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 ssl3_init_finished_mac(s
);
200 s
->state
= SSL23_ST_SR_CLNT_HELLO_A
;
201 s
->ctx
->stats
.sess_accept
++;
205 case SSL23_ST_SR_CLNT_HELLO_A
:
206 case SSL23_ST_SR_CLNT_HELLO_B
:
209 ret
= ssl23_get_client_hello(s
);
216 SSLerr(SSL_F_SSL23_ACCEPT
, SSL_R_UNKNOWN_STATE
);
222 if ((cb
!= NULL
) && (s
->state
!= state
)) {
223 new_state
= s
->state
;
225 cb(s
, SSL_CB_ACCEPT_LOOP
, 1);
226 s
->state
= new_state
;
232 cb(s
, SSL_CB_ACCEPT_EXIT
, ret
);
236 int ssl23_get_client_hello(SSL
*s
)
239 * Request this many bytes in initial read.
240 * We can detect SSL 3.0/TLS 1.0 Client Hellos
241 * ('type == 3') correctly only when the following
242 * is in a single record, which is not guaranteed by
243 * the protocol specification:
246 * 1/2 version > record header
249 * 6-8 length > Client Hello message
250 * 9/10 client_version /
253 char *buf
= &(buf_space
[0]);
254 unsigned char *p
, *d
, *d_len
, *dd
;
256 unsigned int csl
, sil
, cl
;
261 if (s
->state
== SSL23_ST_SR_CLNT_HELLO_A
) {
262 /* read the initial header */
265 if (!ssl3_setup_buffers(s
))
268 n
= ssl23_read_bytes(s
, sizeof buf_space
);
269 if (n
!= sizeof buf_space
)
270 return (n
); /* n == -1 || n == 0 */
276 if ((p
[0] & 0x80) && (p
[2] == SSL2_MT_CLIENT_HELLO
)) {
280 if ((p
[3] == 0x00) && (p
[4] == 0x02)) {
284 if (!(s
->options
& SSL_OP_NO_SSLv2
))
286 } else if (p
[3] == SSL3_VERSION_MAJOR
) {
290 if (p
[4] >= TLS1_VERSION_MINOR
) {
291 if (p
[4] >= TLS1_2_VERSION_MINOR
&&
292 !(s
->options
& SSL_OP_NO_TLSv1_2
)) {
293 s
->version
= TLS1_2_VERSION
;
294 s
->state
= SSL23_ST_SR_CLNT_HELLO_B
;
295 } else if (p
[4] >= TLS1_1_VERSION_MINOR
&&
296 !(s
->options
& SSL_OP_NO_TLSv1_1
)) {
297 s
->version
= TLS1_1_VERSION
;
301 * done later to survive restarts
303 s
->state
= SSL23_ST_SR_CLNT_HELLO_B
;
304 } else if (!(s
->options
& SSL_OP_NO_TLSv1
)) {
305 s
->version
= TLS1_VERSION
;
309 * done later to survive restarts
311 s
->state
= SSL23_ST_SR_CLNT_HELLO_B
;
312 } else if (!(s
->options
& SSL_OP_NO_SSLv3
)) {
313 s
->version
= SSL3_VERSION
;
315 s
->state
= SSL23_ST_SR_CLNT_HELLO_B
;
316 } else if (!(s
->options
& SSL_OP_NO_SSLv2
)) {
319 } else if (!(s
->options
& SSL_OP_NO_SSLv3
)) {
320 s
->version
= SSL3_VERSION
;
322 s
->state
= SSL23_ST_SR_CLNT_HELLO_B
;
323 } else if (!(s
->options
& SSL_OP_NO_SSLv2
))
328 /* p[4] < 5 ... silly record length? */
329 else if ((p
[0] == SSL3_RT_HANDSHAKE
) &&
330 (p
[1] == SSL3_VERSION_MAJOR
) &&
331 (p
[5] == SSL3_MT_CLIENT_HELLO
) && ((p
[3] == 0 && p
[4] < 5)
332 || (p
[9] >= p
[1]))) {
334 * SSLv3 or tls1 header
337 v
[0] = p
[1]; /* major version (= SSL3_VERSION_MAJOR) */
339 * We must look at client_version inside the Client Hello message
340 * to get the correct minor version. However if we have only a
341 * pathologically small fragment of the Client Hello message, this
342 * would be difficult, and we'd have to read more records to find
343 * out. No known SSL 3.0 client fragments ClientHello like this,
344 * so we simply reject such connections to avoid protocol version
347 if (p
[3] == 0 && p
[4] < 6) {
348 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
, SSL_R_RECORD_TOO_SMALL
);
352 * if major version number > 3 set minor to a value which will
353 * use the highest version 3 we support. If TLS 2.0 ever appears
354 * we will need to revise this....
