ssl/s3_clnt.c

   1 /* ssl/s3_clnt.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) 1998-2007 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  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #include <stdio.h>
 152 #include "ssl_locl.h"
 153 #include "kssl_lcl.h"
 154 #include <openssl/buffer.h>
 155 #include <openssl/rand.h>
 156 #include <openssl/objects.h>
 157 #include <openssl/evp.h>
 158 #include <openssl/md5.h>
 159 #ifndef OPENSSL_NO_DH
 160 #include <openssl/dh.h>
 161 #endif
 162 #include <openssl/bn.h>
 163
 164 static const SSL_METHOD *ssl3_get_client_method(int ver);
 165 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 166 #ifndef OPENSSL_NO_TLSEXT
 167 static int ssl3_check_finished(SSL *s);
 168 #endif
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver)
 171         {
 172         if (ver == SSL3_VERSION)
 173                 return(SSLv3_client_method());
 174         else
 175                 return(NULL);
 176         }
 177
 178 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 179                         ssl_undefined_function,
 180                         ssl3_connect,
 181                         ssl3_get_client_method)
 182
 183 int ssl3_connect(SSL *s)
 184         {
 185         BUF_MEM *buf=NULL;
 186         unsigned long Time=(unsigned long)time(NULL);
 187         long num1;
 188         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 189         int ret= -1;
 190         int new_state,state,skip=0;;
 191
 192         RAND_add(&Time,sizeof(Time),0);
 193         ERR_clear_error();
 194         clear_sys_error();
 195
 196         if (s->info_callback != NULL)
 197                 cb=s->info_callback;
 198         else if (s->ctx->info_callback != NULL)
 199                 cb=s->ctx->info_callback;
 200
 201         s->in_handshake++;
 202         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 203
 204         for (;;)
 205                 {
 206                 state=s->state;
 207
 208                 switch(s->state)
 209                         {
 210                 case SSL_ST_RENEGOTIATE:
 211                         s->new_session=1;
 212                         s->state=SSL_ST_CONNECT;
 213                         s->ctx->stats.sess_connect_renegotiate++;
 214                         /* break */
 215                 case SSL_ST_BEFORE:
 216                 case SSL_ST_CONNECT:
 217                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 218                 case SSL_ST_OK|SSL_ST_CONNECT:
 219
 220                         s->server=0;
 221                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 222
 223                         if ((s->version & 0xff00 ) != 0x0300)
 224                                 {
 225                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 226                                 ret = -1;
 227                                 goto end;
 228                                 }
 229
 230                         /* s->version=SSL3_VERSION; */
 231                         s->type=SSL_ST_CONNECT;
 232
 233                         if (s->init_buf == NULL)
 234                                 {
 235                                 if ((buf=BUF_MEM_new()) == NULL)
 236                                         {
 237                                         ret= -1;
 238                                         goto end;
 239                                         }
 240                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 241                                         {
 242                                         ret= -1;
 243                                         goto end;
 244                                         }
 245                                 s->init_buf=buf;
 246                                 buf=NULL;
 247                                 }
 248
 249                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 250
 251                         /* setup buffing BIO */
 252                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 253
 254                         /* don't push the buffering BIO quite yet */
 255
 256                         ssl3_init_finished_mac(s);
 257
 258                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 259                         s->ctx->stats.sess_connect++;
 260                         s->init_num=0;
 261                         break;
 262
 263                 case SSL3_ST_CW_CLNT_HELLO_A:
 264                 case SSL3_ST_CW_CLNT_HELLO_B:
 265
 266                         s->shutdown=0;
 267                         ret=ssl3_client_hello(s);
 268                         if (ret <= 0) goto end;
 269                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 270                         s->init_num=0;
 271
 272                         /* turn on buffering for the next lot of output */
 273                         if (s->bbio != s->wbio)
 274                                 s->wbio=BIO_push(s->bbio,s->wbio);
 275
 276                         break;
 277
 278                 case SSL3_ST_CR_SRVR_HELLO_A:
 279                 case SSL3_ST_CR_SRVR_HELLO_B:
 280                         ret=ssl3_get_server_hello(s);
 281                         if (ret <= 0) goto end;
 282
 283                         if (s->hit)
 284                                 s->state=SSL3_ST_CR_FINISHED_A;
 285                         else
 286                                 s->state=SSL3_ST_CR_CERT_A;
 287                         s->init_num=0;
 288                         break;
 289
 290                 case SSL3_ST_CR_CERT_A:
 291                 case SSL3_ST_CR_CERT_B:
 292 #ifndef OPENSSL_NO_TLSEXT
 293                         ret=ssl3_check_finished(s);
 294                         if (ret <= 0) goto end;
 295                         if (ret == 2)
 296                                 {
 297                                 s->hit = 1;
 298                                 s->state=SSL3_ST_CR_FINISHED_A;
 299                                 s->init_num=0;
 300                                 break;
 301                                 }
 302 #endif
 303                         /* Check if it is anon DH/ECDH */
 304                         /* or PSK */
 305                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 306                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 307                                 {
 308                                 ret=ssl3_get_server_certificate(s);
 309                                 if (ret <= 0) goto end;
 310                                 }
 311                         else
 312                                 skip=1;
 313                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 314                         s->init_num=0;
 315                         break;
 316
 317                 case SSL3_ST_CR_KEY_EXCH_A:
 318                 case SSL3_ST_CR_KEY_EXCH_B:
 319                         ret=ssl3_get_key_exchange(s);
 320                         if (ret <= 0) goto end;
 321                         s->state=SSL3_ST_CR_CERT_REQ_A;
 322                         s->init_num=0;
 323
 324                         /* at this point we check that we have the
 325                          * required stuff from the server */
 326                         if (!ssl3_check_cert_and_algorithm(s))
 327                                 {
 328                                 ret= -1;
 329                                 goto end;
 330                                 }
 331                         break;
 332
 333                 case SSL3_ST_CR_CERT_REQ_A:
 334                 case SSL3_ST_CR_CERT_REQ_B:
 335                         ret=ssl3_get_certificate_request(s);
 336                         if (ret <= 0) goto end;
 337                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 338                         s->init_num=0;
 339                         break;
 340
 341                 case SSL3_ST_CR_SRVR_DONE_A:
 342                 case SSL3_ST_CR_SRVR_DONE_B:
 343                         ret=ssl3_get_server_done(s);
 344                         if (ret <= 0) goto end;
 345                         if (s->s3->tmp.cert_req)
 346                                 s->state=SSL3_ST_CW_CERT_A;
 347                         else
 348                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 349                         s->init_num=0;
 350
 351                         break;
 352
 353                 case SSL3_ST_CW_CERT_A:
 354                 case SSL3_ST_CW_CERT_B:
 355                 case SSL3_ST_CW_CERT_C:
 356                 case SSL3_ST_CW_CERT_D:
 357                         ret=ssl3_send_client_certificate(s);
 358                         if (ret <= 0) goto end;
 359                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 360                         s->init_num=0;
 361                         break;
 362
 363                 case SSL3_ST_CW_KEY_EXCH_A:
 364                 case SSL3_ST_CW_KEY_EXCH_B:
 365                         ret=ssl3_send_client_key_exchange(s);
 366                         if (ret <= 0) goto end;
 367                         /* EAY EAY EAY need to check for DH fix cert
 368                          * sent back */
 369                         /* For TLS, cert_req is set to 2, so a cert chain
 370                          * of nothing is sent, but no verify packet is sent */
 371                         /* XXX: For now, we do not support client
 372                          * authentication in ECDH cipher suites with
 373                          * ECDH (rather than ECDSA) certificates.
 374                          * We need to skip the certificate verify
 375                          * message when client's ECDH public key is sent
 376                          * inside the client certificate.
