ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include <stdio.h>
 113 #include "ssl_locl.h"
 114 #include "kssl_lcl.h"
 115 #include <openssl/buffer.h>
 116 #include <openssl/rand.h>
 117 #include <openssl/objects.h>
 118 #include <openssl/evp.h>
 119 #include <openssl/md5.h>
 120 #include "cryptlib.h"
 121
 122 static SSL_METHOD *ssl3_get_client_method(int ver);
 123 static int ssl3_client_hello(SSL *s);
 124 static int ssl3_get_server_hello(SSL *s);
 125 static int ssl3_get_certificate_request(SSL *s);
 126 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 127 static int ssl3_get_server_done(SSL *s);
 128 static int ssl3_send_client_verify(SSL *s);
 129 static int ssl3_send_client_certificate(SSL *s);
 130 static int ssl3_send_client_key_exchange(SSL *s);
 131 static int ssl3_get_key_exchange(SSL *s);
 132 static int ssl3_get_server_certificate(SSL *s);
 133 static int ssl3_check_cert_and_algorithm(SSL *s);
 134 static SSL_METHOD *ssl3_get_client_method(int ver)
 135         {
 136         if (ver == SSL3_VERSION)
 137                 return(SSLv3_client_method());
 138         else
 139                 return(NULL);
 140         }
 141
 142 SSL_METHOD *SSLv3_client_method(void)
 143         {
 144         static int init=1;
 145         static SSL_METHOD SSLv3_client_data;
 146
 147         if (init)
 148                 {
 149                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 150
 151                 if (init)
 152                         {
 153                         memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
 154                                 sizeof(SSL_METHOD));
 155                         SSLv3_client_data.ssl_connect=ssl3_connect;
 156                         SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
 157                         init=0;
 158                         }
 159
 160                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 161                 }
 162         return(&SSLv3_client_data);
 163         }
 164
 165 int ssl3_connect(SSL *s)
 166         {
 167         BUF_MEM *buf;
 168         unsigned long Time=time(NULL),l;
 169         long num1;
 170         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 171         int ret= -1;
 172         int new_state,state,skip=0;;
 173
 174         RAND_add(&Time,sizeof(Time),0);
 175         ERR_clear_error();
 176         clear_sys_error();
 177
 178         if (s->info_callback != NULL)
 179                 cb=s->info_callback;
 180         else if (s->ctx->info_callback != NULL)
 181                 cb=s->ctx->info_callback;
 182
 183         s->in_handshake++;
 184         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 185
 186         for (;;)
 187                 {
 188                 state=s->state;
 189
 190                 switch(s->state)
 191                         {
 192                 case SSL_ST_RENEGOTIATE:
 193                         s->new_session=1;
 194                         s->state=SSL_ST_CONNECT;
 195                         s->ctx->stats.sess_connect_renegotiate++;
 196                         /* break */
 197                 case SSL_ST_BEFORE:
 198                 case SSL_ST_CONNECT:
 199                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 200                 case SSL_ST_OK|SSL_ST_CONNECT:
 201
 202                         s->server=0;
 203                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 204
 205                         if ((s->version & 0xff00 ) != 0x0300)
 206                                 {
 207                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 208                                 ret = -1;
 209                                 goto end;
 210                                 }
 211
 212                         /* s->version=SSL3_VERSION; */
 213                         s->type=SSL_ST_CONNECT;
 214
 215                         if (s->init_buf == NULL)
 216                                 {
 217                                 if ((buf=BUF_MEM_new()) == NULL)
 218                                         {
 219                                         ret= -1;
 220                                         goto end;
 221                                         }
 222                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 223                                         {
 224                                         ret= -1;
 225                                         goto end;
 226                                         }
 227                                 s->init_buf=buf;
 228                                 }
 229
 230                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 231
 232                         /* setup buffing BIO */
 233                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 234
 235                         /* don't push the buffering BIO quite yet */
 236
 237                         ssl3_init_finished_mac(s);
 238
 239                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 240                         s->ctx->stats.sess_connect++;
 241                         s->init_num=0;
 242                         break;
 243
 244                 case SSL3_ST_CW_CLNT_HELLO_A:
 245                 case SSL3_ST_CW_CLNT_HELLO_B:
 246
 247                         s->shutdown=0;
 248                         ret=ssl3_client_hello(s);
 249                         if (ret <= 0) goto end;
 250                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 251                         s->init_num=0;
 252
 253                         /* turn on buffering for the next lot of output */
 254                         if (s->bbio != s->wbio)
 255                                 s->wbio=BIO_push(s->bbio,s->wbio);
 256
 257                         break;
 258
 259                 case SSL3_ST_CR_SRVR_HELLO_A:
 260                 case SSL3_ST_CR_SRVR_HELLO_B:
 261                         ret=ssl3_get_server_hello(s);
 262                         if (ret <= 0) goto end;
 263                         if (s->hit)
 264                                 s->state=SSL3_ST_CR_FINISHED_A;
 265                         else
 266                                 s->state=SSL3_ST_CR_CERT_A;
 267                         s->init_num=0;
 268                         break;
 269
 270                 case SSL3_ST_CR_CERT_A:
 271                 case SSL3_ST_CR_CERT_B:
 272                         /* Check if it is anon DH */
 273                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 274                                 {
 275                                 ret=ssl3_get_server_certificate(s);
 276                                 if (ret <= 0) goto end;
 277                                 }
 278                         else
 279                                 skip=1;
 280                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 281                         s->init_num=0;
 282                         break;
 283
 284                 case SSL3_ST_CR_KEY_EXCH_A:
 285                 case SSL3_ST_CR_KEY_EXCH_B:
 286                         ret=ssl3_get_key_exchange(s);
 287                         if (ret <= 0) goto end;
 288                         s->state=SSL3_ST_CR_CERT_REQ_A;
 289                         s->init_num=0;
 290
 291                         /* at this point we check that we have the
 292                          * required stuff from the server */
 293                         if (!ssl3_check_cert_and_algorithm(s))
 294                                 {
 295                                 ret= -1;
 296                                 goto end;
 297                                 }
 298                         break;
 299
 300                 case SSL3_ST_CR_CERT_REQ_A:
 301                 case SSL3_ST_CR_CERT_REQ_B:
 302                         ret=ssl3_get_certificate_request(s);
 303                         if (ret <= 0) goto end;
 304                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 305                         s->init_num=0;
 306                         break;
 307
 308                 case SSL3_ST_CR_SRVR_DONE_A:
 309                 case SSL3_ST_CR_SRVR_DONE_B:
 310                         ret=ssl3_get_server_done(s);
 311                         if (ret <= 0) goto end;
 312                         if (s->s3->tmp.cert_req)
 313                                 s->state=SSL3_ST_CW_CERT_A;
 314                         else
 315                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 316                         s->init_num=0;
 317
 318                         break;
 319
 320                 case SSL3_ST_CW_CERT_A:
 321                 case SSL3_ST_CW_CERT_B:
 322                 case SSL3_ST_CW_CERT_C:
 323                 case SSL3_ST_CW_CERT_D:
 324                         ret=ssl3_send_client_certificate(s);
 325                         if (ret <= 0) goto end;
 326                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 327                         s->init_num=0;
 328                         break;
 329
 330                 case SSL3_ST_CW_KEY_EXCH_A:
 331                 case SSL3_ST_CW_KEY_EXCH_B:
 332                         ret=ssl3_send_client_key_exchange(s);
 333                         if (ret <= 0) goto end;
 334                         l=s->s3->tmp.new_cipher->algorithms;
