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                 init=0;
 150                 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
 151                         sizeof(SSL_METHOD));
 152                 SSLv3_client_data.ssl_connect=ssl3_connect;
 153                 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
 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)
 636                {
 637                al=SSL_AD_ILLEGAL_PARAMETER;
 638                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
 639                       SSL_R_SSL3_SESSION_ID_TOO_LONG);
 640                goto f_err;
 641                }
 642
 643         if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
 644                 {
 645                 /* SSLref returns 16 :-( */
 646                 if (j < SSL2_SSL_SESSION_ID_LENGTH)
 647                         {
 648                         al=SSL_AD_ILLEGAL_PARAMETER;
 649                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
 650                         goto f_err;
 651                         }
 652                 }
 653         if (j != 0 && j == s->session->session_id_length
 654             && memcmp(p,s->session->session_id,j) == 0)
 655             {
 656             if(s->sid_ctx_length != s->session->sid_ctx_length
 657                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 658                 {
 659                 al=SSL_AD_ILLEGAL_PARAMETER;
 660                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 661                 goto f_err;
 662                 }
 663             s->hit=1;
 664             }
 665         else    /* a miss or crap from the other end */
 666                 {
 667                 /* If we were trying for session-id reuse, make a new
 668                  * SSL_SESSION so we don't stuff up other people */
 669                 s->hit=0;
 670                 if (s->session->session_id_length > 0)
 671                         {
 672                         if (!ssl_get_new_session(s,0))
 673                                 {
 674                                 al=SSL_AD_INTERNAL_ERROR;
 675                                 goto f_err;
 676                                 }
 677                         }
 678                 s->session->session_id_length=j;
 679                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 680                 }
 681         p+=j;
 682         c=ssl_get_cipher_by_char(s,p);
 683         if (c == NULL)
 684                 {
 685                 /* unknown cipher */
 686                 al=SSL_AD_ILLEGAL_PARAMETER;
 687                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 688                 goto f_err;
 689                 }
 690         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 691
 692         sk=ssl_get_ciphers_by_id(s);
 693         i=sk_SSL_CIPHER_find(sk,c);
 694         if (i < 0)
 695                 {
 696                 /* we did not say we would use this cipher */
 697                 al=SSL_AD_ILLEGAL_PARAMETER;
 698                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 699                 goto f_err;
 700                 }
 701
 702         if (s->hit && (s->session->cipher != c))
 703                 {
 704                 if (!(s->options &
 705                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 706                         {
 707                         al=SSL_AD_ILLEGAL_PARAMETER;
 708                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 709                         goto f_err;
 710                         }
 711                 }
 712         s->s3->tmp.new_cipher=c;
 713
 714         /* lets get the compression algorithm */
 715         /* COMPRESSION */
 716         j= *(p++);
 717         if (j == 0)
 718                 comp=NULL;
 719         else
 720                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 721
 722         if ((j != 0) && (comp == NULL))
 723                 {
 724                 al=SSL_AD_ILLEGAL_PARAMETER;
 725                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 726                 goto f_err;
 727                 }
 728         else
 729                 {
 730                 s->s3->tmp.new_compression=comp;
 731                 }
 732
 733         if (p != (d+n))
 734                 {
 735                 /* wrong packet length */
 736                 al=SSL_AD_DECODE_ERROR;
 737                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 738                 goto err;
 739                 }
 740
 741         return(1);
 742 f_err:
 743         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 744 err:
 745         return(-1);
 746         }
 747
 748 static int ssl3_get_server_certificate(SSL *s)
 749         {
 750         int al,i,ok,ret= -1;
 751         unsigned long n,nc,llen,l;
 752         X509 *x=NULL;
 753         unsigned char *p,*d,*q;
 754         STACK_OF(X509) *sk=NULL;
 755         SESS_CERT *sc;
 756         EVP_PKEY *pkey=NULL;
 757         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 758
 759         n=ssl3_get_message(s,
 760                 SSL3_ST_CR_CERT_A,
 761                 SSL3_ST_CR_CERT_B,
 762                 -1,
 763                 s->max_cert_list,
 764                 &ok);
 765
 766         if (!ok) return((int)n);
 767
 768         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 769                 {
 770                 s->s3->tmp.reuse_message=1;
 771                 return(1);
 772                 }
 773
 774         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 775                 {
 776                 al=SSL_AD_UNEXPECTED_MESSAGE;
 777                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 778                 goto f_err;
 779                 }
 780         d=p=(unsigned char *)s->init_msg;
 781
 782         if ((sk=sk_X509_new_null()) == NULL)
 783                 {
 784                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 785                 goto err;
 786                 }
 787
 788         n2l3(p,llen);
 789         if (llen+3 != n)
 790                 {
 791                 al=SSL_AD_DECODE_ERROR;
 792                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 793                 goto f_err;
 794                 }
 795         for (nc=0; nc<llen; )
