ssl/s3_both.c

   1 /* ssl/s3_both.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include <string.h>
 113 #include <stdio.h>
 114 #include <openssl/buffer.h>
 115 #include <openssl/rand.h>
 116 #include <openssl/objects.h>
 117 #include <openssl/evp.h>
 118 #include <openssl/x509.h>
 119 #include "ssl_locl.h"
 120
 121 /* send s->init_buf in records of type 'type' */
 122 int ssl3_do_write(SSL *s, int type)
 123         {
 124         int ret;
 125
 126         ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off],
 127                              s->init_num);
 128         if (ret < 0) return(-1);
 129         if (type == SSL3_RT_HANDSHAKE)
 130                 /* should not be done for 'Hello Request's, but in that case
 131                  * we'll ignore the result anyway */
 132                 ssl3_finish_mac(s,(unsigned char *)&s->init_buf->data[s->init_off],ret);
 133
 134         if (ret == s->init_num)
 135                 return(1);
 136         s->init_off+=ret;
 137         s->init_num-=ret;
 138         return(0);
 139         }
 140
 141 int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
 142         {
 143         unsigned char *p,*d;
 144         int i;
 145         unsigned long l;
 146
 147         if (s->state == a)
 148                 {
 149                 d=(unsigned char *)s->init_buf->data;
 150                 p= &(d[4]);
 151
 152                 i=s->method->ssl3_enc->final_finish_mac(s,
 153                         &(s->s3->finish_dgst1),
 154                         &(s->s3->finish_dgst2),
 155                         sender,slen,s->s3->tmp.finish_md);
 156                 s->s3->tmp.finish_md_len = i;
 157                 memcpy(p, s->s3->tmp.finish_md, i);
 158                 p+=i;
 159                 l=i;
 160
 161 #ifdef OPENSSL_SYS_WIN16
 162                 /* MSVC 1.5 does not clear the top bytes of the word unless
 163                  * I do this.
 164                  */
 165                 l&=0xffff;
 166 #endif
 167
 168                 *(d++)=SSL3_MT_FINISHED;
 169                 l2n3(l,d);
 170                 s->init_num=(int)l+4;
 171                 s->init_off=0;
 172
 173                 s->state=b;
 174                 }
 175
 176         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
 177         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 178         }
 179
 180 int ssl3_get_finished(SSL *s, int a, int b)
 181         {
 182         int al,i,ok;
 183         long n;
 184         unsigned char *p;
 185
 186         /* the mac has already been generated when we received the
 187          * change cipher spec message and is in s->s3->tmp.peer_finish_md
 188          */
 189
 190         n=ssl3_get_message(s,
 191                 a,
 192                 b,
 193                 SSL3_MT_FINISHED,
 194                 64, /* should actually be 36+4 :-) */
 195                 &ok);
 196
 197         if (!ok) return((int)n);
 198
 199         /* If this occurs, we have missed a message */
 200         if (!s->s3->change_cipher_spec)
 201                 {
 202                 al=SSL_AD_UNEXPECTED_MESSAGE;
 203                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
 204                 goto f_err;
 205                 }
 206         s->s3->change_cipher_spec=0;
 207
 208         p = (unsigned char *)s->init_buf->data;
 209         i = s->s3->tmp.peer_finish_md_len;
 210
 211         if (i != n)
 212                 {
 213                 al=SSL_AD_DECODE_ERROR;
 214                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
 215                 goto f_err;
 216                 }
 217
 218         if (memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
 219                 {
 220                 al=SSL_AD_DECRYPT_ERROR;
 221                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
 222                 goto f_err;
 223                 }
 224
 225         return(1);
 226 f_err:
 227         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 228         return(0);
 229         }
 230
 231 /* for these 2 messages, we need to
 232  * ssl->enc_read_ctx                    re-init
 233  * ssl->s3->read_sequence               zero
 234  * ssl->s3->read_mac_secret             re-init
 235  * ssl->session->read_sym_enc           assign
 236  * ssl->session->read_compression       assign
 237  * ssl->session->read_hash              assign
 238  */
 239 int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
 240         {
 241         unsigned char *p;
 242
 243         if (s->state == a)
 244                 {
 245                 p=(unsigned char *)s->init_buf->data;
 246                 *p=SSL3_MT_CCS;
 247                 s->init_num=1;
 248                 s->init_off=0;
 249
 250                 s->state=b;
 251                 }
 252
 253         /* SSL3_ST_CW_CHANGE_B */
 254         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
 255         }
 256
 257 unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
 258         {
 259         unsigned char *p;
 260         int n,i;
 261         unsigned long l=7;
 262         BUF_MEM *buf;
 263         X509_STORE_CTX xs_ctx;
 264         X509_OBJECT obj;
 265
 266         /* TLSv1 sends a chain with nothing in it, instead of an alert */
 267         buf=s->init_buf;
 268         if (!BUF_MEM_grow(buf,(int)(10)))
 269                 {
 270                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 271                 return(0);
 272                 }
 273         if (x != NULL)
 274                 {
 275                 if(!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL))
 276                         {
 277                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);
 278                         return(0);
