crypto/openssl-0.9.7e/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                 if(RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time)) <= 0)
 539                     goto err;
 540
 541                 /* Do the message type and length last */
 542                 d=p= &(buf[4]);
 543
 544                 *(p++)=s->version>>8;
 545                 *(p++)=s->version&0xff;
 546                 s->client_version=s->version;
 547
 548                 /* Random stuff */
 549                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 550                 p+=SSL3_RANDOM_SIZE;
 551
 552                 /* Session ID */
 553                 if (s->new_session)
 554                         i=0;
 555                 else
 556                         i=s->session->session_id_length;
 557                 *(p++)=i;
 558                 if (i != 0)
 559                         {
 560                         if (i > sizeof s->session->session_id)
 561                                 {
 562                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 563                                 goto err;
 564                                 }
 565                         memcpy(p,s->session->session_id,i);
 566                         p+=i;
 567                         }
 568
 569                 /* Ciphers supported */
 570                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 571                 if (i == 0)
 572                         {
 573                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 574                         goto err;
 575                         }
 576                 s2n(i,p);
 577                 p+=i;
 578
 579                 /* COMPRESSION */
 580                 if (s->ctx->comp_methods == NULL)
 581                         j=0;
 582                 else
 583                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 584                 *(p++)=1+j;
 585                 for (i=0; i<j; i++)
 586                         {
 587                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 588                         *(p++)=comp->id;
 589                         }
 590                 *(p++)=0; /* Add the NULL method */
 591
 592                 l=(p-d);
 593                 d=buf;
 594                 *(d++)=SSL3_MT_CLIENT_HELLO;
 595                 l2n3(l,d);
 596
 597                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 598                 /* number of bytes to write */
 599                 s->init_num=p-buf;
 600                 s->init_off=0;
 601                 }
 602
 603         /* SSL3_ST_CW_CLNT_HELLO_B */
 604         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 605 err:
 606         return(-1);
 607         }
 608
 609 static int ssl3_get_server_hello(SSL *s)
 610         {
 611         STACK_OF(SSL_CIPHER) *sk;
 612         SSL_CIPHER *c;
 613         unsigned char *p,*d;
 614         int i,al,ok;
 615         unsigned int j;
 616         long n;
 617         SSL_COMP *comp;
 618
 619         n=ssl3_get_message(s,
 620                 SSL3_ST_CR_SRVR_HELLO_A,
 621                 SSL3_ST_CR_SRVR_HELLO_B,
 622                 SSL3_MT_SERVER_HELLO,
 623                 300, /* ?? */
 624                 &ok);
 625
 626         if (!ok) return((int)n);
 627         d=p=(unsigned char *)s->init_msg;
 628
 629         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 630                 {
 631                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 632                 s->version=(s->version&0xff00)|p[1];
 633                 al=SSL_AD_PROTOCOL_VERSION;
 634                 goto f_err;
 635                 }
 636         p+=2;
 637
 638         /* load the server hello data */
 639         /* load the server random */
 640         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 641         p+=SSL3_RANDOM_SIZE;
 642
 643         /* get the session-id */
 644         j= *(p++);
 645
 646         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 647                 {
 648                 al=SSL_AD_ILLEGAL_PARAMETER;
 649                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 650                 goto f_err;
 651                 }
 652
 653         if (j != 0 && j == s->session->session_id_length
 654             && memcmp(p,s->session->session_id,j) == 0)
 655             {
 656             if(s->sid_ctx_length != s->session->sid_ctx_length
 657                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 658                 {
 659                 /* actually a client application bug */
 660                 al=SSL_AD_ILLEGAL_PARAMETER;
 661                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 662                 goto f_err;
 663                 }
 664             s->hit=1;
 665             }
 666         else    /* a miss or crap from the other end */
 667                 {
 668                 /* If we were trying for session-id reuse, make a new
 669                  * SSL_SESSION so we don't stuff up other people */
 670                 s->hit=0;
 671                 if (s->session->session_id_length > 0)
 672                         {
 673                         if (!ssl_get_new_session(s,0))
 674                                 {
 675                                 al=SSL_AD_INTERNAL_ERROR;
 676                                 goto f_err;
 677                                 }
 678                         }
 679                 s->session->session_id_length=j;
 680                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 681                 }
 682         p+=j;
 683         c=ssl_get_cipher_by_char(s,p);
 684         if (c == NULL)
 685                 {
 686                 /* unknown cipher */
 687                 al=SSL_AD_ILLEGAL_PARAMETER;
 688                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 689                 goto f_err;
 690                 }
 691         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 692
 693         sk=ssl_get_ciphers_by_id(s);
 694         i=sk_SSL_CIPHER_find(sk,c);
 695         if (i < 0)
 696                 {
 697                 /* we did not say we would use this cipher */
 698                 al=SSL_AD_ILLEGAL_PARAMETER;
 699                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 700                 goto f_err;
 701                 }
 702
 703         /* Depending on the session caching (internal/external), the cipher
 704            and/or cipher_id values may not be set. Make sure that
 705            cipher_id is set and use it for comparison. */
 706         if (s->session->cipher)
 707                 s->session->cipher_id = s->session->cipher->id;
 708         if (s->hit && (s->session->cipher_id != c->id))
 709                 {
 710                 if (!(s->options &
 711                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 712                         {
