ssl/s2_clnt.c

   1 /* ssl/s2_clnt.c */
   2 /* Copyright (C) 1995-1997 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 #ifndef NO_MD5
  61 #include "md5.h"
  62 #endif
  63 #include "rand.h"
  64 #include "buffer.h"
  65 #include "objects.h"
  66 #include "ssl_locl.h"
  67 #include "evp.h"
  68
  69 #ifndef NOPROTO
  70 static int get_server_finished(SSL *s);
  71 static int get_server_verify(SSL *s);
  72 static int get_server_hello(SSL *s);
  73 static int client_hello(SSL *s);
  74 static int client_master_key(SSL *s);
  75 static int client_finished(SSL *s);
  76 static int client_certificate(SSL *s);
  77 static int ssl_rsa_public_encrypt(CERT *c, int len, unsigned char *from,
  78         unsigned char *to,int padding);
  79 #else
  80 static int get_server_finished();
  81 static int get_server_verify();
  82 static int get_server_hello();
  83 static int client_hello();
  84 static int client_master_key();
  85 static int client_finished();
  86 static int client_certificate();
  87 static int ssl_rsa_public_encrypt();
  88 #endif
  89
  90 #define BREAK   break
  91
  92 static SSL_METHOD *ssl2_get_client_method(ver)
  93 int ver;
  94         {
  95         if (ver == 2)
  96                 return(SSLv2_client_method());
  97         else
  98                 return(NULL);
  99         }
 100
 101 SSL_METHOD *SSLv2_client_method()
 102         {
 103         static int init=1;
 104         static SSL_METHOD SSLv2_client_data;
 105
 106         if (init)
 107                 {
 108                 init=0;
 109                 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
 110                         sizeof(SSL_METHOD));
 111                 SSLv2_client_data.ssl_connect=ssl2_connect;
 112                 SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
 113                 }
 114         return(&SSLv2_client_data);
 115         }
 116
 117 int ssl2_connect(s)
 118 SSL *s;
 119         {
 120         unsigned long l=time(NULL);
 121         BUF_MEM *buf=NULL;
 122         int ret= -1;
 123         void (*cb)()=NULL;
 124         int new_state,state;
 125
 126         RAND_seed((unsigned char *)&l,sizeof(l));
 127         ERR_clear_error();
 128         errno=0;
 129
 130         if (s->info_callback != NULL)
 131                 cb=s->info_callback;
 132         else if (s->ctx->info_callback != NULL)
 133                 cb=s->ctx->info_callback;
 134
 135         /* init things to blank */
 136         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 137         s->in_handshake++;
 138
 139         for (;;)
 140                 {
 141                 state=s->state;
 142
 143                 switch (s->state)
 144                         {
 145                 case SSL_ST_BEFORE:
 146                 case SSL_ST_CONNECT:
 147                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 148                 case SSL_ST_OK|SSL_ST_CONNECT:
 149
 150                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 151
 152                         s->version=2;
 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->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                         BUF_MEM_free(s->init_buf);
 254                         s->init_buf=NULL;
 255                         s->init_num=0;
 256                 /*      ERR_clear_error();*/
 257
 258                         /* If we want to cache session-ids in the client
 259                          * and we sucessfully add the session-id to the
 260                          * cache, and there is a callback, then pass it out.
 261                          * 26/11/96 - eay - only add if not a re-used session.
