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