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 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 #else
  78 static SSL_METHOD *ssl2_get_client_method();
  79 static int get_server_finished();
  80 static int get_server_verify();
  81 static int get_server_hello();
  82 static int client_hello();
  83 static int client_master_key();
  84 static int client_finished();
  85 static int client_certificate();
  86 static int ssl_rsa_public_encrypt();
  87 #endif
  88
  89 #define BREAK   break
  90
  91 static SSL_METHOD *ssl2_get_client_method(ver)
  92 int ver;
  93         {
  94         if (ver == SSL2_VERSION)
  95                 return(SSLv2_client_method());
  96         else
  97                 return(NULL);
  98         }
  99
 100 SSL_METHOD *SSLv2_client_method()
 101         {
 102         static int init=1;
 103         static SSL_METHOD SSLv2_client_data;
 104
 105         if (init)
 106                 {
 107                 init=0;
 108                 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
 109                         sizeof(SSL_METHOD));
 110                 SSLv2_client_data.ssl_connect=ssl2_connect;
 111                 SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
 112                 }
 113         return(&SSLv2_client_data);
 114         }
 115
 116 int ssl2_connect(s)
 117 SSL *s;
 118         {
 119         unsigned long l=time(NULL);
 120         BUF_MEM *buf=NULL;
 121         int ret= -1;
 122         void (*cb)()=NULL;
 123         int new_state,state;
 124
 125         RAND_seed(&l,sizeof(l));
 126         ERR_clear_error();
 127         clear_sys_error();
 128
 129         if (s->info_callback != NULL)
 130                 cb=s->info_callback;
 131         else if (s->ctx->info_callback != NULL)
 132                 cb=s->ctx->info_callback;
 133
 134         /* init things to blank */
 135         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 136         s->in_handshake++;
 137
 138         for (;;)
 139                 {
 140                 state=s->state;
 141
 142                 switch (s->state)
 143                         {
 144                 case SSL_ST_BEFORE:
 145                 case SSL_ST_CONNECT:
 146                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 147                 case SSL_ST_OK|SSL_ST_CONNECT:
 148
 149                         s->server=0;
 150                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 151
 152                         s->version=SSL2_VERSION;
 153                         s->type=SSL_ST_CONNECT;
 154
 155                         buf=s->init_buf;
 156                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 157                                 {
 158                                 ret= -1;
 159                                 goto end;
 160                                 }
 161                         if (!BUF_MEM_grow(buf,
 162                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 163                                 {
 164                                 ret= -1;
 165                                 goto end;
 166                                 }
 167                         s->init_buf=buf;
 168                         s->init_num=0;
 169                         s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
 170                         s->ctx->stats.sess_connect++;
 171                         s->handshake_func=ssl2_connect;
 172                         BREAK;
 173
 174                 case SSL2_ST_SEND_CLIENT_HELLO_A:
 175                 case SSL2_ST_SEND_CLIENT_HELLO_B:
 176                         s->shutdown=0;
 177                         ret=client_hello(s);
 178                         if (ret <= 0) goto end;
 179                         s->init_num=0;
 180                         s->state=SSL2_ST_GET_SERVER_HELLO_A;
 181                         BREAK;
 182
 183                 case SSL2_ST_GET_SERVER_HELLO_A:
 184                 case SSL2_ST_GET_SERVER_HELLO_B:
 185                         ret=get_server_hello(s);
 186                         if (ret <= 0) goto end;
 187                         s->init_num=0;
 188                         if (!s->hit) /* new session */
 189                                 {
 190                                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
 191                                 BREAK;
 192                                 }
 193                         else
 194                                 {
 195                                 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 196                                 break;
 197                                 }
 198
 199                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
 200                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
 201                         ret=client_master_key(s);
 202                         if (ret <= 0) goto end;
 203                         s->init_num=0;
 204                         s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 205                         break;
 206
 207                 case SSL2_ST_CLIENT_START_ENCRYPTION:
 208                         /* Ok, we now have all the stuff needed to
 209                          * start encrypting, so lets fire it up :-) */
 210                         if (!ssl2_enc_init(s,1))
 211                                 {
 212                                 ret= -1;
 213                                 goto end;
 214                                 }
 215                         s->s2->clear_text=0;
 216                         s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
 217                         break;
 218
 219                 case SSL2_ST_SEND_CLIENT_FINISHED_A:
 220                 case SSL2_ST_SEND_CLIENT_FINISHED_B:
 221                         ret=client_finished(s);
 222                         if (ret <= 0) goto end;
 223                         s->init_num=0;
 224                         s->state=SSL2_ST_GET_SERVER_VERIFY_A;
 225                         break;
 226
 227                 case SSL2_ST_GET_SERVER_VERIFY_A:
 228                 case SSL2_ST_GET_SERVER_VERIFY_B:
 229                         ret=get_server_verify(s);
 230                         if (ret <= 0) goto end;
 231                         s->init_num=0;
 232                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 233                         break;
