Line data Source code
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 0 : static const SSL_METHOD *ssl23_get_server_method(int ver)
125 : {
126 : #ifndef OPENSSL_NO_SSL2
127 0 : if (ver == SSL2_VERSION)
128 0 : return (SSLv2_server_method());
129 : #endif
130 : #ifndef OPENSSL_NO_SSL3
131 0 : if (ver == SSL3_VERSION)
132 0 : return (SSLv3_server_method());
133 : #endif
134 0 : if (ver == TLS1_VERSION)
135 0 : return (TLSv1_server_method());
136 0 : else if (ver == TLS1_1_VERSION)
137 0 : return (TLSv1_1_server_method());
138 0 : else if (ver == TLS1_2_VERSION)
139 0 : return (TLSv1_2_server_method());
140 : else
141 : return (NULL);
142 : }
143 :
144 0 : IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
145 : ssl23_accept,
146 : ssl_undefined_function, ssl23_get_server_method)
147 :
148 0 : int ssl23_accept(SSL *s)
149 : {
150 : BUF_MEM *buf;
151 0 : unsigned long Time = (unsigned long)time(NULL);
152 : void (*cb) (const SSL *ssl, int type, int val) = NULL;
153 : int ret = -1;
154 : int new_state, state;
155 :
156 0 : RAND_add(&Time, sizeof(Time), 0);
157 0 : ERR_clear_error();
158 0 : clear_sys_error();
159 :
160 0 : if (s->info_callback != NULL)
161 : cb = s->info_callback;
162 0 : else if (s->ctx->info_callback != NULL)
163 : cb = s->ctx->info_callback;
164 :
165 0 : s->in_handshake++;
166 0 : if (!SSL_in_init(s) || SSL_in_before(s))
167 0 : SSL_clear(s);
168 :
169 : for (;;) {
170 0 : state = s->state;
171 :
172 0 : switch (s->state) {
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 0 : s->server = 1;
179 0 : if (cb != NULL)
180 0 : cb(s, SSL_CB_HANDSHAKE_START, 1);
181 :
182 : /* s->version=SSL3_VERSION; */
183 0 : s->type = SSL_ST_ACCEPT;
184 :
185 0 : if (s->init_buf == NULL) {
186 0 : if ((buf = BUF_MEM_new()) == NULL) {
187 : ret = -1;
188 : goto end;
189 : }
190 0 : if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
191 0 : BUF_MEM_free(buf);
192 : ret = -1;
193 0 : goto end;
194 : }
195 0 : s->init_buf = buf;
196 : }
197 :
198 0 : ssl3_init_finished_mac(s);
199 :
200 0 : s->state = SSL23_ST_SR_CLNT_HELLO_A;
201 0 : s->ctx->stats.sess_accept++;
202 0 : s->init_num = 0;
203 : break;
204 :
205 : case SSL23_ST_SR_CLNT_HELLO_A:
206 : case SSL23_ST_SR_CLNT_HELLO_B:
207 :
208 0 : s->shutdown = 0;
209 0 : ret = ssl23_get_client_hello(s);
210 0 : if (ret >= 0)
211 : cb = NULL;
212 : goto end;
213 : /* break; */
214 :
215 : default:
216 0 : SSLerr(SSL_F_SSL23_ACCEPT, SSL_R_UNKNOWN_STATE);
217 : ret = -1;
218 0 : goto end;
219 : /* break; */
220 : }
221 :
222 0 : if ((cb != NULL) && (s->state != state)) {
223 : new_state = s->state;
224 0 : s->state = state;
225 0 : cb(s, SSL_CB_ACCEPT_LOOP, 1);
226 0 : s->state = new_state;
227 : }
228 : }
229 : end:
230 0 : s->in_handshake--;
231 0 : if (cb != NULL)
232 0 : cb(s, SSL_CB_ACCEPT_EXIT, ret);
233 0 : return (ret);
234 : }
235 :
236 0 : int ssl23_get_client_hello(SSL *s)
237 : {
238 : /*-
239 : * Request this many bytes in initial read.
