Line data Source code
1 : /* ssl/s23_clnt.c */
2 : /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 : * All rights reserved.
4 : *
5 : * This package is an SSL implementation written
6 : * by Eric Young (eay@cryptsoft.com).
7 : * The implementation was written so as to conform with Netscapes SSL.
8 : *
9 : * This library is free for commercial and non-commercial use as long as
10 : * the following conditions are aheared to. The following conditions
11 : * apply to all code found in this distribution, be it the RC4, RSA,
12 : * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 : * included with this distribution is covered by the same copyright terms
14 : * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 : *
16 : * Copyright remains Eric Young's, and as such any Copyright notices in
17 : * the code are not to be removed.
18 : * If this package is used in a product, Eric Young should be given attribution
19 : * as the author of the parts of the library used.
20 : * This can be in the form of a textual message at program startup or
21 : * in documentation (online or textual) provided with the package.
22 : *
23 : * Redistribution and use in source and binary forms, with or without
24 : * modification, are permitted provided that the following conditions
25 : * are met:
26 : * 1. Redistributions of source code must retain the copyright
27 : * notice, this list of conditions and the following disclaimer.
28 : * 2. Redistributions in binary form must reproduce the above copyright
29 : * notice, this list of conditions and the following disclaimer in the
30 : * documentation and/or other materials provided with the distribution.
31 : * 3. All advertising materials mentioning features or use of this software
32 : * must display the following acknowledgement:
33 : * "This product includes cryptographic software written by
34 : * Eric Young (eay@cryptsoft.com)"
35 : * The word 'cryptographic' can be left out if the rouines from the library
36 : * being used are not cryptographic related :-).
37 : * 4. If you include any Windows specific code (or a derivative thereof) from
38 : * the apps directory (application code) you must include an acknowledgement:
39 : * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 : *
41 : * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 : * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 : * SUCH DAMAGE.
52 : *
53 : * The licence and distribution terms for any publically available version or
54 : * derivative of this code cannot be changed. i.e. this code cannot simply be
55 : * copied and put under another distribution licence
56 : * [including the GNU Public Licence.]
57 : */
58 : /* ====================================================================
59 : * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
60 : *
61 : * Redistribution and use in source and binary forms, with or without
62 : * modification, are permitted provided that the following conditions
63 : * are met:
64 : *
65 : * 1. Redistributions of source code must retain the above copyright
66 : * notice, this list of conditions and the following disclaimer.
67 : *
68 : * 2. Redistributions in binary form must reproduce the above copyright
69 : * notice, this list of conditions and the following disclaimer in
70 : * the documentation and/or other materials provided with the
71 : * distribution.
72 : *
73 : * 3. All advertising materials mentioning features or use of this
74 : * software must display the following acknowledgment:
75 : * "This product includes software developed by the OpenSSL Project
76 : * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 : *
78 : * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 : * endorse or promote products derived from this software without
80 : * prior written permission. For written permission, please contact
81 : * openssl-core@openssl.org.
82 : *
83 : * 5. Products derived from this software may not be called "OpenSSL"
84 : * nor may "OpenSSL" appear in their names without prior written
85 : * permission of the OpenSSL Project.
86 : *
87 : * 6. Redistributions of any form whatsoever must retain the following
88 : * acknowledgment:
89 : * "This product includes software developed by the OpenSSL Project
90 : * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 : *
92 : * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 : * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 : * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 : * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 : * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 : * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 : * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 : * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 : * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 : * OF THE POSSIBILITY OF SUCH DAMAGE.
104 : * ====================================================================
105 : *
106 : * This product includes cryptographic software written by Eric Young
107 : * (eay@cryptsoft.com). This product includes software written by Tim
108 : * Hudson (tjh@cryptsoft.com).
