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  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #define REUSE_CIPHER_BUG
 113 #define NETSCAPE_HANG_BUG
 114
 115
 116 #include <stdio.h>
 117 #include <openssl/buffer.h>
 118 #include <openssl/rand.h>
 119 #include <openssl/objects.h>
 120 #include <openssl/md5.h>
 121 #include <openssl/sha.h>
 122 #include <openssl/evp.h>
 123 #include <openssl/x509.h>
 124 #include "ssl_locl.h"
 125 #include "cryptlib.h"
 126
 127 static SSL_METHOD *ssl3_get_server_method(int ver);
 128 static int ssl3_get_client_hello(SSL *s);
 129 static int ssl3_check_client_hello(SSL *s);
 130 static int ssl3_send_server_hello(SSL *s);
 131 static int ssl3_send_server_key_exchange(SSL *s);
 132 static int ssl3_send_certificate_request(SSL *s);
 133 static int ssl3_send_server_done(SSL *s);
 134 static int ssl3_get_client_key_exchange(SSL *s);
 135 static int ssl3_get_client_certificate(SSL *s);
 136 static int ssl3_get_cert_verify(SSL *s);
 137 static int ssl3_send_hello_request(SSL *s);
 138
 139 static SSL_METHOD *ssl3_get_server_method(int ver)
 140         {
 141         if (ver == SSL3_VERSION)
 142                 return(SSLv3_server_method());
 143         else
 144                 return(NULL);
 145         }
 146
 147 SSL_METHOD *SSLv3_server_method(void)
 148         {
 149         static int init=1;
 150         static SSL_METHOD SSLv3_server_data;
 151
 152         if (init)
 153                 {
 154                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 155                         sizeof(SSL_METHOD));
 156                 SSLv3_server_data.ssl_accept=ssl3_accept;
 157                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 158                 init=0;
 159                 }
 160         return(&SSLv3_server_data);
 161         }
 162
 163 int ssl3_accept(SSL *s)
 164         {
 165         BUF_MEM *buf;
 166         unsigned long l,Time=time(NULL);
 167         void (*cb)()=NULL;
 168         long num1;
 169         int ret= -1;
 170         int new_state,state,skip=0;
 171
 172         RAND_add(&Time,sizeof(Time),0);
 173         ERR_clear_error();
 174         clear_sys_error();
 175
 176         if (s->info_callback != NULL)
 177                 cb=s->info_callback;
 178         else if (s->ctx->info_callback != NULL)
 179                 cb=s->ctx->info_callback;
 180
 181         /* init things to blank */
 182         s->in_handshake++;
 183         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 184
 185         if (s->cert == NULL)
 186                 {
 187                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 188                 return(-1);
 189                 }
 190
 191         for (;;)
 192                 {
 193                 state=s->state;
 194
 195                 switch (s->state)
 196                         {
 197                 case SSL_ST_RENEGOTIATE:
 198                         s->new_session=1;
 199                         /* s->state=SSL_ST_ACCEPT; */
 200
 201                 case SSL_ST_BEFORE:
 202                 case SSL_ST_ACCEPT:
 203                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 204                 case SSL_ST_OK|SSL_ST_ACCEPT:
 205
 206                         s->server=1;
 207                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 208
 209                         if ((s->version>>8) != 3)
 210                                 {
 211                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_INTERNAL_ERROR);
 212                                 return -1;
 213                                 }
 214                         s->type=SSL_ST_ACCEPT;
 215
 216                         if (s->init_buf == NULL)
 217                                 {
 218                                 if ((buf=BUF_MEM_new()) == NULL)
 219                                         {
 220                                         ret= -1;
 221                                         goto end;
 222                                         }
 223                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 224                                         {
 225                                         ret= -1;
 226                                         goto end;
 227                                         }
 228                                 s->init_buf=buf;
 229                                 }
 230
 231                         if (!ssl3_setup_buffers(s))
 232                                 {
 233                                 ret= -1;
 234                                 goto end;
 235                                 }
 236
 237                         s->init_num=0;
 238
 239                         if (s->state != SSL_ST_RENEGOTIATE)
 240                                 {
 241                                 /* Ok, we now need to push on a buffering BIO so that
 242                                  * the output is sent in a way that TCP likes :-)
 243                                  */
 244                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 245
 246                                 ssl3_init_finished_mac(s);
 247                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 248                                 s->ctx->stats.sess_accept++;
 249                                 }
 250                         else
 251                                 {
 252                                 /* s->state == SSL_ST_RENEGOTIATE,
 253                                  * we will just send a HelloRequest */
 254                                 s->ctx->stats.sess_accept_renegotiate++;
 255                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 256                                 }
 257                         break;
 258
 259                 case SSL3_ST_SW_HELLO_REQ_A:
 260                 case SSL3_ST_SW_HELLO_REQ_B:
 261
 262                         s->shutdown=0;
 263                         ret=ssl3_send_hello_request(s);
 264                         if (ret <= 0) goto end;
 265                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 266                         s->state=SSL3_ST_SW_FLUSH;
 267                         s->init_num=0;
 268
 269                         ssl3_init_finished_mac(s);
 270                         break;
 271
 272                 case SSL3_ST_SW_HELLO_REQ_C:
 273                         s->state=SSL_ST_OK;
 274                         break;
 275
 276                 case SSL3_ST_SR_CLNT_HELLO_A:
 277                 case SSL3_ST_SR_CLNT_HELLO_B:
 278                 case SSL3_ST_SR_CLNT_HELLO_C:
 279
 280                         s->shutdown=0;
 281                         ret=ssl3_get_client_hello(s);
 282                         if (ret <= 0) goto end;
 283                         s->new_session = 2;
 284                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 285                         s->init_num=0;
 286                         break;
 287
 288                 case SSL3_ST_SW_SRVR_HELLO_A:
 289                 case SSL3_ST_SW_SRVR_HELLO_B:
 290                         ret=ssl3_send_server_hello(s);
 291                         if (ret <= 0) goto end;
 292
 293                         if (s->hit)
 294                                 s->state=SSL3_ST_SW_CHANGE_A;
 295                         else
 296                                 s->state=SSL3_ST_SW_CERT_A;
 297                         s->init_num=0;
 298                         break;
 299
 300                 case SSL3_ST_SW_CERT_A:
 301                 case SSL3_ST_SW_CERT_B:
 302                         /* Check if it is anon DH */
 303                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 304                                 {
 305                                 ret=ssl3_send_server_certificate(s);
 306                                 if (ret <= 0) goto end;
 307                                 }
 308                         else
 309                                 skip=1;
 310                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 311                         s->init_num=0;
 312                         break;
 313
 314                 case SSL3_ST_SW_KEY_EXCH_A:
 315                 case SSL3_ST_SW_KEY_EXCH_B:
 316                         l=s->s3->tmp.new_cipher->algorithms;
 317
 318                         /* clear this, it may get reset by
 319                          * send_server_key_exchange */
 320                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 321                                 s->s3->tmp.use_rsa_tmp=1;
 322                         else
 323                                 s->s3->tmp.use_rsa_tmp=0;
 324
 325                         /* only send if a DH key exchange, fortezza or
 326                          * RSA but we have a sign only certificate */
