ssl/s2_clnt.c

   1 /* ssl/s2_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "rand.h"
  61 #include "buffer.h"
  62 #include "objects.h"
  63 #include "ssl_locl.h"
  64 #include "evp.h"
  65
  66 #ifndef NOPROTO
  67 static SSL_METHOD *ssl2_get_client_method(int ver);
  68 static int get_server_finished(SSL *s);
  69 static int get_server_verify(SSL *s);
  70 static int get_server_hello(SSL *s);
  71 static int client_hello(SSL *s);
  72 static int client_master_key(SSL *s);
  73 static int client_finished(SSL *s);
  74 static int client_certificate(SSL *s);
  75 static int ssl_rsa_public_encrypt(CERT *c, int len, unsigned char *from,
  76         unsigned char *to,int padding);
  77 #else
  78 static SSL_METHOD *ssl2_get_client_method();
  79 static int get_server_finished();
  80 static int get_server_verify();
  81 static int get_server_hello();
  82 static int client_hello();
  83 static int client_master_key();
  84 static int client_finished();
  85 static int client_certificate();
  86 static int ssl_rsa_public_encrypt();
  87 #endif
  88
  89 #define BREAK   break
  90
  91 static SSL_METHOD *ssl2_get_client_method(int ver)
  92         {
  93         if (ver == SSL2_VERSION)
  94                 return(SSLv2_client_method());
  95         else
  96                 return(NULL);
  97         }
  98
  99 SSL_METHOD *SSLv2_client_method(void)
 100         {
 101         static int init=1;
 102         static SSL_METHOD SSLv2_client_data;
 103
 104         if (init)
 105                 {
 106                 init=0;
 107                 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
 108                         sizeof(SSL_METHOD));
 109                 SSLv2_client_data.ssl_connect=ssl2_connect;
 110                 SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
 111                 }
 112         return(&SSLv2_client_data);
 113         }
 114
 115 int ssl2_connect(SSL *s)
 116         {
 117         unsigned long l=time(NULL);
 118         BUF_MEM *buf=NULL;
 119         int ret= -1;
 120         void (*cb)()=NULL;
 121         int new_state,state;
 122
 123         RAND_seed(&l,sizeof(l));
 124         ERR_clear_error();
 125         clear_sys_error();
 126
 127         if (s->info_callback != NULL)
 128                 cb=s->info_callback;
 129         else if (s->ctx->info_callback != NULL)
 130                 cb=s->ctx->info_callback;
 131
 132         /* init things to blank */
 133         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 134         s->in_handshake++;
 135
 136         for (;;)
 137                 {
 138                 state=s->state;
 139
 140                 switch (s->state)
 141                         {
 142                 case SSL_ST_BEFORE:
 143                 case SSL_ST_CONNECT:
 144                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 145                 case SSL_ST_OK|SSL_ST_CONNECT:
 146
 147                         s->server=0;
 148                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 149
 150                         s->version=SSL2_VERSION;
 151                         s->type=SSL_ST_CONNECT;
 152
 153                         buf=s->init_buf;
 154                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 155                                 {
 156                                 ret= -1;
 157                                 goto end;
 158                                 }
 159                         if (!BUF_MEM_grow(buf,
 160                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 161                                 {
 162                                 ret= -1;
 163                                 goto end;
 164                                 }
 165                         s->init_buf=buf;
 166                         s->init_num=0;
 167                         s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
 168                         s->ctx->stats.sess_connect++;
 169                         s->handshake_func=ssl2_connect;
 170                         BREAK;
 171
 172                 case SSL2_ST_SEND_CLIENT_HELLO_A:
 173                 case SSL2_ST_SEND_CLIENT_HELLO_B:
 174                         s->shutdown=0;
 175                         ret=client_hello(s);
 176                         if (ret <= 0) goto end;
 177                         s->init_num=0;
 178                         s->state=SSL2_ST_GET_SERVER_HELLO_A;
 179                         BREAK;
 180
 181                 case SSL2_ST_GET_SERVER_HELLO_A:
 182                 case SSL2_ST_GET_SERVER_HELLO_B:
 183                         ret=get_server_hello(s);
 184                         if (ret <= 0) goto end;
 185                         s->init_num=0;
 186                         if (!s->hit) /* new session */
 187                                 {
 188                                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
 189                                 BREAK;
 190                                 }
 191                         else
 192                                 {
 193                                 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 194                                 break;
 195                                 }
 196
 197                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
 198                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
 199                         ret=client_master_key(s);
 200                         if (ret <= 0) goto end;
 201                         s->init_num=0;
 202                         s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 203                         break;
 204
 205                 case SSL2_ST_CLIENT_START_ENCRYPTION:
 206                         /* Ok, we now have all the stuff needed to
 207                          * start encrypting, so lets fire it up :-) */
 208                         if (!ssl2_enc_init(s,1))
 209                                 {