109 : *
110 : */
111 :
112 : #include <stdio.h>
113 : #include "ssl_locl.h"
114 : #include <openssl/buffer.h>
115 : #include <openssl/rand.h>
116 : #include <openssl/objects.h>
117 : #include <openssl/evp.h>
118 :
119 : static const SSL_METHOD *ssl23_get_client_method(int ver);
120 : static int ssl23_client_hello(SSL *s);
121 : static int ssl23_get_server_hello(SSL *s);
122 0 : static const SSL_METHOD *ssl23_get_client_method(int ver)
123 : {
124 : #ifndef OPENSSL_NO_SSL2
125 0 : if (ver == SSL2_VERSION)
126 0 : return (SSLv2_client_method());
127 : #endif
128 : #ifndef OPENSSL_NO_SSL3
129 0 : if (ver == SSL3_VERSION)
130 0 : return (SSLv3_client_method());
131 : #endif
132 0 : if (ver == TLS1_VERSION)
133 0 : return (TLSv1_client_method());
134 0 : else if (ver == TLS1_1_VERSION)
135 0 : return (TLSv1_1_client_method());
136 0 : else if (ver == TLS1_2_VERSION)
137 0 : return (TLSv1_2_client_method());
138 : else
139 : return (NULL);
140 : }
141 :
142 0 : IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
143 : ssl_undefined_function,
144 : ssl23_connect, ssl23_get_client_method)
145 :
146 0 : int ssl23_connect(SSL *s)
147 : {
148 : BUF_MEM *buf = NULL;
149 0 : 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 0 : RAND_add(&Time, sizeof(Time), 0);
155 0 : ERR_clear_error();
156 0 : clear_sys_error();
157 :
158 0 : if (s->info_callback != NULL)
159 : cb = s->info_callback;
160 0 : else if (s->ctx->info_callback != NULL)
161 : cb = s->ctx->info_callback;
162 :
163 0 : s->in_handshake++;
164 0 : if (!SSL_in_init(s) || SSL_in_before(s))
165 0 : SSL_clear(s);
166 :
167 : for (;;) {
168 0 : state = s->state;
169 :
170 0 : 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 0 : if (s->session != NULL) {
177 0 : SSLerr(SSL_F_SSL23_CONNECT,
178 : SSL_R_SSL23_DOING_SESSION_ID_REUSE);
179 : ret = -1;
180 0 : goto end;
181 : }
182 0 : s->server = 0;
183 0 : if (cb != NULL)
184 0 : cb(s, SSL_CB_HANDSHAKE_START, 1);
185 :
186 : /* s->version=TLS1_VERSION; */
187 0 : s->type = SSL_ST_CONNECT;
188 :
189 0 : if (s->init_buf == NULL) {
190 0 : if ((buf = BUF_MEM_new()) == NULL) {
191 : ret = -1;
192 : goto end;
193 : }
194 0 : if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
195 : ret = -1;
196 : goto end;
197 : }
198 0 : s->init_buf = buf;
199 : buf = NULL;
200 : }
201 :
202 0 : if (!ssl3_setup_buffers(s)) {
203 : ret = -1;
204 : goto end;
205 : }
206 :
207 0 : ssl3_init_finished_mac(s);
208 :
209 0 : s->state = SSL23_ST_CW_CLNT_HELLO_A;
210 0 : s->ctx->stats.sess_connect++;
211 0 : s->init_num = 0;
212 0 : break;
213 :
214 : case SSL23_ST_CW_CLNT_HELLO_A:
215 : case SSL23_ST_CW_CLNT_HELLO_B:
216 :
217 0 : s->shutdown = 0;
218 0 : ret = ssl23_client_hello(s);
219 0 : if (ret <= 0)
220 : goto end;
221 0 : s->state = SSL23_ST_CR_SRVR_HELLO_A;
222 0 : s->init_num = 0;
223 :
224 0 : break;
225 :
226 : case SSL23_ST_CR_SRVR_HELLO_A:
227 : case SSL23_ST_CR_SRVR_HELLO_B:
228 0 : ret = ssl23_get_server_hello(s);
229 0 : if (ret >= 0)
230 : cb = NULL;
231 : goto end;
232 : /* break; */
233 :
234 : default:
235 0 : SSLerr(SSL_F_SSL23_CONNECT, SSL_R_UNKNOWN_STATE);
236 : ret = -1;
237 0 : goto end;
238 : /* break; */
239 : }
240 :
241 0 : if (s->debug) {
242 0 : (void)BIO_flush(s->wbio);
243 : }
244 :
245 0 : if ((cb != NULL) && (s->state != state)) {
246 : new_state = s->state;
247 0 : s->state = state;
248 0 : cb(s, SSL_CB_CONNECT_LOOP, 1);
249 0 : s->state = new_state;
250 : }
251 : }
252 : end:
253 0 : s->in_handshake--;
254 0 : if (buf != NULL)
255 0 : BUF_MEM_free(buf);
256 0 : if (cb != NULL)
257 0 : cb(s, SSL_CB_CONNECT_EXIT, ret);
258 0 : return (ret);
259 : }
260 :
261 0 : static int ssl23_no_ssl2_ciphers(SSL *s)
262 : {
263 : SSL_CIPHER *cipher;
264 : STACK_OF(SSL_CIPHER) *ciphers;
265 : int i;
266 0 : ciphers = SSL_get_ciphers(s);
267 0 : for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
268 0 : cipher = sk_SSL_CIPHER_value(ciphers, i);
269 0 : 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 : */
279 746 : int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len)
