bdb: Make 'futility show' support BDB

This patch makes futility show command support boot block descriptor (BDB)
of the common boot flow.

BUG=chromium:649554
BRANCH=none
TEST=make runtests. Ran futility show bdb.bin.

Change-Id: I5f199a32ab1c268351e822e37ed39e41ae19bc7a
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/388631
Reviewed-by: Randall Spangler <rspangler@chromium.org>

Makefile

@@ -691,7 +691,8 @@ FUTIL_SRCS = \
 	futility/file_type_rwsig.c \
 	futility/file_type_usbpd1.c \
 	futility/vb1_helper.c \
-	futility/vb2_helper.c
+	futility/vb2_helper.c \
+	futility/bdb_helper.c
 
 # List of commands built in futility and futility_s.
 FUTIL_STATIC_CMD_LIST = ${BUILD}/gen/futility_static_cmds.c

futility/bdb_helper.c

@@ -0,0 +1,68 @@
+/* Copyright 2016 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Boot descriptor block helper functions
+ */
+
+#include <stdio.h>
+
+#include "2sha.h"
+#include "bdb.h"
+#include "bdb_struct.h"
+#include "file_type.h"
+
+enum futil_file_type ft_recognize_bdb(uint8_t *buf, uint32_t len)
+{
+	const struct bdb_header *header = bdb_get_header(buf);
+
+	if (bdb_check_header(header, len))
+		return FILE_TYPE_UNKNOWN;
+
+	return FILE_TYPE_BDB;
+}
+
+static void print_digest(const char *label, const uint8_t *digest, size_t size)
+{
+	int i;
+
+	if (label)
+		printf("%s", label);
+	for (i = 0; i < size; i++)
+		printf("%02x", digest[i]);
+	printf("\n");
+}
+
+static void show_bdb_header(const uint8_t *bdb)
+{
+	const struct bdb_header *header = bdb_get_header(bdb);
+	const struct bdb_key *key = bdb_get_bdbkey(bdb);
+	uint8_t digest[BDB_SHA256_DIGEST_SIZE];
+
+	printf("BDB Header:\n");
+	printf("  Struct Version: 0x%x:0x%x\n",
+	       header->struct_major_version, header->struct_minor_version);
+
+	bdb_sha256(digest, key, key->struct_size);
+	print_digest("  BDB key digest: ", digest, sizeof(digest));
+	printf("            size: %d\n", key->struct_size);
+}
+
+
+int ft_show_bdb(const char *name, uint8_t *buf, uint32_t len, void *data)
+{
+	const struct bdb_header *header = bdb_get_header(buf);
+	int rv;
+
+	/* We can get here because of '--type' option */
+	rv  = bdb_check_header(header, len);
+	if (rv) {
+		fprintf(stderr, "ERROR: Invalid BDB blob: %d\n", rv);
+		return 1;
+	}
+
+	printf("Boot Descriptor Block: %s\n", name);
+	show_bdb_header(buf);
+
+	return 0;
+}

futility/cmd_show.c

@@ -399,6 +399,7 @@ static const char usage[] = "\n"
 	"\n"
 	"Where FILE could be\n"
 	"\n"
+	"  a BDB\n"
 	"  a keyblock (.keyblock)\n"
 	"  a firmware preamble signature (VBLOCK_A/B)\n"
 	"  a firmware image (bios.bin)\n"

futility/file_type.inc

@@ -80,3 +80,7 @@ FILE_TYPE(USBPD1,           "usbpd1",        "USB-PD charger image (v1.0)",
 	  R_(ft_recognize_usbpd1),
 	  S_(ft_show_usbpd1),
 	  S_(ft_sign_usbpd1))
+FILE_TYPE(BDB,           "bdb",        "Common Boot Flow Boot Descriptor Block",
+	  R_(ft_recognize_bdb),
+	  S_(ft_show_bdb),
+	  NONE)

tests/futility/test_file_types.c

@@ -37,6 +37,7 @@ static struct {
 	{FILE_TYPE_VB2_PRIVKEY,     "tests/futility/data/sample.vbprik2"},
 	{FILE_TYPE_PEM,             "tests/testkeys/key_rsa2048.pem"},
 	{FILE_TYPE_USBPD1,          "tests/futility/data/zinger_mp_image.bin"},
+	{FILE_TYPE_BDB,             "tests/futility/data/bdb.bin"},
 	{FILE_TYPE_RWSIG,           },		/* need a test for this */
 };
 BUILD_ASSERT(ARRAY_SIZE(test_case) == NUM_FILE_TYPES);

tests/futility/test_file_types.sh

@@ -44,6 +44,7 @@ test_case "pubkey21"        "tests/futility/data/sample.vbpubk2"
 test_case "prikey21"        "tests/futility/data/sample.vbprik2"
 test_case "pem"             "tests/testkeys/key_rsa2048.pem"
 test_case "pem"             "tests/testkeys/key_rsa8192.pub.pem"
+test_case "bdb"             "tests/futility/data/bdb.bin"
 
 # Expect failure here.
 fail_case "/Sir/Not/Appearing/In/This/Film"