ssl/s2_srvr.c

   1 /* ssl/s2_srvr.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include "ssl_locl.h"
 113 #ifndef OPENSSL_NO_SSL2
 114 #include <stdio.h>
 115 #include <openssl/bio.h>
 116 #include <openssl/rand.h>
 117 #include <openssl/objects.h>
 118 #include <openssl/evp.h>
 119
 120 static SSL_METHOD *ssl2_get_server_method(int ver);
 121 static int get_client_master_key(SSL *s);
 122 static int get_client_hello(SSL *s);
 123 static int server_hello(SSL *s);
 124 static int get_client_finished(SSL *s);
 125 static int server_verify(SSL *s);
 126 static int server_finish(SSL *s);
 127 static int request_certificate(SSL *s);
 128 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
 129         unsigned char *to,int padding);
 130 #define BREAK   break
 131
 132 static SSL_METHOD *ssl2_get_server_method(int ver)
 133         {
 134         if (ver == SSL2_VERSION)
 135                 return(SSLv2_server_method());
 136         else
 137                 return(NULL);
 138         }
 139
 140 SSL_METHOD *SSLv2_server_method(void)
 141         {
 142         static int init=1;
 143         static SSL_METHOD SSLv2_server_data;
 144
 145         if (init)
 146                 {
 147                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 148
 149                 if (init)
 150                         {
 151                         memcpy((char *)&SSLv2_server_data,(char *)sslv2_base_method(),
 152                                 sizeof(SSL_METHOD));
 153                         SSLv2_server_data.ssl_accept=ssl2_accept;
 154                         SSLv2_server_data.get_ssl_method=ssl2_get_server_method;
 155                         init=0;
 156                         }
 157
 158                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 159                 }
 160         return(&SSLv2_server_data);
 161         }
 162
 163 int ssl2_accept(SSL *s)
 164         {
 165         unsigned long l=time(NULL);
 166         BUF_MEM *buf=NULL;
 167         int ret= -1;
 168         long num1;
 169         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 170         int new_state,state;
 171
 172         RAND_add(&l,sizeof(l),0);
 173         ERR_clear_error();
 174         clear_sys_error();
 175
 176         if (s->info_callback != NULL)
 177                 cb=s->info_callback;
 178         else if (s->ctx->info_callback != NULL)
 179                 cb=s->ctx->info_callback;
 180
 181         /* init things to blank */
 182         s->in_handshake++;
 183         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 184
 185         if (s->cert == NULL)
 186                 {
 187                 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 188                 return(-1);
 189                 }
 190
 191         clear_sys_error();
 192         for (;;)
 193                 {
 194                 state=s->state;
 195
 196                 switch (s->state)
 197                         {
 198                 case SSL_ST_BEFORE:
 199                 case SSL_ST_ACCEPT:
 200                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 201                 case SSL_ST_OK|SSL_ST_ACCEPT:
 202
 203                         s->server=1;
 204                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 205
 206                         s->version=SSL2_VERSION;
 207                         s->type=SSL_ST_ACCEPT;
 208
 209                         buf=s->init_buf;
 210                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 211                                 { ret= -1; goto end; }
 212                         if (!BUF_MEM_grow(buf,(int)
 213                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 214                                 { ret= -1; goto end; }
 215                         s->init_buf=buf;
 216                         s->init_num=0;
 217                         s->ctx->stats.sess_accept++;
 218                         s->handshake_func=ssl2_accept;
 219                         s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 220                         BREAK;
 221
 222                 case SSL2_ST_GET_CLIENT_HELLO_A:
 223                 case SSL2_ST_GET_CLIENT_HELLO_B:
 224                 case SSL2_ST_GET_CLIENT_HELLO_C:
 225                         s->shutdown=0;
 226                         ret=get_client_hello(s);
 227                         if (ret <= 0) goto end;
 228                         s->init_num=0;
 229                         s->state=SSL2_ST_SEND_SERVER_HELLO_A;
 230                         BREAK;
 231
 232                 case SSL2_ST_SEND_SERVER_HELLO_A:
 233                 case SSL2_ST_SEND_SERVER_HELLO_B:
 234                         ret=server_hello(s);
 235                         if (ret <= 0) goto end;
 236                         s->init_num=0;
 237                         if (!s->hit)
 238                                 {
 239                                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
 240                                 BREAK;
 241                                 }
 242                         else
 243                                 {
 244                                 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 245                                 BREAK;
 246                                 }
 247                 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
 248                 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
 249                         ret=get_client_master_key(s);
 250                         if (ret <= 0) goto end;
 251                         s->init_num=0;
 252                         s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 253                         BREAK;
 254
 255                 case SSL2_ST_SERVER_START_ENCRYPTION:
 256                         /* Ok we how have sent all the stuff needed to
 257                          * start encrypting, the next packet back will
 258                          * be encrypted. */
 259                         if (!ssl2_enc_init(s,0))
 260                                 { ret= -1; goto end; }
 261                         s->s2->clear_text=0;
 262                         s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
 263                         BREAK;
 264