 713                         al=SSL_AD_ILLEGAL_PARAMETER;
 714                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 715                         goto f_err;
 716                         }
 717                 }
 718         s->s3->tmp.new_cipher=c;
 719
 720         /* lets get the compression algorithm */
 721         /* COMPRESSION */
 722         j= *(p++);
 723         if (j == 0)
 724                 comp=NULL;
 725         else
 726                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 727
 728         if ((j != 0) && (comp == NULL))
 729                 {
 730                 al=SSL_AD_ILLEGAL_PARAMETER;
 731                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 732                 goto f_err;
 733                 }
 734         else
 735                 {
 736                 s->s3->tmp.new_compression=comp;
 737                 }
 738
 739         if (p != (d+n))
 740                 {
 741                 /* wrong packet length */
 742                 al=SSL_AD_DECODE_ERROR;
 743                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 744                 goto err;
 745                 }
 746
 747         return(1);
 748 f_err:
 749         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 750 err:
 751         return(-1);
 752         }
 753
 754 static int ssl3_get_server_certificate(SSL *s)
 755         {
 756         int al,i,ok,ret= -1;
 757         unsigned long n,nc,llen,l;
 758         X509 *x=NULL;
 759         unsigned char *p,*d,*q;
 760         STACK_OF(X509) *sk=NULL;
 761         SESS_CERT *sc;
 762         EVP_PKEY *pkey=NULL;
 763         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 764
 765         n=ssl3_get_message(s,
 766                 SSL3_ST_CR_CERT_A,
 767                 SSL3_ST_CR_CERT_B,
 768                 -1,
 769                 s->max_cert_list,
 770                 &ok);
 771
 772         if (!ok) return((int)n);
 773
 774         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 775                 {
 776                 s->s3->tmp.reuse_message=1;
 777                 return(1);
 778                 }
 779
 780         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 781                 {
 782                 al=SSL_AD_UNEXPECTED_MESSAGE;
 783                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 784                 goto f_err;
 785                 }
 786         d=p=(unsigned char *)s->init_msg;
 787
 788         if ((sk=sk_X509_new_null()) == NULL)
 789                 {
 790                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 791                 goto err;
 792                 }
 793
 794         n2l3(p,llen);
 795         if (llen+3 != n)
 796                 {
 797                 al=SSL_AD_DECODE_ERROR;
 798                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 799                 goto f_err;
 800                 }
 801         for (nc=0; nc<llen; )
 802                 {
 803                 n2l3(p,l);
 804                 if ((l+nc+3) > llen)
 805                         {
 806                         al=SSL_AD_DECODE_ERROR;
 807                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 808                         goto f_err;
 809                         }
 810
 811                 q=p;
 812                 x=d2i_X509(NULL,&q,l);
 813                 if (x == NULL)
 814                         {
 815                         al=SSL_AD_BAD_CERTIFICATE;
 816                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 817                         goto f_err;
 818                         }
 819                 if (q != (p+l))
 820                         {
 821                         al=SSL_AD_DECODE_ERROR;
 822                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 823                         goto f_err;
 824                         }
 825                 if (!sk_X509_push(sk,x))
 826                         {
 827                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 828                         goto err;
 829                         }
 830                 x=NULL;
 831                 nc+=l+3;
 832                 p=q;
 833                 }
 834
 835         i=ssl_verify_cert_chain(s,sk);
 836         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 837 #ifndef OPENSSL_NO_KRB5
 838                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 839                 != (SSL_aKRB5|SSL_kKRB5)
 840 #endif /* OPENSSL_NO_KRB5 */
 841                 )
 842                 {
 843                 al=ssl_verify_alarm_type(s->verify_result);
 844                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 845                 goto f_err;
 846                 }
 847         ERR_clear_error(); /* but we keep s->verify_result */
 848
 849         sc=ssl_sess_cert_new();
 850         if (sc == NULL) goto err;
 851
 852         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 853         s->session->sess_cert=sc;
 854
 855         sc->cert_chain=sk;
 856         /* Inconsistency alert: cert_chain does include the peer's
 857          * certificate, which we don't include in s3_srvr.c */
 858         x=sk_X509_value(sk,0);
 859         sk=NULL;
 860         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 861
 862         pkey=X509_get_pubkey(x);
 863
 864         /* VRS: allow null cert if auth == KRB5 */
 865         need_cert =     ((s->s3->tmp.new_cipher->algorithms
 866                         & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 867                         == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 868
 869 #ifdef KSSL_DEBUG
 870         printf("pkey,x = %p, %p\n", pkey,x);
 871         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 872         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 873                 s->s3->tmp.new_cipher->algorithms, need_cert);
 874 #endif    /* KSSL_DEBUG */
 875
 876         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 877                 {
 878                 x=NULL;
 879                 al=SSL3_AL_FATAL;
 880                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 881                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 882                 goto f_err;
 883                 }
 884
 885         i=ssl_cert_type(x,pkey);
 886         if (need_cert && i < 0)
 887                 {
 888                 x=NULL;
 889                 al=SSL3_AL_FATAL;
 890                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 891                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 892                 goto f_err;
 893                 }
 894
 895         if (need_cert)
 896                 {
 897                 sc->peer_cert_type=i;
 898                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 899                 /* Why would the following ever happen?