 377                          */
 378                         if (s->s3->tmp.cert_req == 1)
 379                                 {
 380                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 381                                 }
 382                         else
 383                                 {
 384                                 s->state=SSL3_ST_CW_CHANGE_A;
 385                                 s->s3->change_cipher_spec=0;
 386                                 }
 387
 388                         s->init_num=0;
 389                         break;
 390
 391                 case SSL3_ST_CW_CERT_VRFY_A:
 392                 case SSL3_ST_CW_CERT_VRFY_B:
 393                         ret=ssl3_send_client_verify(s);
 394                         if (ret <= 0) goto end;
 395                         s->state=SSL3_ST_CW_CHANGE_A;
 396                         s->init_num=0;
 397                         s->s3->change_cipher_spec=0;
 398                         break;
 399
 400                 case SSL3_ST_CW_CHANGE_A:
 401                 case SSL3_ST_CW_CHANGE_B:
 402                         ret=ssl3_send_change_cipher_spec(s,
 403                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 404                         if (ret <= 0) goto end;
 405                         s->state=SSL3_ST_CW_FINISHED_A;
 406                         s->init_num=0;
 407
 408                         s->session->cipher=s->s3->tmp.new_cipher;
 409 #ifdef OPENSSL_NO_COMP
 410                         s->session->compress_meth=0;
 411 #else
 412                         if (s->s3->tmp.new_compression == NULL)
 413                                 s->session->compress_meth=0;
 414                         else
 415                                 s->session->compress_meth=
 416                                         s->s3->tmp.new_compression->id;
 417 #endif
 418                         if (!s->method->ssl3_enc->setup_key_block(s))
 419                                 {
 420                                 ret= -1;
 421                                 goto end;
 422                                 }
 423
 424                         if (!s->method->ssl3_enc->change_cipher_state(s,
 425                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 426                                 {
 427                                 ret= -1;
 428                                 goto end;
 429                                 }
 430
 431                         break;
 432
 433                 case SSL3_ST_CW_FINISHED_A:
 434                 case SSL3_ST_CW_FINISHED_B:
 435                         ret=ssl3_send_finished(s,
 436                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 437                                 s->method->ssl3_enc->client_finished_label,
 438                                 s->method->ssl3_enc->client_finished_label_len);
 439                         if (ret <= 0) goto end;
 440                         s->state=SSL3_ST_CW_FLUSH;
 441
 442                         /* clear flags */
 443                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 444                         if (s->hit)
 445                                 {
 446                                 s->s3->tmp.next_state=SSL_ST_OK;
 447                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 448                                         {
 449                                         s->state=SSL_ST_OK;
 450                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 451                                         s->s3->delay_buf_pop_ret=0;
 452                                         }
 453                                 }
 454                         else
 455                                 {
 456 #ifndef OPENSSL_NO_TLSEXT
 457                                 /* Allow NewSessionTicket if ticket expected */
 458                                 if (s->tlsext_ticket_expected)
 459                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 460                                 else
 461 #endif
 462
 463                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 464                                 }
 465                         s->init_num=0;
 466                         break;
 467
 468 #ifndef OPENSSL_NO_TLSEXT
 469                 case SSL3_ST_CR_SESSION_TICKET_A:
 470                 case SSL3_ST_CR_SESSION_TICKET_B:
 471                         ret=ssl3_get_new_session_ticket(s);
 472                         if (ret <= 0) goto end;
 473                         s->state=SSL3_ST_CR_FINISHED_A;
 474                         s->init_num=0;
 475                 break;
 476 #endif
 477
 478                 case SSL3_ST_CR_FINISHED_A:
 479                 case SSL3_ST_CR_FINISHED_B:
 480
 481                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 482                                 SSL3_ST_CR_FINISHED_B);
 483                         if (ret <= 0) goto end;
 484
 485                         if (s->hit)
 486                                 s->state=SSL3_ST_CW_CHANGE_A;
 487                         else
 488                                 s->state=SSL_ST_OK;
 489                         s->init_num=0;
 490                         break;
 491
 492                 case SSL3_ST_CW_FLUSH:
 493                         /* number of bytes to be flushed */
 494                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 495                         if (num1 > 0)
 496                                 {
 497                                 s->rwstate=SSL_WRITING;
 498                                 num1=BIO_flush(s->wbio);
 499                                 if (num1 <= 0) { ret= -1; goto end; }
 500                                 s->rwstate=SSL_NOTHING;
 501                                 }
 502
 503                         s->state=s->s3->tmp.next_state;
 504                         break;
 505
 506                 case SSL_ST_OK:
 507                         /* clean a few things up */
 508                         ssl3_cleanup_key_block(s);
 509
 510                         if (s->init_buf != NULL)
 511                                 {
 512                                 BUF_MEM_free(s->init_buf);
 513                                 s->init_buf=NULL;
 514                                 }
 515
 516                         /* If we are not 'joining' the last two packets,
 517                          * remove the buffering now */
 518                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 519                                 ssl_free_wbio_buffer(s);
 520                         /* else do it later in ssl3_write */
 521
 522                         s->init_num=0;
 523                         s->new_session=0;
 524
 525                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 526                         if (s->hit) s->ctx->stats.sess_hit++;
 527
 528                         ret=1;
 529                         /* s->server=0; */
 530                         s->handshake_func=ssl3_connect;
 531                         s->ctx->stats.sess_connect_good++;
 532
 533                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 534
 535                         goto end;
 536                         /* break; */
 537
 538                 default:
 539                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 540                         ret= -1;
 541                         goto end;
 542                         /* break; */
 543                         }
 544
 545                 /* did we do anything */
 546                 if (!s->s3->tmp.reuse_message && !skip)
 547                         {
 548                         if (s->debug)
 549                                 {
 550                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 551                                         goto end;
 552                                 }
 553
 554                         if ((cb != NULL) && (s->state != state))
 555                                 {
 556                                 new_state=s->state;
 557                                 s->state=state;
 558                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 559                                 s->state=new_state;
 560                                 }
 561                         }
 562                 skip=0;
 563                 }
 564 end:
 565         s->in_handshake--;
 566         if (buf != NULL)
 567                 BUF_MEM_free(buf);
 568         if (cb != NULL)
 569                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 570         return(ret);
 571         }
 572
 573
 574 int ssl3_client_hello(SSL *s)
 575         {
 576         unsigned char *buf;
 577         unsigned char *p,*d;
 578         int i;
 579         unsigned long Time,l;
 580 #ifndef OPENSSL_NO_COMP
 581         int j;
 582         SSL_COMP *comp;
 583 #endif
 584
 585         buf=(unsigned char *)s->init_buf->data;
 586         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 587                 {
 588                 if ((s->session == NULL) ||
 589                         (s->session->ssl_version != s->version) ||
 590                         (s->session->not_resumable))
 591                         {
 592                         if (!ssl_get_new_session(s,0))
 593                                 goto err;
 594                         }
 595                 /* else use the pre-loaded session */
 596
 597                 p=s->s3->client_random;
 598                 Time=(unsigned long)time(NULL);                 /* Time */
 599                 l2n(Time,p);
 600                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 601                         goto err;
 602
 603                 /* Do the message type and length last */
 604                 d=p= &(buf[4]);
 605
 606                 *(p++)=s->version>>8;
 607                 *(p++)=s->version&0xff;
 608                 s->client_version=s->version;
 609
 610                 /* Random stuff */
 611                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 612                 p+=SSL3_RANDOM_SIZE;
 613
 614                 /* Session ID */
 615                 if (s->new_session)
 616                         i=0;
 617                 else
 618                         i=s->session->session_id_length;
 619                 *(p++)=i;
 620                 if (i != 0)
 621                         {
 622                         if (i > (int)sizeof(s->session->session_id))
 623                                 {
 624                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 625                                 goto err;
 626                                 }
 627                         memcpy(p,s->session->session_id,i);
 628                         p+=i;
 629                         }
 630
 631                 /* Ciphers supported */
 632                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 633                 if (i == 0)
 634                         {
 635                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 636                         goto err;
 637                         }
 638                 s2n(i,p);
 639                 p+=i;
 640
 641                 /* COMPRESSION */
 642 #ifdef OPENSSL_NO_COMP
 643                 *(p++)=1;
 644 #else
 645
 646                 if ((s->options & SSL_OP_NO_COMPRESSION)
 647                                         || !s->ctx->comp_methods)
 648                         j=0;
 649                 else
 650                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 651                 *(p++)=1+j;
 652                 for (i=0; i<j; i++)
 653                         {
 654                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 655                         *(p++)=comp->id;
 656                         }
 657 #endif
 658                 *(p++)=0; /* Add the NULL method */
 659 #ifndef OPENSSL_NO_TLSEXT
 660                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 661                         {
 662                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 663                         goto err;
 664                         }
 665                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 666                         {
 667                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 668                         goto err;
 669                         }
 670 #endif
 671
 672                 l=(p-d);
 673                 d=buf;
 674                 *(d++)=SSL3_MT_CLIENT_HELLO;
 675                 l2n3(l,d);
 676
 677                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 678                 /* number of bytes to write */
 679                 s->init_num=p-buf;
 680                 s->init_off=0;
 681                 }
 682
 683         /* SSL3_ST_CW_CLNT_HELLO_B */
 684         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 685 err:
 686         return(-1);
 687         }
 688
 689 int ssl3_get_server_hello(SSL *s)
 690         {
 691         STACK_OF(SSL_CIPHER) *sk;
 692         SSL_CIPHER *c;
 693         unsigned char *p,*d;
