3 * DTLS implementation written by Nagendra Modadugu
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4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
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6 /* ====================================================================
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7 * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
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9 * Redistribution and use in source and binary forms, with or without
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10 * modification, are permitted provided that the following conditions
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13 * 1. Redistributions of source code must retain the above copyright
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14 * notice, this list of conditions and the following disclaimer.
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16 * 2. Redistributions in binary form must reproduce the above copyright
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17 * notice, this list of conditions and the following disclaimer in
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18 * the documentation and/or other materials provided with the
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21 * 3. All advertising materials mentioning features or use of this
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22 * software must display the following acknowledgment:
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23 * "This product includes software developed by the OpenSSL Project
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24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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27 * endorse or promote products derived from this software without
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28 * prior written permission. For written permission, please contact
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29 * openssl-core@OpenSSL.org.
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31 * 5. Products derived from this software may not be called "OpenSSL"
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32 * nor may "OpenSSL" appear in their names without prior written
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33 * permission of the OpenSSL Project.
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35 * 6. Redistributions of any form whatsoever must retain the following
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37 * "This product includes software developed by the OpenSSL Project
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38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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51 * OF THE POSSIBILITY OF SUCH DAMAGE.
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52 * ====================================================================
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54 * This product includes cryptographic software written by Eric Young
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55 * (eay@cryptsoft.com). This product includes software written by Tim
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56 * Hudson (tjh@cryptsoft.com).
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60 #ifndef HEADER_DTLS1_H
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61 # define HEADER_DTLS1_H
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63 # include <openssl/buffer.h>
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64 # include <openssl/pqueue.h>
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65 # ifdef OPENSSL_SYS_VMS
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66 # include <resource.h>
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67 # include <sys/timeb.h>
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69 # ifdef OPENSSL_SYS_WIN32
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70 /* Needed for struct timeval */
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71 # include <winsock.h>
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72 # elif defined(OPENSSL_SYS_NETWARE) && !defined(_WINSOCK2API_)
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73 # include <sys/timeval.h>
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75 # if defined(OPENSSL_SYS_VXWORKS)
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76 # include <sys/times.h>
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78 # include <sys/time.h>
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86 # define DTLS1_VERSION 0xFEFF
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87 # define DTLS1_2_VERSION 0xFEFD
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88 # define DTLS_MAX_VERSION DTLS1_2_VERSION
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89 # define DTLS1_VERSION_MAJOR 0xFE
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91 # define DTLS1_BAD_VER 0x0100
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93 /* Special value for method supporting multiple versions */
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94 # define DTLS_ANY_VERSION 0x1FFFF
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97 /* this alert description is not specified anywhere... */
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98 # define DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 110
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101 /* lengths of messages */
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102 # define DTLS1_COOKIE_LENGTH 256
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104 # define DTLS1_RT_HEADER_LENGTH 13
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106 # define DTLS1_HM_HEADER_LENGTH 12
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108 # define DTLS1_HM_BAD_FRAGMENT -2
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109 # define DTLS1_HM_FRAGMENT_RETRY -3
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111 # define DTLS1_CCS_HEADER_LENGTH 1
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113 # ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
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114 # define DTLS1_AL_HEADER_LENGTH 7
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116 # define DTLS1_AL_HEADER_LENGTH 2
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119 # ifndef OPENSSL_NO_SSL_INTERN
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121 # ifndef OPENSSL_NO_SCTP
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122 # define DTLS1_SCTP_AUTH_LABEL "EXPORTER_DTLS_OVER_SCTP"
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125 /* Max MTU overhead we know about so far is 40 for IPv6 + 8 for UDP */
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126 # define DTLS1_MAX_MTU_OVERHEAD 48
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128 typedef struct dtls1_bitmap_st {
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129 unsigned long map; /* track 32 packets on 32-bit systems and 64
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130 * - on 64-bit systems */
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131 unsigned char max_seq_num[8]; /* max record number seen so far, 64-bit
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132 * value in big-endian encoding */
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135 struct dtls1_retransmit_state {
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136 EVP_CIPHER_CTX *enc_write_ctx; /* cryptographic state */
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137 EVP_MD_CTX *write_hash; /* used for mac generation */
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138 # ifndef OPENSSL_NO_COMP
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139 COMP_CTX *compress; /* compression */
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143 SSL_SESSION *session;
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144 unsigned short epoch;
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147 struct hm_header_st {
