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 #include "cryptlib.h"
 120
 121 static SSL_METHOD *ssl2_get_client_method(int ver);
 122 static int get_server_finished(SSL *s);
 123 static int get_server_verify(SSL *s);
 124 static int get_server_hello(SSL *s);
 125 static int client_hello(SSL *s);
 126 static int client_master_key(SSL *s);
 127 static int client_finished(SSL *s);
 128 static int client_certificate(SSL *s);
 129 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
 130         unsigned char *to,int padding);
 131 #define BREAK   break
 132
 133 static SSL_METHOD *ssl2_get_client_method(int ver)
 134         {
 135         if (ver == SSL2_VERSION)
 136                 return(SSLv2_client_method());
 137         else
 138                 return(NULL);
 139         }
 140
 141 SSL_METHOD *SSLv2_client_method(void)
 142         {
 143         static int init=1;
 144         static SSL_METHOD SSLv2_client_data;
 145
 146         if (init)
 147                 {
 148                 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
 149                         sizeof(SSL_METHOD));
 150                 SSLv2_client_data.ssl_connect=ssl2_connect;
 151                 SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
 152                 init=0;
 153                 }
 154         return(&SSLv2_client_data);
 155         }
 156
 157 int ssl2_connect(SSL *s)
 158         {
 159         unsigned long l=time(NULL);
 160         BUF_MEM *buf=NULL;
 161         int ret= -1;
 162         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 163         int new_state,state;
 164
 165         RAND_add(&l,sizeof(l),0);
 166         ERR_clear_error();
 167         clear_sys_error();
 168
 169         if (s->info_callback != NULL)
 170                 cb=s->info_callback;
 171         else if (s->ctx->info_callback != NULL)
 172                 cb=s->ctx->info_callback;
 173
 174         /* init things to blank */
 175         s->in_handshake++;
 176         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 177
 178         for (;;)
 179                 {
 180                 state=s->state;
 181
 182                 switch (s->state)
 183                         {
 184                 case SSL_ST_BEFORE:
 185                 case SSL_ST_CONNECT:
 186                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 187                 case SSL_ST_OK|SSL_ST_CONNECT:
 188
 189                         s->server=0;
 190                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 191
 192                         s->version=SSL2_VERSION;
 193                         s->type=SSL_ST_CONNECT;
 194
 195                         buf=s->init_buf;
 196                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 197                                 {
 198                                 ret= -1;
 199                                 goto end;
 200                                 }
 201                         if (!BUF_MEM_grow(buf,
 202                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 203                                 {
 204                                 ret= -1;
 205                                 goto end;
 206                                 }
 207                         s->init_buf=buf;
 208                         s->init_num=0;
 209                         s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
 210                         s->ctx->stats.sess_connect++;
 211                         s->handshake_func=ssl2_connect;
 212                         BREAK;
 213
 214                 case SSL2_ST_SEND_CLIENT_HELLO_A:
 215                 case SSL2_ST_SEND_CLIENT_HELLO_B:
 216                         s->shutdown=0;
 217                         ret=client_hello(s);
 218                         if (ret <= 0) goto end;
 219                         s->init_num=0;
 220                         s->state=SSL2_ST_GET_SERVER_HELLO_A;
 221                         BREAK;
 222
 223                 case SSL2_ST_GET_SERVER_HELLO_A:
 224                 case SSL2_ST_GET_SERVER_HELLO_B:
 225                         ret=get_server_hello(s);
 226                         if (ret <= 0) goto end;
 227                         s->init_num=0;
 228                         if (!s->hit) /* new session */
 229                                 {
 230                                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
 231                                 BREAK;
 232                                 }
 233                         else
 234                                 {
 235                                 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 236                                 break;
 237                                 }
 238
 239                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
 240                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
 241                         ret=client_master_key(s);
 242                         if (ret <= 0) goto end;
 243                         s->init_num=0;
 244                         s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 245                         break;
 246
 247                 case SSL2_ST_CLIENT_START_ENCRYPTION:
 248                         /* Ok, we now have all the stuff needed to
 249                          * start encrypting, so lets fire it up :-) */
