Update from 1.0.0-stable
[openssl.git] / ssl / s23_clnt.c
1 /* ssl/s23_clnt.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) 1998-2006 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 <stdio.h>
113 #include "ssl_locl.h"
114 #include <openssl/buffer.h>
115 #include <openssl/rand.h>
116 #include <openssl/objects.h>
117 #include <openssl/evp.h>
118
119 static const SSL_METHOD *ssl23_get_client_method(int ver);
120 static int ssl23_client_hello(SSL *s);
121 static int ssl23_get_server_hello(SSL *s);
122 static const SSL_METHOD *ssl23_get_client_method(int ver)
123         {
124 #ifndef OPENSSL_NO_SSL2
125         if (ver == SSL2_VERSION)
126                 return(SSLv2_client_method());
127 #endif
128         if (ver == SSL3_VERSION)
129                 return(SSLv3_client_method());
130         else if (ver == TLS1_VERSION)
131                 return(TLSv1_client_method());
132         else
133                 return(NULL);
134         }
135
136 IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
137                         ssl_undefined_function,
138                         ssl23_connect,
139                         ssl23_get_client_method)
140
141 int ssl23_connect(SSL *s)
142         {
143         BUF_MEM *buf=NULL;
144         unsigned long Time=(unsigned long)time(NULL);
145         void (*cb)(const SSL *ssl,int type,int val)=NULL;
146         int ret= -1;
147         int new_state,state;
148
149         RAND_add(&Time,sizeof(Time),0);
150         ERR_clear_error();
151         clear_sys_error();
152
153         if (s->info_callback != NULL)
154                 cb=s->info_callback;
155         else if (s->ctx->info_callback != NULL)
156                 cb=s->ctx->info_callback;
157         
158         s->in_handshake++;
159         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
160
161         for (;;)
162                 {
163                 state=s->state;
164
165                 switch(s->state)
166                         {
167                 case SSL_ST_BEFORE:
168                 case SSL_ST_CONNECT:
169                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
170                 case SSL_ST_OK|SSL_ST_CONNECT:
171
172                         if (s->session != NULL)
173                                 {
174                                 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
175                                 ret= -1;
176                                 goto end;
177                                 }
178                         s->server=0;
179                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
180
181                         /* s->version=TLS1_VERSION; */
182                         s->type=SSL_ST_CONNECT;
183
184                         if (s->init_buf == NULL)
185                                 {
186                                 if ((buf=BUF_MEM_new()) == NULL)
187                                         {
188                                         ret= -1;
189                                         goto end;
190                                         }
191                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
192                                         {
193                                         ret= -1;
194                                         goto end;
195                                         }
196                                 s->init_buf=buf;
197                                 buf=NULL;
198                                 }
199
200                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
201
202                         ssl3_init_finished_mac(s);
203
204                         s->state=SSL23_ST_CW_CLNT_HELLO_A;
205                         s->ctx->stats.sess_connect++;
206                         s->init_num=0;
207                         break;
208
209                 case SSL23_ST_CW_CLNT_HELLO_A:
210                 case SSL23_ST_CW_CLNT_HELLO_B:
211
212                         s->shutdown=0;
213                         ret=ssl23_client_hello(s);
214                         if (ret <= 0) goto end;
215                         s->state=SSL23_ST_CR_SRVR_HELLO_A;
216                         s->init_num=0;
217
218                         break;
219
220                 case SSL23_ST_CR_SRVR_HELLO_A:
221                 case SSL23_ST_CR_SRVR_HELLO_B:
222                         ret=ssl23_get_server_hello(s);
223                         if (ret >= 0) cb=NULL;
224                         goto end;
225                         /* break; */
226
227                 default:
228                         SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
229                         ret= -1;
230                         goto end;
231                         /* break; */
232                         }
233
234                 if (s->debug) { (void)BIO_flush(s->wbio); }
235
236                 if ((cb != NULL) && (s->state != state))
237                         {
238                         new_state=s->state;
239                         s->state=state;
240                         cb(s,SSL_CB_CONNECT_LOOP,1);
241                         s->state=new_state;
242                         }
243                 }
244 end:
245         s->in_handshake--;
246         if (buf != NULL)
247                 BUF_MEM_free(buf);
248         if (cb != NULL)
249                 cb(s,SSL_CB_CONNECT_EXIT,ret);
250         return(ret);
251         }
252
253 static int ssl23_no_ssl2_ciphers(SSL *s)
254         {
255         SSL_CIPHER *cipher;
256         STACK_OF(SSL_CIPHER) *ciphers;
257         int i;
258         ciphers = SSL_get_ciphers(s);
259         for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++)
260                 {
261                 cipher = sk_SSL_CIPHER_value(ciphers, i);
262                 if (cipher->algorithm_ssl == SSL_SSLV2)
263                         return 0;
264                 }
