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d02b48c6 | 1 | /* ssl/s23_clnt.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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. | |
10621efd | 8 | * |
d02b48c6 RE |
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). | |
10621efd | 15 | * |
d02b48c6 RE |
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. | |
10621efd | 22 | * |
d02b48c6 RE |
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 :-). | |
10621efd | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
10621efd | 40 | * |
d02b48c6 RE |
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. | |
10621efd | 52 | * |
d02b48c6 RE |
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 | */ | |
f1fd4544 BM |
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 | |
10621efd | 66 | * notice, this list of conditions and the following disclaimer. |
f1fd4544 BM |
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 | */ | |
d02b48c6 RE |
111 | |
112 | #include <stdio.h> | |
7b63c0fa | 113 | #include "ssl_locl.h" |
ec577822 BM |
114 | #include <openssl/buffer.h> |
115 | #include <openssl/rand.h> | |
116 | #include <openssl/objects.h> | |
117 | #include <openssl/evp.h> | |
d02b48c6 | 118 | |
4ebb342f | 119 | static const SSL_METHOD *ssl23_get_client_method(int ver); |
d02b48c6 RE |
120 | static int ssl23_client_hello(SSL *s); |
121 | static int ssl23_get_server_hello(SSL *s); | |
4ebb342f | 122 | static const SSL_METHOD *ssl23_get_client_method(int ver) |
10621efd | 123 | { |
bc36ee62 | 124 | #ifndef OPENSSL_NO_SSL2 |
10621efd MC |
125 | if (ver == SSL2_VERSION) |
126 | return (SSLv2_client_method()); | |
aa82db4f | 127 | #endif |
26a59d9b | 128 | #ifndef OPENSSL_NO_SSL3 |
10621efd MC |
129 | if (ver == SSL3_VERSION) |
130 | return (SSLv3_client_method()); | |
26a59d9b | 131 | #endif |
10621efd MC |
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 | } | |
d02b48c6 | 141 | |
f3b656b2 | 142 | IMPLEMENT_ssl23_meth_func(SSLv23_client_method, |
10621efd MC |
143 | ssl_undefined_function, |
144 | ssl23_connect, ssl23_get_client_method) | |
d02b48c6 | 145 | |
6b691a5c | 146 | int ssl23_connect(SSL *s) |
10621efd MC |
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 | } | |
d02b48c6 | 260 | |
9ae57435 | 261 | static int ssl23_no_ssl2_ciphers(SSL *s) |
10621efd MC |
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 | */ | |
3da721da | 279 | int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len) |
10621efd MC |
280 | { |
281 | int send_time = 0; | |
282 | ||
283 | if (len < 4) | |
284 | return 0; | |
285 | if (server) | |
286 | send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0; | |
287 | else | |
288 | send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0; | |
289 | if (send_time) { | |
290 | unsigned long Time = (unsigned long)time(NULL); | |
291 | unsigned char *p = result; | |
292 | l2n(Time, p); | |
293 | return RAND_pseudo_bytes(p, len - 4); | |
294 | } else | |
295 | return RAND_pseudo_bytes(result, len); | |
296 | } | |
3da721da | 297 | |
6b691a5c | 298 | static int ssl23_client_hello(SSL *s) |
10621efd MC |
299 | { |
300 | unsigned char *buf; | |
301 | unsigned char *p, *d; | |
302 | int i, ch_len; | |
303 | unsigned long l; | |
304 | int ssl2_compat; | |
305 | int version = 0, version_major, version_minor; | |
f45e8c7b | 306 | #ifndef OPENSSL_NO_COMP |
10621efd MC |
307 | int j; |
308 | SSL_COMP *comp; | |
f45e8c7b | 309 | #endif |
10621efd MC |
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 | |
5bbed295 | 327 | #if !defined(OPENSSL_NO_SSL3) |
10621efd | 328 | | SSL_OP_NO_SSLv3 |
418044cb | 329 | #endif |
5bbed295 | 330 | #if !defined(OPENSSL_NO_SSL2) |
10621efd | 331 | | (ssl2_compat ? SSL_OP_NO_SSLv2 : 0) |
5bbed295 | 332 | #endif |
10621efd | 333 | ; |
5bbed295 | 334 | #if !defined(OPENSSL_NO_TLS1_2_CLIENT) |
