Zero the premaster secret after deriving the master secret in DH
[openssl.git] / ssl / s3_clnt.c
1 /* ssl/s3_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 <openssl/buffer.h>
61 #include <openssl/rand.h>
62 #include <openssl/objects.h>
63 #include <openssl/md5.h>
64 #include <openssl/sha.h>
65 #include <openssl/evp.h>
66 #include "ssl_locl.h"
67
68 #ifndef NO_KRB5
69 #include "kssl.h"
70 #endif
71
72 static SSL_METHOD *ssl3_get_client_method(int ver);
73 static int ssl3_client_hello(SSL *s);
74 static int ssl3_get_server_hello(SSL *s);
75 static int ssl3_get_certificate_request(SSL *s);
76 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
77 static int ssl3_get_server_done(SSL *s);
78 static int ssl3_send_client_verify(SSL *s);
79 static int ssl3_send_client_certificate(SSL *s);
80 static int ssl3_send_client_key_exchange(SSL *s);
81 static int ssl3_get_key_exchange(SSL *s);
82 static int ssl3_get_server_certificate(SSL *s);
83 static int ssl3_check_cert_and_algorithm(SSL *s);
84 static SSL_METHOD *ssl3_get_client_method(int ver)
85         {
86         if (ver == SSL3_VERSION)
87                 return(SSLv3_client_method());
88         else
89                 return(NULL);
90         }
91
92 SSL_METHOD *SSLv3_client_method(void)
93         {
94         static int init=1;
95         static SSL_METHOD SSLv3_client_data;
96
97         if (init)
98                 {
99                 init=0;
100                 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
101                         sizeof(SSL_METHOD));
102                 SSLv3_client_data.ssl_connect=ssl3_connect;
103                 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
104                 }
105         return(&SSLv3_client_data);
106         }
107
108 int ssl3_connect(SSL *s)
109         {
110         BUF_MEM *buf;
111         unsigned long Time=time(NULL),l;
112         long num1;
113         void (*cb)()=NULL;
114         int ret= -1;
115         int new_state,state,skip=0;;
116
117         RAND_add(&Time,sizeof(Time),0);
118         ERR_clear_error();
119         clear_sys_error();
120
121         if (s->info_callback != NULL)
122                 cb=s->info_callback;
123         else if (s->ctx->info_callback != NULL)
124                 cb=s->ctx->info_callback;
125         
126         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
127         s->in_handshake++;
128
129         for (;;)
130                 {
131                 state=s->state;
132
133                 switch(s->state)
134                         {
135                 case SSL_ST_RENEGOTIATE:
136                         s->new_session=1;
137                         s->state=SSL_ST_CONNECT;
138                         s->ctx->stats.sess_connect_renegotiate++;
139                         /* break */
140                 case SSL_ST_BEFORE:
141                 case SSL_ST_CONNECT:
142                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
143                 case SSL_ST_OK|SSL_ST_CONNECT:
144
145                         s->server=0;
146                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
147
148                         if ((s->version & 0xff00 ) != 0x0300)
149                                 {
150                                 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_INTERNAL_ERROR);
151                                 ret = -1;
152                                 goto end;
153                                 }
154                                 
155                         /* s->version=SSL3_VERSION; */
156                         s->type=SSL_ST_CONNECT;
157
158                         if (s->init_buf == NULL)
159                                 {
160                                 if ((buf=BUF_MEM_new()) == NULL)
161                                         {
162                                         ret= -1;
163                                         goto end;
164                                         }
165                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
166                                         {
167                                         ret= -1;
168                                         goto end;
169                                         }
170                                 s->init_buf=buf;
171                                 }
172
173                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
174
175                         /* setup buffing BIO */
176                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
177
178                         /* don't push the buffering BIO quite yet */
179
180                         ssl3_init_finished_mac(s);
181
182                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
183                         s->ctx->stats.sess_connect++;
184                         s->init_num=0;
185                         break;
186
187                 case SSL3_ST_CW_CLNT_HELLO_A:
188                 case SSL3_ST_CW_CLNT_HELLO_B:
189
190                         s->shutdown=0;
191                         ret=ssl3_client_hello(s);
192                         if (ret <= 0) goto end;
193                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
194                         s->init_num=0;
195
196                         /* turn on buffering for the next lot of output */
197                         if (s->bbio != s->wbio)
198                                 s->wbio=BIO_push(s->bbio,s->wbio);
199
200                         break;
201
202                 case SSL3_ST_CR_SRVR_HELLO_A:
203                 case SSL3_ST_CR_SRVR_HELLO_B:
204                         ret=ssl3_get_server_hello(s);
205                         if (ret <= 0) goto end;
206                         if (s->hit)
207                                 s->state=SSL3_ST_CR_FINISHED_A;
208                         else
209                                 s->state=SSL3_ST_CR_CERT_A;
210                         s->init_num=0;
211                         break;
212
213                 case SSL3_ST_CR_CERT_A:
214                 case SSL3_ST_CR_CERT_B:
215                         /* Check if it is anon DH */
216                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
217                                 {
218                                 ret=ssl3_get_server_certificate(s);
219                                 if (ret <= 0) goto end;
220                                 }
221                         else
222                                 skip=1;
223                         s->state=SSL3_ST_CR_KEY_EXCH_A;
224                         s->init_num=0;
225                         break;
226
227                 case SSL3_ST_CR_KEY_EXCH_A:
228                 case SSL3_ST_CR_KEY_EXCH_B:
229                         ret=ssl3_get_key_exchange(s);
230                         if (ret <= 0) goto end;
231                         s->state=SSL3_ST_CR_CERT_REQ_A;
232                         s->init_num=0;
233
234                         /* at this point we check that we have the
235                          * required stuff from the server */
236                         if (!ssl3_check_cert_and_algorithm(s))
237                                 {
238                                 ret= -1;
239                                 goto end;
240                                 }
241                         break;
242
243                 case SSL3_ST_CR_CERT_REQ_A:
244                 case SSL3_ST_CR_CERT_REQ_B:
245                         ret=ssl3_get_certificate_request(s);
246                         if (ret <= 0) goto end;
247                         s->state=SSL3_ST_CR_SRVR_DONE_A;
248                         s->init_num=0;
249                         break;
250
251                 case SSL3_ST_CR_SRVR_DONE_A:
252                 case SSL3_ST_CR_SRVR_DONE_B:
253                         ret=ssl3_get_server_done(s);
254                         if (ret <= 0) goto end;
255                         if (s->s3->tmp.cert_req)
256                                 s->state=SSL3_ST_CW_CERT_A;
257                         else
258                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
259                         s->init_num=0;
260
261                         break;
262
263                 case SSL3_ST_CW_CERT_A:
264                 case SSL3_ST_CW_CERT_B:
265                 case SSL3_ST_CW_CERT_C:
266                 case SSL3_ST_CW_CERT_D:
267                         ret=ssl3_send_client_certificate(s);
268                         if (ret <= 0) goto end;
269                         s->state=SSL3_ST_CW_KEY_EXCH_A;
270                         s->init_num=0;
271                         break;
272
273                 case SSL3_ST_CW_KEY_EXCH_A:
274                 case SSL3_ST_CW_KEY_EXCH_B:
275                         ret=ssl3_send_client_key_exchange(s);
276                         if (ret <= 0) goto end;
277                         l=s->s3->tmp.new_cipher->algorithms;
