mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-19 17:53:08 +00:00
d12c3efe53
If the hard coded array hash_algo_list[] contains an entry for an
unsupported algorithm, we should not leak resources new_efi and regs.
We should still extend the log with the digests for the supported
algorithms and not write any message.
The same holds true of tcg2_create_digest(): just continue in case
hash_algo_list[] contains an unsupported entry.
Fixes: 163a0d7e2c
("efi_loader: add PE/COFF image measurement")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
2528 lines
64 KiB
C
2528 lines
64 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Defines APIs that allow an OS to interact with UEFI firmware to query
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* information about the device.
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* https://trustedcomputinggroup.org/resource/tcg-efi-protocol-specification/
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*
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* Copyright (c) 2020, Linaro Limited
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*/
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#define LOG_CATEGORY LOGC_EFI
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#include <common.h>
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#include <dm.h>
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#include <efi_loader.h>
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#include <efi_variable.h>
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#include <efi_tcg2.h>
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#include <log.h>
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#include <malloc.h>
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#include <smbios.h>
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#include <version_string.h>
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#include <tpm-v2.h>
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#include <tpm_api.h>
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#include <u-boot/hash-checksum.h>
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#include <u-boot/sha1.h>
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#include <u-boot/sha256.h>
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#include <u-boot/sha512.h>
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#include <linux/unaligned/be_byteshift.h>
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#include <linux/unaligned/le_byteshift.h>
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#include <linux/unaligned/generic.h>
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#include <hexdump.h>
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/**
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* struct event_log_buffer - internal eventlog management structure
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*
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* @buffer: eventlog buffer
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* @final_buffer: finalevent config table buffer
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* @pos: current position of 'buffer'
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* @final_pos: current position of 'final_buffer'
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* @get_event_called: true if GetEventLog has been invoked at least once
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* @ebs_called: true if ExitBootServices has been invoked
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* @truncated: true if the 'buffer' is truncated
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*/
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struct event_log_buffer {
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void *buffer;
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void *final_buffer;
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size_t pos; /* eventlog position */
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size_t final_pos; /* final events config table position */
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size_t last_event_size;
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bool get_event_called;
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bool ebs_called;
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bool truncated;
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};
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static struct event_log_buffer event_log;
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static bool tcg2_efi_app_invoked;
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/*
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* When requesting TPM2_CAP_TPM_PROPERTIES the value is on a standard offset.
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* Since the current tpm2_get_capability() response buffers starts at
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* 'union tpmu_capabilities data' of 'struct tpms_capability_data', calculate
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* the response size and offset once for all consumers
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*/
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#define TPM2_RESPONSE_BUFFER_SIZE (sizeof(struct tpms_capability_data) - \
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offsetof(struct tpms_capability_data, data))
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#define properties_offset (offsetof(struct tpml_tagged_tpm_property, tpm_property) + \
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offsetof(struct tpms_tagged_property, value))
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static const efi_guid_t efi_guid_tcg2_protocol = EFI_TCG2_PROTOCOL_GUID;
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static const efi_guid_t efi_guid_final_events = EFI_TCG2_FINAL_EVENTS_TABLE_GUID;
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struct digest_info {
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u16 hash_alg;
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u32 hash_mask;
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u16 hash_len;
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};
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static const struct digest_info hash_algo_list[] = {
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{
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TPM2_ALG_SHA1,
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EFI_TCG2_BOOT_HASH_ALG_SHA1,
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TPM2_SHA1_DIGEST_SIZE,
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},
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{
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TPM2_ALG_SHA256,
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EFI_TCG2_BOOT_HASH_ALG_SHA256,
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TPM2_SHA256_DIGEST_SIZE,
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},
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{
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TPM2_ALG_SHA384,
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EFI_TCG2_BOOT_HASH_ALG_SHA384,
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TPM2_SHA384_DIGEST_SIZE,
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},
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{
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TPM2_ALG_SHA512,
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EFI_TCG2_BOOT_HASH_ALG_SHA512,
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TPM2_SHA512_DIGEST_SIZE,
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},
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};
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struct variable_info {
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const u16 *name;
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bool accept_empty;
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u32 pcr_index;
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};
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static struct variable_info secure_variables[] = {
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{u"SecureBoot", true, 7},
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{u"PK", true, 7},
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{u"KEK", true, 7},
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{u"db", true, 7},
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{u"dbx", true, 7},
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{u"dbt", false, 7},
