First tentative impementation of Kerberos 5 cryptos and keys for SSL/TLS. Implemente...
[openssl.git] / ssl / s3_srvr.c
1 /* ssl/s3_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 #define REUSE_CIPHER_BUG
60 #define NETSCAPE_HANG_BUG
61
62
63 #include <stdio.h>
64 #include <openssl/buffer.h>
65 #include <openssl/rand.h>
66 #include <openssl/objects.h>
67 #include <openssl/md5.h>
68 #include <openssl/sha.h>
69 #include <openssl/evp.h>
70 #include <openssl/x509.h>
71 #include "ssl_locl.h"
72
73 #ifndef NO_KRB5
74 #include "kssl.h"
75 #endif /* NO_KRB5 */
76
77 static SSL_METHOD *ssl3_get_server_method(int ver);
78 static int ssl3_get_client_hello(SSL *s);
79 static int ssl3_check_client_hello(SSL *s);
80 static int ssl3_send_server_hello(SSL *s);
81 static int ssl3_send_server_key_exchange(SSL *s);
82 static int ssl3_send_certificate_request(SSL *s);
83 static int ssl3_send_server_done(SSL *s);
84 static int ssl3_get_client_key_exchange(SSL *s);
85 static int ssl3_get_client_certificate(SSL *s);
86 static int ssl3_get_cert_verify(SSL *s);
87 static int ssl3_send_hello_request(SSL *s);
88
89 static SSL_METHOD *ssl3_get_server_method(int ver)
90         {
91         if (ver == SSL3_VERSION)
92                 return(SSLv3_server_method());
93         else
94                 return(NULL);
95         }
96
97 SSL_METHOD *SSLv3_server_method(void)
98         {
99         static int init=1;
100         static SSL_METHOD SSLv3_server_data;
101
102         if (init)
103                 {
104                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
105                         sizeof(SSL_METHOD));
106                 SSLv3_server_data.ssl_accept=ssl3_accept;
107                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
108                 init=0;
109                 }
110         return(&SSLv3_server_data);
111         }
112
113 int ssl3_accept(SSL *s)
114         {
115         BUF_MEM *buf;
116         unsigned long l,Time=time(NULL);
117         void (*cb)()=NULL;
118         long num1;
119         int ret= -1;
120         int new_state,state,skip=0;
121
122         RAND_add(&Time,sizeof(Time),0);
123         ERR_clear_error();
124         clear_sys_error();
125
126         if (s->info_callback != NULL)
127                 cb=s->info_callback;
128         else if (s->ctx->info_callback != NULL)
129                 cb=s->ctx->info_callback;
130
131         /* init things to blank */
132         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
133         s->in_handshake++;
134
135         if (s->cert == NULL)
136                 {
137                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
138                 return(-1);
139                 }
140
141         for (;;)
142                 {
143                 state=s->state;
144
145                 switch (s->state)
146                         {
147                 case SSL_ST_RENEGOTIATE:
148                         s->new_session=1;
149                         /* s->state=SSL_ST_ACCEPT; */
150
151                 case SSL_ST_BEFORE:
152                 case SSL_ST_ACCEPT:
153                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
154                 case SSL_ST_OK|SSL_ST_ACCEPT:
155
156                         s->server=1;
157                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
158
159                         if ((s->version>>8) != 3)
160                                 {
161                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_INTERNAL_ERROR);
162                                 return -1;
163                                 }
164                         s->type=SSL_ST_ACCEPT;
165
166                         if (s->init_buf == NULL)
167                                 {
168                                 if ((buf=BUF_MEM_new()) == NULL)
169                                         {
170                                         ret= -1;
171                                         goto end;
172                                         }
173                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
174                                         {
175                                         ret= -1;
176                                         goto end;
177                                         }
178                                 s->init_buf=buf;
179                                 }
180
181                         if (!ssl3_setup_buffers(s))
182                                 {
183                                 ret= -1;
184                                 goto end;
185                                 }
186
187                         /* Ok, we now need to push on a buffering BIO so that
188                          * the output is sent in a way that TCP likes :-)
189                          */
190                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
191
192                         s->init_num=0;
193
194                         if (s->state != SSL_ST_RENEGOTIATE)
195                                 {
196                                 ssl3_init_finished_mac(s);
197                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
198                                 s->ctx->stats.sess_accept++;
199                                 }
200                         else
201                                 {
202                                 s->ctx->stats.sess_accept_renegotiate++;
203                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
204                                 }
205                         break;
206
207                 case SSL3_ST_SW_HELLO_REQ_A:
208                 case SSL3_ST_SW_HELLO_REQ_B:
209
210                         s->shutdown=0;
211                         ret=ssl3_send_hello_request(s);
212                         if (ret <= 0) goto end;
213                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
214                         s->state=SSL3_ST_SW_FLUSH;
215                         s->init_num=0;
216
217                         ssl3_init_finished_mac(s);
218                         break;
219
220                 case SSL3_ST_SW_HELLO_REQ_C:
221                         s->state=SSL_ST_OK;
222                         ret=1;
223                         goto end;
224                         /* break; */
225
226                 case SSL3_ST_SR_CLNT_HELLO_A:
227                 case SSL3_ST_SR_CLNT_HELLO_B:
228                 case SSL3_ST_SR_CLNT_HELLO_C:
229
230                         s->shutdown=0;
231                         ret=ssl3_get_client_hello(s);
232                         if (ret <= 0) goto end;
233                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
234                         s->init_num=0;
235                         break;
236
237                 case SSL3_ST_SW_SRVR_HELLO_A:
238                 case SSL3_ST_SW_SRVR_HELLO_B:
239                         ret=ssl3_send_server_hello(s);
240                         if (ret <= 0) goto end;
241
242                         if (s->hit)
243                                 s->state=SSL3_ST_SW_CHANGE_A;
244                         else
245                                 s->state=SSL3_ST_SW_CERT_A;
246                         s->init_num=0;
247                         break;
248
249                 case SSL3_ST_SW_CERT_A:
250                 case SSL3_ST_SW_CERT_B:
251                         /* Check if it is anon DH */
252                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
253                                 {
254                                 ret=ssl3_send_server_certificate(s);
255                                 if (ret <= 0) goto end;
256                                 }
257                         else
258                                 skip=1;
259                         s->state=SSL3_ST_SW_KEY_EXCH_A;
260                         s->init_num=0;
261                         break;
262
263                 case SSL3_ST_SW_KEY_EXCH_A:
264                 case SSL3_ST_SW_KEY_EXCH_B:
265                         l=s->s3->tmp.new_cipher->algorithms;
266
267                         /* clear this, it may get reset by
268                          * send_server_key_exchange */
269                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
270 #ifndef NO_KRB5
271                                 && !(l & SSL_KRB5)
