crypto/openssl/ssl/s2_srvr.c

   1 /* ssl/s2_srvr.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include "ssl_locl.h"
 113 #ifndef OPENSSL_NO_SSL2
 114 #include <stdio.h>
 115 #include <openssl/bio.h>
 116 #include <openssl/rand.h>
 117 #include <openssl/objects.h>
 118 #include <openssl/evp.h>
 119
 120 static SSL_METHOD *ssl2_get_server_method(int ver);
 121 static int get_client_master_key(SSL *s);
 122 static int get_client_hello(SSL *s);
 123 static int server_hello(SSL *s);
 124 static int get_client_finished(SSL *s);
 125 static int server_verify(SSL *s);
 126 static int server_finish(SSL *s);
 127 static int request_certificate(SSL *s);
 128 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
 129         unsigned char *to,int padding);
 130 #define BREAK   break
 131
 132 static SSL_METHOD *ssl2_get_server_method(int ver)
 133         {
 134         if (ver == SSL2_VERSION)
 135                 return(SSLv2_server_method());
 136         else
 137                 return(NULL);
 138         }
 139
 140 IMPLEMENT_ssl2_meth_func(SSLv2_server_method,
 141                         ssl2_accept,
 142                         ssl_undefined_function,
 143                         ssl2_get_server_method)
 144
 145 int ssl2_accept(SSL *s)
 146         {
 147         unsigned long l=(unsigned long)time(NULL);
 148         BUF_MEM *buf=NULL;
 149         int ret= -1;
 150         long num1;
 151         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 152         int new_state,state;
 153
 154         RAND_add(&l,sizeof(l),0);
 155         ERR_clear_error();
 156         clear_sys_error();
 157
 158         if (s->info_callback != NULL)
 159                 cb=s->info_callback;
 160         else if (s->ctx->info_callback != NULL)
 161                 cb=s->ctx->info_callback;
 162
 163         /* init things to blank */
 164         s->in_handshake++;
 165         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 166
 167         if (s->cert == NULL)
 168                 {
 169                 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 170                 return(-1);
 171                 }
 172
 173         clear_sys_error();
 174         for (;;)
 175                 {
 176                 state=s->state;
 177
 178                 switch (s->state)
 179                         {
 180                 case SSL_ST_BEFORE:
 181                 case SSL_ST_ACCEPT:
 182                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 183                 case SSL_ST_OK|SSL_ST_ACCEPT:
 184
 185                         s->server=1;
 186                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 187
 188                         s->version=SSL2_VERSION;
 189                         s->type=SSL_ST_ACCEPT;
 190
 191                         buf=s->init_buf;
 192                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 193                                 { ret= -1; goto end; }
 194                         if (!BUF_MEM_grow(buf,(int)
 195                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 196                                 { ret= -1; goto end; }
 197                         s->init_buf=buf;
 198                         s->init_num=0;
 199                         s->ctx->stats.sess_accept++;
 200                         s->handshake_func=ssl2_accept;
 201                         s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 202                         BREAK;
 203
 204                 case SSL2_ST_GET_CLIENT_HELLO_A:
 205                 case SSL2_ST_GET_CLIENT_HELLO_B:
 206                 case SSL2_ST_GET_CLIENT_HELLO_C:
 207                         s->shutdown=0;
 208                         ret=get_client_hello(s);
 209                         if (ret <= 0) goto end;
 210                         s->init_num=0;
 211                         s->state=SSL2_ST_SEND_SERVER_HELLO_A;
 212                         BREAK;
 213
 214                 case SSL2_ST_SEND_SERVER_HELLO_A:
 215                 case SSL2_ST_SEND_SERVER_HELLO_B:
 216                         ret=server_hello(s);
 217                         if (ret <= 0) goto end;
 218                         s->init_num=0;
 219                         if (!s->hit)
 220                                 {
 221                                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
 222                                 BREAK;
 223                                 }
 224                         else
 225                                 {
 226                                 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 227                                 BREAK;
 228                                 }
 229                 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
 230                 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
 231                         ret=get_client_master_key(s);
 232                         if (ret <= 0) goto end;
 233                         s->init_num=0;
 234                         s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 235                         BREAK;
 236
 237                 case SSL2_ST_SERVER_START_ENCRYPTION:
 238                         /* Ok we how have sent all the stuff needed to
 239                          * start encrypting, the next packet back will
 240                          * be encrypted. */
 241                         if (!ssl2_enc_init(s,0))
 242                                 { ret= -1; goto end; }
 243                         s->s2->clear_text=0;
 244                         s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
 245                         BREAK;
