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/evp.h>
  68 #include <openssl/x509.h>
  69 #include <openssl/krb5_asn.h>
  70 #include "ssl_locl.h"
  71 #ifndef OPENSSL_NO_KRB5
  72 #include "kssl_lcl.h"
  73 #endif /* OPENSSL_NO_KRB5 */
  74 #include <openssl/md5.h>
  75
  76 static SSL_METHOD *ssl3_get_server_method(int ver);
  77 static int ssl3_get_client_hello(SSL *s);
  78 static int ssl3_check_client_hello(SSL *s);
  79 static int ssl3_send_server_hello(SSL *s);
  80 static int ssl3_send_server_key_exchange(SSL *s);
  81 static int ssl3_send_certificate_request(SSL *s);
  82 static int ssl3_send_server_done(SSL *s);
  83 static int ssl3_get_client_key_exchange(SSL *s);
  84 static int ssl3_get_client_certificate(SSL *s);
  85 static int ssl3_get_cert_verify(SSL *s);
  86 static int ssl3_send_hello_request(SSL *s);
  87
  88 static SSL_METHOD *ssl3_get_server_method(int ver)
  89         {
  90         if (ver == SSL3_VERSION)
  91                 return(SSLv3_server_method());
  92         else
  93                 return(NULL);
  94         }
  95
  96 SSL_METHOD *SSLv3_server_method(void)
  97         {
  98         static int init=1;
  99         static SSL_METHOD SSLv3_server_data;
 100
 101         if (init)
 102                 {
 103                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 104                         sizeof(SSL_METHOD));
 105                 SSLv3_server_data.ssl_accept=ssl3_accept;
 106                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 107                 init=0;
 108                 }
 109         return(&SSLv3_server_data);
 110         }
 111
 112 int ssl3_accept(SSL *s)
 113         {
 114         BUF_MEM *buf;
 115         unsigned long l,Time=time(NULL);
 116         void (*cb)()=NULL;
 117         long num1;
 118         int ret= -1;
 119         int new_state,state,skip=0;
 120
 121         RAND_add(&Time,sizeof(Time),0);
 122         ERR_clear_error();
 123         clear_sys_error();
 124
 125         if (s->info_callback != NULL)
 126                 cb=s->info_callback;
 127         else if (s->ctx->info_callback != NULL)
 128                 cb=s->ctx->info_callback;
 129
 130         /* init things to blank */
 131         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 132         s->in_handshake++;
 133
 134         if (s->cert == NULL)
 135                 {
 136                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 137                 return(-1);
 138                 }
 139
 140         for (;;)
 141                 {
 142                 state=s->state;
 143
 144                 switch (s->state)
 145                         {
 146                 case SSL_ST_RENEGOTIATE:
 147                         s->new_session=1;
 148                         /* s->state=SSL_ST_ACCEPT; */
 149
 150                 case SSL_ST_BEFORE:
 151                 case SSL_ST_ACCEPT:
 152                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 153                 case SSL_ST_OK|SSL_ST_ACCEPT:
 154
 155                         s->server=1;
 156                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 157
 158                         if ((s->version>>8) != 3)
 159                                 {
 160                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 161                                 return -1;
 162                                 }
 163                         s->type=SSL_ST_ACCEPT;
 164
 165                         if (s->init_buf == NULL)
 166                                 {
 167                                 if ((buf=BUF_MEM_new()) == NULL)
 168                                         {
 169                                         ret= -1;
 170                                         goto end;
 171                                         }
 172                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 173                                         {
 174                                         ret= -1;
 175                                         goto end;
 176                                         }
 177                                 s->init_buf=buf;
 178                                 }
 179
 180                         if (!ssl3_setup_buffers(s))
 181                                 {
 182                                 ret= -1;
 183                                 goto end;
 184                                 }
 185
 186                         /* Ok, we now need to push on a buffering BIO so that
 187                          * the output is sent in a way that TCP likes :-)
 188                          */
 189                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 190
 191                         s->init_num=0;
 192
 193                         if (s->state != SSL_ST_RENEGOTIATE)
 194                                 {
 195                                 ssl3_init_finished_mac(s);
 196                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 197                                 s->ctx->stats.sess_accept++;
 198                                 }
 199                         else
 200                                 {
 201                                 s->ctx->stats.sess_accept_renegotiate++;
 202                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 203                                 }
 204                         break;
 205
 206                 case SSL3_ST_SW_HELLO_REQ_A:
 207                 case SSL3_ST_SW_HELLO_REQ_B:
 208
 209                         s->shutdown=0;
 210                         ret=ssl3_send_hello_request(s);
 211                         if (ret <= 0) goto end;
 212                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 213                         s->state=SSL3_ST_SW_FLUSH;
 214                         s->init_num=0;
 215
 216                         ssl3_init_finished_mac(s);
 217                         break;
 218
 219                 case SSL3_ST_SW_HELLO_REQ_C:
 220                         s->state=SSL_ST_OK;
 221                         ret=1;
 222                         goto end;
 223                         /* break; */
 224
 225                 case SSL3_ST_SR_CLNT_HELLO_A:
 226                 case SSL3_ST_SR_CLNT_HELLO_B:
 227                 case SSL3_ST_SR_CLNT_HELLO_C:
 228
 229                         s->shutdown=0;
 230                         ret=ssl3_get_client_hello(s);
 231                         if (ret <= 0) goto end;
 232                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 233                         s->init_num=0;
 234                         break;
 235
 236                 case SSL3_ST_SW_SRVR_HELLO_A:
 237                 case SSL3_ST_SW_SRVR_HELLO_B:
 238                         ret=ssl3_send_server_hello(s);
 239                         if (ret <= 0) goto end;
 240
 241                         if (s->hit)
 242                                 s->state=SSL3_ST_SW_CHANGE_A;
 243                         else
 244                                 s->state=SSL3_ST_SW_CERT_A;
 245                         s->init_num=0;
 246                         break;
 247
 248                 case SSL3_ST_SW_CERT_A:
 249                 case SSL3_ST_SW_CERT_B:
 250                         /* Check if it is anon DH */
 251                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 252                                 {
 253                                 ret=ssl3_send_server_certificate(s);
 254                                 if (ret <= 0) goto end;
 255                                 }
 256                         else
 257                                 skip=1;
 258                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 259                         s->init_num=0;
 260                         break;
 261
 262                 case SSL3_ST_SW_KEY_EXCH_A:
 263                 case SSL3_ST_SW_KEY_EXCH_B:
 264                         l=s->s3->tmp.new_cipher->algorithms;
 265
 266                         /* clear this, it may get reset by
 267                          * send_server_key_exchange */
 268                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 269 #ifndef OPENSSL_NO_KRB5
 270                                 && !(l & SSL_KRB5)
 271 #endif /* OPENSSL_NO_KRB5 */
 272                                 )
 273                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 274                                  * even when forbidden by protocol specs
 275                                  * (handshake may fail as clients are not required to
 276                                  * be able to handle this) */
 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                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 287                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 288                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 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 (/* don't request cert unless asked for it: */
 307                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 308                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 309                                  * don't request cert during re-negotiation: */
 310                                 ((s->session->peer != NULL) &&
 311                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 312                                 /* never request cert in anonymous ciphersuites
 313                                  * (see section "Certificate request" in SSL 3 drafts
 314                                  * and in RFC 2246): */
 315                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 316                                  /* ... except when the application insists on verification
 317                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 318                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 319                                  /* never request cert in Kerberos ciphersuites */
 320                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 321                                 {
 322                                 /* no cert request */
 323                                 skip=1;
 324                                 s->s3->tmp.cert_request=0;