 234
 235                 case SSL2_ST_GET_SERVER_FINISHED_A:
 236                 case SSL2_ST_GET_SERVER_FINISHED_B:
 237                         ret=get_server_finished(s);
 238                         if (ret <= 0) goto end;
 239                         break;
 240
 241                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
 242                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
 243                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
 244                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
 245                 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
 246                         ret=client_certificate(s);
 247                         if (ret <= 0) goto end;
 248                         s->init_num=0;
 249                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 250                         break;
 251
 252                 case SSL_ST_OK:
 253                         if (s->init_buf != NULL)
 254                                 {
 255                                 BUF_MEM_free(s->init_buf);
 256                                 s->init_buf=NULL;
 257                                 }
 258                         s->init_num=0;
 259                 /*      ERR_clear_error();*/
 260
 261                         /* If we want to cache session-ids in the client
 262                          * and we sucessfully add the session-id to the
 263                          * cache, and there is a callback, then pass it out.
 264                          * 26/11/96 - eay - only add if not a re-used session.
 265                          */
 266
 267                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 268                         if (s->hit) s->ctx->stats.sess_hit++;
 269
 270                         ret=1;
 271                         /* s->server=0; */
 272                         s->ctx->stats.sess_connect_good++;
 273
 274                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 275
 276                         goto end;
 277                         /* break; */
 278                 default:
 279                         SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
 280                         return(-1);
 281                         /* break; */
 282                         }
 283
 284                 if ((cb != NULL) && (s->state != state))
 285                         {
 286                         new_state=s->state;
 287                         s->state=state;
 288                         cb(s,SSL_CB_CONNECT_LOOP,1);
 289                         s->state=new_state;
 290                         }
 291                 }
 292 end:
 293         s->in_handshake--;
 294         if (cb != NULL)
 295                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 296         return(ret);
 297         }
 298
 299 static int get_server_hello(s)
 300 SSL *s;
 301         {
 302         unsigned char *buf;
 303         unsigned char *p;
 304         int i,j;
 305         STACK *sk=NULL,*cl;
 306
 307         buf=(unsigned char *)s->init_buf->data;
 308         p=buf;
 309         if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
 310                 {
 311                 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
 312                 if (i < (11-s->init_num))
 313                         return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 314
 315                 if (*(p++) != SSL2_MT_SERVER_HELLO)
 316                         {
 317                         if (p[-1] != SSL2_MT_ERROR)
 318                                 {
 319                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 320                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 321                                         SSL_R_READ_WRONG_PACKET_TYPE);
 322                                 }
 323                         else
 324                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 325                                         SSL_R_PEER_ERROR);
 326                         return(-1);
 327                         }
 328                 s->hit=(*(p++))?1:0;
 329                 s->s2->tmp.cert_type= *(p++);
 330                 n2s(p,i);
 331                 if (i < s->version) s->version=i;
 332                 n2s(p,i); s->s2->tmp.cert_length=i;
 333                 n2s(p,i); s->s2->tmp.csl=i;
 334                 n2s(p,i); s->s2->tmp.conn_id_length=i;
 335                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
 336                 s->init_num=0;
 337                 }
 338
 339         /* SSL2_ST_GET_SERVER_HELLO_B */
 340         j=s->s2->tmp.cert_length+s->s2->tmp.csl+s->s2->tmp.conn_id_length
 341                 - s->init_num;
 342         i=ssl2_read(s,(char *)&(buf[s->init_num]),j);
 343         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 344
 345         /* things are looking good */
 346
 347         p=buf;
 348         if (s->hit)
 349                 {
 350                 if (s->s2->tmp.cert_length != 0)
 351                         {
 352                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
 353                         return(-1);
 354                         }
 355                 if (s->s2->tmp.cert_type != 0)
 356                         {
 357                         if (!(s->options &
 358                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
 359                                 {
 360                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
 361                                 return(-1);
 362                                 }
 363                         }
 364                 if (s->s2->tmp.csl != 0)
 365                         {
 366                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
 367                         return(-1);
 368                         }
 369                 }
 370         else
 371                 {
 372 #ifdef undef
 373                 /* very bad */
 374                 memset(s->session->session_id,0,
 375                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
 376                 s->session->session_id_length=0;
 377                 */
 378 #endif
 379
 380                 /* we need to do this incase we were trying to reuse a
 381                  * client session but others are already reusing it.
