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root/src/vendor-crypto/openssl/dist/ssl/s23_srvr.c
Revision: 6969
Committed: Sat Mar 7 00:07:49 2015 UTC (9 years, 2 months ago) by laffer1
Content type: text/plain
File size: 17609 byte(s)
Log Message:
Vendor import of OpenSSL 0.9.8ze

File Contents

# Content
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 #ifndef OPENSSL_NO_SSL3
128 if (ver == SSL3_VERSION)
129 return(SSLv3_server_method());
130 #endif
131 if (ver == TLS1_VERSION)
132 return(TLSv1_server_method());
133 else
134 return(NULL);
135 }
136
137 IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
138 ssl23_accept,
139 ssl_undefined_function,
140 ssl23_get_server_method)
141
142 int ssl23_accept(SSL *s)
143 {
144 BUF_MEM *buf;
145 unsigned long Time=(unsigned long)time(NULL);
146 void (*cb)(const SSL *ssl,int type,int val)=NULL;
147 int ret= -1;
148 int new_state,state;
149
150 RAND_add(&Time,sizeof(Time),0);
151 ERR_clear_error();
152 clear_sys_error();
153
154 if (s->info_callback != NULL)
155 cb=s->info_callback;
156 else if (s->ctx->info_callback != NULL)
157 cb=s->ctx->info_callback;
158
159 s->in_handshake++;
160 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
161
162 for (;;)
163 {
164 state=s->state;
165
166 switch(s->state)
167 {
168 case SSL_ST_BEFORE:
169 case SSL_ST_ACCEPT:
170 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
171 case SSL_ST_OK|SSL_ST_ACCEPT:
172
173 s->server=1;
174 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
175
176 /* s->version=SSL3_VERSION; */
177 s->type=SSL_ST_ACCEPT;
178
179 if (s->init_buf == NULL)
180 {
181 if ((buf=BUF_MEM_new()) == NULL)
182 {
183 ret= -1;
184 goto end;
185 }
186 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
187 {
188 ret= -1;
189 goto end;
190 }
191 s->init_buf=buf;
192 }
193
194 ssl3_init_finished_mac(s);
195
196 s->state=SSL23_ST_SR_CLNT_HELLO_A;
197 s->ctx->stats.sess_accept++;
198 s->init_num=0;
199 break;
200
201 case SSL23_ST_SR_CLNT_HELLO_A:
202 case SSL23_ST_SR_CLNT_HELLO_B:
203
204 s->shutdown=0;
205 ret=ssl23_get_client_hello(s);
206 if (ret >= 0) cb=NULL;
207 goto end;
208 /* break; */
209
210 default:
211 SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
212 ret= -1;
213 goto end;
214 /* break; */
215 }
216
217 if ((cb != NULL) && (s->state != state))
218 {
219 new_state=s->state;
220 s->state=state;
221 cb(s,SSL_CB_ACCEPT_LOOP,1);
222 s->state=new_state;
223 }
224 }
225 end:
226 s->in_handshake--;
227 if (cb != NULL)
228 cb(s,SSL_CB_ACCEPT_EXIT,ret);
229 return(ret);
230 }
231
232
233 int ssl23_get_client_hello(SSL *s)
234 {
235 char buf_space[11]; /* Request this many bytes in initial read.
236 * We can detect SSL 3.0/TLS 1.0 Client Hellos
237 * ('type == 3') correctly only when the following
238 * is in a single record, which is not guaranteed by
239 * the protocol specification:
240 * Byte Content
241 * 0 type \
242 * 1/2 version > record header
243 * 3/4 length /
244 * 5 msg_type \
245 * 6-8 length > Client Hello message
246 * 9/10 client_version /
247 */
248 char *buf= &(buf_space[0]);
249 unsigned char *p,*d,*d_len,*dd;
250 unsigned int i;
251 unsigned int csl,sil,cl;
252 int n=0,j;
253 int type=0;
254 int v[2];
255
256 if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
257 {
258 /* read the initial header */
259 v[0]=v[1]=0;
260
261 if (!ssl3_setup_buffers(s)) goto err;
262
263 n=ssl23_read_bytes(s, sizeof buf_space);
264 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
265
266 p=s->packet;
267
268 memcpy(buf,p,n);
269
270 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
271 {
272 /*
273 * SSLv2 header
274 */
275 if ((p[3] == 0x00) && (p[4] == 0x02))
276 {
277 v[0]=p[3]; v[1]=p[4];
278 /* SSLv2 */
279 if (!(s->options & SSL_OP_NO_SSLv2))
280 type=1;
281 }
282 else if (p[3] == SSL3_VERSION_MAJOR)
283 {