 694         int i,al,ok;
 695         unsigned int j;
 696         long n;
 697 #ifndef OPENSSL_NO_COMP
 698         SSL_COMP *comp;
 699 #endif
 700
 701         n=s->method->ssl_get_message(s,
 702                 SSL3_ST_CR_SRVR_HELLO_A,
 703                 SSL3_ST_CR_SRVR_HELLO_B,
 704                 -1,
 705                 20000, /* ?? */
 706                 &ok);
 707
 708         if (!ok) return((int)n);
 709
 710         if ( SSL_version(s) == DTLS1_VERSION)
 711                 {
 712                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 713                         {
 714                         if ( s->d1->send_cookie == 0)
 715                                 {
 716                                 s->s3->tmp.reuse_message = 1;
 717                                 return 1;
 718                                 }
 719                         else /* already sent a cookie */
 720                                 {
 721                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 722                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 723                                 goto f_err;
 724                                 }
 725                         }
 726                 }
 727
 728         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 729                 {
 730                 al=SSL_AD_UNEXPECTED_MESSAGE;
 731                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 732                 goto f_err;
 733                 }
 734
 735         d=p=(unsigned char *)s->init_msg;
 736
 737         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 738                 {
 739                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 740                 s->version=(s->version&0xff00)|p[1];
 741                 al=SSL_AD_PROTOCOL_VERSION;
 742                 goto f_err;
 743                 }
 744         p+=2;
 745
 746         /* load the server hello data */
 747         /* load the server random */
 748         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 749         p+=SSL3_RANDOM_SIZE;
 750
 751         /* get the session-id */
 752         j= *(p++);
 753
 754         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 755                 {
 756                 al=SSL_AD_ILLEGAL_PARAMETER;
 757                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 758                 goto f_err;
 759                 }
 760
 761         if (j != 0 && j == s->session->session_id_length
 762             && memcmp(p,s->session->session_id,j) == 0)
 763             {
 764             if(s->sid_ctx_length != s->session->sid_ctx_length
 765                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 766                 {
 767                 /* actually a client application bug */
 768                 al=SSL_AD_ILLEGAL_PARAMETER;
 769                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 770                 goto f_err;
 771                 }
 772             s->hit=1;
 773             }
 774         else    /* a miss or crap from the other end */
 775                 {
 776                 /* If we were trying for session-id reuse, make a new
 777                  * SSL_SESSION so we don't stuff up other people */
 778                 s->hit=0;
 779                 if (s->session->session_id_length > 0)
 780                         {
 781                         if (!ssl_get_new_session(s,0))
 782                                 {
 783                                 al=SSL_AD_INTERNAL_ERROR;
 784                                 goto f_err;
 785                                 }
 786                         }
 787                 s->session->session_id_length=j;
 788                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 789                 }
 790         p+=j;
 791         c=ssl_get_cipher_by_char(s,p);
 792         if (c == NULL)
 793                 {
 794                 /* unknown cipher */
 795                 al=SSL_AD_ILLEGAL_PARAMETER;
 796                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 797                 goto f_err;
 798                 }
 799         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 800
 801         sk=ssl_get_ciphers_by_id(s);
 802         i=sk_SSL_CIPHER_find(sk,c);
 803         if (i < 0)
 804                 {
 805                 /* we did not say we would use this cipher */
 806                 al=SSL_AD_ILLEGAL_PARAMETER;
 807                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 808                 goto f_err;
 809                 }
 810
 811         /* Depending on the session caching (internal/external), the cipher
 812            and/or cipher_id values may not be set. Make sure that
 813            cipher_id is set and use it for comparison. */
 814         if (s->session->cipher)
 815                 s->session->cipher_id = s->session->cipher->id;
 816         if (s->hit && (s->session->cipher_id != c->id))
 817                 {
 818                 if (!(s->options &
 819                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 820                         {
 821                         al=SSL_AD_ILLEGAL_PARAMETER;
 822                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 823                         goto f_err;
 824                         }
 825                 }
 826         s->s3->tmp.new_cipher=c;
 827         ssl3_digest_cached_records(s);
 828
 829         /* lets get the compression algorithm */
 830         /* COMPRESSION */
 831 #ifdef OPENSSL_NO_COMP
 832         if (*(p++) != 0)
 833                 {
 834                 al=SSL_AD_ILLEGAL_PARAMETER;
 835                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 836                 goto f_err;
 837                 }
 838 #else
 839         j= *(p++);
 840         if ((j == 0) || (s->options & SSL_OP_NO_COMPRESSION))
 841                 comp=NULL;
 842         else
 843                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 844
 845         if ((j != 0) && (comp == NULL))
 846                 {
 847                 al=SSL_AD_ILLEGAL_PARAMETER;
 848                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 849                 goto f_err;
 850                 }
 851         else
 852                 {
 853                 s->s3->tmp.new_compression=comp;
 854                 }
 855 #endif
 856 #ifndef OPENSSL_NO_TLSEXT
 857         /* TLS extensions*/
 858         if (s->version > SSL3_VERSION)
 859                 {
 860                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 861                         {
 862                         /* 'al' set by ssl_parse_serverhello_tlsext */
 863                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 864                         goto f_err;
 865                         }
 866                 if (ssl_check_serverhello_tlsext(s) <= 0)
 867                         {
 868                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 869                                 goto err;
 870                         }
 871                 }
 872 #endif
 873
 874         if (p != (d+n))
 875                 {
 876                 /* wrong packet length */
 877                 al=SSL_AD_DECODE_ERROR;
 878                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 879                 goto err;
 880                 }
 881
 882         return(1);
 883 f_err:
 884         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 885 err:
 886         return(-1);
 887         }
 888
 889 int ssl3_get_server_certificate(SSL *s)
 890         {
 891         int al,i,ok,ret= -1;
 892         unsigned long n,nc,llen,l;
 893         X509 *x=NULL;
 894         const unsigned char *q,*p;
 895         unsigned char *d;
 896         STACK_OF(X509) *sk=NULL;
 897         SESS_CERT *sc;
 898         EVP_PKEY *pkey=NULL;
 899         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 900
 901         n=s->method->ssl_get_message(s,
 902                 SSL3_ST_CR_CERT_A,
 903                 SSL3_ST_CR_CERT_B,
 904                 -1,
 905                 s->max_cert_list,
 906                 &ok);
 907
 908         if (!ok) return((int)n);
 909
 910         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 911                 {
 912                 s->s3->tmp.reuse_message=1;
 913                 return(1);
 914                 }
 915
 916         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 917                 {
 918                 al=SSL_AD_UNEXPECTED_MESSAGE;
 919                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 920                 goto f_err;
 921                 }
 922         p=d=(unsigned char *)s->init_msg;
 923
 924         if ((sk=sk_X509_new_null()) == NULL)
 925                 {
 926                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 927                 goto err;
 928                 }
 929
 930         n2l3(p,llen);
 931         if (llen+3 != n)
 932                 {
 933                 al=SSL_AD_DECODE_ERROR;
 934                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 935                 goto f_err;
 936                 }
 937         for (nc=0; nc<llen; )
 938                 {
 939                 n2l3(p,l);
 940                 if ((l+nc+3) > llen)
 941                         {
 942                         al=SSL_AD_DECODE_ERROR;
 943                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 944                         goto f_err;
 945                         }
 946
 947                 q=p;
 948                 x=d2i_X509(NULL,&q,l);
 949                 if (x == NULL)
 950                         {
 951                         al=SSL_AD_BAD_CERTIFICATE;
 952                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 953                         goto f_err;
 954                         }
 955                 if (q != (p+l))
 956                         {
 957                         al=SSL_AD_DECODE_ERROR;
 958                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 959                         goto f_err;
 960                         }
 961                 if (!sk_X509_push(sk,x))
 962                         {
 963                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 964                         goto err;
 965                         }
 966                 x=NULL;
 967                 nc+=l+3;
 968                 p=q;
 969                 }
 970
 971         i=ssl_verify_cert_chain(s,sk);
 972         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 973 #ifndef OPENSSL_NO_KRB5
 974             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
 975                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 976 #endif /* OPENSSL_NO_KRB5 */
 977                 )
 978                 {
 979                 al=ssl_verify_alarm_type(s->verify_result);
 980                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 981                 goto f_err;
 982                 }
 983         ERR_clear_error(); /* but we keep s->verify_result */
 984
 985         sc=ssl_sess_cert_new();
 986         if (sc == NULL) goto err;
 987
 988         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 989         s->session->sess_cert=sc;
 990
 991         sc->cert_chain=sk;
 992         /* Inconsistency alert: cert_chain does include the peer's
 993          * certificate, which we don't include in s3_srvr.c */
 994         x=sk_X509_value(sk,0);
 995         sk=NULL;
 996         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 997
 998         pkey=X509_get_pubkey(x);
 999
1000         /* VRS: allow null cert if auth == KRB5 */
1001         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1002                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1003                     ? 0 : 1;
1004
1005 #ifdef KSSL_DEBUG
1006         printf("pkey,x = %p, %p\n", pkey,x);
1007         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1008         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1009                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1010 #endif    /* KSSL_DEBUG */
1011
1012         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1013                 {
1014                 x=NULL;
1015                 al=SSL3_AL_FATAL;
1016                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1017                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1018                 goto f_err;
1019                 }
1020
1021         i=ssl_cert_type(x,pkey);
1022         if (need_cert && i < 0)
1023                 {
1024                 x=NULL;
1025                 al=SSL3_AL_FATAL;
1026                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1027                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1028                 goto f_err;
1029                 }
1030
1031         if (need_cert)
1032                 {
1033                 sc->peer_cert_type=i;
1034                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1035                 /* Why would the following ever happen?
