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/*
* 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.
*/
#include <console/console.h>
#include <fmap.h>
#include <cbfs.h>
#include <security/vboot/vboot_crtm.h>
#include <security/vboot/misc.h>
/*
* This functions sets the TCPA log namespace
* for the cbfs file (region) lookup.
*/
static int create_tcpa_metadata(const struct region_device *rdev,
const char *cbfs_name, char log_string[TCPA_PCR_HASH_NAME])
{
int i;
struct region_device fmap;
const static char *fmap_cbfs_names[] = {
"COREBOOT",
"FW_MAIN_A",
"FW_MAIN_B",
"RW_LEGACY"};
for (i = 0; i < ARRAY_SIZE(fmap_cbfs_names); i++) {
if (fmap_locate_area_as_rdev(fmap_cbfs_names[i], &fmap) == 0) {
if (region_is_subregion(region_device_region(&fmap),
region_device_region(rdev))) {
snprintf(log_string, TCPA_PCR_HASH_NAME,
"FMAP: %s CBFS: %s",
fmap_cbfs_names[i], cbfs_name);
return 0;
}
}
}
return -1;
}
uint32_t vboot_init_crtm(void)
{
struct prog bootblock = PROG_INIT(PROG_BOOTBLOCK, "bootblock");
struct prog verstage =
PROG_INIT(PROG_VERSTAGE, CONFIG_CBFS_PREFIX "/verstage");
struct prog romstage =
PROG_INIT(PROG_ROMSTAGE, CONFIG_CBFS_PREFIX "/romstage");
char tcpa_metadata[TCPA_PCR_HASH_NAME];
/* Initialize TCPE PRERAM log. */
tcpa_preram_log_clear();
/* measure bootblock from RO */
struct cbfsf bootblock_data;
struct region_device bootblock_fmap;
if (fmap_locate_area_as_rdev("BOOTBLOCK", &bootblock_fmap) == 0) {
if (tpm_measure_region(&bootblock_fmap,
TPM_CRTM_PCR,
"FMAP: BOOTBLOCK"))
return VB2_ERROR_UNKNOWN;
} else {
if (cbfs_boot_locate(&bootblock_data,
prog_name(&bootblock), NULL) == 0) {
cbfs_file_data(prog_rdev(&bootblock), &bootblock_data);
if (create_tcpa_metadata(prog_rdev(&bootblock),
prog_name(&bootblock), tcpa_metadata) < 0)
return VB2_ERROR_UNKNOWN;
if (tpm_measure_region(prog_rdev(&bootblock),
TPM_CRTM_PCR,
tcpa_metadata))
return VB2_ERROR_UNKNOWN;
} else {
printk(BIOS_INFO,
"VBOOT: Couldn't measure bootblock into CRTM!\n");
return VB2_ERROR_UNKNOWN;
}
}
if (CONFIG(VBOOT_STARTS_IN_ROMSTAGE)) {
struct cbfsf romstage_data;
/* measure romstage from RO */
if (cbfs_boot_locate(&romstage_data,
prog_name(&romstage), NULL) == 0) {
cbfs_file_data(prog_rdev(&romstage), &romstage_data);
if (create_tcpa_metadata(prog_rdev(&romstage),
prog_name(&romstage), tcpa_metadata) < 0)
return VB2_ERROR_UNKNOWN;
if (tpm_measure_region(prog_rdev(&romstage),
TPM_CRTM_PCR,
tcpa_metadata))
return VB2_ERROR_UNKNOWN;
} else {
printk(BIOS_INFO,
"VBOOT: Couldn't measure %s into CRTM!\n",
CONFIG_CBFS_PREFIX "/romstage");
return VB2_ERROR_UNKNOWN;
}
}
if (CONFIG(VBOOT_SEPARATE_VERSTAGE)) {
struct cbfsf verstage_data;
/* measure verstage from RO */
if (cbfs_boot_locate(&verstage_data,
prog_name(&verstage), NULL) == 0) {
cbfs_file_data(prog_rdev(&verstage), &verstage_data);
if (create_tcpa_metadata(prog_rdev(&verstage),
prog_name(&verstage), tcpa_metadata) < 0)
return VB2_ERROR_UNKNOWN;
if (tpm_measure_region(prog_rdev(&verstage),
TPM_CRTM_PCR,
tcpa_metadata))
return VB2_ERROR_UNKNOWN;
} else {
printk(BIOS_INFO,
"VBOOT: Couldn't measure %s into CRTM!\n",
CONFIG_CBFS_PREFIX "/verstage");
return VB2_ERROR_UNKNOWN;
}
}
return VB2_SUCCESS;
}
static bool is_runtime_data(const char *name)
{
const char *whitelist = CONFIG_VBOOT_MEASURED_BOOT_RUNTIME_DATA;
size_t whitelist_len = sizeof(CONFIG_VBOOT_MEASURED_BOOT_RUNTIME_DATA) - 1;
size_t name_len = strlen(name);
int i;
if (!whitelist_len || !name_len)
return false;
for (i = 0; (i + name_len) <= whitelist_len; i++) {
if (!strcmp(whitelist + i, name))
return true;
}
return false;
}
uint32_t vboot_measure_cbfs_hook(struct cbfsf *fh, const char *name)
{
uint32_t pcr_index;
uint32_t cbfs_type;
struct region_device rdev;
char tcpa_metadata[TCPA_PCR_HASH_NAME];
if (!vboot_logic_executed())
return 0;
cbfsf_file_type(fh, &cbfs_type);
cbfs_file_data(&rdev, fh);
switch (cbfs_type) {
case CBFS_TYPE_MRC:
case CBFS_TYPE_MRC_CACHE:
pcr_index = TPM_RUNTIME_DATA_PCR;
break;
case CBFS_TYPE_STAGE:
case CBFS_TYPE_SELF:
case CBFS_TYPE_FIT:
pcr_index = TPM_CRTM_PCR;
break;
default:
if (is_runtime_data(name))
pcr_index = TPM_RUNTIME_DATA_PCR;
else
pcr_index = TPM_CRTM_PCR;
break;
}
if (create_tcpa_metadata(&rdev, name, tcpa_metadata) < 0)
return VB2_ERROR_UNKNOWN;
return tpm_measure_region(&rdev, pcr_index, tcpa_metadata);
}
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