ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c */
   2 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #define REUSE_CIPHER_BUG
  60
  61 #include <stdio.h>
  62 #include "buffer.h"
  63 #include "rand.h"
  64 #include "objects.h"
  65 #include "evp.h"
  66 #include "x509.h"
  67 #include "ssl_locl.h"
  68
  69 #define BREAK   break
  70 /* SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_MALLOC_FAILURE);
  71  * SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
  72  * SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
  73  * SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_MALLOC_FAILURE);
  74  * SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
  75  */
  76
  77 #ifndef NOPROTO
  78 static int ssl3_get_client_hello(SSL *s);
  79 static int ssl3_send_server_hello(SSL *s);
  80 static int ssl3_send_server_key_exchange(SSL *s);
  81 static int ssl3_send_certificate_request(SSL *s);
  82 static int ssl3_send_server_done(SSL *s);
  83 static int ssl3_get_cert_verify(SSL *s);
  84 static int ssl3_get_client_key_exchange(SSL *s);
  85 static int ssl3_get_client_certificate(SSL *s);
  86 static int ssl3_send_hello_request(SSL *s);
  87
  88 #else
  89
  90 static int ssl3_get_client_hello();
  91 static int ssl3_send_server_hello();
  92 static int ssl3_send_server_key_exchange();
  93 static int ssl3_send_certificate_request();
  94 static int ssl3_send_server_done();
  95 static int ssl3_get_cert_verify();
  96 static int ssl3_get_client_key_exchange();
  97 static int ssl3_get_client_certificate();
  98 static int ssl3_send_hello_request();
  99 static SSL_METHOD *ssl3_get_server_method();
 100
 101 #endif
 102
 103 static SSL_METHOD *ssl3_get_server_method(ver)
 104 int ver;
 105         {
 106         if (ver == 3)
 107                 return(SSLv3_server_method());
 108         else
 109                 return(NULL);
 110         }
 111
 112 SSL_METHOD *SSLv3_server_method()
 113         {
 114         static int init=1;
 115         static SSL_METHOD SSLv3_server_data;
 116
 117         if (init)
 118                 {
 119                 init=0;
 120                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 121                         sizeof(SSL_METHOD));
 122                 SSLv3_server_data.ssl_accept=ssl3_accept;
 123                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 124                 }
 125         return(&SSLv3_server_data);
 126         }
 127
 128 int ssl3_accept(s)
 129 SSL *s;
 130         {
 131         BUF_MEM *buf;
 132         unsigned long l,Time=time(NULL);
 133         void (*cb)()=NULL;
 134         long num1;
 135         int ret= -1;
 136         CERT *ct;
 137         BIO *bbio,*under;
 138         int new_state,state,skip=0;
 139
 140         RAND_seed((unsigned char *)&Time,sizeof(Time));
 141         ERR_clear_error();
 142         errno=0;
 143
 144         if (s->info_callback != NULL)
 145                 cb=s->info_callback;
 146         else if (s->ctx->info_callback != NULL)
 147                 cb=s->ctx->info_callback;
 148
 149         /* init things to blank */
 150         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 151         s->in_handshake++;
 152
 153 #ifdef undef
 154         /* FIX THIS EAY EAY EAY */
 155         /* we don't actually need a cert, we just need a cert or a DH_tmp */
 156         if (((s->session == NULL) || (s->session->cert == NULL)) &&
 157                 (s->cert == NULL))
 158                 {
 159                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 160                 ret= -1;
 161                 goto end;
 162                 }
 163 #endif
 164
 165         for (;;)
 166                 {
 167                 state=s->state;
 168
 169                 switch (s->state)
 170                         {
 171                 case SSL_ST_RENEGOTIATE:
 172                         s->new_session=1;
 173                         /* s->state=SSL_ST_ACCEPT; */
 174
 175                 case SSL_ST_BEFORE:
 176                 case SSL_ST_ACCEPT:
 177                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 178                 case SSL_ST_OK|SSL_ST_ACCEPT:
 179
 180                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 181
 182                         s->version=3;
 183                         s->type=SSL_ST_ACCEPT;
 184
 185                         if (s->init_buf == NULL)
 186                                 {
 187                                 if ((buf=BUF_MEM_new()) == NULL)
 188                                         {
 189                                         ret= -1;
 190                                         goto end;
 191                                         }
 192                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 193                                         {
 194                                         ret= -1;
 195                                         goto end;
 196                                         }
 197                                 s->init_buf=buf;
 198                                 }
 199
 200                         if (!ssl3_setup_buffers(s))
 201                                 {
 202                                 ret= -1;
 203                                 goto end;
 204                                 }
 205
 206                         /* Ok, we now need to push on a buffering BIO so that
 207                          * the output is sent in a way that TCP likes :-)
 208                          */
 209                         if (s->bbio == NULL)
 210                                 {
 211                                 bbio=BIO_new(BIO_f_buffer());
 212                                 if (bbio == NULL)
 213                                         {
 214                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_LIB_BUF);
 215                                         ret= -1;
 216                                         goto end;
 217                                         }
 218                                 s->bbio=bbio;
 219                                 }
 220                         else
 221                                 bbio=s->bbio;
 222                         BIO_reset(bbio);
 223                         if (!BIO_set_write_buffer_size(bbio,16*1024))
 224                                 {
 225                                 SSLerr(SSL_F_SSL3_ACCEPT,ERR_LIB_BUF);
 226                                 ret= -1;
 227                                 goto end;
 228                                 }
 229
 230                         s->wbio=BIO_push(bbio,s->wbio);
 231
 232                         s->ctx->sess_accept++;
 233                         s->init_num=0;
 234
 235                         if (s->state != SSL_ST_RENEGOTIATE)
 236                                 {
 237                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 238                                 ssl3_init_finished_mac(s);
 239                                 }
 240                         else
 241                                 {
 242                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 243                                 }
 244                         break;
 245
 246                 case SSL3_ST_SW_HELLO_REQ_A:
 247                 case SSL3_ST_SW_HELLO_REQ_B:
 248
 249                         s->shutdown=0;
 250                         ret=ssl3_send_hello_request(s);
 251                         if (ret <= 0) goto end;
 252                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 253                         s->state=SSL3_ST_SW_FLUSH;
 254                         s->init_num=0;
 255
 256                         ssl3_init_finished_mac(s);
 257                         break;
 258
 259                 case SSL3_ST_SW_HELLO_REQ_C:
 260                         /* remove buffering on output */
 261                         under=BIO_pop(s->wbio);
 262                         if (under != NULL)
 263                                 s->wbio=under;
 264                         else
 265                                 abort(); /* ok */
 266                         BIO_free(s->bbio);
 267                         s->bbio=NULL;
 268
 269                         s->state=SSL_ST_OK;
 270                         ret=1;
 271                         goto end;
 272                         break;
 273
 274                 case SSL3_ST_SR_CLNT_HELLO_A:
 275                 case SSL3_ST_SR_CLNT_HELLO_B:
 276                 case SSL3_ST_SR_CLNT_HELLO_C:
 277
 278                         s->shutdown=0;
 279                         ret=ssl3_get_client_hello(s);
 280                         if (ret <= 0) goto end;
 281                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 282                         s->init_num=0;
 283                         break;
 284
 285                 case SSL3_ST_SW_SRVR_HELLO_A:
 286                 case SSL3_ST_SW_SRVR_HELLO_B:
 287                         ret=ssl3_send_server_hello(s);
 288                         if (ret <= 0) goto end;
 289
 290                         if (s->hit)
 291                                 s->state=SSL3_ST_SW_CHANGE_A;
 292                         else
 293                                 s->state=SSL3_ST_SW_CERT_A;
 294                         s->init_num=0;
 295                         break;
 296
 297                 case SSL3_ST_SW_CERT_A:
 298                 case SSL3_ST_SW_CERT_B:
 299                         /* Check if it is anon DH */
 300                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 301                                 {
 302                                 ret=ssl3_send_server_certificate(s);
 303                                 if (ret <= 0) goto end;
 304                                 }
 305                         else
 306                                 skip=1;
 307                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 308                         s->init_num=0;
 309                         break;
 310
 311                 case SSL3_ST_SW_KEY_EXCH_A:
 312                 case SSL3_ST_SW_KEY_EXCH_B:
 313                         l=s->s3->tmp.new_cipher->algorithms;
 314                         if (s->session->cert == NULL)
 315                                 {
 316                                 if (s->cert != NULL)
 317                                         {
 318                                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 319                                         s->session->cert=s->cert;
 320                                         }
 321                                 else
 322                                         {
 323                                         CRYPTO_add(&s->ctx->default_cert->references,1,CRYPTO_LOCK_SSL_CERT);
 324                                         s->session->cert=s->ctx->default_cert;
 325                                         }
 326                                 }
 327                         ct=s->session->cert;
 328
 329                         /* clear this, it may get reset by
 330                          * send_server_key_exchange */
 331                         if (s->ctx->options & SSL_OP_EPHEMERAL_RSA)
 332                                 s->s3->tmp.use_rsa_tmp=1;
 333                         else
 334                                 s->s3->tmp.use_rsa_tmp=0;
 335
 336                         /* only send if a DH key exchange, fortezza or
 337                          * RSA but we have a sign only certificate */
 338                         if ( s->s3->tmp.use_rsa_tmp ||
 339                             (l & (SSL_DH|SSL_kFZA)) ||
 340                             ((l & SSL_kRSA) &&
 341                              ((ct->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)||
 342                               ((l & SSL_EXPORT) &&
 343                                (EVP_PKEY_size(ct->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > 512)
 344                               )
 345                              )
 346                             )
 347                            )
 348                                 {
 349                                 ret=ssl3_send_server_key_exchange(s);
 350                                 if (ret <= 0) goto end;
 351                                 }
 352                         else
 353                                 skip=1;
 354
 355                         s->state=SSL3_ST_SW_CERT_REQ_A;
 356                         s->init_num=0;
 357                         break;
 358
 359                 case SSL3_ST_SW_CERT_REQ_A:
 360                 case SSL3_ST_SW_CERT_REQ_B:
 361                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 362                                 ((s->session->peer != NULL) &&
 363                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 364                                 {
 365                                 /* no cert request */
 366                                 skip=1;
 367                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 368                                 }
 369                         else
 370                                 {
 371                                 ret=ssl3_send_certificate_request(s);
 372                                 if (ret <= 0) goto end;
 373                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 374                                 s->init_num=0;
 375                                 }
 376                         break;
 377
 378                 case SSL3_ST_SW_SRVR_DONE_A:
 379                 case SSL3_ST_SW_SRVR_DONE_B:
 380                         ret=ssl3_send_server_done(s);
 381                         if (ret <= 0) goto end;
 382                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 383                         s->state=SSL3_ST_SW_FLUSH;
 384                         s->init_num=0;
 385                         break;
 386
 387                 case SSL3_ST_SW_FLUSH:
 388                         /* number of bytes to be flushed */
 389                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 390                         if (num1 > 0)
 391                                 {
 392                                 s->rwstate=SSL_WRITING;
 393                                 num1=BIO_flush(s->wbio);
 394                                 if (num1 <= 0) { ret= -1; goto end; }
 395                                 s->rwstate=SSL_NOTHING;
 396                                 }
 397
 398                         s->state=s->s3->tmp.next_state;
 399                         break;
 400
 401                 case SSL3_ST_SR_CERT_A:
 402                 case SSL3_ST_SR_CERT_B:
 403                         /* could be sent for a DH cert, even if we
 404                          * have not asked for it :-) */
 405                         ret=ssl3_get_client_certificate(s);
 406                         if (ret <= 0) goto end;
 407                         s->init_num=0;
 408                         s->state=SSL3_ST_SR_KEY_EXCH_A;
 409                         break;
 410
 411                 case SSL3_ST_SR_KEY_EXCH_A:
 412                 case SSL3_ST_SR_KEY_EXCH_B:
 413                         ret=ssl3_get_client_key_exchange(s);
 414                         if (ret <= 0) goto end;
 415                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 416                         s->init_num=0;
 417
 418                         /* We need to get hashes here so if there is
 419                          * a client cert, it can be verified */
 420                         ssl3_final_finish_mac(s,&(s->s3->finish_dgst1),
