GNUBoot
/
coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

security/vboot: Add interface for FSP 2.0 mrc caching 

* Move vboot/tpm specific implementation to vboot.
* Only call functions if CONFIG_FSP2_0_USES_TPM_MRC_HASH is set.
* Preparation for software hash function support, no logic changed.

Change-Id: I41a458186c7981adaf3fea8974adec2ca8668f14
Signed-off-by: Philipp Deppenwiese <zaolin@das-labor.org>
Reviewed-on: https://review.coreboot.org/24904
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Philipp Deppenwiese 2018-02-27 22:14:34 +01:00 committed by Philipp Deppenwiese
parent d29c81d513
commit 80961af4b6
4 changed files with 155 additions and 99 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
src/drivers/intel/fsp2_0/include/fsp/memory_init.h Normal file
View File

@ -0,0 +1,32 @@
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2018 Facebook Inc
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _FSP2_0_MEMORY_INIT_H_
#define _FSP2_0_MEMORY_INIT_H_
#include <types.h>
/*
* Updates mrc cache hash if it differs.
*/
void mrc_cache_update_hash(const uint8_t *data, size_t size);
/*
* Verifies mrc cache hash which is stored somewhere.
* return 1 verification was successful and 0 for error.
*/
int mrc_cache_verify_hash(const uint8_t *data, size_t size);
#endif /* _FSP2_0_MEMORY_INIT_H_ */

