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/* Copyright (c) 2011 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 <stdlib.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) {
uint8_t* newchk = DigestBuf((const uint8_t*)h,
h->key_block_checksum.data_size,
SHA512_DIGEST_ALGORITHM);
Memcpy(GetSignatureData(&h->key_block_checksum), newchk, SHA512_DIGEST_SIZE);
free(newchk);
}
static void KeyBlockVerifyTest(const VbPublicKey* public_key,
const VbPrivateKey* private_key,
const VbPublicKey* data_key) {
VbKeyBlockHeader *hdr;
VbKeyBlockHeader *h;
unsigned hsize;
hdr = KeyBlockCreate(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");
/* 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");
/* 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 ReSignFirmwarePreamble(VbFirmwarePreambleHeader* h,
const VbPrivateKey* key) {
VbSignature *sig = CalculateSignature((const uint8_t*)h,
h->preamble_signature.data_size, key);
SignatureCopy(&h->preamble_signature, sig);
free(sig);
}
static void VerifyFirmwarePreambleTest(const VbPublicKey* public_key,
const VbPrivateKey* private_key,
const VbPublicKey* kernel_subkey) {
VbFirmwarePreambleHeader* hdr;
VbFirmwarePreambleHeader* h;
RSAPublicKey* rsa;
unsigned hsize;
/* Create a dummy signature */
VbSignature* body_sig = SignatureAlloc(56, 78);
rsa = PublicKeyToRSA(public_key);
hdr = CreateFirmwarePreamble(0x1234, kernel_subkey, body_sig, private_key,
0x5678);
TEST_NEQ(hdr && rsa, 0, "VerifyFirmwarePreamble() prerequisites");
if (!hdr)
return;
hsize = (unsigned) hdr->preamble_size;
h = (VbFirmwarePreambleHeader*)malloc(hsize + 16384);
TEST_EQ(VerifyFirmwarePreamble(hdr, hsize, rsa), 0,
"VerifyFirmwarePreamble() ok using key");
TEST_NEQ(VerifyFirmwarePreamble(hdr, hsize - 1, rsa), 0,
"VerifyFirmwarePreamble() size--");
TEST_EQ(VerifyFirmwarePreamble(hdr, hsize + 1, rsa), 0,
"VerifyFirmwarePreamble() size++");
/* Care about major version but not minor */
Memcpy(h, hdr, hsize);
h->header_version_major++;
ReSignFirmwarePreamble(h, private_key);
TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
"VerifyFirmwarePreamble() major++");
Memcpy(h, hdr, hsize);
h->header_version_major--;
ReSignFirmwarePreamble(h, private_key);
TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
"VerifyFirmwarePreamble() major--");
Memcpy(h, hdr, hsize);
h->header_version_minor++;
ReSignFirmwarePreamble(h, private_key);
TEST_EQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
"VerifyFirmwarePreamble() minor++");
Memcpy(h, hdr, hsize);
h->header_version_minor--;
ReSignFirmwarePreamble(h, private_key);
TEST_EQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
"VerifyFirmwarePreamble() minor--");
/* Check signature */
Memcpy(h, hdr, hsize);
h->preamble_signature.sig_offset = hsize;
ReSignFirmwarePreamble(h, private_key);
TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
"VerifyFirmwarePreamble() sig off end");
Memcpy(h, hdr, hsize);
h->preamble_signature.sig_size--;
ReSignFirmwarePreamble(h, private_key);
TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
"VerifyFirmwarePreamble() sig too small");
Memcpy(h, hdr, hsize);
GetPublicKeyData(&h->kernel_subkey)[0] ^= 0x34;
TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
"VerifyFirmwarePreamble() 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;
ReSignFirmwarePreamble(h, private_key);
TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
"VerifyFirmwarePreamble() didn't sign header");
Memcpy(h, hdr, hsize);
h->kernel_subkey.key_offset = hsize;
ReSignFirmwarePreamble(h, private_key);
TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
"VerifyFirmwarePreamble() kernel subkey off end");
Memcpy(h, hdr, hsize);
h->body_signature.sig_offset = hsize;
ReSignFirmwarePreamble(h, private_key);
TEST_NEQ(VerifyFirmwarePreamble(h, hsize, rsa), 0,
"VerifyFirmwarePreamble() body sig off end");
/* Check that we return flags properly for new and old structs */
Memcpy(h, hdr, hsize);
TEST_EQ(VbGetFirmwarePreambleFlags(h), 0x5678,
"VbGetFirmwarePreambleFlags() v2.1");
h->header_version_minor = 0;
TEST_EQ(VbGetFirmwarePreambleFlags(h), 0,
"VbGetFirmwarePreambleFlags() v2.0");
/* TODO: verify with extra padding at end of header. */
free(h);
RSAPublicKeyFree(rsa);
free(hdr);
}
int main(int argc, char* argv[]) {
VbPrivateKey* signing_private_key = NULL;
VbPublicKey* signing_public_key = NULL;
int signing_key_algorithm;
VbPublicKey* data_public_key = NULL;
int data_key_algorithm;
int error_code = 0;
if(argc != 7) {
fprintf(stderr, "Usage: %s <signing_key_algorithm> <data_key_algorithm>"
" <signing key> <processed signing pubkey>"
" <data key> <processed data pubkey>\n", argv[0]);
return -1;
}
/* Read verification keys and create a test image. */
signing_key_algorithm = atoi(argv[1]);
data_key_algorithm = atoi(argv[2]);
signing_private_key = PrivateKeyReadPem(argv[3], signing_key_algorithm);
if (!signing_private_key) {
fprintf(stderr, "Error reading signing_private_key");
return 1;
}
signing_public_key = PublicKeyReadKeyb(argv[4], signing_key_algorithm, 1);
if (!signing_public_key) {
fprintf(stderr, "Error reading signing_public_key");
return 1;
}
data_public_key = PublicKeyReadKeyb(argv[6], data_key_algorithm, 1);
if (!data_public_key) {
fprintf(stderr, "Error reading data_public_key");
return 1;
}
KeyBlockVerifyTest(signing_public_key, signing_private_key, data_public_key);
VerifyFirmwarePreambleTest(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 error_code;
}
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