ssl/s2_clnt.c

   1 /* ssl/s2_clnt.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/rand.h>
 116 #include <openssl/buffer.h>
 117 #include <openssl/objects.h>
 118 #include <openssl/evp.h>
 119
 120 static SSL_METHOD *ssl2_get_client_method(int ver);
 121 static int get_server_finished(SSL *s);
 122 static int get_server_verify(SSL *s);
 123 static int get_server_hello(SSL *s);
 124 static int client_hello(SSL *s);
 125 static int client_master_key(SSL *s);
 126 static int client_finished(SSL *s);
 127 static int client_certificate(SSL *s);
 128 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
 129         unsigned char *to,int padding);
 130 #define BREAK   break
 131
 132 static SSL_METHOD *ssl2_get_client_method(int ver)
 133         {
 134         if (ver == SSL2_VERSION)
 135                 return(SSLv2_client_method());
 136         else
 137                 return(NULL);
 138         }
 139
 140 SSL_METHOD *SSLv2_client_method(void)
 141         {
 142         static int init=1;
 143         static SSL_METHOD SSLv2_client_data;
 144
 145         if (init)
 146                 {
 147                 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
 148                         sizeof(SSL_METHOD));
 149                 SSLv2_client_data.ssl_connect=ssl2_connect;
 150                 SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
 151                 init=0;
 152                 }
 153         return(&SSLv2_client_data);
 154         }
 155
 156 int ssl2_connect(SSL *s)
 157         {
 158         unsigned long l=time(NULL);
 159         BUF_MEM *buf=NULL;
 160         int ret= -1;
 161         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 162         int new_state,state;
 163
 164         RAND_add(&l,sizeof(l),0);
 165         ERR_clear_error();
 166         clear_sys_error();
 167
 168         if (s->info_callback != NULL)
 169                 cb=s->info_callback;
 170         else if (s->ctx->info_callback != NULL)
 171                 cb=s->ctx->info_callback;
 172
 173         /* init things to blank */
 174         s->in_handshake++;
 175         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 176
 177         for (;;)
 178                 {
 179                 state=s->state;
 180
 181                 switch (s->state)
 182                         {
 183                 case SSL_ST_BEFORE:
 184                 case SSL_ST_CONNECT:
 185                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 186                 case SSL_ST_OK|SSL_ST_CONNECT:
 187
 188                         s->server=0;
 189                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 190
 191                         s->version=SSL2_VERSION;
 192                         s->type=SSL_ST_CONNECT;
 193
 194                         buf=s->init_buf;
 195                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 196                                 {
 197                                 ret= -1;
 198                                 goto end;
 199                                 }
 200                         if (!BUF_MEM_grow(buf,
 201                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 202                                 {
 203                                 ret= -1;
 204                                 goto end;
 205                                 }
 206                         s->init_buf=buf;
 207                         s->init_num=0;
 208                         s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
 209                         s->ctx->stats.sess_connect++;
 210                         s->handshake_func=ssl2_connect;
 211                         BREAK;
 212
 213                 case SSL2_ST_SEND_CLIENT_HELLO_A:
 214                 case SSL2_ST_SEND_CLIENT_HELLO_B:
 215                         s->shutdown=0;
 216                         ret=client_hello(s);
 217                         if (ret <= 0) goto end;
 218                         s->init_num=0;
 219                         s->state=SSL2_ST_GET_SERVER_HELLO_A;
 220                         BREAK;
 221
 222                 case SSL2_ST_GET_SERVER_HELLO_A:
 223                 case SSL2_ST_GET_SERVER_HELLO_B:
 224                         ret=get_server_hello(s);
 225                         if (ret <= 0) goto end;
 226                         s->init_num=0;
 227                         if (!s->hit) /* new session */
 228                                 {
 229                                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
 230                                 BREAK;
 231                                 }
 232                         else
 233                                 {
 234                                 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 235                                 break;
 236                                 }
 237
 238                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
 239                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
 240                         ret=client_master_key(s);
 241                         if (ret <= 0) goto end;
 242                         s->init_num=0;
 243                         s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 244                         break;
 245
 246                 case SSL2_ST_CLIENT_START_ENCRYPTION:
 247                         /* Ok, we now have all the stuff needed to
