// SPDX-License-Identifier: BSD-3-Clause
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/*
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* Copyright (c) 2020, ARM Limited. All rights reserved.
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*/
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#include <inttypes.h>
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#include <pta_system.h>
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#include <string.h>
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#include <ta_tpm_log.h>
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#include <tee_internal_api.h>
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#define LOG_SIZE 1024
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static TEE_Result invoke_system_pta(uint32_t cmd_id, uint32_t param_types,
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TEE_Param params[TEE_NUM_PARAMS])
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{
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const TEE_UUID system_uuid = PTA_SYSTEM_UUID;
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TEE_TASessionHandle session = TEE_HANDLE_NULL;
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TEE_Result res = TEE_ERROR_GENERIC;
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uint32_t ret_origin = 0;
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res = TEE_OpenTASession(&system_uuid, TEE_TIMEOUT_INFINITE,
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0, NULL, &session, &ret_origin);
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if (res != TEE_SUCCESS)
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return res;
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res = TEE_InvokeTACommand(session, TEE_TIMEOUT_INFINITE,
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cmd_id, param_types, params, &ret_origin);
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TEE_CloseTASession(session);
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return res;
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}
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/*
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* Test case for the use of right parameters.
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*/
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static TEE_Result test_with_right_parameters(void)
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{
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unsigned char buf[LOG_SIZE] = { 0 };
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const uint32_t param_types = TEE_PARAM_TYPES(
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TEE_PARAM_TYPE_MEMREF_OUTPUT,
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TEE_PARAM_TYPE_NONE,
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TEE_PARAM_TYPE_NONE,
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TEE_PARAM_TYPE_NONE);
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TEE_Param params[TEE_NUM_PARAMS] = { 0 };
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uint32_t field = 0;
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unsigned char *digestptr = NULL;
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unsigned int i = 0;
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params[0].memref.buffer = (void *)buf;
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params[0].memref.size = LOG_SIZE;
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if (invoke_system_pta(PTA_SYSTEM_GET_TPM_EVENT_LOG,
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param_types, params) == TEE_SUCCESS) {
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DMSG("Received %i bytes of event log", params[0].memref.size);
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DMSG("Parsing the event log header:");
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memcpy(&field, &buf[0], sizeof(uint32_t));
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DMSG("\tPCRIndex = 0x%" PRIx32, field);
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/*
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* PCR Index must be 0 on the header.
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* Ref. Section 5.3 of TCG EFI Protocol Specification.
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* Family 2.0 Level 00 Revision 00.13. March 30, 2016
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*/
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if (field != 0) {
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EMSG("PCRIndex must be 0");
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return TEE_ERROR_GENERIC;
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}
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memcpy(&field, &buf[4], sizeof(uint32_t));
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DMSG("\tEventType = 0x%" PRIx32, field);
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/*
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* Event type must be EV_NO_ACTION on the header.
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* Ref. Section 5.3 of TCG EFI Protocol Specification.
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* Family 2.0 Level 00 Revision 00.13. March 30, 2016
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*/
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if (field != 3) {
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EMSG("EventType must be 3 (EV_NO_ACTION)");
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return TEE_ERROR_GENERIC;
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}
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/*
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* Header digest must be formed of 20 bytes set to 0.
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* Ref. Section 5.3 of TCG EFI Protocol Specification.
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* Family 2.0 Level 00 Revision 00.12. March 30, 2016
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*/
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digestptr = &buf[8];
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for (i = 0; i < 20; i++) {
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if (*(digestptr + i) != 0) {
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EMSG("Digest byte %i must be 0", i);
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return TEE_ERROR_GENERIC;
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}
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}
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DMSG("--> Digest value passed");
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return TEE_SUCCESS;
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}
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return TEE_ERROR_ACCESS_DENIED;
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}
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/*
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* Test case for short buffer.
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*/
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static TEE_Result test_short_buffer(void)
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{
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unsigned char buf[LOG_SIZE] = { 0 };
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const uint32_t param_types = TEE_PARAM_TYPES(
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TEE_PARAM_TYPE_MEMREF_OUTPUT,
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TEE_PARAM_TYPE_NONE,
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TEE_PARAM_TYPE_NONE,
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TEE_PARAM_TYPE_NONE);
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TEE_Param params[TEE_NUM_PARAMS] = { 0 };
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unsigned int i = 0;
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params[0].memref.buffer = (void *)buf;
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params[0].memref.size = 1;
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if (invoke_system_pta(PTA_SYSTEM_GET_TPM_EVENT_LOG, param_types,
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params) != TEE_ERROR_SHORT_BUFFER) {
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return TEE_ERROR_GENERIC;
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}
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for (i = 0; i < LOG_SIZE; i++) {
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if (buf[i] != 0) {
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EMSG("Buf is expected to be all zeroed");
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return TEE_ERROR_GENERIC;
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}
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}
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return TEE_SUCCESS;
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}
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/*
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* Trusted Application Entry Points
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*/
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/* Called each time a new instance is created */
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TEE_Result TA_CreateEntryPoint(void)
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{
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return TEE_SUCCESS;
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}
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/* Called each time an instance is destroyed */
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void TA_DestroyEntryPoint(void)
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{
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}
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/* Called each time a session is opened */
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TEE_Result TA_OpenSessionEntryPoint(uint32_t nParamTypes __unused,
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TEE_Param pParams[4] __unused,
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void **ppSessionContext __unused)
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{
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return TEE_SUCCESS;
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}
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/* Called each time a session is closed */
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void TA_CloseSessionEntryPoint(void *pSessionContext __unused)
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{
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}
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/* Called when a command is invoked */
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TEE_Result TA_InvokeCommandEntryPoint(void *pSessionContext __unused,
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uint32_t nCommandID,
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uint32_t nParamTypes __unused,
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TEE_Param pParams[4] __unused)
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{
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switch (nCommandID) {
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case TA_TPM_TEST_GET_LOG:
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return test_with_right_parameters();
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case TA_TPM_TEST_SHORT_BUF:
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return test_short_buffer();
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default:
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return TEE_ERROR_BAD_PARAMETERS;
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}
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}
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