ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * 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  * In addition, Sun covenants to all licensees who provide a reciprocal
 121  * covenant with respect to their own patents if any, not to sue under
 122  * current and future patent claims necessarily infringed by the making,
 123  * using, practicing, selling, offering for sale and/or otherwise
 124  * disposing of the Contribution as delivered hereunder
 125  * (or portions thereof), provided that such covenant shall not apply:
 126  *  1) for code that a licensee deletes from the Contribution;
 127  *  2) separates from the Contribution; or
 128  *  3) for infringements caused by:
 129  *       i) the modification of the Contribution or
 130  *      ii) the combination of the  Contribution with other software or
 131  *          devices where such combination causes the infringement.
 132  *
 133  * ECC cipher suite support in OpenSSL originally written by
 134  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 135  *
 136  */
 137
 138 #define REUSE_CIPHER_BUG
 139 #define NETSCAPE_HANG_BUG
 140
 141 #include <stdio.h>
 142 #include "ssl_locl.h"
 143 #include "kssl_lcl.h"
 144 #include <openssl/buffer.h>
 145 #include <openssl/rand.h>
 146 #include <openssl/objects.h>
 147 #include <openssl/evp.h>
 148 #include <openssl/x509.h>
 149 #include <openssl/krb5_asn.h>
 150 #include <openssl/md5.h>
 151 #include "cryptlib.h"
 152
 153 static SSL_METHOD *ssl3_get_server_method(int ver);
 154 static int ssl3_get_client_hello(SSL *s);
 155 static int ssl3_check_client_hello(SSL *s);
 156 static int ssl3_send_server_hello(SSL *s);
 157 static int ssl3_send_server_key_exchange(SSL *s);
 158 static int ssl3_send_certificate_request(SSL *s);
 159 static int ssl3_send_server_done(SSL *s);
 160 static int ssl3_get_client_key_exchange(SSL *s);
 161 static int ssl3_get_client_certificate(SSL *s);
 162 static int ssl3_get_cert_verify(SSL *s);
 163 static int ssl3_send_hello_request(SSL *s);
 164
 165 #ifndef OPENSSL_NO_ECDH
 166 static int nid2curve_id(int nid);
 167 #endif
 168
 169 static SSL_METHOD *ssl3_get_server_method(int ver)
 170         {
 171         if (ver == SSL3_VERSION)
 172                 return(SSLv3_server_method());
 173         else
 174                 return(NULL);
 175         }
 176
 177 SSL_METHOD *SSLv3_server_method(void)
 178         {
 179         static int init=1;
 180         static SSL_METHOD SSLv3_server_data;
 181
 182         if (init)
 183                 {
 184                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 185
 186                 if (init)
 187                         {
 188                         memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 189                                 sizeof(SSL_METHOD));
 190                         SSLv3_server_data.ssl_accept=ssl3_accept;
 191                         SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 192                         init=0;
 193                         }
 194
 195                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 196                 }
 197         return(&SSLv3_server_data);
 198         }
 199
 200 int ssl3_accept(SSL *s)
 201         {
 202         BUF_MEM *buf;
 203         unsigned long l,Time=time(NULL);
 204         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 205         long num1;
 206         int ret= -1;
 207         int new_state,state,skip=0;
 208
 209         RAND_add(&Time,sizeof(Time),0);
 210         ERR_clear_error();
 211         clear_sys_error();
 212
 213         if (s->info_callback != NULL)
 214                 cb=s->info_callback;
 215         else if (s->ctx->info_callback != NULL)
 216                 cb=s->ctx->info_callback;
 217
 218         /* init things to blank */
 219         s->in_handshake++;
 220         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 221
 222         if (s->cert == NULL)
 223                 {
 224                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 225                 return(-1);
 226                 }
 227
 228         for (;;)
 229                 {
 230                 state=s->state;
 231
 232                 switch (s->state)
 233                         {
 234                 case SSL_ST_RENEGOTIATE:
 235                         s->new_session=1;
 236                         /* s->state=SSL_ST_ACCEPT; */
 237
 238                 case SSL_ST_BEFORE:
 239                 case SSL_ST_ACCEPT:
 240                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 241                 case SSL_ST_OK|SSL_ST_ACCEPT:
 242
 243                         s->server=1;
 244                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 245
 246                         if ((s->version>>8) != 3)
 247                                 {
 248                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 249                                 return -1;
 250                                 }
 251                         s->type=SSL_ST_ACCEPT;
 252
 253                         if (s->init_buf == NULL)
 254                                 {
 255                                 if ((buf=BUF_MEM_new()) == NULL)
 256                                         {
 257                                         ret= -1;
 258                                         goto end;
 259                                         }
 260                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 261                                         {
 262                                         ret= -1;
 263                                         goto end;
 264                                         }
 265                                 s->init_buf=buf;
 266                                 }
 267
 268                         if (!ssl3_setup_buffers(s))
 269                                 {
 270                                 ret= -1;
 271                                 goto end;
 272                                 }
 273
 274                         s->init_num=0;
 275
 276                         if (s->state != SSL_ST_RENEGOTIATE)
 277                                 {
 278                                 /* Ok, we now need to push on a buffering BIO so that
 279                                  * the output is sent in a way that TCP likes :-)
 280                                  */
 281                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 282
 283                                 ssl3_init_finished_mac(s);
 284                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 285                                 s->ctx->stats.sess_accept++;
 286                                 }
 287                         else
 288                                 {
 289                                 /* s->state == SSL_ST_RENEGOTIATE,
 290                                  * we will just send a HelloRequest */
 291                                 s->ctx->stats.sess_accept_renegotiate++;
 292                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 293                                 }
 294                         break;
 295
 296                 case SSL3_ST_SW_HELLO_REQ_A:
 297                 case SSL3_ST_SW_HELLO_REQ_B:
 298
 299                         s->shutdown=0;
 300                         ret=ssl3_send_hello_request(s);
 301                         if (ret <= 0) goto end;
 302                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 303                         s->state=SSL3_ST_SW_FLUSH;
 304                         s->init_num=0;
 305
 306                         ssl3_init_finished_mac(s);
 307                         break;
 308
 309                 case SSL3_ST_SW_HELLO_REQ_C:
 310                         s->state=SSL_ST_OK;
 311                         break;
 312
 313                 case SSL3_ST_SR_CLNT_HELLO_A:
 314                 case SSL3_ST_SR_CLNT_HELLO_B:
 315                 case SSL3_ST_SR_CLNT_HELLO_C:
 316
 317                         s->shutdown=0;
 318                         ret=ssl3_get_client_hello(s);
 319                         if (ret <= 0) goto end;
 320                         s->new_session = 2;
 321                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 322                         s->init_num=0;
 323                         break;
 324
 325                 case SSL3_ST_SW_SRVR_HELLO_A:
 326                 case SSL3_ST_SW_SRVR_HELLO_B:
 327                         ret=ssl3_send_server_hello(s);
 328                         if (ret <= 0) goto end;
 329
 330                         if (s->hit)
 331                                 s->state=SSL3_ST_SW_CHANGE_A;
 332                         else
 333                                 s->state=SSL3_ST_SW_CERT_A;
 334                         s->init_num=0;
 335                         break;
 336
 337                 case SSL3_ST_SW_CERT_A:
 338                 case SSL3_ST_SW_CERT_B:
 339                         /* Check if it is anon DH or anon ECDH */
 340                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 341                                 {
 342                                 ret=ssl3_send_server_certificate(s);
 343                                 if (ret <= 0) goto end;
 344                                 }
 345                         else
 346                                 skip=1;
 347                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 348                         s->init_num=0;
 349                         break;
 350
 351                 case SSL3_ST_SW_KEY_EXCH_A:
 352                 case SSL3_ST_SW_KEY_EXCH_B:
 353                         l=s->s3->tmp.new_cipher->algorithms;
 354
 355                         /* clear this, it may get reset by
 356                          * send_server_key_exchange */
 357                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 358 #ifndef OPENSSL_NO_KRB5
 359                                 && !(l & SSL_KRB5)
 360 #endif /* OPENSSL_NO_KRB5 */
 361                                 )
 362                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 363                                  * even when forbidden by protocol specs
 364                                  * (handshake may fail as clients are not required to
 365                                  * be able to handle this) */
 366                                 s->s3->tmp.use_rsa_tmp=1;
 367                         else
 368                                 s->s3->tmp.use_rsa_tmp=0;
 369
 370
 371                         /* only send if a DH key exchange, fortezza or
 372                          * RSA but we have a sign only certificate
 373                          *
 374                          * For ECC ciphersuites, we send a serverKeyExchange
 375                          * message only if the cipher suite is either
 376                          * ECDH-anon or ECDHE. In other cases, the
 377                          * server certificate contains the server's
 378                          * public key for key exchange.
