s4/drs(tort): oid_from_attid() reference implementation

Decode Attribute OID using prefixMap and
ATTID received during replication

Based on MS documentation. See MS-DRSR.pdf - 5.16.4

2 files changed, 96 insertions, 1 deletions

diff --git a/source4/torture/drs/config.mk b/source4/torture/drs/config.mk
index 1044541c8a..a03034b5eb 100644
--- a/source4/torture/drs/config.mk
+++ b/source4/torture/drs/config.mk
@@ -17,6 +17,7 @@ PRIVATE_DEPENDENCIES = \
 #################################
 
 TORTURE_DRS_OBJ_FILES = \
-		$(torturesrcdir)/drs/drs_init.o
+		$(torturesrcdir)/drs/drs_init.o \
+		$(torturesrcdir)/drs/drs_util.o
 
 $(eval $(call proto_header_template,$(torturesrcdir)/drs/proto.h,$(TORTURE_DRS_OBJ_FILES:.o=.c)))
diff --git a/source4/torture/drs/drs_util.c b/source4/torture/drs/drs_util.c
new file mode 100644
index 0000000000..d4bfd81390
--- /dev/null
+++ b/source4/torture/drs/drs_util.c
@@ -0,0 +1,94 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   DRSUAPI utility functions to be used in torture tests
+
+   Copyright (C) Kamen Mazdrashki <kamen.mazdrashki@postpath.com> 2009
+
+   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/>.
+*/
+
+#include "includes.h"
+#include "torture/torture.h"
+#include "torture/rpc/drsuapi.h"
+#include "../lib/util/asn1.h"
+
+/**
+ * Decode Attribute OID based on MS documentation
+ * See MS-DRSR.pdf - 5.16.4
+ *
+ * On success returns decoded OID and
+ * corresponding prefix_map index (if requested)
+ */
+bool drs_util_oid_from_attid(struct torture_context *tctx,
+			     struct drsuapi_DsReplicaOIDMapping_Ctr *prefix_map,
+			     uint32_t attid,
+			     const char **_oid,
+			     int *map_idx)
+{
+	int i;
+	uint32_t hi_word, lo_word;
+	DATA_BLOB bin_oid = {NULL, 0};
+	struct drsuapi_DsReplicaOIDMapping *map_entry = NULL;
+	TALLOC_CTX *mem_ctx = talloc_named(tctx, 0, "util_drsuapi_oid_from_attid");
+
+	/* crack attid value */
+	hi_word = attid >> 16;
+	lo_word = attid & 0xFFFF;
+
+	/* check last entry in the prefix map is the special one */
+	map_entry = &prefix_map->mappings[prefix_map->num_mappings-1];
+	torture_assert(tctx,
+			(map_entry->id_prefix == 0)
+			&& (*map_entry->oid.binary_oid == 0xFF),
+			"Last entry in Prefix Map is not the special one!");
+
+	/* locate correspoding prefixMap entry */
+	map_entry = NULL;
+	for (i = 0; i < prefix_map->num_mappings - 1; i++) {
+
+		if (hi_word == prefix_map->mappings[i].id_prefix) {
+			map_entry = &prefix_map->mappings[i];
+			if (map_idx)	*map_idx = i;
+			break;
+		}
+	}
+
+	torture_assert(tctx, map_entry, "Unable to locate corresponding Prefix Map entry");
+
+	/* copy partial oid making enough room */
+	bin_oid.length = map_entry->oid.length + 2;
+	bin_oid.data = talloc_array(mem_ctx, uint8_t, bin_oid.length);
+	torture_assert(tctx, bin_oid.data, "Not enough memory");
+	memcpy(bin_oid.data, map_entry->oid.binary_oid, map_entry->oid.length);
+
+	if (lo_word < 128) {
+		bin_oid.length = bin_oid.length - 1;
+		bin_oid.data[bin_oid.length-1] = lo_word;
+	}
+	else {
+		if (lo_word == 32768) {
+			lo_word -= 32768;
+		}
+		bin_oid.data[bin_oid.length-2] = ((lo_word / 128) % 128) + 128; // (0x80 | ((lo_word>>7)&0x7f))
+		bin_oid.data[bin_oid.length-1] = lo_word % 128; // lo_word & 0x7f
+	}
+
+	torture_assert(tctx,
+			ber_read_OID_String(tctx, bin_oid, _oid),
+			"Failed to decode binary OID");
+	talloc_free(mem_ctx);
+
+	return true;
+}