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                         s->server=1;
 159                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 160
 161                         s->version=SSL2_VERSION;
 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->stats.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                         ssl_free_wbio_buffer(s);
 300                         s->init_buf=NULL;
 301                         s->init_num=0;
 302                 /*      ERR_clear_error();*/
 303
 304                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 305
 306                         s->ctx->stats.sess_accept_good++;
 307                         /* s->server=1; */
 308                         ret=1;
 309
 310                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 311
 312                         goto end;
 313                         /* BREAK; */
 314
 315                 default:
 316                         SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
 317                         ret= -1;
 318                         goto end;
 319                         /* BREAK; */
 320                         }
 321
 322                 if ((cb != NULL) && (s->state != state))
 323                         {
 324                         new_state=s->state;
 325                         s->state=state;
 326                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 327                         s->state=new_state;
 328                         }
 329                 }
 330 end:
 331         s->in_handshake--;
 332         if (cb != NULL)
 333                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 334         return(ret);
 335         }
 336
 337 static int get_client_master_key(s)
 338 SSL *s;
 339         {
 340         int export,i,n,keya,ek;
 341         unsigned char *p;
 342         SSL_CIPHER *cp;
 343         EVP_CIPHER *c;
 344         EVP_MD *md;
 345
 346         p=(unsigned char *)s->init_buf->data;
 347         if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
 348                 {
 349                 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
 350
 351                 if (i < (10-s->init_num))
 352                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 353                 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
 354                         {
 355                         if (p[-1] != SSL2_MT_ERROR)
 356                                 {
 357                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 358                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
 359                                 }
 360                         else
 361                                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
 362                                         SSL_R_PEER_ERROR);
 363                         return(-1);
 364                         }
 365
 366                 cp=ssl2_get_cipher_by_char(p);
 367                 if (cp == NULL)
 368                         {
 369                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 370                         SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
 371                                 SSL_R_NO_CIPHER_MATCH);
 372                         return(-1);
 373                         }
 374                 s->session->cipher= cp;
 375
 376                 p+=3;
 377                 n2s(p,i); s->s2->tmp.clear=i;
 378                 n2s(p,i); s->s2->tmp.enc=i;
 379                 n2s(p,i); s->session->key_arg_length=i;
 380                 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
 381                 s->init_num=0;
 382                 }
 383
 384         /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
 385         p=(unsigned char *)s->init_buf->data;
 386         keya=s->session->key_arg_length;
 387         n=s->s2->tmp.clear+s->s2->tmp.enc+keya - s->init_num;
 388         i=ssl2_read(s,(char *)&(p[s->init_num]),n);
 389         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
 390
 391         memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
 392                 (unsigned int)keya);
 393
 394         if (s->session->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
 395                 {
 396                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 397                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
 398                 return(-1);
 399                 }
 400         i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
 401                 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
 402                 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
 403
 404         export=SSL_C_IS_EXPORT(s->session->cipher);
 405
 406         if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
 407                 {
 408                 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
 409                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
 410                 return(0);
 411                 }
 412
 413         if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
 414                 {
 415                 export=1;
 416                 ek=8;
 417                 }
 418         else
 419                 ek=5;
 420
 421         /* bad decrypt */
 422 #if 1
 423         /* If a bad decrypt, continue with protocol but with a
 424          * dud master secret */
 425         if ((i < 0) ||
 426                 ((!export && (i != EVP_CIPHER_key_length(c)))
 427                 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
 428                         EVP_CIPHER_key_length(c))))))
 429                 {
 430                 if (export)
 431                         i=ek;
 432                 else
 433                         i=EVP_CIPHER_key_length(c);
 434                 RAND_bytes(p,i);
 435                 }
 436 #else
 437         if (i < 0)
 438                 {
 439                 error=1;
 440                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
 441                 }
 442         /* incorrect number of key bytes for non export cipher */
 443         else if ((!export && (i != EVP_CIPHER_key_length(c)))
