ssl/s2_srvr.c

   1 /* ssl/s2_srvr.c */
   2 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #ifdef NO_MD5
  61 #include "md5.h"
  62 #endif
  63 #include "bio.h"
  64 #include "rand.h"
  65 #include "objects.h"
  66 #include "ssl_locl.h"
  67 #include "evp.h"
  68
  69 #ifndef NOPROTO
  70 static int get_client_master_key(SSL *s);
  71 static int get_client_hello(SSL *s);
  72 static int server_hello(SSL *s);
  73 static int get_client_finished(SSL *s);
  74 static int server_verify(SSL *s);
  75 static int server_finish(SSL *s);
  76 static int request_certificate(SSL *s);
  77 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
  78         unsigned char *to,int padding);
  79 #else
  80 static int get_client_master_key();
  81 static int get_client_hello();
  82 static int server_hello();
  83 static int get_client_finished();
  84 static int server_verify();
  85 static int server_finish();
  86 static int request_certificate();
  87 static int ssl_rsa_private_decrypt();
  88 #endif
  89
  90 #define BREAK   break
  91
  92 static SSL_METHOD *ssl2_get_server_method(ver)
  93 int ver;
  94         {
  95         if (ver == 2)
  96                 return(SSLv2_server_method());
  97         else
  98                 return(NULL);
  99         }
 100
 101 SSL_METHOD *SSLv2_server_method()
 102         {
 103         static int init=1;
 104         static SSL_METHOD SSLv2_server_data;
 105
 106         if (init)
 107                 {
 108                 init=0;
 109                 memcpy((char *)&SSLv2_server_data,(char *)sslv2_base_method(),
 110                         sizeof(SSL_METHOD));
 111                 SSLv2_server_data.ssl_accept=ssl2_accept;
 112                 SSLv2_server_data.get_ssl_method=ssl2_get_server_method;
 113                 }
 114         return(&SSLv2_server_data);
 115         }
 116
 117 int ssl2_accept(s)
 118 SSL *s;
 119         {
 120         unsigned long l=time(NULL);
 121         BUF_MEM *buf=NULL;
 122         int ret= -1;
 123         long num1;
 124         void (*cb)()=NULL;
 125         int new_state,state;
 126
 127         RAND_seed((unsigned char *)&l,sizeof(l));
 128         ERR_clear_error();
 129         errno=0;
 130
 131         if (s->info_callback != NULL)
 132                 cb=s->info_callback;
 133         else if (s->ctx->info_callback != NULL)
 134                 cb=s->ctx->info_callback;
 135
 136         /* init things to blank */
 137         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 138         s->in_handshake++;
 139
 140         if (((s->session == NULL) || (s->session->cert == NULL)) &&
 141                 (s->cert == NULL))
 142                 {
 143                 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 144                 return(-1);
 145                 }
 146
 147         errno=0;
 148         for (;;)
 149                 {
 150                 state=s->state;
 151
 152                 switch (s->state)
 153                         {
 154                 case SSL_ST_BEFORE:
 155                 case SSL_ST_ACCEPT:
 156                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 157                 case SSL_ST_OK|SSL_ST_ACCEPT:
 158
 159                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 160
 161                         s->version=2;
 162                         s->type=SSL_ST_ACCEPT;
 163
 164                         buf=s->init_buf;
 165                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 166                                 { ret= -1; goto end; }
 167                         if (!BUF_MEM_grow(buf,(int)
 168                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 169                                 { ret= -1; goto end; }
 170                         s->init_buf=buf;
 171                         s->init_num=0;
 172                         s->ctx->sess_accept++;
 173                         s->handshake_func=ssl2_accept;
 174                         s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 175                         BREAK;
 176
 177                 case SSL2_ST_GET_CLIENT_HELLO_A:
 178                 case SSL2_ST_GET_CLIENT_HELLO_B:
 179                 case SSL2_ST_GET_CLIENT_HELLO_C:
 180                         s->shutdown=0;
 181                         ret=get_client_hello(s);
 182                         if (ret <= 0) goto end;
 183                         s->init_num=0;
 184                         s->state=SSL2_ST_SEND_SERVER_HELLO_A;
 185                         BREAK;
 186
 187                 case SSL2_ST_SEND_SERVER_HELLO_A:
 188                 case SSL2_ST_SEND_SERVER_HELLO_B:
 189                         ret=server_hello(s);
 190                         if (ret <= 0) goto end;
 191                         s->init_num=0;
 192                         if (!s->hit)
 193                                 {
 194                                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
 195                                 BREAK;
 196                                 }
 197                         else
 198                                 {
 199                                 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 200                                 BREAK;
 201                                 }
 202                 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
 203                 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
 204                         ret=get_client_master_key(s);
 205                         if (ret <= 0) goto end;
 206                         s->init_num=0;
 207                         s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 208                         BREAK;
 209
 210                 case SSL2_ST_SERVER_START_ENCRYPTION:
 211                         /* Ok we how have sent all the stuff needed to
 212                          * start encrypting, the next packet back will
 213                          * be encrypted. */
