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tpm: Move TCG functions into a separate file

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The previous patch is moving the TPM TCG headers in their own file for
a cleaner API. Move the functions in their own file as well.

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Ilias Apalodimas 2024-06-23 14:48:15 +03:00 • committed by Heinrich Schuchardt
parent 27b462cec1
commit a56037a461
5 changed files with 887 additions and 864 deletions
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190
include/tpm-v2.h
View file

@ -399,188 +399,6 @@ enum {
HR_NV_INDEX = TPM_HT_NV_INDEX << HR_SHIFT,
};
/**
* struct tcg2_event_log - Container for managing the platform event log
*
* @log: Address of the log
* @log_position: Current entry position
* @log_size: Log space available
* @found: Boolean indicating if an existing log was discovered
*/
struct tcg2_event_log {
u8 *log;
u32 log_position;
u32 log_size;
bool found;
};
/**
* Create a list of digests of the supported PCR banks for a given input data
*
* @dev TPM device
* @input Data
* @length Length of the data to calculate the digest
* @digest_list List of digests to fill in
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_create_digest(struct udevice *dev, const u8 *input, u32 length,
struct tpml_digest_values *digest_list);
/**
* Get the event size of the specified digests
*
* @digest_list List of digests for the event
*
* Return: Size in bytes of the event
*/
u32 tcg2_event_get_size(struct tpml_digest_values *digest_list);
/**
* tcg2_get_active_pcr_banks
*
* @dev TPM device
* @active_pcr_banks Bitmask of PCR algorithms supported
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_get_active_pcr_banks(struct udevice *dev, u32 *active_pcr_banks);
/**
* tcg2_log_append - Append an event to an event log
*
* @pcr_index Index of the PCR
* @event_type Type of event
* @digest_list List of digests to add
* @size Size of event
* @event Event data
* @log Log buffer to append the event to
*/
void tcg2_log_append(u32 pcr_index, u32 event_type,
struct tpml_digest_values *digest_list, u32 size,
const u8 *event, u8 *log);
/**
* Extend the PCR with specified digests
*
* @dev TPM device
* @pcr_index Index of the PCR
* @digest_list List of digests to extend
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_pcr_extend(struct udevice *dev, u32 pcr_index,
struct tpml_digest_values *digest_list);
/**
* Read the PCR into a list of digests
*
* @dev TPM device
* @pcr_index Index of the PCR
* @digest_list List of digests to extend
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_pcr_read(struct udevice *dev, u32 pcr_index,
struct tpml_digest_values *digest_list);
/**
* Measure data into the TPM PCRs and the platform event log.
*
* @dev TPM device
* @log Platform event log
* @pcr_index Index of the PCR
* @size Size of the data or 0 for event only
* @data Pointer to the data or NULL for event only
* @event_type Event log type
* @event_size Size of the event
* @event Pointer to the event
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_measure_data(struct udevice *dev, struct tcg2_event_log *elog,
u32 pcr_index, u32 size, const u8 *data, u32 event_type,
u32 event_size, const u8 *event);
#define tcg2_measure_event(dev, elog, pcr_index, event_type, size, event) \
tcg2_measure_data(dev, elog, pcr_index, 0, NULL, event_type, size, \
event)
/**
* Prepare the event log buffer. This function tries to discover an existing
* event log in memory from a previous bootloader stage. If such a log exists
* and the PCRs are not extended, the log is "replayed" to extend the PCRs.
* If no log is discovered, create the log header.
*
* @dev TPM device
* @elog Platform event log. The log pointer and log_size
* members must be initialized to either 0 or to a valid
* memory region, in which case any existing log
* discovered will be copied to the specified memory
* region.
* @ignore_existing_log Boolean to indicate whether or not to ignore an
* existing platform log in memory
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_log_prepare_buffer(struct udevice *dev, struct tcg2_event_log *elog,
bool ignore_existing_log);
/**
* Begin measurements.
*
* @dev TPM device
* @elog Platform event log. The log pointer and log_size
* members must be initialized to either 0 or to a valid
* memory region, in which case any existing log
* discovered will be copied to the specified memory
* region.
* @ignore_existing_log Boolean to indicate whether or not to ignore an
* existing platform log in memory
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_measurement_init(struct udevice **dev, struct tcg2_event_log *elog,
bool ignore_existing_log);
/**
* Stop measurements and record separator events.
*
* @dev TPM device
* @elog Platform event log
* @error Boolean to indicate whether an error ocurred or not
*/
void tcg2_measurement_term(struct udevice *dev, struct tcg2_event_log *elog,
bool error);
/**
* Get the platform event log address and size.
*
* @dev TPM device
* @addr Address of the log
* @size Size of the log
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_platform_get_log(struct udevice *dev, void **addr, u32 *size);
/**
* Get the first TPM2 device found.
*
* @dev TPM device
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_platform_get_tpm2(struct udevice **dev);
/**
* Platform-specific function for handling TPM startup errors
*
* @dev TPM device
* @rc The TPM response code
*/
void tcg2_platform_startup_error(struct udevice *dev, int rc);
/**
* Issue a TPM2_Startup command.
