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 if (!ssl3_init_finished_mac(s)) {
208 ret = -1;
209 goto end;
210 }
211
212 s->state = SSL23_ST_CW_CLNT_HELLO_A;
213 s->ctx->stats.sess_connect++;
214 s->init_num = 0;
215 break;
216
217 case SSL23_ST_CW_CLNT_HELLO_A:
218 case SSL23_ST_CW_CLNT_HELLO_B:
219
220 s->shutdown = 0;
221 ret = ssl23_client_hello(s);
222 if (ret <= 0)
223 goto end;
224 s->state = SSL23_ST_CR_SRVR_HELLO_A;
225 s->init_num = 0;
226
227 break;
228
229 case SSL23_ST_CR_SRVR_HELLO_A:
230 case SSL23_ST_CR_SRVR_HELLO_B:
231 ret = ssl23_get_server_hello(s);
232 if (ret >= 0)
233 cb = NULL;
234 goto end;
235 /* break; */
236
237 default:
238 SSLerr(SSL_F_SSL23_CONNECT, SSL_R_UNKNOWN_STATE);
239 ret = -1;
240 goto end;
241 /* break; */
242 }
243
244 if (s->debug) {
245 (void)BIO_flush(s->wbio);
246 }
247
248 if ((cb != NULL) && (s->state != state)) {
249 new_state = s->state;
250 s->state = state;
251 cb(s, SSL_CB_CONNECT_LOOP, 1);
252 s->state = new_state;
253 }
254 }
255 end:
256 s->in_handshake--;
257 if (buf != NULL)
258 BUF_MEM_free(buf);
259 if (cb != NULL)
260 cb(s, SSL_CB_CONNECT_EXIT, ret);
261 return (ret);
262 }
263
ssl23_no_ssl2_ciphers(SSL * s)264 static int ssl23_no_ssl2_ciphers(SSL *s)
265 {
266 SSL_CIPHER *cipher;
267 STACK_OF(SSL_CIPHER) *ciphers;
268 int i;
269 ciphers = SSL_get_ciphers(s);
270 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
271 cipher = sk_SSL_CIPHER_value(ciphers, i);
272 if (cipher->algorithm_ssl == SSL_SSLV2)
273 return 0;
274 }
275 return 1;
276 }
277
278 /*
279 * Fill a ClientRandom or ServerRandom field of length len. Returns <= 0 on
280 * failure, 1 on success.
281 */
ssl_fill_hello_random(SSL * s,int server,unsigned char * result,int len)282 int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len)
283 {
284 int send_time = 0;
285 if (len < 4)
286 return 0;
287 if (server)
288 send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0;
289 else
290 send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0;
291 if (send_time) {
292 unsigned long Time = (unsigned long)time(NULL);
293 unsigned char *p = result;
294 l2n(Time, p);
295 return RAND_bytes(p, len - 4);
296 } else
297 return RAND_bytes(result, len);
298 }
299
ssl23_client_hello(SSL * s)300 static int ssl23_client_hello(SSL *s)
301 {
302 unsigned char *buf;
303 unsigned char *p, *d;
304 int i, ch_len;
305 unsigned long l;
306 int ssl2_compat;
307 int version = 0, version_major, version_minor;
308 int al = 0;
309 #ifndef OPENSSL_NO_COMP
310 int j;
311 SSL_COMP *comp;
312 #endif
313 int ret;
314 unsigned long mask, options = s->options;
315
316 ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1;
317
318 if (ssl2_compat && ssl23_no_ssl2_ciphers(s))
319 ssl2_compat = 0;
320
321 /*
322 * SSL_OP_NO_X disables all protocols above X *if* there are
323 * some protocols below X enabled. This is required in order
324 * to maintain "version capability" vector contiguous. So
325 * that if application wants to disable TLS1.0 in favour of
326 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the
327 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2.