 327                         if (s->s3->tmp.use_rsa_tmp
 328                             || (l & (SSL_DH|SSL_kFZA))
 329                             || ((l & SSL_kRSA)
 330                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 331                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 332                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 333                                         )
 334                                     )
 335                                 )
 336                             )
 337                                 {
 338                                 ret=ssl3_send_server_key_exchange(s);
 339                                 if (ret <= 0) goto end;
 340                                 }
 341                         else
 342                                 skip=1;
 343
 344                         s->state=SSL3_ST_SW_CERT_REQ_A;
 345                         s->init_num=0;
 346                         break;
 347
 348                 case SSL3_ST_SW_CERT_REQ_A:
 349                 case SSL3_ST_SW_CERT_REQ_B:
 350                         if (/* don't request cert unless asked for it: */
 351                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 352                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 353                                  * don't request cert during re-negotiation: */
 354                                 ((s->session->peer != NULL) &&
 355                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 356                                 /* never request cert in anonymous ciphersuites
 357                                  * (see section "Certificate request" in SSL 3 drafts
 358                                  * and in RFC 2246): */
 359                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 360                                  /* ... except when the application insists on verification
 361                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 362                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
 363                                 {
 364                                 /* no cert request */
 365                                 skip=1;
 366                                 s->s3->tmp.cert_request=0;
 367                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 368                                 }
 369                         else
 370                                 {
 371                                 s->s3->tmp.cert_request=1;
 372                                 ret=ssl3_send_certificate_request(s);
 373                                 if (ret <= 0) goto end;
 374 #ifndef NETSCAPE_HANG_BUG
 375                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 376 #else
 377                                 s->state=SSL3_ST_SW_FLUSH;
 378                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 379 #endif
 380                                 s->init_num=0;
 381                                 }
 382                         break;
 383
 384                 case SSL3_ST_SW_SRVR_DONE_A:
 385                 case SSL3_ST_SW_SRVR_DONE_B:
 386                         ret=ssl3_send_server_done(s);
 387                         if (ret <= 0) goto end;
 388                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 389                         s->state=SSL3_ST_SW_FLUSH;
 390                         s->init_num=0;
 391                         break;
 392
 393                 case SSL3_ST_SW_FLUSH:
 394                         /* number of bytes to be flushed */
 395                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 396                         if (num1 > 0)
 397                                 {
 398                                 s->rwstate=SSL_WRITING;
 399                                 num1=BIO_flush(s->wbio);
 400                                 if (num1 <= 0) { ret= -1; goto end; }
 401                                 s->rwstate=SSL_NOTHING;
 402                                 }
 403
 404                         s->state=s->s3->tmp.next_state;
 405                         break;
 406
 407                 case SSL3_ST_SR_CERT_A:
 408                 case SSL3_ST_SR_CERT_B:
 409                         /* Check for second client hello (MS SGC) */
 410                         ret = ssl3_check_client_hello(s);
 411                         if (ret <= 0)
 412                                 goto end;
 413                         if (ret == 2)
 414                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 415                         else {
 416                                 /* could be sent for a DH cert, even if we
 417                                  * have not asked for it :-) */
 418                                 ret=ssl3_get_client_certificate(s);
 419                                 if (ret <= 0) goto end;
 420                                 s->init_num=0;
 421                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 422                         }
 423                         break;
 424
 425                 case SSL3_ST_SR_KEY_EXCH_A:
 426                 case SSL3_ST_SR_KEY_EXCH_B:
 427                         ret=ssl3_get_client_key_exchange(s);
 428                         if (ret <= 0) goto end;
 429                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 430                         s->init_num=0;
 431
 432                         /* We need to get hashes here so if there is
 433                          * a client cert, it can be verified */
 434                         s->method->ssl3_enc->cert_verify_mac(s,
 435                                 &(s->s3->finish_dgst1),
 436                                 &(s->s3->tmp.cert_verify_md[0]));
 437                         s->method->ssl3_enc->cert_verify_mac(s,
 438                                 &(s->s3->finish_dgst2),
 439                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 440
 441                         break;
 442
 443                 case SSL3_ST_SR_CERT_VRFY_A:
 444                 case SSL3_ST_SR_CERT_VRFY_B:
 445
 446                         /* we should decide if we expected this one */
 447                         ret=ssl3_get_cert_verify(s);
 448                         if (ret <= 0) goto end;
 449
 450                         s->state=SSL3_ST_SR_FINISHED_A;
 451                         s->init_num=0;
 452                         break;
 453
 454                 case SSL3_ST_SR_FINISHED_A:
 455                 case SSL3_ST_SR_FINISHED_B:
 456                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 457                                 SSL3_ST_SR_FINISHED_B);
 458                         if (ret <= 0) goto end;
 459                         if (s->hit)
 460                                 s->state=SSL_ST_OK;
 461                         else
 462                                 s->state=SSL3_ST_SW_CHANGE_A;
 463                         s->init_num=0;
 464                         break;
 465
 466                 case SSL3_ST_SW_CHANGE_A:
 467                 case SSL3_ST_SW_CHANGE_B:
 468
 469                         s->session->cipher=s->s3->tmp.new_cipher;
 470                         if (!s->method->ssl3_enc->setup_key_block(s))
 471                                 { ret= -1; goto end; }
 472
 473                         ret=ssl3_send_change_cipher_spec(s,
 474                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 475
 476                         if (ret <= 0) goto end;
 477                         s->state=SSL3_ST_SW_FINISHED_A;
 478                         s->init_num=0;
 479
 480                         if (!s->method->ssl3_enc->change_cipher_state(s,
 481                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 482                                 {
 483                                 ret= -1;
 484                                 goto end;
 485                                 }
 486
 487                         break;
 488
 489                 case SSL3_ST_SW_FINISHED_A:
 490                 case SSL3_ST_SW_FINISHED_B:
 491                         ret=ssl3_send_finished(s,
 492                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 493                                 s->method->ssl3_enc->server_finished_label,
 494                                 s->method->ssl3_enc->server_finished_label_len);
 495                         if (ret <= 0) goto end;
 496                         s->state=SSL3_ST_SW_FLUSH;
 497                         if (s->hit)
 498                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 499                         else
 500                                 s->s3->tmp.next_state=SSL_ST_OK;
 501                         s->init_num=0;
