ab291928a1296cf7a02ae340c907b216bf4e722f
[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
254 static int ssl23_client_hello(SSL *s)
255         {
256         unsigned char *buf;
257         unsigned char *p,*d;
258         int i,j,ch_len;
259         unsigned long Time,l;
260         int ssl2_compat;
261         int version = 0, version_major, version_minor;
262         SSL_COMP *comp;
263         int ret;
264
265         ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
266
267         if (!(s->options & SSL_OP_NO_TLSv1))
268                 {
269                 version = TLS1_VERSION;
270                 }
271         else if (!(s->options & SSL_OP_NO_SSLv3))
272                 {
273                 version = SSL3_VERSION;
274                 }
275         else if (!(s->options & SSL_OP_NO_SSLv2))
276                 {
277                 version = SSL2_VERSION;
278                 }
279
280         buf=(unsigned char *)s->init_buf->data;
281         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
282                 {
283 #if 0
284                 /* don't reuse session-id's */
285                 if (!ssl_get_new_session(s,0))
286                         {
287                         return(-1);
288                         }
289 #endif
290
291                 p=s->s3->client_random;
292                 Time=(unsigned long)time(NULL);         /* Time */
293                 l2n(Time,p);
294                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
295                         return -1;
296
297                 if (version == TLS1_VERSION)
298                         {
299                         version_major = TLS1_VERSION_MAJOR;
300                         version_minor = TLS1_VERSION_MINOR;
301                         }
302                 else if (version == SSL3_VERSION)
303                         {
304                         version_major = SSL3_VERSION_MAJOR;
305                         version_minor = SSL3_VERSION_MINOR;
306                         }
307                 else if (version == SSL2_VERSION)
308                         {
309                         version_major = SSL2_VERSION_MAJOR;
310                         version_minor = SSL2_VERSION_MINOR;
311                         }
312                 else
313                         {
314                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
315                         return(-1);
316                         }
317
318                 s->client_version = version;
319
320                 if (ssl2_compat)
321                         {
322                         /* create SSL 2.0 compatible Client Hello */
323
324                         /* two byte record header will be written last */
325                         d = &(buf[2]);
326                         p = d + 9; /* leave space for message type, version, individual length fields */
327
328                         *(d++) = SSL2_MT_CLIENT_HELLO;
329                         *(d++) = version_major;
330                         *(d++) = version_minor;
331                         
332                         /* Ciphers supported */
333                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
334                         if (i == 0)
335                                 {
336                                 /* no ciphers */
337                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
338                                 return -1;
339                                 }
340                         s2n(i,d);
341                         p+=i;
342                         
343                         /* put in the session-id length (zero since there is no reuse) */
344 #if 0
345                         s->session->session_id_length=0;
346 #endif
347                         s2n(0,d);
348
349                         if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
350                                 ch_len=SSL2_CHALLENGE_LENGTH;
351                         else
352                                 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
353
354                         /* write out sslv2 challenge */
355                         if (SSL3_RANDOM_SIZE < ch_len)
356                                 i=SSL3_RANDOM_SIZE;
357                         else
358                                 i=ch_len;
359                         s2n(i,d);
360                         memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
361                         if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
362                                 return -1;
363
364                         memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
365                         p+=i;
366
367                         i= p- &(buf[2]);
368                         buf[0]=((i>>8)&0xff)|0x80;
369                         buf[1]=(i&0xff);
370
371                         /* number of bytes to write */
372                         s->init_num=i+2;
373                         s->init_off=0;
374
375                         ssl3_finish_mac(s,&(buf[2]),i);
376                         }
377                 else
378                         {
379                         /* create Client Hello in SSL 3.0/TLS 1.0 format */
380
381                         /* do the record header (5 bytes) and handshake message header (4 bytes) last */