 796                 {
 797                 n2l3(p,l);
 798                 if ((l+nc+3) > llen)
 799                         {
 800                         al=SSL_AD_DECODE_ERROR;
 801                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 802                         goto f_err;
 803                         }
 804
 805                 q=p;
 806                 x=d2i_X509(NULL,&q,l);
 807                 if (x == NULL)
 808                         {
 809                         al=SSL_AD_BAD_CERTIFICATE;
 810                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 811                         goto f_err;
 812                         }
 813                 if (q != (p+l))
 814                         {
 815                         al=SSL_AD_DECODE_ERROR;
 816                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 817                         goto f_err;
 818                         }
 819                 if (!sk_X509_push(sk,x))
 820                         {
 821                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 822                         goto err;
 823                         }
 824                 x=NULL;
 825                 nc+=l+3;
 826                 p=q;
 827                 }
 828
 829         i=ssl_verify_cert_chain(s,sk);
 830         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 831 #ifndef OPENSSL_NO_KRB5
 832                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 833                 != (SSL_aKRB5|SSL_kKRB5)
 834 #endif /* OPENSSL_NO_KRB5 */
 835                 )
 836                 {
 837                 al=ssl_verify_alarm_type(s->verify_result);
 838                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 839                 goto f_err;
 840                 }
 841         ERR_clear_error(); /* but we keep s->verify_result */
 842
 843         sc=ssl_sess_cert_new();
 844         if (sc == NULL) goto err;
 845
 846         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 847         s->session->sess_cert=sc;
 848
 849         sc->cert_chain=sk;
 850         /* Inconsistency alert: cert_chain does include the peer's
 851          * certificate, which we don't include in s3_srvr.c */
 852         x=sk_X509_value(sk,0);
 853         sk=NULL;
 854         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 855
 856         pkey=X509_get_pubkey(x);
 857
 858         /* VRS: allow null cert if auth == KRB5 */
 859         need_cert =     ((s->s3->tmp.new_cipher->algorithms
 860                         & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 861                         == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 862
 863 #ifdef KSSL_DEBUG
 864         printf("pkey,x = %p, %p\n", pkey,x);
 865         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 866         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 867                 s->s3->tmp.new_cipher->algorithms, need_cert);
 868 #endif    /* KSSL_DEBUG */
 869
 870         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 871                 {
 872                 x=NULL;
 873                 al=SSL3_AL_FATAL;
 874                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 875                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 876                 goto f_err;
 877                 }
 878
 879         i=ssl_cert_type(x,pkey);
 880         if (need_cert && i < 0)
 881                 {
 882                 x=NULL;
 883                 al=SSL3_AL_FATAL;
 884                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 885                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 886                 goto f_err;
 887                 }
 888
 889         if (need_cert)
 890                 {
 891                 sc->peer_cert_type=i;
 892                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 893                 /* Why would the following ever happen?
 894                  * We just created sc a couple of lines ago. */
 895                 if (sc->peer_pkeys[i].x509 != NULL)
 896                         X509_free(sc->peer_pkeys[i].x509);
 897                 sc->peer_pkeys[i].x509=x;
 898                 sc->peer_key= &(sc->peer_pkeys[i]);
 899
 900                 if (s->session->peer != NULL)
 901                         X509_free(s->session->peer);
 902                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 903                 s->session->peer=x;
 904                 }
 905         else
 906                 {
 907                 sc->peer_cert_type=i;
 908                 sc->peer_key= NULL;
 909
 910                 if (s->session->peer != NULL)
 911                         X509_free(s->session->peer);
 912                 s->session->peer=NULL;
 913                 }
 914         s->session->verify_result = s->verify_result;
 915
 916         x=NULL;
 917         ret=1;
 918
 919         if (0)
 920                 {
 921 f_err:
 922                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 923                 }
 924 err:
 925         EVP_PKEY_free(pkey);
 926         X509_free(x);
 927         sk_X509_pop_free(sk,X509_free);
 928         return(ret);
 929         }
 930
 931 static int ssl3_get_key_exchange(SSL *s)
 932         {
 933 #ifndef OPENSSL_NO_RSA
 934         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 935 #endif
 936         EVP_MD_CTX md_ctx;
 937         unsigned char *param,*p;
 938         int al,i,j,param_len,ok;
 939         long n,alg;
 940         EVP_PKEY *pkey=NULL;
 941 #ifndef OPENSSL_NO_RSA
 942         RSA *rsa=NULL;
 943 #endif
 944 #ifndef OPENSSL_NO_DH
 945         DH *dh=NULL;
 946 #endif
 947
 948         /* use same message size as in ssl3_get_certificate_request()
 949          * as ServerKeyExchange message may be skipped */
 950         n=ssl3_get_message(s,
 951                 SSL3_ST_CR_KEY_EXCH_A,
 952                 SSL3_ST_CR_KEY_EXCH_B,
 953                 -1,
 954                 s->max_cert_list,
 955                 &ok);
 956
 957         if (!ok) return((int)n);
 958
 959         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 960                 {
 961                 s->s3->tmp.reuse_message=1;
 962                 return(1);
 963                 }
 964
 965         param=p=(unsigned char *)s->init_msg;
 966
