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         CERT *ct;
 114         int new_state,state,skip=0;
 115
 116         RAND_seed(&Time,sizeof(Time));
 117         ERR_clear_error();
 118         clear_sys_error();
 119
 120         if (s->info_callback != NULL)
 121                 cb=s->info_callback;
 122         else if (s->ctx->info_callback != NULL)
 123                 cb=s->ctx->info_callback;
 124
 125         /* init things to blank */
 126         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 127         s->in_handshake++;
 128
 129 #ifdef undef
 130         /* FIX THIS EAY EAY EAY */
 131         /* we don't actually need a cert, we just need a cert or a DH_tmp */
 132         if (((s->session == NULL) || (s->session->sess_cert == NULL)) &&
 133                 (s->cert == NULL))
 134                 {
 135                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 136                 ret= -1;
 137                 goto end;
 138                 }
 139 #endif
 140
 141         for (;;)
 142                 {
 143                 state=s->state;
 144
 145                 switch (s->state)
 146                         {
 147                 case SSL_ST_RENEGOTIATE:
 148                         s->new_session=1;
 149                         /* s->state=SSL_ST_ACCEPT; */
 150
 151                 case SSL_ST_BEFORE:
 152                 case SSL_ST_ACCEPT:
 153                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 154                 case SSL_ST_OK|SSL_ST_ACCEPT:
 155
 156                         s->server=1;
 157                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 158
 159                         if ((s->version>>8) != 3)
 160                                 abort();
 161                         /* s->version=SSL3_VERSION; */
 162                         s->type=SSL_ST_ACCEPT;
 163
 164                         if (s->init_buf == NULL)
 165                                 {
 166                                 if ((buf=BUF_MEM_new()) == NULL)
 167                                         {
 168                                         ret= -1;
 169                                         goto end;
 170                                         }
 171                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 172                                         {
 173                                         ret= -1;
 174                                         goto end;
 175                                         }
 176                                 s->init_buf=buf;
 177                                 }
 178
 179                         if (!ssl3_setup_buffers(s))
 180                                 {
 181                                 ret= -1;
 182                                 goto end;
 183                                 }
 184
 185                         /* Ok, we now need to push on a buffering BIO so that
 186                          * the output is sent in a way that TCP likes :-)
 187                          */
 188                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 189
 190                         s->init_num=0;
 191
 192                         if (s->state != SSL_ST_RENEGOTIATE)
 193                                 {
 194                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 195                                 ssl3_init_finished_mac(s);
 196                                 s->ctx->stats.sess_accept++;
 197                                 }
 198                         else
 199                                 {
 200                                 s->ctx->stats.sess_accept_renegotiate++;
 201                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 202                                 }
 203                         break;
 204
 205                 case SSL3_ST_SW_HELLO_REQ_A:
 206                 case SSL3_ST_SW_HELLO_REQ_B:
 207
 208                         s->shutdown=0;
 209                         ret=ssl3_send_hello_request(s);
 210                         if (ret <= 0) goto end;
 211                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 212                         s->state=SSL3_ST_SW_FLUSH;
 213                         s->init_num=0;
 214
 215                         ssl3_init_finished_mac(s);
 216                         break;
 217
 218                 case SSL3_ST_SW_HELLO_REQ_C:
 219                         s->state=SSL_ST_OK;
 220                         ret=1;
 221                         goto end;
 222                         /* break; */
 223
 224                 case SSL3_ST_SR_CLNT_HELLO_A:
 225                 case SSL3_ST_SR_CLNT_HELLO_B:
 226                 case SSL3_ST_SR_CLNT_HELLO_C:
 227
 228                         s->shutdown=0;
 229                         ret=ssl3_get_client_hello(s);
 230                         if (ret <= 0) goto end;
 231                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 232                         s->init_num=0;
 233                         break;
 234
 235                 case SSL3_ST_SW_SRVR_HELLO_A:
 236                 case SSL3_ST_SW_SRVR_HELLO_B:
 237                         ret=ssl3_send_server_hello(s);
 238                         if (ret <= 0) goto end;
 239
 240                         if (s->hit)
 241                                 s->state=SSL3_ST_SW_CHANGE_A;
 242                         else
 243                                 s->state=SSL3_ST_SW_CERT_A;
 244                         s->init_num=0;
 245                         break;
 246
 247                 case SSL3_ST_SW_CERT_A:
 248                 case SSL3_ST_SW_CERT_B:
 249                         /* Check if it is anon DH */
 250                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 251                                 {
 252                                 ret=ssl3_send_server_certificate(s);
 253                                 if (ret <= 0) goto end;
 254                                 }
 255                         else
 256                                 skip=1;
 257                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 258                         s->init_num=0;
 259                         break;
 260
 261                 case SSL3_ST_SW_KEY_EXCH_A:
 262                 case SSL3_ST_SW_KEY_EXCH_B:
 263                         l=s->s3->tmp.new_cipher->algorithms;
 264                         if (s->session->sess_cert == NULL)
 265                                 {
 266                                 if (s->cert != NULL)
 267                                         {
 268                                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 269                                         s->session->sess_cert=s->cert;
 270                                         }
 271                                 }
 272                         ct=s->session->sess_cert;
 273
 274                         /* clear this, it may get reset by
 275                          * send_server_key_exchange */
 276                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 277                                 s->s3->tmp.use_rsa_tmp=1;
 278                         else
 279                                 s->s3->tmp.use_rsa_tmp=0;
 280
 281                         /* only send if a DH key exchange, fortezza or
 282                          * RSA but we have a sign only certificate */
 283                         if (s->s3->tmp.use_rsa_tmp
 284                             || (l & (SSL_DH|SSL_kFZA))
