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 <openssl/bio.h>
  61 #include <openssl/rand.h>
  62 #include <openssl/objects.h>
  63 #include "ssl_locl.h"
  64 #include <openssl/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(int ver)
  92         {
  93         if (ver == SSL2_VERSION)
  94                 return(SSLv2_server_method());
  95         else
  96                 return(NULL);
  97         }
  98
  99 SSL_METHOD *SSLv2_server_method(void)
 100         {
 101         static int init=1;
 102         static SSL_METHOD SSLv2_server_data;
 103
 104         if (init)
 105                 {
 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                 init=0;
 111                 }
 112         return(&SSLv2_server_data);
 113         }
 114
 115 int ssl2_accept(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(&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                         s->server=1;
 157                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 158
 159                         s->version=SSL2_VERSION;
 160                         s->type=SSL_ST_ACCEPT;
 161
 162                         buf=s->init_buf;
 163                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
 164                                 { ret= -1; goto end; }
 165                         if (!BUF_MEM_grow(buf,(int)
 166                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 167                                 { ret= -1; goto end; }
 168                         s->init_buf=buf;
 169                         s->init_num=0;
 170                         s->ctx->stats.sess_accept++;
 171                         s->handshake_func=ssl2_accept;
 172                         s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 173                         BREAK;
 174
 175                 case SSL2_ST_GET_CLIENT_HELLO_A:
 176                 case SSL2_ST_GET_CLIENT_HELLO_B:
 177                 case SSL2_ST_GET_CLIENT_HELLO_C:
 178                         s->shutdown=0;
 179                         ret=get_client_hello(s);
 180                         if (ret <= 0) goto end;
 181                         s->init_num=0;
 182                         s->state=SSL2_ST_SEND_SERVER_HELLO_A;
 183                         BREAK;
 184
 185                 case SSL2_ST_SEND_SERVER_HELLO_A:
 186                 case SSL2_ST_SEND_SERVER_HELLO_B:
 187                         ret=server_hello(s);
 188                         if (ret <= 0) goto end;
 189                         s->init_num=0;
 190                         if (!s->hit)
 191                                 {
 192                                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
 193                                 BREAK;
 194                                 }
 195                         else
 196                                 {
 197                                 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 198                                 BREAK;
 199                                 }
 200                 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
 201                 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
 202                         ret=get_client_master_key(s);
 203                         if (ret <= 0) goto end;
 204                         s->init_num=0;
 205                         s->state=SSL2_ST_SERVER_START_ENCRYPTION;
 206                         BREAK;
 207
 208                 case SSL2_ST_SERVER_START_ENCRYPTION:
 209                         /* Ok we how have sent all the stuff needed to
 210                          * start encrypting, the next packet back will
 211                          * be encrypted. */
 212                         if (!ssl2_enc_init(s,0))
 213                                 { ret= -1; goto end; }
 214                         s->s2->clear_text=0;
 215                         s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
 216                         BREAK;
 217
 218                 case SSL2_ST_SEND_SERVER_VERIFY_A:
 219                 case SSL2_ST_SEND_SERVER_VERIFY_B:
 220                         ret=server_verify(s);
 221                         if (ret <= 0) goto end;
 222                         s->init_num=0;
 223                         if (s->hit)
 224                                 {
 225                                 /* If we are in here, we have been
 226                                  * buffering the output, so we need to
 227                                  * flush it and remove buffering from
 228                                  * future traffic */
 229                                 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
 230                                 BREAK;
 231                                 }
 232                         else
 233                                 {
 234                                 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 235                                 break;
 236                                 }
 237
 238                 case SSL2_ST_SEND_SERVER_VERIFY_C:
 239                         /* get the number of bytes to write */
 240                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 241                         if (num1 != 0)
 242                                 {
 243                                 s->rwstate=SSL_WRITING;
 244                                 num1=BIO_flush(s->wbio);
 245                                 if (num1 <= 0) { ret= -1; goto end; }
 246                                 s->rwstate=SSL_NOTHING;
 247                                 }
 248
 249                         /* flushed and now remove buffering */
 250                         s->wbio=BIO_pop(s->wbio);
 251
 252                         s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
 253                         BREAK;
 254
 255                 case SSL2_ST_GET_CLIENT_FINISHED_A:
 256                 case SSL2_ST_GET_CLIENT_FINISHED_B:
 257                         ret=get_client_finished(s);
 258                         if (ret <= 0)
 259                                 goto end;
 260                         s->init_num=0;
 261                         s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
 262                         BREAK;
