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,
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;
191 if(s->init_buf == NULL)
193 if ((buf=BUF_MEM_new()) == NULL)
198 if (!BUF_MEM_grow(buf,(int) SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
207 s->ctx->stats.sess_accept++;
208 s->handshake_func=ssl2_accept;
209 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
212 case SSL2_ST_GET_CLIENT_HELLO_A:
213 case SSL2_ST_GET_CLIENT_HELLO_B:
214 case SSL2_ST_GET_CLIENT_HELLO_C:
216 ret=get_client_hello(s);
217 if (ret <= 0) goto end;
219 s->state=SSL2_ST_SEND_SERVER_HELLO_A;
222 case SSL2_ST_SEND_SERVER_HELLO_A:
223 case SSL2_ST_SEND_SERVER_HELLO_B:
225 if (ret <= 0) goto end;
229 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
234 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
237 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
238 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
239 ret=get_client_master_key(s);
240 if (ret <= 0) goto end;
242 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
245 case SSL2_ST_SERVER_START_ENCRYPTION:
246 /* Ok we how have sent all the stuff needed to
247 * start encrypting, the next packet back will
249 if (!ssl2_enc_init(s,0))
250 { ret= -1; goto end; }
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);
258 if (ret <= 0) goto end;
262 /* If we are in here, we have been
263 * buffering the output, so we need to
264 * flush it and remove buffering from
266 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
271 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
275 case SSL2_ST_SEND_SERVER_VERIFY_C:
276 /* get the number of bytes to write */
277 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
280 s->rwstate=SSL_WRITING;
281 num1=BIO_flush(s->wbio);
282 if (num1 <= 0) { ret= -1; goto end; }
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:
305 /* don't do a 'request certificate' if we
306 * don't want to, or we already have one, and
307 * we only want to do it once. */
308 if (!(s->verify_mode & SSL_VERIFY_PEER) ||
309 ((s->session->peer != NULL) &&
310 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
312 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
317 ret=request_certificate(s);
318 if (ret <= 0) goto end;
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);
327 if (ret <= 0) goto end;
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++;
345 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
351 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
357 if ((cb != NULL) && (s->state != state))
361 cb(s,SSL_CB_ACCEPT_LOOP,1);
368 cb(s,SSL_CB_ACCEPT_EXIT,ret);
372 static int get_client_master_key(SSL *s)
374 int is_export,i,n,keya,ek;
377 const SSL_CIPHER *cp;
381 p=(unsigned char *)s->init_buf->data;
382 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)
392 if (p[-1] != SSL2_MT_ERROR)
394 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
395 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
398 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
402 cp=ssl2_get_cipher_by_char(p);
405 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
406 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
409 s->session->cipher= cp;
412 n2s(p,i); s->s2->tmp.clear=i;
413 n2s(p,i); s->s2->tmp.enc=i;
415 if(i > SSL_MAX_KEY_ARG_LENGTH)
417 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
418 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
421 s->session->key_arg_length=i;
422 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
425 /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
426 p=(unsigned char *)s->init_buf->data;
427 if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
429 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
430 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
433 keya=s->session->key_arg_length;
434 len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + (unsigned long)keya;
435 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
437 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
438 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG);
441 n = (int)len - s->init_num;
442 i = ssl2_read(s,(char *)&(p[s->init_num]),n);
443 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
445 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */
448 memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
451 if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
453 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
454 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
458 is_export=SSL_C_IS_EXPORT(s->session->cipher);
460 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,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
467 if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
476 * The format of the CLIENT-MASTER-KEY message is
477 * 1 byte message type
479 * 2-byte clear key length (stored in s->s2->tmp.clear)
480 * 2-byte encrypted key length (stored in s->s2->tmp.enc)
481 * 2-byte key args length (IV etc)
486 * If the cipher is an export cipher, then the encrypted key bytes
487 * are a fixed portion of the total key (5 or 8 bytes). The size of
488 * this portion is in |ek|. If the cipher is not an export cipher,
489 * then the entire key material is encrypted (i.e., clear key length
492 if ((!is_export && s->s2->tmp.clear != 0) ||
493 (is_export && s->s2->tmp.clear + ek != EVP_CIPHER_key_length(c))) {
494 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
495 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_LENGTH);
499 * The encrypted blob must decrypt to the encrypted portion of the key.
