libcli/security: move secdesc.c to the top level libcli/security
[ira/wip.git] / libcli / security / secdesc.c
diff --git a/libcli/security/secdesc.c b/libcli/security/secdesc.c
new file mode 100644 (file)
index 0000000..5d75f07
--- /dev/null
@@ -0,0 +1,719 @@
+/*
+ *  Unix SMB/Netbios implementation.
+ *  SEC_DESC handling functions
+ *  Copyright (C) Andrew Tridgell              1992-1998,
+ *  Copyright (C) Jeremy R. Allison            1995-2003.
+ *  Copyright (C) Luke Kenneth Casson Leighton 1996-1998,
+ *  Copyright (C) Paul Ashton                  1997-1998.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "includes.h"
+#include "librpc/gen_ndr/ndr_security.h"
+#include "libcli/security/security.h"
+
+#define ALL_SECURITY_INFORMATION (SECINFO_OWNER|SECINFO_GROUP|\
+                                       SECINFO_DACL|SECINFO_SACL|\
+                                       SECINFO_UNPROTECTED_SACL|\
+                                       SECINFO_UNPROTECTED_DACL|\
+                                       SECINFO_PROTECTED_SACL|\
+                                       SECINFO_PROTECTED_DACL)
+
+/* Map generic permissions to file object specific permissions */
+
+const struct generic_mapping file_generic_mapping = {
+       FILE_GENERIC_READ,
+       FILE_GENERIC_WRITE,
+       FILE_GENERIC_EXECUTE,
+       FILE_GENERIC_ALL
+};
+
+/*******************************************************************
+ Given a security_descriptor return the sec_info.
+********************************************************************/
+
+uint32_t get_sec_info(const struct security_descriptor *sd)
+{
+       uint32_t sec_info = ALL_SECURITY_INFORMATION;
+
+       SMB_ASSERT(sd);
+
+       if (sd->owner_sid == NULL) {
+               sec_info &= ~SECINFO_OWNER;
+       }
+       if (sd->group_sid == NULL) {
+               sec_info &= ~SECINFO_GROUP;
+       }
+       if (sd->sacl == NULL) {
+               sec_info &= ~SECINFO_SACL;
+       }
+       if (sd->dacl == NULL) {
+               sec_info &= ~SECINFO_DACL;
+       }
+
+       return sec_info;
+}
+
+
+/*******************************************************************
+ Merge part of security descriptor old_sec in to the empty sections of
+ security descriptor new_sec.
+********************************************************************/
+
+struct sec_desc_buf *sec_desc_merge_buf(TALLOC_CTX *ctx, struct sec_desc_buf *new_sdb, struct sec_desc_buf *old_sdb)
+{
+       struct dom_sid *owner_sid, *group_sid;
+       struct sec_desc_buf *return_sdb;
+       struct security_acl *dacl, *sacl;
+       struct security_descriptor *psd = NULL;
+       uint16_t secdesc_type;
+       size_t secdesc_size;
+
+       /* Copy over owner and group sids.  There seems to be no flag for
+          this so just check the pointer values. */
+
+       owner_sid = new_sdb->sd->owner_sid ? new_sdb->sd->owner_sid :
+               old_sdb->sd->owner_sid;
+
+       group_sid = new_sdb->sd->group_sid ? new_sdb->sd->group_sid :
+               old_sdb->sd->group_sid;
+
+       secdesc_type = new_sdb->sd->type;
+
+       /* Ignore changes to the system ACL.  This has the effect of making
+          changes through the security tab audit button not sticking.
