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d1_clnt.c

/* ssl/d1_clnt.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).
 *
 */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "ssl_locl.h"
#include "kssl_lcl.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/md5.h>
#ifndef OPENSSL_NO_DH
#include <openssl/dh.h>
#endif

static SSL_METHOD *dtls1_get_client_method(int ver);
static int dtls1_get_hello_verify(SSL *s);

static SSL_METHOD *dtls1_get_client_method(int ver)
      {
      if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
            return(DTLSv1_client_method());
      else
            return(NULL);
      }

IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
                  ssl_undefined_function,
                  dtls1_connect,
                  dtls1_get_client_method)

int dtls1_connect(SSL *s)
      {
      BUF_MEM *buf=NULL;
      unsigned long Time=(unsigned long)time(NULL),l;
      void (*cb)(const SSL *ssl,int type,int val)=NULL;
      int ret= -1;
      int new_state,state,skip=0;;

      RAND_add(&Time,sizeof(Time),0);
      ERR_clear_error();
      clear_sys_error();

      if (s->info_callback != NULL)
            cb=s->info_callback;
      else if (s->ctx->info_callback != NULL)
            cb=s->ctx->info_callback;
      
      s->in_handshake++;
      if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 

      for (;;)
            {
            state=s->state;

            switch(s->state)
                  {
            case SSL_ST_RENEGOTIATE:
                  s->new_session=1;
                  s->state=SSL_ST_CONNECT;
                  s->ctx->stats.sess_connect_renegotiate++;
                  /* break */
            case SSL_ST_BEFORE:
            case SSL_ST_CONNECT:
            case SSL_ST_BEFORE|SSL_ST_CONNECT:
            case SSL_ST_OK|SSL_ST_CONNECT:

                  s->server=0;
                  if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);

                  if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
                      (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
                        {
                        SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
                        ret = -1;
                        goto end;
                        }
                        
                  /* s->version=SSL3_VERSION; */
                  s->type=SSL_ST_CONNECT;

                  if (s->init_buf == NULL)
                        {
                        if ((buf=BUF_MEM_new()) == NULL)
                              {
                              ret= -1;
                              goto end;
                              }
                        if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
                              {
                              ret= -1;
                              goto end;
                              }
                        s->init_buf=buf;
                        buf=NULL;
                        }

                  if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }

                  /* setup buffing BIO */
                  if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }

                  /* don't push the buffering BIO quite yet */

                  s->state=SSL3_ST_CW_CLNT_HELLO_A;
                  s->ctx->stats.sess_connect++;
                  s->init_num=0;
                  /* mark client_random uninitialized */
                  memset(s->s3->client_random,0,sizeof(s->s3->client_random));
                  s->d1->send_cookie = 0;
                  s->hit = 0;
                  break;

            case SSL3_ST_CW_CLNT_HELLO_A:
            case SSL3_ST_CW_CLNT_HELLO_B:

                  s->shutdown=0;

                  /* every DTLS ClientHello resets Finished MAC */
                  ssl3_init_finished_mac(s);

                  dtls1_start_timer(s);
                  ret=dtls1_client_hello(s);
                  if (ret <= 0) goto end;

                  if ( s->d1->send_cookie)
                        {
                        s->state=SSL3_ST_CW_FLUSH;
                        s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
                        }
                  else
                        s->state=SSL3_ST_CR_SRVR_HELLO_A;

                  s->init_num=0;

