| /* 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_crypto.h" |
| #include "fapi_int.h" |
| #include "fapi_util.h" |
| #include "tss2_esys.h" |
| #define LOGMODULE fapi |
| #include "util/log.h" |
| #include "util/aux_util.h" |
| |
| /** One-Call function for Fapi_VerifySignature |
| * |
| * Verifies a signature using a public key found in a keyPath. |
| * |
| * @param[in,out] context The FAPI_CONTEXT |
| * @param[in] keyPath The path to the verification public key |
| * @param[in] digest The that was signed. Must be already hashed |
| * @param[in] digestSize the size of digest in bytes |
| * @param[in] signature The signature to be verified |
| * @param[in] signatureSize The size of signature in bytes |
| * |
| * @retval TSS2_RC_SUCCESS: if the function call was a success. |
| * @retval TSS2_FAPI_RC_BAD_REFERENCE: if context, keyPath, signature, or |
| * digest is NULL. |
| * @retval TSS2_FAPI_RC_BAD_CONTEXT: if context corruption is detected. |
| * @retval TSS2_FAPI_RC_KEY_NOT_FOUND: if keyPath does not map to a FAPI object. |
| * @retval TSS2_FAPI_RC_BAD_KEY: if the object at publicKeyPath is not a key, or |
| * is a key that is unsuitable for the requested operation. |
| * @retval TSS2_FAPI_RC_BAD_VALUE: if signature is invalid (has the wrong format) |
| * or if digestSize is zero. |
| * @retval TSS2_FAPI_RC_SIGNATURE_VERIFICATION_FAILED: if the signature fails to |
| * verify. |
| * @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_PATH_NOT_FOUND if a FAPI object path was not found |
| * during authorization. |
| * @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_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_VerifySignature( |
| FAPI_CONTEXT *context, |
| char const *keyPath, |
| uint8_t const *digest, |
| size_t digestSize, |
| uint8_t const *signature, |
| size_t signatureSize) |
| { |
| LOG_TRACE("called for context:%p", context); |
| |
| TSS2_RC r; |
| |
| /* Check for NULL parameters */ |
| check_not_null(context); |
| check_not_null(keyPath); |
| check_not_null(digest); |
| check_not_null(signature); |
| |
| r = Fapi_VerifySignature_Async(context, keyPath, digest, digestSize, |
| signature, signatureSize); |
| return_if_error_reset_state(r, "Key_VerifySignature"); |
| |
| 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_VerifySignature_Finish(context); |
| } while (base_rc(r) == TSS2_BASE_RC_TRY_AGAIN); |
| |
| return_if_error_reset_state(r, "Key_VerifySignature"); |
| |
| LOG_TRACE("finished"); |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Asynchronous function for Fapi_VerifySignature |
| * |
| * Verifies a signature using a public key found in a keyPath. |
| * |
| * Call Fapi_VerifySignature_Finish to finish the execution of this command. |
| * |
| * @param[in,out] context The FAPI_CONTEXT |
| * @param[in] keyPath The path to the verification public key |
| * @param[in] digest The that was signed. Must be already hashed |
| * @param[in] digestSize the size of digest in bytes |
| * @param[in] signature The signature to be verified |
| * @param[in] signatureSize The size of signature in bytes |
| * |
| * @retval TSS2_RC_SUCCESS: if the function call was a success. |
| * @retval TSS2_FAPI_RC_BAD_REFERENCE: if context, keyPath, signature, or |
| * digest is NULL. |
| * @retval TSS2_FAPI_RC_BAD_CONTEXT: if context corruption is detected. |
| * @retval TSS2_FAPI_RC_KEY_NOT_FOUND: if keyPath does not map to a FAPI object. |
| * @retval TSS2_FAPI_RC_BAD_KEY: if the object at publicKeyPath is not a key, or |
| * is a key that is unsuitable for the requested operation. |
| * @retval TSS2_FAPI_RC_BAD_VALUE: if signature is invalid (has the wrong format) |
| * or if digestSize is zero. |
| * @retval TSS2_FAPI_RC_SIGNATURE_VERIFICATION_FAILED: if the signature fails to |
| * verify. |
| * @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_PATH_NOT_FOUND if a FAPI object path was not found |
