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,
143 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;
154 RAND_add(&l,sizeof(l),0);
158 if (s->info_callback != NULL)
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)) SSL_clear(s);
169 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
182 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
183 case SSL_ST_OK|SSL_ST_ACCEPT:
186 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
188 s->version=SSL2_VERSION;
189 s->type=SSL_ST_ACCEPT;
192 if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
193 { ret= -1; goto end; }
194 if (!BUF_MEM_grow(buf,(int)
195 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
196 { ret= -1; goto end; }
199 s->ctx->stats.sess_accept++;
200 s->handshake_func=ssl2_accept;
201 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
204 case SSL2_ST_GET_CLIENT_HELLO_A:
205 case SSL2_ST_GET_CLIENT_HELLO_B:
206 case SSL2_ST_GET_CLIENT_HELLO_C:
208 ret=get_client_hello(s);
209 if (ret <= 0) goto end;
211 s->state=SSL2_ST_SEND_SERVER_HELLO_A;
214 case SSL2_ST_SEND_SERVER_HELLO_A:
215 case SSL2_ST_SEND_SERVER_HELLO_B:
217 if (ret <= 0) goto end;
221 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
226 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
229 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
230 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
231 ret=get_client_master_key(s);
232 if (ret <= 0) goto end;
234 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
237 case SSL2_ST_SERVER_START_ENCRYPTION:
238 /* Ok we how have sent all the stuff needed to
239 * start encrypting, the next packet back will
241 if (!ssl2_enc_init(s,0))
242 { ret= -1; goto end; }
244 s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
247 case SSL2_ST_SEND_SERVER_VERIFY_A:
248 case SSL2_ST_SEND_SERVER_VERIFY_B:
249 ret=server_verify(s);
250 if (ret <= 0) goto end;
254 /* If we are in here, we have been
255 * buffering the output, so we need to
256 * flush it and remove buffering from
258 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
263 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
267 case SSL2_ST_SEND_SERVER_VERIFY_C:
268 /* get the number of bytes to write */
269 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
272 s->rwstate=SSL_WRITING;
273 num1=BIO_flush(s->wbio);
274 if (num1 <= 0) { ret= -1; goto end; }
275 s->rwstate=SSL_NOTHING;
278 /* flushed and now remove buffering */
279 s->wbio=BIO_pop(s->wbio);
281 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
284 case SSL2_ST_GET_CLIENT_FINISHED_A:
285 case SSL2_ST_GET_CLIENT_FINISHED_B:
286 ret=get_client_finished(s);
290 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
293 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
294 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
295 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
296 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
297 /* don't do a 'request certificate' if we
298 * don't want to, or we already have one, and
299 * we only want to do it once. */
300 if (!(s->verify_mode & SSL_VERIFY_PEER) ||
301 ((s->session->peer != NULL) &&
302 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
304 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
309 ret=request_certificate(s);
310 if (ret <= 0) goto end;
312 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
316 case SSL2_ST_SEND_SERVER_FINISHED_A:
317 case SSL2_ST_SEND_SERVER_FINISHED_B:
318 ret=server_finish(s);
319 if (ret <= 0) goto end;
325 BUF_MEM_free(s->init_buf);
326 ssl_free_wbio_buffer(s);
329 /* ERR_clear_error();*/
331 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
333 s->ctx->stats.sess_accept_good++;
337 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
343 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
349 if ((cb != NULL) && (s->state != state))
353 cb(s,SSL_CB_ACCEPT_LOOP,1);
360 cb(s,SSL_CB_ACCEPT_EXIT,ret);
364 static int get_client_master_key(SSL *s)
366 int is_export,i,n,keya,ek;
373 p=(unsigned char *)s->init_buf->data;
374 if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
376 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
378 if (i < (10-s->init_num))
379 return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
382 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
384 if (p[-1] != SSL2_MT_ERROR)
386 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
387 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
390 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
394 cp=ssl2_get_cipher_by_char(p);
397 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
398 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
401 s->session->cipher= cp;
404 n2s(p,i); s->s2->tmp.clear=i;
405 n2s(p,i); s->s2->tmp.enc=i;
407 if(i > SSL_MAX_KEY_ARG_LENGTH)
409 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
410 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
413 s->session->key_arg_length=i;
414 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
417 /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
418 p=(unsigned char *)s->init_buf->data;
419 if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
421 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
422 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
425 keya=s->session->key_arg_length;
426 len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + (unsigned long)keya;
427 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
429 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
430 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG);
433 n = (int)len - s->init_num;
434 i = ssl2_read(s,(char *)&(p[s->init_num]),n);
435 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
437 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */
