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
66static SSL_METHOD *ssl23_get_client_method(int ver);
67static int ssl23_client_hello(SSL *s);
68static int ssl23_get_server_hello(SSL *s);
69static 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
83SSL_METHOD *SSLv23_client_method(void)
84 {
85 static int init=1;
86 static SSL_METHOD SSLv23_client_data;
87
88 if (init)
89 {
90 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
91
92 if (init)
93 {
94 memcpy((char *)&SSLv23_client_data,
95 (char *)sslv23_base_method(),sizeof(SSL_METHOD));
96 SSLv23_client_data.ssl_connect=ssl23_connect;
97 SSLv23_client_data.get_ssl_method=ssl23_get_client_method;
98 init=0;
99 }
100
101 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
102 }
103 return(&SSLv23_client_data);
104 }
105
106int ssl23_connect(SSL *s)
107 {
108 BUF_MEM *buf=NULL;
109 unsigned long Time=time(NULL);
110 void (*cb)(const SSL *ssl,int type,int val)=NULL;
111 int ret= -1;
112 int new_state,state;
113
114 RAND_add(&Time,sizeof(Time),0);
115 ERR_clear_error();
116 clear_sys_error();
117
118 if (s->info_callback != NULL)
119 cb=s->info_callback;
120 else if (s->ctx->info_callback != NULL)
121 cb=s->ctx->info_callback;
122
123 s->in_handshake++;
124 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
125
126 for (;;)
127 {
128 state=s->state;
129
130 switch(s->state)
131 {
132 case SSL_ST_BEFORE:
133 case SSL_ST_CONNECT:
134 case SSL_ST_BEFORE|SSL_ST_CONNECT:
135 case SSL_ST_OK|SSL_ST_CONNECT:
136
137 if (s->session != NULL)
138 {
139 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
140 ret= -1;
141 goto end;
142 }
143 s->server=0;
144 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
145
146 /* s->version=TLS1_VERSION; */
147 s->type=SSL_ST_CONNECT;
148
149 if (s->init_buf == NULL)
150 {
151 if ((buf=BUF_MEM_new()) == NULL)
152 {
153 ret= -1;
154 goto end;
155 }
156 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
157 {
158 ret= -1;
159 goto end;
160 }
161 s->init_buf=buf;
162 buf=NULL;
163 }
164
165 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
166
167 ssl3_init_finished_mac(s);
168
169 s->state=SSL23_ST_CW_CLNT_HELLO_A;
170 s->ctx->stats.sess_connect++;
171 s->init_num=0;
172 break;
173
174 case SSL23_ST_CW_CLNT_HELLO_A:
175 case SSL23_ST_CW_CLNT_HELLO_B:
176
177 s->shutdown=0;
178 ret=ssl23_client_hello(s);
179 if (ret <= 0) goto end;
180 s->state=SSL23_ST_CR_SRVR_HELLO_A;
181 s->init_num=0;
182
183 break;
184
185 case SSL23_ST_CR_SRVR_HELLO_A:
186 case SSL23_ST_CR_SRVR_HELLO_B:
187 ret=ssl23_get_server_hello(s);
188 if (ret >= 0) cb=NULL;
189 goto end;
190 /* break; */
191
192 default:
193 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
194 ret= -1;
195 goto end;
196 /* break; */
197 }
198
199 if (s->debug) { (void)BIO_flush(s->wbio); }
200
201 if ((cb != NULL) && (s->state != state))
202 {
203 new_state=s->state;
204 s->state=state;
205 cb(s,SSL_CB_CONNECT_LOOP,1);
206 s->state=new_state;
207 }
208 }
209end:
210 s->in_handshake--;
211 if (buf != NULL)
212 BUF_MEM_free(buf);
213 if (cb != NULL)
214 cb(s,SSL_CB_CONNECT_EXIT,ret);
215 return(ret);
216 }
217
218
219static int ssl23_client_hello(SSL *s)
220 {
221 unsigned char *buf;
222 unsigned char *p,*d;
