ssl/s2_clnt.c

   1 /* ssl/s2_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "rand.h"
  61 #include "buffer.h"
  62 #include "objects.h"
  63 #include "ssl_locl.h"
  64 #include "evp.h"
  65
  66 #ifndef NOPROTO
  67 static SSL_METHOD *ssl2_get_client_method(int ver);
  68 static int get_server_finished(SSL *s);
  69 static int get_server_verify(SSL *s);
  70 static int get_server_hello(SSL *s);
  71 static int client_hello(SSL *s);
  72 static int client_master_key(SSL *s);
  73 static int client_finished(SSL *s);
  74 static int client_certificate(SSL *s);
  75 static int ssl_rsa_public_encrypt(CERT *c, int len, unsigned char *from,
  76         unsigned char *to,int padding);
  77 #else
  78 static SSL_METHOD *ssl2_get_client_method();
  79 static int get_server_finished();
  80 static int get_server_verify();
  81 static int get_server_hello();
  82 static int client_hello();
  83 static int client_master_key();
  84 static int client_finished();
  85 static int client_certificate();
  86 static int ssl_rsa_public_encrypt();
  87 #endif
  88
  89 #define BREAK   break
  90
  91 static SSL_METHOD *ssl2_get_client_method(ver)
  92 int ver;
  93         {
  94         if (ver == SSL2_VERSION)
  95                 return(SSLv2_client_method());
  96         else
  97                 return(NULL);
  98         }
  99
 100 SSL_METHOD *SSLv2_client_method()
 101         {
 102         static int init=1;
 103         static SSL_METHOD SSLv2_client_data;
 104
 105         if (init)
 106                 {
 107                 init=0;
 108                 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
 109                         sizeof(SSL_METHOD));
 110                 SSLv2_client_data.ssl_connect=ssl2_connect;
 111                 SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
 112                 }
 113         return(&SSLv2_client_data);
 114         }
 115
 116 int ssl2_connect(s)
 117 SSL *s;
 118         {
 119         unsigned long l=time(NULL);
 120         BUF_MEM *buf=NULL;
 121         int ret= -1;
 122         void (*cb)()=NULL;
 123         int new_state,state;
 124
 125         RAND_seed((unsigned char *)&l,sizeof(l));
 126         ERR_clear_error();
 127         clear_sys_error();
 128
 129         if (s->info_callback != NULL)
 130                 cb=s->info_callback;
 131         else if (s->ctx->info_callback != NULL)
 132                 cb=s->ctx->info_callback;
 133
 134         /* init things to blank */
 135         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 136         s->in_handshake++;
 137
 138         for (;;)
 139                 {
 140                 state=s->state;
 141
 142                 switch (s->state)
 143                         {
 144                 case SSL_ST_BEFORE:
 145                 case SSL_ST_CONNECT:
 146                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 147                 case SSL_ST_OK|SSL_ST_CONNECT:
 148
 149                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 150
 151                         s->version=SSL2_VERSION;
 152                         s->type=SSL_ST_CONNECT;
 153
 154                         buf=s->init_buf;
 155                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 156                                 {
 157                                 ret= -1;
 158                                 goto end;
 159                                 }
 160                         if (!BUF_MEM_grow(buf,
 161                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 162                                 {
 163                                 ret= -1;
 164                                 goto end;
 165                                 }
 166                         s->init_buf=buf;
 167                         s->init_num=0;
 168                         s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
 169                         s->ctx->sess_connect++;
 170                         s->handshake_func=ssl2_connect;
 171                         BREAK;
 172
 173                 case SSL2_ST_SEND_CLIENT_HELLO_A:
 174                 case SSL2_ST_SEND_CLIENT_HELLO_B:
 175                         s->shutdown=0;
 176                         ret=client_hello(s);
 177                         if (ret <= 0) goto end;
 178                         s->init_num=0;
 179                         s->state=SSL2_ST_GET_SERVER_HELLO_A;
 180                         BREAK;
 181
 182                 case SSL2_ST_GET_SERVER_HELLO_A:
 183                 case SSL2_ST_GET_SERVER_HELLO_B:
 184                         ret=get_server_hello(s);
 185                         if (ret <= 0) goto end;
 186                         s->init_num=0;
 187                         if (!s->hit) /* new session */
 188                                 {
 189                                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
 190                                 BREAK;
 191                                 }
 192                         else
 193                                 {
 194                                 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 195                                 break;
 196                                 }
 197
 198                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
 199                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
 200                         ret=client_master_key(s);
 201                         if (ret <= 0) goto end;
 202                         s->init_num=0;
 203                         s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
 204                         break;
 205
 206                 case SSL2_ST_CLIENT_START_ENCRYPTION:
 207                         /* Ok, we now have all the stuff needed to
 208                          * start encrypting, so lets fire it up :-) */
 209                         if (!ssl2_enc_init(s,1))
 210                                 {