 210                                 ret= -1;
 211                                 goto end;
 212                                 }
 213                         s->s2->clear_text=0;
 214                         s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
 215                         break;
 216
 217                 case SSL2_ST_SEND_CLIENT_FINISHED_A:
 218                 case SSL2_ST_SEND_CLIENT_FINISHED_B:
 219                         ret=client_finished(s);
 220                         if (ret <= 0) goto end;
 221                         s->init_num=0;
 222                         s->state=SSL2_ST_GET_SERVER_VERIFY_A;
 223                         break;
 224
 225                 case SSL2_ST_GET_SERVER_VERIFY_A:
 226                 case SSL2_ST_GET_SERVER_VERIFY_B:
 227                         ret=get_server_verify(s);
 228                         if (ret <= 0) goto end;
 229                         s->init_num=0;
 230                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 231                         break;
 232
 233                 case SSL2_ST_GET_SERVER_FINISHED_A:
 234                 case SSL2_ST_GET_SERVER_FINISHED_B:
 235                         ret=get_server_finished(s);
 236                         if (ret <= 0) goto end;
 237                         break;
 238
 239                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
 240                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
 241                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
 242                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
 243                 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
 244                         ret=client_certificate(s);
 245                         if (ret <= 0) goto end;
 246                         s->init_num=0;
 247                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 248                         break;
 249
 250                 case SSL_ST_OK:
 251                         if (s->init_buf != NULL)
 252                                 {
 253                                 BUF_MEM_free(s->init_buf);
 254                                 s->init_buf=NULL;
 255                                 }
 256                         s->init_num=0;
 257                 /*      ERR_clear_error();*/
 258
 259                         /* If we want to cache session-ids in the client
 260                          * and we sucessfully add the session-id to the
 261                          * cache, and there is a callback, then pass it out.
 262                          * 26/11/96 - eay - only add if not a re-used session.
 263                          */
 264
 265                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 266                         if (s->hit) s->ctx->stats.sess_hit++;
 267
 268                         ret=1;
 269                         /* s->server=0; */
 270                         s->ctx->stats.sess_connect_good++;
 271
 272                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 273
 274                         goto end;
 275                         /* break; */
 276                 default:
 277                         SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
 278                         return(-1);
 279                         /* break; */
 280                         }
 281
 282                 if ((cb != NULL) && (s->state != state))
 283                         {
 284                         new_state=s->state;
 285                         s->state=state;
 286                         cb(s,SSL_CB_CONNECT_LOOP,1);
 287                         s->state=new_state;
 288                         }
 289                 }
 290 end:
 291         s->in_handshake--;
 292         if (cb != NULL)
 293                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 294         return(ret);
 295         }
 296
 297 static int get_server_hello(SSL *s)
 298         {
 299         unsigned char *buf;
 300         unsigned char *p;
 301         int i,j;
 302         STACK_OF(SSL_CIPHER) *sk=NULL,*cl;
 303
 304         buf=(unsigned char *)s->init_buf->data;
 305         p=buf;
 306         if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
 307                 {
 308                 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
 309                 if (i < (11-s->init_num))
 310                         return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 311
 312                 if (*(p++) != SSL2_MT_SERVER_HELLO)
 313                         {
 314                         if (p[-1] != SSL2_MT_ERROR)
 315                                 {
 316                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 317                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 318                                         SSL_R_READ_WRONG_PACKET_TYPE);
 319                                 }
 320                         else
 321                                 SSLerr(SSL_F_GET_SERVER_HELLO,
 322                                         SSL_R_PEER_ERROR);
 323                         return(-1);
 324                         }
 325                 s->hit=(*(p++))?1:0;
 326                 s->s2->tmp.cert_type= *(p++);
 327                 n2s(p,i);
 328                 if (i < s->version) s->version=i;
 329                 n2s(p,i); s->s2->tmp.cert_length=i;
 330                 n2s(p,i); s->s2->tmp.csl=i;
 331                 n2s(p,i); s->s2->tmp.conn_id_length=i;
 332                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
 333                 s->init_num=0;
 334                 }
 335
 336         /* SSL2_ST_GET_SERVER_HELLO_B */
 337         j=s->s2->tmp.cert_length+s->s2->tmp.csl+s->s2->tmp.conn_id_length
 338                 - s->init_num;
 339         i=ssl2_read(s,(char *)&(buf[s->init_num]),j);
 340         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
 341
 342         /* things are looking good */