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{u"dbr", false, 7},
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{u"DeployedMode", false, 1},
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{u"AuditMode", false, 1},
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};
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#define MAX_HASH_COUNT ARRAY_SIZE(hash_algo_list)
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/**
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* alg_to_mask - Get a TCG hash mask for algorithms
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*
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* @hash_alg: TCG defined algorithm
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*
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* @Return: TCG hashing algorithm bitmaps, 0 if the algorithm is not supported
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*/
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static u32 alg_to_mask(u16 hash_alg)
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{
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size_t i;
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for (i = 0; i < MAX_HASH_COUNT; i++) {
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if (hash_algo_list[i].hash_alg == hash_alg)
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return hash_algo_list[i].hash_mask;
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}
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return 0;
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}
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/**
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* alg_to_len - Get a TCG hash len for algorithms
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*
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* @hash_alg: TCG defined algorithm
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*
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* @Return: len of chosen algorithm, 0 if the algorithm is not supported
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*/
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static u16 alg_to_len(u16 hash_alg)
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{
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size_t i;
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for (i = 0; i < MAX_HASH_COUNT; i++) {
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if (hash_algo_list[i].hash_alg == hash_alg)
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return hash_algo_list[i].hash_len;
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}
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return 0;
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}
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static bool is_tcg2_protocol_installed(void)
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{
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struct efi_handler *handler;
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efi_status_t ret;
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ret = efi_search_protocol(efi_root, &efi_guid_tcg2_protocol, &handler);
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return ret == EFI_SUCCESS;
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}
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static u32 tcg_event_final_size(struct tpml_digest_values *digest_list)
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{
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u32 len;
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size_t i;
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len = offsetof(struct tcg_pcr_event2, digests);
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len += offsetof(struct tpml_digest_values, digests);
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for (i = 0; i < digest_list->count; i++) {
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u16 hash_alg = digest_list->digests[i].hash_alg;
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len += offsetof(struct tpmt_ha, digest);
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len += alg_to_len(hash_alg);
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}
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len += sizeof(u32); /* tcg_pcr_event2 event_size*/
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return len;
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}
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/* tcg2_pcr_extend - Extend PCRs for a TPM2 device for a given tpml_digest_values
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*
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* @dev: device
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* @digest_list: list of digest algorithms to extend
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*
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* @Return: status code
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*/
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static efi_status_t tcg2_pcr_extend(struct udevice *dev, u32 pcr_index,
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struct tpml_digest_values *digest_list)
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{
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u32 rc;
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size_t i;
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for (i = 0; i < digest_list->count; i++) {
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u32 alg = digest_list->digests[i].hash_alg;
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rc = tpm2_pcr_extend(dev, pcr_index, alg,
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(u8 *)&digest_list->digests[i].digest,
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alg_to_len(alg));
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if (rc) {
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EFI_PRINT("Failed to extend PCR\n");
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return EFI_DEVICE_ERROR;
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}
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}
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return EFI_SUCCESS;
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}
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/* tcg2_pcr_read - Read PCRs for a TPM2 device for a given tpml_digest_values
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*
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* @dev: device
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* @pcr_index: PCR index
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* @digest_list: list of digest algorithms to extend
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*
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* @Return: status code
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*/
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static efi_status_t tcg2_pcr_read(struct udevice *dev, u32 pcr_index,
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struct tpml_digest_values *digest_list)
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{
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struct tpm_chip_priv *priv;
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unsigned int updates, pcr_select_min;
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u32 rc;
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size_t i;
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priv = dev_get_uclass_priv(dev);
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if (!priv)
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return EFI_DEVICE_ERROR;
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pcr_select_min = priv->pcr_select_min;
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for (i = 0; i < digest_list->count; i++) {
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u16 hash_alg = digest_list->digests[i].hash_alg;
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u8 *digest = (u8 *)&digest_list->digests[i].digest;
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rc = tpm2_pcr_read(dev, pcr_index, pcr_select_min,
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hash_alg, digest, alg_to_len(hash_alg),
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&updates);
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if (rc) {
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EFI_PRINT("Failed to read PCR\n");
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return EFI_DEVICE_ERROR;