 502                         break;
 503
 504                 case SSL_ST_OK:
 505                         /* clean a few things up */
 506                         ssl3_cleanup_key_block(s);
 507
 508                         BUF_MEM_free(s->init_buf);
 509                         s->init_buf=NULL;
 510
 511                         /* remove buffering on output */
 512                         ssl_free_wbio_buffer(s);
 513
 514                         s->init_num=0;
 515
 516                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 517                                 {
 518                                 /* actually not necessarily a 'new' session  */
 519
 520                                 s->new_session=0;
 521
 522                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 523
 524                                 s->ctx->stats.sess_accept_good++;
 525                                 /* s->server=1; */
 526                                 s->handshake_func=ssl3_accept;
 527
 528                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 529                                 }
 530
 531                         ret = 1;
 532                         goto end;
 533                         /* break; */
 534
 535                 default:
 536                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 537                         ret= -1;
 538                         goto end;
 539                         /* break; */
 540                         }
 541
 542                 if (!s->s3->tmp.reuse_message && !skip)
 543                         {
 544                         if (s->debug)
 545                                 {
 546                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 547                                         goto end;
 548                                 }
 549
 550
 551                         if ((cb != NULL) && (s->state != state))
 552                                 {
 553                                 new_state=s->state;
 554                                 s->state=state;
 555                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 556                                 s->state=new_state;
 557                                 }
 558                         }
 559                 skip=0;
 560                 }
 561 end:
 562         /* BIO_flush(s->wbio); */
 563
 564         s->in_handshake--;
 565         if (cb != NULL)
 566                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 567         return(ret);
 568         }
 569
 570 static int ssl3_send_hello_request(SSL *s)
 571         {
 572         unsigned char *p;
 573
 574         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 575                 {
 576                 p=(unsigned char *)s->init_buf->data;
 577                 *(p++)=SSL3_MT_HELLO_REQUEST;
 578                 *(p++)=0;
 579                 *(p++)=0;
 580                 *(p++)=0;
 581
 582                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 583                 /* number of bytes to write */
 584                 s->init_num=4;
 585                 s->init_off=0;
 586                 }
 587
 588         /* SSL3_ST_SW_HELLO_REQ_B */
 589         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 590         }
 591
 592 static int ssl3_check_client_hello(SSL *s)
 593         {
 594         int ok;
 595         long n;
 596
 597         /* this function is called when we really expect a Certificate message,
 598          * so permit appropriate message length */
 599         n=ssl3_get_message(s,
 600                 SSL3_ST_SR_CERT_A,
 601                 SSL3_ST_SR_CERT_B,
 602                 -1,
 603 #if defined(MSDOS) && !defined(WIN32)
 604                 1024*30, /* 30k max cert list :-) */
 605 #else
 606                 1024*100, /* 100k max cert list :-) */
 607 #endif
 608                 &ok);
 609         if (!ok) return((int)n);
 610         s->s3->tmp.reuse_message = 1;
 611         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 612                 {
 613                 /* Throw away what we have done so far in the current handshake,
 614                  * which will now be aborted. (A full SSL_clear would be too much.)
 615                  * I hope that tmp.dh is the only thing that may need to be cleared
 616                  * when a handshake is not completed ... */
 617 #ifndef NO_DH
 618                 if (s->s3->tmp.dh != NULL)
 619                         {
 620                         DH_free(s->s3->tmp.dh);
 621                         s->s3->tmp.dh = NULL;
 622                         }
 623 #endif
 624                 return 2;
 625                 }
 626         return 1;
 627 }
 628
 629 static int ssl3_get_client_hello(SSL *s)
 630         {
 631         int i,j,ok,al,ret= -1;
 632         long n;
 633         unsigned long id;
 634         unsigned char *p,*d,*q;
 635         SSL_CIPHER *c;
 636         SSL_COMP *comp=NULL;
 637         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 638
 639         /* We do this so that we will respond with our native type.
 640          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 641          * This down switching should be handled by a different method.
 642          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 643          * TLSv1.
 644          */
 645         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 646                 {
 647                 s->first_packet=1;
 648                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 649                 }
 650         n=ssl3_get_message(s,
 651                 SSL3_ST_SR_CLNT_HELLO_B,
 652                 SSL3_ST_SR_CLNT_HELLO_C,
 653                 SSL3_MT_CLIENT_HELLO,
 654                 SSL3_RT_MAX_PLAIN_LENGTH,
 655                 &ok);
 656
 657         if (!ok) return((int)n);
 658         d=p=(unsigned char *)s->init_buf->data;
 659
 660         /* use version from inside client hello, not from record header
 661          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 662         s->client_version=(((int)p[0])<<8)|(int)p[1];
 663         p+=2;
 664
 665         if (s->client_version < s->version)
 666                 {
 667                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 668                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 669                         {
 670                         /* similar to ssl3_get_record, send alert using remote version number */
 671                         s->version = s->client_version;
 672                         }
 673                 al = SSL_AD_PROTOCOL_VERSION;
 674                 goto f_err;
 675                 }
 676
 677         /* load the client random */
 678         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 679         p+=SSL3_RANDOM_SIZE;
 680
 681         /* get the session-id */
 682         j= *(p++);
 683
 684         s->hit=0;
 685         if (j == 0)
 686                 {
 687                 if (!ssl_get_new_session(s,1))
 688                         goto err;
 689                 }
 690         else
 691                 {
 692                 i=ssl_get_prev_session(s,p,j);
 693                 if (i == 1)
 694                         { /* previous session */
 695                         s->hit=1;
 696                         }
 697                 else if (i == -1)
 698                         goto err;
 699                 else /* i == 0 */
 700                         {
 701                         if (!ssl_get_new_session(s,1))
 702                                 goto err;
 703                         }
 704                 }
 705
 706         p+=j;
 707         n2s(p,i);
 708         if ((i == 0) && (j != 0))
 709                 {
 710                 /* we need a cipher if we are not resuming a session */
 711                 al=SSL_AD_ILLEGAL_PARAMETER;
 712                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 713                 goto f_err;
 714                 }
 715         if ((p+i) >= (d+n))
 716                 {
 717                 /* not enough data */
 718                 al=SSL_AD_DECODE_ERROR;
 719                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 720                 goto f_err;
 721                 }
 722         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 723                 == NULL))
 724                 {
 725                 goto err;
 726                 }
 727         p+=i;
 728
 729         /* If it is a hit, check that the cipher is in the list */
 730         if ((s->hit) && (i > 0))
 731                 {
 732                 j=0;
 733                 id=s->session->cipher->id;
 734
 735 #ifdef CIPHER_DEBUG
 736                 printf("client sent %d ciphers\n",sk_num(ciphers));
