| /* SPDX-License-Identifier: BSD-2-Clause */ |
| /******************************************************************************* |
| * Copyright 2018-2019, Fraunhofer SIT sponsored by Infineon Technologies AG |
| * All rights reserved. |
| ******************************************************************************/ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #include "tss2_mu.h" |
| #include "tss2_fapi.h" |
| #include "fapi_int.h" |
| #include "fapi_util.h" |
| #include "tss2_esys.h" |
| #include "fapi_policy.h" |
| #include "fapi_crypto.h" |
| #define LOGMODULE fapi |
| #include "util/log.h" |
| #include "util/aux_util.h" |
| |
| /** One-Call function for Fapi_WriteAuthorizeNv |
| * |
| * Write the policyDigest of a policy to an NV index so it can be used in policies |
| * containing PolicyAuthorizeNV elements. |
| * |
| * @param[in,out] context The FAPI_CONTEXT |
| * @param[in] nvPath The path of the NV index |
| * @param[in] policyPath The path of the new policy |
| * |
| * @retval TSS2_RC_SUCCESS: if the function call was a success. |
| * @retval TSS2_FAPI_RC_BAD_REFERENCE: if context or path is NULL. |
| * @retval TSS2_FAPI_RC_BAD_CONTEXT: if context corruption is detected. |
| * @retval TSS2_FAPI_RC_BAD_PATH: if nvPath or policyPath does not map to a |
| * FAPI policy or NV index. |
| * @retval TSS2_FAPI_RC_BAD_SEQUENCE: if the context has an asynchronous |
| * operation already pending. |
| * @retval TSS2_FAPI_RC_IO_ERROR: if the data cannot be saved. |
| * @retval TSS2_FAPI_RC_MEMORY: if the FAPI cannot allocate enough memory for |
| * internal operations or return parameters. |
| * @retval TSS2_FAPI_RC_NO_TPM if FAPI was initialized in no-TPM-mode via its |
| * config file. |
| * @retval TSS2_FAPI_RC_PATH_NOT_FOUND if a FAPI object path was not found |
| * during authorization. |
| * @retval TSS2_FAPI_RC_KEY_NOT_FOUND if a key was not found. |
| * @retval TSS2_FAPI_RC_BAD_VALUE if an invalid value was passed into |
| * the function. |
| * @retval TSS2_FAPI_RC_TRY_AGAIN if an I/O operation is not finished yet and |
| * this function needs to be called again. |
| * @retval TSS2_FAPI_RC_GENERAL_FAILURE if an internal error occurred. |
| * @retval TSS2_ESYS_RC_* possible error codes of ESAPI. |
| * @retval TSS2_FAPI_RC_NOT_PROVISIONED FAPI was not provisioned. |
| * @retval TSS2_FAPI_RC_AUTHORIZATION_UNKNOWN if a required authorization callback |
| * is not set. |
| * @retval TSS2_FAPI_RC_AUTHORIZATION_FAILED if the authorization attempt fails. |
| * @retval TSS2_FAPI_RC_POLICY_UNKNOWN if policy search for a certain policy digest |
| * was not successful. |
| */ |
| TSS2_RC |
| Fapi_WriteAuthorizeNv( |
| FAPI_CONTEXT *context, |
| char const *nvPath, |
| char const *policyPath) |
| { |
| LOG_TRACE("called for context:%p", context); |
| |
| TSS2_RC r, r2; |
| |
| /* Check for NULL parameters */ |
| check_not_null(context); |
| check_not_null(nvPath); |
| check_not_null(policyPath); |
| |
| /* Check whether TCTI and ESYS are initialized */ |
| return_if_null(context->esys, "Command can't be executed in none TPM mode.", |
| TSS2_FAPI_RC_NO_TPM); |
| |
| /* If the async state automata of FAPI shall be tested, then we must not set |
| the timeouts of ESYS to blocking mode. |
| During testing, the mssim tcti will ensure multiple re-invocations. |
| Usually however the synchronous invocations of FAPI shall instruct ESYS |
| to block until a result is available. */ |
| #ifndef TEST_FAPI_ASYNC |
| r = Esys_SetTimeout(context->esys, TSS2_TCTI_TIMEOUT_BLOCK); |
| return_if_error_reset_state(r, "Set Timeout to blocking"); |
