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 const 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 const 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 IMPLEMENT_ssl2_meth_func(SSLv2_server_method,
 141                         ssl2_accept,
 142                         ssl_undefined_function,
 143                         ssl2_get_server_method)
 144
 145 int ssl2_accept(SSL *s)
 146         {
 147         unsigned long l=(unsigned long)time(NULL);
 148         BUF_MEM *buf=NULL;
 149         int ret= -1;
 150         long num1;
 151         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 152         int new_state,state;
 153
 154         RAND_add(&l,sizeof(l),0);
 155         ERR_clear_error();
 156         clear_sys_error();
 157
 158         if (s->info_callback != NULL)
 159                 cb=s->info_callback;
 160         else if (s->ctx->info_callback != NULL)
 161                 cb=s->ctx->info_callback;
 162
 163         /* init things to blank */
 164         s->in_handshake++;
 165         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 166
 167         if (s->cert == NULL)
 168                 {
 169                 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 170                 return(-1);
 171                 }
 172
 173         clear_sys_error();
 174         for (;;)
 175                 {
 176                 state=s->state;
 177
 178                 switch (s->state)
 179                         {
 180                 case SSL_ST_BEFORE:
 181                 case SSL_ST_ACCEPT:
 182                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 183                 case SSL_ST_OK|SSL_ST_ACCEPT:
 184
 185                         s->server=1;
 186                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 187
 188                         s->version=SSL2_VERSION;
 189                         s->type=SSL_ST_ACCEPT;
 190
 191                         if(s->init_buf == NULL)
 192                                 {
 193                                 if ((buf=BUF_MEM_new()) == NULL)
 194                                         {
 195                                         ret= -1;
 196                                         goto end;
 197                                         }
 198                                 if (!BUF_MEM_grow(buf,(int) SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 199                                         {
 200                                         BUF_MEM_free(buf);
 201                                         ret= -1;
 202                                         goto end;
 203                                         }
 204                                 s->init_buf=buf;
 205                                 }
 206                         s->init_num=0;
 207                         s->ctx->stats.sess_accept++;
 208                         s->handshake_func=ssl2_accept;
 209                         s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 210                         BREAK;
 211
 212                 case SSL2_ST_GET_CLIENT_HELLO_A:
 213                 case SSL2_ST_GET_CLIENT_HELLO_B:
 214                 case SSL2_ST_GET_CLIENT_HELLO_C:
 215                         s->shutdown=0;
 216                         ret=get_client_hello(s);
 217                         if (ret <= 0) goto end;
 218                         s->init_num=0;
 219                         s->state=SSL2_ST_SEND_SERVER_HELLO_A;
 220                         BREAK;
 221
 222                 case SSL2_ST_SEND_SERVER_HELLO_A:
 223                 case SSL2_ST_SEND_SERVER_HELLO_B:
 224                         ret=server_hello(s);
 225                         if (ret <= 0) goto end;
 226                         s->init_num=0;
 227                         if (!s->hit)
 228                                 {
 229                                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
 230                                 BREAK;
 231                                 }
 232                         else
 233                                 {
 234                                 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 235                                 BREAK;
 236                                 }
 237                 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
 238                 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
 239                         ret=get_client_master_key(s);
 240                         if (ret <= 0) goto end;
 241                         s->init_num=0;
 242                         s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 243                         BREAK;
 244
 245                 case SSL2_ST_SERVER_START_ENCRYPTION:
 246                         /* Ok we how have sent all the stuff needed to
 247                          * start encrypting, the next packet back will
 248                          * be encrypted. */
 249                         if (!ssl2_enc_init(s,0))
 250                                 { ret= -1; goto end; }
 251                         s->s2->clear_text=0;
 252                         s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
 253                         BREAK;
 254
 255                 case SSL2_ST_SEND_SERVER_VERIFY_A:
 256                 case SSL2_ST_SEND_SERVER_VERIFY_B:
 257                         ret=server_verify(s);
 258                         if (ret <= 0) goto end;
 259                         s->init_num=0;
 260                         if (s->hit)
 261                                 {
 262                                 /* If we are in here, we have been
 263                                  * buffering the output, so we need to
 264                                  * flush it and remove buffering from
 265                                  * future traffic */
 266                                 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
 267                                 BREAK;
 268                                 }
 269                         else
 270                                 {
 271                                 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 272                                 break;
 273                                 }
 274
 275                 case SSL2_ST_SEND_SERVER_VERIFY_C:
 276                         /* get the number of bytes to write */
 277                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 278                         if (num1 > 0)
 279                                 {
 280                                 s->rwstate=SSL_WRITING;
