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);
405 if (cp == NULL || sk_SSL_CIPHER_find(s->session->ciphers, cp) < 0) {
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
529 if (RAND_bytes(rand_premaster_secret,
530 (int)num_encrypted_key_bytes) <= 0)
533 i = ssl_rsa_private_decrypt(s->cert, s->s2->tmp.enc,
534 &(p[s->s2->tmp.clear]),
535 &(p[s->s2->tmp.clear]),
536 (s->s2->ssl2_rollback) ? RSA_SSLV23_PADDING :
540 * If a bad decrypt, continue with protocol but with a random master
541 * secret (Bleichenbacher attack)
543 decrypt_good = constant_time_eq_int_8(i, (int)num_encrypted_key_bytes);
544 for (j = 0; j < num_encrypted_key_bytes; j++) {
545 p[s->s2->tmp.clear + j] =
546 constant_time_select_8(decrypt_good, p[s->s2->tmp.clear + j],
547 rand_premaster_secret[j]);
550 s->session->master_key_length = (int)key_length;
551 memcpy(s->session->master_key, p, key_length);
552 OPENSSL_cleanse(p, key_length);
557 static int get_client_hello(SSL *s)
562 STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
563 STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
564 STACK_OF(SSL_CIPHER) *prio, *allow;
568 * This is a bit of a hack to check for the correct packet type the first
571 if (s->state == SSL2_ST_GET_CLIENT_HELLO_A) {
573 s->state = SSL2_ST_GET_CLIENT_HELLO_B;
576 p = (unsigned char *)s->init_buf->data;
577 if (s->state == SSL2_ST_GET_CLIENT_HELLO_B) {
578 i = ssl2_read(s, (char *)&(p[s->init_num]), 9 - s->init_num);
579 if (i < (9 - s->init_num))
580 return (ssl2_part_read(s, SSL_F_GET_CLIENT_HELLO, i));
583 if (*(p++) != SSL2_MT_CLIENT_HELLO) {
584 if (p[-1] != SSL2_MT_ERROR) {
585 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
586 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_READ_WRONG_PACKET_TYPE);
588 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_PEER_ERROR);
595 s->s2->tmp.cipher_spec_length = i;
597 s->s2->tmp.session_id_length = i;
598 if ((i < 0) || (i > SSL_MAX_SSL_SESSION_ID_LENGTH)) {
599 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
600 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
604 s->s2->challenge_length = i;
605 if ((i < SSL2_MIN_CHALLENGE_LENGTH) ||
606 (i > SSL2_MAX_CHALLENGE_LENGTH)) {
607 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
608 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_INVALID_CHALLENGE_LENGTH);
611 s->state = SSL2_ST_GET_CLIENT_HELLO_C;
614 /* SSL2_ST_GET_CLIENT_HELLO_C */
615 p = (unsigned char *)s->init_buf->data;
617 9 + (unsigned long)s->s2->tmp.cipher_spec_length +
618 (unsigned long)s->s2->challenge_length +
619 (unsigned long)s->s2->tmp.session_id_length;
620 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
621 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
622 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_MESSAGE_TOO_LONG);
625 n = (int)len - s->init_num;
626 i = ssl2_read(s, (char *)&(p[s->init_num]), n);
628 return (ssl2_part_read(s, SSL_F_GET_CLIENT_HELLO, i));
629 if (s->msg_callback) {
631 s->msg_callback(0, s->version, 0, p, (size_t)len, s,
632 s->msg_callback_arg);
637 * get session-id before cipher stuff so we can get out session structure
641 if ((s->s2->tmp.session_id_length != 0) &&
642 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH)) {
643 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
644 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_BAD_SSL_SESSION_ID_LENGTH);
648 if (s->s2->tmp.session_id_length == 0) {
649 if (!ssl_get_new_session(s, 1)) {
650 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
654 i = ssl_get_prev_session(s, &(p[s->s2->tmp.cipher_spec_length]),
655 s->s2->tmp.session_id_length, NULL);
656 if (i == 1) { /* previous session */
658 } else if (i == -1) {
659 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
662 if (s->cert == NULL) {
663 ssl2_return_error(s, SSL2_PE_NO_CERTIFICATE);
664 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_NO_CERTIFICATE_SET);
668 if (!ssl_get_new_session(s, 1)) {
669 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
676 cs = ssl_bytes_to_cipher_list(s, p, s->s2->tmp.cipher_spec_length,
677 &s->session->ciphers);
681 cl = SSL_get_ciphers(s);