284 v[0]=p[3]; v[1]=p[4];
285 /* SSLv3/TLSv1 */
286 if (p[4] >= TLS1_VERSION_MINOR)
287 {
288 if (!(s->options & SSL_OP_NO_TLSv1))
289 {
290 s->version=TLS1_VERSION;
291 /* type=2; */ /* done later to survive restarts */
292 s->state=SSL23_ST_SR_CLNT_HELLO_B;
293 }
294 else if (!(s->options & SSL_OP_NO_SSLv3))
295 {
296 s->version=SSL3_VERSION;
297 /* type=2; */
298 s->state=SSL23_ST_SR_CLNT_HELLO_B;
299 }
300 else if (!(s->options & SSL_OP_NO_SSLv2))
301 {
302 type=1;
303 }
304 }
305 else if (!(s->options & SSL_OP_NO_SSLv3))
306 {
307 s->version=SSL3_VERSION;
308 /* type=2; */
309 s->state=SSL23_ST_SR_CLNT_HELLO_B;
310 }
311 else if (!(s->options & SSL_OP_NO_SSLv2))
312 type=1;
313
314 }
315 }
316 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
317 (p[1] == SSL3_VERSION_MAJOR) &&
318 (p[5] == SSL3_MT_CLIENT_HELLO) &&
319 ((p[3] == 0 && p[4] < 5 /* silly record length? */)
320 || (p[9] >= p[1])))
321 {
322 /*
323 * SSLv3 or tls1 header
324 */
325
326 v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
327 /* We must look at client_version inside the Client Hello message
328 * to get the correct minor version.
329 * However if we have only a pathologically small fragment of the
330 * Client Hello message, this would be difficult, and we'd have
331 * to read more records to find out.
332 * No known SSL 3.0 client fragments ClientHello like this,
333 * so we simply reject such connections to avoid
334 * protocol version downgrade attacks. */
335 if (p[3] == 0 && p[4] < 6)
336 {
337 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
338 goto err;
339 }
340 /* if major version number > 3 set minor to a value
341 * which will use the highest version 3 we support.
342 * If TLS 2.0 ever appears we will need to revise
343 * this....
344 */
345 if (p[9] > SSL3_VERSION_MAJOR)
346 v[1]=0xff;
347 else
348 v[1]=p[10]; /* minor version according to client_version */
349 if (v[1] >= TLS1_VERSION_MINOR)
350 {
351 if (!(s->options & SSL_OP_NO_TLSv1))
352 {
353 s->version=TLS1_VERSION;
354 type=3;
355 }
356 else if (!(s->options & SSL_OP_NO_SSLv3))
357 {
358 s->version=SSL3_VERSION;
359 type=3;
360 }
361 }
362 else
363 {
364 /* client requests SSL 3.0 */
365 if (!(s->options & SSL_OP_NO_SSLv3))
366 {
367 s->version=SSL3_VERSION;
368 type=3;
369 }
370 else if (!(s->options & SSL_OP_NO_TLSv1))
371 {
372 /* we won't be able to use TLS of course,
373 * but this will send an appropriate alert */
374 s->version=TLS1_VERSION;
375 type=3;
376 }
377 }
378 }
379 else if ((strncmp("GET ", (char *)p,4) == 0) ||
380 (strncmp("POST ",(char *)p,5) == 0) ||
381 (strncmp("HEAD ",(char *)p,5) == 0) ||
382 (strncmp("PUT ", (char *)p,4) == 0))
383 {
384 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
385 goto err;
386 }
387 else if (strncmp("CONNECT",(char *)p,7) == 0)
388 {
389 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
390 goto err;
391 }
392 }
393
394 #ifdef OPENSSL_FIPS
395 if (FIPS_mode() && (s->version < TLS1_VERSION))
396 {
397 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
398 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
399 goto err;
400 }
401 #endif
402
403 /* ensure that TLS_MAX_VERSION is up-to-date */
404 OPENSSL_assert(s->version <= TLS_MAX_VERSION);
405
406 if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
407 {
408 /* we have SSLv3/TLSv1 in an SSLv2 header
409 * (other cases skip this state) */
410
411 type=2;
412 p=s->packet;
413 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
414 v[1] = p[4];
415
416 /* An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
417 * header is sent directly on the wire, not wrapped as a TLS
418 * record. It's format is:
419 * Byte Content
420 * 0-1 msg_length
421 * 2 msg_type
422 * 3-4 version
423 * 5-6 cipher_spec_length
424 * 7-8 session_id_length
425 * 9-10 challenge_length
426 * ... ...