 335                         /* EAY EAY EAY need to check for DH fix cert
 336                          * sent back */
 337                         /* For TLS, cert_req is set to 2, so a cert chain
 338                          * of nothing is sent, but no verify packet is sent */
 339                         if (s->s3->tmp.cert_req == 1)
 340                                 {
 341                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 342                                 }
 343                         else
 344                                 {
 345                                 s->state=SSL3_ST_CW_CHANGE_A;
 346                                 s->s3->change_cipher_spec=0;
 347                                 }
 348
 349                         s->init_num=0;
 350                         break;
 351
 352                 case SSL3_ST_CW_CERT_VRFY_A:
 353                 case SSL3_ST_CW_CERT_VRFY_B:
 354                         ret=ssl3_send_client_verify(s);
 355                         if (ret <= 0) goto end;
 356                         s->state=SSL3_ST_CW_CHANGE_A;
 357                         s->init_num=0;
 358                         s->s3->change_cipher_spec=0;
 359                         break;
 360
 361                 case SSL3_ST_CW_CHANGE_A:
 362                 case SSL3_ST_CW_CHANGE_B:
 363                         ret=ssl3_send_change_cipher_spec(s,
 364                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 365                         if (ret <= 0) goto end;
 366                         s->state=SSL3_ST_CW_FINISHED_A;
 367                         s->init_num=0;
 368
 369                         s->session->cipher=s->s3->tmp.new_cipher;
 370                         if (s->s3->tmp.new_compression == NULL)
 371                                 s->session->compress_meth=0;
 372                         else
 373                                 s->session->compress_meth=
 374                                         s->s3->tmp.new_compression->id;
 375                         if (!s->method->ssl3_enc->setup_key_block(s))
 376                                 {
 377                                 ret= -1;
 378                                 goto end;
 379                                 }
 380
 381                         if (!s->method->ssl3_enc->change_cipher_state(s,
 382                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 383                                 {
 384                                 ret= -1;
 385                                 goto end;
 386                                 }
 387
 388                         break;
 389
 390                 case SSL3_ST_CW_FINISHED_A:
 391                 case SSL3_ST_CW_FINISHED_B:
 392                         ret=ssl3_send_finished(s,
 393                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 394                                 s->method->ssl3_enc->client_finished_label,
 395                                 s->method->ssl3_enc->client_finished_label_len);
 396                         if (ret <= 0) goto end;
 397                         s->state=SSL3_ST_CW_FLUSH;
 398
 399                         /* clear flags */
 400                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 401                         if (s->hit)
 402                                 {
 403                                 s->s3->tmp.next_state=SSL_ST_OK;
 404                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 405                                         {
 406                                         s->state=SSL_ST_OK;
 407                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 408                                         s->s3->delay_buf_pop_ret=0;
 409                                         }
 410                                 }
 411                         else
 412                                 {
 413                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 414                                 }
 415                         s->init_num=0;
 416                         break;
 417
 418                 case SSL3_ST_CR_FINISHED_A:
 419                 case SSL3_ST_CR_FINISHED_B:
 420
 421                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 422                                 SSL3_ST_CR_FINISHED_B);
 423                         if (ret <= 0) goto end;
 424
 425                         if (s->hit)
 426                                 s->state=SSL3_ST_CW_CHANGE_A;
 427                         else
 428                                 s->state=SSL_ST_OK;
 429                         s->init_num=0;
 430                         break;
 431
 432                 case SSL3_ST_CW_FLUSH:
 433                         /* number of bytes to be flushed */
 434                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 435                         if (num1 > 0)
 436                                 {
 437                                 s->rwstate=SSL_WRITING;
 438                                 num1=BIO_flush(s->wbio);
 439                                 if (num1 <= 0) { ret= -1; goto end; }
 440                                 s->rwstate=SSL_NOTHING;
 441                                 }
 442
 443                         s->state=s->s3->tmp.next_state;
 444                         break;
 445
 446                 case SSL_ST_OK:
 447                         /* clean a few things up */
 448                         ssl3_cleanup_key_block(s);
 449
 450                         if (s->init_buf != NULL)
 451                                 {
 452                                 BUF_MEM_free(s->init_buf);
 453                                 s->init_buf=NULL;
 454                                 }
 455
 456                         /* If we are not 'joining' the last two packets,
 457                          * remove the buffering now */
 458                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 459                                 ssl_free_wbio_buffer(s);
 460                         /* else do it later in ssl3_write */
 461
 462                         s->init_num=0;
 463                         s->new_session=0;
 464
 465                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 466                         if (s->hit) s->ctx->stats.sess_hit++;
 467
 468                         ret=1;
 469                         /* s->server=0; */
 470                         s->handshake_func=ssl3_connect;
 471                         s->ctx->stats.sess_connect_good++;
 472
 473                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 474
 475                         goto end;
 476                         /* break; */
 477
 478                 default:
 479                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 480                         ret= -1;
 481                         goto end;
 482                         /* break; */
 483                         }
 484
 485                 /* did we do anything */
 486                 if (!s->s3->tmp.reuse_message && !skip)
 487                         {
 488                         if (s->debug)
 489                                 {
 490                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 491                                         goto end;
 492                                 }
 493
 494                         if ((cb != NULL) && (s->state != state))
 495                                 {
 496                                 new_state=s->state;
 497                                 s->state=state;
 498                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 499                                 s->state=new_state;
 500                                 }
 501                         }
 502                 skip=0;
 503                 }
 504 end:
 505         s->in_handshake--;
 506         if (cb != NULL)
 507                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 508         return(ret);
 509         }
 510
 511
 512 static int ssl3_client_hello(SSL *s)
 513         {
 514         unsigned char *buf;
 515         unsigned char *p,*d;
 516         int i,j;
 517         unsigned long Time,l;
 518         SSL_COMP *comp;
 519
 520         buf=(unsigned char *)s->init_buf->data;
 521         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 522                 {
 523                 if ((s->session == NULL) ||
 524                         (s->session->ssl_version != s->version) ||
 525                         (s->session->not_resumable))
 526                         {
 527                         if (!ssl_get_new_session(s,0))
 528                                 goto err;
 529                         }
 530                 /* else use the pre-loaded session */
 531
 532                 p=s->s3->client_random;
 533                 Time=time(NULL);                        /* Time */
 534                 l2n(Time,p);
 535                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 536
 537                 /* Do the message type and length last */
 538                 d=p= &(buf[4]);
 539
 540                 *(p++)=s->version>>8;
 541                 *(p++)=s->version&0xff;
 542                 s->client_version=s->version;
 543
 544                 /* Random stuff */
 545                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 546                 p+=SSL3_RANDOM_SIZE;
