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 <stdio.h>
  60 #include "rand.h"
  61 #include "buffer.h"
  62 #include "objects.h"
  63 #include "ssl_locl.h"
  64 #include "evp.h"
  65
  66 #ifndef NOPROTO
  67 static int get_server_finished(SSL *s);
  68 static int get_server_verify(SSL *s);
  69 static int get_server_hello(SSL *s);
  70 static int client_hello(SSL *s);
  71 static int client_master_key(SSL *s);
  72 static int client_finished(SSL *s);
  73 static int client_certificate(SSL *s);
  74 static int ssl_rsa_public_encrypt(CERT *c, int len, unsigned char *from,
  75         unsigned char *to,int padding);
  76 #else
  77 static int get_server_finished();
  78 static int get_server_verify();
  79 static int get_server_hello();
  80 static int client_hello();
  81 static int client_master_key();
  82 static int client_finished();
  83 static int client_certificate();
  84 static int ssl_rsa_public_encrypt();
  85 #endif
  86
  87 #define BREAK   break
  88
  89 static SSL_METHOD *ssl2_get_client_method(ver)
  90 int ver;
  91         {
  92         if (ver == SSL2_VERSION)
  93                 return(SSLv2_client_method());
  94         else
  95                 return(NULL);
  96         }
  97
  98 SSL_METHOD *SSLv2_client_method()
  99         {
 100         static int init=1;
 101         static SSL_METHOD SSLv2_client_data;
 102
 103         if (init)
 104                 {
 105                 init=0;
 106                 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
 107                         sizeof(SSL_METHOD));
 108                 SSLv2_client_data.ssl_connect=ssl2_connect;
 109                 SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
 110                 }
 111         return(&SSLv2_client_data);
 112         }
 113
 114 int ssl2_connect(s)
 115 SSL *s;
 116         {
 117         unsigned long l=time(NULL);
 118         BUF_MEM *buf=NULL;
 119         int ret= -1;
 120         void (*cb)()=NULL;
 121         int new_state,state;
 122
 123         RAND_seed((unsigned char *)&l,sizeof(l));
 124         ERR_clear_error();
 125         clear_sys_error();
 126
 127         if (s->info_callback != NULL)
 128                 cb=s->info_callback;
 129         else if (s->ctx->info_callback != NULL)
 130                 cb=s->ctx->info_callback;
 131
 132         /* init things to blank */
 133         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 134         s->in_handshake++;
 135
 136         for (;;)
 137                 {
 138                 state=s->state;
 139
 140                 switch (s->state)
 141                         {
 142                 case SSL_ST_BEFORE:
 143                 case SSL_ST_CONNECT:
 144                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 145                 case SSL_ST_OK|SSL_ST_CONNECT:
 146
 147                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 148
 149                         s->version=SSL2_VERSION;
 150                         s->type=SSL_ST_CONNECT;
 151
 152                         buf=s->init_buf;
 153                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 154                                 {
 155                                 ret= -1;
 156                                 goto end;
 157                                 }
 158                         if (!BUF_MEM_grow(buf,
 159                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 160                                 {
 161                                 ret= -1;
 162                                 goto end;
 163                                 }
 164                         s->init_buf=buf;
 165                         s->init_num=0;
 166                         s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
 167                         s->ctx->sess_connect++;
 168                         s->handshake_func=ssl2_connect;
 169                         BREAK;
 170
 171                 case SSL2_ST_SEND_CLIENT_HELLO_A:
 172                 case SSL2_ST_SEND_CLIENT_HELLO_B:
 173                         s->shutdown=0;
 174                         ret=client_hello(s);
 175                         if (ret <= 0) goto end;
 176                         s->init_num=0;
 177                         s->state=SSL2_ST_GET_SERVER_HELLO_A;
 178                         BREAK;
 179
 180                 case SSL2_ST_GET_SERVER_HELLO_A:
 181                 case SSL2_ST_GET_SERVER_HELLO_B:
 182                         ret=get_server_hello(s);
 183                         if (ret <= 0) goto end;
 184                         s->init_num=0;
 185                         if (!s->hit) /* new session */
 186                                 {
 187                                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
 188                                 BREAK;
 189                                 }
 190                         else
 191                                 {
 192                                 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 193                                 break;
 194                                 }
 195
 196                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
 197                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
 198                         ret=client_master_key(s);
 199                         if (ret <= 0) goto end;
 200                         s->init_num=0;