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}
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}
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return EFI_SUCCESS;
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}
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/* put_event - Append an agile event to an eventlog
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*
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* @pcr_index: PCR index
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* @event_type: type of event added
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* @digest_list: list of digest algorithms to add
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* @size: size of event
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* @event: event to add
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* @log: log buffer to append the event
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*
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*/
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static void put_event(u32 pcr_index, u32 event_type,
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struct tpml_digest_values *digest_list, u32 size,
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u8 event[], void *log)
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{
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size_t pos;
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size_t i;
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u32 event_size;
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/*
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* size refers to the length of event[] only, we need to check against
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* the final tcg_pcr_event2 size
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*/
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event_size = size + tcg_event_final_size(digest_list);
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put_unaligned_le32(pcr_index, log);
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pos = offsetof(struct tcg_pcr_event2, event_type);
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put_unaligned_le32(event_type, (void *)((uintptr_t)log + pos));
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pos = offsetof(struct tcg_pcr_event2, digests); /* count */
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put_unaligned_le32(digest_list->count, (void *)((uintptr_t)log + pos));
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pos += offsetof(struct tpml_digest_values, digests);
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for (i = 0; i < digest_list->count; i++) {
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u16 hash_alg = digest_list->digests[i].hash_alg;
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u8 *digest = (u8 *)&digest_list->digests[i].digest;
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put_unaligned_le16(hash_alg, (void *)((uintptr_t)log + pos));
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pos += offsetof(struct tpmt_ha, digest);
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memcpy((void *)((uintptr_t)log + pos), digest, alg_to_len(hash_alg));
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pos += alg_to_len(hash_alg);
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}
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put_unaligned_le32(size, (void *)((uintptr_t)log + pos));
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pos += sizeof(u32); /* tcg_pcr_event2 event_size*/
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memcpy((void *)((uintptr_t)log + pos), event, size);
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pos += size;
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/*
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* make sure the calculated buffer is what we checked against
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* This check should never fail. It checks the code above is
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* calculating the right length for the event we are adding
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*/
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if (pos != event_size)
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log_err("Appending to the EventLog failed\n");
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}
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/* tcg2_agile_log_append - Append an agile event to an eventlog
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*
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* @pcr_index: PCR index
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* @event_type: type of event added
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* @digest_list: list of digest algorithms to add
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* @size: size of event
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* @event: event to add
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* @log: log buffer to append the event
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*
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* @Return: status code
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*/
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static efi_status_t tcg2_agile_log_append(u32 pcr_index, u32 event_type,
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struct tpml_digest_values *digest_list,
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u32 size, u8 event[])
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{
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void *log = (void *)((uintptr_t)event_log.buffer + event_log.pos);
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u32 event_size = size + tcg_event_final_size(digest_list);
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struct efi_tcg2_final_events_table *final_event;
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efi_status_t ret = EFI_SUCCESS;
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/* if ExitBootServices hasn't been called update the normal log */
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if (!event_log.ebs_called) {
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if (event_log.truncated ||
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event_log.pos + event_size > TPM2_EVENT_LOG_SIZE) {
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event_log.truncated = true;
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return EFI_VOLUME_FULL;
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}
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put_event(pcr_index, event_type, digest_list, size, event, log);
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event_log.pos += event_size;
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event_log.last_event_size = event_size;
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}
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if (!event_log.get_event_called)
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return ret;
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/* if GetEventLog has been called update FinalEventLog as well */
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if (event_log.final_pos + event_size > TPM2_EVENT_LOG_SIZE)
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return EFI_VOLUME_FULL;
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log = (void *)((uintptr_t)event_log.final_buffer + event_log.final_pos);
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put_event(pcr_index, event_type, digest_list, size, event, log);
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final_event = event_log.final_buffer;
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final_event->number_of_events++;
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event_log.final_pos += event_size;
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return ret;
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}
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/**
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* platform_get_tpm_device() - retrieve TPM device
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*
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* This function retrieves the udevice implementing a TPM
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*
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* This function may be overridden if special initialization is needed.