278                         /* EAY EAY EAY need to check for DH fix cert
279                          * sent back */
280                         /* For TLS, cert_req is set to 2, so a cert chain
281                          * of nothing is sent, but no verify packet is sent */
282                         if (s->s3->tmp.cert_req == 1)
283                                 {
284                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
285                                 }
286                         else
287                                 {
288                                 s->state=SSL3_ST_CW_CHANGE_A;
289                                 s->s3->change_cipher_spec=0;
290                                 }
291
292                         s->init_num=0;
293                         break;
294
295                 case SSL3_ST_CW_CERT_VRFY_A:
296                 case SSL3_ST_CW_CERT_VRFY_B:
297                         ret=ssl3_send_client_verify(s);
298                         if (ret <= 0) goto end;
299                         s->state=SSL3_ST_CW_CHANGE_A;
300                         s->init_num=0;
301                         s->s3->change_cipher_spec=0;
302                         break;
303
304                 case SSL3_ST_CW_CHANGE_A:
305                 case SSL3_ST_CW_CHANGE_B:
306                         ret=ssl3_send_change_cipher_spec(s,
307                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
308                         if (ret <= 0) goto end;
309                         s->state=SSL3_ST_CW_FINISHED_A;
310                         s->init_num=0;
311
312                         s->session->cipher=s->s3->tmp.new_cipher;
313                         if (s->s3->tmp.new_compression == NULL)
314                                 s->session->compress_meth=0;
315                         else
316                                 s->session->compress_meth=
317                                         s->s3->tmp.new_compression->id;
318                         if (!s->method->ssl3_enc->setup_key_block(s))
319                                 {
320                                 ret= -1;
321                                 goto end;
322                                 }
323
324                         if (!s->method->ssl3_enc->change_cipher_state(s,
325                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
326                                 {
327                                 ret= -1;
328                                 goto end;
329                                 }
330
331                         break;
332
333                 case SSL3_ST_CW_FINISHED_A:
334                 case SSL3_ST_CW_FINISHED_B:
335                         ret=ssl3_send_finished(s,
336                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
337                                 s->method->ssl3_enc->client_finished_label,
338                                 s->method->ssl3_enc->client_finished_label_len);
339                         if (ret <= 0) goto end;
340                         s->state=SSL3_ST_CW_FLUSH;
341
342                         /* clear flags */
343                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
344                         if (s->hit)
345                                 {
346                                 s->s3->tmp.next_state=SSL_ST_OK;
347                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
348                                         {
349                                         s->state=SSL_ST_OK;
350                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
351                                         s->s3->delay_buf_pop_ret=0;
352                                         }
353                                 }
354                         else
355                                 {
356                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
357                                 }
358                         s->init_num=0;
359                         break;
360
361                 case SSL3_ST_CR_FINISHED_A:
362                 case SSL3_ST_CR_FINISHED_B:
363
364                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
365                                 SSL3_ST_CR_FINISHED_B);
366                         if (ret <= 0) goto end;
367
368                         if (s->hit)
369                                 s->state=SSL3_ST_CW_CHANGE_A;
370                         else
371                                 s->state=SSL_ST_OK;
372                         s->init_num=0;
373                         break;
374
375                 case SSL3_ST_CW_FLUSH:
376                         /* number of bytes to be flushed */
377                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
378                         if (num1 > 0)
379                                 {
380                                 s->rwstate=SSL_WRITING;
381                                 num1=BIO_flush(s->wbio);
382                                 if (num1 <= 0) { ret= -1; goto end; }
383                                 s->rwstate=SSL_NOTHING;
384                                 }
385
386                         s->state=s->s3->tmp.next_state;
387                         break;
388
389                 case SSL_ST_OK:
390                         /* clean a few things up */
391                         ssl3_cleanup_key_block(s);
392
393                         if (s->init_buf != NULL)
394                                 {
395                                 BUF_MEM_free(s->init_buf);
396                                 s->init_buf=NULL;
397                                 }
398
399                         /* If we are not 'joining' the last two packets,
400                          * remove the buffering now */
401                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
402                                 ssl_free_wbio_buffer(s);
403                         /* else do it later in ssl3_write */
404
405                         s->init_num=0;
406                         s->new_session=0;
407
408                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
409                         if (s->hit) s->ctx->stats.sess_hit++;
410
411                         ret=1;
412                         /* s->server=0; */
413                         s->handshake_func=ssl3_connect;
414                         s->ctx->stats.sess_connect_good++;
415
416                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
417
418                         goto end;
419                         /* break; */
420                         
421                 default:
422                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
423                         ret= -1;
424                         goto end;
425                         /* break; */
426                         }
427
428                 /* did we do anything */
429                 if (!s->s3->tmp.reuse_message && !skip)
430                         {
431                         if (s->debug)
432                                 {
433                                 if ((ret=BIO_flush(s->wbio)) <= 0)
434                                         goto end;
435                                 }
436
437                         if ((cb != NULL) && (s->state != state))
438                                 {
439                                 new_state=s->state;
440                                 s->state=state;
441                                 cb(s,SSL_CB_CONNECT_LOOP,1);
442                                 s->state=new_state;
443                                 }
444                         }
445                 skip=0;
446                 }
447 end:
448         if (cb != NULL)
449                 cb(s,SSL_CB_CONNECT_EXIT,ret);
450         s->in_handshake--;
451         return(ret);
452         }
453
454
455 static int ssl3_client_hello(SSL *s)
456         {
457         unsigned char *buf;
458         unsigned char *p,*d;
459         int i,j;
460         unsigned long Time,l;
461         SSL_COMP *comp;
462
463         buf=(unsigned char *)s->init_buf->data;
464         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
465                 {
466                 if ((s->session == NULL) ||
467                         (s->session->ssl_version != s->version) ||
468                         (s->session->not_resumable))
469                         {
470                         if (!ssl_get_new_session(s,0))
471                                 goto err;
472                         }
473                 /* else use the pre-loaded session */
474
475                 p=s->s3->client_random;
476                 Time=time(NULL);                        /* Time */
477                 l2n(Time,p);
478                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
479
480                 /* Do the message type and length last */
481                 d=p= &(buf[4]);
482
483                 *(p++)=s->version>>8;
