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=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
227 buf=(unsigned char *)s->init_buf->data;
228 if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
229 {
230 #if 0
231 /* don't reuse session-id's */
232 if (!ssl_get_new_session(s,0))
233 {
234 return(-1);
235 }
236 #endif
237
238 p=s->s3->client_random;
239 Time=time(NULL); /* Time */
240 l2n(Time,p);
241 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
242 return -1;
243
244 if (version == TLS1_VERSION)
245 {
246 version_major = TLS1_VERSION_MAJOR;
247 version_minor = TLS1_VERSION_MINOR;
248 }
249 else if (version == SSL3_VERSION)
250 {
251 version_major = SSL3_VERSION_MAJOR;
252 version_minor = SSL3_VERSION_MINOR;
253 }
254 else if (version == SSL2_VERSION)
255 {
256 version_major = SSL2_VERSION_MAJOR;
257 version_minor = SSL2_VERSION_MINOR;
258 }
259 else
260 {
261 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
262 return(-1);
263 }
264
265 s->client_version = version;
266
267 if (ssl2_compat)
268 {
269 /* create SSL 2.0 compatible Client Hello */
270
271 /* two byte record header will be written last */
272 d = &(buf[2]);
273 p = d + 9; /* leave space for message type, version, individual length fields */
274
275 *(d++) = SSL2_MT_CLIENT_HELLO;
276 *(d++) = version_major;
277 *(d++) = version_minor;
278
279 /* Ciphers supported */
280 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
281 if (i == 0)
282 {
283 /* no ciphers */
284 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
285 return -1;
286 }
287 s2n(i,d);
288 p+=i;
289
290 /* put in the session-id length (zero since there is no reuse) */
291 #if 0
292 s->session->session_id_length=0;
293 #endif
294 s2n(0,d);
295
296 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
297 ch_len=SSL2_CHALLENGE_LENGTH;
298 else
299 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
300
301 /* write out sslv2 challenge */
302 if (SSL3_RANDOM_SIZE < ch_len)
303 i=SSL3_RANDOM_SIZE;
304 else
305 i=ch_len;
306 s2n(i,d);
307 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
308 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
309 return -1;
310
311 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
312 p+=i;
313
314 i= p- &(buf[2]);
315 buf[0]=((i>>8)&0xff)|0x80;
316 buf[1]=(i&0xff);
317
318 /* number of bytes to write */
319 s->init_num=i+2;
320 s->init_off=0;
321
322 ssl3_finish_mac(s,&(buf[2]),i);
323 }
324 else
325 {
326 /* create Client Hello in SSL 3.0/TLS 1.0 format */
327
328 /* do the record header (5 bytes) and handshake message header (4 bytes) last */
329 d = p = &(buf[9]);
330
331 *(p++) = version_major;
332 *(p++) = version_minor;
333
334 /* Random stuff */
335 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
336 p += SSL3_RANDOM_SIZE;
337
338 /* Session ID (zero since there is no reuse) */
339 *(p++) = 0;
340
341 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
342 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
343 if (i == 0)
344 {
345 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
346 return -1;
347 }
348 s2n(i,p);
349 p+=i;
350
351 /* COMPRESSION */
352 if (s->ctx->comp_methods == NULL)
353 j=0;
354 else
355 j=sk_SSL_COMP_num(s->ctx->comp_methods);
356 *(p++)=1+j;
357 for (i=0; i<j; i++)
358 {
359 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
360 *(p++)=comp->id;
361 }
362 *(p++)=0; /* Add the NULL method */
363
364 l = p-d;
365 *p = 42;
366
367 /* fill in 4-byte handshake header */
368 d=&(buf[5]);
369 *(d++)=SSL3_MT_CLIENT_HELLO;
370 l2n3(l,d);
371
372 l += 4;
373
374 if (l > SSL3_RT_MAX_PLAIN_LENGTH)
375 {
376 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
377 return -1;
378 }
379
380 /* fill in 5-byte record header */
381 d=buf;
382 *(d++) = SSL3_RT_HANDSHAKE;
383 *(d++) = version_major;
384 *(d++) = version_minor; /* arguably we should send the *lowest* suported version here
385 * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
386 s2n((int)l,d);
387
388 /* number of bytes to write */
389 s->init_num=p-buf;
390 s->init_off=0;
391
392 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
393 }
394
395 s->state=SSL23_ST_CW_CLNT_HELLO_B;
396 s->init_off=0;
397 }
398
399 /* SSL3_ST_CW_CLNT_HELLO_B */
400 ret = ssl23_write_bytes(s);
401
402 if ((ret >= 2) && s->msg_callback)
403 {
