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tpm: Support boot measurements

Browse source 
Add TPM2 functions to support boot measurement. This includes
starting up the TPM, initializing/appending the event log, and
measuring the U-Boot version. Much of the code was used in the
EFI subsystem, so remove it there and use the common functions.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
For the API moving around from EFI -> u-boot core
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
For EFI testing
Tested-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Eddie James 2023-10-24 10:43:49 -05:00 • committed by Ilias Apalodimas
parent 54b96e8b2b
commit 97707f12fd
5 changed files with 1155 additions and 1021 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

44
include/efi_tcg2.h
View file

@ -129,50 +129,6 @@ struct efi_tcg2_boot_service_capability {
#define BOOT_SERVICE_CAPABILITY_MIN \ #define BOOT_SERVICE_CAPABILITY_MIN \
offsetof(struct efi_tcg2_boot_service_capability, number_of_pcr_banks) offsetof(struct efi_tcg2_boot_service_capability, number_of_pcr_banks)
#define TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03 "Spec ID Event03"
#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 TCG_EfiSpecIdEventAlgorithmSize - hashing algorithm information
*
* @algorithm_id: algorithm defined in enum tpm2_algorithms
* @digest_size: size of the algorithm
*/
struct tcg_efi_spec_id_event_algorithm_size {
u16 algorithm_id;
u16 digest_size;
} __packed;
/**
* struct TCG_EfiSpecIDEventStruct - content of the event log header
*
* @signature: signature, set to Spec ID Event03
* @platform_class: class defined in TCG ACPI Specification
* Client Common Header.
* @spec_version_minor: minor version
* @spec_version_major: major version
* @spec_version_errata: major version
* @uintn_size: size of the efi_uintn_t fields used in various
* data structures used in this specification.
* 0x01 indicates u32 and 0x02 indicates u64
* @number_of_algorithms: hashing algorithms used in this event log
* @digest_sizes: array of number_of_algorithms pairs
* 1st member defines the algorithm id
* 2nd member defines the algorithm size
*/
struct tcg_efi_spec_id_event {
u8 signature[16];
u32 platform_class;
u8 spec_version_minor;
u8 spec_version_major;
u8 spec_errata;
u8 uintn_size;
u32 number_of_algorithms;
struct tcg_efi_spec_id_event_algorithm_size digest_sizes[];
} __packed;
/** /**
* struct tdEFI_TCG2_FINAL_EVENTS_TABLE - log entries after Get Event Log * struct tdEFI_TCG2_FINAL_EVENTS_TABLE - log entries after Get Event Log
* @version: version number for this structure * @version: version number for this structure

259
include/tpm-v2.h
View file

@ -216,6 +216,50 @@ struct tcg_pcr_event2 {
u8 event[]; u8 event[];
} __packed; } __packed;
/**
* struct TCG_EfiSpecIdEventAlgorithmSize - hashing algorithm information
*
* @algorithm_id: algorithm defined in enum tpm2_algorithms
* @digest_size: size of the algorithm
*/
struct tcg_efi_spec_id_event_algorithm_size {
u16 algorithm_id;
u16 digest_size;
} __packed;
#define TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03 "Spec ID Event03"
#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 TCG_EfiSpecIDEventStruct - content of the event log header
*
* @signature: signature, set to Spec ID Event03
* @platform_class: class defined in TCG ACPI Specification
* Client Common Header.
* @spec_version_minor: minor version
* @spec_version_major: major version
* @spec_version_errata: major version
* @uintn_size: size of the efi_uintn_t fields used in various
* data structures used in this specification.
* 0x01 indicates u32 and 0x02 indicates u64
* @number_of_algorithms: hashing algorithms used in this event log
* @digest_sizes: array of number_of_algorithms pairs
* 1st member defines the algorithm id
* 2nd member defines the algorithm size
*/
struct tcg_efi_spec_id_event {
u8 signature[16];
u32 platform_class;
u8 spec_version_minor;
u8 spec_version_major;
u8 spec_errata;
u8 uintn_size;
u32 number_of_algorithms;
struct tcg_efi_spec_id_event_algorithm_size digest_sizes[];
} __packed;
/** /**
* TPM2 Structure Tags for command/response buffers. * TPM2 Structure Tags for command/response buffers.
* *
@ -342,6 +386,26 @@ enum tpm2_algorithms {
TPM2_ALG_SM3_256 = 0x12, TPM2_ALG_SM3_256 = 0x12,
}; };
extern const enum tpm2_algorithms tpm2_supported_algorithms[4];
static inline u16 tpm2_algorithm_to_len(enum tpm2_algorithms a)
{
switch (a) {
case TPM2_ALG_SHA1:
return TPM2_SHA1_DIGEST_SIZE;
case TPM2_ALG_SHA256:
return TPM2_SHA256_DIGEST_SIZE;
case TPM2_ALG_SHA384:
return TPM2_SHA384_DIGEST_SIZE;
case TPM2_ALG_SHA512:
return TPM2_SHA512_DIGEST_SIZE;
default:
return 0;
}
}
#define tpm2_algorithm_to_mask(a) (1 << (a))
/* NV index attributes */ /* NV index attributes */
enum tpm_index_attrs { enum tpm_index_attrs {
TPMA_NV_PPWRITE = 1UL << 0, TPMA_NV_PPWRITE = 1UL << 0,
@ -421,6 +485,188 @@ enum {
HR_NV_INDEX = TPM_HT_NV_INDEX << HR_SHIFT, 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. * Issue a TPM2_Startup command.
* *
@ -540,6 +786,19 @@ u32 tpm2_pcr_read(struct udevice *dev, u32 idx, unsigned int idx_min_sz,
u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property, u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property,
void *buf, size_t prop_count); void *buf, size_t prop_count);
/**
* tpm2_get_pcr_info() - get the supported, active PCRs and number of banks
*
* @dev: TPM device
* @supported_pcr: bitmask with the algorithms supported
* @active_pcr: bitmask with the active algorithms
* @pcr_banks: number of PCR banks
*
* @return 0 on success, code of operation or negative errno on failure
*/
int tpm2_get_pcr_info(struct udevice *dev, u32 *supported_pcr, u32 *active_pcr,
u32 *pcr_banks);
/** /**
* Issue a TPM2_DictionaryAttackLockReset command. * Issue a TPM2_DictionaryAttackLockReset command.
* *