 285                             || ((l & SSL_kRSA)
 286                                 && (ct->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 287                                     || (SSL_IS_EXPORT(l)
 288                                         && EVP_PKEY_size(ct->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_EXPORT_PKEYLENGTH(l)
 289                                         )
 290                                     )
 291                                 )
 292                             )
 293                                 {
 294                                 ret=ssl3_send_server_key_exchange(s);
 295                                 if (ret <= 0) goto end;
 296                                 }
 297                         else
 298                                 skip=1;
 299
 300                         s->state=SSL3_ST_SW_CERT_REQ_A;
 301                         s->init_num=0;
 302                         break;
 303
 304                 case SSL3_ST_SW_CERT_REQ_A:
 305                 case SSL3_ST_SW_CERT_REQ_B:
 306                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 307                                 ((s->session->peer != NULL) &&
 308                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 309                                 {
 310                                 /* no cert request */
 311                                 skip=1;
 312                                 s->s3->tmp.cert_request=0;
 313                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 314                                 }
 315                         else
 316                                 {
 317                                 s->s3->tmp.cert_request=1;
 318                                 ret=ssl3_send_certificate_request(s);
 319                                 if (ret <= 0) goto end;
 320                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 321                                 s->init_num=0;
 322                                 }
 323                         break;
 324
 325                 case SSL3_ST_SW_SRVR_DONE_A:
 326                 case SSL3_ST_SW_SRVR_DONE_B:
 327                         ret=ssl3_send_server_done(s);
 328                         if (ret <= 0) goto end;
 329                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 330                         s->state=SSL3_ST_SW_FLUSH;
 331                         s->init_num=0;
 332                         break;
 333
 334                 case SSL3_ST_SW_FLUSH:
 335                         /* number of bytes to be flushed */
 336                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 337                         if (num1 > 0)
 338                                 {
 339                                 s->rwstate=SSL_WRITING;
 340                                 num1=BIO_flush(s->wbio);
 341                                 if (num1 <= 0) { ret= -1; goto end; }
 342                                 s->rwstate=SSL_NOTHING;
 343                                 }
 344
 345                         s->state=s->s3->tmp.next_state;
 346                         break;
 347
 348                 case SSL3_ST_SR_CERT_A:
 349                 case SSL3_ST_SR_CERT_B:
 350                         /* could be sent for a DH cert, even if we
 351                          * have not asked for it :-) */
 352                         ret=ssl3_get_client_certificate(s);
 353                         if (ret <= 0) goto end;
 354                         s->init_num=0;
 355                         s->state=SSL3_ST_SR_KEY_EXCH_A;
 356                         break;
 357
 358                 case SSL3_ST_SR_KEY_EXCH_A:
 359                 case SSL3_ST_SR_KEY_EXCH_B:
 360                         ret=ssl3_get_client_key_exchange(s);
 361                         if (ret <= 0) goto end;
 362                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 363                         s->init_num=0;
 364
 365                         /* We need to get hashes here so if there is
 366                          * a client cert, it can be verified */
 367                         s->method->ssl3_enc->cert_verify_mac(s,
 368                                 &(s->s3->finish_dgst1),
 369                                 &(s->s3->tmp.finish_md[0]));
 370                         s->method->ssl3_enc->cert_verify_mac(s,
 371                                 &(s->s3->finish_dgst2),
 372                                 &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]));
 373
 374                         break;
 375
 376                 case SSL3_ST_SR_CERT_VRFY_A:
 377                 case SSL3_ST_SR_CERT_VRFY_B:
 378
 379                         /* we should decide if we expected this one */
 380                         ret=ssl3_get_cert_verify(s);
 381                         if (ret <= 0) goto end;
 382
 383                         s->state=SSL3_ST_SR_FINISHED_A;
 384                         s->init_num=0;
 385                         break;
 386
 387                 case SSL3_ST_SR_FINISHED_A:
 388                 case SSL3_ST_SR_FINISHED_B:
 389                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 390                                 SSL3_ST_SR_FINISHED_B);
 391                         if (ret <= 0) goto end;
 392                         if (s->hit)
 393                                 s->state=SSL_ST_OK;
 394                         else
 395                                 s->state=SSL3_ST_SW_CHANGE_A;
 396                         s->init_num=0;
 397                         break;
 398
 399                 case SSL3_ST_SW_CHANGE_A:
 400                 case SSL3_ST_SW_CHANGE_B:
 401
 402                         s->session->cipher=s->s3->tmp.new_cipher;
 403                         if (!s->method->ssl3_enc->setup_key_block(s))
 404                                 { ret= -1; goto end; }
 405
 406                         ret=ssl3_send_change_cipher_spec(s,
 407                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 408
 409                         if (ret <= 0) goto end;
 410                         s->state=SSL3_ST_SW_FINISHED_A;
 411                         s->init_num=0;
 412
 413                         if (!s->method->ssl3_enc->change_cipher_state(s,
 414                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 415                                 {
 416                                 ret= -1;
 417                                 goto end;
 418                                 }
 419
 420                         break;
 421
 422                 case SSL3_ST_SW_FINISHED_A:
 423                 case SSL3_ST_SW_FINISHED_B:
 424                         ret=ssl3_send_finished(s,
 425                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 426                                 s->method->ssl3_enc->server_finished,
 427                                 s->method->ssl3_enc->server_finished_len);
 428                         if (ret <= 0) goto end;
 429                         s->state=SSL3_ST_SW_FLUSH;
 430                         if (s->hit)
 431                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 432                         else
 433                                 s->s3->tmp.next_state=SSL_ST_OK;
 434                         s->init_num=0;
 435                         break;
 436
 437                 case SSL_ST_OK:
 438                         /* clean a few things up */
 439                         ssl3_cleanup_key_block(s);
