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 const SSL_METHOD *ssl2_get_server_method(int ver);
 121 static int get_client_master_key(SSL *s);
 122 static int get_client_hello(SSL *s);
 123 static int server_hello(SSL *s);
 124 static int get_client_finished(SSL *s);
 125 static int server_verify(SSL *s);
 126 static int server_finish(SSL *s);
 127 static int request_certificate(SSL *s);
 128 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
 129         unsigned char *to,int padding);
 130 #define BREAK   break
 131
 132 static const SSL_METHOD *ssl2_get_server_method(int ver)
 133         {
 134         if (ver == SSL2_VERSION)
 135                 return(SSLv2_server_method());
 136         else
 137                 return(NULL);
 138         }
 139
 140 IMPLEMENT_ssl2_meth_func(SSLv2_server_method,
 141                         ssl2_accept,
 142                         ssl_undefined_function,
 143                         ssl2_get_server_method)
 144
 145 int ssl2_accept(SSL *s)
 146         {
 147         unsigned long l=(unsigned long)time(NULL);
 148         BUF_MEM *buf=NULL;
 149         int ret= -1;
 150         long num1;
 151         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 152         int new_state,state;
 153
 154         RAND_add(&l,sizeof(l),0);
 155         ERR_clear_error();
 156         clear_sys_error();
 157
 158         if (s->info_callback != NULL)
 159                 cb=s->info_callback;
 160         else if (s->ctx->info_callback != NULL)
 161                 cb=s->ctx->info_callback;
 162
 163         /* init things to blank */
 164         s->in_handshake++;
 165         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 166
 167         if (s->cert == NULL)
 168                 {
 169                 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 170                 return(-1);
 171                 }
 172
 173         clear_sys_error();
 174         for (;;)
 175                 {
 176                 state=s->state;
 177
 178                 switch (s->state)
 179                         {
 180                 case SSL_ST_BEFORE:
 181                 case SSL_ST_ACCEPT:
 182                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 183                 case SSL_ST_OK|SSL_ST_ACCEPT:
 184
 185                         s->server=1;
 186                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 187
 188                         s->version=SSL2_VERSION;
 189                         s->type=SSL_ST_ACCEPT;
 190
 191                         if(s->init_buf == NULL)
 192                                 {
 193                                 if ((buf=BUF_MEM_new()) == NULL)
 194                                         {
 195                                         ret= -1;
 196                                         goto end;
 197                                         }
 198                                 if (!BUF_MEM_grow(buf,(int) SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 199                                         {
 200                                         BUF_MEM_free(buf);
 201                                         ret= -1;
 202                                         goto end;
 203                                         }
 204                                 s->init_buf=buf;
 205                                 }
 206                         s->init_num=0;
 207                         s->ctx->stats.sess_accept++;
 208                         s->handshake_func=ssl2_accept;
 209                         s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 210                         BREAK;
 211
 212                 case SSL2_ST_GET_CLIENT_HELLO_A:
 213                 case SSL2_ST_GET_CLIENT_HELLO_B:
 214                 case SSL2_ST_GET_CLIENT_HELLO_C:
 215                         s->shutdown=0;
 216                         ret=get_client_hello(s);
 217                         if (ret <= 0) goto end;
 218                         s->init_num=0;
 219                         s->state=SSL2_ST_SEND_SERVER_HELLO_A;
 220                         BREAK;
 221
 222                 case SSL2_ST_SEND_SERVER_HELLO_A:
 223                 case SSL2_ST_SEND_SERVER_HELLO_B:
 224                         ret=server_hello(s);
 225                         if (ret <= 0) goto end;
 226                         s->init_num=0;
 227                         if (!s->hit)
 228                                 {
 229                                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
 230                                 BREAK;
 231                                 }
 232                         else
 233                                 {
 234                                 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 235                                 BREAK;
 236                                 }
 237                 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
 238                 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
 239                         ret=get_client_master_key(s);
 240                         if (ret <= 0) goto end;
 241                         s->init_num=0;
 242                         s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 243                         BREAK;
 244
 245                 case SSL2_ST_SERVER_START_ENCRYPTION:
 246                         /* Ok we how have sent all the stuff needed to
 247                          * start encrypting, the next packet back will
 248                          * be encrypted. */
 249                         if (!ssl2_enc_init(s,0))
 250                                 { ret= -1; goto end; }
 251                         s->s2->clear_text=0;