 737 #endif
 738                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 739                         {
 740                         c=sk_SSL_CIPHER_value(ciphers,i);
 741 #ifdef CIPHER_DEBUG
 742                         printf("client [%2d of %2d]:%s\n",
 743                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 744 #endif
 745                         if (c->id == id)
 746                                 {
 747                                 j=1;
 748                                 break;
 749                                 }
 750                         }
 751                 if (j == 0)
 752                         {
 753                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 754                                 {
 755                                 /* Very bad for multi-threading.... */
 756                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 757                                                                        0);
 758                                 }
 759                         else
 760                                 {
 761                                 /* we need to have the cipher in the cipher
 762                                  * list if we are asked to reuse it */
 763                                 al=SSL_AD_ILLEGAL_PARAMETER;
 764                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 765                                 goto f_err;
 766                                 }
 767                         }
 768                 }
 769
 770         /* compression */
 771         i= *(p++);
 772         if ((p+i) > (d+n))
 773                 {
 774                 /* not enough data */
 775                 al=SSL_AD_DECODE_ERROR;
 776                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 777                 goto f_err;
 778                 }
 779         q=p;
 780         for (j=0; j<i; j++)
 781                 {
 782                 if (p[j] == 0) break;
 783                 }
 784
 785         p+=i;
 786         if (j >= i)
 787                 {
 788                 /* no compress */
 789                 al=SSL_AD_DECODE_ERROR;
 790                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 791                 goto f_err;
 792                 }
 793
 794         /* Worst case, we will use the NULL compression, but if we have other
 795          * options, we will now look for them.  We have i-1 compression
 796          * algorithms from the client, starting at q. */
 797         s->s3->tmp.new_compression=NULL;
 798         if (s->ctx->comp_methods != NULL)
 799                 { /* See if we have a match */
 800                 int m,nn,o,v,done=0;
 801
 802                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 803                 for (m=0; m<nn; m++)
 804                         {
 805                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 806                         v=comp->id;
 807                         for (o=0; o<i; o++)
 808                                 {
 809                                 if (v == q[o])
 810                                         {
 811                                         done=1;
 812                                         break;
 813                                         }
 814                                 }
 815                         if (done) break;
 816                         }
 817                 if (done)
 818                         s->s3->tmp.new_compression=comp;
 819                 else
 820                         comp=NULL;
 821                 }
 822
 823         /* TLS does not mind if there is extra stuff */
 824         if (s->version == SSL3_VERSION)
 825                 {
 826                 if (p < (d+n))
 827                         {
 828                         /* wrong number of bytes,
 829                          * there could be more to follow */
 830                         al=SSL_AD_DECODE_ERROR;
 831                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 832                         goto f_err;
 833                         }
 834                 }
 835
 836         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 837          * pick a cipher */
 838
 839         if (!s->hit)
 840                 {
 841                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 842                 if (s->session->ciphers != NULL)
 843                         sk_SSL_CIPHER_free(s->session->ciphers);
 844                 s->session->ciphers=ciphers;
 845                 if (ciphers == NULL)
 846                         {
 847                         al=SSL_AD_ILLEGAL_PARAMETER;
 848                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 849                         goto f_err;
 850                         }
 851                 ciphers=NULL;
 852                 c=ssl3_choose_cipher(s,s->session->ciphers,
 853                                      ssl_get_ciphers_by_id(s));
 854
 855                 if (c == NULL)
 856                         {
 857                         al=SSL_AD_HANDSHAKE_FAILURE;
 858                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 859                         goto f_err;
 860                         }
 861                 s->s3->tmp.new_cipher=c;
 862                 }
 863         else
 864                 {
 865                 /* Session-id reuse */
 866 #ifdef REUSE_CIPHER_BUG
 867                 STACK_OF(SSL_CIPHER) *sk;
 868                 SSL_CIPHER *nc=NULL;
 869                 SSL_CIPHER *ec=NULL;
 870
 871                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 872                         {
 873                         sk=s->session->ciphers;
 874                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 875                                 {
 876                                 c=sk_SSL_CIPHER_value(sk,i);
 877                                 if (c->algorithms & SSL_eNULL)
 878                                         nc=c;
 879                                 if (SSL_C_IS_EXPORT(c))
 880                                         ec=c;
 881                                 }
 882                         if (nc != NULL)
 883                                 s->s3->tmp.new_cipher=nc;
 884                         else if (ec != NULL)
 885                                 s->s3->tmp.new_cipher=ec;
 886                         else
 887                                 s->s3->tmp.new_cipher=s->session->cipher;
 888                         }
 889                 else
 890 #endif
 891                 s->s3->tmp.new_cipher=s->session->cipher;
 892                 }
 893
 894         /* we now have the following setup.
 895          * client_random
 896          * cipher_list          - our prefered list of ciphers
 897          * ciphers              - the clients prefered list of ciphers
 898          * compression          - basically ignored right now
 899          * ssl version is set   - sslv3
 900          * s->session           - The ssl session has been setup.
 901          * s->hit               - session reuse flag
 902          * s->tmp.new_cipher    - the new cipher to use.
 903          */
 904
 905         ret=1;
 906         if (0)
 907                 {
 908 f_err:
 909                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 910                 }
 911 err:
 912         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 913         return(ret);
 914         }
 915
 916 static int ssl3_send_server_hello(SSL *s)
 917         {
 918         unsigned char *buf;
 919         unsigned char *p,*d;
 920         int i,sl;
 921         unsigned long l,Time;
 922
 923         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 924                 {
 925                 buf=(unsigned char *)s->init_buf->data;
 926                 p=s->s3->server_random;
 927                 Time=time(NULL);                        /* Time */
 928                 l2n(Time,p);
 929                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 930                 /* Do the message type and length last */
 931                 d=p= &(buf[4]);
 932
 933                 *(p++)=s->version>>8;
 934                 *(p++)=s->version&0xff;
 935
 936                 /* Random stuff */
 937                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 938                 p+=SSL3_RANDOM_SIZE;
 939
 940                 /* now in theory we have 3 options to sending back the
 941                  * session id.  If it is a re-use, we send back the
 942                  * old session-id, if it is a new session, we send
 943                  * back the new session-id or we send back a 0 length
 944                  * session-id if we want it to be single use.