328 */
329 mask = SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1
330 #if !defined(OPENSSL_NO_SSL3)
331 | SSL_OP_NO_SSLv3
332 #endif
333 #if !defined(OPENSSL_NO_SSL2)
334 | (ssl2_compat ? SSL_OP_NO_SSLv2 : 0)
335 #endif
336 ;
337 #if !defined(OPENSSL_NO_TLS1_2_CLIENT)
338 version = TLS1_2_VERSION;
339
340 if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask)
341 version = TLS1_1_VERSION;
342 #else
343 version = TLS1_1_VERSION;
344 #endif
345 mask &= ~SSL_OP_NO_TLSv1_1;
346 if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
347 version = TLS1_VERSION;
348 mask &= ~SSL_OP_NO_TLSv1;
349 #if !defined(OPENSSL_NO_SSL3)
350 if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
351 version = SSL3_VERSION;
352 mask &= ~SSL_OP_NO_SSLv3;
353 #endif
354 #if !defined(OPENSSL_NO_SSL2)
355 if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask)
356 version = SSL2_VERSION;
357 #endif
358
359 #ifndef OPENSSL_NO_TLSEXT
360 if (version != SSL2_VERSION) {
361 /*
362 * have to disable SSL 2.0 compatibility if we need TLS extensions
363 */
364
365 if (s->tlsext_hostname != NULL)
366 ssl2_compat = 0;
367 if (s->tlsext_status_type != -1)
368 ssl2_compat = 0;
369 # ifdef TLSEXT_TYPE_opaque_prf_input
370 if (s->ctx->tlsext_opaque_prf_input_callback != 0
371 || s->tlsext_opaque_prf_input != NULL)
372 ssl2_compat = 0;
373 # endif
374 if (s->cert->cli_ext.meths_count != 0)
375 ssl2_compat = 0;
376 }
377 #endif
378
379 buf = (unsigned char *)s->init_buf->data;
380 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) {
381 /*
382 * Since we're sending s23 client hello, we're not reusing a session, as
383 * we'd be using the method from the saved session instead
384 */
385 if (!ssl_get_new_session(s, 0)) {
386 return -1;
387 }
388
389 p = s->s3->client_random;
390 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
391 return -1;
392
393 if (version == TLS1_2_VERSION) {
394 version_major = TLS1_2_VERSION_MAJOR;
395 version_minor = TLS1_2_VERSION_MINOR;
396 } else if (tls1_suiteb(s)) {
397 SSLerr(SSL_F_SSL23_CLIENT_HELLO,
398 SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
399 return -1;
400 } else if (version == TLS1_1_VERSION) {
401 version_major = TLS1_1_VERSION_MAJOR;
402 version_minor = TLS1_1_VERSION_MINOR;
403 } else if (version == TLS1_VERSION) {
404 version_major = TLS1_VERSION_MAJOR;
405 version_minor = TLS1_VERSION_MINOR;
406 }
407 #ifdef OPENSSL_FIPS
408 else if (FIPS_mode()) {
409 SSLerr(SSL_F_SSL23_CLIENT_HELLO,
410 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
411 return -1;
412 }
413 #endif
414 else if (version == SSL3_VERSION) {
415 version_major = SSL3_VERSION_MAJOR;
416 version_minor = SSL3_VERSION_MINOR;
417 } else if (version == SSL2_VERSION) {
418 version_major = SSL2_VERSION_MAJOR;
419 version_minor = SSL2_VERSION_MINOR;
420 } else {
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 /* create SSL 2.0 compatible Client Hello */
429
430 /* two byte record header will be written last */
431 d = &(buf[2]);
432 p = d + 9; /* leave space for message type, version,
433 * 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 /* no ciphers */
443 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
444 return -1;
445 }
446 s2n(i, d);
447 p += i;
448
449 /*
450 * put in the session-id length (zero since there is no reuse)
451 */
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 /*
461 * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it
462 * is one of SSL2_MAX_CHALLENGE_LENGTH (32) or
463 * SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for
464 * futurproofing
465 */
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_bytes (&(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i)
473 <= 0)
474 return -1;
475
476 memcpy(p, &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i);
477 p += i;
478
479 i = p - &(buf[2]);
480 buf[0] = ((i >> 8) & 0xff) | 0x80;
481 buf[1] = (i & 0xff);
482
483 /* number of bytes to write */
484 s->init_num = i + 2;
485 s->init_off = 0;
486
487 ssl3_finish_mac(s, &(buf[2]), i);
488 } else {
489 /* create Client Hello in SSL 3.0/TLS 1.0 format */
490
491 /*
492 * do the record header (5 bytes) and handshake message header (4
493 * bytes) last
494 */
495 d = p = &(buf[9]);
496
497 *(p++) = version_major;
498 *(p++) = version_minor;
499
500 /* Random stuff */
501 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
502 p += SSL3_RANDOM_SIZE;
503
504 /* Session ID (zero since there is no reuse) */
505 *(p++) = 0;
506
507 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
508 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]),
509 ssl3_put_cipher_by_char);
510 if (i == 0) {
511 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
512 return -1;
513 }
514 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
515 /*
516 * Some servers hang if client hello > 256 bytes as hack
517 * workaround chop number of supported ciphers to keep it well
518 * below this if we use TLS v1.2
519 */
520 if (TLS1_get_version(s) >= TLS1_2_VERSION
521 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
522 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
523 #endif
524 s2n(i, p);
525 p += i;
526
527 /* COMPRESSION */
528 #ifdef OPENSSL_NO_COMP
529 *(p++) = 1;
530 #else
531 if ((s->options & SSL_OP_NO_COMPRESSION)
532 || !s->ctx->comp_methods)
533 j = 0;
534 else
535 j = sk_SSL_COMP_num(s->ctx->comp_methods);
536 *(p++) = 1 + j;
537 for (i = 0; i < j; i++) {
538 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
539 *(p++) = comp->id;
540 }
541 #endif
542 *(p++) = 0; /* Add the NULL method */
543
544 #ifndef OPENSSL_NO_TLSEXT
545 /* TLS extensions */
546 if (ssl_prepare_clienthello_tlsext(s) <= 0) {
547 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
548 return -1;
549 }
550 if ((p =
551 ssl_add_clienthello_tlsext(s, p,
552 buf + SSL3_RT_MAX_PLAIN_LENGTH,
553 &al)) == NULL) {
554 ssl3_send_alert(s, SSL3_AL_FATAL, al);
555 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
556 return -1;
557 }
558 #endif
559
560 l = p - d;
561
562 /* fill in 4-byte handshake header */
563 d = &(buf[5]);
564 *(d++) = SSL3_MT_CLIENT_HELLO;
565 l2n3(l, d);
566
567 l += 4;
568
569 if (l > SSL3_RT_MAX_PLAIN_LENGTH) {
570 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
571 return -1;
572 }
573
574 /* fill in 5-byte record header */
575 d = buf;
576 *(d++) = SSL3_RT_HANDSHAKE;
577 *(d++) = version_major;
578 /*
579 * Some servers hang if we use long client hellos and a record
580 * number > TLS 1.0.
