Don't use the SSL 2.0 Client Hello format if SSL 2.0 is disabled
[openssl.git] / ssl / s2_srvr.c
1 /* ssl/s2_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) 1998-2001 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 #include "ssl_locl.h"
113 #ifndef OPENSSL_NO_SSL2
114 #include <stdio.h>
115 #include <openssl/bio.h>
116 #include <openssl/rand.h>
117 #include <openssl/objects.h>
118 #include <openssl/evp.h>
119
120 static SSL_METHOD *ssl2_get_server_method(int ver);
121 static int get_client_master_key(SSL *s);
122 static int get_client_hello(SSL *s);
123 static int server_hello(SSL *s); 
124 static int get_client_finished(SSL *s);
125 static int server_verify(SSL *s);
126 static int server_finish(SSL *s);
127 static int request_certificate(SSL *s);
128 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
129         unsigned char *to,int padding);
130 #define BREAK   break
131
132 static SSL_METHOD *ssl2_get_server_method(int ver)
133         {
134         if (ver == SSL2_VERSION)
135                 return(SSLv2_server_method());
136         else
137                 return(NULL);
138         }
139
140 SSL_METHOD *SSLv2_server_method(void)
141         {
142         static int init=1;
143         static SSL_METHOD SSLv2_server_data;
144
145         if (init)
146                 {
147                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
148
149                 if (init)
150                         {
151                         memcpy((char *)&SSLv2_server_data,(char *)sslv2_base_method(),
152                                 sizeof(SSL_METHOD));
153                         SSLv2_server_data.ssl_accept=ssl2_accept;
154                         SSLv2_server_data.get_ssl_method=ssl2_get_server_method;
155                         init=0;
156                         }
157
158                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
159                 }
160         return(&SSLv2_server_data);
161         }
162
163 int ssl2_accept(SSL *s)
164         {
165         unsigned long l=time(NULL);
166         BUF_MEM *buf=NULL;
167         int ret= -1;
168         long num1;
169         void (*cb)(const SSL *ssl,int type,int val)=NULL;
170         int new_state,state;
171
172         RAND_add(&l,sizeof(l),0);
173         ERR_clear_error();
174         clear_sys_error();
175
176         if (s->info_callback != NULL)
177                 cb=s->info_callback;
178         else if (s->ctx->info_callback != NULL)
179                 cb=s->ctx->info_callback;
180
181         /* init things to blank */
182         s->in_handshake++;
183         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
184
185         if (s->cert == NULL)
186                 {
187                 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
188                 return(-1);
189                 }
190
191         clear_sys_error();
192         for (;;)
193                 {
194                 state=s->state;
195
196                 switch (s->state)
197                         {
198                 case SSL_ST_BEFORE:
199                 case SSL_ST_ACCEPT:
200                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
201                 case SSL_ST_OK|SSL_ST_ACCEPT:
202
203                         s->server=1;
204                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
205
206                         s->version=SSL2_VERSION;
207                         s->type=SSL_ST_ACCEPT;
208
209                         buf=s->init_buf;
210                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
211                                 { ret= -1; goto end; }
212                         if (!BUF_MEM_grow(buf,(int)
213                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
214                                 { ret= -1; goto end; }
215                         s->init_buf=buf;
216                         s->init_num=0;
217                         s->ctx->stats.sess_accept++;
218                         s->handshake_func=ssl2_accept;
219                         s->state=SSL2_ST_GET_CLIENT_HELLO_A;
220                         BREAK;
221
222                 case SSL2_ST_GET_CLIENT_HELLO_A:
223                 case SSL2_ST_GET_CLIENT_HELLO_B:
224                 case SSL2_ST_GET_CLIENT_HELLO_C:
225                         s->shutdown=0;
226                         ret=get_client_hello(s);
227                         if (ret <= 0) goto end;
228                         s->init_num=0;
229                         s->state=SSL2_ST_SEND_SERVER_HELLO_A;
230                         BREAK;
231
232                 case SSL2_ST_SEND_SERVER_HELLO_A:
233                 case SSL2_ST_SEND_SERVER_HELLO_B:
234                         ret=server_hello(s);
235                         if (ret <= 0) goto end;
236                         s->init_num=0;
237                         if (!s->hit)
238                                 {
239                                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
240                                 BREAK;
241                                 }
242                         else
243                                 {
244                                 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
245                                 BREAK;
246                                 }
247                 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
248                 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
249                         ret=get_client_master_key(s);
250                         if (ret <= 0) goto end;
251                         s->init_num=0;
252                         s->state=SSL2_ST_SERVER_START_ENCRYPTION;
253                         BREAK;
254
255                 case SSL2_ST_SERVER_START_ENCRYPTION:
256                         /* Ok we how have sent all the stuff needed to
257                          * start encrypting, the next packet back will
258                          * be encrypted. */
259                         if (!ssl2_enc_init(s,0))
260                                 { ret= -1; goto end; }
261                         s->s2->clear_text=0;
262                         s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
