crypto/openssl-0.9/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 IMPLEMENT_dtls1_meth_func(dtlsv1_base_method,
  88                         ssl_undefined_function,
  89                         ssl_undefined_function,
  90                         ssl_bad_method)
  91
  92 int dtls1_new(SSL *s)
  93         {
  94         DTLS1_STATE *d1;
  95
  96         if (!ssl3_new(s)) return(0);
  97         if ((d1=OPENSSL_malloc(sizeof *d1)) == NULL) return (0);
  98         memset(d1,0, sizeof *d1);
  99
 100         /* d1->handshake_epoch=0; */
 101 #if defined(OPENSSL_SYS_VMS) || defined(VMS_TEST)
 102         d1->bitmap.length=64;
 103 #else
 104         d1->bitmap.length=sizeof(d1->bitmap.map) * 8;
 105 #endif
 106         pq_64bit_init(&(d1->bitmap.map));
 107         pq_64bit_init(&(d1->bitmap.max_seq_num));
 108
 109         pq_64bit_init(&(d1->next_bitmap.map));
 110         pq_64bit_init(&(d1->next_bitmap.max_seq_num));
 111
 112         d1->unprocessed_rcds.q=pqueue_new();
 113         d1->processed_rcds.q=pqueue_new();
 114         d1->buffered_messages = pqueue_new();
 115         d1->sent_messages=pqueue_new();
 116
 117         if ( s->server)
 118                 {
 119                 d1->cookie_len = sizeof(s->d1->cookie);
 120                 }
 121
 122         if( ! d1->unprocessed_rcds.q || ! d1->processed_rcds.q
 123         || ! d1->buffered_messages || ! d1->sent_messages)
 124                 {
 125         if ( d1->unprocessed_rcds.q) pqueue_free(d1->unprocessed_rcds.q);
 126         if ( d1->processed_rcds.q) pqueue_free(d1->processed_rcds.q);
 127         if ( d1->buffered_messages) pqueue_free(d1->buffered_messages);
 128                 if ( d1->sent_messages) pqueue_free(d1->sent_messages);
 129                 OPENSSL_free(d1);
 130                 return (0);
 131                 }
 132
 133         s->d1=d1;
 134         s->method->ssl_clear(s);
 135         return(1);
 136         }
 137
 138 void dtls1_free(SSL *s)
 139         {
 140     pitem *item = NULL;
 141     hm_fragment *frag = NULL;
 142
 143         ssl3_free(s);
 144
 145     while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL)
 146         {
 147         OPENSSL_free(item->data);
 148         pitem_free(item);
 149         }
 150     pqueue_free(s->d1->unprocessed_rcds.q);
 151
 152     while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL)
 153         {
 154         OPENSSL_free(item->data);
 155         pitem_free(item);
 156         }
 157     pqueue_free(s->d1->processed_rcds.q);
 158
 159     while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL)
 160         {
 161         frag = (hm_fragment *)item->data;
 162         OPENSSL_free(frag->fragment);
 163         OPENSSL_free(frag);
 164         pitem_free(item);
 165         }
 166     pqueue_free(s->d1->buffered_messages);
 167
 168     while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
 169         {
 170         frag = (hm_fragment *)item->data;
 171         OPENSSL_free(frag->fragment);
 172         OPENSSL_free(frag);
 173         pitem_free(item);
 174         }
 175         pqueue_free(s->d1->sent_messages);
 176
 177         pq_64bit_free(&(s->d1->bitmap.map));
 178         pq_64bit_free(&(s->d1->bitmap.max_seq_num));
 179
 180         pq_64bit_free(&(s->d1->next_bitmap.map));
 181         pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
 182
 183         OPENSSL_free(s->d1);
 184         }
 185
 186 void dtls1_clear(SSL *s)
 187         {
 188         ssl3_clear(s);
 189         s->version=DTLS1_VERSION;
 190         }
 191
 192 /*
 193  * As it's impossible to use stream ciphers in "datagram" mode, this
 194  * simple filter is designed to disengage them in DTLS. Unfortunately
 195  * there is no universal way to identify stream SSL_CIPHER, so we have
 196  * to explicitly list their SSL_* codes. Currently RC4 is the only one
 197  * available, but if new ones emerge, they will have to be added...
 198  */
 199 SSL_CIPHER *dtls1_get_cipher(unsigned int u)
 200         {
 201         SSL_CIPHER *ciph = ssl3_get_cipher(u);
 202
 203         if (ciph != NULL)
 204                 {
 205                 if ((ciph->algorithms&SSL_ENC_MASK) == SSL_RC4)
 206                         return NULL;
 207                 }
 208
 209         return ciph;
 210         }