 547
 548                 /* Session ID */
 549                 if (s->new_session)
 550                         i=0;
 551                 else
 552                         i=s->session->session_id_length;
 553                 *(p++)=i;
 554                 if (i != 0)
 555                         {
 556                         if (i > sizeof s->session->session_id)
 557                                 {
 558                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 559                                 goto err;
 560                                 }
 561                         memcpy(p,s->session->session_id,i);
 562                         p+=i;
 563                         }
 564
 565                 /* Ciphers supported */
 566                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 567                 if (i == 0)
 568                         {
 569                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 570                         goto err;
 571                         }
 572                 s2n(i,p);
 573                 p+=i;
 574
 575                 /* COMPRESSION */
 576                 if (s->ctx->comp_methods == NULL)
 577                         j=0;
 578                 else
 579                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 580                 *(p++)=1+j;
 581                 for (i=0; i<j; i++)
 582                         {
 583                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 584                         *(p++)=comp->id;
 585                         }
 586                 *(p++)=0; /* Add the NULL method */
 587
 588                 l=(p-d);
 589                 d=buf;
 590                 *(d++)=SSL3_MT_CLIENT_HELLO;
 591                 l2n3(l,d);
 592
 593                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 594                 /* number of bytes to write */
 595                 s->init_num=p-buf;
 596                 s->init_off=0;
 597                 }
 598
 599         /* SSL3_ST_CW_CLNT_HELLO_B */
 600         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 601 err:
 602         return(-1);
 603         }
 604
 605 static int ssl3_get_server_hello(SSL *s)
 606         {
 607         STACK_OF(SSL_CIPHER) *sk;
 608         SSL_CIPHER *c;
 609         unsigned char *p,*d;
 610         int i,al,ok;
 611         unsigned int j;
 612         long n;
 613         SSL_COMP *comp;
 614
 615         n=ssl3_get_message(s,
 616                 SSL3_ST_CR_SRVR_HELLO_A,
 617                 SSL3_ST_CR_SRVR_HELLO_B,
 618                 SSL3_MT_SERVER_HELLO,
 619                 300, /* ?? */
 620                 &ok);
 621
 622         if (!ok) return((int)n);
 623         d=p=(unsigned char *)s->init_msg;
 624
 625         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 626                 {
 627                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 628                 s->version=(s->version&0xff00)|p[1];
 629                 al=SSL_AD_PROTOCOL_VERSION;
 630                 goto f_err;
 631                 }
 632         p+=2;
 633
 634         /* load the server hello data */
 635         /* load the server random */
 636         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 637         p+=SSL3_RANDOM_SIZE;
 638
 639         /* get the session-id */
 640         j= *(p++);
 641
 642         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 643                 {
 644                 al=SSL_AD_ILLEGAL_PARAMETER;
 645                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 646                 goto f_err;
 647                 }
 648
 649         if (j != 0 && j == s->session->session_id_length
 650             && memcmp(p,s->session->session_id,j) == 0)
 651             {
 652             if(s->sid_ctx_length != s->session->sid_ctx_length
 653                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 654                 {
 655                 /* actually a client application bug */
 656                 al=SSL_AD_ILLEGAL_PARAMETER;
 657                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 658                 goto f_err;
 659                 }
 660             s->hit=1;
 661             }
 662         else    /* a miss or crap from the other end */
 663                 {
 664                 /* If we were trying for session-id reuse, make a new
 665                  * SSL_SESSION so we don't stuff up other people */
 666                 s->hit=0;
 667                 if (s->session->session_id_length > 0)
 668                         {
 669                         if (!ssl_get_new_session(s,0))
 670                                 {
 671                                 al=SSL_AD_INTERNAL_ERROR;
 672                                 goto f_err;
 673                                 }
 674                         }
 675                 s->session->session_id_length=j;
 676                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 677                 }
 678         p+=j;
 679         c=ssl_get_cipher_by_char(s,p);
 680         if (c == NULL)
 681                 {
 682                 /* unknown cipher */
 683                 al=SSL_AD_ILLEGAL_PARAMETER;
 684                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 685                 goto f_err;
 686                 }
 687         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 688
 689         sk=ssl_get_ciphers_by_id(s);
 690         i=sk_SSL_CIPHER_find(sk,c);
 691         if (i < 0)
 692                 {
 693                 /* we did not say we would use this cipher */
 694                 al=SSL_AD_ILLEGAL_PARAMETER;
 695                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 696                 goto f_err;
 697                 }
 698
 699         if (s->hit && (s->session->cipher_id != c->id))
 700                 {
 701                 if (!(s->options &
 702                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 703                         {
 704                         al=SSL_AD_ILLEGAL_PARAMETER;
 705                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 706                         goto f_err;
 707                         }
 708                 }
 709         s->s3->tmp.new_cipher=c;
 710
 711         /* lets get the compression algorithm */
 712         /* COMPRESSION */
 713         j= *(p++);
 714         if (j == 0)
 715                 comp=NULL;
 716         else
 717                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 718
 719         if ((j != 0) && (comp == NULL))
 720                 {
 721                 al=SSL_AD_ILLEGAL_PARAMETER;
 722                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 723                 goto f_err;
 724                 }
 725         else
 726                 {
 727                 s->s3->tmp.new_compression=comp;
 728                 }
 729
 730         if (p != (d+n))
 731                 {
 732                 /* wrong packet length */
 733                 al=SSL_AD_DECODE_ERROR;
 734                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 735                 goto err;
 736                 }
 737
 738         return(1);
 739 f_err:
 740         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 741 err:
 742         return(-1);
 743         }
 744
 745 static int ssl3_get_server_certificate(SSL *s)
 746         {
 747         int al,i,ok,ret= -1;
 748         unsigned long n,nc,llen,l;
 749         X509 *x=NULL;
 750         unsigned char *p,*d,*q;
 751         STACK_OF(X509) *sk=NULL;
 752         SESS_CERT *sc;
 753         EVP_PKEY *pkey=NULL;
 754         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 755
 756         n=ssl3_get_message(s,
 757                 SSL3_ST_CR_CERT_A,
 758                 SSL3_ST_CR_CERT_B,
 759                 -1,
 760                 s->max_cert_list,
 761                 &ok);
 762
 763         if (!ok) return((int)n);
 764
 765         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 766                 {
 767                 s->s3->tmp.reuse_message=1;
 768                 return(1);
 769                 }
 770
 771         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 772                 {
 773                 al=SSL_AD_UNEXPECTED_MESSAGE;
 774                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 775                 goto f_err;
 776                 }
 777         d=p=(unsigned char *)s->init_msg;
 778
 779         if ((sk=sk_X509_new_null()) == NULL)
 780                 {
 781                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 782                 goto err;
 783                 }
 784
 785         n2l3(p,llen);
 786         if (llen+3 != n)
 787                 {
 788                 al=SSL_AD_DECODE_ERROR;
 789                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 790                 goto f_err;
 791                 }
 792         for (nc=0; nc<llen; )
 793                 {
 794                 n2l3(p,l);
 795                 if ((l+nc+3) > llen)
 796                         {
 797                         al=SSL_AD_DECODE_ERROR;
 798                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 799                         goto f_err;
 800                         }
 801
 802                 q=p;