 379                          */
 380                         if (s->s3->tmp.use_rsa_tmp
 381                             || (l & SSL_kECDHE)
 382                             || (l & (SSL_DH|SSL_kFZA))
 383                             || ((l & SSL_kRSA)
 384                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 385                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 386                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 387                                         )
 388                                     )
 389                                 )
 390                             )
 391                                 {
 392                                 ret=ssl3_send_server_key_exchange(s);
 393                                 if (ret <= 0) goto end;
 394                                 }
 395                         else
 396                                 skip=1;
 397
 398                         s->state=SSL3_ST_SW_CERT_REQ_A;
 399                         s->init_num=0;
 400                         break;
 401
 402                 case SSL3_ST_SW_CERT_REQ_A:
 403                 case SSL3_ST_SW_CERT_REQ_B:
 404                         if (/* don't request cert unless asked for it: */
 405                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 406                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 407                                  * don't request cert during re-negotiation: */
 408                                 ((s->session->peer != NULL) &&
 409                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 410                                 /* never request cert in anonymous ciphersuites
 411                                  * (see section "Certificate request" in SSL 3 drafts
 412                                  * and in RFC 2246): */
 413                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 414                                  /* ... except when the application insists on verification
 415                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 416                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 417                                  /* never request cert in Kerberos ciphersuites */
 418                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 419                                 {
 420                                 /* no cert request */
 421                                 skip=1;
 422                                 s->s3->tmp.cert_request=0;
 423                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 424                                 }
 425                         else
 426                                 {
 427                                 s->s3->tmp.cert_request=1;
 428                                 ret=ssl3_send_certificate_request(s);
 429                                 if (ret <= 0) goto end;
 430 #ifndef NETSCAPE_HANG_BUG
 431                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 432 #else
 433                                 s->state=SSL3_ST_SW_FLUSH;
 434                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 435 #endif
 436                                 s->init_num=0;
 437                                 }
 438                         break;
 439
 440                 case SSL3_ST_SW_SRVR_DONE_A:
 441                 case SSL3_ST_SW_SRVR_DONE_B:
 442                         ret=ssl3_send_server_done(s);
 443                         if (ret <= 0) goto end;
 444                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 445                         s->state=SSL3_ST_SW_FLUSH;
 446                         s->init_num=0;
 447                         break;
 448
 449                 case SSL3_ST_SW_FLUSH:
 450                         /* number of bytes to be flushed */
 451                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 452                         if (num1 > 0)
 453                                 {
 454                                 s->rwstate=SSL_WRITING;
 455                                 num1=BIO_flush(s->wbio);
 456                                 if (num1 <= 0) { ret= -1; goto end; }
 457                                 s->rwstate=SSL_NOTHING;
 458                                 }
 459
 460                         s->state=s->s3->tmp.next_state;
 461                         break;
 462
 463                 case SSL3_ST_SR_CERT_A:
 464                 case SSL3_ST_SR_CERT_B:
 465                         /* Check for second client hello (MS SGC) */
 466                         ret = ssl3_check_client_hello(s);
 467                         if (ret <= 0)
 468                                 goto end;
 469                         if (ret == 2)
 470                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 471                         else {
 472                                 /* could be sent for a DH cert, even if we
 473                                  * have not asked for it :-) */
 474                                 ret=ssl3_get_client_certificate(s);
 475                                 if (ret <= 0) goto end;
 476                                 s->init_num=0;
 477                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 478                         }
 479                         break;
 480
 481                 case SSL3_ST_SR_KEY_EXCH_A:
 482                 case SSL3_ST_SR_KEY_EXCH_B:
 483                         ret=ssl3_get_client_key_exchange(s);
 484                         if (ret <= 0)
 485                                 goto end;
 486                         if (ret == 2)
 487                                 {
 488                                 /* For the ECDH ciphersuites when
 489                                  * the client sends its ECDH pub key in
 490                                  * a certificate, the CertificateVerify
 491                                  * message is not sent.
 492                                  */
 493                                 s->state=SSL3_ST_SR_FINISHED_A;
 494                                 s->init_num = 0;
 495                                 }
 496                         else
 497                                 {
 498                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 499                                 s->init_num=0;
 500
 501                                 /* We need to get hashes here so if there is
 502                                  * a client cert, it can be verified
 503                                  */
 504                                 s->method->ssl3_enc->cert_verify_mac(s,
 505                                     &(s->s3->finish_dgst1),
 506                                     &(s->s3->tmp.cert_verify_md[0]));
 507                                 s->method->ssl3_enc->cert_verify_mac(s,
 508                                     &(s->s3->finish_dgst2),
 509                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 510                                 }
 511                         break;
 512
 513                 case SSL3_ST_SR_CERT_VRFY_A:
 514                 case SSL3_ST_SR_CERT_VRFY_B:
 515
 516                         /* we should decide if we expected this one */
 517                         ret=ssl3_get_cert_verify(s);
 518                         if (ret <= 0) goto end;
 519
 520                         s->state=SSL3_ST_SR_FINISHED_A;
 521                         s->init_num=0;
 522                         break;
 523
 524                 case SSL3_ST_SR_FINISHED_A:
 525                 case SSL3_ST_SR_FINISHED_B:
 526                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 527                                 SSL3_ST_SR_FINISHED_B);
 528                         if (ret <= 0) goto end;
 529                         if (s->hit)
 530                                 s->state=SSL_ST_OK;
 531                         else
 532                                 s->state=SSL3_ST_SW_CHANGE_A;
 533                         s->init_num=0;
 534                         break;
 535
 536                 case SSL3_ST_SW_CHANGE_A:
 537                 case SSL3_ST_SW_CHANGE_B:
 538
 539                         s->session->cipher=s->s3->tmp.new_cipher;
 540                         if (!s->method->ssl3_enc->setup_key_block(s))
 541                                 { ret= -1; goto end; }
 542
 543                         ret=ssl3_send_change_cipher_spec(s,
 544                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 545
 546                         if (ret <= 0) goto end;
 547                         s->state=SSL3_ST_SW_FINISHED_A;
 548                         s->init_num=0;
 549
 550                         if (!s->method->ssl3_enc->change_cipher_state(s,
 551                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 552                                 {
 553                                 ret= -1;
 554                                 goto end;
 555                                 }
 556
 557                         break;
 558
 559                 case SSL3_ST_SW_FINISHED_A:
 560                 case SSL3_ST_SW_FINISHED_B:
 561                         ret=ssl3_send_finished(s,
 562                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 563                                 s->method->ssl3_enc->server_finished_label,
 564                                 s->method->ssl3_enc->server_finished_label_len);
 565                         if (ret <= 0) goto end;
 566                         s->state=SSL3_ST_SW_FLUSH;
 567                         if (s->hit)
 568                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 569                         else
 570                                 s->s3->tmp.next_state=SSL_ST_OK;
 571                         s->init_num=0;
 572                         break;
 573
 574                 case SSL_ST_OK:
 575                         /* clean a few things up */
 576                         ssl3_cleanup_key_block(s);
 577
 578                         BUF_MEM_free(s->init_buf);
 579                         s->init_buf=NULL;
 580
 581                         /* remove buffering on output */
 582                         ssl_free_wbio_buffer(s);
 583
 584                         s->init_num=0;
 585
 586                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 587                                 {
 588                                 /* actually not necessarily a 'new' session unless
 589                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 590
 591                                 s->new_session=0;
 592
 593                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 594
 595                                 s->ctx->stats.sess_accept_good++;
 596                                 /* s->server=1; */
 597                                 s->handshake_func=ssl3_accept;
 598
 599                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 600                                 }
 601
 602                         ret = 1;
 603                         goto end;
 604                         /* break; */
 605
 606                 default:
 607                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 608                         ret= -1;
 609                         goto end;
 610                         /* break; */
 611                         }
 612
 613                 if (!s->s3->tmp.reuse_message && !skip)
 614                         {
 615                         if (s->debug)
 616                                 {
 617                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 618                                         goto end;
 619                                 }
 620
 621
 622                         if ((cb != NULL) && (s->state != state))
 623                                 {
 624                                 new_state=s->state;
 625                                 s->state=state;
 626                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 627                                 s->state=new_state;
 628                                 }
 629                         }
 630                 skip=0;
 631                 }
 632 end:
 633         /* BIO_flush(s->wbio); */
 634
 635         s->in_handshake--;
 636         if (cb != NULL)
 637                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 638         return(ret);
 639         }
 640
 641 static int ssl3_send_hello_request(SSL *s)
 642         {
 643         unsigned char *p;
 644
 645         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 646                 {
 647                 p=(unsigned char *)s->init_buf->data;
 648                 *(p++)=SSL3_MT_HELLO_REQUEST;
 649                 *(p++)=0;
 650                 *(p++)=0;
 651                 *(p++)=0;
 652
 653                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 654                 /* number of bytes to write */
 655                 s->init_num=4;
 656                 s->init_off=0;
 657                 }
 658
 659         /* SSL3_ST_SW_HELLO_REQ_B */
 660         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 661         }
 662
 663 static int ssl3_check_client_hello(SSL *s)
 664         {
 665         int ok;
 666         long n;
 667
 668         /* this function is called when we really expect a Certificate message,
 669          * so permit appropriate message length */
 670         n=ssl3_get_message(s,
 671                 SSL3_ST_SR_CERT_A,
 672                 SSL3_ST_SR_CERT_B,
 673                 -1,
 674                 s->max_cert_list,
 675                 &ok);
 676         if (!ok) return((int)n);
 677         s->s3->tmp.reuse_message = 1;
 678         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 679                 {
 680                 /* Throw away what we have done so far in the current handshake,
 681                  * which will now be aborted. (A full SSL_clear would be too much.)
