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Import OpenSSL-0.9.8i.
[dragonfly.git] / crypto / openssl-0.9.7d / ssl / s23_srvr.c
blobc5404ca0bcd4c015f0273f38e22ef07bffb92585
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);
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
135 SSL_METHOD *SSLv23_server_method(void)
136 {
137 static int init=1;
138 static SSL_METHOD SSLv23_server_data;
139
140 if (init)
141 {
142 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
143
144 if (init)
145 {
146 memcpy((char *)&SSLv23_server_data,
147 (char *)sslv23_base_method(),sizeof(SSL_METHOD));
148 SSLv23_server_data.ssl_accept=ssl23_accept;
149 SSLv23_server_data.get_ssl_method=ssl23_get_server_method;
150 init=0;
151 }
152
153 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
154 }
155 return(&SSLv23_server_data);
156 }
157
158 int ssl23_accept(SSL *s)
159 {
160 BUF_MEM *buf;
161 unsigned long Time=time(NULL);
162 void (*cb)(const SSL *ssl,int type,int val)=NULL;
163 int ret= -1;
164 int new_state,state;
165
166 RAND_add(&Time,sizeof(Time),0);
167 ERR_clear_error();
168 clear_sys_error();
169
170 if (s->info_callback != NULL)
171 cb=s->info_callback;
172 else if (s->ctx->info_callback != NULL)
173 cb=s->ctx->info_callback;
174
175 s->in_handshake++;
176 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
177
178 for (;;)
179 {
180 state=s->state;
181
182 switch(s->state)
183 {
184 case SSL_ST_BEFORE:
185 case SSL_ST_ACCEPT:
186 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
187 case SSL_ST_OK|SSL_ST_ACCEPT:
188
189 s->server=1;
190 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
191
192 /* s->version=SSL3_VERSION; */
193 s->type=SSL_ST_ACCEPT;
194
195 if (s->init_buf == NULL)
196 {
197 if ((buf=BUF_MEM_new()) == NULL)
198 {
199 ret= -1;
200 goto end;
201 }
202 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
203 {
204 ret= -1;
205 goto end;
206 }
207 s->init_buf=buf;
208 }
209
210 ssl3_init_finished_mac(s);
211
212 s->state=SSL23_ST_SR_CLNT_HELLO_A;
213 s->ctx->stats.sess_accept++;
214 s->init_num=0;
215 break;
216
217 case SSL23_ST_SR_CLNT_HELLO_A:
218 case SSL23_ST_SR_CLNT_HELLO_B:
219
220 s->shutdown=0;
221 ret=ssl23_get_client_hello(s);
222 if (ret >= 0) cb=NULL;
223 goto end;
224 /* break; */
225
226 default:
227 SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
228 ret= -1;
229 goto end;
230 /* break; */
231 }
232
233 if ((cb != NULL) && (s->state != state))
234 {
235 new_state=s->state;
236 s->state=state;
237 cb(s,SSL_CB_ACCEPT_LOOP,1);
238 s->state=new_state;
239 }
240 }
241 end:
242 s->in_handshake--;
243 if (cb != NULL)
244 cb(s,SSL_CB_ACCEPT_EXIT,ret);
245 return(ret);
246 }
247
248
249 int ssl23_get_client_hello(SSL *s)
250 {
251 char buf_space[11]; /* Request this many bytes in initial read.
