Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1843 insertions, 0 deletions

diff --git a/lib/ldb-samba/ldif_handlers.c b/lib/ldb-samba/ldif_handlers.c
new file mode 100644
index 0000000..c30fd63
--- /dev/null
+++ b/lib/ldb-samba/ldif_handlers.c
@@ -0,0 +1,1843 @@
+/*
+   ldb database library - ldif handlers for Samba
+
+   Copyright (C) Andrew Tridgell 2005
+   Copyright (C) Andrew Bartlett 2006-2009
+   Copyright (C) Matthias Dieter Wallnöfer 2009
+     ** NOTE! The following LGPL license applies to the ldb
+     ** library. This does NOT imply that all of Samba is released
+     ** under the LGPL
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include <ldb.h>
+#include <ldb_module.h>
+#include "ldb_handlers.h"
+#include "dsdb/samdb/samdb.h"
+#include "dsdb/common/util.h"
+#include "librpc/gen_ndr/ndr_security.h"
+#include "librpc/gen_ndr/ndr_misc.h"
+#include "librpc/gen_ndr/ndr_drsblobs.h"
+#include "librpc/gen_ndr/ndr_dnsp.h"
+#include "librpc/ndr/libndr.h"
+#include "libcli/security/security.h"
+#include "param/param.h"
+#include "../lib/util/asn1.h"
+#include "lib/util/smb_strtox.h"
+
+/*
+  use ndr_print_* to convert a NDR formatted blob to a ldif formatted blob
+
+  If mask_errors is true, then function succeeds but out data
+  is set to "<Unable to decode binary data>" message
+
+  \return 0 on success; -1 on error
+*/
+static int ldif_write_NDR(struct ldb_context *ldb, void *mem_ctx,
+			  const struct ldb_val *in, struct ldb_val *out,
+			  size_t struct_size,
+			  ndr_pull_flags_fn_t pull_fn,
+			  ndr_print_fn_t print_fn,
+			  bool mask_errors)
+{
+	uint8_t *p;
+	enum ndr_err_code err;
+	if (!(ldb_get_flags(ldb) & LDB_FLG_SHOW_BINARY)) {
+		return ldb_handler_copy(ldb, mem_ctx, in, out);
+	}
+	p = talloc_size(mem_ctx, struct_size);
+	err = ndr_pull_struct_blob(in, mem_ctx,
+				   p, pull_fn);
+	if (err != NDR_ERR_SUCCESS) {
+		/* fail in not in mask_error mode */
+		if (!mask_errors) {
+			return -1;
+		}
+		talloc_free(p);
+		out->data = (uint8_t *)talloc_strdup(mem_ctx, "<Unable to decode binary data>");
+		out->length = strlen((const char *)out->data);
+		return 0;
+	}
+	out->data = (uint8_t *)ndr_print_struct_string(mem_ctx, print_fn, "NDR", p);
+	talloc_free(p);
+	if (out->data == NULL) {
+		return ldb_handler_copy(ldb, mem_ctx, in, out);
+	}
+	out->length = strlen((char *)out->data);
+	return 0;
+}
+
+/*
+  convert a ldif formatted objectSid to a NDR formatted blob
+*/
+static int ldif_read_objectSid(struct ldb_context *ldb, void *mem_ctx,
+			       const struct ldb_val *in, struct ldb_val *out)
+{
+	bool ret;
+	enum ndr_err_code ndr_err;
+	struct dom_sid sid;
+	if (in->length > DOM_SID_STR_BUFLEN) {
+		return -1;
+	} else {
+		char p[in->length+1];
+		memcpy(p, in->data, in->length);
+		p[in->length] = '\0';
+
+		ret = dom_sid_parse(p, &sid);
+		if (ret == false) {
+			return -1;
+		}
+
+		*out = data_blob_talloc(mem_ctx, NULL,
+					ndr_size_dom_sid(&sid, 0));
+		if (out->data == NULL) {
+			return -1;
+		}
+
+		ndr_err = ndr_push_struct_into_fixed_blob(out, &sid,
+				(ndr_push_flags_fn_t)ndr_push_dom_sid);
+		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+			return -1;
+		}
+	}
+	return 0;
+}
+
+/*
+  convert a NDR formatted blob to a ldif formatted objectSid
+*/
+int ldif_write_objectSid(struct ldb_context *ldb, void *mem_ctx,
+				const struct ldb_val *in, struct ldb_val *out)
+{
+	struct dom_sid sid;
+	enum ndr_err_code ndr_err;
+
+	ndr_err = ndr_pull_struct_blob_all_noalloc(in, &sid,
+					   (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		return -1;
+	}
+	*out = data_blob_string_const(dom_sid_string(mem_ctx, &sid));
+	if (out->data == NULL) {
+		return -1;
+	}
+	return 0;
+}
+
+bool ldif_comparision_objectSid_isString(const struct ldb_val *v)
+{
+	if (v->length < 3) {
+		return false;
+	}
+
+	if (strncmp("S-", (const char *)v->data, 2) != 0) return false;
+
+	return true;
+}
+
+/*
+  compare two objectSids
+*/
+static int ldif_comparison_objectSid(struct ldb_context *ldb, void *mem_ctx,
+				    const struct ldb_val *v1, const struct ldb_val *v2)
+{
+	if (ldif_comparision_objectSid_isString(v1) && ldif_comparision_objectSid_isString(v2)) {
+		return ldb_comparison_binary(ldb, mem_ctx, v1, v2);
+	} else if (ldif_comparision_objectSid_isString(v1)
+		   && !ldif_comparision_objectSid_isString(v2)) {
+		struct ldb_val v;
+		int ret;
+		if (ldif_read_objectSid(ldb, mem_ctx, v1, &v) != 0) {
+			/* Perhaps not a string after all */
+			return ldb_comparison_binary(ldb, mem_ctx, v1, v2);
+		}
+		ret = ldb_comparison_binary(ldb, mem_ctx, &v, v2);
+		talloc_free(v.data);
+		return ret;
+	} else if (!ldif_comparision_objectSid_isString(v1)
+		   && ldif_comparision_objectSid_isString(v2)) {
+		struct ldb_val v;
+		int ret;
+		if (ldif_read_objectSid(ldb, mem_ctx, v2, &v) != 0) {
+			/* Perhaps not a string after all */
+			return ldb_comparison_binary(ldb, mem_ctx, v1, v2);
+		}
+		ret = ldb_comparison_binary(ldb, mem_ctx, v1, &v);
+		talloc_free(v.data);
+		return ret;
+	}
+	return ldb_comparison_binary(ldb, mem_ctx, v1, v2);
+}
+
+/*
+  canonicalise a objectSid
+*/
+static int ldif_canonicalise_objectSid(struct ldb_context *ldb, void *mem_ctx,
+				      const struct ldb_val *in, struct ldb_val *out)
+{
+	if (ldif_comparision_objectSid_isString(in)) {
+		if (ldif_read_objectSid(ldb, mem_ctx, in, out) != 0) {
+			/* Perhaps not a string after all */
+			return ldb_handler_copy(ldb, mem_ctx, in, out);
+		}
+		return 0;
+	}
+	return ldb_handler_copy(ldb, mem_ctx, in, out);
+}
+
+static int extended_dn_read_SID(struct ldb_context *ldb, void *mem_ctx,
+			      const struct ldb_val *in, struct ldb_val *out)
+{
+	struct dom_sid sid;
+	enum ndr_err_code ndr_err;
+	if (ldif_comparision_objectSid_isString(in)) {
+		if (ldif_read_objectSid(ldb, mem_ctx, in, out) == 0) {
+			return 0;
+		}
+	}
+
+	/* Perhaps not a string after all */
+	*out = data_blob_talloc(mem_ctx, NULL, in->length/2+1);
+
+	if (!out->data) {
+		return -1;
+	}
+
+	(*out).length = strhex_to_str((char *)out->data, out->length,
+				     (const char *)in->data, in->length);
+
+	/* Check it looks like a SID */
+	ndr_err = ndr_pull_struct_blob_all_noalloc(out, &sid,
+					   (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		return -1;
+	}
+	return 0;
+}
+
+/*
+  convert a ldif formatted objectGUID to a NDR formatted blob
+*/
+static int ldif_read_objectGUID(struct ldb_context *ldb, void *mem_ctx,
+			        const struct ldb_val *in, struct ldb_val *out)
+{
+	struct GUID guid;
+	NTSTATUS status;
+
+	status = GUID_from_data_blob(in, &guid);
+	if (!NT_STATUS_IS_OK(status)) {
+		return -1;
+	}
+
+	status = GUID_to_ndr_blob(&guid, mem_ctx, out);
+	if (!NT_STATUS_IS_OK(status)) {
+		return -1;
+	}
+	return 0;
+}
+
+/*
+  convert a NDR formatted blob to a ldif formatted objectGUID
+*/
+static int ldif_write_objectGUID(struct ldb_context *ldb, void *mem_ctx,
+				 const struct ldb_val *in, struct ldb_val *out)
+{
+	struct GUID guid;
+	NTSTATUS status;
+
+	status = GUID_from_ndr_blob(in, &guid);
+	if (!NT_STATUS_IS_OK(status)) {
+		return -1;
+	}
+	out->data = (uint8_t *)GUID_string(mem_ctx, &guid);
+	if (out->data == NULL) {
+		return -1;
+	}
+	out->length = strlen((const char *)out->data);
+	return 0;
+}
+
+static bool ldif_comparision_objectGUID_isString(const struct ldb_val *v)