 252                         s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
 253                         BREAK;
 254
 255                 case SSL2_ST_SEND_SERVER_VERIFY_A:
 256                 case SSL2_ST_SEND_SERVER_VERIFY_B:
 257                         ret=server_verify(s);
 258                         if (ret <= 0) goto end;
 259                         s->init_num=0;
 260                         if (s->hit)
 261                                 {
 262                                 /* If we are in here, we have been
 263                                  * buffering the output, so we need to
 264                                  * flush it and remove buffering from
 265                                  * future traffic */
 266                                 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
 267                                 BREAK;
 268                                 }
 269                         else
 270                                 {
 271                                 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 272                                 break;
 273                                 }
 274
 275                 case SSL2_ST_SEND_SERVER_VERIFY_C:
 276                         /* get the number of bytes to write */
 277                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 278                         if (num1 > 0)
 279                                 {
 280                                 s->rwstate=SSL_WRITING;
 281                                 num1=BIO_flush(s->wbio);
 282                                 if (num1 <= 0) { ret= -1; goto end; }
 283                                 s->rwstate=SSL_NOTHING;
 284                                 }
 285
 286                         /* flushed and now remove buffering */
 287                         s->wbio=BIO_pop(s->wbio);
 288
 289                         s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 290                         BREAK;
 291
 292                 case SSL2_ST_GET_CLIENT_FINISHED_A:
 293                 case SSL2_ST_GET_CLIENT_FINISHED_B:
 294                         ret=get_client_finished(s);
 295                         if (ret <= 0)
 296                                 goto end;
 297                         s->init_num=0;
 298                         s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
 299                         BREAK;
 300
 301                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
 302                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
 303                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
 304                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
 305                         /* don't do a 'request certificate' if we
 306                          * don't want to, or we already have one, and
 307                          * we only want to do it once. */
 308                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 309                                 ((s->session->peer != NULL) &&
 310                                 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 311                                 {
 312                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 313                                 break;
 314                                 }
 315                         else
 316                                 {
 317                                 ret=request_certificate(s);
 318                                 if (ret <= 0) goto end;
 319                                 s->init_num=0;
 320                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 321                                 }
 322                         BREAK;
 323
 324                 case SSL2_ST_SEND_SERVER_FINISHED_A:
 325                 case SSL2_ST_SEND_SERVER_FINISHED_B:
 326                         ret=server_finish(s);
 327                         if (ret <= 0) goto end;
 328                         s->init_num=0;
 329                         s->state=SSL_ST_OK;
 330                         break;
 331
 332                 case SSL_ST_OK:
 333                         BUF_MEM_free(s->init_buf);
 334                         ssl_free_wbio_buffer(s);
 335                         s->init_buf=NULL;
 336                         s->init_num=0;
 337                 /*      ERR_clear_error();*/
 338
 339                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 340
 341                         s->ctx->stats.sess_accept_good++;
 342                         /* s->server=1; */
 343                         ret=1;
 344
 345                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 346
 347                         goto end;
 348                         /* BREAK; */
 349
 350                 default:
 351                         SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
 352                         ret= -1;
 353                         goto end;
 354                         /* BREAK; */
 355                         }
 356
 357                 if ((cb != NULL) && (s->state != state))
 358                         {
 359                         new_state=s->state;
 360                         s->state=state;
 361                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 362                         s->state=new_state;
 363                         }
 364                 }
 365 end:
 366         s->in_handshake--;
 367         if (cb != NULL)
 368                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 369         return(ret);
 370         }
 371
 372 static int get_client_master_key(SSL *s)
 373         {
 374         int is_export,i,n,keya,ek;