 201                         s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 202                         break;
 203
 204                 case SSL2_ST_CLIENT_START_ENCRYPTION:
 205                         /* Ok, we now have all the stuff needed to
 206                          * start encrypting, so lets fire it up :-) */
 207                         if (!ssl2_enc_init(s,1))
 208                                 {
 209                                 ret= -1;
 210                                 goto end;
 211                                 }
 212                         s->s2->clear_text=0;
 213                         s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
 214                         break;
 215
 216                 case SSL2_ST_SEND_CLIENT_FINISHED_A:
 217                 case SSL2_ST_SEND_CLIENT_FINISHED_B:
 218                         ret=client_finished(s);
 219                         if (ret <= 0) goto end;
 220                         s->init_num=0;
 221                         s->state=SSL2_ST_GET_SERVER_VERIFY_A;
 222                         break;
 223
 224                 case SSL2_ST_GET_SERVER_VERIFY_A:
 225                 case SSL2_ST_GET_SERVER_VERIFY_B:
 226                         ret=get_server_verify(s);
 227                         if (ret <= 0) goto end;
 228                         s->init_num=0;
 229                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 230                         break;
 231
 232                 case SSL2_ST_GET_SERVER_FINISHED_A:
 233                 case SSL2_ST_GET_SERVER_FINISHED_B:
 234                         ret=get_server_finished(s);
 235                         if (ret <= 0) goto end;
 236                         break;
 237
 238                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
 239                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
 240                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
 241                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
 242                 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
 243                         ret=client_certificate(s);
 244                         if (ret <= 0) goto end;
 245                         s->init_num=0;
 246                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 247                         break;
 248
 249                 case SSL_ST_OK:
 250                         BUF_MEM_free(s->init_buf);
 251                         s->init_buf=NULL;
 252                         s->init_num=0;
 253                 /*      ERR_clear_error();*/
 254
 255                         /* If we want to cache session-ids in the client
 256                          * and we sucessfully add the session-id to the
 257                          * cache, and there is a callback, then pass it out.
 258                          * 26/11/96 - eay - only add if not a re-used session.
 259                          */
 260
 261                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 262                         if (s->hit) s->ctx->sess_hit++;
 263
 264                         ret=1;
 265                         /* s->server=0; */
 266                         s->ctx->sess_connect_good++;
 267
 268                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 269
 270                         goto end;
 271                         /* break; */
 272                 default:
 273                         SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
 274                         return(-1);
 275                         /* break; */
 276                         }
 277
 278                 if ((cb != NULL) && (s->state != state))
 279                         {
 280                         new_state=s->state;
 281                         s->state=state;
 282                         cb(s,SSL_CB_CONNECT_LOOP,1);
 283                         s->state=new_state;
 284                         }
 285                 }
 286 end:
 287         s->in_handshake--;
 288         if (cb != NULL)
 289                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 290         return(ret);
 291         }
 292
 293 static int get_server_hello(s)
 294 SSL *s;
 295         {
 296         unsigned char *buf;
 297         unsigned char *p;
 298         int i,j;
 299         STACK *sk=NULL,*cl;
 300
 301         buf=(unsigned char *)s->init_buf->data;
 302         p=buf;
 303         if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
 304                 {
 305                 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
 306                 if (i < (11-s->init_num))
 307                         return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 308
 309                 if (*(p++) != SSL2_MT_SERVER_HELLO)
 310                         {
 311                         if (p[-1] != SSL2_MT_ERROR)
 312                                 {
 313                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 314                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 315                                         SSL_R_READ_WRONG_PACKET_TYPE);
 316                                 }
 317                         else
 318                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 319                                         SSL_R_PEER_ERROR);
 320                         return(-1);
 321                         }