 262                          */
 263
 264                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 265
 266                         ret=1;
 267                         /* s->server=0; */
 268                         s->ctx->sess_connect_good++;
 269
 270                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 271
 272                         goto end;
 273                         break;
 274                 default:
 275                         SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
 276                         return(-1);
 277                         /* break; */
 278                         }
 279
 280                 if ((cb != NULL) && (s->state != state))
 281                         {
 282                         new_state=s->state;
 283                         s->state=state;
 284                         cb(s,SSL_CB_CONNECT_LOOP,1);
 285                         s->state=new_state;
 286                         }
 287                 }
 288 end:
 289         s->in_handshake--;
 290         if (cb != NULL)
 291                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 292         return(ret);
 293         }
 294
 295 static int get_server_hello(s)
 296 SSL *s;
 297         {
 298         unsigned char *buf;
 299         unsigned char *p;
 300         int i,j;
 301         STACK *sk,*cl;
 302
 303         buf=(unsigned char *)s->init_buf->data;
 304         p=buf;
 305         if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
 306                 {
 307                 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
 308                 if (i < (11-s->init_num))
 309                         return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 310
 311                 if (*(p++) != SSL2_MT_SERVER_HELLO)
 312                         {
 313                         if (p[-1] != SSL2_MT_ERROR)
 314                                 {
 315                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 316                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 317                                         SSL_R_READ_WRONG_PACKET_TYPE);
 318                                 }
 319                         else
 320                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 321                                         SSL_R_PEER_ERROR);
 322                         return(-1);
 323                         }
 324                 s->hit=(*(p++))?1:0;
 325                 s->s2->tmp.cert_type= *(p++);
 326                 n2s(p,i);
 327                 if (i < s->version) s->version=i;
 328                 n2s(p,i); s->s2->tmp.cert_length=i;
 329                 n2s(p,i); s->s2->tmp.csl=i;
 330                 n2s(p,i); s->s2->tmp.conn_id_length=i;
 331                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
 332                 s->init_num=0;
 333                 }
 334
 335         /* SSL2_ST_GET_SERVER_HELLO_B */
 336         j=s->s2->tmp.cert_length+s->s2->tmp.csl+s->s2->tmp.conn_id_length
 337                 - s->init_num;
 338         i=ssl2_read(s,(char *)&(buf[s->init_num]),j);
 339         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 340
 341         /* things are looking good */
 342
 343         p=buf;
 344         if (s->hit)
 345                 {
 346                 if (s->s2->tmp.cert_length != 0)
 347                         {
 348                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
 349                         return(-1);
 350                         }
 351                 if (s->s2->tmp.cert_type != 0)
 352                         {
 353                         if (!(s->ctx->options &
 354                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
 355                                 {
 356                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
 357                                 return(-1);
 358                                 }
 359                         }
 360                 if (s->s2->tmp.csl != 0)
 361                         {
 362                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
 363                         return(-1);
 364                         }
 365                 }
 366         else
 367                 {
 368 #ifdef undef
 369                 /* very bad */
 370                 memset(s->session->session_id,0,
 371                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
 372                 s->session->session_id_length=0;
 373                 */
 374 #endif
 375
 376                 /* we need to do this incase we were trying to reuse a
 377                  * client session but others are already reusing it.
 378                  * If this was a new 'blank' session ID, the session-id
 379                  * length will still be 0 */
 380                 if (s->session->session_id_length > 0)
 381                         {
 382                         if (!ssl_get_new_session(s,0))
 383                                 {
 384                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 385                                 return(-1);
 386                                 }
 387                         }
 388
 389                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
 390                         s->s2->tmp.cert_length,p) <= 0)
 391                         {
 392                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 393                         return(-1);
 394                         }
 395                 p+=s->s2->tmp.cert_length;
 396
 397                 if (s->s2->tmp.csl == 0)
 398                         {
 399                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 400                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
 401                         return(-1);
 402                         }
 403
 404                 /* We have just received a list of ciphers back from the
 405                  * server.  We need to get the ones that match, then select
 406                  * the one we want the most :-). */
 407
 408                 /* load the ciphers */
 409                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
 410                         &s->session->ciphers);
 411                 p+=s->s2->tmp.csl;
 412                 if (sk == NULL)
 413                         {
 414                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 415                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
 416                         return(-1);
 417                         }
 418
 419                 sk_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
 420
 421                 /* get the array of ciphers we will accept */