 343
 344         p=buf;
 345         if (s->hit)
 346                 {
 347                 if (s->s2->tmp.cert_length != 0)
 348                         {
 349                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
 350                         return(-1);
 351                         }
 352                 if (s->s2->tmp.cert_type != 0)
 353                         {
 354                         if (!(s->options &
 355                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
 356                                 {
 357                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
 358                                 return(-1);
 359                                 }
 360                         }
 361                 if (s->s2->tmp.csl != 0)
 362                         {
 363                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
 364                         return(-1);
 365                         }
 366                 }
 367         else
 368                 {
 369 #ifdef undef
 370                 /* very bad */
 371                 memset(s->session->session_id,0,
 372                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
 373                 s->session->session_id_length=0;
 374                 */
 375 #endif
 376
 377                 /* we need to do this incase we were trying to reuse a
 378                  * client session but others are already reusing it.
 379                  * If this was a new 'blank' session ID, the session-id
 380                  * length will still be 0 */
 381                 if (s->session->session_id_length > 0)
 382                         {
 383                         if (!ssl_get_new_session(s,0))
 384                                 {
 385                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 386                                 return(-1);
 387                                 }
 388                         }
 389
 390                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
 391                         s->s2->tmp.cert_length,p) <= 0)
 392                         {
 393                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 394                         return(-1);
 395                         }
 396                 p+=s->s2->tmp.cert_length;
 397
 398                 if (s->s2->tmp.csl == 0)
 399                         {
 400                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 401                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
 402                         return(-1);
 403                         }
 404
 405                 /* We have just received a list of ciphers back from the
 406                  * server.  We need to get the ones that match, then select
 407                  * the one we want the most :-). */
 408
 409                 /* load the ciphers */
 410                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
 411                                             &s->session->ciphers);
 412                 p+=s->s2->tmp.csl;
 413                 if (sk == NULL)
 414                         {
 415                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 416                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
 417                         return(-1);
 418                         }
 419
 420                 sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
 421
 422                 /* get the array of ciphers we will accept */
 423                 cl=ssl_get_ciphers_by_id(s);
 424
 425                 /* In theory we could have ciphers sent back that we
 426                  * don't want to use but that does not matter since we
 427                  * will check against the list we origionally sent and
 428                  * for performance reasons we should not bother to match
 429                  * the two lists up just to check. */
 430                 for (i=0; i<sk_SSL_CIPHER_num(cl); i++)
 431                         {
 432                         if (sk_SSL_CIPHER_find(sk,
 433                                                sk_SSL_CIPHER_value(cl,i)) >= 0)
 434                                 break;
 435                         }
 436
 437                 if (i >= sk_SSL_CIPHER_num(cl))
 438                         {
 439                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 440                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
 441                         return(-1);
 442                         }
 443                 s->session->cipher=sk_SSL_CIPHER_value(cl,i);
 444                 }
 445
 446         if ((s->session != NULL) && (s->session->peer != NULL))
 447                 X509_free(s->session->peer);
 448
 449         /* hmmm, can we have the problem of the other session with this
 450          * cert, Free's it before we increment the reference count. */
 451         CRYPTO_w_lock(CRYPTO_LOCK_X509);
 452         s->session->peer=s->session->cert->key->x509;
 453         CRYPTO_add(&s->session->peer->references,1,CRYPTO_LOCK_X509);
 454         CRYPTO_w_unlock(CRYPTO_LOCK_X509);
 455
 456         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
 457         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
 458         return(1);
 459         }
 460
 461 static int client_hello(SSL *s)
 462         {
 463         unsigned char *buf;
 464         unsigned char *p,*d;
 465 /*      CIPHER **cipher;*/
 466         int i,n,j;
 467
 468         buf=(unsigned char *)s->init_buf->data;
 469         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
 470                 {
 471                 if ((s->session == NULL) ||
 472                         (s->session->ssl_version != s->version))
 473                         {
 474                         if (!ssl_get_new_session(s,0))
 475                                 {
