ssl/s2_srvr.c

   1 /* ssl/s2_srvr.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 "bio.h"
  61 #include "rand.h"
  62 #include "objects.h"
  63 #include "ssl_locl.h"
  64 #include "evp.h"
  65
  66 #ifndef NOPROTO
  67 static int get_client_master_key(SSL *s);
  68 static int get_client_hello(SSL *s);
  69 static int server_hello(SSL *s);
  70 static int get_client_finished(SSL *s);
  71 static int server_verify(SSL *s);
  72 static int server_finish(SSL *s);
  73 static int request_certificate(SSL *s);
  74 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
  75         unsigned char *to,int padding);
  76 #else
  77 static int get_client_master_key();
  78 static int get_client_hello();
  79 static int server_hello();
  80 static int get_client_finished();
  81 static int server_verify();
  82 static int server_finish();
  83 static int request_certificate();
  84 static int ssl_rsa_private_decrypt();
  85 #endif
  86
  87 #define BREAK   break
  88
  89 static SSL_METHOD *ssl2_get_server_method(ver)
  90 int ver;
  91         {
  92         if (ver == SSL2_VERSION)
  93                 return(SSLv2_server_method());
  94         else
  95                 return(NULL);
  96         }
  97
  98 SSL_METHOD *SSLv2_server_method()
  99         {
 100         static int init=1;
 101         static SSL_METHOD SSLv2_server_data;
 102
 103         if (init)
 104                 {
 105                 init=0;
 106                 memcpy((char *)&SSLv2_server_data,(char *)sslv2_base_method(),
 107                         sizeof(SSL_METHOD));
 108                 SSLv2_server_data.ssl_accept=ssl2_accept;
 109                 SSLv2_server_data.get_ssl_method=ssl2_get_server_method;
 110                 }
 111         return(&SSLv2_server_data);
 112         }
 113
 114 int ssl2_accept(s)
 115 SSL *s;
 116         {
 117         unsigned long l=time(NULL);
 118         BUF_MEM *buf=NULL;
 119         int ret= -1;
 120         long num1;
 121         void (*cb)()=NULL;
 122         int new_state,state;
 123
 124         RAND_seed((unsigned char *)&l,sizeof(l));
 125         ERR_clear_error();
 126         clear_sys_error();
 127
 128         if (s->info_callback != NULL)
 129                 cb=s->info_callback;
 130         else if (s->ctx->info_callback != NULL)
 131                 cb=s->ctx->info_callback;
 132
 133         /* init things to blank */
 134         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 135         s->in_handshake++;
 136
 137         if (((s->session == NULL) || (s->session->cert == NULL)) &&
 138                 (s->cert == NULL))
 139                 {
 140                 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 141                 return(-1);
 142                 }
 143
 144         clear_sys_error();
 145         for (;;)
 146                 {
 147                 state=s->state;
 148
 149                 switch (s->state)
 150                         {
 151                 case SSL_ST_BEFORE:
 152                 case SSL_ST_ACCEPT:
 153                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 154                 case SSL_ST_OK|SSL_ST_ACCEPT:
 155
 156                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 157
 158                         s->version=SSL2_VERSION;
 159                         s->type=SSL_ST_ACCEPT;
 160
 161                         buf=s->init_buf;
 162                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 163                                 { ret= -1; goto end; }
 164                         if (!BUF_MEM_grow(buf,(int)
 165                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 166                                 { ret= -1; goto end; }
 167                         s->init_buf=buf;
 168                         s->init_num=0;
 169                         s->ctx->sess_accept++;
 170                         s->handshake_func=ssl2_accept;
 171                         s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 172                         BREAK;
 173
 174                 case SSL2_ST_GET_CLIENT_HELLO_A:
 175                 case SSL2_ST_GET_CLIENT_HELLO_B:
 176                 case SSL2_ST_GET_CLIENT_HELLO_C:
 177                         s->shutdown=0;
 178                         ret=get_client_hello(s);
 179                         if (ret <= 0) goto end;
 180                         s->init_num=0;
 181                         s->state=SSL2_ST_SEND_SERVER_HELLO_A;
 182                         BREAK;
 183
 184                 case SSL2_ST_SEND_SERVER_HELLO_A:
 185                 case SSL2_ST_SEND_SERVER_HELLO_B:
 186                         ret=server_hello(s);
 187                         if (ret <= 0) goto end;
 188                         s->init_num=0;
 189                         if (!s->hit)
 190                                 {
 191                                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
 192                                 BREAK;
 193                                 }
 194                         else
 195                                 {
 196                                 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 197                                 BREAK;
 198                                 }
 199                 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
 200                 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
 201                         ret=get_client_master_key(s);
 202                         if (ret <= 0) goto end;
 203                         s->init_num=0;
 204                         s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 205                         BREAK;
 206
 207                 case SSL2_ST_SERVER_START_ENCRYPTION:
 208                         /* Ok we how have sent all the stuff needed to
 209                          * start encrypting, the next packet back will
 210                          * be encrypted. */
 211                         if (!ssl2_enc_init(s,0))
 212                                 { ret= -1; goto end; }
 213                         s->s2->clear_text=0;
 214                         s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
 215                         BREAK;
 216
 217                 case SSL2_ST_SEND_SERVER_VERIFY_A:
 218                 case SSL2_ST_SEND_SERVER_VERIFY_B:
 219                         ret=server_verify(s);