 682                  * I hope that tmp.dh is the only thing that may need to be cleared
 683                  * when a handshake is not completed ... */
 684 #ifndef OPENSSL_NO_DH
 685                 if (s->s3->tmp.dh != NULL)
 686                         {
 687                         DH_free(s->s3->tmp.dh);
 688                         s->s3->tmp.dh = NULL;
 689                         }
 690 #endif
 691                 return 2;
 692                 }
 693         return 1;
 694 }
 695
 696 static int ssl3_get_client_hello(SSL *s)
 697         {
 698         int i,j,ok,al,ret= -1;
 699         long n;
 700         unsigned long id;
 701         unsigned char *p,*d,*q;
 702         SSL_CIPHER *c;
 703         SSL_COMP *comp=NULL;
 704         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 705
 706         /* We do this so that we will respond with our native type.
 707          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 708          * This down switching should be handled by a different method.
 709          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 710          * TLSv1.
 711          */
 712         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 713                 {
 714                 s->first_packet=1;
 715                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 716                 }
 717         n=ssl3_get_message(s,
 718                 SSL3_ST_SR_CLNT_HELLO_B,
 719                 SSL3_ST_SR_CLNT_HELLO_C,
 720                 SSL3_MT_CLIENT_HELLO,
 721                 SSL3_RT_MAX_PLAIN_LENGTH,
 722                 &ok);
 723
 724         if (!ok) return((int)n);
 725         d=p=(unsigned char *)s->init_msg;
 726
 727         /* use version from inside client hello, not from record header
 728          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 729         s->client_version=(((int)p[0])<<8)|(int)p[1];
 730         p+=2;
 731
 732         if (s->client_version < s->version)
 733                 {
 734                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 735                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 736                         {
 737                         /* similar to ssl3_get_record, send alert using remote version number */
 738                         s->version = s->client_version;
 739                         }
 740                 al = SSL_AD_PROTOCOL_VERSION;
 741                 goto f_err;
 742                 }
 743
 744         /* load the client random */
 745         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 746         p+=SSL3_RANDOM_SIZE;
 747
 748         /* get the session-id */
 749         j= *(p++);
 750
 751         s->hit=0;
 752         /* Versions before 0.9.7 always allow session reuse during renegotiation
 753          * (i.e. when s->new_session is true), option
 754          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 755          * Maybe this optional behaviour should always have been the default,
 756          * but we cannot safely change the default behaviour (or new applications
 757          * might be written that become totally unsecure when compiled with
 758          * an earlier library version)
 759          */
 760         if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 761                 {
 762                 if (!ssl_get_new_session(s,1))
 763                         goto err;
 764                 }
 765         else
 766                 {
 767                 i=ssl_get_prev_session(s,p,j);
 768                 if (i == 1)
 769                         { /* previous session */
 770                         s->hit=1;
 771                         }
 772                 else if (i == -1)
 773                         goto err;
 774                 else /* i == 0 */
 775                         {
 776                         if (!ssl_get_new_session(s,1))
 777                                 goto err;
 778                         }
 779                 }
 780
 781         p+=j;
 782         n2s(p,i);
 783         if ((i == 0) && (j != 0))
 784                 {
 785                 /* we need a cipher if we are not resuming a session */
 786                 al=SSL_AD_ILLEGAL_PARAMETER;
 787                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 788                 goto f_err;
 789                 }
 790         if ((p+i) >= (d+n))
 791                 {
 792                 /* not enough data */
 793                 al=SSL_AD_DECODE_ERROR;
 794                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 795                 goto f_err;
 796                 }
 797         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 798                 == NULL))
 799                 {
 800                 goto err;
 801                 }
 802         p+=i;
 803
 804         /* If it is a hit, check that the cipher is in the list */
 805         if ((s->hit) && (i > 0))
 806                 {
 807                 j=0;
 808                 id=s->session->cipher->id;
 809
 810 #ifdef CIPHER_DEBUG
 811                 printf("client sent %d ciphers\n",sk_num(ciphers));
 812 #endif
 813                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 814                         {
 815                         c=sk_SSL_CIPHER_value(ciphers,i);
 816 #ifdef CIPHER_DEBUG
 817                         printf("client [%2d of %2d]:%s\n",
 818                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 819 #endif
 820                         if (c->id == id)
 821                                 {
 822                                 j=1;
 823                                 break;
 824                                 }
 825                         }
 826                 if (j == 0)
 827                         {
 828                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 829                                 {
 830                                 /* Very bad for multi-threading.... */
 831                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 832                                                                        0);
 833                                 }
 834                         else
 835                                 {
 836                                 /* we need to have the cipher in the cipher
 837                                  * list if we are asked to reuse it */
 838                                 al=SSL_AD_ILLEGAL_PARAMETER;
 839                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 840                                 goto f_err;
 841                                 }
 842                         }
 843                 }
 844
 845         /* compression */
 846         i= *(p++);
 847         if ((p+i) > (d+n))
 848                 {
 849                 /* not enough data */
 850                 al=SSL_AD_DECODE_ERROR;
 851                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 852                 goto f_err;
 853                 }
 854         q=p;
 855         for (j=0; j<i; j++)
 856                 {
 857                 if (p[j] == 0) break;
 858                 }
 859
 860         p+=i;
 861         if (j >= i)
 862                 {
 863                 /* no compress */
 864                 al=SSL_AD_DECODE_ERROR;
 865                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 866                 goto f_err;
 867                 }
 868
 869         /* Worst case, we will use the NULL compression, but if we have other
 870          * options, we will now look for them.  We have i-1 compression
 871          * algorithms from the client, starting at q. */
 872         s->s3->tmp.new_compression=NULL;
 873         if (s->ctx->comp_methods != NULL)
 874                 { /* See if we have a match */
 875                 int m,nn,o,v,done=0;
 876
 877                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 878                 for (m=0; m<nn; m++)
 879                         {
 880                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 881                         v=comp->id;
 882                         for (o=0; o<i; o++)
 883                                 {
 884                                 if (v == q[o])
 885                                         {
 886                                         done=1;
 887                                         break;
 888                                         }
 889                                 }
 890                         if (done) break;
 891                         }
 892                 if (done)
 893                         s->s3->tmp.new_compression=comp;
 894                 else
 895                         comp=NULL;
 896                 }
 897
 898         /* TLS does not mind if there is extra stuff */
 899         if (s->version == SSL3_VERSION)
 900                 {
 901                 if (p < (d+n))
 902                         {
 903                         /* wrong number of bytes,
 904                          * there could be more to follow */
 905                         al=SSL_AD_DECODE_ERROR;
 906                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 907                         goto f_err;
 908                         }
 909                 }
 910
 911         /* Given s->session->ciphers and SSL_get_ciphers, we must
 912          * pick a cipher */
 913
 914         if (!s->hit)
 915                 {
 916                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 917                 if (s->session->ciphers != NULL)
 918                         sk_SSL_CIPHER_free(s->session->ciphers);
 919                 s->session->ciphers=ciphers;
 920                 if (ciphers == NULL)
 921                         {
 922                         al=SSL_AD_ILLEGAL_PARAMETER;
 923                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 924                         goto f_err;
 925                         }
 926                 ciphers=NULL;
 927                 c=ssl3_choose_cipher(s,s->session->ciphers,
 928                                      SSL_get_ciphers(s));
 929
 930                 if (c == NULL)
 931                         {
 932                         al=SSL_AD_HANDSHAKE_FAILURE;
 933                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 934                         goto f_err;
 935                         }
 936                 s->s3->tmp.new_cipher=c;
 937                 }
 938         else
 939                 {
 940                 /* Session-id reuse */
 941 #ifdef REUSE_CIPHER_BUG
 942                 STACK_OF(SSL_CIPHER) *sk;
 943                 SSL_CIPHER *nc=NULL;
 944                 SSL_CIPHER *ec=NULL;
 945
 946                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 947                         {
 948                         sk=s->session->ciphers;
 949                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 950                                 {
 951                                 c=sk_SSL_CIPHER_value(sk,i);
 952                                 if (c->algorithms & SSL_eNULL)
 953                                         nc=c;
 954                                 if (SSL_C_IS_EXPORT(c))
 955                                         ec=c;
 956                                 }
 957                         if (nc != NULL)
 958                                 s->s3->tmp.new_cipher=nc;
 959                         else if (ec != NULL)
 960                                 s->s3->tmp.new_cipher=ec;
 961                         else
 962                                 s->s3->tmp.new_cipher=s->session->cipher;
 963                         }
 964                 else
 965 #endif
 966                 s->s3->tmp.new_cipher=s->session->cipher;
 967                 }
 968
 969         /* we now have the following setup.
 970          * client_random
 971          * cipher_list          - our prefered list of ciphers
 972          * ciphers              - the clients prefered list of ciphers
 973          * compression          - basically ignored right now
 974          * ssl version is set   - sslv3
 975          * s->session           - The ssl session has been setup.
 976          * s->hit               - session reuse flag
 977          * s->tmp.new_cipher    - the new cipher to use.