 248                          * start encrypting, so lets fire it up :-) */
 249                         if (!ssl2_enc_init(s,1))
 250                                 {
 251                                 ret= -1;
 252                                 goto end;
 253                                 }
 254                         s->s2->clear_text=0;
 255                         s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
 256                         break;
 257
 258                 case SSL2_ST_SEND_CLIENT_FINISHED_A:
 259                 case SSL2_ST_SEND_CLIENT_FINISHED_B:
 260                         ret=client_finished(s);
 261                         if (ret <= 0) goto end;
 262                         s->init_num=0;
 263                         s->state=SSL2_ST_GET_SERVER_VERIFY_A;
 264                         break;
 265
 266                 case SSL2_ST_GET_SERVER_VERIFY_A:
 267                 case SSL2_ST_GET_SERVER_VERIFY_B:
 268                         ret=get_server_verify(s);
 269                         if (ret <= 0) goto end;
 270                         s->init_num=0;
 271                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 272                         break;
 273
 274                 case SSL2_ST_GET_SERVER_FINISHED_A:
 275                 case SSL2_ST_GET_SERVER_FINISHED_B:
 276                         ret=get_server_finished(s);
 277                         if (ret <= 0) goto end;
 278                         break;
 279
 280                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
 281                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
 282                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
 283                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
 284                 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
 285                         ret=client_certificate(s);
 286                         if (ret <= 0) goto end;
 287                         s->init_num=0;
 288                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 289                         break;
 290
 291                 case SSL_ST_OK:
 292                         if (s->init_buf != NULL)
 293                                 {
 294                                 BUF_MEM_free(s->init_buf);
 295                                 s->init_buf=NULL;
 296                                 }
 297                         s->init_num=0;
 298                 /*      ERR_clear_error();*/
 299
 300                         /* If we want to cache session-ids in the client
 301                          * and we successfully add the session-id to the
 302                          * cache, and there is a callback, then pass it out.
 303                          * 26/11/96 - eay - only add if not a re-used session.
 304                          */
 305
 306                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 307                         if (s->hit) s->ctx->stats.sess_hit++;
 308
 309                         ret=1;
 310                         /* s->server=0; */
 311                         s->ctx->stats.sess_connect_good++;
 312
 313                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 314
 315                         goto end;
 316                         /* break; */
 317                 default:
 318                         SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
 319                         return(-1);
 320                         /* break; */
 321                         }
 322
 323                 if ((cb != NULL) && (s->state != state))
 324                         {
 325                         new_state=s->state;
 326                         s->state=state;
 327                         cb(s,SSL_CB_CONNECT_LOOP,1);
 328                         s->state=new_state;
 329                         }
 330                 }
 331 end:
 332         s->in_handshake--;
 333         if (cb != NULL)
 334                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 335         return(ret);
 336         }
 337
 338 static int get_server_hello(SSL *s)
 339         {
 340         unsigned char *buf;
 341         unsigned char *p;
 342         int i,j;
 343         unsigned long len;
 344         STACK_OF(SSL_CIPHER) *sk=NULL,*cl, *prio, *allow;
 345
 346         buf=(unsigned char *)s->init_buf->data;
 347         p=buf;
 348         if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
 349                 {
 350                 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
 351                 if (i < (11-s->init_num))
 352                         return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 353                 s->init_num = 11;
 354
 355                 if (*(p++) != SSL2_MT_SERVER_HELLO)
 356                         {
 357                         if (p[-1] != SSL2_MT_ERROR)
 358                                 {
 359                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 360                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 361                                         SSL_R_READ_WRONG_PACKET_TYPE);
 362                                 }
 363                         else
 364                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 365                                         SSL_R_PEER_ERROR);