 440
 441                         BUF_MEM_free(s->init_buf);
 442                         s->init_buf=NULL;
 443
 444                         /* remove buffering on output */
 445                         ssl_free_wbio_buffer(s);
 446
 447                         s->new_session=0;
 448                         s->init_num=0;
 449
 450                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 451
 452                         s->ctx->stats.sess_accept_good++;
 453                         /* s->server=1; */
 454                         s->handshake_func=ssl3_accept;
 455                         ret=1;
 456
 457                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 458
 459                         goto end;
 460                         /* break; */
 461
 462                 default:
 463                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 464                         ret= -1;
 465                         goto end;
 466                         /* break; */
 467                         }
 468
 469                 if (!s->s3->tmp.reuse_message && !skip)
 470                         {
 471                         if (s->debug)
 472                                 {
 473                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 474                                         goto end;
 475                                 }
 476
 477
 478                         if ((cb != NULL) && (s->state != state))
 479                                 {
 480                                 new_state=s->state;
 481                                 s->state=state;
 482                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 483                                 s->state=new_state;
 484                                 }
 485                         }
 486                 skip=0;
 487                 }
 488 end:
 489         /* BIO_flush(s->wbio); */
 490
 491         if (cb != NULL)
 492                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 493         s->in_handshake--;
 494         return(ret);
 495         }
 496
 497 static int ssl3_send_hello_request(SSL *s)
 498         {
 499         unsigned char *p;
 500
 501         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 502                 {
 503                 p=(unsigned char *)s->init_buf->data;
 504                 *(p++)=SSL3_MT_CLIENT_REQUEST;
 505                 *(p++)=0;
 506                 *(p++)=0;
 507                 *(p++)=0;
 508
 509                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 510                 /* number of bytes to write */
 511                 s->init_num=4;
 512                 s->init_off=0;
 513                 }
 514
 515         /* SSL3_ST_SW_HELLO_REQ_B */
 516         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 517         }
 518
 519 static int ssl3_get_client_hello(SSL *s)
 520         {
 521         int i,j,ok,al,ret= -1;
 522         long n;
 523         unsigned long id;
 524         unsigned char *p,*d,*q;
 525         SSL_CIPHER *c;
 526         SSL_COMP *comp=NULL;
 527         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 528
 529         /* We do this so that we will respond with our native type.
 530          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 531          * This down switching should be handled by a different method.
 532          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 533          * TLSv1.
 534          */
 535         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 536                 {
 537                 s->first_packet=1;
 538                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 539                 }
 540         n=ssl3_get_message(s,
 541                 SSL3_ST_SR_CLNT_HELLO_B,
 542                 SSL3_ST_SR_CLNT_HELLO_C,
 543                 SSL3_MT_CLIENT_HELLO,
 544                 SSL3_RT_MAX_PLAIN_LENGTH,
 545                 &ok);
 546
 547         if (!ok) return((int)n);
 548         d=p=(unsigned char *)s->init_buf->data;
 549
 550         /* The version number has already been checked in ssl3_get_message.
 551          * I a native TLSv1/SSLv3 method, the match must be correct except
 552          * perhaps for the first message */
 553 /*      s->client_version=(((int)p[0])<<8)|(int)p[1]; */
 554         p+=2;
 555
 556         /* load the client random */
 557         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 558         p+=SSL3_RANDOM_SIZE;
 559
 560         /* get the session-id */
 561         j= *(p++);
 562
 563         s->hit=0;
 564         if (j == 0)
 565                 {
 566                 if (!ssl_get_new_session(s,1))
 567                         goto err;
 568                 }
 569         else
 570                 {
 571                 i=ssl_get_prev_session(s,p,j);
 572                 if (i == 1)
 573                         { /* previous session */
 574                         s->hit=1;
 575                         }
 576                 else
 577                         {
 578                         if (!ssl_get_new_session(s,1))
 579                                 goto err;
 580                         }
 581                 }
 582
 583         p+=j;
 584         n2s(p,i);
 585         if ((i == 0) && (j != 0))
 586                 {
 587                 /* we need a cipher if we are not resuming a session */
 588                 al=SSL_AD_ILLEGAL_PARAMETER;
 589                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 590                 goto f_err;
 591                 }
 592         if ((i+p) > (d+n))
 593                 {
 594                 /* not enough data */
 595                 al=SSL_AD_DECODE_ERROR;
 596                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 597                 goto f_err;
 598                 }
 599         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 600                 == NULL))
 601                 {
 602                 goto err;
 603                 }
 604         p+=i;
 605
 606         /* If it is a hit, check that the cipher is in the list */
 607         if ((s->hit) && (i > 0))
 608                 {
 609                 j=0;
 610                 id=s->session->cipher->id;
 611
 612 #ifdef CIPHER_DEBUG
 613                 printf("client sent %d ciphers\n",sk_num(ciphers));
 614 #endif
 615                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 616                         {
 617                         c=sk_SSL_CIPHER_value(ciphers,i);
 618 #ifdef CIPHER_DEBUG
 619                         printf("client [%2d of %2d]:%s\n",
 620                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 621 #endif
 622                         if (c->id == id)
 623                                 {
 624                                 j=1;
 625                                 break;
 626                                 }
 627                         }
 628                 if (j == 0)
 629                         {
 630                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 631                                 {
 632                                 /* Very bad for multi-threading.... */
 633                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 634                                                                        0);
 635                                 }
 636                         else
 637                                 {
 638                                 /* we need to have the cipher in the cipher