440 memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
443 if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
445 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
446 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
450 is_export=SSL_C_IS_EXPORT(s->session->cipher);
452 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
454 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
455 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
459 if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
468 * The format of the CLIENT-MASTER-KEY message is
469 * 1 byte message type
471 * 2-byte clear key length (stored in s->s2->tmp.clear)
472 * 2-byte encrypted key length (stored in s->s2->tmp.enc)
473 * 2-byte key args length (IV etc)
478 * If the cipher is an export cipher, then the encrypted key bytes
479 * are a fixed portion of the total key (5 or 8 bytes). The size of
480 * this portion is in |ek|. If the cipher is not an export cipher,
481 * then the entire key material is encrypted (i.e., clear key length
484 if ((!is_export && s->s2->tmp.clear != 0) ||
485 (is_export && s->s2->tmp.clear + ek != EVP_CIPHER_key_length(c))) {
486 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
487 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_LENGTH);
491 * The encrypted blob must decrypt to the encrypted portion of the key.
492 * Decryption can't be expanding, so if we don't have enough encrypted
493 * bytes to fit the key in the buffer, stop now.
495 if ((is_export && s->s2->tmp.enc < ek) ||
496 (!is_export && s->s2->tmp.enc < EVP_CIPHER_key_length(c))) {
497 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
498 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_LENGTH_TOO_SHORT);
502 i = ssl_rsa_private_decrypt(s->cert, s->s2->tmp.enc,
503 &(p[s->s2->tmp.clear]),
504 &(p[s->s2->tmp.clear]),
505 (s->s2->ssl2_rollback) ? RSA_SSLV23_PADDING :
510 /* If a bad decrypt, continue with protocol but with a
511 * random master secret (Bleichenbacher attack) */
512 if ((i < 0) || ((!is_export && i != EVP_CIPHER_key_length(c))
513 || (is_export && i != ek))) {
518 i=EVP_CIPHER_key_length(c);
519 if (RAND_pseudo_bytes(&p[s->s2->tmp.clear], i) <= 0)
526 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
528 /* incorrect number of key bytes for non export cipher */
529 else if ((!is_export && (i != EVP_CIPHER_key_length(c)))
530 || (is_export && ((i != ek) || (s->s2->tmp.clear+i !=
531 EVP_CIPHER_key_length(c)))))
534 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
538 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
544 i = EVP_CIPHER_key_length(c);
546 if (i > SSL_MAX_MASTER_KEY_LENGTH)
548 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
549 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
552 s->session->master_key_length=i;
553 memcpy(s->session->master_key,p,(unsigned int)i);
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;
567 /* This is a bit of a hack to check for the correct packet
568 * type the first time round. */
569 if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
572 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
575 p=(unsigned char *)s->init_buf->data;
576 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)
585 if (p[-1] != SSL2_MT_ERROR)
587 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
588 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
591 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
595 if (i < s->version) s->version=i;
596 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
597 n2s(p,i); s->s2->tmp.session_id_length=i;
598 n2s(p,i); s->s2->challenge_length=i;
599 if ( (i < SSL2_MIN_CHALLENGE_LENGTH) ||
600 (i > SSL2_MAX_CHALLENGE_LENGTH))
602 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
603 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
606 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
609 /* SSL2_ST_GET_CLIENT_HELLO_C */
610 p=(unsigned char *)s->init_buf->data;
611 len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length;
612 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
614 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
615 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG);
618 n = (int)len - s->init_num;
619 i = ssl2_read(s,(char *)&(p[s->init_num]),n);
620 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
622 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */
625 /* get session-id before cipher stuff so we can get out session
626 * structure if it is cached */
628 if ((s->s2->tmp.session_id_length != 0) &&
629 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
631 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
632 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
636 if (s->s2->tmp.session_id_length == 0)
638 if (!ssl_get_new_session(s,1))
640 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
646 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
647 s->s2->tmp.session_id_length, NULL);
649 { /* previous session */
654 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
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))
668 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);
678 if (cs == NULL) goto mem_err;
680 cl=SSL_get_ciphers(s);
682 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
684 prio=sk_SSL_CIPHER_dup(cl);
685 if (prio == NULL) goto mem_err;
693 for (z=0; z<sk_SSL_CIPHER_num(prio); z++)
695 if (sk_SSL_CIPHER_find(allow,sk_SSL_CIPHER_value(prio,z)) < 0)
697 (void)sk_SSL_CIPHER_delete(prio,z);
701 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
703 sk_SSL_CIPHER_free(s->session->ciphers);
704 s->session->ciphers = prio;
706 /* s->session->ciphers should now have a list of
707 * ciphers that are on both the client and server.
