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 #include "ssl_locl.h"
  60 #ifndef OPENSSL_NO_SSL2
  61 #include <stdio.h>
  62 #include <openssl/rand.h>
  63 #include <openssl/buffer.h>
  64 #include <openssl/objects.h>
  65 #include <openssl/evp.h>
  66
  67 static SSL_METHOD *ssl2_get_client_method(int ver);
  68 static int get_server_finished(SSL *s);
  69 static int get_server_verify(SSL *s);
  70 static int get_server_hello(SSL *s);
  71 static int client_hello(SSL *s);
  72 static int client_master_key(SSL *s);
  73 static int client_finished(SSL *s);
  74 static int client_certificate(SSL *s);
  75 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
  76         unsigned char *to,int padding);
  77 #define BREAK   break
  78
  79 static SSL_METHOD *ssl2_get_client_method(int ver)
  80         {
  81         if (ver == SSL2_VERSION)
  82                 return(SSLv2_client_method());
  83         else
  84                 return(NULL);
  85         }
  86
  87 SSL_METHOD *SSLv2_client_method(void)
  88         {
  89         static int init=1;
  90         static SSL_METHOD SSLv2_client_data;
  91
  92         if (init)
  93                 {
  94                 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
  95                         sizeof(SSL_METHOD));
  96                 SSLv2_client_data.ssl_connect=ssl2_connect;
  97                 SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
  98                 init=0;
  99                 }
 100         return(&SSLv2_client_data);
 101         }
 102
 103 int ssl2_connect(SSL *s)
 104         {
 105         unsigned long l=time(NULL);
 106         BUF_MEM *buf=NULL;
 107         int ret= -1;
 108         void (*cb)()=NULL;
 109         int new_state,state;
 110
 111         RAND_add(&l,sizeof(l),0);
 112         ERR_clear_error();
 113         clear_sys_error();
 114
 115         if (s->info_callback != NULL)
 116                 cb=s->info_callback;
 117         else if (s->ctx->info_callback != NULL)
 118                 cb=s->ctx->info_callback;
 119
 120         /* init things to blank */
 121         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 122         s->in_handshake++;
 123
 124         for (;;)
 125                 {
 126                 state=s->state;
 127
 128                 switch (s->state)
 129                         {
 130                 case SSL_ST_BEFORE:
 131                 case SSL_ST_CONNECT:
 132                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 133                 case SSL_ST_OK|SSL_ST_CONNECT:
 134
 135                         s->server=0;
 136                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 137
 138                         s->version=SSL2_VERSION;
 139                         s->type=SSL_ST_CONNECT;
 140
 141                         buf=s->init_buf;
 142                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 143                                 {
 144                                 ret= -1;
 145                                 goto end;
 146                                 }
 147                         if (!BUF_MEM_grow(buf,
 148                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 149                                 {
 150                                 ret= -1;
 151                                 goto end;
 152                                 }
 153                         s->init_buf=buf;
 154                         s->init_num=0;
 155                         s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
 156                         s->ctx->stats.sess_connect++;
 157                         s->handshake_func=ssl2_connect;
 158                         BREAK;
 159
 160                 case SSL2_ST_SEND_CLIENT_HELLO_A:
 161                 case SSL2_ST_SEND_CLIENT_HELLO_B:
 162                         s->shutdown=0;
 163                         ret=client_hello(s);
 164                         if (ret <= 0) goto end;
 165                         s->init_num=0;
 166                         s->state=SSL2_ST_GET_SERVER_HELLO_A;
 167                         BREAK;
 168
 169                 case SSL2_ST_GET_SERVER_HELLO_A:
 170                 case SSL2_ST_GET_SERVER_HELLO_B:
 171                         ret=get_server_hello(s);
 172                         if (ret <= 0) goto end;
 173                         s->init_num=0;
 174                         if (!s->hit) /* new session */
 175                                 {
 176                                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
 177                                 BREAK;
 178                                 }
 179                         else
 180                                 {
 181                                 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 182                                 break;
 183                                 }
 184
 185                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
 186                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
 187                         ret=client_master_key(s);
 188                         if (ret <= 0) goto end;
 189                         s->init_num=0;