240 : * We can detect SSL 3.0/TLS 1.0 Client Hellos
241 : * ('type == 3') correctly only when the following
242 : * is in a single record, which is not guaranteed by
243 : * the protocol specification:
244 : * Byte Content
245 : * 0 type \
246 : * 1/2 version > record header
247 : * 3/4 length /
248 : * 5 msg_type \
249 : * 6-8 length > Client Hello message
250 : * 9/10 client_version /
251 : */
252 : char buf_space[11];
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 0 : if (s->state == SSL23_ST_SR_CLNT_HELLO_A) {
262 : /* read the initial header */
263 : v[0] = v[1] = 0;
264 :
265 0 : if (!ssl3_setup_buffers(s))
266 : goto err;
267 :
268 0 : n = ssl23_read_bytes(s, sizeof buf_space);
269 0 : if (n != sizeof buf_space)
270 : return (n); /* n == -1 || n == 0 */
271 :
272 0 : p = s->packet;
273 :
274 0 : memcpy(buf, p, n);
275 :
276 0 : if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) {
277 : /*
278 : * SSLv2 header
279 : */
280 0 : if ((p[3] == 0x00) && (p[4] == 0x02)) {
281 : v[0] = p[3];
282 : v[1] = p[4];
283 : /* SSLv2 */
284 0 : if (!(s->options & SSL_OP_NO_SSLv2))
285 : type = 1;
286 0 : } else if (p[3] == SSL3_VERSION_MAJOR) {
287 : v[0] = p[3];
288 0 : v[1] = p[4];
289 : /* SSLv3/TLSv1 */
290 0 : if (p[4] >= TLS1_VERSION_MINOR) {
291 0 : if (p[4] >= TLS1_2_VERSION_MINOR &&
292 0 : !(s->options & SSL_OP_NO_TLSv1_2)) {
293 0 : s->version = TLS1_2_VERSION;
294 0 : s->state = SSL23_ST_SR_CLNT_HELLO_B;
295 0 : } else if (p[4] >= TLS1_1_VERSION_MINOR &&
296 0 : !(s->options & SSL_OP_NO_TLSv1_1)) {
297 0 : s->version = TLS1_1_VERSION;
298 : /*
299 : * type=2;
300 : *//*
301 : * done later to survive restarts
302 : */
303 0 : s->state = SSL23_ST_SR_CLNT_HELLO_B;
304 0 : } else if (!(s->options & SSL_OP_NO_TLSv1)) {
305 0 : s->version = TLS1_VERSION;
306 : /*
307 : * type=2;
308 : *//*
309 : * done later to survive restarts
310 : */
311 0 : s->state = SSL23_ST_SR_CLNT_HELLO_B;
312 0 : } else if (!(s->options & SSL_OP_NO_SSLv3)) {
313 0 : s->version = SSL3_VERSION;
314 : /* type=2; */
315 0 : s->state = SSL23_ST_SR_CLNT_HELLO_B;
316 0 : } else if (!(s->options & SSL_OP_NO_SSLv2)) {
317 : type = 1;
318 : }
319 0 : } else if (!(s->options & SSL_OP_NO_SSLv3)) {
320 0 : s->version = SSL3_VERSION;
321 : /* type=2; */
322 0 : s->state = SSL23_ST_SR_CLNT_HELLO_B;
323 0 : } else if (!(s->options & SSL_OP_NO_SSLv2))
324 : type = 1;
325 :
326 : }
327 : }
328 : /* p[4] < 5 ... silly record length? */
329 0 : else if ((p[0] == SSL3_RT_HANDSHAKE) &&
330 0 : (p[1] == SSL3_VERSION_MAJOR) &&
331 0 : (p[5] == SSL3_MT_CLIENT_HELLO) && ((p[3] == 0 && p[4] < 5)
332 0 : || (p[9] >= p[1]))) {
333 : /*
334 : * SSLv3 or tls1 header
335 : */
336 :
337 : v[0] = p[1]; /* major version (= SSL3_VERSION_MAJOR) */
338 : /*
339 : * We must look at client_version inside the Client Hello message
340 : * to get the correct minor version. However if we have only a
341 : * pathologically small fragment of the Client Hello message, this
342 : * would be difficult, and we'd have to read more records to find
343 : * out. No known SSL 3.0 client fragments ClientHello like this,
344 : * so we simply reject such connections to avoid protocol version
345 : * downgrade attacks.