                  /* turn on buffering for the next lot of output */
                  if (s->bbio != s->wbio)
                        s->wbio=BIO_push(s->bbio,s->wbio);

                  break;

            case SSL3_ST_CR_SRVR_HELLO_A:
            case SSL3_ST_CR_SRVR_HELLO_B:
                  ret=ssl3_get_server_hello(s);
                  if (ret <= 0) goto end;
                  else
                        {
                        dtls1_stop_timer(s);
                        if (s->hit)
                              s->state=SSL3_ST_CR_FINISHED_A;
                        else
                              s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
                        }
                  s->init_num=0;
                  break;

            case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
            case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:

                  ret = dtls1_get_hello_verify(s);
                  if ( ret <= 0)
                        goto end;
                  dtls1_stop_timer(s);
                  if ( s->d1->send_cookie) /* start again, with a cookie */
                        s->state=SSL3_ST_CW_CLNT_HELLO_A;
                  else
                        s->state = SSL3_ST_CR_CERT_A;
                  s->init_num = 0;
                  break;

            case SSL3_ST_CR_CERT_A:
            case SSL3_ST_CR_CERT_B:
#ifndef OPENSSL_NO_TLSEXT
                  ret=ssl3_check_finished(s);
                  if (ret <= 0) goto end;
                  if (ret == 2)
                        {
                        s->hit = 1;
                        if (s->tlsext_ticket_expected)
                              s->state=SSL3_ST_CR_SESSION_TICKET_A;
                        else
                              s->state=SSL3_ST_CR_FINISHED_A;
                        s->init_num=0;
                        break;
                        }
#endif
                  /* Check if it is anon DH */
                  if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
                        {
                        ret=ssl3_get_server_certificate(s);
                        if (ret <= 0) goto end;
#ifndef OPENSSL_NO_TLSEXT
                        if (s->tlsext_status_expected)
                              s->state=SSL3_ST_CR_CERT_STATUS_A;
                        else
                              s->state=SSL3_ST_CR_KEY_EXCH_A;
                        }
                  else
                        {
                        skip = 1;
                        s->state=SSL3_ST_CR_KEY_EXCH_A;
                        }
#else
                        }
                  else
                        skip=1;

                  s->state=SSL3_ST_CR_KEY_EXCH_A;
#endif
                  s->init_num=0;
                  break;

            case SSL3_ST_CR_KEY_EXCH_A:
            case SSL3_ST_CR_KEY_EXCH_B:
                  ret=ssl3_get_key_exchange(s);
                  if (ret <= 0) goto end;
                  s->state=SSL3_ST_CR_CERT_REQ_A;
                  s->init_num=0;

                  /* at this point we check that we have the
                   * required stuff from the server */
                  if (!ssl3_check_cert_and_algorithm(s))
                        {
                        ret= -1;
                        goto end;
                        }
                  break;

            case SSL3_ST_CR_CERT_REQ_A:
            case SSL3_ST_CR_CERT_REQ_B:
                  ret=ssl3_get_certificate_request(s);
                  if (ret <= 0) goto end;
                  s->state=SSL3_ST_CR_SRVR_DONE_A;
                  s->init_num=0;
                  break;

            case SSL3_ST_CR_SRVR_DONE_A:
            case SSL3_ST_CR_SRVR_DONE_B:
                  ret=ssl3_get_server_done(s);
                  if (ret <= 0) goto end;
                  if (s->s3->tmp.cert_req)
                        s->state=SSL3_ST_CW_CERT_A;
                  else
                        s->state=SSL3_ST_CW_KEY_EXCH_A;
                  s->init_num=0;

                  break;

            case SSL3_ST_CW_CERT_A:
            case SSL3_ST_CW_CERT_B:
            case SSL3_ST_CW_CERT_C:
            case SSL3_ST_CW_CERT_D:
                  dtls1_start_timer(s);
                  ret=dtls1_send_client_certificate(s);
                  if (ret <= 0) goto end;
                  s->state=SSL3_ST_CW_KEY_EXCH_A;
                  s->init_num=0;
                  break;

