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/* Copyright (c) 2013 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 firmware image library.
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "2sysincludes.h"
#include "2common.h"
#include "2sha.h"
#include "cryptolib.h"
#include "file_keys.h"
#include "host_common.h"
#include "test_common.h"
#include "vboot_common.h"
static void ReChecksumKeyBlock(VbKeyBlockHeader *h)
{
vb2_digest_buffer((const uint8_t *)h,
h->key_block_checksum.data_size,
VB2_HASH_SHA512,
GetSignatureData(&h->key_block_checksum),
VB2_SHA512_DIGEST_SIZE);
}
static void KeyBlockVerifyTest(const VbPublicKey *public_key,
const struct vb2_private_key *private_key,
const struct vb2_packed_key *data_key)
{
VbKeyBlockHeader *hdr;
VbKeyBlockHeader *h;
unsigned hsize;
hdr = (VbKeyBlockHeader *)
vb2_create_keyblock((struct vb2_packed_key *)data_key,
private_key,
0x1234);
TEST_NEQ((size_t)hdr, 0, "KeyBlockVerify() prerequisites");
if (!hdr)
return;
hsize = (unsigned) hdr->key_block_size;
h = (VbKeyBlockHeader *)malloc(hsize + 1024);
TEST_EQ(KeyBlockVerify(hdr, hsize, NULL, 1), 0,
"KeyBlockVerify() ok using checksum");
TEST_EQ(KeyBlockVerify(hdr, hsize, public_key, 0), 0,
"KeyBlockVerify() ok using key");
TEST_NEQ(KeyBlockVerify(hdr, hsize, NULL, 0), 0,
"KeyBlockVerify() missing key");
TEST_NEQ(KeyBlockVerify(hdr, hsize - 1, NULL, 1), 0,
"KeyBlockVerify() size--");
TEST_EQ(KeyBlockVerify(hdr, hsize + 1, NULL, 1), 0,
"KeyBlockVerify() size++");
Memcpy(h, hdr, hsize);
h->magic[0] &= 0x12;
TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
"KeyBlockVerify() magic");
/* Care about major version but not minor */
Memcpy(h, hdr, hsize);
h->header_version_major++;
ReChecksumKeyBlock(h);
TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
"KeyBlockVerify() major++");
Memcpy(h, hdr, hsize);
h->header_version_major--;
ReChecksumKeyBlock(h);
TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
"KeyBlockVerify() major--");
Memcpy(h, hdr, hsize);
h->header_version_minor++;
ReChecksumKeyBlock(h);
TEST_EQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
"KeyBlockVerify() minor++");
Memcpy(h, hdr, hsize);
h->header_version_minor--;
ReChecksumKeyBlock(h);
TEST_EQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
"KeyBlockVerify() minor--");
/* Check hash */
Memcpy(h, hdr, hsize);
h->key_block_checksum.sig_offset = hsize;
ReChecksumKeyBlock(h);
TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
"KeyBlockVerify() checksum off end");
Memcpy(h, hdr, hsize);
h->key_block_checksum.sig_size /= 2;
ReChecksumKeyBlock(h);
TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
"KeyBlockVerify() checksum too small");
Memcpy(h, hdr, hsize);
GetPublicKeyData(&h->data_key)[0] ^= 0x34;
TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
"KeyBlockVerify() checksum mismatch");
/* Check signature */
Memcpy(h, hdr, hsize);
h->key_block_signature.sig_offset = hsize;
ReChecksumKeyBlock(h);
TEST_NEQ(KeyBlockVerify(h, hsize, public_key, 0), 0,
"KeyBlockVerify() sig off end");
Memcpy(h, hdr, hsize);
h->key_block_signature.sig_size--;
ReChecksumKeyBlock(h);
TEST_NEQ(KeyBlockVerify(h, hsize, public_key, 0), 0,
"KeyBlockVerify() sig too small");
Memcpy(h, hdr, hsize);
GetPublicKeyData(&h->data_key)[0] ^= 0x34;
TEST_NEQ(KeyBlockVerify(h, hsize, public_key, 0), 0,
"KeyBlockVerify() sig mismatch");
Memcpy(h, hdr, hsize);
h->key_block_checksum.data_size = h->key_block_size + 1;
TEST_NEQ(KeyBlockVerify(h, hsize, public_key, 1), 0,
"KeyBlockVerify() checksum data past end of block");
/* Check that we signed header and data key */
Memcpy(h, hdr, hsize);
h->key_block_checksum.data_size = 4;
h->data_key.key_offset = 0;
h->data_key.key_size = 0;
ReChecksumKeyBlock(h);
TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
"KeyBlockVerify() didn't sign header");
Memcpy(h, hdr, hsize);
h->data_key.key_offset = hsize;
ReChecksumKeyBlock(h);
TEST_NEQ(KeyBlockVerify(h, hsize, NULL, 1), 0,
"KeyBlockVerify() data key off end");
/* Corner cases for error checking */
TEST_NEQ(KeyBlockVerify(NULL, 4, NULL, 1), 0,
"KeyBlockVerify size too small");
/*
* TODO: verify parser can support a bigger header (i.e., one where
* data_key.key_offset is bigger than expected).
