ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2002 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 #include <stdio.h>
 113 #include "ssl_locl.h"
 114 #include "kssl_lcl.h"
 115 #include <openssl/buffer.h>
 116 #include <openssl/rand.h>
 117 #include <openssl/objects.h>
 118 #include <openssl/evp.h>
 119 #include <openssl/md5.h>
 120 #include <openssl/fips.h>
 121
 122 static SSL_METHOD *ssl3_get_client_method(int ver);
 123 static int ssl3_client_hello(SSL *s);
 124 static int ssl3_get_server_hello(SSL *s);
 125 static int ssl3_get_certificate_request(SSL *s);
 126 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 127 static int ssl3_get_server_done(SSL *s);
 128 static int ssl3_send_client_verify(SSL *s);
 129 static int ssl3_send_client_certificate(SSL *s);
 130 static int ssl3_send_client_key_exchange(SSL *s);
 131 static int ssl3_get_key_exchange(SSL *s);
 132 static int ssl3_get_server_certificate(SSL *s);
 133 static int ssl3_check_cert_and_algorithm(SSL *s);
 134 static SSL_METHOD *ssl3_get_client_method(int ver)
 135         {
 136         if (ver == SSL3_VERSION)
 137                 return(SSLv3_client_method());
 138         else
 139                 return(NULL);
 140         }
 141
 142 SSL_METHOD *SSLv3_client_method(void)
 143         {
 144         static int init=1;
 145         static SSL_METHOD SSLv3_client_data;
 146
 147         if (init)
 148                 {
 149                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 150
 151                 if (init)
 152                         {
 153                         memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
 154                                 sizeof(SSL_METHOD));
 155                         SSLv3_client_data.ssl_connect=ssl3_connect;
 156                         SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
 157                         init=0;
 158                         }
 159
 160                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 161                 }
 162         return(&SSLv3_client_data);
 163         }
 164
 165 int ssl3_connect(SSL *s)
 166         {
 167         BUF_MEM *buf=NULL;
 168         unsigned long Time=time(NULL),l;
 169         long num1;
 170         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 171         int ret= -1;
 172         int new_state,state,skip=0;;
 173
 174         RAND_add(&Time,sizeof(Time),0);
 175         ERR_clear_error();
 176         clear_sys_error();
 177
 178         if (s->info_callback != NULL)
 179                 cb=s->info_callback;
 180         else if (s->ctx->info_callback != NULL)
 181                 cb=s->ctx->info_callback;
 182
 183         s->in_handshake++;
 184         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 185
 186         for (;;)
 187                 {
 188                 state=s->state;
 189
 190                 switch(s->state)
 191                         {
 192                 case SSL_ST_RENEGOTIATE:
 193                         s->new_session=1;
 194                         s->state=SSL_ST_CONNECT;
 195                         s->ctx->stats.sess_connect_renegotiate++;
 196                         /* break */
 197                 case SSL_ST_BEFORE:
 198                 case SSL_ST_CONNECT:
 199                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 200                 case SSL_ST_OK|SSL_ST_CONNECT:
 201
 202                         s->server=0;
 203                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 204
 205                         if ((s->version & 0xff00 ) != 0x0300)
 206                                 {
 207                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 208                                 ret = -1;
 209                                 goto end;
 210                                 }
 211
 212                         /* s->version=SSL3_VERSION; */
 213                         s->type=SSL_ST_CONNECT;
 214
 215                         if (s->init_buf == NULL)
 216                                 {
 217                                 if ((buf=BUF_MEM_new()) == NULL)
 218                                         {
 219                                         ret= -1;
 220                                         goto end;
 221                                         }
 222                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 223                                         {
 224                                         ret= -1;
 225                                         goto end;
 226                                         }
 227                                 s->init_buf=buf;
 228                                 buf=NULL;
 229                                 }
 230
 231                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 232
 233                         /* setup buffing BIO */
 234                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 235
 236                         /* don't push the buffering BIO quite yet */
 237
 238                         ssl3_init_finished_mac(s);
 239
 240                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 241                         s->ctx->stats.sess_connect++;
 242                         s->init_num=0;
 243                         break;
 244
 245                 case SSL3_ST_CW_CLNT_HELLO_A:
 246                 case SSL3_ST_CW_CLNT_HELLO_B:
 247
 248                         s->shutdown=0;
 249                         ret=ssl3_client_hello(s);
 250                         if (ret <= 0) goto end;
 251                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 252                         s->init_num=0;
 253
 254                         /* turn on buffering for the next lot of output */
 255                         if (s->bbio != s->wbio)
 256                                 s->wbio=BIO_push(s->bbio,s->wbio);
 257
 258                         break;
 259
 260                 case SSL3_ST_CR_SRVR_HELLO_A:
 261                 case SSL3_ST_CR_SRVR_HELLO_B:
 262                         ret=ssl3_get_server_hello(s);
 263                         if (ret <= 0) goto end;
 264                         if (s->hit)
 265                                 s->state=SSL3_ST_CR_FINISHED_A;
 266                         else
 267                                 s->state=SSL3_ST_CR_CERT_A;
 268                         s->init_num=0;
 269                         break;
 270
 271                 case SSL3_ST_CR_CERT_A:
 272                 case SSL3_ST_CR_CERT_B:
 273                         /* Check if it is anon DH */
 274                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 275                                 {
 276                                 ret=ssl3_get_server_certificate(s);
 277                                 if (ret <= 0) goto end;
 278                                 }
 279                         else
 280                                 skip=1;
 281                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 282                         s->init_num=0;
 283                         break;
 284
 285                 case SSL3_ST_CR_KEY_EXCH_A:
 286                 case SSL3_ST_CR_KEY_EXCH_B:
 287                         ret=ssl3_get_key_exchange(s);
 288                         if (ret <= 0) goto end;
 289                         s->state=SSL3_ST_CR_CERT_REQ_A;
 290                         s->init_num=0;
 291
 292                         /* at this point we check that we have the
 293                          * required stuff from the server */
 294                         if (!ssl3_check_cert_and_algorithm(s))
 295                                 {
 296                                 ret= -1;
 297                                 goto end;
 298                                 }
 299                         break;
 300
 301                 case SSL3_ST_CR_CERT_REQ_A:
 302                 case SSL3_ST_CR_CERT_REQ_B:
 303                         ret=ssl3_get_certificate_request(s);
 304                         if (ret <= 0) goto end;
 305                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 306                         s->init_num=0;
 307                         break;
 308
 309                 case SSL3_ST_CR_SRVR_DONE_A:
 310                 case SSL3_ST_CR_SRVR_DONE_B:
 311                         ret=ssl3_get_server_done(s);
 312                         if (ret <= 0) goto end;
 313                         if (s->s3->tmp.cert_req)
 314                                 s->state=SSL3_ST_CW_CERT_A;
 315                         else
 316                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 317                         s->init_num=0;
 318
 319                         break;
 320
 321                 case SSL3_ST_CW_CERT_A:
 322                 case SSL3_ST_CW_CERT_B:
 323                 case SSL3_ST_CW_CERT_C:
 324                 case SSL3_ST_CW_CERT_D:
 325                         ret=ssl3_send_client_certificate(s);
 326                         if (ret <= 0) goto end;
 327                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 328                         s->init_num=0;
 329                         break;
 330
 331                 case SSL3_ST_CW_KEY_EXCH_A:
 332                 case SSL3_ST_CW_KEY_EXCH_B:
 333                         ret=ssl3_send_client_key_exchange(s);
 334                         if (ret <= 0) goto end;
 335                         l=s->s3->tmp.new_cipher->algorithms;
