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 #define NETSCAPE_HANG_BUG
  61
  62
  63 #include <stdio.h>
  64 #include <openssl/buffer.h>
  65 #include <openssl/rand.h>
  66 #include <openssl/objects.h>
  67 #include <openssl/md5.h>
  68 #include <openssl/sha.h>
  69 #include <openssl/evp.h>
  70 #include <openssl/x509.h>
  71 #include "ssl_locl.h"
  72
  73 #ifndef NO_KRB5
  74 #include "kssl.h"
  75 #endif /* NO_KRB5 */
  76
  77 static SSL_METHOD *ssl3_get_server_method(int ver);
  78 static int ssl3_get_client_hello(SSL *s);
  79 static int ssl3_check_client_hello(SSL *s);
  80 static int ssl3_send_server_hello(SSL *s);
  81 static int ssl3_send_server_key_exchange(SSL *s);
  82 static int ssl3_send_certificate_request(SSL *s);
  83 static int ssl3_send_server_done(SSL *s);
  84 static int ssl3_get_client_key_exchange(SSL *s);
  85 static int ssl3_get_client_certificate(SSL *s);
  86 static int ssl3_get_cert_verify(SSL *s);
  87 static int ssl3_send_hello_request(SSL *s);
  88
  89 static SSL_METHOD *ssl3_get_server_method(int ver)
  90         {
  91         if (ver == SSL3_VERSION)
  92                 return(SSLv3_server_method());
  93         else
  94                 return(NULL);
  95         }
  96
  97 SSL_METHOD *SSLv3_server_method(void)
  98         {
  99         static int init=1;
 100         static SSL_METHOD SSLv3_server_data;
 101
 102         if (init)
 103                 {
 104                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 105                         sizeof(SSL_METHOD));
 106                 SSLv3_server_data.ssl_accept=ssl3_accept;
 107                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 108                 init=0;
 109                 }
 110         return(&SSLv3_server_data);
 111         }
 112
 113 int ssl3_accept(SSL *s)
 114         {
 115         BUF_MEM *buf;
 116         unsigned long l,Time=time(NULL);
 117         void (*cb)()=NULL;
 118         long num1;
 119         int ret= -1;
 120         int new_state,state,skip=0;
 121
 122         RAND_add(&Time,sizeof(Time),0);
 123         ERR_clear_error();
 124         clear_sys_error();
 125
 126         if (s->info_callback != NULL)
 127                 cb=s->info_callback;
 128         else if (s->ctx->info_callback != NULL)
 129                 cb=s->ctx->info_callback;
 130
 131         /* init things to blank */
 132         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 133         s->in_handshake++;
 134
 135         if (s->cert == NULL)
 136                 {
 137                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 138                 return(-1);
 139                 }
 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                                 {
 161                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_INTERNAL_ERROR);
 162                                 return -1;
 163                                 }
 164                         s->type=SSL_ST_ACCEPT;
 165
 166                         if (s->init_buf == NULL)
 167                                 {
 168                                 if ((buf=BUF_MEM_new()) == NULL)
 169                                         {
 170                                         ret= -1;
 171                                         goto end;
 172                                         }
 173                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 174                                         {
 175                                         ret= -1;
 176                                         goto end;
 177                                         }
 178                                 s->init_buf=buf;
 179                                 }
 180
 181                         if (!ssl3_setup_buffers(s))
 182                                 {
 183                                 ret= -1;
 184                                 goto end;
 185                                 }
 186
 187                         /* Ok, we now need to push on a buffering BIO so that
 188                          * the output is sent in a way that TCP likes :-)
 189                          */
 190                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 191
 192                         s->init_num=0;
 193
 194                         if (s->state != SSL_ST_RENEGOTIATE)
 195                                 {
 196                                 ssl3_init_finished_mac(s);
 197                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 198                                 s->ctx->stats.sess_accept++;
 199                                 }
 200                         else
 201                                 {
 202                                 s->ctx->stats.sess_accept_renegotiate++;
 203                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 204                                 }
 205                         break;
 206
 207                 case SSL3_ST_SW_HELLO_REQ_A:
 208                 case SSL3_ST_SW_HELLO_REQ_B:
 209
 210                         s->shutdown=0;
 211                         ret=ssl3_send_hello_request(s);
 212                         if (ret <= 0) goto end;
 213                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 214                         s->state=SSL3_ST_SW_FLUSH;
 215                         s->init_num=0;
 216
 217                         ssl3_init_finished_mac(s);
 218                         break;
 219
 220                 case SSL3_ST_SW_HELLO_REQ_C:
 221                         s->state=SSL_ST_OK;
 222                         ret=1;
 223                         goto end;
 224                         /* break; */
 225
 226                 case SSL3_ST_SR_CLNT_HELLO_A:
 227                 case SSL3_ST_SR_CLNT_HELLO_B:
 228                 case SSL3_ST_SR_CLNT_HELLO_C:
 229
 230                         s->shutdown=0;
 231                         ret=ssl3_get_client_hello(s);
 232                         if (ret <= 0) goto end;
 233                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 234                         s->init_num=0;
 235                         break;
 236
 237                 case SSL3_ST_SW_SRVR_HELLO_A:
 238                 case SSL3_ST_SW_SRVR_HELLO_B:
 239                         ret=ssl3_send_server_hello(s);
 240                         if (ret <= 0) goto end;
 241
 242                         if (s->hit)
 243                                 s->state=SSL3_ST_SW_CHANGE_A;
 244                         else
 245                                 s->state=SSL3_ST_SW_CERT_A;
 246                         s->init_num=0;
 247                         break;
 248
 249                 case SSL3_ST_SW_CERT_A:
 250                 case SSL3_ST_SW_CERT_B:
 251                         /* Check if it is anon DH */
 252                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 253                                 {
 254                                 ret=ssl3_send_server_certificate(s);
 255                                 if (ret <= 0) goto end;
 256                                 }
 257                         else
 258                                 skip=1;
 259                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 260                         s->init_num=0;
 261                         break;
 262
 263                 case SSL3_ST_SW_KEY_EXCH_A:
 264                 case SSL3_ST_SW_KEY_EXCH_B:
 265                         l=s->s3->tmp.new_cipher->algorithms;
 266
 267                         /* clear this, it may get reset by
 268                          * send_server_key_exchange */
 269                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 270 #ifndef NO_KRB5
 271                                 && !(l & SSL_KRB5)
 272 #endif /* NO_KRB5 */
 273                                 )
 274                                 s->s3->tmp.use_rsa_tmp=1;
 275                         else
 276                                 s->s3->tmp.use_rsa_tmp=0;
 277
 278                         /* only send if a DH key exchange, fortezza or
 279                          * RSA but we have a sign only certificate */
 280                         if (s->s3->tmp.use_rsa_tmp
 281                             || (l & (SSL_DH|SSL_kFZA))
 282                             || ((l & SSL_kRSA)