 366                         return(-1);
 367                         }
 368 #ifdef __APPLE_CC__
 369                 /* The Rhapsody 5.5 (a.k.a. MacOS X) compiler bug
 370                  * workaround. <appro@fy.chalmers.se> */
 371                 s->hit=(i=*(p++))?1:0;
 372 #else
 373                 s->hit=(*(p++))?1:0;
 374 #endif
 375                 s->s2->tmp.cert_type= *(p++);
 376                 n2s(p,i);
 377                 if (i < s->version) s->version=i;
 378                 n2s(p,i); s->s2->tmp.cert_length=i;
 379                 n2s(p,i); s->s2->tmp.csl=i;
 380                 n2s(p,i); s->s2->tmp.conn_id_length=i;
 381                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
 382                 }
 383
 384         /* SSL2_ST_GET_SERVER_HELLO_B */
 385         len = 11 + (unsigned long)s->s2->tmp.cert_length + (unsigned long)s->s2->tmp.csl + (unsigned long)s->s2->tmp.conn_id_length;
 386         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 387                 {
 388                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_MESSAGE_TOO_LONG);
 389                 return -1;
 390                 }
 391         j = (int)len - s->init_num;
 392         i = ssl2_read(s,(char *)&(buf[s->init_num]),j);
 393         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 394         if (s->msg_callback)
 395                 s->msg_callback(0, s->version, 0, buf, (size_t)len, s, s->msg_callback_arg); /* SERVER-HELLO */
 396
 397         /* things are looking good */
 398
 399         p = buf + 11;
 400         if (s->hit)
 401                 {
 402                 if (s->s2->tmp.cert_length != 0)
 403                         {
 404                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
 405                         return(-1);
 406                         }
 407                 if (s->s2->tmp.cert_type != 0)
 408                         {
 409                         if (!(s->options &
 410                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
 411                                 {
 412                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
 413                                 return(-1);
 414                                 }
 415                         }
 416                 if (s->s2->tmp.csl != 0)
 417                         {
 418                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
 419                         return(-1);
 420                         }
 421                 }
 422         else
 423                 {
 424 #ifdef undef
 425                 /* very bad */
 426                 memset(s->session->session_id,0,
 427                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
 428                 s->session->session_id_length=0;
 429                 */
 430 #endif
 431
 432                 /* we need to do this in case we were trying to reuse a
 433                  * client session but others are already reusing it.
 434                  * If this was a new 'blank' session ID, the session-id
 435                  * length will still be 0 */
 436                 if (s->session->session_id_length > 0)
 437                         {
 438                         if (!ssl_get_new_session(s,0))
 439                                 {
 440                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 441                                 return(-1);
 442                                 }
 443                         }
 444
 445                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
 446                         s->s2->tmp.cert_length,p) <= 0)
 447                         {
 448                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 449                         return(-1);
 450                         }
 451                 p+=s->s2->tmp.cert_length;
 452
 453                 if (s->s2->tmp.csl == 0)
 454                         {
 455                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 456                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
 457                         return(-1);
 458                         }
 459
 460                 /* We have just received a list of ciphers back from the
 461                  * server.  We need to get the ones that match, then select
 462                  * the one we want the most :-). */
 463
 464                 /* load the ciphers */
 465                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
 466                                             &s->session->ciphers);
 467                 p+=s->s2->tmp.csl;
 468                 if (sk == NULL)
 469                         {
 470                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 471                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
 472                         return(-1);
 473                         }
 474
 475                 sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
 476
 477                 /* get the array of ciphers we will accept */
 478                 cl=SSL_get_ciphers(s);
 479                 sk_SSL_CIPHER_set_cmp_func(cl,ssl_cipher_ptr_id_cmp);
 480
 481                 /*
 482                  * If server preference flag set, choose the first
 483                  * (highest priority) cipher the server sends, otherwise
 484                  * client preference has priority.
