ssl/s3_srvr.c

   1 /* ssl/s3_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 #define REUSE_CIPHER_BUG
  60
  61 #include <stdio.h>
  62 #include <openssl/buffer.h>
  63 #include <openssl/rand.h>
  64 #include <openssl/objects.h>
  65 #include <openssl/md5.h>
  66 #include <openssl/sha.h>
  67 #include <openssl/evp.h>
  68 #include <openssl/x509.h>
  69 #include "ssl_locl.h"
  70
  71 static SSL_METHOD *ssl3_get_server_method(int ver);
  72 static int ssl3_get_client_hello(SSL *s);
  73 static int ssl3_send_server_hello(SSL *s);
  74 static int ssl3_send_server_key_exchange(SSL *s);
  75 static int ssl3_send_certificate_request(SSL *s);
  76 static int ssl3_send_server_done(SSL *s);
  77 static int ssl3_get_cert_verify(SSL *s);
  78 static int ssl3_get_client_key_exchange(SSL *s);
  79 static int ssl3_get_client_certificate(SSL *s);
  80 static int ssl3_send_hello_request(SSL *s);
  81
  82 static SSL_METHOD *ssl3_get_server_method(int ver)
  83         {
  84         if (ver == SSL3_VERSION)
  85                 return(SSLv3_server_method());
  86         else
  87                 return(NULL);
  88         }
  89
  90 SSL_METHOD *SSLv3_server_method(void)
  91         {
  92         static int init=1;
  93         static SSL_METHOD SSLv3_server_data;
  94
  95         if (init)
  96                 {
  97                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
  98                         sizeof(SSL_METHOD));
  99                 SSLv3_server_data.ssl_accept=ssl3_accept;
 100                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 101                 init=0;
 102                 }
 103         return(&SSLv3_server_data);
 104         }
 105
 106 int ssl3_accept(SSL *s)
 107         {
 108         BUF_MEM *buf;
 109         unsigned long l,Time=time(NULL);
 110         void (*cb)()=NULL;
 111         long num1;
 112         int ret= -1;
 113         int new_state,state,skip=0;
 114
 115         RAND_seed(&Time,sizeof(Time));
 116         ERR_clear_error();
 117         clear_sys_error();
 118
 119         if (s->info_callback != NULL)
 120                 cb=s->info_callback;
 121         else if (s->ctx->info_callback != NULL)
 122                 cb=s->ctx->info_callback;
 123
 124         /* init things to blank */
 125         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 126         s->in_handshake++;
 127
 128         if (s->cert == NULL)
 129                 {
 130                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 131                 return(-1);
 132                 }
 133
 134         for (;;)
 135                 {
 136                 state=s->state;
 137
 138                 switch (s->state)
 139                         {
 140                 case SSL_ST_RENEGOTIATE:
 141                         s->new_session=1;
 142                         /* s->state=SSL_ST_ACCEPT; */
 143
 144                 case SSL_ST_BEFORE:
 145                 case SSL_ST_ACCEPT:
 146                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 147                 case SSL_ST_OK|SSL_ST_ACCEPT:
 148
 149                         s->server=1;
 150                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 151
 152                         if ((s->version>>8) != 3)
 153                                 abort();
 154                         /* s->version=SSL3_VERSION; */
 155                         s->type=SSL_ST_ACCEPT;
 156
 157                         if (s->init_buf == NULL)
 158                                 {
 159                                 if ((buf=BUF_MEM_new()) == NULL)
 160                                         {
 161                                         ret= -1;
 162                                         goto end;
 163                                         }
 164                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 165                                         {
 166                                         ret= -1;
 167                                         goto end;
 168                                         }
 169                                 s->init_buf=buf;
 170                                 }
 171
 172                         if (!ssl3_setup_buffers(s))
 173                                 {
 174                                 ret= -1;
 175                                 goto end;
 176                                 }
 177
 178                         /* Ok, we now need to push on a buffering BIO so that
 179                          * the output is sent in a way that TCP likes :-)
 180                          */
 181                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 182
 183                         s->init_num=0;
 184
 185                         if (s->state != SSL_ST_RENEGOTIATE)
 186                                 {
 187                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 188                                 ssl3_init_finished_mac(s);
 189                                 s->ctx->stats.sess_accept++;
 190                                 }
 191                         else
 192                                 {
 193                                 s->ctx->stats.sess_accept_renegotiate++;
 194                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 195                                 }
 196                         break;
 197
 198                 case SSL3_ST_SW_HELLO_REQ_A:
 199                 case SSL3_ST_SW_HELLO_REQ_B:
 200
 201                         s->shutdown=0;
 202                         ret=ssl3_send_hello_request(s);
 203                         if (ret <= 0) goto end;
 204                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 205                         s->state=SSL3_ST_SW_FLUSH;
 206                         s->init_num=0;
 207
 208                         ssl3_init_finished_mac(s);
 209                         break;
 210
 211                 case SSL3_ST_SW_HELLO_REQ_C:
 212                         s->state=SSL_ST_OK;
 213                         ret=1;
 214                         goto end;
 215                         /* break; */
 216
 217                 case SSL3_ST_SR_CLNT_HELLO_A:
 218                 case SSL3_ST_SR_CLNT_HELLO_B:
 219                 case SSL3_ST_SR_CLNT_HELLO_C:
 220
 221                         s->shutdown=0;
 222                         ret=ssl3_get_client_hello(s);
 223                         if (ret <= 0) goto end;
 224                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 225                         s->init_num=0;
 226                         break;
 227
 228                 case SSL3_ST_SW_SRVR_HELLO_A:
 229                 case SSL3_ST_SW_SRVR_HELLO_B:
 230                         ret=ssl3_send_server_hello(s);
 231                         if (ret <= 0) goto end;
 232
 233                         if (s->hit)
 234                                 s->state=SSL3_ST_SW_CHANGE_A;
 235                         else
 236                                 s->state=SSL3_ST_SW_CERT_A;
 237                         s->init_num=0;
 238                         break;
 239
 240                 case SSL3_ST_SW_CERT_A:
 241                 case SSL3_ST_SW_CERT_B:
 242                         /* Check if it is anon DH */
 243                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 244                                 {
 245                                 ret=ssl3_send_server_certificate(s);
 246                                 if (ret <= 0) goto end;
 247                                 }
 248                         else
 249                                 skip=1;
 250                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 251                         s->init_num=0;
 252                         break;
 253