105
src/drivers/intel/fsp2_0/memory_init.c
View File

@ -31,63 +31,10 @@
#include <string.h>
#include <symbols.h>
#include <timestamp.h>
#include <security/tpm/tspi.h>
#include <security/vboot/vboot_common.h>
#include <security/tpm/tspi.h>
#include <vb2_api.h>
static void mrc_cache_update_tpm_hash(const uint8_t *data, size_t size)
{
uint8_t data_hash[VB2_SHA256_DIGEST_SIZE];
static const uint8_t dead_hash[VB2_SHA256_DIGEST_SIZE] = {
0xba, 0xad, 0xda, 0x1a, /* BAADDA1A */
0xde, 0xad, 0xde, 0xad, /* DEADDEAD */
0xde, 0xad, 0xda, 0x1a, /* DEADDA1A */
0xba, 0xad, 0xba, 0xad, /* BAADBAAD */
0xba, 0xad, 0xda, 0x1a, /* BAADDA1A */
0xde, 0xad, 0xde, 0xad, /* DEADDEAD */
0xde, 0xad, 0xda, 0x1a, /* DEADDA1A */
0xba, 0xad, 0xba, 0xad, /* BAADBAAD */
};
const uint8_t *hash_ptr = data_hash;
/* We do not store normal mode data hash in TPM. */
if (!vboot_recovery_mode_enabled())
return;
/* Bail out early if no mrc hash space is supported in TPM. */
if (!IS_ENABLED(CONFIG_FSP2_0_USES_TPM_MRC_HASH))
return;
/* Initialize TPM driver. */
if (tlcl_lib_init() != VB2_SUCCESS) {
printk(BIOS_ERR, "MRC: TPM driver initialization failed.\n");
return;
}
/* Calculate hash of data generated by MRC. */
if (vb2_digest_buffer(data, size, VB2_HASH_SHA256, data_hash,
sizeof(data_hash))) {
printk(BIOS_ERR, "MRC: SHA-256 calculation failed for data. "
"Not updating TPM hash space.\n");
/*
* Since data is being updated in recovery cache, the hash
* currently stored in TPM recovery hash space is no longer
* valid. If we are not able to calculate hash of the data being
* updated, reset all the bits in TPM recovery hash space to
* pre-defined hash pattern.
*/
hash_ptr = dead_hash;
}
/* Write hash of data to TPM space. */
if (antirollback_write_space_rec_hash(hash_ptr, VB2_SHA256_DIGEST_SIZE)
!= TPM_SUCCESS) {
printk(BIOS_ERR, "MRC: Could not save hash to TPM.\n");
return;
}
printk(BIOS_INFO, "MRC: TPM MRC hash updated successfully.\n");
}
#include <fsp/memory_init.h>
static void save_memory_training_data(bool s3wake, uint32_t fsp_version)
{
@ -113,7 +60,8 @@ static void save_memory_training_data(bool s3wake, uint32_t fsp_version)
mrc_data_size) < 0)
printk(BIOS_ERR, "Failed to stash MRC data\n");
mrc_cache_update_tpm_hash(mrc_data, mrc_data_size);
if (IS_ENABLED(CONFIG_FSP2_0_USES_TPM_MRC_HASH))
mrc_cache_update_hash(mrc_data, mrc_data_size);
}
static void do_fsp_post_memory_init(bool s3wake, uint32_t fsp_version)
@ -156,48 +104,6 @@ static void do_fsp_post_memory_init(bool s3wake, uint32_t fsp_version)
tpm_setup(s3wake);
}
static int mrc_cache_verify_tpm_hash(const uint8_t *data, size_t size)
{
uint8_t data_hash[VB2_SHA256_DIGEST_SIZE];
uint8_t tpm_hash[VB2_SHA256_DIGEST_SIZE];
/* We do not store normal mode data hash in TPM. */
if (!vboot_recovery_mode_enabled())
return 1;
if (!IS_ENABLED(CONFIG_FSP2_0_USES_TPM_MRC_HASH))
return 1;
/* Calculate hash of data read from RECOVERY_MRC_CACHE. */
if (vb2_digest_buffer(data, size, VB2_HASH_SHA256, data_hash,
sizeof(data_hash))) {
printk(BIOS_ERR, "MRC: SHA-256 calculation failed for data.\n");
return 0;
}
/* Initialize TPM driver. */
if (tlcl_lib_init() != VB2_SUCCESS) {
printk(BIOS_ERR, "MRC: TPM driver initialization failed.\n");
return 0;
}
/* Read hash of MRC data saved in TPM. */
if (antirollback_read_space_rec_hash(tpm_hash, sizeof(tpm_hash))
!= TPM_SUCCESS) {
printk(BIOS_ERR, "MRC: Could not read hash from TPM.\n");
return 0;
}
if (memcmp(tpm_hash, data_hash, sizeof(tpm_hash))) {
printk(BIOS_ERR, "MRC: Hash comparison failed.\n");
return 0;
}
printk(BIOS_INFO, "MRC: Hash comparison successful. "
"Using data from RECOVERY_MRC_CACHE\n");
return 1;
}
static void fsp_fill_mrc_cache(FSPM_ARCH_UPD *arch_upd, uint32_t fsp_version)
{
struct region_device rdev;
@ -230,7 +136,8 @@ static void fsp_fill_mrc_cache(FSPM_ARCH_UPD *arch_upd, uint32_t fsp_version)
if (data == NULL)
return;
if (!mrc_cache_verify_tpm_hash(data, region_device_sz(&rdev)))
if (IS_ENABLED(CONFIG_FSP2_0_USES_TPM_MRC_HASH) &&
!mrc_cache_verify_hash(data, region_device_sz(&rdev)))
return;
/* MRC cache found */

2
src/security/vboot/Makefile.inc
View File

@ -78,6 +78,8 @@ romstage-y += vboot_handoff.c common.c
ramstage-y += common.c
postcar-y += common.c
romstage-$(CONFIG_FSP2_0_USES_TPM_MRC_HASH) += mrc_cache_hash_tpm.c
ifeq ($(CONFIG_VBOOT_SEPARATE_VERSTAGE),y)
VB_FIRMWARE_ARCH := $(ARCHDIR-$(ARCH-verstage-y))
else