346 : */
347 0 : if (p[3] == 0 && p[4] < 6) {
348 0 : SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_SMALL);
349 0 : goto err;
350 : }
351 : /*
352 : * if major version number > 3 set minor to a value which will
353 : * use the highest version 3 we support. If TLS 2.0 ever appears
354 : * we will need to revise this....
355 : */
356 0 : if (p[9] > SSL3_VERSION_MAJOR)
357 : v[1] = 0xff;
358 : else
359 0 : v[1] = p[10]; /* minor version according to client_version */
360 0 : if (v[1] >= TLS1_VERSION_MINOR) {
361 0 : if (v[1] >= TLS1_2_VERSION_MINOR &&
362 0 : !(s->options & SSL_OP_NO_TLSv1_2)) {
363 0 : s->version = TLS1_2_VERSION;
364 0 : type = 3;
365 0 : } else if (v[1] >= TLS1_1_VERSION_MINOR &&
366 0 : !(s->options & SSL_OP_NO_TLSv1_1)) {
367 0 : s->version = TLS1_1_VERSION;
368 0 : type = 3;
369 0 : } else if (!(s->options & SSL_OP_NO_TLSv1)) {
370 0 : s->version = TLS1_VERSION;
371 : type = 3;
372 0 : } else if (!(s->options & SSL_OP_NO_SSLv3)) {
373 0 : s->version = SSL3_VERSION;
374 : type = 3;
375 : }
376 : } else {
377 : /* client requests SSL 3.0 */
378 0 : if (!(s->options & SSL_OP_NO_SSLv3)) {
379 0 : s->version = SSL3_VERSION;
380 : type = 3;
381 0 : } else if (!(s->options & SSL_OP_NO_TLSv1)) {
382 : /*
383 : * we won't be able to use TLS of course, but this will
384 : * send an appropriate alert
385 : */
386 0 : s->version = TLS1_VERSION;
387 : type = 3;
388 : }
389 : }
390 0 : } else if ((strncmp("GET ", (char *)p, 4) == 0) ||
391 0 : (strncmp("POST ", (char *)p, 5) == 0) ||
392 0 : (strncmp("HEAD ", (char *)p, 5) == 0) ||
393 0 : (strncmp("PUT ", (char *)p, 4) == 0)) {
394 0 : SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTP_REQUEST);
395 0 : goto err;
396 0 : } else if (strncmp("CONNECT", (char *)p, 7) == 0) {
397 0 : SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTPS_PROXY_REQUEST);
398 0 : goto err;
399 : }
400 : }
401 :
402 : /* ensure that TLS_MAX_VERSION is up-to-date */
403 0 : OPENSSL_assert(s->version <= TLS_MAX_VERSION);
404 :
405 0 : if (s->version < TLS1_2_VERSION && tls1_suiteb(s)) {
406 0 : SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
407 : SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
408 0 : goto err;
409 : }
410 : #ifdef OPENSSL_FIPS
411 : if (FIPS_mode() && (s->version < TLS1_VERSION)) {
412 : SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
413 : SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
414 : goto err;
415 : }
416 : #endif
417 :
418 0 : if (s->state == SSL23_ST_SR_CLNT_HELLO_B) {
419 : /*
420 : * we have SSLv3/TLSv1 in an SSLv2 header (other cases skip this
421 : * state)
422 : */
423 :
424 : type = 2;
425 0 : p = s->packet;
426 : v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
427 0 : v[1] = p[4];
428 :
429 : /*-
430 : * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
431 : * header is sent directly on the wire, not wrapped as a TLS
432 : * record. It's format is:
433 : * Byte Content
434 : * 0-1 msg_length
435 : * 2 msg_type
436 : * 3-4 version
437 : * 5-6 cipher_spec_length
438 : * 7-8 session_id_length
439 : * 9-10 challenge_length
440 : * ... ...
