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(SESS_CERT *sc, int len, unsigned char *from,
  76         unsigned char *to,int padding);
  77 #define BREAK   break
  78
  79 static SSL_METHOD *ssl2_get_client_method(int ver)
  80         {
  81         if (ver == SSL2_VERSION)
  82                 return(SSLv2_client_method());
  83         else
  84                 return(NULL);
  85         }
  86
  87 SSL_METHOD *SSLv2_client_method(void)
  88         {
  89         static int init=1;
  90         static SSL_METHOD SSLv2_client_data;
  91
  92         if (init)
  93                 {
  94                 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
  95                         sizeof(SSL_METHOD));
  96                 SSLv2_client_data.ssl_connect=ssl2_connect;
  97                 SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
  98                 init=0;
  99                 }
 100         return(&SSLv2_client_data);
 101         }
 102
 103 int ssl2_connect(SSL *s)
 104         {
 105         unsigned long l=time(NULL);
 106         BUF_MEM *buf=NULL;
 107         int ret= -1;
 108         void (*cb)()=NULL;
 109         int new_state,state;
 110
 111         RAND_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->peer != NULL)
 435                 X509_free(s->session->peer);
 436
 437 #if 0 /* What is all this meant to accomplish?? */
 438         /* hmmm, can we have the problem of the other session with this
 439          * cert, Free's it before we increment the reference count. */
 440         CRYPTO_w_lock(CRYPTO_LOCK_X509);
 441         s->session->peer=s->session->sess_cert->key->x509;
 442         /* Shouldn't do this: already locked */
 443         /*CRYPTO_add(&s->session->peer->references,1,CRYPTO_LOCK_X509);*/
 444         s->session->peer->references++;
 445         CRYPTO_w_unlock(CRYPTO_LOCK_X509);
 446 #else
 447         s->session->peer = s->session->sess_cert->peer_key->x509;
 448     /* peer_key->x509 has been set by ssl2_set_certificate. */
 449         CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
 450 #endif
 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(SSL *s)
 458         {
 459         unsigned char *buf;
 460         unsigned char *p,*d;
 461 /*      CIPHER **cipher;*/
 462         int i,n,j;
 463
 464         buf=(unsigned char *)s->init_buf->data;
 465         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
 466                 {
 467                 if ((s->session == NULL) ||
 468                         (s->session->ssl_version != s->version))
 469                         {
 470                         if (!ssl_get_new_session(s,0))
 471                                 {
 472                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 473                                 return(-1);
 474                                 }
 475                         }
 476                 /* else use the pre-loaded session */
 477
 478                 p=buf;                                  /* header */
 479                 d=p+9;                                  /* data section */
 480                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
 481                 s2n(SSL2_VERSION,p);                    /* version */
 482                 n=j=0;
 483
 484                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d);
 485                 d+=n;
 486
 487                 if (n == 0)
 488                         {
 489                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 490                         return(-1);
 491                         }
 492
 493                 s2n(n,p);                       /* cipher spec num bytes */
 494
 495                 if ((s->session->session_id_length > 0) &&
 496                         (s->session->session_id_length <=
 497                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
 498                         {
 499                         i=s->session->session_id_length;
 500                         s2n(i,p);               /* session id length */
 501                         memcpy(d,s->session->session_id,(unsigned int)i);
 502                         d+=i;
 503                         }
 504                 else
 505                         {
 506                         s2n(0,p);
 507                         }
 508
 509                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
 510                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
 511                 /*challenge id data*/
 512                 RAND_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 513                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 514                 d+=SSL2_CHALLENGE_LENGTH;
 515
 516                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
 517                 s->init_num=d-buf;
 518                 s->init_off=0;
 519                 }
 520         /* SSL2_ST_SEND_CLIENT_HELLO_B */
 521         return(ssl2_do_write(s));
 522         }
 523
 524 static int client_master_key(SSL *s)
 525         {
 526         unsigned char *buf;
 527         unsigned char *p,*d;
 528         int clear,enc,karg,i;
 529         SSL_SESSION *sess;
 530         const EVP_CIPHER *c;
 531         const EVP_MD *md;
 532
 533         buf=(unsigned char *)s->init_buf->data;
 534         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
 535                 {
 536
 537                 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
 538                         {
 539                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 540                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 541                         return(-1);
 542                         }
 543                 sess=s->session;
 544                 p=buf;