 254                 case SSL3_ST_SW_KEY_EXCH_A:
 255                 case SSL3_ST_SW_KEY_EXCH_B:
 256                         l=s->s3->tmp.new_cipher->algorithms;
 257
 258                         /* clear this, it may get reset by
 259                          * send_server_key_exchange */
 260                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 261                                 s->s3->tmp.use_rsa_tmp=1;
 262                         else
 263                                 s->s3->tmp.use_rsa_tmp=0;
 264
 265                         /* only send if a DH key exchange, fortezza or
 266                          * RSA but we have a sign only certificate */
 267                         if (s->s3->tmp.use_rsa_tmp
 268                             || (l & (SSL_DH|SSL_kFZA))
 269                             || ((l & SSL_kRSA)
 270                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 271                                     || (SSL_IS_EXPORT(l)
 272                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_EXPORT_PKEYLENGTH(l)
 273                                         )
 274                                     )
 275                                 )
 276                             )
 277                                 {
 278                                 ret=ssl3_send_server_key_exchange(s);
 279                                 if (ret <= 0) goto end;
 280                                 }
 281                         else
 282                                 skip=1;
 283
 284                         s->state=SSL3_ST_SW_CERT_REQ_A;
 285                         s->init_num=0;
 286                         break;
 287
 288                 case SSL3_ST_SW_CERT_REQ_A:
 289                 case SSL3_ST_SW_CERT_REQ_B:
 290                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 291                                 ((s->session->peer != NULL) &&
 292                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 293                                 {
 294                                 /* no cert request */
 295                                 skip=1;
 296                                 s->s3->tmp.cert_request=0;
 297                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 298                                 }
 299                         else
 300                                 {
 301                                 s->s3->tmp.cert_request=1;
 302                                 ret=ssl3_send_certificate_request(s);
 303                                 if (ret <= 0) goto end;
 304                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 305                                 s->init_num=0;
 306                                 }
 307                         break;
 308
 309                 case SSL3_ST_SW_SRVR_DONE_A:
 310                 case SSL3_ST_SW_SRVR_DONE_B:
 311                         ret=ssl3_send_server_done(s);
 312                         if (ret <= 0) goto end;
 313                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 314                         s->state=SSL3_ST_SW_FLUSH;
 315                         s->init_num=0;
 316                         break;
 317
 318                 case SSL3_ST_SW_FLUSH:
 319                         /* number of bytes to be flushed */
 320                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 321                         if (num1 > 0)
 322                                 {
 323                                 s->rwstate=SSL_WRITING;
 324                                 num1=BIO_flush(s->wbio);
 325                                 if (num1 <= 0) { ret= -1; goto end; }
 326                                 s->rwstate=SSL_NOTHING;
 327                                 }
 328
 329                         s->state=s->s3->tmp.next_state;
 330                         break;
 331
 332                 case SSL3_ST_SR_CERT_A:
 333                 case SSL3_ST_SR_CERT_B:
 334                         /* could be sent for a DH cert, even if we
 335                          * have not asked for it :-) */
 336                         ret=ssl3_get_client_certificate(s);
 337                         if (ret <= 0) goto end;
 338                         s->init_num=0;
 339                         s->state=SSL3_ST_SR_KEY_EXCH_A;
 340                         break;
 341
 342                 case SSL3_ST_SR_KEY_EXCH_A:
 343                 case SSL3_ST_SR_KEY_EXCH_B:
 344                         ret=ssl3_get_client_key_exchange(s);
 345                         if (ret <= 0) goto end;
 346                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 347                         s->init_num=0;
 348
 349                         /* We need to get hashes here so if there is
 350                          * a client cert, it can be verified */
 351                         s->method->ssl3_enc->cert_verify_mac(s,
 352                                 &(s->s3->finish_dgst1),
 353                                 &(s->s3->tmp.finish_md[0]));
 354                         s->method->ssl3_enc->cert_verify_mac(s,
 355                                 &(s->s3->finish_dgst2),
 356                                 &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]));
 357
 358                         break;
 359
 360                 case SSL3_ST_SR_CERT_VRFY_A:
 361                 case SSL3_ST_SR_CERT_VRFY_B:
 362
 363                         /* we should decide if we expected this one */
 364                         ret=ssl3_get_cert_verify(s);
 365                         if (ret <= 0) goto end;
 366
 367                         s->state=SSL3_ST_SR_FINISHED_A;
 368                         s->init_num=0;
 369                         break;
 370
 371                 case SSL3_ST_SR_FINISHED_A:
 372                 case SSL3_ST_SR_FINISHED_B:
 373                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 374                                 SSL3_ST_SR_FINISHED_B);
 375                         if (ret <= 0) goto end;
 376                         if (s->hit)
 377                                 s->state=SSL_ST_OK;
 378                         else
 379                                 s->state=SSL3_ST_SW_CHANGE_A;
 380                         s->init_num=0;
 381                         break;
 382
 383                 case SSL3_ST_SW_CHANGE_A:
 384                 case SSL3_ST_SW_CHANGE_B:
 385
 386                         s->session->cipher=s->s3->tmp.new_cipher;
 387                         if (!s->method->ssl3_enc->setup_key_block(s))
 388                                 { ret= -1; goto end; }
 389
 390                         ret=ssl3_send_change_cipher_spec(s,
 391                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 392
 393                         if (ret <= 0) goto end;
 394                         s->state=SSL3_ST_SW_FINISHED_A;
 395                         s->init_num=0;
 396
 397                         if (!s->method->ssl3_enc->change_cipher_state(s,
 398                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 399                                 {
 400                                 ret= -1;
 401                                 goto end;
 402                                 }
 403
 404                         break;
 405
 406                 case SSL3_ST_SW_FINISHED_A:
 407                 case SSL3_ST_SW_FINISHED_B:
 408                         ret=ssl3_send_finished(s,
 409                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 410                                 s->method->ssl3_enc->server_finished,
 411                                 s->method->ssl3_enc->server_finished_len);
 412                         if (ret <= 0) goto end;
 413                         s->state=SSL3_ST_SW_FLUSH;