 190                         s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 191                         break;
 192
 193                 case SSL2_ST_CLIENT_START_ENCRYPTION:
 194                         /* Ok, we now have all the stuff needed to
 195                          * start encrypting, so lets fire it up :-) */
 196                         if (!ssl2_enc_init(s,1))
 197                                 {
 198                                 ret= -1;
 199                                 goto end;
 200                                 }
 201                         s->s2->clear_text=0;
 202                         s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
 203                         break;
 204
 205                 case SSL2_ST_SEND_CLIENT_FINISHED_A:
 206                 case SSL2_ST_SEND_CLIENT_FINISHED_B:
 207                         ret=client_finished(s);
 208                         if (ret <= 0) goto end;
 209                         s->init_num=0;
 210                         s->state=SSL2_ST_GET_SERVER_VERIFY_A;
 211                         break;
 212
 213                 case SSL2_ST_GET_SERVER_VERIFY_A:
 214                 case SSL2_ST_GET_SERVER_VERIFY_B:
 215                         ret=get_server_verify(s);
 216                         if (ret <= 0) goto end;
 217                         s->init_num=0;
 218                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 219                         break;
 220
 221                 case SSL2_ST_GET_SERVER_FINISHED_A:
 222                 case SSL2_ST_GET_SERVER_FINISHED_B:
 223                         ret=get_server_finished(s);
 224                         if (ret <= 0) goto end;
 225                         break;
 226
 227                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
 228                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
 229                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
 230                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
 231                 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
 232                         ret=client_certificate(s);
 233                         if (ret <= 0) goto end;
 234                         s->init_num=0;
 235                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 236                         break;
 237
 238                 case SSL_ST_OK:
 239                         if (s->init_buf != NULL)
 240                                 {
 241                                 BUF_MEM_free(s->init_buf);
 242                                 s->init_buf=NULL;
 243                                 }
 244                         s->init_num=0;
 245                 /*      ERR_clear_error();*/
 246
 247                         /* If we want to cache session-ids in the client
 248                          * and we successfully add the session-id to the
 249                          * cache, and there is a callback, then pass it out.
 250                          * 26/11/96 - eay - only add if not a re-used session.
 251                          */
 252
 253                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 254                         if (s->hit) s->ctx->stats.sess_hit++;
 255
 256                         ret=1;
 257                         /* s->server=0; */
 258                         s->ctx->stats.sess_connect_good++;
 259
 260                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 261
 262                         goto end;
 263                         /* break; */
 264                 default:
 265                         SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
 266                         return(-1);
 267                         /* break; */
 268                         }
 269
 270                 if ((cb != NULL) && (s->state != state))
 271                         {
 272                         new_state=s->state;
 273                         s->state=state;
 274                         cb(s,SSL_CB_CONNECT_LOOP,1);
 275                         s->state=new_state;
 276                         }
 277                 }
 278 end:
 279         s->in_handshake--;
 280         if (cb != NULL)
 281                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 282         return(ret);
 283         }
 284
 285 static int get_server_hello(SSL *s)
 286         {
 287         unsigned char *buf;
 288         unsigned char *p;
 289         int i,j;
 290         STACK_OF(SSL_CIPHER) *sk=NULL,*cl, *prio, *allow;
 291
 292         buf=(unsigned char *)s->init_buf->data;
 293         p=buf;
 294         if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
 295                 {
 296                 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
 297                 if (i < (11-s->init_num))
 298                         return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 299
 300                 if (*(p++) != SSL2_MT_SERVER_HELLO)
 301                         {
 302                         if (p[-1] != SSL2_MT_ERROR)
 303                                 {
 304                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 305                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 306                                         SSL_R_READ_WRONG_PACKET_TYPE);