683 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
684 prio = sk_SSL_CIPHER_dup(cl);
693 /* Generate list of SSLv2 ciphers shared between client and server */
694 for (z = 0; z < sk_SSL_CIPHER_num(prio); z++) {
695 const SSL_CIPHER *cp = sk_SSL_CIPHER_value(prio, z);
696 if ((cp->algorithm_ssl & SSL_SSLV2) == 0 ||
697 sk_SSL_CIPHER_find(allow, cp) < 0) {
698 (void)sk_SSL_CIPHER_delete(prio, z);
702 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
703 sk_SSL_CIPHER_free(s->session->ciphers);
704 s->session->ciphers = prio;
707 /* Make sure we have at least one cipher in common */
708 if (sk_SSL_CIPHER_num(s->session->ciphers) == 0) {
709 ssl2_return_error(s, SSL2_PE_NO_CIPHER);
710 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_NO_CIPHER_MATCH);
714 * s->session->ciphers should now have a list of ciphers that are on
715 * both the client and server. This list is ordered by the order the
716 * client sent the ciphers or in the order of the server's preference
717 * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
720 p += s->s2->tmp.cipher_spec_length;
721 /* done cipher selection */
723 /* session id extracted already */
724 p += s->s2->tmp.session_id_length;
727 if (s->s2->challenge_length > sizeof s->s2->challenge) {
728 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
729 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
732 memcpy(s->s2->challenge, p, (unsigned int)s->s2->challenge_length);
735 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_MALLOC_FAILURE);
739 static int server_hello(SSL *s)
741 unsigned char *p, *d;
744 p = (unsigned char *)s->init_buf->data;
745 if (s->state == SSL2_ST_SEND_SERVER_HELLO_A) {
747 *(p++) = SSL2_MT_SERVER_HELLO; /* type */
749 *(p++) = (unsigned char)hit;
752 if (s->session->sess_cert != NULL)
754 * This can't really happen because get_client_hello has
755 * called ssl_get_new_session, which does not set sess_cert.
757 ssl_sess_cert_free(s->session->sess_cert);
758 s->session->sess_cert = ssl_sess_cert_new();
759 if (s->session->sess_cert == NULL) {
760 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
765 * If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
766 * depending on whether it survived in the internal cache or was
767 * retrieved from an external cache. If it is NULL, we cannot put any
768 * useful data in it anyway, so we don't touch it.
771 # else /* That's what used to be done when cert_st
772 * and sess_cert_st were * the same. */
773 if (!hit) { /* else add cert to session */
774 CRYPTO_add(&s->cert->references, 1, CRYPTO_LOCK_SSL_CERT);
775 if (s->session->sess_cert != NULL)
776 ssl_cert_free(s->session->sess_cert);
777 s->session->sess_cert = s->cert;
778 } else { /* We have a session id-cache hit, if the *
779 * session-id has no certificate listed
780 * against * the 'cert' structure, grab the
781 * 'old' one * listed against the SSL
783 if (s->session->sess_cert == NULL) {
784 CRYPTO_add(&s->cert->references, 1, CRYPTO_LOCK_SSL_CERT);
785 s->session->sess_cert = s->cert;
790 if (s->cert == NULL) {
791 ssl2_return_error(s, SSL2_PE_NO_CERTIFICATE);
792 SSLerr(SSL_F_SERVER_HELLO, SSL_R_NO_CERTIFICATE_SPECIFIED);
797 *(p++) = 0; /* no certificate type */
798 s2n(s->version, p); /* version */
799 s2n(0, p); /* cert len */
800 s2n(0, p); /* ciphers len */
803 /* put certificate type */
804 *(p++) = SSL2_CT_X509_CERTIFICATE;
805 s2n(s->version, p); /* version */
806 n = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL);
807 s2n(n, p); /* certificate length */
808 i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, &d);
812 * lets send out the ciphers we like in the prefered order
814 n = ssl_cipher_list_to_bytes(s, s->session->ciphers, d, 0);
816 s2n(n, p); /* add cipher length */
819 /* make and send conn_id */
820 s2n(SSL2_CONNECTION_ID_LENGTH, p); /* add conn_id length */
821 s->s2->conn_id_length = SSL2_CONNECTION_ID_LENGTH;
822 if (RAND_bytes(s->s2->conn_id, (int)s->s2->conn_id_length) <= 0)
824 memcpy(d, s->s2->conn_id, SSL2_CONNECTION_ID_LENGTH);
825 d += SSL2_CONNECTION_ID_LENGTH;
827 s->state = SSL2_ST_SEND_SERVER_HELLO_B;