+{
+	if (v->length != 36 && v->length != 38) return false;
+
+	/* Might be a GUID string, can't be a binary GUID (fixed 16 bytes) */
+	return true;
+}
+
+static int extended_dn_read_GUID(struct ldb_context *ldb, void *mem_ctx,
+			      const struct ldb_val *in, struct ldb_val *out)
+{
+
+	if (in->length == 36 && ldif_read_objectGUID(ldb, mem_ctx, in, out) == 0) {
+		return 0;
+	}
+
+	/* Try as 'hex' form */
+	if (in->length != 32) {
+		return -1;
+	}
+
+	*out = data_blob_talloc(mem_ctx, NULL, in->length/2+1);
+
+	if (!out->data) {
+		return -1;
+	}
+
+	(*out).length = strhex_to_str((char *)out->data, out->length,
+				      (const char *)in->data, in->length);
+
+	/* Check it looks like a GUID */
+	if ((*out).length != 16) {
+		data_blob_free(out);
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+  compare two objectGUIDs
+*/
+static int ldif_comparison_objectGUID(struct ldb_context *ldb, void *mem_ctx,
+				     const struct ldb_val *v1, const struct ldb_val *v2)
+{
+	if (ldif_comparision_objectGUID_isString(v1) && ldif_comparision_objectGUID_isString(v2)) {
+		return ldb_comparison_binary(ldb, mem_ctx, v1, v2);
+	} else if (ldif_comparision_objectGUID_isString(v1)
+		   && !ldif_comparision_objectGUID_isString(v2)) {
+		struct ldb_val v;
+		int ret;
+		if (ldif_read_objectGUID(ldb, mem_ctx, v1, &v) != 0) {
+			/* Perhaps it wasn't a valid string after all */
+			return ldb_comparison_binary(ldb, mem_ctx, v1, v2);
+		}
+		ret = ldb_comparison_binary(ldb, mem_ctx, &v, v2);
+		talloc_free(v.data);
+		return ret;
+	} else if (!ldif_comparision_objectGUID_isString(v1)
+		   && ldif_comparision_objectGUID_isString(v2)) {
+		struct ldb_val v;
+		int ret;
+		if (ldif_read_objectGUID(ldb, mem_ctx, v2, &v) != 0) {
+			/* Perhaps it wasn't a valid string after all */
+			return ldb_comparison_binary(ldb, mem_ctx, v1, v2);
+		}
+		ret = ldb_comparison_binary(ldb, mem_ctx, v1, &v);
+		talloc_free(v.data);
+		return ret;
+	}
+	return ldb_comparison_binary(ldb, mem_ctx, v1, v2);
+}
+
+/*
+  canonicalise a objectGUID
+*/
+static int ldif_canonicalise_objectGUID(struct ldb_context *ldb, void *mem_ctx,
+				       const struct ldb_val *in, struct ldb_val *out)
+{
+	if (ldif_comparision_objectGUID_isString(in)) {
+		if (ldif_read_objectGUID(ldb, mem_ctx, in, out) != 0) {
+			/* Perhaps it wasn't a valid string after all */
+			return ldb_handler_copy(ldb, mem_ctx, in, out);
+		}
+		return 0;
+	}
+	return ldb_handler_copy(ldb, mem_ctx, in, out);
+}
+
+
+/*
+  convert a ldif (SDDL) formatted ntSecurityDescriptor to a NDR formatted blob
+*/
+static int ldif_read_ntSecurityDescriptor(struct ldb_context *ldb, void *mem_ctx,
+					  const struct ldb_val *in, struct ldb_val *out)
+{
+	struct security_descriptor *sd;
+	enum ndr_err_code ndr_err;
+
+	if (in->length >= 2 && isupper(in->data[0]) && in->data[1] == ':') {
+		/*
+		 * If it starts with an upper case character followed by ':',
+		 * we know it's not NDR, but most likely SDDL...
+		 */
+		const struct dom_sid *sid = samdb_domain_sid(ldb);
+
+		sd = sddl_decode(mem_ctx, (const char *)in->data, sid);
+		if (sd == NULL) {
+			return -1;
+		}
+
+		goto decoded;
+	}
+
+	sd = talloc(mem_ctx, struct security_descriptor);
+	if (sd == NULL) {
+		return -1;
+	}
+
+	ndr_err = ndr_pull_struct_blob(in, sd, sd,
+				       (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		talloc_free(sd);
+		return -1;
+	}
+
+decoded:
+	ndr_err = ndr_push_struct_blob(out, mem_ctx, sd,
+				       (ndr_push_flags_fn_t)ndr_push_security_descriptor);
+	talloc_free(sd);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+  convert a NDR formatted blob to a ldif formatted ntSecurityDescriptor (SDDL format)
+*/
+static int ldif_write_ntSecurityDescriptor(struct ldb_context *ldb, void *mem_ctx,
+					   const struct ldb_val *in, struct ldb_val *out)
+{
+	struct security_descriptor *sd;
+	enum ndr_err_code ndr_err;
+
+	if (ldb_get_flags(ldb) & LDB_FLG_SHOW_BINARY) {
+		return ldif_write_NDR(ldb, mem_ctx, in, out,
+				      sizeof(struct security_descriptor),
+				      (ndr_pull_flags_fn_t)ndr_pull_security_descriptor,
+				      (ndr_print_fn_t)ndr_print_security_descriptor,
+				      true);
+
+	}
+
+	sd = talloc(mem_ctx, struct security_descriptor);
+	if (sd == NULL) {
+		return -1;
+	}
+	/* We can't use ndr_pull_struct_blob_all because this contains relative pointers */
+	ndr_err = ndr_pull_struct_blob(in, sd, sd,
+					   (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		talloc_free(sd);
+		return -1;
+	}
+	out->data = (uint8_t *)sddl_encode(mem_ctx, sd, samdb_domain_sid_cache_only(ldb));
+	talloc_free(sd);
+	if (out->data == NULL) {
+		return -1;
+	}
+	out->length = strlen((const char *)out->data);
+	return 0;
+}
+
+/*
+  convert a string formatted SDDL to a ldif formatted ntSecurityDescriptor (SDDL format)
+*/
+static int ldif_write_sddlSecurityDescriptor(struct ldb_context *ldb, void *mem_ctx,
+					   const struct ldb_val *in, struct ldb_val *out)
+{
+	if (ldb_get_flags(ldb) & LDB_FLG_SHOW_BINARY) {
+		struct security_descriptor *sd;
+		const struct dom_sid *sid = samdb_domain_sid(ldb);
+
+		sd = sddl_decode(mem_ctx, (const char *)in->data, sid);
+		out->data = (uint8_t *)ndr_print_struct_string(mem_ctx,
+					(ndr_print_fn_t)ndr_print_security_descriptor,
+					"SDDL", sd);
+		out->length = strlen((const char *)out->data);
+		talloc_free(sd);
+		return 0;
+	}
+
+	return ldb_handler_copy(ldb, mem_ctx, in, out);
+}
+
+/*
+   canonicalise an objectCategory.  We use the long form as the canonical form:
+   'person' becomes cn=Person,cn=Schema,cn=Configuration,<basedn>
+
+   Also any short name of an objectClass that points to a different
+   class (such as user) has the canonical form of the class it's
+   defaultObjectCategory points to (eg
+   cn=Person,cn=Schema,cn=Configuration,<basedn>)
+*/
+
+static int ldif_canonicalise_objectCategory(struct ldb_context *ldb, void *mem_ctx,
+					    const struct ldb_val *in, struct ldb_val *out)
+{
+	struct ldb_dn *dn1 = NULL;
+	const struct dsdb_schema *schema = dsdb_get_schema(ldb, NULL);
+	const struct dsdb_class *sclass;
+	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+	if (!tmp_ctx) {
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+
+	if (!schema) {
+		talloc_free(tmp_ctx);
+		*out = data_blob_talloc(mem_ctx, in->data, in->length);
+		if (in->data && !out->data) {
+			return LDB_ERR_OPERATIONS_ERROR;
+		}
+		return LDB_SUCCESS;
+	}
+	dn1 = ldb_dn_from_ldb_val(tmp_ctx, ldb, in);
+	if ( ! ldb_dn_validate(dn1)) {
+		const char *lDAPDisplayName = talloc_strndup(tmp_ctx, (char *)in->data, in->length);
+		sclass = dsdb_class_by_lDAPDisplayName(schema, lDAPDisplayName);
+		if (sclass) {
+			struct ldb_dn *dn = ldb_dn_new(tmp_ctx, ldb,
+						       sclass->defaultObjectCategory);
+			if (dn == NULL) {
+				talloc_free(tmp_ctx);
+				return LDB_ERR_OPERATIONS_ERROR;
+			}
+
+			*out = data_blob_string_const(ldb_dn_alloc_casefold(mem_ctx, dn));
+			talloc_free(tmp_ctx);
+
+			if (!out->data) {
+				return LDB_ERR_OPERATIONS_ERROR;
+			}
+			return LDB_SUCCESS;
+		} else {
+			*out = data_blob_talloc(mem_ctx, in->data, in->length);
+			talloc_free(tmp_ctx);
+
+			if (in->data && !out->data) {
+				return LDB_ERR_OPERATIONS_ERROR;
+			}
+			return LDB_SUCCESS;
+		}
+	}