 545                 d=p+10;
 546                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
 547
 548                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
 549                 p+=i;
 550
 551                 /* make key_arg data */
 552                 i=EVP_CIPHER_iv_length(c);
 553                 sess->key_arg_length=i;
 554                 if (i > 0) RAND_bytes(sess->key_arg,i);
 555
 556                 /* make a master key */
 557                 i=EVP_CIPHER_key_length(c);
 558                 sess->master_key_length=i;
 559                 if (i > 0) RAND_bytes(sess->master_key,i);
 560
 561                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 562                         enc=8;
 563                 else if (SSL_C_IS_EXPORT(sess->cipher))
 564                         enc=5;
 565                 else
 566                         enc=i;
 567
 568                 if (i < enc)
 569                         {
 570                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 571                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
 572                         return(-1);
 573                         }
 574                 clear=i-enc;
 575                 s2n(clear,p);
 576                 memcpy(d,sess->master_key,(unsigned int)clear);
 577                 d+=clear;
 578
 579                 enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
 580                         &(sess->master_key[clear]),d,
 581                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 582                 if (enc <= 0)
 583                         {
 584                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 585                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
 586                         return(-1);
 587                         }
 588 #ifdef PKCS1_CHECK
 589                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
 590                 if (s->options & SSL_OP_PKCS1_CHECK_2)
 591                         sess->master_key[clear]++;
 592 #endif
 593                 s2n(enc,p);
 594                 d+=enc;
 595                 karg=sess->key_arg_length;
 596                 s2n(karg,p); /* key arg size */
 597                 memcpy(d,sess->key_arg,(unsigned int)karg);
 598                 d+=karg;
 599
 600                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
 601                 s->init_num=d-buf;
 602                 s->init_off=0;
 603                 }
 604
 605         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
 606         return(ssl2_do_write(s));
 607         }
 608
 609 static int client_finished(SSL *s)
 610         {
 611         unsigned char *p;
 612
 613         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
 614                 {
 615                 p=(unsigned char *)s->init_buf->data;
 616                 *(p++)=SSL2_MT_CLIENT_FINISHED;
 617                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
 618
 619                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
 620                 s->init_num=s->s2->conn_id_length+1;
 621                 s->init_off=0;
 622                 }
 623         return(ssl2_do_write(s));
 624         }
 625
 626 /* read the data and then respond */
 627 static int client_certificate(SSL *s)
 628         {
 629         unsigned char *buf;
 630         unsigned char *p,*d;
 631         int i;
 632         unsigned int n;
 633         int cert_ch_len=0;
 634         unsigned char *cert_ch;
 635
 636         buf=(unsigned char *)s->init_buf->data;
 637         cert_ch= &(buf[2]);
 638
 639         /* We have a cert associated with the SSL, so attach it to
 640          * the session if it does not have one */
 641
 642         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
 643                 {
 644                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
 645                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
 646                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
 647                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
 648
 649                 /* type=buf[0]; */
 650                 /* type eq x509 */
 651                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 652                         {
 653                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 654                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
 655                         return(-1);
 656                         }
 657                 cert_ch_len=i-1;
 658
 659                 if ((s->cert == NULL) ||
 660                         (s->cert->key->x509 == NULL) ||
 661                         (s->cert->key->privatekey == NULL))
 662                         {
 663                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
 664                         }
 665                 else
 666                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 667                 }
 668
 669         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
 670                 {
 671                 X509 *x509=NULL;
 672                 EVP_PKEY *pkey=NULL;
 673
 674                 /* If we get an error we need to
 675                  * ssl->rwstate=SSL_X509_LOOKUP;
 676                  * return(error);
 677                  * We should then be retried when things are ok and we
 678                  * can get a cert or not */
 679
 680                 i=0;
 681                 if (s->ctx->client_cert_cb != NULL)
 682                         {
 683                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
 684                         }
 685
 686                 if (i < 0)
 687                         {
 688                         s->rwstate=SSL_X509_LOOKUP;
