Clarify CMS_decrypt behaviour.
[openssl.git] / ssl / s23_srvr.c
1 /* ssl/s23_srvr.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
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.
8  * 
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).
15  * 
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.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
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)"
40  * 
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
51  * SUCH DAMAGE.
52  * 
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.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2006 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
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
71  *    distribution.
72  *
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/)"
77  *
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.
82  *
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.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
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  * ====================================================================
105  *
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).
109  *
110  */
111
112 #include <stdio.h>
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>
118 #ifdef OPENSSL_FIPS
119 #include <openssl/fips.h>
120 #endif
121
122 static const SSL_METHOD *ssl23_get_server_method(int ver);
123 int ssl23_get_client_hello(SSL *s);
124 static const SSL_METHOD *ssl23_get_server_method(int ver)
125         {
126 #ifndef OPENSSL_NO_SSL2
127         if (ver == SSL2_VERSION)
128                 return(SSLv2_server_method());
129 #endif
130         if (ver == SSL3_VERSION)
131                 return(SSLv3_server_method());
132         else if (ver == TLS1_VERSION)
133                 return(TLSv1_server_method());
134         else if (ver == TLS1_1_VERSION)
135                 return(TLSv1_1_server_method());
136         else if (ver == TLS1_2_VERSION)
137                 return(TLSv1_2_server_method());
138         else
139                 return(NULL);
140         }
141
142 IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
143                         ssl23_accept,
144                         ssl_undefined_function,
145                         ssl23_get_server_method)
146
147 int ssl23_accept(SSL *s)
148         {
149         BUF_MEM *buf;
150         unsigned long Time=(unsigned long)time(NULL);
151         void (*cb)(const SSL *ssl,int type,int val)=NULL;
152         int ret= -1;
153         int new_state,state;
154
155         RAND_add(&Time,sizeof(Time),0);
156         ERR_clear_error();
157         clear_sys_error();
158
159         if (s->info_callback != NULL)
160                 cb=s->info_callback;
161         else if (s->ctx->info_callback != NULL)
162                 cb=s->ctx->info_callback;
163         
164         s->in_handshake++;
165         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
166
167         for (;;)
168                 {
169                 state=s->state;
170
171                 switch(s->state)
172                         {
173                 case SSL_ST_BEFORE:
174                 case SSL_ST_ACCEPT:
175                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
176                 case SSL_ST_OK|SSL_ST_ACCEPT:
177
178                         s->server=1;
179                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
180
181                         /* s->version=SSL3_VERSION; */
182                         s->type=SSL_ST_ACCEPT;
183
184                         if (s->init_buf == NULL)
185                                 {
186                                 if ((buf=BUF_MEM_new()) == NULL)
187                                         {
188                                         ret= -1;
189                                         goto end;
190                                         }
191                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
192                                         {
193                                         ret= -1;
194                                         goto end;
195                                         }
196                                 s->init_buf=buf;
197                                 }
198
199                         ssl3_init_finished_mac(s);
200
201                         s->state=SSL23_ST_SR_CLNT_HELLO_A;
202                         s->ctx->stats.sess_accept++;
203                         s->init_num=0;
204                         break;
205
206                 case SSL23_ST_SR_CLNT_HELLO_A:
207                 case SSL23_ST_SR_CLNT_HELLO_B:
208
209                         s->shutdown=0;
210                         ret=ssl23_get_client_hello(s);
211                         if (ret >= 0) cb=NULL;
212                         goto end;
213                         /* break; */
214
215                 default:
216                         SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
217                         ret= -1;
218                         goto end;
219                         /* break; */
220                         }
221
222                 if ((cb != NULL) && (s->state != state))
223                         {
224                         new_state=s->state;
225                         s->state=state;
226                         cb(s,SSL_CB_ACCEPT_LOOP,1);
227                         s->state=new_state;
228                         }
229                 }
230 end:
231         s->in_handshake--;
232         if (cb != NULL)
233                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
234         return(ret);
235         }
236
237
238 int ssl23_get_client_hello(SSL *s)
239         {
240         char buf_space[11]; /* Request this many bytes in initial read.
