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
278 if (len < 4)
279 return 0;
280 if (server)
281 send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0;
282 else
283 send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0;
284 if (send_time)
285 {
286 unsigned long Time = (unsigned long)time(NULL);
287 unsigned char *p = result;
288 l2n(Time, p);
289 return RAND_pseudo_bytes(p, len-4);
290 }
291 else
292 return RAND_pseudo_bytes(result, len);
293 }
294
295 static int ssl23_client_hello(SSL *s)
296 {
297 unsigned char *buf;
298 unsigned char *p,*d;
299 int i,ch_len;
300 unsigned long l;
301 int ssl2_compat;
302 int version = 0, version_major, version_minor;
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 }
367 #endif
368
369 buf=(unsigned char *)s->init_buf->data;
370 if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
371 {
372 #if 0
373 /* don't reuse session-id's */
374 if (!ssl_get_new_session(s,0))
375 {
376 return(-1);
377 }
378 #endif
379
380 p=s->s3->client_random;
381 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
382 return -1;
383
384 if (version == TLS1_2_VERSION)
385 {
386 version_major = TLS1_2_VERSION_MAJOR;
387 version_minor = TLS1_2_VERSION_MINOR;
388 }
389 else if (version == TLS1_1_VERSION)
390 {
391 version_major = TLS1_1_VERSION_MAJOR;
392 version_minor = TLS1_1_VERSION_MINOR;
393 }
394 else if (version == TLS1_VERSION)
395 {
396 version_major = TLS1_VERSION_MAJOR;
397 version_minor = TLS1_VERSION_MINOR;
398 }
399 #ifdef OPENSSL_FIPS
400 else if(FIPS_mode())
401 {
402 SSLerr(SSL_F_SSL23_CLIENT_HELLO,
403 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
404 return -1;
405 }
406 #endif
407 else if (version == SSL3_VERSION)
408 {
409 version_major = SSL3_VERSION_MAJOR;
410 version_minor = SSL3_VERSION_MINOR;
411 }
412 else if (version == SSL2_VERSION)
413 {
414 version_major = SSL2_VERSION_MAJOR;
415 version_minor = SSL2_VERSION_MINOR;
416 }
417 else
418 {
419 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
420 return(-1);
421 }
422
423 s->client_version = version;
424
425 if (ssl2_compat)
426 {
427 /* create SSL 2.0 compatible Client Hello */
428
429 /* two byte record header will be written last */
430 d = &(buf[2]);
431 p = d + 9; /* leave space for message type, version, individual length fields */
432
433 *(d++) = SSL2_MT_CLIENT_HELLO;
434 *(d++) = version_major;
435 *(d++) = version_minor;
436
437 /* Ciphers supported */
438 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
439 if (i == 0)
440 {
441 /* no ciphers */
442 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
443 return -1;
444 }
445 s2n(i,d);
446 p+=i;
447
448 /* put in the session-id length (zero since there is no reuse) */
449 #if 0
450 s->session->session_id_length=0;
451 #endif
452 s2n(0,d);
453
454 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
455 ch_len=SSL2_CHALLENGE_LENGTH;
456 else
457 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
458
459 /* write out sslv2 challenge */
460 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32),
461 because it is one of SSL2_MAX_CHALLENGE_LENGTH (32)
462 or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the
463 check in for futurproofing */
464 if (SSL3_RANDOM_SIZE < ch_len)
465 i=SSL3_RANDOM_SIZE;
466 else
467 i=ch_len;
468 s2n(i,d);
469 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
470 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
471 return -1;
472
473 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
474 p+=i;
475
476 i= p- &(buf[2]);
477 buf[0]=((i>>8)&0xff)|0x80;
478 buf[1]=(i&0xff);
479
480 /* number of bytes to write */
481 s->init_num=i+2;
482 s->init_off=0;
483
484 ssl3_finish_mac(s,&(buf[2]),i);
485 }
486 else
487 {
488 /* create Client Hello in SSL 3.0/TLS 1.0 format */
489
490 /* do the record header (5 bytes) and handshake message header (4 bytes) last */