484                 *(p++)=s->version&0xff;
485                 s->client_version=s->version;
486
487                 /* Random stuff */
488                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
489                 p+=SSL3_RANDOM_SIZE;
490
491                 /* Session ID */
492                 if (s->new_session)
493                         i=0;
494                 else
495                         i=s->session->session_id_length;
496                 *(p++)=i;
497                 if (i != 0)
498                         {
499                         memcpy(p,s->session->session_id,i);
500                         p+=i;
501                         }
502                 
503                 /* Ciphers supported */
504                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
505                 if (i == 0)
506                         {
507                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
508                         goto err;
509                         }
510                 s2n(i,p);
511                 p+=i;
512
513                 /* COMPRESSION */
514                 if (s->ctx->comp_methods == NULL)
515                         j=0;
516                 else
517                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
518                 *(p++)=1+j;
519                 for (i=0; i<j; i++)
520                         {
521                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
522                         *(p++)=comp->id;
523                         }
524                 *(p++)=0; /* Add the NULL method */
525                 
526                 l=(p-d);
527                 d=buf;
528                 *(d++)=SSL3_MT_CLIENT_HELLO;
529                 l2n3(l,d);
530
531                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
532                 /* number of bytes to write */
533                 s->init_num=p-buf;
534                 s->init_off=0;
535                 }
536
537         /* SSL3_ST_CW_CLNT_HELLO_B */
538         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
539 err:
540         return(-1);
541         }
542
543 static int ssl3_get_server_hello(SSL *s)
544         {
545         STACK_OF(SSL_CIPHER) *sk;
546         SSL_CIPHER *c;
547         unsigned char *p,*d;
548         int i,al,ok;
549         unsigned int j;
550         long n;
551         SSL_COMP *comp;
552
553         n=ssl3_get_message(s,
554                 SSL3_ST_CR_SRVR_HELLO_A,
555                 SSL3_ST_CR_SRVR_HELLO_B,
556                 SSL3_MT_SERVER_HELLO,
557                 300, /* ?? */
558                 &ok);
559
560         if (!ok) return((int)n);
561         d=p=(unsigned char *)s->init_buf->data;
562
563         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
564                 {
565                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
566                 s->version=(s->version&0xff00)|p[1];
567                 al=SSL_AD_PROTOCOL_VERSION;
568                 goto f_err;
569                 }
570         p+=2;
571
572         /* load the server hello data */
573         /* load the server random */
574         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
575         p+=SSL3_RANDOM_SIZE;
576
577         /* get the session-id */
578         j= *(p++);
579
580         if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
581                 {
582                 /* SSLref returns 16 :-( */
583                 if (j < SSL2_SSL_SESSION_ID_LENGTH)
584                         {
585                         al=SSL_AD_ILLEGAL_PARAMETER;
586                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
587                         goto f_err;
588                         }
589                 }
590         if (j != 0 && j == s->session->session_id_length
591             && memcmp(p,s->session->session_id,j) == 0)
592             {
593             if(s->sid_ctx_length != s->session->sid_ctx_length
594                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
595                 {
596                 al=SSL_AD_ILLEGAL_PARAMETER;
597                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
598                 goto f_err;
599                 }
600             s->hit=1;
601             }
602         else    /* a miss or crap from the other end */
603                 {
604                 /* If we were trying for session-id reuse, make a new
605                  * SSL_SESSION so we don't stuff up other people */
606                 s->hit=0;
607                 if (s->session->session_id_length > 0)
608                         {
609                         if (!ssl_get_new_session(s,0))
610                                 {
611                                 al=SSL_AD_INTERNAL_ERROR;
612                                 goto f_err;
613                                 }
614                         }
615                 s->session->session_id_length=j;
616                 memcpy(s->session->session_id,p,j); /* j could be 0 */
617                 }
618         p+=j;
619         c=ssl_get_cipher_by_char(s,p);
620         if (c == NULL)
621                 {
622                 /* unknown cipher */
623                 al=SSL_AD_ILLEGAL_PARAMETER;
624                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
625                 goto f_err;
626                 }
627         p+=ssl_put_cipher_by_char(s,NULL,NULL);
628
629         sk=ssl_get_ciphers_by_id(s);
630         i=sk_SSL_CIPHER_find(sk,c);
631         if (i < 0)
632                 {
633                 /* we did not say we would use this cipher */
634                 al=SSL_AD_ILLEGAL_PARAMETER;
635                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
636                 goto f_err;
637                 }
638
639         if (s->hit && (s->session->cipher != c))
640                 {
641                 if (!(s->options &
642                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
643                         {
644                         al=SSL_AD_ILLEGAL_PARAMETER;
645                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
646                         goto f_err;
647                         }
648                 }
649         s->s3->tmp.new_cipher=c;
650
651         /* lets get the compression algorithm */
652         /* COMPRESSION */
653         j= *(p++);
654         if (j == 0)
655                 comp=NULL;
656         else
657                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
658         
659         if ((j != 0) && (comp == NULL))
660                 {
661                 al=SSL_AD_ILLEGAL_PARAMETER;
662                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
663                 goto f_err;
664                 }
665         else
666                 {
667                 s->s3->tmp.new_compression=comp;
668                 }
669
670         if (p != (d+n))
671                 {
672                 /* wrong packet length */
673                 al=SSL_AD_DECODE_ERROR;
674                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
675                 goto err;
676                 }
677
678         return(1);
679 f_err:
680         ssl3_send_alert(s,SSL3_AL_FATAL,al);
681 err:
682         return(-1);
683         }
684
685 static int ssl3_get_server_certificate(SSL *s)
686         {
687         int al,i,ok,ret= -1;
688         unsigned long n,nc,llen,l;
689         X509 *x=NULL;
690         unsigned char *p,*d,*q;
691         STACK_OF(X509) *sk=NULL;
692         SESS_CERT *sc;
693         EVP_PKEY *pkey=NULL;
694         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
695
696         n=ssl3_get_message(s,
697                 SSL3_ST_CR_CERT_A,
698                 SSL3_ST_CR_CERT_B,
699                 -1,
700 #if defined(MSDOS) && !defined(WIN32)
701                 1024*30, /* 30k max cert list :-) */
702 #else
703                 1024*100, /* 100k max cert list :-) */
704 #endif
705                 &ok);
706
707         if (!ok) return((int)n);
708
709         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
710                 {
711                 s->s3->tmp.reuse_message=1;
712                 return(1);
713                 }
714
715         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
716                 {
717                 al=SSL_AD_UNEXPECTED_MESSAGE;
718                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
719                 goto f_err;
720                 }
721         d=p=(unsigned char *)s->init_buf->data;
722
723         if ((sk=sk_X509_new_null()) == NULL)
724                 {
725                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
726                 goto err;
727                 }
728
729         n2l3(p,llen);
730         if (llen+3 != n)
731                 {
732                 al=SSL_AD_DECODE_ERROR;
733                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
734                 goto f_err;
