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) 1998-2001 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).
112 #include "ssl_locl.h"
113 #ifndef OPENSSL_NO_SSL2
115 # include <openssl/bio.h>
116 # include <openssl/rand.h>
117 # include <openssl/objects.h>
118 # include <openssl/evp.h>
120 static SSL_METHOD
*ssl2_get_server_method(int ver
);
121 static int get_client_master_key(SSL
*s
);
122 static int get_client_hello(SSL
*s
);
123 static int server_hello(SSL
*s
);
124 static int get_client_finished(SSL
*s
);
125 static int server_verify(SSL
*s
);
126 static int server_finish(SSL
*s
);
127 static int request_certificate(SSL
*s
);
128 static int ssl_rsa_private_decrypt(CERT
*c
, int len
, unsigned char *from
,
129 unsigned char *to
, int padding
);
132 static SSL_METHOD
*ssl2_get_server_method(int ver
)
134 if (ver
== SSL2_VERSION
)
135 return (SSLv2_server_method());
140 IMPLEMENT_ssl2_meth_func(SSLv2_server_method
,
142 ssl_undefined_function
, ssl2_get_server_method
)
144 int ssl2_accept(SSL
*s
)
146 unsigned long l
= (unsigned long)time(NULL
);
150 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
151 int new_state
, state
;
153 RAND_add(&l
, sizeof(l
), 0);
157 if (s
->info_callback
!= NULL
)
158 cb
= s
->info_callback
;
159 else if (s
->ctx
->info_callback
!= NULL
)
160 cb
= s
->ctx
->info_callback
;
162 /* init things to blank */
164 if (!SSL_in_init(s
) || SSL_in_before(s
))
167 if (s
->cert
== NULL
) {
168 SSLerr(SSL_F_SSL2_ACCEPT
, SSL_R_NO_CERTIFICATE_SET
);
179 case SSL_ST_BEFORE
| SSL_ST_ACCEPT
:
180 case SSL_ST_OK
| SSL_ST_ACCEPT
:
184 cb(s
, SSL_CB_HANDSHAKE_START
, 1);
186 s
->version
= SSL2_VERSION
;
187 s
->type
= SSL_ST_ACCEPT
;
190 if ((buf
== NULL
) && ((buf
= BUF_MEM_new()) == NULL
)) {
194 if (!BUF_MEM_grow(buf
, (int)
195 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER
)) {
201 s
->ctx
->stats
.sess_accept
++;
202 s
->handshake_func
= ssl2_accept
;
203 s
->state
= SSL2_ST_GET_CLIENT_HELLO_A
;
206 case SSL2_ST_GET_CLIENT_HELLO_A
:
207 case SSL2_ST_GET_CLIENT_HELLO_B
:
208 case SSL2_ST_GET_CLIENT_HELLO_C
:
210 ret
= get_client_hello(s
);
214 s
->state
= SSL2_ST_SEND_SERVER_HELLO_A
;
217 case SSL2_ST_SEND_SERVER_HELLO_A
:
218 case SSL2_ST_SEND_SERVER_HELLO_B
:
219 ret
= server_hello(s
);
224 s
->state
= SSL2_ST_GET_CLIENT_MASTER_KEY_A
;
227 s
->state
= SSL2_ST_SERVER_START_ENCRYPTION
;
230 case SSL2_ST_GET_CLIENT_MASTER_KEY_A
:
231 case SSL2_ST_GET_CLIENT_MASTER_KEY_B
:
232 ret
= get_client_master_key(s
);
236 s
->state
= SSL2_ST_SERVER_START_ENCRYPTION
;
239 case SSL2_ST_SERVER_START_ENCRYPTION
:
241 * Ok we how have sent all the stuff needed to start encrypting,
242 * the next packet back will be encrypted.
