1 /* ssl/s23_clnt.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 #include <stdio.h>
60 #include "ssl_locl.h"
61 #include <openssl/buffer.h>
62 #include <openssl/rand.h>
63 #include <openssl/objects.h>
64 #include <openssl/evp.h>
65
66 static SSL_METHOD *ssl23_get_client_method(int ver);
67 static int ssl23_client_hello(SSL *s);
68 static int ssl23_get_server_hello(SSL *s);
ssl23_get_client_method(int ver)69 static SSL_METHOD *ssl23_get_client_method(int ver)
70 {
71 #ifndef OPENSSL_NO_SSL2
72 if (ver == SSL2_VERSION)
73 return(SSLv2_client_method());
74 #endif
75 if (ver == SSL3_VERSION)
76 return(SSLv3_client_method());
77 else if (ver == TLS1_VERSION)
78 return(TLSv1_client_method());
79 else
80 return(NULL);
81 }
82
IMPLEMENT_ssl23_meth_func(SSLv23_client_method,ssl_undefined_function,ssl23_connect,ssl23_get_client_method)83 IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
84 ssl_undefined_function,
85 ssl23_connect,
86 ssl23_get_client_method)
87
88 int ssl23_connect(SSL *s)
89 {
90 BUF_MEM *buf=NULL;
91 unsigned long Time=(unsigned long)time(NULL);
92 void (*cb)(const SSL *ssl,int type,int val)=NULL;
93 int ret= -1;
94 int new_state,state;
95
96 RAND_add(&Time,sizeof(Time),0);
97 ERR_clear_error();
98 clear_sys_error();
99
100 if (s->info_callback != NULL)
101 cb=s->info_callback;
102 else if (s->ctx->info_callback != NULL)
103 cb=s->ctx->info_callback;
104
105 s->in_handshake++;
106 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
107
108 for (;;)
109 {
110 state=s->state;
111
112 switch(s->state)
113 {
114 case SSL_ST_BEFORE:
115 case SSL_ST_CONNECT:
116 case SSL_ST_BEFORE|SSL_ST_CONNECT:
117 case SSL_ST_OK|SSL_ST_CONNECT:
118
119 if (s->session != NULL)
120 {
121 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
122 ret= -1;
123 goto end;
124 }
125 s->server=0;
126 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
127
128 /* s->version=TLS1_VERSION; */
129 s->type=SSL_ST_CONNECT;
130
131 if (s->init_buf == NULL)
132 {
133 if ((buf=BUF_MEM_new()) == NULL)
134 {
135 ret= -1;
136 goto end;
137 }
138 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
139 {
140 ret= -1;
141 goto end;
142 }
143 s->init_buf=buf;
144 buf=NULL;
145 }
146
147 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
148
149 ssl3_init_finished_mac(s);
150
151 s->state=SSL23_ST_CW_CLNT_HELLO_A;
152 s->ctx->stats.sess_connect++;
153 s->init_num=0;
154 break;
155
156 case SSL23_ST_CW_CLNT_HELLO_A:
157 case SSL23_ST_CW_CLNT_HELLO_B:
158
159 s->shutdown=0;
160 ret=ssl23_client_hello(s);
161 if (ret <= 0) goto end;
162 s->state=SSL23_ST_CR_SRVR_HELLO_A;
163 s->init_num=0;
164
165 break;
166
167 case SSL23_ST_CR_SRVR_HELLO_A:
168 case SSL23_ST_CR_SRVR_HELLO_B:
169 ret=ssl23_get_server_hello(s);
170 if (ret >= 0) cb=NULL;
171 goto end;
172 /* break; */
173
174 default:
175 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
176 ret= -1;
177 goto end;
178 /* break; */
179 }
180
181 if (s->debug) { (void)BIO_flush(s->wbio); }
182
183 if ((cb != NULL) && (s->state != state))
184 {
185 new_state=s->state;
186 s->state=state;
187 cb(s,SSL_CB_CONNECT_LOOP,1);
188 s->state=new_state;
189 }
190 }
191 end:
192 s->in_handshake--;
193 if (buf != NULL)
194 BUF_MEM_free(buf);
