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1/* $OpenBSD: s23_srvr.c,v 1.47 2016/07/16 04:42:35 beck 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
120int ssl23_get_client_hello(SSL *s);
121
122int
123ssl23_accept(SSL *s)
124{
125 void (*cb)(const SSL *ssl, int type, int val) = NULL;
126 int ret = -1;
127 int new_state, state;
128
129 ERR_clear_error();
130 errno = 0;
131
132 if (s->info_callback != NULL)
133 cb = s->info_callback;
134 else if (s->ctx->info_callback != NULL)
135 cb = s->ctx->info_callback;
136
137 s->in_handshake++;
138 if (!SSL_in_init(s) || SSL_in_before(s))
139 SSL_clear(s);
140
141 for (;;) {
142 state = s->state;
143
144 switch (s->state) {
145 case SSL_ST_BEFORE:
146 case SSL_ST_ACCEPT:
147 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
148 case SSL_ST_OK|SSL_ST_ACCEPT:
149
150 s->server = 1;
151 if (cb != NULL)
152 cb(s, SSL_CB_HANDSHAKE_START, 1);
153
154 /* s->version=SSL3_VERSION; */
155 s->type = SSL_ST_ACCEPT;
156
157 if (!ssl3_setup_init_buffer(s)) {
158 ret = -1;
159 goto end;
160 }
161 if (!tls1_init_finished_mac(s)) {
162 ret = -1;
163 goto end;
164 }
165
166 s->state = SSL23_ST_SR_CLNT_HELLO_A;
167 s->ctx->stats.sess_accept++;
168 s->init_num = 0;
169 break;
170
171 case SSL23_ST_SR_CLNT_HELLO_A:
172 case SSL23_ST_SR_CLNT_HELLO_B:
173
174 s->shutdown = 0;
175 ret = ssl23_get_client_hello(s);
176 if (ret >= 0)
177 cb = NULL;
178 goto end;
179 /* break; */
180
181 default:
182 SSLerr(SSL_F_SSL23_ACCEPT, SSL_R_UNKNOWN_STATE);
183 ret = -1;
184 goto end;
185 /* break; */
186 }
187
188 if ((cb != NULL) && (s->state != state)) {
189 new_state = s->state;
190 s->state = state;
191 cb(s, SSL_CB_ACCEPT_LOOP, 1);
192 s->state = new_state;
193 }
194 }
195
196end:
197 s->in_handshake--;
198 if (cb != NULL)
199 cb(s, SSL_CB_ACCEPT_EXIT, ret);
200
201 return (ret);
202}
203
204
205int
206ssl23_get_client_hello(SSL *s)
207{
208 char buf[11];
209 /*
210 * sizeof(buf) == 11, because we'll need to request this many bytes in
211 * the initial read.
212 * We can detect SSL 3.0/TLS 1.0 Client Hellos ('type == 3') correctly
213 * only when the following is in a single record, which is not
214 * guaranteed by the protocol specification:
215 * Byte Content
216 * 0 type \
217 * 1/2 version > record header
218 * 3/4 length /
219 * 5 msg_type \
220 * 6-8 length > Client Hello message
221 * 9/10 client_version /
222 */
223 unsigned char *p, *d, *d_len, *dd;
224 unsigned int i;
225 unsigned int csl, sil, cl;
226 int n = 0, j;
227 int type = 0;
228 int v[2];
229
230 if (s->state == SSL23_ST_SR_CLNT_HELLO_A) {
231 /* read the initial header */
232 v[0] = v[1] = 0;
233
234 if (!ssl3_setup_buffers(s))
235 return -1;
236
237 n = ssl23_read_bytes(s, sizeof buf);
238 if (n != sizeof buf)
239 return(n);
240
241 p = s->packet;
242
243 memcpy(buf, p, n);
244
245 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) {
246 /*
247 * SSLv2 header
248 */
249 if ((p[3] == 0x00) && (p[4] == 0x02)) {
250 /* SSLv2 support has been removed */
251 goto unsupported;
252
253 } else if (p[3] == SSL3_VERSION_MAJOR) {
254 v[0] = p[3];
255 v[1] = p[4];
256 /* SSLv3/TLS */
257
258 if (p[4] >= TLS1_VERSION_MINOR) {
259 if (p[4] >= TLS1_2_VERSION_MINOR &&
260 !(s->options & SSL_OP_NO_TLSv1_2)) {
261 s->version = TLS1_2_VERSION;
262 s->state = SSL23_ST_SR_CLNT_HELLO_B;
263 } else if (p[4] >= TLS1_1_VERSION_MINOR &&
264 !(s->options & SSL_OP_NO_TLSv1_1)) {
265 s->version = TLS1_1_VERSION;
266 /* type=2; */ /* done later to survive restarts */
267 s->state = SSL23_ST_SR_CLNT_HELLO_B;
268 } else if (!(s->options & SSL_OP_NO_TLSv1)) {
269 s->version = TLS1_VERSION;
270 /* type=2; */ /* done later to survive restarts */
271 s->state = SSL23_ST_SR_CLNT_HELLO_B;
272 } else {
273 goto unsupported;
274 }
275 } else {
276 /* SSLv3 support has been removed */
277 goto unsupported;
278 }
279 }
280 } else if ((p[0] == SSL3_RT_HANDSHAKE) &&
281 (p[1] == SSL3_VERSION_MAJOR) &&
282 (p[5] == SSL3_MT_CLIENT_HELLO) &&
283 ((p[3] == 0 && p[4] < 5 /* silly record length? */) ||
284 (p[9] >= p[1]))) {
285 /*
286 * SSLv3 or tls1 header
287 */
288
289 v[0] = p[1]; /* major version (= SSL3_VERSION_MAJOR) */
290 /* We must look at client_version inside the Client Hello message
291 * to get the correct minor version.