441 : */
442 0 : n = ((p[0] & 0x7f) << 8) | p[1];
443 0 : if (n > (1024 * 4)) {
444 0 : SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_LARGE);
445 0 : goto err;
446 : }
447 0 : if (n < 9) {
448 0 : SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
449 : SSL_R_RECORD_LENGTH_MISMATCH);
450 0 : goto err;
451 : }
452 :
453 0 : j = ssl23_read_bytes(s, n + 2);
454 : /*
455 : * We previously read 11 bytes, so if j > 0, we must have j == n+2 ==
456 : * s->packet_length. We have at least 11 valid packet bytes.
457 : */
458 0 : if (j <= 0)
459 : return (j);
460 :
461 0 : ssl3_finish_mac(s, s->packet + 2, s->packet_length - 2);
462 :
463 : /* CLIENT-HELLO */
464 0 : if (s->msg_callback)
465 0 : s->msg_callback(0, SSL2_VERSION, 0, s->packet + 2,
466 0 : s->packet_length - 2, s, s->msg_callback_arg);
467 :
468 0 : p = s->packet;
469 : p += 5;
470 0 : n2s(p, csl);
471 0 : n2s(p, sil);
472 0 : n2s(p, cl);
473 0 : d = (unsigned char *)s->init_buf->data;
474 0 : if ((csl + sil + cl + 11) != s->packet_length) { /* We can't have TLS
475 : * extensions in SSL
476 : * 2.0 format *
477 : * Client Hello, can
478 : * we? Error
479 : * condition should
480 : * be * '>'
481 : * otherweise */
482 0 : SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
483 : SSL_R_RECORD_LENGTH_MISMATCH);
484 0 : goto err;
485 : }
486 :
487 : /* record header: msg_type ... */
488 0 : *(d++) = SSL3_MT_CLIENT_HELLO;
489 : /* ... and length (actual value will be written later) */
490 : d_len = d;
491 : d += 3;
492 :
493 : /* client_version */
494 0 : *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
495 0 : *(d++) = v[1];
496 :
497 : /* lets populate the random area */
498 : /* get the challenge_length */
499 0 : i = (cl > SSL3_RANDOM_SIZE) ? SSL3_RANDOM_SIZE : cl;
500 : memset(d, 0, SSL3_RANDOM_SIZE);
501 0 : memcpy(&(d[SSL3_RANDOM_SIZE - i]), &(p[csl + sil]), i);
502 : d += SSL3_RANDOM_SIZE;
503 :
504 : /* no session-id reuse */
505 0 : *(d++) = 0;
506 :
507 : /* ciphers */
508 : j = 0;
509 : dd = d;
510 0 : d += 2;
511 0 : for (i = 0; i < csl; i += 3) {
512 0 : if (p[i] != 0)
513 0 : continue;
514 0 : *(d++) = p[i + 1];
515 0 : *(d++) = p[i + 2];
516 0 : j += 2;
517 : }
518 0 : s2n(j, dd);
519 :
520 : /* COMPRESSION */
521 0 : *(d++) = 1;
522 0 : *(d++) = 0;
523 :
524 : #if 0
525 : /* copy any remaining data with may be extensions */
526 : p = p + csl + sil + cl;
527 : while (p < s->packet + s->packet_length) {
528 : *(d++) = *(p++);
529 : }
530 : #endif
531 :
532 0 : i = (d - (unsigned char *)s->init_buf->data) - 4;
533 0 : l2n3((long)i, d_len);
534 :
535 : /* get the data reused from the init_buf */
536 0 : s->s3->tmp.reuse_message = 1;
537 0 : s->s3->tmp.message_type = SSL3_MT_CLIENT_HELLO;
538 0 : s->s3->tmp.message_size = i;
539 : }
540 :
541 : /* imaginary new state (for program structure): */
542 : /* s->state = SSL23_SR_CLNT_HELLO_C */
543 :
544 0 : if (type == 1) {
545 : #ifdef OPENSSL_NO_SSL2
546 : SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
547 : goto err;
548 : #else
549 : /* we are talking sslv2 */
550 : /*
551 : * we need to clean up the SSLv3/TLSv1 setup and put in the sslv2
552 : * stuff.
