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 #include <stdio.h>
  60 #include <openssl/buffer.h>
  61 #include <openssl/rand.h>
  62 #include <openssl/objects.h>
  63 #include <openssl/evp.h>
  64 #include "ssl_locl.h"
  65
  66 #ifndef OPENSSL_NO_KRB5
  67 #include "kssl_lcl.h"
  68 #endif
  69
  70 static SSL_METHOD *ssl3_get_client_method(int ver);
  71 static int ssl3_client_hello(SSL *s);
  72 static int ssl3_get_server_hello(SSL *s);
  73 static int ssl3_get_certificate_request(SSL *s);
  74 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
  75 static int ssl3_get_server_done(SSL *s);
  76 static int ssl3_send_client_verify(SSL *s);
  77 static int ssl3_send_client_certificate(SSL *s);
  78 static int ssl3_send_client_key_exchange(SSL *s);
  79 static int ssl3_get_key_exchange(SSL *s);
  80 static int ssl3_get_server_certificate(SSL *s);
  81 static int ssl3_check_cert_and_algorithm(SSL *s);
  82 static SSL_METHOD *ssl3_get_client_method(int ver)
  83         {
  84         if (ver == SSL3_VERSION)
  85                 return(SSLv3_client_method());
  86         else
  87                 return(NULL);
  88         }
  89
  90 SSL_METHOD *SSLv3_client_method(void)
  91         {
  92         static int init=1;
  93         static SSL_METHOD SSLv3_client_data;
  94
  95         if (init)
  96                 {
  97                 init=0;
  98                 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
  99                         sizeof(SSL_METHOD));
 100                 SSLv3_client_data.ssl_connect=ssl3_connect;
 101                 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
 102                 }
 103         return(&SSLv3_client_data);
 104         }
 105
 106 int ssl3_connect(SSL *s)
 107         {
 108         BUF_MEM *buf;
 109         unsigned long Time=time(NULL),l;
 110         long num1;
 111         void (*cb)()=NULL;
 112         int ret= -1;
 113         int new_state,state,skip=0;;
 114
 115         RAND_add(&Time,sizeof(Time),0);
 116         ERR_clear_error();
 117         clear_sys_error();
 118
 119         if (s->info_callback != NULL)
 120                 cb=s->info_callback;
 121         else if (s->ctx->info_callback != NULL)
 122                 cb=s->ctx->info_callback;
 123
 124         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 125         s->in_handshake++;
 126
 127         for (;;)
 128                 {
 129                 state=s->state;
 130
 131                 switch(s->state)
 132                         {
 133                 case SSL_ST_RENEGOTIATE:
 134                         s->new_session=1;
 135                         s->state=SSL_ST_CONNECT;
 136                         s->ctx->stats.sess_connect_renegotiate++;
 137                         /* break */
 138                 case SSL_ST_BEFORE:
 139                 case SSL_ST_CONNECT:
 140                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 141                 case SSL_ST_OK|SSL_ST_CONNECT:
 142
 143                         s->server=0;
 144                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 145
 146                         if ((s->version & 0xff00 ) != 0x0300)
 147                                 {
 148                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 149                                 ret = -1;
 150                                 goto end;
 151                                 }
 152
 153                         /* s->version=SSL3_VERSION; */
 154                         s->type=SSL_ST_CONNECT;
 155
 156                         if (s->init_buf == NULL)
 157                                 {
 158                                 if ((buf=BUF_MEM_new()) == NULL)
 159                                         {
 160                                         ret= -1;
 161                                         goto end;
 162                                         }
 163                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 164                                         {
 165                                         ret= -1;
 166                                         goto end;
 167                                         }
 168                                 s->init_buf=buf;
 169                                 }
 170
 171                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 172
 173                         /* setup buffing BIO */
 174                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 175
 176                         /* don't push the buffering BIO quite yet */
 177
 178                         ssl3_init_finished_mac(s);
 179
 180                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 181                         s->ctx->stats.sess_connect++;
 182                         s->init_num=0;
 183                         break;
 184
 185                 case SSL3_ST_CW_CLNT_HELLO_A:
 186                 case SSL3_ST_CW_CLNT_HELLO_B:
 187
 188                         s->shutdown=0;
 189                         ret=ssl3_client_hello(s);
 190                         if (ret <= 0) goto end;
 191                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 192                         s->init_num=0;
 193
 194                         /* turn on buffering for the next lot of output */
 195                         if (s->bbio != s->wbio)