 422                 cl=ssl_get_ciphers_by_id(s);
 423
 424                 /* In theory we could have ciphers sent back that we
 425                  * don't want to use but that does not matter since we
 426                  * will check against the list we origionally sent and
 427                  * for performance reasons we should not bother to match
 428                  * the two lists up just to check. */
 429                 for (i=0; i<sk_num(cl); i++)
 430                         {
 431                         if (sk_find(sk,sk_value(cl,i)) >= 0)
 432                                 break;
 433                         }
 434
 435                 if (i >= sk_num(cl))
 436                         {
 437                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 438                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
 439                         return(-1);
 440                         }
 441                 s->session->cipher=(SSL_CIPHER *)sk_value(cl,i);
 442                 }
 443
 444         if ((s->session != NULL) && (s->session->peer != NULL))
 445                 X509_free(s->session->peer);
 446
 447         /* hmmm, can we have the problem of the other session with this
 448          * cert, Free's it before we increment the reference count. */
 449         CRYPTO_w_lock(CRYPTO_LOCK_X509);
 450         s->session->peer=s->session->cert->key->x509;
 451         s->session->peer->references++;
 452         CRYPTO_w_unlock(CRYPTO_LOCK_X509);
 453
 454         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
 455         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
 456         return(1);
 457         }
 458
 459 static int client_hello(s)
 460 SSL *s;
 461         {
 462         unsigned char *buf;
 463         unsigned char *p,*d;
 464 /*      CIPHER **cipher;*/
 465         int i,n,j;
 466
 467         buf=(unsigned char *)s->init_buf->data;
 468         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
 469                 {
 470                 if ((s->session == NULL) ||
 471                         (s->session->ssl_version != s->version))
 472                         {
 473                         if (!ssl_get_new_session(s,0))
 474                                 {
 475                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 476                                 return(-1);
 477                                 }
 478                         }
 479                 /* else use the pre-loaded session */
 480
 481                 p=buf;                                  /* header */
 482                 d=p+9;                                  /* data section */
 483                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
 484                 s2n(SSL2_CLIENT_VERSION,p);             /* version */
 485                 n=j=0;
 486
 487                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d);
 488                 d+=n;
 489
 490                 if (n == 0)
 491                         {
 492                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 493                         return(-1);
 494                         }
 495
 496                 s2n(n,p);                       /* cipher spec num bytes */
 497
 498                 if ((s->session->session_id_length > 0) &&
 499                         (s->session->session_id_length <=
 500                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
 501                         {
 502                         i=s->session->session_id_length;
 503                         s2n(i,p);               /* session id length */
 504                         memcpy(d,s->session->session_id,(unsigned int)i);
 505                         d+=i;
 506                         }
 507                 else
 508                         {
 509                         s2n(0,p);
 510                         }
 511
 512                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
 513                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
 514                 /*challenge id data*/
 515                 RAND_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 516                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 517                 d+=SSL2_CHALLENGE_LENGTH;
 518
 519                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
 520                 s->init_num=d-buf;
 521                 s->init_off=0;
 522                 }
 523         /* SSL2_ST_SEND_CLIENT_HELLO_B */
 524         return(ssl2_do_write(s));
 525         }
 526
 527 static int client_master_key(s)
 528 SSL *s;
 529         {
 530         unsigned char *buf;
 531         unsigned char *p,*d;
 532         int clear,enc,karg,i;
 533         SSL_SESSION *sess;
 534         EVP_CIPHER *c;
 535         EVP_MD *md;
 536
 537         buf=(unsigned char *)s->init_buf->data;
 538         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
 539                 {
 540
 541                 if (!ssl_cipher_get_evp(s->session->cipher,&c,&md))
 542                         {
 543                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 544                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 545                         return(-1);
 546                         }
 547                 sess=s->session;
 548                 p=buf;
 549                 d=p+10;
 550                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
 551
 552                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
 553                 p+=i;
 554
 555                 /* make key_arg data */
 556                 i=EVP_CIPHER_iv_length(c);
 557                 sess->key_arg_length=i;
 558                 if (i > 0) RAND_bytes(sess->key_arg,i);
 559
 560                 /* make a master key */
 561                 i=EVP_CIPHER_key_length(c);
 562                 sess->master_key_length=i;
 563                 if (i > 0) RAND_bytes(sess->master_key,i);
 564
 565                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 566                         enc=8;
 567                 else if (sess->cipher->algorithms & SSL_EXP)
 568                         enc=5;
 569                 else
 570                         enc=i;
 571
 572                 if (i < enc)
 573                         {
 574                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 575                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
 576                         return(-1);
 577                         }
 578                 clear=i-enc;
 579                 s2n(clear,p);
 580                 memcpy(d,sess->master_key,(unsigned int)clear);