244 if (!ssl2_enc_init(s
, 0)) {
248 s
->s2
->clear_text
= 0;
249 s
->state
= SSL2_ST_SEND_SERVER_VERIFY_A
;
252 case SSL2_ST_SEND_SERVER_VERIFY_A
:
253 case SSL2_ST_SEND_SERVER_VERIFY_B
:
254 ret
= server_verify(s
);
260 * If we are in here, we have been buffering the output, so
261 * we need to flush it and remove buffering from future
264 s
->state
= SSL2_ST_SEND_SERVER_VERIFY_C
;
267 s
->state
= SSL2_ST_GET_CLIENT_FINISHED_A
;
271 case SSL2_ST_SEND_SERVER_VERIFY_C
:
272 /* get the number of bytes to write */
273 num1
= BIO_ctrl(s
->wbio
, BIO_CTRL_INFO
, 0, NULL
);
275 s
->rwstate
= SSL_WRITING
;
276 num1
= BIO_flush(s
->wbio
);
281 s
->rwstate
= SSL_NOTHING
;
284 /* flushed and now remove buffering */
285 s
->wbio
= BIO_pop(s
->wbio
);
287 s
->state
= SSL2_ST_GET_CLIENT_FINISHED_A
;
290 case SSL2_ST_GET_CLIENT_FINISHED_A
:
291 case SSL2_ST_GET_CLIENT_FINISHED_B
:
292 ret
= get_client_finished(s
);
296 s
->state
= SSL2_ST_SEND_REQUEST_CERTIFICATE_A
;
299 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A
:
300 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B
:
301 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C
:
302 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D
:
304 * don't do a 'request certificate' if we don't want to, or we
305 * already have one, and we only want to do it once.
307 if (!(s
->verify_mode
& SSL_VERIFY_PEER
) ||
308 ((s
->session
->peer
!= NULL
) &&
309 (s
->verify_mode
& SSL_VERIFY_CLIENT_ONCE
))) {
310 s
->state
= SSL2_ST_SEND_SERVER_FINISHED_A
;
313 ret
= request_certificate(s
);
317 s
->state
= SSL2_ST_SEND_SERVER_FINISHED_A
;
321 case SSL2_ST_SEND_SERVER_FINISHED_A
:
322 case SSL2_ST_SEND_SERVER_FINISHED_B
:
323 ret
= server_finish(s
);
327 s
->state
= SSL_ST_OK
;
331 BUF_MEM_free(s
->init_buf
);
332 ssl_free_wbio_buffer(s
);
335 /* ERR_clear_error(); */
337 ssl_update_cache(s
, SSL_SESS_CACHE_SERVER
);
339 s
->ctx
->stats
.sess_accept_good
++;
344 cb(s
, SSL_CB_HANDSHAKE_DONE
, 1);
350 SSLerr(SSL_F_SSL2_ACCEPT
, SSL_R_UNKNOWN_STATE
);
356 if ((cb
!= NULL
) && (s
->state
!= state
)) {
357 new_state
= s
->state
;
359 cb(s
, SSL_CB_ACCEPT_LOOP
, 1);
360 s
->state
= new_state
;
366 cb(s
, SSL_CB_ACCEPT_EXIT
, ret
);
370 static int get_client_master_key(SSL
*s
)
372 int is_export
, i
, n
, keya
, ek
;
379 p
= (unsigned char *)s
->init_buf
->data
;
380 if (s
->state
== SSL2_ST_GET_CLIENT_MASTER_KEY_A
) {
381 i
= ssl2_read(s
, (char *)&(p
[s
->init_num
]), 10 - s
->init_num
);
383 if (i
< (10 - s
->init_num
))
384 return (ssl2_part_read(s
, SSL_F_GET_CLIENT_MASTER_KEY
, i
));
387 if (*(p
++) != SSL2_MT_CLIENT_MASTER_KEY
) {
388 if (p
[-1] != SSL2_MT_ERROR
) {
389 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
390 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY
,
391 SSL_R_READ_WRONG_PACKET_TYPE
);
393 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY
, SSL_R_PEER_ERROR
);
397 cp
= ssl2_get_cipher_by_char(p
);
399 ssl2_return_error(s
, SSL2_PE_NO_CIPHER
);
400 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY
, SSL_R_NO_CIPHER_MATCH
);
403 s
->session
->cipher
= cp
;
407 s
->s2
->tmp
.clear
= i
;
411 if (i
> SSL_MAX_KEY_ARG_LENGTH
) {
412 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
413 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY
, SSL_R_KEY_ARG_TOO_LONG
);
416 s
->session
->key_arg_length
= i
;
417 s
->state
= SSL2_ST_GET_CLIENT_MASTER_KEY_B
;
420 /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
421 p
= (unsigned char *)s
->init_buf
->data
;
422 if (s
->init_buf
->length
< SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER
) {
423 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
424 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY
, ERR_R_INTERNAL_ERROR
);
427 keya
= s
->session
->key_arg_length
;
429 10 + (unsigned long)s
->s2
->tmp
.clear
+ (unsigned long)s
->s2
->tmp
.enc
+
431 if (len
> SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER
) {
432 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
433 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY
, SSL_R_MESSAGE_TOO_LONG
);
436 n
= (int)len
- s
->init_num
;
437 i
= ssl2_read(s
, (char *)&(p
[s
->init_num
]), n
);
439 return (ssl2_part_read(s
, SSL_F_GET_CLIENT_MASTER_KEY
, i
));
440 if (s
->msg_callback
) {
441 /* CLIENT-MASTER-KEY */
442 s
->msg_callback(0, s
->version
, 0, p
, (size_t)len
, s
,
443 s
->msg_callback_arg
);
447 memcpy(s
->session
->key_arg
, &(p
[s
->s2
->tmp
.clear
+ s
->s2
->tmp
.enc
]),
450 if (s
->cert
->pkeys
[SSL_PKEY_RSA_ENC
].privatekey
== NULL
) {
451 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
452 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY
, SSL_R_NO_PRIVATEKEY
);
455 i
= ssl_rsa_private_decrypt(s
->cert
, s
->s2
->tmp
.enc
,
456 &(p
[s
->s2
->tmp
.clear
]),
457 &(p
[s
->s2
->tmp
.clear
]),
458 (s
->s2
->ssl2_rollback
) ? RSA_SSLV23_PADDING
:
461 is_export
= SSL_C_IS_EXPORT(s
->session
->cipher
);
463 if (!ssl_cipher_get_evp(s
->session
, &c
, &md
, NULL
)) {
464 ssl2_return_error(s
, SSL2_PE_NO_CIPHER
);
465 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY
,
466 SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS
);
470 if (s
->session
->cipher
->algorithm2
& SSL2_CF_8_BYTE_ENC
) {
479 * If a bad decrypt, continue with protocol but with a random master
480 * secret (Bleichenbacher attack)
482 if ((i
< 0) || ((!is_export
&& (i
!= EVP_CIPHER_key_length(c
)))
483 || (is_export
&& ((i
!= ek
)
484 || (s
->s2
->tmp
.clear
+
485 (unsigned int)i
!= (unsigned int)
486 EVP_CIPHER_key_length(c
)))))) {
491 i
= EVP_CIPHER_key_length(c
);
492 if (RAND_pseudo_bytes(p
, i
) <= 0)
498 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY
, SSL_R_BAD_RSA_DECRYPT
);
500 /* incorrect number of key bytes for non export cipher */
501 else if ((!is_export
&& (i
!= EVP_CIPHER_key_length(c
)))
502 || (is_export
&& ((i
!= ek
) || (s
->s2
->tmp
.clear
+ i
!=
503 EVP_CIPHER_key_length(c
))))) {
505 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY
, SSL_R_WRONG_NUMBER_OF_KEY_BITS
);
508 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
514 i
+= s
->s2
->tmp
.clear
;
516 if (i
> SSL_MAX_MASTER_KEY_LENGTH
) {
517 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
518 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY
, ERR_R_INTERNAL_ERROR
);
521 s
->session
->master_key_length
= i
;
522 memcpy(s
->session
->master_key
, p
, (unsigned int)i
);
526 static int get_client_hello(SSL
*s
)
531 STACK_OF(SSL_CIPHER
) *cs
; /* a stack of SSL_CIPHERS */
532 STACK_OF(SSL_CIPHER
) *cl
; /* the ones we want to use */
533 STACK_OF(SSL_CIPHER
) *prio
, *allow
;
537 * This is a bit of a hack to check for the correct packet type the first
540 if (s
->state
== SSL2_ST_GET_CLIENT_HELLO_A
) {
542 s
->state
= SSL2_ST_GET_CLIENT_HELLO_B
;
545 p
= (unsigned char *)s
->init_buf
->data
;
546 if (s
->state
== SSL2_ST_GET_CLIENT_HELLO_B
) {
547 i
= ssl2_read(s
, (char *)&(p
[s
->init_num
]), 9 - s
->init_num
);
548 if (i
< (9 - s
->init_num
))
549 return (ssl2_part_read(s
, SSL_F_GET_CLIENT_HELLO
, i
));
552 if (*(p
++) != SSL2_MT_CLIENT_HELLO
) {
553 if (p
[-1] != SSL2_MT_ERROR
) {
554 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
555 SSLerr(SSL_F_GET_CLIENT_HELLO
, SSL_R_READ_WRONG_PACKET_TYPE
);
557 SSLerr(SSL_F_GET_CLIENT_HELLO
, SSL_R_PEER_ERROR
);
564 s
->s2
->tmp
.cipher_spec_length
= i
;
566 s
->s2
->tmp
.session_id_length