            case SSL3_ST_CW_KEY_EXCH_A:
            case SSL3_ST_CW_KEY_EXCH_B:
                  dtls1_start_timer(s);
                  ret=dtls1_send_client_key_exchange(s);
                  if (ret <= 0) goto end;
                  l=s->s3->tmp.new_cipher->algorithms;
                  /* EAY EAY EAY need to check for DH fix cert
                   * sent back */
                  /* For TLS, cert_req is set to 2, so a cert chain
                   * of nothing is sent, but no verify packet is sent */
                  if (s->s3->tmp.cert_req == 1)
                        {
                        s->state=SSL3_ST_CW_CERT_VRFY_A;
                        }
                  else
                        {
                        s->state=SSL3_ST_CW_CHANGE_A;
                        s->s3->change_cipher_spec=0;
                        }

                  s->init_num=0;
                  break;

            case SSL3_ST_CW_CERT_VRFY_A:
            case SSL3_ST_CW_CERT_VRFY_B:
                  dtls1_start_timer(s);
                  ret=dtls1_send_client_verify(s);
                  if (ret <= 0) goto end;
                  s->state=SSL3_ST_CW_CHANGE_A;
                  s->init_num=0;
                  s->s3->change_cipher_spec=0;
                  break;

            case SSL3_ST_CW_CHANGE_A:
            case SSL3_ST_CW_CHANGE_B:
                  dtls1_start_timer(s);
                  ret=dtls1_send_change_cipher_spec(s,
                        SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
                  if (ret <= 0) goto end;
                  s->state=SSL3_ST_CW_FINISHED_A;
                  s->init_num=0;

                  s->session->cipher=s->s3->tmp.new_cipher;
#ifdef OPENSSL_NO_COMP
                  s->session->compress_meth=0;
#else
                  if (s->s3->tmp.new_compression == NULL)
                        s->session->compress_meth=0;
                  else
                        s->session->compress_meth=
                              s->s3->tmp.new_compression->id;
#endif
                  if (!s->method->ssl3_enc->setup_key_block(s))
                        {
                        ret= -1;
                        goto end;
                        }

                  if (!s->method->ssl3_enc->change_cipher_state(s,
                        SSL3_CHANGE_CIPHER_CLIENT_WRITE))
                        {
                        ret= -1;
                        goto end;
                        }
                  
                  dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
                  break;

            case SSL3_ST_CW_FINISHED_A:
            case SSL3_ST_CW_FINISHED_B:
                  dtls1_start_timer(s);
                  ret=dtls1_send_finished(s,
                        SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
                        s->method->ssl3_enc->client_finished_label,
                        s->method->ssl3_enc->client_finished_label_len);
                  if (ret <= 0) goto end;
                  s->state=SSL3_ST_CW_FLUSH;

                  /* clear flags */
                  s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
                  if (s->hit)
                        {
                        s->s3->tmp.next_state=SSL_ST_OK;
                        if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
                              {
                              s->state=SSL_ST_OK;
                              s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
                              s->s3->delay_buf_pop_ret=0;
                              }
                        }
                  else
                        {
#ifndef OPENSSL_NO_TLSEXT
                        /* Allow NewSessionTicket if ticket expected */
                        if (s->tlsext_ticket_expected)
                              s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
                        else
#endif
                        
                        s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
                        }
                  s->init_num=0;

                  break;

#ifndef OPENSSL_NO_TLSEXT
            case SSL3_ST_CR_SESSION_TICKET_A:
            case SSL3_ST_CR_SESSION_TICKET_B:
                  ret=ssl3_get_new_session_ticket(s);
                  if (ret <= 0) goto end;
                  s->state=SSL3_ST_CR_FINISHED_A;
                  s->init_num=0;
            break;

            case SSL3_ST_CR_CERT_STATUS_A:
            case SSL3_ST_CR_CERT_STATUS_B:
                  ret=ssl3_get_cert_status(s);
                  if (ret <= 0) goto end;
                  s->state=SSL3_ST_CR_KEY_EXCH_A;
                  s->init_num=0;
            break;
#endif

            case SSL3_ST_CR_FINISHED_A:
            case SSL3_ST_CR_FINISHED_B:
                  s->d1->change_cipher_spec_ok = 1;
                  ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
                        SSL3_ST_CR_FINISHED_B);
                  if (ret <= 0) goto end;
                  dtls1_stop_timer(s);