+          Perhaps in future Samba could implement these settings somehow. */
+
+       sacl = NULL;
+       secdesc_type &= ~SEC_DESC_SACL_PRESENT;
+
+       /* Copy across discretionary ACL */
+
+       if (secdesc_type & SEC_DESC_DACL_PRESENT) {
+               dacl = new_sdb->sd->dacl;
+       } else {
+               dacl = old_sdb->sd->dacl;
+       }
+
+       /* Create new security descriptor from bits */
+
+       psd = make_sec_desc(ctx, new_sdb->sd->revision, secdesc_type,
+                           owner_sid, group_sid, sacl, dacl, &secdesc_size);
+
+       return_sdb = make_sec_desc_buf(ctx, secdesc_size, psd);
+
+       return(return_sdb);
+}
+
+struct security_descriptor *sec_desc_merge(TALLOC_CTX *ctx, struct security_descriptor *new_sdb, struct security_descriptor *old_sdb)
+{
+       struct dom_sid *owner_sid, *group_sid;
+       struct security_acl *dacl, *sacl;
+       struct security_descriptor *psd = NULL;
+       uint16_t secdesc_type;
+       size_t secdesc_size;
+
+       /* Copy over owner and group sids.  There seems to be no flag for
+          this so just check the pointer values. */
+
+       owner_sid = new_sdb->owner_sid ? new_sdb->owner_sid :
+               old_sdb->owner_sid;
+
+       group_sid = new_sdb->group_sid ? new_sdb->group_sid :
+               old_sdb->group_sid;
+
+       secdesc_type = new_sdb->type;
+
+       /* Ignore changes to the system ACL.  This has the effect of making
+          changes through the security tab audit button not sticking.
+          Perhaps in future Samba could implement these settings somehow. */
+
+       sacl = NULL;
+       secdesc_type &= ~SEC_DESC_SACL_PRESENT;
+
+       /* Copy across discretionary ACL */
+
+       if (secdesc_type & SEC_DESC_DACL_PRESENT) {
+               dacl = new_sdb->dacl;
+       } else {
+               dacl = old_sdb->dacl;
+       }
+
+       /* Create new security descriptor from bits */
+       psd = make_sec_desc(ctx, new_sdb->revision, secdesc_type,
+                           owner_sid, group_sid, sacl, dacl, &secdesc_size);
+
+       return psd;
+}
+
+/*******************************************************************
+ Creates a struct security_descriptor structure
+********************************************************************/
+
+#define  SEC_DESC_HEADER_SIZE (2 * sizeof(uint16_t) + 4 * sizeof(uint32_t))
+
+struct security_descriptor *make_sec_desc(TALLOC_CTX *ctx,
+                       enum security_descriptor_revision revision,
+                       uint16_t type,
+                       const struct dom_sid *owner_sid, const struct dom_sid *grp_sid,
+                       struct security_acl *sacl, struct security_acl *dacl, size_t *sd_size)
+{
+       struct security_descriptor *dst;
+       uint32_t offset     = 0;
+
+       *sd_size = 0;
+
+       if(( dst = talloc_zero(ctx, struct security_descriptor)) == NULL)
+               return NULL;
+
+       dst->revision = revision;
+       dst->type = type;
+
+       if (sacl)
+               dst->type |= SEC_DESC_SACL_PRESENT;
+       if (dacl)
+               dst->type |= SEC_DESC_DACL_PRESENT;
+
+       dst->owner_sid = NULL;
+       dst->group_sid   = NULL;
+       dst->sacl      = NULL;
+       dst->dacl      = NULL;
+
+       if(owner_sid && ((dst->owner_sid = dom_sid_dup(dst,owner_sid)) == NULL))
+               goto error_exit;
+
+       if(grp_sid && ((dst->group_sid = dom_sid_dup(dst,grp_sid)) == NULL))
+               goto error_exit;
+
+       if(sacl && ((dst->sacl = dup_sec_acl(dst, sacl)) == NULL))
+               goto error_exit;
+
+       if(dacl && ((dst->dacl = dup_sec_acl(dst, dacl)) == NULL))
+               goto error_exit;
+
+       offset = SEC_DESC_HEADER_SIZE;
+
+       /*
+        * Work out the linearization sizes.
+        */
+
+       if (dst->sacl != NULL) {
+               offset += dst->sacl->size;
+       }
+       if (dst->dacl != NULL) {
+               offset += dst->dacl->size;
+       }
+
+       if (dst->owner_sid != NULL) {
+               offset += ndr_size_dom_sid(dst->owner_sid, 0);
+       }
+
+       if (dst->group_sid != NULL) {
+               offset += ndr_size_dom_sid(dst->group_sid, 0);
+       }
+
+       *sd_size = (size_t)offset;
+       return dst;
+
+error_exit:
+
+       *sd_size = 0;
+       return NULL;
+}
+
+/*******************************************************************
+ Duplicate a struct security_descriptor structure.