 211                                 ret= -1;
 212                                 goto end;
 213                                 }
 214                         s->s2->clear_text=0;
 215                         s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
 216                         break;
 217
 218                 case SSL2_ST_SEND_CLIENT_FINISHED_A:
 219                 case SSL2_ST_SEND_CLIENT_FINISHED_B:
 220                         ret=client_finished(s);
 221                         if (ret <= 0) goto end;
 222                         s->init_num=0;
 223                         s->state=SSL2_ST_GET_SERVER_VERIFY_A;
 224                         break;
 225
 226                 case SSL2_ST_GET_SERVER_VERIFY_A:
 227                 case SSL2_ST_GET_SERVER_VERIFY_B:
 228                         ret=get_server_verify(s);
 229                         if (ret <= 0) goto end;
 230                         s->init_num=0;
 231                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 232                         break;
 233
 234                 case SSL2_ST_GET_SERVER_FINISHED_A:
 235                 case SSL2_ST_GET_SERVER_FINISHED_B:
 236                         ret=get_server_finished(s);
 237                         if (ret <= 0) goto end;
 238                         break;
 239
 240                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
 241                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
 242                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
 243                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
 244                 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
 245                         ret=client_certificate(s);
 246                         if (ret <= 0) goto end;
 247                         s->init_num=0;
 248                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
 249                         break;
 250
 251                 case SSL_ST_OK:
 252                         BUF_MEM_free(s->init_buf);
 253                         s->init_buf=NULL;
 254                         s->init_num=0;
 255                 /*      ERR_clear_error();*/
 256
 257                         /* If we want to cache session-ids in the client
 258                          * and we sucessfully add the session-id to the
 259                          * cache, and there is a callback, then pass it out.
 260                          * 26/11/96 - eay - only add if not a re-used session.
 261                          */
 262
 263                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 264                         if (s->hit) s->ctx->sess_hit++;
 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=NULL,*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->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         CRYPTO_add(&s->session->peer->references,1,CRYPTO_LOCK_X509);
 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 #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(s)
 614 SSL *s;
 615         {
 616         unsigned char *p;
 617
 618         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
 619                 {
 620                 p=(unsigned char *)s->init_buf->data;
 621                 *(p++)=SSL2_MT_CLIENT_FINISHED;
 622                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
 623
 624                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
 625                 s->init_num=s->s2->conn_id_length+1;
 626                 s->init_off=0;
 627                 }
 628         return(ssl2_do_write(s));
 629         }
 630
 631 /* read the data and then respond */
 632 static int client_certificate(s)
 633 SSL *s;
 634         {
 635         unsigned char *buf;
 636         unsigned char *p,*d;
 637         int i;
 638         unsigned int n;
 639         int cert_ch_len=0;
 640         unsigned char *cert_ch;
 641
 642         buf=(unsigned char *)s->init_buf->data;
 643         cert_ch= &(buf[2]);
 644
 645         /* We have a cert associated with the SSL, so attach it to
 646          * the session if it does not have one */
 647
 648         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
 649                 {
 650                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
 651                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
 652                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
 653                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
 654
 655                 /* type=buf[0]; */
 656                 /* type eq x509 */
 657                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 658                         {
 659                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 660                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
 661                         return(-1);
 662                         }
 663                 cert_ch_len=i-1;
 664
 665                 if ((s->cert == NULL) ||
 666                         (s->cert->key->x509 == NULL) ||
 667                         (s->cert->key->privatekey == NULL))
 668                         {
 669                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
 670                         }
 671                 else
 672                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 673                 }
 674
 675         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
 676                 {
 677                 X509 *x509=NULL;
 678                 EVP_PKEY *pkey=NULL;
 679
 680                 /* If we get an error we need to
 681                  * ssl->rwstate=SSL_X509_LOOKUP;
 682                  * return(error);
 683                  * We should then be retried when things are ok and we
 684                  * can get a cert or not */
 685
 686                 i=0;
 687                 if (s->ctx->client_cert_cb != NULL)