 325                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 326                                 }
 327                         else
 328                                 {
 329                                 s->s3->tmp.cert_request=1;
 330                                 ret=ssl3_send_certificate_request(s);
 331                                 if (ret <= 0) goto end;
 332 #ifndef NETSCAPE_HANG_BUG
 333                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 334 #else
 335                                 s->state=SSL3_ST_SW_FLUSH;
 336                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 337 #endif
 338                                 s->init_num=0;
 339                                 }
 340                         break;
 341
 342                 case SSL3_ST_SW_SRVR_DONE_A:
 343                 case SSL3_ST_SW_SRVR_DONE_B:
 344                         ret=ssl3_send_server_done(s);
 345                         if (ret <= 0) goto end;
 346                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 347                         s->state=SSL3_ST_SW_FLUSH;
 348                         s->init_num=0;
 349                         break;
 350
 351                 case SSL3_ST_SW_FLUSH:
 352                         /* number of bytes to be flushed */
 353                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 354                         if (num1 > 0)
 355                                 {
 356                                 s->rwstate=SSL_WRITING;
 357                                 num1=BIO_flush(s->wbio);
 358                                 if (num1 <= 0) { ret= -1; goto end; }
 359                                 s->rwstate=SSL_NOTHING;
 360                                 }
 361
 362                         s->state=s->s3->tmp.next_state;
 363                         break;
 364
 365                 case SSL3_ST_SR_CERT_A:
 366                 case SSL3_ST_SR_CERT_B:
 367                         /* Check for second client hello (MS SGC) */
 368                         ret = ssl3_check_client_hello(s);
 369                         if (ret <= 0)
 370                                 goto end;
 371                         if (ret == 2)
 372                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 373                         else {
 374                                 /* could be sent for a DH cert, even if we
 375                                  * have not asked for it :-) */
 376                                 ret=ssl3_get_client_certificate(s);
 377                                 if (ret <= 0) goto end;
 378                                 s->init_num=0;
 379                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 380                         }
 381                         break;
 382
 383                 case SSL3_ST_SR_KEY_EXCH_A:
 384                 case SSL3_ST_SR_KEY_EXCH_B:
 385                         ret=ssl3_get_client_key_exchange(s);
 386                         if (ret <= 0) goto end;
 387                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 388                         s->init_num=0;
 389
 390                         /* We need to get hashes here so if there is
 391                          * a client cert, it can be verified */
 392                         s->method->ssl3_enc->cert_verify_mac(s,
 393                                 &(s->s3->finish_dgst1),
 394                                 &(s->s3->tmp.cert_verify_md[0]));
 395                         s->method->ssl3_enc->cert_verify_mac(s,
 396                                 &(s->s3->finish_dgst2),
 397                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 398
 399                         break;
 400
 401                 case SSL3_ST_SR_CERT_VRFY_A:
 402                 case SSL3_ST_SR_CERT_VRFY_B:
 403
 404                         /* we should decide if we expected this one */
 405                         ret=ssl3_get_cert_verify(s);
 406                         if (ret <= 0) goto end;
 407
 408                         s->state=SSL3_ST_SR_FINISHED_A;
 409                         s->init_num=0;
 410                         break;
 411
 412                 case SSL3_ST_SR_FINISHED_A:
 413                 case SSL3_ST_SR_FINISHED_B:
 414                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 415                                 SSL3_ST_SR_FINISHED_B);
 416                         if (ret <= 0) goto end;
 417                         if (s->hit)
 418                                 s->state=SSL_ST_OK;
 419                         else
 420                                 s->state=SSL3_ST_SW_CHANGE_A;
 421                         s->init_num=0;
 422                         break;
 423
 424                 case SSL3_ST_SW_CHANGE_A:
 425                 case SSL3_ST_SW_CHANGE_B:
 426
 427                         s->session->cipher=s->s3->tmp.new_cipher;
 428                         if (!s->method->ssl3_enc->setup_key_block(s))
 429                                 { ret= -1; goto end; }
 430
 431                         ret=ssl3_send_change_cipher_spec(s,
 432                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 433
 434                         if (ret <= 0) goto end;
 435                         s->state=SSL3_ST_SW_FINISHED_A;
 436                         s->init_num=0;
 437
 438                         if (!s->method->ssl3_enc->change_cipher_state(s,
 439                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 440                                 {
 441                                 ret= -1;
 442                                 goto end;
 443                                 }
 444
 445                         break;
 446
 447                 case SSL3_ST_SW_FINISHED_A:
 448                 case SSL3_ST_SW_FINISHED_B:
 449                         ret=ssl3_send_finished(s,
 450                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 451                                 s->method->ssl3_enc->server_finished_label,
 452                                 s->method->ssl3_enc->server_finished_label_len);
 453                         if (ret <= 0) goto end;
 454                         s->state=SSL3_ST_SW_FLUSH;
 455                         if (s->hit)
 456                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 457                         else
 458                                 s->s3->tmp.next_state=SSL_ST_OK;
 459                         s->init_num=0;
 460                         break;
 461
 462                 case SSL_ST_OK:
 463                         /* clean a few things up */
 464                         ssl3_cleanup_key_block(s);
 465
 466                         BUF_MEM_free(s->init_buf);
 467                         s->init_buf=NULL;
 468
 469                         /* remove buffering on output */
 470                         ssl_free_wbio_buffer(s);
 471
 472                         s->new_session=0;
 473                         s->init_num=0;
 474
 475                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 476
 477                         s->ctx->stats.sess_accept_good++;
 478                         /* s->server=1; */
 479                         s->handshake_func=ssl3_accept;
 480                         ret=1;
 481
 482                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 483
 484                         goto end;
 485                         /* break; */
 486
 487                 default:
 488                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 489                         ret= -1;
 490                         goto end;
 491                         /* break; */
 492                         }
 493
 494                 if (!s->s3->tmp.reuse_message && !skip)
 495                         {
 496                         if (s->debug)
 497                                 {
 498                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 499                                         goto end;
 500                                 }
 501
 502
 503                         if ((cb != NULL) && (s->state != state))
 504                                 {
 505                                 new_state=s->state;
 506                                 s->state=state;
 507                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 508                                 s->state=new_state;
 509                                 }
 510                         }
 511                 skip=0;
 512                 }
 513 end:
 514         /* BIO_flush(s->wbio); */
 515
 516         if (cb != NULL)
 517                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 518         s->in_handshake--;
 519         return(ret);
 520         }
 521
 522 static int ssl3_send_hello_request(SSL *s)
 523         {
 524         unsigned char *p;
 525
 526         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 527                 {
 528                 p=(unsigned char *)s->init_buf->data;
 529                 *(p++)=SSL3_MT_HELLO_REQUEST;
 530                 *(p++)=0;
 531                 *(p++)=0;
 532                 *(p++)=0;
 533
 534                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 535                 /* number of bytes to write */
 536                 s->init_num=4;
 537                 s->init_off=0;
 538                 }
 539
 540         /* SSL3_ST_SW_HELLO_REQ_B */
 541         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 542         }
 543
 544 static int ssl3_check_client_hello(SSL *s)
 545         {
 546         int ok;
 547         long n;
 548
 549         n=ssl3_get_message(s,
 550                 SSL3_ST_SR_CERT_A,
 551                 SSL3_ST_SR_CERT_B,
 552                 -1,
 553 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN32)
 554                 1024*30, /* 30k max cert list :-) */
 555 #else
 556                 1024*100, /* 100k max cert list :-) */
 557 #endif
 558                 &ok);
 559         if (!ok) return((int)n);
 560         s->s3->tmp.reuse_message = 1;
 561         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 562                 {
 563                 /* Throw away what we have done so far in the current handshake,
 564                  * which will now be aborted. (A full SSL_clear would be too much.)