 283                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 284                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 285                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 286                                         )
 287                                     )
 288                                 )
 289                             )
 290                                 {
 291                                 ret=ssl3_send_server_key_exchange(s);
 292                                 if (ret <= 0) goto end;
 293                                 }
 294                         else
 295                                 skip=1;
 296
 297                         s->state=SSL3_ST_SW_CERT_REQ_A;
 298                         s->init_num=0;
 299                         break;
 300
 301                 case SSL3_ST_SW_CERT_REQ_A:
 302                 case SSL3_ST_SW_CERT_REQ_B:
 303                         if (/* don't request cert unless asked for it: */
 304                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 305                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 306                                  * don't request cert during re-negotiation: */
 307                                 ((s->session->peer != NULL) &&
 308                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 309                                 /* never request cert in anonymous ciphersuites
 310                                  * (see section "Certificate request" in SSL 3 drafts
 311                                  * and in RFC 2246): */
 312                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 313                                  /* ... except when the application insists on verification
 314                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 315                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
 316                                 {
 317                                 /* no cert request */
 318                                 skip=1;
 319                                 s->s3->tmp.cert_request=0;
 320                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 321                                 }
 322                         else
 323                                 {
 324                                 s->s3->tmp.cert_request=1;
 325                                 ret=ssl3_send_certificate_request(s);
 326                                 if (ret <= 0) goto end;
 327 #ifndef NETSCAPE_HANG_BUG
 328                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 329 #else
 330                                 s->state=SSL3_ST_SW_FLUSH;
 331                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 332 #endif
 333                                 s->init_num=0;
 334                                 }
 335                         break;
 336
 337                 case SSL3_ST_SW_SRVR_DONE_A:
 338                 case SSL3_ST_SW_SRVR_DONE_B:
 339                         ret=ssl3_send_server_done(s);
 340                         if (ret <= 0) goto end;
 341                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 342                         s->state=SSL3_ST_SW_FLUSH;
 343                         s->init_num=0;
 344                         break;
 345
 346                 case SSL3_ST_SW_FLUSH:
 347                         /* number of bytes to be flushed */
 348                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 349                         if (num1 > 0)
 350                                 {
 351                                 s->rwstate=SSL_WRITING;
 352                                 num1=BIO_flush(s->wbio);
 353                                 if (num1 <= 0) { ret= -1; goto end; }
 354                                 s->rwstate=SSL_NOTHING;
 355                                 }
 356
 357                         s->state=s->s3->tmp.next_state;
 358                         break;
 359
 360                 case SSL3_ST_SR_CERT_A:
 361                 case SSL3_ST_SR_CERT_B:
 362                         /* Check for second client hello (MS SGC) */
 363                         ret = ssl3_check_client_hello(s);
 364                         if (ret <= 0)
 365                                 goto end;
 366                         if (ret == 2)
 367                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 368                         else {
 369                                 /* could be sent for a DH cert, even if we
 370                                  * have not asked for it :-) */
 371                                 ret=ssl3_get_client_certificate(s);
 372                                 if (ret <= 0) goto end;
 373                                 s->init_num=0;
 374                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 375                         }
 376                         break;
 377
 378                 case SSL3_ST_SR_KEY_EXCH_A:
 379                 case SSL3_ST_SR_KEY_EXCH_B:
 380                         ret=ssl3_get_client_key_exchange(s);
 381                         if (ret <= 0) goto end;
 382                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 383                         s->init_num=0;
 384
 385                         /* We need to get hashes here so if there is
 386                          * a client cert, it can be verified */
 387                         s->method->ssl3_enc->cert_verify_mac(s,
 388                                 &(s->s3->finish_dgst1),
 389                                 &(s->s3->tmp.cert_verify_md[0]));
 390                         s->method->ssl3_enc->cert_verify_mac(s,
 391                                 &(s->s3->finish_dgst2),
 392                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 393
 394                         break;
 395
 396                 case SSL3_ST_SR_CERT_VRFY_A:
 397                 case SSL3_ST_SR_CERT_VRFY_B:
 398
 399                         /* we should decide if we expected this one */
 400                         ret=ssl3_get_cert_verify(s);
 401                         if (ret <= 0) goto end;
 402
 403                         s->state=SSL3_ST_SR_FINISHED_A;
 404                         s->init_num=0;
 405                         break;
 406
 407                 case SSL3_ST_SR_FINISHED_A:
 408                 case SSL3_ST_SR_FINISHED_B:
 409                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 410                                 SSL3_ST_SR_FINISHED_B);
 411                         if (ret <= 0) goto end;
 412                         if (s->hit)
 413                                 s->state=SSL_ST_OK;
 414                         else
 415                                 s->state=SSL3_ST_SW_CHANGE_A;
 416                         s->init_num=0;
 417                         break;
 418
 419                 case SSL3_ST_SW_CHANGE_A:
 420                 case SSL3_ST_SW_CHANGE_B:
 421
 422                         s->session->cipher=s->s3->tmp.new_cipher;
 423                         if (!s->method->ssl3_enc->setup_key_block(s))
 424                                 { ret= -1; goto end; }
 425
 426                         ret=ssl3_send_change_cipher_spec(s,
 427                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 428
 429                         if (ret <= 0) goto end;
 430                         s->state=SSL3_ST_SW_FINISHED_A;
 431                         s->init_num=0;
 432
 433                         if (!s->method->ssl3_enc->change_cipher_state(s,
 434                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 435                                 {
 436                                 ret= -1;
 437                                 goto end;
 438                                 }
 439
 440                         break;
 441
 442                 case SSL3_ST_SW_FINISHED_A:
 443                 case SSL3_ST_SW_FINISHED_B:
 444                         ret=ssl3_send_finished(s,
 445                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 446                                 s->method->ssl3_enc->server_finished_label,
 447                                 s->method->ssl3_enc->server_finished_label_len);
 448                         if (ret <= 0) goto end;
 449                         s->state=SSL3_ST_SW_FLUSH;
