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) 1998-2001 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
119 static SSL_METHOD *ssl23_get_server_method(int ver);
120 int ssl23_get_client_hello(SSL *s);
ssl23_get_server_method(int ver)121 static SSL_METHOD *ssl23_get_server_method(int ver)
122 {
123 #ifndef OPENSSL_NO_SSL2
124 if (ver == SSL2_VERSION)
125 return(SSLv2_server_method());
126 #endif
127 if (ver == SSL3_VERSION)
128 return(SSLv3_server_method());
129 else if (ver == TLS1_VERSION)
130 return(TLSv1_server_method());
131 else
132 return(NULL);
133 }
134
IMPLEMENT_ssl23_meth_func(SSLv23_server_method,ssl23_accept,ssl_undefined_function,ssl23_get_server_method)135 IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
136 ssl23_accept,
137 ssl_undefined_function,
138 ssl23_get_server_method)
139
140 int ssl23_accept(SSL *s)
141 {
142 BUF_MEM *buf;
143 unsigned long Time=(unsigned long)time(NULL);
144 void (*cb)(const SSL *ssl,int type,int val)=NULL;
145 int ret= -1;
146 int new_state,state;
147
148 RAND_add(&Time,sizeof(Time),0);
149 ERR_clear_error();
150 clear_sys_error();
151
152 if (s->info_callback != NULL)
153 cb=s->info_callback;
154 else if (s->ctx->info_callback != NULL)
155 cb=s->ctx->info_callback;
156
157 s->in_handshake++;
158 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
159
160 for (;;)
161 {
162 state=s->state;
163
164 switch(s->state)
165 {
166 case SSL_ST_BEFORE:
167 case SSL_ST_ACCEPT:
168 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
169 case SSL_ST_OK|SSL_ST_ACCEPT:
170
171 s->server=1;
172 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
173
174 /* s->version=SSL3_VERSION; */
175 s->type=SSL_ST_ACCEPT;
176
177 if (s->init_buf == NULL)
178 {
179 if ((buf=BUF_MEM_new()) == NULL)
180 {
181 ret= -1;
182 goto end;
183 }
184 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
185 {
186 ret= -1;
187 goto end;
188 }
189 s->init_buf=buf;
190 }
191
192 ssl3_init_finished_mac(s);
193
194 s->state=SSL23_ST_SR_CLNT_HELLO_A;
195 s->ctx->stats.sess_accept++;
196 s->init_num=0;
197 break;
198
199 case SSL23_ST_SR_CLNT_HELLO_A:
200 case SSL23_ST_SR_CLNT_HELLO_B:
201
202 s->shutdown=0;
203 ret=ssl23_get_client_hello(s);
204 if (ret >= 0) cb=NULL;
205 goto end;
206 /* break; */
207
208 default:
209 SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
210 ret= -1;
211 goto end;
212 /* break; */
213 }
214
215 if ((cb != NULL) && (s->state != state))
216 {
217 new_state=s->state;
218 s->state=state;
219 cb(s,SSL_CB_ACCEPT_LOOP,1);
220 s->state=new_state;
221 }
222 }
223 end:
224 s->in_handshake--;
225 if (cb != NULL)
226 cb(s,SSL_CB_ACCEPT_EXIT,ret);
227 return(ret);
228 }
229
230
ssl23_get_client_hello(SSL * s)231 int ssl23_get_client_hello(SSL *s)
232 {
233 char buf_space[11]; /* Request this many bytes in initial read.
