Introduce limits to prevent malicious keys being able to
[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  * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124
125 #define REUSE_CIPHER_BUG
126 #define NETSCAPE_HANG_BUG
127
128 #include <stdio.h>
129 #include "ssl_locl.h"
130 #include "kssl_lcl.h"
131 #include <openssl/buffer.h>
132 #include <openssl/rand.h>
133 #include <openssl/objects.h>
134 #include <openssl/evp.h>
135 #include <openssl/x509.h>
136 #ifndef OPENSSL_NO_DH
137 #include <openssl/dh.h>
138 #endif
139 #include <openssl/bn.h>
140 #ifndef OPENSSL_NO_KRB5
141 #include <openssl/krb5_asn.h>
142 #endif
143 #include <openssl/md5.h>
144
145 static SSL_METHOD *ssl3_get_server_method(int ver);
146
147 #ifndef OPENSSL_NO_ECDH
148 static int nid2curve_id(int nid);
149 #endif
150
151 static SSL_METHOD *ssl3_get_server_method(int ver)
152         {
153         if (ver == SSL3_VERSION)
154                 return(SSLv3_server_method());
155         else
156                 return(NULL);
157         }
158
159 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
160                         ssl3_accept,
161                         ssl_undefined_function,
162                         ssl3_get_server_method)
163
164 int ssl3_accept(SSL *s)
165         {
166         BUF_MEM *buf;
167         unsigned long l,Time=(unsigned long)time(NULL);
168         void (*cb)(const SSL *ssl,int type,int val)=NULL;
169         long num1;
170         int ret= -1;
171         int new_state,state,skip=0;
172
173         RAND_add(&Time,sizeof(Time),0);
174         ERR_clear_error();
175         clear_sys_error();
176
177         if (s->info_callback != NULL)
178                 cb=s->info_callback;
179         else if (s->ctx->info_callback != NULL)
180                 cb=s->ctx->info_callback;
181
182         /* init things to blank */
183         s->in_handshake++;
184         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
185
186         if (s->cert == NULL)
187                 {
188                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
189                 return(-1);
190                 }
191
192         for (;;)
193                 {
194                 state=s->state;
195
196                 switch (s->state)
197                         {
198                 case SSL_ST_RENEGOTIATE:
199                         s->new_session=1;
200                         /* s->state=SSL_ST_ACCEPT; */
201
202                 case SSL_ST_BEFORE:
203                 case SSL_ST_ACCEPT:
204                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
205                 case SSL_ST_OK|SSL_ST_ACCEPT:
206
207                         s->server=1;
208                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
209
210                         if ((s->version>>8) != 3)
211                                 {
212                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
213                                 return -1;
214                                 }
215                         s->type=SSL_ST_ACCEPT;
216
217                         if (s->init_buf == NULL)
218                                 {
219                                 if ((buf=BUF_MEM_new()) == NULL)
220                                         {
221                                         ret= -1;
222                                         goto end;
223                                         }
224                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
225                                         {
226                                         ret= -1;
227                                         goto end;
228                                         }
229                                 s->init_buf=buf;
230                                 }
231
232                         if (!ssl3_setup_buffers(s))
233                                 {
234                                 ret= -1;
235                                 goto end;
236                                 }
237
238                         s->init_num=0;
239
240                         if (s->state != SSL_ST_RENEGOTIATE)
241                                 {
242                                 /* Ok, we now need to push on a buffering BIO so that
243                                  * the output is sent in a way that TCP likes :-)
244                                  */
245                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
246                                 
247                                 ssl3_init_finished_mac(s);
248                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
249                                 s->ctx->stats.sess_accept++;
250                                 }
251                         else
252                                 {
253                                 /* s->state == SSL_ST_RENEGOTIATE,
254                                  * we will just send a HelloRequest */
255                                 s->ctx->stats.sess_accept_renegotiate++;
256                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
257                                 }
258                         break;
259
260                 case SSL3_ST_SW_HELLO_REQ_A:
261                 case SSL3_ST_SW_HELLO_REQ_B:
262
263                         s->shutdown=0;
264                         ret=ssl3_send_hello_request(s);
265                         if (ret <= 0) goto end;
266                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
267                         s->state=SSL3_ST_SW_FLUSH;
268                         s->init_num=0;
269
270                         ssl3_init_finished_mac(s);
271                         break;
272
273                 case SSL3_ST_SW_HELLO_REQ_C:
274                         s->state=SSL_ST_OK;
275                         break;
276
277                 case SSL3_ST_SR_CLNT_HELLO_A:
278                 case SSL3_ST_SR_CLNT_HELLO_B:
279                 case SSL3_ST_SR_CLNT_HELLO_C:
280
281                         s->shutdown=0;
282                         ret=ssl3_get_client_hello(s);
283                         if (ret <= 0) goto end;
284                         s->new_session = 2;
285                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
286                         s->init_num=0;
287                         break;
288
289                 case SSL3_ST_SW_SRVR_HELLO_A:
290                 case SSL3_ST_SW_SRVR_HELLO_B:
291                         ret=ssl3_send_server_hello(s);
292                         if (ret <= 0) goto end;
293
294                         if (s->hit)
295                                 s->state=SSL3_ST_SW_CHANGE_A;
296                         else
297                                 s->state=SSL3_ST_SW_CERT_A;
298                         s->init_num=0;
299                         break;
300
301                 case SSL3_ST_SW_CERT_A:
302                 case SSL3_ST_SW_CERT_B:
303                         /* Check if it is anon DH or anon ECDH */
304                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
305                                 {
306                                 ret=ssl3_send_server_certificate(s);
307                                 if (ret <= 0) goto end;
308                                 }
309                         else
310                                 skip=1;
311                         s->state=SSL3_ST_SW_KEY_EXCH_A;
312                         s->init_num=0;
313                         break;
314
315                 case SSL3_ST_SW_KEY_EXCH_A:
316                 case SSL3_ST_SW_KEY_EXCH_B:
317                         l=s->s3->tmp.new_cipher->algorithms;
318
319                         /* clear this, it may get reset by
320                          * send_server_key_exchange */
321                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
322 #ifndef OPENSSL_NO_KRB5
323                                 && !(l & SSL_KRB5)
324 #endif /* OPENSSL_NO_KRB5 */
325                                 )
326                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
327                                  * even when forbidden by protocol specs
328                                  * (handshake may fail as clients are not required to
329                                  * be able to handle this) */
330                                 s->s3->tmp.use_rsa_tmp=1;
331                         else
332                                 s->s3->tmp.use_rsa_tmp=0;
333
334
335                         /* only send if a DH key exchange, fortezza or
336                          * RSA but we have a sign only certificate
337                          *
338                          * For ECC ciphersuites, we send a serverKeyExchange
339                          * message only if the cipher suite is either
340                          * ECDH-anon or ECDHE. In other cases, the
341                          * server certificate contains the server's 
342                          * public key for key exchange.
343                          */
344                         if (s->s3->tmp.use_rsa_tmp
345                             || (l & SSL_kECDHE)
346                             || (l & (SSL_DH|SSL_kFZA))
347                             || ((l & SSL_kRSA)
348                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
349                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
350                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
351                                         )
352                                     )
353                                 )
354                             )
355                                 {
356                                 ret=ssl3_send_server_key_exchange(s);
357                                 if (ret <= 0) goto end;
358                                 }
359                         else
360                                 skip=1;
361
362                         s->state=SSL3_ST_SW_CERT_REQ_A;
363                         s->init_num=0;
364                         break;
365
366                 case SSL3_ST_SW_CERT_REQ_A:
367                 case SSL3_ST_SW_CERT_REQ_B:
368                         if (/* don't request cert unless asked for it: */
369                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
370                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
371                                  * don't request cert during re-negotiation: */
372                                 ((s->session->peer != NULL) &&
373                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
374                                 /* never request cert in anonymous ciphersuites
375                                  * (see section "Certificate request" in SSL 3 drafts
376                                  * and in RFC 2246): */
377                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
378                                  /* ... except when the application insists on verification
379                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
380                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
381                                  /* never request cert in Kerberos ciphersuites */
382                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
383                                 {
384                                 /* no cert request */
385                                 skip=1;
386                                 s->s3->tmp.cert_request=0;
387                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
388                                 }
389                         else
390                                 {
391                                 s->s3->tmp.cert_request=1;
392                                 ret=ssl3_send_certificate_request(s);
393                                 if (ret <= 0) goto end;
394 #ifndef NETSCAPE_HANG_BUG
395                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
396 #else
397                                 s->state=SSL3_ST_SW_FLUSH;
398                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
399 #endif
400                                 s->init_num=0;
401                                 }
402                         break;
403
404                 case SSL3_ST_SW_SRVR_DONE_A:
405                 case SSL3_ST_SW_SRVR_DONE_B:
406                         ret=ssl3_send_server_done(s);
407                         if (ret <= 0) goto end;
408                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
409                         s->state=SSL3_ST_SW_FLUSH;
410                         s->init_num=0;
411                         break;
412                 
413                 case SSL3_ST_SW_FLUSH:
414                         /* number of bytes to be flushed */
415                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
416                         if (num1 > 0)
417                                 {
418                                 s->rwstate=SSL_WRITING;
419                                 num1=BIO_flush(s->wbio);
420                                 if (num1 <= 0) { ret= -1; goto end; }
421                                 s->rwstate=SSL_NOTHING;
422                                 }
423
424                         s->state=s->s3->tmp.next_state;
425                         break;
426
427                 case SSL3_ST_SR_CERT_A:
428                 case SSL3_ST_SR_CERT_B:
429                         /* Check for second client hello (MS SGC) */
430                         ret = ssl3_check_client_hello(s);
431                         if (ret <= 0)
432                                 goto end;
433                         if (ret == 2)
434                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
435                         else {
436                                 if (s->s3->tmp.cert_request)
437                                         {
438                                         ret=ssl3_get_client_certificate(s);
439                                         if (ret <= 0) goto end;
440                                         }
441                                 s->init_num=0;
442                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
443                         }
444                         break;
445
446                 case SSL3_ST_SR_KEY_EXCH_A:
447                 case SSL3_ST_SR_KEY_EXCH_B:
448                         ret=ssl3_get_client_key_exchange(s);
449                         if (ret <= 0) 
450                                 goto end;
451                         if (ret == 2)
452                                 {
453                                 /* For the ECDH ciphersuites when
454                                  * the client sends its ECDH pub key in
455                                  * a certificate, the CertificateVerify
456                                  * message is not sent.