= i
;
568 s
->s2
->challenge_length
= i
;
569 if ((i
< SSL2_MIN_CHALLENGE_LENGTH
) ||
570 (i
> SSL2_MAX_CHALLENGE_LENGTH
)) {
571 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
572 SSLerr(SSL_F_GET_CLIENT_HELLO
, SSL_R_INVALID_CHALLENGE_LENGTH
);
575 s
->state
= SSL2_ST_GET_CLIENT_HELLO_C
;
578 /* SSL2_ST_GET_CLIENT_HELLO_C */
579 p
= (unsigned char *)s
->init_buf
->data
;
581 9 + (unsigned long)s
->s2
->tmp
.cipher_spec_length
+
582 (unsigned long)s
->s2
->challenge_length
+
583 (unsigned long)s
->s2
->tmp
.session_id_length
;
584 if (len
> SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER
) {
585 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
586 SSLerr(SSL_F_GET_CLIENT_HELLO
, SSL_R_MESSAGE_TOO_LONG
);
589 n
= (int)len
- s
->init_num
;
590 i
= ssl2_read(s
, (char *)&(p
[s
->init_num
]), n
);
592 return (ssl2_part_read(s
, SSL_F_GET_CLIENT_HELLO
, i
));
593 if (s
->msg_callback
) {
595 s
->msg_callback(0, s
->version
, 0, p
, (size_t)len
, s
,
596 s
->msg_callback_arg
);
601 * get session-id before cipher stuff so we can get out session structure
605 if ((s
->s2
->tmp
.session_id_length
!= 0) &&
606 (s
->s2
->tmp
.session_id_length
!= SSL2_SSL_SESSION_ID_LENGTH
)) {
607 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
608 SSLerr(SSL_F_GET_CLIENT_HELLO
, SSL_R_BAD_SSL_SESSION_ID_LENGTH
);
612 if (s
->s2
->tmp
.session_id_length
== 0) {
613 if (!ssl_get_new_session(s
, 1)) {
614 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
618 i
= ssl_get_prev_session(s
, &(p
[s
->s2
->tmp
.cipher_spec_length
]),
619 s
->s2
->tmp
.session_id_length
, NULL
);
620 if (i
== 1) { /* previous session */
622 } else if (i
== -1) {
623 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
626 if (s
->cert
== NULL
) {
627 ssl2_return_error(s
, SSL2_PE_NO_CERTIFICATE
);
628 SSLerr(SSL_F_GET_CLIENT_HELLO
, SSL_R_NO_CERTIFICATE_SET
);
632 if (!ssl_get_new_session(s
, 1)) {
633 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
640 cs
= ssl_bytes_to_cipher_list(s
, p
, s
->s2
->tmp
.cipher_spec_length
,
641 &s
->session
->ciphers
);
645 cl
= SSL_get_ciphers(s
);
647 if (s
->options
& SSL_OP_CIPHER_SERVER_PREFERENCE
) {
648 prio
= sk_SSL_CIPHER_dup(cl
);
656 for (z
= 0; z
< sk_SSL_CIPHER_num(prio
); z
++) {
657 if (sk_SSL_CIPHER_find(allow
, sk_SSL_CIPHER_value(prio
, z
)) < 0) {
658 (void)sk_SSL_CIPHER_delete(prio
, z
);
662 if (s
->options
& SSL_OP_CIPHER_SERVER_PREFERENCE
) {
663 sk_SSL_CIPHER_free(s
->session
->ciphers
);
664 s
->session
->ciphers
= prio
;
667 * s->session->ciphers should now have a list of ciphers that are on
668 * both the client and server. This list is ordered by the order the
669 * client sent the ciphers or in the order of the server's preference
670 * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
673 p
+= s
->s2
->tmp
.cipher_spec_length
;
674 /* done cipher selection */
676 /* session id extracted already */
677 p
+= s
->s2
->tmp
.session_id_length
;
680 if (s
->s2
->challenge_length
> sizeof s
->s2
->challenge
) {
681 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
682 SSLerr(SSL_F_GET_CLIENT_HELLO
, ERR_R_INTERNAL_ERROR
);
685 memcpy(s
->s2
->challenge
, p
, (unsigned int)s
->s2
->challenge_length
);
688 SSLerr(SSL_F_GET_CLIENT_HELLO
, ERR_R_MALLOC_FAILURE
);
692 static int server_hello(SSL
*s
)
694 unsigned char *p
, *d
;
697 p
= (unsigned char *)s
->init_buf
->data
;
698 if (s
->state
== SSL2_ST_SEND_SERVER_HELLO_A
) {
700 *(p
++) = SSL2_MT_SERVER_HELLO
; /* type */
702 *(p
++) = (unsigned char)hit
;
705 if (s
->session
->sess_cert
!= NULL
)
707 * This can't really happen because get_client_hello has
708 * called ssl_get_new_session, which does not set sess_cert.