263                         BREAK;
264
265                 case SSL2_ST_SEND_SERVER_VERIFY_A:
266                 case SSL2_ST_SEND_SERVER_VERIFY_B:
267                         ret=server_verify(s);
268                         if (ret <= 0) goto end;
269                         s->init_num=0;
270                         if (s->hit)
271                                 {
272                                 /* If we are in here, we have been
273                                  * buffering the output, so we need to
274                                  * flush it and remove buffering from
275                                  * future traffic */
276                                 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
277                                 BREAK;
278                                 }
279                         else
280                                 {
281                                 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
282                                 break;
283                                 }
284
285                 case SSL2_ST_SEND_SERVER_VERIFY_C:
286                         /* get the number of bytes to write */
287                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
288                         if (num1 != 0)
289                                 {
290                                 s->rwstate=SSL_WRITING;
291                                 num1=BIO_flush(s->wbio);
292                                 if (num1 <= 0) { ret= -1; goto end; }
293                                 s->rwstate=SSL_NOTHING;
294                                 }
295
296                         /* flushed and now remove buffering */
297                         s->wbio=BIO_pop(s->wbio);
298
299                         s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
300                         BREAK;
301
302                 case SSL2_ST_GET_CLIENT_FINISHED_A:
303                 case SSL2_ST_GET_CLIENT_FINISHED_B:
304                         ret=get_client_finished(s);
305                         if (ret <= 0)
306                                 goto end;
307                         s->init_num=0;
308                         s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
309                         BREAK;
310
311                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
312                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
313                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
314                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
315                         /* don't do a 'request certificate' if we
316                          * don't want to, or we already have one, and
317                          * we only want to do it once. */
318                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
319                                 ((s->session->peer != NULL) &&
320                                 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
321                                 {
322                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
323                                 break;
324                                 }
325                         else
326                                 {
327                                 ret=request_certificate(s);
328                                 if (ret <= 0) goto end;
329                                 s->init_num=0;
330                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
331                                 }
332                         BREAK;
333
334                 case SSL2_ST_SEND_SERVER_FINISHED_A:
335                 case SSL2_ST_SEND_SERVER_FINISHED_B:
336                         ret=server_finish(s);
337                         if (ret <= 0) goto end;
338                         s->init_num=0;
339                         s->state=SSL_ST_OK;
340                         break;
341
342                 case SSL_ST_OK:
343                         BUF_MEM_free(s->init_buf);
344                         ssl_free_wbio_buffer(s);
345                         s->init_buf=NULL;
346                         s->init_num=0;
347                 /*      ERR_clear_error();*/
348
349                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
350
351                         s->ctx->stats.sess_accept_good++;
352                         /* s->server=1; */
353                         ret=1;
354
355                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
356
357                         goto end;
358                         /* BREAK; */
359
360                 default:
361                         SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
362                         ret= -1;
363                         goto end;
364                         /* BREAK; */
365                         }
366                 
367                 if ((cb != NULL) && (s->state != state))
368                         {
369                         new_state=s->state;
370                         s->state=state;
371                         cb(s,SSL_CB_ACCEPT_LOOP,1);
372                         s->state=new_state;
373                         }
374                 }
375 end:
376         s->in_handshake--;
377         if (cb != NULL)
378                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
379         return(ret);
380         }
381
382 static int get_client_master_key(SSL *s)
383         {
384         int is_export,i,n,keya,ek;
385         unsigned long len;
386         unsigned char *p;
387         SSL_CIPHER *cp;
388         const EVP_CIPHER *c;
389         const EVP_MD *md;
390
391         p=(unsigned char *)s->init_buf->data;
392         if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
393                 {
394                 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
395
396                 if (i < (10-s->init_num))
397                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
398                 s->init_num = 10;
399
400                 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
401                         {
