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298 lines
10 KiB
C
298 lines
10 KiB
C
/* quic.h
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*
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* Copyright (C) 2006-2021 wolfSSL Inc.
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*
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* This file is part of wolfSSL.
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*/
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/* wolfSSL QUIC API */
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#ifndef WOLFSSL_QUIC_H
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#define WOLFSSL_QUIC_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef WOLFSSL_QUIC
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/* QUIC operates on three encryption levels which determine
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* which keys/algos are used for de-/encryption. These are
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* kept separately for incoming and outgoing data and.
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* Due to the nature of UDP, more than one might be in use
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* at the same time due to resends or out-of-order arrivals.
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*/
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typedef enum wolfssl_encryption_level_t {
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wolfssl_encryption_initial = 0,
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wolfssl_encryption_early_data,
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wolfssl_encryption_handshake,
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wolfssl_encryption_application
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} WOLFSSL_ENCRYPTION_LEVEL;
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/* All QUIC related callbacks to the application.
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*/
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typedef struct wolfssl_quic_method_t WOLFSSL_QUIC_METHOD;
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struct wolfssl_quic_method_t {
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/**
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* Provide secrets to the QUIC stack when they becaome available in the SSL
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* instance during handshake processing. read/write secrets have the same
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* length. A call may only provide one, passing NULL as the other.
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*/
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int (*set_encryption_secrets)(WOLFSSL* ssl, WOLFSSL_ENCRYPTION_LEVEL level,
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const uint8_t* read_secret,
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const uint8_t* write_secret,
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size_t secret_len);
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/**
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* Provide handshake packets to the QUIC stack to send to the peer. The
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* QUIC stack will wrap these and take care of re-transmissions.
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*/
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int (*add_handshake_data)(WOLFSSL* ssl, WOLFSSL_ENCRYPTION_LEVEL level,
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const uint8_t* data, size_t len);
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/**
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* Flush any buffered packets during handshake.
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*/
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int (*flush_flight)(WOLFSSL* ssl);
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/**
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* Send a TLS alert that happend during handshake. In QUIC, such alerts
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* lead to connection shutdown.
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*/
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int (*send_alert)(WOLFSSL* ssl, WOLFSSL_ENCRYPTION_LEVEL level,
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uint8_t alert);
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};
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/**
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* Mark the given SSL context for QUIC protocol handling. Meaning all
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* SSL instances derived from it will inherit this. Provides all callbacks
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* to the QUIC application the SSL stack needs.
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*/
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WOLFSSL_API
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int wolfSSL_CTX_set_quic_method(WOLFSSL_CTX* ctx,
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const WOLFSSL_QUIC_METHOD* quic_method);
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/**
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* Mark extactly this SSL instance for QUIC protocol handling.
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* Provides all callbacks to the QUIC application the SSL stack needs.
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*/
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WOLFSSL_API
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int wolfSSL_set_quic_method(WOLFSSL* ssl,
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const WOLFSSL_QUIC_METHOD* quic_method);
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/**
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* Check if QUIC handling has been installed on the given SSL instance.
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*/
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WOLFSSL_API int wolfSSL_is_quic(WOLFSSL* ssl);
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/**
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* Return the current encryption level of the SSL instance for READs.
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*/
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WOLFSSL_API
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WOLFSSL_ENCRYPTION_LEVEL wolfSSL_quic_read_level(const WOLFSSL* ssl);
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/**
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* Return the current encryption level of the SSL instance for WRITEs.
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*/
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WOLFSSL_API
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WOLFSSL_ENCRYPTION_LEVEL wolfSSL_quic_write_level(const WOLFSSL* ssl);
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/**
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* Configure the QUIC transport version to use. On `use_legacy` != 0,
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* selects TLSX_KEY_QUIC_TP_PARAMS_DRAFT, otherwise TLSX_KEY_QUIC_TP_PARAMS.
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* This method is part of the BoringSSL API and replicated here for app
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* portability (as in quictls/openssl).
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*/
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WOLFSSL_API
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void wolfSSL_set_quic_use_legacy_codepoint(WOLFSSL* ssl, int use_legacy);
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/**
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* Set the TLS extension for the transport parameter version to announce
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* to the peer. Known values are TLSX_KEY_QUIC_TP_PARAMS (V1) and
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* TLSX_KEY_QUIC_TP_PARAMS_DRAFT.
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* Setting it to 0 will announce both V1 and draft versions to a server.
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* Servers will, on 0, select the latest version seen from the client.
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* Default is 0.
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*/
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WOLFSSL_API
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void wolfSSL_set_quic_transport_version(WOLFSSL* ssl, int version);
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/**
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* Get the configured transport version.
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*/
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WOLFSSL_API int wolfSSL_get_quic_transport_version(const WOLFSSL* ssl);
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/**
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* Set the raw QUIC transport parameter that will be sent in the TLS extension
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* to the peer, using the configured transport version(s).
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*/
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WOLFSSL_API int wolfSSL_set_quic_transport_params(WOLFSSL* ssl,
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const uint8_t* params,
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size_t params_len);
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/**
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* Get the raw QUIC transport parameter as retrieved via TLS Extension
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* from the peer. If the peer announced several versions,
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* return the latest one.
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* If the extension has not arrived yet, initializes out parameter to
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* NULL, resp. 0.
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*/
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WOLFSSL_API
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void wolfSSL_get_peer_quic_transport_params(const WOLFSSL* ssl,
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const uint8_t* *out_params,
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size_t* out_params_len);
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/**
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* Get the QUIC version negotiated with the peer during the handshake.