 450                         if (s->hit)
 451                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 452                         else
 453                                 s->s3->tmp.next_state=SSL_ST_OK;
 454                         s->init_num=0;
 455                         break;
 456
 457                 case SSL_ST_OK:
 458                         /* clean a few things up */
 459                         ssl3_cleanup_key_block(s);
 460
 461                         BUF_MEM_free(s->init_buf);
 462                         s->init_buf=NULL;
 463
 464                         /* remove buffering on output */
 465                         ssl_free_wbio_buffer(s);
 466
 467                         s->new_session=0;
 468                         s->init_num=0;
 469
 470                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 471
 472                         s->ctx->stats.sess_accept_good++;
 473                         /* s->server=1; */
 474                         s->handshake_func=ssl3_accept;
 475                         ret=1;
 476
 477                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 478
 479                         goto end;
 480                         /* break; */
 481
 482                 default:
 483                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 484                         ret= -1;
 485                         goto end;
 486                         /* break; */
 487                         }
 488
 489                 if (!s->s3->tmp.reuse_message && !skip)
 490                         {
 491                         if (s->debug)
 492                                 {
 493                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 494                                         goto end;
 495                                 }
 496
 497
 498                         if ((cb != NULL) && (s->state != state))
 499                                 {
 500                                 new_state=s->state;
 501                                 s->state=state;
 502                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 503                                 s->state=new_state;
 504                                 }
 505                         }
 506                 skip=0;
 507                 }
 508 end:
 509         /* BIO_flush(s->wbio); */
 510
 511         if (cb != NULL)
 512                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 513         s->in_handshake--;
 514         return(ret);
 515         }
 516
 517 static int ssl3_send_hello_request(SSL *s)
 518         {
 519         unsigned char *p;
 520
 521         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 522                 {
 523                 p=(unsigned char *)s->init_buf->data;
 524                 *(p++)=SSL3_MT_HELLO_REQUEST;
 525                 *(p++)=0;
 526                 *(p++)=0;
 527                 *(p++)=0;
 528
 529                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 530                 /* number of bytes to write */
 531                 s->init_num=4;
 532                 s->init_off=0;
 533                 }
 534
 535         /* SSL3_ST_SW_HELLO_REQ_B */
 536         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 537         }
 538
 539 static int ssl3_check_client_hello(SSL *s)
 540         {
 541         int ok;
 542         long n;
 543
 544         n=ssl3_get_message(s,
 545                 SSL3_ST_SR_CERT_A,
 546                 SSL3_ST_SR_CERT_B,
 547                 -1,
 548                 SSL3_RT_MAX_PLAIN_LENGTH,
 549                 &ok);
 550         if (!ok) return((int)n);
 551         s->s3->tmp.reuse_message = 1;
 552         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 553                 {
 554                 /* Throw away what we have done so far in the current handshake,
 555                  * which will now be aborted. (A full SSL_clear would be too much.)
 556                  * I hope that tmp.dh is the only thing that may need to be cleared
 557                  * when a handshake is not completed ... */
 558 #ifndef NO_DH
 559                 if (s->s3->tmp.dh != NULL)
 560                         {
 561                         DH_free(s->s3->tmp.dh);
 562                         s->s3->tmp.dh = NULL;
 563                         }
 564 #endif
 565                 return 2;
 566                 }
 567         return 1;
 568 }
 569
 570 static int ssl3_get_client_hello(SSL *s)
 571         {
 572         int i,j,ok,al,ret= -1;
 573         long n;
 574         unsigned long id;
 575         unsigned char *p,*d,*q;
 576         SSL_CIPHER *c;
 577         SSL_COMP *comp=NULL;
 578         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 579
 580         /* We do this so that we will respond with our native type.
 581          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 582          * This down switching should be handled by a different method.
 583          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 584          * TLSv1.
 585          */
 586         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 587                 {
 588                 s->first_packet=1;
 589                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 590                 }
 591         n=ssl3_get_message(s,
 592                 SSL3_ST_SR_CLNT_HELLO_B,
 593                 SSL3_ST_SR_CLNT_HELLO_C,
 594                 SSL3_MT_CLIENT_HELLO,
 595                 SSL3_RT_MAX_PLAIN_LENGTH,
 596                 &ok);
 597
 598         if (!ok) return((int)n);
 599         d=p=(unsigned char *)s->init_buf->data;
 600
 601         /* use version from inside client hello, not from record header
 602          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 603         s->client_version=(((int)p[0])<<8)|(int)p[1];
 604         p+=2;
 605
 606         /* load the client random */
 607         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 608         p+=SSL3_RANDOM_SIZE;
 609
 610         /* get the session-id */
 611         j= *(p++);
 612
 613         s->hit=0;
 614         if (j == 0)
 615                 {
 616                 if (!ssl_get_new_session(s,1))
 617                         goto err;
 618                 }
 619         else
 620                 {
 621                 i=ssl_get_prev_session(s,p,j);
 622                 if (i == 1)
 623                         { /* previous session */
 624                         s->hit=1;
 625                         }
 626                 else if (i == -1)
 627                         goto err;
 628                 else /* i == 0 */
 629                         {
 630                         if (!ssl_get_new_session(s,1))
 631                                 goto err;
 632                         }
 633                 }
 634
 635         p+=j;
 636         n2s(p,i);
 637         if ((i == 0) && (j != 0))
 638                 {
 639                 /* we need a cipher if we are not resuming a session */
 640                 al=SSL_AD_ILLEGAL_PARAMETER;
 641                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 642                 goto f_err;
 643                 }
 644         if ((i+p) > (d+n))
 645                 {
 646                 /* not enough data */
 647                 al=SSL_AD_DECODE_ERROR;
 648                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 649                 goto f_err;
 650                 }
 651         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 652                 == NULL))
 653                 {
 654                 goto err;
 655                 }
 656         p+=i;
 657
 658         /* If it is a hit, check that the cipher is in the list */
 659         if ((s->hit) && (i > 0))
 660                 {
 661                 j=0;
 662                 id=s->session->cipher->id;
 663
 664 #ifdef CIPHER_DEBUG
 665                 printf("client sent %d ciphers\n",sk_num(ciphers));
 666 #endif
 667                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 668                         {
 669                         c=sk_SSL_CIPHER_value(ciphers,i);
 670 #ifdef CIPHER_DEBUG
 671                         printf("client [%2d of %2d]:%s\n",
 672                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 673 #endif