 281                                 num1=BIO_flush(s->wbio);
 282                                 if (num1 <= 0) { ret= -1; goto end; }
 283                                 s->rwstate=SSL_NOTHING;
 284                                 }
 285
 286                         /* flushed and now remove buffering */
 287                         s->wbio=BIO_pop(s->wbio);
 288
 289                         s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 290                         BREAK;
 291
 292                 case SSL2_ST_GET_CLIENT_FINISHED_A:
 293                 case SSL2_ST_GET_CLIENT_FINISHED_B:
 294                         ret=get_client_finished(s);
 295                         if (ret <= 0)
 296                                 goto end;
 297                         s->init_num=0;
 298                         s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
 299                         BREAK;
 300
 301                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
 302                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
 303                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
 304                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
 305                         /* don't do a 'request certificate' if we
 306                          * don't want to, or we already have one, and
 307                          * we only want to do it once. */
 308                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 309                                 ((s->session->peer != NULL) &&
 310                                 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 311                                 {
 312                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 313                                 break;
 314                                 }
 315                         else
 316                                 {
 317                                 ret=request_certificate(s);
 318                                 if (ret <= 0) goto end;
 319                                 s->init_num=0;
 320                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 321                                 }
 322                         BREAK;
 323
 324                 case SSL2_ST_SEND_SERVER_FINISHED_A:
 325                 case SSL2_ST_SEND_SERVER_FINISHED_B:
 326                         ret=server_finish(s);
 327                         if (ret <= 0) goto end;
 328                         s->init_num=0;
 329                         s->state=SSL_ST_OK;
 330                         break;
 331
 332                 case SSL_ST_OK:
 333                         BUF_MEM_free(s->init_buf);
 334                         ssl_free_wbio_buffer(s);
 335                         s->init_buf=NULL;
 336                         s->init_num=0;
 337                 /*      ERR_clear_error();*/
 338
 339                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 340
 341                         s->ctx->stats.sess_accept_good++;
 342                         /* s->server=1; */
 343                         ret=1;
 344
 345                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 346
 347                         goto end;
 348                         /* BREAK; */
 349
 350                 default:
 351                         SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
 352                         ret= -1;
 353                         goto end;
 354                         /* BREAK; */
 355                         }
 356
 357                 if ((cb != NULL) && (s->state != state))
 358                         {
 359                         new_state=s->state;
 360                         s->state=state;
 361                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 362                         s->state=new_state;
 363                         }
 364                 }
 365 end:
 366         s->in_handshake--;
 367         if (cb != NULL)
 368                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 369         return(ret);
 370         }
 371
 372 static int get_client_master_key(SSL *s)
 373         {
 374         int is_export,i,n,keya,ek;
 375         unsigned long len;
 376         unsigned char *p;
 377         const SSL_CIPHER *cp;
 378         const EVP_CIPHER *c;
 379         const EVP_MD *md;
 380
 381         p=(unsigned char *)s->init_buf->data;
 382         if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
 383                 {
 384                 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
 385
 386                 if (i < (10-s->init_num))
 387                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 388                 s->init_num = 10;
 389
 390                 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
 391                         {
 392                         if (p[-1] != SSL2_MT_ERROR)
 393                                 {
 394                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 395                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
 396                                 }
 397                         else
 398                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
 399                         return(-1);
 400                         }
 401
 402                 cp=ssl2_get_cipher_by_char(p);
 403                 if (cp == NULL)
 404                         {
 405                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 406                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
 407                         return(-1);
 408                         }
 409                 s->session->cipher= cp;
 410
 411                 p+=3;
 412                 n2s(p,i); s->s2->tmp.clear=i;
 413                 n2s(p,i); s->s2->tmp.enc=i;
 414                 n2s(p,i);
 415                 if(i > SSL_MAX_KEY_ARG_LENGTH)
 416                         {
 417                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 418                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
 419                         return -1;
 420                         }
 421                 s->session->key_arg_length=i;
 422                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
 423                 }
 424
 425         /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
 426         p=(unsigned char *)s->init_buf->data;
 427         if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 428                 {
 429                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 430                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