292 * However if we have only a pathologically small fragment of the
293 * Client Hello message, this would be difficult, and we'd have
294 * to read more records to find out.
295 * No known SSL 3.0 client fragments ClientHello like this,
296 * so we simply reject such connections to avoid
297 * protocol version downgrade attacks. */
298 if (p[3] == 0 && p[4] < 6) {
299 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
300 SSL_R_RECORD_TOO_SMALL);
301 return -1;
302 }
303 /* if major version number > 3 set minor to a value
304 * which will use the highest version 3 we support.
305 * If TLS 2.0 ever appears we will need to revise
306 * this....
307 */
308 if (p[9] > SSL3_VERSION_MAJOR)
309 v[1] = 0xff;
310 else
311 v[1] = p[10]; /* minor version according to client_version */
312 if (v[1] >= TLS1_VERSION_MINOR) {
313 if (v[1] >= TLS1_2_VERSION_MINOR &&
314 !(s->options & SSL_OP_NO_TLSv1_2)) {
315 s->version = TLS1_2_VERSION;
316 type = 3;
317 } else if (v[1] >= TLS1_1_VERSION_MINOR &&
318 !(s->options & SSL_OP_NO_TLSv1_1)) {
319 s->version = TLS1_1_VERSION;
320 type = 3;
321 } else if (!(s->options & SSL_OP_NO_TLSv1)) {
322 s->version = TLS1_VERSION;
323 type = 3;
324 } else {
325 goto unsupported;
326 }
327 } else {
328 /* SSLv3 */
329 if (!(s->options & SSL_OP_NO_TLSv1)) {
330 /* we won't be able to use TLS of course,
331 * but this will send an appropriate alert */
332 s->version = TLS1_VERSION;
333 type = 3;
334 } else {
335 goto unsupported;
336 }
337 }
338 }
339 else if ((strncmp("GET ", (char *)p, 4) == 0) ||
340 (strncmp("POST ",(char *)p, 5) == 0) ||
341 (strncmp("HEAD ",(char *)p, 5) == 0) ||
342 (strncmp("PUT ", (char *)p, 4) == 0)) {
343 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTP_REQUEST);
344 return -1;
345 } else if (strncmp("CONNECT", (char *)p, 7) == 0) {
346 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTPS_PROXY_REQUEST);
347 return -1;
348 }
349 }
350
351 if (s->state == SSL23_ST_SR_CLNT_HELLO_B) {
352 /* we have SSLv3/TLSv1 in an SSLv2 header
353 * (other cases skip this state) */
354
355 /*
356 * Limit the support of "backward compatible" headers
357 * only to "backward" versions of TLS. If we have moved
358 * on to modernity, just say no.
359 */
360 if (s->options & SSL_OP_NO_TLSv1)
361 goto unsupported;
362
363 type = 2;
364 p = s->packet;
365 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
366 v[1] = p[4];
367
368 /* An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
369 * header is sent directly on the wire, not wrapped as a TLS
370 * record. It's format is:
371 * Byte Content
372 * 0-1 msg_length
373 * 2 msg_type
374 * 3-4 version
375 * 5-6 cipher_spec_length
376 * 7-8 session_id_length
377 * 9-10 challenge_length
378 * ... ...
