s4/schema: Move msDS-IntId implementation to samldb.c module

msDS-IntId attribute should be replicated, so it must be
implemented in a module that is before repl_meta_data module
(thanks abartlet for pointing this out).

Signed-off-by: Andrew Bartlett <abartlet@samba.org>

2 files changed, 87 insertions, 149 deletions

diff --git a/source4/dsdb/samdb/ldb_modules/samldb.c b/source4/dsdb/samdb/ldb_modules/samldb.c
index 9d79776e668..6420e05ba89 100644
--- a/source4/dsdb/samdb/ldb_modules/samldb.c
+++ b/source4/dsdb/samdb/ldb_modules/samldb.c
@@ -689,6 +689,81 @@ static int samldb_find_for_defaultObjectCategory(struct samldb_ctx *ac)
 	return ldb_next_request(ac->module, req);
 }
 
+/**
+ * msDS-IntId attributeSchema attribute handling
+ * during LDB_ADD request processing
+ */
+static int samldb_add_handle_msDS_IntId(struct samldb_ctx *ac)
+{
+	int ret;
+	bool id_exists;
+	uint32_t msds_intid;
+	uint32_t system_flags;
+	struct ldb_context *ldb;
+	struct ldb_result *ldb_res;
+	struct ldb_dn *schema_dn;
+
+	ldb = ldb_module_get_ctx(ac->module);
+	schema_dn = ldb_get_schema_basedn(ldb);
+
+	/* replicated update should always go through */
+	if (ldb_request_get_control(ac->req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
+		return LDB_SUCCESS;
+	}
+
+	/* msDS-IntId is handled by system and should never be
+	 * passed by clients */
+	if (ldb_msg_find_element(ac->msg, "msDS-IntId")) {
+		return LDB_ERR_UNWILLING_TO_PERFORM;
+	}
+
+	/* do not generate msDS-IntId if Relax control is passed */
+	if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) {
+		return LDB_SUCCESS;
+	}
+
+	/* check Functional Level */
+	if (dsdb_functional_level(ldb) < DS_DOMAIN_FUNCTION_2003) {
+		return LDB_SUCCESS;
+	}
+
+	/* check systemFlags for SCHEMA_BASE_OBJECT flag */
+	system_flags = ldb_msg_find_attr_as_uint(ac->msg, "systemFlags", 0);
+	if (system_flags & SYSTEM_FLAG_SCHEMA_BASE_OBJECT) {
+		return LDB_SUCCESS;
+	}
+
+	/* Generate new value for msDs-IntId
+	 * Value should be in 0x80000000..0xBFFFFFFF range */
+	msds_intid = generate_random() % 0X3FFFFFFF;
+	msds_intid += 0x80000000;
+
+	/* probe id values until unique one is found */
+	do {
+		msds_intid++;
+		if (msds_intid > 0xBFFFFFFF) {
+			msds_intid = 0x80000001;
+		}
+
+		ret = dsdb_module_search(ac->module, ac,
+		                         &ldb_res,
+		                         schema_dn, LDB_SCOPE_ONELEVEL, NULL, 0,
+		                         "(msDS-IntId=%d)", msds_intid);
+		if (ret != LDB_SUCCESS) {
+			ldb_debug_set(ldb, LDB_DEBUG_ERROR,
+				      __location__": Searching for msDS-IntId=%d failed - %s\n",
+				      msds_intid,
+				      ldb_errstring(ldb));
+			return LDB_ERR_OPERATIONS_ERROR;
+		}
+		id_exists = (ldb_res->count > 0);
+
+		talloc_free(ldb_res);
+	} while(id_exists);
+
+	return ldb_msg_add_fmt(ac->msg, "msDS-IntId", "%d", msds_intid);
+}
+
 
 /*
  * samldb_add_entry (async)
@@ -870,6 +945,10 @@ static int samldb_fill_object(struct samldb_ctx *ac, const char *type)
 			}
 		}
 
+		/* handle msDS-IntID attribute */
+		ret = samldb_add_handle_msDS_IntId(ac);
+		if (ret != LDB_SUCCESS) return ret;
+
 		ret = samldb_add_step(ac, samldb_add_entry);
 		if (ret != LDB_SUCCESS) return ret;
 
@@ -1763,6 +1842,14 @@ static int samldb_modify(struct ldb_module *module, struct ldb_request *req)
 		return LDB_ERR_UNWILLING_TO_PERFORM;
 	}
 
+	/* msDS-IntId is not allowed to be modified
+	 * except when modification comes from replication */
+	if (ldb_msg_find_element(req->op.mod.message, "msDS-IntId")) {
+		if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
+			return LDB_ERR_CONSTRAINT_VIOLATION;
+		}
+	}
+
 	/* TODO: do not modify original request, create a new one */
 
 	el = ldb_msg_find_element(req->op.mod.message, "groupType");
diff --git a/source4/dsdb/samdb/ldb_modules/schema_data.c b/source4/dsdb/samdb/ldb_modules/schema_data.c
index 8125a46cbb0..d15c6756751 100644
--- a/source4/dsdb/samdb/ldb_modules/schema_data.c
+++ b/source4/dsdb/samdb/ldb_modules/schema_data.c
@@ -92,37 +92,6 @@ struct schema_data_search_data {
 	const struct dsdb_schema *schema;
 };
 
