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
114 #include "../crypto/constant_time_locl.h"
116 # include <openssl/bio.h>
117 # include <openssl/rand.h>
118 # include <openssl/objects.h>
119 # include <openssl/evp.h>
121 static const SSL_METHOD *ssl2_get_server_method(int ver);
122 static int get_client_master_key(SSL *s);
123 static int get_client_hello(SSL *s);
124 static int server_hello(SSL *s);
125 static int get_client_finished(SSL *s);
126 static int server_verify(SSL *s);
127 static int server_finish(SSL *s);
128 static int request_certificate(SSL *s);
129 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
130 unsigned char *to, int padding);
133 static const SSL_METHOD *ssl2_get_server_method(int ver)
135 if (ver == SSL2_VERSION)
136 return (SSLv2_server_method());
141 IMPLEMENT_ssl2_meth_func(SSLv2_server_method,
143 ssl_undefined_function, ssl2_get_server_method)
145 int ssl2_accept(SSL *s)
147 unsigned long l = (unsigned long)time(NULL);
151 void (*cb) (const SSL *ssl, int type, int val) = NULL;
152 int new_state, state;
154 RAND_add(&l, sizeof(l), 0);
158 if (s->info_callback != NULL)
159 cb = s->info_callback;
160 else if (s->ctx->info_callback != NULL)
161 cb = s->ctx->info_callback;
163 /* init things to blank */
165 if (!SSL_in_init(s) || SSL_in_before(s))
168 if (s->cert == NULL) {
169 SSLerr(SSL_F_SSL2_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
180 case SSL_ST_BEFORE | SSL_ST_ACCEPT:
181 case SSL_ST_OK | SSL_ST_ACCEPT:
185 cb(s, SSL_CB_HANDSHAKE_START, 1);
187 s->version = SSL2_VERSION;
188 s->type = SSL_ST_ACCEPT;
190 if (s->init_buf == NULL) {
191 if ((buf = BUF_MEM_new()) == NULL) {
196 (buf, (int)SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) {
204 s->ctx->stats.sess_accept++;
205 s->handshake_func = ssl2_accept;
206 s->state = SSL2_ST_GET_CLIENT_HELLO_A;
209 case SSL2_ST_GET_CLIENT_HELLO_A:
210 case SSL2_ST_GET_CLIENT_HELLO_B:
211 case SSL2_ST_GET_CLIENT_HELLO_C:
213 ret = get_client_hello(s);
217 s->state = SSL2_ST_SEND_SERVER_HELLO_A;
220 case SSL2_ST_SEND_SERVER_HELLO_A:
221 case SSL2_ST_SEND_SERVER_HELLO_B:
222 ret = server_hello(s);
227 s->state = SSL2_ST_GET_CLIENT_MASTER_KEY_A;
230 s->state = SSL2_ST_SERVER_START_ENCRYPTION;
233 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
234 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
235 ret = get_client_master_key(s);
239 s->state = SSL2_ST_SERVER_START_ENCRYPTION;
242 case SSL2_ST_SERVER_START_ENCRYPTION:
244 * Ok we how have sent all the stuff needed to start encrypting,
245 * the next packet back will be encrypted.
247 if (!ssl2_enc_init(s, 0)) {
251 s->s2->clear_text = 0;
252 s->state = SSL2_ST_SEND_SERVER_VERIFY_A;
255 case SSL2_ST_SEND_SERVER_VERIFY_A:
256 case SSL2_ST_SEND_SERVER_VERIFY_B:
257 ret = server_verify(s);
263 * If we are in here, we have been buffering the output, so
264 * we need to flush it and remove buffering from future
267 s->state = SSL2_ST_SEND_SERVER_VERIFY_C;
270 s->state = SSL2_ST_GET_CLIENT_FINISHED_A;
274 case SSL2_ST_SEND_SERVER_VERIFY_C:
275 /* get the number of bytes to write */
276 num1 = BIO_ctrl(s->wbio, BIO_CTRL_INFO, 0, NULL);
278 s->rwstate = SSL_WRITING;
279 num1 = BIO_flush(s->wbio);
284 s->rwstate = SSL_NOTHING;
287 /* flushed and now remove buffering */
288 s->wbio = BIO_pop(s->wbio);
290 s->state = SSL2_ST_GET_CLIENT_FINISHED_A;
293 case SSL2_ST_GET_CLIENT_FINISHED_A:
294 case SSL2_ST_GET_CLIENT_FINISHED_B:
295 ret = get_client_finished(s);
299 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
302 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
303 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
304 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
305 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
307 * don't do a 'request certificate' if we don't want to, or we
308 * already have one, and we only want to do it once.