 382                  * If this was a new 'blank' session ID, the session-id
 383                  * length will still be 0 */
 384                 if (s->session->session_id_length > 0)
 385                         {
 386                         if (!ssl_get_new_session(s,0))
 387                                 {
 388                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 389                                 return(-1);
 390                                 }
 391                         }
 392
 393                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
 394                         s->s2->tmp.cert_length,p) <= 0)
 395                         {
 396                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 397                         return(-1);
 398                         }
 399                 p+=s->s2->tmp.cert_length;
 400
 401                 if (s->s2->tmp.csl == 0)
 402                         {
 403                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 404                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
 405                         return(-1);
 406                         }
 407
 408                 /* We have just received a list of ciphers back from the
 409                  * server.  We need to get the ones that match, then select
 410                  * the one we want the most :-). */
 411
 412                 /* load the ciphers */
 413                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
 414                         &s->session->ciphers);
 415                 p+=s->s2->tmp.csl;
 416                 if (sk == NULL)
 417                         {
 418                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 419                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
 420                         return(-1);
 421                         }
 422
 423                 sk_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
 424
 425                 /* get the array of ciphers we will accept */
 426                 cl=ssl_get_ciphers_by_id(s);
 427
 428                 /* In theory we could have ciphers sent back that we
 429                  * don't want to use but that does not matter since we
 430                  * will check against the list we origionally sent and
 431                  * for performance reasons we should not bother to match
 432                  * the two lists up just to check. */
 433                 for (i=0; i<sk_num(cl); i++)
 434                         {
 435                         if (sk_find(sk,sk_value(cl,i)) >= 0)
 436                                 break;
 437                         }
 438
 439                 if (i >= sk_num(cl))
 440                         {
 441                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 442                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
 443                         return(-1);
 444                         }
 445                 s->session->cipher=(SSL_CIPHER *)sk_value(cl,i);
 446                 }
 447
 448         if ((s->session != NULL) && (s->session->peer != NULL))
 449                 X509_free(s->session->peer);
 450
 451         /* hmmm, can we have the problem of the other session with this
 452          * cert, Free's it before we increment the reference count. */
 453         CRYPTO_w_lock(CRYPTO_LOCK_X509);
 454         s->session->peer=s->session->cert->key->x509;
 455         CRYPTO_add(&s->session->peer->references,1,CRYPTO_LOCK_X509);
 456         CRYPTO_w_unlock(CRYPTO_LOCK_X509);
 457
 458         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
 459         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
 460         return(1);
 461         }
 462
 463 static int client_hello(s)
 464 SSL *s;
 465         {
 466         unsigned char *buf;
 467         unsigned char *p,*d;
 468 /*      CIPHER **cipher;*/
 469         int i,n,j;
 470
 471         buf=(unsigned char *)s->init_buf->data;
 472         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
 473                 {
 474                 if ((s->session == NULL) ||
 475                         (s->session->ssl_version != s->version))
 476                         {
 477                         if (!ssl_get_new_session(s,0))
 478                                 {
 479                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 480                                 return(-1);
 481                                 }
 482                         }
 483                 /* else use the pre-loaded session */
 484
 485                 p=buf;                                  /* header */
 486                 d=p+9;                                  /* data section */
 487                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
 488                 s2n(SSL2_CLIENT_VERSION,p);             /* version */
 489                 n=j=0;
 490
 491                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d);
 492                 d+=n;
 493
 494                 if (n == 0)
 495                         {
 496                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 497                         return(-1);
 498                         }
 499
 500                 s2n(n,p);                       /* cipher spec num bytes */
 501
 502                 if ((s->session->session_id_length > 0) &&
 503                         (s->session->session_id_length <=
 504                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
 505                         {
 506                         i=s->session->session_id_length;
 507                         s2n(i,p);               /* session id length */
 508                         memcpy(d,s->session->session_id,(unsigned int)i);
 509                         d+=i;
 510                         }
 511                 else
 512                         {
 513                         s2n(0,p);
 514                         }
 515
 516                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
 517                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
 518                 /*challenge id data*/