 307                                 }
 308                         else
 309                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 310                                         SSL_R_PEER_ERROR);
 311                         return(-1);
 312                         }
 313 #ifdef __APPLE_CC__
 314                 /* The Rhapsody 5.5 (a.k.a. MacOS X) compiler bug
 315                  * workaround. <appro@fy.chalmers.se> */
 316                 s->hit=(i=*(p++))?1:0;
 317 #else
 318                 s->hit=(*(p++))?1:0;
 319 #endif
 320                 s->s2->tmp.cert_type= *(p++);
 321                 n2s(p,i);
 322                 if (i < s->version) s->version=i;
 323                 n2s(p,i); s->s2->tmp.cert_length=i;
 324                 n2s(p,i); s->s2->tmp.csl=i;
 325                 n2s(p,i); s->s2->tmp.conn_id_length=i;
 326                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
 327                 s->init_num=0;
 328                 }
 329
 330         /* SSL2_ST_GET_SERVER_HELLO_B */
 331         j=s->s2->tmp.cert_length+s->s2->tmp.csl+s->s2->tmp.conn_id_length
 332                 - s->init_num;
 333         i=ssl2_read(s,(char *)&(buf[s->init_num]),j);
 334         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 335
 336         /* things are looking good */
 337
 338         p=buf;
 339         if (s->hit)
 340                 {
 341                 if (s->s2->tmp.cert_length != 0)
 342                         {
 343                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
 344                         return(-1);
 345                         }
 346                 if (s->s2->tmp.cert_type != 0)
 347                         {
 348                         if (!(s->options &
 349                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
 350                                 {
 351                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
 352                                 return(-1);
 353                                 }
 354                         }
 355                 if (s->s2->tmp.csl != 0)
 356                         {
 357                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
 358                         return(-1);
 359                         }
 360                 }
 361         else
 362                 {
 363 #ifdef undef
 364                 /* very bad */
 365                 memset(s->session->session_id,0,
 366                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
 367                 s->session->session_id_length=0;
 368                 */
 369 #endif
 370
 371                 /* we need to do this in case we were trying to reuse a
 372                  * client session but others are already reusing it.
 373                  * If this was a new 'blank' session ID, the session-id
 374                  * length will still be 0 */
 375                 if (s->session->session_id_length > 0)
 376                         {
 377                         if (!ssl_get_new_session(s,0))
 378                                 {
 379                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 380                                 return(-1);
 381                                 }
 382                         }
 383
 384                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
 385                         s->s2->tmp.cert_length,p) <= 0)
 386                         {
 387                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 388                         return(-1);
 389                         }
 390                 p+=s->s2->tmp.cert_length;
 391
 392                 if (s->s2->tmp.csl == 0)
 393                         {
 394                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 395                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
 396                         return(-1);
 397                         }
 398
 399                 /* We have just received a list of ciphers back from the
 400                  * server.  We need to get the ones that match, then select
 401                  * the one we want the most :-). */
 402
 403                 /* load the ciphers */
 404                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
 405                                             &s->session->ciphers);
 406                 p+=s->s2->tmp.csl;
 407                 if (sk == NULL)
 408                         {
 409                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 410                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
 411                         return(-1);
 412                         }
 413
 414                 sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
 415
 416                 /* get the array of ciphers we will accept */
 417                 cl=SSL_get_ciphers(s);
 418                 sk_SSL_CIPHER_set_cmp_func(cl,ssl_cipher_ptr_id_cmp);
 419
 420                 /*
 421                  * If server preference flag set, choose the first
 422                  * (highest priority) cipher the server sends, otherwise
 423                  * client preference has priority.