 336                         /* EAY EAY EAY need to check for DH fix cert
 337                          * sent back */
 338                         /* For TLS, cert_req is set to 2, so a cert chain
 339                          * of nothing is sent, but no verify packet is sent */
 340                         if (s->s3->tmp.cert_req == 1)
 341                                 {
 342                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 343                                 }
 344                         else
 345                                 {
 346                                 s->state=SSL3_ST_CW_CHANGE_A;
 347                                 s->s3->change_cipher_spec=0;
 348                                 }
 349
 350                         s->init_num=0;
 351                         break;
 352
 353                 case SSL3_ST_CW_CERT_VRFY_A:
 354                 case SSL3_ST_CW_CERT_VRFY_B:
 355                         ret=ssl3_send_client_verify(s);
 356                         if (ret <= 0) goto end;
 357                         s->state=SSL3_ST_CW_CHANGE_A;
 358                         s->init_num=0;
 359                         s->s3->change_cipher_spec=0;
 360                         break;
 361
 362                 case SSL3_ST_CW_CHANGE_A:
 363                 case SSL3_ST_CW_CHANGE_B:
 364                         ret=ssl3_send_change_cipher_spec(s,
 365                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 366                         if (ret <= 0) goto end;
 367                         s->state=SSL3_ST_CW_FINISHED_A;
 368                         s->init_num=0;
 369
 370                         s->session->cipher=s->s3->tmp.new_cipher;
 371                         if (s->s3->tmp.new_compression == NULL)
 372                                 s->session->compress_meth=0;
 373                         else
 374                                 s->session->compress_meth=
 375                                         s->s3->tmp.new_compression->id;
 376                         if (!s->method->ssl3_enc->setup_key_block(s))
 377                                 {
 378                                 ret= -1;
 379                                 goto end;
 380                                 }
 381
 382                         if (!s->method->ssl3_enc->change_cipher_state(s,
 383                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 384                                 {
 385                                 ret= -1;
 386                                 goto end;
 387                                 }
 388
 389                         break;
 390
 391                 case SSL3_ST_CW_FINISHED_A:
 392                 case SSL3_ST_CW_FINISHED_B:
 393                         ret=ssl3_send_finished(s,
 394                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 395                                 s->method->ssl3_enc->client_finished_label,
 396                                 s->method->ssl3_enc->client_finished_label_len);
 397                         if (ret <= 0) goto end;
 398                         s->state=SSL3_ST_CW_FLUSH;
 399
 400                         /* clear flags */
 401                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 402                         if (s->hit)
 403                                 {
 404                                 s->s3->tmp.next_state=SSL_ST_OK;
 405                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 406                                         {
 407                                         s->state=SSL_ST_OK;
 408                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 409                                         s->s3->delay_buf_pop_ret=0;
 410                                         }
 411                                 }
 412                         else
 413                                 {
 414                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 415                                 }
 416                         s->init_num=0;
 417                         break;
 418
 419                 case SSL3_ST_CR_FINISHED_A:
 420                 case SSL3_ST_CR_FINISHED_B:
 421
 422                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 423                                 SSL3_ST_CR_FINISHED_B);
 424                         if (ret <= 0) goto end;
 425
 426                         if (s->hit)
 427                                 s->state=SSL3_ST_CW_CHANGE_A;
 428                         else
 429                                 s->state=SSL_ST_OK;
 430                         s->init_num=0;
 431                         break;
 432
 433                 case SSL3_ST_CW_FLUSH:
 434                         /* number of bytes to be flushed */
 435                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 436                         if (num1 > 0)
 437                                 {
 438                                 s->rwstate=SSL_WRITING;
 439                                 num1=BIO_flush(s->wbio);
 440                                 if (num1 <= 0) { ret= -1; goto end; }
 441                                 s->rwstate=SSL_NOTHING;
 442                                 }
 443
 444                         s->state=s->s3->tmp.next_state;
 445                         break;
 446
 447                 case SSL_ST_OK:
 448                         /* clean a few things up */
 449                         ssl3_cleanup_key_block(s);
 450
 451                         if (s->init_buf != NULL)
 452                                 {
 453                                 BUF_MEM_free(s->init_buf);
 454                                 s->init_buf=NULL;
 455                                 }
 456
 457                         /* If we are not 'joining' the last two packets,
 458                          * remove the buffering now */
 459                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 460                                 ssl_free_wbio_buffer(s);
 461                         /* else do it later in ssl3_write */
 462
 463                         s->init_num=0;
 464                         s->new_session=0;
 465
 466                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 467                         if (s->hit) s->ctx->stats.sess_hit++;
 468
 469                         ret=1;
 470                         /* s->server=0; */
 471                         s->handshake_func=ssl3_connect;
 472                         s->ctx->stats.sess_connect_good++;
 473
 474                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 475
 476                         goto end;
 477                         /* break; */
 478
 479                 default:
 480                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 481                         ret= -1;
 482                         goto end;
 483                         /* break; */
 484                         }
 485
 486                 /* did we do anything */
 487                 if (!s->s3->tmp.reuse_message && !skip)
 488                         {
 489                         if (s->debug)
 490                                 {
 491                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 492                                         goto end;
 493                                 }
 494
 495                         if ((cb != NULL) && (s->state != state))
 496                                 {
 497                                 new_state=s->state;
 498                                 s->state=state;
 499                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 500                                 s->state=new_state;
 501                                 }
 502                         }
 503                 skip=0;
 504                 }
 505 end:
 506         s->in_handshake--;
 507         if (buf != NULL)
 508                 BUF_MEM_free(buf);
 509         if (cb != NULL)
 510                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 511         return(ret);
 512         }
 513
 514
 515 static int ssl3_client_hello(SSL *s)
 516         {
 517         unsigned char *buf;
 518         unsigned char *p,*d;
 519         int i,j;
 520         unsigned long Time,l;
 521         SSL_COMP *comp;
 522
 523         buf=(unsigned char *)s->init_buf->data;
 524         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 525                 {
 526                 if ((s->session == NULL) ||
 527                         (s->session->ssl_version != s->version) ||
 528                         (s->session->not_resumable))
 529                         {
 530                         if (!ssl_get_new_session(s,0))
 531                                 goto err;
 532                         }
 533                 /* else use the pre-loaded session */
 534
 535                 p=s->s3->client_random;
 536                 Time=time(NULL);                        /* Time */
 537                 l2n(Time,p);
 538                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 539
 540                 /* Do the message type and length last */
 541                 d=p= &(buf[4]);
 542
 543                 *(p++)=s->version>>8;
 544                 *(p++)=s->version&0xff;
 545                 s->client_version=s->version;
 546
 547                 /* Random stuff */
 548                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 549                 p+=SSL3_RANDOM_SIZE;
 550
 551                 /* Session ID */
