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"
27 #include "passdb/lookup_sid.h"
29 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
32 uint8_t hash[XATTR_SD_HASH_SIZE]);
34 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
35 vfs_handle_struct *handle,
37 const struct smb_filename *smb_fname,
40 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
44 #define HASH_SECURITY_INFO (SECINFO_OWNER | \
49 enum default_acl_style {DEFAULT_ACL_POSIX, DEFAULT_ACL_WINDOWS};
51 static const struct enum_list default_acl_style[] = {
52 {DEFAULT_ACL_POSIX, "posix"},
53 {DEFAULT_ACL_WINDOWS, "windows"}
56 struct acl_common_config {
57 bool ignore_system_acls;
58 enum default_acl_style default_acl_style;
61 static bool init_acl_common_config(vfs_handle_struct *handle)
63 struct acl_common_config *config = NULL;
65 config = talloc_zero(handle->conn, struct acl_common_config);
67 DBG_ERR("talloc_zero() failed\n");
72 config->ignore_system_acls = lp_parm_bool(SNUM(handle->conn),
76 config->default_acl_style = lp_parm_enum(SNUM(handle->conn),
82 SMB_VFS_HANDLE_SET_DATA(handle, config, NULL,
83 struct acl_common_config,
90 /*******************************************************************
91 Hash a security descriptor.
92 *******************************************************************/
94 static NTSTATUS hash_blob_sha256(DATA_BLOB blob,
99 memset(hash, '\0', XATTR_SD_HASH_SIZE);
101 samba_SHA256_Init(&tctx);
102 samba_SHA256_Update(&tctx, blob.data, blob.length);
103 samba_SHA256_Final(hash, &tctx);
108 /*******************************************************************
109 Hash a security descriptor.
110 *******************************************************************/
112 static NTSTATUS hash_sd_sha256(struct security_descriptor *psd,
118 memset(hash, '\0', XATTR_SD_HASH_SIZE);
119 status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
120 if (!NT_STATUS_IS_OK(status)) {
123 return hash_blob_sha256(blob, hash);
126 /*******************************************************************
127 Parse out a struct security_descriptor from a DATA_BLOB.
128 *******************************************************************/
130 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
132 struct security_descriptor **ppdesc,
133 uint16_t *p_hash_type,
135 uint8_t hash[XATTR_SD_HASH_SIZE],
136 uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
138 struct xattr_NTACL xacl;
139 enum ndr_err_code ndr_err;
141 TALLOC_CTX *frame = talloc_stackframe();
143 ndr_err = ndr_pull_struct_blob(pblob, frame, &xacl,
144 (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
146 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
147 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
148 ndr_errstr(ndr_err)));
150 return ndr_map_error2ntstatus(ndr_err);
153 *p_version = xacl.version;
155 switch (xacl.version) {
157 *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
158 xacl.info.sd->type | SEC_DESC_SELF_RELATIVE,
159 xacl.info.sd->owner_sid,
160 xacl.info.sd->group_sid,
164 /* No hash - null out. */
165 *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
166 memset(hash, '\0', XATTR_SD_HASH_SIZE);
169 *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
170 xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
171 xacl.info.sd_hs2->sd->owner_sid,
172 xacl.info.sd_hs2->sd->group_sid,
173 xacl.info.sd_hs2->sd->sacl,
174 xacl.info.sd_hs2->sd->dacl,
176 /* No hash - null out. */
177 *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
178 memset(hash, '\0', XATTR_SD_HASH_SIZE);
181 *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
182 xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
183 xacl.info.sd_hs3->sd->owner_sid,
184 xacl.info.sd_hs3->sd->group_sid,
185 xacl.info.sd_hs3->sd->sacl,
186 xacl.info.sd_hs3->sd->dacl,
188 *p_hash_type = xacl.info.sd_hs3->hash_type;
189 /* Current version 3 (if no sys acl hash available). */
190 memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
193 *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
194 xacl.info.sd_hs4->sd->type | SEC_DESC_SELF_RELATIVE,
195 xacl.info.sd_hs4->sd->owner_sid,
196 xacl.info.sd_hs4->sd->group_sid,
197 xacl.info.sd_hs4->sd->sacl,
198 xacl.info.sd_hs4->sd->dacl,
200 *p_hash_type = xacl.info.sd_hs4->hash_type;
201 /* Current version 4. */
