2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
61 #include <openssl/buffer.h>
62 #include <openssl/rand.h>
63 #include <openssl/objects.h>
64 #include <openssl/evp.h>
66 static SSL_METHOD *ssl23_get_client_method(int ver);
67 static int ssl23_client_hello(SSL *s);
68 static int ssl23_get_server_hello(SSL *s);
69 static SSL_METHOD *ssl23_get_client_method(int ver)
71 #ifndef OPENSSL_NO_SSL2
72 if (ver == SSL2_VERSION)
73 return (SSLv2_client_method());
75 #ifndef OPENSSL_NO_SSL3
76 if (ver == SSL3_VERSION)
77 return (SSLv3_client_method());
79 if (ver == TLS1_VERSION)
80 return (TLSv1_client_method());
85 IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
86 ssl_undefined_function,
87 ssl23_connect, ssl23_get_client_method)
89 int ssl23_connect(SSL *s)
92 unsigned long Time = (unsigned long)time(NULL);
93 void (*cb) (const SSL *ssl, int type, int val) = NULL;
97 RAND_add(&Time, sizeof(Time), 0);
101 if (s->info_callback != NULL)
102 cb = s->info_callback;
103 else if (s->ctx->info_callback != NULL)
104 cb = s->ctx->info_callback;
107 if (!SSL_in_init(s) || SSL_in_before(s))
116 case SSL_ST_BEFORE | SSL_ST_CONNECT:
117 case SSL_ST_OK | SSL_ST_CONNECT:
119 if (s->session != NULL) {
120 SSLerr(SSL_F_SSL23_CONNECT,
121 SSL_R_SSL23_DOING_SESSION_ID_REUSE);
127 cb(s, SSL_CB_HANDSHAKE_START, 1);
129 /* s->version=TLS1_VERSION; */
130 s->type = SSL_ST_CONNECT;
132 if (s->init_buf == NULL) {
133 if ((buf = BUF_MEM_new()) == NULL) {
137 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
145 if (!ssl3_setup_buffers(s)) {
150 ssl3_init_finished_mac(s);
152 s->state = SSL23_ST_CW_CLNT_HELLO_A;
153 s->ctx->stats.sess_connect++;
157 case SSL23_ST_CW_CLNT_HELLO_A:
158 case SSL23_ST_CW_CLNT_HELLO_B:
161 ret = ssl23_client_hello(s);
164 s->state = SSL23_ST_CR_SRVR_HELLO_A;
169 case SSL23_ST_CR_SRVR_HELLO_A:
170 case SSL23_ST_CR_SRVR_HELLO_B:
171 ret = ssl23_get_server_hello(s);
178 SSLerr(SSL_F_SSL23_CONNECT, SSL_R_UNKNOWN_STATE);
185 (void)BIO_flush(s->wbio);
188 if ((cb != NULL) && (s->state != state)) {
189 new_state = s->state;
191 cb(s, SSL_CB_CONNECT_LOOP, 1);
192 s->state = new_state;
200 cb(s, SSL_CB_CONNECT_EXIT, ret);
204 static int ssl23_client_hello(SSL *s)
207 unsigned char *p, *d;
209 unsigned long Time, l;
211 int version = 0, version_major, version_minor;
212 #ifndef OPENSSL_NO_COMP
218 ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
220 if (!(s->options & SSL_OP_NO_TLSv1)) {
221 version = TLS1_VERSION;
222 } else if (!(s->options & SSL_OP_NO_SSLv3)) {
223 version = SSL3_VERSION;
224 } else if (!(s->options & SSL_OP_NO_SSLv2)) {
225 version = SSL2_VERSION;
227 #ifndef OPENSSL_NO_TLSEXT
228 if (version != SSL2_VERSION) {
230 * have to disable SSL 2.0 compatibility if we need TLS extensions
233 if (s->tlsext_hostname != NULL)
235 if (s->tlsext_status_type != -1)
240 buf = (unsigned char *)s->init_buf->data;
241 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) {
243 /* don't reuse session-id's */
244 if (!ssl_get_new_session(s, 0)) {
249 p = s->s3->client_random;
250 Time = (unsigned long)time(NULL); /* Time */
252 if (RAND_pseudo_bytes(p, SSL3_RANDOM_SIZE - 4) <= 0)
255 if (version == TLS1_VERSION) {
256 version_major = TLS1_VERSION_MAJOR;
257 version_minor = TLS1_VERSION_MINOR;
260 else if (FIPS_mode()) {
261 SSLerr(SSL_F_SSL23_CLIENT_HELLO,
262 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
266 else if (version == SSL3_VERSION) {
267 version_major = SSL3_VERSION_MAJOR;
268 version_minor = SSL3_VERSION_MINOR;
269 } else if (version == SSL2_VERSION) {