223 int i,ch_len;
224 int ret;
225
226 buf=(unsigned char *)s->init_buf->data;
227 if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
228 {
229#if 0
230 /* don't reuse session-id's */
231 if (!ssl_get_new_session(s,0))
232 {
233 return(-1);
234 }
235#endif
236
237 p=s->s3->client_random;
238 if(RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE) <= 0)
239 return -1;
240
241 /* Do the message type and length last */
242 d= &(buf[2]);
243 p=d+9;
244
245 *(d++)=SSL2_MT_CLIENT_HELLO;
246 if (!(s->options & SSL_OP_NO_TLSv1))
247 {
248 *(d++)=TLS1_VERSION_MAJOR;
249 *(d++)=TLS1_VERSION_MINOR;
250 s->client_version=TLS1_VERSION;
251 }
252 else if (!(s->options & SSL_OP_NO_SSLv3))
253 {
254 *(d++)=SSL3_VERSION_MAJOR;
255 *(d++)=SSL3_VERSION_MINOR;
256 s->client_version=SSL3_VERSION;
257 }
258 else if (!(s->options & SSL_OP_NO_SSLv2))
259 {
260 *(d++)=SSL2_VERSION_MAJOR;
261 *(d++)=SSL2_VERSION_MINOR;
262 s->client_version=SSL2_VERSION;
263 }
264 else
265 {
266 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
267 return(-1);
268 }
269
270 /* Ciphers supported */
271 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p);
272 if (i == 0)
273 {
274 /* no ciphers */
275 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
276 return(-1);
277 }
278 s2n(i,d);
279 p+=i;
280
281 /* put in the session-id, zero since there is no
282 * reuse. */
283#if 0
284 s->session->session_id_length=0;
285#endif
286 s2n(0,d);
287
288 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
289 ch_len=SSL2_CHALLENGE_LENGTH;
290 else
291 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
292
293 /* write out sslv2 challenge */
294 if (SSL3_RANDOM_SIZE < ch_len)
295 i=SSL3_RANDOM_SIZE;
296 else
297 i=ch_len;
298 s2n(i,d);
299 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
300 if(RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
301 return -1;
302
303 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
304 p+=i;
305
306 i= p- &(buf[2]);
307 buf[0]=((i>>8)&0xff)|0x80;
308 buf[1]=(i&0xff);
309
310 s->state=SSL23_ST_CW_CLNT_HELLO_B;
311 /* number of bytes to write */
312 s->init_num=i+2;
313 s->init_off=0;
314
315 ssl3_finish_mac(s,&(buf[2]),i);
316 }
317
318 /* SSL3_ST_CW_CLNT_HELLO_B */
319 ret = ssl23_write_bytes(s);
320 if (ret >= 2)
321 if (s->msg_callback)
322 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
323 return ret;
324 }
325
326static int ssl23_get_server_hello(SSL *s)
327 {
328 char buf[8];
329 unsigned char *p;
330 int i;
331 int n;
332
333 n=ssl23_read_bytes(s,7);
334
335 if (n != 7) return(n);
336 p=s->packet;
337
338 memcpy(buf,p,n);
339
340 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
341 (p[5] == 0x00) && (p[6] == 0x02))
342 {
343#ifdef OPENSSL_NO_SSL2
344 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
345 goto err;
346#else
347 /* we are talking sslv2 */
348 /* we need to clean up the SSLv3 setup and put in the
349 * sslv2 stuff. */
350 int ch_len;
351
352 if (s->options & SSL_OP_NO_SSLv2)
353 {
354 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
355 goto err;
356 }
357 if (s->s2 == NULL)
358 {
359 if (!ssl2_new(s))
360 goto err;
361 }
362 else
363 ssl2_clear(s);
364
365 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