 431                 return -1;
 432                 }
 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                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 438                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG);
 439                 return -1;
 440                 }
 441         n = (int)len - s->init_num;
 442         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 443         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 444         if (s->msg_callback)
 445                 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */
 446         p += 10;
 447
 448         memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
 449                 (unsigned int)keya);
 450
 451         if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
 452                 {
 453                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 454                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
 455                 return(-1);
 456                 }
 457         i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
 458                 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
 459                 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 460
 461         is_export=SSL_C_IS_EXPORT(s->session->cipher);
 462
 463         if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL))
 464                 {
 465                 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 466                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 467                 return(0);
 468                 }
 469
 470         if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 471                 {
 472                 is_export=1;
 473                 ek=8;
 474                 }
 475         else
 476                 ek=5;
 477
 478         /* bad decrypt */
 479 #if 1
 480         /* If a bad decrypt, continue with protocol but with a
 481          * random master secret (Bleichenbacher attack) */
 482         if ((i < 0) ||
 483                 ((!is_export && (i != EVP_CIPHER_key_length(c)))
 484                 || (is_export && ((i != ek) || (s->s2->tmp.clear+(unsigned int)i !=
 485                         (unsigned int)EVP_CIPHER_key_length(c))))))
 486                 {
 487                 ERR_clear_error();
 488                 if (is_export)
 489                         i=ek;
 490                 else
 491                         i=EVP_CIPHER_key_length(c);
 492                 if (RAND_pseudo_bytes(p,i) <= 0)
 493                         return 0;
 494                 }
 495 #else
 496         if (i < 0)
 497                 {
 498                 error=1;
 499                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
 500                 }
 501         /* incorrect number of key bytes for non export cipher */
 502         else if ((!is_export && (i != EVP_CIPHER_key_length(c)))
 503                 || (is_export && ((i != ek) || (s->s2->tmp.clear+i !=
 504                         EVP_CIPHER_key_length(c)))))
 505                 {
 506                 error=1;
 507                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
 508                 }
 509         if (error)
 510                 {
 511                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 512                 return(-1);
 513                 }
 514 #endif
 515
 516         if (is_export) i+=s->s2->tmp.clear;
 517
 518         if (i > SSL_MAX_MASTER_KEY_LENGTH)
 519                 {
 520                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 521                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
 522                 return -1;
 523                 }
 524         s->session->master_key_length=i;
 525         memcpy(s->session->master_key,p,(unsigned int)i);
 526         return(1);
 527         }
 528
 529 static int get_client_hello(SSL *s)
 530         {
 531         int i,n;
 532         unsigned long len;
 533         unsigned char *p;
 534         STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
 535         STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
 536         STACK_OF(SSL_CIPHER) *prio, *allow;
 537         int z;
 538
 539         /* This is a bit of a hack to check for the correct packet
 540          * type the first time round. */
 541         if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
 542                 {
 543                 s->first_packet=1;
 544                 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
 545                 }
 546
 547         p=(unsigned char *)s->init_buf->data;
 548         if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
 549                 {
 550                 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
 551                 if (i < (9-s->init_num))
 552                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 553                 s->init_num = 9;
 554
 555                 if (*(p++) != SSL2_MT_CLIENT_HELLO)
 556                         {
 557                         if (p[-1] != SSL2_MT_ERROR)
 558                                 {
 559                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 560                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
 561                                 }
 562                         else
 563                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
 564                         return(-1);
 565                         }
 566                 n2s(p,i);
 567                 if (i < s->version) s->version=i;
 568                 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
 569                 n2s(p,i); s->s2->tmp.session_id_length=i;
 570                 n2s(p,i); s->s2->challenge_length=i;
 571                 if (    (i < SSL2_MIN_CHALLENGE_LENGTH) ||
 572                         (i > SSL2_MAX_CHALLENGE_LENGTH))
 573                         {
 574                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 575                         SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
 576                         return(-1);
 577                         }
 578                 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
 579                 }
 580
 581         /* SSL2_ST_GET_CLIENT_HELLO_C */
 582         p=(unsigned char *)s->init_buf->data;
 583         len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length;
 584         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 585                 {