457                                  */
458                                 s->state=SSL3_ST_SR_FINISHED_A;
459                                 s->init_num = 0;
460                                 }
461                         else   
462                                 {
463                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
464                                 s->init_num=0;
465
466                                 /* We need to get hashes here so if there is
467                                  * a client cert, it can be verified
468                                  */ 
469                                 s->method->ssl3_enc->cert_verify_mac(s,
470                                     &(s->s3->finish_dgst1),
471                                     &(s->s3->tmp.cert_verify_md[0]));
472                                 s->method->ssl3_enc->cert_verify_mac(s,
473                                     &(s->s3->finish_dgst2),
474                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
475                                 }
476                         break;
477
478                 case SSL3_ST_SR_CERT_VRFY_A:
479                 case SSL3_ST_SR_CERT_VRFY_B:
480
481                         /* we should decide if we expected this one */
482                         ret=ssl3_get_cert_verify(s);
483                         if (ret <= 0) goto end;
484
485                         s->state=SSL3_ST_SR_FINISHED_A;
486                         s->init_num=0;
487                         break;
488
489                 case SSL3_ST_SR_FINISHED_A:
490                 case SSL3_ST_SR_FINISHED_B:
491                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
492                                 SSL3_ST_SR_FINISHED_B);
493                         if (ret <= 0) goto end;
494                         if (s->hit)
495                                 s->state=SSL_ST_OK;
496                         else
497                                 s->state=SSL3_ST_SW_CHANGE_A;
498                         s->init_num=0;
499                         break;
500
501                 case SSL3_ST_SW_CHANGE_A:
502                 case SSL3_ST_SW_CHANGE_B:
503
504                         s->session->cipher=s->s3->tmp.new_cipher;
505                         if (!s->method->ssl3_enc->setup_key_block(s))
506                                 { ret= -1; goto end; }
507
508                         ret=ssl3_send_change_cipher_spec(s,
509                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
510
511                         if (ret <= 0) goto end;
512                         s->state=SSL3_ST_SW_FINISHED_A;
513                         s->init_num=0;
514
515                         if (!s->method->ssl3_enc->change_cipher_state(s,
516                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
517                                 {
518                                 ret= -1;
519                                 goto end;
520                                 }
521
522                         break;
523
524                 case SSL3_ST_SW_FINISHED_A:
525                 case SSL3_ST_SW_FINISHED_B:
526                         ret=ssl3_send_finished(s,
527                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
528                                 s->method->ssl3_enc->server_finished_label,
529                                 s->method->ssl3_enc->server_finished_label_len);
530                         if (ret <= 0) goto end;
531                         s->state=SSL3_ST_SW_FLUSH;
532                         if (s->hit)
533                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
534                         else
535                                 s->s3->tmp.next_state=SSL_ST_OK;
536                         s->init_num=0;
537                         break;
538
539                 case SSL_ST_OK:
540                         /* clean a few things up */
541                         ssl3_cleanup_key_block(s);
542
543                         BUF_MEM_free(s->init_buf);
544                         s->init_buf=NULL;
545
546                         /* remove buffering on output */
547                         ssl_free_wbio_buffer(s);
548
549                         s->init_num=0;
550
551                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
552                                 {
553                                 /* actually not necessarily a 'new' session unless
554                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
555                                 
556                                 s->new_session=0;
557                                 
558                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
559                                 
560                                 s->ctx->stats.sess_accept_good++;
561                                 /* s->server=1; */
562                                 s->handshake_func=ssl3_accept;
563
564                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
565                                 }
566                         
567                         ret = 1;
568                         goto end;
569                         /* break; */
570
571                 default:
572                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
573                         ret= -1;
574                         goto end;
575                         /* break; */
576                         }
577                 
578                 if (!s->s3->tmp.reuse_message && !skip)
579                         {
580                         if (s->debug)
581                                 {
582                                 if ((ret=BIO_flush(s->wbio)) <= 0)
583                                         goto end;
584                                 }
585
586
587                         if ((cb != NULL) && (s->state != state))
588                                 {
589                                 new_state=s->state;
590                                 s->state=state;
591                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
592                                 s->state=new_state;
593                                 }
594                         }
595                 skip=0;
596                 }
597 end:
598         /* BIO_flush(s->wbio); */
599
600         s->in_handshake--;
601         if (cb != NULL)
602                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
603         return(ret);
604         }
605
606 int ssl3_send_hello_request(SSL *s)
607         {
608         unsigned char *p;
609
610         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
611                 {
612                 p=(unsigned char *)s->init_buf->data;
613                 *(p++)=SSL3_MT_HELLO_REQUEST;
614                 *(p++)=0;
615                 *(p++)=0;
616                 *(p++)=0;
617
618                 s->state=SSL3_ST_SW_HELLO_REQ_B;
619                 /* number of bytes to write */
620                 s->init_num=4;
621                 s->init_off=0;
622                 }
623
624         /* SSL3_ST_SW_HELLO_REQ_B */
625         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
626         }
627
628 int ssl3_check_client_hello(SSL *s)
629         {
630         int ok;
631         long n;
632
633         /* this function is called when we really expect a Certificate message,
634          * so permit appropriate message length */
635         n=s->method->ssl_get_message(s,
636                 SSL3_ST_SR_CERT_A,
637                 SSL3_ST_SR_CERT_B,
638                 -1,
639                 s->max_cert_list,
640                 &ok);
641         if (!ok) return((int)n);
642         s->s3->tmp.reuse_message = 1;
643         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
644                 {
645                 /* Throw away what we have done so far in the current handshake,
646                  * which will now be aborted. (A full SSL_clear would be too much.)
647                  * I hope that tmp.dh is the only thing that may need to be cleared
648                  * when a handshake is not completed ... */
649 #ifndef OPENSSL_NO_DH
650                 if (s->s3->tmp.dh != NULL)
651                         {
652                         DH_free(s->s3->tmp.dh);
653                         s->s3->tmp.dh = NULL;
654                         }
655 #endif
656                 return 2;
657                 }
658         return 1;
659 }
660
661 int ssl3_get_client_hello(SSL *s)
662         {
663         int i,j,ok,al,ret= -1;
664         unsigned int cookie_len;
665         long n;
666         unsigned long id;
667         unsigned char *p,*d,*q;
668         SSL_CIPHER *c;
669 #ifndef OPENSSL_NO_COMP
670         SSL_COMP *comp=NULL;
671 #endif
672         STACK_OF(SSL_CIPHER) *ciphers=NULL;
673
674         /* We do this so that we will respond with our native type.
675          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
676          * This down switching should be handled by a different method.
677          * If we are SSLv3, we will respond with SSLv3, even if prompted with
678          * TLSv1.