195 if (cb != NULL)
196 cb(s,SSL_CB_CONNECT_EXIT,ret);
197 return(ret);
198 }
199
200
ssl23_client_hello(SSL * s)201 static int ssl23_client_hello(SSL *s)
202 {
203 unsigned char *buf;
204 unsigned char *p,*d;
205 int i,j,ch_len;
206 unsigned long Time,l;
207 int ssl2_compat;
208 int version = 0, version_major, version_minor;
209 SSL_COMP *comp;
210 int ret;
211
212 ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
213
214 if (!(s->options & SSL_OP_NO_TLSv1))
215 {
216 version = TLS1_VERSION;
217 }
218 else if (!(s->options & SSL_OP_NO_SSLv3))
219 {
220 version = SSL3_VERSION;
221 }
222 else if (!(s->options & SSL_OP_NO_SSLv2))
223 {
224 version = SSL2_VERSION;
225 }
226 #ifndef OPENSSL_NO_TLSEXT
227 if (version != SSL2_VERSION)
228 {
229 /* have to disable SSL 2.0 compatibility if we need TLS extensions */
230
231 if (s->tlsext_hostname != NULL)
232 ssl2_compat = 0;
233 if (s->tlsext_status_type != -1)
234 ssl2_compat = 0;
235 }
236 #endif
237
238 buf=(unsigned char *)s->init_buf->data;
239 if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
240 {
241 #if 0
242 /* don't reuse session-id's */
243 if (!ssl_get_new_session(s,0))
244 {
245 return(-1);
246 }
247 #endif
248
249 p=s->s3->client_random;
250 Time=(unsigned long)time(NULL); /* Time */
251 l2n(Time,p);
252 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
253 return -1;
254
255 if (version == TLS1_VERSION)
256 {
257 version_major = TLS1_VERSION_MAJOR;
258 version_minor = TLS1_VERSION_MINOR;
259 }
260 else if (version == SSL3_VERSION)
261 {
262 version_major = SSL3_VERSION_MAJOR;
263 version_minor = SSL3_VERSION_MINOR;
264 }
265 else if (version == SSL2_VERSION)
266 {
267 version_major = SSL2_VERSION_MAJOR;
268 version_minor = SSL2_VERSION_MINOR;
269 }
270 else
271 {
272 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
273 return(-1);
274 }
275
276 s->client_version = version;
277
278 if (ssl2_compat)
279 {
280 /* create SSL 2.0 compatible Client Hello */
281
282 /* two byte record header will be written last */
283 d = &(buf[2]);
284 p = d + 9; /* leave space for message type, version, individual length fields */
285
286 *(d++) = SSL2_MT_CLIENT_HELLO;
287 *(d++) = version_major;
288 *(d++) = version_minor;
289
290 /* Ciphers supported */
291 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
292 if (i == 0)
293 {
294 /* no ciphers */
295 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
296 return -1;
297 }
298 s2n(i,d);
299 p+=i;
300
301 /* put in the session-id length (zero since there is no reuse) */
302 #if 0
303 s->session->session_id_length=0;
304 #endif
305 s2n(0,d);
306
307 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
308 ch_len=SSL2_CHALLENGE_LENGTH;
309 else
310 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
311
312 /* write out sslv2 challenge */
313 if (SSL3_RANDOM_SIZE < ch_len)
314 i=SSL3_RANDOM_SIZE;
315 else
316 i=ch_len;
317 s2n(i,d);
318 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
319 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
320 return -1;
321
322 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
323 p+=i;
324
325 i= p- &(buf[2]);
326 buf[0]=((i>>8)&0xff)|0x80;
327 buf[1]=(i&0xff);
328
329 /* number of bytes to write */
330 s->init_num=i+2;