 476                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 477                                 return(-1);
 478                                 }
 479                         }
 480                 /* else use the pre-loaded session */
 481
 482                 p=buf;                                  /* header */
 483                 d=p+9;                                  /* data section */
 484                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
 485                 s2n(SSL2_VERSION,p);                    /* version */
 486                 n=j=0;
 487
 488                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d);
 489                 d+=n;
 490
 491                 if (n == 0)
 492                         {
 493                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 494                         return(-1);
 495                         }
 496
 497                 s2n(n,p);                       /* cipher spec num bytes */
 498
 499                 if ((s->session->session_id_length > 0) &&
 500                         (s->session->session_id_length <=
 501                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
 502                         {
 503                         i=s->session->session_id_length;
 504                         s2n(i,p);               /* session id length */
 505                         memcpy(d,s->session->session_id,(unsigned int)i);
 506                         d+=i;
 507                         }
 508                 else
 509                         {
 510                         s2n(0,p);
 511                         }
 512
 513                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
 514                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
 515                 /*challenge id data*/
 516                 RAND_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 517                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
 518                 d+=SSL2_CHALLENGE_LENGTH;
 519
 520                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
 521                 s->init_num=d-buf;
 522                 s->init_off=0;
 523                 }
 524         /* SSL2_ST_SEND_CLIENT_HELLO_B */
 525         return(ssl2_do_write(s));
 526         }
 527
 528 static int client_master_key(SSL *s)
 529         {
 530         unsigned char *buf;
 531         unsigned char *p,*d;
 532         int clear,enc,karg,i;
 533         SSL_SESSION *sess;
 534         const EVP_CIPHER *c;
 535         const 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,&c,&md,NULL))
 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 (SSL_C_IS_EXPORT(sess->cipher))
 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 #ifdef PKCS1_CHECK
 593                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
 594                 if (s->options & SSL_OP_PKCS1_CHECK_2)
 595                         sess->master_key[clear]++;
 596 #endif
 597                 s2n(enc,p);
 598                 d+=enc;
 599                 karg=sess->key_arg_length;
 600                 s2n(karg,p); /* key arg size */
 601                 memcpy(d,sess->key_arg,(unsigned int)karg);
 602                 d+=karg;
 603
 604                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
 605                 s->init_num=d-buf;
 606                 s->init_off=0;
 607                 }
 608
 609         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
 610         return(ssl2_do_write(s));
 611         }
 612
 613 static int client_finished(SSL *s)
 614         {
 615         unsigned char *p;
 616
 617         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
 618                 {
 619                 p=(unsigned char *)s->init_buf->data;
 620                 *(p++)=SSL2_MT_CLIENT_FINISHED;
 621                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
 622
 623                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
 624                 s->init_num=s->s2->conn_id_length+1;
 625                 s->init_off=0;
 626                 }
 627         return(ssl2_do_write(s));
 628         }
 629
 630 /* read the data and then respond */
 631 static int client_certificate(SSL *s)
 632         {
 633         unsigned char *buf;
 634         unsigned char *p,*d;
 635         int i;
 636         unsigned int n;
 637         int cert_ch_len=0;
 638         unsigned char *cert_ch;
 639
 640         buf=(unsigned char *)s->init_buf->data;
 641         cert_ch= &(buf[2]);
 642
 643         /* We have a cert associated with the SSL, so attach it to
 644          * the session if it does not have one */
 645
 646         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
 647                 {
 648                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
 649                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
 650                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
 651                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
 652
 653                 /* type=buf[0]; */
 654                 /* type eq x509 */
 655                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 656                         {
 657                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 658                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
 659                         return(-1);
 660                         }
 661                 cert_ch_len=i-1;
 662
 663                 if ((s->cert == NULL) ||
 664                         (s->cert->key->x509 == NULL) ||
 665                         (s->cert->key->privatekey == NULL))
 666                         {
 667                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
 668                         }
 669                 else
 670                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 671                 }
 672
 673         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
 674                 {