710 ssl_sess_cert_free(s
->session
->sess_cert
);
711 s
->session
->sess_cert
= ssl_sess_cert_new();
712 if (s
->session
->sess_cert
== NULL
) {
713 SSLerr(SSL_F_SERVER_HELLO
, ERR_R_MALLOC_FAILURE
);
718 * If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
719 * depending on whether it survived in the internal cache or was
720 * retrieved from an external cache. If it is NULL, we cannot put any
721 * useful data in it anyway, so we don't touch it.
724 # else /* That's what used to be done when cert_st
725 * and sess_cert_st were * the same. */
726 if (!hit
) { /* else add cert to session */
727 CRYPTO_add(&s
->cert
->references
, 1, CRYPTO_LOCK_SSL_CERT
);
728 if (s
->session
->sess_cert
!= NULL
)
729 ssl_cert_free(s
->session
->sess_cert
);
730 s
->session
->sess_cert
= s
->cert
;
731 } else { /* We have a session id-cache hit, if the *
732 * session-id has no certificate listed
733 * against * the 'cert' structure, grab the
734 * 'old' one * listed against the SSL
736 if (s
->session
->sess_cert
== NULL
) {
737 CRYPTO_add(&s
->cert
->references
, 1, CRYPTO_LOCK_SSL_CERT
);
738 s
->session
->sess_cert
= s
->cert
;
743 if (s
->cert
== NULL
) {
744 ssl2_return_error(s
, SSL2_PE_NO_CERTIFICATE
);
745 SSLerr(SSL_F_SERVER_HELLO
, SSL_R_NO_CERTIFICATE_SPECIFIED
);
750 *(p
++) = 0; /* no certificate type */
751 s2n(s
->version
, p
); /* version */
752 s2n(0, p
); /* cert len */
753 s2n(0, p
); /* ciphers len */
756 /* put certificate type */
757 *(p
++) = SSL2_CT_X509_CERTIFICATE
;
758 s2n(s
->version
, p
); /* version */
759 n
= i2d_X509(s
->cert
->pkeys
[SSL_PKEY_RSA_ENC
].x509
, NULL
);
760 s2n(n
, p
); /* certificate length */
761 i2d_X509(s
->cert
->pkeys
[SSL_PKEY_RSA_ENC
].x509
, &d
);
765 * lets send out the ciphers we like in the prefered order
767 n
= ssl_cipher_list_to_bytes(s
, s
->session
->ciphers
, d
, 0);
769 s2n(n
, p
); /* add cipher length */
772 /* make and send conn_id */
773 s2n(SSL2_CONNECTION_ID_LENGTH
, p
); /* add conn_id length */
774 s
->s2
->conn_id_length
= SSL2_CONNECTION_ID_LENGTH
;
775 if (RAND_pseudo_bytes(s
->s2
->conn_id
, (int)s
->s2
->conn_id_length
) <=
778 memcpy(d
, s
->s2
->conn_id
, SSL2_CONNECTION_ID_LENGTH
);
779 d
+= SSL2_CONNECTION_ID_LENGTH
;
781 s
->state
= SSL2_ST_SEND_SERVER_HELLO_B
;
782 s
->init_num
= d
- (unsigned char *)s
->init_buf
->data
;
785 /* SSL2_ST_SEND_SERVER_HELLO_B */
787 * If we are using TCP/IP, the performance is bad if we do 2 writes
788 * without a read between them. This occurs when Session-id reuse is
789 * used, so I will put in a buffering module
792 if (!ssl_init_wbio_buffer(s
, 1))
796 return (ssl2_do_write(s
));
799 static int get_client_finished(SSL
*s
)
805 p
= (unsigned char *)s