 263
 264                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
 265                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
 266                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
 267                 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
 268                         /* don't do a 'request certificate' if we
 269                          * don't want to, or we already have one, and
 270                          * we only want to do it once. */
 271                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 272                                 ((s->session->peer != NULL) &&
 273                                 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 274                                 {
 275                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 276                                 break;
 277                                 }
 278                         else
 279                                 {
 280                                 ret=request_certificate(s);
 281                                 if (ret <= 0) goto end;
 282                                 s->init_num=0;
 283                                 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
 284                                 }
 285                         BREAK;
 286
 287                 case SSL2_ST_SEND_SERVER_FINISHED_A:
 288                 case SSL2_ST_SEND_SERVER_FINISHED_B:
 289                         ret=server_finish(s);
 290                         if (ret <= 0) goto end;
 291                         s->init_num=0;
 292                         s->state=SSL_ST_OK;
 293                         break;
 294
 295                 case SSL_ST_OK:
 296                         BUF_MEM_free(s->init_buf);
 297                         ssl_free_wbio_buffer(s);
 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->stats.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(SSL *s)
 336         {
 337         int export,i,n,keya,ek;
 338         unsigned char *p;
 339         SSL_CIPHER *cp;
 340         const EVP_CIPHER *c;
 341         const EVP_MD *md;
 342
 343         p=(unsigned char *)s->init_buf->data;
 344         if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
 345                 {
 346                 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
 347
 348                 if (i < (10-s->init_num))
 349                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 350                 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
 351                         {
 352                         if (p[-1] != SSL2_MT_ERROR)
 353                                 {
 354                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 355                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
 356                                 }
 357                         else
 358                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
 359                                         SSL_R_PEER_ERROR);
 360                         return(-1);
 361                         }
 362
 363                 cp=ssl2_get_cipher_by_char(p);
 364                 if (cp == NULL)
 365                         {
 366                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 367                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
 368                                 SSL_R_NO_CIPHER_MATCH);
 369                         return(-1);
 370                         }
 371                 s->session->cipher= cp;
 372
 373                 p+=3;
 374                 n2s(p,i); s->s2->tmp.clear=i;
 375                 n2s(p,i); s->s2->tmp.enc=i;
 376                 n2s(p,i); s->session->key_arg_length=i;
 377                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
 378                 s->init_num=0;
 379                 }
 380
 381         /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
 382         p=(unsigned char *)s->init_buf->data;
 383         keya=s->session->key_arg_length;
 384         n=s->s2->tmp.clear+s->s2->tmp.enc+keya - s->init_num;
 385         i=ssl2_read(s,(char *)&(p[s->init_num]),n);
 386         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 387
 388         memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
 389                 (unsigned int)keya);
 390
 391         if (s->session->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
 392                 {
 393                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 394                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
 395                 return(-1);
 396                 }
 397         i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
 398                 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
 399                 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 400
 401         export=SSL_C_IS_EXPORT(s->session->cipher);
 402
 403         if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
 404                 {
 405                 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 406                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 407                 return(0);
 408                 }
 409
 410         if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 411                 {
 412                 export=1;
 413                 ek=8;
 414                 }
 415         else
 416                 ek=5;
 417
 418         /* bad decrypt */
 419 #if 1
 420         /* If a bad decrypt, continue with protocol but with a
 421          * dud master secret */
 422         if ((i < 0) ||
 423                 ((!export && (i != EVP_CIPHER_key_length(c)))
 424                 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
 425                         EVP_CIPHER_key_length(c))))))
 426                 {
 427                 if (export)
 428                         i=ek;
 429                 else
 430                         i=EVP_CIPHER_key_length(c);
 431                 RAND_bytes(p,i);
 432                 }
 433 #else
 434         if (i < 0)
 435                 {
 436                 error=1;
 437                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
 438                 }
