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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
119static const SSL_METHOD *ssl23_get_client_method(int ver);
120static int ssl23_client_hello(SSL *s);
121static int ssl23_get_server_hello(SSL *s);
122static const SSL_METHOD
123*ssl23_get_client_method(int ver)
124{
125#ifndef OPENSSL_NO_SSL2
126 if (ver == SSL2_VERSION)
127 return (SSLv2_client_method());
128#endif
129 if (ver == SSL3_VERSION)
130 return (SSLv3_client_method());
131 else if (ver == TLS1_VERSION)
132 return (TLSv1_client_method());
133 else if (ver == TLS1_1_VERSION)
134 return (TLSv1_1_client_method());
135 else if (ver == TLS1_2_VERSION)
136 return (TLSv1_2_client_method());
137 else
138 return (NULL);
139}
140
141IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
142 ssl_undefined_function, ssl23_connect, ssl23_get_client_method)
143
144int
145ssl23_connect(SSL *s)
146{
147 BUF_MEM *buf = NULL;
148 void (*cb)(const SSL *ssl, int type, int val) = NULL;
149 int ret = -1;
150 int new_state, state;
151
152 ERR_clear_error();
153 errno = 0;
154
155 if (s->info_callback != NULL)
156 cb = s->info_callback;
157 else if (s->ctx->info_callback != NULL)
158 cb = s->ctx->info_callback;
159
160 s->in_handshake++;
161 if (!SSL_in_init(s) || SSL_in_before(s))
162 SSL_clear(s);
163
164 for (;;) {
165 state = s->state;
166
167 switch (s->state) {
168 case SSL_ST_BEFORE:
169 case SSL_ST_CONNECT:
170 case SSL_ST_BEFORE|SSL_ST_CONNECT:
171 case SSL_ST_OK|SSL_ST_CONNECT:
172
173 if (s->session != NULL) {
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)
180 cb(s, SSL_CB_HANDSHAKE_START, 1);
181
182 /* s->version=TLS1_VERSION; */
183 s->type = SSL_ST_CONNECT;
184
185 if (s->init_buf == NULL) {
186 if ((buf = BUF_MEM_new()) == NULL) {
187 ret = -1;
188 goto end;
189 }
190 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
191 ret = -1;
192 goto end;
193 }
194 s->init_buf = buf;
195 buf = NULL;
196 }
197
198 if (!ssl3_setup_buffers(s)) {
199 ret = -1;
200 goto end;
201 }
202
203 ssl3_init_finished_mac(s);
204
205 s->state = SSL23_ST_CW_CLNT_HELLO_A;
206 s->ctx->stats.sess_connect++;
207 s->init_num = 0;
208 break;
209
210 case SSL23_ST_CW_CLNT_HELLO_A:
211 case SSL23_ST_CW_CLNT_HELLO_B:
212
213 s->shutdown = 0;
214 ret = ssl23_client_hello(s);
215 if (ret <= 0)
216 goto end;
217 s->state = SSL23_ST_CR_SRVR_HELLO_A;
218 s->init_num = 0;
219
220 break;
221
222 case SSL23_ST_CR_SRVR_HELLO_A:
223 case SSL23_ST_CR_SRVR_HELLO_B:
224 ret = ssl23_get_server_hello(s);
225 if (ret >= 0)
226 cb = NULL;
227 goto end;
228 /* break; */
229
230 default:
231 SSLerr(SSL_F_SSL23_CONNECT, SSL_R_UNKNOWN_STATE);
232 ret = -1;
233 goto end;
234 /* break; */
235 }
236
237 if (s->debug) {
238 (void)BIO_flush(s->wbio);
239 }
240
241 if ((cb != NULL) && (s->state != state)) {
242 new_state = s->state;
243 s->state = state;
244 cb(s, SSL_CB_CONNECT_LOOP, 1);
245 s->state = new_state;
246 }
247 }
248end:
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
257static int
258ssl23_no_ssl2_ciphers(SSL *s)
259{
260 SSL_CIPHER *cipher;
261 STACK_OF(SSL_CIPHER) *ciphers;
262 int i;
263 ciphers = SSL_get_ciphers(s);
264 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
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. */
274int
275ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len)
276{
277 int send_time = 0;
278
279 if (len < 4)
280 return 0;
281 if (server)
282 send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0;
283 else
284 send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0;
285 if (send_time) {
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 } else
291 return RAND_pseudo_bytes(result, len);
292}
293
294static int
295ssl23_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 /* have to disable SSL 2.0 compatibility if we need TLS extensions */