*
@ -897,12 +715,4 @@ enum tpm2_algorithms tpm2_name_to_algorithm(const char *name);
*/
const char *tpm2_algorithm_name(enum tpm2_algorithms);
/**
* tpm2_algorithm_to_mask() - Get a TCG hash mask for algorithm
*
* @hash_alg: TCG defined algorithm
* Return: TCG hashing algorithm bitmaps (or 0 if algo not supported)
*/
u32 tpm2_algorithm_to_mask(enum tpm2_algorithms);
#endif /* __TPM_V2_H */

189
include/tpm_tcg2.h
View file

@ -142,5 +142,194 @@ struct tcg_efi_spec_id_event {
#define TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2 2
#define TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2 0
#define TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_ERRATA_TPM2 2
/**
* struct tcg2_event_log - Container for managing the platform event log
*
* @log: Address of the log
* @log_position: Current entry position
* @log_size: Log space available
* @found: Boolean indicating if an existing log was discovered
*/
struct tcg2_event_log {
u8 *log;
u32 log_position;
u32 log_size;
bool found;
};
/**
* Create a list of digests of the supported PCR banks for a given input data
*
* @dev TPM device
* @input Data
* @length Length of the data to calculate the digest
* @digest_list List of digests to fill in
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_create_digest(struct udevice *dev, const u8 *input, u32 length,
struct tpml_digest_values *digest_list);
/**
* Get the event size of the specified digests
*
* @digest_list List of digests for the event
*
* Return: Size in bytes of the event
*/
u32 tcg2_event_get_size(struct tpml_digest_values *digest_list);
/**
* tcg2_get_active_pcr_banks
*
* @dev TPM device
* @active_pcr_banks Bitmask of PCR algorithms supported
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_get_active_pcr_banks(struct udevice *dev, u32 *active_pcr_banks);
/**
* tcg2_log_append - Append an event to an event log
*
* @pcr_index Index of the PCR
* @event_type Type of event
* @digest_list List of digests to add
* @size Size of event
* @event Event data
* @log Log buffer to append the event to
*/
void tcg2_log_append(u32 pcr_index, u32 event_type,
struct tpml_digest_values *digest_list, u32 size,
const u8 *event, u8 *log);
/**
* Extend the PCR with specified digests
*
* @dev TPM device
* @pcr_index Index of the PCR
* @digest_list List of digests to extend
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_pcr_extend(struct udevice *dev, u32 pcr_index,
struct tpml_digest_values *digest_list);
/**
* Read the PCR into a list of digests
*
* @dev TPM device
* @pcr_index Index of the PCR
* @digest_list List of digests to extend
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_pcr_read(struct udevice *dev, u32 pcr_index,
struct tpml_digest_values *digest_list);
/**
* Measure data into the TPM PCRs and the platform event log.
*
* @dev TPM device
* @log Platform event log
* @pcr_index Index of the PCR
* @size Size of the data or 0 for event only
* @data Pointer to the data or NULL for event only
* @event_type Event log type
* @event_size Size of the event
* @event Pointer to the event
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_measure_data(struct udevice *dev, struct tcg2_event_log *elog,
u32 pcr_index, u32 size, const u8 *data, u32 event_type,
u32 event_size, const u8 *event);
#define tcg2_measure_event(dev, elog, pcr_index, event_type, size, event) \
tcg2_measure_data(dev, elog, pcr_index, 0, NULL, event_type, size, \
event)
/**
* Prepare the event log buffer. This function tries to discover an existing
* event log in memory from a previous bootloader stage. If such a log exists
* and the PCRs are not extended, the log is "replayed" to extend the PCRs.
* If no log is discovered, create the log header.
*
* @dev TPM device
* @elog Platform event log. The log pointer and log_size
* members must be initialized to either 0 or to a valid
* memory region, in which case any existing log
* discovered will be copied to the specified memory
* region.
* @ignore_existing_log Boolean to indicate whether or not to ignore an
* existing platform log in memory
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_log_prepare_buffer(struct udevice *dev, struct tcg2_event_log *elog,
bool ignore_existing_log);
/**
* Begin measurements.
*
* @dev TPM device
* @elog Platform event log. The log pointer and log_size
* members must be initialized to either 0 or to a valid
* memory region, in which case any existing log
* discovered will be copied to the specified memory
* region.
* @ignore_existing_log Boolean to indicate whether or not to ignore an
* existing platform log in memory
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_measurement_init(struct udevice **dev, struct tcg2_event_log *elog,
bool ignore_existing_log);
/**
* Stop measurements and record separator events.
*
* @dev TPM device
* @elog Platform event log
* @error Boolean to indicate whether an error ocurred or not
*/
void tcg2_measurement_term(struct udevice *dev, struct tcg2_event_log *elog,
bool error);
/**
* Get the platform event log address and size.
*
* @dev TPM device
* @addr Address of the log
* @size Size of the log
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_platform_get_log(struct udevice *dev, void **addr, u32 *size);
/**
* Get the first TPM2 device found.
*
* @dev TPM device
*
* Return: zero on success, negative errno otherwise
*/
int tcg2_platform_get_tpm2(struct udevice **dev);
/**
* Platform-specific function for handling TPM startup errors
*
* @dev TPM device
* @rc The TPM response code
*/
void tcg2_platform_startup_error(struct udevice *dev, int rc);
/**
* tcg2_algorithm_to_mask() - Get a TCG hash mask for algorithm
*
* @hash_alg: TCG defined algorithm
* Return: TCG hashing algorithm bitmaps (or 0 if algo not supported)
*/
u32 tcg2_algorithm_to_mask(enum tpm2_algorithms);
#endif /* __TPM_TCG_V2_H */

2
lib/Makefile
View file

@ -61,6 +61,8 @@ ifeq ($(CONFIG_$(SPL_TPL_)TPM),y)
obj-$(CONFIG_TPM) += tpm_api.o
obj-$(CONFIG_TPM_V1) += tpm-v1.o
obj-$(CONFIG_TPM_V2) += tpm-v2.o
obj-$(CONFIG_EFI_TCG2_PROTOCOL) += tpm_tcg2.o
obj-$(CONFIG_MEASURED_BOOT) += tpm_tcg2.o
endif
obj-$(CONFIG_$(SPL_TPL_)CRC8) += crc8.o

675
lib/tpm-v2.c