 265                 case SSL2_ST_SEND_SERVER_VERIFY_A:
 266                 case SSL2_ST_SEND_SERVER_VERIFY_B:
 267                         ret=server_verify(s);
 268                         if (ret <= 0) goto end;
 269                         s->init_num=0;
 270                         if (s->hit)
 271                                 {
 272                                 /* If we are in here, we have been
 273                                  * buffering the output, so we need to
 274                                  * flush it and remove buffering from
 275                                  * future traffic */
 276                                 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
 277                                 BREAK;
 278                                 }
 279                         else
 280                                 {
 281                                 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 282                                 break;
 283                                 }
 284
 285                 case SSL2_ST_SEND_SERVER_VERIFY_C:
 286                         /* get the number of bytes to write */
 287                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 288                         if (num1 != 0)
 289                                 {
 290                                 s->rwstate=SSL_WRITING;
 291                                 num1=BIO_flush(s->wbio);
 292                                 if (num1 <= 0) { ret= -1; goto end; }
 293                                 s->rwstate=SSL_NOTHING;
 294                                 }
 295
 296                         /* flushed and now remove buffering */
 297                         s->wbio=BIO_pop(s->wbio);
 298
 299                         s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 300                         BREAK;
 301
 302                 case SSL2_ST_GET_CLIENT_FINISHED_A:
 303                 case SSL2_ST_GET_CLIENT_FINISHED_B:
 304                         ret=get_client_finished(s);
 305                         if (ret <= 0)
 306                                 goto end;
 307                         s->init_num=0;
 308                         s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
 309                         BREAK;
 310
 311                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
 312                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
 313                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
 314                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
 315                         /* don't do a 'request certificate' if we
 316                          * don't want to, or we already have one, and
 317                          * we only want to do it once. */
 318                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 319                                 ((s->session->peer != NULL) &&
 320                                 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 321                                 {
 322                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 323                                 break;
 324                                 }
 325                         else
 326                                 {
 327                                 ret=request_certificate(s);
 328                                 if (ret <= 0) goto end;
 329                                 s->init_num=0;
 330                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 331                                 }
 332                         BREAK;
 333
 334                 case SSL2_ST_SEND_SERVER_FINISHED_A:
 335                 case SSL2_ST_SEND_SERVER_FINISHED_B:
 336                         ret=server_finish(s);
 337                         if (ret <= 0) goto end;
 338                         s->init_num=0;
 339                         s->state=SSL_ST_OK;
 340                         break;
 341
 342                 case SSL_ST_OK:
 343                         BUF_MEM_free(s->init_buf);
 344                         ssl_free_wbio_buffer(s);
 345                         s->init_buf=NULL;
 346                         s->init_num=0;
 347                 /*      ERR_clear_error();*/
 348
 349                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 350
 351                         s->ctx->stats.sess_accept_good++;
 352                         /* s->server=1; */
 353                         ret=1;
 354
 355                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 356
 357                         goto end;
 358                         /* BREAK; */
 359
 360                 default:
 361                         SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
 362                         ret= -1;
 363                         goto end;
 364                         /* BREAK; */
 365                         }
 366
 367                 if ((cb != NULL) && (s->state != state))
 368                         {
 369                         new_state=s->state;
 370                         s->state=state;
 371                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 372                         s->state=new_state;
 373                         }
 374                 }
 375 end:
 376         s->in_handshake--;
 377         if (cb != NULL)
 378                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 379         return(ret);
 380         }
 381
 382 static int get_client_master_key(SSL *s)
 383         {
 384         int is_export,i,n,keya,ek;
 385         unsigned long len;
 386         unsigned char *p;
 387         SSL_CIPHER *cp;
 388         const EVP_CIPHER *c;
 389         const EVP_MD *md;
 390
 391         p=(unsigned char *)s->init_buf->data;
 392         if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
 393                 {
 394                 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
 395
 396                 if (i < (10-s->init_num))
 397                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 398                 s->init_num = 10;
 399
 400                 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
 401                         {
 402                         if (p[-1] != SSL2_MT_ERROR)
