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.]
58 /* ====================================================================
59 * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
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>
119 static const SSL_METHOD *ssl23_get_server_method(int ver);
120 int ssl23_get_client_hello(SSL *s);
121 static const SSL_METHOD *ssl23_get_server_method(int ver)
123 #ifndef OPENSSL_NO_SSL3
124 if (ver == SSL3_VERSION)
125 return (SSLv3_server_method());
127 if (ver == TLS1_VERSION)
128 return (TLSv1_server_method());
129 else if (ver == TLS1_1_VERSION)
130 return (TLSv1_1_server_method());
131 else if (ver == TLS1_2_VERSION)
132 return (TLSv1_2_server_method());
137 IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
139 ssl_undefined_function, ssl23_get_server_method)
141 int ssl23_accept(SSL *s)
144 unsigned long Time = (unsigned long)time(NULL);
145 void (*cb) (const SSL *ssl, int type, int val) = NULL;
147 int new_state, state;
149 RAND_add(&Time, sizeof(Time), 0);
153 if (s->info_callback != NULL)
154 cb = s->info_callback;
155 else if (s->ctx->info_callback != NULL)
156 cb = s->ctx->info_callback;
159 if (!SSL_in_init(s) || SSL_in_before(s))
168 case SSL_ST_BEFORE | SSL_ST_ACCEPT:
169 case SSL_ST_OK | SSL_ST_ACCEPT:
173 cb(s, SSL_CB_HANDSHAKE_START, 1);
175 /* s->version=SSL3_VERSION; */
176 s->type = SSL_ST_ACCEPT;
178 if (s->init_buf == NULL) {
179 if ((buf = BUF_MEM_new()) == NULL) {
183 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
191 ssl3_init_finished_mac(s);
193 s->state = SSL23_ST_SR_CLNT_HELLO_A;
194 s->ctx->stats.sess_accept++;
198 case SSL23_ST_SR_CLNT_HELLO_A:
199 case SSL23_ST_SR_CLNT_HELLO_B:
202 ret = ssl23_get_client_hello(s);
209 SSLerr(SSL_F_SSL23_ACCEPT, SSL_R_UNKNOWN_STATE);
215 if ((cb != NULL) && (s->state != state)) {
216 new_state = s->state;
218 cb(s, SSL_CB_ACCEPT_LOOP, 1);
219 s->state = new_state;
225 cb(s, SSL_CB_ACCEPT_EXIT, ret);
229 int ssl23_get_client_hello(SSL *s)
232 * Request this many bytes in initial read.
233 * We can detect SSL 3.0/TLS 1.0 Client Hellos
234 * ('type == 3') correctly only when the following
235 * is in a single record, which is not guaranteed by
236 * the protocol specification:
239 * 1/2 version > record header
242 * 6-8 length > Client Hello message
243 * 9/10 client_version /
246 char *buf = &(buf_space[0]);
247 unsigned char *p, *d, *d_len, *dd;
249 unsigned int csl, sil, cl;
254 if (s->state == SSL23_ST_SR_CLNT_HELLO_A) {
255 /* read the initial header */
258 if (!ssl3_setup_buffers(s))
261 n = ssl23_read_bytes(s, sizeof buf_space);
262 if (n != sizeof buf_space)
263 return (n); /* n == -1 || n == 0 */
269 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) {
273 if ((p[3] == 0x00) && (p[4] == 0x02)) {
277 } else if (p[3] == SSL3_VERSION_MAJOR) {
281 if (p[4] >= TLS1_VERSION_MINOR) {
282 if (p[4] >= TLS1_2_VERSION_MINOR &&
283 !(s->options & SSL_OP_NO_TLSv1_2)) {
284 s->version = TLS1_2_VERSION;
285 s->state = SSL23_ST_SR_CLNT_HELLO_B;
286 } else if (p[4] >= TLS1_1_VERSION_MINOR &&
287 !(s->options & SSL_OP_NO_TLSv1_1)) {
288 s->version = TLS1_1_VERSION;
292 * done later to survive restarts
294 s->state = SSL23_ST_SR_CLNT_HELLO_B;
295 } else if (!(s->options & SSL_OP_NO_TLSv1)) {
296 s->version = TLS1_VERSION;
300 * done later to survive restarts
302 s->state = SSL23_ST_SR_CLNT_HELLO_B;
303 } else if (!(s->options & SSL_OP_NO_SSLv3)) {
304 s->version = SSL3_VERSION;
306 s->state = SSL23_ST_SR_CLNT_HELLO_B;
308 } else if (!(s->options & SSL_OP_NO_SSLv3)) {
309 s->version = SSL3_VERSION;
311 s->state = SSL23_ST_SR_CLNT_HELLO_B;
315 /* p[4] < 5 ... silly record length? */
316 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
317 (p[1] == SSL3_VERSION_MAJOR) &&
318 (p[5] == SSL3_MT_CLIENT_HELLO) && ((p[3] == 0 && p[4] < 5)
319 || (p[9] >= p[1]))) {
321 * SSLv3 or tls1 header
324 v[0] = p[1]; /* major version (= SSL3_VERSION_MAJOR) */
326 * We must look at client_version inside the Client Hello message
327 * to get the correct minor version. However if we have only a
328 * pathologically small fragment of the Client Hello message, this
329 * would be difficult, and we'd have to read more records to find
330 * out. No known SSL 3.0 client fragments ClientHello like this,
331 * so we simply reject such connections to avoid protocol version
334 if (p[3] == 0 && p[4] < 6) {
335 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_SMALL);
339 * if major version number > 3 set minor to a value which will
340 * use the highest version 3 we support. If TLS 2.0 ever appears
341 * we will need to revise this....