 246
 247                 case SSL2_ST_SEND_SERVER_VERIFY_A:
 248                 case SSL2_ST_SEND_SERVER_VERIFY_B:
 249                         ret=server_verify(s);
 250                         if (ret <= 0) goto end;
 251                         s->init_num=0;
 252                         if (s->hit)
 253                                 {
 254                                 /* If we are in here, we have been
 255                                  * buffering the output, so we need to
 256                                  * flush it and remove buffering from
 257                                  * future traffic */
 258                                 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
 259                                 BREAK;
 260                                 }
 261                         else
 262                                 {
 263                                 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 264                                 break;
 265                                 }
 266
 267                 case SSL2_ST_SEND_SERVER_VERIFY_C:
 268                         /* get the number of bytes to write */
 269                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 270                         if (num1 > 0)
 271                                 {
 272                                 s->rwstate=SSL_WRITING;
 273                                 num1=BIO_flush(s->wbio);
 274                                 if (num1 <= 0) { ret= -1; goto end; }
 275                                 s->rwstate=SSL_NOTHING;
 276                                 }
 277
 278                         /* flushed and now remove buffering */
 279                         s->wbio=BIO_pop(s->wbio);
 280
 281                         s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 282                         BREAK;
 283
 284                 case SSL2_ST_GET_CLIENT_FINISHED_A:
 285                 case SSL2_ST_GET_CLIENT_FINISHED_B:
 286                         ret=get_client_finished(s);
 287                         if (ret <= 0)
 288                                 goto end;
 289                         s->init_num=0;
 290                         s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
 291                         BREAK;
 292
 293                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
 294                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
 295                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
 296                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
 297                         /* don't do a 'request certificate' if we
 298                          * don't want to, or we already have one, and
 299                          * we only want to do it once. */
 300                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 301                                 ((s->session->peer != NULL) &&
 302                                 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 303                                 {
 304                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 305                                 break;
 306                                 }
 307                         else
 308                                 {
 309                                 ret=request_certificate(s);
 310                                 if (ret <= 0) goto end;
 311                                 s->init_num=0;
 312                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 313                                 }
 314                         BREAK;
 315
 316                 case SSL2_ST_SEND_SERVER_FINISHED_A:
 317                 case SSL2_ST_SEND_SERVER_FINISHED_B:
 318                         ret=server_finish(s);
 319                         if (ret <= 0) goto end;
 320                         s->init_num=0;
 321                         s->state=SSL_ST_OK;
 322                         break;
 323
 324                 case SSL_ST_OK:
 325                         BUF_MEM_free(s->init_buf);
 326                         ssl_free_wbio_buffer(s);
 327                         s->init_buf=NULL;
 328                         s->init_num=0;
 329                 /*      ERR_clear_error();*/
 330
 331                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 332
 333                         s->ctx->stats.sess_accept_good++;
 334                         /* s->server=1; */
 335                         ret=1;
 336
 337                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 338
 339                         goto end;
 340                         /* BREAK; */
 341
 342                 default:
 343                         SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
 344                         ret= -1;
 345                         goto end;
 346                         /* BREAK; */
 347                         }
 348
 349                 if ((cb != NULL) && (s->state != state))
 350                         {
 351                         new_state=s->state;
 352                         s->state=state;
 353                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 354                         s->state=new_state;
 355                         }
 356                 }
 357 end:
 358         s->in_handshake--;
 359         if (cb != NULL)
 360                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 361         return(ret);
 362         }
 363
 364 static int get_client_master_key(SSL *s)
 365         {
 366         int is_export,i,n,keya,ek;
 367         unsigned long len;
 368         unsigned char *p;