366 ch_len=SSL2_CHALLENGE_LENGTH;
367 else
368 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
369
370 /* write out sslv2 challenge */
371 i=(SSL3_RANDOM_SIZE < ch_len)
372 ?SSL3_RANDOM_SIZE:ch_len;
373 s->s2->challenge_length=i;
374 memcpy(s->s2->challenge,
375 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
376
377 if (s->s3 != NULL) ssl3_free(s);
378
379 if (!BUF_MEM_grow_clean(s->init_buf,
380 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
381 {
382 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
383 goto err;
384 }
385
386 s->state=SSL2_ST_GET_SERVER_HELLO_A;
387 if (!(s->client_version == SSL2_VERSION))
388 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
389 s->s2->ssl2_rollback=1;
390
391 /* setup the 5 bytes we have read so we get them from
392 * the sslv2 buffer */
393 s->rstate=SSL_ST_READ_HEADER;
394 s->packet_length=n;
395 s->packet= &(s->s2->rbuf[0]);
396 memcpy(s->packet,buf,n);
397 s->s2->rbuf_left=n;
398 s->s2->rbuf_offs=0;
399
400 /* we have already written one */
401 s->s2->write_sequence=1;
402
403 s->method=SSLv2_client_method();
404 s->handshake_func=s->method->ssl_connect;
405#endif
406 }
407 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
408 (p[1] == SSL3_VERSION_MAJOR) &&
409 ((p[2] == SSL3_VERSION_MINOR) ||
410 (p[2] == TLS1_VERSION_MINOR)) &&
411 (p[5] == SSL3_MT_SERVER_HELLO))
412 {
413 /* we have sslv3 or tls1 */
414
415 if (!ssl_init_wbio_buffer(s,1)) goto err;
416
417 /* we are in this state */
418 s->state=SSL3_ST_CR_SRVR_HELLO_A;
419
420 /* put the 5 bytes we have read into the input buffer
421 * for SSLv3 */
422 s->rstate=SSL_ST_READ_HEADER;
423 s->packet_length=n;
424 s->packet= &(s->s3->rbuf.buf[0]);
425 memcpy(s->packet,buf,n);
426 s->s3->rbuf.left=n;
427 s->s3->rbuf.offset=0;
428
429 if ((p[2] == SSL3_VERSION_MINOR) &&
430 !(s->options & SSL_OP_NO_SSLv3))
431 {
432 s->version=SSL3_VERSION;
433 s->method=SSLv3_client_method();
434 }
435 else if ((p[2] == TLS1_VERSION_MINOR) &&
436 !(s->options & SSL_OP_NO_TLSv1))
437 {
438 s->version=TLS1_VERSION;
439 s->method=TLSv1_client_method();
440 }
441 else
442 {
443 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
444 goto err;
445 }
446
447 s->handshake_func=s->method->ssl_connect;
448 }
449 else if ((p[0] == SSL3_RT_ALERT) &&
450 (p[1] == SSL3_VERSION_MAJOR) &&
451 ((p[2] == SSL3_VERSION_MINOR) ||
452 (p[2] == TLS1_VERSION_MINOR)) &&
453 (p[3] == 0) &&
454 (p[4] == 2))
455 {
456 void (*cb)(const SSL *ssl,int type,int val)=NULL;
457 int j;
458
459 /* An alert */
460 if (s->info_callback != NULL)
461 cb=s->info_callback;
462 else if (s->ctx->info_callback != NULL)
463 cb=s->ctx->info_callback;
464
465 i=p[5];
466 if (cb != NULL)
467 {
468 j=(i<<8)|p[6];
469 cb(s,SSL_CB_READ_ALERT,j);
470 }
471
472 s->rwstate=SSL_NOTHING;
473 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
474 goto err;
475 }
476 else
477 {
478 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
479 goto err;
480 }
481 s->init_num=0;
482
483 /* Since, if we are sending a ssl23 client hello, we are not
484 * reusing a session-id */
485 if (!ssl_get_new_session(s,0))
486 goto err;
487
488 s->first_packet=1;
489 return(SSL_connect(s));
490err:
491 return(-1);
492 }
493