Option to set current cert to server certificate.
[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 if (ver == TLS1_1_VERSION)
133                 return(TLSv1_1_client_method());
134         else if (ver == TLS1_2_VERSION)
135                 return(TLSv1_2_client_method());
136         else
137                 return(NULL);
138         }
139
140 IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
141                         ssl_undefined_function,
142                         ssl23_connect,
143                         ssl23_get_client_method)
144
145 int ssl23_connect(SSL *s)
146         {
147         BUF_MEM *buf=NULL;
148         unsigned long Time=(unsigned long)time(NULL);
149         void (*cb)(const SSL *ssl,int type,int val)=NULL;
150         int ret= -1;
151         int new_state,state;
152
153         RAND_add(&Time,sizeof(Time),0);
154         ERR_clear_error();
155         clear_sys_error();
156
157         if (s->info_callback != NULL)
158                 cb=s->info_callback;
159         else if (s->ctx->info_callback != NULL)
160                 cb=s->ctx->info_callback;
161         
162         s->in_handshake++;
163         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
164
165         for (;;)
166                 {
167                 state=s->state;
168
169                 switch(s->state)
170                         {
171                 case SSL_ST_BEFORE:
172                 case SSL_ST_CONNECT:
173                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
174                 case SSL_ST_OK|SSL_ST_CONNECT:
175
176                         if (s->session != NULL)
177                                 {
178                                 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
179                                 ret= -1;
180                                 goto end;
181                                 }
182                         s->server=0;
183                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
184
185                         /* s->version=TLS1_VERSION; */
186                         s->type=SSL_ST_CONNECT;
187
188                         if (s->init_buf == NULL)
189                                 {
190                                 if ((buf=BUF_MEM_new()) == NULL)
191                                         {
192                                         ret= -1;
193                                         goto end;
194                                         }
195                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
196                                         {
197                                         ret= -1;
198                                         goto end;
199                                         }
200                                 s->init_buf=buf;
201                                 buf=NULL;
202                                 }
203
204                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
205
206                         ssl3_init_finished_mac(s);
207
208                         s->state=SSL23_ST_CW_CLNT_HELLO_A;
209                         s->ctx->stats.sess_connect++;
210                         s->init_num=0;
211                         break;
212
213                 case SSL23_ST_CW_CLNT_HELLO_A:
214                 case SSL23_ST_CW_CLNT_HELLO_B:
215
216                         s->shutdown=0;
217                         ret=ssl23_client_hello(s);
218                         if (ret <= 0) goto end;
219                         s->state=SSL23_ST_CR_SRVR_HELLO_A;
220                         s->init_num=0;
221
222                         break;
223
224                 case SSL23_ST_CR_SRVR_HELLO_A:
225                 case SSL23_ST_CR_SRVR_HELLO_B:
226                         ret=ssl23_get_server_hello(s);
227                         if (ret >= 0) cb=NULL;
228                         goto end;
229                         /* break; */
230
231                 default:
232                         SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
233                         ret= -1;
234                         goto end;
235                         /* break; */
236                         }
237
238                 if (s->debug) { (void)BIO_flush(s->wbio); }
239
240                 if ((cb != NULL) && (s->state != state))
241                         {
242                         new_state=s->state;
243                         s->state=state;
244                         cb(s,SSL_CB_CONNECT_LOOP,1);
245                         s->state=new_state;
246                         }
247                 }
248 end:
249         s->in_handshake--;
250         if (buf != NULL)
251                 BUF_MEM_free(buf);
252         if (cb != NULL)
253                 cb(s,SSL_CB_CONNECT_EXIT,ret);
254         return(ret);
255         }
256
257 static int ssl23_no_ssl2_ciphers(SSL *s)
258         {
259         SSL_CIPHER *cipher;
260         STACK_OF(SSL_CIPHER) *ciphers;
261         int i;
262         ciphers = SSL_get_ciphers(s);
263         for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++)
264                 {
265                 cipher = sk_SSL_CIPHER_value(ciphers, i);
266                 if (cipher->algorithm_ssl == SSL_SSLV2)
267                         return 0;
268                 }
269         return 1;
270         }
271
272 /* Fill a ClientRandom or ServerRandom field of length len. Returns <= 0
273  * on failure, 1 on success. */
274 int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len)
275         {
276                 int send_time = 0;
277                 if (len < 4)
278                         return 0;
279                 if (server)
280                         send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0;
