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 if (ver
== SSL3_VERSION
)
131 return(SSLv3_server_method());
132 else if (ver
== TLS1_VERSION
)
133 return(TLSv1_server_method());
134 else if (ver
== TLS1_1_VERSION
)
135 return(TLSv1_1_server_method());
136 else if (ver
== TLS1_2_VERSION
)
137 return(TLSv1_2_server_method());
142 IMPLEMENT_ssl23_meth_func(SSLv23_server_method
,
144 ssl_undefined_function
,
145 ssl23_get_server_method
)
147 int ssl23_accept(SSL
*s
)
150 unsigned long Time
=(unsigned long)time(NULL
);
151 void (*cb
)(const SSL
*ssl
,int type
,int val
)=NULL
;
155 RAND_add(&Time
,sizeof(Time
),0);
159 if (s
->info_callback
!= NULL
)
161 else if (s
->ctx
->info_callback
!= NULL
)
162 cb
=s
->ctx
->info_callback
;
165 if (!SSL_in_init(s
) || SSL_in_before(s
)) SSL_clear(s
);
175 case SSL_ST_BEFORE
|SSL_ST_ACCEPT
:
176 case SSL_ST_OK
|SSL_ST_ACCEPT
:
179 if (cb
!= NULL
) cb(s
,SSL_CB_HANDSHAKE_START
,1);
181 /* s->version=SSL3_VERSION; */
182 s
->type
=SSL_ST_ACCEPT
;
184 if (s
->init_buf
== NULL
)
186 if ((buf
=BUF_MEM_new()) == NULL
)
191 if (!BUF_MEM_grow(buf
,SSL3_RT_MAX_PLAIN_LENGTH
))
199 ssl3_init_finished_mac(s
);
201 s
->state
=SSL23_ST_SR_CLNT_HELLO_A
;
202 s
->ctx
->stats
.sess_accept
++;
206 case SSL23_ST_SR_CLNT_HELLO_A
:
207 case SSL23_ST_SR_CLNT_HELLO_B
:
210 ret
=ssl23_get_client_hello(s
);
211 if (ret
>= 0) cb
=NULL
;
216 SSLerr(SSL_F_SSL23_ACCEPT
,SSL_R_UNKNOWN_STATE
);
222 if ((cb
!= NULL
) && (s
->state
!= state
))
226 cb(s
,SSL_CB_ACCEPT_LOOP
,1);
233 cb(s
,SSL_CB_ACCEPT_EXIT
,ret
);
238 int ssl23_get_client_hello(SSL
*s
)
240 char buf_space
[11]; /* Request this many bytes in initial read.
241 * We can detect SSL 3.0/TLS 1.0 Client Hellos
242 * ('type == 3') correctly only when the following
243 * is in a single record, which is not guaranteed by
244 * the protocol specification:
247 * 1/2 version > record header
250 * 6-8 length > Client Hello message
251 * 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
)
263 /* read the initial header */
266 if (!ssl3_setup_buffers(s
)) goto err
;
268 n
=ssl23_read_bytes(s
, sizeof buf_space
);
269 if (n
!= sizeof buf_space
) return(n
); /* n == -1 || n == 0 */
275 if ((p
[0] & 0x80) && (p
[2] == SSL2_MT_CLIENT_HELLO
))
280 if ((p
[3] == 0x00) && (p
[4] == 0x02))
282 v
[0]=p
[3]; v
[1]=p
[4];
284 if (!(s
->options
& SSL_OP_NO_SSLv2
))
287 else if (p
[3] == SSL3_VERSION_MAJOR
)
289 v
[0]=p
[3]; v
[1]=p
[4];
291 if (p
[4] >= TLS1_VERSION_MINOR
)
293 if (p
[4] >= TLS1_2_VERSION_MINOR
&&
294 !(s
->options
& SSL_OP_NO_TLSv1_2
))
296 s
->version
=TLS1_2_VERSION
;
297 s
->state
=SSL23_ST_SR_CLNT_HELLO_B
;
299 else if (p
[4] >= TLS1_1_VERSION_MINOR
&&
300 !(s
->options
& SSL_OP_NO_TLSv1_1
))
302 s
->version
=TLS1_1_VERSION
;
303 /* type=2; */ /* done later to survive restarts */
304 s
->state
=SSL23_ST_SR_CLNT_HELLO_B
;
306 else if (!(s
->options
& SSL_OP_NO_TLSv1
))
308 s
->version
=TLS1_VERSION
;
309 /* type=2; */ /* done later to survive restarts */
310 s
->state
=SSL23_ST_SR_CLNT_HELLO_B
;
312 else if (!(s
->options
& SSL_OP_NO_SSLv3
))
314 s
->version
=SSL3_VERSION
;
316 s
->state
=SSL23_ST_SR_CLNT_HELLO_B
;
318 else if (!(s
->options
& SSL_OP_NO_SSLv2
))
323 else if (!(s
->options
& SSL_OP_NO_SSLv3
))
325 s
->version
=SSL3_VERSION
;
327 s
->state
=SSL23_ST_SR_CLNT_HELLO_B
;
329 else if (!(s
->options
& SSL_OP_NO_SSLv2
))
334 else if ((p
[0] == SSL3_RT_HANDSHAKE
) &&
335 (p
[1] == SSL3_VERSION_MAJOR
) &&
336 (p
[5] == SSL3_MT_CLIENT_HELLO
) &&
337 ((p
[3] == 0 && p
[4] < 5 /* silly record length? */)
341 * SSLv3 or tls1 header
344 v
[0]=p
[1]; /* major version (= SSL3_VERSION_MAJOR) */
345 /* We must look at client_version inside the Client Hello message
346 * to get the correct minor version.
