2 * Store Windows ACLs in data store - common functions.
3 * #included into modules/vfs_acl_xattr.c and modules/vfs_acl_tdb.c
5 * Copyright (C) Volker Lendecke, 2008
6 * Copyright (C) Jeremy Allison, 2009
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/>.
22 #include "smbd/smbd.h"
23 #include "system/filesys.h"
24 #include "../libcli/security/security.h"
25 #include "../librpc/gen_ndr/ndr_security.h"
26 #include "../lib/util/bitmap.h"
28 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
31 uint8_t hash[XATTR_SD_HASH_SIZE]);
33 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
34 vfs_handle_struct *handle,
36 const struct smb_filename *smb_fname,
39 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
43 #define HASH_SECURITY_INFO (SECINFO_OWNER | \
48 /*******************************************************************
49 Hash a security descriptor.
50 *******************************************************************/
52 static NTSTATUS hash_blob_sha256(DATA_BLOB blob,
57 memset(hash, '\0', XATTR_SD_HASH_SIZE);
59 samba_SHA256_Init(&tctx);
60 samba_SHA256_Update(&tctx, blob.data, blob.length);
61 samba_SHA256_Final(hash, &tctx);
66 /*******************************************************************
67 Hash a security descriptor.
68 *******************************************************************/
70 static NTSTATUS hash_sd_sha256(struct security_descriptor *psd,
76 memset(hash, '\0', XATTR_SD_HASH_SIZE);
77 status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
78 if (!NT_STATUS_IS_OK(status)) {
81 return hash_blob_sha256(blob, hash);
84 /*******************************************************************
85 Parse out a struct security_descriptor from a DATA_BLOB.
86 *******************************************************************/
88 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
90 struct security_descriptor **ppdesc,
91 uint16_t *p_hash_type,
93 uint8_t hash[XATTR_SD_HASH_SIZE],
94 uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
96 struct xattr_NTACL xacl;
97 enum ndr_err_code ndr_err;
99 TALLOC_CTX *frame = talloc_stackframe();
101 ndr_err = ndr_pull_struct_blob(pblob, frame, &xacl,
102 (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
104 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
105 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
106 ndr_errstr(ndr_err)));
108 return ndr_map_error2ntstatus(ndr_err);
111 *p_version = xacl.version;
113 switch (xacl.version) {
115 *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
116 xacl.info.sd->type | SEC_DESC_SELF_RELATIVE,
117 xacl.info.sd->owner_sid,
118 xacl.info.sd->group_sid,
122 /* No hash - null out. */
123 *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
124 memset(hash, '\0', XATTR_SD_HASH_SIZE);
127 *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
128 xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
129 xacl.info.sd_hs2->sd->owner_sid,
130 xacl.info.sd_hs2->sd->group_sid,
131 xacl.info.sd_hs2->sd->sacl,
132 xacl.info.sd_hs2->sd->dacl,
134 /* No hash - null out. */
135 *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
136 memset(hash, '\0', XATTR_SD_HASH_SIZE);
139 *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
140 xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
141 xacl.info.sd_hs3->sd->owner_sid,
142 xacl.info.sd_hs3->sd->group_sid,
143 xacl.info.sd_hs3->sd->sacl,
144 xacl.info.sd_hs3->sd->dacl,
146 *p_hash_type = xacl.info.sd_hs3->hash_type;
147 /* Current version 3 (if no sys acl hash available). */
148 memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