 375         unsigned long len;
 376         unsigned char *p;
 377         const SSL_CIPHER *cp;
 378         const EVP_CIPHER *c;
 379         const EVP_MD *md;
 380
 381         p=(unsigned char *)s->init_buf->data;
 382         if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
 383                 {
 384                 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
 385
 386                 if (i < (10-s->init_num))
 387                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 388                 s->init_num = 10;
 389
 390                 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
 391                         {
 392                         if (p[-1] != SSL2_MT_ERROR)
 393                                 {
 394                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 395                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
 396                                 }
 397                         else
 398                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
 399                         return(-1);
 400                         }
 401
 402                 cp=ssl2_get_cipher_by_char(p);
 403                 if (cp == NULL || sk_SSL_CIPHER_find(s->session->ciphers, cp) < 0)
 404                         {
 405                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 406                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
 407                         return(-1);
 408                         }
 409                 s->session->cipher= cp;
 410
 411                 p+=3;
 412                 n2s(p,i); s->s2->tmp.clear=i;
 413                 n2s(p,i); s->s2->tmp.enc=i;
 414                 n2s(p,i);
 415                 if(i > SSL_MAX_KEY_ARG_LENGTH)
 416                         {
 417                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 418                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
 419                         return -1;
 420                         }
 421                 s->session->key_arg_length=i;
 422                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
 423                 }
 424
 425         /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
 426         p=(unsigned char *)s->init_buf->data;
 427         if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 428                 {
 429                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 430                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
 431                 return -1;
 432                 }
 433         keya=s->session->key_arg_length;
 434         len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + (unsigned long)keya;
 435         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 436                 {
 437                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 438                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG);
 439                 return -1;
 440                 }
 441         n = (int)len - s->init_num;
 442         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 443         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 444         if (s->msg_callback)
 445                 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */
 446         p += 10;
 447
 448         memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
 449                 (unsigned int)keya);
 450
 451         if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
 452                 {
 453                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 454                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
 455                 return(-1);
 456                 }
 457
 458         is_export=SSL_C_IS_EXPORT(s->session->cipher);
 459
 460         if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL))
 461                 {
 462                 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 463                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 464                 return(0);
 465                 }
 466
 467         if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 468                 {
 469                 is_export=1;
 470                 ek=8;
 471                 }
 472         else
 473                 ek=5;
 474
 475         /*
 476          * The format of the CLIENT-MASTER-KEY message is
 477          * 1 byte message type
 478          * 3 bytes cipher
 479          * 2-byte clear key length (stored in s->s2->tmp.clear)
 480          * 2-byte encrypted key length (stored in s->s2->tmp.enc)
 481          * 2-byte key args length (IV etc)
 482          * clear key
 483          * encrypted key
 484          * key args
 485          *
 486          * If the cipher is an export cipher, then the encrypted key bytes
 487          * are a fixed portion of the total key (5 or 8 bytes). The size of
 488          * this portion is in |ek|. If the cipher is not an export cipher,
 489          * then the entire key material is encrypted (i.e., clear key length
 490          * must be zero).
 491          */
 492         if ((!is_export && s->s2->tmp.clear != 0) ||
 493             (is_export && s->s2->tmp.clear + ek != EVP_CIPHER_key_length(c))) {
 494                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
 495                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_LENGTH);
 496                 return -1;
 497         }
 498         /*
 499          * The encrypted blob must decrypt to the encrypted portion of the key.
 500          * Decryption can't be expanding, so if we don't have enough encrypted
 501          * bytes to fit the key in the buffer, stop now.