 803                 x=d2i_X509(NULL,&q,l);
 804                 if (x == NULL)
 805                         {
 806                         al=SSL_AD_BAD_CERTIFICATE;
 807                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 808                         goto f_err;
 809                         }
 810                 if (q != (p+l))
 811                         {
 812                         al=SSL_AD_DECODE_ERROR;
 813                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 814                         goto f_err;
 815                         }
 816                 if (!sk_X509_push(sk,x))
 817                         {
 818                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 819                         goto err;
 820                         }
 821                 x=NULL;
 822                 nc+=l+3;
 823                 p=q;
 824                 }
 825
 826         i=ssl_verify_cert_chain(s,sk);
 827         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 828 #ifndef OPENSSL_NO_KRB5
 829                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 830                 != (SSL_aKRB5|SSL_kKRB5)
 831 #endif /* OPENSSL_NO_KRB5 */
 832                 )
 833                 {
 834                 al=ssl_verify_alarm_type(s->verify_result);
 835                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 836                 goto f_err;
 837                 }
 838         ERR_clear_error(); /* but we keep s->verify_result */
 839
 840         sc=ssl_sess_cert_new();
 841         if (sc == NULL) goto err;
 842
 843         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 844         s->session->sess_cert=sc;
 845
 846         sc->cert_chain=sk;
 847         /* Inconsistency alert: cert_chain does include the peer's
 848          * certificate, which we don't include in s3_srvr.c */
 849         x=sk_X509_value(sk,0);
 850         sk=NULL;
 851         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 852
 853         pkey=X509_get_pubkey(x);
 854
 855         /* VRS: allow null cert if auth == KRB5 */
 856         need_cert =     ((s->s3->tmp.new_cipher->algorithms
 857                         & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 858                         == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 859
 860 #ifdef KSSL_DEBUG
 861         printf("pkey,x = %p, %p\n", pkey,x);
 862         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 863         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 864                 s->s3->tmp.new_cipher->algorithms, need_cert);
 865 #endif    /* KSSL_DEBUG */
 866
 867         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 868                 {
 869                 x=NULL;
 870                 al=SSL3_AL_FATAL;
 871                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 872                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 873                 goto f_err;
 874                 }
 875
 876         i=ssl_cert_type(x,pkey);
 877         if (need_cert && i < 0)
 878                 {
 879                 x=NULL;
 880                 al=SSL3_AL_FATAL;
 881                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 882                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 883                 goto f_err;
 884                 }
 885
 886         if (need_cert)
 887                 {
 888                 sc->peer_cert_type=i;
 889                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 890                 /* Why would the following ever happen?
 891                  * We just created sc a couple of lines ago. */
 892                 if (sc->peer_pkeys[i].x509 != NULL)
 893                         X509_free(sc->peer_pkeys[i].x509);
 894                 sc->peer_pkeys[i].x509=x;
 895                 sc->peer_key= &(sc->peer_pkeys[i]);
 896
 897                 if (s->session->peer != NULL)
 898                         X509_free(s->session->peer);
 899                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 900                 s->session->peer=x;
 901                 }
 902         else
 903                 {
 904                 sc->peer_cert_type=i;
 905                 sc->peer_key= NULL;
 906
 907                 if (s->session->peer != NULL)
 908                         X509_free(s->session->peer);
 909                 s->session->peer=NULL;
 910                 }
 911         s->session->verify_result = s->verify_result;
 912
 913         x=NULL;
 914         ret=1;
 915
 916         if (0)
 917                 {
 918 f_err:
 919                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 920                 }
 921 err:
 922         EVP_PKEY_free(pkey);
 923         X509_free(x);
 924         sk_X509_pop_free(sk,X509_free);
 925         return(ret);
 926         }
 927
 928 static int ssl3_get_key_exchange(SSL *s)
 929         {
 930 #ifndef OPENSSL_NO_RSA
 931         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 932 #endif
 933         EVP_MD_CTX md_ctx;
 934         unsigned char *param,*p;
 935         int al,i,j,param_len,ok;
 936         long n,alg;
 937         EVP_PKEY *pkey=NULL;
 938 #ifndef OPENSSL_NO_RSA
 939         RSA *rsa=NULL;
 940 #endif
 941 #ifndef OPENSSL_NO_DH
 942         DH *dh=NULL;
 943 #endif
 944
 945         /* use same message size as in ssl3_get_certificate_request()
 946          * as ServerKeyExchange message may be skipped */
 947         n=ssl3_get_message(s,
 948                 SSL3_ST_CR_KEY_EXCH_A,
 949                 SSL3_ST_CR_KEY_EXCH_B,
 950                 -1,
 951                 s->max_cert_list,
 952                 &ok);
 953
 954         if (!ok) return((int)n);
 955
 956         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 957                 {
 958                 s->s3->tmp.reuse_message=1;
 959                 return(1);
 960                 }
 961
 962         param=p=(unsigned char *)s->init_msg;
 963
 964         if (s->session->sess_cert != NULL)
 965                 {
 966 #ifndef OPENSSL_NO_RSA
 967                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
 968                         {
 969                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
 970                         s->session->sess_cert->peer_rsa_tmp=NULL;
 971                         }
 972 #endif
 973 #ifndef OPENSSL_NO_DH
 974                 if (s->session->sess_cert->peer_dh_tmp)
 975                         {
 976                         DH_free(s->session->sess_cert->peer_dh_tmp);
 977                         s->session->sess_cert->peer_dh_tmp=NULL;
 978                         }
 979 #endif
 980                 }
 981         else
 982                 {
 983                 s->session->sess_cert=ssl_sess_cert_new();
 984                 }
 985
 986         param_len=0;
 987         alg=s->s3->tmp.new_cipher->algorithms;
 988         EVP_MD_CTX_init(&md_ctx);
 989
 990 #ifndef OPENSSL_NO_RSA
 991         if (alg & SSL_kRSA)
 992                 {
 993                 if ((rsa=RSA_new()) == NULL)
 994                         {
 995                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 996                         goto err;
 997                         }
 998                 n2s(p,i);
 999                 param_len=i+2;
1000                 if (param_len > n)
1001                         {
1002                         al=SSL_AD_DECODE_ERROR;
1003                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1004                         goto f_err;
1005                         }
1006                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1007                         {
1008                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1009                         goto err;
1010                         }
1011                 p+=i;
1012
1013                 n2s(p,i);
1014                 param_len+=i+2;
1015                 if (param_len > n)
1016                         {
1017                         al=SSL_AD_DECODE_ERROR;
1018                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1019                         goto f_err;
1020                         }
1021                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1022                         {
1023                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1024                         goto err;
1025                         }
1026                 p+=i;
1027                 n-=param_len;
1028
1029                 /* this should be because we are using an export cipher */
1030                 if (alg & SSL_aRSA)
1031                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1032                 else
1033                         {
1034                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1035                         goto err;
1036                         }
1037                 s->session->sess_cert->peer_rsa_tmp=rsa;
1038                 rsa=NULL;
1039                 }
1040 #else /* OPENSSL_NO_RSA */
1041         if (0)
1042                 ;
1043 #endif
1044 #ifndef OPENSSL_NO_DH
1045         else if (alg & SSL_kEDH)
1046                 {
1047                 if ((dh=DH_new()) == NULL)
1048                         {
1049                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1050                         goto err;