151 *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
152 xacl.info.sd_hs4->sd->type | SEC_DESC_SELF_RELATIVE,
153 xacl.info.sd_hs4->sd->owner_sid,
154 xacl.info.sd_hs4->sd->group_sid,
155 xacl.info.sd_hs4->sd->sacl,
156 xacl.info.sd_hs4->sd->dacl,
158 *p_hash_type = xacl.info.sd_hs4->hash_type;
159 /* Current version 4. */
160 memcpy(hash, xacl.info.sd_hs4->hash, XATTR_SD_HASH_SIZE);
161 memcpy(sys_acl_hash, xacl.info.sd_hs4->sys_acl_hash, XATTR_SD_HASH_SIZE);
165 return NT_STATUS_REVISION_MISMATCH;
170 return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
173 /*******************************************************************
174 Create a DATA_BLOB from a hash of the security descriptor storead at
175 the system layer and the NT ACL we wish to preserve
176 *******************************************************************/
178 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
181 uint8_t hash[XATTR_SD_HASH_SIZE])
183 struct xattr_NTACL xacl;
184 struct security_descriptor_hash_v3 sd_hs3;
185 enum ndr_err_code ndr_err;
186 TALLOC_CTX *ctx = talloc_tos();
192 xacl.info.sd_hs3 = &sd_hs3;
193 xacl.info.sd_hs3->sd = discard_const_p(struct security_descriptor, psd);
194 xacl.info.sd_hs3->hash_type = hash_type;
195 memcpy(&xacl.info.sd_hs3->hash[0], hash, XATTR_SD_HASH_SIZE);
197 ndr_err = ndr_push_struct_blob(
199 (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
201 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
202 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
203 ndr_errstr(ndr_err)));
204 return ndr_map_error2ntstatus(ndr_err);
210 /*******************************************************************
211 Create a DATA_BLOB from a hash of the security descriptors
212 (system and NT) stored at the system layer and the NT ACL we wish
214 *******************************************************************/
216 static NTSTATUS create_sys_acl_blob(const struct security_descriptor *psd,
219 uint8_t hash[XATTR_SD_HASH_SIZE],
220 const char *description,
221 uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
223 struct xattr_NTACL xacl;
224 struct security_descriptor_hash_v4 sd_hs4;
225 enum ndr_err_code ndr_err;
226 TALLOC_CTX *ctx = talloc_tos();
228 struct timeval now = timeval_current();
229 nttime_now = timeval_to_nttime(&now);
235 xacl.info.sd_hs4 = &sd_hs4;
236 xacl.info.sd_hs4->sd = discard_const_p(struct security_descriptor, psd);
237 xacl.info.sd_hs4->hash_type = hash_type;
238 memcpy(&xacl.info.sd_hs4->hash[0], hash, XATTR_SD_HASH_SIZE);
239 xacl.info.sd_hs4->description = description;
240 xacl.info.sd_hs4->time = nttime_now;
241 memcpy(&xacl.info.sd_hs4->sys_acl_hash[0], sys_acl_hash, XATTR_SD_HASH_SIZE);
243 ndr_err = ndr_push_struct_blob(
245 (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
247 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
248 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
249 ndr_errstr(ndr_err)));
250 return ndr_map_error2ntstatus(ndr_err);
256 /*******************************************************************
257 Add in 3 inheritable components for a non-inheritable directory ACL.
258 CREATOR_OWNER/CREATOR_GROUP/WORLD.
259 *******************************************************************/
261 static NTSTATUS add_directory_inheritable_components(vfs_handle_struct *handle,
263 SMB_STRUCT_STAT *psbuf,
264 struct security_descriptor *psd)
266 struct connection_struct *conn = handle->conn;
267 int num_aces = (psd->dacl ? psd->dacl->num_aces : 0);
268 struct smb_filename smb_fname;
269 enum security_ace_type acltype;
270 uint32_t access_mask;