+	*out = data_blob_string_const(ldb_dn_alloc_casefold(mem_ctx, dn1));
+	talloc_free(tmp_ctx);
+
+	if (!out->data) {
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+	return LDB_SUCCESS;
+}
+
+static int ldif_comparison_objectCategory(struct ldb_context *ldb, void *mem_ctx,
+					  const struct ldb_val *v1,
+					  const struct ldb_val *v2)
+{
+	return ldb_any_comparison(ldb, mem_ctx, ldif_canonicalise_objectCategory,
+				  v1, v2);
+}
+
+/*
+  convert a NDR formatted blob to a ldif formatted schemaInfo
+*/
+static int ldif_write_schemaInfo(struct ldb_context *ldb, void *mem_ctx,
+				 const struct ldb_val *in, struct ldb_val *out)
+{
+	return ldif_write_NDR(ldb, mem_ctx, in, out,
+			      sizeof(struct repsFromToBlob),
+			      (ndr_pull_flags_fn_t)ndr_pull_schemaInfoBlob,
+			      (ndr_print_fn_t)ndr_print_schemaInfoBlob,
+			      true);
+}
+
+/*
+  convert a ldif formatted prefixMap to a NDR formatted blob
+*/
+static int ldif_read_prefixMap(struct ldb_context *ldb, void *mem_ctx,
+			       const struct ldb_val *in, struct ldb_val *out)
+{
+	struct prefixMapBlob *blob;
+	enum ndr_err_code ndr_err;
+	char *string, *line, *p, *oid;
+	DATA_BLOB oid_blob;
+
+	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+
+	if (tmp_ctx == NULL) {
+		return -1;
+	}
+
+	blob = talloc_zero(tmp_ctx, struct prefixMapBlob);
+	if (blob == NULL) {
+		talloc_free(tmp_ctx);
+		return -1;
+	}
+
+	/* use the switch value to detect if this is in the binary
+	 * format
+	 */
+	if (in->length >= 4 && IVAL(in->data, 0) == PREFIX_MAP_VERSION_DSDB) {
+		ndr_err = ndr_pull_struct_blob(in, tmp_ctx, blob,
+					       (ndr_pull_flags_fn_t)ndr_pull_prefixMapBlob);
+		if (NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+			ndr_err = ndr_push_struct_blob(out, mem_ctx,
+						       blob,
+						       (ndr_push_flags_fn_t)ndr_push_prefixMapBlob);
+			talloc_free(tmp_ctx);
+			if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+				return -1;
+			}
+			return 0;
+		}
+	}
+
+	/* If this does not parse, then it is probably the text version, and we should try it that way */
+	blob->version = PREFIX_MAP_VERSION_DSDB;
+
+	string = talloc_strndup(mem_ctx, (const char *)in->data, in->length);
+	if (string == NULL) {
+		talloc_free(blob);
+		return -1;
+	}
+
+	line = string;
+	while (line && line[0]) {
+		int error = 0;
+
+		p=strchr(line, ';');
+		if (p) {
+			p[0] = '\0';
+		} else {
+			p=strchr(line, '\n');
+			if (p) {
+				p[0] = '\0';
+			}
+		}
+		/* allow a trailing separator */
+		if (line == p) {
+			break;
+		}
+
+		blob->ctr.dsdb.mappings = talloc_realloc(blob,
+							 blob->ctr.dsdb.mappings,
+							 struct drsuapi_DsReplicaOIDMapping,
+							 blob->ctr.dsdb.num_mappings+1);
+		if (!blob->ctr.dsdb.mappings) {
+			talloc_free(tmp_ctx);
+			return -1;
+		}
+
+		blob->ctr.dsdb.mappings[blob->ctr.dsdb.num_mappings].id_prefix =
+			smb_strtoul(line, &oid, 10, &error, SMB_STR_STANDARD);
+
+		if (oid[0] != ':' || error != 0) {
+			talloc_free(tmp_ctx);
+			return -1;
+		}
+
+		/* we know there must be at least ":" */
+		oid++;
+
+		if (!ber_write_partial_OID_String(blob->ctr.dsdb.mappings, &oid_blob, oid)) {
+			talloc_free(tmp_ctx);
+			return -1;
+		}
+		blob->ctr.dsdb.mappings[blob->ctr.dsdb.num_mappings].oid.length = oid_blob.length;
+		blob->ctr.dsdb.mappings[blob->ctr.dsdb.num_mappings].oid.binary_oid = oid_blob.data;
+
+		blob->ctr.dsdb.num_mappings++;
+
+		/* Now look past the terminator we added above */
+		if (p) {
+			line = p + 1;
+		} else {
+			line = NULL;
+		}
+	}
+
+	ndr_err = ndr_push_struct_blob(out, mem_ctx,
+				       blob,
+				       (ndr_push_flags_fn_t)ndr_push_prefixMapBlob);
+	talloc_free(tmp_ctx);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		return -1;
+	}
+	return 0;
+}
+
+/*
+  convert a NDR formatted blob to a ldif formatted prefixMap
+*/
+static int ldif_write_prefixMap(struct ldb_context *ldb, void *mem_ctx,
+				const struct ldb_val *in, struct ldb_val *out)
+{
+	struct prefixMapBlob *blob;
+	enum ndr_err_code ndr_err;
+	char *string;
+	uint32_t i;
+
+	if (ldb_get_flags(ldb) & LDB_FLG_SHOW_BINARY) {
+		int err;
+		/* try to decode the blob as S4 prefixMap */
+		err = ldif_write_NDR(ldb, mem_ctx, in, out,
+		                     sizeof(struct prefixMapBlob),
+		                     (ndr_pull_flags_fn_t)ndr_pull_prefixMapBlob,
+		                     (ndr_print_fn_t)ndr_print_prefixMapBlob,
+		                     false);
+		if (0 == err) {
+			return err;
+		}
+		/* try parsing it as Windows PrefixMap value */
+		return ldif_write_NDR(ldb, mem_ctx, in, out,
+		                      sizeof(struct drsuapi_MSPrefixMap_Ctr),
+		                      (ndr_pull_flags_fn_t)ndr_pull_drsuapi_MSPrefixMap_Ctr,
+		                      (ndr_print_fn_t)ndr_print_drsuapi_MSPrefixMap_Ctr,
+		                      true);
+	}
+
+	blob = talloc(mem_ctx, struct prefixMapBlob);
+	if (blob == NULL) {
+		return -1;
+	}
+	ndr_err = ndr_pull_struct_blob_all(in, blob,
+					   blob,
+					   (ndr_pull_flags_fn_t)ndr_pull_prefixMapBlob);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		goto failed;
+	}
+	if (blob->version != PREFIX_MAP_VERSION_DSDB) {
+		goto failed;
+	}
+	string = talloc_strdup(mem_ctx, "");
+	if (string == NULL) {
+		goto failed;
+	}
+
+	for (i=0; i < blob->ctr.dsdb.num_mappings; i++) {
+		DATA_BLOB oid_blob;
+		char *partial_oid = NULL;
+
+		if (i > 0) {
+			talloc_asprintf_addbuf(&string, ";");
+		}
+
+		oid_blob = data_blob_const(blob->ctr.dsdb.mappings[i].oid.binary_oid,
+					   blob->ctr.dsdb.mappings[i].oid.length);
+		if (!ber_read_partial_OID_String(blob, oid_blob, &partial_oid)) {
+			DEBUG(0, ("ber_read_partial_OID failed on prefixMap item with id: 0x%X\n",
+				  blob->ctr.dsdb.mappings[i].id_prefix));
+			goto failed;
+		}
+		talloc_asprintf_addbuf(&string, "%u:%s",
+				       blob->ctr.dsdb.mappings[i].id_prefix,
+				       partial_oid);
+		talloc_free(discard_const(partial_oid));
+	}
+
+	talloc_free(blob);
+	*out = data_blob_string_const(string);
+	return 0;
+
+failed:
+	talloc_free(blob);
+	return -1;
+}
+
+static bool ldif_comparision_prefixMap_isString(const struct ldb_val *v)
+{
+	if (v->length < 4) {
+		return true;
+	}
+
+	if (IVAL(v->data, 0) == PREFIX_MAP_VERSION_DSDB) {
+		return false;
+	}
+
+	return true;
+}
+
+/*
+  canonicalise a prefixMap
+*/
+static int ldif_canonicalise_prefixMap(struct ldb_context *ldb, void *mem_ctx,
+				       const struct ldb_val *in, struct ldb_val *out)
+{
+	if (ldif_comparision_prefixMap_isString(in)) {
+		return ldif_read_prefixMap(ldb, mem_ctx, in, out);
+	}
+	return ldb_handler_copy(ldb, mem_ctx, in, out);
+}
+
+static int ldif_comparison_prefixMap(struct ldb_context *ldb, void *mem_ctx,
+				     const struct ldb_val *v1,
+				     const struct ldb_val *v2)
+{
+	return ldb_any_comparison(ldb, mem_ctx, ldif_canonicalise_prefixMap,
+				  v1, v2);
+}
+
+/* length limited conversion of a ldb_val to a int32_t */
+static int val_to_int32(const struct ldb_val *in, int32_t *v)
+{
+	char *end;
+	char buf[64];
+
+	/* make sure we don't read past the end of the data */
+	if (in->length > sizeof(buf)-1) {
+		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
+	}
+	strncpy(buf, (char *)in->data, in->length);
+	buf[in->length] = 0;
+
+	/* We've to use "strtoll" here to have the intended overflows.