 565                  * I hope that tmp.dh is the only thing that may need to be cleared
 566                  * when a handshake is not completed ... */
 567 #ifndef OPENSSL_NO_DH
 568                 if (s->s3->tmp.dh != NULL)
 569                         {
 570                         DH_free(s->s3->tmp.dh);
 571                         s->s3->tmp.dh = NULL;
 572                         }
 573 #endif
 574                 return 2;
 575                 }
 576         return 1;
 577 }
 578
 579 static int ssl3_get_client_hello(SSL *s)
 580         {
 581         int i,j,ok,al,ret= -1;
 582         long n;
 583         unsigned long id;
 584         unsigned char *p,*d,*q;
 585         SSL_CIPHER *c;
 586         SSL_COMP *comp=NULL;
 587         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 588
 589         /* We do this so that we will respond with our native type.
 590          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 591          * This down switching should be handled by a different method.
 592          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 593          * TLSv1.
 594          */
 595         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 596                 {
 597                 s->first_packet=1;
 598                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 599                 }
 600         n=ssl3_get_message(s,
 601                 SSL3_ST_SR_CLNT_HELLO_B,
 602                 SSL3_ST_SR_CLNT_HELLO_C,
 603                 SSL3_MT_CLIENT_HELLO,
 604                 SSL3_RT_MAX_PLAIN_LENGTH,
 605                 &ok);
 606
 607         if (!ok) return((int)n);
 608         d=p=(unsigned char *)s->init_buf->data;
 609
 610         /* use version from inside client hello, not from record header
 611          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 612         s->client_version=(((int)p[0])<<8)|(int)p[1];
 613         p+=2;
 614
 615         /* load the client random */
 616         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 617         p+=SSL3_RANDOM_SIZE;
 618
 619         /* get the session-id */
 620         j= *(p++);
 621
 622         s->hit=0;
 623         if (j == 0)
 624                 {
 625                 if (!ssl_get_new_session(s,1))
 626                         goto err;
 627                 }
 628         else
 629                 {
 630                 i=ssl_get_prev_session(s,p,j);
 631                 if (i == 1)
 632                         { /* previous session */
 633                         s->hit=1;
 634                         }
 635                 else if (i == -1)
 636                         goto err;
 637                 else /* i == 0 */
 638                         {
 639                         if (!ssl_get_new_session(s,1))
 640                                 goto err;
 641                         }
 642                 }
 643
 644         p+=j;
 645         n2s(p,i);
 646         if ((i == 0) && (j != 0))
 647                 {
 648                 /* we need a cipher if we are not resuming a session */
 649                 al=SSL_AD_ILLEGAL_PARAMETER;
 650                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 651                 goto f_err;
 652                 }
 653         if ((i+p) > (d+n))
 654                 {
 655                 /* not enough data */
 656                 al=SSL_AD_DECODE_ERROR;
 657                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 658                 goto f_err;
 659                 }
 660         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 661                 == NULL))
 662                 {
 663                 goto err;
 664                 }
 665         p+=i;
 666
 667         /* If it is a hit, check that the cipher is in the list */
 668         if ((s->hit) && (i > 0))
 669                 {
 670                 j=0;
 671                 id=s->session->cipher->id;
 672
 673 #ifdef CIPHER_DEBUG
 674                 printf("client sent %d ciphers\n",sk_num(ciphers));
 675 #endif
 676                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 677                         {
 678                         c=sk_SSL_CIPHER_value(ciphers,i);
 679 #ifdef CIPHER_DEBUG
 680                         printf("client [%2d of %2d]:%s\n",
 681                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 682 #endif
 683                         if (c->id == id)
 684                                 {
 685                                 j=1;
 686                                 break;
 687                                 }
 688                         }
 689                 if (j == 0)
 690                         {
 691                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 692                                 {
 693                                 /* Very bad for multi-threading.... */
 694                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 695                                                                        0);
 696                                 }
 697                         else
 698                                 {
 699                                 /* we need to have the cipher in the cipher
 700                                  * list if we are asked to reuse it */
 701                                 al=SSL_AD_ILLEGAL_PARAMETER;
 702                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 703                                 goto f_err;
 704                                 }
 705                         }
 706                 }
 707
 708         /* compression */
 709         i= *(p++);
 710         q=p;
 711         for (j=0; j<i; j++)
 712                 {
 713                 if (p[j] == 0) break;
 714                 }
 715
 716         p+=i;
 717         if (j >= i)
 718                 {
 719                 /* no compress */
 720                 al=SSL_AD_DECODE_ERROR;
 721                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 722                 goto f_err;
 723                 }
 724
 725         /* Worst case, we will use the NULL compression, but if we have other
 726          * options, we will now look for them.  We have i-1 compression
 727          * algorithms from the client, starting at q. */
 728         s->s3->tmp.new_compression=NULL;
 729         if (s->ctx->comp_methods != NULL)
 730                 { /* See if we have a match */
 731                 int m,nn,o,v,done=0;
 732
 733                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 734                 for (m=0; m<nn; m++)
 735                         {
 736                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 737                         v=comp->id;
 738                         for (o=0; o<i; o++)
 739                                 {
 740                                 if (v == q[o])
 741                                         {
 742                                         done=1;
 743                                         break;
 744                                         }
 745                                 }
 746                         if (done) break;
 747                         }
 748                 if (done)
 749                         s->s3->tmp.new_compression=comp;
 750                 else
 751                         comp=NULL;
 752                 }
 753
 754         /* TLS does not mind if there is extra stuff */
 755         if (s->version == SSL3_VERSION)
 756                 {
 757                 if (p > (d+n))
 758                         {
 759                         /* wrong number of bytes,
 760                          * there could be more to follow */
 761                         al=SSL_AD_DECODE_ERROR;
 762                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 763                         goto f_err;
 764                         }
 765                 }
 766
 767         /* Given s->session->ciphers and SSL_get_ciphers, we must
 768          * pick a cipher */
 769
 770         if (!s->hit)
 771                 {
 772                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 773                 if (s->session->ciphers != NULL)
 774                         sk_SSL_CIPHER_free(s->session->ciphers);
 775                 s->session->ciphers=ciphers;
 776                 if (ciphers == NULL)
 777                         {
 778                         al=SSL_AD_ILLEGAL_PARAMETER;
 779                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 780                         goto f_err;
 781                         }
 782                 ciphers=NULL;
 783                 c=ssl3_choose_cipher(s,s->session->ciphers,
 784                                      SSL_get_ciphers(s));
 785
 786                 if (c == NULL)
 787                         {
 788                         al=SSL_AD_HANDSHAKE_FAILURE;
 789                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 790                         goto f_err;
 791                         }
 792                 s->s3->tmp.new_cipher=c;
 793                 }
 794         else
 795                 {
 796                 /* Session-id reuse */
 797 #ifdef REUSE_CIPHER_BUG
 798                 STACK_OF(SSL_CIPHER) *sk;
 799                 SSL_CIPHER *nc=NULL;
 800                 SSL_CIPHER *ec=NULL;
 801
 802                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 803                         {
 804                         sk=s->session->ciphers;
 805                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 806                                 {
 807                                 c=sk_SSL_CIPHER_value(sk,i);
 808                                 if (c->algorithms & SSL_eNULL)
 809                                         nc=c;
 810                                 if (SSL_C_IS_EXPORT(c))
 811                                         ec=c;
 812                                 }
 813                         if (nc != NULL)
 814                                 s->s3->tmp.new_cipher=nc;
 815                         else if (ec != NULL)
 816                                 s->s3->tmp.new_cipher=ec;
 817                         else
 818                                 s->s3->tmp.new_cipher=s->session->cipher;
 819                         }
 820                 else
 821 #endif
 822                 s->s3->tmp.new_cipher=s->session->cipher;
 823                 }
 824
 825         /* we now have the following setup.