 900                  * We just created sc a couple of lines ago. */
 901                 if (sc->peer_pkeys[i].x509 != NULL)
 902                         X509_free(sc->peer_pkeys[i].x509);
 903                 sc->peer_pkeys[i].x509=x;
 904                 sc->peer_key= &(sc->peer_pkeys[i]);
 905
 906                 if (s->session->peer != NULL)
 907                         X509_free(s->session->peer);
 908                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 909                 s->session->peer=x;
 910                 }
 911         else
 912                 {
 913                 sc->peer_cert_type=i;
 914                 sc->peer_key= NULL;
 915
 916                 if (s->session->peer != NULL)
 917                         X509_free(s->session->peer);
 918                 s->session->peer=NULL;
 919                 }
 920         s->session->verify_result = s->verify_result;
 921
 922         x=NULL;
 923         ret=1;
 924
 925         if (0)
 926                 {
 927 f_err:
 928                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 929                 }
 930 err:
 931         EVP_PKEY_free(pkey);
 932         X509_free(x);
 933         sk_X509_pop_free(sk,X509_free);
 934         return(ret);
 935         }
 936
 937 static int ssl3_get_key_exchange(SSL *s)
 938         {
 939 #ifndef OPENSSL_NO_RSA
 940         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 941 #endif
 942         EVP_MD_CTX md_ctx;
 943         unsigned char *param,*p;
 944         int al,i,j,param_len,ok;
 945         long n,alg;
 946         EVP_PKEY *pkey=NULL;
 947 #ifndef OPENSSL_NO_RSA
 948         RSA *rsa=NULL;
 949 #endif
 950 #ifndef OPENSSL_NO_DH
 951         DH *dh=NULL;
 952 #endif
 953
 954         /* use same message size as in ssl3_get_certificate_request()
 955          * as ServerKeyExchange message may be skipped */
 956         n=ssl3_get_message(s,
 957                 SSL3_ST_CR_KEY_EXCH_A,
 958                 SSL3_ST_CR_KEY_EXCH_B,
 959                 -1,
 960                 s->max_cert_list,
 961                 &ok);
 962
 963         if (!ok) return((int)n);
 964
 965         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 966                 {
 967                 s->s3->tmp.reuse_message=1;
 968                 return(1);
 969                 }
 970
 971         param=p=(unsigned char *)s->init_msg;
 972
 973         if (s->session->sess_cert != NULL)
 974                 {
 975 #ifndef OPENSSL_NO_RSA
 976                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
 977                         {
 978                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
 979                         s->session->sess_cert->peer_rsa_tmp=NULL;
 980                         }
 981 #endif
 982 #ifndef OPENSSL_NO_DH
 983                 if (s->session->sess_cert->peer_dh_tmp)
 984                         {
 985                         DH_free(s->session->sess_cert->peer_dh_tmp);
 986                         s->session->sess_cert->peer_dh_tmp=NULL;
 987                         }
 988 #endif
 989                 }
 990         else
 991                 {
 992                 s->session->sess_cert=ssl_sess_cert_new();
 993                 }
 994
 995         param_len=0;
 996         alg=s->s3->tmp.new_cipher->algorithms;
 997         EVP_MD_CTX_init(&md_ctx);
 998
 999 #ifndef OPENSSL_NO_RSA
1000         if (alg & SSL_kRSA)
1001                 {
1002                 if ((rsa=RSA_new()) == NULL)
1003                         {
1004                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1005                         goto err;
1006                         }
1007                 n2s(p,i);
1008                 param_len=i+2;
1009                 if (param_len > n)
1010                         {
1011                         al=SSL_AD_DECODE_ERROR;
1012                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1013                         goto f_err;
1014                         }
1015                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1016                         {
1017                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1018                         goto err;
1019                         }
1020                 p+=i;
1021
1022                 n2s(p,i);
1023                 param_len+=i+2;
1024                 if (param_len > n)
1025                         {
1026                         al=SSL_AD_DECODE_ERROR;
1027                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1028                         goto f_err;
1029                         }
1030                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1031                         {
1032                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1033                         goto err;
1034                         }
1035                 p+=i;
1036                 n-=param_len;
1037
1038                 /* this should be because we are using an export cipher */
1039                 if (alg & SSL_aRSA)
1040                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1041                 else
1042                         {
1043                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1044                         goto err;
1045                         }
1046                 s->session->sess_cert->peer_rsa_tmp=rsa;
1047                 rsa=NULL;
1048                 }
1049 #else /* OPENSSL_NO_RSA */
1050         if (0)
1051                 ;
1052 #endif
1053 #ifndef OPENSSL_NO_DH
1054         else if (alg & SSL_kEDH)
1055                 {
1056                 if ((dh=DH_new()) == NULL)
1057                         {
1058                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1059                         goto err;
1060                         }
1061                 n2s(p,i);
1062                 param_len=i+2;
1063                 if (param_len > n)
1064                         {
1065                         al=SSL_AD_DECODE_ERROR;
1066                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1067                         goto f_err;
1068                         }
1069                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1070                         {
1071                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1072                         goto err;
1073                         }
1074                 p+=i;
1075
1076                 n2s(p,i);
1077                 param_len+=i+2;
1078                 if (param_len > n)
1079                         {
1080                         al=SSL_AD_DECODE_ERROR;
1081                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1082                         goto f_err;
1083                         }
1084                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1085                         {
1086                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1087                         goto err;
1088                         }
1089                 p+=i;
1090
