1 files changed, 151 insertions, 1 deletions

diff --git a/source4/dsdb/samdb/ldb_modules/linked_attributes.c b/source4/dsdb/samdb/ldb_modules/linked_attributes.c
index f386795643..d3093dbd71 100644
--- a/source4/dsdb/samdb/ldb_modules/linked_attributes.c
+++ b/source4/dsdb/samdb/ldb_modules/linked_attributes.c
@@ -220,18 +220,168 @@ static int linked_attributes_add(struct ldb_module *module, struct ldb_request *
 /* modify */
 static int linked_attributes_modify(struct ldb_module *module, struct ldb_request *req)
 {
-	return ldb_next_request(module, req);
+	/* Look over list of modifications */
+	/* Find if any are for linked attributes */
+	/* Determine the effect of the modification */
+	/* Apply the modify to the linked entry */
+
+	int i, j, ret;
+	struct linked_attributes_context *ac;
+
+	const struct dsdb_schema *schema = dsdb_get_schema(module->ldb);
+	if (!schema) {
+		/* without schema, this doesn't make any sense */
+		return ldb_next_request(module, req);
+	}
+
+	if (ldb_dn_is_special(req->op.mod.message->dn)) {
+		/* do not manipulate our control entries */
+		return ldb_next_request(module, req);
+	}
+
+
+	ac = linked_attributes_init_handle(req, module);
+	if (!ac) {
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+	
+	/* prepare the first operation */
+	ac->down_req = talloc_realloc(ac, ac->down_req, 
+				      struct ldb_request *, 1);
+	if (!ac->down_req) {
+		ldb_oom(ac->module->ldb);
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+	
+	ac->down_req[0] = talloc(ac->down_req, struct ldb_request);
+	if (!ac->down_req[0]) {
+		ldb_oom(ac->module->ldb);
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+	*(ac->down_req[0]) = *req; /* copy the request */
+	
+	ac->num_requests++;
+	
+	/* Run the original request */
+	ret = ldb_next_request(module, req);
+	if (ret != LDB_SUCCESS) {
+		return ret;
+	}
+
+	for (i=0; i < req->op.mod.message->num_elements; i++) {
+		const struct dsdb_attribute *target_attr;
+		const struct ldb_message_element *el = &req->op.mod.message->elements[i];
+		const struct dsdb_attribute *schema_attr
+			= dsdb_attribute_by_lDAPDisplayName(schema, el->name);
+		if (!schema_attr) {
+			ldb_asprintf_errstring(module->ldb, 
+					       "attribute %s is not a valid attribute in schema", req->op.mod.message->elements[i].name);
+			return LDB_ERR_OBJECT_CLASS_VIOLATION;			
+		}
+		/* We have a valid attribute, not find out if it is linked */
+		if (schema_attr->linkID == 0) {
+			continue;
+		}
+		
+		if ((schema_attr->linkID & 1) == 1) {
+			/* Odd is for the target.  Illigal to modify */
+			ldb_asprintf_errstring(module->ldb, 
+					       "attribute %s must not be modified directly, it is a linked attribute", req->op.mod.message->elements[i].name);
+			return LDB_ERR_UNWILLING_TO_PERFORM;
+		}
+		
+		/* Even link IDs are for the originating attribute */
+		
+		/* Now find the target attribute */
+		target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID + 1);
+		if (!target_attr) {
+			ldb_asprintf_errstring(module->ldb, 
+					       "attribute %s does not have valid link target", req->op.mod.message->elements[i].name);
+			return LDB_ERR_OBJECT_CLASS_VIOLATION;			
+		}
+
+		if ((el->flags & LDB_FLAG_MOD_MASK) == LDB_FLAG_MOD_REPLACE) {
+			ldb_asprintf_errstring(module->ldb, 
+					       "attribute %s may not be replaced, only added or deleted", req->op.mod.message->elements[i].name);
+			return LDB_ERR_UNWILLING_TO_PERFORM;
+		}
+		/* Prepare the modify (mod element) on the targets */
+
+		/* For each value being moded, we need to setup the modify */
+		for (j=0; j < el->num_values; j++) {
+			struct ldb_request *new_req;
+			/* Create the modify request */
+			struct ldb_message *new_msg = ldb_msg_new(ac->down_req);
+			if (!new_msg) {
+				ldb_oom(module->ldb);
+				return LDB_ERR_OPERATIONS_ERROR;
+			}
+			new_msg->dn = ldb_dn_new(new_msg, module->ldb, (char *)el->values[j].data);
+			if (!new_msg->dn) {
+				ldb_asprintf_errstring(module->ldb, 
+					       "attribute %s value %s was not a valid DN", req->op.mod.message->elements[i].name,
+						       el->values[j].data);
+				return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
+			}
+
+			ret = ldb_msg_add_empty(new_msg, target_attr->lDAPDisplayName, 
+						el->flags & LDB_FLAG_MOD_MASK, NULL);
+			if (ret != LDB_SUCCESS) {
+				return ret;
+			}
+			
+			ret = ldb_msg_add_string(new_msg, target_attr->lDAPDisplayName, 
+						 ldb_dn_get_linearized(ac->orig_req->op.add.message->dn));
+			if (ret != LDB_SUCCESS) {
+				return ret;
+			}
+
+			ret = ldb_build_mod_req(&new_req, module->ldb, ac->down_req,
+						new_msg,
+						NULL,
+						NULL,
+						NULL);
+			if (ret != LDB_SUCCESS) {
+				return ret;
+			}
+			
+			talloc_steal(new_req, new_msg);
+			
+			ldb_set_timeout_from_prev_req(module->ldb, req, new_req);
+			
+			/* Now add it to the list */
+			ac->down_req = talloc_realloc(ac, ac->down_req, 
+						      struct ldb_request *, ac->num_requests + 1);
+			if (!ac->down_req) {
+				ldb_oom(ac->module->ldb);
+				return LDB_ERR_OPERATIONS_ERROR;
+			}
+			ac->down_req[ac->num_requests] = new_req;
+			ac->num_requests++;
+
+			/* Run the new request */
+			ret = ldb_next_request(module, new_req);
+			if (ret != LDB_SUCCESS) {
+				return ret;
+			}
+		}
+	}
+	return ret;
 }
 
 /* delete */
 static int linked_attributes_delete(struct ldb_module *module, struct ldb_request *req)
 {
+	/* Look up list of linked attributes */
+	/* Search to see if any linked attributes are in this entry */
 	return ldb_next_request(module, req);
 }
 
 /* rename */
 static int linked_attributes_rename(struct ldb_module *module, struct ldb_request *req)
 {
+	/* Look up list of linked attributes */
+	/* Search to see if any linked attributes are in this entry */
 	return ldb_next_request(module, req);
 }