 674                         if (c->id == id)
 675                                 {
 676                                 j=1;
 677                                 break;
 678                                 }
 679                         }
 680                 if (j == 0)
 681                         {
 682                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 683                                 {
 684                                 /* Very bad for multi-threading.... */
 685                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 686                                                                        0);
 687                                 }
 688                         else
 689                                 {
 690                                 /* we need to have the cipher in the cipher
 691                                  * list if we are asked to reuse it */
 692                                 al=SSL_AD_ILLEGAL_PARAMETER;
 693                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 694                                 goto f_err;
 695                                 }
 696                         }
 697                 }
 698
 699         /* compression */
 700         i= *(p++);
 701         q=p;
 702         for (j=0; j<i; j++)
 703                 {
 704                 if (p[j] == 0) break;
 705                 }
 706
 707         p+=i;
 708         if (j >= i)
 709                 {
 710                 /* no compress */
 711                 al=SSL_AD_DECODE_ERROR;
 712                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 713                 goto f_err;
 714                 }
 715
 716         /* Worst case, we will use the NULL compression, but if we have other
 717          * options, we will now look for them.  We have i-1 compression
 718          * algorithms from the client, starting at q. */
 719         s->s3->tmp.new_compression=NULL;
 720         if (s->ctx->comp_methods != NULL)
 721                 { /* See if we have a match */
 722                 int m,nn,o,v,done=0;
 723
 724                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 725                 for (m=0; m<nn; m++)
 726                         {
 727                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 728                         v=comp->id;
 729                         for (o=0; o<i; o++)
 730                                 {
 731                                 if (v == q[o])
 732                                         {
 733                                         done=1;
 734                                         break;
 735                                         }
 736                                 }
 737                         if (done) break;
 738                         }
 739                 if (done)
 740                         s->s3->tmp.new_compression=comp;
 741                 else
 742                         comp=NULL;
 743                 }
 744
 745         /* TLS does not mind if there is extra stuff */
 746         if (s->version == SSL3_VERSION)
 747                 {
 748                 if (p > (d+n))
 749                         {
 750                         /* wrong number of bytes,
 751                          * there could be more to follow */
 752                         al=SSL_AD_DECODE_ERROR;
 753                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 754                         goto f_err;
 755                         }
 756                 }
 757
 758         /* Given s->session->ciphers and SSL_get_ciphers, we must
 759          * pick a cipher */
 760
 761         if (!s->hit)
 762                 {
 763                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 764                 if (s->session->ciphers != NULL)
 765                         sk_SSL_CIPHER_free(s->session->ciphers);
 766                 s->session->ciphers=ciphers;
 767                 if (ciphers == NULL)
 768                         {
 769                         al=SSL_AD_ILLEGAL_PARAMETER;
 770                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 771                         goto f_err;
 772                         }
 773                 ciphers=NULL;
 774                 c=ssl3_choose_cipher(s,s->session->ciphers,
 775                                      SSL_get_ciphers(s));
 776
 777                 if (c == NULL)
 778                         {
 779                         al=SSL_AD_HANDSHAKE_FAILURE;
 780                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 781                         goto f_err;
 782                         }
 783                 s->s3->tmp.new_cipher=c;
 784                 }
 785         else
 786                 {
 787                 /* Session-id reuse */
 788 #ifdef REUSE_CIPHER_BUG
 789                 STACK_OF(SSL_CIPHER) *sk;
 790                 SSL_CIPHER *nc=NULL;
 791                 SSL_CIPHER *ec=NULL;
 792
 793                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 794                         {
 795                         sk=s->session->ciphers;
 796                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 797                                 {
 798                                 c=sk_SSL_CIPHER_value(sk,i);
 799                                 if (c->algorithms & SSL_eNULL)
 800                                         nc=c;
 801                                 if (SSL_C_IS_EXPORT(c))
 802                                         ec=c;
 803                                 }
 804                         if (nc != NULL)
 805                                 s->s3->tmp.new_cipher=nc;
 806                         else if (ec != NULL)
 807                                 s->s3->tmp.new_cipher=ec;
 808                         else
 809                                 s->s3->tmp.new_cipher=s->session->cipher;
 810                         }
 811                 else
 812 #endif
 813                 s->s3->tmp.new_cipher=s->session->cipher;
 814                 }
 815
 816         /* we now have the following setup.
 817          * client_random
 818          * cipher_list          - our prefered list of ciphers
 819          * ciphers              - the clients prefered list of ciphers
 820          * compression          - basically ignored right now
 821          * ssl version is set   - sslv3
 822          * s->session           - The ssl session has been setup.
 823          * s->hit               - session reuse flag
 824          * s->tmp.new_cipher    - the new cipher to use.
 825          */
 826
 827         ret=1;
 828         if (0)
 829                 {
 830 f_err:
 831                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 832                 }
 833 err:
 834         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 835         return(ret);
 836         }
 837
 838 static int ssl3_send_server_hello(SSL *s)
 839         {
 840         unsigned char *buf;
 841         unsigned char *p,*d;
 842         int i,sl;
 843         unsigned long l,Time;
 844
 845         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 846                 {
 847                 buf=(unsigned char *)s->init_buf->data;
 848                 p=s->s3->server_random;
 849                 Time=time(NULL);                        /* Time */
 850                 l2n(Time,p);
 851                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 852                 /* Do the message type and length last */
 853                 d=p= &(buf[4]);
 854
 855                 *(p++)=s->version>>8;
 856                 *(p++)=s->version&0xff;
 857
 858                 /* Random stuff */
 859                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 860                 p+=SSL3_RANDOM_SIZE;
 861
 862                 /* now in theory we have 3 options to sending back the
 863                  * session id.  If it is a re-use, we send back the
 864                  * old session-id, if it is a new session, we send
 865                  * back the new session-id or we send back a 0 length
 866                  * session-id if we want it to be single use.
 867                  * Currently I will not implement the '0' length session-id
 868                  * 12-Jan-98 - I'll now support the '0' length stuff.
