ssl/s2_srvr.c

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