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;
380 p = (unsigned char *)s->init_buf->data;
381 if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A) {
382 i = ssl2_read(s, (char *)&(p[s->init_num]), 10 - s->init_num);
384 if (i < (10 - s->init_num))
385 return (ssl2_part_read(s, SSL_F_GET_CLIENT_MASTER_KEY, i));
388 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY) {
389 if (p[-1] != SSL2_MT_ERROR) {
390 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
391 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
392 SSL_R_READ_WRONG_PACKET_TYPE);
394 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
398 cp = ssl2_get_cipher_by_char(p);
399 if (cp == NULL || sk_SSL_CIPHER_find(s->session->ciphers, cp) < 0) {
400 ssl2_return_error(s, SSL2_PE_NO_CIPHER);
401 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
404 s->session->cipher = cp;
408 s->s2->tmp.clear = i;
412 if (i > SSL_MAX_KEY_ARG_LENGTH) {
413 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
414 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
417 s->session->key_arg_length = i;
418 s->state = SSL2_ST_GET_CLIENT_MASTER_KEY_B;
421 /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
422 p = (unsigned char *)s->init_buf->data;
423 if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
424 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
425 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
428 keya = s->session->key_arg_length;
430 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc +
432 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
433 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
434 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_MESSAGE_TOO_LONG);
437 n = (int)len - s->init_num;
438 i = ssl2_read(s, (char *)&(p[s->init_num]), n);
440 return (ssl2_part_read(s, SSL_F_GET_CLIENT_MASTER_KEY, i));
441 if (s->msg_callback) {
442 /* CLIENT-MASTER-KEY */
443 s->msg_callback(0, s->version, 0, p, (size_t)len, s,
444 s->msg_callback_arg);
448 memcpy(s->session->key_arg, &(p[s->s2->tmp.clear + s->s2->tmp.enc]),
451 if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL) {
452 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
453 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_PRIVATEKEY);
457 is_export = SSL_C_IS_EXPORT(s->session->cipher);
459 if (!ssl_cipher_get_evp(s->session, &c, &md, NULL)) {
460 ssl2_return_error(s, SSL2_PE_NO_CIPHER);
461 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
462 SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
466 if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC) {
473 * The format of the CLIENT-MASTER-KEY message is
474 * 1 byte message type
476 * 2-byte clear key length (stored in s->s2->tmp.clear)
477 * 2-byte encrypted key length (stored in s->s2->tmp.enc)
478 * 2-byte key args length (IV etc)
483 * If the cipher is an export cipher, then the encrypted key bytes
484 * are a fixed portion of the total key (5 or 8 bytes). The size of
485 * this portion is in |ek|. If the cipher is not an export cipher,
486 * then the entire key material is encrypted (i.e., clear key length
489 if ((!is_export && s->s2->tmp.clear != 0) ||
490 (is_export && s->s2->tmp.clear + ek != (unsigned int)EVP_CIPHER_key_length(c))) {
491 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
492 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_LENGTH);
496 * The encrypted blob must decrypt to the encrypted portion of the key.
497 * Decryption can't be expanding, so if we don't have enough encrypted
498 * bytes to fit the key in the buffer, stop now.