 502          */
 503         if ((is_export && s->s2->tmp.enc < ek) ||
 504             (!is_export && s->s2->tmp.enc < EVP_CIPHER_key_length(c))) {
 505                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 506                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_LENGTH_TOO_SHORT);
 507                 return -1;
 508         }
 509
 510         i = ssl_rsa_private_decrypt(s->cert, s->s2->tmp.enc,
 511                                 &(p[s->s2->tmp.clear]),
 512                                 &(p[s->s2->tmp.clear]),
 513                                 (s->s2->ssl2_rollback) ? RSA_SSLV23_PADDING :
 514                                 RSA_PKCS1_PADDING);
 515
 516         /* bad decrypt */
 517 #if 1
 518         /* If a bad decrypt, continue with protocol but with a
 519          * random master secret (Bleichenbacher attack) */
 520         if ((i < 0) || ((!is_export && i != EVP_CIPHER_key_length(c))
 521                     || (is_export && i != ek))) {
 522                 ERR_clear_error();
 523                 if (is_export)
 524                         i=ek;
 525                 else
 526                         i=EVP_CIPHER_key_length(c);
 527                 if (RAND_pseudo_bytes(&p[s->s2->tmp.clear], i) <= 0)
 528                         return 0;
 529         }
 530 #else
 531         if (i < 0)
 532                 {
 533                 error=1;
 534                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
 535                 }
 536         /* incorrect number of key bytes for non export cipher */
 537         else if ((!is_export && (i != EVP_CIPHER_key_length(c)))
 538                 || (is_export && ((i != ek) || (s->s2->tmp.clear+i !=
 539                         EVP_CIPHER_key_length(c)))))
 540                 {
 541                 error=1;
 542                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
 543                 }
 544         if (error)
 545                 {
 546                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 547                 return(-1);
 548                 }
 549 #endif
 550
 551         if (is_export)
 552                 i = EVP_CIPHER_key_length(c);
 553
 554         if (i > SSL_MAX_MASTER_KEY_LENGTH)
 555                 {
 556                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 557                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
 558                 return -1;
 559                 }
 560         s->session->master_key_length=i;
 561         memcpy(s->session->master_key,p,(unsigned int)i);
 562         return(1);
 563         }
 564
 565 static int get_client_hello(SSL *s)
 566         {
 567         int i,n;
 568         unsigned long len;
 569         unsigned char *p;
 570         STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
 571         STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
 572         STACK_OF(SSL_CIPHER) *prio, *allow;
 573         int z;
 574
 575         /* This is a bit of a hack to check for the correct packet
 576          * type the first time round. */
 577         if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
 578                 {
 579                 s->first_packet=1;
 580                 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
 581                 }
 582
 583         p=(unsigned char *)s->init_buf->data;
 584         if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
 585                 {
 586                 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
 587                 if (i < (9-s->init_num))
 588                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 589                 s->init_num = 9;
 590
 591                 if (*(p++) != SSL2_MT_CLIENT_HELLO)
 592                         {
 593                         if (p[-1] != SSL2_MT_ERROR)
 594                                 {
 595                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 596                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
 597                                 }
 598                         else
 599                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
 600                         return(-1);
 601                         }
 602                 n2s(p,i);
 603                 if (i < s->version) s->version=i;
 604                 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
 605                 n2s(p,i); s->s2->tmp.session_id_length=i;
 606                 n2s(p,i); s->s2->challenge_length=i;
 607                 if (    (i < SSL2_MIN_CHALLENGE_LENGTH) ||
 608                         (i > SSL2_MAX_CHALLENGE_LENGTH))
 609                         {
 610                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 611                         SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
 612                         return(-1);
 613                         }
 614                 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
 615                 }
 616
 617         /* SSL2_ST_GET_CLIENT_HELLO_C */
 618         p=(unsigned char *)s->init_buf->data;
 619         len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length;
 620         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 621                 {
 622                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 623                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG);
 624                 return -1;
 625                 }
 626         n = (int)len - s->init_num;
 627         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 628         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 629         if (s->msg_callback)
 630                 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */
 631         p += 9;
 632
 633         /* get session-id before cipher stuff so we can get out session
 634          * structure if it is cached */
 635         /* session-id */
 636         if ((s->s2->tmp.session_id_length != 0) &&
 637                 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
 638                 {
 639                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 640                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
 641                 return(-1);
