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authorcvs2svn <admin@example.com>2015-03-08 16:48:48 +0000
committercvs2svn <admin@example.com>2015-03-08 16:48:48 +0000
commitda1a9ad3a4a867ba6569c05e6fca66d7f296c553 (patch)
tree44872802e872bdfd60730fa9cf01d9d5751251c1 /src/lib/libssl/s23_srvr.c
parent973703db67a8e73d70e63afa8f2cde19da09144d (diff)
downloadopenbsd-OPENBSD_5_7_BASE.tar.gz
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This commit was manufactured by cvs2git to create tag 'OPENBSD_5_7_BASE'.OPENBSD_5_7_BASE
Diffstat (limited to 'src/lib/libssl/s23_srvr.c')
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diff --git a/src/lib/libssl/s23_srvr.c b/src/lib/libssl/s23_srvr.c
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1/* $OpenBSD: s23_srvr.c,v 1.38 2015/02/06 08:30:23 jsing Exp $ */
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
114#include "ssl_locl.h"
115
116#include <openssl/buffer.h>
117#include <openssl/evp.h>
118#include <openssl/objects.h>
119
120static const SSL_METHOD *ssl23_get_server_method(int ver);
121int ssl23_get_client_hello(SSL *s);
122
123const SSL_METHOD SSLv23_server_method_data = {
124 .version = TLS1_2_VERSION,
125 .ssl_new = tls1_new,
126 .ssl_clear = tls1_clear,
127 .ssl_free = tls1_free,
128 .ssl_accept = ssl23_accept,
129 .ssl_connect = ssl_undefined_function,
130 .ssl_read = ssl23_read,
131 .ssl_peek = ssl23_peek,
132 .ssl_write = ssl23_write,
133 .ssl_shutdown = ssl_undefined_function,
134 .ssl_renegotiate = ssl_undefined_function,
135 .ssl_renegotiate_check = ssl_ok,
136 .ssl_get_message = ssl3_get_message,
137 .ssl_read_bytes = ssl3_read_bytes,
138 .ssl_write_bytes = ssl3_write_bytes,
139 .ssl_dispatch_alert = ssl3_dispatch_alert,
140 .ssl_ctrl = ssl3_ctrl,
141 .ssl_ctx_ctrl = ssl3_ctx_ctrl,
142 .get_cipher_by_char = ssl3_get_cipher_by_char,
143 .put_cipher_by_char = ssl3_put_cipher_by_char,
144 .ssl_pending = ssl_undefined_const_function,
145 .num_ciphers = ssl3_num_ciphers,
146 .get_cipher = ssl3_get_cipher,
147 .get_ssl_method = ssl23_get_server_method,
148 .get_timeout = ssl23_default_timeout,
149 .ssl3_enc = &ssl3_undef_enc_method,
150 .ssl_version = ssl_undefined_void_function,
151 .ssl_callback_ctrl = ssl3_callback_ctrl,
152 .ssl_ctx_callback_ctrl = ssl3_ctx_callback_ctrl,
153};
154
155const SSL_METHOD *
156SSLv23_server_method(void)
157{
158 return &SSLv23_server_method_data;
159}
160
161static const SSL_METHOD *
162ssl23_get_server_method(int ver)
163{
164 if (ver == SSL3_VERSION)
165 return (SSLv3_server_method());
166 if (ver == TLS1_VERSION)
167 return (TLSv1_server_method());
168 if (ver == TLS1_1_VERSION)
169 return (TLSv1_1_server_method());
170 if (ver == TLS1_2_VERSION)
171 return (TLSv1_2_server_method());
172 return (NULL);
173}
174
175int
176ssl23_accept(SSL *s)
177{
178 void (*cb)(const SSL *ssl, int type, int val) = NULL;
179 int ret = -1;
180 int new_state, state;
181
182 ERR_clear_error();
183 errno = 0;
184
185 if (s->info_callback != NULL)
186 cb = s->info_callback;
187 else if (s->ctx->info_callback != NULL)
188 cb = s->ctx->info_callback;
189
190 s->in_handshake++;
191 if (!SSL_in_init(s) || SSL_in_before(s))
192 SSL_clear(s);
193
194 for (;;) {
195 state = s->state;
196
197 switch (s->state) {
198 case SSL_ST_BEFORE:
199 case SSL_ST_ACCEPT:
200 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
201 case SSL_ST_OK|SSL_ST_ACCEPT:
202
203 s->server = 1;
204 if (cb != NULL)
205 cb(s, SSL_CB_HANDSHAKE_START, 1);
206
207 /* s->version=SSL3_VERSION; */
208 s->type = SSL_ST_ACCEPT;
209
210 if (s->init_buf == NULL) {
211 BUF_MEM *buf;
212 if ((buf = BUF_MEM_new()) == NULL) {
213 ret = -1;
214 goto end;
215 }