356
357 if (s->tlsext_hostname != NULL)
358 ssl2_compat = 0;
359 if (s->tlsext_status_type != -1)
360 ssl2_compat = 0;
361#ifdef TLSEXT_TYPE_opaque_prf_input
362 if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL)
363 ssl2_compat = 0;
364#endif
365 }
366#endif
367
368 buf = (unsigned char *)s->init_buf->data;
369 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) {
370#if 0
371 /* don't reuse session-id's */
372 if (!ssl_get_new_session(s, 0)) {
373 return (-1);
374 }
375#endif
376
377 p = s->s3->client_random;
378 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
379 return -1;
380
381 if (version == TLS1_2_VERSION) {
382 version_major = TLS1_2_VERSION_MAJOR;
383 version_minor = TLS1_2_VERSION_MINOR;
384 } else if (version == TLS1_1_VERSION) {
385 version_major = TLS1_1_VERSION_MAJOR;
386 version_minor = TLS1_1_VERSION_MINOR;
387 } else if (version == TLS1_VERSION) {
388 version_major = TLS1_VERSION_MAJOR;
389 version_minor = TLS1_VERSION_MINOR;
390 }
391#ifdef OPENSSL_FIPS
392 else if (FIPS_mode()) {
393 SSLerr(SSL_F_SSL23_CLIENT_HELLO,
394 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
395 return -1;
396 }
397#endif
398 else if (version == SSL3_VERSION) {
399 version_major = SSL3_VERSION_MAJOR;
400 version_minor = SSL3_VERSION_MINOR;
401 } else if (version == SSL2_VERSION) {
402 version_major = SSL2_VERSION_MAJOR;
403 version_minor = SSL2_VERSION_MINOR;
404 } else {
405 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_PROTOCOLS_AVAILABLE);
406 return (-1);
407 }
408
409 s->client_version = version;
410
411 if (ssl2_compat) {
412 /* create SSL 2.0 compatible Client Hello */
413
414 /* two byte record header will be written last */
415 d = &(buf[2]);
416 p = d + 9; /* leave space for message type, version, individual length fields */
417
418 *(d++) = SSL2_MT_CLIENT_HELLO;
419 *(d++) = version_major;
420 *(d++) = version_minor;
421
422 /* Ciphers supported */
423 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), p, 0);
424 if (i == 0) {
425 /* no ciphers */
426 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
427 return -1;
428 }
429 s2n(i, d);
430 p += i;
431
432 /* put in the session-id length (zero since there is no reuse) */
433#if 0
434 s->session->session_id_length = 0;
435#endif
436 s2n(0, d);
437
438 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
439 ch_len = SSL2_CHALLENGE_LENGTH;
440 else
441 ch_len = SSL2_MAX_CHALLENGE_LENGTH;
442
443 /* write out sslv2 challenge */
444 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32),
445 because it is one of SSL2_MAX_CHALLENGE_LENGTH (32)
446 or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the
447 check in for futurproofing */
448 if (SSL3_RANDOM_SIZE < ch_len)
449 i = SSL3_RANDOM_SIZE;
450 else
451 i = ch_len;
452 s2n(i, d);
453 memset(&(s->s3->client_random[0]), 0, SSL3_RANDOM_SIZE);
454 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i) <= 0)
455 return -1;
456
457 memcpy(p, &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i);
458 p += i;
459
460 i = p- &(buf[2]);
461 buf[0] = ((i >> 8)&0xff)|0x80;
462 buf[1] = (i&0xff);
463
464 /* number of bytes to write */
465 s->init_num = i + 2;
466 s->init_off = 0;
467
468 ssl3_finish_mac(s, &(buf[2]), i);
469 } else {
470 /* create Client Hello in SSL 3.0/TLS 1.0 format */
471
472 /* do the record header (5 bytes) and handshake message header (4 bytes) last */
473 d = p = &(buf[9]);
474
475 *(p++) = version_major;
476 *(p++) = version_minor;
477
478 /* Random stuff */
479 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
480 p += SSL3_RANDOM_SIZE;
481
482 /* Session ID (zero since there is no reuse) */
483 *(p++) = 0;
484
485 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
486 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), ssl3_put_cipher_by_char);
