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 SSL_METHOD *ssl2_get_server_method(int ver);
  68 static int get_client_master_key(SSL *s);
  69 static int get_client_hello(SSL *s);
  70 static int server_hello(SSL *s);
  71 static int get_client_finished(SSL *s);
  72 static int server_verify(SSL *s);
  73 static int server_finish(SSL *s);
  74 static int request_certificate(SSL *s);
  75 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
  76         unsigned char *to,int padding);
  77 #else
  78 static SSL_METHOD *ssl2_get_server_method();
  79 static int get_client_master_key();
  80 static int get_client_hello();
  81 static int server_hello();
  82 static int get_client_finished();
  83 static int server_verify();
  84 static int server_finish();
  85 static int request_certificate();
  86 static int ssl_rsa_private_decrypt();
  87 #endif
  88
  89 #define BREAK   break
  90
  91 static SSL_METHOD *ssl2_get_server_method(ver)
  92 int ver;
  93         {
  94         if (ver == SSL2_VERSION)
  95                 return(SSLv2_server_method());
  96         else
  97                 return(NULL);
  98         }
  99
 100 SSL_METHOD *SSLv2_server_method()
 101         {
 102         static int init=1;
 103         static SSL_METHOD SSLv2_server_data;
 104
 105         if (init)
 106                 {
 107                 init=0;
 108                 memcpy((char *)&SSLv2_server_data,(char *)sslv2_base_method(),
 109                         sizeof(SSL_METHOD));
 110                 SSLv2_server_data.ssl_accept=ssl2_accept;
 111                 SSLv2_server_data.get_ssl_method=ssl2_get_server_method;
 112                 }
 113         return(&SSLv2_server_data);
 114         }
 115
 116 int ssl2_accept(s)
 117 SSL *s;
 118         {
 119         unsigned long l=time(NULL);
 120         BUF_MEM *buf=NULL;
 121         int ret= -1;
 122         long num1;
 123         void (*cb)()=NULL;
 124         int new_state,state;
 125
 126         RAND_seed(&l,sizeof(l));
 127         ERR_clear_error();
 128         clear_sys_error();
 129
 130         if (s->info_callback != NULL)
 131                 cb=s->info_callback;
 132         else if (s->ctx->info_callback != NULL)
 133                 cb=s->ctx->info_callback;
 134
 135         /* init things to blank */
 136         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 137         s->in_handshake++;
 138
 139         if (((s->session == NULL) || (s->session->cert == NULL)) &&
 140                 (s->cert == NULL))
 141                 {
 142                 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 143                 return(-1);
 144                 }
 145
 146         clear_sys_error();
 147         for (;;)
 148                 {
 149                 state=s->state;
 150
 151                 switch (s->state)
 152                         {
 153                 case SSL_ST_BEFORE:
 154                 case SSL_ST_ACCEPT:
 155                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 156                 case SSL_ST_OK|SSL_ST_ACCEPT:
 157
 158                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 159
 160                         s->version=SSL2_VERSION;
 161                         s->type=SSL_ST_ACCEPT;
 162
 163                         buf=s->init_buf;
 164                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 165                                 { ret= -1; goto end; }
 166                         if (!BUF_MEM_grow(buf,(int)
 167                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 168                                 { ret= -1; goto end; }
 169                         s->init_buf=buf;
 170                         s->init_num=0;
 171                         s->ctx->sess_accept++;
 172                         s->handshake_func=ssl2_accept;
 173                         s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 174                         BREAK;
 175
 176                 case SSL2_ST_GET_CLIENT_HELLO_A:
 177                 case SSL2_ST_GET_CLIENT_HELLO_B:
 178                 case SSL2_ST_GET_CLIENT_HELLO_C:
 179                         s->shutdown=0;
 180                         ret=get_client_hello(s);
 181                         if (ret <= 0) goto end;
 182                         s->init_num=0;
 183                         s->state=SSL2_ST_SEND_SERVER_HELLO_A;
 184                         BREAK;
 185
 186                 case SSL2_ST_SEND_SERVER_HELLO_A:
 187                 case SSL2_ST_SEND_SERVER_HELLO_B:
 188                         ret=server_hello(s);
 189                         if (ret <= 0) goto end;
 190                         s->init_num=0;
 191                         if (!s->hit)
 192                                 {
 193                                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
 194                                 BREAK;
 195                                 }
 196                         else
 197                                 {
 198                                 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 199                                 BREAK;
 200                                 }
 201                 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
 202                 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
 203                         ret=get_client_master_key(s);
 204                         if (ret <= 0) goto end;
 205                         s->init_num=0;
 206                         s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 207                         BREAK;
 208
 209                 case SSL2_ST_SERVER_START_ENCRYPTION:
 210                         /* Ok we how have sent all the stuff needed to
 211                          * start encrypting, the next packet back will
 212                          * be encrypted. */
 213                         if (!ssl2_enc_init(s,0))
 214                                 { ret= -1; goto end; }
 215                         s->s2->clear_text=0;
 216                         s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
 217                         BREAK;
 218
 219                 case SSL2_ST_SEND_SERVER_VERIFY_A:
 220                 case SSL2_ST_SEND_SERVER_VERIFY_B:
 221                         ret=server_verify(s);
 222                         if (ret <= 0) goto end;