500 * Decryption can't be expanding, so if we don't have enough encrypted
501 * bytes to fit the key in the buffer, stop now.
503 if ((is_export && s->s2->tmp.enc < ek) ||
504 (!is_export && s->s2->tmp.enc < EVP_CIPHER_key_length(c))) {
505 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
506 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_LENGTH_TOO_SHORT);
510 i = ssl_rsa_private_decrypt(s->cert, s->s2->tmp.enc,
511 &(p[s->s2->tmp.clear]),
512 &(p[s->s2->tmp.clear]),
513 (s->s2->ssl2_rollback) ? RSA_SSLV23_PADDING :
518 /* If a bad decrypt, continue with protocol but with a
519 * random master secret (Bleichenbacher attack) */
520 if ((i < 0) || ((!is_export && i != EVP_CIPHER_key_length(c))
521 || (is_export && i != ek))) {
526 i=EVP_CIPHER_key_length(c);
527 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)))))
542 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
546 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
552 i = EVP_CIPHER_key_length(c);
554 if (i > SSL_MAX_MASTER_KEY_LENGTH)
556 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
557 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
560 s->session->master_key_length=i;
561 memcpy(s->session->master_key,p,(unsigned int)i);
565 static int get_client_hello(SSL *s)
570 STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
571 STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
572 STACK_OF(SSL_CIPHER) *prio, *allow;
575 /* This is a bit of a hack to check for the correct packet
576 * type the first time round. */
577 if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
580 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
583 p=(unsigned char *)s->init_buf->data;
584 if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
586 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
587 if (i < (9-s->init_num))
588 return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
591 if (*(p++) != SSL2_MT_CLIENT_HELLO)
593 if (p[-1] != SSL2_MT_ERROR)
595 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
596 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
599 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
603 if (i < s->version) s->version=i;
604 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
605 n2s(p,i); s->s2->tmp.session_id_length=i;
606 n2s(p,i); s->s2->challenge_length=i;
607 if ( (i < SSL2_MIN_CHALLENGE_LENGTH) ||
608 (i > SSL2_MAX_CHALLENGE_LENGTH))
610 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
611 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
614 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
617 /* SSL2_ST_GET_CLIENT_HELLO_C */
618 p=(unsigned char *)s->init_buf->data;
619 len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length;
620 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
622 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
623 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG);
626 n = (int)len - s->init_num;
627 i = ssl2_read(s,(char *)&(p[s->init_num]),n);
628 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
630 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */
633 /* get session-id before cipher stuff so we can get out session
634 * structure if it is cached */
636 if ((s->s2->tmp.session_id_length != 0) &&
637 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
639 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
640 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
644 if (s->s2->tmp.session_id_length == 0)
646 if (!ssl_get_new_session(s,1))
648 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);
657 { /* previous session */
662 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
669 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
670 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
674 if (!ssl_get_new_session(s,1))
676 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
684 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
685 &s->session->ciphers);
686 if (cs == NULL) goto mem_err;
688 cl=SSL_get_ciphers(s);
690 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
692 prio=sk_SSL_CIPHER_dup(cl);
693 if (prio == NULL) goto mem_err;
701 for (z=0; z<sk_SSL_CIPHER_num(prio); z++)
703 if (sk_SSL_CIPHER_find(allow,sk_SSL_CIPHER_value(prio,z)) < 0)
705 (void)sk_SSL_CIPHER_delete(prio,z);
709 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
711 sk_SSL_CIPHER_free(s->session->ciphers);
712 s->session->ciphers = prio;
714 /* s->session->ciphers should now have a list of
715 * ciphers that are on both the client and server.