310 if (!(s->verify_mode & SSL_VERIFY_PEER) ||
311 ((s->session->peer != NULL) &&
312 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE))) {
313 s->state = SSL2_ST_SEND_SERVER_FINISHED_A;
316 ret = request_certificate(s);
320 s->state = SSL2_ST_SEND_SERVER_FINISHED_A;
324 case SSL2_ST_SEND_SERVER_FINISHED_A:
325 case SSL2_ST_SEND_SERVER_FINISHED_B:
326 ret = server_finish(s);
330 s->state = SSL_ST_OK;
334 BUF_MEM_free(s->init_buf);
335 ssl_free_wbio_buffer(s);
338 /* ERR_clear_error(); */
340 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
342 s->ctx->stats.sess_accept_good++;
347 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
353 SSLerr(SSL_F_SSL2_ACCEPT, SSL_R_UNKNOWN_STATE);
359 if ((cb != NULL) && (s->state != state)) {
360 new_state = s->state;
362 cb(s, SSL_CB_ACCEPT_LOOP, 1);
363 s->state = new_state;
369 cb(s, SSL_CB_ACCEPT_EXIT, ret);
373 static int get_client_master_key(SSL *s)
375 int is_export, i, n, keya;
376 unsigned int num_encrypted_key_bytes, key_length;
379 const SSL_CIPHER *cp;
382 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
383 unsigned char decrypt_good;
386 p = (unsigned char *)s->init_buf->data;
387 if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A) {
388 i = ssl2_read(s, (char *)&(p[s->init_num]), 10 - s->init_num);
390 if (i < (10 - s->init_num))
391 return (ssl2_part_read(s, SSL_F_GET_CLIENT_MASTER_KEY, i));
394 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY) {
395 if (p[-1] != SSL2_MT_ERROR) {
396 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
397 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
398 SSL_R_READ_WRONG_PACKET_TYPE);
400 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
404 cp = ssl2_get_cipher_by_char(p);
406 ssl2_return_error(s, SSL2_PE_NO_CIPHER);
407 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
410 s->session->cipher = cp;
414 s->s2->tmp.clear = i;
418 if (i > SSL_MAX_KEY_ARG_LENGTH) {
419 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
420 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
423 s->session->key_arg_length = i;
424 s->state = SSL2_ST_GET_CLIENT_MASTER_KEY_B;
427 /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
428 p = (unsigned char *)s->init_buf->data;
429 if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
430 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
431 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
434 keya = s->session->key_arg_length;
436 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc +
438 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
439 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
440 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_MESSAGE_TOO_LONG);
443 n = (int)len - s->init_num;
444 i = ssl2_read(s, (char *)&(p[s->init_num]), n);
446 return (ssl2_part_read(s, SSL_F_GET_CLIENT_MASTER_KEY, i));
447 if (s->msg_callback) {
448 /* CLIENT-MASTER-KEY */
449 s->msg_callback(0, s->version, 0, p, (size_t)len, s,
450 s->msg_callback_arg);
454 memcpy(s->session->key_arg, &(p[s->s2->tmp.clear + s->s2->tmp.enc]),
457 if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL) {
458 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
459 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_PRIVATEKEY);
463 is_export = SSL_C_IS_EXPORT(s->session->cipher);
465 if (!ssl_cipher_get_evp(s->session, &c, &md, NULL, NULL, NULL)) {
466 ssl2_return_error(s, SSL2_PE_NO_CIPHER);
467 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
468 SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
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 |num_encrypted_key_bytes|. If the cipher is not an
486 * export cipher, then the entire key material is encrypted (i.e., clear
487 * key length must be zero).
489 key_length = (unsigned int)EVP_CIPHER_key_length(c);
490 if (key_length > SSL_MAX_MASTER_KEY_LENGTH) {
491 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
492 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
496 if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC) {
498 num_encrypted_key_bytes = 8;
499 } else if (is_export) {
500 num_encrypted_key_bytes = 5;
502 num_encrypted_key_bytes = key_length;
505 if (s->s2->tmp.clear + num_encrypted_key_bytes != key_length) {
506 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
507 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_LENGTH);
511 * The encrypted blob must decrypt to the encrypted portion of the key.