1051                         }
1052                 n2s(p,i);
1053                 param_len=i+2;
1054                 if (param_len > n)
1055                         {
1056                         al=SSL_AD_DECODE_ERROR;
1057                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1058                         goto f_err;
1059                         }
1060                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1061                         {
1062                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1063                         goto err;
1064                         }
1065                 p+=i;
1066
1067                 n2s(p,i);
1068                 param_len+=i+2;
1069                 if (param_len > n)
1070                         {
1071                         al=SSL_AD_DECODE_ERROR;
1072                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1073                         goto f_err;
1074                         }
1075                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1076                         {
1077                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1078                         goto err;
1079                         }
1080                 p+=i;
1081
1082                 n2s(p,i);
1083                 param_len+=i+2;
1084                 if (param_len > n)
1085                         {
1086                         al=SSL_AD_DECODE_ERROR;
1087                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1088                         goto f_err;
1089                         }
1090                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1091                         {
1092                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1093                         goto err;
1094                         }
1095                 p+=i;
1096                 n-=param_len;
1097
1098 #ifndef OPENSSL_NO_RSA
1099                 if (alg & SSL_aRSA)
1100                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1101 #else
1102                 if (0)
1103                         ;
1104 #endif
1105 #ifndef OPENSSL_NO_DSA
1106                 else if (alg & SSL_aDSS)
1107                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1108 #endif
1109                 /* else anonymous DH, so no certificate or pkey. */
1110
1111                 s->session->sess_cert->peer_dh_tmp=dh;
1112                 dh=NULL;
1113                 }
1114         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1115                 {
1116                 al=SSL_AD_ILLEGAL_PARAMETER;
1117                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1118                 goto f_err;
1119                 }
1120 #endif /* !OPENSSL_NO_DH */
1121         if (alg & SSL_aFZA)
1122                 {
1123                 al=SSL_AD_HANDSHAKE_FAILURE;
1124                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1125                 goto f_err;
1126                 }
1127
1128
1129         /* p points to the next byte, there are 'n' bytes left */
1130
1131
1132         /* if it was signed, check the signature */
1133         if (pkey != NULL)
1134                 {
1135                 n2s(p,i);
1136                 n-=2;
1137                 j=EVP_PKEY_size(pkey);
1138
1139                 if ((i != n) || (n > j) || (n <= 0))
1140                         {
1141                         /* wrong packet length */
1142                         al=SSL_AD_DECODE_ERROR;
1143                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1144                         goto f_err;
1145                         }
1146
1147 #ifndef OPENSSL_NO_RSA
1148                 if (pkey->type == EVP_PKEY_RSA)
1149                         {
1150                         int num;
1151
1152                         j=0;
1153                         q=md_buf;
1154                         for (num=2; num > 0; num--)
1155                                 {
1156                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1157                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1158                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1159                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1160                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1161                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1162                                 q+=i;
1163                                 j+=i;
1164                                 }
1165                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1166                                                                 pkey->pkey.rsa);
1167                         if (i < 0)
1168                                 {
1169                                 al=SSL_AD_DECRYPT_ERROR;
1170                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1171                                 goto f_err;
1172                                 }
1173                         if (i == 0)
1174                                 {
1175                                 /* bad signature */
1176                                 al=SSL_AD_DECRYPT_ERROR;
1177                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1178                                 goto f_err;
1179                                 }
1180                         }
1181                 else
1182 #endif
1183 #ifndef OPENSSL_NO_DSA
1184                         if (pkey->type == EVP_PKEY_DSA)
1185                         {
1186                         /* lets do DSS */
1187                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1188                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1189                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1190                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1191                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1192                                 {
1193                                 /* bad signature */
1194                                 al=SSL_AD_DECRYPT_ERROR;
1195                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1196                                 goto f_err;
1197                                 }
1198                         }
1199                 else
1200 #endif
1201                         {
1202                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1203                         goto err;
1204                         }
1205                 }
1206         else
1207                 {
1208                 /* still data left over */
1209                 if (!(alg & SSL_aNULL))
1210                         {
1211                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1212                         goto err;
1213                         }
1214                 if (n != 0)
1215                         {
1216                         al=SSL_AD_DECODE_ERROR;
1217                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1218                         goto f_err;
1219                         }
1220                 }
1221         EVP_PKEY_free(pkey);
1222         EVP_MD_CTX_cleanup(&md_ctx);
1223         return(1);
1224 f_err:
1225         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1226 err:
1227         EVP_PKEY_free(pkey);
1228 #ifndef OPENSSL_NO_RSA
1229         if (rsa != NULL)
1230                 RSA_free(rsa);
1231 #endif
1232 #ifndef OPENSSL_NO_DH
1233         if (dh != NULL)
1234                 DH_free(dh);
1235 #endif
1236         EVP_MD_CTX_cleanup(&md_ctx);
1237         return(-1);
1238         }
1239
1240 static int ssl3_get_certificate_request(SSL *s)
1241         {
1242         int ok,ret=0;
1243         unsigned long n,nc,l;
1244         unsigned int llen,ctype_num,i;
1245         X509_NAME *xn=NULL;
1246         unsigned char *p,*d,*q;
1247         STACK_OF(X509_NAME) *ca_sk=NULL;
1248
1249         n=ssl3_get_message(s,
1250                 SSL3_ST_CR_CERT_REQ_A,
1251                 SSL3_ST_CR_CERT_REQ_B,
1252                 -1,
1253                 s->max_cert_list,
1254                 &ok);
1255
1256         if (!ok) return((int)n);
1257
1258         s->s3->tmp.cert_req=0;
1259
1260         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1261                 {
1262                 s->s3->tmp.reuse_message=1;
1263                 return(1);
1264                 }
1265
1266         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1267                 {
1268                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1269                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1270                 goto err;
1271                 }
1272
1273         /* TLS does not like anon-DH with client cert */
1274         if (s->version > SSL3_VERSION)
1275                 {
1276                 l=s->s3->tmp.new_cipher->algorithms;
1277                 if (l & SSL_aNULL)
1278                         {
1279                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1280                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1281                         goto err;
1282                         }
1283                 }
1284
1285         d=p=(unsigned char *)s->init_msg;
1286
1287         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1288                 {
