Support TLS extensions (specifically, HostName)
[openssl.git] / ssl / s23_clnt.c
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 const 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);
69 static const 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
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
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=(unsigned long)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 #ifdef OPENSSL_NO_COMP
353                         *(p++)=1;
354 #else
355
356                         if ((s->options & SSL_OP_NO_COMPRESSION)
357                                                 || !s->ctx->comp_methods)
358                                 j=0;
359                         else
360                                 j=sk_SSL_COMP_num(s->ctx->comp_methods);
361                         *(p++)=1+j;
362                         for (i=0; i<j; i++)
363                                 {
364                                 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
365                                 *(p++)=comp->id;
366                                 }
367 #endif
368                         *(p++)=0; /* Add the NULL method */
369 #ifndef OPENSSL_NO_TLSEXT
370                         if ((p = ssl_add_ClientHello_TLS_extensions(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
371                         {
372                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
373                                 return -1;
374                         }
375 #endif
376                         
377                         l = p-d;
378                         *p = 42;
379
380                         /* fill in 4-byte handshake header */
381                         d=&(buf[5]);
382                         *(d++)=SSL3_MT_CLIENT_HELLO;
383                         l2n3(l,d);
384
385                         l += 4;
386
387                         if (l > SSL3_RT_MAX_PLAIN_LENGTH)
388                                 {
389                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
390                                 return -1;
391                                 }
392                         
393                         /* fill in 5-byte record header */
394                         d=buf;
395                         *(d++) = SSL3_RT_HANDSHAKE;
396                         *(d++) = version_major;
397                         *(d++) = version_minor; /* arguably we should send the *lowest* suported version here
398                                                  * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
399                         s2n((int)l,d);
400
401                         /* number of bytes to write */
402                         s->init_num=p-buf;
403                         s->init_off=0;
404
405                         ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
406                         }
407
408                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
409                 s->init_off=0;
410                 }
411
412         /* SSL3_ST_CW_CLNT_HELLO_B */
413         ret = ssl23_write_bytes(s);
414
415         if ((ret >= 2) && s->msg_callback)
416                 {
417                 /* Client Hello has been sent; tell msg_callback */
418
419                 if (ssl2_compat)
420                         s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
421                 else
422                         s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
423                 }
424
425         return ret;
426         }
427
428 static int ssl23_get_server_hello(SSL *s)
429         {
430         char buf[8];
431         unsigned char *p;
432         int i;
433         int n;
434
435         n=ssl23_read_bytes(s,7);
436
437         if (n != 7) return(n);
438         p=s->packet;
439
440         memcpy(buf,p,n);
441
442         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
443                 (p[5] == 0x00) && (p[6] == 0x02))
444                 {
445 #ifdef OPENSSL_NO_SSL2
446                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
447                 goto err;
448 #else
449                 /* we are talking sslv2 */
450                 /* we need to clean up the SSLv3 setup and put in the
451                  * sslv2 stuff. */
452                 int ch_len;
453
454                 if (s->options & SSL_OP_NO_SSLv2)
455                         {
456                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
457                         goto err;
458                         }
459                 if (s->s2 == NULL)
460                         {
461                         if (!ssl2_new(s))
462                                 goto err;
463                         }
464                 else
465                         ssl2_clear(s);
466
467                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
468                         ch_len=SSL2_CHALLENGE_LENGTH;
469                 else
470                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
471
472                 /* write out sslv2 challenge */
473                 i=(SSL3_RANDOM_SIZE < ch_len)
474                         ?SSL3_RANDOM_SIZE:ch_len;
475                 s->s2->challenge_length=i;
476                 memcpy(s->s2->challenge,
477                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
478
479                 if (s->s3 != NULL) ssl3_free(s);
480
481                 if (!BUF_MEM_grow_clean(s->init_buf,
482                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
483                         {
484                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
485                         goto err;
486                         }
487
488                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
489                 if (!(s->client_version == SSL2_VERSION))
490                         /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
491                         s->s2->ssl2_rollback=1;
492
493                 /* setup the 5 bytes we have read so we get them from
494                  * the sslv2 buffer */
495                 s->rstate=SSL_ST_READ_HEADER;
496                 s->packet_length=n;
497                 s->packet= &(s->s2->rbuf[0]);
498                 memcpy(s->packet,buf,n);
499                 s->s2->rbuf_left=n;
500                 s->s2->rbuf_offs=0;
501
502                 /* we have already written one */
503                 s->s2->write_sequence=1;
504
505                 s->method=SSLv2_client_method();
506                 s->handshake_func=s->method->ssl_connect;
507 #endif
508                 }
509         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
510                  (p[1] == SSL3_VERSION_MAJOR) &&
511                  ((p[2] == SSL3_VERSION_MINOR) ||
512                   (p[2] == TLS1_VERSION_MINOR)) &&
513                  (p[5] == SSL3_MT_SERVER_HELLO))
514                 {
515                 /* we have sslv3 or tls1 */
516
517                 if (!ssl_init_wbio_buffer(s,1)) goto err;
518
519                 /* we are in this state */
520                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
521
522                 /* put the 5 bytes we have read into the input buffer
523                  * for SSLv3 */
524                 s->rstate=SSL_ST_READ_HEADER;
525                 s->packet_length=n;
526                 s->packet= &(s->s3->rbuf.buf[0]);
527                 memcpy(s->packet,buf,n);
528                 s->s3->rbuf.left=n;
529                 s->s3->rbuf.offset=0;
530
531                 if ((p[2] == SSL3_VERSION_MINOR) &&
532                         !(s->options & SSL_OP_NO_SSLv3))
533                         {
534                         s->version=SSL3_VERSION;
535                         s->method=SSLv3_client_method();
536                         }
537                 else if ((p[2] == TLS1_VERSION_MINOR) &&
538                         !(s->options & SSL_OP_NO_TLSv1))
539                         {
540                         s->version=TLS1_VERSION;
541                         s->method=TLSv1_client_method();
542                         }
543                 else
544                         {
545                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
546                         goto err;
547                         }
548                         
549                 s->handshake_func=s->method->ssl_connect;
550                 }
551         else if ((p[0] == SSL3_RT_ALERT) &&
552                  (p[1] == SSL3_VERSION_MAJOR) &&
553                  ((p[2] == SSL3_VERSION_MINOR) ||
554                   (p[2] == TLS1_VERSION_MINOR)) &&
555                  (p[3] == 0) &&
556                  (p[4] == 2))
557                 {
558                 void (*cb)(const SSL *ssl,int type,int val)=NULL;
559                 int j;
560
561                 /* An alert */
562                 if (s->info_callback != NULL)
563                         cb=s->info_callback;
564                 else if (s->ctx->info_callback != NULL)
565                         cb=s->ctx->info_callback;
566  
567                 i=p[5];
568                 if (cb != NULL)
569                         {
570                         j=(i<<8)|p[6];
571                         cb(s,SSL_CB_READ_ALERT,j);
572                         }
573
574                 s->rwstate=SSL_NOTHING;
575                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
576                 goto err;
577                 }
578         else
579                 {
580                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
581                 goto err;
582                 }
583         s->init_num=0;
584
585         /* Since, if we are sending a ssl23 client hello, we are not
586          * reusing a session-id */
587         if (!ssl_get_new_session(s,0))
588                 goto err;
589
590         s->first_packet=1;
591         return(SSL_connect(s));
592 err:
593         return(-1);
594         }
595