274 struct security_ace *new_ace_list;
277 new_ace_list = talloc_zero_array(psd->dacl,
282 * make_sec_acl() at the bottom of this function
283 * dupliates new_ace_list
285 new_ace_list = talloc_zero_array(talloc_tos(),
290 if (new_ace_list == NULL) {
291 return NT_STATUS_NO_MEMORY;
294 /* Fake a quick smb_filename. */
295 ZERO_STRUCT(smb_fname);
296 smb_fname.st = *psbuf;
297 smb_fname.base_name = discard_const_p(char, name);
299 dir_mode = unix_mode(conn,
300 FILE_ATTRIBUTE_DIRECTORY, &smb_fname, NULL);
301 file_mode = unix_mode(conn,
302 FILE_ATTRIBUTE_ARCHIVE, &smb_fname, NULL);
304 mode = dir_mode | file_mode;
306 DEBUG(10, ("add_directory_inheritable_components: directory %s, "
309 (unsigned int)mode ));
312 memcpy(new_ace_list, psd->dacl->aces,
313 num_aces * sizeof(struct security_ace));
315 access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
318 init_sec_ace(&new_ace_list[num_aces],
319 &global_sid_Creator_Owner,
322 SEC_ACE_FLAG_CONTAINER_INHERIT|
323 SEC_ACE_FLAG_OBJECT_INHERIT|
324 SEC_ACE_FLAG_INHERIT_ONLY);
325 access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
326 (mode << 3) & 0700, false);
327 init_sec_ace(&new_ace_list[num_aces+1],
328 &global_sid_Creator_Group,
331 SEC_ACE_FLAG_CONTAINER_INHERIT|
332 SEC_ACE_FLAG_OBJECT_INHERIT|
333 SEC_ACE_FLAG_INHERIT_ONLY);
334 access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
335 (mode << 6) & 0700, false);
336 init_sec_ace(&new_ace_list[num_aces+2],
340 SEC_ACE_FLAG_CONTAINER_INHERIT|
341 SEC_ACE_FLAG_OBJECT_INHERIT|
342 SEC_ACE_FLAG_INHERIT_ONLY);
344 psd->dacl->aces = new_ace_list;
345 psd->dacl->num_aces += 3;
346 psd->dacl->size += new_ace_list[num_aces].size +
347 new_ace_list[num_aces+1].size +
348 new_ace_list[num_aces+2].size;
350 psd->dacl = make_sec_acl(psd,
354 if (psd->dacl == NULL) {
355 return NT_STATUS_NO_MEMORY;
361 /*******************************************************************
362 Pull a DATA_BLOB from an xattr given a pathname.
363 If the hash doesn't match, or doesn't exist - return the underlying
365 *******************************************************************/
367 static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
369 const struct smb_filename *smb_fname_in,
370 uint32_t security_info,
372 struct security_descriptor **ppdesc)
374 DATA_BLOB blob = data_blob_null;
376 uint16_t hash_type = XATTR_SD_HASH_TYPE_NONE;
377 uint16_t xattr_version = 0;
378 uint8_t hash[XATTR_SD_HASH_SIZE];
379 uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
380 uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
381 uint8_t sys_acl_hash_tmp[XATTR_SD_HASH_SIZE];
382 struct security_descriptor *psd = NULL;
383 struct security_descriptor *pdesc_next = NULL;
384 const struct smb_filename *smb_fname = NULL;
385 bool ignore_file_system_acl = lp_parm_bool(SNUM(handle->conn),
387 "ignore system acls",
389 TALLOC_CTX *frame = talloc_stackframe();
391 if (fsp && smb_fname_in == NULL) {
392 smb_fname = fsp->fsp_name;
394 smb_fname = smb_fname_in;
397 DEBUG(10, ("get_nt_acl_internal: name=%s\n", smb_fname->base_name));
399 status = get_acl_blob(frame, handle, fsp, smb_fname, &blob);
400 if (!NT_STATUS_IS_OK(status)) {
401 DEBUG(10, ("get_nt_acl_internal: get_acl_blob returned %s\n",
406 status = parse_acl_blob(&blob, mem_ctx, &psd,
407 &hash_type, &xattr_version, &hash[0], &sys_acl_hash[0]);
408 if (!NT_STATUS_IS_OK(status)) {
409 DEBUG(10, ("parse_acl_blob returned %s\n",
416 /* Ensure we don't leak psd if we don't choose it.
418 * We don't allocate it onto frame as it is preferred not to
419 * steal from a talloc pool.