281                 else
282                         send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0;
283                 if (send_time)
284                         {
285                         unsigned long Time = time(NULL);
286                         unsigned char *p = result;
287                         l2n(Time, p);
288                         return RAND_pseudo_bytes(p, len-4);
289                         }
290                 else
291                         return RAND_pseudo_bytes(result, len);
292         }
293
294 static int ssl23_client_hello(SSL *s)
295         {
296         unsigned char *buf;
297         unsigned char *p,*d;
298         int i,ch_len;
299         unsigned long l;
300         int ssl2_compat;
301         int version = 0, version_major, version_minor;
302         int al = 0;
303 #ifndef OPENSSL_NO_COMP
304         int j;
305         SSL_COMP *comp;
306 #endif
307         int ret;
308         unsigned long mask, options = s->options;
309
310         ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1;
311
312         if (ssl2_compat && ssl23_no_ssl2_ciphers(s))
313                 ssl2_compat = 0;
314
315         /*
316          * SSL_OP_NO_X disables all protocols above X *if* there are
317          * some protocols below X enabled. This is required in order
318          * to maintain "version capability" vector contiguous. So
319          * that if application wants to disable TLS1.0 in favour of
320          * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the
321          * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2.
322          */
323         mask =  SSL_OP_NO_TLSv1_1|SSL_OP_NO_TLSv1
324 #if !defined(OPENSSL_NO_SSL3)
325                 |SSL_OP_NO_SSLv3
326 #endif
327 #if !defined(OPENSSL_NO_SSL2)
328                 |(ssl2_compat?SSL_OP_NO_SSLv2:0)
329 #endif
330                 ;
331 #if !defined(OPENSSL_NO_TLS1_2_CLIENT)
332         version = TLS1_2_VERSION;
333
334         if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask)
335                 version = TLS1_1_VERSION;
336 #else
337         version = TLS1_1_VERSION;
338 #endif
339         mask &= ~SSL_OP_NO_TLSv1_1;
340         if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
341                 version = TLS1_VERSION;
342         mask &= ~SSL_OP_NO_TLSv1;
343 #if !defined(OPENSSL_NO_SSL3)
344         if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
345                 version = SSL3_VERSION;
346         mask &= ~SSL_OP_NO_SSLv3;
347 #endif
348 #if !defined(OPENSSL_NO_SSL2)
349         if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask)
350                 version = SSL2_VERSION;
351 #endif
352
353 #ifndef OPENSSL_NO_TLSEXT
354         if (version != SSL2_VERSION)
355                 {
356                 /* have to disable SSL 2.0 compatibility if we need TLS extensions */
357
358                 if (s->tlsext_hostname != NULL)
359                         ssl2_compat = 0;
360                 if (s->tlsext_status_type != -1)
361                         ssl2_compat = 0;
362 #ifdef TLSEXT_TYPE_opaque_prf_input
363                 if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL)
364                         ssl2_compat = 0;
365 #endif
366                 if (s->ctx->custom_cli_ext_records_count != 0)
367                         ssl2_compat = 0;
368                 if (s->ctx->cli_supp_data_records_count != 0)
369                         ssl2_compat = 0;
370                 }
371 #endif
372
373         buf=(unsigned char *)s->init_buf->data;
374         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
375                 {
376 #if 0
377                 /* don't reuse session-id's */
378                 if (!ssl_get_new_session(s,0))
379                         {
380                         return(-1);
381                         }
382 #endif
383
384                 p=s->s3->client_random;
385                 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
386                         return -1;
387
388                 if (version == TLS1_2_VERSION)
389                         {
390                         version_major = TLS1_2_VERSION_MAJOR;
391                         version_minor = TLS1_2_VERSION_MINOR;
392                         }
393                 else if (tls1_suiteb(s))
394                         {
395                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,
396                                         SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
397                         return -1;
398                         }
399                 else if (version == TLS1_1_VERSION)
400                         {
401                         version_major = TLS1_1_VERSION_MAJOR;
402                         version_minor = TLS1_1_VERSION_MINOR;
403                         }
404                 else if (version == TLS1_VERSION)
405                         {
406                         version_major = TLS1_VERSION_MAJOR;
407                         version_minor = TLS1_VERSION_MINOR;
408                         }
409 #ifdef OPENSSL_FIPS
410                 else if(FIPS_mode())
411                         {
412                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,
413                                         SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
414                         return -1;
415                         }
416 #endif
417                 else if (version == SSL3_VERSION)
418                         {
419                         version_major = SSL3_VERSION_MAJOR;
420                         version_minor = SSL3_VERSION_MINOR;
421                         }