 403                                 {
 404                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 405                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
 406                                 }
 407                         else
 408                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
 409                         return(-1);
 410                         }
 411
 412                 cp=ssl2_get_cipher_by_char(p);
 413                 if (cp == NULL)
 414                         {
 415                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 416                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
 417                         return(-1);
 418                         }
 419                 s->session->cipher= cp;
 420
 421                 p+=3;
 422                 n2s(p,i); s->s2->tmp.clear=i;
 423                 n2s(p,i); s->s2->tmp.enc=i;
 424                 n2s(p,i); s->session->key_arg_length=i;
 425                 if(s->session->key_arg_length > SSL_MAX_KEY_ARG_LENGTH)
 426                         {
 427                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 428                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
 429                         return -1;
 430                         }
 431                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
 432                 }
 433
 434         /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
 435         p=(unsigned char *)s->init_buf->data;
 436         if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 437                 {
 438                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 439                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
 440                 return -1;
 441                 }
 442         keya=s->session->key_arg_length;
 443         len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + (unsigned long)keya;
 444         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 445                 {
 446                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 447                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG);
 448                 return -1;
 449                 }
 450         n = (int)len - s->init_num;
 451         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 452         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 453         if (s->msg_callback)
 454                 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */
 455         p += 10;
 456
 457         memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
 458                 (unsigned int)keya);
 459
 460         if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
 461                 {
 462                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 463                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
 464                 return(-1);
 465                 }
 466         i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
 467                 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
 468                 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 469
 470         is_export=SSL_C_IS_EXPORT(s->session->cipher);
 471
 472         if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
 473                 {
 474                 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 475                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 476                 return(0);
 477                 }
 478
 479         if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 480                 {
 481                 is_export=1;
 482                 ek=8;
 483                 }
 484         else
 485                 ek=5;
 486
 487         /* bad decrypt */
 488 #if 1
 489         /* If a bad decrypt, continue with protocol but with a
 490          * random master secret (Bleichenbacher attack) */
 491         if ((i < 0) ||
 492                 ((!is_export && (i != EVP_CIPHER_key_length(c)))
 493                 || (is_export && ((i != ek) || (s->s2->tmp.clear+(unsigned int)i !=
 494                         (unsigned int)EVP_CIPHER_key_length(c))))))
 495                 {
 496                 ERR_clear_error();
 497                 if (is_export)
 498                         i=ek;
 499                 else
 500                         i=EVP_CIPHER_key_length(c);
 501                 if (RAND_pseudo_bytes(p,i) <= 0)
 502                         return 0;
 503                 }
 504 #else
 505         if (i < 0)
 506                 {
 507                 error=1;
 508                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
 509                 }
 510         /* incorrect number of key bytes for non export cipher */
 511         else if ((!is_export && (i != EVP_CIPHER_key_length(c)))
 512                 || (is_export && ((i != ek) || (s->s2->tmp.clear+i !=
 513                         EVP_CIPHER_key_length(c)))))
 514                 {
 515                 error=1;
 516                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
 517                 }
 518         if (error)
 519                 {
 520                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 521                 return(-1);
 522                 }
 523 #endif
 524
 525         if (is_export) i+=s->s2->tmp.clear;
 526
 527         if (i > SSL_MAX_MASTER_KEY_LENGTH)
 528                 {
 529                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 530                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
 531                 return -1;
 532                 }
 533         s->session->master_key_length=i;
 534         memcpy(s->session->master_key,p,(unsigned int)i);
 535         return(1);
 536         }
 537
 538 static int get_client_hello(SSL *s)
 539         {
 540         int i,n;
 541         unsigned long len;
 542         unsigned char *p;
 543         STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
 544         STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
 545         STACK_OF(SSL_CIPHER) *prio, *allow;
 546         int z;
 547
 548         /* This is a bit of a hack to check for the correct packet
 549          * type the first time round. */