735                 }
736         for (nc=0; nc<llen; )
737                 {
738                 n2l3(p,l);
739                 if ((l+nc+3) > llen)
740                         {
741                         al=SSL_AD_DECODE_ERROR;
742                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
743                         goto f_err;
744                         }
745
746                 q=p;
747                 x=d2i_X509(NULL,&q,l);
748                 if (x == NULL)
749                         {
750                         al=SSL_AD_BAD_CERTIFICATE;
751                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
752                         goto f_err;
753                         }
754                 if (q != (p+l))
755                         {
756                         al=SSL_AD_DECODE_ERROR;
757                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
758                         goto f_err;
759                         }
760                 if (!sk_X509_push(sk,x))
761                         {
762                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
763                         goto err;
764                         }
765                 x=NULL;
766                 nc+=l+3;
767                 p=q;
768                 }
769
770         i=ssl_verify_cert_chain(s,sk);
771         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
772                 {
773                 al=ssl_verify_alarm_type(s->verify_result);
774                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
775                 goto f_err; 
776                 }
777         ERR_clear_error(); /* but we keep s->verify_result */
778
779         sc=ssl_sess_cert_new();
780         if (sc == NULL) goto err;
781
782         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
783         s->session->sess_cert=sc;
784
785         sc->cert_chain=sk;
786         /* Inconsistency alert: cert_chain does include the peer's
787          * certificate, which we don't include in s3_srvr.c */
788         x=sk_X509_value(sk,0);
789         sk=NULL;
790         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end */
791
792         pkey=X509_get_pubkey(x);
793
794         /* VRS: allow null cert if auth == KRB5 */
795         need_cert =
796                 ((s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
797                         == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
798
799 #ifdef KSSL_DEBUG
800         printf("pkey,x = %p, %p\n", pkey,x);
801         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
802         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
803                 s->s3->tmp.new_cipher->algorithms, need_cert);
804 #endif    /* KSSL_DEBUG */
805
806         if (need_cert  &&  ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
807                 {
808                 x=NULL;
809                 al=SSL3_AL_FATAL;
810                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
811                 goto f_err;
812                 }
813
814         i=ssl_cert_type(x,pkey);
815         if (need_cert && i < 0)
816                 {
817                 x=NULL;
818                 al=SSL3_AL_FATAL;
819                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
820                 goto f_err;
821                 }
822
823         if (need_cert)
824                 {
825                 sc->peer_cert_type=i;
826                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
827                 /* Why would the following ever happen?
828                  * We just created sc a couple of lines ago. */
829                 if (sc->peer_pkeys[i].x509 != NULL)
830                         X509_free(sc->peer_pkeys[i].x509);
831                 sc->peer_pkeys[i].x509=x;
832                 sc->peer_key= &(sc->peer_pkeys[i]);
833
834                 if (s->session->peer != NULL)
835                         X509_free(s->session->peer);
836                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
837                 s->session->peer=x;
838                 }
839         else
840                 {
841                 sc->peer_cert_type=i;
842                 sc->peer_key= NULL;
843
844                 if (s->session->peer != NULL)
845                         X509_free(s->session->peer);
846                 s->session->peer=NULL;
847                 }
848         s->session->verify_result = s->verify_result;
849
850         x=NULL;
851         ret=1;
852
853         if (0)
854                 {
855 f_err:
856                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
857                 }
858 err:
859         EVP_PKEY_free(pkey);
860         X509_free(x);
861         sk_X509_pop_free(sk,X509_free);
862         return(ret);
863         }
864
865 static int ssl3_get_key_exchange(SSL *s)
866         {
867 #ifndef NO_RSA
868         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
869 #endif
870         EVP_MD_CTX md_ctx;
871         unsigned char *param,*p;
872         int al,i,j,param_len,ok;
873         long n,alg;
874         EVP_PKEY *pkey=NULL;
875 #ifndef NO_RSA
876         RSA *rsa=NULL;
877 #endif
878 #ifndef NO_DH
879         DH *dh=NULL;
880 #endif
881
882         n=ssl3_get_message(s,
883                 SSL3_ST_CR_KEY_EXCH_A,
884                 SSL3_ST_CR_KEY_EXCH_B,
885                 -1,
886                 1024*8, /* ?? */
887                 &ok);
888
889         if (!ok) return((int)n);
890
891         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
892                 {
893                 s->s3->tmp.reuse_message=1;
894                 return(1);
895                 }
896
897         param=p=(unsigned char *)s->init_buf->data;
898
899         if (s->session->sess_cert != NULL)
900                 {
901 #ifndef NO_RSA
902                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
903                         {
904                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
905                         s->session->sess_cert->peer_rsa_tmp=NULL;
906                         }
907 #endif
908 #ifndef NO_DH
909                 if (s->session->sess_cert->peer_dh_tmp)
910                         {
911                         DH_free(s->session->sess_cert->peer_dh_tmp);
912                         s->session->sess_cert->peer_dh_tmp=NULL;
913                         }
914 #endif
915                 }
916         else
917                 {
918                 s->session->sess_cert=ssl_sess_cert_new();
919                 }
920
921         param_len=0;
922         alg=s->s3->tmp.new_cipher->algorithms;
923
924 #ifndef NO_RSA
925         if (alg & SSL_kRSA)
926                 {
927                 if ((rsa=RSA_new()) == NULL)
928                         {
929                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
930                         goto err;
931                         }
932                 n2s(p,i);
933                 param_len=i+2;
934                 if (param_len > n)
935                         {
936                         al=SSL_AD_DECODE_ERROR;
937                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
938                         goto f_err;
939                         }
940                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
941                         {
942                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
943                         goto err;
944                         }
945                 p+=i;
946
947                 n2s(p,i);
948                 param_len+=i+2;
949                 if (param_len > n)
950                         {
951                         al=SSL_AD_DECODE_ERROR;
952                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
953                         goto f_err;
954                         }
955                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
956                         {
957                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
958                         goto err;
959                         }
960                 p+=i;
961                 n-=param_len;
962
963                 /* this should be because we are using an export cipher */
964                 if (alg & SSL_aRSA)
965                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
966                 else
967                         {
968                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
969                         goto err;
970                         }
971                 s->session->sess_cert->peer_rsa_tmp=rsa;
972                 rsa=NULL;
973                 }
974 #else /* NO_RSA */
975         if (0)
976                 ;
977 #endif
978 #ifndef NO_DH
979         else if (alg & SSL_kEDH)
980                 {
981                 if ((dh=DH_new()) == NULL)
982                         {
983                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