1036                  * We just created sc a couple of lines ago. */
1037                 if (sc->peer_pkeys[i].x509 != NULL)
1038                         X509_free(sc->peer_pkeys[i].x509);
1039                 sc->peer_pkeys[i].x509=x;
1040                 sc->peer_key= &(sc->peer_pkeys[i]);
1041
1042                 if (s->session->peer != NULL)
1043                         X509_free(s->session->peer);
1044                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1045                 s->session->peer=x;
1046                 }
1047         else
1048                 {
1049                 sc->peer_cert_type=i;
1050                 sc->peer_key= NULL;
1051
1052                 if (s->session->peer != NULL)
1053                         X509_free(s->session->peer);
1054                 s->session->peer=NULL;
1055                 }
1056         s->session->verify_result = s->verify_result;
1057
1058         x=NULL;
1059         ret=1;
1060
1061         if (0)
1062                 {
1063 f_err:
1064                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1065                 }
1066 err:
1067         EVP_PKEY_free(pkey);
1068         X509_free(x);
1069         sk_X509_pop_free(sk,X509_free);
1070         return(ret);
1071         }
1072
1073 int ssl3_get_key_exchange(SSL *s)
1074         {
1075 #ifndef OPENSSL_NO_RSA
1076         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1077 #endif
1078         EVP_MD_CTX md_ctx;
1079         unsigned char *param,*p;
1080         int al,i,j,param_len,ok;
1081         long n,alg_k,alg_a;
1082         EVP_PKEY *pkey=NULL;
1083 #ifndef OPENSSL_NO_RSA
1084         RSA *rsa=NULL;
1085 #endif
1086 #ifndef OPENSSL_NO_DH
1087         DH *dh=NULL;
1088 #endif
1089 #ifndef OPENSSL_NO_ECDH
1090         EC_KEY *ecdh = NULL;
1091         BN_CTX *bn_ctx = NULL;
1092         EC_POINT *srvr_ecpoint = NULL;
1093         int curve_nid = 0;
1094         int encoded_pt_len = 0;
1095 #endif
1096
1097         /* use same message size as in ssl3_get_certificate_request()
1098          * as ServerKeyExchange message may be skipped */
1099         n=s->method->ssl_get_message(s,
1100                 SSL3_ST_CR_KEY_EXCH_A,
1101                 SSL3_ST_CR_KEY_EXCH_B,
1102                 -1,
1103                 s->max_cert_list,
1104                 &ok);
1105         if (!ok) return((int)n);
1106
1107         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1108                 {
1109 #ifndef OPENSSL_NO_PSK
1110                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1111                    omitted if no identity hint is sent. Set
1112                    session->sess_cert anyway to avoid problems
1113                    later.*/
1114                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1115                         {
1116                         s->session->sess_cert=ssl_sess_cert_new();
1117                         if (s->ctx->psk_identity_hint)
1118                                 OPENSSL_free(s->ctx->psk_identity_hint);
1119                         s->ctx->psk_identity_hint = NULL;
1120                         }
1121 #endif
1122                 s->s3->tmp.reuse_message=1;
1123                 return(1);
1124                 }
1125
1126         param=p=(unsigned char *)s->init_msg;
1127         if (s->session->sess_cert != NULL)
1128                 {
1129 #ifndef OPENSSL_NO_RSA
1130                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1131                         {
1132                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1133                         s->session->sess_cert->peer_rsa_tmp=NULL;
1134                         }
1135 #endif
1136 #ifndef OPENSSL_NO_DH
1137                 if (s->session->sess_cert->peer_dh_tmp)
1138                         {
1139                         DH_free(s->session->sess_cert->peer_dh_tmp);
1140                         s->session->sess_cert->peer_dh_tmp=NULL;
1141                         }
1142 #endif
1143 #ifndef OPENSSL_NO_ECDH
1144                 if (s->session->sess_cert->peer_ecdh_tmp)
1145                         {
1146                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1147                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1148                         }
1149 #endif
1150                 }
1151         else
1152                 {
1153                 s->session->sess_cert=ssl_sess_cert_new();
1154                 }
1155
1156         param_len=0;
1157         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1158         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1159         EVP_MD_CTX_init(&md_ctx);
1160
1161 #ifndef OPENSSL_NO_PSK
1162         if (alg_k & SSL_kPSK)
1163                 {
1164                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1165
1166                 al=SSL_AD_HANDSHAKE_FAILURE;
1167                 n2s(p,i);
1168                 param_len=i+2;
1169                 /* Store PSK identity hint for later use, hint is used
1170                  * in ssl3_send_client_key_exchange.  Assume that the
1171                  * maximum length of a PSK identity hint can be as
1172                  * long as the maximum length of a PSK identity. */
1173                 if (i > PSK_MAX_IDENTITY_LEN)
1174                         {
1175                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1176                                 SSL_R_DATA_LENGTH_TOO_LONG);
1177                         goto f_err;
1178                         }
1179                 if (param_len > n)
1180                         {
1181                         al=SSL_AD_DECODE_ERROR;
1182                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1183                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1184                         goto f_err;
1185                         }
1186                 /* If received PSK identity hint contains NULL
1187                  * characters, the hint is truncated from the first
1188                  * NULL. p may not be ending with NULL, so create a
1189                  * NULL-terminated string. */
1190                 memcpy(tmp_id_hint, p, i);
1191                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1192                 if (s->ctx->psk_identity_hint != NULL)
1193                         OPENSSL_free(s->ctx->psk_identity_hint);
1194                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1195                 if (s->ctx->psk_identity_hint == NULL)
1196                         {
1197                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1198                         goto f_err;
1199                         }
1200
1201                 p+=i;
1202                 n-=param_len;
1203                 }
1204         else
1205 #endif /* !OPENSSL_NO_PSK */
1206 #ifndef OPENSSL_NO_RSA
1207         if (alg_k & SSL_kRSA)
1208                 {
1209                 if ((rsa=RSA_new()) == NULL)
1210                         {
1211                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1212                         goto err;
1213                         }
1214                 n2s(p,i);
1215                 param_len=i+2;
1216                 if (param_len > n)
1217                         {
1218                         al=SSL_AD_DECODE_ERROR;
1219                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1220                         goto f_err;
1221                         }
1222                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1223                         {
1224                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1225                         goto err;
1226                         }
1227                 p+=i;
1228
1229                 n2s(p,i);
1230                 param_len+=i+2;
1231                 if (param_len > n)
1232                         {
1233                         al=SSL_AD_DECODE_ERROR;
1234                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1235                         goto f_err;
1236                         }
1237                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1238                         {
1239                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1240                         goto err;
1241                         }
1242                 p+=i;
1243                 n-=param_len;
1244
1245                 /* this should be because we are using an export cipher */
1246                 if (alg_a & SSL_aRSA)
1247                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1248                 else
1249                         {
1250                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1251                         goto err;
1252                         }
1253                 s->session->sess_cert->peer_rsa_tmp=rsa;
1254                 rsa=NULL;
1255                 }
1256 #else /* OPENSSL_NO_RSA */
1257         if (0)
1258                 ;
1259 #endif
1260 #ifndef OPENSSL_NO_DH
1261         else if (alg_k & SSL_kEDH)
1262                 {
1263                 if ((dh=DH_new()) == NULL)
1264                         {
1265                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1266                         goto err;
1267                         }
1268                 n2s(p,i);
1269                 param_len=i+2;
1270                 if (param_len > n)
1271                         {
1272                         al=SSL_AD_DECODE_ERROR;
1273                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1274                         goto f_err;
1275                         }
1276                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1277                         {
1278                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1279                         goto err;
1280                         }
1281                 p+=i;
1282
1283                 n2s(p,i);
1284                 param_len+=i+2;
1285                 if (param_len > n)
1286                         {
1287                         al=SSL_AD_DECODE_ERROR;
1288                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1289                         goto f_err;
1290                         }
1291                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1292                         {
1293                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1294                         goto err;
1295                         }
1296                 p+=i;
1297
1298                 n2s(p,i);
1299                 param_len+=i+2;
1300                 if (param_len > n)
1301                         {
1302                         al=SSL_AD_DECODE_ERROR;
1303                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1304                         goto f_err;
1305                         }
1306                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1307                         {
1308                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1309                         goto err;
1310                         }
1311                 p+=i;
1312                 n-=param_len;
1313
1314 #ifndef OPENSSL_NO_RSA
1315                 if (alg_a & SSL_aRSA)
1316                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1317 #else
1318                 if (0)
1319                         ;
1320 #endif
1321 #ifndef OPENSSL_NO_DSA
1322                 else if (alg_a & SSL_aDSS)
1323                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1324 #endif
1325                 /* else anonymous DH, so no certificate or pkey. */
1326
1327                 s->session->sess_cert->peer_dh_tmp=dh;
1328                 dh=NULL;
1329                 }
1330         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1331                 {
1332                 al=SSL_AD_ILLEGAL_PARAMETER;
1333                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1334                 goto f_err;
1335                 }
1336 #endif /* !OPENSSL_NO_DH */
1337
1338 #ifndef OPENSSL_NO_ECDH
1339         else if (alg_k & SSL_kEECDH)
1340                 {
1341                 EC_GROUP *ngroup;
1342                 const EC_GROUP *group;
1343
1344                 if ((ecdh=EC_KEY_new()) == NULL)
1345                         {
1346                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1347                         goto err;
1348                         }
1349
1350                 /* Extract elliptic curve parameters and the
1351                  * server's ephemeral ECDH public key.
1352                  * Keep accumulating lengths of various components in
1353                  * param_len and make sure it never exceeds n.
1354                  */
1355
1356                 /* XXX: For now we only support named (not generic) curves
1357                  * and the ECParameters in this case is just three bytes.
1358                  */
1359                 param_len=3;
1360                 if ((param_len > n) ||
1361                     (*p != NAMED_CURVE_TYPE) ||
1362                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1363                         {
1364                         al=SSL_AD_INTERNAL_ERROR;
1365                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1366                         goto f_err;
1367                         }
1368
1369                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1370                 if (ngroup == NULL)
1371                         {
1372                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1373                         goto err;
1374                         }
1375                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1376                         {
1377                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1378                         goto err;
1379                         }
1380                 EC_GROUP_free(ngroup);
1381
1382                 group = EC_KEY_get0_group(ecdh);
1383
1384                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1385                     (EC_GROUP_get_degree(group) > 163))
1386                         {
1387                         al=SSL_AD_EXPORT_RESTRICTION;
1388                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1389                         goto f_err;
1390                         }
1391
1392                 p+=3;
1393
1394                 /* Next, get the encoded ECPoint */
1395                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1396                     ((bn_ctx = BN_CTX_new()) == NULL))
1397                         {
1398                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1399                         goto err;
1400                         }
1401
1402                 encoded_pt_len = *p;  /* length of encoded point */
1403                 p+=1;
1404                 param_len += (1 + encoded_pt_len);
1405                 if ((param_len > n) ||
1406                     (EC_POINT_oct2point(group, srvr_ecpoint,
1407                         p, encoded_pt_len, bn_ctx) == 0))
1408                         {
1409                         al=SSL_AD_DECODE_ERROR;
1410                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1411                         goto f_err;
1412                         }
1413
1414                 n-=param_len;
1415                 p+=encoded_pt_len;
1416
1417                 /* The ECC/TLS specification does not mention
1418                  * the use of DSA to sign ECParameters in the server
1419                  * key exchange message. We do support RSA and ECDSA.