422                 else if (version == SSL2_VERSION)
423                         {
424                         version_major = SSL2_VERSION_MAJOR;
425                         version_minor = SSL2_VERSION_MINOR;
426                         }
427                 else
428                         {
429                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
430                         return(-1);
431                         }
432
433                 s->client_version = version;
434
435                 if (ssl2_compat)
436                         {
437                         /* create SSL 2.0 compatible Client Hello */
438
439                         /* two byte record header will be written last */
440                         d = &(buf[2]);
441                         p = d + 9; /* leave space for message type, version, individual length fields */
442
443                         *(d++) = SSL2_MT_CLIENT_HELLO;
444                         *(d++) = version_major;
445                         *(d++) = version_minor;
446                         
447                         /* Ciphers supported */
448                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
449                         if (i == 0)
450                                 {
451                                 /* no ciphers */
452                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
453                                 return -1;
454                                 }
455                         s2n(i,d);
456                         p+=i;
457                         
458                         /* put in the session-id length (zero since there is no reuse) */
459 #if 0
460                         s->session->session_id_length=0;
461 #endif
462                         s2n(0,d);
463
464                         if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
465                                 ch_len=SSL2_CHALLENGE_LENGTH;
466                         else
467                                 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
468
469                         /* write out sslv2 challenge */
470                         /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32),
471                            because it is one of SSL2_MAX_CHALLENGE_LENGTH (32)
472                            or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the
473                            check in for futurproofing */
474                         if (SSL3_RANDOM_SIZE < ch_len)
475                                 i=SSL3_RANDOM_SIZE;
476                         else
477                                 i=ch_len;
478                         s2n(i,d);
479                         memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
480                         if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
481                                 return -1;
482
483                         memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
484                         p+=i;
485
486                         i= p- &(buf[2]);
487                         buf[0]=((i>>8)&0xff)|0x80;
488                         buf[1]=(i&0xff);
489
490                         /* number of bytes to write */
491                         s->init_num=i+2;
492                         s->init_off=0;
493
494                         ssl3_finish_mac(s,&(buf[2]),i);
495                         }
496                 else
497                         {
498                         /* create Client Hello in SSL 3.0/TLS 1.0 format */
499
500                         /* do the record header (5 bytes) and handshake message header (4 bytes) last */
501                         d = p = &(buf[9]);
502                         
503                         *(p++) = version_major;
504                         *(p++) = version_minor;
505
506                         /* Random stuff */
507                         memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
508                         p += SSL3_RANDOM_SIZE;
509
510                         /* Session ID (zero since there is no reuse) */
511                         *(p++) = 0;
512
513                         /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
514                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
515                         if (i == 0)
516                                 {
517                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
518                                 return -1;
519                                 }
520 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
521                         /* Some servers hang if client hello > 256 bytes
522                          * as hack workaround chop number of supported ciphers
523                          * to keep it well below this if we use TLS v1.2
524                          */
525                         if (TLS1_get_version(s) >= TLS1_2_VERSION
526                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
527                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
528 #endif
529                         s2n(i,p);
530                         p+=i;
531
532                         /* COMPRESSION */
533 #ifdef OPENSSL_NO_COMP
534                         *(p++)=1;
535 #else
536                         if ((s->options & SSL_OP_NO_COMPRESSION)
537                                                 || !s->ctx->comp_methods)
538                                 j=0;
539                         else
540                                 j=sk_SSL_COMP_num(s->ctx->comp_methods);
541                         *(p++)=1+j;
542                         for (i=0; i<j; i++)
543                                 {
