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, ssl23_get_client_method)
145
146 int ssl23_connect(SSL *s)
147 {
148 BUF_MEM *buf = NULL;
149 unsigned long Time = (unsigned long)time(NULL);
150 void (*cb) (const SSL *ssl, int type, int val) = NULL;
151 int ret = -1;
152 int new_state, state;
153
154 RAND_add(&Time, sizeof(Time), 0);
155 ERR_clear_error();
156 clear_sys_error();
157
158 if (s->info_callback != NULL)
159 cb = s->info_callback;
160 else if (s->ctx->info_callback != NULL)
161 cb = s->ctx->info_callback;
162
163 s->in_handshake++;
164 if (!SSL_in_init(s) || SSL_in_before(s))
165 SSL_clear(s);
166
167 for (;;) {
168 state = s->state;
169
170 switch (s->state) {
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 SSLerr(SSL_F_SSL23_CONNECT,
178 SSL_R_SSL23_DOING_SESSION_ID_REUSE);
179 ret = -1;
180 goto end;
181 }
182 s->server = 0;
183 if (cb != NULL)
184 cb(s, SSL_CB_HANDSHAKE_START, 1);
185
186 /* s->version=TLS1_VERSION; */
187 s->type = SSL_ST_CONNECT;
188
189 if (s->init_buf == NULL) {
190 if ((buf = BUF_MEM_new()) == NULL) {
191 ret = -1;
192 goto end;
193 }
194 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
195 ret = -1;
196 goto end;
197 }
198 s->init_buf = buf;
199 buf = NULL;
200 }
201
202 if (!ssl3_setup_buffers(s)) {
203 ret = -1;
204 goto end;
205 }
206
207 ssl3_init_finished_mac(s);
208
209 s->state = SSL23_ST_CW_CLNT_HELLO_A;
210 s->ctx->stats.sess_connect++;
211 s->init_num = 0;
212 break;
213
214 case SSL23_ST_CW_CLNT_HELLO_A:
215 case SSL23_ST_CW_CLNT_HELLO_B:
216
217 s->shutdown = 0;
218 ret = ssl23_client_hello(s);
219 if (ret <= 0)
220 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)
230 cb = NULL;
231 goto end;
232 /* break; */
233
234 default:
235 SSLerr(SSL_F_SSL23_CONNECT, SSL_R_UNKNOWN_STATE);
236 ret = -1;
237 goto end;
238 /* break; */
239 }
240
241 if (s->debug) {
242 (void)BIO_flush(s->wbio);
243 }
244
245 if ((cb != NULL) && (s->state != state)) {
246 new_state = s->state;
247 s->state = state;
248 cb(s, SSL_CB_CONNECT_LOOP, 1);
249 s->state = new_state;
250 }
251 }
252 end:
253 s->in_handshake--;
254 if (buf != NULL)
255 BUF_MEM_free(buf);
256 if (cb != NULL)
257 cb(s, SSL_CB_CONNECT_EXIT, ret);
258 return (ret);
259 }
260
ssl23_no_ssl2_ciphers(SSL * s)261 static int ssl23_no_ssl2_ciphers(SSL *s)
262 {
263 SSL_CIPHER *cipher;
264 STACK_OF(SSL_CIPHER) *ciphers;
265 int i;
266 ciphers = SSL_get_ciphers(s);
267 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
268 cipher = sk_SSL_CIPHER_value(ciphers, i);
269 if (cipher->algorithm_ssl == SSL_SSLV2)
270 return 0;
271 }
272 return 1;
273 }
274
275 /*
276 * Fill a ClientRandom or ServerRandom field of length len. Returns <= 0 on
277 * failure, 1 on success.
278 */
ssl_fill_hello_random(SSL * s,int server,unsigned char * result,int len)279 int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len)
280 {
281 int send_time = 0;
282 if (len < 4)
283 return 0;
284 if (server)
285 send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0;
286 else
287 send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0;
288 if (send_time) {
289 unsigned long Time = (unsigned long)time(NULL);
290 unsigned char *p = result;
291 l2n(Time, p);
292 return RAND_pseudo_bytes(p, len - 4);
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 int al = 0;
306 #ifndef OPENSSL_NO_COMP
307 int j;
308 SSL_COMP *comp;
309 #endif
310 int ret;
311 unsigned long mask, options = s->options;
312
313 ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1;
314
315 if (ssl2_compat && ssl23_no_ssl2_ciphers(s))
316 ssl2_compat = 0;
317
318 /*
319 * SSL_OP_NO_X disables all protocols above X *if* there are
320 * some protocols below X enabled. This is required in order
321 * to maintain "version capability" vector contiguous. So
322 * that if application wants to disable TLS1.0 in favour of
323 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the
324 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2.