270 version_major = SSL2_VERSION_MAJOR;
271 version_minor = SSL2_VERSION_MINOR;
273 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_PROTOCOLS_AVAILABLE);
277 s->client_version = version;
280 /* create SSL 2.0 compatible Client Hello */
282 /* two byte record header will be written last */
284 p = d + 9; /* leave space for message type, version,
285 * individual length fields */
287 *(d++) = SSL2_MT_CLIENT_HELLO;
288 *(d++) = version_major;
289 *(d++) = version_minor;
291 /* Ciphers supported */
292 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), p, 0);
295 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
302 * put in the session-id length (zero since there is no reuse)
305 s->session->session_id_length = 0;
309 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
310 ch_len = SSL2_CHALLENGE_LENGTH;
312 ch_len = SSL2_MAX_CHALLENGE_LENGTH;
314 /* write out sslv2 challenge */
315 if (SSL3_RANDOM_SIZE < ch_len)
316 i = SSL3_RANDOM_SIZE;
320 memset(&(s->s3->client_random[0]), 0, SSL3_RANDOM_SIZE);
321 if (RAND_pseudo_bytes
322 (&(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i) <= 0)
325 memcpy(p, &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i);
329 buf[0] = ((i >> 8) & 0xff) | 0x80;
332 /* number of bytes to write */
336 ssl3_finish_mac(s, &(buf[2]), i);
338 /* create Client Hello in SSL 3.0/TLS 1.0 format */
341 * do the record header (5 bytes) and handshake message header (4
346 *(p++) = version_major;
347 *(p++) = version_minor;
350 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
351 p += SSL3_RANDOM_SIZE;
353 /* Session ID (zero since there is no reuse) */
356 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
357 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]),
358 ssl3_put_cipher_by_char);
360 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
365 #ifdef OPENSSL_NO_COMP
369 if (s->ctx->comp_methods == NULL)
372 j = sk_SSL_COMP_num(s->ctx->comp_methods);
374 for (i = 0; i < j; i++) {
375 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
379 *(p++) = 0; /* Add the NULL method */
380 #ifndef OPENSSL_NO_TLSEXT
382 ssl_add_clienthello_tlsext(s, p,
384 SSL3_RT_MAX_PLAIN_LENGTH)) ==
386 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
394 /* fill in 4-byte handshake header */
396 *(d++) = SSL3_MT_CLIENT_HELLO;
401 if (l > SSL3_RT_MAX_PLAIN_LENGTH) {
402 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
406 /* fill in 5-byte record header */
408 *(d++) = SSL3_RT_HANDSHAKE;
409 *(d++) = version_major;
410 *(d++) = version_minor; /* arguably we should send the *lowest*
411 * suported version here (indicating,
412 * e.g., TLS 1.0 in "SSL 3.0 format") */
415 /* number of bytes to write */
416 s->init_num = p - buf;
419 ssl3_finish_mac(s, &(buf[5]), s->init_num - 5);
422 s->state = SSL23_ST_CW_CLNT_HELLO_B;
426 /* SSL3_ST_CW_CLNT_HELLO_B */
427 ret = ssl23_write_bytes(s);
429 if ((ret >= 2) && s->msg_callback) {
430 /* Client Hello has been sent; tell msg_callback */
433 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data + 2,
434 ret - 2, s, s->msg_callback_arg);
436 s->msg_callback(1, version, SSL3_RT_HANDSHAKE,
437 s->init_buf->data + 5, ret - 5, s,
438 s->msg_callback_arg);
444 static int ssl23_get_server_hello(SSL *s)
451 n = ssl23_read_bytes(s, 7);
459 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
460 (p[5] == 0x00) && (p[6] == 0x02)) {
461 #ifdef OPENSSL_NO_SSL2
462 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
465 /* we are talking sslv2 */
467 * we need to clean up the SSLv3 setup and put in the sslv2 stuff.
