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/* Copyright 2015 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 kernel verification library, api layer
*/
#include <stdio.h>
#include "2api.h"
#include "2common.h"
#include "2misc.h"
#include "2nvstorage.h"
#include "2rsa.h"
#include "2secdata.h"
#include "2sysincludes.h"
#include "common/tests.h"
#include "vboot_struct.h"
/* Common context for tests */
static uint8_t workbuf[VB2_KERNEL_WORKBUF_RECOMMENDED_SIZE]
__attribute__((aligned(VB2_WORKBUF_ALIGN)));
static struct vb2_context *ctx;
static struct vb2_shared_data *sd;
static struct vb2_fw_preamble *fwpre;
static struct vb2_kernel_preamble *kpre;
static struct vb2_packed_key *kdkey;
static const char fw_kernel_key_data[36] = "Test kernel key data";
static char kernel_data[0x4008] = "Sure it's a kernel...";
/* Mocked function data */
static struct {
struct vb2_gbb_header h;
struct vb2_packed_key recovery_key;
char recovery_key_data[32];
} mock_gbb;
static int mock_read_res_fail_on_call;
static int mock_unpack_key_retval;
static int mock_load_kernel_keyblock_retval;
static int mock_load_kernel_preamble_retval;
static int mock_secdata_fwmp_check_retval;
/* Type of test to reset for */
enum reset_type {
FOR_PHASE1,
FOR_PHASE2,
FOR_PHASE3,
};
static void reset_common_data(enum reset_type t)
{
struct vb2_packed_key *k;
memset(workbuf, 0xaa, sizeof(workbuf));
TEST_SUCC(vb2api_init(workbuf, sizeof(workbuf), &ctx),
"vb2api_init failed");
sd = vb2_get_sd(ctx);
sd->status |= VB2_SD_STATUS_RECOVERY_DECIDED;
vb2_nv_init(ctx);
vb2api_secdata_kernel_create(ctx);
vb2_secdata_kernel_init(ctx);
vb2_secdata_kernel_set(ctx, VB2_SECDATA_KERNEL_VERSIONS, 0x20002);
mock_read_res_fail_on_call = 0;
mock_unpack_key_retval = VB2_SUCCESS;
mock_load_kernel_keyblock_retval = VB2_SUCCESS;
mock_load_kernel_preamble_retval = VB2_SUCCESS;
mock_secdata_fwmp_check_retval = VB2_SUCCESS;
/* Recovery key in mock GBB */
memset(&mock_gbb, 0, sizeof(mock_gbb));
mock_gbb.recovery_key.algorithm = 11;
mock_gbb.recovery_key.key_offset =
vb2_offset_of(&mock_gbb.recovery_key,
&mock_gbb.recovery_key_data);
mock_gbb.recovery_key.key_size = sizeof(mock_gbb.recovery_key_data);
strcpy(mock_gbb.recovery_key_data, "The recovery key");
mock_gbb.h.recovery_key_offset =
vb2_offset_of(&mock_gbb, &mock_gbb.recovery_key);
mock_gbb.h.recovery_key_size =
mock_gbb.recovery_key.key_offset +
mock_gbb.recovery_key.key_size;
if (t == FOR_PHASE1) {
uint8_t *kdata;
/* Create mock firmware preamble in the context */
sd->preamble_offset = sd->workbuf_used;
fwpre = (struct vb2_fw_preamble *)
vb2_member_of(sd, sd->preamble_offset);
k = &fwpre->kernel_subkey;
kdata = (uint8_t *)fwpre + sizeof(*fwpre);
memcpy(kdata, fw_kernel_key_data, sizeof(fw_kernel_key_data));
k->algorithm = 7;
k->key_offset = vb2_offset_of(k, kdata);
k->key_size = sizeof(fw_kernel_key_data);
sd->preamble_size = sizeof(*fwpre) + k->key_size;
vb2_set_workbuf_used(ctx,
sd->preamble_offset + sd->preamble_size);
/* Needed to check that secdata_kernel initialization is
performed by phase1 function. */
sd->status &= ~VB2_SD_STATUS_SECDATA_KERNEL_INIT;
} else if (t == FOR_PHASE2) {
struct vb2_signature *sig;
struct vb2_digest_context dc;
uint8_t *sdata;
/* Create mock kernel data key */
sd->data_key_offset = sd->workbuf_used;
kdkey = (struct vb2_packed_key *)
vb2_member_of(sd, sd->data_key_offset);
kdkey->algorithm = VB2_ALG_RSA2048_SHA256;
sd->data_key_size = sizeof(*kdkey);