 414                         if (s->hit)
 415                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 416                         else
 417                                 s->s3->tmp.next_state=SSL_ST_OK;
 418                         s->init_num=0;
 419                         break;
 420
 421                 case SSL_ST_OK:
 422                         /* clean a few things up */
 423                         ssl3_cleanup_key_block(s);
 424
 425                         BUF_MEM_free(s->init_buf);
 426                         s->init_buf=NULL;
 427
 428                         /* remove buffering on output */
 429                         ssl_free_wbio_buffer(s);
 430
 431                         s->new_session=0;
 432                         s->init_num=0;
 433
 434                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 435
 436                         s->ctx->stats.sess_accept_good++;
 437                         /* s->server=1; */
 438                         s->handshake_func=ssl3_accept;
 439                         ret=1;
 440
 441                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 442
 443                         goto end;
 444                         /* break; */
 445
 446                 default:
 447                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 448                         ret= -1;
 449                         goto end;
 450                         /* break; */
 451                         }
 452
 453                 if (!s->s3->tmp.reuse_message && !skip)
 454                         {
 455                         if (s->debug)
 456                                 {
 457                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 458                                         goto end;
 459                                 }
 460
 461
 462                         if ((cb != NULL) && (s->state != state))
 463                                 {
 464                                 new_state=s->state;
 465                                 s->state=state;
 466                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 467                                 s->state=new_state;
 468                                 }
 469                         }
 470                 skip=0;
 471                 }
 472 end:
 473         /* BIO_flush(s->wbio); */
 474
 475         if (cb != NULL)
 476                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 477         s->in_handshake--;
 478         return(ret);
 479         }
 480
 481 static int ssl3_send_hello_request(SSL *s)
 482         {
 483         unsigned char *p;
 484
 485         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 486                 {
 487                 p=(unsigned char *)s->init_buf->data;
 488                 *(p++)=SSL3_MT_CLIENT_REQUEST;
 489                 *(p++)=0;
 490                 *(p++)=0;
 491                 *(p++)=0;
 492
 493                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 494                 /* number of bytes to write */
 495                 s->init_num=4;
 496                 s->init_off=0;
 497                 }
 498
 499         /* SSL3_ST_SW_HELLO_REQ_B */
 500         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 501         }
 502
 503 static int ssl3_get_client_hello(SSL *s)
 504         {
 505         int i,j,ok,al,ret= -1;
 506         long n;
 507         unsigned long id;
 508         unsigned char *p,*d,*q;
 509         SSL_CIPHER *c;
 510         SSL_COMP *comp=NULL;
 511         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 512
 513         /* We do this so that we will respond with our native type.
 514          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 515          * This down switching should be handled by a different method.
 516          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 517          * TLSv1.
 518          */
 519         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 520                 {
 521                 s->first_packet=1;
 522                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 523                 }
 524         n=ssl3_get_message(s,
 525                 SSL3_ST_SR_CLNT_HELLO_B,
 526                 SSL3_ST_SR_CLNT_HELLO_C,
 527                 SSL3_MT_CLIENT_HELLO,
 528                 SSL3_RT_MAX_PLAIN_LENGTH,
 529                 &ok);
 530
 531         if (!ok) return((int)n);
 532         d=p=(unsigned char *)s->init_buf->data;
 533
 534         /* The version number has already been checked in ssl3_get_message.
 535          * I a native TLSv1/SSLv3 method, the match must be correct except
 536          * perhaps for the first message */
 537 /*      s->client_version=(((int)p[0])<<8)|(int)p[1]; */
 538         p+=2;
 539
 540         /* load the client random */
 541         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 542         p+=SSL3_RANDOM_SIZE;
 543
 544         /* get the session-id */
 545         j= *(p++);
 546
 547         s->hit=0;
 548         if (j == 0)
 549                 {
 550                 if (!ssl_get_new_session(s,1))
 551                         goto err;
 552                 }
 553         else
 554                 {
 555                 i=ssl_get_prev_session(s,p,j);
 556                 if (i == 1)
 557                         { /* previous session */
 558                         s->hit=1;
 559                         }
 560                 else if (i == -1)
 561                         goto err;
 562                 else /* i == 0 */
 563                         {
 564                         if (!ssl_get_new_session(s,1))
 565                                 goto err;
 566                         }
 567                 }
 568
 569         p+=j;
 570         n2s(p,i);
 571         if ((i == 0) && (j != 0))
 572                 {
 573                 /* we need a cipher if we are not resuming a session */
 574                 al=SSL_AD_ILLEGAL_PARAMETER;
 575                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 576                 goto f_err;
 577                 }
 578         if ((i+p) > (d+n))
 579                 {
 580                 /* not enough data */
 581                 al=SSL_AD_DECODE_ERROR;
 582                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 583                 goto f_err;
 584                 }
 585         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 586                 == NULL))
 587                 {
 588                 goto err;
 589                 }
 590         p+=i;
 591
 592         /* If it is a hit, check that the cipher is in the list */
 593         if ((s->hit) && (i > 0))
 594                 {
 595                 j=0;
 596                 id=s->session->cipher->id;
 597
 598 #ifdef CIPHER_DEBUG
 599                 printf("client sent %d ciphers\n",sk_num(ciphers));
 600 #endif
 601                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 602                         {
 603                         c=sk_SSL_CIPHER_value(ciphers,i);
 604 #ifdef CIPHER_DEBUG
 605                         printf("client [%2d of %2d]:%s\n",
 606                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 607 #endif
 608                         if (c->id == id)
 609                                 {
 610                                 j=1;
 611                                 break;
 612                                 }
 613                         }
 614                 if (j == 0)
 615                         {
 616                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 617                                 {
 618                                 /* Very bad for multi-threading.... */
