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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Defines APIs that allow an OS to interact with UEFI firmware to query
- * information about the device.
- * https://trustedcomputinggroup.org/resource/tcg-efi-protocol-specification/
- *
- * Copyright (c) 2020, Linaro Limited
- */
- #define LOG_CATEGORY LOGC_EFI
- #include <common.h>
- #include <dm.h>
- #include <efi_loader.h>
- #include <efi_tcg2.h>
- #include <log.h>
- #include <malloc.h>
- #include <version.h>
- #include <tpm-v2.h>
- #include <u-boot/hash-checksum.h>
- #include <u-boot/sha1.h>
- #include <u-boot/sha256.h>
- #include <u-boot/sha512.h>
- #include <linux/unaligned/access_ok.h>
- #include <linux/unaligned/generic.h>
- #include <hexdump.h>
- struct event_log_buffer {
- void *buffer;
- void *final_buffer;
- size_t pos; /* eventlog position */
- size_t final_pos; /* final events config table position */
- size_t last_event_size;
- bool get_event_called;
- bool truncated;
- };
- static struct event_log_buffer event_log;
- static bool tcg2_efi_app_invoked;
- /*
- * When requesting TPM2_CAP_TPM_PROPERTIES the value is on a standard offset.
- * Since the current tpm2_get_capability() response buffers starts at
- * 'union tpmu_capabilities data' of 'struct tpms_capability_data', calculate
- * the response size and offset once for all consumers
- */
- #define TPM2_RESPONSE_BUFFER_SIZE (sizeof(struct tpms_capability_data) - \
- offsetof(struct tpms_capability_data, data))
- #define properties_offset (offsetof(struct tpml_tagged_tpm_property, tpm_property) + \
- offsetof(struct tpms_tagged_property, value))
- static const efi_guid_t efi_guid_tcg2_protocol = EFI_TCG2_PROTOCOL_GUID;
- static const efi_guid_t efi_guid_final_events = EFI_TCG2_FINAL_EVENTS_TABLE_GUID;
- struct digest_info {
- u16 hash_alg;
- u32 hash_mask;
- u16 hash_len;
- };
- static const struct digest_info hash_algo_list[] = {
- {
- TPM2_ALG_SHA1,
- EFI_TCG2_BOOT_HASH_ALG_SHA1,
- TPM2_SHA1_DIGEST_SIZE,
- },
- {
- TPM2_ALG_SHA256,
- EFI_TCG2_BOOT_HASH_ALG_SHA256,
- TPM2_SHA256_DIGEST_SIZE,
- },
- {
- TPM2_ALG_SHA384,
- EFI_TCG2_BOOT_HASH_ALG_SHA384,
- TPM2_SHA384_DIGEST_SIZE,
- },
- {
- TPM2_ALG_SHA512,
- EFI_TCG2_BOOT_HASH_ALG_SHA512,
- TPM2_SHA512_DIGEST_SIZE,
- },
- };
- struct variable_info {
- u16 *name;
- const efi_guid_t *guid;
- };
- static struct variable_info secure_variables[] = {
- {L"SecureBoot", &efi_global_variable_guid},
- {L"PK", &efi_global_variable_guid},
- {L"KEK", &efi_global_variable_guid},
- {L"db", &efi_guid_image_security_database},
- {L"dbx", &efi_guid_image_security_database},
- };
- #define MAX_HASH_COUNT ARRAY_SIZE(hash_algo_list)
- /**
- * alg_to_mask - Get a TCG hash mask for algorithms
- *
- * @hash_alg: TCG defined algorithm
- *
- * @Return: TCG hashing algorithm bitmaps, 0 if the algorithm is not supported
- */
- static u32 alg_to_mask(u16 hash_alg)
- {
- size_t i;
- for (i = 0; i < MAX_HASH_COUNT; i++) {
- if (hash_algo_list[i].hash_alg == hash_alg)
- return hash_algo_list[i].hash_mask;
- }
- return 0;
- }
- /**
- * alg_to_len - Get a TCG hash len for algorithms
- *
- * @hash_alg: TCG defined algorithm
- *
- * @Return: len of chosen algorithm, 0 if the algorithm is not supported
- */
- static u16 alg_to_len(u16 hash_alg)
- {
- size_t i;
- for (i = 0; i < MAX_HASH_COUNT; i++) {
- if (hash_algo_list[i].hash_alg == hash_alg)
- return hash_algo_list[i].hash_len;
- }
- return 0;
- }
- static u32 tcg_event_final_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 hash_alg = digest_list->digests[i].hash_alg;
- len += offsetof(struct tpmt_ha, digest);
- len += alg_to_len(hash_alg);
- }
- len += sizeof(u32); /* tcg_pcr_event2 event_size*/
- return len;
- }
- /* tcg2_pcr_extend - Extend PCRs for a TPM2 device for a given tpml_digest_values
- *
- * @dev: device
- * @digest_list: list of digest algorithms to extend
- *
- * @Return: status code
- */
- static efi_status_t tcg2_pcr_extend(struct udevice *dev, u32 pcr_index,
- struct tpml_digest_values *digest_list)
- {
- u32 rc;
- size_t 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,
- alg_to_len(alg));
- if (rc) {
- EFI_PRINT("Failed to extend PCR\n");
- return EFI_DEVICE_ERROR;
- }
- }
- return EFI_SUCCESS;
- }
- /* tcg2_agile_log_append - Append an agile event to out eventlog
- *
- * @pcr_index: PCR index
- * @event_type: type of event added
- * @digest_list: list of digest algorithms to add
- * @size: size of event
- * @event: event to add
- *
- * @Return: status code
- */
- static efi_status_t tcg2_agile_log_append(u32 pcr_index, u32 event_type,
- struct tpml_digest_values *digest_list,
- u32 size, u8 event[])
- {
- void *log = (void *)((uintptr_t)event_log.buffer + event_log.pos);
- size_t pos;
- size_t i;
- u32 event_size;
- if (event_log.get_event_called)
- log = (void *)((uintptr_t)event_log.final_buffer +
- event_log.final_pos);
- /*
- * size refers to the length of event[] only, we need to check against
- * the final tcg_pcr_event2 size
- */
- event_size = size + tcg_event_final_size(digest_list);
- if (event_log.pos + event_size > TPM2_EVENT_LOG_SIZE ||
- event_log.final_pos + event_size > TPM2_EVENT_LOG_SIZE) {
- event_log.truncated = true;
- return EFI_VOLUME_FULL;
- }
- put_unaligned_le32(pcr_index, log);
- pos = offsetof(struct tcg_pcr_event2, event_type);