 250                         if (!ssl2_enc_init(s,1))
 251                                 {
 252                                 ret= -1;
 253                                 goto end;
 254                                 }
 255                         s->s2->clear_text=0;
 256                         s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
 257                         break;
 258
 259                 case SSL2_ST_SEND_CLIENT_FINISHED_A:
 260                 case SSL2_ST_SEND_CLIENT_FINISHED_B:
 261                         ret=client_finished(s);
 262                         if (ret <= 0) goto end;
 263                         s->init_num=0;
 264                         s->state=SSL2_ST_GET_SERVER_VERIFY_A;
 265                         break;
 266
 267                 case SSL2_ST_GET_SERVER_VERIFY_A:
 268                 case SSL2_ST_GET_SERVER_VERIFY_B:
 269                         ret=get_server_verify(s);
 270                         if (ret <= 0) goto end;
 271                         s->init_num=0;
 272                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 273                         break;
 274
 275                 case SSL2_ST_GET_SERVER_FINISHED_A:
 276                 case SSL2_ST_GET_SERVER_FINISHED_B:
 277                         ret=get_server_finished(s);
 278                         if (ret <= 0) goto end;
 279                         break;
 280
 281                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
 282                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
 283                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
 284                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
 285                 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
 286                         ret=client_certificate(s);
 287                         if (ret <= 0) goto end;
 288                         s->init_num=0;
 289                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 290                         break;
 291
 292                 case SSL_ST_OK:
 293                         if (s->init_buf != NULL)
 294                                 {
 295                                 BUF_MEM_free(s->init_buf);
 296                                 s->init_buf=NULL;
 297                                 }
 298                         s->init_num=0;
 299                 /*      ERR_clear_error();*/
 300
 301                         /* If we want to cache session-ids in the client
 302                          * and we successfully add the session-id to the
 303                          * cache, and there is a callback, then pass it out.
 304                          * 26/11/96 - eay - only add if not a re-used session.
 305                          */
 306
 307                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 308                         if (s->hit) s->ctx->stats.sess_hit++;
 309
 310                         ret=1;
 311                         /* s->server=0; */
 312                         s->ctx->stats.sess_connect_good++;
 313
 314                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 315
 316                         goto end;
 317                         /* break; */
 318                 default:
 319                         SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
 320                         return(-1);
 321                         /* break; */
 322                         }
 323
 324                 if ((cb != NULL) && (s->state != state))
 325                         {
 326                         new_state=s->state;
 327                         s->state=state;
 328                         cb(s,SSL_CB_CONNECT_LOOP,1);
 329                         s->state=new_state;
 330                         }
 331                 }
 332 end:
 333         s->in_handshake--;
 334         if (cb != NULL)
 335                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 336         return(ret);
 337         }
 338
 339 static int get_server_hello(SSL *s)
 340         {
 341         unsigned char *buf;
 342         unsigned char *p;
 343         int i,j;
 344         unsigned long len;
 345         STACK_OF(SSL_CIPHER) *sk=NULL,*cl, *prio, *allow;
 346
 347         buf=(unsigned char *)s->init_buf->data;
 348         p=buf;
 349         if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
 350                 {
 351                 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
 352                 if (i < (11-s->init_num))
 353                         return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 354                 s->init_num = 11;
 355
 356                 if (*(p++) != SSL2_MT_SERVER_HELLO)
 357                         {
 358                         if (p[-1] != SSL2_MT_ERROR)
 359                                 {
 360                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 361                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 362                                         SSL_R_READ_WRONG_PACKET_TYPE);
 363                                 }
 364                         else
 365                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 366                                         SSL_R_PEER_ERROR);
 367                         return(-1);