708 * This list is ordered by the order the client sent
709 * the ciphers or in the order of the server's preference
710 * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
713 p+=s->s2->tmp.cipher_spec_length;
714 /* done cipher selection */
716 /* session id extracted already */
717 p+=s->s2->tmp.session_id_length;
720 if (s->s2->challenge_length > sizeof s->s2->challenge)
722 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
723 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
726 memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
729 SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
733 static int server_hello(SSL *s)
738 p=(unsigned char *)s->init_buf->data;
739 if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
742 *(p++)=SSL2_MT_SERVER_HELLO; /* type */
744 *(p++)=(unsigned char)hit;
748 if (s->session->sess_cert != NULL)
749 /* This can't really happen because get_client_hello
750 * has called ssl_get_new_session, which does not set
752 ssl_sess_cert_free(s->session->sess_cert);
753 s->session->sess_cert = ssl_sess_cert_new();
754 if (s->session->sess_cert == NULL)
756 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
760 /* If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
761 * depending on whether it survived in the internal cache
762 * or was retrieved from an external cache.
763 * If it is NULL, we cannot put any useful data in it anyway,
764 * so we don't touch it.
767 #else /* That's what used to be done when cert_st and sess_cert_st were
770 { /* else add cert to session */
771 CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
772 if (s->session->sess_cert != NULL)
773 ssl_cert_free(s->session->sess_cert);
774 s->session->sess_cert=s->cert;
776 else /* We have a session id-cache hit, if the
777 * session-id has no certificate listed against
778 * the 'cert' structure, grab the 'old' one
779 * listed against the SSL connection */
781 if (s->session->sess_cert == NULL)
783 CRYPTO_add(&s->cert->references,1,
784 CRYPTO_LOCK_SSL_CERT);
785 s->session->sess_cert=s->cert;
792 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
793 SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
799 *(p++)=0; /* no certificate type */
800 s2n(s->version,p); /* version */
801 s2n(0,p); /* cert len */
802 s2n(0,p); /* ciphers len */
807 /* put certificate type */
808 *(p++)=SSL2_CT_X509_CERTIFICATE;
809 s2n(s->version,p); /* version */
810 n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
811 s2n(n,p); /* certificate length */
812 i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
815 /* lets send out the ciphers we like in the
817 n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0);
819 s2n(n,p); /* add cipher length */
822 /* make and send conn_id */
823 s2n(SSL2_CONNECTION_ID_LENGTH,p); /* add conn_id length */
824 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
825 if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0)
827 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
828 d+=SSL2_CONNECTION_ID_LENGTH;
830 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
831 s->init_num=d-(unsigned char *)s->init_buf->data;
834 /* SSL2_ST_SEND_SERVER_HELLO_B */
835 /* If we are using TCP/IP, the performance is bad if we do 2
836 * writes without a read between them. This occurs when
837 * Session-id reuse is used, so I will put in a buffering module
841 if (!ssl_init_wbio_buffer(s,1)) return(-1);
844 return(ssl2_do_write(s));
847 static int get_client_finished(SSL *s)
853 p=(unsigned char *)s->init_buf->data;
854 if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
856 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
857 if (i < 1-s->init_num)
858 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
861 if (*p != SSL2_MT_CLIENT_FINISHED)
863 if (*p != SSL2_MT_ERROR)
865 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
866 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
870 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
871 /* try to read the error message */
872 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
873 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
877 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
880 /* SSL2_ST_GET_CLIENT_FINISHED_B */
881 if (s->s2->conn_id_length > sizeof s->s2->conn_id)
883 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
884 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
887 len = 1 + (unsigned long)s->s2->conn_id_length;
888 n = (int)len - s->init_num;
889 i = ssl2_read(s,(char *)&(p[s->init_num]),n);
892 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
895 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */
897 if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0)
899 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
900 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
906 static int server_verify(SSL *s)
910 if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
912 p=(unsigned char *)s->init_buf->data;
913 *(p++)=SSL2_MT_SERVER_VERIFY;
914 if (s->s2->challenge_length > sizeof s->s2->challenge)
916 SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
919 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
920 /* p+=s->s2->challenge_length; */
922 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
923 s->init_num=s->s2->challenge_length+1;
926 return(ssl2_do_write(s));
929 static int server_finish(SSL *s)