 369         SSL_CIPHER *cp;
 370         const EVP_CIPHER *c;
 371         const EVP_MD *md;
 372
 373         p=(unsigned char *)s->init_buf->data;
 374         if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
 375                 {
 376                 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
 377
 378                 if (i < (10-s->init_num))
 379                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 380                 s->init_num = 10;
 381
 382                 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
 383                         {
 384                         if (p[-1] != SSL2_MT_ERROR)
 385                                 {
 386                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 387                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
 388                                 }
 389                         else
 390                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
 391                         return(-1);
 392                         }
 393
 394                 cp=ssl2_get_cipher_by_char(p);
 395                 if (cp == NULL || sk_SSL_CIPHER_find(s->session->ciphers, cp) < 0)
 396                         {
 397                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 398                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
 399                         return(-1);
 400                         }
 401                 s->session->cipher= cp;
 402
 403                 p+=3;
 404                 n2s(p,i); s->s2->tmp.clear=i;
 405                 n2s(p,i); s->s2->tmp.enc=i;
 406                 n2s(p,i);
 407                 if(i > SSL_MAX_KEY_ARG_LENGTH)
 408                         {
 409                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 410                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
 411                         return -1;
 412                         }
 413                 s->session->key_arg_length=i;
 414                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
 415                 }
 416
 417         /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
 418         p=(unsigned char *)s->init_buf->data;
 419         if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 420                 {
 421                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 422                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
 423                 return -1;
 424                 }
 425         keya=s->session->key_arg_length;
 426         len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + (unsigned long)keya;
 427         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 428                 {
 429                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 430                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG);
 431                 return -1;
 432                 }
 433         n = (int)len - s->init_num;
 434         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 435         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 436         if (s->msg_callback)
 437                 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */
 438         p += 10;
 439
 440         memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
 441                 (unsigned int)keya);
 442
 443         if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
 444                 {
 445                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 446                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
 447                 return(-1);
 448                 }
 449
 450         is_export=SSL_C_IS_EXPORT(s->session->cipher);
 451
 452         if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
 453                 {
 454                 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 455                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 456                 return(0);
 457                 }
 458
 459         if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 460                 {
 461                 is_export=1;
 462                 ek=8;
 463                 }
 464         else
 465                 ek=5;
 466
 467         /*
 468          * The format of the CLIENT-MASTER-KEY message is
 469          * 1 byte message type
 470          * 3 bytes cipher
 471          * 2-byte clear key length (stored in s->s2->tmp.clear)
 472          * 2-byte encrypted key length (stored in s->s2->tmp.enc)
 473          * 2-byte key args length (IV etc)
 474          * clear key
 475          * encrypted key
 476          * key args
 477          *
 478          * If the cipher is an export cipher, then the encrypted key bytes
 479          * are a fixed portion of the total key (5 or 8 bytes). The size of
 480          * this portion is in |ek|. If the cipher is not an export cipher,
 481          * then the entire key material is encrypted (i.e., clear key length
 482          * must be zero).
 483          */
 484         if ((!is_export && s->s2->tmp.clear != 0) ||
 485             (is_export && s->s2->tmp.clear + ek != EVP_CIPHER_key_length(c))) {
 486                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
 487                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_LENGTH);
 488                 return -1;
 489         }
 490         /*
 491          * The encrypted blob must decrypt to the encrypted portion of the key.
 492          * Decryption can't be expanding, so if we don't have enough encrypted
 493          * bytes to fit the key in the buffer, stop now.