 368                         }
 369 #ifdef __APPLE_CC__
 370                 /* The Rhapsody 5.5 (a.k.a. MacOS X) compiler bug
 371                  * workaround. <appro@fy.chalmers.se> */
 372                 s->hit=(i=*(p++))?1:0;
 373 #else
 374                 s->hit=(*(p++))?1:0;
 375 #endif
 376                 s->s2->tmp.cert_type= *(p++);
 377                 n2s(p,i);
 378                 if (i < s->version) s->version=i;
 379                 n2s(p,i); s->s2->tmp.cert_length=i;
 380                 n2s(p,i); s->s2->tmp.csl=i;
 381                 n2s(p,i); s->s2->tmp.conn_id_length=i;
 382                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
 383                 }
 384
 385         /* SSL2_ST_GET_SERVER_HELLO_B */
 386         len = 11 + (unsigned long)s->s2->tmp.cert_length + (unsigned long)s->s2->tmp.csl + (unsigned long)s->s2->tmp.conn_id_length;
 387         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 388                 {
 389                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_MESSAGE_TOO_LONG);
 390                 return -1;
 391                 }
 392         j = (int)len - s->init_num;
 393         i = ssl2_read(s,(char *)&(buf[s->init_num]),j);
 394         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 395         if (s->msg_callback)
 396                 s->msg_callback(0, s->version, 0, buf, (size_t)len, s, s->msg_callback_arg); /* SERVER-HELLO */
 397
 398         /* things are looking good */
 399
 400         p = buf + 11;
 401         if (s->hit)
 402                 {
 403                 if (s->s2->tmp.cert_length != 0)
 404                         {
 405                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
 406                         return(-1);
 407                         }
 408                 if (s->s2->tmp.cert_type != 0)
 409                         {
 410                         if (!(s->options &
 411                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
 412                                 {
 413                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
 414                                 return(-1);
 415                                 }
 416                         }
 417                 if (s->s2->tmp.csl != 0)
 418                         {
 419                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
 420                         return(-1);
 421                         }
 422                 }
 423         else
 424                 {
 425 #ifdef undef
 426                 /* very bad */
 427                 memset(s->session->session_id,0,
 428                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
 429                 s->session->session_id_length=0;
 430                 */
 431 #endif
 432
 433                 /* we need to do this in case we were trying to reuse a
 434                  * client session but others are already reusing it.
 435                  * If this was a new 'blank' session ID, the session-id
 436                  * length will still be 0 */
 437                 if (s->session->session_id_length > 0)
 438                         {
 439                         if (!ssl_get_new_session(s,0))
 440                                 {
 441                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 442                                 return(-1);
 443                                 }
 444                         }
 445
 446                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
 447                         s->s2->tmp.cert_length,p) <= 0)
 448                         {
 449                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 450                         return(-1);
 451                         }
 452                 p+=s->s2->tmp.cert_length;
 453
 454                 if (s->s2->tmp.csl == 0)
 455                         {
 456                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 457                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
 458                         return(-1);
 459                         }
 460
 461                 /* We have just received a list of ciphers back from the
 462                  * server.  We need to get the ones that match, then select
 463                  * the one we want the most :-). */
 464
 465                 /* load the ciphers */
 466                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
 467                                             &s->session->ciphers);
 468                 p+=s->s2->tmp.csl;
 469                 if (sk == NULL)
 470                         {
 471                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 472                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
 473                         return(-1);
 474                         }
 475
 476                 sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
 477
 478                 /* get the array of ciphers we will accept */
 479                 cl=SSL_get_ciphers(s);
 480                 sk_SSL_CIPHER_set_cmp_func(cl,ssl_cipher_ptr_id_cmp);
 481
 482                 /*
 483                  * If server preference flag set, choose the first
 484                  * (highest priority) cipher the server sends, otherwise
 485                  * client preference has priority.