 550         if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
 551                 {
 552                 s->first_packet=1;
 553                 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
 554                 }
 555
 556         p=(unsigned char *)s->init_buf->data;
 557         if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
 558                 {
 559                 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
 560                 if (i < (9-s->init_num))
 561                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 562                 s->init_num = 9;
 563
 564                 if (*(p++) != SSL2_MT_CLIENT_HELLO)
 565                         {
 566                         if (p[-1] != SSL2_MT_ERROR)
 567                                 {
 568                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 569                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
 570                                 }
 571                         else
 572                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
 573                         return(-1);
 574                         }
 575                 n2s(p,i);
 576                 if (i < s->version) s->version=i;
 577                 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
 578                 n2s(p,i); s->s2->tmp.session_id_length=i;
 579                 n2s(p,i); s->s2->challenge_length=i;
 580                 if (    (i < SSL2_MIN_CHALLENGE_LENGTH) ||
 581                         (i > SSL2_MAX_CHALLENGE_LENGTH))
 582                         {
 583                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 584                         SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
 585                         return(-1);
 586                         }
 587                 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
 588                 }
 589
 590         /* SSL2_ST_GET_CLIENT_HELLO_C */
 591         p=(unsigned char *)s->init_buf->data;
 592         len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length;
 593         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 594                 {
 595                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 596                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG);
 597                 return -1;
 598                 }
 599         n = (int)len - s->init_num;
 600         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 601         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 602         if (s->msg_callback)
 603                 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */
 604         p += 9;
 605
 606         /* get session-id before cipher stuff so we can get out session
 607          * structure if it is cached */
 608         /* session-id */
 609         if ((s->s2->tmp.session_id_length != 0) &&
 610                 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
 611                 {
 612                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 613                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
 614                 return(-1);
 615                 }
 616
 617         if (s->s2->tmp.session_id_length == 0)
 618                 {
 619                 if (!ssl_get_new_session(s,1))
 620                         {
 621                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 622                         return(-1);
 623                         }
 624                 }
 625         else
 626                 {
 627                 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
 628                         s->s2->tmp.session_id_length);
 629                 if (i == 1)
 630                         { /* previous session */
 631                         s->hit=1;
 632                         }
 633                 else if (i == -1)
 634                         {
 635                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 636                         return(-1);
 637                         }
 638                 else
 639                         {
 640                         if (s->cert == NULL)
 641                                 {
 642                                 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 643                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
 644                                 return(-1);
 645                                 }
 646
 647                         if (!ssl_get_new_session(s,1))
 648                                 {
 649                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 650                                 return(-1);
 651                                 }
 652                         }
 653                 }
 654
 655         if (!s->hit)
 656                 {
 657                 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
 658                         &s->session->ciphers);
 659                 if (cs == NULL) goto mem_err;
 660
 661                 cl=SSL_get_ciphers(s);
 662
 663                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
 664                     {
 665                     prio=sk_SSL_CIPHER_dup(cl);
 666                     if (prio == NULL) goto mem_err;
 667                     allow = cs;
 668                     }
 669                 else
 670                     {
 671                     prio = cs;
 672                     allow = cl;
 673                     }
 674                 for (z=0; z<sk_SSL_CIPHER_num(prio); z++)
 675                         {
 676                         if (sk_SSL_CIPHER_find(allow,sk_SSL_CIPHER_value(prio,z)) < 0)
 677                                 {
 678                                 sk_SSL_CIPHER_delete(prio,z);
 679                                 z--;
 680                                 }
 681                         }
 682                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
 683                     {
 684                     sk_SSL_CIPHER_free(s->session->ciphers);
 685                     s->session->ciphers = prio;
 686                     }
 687                 /* s->session->ciphers should now have a list of
 688                  * ciphers that are on both the client and server.