- put_unaligned_le32(event_type, (void *)((uintptr_t)log + pos));
- pos = offsetof(struct tcg_pcr_event2, digests); /* count */
- put_unaligned_le32(digest_list->count, (void *)((uintptr_t)log + pos));
- pos += offsetof(struct tpml_digest_values, digests);
- for (i = 0; i < digest_list->count; i++) {
- u16 hash_alg = digest_list->digests[i].hash_alg;
- u8 *digest = (u8 *)&digest_list->digests[i].digest;
- put_unaligned_le16(hash_alg, (void *)((uintptr_t)log + pos));
- pos += offsetof(struct tpmt_ha, digest);
- memcpy((void *)((uintptr_t)log + pos), digest, alg_to_len(hash_alg));
- pos += alg_to_len(hash_alg);
- }
- put_unaligned_le32(size, (void *)((uintptr_t)log + pos));
- pos += sizeof(u32); /* tcg_pcr_event2 event_size*/
- memcpy((void *)((uintptr_t)log + pos), event, size);
- pos += size;
- /* make sure the calculated buffer is what we checked against */
- if (pos != event_size)
- return EFI_INVALID_PARAMETER;
- /* if GetEventLog hasn't been called update the normal log */
- if (!event_log.get_event_called) {
- event_log.pos += pos;
- event_log.last_event_size = pos;
- } else {
- /* if GetEventLog has been called update config table log */
- struct efi_tcg2_final_events_table *final_event;
- final_event =
- (struct efi_tcg2_final_events_table *)(event_log.final_buffer);
- final_event->number_of_events++;
- event_log.final_pos += pos;
- }
- return EFI_SUCCESS;
- }
- /**
- * platform_get_tpm_device() - retrieve TPM device
- *
- * This function retrieves the udevice implementing a TPM
- *
- * This function may be overridden if special initialization is needed.
- *
- * @dev: udevice
- * Return: status code
- */
- __weak efi_status_t platform_get_tpm2_device(struct udevice **dev)
- {
- for_each_tpm_device(*dev) {
- /* Only support TPMv2 devices */
- if (tpm_get_version(*dev) == TPM_V2)
- return EFI_SUCCESS;
- }
- return EFI_NOT_FOUND;
- }
- /**
- * tpm2_get_max_command_size() - get the supported max command size
- *
- * @dev: TPM device
- * @max_command_size: output buffer for the size
- *
- * Return: 0 on success, -1 on error
- */
- static int tpm2_get_max_command_size(struct udevice *dev, u16 *max_command_size)
- {
- u8 response[TPM2_RESPONSE_BUFFER_SIZE];
- u32 ret;
- memset(response, 0, sizeof(response));
- ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
- TPM2_PT_MAX_COMMAND_SIZE, response, 1);
- if (ret)
- return -1;
- *max_command_size = (uint16_t)get_unaligned_be32(response +
- properties_offset);
- return 0;
- }
- /**
- * tpm2_get_max_response_size() - get the supported max response size
- *
- * @dev: TPM device
- * @max_response_size: output buffer for the size
- *
- * Return: 0 on success, -1 on error
- */
- static int tpm2_get_max_response_size(struct udevice *dev,
- u16 *max_response_size)
- {
- u8 response[TPM2_RESPONSE_BUFFER_SIZE];
- u32 ret;
- memset(response, 0, sizeof(response));
- ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
- TPM2_PT_MAX_RESPONSE_SIZE, response, 1);
- if (ret)
- return -1;
- *max_response_size = (uint16_t)get_unaligned_be32(response +
- properties_offset);
- return 0;
- }
- /**
- * tpm2_get_manufacturer_id() - get the manufacturer ID
- *
- * @dev: TPM device
- * @manufacturer_id: output buffer for the id
- *
- * Return: 0 on success, -1 on error
- */
- static int tpm2_get_manufacturer_id(struct udevice *dev, u32 *manufacturer_id)
- {
- u8 response[TPM2_RESPONSE_BUFFER_SIZE];
- u32 ret;
- memset(response, 0, sizeof(response));
- ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
- TPM2_PT_MANUFACTURER, response, 1);
- if (ret)
- return -1;
- *manufacturer_id = get_unaligned_be32(response + properties_offset);
- return 0;
- }
- /**
- * tpm2_get_num_pcr() - get the number of PCRs
- *
- * @dev: TPM device
- * @manufacturer_id: output buffer for the number
- *
- * Return: 0 on success, -1 on error
- */
- static int tpm2_get_num_pcr(struct udevice *dev, u32 *num_pcr)
- {
- u8 response[TPM2_RESPONSE_BUFFER_SIZE];
- 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 -1;
- *num_pcr = get_unaligned_be32(response + properties_offset);
- if (*num_pcr > TPM2_MAX_PCRS)
- return -1;
- return 0;
- }
- /**
- * is_active_pcr() - Check if a supported algorithm is active
- *
- * @dev: TPM device
- * @selection: struct of PCR information
- *
- * Return: true if PCR is active
- */
- static bool 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;
- }
- /**
- * 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, -1 on error
- */
- static int tpm2_get_pcr_info(struct udevice *dev, u32 *supported_pcr,
- u32 *active_pcr, u32 *pcr_banks)
- {
- u8 response[TPM2_RESPONSE_BUFFER_SIZE];
- struct tpml_pcr_selection pcrs;
- u32 ret, num_pcr;
- size_t i;
- int tpm_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)
- goto out;
- 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 > MAX_HASH_COUNT || pcrs.count < 1)
- goto out;
- tpm_ret = tpm2_get_num_pcr(dev, &num_pcr);
- if (tpm_ret)
- goto out;
- 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)
- goto out;
- /* 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 = alg_to_mask(pcrs.selection[i].hash);
- if (hash_mask) {
- *supported_pcr |= hash_mask;
- if (is_active_pcr(&pcrs.selection[i]))
- *active_pcr |= hash_mask;
- } else {
- EFI_PRINT("Unknown algorithm %x\n", pcrs.selection[i].hash);
- }
- }
- *pcr_banks = pcrs.count;
- return 0;
- out:
- return -1;