 486                  */
 487                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
 488                     {
 489                     prio = sk;
 490                     allow = cl;
 491                     }
 492                 else
 493                     {
 494                     prio = cl;
 495                     allow = sk;
 496                     }
 497                 /* In theory we could have ciphers sent back that we
 498                  * don't want to use but that does not matter since we
 499                  * will check against the list we originally sent and
 500                  * for performance reasons we should not bother to match
 501                  * the two lists up just to check. */
 502                 for (i=0; i<sk_SSL_CIPHER_num(prio); i++)
 503                         {
 504                         if (sk_SSL_CIPHER_find(allow,
 505                                              sk_SSL_CIPHER_value(prio,i)) >= 0)
 506                                 break;
 507                         }
 508
 509                 if (i >= sk_SSL_CIPHER_num(prio))
 510                         {
 511                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 512                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
 513                         return(-1);
 514                         }
 515                 s->session->cipher=sk_SSL_CIPHER_value(prio,i);
 516
 517
 518                 if (s->session->peer != NULL) /* can't happen*/
 519                         {
 520                         ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
 521                         SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 522                         return(-1);
 523                         }
 524
 525                 s->session->peer = s->session->sess_cert->peer_key->x509;
 526                 /* peer_key->x509 has been set by ssl2_set_certificate. */
 527                 CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
 528                 }
 529
 530         if (s->session->peer != s->session->sess_cert->peer_key->x509)
 531                 /* can't happen */
 532                 {
 533                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
 534                 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 535                 return(-1);
 536                 }
 537
 538         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
 539         die(s->s2->conn_id_length <= sizeof s->s2->conn_id);
 540         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
 541         return(1);
 542         }
 543
 544 static int client_hello(SSL *s)
 545         {
 546         unsigned char *buf;
 547         unsigned char *p,*d;
 548 /*      CIPHER **cipher;*/
 549         int i,n,j;
 550
 551         buf=(unsigned char *)s->init_buf->data;
 552         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
 553                 {
 554                 if ((s->session == NULL) ||
 555                         (s->session->ssl_version != s->version))
 556                         {
 557                         if (!ssl_get_new_session(s,0))
 558                                 {
 559                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 560                                 return(-1);
 561                                 }
 562                         }
 563                 /* else use the pre-loaded session */
 564
 565                 p=buf;                                  /* header */
 566                 d=p+9;                                  /* data section */
 567                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
 568                 s2n(SSL2_VERSION,p);                    /* version */
 569                 n=j=0;
 570
 571                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d);
 572                 d+=n;
 573
 574                 if (n == 0)
 575                         {
 576                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 577                         return(-1);
 578                         }
 579
 580                 s2n(n,p);                       /* cipher spec num bytes */
 581
 582                 if ((s->session->session_id_length > 0) &&
 583                         (s->session->session_id_length <=
 584                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
 585                         {
 586                         i=s->session->session_id_length;
 587                         s2n(i,p);               /* session id length */
 588                         memcpy(d,s->session->session_id,(unsigned int)i);
 589                         d+=i;
 590                         }
 591                 else
 592                         {
 593                         s2n(0,p);
 594                         }
 595
 596                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
 597                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
 598                 /*challenge id data*/
 599                 RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 600                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 601                 d+=SSL2_CHALLENGE_LENGTH;
 602
 603                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
 604                 s->init_num=d-buf;
 605                 s->init_off=0;
 606                 }
 607         /* SSL2_ST_SEND_CLIENT_HELLO_B */
 608         return(ssl2_do_write(s));
 609         }
 610
 611 static int client_master_key(SSL *s)
 612         {
 613         unsigned char *buf;
 614         unsigned char *p,*d;
 615         int clear,enc,karg,i;
 616         SSL_SESSION *sess;
 617         const EVP_CIPHER *c;
 618         const EVP_MD *md;
 619
 620         buf=(unsigned char *)s->init_buf->data;
 621         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
 622                 {
 623
 624                 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
 625                         {
 626                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 627                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 628                         return(-1);
 629                         }
 630                 sess=s->session;
 631                 p=buf;
 632                 d=p+10;
 633                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
 634
 635                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