202 memcpy(hash, xacl.info.sd_hs4->hash, XATTR_SD_HASH_SIZE);
203 memcpy(sys_acl_hash, xacl.info.sd_hs4->sys_acl_hash, XATTR_SD_HASH_SIZE);
207 return NT_STATUS_REVISION_MISMATCH;
212 return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
215 /*******************************************************************
216 Create a DATA_BLOB from a hash of the security descriptor storead at
217 the system layer and the NT ACL we wish to preserve
218 *******************************************************************/
220 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
223 uint8_t hash[XATTR_SD_HASH_SIZE])
225 struct xattr_NTACL xacl;
226 struct security_descriptor_hash_v3 sd_hs3;
227 enum ndr_err_code ndr_err;
228 TALLOC_CTX *ctx = talloc_tos();
234 xacl.info.sd_hs3 = &sd_hs3;
235 xacl.info.sd_hs3->sd = discard_const_p(struct security_descriptor, psd);
236 xacl.info.sd_hs3->hash_type = hash_type;
237 memcpy(&xacl.info.sd_hs3->hash[0], hash, XATTR_SD_HASH_SIZE);
239 ndr_err = ndr_push_struct_blob(
241 (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
243 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
244 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
245 ndr_errstr(ndr_err)));
246 return ndr_map_error2ntstatus(ndr_err);
252 /*******************************************************************
253 Create a DATA_BLOB from a hash of the security descriptors
254 (system and NT) stored at the system layer and the NT ACL we wish
256 *******************************************************************/
258 static NTSTATUS create_sys_acl_blob(const struct security_descriptor *psd,
261 uint8_t hash[XATTR_SD_HASH_SIZE],
262 const char *description,
263 uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
265 struct xattr_NTACL xacl;
266 struct security_descriptor_hash_v4 sd_hs4;
267 enum ndr_err_code ndr_err;
268 TALLOC_CTX *ctx = talloc_tos();
270 struct timeval now = timeval_current();
271 nttime_now = timeval_to_nttime(&now);
277 xacl.info.sd_hs4 = &sd_hs4;
278 xacl.info.sd_hs4->sd = discard_const_p(struct security_descriptor, psd);
279 xacl.info.sd_hs4->hash_type = hash_type;
280 memcpy(&xacl.info.sd_hs4->hash[0], hash, XATTR_SD_HASH_SIZE);
281 xacl.info.sd_hs4->description = description;
282 xacl.info.sd_hs4->time = nttime_now;
283 memcpy(&xacl.info.sd_hs4->sys_acl_hash[0], sys_acl_hash, XATTR_SD_HASH_SIZE);
285 ndr_err = ndr_push_struct_blob(
287 (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
289 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
290 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
291 ndr_errstr(ndr_err)));
292 return ndr_map_error2ntstatus(ndr_err);
298 /*******************************************************************
299 Add in 3 inheritable components for a non-inheritable directory ACL.
300 CREATOR_OWNER/CREATOR_GROUP/WORLD.
301 *******************************************************************/
303 static NTSTATUS add_directory_inheritable_components(vfs_handle_struct *handle,
305 SMB_STRUCT_STAT *psbuf,
306 struct security_descriptor *psd)
308 struct connection_struct *conn = handle->conn;
309 int num_aces = (psd->dacl ? psd->dacl->num_aces : 0);
310 struct smb_filename smb_fname;
311 enum security_ace_type acltype;
312 uint32_t access_mask;
316 struct security_ace *new_ace_list;
319 new_ace_list = talloc_zero_array(psd->dacl,
324 * make_sec_acl() at the bottom of this function
325 * dupliates new_ace_list
327 new_ace_list = talloc_zero_array(talloc_tos(),
332 if (new_ace_list == NULL) {
333 return NT_STATUS_NO_MEMORY;
336 /* Fake a quick smb_filename. */
337 ZERO_STRUCT(smb_fname);
338 smb_fname.st = *psbuf;
339 smb_fname.base_name = discard_const_p(char, name);
341 dir_mode = unix_mode(conn,
342 FILE_ATTRIBUTE_DIRECTORY, &smb_fname, NULL);
343 file_mode = unix_mode(conn,
344 FILE_ATTRIBUTE_ARCHIVE, &smb_fname, NULL);
346 mode = dir_mode | file_mode;
348 DEBUG(10, ("add_directory_inheritable_components: directory %s, "
351 (unsigned int)mode ));
354 memcpy(new_ace_list, psd->dacl->aces,
355 num_aces * sizeof(struct security_ace));
357 access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
360 init_sec_ace(&new_ace_list[num_aces],
361 &global_sid_Creator_Owner,
364 SEC_ACE_FLAG_CONTAINER_INHERIT|
365 SEC_ACE_FLAG_OBJECT_INHERIT|
366 SEC_ACE_FLAG_INHERIT_ONLY);
