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) 1998-2006 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).
113 #include "ssl_locl.h"
114 #include <openssl/buffer.h>
115 #include <openssl/rand.h>
116 #include <openssl/objects.h>
117 #include <openssl/evp.h>
119 static const SSL_METHOD *ssl23_get_client_method(int ver);
120 static int ssl23_client_hello(SSL *s);
121 static int ssl23_get_server_hello(SSL *s);
122 static const SSL_METHOD *ssl23_get_client_method(int ver)
124 #ifndef OPENSSL_NO_SSL2
125 if (ver == SSL2_VERSION)
126 return(SSLv2_client_method());
128 if (ver == SSL3_VERSION)
129 return(SSLv3_client_method());
130 else if (ver == TLS1_VERSION)
131 return(TLSv1_client_method());
132 else if (ver == TLS1_1_VERSION)
133 return(TLSv1_1_client_method());
134 else if (ver == TLS1_2_VERSION)
135 return(TLSv1_2_client_method());
140 IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
141 ssl_undefined_function,
143 ssl23_get_client_method)
145 int ssl23_connect(SSL *s)
148 unsigned long Time=(unsigned long)time(NULL);
149 void (*cb)(const SSL *ssl,int type,int val)=NULL;
153 RAND_add(&Time,sizeof(Time),0);
157 if (s->info_callback != NULL)
159 else if (s->ctx->info_callback != NULL)
160 cb=s->ctx->info_callback;
163 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
173 case SSL_ST_BEFORE|SSL_ST_CONNECT:
174 case SSL_ST_OK|SSL_ST_CONNECT:
176 if (s->session != NULL)
178 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
183 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
185 /* s->version=TLS1_VERSION; */
186 s->type=SSL_ST_CONNECT;
188 if (s->init_buf == NULL)
190 if ((buf=BUF_MEM_new()) == NULL)
195 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
204 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
206 ssl3_init_finished_mac(s);
208 s->state=SSL23_ST_CW_CLNT_HELLO_A;
209 s->ctx->stats.sess_connect++;
213 case SSL23_ST_CW_CLNT_HELLO_A:
214 case SSL23_ST_CW_CLNT_HELLO_B:
217 ret=ssl23_client_hello(s);
218 if (ret <= 0) goto end;
219 s->state=SSL23_ST_CR_SRVR_HELLO_A;
224 case SSL23_ST_CR_SRVR_HELLO_A:
225 case SSL23_ST_CR_SRVR_HELLO_B:
226 ret=ssl23_get_server_hello(s);
227 if (ret >= 0) cb=NULL;
232 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
238 if (s->debug) { (void)BIO_flush(s->wbio); }
240 if ((cb != NULL) && (s->state != state))
244 cb(s,SSL_CB_CONNECT_LOOP,1);
253 cb(s,SSL_CB_CONNECT_EXIT,ret);
257 static int ssl23_no_ssl2_ciphers(SSL *s)
260 STACK_OF(SSL_CIPHER) *ciphers;
262 ciphers = SSL_get_ciphers(s);
263 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++)
265 cipher = sk_SSL_CIPHER_value(ciphers, i);
266 if (cipher->algorithm_ssl == SSL_SSLV2)
272 /* Fill a ClientRandom or ServerRandom field of length len. Returns <= 0
273 * on failure, 1 on success. */
274 int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len)
280 send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0;
282 send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0;
285 unsigned long Time = time(NULL);
286 unsigned char *p = result;
288 return RAND_pseudo_bytes(p, len-4);
291 return RAND_pseudo_bytes(result, len);
294 static int ssl23_client_hello(SSL *s)
301 int version = 0, version_major, version_minor;
302 #ifndef OPENSSL_NO_COMP
307 unsigned long mask, options = s->options;
309 ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1;
311 if (ssl2_compat && ssl23_no_ssl2_ciphers(s))
315 * SSL_OP_NO_X disables all protocols above X *if* there are
316 * some protocols below X enabled. This is required in order
317 * to maintain "version capability" vector contiguous. So
318 * that if application wants to disable TLS1.0 in favour of
319 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the
320 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2.