356 if (p
[9] > SSL3_VERSION_MAJOR
)
359 v
[1] = p
[10]; /* minor version according to client_version */
360 if (v
[1] >= TLS1_VERSION_MINOR
) {
361 if (v
[1] >= TLS1_2_VERSION_MINOR
&&
362 !(s
->options
& SSL_OP_NO_TLSv1_2
)) {
363 s
->version
= TLS1_2_VERSION
;
365 } else if (v
[1] >= TLS1_1_VERSION_MINOR
&&
366 !(s
->options
& SSL_OP_NO_TLSv1_1
)) {
367 s
->version
= TLS1_1_VERSION
;
369 } else if (!(s
->options
& SSL_OP_NO_TLSv1
)) {
370 s
->version
= TLS1_VERSION
;
372 } else if (!(s
->options
& SSL_OP_NO_SSLv3
)) {
373 s
->version
= SSL3_VERSION
;
377 /* client requests SSL 3.0 */
378 if (!(s
->options
& SSL_OP_NO_SSLv3
)) {
379 s
->version
= SSL3_VERSION
;
381 } else if (!(s
->options
& SSL_OP_NO_TLSv1
)) {
383 * we won't be able to use TLS of course, but this will
384 * send an appropriate alert
386 s
->version
= TLS1_VERSION
;
390 } else if ((strncmp("GET ", (char *)p
, 4) == 0) ||
391 (strncmp("POST ", (char *)p
, 5) == 0) ||
392 (strncmp("HEAD ", (char *)p
, 5) == 0) ||
393 (strncmp("PUT ", (char *)p
, 4) == 0)) {
394 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
, SSL_R_HTTP_REQUEST
);
396 } else if (strncmp("CONNECT", (char *)p
, 7) == 0) {
397 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
, SSL_R_HTTPS_PROXY_REQUEST
);
402 /* ensure that TLS_MAX_VERSION is up-to-date */
403 OPENSSL_assert(s
->version
<= TLS_MAX_VERSION
);
406 if (FIPS_mode() && (s
->version
< TLS1_VERSION
)) {
407 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
,
408 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE
);
413 if (s
->state
== SSL23_ST_SR_CLNT_HELLO_B
) {
415 * we have SSLv3/TLSv1 in an SSLv2 header (other cases skip this
421 v
[0] = p
[3]; /* == SSL3_VERSION_MAJOR */
425 * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
426 * header is sent directly on the wire, not wrapped as a TLS
427 * record. It's format is:
432 * 5-6 cipher_spec_length
433 * 7-8 session_id_length
434 * 9-10 challenge_length
437 n
= ((p
[0] & 0x7f) << 8) | p
[1];
438 if (n
> (1024 * 4)) {
439 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
, SSL_R_RECORD_TOO_LARGE
);
443 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
,
444 SSL_R_RECORD_LENGTH_MISMATCH
);
448 j
= ssl23_read_bytes(s
, n
+ 2);
450 * We previously read 11 bytes, so if j > 0, we must have j == n+2 ==
451 * s->packet_length. We have at least 11 valid packet bytes.