10621efd | 335 | version = TLS1_2_VERSION; |
5bbed295 | 336 | |
10621efd MC |
337 | if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask) |
338 | version = TLS1_1_VERSION; | |
5bbed295 | 339 | #else |
10621efd | 340 | version = TLS1_1_VERSION; |
5bbed295 | 341 | #endif |
10621efd MC |
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; | |
5bbed295 | 346 | #if !defined(OPENSSL_NO_SSL3) |
10621efd MC |
347 | if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask) |
348 | version = SSL3_VERSION; | |
349 | mask &= ~SSL_OP_NO_SSLv3; | |
5bbed295 AP |
350 | #endif |
351 | #if !defined(OPENSSL_NO_SSL2) | |
10621efd MC |
352 | if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask) |
353 | version = SSL2_VERSION; | |
5bbed295 AP |
354 | #endif |
355 | ||
0702150f | 356 | #ifndef OPENSSL_NO_TLSEXT |
10621efd MC |
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 | } | |
0702150f | 372 | #endif |
761772d7 | 373 | |
10621efd MC |
374 | buf = (unsigned char *)s->init_buf->data; |
375 | if (s->state == SSL23_ST_CW_CLNT_HELLO_A) { | |
d02b48c6 | 376 | #if 0 |
10621efd MC |
377 | /* don't reuse session-id's */ |
378 | if (!ssl_get_new_session(s, 0)) { | |
379 | return (-1); | |
380 | } | |
d02b48c6 RE |
381 | #endif |
382 | ||
10621efd MC |
383 | p = s->s3->client_random; |
384 | if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0) | |
385 | return -1; | |
386 | ||
387 | if (version == TLS1_2_VERSION) { | |
388 | version_major = TLS1_2_VERSION_MAJOR; | |
389 | version_minor = TLS1_2_VERSION_MINOR; | |
390 | } else if (version == TLS1_1_VERSION) { | |
391 | version_major = TLS1_1_VERSION_MAJOR; | |
392 | version_minor = TLS1_1_VERSION_MINOR; | |
393 | } else if (version == TLS1_VERSION) { | |
394 | version_major = TLS1_VERSION_MAJOR; | |
395 | version_minor = TLS1_VERSION_MINOR; | |
396 | } | |
7043fa70 | 397 | #ifdef OPENSSL_FIPS |
10621efd MC |
398 | else if (FIPS_mode()) { |
399 | SSLerr(SSL_F_SSL23_CLIENT_HELLO, | |
400 | SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); | |
401 | return -1; | |
402 | } | |
7043fa70 | 403 | #endif |
10621efd MC |
404 | else if (version == SSL3_VERSION) { |
405 | version_major = SSL3_VERSION_MAJOR; | |
406 | version_minor = SSL3_VERSION_MINOR; | |
407 | } else if (version == SSL2_VERSION) { | |
408 | version_major = SSL2_VERSION_MAJOR; | |
409 | version_minor = SSL2_VERSION_MINOR; | |
410 | } else { | |
411 | SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_PROTOCOLS_AVAILABLE); | |
412 | return (-1); | |
413 | } | |
414 | ||
415 | s->client_version = version; | |
416 | ||
417 | if (ssl2_compat) { | |
418 | /* create SSL 2.0 compatible Client Hello */ | |
419 | ||
420 | /* two byte record header will be written last */ | |
421 | d = &(buf[2]); | |
422 | p = d + 9; /* leave space for message type, version, | |
423 | * individual length fields */ | |
424 | ||
425 | *(d++) = SSL2_MT_CLIENT_HELLO; | |
426 | *(d++) = version_major; | |
427 | *(d++) = version_minor; | |
428 | ||
429 | /* Ciphers supported */ | |
430 | i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), p, 0); | |
431 | if (i == 0) { | |
432 | /* no ciphers */ | |
433 | SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); | |
434 | return -1; | |
435 | } | |
436 | s2n(i, d); | |
437 | p += i; | |
438 | ||
439 | /* | |
440 | * put in the session-id length (zero since there is no reuse) | |
441 | */ | |
d02b48c6 | 442 | #if 0 |
10621efd | 443 | s->session->session_id_length = 0; |
d02b48c6 | 444 | #endif |
10621efd MC |
445 | s2n(0, d); |
446 | ||
447 | if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) | |
448 | ch_len = SSL2_CHALLENGE_LENGTH; | |
449 | else | |
450 | ch_len = SSL2_MAX_CHALLENGE_LENGTH; | |
451 | ||
452 | /* write out sslv2 challenge */ | |
453 | /* | |
454 | * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it | |