 424                  */
 425                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
 426                     {
 427                     prio = sk;
 428                     allow = cl;
 429                     }
 430                 else
 431                     {
 432                     prio = cl;
 433                     allow = sk;
 434                     }
 435                 /* In theory we could have ciphers sent back that we
 436                  * don't want to use but that does not matter since we
 437                  * will check against the list we originally sent and
 438                  * for performance reasons we should not bother to match
 439                  * the two lists up just to check. */
 440                 for (i=0; i<sk_SSL_CIPHER_num(prio); i++)
 441                         {
 442                         if (sk_SSL_CIPHER_find(allow,
 443                                              sk_SSL_CIPHER_value(prio,i)) >= 0)
 444                                 break;
 445                         }
 446
 447                 if (i >= sk_SSL_CIPHER_num(prio))
 448                         {
 449                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 450                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
 451                         return(-1);
 452                         }
 453                 s->session->cipher=sk_SSL_CIPHER_value(prio,i);
 454
 455
 456                 if (s->session->peer != NULL) /* can't happen*/
 457                         {
 458                         ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
 459                         SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 460                         return(-1);
 461                         }
 462
 463                 s->session->peer = s->session->sess_cert->peer_key->x509;
 464                 /* peer_key->x509 has been set by ssl2_set_certificate. */
 465                 CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
 466                 }
 467
 468         if (s->session->peer != s->session->sess_cert->peer_key->x509)
 469                 /* can't happen */
 470                 {
 471                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
 472                 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 473                 return(-1);
 474                 }
 475
 476         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
 477         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
 478         return(1);
 479         }
 480
 481 static int client_hello(SSL *s)
 482         {
 483         unsigned char *buf;
 484         unsigned char *p,*d;
 485 /*      CIPHER **cipher;*/
 486         int i,n,j;
 487
 488         buf=(unsigned char *)s->init_buf->data;
 489         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
 490                 {
 491                 if ((s->session == NULL) ||
 492                         (s->session->ssl_version != s->version))
 493                         {
 494                         if (!ssl_get_new_session(s,0))
 495                                 {
 496                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 497                                 return(-1);
 498                                 }
 499                         }
 500                 /* else use the pre-loaded session */
 501
 502                 p=buf;                                  /* header */
 503                 d=p+9;                                  /* data section */
 504                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
 505                 s2n(SSL2_VERSION,p);                    /* version */
 506                 n=j=0;
 507
 508                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d);
 509                 d+=n;
 510
 511                 if (n == 0)
 512                         {
 513                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 514                         return(-1);
 515                         }
 516
 517                 s2n(n,p);                       /* cipher spec num bytes */
 518
 519                 if ((s->session->session_id_length > 0) &&
 520                         (s->session->session_id_length <=
 521                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
 522                         {
 523                         i=s->session->session_id_length;
 524                         s2n(i,p);               /* session id length */
 525                         memcpy(d,s->session->session_id,(unsigned int)i);
 526                         d+=i;
 527                         }
 528                 else
 529                         {
 530                         s2n(0,p);
 531                         }
 532
 533                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
 534                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
 535                 /*challenge id data*/
 536                 RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 537                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 538                 d+=SSL2_CHALLENGE_LENGTH;
 539
 540                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
 541                 s->init_num=d-buf;
 542                 s->init_off=0;
 543                 }
 544         /* SSL2_ST_SEND_CLIENT_HELLO_B */
 545         return(ssl2_do_write(s));
 546         }
 547
 548 static int client_master_key(SSL *s)
 549         {
 550         unsigned char *buf;
 551         unsigned char *p,*d;
 552         int clear,enc,karg,i;
 553         SSL_SESSION *sess;
 554         const EVP_CIPHER *c;
 555         const EVP_MD *md;
 556
 557         buf=(unsigned char *)s->init_buf->data;
 558         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
 559                 {
 560
 561                 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
 562                         {