241                              * We can detect SSL 3.0/TLS 1.0 Client Hellos
242                              * ('type == 3') correctly only when the following
243                              * is in a single record, which is not guaranteed by
244                              * the protocol specification:
245                              * Byte  Content
246                              *  0     type            \
247                              *  1/2   version          > record header
248                              *  3/4   length          /
249                              *  5     msg_type        \
250                              *  6-8   length           > Client Hello message
251                              *  9/10  client_version  /
252                              */
253         char *buf= &(buf_space[0]);
254         unsigned char *p,*d,*d_len,*dd;
255         unsigned int i;
256         unsigned int csl,sil,cl;
257         int n=0,j;
258         int type=0;
259         int v[2];
260
261         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
262                 {
263                 /* read the initial header */
264                 v[0]=v[1]=0;
265
266                 if (!ssl3_setup_buffers(s)) goto err;
267
268                 n=ssl23_read_bytes(s, sizeof buf_space);
269                 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
270
271                 p=s->packet;
272
273                 memcpy(buf,p,n);
274
275                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
276                         {
277                         /*
278                          * SSLv2 header
279                          */
280                         if ((p[3] == 0x00) && (p[4] == 0x02))
281                                 {
282                                 v[0]=p[3]; v[1]=p[4];
283                                 /* SSLv2 */
284                                 if (!(s->options & SSL_OP_NO_SSLv2))
285                                         type=1;
286                                 }
287                         else if (p[3] == SSL3_VERSION_MAJOR)
288                                 {
289                                 v[0]=p[3]; v[1]=p[4];
290                                 /* SSLv3/TLSv1 */
291                                 if (p[4] >= TLS1_VERSION_MINOR)
292                                         {
293                                         if (p[4] >= TLS1_2_VERSION_MINOR &&
294                                            !(s->options & SSL_OP_NO_TLSv1_2))
295                                                 {
296                                                 s->version=TLS1_2_VERSION;
297                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
298                                                 }
299                                         else if (p[4] >= TLS1_1_VERSION_MINOR &&
300                                            !(s->options & SSL_OP_NO_TLSv1_1))
301                                                 {
302                                                 s->version=TLS1_1_VERSION;
303                                                 /* type=2; */ /* done later to survive restarts */
304                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
305                                                 }
306                                         else if (!(s->options & SSL_OP_NO_TLSv1))
307                                                 {
308                                                 s->version=TLS1_VERSION;
309                                                 /* type=2; */ /* done later to survive restarts */
310                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
311                                                 }
312                                         else if (!(s->options & SSL_OP_NO_SSLv3))
313                                                 {
314                                                 s->version=SSL3_VERSION;
315                                                 /* type=2; */
316                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
317                                                 }
318                                         else if (!(s->options & SSL_OP_NO_SSLv2))
319                                                 {
320                                                 type=1;
321                                                 }
322                                         }
323                                 else if (!(s->options & SSL_OP_NO_SSLv3))
324                                         {
325                                         s->version=SSL3_VERSION;
326                                         /* type=2; */
327                                         s->state=SSL23_ST_SR_CLNT_HELLO_B;
328                                         }
329                                 else if (!(s->options & SSL_OP_NO_SSLv2))
330                                         type=1;
331
332                                 }
333                         }
334                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
335                          (p[1] == SSL3_VERSION_MAJOR) &&
336                          (p[5] == SSL3_MT_CLIENT_HELLO) &&
337                          ((p[3] == 0 && p[4] < 5 /* silly record length? */)
338                                 || (p[9] >= p[1])))
339                         {
340                         /*
341                          * SSLv3 or tls1 header
342                          */
343                         
344                         v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
345                         /* We must look at client_version inside the Client Hello message
346                          * to get the correct minor version.
347                          * However if we have only a pathologically small fragment of the
348                          * Client Hello message, this would be difficult, and we'd have
349                          * to read more records to find out.
350                          * No known SSL 3.0 client fragments ClientHello like this,
351                          * so we simply assume TLS 1.0 to avoid protocol version downgrade
352                          * attacks. */
353                         if (p[3] == 0 && p[4] < 6)
354                                 {
355 #if 0
356                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
357                                 goto err;
358 #else
359                                 v[1] = TLS1_VERSION_MINOR;
360 #endif
361                                 }
362                         /* if major version number > 3 set minor to a value
363                          * which will use the highest version 3 we support.
364                          * If TLS 2.0 ever appears we will need to revise
365                          * this....