331 s->init_off=0;
332
333 ssl3_finish_mac(s,&(buf[2]),i);
334 }
335 else
336 {
337 /* create Client Hello in SSL 3.0/TLS 1.0 format */
338
339 /* do the record header (5 bytes) and handshake message header (4 bytes) last */
340 d = p = &(buf[9]);
341
342 *(p++) = version_major;
343 *(p++) = version_minor;
344
345 /* Random stuff */
346 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
347 p += SSL3_RANDOM_SIZE;
348
349 /* Session ID (zero since there is no reuse) */
350 *(p++) = 0;
351
352 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
353 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
354 if (i == 0)
355 {
356 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
357 return -1;
358 }
359 s2n(i,p);
360 p+=i;
361
362 /* COMPRESSION */
363 if (s->ctx->comp_methods == NULL)
364 j=0;
365 else
366 j=sk_SSL_COMP_num(s->ctx->comp_methods);
367 *(p++)=1+j;
368 for (i=0; i<j; i++)
369 {
370 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
371 *(p++)=comp->id;
372 }
373 *(p++)=0; /* Add the NULL method */
374 #ifndef OPENSSL_NO_TLSEXT
375 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
376 {
377 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
378 return -1;
379 }
380 #endif
381
382 l = p-d;
383 *p = 42;
384
385 /* fill in 4-byte handshake header */
386 d=&(buf[5]);
387 *(d++)=SSL3_MT_CLIENT_HELLO;
388 l2n3(l,d);
389
390 l += 4;
391
392 if (l > SSL3_RT_MAX_PLAIN_LENGTH)
393 {
394 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
395 return -1;
396 }
397
398 /* fill in 5-byte record header */
399 d=buf;
400 *(d++) = SSL3_RT_HANDSHAKE;
401 *(d++) = version_major;
402 *(d++) = version_minor; /* arguably we should send the *lowest* suported version here
403 * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
404 s2n((int)l,d);
405
406 /* number of bytes to write */
407 s->init_num=p-buf;
408 s->init_off=0;
409
410 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
411 }
412
413 s->state=SSL23_ST_CW_CLNT_HELLO_B;
414 s->init_off=0;
415 }
416
417 /* SSL3_ST_CW_CLNT_HELLO_B */
418 ret = ssl23_write_bytes(s);
419
420 if ((ret >= 2) && s->msg_callback)
421 {
422 /* Client Hello has been sent; tell msg_callback */
423
424 if (ssl2_compat)
425 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
426 else
427 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
428 }
429
430 return ret;
431 }
432
ssl23_get_server_hello(SSL * s)433 static int ssl23_get_server_hello(SSL *s)
434 {
435 char buf[8];
436 unsigned char *p;
437 int i;
438 int n;
439
440 n=ssl23_read_bytes(s,7);
441
442 if (n != 7) return(n);
443 p=s->packet;
444
445 memcpy(buf,p,n);
446
447 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
448 (p[5] == 0x00) && (p[6] == 0x02))
449 {
450 #ifdef OPENSSL_NO_SSL2
451 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
452 goto err;
453 #else
454 /* we are talking sslv2 */
455 /* we need to clean up the SSLv3 setup and put in the
456 * sslv2 stuff. */
457 int ch_len;
458
459 if (s->options & SSL_OP_NO_SSLv2)
460 {
461 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
462 goto err;
463 }
464 if (s->s2 == NULL)
465 {
466 if (!ssl2_new(s))
467 goto err;
468 }
469 else
470 ssl2_clear(s);
471
472 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