 519                 RAND_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 520                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 521                 d+=SSL2_CHALLENGE_LENGTH;
 522
 523                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
 524                 s->init_num=d-buf;
 525                 s->init_off=0;
 526                 }
 527         /* SSL2_ST_SEND_CLIENT_HELLO_B */
 528         return(ssl2_do_write(s));
 529         }
 530
 531 static int client_master_key(s)
 532 SSL *s;
 533         {
 534         unsigned char *buf;
 535         unsigned char *p,*d;
 536         int clear,enc,karg,i;
 537         SSL_SESSION *sess;
 538         EVP_CIPHER *c;
 539         EVP_MD *md;
 540
 541         buf=(unsigned char *)s->init_buf->data;
 542         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
 543                 {
 544
 545                 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
 546                         {
 547                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 548                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 549                         return(-1);
 550                         }
 551                 sess=s->session;
 552                 p=buf;
 553                 d=p+10;
 554                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
 555
 556                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
 557                 p+=i;
 558
 559                 /* make key_arg data */
 560                 i=EVP_CIPHER_iv_length(c);
 561                 sess->key_arg_length=i;
 562                 if (i > 0) RAND_bytes(sess->key_arg,i);
 563
 564                 /* make a master key */
 565                 i=EVP_CIPHER_key_length(c);
 566                 sess->master_key_length=i;
 567                 if (i > 0) RAND_bytes(sess->master_key,i);
 568
 569                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 570                         enc=8;
 571                 else if (SSL_C_IS_EXPORT(sess->cipher))
 572                         enc=5;
 573                 else
 574                         enc=i;
 575
 576                 if (i < enc)
 577                         {
 578                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 579                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
 580                         return(-1);
 581                         }
 582                 clear=i-enc;
 583                 s2n(clear,p);
 584                 memcpy(d,sess->master_key,(unsigned int)clear);
 585                 d+=clear;
 586
 587                 enc=ssl_rsa_public_encrypt(sess->cert,enc,
 588                         &(sess->master_key[clear]),d,
 589                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 590                 if (enc <= 0)
 591                         {
 592                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 593                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
 594                         return(-1);
 595                         }
 596 #ifdef PKCS1_CHECK
 597                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
 598                 if (s->options & SSL_OP_PKCS1_CHECK_2)
 599                         sess->master_key[clear]++;
 600 #endif
 601                 s2n(enc,p);
 602                 d+=enc;
 603                 karg=sess->key_arg_length;
 604                 s2n(karg,p); /* key arg size */
 605                 memcpy(d,sess->key_arg,(unsigned int)karg);
 606                 d+=karg;
 607
 608                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
 609                 s->init_num=d-buf;
 610                 s->init_off=0;
 611                 }
 612
 613         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
 614         return(ssl2_do_write(s));
 615         }
 616
 617 static int client_finished(s)
 618 SSL *s;
 619         {
 620         unsigned char *p;
 621
 622         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
 623                 {
 624                 p=(unsigned char *)s->init_buf->data;
 625                 *(p++)=SSL2_MT_CLIENT_FINISHED;
 626                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
 627
 628                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
 629                 s->init_num=s->s2->conn_id_length+1;
 630                 s->init_off=0;
 631                 }
 632         return(ssl2_do_write(s));
 633         }
 634
 635 /* read the data and then respond */
 636 static int client_certificate(s)
 637 SSL *s;
 638         {
 639         unsigned char *buf;
 640         unsigned char *p,*d;
 641         int i;
 642         unsigned int n;
 643         int cert_ch_len=0;
 644         unsigned char *cert_ch;
 645
 646         buf=(unsigned char *)s->init_buf->data;
 647         cert_ch= &(buf[2]);
 648
 649         /* We have a cert associated with the SSL, so attach it to
 650          * the session if it does not have one */
 651
 652         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
 653                 {
 654                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
 655                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
 656                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
 657                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
 658
 659                 /* type=buf[0]; */
 660                 /* type eq x509 */
 661                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 662                         {
 663                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 664                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
 665                         return(-1);
 666                         }
 667                 cert_ch_len=i-1;
 668
 669                 if ((s->cert == NULL) ||
 670                         (s->cert->key->x509 == NULL) ||
 671                         (s->cert->key->privatekey == NULL))
 672                         {
 673                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
 674                         }
 675                 else
 676                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 677                 }