322 mask = SSL_OP_NO_TLSv1_1|SSL_OP_NO_TLSv1
323 #if !defined(OPENSSL_NO_SSL3)
326 #if !defined(OPENSSL_NO_SSL2)
327 |(ssl2_compat?SSL_OP_NO_SSLv2:0)
330 #if !defined(OPENSSL_NO_TLS1_2_CLIENT)
331 version = TLS1_2_VERSION;
333 if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask)
334 version = TLS1_1_VERSION;
336 version = TLS1_1_VERSION;
338 mask &= ~SSL_OP_NO_TLSv1_1;
339 if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
340 version = TLS1_VERSION;
341 mask &= ~SSL_OP_NO_TLSv1;
342 #if !defined(OPENSSL_NO_SSL3)
343 if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
344 version = SSL3_VERSION;
345 mask &= ~SSL_OP_NO_SSLv3;
347 #if !defined(OPENSSL_NO_SSL2)
348 if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask)
349 version = SSL2_VERSION;
352 #ifndef OPENSSL_NO_TLSEXT
353 if (version != SSL2_VERSION)
355 /* have to disable SSL 2.0 compatibility if we need TLS extensions */
357 if (s->tlsext_hostname != NULL)
359 if (s->tlsext_status_type != -1)
361 #ifdef TLSEXT_TYPE_opaque_prf_input
362 if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL)
368 buf=(unsigned char *)s->init_buf->data;
369 if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
372 /* don't reuse session-id's */
373 if (!ssl_get_new_session(s,0))
379 p=s->s3->client_random;
380 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
383 if (version == TLS1_2_VERSION)
385 version_major = TLS1_2_VERSION_MAJOR;
386 version_minor = TLS1_2_VERSION_MINOR;
388 else if (version == TLS1_1_VERSION)
390 version_major = TLS1_1_VERSION_MAJOR;
391 version_minor = TLS1_1_VERSION_MINOR;
393 else if (version == TLS1_VERSION)
395 version_major = TLS1_VERSION_MAJOR;
396 version_minor = TLS1_VERSION_MINOR;
401 SSLerr(SSL_F_SSL23_CLIENT_HELLO,
402 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
406 else if (version == SSL3_VERSION)
408 version_major = SSL3_VERSION_MAJOR;
409 version_minor = SSL3_VERSION_MINOR;
411 else if (version == SSL2_VERSION)
413 version_major = SSL2_VERSION_MAJOR;
414 version_minor = SSL2_VERSION_MINOR;
418 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
422 s->client_version = version;
426 /* create SSL 2.0 compatible Client Hello */
428 /* two byte record header will be written last */
430 p = d + 9; /* leave space for message type, version, individual length fields */
432 *(d++) = SSL2_MT_CLIENT_HELLO;
433 *(d++) = version_major;
434 *(d++) = version_minor;
436 /* Ciphers supported */
437 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
441 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
447 /* put in the session-id length (zero since there is no reuse) */
449 s->session->session_id_length=0;
453 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
454 ch_len=SSL2_CHALLENGE_LENGTH;
456 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
458 /* write out sslv2 challenge */
459 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32),
460 because it is one of SSL2_MAX_CHALLENGE_LENGTH (32)
461 or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the
462 check in for futurproofing */
463 if (SSL3_RANDOM_SIZE < ch_len)
468 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
469 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
472 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
476 buf[0]=((i>>8)&0xff)|0x80;
479 /* number of bytes to write */
483 ssl3_finish_mac(s,&(buf[2]),i);
487 /* create Client Hello in SSL 3.0/TLS 1.0 format */
489 /* do the record header (5 bytes) and handshake message header (4 bytes) last */
492 *(p++) = version_major;
493 *(p++) = version_minor;
496 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
497 p += SSL3_RANDOM_SIZE;
499 /* Session ID (zero since there is no reuse) */
502 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
503 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
506 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
509 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
510 /* Some servers hang if client hello > 256 bytes
511 * as hack workaround chop number of supported ciphers
512 * to keep it well below this if we use TLS v1.2
514 if (TLS1_get_version(s) >= TLS1_2_VERSION
515 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
516 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
522 #ifdef OPENSSL_NO_COMP
525 if ((s->options & SSL_OP_NO_COMPRESSION)
526 || !s->ctx->comp_methods)
529 j=sk_SSL_COMP_num(s->ctx->comp_methods);
533 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
537 *(p++)=0; /* Add the NULL method */
539 #ifndef OPENSSL_NO_TLSEXT
541 if (ssl_prepare_clienthello_tlsext(s) <= 0)
543 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
546 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
548 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
555 /* fill in 4-byte handshake header */
557 *(d++)=SSL3_MT_CLIENT_HELLO;
562 if (l > SSL3_RT_MAX_PLAIN_LENGTH)
564 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
568 /* fill in 5-byte record header */
570 *(d++) = SSL3_RT_HANDSHAKE;
571 *(d++) = version_major;
572 /* Some servers hang if we use long client hellos
573 * and a record number > TLS 1.0.