4
lib/Kconfig
View file

@ -431,6 +431,10 @@ config TPM
bool "Trusted Platform Module (TPM) Support" bool "Trusted Platform Module (TPM) Support"
depends on DM depends on DM
imply DM_RNG imply DM_RNG
select SHA1
select SHA256
select SHA384
select SHA512
help help
This enables support for TPMs which can be used to provide security This enables support for TPMs which can be used to provide security
features for your board. The TPM can be connected via LPC or I2C features for your board. The TPM can be connected via LPC or I2C

1013
lib/efi_loader/efi_tcg2.c
View file

File diff suppressed because it is too large Load diff

814
lib/tpm-v2.c
View file

@ -1,16 +1,705 @@
// SPDX-License-Identifier: GPL-2.0+ // SPDX-License-Identifier: GPL-2.0+
/* /*
* Copyright (c) 2023 Linaro Limited
* Copyright (c) 2018 Bootlin * Copyright (c) 2018 Bootlin
* Author: Miquel Raynal <miquel.raynal@bootlin.com> * Author: Miquel Raynal <miquel.raynal@bootlin.com>
*/ */
#include <common.h> #include <common.h>
#include <dm.h> #include <dm.h>
#include <dm/of_access.h>
#include <tpm_api.h>
#include <tpm-common.h> #include <tpm-common.h>
#include <tpm-v2.h> #include <tpm-v2.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/bitops.h>
#include <linux/unaligned/be_byteshift.h>
#include <linux/unaligned/generic.h>
#include <linux/unaligned/le_byteshift.h>
#include "tpm-utils.h" #include "tpm-utils.h"
const enum tpm2_algorithms tpm2_supported_algorithms[4] = {
TPM2_ALG_SHA1,
TPM2_ALG_SHA256,
TPM2_ALG_SHA384,
TPM2_ALG_SHA512,
};
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(tpm2_supported_algorithms); ++i) {
u32 mask =
tpm2_algorithm_to_mask(tpm2_supported_algorithms[i]);
if (!(active & mask))
continue;
switch (tpm2_supported_algorithms[i]) {
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__,
tpm2_supported_algorithms[i]);
continue;
}
digest_list->digests[digest_list->count].hash_alg =
tpm2_supported_algorithms[i];
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;
u32 mask;
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(tpm2_supported_algorithms); ++i) {
mask = tpm2_algorithm_to_mask(tpm2_supported_algorithms[i]);
if (!(active & mask))
continue;
switch (tpm2_supported_algorithms[i]) {
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(tpm2_supported_algorithms); ++i) {
mask = tpm2_algorithm_to_mask(tpm2_supported_algorithms[i]);
if (!(active & mask))
continue;
len = tpm2_algorithm_to_len(tpm2_supported_algorithms[i]);
if (!len)
continue;
put_unaligned_le16(tpm2_supported_algorithms[i],
&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(tpm2_supported_algorithms) ||
(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(tpm2_supported_algorithms))
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 -ENOSPC;
/*
* 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) u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode)
{ {
const u8 command_v2[12] = { const u8 command_v2[12] = {
@ -359,6 +1048,131 @@ u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property,
return 0; return 0;
} }
static int tpm2_get_num_pcr(struct udevice *dev, u32 *num_pcr)
{
u8 response[(sizeof(struct tpms_capability_data) -