 869                  */
 870                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 871                         s->session->session_id_length=0;
 872
 873                 sl=s->session->session_id_length;
 874                 *(p++)=sl;
 875                 memcpy(p,s->session->session_id,sl);
 876                 p+=sl;
 877
 878                 /* put the cipher */
 879                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 880                 p+=i;
 881
 882                 /* put the compression method */
 883                 if (s->s3->tmp.new_compression == NULL)
 884                         *(p++)=0;
 885                 else
 886                         *(p++)=s->s3->tmp.new_compression->id;
 887
 888                 /* do the header */
 889                 l=(p-d);
 890                 d=buf;
 891                 *(d++)=SSL3_MT_SERVER_HELLO;
 892                 l2n3(l,d);
 893
 894                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 895                 /* number of bytes to write */
 896                 s->init_num=p-buf;
 897                 s->init_off=0;
 898                 }
 899
 900         /* SSL3_ST_CW_CLNT_HELLO_B */
 901         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 902         }
 903
 904 static int ssl3_send_server_done(SSL *s)
 905         {
 906         unsigned char *p;
 907
 908         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 909                 {
 910                 p=(unsigned char *)s->init_buf->data;
 911
 912                 /* do the header */
 913                 *(p++)=SSL3_MT_SERVER_DONE;
 914                 *(p++)=0;
 915                 *(p++)=0;
 916                 *(p++)=0;
 917
 918                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 919                 /* number of bytes to write */
 920                 s->init_num=4;
 921                 s->init_off=0;
 922                 }
 923
 924         /* SSL3_ST_CW_CLNT_HELLO_B */
 925         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 926         }
 927
 928 static int ssl3_send_server_key_exchange(SSL *s)
 929         {
 930 #ifndef NO_RSA
 931         unsigned char *q;
 932         int j,num;
 933         RSA *rsa;
 934         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 935         unsigned int u;
 936 #endif
 937 #ifndef NO_DH
 938         DH *dh=NULL,*dhp;
 939 #endif
 940         EVP_PKEY *pkey;
 941         unsigned char *p,*d;
 942         int al,i;
 943         unsigned long type;
 944         int n;
 945         CERT *cert;
 946         BIGNUM *r[4];
 947         int nr[4],kn;
 948         BUF_MEM *buf;
 949         EVP_MD_CTX md_ctx;
 950
 951         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 952                 {
 953                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 954                 cert=s->cert;
 955
 956                 buf=s->init_buf;
 957
 958                 r[0]=r[1]=r[2]=r[3]=NULL;
 959                 n=0;
 960 #ifndef NO_RSA
 961                 if (type & SSL_kRSA)
 962                         {
 963                         rsa=cert->rsa_tmp;
 964                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 965                                 {
 966                                 rsa=s->cert->rsa_tmp_cb(s,
 967                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 968                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 969                                 if(rsa == NULL)
 970                                 {
 971                                         al=SSL_AD_HANDSHAKE_FAILURE;
 972                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 973                                         goto f_err;
 974                                 }
 975                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 976                                 cert->rsa_tmp=rsa;
 977                                 }
 978                         if (rsa == NULL)
 979                                 {
 980                                 al=SSL_AD_HANDSHAKE_FAILURE;
 981                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 982                                 goto f_err;
 983                                 }
 984                         r[0]=rsa->n;
 985                         r[1]=rsa->e;
 986                         s->s3->tmp.use_rsa_tmp=1;
 987                         }
 988                 else
 989 #endif
 990 #ifndef NO_DH
 991                         if (type & SSL_kEDH)
 992                         {
 993                         dhp=cert->dh_tmp;
 994                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 995                                 dhp=s->cert->dh_tmp_cb(s,
 996                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 997                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 998                         if (dhp == NULL)
 999                                 {
1000                                 al=SSL_AD_HANDSHAKE_FAILURE;
1001                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1002                                 goto f_err;
1003                                 }
1004
1005                         if (s->s3->tmp.dh != NULL)
1006                                 {
1007                                 DH_free(dh);
1008                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, SSL_R_INTERNAL_ERROR);
1009                                 goto err;
1010                                 }
1011
1012                         if ((dh=DHparams_dup(dhp)) == NULL)
1013                                 {
1014                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1015                                 goto err;
1016                                 }
1017
1018                         s->s3->tmp.dh=dh;
1019                         if ((dhp->pub_key == NULL ||
1020                              dhp->priv_key == NULL ||
1021                              (s->options & SSL_OP_SINGLE_DH_USE)))
1022                                 {
1023                                 if(!DH_generate_key(dh))
1024                                     {
1025                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1026                                            ERR_R_DH_LIB);
1027                                     goto err;
1028                                     }
1029                                 }
1030                         else
1031                                 {
1032                                 dh->pub_key=BN_dup(dhp->pub_key);
1033                                 dh->priv_key=BN_dup(dhp->priv_key);
1034                                 if ((dh->pub_key == NULL) ||
1035                                         (dh->priv_key == NULL))
1036                                         {
1037                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1038                                         goto err;
1039                                         }
1040                                 }
1041                         r[0]=dh->p;
1042                         r[1]=dh->g;
1043                         r[2]=dh->pub_key;
1044                         }
1045                 else
1046 #endif
1047                         {
1048                         al=SSL_AD_HANDSHAKE_FAILURE;
1049                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1050                         goto f_err;
1051                         }
1052                 for (i=0; r[i] != NULL; i++)
1053                         {
1054                         nr[i]=BN_num_bytes(r[i]);
1055                         n+=2+nr[i];
1056                         }
1057
1058                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1059                         {
1060                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1061                                 == NULL)
1062                                 {
1063                                 al=SSL_AD_DECODE_ERROR;
1064                                 goto f_err;
1065                                 }
1066                         kn=EVP_PKEY_size(pkey);
1067                         }
1068                 else
1069                         {
1070                         pkey=NULL;
1071                         kn=0;
1072                         }
1073
1074                 if (!BUF_MEM_grow(buf,n+4+kn))
1075                         {
1076                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1077                         goto err;
1078                         }
1079                 d=(unsigned char *)s->init_buf->data;
1080                 p= &(d[4]);
1081
1082                 for (i=0; r[i] != NULL; i++)
1083                         {
1084                         s2n(nr[i],p);
1085                         BN_bn2bin(r[i],p);
1086                         p+=nr[i];
1087                         }
1088
1089                 /* not anonymous */
1090                 if (pkey != NULL)
1091                         {
1092                         /* n is the length of the params, they start at &(d[4])
1093                          * and p points to the space at the end. */
1094 #ifndef NO_RSA
1095                         if (pkey->type == EVP_PKEY_RSA)
1096                                 {
1097                                 q=md_buf;
1098                                 j=0;
1099                                 for (num=2; num > 0; num--)
1100                                         {
1101                                         EVP_DigestInit(&md_ctx,(num == 2)
1102                                                 ?s->ctx->md5:s->ctx->sha1);
1103                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1104                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1105                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1106                                         EVP_DigestFinal(&md_ctx,q,
1107                                                 (unsigned int *)&i);
1108                                         q+=i;