 421                                 NULL,&(s->s3->tmp.finish_md1[0]));
 422                         ssl3_final_finish_mac(s,&(s->s3->finish_dgst2),
 423                                 NULL,&(s->s3->tmp.finish_md2[0]));
 424
 425                         break;
 426
 427                 case SSL3_ST_SR_CERT_VRFY_A:
 428                 case SSL3_ST_SR_CERT_VRFY_B:
 429
 430                         /* we should decide if we expected this one */
 431                         ret=ssl3_get_cert_verify(s);
 432                         if (ret <= 0) goto end;
 433
 434                         s->state=SSL3_ST_SR_FINISHED_A;
 435                         s->init_num=0;
 436                         break;
 437
 438                 case SSL3_ST_SR_FINISHED_A:
 439                 case SSL3_ST_SR_FINISHED_B:
 440                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 441                                 SSL3_ST_SR_FINISHED_B,
 442                                 &(ssl3_client_finished_const[0]));
 443                         if (ret <= 0) goto end;
 444                         if (s->hit)
 445                                 s->state=SSL_ST_OK;
 446                         else
 447                                 s->state=SSL3_ST_SW_CHANGE_A;
 448                         s->init_num=0;
 449                         break;
 450
 451                 case SSL3_ST_SW_CHANGE_A:
 452                 case SSL3_ST_SW_CHANGE_B:
 453
 454                         s->session->cipher=s->s3->tmp.new_cipher;
 455                         if (!ssl3_setup_key_block(s)) { ret= -1; goto end; }
 456
 457                         ret=ssl3_send_change_cipher_spec(s,
 458                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 459
 460                         if (ret <= 0) goto end;
 461                         s->state=SSL3_ST_SW_FINISHED_A;
 462                         s->init_num=0;
 463
 464                         if (!ssl3_change_cipher_state(s,
 465                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 466                                 {
 467                                 ret= -1;
 468                                 goto end;
 469                                 }
 470
 471                         break;
 472
 473                 case SSL3_ST_SW_FINISHED_A:
 474                 case SSL3_ST_SW_FINISHED_B:
 475                         ret=ssl3_send_finished(s,
 476                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 477                                 &(ssl3_server_finished_const[0]));
 478                         if (ret <= 0) goto end;
 479                         s->state=SSL3_ST_SW_FLUSH;
 480                         if (s->hit)
 481                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 482                         else
 483                                 s->s3->tmp.next_state=SSL_ST_OK;
 484                         s->init_num=0;
 485                         break;
 486
 487                 case SSL_ST_OK:
 488                         /* clean a few things up */
 489                         ssl3_cleanup_key_block(s);
 490
 491                         BUF_MEM_free(s->init_buf);
 492                         s->init_buf=NULL;
 493
 494                         /* remove buffering on output */
 495                         under=BIO_pop(s->wbio);
 496                         if (under != NULL)
 497                                 s->wbio=under;
 498                         else
 499                                 abort(); /* ok */
 500                         BIO_free(s->bbio);
 501                         s->bbio=NULL;
 502
 503                         s->new_session=0;
 504                         s->init_num=0;
 505
 506                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 507
 508                         s->ctx->sess_accept_good++;
 509                         /* s->server=1; */
 510                         s->handshake_func=ssl3_accept;
 511                         ret=1;
 512
 513                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 514
 515                         goto end;
 516                         break;
 517
 518                 default:
 519                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 520                         ret= -1;
 521                         goto end;
 522                         break;
 523                         }
 524
 525                 if (!s->s3->tmp.reuse_message && !skip)
 526                         {
 527                         if (s->debug) BIO_flush(s->wbio);
 528
 529                         if ((cb != NULL) && (s->state != state))
 530                                 {
 531                                 new_state=s->state;
 532                                 s->state=state;
 533                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 534                                 s->state=new_state;
 535                                 }
 536                         }
 537                 skip=0;
 538                 }
 539 end:
 540         /* BIO_flush(s->wbio); */
 541
 542         if (cb != NULL)
 543                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 544         s->in_handshake--;
 545         return(ret);
 546         }
 547
 548 static int ssl3_send_hello_request(s)
 549 SSL *s;
 550         {
 551         unsigned char *p;
 552
 553         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 554                 {
 555                 p=(unsigned char *)s->init_buf->data;
 556                 *(p++)=SSL3_MT_CLIENT_REQUEST;
 557                 *(p++)=0;
 558                 *(p++)=0;
 559                 *(p++)=0;
 560
 561                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 562                 /* number of bytes to write */
 563                 s->init_num=4;
 564                 s->init_off=0;
 565                 }
 566
 567         /* SSL3_ST_SW_HELLO_REQ_B */
 568         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 569         }
 570
 571 static int ssl3_get_client_hello(s)
 572 SSL *s;
 573         {
 574         int i,j,ok,al,ret= -1;
 575         long n;
 576         unsigned long id;
 577         unsigned char *p,*d;
 578         SSL_CIPHER *c;
 579         STACK *ciphers=NULL;
 580
 581         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 582                 {
 583                 s->first_packet=1;
 584                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 585                 }
 586         n=ssl3_get_message(s,
 587                 SSL3_ST_SR_CLNT_HELLO_B,
 588                 SSL3_ST_SR_CLNT_HELLO_C,
 589                 SSL3_MT_CLIENT_HELLO,
 590                 SSL3_RT_MAX_PLAIN_LENGTH,
 591                 &ok);
 592
 593         if (!ok) return((int)n);
 594         d=p=(unsigned char *)s->init_buf->data;
 595
 596         if (p[0] != SSL3_VERSION_MAJOR)
 597                 {
 598                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
 599                 goto err;
 600                 }
 601         p+=2;
 602
 603         /* load the client random */
 604         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 605         p+=SSL3_RANDOM_SIZE;
 606
 607         /* get the session-id */
 608         j= *(p++);
 609
 610         s->hit=0;
 611         if (j == 0)
 612                 {
 613                 if (!ssl_get_new_session(s,1))
 614                         goto err;
 615                 }
 616         else
 617                 {
 618                 i=ssl_get_prev_session(s,j,p);
 619                 if (i == 1)
 620                         { /* previous session */
 621                         s->hit=1;
 622                         }
 623                 else
 624                         {
 625                         if (!ssl_get_new_session(s,1))
 626                                 goto err;