 639                                  * list if we are asked to reuse it */
 640                                 al=SSL_AD_ILLEGAL_PARAMETER;
 641                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 642                                 goto f_err;
 643                                 }
 644                         }
 645                 }
 646
 647         /* compression */
 648         i= *(p++);
 649         q=p;
 650         for (j=0; j<i; j++)
 651                 {
 652                 if (p[j] == 0) break;
 653                 }
 654
 655         p+=i;
 656         if (j >= i)
 657                 {
 658                 /* no compress */
 659                 al=SSL_AD_DECODE_ERROR;
 660                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 661                 goto f_err;
 662                 }
 663
 664         /* Worst case, we will use the NULL compression, but if we have other
 665          * options, we will now look for them.  We have i-1 compression
 666          * algorithms from the client, starting at q. */
 667         s->s3->tmp.new_compression=NULL;
 668         if (s->ctx->comp_methods != NULL)
 669                 { /* See if we have a match */
 670                 int m,nn,o,v,done=0;
 671
 672                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 673                 for (m=0; m<nn; m++)
 674                         {
 675                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 676                         v=comp->id;
 677                         for (o=0; o<i; o++)
 678                                 {
 679                                 if (v == q[o])
 680                                         {
 681                                         done=1;
 682                                         break;
 683                                         }
 684                                 }
 685                         if (done) break;
 686                         }
 687                 if (done)
 688                         s->s3->tmp.new_compression=comp;
 689                 else
 690                         comp=NULL;
 691                 }
 692
 693         /* TLS does not mind if there is extra stuff */
 694         if (s->version == SSL3_VERSION)
 695                 {
 696                 if (p > (d+n))
 697                         {
 698                         /* wrong number of bytes,
 699                          * there could be more to follow */
 700                         al=SSL_AD_DECODE_ERROR;
 701                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 702                         goto f_err;
 703                         }
 704                 }
 705
 706         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 707          * pick a cipher */
 708
 709         if (!s->hit)
 710                 {
 711                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 712                 if (s->session->ciphers != NULL)
 713                         sk_SSL_CIPHER_free(s->session->ciphers);
 714                 s->session->ciphers=ciphers;
 715                 if (ciphers == NULL)
 716                         {
 717                         al=SSL_AD_ILLEGAL_PARAMETER;
 718                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 719                         goto f_err;
 720                         }
 721                 ciphers=NULL;
 722                 c=ssl3_choose_cipher(s,s->session->ciphers,
 723                                      ssl_get_ciphers_by_id(s));
 724
 725                 if (c == NULL)
 726                         {
 727                         al=SSL_AD_HANDSHAKE_FAILURE;
 728                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 729                         goto f_err;
 730                         }
 731                 s->s3->tmp.new_cipher=c;
 732                 }
 733         else
 734                 {
 735                 /* Session-id reuse */
 736 #ifdef REUSE_CIPHER_BUG
 737                 STACK_OF(SSL_CIPHER) *sk;
 738                 SSL_CIPHER *nc=NULL;
 739                 SSL_CIPHER *ec=NULL;
 740
 741                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 742                         {
 743                         sk=s->session->ciphers;
 744                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 745                                 {
 746                                 c=sk_SSL_CIPHER_value(sk,i);
 747                                 if (c->algorithms & SSL_eNULL)
 748                                         nc=c;
 749                                 if (SSL_C_IS_EXPORT(c))
 750                                         ec=c;
 751                                 }
 752                         if (nc != NULL)
 753                                 s->s3->tmp.new_cipher=nc;
 754                         else if (ec != NULL)
 755                                 s->s3->tmp.new_cipher=ec;
 756                         else
 757                                 s->s3->tmp.new_cipher=s->session->cipher;
 758                         }
 759                 else
 760 #endif
 761                 s->s3->tmp.new_cipher=s->session->cipher;
 762                 }
 763
 764         /* we now have the following setup.
 765          * client_random
 766          * cipher_list          - our prefered list of ciphers
 767          * ciphers              - the clients prefered list of ciphers
 768          * compression          - basically ignored right now
 769          * ssl version is set   - sslv3
 770          * s->session           - The ssl session has been setup.
 771          * s->hit               - sesson reuse flag
 772          * s->tmp.new_cipher    - the new cipher to use.
 773          */
 774
 775         ret=1;
 776         if (0)
 777                 {
 778 f_err:
 779                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 780                 }
 781 err:
 782         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 783         return(ret);
 784         }
 785
 786 static int ssl3_send_server_hello(SSL *s)
 787         {
 788         unsigned char *buf;
 789         unsigned char *p,*d;
 790         int i,sl;
 791         unsigned long l,Time;
 792
 793         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 794                 {
 795                 buf=(unsigned char *)s->init_buf->data;
 796                 p=s->s3->server_random;
 797                 Time=time(NULL);                        /* Time */
 798                 l2n(Time,p);
 799                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 800                 /* Do the message type and length last */
 801                 d=p= &(buf[4]);
 802
 803                 *(p++)=s->version>>8;
 804                 *(p++)=s->version&0xff;
 805
 806                 /* Random stuff */
 807                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 808                 p+=SSL3_RANDOM_SIZE;
 809
 810                 /* now in theory we have 3 options to sending back the
 811                  * session id.  If it is a re-use, we send back the
 812                  * old session-id, if it is a new session, we send
 813                  * back the new session-id or we send back a 0 length
 814                  * session-id if we want it to be single use.
 815                  * Currently I will not implement the '0' length session-id
 816                  * 12-Jan-98 - I'll now support the '0' length stuff.