828 s->init_num = d - (unsigned char *)s->init_buf->data;
831 /* SSL2_ST_SEND_SERVER_HELLO_B */
833 * If we are using TCP/IP, the performance is bad if we do 2 writes
834 * without a read between them. This occurs when Session-id reuse is
835 * used, so I will put in a buffering module
838 if (!ssl_init_wbio_buffer(s, 1))
842 return (ssl2_do_write(s));
845 static int get_client_finished(SSL *s)
851 p = (unsigned char *)s->init_buf->data;
852 if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A) {
853 i = ssl2_read(s, (char *)&(p[s->init_num]), 1 - s->init_num);
854 if (i < 1 - s->init_num)
855 return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i));
858 if (*p != SSL2_MT_CLIENT_FINISHED) {
859 if (*p != SSL2_MT_ERROR) {
860 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
861 SSLerr(SSL_F_GET_CLIENT_FINISHED,
862 SSL_R_READ_WRONG_PACKET_TYPE);
864 SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_PEER_ERROR);
865 /* try to read the error message */
866 i = ssl2_read(s, (char *)&(p[s->init_num]), 3 - s->init_num);
867 return ssl2_part_read(s, SSL_F_GET_SERVER_VERIFY, i);
871 s->state = SSL2_ST_GET_CLIENT_FINISHED_B;
874 /* SSL2_ST_GET_CLIENT_FINISHED_B */
875 if (s->s2->conn_id_length > sizeof s->s2->conn_id) {
876 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
877 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
880 len = 1 + (unsigned long)s->s2->conn_id_length;
881 n = (int)len - s->init_num;
882 i = ssl2_read(s, (char *)&(p[s->init_num]), n);
884 return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i));
886 if (s->msg_callback) {
887 /* CLIENT-FINISHED */
888 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg);
891 if (memcmp(p, s->s2->conn_id, s->s2->conn_id_length) != 0) {
892 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
893 SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_CONNECTION_ID_IS_DIFFERENT);
899 static int server_verify(SSL *s)
903 if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A) {
904 p = (unsigned char *)s->init_buf->data;
905 *(p++) = SSL2_MT_SERVER_VERIFY;
906 if (s->s2->challenge_length > sizeof s->s2->challenge) {
907 SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
910 memcpy(p, s->s2->challenge, (unsigned int)s->s2->challenge_length);
911 /* p+=s->s2->challenge_length; */
913 s->state = SSL2_ST_SEND_SERVER_VERIFY_B;
914 s->init_num = s->s2->challenge_length + 1;
917 return (ssl2_do_write(s));
920 static int server_finish(SSL *s)
924 if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A) {
925 p = (unsigned char *)s->init_buf->data;
926 *(p++) = SSL2_MT_SERVER_FINISHED;
928 if (s->session->session_id_length > sizeof s->session->session_id) {
929 SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
932 memcpy(p, s->session->session_id,
933 (unsigned int)s->session->session_id_length);
934 /* p+=s->session->session_id_length; */
936 s->state = SSL2_ST_SEND_SERVER_FINISHED_B;
937 s->init_num = s->session->session_id_length + 1;
941 /* SSL2_ST_SEND_SERVER_FINISHED_B */
942 return (ssl2_do_write(s));
945 /* send the request and check the response */
946 static int request_certificate(SSL *s)
948 const unsigned char *cp;
949 unsigned char *p, *p2, *buf2;
951 int i, j, ctype, ret = -1;
954 STACK_OF(X509) *sk = NULL;
956 ccd = s->s2->tmp.ccl;
957 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A) {
958 p = (unsigned char *)s->init_buf->data;
959 *(p++) = SSL2_MT_REQUEST_CERTIFICATE;
960 *(p++) = SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
961 if (RAND_bytes(ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
963 memcpy(p, ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH);
965 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
966 s->init_num = SSL2_MIN_CERT_CHALLENGE_LENGTH + 2;
970 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B) {
971 i = ssl2_do_write(s);
978 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
981 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C) {
982 p = (unsigned char *)s->init_buf->data;
983 /* try to read 6 octets ... */
984 i = ssl2_read(s, (char *)&(p[s->init_num]), 6 - s->init_num);
986 * ... but don't call ssl2_part_read now if we got at least 3