367 access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
368 (mode << 3) & 0700, false);
369 init_sec_ace(&new_ace_list[num_aces+1],
370 &global_sid_Creator_Group,
373 SEC_ACE_FLAG_CONTAINER_INHERIT|
374 SEC_ACE_FLAG_OBJECT_INHERIT|
375 SEC_ACE_FLAG_INHERIT_ONLY);
376 access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
377 (mode << 6) & 0700, false);
378 init_sec_ace(&new_ace_list[num_aces+2],
382 SEC_ACE_FLAG_CONTAINER_INHERIT|
383 SEC_ACE_FLAG_OBJECT_INHERIT|
384 SEC_ACE_FLAG_INHERIT_ONLY);
386 psd->dacl->aces = new_ace_list;
387 psd->dacl->num_aces += 3;
388 psd->dacl->size += new_ace_list[num_aces].size +
389 new_ace_list[num_aces+1].size +
390 new_ace_list[num_aces+2].size;
392 psd->dacl = make_sec_acl(psd,
396 if (psd->dacl == NULL) {
397 return NT_STATUS_NO_MEMORY;
403 static NTSTATUS make_default_acl_posix(TALLOC_CTX *ctx,
405 SMB_STRUCT_STAT *psbuf,
406 struct security_descriptor **ppdesc)
408 struct dom_sid owner_sid, group_sid;
410 struct security_ace aces[4];
411 uint32_t access_mask = 0;
412 mode_t mode = psbuf->st_ex_mode;
413 struct security_acl *new_dacl = NULL;
416 DBG_DEBUG("file %s mode = 0%o\n",name, (int)mode);
418 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
419 gid_to_sid(&group_sid, psbuf->st_ex_gid);
422 We provide up to 4 ACEs
429 if (mode & S_IRUSR) {
430 if (mode & S_IWUSR) {
431 access_mask |= SEC_RIGHTS_FILE_ALL;
433 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
436 if (mode & S_IWUSR) {
437 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
440 init_sec_ace(&aces[idx],
442 SEC_ACE_TYPE_ACCESS_ALLOWED,
448 if (mode & S_IRGRP) {
449 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
451 if (mode & S_IWGRP) {
452 /* note that delete is not granted - this matches posix behaviour */
453 access_mask |= SEC_RIGHTS_FILE_WRITE;
456 init_sec_ace(&aces[idx],
458 SEC_ACE_TYPE_ACCESS_ALLOWED,
465 if (mode & S_IROTH) {
466 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
468 if (mode & S_IWOTH) {
469 access_mask |= SEC_RIGHTS_FILE_WRITE;
472 init_sec_ace(&aces[idx],
474 SEC_ACE_TYPE_ACCESS_ALLOWED,
480 init_sec_ace(&aces[idx],
482 SEC_ACE_TYPE_ACCESS_ALLOWED,
487 new_dacl = make_sec_acl(ctx,
493 return NT_STATUS_NO_MEMORY;
496 *ppdesc = make_sec_desc(ctx,
497 SECURITY_DESCRIPTOR_REVISION_1,
498 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
505 return NT_STATUS_NO_MEMORY;
510 static NTSTATUS make_default_acl_windows(TALLOC_CTX *ctx,
512 SMB_STRUCT_STAT *psbuf,
513 struct security_descriptor **ppdesc)
515 struct dom_sid owner_sid, group_sid;
517 struct security_ace aces[4];
518 uint32_t access_mask = 0;
519 mode_t mode = psbuf->st_ex_mode;
520 struct security_acl *new_dacl = NULL;
523 DBG_DEBUG("file [%s] mode [0%o]\n", name, (int)mode);
525 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
526 gid_to_sid(&group_sid, psbuf->st_ex_gid);
534 if (mode & S_IRUSR) {
535 if (mode & S_IWUSR) {
536 access_mask |= SEC_RIGHTS_FILE_ALL;
538 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
541 if (mode & S_IWUSR) {
542 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
545 init_sec_ace(&aces[idx],
547 SEC_ACE_TYPE_ACCESS_ALLOWED,
552 init_sec_ace(&aces[idx],
554 SEC_ACE_TYPE_ACCESS_ALLOWED,
559 new_dacl = make_sec_acl(ctx,
565 return NT_STATUS_NO_MEMORY;
568 *ppdesc = make_sec_desc(ctx,
569 SECURITY_DESCRIPTOR_REVISION_1,
570 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
577 return NT_STATUS_NO_MEMORY;
582 static NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
583 struct acl_common_config *config,
585 SMB_STRUCT_STAT *psbuf,
586 struct security_descriptor **ppdesc)
590 switch (config->default_acl_style) {
592 case DEFAULT_ACL_POSIX:
593 status = make_default_acl_posix(ctx, name, psbuf, ppdesc);
596 case DEFAULT_ACL_WINDOWS:
597 status = make_default_acl_windows(ctx, name, psbuf, ppdesc);
601 DBG_ERR("unknown acl style %d", config->default_acl_style);
602 status = NT_STATUS_INTERNAL_ERROR;
610 * Validate an ACL blob
612 * This validates an ACL blob against the underlying filesystem ACL. If this
613 * function returns NT_STATUS_OK ppsd can be
615 * 1. the ACL from the blob (psd_from_fs=false), or
616 * 2. the ACL from the fs (psd_from_fs=true), or
619 * If the return value is anything else then NT_STATUS_OK, ppsd is set to NULL
620 * and psd_from_fs set to false.