1420                  */
1421                 if (0) ;
1422 #ifndef OPENSSL_NO_RSA
1423                 else if (alg_a & SSL_aRSA)
1424                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1425 #endif
1426 #ifndef OPENSSL_NO_ECDSA
1427                 else if (alg_a & SSL_aECDSA)
1428                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1429 #endif
1430                 /* else anonymous ECDH, so no certificate or pkey. */
1431                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1432                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1433                 ecdh=NULL;
1434                 BN_CTX_free(bn_ctx);
1435                 EC_POINT_free(srvr_ecpoint);
1436                 srvr_ecpoint = NULL;
1437                 }
1438         else if (alg_k)
1439                 {
1440                 al=SSL_AD_UNEXPECTED_MESSAGE;
1441                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1442                 goto f_err;
1443                 }
1444 #endif /* !OPENSSL_NO_ECDH */
1445
1446
1447         /* p points to the next byte, there are 'n' bytes left */
1448
1449         /* if it was signed, check the signature */
1450         if (pkey != NULL)
1451                 {
1452                 n2s(p,i);
1453                 n-=2;
1454                 j=EVP_PKEY_size(pkey);
1455
1456                 if ((i != n) || (n > j) || (n <= 0))
1457                         {
1458                         /* wrong packet length */
1459                         al=SSL_AD_DECODE_ERROR;
1460                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1461                         goto f_err;
1462                         }
1463
1464 #ifndef OPENSSL_NO_RSA
1465                 if (pkey->type == EVP_PKEY_RSA)
1466                         {
1467                         int num;
1468
1469                         j=0;
1470                         q=md_buf;
1471                         for (num=2; num > 0; num--)
1472                                 {
1473                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1474                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1475                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1476                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1477                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1478                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1479                                 q+=i;
1480                                 j+=i;
1481                                 }
1482                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1483                                                                 pkey->pkey.rsa);
1484                         if (i < 0)
1485                                 {
1486                                 al=SSL_AD_DECRYPT_ERROR;
1487                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1488                                 goto f_err;
1489                                 }
1490                         if (i == 0)
1491                                 {
1492                                 /* bad signature */
1493                                 al=SSL_AD_DECRYPT_ERROR;
1494                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1495                                 goto f_err;
1496                                 }
1497                         }
1498                 else
1499 #endif
1500 #ifndef OPENSSL_NO_DSA
1501                         if (pkey->type == EVP_PKEY_DSA)
1502                         {
1503                         /* lets do DSS */
1504                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1505                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1506                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1507                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1508                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1509                                 {
1510                                 /* bad signature */
1511                                 al=SSL_AD_DECRYPT_ERROR;
1512                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1513                                 goto f_err;
1514                                 }
1515                         }
1516                 else
1517 #endif
1518 #ifndef OPENSSL_NO_ECDSA
1519                         if (pkey->type == EVP_PKEY_EC)
1520                         {
1521                         /* let's do ECDSA */
1522                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1523                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1524                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1525                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1526                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1527                                 {
1528                                 /* bad signature */
1529                                 al=SSL_AD_DECRYPT_ERROR;
1530                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1531                                 goto f_err;
1532                                 }
1533                         }
1534                 else
1535 #endif
1536                         {
1537                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1538                         goto err;
1539                         }
1540                 }
1541         else
1542                 {
1543                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1544                         /* aNULL or kPSK do not need public keys */
1545                         {
1546                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1547                         goto err;
1548                         }
1549                 /* still data left over */
1550                 if (n != 0)
1551                         {
1552                         al=SSL_AD_DECODE_ERROR;
1553                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1554                         goto f_err;
1555                         }
1556                 }
1557         EVP_PKEY_free(pkey);
1558         EVP_MD_CTX_cleanup(&md_ctx);
1559         return(1);
1560 f_err:
1561         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1562 err:
1563         EVP_PKEY_free(pkey);
1564 #ifndef OPENSSL_NO_RSA
1565         if (rsa != NULL)
1566                 RSA_free(rsa);
1567 #endif
1568 #ifndef OPENSSL_NO_DH
1569         if (dh != NULL)
1570                 DH_free(dh);
1571 #endif
1572 #ifndef OPENSSL_NO_ECDH
1573         BN_CTX_free(bn_ctx);
1574         EC_POINT_free(srvr_ecpoint);
1575         if (ecdh != NULL)
1576                 EC_KEY_free(ecdh);
1577 #endif
1578         EVP_MD_CTX_cleanup(&md_ctx);
1579         return(-1);
1580         }
1581
1582 int ssl3_get_certificate_request(SSL *s)
1583         {
1584         int ok,ret=0;
1585         unsigned long n,nc,l;
1586         unsigned int llen,ctype_num,i;
1587         X509_NAME *xn=NULL;
1588         const unsigned char *p,*q;
1589         unsigned char *d;
1590         STACK_OF(X509_NAME) *ca_sk=NULL;
1591
1592         n=s->method->ssl_get_message(s,
1593                 SSL3_ST_CR_CERT_REQ_A,
1594                 SSL3_ST_CR_CERT_REQ_B,
1595                 -1,
1596                 s->max_cert_list,
1597                 &ok);
1598
1599         if (!ok) return((int)n);
1600
1601         s->s3->tmp.cert_req=0;
1602
1603         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1604                 {
1605                 s->s3->tmp.reuse_message=1;
1606                 return(1);
1607                 }
1608
1609         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1610                 {
1611                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1612                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1613                 goto err;
1614                 }
1615
1616         /* TLS does not like anon-DH with client cert */
1617         if (s->version > SSL3_VERSION)
1618                 {
1619                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1620                         {
1621                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1622                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1623                         goto err;
1624                         }
1625                 }
1626
1627         p=d=(unsigned char *)s->init_msg;
1628
1629         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1630                 {
1631                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1632                 goto err;
1633                 }
1634
1635         /* get the certificate types */
1636         ctype_num= *(p++);
1637         if (ctype_num > SSL3_CT_NUMBER)
1638                 ctype_num=SSL3_CT_NUMBER;
1639         for (i=0; i<ctype_num; i++)
1640                 s->s3->tmp.ctype[i]= p[i];
1641         p+=ctype_num;
1642
1643         /* get the CA RDNs */
1644         n2s(p,llen);
1645 #if 0
1646 {
1647 FILE *out;
1648 out=fopen("/tmp/vsign.der","w");
1649 fwrite(p,1,llen,out);
1650 fclose(out);
1651 }
1652 #endif
1653
1654         if ((llen+ctype_num+2+1) != n)
1655                 {
1656                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1657                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1658                 goto err;
1659                 }
1660
1661         for (nc=0; nc<llen; )
1662                 {
1663                 n2s(p,l);
1664                 if ((l+nc+2) > llen)
1665                         {
1666                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1667                                 goto cont; /* netscape bugs */
1668                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1669                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1670                         goto err;
1671                         }
1672
1673                 q=p;
1674
1675                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1676                         {
1677                         /* If netscape tolerance is on, ignore errors */
1678                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1679                                 goto cont;
1680                         else
1681                                 {
1682                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1683                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1684                                 goto err;
1685                                 }
1686                         }
1687
1688                 if (q != (p+l))
1689                         {
1690                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1691                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1692                         goto err;
1693                         }
1694                 if (!sk_X509_NAME_push(ca_sk,xn))
1695                         {
1696                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1697                         goto err;
1698                         }
1699
1700                 p+=l;
1701                 nc+=l+2;
1702                 }
1703
1704         if (0)
1705                 {
1706 cont:
1707                 ERR_clear_error();
1708                 }
1709
1710         /* we should setup a certificate to return.... */
1711         s->s3->tmp.cert_req=1;
1712         s->s3->tmp.ctype_num=ctype_num;
1713         if (s->s3->tmp.ca_names != NULL)
1714                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1715         s->s3->tmp.ca_names=ca_sk;
1716         ca_sk=NULL;
1717
1718         ret=1;
1719 err:
1720         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1721         return(ret);
1722         }
1723
1724 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1725         {
1726         return(X509_NAME_cmp(*a,*b));
1727         }
1728 #ifndef OPENSSL_NO_TLSEXT
1729 int ssl3_get_new_session_ticket(SSL *s)
1730         {
1731         int ok,al,ret=0, ticklen;
1732         long n;
1733         const unsigned char *p;
1734         unsigned char *d;
1735
1736         n=s->method->ssl_get_message(s,
1737                 SSL3_ST_CR_SESSION_TICKET_A,
1738                 SSL3_ST_CR_SESSION_TICKET_B,
1739                 -1,
1740                 16384,
1741                 &ok);
1742
1743         if (!ok)
1744                 return((int)n);
1745
1746         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1747                 {
1748                 s->s3->tmp.reuse_message=1;
1749                 return(1);
1750                 }
1751         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1752                 {
1753                 al=SSL_AD_UNEXPECTED_MESSAGE;
1754                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1755                 goto f_err;
1756                 }
1757         if (n < 6)
1758                 {
1759                 /* need at least ticket_lifetime_hint + ticket length */
1760                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1761                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1762                 goto f_err;
1763                 }
1764         p=d=(unsigned char *)s->init_msg;
1765         n2l(p, s->session->tlsext_tick_lifetime_hint);
1766         n2s(p, ticklen);
1767         /* ticket_lifetime_hint + ticket_length + ticket */
1768         if (ticklen + 6 != n)
1769                 {
1770                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1771                 SSLerr(SSL_F_SSL3_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1772                 goto f_err;
1773                 }
1774         if (s->session->tlsext_tick)
1775                 {
1776                 OPENSSL_free(s->session->tlsext_tick);
1777                 s->session->tlsext_ticklen = 0;
1778                 }
1779         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1780         if (!s->session->tlsext_tick)
1781                 {
1782                 SSLerr(SSL_F_SSL3_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1783                 goto err;
1784                 }
1785         memcpy(s->session->tlsext_tick, p, ticklen);
1786         s->session->tlsext_ticklen = ticklen;
1787
1788         ret=1;
1789         return(ret);
1790 f_err:
1791         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1792 err:
1793         return(-1);
1794         }
1795 #endif
1796
1797 int ssl3_get_server_done(SSL *s)