 223                         s->init_num=0;
 224                         if (s->hit)
 225                                 {
 226                                 /* If we are in here, we have been
 227                                  * buffering the output, so we need to
 228                                  * flush it and remove buffering from
 229                                  * future traffic */
 230                                 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
 231                                 BREAK;
 232                                 }
 233                         else
 234                                 {
 235                                 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 236                                 break;
 237                                 }
 238
 239                 case SSL2_ST_SEND_SERVER_VERIFY_C:
 240                         /* get the number of bytes to write */
 241                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 242                         if (num1 != 0)
 243                                 {
 244                                 s->rwstate=SSL_WRITING;
 245                                 num1=BIO_flush(s->wbio);
 246                                 if (num1 <= 0) { ret= -1; goto end; }
 247                                 s->rwstate=SSL_NOTHING;
 248                                 }
 249
 250                         /* flushed and now remove buffering */
 251                         s->wbio=BIO_pop(s->wbio);
 252
 253                         s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 254                         BREAK;
 255
 256                 case SSL2_ST_GET_CLIENT_FINISHED_A:
 257                 case SSL2_ST_GET_CLIENT_FINISHED_B:
 258                         ret=get_client_finished(s);
 259                         if (ret <= 0)
 260                                 goto end;
 261                         s->init_num=0;
 262                         s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
 263                         BREAK;
 264
 265                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
 266                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
 267                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
 268                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
 269                         /* don't do a 'request certificate' if we
 270                          * don't want to, or we already have one, and
 271                          * we only want to do it once. */
 272                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 273                                 ((s->session->peer != NULL) &&
 274                                 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 275                                 {
 276                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 277                                 break;
 278                                 }
 279                         else
 280                                 {
 281                                 ret=request_certificate(s);
 282                                 if (ret <= 0) goto end;
 283                                 s->init_num=0;
 284                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 285                                 }
 286                         BREAK;
 287
 288                 case SSL2_ST_SEND_SERVER_FINISHED_A:
 289                 case SSL2_ST_SEND_SERVER_FINISHED_B:
 290                         ret=server_finish(s);
 291                         if (ret <= 0) goto end;
 292                         s->init_num=0;
 293                         s->state=SSL_ST_OK;
 294                         break;
 295
 296                 case SSL_ST_OK:
 297                         BUF_MEM_free(s->init_buf);
 298                         s->init_buf=NULL;
 299                         s->init_num=0;
 300                 /*      ERR_clear_error();*/
 301
 302                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 303
 304                         s->ctx->sess_accept_good++;
 305                         /* s->server=1; */
 306                         ret=1;
 307
 308                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 309
 310                         goto end;
 311                         /* BREAK; */
 312
 313                 default:
 314                         SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
 315                         ret= -1;
 316                         goto end;
 317                         /* BREAK; */
 318                         }
 319
 320                 if ((cb != NULL) && (s->state != state))
 321                         {
 322                         new_state=s->state;
 323                         s->state=state;
 324                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 325                         s->state=new_state;
 326                         }
 327                 }
 328 end:
 329         s->in_handshake--;
 330         if (cb != NULL)
 331                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 332         return(ret);
 333         }
 334
 335 static int get_client_master_key(s)
 336 SSL *s;
 337         {
 338         int export,i,n,keya,ek;
 339 #if 0
 340         int error=0;
 341 #endif
 342         unsigned char *p;
 343         SSL_CIPHER *cp;
 344         EVP_CIPHER *c;
 345         EVP_MD *md;
 346
 347         p=(unsigned char *)s->init_buf->data;
 348         if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
 349                 {
 350                 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
 351
 352                 if (i < (10-s->init_num))
 353                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 354                 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
 355                         {
 356                         if (p[-1] != SSL2_MT_ERROR)
 357                                 {
 358                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 359                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
 360                                 }
 361                         else
 362                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
 363                                         SSL_R_PEER_ERROR);