 627                         }
 628                 }
 629
 630         p+=j;
 631         n2s(p,i);
 632         if ((i == 0) && (j != 0))
 633                 {
 634                 /* we need a cipher if we are not resuming a session */
 635                 al=SSL3_AD_ILLEGAL_PARAMETER;
 636                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 637                 goto f_err;
 638                 }
 639         if ((i+p) > (d+n))
 640                 {
 641                 /* not enough data */
 642                 al=SSL3_AD_ILLEGAL_PARAMETER;
 643                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 644                 goto f_err;
 645                 }
 646         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 647                 == NULL))
 648                 {
 649                 goto err;
 650                 }
 651         p+=i;
 652
 653         /* If it is a hit, check that the cipher is in the list */
 654         if ((s->hit) && (i > 0))
 655                 {
 656                 j=0;
 657                 id=s->session->cipher->id;
 658
 659                 for (i=0; i<sk_num(ciphers); i++)
 660                         {
 661                         c=(SSL_CIPHER *)sk_value(ciphers,i);
 662                         if (c->id == id)
 663                                 {
 664                                 j=1;
 665                                 break;
 666                                 }
 667                         }
 668                 if (j == 0)
 669                         {
 670                         if ((s->ctx->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_num(ciphers) == 1))
 671                                 {
 672                                 /* Very bad for multi-threading.... */
 673                                 s->session->cipher=
 674                                         (SSL_CIPHER *)sk_value(ciphers,0);
 675                                 }
 676                         else
 677                                 {
 678                                 /* we need to have the cipher in the cipher
 679                                  * list if we are asked to reuse it */
 680                                 al=SSL3_AD_ILLEGAL_PARAMETER;
 681                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 682                                 goto f_err;
 683                                 }
 684                         }
 685                 }
 686
 687         /* compression */
 688         i= *(p++);
 689         for (j=0; j<i; j++)
 690                 if (p[j] == 0) break;
 691
 692         p+=i;
 693         if (j >= i)
 694                 {
 695                 /* no compress */
 696                 al=SSL3_AD_ILLEGAL_PARAMETER;
 697                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 698                 goto f_err;
 699                 }
 700
 701         if (p > (d+n))
 702                 {
 703                 /* wrong number of bytes,
 704                  * there could be more to follow */
 705                 al=SSL3_AD_ILLEGAL_PARAMETER;
 706                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 707                 goto f_err;
 708                 }
 709
 710         /* do nothing with compression */
 711
 712         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 713          * pick a cipher */
 714
 715         if (!s->hit)
 716                 {
 717                 if (s->session->ciphers != NULL)
 718                         sk_free(s->session->ciphers);
 719                 s->session->ciphers=ciphers;
 720                 if (ciphers == NULL)
 721                         {
 722                         al=SSL3_AD_HANDSHAKE_FAILURE;
 723                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 724                         goto f_err;
 725                         }
 726                 ciphers=NULL;
 727                 c=ssl3_choose_cipher(s,s->session->ciphers,
 728                         ssl_get_ciphers_by_id(s));
 729
 730                 if (c == NULL)
 731                         {
 732                         al=SSL3_AD_HANDSHAKE_FAILURE;
 733                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 734                         goto f_err;
 735                         }
 736                 s->s3->tmp.new_cipher=c;
 737                 }
 738         else
 739                 {
 740                 /* Session-id reuse */
 741 #ifdef REUSE_CIPHER_BUG
 742                 STACK *sk;
 743                 SSL_CIPHER *nc=NULL;
 744                 SSL_CIPHER *ec=NULL;
 745
 746                 if (s->ctx->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 747                         {
 748                         sk=s->session->ciphers;
 749                         for (i=0; i<sk_num(sk); i++)
 750                                 {
 751                                 c=(SSL_CIPHER *)sk_value(sk,i);
 752                                 if (c->algorithms & SSL_eNULL)
 753                                         nc=c;
 754                                 if (c->algorithms & SSL_EXP)
 755                                         ec=c;
 756                                 }
 757                         if (nc != NULL)
 758                                 s->s3->tmp.new_cipher=nc;
 759                         else if (ec != NULL)
 760                                 s->s3->tmp.new_cipher=ec;
 761                         else
 762                                 s->s3->tmp.new_cipher=s->session->cipher;
 763                         }
 764                 else
 765 #endif
 766                 s->s3->tmp.new_cipher=s->session->cipher;
 767                 }
 768
 769         /* we now have the following setup.
 770          * client_random
 771          * cipher_list          - our prefered list of ciphers
 772          * ciphers              - the clients prefered list of ciphers
 773          * compression          - basically ignored right now
 774          * ssl version is set   - sslv3
 775          * s->session           - The ssl session has been setup.
 776          * s->hit               - sesson reuse flag
 777          * s->tmp.new_cipher    - the new cipher to use.
 778          */
 779
 780         ret=1;
 781         if (0)
 782                 {
 783 f_err:
 784                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 785                 }
 786 err:
 787         if (ciphers != NULL) sk_free(ciphers);
 788         return(ret);
 789         }
 790
 791 static int ssl3_send_server_hello(s)
 792 SSL *s;
 793         {
 794         unsigned char *buf;
 795         unsigned char *p,*d;
 796         int i,sl;
 797         unsigned long l,Time;
 798
 799         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 800                 {
 801                 buf=(unsigned char *)s->init_buf->data;
 802                 p=s->s3->server_random;
 803                 Time=time(NULL);                        /* Time */
 804                 l2n(Time,p);
 805                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 806                 /* Do the message type and length last */
 807                 d=p= &(buf[4]);
 808
 809                 *(p++)=SSL3_VERSION_MAJOR;
 810                 *(p++)=SSL3_VERSION_MINOR;
 811
 812                 /* Random stuff */
 813                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 814                 p+=SSL3_RANDOM_SIZE;
 815
 816                 /* now in theory we have 3 options to sending back the
 817                  * session id.  If it is a re-use, we send back the
 818                  * old session-id, if it is a new session, we send
 819                  * back the new session-id or we send back a 0 length
 820                  * session-id if we want it to be single use.
