ssl/s2_srvr.c

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