s4:ldb: add infrastructure for extended dn handlers

This introduces a new set of pluggable syntax, for use on the
extended DN, and uses them when parsing the DN.

If the DN appears to be in the extended form, we no longer return the
full DN 'as is', but only return the normal part from
ldb_dn_get_linearized().

When validating/parsing the DN we validate not only the format of the
DN, but also the contents of the GUID or SID (to ensure they are
plausable).

We also have functions to set and get the extended components on the DN.

For now, extended_dn_get_linearized() returns a newly constructed and
allocated string each time.

Signed-off-by: Stefan Metzmacher <metze@samba.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/source4/lib/ldb/common/ldb_attributes.c b/source4/lib/ldb/common/ldb_attributes.c
index 747f2417811..48f9e11cafd 100644
--- a/source4/lib/ldb/common/ldb_attributes.c
+++ b/source4/lib/ldb/common/ldb_attributes.c
@@ -225,3 +225,50 @@ int ldb_setup_wellknown_attributes(struct ldb_context *ldb)
 	return LDB_SUCCESS;
 }
 
+
+/*
+  add a extended dn syntax to the ldb_schema
+*/
+int ldb_dn_extended_add_syntax(struct ldb_context *ldb, 
+			       unsigned flags,
+			       const struct ldb_dn_extended_syntax *syntax)
+{
+	int n;
+	struct ldb_dn_extended_syntax *a;
+
+	if (!syntax) {
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+
+	n = ldb->schema.num_dn_extended_syntax + 1;
+
+	a = talloc_realloc(ldb, ldb->schema.dn_extended_syntax,
+			   struct ldb_dn_extended_syntax, n);
+
+	if (!a) {
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+
+	a[ldb->schema.num_dn_extended_syntax] = *syntax;
+	ldb->schema.dn_extended_syntax = a;
+
+	ldb->schema.num_dn_extended_syntax = n;
+
+	return 0;
+}
+
+/*
+  return the extended dn syntax for a given name
+*/
+const struct ldb_dn_extended_syntax *ldb_dn_extended_syntax_by_name(struct ldb_context *ldb,
+								    const char *name)
+{
+	int i;
+	for (i=0; i < ldb->schema.num_dn_extended_syntax; i++) {
+		if (ldb_attr_cmp(ldb->schema.dn_extended_syntax[i].name, name) == 0) {
+			return &ldb->schema.dn_extended_syntax[i];
+		}
+	}
+	return NULL;
+}
+