 364                         return(-1);
 365                         }
 366
 367                 cp=ssl2_get_cipher_by_char(p);
 368                 if (cp == NULL)
 369                         {
 370                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 371                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
 372                                 SSL_R_NO_CIPHER_MATCH);
 373                         return(-1);
 374                         }
 375                 s->session->cipher= cp;
 376
 377                 p+=3;
 378                 n2s(p,i); s->s2->tmp.clear=i;
 379                 n2s(p,i); s->s2->tmp.enc=i;
 380                 n2s(p,i); s->session->key_arg_length=i;
 381                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
 382                 s->init_num=0;
 383                 }
 384
 385         /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
 386         p=(unsigned char *)s->init_buf->data;
 387         keya=s->session->key_arg_length;
 388         n=s->s2->tmp.clear+s->s2->tmp.enc+keya - s->init_num;
 389         i=ssl2_read(s,(char *)&(p[s->init_num]),n);
 390         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 391
 392         memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
 393                 (unsigned int)keya);
 394
 395         if (s->session->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
 396                 {
 397                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 398                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
 399                 return(-1);
 400                 }
 401         i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
 402                 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
 403                 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 404
 405         export=(s->session->cipher->algorithms & SSL_EXP)?1:0;
 406
 407         if (!ssl_cipher_get_evp(s->session->cipher,&c,&md))
 408                 {
 409                 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 410                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 411                 return(0);
 412                 }
 413
 414         if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 415                 {
 416                 export=1;
 417                 ek=8;
 418                 }
 419         else
 420                 ek=5;
 421
 422         /* bad decrypt */
 423 #if 1
 424         /* If a bad decrypt, continue with protocol but with a
 425          * dud master secret */
 426         if ((i < 0) ||
 427                 ((!export && (i != EVP_CIPHER_key_length(c)))
 428                 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
 429                         EVP_CIPHER_key_length(c))))))
 430                 {
 431                 if (export)
 432                         i=ek;
 433                 else
 434                         i=EVP_CIPHER_key_length(c);
 435                 RAND_bytes(p,i);
 436                 }
 437 #else
 438         if (i < 0)
 439                 {
 440                 error=1;
 441                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
 442                 }
 443         /* incorrect number of key bytes for non export cipher */
 444         else if ((!export && (i != EVP_CIPHER_key_length(c)))
 445                 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
 446                         EVP_CIPHER_key_length(c)))))
 447                 {
 448                 error=1;
 449                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
 450                 }
 451         if (error)
 452                 {
 453                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 454                 return(-1);
 455                 }
 456 #endif
 457
 458         if (export) i+=s->s2->tmp.clear;
 459         s->session->master_key_length=i;
 460         memcpy(s->session->master_key,p,(unsigned int)i);
 461         return(1);
 462         }
 463
 464 static int get_client_hello(s)
 465 SSL *s;
 466         {
 467         int i,n;
 468         unsigned char *p;
 469         STACK *cs; /* a stack of SSL_CIPHERS */
 470         STACK *cl; /* the ones we want to use */
 471         int z;
 472
 473         /* This is a bit of a hack to check for the correct packet
 474          * type the first time round. */
 475         if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
 476                 {
 477                 s->first_packet=1;
 478                 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
 479                 }
 480
 481         p=(unsigned char *)s->init_buf->data;
 482         if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
 483                 {
 484                 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
 485                 if (i < (9-s->init_num))
 486                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 487
 488                 if (*(p++) != SSL2_MT_CLIENT_HELLO)
 489                         {
 490                         if (p[-1] != SSL2_MT_ERROR)
 491                                 {
 492                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 493                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
 494                                 }
 495                         else
 496                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
 497                         return(-1);
 498                         }
 499                 n2s(p,i);
 500                 if (i < s->version) s->version=i;
 501                 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
 502                 n2s(p,i); s->s2->tmp.session_id_length=i;
 503                 n2s(p,i); s->s2->challenge_length=i;
 504                 if (    (i < SSL2_MIN_CHALLENGE_LENGTH) ||
 505                         (i > SSL2_MAX_CHALLENGE_LENGTH))
 506                         {
 507                         SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
 508                         return(-1);
 509                         }
 510                 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
 511                 s->init_num=0;
 512                 }
 513
 514         /* SSL2_ST_GET_CLIENT_HELLO_C */
 515         p=(unsigned char *)s->init_buf->data;