 689                  * This list is ordered by the order the client sent
 690                  * the ciphers or in the order of the server's preference
 691                  * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
 692                  */
 693                 }
 694         p+=s->s2->tmp.cipher_spec_length;
 695         /* done cipher selection */
 696
 697         /* session id extracted already */
 698         p+=s->s2->tmp.session_id_length;
 699
 700         /* challenge */
 701         if (s->s2->challenge_length > sizeof s->s2->challenge)
 702                 {
 703                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 704                 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 705                 return -1;
 706                 }
 707         memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
 708         return(1);
 709 mem_err:
 710         SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 711         return(0);
 712         }
 713
 714 static int server_hello(SSL *s)
 715         {
 716         unsigned char *p,*d;
 717         int n,hit;
 718         STACK_OF(SSL_CIPHER) *sk;
 719
 720         p=(unsigned char *)s->init_buf->data;
 721         if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
 722                 {
 723                 d=p+11;
 724                 *(p++)=SSL2_MT_SERVER_HELLO;            /* type */
 725                 hit=s->hit;
 726                 *(p++)=(unsigned char)hit;
 727 #if 1
 728                 if (!hit)
 729                         {
 730                         if (s->session->sess_cert != NULL)
 731                                 /* This can't really happen because get_client_hello
 732                                  * has called ssl_get_new_session, which does not set
 733                                  * sess_cert. */
 734                                 ssl_sess_cert_free(s->session->sess_cert);
 735                         s->session->sess_cert = ssl_sess_cert_new();
 736                         if (s->session->sess_cert == NULL)
 737                                 {
 738                                 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
 739                                 return(-1);
 740                                 }
 741                         }
 742                 /* If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
 743                  * depending on whether it survived in the internal cache
 744                  * or was retrieved from an external cache.
 745                  * If it is NULL, we cannot put any useful data in it anyway,
 746                  * so we don't touch it.
 747                  */
 748
 749 #else /* That's what used to be done when cert_st and sess_cert_st were
 750            * the same. */
 751                 if (!hit)
 752                         {                       /* else add cert to session */
 753                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 754                         if (s->session->sess_cert != NULL)
 755                                 ssl_cert_free(s->session->sess_cert);
 756                         s->session->sess_cert=s->cert;
 757                         }
 758                 else    /* We have a session id-cache hit, if the
 759                          * session-id has no certificate listed against
 760                          * the 'cert' structure, grab the 'old' one
 761                          * listed against the SSL connection */
 762                         {
 763                         if (s->session->sess_cert == NULL)
 764                                 {
 765                                 CRYPTO_add(&s->cert->references,1,
 766                                         CRYPTO_LOCK_SSL_CERT);
 767                                 s->session->sess_cert=s->cert;
 768                                 }
 769                         }
 770 #endif
 771
 772                 if (s->cert == NULL)
 773                         {
 774                         ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 775                         SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
 776                         return(-1);
 777                         }
 778
 779                 if (hit)
 780                         {
 781                         *(p++)=0;               /* no certificate type */
 782                         s2n(s->version,p);      /* version */
 783                         s2n(0,p);               /* cert len */
 784                         s2n(0,p);               /* ciphers len */
 785                         }
 786                 else
 787                         {
 788                         /* EAY EAY */
 789                         /* put certificate type */
 790                         *(p++)=SSL2_CT_X509_CERTIFICATE;
 791                         s2n(s->version,p);      /* version */
 792                         n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 793                         s2n(n,p);               /* certificate length */
 794                         i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
 795                         n=0;
 796
 797                         /* lets send out the ciphers we like in the
 798                          * prefered order */
 799                         sk= s->session->ciphers;
 800                         n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0);
 801                         d+=n;
 802                         s2n(n,p);               /* add cipher length */
 803                         }
 804
 805                 /* make and send conn_id */
 806                 s2n(SSL2_CONNECTION_ID_LENGTH,p);       /* add conn_id length */
 807                 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
 808                 if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0)
 809                         return -1;
 810                 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
 811                 d+=SSL2_CONNECTION_ID_LENGTH;
 812
 813                 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
 814                 s->init_num=d-(unsigned char *)s->init_buf->data;
 815                 s->init_off=0;
 816                 }
 817         /* SSL2_ST_SEND_SERVER_HELLO_B */
 818         /* If we are using TCP/IP, the performance is bad if we do 2
 819          * writes without a read between them.  This occurs when
 820          * Session-id reuse is used, so I will put in a buffering module
 821          */
 822         if (s->hit)
 823                 {
 824                 if (!ssl_init_wbio_buffer(s,1)) return(-1);
 825                 }
 826
 827         return(ssl2_do_write(s));
 828         }
 829
 830 static int get_client_finished(SSL *s)
 831         {
 832         unsigned char *p;
 833         int i, n;
 834         unsigned long len;
 835
 836         p=(unsigned char *)s->init_buf->data;