 214                         if (!ssl2_enc_init(s,0))
 215                                 { ret= -1; goto end; }
 216                         s->s2->clear_text=0;
 217                         s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
 218                         BREAK;
 219
 220                 case SSL2_ST_SEND_SERVER_VERIFY_A:
 221                 case SSL2_ST_SEND_SERVER_VERIFY_B:
 222                         ret=server_verify(s);
 223                         if (ret <= 0) goto end;
 224                         s->init_num=0;
 225                         if (s->hit)
 226                                 {
 227                                 /* If we are in here, we have been
 228                                  * buffering the output, so we need to
 229                                  * flush it and remove buffering from
 230                                  * future traffic */
 231                                 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
 232                                 BREAK;
 233                                 }
 234                         else
 235                                 {
 236                                 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 237                                 break;
 238                                 }
 239
 240                 case SSL2_ST_SEND_SERVER_VERIFY_C:
 241                         /* get the number of bytes to write */
 242                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 243                         if (num1 != 0)
 244                                 {
 245                                 s->rwstate=SSL_WRITING;
 246                                 num1=BIO_flush(s->wbio);
 247                                 if (num1 <= 0) { ret= -1; goto end; }
 248                                 s->rwstate=SSL_NOTHING;
 249                                 }
 250
 251                         /* flushed and now remove buffering */
 252                         s->wbio=BIO_pop(s->wbio);
 253
 254                         s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 255                         BREAK;
 256
 257                 case SSL2_ST_GET_CLIENT_FINISHED_A:
 258                 case SSL2_ST_GET_CLIENT_FINISHED_B:
 259                         ret=get_client_finished(s);
 260                         if (ret <= 0)
 261                                 goto end;
 262                         s->init_num=0;
 263                         s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
 264                         BREAK;
 265
 266                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
 267                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
 268                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
 269                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
 270                         /* don't do a 'request certificate' if we
 271                          * don't want to, or we already have one, and
 272                          * we only want to do it once. */
 273                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 274                                 ((s->session->peer != NULL) &&
 275                                 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 276                                 {
 277                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 278                                 break;
 279                                 }
 280                         else
 281                                 {
 282                                 ret=request_certificate(s);
 283                                 if (ret <= 0) goto end;
 284                                 s->init_num=0;
 285                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 286                                 }
 287                         BREAK;
 288
 289                 case SSL2_ST_SEND_SERVER_FINISHED_A:
 290                 case SSL2_ST_SEND_SERVER_FINISHED_B:
 291                         ret=server_finish(s);
 292                         if (ret <= 0) goto end;
 293                         s->init_num=0;
 294                         s->state=SSL_ST_OK;
 295                         break;
 296
 297                 case SSL_ST_OK:
 298                         BUF_MEM_free(s->init_buf);
 299                         s->init_buf=NULL;
 300                         s->init_num=0;
 301                 /*      ERR_clear_error();*/
 302
 303                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 304
 305                         s->ctx->sess_accept_good++;
 306                         /* s->server=1; */
 307                         ret=1;
 308
 309                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 310
 311                         goto end;
 312                         BREAK;
 313
 314                 default:
 315                         SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
 316                         ret= -1;
 317                         goto end;
 318                         BREAK;
 319                         }
 320
 321                 if ((cb != NULL) && (s->state != state))
 322                         {
 323                         new_state=s->state;
 324                         s->state=state;
 325                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 326                         s->state=new_state;
 327                         }
 328                 }
 329 end:
 330         s->in_handshake--;
 331         if (cb != NULL)
 332                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 333         return(ret);
 334         }
 335
 336 static int get_client_master_key(s)
 337 SSL *s;
 338         {
 339         int export,i,n,keya,ek;
 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->key->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,s->s2->tmp.session_id_length,