+********************************************************************/
+
+struct security_descriptor *dup_sec_desc(TALLOC_CTX *ctx, const struct security_descriptor *src)
+{
+       size_t dummy;
+
+       if(src == NULL)
+               return NULL;
+
+       return make_sec_desc( ctx, src->revision, src->type,
+                               src->owner_sid, src->group_sid, src->sacl,
+                               src->dacl, &dummy);
+}
+
+/*******************************************************************
+ Convert a secdesc into a byte stream
+********************************************************************/
+NTSTATUS marshall_sec_desc(TALLOC_CTX *mem_ctx,
+                          struct security_descriptor *secdesc,
+                          uint8_t **data, size_t *len)
+{
+       DATA_BLOB blob;
+       enum ndr_err_code ndr_err;
+
+       ndr_err = ndr_push_struct_blob(
+               &blob, mem_ctx, secdesc,
+               (ndr_push_flags_fn_t)ndr_push_security_descriptor);
+
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               DEBUG(0, ("ndr_push_security_descriptor failed: %s\n",
+                         ndr_errstr(ndr_err)));
+               return ndr_map_error2ntstatus(ndr_err);
+       }
+
+       *data = blob.data;
+       *len = blob.length;
+       return NT_STATUS_OK;
+}
+
+/*******************************************************************
+ Convert a secdesc_buf into a byte stream
+********************************************************************/
+
+NTSTATUS marshall_sec_desc_buf(TALLOC_CTX *mem_ctx,
+                              struct sec_desc_buf *secdesc_buf,
+                              uint8_t **data, size_t *len)
+{
+       DATA_BLOB blob;
+       enum ndr_err_code ndr_err;
+
+       ndr_err = ndr_push_struct_blob(
+               &blob, mem_ctx, secdesc_buf,
+               (ndr_push_flags_fn_t)ndr_push_sec_desc_buf);
+
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               DEBUG(0, ("ndr_push_sec_desc_buf failed: %s\n",
+                         ndr_errstr(ndr_err)));
+               return ndr_map_error2ntstatus(ndr_err);
+       }
+
+       *data = blob.data;
+       *len = blob.length;
+       return NT_STATUS_OK;
+}
+
+/*******************************************************************
+ Parse a byte stream into a secdesc
+********************************************************************/
+NTSTATUS unmarshall_sec_desc(TALLOC_CTX *mem_ctx, uint8_t *data, size_t len,
+                            struct security_descriptor **psecdesc)
+{
+       DATA_BLOB blob;
+       enum ndr_err_code ndr_err;
+       struct security_descriptor *result;
+
+       if ((data == NULL) || (len == 0)) {
+               return NT_STATUS_INVALID_PARAMETER;
+       }
+
+       result = talloc_zero(mem_ctx, struct security_descriptor);
+       if (result == NULL) {
+               return NT_STATUS_NO_MEMORY;
+       }
+
+       blob = data_blob_const(data, len);
+
+       ndr_err = ndr_pull_struct_blob(&blob, result, result,
+               (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
+
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               DEBUG(0, ("ndr_pull_security_descriptor failed: %s\n",
+                         ndr_errstr(ndr_err)));
+               TALLOC_FREE(result);
+               return ndr_map_error2ntstatus(ndr_err);
+       }
+
+       *psecdesc = result;
+       return NT_STATUS_OK;
+}
+
+/*******************************************************************
+ Parse a byte stream into a sec_desc_buf
+********************************************************************/
+
+NTSTATUS unmarshall_sec_desc_buf(TALLOC_CTX *mem_ctx, uint8_t *data, size_t len,
+                                struct sec_desc_buf **psecdesc_buf)
+{
+       DATA_BLOB blob;
+       enum ndr_err_code ndr_err;
+       struct sec_desc_buf *result;
+
+       if ((data == NULL) || (len == 0)) {
+               return NT_STATUS_INVALID_PARAMETER;
+       }
+
+       result = talloc_zero(mem_ctx, struct sec_desc_buf);
+       if (result == NULL) {
+               return NT_STATUS_NO_MEMORY;
+       }
+
+       blob = data_blob_const(data, len);
+
+       ndr_err = ndr_pull_struct_blob(&blob, result, result,
+               (ndr_pull_flags_fn_t)ndr_pull_sec_desc_buf);
+
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               DEBUG(0, ("ndr_pull_sec_desc_buf failed: %s\n",
+                         ndr_errstr(ndr_err)));
+               TALLOC_FREE(result);
+               return ndr_map_error2ntstatus(ndr_err);
+       }
+
+       *psecdesc_buf = result;
+       return NT_STATUS_OK;
+}
+
+/*******************************************************************
+ Creates a struct security_descriptor structure with typical defaults.