491 d = p = &(buf[9]);
492
493 *(p++) = version_major;
494 *(p++) = version_minor;
495
496 /* Random stuff */
497 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
498 p += SSL3_RANDOM_SIZE;
499
500 /* Session ID (zero since there is no reuse) */
501 *(p++) = 0;
502
503 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
504 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
505 if (i == 0)
506 {
507 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
508 return -1;
509 }
510 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
511 /* Some servers hang if client hello > 256 bytes
512 * as hack workaround chop number of supported ciphers
513 * to keep it well below this if we use TLS v1.2
514 */
515 if (TLS1_get_version(s) >= TLS1_2_VERSION
516 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
517 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
518 #endif
519 s2n(i,p);
520 p+=i;
521
522 /* COMPRESSION */
523 #ifdef OPENSSL_NO_COMP
524 *(p++)=1;
525 #else
526 if ((s->options & SSL_OP_NO_COMPRESSION)
527 || !s->ctx->comp_methods)
528 j=0;
529 else
530 j=sk_SSL_COMP_num(s->ctx->comp_methods);
531 *(p++)=1+j;
532 for (i=0; i<j; i++)
533 {
534 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
535 *(p++)=comp->id;
536 }
537 #endif
538 *(p++)=0; /* Add the NULL method */
539
540 #ifndef OPENSSL_NO_TLSEXT
541 /* TLS extensions*/
542 if (ssl_prepare_clienthello_tlsext(s) <= 0)
543 {
544 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
545 return -1;
546 }
547 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
548 {
549 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
550 return -1;
551 }
552 #endif
553
554 l = p-d;
555
556 /* fill in 4-byte handshake header */
557 d=&(buf[5]);
558 *(d++)=SSL3_MT_CLIENT_HELLO;
559 l2n3(l,d);
560
561 l += 4;
562
563 if (l > SSL3_RT_MAX_PLAIN_LENGTH)
564 {
565 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
566 return -1;
567 }
568
569 /* fill in 5-byte record header */
570 d=buf;
571 *(d++) = SSL3_RT_HANDSHAKE;
572 *(d++) = version_major;
573 /* Some servers hang if we use long client hellos
574 * and a record number > TLS 1.0.
575 */
576 if (TLS1_get_client_version(s) > TLS1_VERSION)
577 *(d++) = 1;
578 else
579 *(d++) = version_minor;
580 s2n((int)l,d);
581
582 /* number of bytes to write */
583 s->init_num=p-buf;
584 s->init_off=0;
585
586 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
587 }
588
589 s->state=SSL23_ST_CW_CLNT_HELLO_B;
590 s->init_off=0;
591 }
592
593 /* SSL3_ST_CW_CLNT_HELLO_B */
594 ret = ssl23_write_bytes(s);
595
596 if ((ret >= 2) && s->msg_callback)
597 {
598 /* Client Hello has been sent; tell msg_callback */
599
600 if (ssl2_compat)
601 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
602 else
603 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
604 }
605
606 return ret;
607 }
608
609 static int ssl23_get_server_hello(SSL *s)
610 {
611 char buf[8];
612 unsigned char *p;
613 int i;
614 int n;
615
616 n=ssl23_read_bytes(s,7);
617
618 if (n != 7) return(n);
619 p=s->packet;
620
621 memcpy(buf,p,n);
622
623 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
624 (p[5] == 0x00) && (p[6] == 0x02))
625 {
626 #ifdef OPENSSL_NO_SSL2
627 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
628 goto err;
629 #else
630 /* we are talking sslv2 */
631 /* we need to clean up the SSLv3 setup and put in the
632 * sslv2 stuff. */
633 int ch_len;
634
635 if (s->options & SSL_OP_NO_SSLv2)
636 {
637 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
638 goto err;
639 }
640 if (s->s2 == NULL)
641 {
642 if (!ssl2_new(s))
643 goto err;
644 }
645 else
646 ssl2_clear(s);
647
648 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
649 ch_len=SSL2_CHALLENGE_LENGTH;
650 else
651 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
652
653 /* write out sslv2 challenge */