265         return 1;
266         }
267
268 static int ssl23_client_hello(SSL *s)
269         {
270         unsigned char *buf;
271         unsigned char *p,*d;
272         int i,j,ch_len;
273         unsigned long Time,l;
274         int ssl2_compat;
275         int version = 0, version_major, version_minor;
276         SSL_COMP *comp;
277         int ret;
278
279         ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
280
281         if (ssl2_compat && ssl23_no_ssl2_ciphers(s))
282                 ssl2_compat = 0;
283
284         if (!(s->options & SSL_OP_NO_TLSv1))
285                 {
286                 version = TLS1_VERSION;
287                 }
288         else if (!(s->options & SSL_OP_NO_SSLv3))
289                 {
290                 version = SSL3_VERSION;
291                 }
292         else if (!(s->options & SSL_OP_NO_SSLv2))
293                 {
294                 version = SSL2_VERSION;
295                 }
296 #ifndef OPENSSL_NO_TLSEXT
297         if (version != SSL2_VERSION)
298                 {
299                 /* have to disable SSL 2.0 compatibility if we need TLS extensions */
300
301                 if (s->tlsext_hostname != NULL)
302                         ssl2_compat = 0;
303                 if (s->tlsext_status_type != -1)
304                         ssl2_compat = 0;
305                 
306 #ifdef TLSEXT_TYPE_opaque_prf_input
307                 if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL)
308                         ssl2_compat = 0;
309 #endif
310                 }
311 #endif
312
313         buf=(unsigned char *)s->init_buf->data;
314         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
315                 {
316 #if 0
317                 /* don't reuse session-id's */
318                 if (!ssl_get_new_session(s,0))
319                         {
320                         return(-1);
321                         }
322 #endif
323
324                 p=s->s3->client_random;
325                 Time=(unsigned long)time(NULL);         /* Time */
326                 l2n(Time,p);
327                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
328                         return -1;
329
330                 if (version == TLS1_VERSION)
331                         {
332                         version_major = TLS1_VERSION_MAJOR;
333                         version_minor = TLS1_VERSION_MINOR;
334                         }
335                 else if (version == SSL3_VERSION)
336                         {
337                         version_major = SSL3_VERSION_MAJOR;
338                         version_minor = SSL3_VERSION_MINOR;
339                         }
340                 else if (version == SSL2_VERSION)
341                         {
342                         version_major = SSL2_VERSION_MAJOR;
343                         version_minor = SSL2_VERSION_MINOR;
344                         }
345                 else
346                         {
347                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
348                         return(-1);
349                         }
350
351                 s->client_version = version;
352
353                 if (ssl2_compat)
354                         {
355                         /* create SSL 2.0 compatible Client Hello */
356
357                         /* two byte record header will be written last */
358                         d = &(buf[2]);
359                         p = d + 9; /* leave space for message type, version, individual length fields */
360
361                         *(d++) = SSL2_MT_CLIENT_HELLO;
362                         *(d++) = version_major;
363                         *(d++) = version_minor;
364                         
365                         /* Ciphers supported */
366                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
367                         if (i == 0)
368                                 {
369                                 /* no ciphers */
370                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
371                                 return -1;
372                                 }
373                         s2n(i,d);
374                         p+=i;
375                         
376                         /* put in the session-id length (zero since there is no reuse) */
377 #if 0
378                         s->session->session_id_length=0;
379 #endif
380                         s2n(0,d);
381
382                         if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
383                                 ch_len=SSL2_CHALLENGE_LENGTH;
384                         else
385                                 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
386
387                         /* write out sslv2 challenge */
388                         /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32),
389                            because it is one of SSL2_MAX_CHALLENGE_LENGTH (32)
390                            or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the
391                            check in for futurproofing */
392                         if (SSL3_RANDOM_SIZE < ch_len)
393                                 i=SSL3_RANDOM_SIZE;
394                         else
395                                 i=ch_len;
396                         s2n(i,d);
397                         memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
398                         if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
399                                 return -1;
400
401                         memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
402                         p+=i;
403
404                         i= p- &(buf[2]);
405                         buf[0]=((i>>8)&0xff)|0x80;
406                         buf[1]=(i&0xff);
407
408                         /* number of bytes to write */