347 * However if we have only a pathologically small fragment of the
348 * Client Hello message, this would be difficult, and we'd have
349 * to read more records to find out.
350 * No known SSL 3.0 client fragments ClientHello like this,
351 * so we simply reject such connections to avoid
352 * protocol version downgrade attacks. */
353 if (p
[3] == 0 && p
[4] < 6)
355 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
,SSL_R_RECORD_TOO_SMALL
);
358 /* if major version number > 3 set minor to a value
359 * which will use the highest version 3 we support.
360 * If TLS 2.0 ever appears we will need to revise
363 if (p
[9] > SSL3_VERSION_MAJOR
)
366 v
[1]=p
[10]; /* minor version according to client_version */
367 if (v
[1] >= TLS1_VERSION_MINOR
)
369 if (v
[1] >= TLS1_2_VERSION_MINOR
&&
370 !(s
->options
& SSL_OP_NO_TLSv1_2
))
372 s
->version
=TLS1_2_VERSION
;
375 else if (v
[1] >= TLS1_1_VERSION_MINOR
&&
376 !(s
->options
& SSL_OP_NO_TLSv1_1
))
378 s
->version
=TLS1_1_VERSION
;
381 else if (!(s
->options
& SSL_OP_NO_TLSv1
))
383 s
->version
=TLS1_VERSION
;
386 else if (!(s
->options
& SSL_OP_NO_SSLv3
))
388 s
->version
=SSL3_VERSION
;
394 /* client requests SSL 3.0 */
395 if (!(s
->options
& SSL_OP_NO_SSLv3
))
397 s
->version
=SSL3_VERSION
;
400 else if (!(s
->options
& SSL_OP_NO_TLSv1
))
402 /* we won't be able to use TLS of course,
403 * but this will send an appropriate alert */
404 s
->version
=TLS1_VERSION
;
409 else if ((strncmp("GET ", (char *)p
,4) == 0) ||
410 (strncmp("POST ",(char *)p
,5) == 0) ||
411 (strncmp("HEAD ",(char *)p
,5) == 0) ||
412 (strncmp("PUT ", (char *)p
,4) == 0))
414 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
,SSL_R_HTTP_REQUEST
);
417 else if (strncmp("CONNECT",(char *)p
,7) == 0)
419 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
,SSL_R_HTTPS_PROXY_REQUEST
);
424 /* ensure that TLS_MAX_VERSION is up-to-date */
425 OPENSSL_assert(s
->version
<= TLS_MAX_VERSION
);
428 if (FIPS_mode() && (s
->version
< TLS1_VERSION
))
430 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
,
431 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE
);
436 if (s
->state
== SSL23_ST_SR_CLNT_HELLO_B
)
438 /* we have SSLv3/TLSv1 in an SSLv2 header
439 * (other cases skip this state) */
443 v
[0] = p
[3]; /* == SSL3_VERSION_MAJOR */
446 /* An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
447 * header is sent directly on the wire, not wrapped as a TLS
448 * record. It's format is:
453 * 5-6 cipher_spec_length
454 * 7-8 session_id_length
455 * 9-10 challenge_length
458 n
=((p
[0]&0x7f)<<8)|p
[1];
461 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
,SSL_R_RECORD_TOO_LARGE
);
466 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
,SSL_R_RECORD_LENGTH_MISMATCH
);
470 j
=ssl23_read_bytes(s
,n
+2);
471 /* We previously read 11 bytes, so if j > 0, we must have
472 * j == n+2 == s->packet_length. We have at least 11 valid
474 if (j
<= 0) return(j
);
476 ssl3_finish_mac(s
, s
->packet
+2, s
->packet_length
-2);
478 s
->msg_callback(0, SSL2_VERSION
, 0, s
->packet
+2, s
->packet_length
-2, s
, s
->msg_callback_arg
); /* CLIENT-HELLO */
485 d
=(unsigned char *)s
->init_buf
->data
;
486 if ((csl
+sil
+cl
+11) != s
->packet_length
) /* We can't have TLS extensions in SSL 2.0 format