987 * (probably NO-CERTIFICATE-ERROR)
989 if (i < 3 - s->init_num) {
990 ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i);
995 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR)) {
997 if (i != SSL2_PE_NO_CERTIFICATE) {
999 * not the error message we expected -- let ssl2_part_read
1003 ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, 3);
1007 if (s->msg_callback) {
1009 s->msg_callback(0, s->version, 0, p, 3, s,
1010 s->msg_callback_arg);
1014 * this is the one place where we can recover from an SSL 2.0
1018 if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
1019 ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE);
1020 SSLerr(SSL_F_REQUEST_CERTIFICATE,
1021 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1027 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6)) {
1028 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
1029 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_SHORT_READ);
1032 if (s->init_num != 6) {
1033 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1037 /* ok we have a response */
1038 /* certificate type, there is only one right now. */
1040 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION) {
1041 ssl2_return_error(s, SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1042 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_RESPONSE_ARGUMENT);
1046 s->s2->tmp.clen = i;
1048 s->s2->tmp.rlen = i;
1049 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1052 /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1053 p = (unsigned char *)s->init_buf->data;
1054 len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1055 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
1056 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_MESSAGE_TOO_LONG);
1059 j = (int)len - s->init_num;
1060 i = ssl2_read(s, (char *)&(p[s->init_num]), j);
1062 ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i);
1065 if (s->msg_callback) {
1066 /* CLIENT-CERTIFICATE */
1067 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg);
1072 x509 = (X509 *)d2i_X509(NULL, &cp, (long)s->s2->tmp.clen);
1074 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_X509_LIB);
1078 if (((sk = sk_X509_new_null()) == NULL) || (!sk_X509_push(sk, x509))) {
1079 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1083 i = ssl_verify_cert_chain(s, sk);
1085 if (i > 0) { /* we like the packet, now check the chksum */
1087 EVP_PKEY *pkey = NULL;
1089 EVP_MD_CTX_init(&ctx);
1090 if (!EVP_VerifyInit_ex(&ctx, s->ctx->rsa_md5, NULL)
1091 || !EVP_VerifyUpdate(&ctx, s->s2->key_material,
1092 s->s2->key_material_length)
1093 || !EVP_VerifyUpdate(&ctx, ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH))
1096 i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL);
1097 buf2 = OPENSSL_malloc((unsigned int)i);
1099 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1103 i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, &p2);
1104 if (!EVP_VerifyUpdate(&ctx, buf2, (unsigned int)i)) {
1110 pkey = X509_get_pubkey(x509);
1113 i = EVP_VerifyFinal(&ctx, cp, s->s2->tmp.rlen, pkey);
1114 EVP_PKEY_free(pkey);
1115 EVP_MD_CTX_cleanup(&ctx);
1118 if (s->session->peer != NULL)
1119 X509_free(s->session->peer);
1120 s->session->peer = x509;
1121 CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
1122 s->session->verify_result = s->verify_result;
1126 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_CHECKSUM);
1131 ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE);
1139 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1140 unsigned char *to, int padding)
1145 if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)) {
1146 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_NO_PRIVATEKEY);
1149 if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA) {
1150 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1153 rsa = c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1155 /* we have the public key */
1156 i = RSA_private_decrypt(len, from, to, rsa, padding);
1158 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, ERR_R_RSA_LIB);
1161 #else /* !OPENSSL_NO_SSL2 */
1164 static void *dummy = &dummy;