+	 * Otherwise we may get "LONG_MAX" and the conversion is wrong. */
+	*v = (int32_t) strtoll(buf, &end, 0);
+	if (*end != 0) {
+		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
+	}
+	return LDB_SUCCESS;
+}
+
+/* length limited conversion of a ldb_val to a int64_t */
+static int val_to_int64(const struct ldb_val *in, int64_t *v)
+{
+	char *end;
+	char buf[64];
+
+	/* make sure we don't read past the end of the data */
+	if (in->length > sizeof(buf)-1) {
+		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
+	}
+	strncpy(buf, (char *)in->data, in->length);
+	buf[in->length] = 0;
+
+	*v = (int64_t) strtoll(buf, &end, 0);
+	if (*end != 0) {
+		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
+	}
+	return LDB_SUCCESS;
+}
+
+/* Canonicalisation of two 32-bit integers */
+static int ldif_canonicalise_int32(struct ldb_context *ldb, void *mem_ctx,
+			const struct ldb_val *in, struct ldb_val *out)
+{
+	int32_t i;
+	int ret;
+
+	ret = val_to_int32(in, &i);
+	if (ret != LDB_SUCCESS) {
+		return ret;
+	}
+	out->data = (uint8_t *) talloc_asprintf(mem_ctx, "%d", i);
+	if (out->data == NULL) {
+		ldb_oom(ldb);
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+	out->length = strlen((char *)out->data);
+	return 0;
+}
+
+/*
+ * Lexicographically sorted representation for a 32-bit integer
+ *
+ * [ INT32_MIN ... -3, -2, -1 | 0 | +1, +2, +3 ... INT32_MAX ]
+ *             n                o              p
+ *
+ * Refer to the comment in lib/ldb/common/attrib_handlers.c for the
+ * corresponding documentation for 64-bit integers.
+ *
+ * The same rules apply but use INT32_MIN and INT32_MAX.
+ *
+ * String representation padding is done to 10 characters.
+ *
+ * INT32_MAX = 2^31 - 1 = 2147483647 (10 characters long)
+ *
+ */
+static int ldif_index_format_int32(struct ldb_context *ldb,
+				    void *mem_ctx,
+				    const struct ldb_val *in,
+				    struct ldb_val *out)
+{
+	int32_t i;
+	int ret;
+	char prefix;
+	size_t len;
+
+	ret = val_to_int32(in, &i);
+	if (ret != LDB_SUCCESS) {
+		return ret;
+	}
+
+	if (i < 0) {
+		/*
+		 * i is negative, so this is subtraction rather than
+		 * wrap-around.
+		 */
+		prefix = 'n';
+		i = INT32_MAX + i + 1;
+	} else if (i > 0) {
+		prefix = 'p';
+	} else {
+		prefix = 'o';
+	}
+
+	out->data = (uint8_t *) talloc_asprintf(mem_ctx, "%c%010ld", prefix, (long)i);
+	if (out->data == NULL) {
+		ldb_oom(ldb);
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+
+	len = talloc_array_length(out->data) - 1;
+	if (len != 11) {
+		ldb_debug(ldb, LDB_DEBUG_ERROR,
+			  __location__ ": expected index format str %s to"
+			  " have length 11 but got %zu",
+			  (char*)out->data, len);
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+
+	out->length = 11;
+	return 0;
+}
+
+/* Comparison of two 32-bit integers */
+static int ldif_comparison_int32(struct ldb_context *ldb, void *mem_ctx,
+				 const struct ldb_val *v1, const struct ldb_val *v2)
+{
+	int32_t i1=0, i2=0;
+	val_to_int32(v1, &i1);
+	val_to_int32(v2, &i2);
+	if (i1 == i2) return 0;
+	return i1 > i2? 1 : -1;
+}
+
+/* Canonicalisation of two 64-bit integers */
+static int ldif_canonicalise_int64(struct ldb_context *ldb, void *mem_ctx,
+				   const struct ldb_val *in, struct ldb_val *out)
+{
+	int64_t i;
+	int ret;
+
+	ret = val_to_int64(in, &i);
+	if (ret != LDB_SUCCESS) {
+		return ret;
+	}
+	out->data = (uint8_t *) talloc_asprintf(mem_ctx, "%lld", (long long)i);
+	if (out->data == NULL) {
+		ldb_oom(ldb);
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+	out->length = strlen((char *)out->data);
+	return 0;
+}
+
+/* Comparison of two 64-bit integers */
+static int ldif_comparison_int64(struct ldb_context *ldb, void *mem_ctx,
+				 const struct ldb_val *v1, const struct ldb_val *v2)
+{
+	int64_t i1=0, i2=0;
+	val_to_int64(v1, &i1);
+	val_to_int64(v2, &i2);
+	if (i1 == i2) return 0;
+	return i1 > i2? 1 : -1;
+}
+
+/*
+  convert a NDR formatted blob to a ldif formatted repsFromTo
+*/
+static int ldif_write_repsFromTo(struct ldb_context *ldb, void *mem_ctx,
+				 const struct ldb_val *in, struct ldb_val *out)
+{
+	return ldif_write_NDR(ldb, mem_ctx, in, out,
+			      sizeof(struct repsFromToBlob),
+			      (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob,
+			      (ndr_print_fn_t)ndr_print_repsFromToBlob,
+			      true);
+}
+
+/*
+  convert a NDR formatted blob to a ldif formatted replPropertyMetaData
+*/
+static int ldif_write_replPropertyMetaData(struct ldb_context *ldb, void *mem_ctx,
+					   const struct ldb_val *in, struct ldb_val *out)
+{
+	return ldif_write_NDR(ldb, mem_ctx, in, out,
+			      sizeof(struct replPropertyMetaDataBlob),
+			      (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob,
+			      (ndr_print_fn_t)ndr_print_replPropertyMetaDataBlob,
+			      true);
+}
+
+/*
+  convert a NDR formatted blob to a ldif formatted replUpToDateVector
+*/
+static int ldif_write_replUpToDateVector(struct ldb_context *ldb, void *mem_ctx,
+					 const struct ldb_val *in, struct ldb_val *out)
+{
+	return ldif_write_NDR(ldb, mem_ctx, in, out,
+			      sizeof(struct replUpToDateVectorBlob),
+			      (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob,
+			      (ndr_print_fn_t)ndr_print_replUpToDateVectorBlob,
+			      true);
+}
+
+static int ldif_write_dn_binary_NDR(struct ldb_context *ldb, void *mem_ctx,
+				    const struct ldb_val *in, struct ldb_val *out,
+				    size_t struct_size,
+				    ndr_pull_flags_fn_t pull_fn,
+				    ndr_print_fn_t print_fn,
+				    bool mask_errors)
+{
+	uint8_t *p = NULL;
+	enum ndr_err_code err;
+	struct dsdb_dn *dsdb_dn = NULL;
+	char *dn_str = NULL;
+	char *str = NULL;
+
+	if (!(ldb_get_flags(ldb) & LDB_FLG_SHOW_BINARY)) {
+		return ldb_handler_copy(ldb, mem_ctx, in, out);
+	}
+
+	dsdb_dn = dsdb_dn_parse(mem_ctx, ldb, in, DSDB_SYNTAX_BINARY_DN);
+	if (dsdb_dn == NULL) {
+		return ldb_handler_copy(ldb, mem_ctx, in, out);
+	}
+
+	p = talloc_size(dsdb_dn, struct_size);
+	if (p == NULL) {
+		TALLOC_FREE(dsdb_dn);
+		return ldb_handler_copy(ldb, mem_ctx, in, out);
+	}
+
+	err = ndr_pull_struct_blob(&dsdb_dn->extra_part, p, p, pull_fn);
+	if (err != NDR_ERR_SUCCESS) {
+		/* fail in not in mask_error mode */
+		if (!mask_errors) {
+			return -1;
+		}
+		TALLOC_FREE(dsdb_dn);
+		return ldb_handler_copy(ldb, mem_ctx, in, out);
+	}
+
+	dn_str = ldb_dn_get_extended_linearized(dsdb_dn, dsdb_dn->dn, 1);
+	if (dn_str == NULL) {
+		TALLOC_FREE(dsdb_dn);
+		return ldb_handler_copy(ldb, mem_ctx, in, out);
+	}
+
+	str = ndr_print_struct_string(mem_ctx, print_fn, dn_str, p);
+	TALLOC_FREE(dsdb_dn);
+	if (str == NULL) {
+		return ldb_handler_copy(ldb, mem_ctx, in, out);
+	}
+
+	*out = data_blob_string_const(str);
+	return 0;
+}
+
+static int ldif_write_msDS_RevealedUsers(struct ldb_context *ldb, void *mem_ctx,
+					 const struct ldb_val *in, struct ldb_val *out)
+{
+	return ldif_write_dn_binary_NDR(ldb, mem_ctx, in, out,
+			      sizeof(struct replPropertyMetaData1),
