tests/vb2_api2_tests.c

/* Copyright (c) 2014 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.
 *
 * Tests for api library, new style structs
 */

#include <stdio.h>

#include "2sysincludes.h"
#include "2api.h"
#include "2common.h"
#include "2misc.h"
#include "2nvstorage.h"
#include "2rsa.h"
#include "2secdata.h"

#include "host_signature2.h"

#include "test_common.h"
#include "vb2_convert_structs.h"

/* Common context for tests */
static uint8_t workbuf[VB2_WORKBUF_RECOMMENDED_SIZE]
	__attribute__ ((aligned (16)));
static struct vb2_context ctx;
static struct vb2_shared_data *sd;

static const uint8_t mock_body[320] = "Mock body";
static const int mock_body_size = sizeof(mock_body);
static const int mock_algorithm = VB2_ALG_RSA2048_SHA256;
static const int mock_hash_alg = VB2_HASH_SHA256;
static int mock_sig_size;

static const struct vb2_guid test_guid[4] = {
	{.raw = {0x11}},
	{.raw = {0x22}},
	{.raw = {0x33}},
	{.raw = {0x44}},
};

/* Mocked function data */
static int retval_vb2_load_fw_keyblock;
static int retval_vb2_load_fw_preamble;

/* Type of test to reset for */
enum reset_type {
	FOR_MISC,
	FOR_EXTEND_HASH,
	FOR_CHECK_HASH,
};

static void reset_common_data(enum reset_type t)
{
	struct vb2_fw_preamble2 *pre;
	struct vb2_signature2 *sig;
	uint32_t sig_offset;

	int i;

	memset(workbuf, 0xaa, sizeof(workbuf));

	memset(&ctx, 0, sizeof(ctx));
	ctx.workbuf = workbuf;
	ctx.workbuf_size = sizeof(workbuf);

	vb2_init_context(&ctx);
	sd = vb2_get_sd(&ctx);

	vb2_nv_init(&ctx);

	vb2_secdata_create(&ctx);
	vb2_secdata_init(&ctx);

	retval_vb2_load_fw_keyblock = VB2_SUCCESS;
	retval_vb2_load_fw_preamble = VB2_SUCCESS;

	sd->workbuf_preamble_offset = ctx.workbuf_used;
	pre = (struct vb2_fw_preamble2 *)
		(ctx.workbuf + sd->workbuf_preamble_offset);
	pre->hash_count = 3;
	pre->hash_offset = sig_offset = sizeof(*pre);

	for (i = 0; i < 3; i++) {
		sig = vb2_create_hash_sig(mock_body,
					  mock_body_size - 16 * i,
					  mock_hash_alg);
		memcpy(&sig->guid, test_guid + i, sizeof(sig->guid));
		memcpy((uint8_t *)pre + sig_offset, sig, sig->c.total_size);
		sig_offset += sig->c.total_size;
		mock_sig_size = sig->c.total_size;
		free(sig);
	}

	sd->workbuf_preamble_size = sig_offset;
	ctx.workbuf_used = sd->workbuf_preamble_offset
		+ sd->workbuf_preamble_size;

	if (t == FOR_EXTEND_HASH || t == FOR_CHECK_HASH)
		vb2api_init_hash2(&ctx, test_guid, NULL);

	if (t == FOR_CHECK_HASH)
		vb2api_extend_hash(&ctx, mock_body, mock_body_size);
};

/* Mocked functions */

int vb2_load_fw_keyblock2(struct vb2_context *ctx)
{
	return retval_vb2_load_fw_keyblock;
}

int vb2_load_fw_preamble2(struct vb2_context *ctx)
{
	return retval_vb2_load_fw_preamble;
}

/* Tests */

static void phase3_tests(void)
{
	reset_common_data(FOR_MISC);
	TEST_SUCC(vb2api_fw_phase3_2(&ctx), "phase3 good");

	reset_common_data(FOR_MISC);
	retval_vb2_load_fw_keyblock = VB2_ERROR_MOCK;
	TEST_EQ(vb2api_fw_phase3_2(&ctx), VB2_ERROR_MOCK, "phase3 keyblock");
	TEST_EQ(vb2_nv_get(&ctx, VB2_NV_RECOVERY_REQUEST),
		VB2_RECOVERY_RO_INVALID_RW, "  recovery reason");

	reset_common_data(FOR_MISC);
	retval_vb2_load_fw_preamble = VB2_ERROR_MOCK;
	TEST_EQ(vb2api_fw_phase3_2(&ctx), VB2_ERROR_MOCK, "phase3 keyblock");
	TEST_EQ(vb2_nv_get(&ctx, VB2_NV_RECOVERY_REQUEST),
		VB2_RECOVERY_RO_INVALID_RW, "  recovery reason");
}

static void init_hash_tests(void)
{
	struct vb2_fw_preamble2 *pre;
	struct vb2_signature2 *sig;
	int wb_used_before;
	uint32_t size;