 220                         if (ret <= 0) goto end;
 221                         s->init_num=0;
 222                         if (s->hit)
 223                                 {
 224                                 /* If we are in here, we have been
 225                                  * buffering the output, so we need to
 226                                  * flush it and remove buffering from
 227                                  * future traffic */
 228                                 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
 229                                 BREAK;
 230                                 }
 231                         else
 232                                 {
 233                                 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 234                                 break;
 235                                 }
 236
 237                 case SSL2_ST_SEND_SERVER_VERIFY_C:
 238                         /* get the number of bytes to write */
 239                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 240                         if (num1 != 0)
 241                                 {
 242                                 s->rwstate=SSL_WRITING;
 243                                 num1=BIO_flush(s->wbio);
 244                                 if (num1 <= 0) { ret= -1; goto end; }
 245                                 s->rwstate=SSL_NOTHING;
 246                                 }
 247
 248                         /* flushed and now remove buffering */
 249                         s->wbio=BIO_pop(s->wbio);
 250
 251                         s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 252                         BREAK;
 253
 254                 case SSL2_ST_GET_CLIENT_FINISHED_A:
 255                 case SSL2_ST_GET_CLIENT_FINISHED_B:
 256                         ret=get_client_finished(s);
 257                         if (ret <= 0)
 258                                 goto end;
 259                         s->init_num=0;
 260                         s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
 261                         BREAK;
 262
 263                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
 264                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
 265                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
 266                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
 267                         /* don't do a 'request certificate' if we
 268                          * don't want to, or we already have one, and
 269                          * we only want to do it once. */
 270                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 271                                 ((s->session->peer != NULL) &&
 272                                 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 273                                 {
 274                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 275                                 break;
 276                                 }
 277                         else
 278                                 {
 279                                 ret=request_certificate(s);
 280                                 if (ret <= 0) goto end;
 281                                 s->init_num=0;
 282                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 283                                 }
 284                         BREAK;
 285
 286                 case SSL2_ST_SEND_SERVER_FINISHED_A:
 287                 case SSL2_ST_SEND_SERVER_FINISHED_B:
 288                         ret=server_finish(s);
 289                         if (ret <= 0) goto end;
 290                         s->init_num=0;
 291                         s->state=SSL_ST_OK;
 292                         break;
 293
 294                 case SSL_ST_OK:
 295                         BUF_MEM_free(s->init_buf);
 296                         s->init_buf=NULL;
 297                         s->init_num=0;
 298                 /*      ERR_clear_error();*/
 299
 300                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 301
 302                         s->ctx->sess_accept_good++;
 303                         /* s->server=1; */
 304                         ret=1;
 305
 306                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 307
 308                         goto end;
 309                         /* BREAK; */
 310
 311                 default:
 312                         SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
 313                         ret= -1;
 314                         goto end;
 315                         /* BREAK; */
 316                         }
 317
 318                 if ((cb != NULL) && (s->state != state))
 319                         {
 320                         new_state=s->state;
 321                         s->state=state;
 322                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 323                         s->state=new_state;
 324                         }
 325                 }
 326 end:
 327         s->in_handshake--;
 328         if (cb != NULL)
 329                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 330         return(ret);
 331         }
 332
 333 static int get_client_master_key(s)
 334 SSL *s;
 335         {
 336         int export,i,n,keya,error=0,ek;
 337         unsigned char *p;
 338         SSL_CIPHER *cp;
 339         EVP_CIPHER *c;
 340         EVP_MD *md;
 341
 342         p=(unsigned char *)s->init_buf->data;
 343         if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
 344                 {
 345                 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
 346
 347                 if (i < (10-s->init_num))
 348                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 349                 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
 350                         {
 351                         if (p[-1] != SSL2_MT_ERROR)
 352                                 {
 353                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 354                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
 355                                 }
 356                         else
 357                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