455 | * is one of SSL2_MAX_CHALLENGE_LENGTH (32) or | |
456 | * SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for | |
457 | * futurproofing | |
458 | */ | |
459 | if (SSL3_RANDOM_SIZE < ch_len) | |
460 | i = SSL3_RANDOM_SIZE; | |
461 | else | |
462 | i = ch_len; | |
463 | s2n(i, d); | |
464 | memset(&(s->s3->client_random[0]), 0, SSL3_RANDOM_SIZE); | |
465 | if (RAND_pseudo_bytes | |
466 | (&(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i) <= 0) | |
467 | return -1; | |
468 | ||
469 | memcpy(p, &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i); | |
470 | p += i; | |
471 | ||
472 | i = p - &(buf[2]); | |
473 | buf[0] = ((i >> 8) & 0xff) | 0x80; | |
474 | buf[1] = (i & 0xff); | |
475 | ||
476 | /* number of bytes to write */ | |
477 | s->init_num = i + 2; | |
478 | s->init_off = 0; | |
479 | ||
480 | ssl3_finish_mac(s, &(buf[2]), i); | |
481 | } else { | |
482 | /* create Client Hello in SSL 3.0/TLS 1.0 format */ | |
483 | ||
484 | /* | |
485 | * do the record header (5 bytes) and handshake message header (4 | |
486 | * bytes) last | |
487 | */ | |
488 | d = p = &(buf[9]); | |
489 | ||
490 | *(p++) = version_major; | |
491 | *(p++) = version_minor; | |
492 | ||
493 | /* Random stuff */ | |
494 | memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); | |
495 | p += SSL3_RANDOM_SIZE; | |
496 | ||
497 | /* Session ID (zero since there is no reuse) */ | |
498 | *(p++) = 0; | |
499 | ||
500 | /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ | |
501 | i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), | |
502 | ssl3_put_cipher_by_char); | |
503 | if (i == 0) { | |
504 | SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); | |
505 | return -1; | |
506 | } | |
89bd25eb | 507 | #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH |
10621efd MC |
508 | /* |
509 | * Some servers hang if client hello > 256 bytes as hack | |
510 | * workaround chop number of supported ciphers to keep it well | |
511 | * below this if we use TLS v1.2 | |
512 | */ | |
513 | if (TLS1_get_version(s) >= TLS1_2_VERSION | |
514 | && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH) | |
515 | i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; | |
89bd25eb | 516 | #endif |
10621efd MC |
517 | s2n(i, p); |
518 | p += i; | |
c6c2e313 | 519 | |
10621efd | 520 | /* COMPRESSION */ |
ed3883d2 | 521 | #ifdef OPENSSL_NO_COMP |
10621efd | 522 | *(p++) = 1; |
ed3883d2 | 523 | #else |
10621efd MC |
524 | if ((s->options & SSL_OP_NO_COMPRESSION) |
525 | || !s->ctx->comp_methods) | |
526 | j = 0; | |
527 | else | |
528 | j = sk_SSL_COMP_num(s->ctx->comp_methods); | |
529 | *(p++) = 1 + j; | |
530 | for (i = 0; i < j; i++) { | |
531 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); | |
532 | *(p++) = comp->id; | |
533 | } | |
ed3883d2 | 534 | #endif |
10621efd | 535 | *(p++) = 0; /* Add the NULL method */ |
f1fd4544 | 536 | |
ed3883d2 | 537 | #ifndef OPENSSL_NO_TLSEXT |
10621efd MC |
538 | /* TLS extensions */ |
539 | if (ssl_prepare_clienthello_tlsext(s) <= 0) { | |
540 | SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); | |
541 | return -1; | |
542 | } | |
543 | if ((p = | |
544 | ssl_add_clienthello_tlsext(s, p, | |
545 | buf + | |
546 | SSL3_RT_MAX_PLAIN_LENGTH)) == | |
547 | NULL) { | |
548 | SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); | |
549 | return -1; | |
550 | } | |
ed3883d2 | 551 | #endif |
10621efd MC |
552 | |
553 | l = p - d; | |
554 | ||
555 | /* fill in 4-byte handshake header */ | |
556 | d = &(buf[5]); | |
557 | *(d++) = SSL3_MT_CLIENT_HELLO; | |
558 | l2n3(l, d); | |
559 | ||
560 | l += 4; | |
561 | ||
562 | if (l > SSL3_RT_MAX_PLAIN_LENGTH) { | |
563 | SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); | |
564 | return -1; | |
565 | } | |
566 | ||
567 | /* fill in 5-byte record header */ | |
568 | d = buf; | |
