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path: root/source4/dsdb/samdb/ldb_modules/extended_dn_out.c
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/* 
   ldb database library

   Copyright (C) Simo Sorce 2005-2008
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2007-2008

   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/>.
*/

/*
 *  Name: ldb
 *
 *  Component: ldb extended dn control module
 *
 *  Description: this module builds a special dn for returned search
 *  results, and fixes some other aspects of the result (returned case issues)
 *  values.
 *
 *  Authors: Simo Sorce
 *           Andrew Bartlett
 */

#include "includes.h"
#include "ldb/include/ldb.h"
#include "ldb/include/ldb_errors.h"
#include "ldb/include/ldb_private.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "librpc/ndr/libndr.h"
#include "dsdb/samdb/samdb.h"

struct extended_dn_out_private {
	bool dereference;
	bool normalise;
	struct dsdb_openldap_dereference_control *dereference_control;
};

static bool is_attr_in_list(const char * const * attrs, const char *attr)
{
	int i;

	for (i = 0; attrs[i]; i++) {
		if (ldb_attr_cmp(attrs[i], attr) == 0)
			return true;
	}

	return false;
}

static char **copy_attrs(void *mem_ctx, const char * const * attrs)
{
	char **new;
	int i, num;

	for (num = 0; attrs[num]; num++);

	new = talloc_array(mem_ctx, char *, num + 1);
	if (!new) return NULL;

	for(i = 0; i < num; i++) {
		new[i] = talloc_strdup(new, attrs[i]);
		if (!new[i]) {
			talloc_free(new);
			return NULL;
		}
	}
	new[i] = NULL;

	return new;
}

static bool add_attrs(void *mem_ctx, char ***attrs, const char *attr)
{
	char **new;
	int num;

	for (num = 0; (*attrs)[num]; num++);

	new = talloc_realloc(mem_ctx, *attrs, char *, num + 2);
	if (!new) return false;

	*attrs = new;

	new[num] = talloc_strdup(new, attr);
	if (!new[num]) return false;

	new[num + 1] = NULL;

	return true;
}

/* Fix the DN so that the relative attribute names are in upper case so that the DN:
   cn=Adminstrator,cn=users,dc=samba,dc=example,dc=com becomes
   CN=Adminstrator,CN=users,DC=samba,DC=example,DC=com
*/


static int fix_dn(struct ldb_dn *dn) 
{
	int i, ret;
	char *upper_rdn_attr;

	for (i=0; i < ldb_dn_get_comp_num(dn); i++) {
		/* We need the attribute name in upper case */
		upper_rdn_attr = strupper_talloc(dn,
						 ldb_dn_get_component_name(dn, i));
		if (!upper_rdn_attr) {
			return LDB_ERR_OPERATIONS_ERROR;
		}
		
		/* And replace it with CN=foo (we need the attribute in upper case */
		ret = ldb_dn_set_component(dn, i, upper_rdn_attr,
					   *ldb_dn_get_component_val(dn, i));
		talloc_free(upper_rdn_attr);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
	}
	return LDB_SUCCESS;
}

/* Inject the extended DN components, so the DN cn=Adminstrator,cn=users,dc=samba,dc=example,dc=com becomes
   <GUID=541203ae-f7d6-47ef-8390-bfcf019f9583>;<SID=S-1-5-21-4177067393-1453636373-93818737-500>;cn=Adminstrator,cn=users,dc=samba,dc=example,dc=com */

static int inject_extended_dn_out(struct ldb_reply *ares,
				  struct ldb_context *ldb,
				  int type,
				  bool remove_guid,
				  bool remove_sid)
{
	int ret;
	const DATA_BLOB *guid_blob;
	const DATA_BLOB *sid_blob;

	guid_blob = ldb_msg_find_ldb_val(ares->message, "objectGUID");
	sid_blob = ldb_msg_find_ldb_val(ares->message, "objectSID");

	if (!guid_blob) {
		ldb_set_errstring(ldb, "Did not find objectGUID to inject into extended DN");
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ret = ldb_dn_set_extended_component(ares->message->dn, "GUID", guid_blob);
	if (ret != LDB_SUCCESS) {
		return ret;
	}
	if (sid_blob) {
		ret = ldb_dn_set_extended_component(ares->message->dn, "SID", sid_blob);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
	}