 945                  * Currently I will not implement the '0' length session-id
 946                  * 12-Jan-98 - I'll now support the '0' length stuff.
 947                  */
 948                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 949                         s->session->session_id_length=0;
 950
 951                 sl=s->session->session_id_length;
 952                 die(sl <= sizeof s->session->session_id);
 953                 *(p++)=sl;
 954                 memcpy(p,s->session->session_id,sl);
 955                 p+=sl;
 956
 957                 /* put the cipher */
 958                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 959                 p+=i;
 960
 961                 /* put the compression method */
 962                 if (s->s3->tmp.new_compression == NULL)
 963                         *(p++)=0;
 964                 else
 965                         *(p++)=s->s3->tmp.new_compression->id;
 966
 967                 /* do the header */
 968                 l=(p-d);
 969                 d=buf;
 970                 *(d++)=SSL3_MT_SERVER_HELLO;
 971                 l2n3(l,d);
 972
 973                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 974                 /* number of bytes to write */
 975                 s->init_num=p-buf;
 976                 s->init_off=0;
 977                 }
 978
 979         /* SSL3_ST_CW_CLNT_HELLO_B */
 980         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 981         }
 982
 983 static int ssl3_send_server_done(SSL *s)
 984         {
 985         unsigned char *p;
 986
 987         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 988                 {
 989                 p=(unsigned char *)s->init_buf->data;
 990
 991                 /* do the header */
 992                 *(p++)=SSL3_MT_SERVER_DONE;
 993                 *(p++)=0;
 994                 *(p++)=0;
 995                 *(p++)=0;
 996
 997                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 998                 /* number of bytes to write */
 999                 s->init_num=4;
1000                 s->init_off=0;
1001                 }
1002
1003         /* SSL3_ST_CW_CLNT_HELLO_B */
1004         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1005         }
1006
1007 static int ssl3_send_server_key_exchange(SSL *s)
1008         {
1009 #ifndef NO_RSA
1010         unsigned char *q;
1011         int j,num;
1012         RSA *rsa;
1013         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1014         unsigned int u;
1015 #endif
1016 #ifndef NO_DH
1017         DH *dh=NULL,*dhp;
1018 #endif
1019         EVP_PKEY *pkey;
1020         unsigned char *p,*d;
1021         int al,i;
1022         unsigned long type;
1023         int n;
1024         CERT *cert;
1025         BIGNUM *r[4];
1026         int nr[4],kn;
1027         BUF_MEM *buf;
1028         EVP_MD_CTX md_ctx;
1029
1030         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1031                 {
1032                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1033                 cert=s->cert;
1034
1035                 buf=s->init_buf;
1036
1037                 r[0]=r[1]=r[2]=r[3]=NULL;
1038                 n=0;
1039 #ifndef NO_RSA
1040                 if (type & SSL_kRSA)
1041                         {
1042                         rsa=cert->rsa_tmp;
1043                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1044                                 {
1045                                 rsa=s->cert->rsa_tmp_cb(s,
1046                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1047                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1048                                 if(rsa == NULL)
1049                                 {
1050                                         al=SSL_AD_HANDSHAKE_FAILURE;
1051                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1052                                         goto f_err;
1053                                 }
1054                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
1055                                 cert->rsa_tmp=rsa;
1056                                 }
1057                         if (rsa == NULL)
1058                                 {
1059                                 al=SSL_AD_HANDSHAKE_FAILURE;
1060                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1061                                 goto f_err;
1062                                 }
1063                         r[0]=rsa->n;
1064                         r[1]=rsa->e;
1065                         s->s3->tmp.use_rsa_tmp=1;
1066                         }
1067                 else
1068 #endif
1069 #ifndef NO_DH
1070                         if (type & SSL_kEDH)
1071                         {
1072                         dhp=cert->dh_tmp;
1073                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1074                                 dhp=s->cert->dh_tmp_cb(s,
1075                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1076                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1077                         if (dhp == NULL)
1078                                 {
1079                                 al=SSL_AD_HANDSHAKE_FAILURE;
1080                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1081                                 goto f_err;
1082                                 }
1083
1084                         if (s->s3->tmp.dh != NULL)
1085                                 {
1086                                 DH_free(dh);
1087                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, SSL_R_INTERNAL_ERROR);
1088                                 goto err;
1089                                 }
1090
1091                         if ((dh=DHparams_dup(dhp)) == NULL)
1092                                 {
1093                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1094                                 goto err;
1095                                 }
1096
1097                         s->s3->tmp.dh=dh;
1098                         if ((dhp->pub_key == NULL ||
1099                              dhp->priv_key == NULL ||
1100                              (s->options & SSL_OP_SINGLE_DH_USE)))
1101                                 {
1102                                 if(!DH_generate_key(dh))
1103                                     {
1104                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1105                                            ERR_R_DH_LIB);
1106                                     goto err;
1107                                     }
1108                                 }
1109                         else
1110                                 {
1111                                 dh->pub_key=BN_dup(dhp->pub_key);
1112                                 dh->priv_key=BN_dup(dhp->priv_key);
1113                                 if ((dh->pub_key == NULL) ||
1114                                         (dh->priv_key == NULL))
1115                                         {
1116                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1117                                         goto err;
1118                                         }
1119                                 }
1120                         r[0]=dh->p;
1121                         r[1]=dh->g;
1122                         r[2]=dh->pub_key;
1123                         }
1124                 else
1125 #endif
1126                         {
1127                         al=SSL_AD_HANDSHAKE_FAILURE;
1128                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1129                         goto f_err;
1130                         }
1131                 for (i=0; r[i] != NULL; i++)
1132                         {
1133                         nr[i]=BN_num_bytes(r[i]);
1134                         n+=2+nr[i];
1135                         }
1136
1137                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1138                         {
1139                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1140                                 == NULL)
1141                                 {
1142                                 al=SSL_AD_DECODE_ERROR;
1143                                 goto f_err;
1144                                 }
1145                         kn=EVP_PKEY_size(pkey);
1146                         }
1147                 else
1148                         {
1149                         pkey=NULL;
1150                         kn=0;
1151                         }
1152
1153                 if (!BUF_MEM_grow(buf,n+4+kn))
1154                         {
1155                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1156                         goto err;
1157                         }
1158                 d=(unsigned char *)s->init_buf->data;
1159                 p= &(d[4]);
1160
1161                 for (i=0; r[i] != NULL; i++)
1162                         {
1163                         s2n(nr[i],p);
1164                         BN_bn2bin(r[i],p);
1165                         p+=nr[i];
1166                         }
1167
1168                 /* not anonymous */
1169                 if (pkey != NULL)
1170                         {
1171                         /* n is the length of the params, they start at &(d[4])
1172                          * and p points to the space at the end. */
1173 #ifndef NO_RSA
1174                         if (pkey->type == EVP_PKEY_RSA)
1175                                 {
1176                                 q=md_buf;
1177                                 j=0;
1178                                 for (num=2; num > 0; num--)
1179                                         {
1180                                         EVP_DigestInit(&md_ctx,(num == 2)
1181                                                 ?s->ctx->md5:s->ctx->sha1);
1182                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1183                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1184                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1185                                         EVP_DigestFinal(&md_ctx,q,