280 : {
281 : int send_time = 0;
282 746 : if (len < 4)
283 : return 0;
284 746 : if (server)
285 373 : send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0;
286 : else
287 373 : send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0;
288 746 : if (send_time) {
289 0 : unsigned long Time = (unsigned long)time(NULL);
290 : unsigned char *p = result;
291 0 : l2n(Time, p);
292 0 : return RAND_pseudo_bytes(p, len - 4);
293 : } else
294 746 : return RAND_pseudo_bytes(result, len);
295 : }
296 :
297 0 : 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 0 : int al = 0;
306 : #ifndef OPENSSL_NO_COMP
307 : int j;
308 : SSL_COMP *comp;
309 : #endif
310 : int ret;
311 0 : unsigned long mask, options = s->options;
312 :
313 0 : ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1;
314 :
315 0 : 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 0 : 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 0 : 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 0 : mask &= ~SSL_OP_NO_TLSv1_1;
343 0 : if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
344 : version = TLS1_VERSION;
345 0 : mask &= ~SSL_OP_NO_TLSv1;
346 : #if !defined(OPENSSL_NO_SSL3)
347 0 : if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
348 : version = SSL3_VERSION;
349 0 : mask &= ~SSL_OP_NO_SSLv3;
350 : #endif
351 : #if !defined(OPENSSL_NO_SSL2)
352 0 : if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask)
353 : version = SSL2_VERSION;
354 : #endif
355 :
356 : #ifndef OPENSSL_NO_TLSEXT
357 0 : if (version != SSL2_VERSION) {
358 : /*
359 : * have to disable SSL 2.0 compatibility if we need TLS extensions
360 : */
361 :
362 0 : if (s->tlsext_hostname != NULL)
363 : ssl2_compat = 0;
364 0 : 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 0 : if (s->cert->cli_ext.meths_count != 0)
372 : ssl2_compat = 0;
373 : }
374 : #endif
375 :
376 0 : buf = (unsigned char *)s->init_buf->data;
377 0 : if (s->state == SSL23_ST_CW_CLNT_HELLO_A) {
378 : #if 0
379 : /* don't reuse session-id's */
380 : if (!ssl_get_new_session(s, 0)) {
381 : return (-1);
382 : }
383 : #endif
384 :
385 0 : p = s->s3->client_random;
386 0 : if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
387 : return -1;
388 :
389 0 : if (version == TLS1_2_VERSION) {
390 : version_major = TLS1_2_VERSION_MAJOR;
391 : version_minor = TLS1_2_VERSION_MINOR;
392 0 : } else if (tls1_suiteb(s)) {
393 0 : SSLerr(SSL_F_SSL23_CLIENT_HELLO,
394 : SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
395 0 : return -1;
396 0 : } else if (version == TLS1_1_VERSION) {
397 : version_major = TLS1_1_VERSION_MAJOR;
398 : version_minor = TLS1_1_VERSION_MINOR;
399 0 : } else if (version == TLS1_VERSION) {
400 : version_major = TLS1_VERSION_MAJOR;
401 : version_minor = TLS1_VERSION_MINOR;
402 : }
403 : #ifdef OPENSSL_FIPS
404 : else if (FIPS_mode()) {
405 : SSLerr(SSL_F_SSL23_CLIENT_HELLO,
406 : SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
407 : return -1;
408 : }
409 : #endif
410 0 : else if (version == SSL3_VERSION) {
411 : version_major = SSL3_VERSION_MAJOR;
412 : version_minor = SSL3_VERSION_MINOR;
413 0 : } else if (version == SSL2_VERSION) {
414 : version_major = SSL2_VERSION_MAJOR;
415 : version_minor = SSL2_VERSION_MINOR;
416 : } else {
417 0 : SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_PROTOCOLS_AVAILABLE);
418 0 : return (-1);
419 : }
420 :
421 0 : s->client_version = version;
422 :
423 0 : if (ssl2_compat) {
424 : /* create SSL 2.0 compatible Client Hello */
425 :
426 : /* two byte record header will be written last */
427 0 : d = &(buf[2]);
428 0 : p = d + 9; /* leave space for message type, version,
429 : * individual length fields */
430 :
431 0 : *(d++) = SSL2_MT_CLIENT_HELLO;
432 0 : *(d++) = version_major;
433 0 : *(d++) = version_minor;
434 :
435 : /* Ciphers supported */
436 0 : i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), p, 0);
437 0 : if (i == 0) {
438 : /* no ciphers */
439 0 : SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
440 0 : return -1;