 552                 if (s->new_session)
 553                         i=0;
 554                 else
 555                         i=s->session->session_id_length;
 556                 *(p++)=i;
 557                 if (i != 0)
 558                         {
 559                         if (i > sizeof s->session->session_id)
 560                                 {
 561                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 562                                 goto err;
 563                                 }
 564                         memcpy(p,s->session->session_id,i);
 565                         p+=i;
 566                         }
 567
 568                 /* Ciphers supported */
 569                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 570                 if (i == 0)
 571                         {
 572                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 573                         goto err;
 574                         }
 575                 s2n(i,p);
 576                 p+=i;
 577
 578                 /* COMPRESSION */
 579                 if (s->ctx->comp_methods == NULL)
 580                         j=0;
 581                 else
 582                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 583                 *(p++)=1+j;
 584                 for (i=0; i<j; i++)
 585                         {
 586                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 587                         *(p++)=comp->id;
 588                         }
 589                 *(p++)=0; /* Add the NULL method */
 590
 591                 l=(p-d);
 592                 d=buf;
 593                 *(d++)=SSL3_MT_CLIENT_HELLO;
 594                 l2n3(l,d);
 595
 596                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 597                 /* number of bytes to write */
 598                 s->init_num=p-buf;
 599                 s->init_off=0;
 600                 }
 601
 602         /* SSL3_ST_CW_CLNT_HELLO_B */
 603         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 604 err:
 605         return(-1);
 606         }
 607
 608 static int ssl3_get_server_hello(SSL *s)
 609         {
 610         STACK_OF(SSL_CIPHER) *sk;
 611         SSL_CIPHER *c;
 612         unsigned char *p,*d;
 613         int i,al,ok;
 614         unsigned int j;
 615         long n;
 616         SSL_COMP *comp;
 617
 618         n=ssl3_get_message(s,
 619                 SSL3_ST_CR_SRVR_HELLO_A,
 620                 SSL3_ST_CR_SRVR_HELLO_B,
 621                 SSL3_MT_SERVER_HELLO,
 622                 300, /* ?? */
 623                 &ok);
 624
 625         if (!ok) return((int)n);
 626         d=p=(unsigned char *)s->init_msg;
 627
 628         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 629                 {
 630                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 631                 s->version=(s->version&0xff00)|p[1];
 632                 al=SSL_AD_PROTOCOL_VERSION;
 633                 goto f_err;
 634                 }
 635         p+=2;
 636
 637         /* load the server hello data */
 638         /* load the server random */
 639         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 640         p+=SSL3_RANDOM_SIZE;
 641
 642         /* get the session-id */
 643         j= *(p++);
 644
 645         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 646                 {
 647                 al=SSL_AD_ILLEGAL_PARAMETER;
 648                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 649                 goto f_err;
 650                 }
 651
 652         if (j != 0 && j == s->session->session_id_length
 653             && memcmp(p,s->session->session_id,j) == 0)
 654             {
 655             if(s->sid_ctx_length != s->session->sid_ctx_length
 656                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 657                 {
 658                 /* actually a client application bug */
 659                 al=SSL_AD_ILLEGAL_PARAMETER;
 660                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 661                 goto f_err;
 662                 }
 663             s->hit=1;
 664             }
 665         else    /* a miss or crap from the other end */
 666                 {
 667                 /* If we were trying for session-id reuse, make a new
 668                  * SSL_SESSION so we don't stuff up other people */
 669                 s->hit=0;
 670                 if (s->session->session_id_length > 0)
 671                         {
 672                         if (!ssl_get_new_session(s,0))
 673                                 {
 674                                 al=SSL_AD_INTERNAL_ERROR;
 675                                 goto f_err;
 676                                 }
 677                         }
 678                 s->session->session_id_length=j;
 679                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 680                 }
 681         p+=j;
 682         c=ssl_get_cipher_by_char(s,p);
 683         if (c == NULL)
 684                 {
 685                 /* unknown cipher */
 686                 al=SSL_AD_ILLEGAL_PARAMETER;
 687                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 688                 goto f_err;
 689                 }
 690         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 691
 692         sk=ssl_get_ciphers_by_id(s);
 693         i=sk_SSL_CIPHER_find(sk,c);
 694         if (i < 0)
 695                 {
 696                 /* we did not say we would use this cipher */
 697                 al=SSL_AD_ILLEGAL_PARAMETER;
 698                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 699                 goto f_err;
 700                 }
 701
 702         /* Depending on the session caching (internal/external), the cipher
 703            and/or cipher_id values may not be set. Make sure that
 704            cipher_id is set and use it for comparison. */
 705         if (s->session->cipher)
 706                 s->session->cipher_id = s->session->cipher->id;
 707         if (s->hit && (s->session->cipher_id != c->id))
 708                 {
 709                 if (!(s->options &
 710                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 711                         {
 712                         al=SSL_AD_ILLEGAL_PARAMETER;
 713                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 714                         goto f_err;
 715                         }
 716                 }
 717         s->s3->tmp.new_cipher=c;
 718
 719         /* lets get the compression algorithm */
 720         /* COMPRESSION */
 721         j= *(p++);
 722         if (j == 0)
 723                 comp=NULL;
 724         else
 725                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 726
 727         if ((j != 0) && (comp == NULL))
 728                 {
 729                 al=SSL_AD_ILLEGAL_PARAMETER;
 730                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 731                 goto f_err;
 732                 }
 733         else
 734                 {
 735                 s->s3->tmp.new_compression=comp;
 736                 }
 737
 738         if (p != (d+n))
 739                 {
 740                 /* wrong packet length */
 741                 al=SSL_AD_DECODE_ERROR;
 742                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 743                 goto err;
 744                 }
 745
 746         return(1);
 747 f_err:
 748         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 749 err:
 750         return(-1);
 751         }
 752
 753 static int ssl3_get_server_certificate(SSL *s)
 754         {
 755         int al,i,ok,ret= -1;
 756         unsigned long n,nc,llen,l;
 757         X509 *x=NULL;
 758         unsigned char *p,*d,*q;
 759         STACK_OF(X509) *sk=NULL;
 760         SESS_CERT *sc;
 761         EVP_PKEY *pkey=NULL;
 762         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 763
 764         n=ssl3_get_message(s,
 765                 SSL3_ST_CR_CERT_A,
 766                 SSL3_ST_CR_CERT_B,
 767                 -1,
 768                 s->max_cert_list,
 769                 &ok);
 770
 771         if (!ok) return((int)n);
 772
 773         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 774                 {
 775                 s->s3->tmp.reuse_message=1;
 776                 return(1);
 777                 }
 778
 779         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 780                 {
 781                 al=SSL_AD_UNEXPECTED_MESSAGE;
 782                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 783                 goto f_err;
 784                 }
 785         d=p=(unsigned char *)s->init_msg;
 786
 787         if ((sk=sk_X509_new_null()) == NULL)
 788                 {
 789                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 790                 goto err;
 791                 }
 792
 793         n2l3(p,llen);
 794         if (llen+3 != n)
 795                 {
 796                 al=SSL_AD_DECODE_ERROR;
 797                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 798                 goto f_err;
 799                 }
 800         for (nc=0; nc<llen; )
 801                 {
 802                 n2l3(p,l);
 803                 if ((l+nc+3) > llen)
 804                         {
 805                         al=SSL_AD_DECODE_ERROR;
