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/*
* This file is part of the coreboot project.
*
* Copyright 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 <security/tpm/tspi.h>
#include <arch/early_variables.h>
#include <fmap.h>
#include <region_file.h>
#include <string.h>
#include <security/vboot/symbols.h>
#include <cbmem.h>
#include <bootstate.h>
#include <vb2_sha.h>
static struct tcpa_table *tcpa_cbmem_init(void)
{
MAYBE_STATIC_BSS struct tcpa_table *tclt = NULL;
if (tclt)
return tclt;
if (cbmem_possibly_online()) {
tclt = cbmem_find(CBMEM_ID_TCPA_LOG);
if (!tclt) {
size_t tcpa_log_len = sizeof(struct tcpa_table) +
MAX_TCPA_LOG_ENTRIES * sizeof(struct tcpa_entry);
tclt = cbmem_add(CBMEM_ID_TCPA_LOG, tcpa_log_len);
if (tclt) {
tclt->max_entries = MAX_TCPA_LOG_ENTRIES;
tclt->num_entries = 0;
}
}
}
return tclt;
}
static struct tcpa_table *tcpa_log_init(void)
{
MAYBE_STATIC_BSS struct tcpa_table *tclt = NULL;
/* We are dealing here with pre CBMEM environment.
* If cbmem isn't available use CAR or SRAM */
if (!cbmem_possibly_online() &&
!CONFIG(VBOOT_RETURN_FROM_VERSTAGE))
return (struct tcpa_table *)_vboot2_tpm_log;
else if (ENV_ROMSTAGE &&
!CONFIG(VBOOT_RETURN_FROM_VERSTAGE)) {
tclt = tcpa_cbmem_init();
if (!tclt)
return (struct tcpa_table *)_vboot2_tpm_log;
} else {
tclt = tcpa_cbmem_init();
}
return tclt;
}
void tcpa_log_dump(void *unused)
{
int i, j;
struct tcpa_table *tclt;
tclt = tcpa_log_init();
if (!tclt)
return;
printk(BIOS_INFO, "coreboot TCPA measurements:\n\n");
for (i = 0; i < tclt->num_entries; i++) {
struct tcpa_entry *tce = &tclt->entries[i];
if (tce) {
printk(BIOS_INFO, " PCR-%u ", tce->pcr);
for (j = 0; j < tce->digest_length; j++)
printk(BIOS_INFO, "%02x", tce->digest[j]);
printk(BIOS_INFO, " %s [%s]\n",
tce->digest_type, tce->name);
}
}
printk(BIOS_INFO, "\n");
}
void tcpa_log_add_table_entry(const char *name, const uint32_t pcr,
enum vb2_hash_algorithm digest_algo,
const uint8_t *digest,
const size_t digest_len)
{
struct tcpa_table *tclt = tcpa_log_init();
if (!tclt) {
printk(BIOS_WARNING, "TCPA: Log non-existent!\n");
return;
}
if (tclt->num_entries >= tclt->max_entries) {
printk(BIOS_WARNING, "TCPA: TCPA log table is full\n");
return;
}
if (!name) {
printk(BIOS_WARNING, "TCPA: TCPA entry name not set\n");
return;
}
struct tcpa_entry *tce = &tclt->entries[tclt->num_entries++];
strncpy(tce->name, name, TCPA_PCR_HASH_NAME - 1);
tce->pcr = pcr;
if (digest_len > TCPA_DIGEST_MAX_LENGTH) {
printk(BIOS_WARNING, "TCPA: PCR digest too long for TCPA log entry\n");
return;
}
strncpy(tce->digest_type,
vb2_get_hash_algorithm_name(digest_algo),
TCPA_PCR_HASH_LEN - 1);
tce->digest_length = digest_len;
memcpy(tce->digest, digest, tce->digest_length);
}
void tcpa_preram_log_clear(void)
{
printk(BIOS_INFO, "TCPA: Clearing coreboot TCPA log\n");
struct tcpa_table *tclt = (struct tcpa_table *)_vboot2_tpm_log;
tclt->max_entries = MAX_TCPA_LOG_ENTRIES;
tclt->num_entries = 0;
}
#if !CONFIG(VBOOT_RETURN_FROM_VERSTAGE)
static void recover_tcpa_log(int is_recovery)
{
struct tcpa_table *preram_log = (struct tcpa_table *)_vboot2_tpm_log;
struct tcpa_table *ram_log = NULL;
int i;
if (preram_log->num_entries > MAX_PRERAM_TCPA_LOG_ENTRIES) {
printk(BIOS_WARNING, "TCPA: Pre-RAM TCPA log is too full, possible corruption\n");
return;
}
ram_log = tcpa_cbmem_init();
if (!ram_log) {
printk(BIOS_WARNING, "TCPA: CBMEM not available something went wrong\n");
return;
}
for (i = 0; i < preram_log->num_entries; i++) {
struct tcpa_entry *tce = &ram_log->entries[ram_log->num_entries++];
strncpy(tce->name, preram_log->entries[i].name, TCPA_PCR_HASH_NAME - 1);
tce->pcr = preram_log->entries[i].pcr;
if (preram_log->entries[i].digest_length > TCPA_DIGEST_MAX_LENGTH) {
printk(BIOS_WARNING, "TCPA: PCR digest too long for TCPA log entry\n");
return;
}
strncpy(tce->digest_type, preram_log->entries[i].digest_type, TCPA_PCR_HASH_LEN - 1);
tce->digest_length = MIN(preram_log->entries[i].digest_length, TCPA_DIGEST_MAX_LENGTH);
memcpy(tce->digest, preram_log->entries[i].digest, tce->digest_length);
}
}
ROMSTAGE_CBMEM_INIT_HOOK(recover_tcpa_log);
#endif
BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_BOOT, BS_ON_ENTRY, tcpa_log_dump, NULL);
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