 675                 X509 *x509=NULL;
 676                 EVP_PKEY *pkey=NULL;
 677
 678                 /* If we get an error we need to
 679                  * ssl->rwstate=SSL_X509_LOOKUP;
 680                  * return(error);
 681                  * We should then be retried when things are ok and we
 682                  * can get a cert or not */
 683
 684                 i=0;
 685                 if (s->ctx->client_cert_cb != NULL)
 686                         {
 687                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
 688                         }
 689
 690                 if (i < 0)
 691                         {
 692                         s->rwstate=SSL_X509_LOOKUP;
 693                         return(-1);
 694                         }
 695                 s->rwstate=SSL_NOTHING;
 696
 697                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
 698                         {
 699                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 700                         if (    !SSL_use_certificate(s,x509) ||
 701                                 !SSL_use_PrivateKey(s,pkey))
 702                                 {
 703                                 i=0;
 704                                 }
 705                         X509_free(x509);
 706                         EVP_PKEY_free(pkey);
 707                         }
 708                 else if (i == 1)
 709                         {
 710                         if (x509 != NULL) X509_free(x509);
 711                         if (pkey != NULL) EVP_PKEY_free(pkey);
 712                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
 713                         i=0;
 714                         }
 715
 716                 if (i == 0)
 717                         {
 718                         /* We have no client certificate to respond with
 719                          * so send the correct error message back */
 720                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
 721                         p=buf;
 722                         *(p++)=SSL2_MT_ERROR;
 723                         s2n(SSL2_PE_NO_CERTIFICATE,p);
 724                         s->init_off=0;
 725                         s->init_num=3;
 726                         /* Write is done at the end */
 727                         }
 728                 }
 729
 730         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
 731                 {
 732                 return(ssl2_do_write(s));
 733                 }
 734
 735         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
 736                 {
 737                 EVP_MD_CTX ctx;
 738
 739                 /* ok, now we calculate the checksum
 740                  * do it first so we can reuse buf :-) */
 741                 p=buf;
 742                 EVP_SignInit(&ctx,s->ctx->rsa_md5);
 743                 EVP_SignUpdate(&ctx,s->s2->key_material,
 744                         (unsigned int)s->s2->key_material_length);
 745                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
 746                 n=i2d_X509(s->session->cert->key->x509,&p);
 747                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
 748
 749                 p=buf;
 750                 d=p+6;
 751                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
 752                 *(p++)=SSL2_CT_X509_CERTIFICATE;
 753                 n=i2d_X509(s->cert->key->x509,&d);
 754                 s2n(n,p);
 755
 756                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
 757                         {
 758                         /* this is not good.  If things have failed it
 759                          * means there so something wrong with the key.
 760                          * We will contiune with a 0 length signature
 761                          */
 762                         }
 763                 memset(&ctx,0,sizeof(ctx));
 764                 s2n(n,p);
 765                 d+=n;
 766
 767                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
 768                 s->init_num=d-buf;
 769                 s->init_off=0;
 770                 }
 771         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
 772         return(ssl2_do_write(s));
 773         }
 774
 775 static int get_server_verify(SSL *s)
 776         {
 777         unsigned char *p;
 778         int i;
 779
 780         p=(unsigned char *)s->init_buf->data;
 781         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
 782                 {
 783                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 784                 if (i < (1-s->init_num))
 785                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 786
 787                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
 788                 s->init_num=0;
 789                 if (*p != SSL2_MT_SERVER_VERIFY)
 790                         {
 791                         if (p[0] != SSL2_MT_ERROR)
 792                                 {
 793                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 794                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 795                                         SSL_R_READ_WRONG_PACKET_TYPE);
 796                                 }
 797                         else
 798                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 799                                         SSL_R_PEER_ERROR);
 800                         return(-1);
 801                         }
 802                 }
 803
 804         p=(unsigned char *)s->init_buf->data;
 805         i=ssl2_read(s,(char *)&(p[s->init_num]),
 806                 (unsigned int)s->s2->challenge_length-s->init_num);
 807         if (i < ((int)s->s2->challenge_length-s->init_num))
 808                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 809         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