252 * We can detect SSL 3.0/TLS 1.0 Client Hellos
253 * ('type == 3') correctly only when the following
254 * is in a single record, which is not guaranteed by
255 * the protocol specification:
256 * Byte Content
257 * 0 type \
258 * 1/2 version > record header
259 * 3/4 length /
260 * 5 msg_type \
261 * 6-8 length > Client Hello message
262 * 9/10 client_version /
263 */
264 char *buf= &(buf_space[0]);
265 unsigned char *p,*d,*d_len,*dd;
266 unsigned int i;
267 unsigned int csl,sil,cl;
268 int n=0,j;
269 int type=0;
270 int v[2];
271 #ifndef OPENSSL_NO_RSA
272 int use_sslv2_strong=0;
273 #endif
274
275 if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
276 {
277 /* read the initial header */
278 v[0]=v[1]=0;
279
280 if (!ssl3_setup_buffers(s)) goto err;
281
282 n=ssl23_read_bytes(s, sizeof buf_space);
283 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
284
285 p=s->packet;
286
287 memcpy(buf,p,n);
288
289 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
290 {
291 /*
292 * SSLv2 header
293 */
294 if ((p[3] == 0x00) && (p[4] == 0x02))
295 {
296 v[0]=p[3]; v[1]=p[4];
297 /* SSLv2 */
298 if (!(s->options & SSL_OP_NO_SSLv2))
299 type=1;
300 }
301 else if (p[3] == SSL3_VERSION_MAJOR)
302 {
303 v[0]=p[3]; v[1]=p[4];
304 /* SSLv3/TLSv1 */
305 if (p[4] >= TLS1_VERSION_MINOR)
306 {
307 if (!(s->options & SSL_OP_NO_TLSv1))
308 {
309 s->version=TLS1_VERSION;
310 /* type=2; */ /* done later to survive restarts */
311 s->state=SSL23_ST_SR_CLNT_HELLO_B;
312 }
313 else if (!(s->options & SSL_OP_NO_SSLv3))
314 {
315 s->version=SSL3_VERSION;
316 /* type=2; */
317 s->state=SSL23_ST_SR_CLNT_HELLO_B;
318 }
319 else if (!(s->options & SSL_OP_NO_SSLv2))
320 {
321 type=1;
322 }
323 }
324 else if (!(s->options & SSL_OP_NO_SSLv3))
325 {
326 s->version=SSL3_VERSION;
327 /* type=2; */
328 s->state=SSL23_ST_SR_CLNT_HELLO_B;
329 }
330 else if (!(s->options & SSL_OP_NO_SSLv2))
331 type=1;
332
333 }
334 }
335 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
336 (p[1] == SSL3_VERSION_MAJOR) &&
337 (p[5] == SSL3_MT_CLIENT_HELLO) &&
338 ((p[3] == 0 && p[4] < 5 /* silly record length? */)
339 || (p[9] == p[1])))
340 {
341 /*
342 * SSLv3 or tls1 header
343 */
344
345 v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
346 /* We must look at client_version inside the Client Hello message
347 * to get the correct minor version.
348 * However if we have only a pathologically small fragment of the
349 * Client Hello message, this would be difficult, and we'd have
350 * to read more records to find out.
351 * No known SSL 3.0 client fragments ClientHello like this,
352 * so we simply assume TLS 1.0 to avoid protocol version downgrade
353 * attacks. */
354 if (p[3] == 0 && p[4] < 6)
355 {
356 #if 0
357 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
358 goto err;
359 #else
360 v[1] = TLS1_VERSION_MINOR;
361 #endif
362 }
363 else
364 v[1]=p[10]; /* minor version according to client_version */
365 if (v[1] >= TLS1_VERSION_MINOR)
366 {
367 if (!(s->options & SSL_OP_NO_TLSv1))
368 {
369 s->version=TLS1_VERSION;
370 type=3;
371 }
372 else if (!(s->options & SSL_OP_NO_SSLv3))
373 {
374 s->version=SSL3_VERSION;
375 type=3;
376 }
377 }
378 else
379 {
380 /* client requests SSL 3.0 */
381 if (!(s->options & SSL_OP_NO_SSLv3))
382 {
383 s->version=SSL3_VERSION;
384 type=3;
385 }
386 else if (!(s->options & SSL_OP_NO_TLSv1))
387 {
388 /* we won't be able to use TLS of course,
389 * but this will send an appropriate alert */
390 s->version=TLS1_VERSION;
391 type=3;
392 }
393 }
394 }
395 else if ((strncmp("GET ", (char *)p,4) == 0) ||
396 (strncmp("POST ",(char *)p,5) == 0) ||
397 (strncmp("HEAD ",(char *)p,5) == 0) ||
398 (strncmp("PUT ", (char *)p,4) == 0))
399 {
400 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
401 goto err;
402 }
403 else if (strncmp("CONNECT",(char *)p,7) == 0)
404 {
405 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
406 goto err;
407 }
408 }
409
410 if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
411 {
412 /* we have SSLv3/TLSv1 in an SSLv2 header
413 * (other cases skip this state) */
414
415 type=2;
416 p=s->packet;
417 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
418 v[1] = p[4];
419
420 n=((p[0]&0x7f)<<8)|p[1];
421 if (n > (1024*4))
422 {
