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,ek;
 337 #if 0
 338         int error=0;
 339 #endif
 340         unsigned char *p;
 341         SSL_CIPHER *cp;
 342         EVP_CIPHER *c;
 343         EVP_MD *md;
 344
 345         p=(unsigned char *)s->init_buf->data;
 346         if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
 347                 {
 348                 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
 349
 350                 if (i < (10-s->init_num))
 351                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 352                 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
 353                         {
 354                         if (p[-1] != SSL2_MT_ERROR)
 355                                 {
 356                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 357                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
 358                                 }
 359                         else
 360                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
 361                                         SSL_R_PEER_ERROR);
 362                         return(-1);
 363                         }
 364
 365                 cp=ssl2_get_cipher_by_char(p);
 366                 if (cp == NULL)
 367                         {
 368                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 369                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
 370                                 SSL_R_NO_CIPHER_MATCH);
 371                         return(-1);
 372                         }
 373                 s->session->cipher= cp;
 374
 375                 p+=3;
 376                 n2s(p,i); s->s2->tmp.clear=i;
 377                 n2s(p,i); s->s2->tmp.enc=i;
 378                 n2s(p,i); s->session->key_arg_length=i;
 379                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
 380                 s->init_num=0;
 381                 }
 382
 383         /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
 384         p=(unsigned char *)s->init_buf->data;
 385         keya=s->session->key_arg_length;
 386         n=s->s2->tmp.clear+s->s2->tmp.enc+keya - s->init_num;
 387         i=ssl2_read(s,(char *)&(p[s->init_num]),n);
 388         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 389
 390         memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
 391                 (unsigned int)keya);
 392
 393         if (s->session->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
 394                 {
 395                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 396                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
 397                 return(-1);
 398                 }
 399         i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
 400                 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
 401                 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 402
 403         export=(s->session->cipher->algorithms & SSL_EXP)?1:0;
 404
 405         if (!ssl_cipher_get_evp(s->session->cipher,&c,&md))
 406                 {
 407                 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 408                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 409                 return(0);
 410                 }
 411
 412         if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 413                 {
 414                 export=1;
 415                 ek=8;
 416                 }
 417         else
 418                 ek=5;
 419
 420         /* bad decrypt */
 421 #if 1
 422         /* If a bad decrypt, continue with protocol but with a
 423          * dud master secret */
 424         if ((i < 0) ||
 425                 ((!export && (i != EVP_CIPHER_key_length(c)))
 426                 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
 427                         EVP_CIPHER_key_length(c))))))
 428                 {
 429                 if (export)
 430                         i=ek;
 431                 else
 432                         i=EVP_CIPHER_key_length(c);
 433                 RAND_bytes(p,i);
 434                 }
 435 #else
 436         if (i < 0)
 437                 {
 438                 error=1;
 439                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
 440                 }
 441         /* incorrect number of key bytes for non export cipher */
 442         else if ((!export && (i != EVP_CIPHER_key_length(c)))
 443                 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
 444                         EVP_CIPHER_key_length(c)))))
 445                 {
 446                 error=1;
 447                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
 448                 }
 449         if (error)
 450                 {
 451                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 452                 return(-1);
 453                 }
 454 #endif
 455
 456         if (export) i+=s->s2->tmp.clear;
 457         s->session->master_key_length=i;
 458         memcpy(s->session->master_key,p,(unsigned int)i);
 459         return(1);
 460         }
 461
 462 static int get_client_hello(s)
 463 SSL *s;
 464         {
 465         int i,n;
 466         unsigned char *p;
 467         STACK *cs; /* a stack of SSL_CIPHERS */
 468         STACK *cl; /* the ones we want to use */
 469         int z;
 470
 471         /* This is a bit of a hack to check for the correct packet
 472          * type the first time round. */
 473         if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
 474                 {
 475                 s->first_packet=1;
 476                 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
 477                 }
 478
 479         p=(unsigned char *)s->init_buf->data;
 480         if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
 481                 {
 482                 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
 483                 if (i < (9-s->init_num))
 484                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 485
 486                 if (*(p++) != SSL2_MT_CLIENT_HELLO)
 487                         {
 488                         if (p[-1] != SSL2_MT_ERROR)
 489                                 {
 490                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 491                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
 492                                 }
 493                         else
 494                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
 495                         return(-1);
 496                         }
