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 #ifndef NO_RSA
  60 #include <stdio.h>
  61 #include <openssl/rand.h>
  62 #include <openssl/buffer.h>
  63 #include <openssl/objects.h>
  64 #include "ssl_locl.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(CERT *c, 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_seed(&l,sizeof(l));
 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 sucessfully 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;
 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                 s->hit=(*(p++))?1:0;
 314                 s->s2->tmp.cert_type= *(p++);
 315                 n2s(p,i);
 316                 if (i < s->version) s->version=i;
 317                 n2s(p,i); s->s2->tmp.cert_length=i;
 318                 n2s(p,i); s->s2->tmp.csl=i;
 319                 n2s(p,i); s->s2->tmp.conn_id_length=i;
 320                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
 321                 s->init_num=0;
 322                 }
 323
 324         /* SSL2_ST_GET_SERVER_HELLO_B */
 325         j=s->s2->tmp.cert_length+s->s2->tmp.csl+s->s2->tmp.conn_id_length
 326                 - s->init_num;
 327         i=ssl2_read(s,(char *)&(buf[s->init_num]),j);
 328         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 329
 330         /* things are looking good */
 331
 332         p=buf;
 333         if (s->hit)
 334                 {
 335                 if (s->s2->tmp.cert_length != 0)
 336                         {
 337                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
 338                         return(-1);
 339                         }
 340                 if (s->s2->tmp.cert_type != 0)
 341                         {
 342                         if (!(s->options &
 343                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
 344                                 {
 345                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
 346                                 return(-1);
 347                                 }
 348                         }
 349                 if (s->s2->tmp.csl != 0)
 350                         {
 351                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
 352                         return(-1);
 353                         }
 354                 }
 355         else
 356                 {
 357 #ifdef undef
 358                 /* very bad */
 359                 memset(s->session->session_id,0,
 360                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
 361                 s->session->session_id_length=0;
 362                 */
 363 #endif
 364
 365                 /* we need to do this incase we were trying to reuse a
 366                  * client session but others are already reusing it.
 367                  * If this was a new 'blank' session ID, the session-id
 368                  * length will still be 0 */
 369                 if (s->session->session_id_length > 0)
 370                         {
 371                         if (!ssl_get_new_session(s,0))
 372                                 {
 373                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 374                                 return(-1);
 375                                 }
 376                         }
 377
 378                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
 379                         s->s2->tmp.cert_length,p) <= 0)
 380                         {
 381                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 382                         return(-1);
 383                         }
 384                 p+=s->s2->tmp.cert_length;
 385
 386                 if (s->s2->tmp.csl == 0)
 387                         {
 388                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 389                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
 390                         return(-1);
 391                         }
 392
 393                 /* We have just received a list of ciphers back from the
 394                  * server.  We need to get the ones that match, then select
 395                  * the one we want the most :-). */
 396
 397                 /* load the ciphers */
 398                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
 399                                             &s->session->ciphers);
 400                 p+=s->s2->tmp.csl;
 401                 if (sk == NULL)
 402                         {
 403                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 404                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
 405                         return(-1);
 406                         }
 407
 408                 sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
 409
 410                 /* get the array of ciphers we will accept */
 411                 cl=ssl_get_ciphers_by_id(s);
 412
 413                 /* In theory we could have ciphers sent back that we
 414                  * don't want to use but that does not matter since we
 415                  * will check against the list we origionally sent and
 416                  * for performance reasons we should not bother to match
 417                  * the two lists up just to check. */
 418                 for (i=0; i<sk_SSL_CIPHER_num(cl); i++)
 419                         {
 420                         if (sk_SSL_CIPHER_find(sk,
 421                                                sk_SSL_CIPHER_value(cl,i)) >= 0)
 422                                 break;
 423                         }
 424
 425                 if (i >= sk_SSL_CIPHER_num(cl))
 426                         {
 427                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 428                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
 429                         return(-1);
 430                         }
 431                 s->session->cipher=sk_SSL_CIPHER_value(cl,i);
 432                 }
 433
 434         if ((s->session != NULL) && (s->session->peer != NULL))
 435                 X509_free(s->session->peer);
 436
 437         /* hmmm, can we have the problem of the other session with this
 438          * cert, Free's it before we increment the reference count. */
 439         CRYPTO_w_lock(CRYPTO_LOCK_X509);
 440         s->session->peer=s->session->cert->key->x509;
 441         CRYPTO_add(&s->session->peer->references,1,CRYPTO_LOCK_X509);