 494          */
 495         if ((is_export && s->s2->tmp.enc < ek) ||
 496             (!is_export && s->s2->tmp.enc < EVP_CIPHER_key_length(c))) {
 497                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 498                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_LENGTH_TOO_SHORT);
 499                 return -1;
 500         }
 501
 502         i = ssl_rsa_private_decrypt(s->cert, s->s2->tmp.enc,
 503                                 &(p[s->s2->tmp.clear]),
 504                                 &(p[s->s2->tmp.clear]),
 505                                 (s->s2->ssl2_rollback) ? RSA_SSLV23_PADDING :
 506                                 RSA_PKCS1_PADDING);
 507
 508         /* bad decrypt */
 509 #if 1
 510         /* If a bad decrypt, continue with protocol but with a
 511          * random master secret (Bleichenbacher attack) */
 512         if ((i < 0) || ((!is_export && i != EVP_CIPHER_key_length(c))
 513                     || (is_export && i != ek))) {
 514                 ERR_clear_error();
 515                 if (is_export)
 516                         i=ek;
 517                 else
 518                         i=EVP_CIPHER_key_length(c);
 519                 if (RAND_pseudo_bytes(&p[s->s2->tmp.clear], i) <= 0)
 520                         return 0;
 521         }
 522 #else
 523         if (i < 0)
 524                 {
 525                 error=1;
 526                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
 527                 }
 528         /* incorrect number of key bytes for non export cipher */
 529         else if ((!is_export && (i != EVP_CIPHER_key_length(c)))
 530                 || (is_export && ((i != ek) || (s->s2->tmp.clear+i !=
 531                         EVP_CIPHER_key_length(c)))))
 532                 {
 533                 error=1;
 534                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
 535                 }
 536         if (error)
 537                 {
 538                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 539                 return(-1);
 540                 }
 541 #endif
 542
 543         if (is_export)
 544                 i = EVP_CIPHER_key_length(c);
 545
 546         if (i > SSL_MAX_MASTER_KEY_LENGTH)
 547                 {
 548                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 549                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
 550                 return -1;
 551                 }
 552         s->session->master_key_length=i;
 553         memcpy(s->session->master_key,p,(unsigned int)i);
 554         return(1);
 555         }
 556
 557 static int get_client_hello(SSL *s)
 558         {
 559         int i,n;
 560         unsigned long len;
 561         unsigned char *p;
 562         STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
 563         STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
 564         STACK_OF(SSL_CIPHER) *prio, *allow;
 565         int z;
 566
 567         /* This is a bit of a hack to check for the correct packet
 568          * type the first time round. */
 569         if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
 570                 {
 571                 s->first_packet=1;
 572                 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
 573                 }
 574
 575         p=(unsigned char *)s->init_buf->data;
 576         if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
 577                 {
 578                 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
 579                 if (i < (9-s->init_num))
 580                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 581                 s->init_num = 9;
 582
 583                 if (*(p++) != SSL2_MT_CLIENT_HELLO)
 584                         {
 585                         if (p[-1] != SSL2_MT_ERROR)
 586                                 {
 587                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 588                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
 589                                 }
 590                         else
 591                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
 592                         return(-1);
 593                         }
 594                 n2s(p,i);
 595                 if (i < s->version) s->version=i;
 596                 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
 597                 n2s(p,i); s->s2->tmp.session_id_length=i;
 598                 n2s(p,i); s->s2->challenge_length=i;
 599                 if (    (i < SSL2_MIN_CHALLENGE_LENGTH) ||
 600                         (i > SSL2_MAX_CHALLENGE_LENGTH))
 601                         {
 602                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 603                         SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
 604                         return(-1);
 605                         }
 606                 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
 607                 }
 608
 609         /* SSL2_ST_GET_CLIENT_HELLO_C */
 610         p=(unsigned char *)s->init_buf->data;
 611         len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length;
 612         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 613                 {
 614                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 615                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG);
 616                 return -1;
 617                 }
 618         n = (int)len - s->init_num;
 619         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 620         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 621         if (s->msg_callback)
 622                 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */
 623         p += 9;
 624
 625         /* get session-id before cipher stuff so we can get out session
 626          * structure if it is cached */
 627         /* session-id */
 628         if ((s->s2->tmp.session_id_length != 0) &&
 629                 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
 630                 {
 631                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 632                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
 633                 return(-1);