382                         d = p = &(buf[9]);
383                         
384                         *(p++) = version_major;
385                         *(p++) = version_minor;
386
387                         /* Random stuff */
388                         memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
389                         p += SSL3_RANDOM_SIZE;
390
391                         /* Session ID (zero since there is no reuse) */
392                         *(p++) = 0;
393
394                         /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
395                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
396                         if (i == 0)
397                                 {
398                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
399                                 return -1;
400                                 }
401                         s2n(i,p);
402                         p+=i;
403
404                         /* COMPRESSION */
405 #ifdef OPENSSL_NO_COMP
406                         *(p++)=1;
407 #else
408                         if ((s->options & SSL_OP_NO_COMPRESSION)
409                                                 || !s->ctx->comp_methods)
410                                 j=0;
411                         else
412                                 j=sk_SSL_COMP_num(s->ctx->comp_methods);
413                         *(p++)=1+j;
414                         for (i=0; i<j; i++)
415                                 {
416                                 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
417                                 *(p++)=comp->id;
418                                 }
419 #endif
420                         *(p++)=0; /* Add the NULL method */
421
422 #ifndef OPENSSL_NO_TLSEXT
423                         if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
424                                 {
425                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
426                                 return -1;
427                                 }
428 #endif
429                         
430                         l = p-d;
431
432                         /* fill in 4-byte handshake header */
433                         d=&(buf[5]);
434                         *(d++)=SSL3_MT_CLIENT_HELLO;
435                         l2n3(l,d);
436
437                         l += 4;
438
439                         if (l > SSL3_RT_MAX_PLAIN_LENGTH)
440                                 {
441                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
442                                 return -1;
443                                 }
444                         
445                         /* fill in 5-byte record header */
446                         d=buf;
447                         *(d++) = SSL3_RT_HANDSHAKE;
448                         *(d++) = version_major;
449                         *(d++) = version_minor; /* arguably we should send the *lowest* suported version here
450                                                  * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
451                         s2n((int)l,d);
452
453                         /* number of bytes to write */
454                         s->init_num=p-buf;
455                         s->init_off=0;
456
457                         ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
458                         }
459
460                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
461                 s->init_off=0;
462                 }
463
464         /* SSL3_ST_CW_CLNT_HELLO_B */
465         ret = ssl23_write_bytes(s);
466
467         if ((ret >= 2) && s->msg_callback)
468                 {
469                 /* Client Hello has been sent; tell msg_callback */
470
471                 if (ssl2_compat)
472                         s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
473                 else
474                         s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
475                 }
476
477         return ret;
478         }
479
480 static int ssl23_get_server_hello(SSL *s)
481         {
482         char buf[8];
483         unsigned char *p;
484         int i;
485         int n;
486
487         n=ssl23_read_bytes(s,7);
488
489         if (n != 7) return(n);
490         p=s->packet;
491
492         memcpy(buf,p,n);
493
494         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
495                 (p[5] == 0x00) && (p[6] == 0x02))
496                 {
497 #ifdef OPENSSL_NO_SSL2
498                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
499                 goto err;
500 #else
501                 /* we are talking sslv2 */
502                 /* we need to clean up the SSLv3 setup and put in the
503                  * sslv2 stuff. */
504                 int ch_len;
505
506                 if (s->options & SSL_OP_NO_SSLv2)
507                         {
508                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
509                         goto err;
510                         }
511                 if (s->s2 == NULL)
512                         {
513                         if (!ssl2_new(s))
514                                 goto err;
515                         }
516                 else
517                         ssl2_clear(s);