716 * This list is ordered by the order the client sent
717 * the ciphers or in the order of the server's preference
718 * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
721 p+=s->s2->tmp.cipher_spec_length;
722 /* done cipher selection */
724 /* session id extracted already */
725 p+=s->s2->tmp.session_id_length;
728 if (s->s2->challenge_length > sizeof s->s2->challenge)
730 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
731 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
734 memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
737 SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
741 static int server_hello(SSL *s)
746 p=(unsigned char *)s->init_buf->data;
747 if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
750 *(p++)=SSL2_MT_SERVER_HELLO; /* type */
752 *(p++)=(unsigned char)hit;
756 if (s->session->sess_cert != NULL)
757 /* This can't really happen because get_client_hello
758 * has called ssl_get_new_session, which does not set
760 ssl_sess_cert_free(s->session->sess_cert);
761 s->session->sess_cert = ssl_sess_cert_new();
762 if (s->session->sess_cert == NULL)
764 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
768 /* If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
769 * depending on whether it survived in the internal cache
770 * or was retrieved from an external cache.
771 * If it is NULL, we cannot put any useful data in it anyway,
772 * so we don't touch it.
775 #else /* That's what used to be done when cert_st and sess_cert_st were
778 { /* else add cert to session */
779 CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
780 if (s->session->sess_cert != NULL)
781 ssl_cert_free(s->session->sess_cert);
782 s->session->sess_cert=s->cert;
784 else /* We have a session id-cache hit, if the
785 * session-id has no certificate listed against
786 * the 'cert' structure, grab the 'old' one
787 * listed against the SSL connection */
789 if (s->session->sess_cert == NULL)
791 CRYPTO_add(&s->cert->references,1,
792 CRYPTO_LOCK_SSL_CERT);
793 s->session->sess_cert=s->cert;
800 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
801 SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
807 *(p++)=0; /* no certificate type */
808 s2n(s->version,p); /* version */
809 s2n(0,p); /* cert len */
810 s2n(0,p); /* ciphers len */
815 /* put certificate type */
816 *(p++)=SSL2_CT_X509_CERTIFICATE;
817 s2n(s->version,p); /* version */
818 n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
819 s2n(n,p); /* certificate length */
820 i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
823 /* lets send out the ciphers we like in the
825 n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0);
827 s2n(n,p); /* add cipher length */
830 /* make and send conn_id */
831 s2n(SSL2_CONNECTION_ID_LENGTH,p); /* add conn_id length */
832 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
833 if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0)
835 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
836 d+=SSL2_CONNECTION_ID_LENGTH;
838 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
839 s->init_num=d-(unsigned char *)s->init_buf->data;
842 /* SSL2_ST_SEND_SERVER_HELLO_B */
843 /* If we are using TCP/IP, the performance is bad if we do 2
844 * writes without a read between them. This occurs when
845 * Session-id reuse is used, so I will put in a buffering module
849 if (!ssl_init_wbio_buffer(s,1)) return(-1);
852 return(ssl2_do_write(s));
855 static int get_client_finished(SSL *s)
861 p=(unsigned char *)s->init_buf->data;
862 if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
864 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
865 if (i < 1-s->init_num)
866 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
869 if (*p != SSL2_MT_CLIENT_FINISHED)
871 if (*p != SSL2_MT_ERROR)
873 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
874 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
878 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
879 /* try to read the error message */
880 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
881 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
885 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
888 /* SSL2_ST_GET_CLIENT_FINISHED_B */
889 if (s->s2->conn_id_length > sizeof s->s2->conn_id)
891 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
892 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
895 len = 1 + (unsigned long)s->s2->conn_id_length;
896 n = (int)len - s->init_num;
897 i = ssl2_read(s,(char *)&(p[s->init_num]),n);
900 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
903 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */
905 if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0)
907 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
908 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
914 static int server_verify(SSL *s)
918 if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
920 p=(unsigned char *)s->init_buf->data;
921 *(p++)=SSL2_MT_SERVER_VERIFY;
922 if (s->s2->challenge_length > sizeof s->s2->challenge)
924 SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
927 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
928 /* p+=s->s2->challenge_length; */
930 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
931 s->init_num=s->s2->challenge_length+1;
934 return(ssl2_do_write(s));
937 static int server_finish(SSL *s)
