c69e8d230830ed35c86da181473b54774211bb0c
[openssl.git] / 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) 1998-2001 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 <limits.h>
113 #include <string.h>
114 #include <stdio.h>
115 #include <openssl/buffer.h>
116 #include <openssl/rand.h>
117 #include <openssl/objects.h>
118 #include <openssl/evp.h>
119 #include <openssl/x509.h>
120 #include "ssl_locl.h"
121
122 /* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
123 int ssl3_do_write(SSL *s, int type)
124         {
125         int ret;
126
127         ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off],
128                              s->init_num);
129         if (ret < 0) return(-1);
130         if (type == SSL3_RT_HANDSHAKE)
131                 /* should not be done for 'Hello Request's, but in that case
132                  * we'll ignore the result anyway */
133                 ssl3_finish_mac(s,(unsigned char *)&s->init_buf->data[s->init_off],ret);
134         
135         if (ret == s->init_num)
136                 {
137                 if (s->msg_callback)
138                         s->msg_callback(1, s->version, type, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg);
139                 return(1);
140                 }
141         s->init_off+=ret;
142         s->init_num-=ret;
143         return(0);
144         }
145
146 int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
147         {
148         unsigned char *p,*d;
149         int i;
150         unsigned long l;
151
152         if (s->state == a)
153                 {
154                 d=(unsigned char *)s->init_buf->data;
155                 p= &(d[4]);
156
157                 i=s->method->ssl3_enc->final_finish_mac(s,
158                         &(s->s3->finish_dgst1),
159                         &(s->s3->finish_dgst2),
160                         sender,slen,s->s3->tmp.finish_md);
161                 s->s3->tmp.finish_md_len = i;
162                 memcpy(p, s->s3->tmp.finish_md, i);
163                 p+=i;
164                 l=i;
165
166 #ifdef OPENSSL_SYS_WIN16
167                 /* MSVC 1.5 does not clear the top bytes of the word unless
168                  * I do this.
169                  */
170                 l&=0xffff;
171 #endif
172
173                 *(d++)=SSL3_MT_FINISHED;
174                 l2n3(l,d);
175                 s->init_num=(int)l+4;
176                 s->init_off=0;
177
178                 s->state=b;
179                 }
180
181         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
182         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
183         }
184
185 int ssl3_get_finished(SSL *s, int a, int b)
186         {
187         int al,i,ok;
188         long n;
189         unsigned char *p;
190
191         /* the mac has already been generated when we received the
192          * change cipher spec message and is in s->s3->tmp.peer_finish_md
193          */ 
194
195         n=ssl3_get_message(s,
196                 a,
197                 b,
198                 SSL3_MT_FINISHED,
199                 64, /* should actually be 36+4 :-) */
200                 &ok);
201
202         if (!ok) return((int)n);
203
204         /* If this occurs, we have missed a message */
205         if (!s->s3->change_cipher_spec)
206                 {
207                 al=SSL_AD_UNEXPECTED_MESSAGE;
208                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
209                 goto f_err;
210                 }
211         s->s3->change_cipher_spec=0;
212
213         p = (unsigned char *)s->init_msg;
214         i = s->s3->tmp.peer_finish_md_len;
215
216         if (i != n)
217                 {
218                 al=SSL_AD_DECODE_ERROR;
219                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
220                 goto f_err;
221                 }
222
223         if (memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
224                 {
225                 al=SSL_AD_DECRYPT_ERROR;
226                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
227                 goto f_err;
228                 }
229
230         return(1);
231 f_err:
232         ssl3_send_alert(s,SSL3_AL_FATAL,al);
233         return(0);
234         }
235
236 /* for these 2 messages, we need to
237  * ssl->enc_read_ctx                    re-init
238  * ssl->s3->read_sequence               zero
239  * ssl->s3->read_mac_secret             re-init
240  * ssl->session->read_sym_enc           assign
241  * ssl->session->read_compression       assign
242  * ssl->session->read_hash              assign
243  */
244 int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
245         { 
246         unsigned char *p;
247
248         if (s->state == a)
249                 {
250                 p=(unsigned char *)s->init_buf->data;
251                 *p=SSL3_MT_CCS;
252                 s->init_num=1;
253                 s->init_off=0;
254
255                 s->state=b;
256                 }
257
258         /* SSL3_ST_CW_CHANGE_B */
259         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
260         }
261
262 unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
263         {
264         unsigned char *p;
265         int n,i;
266         unsigned long l=7;
267         BUF_MEM *buf;
268         X509_STORE_CTX xs_ctx;
269         X509_OBJECT obj;
270
271         /* TLSv1 sends a chain with nothing in it, instead of an alert */
272         buf=s->init_buf;
273         if (!BUF_MEM_grow(buf,(int)(10)))
274                 {
275                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
276                 return(0);
277                 }
278         if (x != NULL)
279                 {
280                 if(!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL))
281                         {
282                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);
283                         return(0);
284                         }
285
286                 for (;;)
287                         {