512 * Decryption can't be expanding, so if we don't have enough encrypted
513 * bytes to fit the key in the buffer, stop now.
515 if (s->s2->tmp.enc < num_encrypted_key_bytes) {
516 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
517 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_LENGTH_TOO_SHORT);
522 * We must not leak whether a decryption failure occurs because of
523 * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246,
524 * section 7.4.7.1). The code follows that advice of the TLS RFC and
525 * generates a random premaster secret for the case that the decrypt
526 * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1
530 * should be RAND_bytes, but we cannot work around a failure.
532 if (RAND_pseudo_bytes(rand_premaster_secret,
533 (int)num_encrypted_key_bytes) <= 0)
536 i = ssl_rsa_private_decrypt(s->cert, s->s2->tmp.enc,
537 &(p[s->s2->tmp.clear]),
538 &(p[s->s2->tmp.clear]),
539 (s->s2->ssl2_rollback) ? RSA_SSLV23_PADDING :
543 * If a bad decrypt, continue with protocol but with a random master
544 * secret (Bleichenbacher attack)
546 decrypt_good = constant_time_eq_int_8(i, (int)num_encrypted_key_bytes);
547 for (j = 0; j < num_encrypted_key_bytes; j++) {
548 p[s->s2->tmp.clear + j] =
549 constant_time_select_8(decrypt_good, p[s->s2->tmp.clear + j],
550 rand_premaster_secret[j]);
553 s->session->master_key_length = (int)key_length;
554 memcpy(s->session->master_key, p, key_length);
555 OPENSSL_cleanse(p, key_length);
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);
690 for (z = 0; z < sk_SSL_CIPHER_num(prio); z++) {
691 if (sk_SSL_CIPHER_find(allow, sk_SSL_CIPHER_value(prio, z)) < 0) {
692 (void)sk_SSL_CIPHER_delete(prio, z);
696 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
697 sk_SSL_CIPHER_free(s->session->ciphers);
698 s->session->ciphers = prio;
701 * s->session->ciphers should now have a list of ciphers that are on
702 * both the client and server. This list is ordered by the order the
703 * client sent the ciphers or in the order of the server's preference
704 * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
707 p += s->s2->tmp.cipher_spec_length;
708 /* done cipher selection */
710 /* session id extracted already */
711 p += s->s2->tmp.session_id_length;
714 if (s->s2->challenge_length > sizeof s->s2->challenge) {
715 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
716 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
719 memcpy(s->s2->challenge, p, (unsigned int)s->s2->challenge_length);
722 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_MALLOC_FAILURE);
726 static int server_hello(SSL *s)
728 unsigned char *p, *d;
731 p = (unsigned char *)s->init_buf->data;
732 if (s->state == SSL2_ST_SEND_SERVER_HELLO_A) {
734 *(p++) = SSL2_MT_SERVER_HELLO; /* type */
736 *(p++) = (unsigned char)hit;
739 if (s->session->sess_cert != NULL)
741 * This can't really happen because get_client_hello has
742 * called ssl_get_new_session, which does not set sess_cert.
744 ssl_sess_cert_free(s->session->sess_cert);
745 s->session->sess_cert = ssl_sess_cert_new();
746 if (s->session->sess_cert == NULL) {
747 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
752 * If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
753 * depending on whether it survived in the internal cache or was
754 * retrieved from an external cache. If it is NULL, we cannot put any
755 * useful data in it anyway, so we don't touch it.