441 : }
442 0 : s2n(i, d);
443 0 : p += i;
444 :
445 : /*
446 : * put in the session-id length (zero since there is no reuse)
447 : */
448 : #if 0
449 : s->session->session_id_length = 0;
450 : #endif
451 0 : s2n(0, d);
452 :
453 0 : if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
454 : ch_len = SSL2_CHALLENGE_LENGTH;
455 : else
456 : ch_len = SSL2_MAX_CHALLENGE_LENGTH;
457 :
458 : /* write out sslv2 challenge */
459 : /*
460 : * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it
461 : * is one of SSL2_MAX_CHALLENGE_LENGTH (32) or
462 : * SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for
463 : * futurproofing
464 : */
465 0 : if (SSL3_RANDOM_SIZE < ch_len)
466 : i = SSL3_RANDOM_SIZE;
467 : else
468 : i = ch_len;
469 0 : s2n(i, d);
470 0 : memset(&(s->s3->client_random[0]), 0, SSL3_RANDOM_SIZE);
471 0 : if (RAND_pseudo_bytes
472 0 : (&(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i) <= 0)
473 : return -1;
474 :
475 0 : memcpy(p, &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i);
476 0 : p += i;
477 :
478 0 : i = p - &(buf[2]);
479 0 : buf[0] = ((i >> 8) & 0xff) | 0x80;
480 0 : buf[1] = (i & 0xff);
481 :
482 : /* number of bytes to write */
483 0 : s->init_num = i + 2;
484 0 : s->init_off = 0;
485 :
486 0 : ssl3_finish_mac(s, &(buf[2]), i);
487 : } else {
488 : /* create Client Hello in SSL 3.0/TLS 1.0 format */
489 :
490 : /*
491 : * do the record header (5 bytes) and handshake message header (4
492 : * bytes) last
493 : */
494 0 : d = p = &(buf[9]);
495 :
496 0 : *(p++) = version_major;
497 0 : *(p++) = version_minor;
498 :
499 : /* Random stuff */
500 0 : memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
501 : p += SSL3_RANDOM_SIZE;
502 :
503 : /* Session ID (zero since there is no reuse) */
504 0 : *(p++) = 0;
505 :
506 : /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
507 0 : i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]),
508 : ssl3_put_cipher_by_char);
509 0 : if (i == 0) {
510 0 : SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
511 0 : return -1;
512 : }
513 : #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
514 : /*
515 : * Some servers hang if client hello > 256 bytes as hack
516 : * workaround chop number of supported ciphers to keep it well
517 : * below this if we use TLS v1.2
518 : */
519 : if (TLS1_get_version(s) >= TLS1_2_VERSION
520 : && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
521 : i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
522 : #endif
523 0 : s2n(i, p);
524 0 : p += i;
525 :
526 : /* COMPRESSION */
527 : #ifdef OPENSSL_NO_COMP
528 : *(p++) = 1;
529 : #else
530 0 : if ((s->options & SSL_OP_NO_COMPRESSION)
531 0 : || !s->ctx->comp_methods)
532 : j = 0;
533 : else
534 0 : j = sk_SSL_COMP_num(s->ctx->comp_methods);
535 0 : *(p++) = 1 + j;
536 0 : for (i = 0; i < j; i++) {
537 0 : comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
538 0 : *(p++) = comp->id;
539 : }
540 : #endif
541 0 : *(p++) = 0; /* Add the NULL method */
542 :
543 : #ifndef OPENSSL_NO_TLSEXT
544 : /* TLS extensions */
545 0 : if (ssl_prepare_clienthello_tlsext(s) <= 0) {
546 0 : SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
547 0 : return -1;
548 : }
549 0 : if ((p =
550 0 : ssl_add_clienthello_tlsext(s, p,
551 : buf + SSL3_RT_MAX_PLAIN_LENGTH,
552 : &al)) == NULL) {
553 0 : ssl3_send_alert(s, SSL3_AL_FATAL, al);
554 0 : SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
555 0 : return -1;
556 : }
557 : #endif
558 :
559 0 : l = p - d;
560 :
561 : /* fill in 4-byte handshake header */
562 : d = &(buf[5]);
563 0 : *(d++) = SSL3_MT_CLIENT_HELLO;
564 0 : l2n3(l, d);
565 :
566 0 : l += 4;
567 :
568 0 : if (l > SSL3_RT_MAX_PLAIN_LENGTH) {
569 0 : SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
570 0 : return -1;
571 : }
572 :
573 : /* fill in 5-byte record header */
574 : d = buf;
575 0 : *(d++) = SSL3_RT_HANDSHAKE;
576 0 : *(d++) = version_major;
577 : /*
578 : * Some servers hang if we use long client hellos and a record
579 : * number > TLS 1.0.