544                                 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
545                                 *(p++)=comp->id;
546                                 }
547 #endif
548                         *(p++)=0; /* Add the NULL method */
549
550 #ifndef OPENSSL_NO_TLSEXT
551                         /* TLS extensions*/
552                         if (ssl_prepare_clienthello_tlsext(s) <= 0)
553                                 {
554                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
555                                 return -1;
556                                 }
557                         if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
558                                 {
559                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
560                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
561                                 return -1;
562                                 }
563 #endif
564                         
565                         l = p-d;
566
567                         /* fill in 4-byte handshake header */
568                         d=&(buf[5]);
569                         *(d++)=SSL3_MT_CLIENT_HELLO;
570                         l2n3(l,d);
571
572                         l += 4;
573
574                         if (l > SSL3_RT_MAX_PLAIN_LENGTH)
575                                 {
576                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
577                                 return -1;
578                                 }
579                         
580                         /* fill in 5-byte record header */
581                         d=buf;
582                         *(d++) = SSL3_RT_HANDSHAKE;
583                         *(d++) = version_major;
584                         /* Some servers hang if we use long client hellos
585                          * and a record number > TLS 1.0.
586                          */
587                         if (TLS1_get_client_version(s) > TLS1_VERSION)
588                                 *(d++) = 1;
589                         else
590                                 *(d++) = version_minor;
591                         s2n((int)l,d);
592
593                         /* number of bytes to write */
594                         s->init_num=p-buf;
595                         s->init_off=0;
596
597                         ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
598                         }
599
600                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
601                 s->init_off=0;
602                 }
603
604         /* SSL3_ST_CW_CLNT_HELLO_B */
605         ret = ssl23_write_bytes(s);
606
607         if ((ret >= 2) && s->msg_callback)
608                 {
609                 /* Client Hello has been sent; tell msg_callback */
610
611                 if (ssl2_compat)
612                         s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
613                 else
614                         {
615                         s->msg_callback(1, version, SSL3_RT_HEADER, s->init_buf->data, 5, s, s->msg_callback_arg);
616                         s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
617                         }
618                 }
619
620         return ret;
621         }
622
623 static int ssl23_get_server_hello(SSL *s)
624         {
625         char buf[8];
626         unsigned char *p;
627         int i;
628         int n;
629
630         n=ssl23_read_bytes(s,7);
631
632         if (n != 7) return(n);
633         p=s->packet;
634
635         memcpy(buf,p,n);
636
637         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
638                 (p[5] == 0x00) && (p[6] == 0x02))
639                 {
640 #ifdef OPENSSL_NO_SSL2
641                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
642                 goto err;
643 #else
644                 /* we are talking sslv2 */
645                 /* we need to clean up the SSLv3 setup and put in the
646                  * sslv2 stuff. */
647                 int ch_len;
648
649                 if (s->options & SSL_OP_NO_SSLv2)
650                         {
651                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
652                         goto err;
653                         }
654                 if (s->s2 == NULL)
655                         {
656                         if (!ssl2_new(s))
657                                 goto err;
658                         }
659                 else
660                         ssl2_clear(s);
661
662                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
663                         ch_len=SSL2_CHALLENGE_LENGTH;
664                 else
665                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
666
667                 /* write out sslv2 challenge */
668                 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because
669                    it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or
670                    SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for
671                    futurproofing */
672                 i=(SSL3_RANDOM_SIZE < ch_len)
673                         ?SSL3_RANDOM_SIZE:ch_len;
674                 s->s2->challenge_length=i;
675                 memcpy(s->s2->challenge,
676                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
677
678                 if (s->s3 != NULL) ssl3_free(s);
679
680                 if (!BUF_MEM_grow_clean(s->init_buf,
681                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
682                         {
683                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
684                         goto err;