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*
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* @dev: udevice
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* Return: status code
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*/
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__weak efi_status_t platform_get_tpm2_device(struct udevice **dev)
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{
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for_each_tpm_device(*dev) {
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/* Only support TPMv2 devices */
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if (tpm_get_version(*dev) == TPM_V2)
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return EFI_SUCCESS;
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}
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return EFI_NOT_FOUND;
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}
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/**
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* platform_get_eventlog() - retrieve the eventlog address and size
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*
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* This function retrieves the eventlog address and size if the underlying
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* firmware has done some measurements and passed them.
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*
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* This function may be overridden based on platform specific method of
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* passing the eventlog address and size.
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*
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* @dev: udevice
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* @addr: eventlog address
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* @sz: eventlog size
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* Return: status code
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*/
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__weak efi_status_t platform_get_eventlog(struct udevice *dev, u64 *addr,
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u32 *sz)
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{
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const u64 *basep;
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const u32 *sizep;
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basep = dev_read_prop(dev, "tpm_event_log_addr", NULL);
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if (!basep)
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return EFI_NOT_FOUND;
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*addr = be64_to_cpup((__force __be64 *)basep);
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sizep = dev_read_prop(dev, "tpm_event_log_size", NULL);
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if (!sizep)
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return EFI_NOT_FOUND;
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*sz = be32_to_cpup((__force __be32 *)sizep);
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if (*sz == 0) {
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log_debug("event log empty\n");
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return EFI_NOT_FOUND;
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}
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return EFI_SUCCESS;
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}
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/**
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* tpm2_get_max_command_size() - get the supported max command size
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*
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* @dev: TPM device
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* @max_command_size: output buffer for the size
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*
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* Return: 0 on success, -1 on error
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*/
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static int tpm2_get_max_command_size(struct udevice *dev, u16 *max_command_size)
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{
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u8 response[TPM2_RESPONSE_BUFFER_SIZE];
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u32 ret;
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memset(response, 0, sizeof(response));
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ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
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TPM2_PT_MAX_COMMAND_SIZE, response, 1);
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if (ret)
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return -1;
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*max_command_size = (uint16_t)get_unaligned_be32(response +
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properties_offset);
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return 0;
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}
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/**
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* tpm2_get_max_response_size() - get the supported max response size
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*
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* @dev: TPM device
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* @max_response_size: output buffer for the size
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*
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* Return: 0 on success, -1 on error
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*/
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static int tpm2_get_max_response_size(struct udevice *dev,
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u16 *max_response_size)
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{
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u8 response[TPM2_RESPONSE_BUFFER_SIZE];