984                         goto err;
985                         }
986                 n2s(p,i);
987                 param_len=i+2;
988                 if (param_len > n)
989                         {
990                         al=SSL_AD_DECODE_ERROR;
991                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
992                         goto f_err;
993                         }
994                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
995                         {
996                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
997                         goto err;
998                         }
999                 p+=i;
1000
1001                 n2s(p,i);
1002                 param_len+=i+2;
1003                 if (param_len > n)
1004                         {
1005                         al=SSL_AD_DECODE_ERROR;
1006                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1007                         goto f_err;
1008                         }
1009                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1010                         {
1011                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1012                         goto err;
1013                         }
1014                 p+=i;
1015
1016                 n2s(p,i);
1017                 param_len+=i+2;
1018                 if (param_len > n)
1019                         {
1020                         al=SSL_AD_DECODE_ERROR;
1021                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1022                         goto f_err;
1023                         }
1024                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1025                         {
1026                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1027                         goto err;
1028                         }
1029                 p+=i;
1030                 n-=param_len;
1031
1032 #ifndef NO_RSA
1033                 if (alg & SSL_aRSA)
1034                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1035 #else
1036                 if (0)
1037                         ;
1038 #endif
1039 #ifndef NO_DSA
1040                 else if (alg & SSL_aDSS)
1041                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1042 #endif
1043                 /* else anonymous DH, so no certificate or pkey. */
1044
1045                 s->session->sess_cert->peer_dh_tmp=dh;
1046                 dh=NULL;
1047                 }
1048         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1049                 {
1050                 al=SSL_AD_ILLEGAL_PARAMETER;
1051                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1052                 goto f_err;
1053                 }
1054 #endif /* !NO_DH */
1055         if (alg & SSL_aFZA)
1056                 {
1057                 al=SSL_AD_HANDSHAKE_FAILURE;
1058                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1059                 goto f_err;
1060                 }
1061
1062
1063         /* p points to the next byte, there are 'n' bytes left */
1064
1065
1066         /* if it was signed, check the signature */
1067         if (pkey != NULL)
1068                 {
1069                 n2s(p,i);
1070                 n-=2;
1071                 j=EVP_PKEY_size(pkey);
1072
1073                 if ((i != n) || (n > j) || (n <= 0))
1074                         {
1075                         /* wrong packet length */
1076                         al=SSL_AD_DECODE_ERROR;
1077                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1078                         goto f_err;
1079                         }
1080
1081 #ifndef NO_RSA
1082                 if (pkey->type == EVP_PKEY_RSA)
1083                         {
1084                         int num;
1085
1086                         j=0;
1087                         q=md_buf;
1088                         for (num=2; num > 0; num--)
1089                                 {
1090                                 EVP_DigestInit(&md_ctx,(num == 2)
1091                                         ?s->ctx->md5:s->ctx->sha1);
1092                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1093                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1094                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1095                                 EVP_DigestFinal(&md_ctx,q,(unsigned int *)&i);
1096                                 q+=i;
1097                                 j+=i;
1098                                 }
1099                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1100                                                                 pkey->pkey.rsa);
1101                         if (i < 0)
1102                                 {
1103                                 al=SSL_AD_DECRYPT_ERROR;
1104                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1105                                 goto f_err;
1106                                 }
1107                         if (i == 0)
1108                                 {
1109                                 /* bad signature */
1110                                 al=SSL_AD_DECRYPT_ERROR;
1111                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1112                                 goto f_err;
1113                                 }
1114                         }
1115                 else
1116 #endif
1117 #ifndef NO_DSA
1118                         if (pkey->type == EVP_PKEY_DSA)
1119                         {
1120                         /* lets do DSS */
1121                         EVP_VerifyInit(&md_ctx,EVP_dss1());
1122                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1123                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1124                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1125                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1126                                 {
1127                                 /* bad signature */
1128                                 al=SSL_AD_DECRYPT_ERROR;
1129                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1130                                 goto f_err;
1131                                 }
1132                         }
1133                 else
1134 #endif
1135                         {
1136                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1137                         goto err;
1138                         }
1139                 }
1140         else
1141                 {
1142                 /* still data left over */
1143                 if (!(alg & SSL_aNULL))
1144                         {
1145                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1146                         goto err;
1147                         }
1148                 if (n != 0)
1149                         {
1150                         al=SSL_AD_DECODE_ERROR;
1151                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1152                         goto f_err;
1153                         }
1154                 }
1155         EVP_PKEY_free(pkey);
1156         return(1);
1157 f_err:
1158         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1159 err:
1160         EVP_PKEY_free(pkey);
1161 #ifndef NO_RSA
1162         if (rsa != NULL)
1163                 RSA_free(rsa);
1164 #endif
1165 #ifndef NO_DH
1166         if (dh != NULL)
1167                 DH_free(dh);
1168 #endif
1169         return(-1);
1170         }
1171
1172 static int ssl3_get_certificate_request(SSL *s)
1173         {
1174         int ok,ret=0;
1175         unsigned long n,nc,l;
1176         unsigned int llen,ctype_num,i;
1177         X509_NAME *xn=NULL;
1178         unsigned char *p,*d,*q;
1179         STACK_OF(X509_NAME) *ca_sk=NULL;
1180
1181         n=ssl3_get_message(s,
1182                 SSL3_ST_CR_CERT_REQ_A,
1183                 SSL3_ST_CR_CERT_REQ_B,
1184                 -1,
1185 #if defined(MSDOS) && !defined(WIN32)
1186                 1024*30,  /* 30k max cert list :-) */
1187 #else
1188                 1024*100, /* 100k max cert list :-) */
1189 #endif
1190                 &ok);
1191
1192         if (!ok) return((int)n);
1193
1194         s->s3->tmp.cert_req=0;
1195
1196         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1197                 {
1198                 s->s3->tmp.reuse_message=1;
1199                 return(1);
1200                 }
1201
1202         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1203                 {
1204                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1205                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1206                 goto err;
1207                 }
1208
1209         /* TLS does not like anon-DH with client cert */
1210         if (s->version > SSL3_VERSION)
1211                 {
1212                 l=s->s3->tmp.new_cipher->algorithms;