 634                 }
 635
 636         if (s->s2->tmp.session_id_length == 0)
 637                 {
 638                 if (!ssl_get_new_session(s,1))
 639                         {
 640                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 641                         return(-1);
 642                         }
 643                 }
 644         else
 645                 {
 646                 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
 647                         s->s2->tmp.session_id_length, NULL);
 648                 if (i == 1)
 649                         { /* previous session */
 650                         s->hit=1;
 651                         }
 652                 else if (i == -1)
 653                         {
 654                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 655                         return(-1);
 656                         }
 657                 else
 658                         {
 659                         if (s->cert == NULL)
 660                                 {
 661                                 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 662                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
 663                                 return(-1);
 664                                 }
 665
 666                         if (!ssl_get_new_session(s,1))
 667                                 {
 668                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 669                                 return(-1);
 670                                 }
 671                         }
 672                 }
 673
 674         if (!s->hit)
 675                 {
 676                 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
 677                         &s->session->ciphers);
 678                 if (cs == NULL) goto mem_err;
 679
 680                 cl=SSL_get_ciphers(s);
 681
 682                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
 683                     {
 684                     prio=sk_SSL_CIPHER_dup(cl);
 685                     if (prio == NULL) goto mem_err;
 686                     allow = cs;
 687                     }
 688                 else
 689                     {
 690                     prio = cs;
 691                     allow = cl;
 692                     }
 693                 /* Generate list of SSLv2 ciphers shared between client and server */
 694                 for (z = 0; z < sk_SSL_CIPHER_num(prio); z++)
 695                         {
 696                         const SSL_CIPHER *cp = sk_SSL_CIPHER_value(prio, z);
 697                         if ((cp->algorithms & SSL_SSLV2) == 0 ||
 698                             sk_SSL_CIPHER_find(allow, cp) < 0)
 699                                 {
 700                                 (void)sk_SSL_CIPHER_delete(prio,z);
 701                                 z--;
 702                                 }
 703                         }
 704                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
 705                     {
 706                     sk_SSL_CIPHER_free(s->session->ciphers);
 707                     s->session->ciphers = prio;
 708                     }
 709
 710                 /* Make sure we have at least one cipher in common */
 711                 if (sk_SSL_CIPHER_num(s->session->ciphers) == 0)
 712                         {
 713                         ssl2_return_error(s, SSL2_PE_NO_CIPHER);
 714                         SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_NO_CIPHER_MATCH);
 715                         return -1;
 716                         }
 717                 /* s->session->ciphers should now have a list of
 718                  * ciphers that are on both the client and server.
 719                  * This list is ordered by the order the client sent
 720                  * the ciphers or in the order of the server's preference
 721                  * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
 722                  */
 723                 }
 724         p+=s->s2->tmp.cipher_spec_length;
 725         /* done cipher selection */
 726
 727         /* session id extracted already */
 728         p+=s->s2->tmp.session_id_length;
 729
 730         /* challenge */
 731         if (s->s2->challenge_length > sizeof s->s2->challenge)
 732                 {
 733                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 734                 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 735                 return -1;
 736                 }
 737         memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
 738         return(1);
 739 mem_err:
 740         SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 741         return(0);
 742         }
 743
 744 static int server_hello(SSL *s)
 745         {
 746         unsigned char *p,*d;
 747         int n,hit;
 748
 749         p=(unsigned char *)s->init_buf->data;
 750         if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
 751                 {
 752                 d=p+11;
 753                 *(p++)=SSL2_MT_SERVER_HELLO;            /* type */
 754                 hit=s->hit;
 755                 *(p++)=(unsigned char)hit;
 756 #if 1
 757                 if (!hit)
 758                         {
 759                         if (s->session->sess_cert != NULL)
 760                                 /* This can't really happen because get_client_hello
 761                                  * has called ssl_get_new_session, which does not set
 762                                  * sess_cert. */
 763                                 ssl_sess_cert_free(s->session->sess_cert);
 764                         s->session->sess_cert = ssl_sess_cert_new();
 765                         if (s->session->sess_cert == NULL)
 766                                 {
 767                                 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
 768                                 return(-1);
 769                                 }
 770                         }
 771                 /* If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
 772                  * depending on whether it survived in the internal cache
 773                  * or was retrieved from an external cache.