622 * Returning the underlying filesystem ACL in case no. 2 is really just an
623 * optimisation, because some validations have to fetch the filesytem ACL as
624 * part of the validation, so we already have it available and callers might
627 static NTSTATUS validate_nt_acl_blob(TALLOC_CTX *mem_ctx,
628 vfs_handle_struct *handle,
630 const struct smb_filename *smb_fname,
631 const DATA_BLOB *blob,
632 struct security_descriptor **ppsd,
633 bool *psd_is_from_fs)
636 uint16_t hash_type = XATTR_SD_HASH_TYPE_NONE;
637 uint16_t xattr_version = 0;
638 uint8_t hash[XATTR_SD_HASH_SIZE];
639 uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
640 uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
641 uint8_t sys_acl_hash_tmp[XATTR_SD_HASH_SIZE];
642 struct security_descriptor *psd = NULL;
643 struct security_descriptor *psd_blob = NULL;
644 struct security_descriptor *psd_fs = NULL;
645 char *sys_acl_blob_description = NULL;
646 DATA_BLOB sys_acl_blob = { 0 };
647 struct acl_common_config *config = NULL;
650 *psd_is_from_fs = false;
652 SMB_VFS_HANDLE_GET_DATA(handle, config,
653 struct acl_common_config,
654 return NT_STATUS_UNSUCCESSFUL);
656 status = parse_acl_blob(blob,
663 if (!NT_STATUS_IS_OK(status)) {
664 DBG_DEBUG("parse_acl_blob returned %s\n", nt_errstr(status));
668 /* determine which type of xattr we got */
669 switch (xattr_version) {
672 /* These xattr types are unilatteral, they do not
673 * require confirmation of the hash. In particular,
674 * the NTVFS file server uses version 1, but
675 * 'samba-tool ntacl' can set these as well */
680 if (config->ignore_system_acls) {
687 DBG_DEBUG("ACL blob revision mismatch (%u) for file %s\n",
688 (unsigned int)hash_type, smb_fname->base_name);
689 TALLOC_FREE(psd_blob);
693 /* determine which type of xattr we got */
694 if (hash_type != XATTR_SD_HASH_TYPE_SHA256) {
695 DBG_DEBUG("ACL blob hash type (%u) unexpected for file %s\n",
696 (unsigned int)hash_type, smb_fname->base_name);
697 TALLOC_FREE(psd_blob);
701 /* determine which type of xattr we got */
702 switch (xattr_version) {
707 /* Get the full underlying sd, then hash. */
708 ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
711 &sys_acl_blob_description,
714 /* Get the full underlying sd, then hash. */
715 ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FILE(handle,
716 smb_fname->base_name,
718 &sys_acl_blob_description,
722 /* If we fail to get the ACL blob (for some reason) then this
723 * is not fatal, we just work based on the NT ACL only */
725 status = hash_blob_sha256(sys_acl_blob, sys_acl_hash_tmp);
726 if (!NT_STATUS_IS_OK(status)) {
730 TALLOC_FREE(sys_acl_blob_description);
731 TALLOC_FREE(sys_acl_blob.data);
733 if (memcmp(&sys_acl_hash[0], &sys_acl_hash_tmp[0],
734 XATTR_SD_HASH_SIZE) == 0) {
735 /* Hash matches, return blob sd. */
736 DBG_DEBUG("blob hash matches for file %s\n",
737 smb_fname->base_name);
743 /* Otherwise, fall though and see if the NT ACL hash matches */
746 /* Get the full underlying sd for the hash
747 or to return as backup. */
749 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
755 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
762 if (!NT_STATUS_IS_OK(status)) {
763 DBG_DEBUG("get_next_acl for file %s returned %s\n",
764 smb_fname->base_name, nt_errstr(status));
768 status = hash_sd_sha256(psd_fs, hash_tmp);
769 if (!NT_STATUS_IS_OK(status)) {
770 TALLOC_FREE(psd_blob);
772 *psd_is_from_fs = true;
776 if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
777 /* Hash matches, return blob sd. */
778 DBG_DEBUG("blob hash matches for file %s\n",