456 ssl3_finish_mac(s
, s
->packet
+ 2, s
->packet_length
- 2);
460 s
->msg_callback(0, SSL2_VERSION
, 0, s
->packet
+ 2,
461 s
->packet_length
- 2, s
, s
->msg_callback_arg
);
468 d
= (unsigned char *)s
->init_buf
->data
;
469 if ((csl
+ sil
+ cl
+ 11) != s
->packet_length
) { /* We can't have TLS
477 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
,
478 SSL_R_RECORD_LENGTH_MISMATCH
);
482 /* record header: msg_type ... */
483 *(d
++) = SSL3_MT_CLIENT_HELLO
;
484 /* ... and length (actual value will be written later) */
489 *(d
++) = SSL3_VERSION_MAJOR
; /* == v[0] */
492 /* lets populate the random area */
493 /* get the challenge_length */
494 i
= (cl
> SSL3_RANDOM_SIZE
) ? SSL3_RANDOM_SIZE
: cl
;
495 memset(d
, 0, SSL3_RANDOM_SIZE
);
496 memcpy(&(d
[SSL3_RANDOM_SIZE
- i
]), &(p
[csl
+ sil
]), i
);
497 d
+= SSL3_RANDOM_SIZE
;
499 /* no session-id reuse */
506 for (i
= 0; i
< csl
; i
+= 3) {
520 /* copy any remaining data with may be extensions */
521 p
= p
+ csl
+ sil
+ cl
;
522 while (p
< s
->packet
+ s
->packet_length
) {
527 i
= (d
- (unsigned char *)s
->init_buf
->data
) - 4;
528 l2n3((long)i
, d_len
);
530 /* get the data reused from the init_buf */
531 s
->s3
->tmp
.reuse_message
= 1;
532 s
->s3
->tmp
.message_type
= SSL3_MT_CLIENT_HELLO
;
533 s
->s3
->tmp
.message_size
= i
;
536 /* imaginary new state (for program structure): */
537 /* s->state = SSL23_SR_CLNT_HELLO_C */
540 #ifdef OPENSSL_NO_SSL2
541 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
, SSL_R_UNSUPPORTED_PROTOCOL
);
544 /* we are talking sslv2 */
546 * we need to clean up the SSLv3/TLSv1 setup and put in the sslv2
559 if (!BUF_MEM_grow_clean(s
->init_buf
,
560 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER
)) {
564 s
->state
= SSL2_ST_GET_CLIENT_HELLO_A
;
565 if (s
->options
& SSL_OP_NO_TLSv1
&& s
->options
& SSL_OP_NO_SSLv3
)
566 s
->s2
->ssl2_rollback
= 0;
569 * reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
570 * (SSL 3.0 draft/RFC 2246, App. E.2)
572 s
->s2
->ssl2_rollback
= 1;
575 * setup the n bytes we have read so we get them from the sslv2
578 s
->rstate
= SSL_ST_READ_HEADER
;
579 s
->packet_length
= n
;
580 s
->packet
= &(s
->s2
->rbuf
[0]);
581 memcpy(s
->packet
, buf
, n
);
582 s
->s2
->rbuf_left
= n
;
583 s
->s2
->rbuf_offs
= 0;
585 s
->method
= SSLv2_server_method();
586 s
->handshake_func
= s
->method
->ssl_accept
;
590 if ((type
== 2) || (type
== 3)) {
592 * we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style)
594 const SSL_METHOD
*new_method
;
595 new_method
= ssl23_get_server_method(s
->version
);
596 if (new_method
== NULL
) {
597 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
, SSL_R_UNSUPPORTED_PROTOCOL
);
600 s
->method
= new_method
;
602 if (!ssl_init_wbio_buffer(s
, 1))
605 /* we are in this state */
606 s
->state
= SSL3_ST_SR_CLNT_HELLO_A
;
610 * put the 'n' bytes we have read into the input buffer for SSLv3
612 s
->rstate
= SSL_ST_READ_HEADER
;
613 s
->packet_length
= n
;
614 if (s
->s3
->rbuf
.buf
== NULL
)
615 if (!ssl3_setup_read_buffer(s
))
618 s
->packet
= &(s
->s3
->rbuf
.buf
[0]);
619 memcpy(s
->packet
, buf
, n
);
620 s
->s3
->rbuf
.left
= n
;
621 s
->s3
->rbuf
.offset
= 0;
623 s
->packet_length
= 0;
624 s
->s3
->rbuf
.left
= 0;
625 s
->s3
->rbuf
.offset
= 0;
627 #if 0 /* ssl3_get_client_hello does this */
628 s
->client_version
= (v
[0] << 8) | v
[1];
630 s
->handshake_func
= s
->method
->ssl_accept
;
633 if ((type
< 1) || (type
> 3)) {
635 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
, SSL_R_UNKNOWN_PROTOCOL
);
640 if (buf
!= buf_space
)
642 return (SSL_accept(s
));
644 if (buf
!= buf_space
)