 439         /* incorrect number of key bytes for non export cipher */
 440         else if ((!export && (i != EVP_CIPHER_key_length(c)))
 441                 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
 442                         EVP_CIPHER_key_length(c)))))
 443                 {
 444                 error=1;
 445                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
 446                 }
 447         if (error)
 448                 {
 449                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 450                 return(-1);
 451                 }
 452 #endif
 453
 454         if (export) i+=s->s2->tmp.clear;
 455         s->session->master_key_length=i;
 456         memcpy(s->session->master_key,p,(unsigned int)i);
 457         return(1);
 458         }
 459
 460 static int get_client_hello(SSL *s)
 461         {
 462         int i,n;
 463         unsigned char *p;
 464         STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
 465         STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
 466         int z;
 467
 468         /* This is a bit of a hack to check for the correct packet
 469          * type the first time round. */
 470         if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
 471                 {
 472                 s->first_packet=1;
 473                 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
 474                 }
 475
 476         p=(unsigned char *)s->init_buf->data;
 477         if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
 478                 {
 479                 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
 480                 if (i < (9-s->init_num))
 481                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 482
 483                 if (*(p++) != SSL2_MT_CLIENT_HELLO)
 484                         {
 485                         if (p[-1] != SSL2_MT_ERROR)
 486                                 {
 487                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 488                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
 489                                 }
 490                         else
 491                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
 492                         return(-1);
 493                         }
 494                 n2s(p,i);
 495                 if (i < s->version) s->version=i;
 496                 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
 497                 n2s(p,i); s->s2->tmp.session_id_length=i;
 498                 n2s(p,i); s->s2->challenge_length=i;
 499                 if (    (i < SSL2_MIN_CHALLENGE_LENGTH) ||
 500                         (i > SSL2_MAX_CHALLENGE_LENGTH))
 501                         {
 502                         SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
 503                         return(-1);
 504                         }
 505                 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
 506                 s->init_num=0;
 507                 }
 508
 509         /* SSL2_ST_GET_CLIENT_HELLO_C */
 510         p=(unsigned char *)s->init_buf->data;
 511         n=s->s2->tmp.cipher_spec_length+s->s2->challenge_length+
 512                 s->s2->tmp.session_id_length-s->init_num;
 513         i=ssl2_read(s,(char *)&(p[s->init_num]),n);
 514         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 515
 516         /* get session-id before cipher stuff so we can get out session
 517          * structure if it is cached */
 518         /* session-id */
 519         if ((s->s2->tmp.session_id_length != 0) &&
 520                 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
 521                 {
 522                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 523                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
 524                 return(-1);
 525                 }
 526
 527         if (s->s2->tmp.session_id_length == 0)
 528                 {
 529                 if (!ssl_get_new_session(s,1))
 530                         {
 531                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 532                         return(-1);
 533                         }
 534                 }
 535         else
 536                 {
 537                 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
 538                         s->s2->tmp.session_id_length);
 539                 if (i == 1)
 540                         { /* previous session */
 541                         s->hit=1;
 542                         }
 543                 else if (i == -1)
 544                         {
 545                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 546                         return(-1);
 547                         }
 548                 else
 549                         {
 550                         if (s->cert == NULL)
 551                                 {
 552                                 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 553                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
 554                                 return(-1);
 555                                 }
 556
 557                         if (!ssl_get_new_session(s,1))
 558                                 {
 559                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 560                                 return(-1);
 561                                 }
 562                         }
 563                 }
 564
 565         if (!s->hit)
 566                 {
 567                 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
 568                         &s->session->ciphers);
 569                 if (cs == NULL) goto mem_err;
 570
 571                 cl=ssl_get_ciphers_by_id(s);
 572
 573                 for (z=0; z<sk_SSL_CIPHER_num(cs); z++)
 574                         {
 575                         if (sk_SSL_CIPHER_find(cl,sk_SSL_CIPHER_value(cs,z)) < 0)
 576                                 {
 577                                 sk_SSL_CIPHER_delete(cs,z);
 578                                 z--;
 579                                 }
 580                         }
 581
 582                 /* s->session->ciphers should now have a list of
 583                  * ciphers that are on both the client and server.