 688                         {
 689                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
 690                         }
 691
 692                 if (i < 0)
 693                         {
 694                         s->rwstate=SSL_X509_LOOKUP;
 695                         return(-1);
 696                         }
 697                 s->rwstate=SSL_NOTHING;
 698
 699                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
 700                         {
 701                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
 702                         if (    !SSL_use_certificate(s,x509) ||
 703                                 !SSL_use_PrivateKey(s,pkey))
 704                                 {
 705                                 i=0;
 706                                 }
 707                         X509_free(x509);
 708                         EVP_PKEY_free(pkey);
 709                         }
 710                 else if (i == 1)
 711                         {
 712                         if (x509 != NULL) X509_free(x509);
 713                         if (pkey != NULL) EVP_PKEY_free(pkey);
 714                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
 715                         i=0;
 716                         }
 717
 718                 if (i == 0)
 719                         {
 720                         /* We have no client certificate to respond with
 721                          * so send the correct error message back */
 722                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
 723                         p=buf;
 724                         *(p++)=SSL2_MT_ERROR;
 725                         s2n(SSL2_PE_NO_CERTIFICATE,p);
 726                         s->init_off=0;
 727                         s->init_num=3;
 728                         /* Write is done at the end */
 729                         }
 730                 }
 731
 732         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
 733                 {
 734                 return(ssl2_do_write(s));
 735                 }
 736
 737         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
 738                 {
 739                 EVP_MD_CTX ctx;
 740
 741                 /* ok, now we calculate the checksum
 742                  * do it first so we can reuse buf :-) */
 743                 p=buf;
 744                 EVP_SignInit(&ctx,s->ctx->rsa_md5);
 745                 EVP_SignUpdate(&ctx,s->s2->key_material,
 746                         (unsigned int)s->s2->key_material_length);
 747                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
 748                 n=i2d_X509(s->session->cert->key->x509,&p);
 749                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
 750
 751                 p=buf;
 752                 d=p+6;
 753                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
 754                 *(p++)=SSL2_CT_X509_CERTIFICATE;
 755                 n=i2d_X509(s->cert->key->x509,&d);
 756                 s2n(n,p);
 757
 758                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
 759                         {
 760                         /* this is not good.  If things have failed it
 761                          * means there so something wrong with the key.
 762                          * We will contiune with a 0 length signature
 763                          */
 764                         }
 765                 memset(&ctx,0,sizeof(ctx));
 766                 s2n(n,p);
 767                 d+=n;
 768
 769                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
 770                 s->init_num=d-buf;
 771                 s->init_off=0;
 772                 }
 773         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
 774         return(ssl2_do_write(s));
 775         }
 776
 777 static int get_server_verify(s)
 778 SSL *s;
 779         {
 780         unsigned char *p;
 781         int i;
 782
 783         p=(unsigned char *)s->init_buf->data;
 784         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
 785                 {
 786                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 787                 if (i < (1-s->init_num))
 788                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 789
 790                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
 791                 s->init_num=0;
 792                 if (*p != SSL2_MT_SERVER_VERIFY)
 793                         {
 794                         if (p[0] != SSL2_MT_ERROR)
 795                                 {
 796                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 797                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 798                                         SSL_R_READ_WRONG_PACKET_TYPE);
 799                                 }
 800                         else
 801                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
 802                                         SSL_R_PEER_ERROR);
 803                         return(-1);
 804                         }
 805                 }
 806
 807         p=(unsigned char *)s->init_buf->data;
 808         i=ssl2_read(s,(char *)&(p[s->init_num]),
 809                 (unsigned int)s->s2->challenge_length-s->init_num);
 810         if (i < ((int)s->s2->challenge_length-s->init_num))
 811                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
 812         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
 813                 {
 814                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 815                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
 816                 return(-1);
 817                 }
 818         return(1);
 819         }
 820
 821 static int get_server_finished(s)
 822 SSL *s;
 823         {
 824         unsigned char *buf;
 825         unsigned char *p;
 826         int i;
 827