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u32 ret;
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memset(response, 0, sizeof(response));
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ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
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TPM2_PT_MAX_RESPONSE_SIZE, response, 1);
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if (ret)
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return -1;
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*max_response_size = (uint16_t)get_unaligned_be32(response +
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properties_offset);
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return 0;
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}
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/**
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* tpm2_get_manufacturer_id() - get the manufacturer ID
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*
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* @dev: TPM device
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* @manufacturer_id: output buffer for the id
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*
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* Return: 0 on success, -1 on error
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*/
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static int tpm2_get_manufacturer_id(struct udevice *dev, u32 *manufacturer_id)
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{
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u8 response[TPM2_RESPONSE_BUFFER_SIZE];
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u32 ret;
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memset(response, 0, sizeof(response));
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ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
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TPM2_PT_MANUFACTURER, response, 1);
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if (ret)
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return -1;
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*manufacturer_id = get_unaligned_be32(response + properties_offset);
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return 0;
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}
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|
|
/**
|
|
* 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:
|
|
continue;
|
|
}
|
|
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:
|
|
continue;
|
|
}
|
|
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;
|
|
|
|
if (!is_tcg2_protocol_installed())
|
|
return EFI_SUCCESS;
|
|
|
|
ret = platform_get_tpm2_device(&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 = 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(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 = platform_get_tpm2_device(&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)
|
|
{
|
|
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,
|
|
};
|
|
|
|
/**
|
|
* parse_event_log_header() - Parse and verify the event log header fields
|
|
*
|
|
* @buffer: Pointer to the start of the eventlog
|
|
* @size: Size of the eventlog
|
|
* @pos: Return offset of the next event in buffer right
|
|
* after the event header i.e specID
|
|
*
|
|
* Return: status code
|
|
*/
|
|
static efi_status_t parse_event_log_header(void *buffer, u32 size, u32 *pos)
|
|
{
|
|
struct tcg_pcr_event *event_header = (struct tcg_pcr_event *)buffer;
|
|
int i = 0;
|
|
|
|
if (size < sizeof(*event_header))
|
|
return EFI_COMPROMISED_DATA;
|
|
|
|
if (get_unaligned_le32(&event_header->pcr_index) != 0 ||
|
|
get_unaligned_le32(&event_header->event_type) != EV_NO_ACTION)
|
|
return EFI_COMPROMISED_DATA;
|
|
|
|
for (i = 0; i < sizeof(event_header->digest); i++) {
|
|
if (event_header->digest[i])
|
|
return EFI_COMPROMISED_DATA;
|
|
}
|
|
|
|
*pos += sizeof(*event_header);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* parse_specid_event() - Parse and verify the specID Event in the eventlog
|
|
*
|
|
* @dev: udevice
|
|
* @buffer: Pointer to the start of the eventlog
|
|
* @log_size: Size of the eventlog
|
|
* @pos: [in] Offset of specID event in the eventlog buffer
|
|
* [out] Return offset of the next event in the buffer
|
|
* after the specID
|
|
* @digest_list: list of digests in the event
|
|
*
|
|
* Return: status code
|
|
* @pos Offset in the eventlog where the specID event ends
|
|
* @digest_list: list of digests in the event
|
|
*/
|
|
static efi_status_t parse_specid_event(struct udevice *dev, void *buffer,
|
|
u32 log_size, u32 *pos,
|
|
struct tpml_digest_values *digest_list)
|
|
{
|
|
struct tcg_efi_spec_id_event *spec_event;
|
|
struct tcg_pcr_event *event_header = (struct tcg_pcr_event *)buffer;
|
|
size_t spec_event_size;
|
|
u32 active = 0, supported = 0, pcr_count = 0, alg_count = 0;
|
|
u32 spec_active = 0;
|
|
u16 hash_alg;
|
|
u8 vendor_sz;
|
|
int err, i;
|
|
|
|
if (*pos >= log_size || (*pos + sizeof(*spec_event)) > log_size)
|
|
return EFI_COMPROMISED_DATA;
|
|
|
|
/* Check specID event data */
|
|
spec_event = (struct tcg_efi_spec_id_event *)((uintptr_t)buffer + *pos);
|
|
/* Check for signature */
|
|
if (memcmp(spec_event->signature, TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03,
|
|
sizeof(TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03))) {
|
|
log_err("specID Event: Signature mismatch\n");
|
|
return EFI_COMPROMISED_DATA;
|
|
}
|
|
|
|
if (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)
|
|
return EFI_COMPROMISED_DATA;
|
|
|
|
if (spec_event->number_of_algorithms > MAX_HASH_COUNT ||
|
|
spec_event->number_of_algorithms < 1) {
|
|
log_err("specID Event: Number of algorithms incorrect\n");
|
|
return EFI_COMPROMISED_DATA;
|
|
}
|
|
|
|
alg_count = spec_event->number_of_algorithms;
|
|
|
|
err = tpm2_get_pcr_info(dev, &supported, &active, &pcr_count);
|
|
if (err)
|
|
return EFI_DEVICE_ERROR;
|
|
|
|
digest_list->count = 0;
|
|
/*
|
|
* We have to take care that the sequence of algorithms that we record
|
|
* in digest_list matches the sequence in eventlog.