View file

@ -23,668 +23,6 @@
#include "tpm-utils.h"
int tcg2_get_active_pcr_banks(struct udevice *dev, u32 *active_pcr_banks)
{
u32 supported = 0;
u32 pcr_banks = 0;
u32 active = 0;
int rc;
rc = tpm2_get_pcr_info(dev, &supported, &active, &pcr_banks);
if (rc)
return rc;
*active_pcr_banks = active;
return 0;
}
u32 tcg2_event_get_size(struct tpml_digest_values *digest_list)
{
u32 len;
size_t i;
len = offsetof(struct tcg_pcr_event2, digests);
len += offsetof(struct tpml_digest_values, digests);
for (i = 0; i < digest_list->count; ++i) {
u16 l = tpm2_algorithm_to_len(digest_list->digests[i].hash_alg);
if (!l)
continue;
len += l + offsetof(struct tpmt_ha, digest);
}
len += sizeof(u32);
return len;
}
int tcg2_create_digest(struct udevice *dev, const u8 *input, u32 length,
struct tpml_digest_values *digest_list)
{
u8 final[sizeof(union tpmu_ha)];
sha256_context ctx_256;
sha512_context ctx_512;
sha1_context ctx;
u32 active;
size_t i;
u32 len;
int rc;
rc = tcg2_get_active_pcr_banks(dev, &active);
if (rc)
return rc;
digest_list->count = 0;
for (i = 0; i < ARRAY_SIZE(hash_algo_list); ++i) {
if (!(active & hash_algo_list[i].hash_mask))
continue;
switch (hash_algo_list[i].hash_alg) {
case TPM2_ALG_SHA1:
sha1_starts(&ctx);
sha1_update(&ctx, input, length);
sha1_finish(&ctx, final);
len = TPM2_SHA1_DIGEST_SIZE;
break;
case TPM2_ALG_SHA256:
sha256_starts(&ctx_256);
sha256_update(&ctx_256, input, length);
sha256_finish(&ctx_256, final);
len = TPM2_SHA256_DIGEST_SIZE;
break;
case TPM2_ALG_SHA384:
sha384_starts(&ctx_512);
sha384_update(&ctx_512, input, length);
sha384_finish(&ctx_512, final);
len = TPM2_SHA384_DIGEST_SIZE;
break;
case TPM2_ALG_SHA512:
sha512_starts(&ctx_512);
sha512_update(&ctx_512, input, length);
sha512_finish(&ctx_512, final);
len = TPM2_SHA512_DIGEST_SIZE;
break;
default:
printf("%s: unsupported algorithm %x\n", __func__,
hash_algo_list[i].hash_alg);
continue;
}
digest_list->digests[digest_list->count].hash_alg =
hash_algo_list[i].hash_alg;
memcpy(&digest_list->digests[digest_list->count].digest, final,
len);
digest_list->count++;
}
return 0;
}
void tcg2_log_append(u32 pcr_index, u32 event_type,
struct tpml_digest_values *digest_list, u32 size,
const u8 *event, u8 *log)
{
size_t len;
size_t pos;
u32 i;
pos = offsetof(struct tcg_pcr_event2, pcr_index);
put_unaligned_le32(pcr_index, log);
pos = offsetof(struct tcg_pcr_event2, event_type);
put_unaligned_le32(event_type, log + pos);
pos = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, count);
put_unaligned_le32(digest_list->count, log + pos);
pos = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, digests);
for (i = 0; i < digest_list->count; ++i) {
u16 hash_alg = digest_list->digests[i].hash_alg;
len = tpm2_algorithm_to_len(hash_alg);
if (!len)
continue;
pos += offsetof(struct tpmt_ha, hash_alg);
put_unaligned_le16(hash_alg, log + pos);
pos += offsetof(struct tpmt_ha, digest);
memcpy(log + pos, (u8 *)&digest_list->digests[i].digest, len);
pos += len;
}
put_unaligned_le32(size, log + pos);
pos += sizeof(u32);
memcpy(log + pos, event, size);
}
static int tcg2_log_append_check(struct tcg2_event_log *elog, u32 pcr_index,
u32 event_type,
struct tpml_digest_values *digest_list,
u32 size, const u8 *event)
{
u32 event_size;
u8 *log;
event_size = size + tcg2_event_get_size(digest_list);
if (elog->log_position + event_size > elog->log_size) {
printf("%s: log too large: %u + %u > %u\n", __func__,
elog->log_position, event_size, elog->log_size);
return -ENOBUFS;
}
log = elog->log + elog->log_position;
elog->log_position += event_size;
tcg2_log_append(pcr_index, event_type, digest_list, size, event, log);
return 0;
}
static int tcg2_log_init(struct udevice *dev, struct tcg2_event_log *elog)
{
struct tcg_efi_spec_id_event *ev;
struct tcg_pcr_event *log;
u32 event_size;
u32 count = 0;
u32 log_size;
u32 active;
size_t i;
u16 len;
int rc;
rc = tcg2_get_active_pcr_banks(dev, &active);
if (rc)
return rc;
event_size = offsetof(struct tcg_efi_spec_id_event, digest_sizes);
for (i = 0; i < ARRAY_SIZE(hash_algo_list); ++i) {
if (!(active & hash_algo_list[i].hash_mask))
continue;
switch (hash_algo_list[i].hash_alg) {
case TPM2_ALG_SHA1:
case TPM2_ALG_SHA256:
case TPM2_ALG_SHA384:
case TPM2_ALG_SHA512:
count++;
break;
default:
continue;
}
}
event_size += 1 +
(sizeof(struct tcg_efi_spec_id_event_algorithm_size) * count);
log_size = offsetof(struct tcg_pcr_event, event) + event_size;
if (log_size > elog->log_size) {
printf("%s: log too large: %u > %u\n", __func__, log_size,
elog->log_size);
return -ENOBUFS;
}
log = (struct tcg_pcr_event *)elog->log;
put_unaligned_le32(0, &log->pcr_index);
put_unaligned_le32(EV_NO_ACTION, &log->event_type);
memset(&log->digest, 0, sizeof(log->digest));
put_unaligned_le32(event_size, &log->event_size);
ev = (struct tcg_efi_spec_id_event *)log->event;
strlcpy((char *)ev->signature, TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03,
sizeof(ev->signature));
put_unaligned_le32(0, &ev->platform_class);
ev->spec_version_minor = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2;
ev->spec_version_major = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2;
ev->spec_errata = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_ERRATA_TPM2;
ev->uintn_size = sizeof(size_t) / sizeof(u32);
put_unaligned_le32(count, &ev->number_of_algorithms);
count = 0;
for (i = 0; i < ARRAY_SIZE(hash_algo_list); ++i) {
if (!(active & hash_algo_list[i].hash_mask))
continue;
len = hash_algo_list[i].hash_len;
if (!len)
continue;
put_unaligned_le16(hash_algo_list[i].hash_alg,
&ev->digest_sizes[count].algorithm_id);
put_unaligned_le16(len, &ev->digest_sizes[count].digest_size);
count++;
}
*((u8 *)ev + (event_size - 1)) = 0;
elog->log_position = log_size;
return 0;
}
static int tcg2_replay_eventlog(struct tcg2_event_log *elog,
struct udevice *dev,
struct tpml_digest_values *digest_list,
u32 log_position)
{
const u32 offset = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, digests);
u32 event_size;
u32 count;
u16 algo;
u32 pcr;
u32 pos;
u16 len;
u8 *log;
int rc;
u32 i;
while (log_position + offset < elog->log_size) {
log = elog->log + log_position;