421 talloc_steal(frame, psd);
423 /* determine which type of xattr we got */
424 switch (xattr_version) {
427 /* These xattr types are unilatteral, they do not
428 * require confirmation of the hash. In particular,
429 * the NTVFS file server uses version 1, but
430 * 'samba-tool ntacl' can set these as well */
434 if (ignore_file_system_acl) {
440 DEBUG(10, ("get_nt_acl_internal: ACL blob revision "
441 "mismatch (%u) for file %s\n",
442 (unsigned int)hash_type,
443 smb_fname->base_name));
449 /* determine which type of xattr we got */
450 if (hash_type != XATTR_SD_HASH_TYPE_SHA256) {
451 DEBUG(10, ("get_nt_acl_internal: ACL blob hash type "
452 "(%u) unexpected for file %s\n",
453 (unsigned int)hash_type,
454 smb_fname->base_name));
460 /* determine which type of xattr we got */
461 switch (xattr_version) {
465 char *sys_acl_blob_description;
466 DATA_BLOB sys_acl_blob;
468 /* Get the full underlying sd, then hash. */
469 ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
472 &sys_acl_blob_description,
475 /* Get the full underlying sd, then hash. */
476 ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FILE(handle,
477 smb_fname->base_name,
479 &sys_acl_blob_description,
483 /* If we fail to get the ACL blob (for some reason) then this
484 * is not fatal, we just work based on the NT ACL only */
486 status = hash_blob_sha256(sys_acl_blob, sys_acl_hash_tmp);
487 if (!NT_STATUS_IS_OK(status)) {
492 if (memcmp(&sys_acl_hash[0], &sys_acl_hash_tmp[0],
493 XATTR_SD_HASH_SIZE) == 0) {
494 /* Hash matches, return blob sd. */
495 DEBUG(10, ("get_nt_acl_internal: blob hash "
496 "matches for file %s\n",
497 smb_fname->base_name ));
502 /* Otherwise, fall though and see if the NT ACL hash matches */
505 /* Get the full underlying sd for the hash
506 or to return as backup. */
508 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
514 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
521 if (!NT_STATUS_IS_OK(status)) {
522 DEBUG(10, ("get_nt_acl_internal: get_next_acl for file %s "
524 smb_fname->base_name,
530 /* Ensure we don't leak psd_next if we don't choose it.
532 * We don't allocate it onto frame as it is preferred not to
533 * steal from a talloc pool.
535 talloc_steal(frame, pdesc_next);
537 status = hash_sd_sha256(pdesc_next, hash_tmp);
538 if (!NT_STATUS_IS_OK(status)) {
544 if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
545 /* Hash matches, return blob sd. */
546 DEBUG(10, ("get_nt_acl_internal: blob hash "
547 "matches for file %s\n",
548 smb_fname->base_name ));
552 /* Hash doesn't match, return underlying sd. */
553 DEBUG(10, ("get_nt_acl_internal: blob hash "
554 "does not match for file %s - returning "
555 "file system SD mapping.\n",
556 smb_fname->base_name ));
558 if (DEBUGLEVEL >= 10) {
559 DEBUG(10,("get_nt_acl_internal: acl for blob hash for %s is:\n",
560 smb_fname->base_name ));
561 NDR_PRINT_DEBUG(security_descriptor, pdesc_next);
570 /* Get the full underlying sd, as we failed to get the
571 * blob for the hash, or the revision/hash type wasn't
574 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
580 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
587 if (!NT_STATUS_IS_OK(status)) {
588 DEBUG(10, ("get_nt_acl_internal: get_next_acl for file %s "
590 smb_fname->base_name,
596 /* Ensure we don't leak psd_next if we don't choose it.
598 * We don't allocate it onto frame as it is preferred not to
599 * steal from a talloc pool.
601 talloc_steal(frame, pdesc_next);
605 if (psd != pdesc_next) {
606 /* We're returning the blob, throw
607 * away the filesystem SD. */
608 TALLOC_FREE(pdesc_next);
610 SMB_STRUCT_STAT sbuf;
611 SMB_STRUCT_STAT *psbuf = &sbuf;
612 bool is_directory = false;
614 * We're returning the underlying ACL from the
615 * filesystem. If it's a directory, and has no
616 * inheritable ACE entries we have to fake them.
619 status = vfs_stat_fsp(fsp);
620 if (!NT_STATUS_IS_OK(status)) {
624 psbuf = &fsp->fsp_name->st;
627 * https://bugzilla.samba.org/show_bug.cgi?id=11249
629 * We are currently guaranteed that 'name' here is
630 * a smb_fname->base_name, which *cannot* contain
631 * a stream name (':'). vfs_stat_smb_fname() splits
632 * a name into a base name + stream name, which
633 * when we get here we know we've already done.
634 * So we have to call the stat or lstat VFS
635 * calls directly here. Else, a base_name that
636 * contains a ':' (from a demangled name) will
640 * This uglyness will go away once smb_fname
641 * is fully plumbed through the VFS.