 967         if (s->session->sess_cert != NULL)
 968                 {
 969 #ifndef OPENSSL_NO_RSA
 970                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
 971                         {
 972                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
 973                         s->session->sess_cert->peer_rsa_tmp=NULL;
 974                         }
 975 #endif
 976 #ifndef OPENSSL_NO_DH
 977                 if (s->session->sess_cert->peer_dh_tmp)
 978                         {
 979                         DH_free(s->session->sess_cert->peer_dh_tmp);
 980                         s->session->sess_cert->peer_dh_tmp=NULL;
 981                         }
 982 #endif
 983                 }
 984         else
 985                 {
 986                 s->session->sess_cert=ssl_sess_cert_new();
 987                 }
 988
 989         param_len=0;
 990         alg=s->s3->tmp.new_cipher->algorithms;
 991         EVP_MD_CTX_init(&md_ctx);
 992
 993 #ifndef OPENSSL_NO_RSA
 994         if (alg & SSL_kRSA)
 995                 {
 996                 if ((rsa=RSA_new()) == NULL)
 997                         {
 998                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 999                         goto err;
1000                         }
1001                 n2s(p,i);
1002                 param_len=i+2;
1003                 if (param_len > n)
1004                         {
1005                         al=SSL_AD_DECODE_ERROR;
1006                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1007                         goto f_err;
1008                         }
1009                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1010                         {
1011                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1012                         goto err;
1013                         }
1014                 p+=i;
1015
1016                 n2s(p,i);
1017                 param_len+=i+2;
1018                 if (param_len > n)
1019                         {
1020                         al=SSL_AD_DECODE_ERROR;
1021                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1022                         goto f_err;
1023                         }
1024                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1025                         {
1026                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1027                         goto err;
1028                         }
1029                 p+=i;
1030                 n-=param_len;
1031
1032                 /* this should be because we are using an export cipher */
1033                 if (alg & SSL_aRSA)
1034                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1035                 else
1036                         {
1037                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1038                         goto err;
1039                         }
1040                 s->session->sess_cert->peer_rsa_tmp=rsa;
1041                 rsa=NULL;
1042                 }
1043 #else /* OPENSSL_NO_RSA */
1044         if (0)
1045                 ;
1046 #endif
1047 #ifndef OPENSSL_NO_DH
1048         else if (alg & SSL_kEDH)
1049                 {
1050                 if ((dh=DH_new()) == NULL)
1051                         {
1052                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1053                         goto err;
1054                         }
1055                 n2s(p,i);
1056                 param_len=i+2;
1057                 if (param_len > n)
1058                         {
1059                         al=SSL_AD_DECODE_ERROR;
1060                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1061                         goto f_err;
1062                         }
1063                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1064                         {
1065                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1066                         goto err;
1067                         }
1068                 p+=i;
1069
1070                 n2s(p,i);
1071                 param_len+=i+2;
1072                 if (param_len > n)
1073                         {
1074                         al=SSL_AD_DECODE_ERROR;
1075                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1076                         goto f_err;
1077                         }
1078                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1079                         {
1080                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1081                         goto err;
1082                         }
1083                 p+=i;
1084
1085                 n2s(p,i);
1086                 param_len+=i+2;
1087                 if (param_len > n)
1088                         {
1089                         al=SSL_AD_DECODE_ERROR;
1090                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1091                         goto f_err;
1092                         }
1093                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1094                         {
1095                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1096                         goto err;
1097                         }
1098                 p+=i;
1099                 n-=param_len;
1100
1101 #ifndef OPENSSL_NO_RSA
1102                 if (alg & SSL_aRSA)
1103                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1104 #else
1105                 if (0)
1106                         ;
1107 #endif
1108 #ifndef OPENSSL_NO_DSA
1109                 else if (alg & SSL_aDSS)
1110                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1111 #endif
1112                 /* else anonymous DH, so no certificate or pkey. */
1113
1114                 s->session->sess_cert->peer_dh_tmp=dh;
1115                 dh=NULL;
1116                 }
1117         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1118                 {
1119                 al=SSL_AD_ILLEGAL_PARAMETER;
1120                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1121                 goto f_err;
1122                 }
1123 #endif /* !OPENSSL_NO_DH */
1124         if (alg & SSL_aFZA)
1125                 {
1126                 al=SSL_AD_HANDSHAKE_FAILURE;
1127                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1128                 goto f_err;