 689                         return(-1);
 690                         }
 691                 s->rwstate=SSL_NOTHING;
 692
 693                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
 694                         {
 695                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 696                         if (    !SSL_use_certificate(s,x509) ||
 697                                 !SSL_use_PrivateKey(s,pkey))
 698                                 {
 699                                 i=0;
 700                                 }
 701                         X509_free(x509);
 702                         EVP_PKEY_free(pkey);
 703                         }
 704                 else if (i == 1)
 705                         {
 706                         if (x509 != NULL) X509_free(x509);
 707                         if (pkey != NULL) EVP_PKEY_free(pkey);
 708                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
 709                         i=0;
 710                         }
 711
 712                 if (i == 0)
 713                         {
 714                         /* We have no client certificate to respond with
 715                          * so send the correct error message back */
 716                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
 717                         p=buf;
 718                         *(p++)=SSL2_MT_ERROR;
 719                         s2n(SSL2_PE_NO_CERTIFICATE,p);
 720                         s->init_off=0;
 721                         s->init_num=3;
 722                         /* Write is done at the end */
 723                         }
 724                 }
 725
 726         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
 727                 {
 728                 return(ssl2_do_write(s));
 729                 }
 730
 731         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
 732                 {
 733                 EVP_MD_CTX ctx;
 734
 735                 /* ok, now we calculate the checksum
 736                  * do it first so we can reuse buf :-) */
 737                 p=buf;
 738                 EVP_SignInit(&ctx,s->ctx->rsa_md5);
 739                 EVP_SignUpdate(&ctx,s->s2->key_material,
 740                         (unsigned int)s->s2->key_material_length);
 741                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
 742                 n=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
 743                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
 744
 745                 p=buf;
 746                 d=p+6;
 747                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
 748                 *(p++)=SSL2_CT_X509_CERTIFICATE;
 749                 n=i2d_X509(s->cert->key->x509,&d);
 750                 s2n(n,p);
 751
 752                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
 753                         {
 754                         /* this is not good.  If things have failed it
 755                          * means there so something wrong with the key.
 756                          * We will contiune with a 0 length signature
 757                          */
 758                         }
 759                 memset(&ctx,0,sizeof(ctx));
 760                 s2n(n,p);
 761                 d+=n;
 762
 763                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
 764                 s->init_num=d-buf;
 765                 s->init_off=0;
 766                 }
 767         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
 768         return(ssl2_do_write(s));
 769         }
 770
 771 static int get_server_verify(SSL *s)
 772         {
 773         unsigned char *p;
 774         int i;
 775
 776         p=(unsigned char *)s->init_buf->data;
 777         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
 778                 {
 779                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 780                 if (i < (1-s->init_num))
 781                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 782
 783                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
 784                 s->init_num=0;
 785                 if (*p != SSL2_MT_SERVER_VERIFY)
 786                         {
 787                         if (p[0] != SSL2_MT_ERROR)
 788                                 {
 789                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 790                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 791                                         SSL_R_READ_WRONG_PACKET_TYPE);
 792                                 }
 793                         else
 794                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 795                                         SSL_R_PEER_ERROR);
 796                         return(-1);
 797                         }
 798                 }
 799
 800         p=(unsigned char *)s->init_buf->data;
 801         i=ssl2_read(s,(char *)&(p[s->init_num]),
 802                 (unsigned int)s->s2->challenge_length-s->init_num);
 803         if (i < ((int)s->s2->challenge_length-s->init_num))
 804                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 805         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
 806                 {
 807                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 808                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
 809                 return(-1);
 810                 }
 811         return(1);
 812         }
 813
 814 static int get_server_finished(SSL *s)
 815         {
 816         unsigned char *buf;
 817         unsigned char *p;
 818         int i;
 819
 820         buf=(unsigned char *)s->init_buf->data;
 821         p=buf;