->init_buf
->data
;
806 if (s
->state
== SSL2_ST_GET_CLIENT_FINISHED_A
) {
807 i
= ssl2_read(s
, (char *)&(p
[s
->init_num
]), 1 - s
->init_num
);
808 if (i
< 1 - s
->init_num
)
809 return (ssl2_part_read(s
, SSL_F_GET_CLIENT_FINISHED
, i
));
812 if (*p
!= SSL2_MT_CLIENT_FINISHED
) {
813 if (*p
!= SSL2_MT_ERROR
) {
814 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
815 SSLerr(SSL_F_GET_CLIENT_FINISHED
,
816 SSL_R_READ_WRONG_PACKET_TYPE
);
818 SSLerr(SSL_F_GET_CLIENT_FINISHED
, SSL_R_PEER_ERROR
);
819 /* try to read the error message */
820 i
= ssl2_read(s
, (char *)&(p
[s
->init_num
]), 3 - s
->init_num
);
821 return ssl2_part_read(s
, SSL_F_GET_SERVER_VERIFY
, i
);
825 s
->state
= SSL2_ST_GET_CLIENT_FINISHED_B
;
828 /* SSL2_ST_GET_CLIENT_FINISHED_B */
829 if (s
->s2
->conn_id_length
> sizeof s
->s2
->conn_id
) {
830 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
831 SSLerr(SSL_F_GET_CLIENT_FINISHED
, ERR_R_INTERNAL_ERROR
);
834 len
= 1 + (unsigned long)s
->s2
->conn_id_length
;
835 n
= (int)len
- s
->init_num
;
836 i
= ssl2_read(s
, (char *)&(p
[s
->init_num
]), n
);
838 return (ssl2_part_read(s
, SSL_F_GET_CLIENT_FINISHED
, i
));
840 if (s
->msg_callback
) {
841 /* CLIENT-FINISHED */
842 s
->msg_callback(0, s
->version
, 0, p
, len
, s
, s
->msg_callback_arg
);
845 if (memcmp(p
, s
->s2
->conn_id
, s
->s2
->conn_id_length
) != 0) {
846 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
847 SSLerr(SSL_F_GET_CLIENT_FINISHED
, SSL_R_CONNECTION_ID_IS_DIFFERENT
);
853 static int server_verify(SSL
*s
)
857 if (s
->state
== SSL2_ST_SEND_SERVER_VERIFY_A
) {
858 p
= (unsigned char *)s
->init_buf
->data
;
859 *(p
++) = SSL2_MT_SERVER_VERIFY
;
860 if (s
->s2
->challenge_length
> sizeof s
->s2
->challenge
) {
861 SSLerr(SSL_F_SERVER_VERIFY
, ERR_R_INTERNAL_ERROR
);
864 memcpy(p
, s
->s2
->challenge
, (unsigned int)s
->s2
->challenge_length
);
865 /* p+=s->s2->challenge_length; */
867 s
->state
= SSL2_ST_SEND_SERVER_VERIFY_B
;
868 s
->init_num
= s
->s2
->challenge_length
+ 1;
871 return (ssl2_do_write(s
));
874 static int server_finish(SSL
*s
)
878 if (s
->state
== SSL2_ST_SEND_SERVER_FINISHED_A
) {
879 p
= (unsigned char *)s
->init_buf
->data
;
880 *(p
++) = SSL2_MT_SERVER_FINISHED
;
882 if (s
->session
->session_id_length
> sizeof s
->session
->session_id
) {
883 SSLerr(SSL_F_SERVER_FINISH
, ERR_R_INTERNAL_ERROR
);
886 memcpy(p
, s
->session
->session_id
,
887 (unsigned int)s
->session
->session_id_length
);
888 /* p+=s->session->session_id_length; */
890 s
->state
= SSL2_ST_SEND_SERVER_FINISHED_B
;
891 s
->init_num
= s
->session
->session_id_length
+ 1;
895 /* SSL2_ST_SEND_SERVER_FINISHED_B */
896 return (ssl2_do_write(s
));