 444                 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
 445                         EVP_CIPHER_key_length(c)))))
 446                 {
 447                 error=1;
 448                 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
 449                 }
 450         if (error)
 451                 {
 452                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 453                 return(-1);
 454                 }
 455 #endif
 456
 457         if (export) i+=s->s2->tmp.clear;
 458         s->session->master_key_length=i;
 459         memcpy(s->session->master_key,p,(unsigned int)i);
 460         return(1);
 461         }
 462
 463 static int get_client_hello(s)
 464 SSL *s;
 465         {
 466         int i,n;
 467         unsigned char *p;
 468         STACK *cs; /* a stack of SSL_CIPHERS */
 469         STACK *cl; /* the ones we want to use */
 470         int z;
 471
 472         /* This is a bit of a hack to check for the correct packet
 473          * type the first time round. */
 474         if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
 475                 {
 476                 s->first_packet=1;
 477                 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
 478                 }
 479
 480         p=(unsigned char *)s->init_buf->data;
 481         if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
 482                 {
 483                 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
 484                 if (i < (9-s->init_num))
 485                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 486
 487                 if (*(p++) != SSL2_MT_CLIENT_HELLO)
 488                         {
 489                         if (p[-1] != SSL2_MT_ERROR)
 490                                 {
 491                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 492                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
 493                                 }
 494                         else
 495                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
 496                         return(-1);
 497                         }
 498                 n2s(p,i);
 499                 if (i < s->version) s->version=i;
 500                 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
 501                 n2s(p,i); s->s2->tmp.session_id_length=i;
 502                 n2s(p,i); s->s2->challenge_length=i;
 503                 if (    (i < SSL2_MIN_CHALLENGE_LENGTH) ||
 504                         (i > SSL2_MAX_CHALLENGE_LENGTH))
 505                         {
 506                         SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
 507                         return(-1);
 508                         }
 509                 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
 510                 s->init_num=0;
 511                 }
 512
 513         /* SSL2_ST_GET_CLIENT_HELLO_C */
 514         p=(unsigned char *)s->init_buf->data;
 515         n=s->s2->tmp.cipher_spec_length+s->s2->challenge_length+
 516                 s->s2->tmp.session_id_length-s->init_num;
 517         i=ssl2_read(s,(char *)&(p[s->init_num]),n);
 518         if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
 519
 520         /* get session-id before cipher stuff so we can get out session
 521          * structure if it is cached */
 522         /* session-id */
 523         if ((s->s2->tmp.session_id_length != 0) &&
 524                 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
 525                 {
 526                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 527                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
 528                 return(-1);
 529                 }
 530
 531         if (s->s2->tmp.session_id_length == 0)
 532                 {
 533                 if (!ssl_get_new_session(s,1))
 534                         {
 535                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 536                         return(-1);
 537                         }
 538                 }
 539         else
 540                 {
 541                 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
 542                         s->s2->tmp.session_id_length);
 543                 if (i == 1)
 544                         { /* previous session */
 545                         s->hit=1;
 546                         }
 547                 else if (i == -1)
 548                         {
 549                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 550                         return(-1);
 551                         }
 552                 else
 553                         {
 554                         if (s->cert == NULL)
 555                                 {
 556                                 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 557                                 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
 558                                 return(-1);
 559                                 }
 560
 561                         if (!ssl_get_new_session(s,1))
 562                                 {
 563                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 564                                 return(-1);
 565                                 }
 566                         }
 567                 }
 568
 569         if (!s->hit)
 570                 {
 571                 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
 572                         &s->session->ciphers);
 573                 if (cs == NULL) goto mem_err;
 574
 575                 cl=ssl_get_ciphers_by_id(s);
 576
 577                 for (z=0; z<sk_num(cs); z++)
 578                         {
 579                         if (sk_find(cl,sk_value(cs,z)) < 0)
 580                                 {
 581                                 sk_delete(cs,z);
 582                                 z--;
 583                                 }
 584                         }
 585
 586                 /* s->session->ciphers should now have a list of
 587                  * ciphers that are on both the client and server.
 588                  * This list is ordered by the order the client sent
 589                  * the ciphers.