1109                                         j+=i;
1110                                         }
1111                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1112                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1113                                         {
1114                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1115                                         goto err;
1116                                         }
1117                                 s2n(u,p);
1118                                 n+=u+2;
1119                                 }
1120                         else
1121 #endif
1122 #if !defined(NO_DSA)
1123                                 if (pkey->type == EVP_PKEY_DSA)
1124                                 {
1125                                 /* lets do DSS */
1126                                 EVP_SignInit(&md_ctx,EVP_dss1());
1127                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1128                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1129                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1130                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1131                                         (unsigned int *)&i,pkey))
1132                                         {
1133                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1134                                         goto err;
1135                                         }
1136                                 s2n(i,p);
1137                                 n+=i+2;
1138                                 }
1139                         else
1140 #endif
1141                                 {
1142                                 /* Is this error check actually needed? */
1143                                 al=SSL_AD_HANDSHAKE_FAILURE;
1144                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1145                                 goto f_err;
1146                                 }
1147                         }
1148
1149                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1150                 l2n3(n,d);
1151
1152                 /* we should now have things packed up, so lets send
1153                  * it off */
1154                 s->init_num=n+4;
1155                 s->init_off=0;
1156                 }
1157
1158         s->state = SSL3_ST_SW_KEY_EXCH_B;
1159         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1160 f_err:
1161         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1162 err:
1163         return(-1);
1164         }
1165
1166 static int ssl3_send_certificate_request(SSL *s)
1167         {
1168         unsigned char *p,*d;
1169         int i,j,nl,off,n;
1170         STACK_OF(X509_NAME) *sk=NULL;
1171         X509_NAME *name;
1172         BUF_MEM *buf;
1173
1174         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1175                 {
1176                 buf=s->init_buf;
1177
1178                 d=p=(unsigned char *)&(buf->data[4]);
1179
1180                 /* get the list of acceptable cert types */
1181                 p++;
1182                 n=ssl3_get_req_cert_type(s,p);
1183                 d[0]=n;
1184                 p+=n;
1185                 n++;
1186
1187                 off=n;
1188                 p+=2;
1189                 n+=2;
1190
1191                 sk=SSL_get_client_CA_list(s);
1192                 nl=0;
1193                 if (sk != NULL)
1194                         {
1195                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1196                                 {
1197                                 name=sk_X509_NAME_value(sk,i);
1198                                 j=i2d_X509_NAME(name,NULL);
1199                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1200                                         {
1201                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1202                                         goto err;
1203                                         }
1204                                 p=(unsigned char *)&(buf->data[4+n]);
1205                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1206                                         {
1207                                         s2n(j,p);
1208                                         i2d_X509_NAME(name,&p);
1209                                         n+=2+j;
1210                                         nl+=2+j;
1211                                         }
1212                                 else
1213                                         {
1214                                         d=p;
1215                                         i2d_X509_NAME(name,&p);
1216                                         j-=2; s2n(j,d); j+=2;
1217                                         n+=j;
1218                                         nl+=j;
1219                                         }
1220                                 }
1221                         }
1222                 /* else no CA names */
1223                 p=(unsigned char *)&(buf->data[4+off]);
1224                 s2n(nl,p);
1225
1226                 d=(unsigned char *)buf->data;
1227                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1228                 l2n3(n,d);
1229
1230                 /* we should now have things packed up, so lets send
1231                  * it off */
1232
1233                 s->init_num=n+4;
1234                 s->init_off=0;
1235 #ifdef NETSCAPE_HANG_BUG
1236                 p=(unsigned char *)s->init_buf->data + s->init_num;
1237
1238                 /* do the header */
1239                 *(p++)=SSL3_MT_SERVER_DONE;
1240                 *(p++)=0;
1241                 *(p++)=0;
1242                 *(p++)=0;
1243                 s->init_num += 4;
1244 #endif
1245
1246                 }
1247
1248         /* SSL3_ST_SW_CERT_REQ_B */
1249         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1250 err:
1251         return(-1);
1252         }
1253
1254 static int ssl3_get_client_key_exchange(SSL *s)
1255         {
1256         int i,al,ok;
1257         long n;
1258         unsigned long l;
1259         unsigned char *p;
1260 #ifndef NO_RSA
1261         RSA *rsa=NULL;
1262         EVP_PKEY *pkey=NULL;
1263 #endif
1264 #ifndef NO_DH
1265         BIGNUM *pub=NULL;
1266         DH *dh_srvr;
1267 #endif
1268 #ifndef NO_KRB5
1269         KSSL_ERR kssl_err;
1270 #endif /* NO_KRB5 */
1271
1272         n=ssl3_get_message(s,
1273                 SSL3_ST_SR_KEY_EXCH_A,
1274                 SSL3_ST_SR_KEY_EXCH_B,
1275                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1276                 2048, /* ??? */
1277                 &ok);
1278
1279         if (!ok) return((int)n);
1280         p=(unsigned char *)s->init_buf->data;
1281
1282         l=s->s3->tmp.new_cipher->algorithms;
1283
1284 #ifndef NO_RSA
1285         if (l & SSL_kRSA)
1286                 {
1287                 /* FIX THIS UP EAY EAY EAY EAY */
1288                 if (s->s3->tmp.use_rsa_tmp)
1289                         {
1290                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1291                                 rsa=s->cert->rsa_tmp;
1292                         /* Don't do a callback because rsa_tmp should
1293                          * be sent already */
1294                         if (rsa == NULL)
1295                                 {
1296                                 al=SSL_AD_HANDSHAKE_FAILURE;
1297                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1298                                 goto f_err;
1299
1300                                 }
1301                         }
1302                 else
1303                         {
1304                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1305                         if (    (pkey == NULL) ||
1306                                 (pkey->type != EVP_PKEY_RSA) ||
1307                                 (pkey->pkey.rsa == NULL))
1308                                 {
1309                                 al=SSL_AD_HANDSHAKE_FAILURE;
1310                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1311                                 goto f_err;
1312                                 }
1313                         rsa=pkey->pkey.rsa;
1314                         }
1315
1316                 /* TLS */
1317                 if (s->version > SSL3_VERSION)
1318                         {
1319                         n2s(p,i);
1320                         if (n != i+2)
1321                                 {
1322                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1323                                         {
1324                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1325                                         goto err;
1326                                         }
1327                                 else
1328                                         p-=2;
1329                                 }
1330                         else
1331                                 n=i;
1332                         }
1333
1334                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1335
1336                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1337                         {
1338                         al=SSL_AD_DECODE_ERROR;
1339                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1340                         goto f_err;
1341                         }
1342
1343                 if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1344                         {
1345                         /* The premaster secret must contain the same version number as the
1346                          * ClientHello to detect version rollback attacks (strangely, the
1347                          * protocol does not offer such protection for DH ciphersuites).
1348                          * However, buggy clients exist that send the negotiated protocol
1349                          * version instead if the server does not support the requested
1350                          * protocol version.