1186                                                 (unsigned int *)&i);
1187                                         q+=i;
1188                                         j+=i;
1189                                         }
1190                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1191                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1192                                         {
1193                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1194                                         goto err;
1195                                         }
1196                                 s2n(u,p);
1197                                 n+=u+2;
1198                                 }
1199                         else
1200 #endif
1201 #if !defined(NO_DSA)
1202                                 if (pkey->type == EVP_PKEY_DSA)
1203                                 {
1204                                 /* lets do DSS */
1205                                 EVP_SignInit(&md_ctx,EVP_dss1());
1206                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1207                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1208                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1209                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1210                                         (unsigned int *)&i,pkey))
1211                                         {
1212                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1213                                         goto err;
1214                                         }
1215                                 s2n(i,p);
1216                                 n+=i+2;
1217                                 }
1218                         else
1219 #endif
1220                                 {
1221                                 /* Is this error check actually needed? */
1222                                 al=SSL_AD_HANDSHAKE_FAILURE;
1223                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1224                                 goto f_err;
1225                                 }
1226                         }
1227
1228                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1229                 l2n3(n,d);
1230
1231                 /* we should now have things packed up, so lets send
1232                  * it off */
1233                 s->init_num=n+4;
1234                 s->init_off=0;
1235                 }
1236
1237         s->state = SSL3_ST_SW_KEY_EXCH_B;
1238         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1239 f_err:
1240         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1241 err:
1242         return(-1);
1243         }
1244
1245 static int ssl3_send_certificate_request(SSL *s)
1246         {
1247         unsigned char *p,*d;
1248         int i,j,nl,off,n;
1249         STACK_OF(X509_NAME) *sk=NULL;
1250         X509_NAME *name;
1251         BUF_MEM *buf;
1252
1253         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1254                 {
1255                 buf=s->init_buf;
1256
1257                 d=p=(unsigned char *)&(buf->data[4]);
1258
1259                 /* get the list of acceptable cert types */
1260                 p++;
1261                 n=ssl3_get_req_cert_type(s,p);
1262                 d[0]=n;
1263                 p+=n;
1264                 n++;
1265
1266                 off=n;
1267                 p+=2;
1268                 n+=2;
1269
1270                 sk=SSL_get_client_CA_list(s);
1271                 nl=0;
1272                 if (sk != NULL)
1273                         {
1274                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1275                                 {
1276                                 name=sk_X509_NAME_value(sk,i);
1277                                 j=i2d_X509_NAME(name,NULL);
1278                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1279                                         {
1280                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1281                                         goto err;
1282                                         }
1283                                 p=(unsigned char *)&(buf->data[4+n]);
1284                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1285                                         {
1286                                         s2n(j,p);
1287                                         i2d_X509_NAME(name,&p);
1288                                         n+=2+j;
1289                                         nl+=2+j;
1290                                         }
1291                                 else
1292                                         {
1293                                         d=p;
1294                                         i2d_X509_NAME(name,&p);
1295                                         j-=2; s2n(j,d); j+=2;
1296                                         n+=j;
1297                                         nl+=j;
1298                                         }
1299                                 }
1300                         }
1301                 /* else no CA names */
1302                 p=(unsigned char *)&(buf->data[4+off]);
1303                 s2n(nl,p);
1304
1305                 d=(unsigned char *)buf->data;
1306                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1307                 l2n3(n,d);
1308
1309                 /* we should now have things packed up, so lets send
1310                  * it off */
1311
1312                 s->init_num=n+4;
1313                 s->init_off=0;
1314 #ifdef NETSCAPE_HANG_BUG
1315                 p=(unsigned char *)s->init_buf->data + s->init_num;
1316
1317                 /* do the header */
1318                 *(p++)=SSL3_MT_SERVER_DONE;
1319                 *(p++)=0;
1320                 *(p++)=0;
1321                 *(p++)=0;
1322                 s->init_num += 4;
1323 #endif
1324
1325                 }
1326
1327         /* SSL3_ST_SW_CERT_REQ_B */
1328         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1329 err:
1330         return(-1);
1331         }
1332
1333 static int ssl3_get_client_key_exchange(SSL *s)
1334         {
1335         int i,al,ok;
1336         long n;
1337         unsigned long l;
1338         unsigned char *p;
1339 #ifndef NO_RSA
1340         RSA *rsa=NULL;
1341         EVP_PKEY *pkey=NULL;
1342 #endif
1343 #ifndef NO_DH
1344         BIGNUM *pub=NULL;
1345         DH *dh_srvr;
1346 #endif
1347
1348         n=ssl3_get_message(s,
1349                 SSL3_ST_SR_KEY_EXCH_A,
1350                 SSL3_ST_SR_KEY_EXCH_B,
1351                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1352                 2048, /* ???? */
1353                 &ok);
1354
1355         if (!ok) return((int)n);
1356         p=(unsigned char *)s->init_buf->data;
1357
1358         l=s->s3->tmp.new_cipher->algorithms;
1359
1360 #ifndef NO_RSA
1361         if (l & SSL_kRSA)
1362                 {
1363                 /* FIX THIS UP EAY EAY EAY EAY */
1364                 if (s->s3->tmp.use_rsa_tmp)
1365                         {
1366                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1367                                 rsa=s->cert->rsa_tmp;
1368                         /* Don't do a callback because rsa_tmp should
1369                          * be sent already */
1370                         if (rsa == NULL)
1371                                 {
1372                                 al=SSL_AD_HANDSHAKE_FAILURE;
1373                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1374                                 goto f_err;
1375
1376                                 }
1377                         }
1378                 else
1379                         {
1380                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1381                         if (    (pkey == NULL) ||
1382                                 (pkey->type != EVP_PKEY_RSA) ||
1383                                 (pkey->pkey.rsa == NULL))
1384                                 {
1385                                 al=SSL_AD_HANDSHAKE_FAILURE;
1386                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1387                                 goto f_err;
1388                                 }
1389                         rsa=pkey->pkey.rsa;
1390                         }
1391
1392                 /* TLS */
1393                 if (s->version > SSL3_VERSION)
1394                         {
1395                         n2s(p,i);
1396                         if (n != i+2)
1397                                 {
1398                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1399                                         {
1400                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1401                                         goto err;
1402                                         }
1403                                 else
1404                                         p-=2;
1405                                 }
1406                         else
1407                                 n=i;
1408                         }
1409
1410                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1411
1412                 al = -1;
1413
1414                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1415                         {
1416                         al=SSL_AD_DECODE_ERROR;
1417                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1418                         }
1419
1420                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1421                         {
1422                         /* The premaster secret must contain the same version number as the
1423                          * ClientHello to detect version rollback attacks (strangely, the
1424                          * protocol does not offer such protection for DH ciphersuites).
