diff options
Diffstat (limited to 'lib/efi_loader/efi_tcg2.c')
| -rw-r--r-- | lib/efi_loader/efi_tcg2.c | 1619 |
1 files changed, 1619 insertions, 0 deletions
diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c new file mode 100644 index 00000000000..b07e0099c27 --- /dev/null +++ b/lib/efi_loader/efi_tcg2.c @@ -0,0 +1,1619 @@ +// 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 <dm.h> +#include <efi_loader.h> +#include <efi_variable.h> +#include <efi_tcg2.h> +#include <log.h> +#include <malloc.h> +#include <smbios.h> +#include <version_string.h> +#include <tpm-v2.h> +#include <tpm_api.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/be_byteshift.h> +#include <linux/unaligned/le_byteshift.h> +#include <linux/unaligned/generic.h> +#include <hexdump.h> + +/** + * struct event_log_buffer - internal eventlog management structure + * + * @buffer: eventlog buffer + * @final_buffer: finalevent config table buffer + * @pos: current position of 'buffer' + * @final_pos: current position of 'final_buffer' + * @get_event_called: true if GetEventLog has been invoked at least once + * @ebs_called: true if ExitBootServices has been invoked + * @truncated: true if the 'buffer' is truncated + */ +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 ebs_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 variable_info { + const u16 *name; + bool accept_empty; + u32 pcr_index; +}; + +static struct variable_info secure_variables[] = { + {u"SecureBoot", true, 7}, + {u"PK", true, 7}, + {u"KEK", true, 7}, + {u"db", true, 7}, + {u"dbx", true, 7}, + {u"dbt", false, 7}, + {u"dbr", false, 7}, + {u"DeployedMode", false, 1}, + {u"AuditMode", false, 1}, +}; + +static bool is_tcg2_protocol_installed(void) +{ + struct efi_handler *handler; + efi_status_t ret; + + ret = efi_search_protocol(efi_root, &efi_guid_tcg2_protocol, &handler); + return ret == EFI_SUCCESS; +} + +/* tcg2_agile_log_append - Append an agile event to an 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 + * @log: log buffer to append the event + * + * @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); + u32 event_size = size + tcg2_event_get_size(digest_list); + struct efi_tcg2_final_events_table *final_event; + efi_status_t ret = EFI_SUCCESS; + + /* if ExitBootServices hasn't been called update the normal log */ + if (!event_log.ebs_called) { + if (event_log.truncated || + event_log.pos + event_size > TPM2_EVENT_LOG_SIZE) { + event_log.truncated = true; + return EFI_VOLUME_FULL; + } + tcg2_log_append(pcr_index, event_type, digest_list, size, event, log); + event_log.pos += event_size; + event_log.last_event_size = event_size; + } + + if (!event_log.get_event_called) + return ret; + + /* if GetEventLog has been called update FinalEventLog as well */ + if (event_log.final_pos + event_size > TPM2_EVENT_LOG_SIZE) + return EFI_VOLUME_FULL; + + log = (void *)((uintptr_t)event_log.final_buffer + event_log.final_pos); + tcg2_log_append(pcr_index, event_type, digest_list, size, event, log); + + final_event = event_log.final_buffer; + final_event->number_of_events++; + event_log.final_pos += event_size; + + return ret; +} + +/** + * 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; +} + +/** + * 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 = tcg2_platform_get_tpm2(&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 = tcg2_platform_get_tpm2(&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]; + struct udevice *dev; + 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 = tcg2_platform_get_tpm2(&dev); + if (ret != EFI_SUCCESS) + goto out; + + ret = tcg2_get_active_pcr_banks(dev, &active); + if (ret != EFI_SUCCESS) { + goto out; + } + + digest_list->count = 0; + for (i = 0; i < ARRAY_SIZE(tpm2_supported_algorithms); i++) { + u16 hash_alg = tpm2_supported_algorithms[i]; + + if (!