402                         if (p[-1] != SSL2_MT_ERROR)
403                                 {
404                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
405                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
406                                 }
407                         else
408                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
409                         return(-1);
410                         }
411
412                 cp=ssl2_get_cipher_by_char(p);
413                 if (cp == NULL)
414                         {
415                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
416                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
417                         return(-1);
418                         }
419                 s->session->cipher= cp;
420
421                 p+=3;
422                 n2s(p,i); s->s2->tmp.clear=i;
423                 n2s(p,i); s->s2->tmp.enc=i;
424                 n2s(p,i); s->session->key_arg_length=i;
425                 if(s->session->key_arg_length > SSL_MAX_KEY_ARG_LENGTH)
426                         {
427                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
428                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
429                         return -1;
430                         }
431                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
432                 }
433
434         /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
435         p=(unsigned char *)s->init_buf->data;
436         if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
437                 {
438                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
439                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
440                 return -1;
441                 }
442         keya=s->session->key_arg_length;
443         len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + (unsigned long)keya;
444         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
445                 {
446                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
447                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG);
448                 return -1;
449                 }
450         n = (int)len - s->init_num;
451         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
452         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
453         if (s->msg_callback)
454                 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */
455         p += 10;
456
457         memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
458                 (unsigned int)keya);
459
460         if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
461                 {
462                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
463                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
464                 return(-1);
465                 }
466         i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
467                 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
468                 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
469
470         is_export=SSL_C_IS_EXPORT(s->session->cipher);
471         
472         if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
473                 {
474                 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
475                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
476                 return(0);
477                 }
478
479         if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
480                 {
481                 is_export=1;
482                 ek=8;
483                 }
484         else
485                 ek=5;
486
487         /* bad decrypt */
488 #if 1
489         /* If a bad decrypt, continue with protocol but with a
490          * random master secret (Bleichenbacher attack) */
491         if ((i < 0) ||
492                 ((!is_export && (i != EVP_CIPHER_key_length(c)))
493                 || (is_export && ((i != ek) || (s->s2->tmp.clear+(unsigned int)i !=
494                         (unsigned int)EVP_CIPHER_key_length(c))))))
495                 {
496                 ERR_clear_error();
497                 if (is_export)
498                         i=ek;
499                 else
500                         i=EVP_CIPHER_key_length(c);
501                 if (RAND_pseudo_bytes(p,i) <= 0)
502                         return 0;
503                 }
504 #else
505         if (i < 0)
506                 {
507                 error=1;
508                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
509                 }
510         /* incorrect number of key bytes for non export cipher */
511         else if ((!is_export && (i != EVP_CIPHER_key_length(c)))
512                 || (is_export && ((i != ek) || (s->s2->tmp.clear+i !=
513                         EVP_CIPHER_key_length(c)))))
514                 {
515                 error=1;
516                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
517                 }
518         if (error)
519                 {
520                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
521                 return(-1);
522                 }
523 #endif
524
525         if (is_export) i+=s->s2->tmp.clear;
526
527         if (i > SSL_MAX_MASTER_KEY_LENGTH)
528                 {
529                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
530                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
531                 return -1;
532                 }
533         s->session->master_key_length=i;
534         memcpy(s->session->master_key,p,(unsigned int)i);
535         return(1);
536         }
537
538 static int get_client_hello(SSL *s)
539         {
540         int i,n;
541         unsigned long len;
542         unsigned char *p;
543         STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
544         STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
545         STACK_OF(SSL_CIPHER) *prio, *allow;
546         int z;
547
548         /* This is a bit of a hack to check for the correct packet
549          * type the first time round. */