 837         if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
 838                 {
 839                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 840                 if (i < 1-s->init_num)
 841                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 842                 s->init_num += i;
 843
 844                 if (*p != SSL2_MT_CLIENT_FINISHED)
 845                         {
 846                         if (*p != SSL2_MT_ERROR)
 847                                 {
 848                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 849                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 850                                 }
 851                         else
 852                                 {
 853                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
 854                                 /* try to read the error message */
 855                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
 856                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
 857                                 }
 858                         return(-1);
 859                         }
 860                 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
 861                 }
 862
 863         /* SSL2_ST_GET_CLIENT_FINISHED_B */
 864         if (s->s2->conn_id_length > sizeof s->s2->conn_id)
 865                 {
 866                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 867                 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
 868                 return -1;
 869                 }
 870         len = 1 + (unsigned long)s->s2->conn_id_length;
 871         n = (int)len - s->init_num;
 872         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 873         if (i < n)
 874                 {
 875                 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 876                 }
 877         if (s->msg_callback)
 878                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */
 879         p += 1;
 880         if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0)
 881                 {
 882                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 883                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
 884                 return(-1);
 885                 }
 886         return(1);
 887         }
 888
 889 static int server_verify(SSL *s)
 890         {
 891         unsigned char *p;
 892
 893         if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
 894                 {
 895                 p=(unsigned char *)s->init_buf->data;
 896                 *(p++)=SSL2_MT_SERVER_VERIFY;
 897                 if (s->s2->challenge_length > sizeof s->s2->challenge)
 898                         {
 899                         SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
 900                         return -1;
 901                         }
 902                 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
 903                 /* p+=s->s2->challenge_length; */
 904
 905                 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
 906                 s->init_num=s->s2->challenge_length+1;
 907                 s->init_off=0;
 908                 }
 909         return(ssl2_do_write(s));
 910         }
 911
 912 static int server_finish(SSL *s)
 913         {
 914         unsigned char *p;
 915
 916         if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
 917                 {
 918                 p=(unsigned char *)s->init_buf->data;
 919                 *(p++)=SSL2_MT_SERVER_FINISHED;
 920
 921                 if (s->session->session_id_length > sizeof s->session->session_id)
 922                         {
 923                         SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
 924                         return -1;
 925                         }
 926                 memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length);
 927                 /* p+=s->session->session_id_length; */
 928
 929                 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
 930                 s->init_num=s->session->session_id_length+1;
 931                 s->init_off=0;
 932                 }
 933
 934         /* SSL2_ST_SEND_SERVER_FINISHED_B */
 935         return(ssl2_do_write(s));
 936         }
 937
 938 /* send the request and check the response */
 939 static int request_certificate(SSL *s)
 940         {
 941         const unsigned char *cp;
 942         unsigned char *p,*p2,*buf2;
 943         unsigned char *ccd;
 944         int i,j,ctype,ret= -1;
 945         unsigned long len;
 946         X509 *x509=NULL;
 947         STACK_OF(X509) *sk=NULL;
 948
 949         ccd=s->s2->tmp.ccl;
 950         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
 951                 {
 952                 p=(unsigned char *)s->init_buf->data;
 953                 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
 954                 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
 955                 if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
 956                         return -1;
 957                 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 958
 959                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
 960                 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
 961                 s->init_off=0;
 962                 }
 963
 964         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
 965                 {
 966                 i=ssl2_do_write(s);
 967                 if (i <= 0)
 968                         {
 969                         ret=i;
 970                         goto end;
 971                         }
 972
 973                 s->init_num=0;
 974                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
 975                 }
 976
 977         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
 978                 {
 979                 p=(unsigned char *)s->init_buf->data;
 980                 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */
 981                 if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3
 982                                         * (probably NO-CERTIFICATE-ERROR) */
 983                         {
 984                         ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 985                         goto end;
 986                         }
 987                 s->init_num += i;
 988
 989                 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR))
 990                         {
 991                         n2s(p,i);
 992                         if (i != SSL2_PE_NO_CERTIFICATE)
 993                                 {
 994                                 /* not the error message we expected -- let ssl2_part_read handle it */
 995                                 s->init_num -= 3;