379 */
380 n = ((p[0] & 0x7f) << 8) | p[1];
381 if (n > (1024 * 4)) {
382 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_LARGE);
383 return -1;
384 }
385 if (n < 9) {
386 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
387 SSL_R_RECORD_LENGTH_MISMATCH);
388 return -1;
389 }
390
391 j = ssl23_read_bytes(s, n + 2);
392 if (j != n + 2)
393 return -1;
394
395 tls1_finish_mac(s, s->packet + 2, s->packet_length - 2);
396 if (s->msg_callback)
397 s->msg_callback(0, SSL2_VERSION, 0, s->packet + 2,
398 s->packet_length - 2, s, s->msg_callback_arg);
399
400 p = s->packet;
401 p += 5;
402 n2s(p, csl);
403 n2s(p, sil);
404 n2s(p, cl);
405 d = (unsigned char *)s->init_buf->data;
406 if ((csl + sil + cl + 11) != s->packet_length) {
407 /*
408 * We can't have TLS extensions in SSL 2.0 format
409 * Client Hello, can we ? Error condition should be
410 * '>' otherwise
411 */
412 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
413 SSL_R_RECORD_LENGTH_MISMATCH);
414 return -1;
415 }
416
417 /* record header: msg_type ... */
418 *(d++) = SSL3_MT_CLIENT_HELLO;
419 /* ... and length (actual value will be written later) */
420 d_len = d;
421 d += 3;
422
423 /* client_version */
424 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
425 *(d++) = v[1];
426
427 /* lets populate the random area */
428 /* get the challenge_length */
429 i = (cl > SSL3_RANDOM_SIZE) ? SSL3_RANDOM_SIZE : cl;
430 memset(d, 0, SSL3_RANDOM_SIZE);
431 memcpy(&(d[SSL3_RANDOM_SIZE - i]), &(p[csl + sil]), i);
432 d += SSL3_RANDOM_SIZE;
433
434 /* no session-id reuse */
435 *(d++) = 0;
436
437 /* ciphers */
438 j = 0;
439 dd = d;
440 d += 2;
441 for (i = 0; i < csl; i += 3) {
442 if (p[i] != 0)
443 continue;
444 *(d++) = p[i + 1];
445 *(d++) = p[i + 2];
446 j += 2;
447 }
448 s2n(j, dd);
449
450 /* add in (no) COMPRESSION */
451 *(d++) = 1;
452 *(d++) = 0;
453
454 i = (d - (unsigned char *)s->init_buf->data) - 4;
455 l2n3((long)i, d_len);
456
457 /* get the data reused from the init_buf */
458 s->s3->tmp.reuse_message = 1;
459 s->s3->tmp.message_type = SSL3_MT_CLIENT_HELLO;
460 s->s3->tmp.message_size = i;
461 }
462
463 /* imaginary new state (for program structure): */
464 /* s->state = SSL23_SR_CLNT_HELLO_C */
465
466 if (type == 2 || type == 3) {
467 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
468
469 if (!ssl_init_wbio_buffer(s, 1))
470 return -1;
471
472 /* we are in this state */
473 s->state = SSL3_ST_SR_CLNT_HELLO_A;
474
475 if (type == 3) {
476 /* put the 'n' bytes we have read into the input buffer
477 * for SSLv3 */
478 s->rstate = SSL_ST_READ_HEADER;
479 s->packet_length = n;
480 if (s->s3->rbuf.buf == NULL)
481 if (!ssl3_setup_read_buffer(s))
482 return -1;
483
484 s->packet = &(s->s3->rbuf.buf[0]);
485 memcpy(s->packet, buf, n);
486 s->s3->rbuf.left = n;
487 s->s3->rbuf.offset = 0;
488 } else {
489 s->packet_length = 0;
490 s->s3->rbuf.left = 0;
491 s->s3->rbuf.offset = 0;
492 }
493 if (s->version == TLS1_2_VERSION)
494 s->method = TLSv1_2_server_method();
495 else if (s->version == TLS1_1_VERSION)
496 s->method = TLSv1_1_server_method();
497 else if (s->version == TLS1_VERSION)
498 s->method = TLSv1_server_method();
499 else
500 goto unsupported;
501 s->handshake_func = s->method->ssl_accept;
502 } else {
503 /* bad, very bad */
504 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
505 return -1;
506 }
507 s->init_num = 0;
508
509 return (SSL_accept(s));
510
511 unsupported:
512 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
513 return -1;
514}
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