 978          */
 979
 980         ret=1;
 981         if (0)
 982                 {
 983 f_err:
 984                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 985                 }
 986 err:
 987         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 988         return(ret);
 989         }
 990
 991 static int ssl3_send_server_hello(SSL *s)
 992         {
 993         unsigned char *buf;
 994         unsigned char *p,*d;
 995         int i,sl;
 996         unsigned long l,Time;
 997
 998         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 999                 {
1000                 buf=(unsigned char *)s->init_buf->data;
1001                 p=s->s3->server_random;
1002                 Time=time(NULL);                        /* Time */
1003                 l2n(Time,p);
1004                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
1005                 /* Do the message type and length last */
1006                 d=p= &(buf[4]);
1007
1008                 *(p++)=s->version>>8;
1009                 *(p++)=s->version&0xff;
1010
1011                 /* Random stuff */
1012                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1013                 p+=SSL3_RANDOM_SIZE;
1014
1015                 /* now in theory we have 3 options to sending back the
1016                  * session id.  If it is a re-use, we send back the
1017                  * old session-id, if it is a new session, we send
1018                  * back the new session-id or we send back a 0 length
1019                  * session-id if we want it to be single use.
1020                  * Currently I will not implement the '0' length session-id
1021                  * 12-Jan-98 - I'll now support the '0' length stuff.
1022                  */
1023                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
1024                         s->session->session_id_length=0;
1025
1026                 sl=s->session->session_id_length;
1027                 if (sl > sizeof s->session->session_id)
1028                         {
1029                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1030                         return -1;
1031                         }
1032                 *(p++)=sl;
1033                 memcpy(p,s->session->session_id,sl);
1034                 p+=sl;
1035
1036                 /* put the cipher */
1037                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1038                 p+=i;
1039
1040                 /* put the compression method */
1041                 if (s->s3->tmp.new_compression == NULL)
1042                         *(p++)=0;
1043                 else
1044                         *(p++)=s->s3->tmp.new_compression->id;
1045
1046                 /* do the header */
1047                 l=(p-d);
1048                 d=buf;
1049                 *(d++)=SSL3_MT_SERVER_HELLO;
1050                 l2n3(l,d);
1051
1052                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1053                 /* number of bytes to write */
1054                 s->init_num=p-buf;
1055                 s->init_off=0;
1056                 }
1057
1058         /* SSL3_ST_CW_CLNT_HELLO_B */
1059         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1060         }
1061
1062 static int ssl3_send_server_done(SSL *s)
1063         {
1064         unsigned char *p;
1065
1066         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1067                 {
1068                 p=(unsigned char *)s->init_buf->data;
1069
1070                 /* do the header */
1071                 *(p++)=SSL3_MT_SERVER_DONE;
1072                 *(p++)=0;
1073                 *(p++)=0;
1074                 *(p++)=0;
1075
1076                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1077                 /* number of bytes to write */
1078                 s->init_num=4;
1079                 s->init_off=0;
1080                 }
1081
1082         /* SSL3_ST_CW_CLNT_HELLO_B */
1083         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1084         }
1085
1086 static int ssl3_send_server_key_exchange(SSL *s)
1087         {
1088 #ifndef OPENSSL_NO_RSA
1089         unsigned char *q;
1090         int j,num;
1091         RSA *rsa;
1092         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1093         unsigned int u;
1094 #endif
1095 #ifndef OPENSSL_NO_DH
1096         DH *dh=NULL,*dhp;
1097 #endif
1098 #ifndef OPENSSL_NO_ECDH
1099         EC_KEY *ecdh=NULL, *ecdhp;
1100         unsigned char *encodedPoint = NULL;
1101         int encodedlen = 0;
1102         int curve_id = 0;
1103         BN_CTX *bn_ctx = NULL;
1104 #endif
1105         EVP_PKEY *pkey;
1106         unsigned char *p,*d;
1107         int al,i;
1108         unsigned long type;
1109         int n;
1110         CERT *cert;
1111         BIGNUM *r[4];
1112         int nr[4],kn;
1113         BUF_MEM *buf;
1114         EVP_MD_CTX md_ctx;
1115
1116         EVP_MD_CTX_init(&md_ctx);
1117         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1118                 {
1119                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1120                 cert=s->cert;
1121
1122                 buf=s->init_buf;
1123
1124                 r[0]=r[1]=r[2]=r[3]=NULL;
1125                 n=0;
1126 #ifndef OPENSSL_NO_RSA
1127                 if (type & SSL_kRSA)
1128                         {
1129                         rsa=cert->rsa_tmp;
1130                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1131                                 {
1132                                 rsa=s->cert->rsa_tmp_cb(s,
1133                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1134                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1135                                 if(rsa == NULL)
1136                                 {
1137                                         al=SSL_AD_HANDSHAKE_FAILURE;
1138                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1139                                         goto f_err;
1140                                 }
1141                                 RSA_up_ref(rsa);
1142                                 cert->rsa_tmp=rsa;
1143                                 }
1144                         if (rsa == NULL)
1145                                 {
1146                                 al=SSL_AD_HANDSHAKE_FAILURE;
1147                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1148                                 goto f_err;
1149                                 }
1150                         r[0]=rsa->n;
1151                         r[1]=rsa->e;
1152                         s->s3->tmp.use_rsa_tmp=1;
1153                         }
1154                 else
1155 #endif
1156 #ifndef OPENSSL_NO_DH
1157                         if (type & SSL_kEDH)
1158                         {
1159                         dhp=cert->dh_tmp;
1160                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1161                                 dhp=s->cert->dh_tmp_cb(s,
1162                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1163                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1164                         if (dhp == NULL)
1165                                 {
1166                                 al=SSL_AD_HANDSHAKE_FAILURE;
1167                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1168                                 goto f_err;
1169                                 }
1170
1171                         if (s->s3->tmp.dh != NULL)
1172                                 {
1173                                 DH_free(dh);
1174                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1175                                 goto err;
1176                                 }
1177
1178                         if ((dh=DHparams_dup(dhp)) == NULL)
1179                                 {
1180                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1181                                 goto err;
1182                                 }
1183
1184                         s->s3->tmp.dh=dh;
1185                         if ((dhp->pub_key == NULL ||
1186                              dhp->priv_key == NULL ||
1187                              (s->options & SSL_OP_SINGLE_DH_USE)))
1188                                 {
1189                                 if(!DH_generate_key(dh))
1190                                     {
1191                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1192                                            ERR_R_DH_LIB);
1193                                     goto err;
1194                                     }
1195                                 }
1196                         else
1197                                 {
1198                                 dh->pub_key=BN_dup(dhp->pub_key);
1199                                 dh->priv_key=BN_dup(dhp->priv_key);
1200                                 if ((dh->pub_key == NULL) ||
1201                                         (dh->priv_key == NULL))
1202                                         {
1203                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1204                                         goto err;
1205                                         }
1206                                 }
1207                         r[0]=dh->p;
1208                         r[1]=dh->g;
1209                         r[2]=dh->pub_key;
1210                         }
1211                 else
1212 #endif
1213 #ifndef OPENSSL_NO_ECDH
1214                         if (type & SSL_kECDHE)
1215                         {
1216                         ecdhp=cert->ecdh_tmp;
1217                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1218                                 {
1219                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1220                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1221                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1222                                 }
1223                         if (ecdhp == NULL)
1224                                 {
1225                                 al=SSL_AD_HANDSHAKE_FAILURE;
1226                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1227                                 goto f_err;
1228                                 }
1229
1230                         if (s->s3->tmp.ecdh != NULL)
1231                                 {
1232                                 EC_KEY_free(s->s3->tmp.ecdh);
1233                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1234                                 goto err;
1235                                 }
1236
1237                         /* Duplicate the ECDH structure. */
1238                         if (ecdhp == NULL)
1239                                 {
1240                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1241                                 goto err;
1242                                 }
1243                         if (!EC_KEY_up_ref(ecdhp))
1244                                 {
1245                                 SSLerr(SSL_F_SSL3_CTRL,ERR_R_ECDH_LIB);
1246                                 goto err;
1247                                 }
1248                         ecdh = ecdhp;
1249
1250                         s->s3->tmp.ecdh=ecdh;
1251                         if ((ecdh->pub_key == NULL) ||
1252                             (ecdh->priv_key == NULL) ||
1253                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1254                                 {
1255                                 if(!EC_KEY_generate_key(ecdh))
1256                                     {
1257                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1258                                     goto err;
1259                                     }
1260                                 }
1261
1262                         if ((ecdh->group == NULL) ||
1263                             (ecdh->pub_key == NULL) ||
1264                             (ecdh->priv_key == NULL))
1265                                 {
1266                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1267                                 goto err;
1268                                 }
1269
1270                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1271                             (EC_GROUP_get_degree(ecdh->group) > 163))
1272                                 {
1273                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1274                                 goto err;
1275                                 }
1276
1277                         /* XXX: For now, we only support ephemeral ECDH
1278                          * keys over named (not generic) curves. For
1279                          * supported named curves, curve_id is non-zero.
1280                          */
1281                         if ((curve_id =
1282                             nid2curve_id(EC_GROUP_get_nid(ecdh->group)))
1283                             == 0)
1284                                 {
1285                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1286                                 goto err;
1287                                 }
1288
1289                         /* Encode the public key.
1290                          * First check the size of encoding and
1291                          * allocate memory accordingly.