779 smb_fname->base_name);
784 /* Hash doesn't match, return underlying sd. */
785 DBG_DEBUG("blob hash does not match for file %s - returning "
786 "file system SD mapping.\n",
787 smb_fname->base_name);
789 if (DEBUGLEVEL >= 10) {
790 DBG_DEBUG("acl for blob hash for %s is:\n",
791 smb_fname->base_name);
792 NDR_PRINT_DEBUG(security_descriptor, psd_fs);
795 TALLOC_FREE(psd_blob);
797 *psd_is_from_fs = true;
804 TALLOC_FREE(psd_blob);
806 TALLOC_FREE(sys_acl_blob_description);
807 TALLOC_FREE(sys_acl_blob.data);
811 static NTSTATUS stat_fsp_or_smb_fname(vfs_handle_struct *handle,
813 const struct smb_filename *smb_fname,
814 SMB_STRUCT_STAT *sbuf,
815 SMB_STRUCT_STAT **psbuf)
821 status = vfs_stat_fsp(fsp);
822 if (!NT_STATUS_IS_OK(status)) {
825 *psbuf = &fsp->fsp_name->st;
828 * https://bugzilla.samba.org/show_bug.cgi?id=11249
830 * We are currently guaranteed that 'name' here is a
831 * smb_fname->base_name, which *cannot* contain a stream name
832 * (':'). vfs_stat_smb_fname() splits a name into a base name +
833 * stream name, which when we get here we know we've already
834 * done. So we have to call the stat or lstat VFS calls
835 * directly here. Else, a base_name that contains a ':' (from a
836 * demangled name) will get split again.
839 * This uglyness will go away once smb_fname is fully plumbed
842 ret = vfs_stat_smb_basename(handle->conn,
846 return map_nt_error_from_unix(errno);
853 /*******************************************************************
854 Pull a DATA_BLOB from an xattr given a pathname.
855 If the hash doesn't match, or doesn't exist - return the underlying
857 *******************************************************************/
859 static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
861 const struct smb_filename *smb_fname_in,
862 uint32_t security_info,
864 struct security_descriptor **ppdesc)
866 DATA_BLOB blob = data_blob_null;
868 struct security_descriptor *psd = NULL;
869 const struct smb_filename *smb_fname = NULL;
870 bool psd_is_from_fs = false;
871 struct acl_common_config *config = NULL;
873 SMB_VFS_HANDLE_GET_DATA(handle, config,
874 struct acl_common_config,
875 return NT_STATUS_UNSUCCESSFUL);
877 if (fsp && smb_fname_in == NULL) {
878 smb_fname = fsp->fsp_name;
880 smb_fname = smb_fname_in;
883 DEBUG(10, ("get_nt_acl_internal: name=%s\n", smb_fname->base_name));
885 status = get_acl_blob(mem_ctx, handle, fsp, smb_fname, &blob);
886 if (NT_STATUS_IS_OK(status)) {
887 status = validate_nt_acl_blob(mem_ctx,
894 TALLOC_FREE(blob.data);
895 if (!NT_STATUS_IS_OK(status)) {
896 DBG_DEBUG("ACL validation for [%s] failed\n",
897 smb_fname->base_name);
903 /* Get the full underlying sd, as we failed to get the
904 * blob for the hash, or the revision/hash type wasn't
907 if (config->ignore_system_acls) {
908 SMB_STRUCT_STAT sbuf;
909 SMB_STRUCT_STAT *psbuf = &sbuf;
911 status = stat_fsp_or_smb_fname(handle, fsp, smb_fname,
913 if (!NT_STATUS_IS_OK(status)) {
917 status = make_default_filesystem_acl(
920 smb_fname->base_name,
923 if (!NT_STATUS_IS_OK(status)) {
928 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
934 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
941 if (!NT_STATUS_IS_OK(status)) {
942 DBG_DEBUG("get_next_acl for file %s "
944 smb_fname->base_name,
949 psd_is_from_fs = true;
953 if (psd_is_from_fs) {
954 SMB_STRUCT_STAT sbuf;
955 SMB_STRUCT_STAT *psbuf = &sbuf;
956 bool is_directory = false;
959 * We're returning the underlying ACL from the
960 * filesystem. If it's a directory, and has no
961 * inheritable ACE entries we have to fake them.