 497                 n2s(p,i);
 498                 if (i < s->version) s->version=i;
 499                 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
 500                 n2s(p,i); s->s2->tmp.session_id_length=i;
 501                 n2s(p,i); s->s2->challenge_length=i;
 502                 if (    (i < SSL2_MIN_CHALLENGE_LENGTH) ||
 503                         (i > SSL2_MAX_CHALLENGE_LENGTH))
 504                         {
 505                         SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
 506                         return(-1);
 507                         }
 508                 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
 509                 s->init_num=0;
 510                 }
 511
 512         /* SSL2_ST_GET_CLIENT_HELLO_C */
 513         p=(unsigned char *)s->init_buf->data;
 514         n=s->s2->tmp.cipher_spec_length+s->s2->challenge_length+
 515                 s->s2->tmp.session_id_length-s->init_num;
 516         i=ssl2_read(s,(char *)&(p[s->init_num]),n);
 517         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 518
 519         /* get session-id before cipher stuff so we can get out session
 520          * structure if it is cached */
 521         /* session-id */
 522         if ((s->s2->tmp.session_id_length != 0) &&
 523                 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
 524                 {
 525                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 526                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
 527                 return(-1);
 528                 }
 529
 530         if (s->s2->tmp.session_id_length == 0)
 531                 {
 532                 if (!ssl_get_new_session(s,1))
 533                         {
 534                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 535                         return(-1);
 536                         }
 537                 }
 538         else
 539                 {
 540                 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
 541                         s->s2->tmp.session_id_length);
 542                 if (i == 1)
 543                         { /* previous session */
 544                         s->hit=1;
 545                         }
 546                 else if (i == -1)
 547                         {
 548                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 549                         return(-1);
 550                         }
 551                 else
 552                         {
 553                         if (s->cert == NULL)
 554                                 {
 555                                 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 556                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
 557                                 return(-1);
 558                                 }
 559
 560                         if (!ssl_get_new_session(s,1))
 561                                 {
 562                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 563                                 return(-1);
 564                                 }
 565                         }
 566                 }
 567
 568         if (!s->hit)
 569                 {
 570                 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
 571                         &s->session->ciphers);
 572                 if (cs == NULL) goto mem_err;
 573
 574                 cl=ssl_get_ciphers_by_id(s);
 575
 576                 for (z=0; z<sk_num(cs); z++)
 577                         {
 578                         if (sk_find(cl,sk_value(cs,z)) < 0)
 579                                 {
 580                                 sk_delete(cs,z);
 581                                 z--;
 582                                 }
 583                         }
 584
 585                 /* s->session->ciphers should now have a list of
 586                  * ciphers that are on both the client and server.
 587                  * This list is ordered by the order the client sent
 588                  * the ciphers.
 589                  */
 590                 }
 591         p+=s->s2->tmp.cipher_spec_length;
 592         /* done cipher selection */
 593
 594         /* session id extracted already */
 595         p+=s->s2->tmp.session_id_length;
 596
 597         /* challenge */
 598         memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
 599         return(1);
 600 mem_err:
 601         SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 602         return(0);
 603         }
 604
 605 static int server_hello(s)
 606 SSL *s;
 607         {
 608         unsigned char *p,*d;
 609         int n,hit;
 610         STACK *sk;
 611
 612         p=(unsigned char *)s->init_buf->data;
 613         if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
 614                 {
 615                 d=p+11;
 616                 *(p++)=SSL2_MT_SERVER_HELLO;            /* type */
 617                 hit=s->hit;
 618                 *(p++)=(unsigned char)hit;
 619                 if (!hit)
 620                         {                       /* else add cert to session */
 621                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 622                         if (s->session->cert != NULL)
 623                                 ssl_cert_free(s->session->cert);
 624                         s->session->cert=s->cert;
 625                         }
 626                 else    /* We have a session id-cache hit, if the
 627                          * session-id has no certificate listed against
 628                          * the 'cert' structure, grab the 'old' one
 629                          * listed against the SSL connection */
 630                         {
 631                         if (s->session->cert == NULL)
 632                                 {
 633                                 CRYPTO_add(&s->cert->references,1,
 634                                         CRYPTO_LOCK_SSL_CERT);
 635                                 s->session->cert=s->cert;
 636                                 }
 637                         }
 638
 639                 if (s->session->cert == NULL)
 640                         {
 641                         ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 642                         SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
 643                         return(-1);
 644                         }
 645
 646                 if (hit)
 647                         {
 648                         *(p++)=0;               /* no certificate type */
 649                         s2n(s->version,p);      /* version */