+			      (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaData1,
+			      (ndr_print_fn_t)ndr_print_replPropertyMetaData1,
+			      true);
+}
+
+/*
+  convert a NDR formatted blob to a ldif formatted dnsRecord
+*/
+static int ldif_write_dnsRecord(struct ldb_context *ldb, void *mem_ctx,
+				const struct ldb_val *in, struct ldb_val *out)
+{
+	return ldif_write_NDR(ldb, mem_ctx, in, out,
+			      sizeof(struct dnsp_DnssrvRpcRecord),
+			      (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord,
+			      (ndr_print_fn_t)ndr_print_dnsp_DnssrvRpcRecord,
+			      true);
+}
+
+/*
+  convert a NDR formatted blob to a ldif formatted dnsProperty
+*/
+static int ldif_write_dnsProperty(struct ldb_context *ldb, void *mem_ctx,
+				const struct ldb_val *in, struct ldb_val *out)
+{
+	return ldif_write_NDR(ldb, mem_ctx, in, out,
+			      sizeof(struct dnsp_DnsProperty),
+			      (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnsProperty,
+			      (ndr_print_fn_t)ndr_print_dnsp_DnsProperty,
+			      true);
+}
+
+/*
+  convert a NDR formatted blob of a supplementalCredentials into text
+*/
+static int ldif_write_supplementalCredentialsBlob(struct ldb_context *ldb, void *mem_ctx,
+						  const struct ldb_val *in, struct ldb_val *out)
+{
+	return ldif_write_NDR(ldb, mem_ctx, in, out,
+			      sizeof(struct supplementalCredentialsBlob),
+			      (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob,
+			      (ndr_print_fn_t)ndr_print_supplementalCredentialsBlob,
+			      true);
+}
+
+/*
+  convert a NDR formatted blob to a ldif formatted trustAuthInOutBlob
+*/
+static int ldif_write_trustAuthInOutBlob(struct ldb_context *ldb, void *mem_ctx,
+					   const struct ldb_val *in, struct ldb_val *out)
+{
+	return ldif_write_NDR(ldb, mem_ctx, in, out,
+			      sizeof(struct trustAuthInOutBlob),
+			      (ndr_pull_flags_fn_t)ndr_pull_trustAuthInOutBlob,
+			      (ndr_print_fn_t)ndr_print_trustAuthInOutBlob,
+			      true);
+}
+
+/*
+  convert a NDR formatted blob to a ldif formatted msDS-TrustForestTrustInfo
+*/
+static int ldif_write_ForestTrustInfo(struct ldb_context *ldb, void *mem_ctx,
+				      const struct ldb_val *in, struct ldb_val *out)
+{
+	return ldif_write_NDR(ldb, mem_ctx, in, out,
+			      sizeof(struct ForestTrustInfo),
+			      (ndr_pull_flags_fn_t)ndr_pull_ForestTrustInfo,
+			      (ndr_print_fn_t)ndr_print_ForestTrustInfo,
+			      true);
+}
+/*
+  convert a NDR formatted blob of a partialAttributeSet into text
+*/
+static int ldif_write_partialAttributeSet(struct ldb_context *ldb, void *mem_ctx,
+					  const struct ldb_val *in, struct ldb_val *out)
+{
+	return ldif_write_NDR(ldb, mem_ctx, in, out,
+			      sizeof(struct partialAttributeSetBlob),
+			      (ndr_pull_flags_fn_t)ndr_pull_partialAttributeSetBlob,
+			      (ndr_print_fn_t)ndr_print_partialAttributeSetBlob,
+			      true);
+}
+
+
+static int extended_dn_write_hex(struct ldb_context *ldb, void *mem_ctx,
+				 const struct ldb_val *in, struct ldb_val *out)
+{
+	*out = data_blob_string_const(data_blob_hex_string_lower(mem_ctx, in));
+	if (!out->data) {
+		return -1;
+	}
+	return 0;
+}
+
+/*
+  compare two dns
+*/
+static int samba_ldb_dn_link_comparison(struct ldb_context *ldb, void *mem_ctx,
+					const struct ldb_val *v1, const struct ldb_val *v2)
+{
+	struct ldb_dn *dn1 = NULL, *dn2 = NULL;
+	int ret;
+
+	if (dsdb_dn_is_deleted_val(v1)) {
+		/* If the DN is deleted, then we can't search for it */
+		return -1;
+	}
+
+	if (dsdb_dn_is_deleted_val(v2)) {
+		/* If the DN is deleted, then we can't search for it */
+		return -1;
+	}
+
+	dn1 = ldb_dn_from_ldb_val(mem_ctx, ldb, v1);
+	if ( ! ldb_dn_validate(dn1)) return -1;
+
+	dn2 = ldb_dn_from_ldb_val(mem_ctx, ldb, v2);
+	if ( ! ldb_dn_validate(dn2)) {
+		talloc_free(dn1);
+		return -1;
+	}
+
+	ret = ldb_dn_compare(dn1, dn2);
+
+	talloc_free(dn1);
+	talloc_free(dn2);
+	return ret;
+}
+
+static int samba_ldb_dn_link_canonicalise(struct ldb_context *ldb, void *mem_ctx,
+					  const struct ldb_val *in, struct ldb_val *out)
+{
+	struct ldb_dn *dn;
+	int ret = -1;
+
+	out->length = 0;
+	out->data = NULL;
+
+	dn = ldb_dn_from_ldb_val(mem_ctx, ldb, in);
+	if ( ! ldb_dn_validate(dn)) {
+		return LDB_ERR_INVALID_DN_SYNTAX;
+	}
+
+	/* By including the RMD_FLAGS of a deleted DN, we ensure it
+	 * does not casually match a not deleted DN */
+	if (dsdb_dn_is_deleted_val(in)) {
+		out->data = (uint8_t *)talloc_asprintf(mem_ctx,
+						       "<RMD_FLAGS=%u>%s",
+						       dsdb_dn_val_rmd_flags(in),
+						       ldb_dn_get_casefold(dn));
+	} else {
+		out->data = (uint8_t *)ldb_dn_alloc_casefold(mem_ctx, dn);
+	}
+
+	if (out->data == NULL) {
+		goto done;
+	}
+	out->length = strlen((char *)out->data);
+
+	ret = 0;
+
+done:
+	talloc_free(dn);
+
+	return ret;
+}
+
+
+/*
+  write a 64 bit 2-part range
+*/
+static int ldif_write_range64(struct ldb_context *ldb, void *mem_ctx,
+			      const struct ldb_val *in, struct ldb_val *out)
+{
+	int64_t v;
+	int ret;
+	ret = val_to_int64(in, &v);
+	if (ret != LDB_SUCCESS) {
+		return ret;
+	}
+	out->data = (uint8_t *)talloc_asprintf(mem_ctx, "%lu-%lu",
+					       (unsigned long)(v&0xFFFFFFFF),
+					       (unsigned long)(v>>32));
+	if (out->data == NULL) {
+		ldb_oom(ldb);
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+	out->length = strlen((char *)out->data);
+	return LDB_SUCCESS;
+}
+
+/*
+  read a 64 bit 2-part range
+*/
+static int ldif_read_range64(struct ldb_context *ldb, void *mem_ctx,
+			      const struct ldb_val *in, struct ldb_val *out)
+{
+	unsigned long high, low;
+	char buf[64];
+
+	if (memchr(in->data, '-', in->length) == NULL) {
+		return ldb_handler_copy(ldb, mem_ctx, in, out);
+	}
+
+	if (in->length > sizeof(buf)-1) {
+		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
+	}
+	strncpy(buf, (const char *)in->data, in->length);
+	buf[in->length] = 0;
+
+	if (sscanf(buf, "%lu-%lu", &low, &high) != 2) {
+		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
+	}
+
+	out->data = (uint8_t *)talloc_asprintf(mem_ctx, "%llu",
+					       (unsigned long long)(((uint64_t)high)<<32) | (low));
+
+	if (out->data == NULL) {
+		ldb_oom(ldb);
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+	out->length = strlen((char *)out->data);
+	return LDB_SUCCESS;
+}
+
+/*
+  when this operator_fn is set for a syntax, the backend calls is in
+  preference to the comparison function. We are told the exact
+  comparison operation that is needed, and we can return errors
+ */
+static int samba_syntax_operator_fn(struct ldb_context *ldb, enum ldb_parse_op operation,
+				    const struct ldb_schema_attribute *a,
+				    const struct ldb_val *v1, const struct ldb_val *v2, bool *matched)
+{
+	switch (operation) {
+	case LDB_OP_AND:
+	case LDB_OP_OR:
+	case LDB_OP_NOT:
+	case LDB_OP_SUBSTRING:
+	case LDB_OP_APPROX:
+	case LDB_OP_EXTENDED:
+		/* handled in the backends */
+		return LDB_ERR_INAPPROPRIATE_MATCHING;
+
+	case LDB_OP_GREATER:
+	case LDB_OP_LESS:
+	case LDB_OP_EQUALITY:
+	{
+		TALLOC_CTX *tmp_ctx = talloc_new(ldb);
+		int ret;
+		if (tmp_ctx == NULL) {
+			return ldb_oom(ldb);
+		}
+		ret = a->syntax->comparison_fn(ldb, tmp_ctx, v1, v2);
+		talloc_free(tmp_ctx);
+		if (operation == LDB_OP_GREATER) {
+			*matched = (ret >= 0);
+		} else if (operation == LDB_OP_LESS) {
+			*matched = (ret <= 0);
+		} else {
+			*matched = (ret == 0);
+		}
+		return LDB_SUCCESS;
+	}
+
+	case LDB_OP_PRESENT:
+		*matched = true;
+		return LDB_SUCCESS;
+	}
+
+	/* we shouldn't get here */
+	return LDB_ERR_INAPPROPRIATE_MATCHING;
+}
+
+/*
+  compare two binary objects.  This is correct for sorting as the sort order is:
+
+  a
+  aa
+  b
+  bb
+
+  rather than ldb_comparison_binary() which is:
+
+  a
+  b
+  aa
+  bb
+
+*/
+static int samba_ldb_comparison_binary(struct ldb_context *ldb, void *mem_ctx,
+				       const struct ldb_val *v1, const struct ldb_val *v2)
+{
+	return data_blob_cmp(v1, v2);
+}
+
+/*
+  when this operator_fn is set for a syntax, the backend calls is in
+  preference to the comparison function. We are told the exact
+  comparison operation that is needed, and we can return errors.
+
+  This mode optimises for ldb_comparison_binary() if we need equality,
+  as this should be faster as it can do a length-check first.
+ */
+static int samba_syntax_binary_operator_fn(struct ldb_context *ldb, enum ldb_parse_op operation,
+					   const struct ldb_schema_attribute *a,
+					   const struct ldb_val *v1, const struct ldb_val *v2, bool *matched)
+{
+	if (operation == LDB_OP_EQUALITY) {
+		*matched = (ldb_comparison_binary(ldb, NULL, v1, v2) == 0);
+		return LDB_SUCCESS;
+	}
+	return samba_syntax_operator_fn(ldb, operation, a, v1, v2, matched);
+}
+
+/*
+  see if two DNs match, comparing first by GUID, then by SID, and
+  finally by string components
+ */
+static int samba_dn_extended_match(struct ldb_context *ldb,
+				   const struct ldb_val *v1,
+				   const struct ldb_val *v2,
+				   bool *matched)
+{
+	TALLOC_CTX *tmp_ctx;
+	struct ldb_dn *dn1, *dn2;
+	const struct ldb_val *guid1, *guid2, *sid1, *sid2;
+	uint32_t rmd_flags1, rmd_flags2;
+
+	tmp_ctx = talloc_new(ldb);
+
+	dn1 = ldb_dn_from_ldb_val(tmp_ctx, ldb, v1);
+	dn2 = ldb_dn_from_ldb_val(tmp_ctx, ldb, v2);
+	if (!dn1 || !dn2) {
+		/* couldn't parse as DN's */
+		talloc_free(tmp_ctx);
+		(*matched) = false;
+		return LDB_SUCCESS;
+	}
+
+	rmd_flags1 = dsdb_dn_rmd_flags(dn1);
+	rmd_flags2 = dsdb_dn_rmd_flags(dn2);
+
+	if ((rmd_flags1 & DSDB_RMD_FLAG_DELETED) !=
+	    (rmd_flags2 & DSDB_RMD_FLAG_DELETED)) {
+		/* only match if they have the same deletion status */
+		talloc_free(tmp_ctx);
+		(*matched) = false;
+		return LDB_SUCCESS;
+	}
+
+
+	guid1 = ldb_dn_get_extended_component(dn1, "GUID");
+	guid2 = ldb_dn_get_extended_component(dn2, "GUID");
+	if (guid1 && guid2) {
+		(*matched) = (data_blob_cmp(guid1, guid2) == 0);
+		talloc_free(tmp_ctx);
+		return LDB_SUCCESS;
+	}
+
+	sid1 = ldb_dn_get_extended_component(dn1, "SID");
+	sid2 = ldb_dn_get_extended_component(dn2, "SID");
+	if (sid1 && sid2) {
+		(*matched) = (data_blob_cmp(sid1, sid2) == 0);
+		talloc_free(tmp_ctx);
+		return LDB_SUCCESS;
+	}
+
+	(*matched) = (ldb_dn_compare(dn1, dn2) == 0);
+
+	talloc_free(tmp_ctx);
+	return LDB_SUCCESS;
+}
+
+/*
+  special operation for DNs, to take account of the RMD_FLAGS deleted bit
+ */
+static int samba_syntax_operator_dn(struct ldb_context *ldb, enum ldb_parse_op operation,
+				    const struct ldb_schema_attribute *a,
+				    const struct ldb_val *v1, const struct ldb_val *v2, bool *matched)
+{
+	if (operation == LDB_OP_PRESENT && dsdb_dn_is_deleted_val(v1)) {
+		/* If the DN is deleted, then we can't search for it */
+
+		/* should this be for equality too? */
+		*matched = false;
+		return LDB_SUCCESS;
+	}
+
+	if (operation == LDB_OP_EQUALITY &&
+	    samba_dn_extended_match(ldb, v1, v2, matched) == LDB_SUCCESS) {
+		return LDB_SUCCESS;
+	}
+
+	return samba_syntax_operator_fn(ldb, operation, a, v1, v2, matched);
+}
+
+
+static const struct ldb_schema_syntax samba_syntaxes[] = {
+	{
+		.name		  = LDB_SYNTAX_SAMBA_SID,
+		.ldif_read_fn	  = ldif_read_objectSid,
+		.ldif_write_fn	  = ldif_write_objectSid,
+		.canonicalise_fn  = ldif_canonicalise_objectSid,
+		.comparison_fn	  = ldif_comparison_objectSid,
+		.operator_fn      = samba_syntax_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_SECURITY_DESCRIPTOR,
+		.ldif_read_fn	  = ldif_read_ntSecurityDescriptor,
+		.ldif_write_fn	  = ldif_write_ntSecurityDescriptor,
+		.canonicalise_fn  = ldb_handler_copy,
+		.comparison_fn	  = samba_ldb_comparison_binary,
+		.operator_fn      = samba_syntax_binary_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_SDDL_SECURITY_DESCRIPTOR,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldif_write_sddlSecurityDescriptor,
+		.canonicalise_fn  = ldb_handler_fold,
+		.comparison_fn	  = ldb_comparison_fold,
+		.operator_fn      = samba_syntax_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_GUID,
+		.ldif_read_fn	  = ldif_read_objectGUID,
+		.ldif_write_fn	  = ldif_write_objectGUID,
+		.canonicalise_fn  = ldif_canonicalise_objectGUID,
+		.comparison_fn	  = ldif_comparison_objectGUID,
+		.operator_fn      = samba_syntax_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_OBJECT_CATEGORY,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldb_handler_copy,
+		.canonicalise_fn  = ldif_canonicalise_objectCategory,
+		.comparison_fn	  = ldif_comparison_objectCategory,
+		.operator_fn      = samba_syntax_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_SCHEMAINFO,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldif_write_schemaInfo,
+		.canonicalise_fn  = ldb_handler_copy,
+		.comparison_fn	  = samba_ldb_comparison_binary,
+		.operator_fn      = samba_syntax_binary_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_PREFIX_MAP,
+		.ldif_read_fn	  = ldif_read_prefixMap,
+		.ldif_write_fn	  = ldif_write_prefixMap,
+		.canonicalise_fn  = ldif_canonicalise_prefixMap,
+		.comparison_fn	  = ldif_comparison_prefixMap,
+		.operator_fn      = samba_syntax_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_INT32,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldb_handler_copy,
+		.canonicalise_fn  = ldif_canonicalise_int32,
+		.index_format_fn  = ldif_index_format_int32,
+		.comparison_fn	  = ldif_comparison_int32,
+		.operator_fn      = samba_syntax_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_REPSFROMTO,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldif_write_repsFromTo,
+		.canonicalise_fn  = ldb_handler_copy,
+		.comparison_fn	  = samba_ldb_comparison_binary,
+		.operator_fn      = samba_syntax_binary_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_REPLPROPERTYMETADATA,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldif_write_replPropertyMetaData,
+		.canonicalise_fn  = ldb_handler_copy,
+		.comparison_fn	  = samba_ldb_comparison_binary,