1798         {
1799         int ok,ret=0;
1800         long n;
1801
1802         n=s->method->ssl_get_message(s,
1803                 SSL3_ST_CR_SRVR_DONE_A,
1804                 SSL3_ST_CR_SRVR_DONE_B,
1805                 SSL3_MT_SERVER_DONE,
1806                 30, /* should be very small, like 0 :-) */
1807                 &ok);
1808
1809         if (!ok) return((int)n);
1810         if (n > 0)
1811                 {
1812                 /* should contain no data */
1813                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1814                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1815                 return -1;
1816                 }
1817         ret=1;
1818         return(ret);
1819         }
1820
1821
1822 int ssl3_send_client_key_exchange(SSL *s)
1823         {
1824         unsigned char *p,*d;
1825         int n;
1826         unsigned long alg_k;
1827 #ifndef OPENSSL_NO_RSA
1828         unsigned char *q;
1829         EVP_PKEY *pkey=NULL;
1830 #endif
1831 #ifndef OPENSSL_NO_KRB5
1832         KSSL_ERR kssl_err;
1833 #endif /* OPENSSL_NO_KRB5 */
1834 #ifndef OPENSSL_NO_ECDH
1835         EC_KEY *clnt_ecdh = NULL;
1836         const EC_POINT *srvr_ecpoint = NULL;
1837         EVP_PKEY *srvr_pub_pkey = NULL;
1838         unsigned char *encodedPoint = NULL;
1839         int encoded_pt_len = 0;
1840         BN_CTX * bn_ctx = NULL;
1841 #endif
1842
1843         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1844                 {
1845                 d=(unsigned char *)s->init_buf->data;
1846                 p= &(d[4]);
1847
1848                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1849
1850                 /* Fool emacs indentation */
1851                 if (0) {}
1852 #ifndef OPENSSL_NO_RSA
1853                 else if (alg_k & SSL_kRSA)
1854                         {
1855                         RSA *rsa;
1856                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1857
1858                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1859                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1860                         else
1861                                 {
1862                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1863                                 if ((pkey == NULL) ||
1864                                         (pkey->type != EVP_PKEY_RSA) ||
1865                                         (pkey->pkey.rsa == NULL))
1866                                         {
1867                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1868                                         goto err;
1869                                         }
1870                                 rsa=pkey->pkey.rsa;
1871                                 EVP_PKEY_free(pkey);
1872                                 }
1873
1874                         tmp_buf[0]=s->client_version>>8;
1875                         tmp_buf[1]=s->client_version&0xff;
1876                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1877                                         goto err;
1878
1879                         s->session->master_key_length=sizeof tmp_buf;
1880
1881                         q=p;
1882                         /* Fix buf for TLS and beyond */
1883                         if (s->version > SSL3_VERSION)
1884                                 p+=2;
1885                         n=RSA_public_encrypt(sizeof tmp_buf,
1886                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1887 #ifdef PKCS1_CHECK
1888                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1889                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1890 #endif
1891                         if (n <= 0)
1892                                 {
1893                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1894                                 goto err;
1895                                 }
1896
1897                         /* Fix buf for TLS and beyond */
1898                         if (s->version > SSL3_VERSION)
1899                                 {
1900                                 s2n(n,q);
1901                                 n+=2;
1902                                 }
1903
1904                         s->session->master_key_length=
1905                                 s->method->ssl3_enc->generate_master_secret(s,
1906                                         s->session->master_key,
1907                                         tmp_buf,sizeof tmp_buf);
1908                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1909                         }
1910 #endif
1911 #ifndef OPENSSL_NO_KRB5
1912                 else if (alg_k & SSL_kKRB5)
1913                         {
1914                         krb5_error_code krb5rc;
1915                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1916                         /*  krb5_data   krb5_ap_req;  */
1917                         krb5_data       *enc_ticket;
1918                         krb5_data       authenticator, *authp = NULL;
1919                         EVP_CIPHER_CTX  ciph_ctx;
1920                         EVP_CIPHER      *enc = NULL;
1921                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1922                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1923                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1924                                                 + EVP_MAX_IV_LENGTH];
1925                         int             padl, outl = sizeof(epms);
1926
1927                         EVP_CIPHER_CTX_init(&ciph_ctx);
1928
1929 #ifdef KSSL_DEBUG
1930                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1931                                 alg_k, SSL_kKRB5);
1932 #endif  /* KSSL_DEBUG */
1933
1934                         authp = NULL;
1935 #ifdef KRB5SENDAUTH
1936                         if (KRB5SENDAUTH)  authp = &authenticator;
1937 #endif  /* KRB5SENDAUTH */
1938
1939                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1940                                 &kssl_err);
1941                         enc = kssl_map_enc(kssl_ctx->enctype);
1942                         if (enc == NULL)
1943                             goto err;
1944 #ifdef KSSL_DEBUG
1945                         {
1946                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1947                         if (krb5rc && kssl_err.text)
1948                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1949                         }
1950 #endif  /* KSSL_DEBUG */
1951
1952                         if (krb5rc)
1953                                 {
1954                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1955                                                 SSL_AD_HANDSHAKE_FAILURE);
1956                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1957                                                 kssl_err.reason);
1958                                 goto err;
1959                                 }
1960
1961                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1962                         **  in place of RFC 2712 KerberosWrapper, as in:
1963                         **
1964                         **  Send ticket (copy to *p, set n = length)
1965                         **  n = krb5_ap_req.length;
1966                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1967                         **  if (krb5_ap_req.data)
1968                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1969                         **
1970                         **  Now using real RFC 2712 KerberosWrapper
1971                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1972                         **  Note: 2712 "opaque" types are here replaced
1973                         **  with a 2-byte length followed by the value.
1974                         **  Example:
1975                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1976                         **  Where "xx xx" = length bytes.  Shown here with
1977                         **  optional authenticator omitted.
1978                         */
1979
1980                         /*  KerberosWrapper.Ticket              */
1981                         s2n(enc_ticket->length,p);
1982                         memcpy(p, enc_ticket->data, enc_ticket->length);
1983                         p+= enc_ticket->length;
1984                         n = enc_ticket->length + 2;
1985
1986                         /*  KerberosWrapper.Authenticator       */
1987                         if (authp  &&  authp->length)
1988                                 {
1989                                 s2n(authp->length,p);
1990                                 memcpy(p, authp->data, authp->length);
1991                                 p+= authp->length;
1992                                 n+= authp->length + 2;
1993
1994                                 free(authp->data);
1995                                 authp->data = NULL;
1996                                 authp->length = 0;
1997                                 }
1998                         else
1999                                 {
2000                                 s2n(0,p);/*  null authenticator length  */
2001                                 n+=2;
2002                                 }
2003
2004                             tmp_buf[0]=s->client_version>>8;
2005                             tmp_buf[1]=s->client_version&0xff;
2006                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2007                                 goto err;
2008
2009                         /*  20010420 VRS.  Tried it this way; failed.
2010                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2011                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2012                         **                              kssl_ctx->length);
2013                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2014                         */
2015
2016                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2017                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2018                                 kssl_ctx->key,iv);
2019                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2020                                 sizeof tmp_buf);
2021                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2022                         outl += padl;
2023                         if (outl > sizeof epms)
2024                                 {
2025                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2026                                 goto err;
2027                                 }
2028                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2029
2030                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2031                         s2n(outl,p);
2032                         memcpy(p, epms, outl);
2033                         p+=outl;
2034                         n+=outl + 2;
2035
2036                         s->session->master_key_length=
2037                                 s->method->ssl3_enc->generate_master_secret(s,
2038                                         s->session->master_key,
2039                                         tmp_buf, sizeof tmp_buf);
2040
2041                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2042                         OPENSSL_cleanse(epms, outl);
2043                         }
2044 #endif
2045 #ifndef OPENSSL_NO_DH
2046                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2047                         {
2048                         DH *dh_srvr,*dh_clnt;
2049
2050                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2051                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2052                         else
2053                                 {
2054                                 /* we get them from the cert */
2055                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2056                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2057                                 goto err;
2058                                 }
2059
2060                         /* generate a new random key */
2061                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2062                                 {
2063                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2064                                 goto err;
2065                                 }
2066                         if (!DH_generate_key(dh_clnt))
2067                                 {
2068                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2069                                 goto err;
2070                                 }
2071
2072                         /* use the 'p' output buffer for the DH key, but
2073                          * make sure to clear it out afterwards */
2074
2075                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2076
2077                         if (n <= 0)
2078                                 {
2079                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2080                                 goto err;
2081                                 }
2082
2083                         /* generate master key from the result */
2084                         s->session->master_key_length=
2085                                 s->method->ssl3_enc->generate_master_secret(s,
2086                                         s->session->master_key,p,n);
2087                         /* clean up */
2088                         memset(p,0,n);
2089
2090                         /* send off the data */
2091                         n=BN_num_bytes(dh_clnt->pub_key);
2092                         s2n(n,p);
2093                         BN_bn2bin(dh_clnt->pub_key,p);
2094                         n+=2;
2095
2096                         DH_free(dh_clnt);
2097
2098                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2099                         }
2100 #endif
2101
2102 #ifndef OPENSSL_NO_ECDH
2103                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2104                         {
2105                         const EC_GROUP *srvr_group = NULL;
2106                         EC_KEY *tkey;
2107                         int ecdh_clnt_cert = 0;
2108                         int field_size = 0;
2109
2110                         /* Did we send out the client's
2111                          * ECDH share for use in premaster
2112                          * computation as part of client certificate?