325 */
326 mask = SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1
327 #if !defined(OPENSSL_NO_SSL3)
328 | SSL_OP_NO_SSLv3
329 #endif
330 #if !defined(OPENSSL_NO_SSL2)
331 | (ssl2_compat ? SSL_OP_NO_SSLv2 : 0)
332 #endif
333 ;
334 #if !defined(OPENSSL_NO_TLS1_2_CLIENT)
335 version = TLS1_2_VERSION;
336
337 if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask)
338 version = TLS1_1_VERSION;
339 #else
340 version = TLS1_1_VERSION;
341 #endif
342 mask &= ~SSL_OP_NO_TLSv1_1;
343 if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
344 version = TLS1_VERSION;
345 mask &= ~SSL_OP_NO_TLSv1;
346 #if !defined(OPENSSL_NO_SSL3)
347 if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
348 version = SSL3_VERSION;
349 mask &= ~SSL_OP_NO_SSLv3;
350 #endif
351 #if !defined(OPENSSL_NO_SSL2)
352 if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask)
353 version = SSL2_VERSION;
354 #endif
355
356 #ifndef OPENSSL_NO_TLSEXT
357 if (version != SSL2_VERSION) {
358 /*
359 * have to disable SSL 2.0 compatibility if we need TLS extensions
360 */
361
362 if (s->tlsext_hostname != NULL)
363 ssl2_compat = 0;
364 if (s->tlsext_status_type != -1)
365 ssl2_compat = 0;
366 # ifdef TLSEXT_TYPE_opaque_prf_input
367 if (s->ctx->tlsext_opaque_prf_input_callback != 0
368 || s->tlsext_opaque_prf_input != NULL)
369 ssl2_compat = 0;
370 # endif
371 if (s->cert->cli_ext.meths_count != 0)
372 ssl2_compat = 0;
373 }
374 #endif
375
376 buf = (unsigned char *)s->init_buf->data;
377 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) {
378 /*
379 * Since we're sending s23 client hello, we're not reusing a session, as
380 * we'd be using the method from the saved session instead
381 */
382 if (!ssl_get_new_session(s, 0)) {
383 return -1;
384 }
385
386 p = s->s3->client_random;
387 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
388 return -1;
389
390 if (version == TLS1_2_VERSION) {
391 version_major = TLS1_2_VERSION_MAJOR;
392 version_minor = TLS1_2_VERSION_MINOR;
393 } else if (tls1_suiteb(s)) {
394 SSLerr(SSL_F_SSL23_CLIENT_HELLO,
395 SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
396 return -1;
397 } else if (version == TLS1_1_VERSION) {
398 version_major = TLS1_1_VERSION_MAJOR;
399 version_minor = TLS1_1_VERSION_MINOR;
400 } else if (version == TLS1_VERSION) {
401 version_major = TLS1_VERSION_MAJOR;
402 version_minor = TLS1_VERSION_MINOR;
403 }
404 #ifdef OPENSSL_FIPS
405 else if (FIPS_mode()) {
406 SSLerr(SSL_F_SSL23_CLIENT_HELLO,
407 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
408 return -1;
409 }
410 #endif
411 else if (version == SSL3_VERSION) {
412 version_major = SSL3_VERSION_MAJOR;
413 version_minor = SSL3_VERSION_MINOR;
414 } else if (version == SSL2_VERSION) {
415 version_major = SSL2_VERSION_MAJOR;
416 version_minor = SSL2_VERSION_MINOR;
417 } else {
418 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_PROTOCOLS_AVAILABLE);
419 return (-1);
420 }
421
422 s->client_version = version;
423
424 if (ssl2_compat) {
425 /* create SSL 2.0 compatible Client Hello */
426
427 /* two byte record header will be written last */
428 d = &(buf[2]);
429 p = d + 9; /* leave space for message type, version,
430 * individual length fields */
431
432 *(d++) = SSL2_MT_CLIENT_HELLO;
433 *(d++) = version_major;
434 *(d++) = version_minor;
435
436 /* Ciphers supported */
437 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), p, 0);
438 if (i == 0) {
439 /* no ciphers */
440 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
441 return -1;
442 }
443 s2n(i, d);
444 p += i;
445
446 /*
447 * put in the session-id length (zero since there is no reuse)
448 */
449 s2n(0, d);
450
451 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
452 ch_len = SSL2_CHALLENGE_LENGTH;
453 else
454 ch_len = SSL2_MAX_CHALLENGE_LENGTH;