1091                 n2s(p,i);
1092                 param_len+=i+2;
1093                 if (param_len > n)
1094                         {
1095                         al=SSL_AD_DECODE_ERROR;
1096                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1097                         goto f_err;
1098                         }
1099                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1100                         {
1101                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1102                         goto err;
1103                         }
1104                 p+=i;
1105                 n-=param_len;
1106
1107 #ifndef OPENSSL_NO_RSA
1108                 if (alg & SSL_aRSA)
1109                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1110 #else
1111                 if (0)
1112                         ;
1113 #endif
1114 #ifndef OPENSSL_NO_DSA
1115                 else if (alg & SSL_aDSS)
1116                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1117 #endif
1118                 /* else anonymous DH, so no certificate or pkey. */
1119
1120                 s->session->sess_cert->peer_dh_tmp=dh;
1121                 dh=NULL;
1122                 }
1123         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1124                 {
1125                 al=SSL_AD_ILLEGAL_PARAMETER;
1126                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1127                 goto f_err;
1128                 }
1129 #endif /* !OPENSSL_NO_DH */
1130         if (alg & SSL_aFZA)
1131                 {
1132                 al=SSL_AD_HANDSHAKE_FAILURE;
1133                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1134                 goto f_err;
1135                 }
1136
1137
1138         /* p points to the next byte, there are 'n' bytes left */
1139
1140
1141         /* if it was signed, check the signature */
1142         if (pkey != NULL)
1143                 {
1144                 n2s(p,i);
1145                 n-=2;
1146                 j=EVP_PKEY_size(pkey);
1147
1148                 if ((i != n) || (n > j) || (n <= 0))
1149                         {
1150                         /* wrong packet length */
1151                         al=SSL_AD_DECODE_ERROR;
1152                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1153                         goto f_err;
1154                         }
1155
1156 #ifndef OPENSSL_NO_RSA
1157                 if (pkey->type == EVP_PKEY_RSA)
1158                         {
1159                         int num;
1160
1161                         j=0;
1162                         q=md_buf;
1163                         for (num=2; num > 0; num--)
1164                                 {
1165                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1166                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1167                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1168                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1169                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1170 #ifdef OPENSSL_FIPS
1171                                 if(s->version == TLS1_VERSION && num == 2)
1172                                         FIPS_allow_md5(1);
1173 #endif
1174
1175                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1176 #ifdef OPENSSL_FIPS
1177                                 if(s->version == TLS1_VERSION && num == 2)
1178                                         FIPS_allow_md5(1);
1179 #endif
1180                                 q+=i;
1181                                 j+=i;
1182                                 }
1183                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1184                                                                 pkey->pkey.rsa);
1185                         if (i < 0)
1186                                 {
1187                                 al=SSL_AD_DECRYPT_ERROR;
1188                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1189                                 goto f_err;
1190                                 }
1191                         if (i == 0)
1192                                 {
1193                                 /* bad signature */
1194                                 al=SSL_AD_DECRYPT_ERROR;
1195                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1196                                 goto f_err;
1197                                 }
1198                         }
1199                 else
1200 #endif
1201 #ifndef OPENSSL_NO_DSA
1202                         if (pkey->type == EVP_PKEY_DSA)
1203                         {
1204                         /* lets do DSS */
1205                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1206                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1207                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1208                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1209                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1210                                 {
1211                                 /* bad signature */
1212                                 al=SSL_AD_DECRYPT_ERROR;
1213                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1214                                 goto f_err;
1215                                 }
1216                         }
1217                 else
1218 #endif
1219                         {
1220                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1221                         goto err;
1222                         }
1223                 }
1224         else
1225                 {
1226                 /* still data left over */
1227                 if (!(alg & SSL_aNULL))
1228                         {
1229                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1230                         goto err;
1231                         }
1232                 if (n != 0)
1233                         {
1234                         al=SSL_AD_DECODE_ERROR;
1235                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1236                         goto f_err;
1237                         }
1238                 }
1239         EVP_PKEY_free(pkey);
1240         EVP_MD_CTX_cleanup(&md_ctx);
1241         return(1);
1242 f_err:
1243         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1244 err:
1245         EVP_PKEY_free(pkey);
1246 #ifndef OPENSSL_NO_RSA
1247         if (rsa != NULL)
1248                 RSA_free(rsa);
1249 #endif
1250 #ifndef OPENSSL_NO_DH
1251         if (dh != NULL)
1252                 DH_free(dh);
1253 #endif
1254         EVP_MD_CTX_cleanup(&md_ctx);
1255         return(-1);
1256         }
1257
1258 static int ssl3_get_certificate_request(SSL *s)
1259         {
1260         int ok,ret=0;
1261         unsigned long n,nc,l;
1262         unsigned int llen,ctype_num,i;
1263         X509_NAME *xn=NULL;
1264         unsigned char *p,*d,*q;
1265         STACK_OF(X509_NAME) *ca_sk=NULL;
1266