vb2_set_workbuf_used(ctx,
sd->data_key_offset + sd->data_key_size);
/* Create mock kernel preamble in the context */
sd->preamble_offset = sd->workbuf_used;
kpre = (struct vb2_kernel_preamble *)
vb2_member_of(sd, sd->preamble_offset);
sdata = (uint8_t *)kpre + sizeof(*kpre);
sig = &kpre->body_signature;
sig->data_size = sizeof(kernel_data);
sig->sig_offset = vb2_offset_of(sig, sdata);
sig->sig_size = VB2_SHA512_DIGEST_SIZE;
vb2_digest_init(&dc, VB2_HASH_SHA256);
vb2_digest_extend(&dc, (const uint8_t *)kernel_data,
sizeof(kernel_data));
vb2_digest_finalize(&dc, sdata, sig->sig_size);
sd->preamble_size = sizeof(*kpre) + sig->sig_size;
sd->vblock_preamble_offset =
0x10000 - sd->preamble_size;
vb2_set_workbuf_used(ctx,
sd->preamble_offset + sd->preamble_size);
} else {
/* Set flags and versions for roll-forward */
sd->kernel_version = 0x20004;
sd->kernel_version_secdata = 0x20002;
sd->flags |= VB2_SD_FLAG_KERNEL_SIGNED;
ctx->flags |= VB2_CONTEXT_ALLOW_KERNEL_ROLL_FORWARD;
}
};
/* Mocked functions */
vb2_error_t vb2api_secdata_fwmp_check(struct vb2_context *c, uint8_t *size)
{
return mock_secdata_fwmp_check_retval;
}
struct vb2_gbb_header *vb2_get_gbb(struct vb2_context *c)
{
return &mock_gbb.h;
}
vb2_error_t vb2ex_read_resource(struct vb2_context *c,
enum vb2_resource_index index, uint32_t offset,
void *buf, uint32_t size)
{
uint8_t *rptr;
uint32_t rsize;
if (--mock_read_res_fail_on_call == 0)
return VB2_ERROR_MOCK;
switch(index) {
case VB2_RES_GBB:
rptr = (uint8_t *)&mock_gbb;
rsize = sizeof(mock_gbb);
break;
default:
return VB2_ERROR_EX_READ_RESOURCE_INDEX;
}
if (offset > rsize || offset + size > rsize)
return VB2_ERROR_EX_READ_RESOURCE_SIZE;
memcpy(buf, rptr + offset, size);
return VB2_SUCCESS;
}
vb2_error_t vb2_load_kernel_keyblock(struct vb2_context *c)
{
return mock_load_kernel_keyblock_retval;
}
vb2_error_t vb2_load_kernel_preamble(struct vb2_context *c)
{
return mock_load_kernel_preamble_retval;
}
vb2_error_t vb2_unpack_key_buffer(struct vb2_public_key *key,
const uint8_t *buf, uint32_t size)
{
const struct vb2_packed_key *k = (const struct vb2_packed_key *)buf;
key->arrsize = 0;
key->hash_alg = vb2_crypto_to_hash(k->algorithm);
return mock_unpack_key_retval;
}
vb2_error_t vb2_verify_digest(const struct vb2_public_key *key,
struct vb2_signature *sig, const uint8_t *digest,
const struct vb2_workbuf *wb)
{
if (memcmp(digest, (uint8_t *)sig + sig->sig_offset, sig->sig_size))
return VB2_ERROR_VDATA_VERIFY_DIGEST;
return VB2_SUCCESS;
}
/* Tests */
static void load_kernel_vblock_tests(void)
{
reset_common_data(FOR_PHASE1);
TEST_SUCC(vb2api_load_kernel_vblock(ctx), "load vblock good");
reset_common_data(FOR_PHASE1);
mock_load_kernel_keyblock_retval = VB2_ERROR_MOCK;
TEST_EQ(vb2api_load_kernel_vblock(ctx), VB2_ERROR_MOCK,
"load vblock bad keyblock");
reset_common_data(FOR_PHASE1);
mock_load_kernel_preamble_retval = VB2_ERROR_MOCK;
TEST_EQ(vb2api_load_kernel_vblock(ctx), VB2_ERROR_MOCK,
"load vblock bad preamble");
}
static void get_kernel_size_tests(void)
{
uint32_t offs, size;
reset_common_data(FOR_PHASE2);
offs = size = 0;
TEST_SUCC(vb2api_get_kernel_size(ctx, &offs, &size), "get size good");
TEST_EQ(offs, 0x10000, " offset");
TEST_EQ(size, sizeof(kernel_data), " size");
/* Don't need to pass pointers */
reset_common_data(FOR_PHASE2);
TEST_SUCC(vb2api_get_kernel_size(ctx, NULL, NULL), "get size null");
reset_common_data(FOR_PHASE2);
sd->preamble_size = 0;