 516         n=s->s2->tmp.cipher_spec_length+s->s2->challenge_length+
 517                 s->s2->tmp.session_id_length-s->init_num;
 518         i=ssl2_read(s,(char *)&(p[s->init_num]),n);
 519         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 520
 521         /* get session-id before cipher stuff so we can get out session
 522          * structure if it is cached */
 523         /* session-id */
 524         if ((s->s2->tmp.session_id_length != 0) &&
 525                 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
 526                 {
 527                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 528                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
 529                 return(-1);
 530                 }
 531
 532         if (s->s2->tmp.session_id_length == 0)
 533                 {
 534                 if (!ssl_get_new_session(s,1))
 535                         {
 536                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 537                         return(-1);
 538                         }
 539                 }
 540         else
 541                 {
 542                 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
 543                         s->s2->tmp.session_id_length);
 544                 if (i == 1)
 545                         { /* previous session */
 546                         s->hit=1;
 547                         }
 548                 else if (i == -1)
 549                         {
 550                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 551                         return(-1);
 552                         }
 553                 else
 554                         {
 555                         if (s->cert == NULL)
 556                                 {
 557                                 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 558                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
 559                                 return(-1);
 560                                 }
 561
 562                         if (!ssl_get_new_session(s,1))
 563                                 {
 564                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 565                                 return(-1);
 566                                 }
 567                         }
 568                 }
 569
 570         if (!s->hit)
 571                 {
 572                 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
 573                         &s->session->ciphers);
 574                 if (cs == NULL) goto mem_err;
 575
 576                 cl=ssl_get_ciphers_by_id(s);
 577
 578                 for (z=0; z<sk_num(cs); z++)
 579                         {
 580                         if (sk_find(cl,sk_value(cs,z)) < 0)
 581                                 {
 582                                 sk_delete(cs,z);
 583                                 z--;
 584                                 }
 585                         }
 586
 587                 /* s->session->ciphers should now have a list of
 588                  * ciphers that are on both the client and server.
 589                  * This list is ordered by the order the client sent
 590                  * the ciphers.
 591                  */
 592                 }
 593         p+=s->s2->tmp.cipher_spec_length;
 594         /* done cipher selection */
 595
 596         /* session id extracted already */
 597         p+=s->s2->tmp.session_id_length;
 598
 599         /* challenge */
 600         memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
 601         return(1);
 602 mem_err:
 603         SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 604         return(0);
 605         }
 606
 607 static int server_hello(s)
 608 SSL *s;
 609         {
 610         unsigned char *p,*d;
 611         int n,hit;
 612         STACK *sk;
 613
 614         p=(unsigned char *)s->init_buf->data;
 615         if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
 616                 {
 617                 d=p+11;
 618                 *(p++)=SSL2_MT_SERVER_HELLO;            /* type */
 619                 hit=s->hit;
 620                 *(p++)=(unsigned char)hit;
 621                 if (!hit)
 622                         {                       /* else add cert to session */
 623                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 624                         if (s->session->cert != NULL)
 625                                 ssl_cert_free(s->session->cert);
 626                         s->session->cert=s->cert;
 627                         }
 628                 else    /* We have a session id-cache hit, if the
 629                          * session-id has no certificate listed against
 630                          * the 'cert' structure, grab the 'old' one
 631                          * listed against the SSL connection */
 632                         {
 633                         if (s->session->cert == NULL)
 634                                 {
 635                                 CRYPTO_add(&s->cert->references,1,
 636                                         CRYPTO_LOCK_SSL_CERT);
 637                                 s->session->cert=s->cert;
 638                                 }
 639                         }
 640
 641                 if (s->session->cert == NULL)
 642                         {
 643                         ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 644                         SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
 645                         return(-1);
 646                         }
 647
 648                 if (hit)
 649                         {
 650                         *(p++)=0;               /* no certificate type */
 651                         s2n(s->version,p);      /* version */
 652                         s2n(0,p);               /* cert len */
 653                         s2n(0,p);               /* ciphers len */
 654                         }
 655                 else
 656                         {
 657                         /* EAY EAY */
 658                         /* put certificate type */
 659                         *(p++)=SSL2_CT_X509_CERTIFICATE;
 660                         s2n(s->version,p);      /* version */
 661                         n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 662                         s2n(n,p);               /* certificate length */