1292                          */
1293                         encodedlen = EC_POINT_point2oct(ecdh->group,
1294                             ecdh->pub_key,
1295                             POINT_CONVERSION_UNCOMPRESSED,
1296                             NULL, 0, NULL);
1297
1298                         encodedPoint = (unsigned char *)
1299                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1300                         bn_ctx = BN_CTX_new();
1301                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1302                                 {
1303                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1304                                 goto err;
1305                                 }
1306
1307
1308                         encodedlen = EC_POINT_point2oct(ecdh->group,
1309                             ecdh->pub_key,
1310                             POINT_CONVERSION_UNCOMPRESSED,
1311                             encodedPoint, encodedlen, bn_ctx);
1312
1313                         if (encodedlen == 0)
1314                                 {
1315                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1316                                 goto err;
1317                                 }
1318
1319                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1320
1321                         /* XXX: For now, we only support named (not
1322                          * generic) curves in ECDH ephemeral key exchanges.
1323                          * In this situation, we need three additional bytes
1324                          * to encode the entire ServerECDHParams
1325                          * structure.
1326                          */
1327                         n = 3 + encodedlen;
1328
1329                         /* We'll generate the serverKeyExchange message
1330                          * explicitly so we can set these to NULLs
1331                          */
1332                         r[0]=NULL;
1333                         r[1]=NULL;
1334                         r[2]=NULL;
1335                         }
1336                 else
1337 #endif /* !OPENSSL_NO_ECDH */
1338                         {
1339                         al=SSL_AD_HANDSHAKE_FAILURE;
1340                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1341                         goto f_err;
1342                         }
1343                 for (i=0; r[i] != NULL; i++)
1344                         {
1345                         nr[i]=BN_num_bytes(r[i]);
1346                         n+=2+nr[i];
1347                         }
1348
1349                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1350                         {
1351                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1352                                 == NULL)
1353                                 {
1354                                 al=SSL_AD_DECODE_ERROR;
1355                                 goto f_err;
1356                                 }
1357                         kn=EVP_PKEY_size(pkey);
1358                         }
1359                 else
1360                         {
1361                         pkey=NULL;
1362                         kn=0;
1363                         }
1364
1365                 if (!BUF_MEM_grow(buf,n+4+kn))
1366                         {
1367                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1368                         goto err;
1369                         }
1370                 d=(unsigned char *)s->init_buf->data;
1371                 p= &(d[4]);
1372
1373                 for (i=0; r[i] != NULL; i++)
1374                         {
1375                         s2n(nr[i],p);
1376                         BN_bn2bin(r[i],p);
1377                         p+=nr[i];
1378                         }
1379
1380 #ifndef OPENSSL_NO_ECDH
1381                 if (type & SSL_kECDHE)
1382                         {
1383                         /* XXX: For now, we only support named (not generic) curves.
1384                          * In this situation, the serverKeyExchange message has:
1385                          * [1 byte CurveType], [1 byte CurveName]
1386                          * [1 byte length of encoded point], followed by
1387                          * the actual encoded point itself
1388                          */
1389                         *p = NAMED_CURVE_TYPE;
1390                         p += 1;
1391                         *p = curve_id;
1392                         p += 1;
1393                         *p = encodedlen;
1394                         p += 1;
1395                         memcpy((unsigned char*)p,
1396                             (unsigned char *)encodedPoint,
1397                             encodedlen);
1398                         OPENSSL_free(encodedPoint);
1399                         p += encodedlen;
1400                         }
1401 #endif
1402
1403                 /* not anonymous */
1404                 if (pkey != NULL)
1405                         {
1406                         /* n is the length of the params, they start at &(d[4])
1407                          * and p points to the space at the end. */
1408 #ifndef OPENSSL_NO_RSA
1409                         if (pkey->type == EVP_PKEY_RSA)
1410                                 {
1411                                 q=md_buf;
1412                                 j=0;
1413                                 for (num=2; num > 0; num--)
1414                                         {
1415                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1416                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1417                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1418                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1419                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1420                                         EVP_DigestFinal_ex(&md_ctx,q,
1421                                                 (unsigned int *)&i);
1422                                         q+=i;
1423                                         j+=i;
1424                                         }
1425                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1426                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1427                                         {
1428                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1429                                         goto err;
1430                                         }
1431                                 s2n(u,p);
1432                                 n+=u+2;
1433                                 }
1434                         else
1435 #endif
1436 #if !defined(OPENSSL_NO_DSA)
1437                                 if (pkey->type == EVP_PKEY_DSA)
1438                                 {
1439                                 /* lets do DSS */
1440                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1441                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1442                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1443                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1444                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1445                                         (unsigned int *)&i,pkey))
1446                                         {
1447                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1448                                         goto err;
1449                                         }
1450                                 s2n(i,p);
1451                                 n+=i+2;
1452                                 }
1453                         else
1454 #endif
1455 #if !defined(OPENSSL_NO_ECDSA)
1456                                 if (pkey->type == EVP_PKEY_EC)
1457                                 {
1458                                 /* let's do ECDSA */
1459                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1460                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1461                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1462                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1463                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1464                                         (unsigned int *)&i,pkey))
1465                                         {
1466                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1467                                         goto err;
1468                                         }
1469                                 s2n(i,p);
1470                                 n+=i+2;
1471                                 }
1472                         else
1473 #endif
1474                                 {
1475                                 /* Is this error check actually needed? */
1476                                 al=SSL_AD_HANDSHAKE_FAILURE;
1477                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1478                                 goto f_err;
1479                                 }
1480                         }
1481
1482                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1483                 l2n3(n,d);
1484
1485                 /* we should now have things packed up, so lets send
1486                  * it off */
1487                 s->init_num=n+4;
1488                 s->init_off=0;
1489                 }
1490
1491         s->state = SSL3_ST_SW_KEY_EXCH_B;
1492         EVP_MD_CTX_cleanup(&md_ctx);
1493         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1494 f_err:
1495         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1496 err:
1497 #ifndef OPENSSL_NO_ECDH
1498         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1499         BN_CTX_free(bn_ctx);
1500 #endif
1501         EVP_MD_CTX_cleanup(&md_ctx);
1502         return(-1);
1503         }
1504
1505 static int ssl3_send_certificate_request(SSL *s)
1506         {
1507         unsigned char *p,*d;
1508         int i,j,nl,off,n;
1509         STACK_OF(X509_NAME) *sk=NULL;
1510         X509_NAME *name;
1511         BUF_MEM *buf;
1512
1513         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1514                 {
1515                 buf=s->init_buf;
1516
1517                 d=p=(unsigned char *)&(buf->data[4]);
1518
1519                 /* get the list of acceptable cert types */
1520                 p++;
1521                 n=ssl3_get_req_cert_type(s,p);
1522                 d[0]=n;
1523                 p+=n;
1524                 n++;
1525
1526                 off=n;
1527                 p+=2;
1528                 n+=2;
1529
1530                 sk=SSL_get_client_CA_list(s);
1531                 nl=0;
1532                 if (sk != NULL)
1533                         {
1534                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1535                                 {
1536                                 name=sk_X509_NAME_value(sk,i);
1537                                 j=i2d_X509_NAME(name,NULL);
1538                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1539                                         {
1540                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1541                                         goto err;
1542                                         }
1543                                 p=(unsigned char *)&(buf->data[4+n]);
1544                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1545                                         {
1546                                         s2n(j,p);
1547                                         i2d_X509_NAME(name,&p);
1548                                         n+=2+j;
1549                                         nl+=2+j;
1550                                         }
1551                                 else
1552                                         {
1553                                         d=p;
1554                                         i2d_X509_NAME(name,&p);
1555                                         j-=2; s2n(j,d); j+=2;
1556                                         n+=j;
1557                                         nl+=j;
1558                                         }
1559                                 }
1560                         }
1561                 /* else no CA names */
1562                 p=(unsigned char *)&(buf->data[4+off]);
1563                 s2n(nl,p);
1564
1565                 d=(unsigned char *)buf->data;
1566                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1567                 l2n3(n,d);
1568
1569                 /* we should now have things packed up, so lets send
1570                  * it off */
1571
1572                 s->init_num=n+4;
1573                 s->init_off=0;
1574 #ifdef NETSCAPE_HANG_BUG
1575                 p=(unsigned char *)s->init_buf->data + s->init_num;
1576
1577                 /* do the header */
1578                 *(p++)=SSL3_MT_SERVER_DONE;
1579                 *(p++)=0;
1580                 *(p++)=0;
1581                 *(p++)=0;
1582                 s->init_num += 4;
1583 #endif
1584
1585                 }
1586
1587         /* SSL3_ST_SW_CERT_REQ_B */
1588         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1589 err:
1590         return(-1);
1591         }
1592
1593 static int ssl3_get_client_key_exchange(SSL *s)
1594         {
1595         int i,al,ok;
1596         long n;
1597         unsigned long l;
1598         unsigned char *p;
1599 #ifndef OPENSSL_NO_RSA
1600         RSA *rsa=NULL;
1601         EVP_PKEY *pkey=NULL;
1602 #endif
1603 #ifndef OPENSSL_NO_DH
1604         BIGNUM *pub=NULL;
1605         DH *dh_srvr;
1606 #endif
1607 #ifndef OPENSSL_NO_KRB5
1608         KSSL_ERR kssl_err;
1609 #endif /* OPENSSL_NO_KRB5 */
1610
1611 #ifndef OPENSSL_NO_ECDH
1612         EC_KEY *srvr_ecdh = NULL;
1613         EVP_PKEY *clnt_pub_pkey = NULL;
1614         EC_POINT *clnt_ecpoint = NULL;
1615         BN_CTX *bn_ctx = NULL;
1616 #endif
1617
1618         n=ssl3_get_message(s,
1619                 SSL3_ST_SR_KEY_EXCH_A,
1620                 SSL3_ST_SR_KEY_EXCH_B,
1621                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1622                 2048, /* ??? */
1623                 &ok);
1624
1625         if (!ok) return((int)n);
1626         p=(unsigned char *)s->init_msg;
1627
1628         l=s->s3->tmp.new_cipher->algorithms;
1629
1630 #ifndef OPENSSL_NO_RSA
1631         if (l & SSL_kRSA)
1632                 {
1633                 /* FIX THIS UP EAY EAY EAY EAY */
1634                 if (s->s3->tmp.use_rsa_tmp)
1635                         {
1636                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1637                                 rsa=s->cert->rsa_tmp;
1638                         /* Don't do a callback because rsa_tmp should
1639                          * be sent already */
1640                         if (rsa == NULL)
1641                                 {
1642                                 al=SSL_AD_HANDSHAKE_FAILURE;
1643                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1644                                 goto f_err;
1645
1646                                 }
1647                         }
1648                 else
1649                         {
1650                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1651                         if (    (pkey == NULL) ||
1652                                 (pkey->type != EVP_PKEY_RSA) ||
1653                                 (pkey->pkey.rsa == NULL))
1654                                 {
1655                                 al=SSL_AD_HANDSHAKE_FAILURE;
1656                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1657                                 goto f_err;
1658                                 }
1659                         rsa=pkey->pkey.rsa;
1660                         }
1661
1662                 /* TLS */
1663                 if (s->version > SSL3_VERSION)
1664                         {
1665                         n2s(p,i);
1666                         if (n != i+2)
1667                                 {
1668                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1669                                         {
1670                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1671                                         goto err;
1672                                         }
1673                                 else
1674                                         p-=2;
1675                                 }
1676                         else
1677                                 n=i;
1678                         }
1679
1680                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1681
1682                 al = -1;
1683
1684                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1685                         {
1686                         al=SSL_AD_DECODE_ERROR;
1687                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1688                         }
1689
1690                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1691                         {
1692                         /* The premaster secret must contain the same version number as the
1693                          * ClientHello to detect version rollback attacks (strangely, the
1694                          * protocol does not offer such protection for DH ciphersuites).