455
456 /* write out sslv2 challenge */
457 /*
458 * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it
459 * is one of SSL2_MAX_CHALLENGE_LENGTH (32) or
460 * SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for
461 * futurproofing
462 */
463 if (SSL3_RANDOM_SIZE < ch_len)
464 i = SSL3_RANDOM_SIZE;
465 else
466 i = ch_len;
467 s2n(i, d);
468 memset(&(s->s3->client_random[0]), 0, SSL3_RANDOM_SIZE);
469 if (RAND_pseudo_bytes
470 (&(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 } else {
486 /* create Client Hello in SSL 3.0/TLS 1.0 format */
487
488 /*
489 * do the record header (5 bytes) and handshake message header (4
490 * bytes) last
491 */
492 d = p = &(buf[9]);
493
494 *(p++) = version_major;
495 *(p++) = version_minor;
496
497 /* Random stuff */
498 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
499 p += SSL3_RANDOM_SIZE;
500
501 /* Session ID (zero since there is no reuse) */
502 *(p++) = 0;
503
504 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
505 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]),
506 ssl3_put_cipher_by_char);
507 if (i == 0) {
508 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
509 return -1;
510 }
511 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
512 /*
513 * Some servers hang if client hello > 256 bytes as hack
514 * workaround chop number of supported ciphers to keep it well
515 * 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 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
536 *(p++) = comp->id;
537 }
538 #endif
539 *(p++) = 0; /* Add the NULL method */
540
541 #ifndef OPENSSL_NO_TLSEXT
542 /* TLS extensions */
543 if (ssl_prepare_clienthello_tlsext(s) <= 0) {
544 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
545 return -1;
546 }
547 if ((p =
548 ssl_add_clienthello_tlsext(s, p,
549 buf + SSL3_RT_MAX_PLAIN_LENGTH,
550 &al)) == NULL) {
551 ssl3_send_alert(s, SSL3_AL_FATAL, al);
552 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
553 return -1;
554 }
555 #endif
556
557 l = p - d;
558
559 /* fill in 4-byte handshake header */
560 d = &(buf[5]);
561 *(d++) = SSL3_MT_CLIENT_HELLO;
562 l2n3(l, d);
563
564 l += 4;
565
566 if (l > SSL3_RT_MAX_PLAIN_LENGTH) {
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 /*
576 * Some servers hang if we use long client hellos and a record
577 * number > TLS 1.0.
578 */
579 if (TLS1_get_client_version(s) > TLS1_VERSION)
580 *(d++) = 1;
581 else
582 *(d++) = version_minor;
583 s2n((int)l, d);
584
585 /* number of bytes to write */
586 s->init_num = p - buf;
587 s->init_off = 0;
588
589 ssl3_finish_mac(s, &(buf[5]), s->init_num - 5);
590 }
591
592 s->state = SSL23_ST_CW_CLNT_HELLO_B;
593 s->init_off = 0;
594 }
595
596 /* SSL3_ST_CW_CLNT_HELLO_B */
597 ret = ssl23_write_bytes(s);
598
599 if ((ret >= 2) && s->msg_callback) {
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,
604 ret - 2, s, s->msg_callback_arg);
605 else {
606 s->msg_callback(1, version, SSL3_RT_HEADER, s->init_buf->data, 5,
607 s, s->msg_callback_arg);
608 s->msg_callback(1, version, SSL3_RT_HANDSHAKE,
609 s->init_buf->data + 5, ret - 5, s,
610 s->msg_callback_arg);
611 }
612 }
613
614 return ret;
615 }
616
ssl23_get_server_hello(SSL * s)617 static int ssl23_get_server_hello(SSL *s)
618 {
619 char buf[8];
620 unsigned char *p;
621 int i;
622 int n;
623
624 n = ssl23_read_bytes(s, 7);
625
626 if (n != 7)
627 return (n);
628 p = s->packet;
629
630 memcpy(buf, p, n);
631
632 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
633 (p[5] == 0x00) && (p[6] == 0x02)) {
634 #ifdef OPENSSL_NO_SSL2
635 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
636 goto err;
637 #else
638 /* we are talking sslv2 */
639 /*
640 * we need to clean up the SSLv3 setup and put in the sslv2 stuff.