pos = offsetof(struct tcg_pcr_event2, pcr_index);
pcr = get_unaligned_le32(log + pos);
pos = offsetof(struct tcg_pcr_event2, event_type);
if (!get_unaligned_le32(log + pos))
return 0;
pos = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, count);
count = get_unaligned_le32(log + pos);
if (count > ARRAY_SIZE(hash_algo_list) ||
(digest_list->count && digest_list->count != count))
return 0;
pos = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, digests);
for (i = 0; i < count; ++i) {
pos += offsetof(struct tpmt_ha, hash_alg);
if (log_position + pos + sizeof(u16) >= elog->log_size)
return 0;
algo = get_unaligned_le16(log + pos);
pos += offsetof(struct tpmt_ha, digest);
switch (algo) {
case TPM2_ALG_SHA1:
case TPM2_ALG_SHA256:
case TPM2_ALG_SHA384:
case TPM2_ALG_SHA512:
len = tpm2_algorithm_to_len(algo);
break;
default:
return 0;
}
if (digest_list->count) {
if (algo != digest_list->digests[i].hash_alg ||
log_position + pos + len >= elog->log_size)
return 0;
memcpy(digest_list->digests[i].digest.sha512,
log + pos, len);
}
pos += len;
}
if (log_position + pos + sizeof(u32) >= elog->log_size)
return 0;
event_size = get_unaligned_le32(log + pos);
pos += event_size + sizeof(u32);
if (log_position + pos > elog->log_size)
return 0;
if (digest_list->count) {
rc = tcg2_pcr_extend(dev, pcr, digest_list);
if (rc)
return rc;
}
log_position += pos;
}
elog->log_position = log_position;
elog->found = true;
return 0;
}
static int tcg2_log_parse(struct udevice *dev, struct tcg2_event_log *elog)
{
struct tpml_digest_values digest_list;
struct tcg_efi_spec_id_event *event;
struct tcg_pcr_event *log;
u32 log_active;
u32 calc_size;
u32 active;
u32 count;
u32 evsz;
u32 mask;
u16 algo;
u16 len;
int rc;
u32 i;
u16 j;
if (elog->log_size <= offsetof(struct tcg_pcr_event, event))
return 0;
log = (struct tcg_pcr_event *)elog->log;
if (get_unaligned_le32(&log->pcr_index) != 0 ||
get_unaligned_le32(&log->event_type) != EV_NO_ACTION)
return 0;
for (i = 0; i < sizeof(log->digest); i++) {
if (log->digest[i])
return 0;
}
evsz = get_unaligned_le32(&log->event_size);
if (evsz < offsetof(struct tcg_efi_spec_id_event, digest_sizes) ||
evsz + offsetof(struct tcg_pcr_event, event) > elog->log_size)
return 0;
event = (struct tcg_efi_spec_id_event *)log->event;
if (memcmp(event->signature, TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03,
sizeof(TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03)))
return 0;
if (event->spec_version_minor != TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2 ||
event->spec_version_major != TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2)
return 0;
count = get_unaligned_le32(&event->number_of_algorithms);
if (count > ARRAY_SIZE(hash_algo_list))
return 0;
calc_size = offsetof(struct tcg_efi_spec_id_event, digest_sizes) +
(sizeof(struct tcg_efi_spec_id_event_algorithm_size) * count) +
1;
if (evsz != calc_size)
return 0;
rc = tcg2_get_active_pcr_banks(dev, &active);
if (rc)
return rc;
digest_list.count = 0;
log_active = 0;
for (i = 0; i < count; ++i) {
algo = get_unaligned_le16(&event->digest_sizes[i].algorithm_id);
mask = tpm2_algorithm_to_mask(algo);
if (!(active & mask))
return 0;
switch (algo) {
case TPM2_ALG_SHA1:
case TPM2_ALG_SHA256:
case TPM2_ALG_SHA384:
case TPM2_ALG_SHA512:
len = get_unaligned_le16(&event->digest_sizes[i].digest_size);
if (tpm2_algorithm_to_len(algo) != len)
return 0;
digest_list.digests[digest_list.count++].hash_alg = algo;
break;
default:
return 0;
}
log_active |= mask;
}
/* Ensure the previous firmware extended all the PCRs. */
if (log_active != active)
return 0;
/* Read PCR0 to check if previous firmware extended the PCRs or not. */
rc = tcg2_pcr_read(dev, 0, &digest_list);
if (rc)
return rc;
for (i = 0; i < digest_list.count; ++i) {
len = tpm2_algorithm_to_len(digest_list.digests[i].hash_alg);
for (j = 0; j < len; ++j) {
if (digest_list.digests[i].digest.sha512[j])
break;
}
/* PCR is non-zero; it has been extended, so skip extending. */
if (j != len) {
digest_list.count = 0;
break;
}
}
return tcg2_replay_eventlog(elog, dev, &digest_list,
offsetof(struct tcg_pcr_event, event) +
evsz);
}
int tcg2_pcr_extend(struct udevice *dev, u32 pcr_index,
struct tpml_digest_values *digest_list)
{
u32 rc;
u32 i;
for (i = 0; i < digest_list->count; i++) {
u32 alg = digest_list->digests[i].hash_alg;
rc = tpm2_pcr_extend(dev, pcr_index, alg,
(u8 *)&digest_list->digests[i].digest,
tpm2_algorithm_to_len(alg));
if (rc) {
printf("%s: error pcr:%u alg:%08x\n", __func__,
pcr_index, alg);
return rc;
}
}
return 0;
}
int tcg2_pcr_read(struct udevice *dev, u32 pcr_index,
struct tpml_digest_values *digest_list)
{
struct tpm_chip_priv *priv;
u32 rc;
u32 i;
priv = dev_get_uclass_priv(dev);
if (!priv)
return -ENODEV;
for (i = 0; i < digest_list->count; i++) {
u32 alg = digest_list->digests[i].hash_alg;
u8 *digest = (u8 *)&digest_list->digests[i].digest;
rc = tpm2_pcr_read(dev, pcr_index, priv->pcr_select_min, alg,
digest, tpm2_algorithm_to_len(alg), NULL);
if (rc) {
printf("%s: error pcr:%u alg:%08x\n", __func__,
pcr_index, alg);
return rc;
}
}
return 0;
}
int tcg2_measure_data(struct udevice *dev, struct tcg2_event_log *elog,
u32 pcr_index, u32 size, const u8 *data, u32 event_type,
u32 event_size, const u8 *event)
{
struct tpml_digest_values digest_list;
int rc;
if (data)
rc = tcg2_create_digest(dev, data, size, &digest_list);
else
rc = tcg2_create_digest(dev, event, event_size, &digest_list);
if (rc)
return rc;
rc = tcg2_pcr_extend(dev, pcr_index, &digest_list);
if (rc)
return rc;
return tcg2_log_append_check(elog, pcr_index, event_type, &digest_list,
event_size, event);
}
int tcg2_log_prepare_buffer(struct udevice *dev, struct tcg2_event_log *elog,
bool ignore_existing_log)
{
struct tcg2_event_log log;
int rc;
elog->log_position = 0;
elog->found = false;
rc = tcg2_platform_get_log(dev, (void **)&log.log, &log.log_size);
if (!rc) {
log.log_position = 0;
log.found = false;
if (!ignore_existing_log) {
rc = tcg2_log_parse(dev, &log);
if (rc)
return rc;
}
if (elog->log_size) {
if (log.found) {
if (elog->log_size < log.log_position)
return -ENOBUFS;
/*
* Copy the discovered log into the user buffer
* if there's enough space.
