| /* 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 <stdlib.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <string.h> |
| |
| #include "tss2_fapi.h" |
| #include "fapi_int.h" |
| #include "fapi_util.h" |
| #include "tss2_esys.h" |
| #include "fapi_crypto.h" |
| #include "fapi_policy.h" |
| #include "ifapi_policyutil_execute.h" |
| #include "ifapi_json_deserialize.h" |
| #define LOGMODULE fapi |
| #include "util/log.h" |
| #include "util/aux_util.h" |
| |
| /** One-Call function for Fapi_Decrypt |
| * |
| * Decrypts data that was previously encrypted with Fapi_Encrypt. |
| * |
| * @param[in,out] context The FAPI_CONTEXT |
| * @param[in] keyPath The decryption key. |
| * @param[in] cipherText The ciphertext to decrypt. |
| * @param[in] cipherTextSize The size of the ciphertext to decrypt. |
| * @param[out] plainText the decrypted ciphertext. May be NULL |
| * (callee-allocated) |
| * @param[out] plainTextSize The size of the ciphertext in bytes. May be NULL |
| * |
| * @retval TSS2_RC_SUCCESS: if the function call was a success. |
| * @retval TSS2_FAPI_RC_BAD_REFERENCE: if context or cipherText is NULL. |
| * @retval TSS2_FAPI_RC_BAD_CONTEXT: if context corruption is detected. |
| * @retval TSS2_FAPI_RC_KEY_NOT_FOUND: if can’t find the key necessary to decrypt |
| * the file. |
| * @retval TSS2_FAPI_RC_BAD_KEY: if the decryption key is unsuitable for the |
| * requested operation. |
| * @retval TSS2_FAPI_RC_BAD_VALUE: if the decryption fails |
| * @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_GENERAL_FAILURE if an internal error occurred. |
| * @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_PATH_NOT_FOUND if a FAPI object path was not found |
| * during authorization. |
| * @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. |
| * @retval TSS2_ESYS_RC_* possible error codes of ESAPI. |
| * @retval TSS2_FAPI_RC_NOT_PROVISIONED FAPI was not provisioned. |
| * @retval TSS2_FAPI_RC_BAD_PATH if the path is used in inappropriate context |
| * or contains illegal characters. |
| */ |
| TSS2_RC |
| Fapi_Decrypt( |
| FAPI_CONTEXT *context, |
| char const *keyPath, |
| uint8_t const *cipherText, |
| size_t cipherTextSize, |
| uint8_t **plainText, |
| size_t *plainTextSize) |
| { |
| LOG_TRACE("called for context:%p", context); |
| |
| TSS2_RC r, r2; |
| |
| /* Check for NULL parameters */ |
| check_not_null(context); |
| check_not_null(keyPath); |
| check_not_null(cipherText); |
| |
| /* 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_Decrypt_Async(context, keyPath, cipherText, cipherTextSize); |
| return_if_error_reset_state(r, "Data_Encrypt"); |
| |
| 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_Decrypt_Finish(context, plainText, plainTextSize); |
| } 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, "Data_Decrypt"); |
| |
| LOG_TRACE("finished"); |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Asynchronous function for Fapi_Decrypt |
| * |
| * Decrypts data that was previously encrypted with Fapi_Encrypt. |
| * |
| * Call Fapi_Decrypt_Finish to finish the execution of this command. |
| * |
| * @param[in,out] context The FAPI_CONTEXT |
| * @param[in] keyPath The decryption key. |
| * @param[in] cipherText The ciphertext to decrypt |
| * @param[in] cipherTextSize The size of the ciphertext to decrypt |
| * |
| * @retval TSS2_RC_SUCCESS: if the function call was a success. |
| * @retval TSS2_FAPI_RC_BAD_REFERENCE: if context or cipherText is NULL. |
| * @retval TSS2_FAPI_RC_BAD_CONTEXT: if context corruption is detected. |
| * @retval TSS2_FAPI_RC_KEY_NOT_FOUND: if can’t find the key necessary to decrypt |
| * the file. |
| * @retval TSS2_FAPI_RC_BAD_KEY: if the decryption key is unsuitable for the |
| * requested operation. |
| * @retval TSS2_FAPI_RC_BAD_VALUE: if the decryption fails |
| * @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. |
| */ |
| TSS2_RC |
| Fapi_Decrypt_Async( |
| FAPI_CONTEXT *context, |
| char const *keyPath, |
| uint8_t const *cipherText, |
| size_t cipherTextSize) |
| { |
| LOG_TRACE("called for context:%p", context); |
| LOG_TRACE("cipherText: %s", cipherText); |
| |