409                         s->init_num=i+2;
410                         s->init_off=0;
411
412                         ssl3_finish_mac(s,&(buf[2]),i);
413                         }
414                 else
415                         {
416                         /* create Client Hello in SSL 3.0/TLS 1.0 format */
417
418                         /* do the record header (5 bytes) and handshake message header (4 bytes) last */
419                         d = p = &(buf[9]);
420                         
421                         *(p++) = version_major;
422                         *(p++) = version_minor;
423
424                         /* Random stuff */
425                         memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
426                         p += SSL3_RANDOM_SIZE;
427
428                         /* Session ID (zero since there is no reuse) */
429                         *(p++) = 0;
430
431                         /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
432                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
433                         if (i == 0)
434                                 {
435                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
436                                 return -1;
437                                 }
438                         s2n(i,p);
439                         p+=i;
440
441                         /* COMPRESSION */
442 #ifdef OPENSSL_NO_COMP
443                         *(p++)=1;
444 #else
445                         if ((s->options & SSL_OP_NO_COMPRESSION)
446                                                 || !s->ctx->comp_methods)
447                                 j=0;
448                         else
449                                 j=sk_SSL_COMP_num(s->ctx->comp_methods);
450                         *(p++)=1+j;
451                         for (i=0; i<j; i++)
452                                 {
453                                 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
454                                 *(p++)=comp->id;
455                                 }
456 #endif
457                         *(p++)=0; /* Add the NULL method */
458
459 #ifndef OPENSSL_NO_TLSEXT
460                         /* TLS extensions*/
461                         if (ssl_prepare_clienthello_tlsext(s) <= 0)
462                                 {
463                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
464                                 return -1;
465                                 }
466                         if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
467                                 {
468                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
469                                 return -1;
470                                 }
471 #endif
472                         
473                         l = p-d;
474
475                         /* fill in 4-byte handshake header */
476                         d=&(buf[5]);
477                         *(d++)=SSL3_MT_CLIENT_HELLO;
478                         l2n3(l,d);
479
480                         l += 4;
481
482                         if (l > SSL3_RT_MAX_PLAIN_LENGTH)
483                                 {
484                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
485                                 return -1;
486                                 }
487                         
488                         /* fill in 5-byte record header */
489                         d=buf;
490                         *(d++) = SSL3_RT_HANDSHAKE;
491                         *(d++) = version_major;
492                         *(d++) = version_minor; /* arguably we should send the *lowest* suported version here
493                                                  * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
494                         s2n((int)l,d);
495
496                         /* number of bytes to write */
497                         s->init_num=p-buf;
498                         s->init_off=0;
499
500                         ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
501                         }
502
503                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
504                 s->init_off=0;
505                 }
506
507         /* SSL3_ST_CW_CLNT_HELLO_B */
508         ret = ssl23_write_bytes(s);
509
510         if ((ret >= 2) && s->msg_callback)
511                 {
512                 /* Client Hello has been sent; tell msg_callback */
513
514                 if (ssl2_compat)
515                         s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
516                 else
517                         s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
518                 }
519
520         return ret;
521         }
522
523 static int ssl23_get_server_hello(SSL *s)
524         {
525         char buf[8];
526         unsigned char *p;
527         int i;
528         int n;
529
530         n=ssl23_read_bytes(s,7);
531
532         if (n != 7) return(n);
533         p=s->packet;
534
535         memcpy(buf,p,n);
536
537         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
538                 (p[5] == 0x00) && (p[6] == 0x02))
539                 {
540 #ifdef OPENSSL_NO_SSL2
541                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
542                 goto err;
543 #else
544                 /* we are talking sslv2 */
545                 /* we need to clean up the SSLv3 setup and put in the
546                  * sslv2 stuff. */
547                 int ch_len;
548
549                 if (s->options & SSL_OP_NO_SSLv2)
550                         {
551                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
552                         goto err;
553                         }
554                 if (s->s2 == NULL)
555                         {