404 /* Client Hello has been sent; tell msg_callback */
405
406 if (ssl2_compat)
407 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
408 else
409 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
410 }
411
412 return ret;
413 }
414
ssl23_get_server_hello(SSL * s)415 static int ssl23_get_server_hello(SSL *s)
416 {
417 char buf[8];
418 unsigned char *p;
419 int i;
420 int n;
421
422 n=ssl23_read_bytes(s,7);
423
424 if (n != 7) return(n);
425 p=s->packet;
426
427 memcpy(buf,p,n);
428
429 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
430 (p[5] == 0x00) && (p[6] == 0x02))
431 {
432 #ifdef OPENSSL_NO_SSL2
433 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
434 goto err;
435 #else
436 /* we are talking sslv2 */
437 /* we need to clean up the SSLv3 setup and put in the
438 * sslv2 stuff. */
439 int ch_len;
440
441 if (s->options & SSL_OP_NO_SSLv2)
442 {
443 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
444 goto err;
445 }
446 if (s->s2 == NULL)
447 {
448 if (!ssl2_new(s))
449 goto err;
450 }
451 else
452 ssl2_clear(s);
453
454 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
455 ch_len=SSL2_CHALLENGE_LENGTH;
456 else
457 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
458
459 /* write out sslv2 challenge */
460 i=(SSL3_RANDOM_SIZE < ch_len)
461 ?SSL3_RANDOM_SIZE:ch_len;
462 s->s2->challenge_length=i;
463 memcpy(s->s2->challenge,
464 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
465
466 if (s->s3 != NULL) ssl3_free(s);
467
468 if (!BUF_MEM_grow_clean(s->init_buf,
469 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
470 {
471 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
472 goto err;
473 }
474
475 s->state=SSL2_ST_GET_SERVER_HELLO_A;
476 if (!(s->client_version == SSL2_VERSION))
477 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
478 s->s2->ssl2_rollback=1;
479
480 /* setup the 5 bytes we have read so we get them from
481 * the sslv2 buffer */
482 s->rstate=SSL_ST_READ_HEADER;
483 s->packet_length=n;
484 s->packet= &(s->s2->rbuf[0]);
485 memcpy(s->packet,buf,n);
486 s->s2->rbuf_left=n;
487 s->s2->rbuf_offs=0;
488
489 /* we have already written one */
490 s->s2->write_sequence=1;
491
492 s->method=SSLv2_client_method();
493 s->handshake_func=s->method->ssl_connect;
494 #endif
495 }
496 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
497 (p[1] == SSL3_VERSION_MAJOR) &&
498 ((p[2] == SSL3_VERSION_MINOR) ||
499 (p[2] == TLS1_VERSION_MINOR)) &&
500 (p[5] == SSL3_MT_SERVER_HELLO))
501 {
502 /* we have sslv3 or tls1 */
503
504 if (!ssl_init_wbio_buffer(s,1)) goto err;
505
506 /* we are in this state */
507 s->state=SSL3_ST_CR_SRVR_HELLO_A;
508
509 /* put the 5 bytes we have read into the input buffer
510 * for SSLv3 */
511 s->rstate=SSL_ST_READ_HEADER;
512 s->packet_length=n;
513 s->packet= &(s->s3->rbuf.buf[0]);
514 memcpy(s->packet,buf,n);
515 s->s3->rbuf.left=n;
516 s->s3->rbuf.offset=0;
517
518 if ((p[2] == SSL3_VERSION_MINOR) &&
519 !(s->options & SSL_OP_NO_SSLv3))
520 {
521 s->version=SSL3_VERSION;
522 s->method=SSLv3_client_method();
523 }
524 else if ((p[2] == TLS1_VERSION_MINOR) &&
525 !(s->options & SSL_OP_NO_TLSv1))
526 {
527 s->version=TLS1_VERSION;
528 s->method=TLSv1_client_method();
529 }
530 else
531 {
532 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
533 goto err;
534 }
535
536 s->handshake_func=s->method->ssl_connect;
537 }
538 else if ((p[0] == SSL3_RT_ALERT) &&
539 (p[1] == SSL3_VERSION_MAJOR) &&
540 ((p[2] == SSL3_VERSION_MINOR) ||
541 (p[2] == TLS1_VERSION_MINOR)) &&
542 (p[3] == 0) &&
543 (p[4] == 2))
544 {
545 void (*cb)(const SSL *ssl,int type,int val)=NULL;
546 int j;
547
548 /* An alert */
549 if (s->info_callback != NULL)
550 cb=s->info_callback;
551 else if (s->ctx->info_callback != NULL)
552 cb=s->ctx->info_callback;
553
554 i=p[5];
555 if (cb != NULL)
556 {
557 j=(i<<8)|p[6];
558 cb(s,SSL_CB_READ_ALERT,j);
559 }
560
561 s->rwstate=SSL_NOTHING;
562 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
563 goto err;
564 }
565 else
566 {
567 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
568 goto err;
569 }
570 s->init_num=0;
571
572 /* Since, if we are sending a ssl23 client hello, we are not
573 * reusing a session-id */
574 if (!ssl_get_new_session(s,0))
575 goto err;
576
577 s->first_packet=1;
578 return(SSL_connect(s));
579 err:
580 return(-1);
581 }
582
583