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 # include <openssl/fips.h>
122 static const SSL_METHOD *ssl23_get_server_method(int ver);
123 int ssl23_get_client_hello(SSL *s);
124 static const SSL_METHOD *ssl23_get_server_method(int ver)
126 #ifndef OPENSSL_NO_SSL2
127 if (ver == SSL2_VERSION)
128 return (SSLv2_server_method());
130 #ifndef OPENSSL_NO_SSL3
131 if (ver == SSL3_VERSION)
132 return (SSLv3_server_method());
134 if (ver == TLS1_VERSION)
135 return (TLSv1_server_method());
136 else if (ver == TLS1_1_VERSION)
137 return (TLSv1_1_server_method());
138 else if (ver == TLS1_2_VERSION)
139 return (TLSv1_2_server_method());
144 IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
146 ssl_undefined_function, ssl23_get_server_method)
148 int ssl23_accept(SSL *s)
151 unsigned long Time = (unsigned long)time(NULL);
152 void (*cb) (const SSL *ssl, int type, int val) = NULL;
154 int new_state, state;
156 RAND_add(&Time, sizeof(Time), 0);
160 if (s->info_callback != NULL)
161 cb = s->info_callback;
162 else if (s->ctx->info_callback != NULL)
163 cb = s->ctx->info_callback;
166 if (!SSL_in_init(s) || SSL_in_before(s))
175 case SSL_ST_BEFORE | SSL_ST_ACCEPT:
176 case SSL_ST_OK | SSL_ST_ACCEPT:
180 cb(s, SSL_CB_HANDSHAKE_START, 1);
182 /* s->version=SSL3_VERSION; */
183 s->type = SSL_ST_ACCEPT;
185 if (s->init_buf == NULL) {
186 if ((buf = BUF_MEM_new()) == NULL) {
190 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
198 if (!ssl3_init_finished_mac(s)) {
203 s->state = SSL23_ST_SR_CLNT_HELLO_A;
204 s->ctx->stats.sess_accept++;
208 case SSL23_ST_SR_CLNT_HELLO_A:
209 case SSL23_ST_SR_CLNT_HELLO_B:
212 ret = ssl23_get_client_hello(s);
219 SSLerr(SSL_F_SSL23_ACCEPT, SSL_R_UNKNOWN_STATE);
225 if ((cb != NULL) && (s->state != state)) {
226 new_state = s->state;
228 cb(s, SSL_CB_ACCEPT_LOOP, 1);
229 s->state = new_state;
235 cb(s, SSL_CB_ACCEPT_EXIT, ret);
239 int ssl23_get_client_hello(SSL *s)
242 * Request this many bytes in initial read.
243 * We can detect SSL 3.0/TLS 1.0 Client Hellos
244 * ('type == 3') correctly only when the following
245 * is in a single record, which is not guaranteed by
246 * the protocol specification:
249 * 1/2 version > record header
252 * 6-8 length > Client Hello message
253 * 9/10 client_version /
256 char *buf = &(buf_space[0]);
257 unsigned char *p, *d, *d_len, *dd;
259 unsigned int csl, sil, cl;
264 if (s->state == SSL23_ST_SR_CLNT_HELLO_A) {
265 /* read the initial header */
268 if (!ssl3_setup_buffers(s))
271 n = ssl23_read_bytes(s, sizeof buf_space);
272 if (n != sizeof buf_space)
273 return (n); /* n == -1 || n == 0 */
279 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) {
283 if ((p[3] == 0x00) && (p[4] == 0x02)) {
287 if (!(s->options & SSL_OP_NO_SSLv2))
289 } else if (p[3] == SSL3_VERSION_MAJOR) {
293 if (p[4] >= TLS1_VERSION_MINOR) {
294 if (p[4] >= TLS1_2_VERSION_MINOR &&
295 !(s->options & SSL_OP_NO_TLSv1_2)) {
296 s->version = TLS1_2_VERSION;
297 s->state = SSL23_ST_SR_CLNT_HELLO_B;
298 } else if (p[4] >= TLS1_1_VERSION_MINOR &&
299 !(s->options & SSL_OP_NO_TLSv1_1)) {
300 s->version = TLS1_1_VERSION;
304 * done later to survive restarts
306 s->state = SSL23_ST_SR_CLNT_HELLO_B;
307 } else if (!(s->options & SSL_OP_NO_TLSv1)) {
308 s->version = TLS1_VERSION;
312 * done later to survive restarts
314 s->state = SSL23_ST_SR_CLNT_HELLO_B;
315 } else if (!(s->options & SSL_OP_NO_SSLv3)) {
316 s->version = SSL3_VERSION;
318 s->state = SSL23_ST_SR_CLNT_HELLO_B;
319 } else if (!(s->options & SSL_OP_NO_SSLv2)) {
322 } else if (!(s->options & SSL_OP_NO_SSLv3)) {