 996                                 ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3);
 997                                 goto end;
 998                                 }
 999
1000                         if (s->msg_callback)
1001                                 s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */
1002
1003                         /* this is the one place where we can recover from an SSL 2.0 error */
1004
1005                         if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
1006                                 {
1007                                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1008                                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1009                                 goto end;
1010                                 }
1011                         ret=1;
1012                         goto end;
1013                         }
1014                 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6))
1015                         {
1016                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
1017                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
1018                         goto end;
1019                         }
1020                 if (s->init_num != 6)
1021                         {
1022                         SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1023                         goto end;
1024                         }
1025
1026                 /* ok we have a response */
1027                 /* certificate type, there is only one right now. */
1028                 ctype= *(p++);
1029                 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
1030                         {
1031                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1032                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
1033                         goto end;
1034                         }
1035                 n2s(p,i); s->s2->tmp.clen=i;
1036                 n2s(p,i); s->s2->tmp.rlen=i;
1037                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1038                 }
1039
1040         /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1041         p=(unsigned char *)s->init_buf->data;
1042         len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1043         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
1044                 {
1045                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG);
1046                 goto end;
1047                 }
1048         j = (int)len - s->init_num;
1049         i = ssl2_read(s,(char *)&(p[s->init_num]),j);
1050         if (i < j)
1051                 {
1052                 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
1053                 goto end;
1054                 }
1055         if (s->msg_callback)
1056                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */
1057         p += 6;
1058
1059         cp = p;
1060         x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen);
1061         if (x509 == NULL)
1062                 {
1063                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
1064                 goto msg_end;
1065                 }
1066
1067         if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
1068                 {
1069                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1070                 goto msg_end;
1071                 }
1072
1073         i=ssl_verify_cert_chain(s,sk);
1074
1075         if (i)  /* we like the packet, now check the chksum */
1076                 {
1077                 EVP_MD_CTX ctx;
1078                 EVP_PKEY *pkey=NULL;
1079
1080                 EVP_MD_CTX_init(&ctx);
1081                 EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL);
1082                 EVP_VerifyUpdate(&ctx,s->s2->key_material,
1083                                  s->s2->key_material_length);
1084                 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
1085
1086                 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
1087                 buf2=OPENSSL_malloc((unsigned int)i);
1088                 if (buf2 == NULL)
1089                         {
1090                         SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1091                         goto msg_end;
1092                         }
1093                 p2=buf2;
1094                 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
1095                 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
1096                 OPENSSL_free(buf2);
1097
1098                 pkey=X509_get_pubkey(x509);
1099                 if (pkey == NULL) goto end;
1100                 i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey);
1101                 EVP_PKEY_free(pkey);
1102                 EVP_MD_CTX_cleanup(&ctx);
1103
1104                 if (i)
1105                         {
1106                         if (s->session->peer != NULL)
1107                                 X509_free(s->session->peer);
1108                         s->session->peer=x509;
1109                         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
1110                         s->session->verify_result = s->verify_result;
1111                         ret=1;
1112                         goto end;
1113                         }
1114                 else
1115                         {
1116                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
1117                         goto msg_end;
1118                         }
1119                 }
1120         else
1121                 {
1122 msg_end:
1123                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1124                 }
1125 end:
1126         sk_X509_free(sk);
1127         X509_free(x509);
1128         return(ret);
1129         }
1130
1131 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1132              unsigned char *to, int padding)
1133         {
1134         RSA *rsa;
1135         int i;
1136
1137         if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
1138                 {
1139                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
1140                 return(-1);
1141                 }
1142         if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
1143                 {
1144                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1145                 return(-1);
1146                 }
1147         rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1148
1149         /* we have the public key */
1150         i=RSA_private_decrypt(len,from,to,rsa,padding);
1151         if (i < 0)
1152                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
1153         return(i);
1154         }
1155 #else /* !OPENSSL_NO_SSL2 */
1156
1157 # if PEDANTIC
1158 static void *dummy=&dummy;
1159 # endif
1160
1161 #endif