 586                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 587                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG);
 588                 return -1;
 589                 }
 590         n = (int)len - s->init_num;
 591         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 592         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 593         if (s->msg_callback)
 594                 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */
 595         p += 9;
 596
 597         /* get session-id before cipher stuff so we can get out session
 598          * structure if it is cached */
 599         /* session-id */
 600         if ((s->s2->tmp.session_id_length != 0) &&
 601                 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
 602                 {
 603                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 604                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
 605                 return(-1);
 606                 }
 607
 608         if (s->s2->tmp.session_id_length == 0)
 609                 {
 610                 if (!ssl_get_new_session(s,1))
 611                         {
 612                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 613                         return(-1);
 614                         }
 615                 }
 616         else
 617                 {
 618                 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
 619                         s->s2->tmp.session_id_length, NULL);
 620                 if (i == 1)
 621                         { /* previous session */
 622                         s->hit=1;
 623                         }
 624                 else if (i == -1)
 625                         {
 626                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 627                         return(-1);
 628                         }
 629                 else
 630                         {
 631                         if (s->cert == NULL)
 632                                 {
 633                                 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 634                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
 635                                 return(-1);
 636                                 }
 637
 638                         if (!ssl_get_new_session(s,1))
 639                                 {
 640                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 641                                 return(-1);
 642                                 }
 643                         }
 644                 }
 645
 646         if (!s->hit)
 647                 {
 648                 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
 649                         &s->session->ciphers);
 650                 if (cs == NULL) goto mem_err;
 651
 652                 cl=SSL_get_ciphers(s);
 653
 654                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
 655                     {
 656                     prio=sk_SSL_CIPHER_dup(cl);
 657                     if (prio == NULL) goto mem_err;
 658                     allow = cs;
 659                     }
 660                 else
 661                     {
 662                     prio = cs;
 663                     allow = cl;
 664                     }
 665                 for (z=0; z<sk_SSL_CIPHER_num(prio); z++)
 666                         {
 667                         if (sk_SSL_CIPHER_find(allow,sk_SSL_CIPHER_value(prio,z)) < 0)
 668                                 {
 669                                 (void)sk_SSL_CIPHER_delete(prio,z);
 670                                 z--;
 671                                 }
 672                         }
 673                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
 674                     {
 675                     sk_SSL_CIPHER_free(s->session->ciphers);
 676                     s->session->ciphers = prio;
 677                     }
 678                 /* s->session->ciphers should now have a list of
 679                  * ciphers that are on both the client and server.
 680                  * This list is ordered by the order the client sent
 681                  * the ciphers or in the order of the server's preference
 682                  * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
 683                  */
 684                 }
 685         p+=s->s2->tmp.cipher_spec_length;
 686         /* done cipher selection */
 687
 688         /* session id extracted already */
 689         p+=s->s2->tmp.session_id_length;
 690
 691         /* challenge */
 692         if (s->s2->challenge_length > sizeof s->s2->challenge)
 693                 {
 694                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 695                 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 696                 return -1;
 697                 }
 698         memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
 699         return(1);
 700 mem_err:
 701         SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 702         return(0);
 703         }
 704
 705 static int server_hello(SSL *s)
 706         {
 707         unsigned char *p,*d;
 708         int n,hit;
 709
 710         p=(unsigned char *)s->init_buf->data;
 711         if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
 712                 {
 713                 d=p+11;
 714                 *(p++)=SSL2_MT_SERVER_HELLO;            /* type */
 715                 hit=s->hit;
 716                 *(p++)=(unsigned char)hit;
 717 #if 1
 718                 if (!hit)
 719                         {
 720                         if (s->session->sess_cert != NULL)
 721                                 /* This can't really happen because get_client_hello
 722                                  * has called ssl_get_new_session, which does not set
 723                                  * sess_cert. */
 724                                 ssl_sess_cert_free(s->session->sess_cert);
 725                         s->session->sess_cert = ssl_sess_cert_new();
 726                         if (s->session->sess_cert == NULL)
 727                                 {
 728                                 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
 729                                 return(-1);
 730                                 }
 731                         }
 732                 /* If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
 733                  * depending on whether it survived in the internal cache
 734                  * or was retrieved from an external cache.