487 * Client Hello, can we? Error condition should be
490 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
,SSL_R_RECORD_LENGTH_MISMATCH
);
494 /* record header: msg_type ... */
495 *(d
++) = SSL3_MT_CLIENT_HELLO
;
496 /* ... and length (actual value will be written later) */
501 *(d
++) = SSL3_VERSION_MAJOR
; /* == v[0] */
504 /* lets populate the random area */
505 /* get the challenge_length */
506 i
=(cl
> SSL3_RANDOM_SIZE
)?SSL3_RANDOM_SIZE
:cl
;
507 memset(d
,0,SSL3_RANDOM_SIZE
);
508 memcpy(&(d
[SSL3_RANDOM_SIZE
-i
]),&(p
[csl
+sil
]),i
);
511 /* no session-id reuse */
518 for (i
=0; i
<csl
; i
+=3)
520 if (p
[i
] != 0) continue;
532 /* copy any remaining data with may be extensions */
534 while (p
< s
->packet
+s
->packet_length
)
540 i
= (d
-(unsigned char *)s
->init_buf
->data
) - 4;
541 l2n3((long)i
, d_len
);
543 /* get the data reused from the init_buf */
544 s
->s3
->tmp
.reuse_message
=1;
545 s
->s3
->tmp
.message_type
=SSL3_MT_CLIENT_HELLO
;
546 s
->s3
->tmp
.message_size
=i
;
549 /* imaginary new state (for program structure): */
550 /* s->state = SSL23_SR_CLNT_HELLO_C */
554 #ifdef OPENSSL_NO_SSL2
555 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
,SSL_R_UNSUPPORTED_PROTOCOL
);
558 /* we are talking sslv2 */
559 /* we need to clean up the SSLv3/TLSv1 setup and put in the
570 if (s
->s3
!= NULL
) ssl3_free(s
);
572 if (!BUF_MEM_grow_clean(s
->init_buf
,
573 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER
))
578 s
->state
=SSL2_ST_GET_CLIENT_HELLO_A
;
579 if (s
->options
& SSL_OP_NO_TLSv1
&& s
->options
& SSL_OP_NO_SSLv3
)
580 s
->s2
->ssl2_rollback
=0;
582 /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
583 * (SSL 3.0 draft/RFC 2246, App. E.2) */
584 s
->s2
->ssl2_rollback
=1;
586 /* setup the n bytes we have read so we get them from
587 * the sslv2 buffer */
588 s
->rstate
=SSL_ST_READ_HEADER
;
590 s
->packet
= &(s
->s2
->rbuf
[0]);
591 memcpy(s
->packet
,buf
,n
);
595 s
->method
=SSLv2_server_method();
596 s
->handshake_func
=s
->method
->ssl_accept
;
600 if ((type
== 2) || (type
== 3))
602 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
604 if (!ssl_init_wbio_buffer(s
,1)) goto err
;
606 /* we are in this state */
607 s
->state
=SSL3_ST_SR_CLNT_HELLO_A
;
611 /* put the 'n' bytes we have read into the input buffer
613 s
->rstate
=SSL_ST_READ_HEADER
;
615 if (s
->s3
->rbuf
.buf
== NULL
)
616 if (!ssl3_setup_read_buffer(s
))
619 s
->packet
= &(s
->s3
->rbuf
.buf
[0]);
620 memcpy(s
->packet
,buf
,n
);
622 s
->s3
->rbuf
.offset
=0;
628 s
->s3
->rbuf
.offset
=0;
630 if (s
->version
== TLS1_2_VERSION
)
631 s
->method
= TLSv1_2_server_method();
632 else if (s
->version
== TLS1_1_VERSION
)
633 s
->method
= TLSv1_1_server_method();
634 else if (s
->version
== TLS1_VERSION
)
635 s
->method
= TLSv1_server_method();
637 s
->method
= SSLv3_server_method();
638 #if 0 /* ssl3_get_client_hello does this */
639 s
->client_version
=(v
[0]<<8)|v
[1];
641 s
->handshake_func
=s
->method
->ssl_accept
;
644 if ((type
< 1) || (type
> 3))
647 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO
,SSL_R_UNKNOWN_PROTOCOL
);
652 if (buf
!= buf_space
) OPENSSL_free(buf
);
653 return(SSL_accept(s
));
655 if (buf
!= buf_space
) OPENSSL_free(buf
);