500 if ((is_export && s->s2->tmp.enc < ek) ||
501 (!is_export && s->s2->tmp.enc < (unsigned int)EVP_CIPHER_key_length(c))) {
502 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
503 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_LENGTH_TOO_SHORT);
507 i = ssl_rsa_private_decrypt(s->cert, s->s2->tmp.enc,
508 &(p[s->s2->tmp.clear]),
509 &(p[s->s2->tmp.clear]),
510 (s->s2->ssl2_rollback) ? RSA_SSLV23_PADDING :
516 * If a bad decrypt, continue with protocol but with a random master
517 * secret (Bleichenbacher attack)
519 if ((i < 0) || ((!is_export && i != EVP_CIPHER_key_length(c))
520 || (is_export && i != (int)ek))) {
525 i = EVP_CIPHER_key_length(c);
526 if (RAND_pseudo_bytes(&p[s->s2->tmp.clear], i) <= 0)
532 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_BAD_RSA_DECRYPT);
534 /* incorrect number of key bytes for non export cipher */
535 else if ((!is_export && (i != EVP_CIPHER_key_length(c)))
536 || (is_export && ((i != ek) || (s->s2->tmp.clear + i !=
537 EVP_CIPHER_key_length(c))))) {
539 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_WRONG_NUMBER_OF_KEY_BITS);
542 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
548 i = EVP_CIPHER_key_length(c);
550 if (i > SSL_MAX_MASTER_KEY_LENGTH) {
551 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
552 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
555 s->session->master_key_length = i;
556 memcpy(s->session->master_key, p, (unsigned int)i);
560 static int get_client_hello(SSL *s)
565 STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
566 STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
567 STACK_OF(SSL_CIPHER) *prio, *allow;
571 * This is a bit of a hack to check for the correct packet type the first
574 if (s->state == SSL2_ST_GET_CLIENT_HELLO_A) {
576 s->state = SSL2_ST_GET_CLIENT_HELLO_B;
579 p = (unsigned char *)s->init_buf->data;
580 if (s->state == SSL2_ST_GET_CLIENT_HELLO_B) {
581 i = ssl2_read(s, (char *)&(p[s->init_num]), 9 - s->init_num);
582 if (i < (9 - s->init_num))
583 return (ssl2_part_read(s, SSL_F_GET_CLIENT_HELLO, i));
586 if (*(p++) != SSL2_MT_CLIENT_HELLO) {
587 if (p[-1] != SSL2_MT_ERROR) {
588 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
589 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_READ_WRONG_PACKET_TYPE);
591 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_PEER_ERROR);
598 s->s2->tmp.cipher_spec_length = i;
600 s->s2->tmp.session_id_length = i;
602 s->s2->challenge_length = i;
603 if ((i < SSL2_MIN_CHALLENGE_LENGTH) ||
604 (i > SSL2_MAX_CHALLENGE_LENGTH)) {
605 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
606 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_INVALID_CHALLENGE_LENGTH);
609 s->state = SSL2_ST_GET_CLIENT_HELLO_C;
612 /* SSL2_ST_GET_CLIENT_HELLO_C */
613 p = (unsigned char *)s->init_buf->data;
615 9 + (unsigned long)s->s2->tmp.cipher_spec_length +
616 (unsigned long)s->s2->challenge_length +
617 (unsigned long)s->s2->tmp.session_id_length;
618 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
619 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
620 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_MESSAGE_TOO_LONG);
623 n = (int)len - s->init_num;
624 i = ssl2_read(s, (char *)&(p[s->init_num]), n);
626 return (ssl2_part_read(s, SSL_F_GET_CLIENT_HELLO, i));
627 if (s->msg_callback) {
629 s->msg_callback(0, s->version, 0, p, (size_t)len, s,
630 s->msg_callback_arg);
635 * get session-id before cipher stuff so we can get out session structure
639 if ((s->s2->tmp.session_id_length != 0) &&
640 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH)) {
641 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
642 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_BAD_SSL_SESSION_ID_LENGTH);
646 if (s->s2->tmp.session_id_length == 0) {
647 if (!ssl_get_new_session(s, 1)) {
648 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
652 i = ssl_get_prev_session(s, &(p[s->s2->tmp.cipher_spec_length]),
653 s->s2->tmp.session_id_length, NULL);
654 if (i == 1) { /* previous session */
656 } else if (i == -1) {
657 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
660 if (s->cert == NULL) {
661 ssl2_return_error(s, SSL2_PE_NO_CERTIFICATE);