 619                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 620                                                                        0);
 621                                 }
 622                         else
 623                                 {
 624                                 /* we need to have the cipher in the cipher
 625                                  * list if we are asked to reuse it */
 626                                 al=SSL_AD_ILLEGAL_PARAMETER;
 627                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 628                                 goto f_err;
 629                                 }
 630                         }
 631                 }
 632
 633         /* compression */
 634         i= *(p++);
 635         q=p;
 636         for (j=0; j<i; j++)
 637                 {
 638                 if (p[j] == 0) break;
 639                 }
 640
 641         p+=i;
 642         if (j >= i)
 643                 {
 644                 /* no compress */
 645                 al=SSL_AD_DECODE_ERROR;
 646                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 647                 goto f_err;
 648                 }
 649
 650         /* Worst case, we will use the NULL compression, but if we have other
 651          * options, we will now look for them.  We have i-1 compression
 652          * algorithms from the client, starting at q. */
 653         s->s3->tmp.new_compression=NULL;
 654         if (s->ctx->comp_methods != NULL)
 655                 { /* See if we have a match */
 656                 int m,nn,o,v,done=0;
 657
 658                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 659                 for (m=0; m<nn; m++)
 660                         {
 661                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 662                         v=comp->id;
 663                         for (o=0; o<i; o++)
 664                                 {
 665                                 if (v == q[o])
 666                                         {
 667                                         done=1;
 668                                         break;
 669                                         }
 670                                 }
 671                         if (done) break;
 672                         }
 673                 if (done)
 674                         s->s3->tmp.new_compression=comp;
 675                 else
 676                         comp=NULL;
 677                 }
 678
 679         /* TLS does not mind if there is extra stuff */
 680         if (s->version == SSL3_VERSION)
 681                 {
 682                 if (p > (d+n))
 683                         {
 684                         /* wrong number of bytes,
 685                          * there could be more to follow */
 686                         al=SSL_AD_DECODE_ERROR;
 687                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 688                         goto f_err;
 689                         }
 690                 }
 691
 692         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 693          * pick a cipher */
 694
 695         if (!s->hit)
 696                 {
 697                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 698                 if (s->session->ciphers != NULL)
 699                         sk_SSL_CIPHER_free(s->session->ciphers);
 700                 s->session->ciphers=ciphers;
 701                 if (ciphers == NULL)
 702                         {
 703                         al=SSL_AD_ILLEGAL_PARAMETER;
 704                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 705                         goto f_err;
 706                         }
 707                 ciphers=NULL;
 708                 c=ssl3_choose_cipher(s,s->session->ciphers,
 709                                      ssl_get_ciphers_by_id(s));
 710
 711                 if (c == NULL)
 712                         {
 713                         al=SSL_AD_HANDSHAKE_FAILURE;
 714                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 715                         goto f_err;
 716                         }
 717                 s->s3->tmp.new_cipher=c;
 718                 }
 719         else
 720                 {
 721                 /* Session-id reuse */
 722 #ifdef REUSE_CIPHER_BUG
 723                 STACK_OF(SSL_CIPHER) *sk;
 724                 SSL_CIPHER *nc=NULL;
 725                 SSL_CIPHER *ec=NULL;
 726
 727                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 728                         {
 729                         sk=s->session->ciphers;
 730                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 731                                 {
 732                                 c=sk_SSL_CIPHER_value(sk,i);
 733                                 if (c->algorithms & SSL_eNULL)
 734                                         nc=c;
 735                                 if (SSL_C_IS_EXPORT(c))
 736                                         ec=c;
 737                                 }
 738                         if (nc != NULL)
 739                                 s->s3->tmp.new_cipher=nc;
 740                         else if (ec != NULL)
 741                                 s->s3->tmp.new_cipher=ec;
 742                         else
 743                                 s->s3->tmp.new_cipher=s->session->cipher;
 744                         }
 745                 else
 746 #endif
 747                 s->s3->tmp.new_cipher=s->session->cipher;
 748                 }
 749
 750         /* we now have the following setup.
 751          * client_random
 752          * cipher_list          - our prefered list of ciphers
 753          * ciphers              - the clients prefered list of ciphers
 754          * compression          - basically ignored right now
 755          * ssl version is set   - sslv3
 756          * s->session           - The ssl session has been setup.
 757          * s->hit               - sesson reuse flag
 758          * s->tmp.new_cipher    - the new cipher to use.
 759          */
 760
 761         ret=1;
 762         if (0)
 763                 {
 764 f_err:
 765                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 766                 }
 767 err:
 768         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 769         return(ret);
 770         }
 771
 772 static int ssl3_send_server_hello(SSL *s)
 773         {
 774         unsigned char *buf;
 775         unsigned char *p,*d;
 776         int i,sl;
 777         unsigned long l,Time;
 778
 779         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 780                 {
 781                 buf=(unsigned char *)s->init_buf->data;
 782                 p=s->s3->server_random;
 783                 Time=time(NULL);                        /* Time */
 784                 l2n(Time,p);
 785                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 786                 /* Do the message type and length last */
 787                 d=p= &(buf[4]);
 788
 789                 *(p++)=s->version>>8;
 790                 *(p++)=s->version&0xff;
 791
 792                 /* Random stuff */
 793                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 794                 p+=SSL3_RANDOM_SIZE;
 795
 796                 /* now in theory we have 3 options to sending back the
 797                  * session id.  If it is a re-use, we send back the
 798                  * old session-id, if it is a new session, we send
 799                  * back the new session-id or we send back a 0 length
 800                  * session-id if we want it to be single use.
 801                  * Currently I will not implement the '0' length session-id
 802                  * 12-Jan-98 - I'll now support the '0' length stuff.