654 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because
655 it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or
656 SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for
657 futurproofing */
658 i=(SSL3_RANDOM_SIZE < ch_len)
659 ?SSL3_RANDOM_SIZE:ch_len;
660 s->s2->challenge_length=i;
661 memcpy(s->s2->challenge,
662 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
663
664 if (s->s3 != NULL) ssl3_free(s);
665
666 if (!BUF_MEM_grow_clean(s->init_buf,
667 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
668 {
669 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
670 goto err;
671 }
672
673 s->state=SSL2_ST_GET_SERVER_HELLO_A;
674 if (!(s->client_version == SSL2_VERSION))
675 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
676 s->s2->ssl2_rollback=1;
677
678 /* setup the 7 bytes we have read so we get them from
679 * the sslv2 buffer */
680 s->rstate=SSL_ST_READ_HEADER;
681 s->packet_length=n;
682 s->packet= &(s->s2->rbuf[0]);
683 memcpy(s->packet,buf,n);
684 s->s2->rbuf_left=n;
685 s->s2->rbuf_offs=0;
686
687 /* we have already written one */
688 s->s2->write_sequence=1;
689
690 s->method=SSLv2_client_method();
691 s->handshake_func=s->method->ssl_connect;
692 #endif
693 }
694 else if (p[1] == SSL3_VERSION_MAJOR &&
695 p[2] <= TLS1_2_VERSION_MINOR &&
696 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
697 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2)))
698 {
699 /* we have sslv3 or tls1 (server hello or alert) */
700
701 if ((p[2] == SSL3_VERSION_MINOR) &&
702 !(s->options & SSL_OP_NO_SSLv3))
703 {
704 #ifdef OPENSSL_FIPS
705 if(FIPS_mode())
706 {
707 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
708 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
709 goto err;
710 }
711 #endif
712 s->version=SSL3_VERSION;
713 s->method=SSLv3_client_method();
714 }
715 else if ((p[2] == TLS1_VERSION_MINOR) &&
716 !(s->options & SSL_OP_NO_TLSv1))
717 {
718 s->version=TLS1_VERSION;
719 s->method=TLSv1_client_method();
720 }
721 else if ((p[2] == TLS1_1_VERSION_MINOR) &&
722 !(s->options & SSL_OP_NO_TLSv1_1))
723 {
724 s->version=TLS1_1_VERSION;
725 s->method=TLSv1_1_client_method();
726 }
727 else if ((p[2] == TLS1_2_VERSION_MINOR) &&
728 !(s->options & SSL_OP_NO_TLSv1_2))
729 {
730 s->version=TLS1_2_VERSION;
731 s->method=TLSv1_2_client_method();
732 }
733 else
734 {
735 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
736 goto err;
737 }
738
739 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING)
740 {
741 /* fatal alert */
742
743 void (*cb)(const SSL *ssl,int type,int val)=NULL;
744 int j;
745
746 if (s->info_callback != NULL)
747 cb=s->info_callback;
748 else if (s->ctx->info_callback != NULL)
749 cb=s->ctx->info_callback;
750
751 i=p[5];
752 if (cb != NULL)
753 {
754 j=(i<<8)|p[6];
755 cb(s,SSL_CB_READ_ALERT,j);
756 }
757
758 if (s->msg_callback)
759 s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg);
760
761 s->rwstate=SSL_NOTHING;
762 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
763 goto err;
764 }
765
766 if (!ssl_init_wbio_buffer(s,1)) goto err;
767
768 /* we are in this state */
769 s->state=SSL3_ST_CR_SRVR_HELLO_A;
770
771 /* put the 7 bytes we have read into the input buffer
772 * for SSLv3 */
773 s->rstate=SSL_ST_READ_HEADER;
774 s->packet_length=n;
775 if (s->s3->rbuf.buf == NULL)
776 if (!ssl3_setup_read_buffer(s))
777 goto err;
778 s->packet= &(s->s3->rbuf.buf[0]);
779 memcpy(s->packet,buf,n);
780 s->s3->rbuf.left=n;
781 s->s3->rbuf.offset=0;
782
783 s->handshake_func=s->method->ssl_connect;
784 }
785 else
786 {
787 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
788 goto err;
789 }
790 s->init_num=0;
791
792 /* Since, if we are sending a ssl23 client hello, we are not
793 * reusing a session-id */
794 if (!ssl_get_new_session(s,0))
795 goto err;
796
797 return(SSL_connect(s));
798 err:
799 return(-1);
800 }