/* 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 firmware image library.
*/
#include <stdio.h>
#include "2sysincludes.h"
#include "2rsa.h"
#include "file_keys.h"
#include "host_common.h"
#include "host_key.h"
#include "host_keyblock.h"
#include "host_signature.h"
#include "vb2_common.h"
#include "vboot_common.h"
#include "test_common.h"
static void resign_keyblock(struct vb2_keyblock *h, const VbPrivateKey *key)
{
VbSignature *sig =
CalculateSignature((const uint8_t *)h,
h->keyblock_signature.data_size, key);
SignatureCopy((VbSignature *)&h->keyblock_signature, sig);
free(sig);
}
static void test_verify_keyblock(const VbPublicKey *public_key,
const VbPrivateKey *private_key,
const VbPublicKey *data_key)
{
uint8_t workbuf[VB2_KEY_BLOCK_VERIFY_WORKBUF_BYTES]
__attribute__ ((aligned (VB2_WORKBUF_ALIGN)));
struct vb2_workbuf wb;
struct vb2_public_key key;
struct vb2_keyblock *hdr;
struct vb2_keyblock *h;
uint32_t hsize;
vb2_workbuf_init(&wb, workbuf, sizeof(workbuf));
/* Unpack public key */
TEST_SUCC(vb2_unpack_key(&key, (uint8_t *)public_key,
public_key->key_offset + public_key->key_size),
"vb2_verify_keyblock public key");
hdr = (struct vb2_keyblock *)
KeyBlockCreate(data_key, private_key, 0x1234);
TEST_NEQ((size_t)hdr, 0, "vb2_verify_keyblock() prerequisites");
if (!hdr)
return;
hsize = hdr->keyblock_size;
h = (struct vb2_keyblock *)malloc(hsize + 2048);
Memcpy(h, hdr, hsize);
TEST_SUCC(vb2_verify_keyblock(h, hsize, &key, &wb),
"vb2_verify_keyblock() ok using key");
Memcpy(h, hdr, hsize);
TEST_EQ(vb2_verify_keyblock(h, hsize - 1, &key, &wb),
VB2_ERROR_KEYBLOCK_SIZE, "vb2_verify_keyblock() size--");
/* Buffer is allowed to be bigger than keyblock */
Memcpy(h, hdr, hsize);
TEST_SUCC(vb2_verify_keyblock(h, hsize + 1, &key, &wb),
"vb2_verify_keyblock() size++");
Memcpy(h, hdr, hsize);
h->magic[0] &= 0x12;
TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
VB2_ERROR_KEYBLOCK_MAGIC, "vb2_verify_keyblock() magic");
/* Care about major version but not minor */
Memcpy(h, hdr, hsize);
h->header_version_major++;
resign_keyblock(h, private_key);
TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
VB2_ERROR_KEYBLOCK_HEADER_VERSION,
"vb2_verify_keyblock() major++");
Memcpy(h, hdr, hsize);
h->header_version_major--;
resign_keyblock(h, private_key);
TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
VB2_ERROR_KEYBLOCK_HEADER_VERSION,
"vb2_verify_keyblock() major--");
Memcpy(h, hdr, hsize);
h->header_version_minor++;
resign_keyblock(h, private_key);
TEST_SUCC(vb2_verify_keyblock(h, hsize, &key, &wb),
"vb2_verify_keyblock() minor++");
Memcpy(h, hdr, hsize);
h->header_version_minor--;
resign_keyblock(h, private_key);
TEST_SUCC(vb2_verify_keyblock(h, hsize, &key, &wb),
"vb2_verify_keyblock() minor--");
/* Check signature */
Memcpy(h, hdr, hsize);
h->keyblock_signature.sig_offset = hsize;
resign_keyblock(h, private_key);
TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
VB2_ERROR_KEYBLOCK_SIG_OUTSIDE,
"vb2_verify_keyblock() sig off end");
Memcpy(h, hdr, hsize);
h->keyblock_signature.sig_size--;
resign_keyblock(h, private_key);
TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
VB2_ERROR_KEYBLOCK_SIG_INVALID,
"vb2_verify_keyblock() sig too small");
Memcpy(h, hdr, hsize);
((uint8_t *)vb2_packed_key_data(&h->data_key))[0] ^= 0x34;
TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
VB2_ERROR_KEYBLOCK_SIG_INVALID,
"vb2_verify_keyblock() sig mismatch");