1289                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1290                 goto err;
1291                 }
1292
1293         /* get the certificate types */
1294         ctype_num= *(p++);
1295         if (ctype_num > SSL3_CT_NUMBER)
1296                 ctype_num=SSL3_CT_NUMBER;
1297         for (i=0; i<ctype_num; i++)
1298                 s->s3->tmp.ctype[i]= p[i];
1299         p+=ctype_num;
1300
1301         /* get the CA RDNs */
1302         n2s(p,llen);
1303 #if 0
1304 {
1305 FILE *out;
1306 out=fopen("/tmp/vsign.der","w");
1307 fwrite(p,1,llen,out);
1308 fclose(out);
1309 }
1310 #endif
1311
1312         if ((llen+ctype_num+2+1) != n)
1313                 {
1314                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1315                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1316                 goto err;
1317                 }
1318
1319         for (nc=0; nc<llen; )
1320                 {
1321                 n2s(p,l);
1322                 if ((l+nc+2) > llen)
1323                         {
1324                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1325                                 goto cont; /* netscape bugs */
1326                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1327                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1328                         goto err;
1329                         }
1330
1331                 q=p;
1332
1333                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1334                         {
1335                         /* If netscape tolerance is on, ignore errors */
1336                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1337                                 goto cont;
1338                         else
1339                                 {
1340                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1341                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1342                                 goto err;
1343                                 }
1344                         }
1345
1346                 if (q != (p+l))
1347                         {
1348                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1349                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1350                         goto err;
1351                         }
1352                 if (!sk_X509_NAME_push(ca_sk,xn))
1353                         {
1354                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1355                         goto err;
1356                         }
1357
1358                 p+=l;
1359                 nc+=l+2;
1360                 }
1361
1362         if (0)
1363                 {
1364 cont:
1365                 ERR_clear_error();
1366                 }
1367
1368         /* we should setup a certificate to return.... */
1369         s->s3->tmp.cert_req=1;
1370         s->s3->tmp.ctype_num=ctype_num;
1371         if (s->s3->tmp.ca_names != NULL)
1372                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1373         s->s3->tmp.ca_names=ca_sk;
1374         ca_sk=NULL;
1375
1376         ret=1;
1377 err:
1378         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1379         return(ret);
1380         }
1381
1382 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1383         {
1384         return(X509_NAME_cmp(*a,*b));
1385         }
1386
1387 static int ssl3_get_server_done(SSL *s)
1388         {
1389         int ok,ret=0;
1390         long n;
1391
1392         n=ssl3_get_message(s,
1393                 SSL3_ST_CR_SRVR_DONE_A,
1394                 SSL3_ST_CR_SRVR_DONE_B,
1395                 SSL3_MT_SERVER_DONE,
1396                 30, /* should be very small, like 0 :-) */
1397                 &ok);
1398
1399         if (!ok) return((int)n);
1400         if (n > 0)
1401                 {
1402                 /* should contain no data */
1403                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1404                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1405                 return -1;
1406                 }
1407         ret=1;
1408         return(ret);
1409         }
1410
1411 static int ssl3_send_client_key_exchange(SSL *s)
1412         {
1413         unsigned char *p,*d;
1414         int n;
1415         unsigned long l;
1416 #ifndef OPENSSL_NO_RSA
1417         unsigned char *q;
1418         EVP_PKEY *pkey=NULL;
1419 #endif
1420 #ifndef OPENSSL_NO_KRB5
1421         KSSL_ERR kssl_err;
1422 #endif /* OPENSSL_NO_KRB5 */
1423
1424         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1425                 {
1426                 d=(unsigned char *)s->init_buf->data;
1427                 p= &(d[4]);
1428
1429                 l=s->s3->tmp.new_cipher->algorithms;
1430
1431                 /* Fool emacs indentation */
1432                 if (0) {}
1433 #ifndef OPENSSL_NO_RSA
1434                 else if (l & SSL_kRSA)
1435                         {
1436                         RSA *rsa;
1437                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1438
1439                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1440                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1441                         else
1442                                 {
1443                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1444                                 if ((pkey == NULL) ||
1445                                         (pkey->type != EVP_PKEY_RSA) ||
1446                                         (pkey->pkey.rsa == NULL))
1447                                         {
1448                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1449                                         goto err;
1450                                         }
1451                                 rsa=pkey->pkey.rsa;
1452                                 EVP_PKEY_free(pkey);
1453                                 }
1454
1455                         tmp_buf[0]=s->client_version>>8;
1456                         tmp_buf[1]=s->client_version&0xff;
1457                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1458                                         goto err;
1459
1460                         s->session->master_key_length=sizeof tmp_buf;
1461
1462                         q=p;
1463                         /* Fix buf for TLS and beyond */
1464                         if (s->version > SSL3_VERSION)
1465                                 p+=2;
1466                         n=RSA_public_encrypt(sizeof tmp_buf,
1467                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1468 #ifdef PKCS1_CHECK
1469                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1470                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1471 #endif
1472                         if (n <= 0)
1473                                 {
1474                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1475                                 goto err;
1476                                 }
1477
1478                         /* Fix buf for TLS and beyond */
1479                         if (s->version > SSL3_VERSION)
1480                                 {
1481                                 s2n(n,q);
1482                                 n+=2;
1483                                 }
1484
1485                         s->session->master_key_length=
1486                                 s->method->ssl3_enc->generate_master_secret(s,
1487                                         s->session->master_key,
1488                                         tmp_buf,sizeof tmp_buf);
1489                         memset(tmp_buf,0,sizeof tmp_buf);
1490                         }
1491 #endif
1492 #ifndef OPENSSL_NO_KRB5
1493                 else if (l & SSL_kKRB5)
1494                         {
1495                         krb5_error_code krb5rc;
1496                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1497                         /*  krb5_data   krb5_ap_req;  */
1498                         krb5_data       *enc_ticket;
1499                         krb5_data       authenticator, *authp = NULL;
1500                         EVP_CIPHER_CTX  ciph_ctx;
1501                         EVP_CIPHER      *enc = NULL;
1502                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1503                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1504                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1505                                                 + EVP_MAX_IV_LENGTH];
1506                         int             padl, outl = sizeof(epms);
1507
1508                         EVP_CIPHER_CTX_init(&ciph_ctx);
1509
1510 #ifdef KSSL_DEBUG
1511                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1512                                 l, SSL_kKRB5);
1513 #endif  /* KSSL_DEBUG */
1514
1515                         authp = NULL;
1516 #ifdef KRB5SENDAUTH
1517                         if (KRB5SENDAUTH)  authp = &authenticator;
1518 #endif  /* KRB5SENDAUTH */
1519
1520                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1521                                 &kssl_err);
1522                         enc = kssl_map_enc(kssl_ctx->enctype);
1523                         if (enc == NULL)
1524                             goto err;