 678
 679         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
 680                 {
 681                 X509 *x509=NULL;
 682                 EVP_PKEY *pkey=NULL;
 683
 684                 /* If we get an error we need to
 685                  * ssl->rwstate=SSL_X509_LOOKUP;
 686                  * return(error);
 687                  * We should then be retried when things are ok and we
 688                  * can get a cert or not */
 689
 690                 i=0;
 691                 if (s->ctx->client_cert_cb != NULL)
 692                         {
 693                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
 694                         }
 695
 696                 if (i < 0)
 697                         {
 698                         s->rwstate=SSL_X509_LOOKUP;
 699                         return(-1);
 700                         }
 701                 s->rwstate=SSL_NOTHING;
 702
 703                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
 704                         {
 705                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 706                         if (    !SSL_use_certificate(s,x509) ||
 707                                 !SSL_use_PrivateKey(s,pkey))
 708                                 {
 709                                 i=0;
 710                                 }
 711                         X509_free(x509);
 712                         EVP_PKEY_free(pkey);
 713                         }
 714                 else if (i == 1)
 715                         {
 716                         if (x509 != NULL) X509_free(x509);
 717                         if (pkey != NULL) EVP_PKEY_free(pkey);
 718                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
 719                         i=0;
 720                         }
 721
 722                 if (i == 0)
 723                         {
 724                         /* We have no client certificate to respond with
 725                          * so send the correct error message back */
 726                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
 727                         p=buf;
 728                         *(p++)=SSL2_MT_ERROR;
 729                         s2n(SSL2_PE_NO_CERTIFICATE,p);
 730                         s->init_off=0;
 731                         s->init_num=3;
 732                         /* Write is done at the end */
 733                         }
 734                 }
 735
 736         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
 737                 {
 738                 return(ssl2_do_write(s));
 739                 }
 740
 741         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
 742                 {
 743                 EVP_MD_CTX ctx;
 744
 745                 /* ok, now we calculate the checksum
 746                  * do it first so we can reuse buf :-) */
 747                 p=buf;
 748                 EVP_SignInit(&ctx,s->ctx->rsa_md5);
 749                 EVP_SignUpdate(&ctx,s->s2->key_material,
 750                         (unsigned int)s->s2->key_material_length);
 751                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
 752                 n=i2d_X509(s->session->cert->key->x509,&p);
 753                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
 754
 755                 p=buf;
 756                 d=p+6;
 757                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
 758                 *(p++)=SSL2_CT_X509_CERTIFICATE;
 759                 n=i2d_X509(s->cert->key->x509,&d);
 760                 s2n(n,p);
 761
 762                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
 763                         {
 764                         /* this is not good.  If things have failed it
 765                          * means there so something wrong with the key.
 766                          * We will contiune with a 0 length signature
 767                          */
 768                         }
 769                 memset(&ctx,0,sizeof(ctx));
 770                 s2n(n,p);
 771                 d+=n;
 772
 773                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
 774                 s->init_num=d-buf;
 775                 s->init_off=0;
 776                 }
 777         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
 778         return(ssl2_do_write(s));
 779         }
 780
 781 static int get_server_verify(s)
 782 SSL *s;
 783         {
 784         unsigned char *p;
 785         int i;
 786
 787         p=(unsigned char *)s->init_buf->data;
 788         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
 789                 {
 790                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 791                 if (i < (1-s->init_num))
 792                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 793
 794                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
 795                 s->init_num=0;
 796                 if (*p != SSL2_MT_SERVER_VERIFY)
 797                         {
 798                         if (p[0] != SSL2_MT_ERROR)
 799                                 {
 800                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 801                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 802                                         SSL_R_READ_WRONG_PACKET_TYPE);
 803                                 }
 804                         else
 805                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 806                                         SSL_R_PEER_ERROR);
 807                         return(-1);
 808                         }
 809                 }
 810
 811         p=(unsigned char *)s->init_buf->data;
 812         i=ssl2_read(s,(char *)&(p[s->init_num]),
 813                 (unsigned int)s->s2->challenge_length-s->init_num);
 814         if (i < ((int)s->s2->challenge_length-s->init_num))
 815                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 816         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
 817                 {
 818                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 819                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
 820                 return(-1);
