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:         }