                  if (s->hit)
                        s->state=SSL3_ST_CW_CHANGE_A;
                  else
                        s->state=SSL_ST_OK;
                  s->init_num=0;
                  break;

            case SSL3_ST_CW_FLUSH:
                  s->rwstate=SSL_WRITING;
                  if (BIO_flush(s->wbio) <= 0)
                        {
                        ret= -1;
                        goto end;
                        }
                  s->rwstate=SSL_NOTHING;
                  s->state=s->s3->tmp.next_state;
                  break;

            case SSL_ST_OK:
                  /* clean a few things up */
                  ssl3_cleanup_key_block(s);

#if 0
                  if (s->init_buf != NULL)
                        {
                        BUF_MEM_free(s->init_buf);
                        s->init_buf=NULL;
                        }
#endif

                  /* If we are not 'joining' the last two packets,
                   * remove the buffering now */
                  if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
                        ssl_free_wbio_buffer(s);
                  /* else do it later in ssl3_write */

                  s->init_num=0;
                  s->new_session=0;

                  ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
                  if (s->hit) s->ctx->stats.sess_hit++;

                  ret=1;
                  /* s->server=0; */
                  s->handshake_func=dtls1_connect;
                  s->ctx->stats.sess_connect_good++;

                  if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);

                  /* done with handshaking */
                  s->d1->handshake_read_seq  = 0;
                  s->d1->next_handshake_write_seq = 0;
                  goto end;
                  /* break; */
                  
            default:
                  SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
                  ret= -1;
                  goto end;
                  /* break; */
                  }

            /* did we do anything */
            if (!s->s3->tmp.reuse_message && !skip)
                  {
                  if (s->debug)
                        {
                        if ((ret=BIO_flush(s->wbio)) <= 0)
                              goto end;
                        }

                  if ((cb != NULL) && (s->state != state))
                        {
                        new_state=s->state;
                        s->state=state;
                        cb(s,SSL_CB_CONNECT_LOOP,1);
                        s->state=new_state;
                        }
                  }
            skip=0;
            }
end:
      s->in_handshake--;
      if (buf != NULL)
            BUF_MEM_free(buf);
      if (cb != NULL)
            cb(s,SSL_CB_CONNECT_EXIT,ret);
      return(ret);
      }

int dtls1_client_hello(SSL *s)
      {
      unsigned char *buf;
      unsigned char *p,*d;
      unsigned int i,j;
      unsigned long Time,l;
      SSL_COMP *comp;

      buf=(unsigned char *)s->init_buf->data;
      if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
            {
            SSL_SESSION *sess = s->session;
            if ((s->session == NULL) ||
                  (s->session->ssl_version != s->version) ||
#ifdef OPENSSL_NO_TLSEXT
                  !sess->session_id_length ||
#else
                  (!sess->session_id_length && !sess->tlsext_tick) ||
#endif
                  (s->session->not_resumable))
                  {
                  if (!ssl_get_new_session(s,0))
                        goto err;
                  }
            /* else use the pre-loaded session */

            p=s->s3->client_random;
            /* if client_random is initialized, reuse it, we are
             * required to use same upon reply to HelloVerify */
            for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
            if (i==sizeof(s->s3->client_random))
                  {
                  Time=(unsigned long)time(NULL);     /* Time */
                  l2n(Time,p);
                  RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
                  }

            /* Do the message type and length last */
            d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);

            *(p++)=s->version>>8;
            *(p++)=s->version&0xff;
            s->client_version=s->version;

            /* Random stuff */
            memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
            p+=SSL3_RANDOM_SIZE;

            /* Session ID */
            if (s->new_session)
                  i=0;
            else
                  i=s->session->session_id_length;
            *(p++)=i;
            if (i != 0)
                  {
                  if (i > sizeof s->session->session_id)
                        {
                        SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
                        goto err;
                        }
                  memcpy(p,s->session->session_id,i);
                  p+=i;
                  }
            