offsetof(struct tpms_capability_data, data))];
u32 properties_offset =
offsetof(struct tpml_tagged_tpm_property, tpm_property) +
offsetof(struct tpms_tagged_property, value);
u32 ret;
memset(response, 0, sizeof(response));
ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
TPM2_PT_PCR_COUNT, response, 1);
if (ret)
return ret;
*num_pcr = get_unaligned_be32(response + properties_offset);
if (*num_pcr > TPM2_MAX_PCRS) {
printf("%s: too many pcrs: %u\n", __func__, *num_pcr);
return -E2BIG;
}
return 0;
}
static bool tpm2_is_active_pcr(struct tpms_pcr_selection *selection)
{
int i;
/*
* check the pcr_select. If at least one of the PCRs supports the
* algorithm add it on the active ones
*/
for (i = 0; i < selection->size_of_select; i++) {
if (selection->pcr_select[i])
return true;
}
return false;
}
int tpm2_get_pcr_info(struct udevice *dev, u32 *supported_pcr, u32 *active_pcr,
u32 *pcr_banks)
{
u8 response[(sizeof(struct tpms_capability_data) -
offsetof(struct tpms_capability_data, data))];
struct tpml_pcr_selection pcrs;
u32 num_pcr;
size_t i;
u32 ret;
*supported_pcr = 0;
*active_pcr = 0;
*pcr_banks = 0;
memset(response, 0, sizeof(response));
ret = tpm2_get_capability(dev, TPM2_CAP_PCRS, 0, response, 1);
if (ret)
return ret;
pcrs.count = get_unaligned_be32(response);
/*
* We only support 5 algorithms for now so check against that
* instead of TPM2_NUM_PCR_BANKS
*/
if (pcrs.count > ARRAY_SIZE(tpm2_supported_algorithms) ||
pcrs.count < 1) {
printf("%s: too many pcrs: %u\n", __func__, pcrs.count);
return -EMSGSIZE;
}
ret = tpm2_get_num_pcr(dev, &num_pcr);
if (ret)
return ret;
for (i = 0; i < pcrs.count; i++) {
/*
* Definition of TPMS_PCR_SELECTION Structure
* hash: u16
* size_of_select: u8
* pcr_select: u8 array
*
* The offsets depend on the number of the device PCRs
* so we have to calculate them based on that
*/
u32 hash_offset = offsetof(struct tpml_pcr_selection, selection) +
i * offsetof(struct tpms_pcr_selection, pcr_select) +
i * ((num_pcr + 7) / 8);
u32 size_select_offset =
hash_offset + offsetof(struct tpms_pcr_selection,
size_of_select);
u32 pcr_select_offset =
hash_offset + offsetof(struct tpms_pcr_selection,
pcr_select);
pcrs.selection[i].hash =
get_unaligned_be16(response + hash_offset);
pcrs.selection[i].size_of_select =
__get_unaligned_be(response + size_select_offset);
if (pcrs.selection[i].size_of_select > TPM2_PCR_SELECT_MAX) {
printf("%s: pcrs selection too large: %u\n", __func__,
pcrs.selection[i].size_of_select);
return -ENOBUFS;
}
/* copy the array of pcr_select */
memcpy(pcrs.selection[i].pcr_select, response + pcr_select_offset,
pcrs.selection[i].size_of_select);
}
for (i = 0; i < pcrs.count; i++) {
u32 hash_mask = tpm2_algorithm_to_mask(pcrs.selection[i].hash);
if (hash_mask) {
*supported_pcr |= hash_mask;
if (tpm2_is_active_pcr(&pcrs.selection[i]))
*active_pcr |= hash_mask;
} else {
printf("%s: unknown algorithm %x\n", __func__,
pcrs.selection[i].hash);
}
}
*pcr_banks = pcrs.count;
return 0;
}
u32 tpm2_dam_reset(struct udevice *dev, const char *pw, const ssize_t pw_sz) u32 tpm2_dam_reset(struct udevice *dev, const char *pw, const ssize_t pw_sz)
{ {
u8 command_v2[COMMAND_BUFFER_SIZE] = { u8 command_v2[COMMAND_BUFFER_SIZE] = {