 590                  */
 591                 }
 592         p+=s->s2->tmp.cipher_spec_length;
 593         /* done cipher selection */
 594
 595         /* session id extracted already */
 596         p+=s->s2->tmp.session_id_length;
 597
 598         /* challenge */
 599         memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
 600         return(1);
 601 mem_err:
 602         SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 603         return(0);
 604         }
 605
 606 static int server_hello(s)
 607 SSL *s;
 608         {
 609         unsigned char *p,*d;
 610         int n,hit;
 611         STACK *sk;
 612
 613         p=(unsigned char *)s->init_buf->data;
 614         if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
 615                 {
 616                 d=p+11;
 617                 *(p++)=SSL2_MT_SERVER_HELLO;            /* type */
 618                 hit=s->hit;
 619                 *(p++)=(unsigned char)hit;
 620                 if (!hit)
 621                         {                       /* else add cert to session */
 622                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 623                         if (s->session->cert != NULL)
 624                                 ssl_cert_free(s->session->cert);
 625                         s->session->cert=s->cert;
 626                         }
 627                 else    /* We have a session id-cache hit, if the
 628                          * session-id has no certificate listed against
 629                          * the 'cert' structure, grab the 'old' one
 630                          * listed against the SSL connection */
 631                         {
 632                         if (s->session->cert == NULL)
 633                                 {
 634                                 CRYPTO_add(&s->cert->references,1,
 635                                         CRYPTO_LOCK_SSL_CERT);
 636                                 s->session->cert=s->cert;
 637                                 }
 638                         }
 639
 640                 if (s->session->cert == NULL)
 641                         {
 642                         ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
 643                         SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
 644                         return(-1);
 645                         }
 646
 647                 if (hit)
 648                         {
 649                         *(p++)=0;               /* no certificate type */
 650                         s2n(s->version,p);      /* version */
 651                         s2n(0,p);               /* cert len */
 652                         s2n(0,p);               /* ciphers len */
 653                         }
 654                 else
 655                         {
 656                         /* EAY EAY */
 657                         /* put certificate type */
 658                         *(p++)=SSL2_CT_X509_CERTIFICATE;
 659                         s2n(s->version,p);      /* version */
 660                         n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 661                         s2n(n,p);               /* certificate length */
 662                         i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
 663                         n=0;
 664
 665                         /* lets send out the ciphers we like in the
 666                          * prefered order */
 667                         sk= s->session->ciphers;
 668                         n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d);
 669                         d+=n;
 670                         s2n(n,p);               /* add cipher length */
 671                         }
 672
 673                 /* make and send conn_id */
 674                 s2n(SSL2_CONNECTION_ID_LENGTH,p);       /* add conn_id length */
 675                 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
 676                 RAND_bytes(s->s2->conn_id,(int)s->s2->conn_id_length);
 677                 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
 678                 d+=SSL2_CONNECTION_ID_LENGTH;
 679
 680                 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
 681                 s->init_num=d-(unsigned char *)s->init_buf->data;
 682                 s->init_off=0;
 683                 }
 684         /* SSL2_ST_SEND_SERVER_HELLO_B */
 685         /* If we are using TCP/IP, the performace is bad if we do 2
 686          * writes without a read between them.  This occurs when
 687          * Session-id reuse is used, so I will put in a buffering module
 688          */
 689         if (s->hit)
 690                 {
 691                 if (!ssl_init_wbio_buffer(s,1)) return(-1);
 692                 }
 693
 694         return(ssl2_do_write(s));
 695         }
 696
 697 static int get_client_finished(s)
 698 SSL *s;
 699         {
 700         unsigned char *p;
 701         int i;
 702
 703         p=(unsigned char *)s->init_buf->data;
 704         if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
 705                 {
 706                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
 707                 if (i < 1-s->init_num)
 708                         return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 709
 710                 if (*p != SSL2_MT_CLIENT_FINISHED)
 711                         {
 712                         if (*p != SSL2_MT_ERROR)
 713                                 {
 714                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 715                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
 716                                 }
 717                         else
 718                                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
 719                         return(-1);
 720                         }
 721                 s->init_num=0;
 722                 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
 723                 }
 724
 725         /* SSL2_ST_GET_CLIENT_FINISHED_B */
 726         i=ssl2_read(s,(char *)&(p[s->init_num]),s->s2->conn_id_length-s->init_num);
 727         if (i < (int)s->s2->conn_id_length-s->init_num)
 728                 {
 729                 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
 730                 }
 731         if (memcmp(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length) != 0)
 732                 {
 733                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 734                 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
 735                 return(-1);
 736                 }
 737         return(1);
 738         }
 739
 740 static int server_verify(s)
 741 SSL *s;
 742         {
 743         unsigned char *p;
 744
 745         if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
 746                 {
 747                 p=(unsigned char *)s->init_buf->data;
 748                 *(p++)=SSL2_MT_SERVER_VERIFY;
 749                 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