 584                  * This list is ordered by the order the client sent
 585                  * the ciphers.
 586                  */
 587                 }
 588         p+=s->s2->tmp.cipher_spec_length;
 589         /* done cipher selection */
 590
 591         /* session id extracted already */
 592         p+=s->s2->tmp.session_id_length;
 593
 594         /* challenge */
 595         memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
 596         return(1);
 597 mem_err:
 598         SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 599         return(0);
 600         }
 601
 602 static int server_hello(SSL *s)
 603         {
 604         unsigned char *p,*d;
 605         int n,hit;
 606         STACK_OF(SSL_CIPHER) *sk;
 607
 608         p=(unsigned char *)s->init_buf->data;
 609         if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
 610                 {
 611                 d=p+11;
 612                 *(p++)=SSL2_MT_SERVER_HELLO;            /* type */
 613                 hit=s->hit;
 614                 *(p++)=(unsigned char)hit;
 615                 if (!hit)
 616                         {                       /* else add cert to session */
 617                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 618                         if (s->session->cert != NULL)
 619                                 ssl_cert_free(s->session->cert);
 620                         s->session->cert=s->cert;
 621                         }
 622                 else    /* We have a session id-cache hit, if the
 623                          * session-id has no certificate listed against
 624                          * the 'cert' structure, grab the 'old' one
 625                          * listed against the SSL connection */
 626                         {
 627                         if (s->session->cert == NULL)
 628                                 {
 629                                 CRYPTO_add(&s->cert->references,1,
 630                                         CRYPTO_LOCK_SSL_CERT);
 631                                 s->session->cert=s->cert;
 632                                 }
 633                         }
 634
 635                 if (s->session->cert == NULL)
 636                         {
 637                         ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 638                         SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
 639                         return(-1);
 640                         }
 641
 642                 if (hit)
 643                         {
 644                         *(p++)=0;               /* no certificate type */
 645                         s2n(s->version,p);      /* version */
 646                         s2n(0,p);               /* cert len */
 647                         s2n(0,p);               /* ciphers len */
 648                         }
 649                 else
 650                         {
 651                         /* EAY EAY */
 652                         /* put certificate type */
 653                         *(p++)=SSL2_CT_X509_CERTIFICATE;
 654                         s2n(s->version,p);      /* version */
 655                         n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 656                         s2n(n,p);               /* certificate length */
 657                         i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
 658                         n=0;
 659
 660                         /* lets send out the ciphers we like in the
 661                          * prefered order */
 662                         sk= s->session->ciphers;
 663                         n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d);
 664                         d+=n;
 665                         s2n(n,p);               /* add cipher length */
 666                         }
 667
 668                 /* make and send conn_id */
 669                 s2n(SSL2_CONNECTION_ID_LENGTH,p);       /* add conn_id length */
 670                 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
 671                 RAND_bytes(s->s2->conn_id,(int)s->s2->conn_id_length);
 672                 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
 673                 d+=SSL2_CONNECTION_ID_LENGTH;
 674
 675                 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
 676                 s->init_num=d-(unsigned char *)s->init_buf->data;
 677                 s->init_off=0;
 678                 }
 679         /* SSL2_ST_SEND_SERVER_HELLO_B */
 680         /* If we are using TCP/IP, the performace is bad if we do 2
 681          * writes without a read between them.  This occurs when
 682          * Session-id reuse is used, so I will put in a buffering module
 683          */
 684         if (s->hit)
 685                 {
 686                 if (!ssl_init_wbio_buffer(s,1)) return(-1);
 687                 }
 688
 689         return(ssl2_do_write(s));
 690         }
 691
 692 static int get_client_finished(SSL *s)
 693         {
 694         unsigned char *p;
 695         int i;
 696
 697         p=(unsigned char *)s->init_buf->data;
 698         if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
 699                 {
 700                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 701                 if (i < 1-s->init_num)