758 # else /* That's what used to be done when cert_st
759 * and sess_cert_st were * the same. */
760 if (!hit) { /* else add cert to session */
761 CRYPTO_add(&s->cert->references, 1, CRYPTO_LOCK_SSL_CERT);
762 if (s->session->sess_cert != NULL)
763 ssl_cert_free(s->session->sess_cert);
764 s->session->sess_cert = s->cert;
765 } else { /* We have a session id-cache hit, if the *
766 * session-id has no certificate listed
767 * against * the 'cert' structure, grab the
768 * 'old' one * listed against the SSL
770 if (s->session->sess_cert == NULL) {
771 CRYPTO_add(&s->cert->references, 1, CRYPTO_LOCK_SSL_CERT);
772 s->session->sess_cert = s->cert;
777 if (s->cert == NULL) {
778 ssl2_return_error(s, SSL2_PE_NO_CERTIFICATE);
779 SSLerr(SSL_F_SERVER_HELLO, SSL_R_NO_CERTIFICATE_SPECIFIED);
784 *(p++) = 0; /* no certificate type */
785 s2n(s->version, p); /* version */
786 s2n(0, p); /* cert len */
787 s2n(0, p); /* ciphers len */
790 /* put certificate type */
791 *(p++) = SSL2_CT_X509_CERTIFICATE;
792 s2n(s->version, p); /* version */
793 n = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL);
794 s2n(n, p); /* certificate length */
795 i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, &d);
799 * lets send out the ciphers we like in the prefered order
801 n = ssl_cipher_list_to_bytes(s, s->session->ciphers, d, 0);
803 s2n(n, p); /* add cipher length */
806 /* make and send conn_id */
807 s2n(SSL2_CONNECTION_ID_LENGTH, p); /* add conn_id length */
808 s->s2->conn_id_length = SSL2_CONNECTION_ID_LENGTH;
809 if (RAND_pseudo_bytes(s->s2->conn_id, (int)s->s2->conn_id_length) <=
812 memcpy(d, s->s2->conn_id, SSL2_CONNECTION_ID_LENGTH);
813 d += SSL2_CONNECTION_ID_LENGTH;
815 s->state = SSL2_ST_SEND_SERVER_HELLO_B;
816 s->init_num = d - (unsigned char *)s->init_buf->data;
819 /* SSL2_ST_SEND_SERVER_HELLO_B */
821 * If we are using TCP/IP, the performance is bad if we do 2 writes
822 * without a read between them. This occurs when Session-id reuse is
823 * used, so I will put in a buffering module
826 if (!ssl_init_wbio_buffer(s, 1))
830 return (ssl2_do_write(s));
833 static int get_client_finished(SSL *s)
839 p = (unsigned char *)s->init_buf->data;
840 if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A) {
841 i = ssl2_read(s, (char *)&(p[s->init_num]), 1 - s->init_num);
842 if (i < 1 - s->init_num)
843 return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i));
846 if (*p != SSL2_MT_CLIENT_FINISHED) {
847 if (*p != SSL2_MT_ERROR) {
848 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
849 SSLerr(SSL_F_GET_CLIENT_FINISHED,
850 SSL_R_READ_WRONG_PACKET_TYPE);
852 SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_PEER_ERROR);
853 /* try to read the error message */
854 i = ssl2_read(s, (char *)&(p[s->init_num]), 3 - s->init_num);
855 return ssl2_part_read(s, SSL_F_GET_SERVER_VERIFY, i);
859 s->state = SSL2_ST_GET_CLIENT_FINISHED_B;
862 /* SSL2_ST_GET_CLIENT_FINISHED_B */
863 if (s->s2->conn_id_length > sizeof s->s2->conn_id) {
864 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
865 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
868 len = 1 + (unsigned long)s->s2->conn_id_length;
869 n = (int)len - s->init_num;
870 i = ssl2_read(s, (char *)&(p[s->init_num]), n);
872 return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i));
874 if (s->msg_callback) {
875 /* CLIENT-FINISHED */
876 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg);
879 if (memcmp(p, s->s2->conn_id, s->s2->conn_id_length) != 0) {
880 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
881 SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_CONNECTION_ID_IS_DIFFERENT);
887 static int server_verify(SSL *s)
891 if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A) {
892 p = (unsigned char *)s->init_buf->data;
893 *(p++) = SSL2_MT_SERVER_VERIFY;
894 if (s->s2->challenge_length > sizeof s->s2->challenge) {
895 SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
898 memcpy(p, s->s2->challenge, (unsigned int)s->s2->challenge_length);
899 /* p+=s->s2->challenge_length; */
901 s->state = SSL2_ST_SEND_SERVER_VERIFY_B;
902 s->init_num = s->s2->challenge_length + 1;
905 return (ssl2_do_write(s));
908 static int server_finish(SSL *s)
912 if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A) {
913 p = (unsigned char *)s->init_buf->data;
914 *(p++) = SSL2_MT_SERVER_FINISHED;
916 if (s->session->session_id_length > sizeof s->session->session_id) {
917 SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
920 memcpy(p, s->session->session_id,
921 (unsigned int)s->session->session_id_length);
922 /* p+=s->session->session_id_length; */
924 s->state = SSL2_ST_SEND_SERVER_FINISHED_B;
925 s->init_num = s->session->session_id_length + 1;
929 /* SSL2_ST_SEND_SERVER_FINISHED_B */
930 return (ssl2_do_write(s));
933 /* send the request and check the response */
934 static int request_certificate(SSL *s)
936 const unsigned char *cp;
937 unsigned char *p, *p2, *buf2;
939 int i, j, ctype, ret = -1;
942 STACK_OF(X509) *sk = NULL;
944 ccd = s->s2->tmp.ccl;