662 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_NO_CERTIFICATE_SET);
666 if (!ssl_get_new_session(s, 1)) {
667 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
674 cs = ssl_bytes_to_cipher_list(s, p, s->s2->tmp.cipher_spec_length,
675 &s->session->ciphers);
679 cl = SSL_get_ciphers(s);
681 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
682 prio = sk_SSL_CIPHER_dup(cl);
691 /* Generate list of SSLv2 ciphers shared between client and server */
692 for (z = 0; z < sk_SSL_CIPHER_num(prio); z++) {
693 const SSL_CIPHER *cp = sk_SSL_CIPHER_value(prio, z);
694 if ((cp->algorithms & SSL_SSLV2) == 0 ||
695 sk_SSL_CIPHER_find(allow, cp) < 0) {
696 (void)sk_SSL_CIPHER_delete(prio, z);
700 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
701 sk_SSL_CIPHER_free(s->session->ciphers);
702 s->session->ciphers = prio;
705 /* Make sure we have at least one cipher in common */
706 if (sk_SSL_CIPHER_num(s->session->ciphers) == 0) {
707 ssl2_return_error(s, SSL2_PE_NO_CIPHER);
708 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_NO_CIPHER_MATCH);
712 * s->session->ciphers should now have a list of ciphers that are on
713 * both the client and server. This list is ordered by the order the
714 * client sent the ciphers or in the order of the server's preference
715 * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
718 p += s->s2->tmp.cipher_spec_length;
719 /* done cipher selection */
721 /* session id extracted already */
722 p += s->s2->tmp.session_id_length;
725 if (s->s2->challenge_length > sizeof s->s2->challenge) {
726 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
727 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
730 memcpy(s->s2->challenge, p, (unsigned int)s->s2->challenge_length);
733 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_MALLOC_FAILURE);
737 static int server_hello(SSL *s)
739 unsigned char *p, *d;
742 p = (unsigned char *)s->init_buf->data;
743 if (s->state == SSL2_ST_SEND_SERVER_HELLO_A) {
745 *(p++) = SSL2_MT_SERVER_HELLO; /* type */
747 *(p++) = (unsigned char)hit;
750 if (s->session->sess_cert != NULL)
752 * This can't really happen because get_client_hello has
753 * called ssl_get_new_session, which does not set sess_cert.
755 ssl_sess_cert_free(s->session->sess_cert);
756 s->session->sess_cert = ssl_sess_cert_new();
757 if (s->session->sess_cert == NULL) {
758 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
763 * If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
764 * depending on whether it survived in the internal cache or was
765 * retrieved from an external cache. If it is NULL, we cannot put any
766 * useful data in it anyway, so we don't touch it.
769 # else /* That's what used to be done when cert_st
770 * and sess_cert_st were * the same. */
771 if (!hit) { /* else add cert to session */
772 CRYPTO_add(&s->cert->references, 1, CRYPTO_LOCK_SSL_CERT);
773 if (s->session->sess_cert != NULL)
774 ssl_cert_free(s->session->sess_cert);
775 s->session->sess_cert = s->cert;
776 } else { /* We have a session id-cache hit, if the *
777 * session-id has no certificate listed
778 * against * the 'cert' structure, grab the
779 * 'old' one * listed against the SSL
781 if (s->session->sess_cert == NULL) {
782 CRYPTO_add(&s->cert->references, 1, CRYPTO_LOCK_SSL_CERT);
783 s->session->sess_cert = s->cert;
788 if (s->cert == NULL) {
789 ssl2_return_error(s, SSL2_PE_NO_CERTIFICATE);
790 SSLerr(SSL_F_SERVER_HELLO, SSL_R_NO_CERTIFICATE_SPECIFIED);
795 *(p++) = 0; /* no certificate type */
796 s2n(s->version, p); /* version */
797 s2n(0, p); /* cert len */
798 s2n(0, p); /* ciphers len */
801 /* put certificate type */
802 *(p++) = SSL2_CT_X509_CERTIFICATE;
803 s2n(s->version, p); /* version */
804 n = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL);
805 s2n(n, p); /* certificate length */
806 i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, &d);
810 * lets send out the ciphers we like in the prefered order
812 n = ssl_cipher_list_to_bytes(s, s->session->ciphers, d, 0);
814 s2n(n, p); /* add cipher length */
817 /* make and send conn_id */
818 s2n(SSL2_CONNECTION_ID_LENGTH, p); /* add conn_id length */
819 s->s2->conn_id_length = SSL2_CONNECTION_ID_LENGTH;
820 if (RAND_pseudo_bytes(s->s2->conn_id, (int)s->s2->conn_id_length) <=