|
|
*/
|
|
for (i = 0; i < alg_count; i++) {
|
|
hash_alg =
|
|
get_unaligned_le16(&spec_event->digest_sizes[i].algorithm_id);
|
|
|
|
if (!(supported & alg_to_mask(hash_alg))) {
|
|
log_err("specID Event: Unsupported algorithm\n");
|
|
return EFI_COMPROMISED_DATA;
|
|
}
|
|
digest_list->digests[digest_list->count++].hash_alg = hash_alg;
|
|
|
|
spec_active |= alg_to_mask(hash_alg);
|
|
}
|
|
|
|
/*
|
|
* TCG specification expects the event log to have hashes for all
|
|
* active PCR's
|
|
*/
|
|
if (spec_active != active) {
|
|
/*
|
|
* Previous stage bootloader should know all the active PCR's
|
|
* and use them in the Eventlog.
|
|
*/
|
|
log_err("specID Event: All active hash alg not present\n");
|
|
return EFI_COMPROMISED_DATA;
|
|
}
|
|
|
|
/*
|
|
* 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) +
|
|
alg_count * sizeof(spec_event->digest_sizes[0]);
|
|
|
|
if (*pos + spec_event_size >= log_size)
|
|
return EFI_COMPROMISED_DATA;
|
|
|
|
vendor_sz = *(uint8_t *)((uintptr_t)buffer + *pos + spec_event_size);
|
|
|
|
spec_event_size += sizeof(vendor_sz) + vendor_sz;
|
|
*pos += spec_event_size;
|
|
|
|
if (get_unaligned_le32(&event_header->event_size) != spec_event_size) {
|
|
log_err("specID event: header event size mismatch\n");
|
|
/* Right way to handle this can be to call SetActive PCR's */
|
|
return EFI_COMPROMISED_DATA;
|
|
}
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* tcg2_parse_event() - Parse the event in the eventlog
|
|
*
|
|
* @dev: udevice
|
|
* @buffer: Pointer to the start of the eventlog
|
|
* @log_size: Size of the eventlog
|
|
* @offset: [in] Offset of the event in the eventlog buffer
|
|
* [out] Return offset of the next event in the buffer
|
|
* @digest_list: list of digests in the event
|
|
* @pcr Index of the PCR in the event
|
|
*
|
|
* Return: status code
|
|
*/
|
|
static efi_status_t tcg2_parse_event(struct udevice *dev, void *buffer,
|
|
u32 log_size, u32 *offset,
|
|
struct tpml_digest_values *digest_list,
|
|
u32 *pcr)
|
|
{
|
|
struct tcg_pcr_event2 *event = NULL;
|
|
u32 count, size, event_size;
|
|
size_t pos;
|
|
|
|
event_size = tcg_event_final_size(digest_list);
|
|
if (*offset >= log_size || *offset + event_size > log_size) {
|
|
log_err("Event exceeds log size\n");
|
|
return EFI_COMPROMISED_DATA;
|
|
}
|
|
|
|
event = (struct tcg_pcr_event2 *)((uintptr_t)buffer + *offset);
|
|
*pcr = get_unaligned_le32(&event->pcr_index);
|
|
|
|
/* get the count */
|
|
count = get_unaligned_le32(&event->digests.count);
|
|