272 #endif /* NO_KRB5 */
273                                 )
274                                 s->s3->tmp.use_rsa_tmp=1;
275                         else
276                                 s->s3->tmp.use_rsa_tmp=0;
277
278                         /* only send if a DH key exchange, fortezza or
279                          * RSA but we have a sign only certificate */
280                         if (s->s3->tmp.use_rsa_tmp
281                             || (l & (SSL_DH|SSL_kFZA))
282                             || ((l & SSL_kRSA)
283                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
284                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
285                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
286                                         )
287                                     )
288                                 )
289                             )
290                                 {
291                                 ret=ssl3_send_server_key_exchange(s);
292                                 if (ret <= 0) goto end;
293                                 }
294                         else
295                                 skip=1;
296
297                         s->state=SSL3_ST_SW_CERT_REQ_A;
298                         s->init_num=0;
299                         break;
300
301                 case SSL3_ST_SW_CERT_REQ_A:
302                 case SSL3_ST_SW_CERT_REQ_B:
303                         if (/* don't request cert unless asked for it: */
304                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
305                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
306                                  * don't request cert during re-negotiation: */
307                                 ((s->session->peer != NULL) &&
308                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
309                                 /* never request cert in anonymous ciphersuites
310                                  * (see section "Certificate request" in SSL 3 drafts
311                                  * and in RFC 2246): */
312                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
313                                  /* ... except when the application insists on verification
314                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
315                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
316                                 {
317                                 /* no cert request */
318                                 skip=1;
319                                 s->s3->tmp.cert_request=0;
320                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
321                                 }
322                         else
323                                 {
324                                 s->s3->tmp.cert_request=1;
325                                 ret=ssl3_send_certificate_request(s);
326                                 if (ret <= 0) goto end;
327 #ifndef NETSCAPE_HANG_BUG
328                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
329 #else
330                                 s->state=SSL3_ST_SW_FLUSH;
331                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
332 #endif
333                                 s->init_num=0;
334                                 }
335                         break;
336
337                 case SSL3_ST_SW_SRVR_DONE_A:
338                 case SSL3_ST_SW_SRVR_DONE_B:
339                         ret=ssl3_send_server_done(s);
340                         if (ret <= 0) goto end;
341                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
342                         s->state=SSL3_ST_SW_FLUSH;
343                         s->init_num=0;
344                         break;
345                 
346                 case SSL3_ST_SW_FLUSH:
347                         /* number of bytes to be flushed */
348                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
349                         if (num1 > 0)
350                                 {
351                                 s->rwstate=SSL_WRITING;
352                                 num1=BIO_flush(s->wbio);
353                                 if (num1 <= 0) { ret= -1; goto end; }
354                                 s->rwstate=SSL_NOTHING;
355                                 }
356
357                         s->state=s->s3->tmp.next_state;
358                         break;
359
360                 case SSL3_ST_SR_CERT_A:
361                 case SSL3_ST_SR_CERT_B:
362                         /* Check for second client hello (MS SGC) */
363                         ret = ssl3_check_client_hello(s);
364                         if (ret <= 0)
365                                 goto end;
366                         if (ret == 2)
367                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
368                         else {
369                                 /* could be sent for a DH cert, even if we
370                                  * have not asked for it :-) */
371                                 ret=ssl3_get_client_certificate(s);
372                                 if (ret <= 0) goto end;
373                                 s->init_num=0;
374                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
375                         }
376                         break;
377
378                 case SSL3_ST_SR_KEY_EXCH_A:
379                 case SSL3_ST_SR_KEY_EXCH_B:
380                         ret=ssl3_get_client_key_exchange(s);
381                         if (ret <= 0) goto end;
382                         s->state=SSL3_ST_SR_CERT_VRFY_A;
383                         s->init_num=0;
384
385                         /* We need to get hashes here so if there is
386                          * a client cert, it can be verified */ 
387                         s->method->ssl3_enc->cert_verify_mac(s,
388                                 &(s->s3->finish_dgst1),
389                                 &(s->s3->tmp.cert_verify_md[0]));
390                         s->method->ssl3_enc->cert_verify_mac(s,
391                                 &(s->s3->finish_dgst2),
392                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
393
394                         break;
395
396                 case SSL3_ST_SR_CERT_VRFY_A:
397                 case SSL3_ST_SR_CERT_VRFY_B:
398
399                         /* we should decide if we expected this one */
400                         ret=ssl3_get_cert_verify(s);
401                         if (ret <= 0) goto end;
402
403                         s->state=SSL3_ST_SR_FINISHED_A;
404                         s->init_num=0;
405                         break;
406
407                 case SSL3_ST_SR_FINISHED_A:
408                 case SSL3_ST_SR_FINISHED_B:
409                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
410                                 SSL3_ST_SR_FINISHED_B);
411                         if (ret <= 0) goto end;
412                         if (s->hit)
413                                 s->state=SSL_ST_OK;
414                         else
415                                 s->state=SSL3_ST_SW_CHANGE_A;
416                         s->init_num=0;
417                         break;
418
419                 case SSL3_ST_SW_CHANGE_A:
420                 case SSL3_ST_SW_CHANGE_B:
421
422                         s->session->cipher=s->s3->tmp.new_cipher;
423                         if (!s->method->ssl3_enc->setup_key_block(s))
424                                 { ret= -1; goto end; }
425
426                         ret=ssl3_send_change_cipher_spec(s,
427                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
428
429                         if (ret <= 0) goto end;
430                         s->state=SSL3_ST_SW_FINISHED_A;
431                         s->init_num=0;
432
433                         if (!s->method->ssl3_enc->change_cipher_state(s,
434                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
435                                 {
436                                 ret= -1;
437                                 goto end;
438                                 }
439
440                         break;
441
442                 case SSL3_ST_SW_FINISHED_A:
443                 case SSL3_ST_SW_FINISHED_B:
444                         ret=ssl3_send_finished(s,
445                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
446                                 s->method->ssl3_enc->server_finished_label,
447                                 s->method->ssl3_enc->server_finished_label_len);
448                         if (ret <= 0) goto end;
449                         s->state=SSL3_ST_SW_FLUSH;
450                         if (s->hit)
451                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
452                         else
453                                 s->s3->tmp.next_state=SSL_ST_OK;
454                         s->init_num=0;
455                         break;
456
457                 case SSL_ST_OK:
458                         /* clean a few things up */
459                         ssl3_cleanup_key_block(s);
460
461                         BUF_MEM_free(s->init_buf);
462                         s->init_buf=NULL;
463
464                         /* remove buffering on output */
465                         ssl_free_wbio_buffer(s);
466
467                         s->new_session=0;
468                         s->init_num=0;
469
470                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
471
472                         s->ctx->stats.sess_accept_good++;
473                         /* s->server=1; */
474                         s->handshake_func=ssl3_accept;
475                         ret=1;
476
477                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
478
479                         goto end;
480                         /* break; */
481
482                 default:
483                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
484                         ret= -1;
485                         goto end;
486                         /* break; */
487                         }
488                 
489                 if (!s->s3->tmp.reuse_message && !skip)
490                         {
491                         if (s->debug)
492                                 {
493                                 if ((ret=BIO_flush(s->wbio)) <= 0)
494                                         goto end;
495                                 }
496
497
498                         if ((cb != NULL) && (s->state != state))
499                                 {
500                                 new_state=s->state;
501                                 s->state=state;
502                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
503                                 s->state=new_state;
504                                 }
505                         }
506                 skip=0;
507                 }
508 end:
509         /* BIO_flush(s->wbio); */
510
511         if (cb != NULL)
512                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
513         s->in_handshake--;
514         return(ret);
515         }
516
517 static int ssl3_send_hello_request(SSL *s)
518         {
519         unsigned char *p;
520
521         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
522                 {
523                 p=(unsigned char *)s->init_buf->data;
524                 *(p++)=SSL3_MT_HELLO_REQUEST;
525                 *(p++)=0;
526                 *(p++)=0;
527                 *(p++)=0;
528
529                 s->state=SSL3_ST_SW_HELLO_REQ_B;
530                 /* number of bytes to write */
531                 s->init_num=4;
532                 s->init_off=0;
533                 }
534
535         /* SSL3_ST_SW_HELLO_REQ_B */
536         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
537         }
538
539 static int ssl3_check_client_hello(SSL *s)
540         {
541         int ok;
542         long n;
543
544         n=ssl3_get_message(s,
545                 SSL3_ST_SR_CERT_A,
546                 SSL3_ST_SR_CERT_B,
547                 -1,
548                 SSL3_RT_MAX_PLAIN_LENGTH,
549                 &ok);
550         if (!ok) return((int)n);
551         s->s3->tmp.reuse_message = 1;
552         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
553                 {
554                 /* Throw away what we have done so far in the current handshake,
555                  * which will now be aborted. (A full SSL_clear would be too much.)
556                  * I hope that tmp.dh is the only thing that may need to be cleared
557                  * when a handshake is not completed ... */
558 #ifndef NO_DH
559                 if (s->s3->tmp.dh != NULL)
560                         {
561                         DH_free(s->s3->tmp.dh);
562                         s->s3->tmp.dh = NULL;
563                         }
564 #endif
565                 return 2;
566                 }
567         return 1;
568 }
569
570 static int ssl3_get_client_hello(SSL *s)
571         {
572         int i,j,ok,al,ret= -1;
573         long n;
574         unsigned long id;
575         unsigned char *p,*d,*q;
576         SSL_CIPHER *c;
577         SSL_COMP *comp=NULL;
578         STACK_OF(SSL_CIPHER) *ciphers=NULL;
579
580         /* We do this so that we will respond with our native type.
581          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
582          * This down switching should be handled by a different method.
583          * If we are SSLv3, we will respond with SSLv3, even if prompted with
584          * TLSv1.
585          */
586         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
587                 {
588                 s->first_packet=1;
589                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
590                 }
591         n=ssl3_get_message(s,
592                 SSL3_ST_SR_CLNT_HELLO_B,
593                 SSL3_ST_SR_CLNT_HELLO_C,
594                 SSL3_MT_CLIENT_HELLO,
595                 SSL3_RT_MAX_PLAIN_LENGTH,
596                 &ok);
597
598         if (!ok) return((int)n);
599         d=p=(unsigned char *)s->init_buf->data;
600
601         /* use version from inside client hello, not from record header
602          * (may differ: see RFC 2246, Appendix E, second paragraph) */
603         s->client_version=(((int)p[0])<<8)|(int)p[1];
604         p+=2;
605
606         /* load the client random */
607         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
608         p+=SSL3_RANDOM_SIZE;
609
610         /* get the session-id */
611         j= *(p++);
612
613         s->hit=0;
614         if (j == 0)
615                 {
616                 if (!ssl_get_new_session(s,1))
617                         goto err;
618                 }
619         else
620                 {
621                 i=ssl_get_prev_session(s,p,j);
622                 if (i == 1)
623                         { /* previous session */
624                         s->hit=1;
625                         }
626                 else if (i == -1)
627                         goto err;
628                 else /* i == 0 */
629                         {
630                         if (!ssl_get_new_session(s,1))
631                                 goto err;
632                         }
633                 }
634
635         p+=j;
636         n2s(p,i);
637         if ((i == 0) && (j != 0))
638                 {
639                 /* we need a cipher if we are not resuming a session */
640                 al=SSL_AD_ILLEGAL_PARAMETER;
641                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
642                 goto f_err;
643                 }
644         if ((i+p) > (d+n))
645                 {
646                 /* not enough data */
647                 al=SSL_AD_DECODE_ERROR;
648                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
649                 goto f_err;
650                 }
651         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
652                 == NULL))
653                 {
654                 goto err;
655                 }
656         p+=i;
657
658         /* If it is a hit, check that the cipher is in the list */
659         if ((s->hit) && (i > 0))
660                 {
661                 j=0;
662                 id=s->session->cipher->id;
663
664 #ifdef CIPHER_DEBUG
665                 printf("client sent %d ciphers\n",sk_num(ciphers));
666 #endif
667                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
668                         {
669                         c=sk_SSL_CIPHER_value(ciphers,i);