1267         n=ssl3_get_message(s,
1268                 SSL3_ST_CR_CERT_REQ_A,
1269                 SSL3_ST_CR_CERT_REQ_B,
1270                 -1,
1271                 s->max_cert_list,
1272                 &ok);
1273
1274         if (!ok) return((int)n);
1275
1276         s->s3->tmp.cert_req=0;
1277
1278         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1279                 {
1280                 s->s3->tmp.reuse_message=1;
1281                 return(1);
1282                 }
1283
1284         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1285                 {
1286                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1287                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1288                 goto err;
1289                 }
1290
1291         /* TLS does not like anon-DH with client cert */
1292         if (s->version > SSL3_VERSION)
1293                 {
1294                 l=s->s3->tmp.new_cipher->algorithms;
1295                 if (l & SSL_aNULL)
1296                         {
1297                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1298                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1299                         goto err;
1300                         }
1301                 }
1302
1303         d=p=(unsigned char *)s->init_msg;
1304
1305         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1306                 {
1307                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1308                 goto err;
1309                 }
1310
1311         /* get the certificate types */
1312         ctype_num= *(p++);
1313         if (ctype_num > SSL3_CT_NUMBER)
1314                 ctype_num=SSL3_CT_NUMBER;
1315         for (i=0; i<ctype_num; i++)
1316                 s->s3->tmp.ctype[i]= p[i];
1317         p+=ctype_num;
1318
1319         /* get the CA RDNs */
1320         n2s(p,llen);
1321 #if 0
1322 {
1323 FILE *out;
1324 out=fopen("/tmp/vsign.der","w");
1325 fwrite(p,1,llen,out);
1326 fclose(out);
1327 }
1328 #endif
1329
1330         if ((llen+ctype_num+2+1) != n)
1331                 {
1332                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1333                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1334                 goto err;
1335                 }
1336
1337         for (nc=0; nc<llen; )
1338                 {
1339                 n2s(p,l);
1340                 if ((l+nc+2) > llen)
1341                         {
1342                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1343                                 goto cont; /* netscape bugs */
1344                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1345                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1346                         goto err;
1347                         }
1348
1349                 q=p;
1350
1351                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1352                         {
1353                         /* If netscape tolerance is on, ignore errors */
1354                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1355                                 goto cont;
1356                         else
1357                                 {
1358                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1359                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1360                                 goto err;
1361                                 }
1362                         }
1363
1364                 if (q != (p+l))
1365                         {
1366                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1367                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1368                         goto err;
1369                         }
1370                 if (!sk_X509_NAME_push(ca_sk,xn))
1371                         {
1372                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1373                         goto err;
1374                         }
1375
1376                 p+=l;
1377                 nc+=l+2;
1378                 }
1379
1380         if (0)
1381                 {
1382 cont:
1383                 ERR_clear_error();
1384                 }
1385
1386         /* we should setup a certificate to return.... */
1387         s->s3->tmp.cert_req=1;
1388         s->s3->tmp.ctype_num=ctype_num;
1389         if (s->s3->tmp.ca_names != NULL)
1390                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1391         s->s3->tmp.ca_names=ca_sk;
1392         ca_sk=NULL;
1393
1394         ret=1;
1395 err:
1396         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1397         return(ret);
1398         }
1399
1400 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1401         {
1402         return(X509_NAME_cmp(*a,*b));
1403         }
1404
1405 static int ssl3_get_server_done(SSL *s)
1406         {
1407         int ok,ret=0;
1408         long n;
1409
1410         n=ssl3_get_message(s,
1411                 SSL3_ST_CR_SRVR_DONE_A,
1412                 SSL3_ST_CR_SRVR_DONE_B,
1413                 SSL3_MT_SERVER_DONE,
1414                 30, /* should be very small, like 0 :-) */
1415                 &ok);
1416
1417         if (!ok) return((int)n);
1418         if (n > 0)
1419                 {
1420                 /* should contain no data */
1421                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1422                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1423                 return -1;
1424                 }
1425         ret=1;
1426         return(ret);
1427         }
1428
1429 static int ssl3_send_client_key_exchange(SSL *s)
1430         {
1431         unsigned char *p,*d;
1432         int n;
1433         unsigned long l;
1434 #ifndef OPENSSL_NO_RSA
1435         unsigned char *q;
1436         EVP_PKEY *pkey=NULL;
1437 #endif
1438 #ifndef OPENSSL_NO_KRB5
1439         KSSL_ERR kssl_err;
1440 #endif /* OPENSSL_NO_KRB5 */
1441
1442         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1443                 {
1444                 d=(unsigned char *)s->init_buf->data;
1445                 p= &(d[4]);
1446
1447                 l=s->s3->tmp.new_cipher->algorithms;
1448
1449                 /* Fool emacs indentation */
1450                 if (0) {}
1451 #ifndef OPENSSL_NO_RSA
1452                 else if (l & SSL_kRSA)
1453                         {
1454                         RSA *rsa;
1455                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1456
1457                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1458                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1459                         else
1460                                 {
1461                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1462                                 if ((pkey == NULL) ||
1463                                         (pkey->type != EVP_PKEY_RSA) ||
1464                                         (pkey->pkey.rsa == NULL))
1465                                         {