Memcpy(h, hdr, hsize);
h->keyblock_signature.data_size = h->keyblock_size + 1;
TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
VB2_ERROR_KEYBLOCK_SIGNED_TOO_MUCH,
"vb2_verify_keyblock() sig data past end of block");
/* Check that we signed header and data key */
Memcpy(h, hdr, hsize);
h->keyblock_signature.data_size = 4;
h->data_key.key_offset = 0;
h->data_key.key_size = 0;
resign_keyblock(h, private_key);
TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
VB2_ERROR_KEYBLOCK_SIGNED_TOO_LITTLE,
"vb2_verify_keyblock() didn't sign header");
Memcpy(h, hdr, hsize);
h->data_key.key_offset = hsize;
resign_keyblock(h, private_key);
TEST_EQ(vb2_verify_keyblock(h, hsize, &key, &wb),
VB2_ERROR_KEYBLOCK_DATA_KEY_OUTSIDE,
"vb2_verify_keyblock() data key off end");
/* Corner cases for error checking */
TEST_EQ(vb2_verify_keyblock(NULL, 4, &key, &wb),
VB2_ERROR_KEYBLOCK_TOO_SMALL_FOR_HEADER,
"vb2_verify_keyblock 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);
}
static void resign_fw_preamble(struct vb2_fw_preamble *h,
const VbPrivateKey *key)
{
VbSignature *sig = CalculateSignature(
(const uint8_t *)h, h->preamble_signature.data_size, key);
SignatureCopy((VbSignature *)&h->preamble_signature, sig);
free(sig);
}
static void test_verify_fw_preamble(const VbPublicKey *public_key,
const VbPrivateKey *private_key,
const VbPublicKey *kernel_subkey)
{
struct vb2_fw_preamble *hdr;
struct vb2_fw_preamble *h;
struct vb2_public_key rsa;
uint8_t workbuf[VB2_VERIFY_FIRMWARE_PREAMBLE_WORKBUF_BYTES]
__attribute__ ((aligned (VB2_WORKBUF_ALIGN)));
struct vb2_workbuf wb;
uint32_t hsize;
vb2_workbuf_init(&wb, workbuf, sizeof(workbuf));
/* Create a dummy signature */
VbSignature *body_sig = SignatureAlloc(56, 78);
TEST_SUCC(vb2_unpack_key(&rsa, (uint8_t *)public_key,
public_key->key_offset + public_key->key_size),
"vb2_verify_fw_preamble() prereq key");
hdr = (struct vb2_fw_preamble *)
CreateFirmwarePreamble(0x1234, kernel_subkey, body_sig,
private_key, 0x5678);
TEST_PTR_NEQ(hdr, NULL,
"VerifyFirmwarePreamble() prereq test preamble");
if (!hdr)
return;
hsize = (uint32_t) hdr->preamble_size;
h = (struct vb2_fw_preamble *)malloc(hsize + 16384);
Memcpy(h, hdr, hsize);
TEST_SUCC(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
"vb2_verify_fw_preamble() ok using key");
Memcpy(h, hdr, hsize);
TEST_EQ(vb2_verify_fw_preamble(h, 4, &rsa, &wb),
VB2_ERROR_PREAMBLE_TOO_SMALL_FOR_HEADER,
"vb2_verify_fw_preamble() size tiny");
Memcpy(h, hdr, hsize);
TEST_EQ(vb2_verify_fw_preamble(h, hsize - 1, &rsa, &wb),
VB2_ERROR_PREAMBLE_SIZE,
"vb2_verify_fw_preamble() size--");
/* Buffer is allowed to be bigger than preamble */
Memcpy(h, hdr, hsize);
TEST_SUCC(vb2_verify_fw_preamble(h, hsize + 1, &rsa, &wb),
"vb2_verify_fw_preamble() size++");
/* Care about major version but not minor */
Memcpy(h, hdr, hsize);
h->header_version_major++;
resign_fw_preamble(h, private_key);
TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
VB2_ERROR_PREAMBLE_HEADER_VERSION
, "vb2_verify_fw_preamble() major++");
Memcpy(h, hdr, hsize);
h->header_version_major--;
resign_fw_preamble(h, private_key);
TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
VB2_ERROR_PREAMBLE_HEADER_VERSION,
"vb2_verify_fw_preamble() major--");
Memcpy(h, hdr, hsize);
h->header_version_minor++;
resign_fw_preamble(h, private_key);
TEST_SUCC(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
"vb2_verify_fw_preamble() minor++");