 803                  */
 804                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 805                         s->session->session_id_length=0;
 806
 807                 sl=s->session->session_id_length;
 808                 *(p++)=sl;
 809                 memcpy(p,s->session->session_id,sl);
 810                 p+=sl;
 811
 812                 /* put the cipher */
 813                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 814                 p+=i;
 815
 816                 /* put the compression method */
 817                 if (s->s3->tmp.new_compression == NULL)
 818                         *(p++)=0;
 819                 else
 820                         *(p++)=s->s3->tmp.new_compression->id;
 821
 822                 /* do the header */
 823                 l=(p-d);
 824                 d=buf;
 825                 *(d++)=SSL3_MT_SERVER_HELLO;
 826                 l2n3(l,d);
 827
 828                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 829                 /* number of bytes to write */
 830                 s->init_num=p-buf;
 831                 s->init_off=0;
 832                 }
 833
 834         /* SSL3_ST_CW_CLNT_HELLO_B */
 835         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 836         }
 837
 838 static int ssl3_send_server_done(SSL *s)
 839         {
 840         unsigned char *p;
 841
 842         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 843                 {
 844                 p=(unsigned char *)s->init_buf->data;
 845
 846                 /* do the header */
 847                 *(p++)=SSL3_MT_SERVER_DONE;
 848                 *(p++)=0;
 849                 *(p++)=0;
 850                 *(p++)=0;
 851
 852                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 853                 /* number of bytes to write */
 854                 s->init_num=4;
 855                 s->init_off=0;
 856                 }
 857
 858         /* SSL3_ST_CW_CLNT_HELLO_B */
 859         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 860         }
 861
 862 static int ssl3_send_server_key_exchange(SSL *s)
 863         {
 864 #ifndef NO_RSA
 865         unsigned char *q;
 866         int j,num;
 867         RSA *rsa;
 868         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 869 #endif
 870 #ifndef NO_DH
 871         DH *dh,*dhp;
 872 #endif
 873         EVP_PKEY *pkey;
 874         unsigned char *p,*d;
 875         int al,i;
 876         unsigned long type;
 877         int n;
 878         CERT *cert;
 879         BIGNUM *r[4];
 880         int nr[4],kn;
 881         BUF_MEM *buf;
 882         EVP_MD_CTX md_ctx;
 883
 884         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 885                 {
 886                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 887                 cert=s->cert;
 888
 889                 buf=s->init_buf;
 890
 891                 r[0]=r[1]=r[2]=r[3]=NULL;
 892                 n=0;
 893 #ifndef NO_RSA
 894                 if (type & SSL_kRSA)
 895                         {
 896                         rsa=cert->rsa_tmp;
 897                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 898                                 {
 899                                 rsa=s->cert->rsa_tmp_cb(s,
 900                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 901                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 902                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 903                                 cert->rsa_tmp=rsa;
 904                                 }
 905                         if (rsa == NULL)
 906                                 {
 907                                 al=SSL_AD_HANDSHAKE_FAILURE;
 908                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 909                                 goto f_err;
 910                                 }
 911                         r[0]=rsa->n;
 912                         r[1]=rsa->e;
 913                         s->s3->tmp.use_rsa_tmp=1;
 914                         }
 915                 else
 916 #endif
 917 #ifndef NO_DH
 918                         if (type & SSL_kEDH)
 919                         {
 920                         dhp=cert->dh_tmp;
 921                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 922                                 dhp=s->cert->dh_tmp_cb(s,
 923                                       !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 924                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 925                         if (dhp == NULL)
 926                                 {
 927                                 al=SSL_AD_HANDSHAKE_FAILURE;
 928                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 929                                 goto f_err;
 930                                 }
 931                         if ((dh=DHparams_dup(dhp)) == NULL)
 932                                 {
 933                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 934                                 goto err;
 935                                 }
 936
 937                         s->s3->tmp.dh=dh;
 938                         if ((dhp->pub_key == NULL ||
 939                              dhp->priv_key == NULL ||
 940                              (s->options & SSL_OP_SINGLE_DH_USE)))
 941                                 {
 942                                 if(!DH_generate_key(dh))
 943                                     {
 944                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
 945                                            ERR_R_DH_LIB);
 946                                     goto err;
 947                                     }
 948                                 }
 949                         else
 950                                 {
 951                                 dh->pub_key=BN_dup(dhp->pub_key);
 952                                 dh->priv_key=BN_dup(dhp->priv_key);
 953                                 if ((dh->pub_key == NULL) ||
 954                                         (dh->priv_key == NULL))
 955                                         {
 956                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 957                                         goto err;
 958                                         }
 959                                 }
 960                         r[0]=dh->p;
 961                         r[1]=dh->g;
 962                         r[2]=dh->pub_key;
 963                         }
 964                 else
 965 #endif
 966                         {
 967                         al=SSL_AD_HANDSHAKE_FAILURE;
 968                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 969                         goto f_err;
 970                         }
 971                 for (i=0; r[i] != NULL; i++)
 972                         {
 973                         nr[i]=BN_num_bytes(r[i]);
 974                         n+=2+nr[i];
 975                         }
 976
 977                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 978                         {
 979                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 980                                 == NULL)
 981                                 {
 982                                 al=SSL_AD_DECODE_ERROR;
 983                                 goto f_err;
 984                                 }
 985                         kn=EVP_PKEY_size(pkey);
 986                         }
 987                 else
 988                         {
 989                         pkey=NULL;
 990                         kn=0;
 991                         }
 992
 993                 if (!BUF_MEM_grow(buf,n+4+kn))
 994                         {
 995                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 996                         goto err;
 997                         }
 998                 d=(unsigned char *)s->init_buf->data;
 999                 p= &(d[4]);
1000
1001                 for (i=0; r[i] != NULL; i++)
1002                         {
1003                         s2n(nr[i],p);
1004                         BN_bn2bin(r[i],p);
1005                         p+=nr[i];
1006                         }
1007
1008                 /* not anonymous */
1009                 if (pkey != NULL)
1010                         {
1011                         /* n is the length of the params, they start at &(d[4])
1012                          * and p points to the space at the end. */
1013 #ifndef NO_RSA
1014                         if (pkey->type == EVP_PKEY_RSA)
1015                                 {
1016                                 q=md_buf;
1017                                 j=0;
1018                                 for (num=2; num > 0; num--)