1466                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1467                                         goto err;
1468                                         }
1469                                 rsa=pkey->pkey.rsa;
1470                                 EVP_PKEY_free(pkey);
1471                                 }
1472
1473                         tmp_buf[0]=s->client_version>>8;
1474                         tmp_buf[1]=s->client_version&0xff;
1475                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1476                                         goto err;
1477
1478                         s->session->master_key_length=sizeof tmp_buf;
1479
1480                         q=p;
1481                         /* Fix buf for TLS and beyond */
1482                         if (s->version > SSL3_VERSION)
1483                                 p+=2;
1484                         n=RSA_public_encrypt(sizeof tmp_buf,
1485                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1486 #ifdef PKCS1_CHECK
1487                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1488                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1489 #endif
1490                         if (n <= 0)
1491                                 {
1492                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1493                                 goto err;
1494                                 }
1495
1496                         /* Fix buf for TLS and beyond */
1497                         if (s->version > SSL3_VERSION)
1498                                 {
1499                                 s2n(n,q);
1500                                 n+=2;
1501                                 }
1502
1503                         s->session->master_key_length=
1504                                 s->method->ssl3_enc->generate_master_secret(s,
1505                                         s->session->master_key,
1506                                         tmp_buf,sizeof tmp_buf);
1507                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1508                         }
1509 #endif
1510 #ifndef OPENSSL_NO_KRB5
1511                 else if (l & SSL_kKRB5)
1512                         {
1513                         krb5_error_code krb5rc;
1514                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1515                         /*  krb5_data   krb5_ap_req;  */
1516                         krb5_data       *enc_ticket;
1517                         krb5_data       authenticator, *authp = NULL;
1518                         EVP_CIPHER_CTX  ciph_ctx;
1519                         EVP_CIPHER      *enc = NULL;
1520                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1521                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1522                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1523                                                 + EVP_MAX_IV_LENGTH];
1524                         int             padl, outl = sizeof(epms);
1525
1526                         EVP_CIPHER_CTX_init(&ciph_ctx);
1527
1528 #ifdef KSSL_DEBUG
1529                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1530                                 l, SSL_kKRB5);
1531 #endif  /* KSSL_DEBUG */
1532
1533                         authp = NULL;
1534 #ifdef KRB5SENDAUTH
1535                         if (KRB5SENDAUTH)  authp = &authenticator;
1536 #endif  /* KRB5SENDAUTH */
1537
1538                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1539                                 &kssl_err);
1540                         enc = kssl_map_enc(kssl_ctx->enctype);
1541                         if (enc == NULL)
1542                             goto err;
1543 #ifdef KSSL_DEBUG
1544                         {
1545                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1546                         if (krb5rc && kssl_err.text)
1547                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1548                         }
1549 #endif  /* KSSL_DEBUG */
1550
1551                         if (krb5rc)
1552                                 {
1553                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1554                                                 SSL_AD_HANDSHAKE_FAILURE);
1555                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1556                                                 kssl_err.reason);
1557                                 goto err;
1558                                 }
1559
1560                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1561                         **  in place of RFC 2712 KerberosWrapper, as in:
1562                         **
1563                         **  Send ticket (copy to *p, set n = length)
1564                         **  n = krb5_ap_req.length;
1565                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1566                         **  if (krb5_ap_req.data)
1567                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1568                         **
1569                         **  Now using real RFC 2712 KerberosWrapper
1570                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1571                         **  Note: 2712 "opaque" types are here replaced
1572                         **  with a 2-byte length followed by the value.
1573                         **  Example:
1574                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1575                         **  Where "xx xx" = length bytes.  Shown here with
1576                         **  optional authenticator omitted.
1577                         */
1578
1579                         /*  KerberosWrapper.Ticket              */
1580                         s2n(enc_ticket->length,p);
1581                         memcpy(p, enc_ticket->data, enc_ticket->length);
1582                         p+= enc_ticket->length;
1583                         n = enc_ticket->length + 2;
1584
1585                         /*  KerberosWrapper.Authenticator       */
1586                         if (authp  &&  authp->length)
1587                                 {
1588                                 s2n(authp->length,p);
1589                                 memcpy(p, authp->data, authp->length);
1590                                 p+= authp->length;
1591                                 n+= authp->length + 2;
1592
1593                                 free(authp->data);
1594                                 authp->data = NULL;
1595                                 authp->length = 0;
1596                                 }
1597                         else
1598                                 {
1599                                 s2n(0,p);/*  null authenticator length  */
1600                                 n+=2;
1601                                 }
1602
1603                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1604                             goto err;
1605
1606                         /*  20010420 VRS.  Tried it this way; failed.
