b26fbe36371648926f50cc891d507348ba5bbbc7
[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) 1998-2002 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  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  * ECC cipher suite support in OpenSSL originally developed by 
114  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
115  */
116
117 #include <limits.h>
118 #include <string.h>
119 #include <stdio.h>
120 #include "ssl_locl.h"
121 #include <openssl/buffer.h>
122 #include <openssl/rand.h>
123 #include <openssl/objects.h>
124 #include <openssl/evp.h>
125 #include <openssl/x509.h>
126
127 /* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
128 int ssl3_do_write(SSL *s, int type)
129         {
130         int ret;
131
132         ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off],
133                              s->init_num);
134         if (ret < 0) return(-1);
135         if (type == SSL3_RT_HANDSHAKE)
136                 /* should not be done for 'Hello Request's, but in that case
137                  * we'll ignore the result anyway */
138                 ssl3_finish_mac(s,(unsigned char *)&s->init_buf->data[s->init_off],ret);
139         
140         if (ret == s->init_num)
141                 {
142                 if (s->msg_callback)
143                         s->msg_callback(1, s->version, type, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg);
144                 return(1);
145                 }
146         s->init_off+=ret;
147         s->init_num-=ret;
148         return(0);
149         }
150
151 int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
152         {
153         unsigned char *p,*d;
154         int i;
155         unsigned long l;
156
157         if (s->state == a)
158                 {
159                 d=(unsigned char *)s->init_buf->data;
160                 p= &(d[4]);
161
162                 i=s->method->ssl3_enc->final_finish_mac(s,
163                         &(s->s3->finish_dgst1),
164                         &(s->s3->finish_dgst2),
165                         sender,slen,s->s3->tmp.finish_md);
166                 s->s3->tmp.finish_md_len = i;
167                 memcpy(p, s->s3->tmp.finish_md, i);
168                 p+=i;
169                 l=i;
170
171 #ifdef OPENSSL_SYS_WIN16
172                 /* MSVC 1.5 does not clear the top bytes of the word unless
173                  * I do this.
174                  */
175                 l&=0xffff;
176 #endif
177
178                 *(d++)=SSL3_MT_FINISHED;
179                 l2n3(l,d);
180                 s->init_num=(int)l+4;
181                 s->init_off=0;
182
183                 s->state=b;
184                 }
185
186         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
187         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
188         }
189
190 int ssl3_get_finished(SSL *s, int a, int b)
191         {
192         int al,i,ok;
193         long n;
194         unsigned char *p;
195
196         /* the mac has already been generated when we received the
197          * change cipher spec message and is in s->s3->tmp.peer_finish_md
198          */ 
199
200         n=ssl3_get_message(s,
201                 a,
202                 b,
203                 SSL3_MT_FINISHED,
204                 64, /* should actually be 36+4 :-) */
205                 &ok);
206
207         if (!ok) return((int)n);
208
209         /* If this occurs, we have missed a message */
210         if (!s->s3->change_cipher_spec)
211                 {
212                 al=SSL_AD_UNEXPECTED_MESSAGE;
213                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
214                 goto f_err;
215                 }
216         s->s3->change_cipher_spec=0;
217
218         p = (unsigned char *)s->init_msg;
219         i = s->s3->tmp.peer_finish_md_len;
220
221         if (i != n)
222                 {
223                 al=SSL_AD_DECODE_ERROR;
224                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
225                 goto f_err;
226                 }
227
228         if (memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
229                 {
230                 al=SSL_AD_DECRYPT_ERROR;
231                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
232                 goto f_err;
233                 }
234
235         return(1);
236 f_err:
237         ssl3_send_alert(s,SSL3_AL_FATAL,al);
238         return(0);
239         }
240
241 /* for these 2 messages, we need to
242  * ssl->enc_read_ctx                    re-init
243  * ssl->s3->read_sequence               zero
244  * ssl->s3->read_mac_secret             re-init
245  * ssl->session->read_sym_enc           assign
246  * ssl->session->read_compression       assign
247  * ssl->session->read_hash              assign
248  */
249 int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
250         { 
251         unsigned char *p;
252
253         if (s->state == a)
254                 {
255                 p=(unsigned char *)s->init_buf->data;
256                 *p=SSL3_MT_CCS;
257                 s->init_num=1;
258                 s->init_off=0;
259
260                 s->state=b;
261                 }
262
263         /* SSL3_ST_CW_CHANGE_B */
264         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
265         }
266
267 unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
268         {
269         unsigned char *p;
270         int n,i;
271         unsigned long l=7;
272         BUF_MEM *buf;
273         X509_STORE_CTX xs_ctx;
274         X509_OBJECT obj;
275
276         int no_chain;
277
278         if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || s->ctx->extra_certs)
279                 no_chain = 1;
280         else
281                 no_chain = 0;
282
283         /* TLSv1 sends a chain with nothing in it, instead of an alert */
284         buf=s->init_buf;
285         if (!BUF_MEM_grow_clean(buf,10))
286                 {
287                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
288                 return(0);
289                 }
290         if (x != NULL)
291                 {
292                 if(!no_chain && !X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL))
293                         {
294                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);