1019                                         {
1020                                         EVP_DigestInit(&md_ctx,(num == 2)
1021                                                 ?s->ctx->md5:s->ctx->sha1);
1022                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1023                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1024                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1025                                         EVP_DigestFinal(&md_ctx,q,
1026                                                 (unsigned int *)&i);
1027                                         q+=i;
1028                                         j+=i;
1029                                         }
1030                                 i=RSA_private_encrypt(j,md_buf,&(p[2]),
1031                                         pkey->pkey.rsa,RSA_PKCS1_PADDING);
1032                                 if (i <= 0)
1033                                         {
1034                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1035                                         goto err;
1036                                         }
1037                                 s2n(i,p);
1038                                 n+=i+2;
1039                                 }
1040                         else
1041 #endif
1042 #if !defined(NO_DSA)
1043                                 if (pkey->type == EVP_PKEY_DSA)
1044                                 {
1045                                 /* lets do DSS */
1046                                 EVP_SignInit(&md_ctx,EVP_dss1());
1047                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1048                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1049                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1050                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1051                                         (unsigned int *)&i,pkey))
1052                                         {
1053                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1054                                         goto err;
1055                                         }
1056                                 s2n(i,p);
1057                                 n+=i+2;
1058                                 }
1059                         else
1060 #endif
1061                                 {
1062                                 /* Is this error check actually needed? */
1063                                 al=SSL_AD_HANDSHAKE_FAILURE;
1064                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1065                                 goto f_err;
1066                                 }
1067                         }
1068
1069                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1070                 l2n3(n,d);
1071
1072                 /* we should now have things packed up, so lets send
1073                  * it off */
1074                 s->init_num=n+4;
1075                 s->init_off=0;
1076                 }
1077
1078         /* SSL3_ST_SW_KEY_EXCH_B */
1079         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1080 f_err:
1081         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1082 err:
1083         return(-1);
1084         }
1085
1086 static int ssl3_send_certificate_request(SSL *s)
1087         {
1088         unsigned char *p,*d;
1089         int i,j,nl,off,n;
1090         STACK_OF(X509_NAME) *sk=NULL;
1091         X509_NAME *name;
1092         BUF_MEM *buf;
1093
1094         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1095                 {
1096                 buf=s->init_buf;
1097
1098                 d=p=(unsigned char *)&(buf->data[4]);
1099
1100                 /* get the list of acceptable cert types */
1101                 p++;
1102                 n=ssl3_get_req_cert_type(s,p);
1103                 d[0]=n;
1104                 p+=n;
1105                 n++;
1106
1107                 off=n;
1108                 p+=2;
1109                 n+=2;
1110
1111                 sk=SSL_get_client_CA_list(s);
1112                 nl=0;
1113                 if (sk != NULL)
1114                         {
1115                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1116                                 {
1117                                 name=sk_X509_NAME_value(sk,i);
1118                                 j=i2d_X509_NAME(name,NULL);
1119                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1120                                         {
1121                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1122                                         goto err;
1123                                         }
1124                                 p=(unsigned char *)&(buf->data[4+n]);
1125                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1126                                         {
1127                                         s2n(j,p);
1128                                         i2d_X509_NAME(name,&p);
1129                                         n+=2+j;
1130                                         nl+=2+j;
1131                                         }
1132                                 else
1133                                         {
1134                                         d=p;
1135                                         i2d_X509_NAME(name,&p);
1136                                         j-=2; s2n(j,d); j+=2;
1137                                         n+=j;
1138                                         nl+=j;
1139                                         }
1140                                 }
1141                         }
1142                 /* else no CA names */
1143                 p=(unsigned char *)&(buf->data[4+off]);
1144                 s2n(nl,p);
1145
1146                 d=(unsigned char *)buf->data;
1147                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1148                 l2n3(n,d);
1149
1150                 /* we should now have things packed up, so lets send
1151                  * it off */
1152
1153                 s->init_num=n+4;
1154                 s->init_off=0;
1155                 }
1156
1157         /* SSL3_ST_SW_CERT_REQ_B */
1158         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1159 err:
1160         return(-1);
1161         }
1162
1163 static int ssl3_get_client_key_exchange(SSL *s)
1164         {
1165         int i,al,ok;
1166         long n;
1167         unsigned long l;
1168         unsigned char *p;
1169 #ifndef NO_RSA
1170         RSA *rsa=NULL;
1171         EVP_PKEY *pkey=NULL;
1172 #endif
1173 #ifndef NO_DH
1174         BIGNUM *pub=NULL;
1175         DH *dh_srvr;
1176 #endif
1177
1178         n=ssl3_get_message(s,
1179                 SSL3_ST_SR_KEY_EXCH_A,
1180                 SSL3_ST_SR_KEY_EXCH_B,
1181                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1182                 400, /* ???? */
1183                 &ok);
1184
1185         if (!ok) return((int)n);
1186         p=(unsigned char *)s->init_buf->data;
1187
1188         l=s->s3->tmp.new_cipher->algorithms;
1189
1190 #ifndef NO_RSA
1191         if (l & SSL_kRSA)
1192                 {
1193                 /* FIX THIS UP EAY EAY EAY EAY */
1194                 if (s->s3->tmp.use_rsa_tmp)
1195                         {
1196                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1197                                 rsa=s->cert->rsa_tmp;
1198                         /* Don't do a callback because rsa_tmp should
1199                          * be sent already */
1200                         if (rsa == NULL)
1201                                 {
1202                                 al=SSL_AD_HANDSHAKE_FAILURE;
1203                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1204                                 goto f_err;
1205
1206                                 }
1207                         }
1208                 else
1209                         {
1210                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1211                         if (    (pkey == NULL) ||
1212                                 (pkey->type != EVP_PKEY_RSA) ||
1213                                 (pkey->pkey.rsa == NULL))
1214                                 {
1215                                 al=SSL_AD_HANDSHAKE_FAILURE;
1216                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1217                                 goto f_err;
1218                                 }
1219                         rsa=pkey->pkey.rsa;
1220                         }
1221
1222                 /* TLS */
1223                 if (s->version > SSL3_VERSION)
1224                         {
1225                         n2s(p,i);
1226                         if (n != i+2)