487 if (i == 0) {
488 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
489 return -1;
490 }
491#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
492 /* Some servers hang if client hello > 256 bytes
493 * as hack workaround chop number of supported ciphers
494 * to keep it well below this if we use TLS v1.2
495 */
496 if (TLS1_get_version(s) >= TLS1_2_VERSION &&
497 i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
498 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
499#endif
500 s2n(i, p);
501 p += i;
502
503 /* COMPRESSION */
504#ifdef OPENSSL_NO_COMP
505 *(p++) = 1;
506#else
507 if ((s->options & SSL_OP_NO_COMPRESSION) ||
508 !s->ctx->comp_methods)
509 j = 0;
510 else
511 j = sk_SSL_COMP_num(s->ctx->comp_methods);
512 *(p++) = 1 + j;
513 for (i = 0; i < j; i++) {
514 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
515 *(p++) = comp->id;
516 }
517#endif
518 *(p++)=0; /* Add the NULL method */
519
520#ifndef OPENSSL_NO_TLSEXT
521 /* TLS extensions*/
522 if (ssl_prepare_clienthello_tlsext(s) <= 0) {
523 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
524 return -1;
525 }
526 if ((p = ssl_add_clienthello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) {
527 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
528 return -1;
529 }
530#endif
531
532 l = p - d;
533
534 /* fill in 4-byte handshake header */
535 d = &(buf[5]);
536 *(d++) = SSL3_MT_CLIENT_HELLO;
537 l2n3(l, d);
538
539 l += 4;
540
541 if (l > SSL3_RT_MAX_PLAIN_LENGTH) {
542 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
543 return -1;
544 }
545
546 /* fill in 5-byte record header */
547 d = buf;
548 *(d++) = SSL3_RT_HANDSHAKE;
549 *(d++) = version_major;
550 /* Some servers hang if we use long client hellos
551 * and a record number > TLS 1.0.
552 */
553 if (TLS1_get_client_version(s) > TLS1_VERSION)
554 *(d++) = 1;
555 else
556 *(d++) = version_minor;
557 s2n((int)l, d);
558
559 /* number of bytes to write */
560 s->init_num = p - buf;
561 s->init_off = 0;
562
563 ssl3_finish_mac(s, &(buf[5]), s->init_num - 5);
564 }
565
566 s->state = SSL23_ST_CW_CLNT_HELLO_B;
567 s->init_off = 0;
568 }
569
570 /* SSL3_ST_CW_CLNT_HELLO_B */
571 ret = ssl23_write_bytes(s);
572
573 if ((ret >= 2) && s->msg_callback) {
574 /* Client Hello has been sent; tell msg_callback */
575
576 if (ssl2_compat)
577 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data + 2, ret - 2, s, s->msg_callback_arg);
578 else
579 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data + 5, ret - 5, s, s->msg_callback_arg);
580 }
581
582 return ret;
583}
584
585static int
586ssl23_get_server_hello(SSL *s)
587{
588 char buf[8];
589 unsigned char *p;
590 int i;
591 int n;
592
593 n = ssl23_read_bytes(s, 7);
594
595 if (n != 7)
596 return (n);
597 p = s->packet;
598
599 memcpy(buf, p, n);
600
601 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
602 (p[5] == 0x00) && (p[6] == 0x02)) {
603#ifdef OPENSSL_NO_SSL2
604 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
605 goto err;
606#else
607 /* we are talking sslv2 */
608 /* we need to clean up the SSLv3 setup and put in the
609 * sslv2 stuff. */
610 int ch_len;
611
612 if (s->options & SSL_OP_NO_SSLv2) {
613 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
614 goto err;
615 }
616 if (s->s2 == NULL) {
617 if (!ssl2_new(s))
618 goto err;
619 } else
620 ssl2_clear(s);
621
622 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
623 ch_len = SSL2_CHALLENGE_LENGTH;
624 else
625 ch_len = SSL2_MAX_CHALLENGE_LENGTH;
626
627 /* write out sslv2 challenge */
628 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because
629 it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or
630 SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for
631 futurproofing */