 821                  * Currently I will not implement the '0' length session-id
 822                  */
 823
 824                 sl=s->session->session_id_length;
 825                 *(p++)=sl;
 826                 memcpy(p,s->session->session_id,sl);
 827                 p+=sl;
 828
 829                 /* put the cipher */
 830                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 831                 p+=i;
 832
 833                 /* put the compression method */
 834                 *(p++)=0;
 835
 836                 /* do the header */
 837                 l=(p-d);
 838                 d=buf;
 839                 *(d++)=SSL3_MT_SERVER_HELLO;
 840                 l2n3(l,d);
 841
 842                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 843                 /* number of bytes to write */
 844                 s->init_num=p-buf;
 845                 s->init_off=0;
 846                 }
 847
 848         /* SSL3_ST_CW_CLNT_HELLO_B */
 849         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 850         }
 851
 852 static int ssl3_send_server_done(s)
 853 SSL *s;
 854         {
 855         unsigned char *p;
 856
 857         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 858                 {
 859                 p=(unsigned char *)s->init_buf->data;
 860
 861                 /* do the header */
 862                 *(p++)=SSL3_MT_SERVER_DONE;
 863                 *(p++)=0;
 864                 *(p++)=0;
 865                 *(p++)=0;
 866
 867                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 868                 /* number of bytes to write */
 869                 s->init_num=4;
 870                 s->init_off=0;
 871                 }
 872
 873         /* SSL3_ST_CW_CLNT_HELLO_B */
 874         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 875         }
 876
 877 static int ssl3_send_server_key_exchange(s)
 878 SSL *s;
 879         {
 880 #ifndef NO_RSA
 881         unsigned char *q;
 882         int j,num;
 883         RSA *rsa;
 884         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 885 #endif
 886 #ifndef NO_DH
 887         DH *dh,*dhp;
 888 #endif
 889         EVP_PKEY *pkey;
 890         unsigned char *p,*d;
 891         int al,i;
 892         unsigned long type;
 893         int n;
 894         CERT *cert;
 895         BIGNUM *r[4];
 896         int nr[4],kn;
 897         BUF_MEM *buf;
 898         EVP_MD_CTX md_ctx;
 899
 900         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 901                 {
 902                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 903                 cert=s->session->cert;
 904
 905                 buf=s->init_buf;
 906
 907                 r[0]=r[1]=r[2]=r[3]=NULL;
 908                 n=0;
 909 #ifndef NO_RSA
 910                 if (type & SSL_kRSA)
 911                         {
 912                         rsa=cert->rsa_tmp;
 913                         if ((rsa == NULL) && (s->ctx->default_cert->rsa_tmp_cb != NULL))
 914                                 {
 915                                 rsa=s->ctx->default_cert->rsa_tmp_cb(s,
 916                                         (s->s3->tmp.new_cipher->algorithms|
 917                                         SSL_NOT_EXP)?0:1);
 918                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 919                                 cert->rsa_tmp=rsa;
 920                                 }
 921                         if (rsa == NULL)
 922                                 {
 923                                 al=SSL3_AD_HANDSHAKE_FAILURE;
 924                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 925                                 goto f_err;
 926                                 }
 927                         r[0]=rsa->n;
 928                         r[1]=rsa->e;
 929                         s->s3->tmp.use_rsa_tmp=1;
 930                         }
 931                 else
 932 #endif
 933 #ifndef NO_DH
 934                         if (type & SSL_kEDH)
 935                         {
 936                         dhp=cert->dh_tmp;
 937                         if ((dhp == NULL) && (cert->dh_tmp_cb != NULL))
 938                                 dhp=cert->dh_tmp_cb(s,
 939                                         (s->s3->tmp.new_cipher->algorithms|
 940                                         SSL_NOT_EXP)?0:1);
 941                         if (dhp == NULL)
 942                                 {
 943                                 al=SSL3_AD_HANDSHAKE_FAILURE;
 944                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 945                                 goto f_err;
 946                                 }
 947                         if ((dh=DHparams_dup(dhp)) == NULL)
 948                                 {
 949                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 950                                 goto err;
 951                                 }
 952
 953                         s->s3->tmp.dh=dh;
 954                         if (((dhp->pub_key == NULL) ||
 955                              (dhp->priv_key == NULL) ||
 956                              (s->ctx->options & SSL_OP_SINGLE_DH_USE)) &&
 957                             (!DH_generate_key(dh)))
 958                                 {
 959                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 960                                 goto err;
 961                                 }
 962                         else
 963                                 {
 964                                 dh->pub_key=BN_dup(dhp->pub_key);
 965                                 dh->priv_key=BN_dup(dhp->priv_key);
 966                                 if ((dh->pub_key == NULL) ||
 967                                         (dh->priv_key == NULL))
 968                                         {
 969                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 970                                         goto err;
 971                                         }
 972                                 }
 973                         r[0]=dh->p;
 974                         r[1]=dh->g;
 975                         r[2]=dh->pub_key;
 976                         }
 977                 else
 978 #endif
 979                         {
 980                         al=SSL3_AD_HANDSHAKE_FAILURE;
 981                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 982                         goto f_err;
 983                         }
 984                 for (i=0; r[i] != NULL; i++)
 985                         {
 986                         nr[i]=BN_num_bytes(r[i]);
 987                         n+=2+nr[i];
 988                         }
 989
 990                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 991                         {
 992                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 993                                 == NULL)
 994                                 {
 995                                 al=SSL3_AD_HANDSHAKE_FAILURE;
 996                                 goto f_err;
 997                                 }
 998                         kn=EVP_PKEY_size(pkey);
 999                         }
1000                 else
1001                         {
1002                         pkey=NULL;
1003                         kn=0;
1004                         }
1005
1006                 if (!BUF_MEM_grow(buf,n+4+kn))
1007                         {
1008                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1009                         goto err;
1010                         }
1011                 d=(unsigned char *)s->init_buf->data;
1012                 p= &(d[4]);
1013
1014                 for (i=0; r[i] != NULL; i++)
1015                         {
1016                         s2n(nr[i],p);
1017                         BN_bn2bin(r[i],p);
1018                         p+=nr[i];