1351                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1352                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1353                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1354                                 {
1355                                 al=SSL_AD_DECODE_ERROR;
1356                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1357                                 goto f_err;
1358                                 }
1359                         }
1360
1361                 s->session->master_key_length=
1362                         s->method->ssl3_enc->generate_master_secret(s,
1363                                 s->session->master_key,
1364                                 p,i);
1365                 memset(p,0,i);
1366                 }
1367         else
1368 #endif
1369 #ifndef NO_DH
1370                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1371                 {
1372                 n2s(p,i);
1373                 if (n != i+2)
1374                         {
1375                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1376                                 {
1377                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1378                                 goto err;
1379                                 }
1380                         else
1381                                 {
1382                                 p-=2;
1383                                 i=(int)n;
1384                                 }
1385                         }
1386
1387                 if (n == 0L) /* the parameters are in the cert */
1388                         {
1389                         al=SSL_AD_HANDSHAKE_FAILURE;
1390                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1391                         goto f_err;
1392                         }
1393                 else
1394                         {
1395                         if (s->s3->tmp.dh == NULL)
1396                                 {
1397                                 al=SSL_AD_HANDSHAKE_FAILURE;
1398                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1399                                 goto f_err;
1400                                 }
1401                         else
1402                                 dh_srvr=s->s3->tmp.dh;
1403                         }
1404
1405                 pub=BN_bin2bn(p,i,NULL);
1406                 if (pub == NULL)
1407                         {
1408                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1409                         goto err;
1410                         }
1411
1412                 i=DH_compute_key(p,pub,dh_srvr);
1413
1414                 if (i <= 0)
1415                         {
1416                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1417                         goto err;
1418                         }
1419
1420                 DH_free(s->s3->tmp.dh);
1421                 s->s3->tmp.dh=NULL;
1422
1423                 BN_clear_free(pub);
1424                 pub=NULL;
1425                 s->session->master_key_length=
1426                         s->method->ssl3_enc->generate_master_secret(s,
1427                                 s->session->master_key,p,i);
1428                 memset(p,0,i);
1429                 }
1430         else
1431 #endif
1432 #ifndef NO_KRB5
1433         if (l & SSL_kKRB5)
1434                 {
1435                 krb5_error_code krb5rc;
1436                 KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1437
1438                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1439                 if ((krb5rc = kssl_sget_tkt(kssl_ctx,
1440                         s->init_buf->data, s->init_buf->length,
1441                         &kssl_err)) != 0)
1442                         {
1443 #ifdef KSSL_DEBUG
1444                         printf("kssl_sget_tkt rtn %d [%d]\n",
1445                                 krb5rc, kssl_err.reason);
1446                         if (kssl_err.text)
1447                                 printf("kssl_err text= %s\n", kssl_err.text);
1448 #endif  /* KSSL_DEBUG */
1449                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1450                                 kssl_err.reason);
1451                         goto err;
1452                         }
1453
1454 #ifdef KSSL_DEBUG
1455                 kssl_ctx_show(kssl_ctx);
1456 #endif  /* KSSL_DEBUG */
1457
1458                 /*      19991013 VRS -  3DES is kind of bogus here,
1459                 **      at least until Kerberos supports 3DES.  The only
1460                 **      real secret is the 8-byte Kerberos session key;
1461                 **      the other key material (client_random, server_random)
1462                 **      could be sniffed.  Nonces may help against replays though.
1463                 **
1464                 **      Alternate code for Kerberos Purists:
1465                 **
1466                 **      memcpy(s->session->master_key,  kssl_ctx->key, kssl_ctx->length);
1467                 **      s->session->master_key_length = kssl_ctx->length;
1468                 */
1469                 s->session->master_key_length=
1470                         s->method->ssl3_enc->generate_master_secret(s,
1471                                 s->session->master_key, kssl_ctx->key, kssl_ctx->length);
1472                 /*      Was doing kssl_ctx_free() here, but it caused problems for apache.
1473                 **      kssl_ctx = kssl_ctx_free(kssl_ctx);
1474                 **      if (s->kssl_ctx)  s->kssl_ctx = NULL;
1475                 */
1476                 }
1477         else
1478 #endif  /* NO_KRB5 */
1479                 {
1480                 al=SSL_AD_HANDSHAKE_FAILURE;
1481                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1482                 goto f_err;
1483                 }
1484
1485         return(1);
1486 f_err:
1487         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1488 #if !defined(NO_DH) || !defined(NO_RSA)
1489 err:
1490 #endif
1491         return(-1);
1492         }
1493
1494 static int ssl3_get_cert_verify(SSL *s)
1495         {
1496         EVP_PKEY *pkey=NULL;
1497         unsigned char *p;
1498         int al,ok,ret=0;
1499         long n;
1500         int type=0,i,j;
1501         X509 *peer;
1502
1503         n=ssl3_get_message(s,
1504                 SSL3_ST_SR_CERT_VRFY_A,
1505                 SSL3_ST_SR_CERT_VRFY_B,
1506                 -1,
1507                 512, /* 512? */
1508                 &ok);
1509
1510         if (!ok) return((int)n);
1511
1512         if (s->session->peer != NULL)
1513                 {
1514                 peer=s->session->peer;
1515                 pkey=X509_get_pubkey(peer);
1516                 type=X509_certificate_type(peer,pkey);
1517                 }
1518         else
1519                 {
1520                 peer=NULL;
1521                 pkey=NULL;
1522                 }
1523
1524         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1525                 {
1526                 s->s3->tmp.reuse_message=1;
1527                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1528                         {
1529                         al=SSL_AD_UNEXPECTED_MESSAGE;
1530                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1531                         goto f_err;
1532                         }
1533                 ret=1;
1534                 goto end;
1535                 }
1536
1537         if (peer == NULL)
1538                 {
1539                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1540                 al=SSL_AD_UNEXPECTED_MESSAGE;
1541                 goto f_err;
1542                 }
1543
1544         if (!(type & EVP_PKT_SIGN))
1545                 {
1546                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1547                 al=SSL_AD_ILLEGAL_PARAMETER;
1548                 goto f_err;
1549                 }
1550
1551         if (s->s3->change_cipher_spec)
1552                 {
1553                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1554                 al=SSL_AD_UNEXPECTED_MESSAGE;
1555                 goto f_err;
1556                 }
1557
1558         /* we now have a signature that we need to verify */
1559         p=(unsigned char *)s->init_buf->data;
1560         n2s(p,i);
1561         n-=2;
1562         if (i > n)
1563                 {
1564                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1565                 al=SSL_AD_DECODE_ERROR;
1566                 goto f_err;
1567                 }
1568
1569         j=EVP_PKEY_size(pkey);
1570         if ((i > j) || (n > j) || (n <= 0))
1571                 {
1572                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1573                 al=SSL_AD_DECODE_ERROR;
1574                 goto f_err;
1575                 }
1576
1577 #ifndef NO_RSA
1578         if (pkey->type == EVP_PKEY_RSA)
1579                 {
1580                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1581                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1582                                                         pkey->pkey.rsa);