1695                          * However, buggy clients exist that send the negotiated protocol
1696                          * version instead if the server does not support the requested
1697                          * protocol version.
1698                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1699                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1700                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1701                                 {
1702                                 al=SSL_AD_DECODE_ERROR;
1703                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1704                                 goto f_err;
1705                                 }
1706                         }
1707
1708                 if (al != -1)
1709                         {
1710 #if 0
1711                         goto f_err;
1712 #else
1713                         /* Some decryption failure -- use random value instead as countermeasure
1714                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1715                          * (see RFC 2246, section 7.4.7.1).
1716                          * But note that due to length and protocol version checking, the
1717                          * attack is impractical anyway (see section 5 in D. Bleichenbacher:
1718                          * "Chosen Ciphertext Attacks Against Protocols Based on the RSA
1719                          * Encryption Standard PKCS #1", CRYPTO '98, LNCS 1462, pp. 1-12).
1720                          */
1721                         ERR_clear_error();
1722                         i = SSL_MAX_MASTER_KEY_LENGTH;
1723                         p[0] = s->client_version >> 8;
1724                         p[1] = s->client_version & 0xff;
1725                         RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */
1726 #endif
1727                         }
1728
1729                 s->session->master_key_length=
1730                         s->method->ssl3_enc->generate_master_secret(s,
1731                                 s->session->master_key,
1732                                 p,i);
1733                 memset(p,0,i);
1734                 }
1735         else
1736 #endif
1737 #ifndef OPENSSL_NO_DH
1738                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1739                 {
1740                 n2s(p,i);
1741                 if (n != i+2)
1742                         {
1743                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1744                                 {
1745                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1746                                 goto err;
1747                                 }
1748                         else
1749                                 {
1750                                 p-=2;
1751                                 i=(int)n;
1752                                 }
1753                         }
1754
1755                 if (n == 0L) /* the parameters are in the cert */
1756                         {
1757                         al=SSL_AD_HANDSHAKE_FAILURE;
1758                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1759                         goto f_err;
1760                         }
1761                 else
1762                         {
1763                         if (s->s3->tmp.dh == NULL)
1764                                 {
1765                                 al=SSL_AD_HANDSHAKE_FAILURE;
1766                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1767                                 goto f_err;
1768                                 }
1769                         else
1770                                 dh_srvr=s->s3->tmp.dh;
1771                         }
1772
1773                 pub=BN_bin2bn(p,i,NULL);
1774                 if (pub == NULL)
1775                         {
1776                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1777                         goto err;
1778                         }
1779
1780                 i=DH_compute_key(p,pub,dh_srvr);
1781
1782                 if (i <= 0)
1783                         {
1784                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1785                         goto err;
1786                         }
1787
1788                 DH_free(s->s3->tmp.dh);
1789                 s->s3->tmp.dh=NULL;
1790
1791                 BN_clear_free(pub);
1792                 pub=NULL;
1793                 s->session->master_key_length=
1794                         s->method->ssl3_enc->generate_master_secret(s,
1795                                 s->session->master_key,p,i);
1796                 memset(p,0,i);
1797                 }
1798         else
1799 #endif
1800 #ifndef OPENSSL_NO_KRB5
1801         if (l & SSL_kKRB5)
1802                 {
1803                 krb5_error_code         krb5rc;
1804                 krb5_data               enc_ticket;
1805                 krb5_data               authenticator;
1806                 krb5_data               enc_pms;
1807                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1808                 EVP_CIPHER_CTX          ciph_ctx;
1809                 EVP_CIPHER              *enc = NULL;
1810                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1811                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1812                                                + EVP_MAX_BLOCK_LENGTH];
1813                 int                     padl, outl;
1814                 krb5_timestamp          authtime = 0;
1815                 krb5_ticket_times       ttimes;
1816
1817                 EVP_CIPHER_CTX_init(&ciph_ctx);
1818
1819                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1820
1821                 n2s(p,i);
1822                 enc_ticket.length = i;
1823                 enc_ticket.data = (char *)p;
1824                 p+=enc_ticket.length;
1825
1826                 n2s(p,i);
1827                 authenticator.length = i;
1828                 authenticator.data = (char *)p;
1829                 p+=authenticator.length;
1830
1831                 n2s(p,i);
1832                 enc_pms.length = i;
1833                 enc_pms.data = (char *)p;
1834                 p+=enc_pms.length;
1835
1836                 /* Note that the length is checked again below,
1837                 ** after decryption
1838                 */
1839                 if(enc_pms.length > sizeof pms)
1840                         {
1841                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1842                                SSL_R_DATA_LENGTH_TOO_LONG);
1843                         goto err;
1844                         }
1845
1846                 if (n != enc_ticket.length + authenticator.length +
1847                                                 enc_pms.length + 6)
1848                         {
1849                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1850                                 SSL_R_DATA_LENGTH_TOO_LONG);
1851                         goto err;
1852                         }
1853
1854                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1855                                         &kssl_err)) != 0)
1856                         {
1857 #ifdef KSSL_DEBUG
1858                         printf("kssl_sget_tkt rtn %d [%d]\n",
1859                                 krb5rc, kssl_err.reason);
1860                         if (kssl_err.text)
1861                                 printf("kssl_err text= %s\n", kssl_err.text);
1862 #endif  /* KSSL_DEBUG */
1863                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1864                                 kssl_err.reason);
1865                         goto err;
1866                         }
1867
1868                 /*  Note: no authenticator is not considered an error,
1869                 **  but will return authtime == 0.