*/
memcpy(elog->log, log.log, log.log_position);
}
unmap_physmem(log.log, MAP_NOCACHE);
} else {
elog->log = log.log;
elog->log_size = log.log_size;
}
elog->log_position = log.log_position;
elog->found = log.found;
}
/*
* Initialize the log buffer if no log was discovered and the buffer is
* valid. User's can pass in their own buffer as a fallback if no
* memory region is found.
*/
if (!elog->found && elog->log_size)
rc = tcg2_log_init(dev, elog);
return rc;
}
int tcg2_measurement_init(struct udevice **dev, struct tcg2_event_log *elog,
bool ignore_existing_log)
{
int rc;
rc = tcg2_platform_get_tpm2(dev);
if (rc)
return rc;
rc = tpm_auto_start(*dev);
if (rc)
return rc;
rc = tcg2_log_prepare_buffer(*dev, elog, ignore_existing_log);
if (rc) {
tcg2_measurement_term(*dev, elog, true);
return rc;
}
rc = tcg2_measure_event(*dev, elog, 0, EV_S_CRTM_VERSION,
strlen(version_string) + 1,
(u8 *)version_string);
if (rc) {
tcg2_measurement_term(*dev, elog, true);
return rc;
}
return 0;
}
void tcg2_measurement_term(struct udevice *dev, struct tcg2_event_log *elog,
bool error)
{
u32 event = error ? 0x1 : 0xffffffff;
int i;
for (i = 0; i < 8; ++i)
tcg2_measure_event(dev, elog, i, EV_SEPARATOR, sizeof(event),
(const u8 *)&event);
if (elog->log)
unmap_physmem(elog->log, MAP_NOCACHE);
}
__weak int tcg2_platform_get_log(struct udevice *dev, void **addr, u32 *size)
{
const __be32 *addr_prop;
const __be32 *size_prop;
int asize;
int ssize;
*addr = NULL;
*size = 0;
addr_prop = dev_read_prop(dev, "tpm_event_log_addr", &asize);
if (!addr_prop)
addr_prop = dev_read_prop(dev, "linux,sml-base", &asize);
size_prop = dev_read_prop(dev, "tpm_event_log_size", &ssize);
if (!size_prop)
size_prop = dev_read_prop(dev, "linux,sml-size", &ssize);
if (addr_prop && size_prop) {
u64 a = of_read_number(addr_prop, asize / sizeof(__be32));
u64 s = of_read_number(size_prop, ssize / sizeof(__be32));
*addr = map_physmem(a, s, MAP_NOCACHE);
*size = (u32)s;
} else {
struct ofnode_phandle_args args;
phys_addr_t a;
fdt_size_t s;
if (dev_read_phandle_with_args(dev, "memory-region", NULL, 0,
0, &args))
return -ENODEV;
a = ofnode_get_addr_size(args.node, "reg", &s);
if (a == FDT_ADDR_T_NONE)
return -ENOMEM;
*addr = map_physmem(a, s, MAP_NOCACHE);
*size = (u32)s;
}
return 0;
}
__weak int tcg2_platform_get_tpm2(struct udevice **dev)
{
for_each_tpm_device(*dev) {
if (tpm_get_version(*dev) == TPM_V2)
return 0;
}
return -ENODEV;
}
__weak void tcg2_platform_startup_error(struct udevice *dev, int rc) {}
u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode)
{
const u8 command_v2[12] = {
@ -1141,7 +479,7 @@ int tpm2_get_pcr_info(struct udevice *dev, u32 *supported_pcr, u32 *active_pcr,
}
for (i = 0; i < pcrs.count; i++) {
u32 hash_mask = tpm2_algorithm_to_mask(pcrs.selection[i].hash);
u32 hash_mask = tcg2_algorithm_to_mask(pcrs.selection[i].hash);
if (hash_mask) {
*supported_pcr |= hash_mask;
@ -1567,14 +905,3 @@ const char *tpm2_algorithm_name(enum tpm2_algorithms algo)
return "";
}
u32 tpm2_algorithm_to_mask(enum tpm2_algorithms algo)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(hash_algo_list); i++) {
if (hash_algo_list[i].hash_alg == algo)
return hash_algo_list[i].hash_mask;
}
return 0;
}

695
lib/tpm_tcg2.c Normal file
View file

@ -0,0 +1,695 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2023 Linaro Limited
*/
#include <dm.h>
#include <dm/of_access.h>
#include <tpm_api.h>
#include <tpm-common.h>
#include <tpm-v2.h>
#include <tpm_tcg2.h>
#include <u-boot/sha1.h>
#include <u-boot/sha256.h>
#include <u-boot/sha512.h>
#include <version_string.h>
#include <asm/io.h>
#include <linux/bitops.h>
#include <linux/unaligned/be_byteshift.h>
#include <linux/unaligned/generic.h>
#include <linux/unaligned/le_byteshift.h>
#include "tpm-utils.h"
int tcg2_get_active_pcr_banks(struct udevice *dev, u32 *active_pcr_banks)
{
u32 supported = 0;
u32 pcr_banks = 0;
u32 active = 0;
int rc;
rc = tpm2_get_pcr_info(dev, &supported, &active, &pcr_banks);
if (rc)
return rc;
*active_pcr_banks = active;
return 0;
}
u32 tcg2_event_get_size(struct tpml_digest_values *digest_list)
{
u32 len;
size_t i;
len = offsetof(struct tcg_pcr_event2, digests);
len += offsetof(struct tpml_digest_values, digests);
for (i = 0; i < digest_list->count; ++i) {
u16 l = tpm2_algorithm_to_len(digest_list->digests[i].hash_alg);
if (!l)
continue;
len += l + offsetof(struct tpmt_ha, digest);
}
len += sizeof(u32);
return len;
}
int tcg2_create_digest(struct udevice *dev, const u8 *input, u32 length,
struct tpml_digest_values *digest_list)
{
u8 final[sizeof(union tpmu_ha)];
sha256_context ctx_256;
sha512_context ctx_512;
sha1_context ctx;
u32 active;
size_t i;
u32 len;
int rc;