643 int ret = vfs_stat_smb_basename(handle->conn,
648 return map_nt_error_from_unix(errno);
651 is_directory = S_ISDIR(psbuf->st_ex_mode);
653 if (ignore_file_system_acl) {
654 TALLOC_FREE(pdesc_next);
655 status = make_default_filesystem_acl(mem_ctx,
656 smb_fname->base_name,
659 if (!NT_STATUS_IS_OK(status)) {
665 !sd_has_inheritable_components(psd,
667 status = add_directory_inheritable_components(
669 smb_fname->base_name,
672 if (!NT_STATUS_IS_OK(status)) {
677 /* The underlying POSIX module always sets
678 the ~SEC_DESC_DACL_PROTECTED bit, as ACLs
679 can't be inherited in this way under POSIX.
680 Remove it for Windows-style ACLs. */
681 psd->type &= ~SEC_DESC_DACL_PROTECTED;
685 if (!(security_info & SECINFO_OWNER)) {
686 psd->owner_sid = NULL;
688 if (!(security_info & SECINFO_GROUP)) {
689 psd->group_sid = NULL;
691 if (!(security_info & SECINFO_DACL)) {
692 psd->type &= ~SEC_DESC_DACL_PRESENT;
695 if (!(security_info & SECINFO_SACL)) {
696 psd->type &= ~SEC_DESC_SACL_PRESENT;
700 TALLOC_FREE(blob.data);
702 if (DEBUGLEVEL >= 10) {
703 DEBUG(10,("get_nt_acl_internal: returning acl for %s is:\n",
704 smb_fname->base_name ));
705 NDR_PRINT_DEBUG(security_descriptor, psd);
708 /* The VFS API is that the ACL is expected to be on mem_ctx */
709 *ppdesc = talloc_move(mem_ctx, &psd);
715 /*********************************************************************
716 Fetch a security descriptor given an fsp.
717 *********************************************************************/
719 static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle,
721 uint32_t security_info,
723 struct security_descriptor **ppdesc)
725 return get_nt_acl_internal(handle, fsp,
726 NULL, security_info, mem_ctx, ppdesc);
729 /*********************************************************************
730 Fetch a security descriptor given a pathname.
731 *********************************************************************/
733 static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
734 const struct smb_filename *smb_fname,
735 uint32_t security_info,
737 struct security_descriptor **ppdesc)
739 return get_nt_acl_internal(handle,
747 /*********************************************************************
748 Set the underlying ACL (e.g. POSIX ACLS, POSIX owner, etc)
749 *********************************************************************/
750 static NTSTATUS set_underlying_acl(vfs_handle_struct *handle, files_struct *fsp,
751 struct security_descriptor *psd,
752 uint32_t security_info_sent,
756 SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
757 if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
761 /* We got access denied here. If we're already root,
762 or we didn't need to do a chown, or the fsp isn't
763 open with WRITE_OWNER access, just return. */
764 if (get_current_uid(handle->conn) == 0 || chown_needed == false ||
765 !(fsp->access_mask & SEC_STD_WRITE_OWNER)) {
766 return NT_STATUS_ACCESS_DENIED;
769 DEBUG(10, ("fset_nt_acl_common: overriding chown on file %s "
771 fsp_str_dbg(fsp), sid_string_tos(psd->owner_sid)));
773 /* Ok, we failed to chown and we have
774 SEC_STD_WRITE_OWNER access - override. */
776 status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
782 /*********************************************************************
783 Store a v3 security descriptor
784 *********************************************************************/
785 static NTSTATUS store_v3_blob(vfs_handle_struct *handle, files_struct *fsp,
786 struct security_descriptor *psd,
787 struct security_descriptor *pdesc_next,
788 uint8_t hash[XATTR_SD_HASH_SIZE])
793 if (DEBUGLEVEL >= 10) {
794 DEBUG(10, ("fset_nt_acl_xattr: storing xattr sd for file %s\n",
798 discard_const_p(struct security_descriptor, psd));
800 if (pdesc_next != NULL) {
801 DEBUG(10, ("fset_nt_acl_xattr: storing has in xattr sd "
805 discard_const_p(struct security_descriptor,
809 ("fset_nt_acl_xattr: ignoring underlying sd\n"));
812 status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
813 if (!NT_STATUS_IS_OK(status)) {
814 DEBUG(10, ("fset_nt_acl_xattr: create_acl_blob failed\n"));
818 status = store_acl_blob_fsp(handle, fsp, &blob);