1129                 }
1130
1131
1132         /* p points to the next byte, there are 'n' bytes left */
1133
1134
1135         /* if it was signed, check the signature */
1136         if (pkey != NULL)
1137                 {
1138                 n2s(p,i);
1139                 n-=2;
1140                 j=EVP_PKEY_size(pkey);
1141
1142                 if ((i != n) || (n > j) || (n <= 0))
1143                         {
1144                         /* wrong packet length */
1145                         al=SSL_AD_DECODE_ERROR;
1146                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1147                         goto f_err;
1148                         }
1149
1150 #ifndef OPENSSL_NO_RSA
1151                 if (pkey->type == EVP_PKEY_RSA)
1152                         {
1153                         int num;
1154
1155                         j=0;
1156                         q=md_buf;
1157                         for (num=2; num > 0; num--)
1158                                 {
1159                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1160                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1161                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1162                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1163                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1164                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1165                                 q+=i;
1166                                 j+=i;
1167                                 }
1168                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1169                                                                 pkey->pkey.rsa);
1170                         if (i < 0)
1171                                 {
1172                                 al=SSL_AD_DECRYPT_ERROR;
1173                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1174                                 goto f_err;
1175                                 }
1176                         if (i == 0)
1177                                 {
1178                                 /* bad signature */
1179                                 al=SSL_AD_DECRYPT_ERROR;
1180                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1181                                 goto f_err;
1182                                 }
1183                         }
1184                 else
1185 #endif
1186 #ifndef OPENSSL_NO_DSA
1187                         if (pkey->type == EVP_PKEY_DSA)
1188                         {
1189                         /* lets do DSS */
1190                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1191                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1192                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1193                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1194                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1195                                 {
1196                                 /* bad signature */
1197                                 al=SSL_AD_DECRYPT_ERROR;
1198                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1199                                 goto f_err;
1200                                 }
1201                         }
1202                 else
1203 #endif
1204                         {
1205                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1206                         goto err;
1207                         }
1208                 }
1209         else
1210                 {
1211                 /* still data left over */
1212                 if (!(alg & SSL_aNULL))
1213                         {
1214                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1215                         goto err;
1216                         }
1217                 if (n != 0)
1218                         {
1219                         al=SSL_AD_DECODE_ERROR;
1220                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1221                         goto f_err;
1222                         }
1223                 }
1224         EVP_PKEY_free(pkey);
1225         EVP_MD_CTX_cleanup(&md_ctx);
1226         return(1);
1227 f_err:
1228         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1229 err:
1230         EVP_PKEY_free(pkey);
1231 #ifndef OPENSSL_NO_RSA
1232         if (rsa != NULL)
1233                 RSA_free(rsa);
1234 #endif
1235 #ifndef OPENSSL_NO_DH
1236         if (dh != NULL)
1237                 DH_free(dh);
1238 #endif
1239         EVP_MD_CTX_cleanup(&md_ctx);
1240         return(-1);
1241         }
1242
1243 static int ssl3_get_certificate_request(SSL *s)
1244         {
1245         int ok,ret=0;
1246         unsigned long n,nc,l;
1247         unsigned int llen,ctype_num,i;
1248         X509_NAME *xn=NULL;
1249         unsigned char *p,*d,*q;
1250         STACK_OF(X509_NAME) *ca_sk=NULL;
1251
1252         n=ssl3_get_message(s,
1253                 SSL3_ST_CR_CERT_REQ_A,
1254                 SSL3_ST_CR_CERT_REQ_B,
1255                 -1,
1256                 s->max_cert_list,
1257                 &ok);
1258
1259         if (!ok) return((int)n);
1260
1261         s->s3->tmp.cert_req=0;
1262
1263         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1264                 {
1265                 s->s3->tmp.reuse_message=1;
1266                 return(1);
1267                 }
1268
1269         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1270                 {
1271                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1272                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1273                 goto err;
1274                 }
1275
1276         /* TLS does not like anon-DH with client cert */
1277         if (s->version > SSL3_VERSION)
1278                 {
1279                 l=s->s3->tmp.new_cipher->algorithms;
1280                 if (l & SSL_aNULL)
1281                         {
1282                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1283                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1284                         goto err;
1285                         }
1286                 }
1287
1288         d=p=(unsigned char *)s->init_msg;
1289
1290         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1291                 {