553 : */
554 :
555 0 : if (s->s2 == NULL) {
556 0 : if (!ssl2_new(s))
557 : goto err;
558 : } else
559 0 : ssl2_clear(s);
560 :
561 0 : if (s->s3 != NULL)
562 0 : ssl3_free(s);
563 :
564 0 : if (!BUF_MEM_grow_clean(s->init_buf,
565 : SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) {
566 : goto err;
567 : }
568 :
569 0 : s->state = SSL2_ST_GET_CLIENT_HELLO_A;
570 0 : if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3)
571 0 : s->s2->ssl2_rollback = 0;
572 : else
573 : /*
574 : * reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
575 : * (SSL 3.0 draft/RFC 2246, App. E.2)
576 : */
577 0 : s->s2->ssl2_rollback = 1;
578 :
579 : /*
580 : * setup the n bytes we have read so we get them from the sslv2
581 : * buffer
582 : */
583 0 : s->rstate = SSL_ST_READ_HEADER;
584 0 : s->packet_length = n;
585 0 : s->packet = &(s->s2->rbuf[0]);
586 0 : memcpy(s->packet, buf, n);
587 0 : s->s2->rbuf_left = n;
588 0 : s->s2->rbuf_offs = 0;
589 :
590 0 : s->method = SSLv2_server_method();
591 0 : s->handshake_func = s->method->ssl_accept;
592 : #endif
593 : }
594 :
595 0 : if ((type == 2) || (type == 3)) {
596 : /*
597 : * we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style)
598 : */
599 : const SSL_METHOD *new_method;
600 0 : new_method = ssl23_get_server_method(s->version);
601 0 : if (new_method == NULL) {
602 0 : SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
603 0 : goto err;
604 : }
605 0 : s->method = new_method;
606 :
607 0 : if (!ssl_init_wbio_buffer(s, 1))
608 : goto err;
609 :
610 : /* we are in this state */
611 0 : s->state = SSL3_ST_SR_CLNT_HELLO_A;
612 :
613 0 : if (type == 3) {
614 : /*
615 : * put the 'n' bytes we have read into the input buffer for SSLv3
616 : */
617 0 : s->rstate = SSL_ST_READ_HEADER;
618 0 : s->packet_length = n;
619 0 : if (s->s3->rbuf.buf == NULL)
620 0 : if (!ssl3_setup_read_buffer(s))
621 : goto err;
622 :
623 0 : s->packet = &(s->s3->rbuf.buf[0]);
624 0 : memcpy(s->packet, buf, n);
625 0 : s->s3->rbuf.left = n;
626 0 : s->s3->rbuf.offset = 0;
627 : } else {
628 0 : s->packet_length = 0;
629 0 : s->s3->rbuf.left = 0;
630 0 : s->s3->rbuf.offset = 0;
631 : }
632 : #if 0 /* ssl3_get_client_hello does this */
633 : s->client_version = (v[0] << 8) | v[1];
634 : #endif
635 0 : s->handshake_func = s->method->ssl_accept;
636 : }
637 :
638 0 : if ((type < 1) || (type > 3)) {
639 : /* bad, very bad */
640 0 : SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
641 0 : goto err;
642 : }
643 0 : s->init_num = 0;
644 :
645 : if (buf != buf_space)
646 : OPENSSL_free(buf);
647 0 : return (SSL_accept(s));
648 : err:
649 : if (buf != buf_space)
650 : OPENSSL_free(buf);
651 : return (-1);
652 : }
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