1019                         }
1020
1021                 /* not anonymous */
1022                 if (pkey != NULL)
1023                         {
1024                         /* n is the length of the params, they start at &(d[4])
1025                          * and p points to the space at the end. */
1026 #ifndef NO_RSA
1027                         if (pkey->type == EVP_PKEY_RSA)
1028                                 {
1029                                 q=md_buf;
1030                                 j=0;
1031                                 for (num=2; num > 0; num--)
1032                                         {
1033                                         EVP_DigestInit(&md_ctx,(num == 2)?EVP_md5():EVP_sha1());
1034                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1035                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1036                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1037                                         EVP_DigestFinal(&md_ctx,q,
1038                                                 (unsigned int *)&i);
1039                                         q+=i;
1040                                         j+=i;
1041                                         }
1042                                 i=RSA_private_encrypt(j,md_buf,&(p[2]),
1043                                         pkey->pkey.rsa,RSA_PKCS1_PADDING);
1044                                 if (i <= 0)
1045                                         {
1046                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1047                                         goto err;
1048                                         }
1049                                 s2n(i,p);
1050                                 n+=i+2;
1051                                 }
1052                         else
1053 #endif
1054 #if !defined(NO_DSA)
1055                                 if (pkey->type == EVP_PKEY_DSA)
1056                                 {
1057                                 /* lets do DSS */
1058                                 EVP_SignInit(&md_ctx,EVP_dss1());
1059                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1060                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1061                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1062                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1063                                         (unsigned int *)&i,pkey))
1064                                         {
1065                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1066                                         goto err;
1067                                         }
1068                                 s2n(i,p);
1069                                 n+=i+2;
1070                                 }
1071                         else
1072 #endif
1073                                 {
1074                                 /* Is this error check actually needed? */
1075                                 al=SSL3_AD_HANDSHAKE_FAILURE;
1076                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1077                                 goto f_err;
1078                                 }
1079                         }
1080
1081                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1082                 l2n3(n,d);
1083
1084                 /* we should now have things packed up, so lets send
1085                  * it off */
1086                 s->init_num=n+4;
1087                 s->init_off=0;
1088                 }
1089
1090         /* SSL3_ST_SW_KEY_EXCH_B */
1091         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1092 f_err:
1093         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1094 err:
1095         return(-1);
1096         }
1097
1098 static int ssl3_send_certificate_request(s)
1099 SSL *s;
1100         {
1101         unsigned char *p,*d;
1102         int i,j,nl,off,n;
1103         STACK *sk=NULL;
1104         X509_NAME *name;
1105         BUF_MEM *buf;
1106
1107         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1108                 {
1109                 buf=s->init_buf;
1110
1111                 d=p=(unsigned char *)&(buf->data[4]);
1112
1113                 /* get the list of acceptable cert types */
1114                 p++;
1115                 n=ssl3_get_req_cert_type(s,p);
1116                 d[0]=n;
1117                 p+=n;
1118                 n++;
1119
1120                 off=n;
1121                 p+=2;
1122                 n+=2;
1123
1124                 sk=SSL_get_client_CA_list(s);
1125                 nl=0;
1126                 if (sk != NULL)
1127                         {
1128                         for (i=0; i<sk_num(sk); i++)
1129                                 {
1130                                 name=(X509_NAME *)sk_value(sk,i);
1131                                 j=i2d_X509_NAME(name,NULL);
1132                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1133                                         {
1134                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1135                                         goto err;
1136                                         }
1137                                 p=(unsigned char *)&(buf->data[4+n]);
1138                                 if (!(s->ctx->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1139                                         {
1140                                         s2n(j,p);
1141                                         i2d_X509_NAME(name,&p);
1142                                         n+=2+j;
1143                                         nl+=2+j;
1144                                         }
1145                                 else
1146                                         {
1147                                         d=p;
1148                                         i2d_X509_NAME(name,&p);
1149                                         j-=2; s2n(j,d); j+=2;
1150                                         n+=j;
1151                                         nl+=j;
1152                                         }
1153                                 }
1154                         }
1155                 /* else no CA names */
1156                 p=(unsigned char *)&(buf->data[4+off]);
1157                 s2n(nl,p);
1158
1159                 d=(unsigned char *)buf->data;
1160                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1161                 l2n3(n,d);
1162
1163                 /* we should now have things packed up, so lets send
1164                  * it off */
1165
1166                 s->init_num=n+4;
1167                 s->init_off=0;
1168                 }
1169
1170         /* SSL3_ST_SW_CERT_REQ_B */
1171         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1172 err:
1173         return(-1);
1174         }
1175
1176 static int ssl3_get_client_key_exchange(s)
1177 SSL *s;
1178         {
1179         int i,al,ok;
1180         long n;
1181         unsigned long l;
1182         unsigned char *p;
1183         RSA *rsa=NULL;
1184         BIGNUM *pub=NULL;
1185         EVP_PKEY *pkey=NULL;
1186         DH *dh_srvr;
1187
1188         n=ssl3_get_message(s,
1189                 SSL3_ST_SR_KEY_EXCH_A,
1190                 SSL3_ST_SR_KEY_EXCH_B,
1191                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1192                 400, /* ???? */
1193                 &ok);
1194
1195         if (!ok) return((int)n);
1196         p=(unsigned char *)s->init_buf->data;
1197
1198         l=s->s3->tmp.new_cipher->algorithms;
1199
1200 #ifndef NO_RSA
1201         if (l & SSL_kRSA)
1202                 {
1203                 /* FIX THIS UP EAY EAY EAY EAY */
1204                 if (s->s3->tmp.use_rsa_tmp)
1205                         {
1206                         if ((s->session->cert != NULL) &&
1207                                 (s->session->cert->rsa_tmp != NULL))