2113                          * If so, set ecdh_clnt_cert to 1.
2114                          */
2115                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2116                                 {
2117                                 /* XXX: For now, we do not support client
2118                                  * authentication using ECDH certificates.
2119                                  * To add such support, one needs to add
2120                                  * code that checks for appropriate
2121                                  * conditions and sets ecdh_clnt_cert to 1.
2122                                  * For example, the cert have an ECC
2123                                  * key on the same curve as the server's
2124                                  * and the key should be authorized for
2125                                  * key agreement.
2126                                  *
2127                                  * One also needs to add code in ssl3_connect
2128                                  * to skip sending the certificate verify
2129                                  * message.
2130                                  *
2131                                  * if ((s->cert->key->privatekey != NULL) &&
2132                                  *     (s->cert->key->privatekey->type ==
2133                                  *      EVP_PKEY_EC) && ...)
2134                                  * ecdh_clnt_cert = 1;
2135                                  */
2136                                 }
2137
2138                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2139                                 {
2140                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2141                                 }
2142                         else
2143                                 {
2144                                 /* Get the Server Public Key from Cert */
2145                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2146                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2147                                 if ((srvr_pub_pkey == NULL) ||
2148                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2149                                     (srvr_pub_pkey->pkey.ec == NULL))
2150                                         {
2151                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2152                                             ERR_R_INTERNAL_ERROR);
2153                                         goto err;
2154                                         }
2155
2156                                 tkey = srvr_pub_pkey->pkey.ec;
2157                                 }
2158
2159                         srvr_group   = EC_KEY_get0_group(tkey);
2160                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2161
2162                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2163                                 {
2164                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2165                                     ERR_R_INTERNAL_ERROR);
2166                                 goto err;
2167                                 }
2168
2169                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2170                                 {
2171                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2172                                 goto err;
2173                                 }
2174
2175                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2176                                 {
2177                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2178                                 goto err;
2179                                 }
2180                         if (ecdh_clnt_cert)
2181                                 {
2182                                 /* Reuse key info from our certificate
2183                                  * We only need our private key to perform
2184                                  * the ECDH computation.
2185                                  */
2186                                 const BIGNUM *priv_key;
2187                                 tkey = s->cert->key->privatekey->pkey.ec;
2188                                 priv_key = EC_KEY_get0_private_key(tkey);
2189                                 if (priv_key == NULL)
2190                                         {
2191                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2192                                         goto err;
2193                                         }
2194                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2195                                         {
2196                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2197                                         goto err;
2198                                         }
2199                                 }
2200                         else
2201                                 {
2202                                 /* Generate a new ECDH key pair */
2203                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2204                                         {
2205                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2206                                         goto err;
2207                                         }
2208                                 }
2209
2210                         /* use the 'p' output buffer for the ECDH key, but
2211                          * make sure to clear it out afterwards
2212                          */
2213
2214                         field_size = EC_GROUP_get_degree(srvr_group);
2215                         if (field_size <= 0)
2216                                 {
2217                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2218                                        ERR_R_ECDH_LIB);
2219                                 goto err;
2220                                 }
2221                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2222                         if (n <= 0)
2223                                 {
2224                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2225                                        ERR_R_ECDH_LIB);
2226                                 goto err;
2227                                 }
2228
2229                         /* generate master key from the result */
2230                         s->session->master_key_length = s->method->ssl3_enc \
2231                             -> generate_master_secret(s,
2232                                 s->session->master_key,
2233                                 p, n);
2234
2235                         memset(p, 0, n); /* clean up */
2236
2237                         if (ecdh_clnt_cert)
2238                                 {
2239                                 /* Send empty client key exch message */
2240                                 n = 0;
2241                                 }
2242                         else
2243                                 {
2244                                 /* First check the size of encoding and
2245                                  * allocate memory accordingly.
2246                                  */
2247                                 encoded_pt_len =
2248                                     EC_POINT_point2oct(srvr_group,
2249                                         EC_KEY_get0_public_key(clnt_ecdh),
2250                                         POINT_CONVERSION_UNCOMPRESSED,
2251                                         NULL, 0, NULL);
2252
2253                                 encodedPoint = (unsigned char *)
2254                                     OPENSSL_malloc(encoded_pt_len *
2255                                         sizeof(unsigned char));
2256                                 bn_ctx = BN_CTX_new();
2257                                 if ((encodedPoint == NULL) ||
2258                                     (bn_ctx == NULL))
2259                                         {
2260                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2261                                         goto err;
2262                                         }
2263
2264                                 /* Encode the public key */
2265                                 n = EC_POINT_point2oct(srvr_group,
2266                                     EC_KEY_get0_public_key(clnt_ecdh),
2267                                     POINT_CONVERSION_UNCOMPRESSED,
2268                                     encodedPoint, encoded_pt_len, bn_ctx);
2269
2270                                 *p = n; /* length of encoded point */
2271                                 /* Encoded point will be copied here */
2272                                 p += 1;
2273                                 /* copy the point */
2274                                 memcpy((unsigned char *)p, encodedPoint, n);
2275                                 /* increment n to account for length field */
2276                                 n += 1;
2277                                 }
2278
2279                         /* Free allocated memory */
2280                         BN_CTX_free(bn_ctx);
2281                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2282                         if (clnt_ecdh != NULL)
2283                                  EC_KEY_free(clnt_ecdh);
2284                         EVP_PKEY_free(srvr_pub_pkey);
2285                         }
2286 #endif /* !OPENSSL_NO_ECDH */
2287 #ifndef OPENSSL_NO_PSK
2288                 else if (alg_k & SSL_kPSK)
2289                         {
2290                         char identity[PSK_MAX_IDENTITY_LEN];
2291                         unsigned char *t = NULL;
2292                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2293                         unsigned int pre_ms_len = 0, psk_len = 0;
2294                         int psk_err = 1;
2295
2296                         n = 0;
2297                         if (s->psk_client_callback == NULL)
2298                                 {
2299                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2300                                         SSL_R_PSK_NO_CLIENT_CB);
2301                                 goto err;
2302                                 }
2303
2304                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2305                                 identity, PSK_MAX_IDENTITY_LEN,
2306                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2307                         if (psk_len > PSK_MAX_PSK_LEN)
2308                                 {
2309                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2310                                         ERR_R_INTERNAL_ERROR);
2311                                 goto psk_err;
2312                                 }
2313                         else if (psk_len == 0)
2314                                 {
2315                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2316                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2317                                 goto psk_err;
2318                                 }
2319
2320                         /* create PSK pre_master_secret */
2321                         pre_ms_len = 2+psk_len+2+psk_len;
2322                         t = psk_or_pre_ms;
2323                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2324                         s2n(psk_len, t);
2325                         memset(t, 0, psk_len);
2326                         t+=psk_len;
2327                         s2n(psk_len, t);
2328
2329                         if (s->session->psk_identity_hint != NULL)
2330                                 OPENSSL_free(s->session->psk_identity_hint);
2331                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2332                         if (s->ctx->psk_identity_hint != NULL &&
2333                                 s->session->psk_identity_hint == NULL)
2334                                 {
2335                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2336                                         ERR_R_MALLOC_FAILURE);
2337                                 goto psk_err;
2338                                 }
2339
2340                         if (s->session->psk_identity != NULL)
2341                                 OPENSSL_free(s->session->psk_identity);
2342                         s->session->psk_identity = BUF_strdup(identity);
2343                         if (s->session->psk_identity == NULL)
2344                                 {
2345                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2346                                         ERR_R_MALLOC_FAILURE);
2347                                 goto psk_err;
2348                                 }
2349
2350                         s->session->master_key_length =
2351                                 s->method->ssl3_enc->generate_master_secret(s,
2352                                         s->session->master_key,
2353                                         psk_or_pre_ms, pre_ms_len);
2354                         n = strlen(identity);
2355                         s2n(n, p);
2356                         memcpy(p, identity, n);
2357                         n+=2;
2358                         psk_err = 0;
2359                 psk_err:
2360                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2361                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2362                         if (psk_err != 0)
2363                                 {
2364                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2365                                 goto err;
2366                                 }
2367                         }
2368 #endif
2369                 else
2370                         {
2371                         ssl3_send_alert(s, SSL3_AL_FATAL,