685                         }
686
687                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
688                 if (!(s->client_version == SSL2_VERSION))
689                         /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
690                         s->s2->ssl2_rollback=1;
691
692                 /* setup the 7 bytes we have read so we get them from
693                  * the sslv2 buffer */
694                 s->rstate=SSL_ST_READ_HEADER;
695                 s->packet_length=n;
696                 s->packet= &(s->s2->rbuf[0]);
697                 memcpy(s->packet,buf,n);
698                 s->s2->rbuf_left=n;
699                 s->s2->rbuf_offs=0;
700
701                 /* we have already written one */
702                 s->s2->write_sequence=1;
703
704                 s->method=SSLv2_client_method();
705                 s->handshake_func=s->method->ssl_connect;
706 #endif
707                 }
708         else if (p[1] == SSL3_VERSION_MAJOR &&
709                  p[2] <= TLS1_2_VERSION_MINOR &&
710                  ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
711                   (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2)))
712                 {
713                 /* we have sslv3 or tls1 (server hello or alert) */
714
715                 if ((p[2] == SSL3_VERSION_MINOR) &&
716                         !(s->options & SSL_OP_NO_SSLv3))
717                         {
718 #ifdef OPENSSL_FIPS
719                         if(FIPS_mode())
720                                 {
721                                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
722                                         SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
723                                 goto err;
724                                 }
725 #endif
726                         s->version=SSL3_VERSION;
727                         s->method=SSLv3_client_method();
728                         }
729                 else if ((p[2] == TLS1_VERSION_MINOR) &&
730                         !(s->options & SSL_OP_NO_TLSv1))
731                         {
732                         s->version=TLS1_VERSION;
733                         s->method=TLSv1_client_method();
734                         }
735                 else if ((p[2] == TLS1_1_VERSION_MINOR) &&
736                         !(s->options & SSL_OP_NO_TLSv1_1))
737                         {
738                         s->version=TLS1_1_VERSION;
739                         s->method=TLSv1_1_client_method();
740                         }
741                 else if ((p[2] == TLS1_2_VERSION_MINOR) &&
742                         !(s->options & SSL_OP_NO_TLSv1_2))
743                         {
744                         s->version=TLS1_2_VERSION;
745                         s->method=TLSv1_2_client_method();
746                         }
747                 else
748                         {
749                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
750                         goto err;
751                         }
752
753                 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING)
754                         {
755                         /* fatal alert */
756
757                         void (*cb)(const SSL *ssl,int type,int val)=NULL;
758                         int j;
759
760                         if (s->info_callback != NULL)
761                                 cb=s->info_callback;
762                         else if (s->ctx->info_callback != NULL)
763                                 cb=s->ctx->info_callback;
764  
765                         i=p[5];
766                         if (cb != NULL)
767                                 {
768                                 j=(i<<8)|p[6];
769                                 cb(s,SSL_CB_READ_ALERT,j);
770                                 }
771                         
772                         if (s->msg_callback)
773                                 {
774                                 s->msg_callback(0, s->version, SSL3_RT_HEADER, p, 5, s, s->msg_callback_arg);
775                                 s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg);
776                                 }
777
778                         s->rwstate=SSL_NOTHING;
779                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
780                         goto err;
781                         }
782
783                 if (!ssl_init_wbio_buffer(s,1)) goto err;
784
785                 /* we are in this state */
786                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
787
788                 /* put the 7 bytes we have read into the input buffer
789                  * for SSLv3 */
790                 s->rstate=SSL_ST_READ_HEADER;
791                 s->packet_length=n;
792                 if (s->s3->rbuf.buf == NULL)
793                         if (!ssl3_setup_read_buffer(s))
794                                 goto err;
795                 s->packet= &(s->s3->rbuf.buf[0]);
796                 memcpy(s->packet,buf,n);
797                 s->s3->rbuf.left=n;
798                 s->s3->rbuf.offset=0;
799
800                 s->handshake_func=s->method->ssl_connect;
801                 }
802         else
803                 {
804                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
805                 goto err;
806                 }
807         s->init_num=0;
808
809         /* Since, if we are sending a ssl23 client hello, we are not
810          * reusing a session-id */
811         if (!ssl_get_new_session(s,0))
812                 goto err;
813
814         return(SSL_connect(s));
815 err:
816         return(-1);
817         }