295                         return(0);
296                         }
297
298                 for (;;)
299                         {
300                         n=i2d_X509(x,NULL);
301                         if (!BUF_MEM_grow_clean(buf,(int)(n+l+3)))
302                                 {
303                                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
304                                 return(0);
305                                 }
306                         p=(unsigned char *)&(buf->data[l]);
307                         l2n3(n,p);
308                         i2d_X509(x,&p);
309                         l+=n+3;
310
311                         if (no_chain)
312                                 break;
313
314                         if (X509_NAME_cmp(X509_get_subject_name(x),
315                                 X509_get_issuer_name(x)) == 0) break;
316
317                         i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
318                                 X509_get_issuer_name(x),&obj);
319                         if (i <= 0) break;
320                         x=obj.data.x509;
321                         /* Count is one too high since the X509_STORE_get uped the
322                          * ref count */
323                         X509_free(x);
324                         }
325                 if (!no_chain)
326                         X509_STORE_CTX_cleanup(&xs_ctx);
327                 }
328
329         /* Thawte special :-) */
330         if (s->ctx->extra_certs != NULL)
331         for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
332                 {
333                 x=sk_X509_value(s->ctx->extra_certs,i);
334                 n=i2d_X509(x,NULL);
335                 if (!BUF_MEM_grow_clean(buf,(int)(n+l+3)))
336                         {
337                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
338                         return(0);
339                         }
340                 p=(unsigned char *)&(buf->data[l]);
341                 l2n3(n,p);
342                 i2d_X509(x,&p);
343                 l+=n+3;
344                 }
345
346         l-=7;
347         p=(unsigned char *)&(buf->data[4]);
348         l2n3(l,p);
349         l+=3;
350         p=(unsigned char *)&(buf->data[0]);
351         *(p++)=SSL3_MT_CERTIFICATE;
352         l2n3(l,p);
353         l+=4;
354         return(l);
355         }
356
357 /* Obtain handshake message of message type 'mt' (any if mt == -1),
358  * maximum acceptable body length 'max'.
359  * The first four bytes (msg_type and length) are read in state 'st1',
360  * the body is read in state 'stn'.
361  */
362 long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
363         {
364         unsigned char *p;
365         unsigned long l;
366         long n;
367         int i,al;
368
369         if (s->s3->tmp.reuse_message)
370                 {
371                 s->s3->tmp.reuse_message=0;
372                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
373                         {
374                         al=SSL_AD_UNEXPECTED_MESSAGE;
375                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
376                         goto f_err;
377                         }
378                 *ok=1;
379                 s->init_msg = s->init_buf->data + 4;
380                 s->init_num = (int)s->s3->tmp.message_size;
381                 return s->init_num;
382                 }
383
384         p=(unsigned char *)s->init_buf->data;
385
386         if (s->state == st1) /* s->init_num < 4 */
387                 {
388                 int skip_message;
389
390                 do
391                         {
392                         while (s->init_num < 4)
393                                 {
394                                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],
395                                         4 - s->init_num, 0);
396                                 if (i <= 0)
397                                         {
398                                         s->rwstate=SSL_READING;
399                                         *ok = 0;
400                                         return i;
401                                         }
402                                 s->init_num+=i;
403                                 }
404                         
405                         skip_message = 0;
406                         if (!s->server)
407                                 if (p[0] == SSL3_MT_HELLO_REQUEST)
408                                         /* The server may always send 'Hello Request' messages --
409                                          * we are doing a handshake anyway now, so ignore them
410                                          * if their format is correct. Does not count for
411                                          * 'Finished' MAC. */
412                                         if (p[1] == 0 && p[2] == 0 &&p[3] == 0)
413                                                 {
414                                                 s->init_num = 0;
415                                                 skip_message = 1;
416
417                                                 if (s->msg_callback)
418                                                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, 4, s, s->msg_callback_arg);
419                                                 }
420                         }
421                 while (skip_message);
422
423                 /* s->init_num == 4 */
424
425                 if ((mt >= 0) && (*p != mt))
426                         {
427                         al=SSL_AD_UNEXPECTED_MESSAGE;
428                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
429                         goto f_err;
430                         }
431                 if ((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
432                                         (st1 == SSL3_ST_SR_CERT_A) &&
433                                         (stn == SSL3_ST_SR_CERT_B))
434                         {
435                         /* At this point we have got an MS SGC second client
436                          * hello (maybe we should always allow the client to
437                          * start a new handshake?). We need to restart the mac.