1607                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1608                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1609                         **                              kssl_ctx->length);
1610                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1611                         */
1612
1613                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1614                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1615                                 kssl_ctx->key,iv);
1616                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1617                                 sizeof tmp_buf);
1618                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1619                         outl += padl;
1620                         if (outl > sizeof epms)
1621                                 {
1622                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1623                                 goto err;
1624                                 }
1625                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1626
1627                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1628                         s2n(outl,p);
1629                         memcpy(p, epms, outl);
1630                         p+=outl;
1631                         n+=outl + 2;
1632
1633                         s->session->master_key_length=
1634                                 s->method->ssl3_enc->generate_master_secret(s,
1635                                         s->session->master_key,
1636                                         tmp_buf, sizeof tmp_buf);
1637
1638                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1639                         OPENSSL_cleanse(epms, outl);
1640                         }
1641 #endif
1642 #ifndef OPENSSL_NO_DH
1643                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1644                         {
1645                         DH *dh_srvr,*dh_clnt;
1646
1647                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1648                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1649                         else
1650                                 {
1651                                 /* we get them from the cert */
1652                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1653                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1654                                 goto err;
1655                                 }
1656
1657                         /* generate a new random key */
1658                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1659                                 {
1660                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1661                                 goto err;
1662                                 }
1663                         if (!DH_generate_key(dh_clnt))
1664                                 {
1665                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1666                                 goto err;
1667                                 }
1668
1669                         /* use the 'p' output buffer for the DH key, but
1670                          * make sure to clear it out afterwards */
1671
1672                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1673
1674                         if (n <= 0)
1675                                 {
1676                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1677                                 goto err;
1678                                 }
1679
1680                         /* generate master key from the result */
1681                         s->session->master_key_length=
1682                                 s->method->ssl3_enc->generate_master_secret(s,
1683                                         s->session->master_key,p,n);
1684                         /* clean up */
1685                         memset(p,0,n);
1686
1687                         /* send off the data */
1688                         n=BN_num_bytes(dh_clnt->pub_key);
1689                         s2n(n,p);
1690                         BN_bn2bin(dh_clnt->pub_key,p);
1691                         n+=2;
1692
1693                         DH_free(dh_clnt);
1694
1695                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1696                         }
1697 #endif
1698                 else
1699                         {
1700                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1701                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1702                         goto err;
1703                         }
1704
1705                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1706                 l2n3(n,d);
1707
1708                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1709                 /* number of bytes to write */
1710                 s->init_num=n+4;
1711                 s->init_off=0;
1712                 }
1713
1714         /* SSL3_ST_CW_KEY_EXCH_B */
1715         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1716 err:
1717         return(-1);
1718         }
1719
1720 static int ssl3_send_client_verify(SSL *s)
1721         {
1722         unsigned char *p,*d;
1723         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1724         EVP_PKEY *pkey;
1725 #ifndef OPENSSL_NO_RSA
1726         unsigned u=0;
1727 #endif
1728         unsigned long n;
1729 #ifndef OPENSSL_NO_DSA
1730         int j;
1731 #endif
1732
1733         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1734                 {
1735                 d=(unsigned char *)s->init_buf->data;
1736                 p= &(d[4]);
1737                 pkey=s->cert->key->privatekey;
1738
1739                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1740                         &(data[MD5_DIGEST_LENGTH]));
1741
1742 #ifndef OPENSSL_NO_RSA
1743                 if (pkey->type == EVP_PKEY_RSA)
1744                         {
1745                         s->method->ssl3_enc->cert_verify_mac(s,
1746                                 &(s->s3->finish_dgst1),&(data[0]));
1747                         if (RSA_sign(NID_md5_sha1, data,
1748                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1749                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1750                                 {
1751                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1752                                 goto err;
1753                                 }
1754                         s2n(u,p);
1755                         n=u+2;
1756                         }
1757                 else
1758 #endif
1759 #ifndef OPENSSL_NO_DSA
1760                         if (pkey->type == EVP_PKEY_DSA)
1761                         {
1762                         if (!DSA_sign(pkey->save_type,
1763                                 &(data[MD5_DIGEST_LENGTH]),
1764                                 SHA_DIGEST_LENGTH,&(p[2]),
1765                                 (unsigned int *)&j,pkey->pkey.dsa))
1766                                 {
1767                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1768                                 goto err;
1769                                 }
1770                         s2n(j,p);
1771                         n=j+2;
1772                         }
1773                 else
1774 #endif
1775                         {
1776                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1777                         goto err;
1778                         }
1779                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1780                 l2n3(n,d);
1781
1782                 s->state=SSL3_ST_CW_CERT_VRFY_B;