823 memcpy(d, s->s2->conn_id, SSL2_CONNECTION_ID_LENGTH);
824 d += SSL2_CONNECTION_ID_LENGTH;
826 s->state = SSL2_ST_SEND_SERVER_HELLO_B;
827 s->init_num = d - (unsigned char *)s->init_buf->data;
830 /* SSL2_ST_SEND_SERVER_HELLO_B */
832 * If we are using TCP/IP, the performance is bad if we do 2 writes
833 * without a read between them. This occurs when Session-id reuse is
834 * used, so I will put in a buffering module
837 if (!ssl_init_wbio_buffer(s, 1))
841 return (ssl2_do_write(s));
844 static int get_client_finished(SSL *s)
850 p = (unsigned char *)s->init_buf->data;
851 if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A) {
852 i = ssl2_read(s, (char *)&(p[s->init_num]), 1 - s->init_num);
853 if (i < 1 - s->init_num)
854 return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i));
857 if (*p != SSL2_MT_CLIENT_FINISHED) {
858 if (*p != SSL2_MT_ERROR) {
859 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
860 SSLerr(SSL_F_GET_CLIENT_FINISHED,
861 SSL_R_READ_WRONG_PACKET_TYPE);
863 SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_PEER_ERROR);
864 /* try to read the error message */
865 i = ssl2_read(s, (char *)&(p[s->init_num]), 3 - s->init_num);
866 return ssl2_part_read(s, SSL_F_GET_SERVER_VERIFY, i);
870 s->state = SSL2_ST_GET_CLIENT_FINISHED_B;
873 /* SSL2_ST_GET_CLIENT_FINISHED_B */
874 if (s->s2->conn_id_length > sizeof s->s2->conn_id) {
875 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
876 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
879 len = 1 + (unsigned long)s->s2->conn_id_length;
880 n = (int)len - s->init_num;
881 i = ssl2_read(s, (char *)&(p[s->init_num]), n);
883 return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i));
885 if (s->msg_callback) {
886 /* CLIENT-FINISHED */
887 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg);
890 if (memcmp(p, s->s2->conn_id, s->s2->conn_id_length) != 0) {
891 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
892 SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_CONNECTION_ID_IS_DIFFERENT);
898 static int server_verify(SSL *s)
902 if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A) {
903 p = (unsigned char *)s->init_buf->data;
904 *(p++) = SSL2_MT_SERVER_VERIFY;
905 if (s->s2->challenge_length > sizeof s->s2->challenge) {
906 SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
909 memcpy(p, s->s2->challenge, (unsigned int)s->s2->challenge_length);
910 /* p+=s->s2->challenge_length; */
912 s->state = SSL2_ST_SEND_SERVER_VERIFY_B;
913 s->init_num = s->s2->challenge_length + 1;
916 return (ssl2_do_write(s));
919 static int server_finish(SSL *s)
923 if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A) {
924 p = (unsigned char *)s->init_buf->data;
925 *(p++) = SSL2_MT_SERVER_FINISHED;
927 if (s->session->session_id_length > sizeof s->session->session_id) {
928 SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
931 memcpy(p, s->session->session_id,
932 (unsigned int)s->session->session_id_length);
933 /* p+=s->session->session_id_length; */
935 s->state = SSL2_ST_SEND_SERVER_FINISHED_B;
936 s->init_num = s->session->session_id_length + 1;
940 /* SSL2_ST_SEND_SERVER_FINISHED_B */
941 return (ssl2_do_write(s));
944 /* send the request and check the response */
945 static int request_certificate(SSL *s)
947 const unsigned char *cp;
948 unsigned char *p, *p2, *buf2;
950 int i, j, ctype, ret = -1;
953 STACK_OF(X509) *sk = NULL;
955 ccd = s->s2->tmp.ccl;
956 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A) {
957 p = (unsigned char *)s->init_buf->data;
958 *(p++) = SSL2_MT_REQUEST_CERTIFICATE;
959 *(p++) = SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
960 if (RAND_pseudo_bytes(ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
962 memcpy(p, ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH);
964 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
965 s->init_num = SSL2_MIN_CERT_CHALLENGE_LENGTH + 2;
969 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B) {
970 i = ssl2_do_write(s);
977 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
980 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C) {
981 p = (unsigned char *)s->init_buf->data;
982 /* try to read 6 octets ... */