- }
- /**
- * __get_active_pcr_banks() - returns the currently active PCR banks
- *
- * @active_pcr_banks: pointer for receiving the bitmap of currently
- * active PCR banks
- *
- * Return: status code
- */
- static efi_status_t __get_active_pcr_banks(u32 *active_pcr_banks)
- {
- struct udevice *dev;
- u32 active = 0, supported = 0, pcr_banks = 0;
- efi_status_t ret;
- int err;
- ret = platform_get_tpm2_device(&dev);
- if (ret != EFI_SUCCESS)
- goto out;
- err = tpm2_get_pcr_info(dev, &supported, &active, &pcr_banks);
- if (err) {
- ret = EFI_DEVICE_ERROR;
- goto out;
- }
- *active_pcr_banks = active;
- out:
- return ret;
- }
- /* tcg2_create_digest - create a list of digests of the supported PCR banks
- * for a given memory range
- *
- * @input: input memory
- * @length: length of buffer to calculate the digest
- * @digest_list: list of digests to fill in
- *
- * Return: status code
- */
- static efi_status_t tcg2_create_digest(const u8 *input, u32 length,
- struct tpml_digest_values *digest_list)
- {
- sha1_context ctx;
- sha256_context ctx_256;
- sha512_context ctx_512;
- u8 final[TPM2_SHA512_DIGEST_SIZE];
- efi_status_t ret;
- u32 active;
- size_t i;
- ret = __get_active_pcr_banks(&active);
- if (ret != EFI_SUCCESS)
- return ret;
- digest_list->count = 0;
- for (i = 0; i < MAX_HASH_COUNT; i++) {
- u16 hash_alg = hash_algo_list[i].hash_alg;
- if (!(active & alg_to_mask(hash_alg)))
- continue;
- switch (hash_alg) {
- case TPM2_ALG_SHA1:
- sha1_starts(&ctx);
- sha1_update(&ctx, input, length);
- sha1_finish(&ctx, final);
- break;
- case TPM2_ALG_SHA256:
- sha256_starts(&ctx_256);
- sha256_update(&ctx_256, input, length);
- sha256_finish(&ctx_256, final);
- break;
- case TPM2_ALG_SHA384:
- sha384_starts(&ctx_512);
- sha384_update(&ctx_512, input, length);
- sha384_finish(&ctx_512, final);
- break;
- case TPM2_ALG_SHA512:
- sha512_starts(&ctx_512);
- sha512_update(&ctx_512, input, length);
- sha512_finish(&ctx_512, final);
- break;
- default:
- EFI_PRINT("Unsupported algorithm %x\n", hash_alg);
- return EFI_INVALID_PARAMETER;
- }
- digest_list->digests[digest_list->count].hash_alg = hash_alg;
- memcpy(&digest_list->digests[digest_list->count].digest, final,
- (u32)alg_to_len(hash_alg));
- digest_list->count++;
- }
- return EFI_SUCCESS;
- }
- /**
- * efi_tcg2_get_capability() - protocol capability information and state information
- *
- * @this: TCG2 protocol instance
- * @capability: caller allocated memory with size field to the size of
- * the structure allocated
- * Return: status code
- */
- static efi_status_t EFIAPI
- efi_tcg2_get_capability(struct efi_tcg2_protocol *this,
- struct efi_tcg2_boot_service_capability *capability)
- {
- struct udevice *dev;
- efi_status_t efi_ret;
- int ret;
- EFI_ENTRY("%p, %p", this, capability);
- if (!this || !capability) {
- efi_ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- if (capability->size < BOOT_SERVICE_CAPABILITY_MIN) {
- capability->size = BOOT_SERVICE_CAPABILITY_MIN;
- efi_ret = EFI_BUFFER_TOO_SMALL;
- goto out;
- }
- if (capability->size < sizeof(*capability)) {
- capability->size = sizeof(*capability);
- efi_ret = EFI_BUFFER_TOO_SMALL;
- goto out;
- }
- capability->structure_version.major = 1;
- capability->structure_version.minor = 1;
- capability->protocol_version.major = 1;
- capability->protocol_version.minor = 1;
- efi_ret = platform_get_tpm2_device(&dev);
- if (efi_ret != EFI_SUCCESS) {
- capability->supported_event_logs = 0;
- capability->hash_algorithm_bitmap = 0;
- capability->tpm_present_flag = false;
- capability->max_command_size = 0;
- capability->max_response_size = 0;
- capability->manufacturer_id = 0;
- capability->number_of_pcr_banks = 0;
- capability->active_pcr_banks = 0;
- efi_ret = EFI_SUCCESS;
- goto out;
- }
- /* We only allow a TPMv2 device to register the EFI protocol */
- capability->supported_event_logs = TCG2_EVENT_LOG_FORMAT_TCG_2;
- capability->tpm_present_flag = true;
- /* Supported and active PCRs */
- capability->hash_algorithm_bitmap = 0;
- capability->active_pcr_banks = 0;
- ret = tpm2_get_pcr_info(dev, &capability->hash_algorithm_bitmap,
- &capability->active_pcr_banks,
- &capability->number_of_pcr_banks);
- if (ret) {
- efi_ret = EFI_DEVICE_ERROR;
- goto out;
- }
- /* Max command size */
- ret = tpm2_get_max_command_size(dev, &capability->max_command_size);
- if (ret) {
- efi_ret = EFI_DEVICE_ERROR;
- goto out;
- }
- /* Max response size */
- ret = tpm2_get_max_response_size(dev, &capability->max_response_size);
- if (ret) {
- efi_ret = EFI_DEVICE_ERROR;
- goto out;
- }
- /* Manufacturer ID */
- ret = tpm2_get_manufacturer_id(dev, &capability->manufacturer_id);
- if (ret) {
- efi_ret = EFI_DEVICE_ERROR;
- goto out;
- }
- return EFI_EXIT(EFI_SUCCESS);
- out:
- return EFI_EXIT(efi_ret);
- }
- /**
- * efi_tcg2_get_eventlog() - retrieve the the address of an event log and its
- * last entry
- *
- * @this: TCG2 protocol instance
- * @log_format: type of event log format
- * @event_log_location: pointer to the memory address of the event log
- * @event_log_last_entry: pointer to the address of the start of the last
- * entry in the event log in memory, if log contains
- * more than 1 entry
- * @event_log_truncated: set to true, if the Event Log is missing at i
- * least one entry
- *
- * Return: status code
- */
- static efi_status_t EFIAPI