569 | *(d++) = SSL3_RT_HANDSHAKE; | |
570 | *(d++) = version_major; | |
571 | /* | |
572 | * Some servers hang if we use long client hellos and a record | |
573 | * number > TLS 1.0. | |
574 | */ | |
575 | if (TLS1_get_client_version(s) > TLS1_VERSION) | |
576 | *(d++) = 1; | |
577 | else | |
578 | *(d++) = version_minor; | |
579 | s2n((int)l, d); | |
580 | ||
581 | /* number of bytes to write */ | |
582 | s->init_num = p - buf; | |
583 | s->init_off = 0; | |
584 | ||
585 | ssl3_finish_mac(s, &(buf[5]), s->init_num - 5); | |
586 | } | |
587 | ||
588 | s->state = SSL23_ST_CW_CLNT_HELLO_B; | |
589 | s->init_off = 0; | |
590 | } | |
591 | ||
592 | /* SSL3_ST_CW_CLNT_HELLO_B */ | |
593 | ret = ssl23_write_bytes(s); | |
594 | ||
595 | if ((ret >= 2) && s->msg_callback) { | |
596 | /* Client Hello has been sent; tell msg_callback */ | |
597 | ||
598 | if (ssl2_compat) | |
599 | s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data + 2, | |
600 | ret - 2, s, s->msg_callback_arg); | |
601 | else | |
602 | s->msg_callback(1, version, SSL3_RT_HANDSHAKE, | |
603 | s->init_buf->data + 5, ret - 5, s, | |
604 | s->msg_callback_arg); | |
605 | } | |
606 | ||
607 | return ret; | |
608 | } | |
d02b48c6 | 609 | |
6b691a5c | 610 | static int ssl23_get_server_hello(SSL *s) |
10621efd MC |
611 | { |
612 | char buf[8]; | |
613 | unsigned char *p; | |
614 | int i; | |
615 | int n; | |
d02b48c6 | 616 | |
10621efd | 617 | n = ssl23_read_bytes(s, 7); |
d02b48c6 | 618 | |
10621efd MC |
619 | if (n != 7) |
620 | return (n); | |
621 | p = s->packet; | |
d02b48c6 | 622 | |
10621efd | 623 | memcpy(buf, p, n); |
d02b48c6 | 624 | |
10621efd MC |
625 | if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && |
626 | (p[5] == 0x00) && (p[6] == 0x02)) { | |
bc36ee62 | 627 | #ifdef OPENSSL_NO_SSL2 |
10621efd MC |
628 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); |
629 | goto err; | |
aa82db4f | 630 | #else |
10621efd MC |
631 | /* we are talking sslv2 */ |
632 | /* | |
633 | * we need to clean up the SSLv3 setup and put in the sslv2 stuff. | |
634 | */ | |
635 | int ch_len; | |
636 | ||
637 | if (s->options & SSL_OP_NO_SSLv2) { | |
638 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); | |
639 | goto err; | |
640 | } | |
641 | if (s->s2 == NULL) { | |
642 | if (!ssl2_new(s)) | |
643 | goto err; | |
644 | } else | |
645 | ssl2_clear(s); | |
646 | ||
647 | if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) | |
648 | ch_len = SSL2_CHALLENGE_LENGTH; | |
649 | else | |
650 | ch_len = SSL2_MAX_CHALLENGE_LENGTH; | |
651 | ||
652 | /* write out sslv2 challenge */ | |
653 | /* | |
654 | * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it is | |
655 | * one of SSL2_MAX_CHALLENGE_LENGTH (32) or SSL2_MAX_CHALLENGE_LENGTH | |
656 | * (16), but leave the check in for futurproofing | |
657 | */ | |
658 | i = (SSL3_RANDOM_SIZE < ch_len) | |
659 | ? SSL3_RANDOM_SIZE : ch_len; | |
660 | s->s2->challenge_length = i; | |
661 | memcpy(s->s2->challenge, | |
662 | &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i); | |
663 | ||
664 | if (s->s3 != NULL) | |
665 | ssl3_free(s); | |
666 | ||
667 | if (!BUF_MEM_grow_clean(s->init_buf, | |
668 | SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) { | |
669 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, ERR_R_BUF_LIB); | |
670 | goto err; | |
671 | } | |
672 | ||
673 | s->state = SSL2_ST_GET_SERVER_HELLO_A; | |
674 | if (!(s->client_version == SSL2_VERSION)) | |
675 | /* | |
676 | * use special padding (SSL 3.0 draft/RFC 2246, App. E.2) | |
677 | */ | |
678 | s->s2->ssl2_rollback = 1; | |
679 | ||
680 | /* | |
681 | * setup the 7 bytes we have read so we get them from the sslv2 | |
682 | * buffer | |
683 | */ | |
684 | s->rstate = SSL_ST_READ_HEADER; | |
685 | s->packet_length = n; | |
686 | s->packet = &(s->s2->rbuf[0]); | |