1208                                 rsa=s->session->cert->rsa_tmp;
1209                         else if ((s->ctx->default_cert != NULL) &&
1210                                 (s->ctx->default_cert->rsa_tmp != NULL))
1211                                 rsa=s->ctx->default_cert->rsa_tmp;
1212                         /* Don't do a callback because rsa_tmp should
1213                          * be sent already */
1214                         if (rsa == NULL)
1215                                 {
1216                                 al=SSL3_AD_HANDSHAKE_FAILURE;
1217                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1218                                 goto f_err;
1219
1220                                 }
1221                         }
1222                 else
1223                         {
1224                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1225                         if (    (pkey == NULL) ||
1226                                 (pkey->type != EVP_PKEY_RSA) ||
1227                                 (pkey->pkey.rsa == NULL))
1228                                 {
1229                                 al=SSL3_AD_HANDSHAKE_FAILURE;
1230                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1231                                 goto f_err;
1232                                 }
1233                         rsa=pkey->pkey.rsa;
1234                         }
1235
1236                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1237 #if 1
1238                 /* If a bad decrypt, use a dud master key */
1239                 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1240                         (p[0] != 3) ||
1241                          (p[1] != 0))
1242                         {
1243                         p[0]=3;
1244                         p[1]=0;
1245                         RAND_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1246                         i=SSL_MAX_MASTER_KEY_LENGTH;
1247                         }
1248 #else
1249                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1250                         {
1251                         al=SSL_AD_DECODE_ERROR;
1252                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1253                         goto f_err;
1254                         }
1255
1256                 if ((p[0] != (s->version>>8)) || (p[1] != (s->version & 0xff)))
1257                         {
1258                         al=SSL_AD_DECODE_ERROR;
1259                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1260                         goto f_err;
1261                         }
1262 #endif
1263
1264                 s->session->master_key_length=
1265                         ssl3_generate_master_secret(s,
1266                                 s->session->master_key,
1267                                 p,i);
1268                 memset(p,0,i);
1269                 }
1270         else
1271 #endif
1272 #ifndef NO_DH
1273                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1274                 {
1275
1276                 n2s(p,i);
1277                 if (n != i+2)
1278                         {
1279                         if (!(s->ctx->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1280                                 {
1281                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1282                                 goto err;
1283                                 }
1284                         else
1285                                 {
1286                                 p-=2;
1287                                 i=(int)n;
1288                                 }
1289                         }
1290
1291                 if (n == 0L) /* the parameters are in the cert */
1292                         {
1293                         al=SSL3_AD_HANDSHAKE_FAILURE;
1294                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1295                         goto f_err;
1296                         }
1297                 else
1298                         {
1299                         if (s->s3->tmp.dh == NULL)
1300                                 {
1301                                 al=SSL3_AD_HANDSHAKE_FAILURE;
1302                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1303                                 goto f_err;
1304                                 }
1305                         else
1306                                 dh_srvr=s->s3->tmp.dh;
1307                         }
1308
1309                 pub=BN_bin2bn(p,i,NULL);
1310                 if (pub == NULL)
1311                         {
1312                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1313                         goto err;
1314                         }
1315                 i=DH_compute_key(p,pub,dh_srvr);
1316
1317                 if (i <= 0)
1318                         {
1319                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1320                         goto err;
1321                         }
1322
1323                 DH_free(s->s3->tmp.dh);
1324                 s->s3->tmp.dh=NULL;
1325
1326                 BN_clear_free(pub);
1327                 pub=NULL;
1328                 s->session->master_key_length=
1329                         ssl3_generate_master_secret(s,
1330                                 s->session->master_key,p,i);
1331                 }
1332         else
1333 #endif
1334                 {
1335                 al=SSL3_AD_HANDSHAKE_FAILURE;
1336                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1337                 goto f_err;
1338                 }
1339
1340         return(1);
1341 f_err:
1342         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1343 err:
1344         return(-1);
1345         }
1346
1347 static int ssl3_get_cert_verify(s)
1348 SSL *s;
1349         {
1350         EVP_PKEY *pkey=NULL;
1351         unsigned char *p;
1352         int al,ok,ret=0;
1353         long n;
1354         int type=0,i,j;
1355         X509 *peer;
1356
1357         n=ssl3_get_message(s,
1358                 SSL3_ST_SR_CERT_VRFY_A,
1359                 SSL3_ST_SR_CERT_VRFY_B,
1360                 -1,
1361                 512, /* 512? */
1362                 &ok);
1363
1364         if (!ok) return((int)n);
1365
1366         if (s->session->peer != NULL)
1367                 {
1368                 peer=s->session->peer;
1369                 pkey=X509_get_pubkey(peer);
1370                 type=X509_certificate_type(peer,pkey);
1371                 }
1372         else
1373                 {
1374                 peer=NULL;
1375                 pkey=NULL;
1376                 }
1377
1378         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1379                 {
1380                 s->s3->tmp.reuse_message=1;
1381                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1382                         {
1383                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1384                         al=SSL3_AD_UNEXPECTED_MESSAGE;
1385                         goto f_err;
1386                         }
1387                 ret=1;
1388                 goto end;
1389                 }
1390
1391         if (peer == NULL)
1392                 {
1393                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1394                 al=SSL3_AD_UNEXPECTED_MESSAGE;
1395                 goto f_err;
1396                 }
1397
1398         if (!(type & EVP_PKT_SIGN))
1399                 {
1400                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1401                 al=SSL3_AD_ILLEGAL_PARAMETER;
1402                 goto f_err;
1403                 }
1404
1405         if (s->s3->change_cipher_spec)
1406                 {
1407                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1408                 al=SSL3_AD_UNEXPECTED_MESSAGE;
1409                 goto f_err;