- efi_tcg2_get_eventlog(struct efi_tcg2_protocol *this,
- efi_tcg_event_log_format log_format,
- u64 *event_log_location, u64 *event_log_last_entry,
- bool *event_log_truncated)
- {
- efi_status_t ret = EFI_SUCCESS;
- struct udevice *dev;
- EFI_ENTRY("%p, %u, %p, %p, %p", this, log_format, event_log_location,
- event_log_last_entry, event_log_truncated);
- if (!this || !event_log_location || !event_log_last_entry ||
- !event_log_truncated) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- /* Only support TPMV2 */
- if (log_format != TCG2_EVENT_LOG_FORMAT_TCG_2) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- ret = platform_get_tpm2_device(&dev);
- if (ret != EFI_SUCCESS) {
- event_log_location = NULL;
- event_log_last_entry = NULL;
- *event_log_truncated = false;
- ret = EFI_SUCCESS;
- goto out;
- }
- *event_log_location = (uintptr_t)event_log.buffer;
- *event_log_last_entry = (uintptr_t)(event_log.buffer + event_log.pos -
- event_log.last_event_size);
- *event_log_truncated = event_log.truncated;
- event_log.get_event_called = true;
- out:
- return EFI_EXIT(ret);
- }
- /**
- * tcg2_hash_pe_image() - calculate PE/COFF image hash
- *
- * @efi: pointer to the EFI binary
- * @efi_size: size of @efi binary
- * @digest_list: list of digest algorithms to extend
- *
- * Return: status code
- */
- static efi_status_t tcg2_hash_pe_image(void *efi, u64 efi_size,
- struct tpml_digest_values *digest_list)
- {
- WIN_CERTIFICATE *wincerts = NULL;
- size_t wincerts_len;
- struct efi_image_regions *regs = NULL;
- void *new_efi = NULL;
- u8 hash[TPM2_SHA512_DIGEST_SIZE];
- efi_status_t ret;
- u32 active;
- int i;
- new_efi = efi_prepare_aligned_image(efi, &efi_size);
- if (!new_efi)
- return EFI_OUT_OF_RESOURCES;
- if (!efi_image_parse(new_efi, efi_size, ®s, &wincerts,
- &wincerts_len)) {
- log_err("Parsing PE executable image failed\n");
- ret = EFI_UNSUPPORTED;
- goto out;
- }
- ret = __get_active_pcr_banks(&active);
- if (ret != EFI_SUCCESS) {
- goto out;
- }
- digest_list->count = 0;
- for (i = 0; i < MAX_HASH_COUNT; i++) {
- u16 hash_alg = hash_algo_list[i].hash_alg;
- if (!(active & alg_to_mask(hash_alg)))
- continue;
- switch (hash_alg) {
- case TPM2_ALG_SHA1:
- hash_calculate("sha1", regs->reg, regs->num, hash);
- break;
- case TPM2_ALG_SHA256:
- hash_calculate("sha256", regs->reg, regs->num, hash);
- break;
- case TPM2_ALG_SHA384:
- hash_calculate("sha384", regs->reg, regs->num, hash);
- break;
- case TPM2_ALG_SHA512:
- hash_calculate("sha512", regs->reg, regs->num, hash);
- break;
- default:
- EFI_PRINT("Unsupported algorithm %x\n", hash_alg);
- return EFI_INVALID_PARAMETER;
- }
- digest_list->digests[digest_list->count].hash_alg = hash_alg;
- memcpy(&digest_list->digests[digest_list->count].digest, hash,
- (u32)alg_to_len(hash_alg));
- digest_list->count++;
- }
- out:
- if (new_efi != efi)
- free(new_efi);
- free(regs);
- return ret;
- }
- /**
- * tcg2_measure_pe_image() - measure PE/COFF image
- *
- * @efi: pointer to the EFI binary
- * @efi_size: size of @efi binary
- * @handle: loaded image handle
- * @loaded_image: loaded image protocol
- *
- * Return: status code
- */
- efi_status_t tcg2_measure_pe_image(void *efi, u64 efi_size,
- struct efi_loaded_image_obj *handle,
- struct efi_loaded_image *loaded_image)
- {
- struct tpml_digest_values digest_list;
- efi_status_t ret;
- struct udevice *dev;
- u32 pcr_index, event_type, event_size;
- struct uefi_image_load_event *image_load_event;
- struct efi_device_path *device_path;
- u32 device_path_length;
- IMAGE_DOS_HEADER *dos;
- IMAGE_NT_HEADERS32 *nt;
- struct efi_handler *handler;
- ret = platform_get_tpm2_device(&dev);
- if (ret != EFI_SUCCESS)
- return ret;
- switch (handle->image_type) {
- case IMAGE_SUBSYSTEM_EFI_APPLICATION:
- pcr_index = 4;
- event_type = EV_EFI_BOOT_SERVICES_APPLICATION;
- break;
- case IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER:
- pcr_index = 2;
- event_type = EV_EFI_BOOT_SERVICES_DRIVER;
- break;
- case IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER:
- pcr_index = 2;
- event_type = EV_EFI_RUNTIME_SERVICES_DRIVER;
- break;
- default:
- return EFI_UNSUPPORTED;
- }
- ret = tcg2_hash_pe_image(efi, efi_size, &digest_list);
- if (ret != EFI_SUCCESS)
- return ret;
- ret = tcg2_pcr_extend(dev, pcr_index, &digest_list);
- if (ret != EFI_SUCCESS)
- return ret;
- ret = efi_search_protocol(&handle->header,
- &efi_guid_loaded_image_device_path, &handler);
- if (ret != EFI_SUCCESS)
- return ret;
- device_path = handler->protocol_interface;
- device_path_length = efi_dp_size(device_path);
- if (device_path_length > 0) {
- /* add end node size */
- device_path_length += sizeof(struct efi_device_path);
- }
- event_size = sizeof(struct uefi_image_load_event) + device_path_length;
- image_load_event = calloc(1, event_size);
- if (!image_load_event)
- return EFI_OUT_OF_RESOURCES;
- image_load_event->image_location_in_memory = (uintptr_t)efi;
- image_load_event->image_length_in_memory = efi_size;
- image_load_event->length_of_device_path = device_path_length;
- dos = (IMAGE_DOS_HEADER *)efi;
- nt = (IMAGE_NT_HEADERS32 *)(efi + dos->e_lfanew);
- if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
- IMAGE_NT_HEADERS64 *nt64 = (IMAGE_NT_HEADERS64 *)nt;
- image_load_event->image_link_time_address =
- nt64->OptionalHeader.ImageBase;