            /* cookie stuff */
            if ( s->d1->cookie_len > sizeof(s->d1->cookie))
                  {
                  SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
                  goto err;
                  }
            *(p++) = s->d1->cookie_len;
            memcpy(p, s->d1->cookie, s->d1->cookie_len);
            p += s->d1->cookie_len;

            /* Ciphers supported */
            i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
            if (i == 0)
                  {
                  SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
                  goto err;
                  }
            s2n(i,p);
            p+=i;

            /* COMPRESSION */
            if (s->ctx->comp_methods == NULL)
                  j=0;
            else
                  j=sk_SSL_COMP_num(s->ctx->comp_methods);
            *(p++)=1+j;
            for (i=0; i<j; i++)
                  {
                  comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
                  *(p++)=comp->id;
                  }
            *(p++)=0; /* Add the NULL method */

#ifndef OPENSSL_NO_TLSEXT
            if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
                  {
                  SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
                  goto err;
                  }
#endif            

            l=(p-d);
            d=buf;

            d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);

            s->state=SSL3_ST_CW_CLNT_HELLO_B;
            /* number of bytes to write */
            s->init_num=p-buf;
            s->init_off=0;

            /* buffer the message to handle re-xmits */
            dtls1_buffer_message(s, 0);
            }

      /* SSL3_ST_CW_CLNT_HELLO_B */
      return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
err:
      return(-1);
      }

static int dtls1_get_hello_verify(SSL *s)
      {
      int n, al, ok = 0;
      unsigned char *data;
      unsigned int cookie_len;

      n=s->method->ssl_get_message(s,
            DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
            DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
            -1,
            s->max_cert_list,
            &ok);

      if (!ok) return((int)n);

      if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
            {
            s->d1->send_cookie = 0;
            s->s3->tmp.reuse_message=1;
            return(1);
            }

      data = (unsigned char *)s->init_msg;

      if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
            {
            SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
            s->version=(s->version&0xff00)|data[1];
            al = SSL_AD_PROTOCOL_VERSION;
            goto f_err;
            }
      data+=2;

      cookie_len = *(data++);
      if ( cookie_len > sizeof(s->d1->cookie))
            {
            al=SSL_AD_ILLEGAL_PARAMETER;
            goto f_err;
            }

      memcpy(s->d1->cookie, data, cookie_len);
      s->d1->cookie_len = cookie_len;

      s->d1->send_cookie = 1;
      return 1;

f_err:
      ssl3_send_alert(s, SSL3_AL_FATAL, al);
      return -1;
      }

int dtls1_send_client_key_exchange(SSL *s)
      {
      unsigned char *p,*d;
      int n;
      unsigned long l;
#ifndef OPENSSL_NO_RSA
      unsigned char *q;
      EVP_PKEY *pkey=NULL;
#endif
#ifndef OPENSSL_NO_KRB5
        KSSL_ERR kssl_err;
#endif /* OPENSSL_NO_KRB5 */

      if (s->state == SSL3_ST_CW_KEY_EXCH_A)
            {
            d=(unsigned char *)s->init_buf->data;
            p= &(d[DTLS1_HM_HEADER_LENGTH]);

            l=s->s3->tmp.new_cipher->algorithms;