216 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
217 BUF_MEM_free(buf);
218 ret = -1;
219 goto end;
220 }
221 s->init_buf = buf;
222 }
223
224 if (!ssl3_init_finished_mac(s)) {
225 ret = -1;
226 goto end;
227 }
228
229 s->state = SSL23_ST_SR_CLNT_HELLO_A;
230 s->ctx->stats.sess_accept++;
231 s->init_num = 0;
232 break;
233
234 case SSL23_ST_SR_CLNT_HELLO_A:
235 case SSL23_ST_SR_CLNT_HELLO_B:
236
237 s->shutdown = 0;
238 ret = ssl23_get_client_hello(s);
239 if (ret >= 0)
240 cb = NULL;
241 goto end;
242 /* break; */
243
244 default:
245 SSLerr(SSL_F_SSL23_ACCEPT, SSL_R_UNKNOWN_STATE);
246 ret = -1;
247 goto end;
248 /* break; */
249 }
250
251 if ((cb != NULL) && (s->state != state)) {
252 new_state = s->state;
253 s->state = state;
254 cb(s, SSL_CB_ACCEPT_LOOP, 1);
255 s->state = new_state;
256 }
257 }
258end:
259 s->in_handshake--;
260 if (cb != NULL)
261 cb(s, SSL_CB_ACCEPT_EXIT, ret);
262 return (ret);
263}
264
265
266int
267ssl23_get_client_hello(SSL *s)
268{
269 char buf[11];
270 /*
271 * sizeof(buf) == 11, because we'll need to request this many bytes in
272 * the initial read.
273 * We can detect SSL 3.0/TLS 1.0 Client Hellos ('type == 3') correctly
274 * only when the following is in a single record, which is not
275 * guaranteed by the protocol specification:
276 * Byte Content
277 * 0 type \
278 * 1/2 version > record header
279 * 3/4 length /
280 * 5 msg_type \
281 * 6-8 length > Client Hello message
282 * 9/10 client_version /
283 */
284 unsigned char *p, *d, *d_len, *dd;
285 unsigned int i;
286 unsigned int csl, sil, cl;
287 int n = 0, j;
288 int type = 0;
289 int v[2];
290
291 if (s->state == SSL23_ST_SR_CLNT_HELLO_A) {
292 /* read the initial header */
293 v[0] = v[1] = 0;
294
295 if (!ssl3_setup_buffers(s))
296 return -1;
297
298 n = ssl23_read_bytes(s, sizeof buf);
299 if (n != sizeof buf)
300 return(n);
301
302 p = s->packet;
303
304 memcpy(buf, p, n);
305
306 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) {
307 /*
308 * SSLv2 header
309 */
310 if ((p[3] == 0x00) && (p[4] == 0x02)) {
311 v[0] = p[3];
312 v[1] = p[4];
313 /* SSLv2 */
314 if (!(s->options & SSL_OP_NO_SSLv2))
315 type = 1;
316 } else if (p[3] == SSL3_VERSION_MAJOR) {
317 v[0] = p[3];
318 v[1] = p[4];
319 /* SSLv3/TLSv1 */
320 if (p[4] >= TLS1_VERSION_MINOR) {
321 if (p[4] >= TLS1_2_VERSION_MINOR &&
322 !(s->options & SSL_OP_NO_TLSv1_2)) {
323 s->version = TLS1_2_VERSION;
324 s->state = SSL23_ST_SR_CLNT_HELLO_B;
325 } else if (p[4] >= TLS1_1_VERSION_MINOR &&
326 !(s->options & SSL_OP_NO_TLSv1_1)) {
327 s->version = TLS1_1_VERSION;
328 /* type=2; */ /* done later to survive restarts */
329 s->state = SSL23_ST_SR_CLNT_HELLO_B;
330 } else if (!(s->options & SSL_OP_NO_TLSv1)) {
331 s->version = TLS1_VERSION;
332 /* type=2; */ /* done later to survive restarts */
333 s->state = SSL23_ST_SR_CLNT_HELLO_B;
334 } else if (!(s->options & SSL_OP_NO_SSLv3)) {
335 s->version = SSL3_VERSION;
336 /* type=2; */
337 s->state = SSL23_ST_SR_CLNT_HELLO_B;
338 } else if (!(s->options & SSL_OP_NO_SSLv2)) {
339 type = 1;
340 }
341 } else if (!(s->options & SSL_OP_NO_SSLv3)) {
342 s->version = SSL3_VERSION;
343 /* type=2; */
344 s->state = SSL23_ST_SR_CLNT_HELLO_B;
345 } else if (!(s->options & SSL_OP_NO_SSLv2))
346 type = 1;
347
348 }
349 } else if ((p[0] == SSL3_RT_HANDSHAKE) &&
350 (p[1] == SSL3_VERSION_MAJOR) &&
351 (p[5] == SSL3_MT_CLIENT_HELLO) &&
352 ((p[3] == 0 && p[4] < 5 /* silly record length? */) ||
353 (p[9] >= p[1]))) {
354 /*
355 * SSLv3 or tls1 header
356 */
357
358 v[0] = p[1]; /* major version (= SSL3_VERSION_MAJOR) */
359 /* We must look at client_version inside the Client Hello message
360 * to get the correct minor version.