288                         n=i2d_X509(x,NULL);
289                         if (!BUF_MEM_grow(buf,(int)(n+l+3)))
290                                 {
291                                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
292                                 return(0);
293                                 }
294                         p=(unsigned char *)&(buf->data[l]);
295                         l2n3(n,p);
296                         i2d_X509(x,&p);
297                         l+=n+3;
298                         if (X509_NAME_cmp(X509_get_subject_name(x),
299                                 X509_get_issuer_name(x)) == 0) break;
300
301                         i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
302                                 X509_get_issuer_name(x),&obj);
303                         if (i <= 0) break;
304                         x=obj.data.x509;
305                         /* Count is one too high since the X509_STORE_get uped the
306                          * ref count */
307                         X509_free(x);
308                         }
309
310                 X509_STORE_CTX_cleanup(&xs_ctx);
311                 }
312
313         /* Thawte special :-) */
314         if (s->ctx->extra_certs != NULL)
315         for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
316                 {
317                 x=sk_X509_value(s->ctx->extra_certs,i);
318                 n=i2d_X509(x,NULL);
319                 if (!BUF_MEM_grow(buf,(int)(n+l+3)))
320                         {
321                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
322                         return(0);
323                         }
324                 p=(unsigned char *)&(buf->data[l]);
325                 l2n3(n,p);
326                 i2d_X509(x,&p);
327                 l+=n+3;
328                 }
329
330         l-=7;
331         p=(unsigned char *)&(buf->data[4]);
332         l2n3(l,p);
333         l+=3;
334         p=(unsigned char *)&(buf->data[0]);
335         *(p++)=SSL3_MT_CERTIFICATE;
336         l2n3(l,p);
337         l+=4;
338         return(l);
339         }
340
341 /* Obtain handshake message of message type 'mt' (any if mt == -1),
342  * maximum acceptable body length 'max'.
343  * The first four bytes (msg_type and length) are read in state 'st1',
344  * the body is read in state 'stn'.
345  */
346 long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
347         {
348         unsigned char *p;
349         unsigned long l;
350         long n;
351         int i,al;
352
353         if (s->s3->tmp.reuse_message)
354                 {
355                 s->s3->tmp.reuse_message=0;
356                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
357                         {
358                         al=SSL_AD_UNEXPECTED_MESSAGE;
359                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
360                         goto f_err;
361                         }
362                 *ok=1;
363                 s->init_msg = s->init_buf->data + 4;
364                 s->init_num = (int)s->s3->tmp.message_size;
365                 return s->init_num;
366                 }
367
368         p=(unsigned char *)s->init_buf->data;
369
370         if (s->state == st1) /* s->init_num < 4 */
371                 {
372                 int skip_message;
373
374                 do
375                         {
376                         while (s->init_num < 4)
377                                 {
378                                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],
379                                         4 - s->init_num, 0);
380                                 if (i <= 0)
381                                         {
382                                         s->rwstate=SSL_READING;
383                                         *ok = 0;
384                                         return i;
385                                         }
386                                 s->init_num+=i;
387                                 }
388                         
389                         skip_message = 0;
390                         if (!s->server)
391                                 if (p[0] == SSL3_MT_HELLO_REQUEST)
392                                         /* The server may always send 'Hello Request' messages --
393                                          * we are doing a handshake anyway now, so ignore them
394                                          * if their format is correct. Does not count for
395                                          * 'Finished' MAC. */
396                                         if (p[1] == 0 && p[2] == 0 &&p[3] == 0)
397                                                 {
398                                                 s->init_num = 0;
399                                                 skip_message = 1;
400
401                                                 if (s->msg_callback)
402                                                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, 4, s, s->msg_callback_arg);
403                                                 }
404                         }
405                 while (skip_message);
406
407                 /* s->init_num == 4 */
408
409                 if ((mt >= 0) && (*p != mt))
410                         {
411                         al=SSL_AD_UNEXPECTED_MESSAGE;
412                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
413                         goto f_err;
414                         }
415                 if ((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
416                                         (st1 == SSL3_ST_SR_CERT_A) &&
417                                         (stn == SSL3_ST_SR_CERT_B))
418                         {
419                         /* At this point we have got an MS SGC second client
420                          * hello (maybe we should always allow the client to
421                          * start a new handshake?). We need to restart the mac.
