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