1292                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1293                 goto err;
1294                 }
1295
1296         /* get the certificate types */
1297         ctype_num= *(p++);
1298         if (ctype_num > SSL3_CT_NUMBER)
1299                 ctype_num=SSL3_CT_NUMBER;
1300         for (i=0; i<ctype_num; i++)
1301                 s->s3->tmp.ctype[i]= p[i];
1302         p+=ctype_num;
1303
1304         /* get the CA RDNs */
1305         n2s(p,llen);
1306 #if 0
1307 {
1308 FILE *out;
1309 out=fopen("/tmp/vsign.der","w");
1310 fwrite(p,1,llen,out);
1311 fclose(out);
1312 }
1313 #endif
1314
1315         if ((llen+ctype_num+2+1) != n)
1316                 {
1317                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1318                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1319                 goto err;
1320                 }
1321
1322         for (nc=0; nc<llen; )
1323                 {
1324                 n2s(p,l);
1325                 if ((l+nc+2) > llen)
1326                         {
1327                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1328                                 goto cont; /* netscape bugs */
1329                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1330                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1331                         goto err;
1332                         }
1333
1334                 q=p;
1335
1336                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1337                         {
1338                         /* If netscape tolerance is on, ignore errors */
1339                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1340                                 goto cont;
1341                         else
1342                                 {
1343                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1344                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1345                                 goto err;
1346                                 }
1347                         }
1348
1349                 if (q != (p+l))
1350                         {
1351                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1352                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1353                         goto err;
1354                         }
1355                 if (!sk_X509_NAME_push(ca_sk,xn))
1356                         {
1357                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1358                         goto err;
1359                         }
1360
1361                 p+=l;
1362                 nc+=l+2;
1363                 }
1364
1365         if (0)
1366                 {
1367 cont:
1368                 ERR_clear_error();
1369                 }
1370
1371         /* we should setup a certificate to return.... */
1372         s->s3->tmp.cert_req=1;
1373         s->s3->tmp.ctype_num=ctype_num;
1374         if (s->s3->tmp.ca_names != NULL)
1375                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1376         s->s3->tmp.ca_names=ca_sk;
1377         ca_sk=NULL;
1378
1379         ret=1;
1380 err:
1381         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1382         return(ret);
1383         }
1384
1385 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1386         {
1387         return(X509_NAME_cmp(*a,*b));
1388         }
1389
1390 static int ssl3_get_server_done(SSL *s)
1391         {
1392         int ok,ret=0;
1393         long n;
1394
1395         n=ssl3_get_message(s,
1396                 SSL3_ST_CR_SRVR_DONE_A,
1397                 SSL3_ST_CR_SRVR_DONE_B,
1398                 SSL3_MT_SERVER_DONE,
1399                 30, /* should be very small, like 0 :-) */
1400                 &ok);
1401
1402         if (!ok) return((int)n);
1403         if (n > 0)
1404                 {
1405                 /* should contain no data */
1406                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1407                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1408                 return -1;
1409                 }
1410         ret=1;
1411         return(ret);
1412         }
1413
1414 static int ssl3_send_client_key_exchange(SSL *s)
1415         {
1416         unsigned char *p,*d;
1417         int n;
1418         unsigned long l;
1419 #ifndef OPENSSL_NO_RSA
1420         unsigned char *q;
1421         EVP_PKEY *pkey=NULL;
1422 #endif
1423 #ifndef OPENSSL_NO_KRB5
1424         KSSL_ERR kssl_err;
1425 #endif /* OPENSSL_NO_KRB5 */
1426
1427         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1428                 {
1429                 d=(unsigned char *)s->init_buf->data;
1430                 p= &(d[4]);
1431
1432                 l=s->s3->tmp.new_cipher->algorithms;
1433
1434                 /* Fool emacs indentation */
1435                 if (0) {}
1436 #ifndef OPENSSL_NO_RSA
1437                 else if (l & SSL_kRSA)
1438                         {
1439                         RSA *rsa;
1440                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1441
1442                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1443                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1444                         else
1445                                 {
1446                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1447                                 if ((pkey == NULL) ||
1448                                         (pkey->type != EVP_PKEY_RSA) ||
1449                                         (pkey->pkey.rsa == NULL))
1450                                         {
1451                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1452                                         goto err;
1453                                         }
1454                                 rsa=pkey->pkey.rsa;
1455                                 EVP_PKEY_free(pkey);
1456                                 }
1457
1458                         tmp_buf[0]=s->client_version>>8;
1459                         tmp_buf[1]=s->client_version&0xff;
1460                         if (RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2) <= 0)
1461                                         goto err;
1462
1463                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1464
1465                         q=p;