556                         if (!ssl2_new(s))
557                                 goto err;
558                         }
559                 else
560                         ssl2_clear(s);
561
562                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
563                         ch_len=SSL2_CHALLENGE_LENGTH;
564                 else
565                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
566
567                 /* write out sslv2 challenge */
568                 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because
569                    it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or
570                    SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for
571                    futurproofing */
572                 i=(SSL3_RANDOM_SIZE < ch_len)
573                         ?SSL3_RANDOM_SIZE:ch_len;
574                 s->s2->challenge_length=i;
575                 memcpy(s->s2->challenge,
576                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
577
578                 if (s->s3 != NULL) ssl3_free(s);
579
580                 if (!BUF_MEM_grow_clean(s->init_buf,
581                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
582                         {
583                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
584                         goto err;
585                         }
586
587                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
588                 if (!(s->client_version == SSL2_VERSION))
589                         /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
590                         s->s2->ssl2_rollback=1;
591
592                 /* setup the 7 bytes we have read so we get them from
593                  * the sslv2 buffer */
594                 s->rstate=SSL_ST_READ_HEADER;
595                 s->packet_length=n;
596                 s->packet= &(s->s2->rbuf[0]);
597                 memcpy(s->packet,buf,n);
598                 s->s2->rbuf_left=n;
599                 s->s2->rbuf_offs=0;
600
601                 /* we have already written one */
602                 s->s2->write_sequence=1;
603
604                 s->method=SSLv2_client_method();
605                 s->handshake_func=s->method->ssl_connect;
606 #endif
607                 }
608         else if (p[1] == SSL3_VERSION_MAJOR &&
609                  (p[2] == SSL3_VERSION_MINOR || p[2] == TLS1_VERSION_MINOR) &&
610                  ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
611                   (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2)))
612                 {
613                 /* we have sslv3 or tls1 (server hello or alert) */
614
615                 if ((p[2] == SSL3_VERSION_MINOR) &&
616                         !(s->options & SSL_OP_NO_SSLv3))
617                         {
618                         s->version=SSL3_VERSION;
619                         s->method=SSLv3_client_method();
620                         }
621                 else if ((p[2] == TLS1_VERSION_MINOR) &&
622                         !(s->options & SSL_OP_NO_TLSv1))
623                         {
624                         s->version=TLS1_VERSION;
625                         s->method=TLSv1_client_method();
626                         }
627                 else
628                         {
629                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
630                         goto err;
631                         }
632
633                 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING)
634                         {
635                         /* fatal alert */
636
637                         void (*cb)(const SSL *ssl,int type,int val)=NULL;
638                         int j;
639
640                         if (s->info_callback != NULL)
641                                 cb=s->info_callback;
642                         else if (s->ctx->info_callback != NULL)
643                                 cb=s->ctx->info_callback;
644  
645                         i=p[5];
646                         if (cb != NULL)
647                                 {
648                                 j=(i<<8)|p[6];
649                                 cb(s,SSL_CB_READ_ALERT,j);
650                                 }
651                         
652                         if (s->msg_callback)
653                                 s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg);
654
655                         s->rwstate=SSL_NOTHING;
656                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
657                         goto err;
658                         }
659
660                 if (!ssl_init_wbio_buffer(s,1)) goto err;
661
662                 /* we are in this state */
663                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
664
665                 /* put the 7 bytes we have read into the input buffer
666                  * for SSLv3 */
667                 s->rstate=SSL_ST_READ_HEADER;
668                 s->packet_length=n;
669                 if (s->s3->rbuf.buf == NULL)
670                         if (!ssl3_setup_read_buffer(s))
671                                 goto err;
672                 s->packet= &(s->s3->rbuf.buf[0]);
673                 memcpy(s->packet,buf,n);
674                 s->s3->rbuf.left=n;
675                 s->s3->rbuf.offset=0;
676
677                 s->handshake_func=s->method->ssl_connect;
678                 }
679         else
680                 {
681                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
682                 goto err;
683                 }
684         s->init_num=0;
685
686         /* Since, if we are sending a ssl23 client hello, we are not
687          * reusing a session-id */
688         if (!ssl_get_new_session(s,0))
689                 goto err;
690
691         return(SSL_connect(s));
692 err:
693         return(-1);
694         }