679          */
680         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
681                 {
682                 s->first_packet=1;
683                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
684                 }
685         n=s->method->ssl_get_message(s,
686                 SSL3_ST_SR_CLNT_HELLO_B,
687                 SSL3_ST_SR_CLNT_HELLO_C,
688                 SSL3_MT_CLIENT_HELLO,
689                 SSL3_RT_MAX_PLAIN_LENGTH,
690                 &ok);
691
692         if (!ok) return((int)n);
693         d=p=(unsigned char *)s->init_msg;
694
695         /* use version from inside client hello, not from record header
696          * (may differ: see RFC 2246, Appendix E, second paragraph) */
697         s->client_version=(((int)p[0])<<8)|(int)p[1];
698         p+=2;
699
700         if (s->client_version < s->version)
701                 {
702                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
703                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR) 
704                         {
705                         /* similar to ssl3_get_record, send alert using remote version number */
706                         s->version = s->client_version;
707                         }
708                 al = SSL_AD_PROTOCOL_VERSION;
709                 goto f_err;
710                 }
711
712         /* load the client random */
713         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
714         p+=SSL3_RANDOM_SIZE;
715
716         /* get the session-id */
717         j= *(p++);
718
719         s->hit=0;
720         /* Versions before 0.9.7 always allow session reuse during renegotiation
721          * (i.e. when s->new_session is true), option
722          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
723          * Maybe this optional behaviour should always have been the default,
724          * but we cannot safely change the default behaviour (or new applications
725          * might be written that become totally unsecure when compiled with
726          * an earlier library version)
727          */
728         if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
729                 {
730                 if (!ssl_get_new_session(s,1))
731                         goto err;
732                 }
733         else
734                 {
735                 i=ssl_get_prev_session(s,p,j);
736                 if (i == 1)
737                         { /* previous session */
738                         s->hit=1;
739                         }
740                 else if (i == -1)
741                         goto err;
742                 else /* i == 0 */
743                         {
744                         if (!ssl_get_new_session(s,1))
745                                 goto err;
746                         }
747                 }
748
749         p+=j;
750
751         if (SSL_version(s) == DTLS1_VERSION)
752                 {
753                 /* cookie stuff */
754                 cookie_len = *(p++);
755
756                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
757                         s->d1->send_cookie == 0)
758                         {
759                         /* HelloVerifyMessage has already been sent */
760                         if ( cookie_len != s->d1->cookie_len)
761                                 {
762                                 al = SSL_AD_HANDSHAKE_FAILURE;
763                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
764                                 goto f_err;
765                                 }
766                         }
767
768                 /* 
769                  * The ClientHello may contain a cookie even if the
770                  * HelloVerify message has not been sent--make sure that it
771                  * does not cause an overflow.
772                  */
773                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
774                         {
775                         /* too much data */
776                         al = SSL_AD_DECODE_ERROR;
777                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
778                         goto f_err;
779                         }
780
781                 /* verify the cookie if appropriate option is set. */
782                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
783                         cookie_len > 0)
784                         {
785                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
786
787                         if ( s->ctx->app_verify_cookie_cb != NULL)
788                                 {
789                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
790                                         cookie_len) == 0)
791                                         {
792                                         al=SSL_AD_HANDSHAKE_FAILURE;
793                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
794                                                 SSL_R_COOKIE_MISMATCH);
795                                         goto f_err;
796                                         }
797                                 /* else cookie verification succeeded */
798                                 }
799                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
800                                                   s->d1->cookie_len) != 0) /* default verification */
801                                 {
802                                         al=SSL_AD_HANDSHAKE_FAILURE;
803                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
804                                                 SSL_R_COOKIE_MISMATCH);
805                                         goto f_err;
806                                 }
807                         }
808
809                 p += cookie_len;
810                 }
811
812         n2s(p,i);
813         if ((i == 0) && (j != 0))
814                 {
815                 /* we need a cipher if we are not resuming a session */
816                 al=SSL_AD_ILLEGAL_PARAMETER;
817                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
818                 goto f_err;
819                 }
820         if ((p+i) >= (d+n))
821                 {
822                 /* not enough data */
823                 al=SSL_AD_DECODE_ERROR;
824                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
825                 goto f_err;
826                 }
827         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
828                 == NULL))
829                 {
830                 goto err;
831                 }
832         p+=i;
833
834         /* If it is a hit, check that the cipher is in the list */
835         if ((s->hit) && (i > 0))
836                 {
837                 j=0;
838                 id=s->session->cipher->id;
839
840 #ifdef CIPHER_DEBUG
841                 printf("client sent %d ciphers\n",sk_num(ciphers));
842 #endif
843                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
844                         {
845                         c=sk_SSL_CIPHER_value(ciphers,i);
846 #ifdef CIPHER_DEBUG
847                         printf("client [%2d of %2d]:%s\n",
848                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
849 #endif
850                         if (c->id == id)
851                                 {
852                                 j=1;
853                                 break;
854                                 }
855                         }
856                 if (j == 0)
857                         {
858                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
859                                 {
860                                 /* Very bad for multi-threading.... */
861                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers, 0);
862                                 }
863                         else
864                                 {
865                                 /* we need to have the cipher in the cipher
866                                  * list if we are asked to reuse it */
867                                 al=SSL_AD_ILLEGAL_PARAMETER;
868                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
869                                 goto f_err;
870                                 }
871                         }
872                 }
873
874         /* compression */
875         i= *(p++);
876         if ((p+i) > (d+n))
877                 {
878                 /* not enough data */
879                 al=SSL_AD_DECODE_ERROR;
880                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
881                 goto f_err;
882                 }
883         q=p;
884         for (j=0; j<i; j++)
885                 {
886                 if (p[j] == 0) break;
887                 }
888
889         p+=i;
890         if (j >= i)
891                 {
892                 /* no compress */
893                 al=SSL_AD_DECODE_ERROR;
894                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
895                 goto f_err;
896                 }
897
898         /* Worst case, we will use the NULL compression, but if we have other
899          * options, we will now look for them.  We have i-1 compression
900          * algorithms from the client, starting at q. */
901         s->s3->tmp.new_compression=NULL;
902 #ifndef OPENSSL_NO_COMP
903         if (s->ctx->comp_methods != NULL)
904                 { /* See if we have a match */
905                 int m,nn,o,v,done=0;
906
907                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
908                 for (m=0; m<nn; m++)
909                         {
910                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
911                         v=comp->id;
912                         for (o=0; o<i; o++)
913                                 {
914                                 if (v == q[o])
915                                         {
916                                         done=1;
917                                         break;
918                                         }
919                                 }
920                         if (done) break;
921                         }
922                 if (done)
923                         s->s3->tmp.new_compression=comp;
924                 else
925                         comp=NULL;
926                 }
927 #endif
928
929         /* TLS does not mind if there is extra stuff */
930 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
931          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
932          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
933         if (s->version == SSL3_VERSION)
934                 {
935                 if (p < (d+n))
936                         {
937                         /* wrong number of bytes,
938                          * there could be more to follow */
939                         al=SSL_AD_DECODE_ERROR;
940                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
941                         goto f_err;
942                         }
943                 }
944 #endif
945
946         /* Given s->session->ciphers and SSL_get_ciphers, we must
947          * pick a cipher */
948
949         if (!s->hit)
950                 {
951 #ifdef OPENSSL_NO_COMP
952                 s->session->compress_meth=0;
953 #else
954                 s->session->compress_meth=(comp == NULL)?0:comp->id;
955 #endif
956                 if (s->session->ciphers != NULL)
957                         sk_SSL_CIPHER_free(s->session->ciphers);
958                 s->session->ciphers=ciphers;
959                 if (ciphers == NULL)
960                         {
961                         al=SSL_AD_ILLEGAL_PARAMETER;
962                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
963                         goto f_err;
964                         }
965                 ciphers=NULL;
966                 c=ssl3_choose_cipher(s,s->session->ciphers,
967                                      SSL_get_ciphers(s));
968
969                 if (c == NULL)
970                         {
971                         al=SSL_AD_HANDSHAKE_FAILURE;
972                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
973                         goto f_err;
974                         }
975                 s->s3->tmp.new_cipher=c;
976                 }
977         else
978                 {
979                 /* Session-id reuse */
980 #ifdef REUSE_CIPHER_BUG
981                 STACK_OF(SSL_CIPHER) *sk;
982                 SSL_CIPHER *nc=NULL;
983                 SSL_CIPHER *ec=NULL;
984
985                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
986                         {
987                         sk=s->session->ciphers;
988                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
989                                 {
990                                 c=sk_SSL_CIPHER_value(sk,i);
991                                 if (c->algorithms & SSL_eNULL)
992                                         nc=c;
993                                 if (SSL_C_IS_EXPORT(c))
994                                         ec=c;
995                                 }
996                         if (nc != NULL)
997                                 s->s3->tmp.new_cipher=nc;
998                         else if (ec != NULL)
999                                 s->s3->tmp.new_cipher=ec;
1000                         else
1001                                 s->s3->tmp.new_cipher=s->session->cipher;
1002                         }
1003                 else
1004 #endif
1005                 s->s3->tmp.new_cipher=s->session->cipher;
1006                 }
1007         
1008         /* we now have the following setup. 
1009          * client_random
1010          * cipher_list          - our prefered list of ciphers
1011          * ciphers              - the clients prefered list of ciphers
1012          * compression          - basically ignored right now
1013          * ssl version is set   - sslv3
1014          * s->session           - The ssl session has been setup.
1015          * s->hit               - session reuse flag
1016          * s->tmp.new_cipher    - the new cipher to use.
1017          */
1018
1019         ret=1;
1020         if (0)
1021                 {
1022 f_err:
1023                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1024                 }
1025 err:
1026         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1027         return(ret);
1028         }
1029
1030 int ssl3_send_server_hello(SSL *s)
1031         {
1032         unsigned char *buf;
1033         unsigned char *p,*d;
1034         int i,sl;
1035         unsigned long l,Time;
1036
1037         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1038                 {
1039                 buf=(unsigned char *)s->init_buf->data;
1040                 p=s->s3->server_random;
1041                 Time=(unsigned long)time(NULL);                 /* Time */
1042                 l2n(Time,p);
1043                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1044                         return -1;
1045                 /* Do the message type and length last */
1046                 d=p= &(buf[4]);
1047
1048                 *(p++)=s->version>>8;
1049                 *(p++)=s->version&0xff;
1050
1051                 /* Random stuff */
1052                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1053                 p+=SSL3_RANDOM_SIZE;
1054
1055                 /* now in theory we have 3 options to sending back the
1056                  * session id.  If it is a re-use, we send back the
1057                  * old session-id, if it is a new session, we send
1058                  * back the new session-id or we send back a 0 length
1059                  * session-id if we want it to be single use.
