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/*
* Copyright (c) 2020, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <string.h>
#include <common/debug.h>
#include <drivers/measured_boot/event_log/event_log.h>
#if LOG_LEVEL >= EVENT_LOG_LEVEL
/*
* Print TCG_EfiSpecIDEventStruct
*
* @param[in/out] log_addr Pointer to Event Log
* @param[in/out] log_size Pointer to Event Log size
*/
static void id_event_print(uint8_t **log_addr, size_t *log_size)
{
unsigned int i;
uint8_t info_size, *info_size_ptr;
void *ptr = *log_addr;
id_event_headers_t *event = (id_event_headers_t *)ptr;
id_event_algorithm_size_t *alg_ptr;
uint32_t event_size, number_of_algorithms;
size_t digest_len;
#if ENABLE_ASSERTIONS
const uint8_t *end_ptr = (uint8_t *)((uintptr_t)*log_addr + *log_size);
bool valid = true;
#endif
assert(*log_size >= sizeof(id_event_headers_t));
/* The fields of the event log header are defined to be PCRIndex of 0,
* EventType of EV_NO_ACTION, Digest of 20 bytes of 0, and
* Event content defined as TCG_EfiSpecIDEventStruct.
*/
LOG_EVENT("TCG_EfiSpecIDEvent:\n");
LOG_EVENT(" PCRIndex : %u\n", event->header.pcr_index);
assert(event->header.pcr_index == (uint32_t)PCR_0);
LOG_EVENT(" EventType : %u\n", event->header.event_type);
assert(event->header.event_type == EV_NO_ACTION);
LOG_EVENT(" Digest :");
for (i = 0U; i < sizeof(event->header.digest); ++i) {
uint8_t val = event->header.digest[i];
(void)printf(" %02x", val);
if ((i & U(0xF)) == 0U) {
(void)printf("\n");
LOG_EVENT("\t\t :");
}
#if ENABLE_ASSERTIONS
if (val != 0U) {
valid = false;
}
#endif
}
if ((i & U(0xF)) != 0U) {
(void)printf("\n");
}
assert(valid);
/* EventSize */
event_size = event->header.event_size;
LOG_EVENT(" EventSize : %u\n", event_size);
LOG_EVENT(" Signature : %s\n",
event->struct_header.signature);
LOG_EVENT(" PlatformClass : %u\n",
event->struct_header.platform_class);
LOG_EVENT(" SpecVersion : %u.%u.%u\n",
event->struct_header.spec_version_major,
event->struct_header.spec_version_minor,
event->struct_header.spec_errata);
LOG_EVENT(" UintnSize : %u\n",
event->struct_header.uintn_size);
/* NumberOfAlgorithms */
number_of_algorithms = event->struct_header.number_of_algorithms;
LOG_EVENT(" NumberOfAlgorithms : %u\n", number_of_algorithms);
/* Address of DigestSizes[] */
alg_ptr = event->struct_header.digest_size;
/* Size of DigestSizes[] */
digest_len = number_of_algorithms * sizeof(id_event_algorithm_size_t);
assert(((uintptr_t)alg_ptr + digest_len) <= (uintptr_t)end_ptr);
LOG_EVENT(" DigestSizes :\n");
for (i = 0U; i < number_of_algorithms; ++i) {
LOG_EVENT(" #%u AlgorithmId : SHA", i);
uint16_t algorithm_id = alg_ptr[i].algorithm_id;
switch (algorithm_id) {
case TPM_ALG_SHA256:
(void)printf("256\n");
break;
case TPM_ALG_SHA384:
(void)printf("384\n");
break;
case TPM_ALG_SHA512:
(void)printf("512\n");
break;
default:
(void)printf("?\n");
ERROR("Algorithm 0x%x not found\n", algorithm_id);
assert(false);
}
LOG_EVENT(" DigestSize : %u\n",
alg_ptr[i].digest_size);
}
/* Address of VendorInfoSize */
info_size_ptr = (uint8_t *)((uintptr_t)alg_ptr + digest_len);
assert((uintptr_t)info_size_ptr <= (uintptr_t)end_ptr);
info_size = *info_size_ptr++;
LOG_EVENT(" VendorInfoSize : %u\n", info_size);
/* Check VendorInfo end address */
assert(((uintptr_t)info_size_ptr + info_size) <= (uintptr_t)end_ptr);
/* Check EventSize */
assert(event_size == (sizeof(id_event_struct_t) +
digest_len + info_size));
