241 lines
8 KiB
C
241 lines
8 KiB
C
/* ssl/dtls1.h */
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/*
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* DTLS implementation written by Nagendra Modadugu
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* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
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*/
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/* ====================================================================
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* Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#ifndef HEADER_DTLS1_H
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# define HEADER_DTLS1_H
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# include <openssl/buffer.h>
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# include <openssl/pqueue.h>
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# ifdef OPENSSL_SYS_VMS
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# include <resource.h>
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# include <sys/timeb.h>
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# endif
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# ifdef OPENSSL_SYS_WIN32
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/* Needed for struct timeval */
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# include <winsock.h>
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# elif defined(OPENSSL_SYS_NETWARE) && !defined(_WINSOCK2API_)
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# include <sys/timeval.h>
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# else
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# include <sys/time.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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# define DTLS1_VERSION 0xFEFF
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# define DTLS_MAX_VERSION DTLS1_VERSION
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# define DTLS1_BAD_VER 0x0100
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# if 0
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/* this alert description is not specified anywhere... */
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# define DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 110
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# endif
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/* lengths of messages */
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# define DTLS1_COOKIE_LENGTH 256
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# define DTLS1_RT_HEADER_LENGTH 13
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# define DTLS1_HM_HEADER_LENGTH 12
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# define DTLS1_HM_BAD_FRAGMENT -2
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# define DTLS1_HM_FRAGMENT_RETRY -3
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# define DTLS1_CCS_HEADER_LENGTH 1
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# ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
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# define DTLS1_AL_HEADER_LENGTH 7
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# else
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# define DTLS1_AL_HEADER_LENGTH 2
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# endif
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/* Max MTU overhead we know about so far is 40 for IPv6 + 8 for UDP */
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# define DTLS1_MAX_MTU_OVERHEAD 48
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typedef struct dtls1_bitmap_st {
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unsigned long map; /* track 32 packets on 32-bit systems and 64
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* - on 64-bit systems */
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unsigned char max_seq_num[8]; /* max record number seen so far, 64-bit
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* value in big-endian encoding */
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} DTLS1_BITMAP;
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struct dtls1_retransmit_state {
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EVP_CIPHER_CTX *enc_write_ctx; /* cryptographic state */
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EVP_MD_CTX *write_hash; /* used for mac generation */
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# ifndef OPENSSL_NO_COMP
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COMP_CTX *compress; /* compression */
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# else
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char *compress;
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# endif
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SSL_SESSION *session;
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unsigned short epoch;
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};
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struct hm_header_st {
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unsigned char type;
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unsigned long msg_len;
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unsigned short seq;
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unsigned long frag_off;
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unsigned long frag_len;
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unsigned int is_ccs;
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struct dtls1_retransmit_state saved_retransmit_state;
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};
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struct ccs_header_st {
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unsigned char type;
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unsigned short seq;
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};
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struct dtls1_timeout_st {
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/* Number of read timeouts so far */
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unsigned int read_timeouts;
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/* Number of write timeouts so far */
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unsigned int write_timeouts;
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/* Number of alerts received so far */
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unsigned int num_alerts;
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};
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typedef struct record_pqueue_st {
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unsigned short epoch;
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pqueue q;
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} record_pqueue;
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typedef struct hm_fragment_st {
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struct hm_header_st msg_header;
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unsigned char *fragment;
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unsigned char *reassembly;
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} hm_fragment;
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typedef struct dtls1_state_st {
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unsigned int send_cookie;
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unsigned char cookie[DTLS1_COOKIE_LENGTH];
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unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
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unsigned int cookie_len;
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/*
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* The current data and handshake epoch. This is initially
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* undefined, and starts at zero once the initial handshake is
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* completed
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*/
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unsigned short r_epoch;
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unsigned short w_epoch;
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/* records being received in the current epoch */
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DTLS1_BITMAP bitmap;
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/* renegotiation starts a new set of sequence numbers */
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DTLS1_BITMAP next_bitmap;
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/* handshake message numbers */
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unsigned short handshake_write_seq;
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unsigned short next_handshake_write_seq;
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unsigned short handshake_read_seq;
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/* save last sequence number for retransmissions */
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unsigned char last_write_sequence[8];
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/* Received handshake records (processed and unprocessed) */
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record_pqueue unprocessed_rcds;
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record_pqueue processed_rcds;
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/* Buffered handshake messages */
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pqueue buffered_messages;
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/* Buffered (sent) handshake records */
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pqueue sent_messages;
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/*
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* Buffered application records. Only for records between CCS and
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* Finished to prevent either protocol violation or unnecessary message
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* loss.
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*/
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record_pqueue buffered_app_data;
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/* Is set when listening for new connections with dtls1_listen() */
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unsigned int listen;
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unsigned int link_mtu; /* max on-the-wire DTLS packet size */
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unsigned int mtu; /* max DTLS packet size */
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struct hm_header_st w_msg_hdr;
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struct hm_header_st r_msg_hdr;
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struct dtls1_timeout_st timeout;
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/* Indicates when the last handshake msg sent will timeout */
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struct timeval next_timeout;
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/* Timeout duration */
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unsigned short timeout_duration;
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/*
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* storage for Alert/Handshake protocol data received but not yet
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* processed by ssl3_read_bytes:
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*/
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unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH];
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unsigned int alert_fragment_len;
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unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH];
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unsigned int handshake_fragment_len;
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unsigned int retransmitting;
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unsigned int change_cipher_spec_ok;
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} DTLS1_STATE;
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typedef struct dtls1_record_data_st {
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unsigned char *packet;
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unsigned int packet_length;
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SSL3_BUFFER rbuf;
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SSL3_RECORD rrec;
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} DTLS1_RECORD_DATA;
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/* Timeout multipliers (timeout slice is defined in apps/timeouts.h */
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# define DTLS1_TMO_READ_COUNT 2
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# define DTLS1_TMO_WRITE_COUNT 2
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# define DTLS1_TMO_ALERT_COUNT 12
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#ifdef __cplusplus
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}
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#endif
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#endif
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