- } else if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
- image_load_event->image_link_time_address =
- nt->OptionalHeader.ImageBase;
- } else {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- /* device_path_length might be zero */
- memcpy(image_load_event->device_path, device_path, device_path_length);
- ret = tcg2_agile_log_append(pcr_index, event_type, &digest_list,
- event_size, (u8 *)image_load_event);
- out:
- free(image_load_event);
- return ret;
- }
- /**
- * efi_tcg2_hash_log_extend_event() - extend and optionally log events
- *
- * @this: TCG2 protocol instance
- * @flags: bitmap providing additional information on the
- * operation
- * @data_to_hash: physical address of the start of the data buffer
- * to be hashed
- * @data_to_hash_len: the length in bytes of the buffer referenced by
- * data_to_hash
- * @efi_tcg_event: pointer to data buffer containing information
- * about the event
- *
- * Return: status code
- */
- static efi_status_t EFIAPI
- efi_tcg2_hash_log_extend_event(struct efi_tcg2_protocol *this, u64 flags,
- u64 data_to_hash, u64 data_to_hash_len,
- struct efi_tcg2_event *efi_tcg_event)
- {
- struct udevice *dev;
- efi_status_t ret;
- u32 event_type, pcr_index, event_size;
- struct tpml_digest_values digest_list;
- EFI_ENTRY("%p, %llu, %llu, %llu, %p", this, flags, data_to_hash,
- data_to_hash_len, efi_tcg_event);
- if (!this || !data_to_hash || !efi_tcg_event) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- ret = platform_get_tpm2_device(&dev);
- if (ret != EFI_SUCCESS)
- goto out;
- if (efi_tcg_event->size < efi_tcg_event->header.header_size +
- sizeof(u32)) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- if (efi_tcg_event->header.pcr_index > EFI_TCG2_MAX_PCR_INDEX) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- /*
- * if PE_COFF_IMAGE is set we need to make sure the image is not
- * corrupted, verify it and hash the PE/COFF image in accordance with
- * the procedure specified in "Calculating the PE Image Hash"
- * section of the "Windows Authenticode Portable Executable Signature
- * Format"
- */
- if (flags & PE_COFF_IMAGE) {
- IMAGE_NT_HEADERS32 *nt;
- ret = efi_check_pe((void *)(uintptr_t)data_to_hash,
- data_to_hash_len, (void **)&nt);
- if (ret != EFI_SUCCESS) {
- log_err("Not a valid PE-COFF file\n");
- ret = EFI_UNSUPPORTED;
- goto out;
- }
- ret = tcg2_hash_pe_image((void *)(uintptr_t)data_to_hash,
- data_to_hash_len, &digest_list);
- } else {
- ret = tcg2_create_digest((u8 *)(uintptr_t)data_to_hash,
- data_to_hash_len, &digest_list);
- }
- if (ret != EFI_SUCCESS)
- goto out;
- pcr_index = efi_tcg_event->header.pcr_index;
- event_type = efi_tcg_event->header.event_type;
- ret = tcg2_pcr_extend(dev, pcr_index, &digest_list);
- if (ret != EFI_SUCCESS)
- goto out;
- if (flags & EFI_TCG2_EXTEND_ONLY) {
- if (event_log.truncated)
- ret = EFI_VOLUME_FULL;
- goto out;
- }
- /*
- * The efi_tcg_event size includes the size component and the
- * headersize
- */
- event_size = efi_tcg_event->size - sizeof(efi_tcg_event->size) -
- efi_tcg_event->header.header_size;
- ret = tcg2_agile_log_append(pcr_index, event_type, &digest_list,
- event_size, efi_tcg_event->event);
- out:
- return EFI_EXIT(ret);
- }
- /**
- * efi_tcg2_submit_command() - Send command to the TPM
- *
- * @this: TCG2 protocol instance
- * @input_param_block_size: size of the TPM input parameter block
- * @input_param_block: pointer to the TPM input parameter block
- * @output_param_block_size: size of the TPM output parameter block
- * @output_param_block: pointer to the TPM output parameter block
- *
- * Return: status code
- */
- static efi_status_t EFIAPI
- efi_tcg2_submit_command(__maybe_unused struct efi_tcg2_protocol *this,
- u32 __maybe_unused input_param_block_size,
- u8 __maybe_unused *input_param_block,
- u32 __maybe_unused output_param_block_size,
- u8 __maybe_unused *output_param_block)
- {
- return EFI_UNSUPPORTED;
- }
- /**
- * efi_tcg2_get_active_pcr_banks() - returns the currently active PCR banks
- *
- * @this: TCG2 protocol instance
- * @active_pcr_banks: pointer for receiving the bitmap of currently
- * active PCR banks
- *
- * Return: status code
- */
- static efi_status_t EFIAPI
- efi_tcg2_get_active_pcr_banks(struct efi_tcg2_protocol *this,
- u32 *active_pcr_banks)
- {
- efi_status_t ret;
- if (!this || !active_pcr_banks) {
- ret = EFI_INVALID_PARAMETER;
- goto out;
- }
- EFI_ENTRY("%p, %p", this, active_pcr_banks);
- ret = __get_active_pcr_banks(active_pcr_banks);
- out:
- return EFI_EXIT(ret);
- }
- /**
- * efi_tcg2_set_active_pcr_banks() - sets the currently active PCR banks
- *
- * @this: TCG2 protocol instance
- * @active_pcr_banks: bitmap of the requested active PCR banks
- *
- * Return: status code
- */
- static efi_status_t EFIAPI
- efi_tcg2_set_active_pcr_banks(__maybe_unused struct efi_tcg2_protocol *this,
- u32 __maybe_unused active_pcr_banks)
- {
- return EFI_UNSUPPORTED;
- }
- /**
- * efi_tcg2_get_result_of_set_active_pcr_banks() - retrieve result for previous
- * set_active_pcr_banks()
- *
- * @this: TCG2 protocol instance
- * @operation_present: non-zero value to indicate a
- * set_active_pcr_banks operation was
- * invoked during last boot
- * @response: result value could be returned
- *
- * Return: status code
- */
- static efi_status_t EFIAPI