 642                 }
 643
 644         if (s->s2->tmp.session_id_length == 0)
 645                 {
 646                 if (!ssl_get_new_session(s,1))
 647                         {
 648                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 649                         return(-1);
 650                         }
 651                 }
 652         else
 653                 {
 654                 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
 655                         s->s2->tmp.session_id_length, NULL);
 656                 if (i == 1)
 657                         { /* previous session */
 658                         s->hit=1;
 659                         }
 660                 else if (i == -1)
 661                         {
 662                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 663                         return(-1);
 664                         }
 665                 else
 666                         {
 667                         if (s->cert == NULL)
 668                                 {
 669                                 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 670                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
 671                                 return(-1);
 672                                 }
 673
 674                         if (!ssl_get_new_session(s,1))
 675                                 {
 676                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 677                                 return(-1);
 678                                 }
 679                         }
 680                 }
 681
 682         if (!s->hit)
 683                 {
 684                 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
 685                         &s->session->ciphers);
 686                 if (cs == NULL) goto mem_err;
 687
 688                 cl=SSL_get_ciphers(s);
 689
 690                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
 691                     {
 692                     prio=sk_SSL_CIPHER_dup(cl);
 693                     if (prio == NULL) goto mem_err;
 694                     allow = cs;
 695                     }
 696                 else
 697                     {
 698                     prio = cs;
 699                     allow = cl;
 700                     }
 701                 /* Generate list of SSLv2 ciphers shared between client and server */
 702                 for (z = 0; z < sk_SSL_CIPHER_num(prio); z++)
 703                         {
 704                         const SSL_CIPHER *cp = sk_SSL_CIPHER_value(prio, z);
 705                         if ((cp->algorithm_ssl & SSL_SSLV2) == 0 ||
 706                             sk_SSL_CIPHER_find(allow, cp) < 0)
 707                                 {
 708                                 (void)sk_SSL_CIPHER_delete(prio,z);
 709                                 z--;
 710                                 }
 711                         }
 712                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
 713                     {
 714                     sk_SSL_CIPHER_free(s->session->ciphers);
 715                     s->session->ciphers = prio;
 716                     }
 717
 718                 /* Make sure we have at least one cipher in common */
 719                 if (sk_SSL_CIPHER_num(s->session->ciphers) == 0)
 720                         {
 721                         ssl2_return_error(s, SSL2_PE_NO_CIPHER);
 722                         SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_NO_CIPHER_MATCH);
 723                         return -1;
 724                         }
 725                 /* s->session->ciphers should now have a list of
 726                  * ciphers that are on both the client and server.
 727                  * This list is ordered by the order the client sent
 728                  * the ciphers or in the order of the server's preference
 729                  * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
 730                  */
 731                 }
 732         p+=s->s2->tmp.cipher_spec_length;
 733         /* done cipher selection */
 734
 735         /* session id extracted already */
 736         p+=s->s2->tmp.session_id_length;
 737
 738         /* challenge */
 739         if (s->s2->challenge_length > sizeof s->s2->challenge)
 740                 {
 741                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 742                 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 743                 return -1;
 744                 }
 745         memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
 746         return(1);
 747 mem_err:
 748         SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 749         return(0);
 750         }
 751
 752 static int server_hello(SSL *s)
 753         {
 754         unsigned char *p,*d;
 755         int n,hit;
 756
 757         p=(unsigned char *)s->init_buf->data;
 758         if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
 759                 {
 760                 d=p+11;
 761                 *(p++)=SSL2_MT_SERVER_HELLO;            /* type */
 762                 hit=s->hit;
 763                 *(p++)=(unsigned char)hit;
 764 #if 1
 765                 if (!hit)
 766                         {
 767                         if (s->session->sess_cert != NULL)
 768                                 /* This can't really happen because get_client_hello
 769                                  * has called ssl_get_new_session, which does not set
 770                                  * sess_cert. */
 771                                 ssl_sess_cert_free(s->session->sess_cert);
 772                         s->session->sess_cert = ssl_sess_cert_new();
 773                         if (s->session->sess_cert == NULL)
 774                                 {
 775                                 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
 776                                 return(-1);
 777                                 }
 778                         }
 779                 /* If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
 780                  * depending on whether it survived in the internal cache
 781                  * or was retrieved from an external cache.