438                          * Don't increment {num,total}_renegotiations because
439                          * we have not completed the handshake. */
440                         ssl3_init_finished_mac(s);
441                         }
442
443                 s->s3->tmp.message_type= *(p++);
444
445                 n2l3(p,l);
446                 if (l > (unsigned long)max)
447                         {
448                         al=SSL_AD_ILLEGAL_PARAMETER;
449                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
450                         goto f_err;
451                         }
452                 if (l > (INT_MAX-4)) /* BUF_MEM_grow takes an 'int' parameter */
453                         {
454                         al=SSL_AD_ILLEGAL_PARAMETER;
455                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
456                         goto f_err;
457                         }
458                 if (l && !BUF_MEM_grow_clean(s->init_buf,(int)l+4))
459                         {
460                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
461                         goto err;
462                         }
463                 s->s3->tmp.message_size=l;
464                 s->state=stn;
465
466                 s->init_msg = s->init_buf->data + 4;
467                 s->init_num = 0;
468                 }
469
470         /* next state (stn) */
471         p = s->init_msg;
472         n = s->s3->tmp.message_size - s->init_num;
473         while (n > 0)
474                 {
475                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n,0);
476                 if (i <= 0)
477                         {
478                         s->rwstate=SSL_READING;
479                         *ok = 0;
480                         return i;
481                         }
482                 s->init_num += i;
483                 n -= i;
484                 }
485         ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4);
486         if (s->msg_callback)
487                 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, (size_t)s->init_num + 4, s, s->msg_callback_arg);
488         *ok=1;
489         return s->init_num;
490 f_err:
491         ssl3_send_alert(s,SSL3_AL_FATAL,al);
492 err:
493         *ok=0;
494         return(-1);
495         }
496
497 int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
498         {
499         EVP_PKEY *pk;
500         int ret= -1,i;
501
502         if (pkey == NULL)
503                 pk=X509_get_pubkey(x);
504         else
505                 pk=pkey;
506         if (pk == NULL) goto err;
507
508         i=pk->type;
509         if (i == EVP_PKEY_RSA)
510                 {
511                 ret=SSL_PKEY_RSA_ENC;
512                 }
513         else if (i == EVP_PKEY_DSA)
514                 {
515                 ret=SSL_PKEY_DSA_SIGN;
516                 }
517 #ifndef OPENSSL_NO_EC
518         else if (i == EVP_PKEY_EC)
519                 {
520                 ret = SSL_PKEY_ECC;
521                 }
522 #endif
523
524 err:
525         if(!pkey) EVP_PKEY_free(pk);
526         return(ret);
527         }
528
529 int ssl_verify_alarm_type(long type)
530         {
531         int al;
532
533         switch(type)
534                 {
535         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
536         case X509_V_ERR_UNABLE_TO_GET_CRL:
537         case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
538                 al=SSL_AD_UNKNOWN_CA;
539                 break;
540         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
541         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
542         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
543         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
544         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
545         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
546         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
547         case X509_V_ERR_CERT_NOT_YET_VALID:
548         case X509_V_ERR_CRL_NOT_YET_VALID:
549         case X509_V_ERR_CERT_UNTRUSTED:
550         case X509_V_ERR_CERT_REJECTED:
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         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
573         case X509_V_ERR_INVALID_CA:
574                 al=SSL_AD_UNKNOWN_CA;
575                 break;
576         case X509_V_ERR_APPLICATION_VERIFICATION:
577                 al=SSL_AD_HANDSHAKE_FAILURE;
578                 break;
579         case X509_V_ERR_INVALID_PURPOSE:
580                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
581                 break;
582         default:
583                 al=SSL_AD_CERTIFICATE_UNKNOWN;
584                 break;
585                 }
586         return(al);
587         }
588
589 int ssl3_setup_buffers(SSL *s)
590         {
591         unsigned char *p;
592         unsigned int extra;
593         size_t len;
594
595         if (s->s3->rbuf.buf == NULL)
596                 {
597                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
598                         extra=SSL3_RT_MAX_EXTRA;
599                 else
600                         extra=0;
601                 len = SSL3_RT_MAX_PACKET_SIZE + extra;
602                 if ((p=OPENSSL_malloc(len)) == NULL)
603                         goto err;
604                 s->s3->rbuf.buf = p;
605                 s->s3->rbuf.len = len;
606                 }
607
608         if (s->s3->wbuf.buf == NULL)
609                 {
610                 len = SSL3_RT_MAX_PACKET_SIZE;
611                 len += SSL3_RT_HEADER_LENGTH + 256; /* extra space for empty fragment */
612                 if ((p=OPENSSL_malloc(len)) == NULL)
613                         goto err;
614                 s->s3->wbuf.buf = p;
615                 s->s3->wbuf.len = len;
616                 }
617         s->packet= &(s->s3->rbuf.buf[0]);
618         return(1);
619 err:
620         SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
621         return(0);
622         }