427 */
428 n=((p[0]&0x7f)<<8)|p[1];
429 if (n > (1024*4))
430 {
431 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
432 goto err;
433 }
434 if (n < 9)
435 {
436 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
437 goto err;
438 }
439
440 j=ssl23_read_bytes(s,n+2);
441 /* We previously read 11 bytes, so if j > 0, we must have
442 * j == n+2 == s->packet_length. We have at least 11 valid
443 * packet bytes. */
444 if (j <= 0) return(j);
445
446 ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
447 if (s->msg_callback)
448 s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
449
450 p=s->packet;
451 p+=5;
452 n2s(p,csl);
453 n2s(p,sil);
454 n2s(p,cl);
455 d=(unsigned char *)s->init_buf->data;
456 if ((csl+sil+cl+11) != s->packet_length)
457 {
458 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
459 goto err;
460 }
461
462 /* record header: msg_type ... */
463 *(d++) = SSL3_MT_CLIENT_HELLO;
464 /* ... and length (actual value will be written later) */
465 d_len = d;
466 d += 3;
467
468 /* client_version */
469 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
470 *(d++) = v[1];
471
472 /* lets populate the random area */
473 /* get the challenge_length */
474 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
475 memset(d,0,SSL3_RANDOM_SIZE);
476 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
477 d+=SSL3_RANDOM_SIZE;
478
479 /* no session-id reuse */
480 *(d++)=0;
481
482 /* ciphers */
483 j=0;
484 dd=d;
485 d+=2;
486 for (i=0; i<csl; i+=3)
487 {
488 if (p[i] != 0) continue;
489 *(d++)=p[i+1];
490 *(d++)=p[i+2];
491 j+=2;
492 }
493 s2n(j,dd);
494
495 /* COMPRESSION */
496 *(d++)=1;
497 *(d++)=0;
498
499 i = (d-(unsigned char *)s->init_buf->data) - 4;
500 l2n3((long)i, d_len);
501
502 /* get the data reused from the init_buf */
503 s->s3->tmp.reuse_message=1;
504 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
505 s->s3->tmp.message_size=i;
506 }
507
508 /* imaginary new state (for program structure): */
509 /* s->state = SSL23_SR_CLNT_HELLO_C */
510
511 if (type == 1)
512 {
513 #ifdef OPENSSL_NO_SSL2
514 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
515 goto err;
516 #else
517 /* we are talking sslv2 */
518 /* we need to clean up the SSLv3/TLSv1 setup and put in the
519 * sslv2 stuff. */
520
521 if (s->s2 == NULL)
522 {
523 if (!ssl2_new(s))
524 goto err;
525 }
526 else
527 ssl2_clear(s);
528
529 if (s->s3 != NULL) ssl3_free(s);
530
531 if (!BUF_MEM_grow_clean(s->init_buf,
532 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
533 {
534 goto err;
535 }
536
537 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
538 if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3)
539 s->s2->ssl2_rollback=0;
540 else
541 /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
542 * (SSL 3.0 draft/RFC 2246, App. E.2) */
543 s->s2->ssl2_rollback=1;
544
545 /* setup the n bytes we have read so we get them from
546 * the sslv2 buffer */
547 s->rstate=SSL_ST_READ_HEADER;
548 s->packet_length=n;
549 s->packet= &(s->s2->rbuf[0]);
550 memcpy(s->packet,buf,n);
551 s->s2->rbuf_left=n;
552 s->s2->rbuf_offs=0;
553
554 s->method=SSLv2_server_method();
555 s->handshake_func=s->method->ssl_accept;
556 #endif
557 }
558
559 if ((type == 2) || (type == 3))
560 {
561 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
562 SSL_METHOD *new_method;
563 new_method = ssl23_get_server_method(s->version);
564 if (new_method == NULL)
565 {
566 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
567 goto err;
568 }
569 s->method = new_method;
570
571 if (!ssl_init_wbio_buffer(s,1)) goto err;
572
573 /* we are in this state */
574 s->state=SSL3_ST_SR_CLNT_HELLO_A;
575
576 if (type == 3)
577 {
578 /* put the 'n' bytes we have read into the input buffer
579 * for SSLv3 */
580 s->rstate=SSL_ST_READ_HEADER;
581 s->packet_length=n;
582 s->packet= &(s->s3->rbuf.buf[0]);
583 memcpy(s->packet,buf,n);
584 s->s3->rbuf.left=n;
585 s->s3->rbuf.offset=0;
586 }
587 else
588 {
589 s->packet_length=0;
590 s->s3->rbuf.left=0;
591 s->s3->rbuf.offset=0;
592 }
593 #if 0 /* ssl3_get_client_hello does this */
594 s->client_version=(v[0]<<8)|v[1];
595 #endif
596 s->handshake_func=s->method->ssl_accept;
597 }
598
599 if ((type < 1) || (type > 3))
600 {
601 /* bad, very bad */
602 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
603 goto err;
604 }
605 s->init_num=0;
606
607 if (buf != buf_space) OPENSSL_free(buf);
608 return(SSL_accept(s));
609 err:
610 if (buf != buf_space) OPENSSL_free(buf);
611 return(-1);
612 }