822 /*********************************************************************
823 Store a security descriptor given an fsp.
824 *********************************************************************/
826 static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
827 uint32_t security_info_sent, const struct security_descriptor *orig_psd)
831 DATA_BLOB blob, sys_acl_blob;
832 struct security_descriptor *pdesc_next = NULL;
833 struct security_descriptor *psd = NULL;
834 uint8_t hash[XATTR_SD_HASH_SIZE];
835 uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
836 bool chown_needed = false;
837 char *sys_acl_description;
838 TALLOC_CTX *frame = talloc_stackframe();
839 bool ignore_file_system_acl = lp_parm_bool(
840 SNUM(handle->conn), ACL_MODULE_NAME, "ignore system acls", false);
842 if (DEBUGLEVEL >= 10) {
843 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
845 NDR_PRINT_DEBUG(security_descriptor,
846 discard_const_p(struct security_descriptor, orig_psd));
849 status = get_nt_acl_internal(handle, fsp,
851 SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
855 if (!NT_STATUS_IS_OK(status)) {
860 psd->revision = orig_psd->revision;
861 /* All our SD's are self relative. */
862 psd->type = orig_psd->type | SEC_DESC_SELF_RELATIVE;
864 if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
865 if (!dom_sid_equal(orig_psd->owner_sid, psd->owner_sid)) {
866 /* We're changing the owner. */
869 psd->owner_sid = orig_psd->owner_sid;
871 if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
872 if (!dom_sid_equal(orig_psd->group_sid, psd->group_sid)) {
873 /* We're changing the group. */
876 psd->group_sid = orig_psd->group_sid;
878 if (security_info_sent & SECINFO_DACL) {
879 if (security_descriptor_with_ms_nfs(orig_psd)) {
881 * If the sd contains a MS NFS SID, do
882 * nothing, it's a chmod() request from OS X
888 psd->dacl = orig_psd->dacl;
889 psd->type |= SEC_DESC_DACL_PRESENT;
891 if (security_info_sent & SECINFO_SACL) {
892 psd->sacl = orig_psd->sacl;
893 psd->type |= SEC_DESC_SACL_PRESENT;
896 if (ignore_file_system_acl) {
898 /* send only ownership stuff to lower layer */
899 security_info_sent &= (SECINFO_OWNER | SECINFO_GROUP);
900 status = set_underlying_acl(handle, fsp, psd,
901 security_info_sent, true);
902 if (!NT_STATUS_IS_OK(status)) {
908 status = store_v3_blob(handle, fsp, psd, NULL, hash);
914 status = set_underlying_acl(handle, fsp, psd, security_info_sent,
916 if (!NT_STATUS_IS_OK(status)) {
921 /* Get the full underlying sd, then hash. */
922 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
928 if (!NT_STATUS_IS_OK(status)) {
933 status = hash_sd_sha256(pdesc_next, hash);
934 if (!NT_STATUS_IS_OK(status)) {
939 /* Get the full underlying sd, then hash. */
940 ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
943 &sys_acl_description,
946 /* If we fail to get the ACL blob (for some reason) then this
947 * is not fatal, we just work based on the NT ACL only */
949 status = store_v3_blob(handle, fsp, psd, pdesc_next, hash);
955 status = hash_blob_sha256(sys_acl_blob, sys_acl_hash);
956 if (!NT_STATUS_IS_OK(status)) {
961 if (DEBUGLEVEL >= 10) {
962 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s based on system ACL\n",
964 NDR_PRINT_DEBUG(security_descriptor,
965 discard_const_p(struct security_descriptor, psd));
967 DEBUG(10,("fset_nt_acl_xattr: storing hash in xattr sd based on system ACL and:\n"));
968 NDR_PRINT_DEBUG(security_descriptor,
969 discard_const_p(struct security_descriptor, pdesc_next));
972 /* We store hashes of both the sys ACL blob and the NT
973 * security desciptor mapped from that ACL so as to improve
974 * our chances against some inadvertant change breaking the
976 status = create_sys_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash,
977 sys_acl_description, sys_acl_hash);
978 if (!NT_STATUS_IS_OK(status)) {
979 DEBUG(10, ("fset_nt_acl_xattr: create_sys_acl_blob failed\n"));