+********************************************************************/
+
+struct security_descriptor *make_standard_sec_desc(TALLOC_CTX *ctx, const struct dom_sid *owner_sid, const struct dom_sid *grp_sid,
+                                struct security_acl *dacl, size_t *sd_size)
+{
+       return make_sec_desc(ctx, SECURITY_DESCRIPTOR_REVISION_1,
+                            SEC_DESC_SELF_RELATIVE, owner_sid, grp_sid, NULL,
+                            dacl, sd_size);
+}
+
+/*******************************************************************
+ Creates a struct sec_desc_buf structure.
+********************************************************************/
+
+struct sec_desc_buf *make_sec_desc_buf(TALLOC_CTX *ctx, size_t len, struct security_descriptor *sec_desc)
+{
+       struct sec_desc_buf *dst;
+
+       if((dst = talloc_zero(ctx, struct sec_desc_buf)) == NULL)
+               return NULL;
+
+       /* max buffer size (allocated size) */
+       dst->sd_size = (uint32_t)len;
+
+       if(sec_desc && ((dst->sd = dup_sec_desc(ctx, sec_desc)) == NULL)) {
+               return NULL;
+       }
+
+       return dst;
+}
+
+/*******************************************************************
+ Duplicates a struct sec_desc_buf structure.
+********************************************************************/
+
+struct sec_desc_buf *dup_sec_desc_buf(TALLOC_CTX *ctx, struct sec_desc_buf *src)
+{
+       if(src == NULL)
+               return NULL;
+
+       return make_sec_desc_buf( ctx, src->sd_size, src->sd);
+}
+
+/*******************************************************************
+ Add a new SID with its permissions to struct security_descriptor.
+********************************************************************/
+
+NTSTATUS sec_desc_add_sid(TALLOC_CTX *ctx, struct security_descriptor **psd, const struct dom_sid *sid, uint32_t mask, size_t *sd_size)
+{
+       struct security_descriptor *sd   = 0;
+       struct security_acl  *dacl = 0;
+       struct security_ace  *ace  = 0;
+       NTSTATUS  status;
+
+       if (!ctx || !psd || !sid || !sd_size)
+               return NT_STATUS_INVALID_PARAMETER;
+
+       *sd_size = 0;
+
+       status = sec_ace_add_sid(ctx, &ace, psd[0]->dacl->aces, &psd[0]->dacl->num_aces, sid, mask);
+
+       if (!NT_STATUS_IS_OK(status))
+               return status;
+
+       if (!(dacl = make_sec_acl(ctx, psd[0]->dacl->revision, psd[0]->dacl->num_aces, ace)))
+               return NT_STATUS_UNSUCCESSFUL;
+
+       if (!(sd = make_sec_desc(ctx, psd[0]->revision, psd[0]->type, psd[0]->owner_sid,
+               psd[0]->group_sid, psd[0]->sacl, dacl, sd_size)))
+               return NT_STATUS_UNSUCCESSFUL;
+
+       *psd = sd;
+        sd  = 0;
+       return NT_STATUS_OK;
+}
+
+/*******************************************************************
+ Modify a SID's permissions in a struct security_descriptor.
+********************************************************************/
+
+NTSTATUS sec_desc_mod_sid(struct security_descriptor *sd, struct dom_sid *sid, uint32_t mask)
+{
+       NTSTATUS status;
+
+       if (!sd || !sid)
+               return NT_STATUS_INVALID_PARAMETER;
+
+       status = sec_ace_mod_sid(sd->dacl->aces, sd->dacl->num_aces, sid, mask);
+
+       if (!NT_STATUS_IS_OK(status))
+               return status;
+
+       return NT_STATUS_OK;
+}
+
+/*******************************************************************
+ Delete a SID from a struct security_descriptor.