1060                  * Currently I will not implement the '0' length session-id
1061                  * 12-Jan-98 - I'll now support the '0' length stuff.
1062                  */
1063                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
1064                         s->session->session_id_length=0;
1065
1066                 sl=s->session->session_id_length;
1067                 if (sl > (int)sizeof(s->session->session_id))
1068                         {
1069                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1070                         return -1;
1071                         }
1072                 *(p++)=sl;
1073                 memcpy(p,s->session->session_id,sl);
1074                 p+=sl;
1075
1076                 /* put the cipher */
1077                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1078                 p+=i;
1079
1080                 /* put the compression method */
1081 #ifdef OPENSSL_NO_COMP
1082                         *(p++)=0;
1083 #else
1084                 if (s->s3->tmp.new_compression == NULL)
1085                         *(p++)=0;
1086                 else
1087                         *(p++)=s->s3->tmp.new_compression->id;
1088 #endif
1089
1090                 /* do the header */
1091                 l=(p-d);
1092                 d=buf;
1093                 *(d++)=SSL3_MT_SERVER_HELLO;
1094                 l2n3(l,d);
1095
1096                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1097                 /* number of bytes to write */
1098                 s->init_num=p-buf;
1099                 s->init_off=0;
1100                 }
1101
1102         /* SSL3_ST_CW_CLNT_HELLO_B */
1103         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1104         }
1105
1106 int ssl3_send_server_done(SSL *s)
1107         {
1108         unsigned char *p;
1109
1110         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1111                 {
1112                 p=(unsigned char *)s->init_buf->data;
1113
1114                 /* do the header */
1115                 *(p++)=SSL3_MT_SERVER_DONE;
1116                 *(p++)=0;
1117                 *(p++)=0;
1118                 *(p++)=0;
1119
1120                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1121                 /* number of bytes to write */
1122                 s->init_num=4;
1123                 s->init_off=0;
1124                 }
1125
1126         /* SSL3_ST_CW_CLNT_HELLO_B */
1127         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1128         }
1129
1130 int ssl3_send_server_key_exchange(SSL *s)
1131         {
1132 #ifndef OPENSSL_NO_RSA
1133         unsigned char *q;
1134         int j,num;
1135         RSA *rsa;
1136         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1137         unsigned int u;
1138 #endif
1139 #ifndef OPENSSL_NO_DH
1140         DH *dh=NULL,*dhp;
1141 #endif
1142 #ifndef OPENSSL_NO_ECDH
1143         EC_KEY *ecdh=NULL, *ecdhp;
1144         unsigned char *encodedPoint = NULL;
1145         int encodedlen = 0;
1146         int curve_id = 0;
1147         BN_CTX *bn_ctx = NULL; 
1148 #endif
1149         EVP_PKEY *pkey;
1150         unsigned char *p,*d;
1151         int al,i;
1152         unsigned long type;
1153         int n;
1154         CERT *cert;
1155         BIGNUM *r[4];
1156         int nr[4],kn;
1157         BUF_MEM *buf;
1158         EVP_MD_CTX md_ctx;
1159
1160         EVP_MD_CTX_init(&md_ctx);
1161         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1162                 {
1163                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1164                 cert=s->cert;
1165
1166                 buf=s->init_buf;
1167
1168                 r[0]=r[1]=r[2]=r[3]=NULL;
1169                 n=0;
1170 #ifndef OPENSSL_NO_RSA
1171                 if (type & SSL_kRSA)
1172                         {
1173                         rsa=cert->rsa_tmp;
1174                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1175                                 {
1176                                 rsa=s->cert->rsa_tmp_cb(s,
1177                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1178                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1179                                 if(rsa == NULL)
1180                                 {
1181                                         al=SSL_AD_HANDSHAKE_FAILURE;
1182                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1183                                         goto f_err;
1184                                 }
1185                                 RSA_up_ref(rsa);
1186                                 cert->rsa_tmp=rsa;
1187                                 }
1188                         if (rsa == NULL)
1189                                 {
1190                                 al=SSL_AD_HANDSHAKE_FAILURE;
1191                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1192                                 goto f_err;
1193                                 }
1194                         r[0]=rsa->n;
1195                         r[1]=rsa->e;
1196                         s->s3->tmp.use_rsa_tmp=1;
1197                         }
1198                 else
1199 #endif
1200 #ifndef OPENSSL_NO_DH
1201                         if (type & SSL_kEDH)
1202                         {
1203                         dhp=cert->dh_tmp;
1204                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1205                                 dhp=s->cert->dh_tmp_cb(s,
1206                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1207                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1208                         if (dhp == NULL)
1209                                 {
1210                                 al=SSL_AD_HANDSHAKE_FAILURE;
1211                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1212                                 goto f_err;
1213                                 }
1214
1215                         if (s->s3->tmp.dh != NULL)
1216                                 {
1217                                 DH_free(dh);
1218                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1219                                 goto err;
1220                                 }
1221
1222                         if ((dh=DHparams_dup(dhp)) == NULL)
1223                                 {
1224                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1225                                 goto err;
1226                                 }
1227
1228                         s->s3->tmp.dh=dh;
1229                         if ((dhp->pub_key == NULL ||
1230                              dhp->priv_key == NULL ||
1231                              (s->options & SSL_OP_SINGLE_DH_USE)))
1232                                 {
1233                                 if(!DH_generate_key(dh))
1234                                     {
1235                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1236                                            ERR_R_DH_LIB);
1237                                     goto err;
1238                                     }
1239                                 }
1240                         else
1241                                 {
1242                                 dh->pub_key=BN_dup(dhp->pub_key);
1243                                 dh->priv_key=BN_dup(dhp->priv_key);
1244                                 if ((dh->pub_key == NULL) ||
1245                                         (dh->priv_key == NULL))
1246                                         {
1247                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1248                                         goto err;
1249                                         }
1250                                 }
1251                         r[0]=dh->p;
1252                         r[1]=dh->g;
1253                         r[2]=dh->pub_key;
1254                         }
1255                 else 
1256 #endif
1257 #ifndef OPENSSL_NO_ECDH
1258                         if (type & SSL_kECDHE)
1259                         {
1260                         const EC_GROUP *group;
1261
1262                         ecdhp=cert->ecdh_tmp;
1263                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1264                                 {
1265                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1266                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1267                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1268                                 }
1269                         if (ecdhp == NULL)
1270                                 {
1271                                 al=SSL_AD_HANDSHAKE_FAILURE;
1272                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1273                                 goto f_err;
1274                                 }
1275
1276                         if (s->s3->tmp.ecdh != NULL)
1277                                 {
1278                                 EC_KEY_free(s->s3->tmp.ecdh); 
1279                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1280                                 goto err;
1281                                 }
1282
1283                         /* Duplicate the ECDH structure. */
1284                         if (ecdhp == NULL)
1285                                 {
1286                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1287                                 goto err;
1288                                 }
1289                         if (!EC_KEY_up_ref(ecdhp))
1290                                 {
1291                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1292                                 goto err;
1293                                 }
1294                         ecdh = ecdhp;
1295
1296                         s->s3->tmp.ecdh=ecdh;
1297                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1298                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1299                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1300                                 {
1301                                 if(!EC_KEY_generate_key(ecdh))
1302                                     {
1303                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1304                                     goto err;
1305                                     }
1306                                 }
1307
1308                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1309                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1310                             (EC_KEY_get0_private_key(ecdh) == NULL))
1311                                 {
1312                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1313                                 goto err;
1314                                 }
1315
1316                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1317                             (EC_GROUP_get_degree(group) > 163)) 
1318                                 {
1319                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1320                                 goto err;
1321                                 }
1322
1323                         /* XXX: For now, we only support ephemeral ECDH
1324                          * keys over named (not generic) curves. For 
1325                          * supported named curves, curve_id is non-zero.
1326                          */
1327                         if ((curve_id = 
1328                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1329                             == 0)
1330                                 {
1331                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1332                                 goto err;
1333                                 }
1334
1335                         /* Encode the public key.
1336                          * First check the size of encoding and
1337                          * allocate memory accordingly.
1338                          */
1339                         encodedlen = EC_POINT_point2oct(group, 
1340                             EC_KEY_get0_public_key(ecdh),
1341                             POINT_CONVERSION_UNCOMPRESSED, 
1342                             NULL, 0, NULL);
1343
1344                         encodedPoint = (unsigned char *) 
1345                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1346                         bn_ctx = BN_CTX_new();
1347                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1348                                 {
1349                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1350                                 goto err;
1351                                 }
1352
1353
1354                         encodedlen = EC_POINT_point2oct(group, 
1355                             EC_KEY_get0_public_key(ecdh), 
1356                             POINT_CONVERSION_UNCOMPRESSED, 
1357                             encodedPoint, encodedlen, bn_ctx);
1358
1359                         if (encodedlen == 0) 
1360                                 {
1361                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1362                                 goto err;
1363                                 }
1364
1365                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1366
1367                         /* XXX: For now, we only support named (not 
1368                          * generic) curves in ECDH ephemeral key exchanges.