- efi_tcg2_get_result_of_set_active_pcr_banks(__maybe_unused struct efi_tcg2_protocol *this,
- u32 __maybe_unused *operation_present,
- u32 __maybe_unused *response)
- {
- return EFI_UNSUPPORTED;
- }
- static const struct efi_tcg2_protocol efi_tcg2_protocol = {
- .get_capability = efi_tcg2_get_capability,
- .get_eventlog = efi_tcg2_get_eventlog,
- .hash_log_extend_event = efi_tcg2_hash_log_extend_event,
- .submit_command = efi_tcg2_submit_command,
- .get_active_pcr_banks = efi_tcg2_get_active_pcr_banks,
- .set_active_pcr_banks = efi_tcg2_set_active_pcr_banks,
- .get_result_of_set_active_pcr_banks = efi_tcg2_get_result_of_set_active_pcr_banks,
- };
- /**
- * create_specid_event() - Create the first event in the eventlog
- *
- * @dev: tpm device
- * @event_header: Pointer to the final event header
- * @event_size: final spec event size
- *
- * Return: status code
- */
- static efi_status_t create_specid_event(struct udevice *dev, void *buffer,
- size_t *event_size)
- {
- struct tcg_efi_spec_id_event *spec_event;
- size_t spec_event_size;
- efi_status_t ret = EFI_DEVICE_ERROR;
- u32 active = 0, supported = 0, pcr_count = 0, alg_count = 0;
- int err;
- size_t i;
- /*
- * Create Spec event. This needs to be the first event in the log
- * according to the TCG EFI protocol spec
- */
- /* Setup specID event data */
- spec_event = (struct tcg_efi_spec_id_event *)buffer;
- memcpy(spec_event->signature, TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03,
- sizeof(spec_event->signature));
- put_unaligned_le32(0, &spec_event->platform_class); /* type client */
- spec_event->spec_version_minor =
- TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2;
- spec_event->spec_version_major =
- TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2;
- spec_event->spec_errata =
- TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_ERRATA_TPM2;
- spec_event->uintn_size = sizeof(efi_uintn_t) / sizeof(u32);
- err = tpm2_get_pcr_info(dev, &supported, &active, &pcr_count);
- if (err)
- goto out;
- for (i = 0; i < pcr_count; i++) {
- u16 hash_alg = hash_algo_list[i].hash_alg;
- u16 hash_len = hash_algo_list[i].hash_len;
- if (active & alg_to_mask(hash_alg)) {
- put_unaligned_le16(hash_alg,
- &spec_event->digest_sizes[alg_count].algorithm_id);
- put_unaligned_le16(hash_len,
- &spec_event->digest_sizes[alg_count].digest_size);
- alg_count++;
- }
- }
- spec_event->number_of_algorithms = alg_count;
- if (spec_event->number_of_algorithms > MAX_HASH_COUNT ||
- spec_event->number_of_algorithms < 1)
- goto out;
- /*
- * the size of the spec event and placement of vendor_info_size
- * depends on supported algoriths
- */
- spec_event_size =
- offsetof(struct tcg_efi_spec_id_event, digest_sizes) +
- spec_event->number_of_algorithms * sizeof(spec_event->digest_sizes[0]);
- /* no vendor info for us */
- memset(buffer + spec_event_size, 0, 1);
- /* add a byte for vendor_info_size in the spec event */
- spec_event_size += 1;
- *event_size = spec_event_size;
- return EFI_SUCCESS;
- out:
- return ret;
- }
- /**
- * tcg2_uninit - remove the final event table and free efi memory on failures
- */
- void tcg2_uninit(void)
- {
- efi_status_t ret;
- ret = efi_install_configuration_table(&efi_guid_final_events, NULL);
- if (ret != EFI_SUCCESS)
- log_err("Failed to delete final events config table\n");
- efi_free_pool(event_log.buffer);
- event_log.buffer = NULL;
- efi_free_pool(event_log.final_buffer);
- event_log.final_buffer = NULL;
- }
- /**
- * create_final_event() - Create the final event and install the config
- * defined by the TCG EFI spec
- */
- static efi_status_t create_final_event(void)
- {
- struct efi_tcg2_final_events_table *final_event;
- efi_status_t ret;
- /*
- * All events generated after the invocation of
- * EFI_TCG2_GET_EVENT_LOGS need to be stored in an instance of an
- * EFI_CONFIGURATION_TABLE
- */
- ret = efi_allocate_pool(EFI_ACPI_MEMORY_NVS, TPM2_EVENT_LOG_SIZE,
- &event_log.final_buffer);
- if (ret != EFI_SUCCESS)
- goto out;
- memset(event_log.final_buffer, 0xff, TPM2_EVENT_LOG_SIZE);
- final_event = event_log.final_buffer;
- final_event->number_of_events = 0;
- final_event->version = EFI_TCG2_FINAL_EVENTS_TABLE_VERSION;
- event_log.final_pos = sizeof(*final_event);
- ret = efi_install_configuration_table(&efi_guid_final_events,
- final_event);
- if (ret != EFI_SUCCESS) {
- efi_free_pool(event_log.final_buffer);
- event_log.final_buffer = NULL;
- }
- out:
- return ret;
- }
- /**
- * efi_init_event_log() - initialize an eventlog
- */
- static efi_status_t efi_init_event_log(void)
- {
- /*
- * vendor_info_size is currently set to 0, we need to change the length
- * and allocate the flexible array member if this changes
- */
- struct tcg_pcr_event *event_header = NULL;
- struct udevice *dev;
- size_t spec_event_size;
- efi_status_t ret;
- ret = platform_get_tpm2_device(&dev);
- if (ret != EFI_SUCCESS)
- goto out;
- ret = efi_allocate_pool(EFI_BOOT_SERVICES_DATA, TPM2_EVENT_LOG_SIZE,
- (void **)&event_log.buffer);
- if (ret != EFI_SUCCESS)
- goto out;
- /*
- * initialize log area as 0xff so the OS can easily figure out the
- * last log entry
- */
- memset(event_log.buffer, 0xff, TPM2_EVENT_LOG_SIZE);
- event_log.pos = 0;
- event_log.last_event_size = 0;
- event_log.get_event_called = false;
- event_log.truncated = false;
- /*
- * The log header is defined to be in SHA1 event log entry format.