 358                                         SSL_R_PEER_ERROR);
 359                         return(-1);
 360                         }
 361
 362                 cp=ssl2_get_cipher_by_char(p);
 363                 if (cp == NULL)
 364                         {
 365                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 366                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
 367                                 SSL_R_NO_CIPHER_MATCH);
 368                         return(-1);
 369                         }
 370                 s->session->cipher= cp;
 371
 372                 p+=3;
 373                 n2s(p,i); s->s2->tmp.clear=i;
 374                 n2s(p,i); s->s2->tmp.enc=i;
 375                 n2s(p,i); s->session->key_arg_length=i;
 376                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
 377                 s->init_num=0;
 378                 }
 379
 380         /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
 381         p=(unsigned char *)s->init_buf->data;
 382         keya=s->session->key_arg_length;
 383         n=s->s2->tmp.clear+s->s2->tmp.enc+keya - s->init_num;
 384         i=ssl2_read(s,(char *)&(p[s->init_num]),n);
 385         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 386
 387         memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
 388                 (unsigned int)keya);
 389
 390         if (s->session->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
 391                 {
 392                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 393                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
 394                 return(-1);
 395                 }
 396         i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
 397                 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
 398                 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 399
 400         export=(s->session->cipher->algorithms & SSL_EXP)?1:0;
 401
 402         if (!ssl_cipher_get_evp(s->session->cipher,&c,&md))
 403                 {
 404                 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 405                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 406                 return(0);
 407                 }
 408
 409         if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 410                 {
 411                 export=1;
 412                 ek=8;
 413                 }
 414         else
 415                 ek=5;
 416
 417         /* bad decrypt */
 418 #if 1
 419         /* If a bad decrypt, continue with protocol but with a
 420          * dud master secret */
 421         if ((i < 0) ||
 422                 ((!export && (i != EVP_CIPHER_key_length(c)))
 423                 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
 424                         EVP_CIPHER_key_length(c))))))
 425                 {
 426                 if (export)
 427                         i=ek;
 428                 else
 429                         i=EVP_CIPHER_key_length(c);
 430                 RAND_bytes(p,i);
 431                 }
 432 #else
 433         if (i < 0)
 434                 {
 435                 error=1;
 436                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
 437                 }
 438         /* incorrect number of key bytes for non export cipher */
 439         else if ((!export && (i != EVP_CIPHER_key_length(c)))
 440                 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
 441                         EVP_CIPHER_key_length(c)))))
 442                 {
 443                 error=1;
 444                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
 445                 }
 446         if (error)
 447                 {
 448                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 449                 return(-1);
 450                 }
 451 #endif
 452
 453         if (export) i+=s->s2->tmp.clear;
 454         s->session->master_key_length=i;
 455         memcpy(s->session->master_key,p,(unsigned int)i);
 456         return(1);
 457         }
 458
 459 static int get_client_hello(s)
 460 SSL *s;
 461         {
 462         int i,n;
 463         unsigned char *p;
 464         STACK *cs; /* a stack of SSL_CIPHERS */
 465         STACK *cl; /* the ones we want to use */
 466         int z;
 467
 468         /* This is a bit of a hack to check for the correct packet
 469          * type the first time round. */
 470         if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
 471                 {
 472                 s->first_packet=1;
 473                 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
 474                 }
 475
 476         p=(unsigned char *)s->init_buf->data;
 477         if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
 478                 {
 479                 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
 480                 if (i < (9-s->init_num))
 481                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 482
 483                 if (*(p++) != SSL2_MT_CLIENT_HELLO)
 484                         {
 485                         if (p[-1] != SSL2_MT_ERROR)
 486                                 {
 487                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 488                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
 489                                 }
 490                         else
 491                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
 492                         return(-1);
 493                         }
 494                 n2s(p,i);
 495                 if (i < s->version) s->version=i;
 496                 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
 497                 n2s(p,i); s->s2->tmp.session_id_length=i;
 498                 n2s(p,i); s->s2->challenge_length=i;
 499                 if (    (i < SSL2_MIN_CHALLENGE_LENGTH) ||
 500                         (i > SSL2_MAX_CHALLENGE_LENGTH))
 501                         {
 502                         SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
 503                         return(-1);
 504                         }
 505                 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
 506                 s->init_num=0;
 507                 }
 508
 509         /* SSL2_ST_GET_CLIENT_HELLO_C */
 510         p=(unsigned char *)s->init_buf->data;