1369                          * In this situation, we need four additional bytes
1370                          * to encode the entire ServerECDHParams
1371                          * structure. 
1372                          */
1373                         n = 4 + encodedlen;
1374
1375                         /* We'll generate the serverKeyExchange message
1376                          * explicitly so we can set these to NULLs
1377                          */
1378                         r[0]=NULL;
1379                         r[1]=NULL;
1380                         r[2]=NULL;
1381                         r[3]=NULL;
1382                         }
1383                 else 
1384 #endif /* !OPENSSL_NO_ECDH */
1385                         {
1386                         al=SSL_AD_HANDSHAKE_FAILURE;
1387                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1388                         goto f_err;
1389                         }
1390                 for (i=0; r[i] != NULL; i++)
1391                         {
1392                         nr[i]=BN_num_bytes(r[i]);
1393                         n+=2+nr[i];
1394                         }
1395
1396                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1397                         {
1398                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1399                                 == NULL)
1400                                 {
1401                                 al=SSL_AD_DECODE_ERROR;
1402                                 goto f_err;
1403                                 }
1404                         kn=EVP_PKEY_size(pkey);
1405                         }
1406                 else
1407                         {
1408                         pkey=NULL;
1409                         kn=0;
1410                         }
1411
1412                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1413                         {
1414                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1415                         goto err;
1416                         }
1417                 d=(unsigned char *)s->init_buf->data;
1418                 p= &(d[4]);
1419
1420                 for (i=0; r[i] != NULL; i++)
1421                         {
1422                         s2n(nr[i],p);
1423                         BN_bn2bin(r[i],p);
1424                         p+=nr[i];
1425                         }
1426
1427 #ifndef OPENSSL_NO_ECDH
1428                 if (type & SSL_kECDHE) 
1429                         {
1430                         /* XXX: For now, we only support named (not generic) curves.
1431                          * In this situation, the serverKeyExchange message has:
1432                          * [1 byte CurveType], [2 byte CurveName]
1433                          * [1 byte length of encoded point], followed by
1434                          * the actual encoded point itself
1435                          */
1436                         *p = NAMED_CURVE_TYPE;
1437                         p += 1;
1438                         *p = 0;
1439                         p += 1;
1440                         *p = curve_id;
1441                         p += 1;
1442                         *p = encodedlen;
1443                         p += 1;
1444                         memcpy((unsigned char*)p, 
1445                             (unsigned char *)encodedPoint, 
1446                             encodedlen);
1447                         OPENSSL_free(encodedPoint);
1448                         p += encodedlen;
1449                         }
1450 #endif
1451
1452                 /* not anonymous */
1453                 if (pkey != NULL)
1454                         {
1455                         /* n is the length of the params, they start at &(d[4])
1456                          * and p points to the space at the end. */
1457 #ifndef OPENSSL_NO_RSA
1458                         if (pkey->type == EVP_PKEY_RSA)
1459                                 {
1460                                 q=md_buf;
1461                                 j=0;
1462                                 for (num=2; num > 0; num--)
1463                                         {
1464                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1465                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1466                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1467                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1468                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1469                                         EVP_DigestFinal_ex(&md_ctx,q,
1470                                                 (unsigned int *)&i);
1471                                         q+=i;
1472                                         j+=i;
1473                                         }
1474                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1475                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1476                                         {
1477                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1478                                         goto err;
1479                                         }
1480                                 s2n(u,p);
1481                                 n+=u+2;
1482                                 }
1483                         else
1484 #endif
1485 #if !defined(OPENSSL_NO_DSA)
1486                                 if (pkey->type == EVP_PKEY_DSA)
1487                                 {
1488                                 /* lets do DSS */
1489                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1490                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1491                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1492                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1493                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1494                                         (unsigned int *)&i,pkey))
1495                                         {
1496                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1497                                         goto err;
1498                                         }
1499                                 s2n(i,p);
1500                                 n+=i+2;
1501                                 }
1502                         else
1503 #endif
1504 #if !defined(OPENSSL_NO_ECDSA)
1505                                 if (pkey->type == EVP_PKEY_EC)
1506                                 {
1507                                 /* let's do ECDSA */
1508                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1509                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1510                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1511                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1512                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1513                                         (unsigned int *)&i,pkey))
1514                                         {
1515                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1516                                         goto err;
1517                                         }
1518                                 s2n(i,p);
1519                                 n+=i+2;
1520                                 }
1521                         else
1522 #endif
1523                                 {
1524                                 /* Is this error check actually needed? */
1525                                 al=SSL_AD_HANDSHAKE_FAILURE;
1526                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1527                                 goto f_err;
1528                                 }
1529                         }
1530
1531                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1532                 l2n3(n,d);
1533
1534                 /* we should now have things packed up, so lets send
1535                  * it off */
1536                 s->init_num=n+4;
1537                 s->init_off=0;
1538                 }
1539
1540         s->state = SSL3_ST_SW_KEY_EXCH_B;
1541         EVP_MD_CTX_cleanup(&md_ctx);
1542         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1543 f_err:
1544         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1545 err:
1546 #ifndef OPENSSL_NO_ECDH
1547         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1548         BN_CTX_free(bn_ctx);
1549 #endif
1550         EVP_MD_CTX_cleanup(&md_ctx);
1551         return(-1);
1552         }
1553
1554 int ssl3_send_certificate_request(SSL *s)
1555         {
1556         unsigned char *p,*d;
1557         int i,j,nl,off,n;
1558         STACK_OF(X509_NAME) *sk=NULL;
1559         X509_NAME *name;
1560         BUF_MEM *buf;
1561
1562         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1563                 {
1564                 buf=s->init_buf;
1565
1566                 d=p=(unsigned char *)&(buf->data[4]);
1567
1568                 /* get the list of acceptable cert types */
1569                 p++;
1570                 n=ssl3_get_req_cert_type(s,p);
1571                 d[0]=n;
1572                 p+=n;
1573                 n++;
1574
1575                 off=n;
1576                 p+=2;
1577                 n+=2;
1578
1579                 sk=SSL_get_client_CA_list(s);
1580                 nl=0;
1581                 if (sk != NULL)
1582                         {
1583                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1584                                 {
1585                                 name=sk_X509_NAME_value(sk,i);
1586                                 j=i2d_X509_NAME(name,NULL);
1587                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1588                                         {
1589                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1590                                         goto err;
1591                                         }
1592                                 p=(unsigned char *)&(buf->data[4+n]);
1593                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1594                                         {
1595                                         s2n(j,p);
1596                                         i2d_X509_NAME(name,&p);
1597                                         n+=2+j;
1598                                         nl+=2+j;
1599                                         }
1600                                 else
1601                                         {
1602                                         d=p;
1603                                         i2d_X509_NAME(name,&p);
1604                                         j-=2; s2n(j,d); j+=2;
1605                                         n+=j;
1606                                         nl+=j;
1607                                         }
1608                                 }
1609                         }
1610                 /* else no CA names */
1611                 p=(unsigned char *)&(buf->data[4+off]);
1612                 s2n(nl,p);
1613
1614                 d=(unsigned char *)buf->data;
1615                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1616                 l2n3(n,d);
1617
1618                 /* we should now have things packed up, so lets send
1619                  * it off */
1620
1621                 s->init_num=n+4;
1622                 s->init_off=0;
1623 #ifdef NETSCAPE_HANG_BUG
1624                 p=(unsigned char *)s->init_buf->data + s->init_num;
1625
1626                 /* do the header */
1627                 *(p++)=SSL3_MT_SERVER_DONE;
1628                 *(p++)=0;
1629                 *(p++)=0;
1630                 *(p++)=0;
1631                 s->init_num += 4;
1632 #endif
1633
1634                 s->state = SSL3_ST_SW_CERT_REQ_B;
1635                 }
1636
1637         /* SSL3_ST_SW_CERT_REQ_B */
1638         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1639 err:
1640         return(-1);
1641         }
1642
1643 int ssl3_get_client_key_exchange(SSL *s)
1644         {
1645         int i,al,ok;
1646         long n;
1647         unsigned long l;
1648         unsigned char *p;
1649 #ifndef OPENSSL_NO_RSA
1650         RSA *rsa=NULL;
1651         EVP_PKEY *pkey=NULL;
1652 #endif
1653 #ifndef OPENSSL_NO_DH
1654         BIGNUM *pub=NULL;
1655         DH *dh_srvr;
1656 #endif
1657 #ifndef OPENSSL_NO_KRB5
1658         KSSL_ERR kssl_err;
1659 #endif /* OPENSSL_NO_KRB5 */
1660
1661 #ifndef OPENSSL_NO_ECDH
1662         EC_KEY *srvr_ecdh = NULL;
1663         EVP_PKEY *clnt_pub_pkey = NULL;
1664         EC_POINT *clnt_ecpoint = NULL;
1665         BN_CTX *bn_ctx = NULL; 
1666 #endif
1667
1668         n=s->method->ssl_get_message(s,
1669                 SSL3_ST_SR_KEY_EXCH_A,
1670                 SSL3_ST_SR_KEY_EXCH_B,
1671                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1672                 2048, /* ??? */
1673                 &ok);
1674
1675         if (!ok) return((int)n);
1676         p=(unsigned char *)s->init_msg;
1677
1678         l=s->s3->tmp.new_cipher->algorithms;
1679
1680 #ifndef OPENSSL_NO_RSA
1681         if (l & SSL_kRSA)
1682                 {
1683                 /* FIX THIS UP EAY EAY EAY EAY */
1684                 if (s->s3->tmp.use_rsa_tmp)
1685                         {
1686                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1687                                 rsa=s->cert->rsa_tmp;
1688                         /* Don't do a callback because rsa_tmp should
1689                          * be sent already */
1690                         if (rsa == NULL)
1691                                 {
1692                                 al=SSL_AD_HANDSHAKE_FAILURE;
1693                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1694                                 goto f_err;
1695
1696                                 }
1697                         }
1698                 else
1699                         {
1700                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1701                         if (    (pkey == NULL) ||
1702                                 (pkey->type != EVP_PKEY_RSA) ||
1703                                 (pkey->pkey.rsa == NULL))
1704                                 {
1705                                 al=SSL_AD_HANDSHAKE_FAILURE;
1706                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1707                                 goto f_err;
1708                                 }
1709                         rsa=pkey->pkey.rsa;
1710                         }
1711
1712                 /* TLS */
1713                 if (s->version > SSL3_VERSION)
1714                         {
1715                         n2s(p,i);
1716                         if (n != i+2)
1717                                 {
1718                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1719                                         {
1720                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1721                                         goto err;
1722                                         }
1723                                 else
1724                                         p-=2;
1725                                 }
1726                         else
1727                                 n=i;
1728                         }
1729
1730                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1731
1732                 al = -1;
1733                 
1734                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1735                         {
1736                         al=SSL_AD_DECODE_ERROR;
1737                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1738                         }
1739
1740                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1741                         {
1742                         /* The premaster secret must contain the same version number as the
1743                          * ClientHello to detect version rollback attacks (strangely, the
1744                          * protocol does not offer such protection for DH ciphersuites).