366                          */
367                         else if (p[9] > SSL3_VERSION_MAJOR)
368                                 v[1]=0xff;
369                         else
370                                 v[1]=p[10]; /* minor version according to client_version */
371                         if (v[1] >= TLS1_VERSION_MINOR)
372                                 {
373                                 if (v[1] >= TLS1_2_VERSION_MINOR &&
374                                         !(s->options & SSL_OP_NO_TLSv1_2))
375                                         {
376                                         s->version=TLS1_2_VERSION;
377                                         type=3;
378                                         }
379                                 else if (v[1] >= TLS1_1_VERSION_MINOR &&
380                                         !(s->options & SSL_OP_NO_TLSv1_1))
381                                         {
382                                         s->version=TLS1_1_VERSION;
383                                         type=3;
384                                         }
385                                 else if (!(s->options & SSL_OP_NO_TLSv1))
386                                         {
387                                         s->version=TLS1_VERSION;
388                                         type=3;
389                                         }
390                                 else if (!(s->options & SSL_OP_NO_SSLv3))
391                                         {
392                                         s->version=SSL3_VERSION;
393                                         type=3;
394                                         }
395                                 }
396                         else
397                                 {
398                                 /* client requests SSL 3.0 */
399                                 if (!(s->options & SSL_OP_NO_SSLv3))
400                                         {
401                                         s->version=SSL3_VERSION;
402                                         type=3;
403                                         }
404                                 else if (!(s->options & SSL_OP_NO_TLSv1))
405                                         {
406                                         /* we won't be able to use TLS of course,
407                                          * but this will send an appropriate alert */
408                                         s->version=TLS1_VERSION;
409                                         type=3;
410                                         }
411                                 }
412                         }
413                 else if ((strncmp("GET ", (char *)p,4) == 0) ||
414                          (strncmp("POST ",(char *)p,5) == 0) ||
415                          (strncmp("HEAD ",(char *)p,5) == 0) ||
416                          (strncmp("PUT ", (char *)p,4) == 0))
417                         {
418                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
419                         goto err;
420                         }
421                 else if (strncmp("CONNECT",(char *)p,7) == 0)
422                         {
423                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
424                         goto err;
425                         }
426                 }
427
428         if (s->version < TLS1_2_VERSION && tls1_suiteb(s))
429                 {
430                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
431                                 SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
432                 goto err;
433                 }
434
435 #ifdef OPENSSL_FIPS
436         if (FIPS_mode() && (s->version < TLS1_VERSION))
437                 {
438                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
439                                         SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
440                 goto err;
441                 }
442 #endif
443
444         if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL))
445                 {
446                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_VERSION_TOO_LOW);
447                 goto err;
448                 }
449
450         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
451                 {
452                 /* we have SSLv3/TLSv1 in an SSLv2 header
453                  * (other cases skip this state) */
454
455                 type=2;
456                 p=s->packet;
457                 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
458                 v[1] = p[4];
459
460                 n=((p[0]&0x7f)<<8)|p[1];
461                 if (n > (1024*4))
462                         {
463                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
464                         goto err;
465                         }
466
467                 j=ssl23_read_bytes(s,n+2);
468                 if (j <= 0) return(j);
469
470                 ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
471                 if (s->msg_callback)
472                         s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
473
474                 p=s->packet;
475                 p+=5;
476                 n2s(p,csl);
477                 n2s(p,sil);
478                 n2s(p,cl);
479                 d=(unsigned char *)s->init_buf->data;
480                 if ((csl+sil+cl+11) != s->packet_length) /* We can't have TLS extensions in SSL 2.0 format
481                                                           * Client Hello, can we? Error condition should be
482                                                           * '>' otherweise */
483                         {
484                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
485                         goto err;
486                         }
487
488                 /* record header: msg_type ... */
489                 *(d++) = SSL3_MT_CLIENT_HELLO;
490                 /* ... and length (actual value will be written later) */
491                 d_len = d;
492                 d += 3;
493