if (count != digest_list->count)
|
|
return EFI_COMPROMISED_DATA;
|
|
|
|
pos = offsetof(struct tcg_pcr_event2, digests);
|
|
pos += offsetof(struct tpml_digest_values, digests);
|
|
|
|
for (int i = 0; i < digest_list->count; i++) {
|
|
u16 alg;
|
|
u16 hash_alg = digest_list->digests[i].hash_alg;
|
|
u8 *digest = (u8 *)&digest_list->digests[i].digest;
|
|
|
|
alg = get_unaligned_le16((void *)((uintptr_t)event + pos));
|
|
|
|
if (alg != hash_alg)
|
|
return EFI_COMPROMISED_DATA;
|
|
|
|
pos += offsetof(struct tpmt_ha, digest);
|
|
memcpy(digest, (void *)((uintptr_t)event + pos), alg_to_len(hash_alg));
|
|
pos += alg_to_len(hash_alg);
|
|
}
|
|
|
|
size = get_unaligned_le32((void *)((uintptr_t)event + pos));
|
|
event_size += size;
|
|
pos += sizeof(u32); /* tcg_pcr_event2 event_size*/
|
|
pos += size;
|
|
|
|
/* make sure the calculated buffer is what we checked against */
|
|
if (pos != event_size)
|
|
return EFI_COMPROMISED_DATA;
|
|
|
|
if (pos > log_size)
|
|
return EFI_COMPROMISED_DATA;
|
|
|
|
*offset += pos;
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* tcg2_get_fw_eventlog() - Get the eventlog address and size
|
|
*
|
|
* If the previous firmware has passed some eventlog, this function get it's
|
|
* location and check for it's validity.
|
|
*
|
|
* @dev: udevice
|
|
* @log_buffer: eventlog address
|
|
* @log_sz: eventlog size
|
|
*
|
|
* Return: status code
|
|
*/
|
|
static efi_status_t tcg2_get_fw_eventlog(struct udevice *dev, void *log_buffer,
|
|
size_t *log_sz)
|
|
{
|
|
struct tpml_digest_values digest_list;
|
|
void *buffer;
|
|
efi_status_t ret;
|
|
u32 pcr, pos;
|
|
u64 base;
|
|
u32 sz;
|
|
bool extend_pcr = false;
|
|
int i;
|
|
|
|
ret = platform_get_eventlog(dev, &base, &sz);
|
|
if (ret != EFI_SUCCESS)
|
|
return ret;
|
|
|
|
if (sz > TPM2_EVENT_LOG_SIZE)
|
|
return EFI_VOLUME_FULL;
|
|
|
|
buffer = (void *)(uintptr_t)base;
|
|
pos = 0;
|
|
/* Parse the eventlog to check for its validity */
|
|
ret = parse_event_log_header(buffer, sz, &pos);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = parse_specid_event(dev, buffer, sz, &pos, &digest_list);
|
|
if (ret) {
|
|
log_err("Error parsing SPEC ID Event\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = tcg2_pcr_read(dev, 0, &digest_list);
|
|
if (ret) {
|
|
log_err("Error reading PCR 0\n");
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* If PCR0 is 0, previous firmware didn't have the capability
|
|
* to extend the PCR. In this scenario, extend the PCR as
|
|
* the eventlog is parsed.