 810                 {
 811                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 812                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
 813                 return(-1);
 814                 }
 815         return(1);
 816         }
 817
 818 static int get_server_finished(SSL *s)
 819         {
 820         unsigned char *buf;
 821         unsigned char *p;
 822         int i;
 823
 824         buf=(unsigned char *)s->init_buf->data;
 825         p=buf;
 826         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
 827                 {
 828                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
 829                 if (i < (1-s->init_num))
 830                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 831                 s->init_num=i;
 832                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
 833                         {
 834                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
 835                         return(1);
 836                         }
 837                 else if (*p != SSL2_MT_SERVER_FINISHED)
 838                         {
 839                         if (p[0] != SSL2_MT_ERROR)
 840                                 {
 841                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 842                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 843                                 }
 844                         else
 845                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
 846                         return(-1);
 847                         }
 848                 s->state=SSL_ST_OK;
 849                 s->init_num=0;
 850                 }
 851
 852         i=ssl2_read(s,(char *)&(buf[s->init_num]),
 853                 SSL2_SSL_SESSION_ID_LENGTH-s->init_num);
 854         if (i < (SSL2_SSL_SESSION_ID_LENGTH-s->init_num))
 855                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 856
 857         if (!s->hit) /* new session */
 858                 {
 859                 /* new session-id */
 860                 /* Make sure we were not trying to re-use an old SSL_SESSION
 861                  * or bad things can happen */
 862                 /* ZZZZZZZZZZZZZ */
 863                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
 864                 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH);
 865                 }
 866         else
 867                 {
 868                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
 869                         {
 870                         if (memcmp(buf,s->session->session_id,
 871                                 (unsigned int)s->session->session_id_length) != 0)
 872                                 {
 873                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 874                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
 875                                 return(-1);
 876                                 }
 877                         }
 878                 }
 879         return(1);
 880         }
 881
 882 /* loads in the certificate from the server */
 883 int ssl2_set_certificate(SSL *s, int type, int len, unsigned char *data)
 884         {
 885         STACK_OF(X509) *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_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
 900                 {
 901                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 902                 goto err;
 903                 }
 904
 905         i=ssl_verify_cert_chain(s,sk);
 906
 907         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 908                 {
 909                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 910                 goto err;
 911                 }
 912
 913         /* cert for ssl */
 914         c=ssl_cert_new();
 915         if (c == NULL)
 916                 {
 917                 ret= -1;
 918                 goto err;
 919                 }
 920
 921         /* cert for session */
 922         if (s->session->cert) ssl_cert_free(s->session->cert);
 923         s->session->cert=c;
 924
 925 /*      c->cert_type=type; */
 926
 927         c->pkeys[SSL_PKEY_RSA_ENC].x509=x509;
 928         c->key= &(c->pkeys[SSL_PKEY_RSA_ENC]);
 929
 930         pkey=X509_get_pubkey(x509);
 931         x509=NULL;
 932         if (pkey == NULL)
 933                 {
 934                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
 935                 goto err;
 936                 }
 937         if (pkey->type != EVP_PKEY_RSA)
 938                 {
 939                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
 940                 goto err;
 941                 }
 942
 943         if (!ssl_set_cert_type(c,SSL2_CT_X509_CERTIFICATE))
 944                 goto err;
 945         ret=1;
 946 err:
 947         sk_X509_free(sk);
 948         X509_free(x509);
 949         EVP_PKEY_free(pkey);
 950         return(ret);
 951         }
 952
 953 static int ssl_rsa_public_encrypt(CERT *c, int len, unsigned char *from,
 954              unsigned char *to, int padding)
 955         {
 956         EVP_PKEY *pkey=NULL;
 957         int i= -1;
 958
 959         if ((c == NULL) || (c->key->x509 == NULL) ||
 960                 ((pkey=X509_get_pubkey(c->key->x509)) == NULL))
 961                 {
 962                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
 963                 return(-1);
 964                 }
 965         if (pkey->type != EVP_PKEY_RSA)
 966                 {
 967                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 968                 goto end;
 969                 }
 970
 971         /* we have the public key */
 972         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
 973         if (i < 0)
 974                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
 975 end:
 976         EVP_PKEY_free(pkey);
 977         return(i);
 978         }
 979