581 */
582 if (TLS1_get_client_version(s) > TLS1_VERSION)
583 *(d++) = 1;
584 else
585 *(d++) = version_minor;
586 s2n((int)l, d);
587
588 /* number of bytes to write */
589 s->init_num = p - buf;
590 s->init_off = 0;
591
592 ssl3_finish_mac(s, &(buf[5]), s->init_num - 5);
593 }
594
595 s->state = SSL23_ST_CW_CLNT_HELLO_B;
596 s->init_off = 0;
597 }
598
599 /* SSL3_ST_CW_CLNT_HELLO_B */
600 ret = ssl23_write_bytes(s);
601
602 if ((ret >= 2) && s->msg_callback) {
603 /* Client Hello has been sent; tell msg_callback */
604
605 if (ssl2_compat)
606 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data + 2,
607 ret - 2, s, s->msg_callback_arg);
608 else {
609 s->msg_callback(1, version, SSL3_RT_HEADER, s->init_buf->data, 5,
610 s, s->msg_callback_arg);
611 s->msg_callback(1, version, SSL3_RT_HANDSHAKE,
612 s->init_buf->data + 5, ret - 5, s,
613 s->msg_callback_arg);
614 }
615 }
616
617 return ret;
618 }
619
ssl23_get_server_hello(SSL * s)620 static int ssl23_get_server_hello(SSL *s)
621 {
622 char buf[8];
623 unsigned char *p;
624 int i;
625 int n;
626
627 n = ssl23_read_bytes(s, 7);
628
629 if (n != 7)
630 return (n);
631 p = s->packet;
632
633 memcpy(buf, p, n);
634
635 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
636 (p[5] == 0x00) && (p[6] == 0x02)) {
637 #ifdef OPENSSL_NO_SSL2
638 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
639 goto err;
640 #else
641 /* we are talking sslv2 */
642 /*
643 * we need to clean up the SSLv3 setup and put in the sslv2 stuff.
644 */
645 int ch_len;
646
647 if (s->options & SSL_OP_NO_SSLv2) {
648 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
649 goto err;
650 }
651 if (s->s2 == NULL) {
652 if (!ssl2_new(s))
653 goto err;
654 } else
655 ssl2_clear(s);
656
657 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
658 ch_len = SSL2_CHALLENGE_LENGTH;
659 else
660 ch_len = SSL2_MAX_CHALLENGE_LENGTH;
661
662 /* write out sslv2 challenge */
663 /*
664 * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it is
665 * one of SSL2_MAX_CHALLENGE_LENGTH (32) or SSL2_MAX_CHALLENGE_LENGTH
666 * (16), but leave the check in for futurproofing
667 */
668 i = (SSL3_RANDOM_SIZE < ch_len)
669 ? SSL3_RANDOM_SIZE : ch_len;
670 s->s2->challenge_length = i;
671 memcpy(s->s2->challenge,
672 &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i);
673
674 if (s->s3 != NULL)
675 ssl3_free(s);
676
677 if (!BUF_MEM_grow_clean(s->init_buf,
678 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) {
679 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, ERR_R_BUF_LIB);
680 goto err;
681 }
682
683 s->state = SSL2_ST_GET_SERVER_HELLO_A;
684 if (!(s->client_version == SSL2_VERSION))
685 /*
686 * use special padding (SSL 3.0 draft/RFC 2246, App. E.2)
687 */
688 s->s2->ssl2_rollback = 1;
689
690 /*
691 * setup the 7 bytes we have read so we get them from the sslv2
692 * buffer
693 */
694 s->rstate = SSL_ST_READ_HEADER;
695 s->packet_length = n;
696 s->packet = &(s->s2->rbuf[0]);
697 memcpy(s->packet, buf, n);
698 s->s2->rbuf_left = n;
699 s->s2->rbuf_offs = 0;
700
701 /* we have already written one */
702 s->s2->write_sequence = 1;
703
704 s->method = SSLv2_client_method();
705 s->handshake_func = s->method->ssl_connect;
706 #endif
707 } else if (p[1] == SSL3_VERSION_MAJOR &&
708 p[2] <= TLS1_2_VERSION_MINOR &&
709 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
710 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) {