+		.operator_fn      = samba_syntax_binary_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_REPLUPTODATEVECTOR,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldif_write_replUpToDateVector,
+		.canonicalise_fn  = ldb_handler_copy,
+		.comparison_fn	  = samba_ldb_comparison_binary,
+		.operator_fn      = samba_syntax_binary_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_REVEALEDUSERS,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldif_write_msDS_RevealedUsers,
+		.canonicalise_fn  = dsdb_dn_binary_canonicalise,
+		.comparison_fn	  = dsdb_dn_binary_comparison,
+		.operator_fn      = samba_syntax_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_TRUSTAUTHINOUTBLOB,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldif_write_trustAuthInOutBlob,
+		.canonicalise_fn  = ldb_handler_copy,
+		.comparison_fn	  = samba_ldb_comparison_binary,
+		.operator_fn      = samba_syntax_binary_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_FORESTTRUSTINFO,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldif_write_ForestTrustInfo,
+		.canonicalise_fn  = ldb_handler_copy,
+		.comparison_fn	  = samba_ldb_comparison_binary,
+		.operator_fn      = samba_syntax_binary_operator_fn
+	},{
+		.name		  = DSDB_SYNTAX_BINARY_DN,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldb_handler_copy,
+		.canonicalise_fn  = dsdb_dn_binary_canonicalise,
+		.comparison_fn	  = dsdb_dn_binary_comparison,
+		.operator_fn      = samba_syntax_operator_fn
+	},{
+		.name		  = DSDB_SYNTAX_STRING_DN,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldb_handler_copy,
+		.canonicalise_fn  = dsdb_dn_string_canonicalise,
+		.comparison_fn	  = dsdb_dn_string_comparison,
+		.operator_fn      = samba_syntax_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_DN,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldb_handler_copy,
+		.canonicalise_fn  = samba_ldb_dn_link_canonicalise,
+		.comparison_fn	  = samba_ldb_dn_link_comparison,
+		.operator_fn      = samba_syntax_operator_dn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_RANGE64,
+		.ldif_read_fn	  = ldif_read_range64,
+		.ldif_write_fn	  = ldif_write_range64,
+		.canonicalise_fn  = ldif_canonicalise_int64,
+		.comparison_fn	  = ldif_comparison_int64,
+		.operator_fn      = samba_syntax_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_DNSRECORD,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldif_write_dnsRecord,
+		.canonicalise_fn  = ldb_handler_copy,
+		.comparison_fn	  = samba_ldb_comparison_binary,
+		.operator_fn      = samba_syntax_binary_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_DNSPROPERTY,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldif_write_dnsProperty,
+		.canonicalise_fn  = ldb_handler_copy,
+		.comparison_fn	  = samba_ldb_comparison_binary,
+		.operator_fn      = samba_syntax_binary_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_SUPPLEMENTALCREDENTIALS,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldif_write_supplementalCredentialsBlob,
+		.canonicalise_fn  = ldb_handler_copy,
+		.comparison_fn	  = samba_ldb_comparison_binary,
+		.operator_fn      = samba_syntax_binary_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_PARTIALATTRIBUTESET,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldif_write_partialAttributeSet,
+		.canonicalise_fn  = ldb_handler_copy,
+		.comparison_fn	  = samba_ldb_comparison_binary,
+		.operator_fn      = samba_syntax_binary_operator_fn
+	},{
+		.name		  = LDB_SYNTAX_SAMBA_OCTET_STRING,
+		.ldif_read_fn	  = ldb_handler_copy,
+		.ldif_write_fn	  = ldb_handler_copy,
+		.canonicalise_fn  = ldb_handler_copy,
+		.comparison_fn	  = samba_ldb_comparison_binary,
+		.operator_fn      = samba_syntax_binary_operator_fn
+	}
+};
+
+static const struct ldb_dn_extended_syntax samba_dn_syntax[] = {
+	{
+		.name		  = "SID",
+		.read_fn          = extended_dn_read_SID,
+		.write_clear_fn   = ldif_write_objectSid,
+		.write_hex_fn     = extended_dn_write_hex
+	},{
+		.name		  = "GUID",
+		.read_fn          = extended_dn_read_GUID,
+		.write_clear_fn   = ldif_write_objectGUID,
+		.write_hex_fn     = extended_dn_write_hex
+	},{
+		.name		  = "WKGUID",
+		.read_fn          = ldb_handler_copy,
+		.write_clear_fn   = ldb_handler_copy,
+		.write_hex_fn     = ldb_handler_copy
+	},{
+		.name		  = "RMD_INVOCID",
+		.read_fn          = extended_dn_read_GUID,
+		.write_clear_fn   = ldif_write_objectGUID,
+		.write_hex_fn     = extended_dn_write_hex
+	},{
+		.name		  = "RMD_FLAGS",
+		.read_fn          = ldb_handler_copy,
+		.write_clear_fn   = ldb_handler_copy,
+		.write_hex_fn     = ldb_handler_copy
+	},{
+		.name		  = "RMD_ADDTIME",
+		.read_fn          = ldb_handler_copy,
+		.write_clear_fn   = ldb_handler_copy,
+		.write_hex_fn     = ldb_handler_copy
+	},{
+		.name		  = "RMD_CHANGETIME",
+		.read_fn          = ldb_handler_copy,
+		.write_clear_fn   = ldb_handler_copy,
+		.write_hex_fn     = ldb_handler_copy
+	},{
+		.name		  = "RMD_LOCAL_USN",
+		.read_fn          = ldb_handler_copy,
+		.write_clear_fn   = ldb_handler_copy,
+		.write_hex_fn     = ldb_handler_copy
+	},{
+		.name		  = "RMD_ORIGINATING_USN",
+		.read_fn          = ldb_handler_copy,
+		.write_clear_fn   = ldb_handler_copy,
+		.write_hex_fn     = ldb_handler_copy
+	},{
+		.name		  = "RMD_VERSION",
+		.read_fn          = ldb_handler_copy,
+		.write_clear_fn   = ldb_handler_copy,
+		.write_hex_fn     = ldb_handler_copy
+	}
+};
+
+/* TODO: Should be dynamic at some point */
+static const struct {
+	const char *name;
+	const char *syntax;
+} samba_attributes[] = {
+	{ "ntSecurityDescriptor",	LDB_SYNTAX_SAMBA_SECURITY_DESCRIPTOR },
+	{ "oMSyntax",			LDB_SYNTAX_SAMBA_INT32 },
+	{ "objectCategory",		LDB_SYNTAX_SAMBA_OBJECT_CATEGORY },
+	{ "schemaInfo",			LDB_SYNTAX_SAMBA_SCHEMAINFO },
+	{ "prefixMap",                  LDB_SYNTAX_SAMBA_PREFIX_MAP },
+	{ "repsFrom",                   LDB_SYNTAX_SAMBA_REPSFROMTO },
+	{ "repsTo",                     LDB_SYNTAX_SAMBA_REPSFROMTO },
+	{ "replPropertyMetaData",       LDB_SYNTAX_SAMBA_REPLPROPERTYMETADATA },
+	{ "replUpToDateVector",         LDB_SYNTAX_SAMBA_REPLUPTODATEVECTOR },
+	{ "msDS-RevealedUsers",         LDB_SYNTAX_SAMBA_REVEALEDUSERS },
+	{ "trustAuthIncoming",          LDB_SYNTAX_SAMBA_TRUSTAUTHINOUTBLOB },
+	{ "trustAuthOutgoing",          LDB_SYNTAX_SAMBA_TRUSTAUTHINOUTBLOB },
+	{ "msDS-TrustForestTrustInfo",  LDB_SYNTAX_SAMBA_FORESTTRUSTINFO },
+	{ "rIDAllocationPool",		LDB_SYNTAX_SAMBA_RANGE64 },
+	{ "rIDPreviousAllocationPool",	LDB_SYNTAX_SAMBA_RANGE64 },
+	{ "rIDAvailablePool",		LDB_SYNTAX_SAMBA_RANGE64 },
+	{ "defaultSecurityDescriptor",	LDB_SYNTAX_SAMBA_SDDL_SECURITY_DESCRIPTOR },
+
+	/*
+	 * these are extracted by searching
+	 * (&(attributeSyntax=2.5.5.17)(omSyntax=4))
+	 *
+	 * Except: msAuthz-CentralAccessPolicyID as it might be a GUID see:
+	 * adminDescription: For a Central Access Policy, this attribute defines a GUID t
+	 * hat can be used to identify the set of policies when applied to a resource.