580 : */
581 0 : if (TLS1_get_client_version(s) > TLS1_VERSION)
582 0 : *(d++) = 1;
583 : else
584 0 : *(d++) = version_minor;
585 0 : s2n((int)l, d);
586 :
587 : /* number of bytes to write */
588 0 : s->init_num = p - buf;
589 0 : s->init_off = 0;
590 :
591 0 : ssl3_finish_mac(s, &(buf[5]), s->init_num - 5);
592 : }
593 :
594 0 : s->state = SSL23_ST_CW_CLNT_HELLO_B;
595 0 : s->init_off = 0;
596 : }
597 :
598 : /* SSL3_ST_CW_CLNT_HELLO_B */
599 0 : ret = ssl23_write_bytes(s);
600 :
601 0 : if ((ret >= 2) && s->msg_callback) {
602 : /* Client Hello has been sent; tell msg_callback */
603 :
604 0 : if (ssl2_compat)
605 0 : s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data + 2,
606 0 : ret - 2, s, s->msg_callback_arg);
607 : else {
608 0 : s->msg_callback(1, version, SSL3_RT_HEADER, s->init_buf->data, 5,
609 : s, s->msg_callback_arg);
610 0 : s->msg_callback(1, version, SSL3_RT_HANDSHAKE,
611 0 : s->init_buf->data + 5, ret - 5, s,
612 : s->msg_callback_arg);
613 : }
614 : }
615 :
616 0 : return ret;
617 : }
618 :
619 0 : static int ssl23_get_server_hello(SSL *s)
620 : {
621 : char buf[8];
622 : unsigned char *p;
623 : int i;
624 : int n;
625 :
626 0 : n = ssl23_read_bytes(s, 7);
627 :
628 0 : if (n != 7)
629 : return (n);
630 0 : p = s->packet;
631 :
632 0 : memcpy(buf, p, n);
633 :
634 0 : if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
635 0 : (p[5] == 0x00) && (p[6] == 0x02)) {
636 : #ifdef OPENSSL_NO_SSL2
637 : SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
638 : goto err;
639 : #else
640 : /* we are talking sslv2 */
641 : /*
642 : * we need to clean up the SSLv3 setup and put in the sslv2 stuff.
643 : */
644 : int ch_len;
645 :
646 0 : if (s->options & SSL_OP_NO_SSLv2) {
647 0 : SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
648 0 : goto err;
649 : }
650 0 : if (s->s2 == NULL) {
651 0 : if (!ssl2_new(s))
652 : goto err;
653 : } else
654 0 : ssl2_clear(s);
655 :
656 0 : if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
657 : ch_len = SSL2_CHALLENGE_LENGTH;
658 : else
659 : ch_len = SSL2_MAX_CHALLENGE_LENGTH;
660 :
661 : /* write out sslv2 challenge */
662 : /*
663 : * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it is
664 : * one of SSL2_MAX_CHALLENGE_LENGTH (32) or SSL2_MAX_CHALLENGE_LENGTH
665 : * (16), but leave the check in for futurproofing
666 : */
667 0 : i = (SSL3_RANDOM_SIZE < ch_len)
668 : ? SSL3_RANDOM_SIZE : ch_len;
669 0 : s->s2->challenge_length = i;
670 0 : memcpy(s->s2->challenge,
671 0 : &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i);
672 :
673 0 : if (s->s3 != NULL)
674 0 : ssl3_free(s);
675 :
676 0 : if (!BUF_MEM_grow_clean(s->init_buf,
677 : SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) {
678 0 : SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, ERR_R_BUF_LIB);
679 0 : goto err;
680 : }
681 :
682 0 : s->state = SSL2_ST_GET_SERVER_HELLO_A;
683 0 : if (!(s->client_version == SSL2_VERSION))
684 : /*
685 : * use special padding (SSL 3.0 draft/RFC 2246, App. E.2)
686 : */
687 0 : s->s2->ssl2_rollback = 1;
688 :
689 : /*
690 : * setup the 7 bytes we have read so we get them from the sslv2
691 : * buffer
692 : */
693 0 : s->rstate = SSL_ST_READ_HEADER;
694 0 : s->packet_length = n;
695 0 : s->packet = &(s->s2->rbuf[0]);
696 : memcpy(s->packet, buf, n);
697 0 : s->s2->rbuf_left = n;