1466                         /* Fix buf for TLS and beyond */
1467                         if (s->version > SSL3_VERSION)
1468                                 p+=2;
1469                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1470                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1471 #ifdef PKCS1_CHECK
1472                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1473                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1474 #endif
1475                         if (n <= 0)
1476                                 {
1477                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1478                                 goto err;
1479                                 }
1480
1481                         /* Fix buf for TLS and beyond */
1482                         if (s->version > SSL3_VERSION)
1483                                 {
1484                                 s2n(n,q);
1485                                 n+=2;
1486                                 }
1487
1488                         s->session->master_key_length=
1489                                 s->method->ssl3_enc->generate_master_secret(s,
1490                                         s->session->master_key,
1491                                         tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1492                         memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1493                         }
1494 #endif
1495 #ifndef OPENSSL_NO_KRB5
1496                 else if (l & SSL_kKRB5)
1497                         {
1498                         krb5_error_code krb5rc;
1499                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1500                         /*  krb5_data   krb5_ap_req;  */
1501                         krb5_data       *enc_ticket;
1502                         krb5_data       authenticator, *authp = NULL;
1503                         EVP_CIPHER_CTX  ciph_ctx;
1504                         EVP_CIPHER      *enc = NULL;
1505                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1506                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1507                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1508                                                 + EVP_MAX_IV_LENGTH];
1509                         int             padl, outl = sizeof(epms);
1510
1511                         EVP_CIPHER_CTX_init(&ciph_ctx);
1512
1513 #ifdef KSSL_DEBUG
1514                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1515                                 l, SSL_kKRB5);
1516 #endif  /* KSSL_DEBUG */
1517
1518                         authp = NULL;
1519 #ifdef KRB5SENDAUTH
1520                         if (KRB5SENDAUTH)  authp = &authenticator;
1521 #endif  /* KRB5SENDAUTH */
1522
1523                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1524                                 &kssl_err);
1525                         enc = kssl_map_enc(kssl_ctx->enctype);
1526                         if (enc == NULL)
1527                             goto err;
1528 #ifdef KSSL_DEBUG
1529                         {
1530                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1531                         if (krb5rc && kssl_err.text)
1532                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1533                         }
1534 #endif  /* KSSL_DEBUG */
1535
1536                         if (krb5rc)
1537                                 {
1538                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1539                                                 SSL_AD_HANDSHAKE_FAILURE);
1540                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1541                                                 kssl_err.reason);
1542                                 goto err;
1543                                 }
1544
1545                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1546                         **  in place of RFC 2712 KerberosWrapper, as in:
1547                         **
1548                         **  Send ticket (copy to *p, set n = length)
1549                         **  n = krb5_ap_req.length;
1550                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1551                         **  if (krb5_ap_req.data)
1552                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1553                         **
1554                         **  Now using real RFC 2712 KerberosWrapper
1555                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1556                         **  Note: 2712 "opaque" types are here replaced
1557                         **  with a 2-byte length followed by the value.
1558                         **  Example:
1559                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1560                         **  Where "xx xx" = length bytes.  Shown here with
1561                         **  optional authenticator omitted.
1562                         */
1563
1564                         /*  KerberosWrapper.Ticket              */
1565                         s2n(enc_ticket->length,p);
1566                         memcpy(p, enc_ticket->data, enc_ticket->length);
1567                         p+= enc_ticket->length;
1568                         n = enc_ticket->length + 2;
1569
1570                         /*  KerberosWrapper.Authenticator       */
1571                         if (authp  &&  authp->length)
1572                                 {
1573                                 s2n(authp->length,p);
1574                                 memcpy(p, authp->data, authp->length);
1575                                 p+= authp->length;
1576                                 n+= authp->length + 2;
1577
1578                                 free(authp->data);
1579                                 authp->data = NULL;
1580                                 authp->length = 0;
1581                                 }
1582                         else
1583                                 {
1584                                 s2n(0,p);/*  null authenticator length  */
1585                                 n+=2;
1586                                 }
1587
1588                         if (RAND_bytes(tmp_buf,SSL_MAX_MASTER_KEY_LENGTH) <= 0)
1589                             goto err;
1590
1591                         /*  20010420 VRS.  Tried it this way; failed.