234 * We can detect SSL 3.0/TLS 1.0 Client Hellos
235 * ('type == 3') correctly only when the following
236 * is in a single record, which is not guaranteed by
237 * the protocol specification:
238 * Byte Content
239 * 0 type \
240 * 1/2 version > record header
241 * 3/4 length /
242 * 5 msg_type \
243 * 6-8 length > Client Hello message
244 * 9/10 client_version /
245 */
246 char *buf= &(buf_space[0]);
247 unsigned char *p,*d,*d_len,*dd;
248 unsigned int i;
249 unsigned int csl,sil,cl;
250 int n=0,j;
251 int type=0;
252 int v[2];
253
254 if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
255 {
256 /* read the initial header */
257 v[0]=v[1]=0;
258
259 if (!ssl3_setup_buffers(s)) goto err;
260
261 n=ssl23_read_bytes(s, sizeof buf_space);
262 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
263
264 p=s->packet;
265
266 memcpy(buf,p,n);
267
268 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
269 {
270 /*
271 * SSLv2 header
272 */
273 if ((p[3] == 0x00) && (p[4] == 0x02))
274 {
275 v[0]=p[3]; v[1]=p[4];
276 /* SSLv2 */
277 if (!(s->options & SSL_OP_NO_SSLv2))
278 type=1;
279 }
280 else if (p[3] == SSL3_VERSION_MAJOR)
281 {
282 v[0]=p[3]; v[1]=p[4];
283 /* SSLv3/TLSv1 */
284 if (p[4] >= TLS1_VERSION_MINOR)
285 {
286 if (!(s->options & SSL_OP_NO_TLSv1))
287 {
288 s->version=TLS1_VERSION;
289 /* type=2; */ /* done later to survive restarts */
290 s->state=SSL23_ST_SR_CLNT_HELLO_B;
291 }
292 else if (!(s->options & SSL_OP_NO_SSLv3))
293 {
294 s->version=SSL3_VERSION;
295 /* type=2; */
296 s->state=SSL23_ST_SR_CLNT_HELLO_B;
297 }
298 else if (!(s->options & SSL_OP_NO_SSLv2))
299 {
300 type=1;
301 }
302 }
303 else if (!(s->options & SSL_OP_NO_SSLv3))
304 {
305 s->version=SSL3_VERSION;
306 /* type=2; */
307 s->state=SSL23_ST_SR_CLNT_HELLO_B;
308 }
309 else if (!(s->options & SSL_OP_NO_SSLv2))
310 type=1;
311
312 }
313 }
314 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
315 (p[1] == SSL3_VERSION_MAJOR) &&
316 (p[5] == SSL3_MT_CLIENT_HELLO) &&
317 ((p[3] == 0 && p[4] < 5 /* silly record length? */)
318 || (p[9] == p[1])))
319 {
320 /*
321 * SSLv3 or tls1 header
322 */
323
324 v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
325 /* We must look at client_version inside the Client Hello message
326 * to get the correct minor version.
327 * However if we have only a pathologically small fragment of the
328 * Client Hello message, this would be difficult, and we'd have
329 * to read more records to find out.
330 * No known SSL 3.0 client fragments ClientHello like this,
331 * so we simply assume TLS 1.0 to avoid protocol version downgrade
332 * attacks. */
333 if (p[3] == 0 && p[4] < 6)
334 {
335 #if 0
336 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
337 goto err;
338 #else
339 v[1] = TLS1_VERSION_MINOR;
340 #endif
341 }
342 else
343 v[1]=p[10]; /* minor version according to client_version */
344 if (v[1] >= TLS1_VERSION_MINOR)
345 {
346 if (!(s->options & SSL_OP_NO_TLSv1))
347 {
348 s->version=TLS1_VERSION;
349 type=3;
350 }
351 else if (!(s->options & SSL_OP_NO_SSLv3))
352 {
353 s->version=SSL3_VERSION;
354 type=3;
355 }
356 }
357 else
358 {
359 /* client requests SSL 3.0 */
360 if (!(s->options & SSL_OP_NO_SSLv3))
361 {
362 s->version=SSL3_VERSION;
363 type=3;
364 }
365 else if (!(s->options & SSL_OP_NO_TLSv1))
366 {
367 /* we won't be able to use TLS of course,
368 * but this will send an appropriate alert */
369 s->version=TLS1_VERSION;
370 type=3;
371 }
372 }
373 }
374 else if ((strncmp("GET ", (char *)p,4) == 0) ||
375 (strncmp("POST ",(char *)p,5) == 0) ||
376 (strncmp("HEAD ",(char *)p,5) == 0) ||
377 (strncmp("PUT ", (char *)p,4) == 0))
378 {
379 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
380 goto err;
381 }
382 else if (strncmp("CONNECT",(char *)p,7) == 0)
383 {
384 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
385 goto err;
386 }
387 }
388
389 #ifdef OPENSSL_FIPS
390 if (FIPS_mode() && (s->version < TLS1_VERSION))
391 {
392 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
393 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
394 goto err;
395 }
396 #endif
397
398 if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
399 {
400 /* we have SSLv3/TLSv1 in an SSLv2 header
401 * (other cases skip this state) */
402
