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 const 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 const 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;
189 if (s->init_buf == NULL) {
190 if ((buf = BUF_MEM_new()) == NULL) {
195 (buf, (int)SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) {
203 s->ctx->stats.sess_accept++;
204 s->handshake_func = ssl2_accept;
205 s->state = SSL2_ST_GET_CLIENT_HELLO_A;
208 case SSL2_ST_GET_CLIENT_HELLO_A:
209 case SSL2_ST_GET_CLIENT_HELLO_B:
210 case SSL2_ST_GET_CLIENT_HELLO_C:
212 ret = get_client_hello(s);
216 s->state = SSL2_ST_SEND_SERVER_HELLO_A;
219 case SSL2_ST_SEND_SERVER_HELLO_A:
220 case SSL2_ST_SEND_SERVER_HELLO_B:
221 ret = server_hello(s);
226 s->state = SSL2_ST_GET_CLIENT_MASTER_KEY_A;
229 s->state = SSL2_ST_SERVER_START_ENCRYPTION;
232 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
233 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
234 ret = get_client_master_key(s);
238 s->state = SSL2_ST_SERVER_START_ENCRYPTION;
241 case SSL2_ST_SERVER_START_ENCRYPTION:
243 * Ok we how have sent all the stuff needed to start encrypting,
244 * the next packet back will be encrypted.
246 if (!ssl2_enc_init(s, 0)) {
250 s->s2->clear_text = 0;
251 s->state = SSL2_ST_SEND_SERVER_VERIFY_A;
254 case SSL2_ST_SEND_SERVER_VERIFY_A:
255 case SSL2_ST_SEND_SERVER_VERIFY_B:
256 ret = server_verify(s);
262 * If we are in here, we have been buffering the output, so
263 * we need to flush it and remove buffering from future
266 s->state = SSL2_ST_SEND_SERVER_VERIFY_C;
269 s->state = SSL2_ST_GET_CLIENT_FINISHED_A;
273 case SSL2_ST_SEND_SERVER_VERIFY_C:
274 /* get the number of bytes to write */
275 num1 = BIO_ctrl(s->wbio, BIO_CTRL_INFO, 0, NULL);
277 s->rwstate = SSL_WRITING;
278 num1 = BIO_flush(s->wbio);
283 s->rwstate = SSL_NOTHING;
286 /* flushed and now remove buffering */
287 s->wbio = BIO_pop(s->wbio);
289 s->state = SSL2_ST_GET_CLIENT_FINISHED_A;
292 case SSL2_ST_GET_CLIENT_FINISHED_A:
293 case SSL2_ST_GET_CLIENT_FINISHED_B:
294 ret = get_client_finished(s);
298 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
301 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
302 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
303 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
304 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
306 * don't do a 'request certificate' if we don't want to, or we
307 * already have one, and we only want to do it once.
309 if (!(s->verify_mode & SSL_VERIFY_PEER) ||
310 ((s->session->peer != NULL) &&
311 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE))) {
312 s->state = SSL2_ST_SEND_SERVER_FINISHED_A;
315 ret = request_certificate(s);
319 s->state = SSL2_ST_SEND_SERVER_FINISHED_A;
323 case SSL2_ST_SEND_SERVER_FINISHED_A:
324 case SSL2_ST_SEND_SERVER_FINISHED_B:
325 ret = server_finish(s);
329 s->state = SSL_ST_OK;
333 BUF_MEM_free(s->init_buf);
334 ssl_free_wbio_buffer(s);
337 /* ERR_clear_error(); */
339 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
341 s->ctx->stats.sess_accept_good++;
346 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
352 SSLerr(SSL_F_SSL2_ACCEPT, SSL_R_UNKNOWN_STATE);
358 if ((cb != NULL) && (s->state != state)) {
359 new_state = s->state;
361 cb(s, SSL_CB_ACCEPT_LOOP, 1);
362 s->state = new_state;
368 cb(s, SSL_CB_ACCEPT_EXIT, ret);
372 static int get_client_master_key(SSL *s)
374 int is_export, i, n, keya;
378 const SSL_CIPHER *cp;
382 p = (unsigned char *)s->init_buf->data;
383 if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A) {
384 i = ssl2_read(s, (char *)&(p[s->init_num]), 10 - s->init_num);
386 if (i < (10 - s->init_num))
387 return (ssl2_part_read(s, SSL_F_GET_CLIENT_MASTER_KEY, i));
390 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY) {