                /* Fool emacs indentation */
                if (0) {}
#ifndef OPENSSL_NO_RSA
            else if (l & SSL_kRSA)
                  {
                  RSA *rsa;
                  unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];

                  if (s->session->sess_cert->peer_rsa_tmp != NULL)
                        rsa=s->session->sess_cert->peer_rsa_tmp;
                  else
                        {
                        pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
                        if ((pkey == NULL) ||
                              (pkey->type != EVP_PKEY_RSA) ||
                              (pkey->pkey.rsa == NULL))
                              {
                              SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
                              goto err;
                              }
                        rsa=pkey->pkey.rsa;
                        EVP_PKEY_free(pkey);
                        }
                        
                  tmp_buf[0]=s->client_version>>8;
                  tmp_buf[1]=s->client_version&0xff;
                  if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
                              goto err;

                  s->session->master_key_length=sizeof tmp_buf;

                  q=p;
                  /* Fix buf for TLS and [incidentally] DTLS */
                  if (s->version > SSL3_VERSION)
                        p+=2;
                  n=RSA_public_encrypt(sizeof tmp_buf,
                        tmp_buf,p,rsa,RSA_PKCS1_PADDING);
#ifdef PKCS1_CHECK
                  if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
                  if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
#endif
                  if (n <= 0)
                        {
                        SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
                        goto err;
                        }

                  /* Fix buf for TLS and [incidentally] DTLS */
                  if (s->version > SSL3_VERSION)
                        {
                        s2n(n,q);
                        n+=2;
                        }

                  s->session->master_key_length=
                        s->method->ssl3_enc->generate_master_secret(s,
                              s->session->master_key,
                              tmp_buf,sizeof tmp_buf);
                  OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
                  }
#endif
#ifndef OPENSSL_NO_KRB5
            else if (l & SSL_kKRB5)
                        {
                        krb5_error_code   krb5rc;
                        KSSL_CTX    *kssl_ctx = s->kssl_ctx;
                        /*  krb5_data     krb5_ap_req;  */
                        krb5_data   *enc_ticket;
                        krb5_data   authenticator, *authp = NULL;
                  EVP_CIPHER_CTX    ciph_ctx;
                  EVP_CIPHER  *enc = NULL;
                  unsigned char     iv[EVP_MAX_IV_LENGTH];
                  unsigned char     tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
                  unsigned char     epms[SSL_MAX_MASTER_KEY_LENGTH 
                                    + EVP_MAX_IV_LENGTH];
                  int         padl, outl = sizeof(epms);

                  EVP_CIPHER_CTX_init(&ciph_ctx);

#ifdef KSSL_DEBUG
                        printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
                                l, SSL_kKRB5);
#endif      /* KSSL_DEBUG */

                  authp = NULL;
#ifdef KRB5SENDAUTH
                  if (KRB5SENDAUTH)  authp = &authenticator;
#endif      /* KRB5SENDAUTH */

                        krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
                        &kssl_err);
                  enc = kssl_map_enc(kssl_ctx->enctype);
                        if (enc == NULL)
                            goto err;
#ifdef KSSL_DEBUG
                        {
                        printf("kssl_cget_tkt rtn %d\n", krb5rc);
                        if (krb5rc && kssl_err.text)
                    printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
                        }
#endif      /* KSSL_DEBUG */

                        if (krb5rc)
                                {
                                ssl3_send_alert(s,SSL3_AL_FATAL,
                                    SSL_AD_HANDSHAKE_FAILURE);
                                SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
                                    kssl_err.reason);
                                goto err;
                                }

                  /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
                  **  in place of RFC 2712 KerberosWrapper, as in:
                  **
                        **  Send ticket (copy to *p, set n = length)
                        **  n = krb5_ap_req.length;
                        **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
                        **  if (krb5_ap_req.data)  
                        **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
                        **
                  **  Now using real RFC 2712 KerberosWrapper
                  **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
                  **  Note: 2712 "opaque" types are here replaced
                  **  with a 2-byte length followed by the value.
                  **  Example:
                  **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
                  **  Where "xx xx" = length bytes.  Shown here with
                  **  optional authenticator omitted.
                  */

                  /*  KerberosWrapper.Ticket          */
                  s2n(enc_ticket->length,p);
                  memcpy(p, enc_ticket->data, enc_ticket->length);
                  p+= enc_ticket->length;
                  n = enc_ticket->length + 2;