- * Setup event header
- */
- event_header = (struct tcg_pcr_event *)event_log.buffer;
- put_unaligned_le32(0, &event_header->pcr_index);
- put_unaligned_le32(EV_NO_ACTION, &event_header->event_type);
- memset(&event_header->digest, 0, sizeof(event_header->digest));
- ret = create_specid_event(dev, (void *)((uintptr_t)event_log.buffer + sizeof(*event_header)),
- &spec_event_size);
- if (ret != EFI_SUCCESS)
- goto free_pool;
- put_unaligned_le32(spec_event_size, &event_header->event_size);
- event_log.pos = spec_event_size + sizeof(*event_header);
- event_log.last_event_size = event_log.pos;
- ret = create_final_event();
- if (ret != EFI_SUCCESS)
- goto free_pool;
- out:
- return ret;
- free_pool:
- efi_free_pool(event_log.buffer);
- event_log.buffer = NULL;
- return ret;
- }
- /**
- * tcg2_measure_event() - common function to add event log and extend PCR
- *
- * @dev: TPM device
- * @pcr_index: PCR index
- * @event_type: type of event added
- * @size: event size
- * @event: event data
- *
- * Return: status code
- */
- static efi_status_t
- tcg2_measure_event(struct udevice *dev, u32 pcr_index, u32 event_type,
- u32 size, u8 event[])
- {
- struct tpml_digest_values digest_list;
- efi_status_t ret;
- ret = tcg2_create_digest(event, size, &digest_list);
- if (ret != EFI_SUCCESS)
- goto out;
- ret = tcg2_pcr_extend(dev, pcr_index, &digest_list);
- if (ret != EFI_SUCCESS)
- goto out;
- ret = tcg2_agile_log_append(pcr_index, event_type, &digest_list,
- size, event);
- out:
- return ret;
- }
- /**
- * efi_append_scrtm_version - Append an S-CRTM EV_S_CRTM_VERSION event on the
- * eventlog and extend the PCRs
- *
- * @dev: TPM device
- *
- * @Return: status code
- */
- static efi_status_t efi_append_scrtm_version(struct udevice *dev)
- {
- u8 ver[] = U_BOOT_VERSION_STRING;
- efi_status_t ret;
- ret = tcg2_measure_event(dev, 0, EV_S_CRTM_VERSION, sizeof(ver), ver);
- return ret;
- }
- /**
- * tcg2_measure_variable() - add variable event log and extend PCR
- *
- * @dev: TPM device
- * @pcr_index: PCR index
- * @event_type: type of event added
- * @var_name: variable name
- * @guid: guid
- * @data_size: variable data size
- * @data: variable data
- *
- * Return: status code
- */
- static efi_status_t tcg2_measure_variable(struct udevice *dev, u32 pcr_index,
- u32 event_type, u16 *var_name,
- const efi_guid_t *guid,
- efi_uintn_t data_size, u8 *data)
- {
- u32 event_size;
- efi_status_t ret;
- struct efi_tcg2_uefi_variable_data *event;
- event_size = sizeof(event->variable_name) +
- sizeof(event->unicode_name_length) +
- sizeof(event->variable_data_length) +
- (u16_strlen(var_name) * sizeof(u16)) + data_size;
- event = malloc(event_size);
- if (!event)
- return EFI_OUT_OF_RESOURCES;
- guidcpy(&event->variable_name, guid);
- event->unicode_name_length = u16_strlen(var_name);
- event->variable_data_length = data_size;
- memcpy(event->unicode_name, var_name,
- (event->unicode_name_length * sizeof(u16)));
- if (data) {
- memcpy((u16 *)event->unicode_name + event->unicode_name_length,
- data, data_size);
- }
- ret = tcg2_measure_event(dev, pcr_index, event_type, event_size,
- (u8 *)event);
- free(event);
- return ret;
- }
- /**
- * tcg2_measure_boot_variable() - measure boot variables
- *
- * @dev: TPM device
- *
- * Return: status code
- */
- static efi_status_t tcg2_measure_boot_variable(struct udevice *dev)
- {
- u16 *boot_order;
- u16 *boot_index;
- u16 var_name[] = L"BootOrder";
- u16 boot_name[] = L"Boot####";
- u8 *bootvar;
- efi_uintn_t var_data_size;
- u32 count, i;
- efi_status_t ret;
- boot_order = efi_get_var(var_name, &efi_global_variable_guid,
- &var_data_size);
- if (!boot_order) {
- ret = EFI_NOT_FOUND;
- goto error;
- }
- ret = tcg2_measure_variable(dev, 1, EV_EFI_VARIABLE_BOOT2, var_name,
- &efi_global_variable_guid, var_data_size,
- (u8 *)boot_order);
- if (ret != EFI_SUCCESS)
- goto error;
- count = var_data_size / sizeof(*boot_order);
- boot_index = boot_order;
- for (i = 0; i < count; i++) {
- efi_create_indexed_name(boot_name, sizeof(boot_name),
- "Boot", *boot_index++);
- bootvar = efi_get_var(boot_name, &efi_global_variable_guid,
- &var_data_size);
- if (!bootvar) {
- log_info("%ls not found\n", boot_name);
- continue;
- }
- ret = tcg2_measure_variable(dev, 1, EV_EFI_VARIABLE_BOOT2,
- boot_name,
- &efi_global_variable_guid,
- var_data_size, bootvar);
- free(bootvar);
- if (ret != EFI_SUCCESS)
- goto error;
- }
- error:
- free(boot_order);
- return ret;
- }
- /**
- * efi_tcg2_measure_efi_app_invocation() - measure efi app invocation
- *
- * Return: status code
- */
- efi_status_t efi_tcg2_measure_efi_app_invocation(void)
- {
- efi_status_t ret;
- u32 pcr_index;
- struct udevice *dev;
- u32 event = 0;
- if (tcg2_efi_app_invoked)
- return EFI_SUCCESS;
- ret = platform_get_tpm2_device(&dev);
- if (ret != EFI_SUCCESS)
- return ret;
- ret = tcg2_measure_boot_variable(dev);
- if (ret != EFI_SUCCESS)
- goto out;
- ret = tcg2_measure_event(dev, 4, EV_EFI_ACTION,
- strlen(EFI_CALLING_EFI_APPLICATION),
- (u8 *)EFI_CALLING_EFI_APPLICATION);
- if (ret != EFI_SUCCESS)
- goto out;
- for (pcr_index = 0; pcr_index <= 7; pcr_index++) {