 735                  * If it is NULL, we cannot put any useful data in it anyway,
 736                  * so we don't touch it.
 737                  */
 738
 739 #else /* That's what used to be done when cert_st and sess_cert_st were
 740            * the same. */
 741                 if (!hit)
 742                         {                       /* else add cert to session */
 743                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 744                         if (s->session->sess_cert != NULL)
 745                                 ssl_cert_free(s->session->sess_cert);
 746                         s->session->sess_cert=s->cert;
 747                         }
 748                 else    /* We have a session id-cache hit, if the
 749                          * session-id has no certificate listed against
 750                          * the 'cert' structure, grab the 'old' one
 751                          * listed against the SSL connection */
 752                         {
 753                         if (s->session->sess_cert == NULL)
 754                                 {
 755                                 CRYPTO_add(&s->cert->references,1,
 756                                         CRYPTO_LOCK_SSL_CERT);
 757                                 s->session->sess_cert=s->cert;
 758                                 }
 759                         }
 760 #endif
 761
 762                 if (s->cert == NULL)
 763                         {
 764                         ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 765                         SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
 766                         return(-1);
 767                         }
 768
 769                 if (hit)
 770                         {
 771                         *(p++)=0;               /* no certificate type */
 772                         s2n(s->version,p);      /* version */
 773                         s2n(0,p);               /* cert len */
 774                         s2n(0,p);               /* ciphers len */
 775                         }
 776                 else
 777                         {
 778                         /* EAY EAY */
 779                         /* put certificate type */
 780                         *(p++)=SSL2_CT_X509_CERTIFICATE;
 781                         s2n(s->version,p);      /* version */
 782                         n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 783                         s2n(n,p);               /* certificate length */
 784                         i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
 785                         n=0;
 786
 787                         /* lets send out the ciphers we like in the
 788                          * prefered order */
 789                         n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0);
 790                         d+=n;
 791                         s2n(n,p);               /* add cipher length */
 792                         }
 793
 794                 /* make and send conn_id */
 795                 s2n(SSL2_CONNECTION_ID_LENGTH,p);       /* add conn_id length */
 796                 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
 797                 if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0)
 798                         return -1;
 799                 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
 800                 d+=SSL2_CONNECTION_ID_LENGTH;
 801
 802                 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
 803                 s->init_num=d-(unsigned char *)s->init_buf->data;
 804                 s->init_off=0;
 805                 }
 806         /* SSL2_ST_SEND_SERVER_HELLO_B */
 807         /* If we are using TCP/IP, the performance is bad if we do 2
 808          * writes without a read between them.  This occurs when
 809          * Session-id reuse is used, so I will put in a buffering module
 810          */
 811         if (s->hit)
 812                 {
 813                 if (!ssl_init_wbio_buffer(s,1)) return(-1);
 814                 }
 815
 816         return(ssl2_do_write(s));
 817         }
 818
 819 static int get_client_finished(SSL *s)
 820         {
 821         unsigned char *p;
 822         int i, n;
 823         unsigned long len;
 824
 825         p=(unsigned char *)s->init_buf->data;
 826         if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
 827                 {
 828                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 829                 if (i < 1-s->init_num)
 830                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 831                 s->init_num += i;
 832
 833                 if (*p != SSL2_MT_CLIENT_FINISHED)
 834                         {
 835                         if (*p != SSL2_MT_ERROR)
 836                                 {
 837                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 838                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 839                                 }
 840                         else
 841                                 {
 842                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
 843                                 /* try to read the error message */
 844                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
 845                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
 846                                 }
 847                         return(-1);
 848                         }
 849                 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
 850                 }
 851
 852         /* SSL2_ST_GET_CLIENT_FINISHED_B */
 853         if (s->s2->conn_id_length > sizeof s->s2->conn_id)
 854                 {
 855                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 856                 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
 857                 return -1;
 858                 }
 859         len = 1 + (unsigned long)s->s2->conn_id_length;
 860         n = (int)len - s->init_num;
 861         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 862         if (i < n)
 863                 {