 563                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 564                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 565                         return(-1);
 566                         }
 567                 sess=s->session;
 568                 p=buf;
 569                 d=p+10;
 570                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
 571
 572                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
 573                 p+=i;
 574
 575                 /* make key_arg data */
 576                 i=EVP_CIPHER_iv_length(c);
 577                 sess->key_arg_length=i;
 578                 if (i > 0) RAND_pseudo_bytes(sess->key_arg,i);
 579
 580                 /* make a master key */
 581                 i=EVP_CIPHER_key_length(c);
 582                 sess->master_key_length=i;
 583                 if (i > 0)
 584                         {
 585                         if (RAND_bytes(sess->master_key,i) <= 0)
 586                                 {
 587                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 588                                 return(-1);
 589                                 }
 590                         }
 591
 592                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 593                         enc=8;
 594                 else if (SSL_C_IS_EXPORT(sess->cipher))
 595                         enc=5;
 596                 else
 597                         enc=i;
 598
 599                 if (i < enc)
 600                         {
 601                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 602                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
 603                         return(-1);
 604                         }
 605                 clear=i-enc;
 606                 s2n(clear,p);
 607                 memcpy(d,sess->master_key,(unsigned int)clear);
 608                 d+=clear;
 609
 610                 enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
 611                         &(sess->master_key[clear]),d,
 612                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 613                 if (enc <= 0)
 614                         {
 615                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 616                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
 617                         return(-1);
 618                         }
 619 #ifdef PKCS1_CHECK
 620                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
 621                 if (s->options & SSL_OP_PKCS1_CHECK_2)
 622                         sess->master_key[clear]++;
 623 #endif
 624                 s2n(enc,p);
 625                 d+=enc;
 626                 karg=sess->key_arg_length;
 627                 s2n(karg,p); /* key arg size */
 628                 memcpy(d,sess->key_arg,(unsigned int)karg);
 629                 d+=karg;
 630
 631                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
 632                 s->init_num=d-buf;
 633                 s->init_off=0;
 634                 }
 635
 636         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
 637         return(ssl2_do_write(s));
 638         }
 639
 640 static int client_finished(SSL *s)
 641         {
 642         unsigned char *p;
 643
 644         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
 645                 {
 646                 p=(unsigned char *)s->init_buf->data;
 647                 *(p++)=SSL2_MT_CLIENT_FINISHED;
 648                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
 649
 650                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
 651                 s->init_num=s->s2->conn_id_length+1;
 652                 s->init_off=0;
 653                 }
 654         return(ssl2_do_write(s));
 655         }
 656
 657 /* read the data and then respond */
 658 static int client_certificate(SSL *s)
 659         {
 660         unsigned char *buf;
 661         unsigned char *p,*d;
 662         int i;
 663         unsigned int n;
 664         int cert_ch_len=0;
 665         unsigned char *cert_ch;
 666
 667         buf=(unsigned char *)s->init_buf->data;
 668         cert_ch= &(buf[2]);
 669
 670         /* We have a cert associated with the SSL, so attach it to
 671          * the session if it does not have one */
 672
 673         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
 674                 {
 675                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
 676                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
 677                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
 678                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
 679
 680                 /* type=buf[0]; */
 681                 /* type eq x509 */
 682                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 683                         {
 684                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 685                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
 686                         return(-1);
 687                         }
 688                 cert_ch_len=i-1;
 689
 690                 if ((s->cert == NULL) ||
 691                         (s->cert->key->x509 == NULL) ||
 692                         (s->cert->key->privatekey == NULL))
 693                         {
 694                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
 695                         }
 696                 else
 697                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 698                 }
 699
 700         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
 701                 {
 702                 X509 *x509=NULL;
 703                 EVP_PKEY *pkey=NULL;
 704
 705                 /* If we get an error we need to
 706                  * ssl->rwstate=SSL_X509_LOOKUP;
 707                  * return(error);
 708                  * We should then be retried when things are ok and we
 709                  * can get a cert or not */
 710
 711                 i=0;
 712                 if (s->ctx->client_cert_cb != NULL)