 511         n=s->s2->tmp.cipher_spec_length+s->s2->challenge_length+
 512                 s->s2->tmp.session_id_length-s->init_num;
 513         i=ssl2_read(s,(char *)&(p[s->init_num]),n);
 514         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 515
 516         /* get session-id before cipher stuff so we can get out session
 517          * structure if it is cached */
 518         /* session-id */
 519         if ((s->s2->tmp.session_id_length != 0) &&
 520                 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
 521                 {
 522                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 523                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
 524                 return(-1);
 525                 }
 526
 527         if (s->s2->tmp.session_id_length == 0)
 528                 {
 529                 if (!ssl_get_new_session(s,1))
 530                         {
 531                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 532                         return(-1);
 533                         }
 534                 }
 535         else
 536                 {
 537                 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
 538                         s->s2->tmp.session_id_length);
 539                 if (i == 1)
 540                         { /* previous session */
 541                         s->hit=1;
 542                         }
 543                 else if (i == -1)
 544                         {
 545                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 546                         return(-1);
 547                         }
 548                 else
 549                         {
 550                         if (s->cert == NULL)
 551                                 {
 552                                 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 553                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
 554                                 return(-1);
 555                                 }
 556
 557                         if (!ssl_get_new_session(s,1))
 558                                 {
 559                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 560                                 return(-1);
 561                                 }
 562                         }
 563                 }
 564
 565         if (!s->hit)
 566                 {
 567                 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
 568                         &s->session->ciphers);
 569                 if (cs == NULL) goto mem_err;
 570
 571                 cl=ssl_get_ciphers_by_id(s);
 572
 573                 for (z=0; z<sk_num(cs); z++)
 574                         {
 575                         if (sk_find(cl,sk_value(cs,z)) < 0)
 576                                 {
 577                                 sk_delete(cs,z);
 578                                 z--;
 579                                 }
 580                         }
 581
 582                 /* s->session->ciphers should now have a list of
 583                  * ciphers that are on both the client and server.
 584                  * This list is ordered by the order the client sent
 585                  * the ciphers.
 586                  */
 587                 }
 588         p+=s->s2->tmp.cipher_spec_length;
 589         /* done cipher selection */
 590
 591         /* session id extracted already */
 592         p+=s->s2->tmp.session_id_length;
 593
 594         /* challenge */
 595         memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
 596         return(1);
 597 mem_err:
 598         SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 599         return(0);
 600         }
 601
 602 static int server_hello(s)
 603 SSL *s;
 604         {
 605         unsigned char *p,*d;
 606         int n,hit;
 607         STACK *sk;
 608
 609         p=(unsigned char *)s->init_buf->data;
 610         if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
 611                 {
 612                 d=p+11;
 613                 *(p++)=SSL2_MT_SERVER_HELLO;            /* type */
 614                 hit=s->hit;
 615                 *(p++)=(unsigned char)hit;
 616                 if (!hit)
 617                         {                       /* else add cert to session */
 618                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 619                         if (s->session->cert != NULL)
 620                                 ssl_cert_free(s->session->cert);
 621                         s->session->cert=s->cert;
 622                         }
 623                 else    /* We have a session id-cache hit, if the
 624                          * session-id has no certificate listed against
 625                          * the 'cert' structure, grab the 'old' one
 626                          * listed against the SSL connection */
 627                         {
 628                         if (s->session->cert == NULL)
 629                                 {
 630                                 CRYPTO_add(&s->cert->references,1,
 631                                         CRYPTO_LOCK_SSL_CERT);
 632                                 s->session->cert=s->cert;
 633                                 }
 634                         }
 635
 636                 if (s->session->cert == NULL)
 637                         {
 638                         ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 639                         SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
 640                         return(-1);
 641                         }
 642
 643                 if (hit)
 644                         {
 645                         *(p++)=0;               /* no certificate type */
 646                         s2n(s->version,p);      /* version */
 647                         s2n(0,p);               /* cert len */
 648                         s2n(0,p);               /* ciphers len */
 649                         }
 650                 else
 651                         {
 652                         /* EAY EAY */
 653                         /* put certificate type */
 654                         *(p++)=SSL2_CT_X509_CERTIFICATE;
 655                         s2n(s->version,p);      /* version */