1213                 if (l & SSL_aNULL)
1214                         {
1215                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1216                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1217                         goto err;
1218                         }
1219                 }
1220
1221         d=p=(unsigned char *)s->init_buf->data;
1222
1223         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1224                 {
1225                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1226                 goto err;
1227                 }
1228
1229         /* get the certificate types */
1230         ctype_num= *(p++);
1231         if (ctype_num > SSL3_CT_NUMBER)
1232                 ctype_num=SSL3_CT_NUMBER;
1233         for (i=0; i<ctype_num; i++)
1234                 s->s3->tmp.ctype[i]= p[i];
1235         p+=ctype_num;
1236
1237         /* get the CA RDNs */
1238         n2s(p,llen);
1239 #if 0
1240 {
1241 FILE *out;
1242 out=fopen("/tmp/vsign.der","w");
1243 fwrite(p,1,llen,out);
1244 fclose(out);
1245 }
1246 #endif
1247
1248         if ((llen+ctype_num+2+1) != n)
1249                 {
1250                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1251                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1252                 goto err;
1253                 }
1254
1255         for (nc=0; nc<llen; )
1256                 {
1257                 n2s(p,l);
1258                 if ((l+nc+2) > llen)
1259                         {
1260                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1261                                 goto cont; /* netscape bugs */
1262                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1263                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1264                         goto err;
1265                         }
1266
1267                 q=p;
1268
1269                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1270                         {
1271                         /* If netscape tolerance is on, ignore errors */
1272                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1273                                 goto cont;
1274                         else
1275                                 {
1276                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1277                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1278                                 goto err;
1279                                 }
1280                         }
1281
1282                 if (q != (p+l))
1283                         {
1284                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1285                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1286                         goto err;
1287                         }
1288                 if (!sk_X509_NAME_push(ca_sk,xn))
1289                         {
1290                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1291                         goto err;
1292                         }
1293
1294                 p+=l;
1295                 nc+=l+2;
1296                 }
1297
1298         if (0)
1299                 {
1300 cont:
1301                 ERR_clear_error();
1302                 }
1303
1304         /* we should setup a certificate to return.... */
1305         s->s3->tmp.cert_req=1;
1306         s->s3->tmp.ctype_num=ctype_num;
1307         if (s->s3->tmp.ca_names != NULL)
1308                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1309         s->s3->tmp.ca_names=ca_sk;
1310         ca_sk=NULL;
1311
1312         ret=1;
1313 err:
1314         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1315         return(ret);
1316         }
1317
1318 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1319         {
1320         return(X509_NAME_cmp(*a,*b));
1321         }
1322
1323 static int ssl3_get_server_done(SSL *s)
1324         {
1325         int ok,ret=0;
1326         long n;
1327
1328         n=ssl3_get_message(s,
1329                 SSL3_ST_CR_SRVR_DONE_A,
1330                 SSL3_ST_CR_SRVR_DONE_B,
1331                 SSL3_MT_SERVER_DONE,
1332                 30, /* should be very small, like 0 :-) */
1333                 &ok);
1334
1335         if (!ok) return((int)n);
1336         if (n > 0)
1337                 {
1338                 /* should contain no data */
1339                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1340                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1341                 }
1342         ret=1;
1343         return(ret);
1344         }
1345
1346 static int ssl3_send_client_key_exchange(SSL *s)
1347         {
1348         unsigned char *p,*d;
1349         int n;
1350         unsigned long l;
1351 #ifndef NO_RSA
1352         unsigned char *q;
1353         EVP_PKEY *pkey=NULL;
1354 #endif
1355 #ifndef NO_KRB5
1356         KSSL_ERR kssl_err;
1357 #endif /* NO_KRB5 */
1358
1359         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1360                 {
1361                 d=(unsigned char *)s->init_buf->data;
1362                 p= &(d[4]);
1363
1364                 l=s->s3->tmp.new_cipher->algorithms;
1365
1366                 /* Fool emacs indentation */
1367                 if (0) {}
1368 #ifndef NO_RSA
1369                 else if (l & SSL_kRSA)
1370                         {
1371                         RSA *rsa;
1372                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1373
1374                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1375                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1376                         else
1377                                 {
1378                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1379                                 if ((pkey == NULL) ||
1380                                         (pkey->type != EVP_PKEY_RSA) ||
1381                                         (pkey->pkey.rsa == NULL))
1382                                         {
1383                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1384                                         goto err;
1385                                         }
1386                                 rsa=pkey->pkey.rsa;
1387                                 EVP_PKEY_free(pkey);
1388                                 }
1389                                 
1390                         tmp_buf[0]=s->client_version>>8;
1391                         tmp_buf[1]=s->client_version&0xff;
1392                         if (RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2) <= 0)
1393                                         goto err;
1394
1395                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1396
1397                         q=p;
1398                         /* Fix buf for TLS and beyond */
1399                         if (s->version > SSL3_VERSION)
1400                                 p+=2;
1401                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1402                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1403 #ifdef PKCS1_CHECK
1404                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1405                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1406 #endif
1407                         if (n <= 0)
1408                                 {
1409                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1410                                 goto err;
1411                                 }
1412
1413                         /* Fix buf for TLS and beyond */
1414                         if (s->version > SSL3_VERSION)
1415                                 {
1416                                 s2n(n,q);
1417                                 n+=2;
1418                                 }
1419
1420                         s->session->master_key_length=
1421                                 s->method->ssl3_enc->generate_master_secret(s,
1422                                         s->session->master_key,
1423                                         tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1424                         memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1425                         }
1426 #endif
1427 #ifndef NO_KRB5
1428                 else if (l & SSL_kKRB5)
1429                         {
1430                         krb5_error_code krb5rc;
1431                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1432                         krb5_data       krb5_ap_req;
1433
1434 #ifdef KSSL_DEBUG
1435                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1436                                 l, SSL_kKRB5);
1437 #endif  /* KSSL_DEBUG */
1438
1439                         /*
1440                         **      Tried to send random tmp_buf[] as PMS in Kerberos ticket
1441                         **      by passing  krb5_mk_req_extended(ctx,authctx,opts, tmp_buf, ...)