575 if (TLS1_get_client_version(s) > TLS1_VERSION)
578 *(d++) = version_minor;
581 /* number of bytes to write */
585 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
588 s->state=SSL23_ST_CW_CLNT_HELLO_B;
592 /* SSL3_ST_CW_CLNT_HELLO_B */
593 ret = ssl23_write_bytes(s);
595 if ((ret >= 2) && s->msg_callback)
597 /* Client Hello has been sent; tell msg_callback */
600 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
602 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
608 static int ssl23_get_server_hello(SSL *s)
615 n=ssl23_read_bytes(s,7);
617 if (n != 7) return(n);
622 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
623 (p[5] == 0x00) && (p[6] == 0x02))
625 #ifdef OPENSSL_NO_SSL2
626 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
629 /* we are talking sslv2 */
630 /* we need to clean up the SSLv3 setup and put in the
634 if (s->options & SSL_OP_NO_SSLv2)
636 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
647 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
648 ch_len=SSL2_CHALLENGE_LENGTH;
650 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
652 /* write out sslv2 challenge */
653 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because
654 it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or
655 SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for
657 i=(SSL3_RANDOM_SIZE < ch_len)
658 ?SSL3_RANDOM_SIZE:ch_len;
659 s->s2->challenge_length=i;
660 memcpy(s->s2->challenge,
661 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
663 if (s->s3 != NULL) ssl3_free(s);
665 if (!BUF_MEM_grow_clean(s->init_buf,
666 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
668 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
672 s->state=SSL2_ST_GET_SERVER_HELLO_A;
673 if (!(s->client_version == SSL2_VERSION))
674 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
675 s->s2->ssl2_rollback=1;
677 /* setup the 7 bytes we have read so we get them from
678 * the sslv2 buffer */
679 s->rstate=SSL_ST_READ_HEADER;
681 s->packet= &(s->s2->rbuf[0]);
682 memcpy(s->packet,buf,n);
686 /* we have already written one */
687 s->s2->write_sequence=1;
689 s->method=SSLv2_client_method();
690 s->handshake_func=s->method->ssl_connect;
693 else if (p[1] == SSL3_VERSION_MAJOR &&
694 p[2] <= TLS1_2_VERSION_MINOR &&
695 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
696 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2)))
698 /* we have sslv3 or tls1 (server hello or alert) */
700 if ((p[2] == SSL3_VERSION_MINOR) &&
701 !(s->options & SSL_OP_NO_SSLv3))
706 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
707 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
711 s->version=SSL3_VERSION;
712 s->method=SSLv3_client_method();
714 else if ((p[2] == TLS1_VERSION_MINOR) &&
715 !(s->options & SSL_OP_NO_TLSv1))
717 s->version=TLS1_VERSION;
718 s->method=TLSv1_client_method();
720 else if ((p[2] == TLS1_1_VERSION_MINOR) &&
721 !(s->options & SSL_OP_NO_TLSv1_1))
723 s->version=TLS1_1_VERSION;
724 s->method=TLSv1_1_client_method();
726 else if ((p[2] == TLS1_2_VERSION_MINOR) &&
727 !(s->options & SSL_OP_NO_TLSv1_2))
729 s->version=TLS1_2_VERSION;
730 s->method=TLSv1_2_client_method();
734 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
738 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING)
742 void (*cb)(const SSL *ssl,int type,int val)=NULL;
745 if (s->info_callback != NULL)
747 else if (s->ctx->info_callback != NULL)
748 cb=s->ctx->info_callback;
754 cb(s,SSL_CB_READ_ALERT,j);
758 s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg);
760 s->rwstate=SSL_NOTHING;
761 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
765 if (!ssl_init_wbio_buffer(s,1)) goto err;
767 /* we are in this state */
768 s->state=SSL3_ST_CR_SRVR_HELLO_A;
770 /* put the 7 bytes we have read into the input buffer
772 s->rstate=SSL_ST_READ_HEADER;
774 if (s->s3->rbuf.buf == NULL)
775 if (!ssl3_setup_read_buffer(s))
777 s->packet= &(s->s3->rbuf.buf[0]);
778 memcpy(s->packet,buf,n);
780 s->s3->rbuf.offset=0;
782 s->handshake_func=s->method->ssl_connect;
786 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
791 /* Since, if we are sending a ssl23 client hello, we are not
792 * reusing a session-id */
793 if (!ssl_get_new_session(s,0))
796 return(SSL_connect(s));