 663                         i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
 664                         n=0;
 665
 666                         /* lets send out the ciphers we like in the
 667                          * prefered order */
 668                         sk= s->session->ciphers;
 669                         n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d);
 670                         d+=n;
 671                         s2n(n,p);               /* add cipher length */
 672                         }
 673
 674                 /* make and send conn_id */
 675                 s2n(SSL2_CONNECTION_ID_LENGTH,p);       /* add conn_id length */
 676                 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
 677                 RAND_bytes(s->s2->conn_id,(int)s->s2->conn_id_length);
 678                 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
 679                 d+=SSL2_CONNECTION_ID_LENGTH;
 680
 681                 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
 682                 s->init_num=d-(unsigned char *)s->init_buf->data;
 683                 s->init_off=0;
 684                 }
 685         /* SSL2_ST_SEND_SERVER_HELLO_B */
 686         /* If we are using TCP/IP, the performace is bad if we do 2
 687          * writes without a read between them.  This occurs when
 688          * Session-id reuse is used, so I will put in a buffering module
 689          */
 690         if (s->hit)
 691                 {
 692                 if (!ssl_init_wbio_buffer(s,1)) return(-1);
 693                 }
 694
 695         return(ssl2_do_write(s));
 696         }
 697
 698 static int get_client_finished(s)
 699 SSL *s;
 700         {
 701         unsigned char *p;
 702         int i;
 703
 704         p=(unsigned char *)s->init_buf->data;
 705         if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
 706                 {
 707                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 708                 if (i < 1-s->init_num)
 709                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 710
 711                 if (*p != SSL2_MT_CLIENT_FINISHED)
 712                         {
 713                         if (*p != SSL2_MT_ERROR)
 714                                 {
 715                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 716                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 717                                 }
 718                         else
 719                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
 720                         return(-1);
 721                         }
 722                 s->init_num=0;
 723                 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
 724                 }
 725
 726         /* SSL2_ST_GET_CLIENT_FINISHED_B */
 727         i=ssl2_read(s,(char *)&(p[s->init_num]),s->s2->conn_id_length-s->init_num);
 728         if (i < (int)s->s2->conn_id_length-s->init_num)
 729                 {
 730                 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 731                 }
 732         if (memcmp(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length) != 0)
 733                 {
 734                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 735                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
 736                 return(-1);
 737                 }
 738         return(1);
 739         }
 740
 741 static int server_verify(s)
 742 SSL *s;
 743         {
 744         unsigned char *p;
 745
 746         if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
 747                 {
 748                 p=(unsigned char *)s->init_buf->data;
 749                 *(p++)=SSL2_MT_SERVER_VERIFY;
 750                 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
 751                 /* p+=s->s2->challenge_length; */
 752
 753                 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
 754                 s->init_num=s->s2->challenge_length+1;
 755                 s->init_off=0;
 756                 }
 757         return(ssl2_do_write(s));
 758         }
 759
 760 static int server_finish(s)
 761 SSL *s;
 762         {
 763         unsigned char *p;
 764
 765         if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
 766                 {
 767                 p=(unsigned char *)s->init_buf->data;
 768                 *(p++)=SSL2_MT_SERVER_FINISHED;
 769
 770                 memcpy(p,s->session->session_id,
 771                         (unsigned int)s->session->session_id_length);
 772                 /* p+=s->session->session_id_length; */
 773
 774                 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
 775                 s->init_num=s->session->session_id_length+1;
 776                 s->init_off=0;
 777                 }
 778
 779         /* SSL2_ST_SEND_SERVER_FINISHED_B */
 780         return(ssl2_do_write(s));
 781         }
 782
 783 /* send the request and check the response */
 784 static int request_certificate(s)
 785 SSL *s;
 786         {
 787         unsigned char *p,*p2,*buf2;
 788         unsigned char *ccd;
 789         int i,j,ctype,ret= -1;
 790         X509 *x509=NULL;
 791         STACK *sk=NULL;
 792
 793         ccd=s->s2->tmp.ccl;
 794         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
 795                 {
 796                 p=(unsigned char *)s->init_buf->data;
 797                 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
 798                 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
 799                 RAND_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 800                 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 801
 802                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
 803                 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
 804                 s->init_off=0;
 805                 }
 806
 807         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
 808                 {
 809                 i=ssl2_do_write(s);
 810                 if (i <= 0)
 811                         {
 812                         ret=i;
 813                         goto end;
 814                         }
 815
 816                 s->init_num=0;