 322                 s->hit=(*(p++))?1:0;
 323                 s->s2->tmp.cert_type= *(p++);
 324                 n2s(p,i);
 325                 if (i < s->version) s->version=i;
 326                 n2s(p,i); s->s2->tmp.cert_length=i;
 327                 n2s(p,i); s->s2->tmp.csl=i;
 328                 n2s(p,i); s->s2->tmp.conn_id_length=i;
 329                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
 330                 s->init_num=0;
 331                 }
 332
 333         /* SSL2_ST_GET_SERVER_HELLO_B */
 334         j=s->s2->tmp.cert_length+s->s2->tmp.csl+s->s2->tmp.conn_id_length
 335                 - s->init_num;
 336         i=ssl2_read(s,(char *)&(buf[s->init_num]),j);
 337         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 338
 339         /* things are looking good */
 340
 341         p=buf;
 342         if (s->hit)
 343                 {
 344                 if (s->s2->tmp.cert_length != 0)
 345                         {
 346                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
 347                         return(-1);
 348                         }
 349                 if (s->s2->tmp.cert_type != 0)
 350                         {
 351                         if (!(s->options &
 352                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
 353                                 {
 354                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
 355                                 return(-1);
 356                                 }
 357                         }
 358                 if (s->s2->tmp.csl != 0)
 359                         {
 360                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
 361                         return(-1);
 362                         }
 363                 }
 364         else
 365                 {
 366 #ifdef undef
 367                 /* very bad */
 368                 memset(s->session->session_id,0,
 369                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
 370                 s->session->session_id_length=0;
 371                 */
 372 #endif
 373
 374                 /* we need to do this incase we were trying to reuse a
 375                  * client session but others are already reusing it.
 376                  * If this was a new 'blank' session ID, the session-id
 377                  * length will still be 0 */
 378                 if (s->session->session_id_length > 0)
 379                         {
 380                         if (!ssl_get_new_session(s,0))
 381                                 {
 382                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 383                                 return(-1);
 384                                 }
 385                         }
 386
 387                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
 388                         s->s2->tmp.cert_length,p) <= 0)
 389                         {
 390                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 391                         return(-1);
 392                         }
 393                 p+=s->s2->tmp.cert_length;
 394
 395                 if (s->s2->tmp.csl == 0)
 396                         {
 397                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 398                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
 399                         return(-1);
 400                         }
 401
 402                 /* We have just received a list of ciphers back from the
 403                  * server.  We need to get the ones that match, then select
 404                  * the one we want the most :-). */
 405
 406                 /* load the ciphers */
 407                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
 408                         &s->session->ciphers);
 409                 p+=s->s2->tmp.csl;
 410                 if (sk == NULL)
 411                         {
 412                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 413                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
 414                         return(-1);
 415                         }
 416
 417                 sk_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
 418
 419                 /* get the array of ciphers we will accept */
 420                 cl=ssl_get_ciphers_by_id(s);
 421
 422                 /* In theory we could have ciphers sent back that we
 423                  * don't want to use but that does not matter since we
 424                  * will check against the list we origionally sent and
 425                  * for performance reasons we should not bother to match
 426                  * the two lists up just to check. */
 427                 for (i=0; i<sk_num(cl); i++)
 428                         {
 429                         if (sk_find(sk,sk_value(cl,i)) >= 0)
 430                                 break;
 431                         }
 432
 433                 if (i >= sk_num(cl))
 434                         {
 435                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 436                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
 437                         return(-1);
 438                         }
 439                 s->session->cipher=(SSL_CIPHER *)sk_value(cl,i);
 440                 }
 441
 442         if ((s->session != NULL) && (s->session->peer != NULL))
 443                 X509_free(s->session->peer);