 826          * client_random
 827          * cipher_list          - our prefered list of ciphers
 828          * ciphers              - the clients prefered list of ciphers
 829          * compression          - basically ignored right now
 830          * ssl version is set   - sslv3
 831          * s->session           - The ssl session has been setup.
 832          * s->hit               - session reuse flag
 833          * s->tmp.new_cipher    - the new cipher to use.
 834          */
 835
 836         ret=1;
 837         if (0)
 838                 {
 839 f_err:
 840                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 841                 }
 842 err:
 843         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 844         return(ret);
 845         }
 846
 847 static int ssl3_send_server_hello(SSL *s)
 848         {
 849         unsigned char *buf;
 850         unsigned char *p,*d;
 851         int i,sl;
 852         unsigned long l,Time;
 853
 854         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 855                 {
 856                 buf=(unsigned char *)s->init_buf->data;
 857                 p=s->s3->server_random;
 858                 Time=time(NULL);                        /* Time */
 859                 l2n(Time,p);
 860                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 861                 /* Do the message type and length last */
 862                 d=p= &(buf[4]);
 863
 864                 *(p++)=s->version>>8;
 865                 *(p++)=s->version&0xff;
 866
 867                 /* Random stuff */
 868                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 869                 p+=SSL3_RANDOM_SIZE;
 870
 871                 /* now in theory we have 3 options to sending back the
 872                  * session id.  If it is a re-use, we send back the
 873                  * old session-id, if it is a new session, we send
 874                  * back the new session-id or we send back a 0 length
 875                  * session-id if we want it to be single use.
 876                  * Currently I will not implement the '0' length session-id
 877                  * 12-Jan-98 - I'll now support the '0' length stuff.
 878                  */
 879                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 880                         s->session->session_id_length=0;
 881
 882                 sl=s->session->session_id_length;
 883                 *(p++)=sl;
 884                 memcpy(p,s->session->session_id,sl);
 885                 p+=sl;
 886
 887                 /* put the cipher */
 888                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 889                 p+=i;
 890
 891                 /* put the compression method */
 892                 if (s->s3->tmp.new_compression == NULL)
 893                         *(p++)=0;
 894                 else
 895                         *(p++)=s->s3->tmp.new_compression->id;
 896
 897                 /* do the header */
 898                 l=(p-d);
 899                 d=buf;
 900                 *(d++)=SSL3_MT_SERVER_HELLO;
 901                 l2n3(l,d);
 902
 903                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 904                 /* number of bytes to write */
 905                 s->init_num=p-buf;
 906                 s->init_off=0;
 907                 }
 908
 909         /* SSL3_ST_CW_CLNT_HELLO_B */
 910         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 911         }
 912
 913 static int ssl3_send_server_done(SSL *s)
 914         {
 915         unsigned char *p;
 916
 917         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 918                 {
 919                 p=(unsigned char *)s->init_buf->data;
 920
 921                 /* do the header */
 922                 *(p++)=SSL3_MT_SERVER_DONE;
 923                 *(p++)=0;
 924                 *(p++)=0;
 925                 *(p++)=0;
 926
 927                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 928                 /* number of bytes to write */
 929                 s->init_num=4;
 930                 s->init_off=0;
 931                 }
 932
 933         /* SSL3_ST_CW_CLNT_HELLO_B */
 934         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 935         }
 936
 937 static int ssl3_send_server_key_exchange(SSL *s)
 938         {
 939 #ifndef OPENSSL_NO_RSA
 940         unsigned char *q;
 941         int j,num;
 942         RSA *rsa;
 943         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 944         unsigned int u;
 945 #endif
 946 #ifndef OPENSSL_NO_DH
 947         DH *dh=NULL,*dhp;
 948 #endif
 949         EVP_PKEY *pkey;
 950         unsigned char *p,*d;
 951         int al,i;
 952         unsigned long type;
 953         int n;
 954         CERT *cert;
 955         BIGNUM *r[4];
 956         int nr[4],kn;
 957         BUF_MEM *buf;
 958         EVP_MD_CTX md_ctx;
 959
 960         EVP_MD_CTX_init(&md_ctx);
 961         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 962                 {
 963                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 964                 cert=s->cert;
 965
 966                 buf=s->init_buf;
 967
 968                 r[0]=r[1]=r[2]=r[3]=NULL;
 969                 n=0;
 970 #ifndef OPENSSL_NO_RSA
 971                 if (type & SSL_kRSA)
 972                         {
 973                         rsa=cert->rsa_tmp;
 974                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 975                                 {
 976                                 rsa=s->cert->rsa_tmp_cb(s,
 977                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 978                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 979                                 if(rsa == NULL)
 980                                 {
 981                                         al=SSL_AD_HANDSHAKE_FAILURE;
 982                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 983                                         goto f_err;
 984                                 }
 985                                 RSA_up_ref(rsa);
 986                                 cert->rsa_tmp=rsa;
 987                                 }
 988                         if (rsa == NULL)
 989                                 {
 990                                 al=SSL_AD_HANDSHAKE_FAILURE;
 991                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 992                                 goto f_err;
 993                                 }
 994                         r[0]=rsa->n;
 995                         r[1]=rsa->e;
 996                         s->s3->tmp.use_rsa_tmp=1;
 997                         }
 998                 else
 999 #endif
1000 #ifndef OPENSSL_NO_DH
1001                         if (type & SSL_kEDH)
1002                         {
1003                         dhp=cert->dh_tmp;
1004                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1005                                 dhp=s->cert->dh_tmp_cb(s,
1006                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1007                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1008                         if (dhp == NULL)
1009                                 {
1010                                 al=SSL_AD_HANDSHAKE_FAILURE;
1011                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1012                                 goto f_err;
1013                                 }
1014
1015                         if (s->s3->tmp.dh != NULL)
1016                                 {
1017                                 DH_free(dh);
1018                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1019                                 goto err;
1020                                 }
1021
1022                         if ((dh=DHparams_dup(dhp)) == NULL)
1023                                 {
1024                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1025                                 goto err;
1026                                 }
1027
1028                         s->s3->tmp.dh=dh;
1029                         if ((dhp->pub_key == NULL ||
1030                              dhp->priv_key == NULL ||
1031                              (s->options & SSL_OP_SINGLE_DH_USE)))
1032                                 {
1033                                 if(!DH_generate_key(dh))
1034                                     {
1035                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1036                                            ERR_R_DH_LIB);
1037                                     goto err;
1038                                     }
1039                                 }
1040                         else
1041                                 {
1042                                 dh->pub_key=BN_dup(dhp->pub_key);
1043                                 dh->priv_key=BN_dup(dhp->priv_key);
1044                                 if ((dh->pub_key == NULL) ||
1045                                         (dh->priv_key == NULL))
1046                                         {
1047                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1048                                         goto err;
1049                                         }
1050                                 }
1051                         r[0]=dh->p;
1052                         r[1]=dh->g;
1053                         r[2]=dh->pub_key;
1054                         }
1055                 else
1056 #endif
1057                         {
1058                         al=SSL_AD_HANDSHAKE_FAILURE;
1059                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1060                         goto f_err;
1061                         }
1062                 for (i=0; r[i] != NULL; i++)
1063                         {
1064                         nr[i]=BN_num_bytes(r[i]);
1065                         n+=2+nr[i];
