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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.
*
* Secure storage APIs - kernel version space
*/
#include "2common.h"
#include "2crc8.h"
#include "2misc.h"
#include "2secdata.h"
#include "2secdata_struct.h"
#include "2sysincludes.h"
#include "vboot_test.h"
#define MAJOR_VER(x) (((x) & 0xf0) >> 4)
#define MINOR_VER(x) ((x) & 0x0f)
static inline int is_v0(struct vb2_context *ctx)
{
struct vb2_secdata_kernel_v1 *sec = (void *)ctx->secdata_kernel;
return MAJOR_VER(sec->struct_version) == 0;
}
uint8_t vb2_secdata_kernel_crc(struct vb2_context *ctx)
{
size_t offset, size;
if (is_v0(ctx)) {
offset = 0;
size = offsetof(struct vb2_secdata_kernel_v0, crc8);
} else {
struct vb2_secdata_kernel_v1 *sec
= (void *)ctx->secdata_kernel;
offset = offsetof(struct vb2_secdata_kernel_v1, reserved0);
size = sec->struct_size - offset;
}
return vb2_crc8(ctx->secdata_kernel + offset, size);
}
static vb2_error_t secdata_kernel_check_v0(struct vb2_context *ctx,
uint8_t *size)
{
struct vb2_secdata_kernel_v0 *sec = (void *)ctx->secdata_kernel;
uint8_t ver = sec->struct_version;
if (MINOR_VER(ver) != MINOR_VER(VB2_SECDATA_KERNEL_VERSION_V02)) {
VB2_DEBUG("secdata_kernel: bad struct_version (%d.%d)\n",
MAJOR_VER(ver), MINOR_VER(ver));
return VB2_ERROR_SECDATA_KERNEL_VERSION;
}
*size = VB2_SECDATA_KERNEL_SIZE_V02;
/* Verify CRC */
if (sec->crc8 != vb2_secdata_kernel_crc(ctx)) {
VB2_DEBUG("secdata_kernel: bad CRC\n");
return VB2_ERROR_SECDATA_KERNEL_CRC;
}
/* Verify UID */
if (sec->uid != VB2_SECDATA_KERNEL_UID) {
VB2_DEBUG("secdata_kernel: bad UID\n");
return VB2_ERROR_SECDATA_KERNEL_UID;
}
return VB2_SUCCESS;
}
static vb2_error_t secdata_kernel_check_v1(struct vb2_context *ctx,
uint8_t *size)
{
struct vb2_secdata_kernel_v1 *sec = (void *)ctx->secdata_kernel;
uint8_t ver = sec->struct_version;
if (MAJOR_VER(ver) != MAJOR_VER(VB2_SECDATA_KERNEL_VERSION_V10)) {
VB2_DEBUG("secdata_kernel: bad struct_version (%d.%d)\n",
MAJOR_VER(ver), MINOR_VER(ver));
return VB2_ERROR_SECDATA_KERNEL_VERSION;
}
if (sec->struct_size < VB2_SECDATA_KERNEL_SIZE_V10 ||
VB2_SECDATA_KERNEL_MAX_SIZE < sec->struct_size) {
VB2_DEBUG("secdata_kernel: bad struct_size (%d)\n",
sec->struct_size);
return VB2_ERROR_SECDATA_KERNEL_STRUCT_SIZE;
}
if (*size < sec->struct_size) {
VB2_DEBUG("secdata_kernel: incomplete data (missing %d bytes)\n",
sec->struct_size - *size);
*size = sec->struct_size;
return VB2_ERROR_SECDATA_KERNEL_INCOMPLETE;
}
/*
* In case larger data should be passed, kindly let the caller know
* the right size.