| * during authorization. |
| * @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_VerifySignature_Async( |
| FAPI_CONTEXT *context, |
| char const *keyPath, |
| uint8_t const *digest, |
| size_t digestSize, |
| uint8_t const *signature, |
| size_t signatureSize) |
| { |
| LOG_TRACE("called for context:%p", context); |
| LOG_TRACE("keyPath: %s", keyPath); |
| if (digest) { |
| LOGBLOB_TRACE(digest, digestSize, "digest"); |
| } else { |
| LOG_TRACE("digset: (null) digestSize: %zi", digestSize); |
| } |
| if (signature) { |
| LOGBLOB_TRACE(signature, signatureSize, "signature"); |
| } else { |
| LOG_TRACE("signature: (null) sigantureSize: %zi", signatureSize); |
| } |
| |
| TSS2_RC r; |
| |
| /* Check for NULL parameters */ |
| check_not_null(context); |
| check_not_null(keyPath); |
| check_not_null(digest); |
| check_not_null(signature); |
| |
| /* Helpful alias pointers */ |
| IFAPI_Key_VerifySignature * command = &context->cmd.Key_VerifySignature; |
| |
| r = ifapi_non_tpm_mode_init(context); |
| return_if_error(r, "Initialize VerifySignature"); |
| |
| /* Copy parameters to context for use during _Finish. */ |
| uint8_t * signatureBuffer = malloc(signatureSize); |
| uint8_t * digestBuffer = malloc(digestSize); |
| goto_if_null2(signatureBuffer, "Out of memory", r, TSS2_FAPI_RC_MEMORY, |
| error_cleanup); |
| goto_if_null2(digestBuffer, "Out of memory", r, TSS2_FAPI_RC_MEMORY, |
| error_cleanup); |
| memcpy(signatureBuffer, signature, signatureSize); |
| memcpy(digestBuffer, digest, digestSize); |
| command->signature = signatureBuffer; |
| command->digest = digestBuffer; |
| command->signatureSize = signatureSize; |
| command->digestSize = digestSize; |
| memset(&command->key_object, 0, sizeof(IFAPI_OBJECT)); |
| |
| /* Load the key for verification from the keystore. */ |
| r = ifapi_keystore_load_async(&context->keystore, &context->io, keyPath); |
| goto_if_error2(r, "Could not open: %s", error_cleanup, keyPath); |
| |
| /* Initialize the context state for this operation. */ |
| LOG_TRACE("finished"); |
| return TSS2_RC_SUCCESS; |
| |
| error_cleanup: |
| /* Cleanup duplicated input parameters that were copied before. */ |
| SAFE_FREE(signatureBuffer); |
| command->signature = NULL; |
| SAFE_FREE(digestBuffer); |
| command->digest = NULL; |
| return r; |
| } |
| |
| /** Asynchronous finish function for Fapi_VerifySignature |
| * |
| * This function should be called after a previous Fapi_VerifySignature_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_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_SIGNATURE_VERIFICATION_FAILED if the signature could not |
| * be verified |
| */ |
| TSS2_RC |
| Fapi_VerifySignature_Finish( |
| FAPI_CONTEXT *context) |
| { |
| LOG_TRACE("called for context:%p", context); |
| |
| TSS2_RC r; |
| |
| /* Check for NULL parameters */ |
| check_not_null(context); |
| |
| /* Helpful alias pointers */ |
| IFAPI_Key_VerifySignature * command = &context->cmd.Key_VerifySignature; |
| |
| r = ifapi_keystore_load_finish(&context->keystore, &context->io, |
| &command->key_object); |
| return_try_again(r); |
| return_if_error_reset_state(r, "read_finish failed"); |
| |
| /* Verify the signature using a helper that tests all known signature schemes. */ |
| r = ifapi_verify_signature(&command->key_object, command->signature, |
| command->signatureSize, command->digest, command->digestSize); |
| goto_if_error(r, "Verify signature.", cleanup); |
| |
| cleanup: |
| /* Cleanup any intermediate results and state stored in the context. */ |
| if (command->key_object.objectType) |
| ifapi_cleanup_ifapi_object(&command->key_object); |
| ifapi_cleanup_ifapi_object(&context->loadKey.auth_object); |
| ifapi_cleanup_ifapi_object(context->loadKey.key_object); |
| ifapi_cleanup_ifapi_object(&context->createPrimary.pkey_object); |
| SAFE_FREE(command->signature); |
| SAFE_FREE(command->digest); |
| LOG_TRACE("finished"); |
| return r; |
| } |