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*/
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WOLFSSL_API int wolfSSL_get_peer_quic_transport_version(const WOLFSSL* ssl);
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#ifdef WOLFSSL_EARLY_DATA
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WOLFSSL_API void wolfSSL_set_quic_early_data_enabled(WOLFSSL* ssl, int enabled);
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#endif
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/**
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* Advisory amount of the maximum data a QUIC protocol handler should have
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* in flight. This varies during handshake processing, for example certficate
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* exchange will increase the limit.
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*/
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WOLFSSL_API
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size_t wolfSSL_quic_max_handshake_flight_len(const WOLFSSL* ssl,
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WOLFSSL_ENCRYPTION_LEVEL level);
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/**
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* The QUIC protocol handler provides peer TLS records to the SSL instance
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* during handshake to progress it. The SSL instance will use the registered
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* callbacks to send packets to the peer.
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* Encryption level is provided to indicate how to decrypt the data. Data may
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* be added for levels not yet reached by the SSL instance. However, data
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* may only be added in ever increasing levels and levels may only increase
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* at TLS record boundaries. Any violation will make this function fail.
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*/
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WOLFSSL_API
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int wolfSSL_provide_quic_data(WOLFSSL* ssl, WOLFSSL_ENCRYPTION_LEVEL level,
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const uint8_t* data, size_t len);
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WOLFSSL_API
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int wolfSSL_quic_do_handshake(WOLFSSL* ssl);
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/**
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* Process any CRYPTO data added post-handshake.
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*/
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WOLFSSL_API int wolfSSL_process_quic_post_handshake(WOLFSSL* ssl);
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/**
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* Process any pending input and flush all output. Can be invoked
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* during and/or after handshake processing.
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*/
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WOLFSSL_API int wolfSSL_quic_read_write(WOLFSSL* ssl);
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/**
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* Get the AEAD cipher that is currently selected in the SSL instance.
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* Will return NULL if none has been selected so far. This is used by the
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* QUIC stack to encrypt/decrypt packets after the handshake.
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*/
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WOLFSSL_API const WOLFSSL_EVP_CIPHER* wolfSSL_quic_get_aead(WOLFSSL* ssl);
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/**
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* Use to classify the AEAD cipher for key reuse limits.
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*/
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WOLFSSL_API int wolfSSL_quic_aead_is_gcm(const WOLFSSL_EVP_CIPHER* aead_cipher);
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WOLFSSL_API int wolfSSL_quic_aead_is_ccm(const WOLFSSL_EVP_CIPHER* aead_cipher);
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WOLFSSL_API
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int wolfSSL_quic_aead_is_chacha20(const WOLFSSL_EVP_CIPHER* aead_cipher);
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/**
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* Get the 'tag' length used by the AEAD cipher. Encryption buffer lengths
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* are plaintext length plus this tag length.
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*/
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WOLFSSL_API
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size_t wolfSSL_quic_get_aead_tag_len(const WOLFSSL_EVP_CIPHER* aead_cipher);
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/**
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* The message digest currently selected in the SSL instance.
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*/
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WOLFSSL_API const WOLFSSL_EVP_MD* wolfSSL_quic_get_md(WOLFSSL* ssl);
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/**
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* The QUIC header protection cipher matching the AEAD cipher currently
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* selected in the SSL instance.
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*/
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WOLFSSL_API const WOLFSSL_EVP_CIPHER* wolfSSL_quic_get_hp(WOLFSSL* ssl);
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/**
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* Create and initialize a cipher context for use in en- or decryption.
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*/
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WOLFSSL_API WOLFSSL_EVP_CIPHER_CTX*
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wolfSSL_quic_crypt_new(const WOLFSSL_EVP_CIPHER* cipher,
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const uint8_t* key, const uint8_t* iv, int encrypt);
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/**
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* Use a previously created cipher context to encrypt the given plain text.
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*/
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WOLFSSL_API
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int wolfSSL_quic_aead_encrypt(uint8_t* dest, WOLFSSL_EVP_CIPHER_CTX* aead_ctx,
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const uint8_t* plain, size_t plainlen,
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const uint8_t* iv, const uint8_t* aad,
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size_t aadlen);
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/**
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* Use a previously created cipher context to decrypt the given encoded text.
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*/
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WOLFSSL_API
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int wolfSSL_quic_aead_decrypt(uint8_t* dest, WOLFSSL_EVP_CIPHER_CTX* ctx,
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const uint8_t* enc, size_t enclen,
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const uint8_t* iv, const uint8_t* aad,
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size_t aadlen);
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/**
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* Extract a pseudo-random key, using the given message digest, a secret
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* and a salt. The key size is the size of the digest.
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*/
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WOLFSSL_API
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int wolfSSL_quic_hkdf_extract(uint8_t* dest, const WOLFSSL_EVP_MD* md,
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const uint8_t* secret, size_t secretlen,
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const uint8_t* salt, size_t saltlen);
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/**
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* Expand a pseudo-random key (secret) into a new key, using the mesasge
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* digest and the info bytes.
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*/
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WOLFSSL_API
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int wolfSSL_quic_hkdf_expand(uint8_t* dest, size_t destlen,
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const WOLFSSL_EVP_MD* md,
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const uint8_t* secret, size_t secretlen,
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const uint8_t* info, size_t infolen);
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/**
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* Extract and extpand secret, salt and info into a new key.
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*/
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WOLFSSL_API
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int wolfSSL_quic_hkdf(uint8_t* dest, size_t destlen,
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const WOLFSSL_EVP_MD* md,
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const uint8_t* secret, size_t secretlen,
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const uint8_t* salt, size_t saltlen,
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const uint8_t* info, size_t infolen);
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#endif /* WOLFSSL_QUIC */
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* WOLFSSL_QUIC_H */
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