1442                         **      but: I can't retrieve the PMS on the other side!  There is
1443                         **      some indication in the krb5 source that this is only used
1444                         **      to generate a checksum.  OTOH, the Tung book shows data
1445                         **      ("GET widget01.txt") being passed in krb5_mk_req_extended()
1446                         **      by way of krb5_sendauth().  I don't get it.
1447                         **      Until Kerberos goes 3DES, the big PMS secret would only be
1448                         **      encrypted in 1-DES anyway.  So losing the PMS shouldn't be
1449                         **      a big deal.
1450                         */
1451                         krb5rc = kssl_cget_tkt(kssl_ctx, &krb5_ap_req,
1452                                 &kssl_err);
1453 #ifdef KSSL_DEBUG
1454                         {
1455                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1456                         kssl_ctx_show(kssl_ctx);
1457                         if (krb5rc && kssl_err.text)
1458                                 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1459                         }
1460 #endif  /* KSSL_DEBUG */
1461
1462                         if (krb5rc)
1463                                 {
1464                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1465                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
1466                                 goto err;
1467                                 }
1468
1469                         /*      Send ticket (copy to *p, set n = length)
1470                          */
1471                         n = krb5_ap_req.length;
1472                         memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1473                         if (krb5_ap_req.data)  
1474                                 kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1475
1476                         /*      19991013 VRS -  3DES is kind of bogus here,
1477                         **      at least until Kerberos supports 3DES.  The only
1478                         **      real secret is the 8-byte Kerberos session key;
1479                         **      the other key material ((s->) client_random, server_random)
1480                         **      could be sniffed.  Mixing in these nonces should help
1481                         **      protect against replay attacks, however.
1482                         **
1483                         **      Alternate code for Kerberos Purists:
1484                         **
1485                         **      memcpy(s->session->master_key, kssl_ctx->key, kssl_ctx->length);
1486                         **      s->session->master_key_length = kssl_ctx->length;
1487                         */
1488                         s->session->master_key_length=
1489                                 s->method->ssl3_enc->generate_master_secret(s,
1490                                         s->session->master_key, kssl_ctx->key,kssl_ctx->length);
1491                         }
1492 #endif
1493 #ifndef NO_DH
1494                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1495                         {
1496                         DH *dh_srvr,*dh_clnt;
1497
1498                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1499                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1500                         else
1501                                 {
1502                                 /* we get them from the cert */
1503                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1504                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1505                                 goto err;
1506                                 }
1507                         
1508                         /* generate a new random key */
1509                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1510                                 {
1511                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1512                                 goto err;
1513                                 }
1514                         if (!DH_generate_key(dh_clnt))
1515                                 {
1516                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1517                                 goto err;
1518                                 }
1519
1520                         /* use the 'p' output buffer for the DH key, but
1521                          * make sure to clear it out afterwards */
1522
1523                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1524
1525                         if (n <= 0)
1526                                 {
1527                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1528                                 goto err;
1529                                 }
1530
1531                         /* generate master key from the result */
1532                         s->session->master_key_length=
1533                                 s->method->ssl3_enc->generate_master_secret(s,
1534                                         s->session->master_key,p,n);
1535                         /* clean up */
1536                         memset(p,0,n);
1537
1538                         /* send off the data */
1539                         n=BN_num_bytes(dh_clnt->pub_key);
1540                         s2n(n,p);
1541                         BN_bn2bin(dh_clnt->pub_key,p);
1542                         n+=2;
1543
1544                         DH_free(dh_clnt);
1545
1546                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1547                         }
1548 #endif
1549                 else
1550                         {
1551                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1552                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1553                         goto err;
1554                         }
1555                 
1556                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1557                 l2n3(n,d);
1558
1559                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1560                 /* number of bytes to write */
1561                 s->init_num=n+4;
1562                 s->init_off=0;
1563                 }
1564
1565         /* SSL3_ST_CW_KEY_EXCH_B */
1566         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1567 err:
1568         return(-1);
1569         }
1570
1571 static int ssl3_send_client_verify(SSL *s)
1572         {
1573         unsigned char *p,*d;
1574         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1575         EVP_PKEY *pkey;
1576 #ifndef NO_RSA
1577         unsigned u=0;
1578 #endif
1579         unsigned long n;
1580 #ifndef NO_DSA
1581         int j;
1582 #endif
1583
1584         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1585                 {
1586                 d=(unsigned char *)s->init_buf->data;
1587                 p= &(d[4]);
1588                 pkey=s->cert->key->privatekey;
1589
1590                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1591                         &(data[MD5_DIGEST_LENGTH]));
1592
1593 #ifndef NO_RSA
1594                 if (pkey->type == EVP_PKEY_RSA)
1595                         {
1596                         s->method->ssl3_enc->cert_verify_mac(s,
1597                                 &(s->s3->finish_dgst1),&(data[0]));
1598                         if (RSA_sign(NID_md5_sha1, data,
1599                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1600                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1601                                 {
1602                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1603                                 goto err;
1604                                 }
1605                         s2n(u,p);
1606                         n=u+2;
1607                         }
1608                 else
1609 #endif
1610 #ifndef NO_DSA
1611                         if (pkey->type == EVP_PKEY_DSA)
1612                         {
1613                         if (!DSA_sign(pkey->save_type,
1614                                 &(data[MD5_DIGEST_LENGTH]),
1615                                 SHA_DIGEST_LENGTH,&(p[2]),
1616                                 (unsigned int *)&j,pkey->pkey.dsa))