550         if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
551                 {
552                 s->first_packet=1;
553                 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
554                 }
555
556         p=(unsigned char *)s->init_buf->data;
557         if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
558                 {
559                 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
560                 if (i < (9-s->init_num)) 
561                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
562                 s->init_num = 9;
563         
564                 if (*(p++) != SSL2_MT_CLIENT_HELLO)
565                         {
566                         if (p[-1] != SSL2_MT_ERROR)
567                                 {
568                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
569                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
570                                 }
571                         else
572                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
573                         return(-1);
574                         }
575                 n2s(p,i);
576                 if (i < s->version) s->version=i;
577                 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
578                 n2s(p,i); s->s2->tmp.session_id_length=i;
579                 n2s(p,i); s->s2->challenge_length=i;
580                 if (    (i < SSL2_MIN_CHALLENGE_LENGTH) ||
581                         (i > SSL2_MAX_CHALLENGE_LENGTH))
582                         {
583                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
584                         SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
585                         return(-1);
586                         }
587                 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
588                 }
589
590         /* SSL2_ST_GET_CLIENT_HELLO_C */
591         p=(unsigned char *)s->init_buf->data;
592         len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length;
593         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
594                 {
595                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
596                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG);
597                 return -1;
598                 }
599         n = (int)len - s->init_num;
600         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
601         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
602         if (s->msg_callback)
603                 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */
604         p += 9;
605
606         /* get session-id before cipher stuff so we can get out session
607          * structure if it is cached */
608         /* session-id */
609         if ((s->s2->tmp.session_id_length != 0) && 
610                 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
611                 {
612                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
613                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
614                 return(-1);
615                 }
616
617         if (s->s2->tmp.session_id_length == 0)
618                 {
619                 if (!ssl_get_new_session(s,1))
620                         {
621                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
622                         return(-1);
623                         }
624                 }
625         else
626                 {
627                 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
628                         s->s2->tmp.session_id_length);
629                 if (i == 1)
630                         { /* previous session */
631                         s->hit=1;
632                         }
633                 else if (i == -1)
634                         {
635                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
636                         return(-1);
637                         }
638                 else
639                         {
640                         if (s->cert == NULL)
641                                 {
642                                 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
643                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
644                                 return(-1);
645                                 }
646
647                         if (!ssl_get_new_session(s,1))
648                                 {
649                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
650                                 return(-1);
651                                 }
652                         }
653                 }
654
655         if (!s->hit)
656                 {
657                 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
658                         &s->session->ciphers);
659                 if (cs == NULL) goto mem_err;
660
661                 cl=SSL_get_ciphers(s);
662
663                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
664                     {
665                     prio=sk_SSL_CIPHER_dup(cl);
666                     if (prio == NULL) goto mem_err;
667                     allow = cs;
668                     }
669                 else
670                     {
671                     prio = cs;
672                     allow = cl;
673                     }
674                 for (z=0; z<sk_SSL_CIPHER_num(prio); z++)
675                         {
676                         if (sk_SSL_CIPHER_find(allow,sk_SSL_CIPHER_value(prio,z)) < 0)
677                                 {
678                                 sk_SSL_CIPHER_delete(prio,z);
679                                 z--;
680                                 }
681                         }
682                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
683                     {
684                     sk_SSL_CIPHER_free(s->session->ciphers);
685                     s->session->ciphers = prio;
686                     }
687                 /* s->session->ciphers should now have a list of
688                  * ciphers that are on both the client and server.