1525 #ifdef KSSL_DEBUG
1526                         {
1527                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1528                         if (krb5rc && kssl_err.text)
1529                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1530                         }
1531 #endif  /* KSSL_DEBUG */
1532
1533                         if (krb5rc)
1534                                 {
1535                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1536                                                 SSL_AD_HANDSHAKE_FAILURE);
1537                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1538                                                 kssl_err.reason);
1539                                 goto err;
1540                                 }
1541
1542                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1543                         **  in place of RFC 2712 KerberosWrapper, as in:
1544                         **
1545                         **  Send ticket (copy to *p, set n = length)
1546                         **  n = krb5_ap_req.length;
1547                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1548                         **  if (krb5_ap_req.data)
1549                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1550                         **
1551                         **  Now using real RFC 2712 KerberosWrapper
1552                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1553                         **  Note: 2712 "opaque" types are here replaced
1554                         **  with a 2-byte length followed by the value.
1555                         **  Example:
1556                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1557                         **  Where "xx xx" = length bytes.  Shown here with
1558                         **  optional authenticator omitted.
1559                         */
1560
1561                         /*  KerberosWrapper.Ticket              */
1562                         s2n(enc_ticket->length,p);
1563                         memcpy(p, enc_ticket->data, enc_ticket->length);
1564                         p+= enc_ticket->length;
1565                         n = enc_ticket->length + 2;
1566
1567                         /*  KerberosWrapper.Authenticator       */
1568                         if (authp  &&  authp->length)
1569                                 {
1570                                 s2n(authp->length,p);
1571                                 memcpy(p, authp->data, authp->length);
1572                                 p+= authp->length;
1573                                 n+= authp->length + 2;
1574
1575                                 free(authp->data);
1576                                 authp->data = NULL;
1577                                 authp->length = 0;
1578                                 }
1579                         else
1580                                 {
1581                                 s2n(0,p);/*  null authenticator length  */
1582                                 n+=2;
1583                                 }
1584
1585                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1586                             goto err;
1587
1588                         /*  20010420 VRS.  Tried it this way; failed.
1589                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1590                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1591                         **                              kssl_ctx->length);
1592                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1593                         */
1594
1595                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1596                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1597                                 kssl_ctx->key,iv);
1598                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1599                                 sizeof tmp_buf);
1600                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1601                         outl += padl;
1602                         if (outl > sizeof epms)
1603                                 {
1604                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1605                                 goto err;
1606                                 }
1607                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1608
1609                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1610                         s2n(outl,p);
1611                         memcpy(p, epms, outl);
1612                         p+=outl;
1613                         n+=outl + 2;
1614
1615                         s->session->master_key_length=
1616                                 s->method->ssl3_enc->generate_master_secret(s,
1617                                         s->session->master_key,
1618                                         tmp_buf, sizeof tmp_buf);
1619
1620                         memset(tmp_buf, 0, sizeof tmp_buf);
1621                         memset(epms, 0, outl);
1622                         }
1623 #endif
1624 #ifndef OPENSSL_NO_DH
1625                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1626                         {
1627                         DH *dh_srvr,*dh_clnt;
1628
1629                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1630                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1631                         else
1632                                 {
1633                                 /* we get them from the cert */
1634                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1635                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1636                                 goto err;
1637                                 }
1638
1639                         /* generate a new random key */
1640                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1641                                 {
1642                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1643                                 goto err;
1644                                 }
1645                         if (!DH_generate_key(dh_clnt))
1646                                 {
1647                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1648                                 goto err;
1649                                 }
1650
1651                         /* use the 'p' output buffer for the DH key, but
1652                          * make sure to clear it out afterwards */
1653
1654                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1655
1656                         if (n <= 0)
1657                                 {
1658                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1659                                 goto err;
1660                                 }
1661
1662                         /* generate master key from the result */
1663                         s->session->master_key_length=
1664                                 s->method->ssl3_enc->generate_master_secret(s,
1665                                         s->session->master_key,p,n);
1666                         /* clean up */
1667                         memset(p,0,n);
1668
1669                         /* send off the data */
1670                         n=BN_num_bytes(dh_clnt->pub_key);
1671                         s2n(n,p);
1672                         BN_bn2bin(dh_clnt->pub_key,p);
1673                         n+=2;
1674
1675                         DH_free(dh_clnt);
1676
1677                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1678                         }
1679 #endif
1680                 else
1681                         {
1682                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1683                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1684                         goto err;
1685                         }
1686
1687                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1688                 l2n3(n,d);
1689
1690                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1691                 /* number of bytes to write */
1692                 s->init_num=n+4;
1693                 s->init_off=0;
1694                 }
1695
1696         /* SSL3_ST_CW_KEY_EXCH_B */
1697         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1698 err:
1699         return(-1);
1700         }
1701
1702 static int ssl3_send_client_verify(SSL *s)
1703         {
1704         unsigned char *p,*d;
1705         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1706         EVP_PKEY *pkey;
1707 #ifndef OPENSSL_NO_RSA
1708         unsigned u=0;
1709 #endif
1710         unsigned long n;
1711 #ifndef OPENSSL_NO_DSA
1712         int j;
1713 #endif
1714
1715         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1716                 {
1717                 d=(unsigned char *)s->init_buf->data;
1718                 p= &(d[4]);
1719                 pkey=s->cert->key->privatekey;
1720
1721                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1722                         &(data[MD5_DIGEST_LENGTH]));
1723
1724 #ifndef OPENSSL_NO_RSA
1725                 if (pkey->type == EVP_PKEY_RSA)
1726                         {
1727                         s->method->ssl3_enc->cert_verify_mac(s,