 782                  * If it is NULL, we cannot put any useful data in it anyway,
 783                  * so we don't touch it.
 784                  */
 785
 786 #else /* That's what used to be done when cert_st and sess_cert_st were
 787            * the same. */
 788                 if (!hit)
 789                         {                       /* else add cert to session */
 790                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 791                         if (s->session->sess_cert != NULL)
 792                                 ssl_cert_free(s->session->sess_cert);
 793                         s->session->sess_cert=s->cert;
 794                         }
 795                 else    /* We have a session id-cache hit, if the
 796                          * session-id has no certificate listed against
 797                          * the 'cert' structure, grab the 'old' one
 798                          * listed against the SSL connection */
 799                         {
 800                         if (s->session->sess_cert == NULL)
 801                                 {
 802                                 CRYPTO_add(&s->cert->references,1,
 803                                         CRYPTO_LOCK_SSL_CERT);
 804                                 s->session->sess_cert=s->cert;
 805                                 }
 806                         }
 807 #endif
 808
 809                 if (s->cert == NULL)
 810                         {
 811                         ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 812                         SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
 813                         return(-1);
 814                         }
 815
 816                 if (hit)
 817                         {
 818                         *(p++)=0;               /* no certificate type */
 819                         s2n(s->version,p);      /* version */
 820                         s2n(0,p);               /* cert len */
 821                         s2n(0,p);               /* ciphers len */
 822                         }
 823                 else
 824                         {
 825                         /* EAY EAY */
 826                         /* put certificate type */
 827                         *(p++)=SSL2_CT_X509_CERTIFICATE;
 828                         s2n(s->version,p);      /* version */
 829                         n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 830                         s2n(n,p);               /* certificate length */
 831                         i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
 832                         n=0;
 833
 834                         /* lets send out the ciphers we like in the
 835                          * prefered order */
 836                         n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0);
 837                         d+=n;
 838                         s2n(n,p);               /* add cipher length */
 839                         }
 840
 841                 /* make and send conn_id */
 842                 s2n(SSL2_CONNECTION_ID_LENGTH,p);       /* add conn_id length */
 843                 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
 844                 if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0)
 845                         return -1;
 846                 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
 847                 d+=SSL2_CONNECTION_ID_LENGTH;
 848
 849                 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
 850                 s->init_num=d-(unsigned char *)s->init_buf->data;
 851                 s->init_off=0;
 852                 }
 853         /* SSL2_ST_SEND_SERVER_HELLO_B */
 854         /* If we are using TCP/IP, the performance is bad if we do 2
 855          * writes without a read between them.  This occurs when
 856          * Session-id reuse is used, so I will put in a buffering module
 857          */
 858         if (s->hit)
 859                 {
 860                 if (!ssl_init_wbio_buffer(s,1)) return(-1);
 861                 }
 862
 863         return(ssl2_do_write(s));
 864         }
 865
 866 static int get_client_finished(SSL *s)
 867         {
 868         unsigned char *p;
 869         int i, n;
 870         unsigned long len;
 871
 872         p=(unsigned char *)s->init_buf->data;
 873         if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
 874                 {
 875                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 876                 if (i < 1-s->init_num)
 877                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 878                 s->init_num += i;
 879
 880                 if (*p != SSL2_MT_CLIENT_FINISHED)
 881                         {
 882                         if (*p != SSL2_MT_ERROR)
 883                                 {
 884                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 885                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 886                                 }
 887                         else
 888                                 {
 889                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
 890                                 /* try to read the error message */
 891                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
 892                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
 893                                 }
 894                         return(-1);
 895                         }
 896                 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
 897                 }
 898
 899         /* SSL2_ST_GET_CLIENT_FINISHED_B */
 900         if (s->s2->conn_id_length > sizeof s->s2->conn_id)
 901                 {
 902                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 903                 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
 904                 return -1;
 905                 }
 906         len = 1 + (unsigned long)s->s2->conn_id_length;
 907         n = (int)len - s->init_num;
 908         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 909         if (i < n)
 910                 {
