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/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <security/tpm/tspi.h>
#include <region_file.h>
#include <string.h>
#include <symbols.h>
#include <cbmem.h>
#include <vb2_sha.h>
void *tpm_log_cbmem_init(void)
{
static struct tpm_cb_log_table *tclt;
if (tclt)
return tclt;
if (cbmem_possibly_online()) {
tclt = cbmem_find(CBMEM_ID_TPM_CB_LOG);
if (!tclt) {
size_t tpm_log_len = sizeof(struct tpm_cb_log_table) +
MAX_TPM_LOG_ENTRIES * sizeof(struct tpm_cb_log_entry);
tclt = cbmem_add(CBMEM_ID_TPM_CB_LOG, tpm_log_len);
if (tclt) {
tclt->max_entries = MAX_TPM_LOG_ENTRIES;
tclt->num_entries = 0;
}
}
}
return tclt;
}
void tpm_log_dump(void *unused)
{
int i, j;
struct tpm_cb_log_table *tclt;
tclt = tpm_log_init();
if (!tclt)
return;
printk(BIOS_INFO, "coreboot TPM log measurements:\n\n");
for (i = 0; i < tclt->num_entries; i++) {
struct tpm_cb_log_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 tpm_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 tpm_cb_log_table *tclt = tpm_log_init();
if (!tclt) {
printk(BIOS_WARNING, "TPM LOG: Log non-existent!\n");
return;
}
if (tclt->num_entries >= tclt->max_entries) {
printk(BIOS_WARNING, "TPM LOG: log table is full\n");
return;
}
if (!name) {
printk(BIOS_WARNING, "TPM LOG: entry name not set\n");
return;
}
struct tpm_cb_log_entry *tce = &tclt->entries[tclt->num_entries++];
strncpy(tce->name, name, TPM_CB_LOG_PCR_HASH_NAME - 1);
tce->name[TPM_CB_LOG_PCR_HASH_NAME - 1] = '\0';
tce->pcr = pcr;
if (digest_len > TPM_CB_LOG_DIGEST_MAX_LENGTH) {
printk(BIOS_WARNING, "TPM LOG: PCR digest too long for log entry\n");
return;
}
strncpy(tce->digest_type,
vb2_get_hash_algorithm_name(digest_algo),
TPM_CB_LOG_PCR_HASH_LEN - 1);
tce->digest_length = digest_len;
memcpy(tce->digest, digest, tce->digest_length);
}
void tpm_preram_log_clear(void)
{
printk(BIOS_INFO, "TPM LOG: clearing preram log\n");
struct tpm_cb_log_table *tclt = (struct tpm_cb_log_table *)_tpm_log;
tclt->max_entries = MAX_TPM_LOG_ENTRIES;
tclt->num_entries = 0;
}
int tpm_log_get(int entry_idx, int *pcr, const uint8_t **digest_data,
enum vb2_hash_algorithm *digest_algo, const char **event_name)
{
struct tpm_cb_log_table *tclt;
struct tpm_cb_log_entry *tce;
enum vb2_hash_algorithm algo;
tclt = tpm_log_init();
if (!tclt)
return 1;
if (entry_idx < 0 || entry_idx >= tclt->num_entries)
return 1;
tce = &tclt->entries[entry_idx];
*pcr = tce->pcr;
*digest_data = tce->digest;
*event_name = tce->name;
*digest_algo = VB2_HASH_INVALID;
for (algo = VB2_HASH_INVALID; algo != VB2_HASH_ALG_COUNT; ++algo) {
if (strcmp(tce->digest_type, vb2_hash_names[algo]) == 0) {
*digest_algo = algo;
break;
}
}
return 0;
}
uint16_t tpm_log_get_size(const void *log_table)
{
const struct tpm_cb_log_table *tclt = log_table;
return tclt->num_entries;
}
void tpm_log_copy_entries(const void *from, void *to)
{
const struct tpm_cb_log_table *from_log = from;
struct tpm_cb_log_table *to_log = to;
int i;
for (i = 0; i < from_log->num_entries; i++) {
struct tpm_cb_log_entry *tce = &to_log->entries[to_log->num_entries++];
strncpy(tce->name, from_log->entries[i].name, TPM_CB_LOG_PCR_HASH_NAME - 1);
tce->name[TPM_CB_LOG_PCR_HASH_NAME - 1] = '\0';
tce->pcr = from_log->entries[i].pcr;
if (from_log->entries[i].digest_length > TPM_CB_LOG_DIGEST_MAX_LENGTH) {
printk(BIOS_WARNING, "TPM LOG: PCR digest too long for log entry\n");
return;
}
strncpy(tce->digest_type, from_log->entries[i].digest_type,
TPM_CB_LOG_PCR_HASH_LEN - 1);
tce->digest_type[TPM_CB_LOG_PCR_HASH_LEN - 1] = '\0';
tce->digest_length = MIN(from_log->entries[i].digest_length,
TPM_CB_LOG_DIGEST_MAX_LENGTH);
memcpy(tce->digest, from_log->entries[i].digest, tce->digest_length);
}
}
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