391 if (p[-1] != SSL2_MT_ERROR) {
392 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
393 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
394 SSL_R_READ_WRONG_PACKET_TYPE);
396 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
400 cp = ssl2_get_cipher_by_char(p);
402 ssl2_return_error(s, SSL2_PE_NO_CIPHER);
403 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
406 s->session->cipher = cp;
410 s->s2->tmp.clear = i;
414 if (i > SSL_MAX_KEY_ARG_LENGTH) {
415 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
416 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
419 s->session->key_arg_length = i;
420 s->state = SSL2_ST_GET_CLIENT_MASTER_KEY_B;
423 /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
424 p = (unsigned char *)s->init_buf->data;
425 if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
426 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
427 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
430 keya = s->session->key_arg_length;
432 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc +
434 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
435 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
436 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_MESSAGE_TOO_LONG);
439 n = (int)len - s->init_num;
440 i = ssl2_read(s, (char *)&(p[s->init_num]), n);
442 return (ssl2_part_read(s, SSL_F_GET_CLIENT_MASTER_KEY, i));
443 if (s->msg_callback) {
444 /* CLIENT-MASTER-KEY */
445 s->msg_callback(0, s->version, 0, p, (size_t)len, s,
446 s->msg_callback_arg);
450 memcpy(s->session->key_arg, &(p[s->s2->tmp.clear + s->s2->tmp.enc]),
453 if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL) {
454 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
455 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_PRIVATEKEY);
459 is_export = SSL_C_IS_EXPORT(s->session->cipher);
461 if (!ssl_cipher_get_evp(s->session, &c, &md, NULL, NULL, NULL)) {
462 ssl2_return_error(s, SSL2_PE_NO_CIPHER);
463 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
464 SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
468 if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC) {
475 * The format of the CLIENT-MASTER-KEY message is
476 * 1 byte message type
478 * 2-byte clear key length (stored in s->s2->tmp.clear)
479 * 2-byte encrypted key length (stored in s->s2->tmp.enc)
480 * 2-byte key args length (IV etc)
485 * If the cipher is an export cipher, then the encrypted key bytes
486 * are a fixed portion of the total key (5 or 8 bytes). The size of
487 * this portion is in |ek|. If the cipher is not an export cipher,
488 * then the entire key material is encrypted (i.e., clear key length
491 if ((!is_export && s->s2->tmp.clear != 0) ||
492 (is_export && s->s2->tmp.clear + ek != (unsigned int)EVP_CIPHER_key_length(c))) {
493 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
494 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_LENGTH);
498 * The encrypted blob must decrypt to the encrypted portion of the key.
499 * Decryption can't be expanding, so if we don't have enough encrypted
500 * bytes to fit the key in the buffer, stop now.
502 if ((is_export && s->s2->tmp.enc < ek) ||
503 (!is_export && s->s2->tmp.enc < (unsigned int)EVP_CIPHER_key_length(c))) {
504 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
505 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_LENGTH_TOO_SHORT);
509 i = ssl_rsa_private_decrypt(s->cert, s->s2->tmp.enc,
510 &(p[s->s2->tmp.clear]),
511 &(p[s->s2->tmp.clear]),
512 (s->s2->ssl2_rollback) ? RSA_SSLV23_PADDING :
518 * If a bad decrypt, continue with protocol but with a random master
519 * secret (Bleichenbacher attack)
521 if ((i < 0) || ((!is_export && i != EVP_CIPHER_key_length(c))
522 || (is_export && i != (int)ek))) {