689                  * This list is ordered by the order the client sent
690                  * the ciphers or in the order of the server's preference
691                  * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
692                  */
693                 }
694         p+=s->s2->tmp.cipher_spec_length;
695         /* done cipher selection */
696
697         /* session id extracted already */
698         p+=s->s2->tmp.session_id_length;
699
700         /* challenge */
701         if (s->s2->challenge_length > sizeof s->s2->challenge)
702                 {
703                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
704                 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
705                 return -1;
706                 }
707         memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
708         return(1);
709 mem_err:
710         SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
711         return(0);
712         }
713
714 static int server_hello(SSL *s)
715         {
716         unsigned char *p,*d;
717         int n,hit;
718         STACK_OF(SSL_CIPHER) *sk;
719
720         p=(unsigned char *)s->init_buf->data;
721         if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
722                 {
723                 d=p+11;
724                 *(p++)=SSL2_MT_SERVER_HELLO;            /* type */
725                 hit=s->hit;
726                 *(p++)=(unsigned char)hit;
727 #if 1
728                 if (!hit)
729                         {
730                         if (s->session->sess_cert != NULL)
731                                 /* This can't really happen because get_client_hello
732                                  * has called ssl_get_new_session, which does not set
733                                  * sess_cert. */
734                                 ssl_sess_cert_free(s->session->sess_cert);
735                         s->session->sess_cert = ssl_sess_cert_new();
736                         if (s->session->sess_cert == NULL)
737                                 {
738                                 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
739                                 return(-1);
740                                 }
741                         }
742                 /* If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
743                  * depending on whether it survived in the internal cache
744                  * or was retrieved from an external cache.
745                  * If it is NULL, we cannot put any useful data in it anyway,
746                  * so we don't touch it.
747                  */
748
749 #else /* That's what used to be done when cert_st and sess_cert_st were
750            * the same. */
751                 if (!hit)
752                         {                       /* else add cert to session */
753                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
754                         if (s->session->sess_cert != NULL)
755                                 ssl_cert_free(s->session->sess_cert);
756                         s->session->sess_cert=s->cert;          
757                         }
758                 else    /* We have a session id-cache hit, if the
759                          * session-id has no certificate listed against
760                          * the 'cert' structure, grab the 'old' one
761                          * listed against the SSL connection */
762                         {
763                         if (s->session->sess_cert == NULL)
764                                 {
765                                 CRYPTO_add(&s->cert->references,1,
766                                         CRYPTO_LOCK_SSL_CERT);
767                                 s->session->sess_cert=s->cert;
768                                 }
769                         }
770 #endif
771
772                 if (s->cert == NULL)
773                         {
774                         ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
775                         SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
776                         return(-1);
777                         }
778
779                 if (hit)
780                         {
781                         *(p++)=0;               /* no certificate type */
782                         s2n(s->version,p);      /* version */
783                         s2n(0,p);               /* cert len */
784                         s2n(0,p);               /* ciphers len */
785                         }
786                 else
787                         {
788                         /* EAY EAY */
789                         /* put certificate type */
790                         *(p++)=SSL2_CT_X509_CERTIFICATE;
791                         s2n(s->version,p);      /* version */
792                         n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
793                         s2n(n,p);               /* certificate length */
794                         i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
795                         n=0;
796                         
797                         /* lets send out the ciphers we like in the
798                          * prefered order */
799                         sk= s->session->ciphers;
800                         n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0);
801                         d+=n;
802                         s2n(n,p);               /* add cipher length */
803                         }
804
805                 /* make and send conn_id */
806                 s2n(SSL2_CONNECTION_ID_LENGTH,p);       /* add conn_id length */
807                 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
808                 if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0)
809                         return -1;
810                 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
811                 d+=SSL2_CONNECTION_ID_LENGTH;
812
813                 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
814                 s->init_num=d-(unsigned char *)s->init_buf->data;
815                 s->init_off=0;
816                 }
817         /* SSL2_ST_SEND_SERVER_HELLO_B */
818         /* If we are using TCP/IP, the performance is bad if we do 2
819          * writes without a read between them.  This occurs when
820          * Session-id reuse is used, so I will put in a buffering module
821          */
822         if (s->hit)
823                 {
824                 if (!ssl_init_wbio_buffer(s,1)) return(-1);
825                 }
826  
827         return(ssl2_do_write(s));
828         }
829
830 static int get_client_finished(SSL *s)
831         {
832         unsigned char *p;
833         int i, n;
834         unsigned long len;
835
836         p=(unsigned char *)s->init_buf->data;