| #endif /* TEST_FAPI_ASYNC */ |
| |
| r = Fapi_WriteAuthorizeNv_Async(context, nvPath, policyPath); |
| return_if_error_reset_state(r, "WriteAuthorizeNV"); |
| |
| do { |
| /* We wait for file I/O to be ready if the FAPI state automata |
| are in a file I/O state. */ |
| r = ifapi_io_poll(&context->io); |
| return_if_error(r, "Something went wrong with IO polling"); |
| |
| /* Repeatedly call the finish function, until FAPI has transitioned |
| through all execution stages / states of this invocation. */ |
| r = Fapi_WriteAuthorizeNv_Finish(context); |
| } while (base_rc(r) == TSS2_BASE_RC_TRY_AGAIN); |
| |
| /* Reset the ESYS timeout to non-blocking, immediate response. */ |
| r2 = Esys_SetTimeout(context->esys, 0); |
| return_if_error(r2, "Set Timeout to non-blocking"); |
| |
| return_if_error_reset_state(r, "WriteAuthorizeNV"); |
| |
| LOG_TRACE("finished"); |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Asynchronous function for Fapi_WriteAuthorizeNv |
| * |
| * Write the policyDigest of a policy to an NV index so it can be used in policies |
| * containing PolicyAuthorizeNV elements. |
| * |
| * Call Fapi_WriteAuthorizeNv_Finish to finish the execution of this command. |
| * |
| * @param[in,out] context The FAPI_CONTEXT |
| * @param[in] nvPath The path of the NV index |
| * @param[in] policyPath The path of the new policy |
| * |
| * @retval TSS2_RC_SUCCESS: if the function call was a success. |
| * @retval TSS2_FAPI_RC_BAD_REFERENCE: if context or path is NULL. |
| * @retval TSS2_FAPI_RC_BAD_CONTEXT: if context corruption is detected. |
| * @retval TSS2_FAPI_RC_BAD_PATH: if nvPath or policyPath does not map to a |
| * FAPI policy or NV index. |
| * @retval TSS2_FAPI_RC_BAD_SEQUENCE: if the context has an asynchronous |
| * operation already pending. |
| * @retval TSS2_FAPI_RC_IO_ERROR: if the data cannot be saved. |
| * @retval TSS2_FAPI_RC_MEMORY: if the FAPI cannot allocate enough memory for |
| * internal operations or return parameters. |
| * @retval TSS2_FAPI_RC_NO_TPM if FAPI was initialized in no-TPM-mode via its |
| * config file. |
| * @retval TSS2_FAPI_RC_PATH_NOT_FOUND if a FAPI object path was not found |
| * during authorization. |
| * @retval TSS2_FAPI_RC_KEY_NOT_FOUND if a key was not found. |
| * @retval TSS2_FAPI_RC_BAD_VALUE if an invalid value was passed into |
| * the function. |
| * @retval TSS2_FAPI_RC_NOT_PROVISIONED FAPI was not provisioned. |
| */ |
| TSS2_RC |
| Fapi_WriteAuthorizeNv_Async( |
| FAPI_CONTEXT *context, |
| char const *nvPath, |
| char const *policyPath) |
| { |
| LOG_TRACE("called for context:%p", context); |
| LOG_TRACE("nvPath: %s", nvPath); |
| LOG_TRACE("policyPath: %s", policyPath); |
| |
| TSS2_RC r; |
| |
| /* Check for NULL parameters */ |
| check_not_null(context); |
| check_not_null(nvPath); |
| check_not_null(policyPath); |
| |
| /* Helpful alias pointers */ |
| IFAPI_api_WriteAuthorizeNv * command = &context->cmd.WriteAuthorizeNV; |
| IFAPI_NV_Cmds * nvCmd = &context->nv_cmd; |
| |
| /* Reset all context-internal session state information. */ |
| r = ifapi_session_init(context); |
| return_if_error(r, "Initialize WriterAuthorizeNv"); |
| |
| /* Copy parameters to context for use during _Finish. */ |
| strdup_check(command->policyPath, policyPath, r, error_cleanup); |
| strdup_check(nvCmd->nvPath, nvPath, r, error_cleanup); |
| |
| /* Load the metadata for the NV index to be written to from the keystore. */ |
| r = ifapi_keystore_load_async(&context->keystore, &context->io, nvCmd->nvPath); |
| goto_if_error2(r, "Could not open: %s", error_cleanup, nvCmd->nvPath); |
| |