964 status = stat_fsp_or_smb_fname(handle, fsp, smb_fname,
966 if (!NT_STATUS_IS_OK(status)) {
970 is_directory = S_ISDIR(psbuf->st_ex_mode);
972 if (is_directory && !sd_has_inheritable_components(psd, true)) {
973 status = add_directory_inheritable_components(
975 smb_fname->base_name,
978 if (!NT_STATUS_IS_OK(status)) {
984 * The underlying POSIX module always sets the
985 * ~SEC_DESC_DACL_PROTECTED bit, as ACLs can't be inherited in
986 * this way under POSIX. Remove it for Windows-style ACLs.
988 psd->type &= ~SEC_DESC_DACL_PROTECTED;
991 if (!(security_info & SECINFO_OWNER)) {
992 psd->owner_sid = NULL;
994 if (!(security_info & SECINFO_GROUP)) {
995 psd->group_sid = NULL;
997 if (!(security_info & SECINFO_DACL)) {
998 psd->type &= ~SEC_DESC_DACL_PRESENT;
1001 if (!(security_info & SECINFO_SACL)) {
1002 psd->type &= ~SEC_DESC_SACL_PRESENT;
1006 if (DEBUGLEVEL >= 10) {
1007 DEBUG(10,("get_nt_acl_internal: returning acl for %s is:\n",
1008 smb_fname->base_name ));
1009 NDR_PRINT_DEBUG(security_descriptor, psd);
1014 return NT_STATUS_OK;
1021 /*********************************************************************
1022 Fetch a security descriptor given an fsp.
1023 *********************************************************************/
1025 static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle,
1027 uint32_t security_info,
1028 TALLOC_CTX *mem_ctx,
1029 struct security_descriptor **ppdesc)
1031 return get_nt_acl_internal(handle, fsp,
1032 NULL, security_info, mem_ctx, ppdesc);
1035 /*********************************************************************
1036 Fetch a security descriptor given a pathname.
1037 *********************************************************************/
1039 static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
1040 const struct smb_filename *smb_fname,
1041 uint32_t security_info,
1042 TALLOC_CTX *mem_ctx,
1043 struct security_descriptor **ppdesc)
1045 return get_nt_acl_internal(handle,
1053 /*********************************************************************
1054 Set the underlying ACL (e.g. POSIX ACLS, POSIX owner, etc)
1055 *********************************************************************/
1056 static NTSTATUS set_underlying_acl(vfs_handle_struct *handle, files_struct *fsp,
1057 struct security_descriptor *psd,
1058 uint32_t security_info_sent,
1062 SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
1063 if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
1067 /* We got access denied here. If we're already root,
1068 or we didn't need to do a chown, or the fsp isn't
1069 open with WRITE_OWNER access, just return. */
1070 if (get_current_uid(handle->conn) == 0 || chown_needed == false ||
1071 !(fsp->access_mask & SEC_STD_WRITE_OWNER)) {
1072 return NT_STATUS_ACCESS_DENIED;
1075 DEBUG(10, ("fset_nt_acl_common: overriding chown on file %s "
1077 fsp_str_dbg(fsp), sid_string_tos(psd->owner_sid)));
1079 /* Ok, we failed to chown and we have
1080 SEC_STD_WRITE_OWNER access - override. */
1082 status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
1088 /*********************************************************************
1089 Store a v3 security descriptor
1090 *********************************************************************/
1091 static NTSTATUS store_v3_blob(vfs_handle_struct *handle, files_struct *fsp,
1092 struct security_descriptor *psd,
1093 struct security_descriptor *pdesc_next,
1094 uint8_t hash[XATTR_SD_HASH_SIZE])
1099 if (DEBUGLEVEL >= 10) {
1100 DEBUG(10, ("fset_nt_acl_xattr: storing xattr sd for file %s\n",
1103 security_descriptor,
1104 discard_const_p(struct security_descriptor, psd));
1106 if (pdesc_next != NULL) {
1107 DEBUG(10, ("fset_nt_acl_xattr: storing has in xattr sd "
1110 security_descriptor,
1111 discard_const_p(struct security_descriptor,
1115 ("fset_nt_acl_xattr: ignoring underlying sd\n"));
1118 status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
1119 if (!NT_STATUS_IS_OK(status)) {
1120 DEBUG(10, ("fset_nt_acl_xattr: create_acl_blob failed\n"));
1124 status = store_acl_blob_fsp(handle, fsp, &blob);