 864                 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 865                 }
 866         if (s->msg_callback)
 867                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */
 868         p += 1;
 869         if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0)
 870                 {
 871                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 872                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
 873                 return(-1);
 874                 }
 875         return(1);
 876         }
 877
 878 static int server_verify(SSL *s)
 879         {
 880         unsigned char *p;
 881
 882         if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
 883                 {
 884                 p=(unsigned char *)s->init_buf->data;
 885                 *(p++)=SSL2_MT_SERVER_VERIFY;
 886                 if (s->s2->challenge_length > sizeof s->s2->challenge)
 887                         {
 888                         SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
 889                         return -1;
 890                         }
 891                 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
 892                 /* p+=s->s2->challenge_length; */
 893
 894                 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
 895                 s->init_num=s->s2->challenge_length+1;
 896                 s->init_off=0;
 897                 }
 898         return(ssl2_do_write(s));
 899         }
 900
 901 static int server_finish(SSL *s)
 902         {
 903         unsigned char *p;
 904
 905         if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
 906                 {
 907                 p=(unsigned char *)s->init_buf->data;
 908                 *(p++)=SSL2_MT_SERVER_FINISHED;
 909
 910                 if (s->session->session_id_length > sizeof s->session->session_id)
 911                         {
 912                         SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
 913                         return -1;
 914                         }
 915                 memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length);
 916                 /* p+=s->session->session_id_length; */
 917
 918                 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
 919                 s->init_num=s->session->session_id_length+1;
 920                 s->init_off=0;
 921                 }
 922
 923         /* SSL2_ST_SEND_SERVER_FINISHED_B */
 924         return(ssl2_do_write(s));
 925         }
 926
 927 /* send the request and check the response */
 928 static int request_certificate(SSL *s)
 929         {
 930         const unsigned char *cp;
 931         unsigned char *p,*p2,*buf2;
 932         unsigned char *ccd;
 933         int i,j,ctype,ret= -1;
 934         unsigned long len;
 935         X509 *x509=NULL;
 936         STACK_OF(X509) *sk=NULL;
 937
 938         ccd=s->s2->tmp.ccl;
 939         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
 940                 {
 941                 p=(unsigned char *)s->init_buf->data;
 942                 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
 943                 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
 944                 if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
 945                         return -1;
 946                 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 947
 948                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
 949                 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
 950                 s->init_off=0;
 951                 }
 952
 953         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
 954                 {
 955                 i=ssl2_do_write(s);
 956                 if (i <= 0)
 957                         {
 958                         ret=i;
 959                         goto end;
 960                         }
 961
 962                 s->init_num=0;
 963                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
 964                 }
 965
 966         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
 967                 {
 968                 p=(unsigned char *)s->init_buf->data;
 969                 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */
 970                 if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3
 971                                         * (probably NO-CERTIFICATE-ERROR) */
 972                         {
 973                         ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 974                         goto end;
 975                         }
 976                 s->init_num += i;
 977
 978                 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR))
 979                         {
 980                         n2s(p,i);
 981                         if (i != SSL2_PE_NO_CERTIFICATE)
 982                                 {
 983                                 /* not the error message we expected -- let ssl2_part_read handle it */
 984                                 s->init_num -= 3;
 985                                 ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3);
 986                                 goto end;
 987                                 }
 988
 989                         if (s->msg_callback)
 990                                 s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */
 991
 992                         /* this is the one place where we can recover from an SSL 2.0 error */
 993
 994                         if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
 995                                 {
 996                                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 997                                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
 998                                 goto end;
 999                                 }
1000                         ret=1;
1001                         goto end;
1002                         }
1003                 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6))
1004                         {