rc = tcg2_get_active_pcr_banks(dev, &active);
if (rc)
return rc;
digest_list->count = 0;
for (i = 0; i < ARRAY_SIZE(hash_algo_list); ++i) {
if (!(active & hash_algo_list[i].hash_mask))
continue;
switch (hash_algo_list[i].hash_alg) {
case TPM2_ALG_SHA1:
sha1_starts(&ctx);
sha1_update(&ctx, input, length);
sha1_finish(&ctx, final);
len = TPM2_SHA1_DIGEST_SIZE;
break;
case TPM2_ALG_SHA256:
sha256_starts(&ctx_256);
sha256_update(&ctx_256, input, length);
sha256_finish(&ctx_256, final);
len = TPM2_SHA256_DIGEST_SIZE;
break;
case TPM2_ALG_SHA384:
sha384_starts(&ctx_512);
sha384_update(&ctx_512, input, length);
sha384_finish(&ctx_512, final);
len = TPM2_SHA384_DIGEST_SIZE;
break;
case TPM2_ALG_SHA512:
sha512_starts(&ctx_512);
sha512_update(&ctx_512, input, length);
sha512_finish(&ctx_512, final);
len = TPM2_SHA512_DIGEST_SIZE;
break;
default:
printf("%s: unsupported algorithm %x\n", __func__,
hash_algo_list[i].hash_alg);
continue;
}
digest_list->digests[digest_list->count].hash_alg =
hash_algo_list[i].hash_alg;
memcpy(&digest_list->digests[digest_list->count].digest, final,
len);
digest_list->count++;
}
return 0;
}
void tcg2_log_append(u32 pcr_index, u32 event_type,
struct tpml_digest_values *digest_list, u32 size,
const u8 *event, u8 *log)
{
size_t len;
size_t pos;
u32 i;
pos = offsetof(struct tcg_pcr_event2, pcr_index);
put_unaligned_le32(pcr_index, log);
pos = offsetof(struct tcg_pcr_event2, event_type);
put_unaligned_le32(event_type, log + pos);
pos = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, count);
put_unaligned_le32(digest_list->count, log + pos);
pos = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, digests);
for (i = 0; i < digest_list->count; ++i) {
u16 hash_alg = digest_list->digests[i].hash_alg;
len = tpm2_algorithm_to_len(hash_alg);
if (!len)
continue;
pos += offsetof(struct tpmt_ha, hash_alg);
put_unaligned_le16(hash_alg, log + pos);
pos += offsetof(struct tpmt_ha, digest);
memcpy(log + pos, (u8 *)&digest_list->digests[i].digest, len);
pos += len;
}
put_unaligned_le32(size, log + pos);
pos += sizeof(u32);
memcpy(log + pos, event, size);
}
static int tcg2_log_append_check(struct tcg2_event_log *elog, u32 pcr_index,
u32 event_type,
struct tpml_digest_values *digest_list,
u32 size, const u8 *event)
{
u32 event_size;
u8 *log;
event_size = size + tcg2_event_get_size(digest_list);
if (elog->log_position + event_size > elog->log_size) {
printf("%s: log too large: %u + %u > %u\n", __func__,
elog->log_position, event_size, elog->log_size);
return -ENOBUFS;
}
log = elog->log + elog->log_position;
elog->log_position += event_size;
tcg2_log_append(pcr_index, event_type, digest_list, size, event, log);
return 0;
}
static int tcg2_log_init(struct udevice *dev, struct tcg2_event_log *elog)
{
struct tcg_efi_spec_id_event *ev;
struct tcg_pcr_event *log;
u32 event_size;
u32 count = 0;
u32 log_size;
u32 active;
size_t i;
u16 len;
int rc;
rc = tcg2_get_active_pcr_banks(dev, &active);
if (rc)
return rc;
event_size = offsetof(struct tcg_efi_spec_id_event, digest_sizes);
for (i = 0; i < ARRAY_SIZE(hash_algo_list); ++i) {
if (!(active & hash_algo_list[i].hash_mask))
continue;
switch (hash_algo_list[i].hash_alg) {
case TPM2_ALG_SHA1:
case TPM2_ALG_SHA256:
case TPM2_ALG_SHA384:
case TPM2_ALG_SHA512:
count++;
break;
default:
continue;
}
}
event_size += 1 +
(sizeof(struct tcg_efi_spec_id_event_algorithm_size) * count);
log_size = offsetof(struct tcg_pcr_event, event) + event_size;
if (log_size > elog->log_size) {
printf("%s: log too large: %u > %u\n", __func__, log_size,
elog->log_size);
return -ENOBUFS;
}
log = (struct tcg_pcr_event *)elog->log;
put_unaligned_le32(0, &log->pcr_index);
put_unaligned_le32(EV_NO_ACTION, &log->event_type);
memset(&log->digest, 0, sizeof(log->digest));
put_unaligned_le32(event_size, &log->event_size);
ev = (struct tcg_efi_spec_id_event *)log->event;
strlcpy((char *)ev->signature, TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03,
sizeof(ev->signature));
put_unaligned_le32(0, &ev->platform_class);
ev->spec_version_minor = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2;
ev->spec_version_major = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2;
ev->spec_errata = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_ERRATA_TPM2;
ev->uintn_size = sizeof(size_t) / sizeof(u32);
put_unaligned_le32(count, &ev->number_of_algorithms);
count = 0;
for (i = 0; i < ARRAY_SIZE(hash_algo_list); ++i) {
if (!(active & hash_algo_list[i].hash_mask))
continue;
len = hash_algo_list[i].hash_len;
if (!len)
continue;
put_unaligned_le16(hash_algo_list[i].hash_alg,
&ev->digest_sizes[count].algorithm_id);
put_unaligned_le16(len, &ev->digest_sizes[count].digest_size);
count++;