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148 unsigned char type;
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149 unsigned long msg_len;
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150 unsigned short seq;
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151 unsigned long frag_off;
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152 unsigned long frag_len;
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153 unsigned int is_ccs;
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154 struct dtls1_retransmit_state saved_retransmit_state;
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157 struct ccs_header_st {
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158 unsigned char type;
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159 unsigned short seq;
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162 struct dtls1_timeout_st {
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163 /* Number of read timeouts so far */
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164 unsigned int read_timeouts;
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165 /* Number of write timeouts so far */
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166 unsigned int write_timeouts;
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167 /* Number of alerts received so far */
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168 unsigned int num_alerts;
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171 typedef struct record_pqueue_st {
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172 unsigned short epoch;
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176 typedef struct hm_fragment_st {
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177 struct hm_header_st msg_header;
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178 unsigned char *fragment;
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179 unsigned char *reassembly;
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182 typedef struct dtls1_state_st {
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183 unsigned int send_cookie;
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184 unsigned char cookie[DTLS1_COOKIE_LENGTH];
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185 unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
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186 unsigned int cookie_len;
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188 * The current data and handshake epoch. This is initially
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189 * undefined, and starts at zero once the initial handshake is
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192 unsigned short r_epoch;
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193 unsigned short w_epoch;
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194 /* records being received in the current epoch */
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195 DTLS1_BITMAP bitmap;
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196 /* renegotiation starts a new set of sequence numbers */
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197 DTLS1_BITMAP next_bitmap;
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198 /* handshake message numbers */
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199 unsigned short handshake_write_seq;
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200 unsigned short next_handshake_write_seq;
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201 unsigned short handshake_read_seq;
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202 /* save last sequence number for retransmissions */
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203 unsigned char last_write_sequence[8];
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204 /* Received handshake records (processed and unprocessed) */
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205 record_pqueue unprocessed_rcds;
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206 record_pqueue processed_rcds;
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207 /* Buffered handshake messages */
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208 pqueue buffered_messages;
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209 /* Buffered (sent) handshake records */
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210 pqueue sent_messages;
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212 * Buffered application records. Only for records between CCS and
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213 * Finished to prevent either protocol violation or unnecessary message
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216 record_pqueue buffered_app_data;
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217 /* Is set when listening for new connections with dtls1_listen() */
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218 unsigned int listen;
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219 unsigned int link_mtu; /* max on-the-wire DTLS packet size */
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220 unsigned int mtu; /* max DTLS packet size */
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221 struct hm_header_st w_msg_hdr;
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222 struct hm_header_st r_msg_hdr;
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223 struct dtls1_timeout_st timeout;
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225 * Indicates when the last handshake msg or heartbeat sent will timeout
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227 struct timeval next_timeout;
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228 /* Timeout duration */
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229 unsigned short timeout_duration;
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231 * storage for Alert/Handshake protocol data received but not yet
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232 * processed by ssl3_read_bytes:
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234 unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH];
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235 unsigned int alert_fragment_len;
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236 unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH];
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237 unsigned int handshake_fragment_len;
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238 unsigned int retransmitting;
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240 * Set when the handshake is ready to process peer's ChangeCipherSpec message.
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241 * Cleared after the message has been processed.
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243 unsigned int change_cipher_spec_ok;
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244 # ifndef OPENSSL_NO_SCTP
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245 /* used when SSL_ST_XX_FLUSH is entered */
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247 int shutdown_received;
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251 typedef struct dtls1_record_data_st {
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252 unsigned char *packet;
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253 unsigned int packet_length;
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256 # ifndef OPENSSL_NO_SCTP
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257 struct bio_dgram_sctp_rcvinfo recordinfo;
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259 } DTLS1_RECORD_DATA;
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263 /* Timeout multipliers (timeout slice is defined in apps/timeouts.h */
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264 # define DTLS1_TMO_READ_COUNT 2
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265 # define DTLS1_TMO_WRITE_COUNT 2
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267 # define DTLS1_TMO_ALERT_COUNT 12
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