 650                         s2n(0,p);               /* cert len */
 651                         s2n(0,p);               /* ciphers len */
 652                         }
 653                 else
 654                         {
 655                         /* EAY EAY */
 656                         /* put certificate type */
 657                         *(p++)=SSL2_CT_X509_CERTIFICATE;
 658                         s2n(s->version,p);      /* version */
 659                         n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 660                         s2n(n,p);               /* certificate length */
 661                         i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
 662                         n=0;
 663
 664                         /* lets send out the ciphers we like in the
 665                          * prefered order */
 666                         sk= s->session->ciphers;
 667                         n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d);
 668                         d+=n;
 669                         s2n(n,p);               /* add cipher length */
 670                         }
 671
 672                 /* make and send conn_id */
 673                 s2n(SSL2_CONNECTION_ID_LENGTH,p);       /* add conn_id length */
 674                 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
 675                 RAND_bytes(s->s2->conn_id,(int)s->s2->conn_id_length);
 676                 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
 677                 d+=SSL2_CONNECTION_ID_LENGTH;
 678
 679                 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
 680                 s->init_num=d-(unsigned char *)s->init_buf->data;
 681                 s->init_off=0;
 682                 }
 683         /* SSL2_ST_SEND_SERVER_HELLO_B */
 684         /* If we are using TCP/IP, the performace is bad if we do 2
 685          * writes without a read between them.  This occurs when
 686          * Session-id reuse is used, so I will put in a buffering module
 687          */
 688         if (s->hit)
 689                 {
 690                 if (!ssl_init_wbio_buffer(s,1)) return(-1);
 691                 }
 692
 693         return(ssl2_do_write(s));
 694         }
 695
 696 static int get_client_finished(s)
 697 SSL *s;
 698         {
 699         unsigned char *p;
 700         int i;
 701
 702         p=(unsigned char *)s->init_buf->data;
 703         if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
 704                 {
 705                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 706                 if (i < 1-s->init_num)
 707                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 708
 709                 if (*p != SSL2_MT_CLIENT_FINISHED)
 710                         {
 711                         if (*p != SSL2_MT_ERROR)
 712                                 {
 713                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 714                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 715                                 }
 716                         else
 717                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
 718                         return(-1);
 719                         }
 720                 s->init_num=0;
 721                 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
 722                 }
 723
 724         /* SSL2_ST_GET_CLIENT_FINISHED_B */
 725         i=ssl2_read(s,(char *)&(p[s->init_num]),s->s2->conn_id_length-s->init_num);
 726         if (i < (int)s->s2->conn_id_length-s->init_num)
 727                 {
 728                 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 729                 }
 730         if (memcmp(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length) != 0)
 731                 {
 732                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 733                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
 734                 return(-1);
 735                 }
 736         return(1);
 737         }
 738
 739 static int server_verify(s)
 740 SSL *s;
 741         {
 742         unsigned char *p;
 743
 744         if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
 745                 {
 746                 p=(unsigned char *)s->init_buf->data;
 747                 *(p++)=SSL2_MT_SERVER_VERIFY;
 748                 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
 749                 /* p+=s->s2->challenge_length; */
 750
 751                 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
 752                 s->init_num=s->s2->challenge_length+1;
 753                 s->init_off=0;
 754                 }
 755         return(ssl2_do_write(s));
 756         }
 757
 758 static int server_finish(s)
 759 SSL *s;
 760         {
 761         unsigned char *p;
 762
 763         if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
 764                 {
 765                 p=(unsigned char *)s->init_buf->data;
 766                 *(p++)=SSL2_MT_SERVER_FINISHED;
 767
 768                 memcpy(p,s->session->session_id,
 769                         (unsigned int)s->session->session_id_length);
 770                 /* p+=s->session->session_id_length; */
 771
 772                 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
 773                 s->init_num=s->session->session_id_length+1;
 774                 s->init_off=0;
 775                 }
 776
 777         /* SSL2_ST_SEND_SERVER_FINISHED_B */
 778         return(ssl2_do_write(s));
 779         }
 780
 781 /* send the request and check the response */
 782 static int request_certificate(s)
 783 SSL *s;
 784         {
 785         unsigned char *p,*p2,*buf2;
 786         unsigned char *ccd;
 787         int i,j,ctype,ret= -1;
 788         X509 *x509=NULL;
 789         STACK *sk=NULL;
 790
 791         ccd=s->s2->tmp.ccl;
 792         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
 793                 {
 794                 p=(unsigned char *)s->init_buf->data;
 795                 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
 796                 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
 797                 RAND_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 798                 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 799
 800                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
 801                 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
 802                 s->init_off=0;
 803                 }
 804
 805         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