 774                  * If it is NULL, we cannot put any useful data in it anyway,
 775                  * so we don't touch it.
 776                  */
 777
 778 #else /* That's what used to be done when cert_st and sess_cert_st were
 779            * the same. */
 780                 if (!hit)
 781                         {                       /* else add cert to session */
 782                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 783                         if (s->session->sess_cert != NULL)
 784                                 ssl_cert_free(s->session->sess_cert);
 785                         s->session->sess_cert=s->cert;
 786                         }
 787                 else    /* We have a session id-cache hit, if the
 788                          * session-id has no certificate listed against
 789                          * the 'cert' structure, grab the 'old' one
 790                          * listed against the SSL connection */
 791                         {
 792                         if (s->session->sess_cert == NULL)
 793                                 {
 794                                 CRYPTO_add(&s->cert->references,1,
 795                                         CRYPTO_LOCK_SSL_CERT);
 796                                 s->session->sess_cert=s->cert;
 797                                 }
 798                         }
 799 #endif
 800
 801                 if (s->cert == NULL)
 802                         {
 803                         ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 804                         SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
 805                         return(-1);
 806                         }
 807
 808                 if (hit)
 809                         {
 810                         *(p++)=0;               /* no certificate type */
 811                         s2n(s->version,p);      /* version */
 812                         s2n(0,p);               /* cert len */
 813                         s2n(0,p);               /* ciphers len */
 814                         }
 815                 else
 816                         {
 817                         /* EAY EAY */
 818                         /* put certificate type */
 819                         *(p++)=SSL2_CT_X509_CERTIFICATE;
 820                         s2n(s->version,p);      /* version */
 821                         n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 822                         s2n(n,p);               /* certificate length */
 823                         i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
 824                         n=0;
 825
 826                         /* lets send out the ciphers we like in the
 827                          * prefered order */
 828                         n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0);
 829                         d+=n;
 830                         s2n(n,p);               /* add cipher length */
 831                         }
 832
 833                 /* make and send conn_id */
 834                 s2n(SSL2_CONNECTION_ID_LENGTH,p);       /* add conn_id length */
 835                 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
 836                 if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0)
 837                         return -1;
 838                 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
 839                 d+=SSL2_CONNECTION_ID_LENGTH;
 840
 841                 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
 842                 s->init_num=d-(unsigned char *)s->init_buf->data;
 843                 s->init_off=0;
 844                 }
 845         /* SSL2_ST_SEND_SERVER_HELLO_B */
 846         /* If we are using TCP/IP, the performance is bad if we do 2
 847          * writes without a read between them.  This occurs when
 848          * Session-id reuse is used, so I will put in a buffering module
 849          */
 850         if (s->hit)
 851                 {
 852                 if (!ssl_init_wbio_buffer(s,1)) return(-1);
 853                 }
 854
 855         return(ssl2_do_write(s));
 856         }
 857
 858 static int get_client_finished(SSL *s)
 859         {
 860         unsigned char *p;
 861         int i, n;
 862         unsigned long len;
 863
 864         p=(unsigned char *)s->init_buf->data;
 865         if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
 866                 {
 867                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 868                 if (i < 1-s->init_num)
 869                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 870                 s->init_num += i;
 871
 872                 if (*p != SSL2_MT_CLIENT_FINISHED)
 873                         {
 874                         if (*p != SSL2_MT_ERROR)
 875                                 {
 876                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 877                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 878                                 }
 879                         else
 880                                 {
 881                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
 882                                 /* try to read the error message */
 883                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
 884                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
 885                                 }
 886                         return(-1);
 887                         }
 888                 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
 889                 }
 890
 891         /* SSL2_ST_GET_CLIENT_FINISHED_B */
 892         if (s->s2->conn_id_length > sizeof s->s2->conn_id)
 893                 {
 894                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 895                 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
 896                 return -1;
 897                 }
 898         len = 1 + (unsigned long)s->s2->conn_id_length;
 899         n = (int)len - s->init_num;