1617                                 {
1618                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1619                                 goto err;
1620                                 }
1621                         s2n(j,p);
1622                         n=j+2;
1623                         }
1624                 else
1625 #endif
1626                         {
1627                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,SSL_R_INTERNAL_ERROR);
1628                         goto err;
1629                         }
1630                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1631                 l2n3(n,d);
1632
1633                 s->init_num=(int)n+4;
1634                 s->init_off=0;
1635                 }
1636         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1637 err:
1638         return(-1);
1639         }
1640
1641 static int ssl3_send_client_certificate(SSL *s)
1642         {
1643         X509 *x509=NULL;
1644         EVP_PKEY *pkey=NULL;
1645         int i;
1646         unsigned long l;
1647
1648         if (s->state == SSL3_ST_CW_CERT_A)
1649                 {
1650                 if ((s->cert == NULL) ||
1651                         (s->cert->key->x509 == NULL) ||
1652                         (s->cert->key->privatekey == NULL))
1653                         s->state=SSL3_ST_CW_CERT_B;
1654                 else
1655                         s->state=SSL3_ST_CW_CERT_C;
1656                 }
1657
1658         /* We need to get a client cert */
1659         if (s->state == SSL3_ST_CW_CERT_B)
1660                 {
1661                 /* If we get an error, we need to
1662                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1663                  * We then get retied later */
1664                 i=0;
1665                 if (s->ctx->client_cert_cb != NULL)
1666                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1667                 if (i < 0)
1668                         {
1669                         s->rwstate=SSL_X509_LOOKUP;
1670                         return(-1);
1671                         }
1672                 s->rwstate=SSL_NOTHING;
1673                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1674                         {
1675                         s->state=SSL3_ST_CW_CERT_B;
1676                         if (    !SSL_use_certificate(s,x509) ||
1677                                 !SSL_use_PrivateKey(s,pkey))
1678                                 i=0;
1679                         }
1680                 else if (i == 1)
1681                         {
1682                         i=0;
1683                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1684                         }
1685
1686                 if (x509 != NULL) X509_free(x509);
1687                 if (pkey != NULL) EVP_PKEY_free(pkey);
1688                 if (i == 0)
1689                         {
1690                         if (s->version == SSL3_VERSION)
1691                                 {
1692                                 s->s3->tmp.cert_req=0;
1693                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1694                                 return(1);
1695                                 }
1696                         else
1697                                 {
1698                                 s->s3->tmp.cert_req=2;
1699                                 }
1700                         }
1701
1702                 /* Ok, we have a cert */
1703                 s->state=SSL3_ST_CW_CERT_C;
1704                 }
1705
1706         if (s->state == SSL3_ST_CW_CERT_C)
1707                 {
1708                 s->state=SSL3_ST_CW_CERT_D;
1709                 l=ssl3_output_cert_chain(s,
1710                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1711                 s->init_num=(int)l;
1712                 s->init_off=0;
1713                 }
1714         /* SSL3_ST_CW_CERT_D */
1715         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1716         }
1717
1718 #define has_bits(i,m)   (((i)&(m)) == (m))
1719
1720 static int ssl3_check_cert_and_algorithm(SSL *s)
1721         {
1722         int i,idx;
1723         long algs;
1724         EVP_PKEY *pkey=NULL;
1725         SESS_CERT *sc;
1726 #ifndef NO_RSA
1727         RSA *rsa;
1728 #endif
1729 #ifndef NO_DH
1730         DH *dh;
1731 #endif
1732
1733         sc=s->session->sess_cert;
1734
1735         if (sc == NULL)
1736                 {
1737                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_INTERNAL_ERROR);
1738                 goto err;
1739                 }
1740
1741         algs=s->s3->tmp.new_cipher->algorithms;
1742
1743         /* we don't have a certificate */
1744         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
1745                 return(1);
1746
1747 #ifndef NO_RSA
1748         rsa=s->session->sess_cert->peer_rsa_tmp;
1749 #endif
1750 #ifndef NO_DH
1751         dh=s->session->sess_cert->peer_dh_tmp;
1752 #endif
1753
1754         /* This is the passed certificate */
1755
1756         idx=sc->peer_cert_type;
1757         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1758         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1759         EVP_PKEY_free(pkey);
1760
1761         
1762         /* Check that we have a certificate if we require one */
1763         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1764                 {
1765                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1766                 goto f_err;
1767                 }
1768 #ifndef NO_DSA
1769         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1770                 {
1771                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1772                 goto f_err;
1773                 }
1774 #endif
1775 #ifndef NO_RSA
1776         if ((algs & SSL_kRSA) &&
1777                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1778                 {
1779                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1780                 goto f_err;
1781                 }
1782 #endif
1783 #ifndef NO_DH
1784         if ((algs & SSL_kEDH) &&
1785                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1786                 {
1787                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1788                 goto f_err;
1789                 }
1790         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1791                 {
1792                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1793                 goto f_err;
1794                 }
1795 #ifndef NO_DSA
1796         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1797                 {
1798                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1799                 goto f_err;
1800                 }
1801 #endif
1802 #endif
1803
1804         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
1805                 {
1806 #ifndef NO_RSA
1807                 if (algs & SSL_kRSA)
1808                         {
1809                         if (rsa == NULL
1810                             || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1811                                 {
1812                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1813                                 goto f_err;
1814                                 }
1815                         }
1816                 else
1817 #endif
1818 #ifndef NO_DH
1819                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1820                             {
1821                             if (dh == NULL
1822                                 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1823                                 {
1824                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1825                                 goto f_err;
1826                                 }
1827                         }
1828                 else
1829 #endif
1830                         {
1831                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1832                         goto f_err;
1833                         }
1834                 }
1835         return(1);
1836 f_err:
1837         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1838 err:
1839         return(0);
1840         }
1841