527 i = EVP_CIPHER_key_length(c);
528 if (RAND_pseudo_bytes(&p[s->s2->tmp.clear], i) <= 0)
534 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_BAD_RSA_DECRYPT);
536 /* incorrect number of key bytes for non export cipher */
537 else if ((!is_export && (i != EVP_CIPHER_key_length(c)))
538 || (is_export && ((i != ek) || (s->s2->tmp.clear + i !=
539 EVP_CIPHER_key_length(c))))) {
541 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_WRONG_NUMBER_OF_KEY_BITS);
544 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
550 i = EVP_CIPHER_key_length(c);
552 if (i > SSL_MAX_MASTER_KEY_LENGTH) {
553 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
554 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
557 s->session->master_key_length = i;
558 memcpy(s->session->master_key, p, (unsigned int)i);
562 static int get_client_hello(SSL *s)
567 STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
568 STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
569 STACK_OF(SSL_CIPHER) *prio, *allow;
573 * This is a bit of a hack to check for the correct packet type the first
576 if (s->state == SSL2_ST_GET_CLIENT_HELLO_A) {
578 s->state = SSL2_ST_GET_CLIENT_HELLO_B;
581 p = (unsigned char *)s->init_buf->data;
582 if (s->state == SSL2_ST_GET_CLIENT_HELLO_B) {
583 i = ssl2_read(s, (char *)&(p[s->init_num]), 9 - s->init_num);
584 if (i < (9 - s->init_num))
585 return (ssl2_part_read(s, SSL_F_GET_CLIENT_HELLO, i));
588 if (*(p++) != SSL2_MT_CLIENT_HELLO) {
589 if (p[-1] != SSL2_MT_ERROR) {
590 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
591 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_READ_WRONG_PACKET_TYPE);
593 SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_PEER_ERROR);
600 s->s2->tmp.cipher_spec_length = i;
602 s->s2->tmp.session_id_length = i;
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);
692 for (z = 0; z < sk_SSL_CIPHER_num(prio); z++) {
693 if (sk_SSL_CIPHER_find(allow, sk_SSL_CIPHER_value(prio, z)) < 0) {
694 (void)sk_SSL_CIPHER_delete(prio, z);
698 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
699 sk_SSL_CIPHER_free(s->session->ciphers);
700 s->session->ciphers = prio;
703 * s->session->ciphers should now have a list of ciphers that are on
704 * both the client and server. This list is ordered by the order the
705 * client sent the ciphers or in the order of the server's preference
706 * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
709 p += s->s2->tmp.cipher_spec_length;
710 /* done cipher selection */
712 /* session id extracted already */
713 p += s->s2->tmp.session_id_length;
716 if (s->s2->challenge_length > sizeof s->s2->challenge) {
717 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
718 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
721 memcpy(s->s2->challenge, p, (unsigned int)s->s2->challenge_length);
724 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_MALLOC_FAILURE);
728 static int server_hello(SSL *s)
730 unsigned char *p, *d;
733 p = (unsigned char *)s->init_buf->data;
734 if (s->state == SSL2_ST_SEND_SERVER_HELLO_A) {
736 *(p++) = SSL2_MT_SERVER_HELLO; /* type */
738 *(p++) = (unsigned char)hit;
741 if (s->session->sess_cert != NULL)
743 * This can't really happen because get_client_hello has
744 * called ssl_get_new_session, which does not set sess_cert.
746 ssl_sess_cert_free(s->session->sess_cert);
747 s->session->sess_cert = ssl_sess_cert_new();
748 if (s->session->sess_cert == NULL) {
749 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
754 * If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
755 * depending on whether it survived in the internal cache or was
756 * retrieved from an external cache. If it is NULL, we cannot put any
757 * useful data in it anyway, so we don't touch it.