 900         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 901         if (i < n)
 902                 {
 903                 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 904                 }
 905         if (s->msg_callback)
 906                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */
 907         p += 1;
 908         if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0)
 909                 {
 910                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 911                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
 912                 return(-1);
 913                 }
 914         return(1);
 915         }
 916
 917 static int server_verify(SSL *s)
 918         {
 919         unsigned char *p;
 920
 921         if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
 922                 {
 923                 p=(unsigned char *)s->init_buf->data;
 924                 *(p++)=SSL2_MT_SERVER_VERIFY;
 925                 if (s->s2->challenge_length > sizeof s->s2->challenge)
 926                         {
 927                         SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
 928                         return -1;
 929                         }
 930                 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
 931                 /* p+=s->s2->challenge_length; */
 932
 933                 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
 934                 s->init_num=s->s2->challenge_length+1;
 935                 s->init_off=0;
 936                 }
 937         return(ssl2_do_write(s));
 938         }
 939
 940 static int server_finish(SSL *s)
 941         {
 942         unsigned char *p;
 943
 944         if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
 945                 {
 946                 p=(unsigned char *)s->init_buf->data;
 947                 *(p++)=SSL2_MT_SERVER_FINISHED;
 948
 949                 if (s->session->session_id_length > sizeof s->session->session_id)
 950                         {
 951                         SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
 952                         return -1;
 953                         }
 954                 memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length);
 955                 /* p+=s->session->session_id_length; */
 956
 957                 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
 958                 s->init_num=s->session->session_id_length+1;
 959                 s->init_off=0;
 960                 }
 961
 962         /* SSL2_ST_SEND_SERVER_FINISHED_B */
 963         return(ssl2_do_write(s));
 964         }
 965
 966 /* send the request and check the response */
 967 static int request_certificate(SSL *s)
 968         {
 969         const unsigned char *cp;
 970         unsigned char *p,*p2,*buf2;
 971         unsigned char *ccd;
 972         int i,j,ctype,ret= -1;
 973         unsigned long len;
 974         X509 *x509=NULL;
 975         STACK_OF(X509) *sk=NULL;
 976
 977         ccd=s->s2->tmp.ccl;
 978         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
 979                 {
 980                 p=(unsigned char *)s->init_buf->data;
 981                 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
 982                 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
 983                 if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
 984                         return -1;
 985                 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 986
 987                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
 988                 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
 989                 s->init_off=0;
 990                 }
 991
 992         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
 993                 {
 994                 i=ssl2_do_write(s);
 995                 if (i <= 0)
 996                         {
 997                         ret=i;
 998                         goto end;
 999                         }
1000
1001                 s->init_num=0;
1002                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
1003                 }
1004
1005         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
1006                 {
1007                 p=(unsigned char *)s->init_buf->data;
1008                 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */
1009                 if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3
1010                                         * (probably NO-CERTIFICATE-ERROR) */
1011                         {
1012                         ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
1013                         goto end;
1014                         }
1015                 s->init_num += i;
1016
1017                 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR))
1018                         {
1019                         n2s(p,i);
1020                         if (i != SSL2_PE_NO_CERTIFICATE)
1021                                 {
1022                                 /* not the error message we expected -- let ssl2_part_read handle it */
1023                                 s->init_num -= 3;
1024                                 ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3);
1025                                 goto end;
1026                                 }
1027
1028                         if (s->msg_callback)
1029                                 s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */
1030
1031                         /* this is the one place where we can recover from an SSL 2.0 error */
1032
1033                         if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
1034                                 {
1035                                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1036                                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1037                                 goto end;
1038                                 }
1039                         ret=1;