 636                 p+=i;
 637
 638                 /* make key_arg data */
 639                 i=EVP_CIPHER_iv_length(c);
 640                 sess->key_arg_length=i;
 641                 die(i <= SSL_MAX_KEY_ARG_LENGTH);
 642                 if (i > 0) RAND_pseudo_bytes(sess->key_arg,i);
 643
 644                 /* make a master key */
 645                 i=EVP_CIPHER_key_length(c);
 646                 sess->master_key_length=i;
 647                 if (i > 0)
 648                         {
 649                         die(i <= sizeof sess->master_key);
 650                         if (RAND_bytes(sess->master_key,i) <= 0)
 651                                 {
 652                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 653                                 return(-1);
 654                                 }
 655                         }
 656
 657                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 658                         enc=8;
 659                 else if (SSL_C_IS_EXPORT(sess->cipher))
 660                         enc=5;
 661                 else
 662                         enc=i;
 663
 664                 if (i < enc)
 665                         {
 666                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 667                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
 668                         return(-1);
 669                         }
 670                 clear=i-enc;
 671                 s2n(clear,p);
 672                 memcpy(d,sess->master_key,(unsigned int)clear);
 673                 d+=clear;
 674
 675                 enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
 676                         &(sess->master_key[clear]),d,
 677                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 678                 if (enc <= 0)
 679                         {
 680                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 681                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
 682                         return(-1);
 683                         }
 684 #ifdef PKCS1_CHECK
 685                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
 686                 if (s->options & SSL_OP_PKCS1_CHECK_2)
 687                         sess->master_key[clear]++;
 688 #endif
 689                 s2n(enc,p);
 690                 d+=enc;
 691                 karg=sess->key_arg_length;
 692                 s2n(karg,p); /* key arg size */
 693                 die(karg <= sizeof sess->key_arg);
 694                 memcpy(d,sess->key_arg,(unsigned int)karg);
 695                 d+=karg;
 696
 697                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
 698                 s->init_num=d-buf;
 699                 s->init_off=0;
 700                 }
 701
 702         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
 703         return(ssl2_do_write(s));
 704         }
 705
 706 static int client_finished(SSL *s)
 707         {
 708         unsigned char *p;
 709
 710         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
 711                 {
 712                 p=(unsigned char *)s->init_buf->data;
 713                 *(p++)=SSL2_MT_CLIENT_FINISHED;
 714                 die(s->s2->conn_id_length <= sizeof s->s2->conn_id);
 715                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
 716
 717                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
 718                 s->init_num=s->s2->conn_id_length+1;
 719                 s->init_off=0;
 720                 }
 721         return(ssl2_do_write(s));
 722         }
 723
 724 /* read the data and then respond */
 725 static int client_certificate(SSL *s)
 726         {
 727         unsigned char *buf;
 728         unsigned char *p,*d;
 729         int i;
 730         unsigned int n;
 731         int cert_ch_len;
 732         unsigned char *cert_ch;
 733
 734         buf=(unsigned char *)s->init_buf->data;
 735
 736         /* We have a cert associated with the SSL, so attach it to
 737          * the session if it does not have one */
 738
 739         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
 740                 {
 741                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
 742                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
 743                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
 744                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
 745                 s->init_num += i;
 746                 if (s->msg_callback)
 747                         s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* REQUEST-CERTIFICATE */
 748
 749                 /* type=buf[0]; */
 750                 /* type eq x509 */
 751                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 752                         {
 753                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 754                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
 755                         return(-1);
 756                         }
 757
 758                 if ((s->cert == NULL) ||
 759                         (s->cert->key->x509 == NULL) ||
 760                         (s->cert->key->privatekey == NULL))
 761                         {
 762                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
 763                         }
 764                 else
 765                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 766                 }
 767
 768         cert_ch = buf + 2;
 769         cert_ch_len = s->init_num - 2;
 770
 771         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
 772                 {
 773                 X509 *x509=NULL;
 774                 EVP_PKEY *pkey=NULL;
 775
 776                 /* If we get an error we need to
 777                  * ssl->rwstate=SSL_X509_LOOKUP;
 778                  * return(error);
 779                  * We should then be retried when things are ok and we
 780                  * can get a cert or not */
 781
 782                 i=0;
 783                 if (s->ctx->client_cert_cb != NULL)
 784                         {
 785                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
 786                         }
 787
 788                 if (i < 0)
 789                         {
 790                         s->rwstate=SSL_X509_LOOKUP;
 791                         return(-1);