1066                         }
1067
1068                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1069                         {
1070                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1071                                 == NULL)
1072                                 {
1073                                 al=SSL_AD_DECODE_ERROR;
1074                                 goto f_err;
1075                                 }
1076                         kn=EVP_PKEY_size(pkey);
1077                         }
1078                 else
1079                         {
1080                         pkey=NULL;
1081                         kn=0;
1082                         }
1083
1084                 if (!BUF_MEM_grow(buf,n+4+kn))
1085                         {
1086                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1087                         goto err;
1088                         }
1089                 d=(unsigned char *)s->init_buf->data;
1090                 p= &(d[4]);
1091
1092                 for (i=0; r[i] != NULL; i++)
1093                         {
1094                         s2n(nr[i],p);
1095                         BN_bn2bin(r[i],p);
1096                         p+=nr[i];
1097                         }
1098
1099                 /* not anonymous */
1100                 if (pkey != NULL)
1101                         {
1102                         /* n is the length of the params, they start at &(d[4])
1103                          * and p points to the space at the end. */
1104 #ifndef OPENSSL_NO_RSA
1105                         if (pkey->type == EVP_PKEY_RSA)
1106                                 {
1107                                 q=md_buf;
1108                                 j=0;
1109                                 for (num=2; num > 0; num--)
1110                                         {
1111                                         EVP_DigestInit(&md_ctx,(num == 2)
1112                                                 ?s->ctx->md5:s->ctx->sha1);
1113                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1114                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1115                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1116                                         EVP_DigestFinal(&md_ctx,q,
1117                                                 (unsigned int *)&i);
1118                                         q+=i;
1119                                         j+=i;
1120                                         }
1121                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1122                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1123                                         {
1124                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1125                                         goto err;
1126                                         }
1127                                 s2n(u,p);
1128                                 n+=u+2;
1129                                 }
1130                         else
1131 #endif
1132 #if !defined(OPENSSL_NO_DSA)
1133                                 if (pkey->type == EVP_PKEY_DSA)
1134                                 {
1135                                 /* lets do DSS */
1136                                 EVP_SignInit(&md_ctx,EVP_dss1());
1137                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1138                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1139                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1140                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1141                                         (unsigned int *)&i,pkey))
1142                                         {
1143                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1144                                         goto err;
1145                                         }
1146                                 s2n(i,p);
1147                                 n+=i+2;
1148                                 }
1149                         else
1150 #endif
1151                                 {
1152                                 /* Is this error check actually needed? */
1153                                 al=SSL_AD_HANDSHAKE_FAILURE;
1154                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1155                                 goto f_err;
1156                                 }
1157                         }
1158
1159                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1160                 l2n3(n,d);
1161
1162                 /* we should now have things packed up, so lets send
1163                  * it off */
1164                 s->init_num=n+4;
1165                 s->init_off=0;
1166                 }
1167
1168         s->state = SSL3_ST_SW_KEY_EXCH_B;
1169         EVP_MD_CTX_cleanup(&md_ctx);
1170         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1171 f_err:
1172         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1173 err:
1174         EVP_MD_CTX_cleanup(&md_ctx);
1175         return(-1);
1176         }
1177
1178 static int ssl3_send_certificate_request(SSL *s)
1179         {
1180         unsigned char *p,*d;
1181         int i,j,nl,off,n;
1182         STACK_OF(X509_NAME) *sk=NULL;
1183         X509_NAME *name;
1184         BUF_MEM *buf;
1185
1186         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1187                 {
1188                 buf=s->init_buf;
1189
1190                 d=p=(unsigned char *)&(buf->data[4]);
1191
1192                 /* get the list of acceptable cert types */
1193                 p++;
1194                 n=ssl3_get_req_cert_type(s,p);
1195                 d[0]=n;
1196                 p+=n;
1197                 n++;
1198
1199                 off=n;
1200                 p+=2;
1201                 n+=2;
1202
1203                 sk=SSL_get_client_CA_list(s);
1204                 nl=0;
1205                 if (sk != NULL)
1206                         {
1207                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1208                                 {
1209                                 name=sk_X509_NAME_value(sk,i);
1210                                 j=i2d_X509_NAME(name,NULL);
1211                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1212                                         {
1213                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1214                                         goto err;
1215                                         }
1216                                 p=(unsigned char *)&(buf->data[4+n]);
1217                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1218                                         {
1219                                         s2n(j,p);
1220                                         i2d_X509_NAME(name,&p);
1221                                         n+=2+j;
1222                                         nl+=2+j;
1223                                         }
1224                                 else
1225                                         {
1226                                         d=p;
1227                                         i2d_X509_NAME(name,&p);
1228                                         j-=2; s2n(j,d); j+=2;
1229                                         n+=j;
1230                                         nl+=j;
1231                                         }
1232                                 }
1233                         }
1234                 /* else no CA names */
1235                 p=(unsigned char *)&(buf->data[4+off]);
1236                 s2n(nl,p);
1237
1238                 d=(unsigned char *)buf->data;
1239                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1240                 l2n3(n,d);
1241
1242                 /* we should now have things packed up, so lets send
1243                  * it off */
1244
1245                 s->init_num=n+4;
1246                 s->init_off=0;
1247 #ifdef NETSCAPE_HANG_BUG
1248                 p=(unsigned char *)s->init_buf->data + s->init_num;
1249
1250                 /* do the header */
1251                 *(p++)=SSL3_MT_SERVER_DONE;
1252                 *(p++)=0;
1253                 *(p++)=0;
1254                 *(p++)=0;
1255                 s->init_num += 4;
1256 #endif
1257
1258                 }
1259
1260         /* SSL3_ST_SW_CERT_REQ_B */
1261         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1262 err:
1263         return(-1);
1264         }
1265
1266 static int ssl3_get_client_key_exchange(SSL *s)
1267         {
1268         int i,al,ok;
1269         long n;
1270         unsigned long l;
1271         unsigned char *p;
1272 #ifndef OPENSSL_NO_RSA
1273         RSA *rsa=NULL;
1274         EVP_PKEY *pkey=NULL;
1275 #endif
1276 #ifndef OPENSSL_NO_DH
1277         BIGNUM *pub=NULL;
1278         DH *dh_srvr;
1279 #endif
1280 #ifndef OPENSSL_NO_KRB5
1281         KSSL_ERR kssl_err;
1282 #endif /* OPENSSL_NO_KRB5 */
1283
1284         n=ssl3_get_message(s,
1285                 SSL3_ST_SR_KEY_EXCH_A,
1286                 SSL3_ST_SR_KEY_EXCH_B,
1287                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1288                 2048, /* ??? */
1289                 &ok);
1290
1291         if (!ok) return((int)n);
1292         p=(unsigned char *)s->init_buf->data;
1293
1294         l=s->s3->tmp.new_cipher->algorithms;
1295
1296 #ifndef OPENSSL_NO_RSA
1297         if (l & SSL_kRSA)
1298                 {
1299                 /* FIX THIS UP EAY EAY EAY EAY */
1300                 if (s->s3->tmp.use_rsa_tmp)
1301                         {
1302                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1303                                 rsa=s->cert->rsa_tmp;
1304                         /* Don't do a callback because rsa_tmp should
1305                          * be sent already */
1306                         if (rsa == NULL)