1040                         goto end;
1041                         }
1042                 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6))
1043                         {
1044                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
1045                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
1046                         goto end;
1047                         }
1048                 if (s->init_num != 6)
1049                         {
1050                         SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1051                         goto end;
1052                         }
1053
1054                 /* ok we have a response */
1055                 /* certificate type, there is only one right now. */
1056                 ctype= *(p++);
1057                 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
1058                         {
1059                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1060                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
1061                         goto end;
1062                         }
1063                 n2s(p,i); s->s2->tmp.clen=i;
1064                 n2s(p,i); s->s2->tmp.rlen=i;
1065                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1066                 }
1067
1068         /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1069         p=(unsigned char *)s->init_buf->data;
1070         len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1071         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
1072                 {
1073                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG);
1074                 goto end;
1075                 }
1076         j = (int)len - s->init_num;
1077         i = ssl2_read(s,(char *)&(p[s->init_num]),j);
1078         if (i < j)
1079                 {
1080                 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
1081                 goto end;
1082                 }
1083         if (s->msg_callback)
1084                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */
1085         p += 6;
1086
1087         cp = p;
1088         x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen);
1089         if (x509 == NULL)
1090                 {
1091                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
1092                 goto msg_end;
1093                 }
1094
1095         if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
1096                 {
1097                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1098                 goto msg_end;
1099                 }
1100
1101         i=ssl_verify_cert_chain(s,sk);
1102
1103         if (i > 0)      /* we like the packet, now check the chksum */
1104                 {
1105                 EVP_MD_CTX ctx;
1106                 EVP_PKEY *pkey=NULL;
1107
1108                 EVP_MD_CTX_init(&ctx);
1109                 EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL);
1110                 EVP_VerifyUpdate(&ctx,s->s2->key_material,
1111                                  s->s2->key_material_length);
1112                 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
1113
1114                 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
1115                 buf2=OPENSSL_malloc((unsigned int)i);
1116                 if (buf2 == NULL)
1117                         {
1118                         SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1119                         goto msg_end;
1120                         }
1121                 p2=buf2;
1122                 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
1123                 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
1124                 OPENSSL_free(buf2);
1125
1126                 pkey=X509_get_pubkey(x509);
1127                 if (pkey == NULL) goto end;
1128                 i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey);
1129                 EVP_PKEY_free(pkey);
1130                 EVP_MD_CTX_cleanup(&ctx);
1131
1132                 if (i > 0)
1133                         {
1134                         if (s->session->peer != NULL)
1135                                 X509_free(s->session->peer);
1136                         s->session->peer=x509;
1137                         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
1138                         s->session->verify_result = s->verify_result;
1139                         ret=1;
1140                         goto end;
1141                         }
1142                 else
1143                         {
1144                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
1145                         goto msg_end;
1146                         }
1147                 }
1148         else
1149                 {
1150 msg_end:
1151                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1152                 }
1153 end:
1154         sk_X509_free(sk);
1155         X509_free(x509);
1156         return(ret);
1157         }
1158
1159 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1160              unsigned char *to, int padding)
1161         {
1162         RSA *rsa;
1163         int i;
1164
1165         if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
1166                 {
1167                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
1168                 return(-1);
1169                 }
1170         if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
1171                 {
1172                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1173                 return(-1);
1174                 }
1175         rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1176
1177         /* we have the public key */
1178         i=RSA_private_decrypt(len,from,to,rsa,padding);
1179         if (i < 0)
1180                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
1181         return(i);
1182         }
1183 #else /* !OPENSSL_NO_SSL2 */
1184
1185 # if PEDANTIC
1186 static void *dummy=&dummy;
1187 # endif
1188
1189 #endif