 792                         }
 793                 s->rwstate=SSL_NOTHING;
 794
 795                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
 796                         {
 797                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 798                         if (    !SSL_use_certificate(s,x509) ||
 799                                 !SSL_use_PrivateKey(s,pkey))
 800                                 {
 801                                 i=0;
 802                                 }
 803                         X509_free(x509);
 804                         EVP_PKEY_free(pkey);
 805                         }
 806                 else if (i == 1)
 807                         {
 808                         if (x509 != NULL) X509_free(x509);
 809                         if (pkey != NULL) EVP_PKEY_free(pkey);
 810                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
 811                         i=0;
 812                         }
 813
 814                 if (i == 0)
 815                         {
 816                         /* We have no client certificate to respond with
 817                          * so send the correct error message back */
 818                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
 819                         p=buf;
 820                         *(p++)=SSL2_MT_ERROR;
 821                         s2n(SSL2_PE_NO_CERTIFICATE,p);
 822                         s->init_off=0;
 823                         s->init_num=3;
 824                         /* Write is done at the end */
 825                         }
 826                 }
 827
 828         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
 829                 {
 830                 return(ssl2_do_write(s));
 831                 }
 832
 833         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
 834                 {
 835                 EVP_MD_CTX ctx;
 836
 837                 /* ok, now we calculate the checksum
 838                  * do it first so we can reuse buf :-) */
 839                 p=buf;
 840                 EVP_MD_CTX_init(&ctx);
 841                 EVP_SignInit_ex(&ctx,s->ctx->rsa_md5, NULL);
 842                 EVP_SignUpdate(&ctx,s->s2->key_material,
 843                         (unsigned int)s->s2->key_material_length);
 844                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
 845                 n=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
 846                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
 847
 848                 p=buf;
 849                 d=p+6;
 850                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
 851                 *(p++)=SSL2_CT_X509_CERTIFICATE;
 852                 n=i2d_X509(s->cert->key->x509,&d);
 853                 s2n(n,p);
 854
 855                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
 856                         {
 857                         /* this is not good.  If things have failed it
 858                          * means there so something wrong with the key.
 859                          * We will continue with a 0 length signature
 860                          */
 861                         }
 862                 EVP_MD_CTX_cleanup(&ctx);
 863                 s2n(n,p);
 864                 d+=n;
 865
 866                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
 867                 s->init_num=d-buf;
 868                 s->init_off=0;
 869                 }
 870         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
 871         return(ssl2_do_write(s));
 872         }
 873
 874 static int get_server_verify(SSL *s)
 875         {
 876         unsigned char *p;
 877         int i, n, len;
 878
 879         p=(unsigned char *)s->init_buf->data;
 880         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
 881                 {
 882                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 883                 if (i < (1-s->init_num))
 884                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 885                 s->init_num += i;
 886
 887                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
 888                 if (*p != SSL2_MT_SERVER_VERIFY)
 889                         {
 890                         if (p[0] != SSL2_MT_ERROR)
 891                                 {
 892                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 893                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 894                                         SSL_R_READ_WRONG_PACKET_TYPE);
 895                                 }
 896                         else
 897                                 {
 898                                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_PEER_ERROR);
 899                                 /* try to read the error message */
 900                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
 901                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
 902                                 }
 903                         return(-1);
 904                         }
 905                 }
 906
 907         p=(unsigned char *)s->init_buf->data;
 908         len = 1 + s->s2->challenge_length;
 909         n =  len - s->init_num;
 910         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
 911         if (i < n)
 912                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 913         if (s->msg_callback)
 914                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* SERVER-VERIFY */
 915         p += 1;
 916
 917         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
 918                 {
 919                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 920                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
 921                 return(-1);
 922                 }
 923         return(1);
 924         }
 925
 926 static int get_server_finished(SSL *s)
 927         {
 928         unsigned char *buf;
 929         unsigned char *p;
 930         int i, n, len;
 931
 932         buf=(unsigned char *)s->init_buf->data;
 933         p=buf;
 934         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
 935                 {
 936                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
 937                 if (i < (1-s->init_num))
 938                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 939                 s->init_num += i;
