round_alloc_size(pvfs, info1->alloc_size);
202 if (!null_nttime(info1->create_time)) {
203 name->dos.create_time = info1->create_time;
205 if (!null_nttime(info1->change_time)) {
206 name->dos.change_time = info1->change_time;
212 info2 = &attrib.info.info2;
213 name->dos.attrib = pvfs_attrib_normalise(info2->attrib,
215 name->dos.ea_size = info2->ea_size;
216 if (name->st.st_size == info2->size) {
217 name->dos.alloc_size =
218 pvfs_round_alloc_size(pvfs, info2->alloc_size);
220 if (!null_nttime(info2->create_time)) {
221 name->dos.create_time = info2->create_time;
223 if (!null_nttime(info2->change_time)) {
224 name->dos.change_time = info2->change_time;
226 name->dos.flags = info2->flags;
227 if (name->dos.flags & XATTR_ATTRIB_FLAG_STICKY_WRITE_TIME) {
228 name->dos.write_time = info2->write_time;
233 DEBUG(0,("ERROR: Unsupported xattr DosAttrib version %d on '%s'\n",
234 attrib.version, name->full_name));
235 talloc_free(mem_ctx);
236 return NT_STATUS_INVALID_LEVEL;
238 talloc_free(mem_ctx);
240 status = pvfs_stream_info(pvfs, name, fd);
247 save the file attribute into the xattr
249 NTSTATUS pvfs_dosattrib_save(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd)
251 struct xattr_DosAttrib attrib;
252 struct xattr_DosInfo2 *info2;
254 if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
259 info2 = &attrib.info.info2;
261 name->dos.attrib = pvfs_attrib_normalise(name->dos.attrib, name->st.st_mode);
263 info2->attrib = name->dos.attrib;
264 info2->ea_size = name->dos.ea_size;
265 info2->size = name->st.st_size;
266 info2->alloc_size = name->dos.alloc_size;
267 info2->create_time = name->dos.create_time;
268 info2->change_time = name->dos.change_time;
269 info2->write_time = name->dos.write_time;
270 info2->flags = name->dos.flags;
273 return pvfs_xattr_ndr_save(pvfs, name->full_name, fd,
274 XATTR_DOSATTRIB_NAME, &attrib,
275 (ndr_push_flags_fn_t)ndr_push_xattr_DosAttrib);
280 load the set of DOS EAs
282 NTSTATUS pvfs_doseas_load(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
283 struct xattr_DosEAs *eas)
287 if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
290 status = pvfs_xattr_ndr_load(pvfs, eas, name->full_name, fd, XATTR_DOSEAS_NAME,
291 eas, (ndr_pull_flags_fn_t)ndr_pull_xattr_DosEAs);
292 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
299 save the set of DOS EAs
301 NTSTATUS pvfs_doseas_save(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
302 struct xattr_DosEAs *eas)
304 if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
307 return pvfs_xattr_ndr_save(pvfs, name->full_name, fd, XATTR_DOSEAS_NAME, eas,
308 (ndr_push_flags_fn_t)ndr_push_xattr_DosEAs);
313 load the set of streams from extended attributes
315 NTSTATUS pvfs_streams_load(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
316 struct xattr_DosStreams *streams)
319 ZERO_STRUCTP(streams);
320 if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
323 status = pvfs_xattr_ndr_load(pvfs, streams, name->full_name, fd,
324 XATTR_DOSSTREAMS_NAME,
326 (ndr_pull_flags_fn_t)ndr_pull_xattr_DosStreams);
327 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
334 save the set of streams into filesystem xattr
336 NTSTATUS pvfs_streams_save(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
337 struct xattr_DosStreams *streams)
339 if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
342 return pvfs_xattr_ndr_save(pvfs, name->full_name, fd,
343 XATTR_DOSSTREAMS_NAME,
345 (ndr_push_flags_fn_t)ndr_push_xattr_DosStreams);
350 load the current ACL from extended attributes
352 NTSTATUS pvfs_acl_load(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
353 struct xattr_NTACL *acl)
357 if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
358 return NT_STATUS_NOT_FOUND;
360 status = pvfs_xattr_ndr_load(pvfs, acl, name->full_name, fd,
363 (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
368 save the acl for a file into filesystem xattr
370 NTSTATUS pvfs_acl_save(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
371 struct xattr_NTACL *acl)
376 if (!(pvfs->flags & PVFS_FLAG_XATTR_ENABLE)) {
380 /* this xattr is in the "system" namespace, so we need
381 admin privileges to set it */
382 privs = root_privileges();
383 status = pvfs_xattr_ndr_save(pvfs, name->full_name, fd,
386 (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
392 create a zero length xattr with the given name
394 NTSTATUS pvfs_xattr_create(struct pvfs_state *pvfs,
395 const char *fname, int fd,
396 const char *attr_prefix,
397 const char *attr_name)
400 DATA_BLOB blob = data_blob(NULL, 0);
401 char *aname = talloc_asprintf(NULL, "%s%s", attr_prefix, attr_name);
403 return NT_STATUS_NO_MEMORY;
405 status = push_xattr_blob(pvfs, aname, fname, fd, &blob);
412 delete a xattr with the given name
414 NTSTATUS pvfs_xattr_delete(struct pvfs_state *pvfs,
415 const char *fname, int fd,
416 const char *attr_prefix,
417 const char *attr_name)
420 char *aname = talloc_asprintf(NULL, "%s%s", attr_prefix, attr_name);
422 return NT_STATUS_NO_MEMORY;
424 status = delete_xattr(pvfs, aname, fname, fd);
430 load a xattr with the given name
432 NTSTATUS pvfs_xattr_load(struct pvfs_state *pvfs,
434 const char *fname, int fd,
435 const char *attr_prefix,
436 const char *attr_name,
437 size_t estimated_size,
441 char *aname = talloc_asprintf(mem_ctx, "%s%s", attr_prefix, attr_name);
443 return NT_STATUS_NO_MEMORY;
445 status = pull_xattr_blob(pvfs, mem_ctx, aname, fname, fd, estimated_size, blob);
451 save a xattr with the given name
453 NTSTATUS pvfs_xattr_save(struct pvfs_state *pvfs,
454 const char *fname, int fd,
455 const char *attr_prefix,
456 const char *attr_name,
457 const DATA_BLOB *blob)
460 char *aname = talloc_asprintf(NULL, "%s%s", attr_prefix, attr_name);
462 return NT_STATUS_NO_MEMORY;
464 status = push_xattr_blob(pvfs, aname, fname, fd, blob);
471 probe for system support for xattrs
473 void pvfs_xattr_probe(struct pvfs_state *pvfs)
475 TALLOC_CTX *tmp_ctx = talloc_new(pvfs);
477 pull_xattr_blob(pvfs, tmp_ctx, "user.XattrProbe", pvfs->base_directory,
479 pull_xattr_blob(pvfs, tmp_ctx, "security.XattrProbe", pvfs->base_directory,
481 talloc_free(tmp_ctx);