 581                 d+=clear;
 582
 583                 enc=ssl_rsa_public_encrypt(sess->cert,enc,
 584                         &(sess->master_key[clear]),d,
 585                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 586                 if (enc <= 0)
 587                         {
 588                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 589                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
 590                         return(-1);
 591                         }
 592                 s2n(enc,p);
 593                 d+=enc;
 594                 karg=sess->key_arg_length;
 595                 s2n(karg,p); /* key arg size */
 596                 memcpy(d,sess->key_arg,(unsigned int)karg);
 597                 d+=karg;
 598
 599                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
 600                 s->init_num=d-buf;
 601                 s->init_off=0;
 602                 }
 603
 604         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
 605         return(ssl2_do_write(s));
 606         }
 607
 608 static int client_finished(s)
 609 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(s)
 628 SSL *s;
 629         {
 630         unsigned char *buf;
 631         unsigned char *p,*d;
 632         int i;
 633         unsigned int n;
 634         int cert_ch_len=0;
 635         unsigned char *cert_ch;
 636
 637         buf=(unsigned char *)s->init_buf->data;
 638         cert_ch= &(buf[2]);
 639
 640         /* We have a cert associated with the SSL, so attach it to
 641          * the session if it does not have one */
 642
 643         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
 644                 {
 645                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
 646                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
 647                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
 648                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
 649
 650                 /* type=buf[0]; */
 651                 /* type eq x509 */
 652                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 653                         {
 654                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 655                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
 656                         return(-1);
 657                         }
 658                 cert_ch_len=i-1;
 659
 660                 if ((s->cert == NULL) ||
 661                         (s->cert->key->x509 == NULL) ||
 662                         (s->cert->key->privatekey == NULL))
 663                         {
 664                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
 665                         }
 666                 else
 667                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 668                 }
 669
 670         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
 671                 {
 672                 X509 *x509=NULL;
 673                 EVP_PKEY *pkey=NULL;
 674
 675                 /* If we get an error we need to
 676                  * ssl->rwstate=SSL_X509_LOOKUP;
 677                  * return(error);
 678                  * We should then be retried when things are ok and we
 679                  * can get a cert or not */
 680
 681                 i=0;
 682                 if (s->ctx->client_cert_cb != NULL)
 683                         {
 684                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
 685                         }
 686
 687                 if (i < 0)
 688                         {
 689                         s->rwstate=SSL_X509_LOOKUP;
 690                         return(-1);
 691                         }
 692                 s->rwstate=SSL_NOTHING;
 693
 694                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
 695                         {
 696                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 697                         if (    !SSL_use_certificate(s,x509) ||
 698                                 !SSL_use_PrivateKey(s,pkey))
 699                                 {
 700                                 i=0;
 701                                 }
 702                         X509_free(x509);
 703                         EVP_PKEY_free(pkey);
 704                         }
 705                 else if (i == 1)
 706                         {
 707                         if (x509 != NULL) X509_free(x509);
 708                         if (pkey != NULL) EVP_PKEY_free(pkey);
 709                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
 710                         i=0;
 711                         }
 712
 713                 if (i == 0)
 714                         {
 715                         /* We have no client certificate to respond with
 716                          * so send the correct error message back */
 717                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
 718                         p=buf;
 719                         *(p++)=SSL2_MT_ERROR;
 720                         s2n(SSL2_PE_NO_CERTIFICATE,p);
 721                         s->init_off=0;
 722                         s->init_num=3;
 723                         /* Write is done at the end */
 724                         }
 725                 }
 726
 727         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
 728                 {
 729                 return(ssl2_do_write(s));
 730                 }
 731
 732         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
 733                 {
 734                 EVP_MD_CTX ctx;
 735
 736                 /* ok, now we calculate the checksum
 737                  * do it first so we can reuse buf :-) */
 738                 p=buf;
 739                 EVP_SignInit(&ctx,EVP_md5());
 740                 EVP_SignUpdate(&ctx,s->s2->key_material,
 741                         (unsigned int)s->s2->key_material_length);
 742                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
 743                 n=i2d_X509(s->session->cert->key->x509,&p);
 744                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
 745
 746                 p=buf;
 747                 d=p+6;
 748                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
 749                 *(p++)=SSL2_CT_X509_CERTIFICATE;
 750                 n=i2d_X509(s->cert->key->x509,&d);
 751                 s2n(n,p);
 752
 753                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
 754                         {
 755                         /* this is not good.  If things have failed it
 756                          * means there so something wrong with the key.