 750                 /* p+=s->s2->challenge_length; */
 751
 752                 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
 753                 s->init_num=s->s2->challenge_length+1;
 754                 s->init_off=0;
 755                 }
 756         return(ssl2_do_write(s));
 757         }
 758
 759 static int server_finish(s)
 760 SSL *s;
 761         {
 762         unsigned char *p;
 763
 764         if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
 765                 {
 766                 p=(unsigned char *)s->init_buf->data;
 767                 *(p++)=SSL2_MT_SERVER_FINISHED;
 768
 769                 memcpy(p,s->session->session_id,
 770                         (unsigned int)s->session->session_id_length);
 771                 /* p+=s->session->session_id_length; */
 772
 773                 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
 774                 s->init_num=s->session->session_id_length+1;
 775                 s->init_off=0;
 776                 }
 777
 778         /* SSL2_ST_SEND_SERVER_FINISHED_B */
 779         return(ssl2_do_write(s));
 780         }
 781
 782 /* send the request and check the response */
 783 static int request_certificate(s)
 784 SSL *s;
 785         {
 786         unsigned char *p,*p2,*buf2;
 787         unsigned char *ccd;
 788         int i,j,ctype,ret= -1;
 789         X509 *x509=NULL;
 790         STACK *sk=NULL;
 791
 792         ccd=s->s2->tmp.ccl;
 793         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
 794                 {
 795                 p=(unsigned char *)s->init_buf->data;
 796                 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
 797                 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
 798                 RAND_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 799                 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 800
 801                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
 802                 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
 803                 s->init_off=0;
 804                 }
 805
 806         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
 807                 {
 808                 i=ssl2_do_write(s);
 809                 if (i <= 0)
 810                         {
 811                         ret=i;
 812                         goto end;
 813                         }
 814
 815                 s->init_num=0;
 816                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
 817                 }
 818
 819         if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
 820                 {
 821                 p=(unsigned char *)s->init_buf->data;
 822                 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num);
 823                 if (i < 3)
 824                         {
 825                         ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 826                         goto end;
 827                         }
 828
 829                 if ((*p == SSL2_MT_ERROR) && (i >= 3))
 830                         {
 831                         n2s(p,i);
 832                         if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
 833                                 {
 834                                 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
 835                                 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
 836                                 goto end;
 837                                 }
 838                         ret=1;
 839                         goto end;
 840                         }
 841                 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (i < 6))
 842                         {
 843                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
 844                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
 845                         goto end;
 846                         }
 847                 /* ok we have a response */
 848                 /* certificate type, there is only one right now. */
 849                 ctype= *(p++);
 850                 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
 851                         {
 852                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
 853                         SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
 854                         goto end;
 855                         }
 856                 n2s(p,i); s->s2->tmp.clen=i;
 857                 n2s(p,i); s->s2->tmp.rlen=i;
 858                 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
 859                 s->init_num=0;
 860                 }
 861
 862         /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
 863         p=(unsigned char *)s->init_buf->data;
 864         j=s->s2->tmp.clen+s->s2->tmp.rlen-s->init_num;
 865         i=ssl2_read(s,(char *)&(p[s->init_num]),j);
 866         if (i < j)
 867                 {
 868                 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
 869                 goto end;
 870                 }
 871
 872         x509=(X509 *)d2i_X509(NULL,&p,(long)s->s2->tmp.clen);
 873         if (x509 == NULL)
 874                 {
 875                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
 876                 goto msg_end;
 877                 }
 878
 879         if (((sk=sk_new_null()) == NULL) || (!sk_push(sk,(char *)x509)))
 880                 {
 881                 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 882                 goto msg_end;
 883                 }
 884
 885         i=ssl_verify_cert_chain(s,sk);
 886
 887         if (i)  /* we like the packet, now check the chksum */
 888                 {
 889                 EVP_MD_CTX ctx;
 890                 EVP_PKEY *pkey=NULL;
 891
 892                 EVP_VerifyInit(&ctx,s->ctx->rsa_md5);
 893                 EVP_VerifyUpdate(&ctx,s->s2->key_material,
 894                         (unsigned int)s->s2->key_material_length);
 895                 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
 896
 897                 i=i2d_X509(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
 898                 buf2=(unsigned char *)Malloc((unsigned int)i);
 899                 if (buf2 == NULL)
 900                         {
 901                         SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 902                         goto msg_end;
 903                         }
 904                 p2=buf2;
 905                 i=i2d_X509(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
 906                 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
 907                 Free(buf2);
 908
 909                 pkey=X509_get_pubkey(x509);
 910                 if (pkey == NULL) goto end;
 911                 i=EVP_VerifyFinal(&ctx,p,s->s2->tmp.rlen,pkey);
 912                 EVP_PKEY_free(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         sk_free(sk);
 937         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