941 if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
943 p=(unsigned char *)s->init_buf->data;
944 *(p++)=SSL2_MT_SERVER_FINISHED;
946 if (s->session->session_id_length > sizeof s->session->session_id)
948 SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
951 memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length);
952 /* p+=s->session->session_id_length; */
954 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
955 s->init_num=s->session->session_id_length+1;
959 /* SSL2_ST_SEND_SERVER_FINISHED_B */
960 return(ssl2_do_write(s));
963 /* send the request and check the response */
964 static int request_certificate(SSL *s)
966 const unsigned char *cp;
967 unsigned char *p,*p2,*buf2;
969 int i,j,ctype,ret= -1;
972 STACK_OF(X509) *sk=NULL;
975 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
977 p=(unsigned char *)s->init_buf->data;
978 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
979 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
980 if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
982 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
984 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
985 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
989 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
999 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
1002 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
1004 p=(unsigned char *)s->init_buf->data;
1005 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */
1006 if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3
1007 * (probably NO-CERTIFICATE-ERROR) */
1009 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
1014 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR))
1017 if (i != SSL2_PE_NO_CERTIFICATE)
1019 /* not the error message we expected -- let ssl2_part_read handle it */
1021 ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3);
1025 if (s->msg_callback)
1026 s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */
1028 /* this is the one place where we can recover from an SSL 2.0 error */
1030 if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
1032 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1033 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1039 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6))
1041 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
1042 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
1045 if (s->init_num != 6)
1047 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1051 /* ok we have a response */
1052 /* certificate type, there is only one right now. */
1054 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
1056 ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1057 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
1060 n2s(p,i); s->s2->tmp.clen=i;
1061 n2s(p,i); s->s2->tmp.rlen=i;
1062 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1065 /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1066 p=(unsigned char *)s->init_buf->data;
1067 len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1068 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
1070 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG);
1073 j = (int)len - s->init_num;
1074 i = ssl2_read(s,(char *)&(p[s->init_num]),j);
1077 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
1080 if (s->msg_callback)
1081 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */
1085 x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen);
1088 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
1092 if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
1094 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1098 i=ssl_verify_cert_chain(s,sk);
1100 if (i > 0) /* we like the packet, now check the chksum */
1103 EVP_PKEY *pkey=NULL;
1105 EVP_MD_CTX_init(&ctx);
1106 if (!EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL)
1107 || !EVP_VerifyUpdate(&ctx,s->s2->key_material,
1108 s->s2->key_material_length)
1109 || !EVP_VerifyUpdate(&ctx,ccd,
1110 SSL2_MIN_CERT_CHALLENGE_LENGTH))
1113 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
1114 buf2=OPENSSL_malloc((unsigned int)i);
1117 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1121 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
1122 if (!EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i))
1129 pkey=X509_get_pubkey(x509);
1130 if (pkey == NULL) goto end;
1131 i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey);
1132 EVP_PKEY_free(pkey);
1133 EVP_MD_CTX_cleanup(&ctx);
1137 if (s->session->peer != NULL)
1138 X509_free(s->session->peer);
1139 s->session->peer=x509;
1140 CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
1141 s->session->verify_result = s->verify_result;
1147 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
1154 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1162 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1163 unsigned char *to, int padding)
1168 if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
1170 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
1173 if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
1175 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1178 rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1180 /* we have the public key */
1181 i=RSA_private_decrypt(len,from,to,rsa,padding);
1183 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
1186 #else /* !OPENSSL_NO_SSL2 */
1189 static void *dummy=&dummy;