1583                 if (i < 0)
1584                         {
1585                         al=SSL_AD_DECRYPT_ERROR;
1586                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1587                         goto f_err;
1588                         }
1589                 if (i == 0)
1590                         {
1591                         al=SSL_AD_DECRYPT_ERROR;
1592                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1593                         goto f_err;
1594                         }
1595                 }
1596         else
1597 #endif
1598 #ifndef NO_DSA
1599                 if (pkey->type == EVP_PKEY_DSA)
1600                 {
1601                 j=DSA_verify(pkey->save_type,
1602                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1603                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1604                 if (j <= 0)
1605                         {
1606                         /* bad signature */
1607                         al=SSL_AD_DECRYPT_ERROR;
1608                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1609                         goto f_err;
1610                         }
1611                 }
1612         else
1613 #endif
1614                 {
1615                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1616                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1617                 goto f_err;
1618                 }
1619
1620
1621         ret=1;
1622         if (0)
1623                 {
1624 f_err:
1625                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1626                 }
1627 end:
1628         EVP_PKEY_free(pkey);
1629         return(ret);
1630         }
1631
1632 static int ssl3_get_client_certificate(SSL *s)
1633         {
1634         int i,ok,al,ret= -1;
1635         X509 *x=NULL;
1636         unsigned long l,nc,llen,n;
1637         unsigned char *p,*d,*q;
1638         STACK_OF(X509) *sk=NULL;
1639
1640         n=ssl3_get_message(s,
1641                 SSL3_ST_SR_CERT_A,
1642                 SSL3_ST_SR_CERT_B,
1643                 -1,
1644 #if defined(MSDOS) && !defined(WIN32)
1645                 1024*30, /* 30k max cert list :-) */
1646 #else
1647                 1024*100, /* 100k max cert list :-) */
1648 #endif
1649                 &ok);
1650
1651         if (!ok) return((int)n);
1652
1653         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1654                 {
1655                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1656                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1657                         {
1658                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1659                         al=SSL_AD_HANDSHAKE_FAILURE;
1660                         goto f_err;
1661                         }
1662                 /* If tls asked for a client cert, the client must return a 0 list */
1663                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1664                         {
1665                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1666                         al=SSL_AD_UNEXPECTED_MESSAGE;
1667                         goto f_err;
1668                         }
1669                 s->s3->tmp.reuse_message=1;
1670                 return(1);
1671                 }
1672
1673         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1674                 {
1675                 al=SSL_AD_UNEXPECTED_MESSAGE;
1676                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1677                 goto f_err;
1678                 }
1679         d=p=(unsigned char *)s->init_buf->data;
1680
1681         if ((sk=sk_X509_new_null()) == NULL)
1682                 {
1683                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1684                 goto err;
1685                 }
1686
1687         n2l3(p,llen);
1688         if (llen+3 != n)
1689                 {
1690                 al=SSL_AD_DECODE_ERROR;
1691                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1692                 goto f_err;
1693                 }
1694         for (nc=0; nc<llen; )
1695                 {
1696                 n2l3(p,l);
1697                 if ((l+nc+3) > llen)
1698                         {
1699                         al=SSL_AD_DECODE_ERROR;
1700                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1701                         goto f_err;
1702                         }
1703
1704                 q=p;
1705                 x=d2i_X509(NULL,&p,l);
1706                 if (x == NULL)
1707                         {
1708                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1709                         goto err;
1710                         }
1711                 if (p != (q+l))
1712                         {
1713                         al=SSL_AD_DECODE_ERROR;
1714                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1715                         goto f_err;
1716                         }
1717                 if (!sk_X509_push(sk,x))
1718                         {
1719                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1720                         goto err;
1721                         }
1722                 x=NULL;
1723                 nc+=l+3;
1724                 }
1725
1726         if (sk_X509_num(sk) <= 0)
1727                 {
1728                 /* TLS does not mind 0 certs returned */
1729                 if (s->version == SSL3_VERSION)
1730                         {
1731                         al=SSL_AD_HANDSHAKE_FAILURE;
1732                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1733                         goto f_err;
1734                         }
1735                 /* Fail for TLS only if we required a certificate */
1736                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1737                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1738                         {
1739                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1740                         al=SSL_AD_HANDSHAKE_FAILURE;
1741                         goto f_err;
1742                         }
1743                 }
1744         else
1745                 {
1746                 i=ssl_verify_cert_chain(s,sk);
1747                 if (!i)
1748                         {
1749                         al=ssl_verify_alarm_type(s->verify_result);
1750                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1751                         goto f_err;
1752                         }
1753                 }
1754
1755         if (s->session->peer != NULL) /* This should not be needed */
1756                 X509_free(s->session->peer);
1757         s->session->peer=sk_X509_shift(sk);
1758         s->session->verify_result = s->verify_result;
1759
1760         /* With the current implementation, sess_cert will always be NULL
1761          * when we arrive here. */
1762         if (s->session->sess_cert == NULL)
1763                 {
1764                 s->session->sess_cert = ssl_sess_cert_new();
1765                 if (s->session->sess_cert == NULL)
1766                         {
1767                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1768                         goto err;
1769                         }
1770                 }
1771         if (s->session->sess_cert->cert_chain != NULL)
1772                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1773         s->session->sess_cert->cert_chain=sk;
1774         /* Inconsistency alert: cert_chain does *not* include the
1775          * peer's own certificate, while we do include it in s3_clnt.c */
1776
1777         sk=NULL;
1778
1779         ret=1;
1780         if (0)
1781                 {
1782 f_err:
1783                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1784                 }
1785 err:
1786         if (x != NULL) X509_free(x);
1787         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1788         return(ret);
1789         }
1790
1791 int ssl3_send_server_certificate(SSL *s)
1792         {
1793         unsigned long l;
1794         X509 *x;
1795
1796         if (s->state == SSL3_ST_SW_CERT_A)
1797                 {
1798                 x=ssl_get_server_send_cert(s);
1799                 if (x == NULL &&
1800                         /* VRS: allow null cert if auth == KRB5 */
1801                         (s->s3->tmp.new_cipher->algorithms
1802                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1803                         != (SSL_aKRB5|SSL_kKRB5))
1804                         {
1805                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1806                         return(0);
1807                         }
1808
1809                 l=ssl3_output_cert_chain(s,x);
1810                 s->state=SSL3_ST_SW_CERT_B;
1811                 s->init_num=(int)l;
1812                 s->init_off=0;
1813                 }
1814
1815         /* SSL3_ST_SW_CERT_B */
1816         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1817         }