 541                         &(p[s->s2->tmp.cipher_spec_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->key->x509,NULL);
 660                         s2n(n,p);               /* certificate length */
 661                         i2d_X509(s->cert->key->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                 BIO *buf;
 691
 692                 if (s->bbio == NULL)
 693                         {
 694                         buf=BIO_new(BIO_f_buffer());
 695                         if (buf == NULL)
 696                                 {
 697                                 SSLerr(SSL_F_SERVER_HELLO,ERR_LIB_BUF);
 698                                 return(-1);
 699                                 }
 700                         s->bbio=buf;
 701                         }
 702                 else
 703                         buf=s->bbio;
 704
 705                 BIO_reset(buf);
 706                 s->wbio=BIO_push(buf,s->wbio);
 707                 }
 708
 709         return(ssl2_do_write(s));
 710         }
 711
 712 static int get_client_finished(s)
 713 SSL *s;
 714         {
 715         unsigned char *p;
 716         int i;
 717
 718         p=(unsigned char *)s->init_buf->data;
 719         if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
 720                 {
 721                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 722                 if (i < 1-s->init_num)
 723                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 724
 725                 if (*p != SSL2_MT_CLIENT_FINISHED)
 726                         {
 727                         if (*p != SSL2_MT_ERROR)
 728                                 {
 729                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 730                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 731                                 }
 732                         else
 733                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
 734                         return(-1);
 735                         }
 736                 s->init_num=0;
 737                 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
 738                 }
 739
 740         /* SSL2_ST_GET_CLIENT_FINISHED_B */
 741         i=ssl2_read(s,(char *)&(p[s->init_num]),s->s2->conn_id_length-s->init_num);
 742         if (i < (int)s->s2->conn_id_length-s->init_num)
 743                 {
 744                 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 745                 }
 746         if (memcmp(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length) != 0)
 747                 {
 748                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 749                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
 750                 return(-1);
 751                 }
 752         return(1);
 753         }
 754
 755 static int server_verify(s)
 756 SSL *s;
 757         {
 758         unsigned char *p;
 759
 760         if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
 761                 {
 762                 p=(unsigned char *)s->init_buf->data;
 763                 *(p++)=SSL2_MT_SERVER_VERIFY;
 764                 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
 765                 /* p+=s->s2->challenge_length; */
 766
 767                 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
 768                 s->init_num=s->s2->challenge_length+1;
 769                 s->init_off=0;
 770                 }
 771         return(ssl2_do_write(s));
 772         }
 773
 774 static int server_finish(s)
 775 SSL *s;
 776         {
 777         unsigned char *p;
 778
 779         if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
 780                 {
 781                 p=(unsigned char *)s->init_buf->data;
 782                 *(p++)=SSL2_MT_SERVER_FINISHED;
 783
 784                 memcpy(p,s->session->session_id,
 785                         (unsigned int)s->session->session_id_length);
 786                 /* p+=s->session->session_id_length; */
 787
 788                 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
 789                 s->init_num=s->session->session_id_length+1;
 790                 s->init_off=0;
 791                 }
 792
 793         /* SSL2_ST_SEND_SERVER_FINISHED_B */
 794         return(ssl2_do_write(s));
 795         }
 796
 797 /* send the request and check the response */
 798 static int request_certificate(s)
 799 SSL *s;
 800         {
 801         unsigned char *p,*p2,*buf2;
 802         unsigned char *ccd;
 803         int i,j,ctype,ret= -1;
 804         X509 *x509=NULL;
 805         STACK *sk=NULL;
 806
 807         ccd=s->s2->tmp.ccl;
 808         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
 809                 {
 810                 p=(unsigned char *)s->init_buf->data;
 811                 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
 812                 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
 813                 RAND_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 814                 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 815
 816                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
 817                 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
 818                 s->init_off=0;
 819                 }
 820
 821         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
 822                 {
 823                 i=ssl2_do_write(s);
 824                 if (i <= 0)
 825                         {
 826                         ret=i;
 827                         goto end;
 828                         }
 829
 830                 s->init_num=0;
 831                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
 832                 }
 833
 834         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
 835                 {
 836                 p=(unsigned char *)s->init_buf->data;
 837                 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num);