 806                 {
 807                 i=ssl2_do_write(s);
 808                 if (i <= 0)
 809                         {
 810                         ret=i;
 811                         goto end;
 812                         }
 813
 814                 s->init_num=0;
 815                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
 816                 }
 817
 818         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
 819                 {
 820                 p=(unsigned char *)s->init_buf->data;
 821                 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num);
 822                 if (i < 3)
 823                         {
 824                         ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 825                         goto end;
 826                         }
 827
 828                 if ((*p == SSL2_MT_ERROR) && (i >= 3))
 829                         {
 830                         n2s(p,i);
 831                         if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
 832                                 {
 833                                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 834                                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
 835                                 goto end;
 836                                 }
 837                         ret=1;
 838                         goto end;
 839                         }
 840                 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (i < 6))
 841                         {
 842                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 843                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
 844                         goto end;
 845                         }
 846                 /* ok we have a response */
 847                 /* certificate type, there is only one right now. */
 848                 ctype= *(p++);
 849                 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 850                         {
 851                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 852                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
 853                         goto end;
 854                         }
 855                 n2s(p,i); s->s2->tmp.clen=i;
 856                 n2s(p,i); s->s2->tmp.rlen=i;
 857                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
 858                 s->init_num=0;
 859                 }
 860
 861         /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
 862         p=(unsigned char *)s->init_buf->data;
 863         j=s->s2->tmp.clen+s->s2->tmp.rlen-s->init_num;
 864         i=ssl2_read(s,(char *)&(p[s->init_num]),j);
 865         if (i < j)
 866                 {
 867                 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 868                 goto end;
 869                 }
 870
 871         x509=(X509 *)d2i_X509(NULL,&p,(long)s->s2->tmp.clen);
 872         if (x509 == NULL)
 873                 {
 874                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
 875                 goto msg_end;
 876                 }
 877
 878         if (((sk=sk_new_null()) == NULL) || (!sk_push(sk,(char *)x509)))
 879                 {
 880                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 881                 goto msg_end;
 882                 }
 883
 884         i=ssl_verify_cert_chain(s,sk);
 885
 886         if (i)  /* we like the packet, now check the chksum */
 887                 {
 888                 EVP_MD_CTX ctx;
 889                 EVP_PKEY *pkey=NULL;
 890
 891                 EVP_VerifyInit(&ctx,s->ctx->rsa_md5);
 892                 EVP_VerifyUpdate(&ctx,s->s2->key_material,
 893                         (unsigned int)s->s2->key_material_length);
 894                 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 895
 896                 i=i2d_X509(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 897                 buf2=(unsigned char *)Malloc((unsigned int)i);
 898                 if (buf2 == NULL)
 899                         {
 900                         SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 901                         goto msg_end;
 902                         }
 903                 p2=buf2;
 904                 i=i2d_X509(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
 905                 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
 906                 Free(buf2);
 907
 908                 pkey=X509_get_pubkey(x509);
 909                 if (pkey == NULL) goto end;
 910                 i=EVP_VerifyFinal(&ctx,p,s->s2->tmp.rlen,pkey);
 911                 memset(&ctx,0,sizeof(ctx));
 912
 913                 if (i)
 914                         {
 915                         if (s->session->peer != NULL)
 916                                 X509_free(s->session->peer);
 917                         s->session->peer=x509;
 918                         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
 919                         ret=1;
 920                         goto end;
 921                         }
 922                 else
 923                         {
 924                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
 925                         goto msg_end;
 926                         }
 927                 }
 928         else
 929                 {
 930 msg_end:
 931                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 932                 }
 933 end:
 934         if (sk != NULL) sk_free(sk);
 935         if (x509 != NULL) X509_free(x509);
 936         return(ret);
 937         }
 938
 939 static int ssl_rsa_private_decrypt(c, len, from, to,padding)
 940 CERT *c;
 941 int len;
 942 unsigned char *from;
 943 unsigned char *to;
 944 int padding;
 945         {
 946         RSA *rsa;
 947         int i;
 948
 949         if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
 950                 {
 951                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
 952                 return(-1);
 953                 }
 954         if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
 955                 {
 956                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 957                 return(-1);
 958                 }
 959         rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
 960
 961         /* we have the public key */
 962         i=RSA_private_decrypt(len,from,to,rsa,padding);
 963         if (i < 0)
 964                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
 965         return(i);
 966         }
 967