137 lines
4.2 KiB
C
137 lines
4.2 KiB
C
/**
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* \file ssl_ticket.h
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*
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* \brief TLS server ticket callbacks implementation
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*/
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/*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#ifndef MBEDTLS_SSL_TICKET_H
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#define MBEDTLS_SSL_TICKET_H
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/*
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* This implementation of the session ticket callbacks includes key
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* management, rotating the keys periodically in order to preserve forward
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* secrecy, when MBEDTLS_HAVE_TIME is defined.
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*/
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#include "ssl.h"
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#include "cipher.h"
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#if defined(MBEDTLS_THREADING_C)
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#include "threading.h"
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief Information for session ticket protection
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*/
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typedef struct
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{
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unsigned char name[4]; /*!< random key identifier */
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uint32_t generation_time; /*!< key generation timestamp (seconds) */
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mbedtls_cipher_context_t ctx; /*!< context for auth enc/decryption */
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}
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mbedtls_ssl_ticket_key;
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/**
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* \brief Context for session ticket handling functions
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*/
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typedef struct
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{
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mbedtls_ssl_ticket_key keys[2]; /*!< ticket protection keys */
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unsigned char active; /*!< index of the currently active key */
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uint32_t ticket_lifetime; /*!< lifetime of tickets in seconds */
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/** Callback for getting (pseudo-)random numbers */
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int (*f_rng)(void *, unsigned char *, size_t);
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void *p_rng; /*!< context for the RNG function */
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#if defined(MBEDTLS_THREADING_C)
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mbedtls_threading_mutex_t mutex;
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#endif
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}
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mbedtls_ssl_ticket_context;
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/**
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* \brief Initialize a ticket context.
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* (Just make it ready for mbedtls_ssl_ticket_setup()
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* or mbedtls_ssl_ticket_free().)
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*
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* \param ctx Context to be initialized
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*/
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void mbedtls_ssl_ticket_init( mbedtls_ssl_ticket_context *ctx );
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/**
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* \brief Prepare context to be actually used
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*
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* \param ctx Context to be set up
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* \param f_rng RNG callback function
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* \param p_rng RNG callback context
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* \param cipher AEAD cipher to use for ticket protection.
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* Recommended value: MBEDTLS_CIPHER_AES_256_GCM.
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* \param lifetime Tickets lifetime in seconds
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* Recommended value: 86400 (one day).
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*
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* \note It is highly recommended to select a cipher that is at
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* least as strong as the the strongest ciphersuite
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* supported. Usually that means a 256-bit key.
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*
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* \note The lifetime of the keys is twice the lifetime of tickets.
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* It is recommended to pick a reasonnable lifetime so as not
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* to negate the benefits of forward secrecy.
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*
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* \return 0 if successful,
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* or a specific MBEDTLS_ERR_XXX error code
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*/
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int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
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mbedtls_cipher_type_t cipher,
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uint32_t lifetime );
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/**
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* \brief Implementation of the ticket write callback
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*
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* \note See \c mbedlts_ssl_ticket_write_t for description
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*/
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mbedtls_ssl_ticket_write_t mbedtls_ssl_ticket_write;
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/**
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* \brief Implementation of the ticket parse callback
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*
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* \note See \c mbedlts_ssl_ticket_parse_t for description
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*/
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mbedtls_ssl_ticket_parse_t mbedtls_ssl_ticket_parse;
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/**
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* \brief Free a context's content and zeroize it.
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*
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* \param ctx Context to be cleaned up
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*/
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void mbedtls_ssl_ticket_free( mbedtls_ssl_ticket_context *ctx );
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#ifdef __cplusplus
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}
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#endif
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#endif /* ssl_ticket.h */
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