	reset_common_data(FOR_MISC);
	pre = (struct vb2_fw_preamble2 *)
		(ctx.workbuf + sd->workbuf_preamble_offset);
	sig = (struct vb2_signature2 *)((uint8_t *)pre + pre->hash_offset);

	wb_used_before = ctx.workbuf_used;
	TEST_SUCC(vb2api_init_hash2(&ctx, test_guid, &size),
		  "init hash good");
	TEST_EQ(sd->workbuf_hash_offset,
		(wb_used_before + (VB2_WORKBUF_ALIGN - 1)) &
		~(VB2_WORKBUF_ALIGN - 1),
		"hash context offset");
	TEST_EQ(sd->workbuf_hash_size, sizeof(struct vb2_digest_context),
		"hash context size");
	TEST_EQ(ctx.workbuf_used,
		sd->workbuf_hash_offset + sd->workbuf_hash_size,
		"hash uses workbuf");
	TEST_EQ(sd->hash_tag,
		sd->workbuf_preamble_offset + pre->hash_offset,
		"hash signature offset");
	TEST_EQ(sd->hash_remaining_size, mock_body_size, "hash remaining");

	wb_used_before = ctx.workbuf_used;
	TEST_SUCC(vb2api_init_hash2(&ctx, test_guid + 2, NULL),
		  "init hash again");
	TEST_EQ(ctx.workbuf_used, wb_used_before, "init hash reuses context");
	TEST_EQ(sd->hash_tag,
		sd->workbuf_preamble_offset + pre->hash_offset +
		2 * mock_sig_size,
		"hash signature offset 2");

	reset_common_data(FOR_MISC);
	TEST_EQ(vb2api_init_hash2(&ctx, test_guid + 3, &size),
		VB2_ERROR_API_INIT_HASH_GUID, "init hash invalid guid");

	reset_common_data(FOR_MISC);
	sd->workbuf_preamble_size = 0;
	TEST_EQ(vb2api_init_hash2(&ctx, test_guid, &size),
		VB2_ERROR_API_INIT_HASH_PREAMBLE, "init hash preamble");

	reset_common_data(FOR_MISC);
	ctx.workbuf_used =
		ctx.workbuf_size - sizeof(struct vb2_digest_context) + 8;
	TEST_EQ(vb2api_init_hash2(&ctx, test_guid, &size),
		VB2_ERROR_API_INIT_HASH_WORKBUF, "init hash workbuf");

	reset_common_data(FOR_MISC);
	sig->hash_alg = VB2_HASH_INVALID;
	TEST_EQ(vb2api_init_hash2(&ctx, test_guid, &size),
		VB2_ERROR_SHA_INIT_ALGORITHM, "init hash algorithm");
}

static void check_hash_tests(void)
{
	struct vb2_fw_preamble2 *pre;
	struct vb2_signature2 *sig;
	struct vb2_digest_context *dc;

	reset_common_data(FOR_CHECK_HASH);
	pre = (struct vb2_fw_preamble2 *)
		(ctx.workbuf + sd->workbuf_preamble_offset);
	sig = (struct vb2_signature2 *)((uint8_t *)pre + pre->hash_offset);
	dc = (struct vb2_digest_context *)
		(ctx.workbuf + sd->workbuf_hash_offset);

	TEST_SUCC(vb2api_check_hash2(&ctx), "check hash good");

	reset_common_data(FOR_CHECK_HASH);
	sd->hash_tag = 0;
	TEST_EQ(vb2api_check_hash2(&ctx),
		VB2_ERROR_API_CHECK_HASH_TAG, "check hash tag");

	reset_common_data(FOR_CHECK_HASH);
	sd->workbuf_hash_size = 0;
	TEST_EQ(vb2api_check_hash2(&ctx),
		VB2_ERROR_API_CHECK_HASH_WORKBUF, "check hash no workbuf");

	reset_common_data(FOR_CHECK_HASH);
	sd->hash_remaining_size = 1;
	TEST_EQ(vb2api_check_hash2(&ctx),
		VB2_ERROR_API_CHECK_HASH_SIZE, "check hash size");

	reset_common_data(FOR_CHECK_HASH);
	ctx.workbuf_used = ctx.workbuf_size;
	TEST_EQ(vb2api_check_hash2(&ctx),
		VB2_ERROR_API_CHECK_HASH_WORKBUF_DIGEST, "check hash workbuf");

	reset_common_data(FOR_CHECK_HASH);
	dc->hash_alg = VB2_HASH_INVALID;
	*((uint8_t *)sig + sig->sig_offset) ^= 0x55;
	TEST_EQ(vb2api_check_hash2(&ctx),
		VB2_ERROR_SHA_FINALIZE_ALGORITHM, "check hash finalize");

	reset_common_data(FOR_CHECK_HASH);
	*((uint8_t *)sig + sig->sig_offset) ^= 0x55;
	TEST_EQ(vb2api_check_hash2(&ctx),
		VB2_ERROR_API_CHECK_HASH_SIG, "check hash sig");
}

int main(int argc, char* argv[])
{
	phase3_tests();
	init_hash_tests();
	check_hash_tests();

	return gTestSuccess ? 0 : 255;
}