 485                  */
 486                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
 487                     {
 488                     prio = sk;
 489                     allow = cl;
 490                     }
 491                 else
 492                     {
 493                     prio = cl;
 494                     allow = sk;
 495                     }
 496                 /* In theory we could have ciphers sent back that we
 497                  * don't want to use but that does not matter since we
 498                  * will check against the list we originally sent and
 499                  * for performance reasons we should not bother to match
 500                  * the two lists up just to check. */
 501                 for (i=0; i<sk_SSL_CIPHER_num(prio); i++)
 502                         {
 503                         if (sk_SSL_CIPHER_find(allow,
 504                                              sk_SSL_CIPHER_value(prio,i)) >= 0)
 505                                 break;
 506                         }
 507
 508                 if (i >= sk_SSL_CIPHER_num(prio))
 509                         {
 510                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 511                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
 512                         return(-1);
 513                         }
 514                 s->session->cipher=sk_SSL_CIPHER_value(prio,i);
 515
 516
 517                 if (s->session->peer != NULL) /* can't happen*/
 518                         {
 519                         ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
 520                         SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 521                         return(-1);
 522                         }
 523
 524                 s->session->peer = s->session->sess_cert->peer_key->x509;
 525                 /* peer_key->x509 has been set by ssl2_set_certificate. */
 526                 CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
 527                 }
 528
 529         if (s->session->peer != s->session->sess_cert->peer_key->x509)
 530                 /* can't happen */
 531                 {
 532                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
 533                 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 534                 return(-1);
 535                 }
 536
 537         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
 538         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
 539         return(1);
 540         }
 541
 542 static int client_hello(SSL *s)
 543         {
 544         unsigned char *buf;
 545         unsigned char *p,*d;
 546 /*      CIPHER **cipher;*/
 547         int i,n,j;
 548
 549         buf=(unsigned char *)s->init_buf->data;
 550         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
 551                 {
 552                 if ((s->session == NULL) ||
 553                         (s->session->ssl_version != s->version))
 554                         {
 555                         if (!ssl_get_new_session(s,0))
 556                                 {
 557                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 558                                 return(-1);
 559                                 }
 560                         }
 561                 /* else use the pre-loaded session */
 562
 563                 p=buf;                                  /* header */
 564                 d=p+9;                                  /* data section */
 565                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
 566                 s2n(SSL2_VERSION,p);                    /* version */
 567                 n=j=0;
 568
 569                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d);
 570                 d+=n;
 571
 572                 if (n == 0)
 573                         {
 574                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 575                         return(-1);
 576                         }
 577
 578                 s2n(n,p);                       /* cipher spec num bytes */
 579
 580                 if ((s->session->session_id_length > 0) &&
 581                         (s->session->session_id_length <=
 582                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
 583                         {
 584                         i=s->session->session_id_length;
 585                         s2n(i,p);               /* session id length */
 586                         memcpy(d,s->session->session_id,(unsigned int)i);
 587                         d+=i;
 588                         }
 589                 else
 590                         {
 591                         s2n(0,p);
 592                         }
 593
 594                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
 595                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
 596                 /*challenge id data*/
 597                 RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 598                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 599                 d+=SSL2_CHALLENGE_LENGTH;
 600
 601                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
 602                 s->init_num=d-buf;
 603                 s->init_off=0;
 604                 }
 605         /* SSL2_ST_SEND_CLIENT_HELLO_B */
 606         return(ssl2_do_write(s));
 607         }
 608
 609 static int client_master_key(SSL *s)
 610         {
 611         unsigned char *buf;
 612         unsigned char *p,*d;
 613         int clear,enc,karg,i;
 614         SSL_SESSION *sess;
 615         const EVP_CIPHER *c;
 616         const EVP_MD *md;
 617
 618         buf=(unsigned char *)s->init_buf->data;
 619         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
 620                 {
 621
 622                 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
 623                         {
 624                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 625                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 626                         return(-1);
 627                         }
 628                 sess=s->session;
 629                 p=buf;
 630                 d=p+10;
 631                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
 632