 806                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 807                         goto f_err;
 808                         }
 809
 810                 q=p;
 811                 x=d2i_X509(NULL,&q,l);
 812                 if (x == NULL)
 813                         {
 814                         al=SSL_AD_BAD_CERTIFICATE;
 815                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 816                         goto f_err;
 817                         }
 818                 if (q != (p+l))
 819                         {
 820                         al=SSL_AD_DECODE_ERROR;
 821                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 822                         goto f_err;
 823                         }
 824                 if (!sk_X509_push(sk,x))
 825                         {
 826                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 827                         goto err;
 828                         }
 829                 x=NULL;
 830                 nc+=l+3;
 831                 p=q;
 832                 }
 833
 834         i=ssl_verify_cert_chain(s,sk);
 835         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 836 #ifndef OPENSSL_NO_KRB5
 837                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 838                 != (SSL_aKRB5|SSL_kKRB5)
 839 #endif /* OPENSSL_NO_KRB5 */
 840                 )
 841                 {
 842                 al=ssl_verify_alarm_type(s->verify_result);
 843                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 844                 goto f_err;
 845                 }
 846         ERR_clear_error(); /* but we keep s->verify_result */
 847
 848         sc=ssl_sess_cert_new();
 849         if (sc == NULL) goto err;
 850
 851         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 852         s->session->sess_cert=sc;
 853
 854         sc->cert_chain=sk;
 855         /* Inconsistency alert: cert_chain does include the peer's
 856          * certificate, which we don't include in s3_srvr.c */
 857         x=sk_X509_value(sk,0);
 858         sk=NULL;
 859         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 860
 861         pkey=X509_get_pubkey(x);
 862
 863         /* VRS: allow null cert if auth == KRB5 */
 864         need_cert =     ((s->s3->tmp.new_cipher->algorithms
 865                         & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 866                         == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 867
 868 #ifdef KSSL_DEBUG
 869         printf("pkey,x = %p, %p\n", pkey,x);
 870         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 871         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 872                 s->s3->tmp.new_cipher->algorithms, need_cert);
 873 #endif    /* KSSL_DEBUG */
 874
 875         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 876                 {
 877                 x=NULL;
 878                 al=SSL3_AL_FATAL;
 879                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 880                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 881                 goto f_err;
 882                 }
 883
 884         i=ssl_cert_type(x,pkey);
 885         if (need_cert && i < 0)
 886                 {
 887                 x=NULL;
 888                 al=SSL3_AL_FATAL;
 889                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 890                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 891                 goto f_err;
 892                 }
 893
 894         if (need_cert)
 895                 {
 896                 sc->peer_cert_type=i;
 897                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 898                 /* Why would the following ever happen?
 899                  * We just created sc a couple of lines ago. */
 900                 if (sc->peer_pkeys[i].x509 != NULL)
 901                         X509_free(sc->peer_pkeys[i].x509);
 902                 sc->peer_pkeys[i].x509=x;
 903                 sc->peer_key= &(sc->peer_pkeys[i]);
 904
 905                 if (s->session->peer != NULL)
 906                         X509_free(s->session->peer);
 907                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 908                 s->session->peer=x;
 909                 }
 910         else
 911                 {
 912                 sc->peer_cert_type=i;
 913                 sc->peer_key= NULL;
 914
 915                 if (s->session->peer != NULL)
 916                         X509_free(s->session->peer);
 917                 s->session->peer=NULL;
 918                 }
 919         s->session->verify_result = s->verify_result;
 920
 921         x=NULL;
 922         ret=1;
 923
 924         if (0)
 925                 {
 926 f_err:
 927                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 928                 }
 929 err:
 930         EVP_PKEY_free(pkey);
 931         X509_free(x);
 932         sk_X509_pop_free(sk,X509_free);
 933         return(ret);
 934         }
 935
 936 static int ssl3_get_key_exchange(SSL *s)
 937         {
 938 #ifndef OPENSSL_NO_RSA
 939         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 940 #endif
 941         EVP_MD_CTX md_ctx;
 942         unsigned char *param,*p;
 943         int al,i,j,param_len,ok;
 944         long n,alg;
 945         EVP_PKEY *pkey=NULL;
 946 #ifndef OPENSSL_NO_RSA
 947         RSA *rsa=NULL;
 948 #endif
 949 #ifndef OPENSSL_NO_DH
 950         DH *dh=NULL;
 951 #endif
 952
 953         /* use same message size as in ssl3_get_certificate_request()
 954          * as ServerKeyExchange message may be skipped */
 955         n=ssl3_get_message(s,
 956                 SSL3_ST_CR_KEY_EXCH_A,
 957                 SSL3_ST_CR_KEY_EXCH_B,
 958                 -1,
 959                 s->max_cert_list,
 960                 &ok);
 961
 962         if (!ok) return((int)n);
 963
 964         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 965                 {
 966                 s->s3->tmp.reuse_message=1;
 967                 return(1);
 968                 }
 969
 970         param=p=(unsigned char *)s->init_msg;
 971
 972         if (s->session->sess_cert != NULL)
 973                 {
 974 #ifndef OPENSSL_NO_RSA
 975                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
 976                         {
 977                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
 978                         s->session->sess_cert->peer_rsa_tmp=NULL;
 979                         }
 980 #endif
 981 #ifndef OPENSSL_NO_DH
 982                 if (s->session->sess_cert->peer_dh_tmp)
 983                         {
 984                         DH_free(s->session->sess_cert->peer_dh_tmp);
 985                         s->session->sess_cert->peer_dh_tmp=NULL;
 986                         }
 987 #endif
 988                 }
 989         else
 990                 {
 991                 s->session->sess_cert=ssl_sess_cert_new();
 992                 }
 993
 994         param_len=0;
 995         alg=s->s3->tmp.new_cipher->algorithms;
 996         EVP_MD_CTX_init(&md_ctx);
 997
 998 #ifndef OPENSSL_NO_RSA
 999         if (alg & SSL_kRSA)
1000                 {
1001                 if ((rsa=RSA_new()) == NULL)
1002                         {
1003                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1004                         goto err;
1005                         }
1006                 n2s(p,i);
1007                 param_len=i+2;
1008                 if (param_len > n)
1009                         {
1010                         al=SSL_AD_DECODE_ERROR;
1011                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1012                         goto f_err;
1013                         }
1014                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1015                         {
1016                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1017                         goto err;
1018                         }
1019                 p+=i;
1020
1021                 n2s(p,i);
1022                 param_len+=i+2;
1023                 if (param_len > n)
1024                         {
1025                         al=SSL_AD_DECODE_ERROR;
1026                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1027                         goto f_err;
1028                         }
1029                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1030                         {
1031                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1032                         goto err;
1033                         }
1034                 p+=i;
1035                 n-=param_len;
1036
1037                 /* this should be because we are using an export cipher */
1038                 if (alg & SSL_aRSA)
1039                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1040                 else
1041                         {
1042                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1043                         goto err;
1044                         }
1045                 s->session->sess_cert->peer_rsa_tmp=rsa;
1046                 rsa=NULL;
1047                 }
1048 #else /* OPENSSL_NO_RSA */
1049         if (0)
1050                 ;
1051 #endif
1052 #ifndef OPENSSL_NO_DH
1053         else if (alg & SSL_kEDH)
1054                 {
1055                 if ((dh=DH_new()) == NULL)
1056                         {