670 #ifdef CIPHER_DEBUG
671                         printf("client [%2d of %2d]:%s\n",
672                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
673 #endif
674                         if (c->id == id)
675                                 {
676                                 j=1;
677                                 break;
678                                 }
679                         }
680                 if (j == 0)
681                         {
682                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
683                                 {
684                                 /* Very bad for multi-threading.... */
685                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
686                                                                        0);
687                                 }
688                         else
689                                 {
690                                 /* we need to have the cipher in the cipher
691                                  * list if we are asked to reuse it */
692                                 al=SSL_AD_ILLEGAL_PARAMETER;
693                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
694                                 goto f_err;
695                                 }
696                         }
697                 }
698
699         /* compression */
700         i= *(p++);
701         q=p;
702         for (j=0; j<i; j++)
703                 {
704                 if (p[j] == 0) break;
705                 }
706
707         p+=i;
708         if (j >= i)
709                 {
710                 /* no compress */
711                 al=SSL_AD_DECODE_ERROR;
712                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
713                 goto f_err;
714                 }
715
716         /* Worst case, we will use the NULL compression, but if we have other
717          * options, we will now look for them.  We have i-1 compression
718          * algorithms from the client, starting at q. */
719         s->s3->tmp.new_compression=NULL;
720         if (s->ctx->comp_methods != NULL)
721                 { /* See if we have a match */
722                 int m,nn,o,v,done=0;
723
724                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
725                 for (m=0; m<nn; m++)
726                         {
727                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
728                         v=comp->id;
729                         for (o=0; o<i; o++)
730                                 {
731                                 if (v == q[o])
732                                         {
733                                         done=1;
734                                         break;
735                                         }
736                                 }
737                         if (done) break;
738                         }
739                 if (done)
740                         s->s3->tmp.new_compression=comp;
741                 else
742                         comp=NULL;
743                 }
744
745         /* TLS does not mind if there is extra stuff */
746         if (s->version == SSL3_VERSION)
747                 {
748                 if (p > (d+n))
749                         {
750                         /* wrong number of bytes,
751                          * there could be more to follow */
752                         al=SSL_AD_DECODE_ERROR;
753                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
754                         goto f_err;
755                         }
756                 }
757
758         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
759          * pick a cipher */
760
761         if (!s->hit)
762                 {
763                 s->session->compress_meth=(comp == NULL)?0:comp->id;
764                 if (s->session->ciphers != NULL)
765                         sk_SSL_CIPHER_free(s->session->ciphers);
766                 s->session->ciphers=ciphers;
767                 if (ciphers == NULL)
768                         {
769                         al=SSL_AD_ILLEGAL_PARAMETER;
770                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
771                         goto f_err;
772                         }
773                 ciphers=NULL;
774                 c=ssl3_choose_cipher(s,s->session->ciphers,
775                                      ssl_get_ciphers_by_id(s));
776
777                 if (c == NULL)
778                         {
779                         al=SSL_AD_HANDSHAKE_FAILURE;
780                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
781                         goto f_err;
782                         }
783                 s->s3->tmp.new_cipher=c;
784                 }
785         else
786                 {
787                 /* Session-id reuse */
788 #ifdef REUSE_CIPHER_BUG
789                 STACK_OF(SSL_CIPHER) *sk;
790                 SSL_CIPHER *nc=NULL;
791                 SSL_CIPHER *ec=NULL;
792
793                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
794                         {
795                         sk=s->session->ciphers;
796                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
797                                 {
798                                 c=sk_SSL_CIPHER_value(sk,i);
799                                 if (c->algorithms & SSL_eNULL)
800                                         nc=c;
801                                 if (SSL_C_IS_EXPORT(c))
802                                         ec=c;
803                                 }
804                         if (nc != NULL)
805                                 s->s3->tmp.new_cipher=nc;
806                         else if (ec != NULL)
807                                 s->s3->tmp.new_cipher=ec;
808                         else
809                                 s->s3->tmp.new_cipher=s->session->cipher;
810                         }
811                 else
812 #endif
813                 s->s3->tmp.new_cipher=s->session->cipher;
814                 }
815         
816         /* we now have the following setup. 
817          * client_random
818          * cipher_list          - our prefered list of ciphers
819          * ciphers              - the clients prefered list of ciphers
820          * compression          - basically ignored right now
821          * ssl version is set   - sslv3
822          * s->session           - The ssl session has been setup.
823          * s->hit               - session reuse flag
824          * s->tmp.new_cipher    - the new cipher to use.
825          */
826
827         ret=1;
828         if (0)
829                 {
830 f_err:
831                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
832                 }
833 err:
834         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
835         return(ret);
836         }
837
838 static int ssl3_send_server_hello(SSL *s)
839         {
840         unsigned char *buf;
841         unsigned char *p,*d;
842         int i,sl;
843         unsigned long l,Time;
844
845         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
846                 {
847                 buf=(unsigned char *)s->init_buf->data;
848                 p=s->s3->server_random;
849                 Time=time(NULL);                        /* Time */
850                 l2n(Time,p);
851                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
852                 /* Do the message type and length last */
853                 d=p= &(buf[4]);
854
855                 *(p++)=s->version>>8;
856                 *(p++)=s->version&0xff;
857
858                 /* Random stuff */
859                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
860                 p+=SSL3_RANDOM_SIZE;
861
862                 /* now in theory we have 3 options to sending back the
863                  * session id.  If it is a re-use, we send back the
864                  * old session-id, if it is a new session, we send
865                  * back the new session-id or we send back a 0 length
866                  * session-id if we want it to be single use.
867                  * Currently I will not implement the '0' length session-id
868                  * 12-Jan-98 - I'll now support the '0' length stuff.