471 if (s->options & SSL_OP_NO_SSLv2) {
472 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
481 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
482 ch_len = SSL2_CHALLENGE_LENGTH;
484 ch_len = SSL2_MAX_CHALLENGE_LENGTH;
486 /* write out sslv2 challenge */
487 i = (SSL3_RANDOM_SIZE < ch_len)
488 ? SSL3_RANDOM_SIZE : ch_len;
489 s->s2->challenge_length = i;
490 memcpy(s->s2->challenge,
491 &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i);
496 if (!BUF_MEM_grow_clean(s->init_buf,
497 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) {
498 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, ERR_R_BUF_LIB);
502 s->state = SSL2_ST_GET_SERVER_HELLO_A;
503 if (!(s->client_version == SSL2_VERSION))
505 * use special padding (SSL 3.0 draft/RFC 2246, App. E.2)
507 s->s2->ssl2_rollback = 1;
510 * setup the 7 bytes we have read so we get them from the sslv2
513 s->rstate = SSL_ST_READ_HEADER;
514 s->packet_length = n;
515 s->packet = &(s->s2->rbuf[0]);
516 memcpy(s->packet, buf, n);
517 s->s2->rbuf_left = n;
518 s->s2->rbuf_offs = 0;
520 /* we have already written one */
521 s->s2->write_sequence = 1;
523 s->method = SSLv2_client_method();
524 s->handshake_func = s->method->ssl_connect;
526 } else if (p[1] == SSL3_VERSION_MAJOR &&
527 ((p[2] == SSL3_VERSION_MINOR) ||
528 (p[2] == TLS1_VERSION_MINOR)) &&
529 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
530 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) {
531 /* we have sslv3 or tls1 (server hello or alert) */
533 #ifndef OPENSSL_NO_SSL3
534 if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) {
537 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
538 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
542 s->version = SSL3_VERSION;
543 s->method = SSLv3_client_method();
546 if ((p[2] == TLS1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1)) {
547 s->version = TLS1_VERSION;
548 s->method = TLSv1_client_method();
550 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
554 /* ensure that TLS_MAX_VERSION is up-to-date */
555 OPENSSL_assert(s->version <= TLS_MAX_VERSION);
557 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) {
560 void (*cb) (const SSL *ssl, int type, int val) = NULL;
563 if (s->info_callback != NULL)
564 cb = s->info_callback;
565 else if (s->ctx->info_callback != NULL)
566 cb = s->ctx->info_callback;
571 cb(s, SSL_CB_READ_ALERT, j);
575 s->msg_callback(0, s->version, SSL3_RT_ALERT, p + 5, 2, s,
576 s->msg_callback_arg);
578 s->rwstate = SSL_NOTHING;
579 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_AD_REASON_OFFSET + p[6]);
583 if (!ssl_init_wbio_buffer(s, 1))
586 /* we are in this state */
587 s->state = SSL3_ST_CR_SRVR_HELLO_A;
590 * put the 7 bytes we have read into the input buffer for SSLv3
592 s->rstate = SSL_ST_READ_HEADER;
593 s->packet_length = n;
594 if (s->s3->rbuf.buf == NULL)
595 if (!ssl3_setup_buffers(s))
597 s->packet = &(s->s3->rbuf.buf[0]);
598 memcpy(s->packet, buf, n);
599 s->s3->rbuf.left = n;
600 s->s3->rbuf.offset = 0;
602 s->handshake_func = s->method->ssl_connect;
604 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNKNOWN_PROTOCOL);
610 * Since, if we are sending a ssl23 client hello, we are not reusing a
613 if (!ssl_get_new_session(s, 0))
616 return (SSL_connect(s));