1227                                 {
1228                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1229                                         {
1230                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1231                                         goto err;
1232                                         }
1233                                 else
1234                                         p-=2;
1235                                 }
1236                         else
1237                                 n=i;
1238                         }
1239
1240                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1241
1242 #if 1
1243                 /* If a bad decrypt, use a random master key */
1244                 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1245                         ((p[0] != (s->client_version>>8)) ||
1246                          (p[1] != (s->client_version & 0xff))))
1247                         {
1248                         int bad=1;
1249
1250                         if ((i == SSL_MAX_MASTER_KEY_LENGTH) &&
1251                                 (p[0] == (s->version>>8)) &&
1252                                 (p[1] == 0))
1253                                 {
1254                                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
1255                                         bad=0;
1256                                 }
1257                         if (bad)
1258                                 {
1259                                 p[0]=(s->version>>8);
1260                                 p[1]=(s->version & 0xff);
1261                                 RAND_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1262                                 i=SSL_MAX_MASTER_KEY_LENGTH;
1263                                 }
1264                         /* else, an SSLeay bug, ssl only server, tls client */
1265                         }
1266 #else
1267                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1268                         {
1269                         al=SSL_AD_DECODE_ERROR;
1270                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1271                         goto f_err;
1272                         }
1273
1274                 if ((p[0] != (s->version>>8)) || (p[1] != (s->version & 0xff)))
1275                         {
1276                         al=SSL_AD_DECODE_ERROR;
1277                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1278                         goto f_err;
1279                         }
1280 #endif
1281
1282                 s->session->master_key_length=
1283                         s->method->ssl3_enc->generate_master_secret(s,
1284                                 s->session->master_key,
1285                                 p,i);
1286                 memset(p,0,i);
1287                 }
1288         else
1289 #endif
1290 #ifndef NO_DH
1291                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1292                 {
1293                 n2s(p,i);
1294                 if (n != i+2)
1295                         {
1296                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1297                                 {
1298                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1299                                 goto err;
1300                                 }
1301                         else
1302                                 {
1303                                 p-=2;
1304                                 i=(int)n;
1305                                 }
1306                         }
1307
1308                 if (n == 0L) /* the parameters are in the cert */
1309                         {
1310                         al=SSL_AD_HANDSHAKE_FAILURE;
1311                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1312                         goto f_err;
1313                         }
1314                 else
1315                         {
1316                         if (s->s3->tmp.dh == NULL)
1317                                 {
1318                                 al=SSL_AD_HANDSHAKE_FAILURE;
1319                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1320                                 goto f_err;
1321                                 }
1322                         else
1323                                 dh_srvr=s->s3->tmp.dh;
1324                         }
1325
1326                 pub=BN_bin2bn(p,i,NULL);
1327                 if (pub == NULL)
1328                         {
1329                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1330                         goto err;
1331                         }
1332
1333                 i=DH_compute_key(p,pub,dh_srvr);
1334
1335                 if (i <= 0)
1336                         {
1337                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1338                         goto err;
1339                         }
1340
1341                 DH_free(s->s3->tmp.dh);
1342                 s->s3->tmp.dh=NULL;
1343
1344                 BN_clear_free(pub);
1345                 pub=NULL;
1346                 s->session->master_key_length=
1347                         s->method->ssl3_enc->generate_master_secret(s,
1348                                 s->session->master_key,p,i);
1349                 }
1350         else
1351 #endif
1352                 {
1353                 al=SSL_AD_HANDSHAKE_FAILURE;
1354                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1355                 goto f_err;
1356                 }
1357
1358         return(1);
1359 f_err:
1360         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1361 #if !defined(NO_DH) || !defined(NO_RSA)
1362 err:
1363 #endif
1364         return(-1);
1365         }
1366
1367 static int ssl3_get_cert_verify(SSL *s)
1368         {
1369         EVP_PKEY *pkey=NULL;
1370         unsigned char *p;
1371         int al,ok,ret=0;
1372         long n;
1373         int type=0,i,j;
1374         X509 *peer;
1375
1376         n=ssl3_get_message(s,
1377                 SSL3_ST_SR_CERT_VRFY_A,
1378                 SSL3_ST_SR_CERT_VRFY_B,
1379                 -1,
1380                 512, /* 512? */
1381                 &ok);
1382
1383         if (!ok) return((int)n);
1384
1385         if (s->session->peer != NULL)
1386                 {
1387                 peer=s->session->peer;
1388                 pkey=X509_get_pubkey(peer);
1389                 type=X509_certificate_type(peer,pkey);
1390                 }
1391         else
1392                 {
1393                 peer=NULL;
1394                 pkey=NULL;
1395                 }
1396
1397         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1398                 {
1399                 s->s3->tmp.reuse_message=1;
1400                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1401                         {
1402                         al=SSL_AD_UNEXPECTED_MESSAGE;
1403                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1404                         goto f_err;
1405                         }
1406                 ret=1;
1407                 goto end;
1408                 }
1409
1410         if (peer == NULL)
1411                 {
1412                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1413                 al=SSL_AD_UNEXPECTED_MESSAGE;
1414                 goto f_err;
1415                 }
1416
1417         if (!(type & EVP_PKT_SIGN))
1418                 {
1419                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1420                 al=SSL_AD_ILLEGAL_PARAMETER;
1421                 goto f_err;
1422                 }
1423
1424         if (s->s3->change_cipher_spec)
1425                 {
1426                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1427                 al=SSL_AD_UNEXPECTED_MESSAGE;
1428                 goto f_err;
1429                 }
1430
1431         /* we now have a signature that we need to verify */
1432         p=(unsigned char *)s->init_buf->data;
1433         n2s(p,i);
1434         n-=2;
1435         if (i > n)
1436                 {
1437                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1438                 al=SSL_AD_DECODE_ERROR;
1439                 goto f_err;
1440                 }
1441
1442         j=EVP_PKEY_size(pkey);
1443         if ((i > j) || (n > j) || (n <= 0))
1444                 {
1445                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1446                 al=SSL_AD_DECODE_ERROR;
1447                 goto f_err;
1448                 }
1449
1450 #ifndef NO_RSA
1451         if (pkey->type == EVP_PKEY_RSA)
1452                 {
1453                 i=RSA_public_decrypt(i,p,p,pkey->pkey.rsa,RSA_PKCS1_PADDING);
1454                 if (i < 0)