869                  */
870                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
871                         s->session->session_id_length=0;
872
873                 sl=s->session->session_id_length;
874                 *(p++)=sl;
875                 memcpy(p,s->session->session_id,sl);
876                 p+=sl;
877
878                 /* put the cipher */
879                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
880                 p+=i;
881
882                 /* put the compression method */
883                 if (s->s3->tmp.new_compression == NULL)
884                         *(p++)=0;
885                 else
886                         *(p++)=s->s3->tmp.new_compression->id;
887
888                 /* do the header */
889                 l=(p-d);
890                 d=buf;
891                 *(d++)=SSL3_MT_SERVER_HELLO;
892                 l2n3(l,d);
893
894                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
895                 /* number of bytes to write */
896                 s->init_num=p-buf;
897                 s->init_off=0;
898                 }
899
900         /* SSL3_ST_CW_CLNT_HELLO_B */
901         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
902         }
903
904 static int ssl3_send_server_done(SSL *s)
905         {
906         unsigned char *p;
907
908         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
909                 {
910                 p=(unsigned char *)s->init_buf->data;
911
912                 /* do the header */
913                 *(p++)=SSL3_MT_SERVER_DONE;
914                 *(p++)=0;
915                 *(p++)=0;
916                 *(p++)=0;
917
918                 s->state=SSL3_ST_SW_SRVR_DONE_B;
919                 /* number of bytes to write */
920                 s->init_num=4;
921                 s->init_off=0;
922                 }
923
924         /* SSL3_ST_CW_CLNT_HELLO_B */
925         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
926         }
927
928 static int ssl3_send_server_key_exchange(SSL *s)
929         {
930 #ifndef NO_RSA
931         unsigned char *q;
932         int j,num;
933         RSA *rsa;
934         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
935         unsigned int u;
936 #endif
937 #ifndef NO_DH
938         DH *dh=NULL,*dhp;
939 #endif
940         EVP_PKEY *pkey;
941         unsigned char *p,*d;
942         int al,i;
943         unsigned long type;
944         int n;
945         CERT *cert;
946         BIGNUM *r[4];
947         int nr[4],kn;
948         BUF_MEM *buf;
949         EVP_MD_CTX md_ctx;
950
951         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
952                 {
953                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
954                 cert=s->cert;
955
956                 buf=s->init_buf;
957
958                 r[0]=r[1]=r[2]=r[3]=NULL;
959                 n=0;
960 #ifndef NO_RSA
961                 if (type & SSL_kRSA)
962                         {
963                         rsa=cert->rsa_tmp;
964                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
965                                 {
966                                 rsa=s->cert->rsa_tmp_cb(s,
967                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
968                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
969                                 if(rsa == NULL)
970                                 {
971                                         al=SSL_AD_HANDSHAKE_FAILURE;
972                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
973                                         goto f_err;
974                                 }
975                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
976                                 cert->rsa_tmp=rsa;
977                                 }
978                         if (rsa == NULL)
979                                 {
980                                 al=SSL_AD_HANDSHAKE_FAILURE;
981                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
982                                 goto f_err;
983                                 }
984                         r[0]=rsa->n;
985                         r[1]=rsa->e;
986                         s->s3->tmp.use_rsa_tmp=1;
987                         }
988                 else
989 #endif
990 #ifndef NO_DH
991                         if (type & SSL_kEDH)
992                         {
993                         dhp=cert->dh_tmp;
994                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
995                                 dhp=s->cert->dh_tmp_cb(s,
996                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
997                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
998                         if (dhp == NULL)
999                                 {
1000                                 al=SSL_AD_HANDSHAKE_FAILURE;
1001                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1002                                 goto f_err;
1003                                 }
1004
1005                         if (s->s3->tmp.dh != NULL)
1006                                 {
1007                                 DH_free(dh);
1008                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, SSL_R_INTERNAL_ERROR);
1009                                 goto err;
1010                                 }
1011
1012                         if ((dh=DHparams_dup(dhp)) == NULL)
1013                                 {
1014                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1015                                 goto err;
1016                                 }
1017
1018                         s->s3->tmp.dh=dh;
1019                         if ((dhp->pub_key == NULL ||
1020                              dhp->priv_key == NULL ||
1021                              (s->options & SSL_OP_SINGLE_DH_USE)))
1022                                 {
1023                                 if(!DH_generate_key(dh))
1024                                     {
1025                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1026                                            ERR_R_DH_LIB);
1027                                     goto err;
1028                                     }
1029                                 }
1030                         else
1031                                 {
1032                                 dh->pub_key=BN_dup(dhp->pub_key);
1033                                 dh->priv_key=BN_dup(dhp->priv_key);
1034                                 if ((dh->pub_key == NULL) ||
1035                                         (dh->priv_key == NULL))
1036                                         {
1037                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1038                                         goto err;
1039                                         }
1040                                 }
1041                         r[0]=dh->p;
1042                         r[1]=dh->g;
1043                         r[2]=dh->pub_key;
1044                         }
1045                 else 
1046 #endif
1047                         {
1048                         al=SSL_AD_HANDSHAKE_FAILURE;
1049                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1050                         goto f_err;
1051                         }
1052                 for (i=0; r[i] != NULL; i++)
1053                         {
1054                         nr[i]=BN_num_bytes(r[i]);
1055                         n+=2+nr[i];
1056                         }
1057
1058                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1059                         {
1060                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1061                                 == NULL)
1062                                 {
1063                                 al=SSL_AD_DECODE_ERROR;
1064                                 goto f_err;
1065                                 }
1066                         kn=EVP_PKEY_size(pkey);
1067                         }
1068                 else
1069                         {
1070                         pkey=NULL;
1071                         kn=0;
1072                         }
1073
1074                 if (!BUF_MEM_grow(buf,n+4+kn))
1075                         {
1076                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1077                         goto err;
1078                         }
1079                 d=(unsigned char *)s->init_buf->data;
1080                 p= &(d[4]);
1081
1082                 for (i=0; r[i] != NULL; i++)
1083                         {
1084                         s2n(nr[i],p);
1085                         BN_bn2bin(r[i],p);
1086                         p+=nr[i];
1087                         }
1088
1089                 /* not anonymous */
1090                 if (pkey != NULL)
1091                         {
1092                         /* n is the length of the params, they start at &(d[4])
1093                          * and p points to the space at the end. */
1094 #ifndef NO_RSA
1095                         if (pkey->type == EVP_PKEY_RSA)
1096                                 {
1097                                 q=md_buf;
1098                                 j=0;
1099                                 for (num=2; num > 0; num--)
1100                                         {
1101                                         EVP_DigestInit(&md_ctx,(num == 2)
1102                                                 ?s->ctx->md5:s->ctx->sha1);
1103                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1104                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1105                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1106                                         EVP_DigestFinal(&md_ctx,q,
1107                                                 (unsigned int *)&i);
1108                                         q+=i;
1109                                         j+=i;
1110                                         }