 817                  */
 818                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 819                         s->session->session_id_length=0;
 820
 821                 sl=s->session->session_id_length;
 822                 *(p++)=sl;
 823                 memcpy(p,s->session->session_id,sl);
 824                 p+=sl;
 825
 826                 /* put the cipher */
 827                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 828                 p+=i;
 829
 830                 /* put the compression method */
 831                 if (s->s3->tmp.new_compression == NULL)
 832                         *(p++)=0;
 833                 else
 834                         *(p++)=s->s3->tmp.new_compression->id;
 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(SSL *s)
 853         {
 854         unsigned char *p;
 855
 856         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 857                 {
 858                 p=(unsigned char *)s->init_buf->data;
 859
 860                 /* do the header */
 861                 *(p++)=SSL3_MT_SERVER_DONE;
 862                 *(p++)=0;
 863                 *(p++)=0;
 864                 *(p++)=0;
 865
 866                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 867                 /* number of bytes to write */
 868                 s->init_num=4;
 869                 s->init_off=0;
 870                 }
 871
 872         /* SSL3_ST_CW_CLNT_HELLO_B */
 873         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 874         }
 875
 876 static int ssl3_send_server_key_exchange(SSL *s)
 877         {
 878 #ifndef NO_RSA
 879         unsigned char *q;
 880         int j,num;
 881         RSA *rsa;
 882         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 883 #endif
 884 #ifndef NO_DH
 885         DH *dh,*dhp;
 886 #endif
 887         EVP_PKEY *pkey;
 888         unsigned char *p,*d;
 889         int al,i;
 890         unsigned long type;
 891         int n;
 892         CERT *cert;
 893         BIGNUM *r[4];
 894         int nr[4],kn;
 895         BUF_MEM *buf;
 896         EVP_MD_CTX md_ctx;
 897
 898         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 899                 {
 900                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 901                 cert=s->session->sess_cert;
 902
 903                 buf=s->init_buf;
 904
 905                 r[0]=r[1]=r[2]=r[3]=NULL;
 906                 n=0;
 907 #ifndef NO_RSA
 908                 if (type & SSL_kRSA)
 909                         {
 910                         rsa=cert->rsa_tmp;
 911                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 912                                 {
 913                                 rsa=s->cert->rsa_tmp_cb(s,
 914                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 915                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 916                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 917                                 cert->rsa_tmp=rsa;
 918                                 }
 919                         if (rsa == NULL)
 920                                 {
 921                                 al=SSL_AD_HANDSHAKE_FAILURE;
 922                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 923                                 goto f_err;
 924                                 }
 925                         r[0]=rsa->n;
 926                         r[1]=rsa->e;
 927                         s->s3->tmp.use_rsa_tmp=1;
 928                         }
 929                 else
 930 #endif
 931 #ifndef NO_DH
 932                         if (type & SSL_kEDH)
 933                         {
 934                         dhp=cert->dh_tmp;
 935                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 936                                 dhp=s->cert->dh_tmp_cb(s,
 937                                       !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 938                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 939                         if (dhp == NULL)
 940                                 {
 941                                 al=SSL_AD_HANDSHAKE_FAILURE;
 942                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 943                                 goto f_err;
 944                                 }
 945                         if ((dh=DHparams_dup(dhp)) == NULL)
 946                                 {
 947                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 948                                 goto err;
 949                                 }
 950
 951                         s->s3->tmp.dh=dh;
 952                         if ((dhp->pub_key == NULL ||
 953                              dhp->priv_key == NULL ||
 954                              (s->options & SSL_OP_SINGLE_DH_USE)))
 955                                 {
 956                                 if(!DH_generate_key(dh))
 957                                     {
 958                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
 959                                            ERR_R_DH_LIB);
 960                                     goto err;
 961                                     }
 962                                 }
 963                         else
 964                                 {
 965                                 dh->pub_key=BN_dup(dhp->pub_key);
 966                                 dh->priv_key=BN_dup(dhp->priv_key);
 967                                 if ((dh->pub_key == NULL) ||
 968                                         (dh->priv_key == NULL))
 969                                         {
 970                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 971                                         goto err;
 972                                         }
 973                                 }
 974                         r[0]=dh->p;
 975                         r[1]=dh->g;
 976                         r[2]=dh->pub_key;
 977                         }
 978                 else
 979 #endif
 980                         {
 981                         al=SSL_AD_HANDSHAKE_FAILURE;
 982                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 983                         goto f_err;
 984                         }
 985                 for (i=0; r[i] != NULL; i++)
 986                         {
 987                         nr[i]=BN_num_bytes(r[i]);
 988                         n+=2+nr[i];
 989                         }
 990
 991                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 992                         {
 993                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 994                                 == NULL)
 995                                 {
 996                                 al=SSL_AD_DECODE_ERROR;
 997                                 goto f_err;
 998                                 }
 999                         kn=EVP_PKEY_size(pkey);
1000                         }
1001                 else
1002                         {
1003                         pkey=NULL;
1004                         kn=0;
1005                         }
1006
1007                 if (!BUF_MEM_grow(buf,n+4+kn))
1008                         {
1009                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1010                         goto err;
1011                         }
1012                 d=(unsigned char *)s->init_buf->data;
1013                 p= &(d[4]);
1014
1015                 for (i=0; r[i] != NULL; i++)
1016                         {
1017                         s2n(nr[i],p);
1018                         BN_bn2bin(r[i],p);
1019                         p+=nr[i];
1020                         }
1021
1022                 /* not anonymous */
1023                 if (pkey != NULL)
1024                         {
1025                         /* n is the length of the params, they start at &(d[4])
1026                          * and p points to the space at the end. */
1027 #ifndef NO_RSA
1028                         if (pkey->type == EVP_PKEY_RSA)
1029                                 {
1030                                 q=md_buf;
1031                                 j=0;
1032                                 for (num=2; num > 0; num--)
1033                                         {
1034                                         EVP_DigestInit(&md_ctx,(num == 2)
1035                                                 ?s->ctx->md5:s->ctx->sha1);