if (info_size != 0U) {
LOG_EVENT(" VendorInfo :");
for (i = 0U; i < info_size; ++i) {
(void)printf(" %02x", *info_size_ptr++);
}
(void)printf("\n");
}
*log_size -= (uintptr_t)info_size_ptr - (uintptr_t)*log_addr;
*log_addr = info_size_ptr;
}
/*
* Print TCG_PCR_EVENT2
*
* @param[in/out] log_addr Pointer to Event Log
* @param[in/out] log_size Pointer to Event Log size
*/
static void event2_print(uint8_t **log_addr, size_t *log_size)
{
uint32_t event_size, count;
size_t sha_size, digests_size = 0U;
void *ptr = *log_addr;
#if ENABLE_ASSERTIONS
const uint8_t *end_ptr = (uint8_t *)((uintptr_t)*log_addr + *log_size);
#endif
assert(*log_size >= sizeof(event2_header_t));
LOG_EVENT("PCR_Event2:\n");
LOG_EVENT(" PCRIndex : %u\n",
((event2_header_t *)ptr)->pcr_index);
LOG_EVENT(" EventType : %u\n",
((event2_header_t *)ptr)->event_type);
count = ((event2_header_t *)ptr)->digests.count;
LOG_EVENT(" Digests Count : %u\n", count);
/* Address of TCG_PCR_EVENT2.Digests[] */
ptr = (uint8_t *)ptr + sizeof(event2_header_t);
assert(((uintptr_t)ptr <= (uintptr_t)end_ptr) && (count != 0U));
for (unsigned int i = 0U; i < count; ++i) {
/* Check AlgorithmId address */
assert(((uintptr_t)ptr +
offsetof(tpmt_ha, digest)) <= (uintptr_t)end_ptr);
LOG_EVENT(" #%u AlgorithmId : SHA", i);
switch (((tpmt_ha *)ptr)->algorithm_id) {
case TPM_ALG_SHA256:
sha_size = SHA256_DIGEST_SIZE;
(void)printf("256\n");
break;
case TPM_ALG_SHA384:
sha_size = SHA384_DIGEST_SIZE;
(void)printf("384\n");
break;
case TPM_ALG_SHA512:
sha_size = SHA512_DIGEST_SIZE;
(void)printf("512\n");
break;
default:
(void)printf("?\n");
ERROR("Algorithm 0x%x not found\n",
((tpmt_ha *)ptr)->algorithm_id);
panic();
}
/* End of Digest[] */
ptr = (uint8_t *)((uintptr_t)ptr + offsetof(tpmt_ha, digest));
assert(((uintptr_t)ptr + sha_size) <= (uintptr_t)end_ptr);
/* Total size of all digests */
digests_size += sha_size;
LOG_EVENT(" Digest :");
for (unsigned int j = 0U; j < sha_size; ++j) {
(void)printf(" %02x", *(uint8_t *)ptr++);
if ((j & U(0xF)) == U(0xF)) {
(void)printf("\n");
if (j < (sha_size - 1U)) {
LOG_EVENT("\t\t :");
}
}
}
}
/* TCG_PCR_EVENT2.EventSize */
assert(((uintptr_t)ptr + offsetof(event2_data_t, event)) <= (uintptr_t)end_ptr);
event_size = ((event2_data_t *)ptr)->event_size;
LOG_EVENT(" EventSize : %u\n", event_size);
/* Address of TCG_PCR_EVENT2.Event[EventSize] */
ptr = (uint8_t *)((uintptr_t)ptr + offsetof(event2_data_t, event));
/* End of TCG_PCR_EVENT2.Event[EventSize] */
assert(((uintptr_t)ptr + event_size) <= (uintptr_t)end_ptr);
if ((event_size == sizeof(startup_locality_event_t)) &&
(strcmp((const char *)ptr, TCG_STARTUP_LOCALITY_SIGNATURE) == 0)) {
LOG_EVENT(" Signature : %s\n",
((startup_locality_event_t *)ptr)->signature);
LOG_EVENT(" StartupLocality : %u\n",
((startup_locality_event_t *)ptr)->startup_locality);
} else {
LOG_EVENT(" Event : %s\n", (uint8_t *)ptr);
}
*log_size -= (uintptr_t)ptr + event_size - (uintptr_t)*log_addr;
*log_addr = (uint8_t *)ptr + event_size;
}
#endif /* LOG_LEVEL >= EVENT_LOG_LEVEL */
/*
* Print Event Log
*
* @param[in] log_addr Pointer to Event Log
* @param[in] log_size Event Log size
*/
void dump_event_log(uint8_t *log_addr, size_t log_size)
{
#if LOG_LEVEL >= EVENT_LOG_LEVEL
assert(log_addr != NULL);
/* Print TCG_EfiSpecIDEvent */
id_event_print(&log_addr, &log_size);
while (log_size != 0U) {
event2_print(&log_addr, &log_size);
}
#endif
}
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