323 s->version = SSL3_VERSION;
325 s->state = SSL23_ST_SR_CLNT_HELLO_B;
326 } else if (!(s->options & SSL_OP_NO_SSLv2))
331 /* p[4] < 5 ... silly record length? */
332 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
333 (p[1] == SSL3_VERSION_MAJOR) &&
334 (p[5] == SSL3_MT_CLIENT_HELLO) && ((p[3] == 0 && p[4] < 5)
335 || (p[9] >= p[1]))) {
337 * SSLv3 or tls1 header
340 v[0] = p[1]; /* major version (= SSL3_VERSION_MAJOR) */
342 * We must look at client_version inside the Client Hello message
343 * to get the correct minor version. However if we have only a
344 * pathologically small fragment of the Client Hello message, this
345 * would be difficult, and we'd have to read more records to find
346 * out. No known SSL 3.0 client fragments ClientHello like this,
347 * so we simply reject such connections to avoid protocol version
350 if (p[3] == 0 && p[4] < 6) {
351 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_SMALL);
355 * if major version number > 3 set minor to a value which will
356 * use the highest version 3 we support. If TLS 2.0 ever appears
357 * we will need to revise this....
359 if (p[9] > SSL3_VERSION_MAJOR)
362 v[1] = p[10]; /* minor version according to client_version */
363 if (v[1] >= TLS1_VERSION_MINOR) {
364 if (v[1] >= TLS1_2_VERSION_MINOR &&
365 !(s->options & SSL_OP_NO_TLSv1_2)) {
366 s->version = TLS1_2_VERSION;
368 } else if (v[1] >= TLS1_1_VERSION_MINOR &&
369 !(s->options & SSL_OP_NO_TLSv1_1)) {
370 s->version = TLS1_1_VERSION;
372 } else if (!(s->options & SSL_OP_NO_TLSv1)) {
373 s->version = TLS1_VERSION;
375 } else if (!(s->options & SSL_OP_NO_SSLv3)) {
376 s->version = SSL3_VERSION;
380 /* client requests SSL 3.0 */
381 if (!(s->options & SSL_OP_NO_SSLv3)) {
382 s->version = SSL3_VERSION;
384 } else if (!(s->options & SSL_OP_NO_TLSv1)) {
386 * we won't be able to use TLS of course, but this will
387 * send an appropriate alert
389 s->version = TLS1_VERSION;
393 } else if ((strncmp("GET ", (char *)p, 4) == 0) ||
394 (strncmp("POST ", (char *)p, 5) == 0) ||
395 (strncmp("HEAD ", (char *)p, 5) == 0) ||
396 (strncmp("PUT ", (char *)p, 4) == 0)) {
397 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTP_REQUEST);
399 } else if (strncmp("CONNECT", (char *)p, 7) == 0) {
400 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTPS_PROXY_REQUEST);
405 /* ensure that TLS_MAX_VERSION is up-to-date */
406 OPENSSL_assert(s->version <= TLS_MAX_VERSION);
408 if (s->version < TLS1_2_VERSION && tls1_suiteb(s)) {
409 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
410 SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
414 if (FIPS_mode() && (s->version < TLS1_VERSION)) {
415 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
416 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
421 if (s->state == SSL23_ST_SR_CLNT_HELLO_B) {
423 * we have SSLv3/TLSv1 in an SSLv2 header (other cases skip this
429 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
433 * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
434 * header is sent directly on the wire, not wrapped as a TLS
435 * record. It's format is:
440 * 5-6 cipher_spec_length
441 * 7-8 session_id_length
442 * 9-10 challenge_length
445 n = ((p[0] & 0x7f) << 8) | p[1];
446 if (n > (1024 * 4)) {
447 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_LARGE);
451 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
452 SSL_R_RECORD_LENGTH_MISMATCH);
456 j = ssl23_read_bytes(s, n + 2);
458 * We previously read 11 bytes, so if j > 0, we must have j == n+2 ==
459 * s->packet_length. We have at least 11 valid packet bytes.