1870                 */
1871                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1872                                         &authtime, &kssl_err)) != 0)
1873                         {
1874 #ifdef KSSL_DEBUG
1875                         printf("kssl_check_authent rtn %d [%d]\n",
1876                                 krb5rc, kssl_err.reason);
1877                         if (kssl_err.text)
1878                                 printf("kssl_err text= %s\n", kssl_err.text);
1879 #endif  /* KSSL_DEBUG */
1880                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1881                                 kssl_err.reason);
1882                         goto err;
1883                         }
1884
1885                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1886                         {
1887                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, krb5rc);
1888                         goto err;
1889                         }
1890
1891 #ifdef KSSL_DEBUG
1892                 kssl_ctx_show(kssl_ctx);
1893 #endif  /* KSSL_DEBUG */
1894
1895                 enc = kssl_map_enc(kssl_ctx->enctype);
1896                 if (enc == NULL)
1897                     goto err;
1898
1899                 memset(iv, 0, EVP_MAX_IV_LENGTH);       /* per RFC 1510 */
1900
1901                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
1902                         {
1903                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1904                                 SSL_R_DECRYPTION_FAILED);
1905                         goto err;
1906                         }
1907                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1908                                         (unsigned char *)enc_pms.data, enc_pms.length))
1909                         {
1910                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1911                                 SSL_R_DECRYPTION_FAILED);
1912                         goto err;
1913                         }
1914                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1915                         {
1916                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1917                                 SSL_R_DATA_LENGTH_TOO_LONG);
1918                         goto err;
1919                         }
1920                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
1921                         {
1922                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1923                                 SSL_R_DECRYPTION_FAILED);
1924                         goto err;
1925                         }
1926                 outl += padl;
1927                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1928                         {
1929                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1930                                 SSL_R_DATA_LENGTH_TOO_LONG);
1931                         goto err;
1932                         }
1933                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1934
1935                 s->session->master_key_length=
1936                         s->method->ssl3_enc->generate_master_secret(s,
1937                                 s->session->master_key, pms, outl);
1938
1939                 if (kssl_ctx->client_princ)
1940                         {
1941                         int len = strlen(kssl_ctx->client_princ);
1942                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
1943                                 {
1944                                 s->session->krb5_client_princ_len = len;
1945                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
1946                                 }
1947                         }
1948
1949
1950                 /*  Was doing kssl_ctx_free() here,
1951                 **  but it caused problems for apache.
1952                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
1953                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
1954                 */
1955                 }
1956         else
1957 #endif  /* OPENSSL_NO_KRB5 */
1958
1959 #ifndef OPENSSL_NO_ECDH
1960                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1961                 {
1962                 int ret = 1;
1963
1964                 /* initialize structures for server's ECDH key pair */
1965                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
1966                         {
1967                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1968                             ERR_R_MALLOC_FAILURE);
1969                         goto err;
1970                         }
1971
1972                 /* Let's get server private key and group information */
1973                 if (l & SSL_kECDH)
1974                         {
1975                         /* use the certificate */
1976                         srvr_ecdh->group = s->cert->key->privatekey-> \
1977                             pkey.eckey->group;
1978                         srvr_ecdh->priv_key = s->cert->key->privatekey-> \
1979                             pkey.eckey->priv_key;
1980                         }
1981                 else
1982                         {
1983                         /* use the ephermeral values we saved when
1984                          * generating the ServerKeyExchange msg.
1985                          */
1986                         srvr_ecdh->group = s->s3->tmp.ecdh->group;
1987                         srvr_ecdh->priv_key = s->s3->tmp.ecdh->priv_key;
1988                         }
1989
1990                 /* Let's get client's public key */
1991                 if ((clnt_ecpoint = EC_POINT_new(srvr_ecdh->group))
1992                     == NULL)
1993                         {
1994                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1995                             ERR_R_MALLOC_FAILURE);
1996                         goto err;
1997                         }
1998
1999                 if (n == 0L)
2000                         {
2001                         /* Client Publickey was in Client Certificate */
2002
2003                          if (l & SSL_kECDHE)
2004                                  {
2005                                  al=SSL_AD_HANDSHAKE_FAILURE;
2006                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2007                                  goto f_err;
2008                                  }
2009                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2010                             == NULL) ||
2011                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2012                                 {
2013                                 /* XXX: For now, we do not support client
2014                                  * authentication using ECDH certificates
2015                                  * so this branch (n == 0L) of the code is
2016                                  * never executed. When that support is
2017                                  * added, we ought to ensure the key
2018                                  * received in the certificate is
2019                                  * authorized for key agreement.
2020                                  * ECDH_compute_key implicitly checks that
2021                                  * the two ECDH shares are for the same
2022                                  * group.
2023                                  */
2024                                 al=SSL_AD_HANDSHAKE_FAILURE;
2025                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2026                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2027                                 goto f_err;
2028                                 }
2029
2030                         EC_POINT_copy(clnt_ecpoint,
2031                             clnt_pub_pkey->pkey.eckey->pub_key);
2032                         ret = 2; /* Skip certificate verify processing */
2033                         }
2034                 else
2035                         {
2036                         /* Get client's public key from encoded point
2037                          * in the ClientKeyExchange message.
2038                          */
2039                         if ((bn_ctx = BN_CTX_new()) == NULL)
2040                                 {
2041                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2042                                     ERR_R_MALLOC_FAILURE);
2043                                 goto err;
2044                                 }
2045
2046                         /* Get encoded point length */
2047                         i = *p;
2048                         p += 1;
2049                         if (EC_POINT_oct2point(srvr_ecdh->group,
2050                             clnt_ecpoint, p, i, bn_ctx) == 0)
2051                                 {
2052                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2053                                     ERR_R_EC_LIB);
2054                                 goto err;
2055                                 }
2056                         /* p is pointing to somewhere in the buffer
2057                          * currently, so set it to the start
2058                          */
2059                         p=(unsigned char *)s->init_buf->data;
2060                         }
2061
2062                 /* Compute the shared pre-master secret */
2063                 i = ECDH_compute_key(p, clnt_ecpoint, srvr_ecdh);
2064                 if (i <= 0)
2065                         {
2066                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2067                             ERR_R_ECDH_LIB);
2068                         goto err;
2069                         }
2070
2071                 EVP_PKEY_free(clnt_pub_pkey);
2072                 EC_POINT_free(clnt_ecpoint);
2073                 if (srvr_ecdh != NULL)
2074                         {
2075                         srvr_ecdh->priv_key = NULL;
2076                         srvr_ecdh->group = NULL;
2077                         EC_KEY_free(srvr_ecdh);
2078                         }
2079                 BN_CTX_free(bn_ctx);
2080
2081                 /* Compute the master secret */
2082                 s->session->master_key_length = s->method->ssl3_enc-> \
2083                     generate_master_secret(s, s->session->master_key, p, i);
2084
2085                 memset(p, 0, i);
2086                 return (ret);
2087                 }
2088         else
2089 #endif
2090                 {
2091                 al=SSL_AD_HANDSHAKE_FAILURE;
2092                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2093                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2094                 goto f_err;
2095                 }
2096
2097         return(1);
2098 f_err:
2099         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2100 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2101 err:
2102 #endif
2103 #ifndef NO_OPENSSL_ECDH
2104         EVP_PKEY_free(clnt_pub_pkey);
2105         EC_POINT_free(clnt_ecpoint);
2106         if (srvr_ecdh != NULL)
2107                 {
2108                 srvr_ecdh->priv_key = NULL;
2109                 srvr_ecdh->group = NULL;
2110                 EC_KEY_free(srvr_ecdh);
2111                 }
2112         BN_CTX_free(bn_ctx);
2113 #endif
2114         return(-1);
2115         }
2116
2117 static int ssl3_get_cert_verify(SSL *s)
2118         {
2119         EVP_PKEY *pkey=NULL;
2120         unsigned char *p;
2121         int al,ok,ret=0;
2122         long n;
2123         int type=0,i,j;
2124         X509 *peer;
2125
2126         n=ssl3_get_message(s,
2127                 SSL3_ST_SR_CERT_VRFY_A,
2128                 SSL3_ST_SR_CERT_VRFY_B,
2129                 -1,
2130                 514, /* 514? */
2131                 &ok);
2132
2133         if (!ok) return((int)n);
2134
2135         if (s->session->peer != NULL)
2136                 {
2137                 peer=s->session->peer;
2138                 pkey=X509_get_pubkey(peer);
2139                 type=X509_certificate_type(peer,pkey);
2140                 }
2141         else
2142                 {
2143                 peer=NULL;
2144                 pkey=NULL;
2145                 }
2146
2147         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2148                 {
2149                 s->s3->tmp.reuse_message=1;
2150                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2151                         {
2152                         al=SSL_AD_UNEXPECTED_MESSAGE;
2153                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2154                         goto f_err;
2155                         }
2156                 ret=1;
2157                 goto end;
2158                 }
2159
2160         if (peer == NULL)
2161                 {
2162                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2163                 al=SSL_AD_UNEXPECTED_MESSAGE;
2164                 goto f_err;
2165                 }
2166
2167         if (!(type & EVP_PKT_SIGN))
2168                 {
2169                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2170                 al=SSL_AD_ILLEGAL_PARAMETER;
2171                 goto f_err;
2172                 }
2173
2174         if (s->s3->change_cipher_spec)
2175                 {