 828         buf=(unsigned char *)s->init_buf->data;
 829         p=buf;
 830         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
 831                 {
 832                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
 833                 if (i < (1-s->init_num))
 834                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 835                 s->init_num=i;
 836                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
 837                         {
 838                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
 839                         return(1);
 840                         }
 841                 else if (*p != SSL2_MT_SERVER_FINISHED)
 842                         {
 843                         if (p[0] != SSL2_MT_ERROR)
 844                                 {
 845                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 846                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 847                                 }
 848                         else
 849                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
 850                         return(-1);
 851                         }
 852                 s->state=SSL_ST_OK;
 853                 s->init_num=0;
 854                 }
 855
 856         i=ssl2_read(s,(char *)&(buf[s->init_num]),
 857                 SSL2_SSL_SESSION_ID_LENGTH-s->init_num);
 858         if (i < (SSL2_SSL_SESSION_ID_LENGTH-s->init_num))
 859                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
 860
 861         if (!s->hit) /* new session */
 862                 {
 863                 /* new session-id */
 864                 /* Make sure we were not trying to re-use an old SSL_SESSION
 865                  * or bad things can happen */
 866                 /* ZZZZZZZZZZZZZ */
 867                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
 868                 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH);
 869                 }
 870         else
 871                 {
 872                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
 873                         {
 874                         if (memcmp(buf,s->session->session_id,
 875                                 (unsigned int)s->session->session_id_length) != 0)
 876                                 {
 877                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 878                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
 879                                 return(-1);
 880                                 }
 881                         }
 882                 }
 883         return(1);
 884         }
 885
 886 /* loads in the certificate from the server */
 887 int ssl2_set_certificate(s, type, len, data)
 888 SSL *s;
 889 int type;
 890 int len;
 891 unsigned char *data;
 892         {
 893         STACK *sk=NULL;
 894         EVP_PKEY *pkey=NULL;
 895         CERT *c=NULL;
 896         int i;
 897         X509 *x509=NULL;
 898         int ret=0;
 899
 900         x509=d2i_X509(NULL,&data,(long)len);
 901         if (x509 == NULL)
 902                 {
 903                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
 904                 goto err;
 905                 }
 906
 907         if (((sk=sk_new_null()) == NULL) ||
 908                 (!sk_push(sk,(char *)x509)))
 909                 {
 910                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 911                 goto err;
 912                 }
 913
 914         i=ssl_verify_cert_chain(s,sk);
 915
 916         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 917                 {
 918                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 919                 goto err;
 920                 }
 921
 922         /* cert for ssl */
 923         c=ssl_cert_new();
 924         if (c == NULL)
 925                 {
 926                 ret= -1;
 927                 goto err;
 928                 }
 929
 930         /* cert for session */
 931         if (s->session->cert) ssl_cert_free(s->session->cert);
 932         s->session->cert=c;
 933
 934 /*      c->cert_type=type; */
 935
 936         c->pkeys[SSL_PKEY_RSA_ENC].x509=x509;
 937         c->key= &(c->pkeys[SSL_PKEY_RSA_ENC]);
 938
 939         pkey=X509_get_pubkey(x509);
 940         x509=NULL;
 941         if (pkey == NULL)
 942                 {
 943                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
 944                 goto err;
 945                 }
 946         if (pkey->type != EVP_PKEY_RSA)
 947                 {
 948                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
 949                 goto err;
 950                 }
 951
 952         if (!ssl_set_cert_type(c,SSL2_CT_X509_CERTIFICATE))
 953                 goto err;
 954         ret=1;
 955 err:
 956         if (sk != NULL) sk_free(sk);
 957         if (x509 != NULL) X509_free(x509);
 958         return(ret);
 959         }
 960
 961 static int ssl_rsa_public_encrypt(c, len, from, to, padding)
 962 CERT *c;
 963 int len;
 964 unsigned char *from;
 965 unsigned char *to;
 966 int padding;
 967         {
 968         EVP_PKEY *pkey=NULL;
 969         int i= -1;
 970
 971         if ((c == NULL) || (c->key->x509 == NULL) ||
 972                 ((pkey=X509_get_pubkey(c->key->x509)) == NULL))
 973                 {
 974                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
 975                 return(-1);
 976                 }
 977         if (pkey->type != EVP_PKEY_RSA)
 978                 {
 979                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 980                 goto end;
 981                 }
 982
 983         /* we have the public key */
 984         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
 985         if (i < 0)
 986                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
 987 end:
 988         return(i);
 989         }
 990