1592                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1593                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1594                         **                              kssl_ctx->length);
1595                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1596                         */
1597
1598                         memset(iv, 0, EVP_MAX_IV_LENGTH);  /* per RFC 1510 */
1599                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1600                                 kssl_ctx->key,iv);
1601                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1602                                 SSL_MAX_MASTER_KEY_LENGTH);
1603                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1604                         outl += padl;
1605                         if (outl > sizeof epms)
1606                                 {
1607                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1608                                 goto err;
1609                                 }
1610                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1611
1612                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1613                         s2n(outl,p);
1614                         memcpy(p, epms, outl);
1615                         p+=outl;
1616                         n+=outl + 2;
1617
1618                         s->session->master_key_length=
1619                                 s->method->ssl3_enc->generate_master_secret(s,
1620                                         s->session->master_key,
1621                                         tmp_buf, SSL_MAX_MASTER_KEY_LENGTH);
1622
1623                         memset(tmp_buf, 0, SSL_MAX_MASTER_KEY_LENGTH);
1624                         memset(epms, 0, outl);
1625                         }
1626 #endif
1627 #ifndef OPENSSL_NO_DH
1628                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1629                         {
1630                         DH *dh_srvr,*dh_clnt;
1631
1632                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1633                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1634                         else
1635                                 {
1636                                 /* we get them from the cert */
1637                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1638                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1639                                 goto err;
1640                                 }
1641
1642                         /* generate a new random key */
1643                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1644                                 {
1645                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1646                                 goto err;
1647                                 }
1648                         if (!DH_generate_key(dh_clnt))
1649                                 {
1650                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1651                                 goto err;
1652                                 }
1653
1654                         /* use the 'p' output buffer for the DH key, but
1655                          * make sure to clear it out afterwards */
1656
1657                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1658
1659                         if (n <= 0)
1660                                 {
1661                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1662                                 goto err;
1663                                 }
1664
1665                         /* generate master key from the result */
1666                         s->session->master_key_length=
1667                                 s->method->ssl3_enc->generate_master_secret(s,
1668                                         s->session->master_key,p,n);
1669                         /* clean up */
1670                         memset(p,0,n);
1671
1672                         /* send off the data */
1673                         n=BN_num_bytes(dh_clnt->pub_key);
1674                         s2n(n,p);
1675                         BN_bn2bin(dh_clnt->pub_key,p);
1676                         n+=2;
1677
1678                         DH_free(dh_clnt);
1679
1680                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1681                         }
1682 #endif
1683                 else
1684                         {
1685                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1686                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1687                         goto err;
1688                         }
1689
1690                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1691                 l2n3(n,d);
1692
1693                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1694                 /* number of bytes to write */
1695                 s->init_num=n+4;
1696                 s->init_off=0;
1697                 }
1698
1699         /* SSL3_ST_CW_KEY_EXCH_B */
1700         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1701 err:
1702         return(-1);
1703         }
1704
1705 static int ssl3_send_client_verify(SSL *s)
1706         {
1707         unsigned char *p,*d;
1708         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1709         EVP_PKEY *pkey;
1710 #ifndef OPENSSL_NO_RSA
1711         unsigned u=0;
1712 #endif
1713         unsigned long n;
1714 #ifndef OPENSSL_NO_DSA
1715         int j;
1716 #endif
1717
1718         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1719                 {
1720                 d=(unsigned char *)s->init_buf->data;
1721                 p= &(d[4]);
1722                 pkey=s->cert->key->privatekey;
1723
1724                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1725                         &(data[MD5_DIGEST_LENGTH]));
1726
1727 #ifndef OPENSSL_NO_RSA
1728                 if (pkey->type == EVP_PKEY_RSA)
1729                         {
1730                         s->method->ssl3_enc->cert_verify_mac(s,
1731                                 &(s->s3->finish_dgst1),&(data[0]));
1732                         if (RSA_sign(NID_md5_sha1, data,
1733                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1734                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1735                                 {
1736                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1737                                 goto err;
1738                                 }
1739                         s2n(u,p);
1740                         n=u+2;
1741                         }
1742                 else
1743 #endif
1744 #ifndef OPENSSL_NO_DSA
1745                         if (pkey->type == EVP_PKEY_DSA)
1746                         {
1747                         if (!DSA_sign(pkey->save_type,
1748                                 &(data[MD5_DIGEST_LENGTH]),
1749                                 SHA_DIGEST_LENGTH,&(p[2]),
1750                                 (unsigned int *)&j,pkey->pkey.dsa))
1751                                 {
1752                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1753                                 goto err;
1754                                 }
1755                         s2n(j,p);
1756                         n=j+2;
1757                         }
1758                 else
1759 #endif
1760                         {
1761                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1762                         goto err;
1763                         }
1764                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1765                 l2n3(n,d);
1766