464 ssl3_finish_mac(s, s->packet + 2, s->packet_length - 2);
468 s->msg_callback(0, SSL2_VERSION, 0, s->packet + 2,
469 s->packet_length - 2, s, s->msg_callback_arg);
476 d = (unsigned char *)s->init_buf->data;
477 if ((csl + sil + cl + 11) != s->packet_length) { /* We can't have TLS
485 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
486 SSL_R_RECORD_LENGTH_MISMATCH);
490 /* record header: msg_type ... */
491 *(d++) = SSL3_MT_CLIENT_HELLO;
492 /* ... and length (actual value will be written later) */
497 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
500 /* lets populate the random area */
501 /* get the challenge_length */
502 i = (cl > SSL3_RANDOM_SIZE) ? SSL3_RANDOM_SIZE : cl;
503 memset(d, 0, SSL3_RANDOM_SIZE);
504 memcpy(&(d[SSL3_RANDOM_SIZE - i]), &(p[csl + sil]), i);
505 d += SSL3_RANDOM_SIZE;
507 /* no session-id reuse */
514 for (i = 0; i < csl; i += 3) {
528 /* copy any remaining data with may be extensions */
529 p = p + csl + sil + cl;
530 while (p < s->packet + s->packet_length) {
535 i = (d - (unsigned char *)s->init_buf->data) - 4;
536 l2n3((long)i, d_len);
538 /* get the data reused from the init_buf */
539 s->s3->tmp.reuse_message = 1;
540 s->s3->tmp.message_type = SSL3_MT_CLIENT_HELLO;
541 s->s3->tmp.message_size = i;
544 /* imaginary new state (for program structure): */
545 /* s->state = SSL23_SR_CLNT_HELLO_C */
548 #ifdef OPENSSL_NO_SSL2
549 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
552 /* we are talking sslv2 */
554 * we need to clean up the SSLv3/TLSv1 setup and put in the sslv2
567 if (!BUF_MEM_grow_clean(s->init_buf,
568 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) {
572 s->state = SSL2_ST_GET_CLIENT_HELLO_A;
573 if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3)
574 s->s2->ssl2_rollback = 0;
577 * reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
578 * (SSL 3.0 draft/RFC 2246, App. E.2)
580 s->s2->ssl2_rollback = 1;
583 * setup the n bytes we have read so we get them from the sslv2
586 s->rstate = SSL_ST_READ_HEADER;
587 s->packet_length = n;
588 s->packet = &(s->s2->rbuf[0]);
589 memcpy(s->packet, buf, n);
590 s->s2->rbuf_left = n;
591 s->s2->rbuf_offs = 0;
593 s->method = SSLv2_server_method();
594 s->handshake_func = s->method->ssl_accept;
598 if ((type == 2) || (type == 3)) {
600 * we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style)
602 const SSL_METHOD *new_method;
603 new_method = ssl23_get_server_method(s->version);
604 if (new_method == NULL) {
605 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
608 s->method = new_method;
610 if (!ssl_init_wbio_buffer(s, 1))
613 /* we are in this state */
614 s->state = SSL3_ST_SR_CLNT_HELLO_A;
618 * put the 'n' bytes we have read into the input buffer for SSLv3
620 s->rstate = SSL_ST_READ_HEADER;
621 s->packet_length = n;
622 if (s->s3->rbuf.buf == NULL)
623 if (!ssl3_setup_read_buffer(s))
626 s->packet = &(s->s3->rbuf.buf[0]);
627 memcpy(s->packet, buf, n);
628 s->s3->rbuf.left = n;
629 s->s3->rbuf.offset = 0;
631 s->packet_length = 0;
632 s->s3->rbuf.left = 0;
633 s->s3->rbuf.offset = 0;
635 #if 0 /* ssl3_get_client_hello does this */
636 s->client_version = (v[0] << 8) | v[1];
638 s->handshake_func = s->method->ssl_accept;
641 if ((type < 1) || (type > 3)) {
643 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
648 if (buf != buf_space)
650 return (SSL_accept(s));
652 if (buf != buf_space)