1057                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1058                         goto err;
1059                         }
1060                 n2s(p,i);
1061                 param_len=i+2;
1062                 if (param_len > n)
1063                         {
1064                         al=SSL_AD_DECODE_ERROR;
1065                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1066                         goto f_err;
1067                         }
1068                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1069                         {
1070                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1071                         goto err;
1072                         }
1073                 p+=i;
1074
1075                 n2s(p,i);
1076                 param_len+=i+2;
1077                 if (param_len > n)
1078                         {
1079                         al=SSL_AD_DECODE_ERROR;
1080                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1081                         goto f_err;
1082                         }
1083                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1084                         {
1085                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1086                         goto err;
1087                         }
1088                 p+=i;
1089
1090                 n2s(p,i);
1091                 param_len+=i+2;
1092                 if (param_len > n)
1093                         {
1094                         al=SSL_AD_DECODE_ERROR;
1095                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1096                         goto f_err;
1097                         }
1098                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1099                         {
1100                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1101                         goto err;
1102                         }
1103                 p+=i;
1104                 n-=param_len;
1105
1106 #ifndef OPENSSL_NO_RSA
1107                 if (alg & SSL_aRSA)
1108                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1109 #else
1110                 if (0)
1111                         ;
1112 #endif
1113 #ifndef OPENSSL_NO_DSA
1114                 else if (alg & SSL_aDSS)
1115                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1116 #endif
1117                 /* else anonymous DH, so no certificate or pkey. */
1118
1119                 s->session->sess_cert->peer_dh_tmp=dh;
1120                 dh=NULL;
1121                 }
1122         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1123                 {
1124                 al=SSL_AD_ILLEGAL_PARAMETER;
1125                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1126                 goto f_err;
1127                 }
1128 #endif /* !OPENSSL_NO_DH */
1129         if (alg & SSL_aFZA)
1130                 {
1131                 al=SSL_AD_HANDSHAKE_FAILURE;
1132                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1133                 goto f_err;
1134                 }
1135
1136
1137         /* p points to the next byte, there are 'n' bytes left */
1138
1139
1140         /* if it was signed, check the signature */
1141         if (pkey != NULL)
1142                 {
1143                 n2s(p,i);
1144                 n-=2;
1145                 j=EVP_PKEY_size(pkey);
1146
1147                 if ((i != n) || (n > j) || (n <= 0))
1148                         {
1149                         /* wrong packet length */
1150                         al=SSL_AD_DECODE_ERROR;
1151                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1152                         goto f_err;
1153                         }
1154
1155 #ifndef OPENSSL_NO_RSA
1156                 if (pkey->type == EVP_PKEY_RSA)
1157                         {
1158                         int num;
1159
1160                         j=0;
1161                         q=md_buf;
1162                         for (num=2; num > 0; num--)
1163                                 {
1164                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1165                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1166                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1167                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1168                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1169 #ifdef OPENSSL_FIPS
1170                                 if(s->version == TLS1_VERSION && num == 2)
1171                                         FIPS_allow_md5(1);
1172 #endif
1173
1174                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1175 #ifdef OPENSSL_FIPS
1176                                 if(s->version == TLS1_VERSION && num == 2)
1177                                         FIPS_allow_md5(1);
1178 #endif
1179                                 q+=i;
1180                                 j+=i;
1181                                 }
1182                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1183                                                                 pkey->pkey.rsa);
1184                         if (i < 0)
1185                                 {
1186                                 al=SSL_AD_DECRYPT_ERROR;
1187                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1188                                 goto f_err;
1189                                 }
1190                         if (i == 0)
1191                                 {
1192                                 /* bad signature */
1193                                 al=SSL_AD_DECRYPT_ERROR;
1194                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1195                                 goto f_err;
1196                                 }
1197                         }
1198                 else
1199 #endif
1200 #ifndef OPENSSL_NO_DSA
1201                         if (pkey->type == EVP_PKEY_DSA)
1202                         {
1203                         /* lets do DSS */
1204                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1205                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1206                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1207                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1208                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1209                                 {
1210                                 /* bad signature */
1211                                 al=SSL_AD_DECRYPT_ERROR;
1212                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1213                                 goto f_err;
1214                                 }
1215                         }
1216                 else
1217 #endif
1218                         {
1219                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1220                         goto err;
1221                         }
1222                 }
1223         else
1224                 {
1225                 /* still data left over */
1226                 if (!(alg & SSL_aNULL))
1227                         {
1228                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1229                         goto err;
1230                         }
1231                 if (n != 0)
1232                         {
1233                         al=SSL_AD_DECODE_ERROR;
1234                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1235                         goto f_err;
1236                         }
1237                 }
1238         EVP_PKEY_free(pkey);
1239         EVP_MD_CTX_cleanup(&md_ctx);
1240         return(1);
1241 f_err:
1242         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1243 err:
1244         EVP_PKEY_free(pkey);
1245 #ifndef OPENSSL_NO_RSA
1246         if (rsa != NULL)
1247                 RSA_free(rsa);
1248 #endif
1249 #ifndef OPENSSL_NO_DH
1250         if (dh != NULL)
1251                 DH_free(dh);
1252 #endif
1253         EVP_MD_CTX_cleanup(&md_ctx);
1254         return(-1);
1255         }
1256
1257 static int ssl3_get_certificate_request(SSL *s)
1258         {
1259         int ok,ret=0;
1260         unsigned long n,nc,l;
1261         unsigned int llen,ctype_num,i;
1262         X509_NAME *xn=NULL;
1263         unsigned char *p,*d,*q;
1264         STACK_OF(X509_NAME) *ca_sk=NULL;
1265
1266         n=ssl3_get_message(s,
1267                 SSL3_ST_CR_CERT_REQ_A,
1268                 SSL3_ST_CR_CERT_REQ_B,
1269                 -1,
1270                 s->max_cert_list,
1271                 &ok);
1272
1273         if (!ok) return((int)n);
1274
1275         s->s3->tmp.cert_req=0;
1276
1277         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1278                 {
1279                 s->s3->tmp.reuse_message=1;
1280                 return(1);
1281                 }
1282
1283         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1284                 {
1285                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1286                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1287                 goto err;
1288                 }
1289
1290         /* TLS does not like anon-DH with client cert */
1291         if (s->version > SSL3_VERSION)
1292                 {
1293                 l=s->s3->tmp.new_cipher->algorithms;
1294                 if (l & SSL_aNULL)
1295                         {