1111                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1112                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1113                                         {
1114                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1115                                         goto err;
1116                                         }
1117                                 s2n(u,p);
1118                                 n+=u+2;
1119                                 }
1120                         else
1121 #endif
1122 #if !defined(NO_DSA)
1123                                 if (pkey->type == EVP_PKEY_DSA)
1124                                 {
1125                                 /* lets do DSS */
1126                                 EVP_SignInit(&md_ctx,EVP_dss1());
1127                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1128                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1129                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1130                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1131                                         (unsigned int *)&i,pkey))
1132                                         {
1133                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1134                                         goto err;
1135                                         }
1136                                 s2n(i,p);
1137                                 n+=i+2;
1138                                 }
1139                         else
1140 #endif
1141                                 {
1142                                 /* Is this error check actually needed? */
1143                                 al=SSL_AD_HANDSHAKE_FAILURE;
1144                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1145                                 goto f_err;
1146                                 }
1147                         }
1148
1149                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1150                 l2n3(n,d);
1151
1152                 /* we should now have things packed up, so lets send
1153                  * it off */
1154                 s->init_num=n+4;
1155                 s->init_off=0;
1156                 }
1157
1158         s->state = SSL3_ST_SW_KEY_EXCH_B;
1159         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1160 f_err:
1161         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1162 err:
1163         return(-1);
1164         }
1165
1166 static int ssl3_send_certificate_request(SSL *s)
1167         {
1168         unsigned char *p,*d;
1169         int i,j,nl,off,n;
1170         STACK_OF(X509_NAME) *sk=NULL;
1171         X509_NAME *name;
1172         BUF_MEM *buf;
1173
1174         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1175                 {
1176                 buf=s->init_buf;
1177
1178                 d=p=(unsigned char *)&(buf->data[4]);
1179
1180                 /* get the list of acceptable cert types */
1181                 p++;
1182                 n=ssl3_get_req_cert_type(s,p);
1183                 d[0]=n;
1184                 p+=n;
1185                 n++;
1186
1187                 off=n;
1188                 p+=2;
1189                 n+=2;
1190
1191                 sk=SSL_get_client_CA_list(s);
1192                 nl=0;
1193                 if (sk != NULL)
1194                         {
1195                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1196                                 {
1197                                 name=sk_X509_NAME_value(sk,i);
1198                                 j=i2d_X509_NAME(name,NULL);
1199                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1200                                         {
1201                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1202                                         goto err;
1203                                         }
1204                                 p=(unsigned char *)&(buf->data[4+n]);
1205                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1206                                         {
1207                                         s2n(j,p);
1208                                         i2d_X509_NAME(name,&p);
1209                                         n+=2+j;
1210                                         nl+=2+j;
1211                                         }
1212                                 else
1213                                         {
1214                                         d=p;
1215                                         i2d_X509_NAME(name,&p);
1216                                         j-=2; s2n(j,d); j+=2;
1217                                         n+=j;
1218                                         nl+=j;
1219                                         }
1220                                 }
1221                         }
1222                 /* else no CA names */
1223                 p=(unsigned char *)&(buf->data[4+off]);
1224                 s2n(nl,p);
1225
1226                 d=(unsigned char *)buf->data;
1227                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1228                 l2n3(n,d);
1229
1230                 /* we should now have things packed up, so lets send
1231                  * it off */
1232
1233                 s->init_num=n+4;
1234                 s->init_off=0;
1235 #ifdef NETSCAPE_HANG_BUG
1236                 p=(unsigned char *)s->init_buf->data + s->init_num;
1237
1238                 /* do the header */
1239                 *(p++)=SSL3_MT_SERVER_DONE;
1240                 *(p++)=0;
1241                 *(p++)=0;
1242                 *(p++)=0;
1243                 s->init_num += 4;
1244 #endif
1245
1246                 }
1247
1248         /* SSL3_ST_SW_CERT_REQ_B */
1249         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1250 err:
1251         return(-1);
1252         }
1253
1254 static int ssl3_get_client_key_exchange(SSL *s)
1255         {
1256         int i,al,ok;
1257         long n;
1258         unsigned long l;
1259         unsigned char *p;
1260 #ifndef NO_RSA
1261         RSA *rsa=NULL;
1262         EVP_PKEY *pkey=NULL;
1263 #endif
1264 #ifndef NO_DH
1265         BIGNUM *pub=NULL;
1266         DH *dh_srvr;
1267 #endif
1268 #ifndef NO_KRB5
1269         KSSL_ERR kssl_err;
1270 #endif /* NO_KRB5 */
1271
1272         n=ssl3_get_message(s,
1273                 SSL3_ST_SR_KEY_EXCH_A,
1274                 SSL3_ST_SR_KEY_EXCH_B,
1275                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1276                 2048, /* ??? */
1277                 &ok);
1278
1279         if (!ok) return((int)n);
1280         p=(unsigned char *)s->init_buf->data;
1281
1282         l=s->s3->tmp.new_cipher->algorithms;
1283
1284 #ifndef NO_RSA
1285         if (l & SSL_kRSA)
1286                 {
1287                 /* FIX THIS UP EAY EAY EAY EAY */
1288                 if (s->s3->tmp.use_rsa_tmp)
1289                         {
1290                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1291                                 rsa=s->cert->rsa_tmp;
1292                         /* Don't do a callback because rsa_tmp should
1293                          * be sent already */
1294                         if (rsa == NULL)
1295                                 {
1296                                 al=SSL_AD_HANDSHAKE_FAILURE;
1297                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1298                                 goto f_err;
1299
1300                                 }
1301                         }
1302                 else
1303                         {
1304                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1305                         if (    (pkey == NULL) ||
1306                                 (pkey->type != EVP_PKEY_RSA) ||
1307                                 (pkey->pkey.rsa == NULL))
1308                                 {
1309                                 al=SSL_AD_HANDSHAKE_FAILURE;
1310                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1311                                 goto f_err;
1312                                 }
1313                         rsa=pkey->pkey.rsa;
1314                         }
1315
1316                 /* TLS */
1317                 if (s->version > SSL3_VERSION)
1318                         {
1319                         n2s(p,i);
1320                         if (n != i+2)
1321                                 {
1322                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1323                                         {
1324                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1325                                         goto err;
1326                                         }
1327                                 else
1328                                         p-=2;
1329                                 }
1330                         else
1331                                 n=i;
1332                         }
1333
1334                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1335
1336                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1337                         {
1338                         al=SSL_AD_DECODE_ERROR;
1339                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1340                         goto f_err;
1341                         }
1342
1343                 if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1344                         {
1345                         /* The premaster secret must contain the same version number as the
1346                          * ClientHello to detect version rollback attacks (strangely, the
1347                          * protocol does not offer such protection for DH ciphersuites).
1348                          * However, buggy clients exist that send the negotiated protocol
1349                          * version instead if the server does not support the requested
1350                          * protocol version.