760 # else /* That's what used to be done when cert_st
761 * and sess_cert_st were * the same. */
762 if (!hit) { /* else add cert to session */
763 CRYPTO_add(&s->cert->references, 1, CRYPTO_LOCK_SSL_CERT);
764 if (s->session->sess_cert != NULL)
765 ssl_cert_free(s->session->sess_cert);
766 s->session->sess_cert = s->cert;
767 } else { /* We have a session id-cache hit, if the *
768 * session-id has no certificate listed
769 * against * the 'cert' structure, grab the
770 * 'old' one * listed against the SSL
772 if (s->session->sess_cert == NULL) {
773 CRYPTO_add(&s->cert->references, 1, CRYPTO_LOCK_SSL_CERT);
774 s->session->sess_cert = s->cert;
779 if (s->cert == NULL) {
780 ssl2_return_error(s, SSL2_PE_NO_CERTIFICATE);
781 SSLerr(SSL_F_SERVER_HELLO, SSL_R_NO_CERTIFICATE_SPECIFIED);
786 *(p++) = 0; /* no certificate type */
787 s2n(s->version, p); /* version */
788 s2n(0, p); /* cert len */
789 s2n(0, p); /* ciphers len */
792 /* put certificate type */
793 *(p++) = SSL2_CT_X509_CERTIFICATE;
794 s2n(s->version, p); /* version */
795 n = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL);
796 s2n(n, p); /* certificate length */
797 i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, &d);
801 * lets send out the ciphers we like in the prefered order
803 n = ssl_cipher_list_to_bytes(s, s->session->ciphers, d, 0);
805 s2n(n, p); /* add cipher length */
808 /* make and send conn_id */
809 s2n(SSL2_CONNECTION_ID_LENGTH, p); /* add conn_id length */
810 s->s2->conn_id_length = SSL2_CONNECTION_ID_LENGTH;
811 if (RAND_pseudo_bytes(s->s2->conn_id, (int)s->s2->conn_id_length) <=
814 memcpy(d, s->s2->conn_id, SSL2_CONNECTION_ID_LENGTH);
815 d += SSL2_CONNECTION_ID_LENGTH;
817 s->state = SSL2_ST_SEND_SERVER_HELLO_B;
818 s->init_num = d - (unsigned char *)s->init_buf->data;
821 /* SSL2_ST_SEND_SERVER_HELLO_B */
823 * If we are using TCP/IP, the performance is bad if we do 2 writes
824 * without a read between them. This occurs when Session-id reuse is
825 * used, so I will put in a buffering module
828 if (!ssl_init_wbio_buffer(s, 1))
832 return (ssl2_do_write(s));
835 static int get_client_finished(SSL *s)
841 p = (unsigned char *)s->init_buf->data;
842 if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A) {
843 i = ssl2_read(s, (char *)&(p[s->init_num]), 1 - s->init_num);
844 if (i < 1 - s->init_num)
845 return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i));
848 if (*p != SSL2_MT_CLIENT_FINISHED) {
849 if (*p != SSL2_MT_ERROR) {
850 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
851 SSLerr(SSL_F_GET_CLIENT_FINISHED,
852 SSL_R_READ_WRONG_PACKET_TYPE);
854 SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_PEER_ERROR);
855 /* try to read the error message */
856 i = ssl2_read(s, (char *)&(p[s->init_num]), 3 - s->init_num);
857 return ssl2_part_read(s, SSL_F_GET_SERVER_VERIFY, i);
861 s->state = SSL2_ST_GET_CLIENT_FINISHED_B;
864 /* SSL2_ST_GET_CLIENT_FINISHED_B */
865 if (s->s2->conn_id_length > sizeof s->s2->conn_id) {
866 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
867 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
870 len = 1 + (unsigned long)s->s2->conn_id_length;
871 n = (int)len - s->init_num;
872 i = ssl2_read(s, (char *)&(p[s->init_num]), n);
874 return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i));
876 if (s->msg_callback) {
877 /* CLIENT-FINISHED */
878 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg);
881 if (memcmp(p, s->s2->conn_id, s->s2->conn_id_length) != 0) {
882 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
883 SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_CONNECTION_ID_IS_DIFFERENT);
889 static int server_verify(SSL *s)
893 if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A) {
894 p = (unsigned char *)s->init_buf->data;
895 *(p++) = SSL2_MT_SERVER_VERIFY;
896 if (s->s2->challenge_length > sizeof s->s2->challenge) {
897 SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
900 memcpy(p, s->s2->challenge, (unsigned int)s->s2->challenge_length);
901 /* p+=s->s2->challenge_length; */
903 s->state = SSL2_ST_SEND_SERVER_VERIFY_B;
904 s->init_num = s->s2->challenge_length + 1;
907 return (ssl2_do_write(s));
910 static int server_finish(SSL *s)
914 if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A) {
915 p = (unsigned char *)s->init_buf->data;
916 *(p++) = SSL2_MT_SERVER_FINISHED;
918 if (s->session->session_id_length > sizeof s->session->session_id) {
919 SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
922 memcpy(p, s->session->session_id,
923 (unsigned int)s->session->session_id_length);
924 /* p+=s->session->session_id_length; */
926 s->state = SSL2_ST_SEND_SERVER_FINISHED_B;
927 s->init_num = s->session->session_id_length + 1;
931 /* SSL2_ST_SEND_SERVER_FINISHED_B */
932 return (ssl2_do_write(s));
935 /* send the request and check the response */
936 static int request_certificate(SSL *s)
938 const unsigned char *cp;
939 unsigned char *p, *p2, *buf2;
941 int i, j, ctype, ret = -1;
944 STACK_OF(X509) *sk = NULL;
946 ccd = s->s2->tmp.ccl;
