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