698 0 : s->s2->rbuf_offs = 0;
699 :
700 : /* we have already written one */
701 0 : s->s2->write_sequence = 1;
702 :
703 0 : s->method = SSLv2_client_method();
704 0 : s->handshake_func = s->method->ssl_connect;
705 : #endif
706 0 : } else if (p[1] == SSL3_VERSION_MAJOR &&
707 0 : p[2] <= TLS1_2_VERSION_MINOR &&
708 0 : ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
709 0 : (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) {
710 : /* we have sslv3 or tls1 (server hello or alert) */
711 :
712 : #ifndef OPENSSL_NO_SSL3
713 0 : if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) {
714 : # ifdef OPENSSL_FIPS
715 : if (FIPS_mode()) {
716 : SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
717 : SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
718 : goto err;
719 : }
720 : # endif
721 0 : s->version = SSL3_VERSION;
722 0 : s->method = SSLv3_client_method();
723 : } else
724 : #endif
725 0 : if ((p[2] == TLS1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1)) {
726 0 : s->version = TLS1_VERSION;
727 0 : s->method = TLSv1_client_method();
728 0 : } else if ((p[2] == TLS1_1_VERSION_MINOR) &&
729 0 : !(s->options & SSL_OP_NO_TLSv1_1)) {
730 0 : s->version = TLS1_1_VERSION;
731 0 : s->method = TLSv1_1_client_method();
732 0 : } else if ((p[2] == TLS1_2_VERSION_MINOR) &&
733 0 : !(s->options & SSL_OP_NO_TLSv1_2)) {
734 0 : s->version = TLS1_2_VERSION;
735 0 : s->method = TLSv1_2_client_method();
736 : } else {
737 0 : SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
738 0 : goto err;
739 : }
740 :
741 : /* ensure that TLS_MAX_VERSION is up-to-date */
742 0 : OPENSSL_assert(s->version <= TLS_MAX_VERSION);
743 :
744 0 : 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 0 : if (s->info_callback != NULL)
751 : cb = s->info_callback;
752 0 : else if (s->ctx->info_callback != NULL)
753 : cb = s->ctx->info_callback;
754 :
755 0 : i = p[5];
756 0 : if (cb != NULL) {
757 0 : j = (i << 8) | p[6];
758 0 : cb(s, SSL_CB_READ_ALERT, j);
759 : }
760 :
761 0 : if (s->msg_callback) {
762 0 : s->msg_callback(0, s->version, SSL3_RT_HEADER, p, 5, s,
763 : s->msg_callback_arg);
764 0 : s->msg_callback(0, s->version, SSL3_RT_ALERT, p + 5, 2, s,
765 : s->msg_callback_arg);
766 : }
767 :
768 0 : s->rwstate = SSL_NOTHING;
769 0 : SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_AD_REASON_OFFSET + p[6]);
770 0 : goto err;
771 : }
772 :
773 0 : if (!ssl_init_wbio_buffer(s, 1))
774 : goto err;
775 :
776 : /* we are in this state */
777 0 : 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 0 : s->rstate = SSL_ST_READ_HEADER;
783 0 : s->packet_length = n;
784 0 : if (s->s3->rbuf.buf == NULL)
785 0 : if (!ssl3_setup_read_buffer(s))
786 : goto err;
787 0 : s->packet = &(s->s3->rbuf.buf[0]);
788 : memcpy(s->packet, buf, n);
789 0 : s->s3->rbuf.left = n;
790 0 : s->s3->rbuf.offset = 0;
791 :
792 0 : s->handshake_func = s->method->ssl_connect;
793 : } else {
794 0 : SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNKNOWN_PROTOCOL);
795 0 : goto err;
796 : }
797 0 : s->init_num = 0;
798 :
799 : /*
800 : * Since, if we are sending a ssl23 client hello, we are not reusing a
801 : * session-id
802 : */
803 0 : if (!ssl_get_new_session(s, 0))
804 : goto err;
805 :
806 0 : return (SSL_connect(s));
807 : err:
808 : return (-1);
809 : }
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