423 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
424 goto err;
425 }
426
427 j=ssl23_read_bytes(s,n+2);
428 if (j <= 0) return(j);
429
430 ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
431 if (s->msg_callback)
432 s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
433
434 p=s->packet;
435 p+=5;
436 n2s(p,csl);
437 n2s(p,sil);
438 n2s(p,cl);
439 d=(unsigned char *)s->init_buf->data;
440 if ((csl+sil+cl+11) != s->packet_length)
441 {
442 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
443 goto err;
444 }
445
446 /* record header: msg_type ... */
447 *(d++) = SSL3_MT_CLIENT_HELLO;
448 /* ... and length (actual value will be written later) */
449 d_len = d;
450 d += 3;
451
452 /* client_version */
453 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
454 *(d++) = v[1];
455
456 /* lets populate the random area */
457 /* get the challenge_length */
458 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
459 memset(d,0,SSL3_RANDOM_SIZE);
460 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
461 d+=SSL3_RANDOM_SIZE;
462
463 /* no session-id reuse */
464 *(d++)=0;
465
466 /* ciphers */
467 j=0;
468 dd=d;
469 d+=2;
470 for (i=0; i<csl; i+=3)
471 {
472 if (p[i] != 0) continue;
473 *(d++)=p[i+1];
474 *(d++)=p[i+2];
475 j+=2;
476 }
477 s2n(j,dd);
478
479 /* COMPRESSION */
480 *(d++)=1;
481 *(d++)=0;
482
483 i = (d-(unsigned char *)s->init_buf->data) - 4;
484 l2n3((long)i, d_len);
485
486 /* get the data reused from the init_buf */
487 s->s3->tmp.reuse_message=1;
488 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
489 s->s3->tmp.message_size=i;
490 }
491
492 /* imaginary new state (for program structure): */
493 /* s->state = SSL23_SR_CLNT_HELLO_C */
494
495 if (type == 1)
496 {
497 #ifdef OPENSSL_NO_SSL2
498 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
499 goto err;
500 #else
501 /* we are talking sslv2 */
502 /* we need to clean up the SSLv3/TLSv1 setup and put in the
503 * sslv2 stuff. */
504
505 if (s->s2 == NULL)
506 {
507 if (!ssl2_new(s))
508 goto err;
509 }
510 else
511 ssl2_clear(s);
512
513 if (s->s3 != NULL) ssl3_free(s);
514
515 if (!BUF_MEM_grow_clean(s->init_buf,
516 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
517 {
518 goto err;
519 }
520
521 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
522 if ((s->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
523 use_sslv2_strong ||
524 (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3))
525 s->s2->ssl2_rollback=0;
526 else
527 /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
528 * (SSL 3.0 draft/RFC 2246, App. E.2) */
529 s->s2->ssl2_rollback=1;
530
531 /* setup the n bytes we have read so we get them from
532 * the sslv2 buffer */
533 s->rstate=SSL_ST_READ_HEADER;
534 s->packet_length=n;
535 s->packet= &(s->s2->rbuf[0]);
536 memcpy(s->packet,buf,n);
537 s->s2->rbuf_left=n;
538 s->s2->rbuf_offs=0;
539
540 s->method=SSLv2_server_method();
541 s->handshake_func=s->method->ssl_accept;
542 #endif
543 }
544
545 if ((type == 2) || (type == 3))
546 {
547 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
548
549 if (!ssl_init_wbio_buffer(s,1)) goto err;
550
551 /* we are in this state */
552 s->state=SSL3_ST_SR_CLNT_HELLO_A;
553
554 if (type == 3)
555 {
556 /* put the 'n' bytes we have read into the input buffer
557 * for SSLv3 */
558 s->rstate=SSL_ST_READ_HEADER;
559 s->packet_length=n;
560 s->packet= &(s->s3->rbuf.buf[0]);
561 memcpy(s->packet,buf,n);
562 s->s3->rbuf.left=n;
563 s->s3->rbuf.offset=0;
564 }
565 else
566 {
567 s->packet_length=0;
568 s->s3->rbuf.left=0;
569 s->s3->rbuf.offset=0;
570 }
571
572 if (s->version == TLS1_VERSION)
573 s->method = TLSv1_server_method();
574 else
575 s->method = SSLv3_server_method();
576 #if 0 /* ssl3_get_client_hello does this */
577 s->client_version=(v[0]<<8)|v[1];
578 #endif
579 s->handshake_func=s->method->ssl_accept;
580 }
581
582 if ((type < 1) || (type > 3))
583 {
584 /* bad, very bad */
585 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
586 goto err;
587 }
588 s->init_num=0;
589
590 if (buf != buf_space) OPENSSL_free(buf);
591 s->first_packet=1;
592 return(SSL_accept(s));
593 err:
594 if (buf != buf_space) OPENSSL_free(buf);
595 return(-1);
596 }
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