343 if (p[9] > SSL3_VERSION_MAJOR)
346 v[1] = p[10]; /* minor version according to client_version */
347 if (v[1] >= TLS1_VERSION_MINOR) {
348 if (v[1] >= TLS1_2_VERSION_MINOR &&
349 !(s->options & SSL_OP_NO_TLSv1_2)) {
350 s->version = TLS1_2_VERSION;
352 } else if (v[1] >= TLS1_1_VERSION_MINOR &&
353 !(s->options & SSL_OP_NO_TLSv1_1)) {
354 s->version = TLS1_1_VERSION;
356 } else if (!(s->options & SSL_OP_NO_TLSv1)) {
357 s->version = TLS1_VERSION;
359 } else if (!(s->options & SSL_OP_NO_SSLv3)) {
360 s->version = SSL3_VERSION;
364 /* client requests SSL 3.0 */
365 if (!(s->options & SSL_OP_NO_SSLv3)) {
366 s->version = SSL3_VERSION;
368 } else if (!(s->options & SSL_OP_NO_TLSv1)) {
370 * we won't be able to use TLS of course, but this will
371 * send an appropriate alert
373 s->version = TLS1_VERSION;
377 } else if ((strncmp("GET ", (char *)p, 4) == 0) ||
378 (strncmp("POST ", (char *)p, 5) == 0) ||
379 (strncmp("HEAD ", (char *)p, 5) == 0) ||
380 (strncmp("PUT ", (char *)p, 4) == 0)) {
381 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTP_REQUEST);
383 } else if (strncmp("CONNECT", (char *)p, 7) == 0) {
384 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTPS_PROXY_REQUEST);
389 /* ensure that TLS_MAX_VERSION is up-to-date */
390 OPENSSL_assert(s->version <= TLS_MAX_VERSION);
392 if (s->version < TLS1_2_VERSION && tls1_suiteb(s)) {
393 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
394 SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
398 if (FIPS_mode() && (s->version < TLS1_VERSION)) {
399 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
400 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
404 if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) {
405 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_VERSION_TOO_LOW);
409 if (s->state == SSL23_ST_SR_CLNT_HELLO_B) {
411 * we have SSLv3/TLSv1 in an SSLv2 header (other cases skip this
417 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
421 * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
422 * header is sent directly on the wire, not wrapped as a TLS
423 * record. It's format is:
428 * 5-6 cipher_spec_length
429 * 7-8 session_id_length
430 * 9-10 challenge_length
433 n = ((p[0] & 0x7f) << 8) | p[1];
434 if (n > (1024 * 4)) {
435 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_LARGE);
439 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
440 SSL_R_RECORD_LENGTH_MISMATCH);
444 j = ssl23_read_bytes(s, n + 2);
446 * We previously read 11 bytes, so if j > 0, we must have j == n+2 ==
447 * s->packet_length. We have at least 11 valid packet bytes.
452 ssl3_finish_mac(s, s->packet + 2, s->packet_length - 2);
456 s->msg_callback(0, SSL2_VERSION, 0, s->packet + 2,
457 s->packet_length - 2, s, s->msg_callback_arg);
464 d = (unsigned char *)s->init_buf->data;
465 if ((csl + sil + cl + 11) != s->packet_length) { /* We can't have TLS
473 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
474 SSL_R_RECORD_LENGTH_MISMATCH);
478 /* record header: msg_type ... */
479 *(d++) = SSL3_MT_CLIENT_HELLO;
480 /* ... and length (actual value will be written later) */
485 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
488 /* lets populate the random area */
489 /* get the challenge_length */
490 i = (cl > SSL3_RANDOM_SIZE) ? SSL3_RANDOM_SIZE : cl;
491 memset(d, 0, SSL3_RANDOM_SIZE);
492 memcpy(&(d[SSL3_RANDOM_SIZE - i]), &(p[csl + sil]), i);
493 d += SSL3_RANDOM_SIZE;
495 /* no session-id reuse */
502 for (i = 0; i < csl; i += 3) {
516 /* copy any remaining data with may be extensions */
517 p = p + csl + sil + cl;
518 while (p < s->packet + s->packet_length) {
523 i = (d - (unsigned char *)s->init_buf->data) - 4;
524 l2n3((long)i, d_len);
526 /* get the data reused from the init_buf */
527 s->s3->tmp.reuse_message = 1;
528 s->s3->tmp.message_type = SSL3_MT_CLIENT_HELLO;
529 s->s3->tmp.message_size = i;
532 /* imaginary new state (for program structure): */
533 /* s->state = SSL23_SR_CLNT_HELLO_C */
535 if ((type == 2) || (type == 3)) {
537 * we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style)
539 const SSL_METHOD *new_method;
540 new_method = ssl23_get_server_method(s->version);
541 if (new_method == NULL) {
542 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
545 s->method = new_method;
547 if (!ssl_init_wbio_buffer(s, 1))
550 /* we are in this state */
551 s->state = SSL3_ST_SR_CLNT_HELLO_A;
555 * put the 'n' bytes we have read into the input buffer for SSLv3
557 s->rstate = SSL_ST_READ_HEADER;
558 s->packet_length = n;
559 if (s->s3->rbuf.buf == NULL)
560 if (!ssl3_setup_read_buffer(s))
563 s->packet = &(s->s3->rbuf.buf[0]);
564 memcpy(s->packet, buf, n);
565 s->s3->rbuf.left = n;
566 s->s3->rbuf.offset = 0;
568 s->packet_length = 0;
569 s->s3->rbuf.left = 0;
570 s->s3->rbuf.offset = 0;
572 s->handshake_func = s->method->ssl_accept;
575 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
580 if (buf != buf_space)
582 return (SSL_accept(s));
584 if (buf != buf_space)