*/
free(h);
free(hdr);
}
int test_permutation(int signing_key_algorithm, int data_key_algorithm,
const char *keys_dir)
{
char filename[1024];
int signing_rsa_len = siglen_map[signing_key_algorithm] * 8;
int data_rsa_len = siglen_map[data_key_algorithm] * 8;
VbPublicKey *signing_public_key = NULL;
printf("***Testing signing algorithm: %s\n",
algo_strings[signing_key_algorithm]);
printf("***With data key algorithm: %s\n",
algo_strings[data_key_algorithm]);
snprintf(filename, sizeof(filename),
"%s/key_rsa%d.pem", keys_dir, signing_rsa_len);
struct vb2_private_key *signing_private_key =
vb2_read_private_key_pem(filename, signing_key_algorithm);
if (!signing_private_key) {
fprintf(stderr, "Error reading signing_private_key: %s\n",
filename);
return 1;
}
snprintf(filename, sizeof(filename),
"%s/key_rsa%d.keyb", keys_dir, signing_rsa_len);
signing_public_key = (VbPublicKey *)
vb2_read_packed_keyb(filename, signing_key_algorithm, 1);
if (!signing_public_key) {
fprintf(stderr, "Error reading signing_public_key: %s\n",
filename);
return 1;
}
snprintf(filename, sizeof(filename),
"%s/key_rsa%d.keyb", keys_dir, data_rsa_len);
struct vb2_packed_key *data_public_key =
vb2_read_packed_keyb(filename, data_key_algorithm, 1);
if (!data_public_key) {
fprintf(stderr, "Error reading data_public_key: %s\n",
filename);
return 1;
}
KeyBlockVerifyTest(signing_public_key, signing_private_key,
data_public_key);
if (signing_public_key)
free(signing_public_key);
if (signing_private_key)
free(signing_private_key);
if (data_public_key)
free(data_public_key);
return 0;
}
struct test_perm
{
int signing_algorithm;
int data_key_algorithm;
};
/*
* Permutations of signing and data key algorithms in active use:
* 7 (rsa4096 sha256) - 4 (rsa2048 sha256)
* 11 (rsa8192 sha512) - 4 (rsa2048 sha256)
* 11 (rsa8192 sha512) - 7 (rsa4096 sha256)
*/
const struct test_perm test_perms[] = {{7, 4}, {11, 4}, {11, 7}};
int main(int argc, char *argv[])
{
if (argc == 2) {
/* Test only the algorithms we use */
int i;
for (i = 0; i < ARRAY_SIZE(test_perms); i++) {
if (test_permutation(test_perms[i].signing_algorithm,
test_perms[i].data_key_algorithm,
argv[1]))
return 1;
}
} else if (argc == 3 && !strcasecmp(argv[2], "--all")) {
/* Test all the algorithms */
int sign_alg, data_alg;
for (sign_alg = 0; sign_alg < kNumAlgorithms; sign_alg++) {
for (data_alg = 0; data_alg < kNumAlgorithms;
data_alg++) {
if (test_permutation(sign_alg, data_alg,
argv[1]))
return 1;
}
}
} else {
fprintf(stderr, "Usage: %s <keys_dir> [--all]", argv[0]);
return -1;
}
if (vboot_api_stub_check_memory())
return 255;
return gTestSuccess ? 0 : 255;
}
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