1036                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1037                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1038                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1039                                         EVP_DigestFinal(&md_ctx,q,
1040                                                 (unsigned int *)&i);
1041                                         q+=i;
1042                                         j+=i;
1043                                         }
1044                                 i=RSA_private_encrypt(j,md_buf,&(p[2]),
1045                                         pkey->pkey.rsa,RSA_PKCS1_PADDING);
1046                                 if (i <= 0)
1047                                         {
1048                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1049                                         goto err;
1050                                         }
1051                                 s2n(i,p);
1052                                 n+=i+2;
1053                                 }
1054                         else
1055 #endif
1056 #if !defined(NO_DSA)
1057                                 if (pkey->type == EVP_PKEY_DSA)
1058                                 {
1059                                 /* lets do DSS */
1060                                 EVP_SignInit(&md_ctx,EVP_dss1());
1061                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1062                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1063                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1064                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1065                                         (unsigned int *)&i,pkey))
1066                                         {
1067                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1068                                         goto err;
1069                                         }
1070                                 s2n(i,p);
1071                                 n+=i+2;
1072                                 }
1073                         else
1074 #endif
1075                                 {
1076                                 /* Is this error check actually needed? */
1077                                 al=SSL_AD_HANDSHAKE_FAILURE;
1078                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1079                                 goto f_err;
1080                                 }
1081                         }
1082
1083                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1084                 l2n3(n,d);
1085
1086                 /* we should now have things packed up, so lets send
1087                  * it off */
1088                 s->init_num=n+4;
1089                 s->init_off=0;
1090                 }
1091
1092         /* SSL3_ST_SW_KEY_EXCH_B */
1093         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1094 f_err:
1095         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1096 err:
1097         return(-1);
1098         }
1099
1100 static int ssl3_send_certificate_request(SSL *s)
1101         {
1102         unsigned char *p,*d;
1103         int i,j,nl,off,n;
1104         STACK_OF(X509_NAME) *sk=NULL;
1105         X509_NAME *name;
1106         BUF_MEM *buf;
1107
1108         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1109                 {
1110                 buf=s->init_buf;
1111
1112                 d=p=(unsigned char *)&(buf->data[4]);
1113
1114                 /* get the list of acceptable cert types */
1115                 p++;
1116                 n=ssl3_get_req_cert_type(s,p);
1117                 d[0]=n;
1118                 p+=n;
1119                 n++;
1120
1121                 off=n;
1122                 p+=2;
1123                 n+=2;
1124
1125                 sk=SSL_get_client_CA_list(s);
1126                 nl=0;
1127                 if (sk != NULL)
1128                         {
1129                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1130                                 {
1131                                 name=sk_X509_NAME_value(sk,i);
1132                                 j=i2d_X509_NAME(name,NULL);
1133                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1134                                         {
1135                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1136                                         goto err;
1137                                         }
1138                                 p=(unsigned char *)&(buf->data[4+n]);
1139                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1140                                         {
1141                                         s2n(j,p);
1142                                         i2d_X509_NAME(name,&p);
1143                                         n+=2+j;
1144                                         nl+=2+j;
1145                                         }
1146                                 else
1147                                         {
1148                                         d=p;
1149                                         i2d_X509_NAME(name,&p);
1150                                         j-=2; s2n(j,d); j+=2;
1151                                         n+=j;
1152                                         nl+=j;
1153                                         }
1154                                 }
1155                         }
1156                 /* else no CA names */
1157                 p=(unsigned char *)&(buf->data[4+off]);
1158                 s2n(nl,p);
1159
1160                 d=(unsigned char *)buf->data;
1161                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1162                 l2n3(n,d);
1163
1164                 /* we should now have things packed up, so lets send
1165                  * it off */
1166
1167                 s->init_num=n+4;
1168                 s->init_off=0;
1169                 }
1170
1171         /* SSL3_ST_SW_CERT_REQ_B */
1172         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1173 err:
1174         return(-1);
1175         }
1176
1177 static int ssl3_get_client_key_exchange(SSL *s)
1178         {
1179         int i,al,ok;
1180         long n;
1181         unsigned long l;
1182         unsigned char *p;
1183 #ifndef NO_RSA
1184         RSA *rsa=NULL;
1185         EVP_PKEY *pkey=NULL;
1186 #endif
1187 #ifndef NO_DH
1188         BIGNUM *pub=NULL;
1189         DH *dh_srvr;
1190 #endif
1191
1192         n=ssl3_get_message(s,
1193                 SSL3_ST_SR_KEY_EXCH_A,
1194                 SSL3_ST_SR_KEY_EXCH_B,
1195                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1196                 400, /* ???? */
1197                 &ok);
1198
1199         if (!ok) return((int)n);
1200         p=(unsigned char *)s->init_buf->data;
1201
1202         l=s->s3->tmp.new_cipher->algorithms;
1203
1204 #ifndef NO_RSA
1205         if (l & SSL_kRSA)
1206                 {
1207                 /* FIX THIS UP EAY EAY EAY EAY */
1208                 if (s->s3->tmp.use_rsa_tmp)
1209                         {
1210                         if ((s->session->sess_cert != NULL) &&
1211                                 (s->session->sess_cert->rsa_tmp != NULL))
1212                                 rsa=s->session->sess_cert->rsa_tmp;
1213                         else if ((s->cert != NULL) &&
1214                                 (s->cert->rsa_tmp != NULL))
1215                                 rsa=s->cert->rsa_tmp;
1216                         /* Don't do a callback because rsa_tmp should
1217                          * be sent already */
1218                         if (rsa == NULL)
1219                                 {
1220                                 al=SSL_AD_HANDSHAKE_FAILURE;
1221                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1222                                 goto f_err;
1223
1224                                 }
1225                         }
1226                 else
1227                         {
1228                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1229                         if (    (pkey == NULL) ||
1230                                 (pkey->type != EVP_PKEY_RSA) ||
1231                                 (pkey->pkey.rsa == NULL))
1232                                 {
1233                                 al=SSL_AD_HANDSHAKE_FAILURE;
1234                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1235                                 goto f_err;
1236                                 }
1237                         rsa=pkey->pkey.rsa;
1238                         }
1239