| /* Initialize the context state for this operation. */ |
| context->state = WRITE_AUTHORIZE_NV_READ_NV; |
| LOG_TRACE("finished"); |
| return TSS2_RC_SUCCESS; |
| |
| error_cleanup: |
| /* Cleanup duplicated input parameters that were copied before. */ |
| SAFE_FREE(command->policyPath); |
| SAFE_FREE(nvCmd->nvPath); |
| return r; |
| } |
| |
| /** Asynchronous finish function for Fapi_WriteAuthorizeNv |
| * |
| * This function should be called after a previous Fapi_WriteAuthorizeNv_Async. |
| * |
| * @param[in,out] context The FAPI_CONTEXT |
| * |
| * @retval TSS2_RC_SUCCESS: if the function call was a success. |
| * @retval TSS2_FAPI_RC_BAD_REFERENCE: if context is NULL. |
| * @retval TSS2_FAPI_RC_BAD_CONTEXT: if context corruption is detected. |
| * @retval TSS2_FAPI_RC_BAD_SEQUENCE: if the context has an asynchronous |
| * operation already pending. |
| * @retval TSS2_FAPI_RC_IO_ERROR: if the data cannot be saved. |
| * @retval TSS2_FAPI_RC_MEMORY: if the FAPI cannot allocate enough memory for |
| * internal operations or return parameters. |
| * @retval TSS2_FAPI_RC_TRY_AGAIN: if the asynchronous operation is not yet |
| * complete. Call this function again later. |
| * @retval TSS2_FAPI_RC_BAD_VALUE if an invalid value was passed into |
| * the function. |
| * @retval TSS2_FAPI_RC_GENERAL_FAILURE if an internal error occurred. |
| * @retval TSS2_FAPI_RC_PATH_NOT_FOUND if a FAPI object path was not found |
| * during authorization. |
| * @retval TSS2_FAPI_RC_KEY_NOT_FOUND if a key was not found. |
| * @retval TSS2_ESYS_RC_* possible error codes of ESAPI. |
| * @retval TSS2_FAPI_RC_BAD_PATH if the path is used in inappropriate context |
| * or contains illegal characters. |
| * @retval TSS2_FAPI_RC_NOT_PROVISIONED FAPI was not provisioned. |
| * @retval TSS2_FAPI_RC_AUTHORIZATION_UNKNOWN if a required authorization callback |
| * is not set. |
| * @retval TSS2_FAPI_RC_AUTHORIZATION_FAILED if the authorization attempt fails. |
| * @retval TSS2_FAPI_RC_POLICY_UNKNOWN if policy search for a certain policy digest |
| * was not successful. |
| */ |
| TSS2_RC |
| Fapi_WriteAuthorizeNv_Finish( |
| FAPI_CONTEXT *context) |
| { |
| LOG_TRACE("called for context:%p", context); |
| |
| TSS2_RC r; |
| const size_t maxNvSize = sizeof(TPMU_HA) + sizeof(TPMI_ALG_HASH); |
| BYTE nvBuffer[maxNvSize]; |
| size_t offset = 0; |
| |
| /* Check for NULL parameters */ |
| check_not_null(context); |
| |
| /* Helpful alias pointers */ |
| IFAPI_api_WriteAuthorizeNv * command = &context->cmd.WriteAuthorizeNV; |
| IFAPI_NV_Cmds * nvCmd = &context->nv_cmd; |
| IFAPI_OBJECT *object = &nvCmd->nv_object; |
| TPMI_ALG_HASH hashAlg; |
| TPMS_POLICY * policy = &context->policy.policy; |
| |
| switch (context->state) { |
| statecase(context->state, WRITE_AUTHORIZE_NV_READ_NV) |
| /* First check whether the file in object store can be updated. */ |
| r = ifapi_keystore_check_writeable(&context->keystore, &context->io, |
| nvCmd->nvPath); |
| goto_if_error_reset_state(r, |
| "Check whether update object store is possible.", error_cleanup); |
| |
| r = ifapi_keystore_load_finish(&context->keystore, &context->io, object); |
| return_try_again(r); |
| return_if_error_reset_state(r, "read_finish failed"); |
| |
| ifapi_cleanup_ifapi_object(object); |
| |
| /* Initialize the NV index object to be used with esys. */ |
| r = ifapi_initialize_object(context->esys, object); |
| goto_if_error_reset_state(r, "Initialize NV object", error_cleanup); |
| |
| fallthrough; |
| |
| statecase(context->state, WRITE_AUTHORIZE_NV_CALCULATE_POLICY) |
| /* Calculate the policy digest for the referenced policy. */ |