1783                 s->init_num=(int)n+4;
1784                 s->init_off=0;
1785                 }
1786         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1787 err:
1788         return(-1);
1789         }
1790
1791 static int ssl3_send_client_certificate(SSL *s)
1792         {
1793         X509 *x509=NULL;
1794         EVP_PKEY *pkey=NULL;
1795         int i;
1796         unsigned long l;
1797
1798         if (s->state == SSL3_ST_CW_CERT_A)
1799                 {
1800                 if ((s->cert == NULL) ||
1801                         (s->cert->key->x509 == NULL) ||
1802                         (s->cert->key->privatekey == NULL))
1803                         s->state=SSL3_ST_CW_CERT_B;
1804                 else
1805                         s->state=SSL3_ST_CW_CERT_C;
1806                 }
1807
1808         /* We need to get a client cert */
1809         if (s->state == SSL3_ST_CW_CERT_B)
1810                 {
1811                 /* If we get an error, we need to
1812                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1813                  * We then get retied later */
1814                 i=0;
1815                 if (s->ctx->client_cert_cb != NULL)
1816                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1817                 if (i < 0)
1818                         {
1819                         s->rwstate=SSL_X509_LOOKUP;
1820                         return(-1);
1821                         }
1822                 s->rwstate=SSL_NOTHING;
1823                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1824                         {
1825                         s->state=SSL3_ST_CW_CERT_B;
1826                         if (    !SSL_use_certificate(s,x509) ||
1827                                 !SSL_use_PrivateKey(s,pkey))
1828                                 i=0;
1829                         }
1830                 else if (i == 1)
1831                         {
1832                         i=0;
1833                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1834                         }
1835
1836                 if (x509 != NULL) X509_free(x509);
1837                 if (pkey != NULL) EVP_PKEY_free(pkey);
1838                 if (i == 0)
1839                         {
1840                         if (s->version == SSL3_VERSION)
1841                                 {
1842                                 s->s3->tmp.cert_req=0;
1843                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1844                                 return(1);
1845                                 }
1846                         else
1847                                 {
1848                                 s->s3->tmp.cert_req=2;
1849                                 }
1850                         }
1851
1852                 /* Ok, we have a cert */
1853                 s->state=SSL3_ST_CW_CERT_C;
1854                 }
1855
1856         if (s->state == SSL3_ST_CW_CERT_C)
1857                 {
1858                 s->state=SSL3_ST_CW_CERT_D;
1859                 l=ssl3_output_cert_chain(s,
1860                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1861                 s->init_num=(int)l;
1862                 s->init_off=0;
1863                 }
1864         /* SSL3_ST_CW_CERT_D */
1865         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1866         }
1867
1868 #define has_bits(i,m)   (((i)&(m)) == (m))
1869
1870 static int ssl3_check_cert_and_algorithm(SSL *s)
1871         {
1872         int i,idx;
1873         long algs;
1874         EVP_PKEY *pkey=NULL;
1875         SESS_CERT *sc;
1876 #ifndef OPENSSL_NO_RSA
1877         RSA *rsa;
1878 #endif
1879 #ifndef OPENSSL_NO_DH
1880         DH *dh;
1881 #endif
1882
1883         sc=s->session->sess_cert;
1884
1885         if (sc == NULL)
1886                 {
1887                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
1888                 goto err;
1889                 }
1890
1891         algs=s->s3->tmp.new_cipher->algorithms;
1892
1893         /* we don't have a certificate */
1894         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
1895                 return(1);
1896
1897 #ifndef OPENSSL_NO_RSA
1898         rsa=s->session->sess_cert->peer_rsa_tmp;
1899 #endif
1900 #ifndef OPENSSL_NO_DH
1901         dh=s->session->sess_cert->peer_dh_tmp;
1902 #endif
1903
1904         /* This is the passed certificate */
1905
1906         idx=sc->peer_cert_type;
1907         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1908         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1909         EVP_PKEY_free(pkey);
1910
1911
1912         /* Check that we have a certificate if we require one */
1913         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1914                 {
1915                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1916                 goto f_err;
1917                 }
1918 #ifndef OPENSSL_NO_DSA
1919         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1920                 {
1921                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1922                 goto f_err;
1923                 }
1924 #endif
1925 #ifndef OPENSSL_NO_RSA
1926         if ((algs & SSL_kRSA) &&
1927                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1928                 {
1929                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1930                 goto f_err;
1931                 }
1932 #endif
1933 #ifndef OPENSSL_NO_DH
1934         if ((algs & SSL_kEDH) &&
1935                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1936                 {
1937                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1938                 goto f_err;
1939                 }
1940         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1941                 {
1942                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1943                 goto f_err;
1944                 }
1945 #ifndef OPENSSL_NO_DSA
1946         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1947                 {
1948                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1949                 goto f_err;
1950                 }
1951 #endif
1952 #endif
1953
1954         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
1955                 {
1956 #ifndef OPENSSL_NO_RSA
1957                 if (algs & SSL_kRSA)
1958                         {
1959                         if (rsa == NULL
1960                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1961                                 {
1962                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1963                                 goto f_err;
1964                                 }
1965                         }
1966                 else
1967 #endif
1968 #ifndef OPENSSL_NO_DH
1969                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1970                             {
1971                             if (dh == NULL
1972                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1973                                 {
1974                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1975                                 goto f_err;
1976                                 }
1977                         }
1978                 else
1979 #endif
1980                         {
1981                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1982                         goto f_err;
1983                         }
1984                 }
1985         return(1);
1986 f_err:
1987         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1988 err:
1989         return(0);
1990         }
1991