1728                                 &(s->s3->finish_dgst1),&(data[0]));
1729                         if (RSA_sign(NID_md5_sha1, data,
1730                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1731                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1732                                 {
1733                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1734                                 goto err;
1735                                 }
1736                         s2n(u,p);
1737                         n=u+2;
1738                         }
1739                 else
1740 #endif
1741 #ifndef OPENSSL_NO_DSA
1742                         if (pkey->type == EVP_PKEY_DSA)
1743                         {
1744                         if (!DSA_sign(pkey->save_type,
1745                                 &(data[MD5_DIGEST_LENGTH]),
1746                                 SHA_DIGEST_LENGTH,&(p[2]),
1747                                 (unsigned int *)&j,pkey->pkey.dsa))
1748                                 {
1749                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1750                                 goto err;
1751                                 }
1752                         s2n(j,p);
1753                         n=j+2;
1754                         }
1755                 else
1756 #endif
1757                         {
1758                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1759                         goto err;
1760                         }
1761                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1762                 l2n3(n,d);
1763
1764                 s->init_num=(int)n+4;
1765                 s->init_off=0;
1766                 }
1767         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1768 err:
1769         return(-1);
1770         }
1771
1772 static int ssl3_send_client_certificate(SSL *s)
1773         {
1774         X509 *x509=NULL;
1775         EVP_PKEY *pkey=NULL;
1776         int i;
1777         unsigned long l;
1778
1779         if (s->state == SSL3_ST_CW_CERT_A)
1780                 {
1781                 if ((s->cert == NULL) ||
1782                         (s->cert->key->x509 == NULL) ||
1783                         (s->cert->key->privatekey == NULL))
1784                         s->state=SSL3_ST_CW_CERT_B;
1785                 else
1786                         s->state=SSL3_ST_CW_CERT_C;
1787                 }
1788
1789         /* We need to get a client cert */
1790         if (s->state == SSL3_ST_CW_CERT_B)
1791                 {
1792                 /* If we get an error, we need to
1793                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1794                  * We then get retied later */
1795                 i=0;
1796                 if (s->ctx->client_cert_cb != NULL)
1797                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1798                 if (i < 0)
1799                         {
1800                         s->rwstate=SSL_X509_LOOKUP;
1801                         return(-1);
1802                         }
1803                 s->rwstate=SSL_NOTHING;
1804                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1805                         {
1806                         s->state=SSL3_ST_CW_CERT_B;
1807                         if (    !SSL_use_certificate(s,x509) ||
1808                                 !SSL_use_PrivateKey(s,pkey))
1809                                 i=0;
1810                         }
1811                 else if (i == 1)
1812                         {
1813                         i=0;
1814                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1815                         }
1816
1817                 if (x509 != NULL) X509_free(x509);
1818                 if (pkey != NULL) EVP_PKEY_free(pkey);
1819                 if (i == 0)
1820                         {
1821                         if (s->version == SSL3_VERSION)
1822                                 {
1823                                 s->s3->tmp.cert_req=0;
1824                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1825                                 return(1);
1826                                 }
1827                         else
1828                                 {
1829                                 s->s3->tmp.cert_req=2;
1830                                 }
1831                         }
1832
1833                 /* Ok, we have a cert */
1834                 s->state=SSL3_ST_CW_CERT_C;
1835                 }
1836
1837         if (s->state == SSL3_ST_CW_CERT_C)
1838                 {
1839                 s->state=SSL3_ST_CW_CERT_D;
1840                 l=ssl3_output_cert_chain(s,
1841                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1842                 s->init_num=(int)l;
1843                 s->init_off=0;
1844                 }
1845         /* SSL3_ST_CW_CERT_D */
1846         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1847         }
1848
1849 #define has_bits(i,m)   (((i)&(m)) == (m))
1850
1851 static int ssl3_check_cert_and_algorithm(SSL *s)
1852         {
1853         int i,idx;
1854         long algs;
1855         EVP_PKEY *pkey=NULL;
1856         SESS_CERT *sc;
1857 #ifndef OPENSSL_NO_RSA
1858         RSA *rsa;
1859 #endif
1860 #ifndef OPENSSL_NO_DH
1861         DH *dh;
1862 #endif
1863
1864         sc=s->session->sess_cert;
1865
1866         if (sc == NULL)
1867                 {
1868                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
1869                 goto err;
1870                 }
1871
1872         algs=s->s3->tmp.new_cipher->algorithms;
1873
1874         /* we don't have a certificate */
1875         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
1876                 return(1);
1877
1878 #ifndef OPENSSL_NO_RSA
1879         rsa=s->session->sess_cert->peer_rsa_tmp;
1880 #endif
1881 #ifndef OPENSSL_NO_DH
1882         dh=s->session->sess_cert->peer_dh_tmp;
1883 #endif
1884
1885         /* This is the passed certificate */
1886
1887         idx=sc->peer_cert_type;
1888         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1889         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1890         EVP_PKEY_free(pkey);
1891
1892
1893         /* Check that we have a certificate if we require one */
1894         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1895                 {
1896                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1897                 goto f_err;
1898                 }
1899 #ifndef OPENSSL_NO_DSA
1900         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1901                 {
1902                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1903                 goto f_err;
1904                 }
1905 #endif
1906 #ifndef OPENSSL_NO_RSA
1907         if ((algs & SSL_kRSA) &&
1908                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1909                 {
1910                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1911                 goto f_err;
1912                 }
1913 #endif
1914 #ifndef OPENSSL_NO_DH
1915         if ((algs & SSL_kEDH) &&
1916                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1917                 {
1918                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1919                 goto f_err;
1920                 }
1921         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1922                 {
1923                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1924                 goto f_err;
1925                 }
1926 #ifndef OPENSSL_NO_DSA
1927         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1928                 {
1929                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1930                 goto f_err;
1931                 }
1932 #endif
1933 #endif
1934
1935         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
1936                 {
1937 #ifndef OPENSSL_NO_RSA
1938                 if (algs & SSL_kRSA)
1939                         {
1940                         if (rsa == NULL
1941                             || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1942                                 {
1943                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1944                                 goto f_err;
1945                                 }
1946                         }
1947                 else
1948 #endif
1949 #ifndef OPENSSL_NO_DH
1950                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1951                             {
1952                             if (dh == NULL
1953                                 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1954                                 {
1955                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1956                                 goto f_err;
1957                                 }
1958                         }
1959                 else
1960 #endif
1961                         {
1962                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1963                         goto f_err;
1964                         }
1965                 }
1966         return(1);
1967 f_err:
1968         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1969 err:
1970         return(0);
1971         }
1972