 702                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 703
 704                 if (*p != SSL2_MT_CLIENT_FINISHED)
 705                         {
 706                         if (*p != SSL2_MT_ERROR)
 707                                 {
 708                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 709                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 710                                 }
 711                         else
 712                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
 713                         return(-1);
 714                         }
 715                 s->init_num=0;
 716                 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
 717                 }
 718
 719         /* SSL2_ST_GET_CLIENT_FINISHED_B */
 720         i=ssl2_read(s,(char *)&(p[s->init_num]),s->s2->conn_id_length-s->init_num);
 721         if (i < (int)s->s2->conn_id_length-s->init_num)
 722                 {
 723                 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 724                 }
 725         if (memcmp(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length) != 0)
 726                 {
 727                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 728                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
 729                 return(-1);
 730                 }
 731         return(1);
 732         }
 733
 734 static int server_verify(SSL *s)
 735         {
 736         unsigned char *p;
 737
 738         if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
 739                 {
 740                 p=(unsigned char *)s->init_buf->data;
 741                 *(p++)=SSL2_MT_SERVER_VERIFY;
 742                 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
 743                 /* p+=s->s2->challenge_length; */
 744
 745                 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
 746                 s->init_num=s->s2->challenge_length+1;
 747                 s->init_off=0;
 748                 }
 749         return(ssl2_do_write(s));
 750         }
 751
 752 static int server_finish(SSL *s)
 753         {
 754         unsigned char *p;
 755
 756         if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
 757                 {
 758                 p=(unsigned char *)s->init_buf->data;
 759                 *(p++)=SSL2_MT_SERVER_FINISHED;
 760
 761                 memcpy(p,s->session->session_id,
 762                         (unsigned int)s->session->session_id_length);
 763                 /* p+=s->session->session_id_length; */
 764
 765                 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
 766                 s->init_num=s->session->session_id_length+1;
 767                 s->init_off=0;
 768                 }
 769
 770         /* SSL2_ST_SEND_SERVER_FINISHED_B */
 771         return(ssl2_do_write(s));
 772         }
 773
 774 /* send the request and check the response */
 775 static int request_certificate(SSL *s)
 776         {
 777         unsigned char *p,*p2,*buf2;
 778         unsigned char *ccd;
 779         int i,j,ctype,ret= -1;
 780         X509 *x509=NULL;
 781         STACK_OF(X509) *sk=NULL;
 782
 783         ccd=s->s2->tmp.ccl;
 784         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
 785                 {
 786                 p=(unsigned char *)s->init_buf->data;
 787                 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
 788                 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
 789                 RAND_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 790                 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 791
 792                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
 793                 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
 794                 s->init_off=0;
 795                 }
 796
 797         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
 798                 {
 799                 i=ssl2_do_write(s);
 800                 if (i <= 0)
 801                         {
 802                         ret=i;
 803                         goto end;
 804                         }
 805
 806                 s->init_num=0;
 807                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
 808                 }
 809
 810         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
 811                 {
 812                 p=(unsigned char *)s->init_buf->data;
 813                 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num);
 814                 if (i < 3)
 815                         {
 816                         ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 817                         goto end;
 818                         }
 819
 820                 if ((*p == SSL2_MT_ERROR) && (i >= 3))
 821                         {
 822                         n2s(p,i);
 823                         if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
 824                                 {
 825                                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 826                                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
 827                                 goto end;