422                          * Don't increment {num,total}_renegotiations because
423                          * we have not completed the handshake. */
424                         ssl3_init_finished_mac(s);
425                         }
426
427                 s->s3->tmp.message_type= *(p++);
428
429                 n2l3(p,l);
430                 if (l > (unsigned long)max)
431                         {
432                         al=SSL_AD_ILLEGAL_PARAMETER;
433                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
434                         goto f_err;
435                         }
436                 if (l > (INT_MAX-4)) /* BUF_MEM_grow takes an 'int' parameter */
437                         {
438                         al=SSL_AD_ILLEGAL_PARAMETER;
439                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
440                         goto f_err;
441                         }
442                 if (l && !BUF_MEM_grow(s->init_buf,(int)l+4))
443                         {
444                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
445                         goto err;
446                         }
447                 s->s3->tmp.message_size=l;
448                 s->state=stn;
449
450                 s->init_msg = s->init_buf->data + 4;
451                 s->init_num = 0;
452                 }
453
454         /* next state (stn) */
455         p = s->init_msg;
456         n = s->s3->tmp.message_size - s->init_num;
457         while (n > 0)
458                 {
459                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n,0);
460                 if (i <= 0)
461                         {
462                         s->rwstate=SSL_READING;
463                         *ok = 0;
464                         return i;
465                         }
466                 s->init_num += i;
467                 n -= i;
468                 }
469         ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4);
470         if (s->msg_callback)
471                 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, (size_t)s->init_num + 4, s, s->msg_callback_arg);
472         *ok=1;
473         return s->init_num;
474 f_err:
475         ssl3_send_alert(s,SSL3_AL_FATAL,al);
476 err:
477         *ok=0;
478         return(-1);
479         }
480
481 int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
482         {
483         EVP_PKEY *pk;
484         int ret= -1,i,j;
485
486         if (pkey == NULL)
487                 pk=X509_get_pubkey(x);
488         else
489                 pk=pkey;
490         if (pk == NULL) goto err;
491
492         i=pk->type;
493         if (i == EVP_PKEY_RSA)
494                 {
495                 ret=SSL_PKEY_RSA_ENC;
496                 if (x != NULL)
497                         {
498                         j=X509_get_ext_count(x);
499                         /* check to see if this is a signing only certificate */
500                         /* EAY EAY EAY EAY */
501                         }
502                 }
503         else if (i == EVP_PKEY_DSA)
504                 {
505                 ret=SSL_PKEY_DSA_SIGN;
506                 }
507         else if (i == EVP_PKEY_DH)
508                 {
509                 /* if we just have a key, we needs to be guess */
510
511                 if (x == NULL)
512                         ret=SSL_PKEY_DH_DSA;
513                 else
514                         {
515                         j=X509_get_signature_type(x);
516                         if (j == EVP_PKEY_RSA)
517                                 ret=SSL_PKEY_DH_RSA;
518                         else if (j== EVP_PKEY_DSA)
519                                 ret=SSL_PKEY_DH_DSA;
520                         else ret= -1;
521                         }
522                 }
523         else
524                 ret= -1;
525
526 err:
527         if(!pkey) EVP_PKEY_free(pk);
528         return(ret);
529         }
530
531 int ssl_verify_alarm_type(long type)
532         {
533         int al;
534
535         switch(type)
536                 {
537         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
538         case X509_V_ERR_UNABLE_TO_GET_CRL:
539         case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
540                 al=SSL_AD_UNKNOWN_CA;
541                 break;
542         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
543         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
544         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
545         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
546         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
547         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
548         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
549         case X509_V_ERR_CERT_NOT_YET_VALID:
550         case X509_V_ERR_CRL_NOT_YET_VALID:
551                 al=SSL_AD_BAD_CERTIFICATE;
552                 break;
553         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
554         case X509_V_ERR_CRL_SIGNATURE_FAILURE:
555                 al=SSL_AD_DECRYPT_ERROR;
556                 break;
557         case X509_V_ERR_CERT_HAS_EXPIRED:
558         case X509_V_ERR_CRL_HAS_EXPIRED:
559                 al=SSL_AD_CERTIFICATE_EXPIRED;
560                 break;
561         case X509_V_ERR_CERT_REVOKED:
562                 al=SSL_AD_CERTIFICATE_REVOKED;
563                 break;
564         case X509_V_ERR_OUT_OF_MEM:
565                 al=SSL_AD_INTERNAL_ERROR;
566                 break;
567         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
568         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
569         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
570         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
571         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
572                 al=SSL_AD_UNKNOWN_CA;
573                 break;
574         case X509_V_ERR_APPLICATION_VERIFICATION:
575                 al=SSL_AD_HANDSHAKE_FAILURE;
576                 break;
577         default:
578                 al=SSL_AD_CERTIFICATE_UNKNOWN;
579                 break;
580                 }
581         return(al);
582         }
583
584 int ssl3_setup_buffers(SSL *s)
585         {
586         unsigned char *p;
587         unsigned int extra;
588
589         if (s->s3->rbuf.buf == NULL)
590                 {
591                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
592                         extra=SSL3_RT_MAX_EXTRA;
593                 else
594                         extra=0;
595                 if ((p=OPENSSL_malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
596                         == NULL)
597                         goto err;
598                 s->s3->rbuf.buf=p;
599                 }
600
601         if (s->s3->wbuf.buf == NULL)
602                 {
603                 if ((p=OPENSSL_malloc(SSL3_RT_MAX_PACKET_SIZE))
604                         == NULL)
605                         goto err;
606                 s->s3->wbuf.buf=p;
607                 }
608         s->packet= &(s->s3->rbuf.buf[0]);
609         return(1);
610 err:
611         SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
612         return(0);
613         }