1455                         {
1456                         al=SSL_AD_DECRYPT_ERROR;
1457                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1458                         goto f_err;
1459                         }
1460                 if ((i != (MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH)) ||
1461                         memcmp(&(s->s3->tmp.finish_md[0]),p,
1462                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH))
1463                         {
1464                         al=SSL_AD_DECRYPT_ERROR;
1465                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1466                         goto f_err;
1467                         }
1468                 }
1469         else
1470 #endif
1471 #ifndef NO_DSA
1472                 if (pkey->type == EVP_PKEY_DSA)
1473                 {
1474                 j=DSA_verify(pkey->save_type,
1475                         &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]),
1476                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1477                 if (j <= 0)
1478                         {
1479                         /* bad signature */
1480                         al=SSL_AD_DECRYPT_ERROR;
1481                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1482                         goto f_err;
1483                         }
1484                 }
1485         else
1486 #endif
1487                 {
1488                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1489                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1490                 goto f_err;
1491                 }
1492
1493
1494         ret=1;
1495         if (0)
1496                 {
1497 f_err:
1498                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1499                 }
1500 end:
1501         EVP_PKEY_free(pkey);
1502         return(ret);
1503         }
1504
1505 static int ssl3_get_client_certificate(SSL *s)
1506         {
1507         int i,ok,al,ret= -1;
1508         X509 *x=NULL;
1509         unsigned long l,nc,llen,n;
1510         unsigned char *p,*d,*q;
1511         STACK_OF(X509) *sk=NULL;
1512
1513         n=ssl3_get_message(s,
1514                 SSL3_ST_SR_CERT_A,
1515                 SSL3_ST_SR_CERT_B,
1516                 -1,
1517 #if defined(MSDOS) && !defined(WIN32)
1518                 1024*30, /* 30k max cert list :-) */
1519 #else
1520                 1024*100, /* 100k max cert list :-) */
1521 #endif
1522                 &ok);
1523
1524         if (!ok) return((int)n);
1525
1526         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1527                 {
1528                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1529                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1530                         {
1531                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1532                         al=SSL_AD_HANDSHAKE_FAILURE;
1533                         goto f_err;
1534                         }
1535                 /* If tls asked for a client cert we must return a 0 list */
1536                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1537                         {
1538                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1539                         al=SSL_AD_UNEXPECTED_MESSAGE;
1540                         goto f_err;
1541                         }
1542                 s->s3->tmp.reuse_message=1;
1543                 return(1);
1544                 }
1545
1546         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1547                 {
1548                 al=SSL_AD_UNEXPECTED_MESSAGE;
1549                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1550                 goto f_err;
1551                 }
1552         d=p=(unsigned char *)s->init_buf->data;
1553
1554         if ((sk=sk_X509_new_null()) == NULL)
1555                 {
1556                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1557                 goto err;
1558                 }
1559
1560         n2l3(p,llen);
1561         if (llen+3 != n)
1562                 {
1563                 al=SSL_AD_DECODE_ERROR;
1564                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1565                 goto f_err;
1566                 }
1567         for (nc=0; nc<llen; )
1568                 {
1569                 n2l3(p,l);
1570                 if ((l+nc+3) > llen)
1571                         {
1572                         al=SSL_AD_DECODE_ERROR;
1573                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1574                         goto f_err;
1575                         }
1576
1577                 q=p;
1578                 x=d2i_X509(NULL,&p,l);
1579                 if (x == NULL)
1580                         {
1581                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1582                         goto err;
1583                         }
1584                 if (p != (q+l))
1585                         {
1586                         al=SSL_AD_DECODE_ERROR;
1587                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1588                         goto f_err;
1589                         }
1590                 if (!sk_X509_push(sk,x))
1591                         {
1592                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1593                         goto err;
1594                         }
1595                 x=NULL;
1596                 nc+=l+3;
1597                 }
1598
1599         if (sk_X509_num(sk) <= 0)
1600                 {
1601                 /* TLS does not mind 0 certs returned */
1602                 if (s->version == SSL3_VERSION)
1603                         {
1604                         al=SSL_AD_HANDSHAKE_FAILURE;
1605                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1606                         goto f_err;
1607                         }
1608                 /* Fail for TLS only if we required a certificate */
1609                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1610                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1611                         {
1612                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1613                         al=SSL_AD_HANDSHAKE_FAILURE;
1614                         goto f_err;
1615                         }
1616                 }
1617         else
1618                 {
1619                 i=ssl_verify_cert_chain(s,sk);
1620                 if (!i)
1621                         {
1622                         al=ssl_verify_alarm_type(s->verify_result);
1623                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1624                         goto f_err;
1625                         }
1626                 }
1627
1628         if (s->session->peer != NULL) /* This should not be needed */
1629                 X509_free(s->session->peer);
1630         s->session->peer=sk_X509_shift(sk);
1631
1632         /* With the current implementation, sess_cert will always be NULL
1633          * when we arrive here. */
1634         if (s->session->sess_cert == NULL)
1635                 {
1636                 s->session->sess_cert = ssl_sess_cert_new();
1637                 if (s->session->sess_cert == NULL)
1638                         {
1639                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1640                         goto err;
1641                         }
1642                 }
1643         if (s->session->sess_cert->cert_chain != NULL)
1644                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1645         s->session->sess_cert->cert_chain=sk;
1646
1647         sk=NULL;
1648
1649         ret=1;
1650         if (0)
1651                 {
1652 f_err:
1653                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1654                 }
1655 err:
1656         if (x != NULL) X509_free(x);
1657         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1658         return(ret);
1659         }
1660
1661 int ssl3_send_server_certificate(SSL *s)
1662         {
1663         unsigned long l;
1664         X509 *x;
1665
1666         if (s->state == SSL3_ST_SW_CERT_A)
1667                 {
1668                 x=ssl_get_server_send_cert(s);
1669                 if (x == NULL)
1670                         {
1671                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1672                         return(0);
1673                         }
1674
1675                 l=ssl3_output_cert_chain(s,x);
1676                 s->state=SSL3_ST_SW_CERT_B;
1677                 s->init_num=(int)l;
1678                 s->init_off=0;
1679                 }
1680
1681         /* SSL3_ST_SW_CERT_B */
1682         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1683         }