 822         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
 823                 {
 824                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
 825                 if (i < (1-s->init_num))
 826                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 827                 s->init_num=i;
 828                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
 829                         {
 830                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
 831                         return(1);
 832                         }
 833                 else if (*p != SSL2_MT_SERVER_FINISHED)
 834                         {
 835                         if (p[0] != SSL2_MT_ERROR)
 836                                 {
 837                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 838                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 839                                 }
 840                         else
 841                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
 842                         return(-1);
 843                         }
 844                 s->state=SSL_ST_OK;
 845                 s->init_num=0;
 846                 }
 847
 848         i=ssl2_read(s,(char *)&(buf[s->init_num]),
 849                 SSL2_SSL_SESSION_ID_LENGTH-s->init_num);
 850         if (i < (SSL2_SSL_SESSION_ID_LENGTH-s->init_num))
 851                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 852
 853         if (!s->hit) /* new session */
 854                 {
 855                 /* new session-id */
 856                 /* Make sure we were not trying to re-use an old SSL_SESSION
 857                  * or bad things can happen */
 858                 /* ZZZZZZZZZZZZZ */
 859                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
 860                 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH);
 861                 }
 862         else
 863                 {
 864                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
 865                         {
 866                         if (memcmp(buf,s->session->session_id,
 867                                 (unsigned int)s->session->session_id_length) != 0)
 868                                 {
 869                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 870                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
 871                                 return(-1);
 872                                 }
 873                         }
 874                 }
 875         return(1);
 876         }
 877
 878 /* loads in the certificate from the server */
 879 int ssl2_set_certificate(SSL *s, int type, int len, unsigned char *data)
 880         {
 881         STACK_OF(X509) *sk=NULL;
 882         EVP_PKEY *pkey=NULL;
 883         SESS_CERT *sc=NULL;
 884         int i;
 885         X509 *x509=NULL;
 886         int ret=0;
 887
 888         x509=d2i_X509(NULL,&data,(long)len);
 889         if (x509 == NULL)
 890                 {
 891                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
 892                 goto err;
 893                 }
 894
 895         if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
 896                 {
 897                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 898                 goto err;
 899                 }
 900
 901         i=ssl_verify_cert_chain(s,sk);
 902
 903         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 904                 {
 905                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 906                 goto err;
 907                 }
 908
 909         /* server's cert for this session */
 910         sc=ssl_sess_cert_new();
 911         if (sc == NULL)
 912                 {
 913                 ret= -1;
 914                 goto err;
 915                 }
 916         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 917         s->session->sess_cert=sc;
 918
 919         sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
 920         sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);
 921
 922         pkey=X509_get_pubkey(x509);
 923         x509=NULL;
 924         if (pkey == NULL)
 925                 {
 926                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
 927                 goto err;
 928                 }
 929         if (pkey->type != EVP_PKEY_RSA)
 930                 {
 931                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
 932                 goto err;
 933                 }
 934
 935         if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
 936                 goto err;
 937         ret=1;
 938 err:
 939         sk_X509_free(sk);
 940         X509_free(x509);
 941         EVP_PKEY_free(pkey);
 942         return(ret);
 943         }
 944
 945 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
 946              unsigned char *to, int padding)
 947         {
 948         EVP_PKEY *pkey=NULL;
 949         int i= -1;
 950
 951         if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
 952                 ((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
 953                 {
 954                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
 955                 return(-1);
 956                 }
 957         if (pkey->type != EVP_PKEY_RSA)
 958                 {
 959                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 960                 goto end;
 961                 }
 962
 963         /* we have the public key */
 964         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
 965         if (i < 0)
 966                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
 967 end:
 968         EVP_PKEY_free(pkey);
 969         return(i);
 970         }
 971 #endif