ssl/d1_lib.c

   1 /* ssl/d1_lib.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61 #include <openssl/objects.h>
  62 #include "ssl_locl.h"
  63
  64 const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT;
  65
  66 SSL3_ENC_METHOD DTLSv1_enc_data={
  67     dtls1_enc,
  68         tls1_mac,
  69         tls1_setup_key_block,
  70         tls1_generate_master_secret,
  71         tls1_change_cipher_state,
  72         tls1_final_finish_mac,
  73         TLS1_FINISH_MAC_LENGTH,
  74         tls1_cert_verify_mac,
  75         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
  76         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
  77         tls1_alert_code,
  78         };
  79
  80 long dtls1_default_timeout(void)
  81         {
  82         /* 2 hours, the 24 hours mentioned in the DTLSv1 spec
  83          * is way too long for http, the cache would over fill */
  84         return(60*60*2);
  85         }
  86
  87 int dtls1_new(SSL *s)
  88         {
  89         DTLS1_STATE *d1;
  90
  91         if (!ssl3_new(s)) return(0);
  92         if ((d1=OPENSSL_malloc(sizeof *d1)) == NULL) return (0);
  93         memset(d1,0, sizeof *d1);
  94
  95         /* d1->handshake_epoch=0; */
  96
  97         d1->unprocessed_rcds.q=pqueue_new();
  98         d1->processed_rcds.q=pqueue_new();
  99         d1->buffered_messages = pqueue_new();
 100         d1->sent_messages=pqueue_new();
 101
 102         if ( s->server)
 103                 {
 104                 d1->cookie_len = sizeof(s->d1->cookie);
 105                 }
 106
 107         if( ! d1->unprocessed_rcds.q || ! d1->processed_rcds.q
 108         || ! d1->buffered_messages || ! d1->sent_messages)
 109                 {
 110         if ( d1->unprocessed_rcds.q) pqueue_free(d1->unprocessed_rcds.q);
 111         if ( d1->processed_rcds.q) pqueue_free(d1->processed_rcds.q);
 112         if ( d1->buffered_messages) pqueue_free(d1->buffered_messages);
 113                 if ( d1->sent_messages) pqueue_free(d1->sent_messages);
 114                 OPENSSL_free(d1);
 115                 return (0);
 116                 }
 117
 118         s->d1=d1;
 119         s->method->ssl_clear(s);
 120         return(1);
 121         }
 122
 123 void dtls1_free(SSL *s)
 124         {
 125     pitem *item = NULL;
 126     hm_fragment *frag = NULL;
 127
 128         ssl3_free(s);
 129
 130     while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL)
 131         {
 132         OPENSSL_free(item->data);
 133         pitem_free(item);
 134         }
 135     pqueue_free(s->d1->unprocessed_rcds.q);
 136
 137     while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL)
 138         {
 139         OPENSSL_free(item->data);
 140         pitem_free(item);
 141         }
 142     pqueue_free(s->d1->processed_rcds.q);
 143
 144     while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL)
 145         {
 146         frag = (hm_fragment *)item->data;
 147         OPENSSL_free(frag->fragment);
 148         OPENSSL_free(frag);
 149         pitem_free(item);
 150         }
 151     pqueue_free(s->d1->buffered_messages);
 152
 153     while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
 154         {
 155         frag = (hm_fragment *)item->data;
 156         OPENSSL_free(frag->fragment);
 157         OPENSSL_free(frag);
 158         pitem_free(item);
 159         }
 160         pqueue_free(s->d1->sent_messages);
 161
 162         OPENSSL_free(s->d1);
 163         }
 164
 165 void dtls1_clear(SSL *s)
 166         {
 167         ssl3_clear(s);
 168         s->version=DTLS1_VERSION;
 169         }
 170
 171 /*
 172  * As it's impossible to use stream ciphers in "datagram" mode, this
 173  * simple filter is designed to disengage them in DTLS. Unfortunately
 174  * there is no universal way to identify stream SSL_CIPHER, so we have
 175  * to explicitly list their SSL_* codes. Currently RC4 is the only one
 176  * available, but if new ones emerge, they will have to be added...
 177  */
 178 SSL_CIPHER *dtls1_get_cipher(unsigned int u)
 179         {
 180         SSL_CIPHER *ciph = ssl3_get_cipher(u);
 181
 182         if (ciph != NULL)
 183                 {
 184                 if (ciph->algorithm_enc == SSL_RC4)
 185                         return NULL;
 186                 }
 187
 188         return ciph;
 189         }