| TSS2_RC r; |
| |
| /* Check for NULL parameters */ |
| check_not_null(context); |
| check_not_null(keyPath); |
| check_not_null(cipherText); |
| |
| /* Helpful alias pointers */ |
| IFAPI_Data_EncryptDecrypt * command = &(context->cmd.Data_EncryptDecrypt); |
| |
| /* Reset all context-internal session state information. */ |
| r = ifapi_session_init(context); |
| return_if_error(r, "Initialize Decrypt"); |
| |
| command->object_handle = ESYS_TR_NONE; |
| command->plainText = NULL; |
| |
| goto_if_error(r, "Invalid cipher object.", error_cleanup); |
| |
| /* Copy parameters to context for use during _Finish. */ |
| uint8_t *inData = malloc(cipherTextSize); |
| goto_if_null(inData, "Out of memory", r, error_cleanup); |
| memcpy(inData, cipherText, cipherTextSize); |
| command->in_data = inData; |
| command->numBytes = cipherTextSize; |
| strdup_check(command->keyPath, keyPath, r, error_cleanup); |
| |
| /* Initialize the context state for this operation. */ |
| context->state = DATA_DECRYPT_WAIT_FOR_PROFILE; |
| |
| LOG_TRACE("finished"); |
| return r; |
| |
| error_cleanup: |
| SAFE_FREE(command->in_data); |
| SAFE_FREE(command->keyPath); |
| return r; |
| } |
| |
| /** Asynchronous finish function for Fapi_Decrypt |
| * |
| * This function should be called after a previous Fapi_Decrypt. |
| * |
| * @param[in,out] context The FAPI_CONTEXT |
| * @param[out] plainText the decrypted ciphertext. May be NULL |
| * (callee-allocated) |
| * @param[out] plainTextSize The size of the ciphertext in bytes. May be NULL |
| * |
| * @retval TSS2_RC_SUCCESS: if the function call was a success. |
| * @retval TSS2_FAPI_RC_BAD_REFERENCE: if context, plainText or plainTextSize |
| * 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_GENERAL_FAILURE if an internal error occurred. |
| * @retval TSS2_FAPI_RC_BAD_VALUE if an invalid value was passed into |
| * the function. |
| * @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_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. |
| * @retval TSS2_ESYS_RC_* possible error codes of ESAPI. |
| * @retval TSS2_FAPI_RC_NOT_PROVISIONED FAPI was not provisioned. |
| * @retval TSS2_FAPI_RC_BAD_PATH if the path is used in inappropriate context |
| * or contains illegal characters. |
| */ |
| TSS2_RC |
| Fapi_Decrypt_Finish( |
| FAPI_CONTEXT *context, |
| uint8_t **plainText, |
| size_t *plainTextSize) |
| { |
| LOG_TRACE("called for context:%p", context); |
| |
| TSS2_RC r; |
| TPM2B_PUBLIC_KEY_RSA *tpmPlainText = NULL; |
| |
| /* Check for NULL parameters */ |
| check_not_null(context); |
| |
| /* Helpful alias pointers */ |
| IFAPI_OBJECT *encKeyObject = NULL; |
| IFAPI_Data_EncryptDecrypt * command = &(context->cmd.Data_EncryptDecrypt); |
| |
| switch (context->state) { |
| statecase(context->state, DATA_DECRYPT_WAIT_FOR_PROFILE); |
| /* Retrieve the profile for the provided key in order to get the |
| encryption scheme below. */ |
| r = ifapi_profiles_get(&context->profiles, command->keyPath, |
| &command->profile); |
| return_try_again(r); |
| goto_if_error_reset_state(r, " FAPI create session", error_cleanup); |
| |
| /* Initialize a session used for authorization and parameter encryption. */ |
| r = ifapi_get_sessions_async(context, |
| IFAPI_SESSION_GENEK | IFAPI_SESSION1, |
| TPMA_SESSION_ENCRYPT | TPMA_SESSION_DECRYPT, 0); |
| goto_if_error_reset_state(r, "Create sessions", error_cleanup); |
| |
| fallthrough; |
| |
| statecase(context->state, DATA_DECRYPT_WAIT_FOR_SESSION); |
| r = ifapi_get_sessions_finish(context, &context->profiles.default_profile, |
| context->profiles.default_profile.nameAlg); |
| return_try_again(r); |
| goto_if_error_reset_state(r, " FAPI create session", error_cleanup); |
| |
| /* Load the key used for decryption. */ |
| r = ifapi_load_keys_async(context, command->keyPath); |
| return_try_again(r); |
| goto_if_error(r, "Load keys.", error_cleanup); |
| |
| fallthrough; |
| |
| statecase(context->state, DATA_DECRYPT_WAIT_FOR_KEY); |
| r = ifapi_load_keys_finish(context, IFAPI_FLUSH_PARENT, |
| &command->key_handle, |
| &command->key_object); |
| return_try_again(r); |
