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