Memcpy(h, hdr, hsize);
h->header_version_minor--;
resign_fw_preamble(h, private_key);
TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
VB2_ERROR_PREAMBLE_HEADER_OLD,
"vb2_verify_fw_preamble() 2.0 not supported");
/* Check signature */
Memcpy(h, hdr, hsize);
h->preamble_signature.sig_offset = hsize;
resign_fw_preamble(h, private_key);
TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
VB2_ERROR_PREAMBLE_SIG_OUTSIDE,
"vb2_verify_fw_preamble() sig off end");
Memcpy(h, hdr, hsize);
h->preamble_signature.sig_size--;
resign_fw_preamble(h, private_key);
TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
VB2_ERROR_PREAMBLE_SIG_INVALID,
"vb2_verify_fw_preamble() sig too small");
Memcpy(h, hdr, hsize);
((uint8_t *)vb2_packed_key_data(&h->kernel_subkey))[0] ^= 0x34;
TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
VB2_ERROR_PREAMBLE_SIG_INVALID,
"vb2_verify_fw_preamble() sig mismatch");
/* Check that we signed header, kernel subkey, and body sig */
Memcpy(h, hdr, hsize);
h->preamble_signature.data_size = 4;
h->kernel_subkey.key_offset = 0;
h->kernel_subkey.key_size = 0;
h->body_signature.sig_offset = 0;
h->body_signature.sig_size = 0;
resign_fw_preamble(h, private_key);
TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
VB2_ERROR_PREAMBLE_SIGNED_TOO_LITTLE,
"vb2_verify_fw_preamble() didn't sign header");
Memcpy(h, hdr, hsize);
h->kernel_subkey.key_offset = hsize;
resign_fw_preamble(h, private_key);
TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
VB2_ERROR_PREAMBLE_KERNEL_SUBKEY_OUTSIDE,
"vb2_verify_fw_preamble() kernel subkey off end");
Memcpy(h, hdr, hsize);
h->body_signature.sig_offset = hsize;
resign_fw_preamble(h, private_key);
TEST_EQ(vb2_verify_fw_preamble(h, hsize, &rsa, &wb),
VB2_ERROR_PREAMBLE_BODY_SIG_OUTSIDE,
"vb2_verify_fw_preamble() body sig off end");
/* TODO: verify with extra padding at end of header. */
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;
VbPrivateKey *signing_private_key = NULL;
VbPublicKey *signing_public_key = NULL;
VbPublicKey *data_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]);
sprintf(filename, "%s/key_rsa%d.pem", keys_dir, signing_rsa_len);
signing_private_key = PrivateKeyReadPem(filename,
signing_key_algorithm);
if (!signing_private_key) {
fprintf(stderr, "Error reading signing_private_key: %s\n",
filename);
return 1;
}
sprintf(filename, "%s/key_rsa%d.keyb", keys_dir, signing_rsa_len);
signing_public_key = PublicKeyReadKeyb(filename,
signing_key_algorithm, 1);
if (!signing_public_key) {
fprintf(stderr, "Error reading signing_public_key: %s\n",
filename);
return 1;
}
sprintf(filename, "%s/key_rsa%d.keyb", keys_dir, data_rsa_len);
data_public_key = PublicKeyReadKeyb(filename,
data_key_algorithm, 1);
if (!data_public_key) {
fprintf(stderr, "Error reading data_public_key: %s\n",
filename);
return 1;
}
test_verify_keyblock(signing_public_key, signing_private_key,
data_public_key);
test_verify_fw_preamble(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 */
const struct test_perm test_perms[] = {
{VB2_ALG_RSA4096_SHA256, VB2_ALG_RSA2048_SHA256},
{VB2_ALG_RSA8192_SHA512, VB2_ALG_RSA2048_SHA256},
{VB2_ALG_RSA8192_SHA512, VB2_ALG_RSA4096_SHA256},
};
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 < VB2_ALG_COUNT; sign_alg++) {
for (data_alg = 0; data_alg < VB2_ALG_COUNT;
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;
}
return gTestSuccess ? 0 : 255;
}