 444
 445         /* hmmm, can we have the problem of the other session with this
 446          * cert, Free's it before we increment the reference count. */
 447         CRYPTO_w_lock(CRYPTO_LOCK_X509);
 448         s->session->peer=s->session->cert->key->x509;
 449         CRYPTO_add(&s->session->peer->references,1,CRYPTO_LOCK_X509);
 450         CRYPTO_w_unlock(CRYPTO_LOCK_X509);
 451
 452         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
 453         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
 454         return(1);
 455         }
 456
 457 static int client_hello(s)
 458 SSL *s;
 459         {
 460         unsigned char *buf;
 461         unsigned char *p,*d;
 462 /*      CIPHER **cipher;*/
 463         int i,n,j;
 464
 465         buf=(unsigned char *)s->init_buf->data;
 466         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
 467                 {
 468                 if ((s->session == NULL) ||
 469                         (s->session->ssl_version != s->version))
 470                         {
 471                         if (!ssl_get_new_session(s,0))
 472                                 {
 473                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 474                                 return(-1);
 475                                 }
 476                         }
 477                 /* else use the pre-loaded session */
 478
 479                 p=buf;                                  /* header */
 480                 d=p+9;                                  /* data section */
 481                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
 482                 s2n(SSL2_CLIENT_VERSION,p);             /* version */
 483                 n=j=0;
 484
 485                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d);
 486                 d+=n;
 487
 488                 if (n == 0)
 489                         {
 490                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 491                         return(-1);
 492                         }
 493
 494                 s2n(n,p);                       /* cipher spec num bytes */
 495
 496                 if ((s->session->session_id_length > 0) &&
 497                         (s->session->session_id_length <=
 498                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
 499                         {
 500                         i=s->session->session_id_length;
 501                         s2n(i,p);               /* session id length */
 502                         memcpy(d,s->session->session_id,(unsigned int)i);
 503                         d+=i;
 504                         }
 505                 else
 506                         {
 507                         s2n(0,p);
 508                         }
 509
 510                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
 511                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
 512                 /*challenge id data*/
 513                 RAND_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 514                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 515                 d+=SSL2_CHALLENGE_LENGTH;
 516
 517                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
 518                 s->init_num=d-buf;
 519                 s->init_off=0;
 520                 }
 521         /* SSL2_ST_SEND_CLIENT_HELLO_B */
 522         return(ssl2_do_write(s));
 523         }
 524
 525 static int client_master_key(s)
 526 SSL *s;
 527         {
 528         unsigned char *buf;
 529         unsigned char *p,*d;
 530         int clear,enc,karg,i;
 531         SSL_SESSION *sess;
 532         EVP_CIPHER *c;
 533         EVP_MD *md;
 534
 535         buf=(unsigned char *)s->init_buf->data;
 536         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
 537                 {
 538
 539                 if (!ssl_cipher_get_evp(s->session->cipher,&c,&md))
 540                         {
 541                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 542                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 543                         return(-1);
 544                         }
 545                 sess=s->session;
 546                 p=buf;
 547                 d=p+10;
 548                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
 549
 550                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
 551                 p+=i;
 552
 553                 /* make key_arg data */
 554                 i=EVP_CIPHER_iv_length(c);
 555                 sess->key_arg_length=i;
 556                 if (i > 0) RAND_bytes(sess->key_arg,i);
 557
 558                 /* make a master key */
 559                 i=EVP_CIPHER_key_length(c);
 560                 sess->master_key_length=i;
 561                 if (i > 0) RAND_bytes(sess->master_key,i);
 562
 563                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 564                         enc=8;
 565                 else if (sess->cipher->algorithms & SSL_EXP)
 566                         enc=5;
 567                 else
 568                         enc=i;
 569
 570                 if (i < enc)
 571                         {
 572                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 573                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
 574                         return(-1);
 575                         }