 442         CRYPTO_w_unlock(CRYPTO_LOCK_X509);
 443
 444         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
 445         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
 446         return(1);
 447         }
 448
 449 static int client_hello(SSL *s)
 450         {
 451         unsigned char *buf;
 452         unsigned char *p,*d;
 453 /*      CIPHER **cipher;*/
 454         int i,n,j;
 455
 456         buf=(unsigned char *)s->init_buf->data;
 457         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
 458                 {
 459                 if ((s->session == NULL) ||
 460                         (s->session->ssl_version != s->version))
 461                         {
 462                         if (!ssl_get_new_session(s,0))
 463                                 {
 464                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 465                                 return(-1);
 466                                 }
 467                         }
 468                 /* else use the pre-loaded session */
 469
 470                 p=buf;                                  /* header */
 471                 d=p+9;                                  /* data section */
 472                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
 473                 s2n(SSL2_VERSION,p);                    /* version */
 474                 n=j=0;
 475
 476                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d);
 477                 d+=n;
 478
 479                 if (n == 0)
 480                         {
 481                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 482                         return(-1);
 483                         }
 484
 485                 s2n(n,p);                       /* cipher spec num bytes */
 486
 487                 if ((s->session->session_id_length > 0) &&
 488                         (s->session->session_id_length <=
 489                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
 490                         {
 491                         i=s->session->session_id_length;
 492                         s2n(i,p);               /* session id length */
 493                         memcpy(d,s->session->session_id,(unsigned int)i);
 494                         d+=i;
 495                         }
 496                 else
 497                         {
 498                         s2n(0,p);
 499                         }
 500
 501                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
 502                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
 503                 /*challenge id data*/
 504                 RAND_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 505                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 506                 d+=SSL2_CHALLENGE_LENGTH;
 507
 508                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
 509                 s->init_num=d-buf;
 510                 s->init_off=0;
 511                 }
 512         /* SSL2_ST_SEND_CLIENT_HELLO_B */
 513         return(ssl2_do_write(s));
 514         }
 515
 516 static int client_master_key(SSL *s)
 517         {
 518         unsigned char *buf;
 519         unsigned char *p,*d;
 520         int clear,enc,karg,i;
 521         SSL_SESSION *sess;
 522         const EVP_CIPHER *c;
 523         const EVP_MD *md;
 524
 525         buf=(unsigned char *)s->init_buf->data;
 526         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
 527                 {
 528
 529                 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
 530                         {
 531                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 532                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 533                         return(-1);
 534                         }
 535                 sess=s->session;
 536                 p=buf;
 537                 d=p+10;
 538                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
 539
 540                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
 541                 p+=i;
 542
 543                 /* make key_arg data */
 544                 i=EVP_CIPHER_iv_length(c);
 545                 sess->key_arg_length=i;
 546                 if (i > 0) RAND_bytes(sess->key_arg,i);
 547
 548                 /* make a master key */
 549                 i=EVP_CIPHER_key_length(c);
 550                 sess->master_key_length=i;
 551                 if (i > 0) RAND_bytes(sess->master_key,i);
 552
 553                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 554                         enc=8;
 555                 else if (SSL_C_IS_EXPORT(sess->cipher))
 556                         enc=5;
 557                 else
 558                         enc=i;
 559
 560                 if (i < enc)
 561                         {
 562                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 563                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
 564                         return(-1);
 565                         }
 566                 clear=i-enc;
 567                 s2n(clear,p);
 568                 memcpy(d,sess->master_key,(unsigned int)clear);
 569                 d+=clear;
 570
 571                 enc=ssl_rsa_public_encrypt(sess->cert,enc,
 572                         &(sess->master_key[clear]),d,
 573                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 574                 if (enc <= 0)
 575                         {
 576                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 577                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
 578                         return(-1);
 579                         }
 580 #ifdef PKCS1_CHECK
 581                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
 582                 if (s->options & SSL_OP_PKCS1_CHECK_2)
 583                         sess->master_key[clear]++;
 584 #endif
 585                 s2n(enc,p);
 586                 d+=enc;
 587                 karg=sess->key_arg_length;
 588                 s2n(karg,p); /* key arg size */
 589                 memcpy(d,sess->key_arg,(unsigned int)karg);
 590                 d+=karg;
 591
 592                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
 593                 s->init_num=d-buf;
 594                 s->init_off=0;