}
*((u8 *)ev + (event_size - 1)) = 0;
elog->log_position = log_size;
return 0;
}
static int tcg2_replay_eventlog(struct tcg2_event_log *elog,
struct udevice *dev,
struct tpml_digest_values *digest_list,
u32 log_position)
{
const u32 offset = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, digests);
u32 event_size;
u32 count;
u16 algo;
u32 pcr;
u32 pos;
u16 len;
u8 *log;
int rc;
u32 i;
while (log_position + offset < elog->log_size) {
log = elog->log + log_position;
pos = offsetof(struct tcg_pcr_event2, pcr_index);
pcr = get_unaligned_le32(log + pos);
pos = offsetof(struct tcg_pcr_event2, event_type);
if (!get_unaligned_le32(log + pos))
return 0;
pos = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, count);
count = get_unaligned_le32(log + pos);
if (count > ARRAY_SIZE(hash_algo_list) ||
(digest_list->count && digest_list->count != count))
return 0;
pos = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, digests);
for (i = 0; i < count; ++i) {
pos += offsetof(struct tpmt_ha, hash_alg);
if (log_position + pos + sizeof(u16) >= elog->log_size)
return 0;
algo = get_unaligned_le16(log + pos);
pos += offsetof(struct tpmt_ha, digest);
switch (algo) {
case TPM2_ALG_SHA1:
case TPM2_ALG_SHA256:
case TPM2_ALG_SHA384:
case TPM2_ALG_SHA512:
len = tpm2_algorithm_to_len(algo);
break;
default:
return 0;
}
if (digest_list->count) {
if (algo != digest_list->digests[i].hash_alg ||
log_position + pos + len >= elog->log_size)
return 0;
memcpy(digest_list->digests[i].digest.sha512,
log + pos, len);
}
pos += len;
}
if (log_position + pos + sizeof(u32) >= elog->log_size)
return 0;
event_size = get_unaligned_le32(log + pos);
pos += event_size + sizeof(u32);
if (log_position + pos > elog->log_size)
return 0;
if (digest_list->count) {
rc = tcg2_pcr_extend(dev, pcr, digest_list);
if (rc)
return rc;
}
log_position += pos;
}
elog->log_position = log_position;
elog->found = true;
return 0;
}
static int tcg2_log_parse(struct udevice *dev, struct tcg2_event_log *elog)
{
struct tpml_digest_values digest_list;
struct tcg_efi_spec_id_event *event;
struct tcg_pcr_event *log;
u32 log_active;
u32 calc_size;
u32 active;
u32 count;
u32 evsz;
u32 mask;
u16 algo;
u16 len;
int rc;
u32 i;
u16 j;
if (elog->log_size <= offsetof(struct tcg_pcr_event, event))
return 0;
log = (struct tcg_pcr_event *)elog->log;
if (get_unaligned_le32(&log->pcr_index) != 0 ||
get_unaligned_le32(&log->event_type) != EV_NO_ACTION)
return 0;
for (i = 0; i < sizeof(log->digest); i++) {
if (log->digest[i])
return 0;
}
evsz = get_unaligned_le32(&log->event_size);
if (evsz < offsetof(struct tcg_efi_spec_id_event, digest_sizes) ||
evsz + offsetof(struct tcg_pcr_event, event) > elog->log_size)
return 0;
event = (struct tcg_efi_spec_id_event *)log->event;
if (memcmp(event->signature, TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03,
sizeof(TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03)))
return 0;
if (event->spec_version_minor != TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2 ||
event->spec_version_major != TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2)
return 0;
count = get_unaligned_le32(&event->number_of_algorithms);
if (count > ARRAY_SIZE(hash_algo_list))
return 0;
calc_size = offsetof(struct tcg_efi_spec_id_event, digest_sizes) +
(sizeof(struct tcg_efi_spec_id_event_algorithm_size) * count) +
1;
if (evsz != calc_size)
return 0;
rc = tcg2_get_active_pcr_banks(dev, &active);
if (rc)
return rc;
digest_list.count = 0;
log_active = 0;
for (i = 0; i < count; ++i) {
algo = get_unaligned_le16(&event->digest_sizes[i].algorithm_id);
mask = tcg2_algorithm_to_mask(algo);
if (!(active & mask))
return 0;
switch (algo) {
case TPM2_ALG_SHA1:
case TPM2_ALG_SHA256:
case TPM2_ALG_SHA384:
case TPM2_ALG_SHA512:
len = get_unaligned_le16(&event->digest_sizes[i].digest_size);
if (tpm2_algorithm_to_len(algo) != len)
return 0;
digest_list.digests[digest_list.count++].hash_alg = algo;
break;
default:
return 0;
}
log_active |= mask;
}
/* Ensure the previous firmware extended all the PCRs. */
if (log_active != active)
return 0;
/* Read PCR0 to check if previous firmware extended the PCRs or not. */
rc = tcg2_pcr_read(dev, 0, &digest_list);
if (rc)
return rc;
for (i = 0; i < digest_list.count; ++i) {
len = tpm2_algorithm_to_len(digest_list.digests[i].hash_alg);
for (j = 0; j < len; ++j) {
if (digest_list.digests[i].digest.sha512[j])
break;
}
/* PCR is non-zero; it has been extended, so skip extending. */
if (j != len) {
digest_list.count = 0;
break;
}
}
return tcg2_replay_eventlog(elog, dev, &digest_list,
offsetof(struct tcg_pcr_event, event) +
evsz);
}
int tcg2_pcr_extend(struct udevice *dev, u32 pcr_index,
struct tpml_digest_values *digest_list)
