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