1128 /*********************************************************************
1129 Store a security descriptor given an fsp.
1130 *********************************************************************/
1132 static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
1133 uint32_t security_info_sent, const struct security_descriptor *orig_psd)
1137 DATA_BLOB blob, sys_acl_blob;
1138 struct security_descriptor *pdesc_next = NULL;
1139 struct security_descriptor *psd = NULL;
1140 uint8_t hash[XATTR_SD_HASH_SIZE];
1141 uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
1142 bool chown_needed = false;
1143 char *sys_acl_description;
1144 TALLOC_CTX *frame = talloc_stackframe();
1145 bool ignore_file_system_acl = lp_parm_bool(
1146 SNUM(handle->conn), ACL_MODULE_NAME, "ignore system acls", false);
1148 if (DEBUGLEVEL >= 10) {
1149 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
1151 NDR_PRINT_DEBUG(security_descriptor,
1152 discard_const_p(struct security_descriptor, orig_psd));
1155 status = get_nt_acl_internal(handle, fsp,
1157 SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
1161 if (!NT_STATUS_IS_OK(status)) {
1166 psd->revision = orig_psd->revision;
1167 /* All our SD's are self relative. */
1168 psd->type = orig_psd->type | SEC_DESC_SELF_RELATIVE;
1170 if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
1171 if (!dom_sid_equal(orig_psd->owner_sid, psd->owner_sid)) {
1172 /* We're changing the owner. */
1173 chown_needed = true;
1175 psd->owner_sid = orig_psd->owner_sid;
1177 if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
1178 if (!dom_sid_equal(orig_psd->group_sid, psd->group_sid)) {
1179 /* We're changing the group. */
1180 chown_needed = true;
1182 psd->group_sid = orig_psd->group_sid;
1184 if (security_info_sent & SECINFO_DACL) {
1185 if (security_descriptor_with_ms_nfs(orig_psd)) {
1187 * If the sd contains a MS NFS SID, do
1188 * nothing, it's a chmod() request from OS X
1189 * with AAPL context.
1192 return NT_STATUS_OK;
1194 psd->dacl = orig_psd->dacl;
1195 psd->type |= SEC_DESC_DACL_PRESENT;
1197 if (security_info_sent & SECINFO_SACL) {
1198 psd->sacl = orig_psd->sacl;
1199 psd->type |= SEC_DESC_SACL_PRESENT;
1202 if (ignore_file_system_acl) {
1204 /* send only ownership stuff to lower layer */
1205 security_info_sent &= (SECINFO_OWNER | SECINFO_GROUP);
1206 status = set_underlying_acl(handle, fsp, psd,
1207 security_info_sent, true);
1208 if (!NT_STATUS_IS_OK(status)) {
1214 status = store_v3_blob(handle, fsp, psd, NULL, hash);
1220 status = set_underlying_acl(handle, fsp, psd, security_info_sent,
1222 if (!NT_STATUS_IS_OK(status)) {
1227 /* Get the full underlying sd, then hash. */
1228 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
1234 if (!NT_STATUS_IS_OK(status)) {
1239 status = hash_sd_sha256(pdesc_next, hash);
1240 if (!NT_STATUS_IS_OK(status)) {
1245 /* Get the full underlying sd, then hash. */
1246 ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
1249 &sys_acl_description,
1252 /* If we fail to get the ACL blob (for some reason) then this
1253 * is not fatal, we just work based on the NT ACL only */
1255 status = store_v3_blob(handle, fsp, psd, pdesc_next, hash);
1261 status = hash_blob_sha256(sys_acl_blob, sys_acl_hash);
1262 if (!NT_STATUS_IS_OK(status)) {
1267 if (DEBUGLEVEL >= 10) {
1268 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s based on system ACL\n",
1270 NDR_PRINT_DEBUG(security_descriptor,
1271 discard_const_p(struct security_descriptor, psd));
1273 DEBUG(10,("fset_nt_acl_xattr: storing hash in xattr sd based on system ACL and:\n"));
1274 NDR_PRINT_DEBUG(security_descriptor,
1275 discard_const_p(struct security_descriptor, pdesc_next));
1278 /* We store hashes of both the sys ACL blob and the NT
1279 * security desciptor mapped from that ACL so as to improve
1280 * our chances against some inadvertant change breaking the
1282 status = create_sys_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash,
1283 sys_acl_description, sys_acl_hash);
1284 if (!NT_STATUS_IS_OK(status)) {