- ret = tcg2_measure_event(dev, pcr_index, EV_SEPARATOR,
- sizeof(event), (u8 *)&event);
- if (ret != EFI_SUCCESS)
- goto out;
- }
- tcg2_efi_app_invoked = true;
- out:
- return ret;
- }
- /**
- * efi_tcg2_measure_efi_app_exit() - measure efi app exit
- *
- * Return: status code
- */
- efi_status_t efi_tcg2_measure_efi_app_exit(void)
- {
- efi_status_t ret;
- struct udevice *dev;
- ret = platform_get_tpm2_device(&dev);
- if (ret != EFI_SUCCESS)
- return ret;
- ret = tcg2_measure_event(dev, 4, EV_EFI_ACTION,
- strlen(EFI_RETURNING_FROM_EFI_APPLICATION),
- (u8 *)EFI_RETURNING_FROM_EFI_APPLICATION);
- return ret;
- }
- /**
- * efi_tcg2_notify_exit_boot_services() - ExitBootService callback
- *
- * @event: callback event
- * @context: callback context
- */
- static void EFIAPI
- efi_tcg2_notify_exit_boot_services(struct efi_event *event, void *context)
- {
- efi_status_t ret;
- struct udevice *dev;
- EFI_ENTRY("%p, %p", event, context);
- ret = platform_get_tpm2_device(&dev);
- if (ret != EFI_SUCCESS)
- goto out;
- ret = tcg2_measure_event(dev, 5, EV_EFI_ACTION,
- strlen(EFI_EXIT_BOOT_SERVICES_INVOCATION),
- (u8 *)EFI_EXIT_BOOT_SERVICES_INVOCATION);
- if (ret != EFI_SUCCESS)
- goto out;
- ret = tcg2_measure_event(dev, 5, EV_EFI_ACTION,
- strlen(EFI_EXIT_BOOT_SERVICES_SUCCEEDED),
- (u8 *)EFI_EXIT_BOOT_SERVICES_SUCCEEDED);
- out:
- EFI_EXIT(ret);
- }
- /**
- * efi_tcg2_notify_exit_boot_services_failed()
- * - notify ExitBootServices() is failed
- *
- * Return: status code
- */
- efi_status_t efi_tcg2_notify_exit_boot_services_failed(void)
- {
- struct udevice *dev;
- efi_status_t ret;
- ret = platform_get_tpm2_device(&dev);
- if (ret != EFI_SUCCESS)
- goto out;
- ret = tcg2_measure_event(dev, 5, EV_EFI_ACTION,
- strlen(EFI_EXIT_BOOT_SERVICES_INVOCATION),
- (u8 *)EFI_EXIT_BOOT_SERVICES_INVOCATION);
- if (ret != EFI_SUCCESS)
- goto out;
- ret = tcg2_measure_event(dev, 5, EV_EFI_ACTION,
- strlen(EFI_EXIT_BOOT_SERVICES_FAILED),
- (u8 *)EFI_EXIT_BOOT_SERVICES_FAILED);
- out:
- return ret;
- }
- /**
- * tcg2_measure_secure_boot_variable() - measure secure boot variables
- *
- * @dev: TPM device
- *
- * Return: status code
- */
- static efi_status_t tcg2_measure_secure_boot_variable(struct udevice *dev)
- {
- u8 *data;
- efi_uintn_t data_size;
- u32 count, i;
- efi_status_t ret;
- count = ARRAY_SIZE(secure_variables);
- for (i = 0; i < count; i++) {
- /*
- * According to the TCG2 PC Client PFP spec, "SecureBoot",
- * "PK", "KEK", "db" and "dbx" variables must be measured
- * even if they are empty.
- */
- data = efi_get_var(secure_variables[i].name,
- secure_variables[i].guid,
- &data_size);
- ret = tcg2_measure_variable(dev, 7,
- EV_EFI_VARIABLE_DRIVER_CONFIG,
- secure_variables[i].name,
- secure_variables[i].guid,
- data_size, data);
- free(data);
- if (ret != EFI_SUCCESS)
- goto error;
- }
- /*
- * TCG2 PC Client PFP spec says "dbt" and "dbr" are
- * measured if present and not empty.
- */
- data = efi_get_var(L"dbt",
- &efi_guid_image_security_database,
- &data_size);
- if (data) {
- ret = tcg2_measure_variable(dev, 7,
- EV_EFI_VARIABLE_DRIVER_CONFIG,
- L"dbt",
- &efi_guid_image_security_database,
- data_size, data);
- free(data);
- }
- data = efi_get_var(L"dbr",
- &efi_guid_image_security_database,
- &data_size);
- if (data) {
- ret = tcg2_measure_variable(dev, 7,
- EV_EFI_VARIABLE_DRIVER_CONFIG,
- L"dbr",
- &efi_guid_image_security_database,
- data_size, data);
- free(data);
- }
- error:
- return ret;
- }
- /**
- * efi_tcg2_register() - register EFI_TCG2_PROTOCOL
- *
- * If a TPM2 device is available, the TPM TCG2 Protocol is registered
- *
- * Return: An error status is only returned if adding the protocol fails.
- */
- efi_status_t efi_tcg2_register(void)
- {
- efi_status_t ret = EFI_SUCCESS;
- struct udevice *dev;
- struct efi_event *event;
- ret = platform_get_tpm2_device(&dev);
- if (ret != EFI_SUCCESS) {
- log_warning("Unable to find TPMv2 device\n");
- return EFI_SUCCESS;
- }
- ret = efi_init_event_log();
- if (ret != EFI_SUCCESS)
- goto fail;
- ret = efi_append_scrtm_version(dev);
- if (ret != EFI_SUCCESS) {
- tcg2_uninit();
- goto fail;
- }
- ret = efi_add_protocol(efi_root, &efi_guid_tcg2_protocol,
- (void *)&efi_tcg2_protocol);
- if (ret != EFI_SUCCESS) {
- tcg2_uninit();
- goto fail;
- }
- ret = efi_create_event(EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_CALLBACK,
- efi_tcg2_notify_exit_boot_services, NULL,
- NULL, &event);
- if (ret != EFI_SUCCESS) {
- tcg2_uninit();
- goto fail;
- }
- ret = tcg2_measure_secure_boot_variable(dev);
- if (ret != EFI_SUCCESS) {
- tcg2_uninit();
- goto fail;
- }
- return ret;
- fail:
- log_err("Cannot install EFI_TCG2_PROTOCOL\n");
- /*
- * Return EFI_SUCCESS and don't stop the EFI subsystem.
- * That's done for 2 reasons
- * - If the protocol is not installed the PCRs won't be extended. So
- * someone later in the boot flow will notice that and take the
- * necessary actions.
- * - The TPM sandbox is limited and we won't be able to run any efi
- * related tests with TCG2 enabled
- */
- return EFI_SUCCESS;
- }
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