 911                 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 912                 }
 913         if (s->msg_callback)
 914                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */
 915         p += 1;
 916         if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0)
 917                 {
 918                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 919                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
 920                 return(-1);
 921                 }
 922         return(1);
 923         }
 924
 925 static int server_verify(SSL *s)
 926         {
 927         unsigned char *p;
 928
 929         if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
 930                 {
 931                 p=(unsigned char *)s->init_buf->data;
 932                 *(p++)=SSL2_MT_SERVER_VERIFY;
 933                 if (s->s2->challenge_length > sizeof s->s2->challenge)
 934                         {
 935                         SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
 936                         return -1;
 937                         }
 938                 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
 939                 /* p+=s->s2->challenge_length; */
 940
 941                 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
 942                 s->init_num=s->s2->challenge_length+1;
 943                 s->init_off=0;
 944                 }
 945         return(ssl2_do_write(s));
 946         }
 947
 948 static int server_finish(SSL *s)
 949         {
 950         unsigned char *p;
 951
 952         if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
 953                 {
 954                 p=(unsigned char *)s->init_buf->data;
 955                 *(p++)=SSL2_MT_SERVER_FINISHED;
 956
 957                 if (s->session->session_id_length > sizeof s->session->session_id)
 958                         {
 959                         SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
 960                         return -1;
 961                         }
 962                 memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length);
 963                 /* p+=s->session->session_id_length; */
 964
 965                 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
 966                 s->init_num=s->session->session_id_length+1;
 967                 s->init_off=0;
 968                 }
 969
 970         /* SSL2_ST_SEND_SERVER_FINISHED_B */
 971         return(ssl2_do_write(s));
 972         }
 973
 974 /* send the request and check the response */
 975 static int request_certificate(SSL *s)
 976         {
 977         const unsigned char *cp;
 978         unsigned char *p,*p2,*buf2;
 979         unsigned char *ccd;
 980         int i,j,ctype,ret= -1;
 981         unsigned long len;
 982         X509 *x509=NULL;
 983         STACK_OF(X509) *sk=NULL;
 984
 985         ccd=s->s2->tmp.ccl;
 986         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
 987                 {
 988                 p=(unsigned char *)s->init_buf->data;
 989                 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
 990                 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
 991                 if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
 992                         return -1;
 993                 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 994
 995                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
 996                 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
 997                 s->init_off=0;
 998                 }
 999
1000         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
1001                 {
1002                 i=ssl2_do_write(s);
1003                 if (i <= 0)
1004                         {
1005                         ret=i;
1006                         goto end;
1007                         }
1008
1009                 s->init_num=0;
1010                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
1011                 }
1012
1013         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
1014                 {
1015                 p=(unsigned char *)s->init_buf->data;
1016                 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */
1017                 if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3
1018                                         * (probably NO-CERTIFICATE-ERROR) */
1019                         {
1020                         ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
1021                         goto end;
1022                         }
1023                 s->init_num += i;
1024
1025                 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR))
1026                         {
1027                         n2s(p,i);
1028                         if (i != SSL2_PE_NO_CERTIFICATE)
1029                                 {
1030                                 /* not the error message we expected -- let ssl2_part_read handle it */
1031                                 s->init_num -= 3;
1032                                 ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3);
1033                                 goto end;
1034                                 }
1035
1036                         if (s->msg_callback)
1037                                 s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */
1038
1039                         /* this is the one place where we can recover from an SSL 2.0 error */
1040
1041                         if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
1042                                 {
1043                                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1044                                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1045                                 goto end;
1046                                 }
1047                         ret=1;
1048                         goto end;
1049                         }
1050                 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6))
1051                         {