	if (remove_guid) {
		ldb_msg_remove_attr(ares->message, "objectGUID");
	}

	if (sid_blob && remove_sid) {
		ldb_msg_remove_attr(ares->message, "objectSID");
	}

	return LDB_SUCCESS;
}

static int handle_dereference(struct ldb_dn *dn,
			      struct dsdb_openldap_dereference_result **dereference_attrs, 
			      const char *attr, const DATA_BLOB *val)
{
	const struct ldb_val *entryUUIDblob, *sid_blob;
	struct ldb_message fake_msg; /* easier to use routines that expect an ldb_message */
	int j;
	
	fake_msg.num_elements = 0;
			
	/* Look for this attribute in the returned control */
	for (j = 0; dereference_attrs && dereference_attrs[j]; j++) {
		struct ldb_val source_dn = data_blob_string_const(dereference_attrs[j]->dereferenced_dn);
		if (ldb_attr_cmp(dereference_attrs[j]->source_attribute, attr) == 0
		    && data_blob_cmp(&source_dn, val) == 0) {
			fake_msg.num_elements = dereference_attrs[j]->num_attributes;
			fake_msg.elements = dereference_attrs[j]->attributes;
			break;
		}
	}
	if (!fake_msg.num_elements) {
		return LDB_SUCCESS;
	}
	/* Look for an OpenLDAP entryUUID */
	
	entryUUIDblob = ldb_msg_find_ldb_val(&fake_msg, "entryUUID");
	if (entryUUIDblob) {
		NTSTATUS status;
		enum ndr_err_code ndr_err;
		
		struct ldb_val guid_blob;
		struct GUID guid;
		
		status = GUID_from_data_blob(entryUUIDblob, &guid);
		
		if (!NT_STATUS_IS_OK(status)) {
			return LDB_ERR_INVALID_DN_SYNTAX;
		}
		ndr_err = ndr_push_struct_blob(&guid_blob, NULL, NULL, &guid,
					       (ndr_push_flags_fn_t)ndr_push_GUID);
		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
			return LDB_ERR_INVALID_DN_SYNTAX;
		}
		
		ldb_dn_set_extended_component(dn, "GUID", &guid_blob);
	}
	
	sid_blob = ldb_msg_find_ldb_val(&fake_msg, "objectSID");
	
	/* Look for the objectSID */
	if (sid_blob) {
		ldb_dn_set_extended_component(dn, "SID", sid_blob);
	}
	return LDB_SUCCESS;
}

/* search */
struct extended_search_context {
	struct ldb_module *module;
	const struct dsdb_schema *schema;
	struct ldb_request *req;
	bool inject;
	bool remove_guid;
	bool remove_sid;
	int extended_type;
};

static int extended_callback(struct ldb_request *req, struct ldb_reply *ares)
{
	struct extended_search_context *ac;
	struct ldb_control *control;
	struct dsdb_openldap_dereference_result_control *dereference_control = NULL;
	int ret, i, j;
	struct ldb_message *msg = ares->message;
	struct extended_dn_out_private *private;

	ac = talloc_get_type(req->context, struct extended_search_context);
	private = talloc_get_type(ac->module->private_data, struct extended_dn_out_private);

	if (!ares) {
		return ldb_module_done(ac->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}
	if (ares->error != LDB_SUCCESS) {
		return ldb_module_done(ac->req, ares->controls,
					ares->response, ares->error);
	}

	switch (ares->type) {
	case LDB_REPLY_REFERRAL:
		return ldb_module_send_referral(ac->req, ares->referral);

	case LDB_REPLY_DONE:
		return ldb_module_done(ac->req, ares->controls,
					ares->response, LDB_SUCCESS);
	case LDB_REPLY_ENTRY:
		break;
	}

	if (private && private->normalise) {
		ret = fix_dn(ares->message->dn);
		if (ret != LDB_SUCCESS) {
			return ldb_module_done(ac->req, NULL, NULL, ret);
		}
	}
			