*/
*size = sec->struct_size;
/* Verify CRC */
if (sec->crc8 != vb2_secdata_kernel_crc(ctx)) {
VB2_DEBUG("secdata_kernel: bad CRC\n");
return VB2_ERROR_SECDATA_KERNEL_CRC;
}
return VB2_SUCCESS;
}
vb2_error_t vb2api_secdata_kernel_check(struct vb2_context *ctx, uint8_t *size)
{
if (*size < VB2_SECDATA_KERNEL_MIN_SIZE) {
VB2_DEBUG("secdata_kernel: data size too small!\n");
*size = VB2_SECDATA_KERNEL_MIN_SIZE;
return VB2_ERROR_SECDATA_KERNEL_INCOMPLETE;
}
if (is_v0(ctx))
return secdata_kernel_check_v0(ctx, size);
else
return secdata_kernel_check_v1(ctx, size);
}
uint32_t vb2api_secdata_kernel_create(struct vb2_context *ctx)
{
struct vb2_secdata_kernel_v1 *sec = (void *)ctx->secdata_kernel;
/* Populate the struct */
memset(sec, 0, sizeof(*sec));
sec->struct_version = VB2_SECDATA_KERNEL_VERSION_LATEST;
sec->struct_size = sizeof(*sec);
sec->crc8 = vb2_secdata_kernel_crc(ctx);
/* Mark as changed */
ctx->flags |= VB2_CONTEXT_SECDATA_KERNEL_CHANGED;
return sizeof(*sec);
}
/* For TPM 1.2 */
uint32_t vb2api_secdata_kernel_create_v0(struct vb2_context *ctx)
{
struct vb2_secdata_kernel_v0 *sec = (void *)ctx->secdata_kernel;
/* Clear the entire struct */
memset(sec, 0, sizeof(*sec));
/* Set to current version */
sec->struct_version = VB2_SECDATA_KERNEL_VERSION_V02;
/* Set UID */
sec->uid = VB2_SECDATA_KERNEL_UID;
/* Calculate initial CRC */
sec->crc8 = vb2_crc8(sec, offsetof(struct vb2_secdata_kernel_v0, crc8));
/* Mark as changed */
ctx->flags |= VB2_CONTEXT_SECDATA_KERNEL_CHANGED;
return sizeof(*sec);
}
vb2_error_t vb2_secdata_kernel_init(struct vb2_context *ctx)
{
struct vb2_shared_data *sd = vb2_get_sd(ctx);
uint8_t size = VB2_SECDATA_KERNEL_MAX_SIZE;
VB2_TRY(vb2api_secdata_kernel_check(ctx, &size));
/* Set status flag */
sd->status |= VB2_SD_STATUS_SECDATA_KERNEL_INIT;
return VB2_SUCCESS;
}
uint32_t vb2_secdata_kernel_get(struct vb2_context *ctx,
enum vb2_secdata_kernel_param param)
{
struct vb2_shared_data *sd = vb2_get_sd(ctx);
const char *msg;
if (!(sd->status & VB2_SD_STATUS_SECDATA_KERNEL_INIT)) {
msg = "get before init";
goto fail;
}
switch (param) {
case VB2_SECDATA_KERNEL_VERSIONS:
if (is_v0(ctx)) {
struct vb2_secdata_kernel_v0 *sec =
(void *)ctx->secdata_kernel;
return sec->kernel_versions;
} else {
struct vb2_secdata_kernel_v1 *sec =
(void *)ctx->secdata_kernel;
return sec->kernel_versions;
}
default:
msg = "invalid param";
}
fail:
VB2_REC_OR_DIE(ctx, "%s\n", msg);
return 0;
}
void vb2_secdata_kernel_set(struct vb2_context *ctx,
enum vb2_secdata_kernel_param param,
uint32_t value)
{
struct vb2_shared_data *sd = vb2_get_sd(ctx);
const char *msg;
struct vb2_secdata_kernel_v0 *v0 = (void *)ctx->secdata_kernel;
struct vb2_secdata_kernel_v1 *v1 = (void *)ctx->secdata_kernel;
uint32_t *ptr;
if (!(sd->status & VB2_SD_STATUS_SECDATA_KERNEL_INIT)) {
msg = "set before init";
goto fail;
}
/* If not changing the value, just return early */
if (value == vb2_secdata_kernel_get(ctx, param))
return;
switch (param) {
case VB2_SECDATA_KERNEL_VERSIONS:
ptr = is_v0(ctx) ? &v0->kernel_versions : &v1->kernel_versions;
VB2_DEBUG("secdata_kernel versions updated from %#x to %#x\n",
*ptr, value);
break;
default:
msg = "invalid param";
goto fail;
}
*ptr = value;
if (is_v0(ctx))
v0->crc8 = vb2_secdata_kernel_crc(ctx);
else
v1->crc8 = vb2_secdata_kernel_crc(ctx);
ctx->flags |= VB2_CONTEXT_SECDATA_KERNEL_CHANGED;
return;
fail:
VB2_REC_OR_DIE(ctx, "%s\n", msg);
}
const uint8_t *vb2_secdata_kernel_get_ec_hash(struct vb2_context *ctx)
{
struct vb2_shared_data *sd = vb2_get_sd(ctx);
struct vb2_secdata_kernel_v1 *sec = (void *)ctx->secdata_kernel;
if (!(sd->status & VB2_SD_STATUS_SECDATA_KERNEL_INIT)) {
VB2_REC_OR_DIE(ctx, "Get kernel secdata before init\n");
return NULL;
}
if (is_v0(ctx)) {
VB2_DEBUG("kernel secdata v.0* doesn't support EC hash\n");
return NULL;
}
return sec->ec_hash;
}
void vb2_secdata_kernel_set_ec_hash(struct vb2_context *ctx,
const uint8_t *sha256)
{
struct vb2_shared_data *sd = vb2_get_sd(ctx);
struct vb2_secdata_kernel_v1 *sec = (void *)ctx->secdata_kernel;
if (!(sd->status & VB2_SD_STATUS_SECDATA_KERNEL_INIT)) {
VB2_REC_OR_DIE(ctx, "Get kernel secdata before init\n");
return;
}
if (is_v0(ctx)) {
VB2_REC_OR_DIE(ctx, "Invalid version of kernel secdata\n");
return;
}
memcpy(sec->ec_hash, sha256, sizeof(sec->ec_hash));
sec->crc8 = vb2_secdata_kernel_crc(ctx);
ctx->flags |= VB2_CONTEXT_SECDATA_KERNEL_CHANGED;
return;
}
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