+********************************************************************/
+
+NTSTATUS sec_desc_del_sid(TALLOC_CTX *ctx, struct security_descriptor **psd, struct dom_sid *sid, size_t *sd_size)
+{
+       struct security_descriptor *sd   = 0;
+       struct security_acl  *dacl = 0;
+       struct security_ace  *ace  = 0;
+       NTSTATUS  status;
+
+       if (!ctx || !psd[0] || !sid || !sd_size)
+               return NT_STATUS_INVALID_PARAMETER;
+
+       *sd_size = 0;
+
+       status = sec_ace_del_sid(ctx, &ace, psd[0]->dacl->aces, &psd[0]->dacl->num_aces, sid);
+
+       if (!NT_STATUS_IS_OK(status))
+               return status;
+
+       if (!(dacl = make_sec_acl(ctx, psd[0]->dacl->revision, psd[0]->dacl->num_aces, ace)))
+               return NT_STATUS_UNSUCCESSFUL;
+
+       if (!(sd = make_sec_desc(ctx, psd[0]->revision, psd[0]->type, psd[0]->owner_sid,
+               psd[0]->group_sid, psd[0]->sacl, dacl, sd_size)))
+               return NT_STATUS_UNSUCCESSFUL;
+
+       *psd = sd;
+        sd  = 0;
+       return NT_STATUS_OK;
+}
+
+/*
+ * Determine if an struct security_ace is inheritable
+ */
+
+static bool is_inheritable_ace(const struct security_ace *ace,
+                               bool container)
+{
+       if (!container) {
+               return ((ace->flags & SEC_ACE_FLAG_OBJECT_INHERIT) != 0);
+       }
+
+       if (ace->flags & SEC_ACE_FLAG_CONTAINER_INHERIT) {
+               return true;
+       }
+
+       if ((ace->flags & SEC_ACE_FLAG_OBJECT_INHERIT) &&
+                       !(ace->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT)) {
+               return true;
+       }
+
+       return false;
+}
+
+/*
+ * Does a security descriptor have any inheritable components for
+ * the newly created type ?
+ */
+
+bool sd_has_inheritable_components(const struct security_descriptor *parent_ctr, bool container)
+{
+       unsigned int i;
+       const struct security_acl *the_acl = parent_ctr->dacl;
+
+       for (i = 0; i < the_acl->num_aces; i++) {
+               const struct security_ace *ace = &the_acl->aces[i];
+
+               if (is_inheritable_ace(ace, container)) {
+                       return true;
+               }
+       }
+       return false;
+}
+
+/* Create a child security descriptor using another security descriptor as
+   the parent container.  This child object can either be a container or
+   non-container object. */
+
+NTSTATUS se_create_child_secdesc(TALLOC_CTX *ctx,
+                                       struct security_descriptor **ppsd,
+                                       size_t *psize,
+                                       const struct security_descriptor *parent_ctr,
+                                       const struct dom_sid *owner_sid,
+                                       const struct dom_sid *group_sid,
+                                       bool container)
+{
+       struct security_acl *new_dacl = NULL, *the_acl = NULL;
+       struct security_ace *new_ace_list = NULL;
+       unsigned int new_ace_list_ndx = 0, i;
+
+       TALLOC_CTX *frame;
+
+       *ppsd = NULL;
+       *psize = 0;
+
+       /* Currently we only process the dacl when creating the child.  The
+          sacl should also be processed but this is left out as sacls are
+          not implemented in Samba at the moment.*/
+
+       the_acl = parent_ctr->dacl;
+
+       if (the_acl->num_aces) {
+               if (2*the_acl->num_aces < the_acl->num_aces) {
+                       return NT_STATUS_NO_MEMORY;
+               }
+
+               if (!(new_ace_list = talloc_array(ctx, struct security_ace,
+                                                 2*the_acl->num_aces))) {
+                       return NT_STATUS_NO_MEMORY;
+               }
+       } else {
+               new_ace_list = NULL;
+       }
+
+       frame = talloc_stackframe();
+
+       for (i = 0; i < the_acl->num_aces; i++) {
+               const struct security_ace *ace = &the_acl->aces[i];
+               struct security_ace *new_ace = &new_ace_list[new_ace_list_ndx];
+               const struct dom_sid *ptrustee = &ace->trustee;
+               const struct dom_sid *creator = NULL;
+               uint8_t new_flags = ace->flags;
+
+               if (!is_inheritable_ace(ace, container)) {
+                       continue;
+               }
+
+               /* see the RAW-ACLS inheritance test for details on these rules */
+               if (!container) {
+                       new_flags = 0;
+               } else {
+                       new_flags &= ~SEC_ACE_FLAG_INHERIT_ONLY;
+