	if (ac->inject) {
		/* for each record returned post-process to add any derived
		   attributes that have been asked for */
		ret = inject_extended_dn_out(ares, ac->module->ldb,
					     ac->extended_type, ac->remove_guid,
					     ac->remove_sid);
		if (ret != LDB_SUCCESS) {
			return ldb_module_done(ac->req, NULL, NULL, ret);
		}
	}

	if ((private && private->normalise) || ac->inject) {
		const struct ldb_val *val = ldb_msg_find_ldb_val(ares->message, "distinguishedName");
		if (val) {
			ldb_msg_remove_attr(ares->message, "distinguishedName");
			if (ac->inject) {
				ret = ldb_msg_add_steal_string(ares->message, "distinguishedName", 
							       ldb_dn_get_extended_linearized(ares->message, ares->message->dn, ac->extended_type));
			} else {
				ret = ldb_msg_add_string(ares->message, "distinguishedName", 
							 ldb_dn_get_linearized(ares->message->dn));
			}
			if (ret != LDB_SUCCESS) {
				ldb_oom(ac->module->ldb);
				return LDB_ERR_OPERATIONS_ERROR;
			}
		}
	}

	if (private && private->dereference) {
		control = ldb_reply_get_control(ares, DSDB_OPENLDAP_DEREFERENCE_CONTROL);
	
		if (control && control->data) {
			dereference_control = talloc_get_type(control->data, struct dsdb_openldap_dereference_result_control);
		}
	}

	/* Walk the retruned elements (but only if we have a schema to interpret the list with) */
	for (i = 0; ac->schema && i < msg->num_elements; i++) {
		const struct dsdb_attribute *attribute;
		attribute = dsdb_attribute_by_lDAPDisplayName(ac->schema, msg->elements[i].name);
		if (!attribute) {
			continue;
		}

		if (private->normalise) {
			/* If we are also in 'normalise' mode, then
			 * fix the attribute names to be in the
			 * correct case */
			msg->elements[i].name = talloc_strdup(msg->elements, attribute->lDAPDisplayName);
			if (!msg->elements[i].name) {
				ldb_oom(ac->module->ldb);
				return ldb_module_done(ac->req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
			}
		}

		/* distinguishedName has been dealt with above */
		if (ldb_attr_cmp(msg->elements[i].name, "distinguishedName") == 0) {
			continue;
		}

		/* Look to see if this attributeSyntax is a DN */
		if (strcmp(attribute->attributeSyntax_oid, "2.5.5.1") != 0) {
			continue;
		}

		for (j = 0; j < msg->elements[i].num_values; j++) {
			const char *dn_str;
			struct ldb_dn *dn = ldb_dn_from_ldb_val(ac, ac->module->ldb, &msg->elements[i].values[j]);
			if (!dn || !ldb_dn_validate(dn)) {
				return ldb_module_done(ac->req, NULL, NULL, LDB_ERR_INVALID_DN_SYNTAX);
			}

			if (private->normalise) {
				ret = fix_dn(dn);
				if (ret != LDB_SUCCESS) {
					return ldb_module_done(ac->req, NULL, NULL, ret);
				}
			}
			
			/* If we are running in dereference mode (such
			 * as against OpenLDAP) then the DN in the msg
			 * above does not contain the extended values,
			 * and we need to look in the dereference
			 * result */

			/* Look for this value in the attribute */

			if (dereference_control) {
				ret = handle_dereference(dn, 
							 dereference_control->attributes,
							 msg->elements[i].name,
							 &msg->elements[i].values[j]);
				if (ret != LDB_SUCCESS) {
					return ldb_module_done(ac->req, NULL, NULL, ret);
				}
			}
			
			if (!ac->inject) {
				dn_str = talloc_steal(msg->elements[i].values, 
						      ldb_dn_get_linearized(dn));
			} else {
				dn_str = talloc_steal(msg->elements[i].values, 
						      ldb_dn_get_extended_linearized(msg->elements[i].values, 
										     dn, ac->extended_type));
			}
			if (!dn_str) {
				ldb_oom(ac->module->ldb);
				return ldb_module_done(ac->req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR);
			}
			msg->elements[i].values[j] = data_blob_string_const(dn_str);
			talloc_free(dn);
		}
	}
	return ldb_module_send_entry(ac->req, msg, ares->controls);
}


static int extended_dn_out_search(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_control *control;
	struct ldb_control *storage_format_control;
	struct ldb_extended_dn_control *extended_ctrl = NULL;
	struct ldb_control **saved_controls;
	struct extended_search_context *ac;
	struct ldb_request *down_req;
	char **new_attrs;
	const char * const *const_attrs;
	int ret;

	struct extended_dn_out_private *private = talloc_get_type(module->private_data, struct extended_dn_out_private);