 817                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
 818                 }
 819
 820         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
 821                 {
 822                 p=(unsigned char *)s->init_buf->data;
 823                 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num);
 824                 if (i < 3)
 825                         {
 826                         ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 827                         goto end;
 828                         }
 829
 830                 if ((*p == SSL2_MT_ERROR) && (i >= 3))
 831                         {
 832                         n2s(p,i);
 833                         if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
 834                                 {
 835                                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 836                                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
 837                                 goto end;
 838                                 }
 839                         ret=1;
 840                         goto end;
 841                         }
 842                 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (i < 6))
 843                         {
 844                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 845                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
 846                         goto end;
 847                         }
 848                 /* ok we have a response */
 849                 /* certificate type, there is only one right now. */
 850                 ctype= *(p++);
 851                 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 852                         {
 853                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 854                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
 855                         goto end;
 856                         }
 857                 n2s(p,i); s->s2->tmp.clen=i;
 858                 n2s(p,i); s->s2->tmp.rlen=i;
 859                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
 860                 s->init_num=0;
 861                 }
 862
 863         /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
 864         p=(unsigned char *)s->init_buf->data;
 865         j=s->s2->tmp.clen+s->s2->tmp.rlen-s->init_num;
 866         i=ssl2_read(s,(char *)&(p[s->init_num]),j);
 867         if (i < j)
 868                 {
 869                 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 870                 goto end;
 871                 }
 872
 873         x509=(X509 *)d2i_X509(NULL,&p,(long)s->s2->tmp.clen);
 874         if (x509 == NULL)
 875                 {
 876                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
 877                 goto msg_end;
 878                 }
 879
 880         if (((sk=sk_new_null()) == NULL) || (!sk_push(sk,(char *)x509)))
 881                 {
 882                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 883                 goto msg_end;
 884                 }
 885
 886         i=ssl_verify_cert_chain(s,sk);
 887
 888         if (i)  /* we like the packet, now check the chksum */
 889                 {
 890                 EVP_MD_CTX ctx;
 891                 EVP_PKEY *pkey=NULL;
 892
 893                 EVP_VerifyInit(&ctx,s->ctx->rsa_md5);
 894                 EVP_VerifyUpdate(&ctx,s->s2->key_material,
 895                         (unsigned int)s->s2->key_material_length);
 896                 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 897
 898                 i=i2d_X509(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 899                 buf2=(unsigned char *)Malloc((unsigned int)i);
 900                 if (buf2 == NULL)
 901                         {
 902                         SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 903                         goto msg_end;
 904                         }
 905                 p2=buf2;
 906                 i=i2d_X509(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
 907                 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
 908                 Free(buf2);
 909
 910                 pkey=X509_get_pubkey(x509);
 911                 if (pkey == NULL) goto end;
 912                 i=EVP_VerifyFinal(&ctx,p,s->s2->tmp.rlen,pkey);
 913                 memset(&ctx,0,sizeof(ctx));
 914
 915                 if (i)
 916                         {
 917                         if (s->session->peer != NULL)
 918                                 X509_free(s->session->peer);
 919                         s->session->peer=x509;
 920                         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
 921                         ret=1;
 922                         goto end;
 923                         }
 924                 else
 925                         {
 926                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
 927                         goto msg_end;
 928                         }
 929                 }
 930         else
 931                 {
 932 msg_end:
 933                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 934                 }
 935 end:
 936         if (sk != NULL) sk_free(sk);
 937         if (x509 != NULL) X509_free(x509);
 938         return(ret);
 939         }
 940
 941 static int ssl_rsa_private_decrypt(c, len, from, to,padding)
 942 CERT *c;
 943 int len;
 944 unsigned char *from;
 945 unsigned char *to;
 946 int padding;
 947         {
 948         RSA *rsa;
 949         int i;
 950
 951         if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
 952                 {
 953                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
 954                 return(-1);
 955                 }
 956         if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
 957                 {
 958                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 959                 return(-1);
 960                 }
 961         rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
 962
 963         /* we have the public key */
 964         i=RSA_private_decrypt(len,from,to,rsa,padding);
 965         if (i < 0)
 966                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
 967         return(i);
 968         }
 969