                  /*  KerberosWrapper.Authenticator   */
                  if (authp  &&  authp->length)  
                        {
                        s2n(authp->length,p);
                        memcpy(p, authp->data, authp->length);
                        p+= authp->length;
                        n+= authp->length + 2;
                        
                        free(authp->data);
                        authp->data = NULL;
                        authp->length = 0;
                        }
                  else
                        {
                        s2n(0,p);/*  null authenticator length    */
                        n+=2;
                        }
 
                  if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
                      goto err;

                  /*  20010420 VRS.  Tried it this way; failed.
                  **    EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
                  **    EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
                  **                      kssl_ctx->length);
                  **    EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
                  */

                  memset(iv, 0, sizeof iv);  /* per RFC 1510 */
                  EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
                        kssl_ctx->key,iv);
                  EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
                        sizeof tmp_buf);
                  EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
                  outl += padl;
                  if (outl > sizeof epms)
                        {
                        SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
                        goto err;
                        }
                  EVP_CIPHER_CTX_cleanup(&ciph_ctx);

                  /*  KerberosWrapper.EncryptedPreMasterSecret    */
                  s2n(outl,p);
                  memcpy(p, epms, outl);
                  p+=outl;
                  n+=outl + 2;

                        s->session->master_key_length=
                                s->method->ssl3_enc->generate_master_secret(s,
                              s->session->master_key,
                              tmp_buf, sizeof tmp_buf);

                  OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
                  OPENSSL_cleanse(epms, outl);
                        }
#endif
#ifndef OPENSSL_NO_DH
            else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
                  {
                  DH *dh_srvr,*dh_clnt;

                  if (s->session->sess_cert->peer_dh_tmp != NULL)
                        dh_srvr=s->session->sess_cert->peer_dh_tmp;
                  else
                        {
                        /* we get them from the cert */
                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
                        SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
                        goto err;
                        }
                  
                  /* generate a new random key */
                  if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
                        {
                        SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
                        goto err;
                        }
                  if (!DH_generate_key(dh_clnt))
                        {
                        SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
                        goto err;
                        }

                  /* use the 'p' output buffer for the DH key, but
                   * make sure to clear it out afterwards */

                  n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);

                  if (n <= 0)
                        {
                        SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
                        goto err;
                        }

                  /* generate master key from the result */
                  s->session->master_key_length=
                        s->method->ssl3_enc->generate_master_secret(s,
                              s->session->master_key,p,n);
                  /* clean up */
                  memset(p,0,n);

                  /* send off the data */
                  n=BN_num_bytes(dh_clnt->pub_key);
                  s2n(n,p);
                  BN_bn2bin(dh_clnt->pub_key,p);
                  n+=2;

                  DH_free(dh_clnt);

                  /* perhaps clean things up a bit EAY EAY EAY EAY*/
                  }
#endif
            else
                  {
                  ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
                  SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
                  goto err;
                  }
            
            d = dtls1_set_message_header(s, d,
            SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
            /*
             *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
             l2n3(n,d);
             l2n(s->d1->handshake_write_seq,d);
             s->d1->handshake_write_seq++;
            */
            
            s->state=SSL3_ST_CW_KEY_EXCH_B;
            /* number of bytes to write */
            s->init_num=n+DTLS1_HM_HEADER_LENGTH;
            s->init_off=0;

            /* buffer the message to handle re-xmits */
            dtls1_buffer_message(s, 0);
            }
      
      /* SSL3_ST_CW_KEY_EXCH_B */
      return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
err:
      return(-1);
      }

int dtls1_send_client_verify(SSL *s)
      {
      unsigned char *p,*d;
      unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
      EVP_PKEY *pkey;
#ifndef OPENSSL_NO_RSA
      unsigned u=0;
#endif
      unsigned long n;
#ifndef OPENSSL_NO_DSA
      int j;
#endif

      if (s->state == SSL3_ST_CW_CERT_VRFY_A)
            {
            d=(unsigned char *)s->init_buf->data;
            p= &(d[DTLS1_HM_HEADER_LENGTH]);
            pkey=s->cert->key->privatekey;

            s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
                  &(data[MD5_DIGEST_LENGTH]));