2176                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2177                 al=SSL_AD_UNEXPECTED_MESSAGE;
2178                 goto f_err;
2179                 }
2180
2181         /* we now have a signature that we need to verify */
2182         p=(unsigned char *)s->init_msg;
2183         n2s(p,i);
2184         n-=2;
2185         if (i > n)
2186                 {
2187                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2188                 al=SSL_AD_DECODE_ERROR;
2189                 goto f_err;
2190                 }
2191
2192         j=EVP_PKEY_size(pkey);
2193         if ((i > j) || (n > j) || (n <= 0))
2194                 {
2195                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2196                 al=SSL_AD_DECODE_ERROR;
2197                 goto f_err;
2198                 }
2199
2200 #ifndef OPENSSL_NO_RSA
2201         if (pkey->type == EVP_PKEY_RSA)
2202                 {
2203                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2204                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2205                                                         pkey->pkey.rsa);
2206                 if (i < 0)
2207                         {
2208                         al=SSL_AD_DECRYPT_ERROR;
2209                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2210                         goto f_err;
2211                         }
2212                 if (i == 0)
2213                         {
2214                         al=SSL_AD_DECRYPT_ERROR;
2215                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2216                         goto f_err;
2217                         }
2218                 }
2219         else
2220 #endif
2221 #ifndef OPENSSL_NO_DSA
2222                 if (pkey->type == EVP_PKEY_DSA)
2223                 {
2224                 j=DSA_verify(pkey->save_type,
2225                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2226                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2227                 if (j <= 0)
2228                         {
2229                         /* bad signature */
2230                         al=SSL_AD_DECRYPT_ERROR;
2231                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2232                         goto f_err;
2233                         }
2234                 }
2235         else
2236 #endif
2237 #ifndef OPENSSL_NO_ECDSA
2238                 if (pkey->type == EVP_PKEY_EC)
2239                 {
2240                 j=ECDSA_verify(pkey->save_type,
2241                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2242                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.eckey);
2243                 if (j <= 0)
2244                         {
2245                         /* bad signature */
2246                         al=SSL_AD_DECRYPT_ERROR;
2247                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2248                             SSL_R_BAD_ECDSA_SIGNATURE);
2249                         goto f_err;
2250                         }
2251                 }
2252         else
2253 #endif
2254                 {
2255                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2256                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2257                 goto f_err;
2258                 }
2259
2260
2261         ret=1;
2262         if (0)
2263                 {
2264 f_err:
2265                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2266                 }
2267 end:
2268         EVP_PKEY_free(pkey);
2269         return(ret);
2270         }
2271
2272 static int ssl3_get_client_certificate(SSL *s)
2273         {
2274         int i,ok,al,ret= -1;
2275         X509 *x=NULL;
2276         unsigned long l,nc,llen,n;
2277         unsigned char *p,*d,*q;
2278         STACK_OF(X509) *sk=NULL;
2279
2280         n=ssl3_get_message(s,
2281                 SSL3_ST_SR_CERT_A,
2282                 SSL3_ST_SR_CERT_B,
2283                 -1,
2284                 s->max_cert_list,
2285                 &ok);
2286
2287         if (!ok) return((int)n);
2288
2289         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2290                 {
2291                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2292                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2293                         {
2294                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2295                         al=SSL_AD_HANDSHAKE_FAILURE;
2296                         goto f_err;
2297                         }
2298                 /* If tls asked for a client cert, the client must return a 0 list */
2299                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2300                         {
2301                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2302                         al=SSL_AD_UNEXPECTED_MESSAGE;
2303                         goto f_err;
2304                         }
2305                 s->s3->tmp.reuse_message=1;
2306                 return(1);
2307                 }
2308
2309         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2310                 {
2311                 al=SSL_AD_UNEXPECTED_MESSAGE;
2312                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2313                 goto f_err;
2314                 }
2315         d=p=(unsigned char *)s->init_msg;
2316
2317         if ((sk=sk_X509_new_null()) == NULL)
2318                 {
2319                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2320                 goto err;
2321                 }
2322
2323         n2l3(p,llen);
2324         if (llen+3 != n)
2325                 {
2326                 al=SSL_AD_DECODE_ERROR;
2327                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2328                 goto f_err;
2329                 }
2330         for (nc=0; nc<llen; )
2331                 {
2332                 n2l3(p,l);
2333                 if ((l+nc+3) > llen)
2334                         {
2335                         al=SSL_AD_DECODE_ERROR;
2336                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2337                         goto f_err;
2338                         }
2339
2340                 q=p;
2341                 x=d2i_X509(NULL,&p,l);
2342                 if (x == NULL)
2343                         {
2344                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2345                         goto err;
2346                         }
2347                 if (p != (q+l))
2348                         {
2349                         al=SSL_AD_DECODE_ERROR;
2350                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2351                         goto f_err;
2352                         }
2353                 if (!sk_X509_push(sk,x))
2354                         {
2355                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2356                         goto err;
2357                         }
2358                 x=NULL;
2359                 nc+=l+3;
2360                 }
2361
2362         if (sk_X509_num(sk) <= 0)
2363                 {
2364                 /* TLS does not mind 0 certs returned */
2365                 if (s->version == SSL3_VERSION)
2366                         {
2367                         al=SSL_AD_HANDSHAKE_FAILURE;
2368                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2369                         goto f_err;
2370                         }
2371                 /* Fail for TLS only if we required a certificate */
2372                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2373                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2374                         {
2375                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2376                         al=SSL_AD_HANDSHAKE_FAILURE;
2377                         goto f_err;
2378                         }
2379                 }
2380         else
2381                 {
2382                 i=ssl_verify_cert_chain(s,sk);
2383                 if (!i)
2384                         {
2385                         al=ssl_verify_alarm_type(s->verify_result);
2386                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2387                         goto f_err;
2388                         }
2389                 }
2390
2391         if (s->session->peer != NULL) /* This should not be needed */
2392                 X509_free(s->session->peer);
2393         s->session->peer=sk_X509_shift(sk);
2394         s->session->verify_result = s->verify_result;
2395
2396         /* With the current implementation, sess_cert will always be NULL
2397          * when we arrive here. */
2398         if (s->session->sess_cert == NULL)
2399                 {
2400                 s->session->sess_cert = ssl_sess_cert_new();
2401                 if (s->session->sess_cert == NULL)
2402                         {
2403                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2404                         goto err;
2405                         }
2406                 }
2407         if (s->session->sess_cert->cert_chain != NULL)
2408                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2409         s->session->sess_cert->cert_chain=sk;
2410         /* Inconsistency alert: cert_chain does *not* include the
2411          * peer's own certificate, while we do include it in s3_clnt.c */
2412
2413         sk=NULL;
2414
2415         ret=1;
2416         if (0)
2417                 {
2418 f_err:
2419                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2420                 }
2421 err:
2422         if (x != NULL) X509_free(x);
2423         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2424         return(ret);
2425         }
2426
2427 int ssl3_send_server_certificate(SSL *s)
2428         {
2429         unsigned long l;
2430         X509 *x;
2431
2432         if (s->state == SSL3_ST_SW_CERT_A)
2433                 {
2434                 x=ssl_get_server_send_cert(s);
2435                 if (x == NULL &&
2436                         /* VRS: allow null cert if auth == KRB5 */
2437                         (s->s3->tmp.new_cipher->algorithms
2438                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2439                         != (SSL_aKRB5|SSL_kKRB5))
2440                         {
2441                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2442                         return(0);
2443                         }
2444
2445                 l=ssl3_output_cert_chain(s,x);
2446                 s->state=SSL3_ST_SW_CERT_B;
2447                 s->init_num=(int)l;
2448                 s->init_off=0;
2449                 }
2450
2451         /* SSL3_ST_SW_CERT_B */
2452         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2453         }
2454
2455
2456 #ifndef OPENSSL_NO_ECDH
2457 /* This is the complement of curve_id2nid in s3_clnt.c. */
2458 static int nid2curve_id(int nid)
2459 {
2460         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001) */
2461         switch (nid) {
2462         case NID_sect163k1: /* sect163k1 (1) */
2463                 return 1;
2464         case NID_sect163r1: /* sect163r1 (2) */
2465                 return 2;
2466         case NID_sect163r2: /* sect163r2 (3) */
2467                 return 3;
2468         case NID_sect193r1: /* sect193r1 (4) */
2469                 return 4;
2470         case NID_sect193r2: /* sect193r2 (5) */
2471                 return 5;
2472         case NID_sect233k1: /* sect233k1 (6) */
2473                 return 6;
2474         case NID_sect233r1: /* sect233r1 (7) */
2475                 return 7;
2476         case NID_sect239k1: /* sect239k1 (8) */
2477                 return 8;
2478         case NID_sect283k1: /* sect283k1 (9) */
2479                 return 9;
2480         case NID_sect283r1: /* sect283r1 (10) */
2481                 return 10;
2482         case NID_sect409k1: /* sect409k1 (11) */
2483                 return 11;
2484         case NID_sect409r1: /* sect409r1 (12) */
2485                 return 12;
2486         case NID_sect571k1: /* sect571k1 (13) */
2487                 return 13;
2488         case NID_sect571r1: /* sect571r1 (14) */
2489                 return 14;
2490         case NID_secp160k1: /* secp160k1 (15) */
2491                 return 15;
2492         case NID_secp160r1: /* secp160r1 (16) */
2493                 return 16;
2494         case NID_secp160r2: /* secp160r2 (17) */
2495                 return 17;
2496         case NID_secp192k1: /* secp192k1 (18) */
2497                 return 18;
2498         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2499                 return 19;
2500         case NID_secp224k1: /* secp224k1 (20) */
2501                 return 20;
2502         case NID_secp224r1: /* secp224r1 (21) */
2503                 return 21;
2504         case NID_secp256k1: /* secp256k1 (22) */
2505                 return 22;
2506         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2507                 return 23;
2508         case NID_secp384r1: /* secp384r1 (24) */
2509                 return 24;
2510         case NID_secp521r1:  /* secp521r1 (25) */
2511                 return 25;
2512         default:
2513                 return 0;
2514         }
2515 }
2516 #endif