1240                 /* TLS */
1241                 if (s->version > SSL3_VERSION)
1242                         {
1243                         n2s(p,i);
1244                         if (n != i+2)
1245                                 {
1246                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1247                                         {
1248                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1249                                         goto err;
1250                                         }
1251                                 else
1252                                         p-=2;
1253                                 }
1254                         else
1255                                 n=i;
1256                         }
1257
1258                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1259
1260 #if 1
1261                 /* If a bad decrypt, use a random master key */
1262                 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1263                         ((p[0] != (s->client_version>>8)) ||
1264                          (p[1] != (s->client_version & 0xff))))
1265                         {
1266                         int bad=1;
1267
1268                         if ((i == SSL_MAX_MASTER_KEY_LENGTH) &&
1269                                 (p[0] == (s->version>>8)) &&
1270                                 (p[1] == 0))
1271                                 {
1272                                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
1273                                         bad=0;
1274                                 }
1275                         if (bad)
1276                                 {
1277                                 p[0]=(s->version>>8);
1278                                 p[1]=(s->version & 0xff);
1279                                 RAND_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1280                                 i=SSL_MAX_MASTER_KEY_LENGTH;
1281                                 }
1282                         /* else, an SSLeay bug, ssl only server, tls client */
1283                         }
1284 #else
1285                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1286                         {
1287                         al=SSL_AD_DECODE_ERROR;
1288                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1289                         goto f_err;
1290                         }
1291
1292                 if ((p[0] != (s->version>>8)) || (p[1] != (s->version & 0xff)))
1293                         {
1294                         al=SSL_AD_DECODE_ERROR;
1295                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1296                         goto f_err;
1297                         }
1298 #endif
1299
1300                 s->session->master_key_length=
1301                         s->method->ssl3_enc->generate_master_secret(s,
1302                                 s->session->master_key,
1303                                 p,i);
1304                 memset(p,0,i);
1305                 }
1306         else
1307 #endif
1308 #ifndef NO_DH
1309                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1310                 {
1311                 n2s(p,i);
1312                 if (n != i+2)
1313                         {
1314                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1315                                 {
1316                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1317                                 goto err;
1318                                 }
1319                         else
1320                                 {
1321                                 p-=2;
1322                                 i=(int)n;
1323                                 }
1324                         }
1325
1326                 if (n == 0L) /* the parameters are in the cert */
1327                         {
1328                         al=SSL_AD_HANDSHAKE_FAILURE;
1329                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1330                         goto f_err;
1331                         }
1332                 else
1333                         {
1334                         if (s->s3->tmp.dh == NULL)
1335                                 {
1336                                 al=SSL_AD_HANDSHAKE_FAILURE;
1337                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1338                                 goto f_err;
1339                                 }
1340                         else
1341                                 dh_srvr=s->s3->tmp.dh;
1342                         }
1343
1344                 pub=BN_bin2bn(p,i,NULL);
1345                 if (pub == NULL)
1346                         {
1347                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1348                         goto err;
1349                         }
1350
1351                 i=DH_compute_key(p,pub,dh_srvr);
1352
1353                 if (i <= 0)
1354                         {
1355                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1356                         goto err;
1357                         }
1358
1359                 DH_free(s->s3->tmp.dh);
1360                 s->s3->tmp.dh=NULL;
1361
1362                 BN_clear_free(pub);
1363                 pub=NULL;
1364                 s->session->master_key_length=
1365                         s->method->ssl3_enc->generate_master_secret(s,
1366                                 s->session->master_key,p,i);
1367                 }
1368         else
1369 #endif
1370                 {
1371                 al=SSL_AD_HANDSHAKE_FAILURE;
1372                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1373                 goto f_err;
1374                 }
1375
1376         return(1);
1377 f_err:
1378         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1379 #if !defined(NO_DH) || !defined(NO_RSA)
1380 err:
1381 #endif
1382         return(-1);
1383         }
1384
1385 static int ssl3_get_cert_verify(SSL *s)
1386         {
1387         EVP_PKEY *pkey=NULL;
1388         unsigned char *p;
1389         int al,ok,ret=0;
1390         long n;
1391         int type=0,i,j;
1392         X509 *peer;
1393
1394         n=ssl3_get_message(s,
1395                 SSL3_ST_SR_CERT_VRFY_A,
1396                 SSL3_ST_SR_CERT_VRFY_B,
1397                 -1,
1398                 512, /* 512? */
1399                 &ok);
1400
1401         if (!ok) return((int)n);
1402
1403         if (s->session->peer != NULL)
1404                 {
1405                 peer=s->session->peer;
1406                 pkey=X509_get_pubkey(peer);
1407                 type=X509_certificate_type(peer,pkey);
1408                 }
1409         else
1410                 {
1411                 peer=NULL;
1412                 pkey=NULL;
1413                 }
1414
1415         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1416                 {
1417                 s->s3->tmp.reuse_message=1;
1418                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1419                         {
1420                         al=SSL_AD_UNEXPECTED_MESSAGE;
1421                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1422                         goto f_err;
1423                         }
1424                 ret=1;
1425                 goto end;
1426                 }
1427
1428         if (peer == NULL)
1429                 {
1430                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1431                 al=SSL_AD_UNEXPECTED_MESSAGE;
1432                 goto f_err;
1433                 }
1434
1435         if (!(type & EVP_PKT_SIGN))
1436                 {
1437                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1438                 al=SSL_AD_ILLEGAL_PARAMETER;
1439                 goto f_err;
1440                 }
1441
1442         if (s->s3->change_cipher_spec)
1443                 {
1444                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1445                 al=SSL_AD_UNEXPECTED_MESSAGE;
1446                 goto f_err;
1447                 }
1448
1449         /* we now have a signature that we need to verify */
1450         p=(unsigned char *)s->init_buf->data;
1451         n2s(p,i);
1452         n-=2;
1453         if (i > n)
1454                 {
1455                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1456                 al=SSL_AD_DECODE_ERROR;
1457                 goto f_err;
1458                 }
1459
1460         j=EVP_PKEY_size(pkey);
1461         if ((i > j) || (n > j) || (n <= 0))