933 if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
935 p=(unsigned char *)s->init_buf->data;
936 *(p++)=SSL2_MT_SERVER_FINISHED;
938 if (s->session->session_id_length > sizeof s->session->session_id)
940 SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
943 memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length);
944 /* p+=s->session->session_id_length; */
946 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
947 s->init_num=s->session->session_id_length+1;
951 /* SSL2_ST_SEND_SERVER_FINISHED_B */
952 return(ssl2_do_write(s));
955 /* send the request and check the response */
956 static int request_certificate(SSL *s)
958 const unsigned char *cp;
959 unsigned char *p,*p2,*buf2;
961 int i,j,ctype,ret= -1;
964 STACK_OF(X509) *sk=NULL;
967 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
969 p=(unsigned char *)s->init_buf->data;
970 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
971 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
972 if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
974 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
976 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
977 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
981 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
991 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
994 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
996 p=(unsigned char *)s->init_buf->data;
997 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */
998 if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3
999 * (probably NO-CERTIFICATE-ERROR) */
1001 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
1006 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR))
1009 if (i != SSL2_PE_NO_CERTIFICATE)
1011 /* not the error message we expected -- let ssl2_part_read handle it */
1013 ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3);
1017 if (s->msg_callback)
1018 s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */
1020 /* this is the one place where we can recover from an SSL 2.0 error */
1022 if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
1024 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1025 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1031 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6))
1033 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
1034 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
1037 if (s->init_num != 6)
1039 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1043 /* ok we have a response */
1044 /* certificate type, there is only one right now. */
1046 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
1048 ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1049 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
1052 n2s(p,i); s->s2->tmp.clen=i;
1053 n2s(p,i); s->s2->tmp.rlen=i;
1054 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1057 /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1058 p=(unsigned char *)s->init_buf->data;
1059 len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1060 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
1062 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG);
1065 j = (int)len - s->init_num;
1066 i = ssl2_read(s,(char *)&(p[s->init_num]),j);
1069 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
1072 if (s->msg_callback)
1073 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */
1077 x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen);
1080 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
1084 if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
1086 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1090 i=ssl_verify_cert_chain(s,sk);
1092 if (i > 0) /* we like the packet, now check the chksum */
1095 EVP_PKEY *pkey=NULL;
1097 EVP_MD_CTX_init(&ctx);
1098 EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL);
1099 EVP_VerifyUpdate(&ctx,s->s2->key_material,
1100 s->s2->key_material_length);
1101 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
1103 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
1104 buf2=OPENSSL_malloc((unsigned int)i);
1107 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1111 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
1112 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
1115 pkey=X509_get_pubkey(x509);
1116 if (pkey == NULL) goto end;
1117 i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey);
1118 EVP_PKEY_free(pkey);
1119 EVP_MD_CTX_cleanup(&ctx);
1123 if (s->session->peer != NULL)
1124 X509_free(s->session->peer);
1125 s->session->peer=x509;
1126 CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
1127 s->session->verify_result = s->verify_result;
1133 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
1140 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1148 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1149 unsigned char *to, int padding)
1154 if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
1156 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
1159 if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
1161 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1164 rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1166 /* we have the public key */
1167 i=RSA_private_decrypt(len,from,to,rsa,padding);
1169 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
1172 #else /* !OPENSSL_NO_SSL2 */
1175 static void *dummy=&dummy;