1351                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1352                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1353                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1354                                 {
1355                                 al=SSL_AD_DECODE_ERROR;
1356                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1357                                 goto f_err;
1358                                 }
1359                         }
1360
1361                 s->session->master_key_length=
1362                         s->method->ssl3_enc->generate_master_secret(s,
1363                                 s->session->master_key,
1364                                 p,i);
1365                 memset(p,0,i);
1366                 }
1367         else
1368 #endif
1369 #ifndef NO_DH
1370                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1371                 {
1372                 n2s(p,i);
1373                 if (n != i+2)
1374                         {
1375                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1376                                 {
1377                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1378                                 goto err;
1379                                 }
1380                         else
1381                                 {
1382                                 p-=2;
1383                                 i=(int)n;
1384                                 }
1385                         }
1386
1387                 if (n == 0L) /* the parameters are in the cert */
1388                         {
1389                         al=SSL_AD_HANDSHAKE_FAILURE;
1390                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1391                         goto f_err;
1392                         }
1393                 else
1394                         {
1395                         if (s->s3->tmp.dh == NULL)
1396                                 {
1397                                 al=SSL_AD_HANDSHAKE_FAILURE;
1398                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1399                                 goto f_err;
1400                                 }
1401                         else
1402                                 dh_srvr=s->s3->tmp.dh;
1403                         }
1404
1405                 pub=BN_bin2bn(p,i,NULL);
1406                 if (pub == NULL)
1407                         {
1408                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1409                         goto err;
1410                         }
1411
1412                 i=DH_compute_key(p,pub,dh_srvr);
1413
1414                 if (i <= 0)
1415                         {
1416                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1417                         goto err;
1418                         }
1419
1420                 DH_free(s->s3->tmp.dh);
1421                 s->s3->tmp.dh=NULL;
1422
1423                 BN_clear_free(pub);
1424                 pub=NULL;
1425                 s->session->master_key_length=
1426                         s->method->ssl3_enc->generate_master_secret(s,
1427                                 s->session->master_key,p,i);
1428                 }
1429         else
1430 #endif
1431 #ifndef NO_KRB5
1432         if (l & SSL_kKRB5)
1433                 {
1434                 krb5_error_code krb5rc;
1435                 KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1436
1437                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1438                 if ((krb5rc = kssl_sget_tkt(kssl_ctx,
1439                         s->init_buf->data, s->init_buf->length,
1440                         &kssl_err)) != 0)
1441                         {
1442 #ifdef KSSL_DEBUG
1443                         printf("kssl_sget_tkt rtn %d [%d]\n",
1444                                 krb5rc, kssl_err.reason);
1445                         if (kssl_err.text)
1446                                 printf("kssl_err text= %s\n", kssl_err.text);
1447 #endif  /* KSSL_DEBUG */
1448                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1449                                 kssl_err.reason);
1450                         goto err;
1451                         }
1452
1453 #ifdef KSSL_DEBUG
1454                 kssl_ctx_show(kssl_ctx);
1455 #endif  /* KSSL_DEBUG */
1456
1457                 /*      19991013 VRS -  3DES is kind of bogus here,
1458                 **      at least until Kerberos supports 3DES.  The only
1459                 **      real secret is the 8-byte Kerberos session key;
1460                 **      the other key material (client_random, server_random)
1461                 **      could be sniffed.  Nonces may help against replays though.
1462                 **
1463                 **      Alternate code for Kerberos Purists:
1464                 **
1465                 **      memcpy(s->session->master_key,  kssl_ctx->key, kssl_ctx->length);
1466                 **      s->session->master_key_length = kssl_ctx->length;
1467                 */
1468                 s->session->master_key_length=
1469                         s->method->ssl3_enc->generate_master_secret(s,
1470                                 s->session->master_key, kssl_ctx->key, kssl_ctx->length);
1471                 /*      Was doing kssl_ctx_free() here, but it caused problems for apache.
1472                 **      kssl_ctx = kssl_ctx_free(kssl_ctx);
1473                 **      if (s->kssl_ctx)  s->kssl_ctx = NULL;
1474                 */
1475                 }
1476         else
1477 #endif  /* NO_KRB5 */
1478                 {
1479                 al=SSL_AD_HANDSHAKE_FAILURE;
1480                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1481                 goto f_err;
1482                 }
1483
1484         return(1);
1485 f_err:
1486         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1487 #if !defined(NO_DH) || !defined(NO_RSA)
1488 err:
1489 #endif
1490         return(-1);
1491         }
1492
1493 static int ssl3_get_cert_verify(SSL *s)
1494         {
1495         EVP_PKEY *pkey=NULL;
1496         unsigned char *p;
1497         int al,ok,ret=0;
1498         long n;
1499         int type=0,i,j;
1500         X509 *peer;
1501
1502         n=ssl3_get_message(s,
1503                 SSL3_ST_SR_CERT_VRFY_A,
1504                 SSL3_ST_SR_CERT_VRFY_B,
1505                 -1,
1506                 512, /* 512? */
1507                 &ok);
1508
1509         if (!ok) return((int)n);
1510
1511         if (s->session->peer != NULL)
1512                 {
1513                 peer=s->session->peer;
1514                 pkey=X509_get_pubkey(peer);
1515                 type=X509_certificate_type(peer,pkey);
1516                 }
1517         else
1518                 {
1519                 peer=NULL;
1520                 pkey=NULL;
1521                 }
1522
1523         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1524                 {
1525                 s->s3->tmp.reuse_message=1;
1526                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1527                         {
1528                         al=SSL_AD_UNEXPECTED_MESSAGE;
1529                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1530                         goto f_err;
1531                         }
1532                 ret=1;
1533                 goto end;
1534                 }
1535
1536         if (peer == NULL)
1537                 {
1538                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1539                 al=SSL_AD_UNEXPECTED_MESSAGE;
1540                 goto f_err;
1541                 }
1542
1543         if (!(type & EVP_PKT_SIGN))
1544                 {
1545                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1546                 al=SSL_AD_ILLEGAL_PARAMETER;
1547                 goto f_err;
1548                 }
1549
1550         if (s->s3->change_cipher_spec)
1551                 {
1552                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1553                 al=SSL_AD_UNEXPECTED_MESSAGE;
1554                 goto f_err;
1555                 }
1556
1557         /* we now have a signature that we need to verify */
1558         p=(unsigned char *)s->init_buf->data;
1559         n2s(p,i);
1560         n-=2;
1561         if (i > n)
1562                 {
1563                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1564                 al=SSL_AD_DECODE_ERROR;
1565                 goto f_err;
1566                 }
1567
1568         j=EVP_PKEY_size(pkey);
1569         if ((i > j) || (n > j) || (n <= 0))
1570                 {
1571                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1572                 al=SSL_AD_DECODE_ERROR;
1573                 goto f_err;
1574                 }
1575
1576 #ifndef NO_RSA 
1577         if (pkey->type == EVP_PKEY_RSA)
1578                 {
1579                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1580                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