#ifndef OPENSSL_NO_RSA
            if (pkey->type == EVP_PKEY_RSA)
                  {
                  s->method->ssl3_enc->cert_verify_mac(s,
                        &(s->s3->finish_dgst1),&(data[0]));
                  if (RSA_sign(NID_md5_sha1, data,
                               MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
                              &(p[2]), &u, pkey->pkey.rsa) <= 0 )
                        {
                        SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
                        goto err;
                        }
                  s2n(u,p);
                  n=u+2;
                  }
            else
#endif
#ifndef OPENSSL_NO_DSA
                  if (pkey->type == EVP_PKEY_DSA)
                  {
                  if (!DSA_sign(pkey->save_type,
                        &(data[MD5_DIGEST_LENGTH]),
                        SHA_DIGEST_LENGTH,&(p[2]),
                        (unsigned int *)&j,pkey->pkey.dsa))
                        {
                        SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
                        goto err;
                        }
                  s2n(j,p);
                  n=j+2;
                  }
            else
#endif
                  {
                  SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
                  goto err;
                  }

            d = dtls1_set_message_header(s, d,
                  SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;

            s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
            s->init_off=0;

            /* buffer the message to handle re-xmits */
            dtls1_buffer_message(s, 0);

            s->state = SSL3_ST_CW_CERT_VRFY_B;
            }

      /* s->state = SSL3_ST_CW_CERT_VRFY_B */
      return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
err:
      return(-1);
      }

int dtls1_send_client_certificate(SSL *s)
      {
      X509 *x509=NULL;
      EVP_PKEY *pkey=NULL;
      int i;
      unsigned long l;

      if (s->state ==   SSL3_ST_CW_CERT_A)
            {
            if ((s->cert == NULL) ||
                  (s->cert->key->x509 == NULL) ||
                  (s->cert->key->privatekey == NULL))
                  s->state=SSL3_ST_CW_CERT_B;
            else
                  s->state=SSL3_ST_CW_CERT_C;
            }

      /* We need to get a client cert */
      if (s->state == SSL3_ST_CW_CERT_B)
            {
            /* If we get an error, we need to
             * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
             * We then get retied later */
            i=0;
            i = ssl_do_client_cert_cb(s, &x509, &pkey);
            if (i < 0)
                  {
                  s->rwstate=SSL_X509_LOOKUP;
                  return(-1);
                  }
            s->rwstate=SSL_NOTHING;
            if ((i == 1) && (pkey != NULL) && (x509 != NULL))
                  {
                  s->state=SSL3_ST_CW_CERT_B;
                  if (  !SSL_use_certificate(s,x509) ||
                        !SSL_use_PrivateKey(s,pkey))
                        i=0;
                  }
            else if (i == 1)
                  {
                  i=0;
                  SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
                  }

            if (x509 != NULL) X509_free(x509);
            if (pkey != NULL) EVP_PKEY_free(pkey);
            if (i == 0)
                  {
                  if (s->version == SSL3_VERSION)
                        {
                        s->s3->tmp.cert_req=0;
                        ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
                        return(1);
                        }
                  else
                        {
                        s->s3->tmp.cert_req=2;
                        }
                  }

            /* Ok, we have a cert */
            s->state=SSL3_ST_CW_CERT_C;
            }

      if (s->state == SSL3_ST_CW_CERT_C)
            {
            s->state=SSL3_ST_CW_CERT_D;
            l=dtls1_output_cert_chain(s,
                  (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
            s->init_num=(int)l;
            s->init_off=0;

            /* set header called by dtls1_output_cert_chain() */

            /* buffer the message to handle re-xmits */
            dtls1_buffer_message(s, 0);
            }
      /* SSL3_ST_CW_CERT_D */
      return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
      }



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