 633                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
 634                 p+=i;
 635
 636                 /* make key_arg data */
 637                 i=EVP_CIPHER_iv_length(c);
 638                 sess->key_arg_length=i;
 639                 if (i > 0) RAND_pseudo_bytes(sess->key_arg,i);
 640
 641                 /* make a master key */
 642                 i=EVP_CIPHER_key_length(c);
 643                 sess->master_key_length=i;
 644                 if (i > 0)
 645                         {
 646                         if (RAND_bytes(sess->master_key,i) <= 0)
 647                                 {
 648                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 649                                 return(-1);
 650                                 }
 651                         }
 652
 653                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 654                         enc=8;
 655                 else if (SSL_C_IS_EXPORT(sess->cipher))
 656                         enc=5;
 657                 else
 658                         enc=i;
 659
 660                 if (i < enc)
 661                         {
 662                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 663                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
 664                         return(-1);
 665                         }
 666                 clear=i-enc;
 667                 s2n(clear,p);
 668                 memcpy(d,sess->master_key,(unsigned int)clear);
 669                 d+=clear;
 670
 671                 enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
 672                         &(sess->master_key[clear]),d,
 673                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 674                 if (enc <= 0)
 675                         {
 676                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 677                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
 678                         return(-1);
 679                         }
 680 #ifdef PKCS1_CHECK
 681                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
 682                 if (s->options & SSL_OP_PKCS1_CHECK_2)
 683                         sess->master_key[clear]++;
 684 #endif
 685                 s2n(enc,p);
 686                 d+=enc;
 687                 karg=sess->key_arg_length;
 688                 s2n(karg,p); /* key arg size */
 689                 memcpy(d,sess->key_arg,(unsigned int)karg);
 690                 d+=karg;
 691
 692                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
 693                 s->init_num=d-buf;
 694                 s->init_off=0;
 695                 }
 696
 697         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
 698         return(ssl2_do_write(s));
 699         }
 700
 701 static int client_finished(SSL *s)
 702         {
 703         unsigned char *p;
 704
 705         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
 706                 {
 707                 p=(unsigned char *)s->init_buf->data;
 708                 *(p++)=SSL2_MT_CLIENT_FINISHED;
 709                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
 710
 711                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
 712                 s->init_num=s->s2->conn_id_length+1;
 713                 s->init_off=0;
 714                 }
 715         return(ssl2_do_write(s));
 716         }
 717
 718 /* read the data and then respond */
 719 static int client_certificate(SSL *s)
 720         {
 721         unsigned char *buf;
 722         unsigned char *p,*d;
 723         int i;
 724         unsigned int n;
 725         int cert_ch_len;
 726         unsigned char *cert_ch;
 727
 728         buf=(unsigned char *)s->init_buf->data;
 729
 730         /* We have a cert associated with the SSL, so attach it to
 731          * the session if it does not have one */
 732
 733         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
 734                 {
 735                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
 736                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
 737                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
 738                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
 739                 s->init_num += i;
 740                 if (s->msg_callback)
 741                         s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* REQUEST-CERTIFICATE */
 742
 743                 /* type=buf[0]; */
 744                 /* type eq x509 */
 745                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 746                         {
 747                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 748                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
 749                         return(-1);
 750                         }
 751
 752                 if ((s->cert == NULL) ||
 753                         (s->cert->key->x509 == NULL) ||
 754                         (s->cert->key->privatekey == NULL))
 755                         {
 756                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
 757                         }
 758                 else
 759                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 760                 }
 761
 762         cert_ch = buf + 2;
 763         cert_ch_len = s->init_num - 2;
 764
 765         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
 766                 {
 767                 X509 *x509=NULL;
 768                 EVP_PKEY *pkey=NULL;
 769
 770                 /* If we get an error we need to
 771                  * ssl->rwstate=SSL_X509_LOOKUP;
 772                  * return(error);
 773                  * We should then be retried when things are ok and we
 774                  * can get a cert or not */
 775
 776                 i=0;
 777                 if (s->ctx->client_cert_cb != NULL)
 778                         {
 779                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
 780                         }
 781
 782                 if (i < 0)
 783                         {
 784                         s->rwstate=SSL_X509_LOOKUP;
 785                         return(-1);
 786                         }
 787                 s->rwstate=SSL_NOTHING;
 788