1005                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
1006                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
1007                         goto end;
1008                         }
1009                 if (s->init_num != 6)
1010                         {
1011                         SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1012                         goto end;
1013                         }
1014
1015                 /* ok we have a response */
1016                 /* certificate type, there is only one right now. */
1017                 ctype= *(p++);
1018                 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
1019                         {
1020                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1021                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
1022                         goto end;
1023                         }
1024                 n2s(p,i); s->s2->tmp.clen=i;
1025                 n2s(p,i); s->s2->tmp.rlen=i;
1026                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1027                 }
1028
1029         /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1030         p=(unsigned char *)s->init_buf->data;
1031         len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1032         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
1033                 {
1034                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG);
1035                 goto end;
1036                 }
1037         j = (int)len - s->init_num;
1038         i = ssl2_read(s,(char *)&(p[s->init_num]),j);
1039         if (i < j)
1040                 {
1041                 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
1042                 goto end;
1043                 }
1044         if (s->msg_callback)
1045                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */
1046         p += 6;
1047
1048         cp = p;
1049         x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen);
1050         if (x509 == NULL)
1051                 {
1052                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
1053                 goto msg_end;
1054                 }
1055
1056         if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
1057                 {
1058                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1059                 goto msg_end;
1060                 }
1061
1062         i=ssl_verify_cert_chain(s,sk);
1063
1064         if (i > 0)      /* we like the packet, now check the chksum */
1065                 {
1066                 EVP_MD_CTX ctx;
1067                 EVP_PKEY *pkey=NULL;
1068
1069                 EVP_MD_CTX_init(&ctx);
1070                 if (!EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL)
1071                     || !EVP_VerifyUpdate(&ctx,s->s2->key_material,
1072                                          s->s2->key_material_length)
1073                     || !EVP_VerifyUpdate(&ctx,ccd,
1074                                          SSL2_MIN_CERT_CHALLENGE_LENGTH))
1075                         goto msg_end;
1076
1077                 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
1078                 buf2=OPENSSL_malloc((unsigned int)i);
1079                 if (buf2 == NULL)
1080                         {
1081                         SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1082                         goto msg_end;
1083                         }
1084                 p2=buf2;
1085                 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
1086                 if (!EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i))
1087                         {
1088                         OPENSSL_free(buf2);
1089                         goto msg_end;
1090                         }
1091                 OPENSSL_free(buf2);
1092
1093                 pkey=X509_get_pubkey(x509);
1094                 if (pkey == NULL) goto end;
1095                 i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey);
1096                 EVP_PKEY_free(pkey);
1097                 EVP_MD_CTX_cleanup(&ctx);
1098
1099                 if (i > 0)
1100                         {
1101                         if (s->session->peer != NULL)
1102                                 X509_free(s->session->peer);
1103                         s->session->peer=x509;
1104                         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
1105                         s->session->verify_result = s->verify_result;
1106                         ret=1;
1107                         goto end;
1108                         }
1109                 else
1110                         {
1111                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
1112                         goto msg_end;
1113                         }
1114                 }
1115         else
1116                 {
1117 msg_end:
1118                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1119                 }
1120 end:
1121         sk_X509_free(sk);
1122         X509_free(x509);
1123         return(ret);
1124         }
1125
1126 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1127              unsigned char *to, int padding)
1128         {
1129         RSA *rsa;
1130         int i;
1131
1132         if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
1133                 {
1134                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
1135                 return(-1);
1136                 }
1137         if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
1138                 {
1139                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1140                 return(-1);
1141                 }
1142         rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1143
1144         /* we have the public key */
1145         i=RSA_private_decrypt(len,from,to,rsa,padding);
1146         if (i < 0)
1147                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
1148         return(i);
1149         }
1150 #else /* !OPENSSL_NO_SSL2 */
1151
1152 # if PEDANTIC
1153 static void *dummy=&dummy;
1154 # endif
1155
1156 #endif