 656                         n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 657                         s2n(n,p);               /* certificate length */
 658                         i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
 659                         n=0;
 660
 661                         /* lets send out the ciphers we like in the
 662                          * prefered order */
 663                         sk= s->session->ciphers;
 664                         n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d);
 665                         d+=n;
 666                         s2n(n,p);               /* add cipher length */
 667                         }
 668
 669                 /* make and send conn_id */
 670                 s2n(SSL2_CONNECTION_ID_LENGTH,p);       /* add conn_id length */
 671                 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
 672                 RAND_bytes(s->s2->conn_id,(int)s->s2->conn_id_length);
 673                 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
 674                 d+=SSL2_CONNECTION_ID_LENGTH;
 675
 676                 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
 677                 s->init_num=d-(unsigned char *)s->init_buf->data;
 678                 s->init_off=0;
 679                 }
 680         /* SSL2_ST_SEND_SERVER_HELLO_B */
 681         /* If we are using TCP/IP, the performace is bad if we do 2
 682          * writes without a read between them.  This occurs when
 683          * Session-id reuse is used, so I will put in a buffering module
 684          */
 685         if (s->hit)
 686                 {
 687                 if (!ssl_init_wbio_buffer(s,1)) return(-1);
 688                 }
 689
 690         return(ssl2_do_write(s));
 691         }
 692
 693 static int get_client_finished(s)
 694 SSL *s;
 695         {
 696         unsigned char *p;
 697         int i;
 698
 699         p=(unsigned char *)s->init_buf->data;
 700         if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
 701                 {
 702                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 703                 if (i < 1-s->init_num)
 704                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 705
 706                 if (*p != SSL2_MT_CLIENT_FINISHED)
 707                         {
 708                         if (*p != SSL2_MT_ERROR)
 709                                 {
 710                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 711                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 712                                 }
 713                         else
 714                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
 715                         return(-1);
 716                         }
 717                 s->init_num=0;
 718                 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
 719                 }
 720
 721         /* SSL2_ST_GET_CLIENT_FINISHED_B */
 722         i=ssl2_read(s,(char *)&(p[s->init_num]),s->s2->conn_id_length-s->init_num);
 723         if (i < (int)s->s2->conn_id_length-s->init_num)
 724                 {
 725                 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 726                 }
 727         if (memcmp(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length) != 0)
 728                 {
 729                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 730                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
 731                 return(-1);
 732                 }
 733         return(1);
 734         }
 735
 736 static int server_verify(s)
 737 SSL *s;
 738         {
 739         unsigned char *p;
 740
 741         if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
 742                 {
 743                 p=(unsigned char *)s->init_buf->data;
 744                 *(p++)=SSL2_MT_SERVER_VERIFY;
 745                 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
 746                 /* p+=s->s2->challenge_length; */
 747
 748                 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
 749                 s->init_num=s->s2->challenge_length+1;
 750                 s->init_off=0;
 751                 }
 752         return(ssl2_do_write(s));
 753         }
 754
 755 static int server_finish(s)
 756 SSL *s;
 757         {
 758         unsigned char *p;
 759
 760         if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
 761                 {
 762                 p=(unsigned char *)s->init_buf->data;
 763                 *(p++)=SSL2_MT_SERVER_FINISHED;
 764
 765                 memcpy(p,s->session->session_id,
 766                         (unsigned int)s->session->session_id_length);
 767                 /* p+=s->session->session_id_length; */
 768
 769                 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
 770                 s->init_num=s->session->session_id_length+1;
 771                 s->init_off=0;
 772                 }
 773
 774         /* SSL2_ST_SEND_SERVER_FINISHED_B */
 775         return(ssl2_do_write(s));
 776         }
 777
 778 /* send the request and check the response */
 779 static int request_certificate(s)
 780 SSL *s;
 781         {
 782         unsigned char *p,*p2,*buf2;
 783         unsigned char *ccd;
 784         int i,j,ctype,ret= -1;
 785         X509 *x509=NULL;
 786         STACK *sk=NULL;
 787
 788         ccd=s->s2->tmp.ccl;
 789         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
 790                 {
 791                 p=(unsigned char *)s->init_buf->data;
 792                 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
 793                 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
 794                 RAND_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 795                 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 796
 797                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
 798                 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
 799                 s->init_off=0;
 800                 }
 801
 802         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
 803                 {
 804                 i=ssl2_do_write(s);
 805                 if (i <= 0)
 806                         {
 807                         ret=i;
 808                         goto end;
 809                         }
 810
 811                 s->init_num=0;