 789                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
 790                         {
 791                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 792                         if (    !SSL_use_certificate(s,x509) ||
 793                                 !SSL_use_PrivateKey(s,pkey))
 794                                 {
 795                                 i=0;
 796                                 }
 797                         X509_free(x509);
 798                         EVP_PKEY_free(pkey);
 799                         }
 800                 else if (i == 1)
 801                         {
 802                         if (x509 != NULL) X509_free(x509);
 803                         if (pkey != NULL) EVP_PKEY_free(pkey);
 804                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
 805                         i=0;
 806                         }
 807
 808                 if (i == 0)
 809                         {
 810                         /* We have no client certificate to respond with
 811                          * so send the correct error message back */
 812                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
 813                         p=buf;
 814                         *(p++)=SSL2_MT_ERROR;
 815                         s2n(SSL2_PE_NO_CERTIFICATE,p);
 816                         s->init_off=0;
 817                         s->init_num=3;
 818                         /* Write is done at the end */
 819                         }
 820                 }
 821
 822         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
 823                 {
 824                 return(ssl2_do_write(s));
 825                 }
 826
 827         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
 828                 {
 829                 EVP_MD_CTX ctx;
 830
 831                 /* ok, now we calculate the checksum
 832                  * do it first so we can reuse buf :-) */
 833                 p=buf;
 834                 EVP_MD_CTX_init(&ctx);
 835                 EVP_SignInit_ex(&ctx,s->ctx->rsa_md5, NULL);
 836                 EVP_SignUpdate(&ctx,s->s2->key_material,
 837                         (unsigned int)s->s2->key_material_length);
 838                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
 839                 n=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
 840                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
 841
 842                 p=buf;
 843                 d=p+6;
 844                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
 845                 *(p++)=SSL2_CT_X509_CERTIFICATE;
 846                 n=i2d_X509(s->cert->key->x509,&d);
 847                 s2n(n,p);
 848
 849                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
 850                         {
 851                         /* this is not good.  If things have failed it
 852                          * means there so something wrong with the key.
 853                          * We will continue with a 0 length signature
 854                          */
 855                         }
 856                 EVP_MD_CTX_cleanup(&ctx);
 857                 s2n(n,p);
 858                 d+=n;
 859
 860                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
 861                 s->init_num=d-buf;
 862                 s->init_off=0;
 863                 }
 864         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
 865         return(ssl2_do_write(s));
 866         }
 867
 868 static int get_server_verify(SSL *s)
 869         {
 870         unsigned char *p;
 871         int i, n, len;
 872
 873         p=(unsigned char *)s->init_buf->data;
 874         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
 875                 {
 876                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 877                 if (i < (1-s->init_num))
 878                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 879                 s->init_num += i;
 880
 881                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
 882                 if (*p != SSL2_MT_SERVER_VERIFY)
 883                         {
 884                         if (p[0] != SSL2_MT_ERROR)
 885                                 {
 886                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 887                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 888                                         SSL_R_READ_WRONG_PACKET_TYPE);
 889                                 }
 890                         else
 891                                 {
 892                                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_PEER_ERROR);
 893                                 /* try to read the error message */
 894                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
 895                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
 896                                 }
 897                         return(-1);
 898                         }
 899                 }
 900
 901         p=(unsigned char *)s->init_buf->data;
 902         len = 1 + s->s2->challenge_length;
 903         n =  len - s->init_num;
 904         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 905         if (i < n)
 906                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 907         if (s->msg_callback)
 908                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* SERVER-VERIFY */
 909         p += 1;
 910
 911         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
 912                 {
 913                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 914                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
 915                 return(-1);
 916                 }
 917         return(1);
 918         }
 919
 920 static int get_server_finished(SSL *s)
 921         {
 922         unsigned char *buf;
 923         unsigned char *p;
 924         int i, n, len;
 925
 926         buf=(unsigned char *)s->init_buf->data;
 927         p=buf;
 928         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
 929                 {
 930                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
 931                 if (i < (1-s->init_num))
 932                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 933                 s->init_num += i;