641 */
642 int ch_len;
643
644 if (s->options & SSL_OP_NO_SSLv2) {
645 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
646 goto err;
647 }
648 if (s->s2 == NULL) {
649 if (!ssl2_new(s))
650 goto err;
651 } else
652 ssl2_clear(s);
653
654 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
655 ch_len = SSL2_CHALLENGE_LENGTH;
656 else
657 ch_len = SSL2_MAX_CHALLENGE_LENGTH;
658
659 /* write out sslv2 challenge */
660 /*
661 * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it is
662 * one of SSL2_MAX_CHALLENGE_LENGTH (32) or SSL2_MAX_CHALLENGE_LENGTH
663 * (16), but leave the check in for futurproofing
664 */
665 i = (SSL3_RANDOM_SIZE < ch_len)
666 ? SSL3_RANDOM_SIZE : ch_len;
667 s->s2->challenge_length = i;
668 memcpy(s->s2->challenge,
669 &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i);
670
671 if (s->s3 != NULL)
672 ssl3_free(s);
673
674 if (!BUF_MEM_grow_clean(s->init_buf,
675 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) {
676 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, ERR_R_BUF_LIB);
677 goto err;
678 }
679
680 s->state = SSL2_ST_GET_SERVER_HELLO_A;
681 if (!(s->client_version == SSL2_VERSION))
682 /*
683 * use special padding (SSL 3.0 draft/RFC 2246, App. E.2)
684 */
685 s->s2->ssl2_rollback = 1;
686
687 /*
688 * setup the 7 bytes we have read so we get them from the sslv2
689 * buffer
690 */
691 s->rstate = SSL_ST_READ_HEADER;
692 s->packet_length = n;
693 s->packet = &(s->s2->rbuf[0]);
694 memcpy(s->packet, buf, n);
695 s->s2->rbuf_left = n;
696 s->s2->rbuf_offs = 0;
697
698 /* we have already written one */
699 s->s2->write_sequence = 1;
700
701 s->method = SSLv2_client_method();
702 s->handshake_func = s->method->ssl_connect;
703 #endif
704 } else if (p[1] == SSL3_VERSION_MAJOR &&
705 p[2] <= TLS1_2_VERSION_MINOR &&
706 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
707 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) {
708 /* we have sslv3 or tls1 (server hello or alert) */
709
710 #ifndef OPENSSL_NO_SSL3
711 if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) {
712 # ifdef OPENSSL_FIPS
713 if (FIPS_mode()) {
714 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
715 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
716 goto err;
717 }
718 # endif
719 s->version = SSL3_VERSION;
720 s->method = SSLv3_client_method();
721 } else
722 #endif
723 if ((p[2] == TLS1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1)) {
724 s->version = TLS1_VERSION;
725 s->method = TLSv1_client_method();
726 } else if ((p[2] == TLS1_1_VERSION_MINOR) &&
727 !(s->options & SSL_OP_NO_TLSv1_1)) {
728 s->version = TLS1_1_VERSION;
729 s->method = TLSv1_1_client_method();
730 } else if ((p[2] == TLS1_2_VERSION_MINOR) &&
731 !(s->options & SSL_OP_NO_TLSv1_2)) {
732 s->version = TLS1_2_VERSION;
733 s->method = TLSv1_2_client_method();
734 } else {
735 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
736 goto err;
737 }
738
739 s->session->ssl_version = s->version;
740
741 /* ensure that TLS_MAX_VERSION is up-to-date */
742 OPENSSL_assert(s->version <= TLS_MAX_VERSION);
743
744 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) {
745 /* fatal alert */
746
747 void (*cb) (const SSL *ssl, int type, int val) = NULL;
748 int j;
749
750 if (s->info_callback != NULL)
751 cb = s->info_callback;
752 else if (s->ctx->info_callback != NULL)
753 cb = s->ctx->info_callback;
754
755 i = p[5];
756 if (cb != NULL) {
757 j = (i << 8) | p[6];
758 cb(s, SSL_CB_READ_ALERT, j);
759 }
760
761 if (s->msg_callback) {
762 s->msg_callback(0, s->version, SSL3_RT_HEADER, p, 5, s,
763 s->msg_callback_arg);
764 s->msg_callback(0, s->version, SSL3_RT_ALERT, p + 5, 2, s,
765 s->msg_callback_arg);
766 }
767
768 s->rwstate = SSL_NOTHING;
769 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_AD_REASON_OFFSET + p[6]);
770 goto err;
771 }
772
773 if (!ssl_init_wbio_buffer(s, 1))
774 goto err;
775
776 /* we are in this state */
777 s->state = SSL3_ST_CR_SRVR_HELLO_A;
778
779 /*
780 * put the 7 bytes we have read into the input buffer for SSLv3
781 */
782 s->rstate = SSL_ST_READ_HEADER;
783 s->packet_length = n;
784 if (s->s3->rbuf.buf == NULL)
785 if (!ssl3_setup_read_buffer(s))
786 goto err;
787 s->packet = &(s->s3->rbuf.buf[0]);
788 memcpy(s->packet, buf, n);
789 s->s3->rbuf.left = n;
790 s->s3->rbuf.offset = 0;
791
792 s->handshake_func = s->method->ssl_connect;
793 } else {
794 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNKNOWN_PROTOCOL);
795 goto err;
796 }
797 s->init_num = 0;
798
799 return (SSL_connect(s));
800 err:
801 return (-1);
802 }
803