 595                 }
 596
 597         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
 598         return(ssl2_do_write(s));
 599         }
 600
 601 static int client_finished(SSL *s)
 602         {
 603         unsigned char *p;
 604
 605         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
 606                 {
 607                 p=(unsigned char *)s->init_buf->data;
 608                 *(p++)=SSL2_MT_CLIENT_FINISHED;
 609                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
 610
 611                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
 612                 s->init_num=s->s2->conn_id_length+1;
 613                 s->init_off=0;
 614                 }
 615         return(ssl2_do_write(s));
 616         }
 617
 618 /* read the data and then respond */
 619 static int client_certificate(SSL *s)
 620         {
 621         unsigned char *buf;
 622         unsigned char *p,*d;
 623         int i;
 624         unsigned int n;
 625         int cert_ch_len=0;
 626         unsigned char *cert_ch;
 627
 628         buf=(unsigned char *)s->init_buf->data;
 629         cert_ch= &(buf[2]);
 630
 631         /* We have a cert associated with the SSL, so attach it to
 632          * the session if it does not have one */
 633
 634         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
 635                 {
 636                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
 637                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
 638                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
 639                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
 640
 641                 /* type=buf[0]; */
 642                 /* type eq x509 */
 643                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 644                         {
 645                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 646                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
 647                         return(-1);
 648                         }
 649                 cert_ch_len=i-1;
 650
 651                 if ((s->cert == NULL) ||
 652                         (s->cert->key->x509 == NULL) ||
 653                         (s->cert->key->privatekey == NULL))
 654                         {
 655                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
 656                         }
 657                 else
 658                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 659                 }
 660
 661         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
 662                 {
 663                 X509 *x509=NULL;
 664                 EVP_PKEY *pkey=NULL;
 665
 666                 /* If we get an error we need to
 667                  * ssl->rwstate=SSL_X509_LOOKUP;
 668                  * return(error);
 669                  * We should then be retried when things are ok and we
 670                  * can get a cert or not */
 671
 672                 i=0;
 673                 if (s->ctx->client_cert_cb != NULL)
 674                         {
 675                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
 676                         }
 677
 678                 if (i < 0)
 679                         {
 680                         s->rwstate=SSL_X509_LOOKUP;
 681                         return(-1);
 682                         }
 683                 s->rwstate=SSL_NOTHING;
 684
 685                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
 686                         {
 687                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 688                         if (    !SSL_use_certificate(s,x509) ||
 689                                 !SSL_use_PrivateKey(s,pkey))
 690                                 {
 691                                 i=0;
 692                                 }
 693                         X509_free(x509);
 694                         EVP_PKEY_free(pkey);
 695                         }
 696                 else if (i == 1)
 697                         {
 698                         if (x509 != NULL) X509_free(x509);
 699                         if (pkey != NULL) EVP_PKEY_free(pkey);
 700                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
 701                         i=0;
 702                         }
 703
 704                 if (i == 0)
 705                         {
 706                         /* We have no client certificate to respond with
 707                          * so send the correct error message back */
 708                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
 709                         p=buf;
 710                         *(p++)=SSL2_MT_ERROR;
 711                         s2n(SSL2_PE_NO_CERTIFICATE,p);
 712                         s->init_off=0;
 713                         s->init_num=3;
 714                         /* Write is done at the end */
 715                         }
 716                 }
 717
 718         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
 719                 {
 720                 return(ssl2_do_write(s));
 721                 }
 722
 723         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
 724                 {
 725                 EVP_MD_CTX ctx;
 726
 727                 /* ok, now we calculate the checksum
 728                  * do it first so we can reuse buf :-) */
 729                 p=buf;
 730                 EVP_SignInit(&ctx,s->ctx->rsa_md5);
 731                 EVP_SignUpdate(&ctx,s->s2->key_material,
 732                         (unsigned int)s->s2->key_material_length);
 733                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
 734                 n=i2d_X509(s->session->cert->key->x509,&p);
 735                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
 736
 737                 p=buf;
 738                 d=p+6;
 739                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
 740                 *(p++)=SSL2_CT_X509_CERTIFICATE;
 741                 n=i2d_X509(s->cert->key->x509,&d);
 742                 s2n(n,p);
 743
 744                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
 745                         {
 746                         /* this is not good.  If things have failed it
 747                          * means there so something wrong with the key.