403 type=2;
404 p=s->packet;
405 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
406 v[1] = p[4];
407
408 n=((p[0]&0x7f)<<8)|p[1];
409 if (n > (1024*4))
410 {
411 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
412 goto err;
413 }
414
415 j=ssl23_read_bytes(s,n+2);
416 if (j <= 0) return(j);
417
418 ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
419 if (s->msg_callback)
420 s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
421
422 p=s->packet;
423 p+=5;
424 n2s(p,csl);
425 n2s(p,sil);
426 n2s(p,cl);
427 d=(unsigned char *)s->init_buf->data;
428 if ((csl+sil+cl+11) != s->packet_length)
429 {
430 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
431 goto err;
432 }
433
434 /* record header: msg_type ... */
435 *(d++) = SSL3_MT_CLIENT_HELLO;
436 /* ... and length (actual value will be written later) */
437 d_len = d;
438 d += 3;
439
440 /* client_version */
441 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
442 *(d++) = v[1];
443
444 /* lets populate the random area */
445 /* get the challenge_length */
446 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
447 memset(d,0,SSL3_RANDOM_SIZE);
448 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
449 d+=SSL3_RANDOM_SIZE;
450
451 /* no session-id reuse */
452 *(d++)=0;
453
454 /* ciphers */
455 j=0;
456 dd=d;
457 d+=2;
458 for (i=0; i<csl; i+=3)
459 {
460 if (p[i] != 0) continue;
461 *(d++)=p[i+1];
462 *(d++)=p[i+2];
463 j+=2;
464 }
465 s2n(j,dd);
466
467 /* COMPRESSION */
468 *(d++)=1;
469 *(d++)=0;
470
471 i = (d-(unsigned char *)s->init_buf->data) - 4;
472 l2n3((long)i, d_len);
473
474 /* get the data reused from the init_buf */
475 s->s3->tmp.reuse_message=1;
476 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
477 s->s3->tmp.message_size=i;
478 }
479
480 /* imaginary new state (for program structure): */
481 /* s->state = SSL23_SR_CLNT_HELLO_C */
482
483 if (type == 1)
484 {
485 #ifdef OPENSSL_NO_SSL2
486 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
487 goto err;
488 #else
489 /* we are talking sslv2 */
490 /* we need to clean up the SSLv3/TLSv1 setup and put in the
491 * sslv2 stuff. */
492
493 if (s->s2 == NULL)
494 {
495 if (!ssl2_new(s))
496 goto err;
497 }
498 else
499 ssl2_clear(s);
500
501 if (s->s3 != NULL) ssl3_free(s);
502
503 if (!BUF_MEM_grow_clean(s->init_buf,
504 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
505 {
506 goto err;
507 }
508
509 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
510 if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3)
511 s->s2->ssl2_rollback=0;
512 else
513 /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
514 * (SSL 3.0 draft/RFC 2246, App. E.2) */
515 s->s2->ssl2_rollback=1;
516
517 /* setup the n bytes we have read so we get them from
518 * the sslv2 buffer */
519 s->rstate=SSL_ST_READ_HEADER;
520 s->packet_length=n;
521 s->packet= &(s->s2->rbuf[0]);
522 memcpy(s->packet,buf,n);
523 s->s2->rbuf_left=n;
524 s->s2->rbuf_offs=0;
525
526 s->method=SSLv2_server_method();
527 s->handshake_func=s->method->ssl_accept;
528 #endif
529 }
530
531 if ((type == 2) || (type == 3))
532 {
533 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
534
535 if (!ssl_init_wbio_buffer(s,1)) goto err;
536
537 /* we are in this state */
538 s->state=SSL3_ST_SR_CLNT_HELLO_A;
539
540 if (type == 3)
541 {
542 /* put the 'n' bytes we have read into the input buffer
543 * for SSLv3 */
544 s->rstate=SSL_ST_READ_HEADER;
545 s->packet_length=n;
546 s->packet= &(s->s3->rbuf.buf[0]);
547 memcpy(s->packet,buf,n);
548 s->s3->rbuf.left=n;
549 s->s3->rbuf.offset=0;
550 }
551 else
552 {
553 s->packet_length=0;
554 s->s3->rbuf.left=0;
555 s->s3->rbuf.offset=0;
556 }
557
558 if (s->version == TLS1_VERSION)
559 s->method = TLSv1_server_method();
560 else
561 s->method = SSLv3_server_method();
562 #if 0 /* ssl3_get_client_hello does this */
563 s->client_version=(v[0]<<8)|v[1];
564 #endif
565 s->handshake_func=s->method->ssl_accept;
566 }
567
568 if ((type < 1) || (type > 3))
569 {
570 /* bad, very bad */
571 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
572 goto err;
573 }
574 s->init_num=0;
575
576 if (buf != buf_space) OPENSSL_free(buf);
577 return(SSL_accept(s));
578 err:
579 if (buf != buf_space) OPENSSL_free(buf);
580 return(-1);
581 }
582