711 /* we have sslv3 or tls1 (server hello or alert) */
712
713 #ifndef OPENSSL_NO_SSL3
714 if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) {
715 # ifdef OPENSSL_FIPS
716 if (FIPS_mode()) {
717 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
718 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
719 goto err;
720 }
721 # endif
722 s->version = SSL3_VERSION;
723 s->method = SSLv3_client_method();
724 } else
725 #endif
726 if ((p[2] == TLS1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1)) {
727 s->version = TLS1_VERSION;
728 s->method = TLSv1_client_method();
729 } else if ((p[2] == TLS1_1_VERSION_MINOR) &&
730 !(s->options & SSL_OP_NO_TLSv1_1)) {
731 s->version = TLS1_1_VERSION;
732 s->method = TLSv1_1_client_method();
733 } else if ((p[2] == TLS1_2_VERSION_MINOR) &&
734 !(s->options & SSL_OP_NO_TLSv1_2)) {
735 s->version = TLS1_2_VERSION;
736 s->method = TLSv1_2_client_method();
737 } else {
738 /*
739 * Unrecognised version, we'll send a protocol version alert using
740 * our preferred version.
741 */
742 switch(s->client_version) {
743 default:
744 /*
745 * Shouldn't happen
746 * Fall through
747 */
748 case TLS1_2_VERSION:
749 s->version = TLS1_2_VERSION;
750 s->method = TLSv1_2_client_method();
751 break;
752 case TLS1_1_VERSION:
753 s->version = TLS1_1_VERSION;
754 s->method = TLSv1_1_client_method();
755 break;
756 case TLS1_VERSION:
757 s->version = TLS1_VERSION;
758 s->method = TLSv1_client_method();
759 break;
760 #ifndef OPENSSL_NO_SSL3
761 case SSL3_VERSION:
762 s->version = SSL3_VERSION;
763 s->method = SSLv3_client_method();
764 break;
765 #endif
766 }
767 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
768 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_PROTOCOL_VERSION);
769 goto err;
770 }
771
772 s->session->ssl_version = s->version;
773
774 /* ensure that TLS_MAX_VERSION is up-to-date */
775 OPENSSL_assert(s->version <= TLS_MAX_VERSION);
776
777 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) {
778 /* fatal alert */
779
780 void (*cb) (const SSL *ssl, int type, int val) = NULL;
781 int j;
782
783 if (s->info_callback != NULL)
784 cb = s->info_callback;
785 else if (s->ctx->info_callback != NULL)
786 cb = s->ctx->info_callback;
787
788 i = p[5];
789 if (cb != NULL) {
790 j = (i << 8) | p[6];
791 cb(s, SSL_CB_READ_ALERT, j);
792 }
793
794 if (s->msg_callback) {
795 s->msg_callback(0, s->version, SSL3_RT_HEADER, p, 5, s,
796 s->msg_callback_arg);
797 s->msg_callback(0, s->version, SSL3_RT_ALERT, p + 5, 2, s,
798 s->msg_callback_arg);
799 }
800
801 s->rwstate = SSL_NOTHING;
802 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_AD_REASON_OFFSET + p[6]);
803 goto err;
804 }
805
806 if (!ssl_init_wbio_buffer(s, 1))
807 goto err;
808
809 /* we are in this state */
810 s->state = SSL3_ST_CR_SRVR_HELLO_A;
811
812 /*
813 * put the 7 bytes we have read into the input buffer for SSLv3
814 */
815 s->rstate = SSL_ST_READ_HEADER;
816 s->packet_length = n;
817 if (s->s3->rbuf.buf == NULL)
818 if (!ssl3_setup_read_buffer(s))
819 goto err;
820 s->packet = &(s->s3->rbuf.buf[0]);
821 memcpy(s->packet, buf, n);
822 s->s3->rbuf.left = n;
823 s->s3->rbuf.offset = 0;
824
825 s->handshake_func = s->method->ssl_connect;
826 } else {
827 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNKNOWN_PROTOCOL);
828 goto err;
829 }
830 s->init_num = 0;
831
832 return (SSL_connect(s));
833 err:
834 return (-1);
835 }
836