1745                          * However, buggy clients exist that send the negotiated protocol
1746                          * version instead if the server does not support the requested
1747                          * protocol version.
1748                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1749                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1750                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1751                                 {
1752                                 al=SSL_AD_DECODE_ERROR;
1753                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1754
1755                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1756                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1757                                  * number check as a "bad version oracle" -- an alert would
1758                                  * reveal that the plaintext corresponding to some ciphertext
1759                                  * made up by the adversary is properly formatted except
1760                                  * that the version number is wrong.  To avoid such attacks,
1761                                  * we should treat this just like any other decryption error. */
1762                                 }
1763                         }
1764
1765                 if (al != -1)
1766                         {
1767                         /* Some decryption failure -- use random value instead as countermeasure
1768                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1769                          * (see RFC 2246, section 7.4.7.1). */
1770                         ERR_clear_error();
1771                         i = SSL_MAX_MASTER_KEY_LENGTH;
1772                         p[0] = s->client_version >> 8;
1773                         p[1] = s->client_version & 0xff;
1774                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1775                                 goto err;
1776                         }
1777         
1778                 s->session->master_key_length=
1779                         s->method->ssl3_enc->generate_master_secret(s,
1780                                 s->session->master_key,
1781                                 p,i);
1782                 OPENSSL_cleanse(p,i);
1783                 }
1784         else
1785 #endif
1786 #ifndef OPENSSL_NO_DH
1787                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1788                 {
1789                 n2s(p,i);
1790                 if (n != i+2)
1791                         {
1792                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1793                                 {
1794                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1795                                 goto err;
1796                                 }
1797                         else
1798                                 {
1799                                 p-=2;
1800                                 i=(int)n;
1801                                 }
1802                         }
1803
1804                 if (n == 0L) /* the parameters are in the cert */
1805                         {
1806                         al=SSL_AD_HANDSHAKE_FAILURE;
1807                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1808                         goto f_err;
1809                         }
1810                 else
1811                         {
1812                         if (s->s3->tmp.dh == NULL)
1813                                 {
1814                                 al=SSL_AD_HANDSHAKE_FAILURE;
1815                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1816                                 goto f_err;
1817                                 }
1818                         else
1819                                 dh_srvr=s->s3->tmp.dh;
1820                         }
1821
1822                 pub=BN_bin2bn(p,i,NULL);
1823                 if (pub == NULL)
1824                         {
1825                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1826                         goto err;
1827                         }
1828
1829                 i=DH_compute_key(p,pub,dh_srvr);
1830
1831                 if (i <= 0)
1832                         {
1833                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1834                         goto err;
1835                         }
1836
1837                 DH_free(s->s3->tmp.dh);
1838                 s->s3->tmp.dh=NULL;
1839
1840                 BN_clear_free(pub);
1841                 pub=NULL;
1842                 s->session->master_key_length=
1843                         s->method->ssl3_enc->generate_master_secret(s,
1844                                 s->session->master_key,p,i);
1845                 OPENSSL_cleanse(p,i);
1846                 }
1847         else
1848 #endif
1849 #ifndef OPENSSL_NO_KRB5
1850         if (l & SSL_kKRB5)
1851                 {
1852                 krb5_error_code         krb5rc;
1853                 krb5_data               enc_ticket;
1854                 krb5_data               authenticator;
1855                 krb5_data               enc_pms;
1856                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1857                 EVP_CIPHER_CTX          ciph_ctx;
1858                 EVP_CIPHER              *enc = NULL;
1859                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1860                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1861                                                + EVP_MAX_BLOCK_LENGTH];
1862                 int                     padl, outl;
1863                 krb5_timestamp          authtime = 0;
1864                 krb5_ticket_times       ttimes;
1865
1866                 EVP_CIPHER_CTX_init(&ciph_ctx);
1867
1868                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1869
1870                 n2s(p,i);
1871                 enc_ticket.length = i;
1872
1873                 if (n < (int)enc_ticket.length + 6)
1874                         {
1875                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1876                                 SSL_R_DATA_LENGTH_TOO_LONG);
1877                         goto err;
1878                         }
1879
1880                 enc_ticket.data = (char *)p;
1881                 p+=enc_ticket.length;
1882
1883                 n2s(p,i);
1884                 authenticator.length = i;
1885
1886                 if (n < (int)(enc_ticket.length + authenticator.length) + 6)
1887                         {
1888                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1889                                 SSL_R_DATA_LENGTH_TOO_LONG);
1890                         goto err;
1891                         }
1892
1893                 authenticator.data = (char *)p;
1894                 p+=authenticator.length;
1895
1896                 n2s(p,i);
1897                 enc_pms.length = i;
1898                 enc_pms.data = (char *)p;
1899                 p+=enc_pms.length;
1900
1901                 /* Note that the length is checked again below,
1902                 ** after decryption
1903                 */
1904                 if(enc_pms.length > sizeof pms)
1905                         {
1906                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1907                                SSL_R_DATA_LENGTH_TOO_LONG);
1908                         goto err;
1909                         }
1910
1911                 if (n != (long)(enc_ticket.length + authenticator.length +
1912                                                 enc_pms.length + 6))
1913                         {
1914                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1915                                 SSL_R_DATA_LENGTH_TOO_LONG);
1916                         goto err;
1917                         }
1918
1919                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1920                                         &kssl_err)) != 0)
1921                         {
1922 #ifdef KSSL_DEBUG
1923                         printf("kssl_sget_tkt rtn %d [%d]\n",
1924                                 krb5rc, kssl_err.reason);
1925                         if (kssl_err.text)
1926                                 printf("kssl_err text= %s\n", kssl_err.text);
1927 #endif  /* KSSL_DEBUG */
1928                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1929                                 kssl_err.reason);
1930                         goto err;
1931                         }
1932
1933                 /*  Note: no authenticator is not considered an error,
1934                 **  but will return authtime == 0.
1935                 */
1936                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1937                                         &authtime, &kssl_err)) != 0)
1938                         {
1939 #ifdef KSSL_DEBUG
1940                         printf("kssl_check_authent rtn %d [%d]\n",
1941                                 krb5rc, kssl_err.reason);
1942                         if (kssl_err.text)
1943                                 printf("kssl_err text= %s\n", kssl_err.text);
1944 #endif  /* KSSL_DEBUG */
1945                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1946                                 kssl_err.reason);
1947                         goto err;
1948                         }
1949
1950                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1951                         {
1952                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
1953                         goto err;
1954                         }
1955
1956 #ifdef KSSL_DEBUG
1957                 kssl_ctx_show(kssl_ctx);
1958 #endif  /* KSSL_DEBUG */
1959
1960                 enc = kssl_map_enc(kssl_ctx->enctype);
1961                 if (enc == NULL)
1962                     goto err;
1963
1964                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
1965
1966                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
1967                         {
1968                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1969                                 SSL_R_DECRYPTION_FAILED);
1970                         goto err;
1971                         }
1972                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1973                                         (unsigned char *)enc_pms.data, enc_pms.length))
1974                         {
1975                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1976                                 SSL_R_DECRYPTION_FAILED);
1977                         goto err;
1978                         }
1979                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1980                         {
1981                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1982                                 SSL_R_DATA_LENGTH_TOO_LONG);
1983                         goto err;
1984                         }
1985                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
1986                         {
1987                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1988                                 SSL_R_DECRYPTION_FAILED);
1989                         goto err;
1990                         }
1991                 outl += padl;
1992                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1993                         {
1994                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1995                                 SSL_R_DATA_LENGTH_TOO_LONG);
1996                         goto err;
1997                         }
1998                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1999
2000                 s->session->master_key_length=
2001                         s->method->ssl3_enc->generate_master_secret(s,
2002                                 s->session->master_key, pms, outl);
2003
2004                 if (kssl_ctx->client_princ)
2005                         {
2006                         size_t len = strlen(kssl_ctx->client_princ);
2007                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2008                                 {
2009                                 s->session->krb5_client_princ_len = len;
2010                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2011                                 }
2012                         }
2013
2014
2015                 /*  Was doing kssl_ctx_free() here,
2016                 **  but it caused problems for apache.