	/* check if there's an extended dn control */
	control = ldb_request_get_control(req, LDB_CONTROL_EXTENDED_DN_OID);
	if (control && control->data) {
		extended_ctrl = talloc_get_type(control->data, struct ldb_extended_dn_control);
		if (!extended_ctrl) {
			return LDB_ERR_PROTOCOL_ERROR;
		}
	}

	/* Look to see if, as we are in 'store DN+GUID+SID' mode, the
	 * client is after the storage format (to fill in linked
	 * attributes) */
	storage_format_control = ldb_request_get_control(req, DSDB_CONTROL_DN_STORAGE_FORMAT_OID);
	if (!control && storage_format_control && storage_format_control->data) {
		extended_ctrl = talloc_get_type(storage_format_control->data, struct ldb_extended_dn_control);
		if (!extended_ctrl) {
			ldb_set_errstring(module->ldb, "extended_dn_out: extended_ctrl was of the wrong data type");
			return LDB_ERR_PROTOCOL_ERROR;
		}
	}

	ac = talloc_zero(req, struct extended_search_context);
	if (ac == NULL) {
		ldb_oom(module->ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ac->module = module;
	ac->schema = dsdb_get_schema(module->ldb);
	ac->req = req;
	ac->inject = false;
	ac->remove_guid = false;
	ac->remove_sid = false;
	
	const_attrs = req->op.search.attrs;

	/* We only need to do special processing if we were asked for
	 * the extended DN, or we are 'store DN+GUID+SID'
	 * (!dereference) mode.  (This is the normal mode for LDB on
	 * tdb). */
	if (control || (storage_format_control && private && !private->dereference)) {
		ac->inject = true;
		if (extended_ctrl) {
			ac->extended_type = extended_ctrl->type;
		} else {
			ac->extended_type = 0;
		}

		/* check if attrs only is specified, in that case check wether we need to modify them */
		if (req->op.search.attrs && !is_attr_in_list(req->op.search.attrs, "*")) {
			if (! is_attr_in_list(req->op.search.attrs, "objectGUID")) {
				ac->remove_guid = true;
			}
			if (! is_attr_in_list(req->op.search.attrs, "objectSID")) {
				ac->remove_sid = true;
			}
			if (ac->remove_guid || ac->remove_sid) {
				new_attrs = copy_attrs(ac, req->op.search.attrs);
				if (new_attrs == NULL) {
					ldb_oom(module->ldb);
					return LDB_ERR_OPERATIONS_ERROR;
				}

				if (ac->remove_guid) {
					if (!add_attrs(ac, &new_attrs, "objectGUID"))
						return LDB_ERR_OPERATIONS_ERROR;
				}
				if (ac->remove_sid) {
					if (!add_attrs(ac, &new_attrs, "objectSID"))
						return LDB_ERR_OPERATIONS_ERROR;
				}
				const_attrs = (const char * const *)new_attrs;
			}
		}
	}

	ret = ldb_build_search_req_ex(&down_req,
				      module->ldb, ac,
				      req->op.search.base,
				      req->op.search.scope,
				      req->op.search.tree,
				      const_attrs,
				      req->controls,
				      ac, extended_callback,
				      req);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	/* Remove extended DN and storage format controls */

	if (control) {
		/* save it locally and remove it from the list */
		/* we do not need to replace them later as we
		 * are keeping the original req intact */
		if (!save_controls(control, down_req, &saved_controls)) {
			return LDB_ERR_OPERATIONS_ERROR;
		}
	}

	if (storage_format_control) {
		/* save it locally and remove it from the list */
		/* we do not need to replace them later as we
		 * are keeping the original req intact */
		if (!save_controls(storage_format_control, down_req, &saved_controls)) {
			return LDB_ERR_OPERATIONS_ERROR;
		}
	}