361 * However if we have only a pathologically small fragment of the
362 * Client Hello message, this would be difficult, and we'd have
363 * to read more records to find out.
364 * No known SSL 3.0 client fragments ClientHello like this,
365 * so we simply reject such connections to avoid
366 * protocol version downgrade attacks. */
367 if (p[3] == 0 && p[4] < 6) {
368 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
369 SSL_R_RECORD_TOO_SMALL);
370 return -1;
371 }
372 /* if major version number > 3 set minor to a value
373 * which will use the highest version 3 we support.
374 * If TLS 2.0 ever appears we will need to revise
375 * this....
376 */
377 if (p[9] > SSL3_VERSION_MAJOR)
378 v[1] = 0xff;
379 else
380 v[1] = p[10]; /* minor version according to client_version */
381 if (v[1] >= TLS1_VERSION_MINOR) {
382 if (v[1] >= TLS1_2_VERSION_MINOR &&
383 !(s->options & SSL_OP_NO_TLSv1_2)) {
384 s->version = TLS1_2_VERSION;
385 type = 3;
386 } else if (v[1] >= TLS1_1_VERSION_MINOR &&
387 !(s->options & SSL_OP_NO_TLSv1_1)) {
388 s->version = TLS1_1_VERSION;
389 type = 3;
390 } else if (!(s->options & SSL_OP_NO_TLSv1)) {
391 s->version = TLS1_VERSION;
392 type = 3;
393 } else if (!(s->options & SSL_OP_NO_SSLv3)) {
394 s->version = SSL3_VERSION;
395 type = 3;
396 }
397 } else {
398 /* client requests SSL 3.0 */
399 if (!(s->options & SSL_OP_NO_SSLv3)) {
400 s->version = SSL3_VERSION;
401 type = 3;
402 } else if (!(s->options & SSL_OP_NO_TLSv1)) {
403 /* we won't be able to use TLS of course,
404 * but this will send an appropriate alert */
405 s->version = TLS1_VERSION;
406 type = 3;
407 }
408 }
409 }
410 else if ((strncmp("GET ", (char *)p, 4) == 0) ||
411 (strncmp("POST ",(char *)p, 5) == 0) ||
412 (strncmp("HEAD ",(char *)p, 5) == 0) ||
413 (strncmp("PUT ", (char *)p, 4) == 0)) {
414 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTP_REQUEST);
415 return -1;
416 } else if (strncmp("CONNECT", (char *)p, 7) == 0) {
417 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTPS_PROXY_REQUEST);
418 return -1;
419 }
420 }
421
422 if (s->state == SSL23_ST_SR_CLNT_HELLO_B) {
423 /* we have SSLv3/TLSv1 in an SSLv2 header
424 * (other cases skip this state) */
425
426 type = 2;
427 p = s->packet;
428 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
429 v[1] = p[4];
430
431 /* An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
432 * header is sent directly on the wire, not wrapped as a TLS
433 * record. It's format is:
434 * Byte Content
435 * 0-1 msg_length
436 * 2 msg_type
437 * 3-4 version
438 * 5-6 cipher_spec_length
439 * 7-8 session_id_length
440 * 9-10 challenge_length
441 * ... ...