1425                          * However, buggy clients exist that send the negotiated protocol
1426                          * version instead if the server does not support the requested
1427                          * protocol version.
1428                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1429                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1430                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1431                                 {
1432                                 al=SSL_AD_DECODE_ERROR;
1433                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1434                                 goto f_err;
1435                                 }
1436                         }
1437
1438                 if (al != -1)
1439                         {
1440 #if 0
1441                         goto f_err;
1442 #else
1443                         /* Some decryption failure -- use random value instead as countermeasure
1444                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1445                          * (see RFC 2246, section 7.4.7.1).
1446                          * But note that due to length and protocol version checking, the
1447                          * attack is impractical anyway (see section 5 in D. Bleichenbacher:
1448                          * "Chosen Ciphertext Attacks Against Protocols Based on the RSA
1449                          * Encryption Standard PKCS #1", CRYPTO '98, LNCS 1462, pp. 1-12).
1450                          */
1451                         ERR_clear_error();
1452                         i = SSL_MAX_MASTER_KEY_LENGTH;
1453                         p[0] = s->client_version >> 8;
1454                         p[1] = s->client_version & 0xff;
1455                         RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */
1456 #endif
1457                         }
1458
1459                 s->session->master_key_length=
1460                         s->method->ssl3_enc->generate_master_secret(s,
1461                                 s->session->master_key,
1462                                 p,i);
1463                 memset(p,0,i);
1464                 }
1465         else
1466 #endif
1467 #ifndef NO_DH
1468                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1469                 {
1470                 n2s(p,i);
1471                 if (n != i+2)
1472                         {
1473                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1474                                 {
1475                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1476                                 goto err;
1477                                 }
1478                         else
1479                                 {
1480                                 p-=2;
1481                                 i=(int)n;
1482                                 }
1483                         }
1484
1485                 if (n == 0L) /* the parameters are in the cert */
1486                         {
1487                         al=SSL_AD_HANDSHAKE_FAILURE;
1488                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1489                         goto f_err;
1490                         }
1491                 else
1492                         {
1493                         if (s->s3->tmp.dh == NULL)
1494                                 {
1495                                 al=SSL_AD_HANDSHAKE_FAILURE;
1496                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1497                                 goto f_err;
1498                                 }
1499                         else
1500                                 dh_srvr=s->s3->tmp.dh;
1501                         }
1502
1503                 pub=BN_bin2bn(p,i,NULL);
1504                 if (pub == NULL)
1505                         {
1506                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1507                         goto err;
1508                         }
1509
1510                 i=DH_compute_key(p,pub,dh_srvr);
1511
1512                 if (i <= 0)
1513                         {
1514                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1515                         goto err;
1516                         }
1517
1518                 DH_free(s->s3->tmp.dh);
1519                 s->s3->tmp.dh=NULL;
1520
1521                 BN_clear_free(pub);
1522                 pub=NULL;
1523                 s->session->master_key_length=
1524                         s->method->ssl3_enc->generate_master_secret(s,
1525                                 s->session->master_key,p,i);
1526                 memset(p,0,i);
1527                 }
1528         else
1529 #endif
1530                 {
1531                 al=SSL_AD_HANDSHAKE_FAILURE;
1532                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1533                 goto f_err;
1534                 }
1535
1536         return(1);
1537 f_err:
1538         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1539 #if !defined(NO_DH) || !defined(NO_RSA)
1540 err:
1541 #endif
1542         return(-1);
1543         }
1544
1545 static int ssl3_get_cert_verify(SSL *s)
1546         {
1547         EVP_PKEY *pkey=NULL;
1548         unsigned char *p;
1549         int al,ok,ret=0;
1550         long n;
1551         int type=0,i,j;
1552         X509 *peer;
1553
1554         n=ssl3_get_message(s,
1555                 SSL3_ST_SR_CERT_VRFY_A,
1556                 SSL3_ST_SR_CERT_VRFY_B,
1557                 -1,
1558                 512, /* 512? */
1559                 &ok);
1560
1561         if (!ok) return((int)n);
1562
1563         if (s->session->peer != NULL)
1564                 {
1565                 peer=s->session->peer;
1566                 pkey=X509_get_pubkey(peer);
1567                 type=X509_certificate_type(peer,pkey);
1568                 }
1569         else
1570                 {
1571                 peer=NULL;
1572                 pkey=NULL;
1573                 }
1574
1575         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1576                 {
1577                 s->s3->tmp.reuse_message=1;
1578                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1579                         {
1580                         al=SSL_AD_UNEXPECTED_MESSAGE;
1581                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1582                         goto f_err;
1583                         }
1584                 ret=1;
1585                 goto end;
1586                 }
1587
1588         if (peer == NULL)
1589                 {
1590                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1591                 al=SSL_AD_UNEXPECTED_MESSAGE;
1592                 goto f_err;
1593                 }
1594
1595         if (!(type & EVP_PKT_SIGN))
1596                 {
1597                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1598                 al=SSL_AD_ILLEGAL_PARAMETER;
1599                 goto f_err;
1600                 }
1601
1602         if (s->s3->change_cipher_spec)
1603                 {
1604                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1605                 al=SSL_AD_UNEXPECTED_MESSAGE;
1606                 goto f_err;
1607                 }
1608
1609         /* we now have a signature that we need to verify */
1610         p=(unsigned char *)s->init_buf->data;
1611         n2s(p,i);
1612         n-=2;
1613         if (i > n)
1614                 {
1615                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1616                 al=SSL_AD_DECODE_ERROR;
1617                 goto f_err;
1618                 }
1619
1620         j=EVP_PKEY_size(pkey);
1621         if ((i > j) || (n > j) || (n <= 0))
1622                 {
1623                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1624                 al=SSL_AD_DECODE_ERROR;
1625                 goto f_err;
1626                 }
1627
1628 #ifndef NO_RSA
1629         if (pkey->type == EVP_PKEY_RSA)
1630                 {
1631                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1632                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1633                                                         pkey->pkey.rsa);
1634                 if (i < 0)
1635                         {
1636                         al=SSL_AD_DECRYPT_ERROR;
1637                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1638                         goto f_err;
1639                         }
1640                 if (i == 0)