 934
 935                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
 936                         {
 937                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
 938                         return(1);
 939                         }
 940                 else if (*p != SSL2_MT_SERVER_FINISHED)
 941                         {
 942                         if (p[0] != SSL2_MT_ERROR)
 943                                 {
 944                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 945                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 946                                 }
 947                         else
 948                                 {
 949                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
 950                                 /* try to read the error message */
 951                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
 952                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
 953                                 }
 954                         return(-1);
 955                         }
 956                 s->state=SSL2_ST_GET_SERVER_FINISHED_B;
 957                 }
 958
 959         len = 1 + SSL2_SSL_SESSION_ID_LENGTH;
 960         n = len - s->init_num;
 961         i = ssl2_read(s,(char *)&(buf[s->init_num]), n);
 962         if (i < n) /* XXX could be shorter than SSL2_SSL_SESSION_ID_LENGTH, that's the maximum */
 963                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 964         s->init_num += i;
 965         if (s->msg_callback)
 966                 s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* SERVER-FINISHED */
 967
 968         if (!s->hit) /* new session */
 969                 {
 970                 /* new session-id */
 971                 /* Make sure we were not trying to re-use an old SSL_SESSION
 972                  * or bad things can happen */
 973                 /* ZZZZZZZZZZZZZ */
 974                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
 975                 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH);
 976                 }
 977         else
 978                 {
 979                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
 980                         {
 981                         if (memcmp(buf,s->session->session_id,
 982                                 (unsigned int)s->session->session_id_length) != 0)
 983                                 {
 984                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 985                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
 986                                 return(-1);
 987                                 }
 988                         }
 989                 }
 990         s->state = SSL_ST_OK;
 991         return(1);
 992         }
 993
 994 /* loads in the certificate from the server */
 995 int ssl2_set_certificate(SSL *s, int type, int len, unsigned char *data)
 996         {
 997         STACK_OF(X509) *sk=NULL;
 998         EVP_PKEY *pkey=NULL;
 999         SESS_CERT *sc=NULL;
1000         int i;
1001         X509 *x509=NULL;
1002         int ret=0;
1003
1004         x509=d2i_X509(NULL,&data,(long)len);
1005         if (x509 == NULL)
1006                 {
1007                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
1008                 goto err;
1009                 }
1010
1011         if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
1012                 {
1013                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1014                 goto err;
1015                 }
1016
1017         i=ssl_verify_cert_chain(s,sk);
1018
1019         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
1020                 {
1021                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1022                 goto err;
1023                 }
1024         ERR_clear_error(); /* but we keep s->verify_result */
1025         s->session->verify_result = s->verify_result;
1026
1027         /* server's cert for this session */
1028         sc=ssl_sess_cert_new();
1029         if (sc == NULL)
1030                 {
1031                 ret= -1;
1032                 goto err;
1033                 }
1034         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1035         s->session->sess_cert=sc;
1036
1037         sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
1038         sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);
1039
1040         pkey=X509_get_pubkey(x509);
1041         x509=NULL;
1042         if (pkey == NULL)
1043                 {
1044                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
1045                 goto err;
1046                 }
1047         if (pkey->type != EVP_PKEY_RSA)
1048                 {
1049                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
1050                 goto err;
1051                 }
1052
1053         if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
1054                 goto err;
1055         ret=1;
1056 err:
1057         sk_X509_free(sk);
1058         X509_free(x509);
1059         EVP_PKEY_free(pkey);
1060         return(ret);
1061         }
1062
1063 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
1064              unsigned char *to, int padding)
1065         {
1066         EVP_PKEY *pkey=NULL;
1067         int i= -1;
1068
1069         if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
1070                 ((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
1071                 {
1072                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
1073                 return(-1);
1074                 }
1075         if (pkey->type != EVP_PKEY_RSA)
1076                 {
1077                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1078                 goto end;
1079                 }
1080
1081         /* we have the public key */
1082         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
1083         if (i < 0)
1084                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
1085 end:
1086         EVP_PKEY_free(pkey);
1087         return(i);
1088         }
1089 #else /* !OPENSSL_NO_SSL2 */
1090
1091 # if PEDANTIC
1092 static void *dummy=&dummy;
1093 # endif
1094
1095 #endif