1307                                 {
1308                                 al=SSL_AD_HANDSHAKE_FAILURE;
1309                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1310                                 goto f_err;
1311
1312                                 }
1313                         }
1314                 else
1315                         {
1316                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1317                         if (    (pkey == NULL) ||
1318                                 (pkey->type != EVP_PKEY_RSA) ||
1319                                 (pkey->pkey.rsa == NULL))
1320                                 {
1321                                 al=SSL_AD_HANDSHAKE_FAILURE;
1322                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1323                                 goto f_err;
1324                                 }
1325                         rsa=pkey->pkey.rsa;
1326                         }
1327
1328                 /* TLS */
1329                 if (s->version > SSL3_VERSION)
1330                         {
1331                         n2s(p,i);
1332                         if (n != i+2)
1333                                 {
1334                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1335                                         {
1336                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1337                                         goto err;
1338                                         }
1339                                 else
1340                                         p-=2;
1341                                 }
1342                         else
1343                                 n=i;
1344                         }
1345
1346                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1347
1348                 al = -1;
1349
1350                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1351                         {
1352                         al=SSL_AD_DECODE_ERROR;
1353                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1354                         }
1355
1356                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1357                         {
1358                         /* The premaster secret must contain the same version number as the
1359                          * ClientHello to detect version rollback attacks (strangely, the
1360                          * protocol does not offer such protection for DH ciphersuites).
1361                          * However, buggy clients exist that send the negotiated protocol
1362                          * version instead if the server does not support the requested
1363                          * protocol version.
1364                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1365                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1366                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1367                                 {
1368                                 al=SSL_AD_DECODE_ERROR;
1369                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1370                                 goto f_err;
1371                                 }
1372                         }
1373
1374                 if (al != -1)
1375                         {
1376 #if 0
1377                         goto f_err;
1378 #else
1379                         /* Some decryption failure -- use random value instead as countermeasure
1380                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1381                          * (see RFC 2246, section 7.4.7.1).
1382                          * But note that due to length and protocol version checking, the
1383                          * attack is impractical anyway (see section 5 in D. Bleichenbacher:
1384                          * "Chosen Ciphertext Attacks Against Protocols Based on the RSA
1385                          * Encryption Standard PKCS #1", CRYPTO '98, LNCS 1462, pp. 1-12).
1386                          */
1387                         ERR_clear_error();
1388                         i = SSL_MAX_MASTER_KEY_LENGTH;
1389                         p[0] = s->client_version >> 8;
1390                         p[1] = s->client_version & 0xff;
1391                         RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */
1392 #endif
1393                         }
1394
1395                 s->session->master_key_length=
1396                         s->method->ssl3_enc->generate_master_secret(s,
1397                                 s->session->master_key,
1398                                 p,i);
1399                 memset(p,0,i);
1400                 }
1401         else
1402 #endif
1403 #ifndef OPENSSL_NO_DH
1404                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1405                 {
1406                 n2s(p,i);
1407                 if (n != i+2)
1408                         {
1409                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1410                                 {
1411                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1412                                 goto err;
1413                                 }
1414                         else
1415                                 {
1416                                 p-=2;
1417                                 i=(int)n;
1418                                 }
1419                         }
1420
1421                 if (n == 0L) /* the parameters are in the cert */
1422                         {
1423                         al=SSL_AD_HANDSHAKE_FAILURE;
1424                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1425                         goto f_err;
1426                         }
1427                 else
1428                         {
1429                         if (s->s3->tmp.dh == NULL)
1430                                 {
1431                                 al=SSL_AD_HANDSHAKE_FAILURE;
1432                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1433                                 goto f_err;
1434                                 }
1435                         else
1436                                 dh_srvr=s->s3->tmp.dh;
1437                         }
1438
1439                 pub=BN_bin2bn(p,i,NULL);
1440                 if (pub == NULL)
1441                         {
1442                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1443                         goto err;
1444                         }
1445
1446                 i=DH_compute_key(p,pub,dh_srvr);
1447
1448                 if (i <= 0)
1449                         {
1450                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1451                         goto err;
1452                         }
1453
1454                 DH_free(s->s3->tmp.dh);
1455                 s->s3->tmp.dh=NULL;
1456
1457                 BN_clear_free(pub);
1458                 pub=NULL;
1459                 s->session->master_key_length=
1460                         s->method->ssl3_enc->generate_master_secret(s,
1461                                 s->session->master_key,p,i);
1462                 memset(p,0,i);
1463                 }
1464         else
1465 #endif
1466 #ifndef OPENSSL_NO_KRB5
1467         if (l & SSL_kKRB5)
1468                 {
1469                 krb5_error_code         krb5rc;
1470                 krb5_data               enc_ticket;
1471                 krb5_data               authenticator;
1472                 krb5_data               enc_pms;
1473                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1474                 EVP_CIPHER_CTX          ciph_ctx;
1475                 EVP_CIPHER              *enc = NULL;
1476                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1477                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1478                                                 + EVP_MAX_IV_LENGTH + 1];
1479                 int                     padl, outl = sizeof(pms);
1480                 krb5_timestamp          authtime = 0;
1481                 krb5_ticket_times       ttimes;
1482
1483                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1484
1485                 n2s(p,i);
1486                 enc_ticket.length = i;
1487                 enc_ticket.data = p;
1488                 p+=enc_ticket.length;
1489
1490                 n2s(p,i);
1491                 authenticator.length = i;
1492                 authenticator.data = p;
1493                 p+=authenticator.length;
1494
1495                 n2s(p,i);
1496                 enc_pms.length = i;
1497                 enc_pms.data = p;
1498                 p+=enc_pms.length;
1499
1500                 if ((unsigned long)n != enc_ticket.length + authenticator.length +
1501                                                 enc_pms.length + 6)
1502                         {
1503                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1504                                 SSL_R_DATA_LENGTH_TOO_LONG);
1505                         goto err;
1506                         }
1507
1508                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1509                                         &kssl_err)) != 0)
1510                         {
1511 #ifdef KSSL_DEBUG
1512                         printf("kssl_sget_tkt rtn %d [%d]\n",
1513                                 krb5rc, kssl_err.reason);
1514                         if (kssl_err.text)
1515                                 printf("kssl_err text= %s\n", kssl_err.text);
1516 #endif  /* KSSL_DEBUG */
1517                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1518                                 kssl_err.reason);
1519                         goto err;
1520                         }
1521
1522                 /*  Note: no authenticator is not considered an error,
1523                 **  but will return authtime == 0.
