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vboot/tests/vb20_api_kernel_tests.c
Julius Werner 5ab30ec1c8 firmware: 2sha: Integrate HW crypto directly into vb2_digest API 
This patch moves the connection to the vb2ex_hwcrypto API further down
the stack, into the low-level vb2_digest and vb2_hash APIs. These
functions will now take an extra allow_hwcrypto argument that the caller
can use to deny or allow hwcrypto by policy. If allowed, the function
will try HW crypto first and fall back to the software implementation if
the selected algorithm is not supported. vb2_hwcrypto_allowed() is made
available to external callers as a vb2api function to make that decision
in most cases (for others, like userspace tools and testing, HW crypto
is generally not used anyway and they can just pass `false`).

Since vb2ex_hwcrypto_digest_init() takes a data_size argument for the
total amount of bytes expected, vb2_digest_init() will now also need to
take this extra argument. But since the total data size cannot always be
known in advance, callers are allowed to pass 0 to indicate that the
size is unknown. The software implementations work either way, and HW
crypto implementations will now need to check if data_size is 0 and
return HWCRYPTO_UNSUPPORTED if they cannot handle this case.

While we're touching everything anyway, let's take this opportunity to
retire the vb2_digest_buffer() API in favor of the newer and usually
more convenient vb2_hash_calculate(), so we can limit the amount of
separate APIs we have to support going forward.

BRANCH=none
BUG=b:240624460
TEST=runtests

Signed-off-by: Julius Werner <jwerner@chromium.org>
Cq-Depend: chromium:3854282
Change-Id: I34c3f54e31742619d422d1cd871bdb77ad0439b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3825558
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
2022-09-01 03:36:21 +00:00

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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, false, VB2_HASH_SHA256, 0);
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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