115
src/security/vboot/mrc_cache_hash_tpm.c Normal file
View File

@ -0,0 +1,115 @@
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2018 Facebook Inc
* Copyright (C) 2015-2016 Intel Corp.
* (Written by Andrey Petrov <andrey.petrov@intel.com> for Intel Corp.)
* (Written by Alexandru Gagniuc <alexandrux.gagniuc@intel.com> for Intel Corp.)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <security/vboot/antirollback.h>
#include <program_loading.h>
#include <security/vboot/vboot_common.h>
#include <vb2_api.h>
#include <security/tpm/tss.h>
#include <fsp/memory_init.h>
#include <console/console.h>
#include <string.h>
void mrc_cache_update_hash(const uint8_t *data, size_t size)
{
uint8_t data_hash[VB2_SHA256_DIGEST_SIZE];
static const uint8_t dead_hash[VB2_SHA256_DIGEST_SIZE] = {
0xba, 0xad, 0xda, 0x1a, /* BAADDA1A */
0xde, 0xad, 0xde, 0xad, /* DEADDEAD */
0xde, 0xad, 0xda, 0x1a, /* DEADDA1A */
0xba, 0xad, 0xba, 0xad, /* BAADBAAD */
0xba, 0xad, 0xda, 0x1a, /* BAADDA1A */
0xde, 0xad, 0xde, 0xad, /* DEADDEAD */
0xde, 0xad, 0xda, 0x1a, /* DEADDA1A */
0xba, 0xad, 0xba, 0xad, /* BAADBAAD */
};
const uint8_t *hash_ptr = data_hash;
/* We do not store normal mode data hash in TPM. */
if (!vboot_recovery_mode_enabled())
return;
/* Initialize TPM driver. */
if (tlcl_lib_init() != VB2_SUCCESS) {
printk(BIOS_ERR, "MRC: TPM driver initialization failed.\n");
return;
}
/* Calculate hash of data generated by MRC. */
if (vb2_digest_buffer(data, size, VB2_HASH_SHA256, data_hash,
sizeof(data_hash))) {
printk(BIOS_ERR, "MRC: SHA-256 calculation failed for data. "
"Not updating TPM hash space.\n");
/*
* Since data is being updated in recovery cache, the hash
* currently stored in TPM recovery hash space is no longer
* valid. If we are not able to calculate hash of the data being
* updated, reset all the bits in TPM recovery hash space to
* pre-defined hash pattern.
*/
hash_ptr = dead_hash;
}
/* Write hash of data to TPM space. */
if (antirollback_write_space_rec_hash(hash_ptr, VB2_SHA256_DIGEST_SIZE)
!= TPM_SUCCESS) {
printk(BIOS_ERR, "MRC: Could not save hash to TPM.\n");
return;
}
printk(BIOS_INFO, "MRC: TPM MRC hash updated successfully.\n");
}
int mrc_cache_verify_hash(const uint8_t *data, size_t size)
{
uint8_t data_hash[VB2_SHA256_DIGEST_SIZE];
uint8_t tpm_hash[VB2_SHA256_DIGEST_SIZE];
/* We do not store normal mode data hash in TPM. */
if (!vboot_recovery_mode_enabled())
return 1;
/* Calculate hash of data read from RECOVERY_MRC_CACHE. */
if (vb2_digest_buffer(data, size, VB2_HASH_SHA256, data_hash,
sizeof(data_hash))) {
printk(BIOS_ERR, "MRC: SHA-256 calculation failed for data.\n");
return 0;
}
/* Initialize TPM driver. */
if (tlcl_lib_init() != VB2_SUCCESS) {
printk(BIOS_ERR, "MRC: TPM driver initialization failed.\n");
return 0;
}
/* Read hash of MRC data saved in TPM. */
if (antirollback_read_space_rec_hash(tpm_hash, sizeof(tpm_hash))
!= TPM_SUCCESS) {
printk(BIOS_ERR, "MRC: Could not read hash from TPM.\n");
return 0;
}
if (memcmp(tpm_hash, data_hash, sizeof(tpm_hash))) {
printk(BIOS_ERR, "MRC: Hash comparison failed.\n");
return 0;
}
printk(BIOS_INFO, "MRC: Hash comparison successful. "
"Using data from RECOVERY_MRC_CACHE\n");
return 1;
}