 828                                 }
 829                         ret=1;
 830                         goto end;
 831                         }
 832                 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (i < 6))
 833                         {
 834                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 835                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
 836                         goto end;
 837                         }
 838                 /* ok we have a response */
 839                 /* certificate type, there is only one right now. */
 840                 ctype= *(p++);
 841                 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 842                         {
 843                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 844                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
 845                         goto end;
 846                         }
 847                 n2s(p,i); s->s2->tmp.clen=i;
 848                 n2s(p,i); s->s2->tmp.rlen=i;
 849                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
 850                 s->init_num=0;
 851                 }
 852
 853         /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
 854         p=(unsigned char *)s->init_buf->data;
 855         j=s->s2->tmp.clen+s->s2->tmp.rlen-s->init_num;
 856         i=ssl2_read(s,(char *)&(p[s->init_num]),j);
 857         if (i < j)
 858                 {
 859                 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 860                 goto end;
 861                 }
 862
 863         x509=(X509 *)d2i_X509(NULL,&p,(long)s->s2->tmp.clen);
 864         if (x509 == NULL)
 865                 {
 866                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
 867                 goto msg_end;
 868                 }
 869
 870         if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
 871                 {
 872                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 873                 goto msg_end;
 874                 }
 875
 876         i=ssl_verify_cert_chain(s,sk);
 877
 878         if (i)  /* we like the packet, now check the chksum */
 879                 {
 880                 EVP_MD_CTX ctx;
 881                 EVP_PKEY *pkey=NULL;
 882
 883                 EVP_VerifyInit(&ctx,s->ctx->rsa_md5);
 884                 EVP_VerifyUpdate(&ctx,s->s2->key_material,
 885                         (unsigned int)s->s2->key_material_length);
 886                 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 887
 888                 i=i2d_X509(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 889                 buf2=(unsigned char *)Malloc((unsigned int)i);
 890                 if (buf2 == NULL)
 891                         {
 892                         SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 893                         goto msg_end;
 894                         }
 895                 p2=buf2;
 896                 i=i2d_X509(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
 897                 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
 898                 Free(buf2);
 899
 900                 pkey=X509_get_pubkey(x509);
 901                 if (pkey == NULL) goto end;
 902                 i=EVP_VerifyFinal(&ctx,p,s->s2->tmp.rlen,pkey);
 903                 EVP_PKEY_free(pkey);
 904                 memset(&ctx,0,sizeof(ctx));
 905
 906                 if (i)
 907                         {
 908                         if (s->session->peer != NULL)
 909                                 X509_free(s->session->peer);
 910                         s->session->peer=x509;
 911                         CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
 912                         ret=1;
 913                         goto end;
 914                         }
 915                 else
 916                         {
 917                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
 918                         goto msg_end;
 919                         }
 920                 }
 921         else
 922                 {
 923 msg_end:
 924                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 925                 }
 926 end:
 927         sk_X509_free(sk);
 928         X509_free(x509);
 929         return(ret);
 930         }
 931
 932 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
 933              unsigned char *to, int padding)
 934         {
 935         RSA *rsa;
 936         int i;
 937
 938         if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
 939                 {
 940                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
 941                 return(-1);
 942                 }
 943         if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
 944                 {
 945                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
 946                 return(-1);
 947                 }
 948         rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
 949
 950         /* we have the public key */
 951         i=RSA_private_decrypt(len,from,to,rsa,padding);
 952         if (i < 0)
 953                 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
 954         return(i);
 955         }
 956