 757                          * We will contiune with a 0 length signature
 758                          */
 759                         }
 760                 memset(&ctx,0,sizeof(ctx));
 761                 s2n(n,p);
 762                 d+=n;
 763
 764                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
 765                 s->init_num=d-buf;
 766                 s->init_off=0;
 767                 }
 768         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
 769         return(ssl2_do_write(s));
 770         }
 771
 772 static int get_server_verify(s)
 773 SSL *s;
 774         {
 775         unsigned char *p;
 776         int i;
 777
 778         p=(unsigned char *)s->init_buf->data;
 779         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
 780                 {
 781                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 782                 if (i < (1-s->init_num))
 783                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 784
 785                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
 786                 s->init_num=0;
 787                 if (*p != SSL2_MT_SERVER_VERIFY)
 788                         {
 789                         if (p[0] != SSL2_MT_ERROR)
 790                                 {
 791                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 792                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 793                                         SSL_R_READ_WRONG_PACKET_TYPE);
 794                                 }
 795                         else
 796                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 797                                         SSL_R_PEER_ERROR);
 798                         return(-1);
 799                         }
 800                 }
 801
 802         p=(unsigned char *)s->init_buf->data;
 803         i=ssl2_read(s,(char *)&(p[s->init_num]),
 804                 (unsigned int)s->s2->challenge_length-s->init_num);
 805         if (i < ((int)s->s2->challenge_length-s->init_num))
 806                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 807         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
 808                 {
 809                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 810                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
 811                 return(-1);
 812                 }
 813         return(1);
 814         }
 815
 816 static int get_server_finished(s)
 817 SSL *s;
 818         {
 819         unsigned char *buf;
 820         unsigned char *p;
 821         int i;
 822
 823         buf=(unsigned char *)s->init_buf->data;
 824         p=buf;
 825         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
 826                 {
 827                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
 828                 if (i < (1-s->init_num))
 829                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 830                 s->init_num=i;
 831                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
 832                         {
 833                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
 834                         return(1);
 835                         }
 836                 else if (*p != SSL2_MT_SERVER_FINISHED)
 837                         {
 838                         if (p[0] != SSL2_MT_ERROR)
 839                                 {
 840                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 841                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 842                                 }
 843                         else
 844                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
 845                         return(-1);
 846                         }
 847                 s->state=SSL_ST_OK;
 848                 s->init_num=0;
 849                 }
 850
 851         i=ssl2_read(s,(char *)&(buf[s->init_num]),
 852                 SSL2_SSL_SESSION_ID_LENGTH-s->init_num);
 853         if (i < (SSL2_SSL_SESSION_ID_LENGTH-s->init_num))
 854                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 855
 856         if (!s->hit) /* new session */
 857                 {
 858                 /* new session-id */
 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->ctx->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(s, type, len, data)
 880 SSL *s;
 881 int type;
 882 int len;
 883 unsigned char *data;
 884         {
 885         STACK *sk=NULL;
 886         EVP_PKEY *pkey=NULL;
 887         CERT *c=NULL;
 888         int i;
 889         X509 *x509=NULL;
 890         int ret=0;
 891
 892         x509=d2i_X509(NULL,&data,(long)len);
 893         if (x509 == NULL)
 894                 {
 895                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
 896                 goto err;
 897                 }
 898
 899         if (((sk=sk_new_null()) == NULL) ||
 900                 (!sk_push(sk,(char *)x509)))
 901                 {
 902                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 903                 goto err;
 904                 }
 905
 906         i=ssl_verify_cert_chain(s,sk);
 907
 908         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 909                 {
 910                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 911                 goto err;
 912                 }
 913
 914         /* cert for ssl */
 915         c=ssl_cert_new();
 916         if (c == NULL)
 917                 {
 918                 ret= -1;
 919                 goto err;
 920                 }
 921
 922         /* cert for session */
 923         if (s->session->cert) ssl_cert_free(s->session->cert);
 924         s->session->cert=c;
 925
 926 /*      c->cert_type=type; */
 927
 928         c->pkeys[SSL_PKEY_RSA_ENC].x509=x509;
 929         c->key= &(c->pkeys[SSL_PKEY_RSA_ENC]);
 930
 931         pkey=X509_get_pubkey(x509);
 932         x509=NULL;
 933         if (pkey == NULL)
 934                 {
 935                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
 936                 goto err;
 937                 }
 938         if (pkey->type != EVP_PKEY_RSA)
 939                 {
 940                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
 941                 goto err;
 942                 }
 943
 944         if (!ssl_set_cert_type(c,SSL2_CT_X509_CERTIFICATE))
 945                 goto err;
 946         ret=1;
 947 err:
 948         if (sk != NULL) sk_free(sk);
 949         if (x509 != NULL) X509_free(x509);
 950         return(ret);
 951         }
 952
 953 static int ssl_rsa_public_encrypt(c, len, from, to, padding)
 954 CERT *c;
 955 int len;
 956 unsigned char *from;
 957 unsigned char *to;
 958 int padding;
 959         {
 960         EVP_PKEY *pkey=NULL;
 961         int i= -1;
 962
 963         if ((c == NULL) || (c->key->x509 == NULL) ||
 964                 ((pkey=X509_get_pubkey(c->key->x509)) == NULL))
 965                 {
 966                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
 967                 return(-1);
 968                 }
 969         if (pkey->type != EVP_PKEY_RSA)
 970                 {
 971                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 972                 goto end;
 973                 }
 974
 975         /* we have the public key */
 976         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
 977         if (i < 0)
 978                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
 979 end:
 980         return(i);
 981         }
 982