983 i = ssl2_read(s, (char *)&(p[s->init_num]), 6 - s->init_num);
985 * ... but don't call ssl2_part_read now if we got at least 3
986 * (probably NO-CERTIFICATE-ERROR)
988 if (i < 3 - s->init_num) {
989 ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i);
994 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR)) {
996 if (i != SSL2_PE_NO_CERTIFICATE) {
998 * not the error message we expected -- let ssl2_part_read
1002 ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, 3);
1006 if (s->msg_callback) {
1008 s->msg_callback(0, s->version, 0, p, 3, s,
1009 s->msg_callback_arg);
1013 * this is the one place where we can recover from an SSL 2.0
1017 if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
1018 ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE);
1019 SSLerr(SSL_F_REQUEST_CERTIFICATE,
1020 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1026 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6)) {
1027 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
1028 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_SHORT_READ);
1031 if (s->init_num != 6) {
1032 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1036 /* ok we have a response */
1037 /* certificate type, there is only one right now. */
1039 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION) {
1040 ssl2_return_error(s, SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1041 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_RESPONSE_ARGUMENT);
1045 s->s2->tmp.clen = i;
1047 s->s2->tmp.rlen = i;
1048 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1051 /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1052 p = (unsigned char *)s->init_buf->data;
1053 len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1054 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
1055 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_MESSAGE_TOO_LONG);
1058 j = (int)len - s->init_num;
1059 i = ssl2_read(s, (char *)&(p[s->init_num]), j);
1061 ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i);
1064 if (s->msg_callback) {
1065 /* CLIENT-CERTIFICATE */
1066 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg);
1071 x509 = (X509 *)d2i_X509(NULL, &cp, (long)s->s2->tmp.clen);
1073 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_X509_LIB);
1077 if (((sk = sk_X509_new_null()) == NULL) || (!sk_X509_push(sk, x509))) {
1078 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1082 i = ssl_verify_cert_chain(s, sk);
1084 if (i > 0) { /* we like the packet, now check the chksum */
1086 EVP_PKEY *pkey = NULL;
1088 EVP_MD_CTX_init(&ctx);
1089 EVP_VerifyInit_ex(&ctx, s->ctx->rsa_md5, NULL);
1090 EVP_VerifyUpdate(&ctx, s->s2->key_material,
1091 s->s2->key_material_length);
1092 EVP_VerifyUpdate(&ctx, ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH);
1094 i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL);
1095 buf2 = OPENSSL_malloc((unsigned int)i);
1097 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1101 i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, &p2);
1102 EVP_VerifyUpdate(&ctx, buf2, (unsigned int)i);
1105 pkey = X509_get_pubkey(x509);
1108 i = EVP_VerifyFinal(&ctx, cp, s->s2->tmp.rlen, pkey);
1109 EVP_PKEY_free(pkey);
1110 EVP_MD_CTX_cleanup(&ctx);
1113 if (s->session->peer != NULL)
1114 X509_free(s->session->peer);
1115 s->session->peer = x509;
1116 CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
1117 s->session->verify_result = s->verify_result;
1121 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_CHECKSUM);
1126 ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE);
1134 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1135 unsigned char *to, int padding)
1140 if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)) {
1141 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_NO_PRIVATEKEY);
1144 if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA) {
1145 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1148 rsa = c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1150 /* we have the public key */
1151 i = RSA_private_decrypt(len, from, to, rsa, padding);
1153 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, ERR_R_RSA_LIB);
1156 #else /* !OPENSSL_NO_SSL2 */
1159 static void *dummy = &dummy;