 576                 clear=i-enc;
 577                 s2n(clear,p);
 578                 memcpy(d,sess->master_key,(unsigned int)clear);
 579                 d+=clear;
 580
 581                 enc=ssl_rsa_public_encrypt(sess->cert,enc,
 582                         &(sess->master_key[clear]),d,
 583                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 584                 if (enc <= 0)
 585                         {
 586                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 587                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
 588                         return(-1);
 589                         }
 590 #ifdef PKCS1_CHECK
 591                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
 592                 if (s->options & SSL_OP_PKCS1_CHECK_2)
 593                         sess->master_key[clear]++;
 594 #endif
 595                 s2n(enc,p);
 596                 d+=enc;
 597                 karg=sess->key_arg_length;
 598                 s2n(karg,p); /* key arg size */
 599                 memcpy(d,sess->key_arg,(unsigned int)karg);
 600                 d+=karg;
 601
 602                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
 603                 s->init_num=d-buf;
 604                 s->init_off=0;
 605                 }
 606
 607         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
 608         return(ssl2_do_write(s));
 609         }
 610
 611 static int client_finished(s)
 612 SSL *s;
 613         {
 614         unsigned char *p;
 615
 616         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
 617                 {
 618                 p=(unsigned char *)s->init_buf->data;
 619                 *(p++)=SSL2_MT_CLIENT_FINISHED;
 620                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
 621
 622                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
 623                 s->init_num=s->s2->conn_id_length+1;
 624                 s->init_off=0;
 625                 }
 626         return(ssl2_do_write(s));
 627         }
 628
 629 /* read the data and then respond */
 630 static int client_certificate(s)
 631 SSL *s;
 632         {
 633         unsigned char *buf;
 634         unsigned char *p,*d;
 635         int i;
 636         unsigned int n;
 637         int cert_ch_len=0;
 638         unsigned char *cert_ch;
 639
 640         buf=(unsigned char *)s->init_buf->data;
 641         cert_ch= &(buf[2]);
 642
 643         /* We have a cert associated with the SSL, so attach it to
 644          * the session if it does not have one */
 645
 646         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
 647                 {
 648                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
 649                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
 650                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
 651                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
 652
 653                 /* type=buf[0]; */
 654                 /* type eq x509 */
 655                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 656                         {
 657                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 658                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
 659                         return(-1);
 660                         }
 661                 cert_ch_len=i-1;
 662
 663                 if ((s->cert == NULL) ||
 664                         (s->cert->key->x509 == NULL) ||
 665                         (s->cert->key->privatekey == NULL))
 666                         {
 667                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
 668                         }
 669                 else
 670                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 671                 }
 672
 673         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
 674                 {
 675                 X509 *x509=NULL;
 676                 EVP_PKEY *pkey=NULL;
 677
 678                 /* If we get an error we need to
 679                  * ssl->rwstate=SSL_X509_LOOKUP;
 680                  * return(error);
 681                  * We should then be retried when things are ok and we
 682                  * can get a cert or not */
 683
 684                 i=0;
 685                 if (s->ctx->client_cert_cb != NULL)
 686                         {
 687                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
 688                         }
 689
 690                 if (i < 0)
 691                         {
 692                         s->rwstate=SSL_X509_LOOKUP;
 693                         return(-1);
 694                         }
 695                 s->rwstate=SSL_NOTHING;
 696
 697                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
 698                         {
 699                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 700                         if (    !SSL_use_certificate(s,x509) ||
 701                                 !SSL_use_PrivateKey(s,pkey))
 702                                 {
 703                                 i=0;
 704                                 }
 705                         X509_free(x509);
 706                         EVP_PKEY_free(pkey);
 707                         }
 708                 else if (i == 1)
 709                         {