 821                 }
 822         return(1);
 823         }
 824
 825 static int get_server_finished(s)
 826 SSL *s;
 827         {
 828         unsigned char *buf;
 829         unsigned char *p;
 830         int i;
 831
 832         buf=(unsigned char *)s->init_buf->data;
 833         p=buf;
 834         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
 835                 {
 836                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
 837                 if (i < (1-s->init_num))
 838                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 839                 s->init_num=i;
 840                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
 841                         {
 842                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
 843                         return(1);
 844                         }
 845                 else if (*p != SSL2_MT_SERVER_FINISHED)
 846                         {
 847                         if (p[0] != SSL2_MT_ERROR)
 848                                 {
 849                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 850                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 851                                 }
 852                         else
 853                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
 854                         return(-1);
 855                         }
 856                 s->state=SSL_ST_OK;
 857                 s->init_num=0;
 858                 }
 859
 860         i=ssl2_read(s,(char *)&(buf[s->init_num]),
 861                 SSL2_SSL_SESSION_ID_LENGTH-s->init_num);
 862         if (i < (SSL2_SSL_SESSION_ID_LENGTH-s->init_num))
 863                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 864
 865         if (!s->hit) /* new session */
 866                 {
 867                 /* new session-id */
 868                 /* Make sure we were not trying to re-use an old SSL_SESSION
 869                  * or bad things can happen */
 870                 /* ZZZZZZZZZZZZZ */
 871                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
 872                 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH);
 873                 }
 874         else
 875                 {
 876                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
 877                         {
 878                         if (memcmp(buf,s->session->session_id,
 879                                 (unsigned int)s->session->session_id_length) != 0)
 880                                 {
 881                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 882                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
 883                                 return(-1);
 884                                 }
 885                         }
 886                 }
 887         return(1);
 888         }
 889
 890 /* loads in the certificate from the server */
 891 int ssl2_set_certificate(s, type, len, data)
 892 SSL *s;
 893 int type;
 894 int len;
 895 unsigned char *data;
 896         {
 897         STACK *sk=NULL;
 898         EVP_PKEY *pkey=NULL;
 899         CERT *c=NULL;
 900         int i;
 901         X509 *x509=NULL;
 902         int ret=0;
 903
 904         x509=d2i_X509(NULL,&data,(long)len);
 905         if (x509 == NULL)
 906                 {
 907                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
 908                 goto err;
 909                 }
 910
 911         if (((sk=sk_new_null()) == NULL) ||
 912                 (!sk_push(sk,(char *)x509)))
 913                 {
 914                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 915                 goto err;
 916                 }
 917
 918         i=ssl_verify_cert_chain(s,sk);
 919
 920         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 921                 {
 922                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 923                 goto err;
 924                 }
 925
 926         /* cert for ssl */
 927         c=ssl_cert_new();
 928         if (c == NULL)
 929                 {
 930                 ret= -1;
 931                 goto err;
 932                 }
 933
 934         /* cert for session */
 935         if (s->session->cert) ssl_cert_free(s->session->cert);
 936         s->session->cert=c;
 937
 938 /*      c->cert_type=type; */
 939
 940         c->pkeys[SSL_PKEY_RSA_ENC].x509=x509;
 941         c->key= &(c->pkeys[SSL_PKEY_RSA_ENC]);
 942
 943         pkey=X509_get_pubkey(x509);
 944         x509=NULL;
 945         if (pkey == NULL)
 946                 {
 947                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
 948                 goto err;
 949                 }
 950         if (pkey->type != EVP_PKEY_RSA)
 951                 {
 952                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
 953                 goto err;
 954                 }
 955
 956         if (!ssl_set_cert_type(c,SSL2_CT_X509_CERTIFICATE))
 957                 goto err;
 958         ret=1;
 959 err:
 960         sk_free(sk);
 961         X509_free(x509);
 962         EVP_PKEY_free(pkey);
 963         return(ret);
 964         }
 965
 966 static int ssl_rsa_public_encrypt(c, len, from, to, padding)
 967 CERT *c;
 968 int len;
 969 unsigned char *from;
 970 unsigned char *to;
 971 int padding;
 972         {
 973         EVP_PKEY *pkey=NULL;
 974         int i= -1;
 975
 976         if ((c == NULL) || (c->key->x509 == NULL) ||
 977                 ((pkey=X509_get_pubkey(c->key->x509)) == NULL))
 978                 {
 979                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
 980                 return(-1);
 981                 }
 982         if (pkey->type != EVP_PKEY_RSA)
 983                 {
 984                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 985                 goto end;
 986                 }
 987
 988         /* we have the public key */
 989         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
 990         if (i < 0)
 991                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
 992 end:
 993         EVP_PKEY_free(pkey);
 994         return(i);
 995         }
 996