1296                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1297                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1298                         goto err;
1299                         }
1300                 }
1301
1302         d=p=(unsigned char *)s->init_msg;
1303
1304         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1305                 {
1306                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1307                 goto err;
1308                 }
1309
1310         /* get the certificate types */
1311         ctype_num= *(p++);
1312         if (ctype_num > SSL3_CT_NUMBER)
1313                 ctype_num=SSL3_CT_NUMBER;
1314         for (i=0; i<ctype_num; i++)
1315                 s->s3->tmp.ctype[i]= p[i];
1316         p+=ctype_num;
1317
1318         /* get the CA RDNs */
1319         n2s(p,llen);
1320 #if 0
1321 {
1322 FILE *out;
1323 out=fopen("/tmp/vsign.der","w");
1324 fwrite(p,1,llen,out);
1325 fclose(out);
1326 }
1327 #endif
1328
1329         if ((llen+ctype_num+2+1) != n)
1330                 {
1331                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1332                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1333                 goto err;
1334                 }
1335
1336         for (nc=0; nc<llen; )
1337                 {
1338                 n2s(p,l);
1339                 if ((l+nc+2) > llen)
1340                         {
1341                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1342                                 goto cont; /* netscape bugs */
1343                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1344                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1345                         goto err;
1346                         }
1347
1348                 q=p;
1349
1350                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1351                         {
1352                         /* If netscape tolerance is on, ignore errors */
1353                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1354                                 goto cont;
1355                         else
1356                                 {
1357                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1358                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1359                                 goto err;
1360                                 }
1361                         }
1362
1363                 if (q != (p+l))
1364                         {
1365                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1366                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1367                         goto err;
1368                         }
1369                 if (!sk_X509_NAME_push(ca_sk,xn))
1370                         {
1371                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1372                         goto err;
1373                         }
1374
1375                 p+=l;
1376                 nc+=l+2;
1377                 }
1378
1379         if (0)
1380                 {
1381 cont:
1382                 ERR_clear_error();
1383                 }
1384
1385         /* we should setup a certificate to return.... */
1386         s->s3->tmp.cert_req=1;
1387         s->s3->tmp.ctype_num=ctype_num;
1388         if (s->s3->tmp.ca_names != NULL)
1389                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1390         s->s3->tmp.ca_names=ca_sk;
1391         ca_sk=NULL;
1392
1393         ret=1;
1394 err:
1395         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1396         return(ret);
1397         }
1398
1399 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1400         {
1401         return(X509_NAME_cmp(*a,*b));
1402         }
1403
1404 static int ssl3_get_server_done(SSL *s)
1405         {
1406         int ok,ret=0;
1407         long n;
1408
1409         n=ssl3_get_message(s,
1410                 SSL3_ST_CR_SRVR_DONE_A,
1411                 SSL3_ST_CR_SRVR_DONE_B,
1412                 SSL3_MT_SERVER_DONE,
1413                 30, /* should be very small, like 0 :-) */
1414                 &ok);
1415
1416         if (!ok) return((int)n);
1417         if (n > 0)
1418                 {
1419                 /* should contain no data */
1420                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1421                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1422                 return -1;
1423                 }
1424         ret=1;
1425         return(ret);
1426         }
1427
1428 static int ssl3_send_client_key_exchange(SSL *s)
1429         {
1430         unsigned char *p,*d;
1431         int n;
1432         unsigned long l;
1433 #ifndef OPENSSL_NO_RSA
1434         unsigned char *q;
1435         EVP_PKEY *pkey=NULL;
1436 #endif
1437 #ifndef OPENSSL_NO_KRB5
1438         KSSL_ERR kssl_err;
1439 #endif /* OPENSSL_NO_KRB5 */
1440
1441         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1442                 {
1443                 d=(unsigned char *)s->init_buf->data;
1444                 p= &(d[4]);
1445
1446                 l=s->s3->tmp.new_cipher->algorithms;
1447
1448                 /* Fool emacs indentation */
1449                 if (0) {}
1450 #ifndef OPENSSL_NO_RSA
1451                 else if (l & SSL_kRSA)
1452                         {
1453                         RSA *rsa;
1454                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1455
1456                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1457                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1458                         else
1459                                 {
1460                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1461                                 if ((pkey == NULL) ||
1462                                         (pkey->type != EVP_PKEY_RSA) ||
1463                                         (pkey->pkey.rsa == NULL))
1464                                         {
1465                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1466                                         goto err;
1467                                         }
1468                                 rsa=pkey->pkey.rsa;
1469                                 EVP_PKEY_free(pkey);
1470                                 }
1471
1472                         tmp_buf[0]=s->client_version>>8;
1473                         tmp_buf[1]=s->client_version&0xff;
1474                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1475                                         goto err;
1476
1477                         s->session->master_key_length=sizeof tmp_buf;
1478
1479                         q=p;
1480                         /* Fix buf for TLS and beyond */
1481                         if (s->version > SSL3_VERSION)
1482                                 p+=2;
1483                         n=RSA_public_encrypt(sizeof tmp_buf,
1484                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1485 #ifdef PKCS1_CHECK
1486                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1487                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1488 #endif
1489                         if (n <= 0)
1490                                 {
1491                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1492                                 goto err;
1493                                 }
1494
1495                         /* Fix buf for TLS and beyond */
1496                         if (s->version > SSL3_VERSION)
1497                                 {
1498                                 s2n(n,q);
1499                                 n+=2;
1500                                 }
1501
1502                         s->session->master_key_length=
1503                                 s->method->ssl3_enc->generate_master_secret(s,
1504                                         s->session->master_key,
1505                                         tmp_buf,sizeof tmp_buf);
1506                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1507                         }
1508 #endif
1509 #ifndef OPENSSL_NO_KRB5
1510                 else if (l & SSL_kKRB5)
1511                         {
1512                         krb5_error_code krb5rc;
1513                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1514                         /*  krb5_data   krb5_ap_req;  */
1515                         krb5_data       *enc_ticket;
1516                         krb5_data       authenticator, *authp = NULL;
1517                         EVP_CIPHER_CTX  ciph_ctx;
1518                         EVP_CIPHER      *enc = NULL;
1519                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1520                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1521                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1522                                                 + EVP_MAX_IV_LENGTH];
1523                         int             padl, outl = sizeof(epms);
1524
1525                         EVP_CIPHER_CTX_init(&ciph_ctx);
1526
1527 #ifdef KSSL_DEBUG
1528                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1529                                 l, SSL_kKRB5);
1530 #endif  /* KSSL_DEBUG */
1531
1532                         authp = NULL;
1533 #ifdef KRB5SENDAUTH
1534                         if (KRB5SENDAUTH)  authp = &authenticator;
1535 #endif  /* KRB5SENDAUTH */
1536
1537                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1538                                 &kssl_err);