(active & tpm2_algorithm_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: + continue; + } + digest_list->digests[digest_list->count].hash_alg = hash_alg; + memcpy(&digest_list->digests[digest_list->count].digest, hash, + (u32)tpm2_algorithm_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; + + if (!is_tcg2_protocol_installed()) + return EFI_SUCCESS; + + ret = tcg2_platform_get_tpm2(&dev); + if (ret != EFI_SUCCESS) + return EFI_SECURITY_VIOLATION; + + 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 = tcg2_platform_get_tpm2(&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(dev, (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(struct efi_tcg2_protocol *this, + u32 input_param_block_size, + u8 *input_param_block, + u32 output_param_block_size, + u8 *output_param_block) +{ + struct udevice *dev; + efi_status_t ret; + u32 rc; + size_t resp_buf_size = output_param_block_size; + + EFI_ENTRY("%p, %u, %p, %u, %p", this, input_param_block_size, + input_param_block, output_param_block_size, output_param_block); + + if (!this || !input_param_block || !input_param_block_size) { + ret = EFI_INVALID_PARAMETER; + goto out; + } + + ret = tcg2_platform_get_tpm2(&dev); + if (ret != EFI_SUCCESS) + goto out; + + rc = tpm2_submit_command(dev, input_param_block, + output_param_block, &resp_buf_size); + if (rc) { + ret = (rc == -ENOSPC) ? EFI_OUT_OF_RESOURCES : EFI_DEVICE_ERROR; + + goto out; + } + +out: + return EFI_EXIT(ret); +} + +/** + * 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) +{ + struct udevice *dev; + efi_status_t ret; + + EFI_ENTRY("%p, %p", this, active_pcr_banks); + + if (!this || !active_pcr_banks) { + ret = EFI_INVALID_PARAMETER; + goto out; + } + ret = tcg2_platform_get_tpm2(&dev); + if (ret != EFI_SUCCESS) + goto out; + + ret = tcg2_get_active_pcr_banks(dev, 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, +}; + +/** + * 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; + + if (!is_tcg2_protocol_installed()) + return; + + ret = efi_uninstall_multiple_protocol_interfaces(efi_root, &efi_guid_tcg2_protocol, + &efi_tcg2_protocol, NULL); + if (ret != EFI_SUCCESS) + log_err("Failed to remove EFI TCG2 protocol\n"); +} + +/** + * 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; +} + +/** + * 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 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(dev, 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) +{ + efi_status_t ret; + + ret = measure_event(dev, 0, EV_S_CRTM_VERSION, + strlen(version_string) + 1, (u8 *)version_string); + + return ret; +} + +/** + * efi_init_event_log() - initialize an eventlog + * + * Return: status code + */ +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 tcg2_event_log elog; + struct udevice *dev; + efi_status_t ret; + + ret = tcg2_platform_get_tpm2(&dev); + if (ret != EFI_SUCCESS) + return ret; + + ret = efi_allocate_pool(EFI_BOOT_SERVICES_DATA, TPM2_EVENT_LOG_SIZE, + (void **)&event_log.buffer); + if (ret != EFI_SUCCESS) + return ret; + + /* + * 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); + + /* + * The log header is defined to be in SHA1 event log entry format. + * Setup event header + */ + event_log.pos = 0; + event_log.last_event_size = 0; + event_log.get_event_called = false; + event_log.ebs_called = false; + event_log.truncated = false; + + /* + * Check if earlier firmware have passed any eventlog. Different + * platforms can use different ways to do so. + */ + elog.log = event_log.buffer; + elog.log_size = TPM2_EVENT_LOG_SIZE; + ret = tcg2_log_prepare_buffer(dev, &elog, false); + if (ret != EFI_SUCCESS) + goto free_pool; + + event_log.pos = elog.log_position; + + /* + * Add SCRTM version to the log if previous firmmware + * doesn't pass an eventlog. + */ + if (!elog.found) { + ret = efi_append_scrtm_version(dev); + if (ret != EFI_SUCCESS) + goto free_pool; + } + + ret = create_final_event(); + if (ret != EFI_SUCCESS) + goto free_pool; + + return ret; + +free_pool: + efi_free_pool(event_log.buffer); + event_log.buffer = NULL; + 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, const 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 = 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[] = u"BootOrder"; + u16 boot_name[] = u"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) { + /* If "BootOrder" is not defined, skip the boot variable measurement */ + return EFI_SUCCESS; + } + + 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_debug("%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; +} + +/** + * tcg2_measure_smbios() - measure smbios table + * + * @dev: TPM device + * @entry: pointer to the smbios_entry structure + * + * Return: status code + */ +static efi_status_t +tcg2_measure_smbios(struct udevice *dev, + const struct smbios3_entry *entry) +{ + efi_status_t ret; + struct smbios_header *smbios_copy; + struct smbios_handoff_table_pointers2 *event = NULL; + u32 event_size; + const char smbios3_anchor[] = "_SM3_"; + + /* We only support SMBIOS 3.0 Entry Point structure */ + if (memcmp(entry->anchor, smbios3_anchor, sizeof(smbios3_anchor) - 1)) + return EFI_UNSUPPORTED; + + /* + * TCG PC Client PFP Spec says + * "SMBIOS structures that contain static configuration information + * (e.g. Platform Manufacturer Enterprise Number assigned by IANA, + * platform model number, Vendor and Device IDs for each SMBIOS table) + * that is relevant to the security of the platform MUST be measured". + * Device dependent parameters such as serial number are cleared to + * zero or spaces for the measurement. + */ + event_size = sizeof(struct smbios_handoff_table_pointers2) + + FIELD_SIZEOF(struct efi_configuration_table, guid) + + entry->table_maximum_size; + event = calloc(1, event_size); + if (!event) { + ret = EFI_OUT_OF_RESOURCES; + goto out; + } + + event->table_description_size = sizeof(SMBIOS_HANDOFF_TABLE_DESC); + memcpy(event->table_description, SMBIOS_HANDOFF_TABLE_DESC, + sizeof(SMBIOS_HANDOFF_TABLE_DESC)); + put_unaligned_le64(1, &event->number_of_tables); + guidcpy(&event->table_entry[0].guid, &smbios3_guid); + smbios_copy = (struct smbios_header *)((uintptr_t)&event->table_entry[0].table); + memcpy(&event->table_entry[0].table, + (void *)((uintptr_t)entry->struct_table_address), + entry->table_maximum_size); + + smbios_prepare_measurement(entry, smbios_copy); + + ret = measure_event(dev, 1, EV_EFI_HANDOFF_TABLES2, event_size, + (u8 *)event); + if (ret != EFI_SUCCESS) + goto out; + +out: + free(event); + + return ret; +} + +/** + * tcg2_measure_gpt_table() - measure gpt table + * + * @dev: TPM device + * @loaded_image: handle to the loaded image + * + * Return: status code + */ +static efi_status_t +tcg2_measure_gpt_data(struct udevice *dev, + struct efi_loaded_image_obj *loaded_image) +{ + efi_status_t ret; + efi_handle_t handle; + struct efi_handler *dp_handler, *io_handler; + struct efi_device_path *orig_device_path; + struct efi_device_path *device_path; + struct efi_device_path *dp; + struct efi_block_io *block_io; + struct efi_gpt_data *event = NULL; + efi_guid_t null_guid = NULL_GUID; + gpt_header *gpt_h; + gpt_entry *entry = NULL; + gpt_entry *gpt_e; + u32 num_of_valid_entry = 0; + u32 event_size; + u32 i; + u32 total_gpt_entry_size; + + ret = efi_search_protocol(&loaded_image->header, + &efi_guid_loaded_image_device_path, + &dp_handler); + if (ret != EFI_SUCCESS) + return ret; + + orig_device_path = dp_handler->protocol_interface; + if (!orig_device_path) /* no device path, skip GPT measurement */ + return EFI_SUCCESS; + + device_path = efi_dp_dup(orig_device_path); + if (!device_path) + return EFI_OUT_OF_RESOURCES; + + dp = search_gpt_dp_node(device_path); + if (!dp) { + /* no GPT device path node found, skip GPT measurement */ + ret = EFI_SUCCESS; + goto out1; + } + + /* read GPT header */ + dp->type = DEVICE_PATH_TYPE_END; + dp->sub_type = DEVICE_PATH_SUB_TYPE_END; + dp = device_path; + ret = EFI_CALL(systab.boottime->locate_device_path(&efi_block_io_guid, + &dp, &handle)); + if (ret != EFI_SUCCESS) + goto out1; + + ret = efi_search_protocol(handle, &efi_block_io_guid, &io_handler); + if (ret != EFI_SUCCESS) + goto out1; + block_io = io_handler->protocol_interface; + + gpt_h = memalign(block_io->media->io_align, block_io->media->block_size); + if (!gpt_h) { + ret = EFI_OUT_OF_RESOURCES; + goto out2; + } + + ret = block_io->read_blocks(block_io, block_io->media->media_id, 1, + block_io->media->block_size, gpt_h); + if (ret != EFI_SUCCESS) + goto out2; + + /* read GPT entry */ + total_gpt_entry_size = gpt_h->num_partition_entries * + gpt_h->sizeof_partition_entry; + entry = memalign(block_io->media->io_align, total_gpt_entry_size); + if (!entry) { + ret = EFI_OUT_OF_RESOURCES; + goto out2; + } + + ret = block_io->read_blocks(block_io, block_io->media->media_id, + gpt_h->partition_entry_lba, + total_gpt_entry_size, entry); + if (ret != EFI_SUCCESS) + goto out2; + + /* count valid GPT entry */ + gpt_e = entry; + for (i = 0; i < gpt_h->num_partition_entries; i++) { + if (guidcmp(&null_guid, &gpt_e->partition_type_guid)) + num_of_valid_entry++; + + gpt_e = (gpt_entry *)((u8 *)gpt_e + gpt_h->sizeof_partition_entry); + } + + /* prepare event data for measurement */ + event_size = sizeof(struct efi_gpt_data) + + (num_of_valid_entry * gpt_h->sizeof_partition_entry); + event = calloc(1, event_size); + if (!event) { + ret = EFI_OUT_OF_RESOURCES; + goto out2; + } + memcpy(event, gpt_h, sizeof(gpt_header)); + put_unaligned_le64(num_of_valid_entry, &event->number_of_partitions); + + /* copy valid GPT entry */ + gpt_e = entry; + num_of_valid_entry = 0; + for (i = 0; i < gpt_h->num_partition_entries; i++) { + if (guidcmp(&null_guid, &gpt_e->partition_type_guid)) { + memcpy((u8 *)event->partitions + + (num_of_valid_entry * gpt_h->sizeof_partition_entry), + gpt_e, gpt_h->sizeof_partition_entry); + num_of_valid_entry++; + } + + gpt_e = (gpt_entry *)((u8 *)gpt_e + gpt_h->sizeof_partition_entry); + } + + ret = measure_event(dev, 5, EV_EFI_GPT_EVENT, event_size, (u8 *)event); + +out2: + free(gpt_h); + free(entry); + free(event); +out1: + efi_free_pool(device_path); + + return ret; +} + +/* Return the byte size of reserved map area in DTB or -1 upon error */ +static ssize_t size_of_rsvmap(void *dtb) +{ + struct fdt_reserve_entry e; + ssize_t size_max; + ssize_t size; + u8 *rsvmap_base; + + rsvmap_base = (u8 *)dtb + fdt_off_mem_rsvmap(dtb); + size_max = fdt_totalsize(dtb) - fdt_off_mem_rsvmap(dtb); + size = 0; + + do { + memcpy(&e, rsvmap_base + size, sizeof(e)); + size += sizeof(e); + if (size > size_max) + return -1; + } while (e.size); + + return size; +} + +/** + * efi_tcg2_measure_dtb() - measure DTB passed to the OS + * + * @dtb: pointer to the device tree blob + * + * Return: status code + */ +efi_status_t efi_tcg2_measure_dtb(void *dtb) +{ + struct uefi_platform_firmware_blob2 *blob; + struct fdt_header *header; + sha256_context hash_ctx; + struct udevice *dev; + ssize_t rsvmap_size; + efi_status_t ret; + u32 event_size; + + if (!is_tcg2_protocol_installed()) + return EFI_SUCCESS; + + ret = tcg2_platform_get_tpm2(&dev); + if (ret != EFI_SUCCESS) + return EFI_SECURITY_VIOLATION; + + rsvmap_size = size_of_rsvmap(dtb); + if (rsvmap_size < 0) + return EFI_SECURITY_VIOLATION; + + event_size = sizeof(*blob) + sizeof(EFI_DTB_EVENT_STRING) + SHA256_SUM_LEN; + blob = calloc(1, event_size); + if (!blob) + return EFI_OUT_OF_RESOURCES; + + blob->blob_description_size = sizeof(EFI_DTB_EVENT_STRING); + memcpy(blob->data, EFI_DTB_EVENT_STRING, blob->blob_description_size); + + /* Measure populated areas of the DTB */ + header = dtb; + sha256_starts(&hash_ctx); + sha256_update(&hash_ctx, (u8 *)header, sizeof(struct fdt_header)); + sha256_update(&hash_ctx, (u8 *)dtb + fdt_off_dt_struct(dtb), fdt_size_dt_strings(dtb)); + sha256_update(&hash_ctx, (u8 *)dtb + fdt_off_dt_strings(dtb), fdt_size_dt_struct(dtb)); + sha256_update(&hash_ctx, (u8 *)dtb + fdt_off_mem_rsvmap(dtb), rsvmap_size); + sha256_finish(&hash_ctx, blob->data + blob->blob_description_size); + + ret = measure_event(dev, 0, EV_POST_CODE, event_size, (u8 *)blob); + + free(blob); + return ret; +} + +/** + * efi_tcg2_measure_efi_app_invocation() - measure efi app invocation + * + * Return: status code + */ +efi_status_t efi_tcg2_measure_efi_app_invocation(struct efi_loaded_image_obj *handle) +{ + efi_status_t ret; + u32 pcr_index; + struct udevice *dev; + u32 event = 0; + struct smbios3_entry *entry; + + if (!is_tcg2_protocol_installed()) + return EFI_SUCCESS; + + if (tcg2_efi_app_invoked) + return EFI_SUCCESS; + + ret = tcg2_platform_get_tpm2(&dev); + if (ret != EFI_SUCCESS) + return EFI_SECURITY_VIOLATION; + + ret = tcg2_measure_boot_variable(dev); + if (ret != EFI_SUCCESS) + goto out; + + ret = measure_event(dev, 4, EV_EFI_ACTION, + strlen(EFI_CALLING_EFI_APPLICATION), + (u8 *)EFI_CALLING_EFI_APPLICATION); + if (ret != EFI_SUCCESS) + goto out; + + entry = efi_get_configuration_table(&smbios3_guid); + if (entry) { + ret = tcg2_measure_smbios(dev, entry); + if (ret != EFI_SUCCESS) + goto out; + } + + ret = tcg2_measure_gpt_data(dev, handle); + if (ret != EFI_SUCCESS) + goto out; + + for (pcr_index = 0; pcr_index <= 7; pcr_index++) { + ret = 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; + + if (!is_tcg2_protocol_installed()) + return EFI_SUCCESS; + + ret = tcg2_platform_get_tpm2(&dev); + if (ret != EFI_SUCCESS) + return ret; + + ret = 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); + + event_log.ebs_called = true; + + if (!is_tcg2_protocol_installed()) { + ret = EFI_SUCCESS; + goto out; + } + + ret = tcg2_platform_get_tpm2(&dev); + if (ret != EFI_SUCCESS) + goto out; + + ret = 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 = 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; + + if (!is_tcg2_protocol_installed()) + return EFI_SUCCESS; + + ret = tcg2_platform_get_tpm2(&dev); + if (ret != EFI_SUCCESS) + goto out; + + ret = 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 = 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; + u8 deployed_mode; + efi_uintn_t size; + u32 deployed_audit_pcr_index = 1; + + size = sizeof(deployed_mode); + ret = efi_get_variable_int(u"DeployedMode", &efi_global_variable_guid, + NULL, &size, &deployed_mode, NULL); + if (ret != EFI_SUCCESS || !deployed_mode) + deployed_audit_pcr_index = 7; + + count = ARRAY_SIZE(secure_variables); + for (i = 0; i < count; i++) { + const efi_guid_t *guid; + + guid = efi_auth_var_get_guid(secure_variables[i].name); + + data = efi_get_var(secure_variables[i].name, guid, &data_size); + if (!data && !secure_variables[i].accept_empty) + continue; + + if (u16_strcmp(u"DeployedMode", secure_variables[i].name)) + secure_variables[i].pcr_index = deployed_audit_pcr_index; + if (u16_strcmp(u"AuditMode", secure_variables[i].name)) + secure_variables[i].pcr_index = deployed_audit_pcr_index; + + ret = tcg2_measure_variable(dev, secure_variables[i].pcr_index, + EV_EFI_VARIABLE_DRIVER_CONFIG, + secure_variables[i].name, guid, + data_size, data); + free(data); + if (ret != EFI_SUCCESS) + goto error; + } + +error: + return ret; +} + +/** + * efi_tcg2_do_initial_measurement() - do initial measurement + * + * Return: status code + */ +efi_status_t efi_tcg2_do_initial_measurement(void) +{ + efi_status_t ret; + struct udevice *dev; + + if (!is_tcg2_protocol_installed()) + return EFI_SUCCESS; + + ret = tcg2_platform_get_tpm2(&dev); + if (ret != EFI_SUCCESS) + return EFI_SECURITY_VIOLATION; + + ret = tcg2_measure_secure_boot_variable(dev); + if (ret != EFI_SUCCESS) + goto out; + +out: + return ret; +} + +/** + * efi_tcg2_register() - register EFI_TCG2_PROTOCOL + * + * If a TPM2 device is available, the TPM TCG2 Protocol is registered + * + * Return: status code + */ +efi_status_t efi_tcg2_register(void) +{ + efi_status_t ret = EFI_SUCCESS; + struct udevice *dev; + struct efi_event *event; + u32 err; + + ret = tcg2_platform_get_tpm2(&dev); + if (ret != EFI_SUCCESS) { + log_warning("Missing TPMv2 device for EFI_TCG_PROTOCOL\n"); + return EFI_SUCCESS; + } + + /* initialize the TPM as early as possible. */ + err = tpm_auto_start(dev); + if (err) { + log_err("TPM startup failed\n"); + goto fail; + } + + ret = efi_init_event_log(); + if (ret != EFI_SUCCESS) { + tcg2_uninit(); + goto fail; + } + + ret = efi_install_multiple_protocol_interfaces(&efi_root, &efi_guid_tcg2_protocol, + &efi_tcg2_protocol, NULL); + 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; + } + + return ret; + +fail: + log_err("Cannot install EFI_TCG2_PROTOCOL\n"); + return ret; +} |