 812                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
 813                 }
 814
 815         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
 816                 {
 817                 p=(unsigned char *)s->init_buf->data;
 818                 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num);
 819                 if (i < 3)
 820                         {
 821                         ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 822                         goto end;
 823                         }
 824
 825                 if ((*p == SSL2_MT_ERROR) && (i >= 3))
 826                         {
 827                         n2s(p,i);
 828                         if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
 829                                 {
 830                                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 831                                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
 832                                 goto end;
 833                                 }
 834                         ret=1;
 835                         goto end;
 836                         }
 837                 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (i < 6))
 838                         {
 839                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 840                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
 841                         goto end;
 842                         }
 843                 /* ok we have a response */
 844                 /* certificate type, there is only one right now. */
 845                 ctype= *(p++);
 846                 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 847                         {
 848                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 849                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
 850                         goto end;
 851                         }
 852                 n2s(p,i); s->s2->tmp.clen=i;
 853                 n2s(p,i); s->s2->tmp.rlen=i;
 854                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
 855                 s->init_num=0;
 856                 }
 857
 858         /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
 859         p=(unsigned char *)s->init_buf->data;
 860         j=s->s2->tmp.clen+s->s2->tmp.rlen-s->init_num;
 861         i=ssl2_read(s,(char *)&(p[s->init_num]),j);
 862         if (i < j)
 863                 {
 864                 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 865                 goto end;
 866                 }
 867
 868         x509=(X509 *)d2i_X509(NULL,&p,(long)s->s2->tmp.clen);
 869         if (x509 == NULL)
 870                 {
 871                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
 872                 goto msg_end;
 873                 }
 874
 875         if (((sk=sk_new_null()) == NULL) || (!sk_push(sk,(char *)x509)))
 876                 {
 877                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 878                 goto msg_end;
 879                 }
 880
 881         i=ssl_verify_cert_chain(s,sk);
 882
 883         if (i)  /* we like the packet, now check the chksum */
 884                 {
 885                 EVP_MD_CTX ctx;
 886                 EVP_PKEY *pkey=NULL;
 887
 888                 EVP_VerifyInit(&ctx,s->ctx->rsa_md5);
 889                 EVP_VerifyUpdate(&ctx,s->s2->key_material,
 890                         (unsigned int)s->s2->key_material_length);
 891                 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 892
 893                 i=i2d_X509(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 894                 buf2=(unsigned char *)Malloc((unsigned int)i);
 895                 if (buf2 == NULL)
 896                         {
 897                         SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 898                         goto msg_end;
 899                         }
 900                 p2=buf2;
 901                 i=i2d_X509(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
 902                 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
 903                 Free(buf2);
 904
 905                 pkey=X509_get_pubkey(x509);
 906                 if (pkey == NULL) goto end;
 907                 i=EVP_VerifyFinal(&ctx,p,s->s2->tmp.rlen,pkey);
 908                 memset(&ctx,0,sizeof(ctx));
 909
 910                 if (i)
 911                         {
 912                         if (s->session->peer != NULL)
 913                                 X509_free(s->session->peer);
 914                         s->session->peer=x509;
 915                         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
 916                         ret=1;
 917                         goto end;
 918                         }
 919                 else
 920                         {
 921                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
 922                         goto msg_end;
 923                         }
 924                 }
 925         else
 926                 {
 927 msg_end:
 928                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 929                 }
 930 end:
 931         if (sk != NULL) sk_free(sk);
 932         if (x509 != NULL) X509_free(x509);
 933         return(ret);
 934         }
 935
 936 static int ssl_rsa_private_decrypt(c, len, from, to,padding)
 937 CERT *c;
 938 int len;
 939 unsigned char *from;
 940 unsigned char *to;
 941 int padding;
 942         {
 943         RSA *rsa;
 944         int i;
 945
 946         if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
 947                 {
 948                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
 949                 return(-1);
 950                 }
 951         if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
 952                 {
 953                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 954                 return(-1);
 955                 }
 956         rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
 957
 958         /* we have the public key */
 959         i=RSA_private_decrypt(len,from,to,rsa,padding);
 960         if (i < 0)
 961                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
 962         return(i);
 963         }
 964