1462                 {
1463                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1464                 al=SSL_AD_DECODE_ERROR;
1465                 goto f_err;
1466                 }
1467
1468 #ifndef NO_RSA
1469         if (pkey->type == EVP_PKEY_RSA)
1470                 {
1471                 i=RSA_public_decrypt(i,p,p,pkey->pkey.rsa,RSA_PKCS1_PADDING);
1472                 if (i < 0)
1473                         {
1474                         al=SSL_AD_DECRYPT_ERROR;
1475                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1476                         goto f_err;
1477                         }
1478                 if ((i != (MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH)) ||
1479                         memcmp(&(s->s3->tmp.finish_md[0]),p,
1480                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH))
1481                         {
1482                         al=SSL_AD_DECRYPT_ERROR;
1483                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1484                         goto f_err;
1485                         }
1486                 }
1487         else
1488 #endif
1489 #ifndef NO_DSA
1490                 if (pkey->type == EVP_PKEY_DSA)
1491                 {
1492                 j=DSA_verify(pkey->save_type,
1493                         &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]),
1494                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1495                 if (j <= 0)
1496                         {
1497                         /* bad signature */
1498                         al=SSL_AD_DECRYPT_ERROR;
1499                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1500                         goto f_err;
1501                         }
1502                 }
1503         else
1504 #endif
1505                 {
1506                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1507                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1508                 goto f_err;
1509                 }
1510
1511
1512         ret=1;
1513         if (0)
1514                 {
1515 f_err:
1516                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1517                 }
1518 end:
1519         EVP_PKEY_free(pkey);
1520         return(ret);
1521         }
1522
1523 static int ssl3_get_client_certificate(SSL *s)
1524         {
1525         int i,ok,al,ret= -1;
1526         X509 *x=NULL;
1527         unsigned long l,nc,llen,n;
1528         unsigned char *p,*d,*q;
1529         STACK_OF(X509) *sk=NULL;
1530
1531         n=ssl3_get_message(s,
1532                 SSL3_ST_SR_CERT_A,
1533                 SSL3_ST_SR_CERT_B,
1534                 -1,
1535 #if defined(MSDOS) && !defined(WIN32)
1536                 1024*30, /* 30k max cert list :-) */
1537 #else
1538                 1024*100, /* 100k max cert list :-) */
1539 #endif
1540                 &ok);
1541
1542         if (!ok) return((int)n);
1543
1544         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1545                 {
1546                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1547                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1548                         {
1549                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1550                         al=SSL_AD_HANDSHAKE_FAILURE;
1551                         goto f_err;
1552                         }
1553                 /* If tls asked for a client cert we must return a 0 list */
1554                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1555                         {
1556                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1557                         al=SSL_AD_UNEXPECTED_MESSAGE;
1558                         goto f_err;
1559                         }
1560                 s->s3->tmp.reuse_message=1;
1561                 return(1);
1562                 }
1563
1564         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1565                 {
1566                 al=SSL_AD_UNEXPECTED_MESSAGE;
1567                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1568                 goto f_err;
1569                 }
1570         d=p=(unsigned char *)s->init_buf->data;
1571
1572         if ((sk=sk_X509_new_null()) == NULL)
1573                 {
1574                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1575                 goto err;
1576                 }
1577
1578         n2l3(p,llen);
1579         if (llen+3 != n)
1580                 {
1581                 al=SSL_AD_DECODE_ERROR;
1582                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1583                 goto f_err;
1584                 }
1585         for (nc=0; nc<llen; )
1586                 {
1587                 n2l3(p,l);
1588                 if ((l+nc+3) > llen)
1589                         {
1590                         al=SSL_AD_DECODE_ERROR;
1591                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1592                         goto f_err;
1593                         }
1594
1595                 q=p;
1596                 x=d2i_X509(NULL,&p,l);
1597                 if (x == NULL)
1598                         {
1599                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1600                         goto err;
1601                         }
1602                 if (p != (q+l))
1603                         {
1604                         al=SSL_AD_DECODE_ERROR;
1605                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1606                         goto f_err;
1607                         }
1608                 if (!sk_X509_push(sk,x))
1609                         {
1610                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1611                         goto err;
1612                         }
1613                 x=NULL;
1614                 nc+=l+3;
1615                 }
1616
1617         if (sk_X509_num(sk) <= 0)
1618                 {
1619                 /* TLS does not mind 0 certs returned */
1620                 if (s->version == SSL3_VERSION)
1621                         {
1622                         al=SSL_AD_HANDSHAKE_FAILURE;
1623                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1624                         goto f_err;
1625                         }
1626                 /* Fail for TLS only if we required a certificate */
1627                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1628                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1629                         {
1630                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1631                         al=SSL_AD_HANDSHAKE_FAILURE;
1632                         goto f_err;
1633                         }
1634                 }
1635         else
1636                 {
1637                 i=ssl_verify_cert_chain(s,sk);
1638                 if (!i)
1639                         {
1640                         al=ssl_verify_alarm_type(s->verify_result);
1641                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1642                         goto f_err;
1643                         }
1644                 }
1645
1646         /* This should not be needed */
1647         if (s->session->peer != NULL)
1648                 X509_free(s->session->peer);
1649         s->session->peer=sk_X509_shift(sk);
1650
1651         s->session->sess_cert->cert_chain=sk;
1652
1653         sk=NULL;
1654
1655         ret=1;
1656         if (0)
1657                 {
1658 f_err:
1659                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1660                 }
1661 err:
1662         if (x != NULL) X509_free(x);
1663         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1664         return(ret);
1665         }
1666
1667 int ssl3_send_server_certificate(SSL *s)
1668         {
1669         unsigned long l;
1670         X509 *x;
1671
1672         if (s->state == SSL3_ST_SW_CERT_A)
1673                 {
1674                 x=ssl_get_server_send_cert(s);
1675                 if (x == NULL)
1676                         {
1677                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1678                         return(0);
1679                         }
1680
1681                 l=ssl3_output_cert_chain(s,x);
1682                 s->state=SSL3_ST_SW_CERT_B;
1683                 s->init_num=(int)l;
1684                 s->init_off=0;
1685                 }
1686
1687         /* SSL3_ST_SW_CERT_B */
1688         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1689         }