899 /* send the request and check the response */
900 static int request_certificate(SSL
*s
)
902 const unsigned char *cp
;
903 unsigned char *p
, *p2
, *buf2
;
905 int i
, j
, ctype
, ret
= -1;
908 STACK_OF(X509
) *sk
= NULL
;
910 ccd
= s
->s2
->tmp
.ccl
;
911 if (s
->state
== SSL2_ST_SEND_REQUEST_CERTIFICATE_A
) {
912 p
= (unsigned char *)s
->init_buf
->data
;
913 *(p
++) = SSL2_MT_REQUEST_CERTIFICATE
;
914 *(p
++) = SSL2_AT_MD5_WITH_RSA_ENCRYPTION
;
915 if (RAND_pseudo_bytes(ccd
, SSL2_MIN_CERT_CHALLENGE_LENGTH
) <= 0)
917 memcpy(p
, ccd
, SSL2_MIN_CERT_CHALLENGE_LENGTH
);
919 s
->state
= SSL2_ST_SEND_REQUEST_CERTIFICATE_B
;
920 s
->init_num
= SSL2_MIN_CERT_CHALLENGE_LENGTH
+ 2;
924 if (s
->state
== SSL2_ST_SEND_REQUEST_CERTIFICATE_B
) {
925 i
= ssl2_do_write(s
);
932 s
->state
= SSL2_ST_SEND_REQUEST_CERTIFICATE_C
;
935 if (s
->state
== SSL2_ST_SEND_REQUEST_CERTIFICATE_C
) {
936 p
= (unsigned char *)s
->init_buf
->data
;
937 /* try to read 6 octets ... */
938 i
= ssl2_read(s
, (char *)&(p
[s
->init_num
]), 6 - s
->init_num
);
940 * ... but don't call ssl2_part_read now if we got at least 3
941 * (probably NO-CERTIFICATE-ERROR)
943 if (i
< 3 - s
->init_num
) {
944 ret
= ssl2_part_read(s
, SSL_F_REQUEST_CERTIFICATE
, i
);
949 if ((s
->init_num
>= 3) && (p
[0] == SSL2_MT_ERROR
)) {
951 if (i
!= SSL2_PE_NO_CERTIFICATE
) {
953 * not the error message we expected -- let ssl2_part_read
957 ret
= ssl2_part_read(s
, SSL_F_REQUEST_CERTIFICATE
, 3);
961 if (s
->msg_callback
) {
963 s
->msg_callback(0, s
->version
, 0, p
, 3, s
,
964 s
->msg_callback_arg
);
968 * this is the one place where we can recover from an SSL 2.0
972 if (s
->verify_mode
& SSL_VERIFY_FAIL_IF_NO_PEER_CERT
) {
973 ssl2_return_error(s
, SSL2_PE_BAD_CERTIFICATE
);
974 SSLerr(SSL_F_REQUEST_CERTIFICATE
,
975 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE
);
981 if ((*(p
++) != SSL2_MT_CLIENT_CERTIFICATE
) || (s
->init_num
< 6)) {
982 ssl2_return_error(s
, SSL2_PE_UNDEFINED_ERROR
);
983 SSLerr(SSL_F_REQUEST_CERTIFICATE
, SSL_R_SHORT_READ
);
986 if (s
->init_num
!= 6) {
987 SSLerr(SSL_F_REQUEST_CERTIFICATE
, ERR_R_INTERNAL_ERROR
);
991 /* ok we have a response */
992 /* certificate type, there is only one right now. */
994 if (ctype
!= SSL2_AT_MD5_WITH_RSA_ENCRYPTION
) {
995 ssl2_return_error(s
, SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE
);
996 SSLerr(SSL_F_REQUEST_CERTIFICATE
, SSL_R_BAD_RESPONSE_ARGUMENT
);
1000 s
->s2
->tmp
.clen
= i
;
1002 s
->s2
->tmp
.rlen
= i
;
1003 s
->state
= SSL2_ST_SEND_REQUEST_CERTIFICATE_D
;
1006 /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1007 p
= (unsigned char *)s
->init_buf
->data
;
1008 len
= 6 + (unsigned long)s
->s2
->tmp
.clen