1581                                                         pkey->pkey.rsa);
1582                 if (i < 0)
1583                         {
1584                         al=SSL_AD_DECRYPT_ERROR;
1585                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1586                         goto f_err;
1587                         }
1588                 if (i == 0)
1589                         {
1590                         al=SSL_AD_DECRYPT_ERROR;
1591                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1592                         goto f_err;
1593                         }
1594                 }
1595         else
1596 #endif
1597 #ifndef NO_DSA
1598                 if (pkey->type == EVP_PKEY_DSA)
1599                 {
1600                 j=DSA_verify(pkey->save_type,
1601                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1602                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1603                 if (j <= 0)
1604                         {
1605                         /* bad signature */
1606                         al=SSL_AD_DECRYPT_ERROR;
1607                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1608                         goto f_err;
1609                         }
1610                 }
1611         else
1612 #endif
1613                 {
1614                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1615                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1616                 goto f_err;
1617                 }
1618
1619
1620         ret=1;
1621         if (0)
1622                 {
1623 f_err:
1624                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1625                 }
1626 end:
1627         EVP_PKEY_free(pkey);
1628         return(ret);
1629         }
1630
1631 static int ssl3_get_client_certificate(SSL *s)
1632         {
1633         int i,ok,al,ret= -1;
1634         X509 *x=NULL;
1635         unsigned long l,nc,llen,n;
1636         unsigned char *p,*d,*q;
1637         STACK_OF(X509) *sk=NULL;
1638
1639         n=ssl3_get_message(s,
1640                 SSL3_ST_SR_CERT_A,
1641                 SSL3_ST_SR_CERT_B,
1642                 -1,
1643 #if defined(MSDOS) && !defined(WIN32)
1644                 1024*30, /* 30k max cert list :-) */
1645 #else
1646                 1024*100, /* 100k max cert list :-) */
1647 #endif
1648                 &ok);
1649
1650         if (!ok) return((int)n);
1651
1652         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1653                 {
1654                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1655                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1656                         {
1657                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1658                         al=SSL_AD_HANDSHAKE_FAILURE;
1659                         goto f_err;
1660                         }
1661                 /* If tls asked for a client cert, the client must return a 0 list */
1662                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1663                         {
1664                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1665                         al=SSL_AD_UNEXPECTED_MESSAGE;
1666                         goto f_err;
1667                         }
1668                 s->s3->tmp.reuse_message=1;
1669                 return(1);
1670                 }
1671
1672         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1673                 {
1674                 al=SSL_AD_UNEXPECTED_MESSAGE;
1675                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1676                 goto f_err;
1677                 }
1678         d=p=(unsigned char *)s->init_buf->data;
1679
1680         if ((sk=sk_X509_new_null()) == NULL)
1681                 {
1682                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1683                 goto err;
1684                 }
1685
1686         n2l3(p,llen);
1687         if (llen+3 != n)
1688                 {
1689                 al=SSL_AD_DECODE_ERROR;
1690                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1691                 goto f_err;
1692                 }
1693         for (nc=0; nc<llen; )
1694                 {
1695                 n2l3(p,l);
1696                 if ((l+nc+3) > llen)
1697                         {
1698                         al=SSL_AD_DECODE_ERROR;
1699                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1700                         goto f_err;
1701                         }
1702
1703                 q=p;
1704                 x=d2i_X509(NULL,&p,l);
1705                 if (x == NULL)
1706                         {
1707                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1708                         goto err;
1709                         }
1710                 if (p != (q+l))
1711                         {
1712                         al=SSL_AD_DECODE_ERROR;
1713                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1714                         goto f_err;
1715                         }
1716                 if (!sk_X509_push(sk,x))
1717                         {
1718                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1719                         goto err;
1720                         }
1721                 x=NULL;
1722                 nc+=l+3;
1723                 }
1724
1725         if (sk_X509_num(sk) <= 0)
1726                 {
1727                 /* TLS does not mind 0 certs returned */
1728                 if (s->version == SSL3_VERSION)
1729                         {
1730                         al=SSL_AD_HANDSHAKE_FAILURE;
1731                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1732                         goto f_err;
1733                         }
1734                 /* Fail for TLS only if we required a certificate */
1735                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1736                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1737                         {
1738                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1739                         al=SSL_AD_HANDSHAKE_FAILURE;
1740                         goto f_err;
1741                         }
1742                 }
1743         else
1744                 {
1745                 i=ssl_verify_cert_chain(s,sk);
1746                 if (!i)
1747                         {
1748                         al=ssl_verify_alarm_type(s->verify_result);
1749                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1750                         goto f_err;
1751                         }
1752                 }
1753
1754         if (s->session->peer != NULL) /* This should not be needed */
1755                 X509_free(s->session->peer);
1756         s->session->peer=sk_X509_shift(sk);
1757         s->session->verify_result = s->verify_result;
1758
1759         /* With the current implementation, sess_cert will always be NULL
1760          * when we arrive here. */
1761         if (s->session->sess_cert == NULL)
1762                 {
1763                 s->session->sess_cert = ssl_sess_cert_new();
1764                 if (s->session->sess_cert == NULL)
1765                         {
1766                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1767                         goto err;
1768                         }
1769                 }
1770         if (s->session->sess_cert->cert_chain != NULL)
1771                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1772         s->session->sess_cert->cert_chain=sk;
1773         /* Inconsistency alert: cert_chain does *not* include the
1774          * peer's own certificate, while we do include it in s3_clnt.c */
1775
1776         sk=NULL;
1777
1778         ret=1;
1779         if (0)
1780                 {
1781 f_err:
1782                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1783                 }
1784 err:
1785         if (x != NULL) X509_free(x);
1786         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1787         return(ret);
1788         }
1789
1790 int ssl3_send_server_certificate(SSL *s)
1791         {
1792         unsigned long l;
1793         X509 *x;
1794
1795         if (s->state == SSL3_ST_SW_CERT_A)
1796                 {
1797                 x=ssl_get_server_send_cert(s);
1798                 if (x == NULL &&
1799                         /* VRS: allow null cert if auth == KRB5 */
1800                         (s->s3->tmp.new_cipher->algorithms
1801                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1802                         != (SSL_aKRB5|SSL_kKRB5))
1803                         {
1804                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1805                         return(0);
1806                         }
1807
1808                 l=ssl3_output_cert_chain(s,x);
1809                 s->state=SSL3_ST_SW_CERT_B;
1810                 s->init_num=(int)l;
1811                 s->init_off=0;
1812                 }
1813
1814         /* SSL3_ST_SW_CERT_B */
1815         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1816         }