1641                         {
1642                         al=SSL_AD_DECRYPT_ERROR;
1643                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1644                         goto f_err;
1645                         }
1646                 }
1647         else
1648 #endif
1649 #ifndef NO_DSA
1650                 if (pkey->type == EVP_PKEY_DSA)
1651                 {
1652                 j=DSA_verify(pkey->save_type,
1653                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1654                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1655                 if (j <= 0)
1656                         {
1657                         /* bad signature */
1658                         al=SSL_AD_DECRYPT_ERROR;
1659                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1660                         goto f_err;
1661                         }
1662                 }
1663         else
1664 #endif
1665                 {
1666                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1667                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1668                 goto f_err;
1669                 }
1670
1671
1672         ret=1;
1673         if (0)
1674                 {
1675 f_err:
1676                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1677                 }
1678 end:
1679         EVP_PKEY_free(pkey);
1680         return(ret);
1681         }
1682
1683 static int ssl3_get_client_certificate(SSL *s)
1684         {
1685         int i,ok,al,ret= -1;
1686         X509 *x=NULL;
1687         unsigned long l,nc,llen,n;
1688         unsigned char *p,*d,*q;
1689         STACK_OF(X509) *sk=NULL;
1690
1691         n=ssl3_get_message(s,
1692                 SSL3_ST_SR_CERT_A,
1693                 SSL3_ST_SR_CERT_B,
1694                 -1,
1695 #if defined(MSDOS) && !defined(WIN32)
1696                 1024*30, /* 30k max cert list :-) */
1697 #else
1698                 1024*100, /* 100k max cert list :-) */
1699 #endif
1700                 &ok);
1701
1702         if (!ok) return((int)n);
1703
1704         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1705                 {
1706                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1707                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1708                         {
1709                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1710                         al=SSL_AD_HANDSHAKE_FAILURE;
1711                         goto f_err;
1712                         }
1713                 /* If tls asked for a client cert, the client must return a 0 list */
1714                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1715                         {
1716                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1717                         al=SSL_AD_UNEXPECTED_MESSAGE;
1718                         goto f_err;
1719                         }
1720                 s->s3->tmp.reuse_message=1;
1721                 return(1);
1722                 }
1723
1724         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1725                 {
1726                 al=SSL_AD_UNEXPECTED_MESSAGE;
1727                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1728                 goto f_err;
1729                 }
1730         d=p=(unsigned char *)s->init_buf->data;
1731
1732         if ((sk=sk_X509_new_null()) == NULL)
1733                 {
1734                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1735                 goto err;
1736                 }
1737
1738         n2l3(p,llen);
1739         if (llen+3 != n)
1740                 {
1741                 al=SSL_AD_DECODE_ERROR;
1742                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1743                 goto f_err;
1744                 }
1745         for (nc=0; nc<llen; )
1746                 {
1747                 n2l3(p,l);
1748                 if ((l+nc+3) > llen)
1749                         {
1750                         al=SSL_AD_DECODE_ERROR;
1751                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1752                         goto f_err;
1753                         }
1754
1755                 q=p;
1756                 x=d2i_X509(NULL,&p,l);
1757                 if (x == NULL)
1758                         {
1759                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1760                         goto err;
1761                         }
1762                 if (p != (q+l))
1763                         {
1764                         al=SSL_AD_DECODE_ERROR;
1765                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1766                         goto f_err;
1767                         }
1768                 if (!sk_X509_push(sk,x))
1769                         {
1770                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1771                         goto err;
1772                         }
1773                 x=NULL;
1774                 nc+=l+3;
1775                 }
1776
1777         if (sk_X509_num(sk) <= 0)
1778                 {
1779                 /* TLS does not mind 0 certs returned */
1780                 if (s->version == SSL3_VERSION)
1781                         {
1782                         al=SSL_AD_HANDSHAKE_FAILURE;
1783                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1784                         goto f_err;
1785                         }
1786                 /* Fail for TLS only if we required a certificate */
1787                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1788                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1789                         {
1790                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1791                         al=SSL_AD_HANDSHAKE_FAILURE;
1792                         goto f_err;
1793                         }
1794                 }
1795         else
1796                 {
1797                 i=ssl_verify_cert_chain(s,sk);
1798                 if (!i)
1799                         {
1800                         al=ssl_verify_alarm_type(s->verify_result);
1801                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1802                         goto f_err;
1803                         }
1804                 }
1805
1806         if (s->session->peer != NULL) /* This should not be needed */
1807                 X509_free(s->session->peer);
1808         s->session->peer=sk_X509_shift(sk);
1809         s->session->verify_result = s->verify_result;
1810
1811         /* With the current implementation, sess_cert will always be NULL
1812          * when we arrive here. */
1813         if (s->session->sess_cert == NULL)
1814                 {
1815                 s->session->sess_cert = ssl_sess_cert_new();
1816                 if (s->session->sess_cert == NULL)
1817                         {
1818                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1819                         goto err;
1820                         }
1821                 }
1822         if (s->session->sess_cert->cert_chain != NULL)
1823                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1824         s->session->sess_cert->cert_chain=sk;
1825         /* Inconsistency alert: cert_chain does *not* include the
1826          * peer's own certificate, while we do include it in s3_clnt.c */
1827
1828         sk=NULL;
1829
1830         ret=1;
1831         if (0)
1832                 {
1833 f_err:
1834                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1835                 }
1836 err:
1837         if (x != NULL) X509_free(x);
1838         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1839         return(ret);
1840         }
1841
1842 int ssl3_send_server_certificate(SSL *s)
1843         {
1844         unsigned long l;
1845         X509 *x;
1846
1847         if (s->state == SSL3_ST_SW_CERT_A)
1848                 {
1849                 x=ssl_get_server_send_cert(s);
1850                 if (x == NULL)
1851                         {
1852                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1853                         return(0);
1854                         }
1855
1856                 l=ssl3_output_cert_chain(s,x);
1857                 s->state=SSL3_ST_SW_CERT_B;
1858                 s->init_num=(int)l;
1859                 s->init_off=0;
1860                 }
1861
1862         /* SSL3_ST_SW_CERT_B */
1863         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1864         }