 940
 941                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
 942                         {
 943                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
 944                         return(1);
 945                         }
 946                 else if (*p != SSL2_MT_SERVER_FINISHED)
 947                         {
 948                         if (p[0] != SSL2_MT_ERROR)
 949                                 {
 950                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 951                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 952                                 }
 953                         else
 954                                 {
 955                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
 956                                 /* try to read the error message */
 957                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
 958                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
 959                                 }
 960                         return(-1);
 961                         }
 962                 s->state=SSL2_ST_GET_SERVER_FINISHED_B;
 963                 }
 964
 965         len = 1 + SSL2_SSL_SESSION_ID_LENGTH;
 966         n = len - s->init_num;
 967         i = ssl2_read(s,(char *)&(buf[s->init_num]), n);
 968         if (i < n) /* XXX could be shorter than SSL2_SSL_SESSION_ID_LENGTH, that's the maximum */
 969                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 970         s->init_num += i;
 971         if (s->msg_callback)
 972                 s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* SERVER-FINISHED */
 973
 974         if (!s->hit) /* new session */
 975                 {
 976                 /* new session-id */
 977                 /* Make sure we were not trying to re-use an old SSL_SESSION
 978                  * or bad things can happen */
 979                 /* ZZZZZZZZZZZZZ */
 980                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
 981                 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH);
 982                 }
 983         else
 984                 {
 985                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
 986                         {
 987                         die(s->session->session_id_length
 988                             <= sizeof s->session->session_id);
 989                         if (memcmp(buf,s->session->session_id,
 990                                 (unsigned int)s->session->session_id_length) != 0)
 991                                 {
 992                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 993                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
 994                                 return(-1);
 995                                 }
 996                         }
 997                 }
 998         s->state = SSL_ST_OK;
 999         return(1);
1000         }
1001
1002 /* loads in the certificate from the server */
1003 int ssl2_set_certificate(SSL *s, int type, int len, unsigned char *data)
1004         {
1005         STACK_OF(X509) *sk=NULL;
1006         EVP_PKEY *pkey=NULL;
1007         SESS_CERT *sc=NULL;
1008         int i;
1009         X509 *x509=NULL;
1010         int ret=0;
1011
1012         x509=d2i_X509(NULL,&data,(long)len);
1013         if (x509 == NULL)
1014                 {
1015                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
1016                 goto err;
1017                 }
1018
1019         if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
1020                 {
1021                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1022                 goto err;
1023                 }
1024
1025         i=ssl_verify_cert_chain(s,sk);
1026
1027         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
1028                 {
1029                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1030                 goto err;
1031                 }
1032         ERR_clear_error(); /* but we keep s->verify_result */
1033         s->session->verify_result = s->verify_result;
1034
1035         /* server's cert for this session */
1036         sc=ssl_sess_cert_new();
1037         if (sc == NULL)
1038                 {
1039                 ret= -1;
1040                 goto err;
1041                 }
1042         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1043         s->session->sess_cert=sc;
1044
1045         sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
1046         sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);
1047
1048         pkey=X509_get_pubkey(x509);
1049         x509=NULL;
1050         if (pkey == NULL)
1051                 {
1052                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
1053                 goto err;
1054                 }
1055         if (pkey->type != EVP_PKEY_RSA)
1056                 {
1057                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
1058                 goto err;
1059                 }
1060
1061         if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
1062                 goto err;
1063         ret=1;
1064 err:
1065         sk_X509_free(sk);
1066         X509_free(x509);
1067         EVP_PKEY_free(pkey);
1068         return(ret);
1069         }
1070
1071 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
1072              unsigned char *to, int padding)
1073         {
1074         EVP_PKEY *pkey=NULL;
1075         int i= -1;
1076
1077         if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
1078                 ((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
1079                 {
1080                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
1081                 return(-1);
1082                 }
1083         if (pkey->type != EVP_PKEY_RSA)
1084                 {
1085                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1086                 goto end;
1087                 }
1088
1089         /* we have the public key */
1090         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
1091         if (i < 0)
1092                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
1093 end:
1094         EVP_PKEY_free(pkey);
1095         return(i);
1096         }
1097 #else /* !OPENSSL_NO_SSL2 */
1098
1099 # if PEDANTIC
1100 static void *dummy=&dummy;
1101 # endif
1102
1103 #endif