518
519                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
520                         ch_len=SSL2_CHALLENGE_LENGTH;
521                 else
522                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
523
524                 /* write out sslv2 challenge */
525                 i=(SSL3_RANDOM_SIZE < ch_len)
526                         ?SSL3_RANDOM_SIZE:ch_len;
527                 s->s2->challenge_length=i;
528                 memcpy(s->s2->challenge,
529                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
530
531                 if (s->s3 != NULL) ssl3_free(s);
532
533                 if (!BUF_MEM_grow_clean(s->init_buf,
534                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
535                         {
536                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
537                         goto err;
538                         }
539
540                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
541                 if (!(s->client_version == SSL2_VERSION))
542                         /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
543                         s->s2->ssl2_rollback=1;
544
545                 /* setup the 5 bytes we have read so we get them from
546                  * the sslv2 buffer */
547                 s->rstate=SSL_ST_READ_HEADER;
548                 s->packet_length=n;
549                 s->packet= &(s->s2->rbuf[0]);
550                 memcpy(s->packet,buf,n);
551                 s->s2->rbuf_left=n;
552                 s->s2->rbuf_offs=0;
553
554                 /* we have already written one */
555                 s->s2->write_sequence=1;
556
557                 s->method=SSLv2_client_method();
558                 s->handshake_func=s->method->ssl_connect;
559 #endif
560                 }
561         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
562                  (p[1] == SSL3_VERSION_MAJOR) &&
563                  ((p[2] == SSL3_VERSION_MINOR) ||
564                   (p[2] == TLS1_VERSION_MINOR)) &&
565                  (p[5] == SSL3_MT_SERVER_HELLO))
566                 {
567                 /* we have sslv3 or tls1 */
568         have_sslv3_or_tls1:     
569
570                 if (!ssl_init_wbio_buffer(s,1)) goto err;
571
572                 /* we are in this state */
573                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
574
575                 /* put the 5 bytes we have read into the input buffer
576                  * for SSLv3 */
577                 s->rstate=SSL_ST_READ_HEADER;
578                 s->packet_length=n;
579                 s->packet= &(s->s3->rbuf.buf[0]);
580                 memcpy(s->packet,buf,n);
581                 s->s3->rbuf.left=n;
582                 s->s3->rbuf.offset=0;
583
584                 if ((p[2] == SSL3_VERSION_MINOR) &&
585                         !(s->options & SSL_OP_NO_SSLv3))
586                         {
587                         s->version=SSL3_VERSION;
588                         s->method=SSLv3_client_method();
589                         }
590                 else if ((p[2] == TLS1_VERSION_MINOR) &&
591                         !(s->options & SSL_OP_NO_TLSv1))
592                         {
593                         s->version=TLS1_VERSION;
594                         s->method=TLSv1_client_method();
595                         }
596                 else
597                         {
598                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
599                         goto err;
600                         }
601                         
602                 s->handshake_func=s->method->ssl_connect;
603                 }
604         else if ((p[0] == SSL3_RT_ALERT) &&
605                  (p[1] == SSL3_VERSION_MAJOR) &&
606                  ((p[2] == SSL3_VERSION_MINOR) ||
607                   (p[2] == TLS1_VERSION_MINOR)) &&
608                  (p[3] == 0) &&
609                  (p[4] == 2))
610                 {
611                 void (*cb)(const SSL *ssl,int type,int val)=NULL;
612                 int j;
613
614                 /* An alert */
615                 if (s->info_callback != NULL)
616                         cb=s->info_callback;
617                 else if (s->ctx->info_callback != NULL)
618                         cb=s->ctx->info_callback;
619  
620                 i=p[5];
621                 if (cb != NULL)
622                         {
623                         j=(i<<8)|p[6];
624                         cb(s,SSL_CB_READ_ALERT,j);
625                         }
626
627                 if (p[5] == SSL3_AL_WARNING)
628                         goto have_sslv3_or_tls1;
629
630                 s->rwstate=SSL_NOTHING;
631                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
632                 goto err;
633                 }
634         else
635                 {
636                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
637                 goto err;
638                 }
639         s->init_num=0;
640
641         /* Since, if we are sending a ssl23 client hello, we are not
642          * reusing a session-id */
643         if (!ssl_get_new_session(s,0))
644                 goto err;
645
646         s->first_packet=1;
647         return(SSL_connect(s));
648 err:
649         return(-1);
650         }
651