1524                 */
1525                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1526                                         &authtime, &kssl_err)) != 0)
1527                         {
1528 #ifdef KSSL_DEBUG
1529                         printf("kssl_check_authent rtn %d [%d]\n",
1530                                 krb5rc, kssl_err.reason);
1531                         if (kssl_err.text)
1532                                 printf("kssl_err text= %s\n", kssl_err.text);
1533 #endif  /* KSSL_DEBUG */
1534                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1535                                 kssl_err.reason);
1536                         goto err;
1537                         }
1538
1539                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1540                         {
1541                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, krb5rc);
1542                         goto err;
1543                         }
1544
1545 #ifdef KSSL_DEBUG
1546                 kssl_ctx_show(kssl_ctx);
1547 #endif  /* KSSL_DEBUG */
1548
1549                 enc = kssl_map_enc(kssl_ctx->enctype);
1550                 if (enc == NULL)
1551                     goto err;
1552
1553                 memset(iv, 0, EVP_MAX_IV_LENGTH);       /* per RFC 1510 */
1554
1555                 if (!EVP_DecryptInit(&ciph_ctx,enc,kssl_ctx->key,iv))
1556                         {
1557                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1558                                 SSL_R_DECRYPTION_FAILED);
1559                         goto err;
1560                         }
1561                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1562                                         enc_pms.data, enc_pms.length))
1563                         {
1564                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1565                                 SSL_R_DECRYPTION_FAILED);
1566                         goto err;
1567                         }
1568                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1569                         {
1570                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1571                                 SSL_R_DATA_LENGTH_TOO_LONG);
1572                         goto err;
1573                         }
1574                 if (!EVP_DecryptFinal(&ciph_ctx,&(pms[outl]),&padl))
1575                         {
1576                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1577                                 SSL_R_DECRYPTION_FAILED);
1578                         goto err;
1579                         }
1580                 outl += padl;
1581                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1582                         {
1583                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1584                                 SSL_R_DATA_LENGTH_TOO_LONG);
1585                         goto err;
1586                         }
1587                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1588
1589                 s->session->master_key_length=
1590                         s->method->ssl3_enc->generate_master_secret(s,
1591                                 s->session->master_key, pms, outl);
1592
1593                 if (kssl_ctx->client_princ)
1594                         {
1595                         int len = strlen(kssl_ctx->client_princ);
1596                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
1597                                 {
1598                                 s->session->krb5_client_princ_len = len;
1599                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
1600                                 }
1601                         }
1602
1603
1604                 /*  Was doing kssl_ctx_free() here,
1605                 **  but it caused problems for apache.
1606                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
1607                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
1608                 */
1609                 }
1610         else
1611 #endif  /* OPENSSL_NO_KRB5 */
1612                 {
1613                 al=SSL_AD_HANDSHAKE_FAILURE;
1614                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1615                                 SSL_R_UNKNOWN_CIPHER_TYPE);
1616                 goto f_err;
1617                 }
1618
1619         return(1);
1620 f_err:
1621         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1622 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA)
1623 err:
1624 #endif
1625         return(-1);
1626         }
1627
1628 static int ssl3_get_cert_verify(SSL *s)
1629         {
1630         EVP_PKEY *pkey=NULL;
1631         unsigned char *p;
1632         int al,ok,ret=0;
1633         long n;
1634         int type=0,i,j;
1635         X509 *peer;
1636
1637         n=ssl3_get_message(s,
1638                 SSL3_ST_SR_CERT_VRFY_A,
1639                 SSL3_ST_SR_CERT_VRFY_B,
1640                 -1,
1641                 512, /* 512? */
1642                 &ok);
1643
1644         if (!ok) return((int)n);
1645
1646         if (s->session->peer != NULL)
1647                 {
1648                 peer=s->session->peer;
1649                 pkey=X509_get_pubkey(peer);
1650                 type=X509_certificate_type(peer,pkey);
1651                 }
1652         else
1653                 {
1654                 peer=NULL;
1655                 pkey=NULL;
1656                 }
1657
1658         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1659                 {
1660                 s->s3->tmp.reuse_message=1;
1661                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1662                         {
1663                         al=SSL_AD_UNEXPECTED_MESSAGE;
1664                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1665                         goto f_err;
1666                         }
1667                 ret=1;
1668                 goto end;
1669                 }
1670
1671         if (peer == NULL)
1672                 {
1673                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1674                 al=SSL_AD_UNEXPECTED_MESSAGE;
1675                 goto f_err;
1676                 }
1677
1678         if (!(type & EVP_PKT_SIGN))
1679                 {
1680                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1681                 al=SSL_AD_ILLEGAL_PARAMETER;
1682                 goto f_err;
1683                 }
1684
1685         if (s->s3->change_cipher_spec)
1686                 {
1687                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1688                 al=SSL_AD_UNEXPECTED_MESSAGE;
1689                 goto f_err;
1690                 }
1691
1692         /* we now have a signature that we need to verify */
1693         p=(unsigned char *)s->init_buf->data;
1694         n2s(p,i);
1695         n-=2;
1696         if (i > n)
1697                 {
1698                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1699                 al=SSL_AD_DECODE_ERROR;
1700                 goto f_err;
1701                 }
1702
1703         j=EVP_PKEY_size(pkey);
1704         if ((i > j) || (n > j) || (n <= 0))
1705                 {
1706                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1707                 al=SSL_AD_DECODE_ERROR;
1708                 goto f_err;
1709                 }
1710
1711 #ifndef OPENSSL_NO_RSA
1712         if (pkey->type == EVP_PKEY_RSA)
1713                 {
1714                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1715                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1716                                                         pkey->pkey.rsa);
1717                 if (i < 0)
1718                         {
1719                         al=SSL_AD_DECRYPT_ERROR;
1720                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1721                         goto f_err;
1722                         }
1723                 if (i == 0)
1724                         {
1725                         al=SSL_AD_DECRYPT_ERROR;
1726                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1727                         goto f_err;
1728                         }
1729                 }
1730         else
1731 #endif
1732 #ifndef OPENSSL_NO_DSA
1733                 if (pkey->type == EVP_PKEY_DSA)
1734                 {