 279                         }
 280
 281                 for (;;)
 282                         {
 283                         n=i2d_X509(x,NULL);
 284                         if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 285                                 {
 286                                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 287                                 return(0);
 288                                 }
 289                         p=(unsigned char *)&(buf->data[l]);
 290                         l2n3(n,p);
 291                         i2d_X509(x,&p);
 292                         l+=n+3;
 293                         if (X509_NAME_cmp(X509_get_subject_name(x),
 294                                 X509_get_issuer_name(x)) == 0) break;
 295
 296                         i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
 297                                 X509_get_issuer_name(x),&obj);
 298                         if (i <= 0) break;
 299                         x=obj.data.x509;
 300                         /* Count is one too high since the X509_STORE_get uped the
 301                          * ref count */
 302                         X509_free(x);
 303                         }
 304
 305                 X509_STORE_CTX_cleanup(&xs_ctx);
 306                 }
 307
 308         /* Thawte special :-) */
 309         if (s->ctx->extra_certs != NULL)
 310         for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
 311                 {
 312                 x=sk_X509_value(s->ctx->extra_certs,i);
 313                 n=i2d_X509(x,NULL);
 314                 if (!BUF_MEM_grow(buf,(int)(n+l+3)))
 315                         {
 316                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 317                         return(0);
 318                         }
 319                 p=(unsigned char *)&(buf->data[l]);
 320                 l2n3(n,p);
 321                 i2d_X509(x,&p);
 322                 l+=n+3;
 323                 }
 324
 325         l-=7;
 326         p=(unsigned char *)&(buf->data[4]);
 327         l2n3(l,p);
 328         l+=3;
 329         p=(unsigned char *)&(buf->data[0]);
 330         *(p++)=SSL3_MT_CERTIFICATE;
 331         l2n3(l,p);
 332         l+=4;
 333         return(l);
 334         }
 335
 336 /* Obtain handshake message of message type 'mt' (any if mt == -1),
 337  * maximum acceptable body length 'max'.
 338  * The first four bytes (msg_type and length) are read in state 'st1',
 339  * the body is read in state 'stn'.
 340  */
 341 long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
 342         {
 343         unsigned char *p;
 344         unsigned long l;
 345         long n;
 346         int i,al;
 347
 348         if (s->s3->tmp.reuse_message)
 349                 {
 350                 s->s3->tmp.reuse_message=0;
 351                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
 352                         {
 353                         al=SSL_AD_UNEXPECTED_MESSAGE;
 354                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 355                         goto f_err;
 356                         }
 357                 *ok=1;
 358                 return((int)s->s3->tmp.message_size);
 359                 }
 360
 361         p=(unsigned char *)s->init_buf->data;
 362
 363         if (s->state == st1) /* s->init_num < 4 */
 364                 {
 365                 int skip_message;
 366
 367                 do
 368                         {
 369                         while (s->init_num < 4)
 370                                 {
 371                                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],
 372                                         4 - s->init_num, 0);
 373                                 if (i <= 0)
 374                                         {
 375                                         s->rwstate=SSL_READING;
 376                                         *ok = 0;
 377                                         return i;
 378                                         }
 379                                 s->init_num+=i;
 380                                 }
 381
 382                         skip_message = 0;
 383                         if (!s->server)
 384                                 if (p[0] == SSL3_MT_HELLO_REQUEST)
 385                                         /* The server may always send 'Hello Request' messages --
 386                                          * we are doing a handshake anyway now, so ignore them
 387                                          * if their format is correct. Does not count for
 388                                          * 'Finished' MAC. */
 389                                         if (p[1] == 0 && p[2] == 0 &&p[3] == 0)
 390                                                 skip_message = 1;
 391                         }
 392                 while (skip_message);
 393
 394                 /* s->init_num == 4 */
 395
 396                 if ((mt >= 0) && (*p != mt))
 397                         {
 398                         al=SSL_AD_UNEXPECTED_MESSAGE;
 399                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 400                         goto f_err;
 401                         }
 402                 if ((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
 403                                         (st1 == SSL3_ST_SR_CERT_A) &&
 404                                         (stn == SSL3_ST_SR_CERT_B))
 405                         {
 406                         /* At this point we have got an MS SGC second client
 407                          * hello (maybe we should always allow the client to
 408                          * start a new handshake?). We need to restart the mac.