| goto_if_error_reset_state(r, " Load key.", error_cleanup); |
| |
| encKeyObject = command->key_object; |
| |
| if (encKeyObject->misc.key.public.publicArea.type != TPM2_ALG_RSA && |
| encKeyObject->misc.key.public.publicArea.type != TPM2_ALG_ECC) { |
| goto_error(r, TSS2_FAPI_RC_GENERAL_FAILURE, "Invalid algorithm", error_cleanup); |
| } |
| fallthrough; |
| |
| statecase(context->state, DATA_DECRYPT_AUTHORIZE_KEY); |
| /* Authorize for the key with password or policy. */ |
| r = ifapi_authorize_object(context, command->key_object, &command->auth_session); |
| return_try_again(r); |
| goto_if_error(r, "Authorize key.", error_cleanup); |
| TPM2B_DATA null_data = {.size = 0, .buffer = {} }; |
| |
| /* Copy cipher data to tpm object */ |
| TPM2B_PUBLIC_KEY_RSA *aux_data = (TPM2B_PUBLIC_KEY_RSA *)&context->aux_data; |
| aux_data->size = context->cmd.Data_EncryptDecrypt.numBytes; |
| memcpy(&aux_data->buffer[0], context->cmd.Data_EncryptDecrypt.in_data, |
| aux_data->size); |
| |
| /* Decrypt the actual data. */ |
| r = Esys_RSA_Decrypt_Async(context->esys, |
| context->cmd.Data_EncryptDecrypt.key_handle, |
| command->auth_session, ESYS_TR_NONE, ESYS_TR_NONE, |
| aux_data, |
| &command->profile->rsa_decrypt_scheme, |
| &null_data); |
| goto_if_error(r, "Error esys rsa decrypt", error_cleanup); |
| |
| fallthrough; |
| |
| statecase(context->state, DATA_DECRYPT_WAIT_FOR_RSA_DECRYPTION); |
| r = Esys_RSA_Decrypt_Finish(context->esys, &tpmPlainText); |
| return_try_again(r); |
| goto_if_error_reset_state(r, "RSA decryption.", error_cleanup); |
| |
| /* Duplicate the decrypted plaintext for returning to the user. */ |
| if (plainTextSize) |
| command->plainTextSize = tpmPlainText->size; |
| if (plainText) { |
| command->plainText = malloc(tpmPlainText->size); |
| goto_if_null(command->plainText, "Out of memory", |
| TSS2_FAPI_RC_MEMORY, error_cleanup); |
| |
| memcpy(command->plainText, &tpmPlainText->buffer[0], tpmPlainText->size); |
| SAFE_FREE(tpmPlainText); |
| } |
| |
| /* Flush the used key. */ |
| if (!command->key_object->misc.key.persistent_handle) { |
| r = Esys_FlushContext_Async(context->esys, |
| command->key_handle); |
| goto_if_error(r, "Error: FlushContext", error_cleanup); |
| } |
| |
| fallthrough; |
| |
| statecase(context->state, DATA_DECRYPT_WAIT_FOR_FLUSH); |
| if (!command->key_object->misc.key.persistent_handle) { |
| r = Esys_FlushContext_Finish(context->esys); |
| return_try_again(r); |
| |
| goto_if_error(r, "Error: FlushContext", error_cleanup); |
| } |
| command->key_handle = ESYS_TR_NONE; |
| fallthrough; |
| |
| statecase(context->state, DATA_DECRYPT_CLEANUP) |
| /* Cleanup session. */ |
| r = ifapi_cleanup_session(context); |
| try_again_or_error_goto(r, "Cleanup", error_cleanup); |
| |
| if (plainText) |
| *plainText = command->plainText; |
| if (plainTextSize) |
| *plainTextSize = command->plainTextSize; |
| break; |
| |
| statecasedefault(context->state); |
| } |
| |
| context->state = _FAPI_STATE_INIT; |
| |
| /* Cleanup of local objects */ |
| SAFE_FREE(tpmPlainText); |
| |
| /* Cleanup of command related objects */ |
| ifapi_cleanup_ifapi_object(command->key_object); |
| SAFE_FREE(command->keyPath); |
| SAFE_FREE(command->in_data); |
| |
| /* Cleanup of context related objects */ |
| ifapi_cleanup_ifapi_object(&context->createPrimary.pkey_object); |
| ifapi_cleanup_ifapi_object(context->loadKey.key_object); |
| |
| LOG_TRACE("finished"); |
| return TSS2_RC_SUCCESS; |
| |
| error_cleanup: |
| /* Cleanup of local objects */ |
| SAFE_FREE(tpmPlainText); |
| |
| /* Cleanup of command related objects */ |
| ifapi_cleanup_ifapi_object(command->key_object); |
| SAFE_FREE(command->keyPath); |
| SAFE_FREE(command->in_data); |
| SAFE_FREE(command->plainText); |
| |
| /* Cleanup of context related objects */ |
| if (command->key_handle != ESYS_TR_NONE) |
| Esys_FlushContext(context->esys, command->key_handle); |
| ifapi_session_clean(context); |
| ifapi_cleanup_ifapi_object(&context->createPrimary.pkey_object); |
| ifapi_cleanup_ifapi_object(&context->loadKey.auth_object); |
| ifapi_cleanup_ifapi_object(context->loadKey.key_object); |
| |
| return r; |
| } |