 748                          * We will contiune with a 0 length signature
 749                          */
 750                         }
 751                 memset(&ctx,0,sizeof(ctx));
 752                 s2n(n,p);
 753                 d+=n;
 754
 755                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
 756                 s->init_num=d-buf;
 757                 s->init_off=0;
 758                 }
 759         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
 760         return(ssl2_do_write(s));
 761         }
 762
 763 static int get_server_verify(SSL *s)
 764         {
 765         unsigned char *p;
 766         int i;
 767
 768         p=(unsigned char *)s->init_buf->data;
 769         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
 770                 {
 771                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 772                 if (i < (1-s->init_num))
 773                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 774
 775                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
 776                 s->init_num=0;
 777                 if (*p != SSL2_MT_SERVER_VERIFY)
 778                         {
 779                         if (p[0] != SSL2_MT_ERROR)
 780                                 {
 781                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 782                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 783                                         SSL_R_READ_WRONG_PACKET_TYPE);
 784                                 }
 785                         else
 786                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 787                                         SSL_R_PEER_ERROR);
 788                         return(-1);
 789                         }
 790                 }
 791
 792         p=(unsigned char *)s->init_buf->data;
 793         i=ssl2_read(s,(char *)&(p[s->init_num]),
 794                 (unsigned int)s->s2->challenge_length-s->init_num);
 795         if (i < ((int)s->s2->challenge_length-s->init_num))
 796                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 797         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
 798                 {
 799                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 800                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
 801                 return(-1);
 802                 }
 803         return(1);
 804         }
 805
 806 static int get_server_finished(SSL *s)
 807         {
 808         unsigned char *buf;
 809         unsigned char *p;
 810         int i;
 811
 812         buf=(unsigned char *)s->init_buf->data;
 813         p=buf;
 814         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
 815                 {
 816                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
 817                 if (i < (1-s->init_num))
 818                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 819                 s->init_num=i;
 820                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
 821                         {
 822                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
 823                         return(1);
 824                         }
 825                 else if (*p != SSL2_MT_SERVER_FINISHED)
 826                         {
 827                         if (p[0] != SSL2_MT_ERROR)
 828                                 {
 829                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 830                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 831                                 }
 832                         else
 833                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
 834                         return(-1);
 835                         }
 836                 s->state=SSL_ST_OK;
 837                 s->init_num=0;
 838                 }
 839
 840         i=ssl2_read(s,(char *)&(buf[s->init_num]),
 841                 SSL2_SSL_SESSION_ID_LENGTH-s->init_num);
 842         if (i < (SSL2_SSL_SESSION_ID_LENGTH-s->init_num))
 843                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 844
 845         if (!s->hit) /* new session */
 846                 {
 847                 /* new session-id */
 848                 /* Make sure we were not trying to re-use an old SSL_SESSION
 849                  * or bad things can happen */
 850                 /* ZZZZZZZZZZZZZ */
 851                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
 852                 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH);
 853                 }
 854         else
 855                 {
 856                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
 857                         {
 858                         if (memcmp(buf,s->session->session_id,
 859                                 (unsigned int)s->session->session_id_length) != 0)
 860                                 {
 861                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 862                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
 863                                 return(-1);
 864                                 }
 865                         }
 866                 }
 867         return(1);
 868         }
 869
 870 /* loads in the certificate from the server */
 871 int ssl2_set_certificate(SSL *s, int type, int len, unsigned char *data)
 872         {
 873         STACK_OF(X509) *sk=NULL;
 874         EVP_PKEY *pkey=NULL;
 875         CERT *c=NULL;
 876         int i;
 877         X509 *x509=NULL;
 878         int ret=0;
 879
 880         x509=d2i_X509(NULL,&data,(long)len);
 881         if (x509 == NULL)
 882                 {
 883                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
 884                 goto err;
 885                 }
 886
 887         if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
 888                 {
 889                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 890                 goto err;
 891                 }
 892
 893         i=ssl_verify_cert_chain(s,sk);
 894
 895         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 896                 {
 897                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 898                 goto err;
 899                 }
 900
 901         /* cert for ssl */
 902         c=ssl_cert_new();
 903         if (c == NULL)
 904                 {
 905                 ret= -1;
 906                 goto err;
 907                 }
 908
 909         /* cert for session */
 910         if (s->session->cert) ssl_cert_free(s->session->cert);
 911         s->session->cert=c;
 912
 913 /*      c->cert_type=type; */
 914
 915         c->pkeys[SSL_PKEY_RSA_ENC].x509=x509;
 916         c->key= &(c->pkeys[SSL_PKEY_RSA_ENC]);
 917
 918         pkey=X509_get_pubkey(x509);
 919         x509=NULL;
 920         if (pkey == NULL)
 921                 {
 922                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
 923                 goto err;
 924                 }
 925         if (pkey->type != EVP_PKEY_RSA)
 926                 {
 927                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
 928                 goto err;
 929                 }
 930
 931         if (!ssl_set_cert_type(c,SSL2_CT_X509_CERTIFICATE))
 932                 goto err;
 933         ret=1;
 934 err:
 935         sk_X509_free(sk);
 936         X509_free(x509);
 937         EVP_PKEY_free(pkey);
 938         return(ret);
 939         }
 940
 941 static int ssl_rsa_public_encrypt(CERT *c, int len, unsigned char *from,
 942              unsigned char *to, int padding)
 943         {
 944         EVP_PKEY *pkey=NULL;
 945         int i= -1;
 946
 947         if ((c == NULL) || (c->key->x509 == NULL) ||
 948                 ((pkey=X509_get_pubkey(c->key->x509)) == NULL))
 949                 {
 950                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
 951                 return(-1);
 952                 }
 953         if (pkey->type != EVP_PKEY_RSA)
 954                 {
 955                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 956                 goto end;
 957                 }
 958
 959         /* we have the public key */
 960         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
 961         if (i < 0)
 962                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
 963 end:
 964         EVP_PKEY_free(pkey);
 965         return(i);
 966         }
 967 #endif