2372                             SSL_AD_HANDSHAKE_FAILURE);
2373                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2374                             ERR_R_INTERNAL_ERROR);
2375                         goto err;
2376                         }
2377
2378                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2379                 l2n3(n,d);
2380
2381                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2382                 /* number of bytes to write */
2383                 s->init_num=n+4;
2384                 s->init_off=0;
2385                 }
2386
2387         /* SSL3_ST_CW_KEY_EXCH_B */
2388         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2389 err:
2390 #ifndef OPENSSL_NO_ECDH
2391         BN_CTX_free(bn_ctx);
2392         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2393         if (clnt_ecdh != NULL)
2394                 EC_KEY_free(clnt_ecdh);
2395         EVP_PKEY_free(srvr_pub_pkey);
2396 #endif
2397         return(-1);
2398         }
2399
2400 int ssl3_send_client_verify(SSL *s)
2401         {
2402         unsigned char *p,*d;
2403         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2404         EVP_PKEY *pkey;
2405 #ifndef OPENSSL_NO_RSA
2406         unsigned u=0;
2407 #endif
2408         unsigned long n;
2409 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2410         int j;
2411 #endif
2412
2413         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2414                 {
2415                 d=(unsigned char *)s->init_buf->data;
2416                 p= &(d[4]);
2417                 pkey=s->cert->key->privatekey;
2418
2419                 s->method->ssl3_enc->cert_verify_mac(s,
2420                         NID_sha1,
2421                         &(data[MD5_DIGEST_LENGTH]));
2422
2423 #ifndef OPENSSL_NO_RSA
2424                 if (pkey->type == EVP_PKEY_RSA)
2425                         {
2426                         s->method->ssl3_enc->cert_verify_mac(s,
2427                                 NID_md5,
2428                                 &(data[0]));
2429                         if (RSA_sign(NID_md5_sha1, data,
2430                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2431                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2432                                 {
2433                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2434                                 goto err;
2435                                 }
2436                         s2n(u,p);
2437                         n=u+2;
2438                         }
2439                 else
2440 #endif
2441 #ifndef OPENSSL_NO_DSA
2442                         if (pkey->type == EVP_PKEY_DSA)
2443                         {
2444                         if (!DSA_sign(pkey->save_type,
2445                                 &(data[MD5_DIGEST_LENGTH]),
2446                                 SHA_DIGEST_LENGTH,&(p[2]),
2447                                 (unsigned int *)&j,pkey->pkey.dsa))
2448                                 {
2449                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2450                                 goto err;
2451                                 }
2452                         s2n(j,p);
2453                         n=j+2;
2454                         }
2455                 else
2456 #endif
2457 #ifndef OPENSSL_NO_ECDSA
2458                         if (pkey->type == EVP_PKEY_EC)
2459                         {
2460                         if (!ECDSA_sign(pkey->save_type,
2461                                 &(data[MD5_DIGEST_LENGTH]),
2462                                 SHA_DIGEST_LENGTH,&(p[2]),
2463                                 (unsigned int *)&j,pkey->pkey.ec))
2464                                 {
2465                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2466                                     ERR_R_ECDSA_LIB);
2467                                 goto err;
2468                                 }
2469                         s2n(j,p);
2470                         n=j+2;
2471                         }
2472                 else
2473 #endif
2474                         {
2475                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2476                         goto err;
2477                         }
2478                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2479                 l2n3(n,d);
2480
2481                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2482                 s->init_num=(int)n+4;
2483                 s->init_off=0;
2484                 }
2485         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2486 err:
2487         return(-1);
2488         }
2489
2490 int ssl3_send_client_certificate(SSL *s)
2491         {
2492         X509 *x509=NULL;
2493         EVP_PKEY *pkey=NULL;
2494         int i;
2495         unsigned long l;
2496
2497         if (s->state == SSL3_ST_CW_CERT_A)
2498                 {
2499                 if ((s->cert == NULL) ||
2500                         (s->cert->key->x509 == NULL) ||
2501                         (s->cert->key->privatekey == NULL))
2502                         s->state=SSL3_ST_CW_CERT_B;
2503                 else
2504                         s->state=SSL3_ST_CW_CERT_C;
2505                 }
2506
2507         /* We need to get a client cert */
2508         if (s->state == SSL3_ST_CW_CERT_B)
2509                 {
2510                 /* If we get an error, we need to
2511                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2512                  * We then get retied later */
2513                 i=0;
2514                 if (s->ctx->client_cert_cb != NULL)
2515                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2516                 if (i < 0)
2517                         {
2518                         s->rwstate=SSL_X509_LOOKUP;
2519                         return(-1);
2520                         }
2521                 s->rwstate=SSL_NOTHING;
2522                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2523                         {
2524                         s->state=SSL3_ST_CW_CERT_B;
2525                         if (    !SSL_use_certificate(s,x509) ||
2526                                 !SSL_use_PrivateKey(s,pkey))
2527                                 i=0;
2528                         }
2529                 else if (i == 1)
2530                         {
2531                         i=0;
2532                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2533                         }
2534
2535                 if (x509 != NULL) X509_free(x509);
2536                 if (pkey != NULL) EVP_PKEY_free(pkey);
2537                 if (i == 0)
2538                         {
2539                         if (s->version == SSL3_VERSION)
2540                                 {
2541                                 s->s3->tmp.cert_req=0;
2542                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2543                                 return(1);
2544                                 }
2545                         else
2546                                 {
2547                                 s->s3->tmp.cert_req=2;
2548                                 }
2549                         }
2550
2551                 /* Ok, we have a cert */
2552                 s->state=SSL3_ST_CW_CERT_C;
2553                 }
2554
2555         if (s->state == SSL3_ST_CW_CERT_C)
2556                 {
2557                 s->state=SSL3_ST_CW_CERT_D;
2558                 l=ssl3_output_cert_chain(s,
2559                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2560                 s->init_num=(int)l;
2561                 s->init_off=0;
2562                 }
2563         /* SSL3_ST_CW_CERT_D */
2564         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2565         }
2566
2567 #define has_bits(i,m)   (((i)&(m)) == (m))
2568
2569 int ssl3_check_cert_and_algorithm(SSL *s)
2570         {
2571         int i,idx;
2572         long alg_k,alg_a;
2573         EVP_PKEY *pkey=NULL;
2574         SESS_CERT *sc;
2575 #ifndef OPENSSL_NO_RSA
2576         RSA *rsa;
2577 #endif
2578 #ifndef OPENSSL_NO_DH
2579         DH *dh;
2580 #endif
2581
2582         sc=s->session->sess_cert;
2583         if (sc == NULL)
2584                 {
2585                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2586                 goto err;
2587                 }
2588
2589         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2590         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
2591
2592         /* we don't have a certificate */
2593         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
2594                 return(1);
2595
2596 #ifndef OPENSSL_NO_RSA
2597         rsa=s->session->sess_cert->peer_rsa_tmp;
2598 #endif
2599 #ifndef OPENSSL_NO_DH
2600         dh=s->session->sess_cert->peer_dh_tmp;
2601 #endif
2602
2603         /* This is the passed certificate */
2604
2605         idx=sc->peer_cert_type;
2606 #ifndef OPENSSL_NO_ECDH
2607         if (idx == SSL_PKEY_ECC)
2608                 {
2609                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2610                     s->s3->tmp.new_cipher) == 0)
2611                         { /* check failed */
2612                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2613                         goto f_err;
2614                         }
2615                 else
2616                         {
2617                         return 1;
2618                         }
2619                 }
2620 #endif
2621         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2622         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2623         EVP_PKEY_free(pkey);
2624
2625
2626         /* Check that we have a certificate if we require one */
2627         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2628                 {
2629                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2630                 goto f_err;
2631                 }
2632 #ifndef OPENSSL_NO_DSA
2633         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2634                 {
2635                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2636                 goto f_err;
2637                 }
2638 #endif
2639 #ifndef OPENSSL_NO_RSA
2640         if ((alg_k & SSL_kRSA) &&
2641                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2642                 {
2643                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2644                 goto f_err;
2645                 }
2646 #endif
2647 #ifndef OPENSSL_NO_DH
2648         if ((alg_k & SSL_kEDH) &&
2649                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2650                 {
2651                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2652                 goto f_err;
2653                 }
2654         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2655                 {
2656                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2657                 goto f_err;
2658                 }
2659 #ifndef OPENSSL_NO_DSA
2660         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2661                 {
2662                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2663                 goto f_err;
2664                 }
2665 #endif
2666 #endif
2667
2668         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2669                 {
2670 #ifndef OPENSSL_NO_RSA
2671                 if (alg_k & SSL_kRSA)
2672                         {
2673                         if (rsa == NULL
2674                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2675                                 {
2676                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2677                                 goto f_err;
2678                                 }
2679                         }
2680                 else
2681 #endif
2682 #ifndef OPENSSL_NO_DH
2683                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2684                             {
2685                             if (dh == NULL
2686                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2687                                 {
2688                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2689                                 goto f_err;
2690                                 }
2691                         }
2692                 else
2693 #endif
2694                         {
2695                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2696                         goto f_err;
2697                         }
2698                 }
2699         return(1);
2700 f_err:
2701         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2702 err:
2703         return(0);
2704         }
2705
2706 /* Check to see if handshake is full or resumed. Usually this is just a
2707  * case of checking to see if a cache hit has occurred. In the case of
2708  * session tickets we have to check the next message to be sure.
2709  */
2710
2711 #ifndef OPENSSL_NO_TLSEXT
2712 static int ssl3_check_finished(SSL *s)
2713         {
2714         int ok;
2715         long n;
2716         if (!s->session->tlsext_tick)
2717                 return 1;
2718         /* this function is called when we really expect a Certificate
2719          * message, so permit appropriate message length */
2720         n=s->method->ssl_get_message(s,
2721                 SSL3_ST_CR_CERT_A,
2722                 SSL3_ST_CR_CERT_B,
2723                 -1,
2724                 s->max_cert_list,
2725                 &ok);
2726         if (!ok) return((int)n);
2727         s->s3->tmp.reuse_message = 1;
2728         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
2729                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2730                 return 2;
2731
2732         return 1;
2733         }
2734 #endif