 710                         if (x509 != NULL) X509_free(x509);
 711                         if (pkey != NULL) EVP_PKEY_free(pkey);
 712                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
 713                         i=0;
 714                         }
 715
 716                 if (i == 0)
 717                         {
 718                         /* We have no client certificate to respond with
 719                          * so send the correct error message back */
 720                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
 721                         p=buf;
 722                         *(p++)=SSL2_MT_ERROR;
 723                         s2n(SSL2_PE_NO_CERTIFICATE,p);
 724                         s->init_off=0;
 725                         s->init_num=3;
 726                         /* Write is done at the end */
 727                         }
 728                 }
 729
 730         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
 731                 {
 732                 return(ssl2_do_write(s));
 733                 }
 734
 735         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
 736                 {
 737                 EVP_MD_CTX ctx;
 738
 739                 /* ok, now we calculate the checksum
 740                  * do it first so we can reuse buf :-) */
 741                 p=buf;
 742                 EVP_SignInit(&ctx,s->ctx->rsa_md5);
 743                 EVP_SignUpdate(&ctx,s->s2->key_material,
 744                         (unsigned int)s->s2->key_material_length);
 745                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
 746                 n=i2d_X509(s->session->cert->key->x509,&p);
 747                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
 748
 749                 p=buf;
 750                 d=p+6;
 751                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
 752                 *(p++)=SSL2_CT_X509_CERTIFICATE;
 753                 n=i2d_X509(s->cert->key->x509,&d);
 754                 s2n(n,p);
 755
 756                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
 757                         {
 758                         /* this is not good.  If things have failed it
 759                          * means there so something wrong with the key.
 760                          * We will contiune with a 0 length signature
 761                          */
 762                         }
 763                 memset(&ctx,0,sizeof(ctx));
 764                 s2n(n,p);
 765                 d+=n;
 766
 767                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
 768                 s->init_num=d-buf;
 769                 s->init_off=0;
 770                 }
 771         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
 772         return(ssl2_do_write(s));
 773         }
 774
 775 static int get_server_verify(s)
 776 SSL *s;
 777         {
 778         unsigned char *p;
 779         int i;
 780
 781         p=(unsigned char *)s->init_buf->data;
 782         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
 783                 {
 784                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 785                 if (i < (1-s->init_num))
 786                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 787
 788                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
 789                 s->init_num=0;
 790                 if (*p != SSL2_MT_SERVER_VERIFY)
 791                         {
 792                         if (p[0] != SSL2_MT_ERROR)
 793                                 {
 794                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 795                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 796                                         SSL_R_READ_WRONG_PACKET_TYPE);
 797                                 }
 798                         else
 799                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 800                                         SSL_R_PEER_ERROR);
 801                         return(-1);
 802                         }
 803                 }
 804
 805         p=(unsigned char *)s->init_buf->data;
 806         i=ssl2_read(s,(char *)&(p[s->init_num]),
 807                 (unsigned int)s->s2->challenge_length-s->init_num);
 808         if (i < ((int)s->s2->challenge_length-s->init_num))
 809                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 810         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
 811                 {
 812                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 813                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
 814                 return(-1);
 815                 }
 816         return(1);
 817         }
 818
 819 static int get_server_finished(s)
 820 SSL *s;
 821         {
 822         unsigned char *buf;
 823         unsigned char *p;
 824         int i;
 825
 826         buf=(unsigned char *)s->init_buf->data;
 827         p=buf;
 828         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
 829                 {
 830                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
 831                 if (i < (1-s->init_num))
 832                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 833                 s->init_num=i;
 834                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
 835                         {