1410                 }
1411
1412         /* we now have a signature that we need to verify */
1413         p=(unsigned char *)s->init_buf->data;
1414         n2s(p,i);
1415         n-=2;
1416         if (i > n)
1417                 {
1418                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1419                 al=SSL3_AD_ILLEGAL_PARAMETER;
1420                 goto f_err;
1421                 }
1422
1423         j=EVP_PKEY_size(pkey);
1424         if ((i > j) || (n > j) || (n <= 0))
1425                 {
1426                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1427                 al=SSL3_AD_ILLEGAL_PARAMETER;
1428                 goto f_err;
1429                 }
1430
1431 #ifndef NO_RSA
1432         if (pkey->type == EVP_PKEY_RSA)
1433                 {
1434                 i=RSA_public_decrypt(i,p,p,pkey->pkey.rsa,RSA_PKCS1_PADDING);
1435                 if (i < 0)
1436                         {
1437                         al=SSL3_AD_ILLEGAL_PARAMETER;
1438                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1439                         goto f_err;
1440                         }
1441                 if ((i != (MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH)) ||
1442                         memcmp(&(s->s3->tmp.finish_md1[0]),
1443                                 p,MD5_DIGEST_LENGTH) ||
1444                         memcmp(&(s->s3->tmp.finish_md2[0]),
1445                                 &(p[MD5_DIGEST_LENGTH]),SHA_DIGEST_LENGTH))
1446                         {
1447                         al=SSL3_AD_ILLEGAL_PARAMETER;
1448                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1449                         goto f_err;
1450                         }
1451                 }
1452         else
1453 #endif
1454 #ifndef NO_DSA
1455                 if (pkey->type == EVP_PKEY_DSA)
1456                 {
1457                 j=DSA_verify(pkey->save_type,s->s3->tmp.finish_md2,
1458                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1459                 if (j <= 0)
1460                         {
1461                         /* bad signature */
1462                         al=SSL3_AD_ILLEGAL_PARAMETER;
1463                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1464                         goto f_err;
1465                         }
1466                 }
1467         else
1468 #endif
1469                 {
1470                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1471                 al=SSL3_AD_UNSUPPORTED_CERTIFICATE;
1472                 goto f_err;
1473                 }
1474
1475
1476         ret=1;
1477         if (0)
1478                 {
1479 f_err:
1480                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1481                 }
1482 end:
1483         return(ret);
1484         }
1485
1486 static int ssl3_get_client_certificate(s)
1487 SSL *s;
1488         {
1489         int i,ok,al,ret= -1;
1490         X509 *x=NULL;
1491         unsigned long l,nc,llen,n;
1492         unsigned char *p,*d,*q;
1493         STACK *sk=NULL;
1494
1495         n=ssl3_get_message(s,
1496                 SSL3_ST_SR_CERT_A,
1497                 SSL3_ST_SR_CERT_B,
1498                 -1,
1499 #if defined(MSDOS) && !defined(WIN32)
1500                 1024*30, /* 30k max cert list :-) */
1501 #else
1502                 1024*100, /* 100k max cert list :-) */
1503 #endif
1504                 &ok);
1505
1506         if (!ok) return((int)n);
1507
1508         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1509                 {
1510                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1511                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1512                         {
1513                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1514                         al=SSL3_AD_NO_CERTIFICATE;
1515                         goto f_err;
1516                         }
1517                 s->s3->tmp.reuse_message=1;
1518                 return(1);
1519                 }
1520
1521         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1522                 {
1523                 al=SSL3_AD_UNEXPECTED_MESSAGE;
1524                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1525                 goto f_err;
1526                 }
1527         d=p=(unsigned char *)s->init_buf->data;
1528
1529         if ((sk=sk_new_null()) == NULL)
1530                 {
1531                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1532                 goto err;
1533                 }
1534
1535         n2l3(p,llen);
1536         if (llen+3 != n)
1537                 {
1538                 al=SSL3_AD_ILLEGAL_PARAMETER;
1539                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1540                 goto f_err;
1541                 }
1542         for (nc=0; nc<llen; )
1543                 {
1544                 n2l3(p,l);
1545                 if ((l+nc+3) > llen)
1546                         {
1547                         al=SSL3_AD_ILLEGAL_PARAMETER;
1548                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1549                         goto f_err;
1550                         }
1551
1552                 q=p;
1553                 x=d2i_X509(NULL,&p,l);
1554                 if (x == NULL)
1555                         {
1556                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1557                         goto err;
1558                         }
1559                 if (p != (q+l))
1560                         {
1561                         al=SSL3_AD_ILLEGAL_PARAMETER;
1562                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1563                         goto f_err;
1564                         }
1565                 if (!sk_push(sk,(char *)x))
1566                         {
1567                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1568                         goto err;
1569                         }
1570                 x=NULL;
1571                 nc+=l+3;
1572                 }
1573
1574         if (sk_num(sk) <= 0)
1575                 {
1576                 al=SSL3_AD_ILLEGAL_PARAMETER;
1577                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_PASSED);
1578                 goto f_err;
1579                 }
1580         i=ssl_verify_cert_chain(s,sk);
1581         if (!i)
1582                 {
1583                 al=ssl_verify_alarm_type(s->verify_result);
1584                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1585                 goto f_err;
1586                 }
1587
1588         /* This should not be needed */
1589         if (s->session->peer != NULL)
1590                 X509_free(s->session->peer);
1591
1592         s->session->peer=(X509 *)sk_shift(sk);
1593
1594         ret=1;
1595         if (0)
1596                 {
1597 f_err:
1598                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1599                 }
1600 err:
1601         if (x != NULL) X509_free(x);
1602         if (sk != NULL) sk_pop_free(sk,X509_free);
1603         return(ret);
1604         }
1605
1606 int ssl3_send_server_certificate(s)
1607 SSL *s;
1608         {
1609         unsigned long l;
1610         X509 *x;
1611
1612         if (s->state == SSL3_ST_SW_CERT_A)
1613                 {
1614                 x=ssl_get_server_send_cert(s);
1615                 if (x == NULL)
1616                         {
1617                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1618                         return(0);
1619                         }
1620
1621                 l=ssl3_output_cert_chain(s,x);
1622                 s->state=SSL3_ST_SW_CERT_B;
1623                 s->init_num=(int)l;
1624                 s->init_off=0;
1625                 }
1626
1627         /* SSL3_ST_SW_CERT_B */
1628         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1629         }