 196                                 s->wbio=BIO_push(s->bbio,s->wbio);
 197
 198                         break;
 199
 200                 case SSL3_ST_CR_SRVR_HELLO_A:
 201                 case SSL3_ST_CR_SRVR_HELLO_B:
 202                         ret=ssl3_get_server_hello(s);
 203                         if (ret <= 0) goto end;
 204                         if (s->hit)
 205                                 s->state=SSL3_ST_CR_FINISHED_A;
 206                         else
 207                                 s->state=SSL3_ST_CR_CERT_A;
 208                         s->init_num=0;
 209                         break;
 210
 211                 case SSL3_ST_CR_CERT_A:
 212                 case SSL3_ST_CR_CERT_B:
 213                         /* Check if it is anon DH */
 214                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 215                                 {
 216                                 ret=ssl3_get_server_certificate(s);
 217                                 if (ret <= 0) goto end;
 218                                 }
 219                         else
 220                                 skip=1;
 221                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 222                         s->init_num=0;
 223                         break;
 224
 225                 case SSL3_ST_CR_KEY_EXCH_A:
 226                 case SSL3_ST_CR_KEY_EXCH_B:
 227                         ret=ssl3_get_key_exchange(s);
 228                         if (ret <= 0) goto end;
 229                         s->state=SSL3_ST_CR_CERT_REQ_A;
 230                         s->init_num=0;
 231
 232                         /* at this point we check that we have the
 233                          * required stuff from the server */
 234                         if (!ssl3_check_cert_and_algorithm(s))
 235                                 {
 236                                 ret= -1;
 237                                 goto end;
 238                                 }
 239                         break;
 240
 241                 case SSL3_ST_CR_CERT_REQ_A:
 242                 case SSL3_ST_CR_CERT_REQ_B:
 243                         ret=ssl3_get_certificate_request(s);
 244                         if (ret <= 0) goto end;
 245                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 246                         s->init_num=0;
 247                         break;
 248
 249                 case SSL3_ST_CR_SRVR_DONE_A:
 250                 case SSL3_ST_CR_SRVR_DONE_B:
 251                         ret=ssl3_get_server_done(s);
 252                         if (ret <= 0) goto end;
 253                         if (s->s3->tmp.cert_req)
 254                                 s->state=SSL3_ST_CW_CERT_A;
 255                         else
 256                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 257                         s->init_num=0;
 258
 259                         break;
 260
 261                 case SSL3_ST_CW_CERT_A:
 262                 case SSL3_ST_CW_CERT_B:
 263                 case SSL3_ST_CW_CERT_C:
 264                 case SSL3_ST_CW_CERT_D:
 265                         ret=ssl3_send_client_certificate(s);
 266                         if (ret <= 0) goto end;
 267                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 268                         s->init_num=0;
 269                         break;
 270
 271                 case SSL3_ST_CW_KEY_EXCH_A:
 272                 case SSL3_ST_CW_KEY_EXCH_B:
 273                         ret=ssl3_send_client_key_exchange(s);
 274                         if (ret <= 0) goto end;
 275                         l=s->s3->tmp.new_cipher->algorithms;
 276                         /* EAY EAY EAY need to check for DH fix cert
 277                          * sent back */
 278                         /* For TLS, cert_req is set to 2, so a cert chain
 279                          * of nothing is sent, but no verify packet is sent */
 280                         if (s->s3->tmp.cert_req == 1)
 281                                 {
 282                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 283                                 }
 284                         else
 285                                 {
 286                                 s->state=SSL3_ST_CW_CHANGE_A;
 287                                 s->s3->change_cipher_spec=0;
 288                                 }
 289
 290                         s->init_num=0;
 291                         break;
 292
 293                 case SSL3_ST_CW_CERT_VRFY_A:
 294                 case SSL3_ST_CW_CERT_VRFY_B:
 295                         ret=ssl3_send_client_verify(s);
 296                         if (ret <= 0) goto end;
 297                         s->state=SSL3_ST_CW_CHANGE_A;
 298                         s->init_num=0;
 299                         s->s3->change_cipher_spec=0;
 300                         break;
 301
 302                 case SSL3_ST_CW_CHANGE_A:
 303                 case SSL3_ST_CW_CHANGE_B:
 304                         ret=ssl3_send_change_cipher_spec(s,
 305                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 306                         if (ret <= 0) goto end;
 307                         s->state=SSL3_ST_CW_FINISHED_A;
 308                         s->init_num=0;
 309
 310                         s->session->cipher=s->s3->tmp.new_cipher;