| hashAlg = object->misc.nv.public.nvPublic.nameAlg; |
| r = ifapi_calculate_tree(context, command->policyPath, |
| policy, hashAlg, &command->digest_idx, |
| &command->hash_size); |
| if (r != TSS2_RC_SUCCESS) { |
| ifapi_cleanup_ifapi_object(object); |
| } |
| return_try_again(r); |
| goto_if_error(r, "Fapi calculate tree.", error_cleanup); |
| |
| fallthrough; |
| |
| statecase(context->state, WRITE_AUTHORIZE_NV_WRITE_NV_RAM_PREPARE) |
| |
| /* Copy hash alg followed by digest into a buffer to be written to NV ram */ |
| r = Tss2_MU_TPMI_ALG_HASH_Marshal( |
| object->misc.nv.public.nvPublic.nameAlg, |
| &nvBuffer[0], maxNvSize, &offset); |
| goto_if_error_reset_state(r, "FAPI marshal hash alg", error_cleanup); |
| |
| void * currentDigest = |
| &policy->policyDigests.digests[command->digest_idx].digest; |
| memcpy(&nvBuffer[offset], currentDigest, command->hash_size); |
| |
| /* Store these data in the context to be used for re-entry on nv_write. */ |
| nvCmd->data = &nvBuffer[0]; |
| nvCmd->numBytes = command->hash_size + sizeof(TPMI_ALG_HASH); |
| fallthrough; |
| |
| statecase(context->state, WRITE_AUTHORIZE_NV_WRITE_NV_RAM) |
| /* Perform the actual NV Write operation. */ |
| r = ifapi_nv_write(context, nvCmd->nvPath, 0, |
| nvCmd->data, context->nv_cmd.numBytes); |
| return_try_again(r); |
| goto_if_error_reset_state(r, " FAPI NV Write", error_cleanup); |
| |
| /* Perform esys serialization if necessary */ |
| r = ifapi_esys_serialize_object(context->esys, object); |
| goto_if_error(r, "Prepare serialization", error_cleanup); |
| |
| /* Save NV object to ensure that changed flags are updated. */ |
| r = ifapi_keystore_store_async(&context->keystore, &context->io, |
| nvCmd->nvPath, object); |
| goto_if_error_reset_state(r, "Could not open: %sh", error_cleanup, |
| nvCmd->nvPath); |
| |
| fallthrough; |
| |
| statecase(context->state, WRITE_AUTHORIZE_NV_WRITE_OBJCECT) |
| /* Finish writing the NV object to the key store */ |
| r = ifapi_keystore_store_finish(&context->keystore, &context->io); |
| return_try_again(r); |
| return_if_error_reset_state(r, "write_finish failed"); |
| |
| fallthrough; |
| |
| statecase(context->state, WRITE_AUTHORIZE_NV_WRITE_POLICY_PREPARE) |
| r = ifapi_policy_store_store_async(&context->pstore, &context->io, |
| command->policyPath, policy); |
| goto_if_error_reset_state(r, "Could not open: %s", error_cleanup, |
| command->policyPath); |
| fallthrough; |
| |
| statecase(context->state, WRITE_AUTHORIZE_NV_WRITE_POLICY) |
| /* Save policy with computed digest */ |
| r = ifapi_policy_store_store_finish(&context->pstore, &context->io); |
| return_try_again(r); |
| return_if_error_reset_state(r, "write_finish failed"); |
| |
| fallthrough; |
| |
| statecase(context->state, WRITE_AUTHORIZE_NV_CLEANUP) |
| /* Cleanup the session used for authorizing access to the NV index. */ |
| r = ifapi_cleanup_session(context); |
| try_again_or_error_goto(r, "Cleanup", error_cleanup); |
| context->state = _FAPI_STATE_INIT; |
| break; |
| |
| statecasedefault(context->state); |
| } |
| |
| error_cleanup: |
| /* Cleanup any intermediate results and state stored in the context. */ |
| SAFE_FREE(command->policyPath); |
| SAFE_FREE(nvCmd->nvPath); |
| ifapi_session_clean(context); |
| ifapi_cleanup_policy(policy); |
| ifapi_cleanup_ifapi_object(&context->loadKey.auth_object); |
| ifapi_cleanup_ifapi_object(context->loadKey.key_object); |
| ifapi_cleanup_ifapi_object(&context->createPrimary.pkey_object); |
| ifapi_cleanup_ifapi_object(object); |
| LOG_TRACE("finished"); |
| return r; |
| } |