1285 DEBUG(10, ("fset_nt_acl_xattr: create_sys_acl_blob failed\n"));
1290 status = store_acl_blob_fsp(handle, fsp, &blob);
1296 static int acl_common_remove_object(vfs_handle_struct *handle,
1300 connection_struct *conn = handle->conn;
1302 files_struct *fsp = NULL;
1304 char *parent_dir = NULL;
1305 const char *final_component = NULL;
1306 struct smb_filename local_fname;
1307 int saved_errno = 0;
1308 char *saved_dir = NULL;
1310 saved_dir = vfs_GetWd(talloc_tos(),conn);
1312 saved_errno = errno;
1316 if (!parent_dirname(talloc_tos(), path,
1317 &parent_dir, &final_component)) {
1318 saved_errno = ENOMEM;
1322 DEBUG(10,("acl_common_remove_object: removing %s %s/%s\n",
1323 is_directory ? "directory" : "file",
1324 parent_dir, final_component ));
1326 /* cd into the parent dir to pin it. */
1327 ret = vfs_ChDir(conn, parent_dir);
1329 saved_errno = errno;
1333 ZERO_STRUCT(local_fname);
1334 local_fname.base_name = discard_const_p(char, final_component);
1336 /* Must use lstat here. */
1337 ret = SMB_VFS_LSTAT(conn, &local_fname);
1339 saved_errno = errno;
1343 /* Ensure we have this file open with DELETE access. */
1344 id = vfs_file_id_from_sbuf(conn, &local_fname.st);
1345 for (fsp = file_find_di_first(conn->sconn, id); fsp;
1346 fsp = file_find_di_next(fsp)) {
1347 if (fsp->access_mask & DELETE_ACCESS &&
1348 fsp->delete_on_close) {
1349 /* We did open this for delete,
1350 * allow the delete as root.
1357 DEBUG(10,("acl_common_remove_object: %s %s/%s "
1358 "not an open file\n",
1359 is_directory ? "directory" : "file",
1360 parent_dir, final_component ));
1361 saved_errno = EACCES;
1367 ret = SMB_VFS_NEXT_RMDIR(handle, &local_fname);
1369 ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
1374 saved_errno = errno;
1379 TALLOC_FREE(parent_dir);
1382 vfs_ChDir(conn, saved_dir);
1385 errno = saved_errno;
1390 static int rmdir_acl_common(struct vfs_handle_struct *handle,
1391 const struct smb_filename *smb_fname)
1395 /* Try the normal rmdir first. */
1396 ret = SMB_VFS_NEXT_RMDIR(handle, smb_fname);
1400 if (errno == EACCES || errno == EPERM) {
1401 /* Failed due to access denied,
1402 see if we need to root override. */
1403 return acl_common_remove_object(handle,
1404 smb_fname->base_name,
1408 DEBUG(10,("rmdir_acl_common: unlink of %s failed %s\n",
1409 smb_fname->base_name,
1414 static int unlink_acl_common(struct vfs_handle_struct *handle,
1415 const struct smb_filename *smb_fname)
1419 /* Try the normal unlink first. */
1420 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
1424 if (errno == EACCES || errno == EPERM) {
1425 /* Failed due to access denied,
1426 see if we need to root override. */
1428 /* Don't do anything fancy for streams. */
1429 if (smb_fname->stream_name) {
1432 return acl_common_remove_object(handle,
1433 smb_fname->base_name,
1437 DEBUG(10,("unlink_acl_common: unlink of %s failed %s\n",
1438 smb_fname->base_name,
1443 static int chmod_acl_module_common(struct vfs_handle_struct *handle,
1444 const struct smb_filename *smb_fname,
1447 if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
1448 /* Only allow this on POSIX pathnames. */
1449 return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
1454 static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
1455 struct files_struct *fsp, mode_t mode)
1457 if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1458 /* Only allow this on POSIX opens. */
1459 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1464 static int chmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1465 const struct smb_filename *smb_fname,
1468 if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
1469 /* Only allow this on POSIX pathnames. */
1470 return SMB_VFS_NEXT_CHMOD_ACL(handle, smb_fname, mode);
1475 static int fchmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1476 struct files_struct *fsp, mode_t mode)
1478 if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1479 /* Only allow this on POSIX opens. */
1480 return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);