1052                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
1053                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
1054                         goto end;
1055                         }
1056                 if (s->init_num != 6)
1057                         {
1058                         SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1059                         goto end;
1060                         }
1061
1062                 /* ok we have a response */
1063                 /* certificate type, there is only one right now. */
1064                 ctype= *(p++);
1065                 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
1066                         {
1067                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1068                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
1069                         goto end;
1070                         }
1071                 n2s(p,i); s->s2->tmp.clen=i;
1072                 n2s(p,i); s->s2->tmp.rlen=i;
1073                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1074                 }
1075
1076         /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1077         p=(unsigned char *)s->init_buf->data;
1078         len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1079         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
1080                 {
1081                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG);
1082                 goto end;
1083                 }
1084         j = (int)len - s->init_num;
1085         i = ssl2_read(s,(char *)&(p[s->init_num]),j);
1086         if (i < j)
1087                 {
1088                 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
1089                 goto end;
1090                 }
1091         if (s->msg_callback)
1092                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */
1093         p += 6;
1094
1095         cp = p;
1096         x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen);
1097         if (x509 == NULL)
1098                 {
1099                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
1100                 goto msg_end;
1101                 }
1102
1103         if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
1104                 {
1105                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1106                 goto msg_end;
1107                 }
1108
1109         i=ssl_verify_cert_chain(s,sk);
1110
1111         if (i > 0)      /* we like the packet, now check the chksum */
1112                 {
1113                 EVP_MD_CTX ctx;
1114                 EVP_PKEY *pkey=NULL;
1115
1116                 EVP_MD_CTX_init(&ctx);
1117                 if (!EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL)
1118                     || !EVP_VerifyUpdate(&ctx,s->s2->key_material,
1119                                          s->s2->key_material_length)
1120                     || !EVP_VerifyUpdate(&ctx,ccd,
1121                                          SSL2_MIN_CERT_CHALLENGE_LENGTH))
1122                         goto msg_end;
1123
1124                 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
1125                 buf2=OPENSSL_malloc((unsigned int)i);
1126                 if (buf2 == NULL)
1127                         {
1128                         SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1129                         goto msg_end;
1130                         }
1131                 p2=buf2;
1132                 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
1133                 if (!EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i))
1134                         {
1135                         OPENSSL_free(buf2);
1136                         goto msg_end;
1137                         }
1138                 OPENSSL_free(buf2);
1139
1140                 pkey=X509_get_pubkey(x509);
1141                 if (pkey == NULL) goto end;
1142                 i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey);
1143                 EVP_PKEY_free(pkey);
1144                 EVP_MD_CTX_cleanup(&ctx);
1145
1146                 if (i > 0)
1147                         {
1148                         if (s->session->peer != NULL)
1149                                 X509_free(s->session->peer);
1150                         s->session->peer=x509;
1151                         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
1152                         s->session->verify_result = s->verify_result;
1153                         ret=1;
1154                         goto end;
1155                         }
1156                 else
1157                         {
1158                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
1159                         goto msg_end;
1160                         }
1161                 }
1162         else
1163                 {
1164 msg_end:
1165                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1166                 }
1167 end:
1168         sk_X509_free(sk);
1169         X509_free(x509);
1170         return(ret);
1171         }
1172
1173 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1174              unsigned char *to, int padding)
1175         {
1176         RSA *rsa;
1177         int i;
1178
1179         if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
1180                 {
1181                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
1182                 return(-1);
1183                 }
1184         if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
1185                 {
1186                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1187                 return(-1);
1188                 }
1189         rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1190
1191         /* we have the public key */
1192         i=RSA_private_decrypt(len,from,to,rsa,padding);
1193         if (i < 0)
1194                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
1195         return(i);
1196         }
1197 #else /* !OPENSSL_NO_SSL2 */
1198
1199 # if PEDANTIC
1200 static void *dummy=&dummy;
1201 # endif
1202
1203 #endif