 713                         {
 714                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
 715                         }
 716
 717                 if (i < 0)
 718                         {
 719                         s->rwstate=SSL_X509_LOOKUP;
 720                         return(-1);
 721                         }
 722                 s->rwstate=SSL_NOTHING;
 723
 724                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
 725                         {
 726                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 727                         if (    !SSL_use_certificate(s,x509) ||
 728                                 !SSL_use_PrivateKey(s,pkey))
 729                                 {
 730                                 i=0;
 731                                 }
 732                         X509_free(x509);
 733                         EVP_PKEY_free(pkey);
 734                         }
 735                 else if (i == 1)
 736                         {
 737                         if (x509 != NULL) X509_free(x509);
 738                         if (pkey != NULL) EVP_PKEY_free(pkey);
 739                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
 740                         i=0;
 741                         }
 742
 743                 if (i == 0)
 744                         {
 745                         /* We have no client certificate to respond with
 746                          * so send the correct error message back */
 747                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
 748                         p=buf;
 749                         *(p++)=SSL2_MT_ERROR;
 750                         s2n(SSL2_PE_NO_CERTIFICATE,p);
 751                         s->init_off=0;
 752                         s->init_num=3;
 753                         /* Write is done at the end */
 754                         }
 755                 }
 756
 757         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
 758                 {
 759                 return(ssl2_do_write(s));
 760                 }
 761
 762         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
 763                 {
 764                 EVP_MD_CTX ctx;
 765
 766                 /* ok, now we calculate the checksum
 767                  * do it first so we can reuse buf :-) */
 768                 p=buf;
 769                 EVP_SignInit(&ctx,s->ctx->rsa_md5);
 770                 EVP_SignUpdate(&ctx,s->s2->key_material,
 771                         (unsigned int)s->s2->key_material_length);
 772                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
 773                 n=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
 774                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
 775
 776                 p=buf;
 777                 d=p+6;
 778                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
 779                 *(p++)=SSL2_CT_X509_CERTIFICATE;
 780                 n=i2d_X509(s->cert->key->x509,&d);
 781                 s2n(n,p);
 782
 783                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
 784                         {
 785                         /* this is not good.  If things have failed it
 786                          * means there so something wrong with the key.
 787                          * We will continue with a 0 length signature
 788                          */
 789                         }
 790                 memset(&ctx,0,sizeof(ctx));
 791                 s2n(n,p);
 792                 d+=n;
 793
 794                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
 795                 s->init_num=d-buf;
 796                 s->init_off=0;
 797                 }
 798         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
 799         return(ssl2_do_write(s));
 800         }
 801
 802 static int get_server_verify(SSL *s)
 803         {
 804         unsigned char *p;
 805         int i;
 806
 807         p=(unsigned char *)s->init_buf->data;
 808         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
 809                 {
 810                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 811                 if (i < (1-s->init_num))
 812                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 813
 814                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
 815                 s->init_num=0;
 816                 if (*p != SSL2_MT_SERVER_VERIFY)
 817                         {
 818                         if (p[0] != SSL2_MT_ERROR)
 819                                 {
 820                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 821                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 822                                         SSL_R_READ_WRONG_PACKET_TYPE);
 823                                 }
 824                         else
 825                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 826                                         SSL_R_PEER_ERROR);
 827                         return(-1);
 828                         }
 829                 }
 830
 831         p=(unsigned char *)s->init_buf->data;
 832         i=ssl2_read(s,(char *)&(p[s->init_num]),
 833                 (unsigned int)s->s2->challenge_length-s->init_num);
 834         if (i < ((int)s->s2->challenge_length-s->init_num))
 835                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 836         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
 837                 {
 838                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 839                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
 840                 return(-1);
 841                 }
 842         return(1);
 843         }
 844
 845 static int get_server_finished(SSL *s)
 846         {
 847         unsigned char *buf;
 848         unsigned char *p;
 849         int i;
 850
 851         buf=(unsigned char *)s->init_buf->data;
 852         p=buf;