632 i = (SSL3_RANDOM_SIZE < ch_len) ? SSL3_RANDOM_SIZE : ch_len;
633 s->s2->challenge_length = i;
634 memcpy(s->s2->challenge,
635 &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i);
636
637 if (s->s3 != NULL)
638 ssl3_free(s);
639
640 if (!BUF_MEM_grow_clean(s->init_buf,
641 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) {
642 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, ERR_R_BUF_LIB);
643 goto err;
644 }
645
646 s->state = SSL2_ST_GET_SERVER_HELLO_A;
647 if (!(s->client_version == SSL2_VERSION))
648 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
649 s->s2->ssl2_rollback = 1;
650
651 /* setup the 7 bytes we have read so we get them from
652 * the sslv2 buffer */
653 s->rstate = SSL_ST_READ_HEADER;
654 s->packet_length = n;
655 s->packet = &(s->s2->rbuf[0]);
656 memcpy(s->packet, buf, n);
657 s->s2->rbuf_left = n;
658 s->s2->rbuf_offs = 0;
659
660 /* we have already written one */
661 s->s2->write_sequence = 1;
662
663 s->method = SSLv2_client_method();
664 s->handshake_func = s->method->ssl_connect;
665#endif
666 } else if (p[1] == SSL3_VERSION_MAJOR &&
667 p[2] <= TLS1_2_VERSION_MINOR &&
668 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
669 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) {
670 /* we have sslv3 or tls1 (server hello or alert) */
671
672 if ((p[2] == SSL3_VERSION_MINOR) &&
673 !(s->options & SSL_OP_NO_SSLv3)) {
674#ifdef OPENSSL_FIPS
675 if (FIPS_mode()) {
676 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
677 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
678 goto err;
679 }
680#endif
681 s->version = SSL3_VERSION;
682 s->method = SSLv3_client_method();
683 } else if ((p[2] == TLS1_VERSION_MINOR) &&
684 !(s->options & SSL_OP_NO_TLSv1)) {
685 s->version = TLS1_VERSION;
686 s->method = TLSv1_client_method();
687 } else if ((p[2] == TLS1_1_VERSION_MINOR) &&
688 !(s->options & SSL_OP_NO_TLSv1_1)) {
689 s->version = TLS1_1_VERSION;
690 s->method = TLSv1_1_client_method();
691 } else if ((p[2] == TLS1_2_VERSION_MINOR) &&
692 !(s->options & SSL_OP_NO_TLSv1_2)) {
693 s->version = TLS1_2_VERSION;
694 s->method = TLSv1_2_client_method();
695 } else {
696 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
697 goto err;
698 }
699
700 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) {
701 /* fatal alert */
702
703 void (*cb)(const SSL *ssl, int type, int val) = NULL;
704 int j;
705
706 if (s->info_callback != NULL)
707 cb = s->info_callback;
708 else if (s->ctx->info_callback != NULL)
709 cb = s->ctx->info_callback;
710
711 i = p[5];
712 if (cb != NULL) {
713 j = (i << 8) | p[6];
714 cb(s, SSL_CB_READ_ALERT, j);
715 }
716
717 if (s->msg_callback)
718 s->msg_callback(0, s->version, SSL3_RT_ALERT, p + 5, 2, s, s->msg_callback_arg);
719
720 s->rwstate = SSL_NOTHING;
721 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_AD_REASON_OFFSET + p[6]);
722 goto err;
723 }
724
725 if (!ssl_init_wbio_buffer(s, 1))
726 goto err;
727
728 /* we are in this state */
729 s->state = SSL3_ST_CR_SRVR_HELLO_A;
730
731 /* put the 7 bytes we have read into the input buffer
732 * for SSLv3 */
733 s->rstate = SSL_ST_READ_HEADER;
734 s->packet_length = n;
735 if (s->s3->rbuf.buf == NULL)
736 if (!ssl3_setup_read_buffer(s))
737 goto err;
738 s->packet = &(s->s3->rbuf.buf[0]);
739 memcpy(s->packet, buf, n);
740 s->s3->rbuf.left = n;
741 s->s3->rbuf.offset = 0;
742
743 s->handshake_func = s->method->ssl_connect;
744 } else {
745 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNKNOWN_PROTOCOL);
746 goto err;
747 }
748 s->init_num = 0;
749
750 /* Since, if we are sending a ssl23 client hello, we are not
751 * reusing a session-id */
752 if (!ssl_get_new_session(s, 0))
753 goto err;
754
755 return (SSL_connect(s));
756err:
757 return (-1);
758}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-11 23:22:16 +0000