2017                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2018                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2019                 */
2020                 }
2021         else
2022 #endif  /* OPENSSL_NO_KRB5 */
2023
2024 #ifndef OPENSSL_NO_ECDH
2025                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2026                 {
2027                 int ret = 1;
2028                 int field_size = 0;
2029                 const EC_KEY   *tkey;
2030                 const EC_GROUP *group;
2031                 const BIGNUM *priv_key;
2032
2033                 /* initialize structures for server's ECDH key pair */
2034                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2035                         {
2036                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2037                             ERR_R_MALLOC_FAILURE);
2038                         goto err;
2039                         }
2040
2041                 /* Let's get server private key and group information */
2042                 if (l & SSL_kECDH) 
2043                         { 
2044                         /* use the certificate */
2045                         tkey = s->cert->key->privatekey->pkey.ec;
2046                         }
2047                 else
2048                         {
2049                         /* use the ephermeral values we saved when
2050                          * generating the ServerKeyExchange msg.
2051                          */
2052                         tkey = s->s3->tmp.ecdh;
2053                         }
2054
2055                 group    = EC_KEY_get0_group(tkey);
2056                 priv_key = EC_KEY_get0_private_key(tkey);
2057
2058                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2059                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2060                         {
2061                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2062                                ERR_R_EC_LIB);
2063                         goto err;
2064                         }
2065
2066                 /* Let's get client's public key */
2067                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2068                         {
2069                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2070                             ERR_R_MALLOC_FAILURE);
2071                         goto err;
2072                         }
2073
2074                 if (n == 0L) 
2075                         {
2076                         /* Client Publickey was in Client Certificate */
2077
2078                          if (l & SSL_kECDHE) 
2079                                  {
2080                                  al=SSL_AD_HANDSHAKE_FAILURE;
2081                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2082                                  goto f_err;
2083                                  }
2084                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2085                             == NULL) || 
2086                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2087                                 {
2088                                 /* XXX: For now, we do not support client
2089                                  * authentication using ECDH certificates
2090                                  * so this branch (n == 0L) of the code is
2091                                  * never executed. When that support is
2092                                  * added, we ought to ensure the key 
2093                                  * received in the certificate is 
2094                                  * authorized for key agreement.
2095                                  * ECDH_compute_key implicitly checks that
2096                                  * the two ECDH shares are for the same
2097                                  * group.
2098                                  */
2099                                 al=SSL_AD_HANDSHAKE_FAILURE;
2100                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2101                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2102                                 goto f_err;
2103                                 }
2104
2105                         if (EC_POINT_copy(clnt_ecpoint,
2106                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2107                                 {
2108                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2109                                         ERR_R_EC_LIB);
2110                                 goto err;
2111                                 }
2112                         ret = 2; /* Skip certificate verify processing */
2113                         }
2114                 else
2115                         {
2116                         /* Get client's public key from encoded point
2117                          * in the ClientKeyExchange message.
2118                          */
2119                         if ((bn_ctx = BN_CTX_new()) == NULL)
2120                                 {
2121                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2122                                     ERR_R_MALLOC_FAILURE);
2123                                 goto err;
2124                                 }
2125
2126                         /* Get encoded point length */
2127                         i = *p; 
2128                         p += 1;
2129                         if (EC_POINT_oct2point(group, 
2130                             clnt_ecpoint, p, i, bn_ctx) == 0)
2131                                 {
2132                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2133                                     ERR_R_EC_LIB);
2134                                 goto err;
2135                                 }
2136                         /* p is pointing to somewhere in the buffer
2137                          * currently, so set it to the start 
2138                          */ 
2139                         p=(unsigned char *)s->init_buf->data;
2140                         }
2141
2142                 /* Compute the shared pre-master secret */
2143                 field_size = EC_GROUP_get_degree(group);
2144                 if (field_size <= 0)
2145                         {
2146                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2147                                ERR_R_ECDH_LIB);
2148                         goto err;
2149                         }
2150                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2151                 if (i <= 0)
2152                         {
2153                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2154                             ERR_R_ECDH_LIB);
2155                         goto err;
2156                         }
2157
2158                 EVP_PKEY_free(clnt_pub_pkey);
2159                 EC_POINT_free(clnt_ecpoint);
2160                 if (srvr_ecdh != NULL) 
2161                         EC_KEY_free(srvr_ecdh);
2162                 BN_CTX_free(bn_ctx);
2163
2164                 /* Compute the master secret */
2165                 s->session->master_key_length = s->method->ssl3_enc-> \
2166                     generate_master_secret(s, s->session->master_key, p, i);
2167                 
2168                 OPENSSL_cleanse(p, i);
2169                 return (ret);
2170                 }
2171         else
2172 #endif
2173                 {
2174                 al=SSL_AD_HANDSHAKE_FAILURE;
2175                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2176                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2177                 goto f_err;
2178                 }
2179
2180         return(1);
2181 f_err:
2182         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2183 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2184 err:
2185 #endif
2186 #ifndef OPENSSL_NO_ECDH
2187         EVP_PKEY_free(clnt_pub_pkey);
2188         EC_POINT_free(clnt_ecpoint);
2189         if (srvr_ecdh != NULL) 
2190                 EC_KEY_free(srvr_ecdh);
2191         BN_CTX_free(bn_ctx);
2192 #endif
2193         return(-1);
2194         }
2195
2196 int ssl3_get_cert_verify(SSL *s)
2197         {
2198         EVP_PKEY *pkey=NULL;
2199         unsigned char *p;
2200         int al,ok,ret=0;
2201         long n;
2202         int type=0,i,j;
2203         X509 *peer;
2204
2205         n=s->method->ssl_get_message(s,
2206                 SSL3_ST_SR_CERT_VRFY_A,
2207                 SSL3_ST_SR_CERT_VRFY_B,
2208                 -1,
2209                 514, /* 514? */
2210                 &ok);
2211
2212         if (!ok) return((int)n);
2213
2214         if (s->session->peer != NULL)
2215                 {
2216                 peer=s->session->peer;
2217                 pkey=X509_get_pubkey(peer);
2218                 type=X509_certificate_type(peer,pkey);
2219                 }
2220         else
2221                 {
2222                 peer=NULL;
2223                 pkey=NULL;
2224                 }
2225
2226         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2227                 {
2228                 s->s3->tmp.reuse_message=1;
2229                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2230                         {
2231                         al=SSL_AD_UNEXPECTED_MESSAGE;
2232                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2233                         goto f_err;
2234                         }
2235                 ret=1;
2236                 goto end;
2237                 }
2238
2239         if (peer == NULL)
2240                 {
2241                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2242                 al=SSL_AD_UNEXPECTED_MESSAGE;
2243                 goto f_err;
2244                 }
2245
2246         if (!(type & EVP_PKT_SIGN))
2247                 {
2248                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2249                 al=SSL_AD_ILLEGAL_PARAMETER;
2250                 goto f_err;
2251                 }
2252
2253         if (s->s3->change_cipher_spec)
2254                 {
2255                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2256                 al=SSL_AD_UNEXPECTED_MESSAGE;
2257                 goto f_err;
2258                 }
2259
2260         /* we now have a signature that we need to verify */
2261         p=(unsigned char *)s->init_msg;
2262         n2s(p,i);
2263         n-=2;
2264         if (i > n)
2265                 {
2266                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2267                 al=SSL_AD_DECODE_ERROR;
2268                 goto f_err;
2269                 }
2270
2271         j=EVP_PKEY_size(pkey);
2272         if ((i > j) || (n > j) || (n <= 0))
2273                 {
2274                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2275                 al=SSL_AD_DECODE_ERROR;
2276                 goto f_err;
2277                 }
2278
2279 #ifndef OPENSSL_NO_RSA 
2280         if (pkey->type == EVP_PKEY_RSA)
2281                 {
2282                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2283                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
2284                                                         pkey->pkey.rsa);
2285                 if (i < 0)
2286                         {
2287                         al=SSL_AD_DECRYPT_ERROR;
2288                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2289                         goto f_err;
2290                         }
2291                 if (i == 0)
2292                         {
2293                         al=SSL_AD_DECRYPT_ERROR;
2294                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2295                         goto f_err;