 311                         if (s->s3->tmp.new_compression == NULL)
 312                                 s->session->compress_meth=0;
 313                         else
 314                                 s->session->compress_meth=
 315                                         s->s3->tmp.new_compression->id;
 316                         if (!s->method->ssl3_enc->setup_key_block(s))
 317                                 {
 318                                 ret= -1;
 319                                 goto end;
 320                                 }
 321
 322                         if (!s->method->ssl3_enc->change_cipher_state(s,
 323                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 324                                 {
 325                                 ret= -1;
 326                                 goto end;
 327                                 }
 328
 329                         break;
 330
 331                 case SSL3_ST_CW_FINISHED_A:
 332                 case SSL3_ST_CW_FINISHED_B:
 333                         ret=ssl3_send_finished(s,
 334                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 335                                 s->method->ssl3_enc->client_finished_label,
 336                                 s->method->ssl3_enc->client_finished_label_len);
 337                         if (ret <= 0) goto end;
 338                         s->state=SSL3_ST_CW_FLUSH;
 339
 340                         /* clear flags */
 341                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 342                         if (s->hit)
 343                                 {
 344                                 s->s3->tmp.next_state=SSL_ST_OK;
 345                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 346                                         {
 347                                         s->state=SSL_ST_OK;
 348                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 349                                         s->s3->delay_buf_pop_ret=0;
 350                                         }
 351                                 }
 352                         else
 353                                 {
 354                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 355                                 }
 356                         s->init_num=0;
 357                         break;
 358
 359                 case SSL3_ST_CR_FINISHED_A:
 360                 case SSL3_ST_CR_FINISHED_B:
 361
 362                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 363                                 SSL3_ST_CR_FINISHED_B);
 364                         if (ret <= 0) goto end;
 365
 366                         if (s->hit)
 367                                 s->state=SSL3_ST_CW_CHANGE_A;
 368                         else
 369                                 s->state=SSL_ST_OK;
 370                         s->init_num=0;
 371                         break;
 372
 373                 case SSL3_ST_CW_FLUSH:
 374                         /* number of bytes to be flushed */
 375                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 376                         if (num1 > 0)
 377                                 {
 378                                 s->rwstate=SSL_WRITING;
 379                                 num1=BIO_flush(s->wbio);
 380                                 if (num1 <= 0) { ret= -1; goto end; }
 381                                 s->rwstate=SSL_NOTHING;
 382                                 }
 383
 384                         s->state=s->s3->tmp.next_state;
 385                         break;
 386
 387                 case SSL_ST_OK:
 388                         /* clean a few things up */
 389                         ssl3_cleanup_key_block(s);
 390
 391                         if (s->init_buf != NULL)
 392                                 {
 393                                 BUF_MEM_free(s->init_buf);
 394                                 s->init_buf=NULL;
 395                                 }
 396
 397                         /* If we are not 'joining' the last two packets,
 398                          * remove the buffering now */
 399                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 400                                 ssl_free_wbio_buffer(s);
 401                         /* else do it later in ssl3_write */
 402
 403                         s->init_num=0;
 404                         s->new_session=0;
 405
 406                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 407                         if (s->hit) s->ctx->stats.sess_hit++;
 408
 409                         ret=1;
 410                         /* s->server=0; */
 411                         s->handshake_func=ssl3_connect;
 412                         s->ctx->stats.sess_connect_good++;
 413
 414                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 415
 416                         goto end;
 417                         /* break; */
 418
 419                 default:
 420                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 421                         ret= -1;
 422                         goto end;
 423                         /* break; */
 424                         }
 425
 426                 /* did we do anything */
 427                 if (!s->s3->tmp.reuse_message && !skip)