687 | memcpy(s->packet, buf, n); | |
688 | s->s2->rbuf_left = n; | |
689 | s->s2->rbuf_offs = 0; | |
690 | ||
691 | /* we have already written one */ | |
692 | s->s2->write_sequence = 1; | |
693 | ||
694 | s->method = SSLv2_client_method(); | |
695 | s->handshake_func = s->method->ssl_connect; | |
aa82db4f | 696 | #endif |
10621efd MC |
697 | } else if (p[1] == SSL3_VERSION_MAJOR && |
698 | p[2] <= TLS1_2_VERSION_MINOR && | |
699 | ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || | |
700 | (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) { | |
701 | /* we have sslv3 or tls1 (server hello or alert) */ | |
d02b48c6 | 702 | |
26a59d9b | 703 | #ifndef OPENSSL_NO_SSL3 |
10621efd MC |
704 | if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) { |
705 | # ifdef OPENSSL_FIPS | |
706 | if (FIPS_mode()) { | |
707 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, | |
708 | SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); | |
709 | goto err; | |
710 | } | |
711 | # endif | |
712 | s->version = SSL3_VERSION; | |
713 | s->method = SSLv3_client_method(); | |
714 | } else | |
26a59d9b | 715 | #endif |
10621efd MC |
716 | if ((p[2] == TLS1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1)) { |
717 | s->version = TLS1_VERSION; | |
718 | s->method = TLSv1_client_method(); | |
719 | } else if ((p[2] == TLS1_1_VERSION_MINOR) && | |
720 | !(s->options & SSL_OP_NO_TLSv1_1)) { | |
721 | s->version = TLS1_1_VERSION; | |
722 | s->method = TLSv1_1_client_method(); | |
723 | } else if ((p[2] == TLS1_2_VERSION_MINOR) && | |
724 | !(s->options & SSL_OP_NO_TLSv1_2)) { | |
725 | s->version = TLS1_2_VERSION; | |
726 | s->method = TLSv1_2_client_method(); | |
727 | } else { | |
728 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); | |
729 | goto err; | |
730 | } | |
731 | ||
732 | /* ensure that TLS_MAX_VERSION is up-to-date */ | |
733 | OPENSSL_assert(s->version <= TLS_MAX_VERSION); | |
734 | ||
735 | if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) { | |
736 | /* fatal alert */ | |
737 | ||
738 | void (*cb) (const SSL *ssl, int type, int val) = NULL; | |
739 | int j; | |
740 | ||
741 | if (s->info_callback != NULL) | |
742 | cb = s->info_callback; | |
743 | else if (s->ctx->info_callback != NULL) | |
744 | cb = s->ctx->info_callback; | |
745 | ||
746 | i = p[5]; | |
747 | if (cb != NULL) { | |
748 | j = (i << 8) | p[6]; | |
749 | cb(s, SSL_CB_READ_ALERT, j); | |
750 | } | |
751 | ||
752 | if (s->msg_callback) | |
753 | s->msg_callback(0, s->version, SSL3_RT_ALERT, p + 5, 2, s, | |
754 | s->msg_callback_arg); | |
755 | ||
756 | s->rwstate = SSL_NOTHING; | |
757 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_AD_REASON_OFFSET + p[6]); | |
758 | goto err; | |
759 | } | |
760 | ||
761 | if (!ssl_init_wbio_buffer(s, 1)) | |
762 | goto err; | |
763 | ||
764 | /* we are in this state */ | |
765 | s->state = SSL3_ST_CR_SRVR_HELLO_A; | |
766 | ||
767 | /* | |
768 | * put the 7 bytes we have read into the input buffer for SSLv3 | |
769 | */ | |
770 | s->rstate = SSL_ST_READ_HEADER; | |
771 | s->packet_length = n; | |
772 | if (s->s3->rbuf.buf == NULL) | |
773 | if (!ssl3_setup_read_buffer(s)) | |
774 | goto err; | |
775 | s->packet = &(s->s3->rbuf.buf[0]); | |
776 | memcpy(s->packet, buf, n); | |
777 | s->s3->rbuf.left = n; | |
778 | s->s3->rbuf.offset = 0; | |
779 | ||
780 | s->handshake_func = s->method->ssl_connect; | |
781 | } else { | |
782 | SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNKNOWN_PROTOCOL); | |
783 | goto err; | |
784 | } | |
785 | s->init_num = 0; | |
786 | ||
787 | /* | |
788 | * Since, if we are sending a ssl23 client hello, we are not reusing a | |
789 | * session-id | |
790 | */ | |
791 | if (!ssl_get_new_session(s, 0)) | |
792 | goto err; | |
793 | ||
794 | return (SSL_connect(s)); | |
795 | err: | |
796 | return (-1); | |
797 | } |