	/* Add in dereference control, if we were asked to, we are
	 * using the 'dereference' mode (such as with an OpenLDAP
	 * backend) and have the control prepared */
	if (control && private && private->dereference && private->dereference_control) {
		ret = ldb_request_add_control(down_req,
					      DSDB_OPENLDAP_DEREFERENCE_CONTROL,
					      false, private->dereference_control);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
	}

	/* perform the search */
	return ldb_next_request(module, down_req);
}

static int extended_dn_out_ldb_init(struct ldb_module *module)
{
	int ret;

	struct extended_dn_out_private *private = talloc(module, struct extended_dn_out_private);

	module->private_data = private;

	if (!private) {
		ldb_oom(module->ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	private->dereference = false;
	private->normalise = false;

	ret = ldb_mod_register_control(module, LDB_CONTROL_EXTENDED_DN_OID);
	if (ret != LDB_SUCCESS) {
		ldb_debug(module->ldb, LDB_DEBUG_ERROR,
			"extended_dn_out: Unable to register control with rootdse!\n");
		return LDB_ERR_OPERATIONS_ERROR;
	}

	return ldb_next_init(module);
}

static int extended_dn_out_dereference_init(struct ldb_module *module)
{
	int ret, i = 0;
	struct extended_dn_out_private *private;
	struct dsdb_openldap_dereference_control *dereference_control;
	struct dsdb_attribute *cur;

	struct dsdb_schema *schema;

	module->private_data = private = talloc_zero(module, struct extended_dn_out_private);

	if (!private) {
		ldb_oom(module->ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	private->dereference = true;

	/* At the moment, servers that need dereference also need the
	 * DN and attribute names to be normalised */
	private->normalise = true;

	ret = ldb_mod_register_control(module, LDB_CONTROL_EXTENDED_DN_OID);
	if (ret != LDB_SUCCESS) {
		ldb_debug(module->ldb, LDB_DEBUG_ERROR,
			"extended_dn_out: Unable to register control with rootdse!\n");
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ret = ldb_next_init(module);

	if (ret != LDB_SUCCESS) {
		return ret;
	}

	schema = dsdb_get_schema(module->ldb);
	if (!schema) {
		/* No schema on this DB (yet) */
		return LDB_SUCCESS;
	}

	private->dereference_control = dereference_control
		= talloc_zero(private, struct dsdb_openldap_dereference_control);

	if (!private->dereference_control) {
		ldb_oom(module->ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	
	for (cur = schema->attributes; cur; cur = cur->next) {
		static const char *attrs[] = {
			"entryUUID",
			"objectSID",
			NULL
		};

		if (strcmp(cur->syntax->attributeSyntax_oid, "2.5.5.1") != 0) {
			continue;
		}
		dereference_control->dereference
			= talloc_realloc(private, dereference_control->dereference, 
					 struct dsdb_openldap_dereference *, i + 2);
		if (!dereference_control) {
			ldb_oom(module->ldb);
			return LDB_ERR_OPERATIONS_ERROR;
		}
		dereference_control->dereference[i] = talloc(dereference_control->dereference,  
					 struct dsdb_openldap_dereference);
		if (!dereference_control->dereference[i]) {
			ldb_oom(module->ldb);
			return LDB_ERR_OPERATIONS_ERROR;
		}
		dereference_control->dereference[i]->source_attribute = cur->lDAPDisplayName;
		dereference_control->dereference[i]->dereference_attribute = attrs;
		i++;
		dereference_control->dereference[i] = NULL;
	}
	return LDB_SUCCESS;
}

_PUBLIC_ const struct ldb_module_ops ldb_extended_dn_out_ldb_module_ops = {
	.name		   = "extended_dn_out_ldb",
	.search            = extended_dn_out_search,
	.init_context	   = extended_dn_out_ldb_init,
};


_PUBLIC_ const struct ldb_module_ops ldb_extended_dn_out_dereference_module_ops = {
	.name		   = "extended_dn_out_dereference",
	.search            = extended_dn_out_search,
	.init_context	   = extended_dn_out_dereference_init,
};