-/* context to be used during async operations */
-struct schema_data_context {
-	struct ldb_module *module;
-	struct ldb_request *req;
-
-	const struct dsdb_schema *schema;
-};
-
-/* Create new context using
- * ldb_request as memory context */
-static int _schema_data_context_new(struct ldb_module *module,
-				    struct ldb_request *req,
-				    struct schema_data_context **pac)
-{
-	struct schema_data_context *ac;
-	struct ldb_context *ldb;
-
-	ldb = ldb_module_get_ctx(module);
-
-	*pac = ac = talloc_zero(req, struct schema_data_context);
-	if (ac == NULL) {
-		ldb_oom(ldb);
-		return LDB_ERR_OPERATIONS_ERROR;
-	}
-	ac->module = module;
-	ac->req = req;
-	ac->schema = dsdb_get_schema(ldb);
-
-	return LDB_SUCCESS;
-}
-
 static int schema_data_init(struct ldb_module *module)
 {
 	struct ldb_context *ldb;
@@ -163,57 +132,6 @@ static int schema_data_init(struct ldb_module *module)
 	return LDB_SUCCESS;
 }
 
-
-/* Generate new value for msDs-IntId
- * Value should be in 0x80000000..0xBFFFFFFF range
- * Generated value is added ldb_msg */
-static int _schema_data_gen_msds_intid(struct schema_data_context *ac,
-				       struct ldb_message *ldb_msg)
-{
-	uint32_t id;
-
-	/* generate random num in 0x80000000..0xBFFFFFFF */
-	id = generate_random() % 0X3FFFFFFF;
-	id += 0x80000000;
-
-	/* make sure id is unique and adjust if not */
-	while (dsdb_attribute_by_attributeID_id(ac->schema, id)) {
-		id++;
-		if (id > 0xBFFFFFFF) {
-			id = 0x80000001;
-		}
-	}
-
-	/* add generated msDS-IntId value to ldb_msg */
-	return ldb_msg_add_fmt(ldb_msg, "msDS-IntId", "%d", id);
-}
-
-static int _schema_data_add_callback(struct ldb_request *req,
-				     struct ldb_reply *ares)
-{
-	struct schema_data_context *ac;
-
-	ac = talloc_get_type(req->context, struct schema_data_context);
-
-	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);
-	}
-
-	if (ares->type != LDB_REPLY_DONE) {
-		talloc_free(ares);
-		return ldb_module_done(ac->req, NULL, NULL,
-					LDB_ERR_OPERATIONS_ERROR);
-	}
-
-	return ldb_module_done(ac->req, ares->controls,
-				ares->response, ares->error);
-}
-
 static int schema_data_add(struct ldb_module *module, struct ldb_request *req)
 {
 	struct ldb_context *ldb;
@@ -251,11 +169,6 @@ static int schema_data_add(struct ldb_module *module, struct ldb_request *req)
 	governsID = ldb_msg_find_ldb_val(req->op.add.message, "governsID");
 
 	if (attributeID) {
-		/* Sanity check for not allowed attributes */
-		if (ldb_msg_find_ldb_val(req->op.add.message, "msDS-IntId")) {
-			return LDB_ERR_UNWILLING_TO_PERFORM;
-		}
-
 		oid_attr = "attributeID";
 		oid = talloc_strndup(req, (const char *)attributeID->data, attributeID->length);
 	} else if (governsID) {
@@ -290,67 +203,6 @@ static int schema_data_add(struct ldb_module *module, struct ldb_request *req)
 		}
 	}
 
-	/* bypass further processing if CONTROL_RELAX is set */
-	if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID)) {
-		return ldb_next_request(module, req);
-	}
-
-	/* generate and add msDS-IntId attr value */
-	if (attributeID
-	    && (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2003)
-	    && !(ldb_msg_find_attr_as_uint(req->op.add.message, "systemFlags", 0) & SYSTEM_FLAG_SCHEMA_BASE_OBJECT)) {
-		struct ldb_message *msg;
-		struct schema_data_context *ac;
-		struct ldb_request *add_req;
-
-		if (_schema_data_context_new(module, req, &ac) != LDB_SUCCESS) {
-			return LDB_ERR_OPERATIONS_ERROR;
-		}
-
-		/* we have to copy the message as the caller might have it as a const */
-		msg = ldb_msg_copy_shallow(ac, req->op.add.message);
-		if (msg == NULL) {
-			ldb_oom(ldb);
-			return LDB_ERR_OPERATIONS_ERROR;
-		}
-
-		/* generate unique value for msDS-IntId attr value */
-		if (_schema_data_gen_msds_intid(ac, msg) != LDB_SUCCESS) {
-			ldb_debug_set(ldb, LDB_DEBUG_ERROR,
-			              "_schema_data_gen_msds_intid() failed to generate msDS-IntId value\n");
-			return LDB_ERR_OPERATIONS_ERROR;
-		}
-
-		ldb_build_add_req(&add_req, ldb, ac,
-				  msg,
-				  req->controls,
-				  ac, _schema_data_add_callback,
-				  req);
-
-		return ldb_next_request(module, add_req);
-	}
-
-	return ldb_next_request(module, req);
-}
-
-static int schema_data_modify(struct ldb_module *module, struct ldb_request *req)
-{
-	/* special objects should always go through */
-	if (ldb_dn_is_special(req->op.mod.message->dn)) {
-		return ldb_next_request(module, req);
-	}
-
-	/* replicated update should always go through */
-	if (ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
-		return ldb_next_request(module, req);
-	}
-
-	/* msDS-IntId is not allowed to be modified */
-	if (ldb_msg_find_ldb_val(req->op.mod.message, "msDS-IntId")) {
-		return LDB_ERR_CONSTRAINT_VIOLATION;
-	}
-
-	/* go on with the call chain */
 	return ldb_next_request(module, req);
 }
 
@@ -609,6 +461,5 @@ _PUBLIC_ const struct ldb_module_ops ldb_schema_data_module_ops = {
 	.name		= "schema_data",
 	.init_context	= schema_data_init,
 	.add		= schema_data_add,
-	.modify		= schema_data_modify,
 	.search         = schema_data_search
 };