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d1_lib.c

/* ssl/d1_lib.c */
/* 
 * DTLS implementation written by Nagendra Modadugu
 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.  
 */
/* ====================================================================
 * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include <openssl/objects.h>
#include "ssl_locl.h"

const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT;

SSL3_ENC_METHOD DTLSv1_enc_data={
    dtls1_enc,
      tls1_mac,
      tls1_setup_key_block,
      tls1_generate_master_secret,
      tls1_change_cipher_state,
      tls1_final_finish_mac,
      TLS1_FINISH_MAC_LENGTH,
      tls1_cert_verify_mac,
      TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
      TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
      tls1_alert_code,
      };

long dtls1_default_timeout(void)
      {
      /* 2 hours, the 24 hours mentioned in the DTLSv1 spec
       * is way too long for http, the cache would over fill */
      return(60*60*2);
      }

IMPLEMENT_dtls1_meth_func(dtlsv1_base_method,
                  ssl_undefined_function,
                  ssl_undefined_function,
                  ssl_bad_method)

int dtls1_new(SSL *s)
      {
      DTLS1_STATE *d1;

      if (!ssl3_new(s)) return(0);
      if ((d1=OPENSSL_malloc(sizeof *d1)) == NULL) return (0);
      memset(d1,0, sizeof *d1);

      /* d1->handshake_epoch=0; */
#if defined(OPENSSL_SYS_VMS) || defined(VMS_TEST)
      d1->bitmap.length=64;
#else
      d1->bitmap.length=sizeof(d1->bitmap.map) * 8;
#endif
      pq_64bit_init(&(d1->bitmap.map));
      pq_64bit_init(&(d1->bitmap.max_seq_num));
      
      d1->next_bitmap.length = d1->bitmap.length;
      pq_64bit_init(&(d1->next_bitmap.map));
      pq_64bit_init(&(d1->next_bitmap.max_seq_num));

      d1->unprocessed_rcds.q=pqueue_new();
      d1->processed_rcds.q=pqueue_new();
      d1->buffered_messages = pqueue_new();
      d1->sent_messages=pqueue_new();

      if ( s->server)
            {
            d1->cookie_len = sizeof(s->d1->cookie);
            }

      if( ! d1->unprocessed_rcds.q || ! d1->processed_rcds.q 
        || ! d1->buffered_messages || ! d1->sent_messages)
            {
        if ( d1->unprocessed_rcds.q) pqueue_free(d1->unprocessed_rcds.q);
        if ( d1->processed_rcds.q) pqueue_free(d1->processed_rcds.q);
        if ( d1->buffered_messages) pqueue_free(d1->buffered_messages);
            if ( d1->sent_messages) pqueue_free(d1->sent_messages);
            OPENSSL_free(d1);
            return (0);
            }

      s->d1=d1;
      s->method->ssl_clear(s);
      return(1);
      }

void dtls1_free(SSL *s)
      {
    pitem *item = NULL;
    hm_fragment *frag = NULL;

      ssl3_free(s);

    while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL)
        {
        OPENSSL_free(item->data);
        pitem_free(item);
        }
    pqueue_free(s->d1->unprocessed_rcds.q);

    while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL)
        {
        OPENSSL_free(item->data);
        pitem_free(item);
        }
    pqueue_free(s->d1->processed_rcds.q);

    while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL)
        {
        frag = (hm_fragment *)item->data;
        OPENSSL_free(frag->fragment);
        OPENSSL_free(frag);
        pitem_free(item);
        }
    pqueue_free(s->d1->buffered_messages);

    while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
        {
        frag = (hm_fragment *)item->data;
        OPENSSL_free(frag->fragment);
        OPENSSL_free(frag);
        pitem_free(item);
        }
      pqueue_free(s->d1->sent_messages);

      pq_64bit_free(&(s->d1->bitmap.map));
      pq_64bit_free(&(s->d1->bitmap.max_seq_num));

      pq_64bit_free(&(s->d1->next_bitmap.map));
      pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));

      OPENSSL_free(s->d1);
      }

void dtls1_clear(SSL *s)
      {
      ssl3_clear(s);
      s->version=DTLS1_VERSION;
      }

/*
 * As it's impossible to use stream ciphers in "datagram" mode, this
 * simple filter is designed to disengage them in DTLS. Unfortunately
 * there is no universal way to identify stream SSL_CIPHER, so we have
 * to explicitly list their SSL_* codes. Currently RC4 is the only one
 * available, but if new ones emerge, they will have to be added...
 */
SSL_CIPHER *dtls1_get_cipher(unsigned int u)
      {
      SSL_CIPHER *ciph = ssl3_get_cipher(u);

      if (ciph != NULL)
            {
            if ((ciph->algorithms&SSL_ENC_MASK) == SSL_RC4)
                  return NULL;
            }

      return ciph;
      }

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