+                       if (!(new_flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
+                               new_flags |= SEC_ACE_FLAG_INHERIT_ONLY;
+                       }
+                       if (new_flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
+                               new_flags = 0;
+                       }
+               }
+
+               /* The CREATOR sids are special when inherited */
+               if (dom_sid_equal(ptrustee, &global_sid_Creator_Owner)) {
+                       creator = &global_sid_Creator_Owner;
+                       ptrustee = owner_sid;
+               } else if (dom_sid_equal(ptrustee, &global_sid_Creator_Group)) {
+                       creator = &global_sid_Creator_Group;
+                       ptrustee = group_sid;
+               }
+
+               if (creator && container &&
+                               (new_flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
+
+                       /* First add the regular ACE entry. */
+                       init_sec_ace(new_ace, ptrustee, ace->type,
+                               ace->access_mask, 0);
+
+                       DEBUG(5,("se_create_child_secdesc(): %s:%d/0x%02x/0x%08x"
+                                " inherited as %s:%d/0x%02x/0x%08x\n",
+                                dom_sid_string(frame, &ace->trustee),
+                                ace->type, ace->flags, ace->access_mask,
+                                dom_sid_string(frame, &new_ace->trustee),
+                                new_ace->type, new_ace->flags,
+                                new_ace->access_mask));
+
+                       new_ace_list_ndx++;
+
+                       /* Now add the extra creator ACE. */
+                       new_ace = &new_ace_list[new_ace_list_ndx];
+
+                       ptrustee = creator;
+                       new_flags |= SEC_ACE_FLAG_INHERIT_ONLY;
+
+               } else if (container &&
+                               !(ace->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT)) {
+                       ptrustee = &ace->trustee;
+               }
+
+               init_sec_ace(new_ace, ptrustee, ace->type,
+                            ace->access_mask, new_flags);
+
+               DEBUG(5, ("se_create_child_secdesc(): %s:%d/0x%02x/0x%08x "
+                         " inherited as %s:%d/0x%02x/0x%08x\n",
+                         dom_sid_string(frame, &ace->trustee),
+                         ace->type, ace->flags, ace->access_mask,
+                         dom_sid_string(frame, &ace->trustee),
+                         new_ace->type, new_ace->flags,
+                         new_ace->access_mask));
+
+               new_ace_list_ndx++;
+       }
+
+       talloc_free(frame);
+
+       /* Create child security descriptor to return */
+       if (new_ace_list_ndx) {
+               new_dacl = make_sec_acl(ctx,
+                               NT4_ACL_REVISION,
+                               new_ace_list_ndx,
+                               new_ace_list);
+
+               if (!new_dacl) {
+                       return NT_STATUS_NO_MEMORY;
+               }
+       }
+
+       *ppsd = make_sec_desc(ctx,
+                       SECURITY_DESCRIPTOR_REVISION_1,
+                       SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
+                       owner_sid,
+                       group_sid,
+                       NULL,
+                       new_dacl,
+                       psize);
+       if (!*ppsd) {
+               return NT_STATUS_NO_MEMORY;
+       }
+       return NT_STATUS_OK;
+}
+
+NTSTATUS se_create_child_secdesc_buf(TALLOC_CTX *ctx,
+                                       struct sec_desc_buf **ppsdb,
+                                       const struct security_descriptor *parent_ctr,
+                                       bool container)
+{
+       NTSTATUS status;
+       size_t size = 0;
+       struct security_descriptor *sd = NULL;
+
+       *ppsdb = NULL;
+       status = se_create_child_secdesc(ctx,
+                                       &sd,
+                                       &size,
+                                       parent_ctr,
+                                       parent_ctr->owner_sid,
+                                       parent_ctr->group_sid,
+                                       container);
+       if (!NT_STATUS_IS_OK(status)) {
+               return status;
+       }
+
+       *ppsdb = make_sec_desc_buf(ctx, size, sd);
+       if (!*ppsdb) {
+               return NT_STATUS_NO_MEMORY;
+       }
+       return NT_STATUS_OK;
+}