2296                         }
2297                 }
2298         else
2299 #endif
2300 #ifndef OPENSSL_NO_DSA
2301                 if (pkey->type == EVP_PKEY_DSA)
2302                 {
2303                 j=DSA_verify(pkey->save_type,
2304                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2305                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2306                 if (j <= 0)
2307                         {
2308                         /* bad signature */
2309                         al=SSL_AD_DECRYPT_ERROR;
2310                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2311                         goto f_err;
2312                         }
2313                 }
2314         else
2315 #endif
2316 #ifndef OPENSSL_NO_ECDSA
2317                 if (pkey->type == EVP_PKEY_EC)
2318                 {
2319                 j=ECDSA_verify(pkey->save_type,
2320                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2321                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2322                 if (j <= 0)
2323                         {
2324                         /* bad signature */
2325                         al=SSL_AD_DECRYPT_ERROR;
2326                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2327                             SSL_R_BAD_ECDSA_SIGNATURE);
2328                         goto f_err;
2329                         }
2330                 }
2331         else
2332 #endif
2333                 {
2334                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2335                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2336                 goto f_err;
2337                 }
2338
2339
2340         ret=1;
2341         if (0)
2342                 {
2343 f_err:
2344                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2345                 }
2346 end:
2347         EVP_PKEY_free(pkey);
2348         return(ret);
2349         }
2350
2351 int ssl3_get_client_certificate(SSL *s)
2352         {
2353         int i,ok,al,ret= -1;
2354         X509 *x=NULL;
2355         unsigned long l,nc,llen,n;
2356         const unsigned char *p,*q;
2357         unsigned char *d;
2358         STACK_OF(X509) *sk=NULL;
2359
2360         n=s->method->ssl_get_message(s,
2361                 SSL3_ST_SR_CERT_A,
2362                 SSL3_ST_SR_CERT_B,
2363                 -1,
2364                 s->max_cert_list,
2365                 &ok);
2366
2367         if (!ok) return((int)n);
2368
2369         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2370                 {
2371                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2372                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2373                         {
2374                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2375                         al=SSL_AD_HANDSHAKE_FAILURE;
2376                         goto f_err;
2377                         }
2378                 /* If tls asked for a client cert, the client must return a 0 list */
2379                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2380                         {
2381                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2382                         al=SSL_AD_UNEXPECTED_MESSAGE;
2383                         goto f_err;
2384                         }
2385                 s->s3->tmp.reuse_message=1;
2386                 return(1);
2387                 }
2388
2389         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2390                 {
2391                 al=SSL_AD_UNEXPECTED_MESSAGE;
2392                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2393                 goto f_err;
2394                 }
2395         p=d=(unsigned char *)s->init_msg;
2396
2397         if ((sk=sk_X509_new_null()) == NULL)
2398                 {
2399                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2400                 goto err;
2401                 }
2402
2403         n2l3(p,llen);
2404         if (llen+3 != n)
2405                 {
2406                 al=SSL_AD_DECODE_ERROR;
2407                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2408                 goto f_err;
2409                 }
2410         for (nc=0; nc<llen; )
2411                 {
2412                 n2l3(p,l);
2413                 if ((l+nc+3) > llen)
2414                         {
2415                         al=SSL_AD_DECODE_ERROR;
2416                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2417                         goto f_err;
2418                         }
2419
2420                 q=p;
2421                 x=d2i_X509(NULL,&p,l);
2422                 if (x == NULL)
2423                         {
2424                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2425                         goto err;
2426                         }
2427                 if (p != (q+l))
2428                         {
2429                         al=SSL_AD_DECODE_ERROR;
2430                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2431                         goto f_err;
2432                         }
2433                 if (!sk_X509_push(sk,x))
2434                         {
2435                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2436                         goto err;
2437                         }
2438                 x=NULL;
2439                 nc+=l+3;
2440                 }
2441
2442         if (sk_X509_num(sk) <= 0)
2443                 {
2444                 /* TLS does not mind 0 certs returned */
2445                 if (s->version == SSL3_VERSION)
2446                         {
2447                         al=SSL_AD_HANDSHAKE_FAILURE;
2448                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2449                         goto f_err;
2450                         }
2451                 /* Fail for TLS only if we required a certificate */
2452                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2453                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2454                         {
2455                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2456                         al=SSL_AD_HANDSHAKE_FAILURE;
2457                         goto f_err;
2458                         }
2459                 }
2460         else
2461                 {
2462                 i=ssl_verify_cert_chain(s,sk);
2463                 if (!i)
2464                         {
2465                         al=ssl_verify_alarm_type(s->verify_result);
2466                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2467                         goto f_err;
2468                         }
2469                 }
2470
2471         if (s->session->peer != NULL) /* This should not be needed */
2472                 X509_free(s->session->peer);
2473         s->session->peer=sk_X509_shift(sk);
2474         s->session->verify_result = s->verify_result;
2475
2476         /* With the current implementation, sess_cert will always be NULL
2477          * when we arrive here. */
2478         if (s->session->sess_cert == NULL)
2479                 {
2480                 s->session->sess_cert = ssl_sess_cert_new();
2481                 if (s->session->sess_cert == NULL)
2482                         {
2483                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2484                         goto err;
2485                         }
2486                 }
2487         if (s->session->sess_cert->cert_chain != NULL)
2488                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2489         s->session->sess_cert->cert_chain=sk;
2490         /* Inconsistency alert: cert_chain does *not* include the
2491          * peer's own certificate, while we do include it in s3_clnt.c */
2492
2493         sk=NULL;
2494
2495         ret=1;
2496         if (0)
2497                 {
2498 f_err:
2499                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2500                 }
2501 err:
2502         if (x != NULL) X509_free(x);
2503         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2504         return(ret);
2505         }
2506
2507 int ssl3_send_server_certificate(SSL *s)
2508         {
2509         unsigned long l;
2510         X509 *x;
2511
2512         if (s->state == SSL3_ST_SW_CERT_A)
2513                 {
2514                 x=ssl_get_server_send_cert(s);
2515                 if (x == NULL &&
2516                         /* VRS: allow null cert if auth == KRB5 */
2517                         (s->s3->tmp.new_cipher->algorithms
2518                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2519                         != (SSL_aKRB5|SSL_kKRB5))
2520                         {
2521                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2522                         return(0);
2523                         }
2524
2525                 l=ssl3_output_cert_chain(s,x);
2526                 s->state=SSL3_ST_SW_CERT_B;
2527                 s->init_num=(int)l;
2528                 s->init_off=0;
2529                 }
2530
2531         /* SSL3_ST_SW_CERT_B */
2532         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2533         }
2534
2535
2536 #ifndef OPENSSL_NO_ECDH
2537 /* This is the complement of curve_id2nid in s3_clnt.c. */
2538 static int nid2curve_id(int nid)
2539 {
2540         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2541          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2542         switch (nid) {
2543         case NID_sect163k1: /* sect163k1 (1) */
2544                 return 1;
2545         case NID_sect163r1: /* sect163r1 (2) */
2546                 return 2;
2547         case NID_sect163r2: /* sect163r2 (3) */
2548                 return 3;
2549         case NID_sect193r1: /* sect193r1 (4) */ 
2550                 return 4;
2551         case NID_sect193r2: /* sect193r2 (5) */ 
2552                 return 5;
2553         case NID_sect233k1: /* sect233k1 (6) */
2554                 return 6;
2555         case NID_sect233r1: /* sect233r1 (7) */ 
2556                 return 7;
2557         case NID_sect239k1: /* sect239k1 (8) */ 
2558                 return 8;
2559         case NID_sect283k1: /* sect283k1 (9) */
2560                 return 9;
2561         case NID_sect283r1: /* sect283r1 (10) */ 
2562                 return 10;
2563         case NID_sect409k1: /* sect409k1 (11) */ 
2564                 return 11;
2565         case NID_sect409r1: /* sect409r1 (12) */
2566                 return 12;
2567         case NID_sect571k1: /* sect571k1 (13) */ 
2568                 return 13;
2569         case NID_sect571r1: /* sect571r1 (14) */ 
2570                 return 14;
2571         case NID_secp160k1: /* secp160k1 (15) */
2572                 return 15;
2573         case NID_secp160r1: /* secp160r1 (16) */ 
2574                 return 16;
2575         case NID_secp160r2: /* secp160r2 (17) */ 
2576                 return 17;
2577         case NID_secp192k1: /* secp192k1 (18) */
2578                 return 18;
2579         case NID_X9_62_prime192v1: /* secp192r1 (19) */ 
2580                 return 19;
2581         case NID_secp224k1: /* secp224k1 (20) */ 
2582                 return 20;
2583         case NID_secp224r1: /* secp224r1 (21) */
2584                 return 21;
2585         case NID_secp256k1: /* secp256k1 (22) */ 
2586                 return 22;
2587         case NID_X9_62_prime256v1: /* secp256r1 (23) */ 
2588                 return 23;
2589         case NID_secp384r1: /* secp384r1 (24) */
2590                 return 24;
2591         case NID_secp521r1:  /* secp521r1 (25) */       
2592                 return 25;
2593         default:
2594                 return 0;
2595         }
2596 }
2597 #endif