|
|
*/
|
|
for (i = 0; i < digest_list.count; i++) {
|
|
u8 hash_buf[TPM2_SHA512_DIGEST_SIZE] = { 0 };
|
|
u16 hash_alg = digest_list.digests[i].hash_alg;
|
|
|
|
if (!memcmp((u8 *)&digest_list.digests[i].digest, hash_buf,
|
|
alg_to_len(hash_alg)))
|
|
extend_pcr = true;
|
|
}
|
|
|
|
while (pos < sz) {
|
|
ret = tcg2_parse_event(dev, buffer, sz, &pos, &digest_list,
|
|
&pcr);
|
|
if (ret) {
|
|
log_err("Error parsing event\n");
|
|
return ret;
|
|
}
|
|
if (extend_pcr) {
|
|
ret = tcg2_pcr_extend(dev, pcr, &digest_list);
|
|
if (ret != EFI_SUCCESS) {
|
|
log_err("Error in extending PCR\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Clear the digest for next event */
|
|
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;
|
|
|
|
memset(digest, 0, alg_to_len(hash_alg));
|
|
}
|
|
}
|
|
}
|
|
|
|
memcpy(log_buffer, buffer, sz);
|
|
*log_sz = sz;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
efi_status_t ret;
|
|
|
|
ret = tcg2_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 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)
|
|
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_header = (struct tcg_pcr_event *)event_log.buffer;
|
|
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.
|
|
*/
|
|
ret = tcg2_get_fw_eventlog(dev, event_log.buffer, &event_log.pos);
|
|
/*
|
|
* If earlier firmware hasn't passed any eventlog, go ahead and
|
|
* create the eventlog header.
|
|
*/
|
|
if (ret == EFI_NOT_FOUND) {
|
|
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;
|
|
|
|
/*
|
|
* Add SCRTM version to the log if previous firmmware
|
|
* doesn't pass an eventlog.
|
|
*/
|
|
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 = 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[] = 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 smbios_entry *entry)
|
|
{
|
|
efi_status_t ret;
|
|
struct smbios_header *smbios_copy;
|
|
struct smbios_handoff_table_pointers2 *event = NULL;
|
|
u32 event_size;
|
|
|
|
/*
|
|
* 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->struct_table_length;
|
|
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, &smbios_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->struct_table_length);
|
|
|
|
smbios_prepare_measurement(entry, smbios_copy);
|
|
|
|
ret = tcg2_measure_event(dev, 1, EV_EFI_HANDOFF_TABLES2, event_size,
|
|
(u8 *)event);
|
|
if (ret != EFI_SUCCESS)
|
|
goto out;
|
|
|
|
out:
|
|
free(event);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* find_smbios_table() - find smbios table
|
|
*
|
|
* Return: pointer to the smbios table
|
|
*/
|
|
static void *find_smbios_table(void)
|
|
{
|
|
u32 i;
|
|
|
|
for (i = 0; i < systab.nr_tables; i++) {
|
|
if (!guidcmp(&smbios_guid, &systab.tables[i].guid))
|
|
return systab.tables[i].table;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* 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 = tcg2_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 = platform_get_tpm2_device(&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 = tcg2_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 smbios_entry *entry;
|
|
|
|
if (!is_tcg2_protocol_installed())
|
|
return EFI_SUCCESS;
|
|
|
|
if (tcg2_efi_app_invoked)
|
|
return EFI_SUCCESS;
|
|
|
|
ret = platform_get_tpm2_device(&dev);
|
|
if (ret != EFI_SUCCESS)
|
|
return EFI_SECURITY_VIOLATION;
|
|
|
|
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;
|
|
|
|
entry = (struct smbios_entry *)find_smbios_table();
|
|
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 = 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;
|
|
|
|
if (!is_tcg2_protocol_installed())
|
|
return EFI_SUCCESS;
|
|
|
|
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);
|
|
|
|
event_log.ebs_called = true;
|
|
|
|
if (!is_tcg2_protocol_installed()) {
|
|
ret = EFI_SUCCESS;
|
|
goto out;
|
|
}
|
|
|
|
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;
|
|
|
|
if (!is_tcg2_protocol_installed())
|
|
return EFI_SUCCESS;
|
|
|
|
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;
|
|
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 = platform_get_tpm2_device(&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 = platform_get_tpm2_device(&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;
|
|
}
|