837         if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
838                 {
839                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
840                 if (i < 1-s->init_num)
841                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
842                 s->init_num += i;
843
844                 if (*p != SSL2_MT_CLIENT_FINISHED)
845                         {
846                         if (*p != SSL2_MT_ERROR)
847                                 {
848                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
849                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
850                                 }
851                         else
852                                 {
853                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
854                                 /* try to read the error message */
855                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
856                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
857                                 }
858                         return(-1);
859                         }
860                 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
861                 }
862
863         /* SSL2_ST_GET_CLIENT_FINISHED_B */
864         if (s->s2->conn_id_length > sizeof s->s2->conn_id)
865                 {
866                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
867                 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
868                 return -1;
869                 }
870         len = 1 + (unsigned long)s->s2->conn_id_length;
871         n = (int)len - s->init_num;
872         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
873         if (i < n)
874                 {
875                 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
876                 }
877         if (s->msg_callback)
878                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */
879         p += 1;
880         if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0)
881                 {
882                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
883                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
884                 return(-1);
885                 }
886         return(1);
887         }
888
889 static int server_verify(SSL *s)
890         {
891         unsigned char *p;
892
893         if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
894                 {
895                 p=(unsigned char *)s->init_buf->data;
896                 *(p++)=SSL2_MT_SERVER_VERIFY;
897                 if (s->s2->challenge_length > sizeof s->s2->challenge)
898                         {
899                         SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
900                         return -1;
901                         }
902                 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
903                 /* p+=s->s2->challenge_length; */
904
905                 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
906                 s->init_num=s->s2->challenge_length+1;
907                 s->init_off=0;
908                 }
909         return(ssl2_do_write(s));
910         }
911
912 static int server_finish(SSL *s)
913         {
914         unsigned char *p;
915
916         if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
917                 {
918                 p=(unsigned char *)s->init_buf->data;
919                 *(p++)=SSL2_MT_SERVER_FINISHED;
920
921                 if (s->session->session_id_length > sizeof s->session->session_id)
922                         {
923                         SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
924                         return -1;
925                         }
926                 memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length);
927                 /* p+=s->session->session_id_length; */
928
929                 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
930                 s->init_num=s->session->session_id_length+1;
931                 s->init_off=0;
932                 }
933
934         /* SSL2_ST_SEND_SERVER_FINISHED_B */
935         return(ssl2_do_write(s));
936         }
937
938 /* send the request and check the response */
939 static int request_certificate(SSL *s)
940         {
941         const unsigned char *cp;
942         unsigned char *p,*p2,*buf2;
943         unsigned char *ccd;
944         int i,j,ctype,ret= -1;
945         unsigned long len;
946         X509 *x509=NULL;
947         STACK_OF(X509) *sk=NULL;
948
949         ccd=s->s2->tmp.ccl;
950         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
951                 {
952                 p=(unsigned char *)s->init_buf->data;
953                 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
954                 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
955                 if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
956                         return -1;
957                 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
958
959                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
960                 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
961                 s->init_off=0;
962                 }
963
964         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
965                 {
966                 i=ssl2_do_write(s);
967                 if (i <= 0)
968                         {
969                         ret=i;
970                         goto end;
971                         }
972
973                 s->init_num=0;
974                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
975                 }
976
977         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
978                 {
979                 p=(unsigned char *)s->init_buf->data;
980                 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */
981                 if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3
982                                         * (probably NO-CERTIFICATE-ERROR) */
983                         {
984                         ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
985                         goto end;
986                         }
987                 s->init_num += i;
988
989                 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR))
990                         {
991                         n2s(p,i);
992                         if (i != SSL2_PE_NO_CERTIFICATE)
993                                 {
994                                 /* not the error message we expected -- let ssl2_part_read handle it */
995                                 s->init_num -= 3;
996                                 ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3);