1539                         enc = kssl_map_enc(kssl_ctx->enctype);
1540                         if (enc == NULL)
1541                             goto err;
1542 #ifdef KSSL_DEBUG
1543                         {
1544                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1545                         if (krb5rc && kssl_err.text)
1546                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1547                         }
1548 #endif  /* KSSL_DEBUG */
1549
1550                         if (krb5rc)
1551                                 {
1552                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1553                                                 SSL_AD_HANDSHAKE_FAILURE);
1554                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1555                                                 kssl_err.reason);
1556                                 goto err;
1557                                 }
1558
1559                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1560                         **  in place of RFC 2712 KerberosWrapper, as in:
1561                         **
1562                         **  Send ticket (copy to *p, set n = length)
1563                         **  n = krb5_ap_req.length;
1564                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1565                         **  if (krb5_ap_req.data)
1566                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1567                         **
1568                         **  Now using real RFC 2712 KerberosWrapper
1569                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1570                         **  Note: 2712 "opaque" types are here replaced
1571                         **  with a 2-byte length followed by the value.
1572                         **  Example:
1573                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1574                         **  Where "xx xx" = length bytes.  Shown here with
1575                         **  optional authenticator omitted.
1576                         */
1577
1578                         /*  KerberosWrapper.Ticket              */
1579                         s2n(enc_ticket->length,p);
1580                         memcpy(p, enc_ticket->data, enc_ticket->length);
1581                         p+= enc_ticket->length;
1582                         n = enc_ticket->length + 2;
1583
1584                         /*  KerberosWrapper.Authenticator       */
1585                         if (authp  &&  authp->length)
1586                                 {
1587                                 s2n(authp->length,p);
1588                                 memcpy(p, authp->data, authp->length);
1589                                 p+= authp->length;
1590                                 n+= authp->length + 2;
1591
1592                                 free(authp->data);
1593                                 authp->data = NULL;
1594                                 authp->length = 0;
1595                                 }
1596                         else
1597                                 {
1598                                 s2n(0,p);/*  null authenticator length  */
1599                                 n+=2;
1600                                 }
1601
1602                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1603                             goto err;
1604
1605                         /*  20010420 VRS.  Tried it this way; failed.
1606                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1607                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1608                         **                              kssl_ctx->length);
1609                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1610                         */
1611
1612                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1613                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1614                                 kssl_ctx->key,iv);
1615                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1616                                 sizeof tmp_buf);
1617                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1618                         outl += padl;
1619                         if (outl > sizeof epms)
1620                                 {
1621                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1622                                 goto err;
1623                                 }
1624                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1625
1626                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1627                         s2n(outl,p);
1628                         memcpy(p, epms, outl);
1629                         p+=outl;
1630                         n+=outl + 2;
1631
1632                         s->session->master_key_length=
1633                                 s->method->ssl3_enc->generate_master_secret(s,
1634                                         s->session->master_key,
1635                                         tmp_buf, sizeof tmp_buf);
1636
1637                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1638                         OPENSSL_cleanse(epms, outl);
1639                         }
1640 #endif
1641 #ifndef OPENSSL_NO_DH
1642                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1643                         {
1644                         DH *dh_srvr,*dh_clnt;
1645
1646                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1647                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1648                         else
1649                                 {
1650                                 /* we get them from the cert */
1651                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1652                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1653                                 goto err;
1654                                 }
1655
1656                         /* generate a new random key */
1657                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1658                                 {
1659                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1660                                 goto err;
1661                                 }
1662                         if (!DH_generate_key(dh_clnt))
1663                                 {
1664                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1665                                 goto err;
1666                                 }
1667
1668                         /* use the 'p' output buffer for the DH key, but
1669                          * make sure to clear it out afterwards */
1670
1671                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1672
1673                         if (n <= 0)
1674                                 {
1675                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1676                                 goto err;
1677                                 }
1678
1679                         /* generate master key from the result */
1680                         s->session->master_key_length=
1681                                 s->method->ssl3_enc->generate_master_secret(s,
1682                                         s->session->master_key,p,n);
1683                         /* clean up */
1684                         memset(p,0,n);
1685
1686                         /* send off the data */
1687                         n=BN_num_bytes(dh_clnt->pub_key);
1688                         s2n(n,p);
1689                         BN_bn2bin(dh_clnt->pub_key,p);
1690                         n+=2;
1691
1692                         DH_free(dh_clnt);
1693
1694                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1695                         }
1696 #endif
1697                 else
1698                         {
1699                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1700                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1701                         goto err;
1702                         }
1703
1704                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1705                 l2n3(n,d);
1706
1707                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1708                 /* number of bytes to write */
1709                 s->init_num=n+4;
1710                 s->init_off=0;
1711                 }
1712
1713         /* SSL3_ST_CW_KEY_EXCH_B */
1714         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1715 err:
1716         return(-1);
1717         }
1718
1719 static int ssl3_send_client_verify(SSL *s)
1720         {
1721         unsigned char *p,*d;
1722         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1723         EVP_PKEY *pkey;
1724 #ifndef OPENSSL_NO_RSA
1725         unsigned u=0;
1726 #endif
1727         unsigned long n;
1728 #ifndef OPENSSL_NO_DSA
1729         int j;
1730 #endif
1731
1732         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1733                 {
1734                 d=(unsigned char *)s->init_buf->data;
1735                 p= &(d[4]);
1736                 pkey=s->cert->key->privatekey;
1737
1738                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1739                         &(data[MD5_DIGEST_LENGTH]));
1740
1741 #ifndef OPENSSL_NO_RSA
1742                 if (pkey->type == EVP_PKEY_RSA)