947 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A) {
948 p = (unsigned char *)s->init_buf->data;
949 *(p++) = SSL2_MT_REQUEST_CERTIFICATE;
950 *(p++) = SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
951 if (RAND_pseudo_bytes(ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
953 memcpy(p, ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH);
955 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
956 s->init_num = SSL2_MIN_CERT_CHALLENGE_LENGTH + 2;
960 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B) {
961 i = ssl2_do_write(s);
968 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
971 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C) {
972 p = (unsigned char *)s->init_buf->data;
973 /* try to read 6 octets ... */
974 i = ssl2_read(s, (char *)&(p[s->init_num]), 6 - s->init_num);
976 * ... but don't call ssl2_part_read now if we got at least 3
977 * (probably NO-CERTIFICATE-ERROR)
979 if (i < 3 - s->init_num) {
980 ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i);
985 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR)) {
987 if (i != SSL2_PE_NO_CERTIFICATE) {
989 * not the error message we expected -- let ssl2_part_read
993 ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, 3);
997 if (s->msg_callback) {
999 s->msg_callback(0, s->version, 0, p, 3, s,
1000 s->msg_callback_arg);
1004 * this is the one place where we can recover from an SSL 2.0
1008 if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
1009 ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE);
1010 SSLerr(SSL_F_REQUEST_CERTIFICATE,
1011 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1017 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6)) {
1018 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
1019 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_SHORT_READ);
1022 if (s->init_num != 6) {
1023 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1027 /* ok we have a response */
1028 /* certificate type, there is only one right now. */
1030 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION) {
1031 ssl2_return_error(s, SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1032 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_RESPONSE_ARGUMENT);
1036 s->s2->tmp.clen = i;
1038 s->s2->tmp.rlen = i;
1039 s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1042 /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1043 p = (unsigned char *)s->init_buf->data;
1044 len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1045 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) {
1046 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_MESSAGE_TOO_LONG);
1049 j = (int)len - s->init_num;
1050 i = ssl2_read(s, (char *)&(p[s->init_num]), j);
1052 ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i);
1055 if (s->msg_callback) {
1056 /* CLIENT-CERTIFICATE */
1057 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg);
1062 x509 = (X509 *)d2i_X509(NULL, &cp, (long)s->s2->tmp.clen);
1064 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_X509_LIB);
1068 if (((sk = sk_X509_new_null()) == NULL) || (!sk_X509_push(sk, x509))) {
1069 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1073 i = ssl_verify_cert_chain(s, sk);
1075 if (i > 0) { /* we like the packet, now check the chksum */
1077 EVP_PKEY *pkey = NULL;
1079 EVP_MD_CTX_init(&ctx);
1080 if (!EVP_VerifyInit_ex(&ctx, s->ctx->rsa_md5, NULL)
1081 || !EVP_VerifyUpdate(&ctx, s->s2->key_material,
1082 s->s2->key_material_length)
1083 || !EVP_VerifyUpdate(&ctx, ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH))
1086 i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL);
1087 buf2 = OPENSSL_malloc((unsigned int)i);
1089 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1093 i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, &p2);
1094 if (!EVP_VerifyUpdate(&ctx, buf2, (unsigned int)i)) {
1100 pkey = X509_get_pubkey(x509);
1103 i = EVP_VerifyFinal(&ctx, cp, s->s2->tmp.rlen, pkey);
1104 EVP_PKEY_free(pkey);
1105 EVP_MD_CTX_cleanup(&ctx);
1108 if (s->session->peer != NULL)
1109 X509_free(s->session->peer);
1110 s->session->peer = x509;
1111 CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
1112 s->session->verify_result = s->verify_result;
1116 SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_CHECKSUM);
1121 ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE);
1129 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1130 unsigned char *to, int padding)
1135 if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)) {
1136 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_NO_PRIVATEKEY);
1139 if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA) {
1140 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1143 rsa = c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1145 /* we have the public key */
1146 i = RSA_private_decrypt(len, from, to, rsa, padding);
1148 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, ERR_R_RSA_LIB);
1151 #else /* !OPENSSL_NO_SSL2 */
1154 static void *dummy = &dummy;