+	 * Until we see a msAuthz-CentralAccessPolicyID value on a windows
+	 * server, we ignore it here.
+	 */
+	{ "mS-DS-CreatorSID",		LDB_SYNTAX_SAMBA_SID },
+	{ "msDS-QuotaTrustee",		LDB_SYNTAX_SAMBA_SID },
+	{ "objectSid",			LDB_SYNTAX_SAMBA_SID },
+	{ "tokenGroups", 	        LDB_SYNTAX_SAMBA_SID },
+	{ "tokenGroupsGlobalAndUniversal", LDB_SYNTAX_SAMBA_SID },
+	{ "tokenGroupsNoGCAcceptable",  LDB_SYNTAX_SAMBA_SID },
+	{ "securityIdentifier", 	LDB_SYNTAX_SAMBA_SID },
+	{ "sIDHistory",			LDB_SYNTAX_SAMBA_SID },
+	{ "syncWithSID",		LDB_SYNTAX_SAMBA_SID },
+
+	/*
+	 * these are extracted by searching
+	 * (&(attributeSyntax=2.5.5.10)(rangeLower=16)(rangeUpper=16)(omSyntax=4))
+	 */
+	{ "attributeSecurityGUID",		LDB_SYNTAX_SAMBA_GUID },
+	{ "categoryId",				LDB_SYNTAX_SAMBA_GUID },
+	{ "controlAccessRights",		LDB_SYNTAX_SAMBA_GUID },
+	{ "currMachineId",			LDB_SYNTAX_SAMBA_GUID },
+	{ "fRSReplicaSetGUID",			LDB_SYNTAX_SAMBA_GUID },
+	{ "fRSVersionGUID",			LDB_SYNTAX_SAMBA_GUID },
+	{ "implementedCategories",		LDB_SYNTAX_SAMBA_GUID },
+	{ "msDS-AzObjectGuid",			LDB_SYNTAX_SAMBA_GUID },
+	{ "msDS-GenerationId",			LDB_SYNTAX_SAMBA_GUID },
+	{ "msDS-OptionalFeatureGUID",		LDB_SYNTAX_SAMBA_GUID },
+	{ "msDFSR-ContentSetGuid",		LDB_SYNTAX_SAMBA_GUID },
+	{ "msDFSR-ReplicationGroupGuid",	LDB_SYNTAX_SAMBA_GUID },
+	{ "mSMQDigests",			LDB_SYNTAX_SAMBA_GUID },
+	{ "mSMQOwnerID",			LDB_SYNTAX_SAMBA_GUID },
+	{ "mSMQQMID",				LDB_SYNTAX_SAMBA_GUID },
+	{ "mSMQQueueType",			LDB_SYNTAX_SAMBA_GUID },
+	{ "mSMQSites",				LDB_SYNTAX_SAMBA_GUID },
+	{ "netbootGUID",			LDB_SYNTAX_SAMBA_GUID },
+	{ "objectGUID",				LDB_SYNTAX_SAMBA_GUID },
+	{ "pKTGuid",				LDB_SYNTAX_SAMBA_GUID },
+	{ "requiredCategories",			LDB_SYNTAX_SAMBA_GUID },
+	{ "schemaIDGUID",			LDB_SYNTAX_SAMBA_GUID },
+	{ "siteGUID",				LDB_SYNTAX_SAMBA_GUID },
+	{ "msDFS-GenerationGUIDv2",		LDB_SYNTAX_SAMBA_GUID },
+	{ "msDFS-LinkIdentityGUIDv2",		LDB_SYNTAX_SAMBA_GUID },
+	{ "msDFS-NamespaceIdentityGUIDv2",	LDB_SYNTAX_SAMBA_GUID },
+	{ "msSPP-CSVLKSkuId",			LDB_SYNTAX_SAMBA_GUID },
+	{ "msSPP-KMSIds",			LDB_SYNTAX_SAMBA_GUID },
+
+	/*
+	 * these are known to be GUIDs
+	 */
+	{ "invocationId",			LDB_SYNTAX_SAMBA_GUID },
+	{ "parentGUID",				LDB_SYNTAX_SAMBA_GUID },
+
+	/* These NDR encoded things we want to be able to read with --show-binary */
+	{ "dnsRecord",				LDB_SYNTAX_SAMBA_DNSRECORD },
+	{ "dNSProperty",			LDB_SYNTAX_SAMBA_DNSPROPERTY },
+	{ "supplementalCredentials",		LDB_SYNTAX_SAMBA_SUPPLEMENTALCREDENTIALS},
+	{ "partialAttributeSet",		LDB_SYNTAX_SAMBA_PARTIALATTRIBUTESET}
+};
+
+const struct ldb_schema_syntax *ldb_samba_syntax_by_name(struct ldb_context *ldb, const char *name)
+{
+	unsigned int j;
+	const struct ldb_schema_syntax *s = NULL;
+
+	for (j=0; j < ARRAY_SIZE(samba_syntaxes); j++) {
+		if (strcmp(name, samba_syntaxes[j].name) == 0) {
+			s = &samba_syntaxes[j];
+			break;
+		}
+	}
+	return s;
+}
+
+const struct ldb_schema_syntax *ldb_samba_syntax_by_lDAPDisplayName(struct ldb_context *ldb, const char *name)
+{
+	unsigned int j;
+	const struct ldb_schema_syntax *s = NULL;
+
+	for (j=0; j < ARRAY_SIZE(samba_attributes); j++) {
+		if (strcmp(samba_attributes[j].name, name) == 0) {
+			s = ldb_samba_syntax_by_name(ldb, samba_attributes[j].syntax);
+			break;
+		}
+	}
+
+	return s;
+}
+
+static const char *secret_attributes[] = {DSDB_SECRET_ATTRIBUTES, "secret",
+                                          "priorSecret", NULL};
+
+/*
+  register the samba ldif handlers
+*/
+int ldb_register_samba_handlers(struct ldb_context *ldb)
+{
+	unsigned int i;
+	int ret;
+
+	if (ldb_get_opaque(ldb, "SAMBA_HANDLERS_REGISTERED") != NULL) {
+		return LDB_SUCCESS;
+	}
+
+	ret = ldb_set_opaque(ldb, LDB_SECRET_ATTRIBUTE_LIST_OPAQUE, discard_const_p(char *, secret_attributes));
+	if (ret != LDB_SUCCESS) {
+		return ret;
+	}
+
+	for (i=0; i < ARRAY_SIZE(samba_attributes); i++) {
+		const struct ldb_schema_syntax *s = NULL;
+
+		s = ldb_samba_syntax_by_name(ldb, samba_attributes[i].syntax);
+
+		if (!s) {
+			s = ldb_standard_syntax_by_name(ldb, samba_attributes[i].syntax);
+		}
+
+		if (!s) {
+			return LDB_ERR_OPERATIONS_ERROR;
+		}
+
+		ret = ldb_schema_attribute_add_with_syntax(ldb, samba_attributes[i].name, LDB_ATTR_FLAG_FIXED, s);
+		if (ret != LDB_SUCCESS) {
+			return ret;
+		}
+	}
+
+	for (i=0; i < ARRAY_SIZE(samba_dn_syntax); i++) {
+		ret = ldb_dn_extended_add_syntax(ldb, LDB_ATTR_FLAG_FIXED, &samba_dn_syntax[i]);
+		if (ret != LDB_SUCCESS) {
+			return ret;
+		}
+
+	}
+
+	ret = ldb_register_samba_matching_rules(ldb);
+	if (ret != LDB_SUCCESS) {
+		talloc_free(ldb);
+		return LDB_SUCCESS;
+	}
+
+	ret = ldb_set_opaque(ldb, "SAMBA_HANDLERS_REGISTERED", (void*)1);
+	if (ret != LDB_SUCCESS) {
+		return ret;
+	}
+
+	return LDB_SUCCESS;
+}