1743                         {
1744                         s->method->ssl3_enc->cert_verify_mac(s,
1745                                 &(s->s3->finish_dgst1),&(data[0]));
1746                         if (RSA_sign(NID_md5_sha1, data,
1747                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1748                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1749                                 {
1750                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1751                                 goto err;
1752                                 }
1753                         s2n(u,p);
1754                         n=u+2;
1755                         }
1756                 else
1757 #endif
1758 #ifndef OPENSSL_NO_DSA
1759                         if (pkey->type == EVP_PKEY_DSA)
1760                         {
1761                         if (!DSA_sign(pkey->save_type,
1762                                 &(data[MD5_DIGEST_LENGTH]),
1763                                 SHA_DIGEST_LENGTH,&(p[2]),
1764                                 (unsigned int *)&j,pkey->pkey.dsa))
1765                                 {
1766                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1767                                 goto err;
1768                                 }
1769                         s2n(j,p);
1770                         n=j+2;
1771                         }
1772                 else
1773 #endif
1774                         {
1775                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1776                         goto err;
1777                         }
1778                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1779                 l2n3(n,d);
1780
1781                 s->state=SSL3_ST_CW_CERT_VRFY_B;
1782                 s->init_num=(int)n+4;
1783                 s->init_off=0;
1784                 }
1785         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1786 err:
1787         return(-1);
1788         }
1789
1790 static int ssl3_send_client_certificate(SSL *s)
1791         {
1792         X509 *x509=NULL;
1793         EVP_PKEY *pkey=NULL;
1794         int i;
1795         unsigned long l;
1796
1797         if (s->state == SSL3_ST_CW_CERT_A)
1798                 {
1799                 if ((s->cert == NULL) ||
1800                         (s->cert->key->x509 == NULL) ||
1801                         (s->cert->key->privatekey == NULL))
1802                         s->state=SSL3_ST_CW_CERT_B;
1803                 else
1804                         s->state=SSL3_ST_CW_CERT_C;
1805                 }
1806
1807         /* We need to get a client cert */
1808         if (s->state == SSL3_ST_CW_CERT_B)
1809                 {
1810                 /* If we get an error, we need to
1811                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1812                  * We then get retied later */
1813                 i=0;
1814                 if (s->ctx->client_cert_cb != NULL)
1815                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1816                 if (i < 0)
1817                         {
1818                         s->rwstate=SSL_X509_LOOKUP;
1819                         return(-1);
1820                         }
1821                 s->rwstate=SSL_NOTHING;
1822                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1823                         {
1824                         s->state=SSL3_ST_CW_CERT_B;
1825                         if (    !SSL_use_certificate(s,x509) ||
1826                                 !SSL_use_PrivateKey(s,pkey))
1827                                 i=0;
1828                         }
1829                 else if (i == 1)
1830                         {
1831                         i=0;
1832                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1833                         }
1834
1835                 if (x509 != NULL) X509_free(x509);
1836                 if (pkey != NULL) EVP_PKEY_free(pkey);
1837                 if (i == 0)
1838                         {
1839                         if (s->version == SSL3_VERSION)
1840                                 {
1841                                 s->s3->tmp.cert_req=0;
1842                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1843                                 return(1);
1844                                 }
1845                         else
1846                                 {
1847                                 s->s3->tmp.cert_req=2;
1848                                 }
1849                         }
1850
1851                 /* Ok, we have a cert */
1852                 s->state=SSL3_ST_CW_CERT_C;
1853                 }
1854
1855         if (s->state == SSL3_ST_CW_CERT_C)
1856                 {
1857                 s->state=SSL3_ST_CW_CERT_D;
1858                 l=ssl3_output_cert_chain(s,
1859                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1860                 s->init_num=(int)l;
1861                 s->init_off=0;
1862                 }
1863         /* SSL3_ST_CW_CERT_D */
1864         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1865         }
1866
1867 #define has_bits(i,m)   (((i)&(m)) == (m))
1868
1869 static int ssl3_check_cert_and_algorithm(SSL *s)
1870         {
1871         int i,idx;
1872         long algs;
1873         EVP_PKEY *pkey=NULL;
1874         SESS_CERT *sc;
1875 #ifndef OPENSSL_NO_RSA
1876         RSA *rsa;
1877 #endif
1878 #ifndef OPENSSL_NO_DH
1879         DH *dh;
1880 #endif
1881
1882         sc=s->session->sess_cert;
1883
1884         if (sc == NULL)
1885                 {
1886                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
1887                 goto err;
1888                 }
1889
1890         algs=s->s3->tmp.new_cipher->algorithms;
1891
1892         /* we don't have a certificate */
1893         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
1894                 return(1);
1895
1896 #ifndef OPENSSL_NO_RSA
1897         rsa=s->session->sess_cert->peer_rsa_tmp;
1898 #endif
1899 #ifndef OPENSSL_NO_DH
1900         dh=s->session->sess_cert->peer_dh_tmp;
1901 #endif
1902
1903         /* This is the passed certificate */
1904
1905         idx=sc->peer_cert_type;
1906         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1907         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1908         EVP_PKEY_free(pkey);
1909
1910
1911         /* Check that we have a certificate if we require one */
1912         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1913                 {
1914                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1915                 goto f_err;
1916                 }
1917 #ifndef OPENSSL_NO_DSA
1918         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1919                 {
1920                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1921                 goto f_err;
1922                 }
1923 #endif
1924 #ifndef OPENSSL_NO_RSA
1925         if ((algs & SSL_kRSA) &&
1926                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1927                 {
1928                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1929                 goto f_err;
1930                 }
1931 #endif
1932 #ifndef OPENSSL_NO_DH
1933         if ((algs & SSL_kEDH) &&
1934                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1935                 {
1936                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1937                 goto f_err;
1938                 }
1939         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1940                 {
1941                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1942                 goto f_err;
1943                 }
1944 #ifndef OPENSSL_NO_DSA
1945         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1946                 {
1947                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1948                 goto f_err;
1949                 }
1950 #endif
1951 #endif
1952
1953         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
1954                 {
1955 #ifndef OPENSSL_NO_RSA
1956                 if (algs & SSL_kRSA)
1957                         {
1958                         if (rsa == NULL
1959                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1960                                 {
1961                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1962                                 goto f_err;
1963                                 }
1964                         }
1965                 else
1966 #endif
1967 #ifndef OPENSSL_NO_DH
1968                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1969                             {
1970                             if (dh == NULL
1971                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1972                                 {
1973                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1974                                 goto f_err;
1975                                 }
1976                         }
1977                 else
1978 #endif
1979                         {
1980                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1981                         goto f_err;
1982                         }
1983                 }
1984         return(1);
1985 f_err:
1986         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1987 err:
1988         return(0);
1989         }
1990