945 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A) {
946 p = (unsigned char *)s->init_buf->data;
947 *(p++) = SSL2_MT_REQUEST_CERTIFICATE;
948 *(p++) = SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
949 if (RAND_pseudo_bytes(ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
951 memcpy(p, ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH);
953 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
954 s->init_num = SSL2_MIN_CERT_CHALLENGE_LENGTH + 2;
958 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B) {
959 i = ssl2_do_write(s);
966 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
969 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C) {
970 p = (unsigned char *)s->init_buf->data;
971 /* try to read 6 octets ... */
972 i = ssl2_read(s, (char *)&(p[s->init_num]), 6 - s->init_num);
974 * ... but don't call ssl2_part_read now if we got at least 3
975 * (probably NO-CERTIFICATE-ERROR)
977 if (i < 3 - s->init_num) {
978 ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i);
983 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR)) {
985 if (i != SSL2_PE_NO_CERTIFICATE) {
987 * not the error message we expected -- let ssl2_part_read
991 ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, 3);
995 if (s->msg_callback) {
997 s->msg_callback(0, s->version, 0, p, 3, s,
998 s->msg_callback_arg);
1002 * this is the one place where we can recover from an SSL 2.0
1006 if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
1007 ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE);
1008 SSLerr(SSL_F_REQUEST_CERTIFICATE,
1009 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1015 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6)) {
1016 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
1017 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_SHORT_READ);
1020 if (s->init_num != 6) {
1021 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1025 /* ok we have a response */
1026 /* certificate type, there is only one right now. */
1028 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION) {
1029 ssl2_return_error(s, SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1030 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_RESPONSE_ARGUMENT);
1034 s->s2->tmp.clen = i;
1036 s->s2->tmp.rlen = i;
1037 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1040 /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1041 p = (unsigned char *)s->init_buf->data;
1042 len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1043 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
1044 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_MESSAGE_TOO_LONG);
1047 j = (int)len - s->init_num;
1048 i = ssl2_read(s, (char *)&(p[s->init_num]), j);
1050 ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i);
1053 if (s->msg_callback) {
1054 /* CLIENT-CERTIFICATE */
1055 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg);
1060 x509 = (X509 *)d2i_X509(NULL, &cp, (long)s->s2->tmp.clen);
1062 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_X509_LIB);
1066 if (((sk = sk_X509_new_null()) == NULL) || (!sk_X509_push(sk, x509))) {
1067 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1071 i = ssl_verify_cert_chain(s, sk);
1073 if (i > 0) { /* we like the packet, now check the chksum */
1075 EVP_PKEY *pkey = NULL;
1077 EVP_MD_CTX_init(&ctx);
1078 if (!EVP_VerifyInit_ex(&ctx, s->ctx->rsa_md5, NULL)
1079 || !EVP_VerifyUpdate(&ctx, s->s2->key_material,
1080 s->s2->key_material_length)
1081 || !EVP_VerifyUpdate(&ctx, ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH))
1084 i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL);
1085 buf2 = OPENSSL_malloc((unsigned int)i);
1087 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1091 i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, &p2);
1092 if (!EVP_VerifyUpdate(&ctx, buf2, (unsigned int)i)) {
1098 pkey = X509_get_pubkey(x509);
1101 i = EVP_VerifyFinal(&ctx, cp, s->s2->tmp.rlen, pkey);
1102 EVP_PKEY_free(pkey);
1103 EVP_MD_CTX_cleanup(&ctx);
1106 if (s->session->peer != NULL)
1107 X509_free(s->session->peer);
1108 s->session->peer = x509;
1109 CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
1110 s->session->verify_result = s->verify_result;
1114 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_CHECKSUM);
1119 ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE);
1127 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1128 unsigned char *to, int padding)
1133 if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)) {
1134 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_NO_PRIVATEKEY);
1137 if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA) {
1138 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1141 rsa = c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1143 /* we have the public key */
1144 i = RSA_private_decrypt(len, from, to, rsa, padding);
1146 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, ERR_R_RSA_LIB);
1149 #else /* !OPENSSL_NO_SSL2 */
1152 static void *dummy = &dummy;