997                                 goto end;
998                                 }
999
1000                         if (s->msg_callback)
1001                                 s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */
1002
1003                         /* this is the one place where we can recover from an SSL 2.0 error */
1004
1005                         if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
1006                                 {
1007                                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1008                                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1009                                 goto end;
1010                                 }
1011                         ret=1;
1012                         goto end;
1013                         }
1014                 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6))
1015                         {
1016                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
1017                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
1018                         goto end;
1019                         }
1020                 if (s->init_num != 6)
1021                         {
1022                         SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1023                         goto end;
1024                         }
1025                 
1026                 /* ok we have a response */
1027                 /* certificate type, there is only one right now. */
1028                 ctype= *(p++);
1029                 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
1030                         {
1031                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1032                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
1033                         goto end;
1034                         }
1035                 n2s(p,i); s->s2->tmp.clen=i;
1036                 n2s(p,i); s->s2->tmp.rlen=i;
1037                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1038                 }
1039
1040         /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1041         p=(unsigned char *)s->init_buf->data;
1042         len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1043         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
1044                 {
1045                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG);
1046                 goto end;
1047                 }
1048         j = (int)len - s->init_num;
1049         i = ssl2_read(s,(char *)&(p[s->init_num]),j);
1050         if (i < j) 
1051                 {
1052                 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
1053                 goto end;
1054                 }
1055         if (s->msg_callback)
1056                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */
1057         p += 6;
1058
1059         cp = p;
1060         x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen);
1061         if (x509 == NULL)
1062                 {
1063                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
1064                 goto msg_end;
1065                 }
1066
1067         if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
1068                 {
1069                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1070                 goto msg_end;
1071                 }
1072
1073         i=ssl_verify_cert_chain(s,sk);
1074
1075         if (i)  /* we like the packet, now check the chksum */
1076                 {
1077                 EVP_MD_CTX ctx;
1078                 EVP_PKEY *pkey=NULL;
1079
1080                 EVP_MD_CTX_init(&ctx);
1081                 EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL);
1082                 EVP_VerifyUpdate(&ctx,s->s2->key_material,
1083                                  s->s2->key_material_length);
1084                 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
1085
1086                 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
1087                 buf2=OPENSSL_malloc((unsigned int)i);
1088                 if (buf2 == NULL)
1089                         {
1090                         SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1091                         goto msg_end;
1092                         }
1093                 p2=buf2;
1094                 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
1095                 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
1096                 OPENSSL_free(buf2);
1097
1098                 pkey=X509_get_pubkey(x509);
1099                 if (pkey == NULL) goto end;
1100                 i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey);
1101                 EVP_PKEY_free(pkey);
1102                 EVP_MD_CTX_cleanup(&ctx);
1103
1104                 if (i) 
1105                         {
1106                         if (s->session->peer != NULL)
1107                                 X509_free(s->session->peer);
1108                         s->session->peer=x509;
1109                         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
1110                         s->session->verify_result = s->verify_result;
1111                         ret=1;
1112                         goto end;
1113                         }
1114                 else
1115                         {
1116                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
1117                         goto msg_end;
1118                         }
1119                 }
1120         else
1121                 {
1122 msg_end:
1123                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1124                 }
1125 end:
1126         sk_X509_free(sk);
1127         X509_free(x509);
1128         return(ret);
1129         }
1130
1131 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1132              unsigned char *to, int padding)
1133         {
1134         RSA *rsa;
1135         int i;
1136
1137         if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
1138                 {
1139                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
1140                 return(-1);
1141                 }
1142         if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
1143                 {
1144                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1145                 return(-1);
1146                 }
1147         rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1148
1149         /* we have the public key */
1150         i=RSA_private_decrypt(len,from,to,rsa,padding);
1151         if (i < 0)
1152                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
1153         return(i);
1154         }
1155 #else /* !OPENSSL_NO_SSL2 */
1156
1157 # if PEDANTIC
1158 static void *dummy=&dummy;
1159 # endif
1160
1161 #endif