 836                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
 837                         return(1);
 838                         }
 839                 else if (*p != SSL2_MT_SERVER_FINISHED)
 840                         {
 841                         if (p[0] != SSL2_MT_ERROR)
 842                                 {
 843                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 844                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 845                                 }
 846                         else
 847                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
 848                         return(-1);
 849                         }
 850                 s->state=SSL_ST_OK;
 851                 s->init_num=0;
 852                 }
 853
 854         i=ssl2_read(s,(char *)&(buf[s->init_num]),
 855                 SSL2_SSL_SESSION_ID_LENGTH-s->init_num);
 856         if (i < (SSL2_SSL_SESSION_ID_LENGTH-s->init_num))
 857                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 858
 859         if (!s->hit) /* new session */
 860                 {
 861                 /* new session-id */
 862                 /* Make sure we were not trying to re-use an old SSL_SESSION
 863                  * or bad things can happen */
 864                 /* ZZZZZZZZZZZZZ */
 865                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
 866                 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH);
 867                 }
 868         else
 869                 {
 870                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
 871                         {
 872                         if (memcmp(buf,s->session->session_id,
 873                                 (unsigned int)s->session->session_id_length) != 0)
 874                                 {
 875                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 876                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
 877                                 return(-1);
 878                                 }
 879                         }
 880                 }
 881         return(1);
 882         }
 883
 884 /* loads in the certificate from the server */
 885 int ssl2_set_certificate(s, type, len, data)
 886 SSL *s;
 887 int type;
 888 int len;
 889 unsigned char *data;
 890         {
 891         STACK *sk=NULL;
 892         EVP_PKEY *pkey=NULL;
 893         CERT *c=NULL;
 894         int i;
 895         X509 *x509=NULL;
 896         int ret=0;
 897
 898         x509=d2i_X509(NULL,&data,(long)len);
 899         if (x509 == NULL)
 900                 {
 901                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
 902                 goto err;
 903                 }
 904
 905         if (((sk=sk_new_null()) == NULL) ||
 906                 (!sk_push(sk,(char *)x509)))
 907                 {
 908                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 909                 goto err;
 910                 }
 911
 912         i=ssl_verify_cert_chain(s,sk);
 913
 914         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 915                 {
 916                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 917                 goto err;
 918                 }
 919
 920         /* cert for ssl */
 921         c=ssl_cert_new();
 922         if (c == NULL)
 923                 {
 924                 ret= -1;
 925                 goto err;
 926                 }
 927
 928         /* cert for session */
 929         if (s->session->cert) ssl_cert_free(s->session->cert);
 930         s->session->cert=c;
 931
 932 /*      c->cert_type=type; */
 933
 934         c->pkeys[SSL_PKEY_RSA_ENC].x509=x509;
 935         c->key= &(c->pkeys[SSL_PKEY_RSA_ENC]);
 936
 937         pkey=X509_get_pubkey(x509);
 938         x509=NULL;
 939         if (pkey == NULL)
 940                 {
 941                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
 942                 goto err;
 943                 }
 944         if (pkey->type != EVP_PKEY_RSA)
 945                 {
 946                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
 947                 goto err;
 948                 }
 949
 950         if (!ssl_set_cert_type(c,SSL2_CT_X509_CERTIFICATE))
 951                 goto err;
 952         ret=1;
 953 err:
 954         if (sk != NULL) sk_free(sk);
 955         if (x509 != NULL) X509_free(x509);
 956         return(ret);
 957         }
 958
 959 static int ssl_rsa_public_encrypt(c, len, from, to, padding)
 960 CERT *c;
 961 int len;
 962 unsigned char *from;
 963 unsigned char *to;
 964 int padding;
 965         {
 966         EVP_PKEY *pkey=NULL;
 967         int i= -1;
 968
 969         if ((c == NULL) || (c->key->x509 == NULL) ||
 970                 ((pkey=X509_get_pubkey(c->key->x509)) == NULL))
 971                 {
 972                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
 973                 return(-1);
 974                 }
 975         if (pkey->type != EVP_PKEY_RSA)
 976                 {
 977                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 978                 goto end;
 979                 }
 980
 981         /* we have the public key */
 982         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
 983         if (i < 0)
 984                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
 985 end:
 986         return(i);
 987         }
 988