 853         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
 854                 {
 855                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
 856                 if (i < (1-s->init_num))
 857                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 858                 s->init_num=i;
 859                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
 860                         {
 861                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
 862                         return(1);
 863                         }
 864                 else if (*p != SSL2_MT_SERVER_FINISHED)
 865                         {
 866                         if (p[0] != SSL2_MT_ERROR)
 867                                 {
 868                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 869                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 870                                 }
 871                         else
 872                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
 873                         return(-1);
 874                         }
 875                 s->state=SSL_ST_OK;
 876                 s->init_num=0;
 877                 }
 878
 879         i=ssl2_read(s,(char *)&(buf[s->init_num]),
 880                 SSL2_SSL_SESSION_ID_LENGTH-s->init_num);
 881         if (i < (SSL2_SSL_SESSION_ID_LENGTH-s->init_num))
 882                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 883
 884         if (!s->hit) /* new session */
 885                 {
 886                 /* new session-id */
 887                 /* Make sure we were not trying to re-use an old SSL_SESSION
 888                  * or bad things can happen */
 889                 /* ZZZZZZZZZZZZZ */
 890                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
 891                 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH);
 892                 }
 893         else
 894                 {
 895                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
 896                         {
 897                         if (memcmp(buf,s->session->session_id,
 898                                 (unsigned int)s->session->session_id_length) != 0)
 899                                 {
 900                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 901                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
 902                                 return(-1);
 903                                 }
 904                         }
 905                 }
 906         return(1);
 907         }
 908
 909 /* loads in the certificate from the server */
 910 int ssl2_set_certificate(SSL *s, int type, int len, unsigned char *data)
 911         {
 912         STACK_OF(X509) *sk=NULL;
 913         EVP_PKEY *pkey=NULL;
 914         SESS_CERT *sc=NULL;
 915         int i;
 916         X509 *x509=NULL;
 917         int ret=0;
 918
 919         x509=d2i_X509(NULL,&data,(long)len);
 920         if (x509 == NULL)
 921                 {
 922                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
 923                 goto err;
 924                 }
 925
 926         if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
 927                 {
 928                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 929                 goto err;
 930                 }
 931
 932         i=ssl_verify_cert_chain(s,sk);
 933
 934         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 935                 {
 936                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 937                 goto err;
 938                 }
 939         ERR_clear_error(); /* but we keep s->verify_result */
 940         s->session->verify_result = s->verify_result;
 941
 942         /* server's cert for this session */
 943         sc=ssl_sess_cert_new();
 944         if (sc == NULL)
 945                 {
 946                 ret= -1;
 947                 goto err;
 948                 }
 949         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 950         s->session->sess_cert=sc;
 951
 952         sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
 953         sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);
 954
 955         pkey=X509_get_pubkey(x509);
 956         x509=NULL;
 957         if (pkey == NULL)
 958                 {
 959                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
 960                 goto err;
 961                 }
 962         if (pkey->type != EVP_PKEY_RSA)
 963                 {
 964                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
 965                 goto err;
 966                 }
 967
 968         if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
 969                 goto err;
 970         ret=1;
 971 err:
 972         sk_X509_free(sk);
 973         X509_free(x509);
 974         EVP_PKEY_free(pkey);
 975         return(ret);
 976         }
 977
 978 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
 979              unsigned char *to, int padding)
 980         {
 981         EVP_PKEY *pkey=NULL;
 982         int i= -1;
 983
 984         if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
 985                 ((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
 986                 {
 987                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
 988                 return(-1);
 989                 }
 990         if (pkey->type != EVP_PKEY_RSA)
 991                 {
 992                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 993                 goto end;
 994                 }
 995
 996         /* we have the public key */
 997         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
 998         if (i < 0)
 999                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
1000 end:
1001         EVP_PKEY_free(pkey);
1002         return(i);
1003         }
1004 #else /* !OPENSSL_NO_SSL2 */
1005
1006 # if PEDANTIC
1007 static void *dummy=&dummy;
1008 # endif
1009
1010 #endif