 428                         {
 429                         if (s->debug)
 430                                 {
 431                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 432                                         goto end;
 433                                 }
 434
 435                         if ((cb != NULL) && (s->state != state))
 436                                 {
 437                                 new_state=s->state;
 438                                 s->state=state;
 439                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 440                                 s->state=new_state;
 441                                 }
 442                         }
 443                 skip=0;
 444                 }
 445 end:
 446         if (cb != NULL)
 447                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 448         s->in_handshake--;
 449         return(ret);
 450         }
 451
 452
 453 static int ssl3_client_hello(SSL *s)
 454         {
 455         unsigned char *buf;
 456         unsigned char *p,*d;
 457         int i,j;
 458         unsigned long Time,l;
 459         SSL_COMP *comp;
 460
 461         buf=(unsigned char *)s->init_buf->data;
 462         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 463                 {
 464                 if ((s->session == NULL) ||
 465                         (s->session->ssl_version != s->version) ||
 466                         (s->session->not_resumable))
 467                         {
 468                         if (!ssl_get_new_session(s,0))
 469                                 goto err;
 470                         }
 471                 /* else use the pre-loaded session */
 472
 473                 p=s->s3->client_random;
 474                 Time=time(NULL);                        /* Time */
 475                 l2n(Time,p);
 476                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 477
 478                 /* Do the message type and length last */
 479                 d=p= &(buf[4]);
 480
 481                 *(p++)=s->version>>8;
 482                 *(p++)=s->version&0xff;
 483                 s->client_version=s->version;
 484
 485                 /* Random stuff */
 486                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 487                 p+=SSL3_RANDOM_SIZE;
 488
 489                 /* Session ID */
 490                 if (s->new_session)
 491                         i=0;
 492                 else
 493                         i=s->session->session_id_length;
 494                 *(p++)=i;
 495                 if (i != 0)
 496                         {
 497                         memcpy(p,s->session->session_id,i);
 498                         p+=i;
 499                         }
 500
 501                 /* Ciphers supported */
 502                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 503                 if (i == 0)
 504                         {
 505                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 506                         goto err;
 507                         }
 508                 s2n(i,p);
 509                 p+=i;
 510
 511                 /* COMPRESSION */
 512                 if (s->ctx->comp_methods == NULL)
 513                         j=0;
 514                 else
 515                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 516                 *(p++)=1+j;
 517                 for (i=0; i<j; i++)
 518                         {
 519                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 520                         *(p++)=comp->id;
 521                         }
 522                 *(p++)=0; /* Add the NULL method */
 523
 524                 l=(p-d);
 525                 d=buf;
 526                 *(d++)=SSL3_MT_CLIENT_HELLO;
 527                 l2n3(l,d);
 528
 529                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 530                 /* number of bytes to write */
 531                 s->init_num=p-buf;
 532                 s->init_off=0;
 533                 }
 534
 535         /* SSL3_ST_CW_CLNT_HELLO_B */
 536         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 537 err:
 538         return(-1);
 539         }
 540
 541 static int ssl3_get_server_hello(SSL *s)
 542         {
 543         STACK_OF(SSL_CIPHER) *sk;
 544         SSL_CIPHER *c;
 545         unsigned char *p,*d;
 546         int i,al,ok;
 547         unsigned int j;
 548         long n;
 549         SSL_COMP *comp;
 550
 551         n=ssl3_get_message(s,
 552                 SSL3_ST_CR_SRVR_HELLO_A,
 553                 SSL3_ST_CR_SRVR_HELLO_B,
 554                 SSL3_MT_SERVER_HELLO,
 555                 300, /* ?? */
 556                 &ok);
 557
 558         if (!ok) return((int)n);
 559         d=p=(unsigned char *)s->init_buf->data;
 560
 561         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 562                 {
 563                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 564                 s->version=(s->version&0xff00)|p[1];
 565                 al=SSL_AD_PROTOCOL_VERSION;
 566                 goto f_err;
 567                 }
 568         p+=2;
 569
 570         /* load the server hello data */
 571         /* load the server random */