442 */
443 n = ((p[0] & 0x7f) << 8) | p[1];
444 if (n > (1024 * 4)) {
445 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_LARGE);
446 return -1;
447 }
448 if (n < 9) {
449 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
450 SSL_R_RECORD_LENGTH_MISMATCH);
451 return -1;
452 }
453
454 j = ssl23_read_bytes(s, n + 2);
455 if (j != n + 2)
456 return -1;
457
458 ssl3_finish_mac(s, s->packet + 2, s->packet_length - 2);
459 if (s->msg_callback)
460 s->msg_callback(0, SSL2_VERSION, 0, s->packet + 2,
461 s->packet_length - 2, s, s->msg_callback_arg);
462
463 p = s->packet;
464 p += 5;
465 n2s(p, csl);
466 n2s(p, sil);
467 n2s(p, cl);
468 d = (unsigned char *)s->init_buf->data;
469 if ((csl + sil + cl + 11) != s->packet_length) {
470 /*
471 * We can't have TLS extensions in SSL 2.0 format
472 * Client Hello, can we ? Error condition should be
473 * '>' otherwise
474 */
475 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
476 SSL_R_RECORD_LENGTH_MISMATCH);
477 return -1;
478 }
479
480 /* record header: msg_type ... */
481 *(d++) = SSL3_MT_CLIENT_HELLO;
482 /* ... and length (actual value will be written later) */
483 d_len = d;
484 d += 3;
485
486 /* client_version */
487 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
488 *(d++) = v[1];
489
490 /* lets populate the random area */
491 /* get the challenge_length */
492 i = (cl > SSL3_RANDOM_SIZE) ? SSL3_RANDOM_SIZE : cl;
493 memset(d, 0, SSL3_RANDOM_SIZE);
494 memcpy(&(d[SSL3_RANDOM_SIZE - i]), &(p[csl + sil]), i);
495 d += SSL3_RANDOM_SIZE;
496
497 /* no session-id reuse */
498 *(d++) = 0;
499
500 /* ciphers */
501 j = 0;
502 dd = d;
503 d += 2;
504 for (i = 0; i < csl; i += 3) {
505 if (p[i] != 0)
506 continue;
507 *(d++) = p[i + 1];
508 *(d++) = p[i + 2];
509 j += 2;
510 }
511 s2n(j, dd);
512
513 /* add in (no) COMPRESSION */
514 *(d++) = 1;
515 *(d++) = 0;
516
517 i = (d - (unsigned char *)s->init_buf->data) - 4;
518 l2n3((long)i, d_len);
519
520 /* get the data reused from the init_buf */
521 s->s3->tmp.reuse_message = 1;
522 s->s3->tmp.message_type = SSL3_MT_CLIENT_HELLO;
523 s->s3->tmp.message_size = i;
524 }
525
526 /* imaginary new state (for program structure): */
527 /* s->state = SSL23_SR_CLNT_HELLO_C */
528
529 if (type == 1) {
530 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
531 return -1;
532 }
533
534 if ((type == 2) || (type == 3)) {
535 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
536
537 if (!ssl_init_wbio_buffer(s, 1))
538 return -1;
539
540 /* we are in this state */
541 s->state = SSL3_ST_SR_CLNT_HELLO_A;
542
543 if (type == 3) {
544 /* put the 'n' bytes we have read into the input buffer
545 * for SSLv3 */
546 s->rstate = SSL_ST_READ_HEADER;
547 s->packet_length = n;
548 if (s->s3->rbuf.buf == NULL)
549 if (!ssl3_setup_read_buffer(s))
550 return -1;
551
552 s->packet = &(s->s3->rbuf.buf[0]);
553 memcpy(s->packet, buf, n);
554 s->s3->rbuf.left = n;
555 s->s3->rbuf.offset = 0;
556 } else {
557 s->packet_length = 0;
558 s->s3->rbuf.left = 0;
559 s->s3->rbuf.offset = 0;
560 }
561 if (s->version == TLS1_2_VERSION)
562 s->method = TLSv1_2_server_method();
563 else if (s->version == TLS1_1_VERSION)
564 s->method = TLSv1_1_server_method();
565 else if (s->version == TLS1_VERSION)
566 s->method = TLSv1_server_method();
567 else
568 s->method = SSLv3_server_method();
569 s->handshake_func = s->method->ssl_accept;
570 }
571
572 if ((type < 1) || (type > 3)) {
573 /* bad, very bad */
574 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
575 return -1;
576 }
577 s->init_num = 0;
578
579 return (SSL_accept(s));
580}
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