473 ch_len=SSL2_CHALLENGE_LENGTH;
474 else
475 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
476
477 /* write out sslv2 challenge */
478 i=(SSL3_RANDOM_SIZE < ch_len)
479 ?SSL3_RANDOM_SIZE:ch_len;
480 s->s2->challenge_length=i;
481 memcpy(s->s2->challenge,
482 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
483
484 if (s->s3 != NULL) ssl3_free(s);
485
486 if (!BUF_MEM_grow_clean(s->init_buf,
487 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
488 {
489 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
490 goto err;
491 }
492
493 s->state=SSL2_ST_GET_SERVER_HELLO_A;
494 if (!(s->client_version == SSL2_VERSION))
495 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
496 s->s2->ssl2_rollback=1;
497
498 /* setup the 5 bytes we have read so we get them from
499 * the sslv2 buffer */
500 s->rstate=SSL_ST_READ_HEADER;
501 s->packet_length=n;
502 s->packet= &(s->s2->rbuf[0]);
503 memcpy(s->packet,buf,n);
504 s->s2->rbuf_left=n;
505 s->s2->rbuf_offs=0;
506
507 /* we have already written one */
508 s->s2->write_sequence=1;
509
510 s->method=SSLv2_client_method();
511 s->handshake_func=s->method->ssl_connect;
512 #endif
513 }
514 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
515 (p[1] == SSL3_VERSION_MAJOR) &&
516 ((p[2] == SSL3_VERSION_MINOR) ||
517 (p[2] == TLS1_VERSION_MINOR)) &&
518 (p[5] == SSL3_MT_SERVER_HELLO))
519 {
520 /* we have sslv3 or tls1 */
521
522 if (!ssl_init_wbio_buffer(s,1)) goto err;
523
524 /* we are in this state */
525 s->state=SSL3_ST_CR_SRVR_HELLO_A;
526
527 /* put the 5 bytes we have read into the input buffer
528 * for SSLv3 */
529 s->rstate=SSL_ST_READ_HEADER;
530 s->packet_length=n;
531 s->packet= &(s->s3->rbuf.buf[0]);
532 memcpy(s->packet,buf,n);
533 s->s3->rbuf.left=n;
534 s->s3->rbuf.offset=0;
535
536 if ((p[2] == SSL3_VERSION_MINOR) &&
537 !(s->options & SSL_OP_NO_SSLv3))
538 {
539 s->version=SSL3_VERSION;
540 s->method=SSLv3_client_method();
541 }
542 else if ((p[2] == TLS1_VERSION_MINOR) &&
543 !(s->options & SSL_OP_NO_TLSv1))
544 {
545 s->version=TLS1_VERSION;
546 s->method=TLSv1_client_method();
547 }
548 else
549 {
550 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
551 goto err;
552 }
553
554 s->handshake_func=s->method->ssl_connect;
555 }
556 else if ((p[0] == SSL3_RT_ALERT) &&
557 (p[1] == SSL3_VERSION_MAJOR) &&
558 ((p[2] == SSL3_VERSION_MINOR) ||
559 (p[2] == TLS1_VERSION_MINOR)) &&
560 (p[3] == 0) &&
561 (p[4] == 2))
562 {
563 void (*cb)(const SSL *ssl,int type,int val)=NULL;
564 int j;
565
566 /* An alert */
567 if (s->info_callback != NULL)
568 cb=s->info_callback;
569 else if (s->ctx->info_callback != NULL)
570 cb=s->ctx->info_callback;
571
572 i=p[5];
573 if (cb != NULL)
574 {
575 j=(i<<8)|p[6];
576 cb(s,SSL_CB_READ_ALERT,j);
577 }
578
579 s->rwstate=SSL_NOTHING;
580 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
581 goto err;
582 }
583 else
584 {
585 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
586 goto err;
587 }
588 s->init_num=0;
589
590 /* Since, if we are sending a ssl23 client hello, we are not
591 * reusing a session-id */
592 if (!ssl_get_new_session(s,0))
593 goto err;
594
595 return(SSL_connect(s));
596 err:
597 return(-1);
598 }
599
600