494                 /* client_version */
495                 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
496                 *(d++) = v[1];
497
498                 /* lets populate the random area */
499                 /* get the challenge_length */
500                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
501                 memset(d,0,SSL3_RANDOM_SIZE);
502                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
503                 d+=SSL3_RANDOM_SIZE;
504
505                 /* no session-id reuse */
506                 *(d++)=0;
507
508                 /* ciphers */
509                 j=0;
510                 dd=d;
511                 d+=2;
512                 for (i=0; i<csl; i+=3)
513                         {
514                         if (p[i] != 0) continue;
515                         *(d++)=p[i+1];
516                         *(d++)=p[i+2];
517                         j+=2;
518                         }
519                 s2n(j,dd);
520
521                 /* COMPRESSION */
522                 *(d++)=1;
523                 *(d++)=0;
524                 
525 #if 0
526                 /* copy any remaining data with may be extensions */
527                 p = p+csl+sil+cl;
528                 while (p <  s->packet+s->packet_length)
529                         {
530                         *(d++)=*(p++);
531                         }
532 #endif
533
534                 i = (d-(unsigned char *)s->init_buf->data) - 4;
535                 l2n3((long)i, d_len);
536
537                 /* get the data reused from the init_buf */
538                 s->s3->tmp.reuse_message=1;
539                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
540                 s->s3->tmp.message_size=i;
541                 }
542
543         /* imaginary new state (for program structure): */
544         /* s->state = SSL23_SR_CLNT_HELLO_C */
545
546         if (type == 1)
547                 {
548 #ifdef OPENSSL_NO_SSL2
549                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
550                 goto err;
551 #else
552                 /* we are talking sslv2 */
553                 /* we need to clean up the SSLv3/TLSv1 setup and put in the
554                  * sslv2 stuff. */
555
556                 if (s->s2 == NULL)
557                         {
558                         if (!ssl2_new(s))
559                                 goto err;
560                         }
561                 else
562                         ssl2_clear(s);
563
564                 if (s->s3 != NULL) ssl3_free(s);
565
566                 if (!BUF_MEM_grow_clean(s->init_buf,
567                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
568                         {
569                         goto err;
570                         }
571
572                 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
573                 if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3)
574                         s->s2->ssl2_rollback=0;
575                 else
576                         /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
577                          * (SSL 3.0 draft/RFC 2246, App. E.2) */
578                         s->s2->ssl2_rollback=1;
579
580                 /* setup the n bytes we have read so we get them from
581                  * the sslv2 buffer */
582                 s->rstate=SSL_ST_READ_HEADER;
583                 s->packet_length=n;
584                 s->packet= &(s->s2->rbuf[0]);
585                 memcpy(s->packet,buf,n);
586                 s->s2->rbuf_left=n;
587                 s->s2->rbuf_offs=0;
588
589                 s->method=SSLv2_server_method();
590                 s->handshake_func=s->method->ssl_accept;
591 #endif
592                 }
593
594         if ((type == 2) || (type == 3))
595                 {
596                 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
597
598                 if (!ssl_init_wbio_buffer(s,1)) goto err;
599
600                 /* we are in this state */
601                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
602
603                 if (type == 3)
604                         {
605                         /* put the 'n' bytes we have read into the input buffer
606                          * for SSLv3 */
607                         s->rstate=SSL_ST_READ_HEADER;
608                         s->packet_length=n;
609                         if (s->s3->rbuf.buf == NULL)
610                                 if (!ssl3_setup_read_buffer(s))
611                                         goto err;
612
613                         s->packet= &(s->s3->rbuf.buf[0]);
614                         memcpy(s->packet,buf,n);
615                         s->s3->rbuf.left=n;
616                         s->s3->rbuf.offset=0;
617                         }
618                 else
619                         {
620                         s->packet_length=0;
621                         s->s3->rbuf.left=0;
622                         s->s3->rbuf.offset=0;
623                         }
624                 if (s->version == TLS1_2_VERSION)
625                         s->method = TLSv1_2_server_method();
626                 else if (s->version == TLS1_1_VERSION)
627                         s->method = TLSv1_1_server_method();
628                 else if (s->version == TLS1_VERSION)
629                         s->method = TLSv1_server_method();
630                 else
631                         s->method = SSLv3_server_method();
632 #if 0 /* ssl3_get_client_hello does this */
633                 s->client_version=(v[0]<<8)|v[1];
634 #endif
635                 s->handshake_func=s->method->ssl_accept;
636                 }
637         
638         if ((type < 1) || (type > 3))
639                 {
640                 /* bad, very bad */
641                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
642                 goto err;
643                 }
644         s->init_num=0;
645
646         if (buf != buf_space) OPENSSL_free(buf);
647         return(SSL_accept(s));
648 err:
649         if (buf != buf_space) OPENSSL_free(buf);
650         return(-1);
651         }