| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <console/console.h> |
| #include <security/tpm/tspi/logs.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_cb_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_cb_log_dump(void) |
| { |
| 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_cb_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_cb_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_cb_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_cb_log_get_size(const void *log_table) |
| { |
| const struct tpm_cb_log_table *tclt = log_table; |
| return tclt->num_entries; |
| } |
| |
| void tpm_cb_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); |
| } |
| } |