TEST_EQ(vb2api_get_kernel_size(ctx, &offs, &size),
VB2_ERROR_API_GET_KERNEL_SIZE_PREAMBLE,
"get size no preamble");
}
static void verify_kernel_data_tests(void)
{
reset_common_data(FOR_PHASE2);
TEST_SUCC(vb2api_verify_kernel_data(ctx, kernel_data,
sizeof(kernel_data)),
"verify data good");
reset_common_data(FOR_PHASE2);
sd->preamble_size = 0;
TEST_EQ(vb2api_verify_kernel_data(ctx, kernel_data,
sizeof(kernel_data)),
VB2_ERROR_API_VERIFY_KDATA_PREAMBLE, "verify no preamble");
reset_common_data(FOR_PHASE2);
TEST_EQ(vb2api_verify_kernel_data(ctx, kernel_data,
sizeof(kernel_data) + 1),
VB2_ERROR_API_VERIFY_KDATA_SIZE, "verify size");
reset_common_data(FOR_PHASE2);
sd->workbuf_used = sd->workbuf_size + VB2_WORKBUF_ALIGN -
vb2_wb_round_up(sizeof(struct vb2_digest_context));
TEST_EQ(vb2api_verify_kernel_data(ctx, kernel_data,
sizeof(kernel_data)),
VB2_ERROR_API_VERIFY_KDATA_WORKBUF, "verify workbuf");
reset_common_data(FOR_PHASE2);
sd->data_key_size = 0;
TEST_EQ(vb2api_verify_kernel_data(ctx, kernel_data,
sizeof(kernel_data)),
VB2_ERROR_API_VERIFY_KDATA_KEY, "verify no key");
reset_common_data(FOR_PHASE2);
mock_unpack_key_retval = VB2_ERROR_MOCK;
TEST_EQ(vb2api_verify_kernel_data(ctx, kernel_data,
sizeof(kernel_data)),
VB2_ERROR_MOCK, "verify unpack key");
reset_common_data(FOR_PHASE2);
kdkey->algorithm = VB2_ALG_COUNT;
TEST_EQ(vb2api_verify_kernel_data(ctx, kernel_data,
sizeof(kernel_data)),
VB2_ERROR_SHA_INIT_ALGORITHM, "verify hash init");
reset_common_data(FOR_PHASE2);
sd->workbuf_used = sd->workbuf_size -
vb2_wb_round_up(sizeof(struct vb2_digest_context));
TEST_EQ(vb2api_verify_kernel_data(ctx, kernel_data,
sizeof(kernel_data)),
VB2_ERROR_API_CHECK_HASH_WORKBUF_DIGEST, "verify hash workbuf");
reset_common_data(FOR_PHASE2);
kernel_data[3] ^= 0xd0;
TEST_EQ(vb2api_verify_kernel_data(ctx, kernel_data,
sizeof(kernel_data)),
VB2_ERROR_VDATA_VERIFY_DIGEST, "verify hash digest");
kernel_data[3] ^= 0xd0;
}
static void phase3_tests(void)
{
uint32_t v;
reset_common_data(FOR_PHASE3);
TEST_SUCC(vb2api_kernel_phase3(ctx), "phase3 good");
v = vb2_secdata_kernel_get(ctx, VB2_SECDATA_KERNEL_VERSIONS);
TEST_EQ(v, 0x20004, " version");
reset_common_data(FOR_PHASE3);
sd->kernel_version = 0x20001;
TEST_SUCC(vb2api_kernel_phase3(ctx), "phase3 no rollback");
v = vb2_secdata_kernel_get(ctx, VB2_SECDATA_KERNEL_VERSIONS);
TEST_EQ(v, 0x20002, " version");
reset_common_data(FOR_PHASE3);
sd->flags &= ~VB2_SD_FLAG_KERNEL_SIGNED;
TEST_SUCC(vb2api_kernel_phase3(ctx), "phase3 unsigned kernel");
v = vb2_secdata_kernel_get(ctx, VB2_SECDATA_KERNEL_VERSIONS);
TEST_EQ(v, 0x20002, " version");
reset_common_data(FOR_PHASE3);
ctx->flags |= VB2_CONTEXT_RECOVERY_MODE;
TEST_SUCC(vb2api_kernel_phase3(ctx), "phase3 recovery");
v = vb2_secdata_kernel_get(ctx, VB2_SECDATA_KERNEL_VERSIONS);
TEST_EQ(v, 0x20002, " version");
reset_common_data(FOR_PHASE3);
ctx->flags &= ~VB2_CONTEXT_ALLOW_KERNEL_ROLL_FORWARD;
TEST_SUCC(vb2api_kernel_phase3(ctx), "phase3 no rollforward");
v = vb2_secdata_kernel_get(ctx, VB2_SECDATA_KERNEL_VERSIONS);
TEST_EQ(v, 0x20002, " version");
reset_common_data(FOR_PHASE3);
sd->status &= ~VB2_SD_STATUS_SECDATA_KERNEL_INIT;
TEST_ABORT(vb2api_kernel_phase3(ctx), "phase3 set fail");
}
int main(int argc, char* argv[])
{
load_kernel_vblock_tests();
get_kernel_size_tests();
verify_kernel_data_tests();
phase3_tests();
return gTestSuccess ? 0 : 255;
}
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