984 status = store_acl_blob_fsp(handle, fsp, &blob);
990 static int acl_common_remove_object(vfs_handle_struct *handle,
994 connection_struct *conn = handle->conn;
996 files_struct *fsp = NULL;
998 char *parent_dir = NULL;
999 const char *final_component = NULL;
1000 struct smb_filename local_fname;
1001 int saved_errno = 0;
1002 char *saved_dir = NULL;
1004 saved_dir = vfs_GetWd(talloc_tos(),conn);
1006 saved_errno = errno;
1010 if (!parent_dirname(talloc_tos(), path,
1011 &parent_dir, &final_component)) {
1012 saved_errno = ENOMEM;
1016 DEBUG(10,("acl_common_remove_object: removing %s %s/%s\n",
1017 is_directory ? "directory" : "file",
1018 parent_dir, final_component ));
1020 /* cd into the parent dir to pin it. */
1021 ret = vfs_ChDir(conn, parent_dir);
1023 saved_errno = errno;
1027 ZERO_STRUCT(local_fname);
1028 local_fname.base_name = discard_const_p(char, final_component);
1030 /* Must use lstat here. */
1031 ret = SMB_VFS_LSTAT(conn, &local_fname);
1033 saved_errno = errno;
1037 /* Ensure we have this file open with DELETE access. */
1038 id = vfs_file_id_from_sbuf(conn, &local_fname.st);
1039 for (fsp = file_find_di_first(conn->sconn, id); fsp;
1040 fsp = file_find_di_next(fsp)) {
1041 if (fsp->access_mask & DELETE_ACCESS &&
1042 fsp->delete_on_close) {
1043 /* We did open this for delete,
1044 * allow the delete as root.
1051 DEBUG(10,("acl_common_remove_object: %s %s/%s "
1052 "not an open file\n",
1053 is_directory ? "directory" : "file",
1054 parent_dir, final_component ));
1055 saved_errno = EACCES;
1061 ret = SMB_VFS_NEXT_RMDIR(handle, &local_fname);
1063 ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
1068 saved_errno = errno;
1073 TALLOC_FREE(parent_dir);
1076 vfs_ChDir(conn, saved_dir);
1079 errno = saved_errno;
1084 static int rmdir_acl_common(struct vfs_handle_struct *handle,
1085 const struct smb_filename *smb_fname)
1089 /* Try the normal rmdir first. */
1090 ret = SMB_VFS_NEXT_RMDIR(handle, smb_fname);
1094 if (errno == EACCES || errno == EPERM) {
1095 /* Failed due to access denied,
1096 see if we need to root override. */
1097 return acl_common_remove_object(handle,
1098 smb_fname->base_name,
1102 DEBUG(10,("rmdir_acl_common: unlink of %s failed %s\n",
1103 smb_fname->base_name,
1108 static int unlink_acl_common(struct vfs_handle_struct *handle,
1109 const struct smb_filename *smb_fname)
1113 /* Try the normal unlink first. */
1114 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
1118 if (errno == EACCES || errno == EPERM) {
1119 /* Failed due to access denied,
1120 see if we need to root override. */
1122 /* Don't do anything fancy for streams. */
1123 if (smb_fname->stream_name) {
1126 return acl_common_remove_object(handle,
1127 smb_fname->base_name,
1131 DEBUG(10,("unlink_acl_common: unlink of %s failed %s\n",
1132 smb_fname->base_name,
1137 static int chmod_acl_module_common(struct vfs_handle_struct *handle,
1138 const struct smb_filename *smb_fname,
1141 if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
1142 /* Only allow this on POSIX pathnames. */
1143 return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
1148 static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
1149 struct files_struct *fsp, mode_t mode)
1151 if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1152 /* Only allow this on POSIX opens. */
1153 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1158 static int chmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1159 const struct smb_filename *smb_fname,
1162 if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
1163 /* Only allow this on POSIX pathnames. */
1164 return SMB_VFS_NEXT_CHMOD_ACL(handle, smb_fname, mode);
1169 static int fchmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1170 struct files_struct *fsp, mode_t mode)
1172 if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1173 /* Only allow this on POSIX opens. */
1174 return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);