 409                          * Don't increment {num,total}_renegotiations because
 410                          * we have not completed the handshake. */
 411                         ssl3_init_finished_mac(s);
 412                         }
 413
 414                 ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, 4);
 415
 416                 s->s3->tmp.message_type= *(p++);
 417
 418                 n2l3(p,l);
 419                 if (l > (unsigned long)max)
 420                         {
 421                         al=SSL_AD_ILLEGAL_PARAMETER;
 422                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
 423                         goto f_err;
 424                         }
 425                 if (l && !BUF_MEM_grow(s->init_buf,(int)l))
 426                         {
 427                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
 428                         goto err;
 429                         }
 430                 s->s3->tmp.message_size=l;
 431                 s->state=stn;
 432
 433                 s->init_num=0;
 434                 }
 435
 436         /* next state (stn) */
 437         p=(unsigned char *)s->init_buf->data;
 438         n=s->s3->tmp.message_size;
 439         while (n > 0)
 440                 {
 441                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n,0);
 442                 if (i <= 0)
 443                         {
 444                         s->rwstate=SSL_READING;
 445                         *ok = 0;
 446                         return i;
 447                         }
 448                 s->init_num += i;
 449                 n -= i;
 450                 }
 451         ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num);
 452         *ok=1;
 453         return s->init_num;
 454 f_err:
 455         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 456 err:
 457         *ok=0;
 458         return(-1);
 459         }
 460
 461 int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
 462         {
 463         EVP_PKEY *pk;
 464         int ret= -1,i,j;
 465
 466         if (pkey == NULL)
 467                 pk=X509_get_pubkey(x);
 468         else
 469                 pk=pkey;
 470         if (pk == NULL) goto err;
 471
 472         i=pk->type;
 473         if (i == EVP_PKEY_RSA)
 474                 {
 475                 ret=SSL_PKEY_RSA_ENC;
 476                 if (x != NULL)
 477                         {
 478                         j=X509_get_ext_count(x);
 479                         /* check to see if this is a signing only certificate */
 480                         /* EAY EAY EAY EAY */
 481                         }
 482                 }
 483         else if (i == EVP_PKEY_DSA)
 484                 {
 485                 ret=SSL_PKEY_DSA_SIGN;
 486                 }
 487         else if (i == EVP_PKEY_DH)
 488                 {
 489                 /* if we just have a key, we needs to be guess */
 490
 491                 if (x == NULL)
 492                         ret=SSL_PKEY_DH_DSA;
 493                 else
 494                         {
 495                         j=X509_get_signature_type(x);
 496                         if (j == EVP_PKEY_RSA)
 497                                 ret=SSL_PKEY_DH_RSA;
 498                         else if (j== EVP_PKEY_DSA)
 499                                 ret=SSL_PKEY_DH_DSA;
 500                         else ret= -1;
 501                         }
 502                 }
 503         else
 504                 ret= -1;
 505
 506 err:
 507         if(!pkey) EVP_PKEY_free(pk);
 508         return(ret);
 509         }
 510
 511 int ssl_verify_alarm_type(long type)
 512         {
 513         int al;
 514
 515         switch(type)
 516                 {
 517         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
 518         case X509_V_ERR_UNABLE_TO_GET_CRL:
 519         case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
 520                 al=SSL_AD_UNKNOWN_CA;
 521                 break;
 522         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
 523         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
 524         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
 525         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
 526         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 527         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
 528         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
 529         case X509_V_ERR_CERT_NOT_YET_VALID:
 530         case X509_V_ERR_CRL_NOT_YET_VALID:
 531                 al=SSL_AD_BAD_CERTIFICATE;
 532                 break;
 533         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
 534         case X509_V_ERR_CRL_SIGNATURE_FAILURE:
 535                 al=SSL_AD_DECRYPT_ERROR;
 536                 break;
 537         case X509_V_ERR_CERT_HAS_EXPIRED:
 538         case X509_V_ERR_CRL_HAS_EXPIRED:
 539                 al=SSL_AD_CERTIFICATE_EXPIRED;
 540                 break;
 541         case X509_V_ERR_CERT_REVOKED:
 542                 al=SSL_AD_CERTIFICATE_REVOKED;
 543                 break;
 544         case X509_V_ERR_OUT_OF_MEM:
 545                 al=SSL_AD_INTERNAL_ERROR;
 546                 break;
 547         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 548         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
 549         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
 550         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
 551         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
 552                 al=SSL_AD_UNKNOWN_CA;
 553                 break;
 554         case X509_V_ERR_APPLICATION_VERIFICATION:
 555                 al=SSL_AD_HANDSHAKE_FAILURE;
 556                 break;
 557         default:
 558                 al=SSL_AD_CERTIFICATE_UNKNOWN;
 559                 break;
 560                 }
 561         return(al);
 562         }
 563
 564 int ssl3_setup_buffers(SSL *s)
 565         {
 566         unsigned char *p;
 567         unsigned int extra;
 568
 569         if (s->s3->rbuf.buf == NULL)
 570                 {
 571                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 572                         extra=SSL3_RT_MAX_EXTRA;
 573                 else
 574                         extra=0;
 575                 if ((p=OPENSSL_malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
 576                         == NULL)
 577                         goto err;
 578                 s->s3->rbuf.buf=p;
 579                 }
 580
 581         if (s->s3->wbuf.buf == NULL)
 582                 {
 583                 if ((p=OPENSSL_malloc(SSL3_RT_MAX_PACKET_SIZE))
 584                         == NULL)
 585                         goto err;
 586                 s->s3->wbuf.buf=p;
 587                 }
 588         s->packet= &(s->s3->rbuf.buf[0]);
 589         return(1);
 590 err:
 591         SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
 592         return(0);
 593         }