1735                 j=DSA_verify(pkey->save_type,
1736                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1737                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1738                 if (j <= 0)
1739                         {
1740                         /* bad signature */
1741                         al=SSL_AD_DECRYPT_ERROR;
1742                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1743                         goto f_err;
1744                         }
1745                 }
1746         else
1747 #endif
1748                 {
1749                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
1750                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1751                 goto f_err;
1752                 }
1753
1754
1755         ret=1;
1756         if (0)
1757                 {
1758 f_err:
1759                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1760                 }
1761 end:
1762         EVP_PKEY_free(pkey);
1763         return(ret);
1764         }
1765
1766 static int ssl3_get_client_certificate(SSL *s)
1767         {
1768         int i,ok,al,ret= -1;
1769         X509 *x=NULL;
1770         unsigned long l,nc,llen,n;
1771         unsigned char *p,*d,*q;
1772         STACK_OF(X509) *sk=NULL;
1773
1774         n=ssl3_get_message(s,
1775                 SSL3_ST_SR_CERT_A,
1776                 SSL3_ST_SR_CERT_B,
1777                 -1,
1778 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN32)
1779                 1024*30, /* 30k max cert list :-) */
1780 #else
1781                 1024*100, /* 100k max cert list :-) */
1782 #endif
1783                 &ok);
1784
1785         if (!ok) return((int)n);
1786
1787         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1788                 {
1789                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1790                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1791                         {
1792                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1793                         al=SSL_AD_HANDSHAKE_FAILURE;
1794                         goto f_err;
1795                         }
1796                 /* If tls asked for a client cert, the client must return a 0 list */
1797                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1798                         {
1799                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1800                         al=SSL_AD_UNEXPECTED_MESSAGE;
1801                         goto f_err;
1802                         }
1803                 s->s3->tmp.reuse_message=1;
1804                 return(1);
1805                 }
1806
1807         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1808                 {
1809                 al=SSL_AD_UNEXPECTED_MESSAGE;
1810                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1811                 goto f_err;
1812                 }
1813         d=p=(unsigned char *)s->init_buf->data;
1814
1815         if ((sk=sk_X509_new_null()) == NULL)
1816                 {
1817                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1818                 goto err;
1819                 }
1820
1821         n2l3(p,llen);
1822         if (llen+3 != n)
1823                 {
1824                 al=SSL_AD_DECODE_ERROR;
1825                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1826                 goto f_err;
1827                 }
1828         for (nc=0; nc<llen; )
1829                 {
1830                 n2l3(p,l);
1831                 if ((l+nc+3) > llen)
1832                         {
1833                         al=SSL_AD_DECODE_ERROR;
1834                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1835                         goto f_err;
1836                         }
1837
1838                 q=p;
1839                 x=d2i_X509(NULL,&p,l);
1840                 if (x == NULL)
1841                         {
1842                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1843                         goto err;
1844                         }
1845                 if (p != (q+l))
1846                         {
1847                         al=SSL_AD_DECODE_ERROR;
1848                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1849                         goto f_err;
1850                         }
1851                 if (!sk_X509_push(sk,x))
1852                         {
1853                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1854                         goto err;
1855                         }
1856                 x=NULL;
1857                 nc+=l+3;
1858                 }
1859
1860         if (sk_X509_num(sk) <= 0)
1861                 {
1862                 /* TLS does not mind 0 certs returned */
1863                 if (s->version == SSL3_VERSION)
1864                         {
1865                         al=SSL_AD_HANDSHAKE_FAILURE;
1866                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1867                         goto f_err;
1868                         }
1869                 /* Fail for TLS only if we required a certificate */
1870                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1871                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1872                         {
1873                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1874                         al=SSL_AD_HANDSHAKE_FAILURE;
1875                         goto f_err;
1876                         }
1877                 }
1878         else
1879                 {
1880                 i=ssl_verify_cert_chain(s,sk);
1881                 if (!i)
1882                         {
1883                         al=ssl_verify_alarm_type(s->verify_result);
1884                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1885                         goto f_err;
1886                         }
1887                 }
1888
1889         if (s->session->peer != NULL) /* This should not be needed */
1890                 X509_free(s->session->peer);
1891         s->session->peer=sk_X509_shift(sk);
1892         s->session->verify_result = s->verify_result;
1893
1894         /* With the current implementation, sess_cert will always be NULL
1895          * when we arrive here. */
1896         if (s->session->sess_cert == NULL)
1897                 {
1898                 s->session->sess_cert = ssl_sess_cert_new();
1899                 if (s->session->sess_cert == NULL)
1900                         {
1901                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1902                         goto err;
1903                         }
1904                 }
1905         if (s->session->sess_cert->cert_chain != NULL)
1906                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1907         s->session->sess_cert->cert_chain=sk;
1908         /* Inconsistency alert: cert_chain does *not* include the
1909          * peer's own certificate, while we do include it in s3_clnt.c */
1910
1911         sk=NULL;
1912
1913         ret=1;
1914         if (0)
1915                 {
1916 f_err:
1917                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1918                 }
1919 err:
1920         if (x != NULL) X509_free(x);
1921         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1922         return(ret);
1923         }
1924
1925 int ssl3_send_server_certificate(SSL *s)
1926         {
1927         unsigned long l;
1928         X509 *x;
1929
1930         if (s->state == SSL3_ST_SW_CERT_A)
1931                 {
1932                 x=ssl_get_server_send_cert(s);
1933                 if (x == NULL &&
1934                         /* VRS: allow null cert if auth == KRB5 */
1935                         (s->s3->tmp.new_cipher->algorithms
1936                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1937                         != (SSL_aKRB5|SSL_kKRB5))
1938                         {
1939                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1940                         return(0);
1941                         }
1942
1943                 l=ssl3_output_cert_chain(s,x);
1944                 s->state=SSL3_ST_SW_CERT_B;
1945                 s->init_num=(int)l;
1946                 s->init_off=0;
1947                 }
1948
1949         /* SSL3_ST_SW_CERT_B */
1950         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1951         }