{
u32 rc;
u32 i;
for (i = 0; i < digest_list->count; i++) {
u32 alg = digest_list->digests[i].hash_alg;
rc = tpm2_pcr_extend(dev, pcr_index, alg,
(u8 *)&digest_list->digests[i].digest,
tpm2_algorithm_to_len(alg));
if (rc) {
printf("%s: error pcr:%u alg:%08x\n", __func__,
pcr_index, alg);
return rc;
}
}
return 0;
}
int tcg2_pcr_read(struct udevice *dev, u32 pcr_index,
struct tpml_digest_values *digest_list)
{
struct tpm_chip_priv *priv;
u32 rc;
u32 i;
priv = dev_get_uclass_priv(dev);
if (!priv)
return -ENODEV;
for (i = 0; i < digest_list->count; i++) {
u32 alg = digest_list->digests[i].hash_alg;
u8 *digest = (u8 *)&digest_list->digests[i].digest;
rc = tpm2_pcr_read(dev, pcr_index, priv->pcr_select_min, alg,
digest, tpm2_algorithm_to_len(alg), NULL);
if (rc) {
printf("%s: error pcr:%u alg:%08x\n", __func__,
pcr_index, alg);
return rc;
}
}
return 0;
}
int tcg2_measure_data(struct udevice *dev, struct tcg2_event_log *elog,
u32 pcr_index, u32 size, const u8 *data, u32 event_type,
u32 event_size, const u8 *event)
{
struct tpml_digest_values digest_list;
int rc;
if (data)
rc = tcg2_create_digest(dev, data, size, &digest_list);
else
rc = tcg2_create_digest(dev, event, event_size, &digest_list);
if (rc)
return rc;
rc = tcg2_pcr_extend(dev, pcr_index, &digest_list);
if (rc)
return rc;
return tcg2_log_append_check(elog, pcr_index, event_type, &digest_list,
event_size, event);
}
int tcg2_log_prepare_buffer(struct udevice *dev, struct tcg2_event_log *elog,
bool ignore_existing_log)
{
struct tcg2_event_log log;
int rc;
elog->log_position = 0;
elog->found = false;
rc = tcg2_platform_get_log(dev, (void **)&log.log, &log.log_size);
if (!rc) {
log.log_position = 0;
log.found = false;
if (!ignore_existing_log) {
rc = tcg2_log_parse(dev, &log);
if (rc)
return rc;
}
if (elog->log_size) {
if (log.found) {
if (elog->log_size < log.log_position)
return -ENOBUFS;
/*
* Copy the discovered log into the user buffer
* if there's enough space.
*/
memcpy(elog->log, log.log, log.log_position);
}
unmap_physmem(log.log, MAP_NOCACHE);
} else {
elog->log = log.log;
elog->log_size = log.log_size;
}
elog->log_position = log.log_position;
elog->found = log.found;
}
/*
* Initialize the log buffer if no log was discovered and the buffer is
* valid. User's can pass in their own buffer as a fallback if no
* memory region is found.
*/
if (!elog->found && elog->log_size)
rc = tcg2_log_init(dev, elog);
return rc;
}
int tcg2_measurement_init(struct udevice **dev, struct tcg2_event_log *elog,
bool ignore_existing_log)
{
int rc;
rc = tcg2_platform_get_tpm2(dev);
if (rc)
return rc;
rc = tpm_auto_start(*dev);
if (rc)
return rc;
rc = tcg2_log_prepare_buffer(*dev, elog, ignore_existing_log);
if (rc) {
tcg2_measurement_term(*dev, elog, true);
return rc;
}
rc = tcg2_measure_event(*dev, elog, 0, EV_S_CRTM_VERSION,
strlen(version_string) + 1,
(u8 *)version_string);
if (rc) {
tcg2_measurement_term(*dev, elog, true);
return rc;
}
return 0;
}
void tcg2_measurement_term(struct udevice *dev, struct tcg2_event_log *elog,
bool error)
{
u32 event = error ? 0x1 : 0xffffffff;
int i;
for (i = 0; i < 8; ++i)
tcg2_measure_event(dev, elog, i, EV_SEPARATOR, sizeof(event),
(const u8 *)&event);
if (elog->log)
unmap_physmem(elog->log, MAP_NOCACHE);
}
__weak int tcg2_platform_get_log(struct udevice *dev, void **addr, u32 *size)
{
const __be32 *addr_prop;
const __be32 *size_prop;
int asize;
int ssize;
*addr = NULL;
*size = 0;
addr_prop = dev_read_prop(dev, "tpm_event_log_addr", &asize);
if (!addr_prop)
addr_prop = dev_read_prop(dev, "linux,sml-base", &asize);
size_prop = dev_read_prop(dev, "tpm_event_log_size", &ssize);
if (!size_prop)
size_prop = dev_read_prop(dev, "linux,sml-size", &ssize);
if (addr_prop && size_prop) {
u64 a = of_read_number(addr_prop, asize / sizeof(__be32));
u64 s = of_read_number(size_prop, ssize / sizeof(__be32));
*addr = map_physmem(a, s, MAP_NOCACHE);
*size = (u32)s;
} else {
struct ofnode_phandle_args args;
phys_addr_t a;
fdt_size_t s;
if (dev_read_phandle_with_args(dev, "memory-region", NULL, 0,
0, &args))
return -ENODEV;
a = ofnode_get_addr_size(args.node, "reg", &s);
if (a == FDT_ADDR_T_NONE)
return -ENOMEM;
*addr = map_physmem(a, s, MAP_NOCACHE);
*size = (u32)s;
}
return 0;
}
__weak int tcg2_platform_get_tpm2(struct udevice **dev)
{
for_each_tpm_device(*dev) {
if (tpm_get_version(*dev) == TPM_V2)
return 0;
}
return -ENODEV;
}
u32 tcg2_algorithm_to_mask(enum tpm2_algorithms algo)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(hash_algo_list); i++) {
if (hash_algo_list[i].hash_alg == algo)
return hash_algo_list[i].hash_mask;
}
return 0;
}
__weak void tcg2_platform_startup_error(struct udevice *dev, int rc) {}