 838                 if (i < 3)
 839                         {
 840                         ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 841                         goto end;
 842                         }
 843
 844                 if ((*p == SSL2_MT_ERROR) && (i >= 3))
 845                         {
 846                         n2s(p,i);
 847                         if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
 848                                 {
 849                                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 850                                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
 851                                 goto end;
 852                                 }
 853                         ret=1;
 854                         goto end;
 855                         }
 856                 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (i < 6))
 857                         {
 858                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 859                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
 860                         goto end;
 861                         }
 862                 /* ok we have a response */
 863                 /* certificate type, there is only one right now. */
 864                 ctype= *(p++);
 865                 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 866                         {
 867                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 868                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
 869                         goto end;
 870                         }
 871                 n2s(p,i); s->s2->tmp.clen=i;
 872                 n2s(p,i); s->s2->tmp.rlen=i;
 873                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
 874                 s->init_num=0;
 875                 }
 876
 877         /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
 878         p=(unsigned char *)s->init_buf->data;
 879         j=s->s2->tmp.clen+s->s2->tmp.rlen-s->init_num;
 880         i=ssl2_read(s,(char *)&(p[s->init_num]),j);
 881         if (i < j)
 882                 {
 883                 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 884                 goto end;
 885                 }
 886
 887         x509=(X509 *)d2i_X509(NULL,&p,(long)s->s2->tmp.clen);
 888         if (x509 == NULL)
 889                 {
 890                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
 891                 goto msg_end;
 892                 }
 893
 894         if (((sk=sk_new_null()) == NULL) || (!sk_push(sk,(char *)x509)))
 895                 {
 896                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 897                 goto msg_end;
 898                 }
 899
 900         i=ssl_verify_cert_chain(s,sk);
 901
 902         if (i)  /* we like the packet, now check the chksum */
 903                 {
 904                 EVP_MD_CTX ctx;
 905                 EVP_PKEY *pkey=NULL;
 906
 907                 EVP_VerifyInit(&ctx,EVP_md5());
 908                 EVP_VerifyUpdate(&ctx,s->s2->key_material,
 909                         (unsigned int)s->s2->key_material_length);
 910                 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 911
 912                 i=i2d_X509(s->session->cert->key->x509,NULL);
 913                 buf2=(unsigned char *)Malloc((unsigned int)i);
 914                 if (buf2 == NULL)
 915                         {
 916                         SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 917                         goto msg_end;
 918                         }
 919                 p2=buf2;
 920                 i=i2d_X509(s->session->cert->key->x509,&p2);
 921                 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
 922                 Free(buf2);
 923
 924                 pkey=X509_get_pubkey(x509);
 925                 if (pkey == NULL) goto end;
 926                 i=EVP_VerifyFinal(&ctx,p,s->s2->tmp.rlen,pkey);
 927                 memset(&ctx,0,sizeof(ctx));
 928
 929                 if (i)
 930                         {
 931                         if (s->session->peer != NULL)
 932                                 X509_free(s->session->peer);
 933                         s->session->peer=x509;
 934                         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
 935                         ret=1;
 936                         goto end;
 937                         }
 938                 else
 939                         {
 940                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
 941                         goto msg_end;
 942                         }
 943                 }
 944         else
 945                 {
 946 msg_end:
 947                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 948                 }
 949 end:
 950         if (sk != NULL) sk_free(sk);
 951         if (x509 != NULL) X509_free(x509);
 952         return(ret);
 953         }
 954
 955 static int ssl_rsa_private_decrypt(c, len, from, to,padding)
 956 CERT *c;
 957 int len;
 958 unsigned char *from;
 959 unsigned char *to;
 960 int padding;
 961         {
 962         RSA *rsa;
 963         int i;
 964
 965         if ((c == NULL) || (c->key->privatekey == NULL))
 966                 {
 967                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
 968                 return(-1);
 969                 }
 970         if (c->key->privatekey->type != EVP_PKEY_RSA)
 971                 {
 972                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 973                 return(-1);
 974                 }
 975         rsa=c->key->privatekey->pkey.rsa;
 976
 977         /* we have the public key */
 978         i=RSA_private_decrypt(len,from,to,rsa,padding);
 979         if (i < 0)
 980                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
 981         return(i);
 982         }
 983