1767                 s->init_num=(int)n+4;
1768                 s->init_off=0;
1769                 }
1770         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1771 err:
1772         return(-1);
1773         }
1774
1775 static int ssl3_send_client_certificate(SSL *s)
1776         {
1777         X509 *x509=NULL;
1778         EVP_PKEY *pkey=NULL;
1779         int i;
1780         unsigned long l;
1781
1782         if (s->state == SSL3_ST_CW_CERT_A)
1783                 {
1784                 if ((s->cert == NULL) ||
1785                         (s->cert->key->x509 == NULL) ||
1786                         (s->cert->key->privatekey == NULL))
1787                         s->state=SSL3_ST_CW_CERT_B;
1788                 else
1789                         s->state=SSL3_ST_CW_CERT_C;
1790                 }
1791
1792         /* We need to get a client cert */
1793         if (s->state == SSL3_ST_CW_CERT_B)
1794                 {
1795                 /* If we get an error, we need to
1796                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1797                  * We then get retied later */
1798                 i=0;
1799                 if (s->ctx->client_cert_cb != NULL)
1800                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1801                 if (i < 0)
1802                         {
1803                         s->rwstate=SSL_X509_LOOKUP;
1804                         return(-1);
1805                         }
1806                 s->rwstate=SSL_NOTHING;
1807                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1808                         {
1809                         s->state=SSL3_ST_CW_CERT_B;
1810                         if (    !SSL_use_certificate(s,x509) ||
1811                                 !SSL_use_PrivateKey(s,pkey))
1812                                 i=0;
1813                         }
1814                 else if (i == 1)
1815                         {
1816                         i=0;
1817                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1818                         }
1819
1820                 if (x509 != NULL) X509_free(x509);
1821                 if (pkey != NULL) EVP_PKEY_free(pkey);
1822                 if (i == 0)
1823                         {
1824                         if (s->version == SSL3_VERSION)
1825                                 {
1826                                 s->s3->tmp.cert_req=0;
1827                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1828                                 return(1);
1829                                 }
1830                         else
1831                                 {
1832                                 s->s3->tmp.cert_req=2;
1833                                 }
1834                         }
1835
1836                 /* Ok, we have a cert */
1837                 s->state=SSL3_ST_CW_CERT_C;
1838                 }
1839
1840         if (s->state == SSL3_ST_CW_CERT_C)
1841                 {
1842                 s->state=SSL3_ST_CW_CERT_D;
1843                 l=ssl3_output_cert_chain(s,
1844                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1845                 s->init_num=(int)l;
1846                 s->init_off=0;
1847                 }
1848         /* SSL3_ST_CW_CERT_D */
1849         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1850         }
1851
1852 #define has_bits(i,m)   (((i)&(m)) == (m))
1853
1854 static int ssl3_check_cert_and_algorithm(SSL *s)
1855         {
1856         int i,idx;
1857         long algs;
1858         EVP_PKEY *pkey=NULL;
1859         SESS_CERT *sc;
1860 #ifndef OPENSSL_NO_RSA
1861         RSA *rsa;
1862 #endif
1863 #ifndef OPENSSL_NO_DH
1864         DH *dh;
1865 #endif
1866
1867         sc=s->session->sess_cert;
1868
1869         if (sc == NULL)
1870                 {
1871                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
1872                 goto err;
1873                 }
1874
1875         algs=s->s3->tmp.new_cipher->algorithms;
1876
1877         /* we don't have a certificate */
1878         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
1879                 return(1);
1880
1881 #ifndef OPENSSL_NO_RSA
1882         rsa=s->session->sess_cert->peer_rsa_tmp;
1883 #endif
1884 #ifndef OPENSSL_NO_DH
1885         dh=s->session->sess_cert->peer_dh_tmp;
1886 #endif
1887
1888         /* This is the passed certificate */
1889
1890         idx=sc->peer_cert_type;
1891         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1892         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1893         EVP_PKEY_free(pkey);
1894
1895
1896         /* Check that we have a certificate if we require one */
1897         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1898                 {
1899                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1900                 goto f_err;
1901                 }
1902 #ifndef OPENSSL_NO_DSA
1903         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1904                 {
1905                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1906                 goto f_err;
1907                 }
1908 #endif
1909 #ifndef OPENSSL_NO_RSA
1910         if ((algs & SSL_kRSA) &&
1911                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1912                 {
1913                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1914                 goto f_err;
1915                 }
1916 #endif
1917 #ifndef OPENSSL_NO_DH
1918         if ((algs & SSL_kEDH) &&
1919                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1920                 {
1921                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1922                 goto f_err;
1923                 }
1924         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1925                 {
1926                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1927                 goto f_err;
1928                 }
1929 #ifndef OPENSSL_NO_DSA
1930         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1931                 {
1932                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1933                 goto f_err;
1934                 }
1935 #endif
1936 #endif
1937
1938         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
1939                 {
1940 #ifndef OPENSSL_NO_RSA
1941                 if (algs & SSL_kRSA)
1942                         {
1943                         if (rsa == NULL
1944                             || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1945                                 {
1946                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1947                                 goto f_err;
1948                                 }
1949                         }
1950                 else
1951 #endif
1952 #ifndef OPENSSL_NO_DH
1953                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1954                             {
1955                             if (dh == NULL
1956                                 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1957                                 {
1958                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1959                                 goto f_err;
1960                                 }
1961                         }
1962                 else
1963 #endif
1964                         {
1965                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1966                         goto f_err;
1967                         }
1968                 }
1969         return(1);
1970 f_err:
1971         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1972 err:
1973         return(0);
1974         }
1975