+ (unsigned long)s
->s2
->tmp
.rlen
;
1009 if (len
> SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER
) {
1010 SSLerr(SSL_F_REQUEST_CERTIFICATE
, SSL_R_MESSAGE_TOO_LONG
);
1013 j
= (int)len
- s
->init_num
;
1014 i
= ssl2_read(s
, (char *)&(p
[s
->init_num
]), j
);
1016 ret
= ssl2_part_read(s
, SSL_F_REQUEST_CERTIFICATE
, i
);
1019 if (s
->msg_callback
) {
1020 /* CLIENT-CERTIFICATE */
1021 s
->msg_callback(0, s
->version
, 0, p
, len
, s
, s
->msg_callback_arg
);
1026 x509
= (X509
*)d2i_X509(NULL
, &cp
, (long)s
->s2
->tmp
.clen
);
1028 SSLerr(SSL_F_REQUEST_CERTIFICATE
, ERR_R_X509_LIB
);
1032 if (((sk
= sk_X509_new_null()) == NULL
) || (!sk_X509_push(sk
, x509
))) {
1033 SSLerr(SSL_F_REQUEST_CERTIFICATE
, ERR_R_MALLOC_FAILURE
);
1037 i
= ssl_verify_cert_chain(s
, sk
);
1039 if (i
> 0) { /* we like the packet, now check the chksum */
1041 EVP_PKEY
*pkey
= NULL
;
1043 EVP_MD_CTX_init(&ctx
);
1044 EVP_VerifyInit_ex(&ctx
, s
->ctx
->rsa_md5
, NULL
);
1045 EVP_VerifyUpdate(&ctx
, s
->s2
->key_material
,
1046 s
->s2
->key_material_length
);
1047 EVP_VerifyUpdate(&ctx
, ccd
, SSL2_MIN_CERT_CHALLENGE_LENGTH
);
1049 i
= i2d_X509(s
->cert
->pkeys
[SSL_PKEY_RSA_ENC
].x509
, NULL
);
1050 buf2
= OPENSSL_malloc((unsigned int)i
);
1052 SSLerr(SSL_F_REQUEST_CERTIFICATE
, ERR_R_MALLOC_FAILURE
);
1056 i
= i2d_X509(s
->cert
->pkeys
[SSL_PKEY_RSA_ENC
].x509
, &p2
);
1057 EVP_VerifyUpdate(&ctx
, buf2
, (unsigned int)i
);
1060 pkey
= X509_get_pubkey(x509
);
1063 i
= EVP_VerifyFinal(&ctx
, cp
, s
->s2
->tmp
.rlen
, pkey
);
1064 EVP_PKEY_free(pkey
);
1065 EVP_MD_CTX_cleanup(&ctx
);
1068 if (s
->session
->peer
!= NULL
)
1069 X509_free(s
->session
->peer
);
1070 s
->session
->peer
= x509
;
1071 CRYPTO_add(&x509
->references
, 1, CRYPTO_LOCK_X509
);
1072 s
->session
->verify_result
= s
->verify_result
;
1076 SSLerr(SSL_F_REQUEST_CERTIFICATE
, SSL_R_BAD_CHECKSUM
);
1081 ssl2_return_error(s
, SSL2_PE_BAD_CERTIFICATE
);
1089 static int ssl_rsa_private_decrypt(CERT
*c
, int len
, unsigned char *from
,
1090 unsigned char *to
, int padding
)
1095 if ((c
== NULL
) || (c
->pkeys
[SSL_PKEY_RSA_ENC
].privatekey
== NULL
)) {
1096 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT
, SSL_R_NO_PRIVATEKEY
);
1099 if (c
->pkeys
[SSL_PKEY_RSA_ENC
].privatekey
->type
!= EVP_PKEY_RSA
) {
1100 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT
, SSL_R_PUBLIC_KEY_IS_NOT_RSA
);
1103 rsa
= c
->pkeys
[SSL_PKEY_RSA_ENC
].privatekey
->pkey
.rsa
;
1105 /* we have the public key */
1106 i
= RSA_private_decrypt(len
, from
, to
, rsa
, padding
);
1108 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT
, ERR_R_RSA_LIB
);
1111 #else /* !OPENSSL_NO_SSL2 */
1114 static void *dummy
= &dummy
;