 572         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 573         p+=SSL3_RANDOM_SIZE;
 574
 575         /* get the session-id */
 576         j= *(p++);
 577
 578         if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
 579                 {
 580                 /* SSLref returns 16 :-( */
 581                 if (j < SSL2_SSL_SESSION_ID_LENGTH)
 582                         {
 583                         al=SSL_AD_ILLEGAL_PARAMETER;
 584                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
 585                         goto f_err;
 586                         }
 587                 }
 588         if (j != 0 && j == s->session->session_id_length
 589             && memcmp(p,s->session->session_id,j) == 0)
 590             {
 591             if(s->sid_ctx_length != s->session->sid_ctx_length
 592                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 593                 {
 594                 al=SSL_AD_ILLEGAL_PARAMETER;
 595                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 596                 goto f_err;
 597                 }
 598             s->hit=1;
 599             }
 600         else    /* a miss or crap from the other end */
 601                 {
 602                 /* If we were trying for session-id reuse, make a new
 603                  * SSL_SESSION so we don't stuff up other people */
 604                 s->hit=0;
 605                 if (s->session->session_id_length > 0)
 606                         {
 607                         if (!ssl_get_new_session(s,0))
 608                                 {
 609                                 al=SSL_AD_INTERNAL_ERROR;
 610                                 goto f_err;
 611                                 }
 612                         }
 613                 s->session->session_id_length=j;
 614                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 615                 }
 616         p+=j;
 617         c=ssl_get_cipher_by_char(s,p);
 618         if (c == NULL)
 619                 {
 620                 /* unknown cipher */
 621                 al=SSL_AD_ILLEGAL_PARAMETER;
 622                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 623                 goto f_err;
 624                 }
 625         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 626
 627         sk=ssl_get_ciphers_by_id(s);
 628         i=sk_SSL_CIPHER_find(sk,c);
 629         if (i < 0)
 630                 {
 631                 /* we did not say we would use this cipher */
 632                 al=SSL_AD_ILLEGAL_PARAMETER;
 633                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 634                 goto f_err;
 635                 }
 636
 637         if (s->hit && (s->session->cipher != c))
 638                 {
 639                 if (!(s->options &
 640                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 641                         {
 642                         al=SSL_AD_ILLEGAL_PARAMETER;
 643                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 644                         goto f_err;
 645                         }
 646                 }
 647         s->s3->tmp.new_cipher=c;
 648
 649         /* lets get the compression algorithm */
 650         /* COMPRESSION */
 651         j= *(p++);
 652         if (j == 0)
 653                 comp=NULL;
 654         else
 655                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 656
 657         if ((j != 0) && (comp == NULL))
 658                 {
 659                 al=SSL_AD_ILLEGAL_PARAMETER;
 660                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 661                 goto f_err;
 662                 }
 663         else
 664                 {
 665                 s->s3->tmp.new_compression=comp;
 666                 }
 667
 668         if (p != (d+n))
 669                 {
 670                 /* wrong packet length */
 671                 al=SSL_AD_DECODE_ERROR;
 672                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 673                 goto err;
 674                 }
 675
 676         return(1);
 677 f_err:
 678         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 679 err:
 680         return(-1);
 681         }
 682
 683 static int ssl3_get_server_certificate(SSL *s)
 684         {
 685         int al,i,ok,ret= -1;
 686         unsigned long n,nc,llen,l;
 687         X509 *x=NULL;
 688         unsigned char *p,*d,*q;
 689         STACK_OF(X509) *sk=NULL;
 690         SESS_CERT *sc;
 691         EVP_PKEY *pkey=NULL;
 692         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 693
 694         n=ssl3_get_message(s,
 695                 SSL3_ST_CR_CERT_A,
 696                 SSL3_ST_CR_CERT_B,
 697                 -1,
 698 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN32)
 699                 1024*30, /* 30k max cert list :-) */
 700 #else
 701                 1024*100, /* 100k max cert list :-) */
 702 #endif
 703                 &ok);
 704
 705         if (!ok) return((int)n);
 706
 707         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 708                 {
 709                 s->s3->tmp.reuse_message=1;
 710                 return(1);
 711                 }
 712
 713         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 714                 {
 715                 al=SSL_AD_UNEXPECTED_MESSAGE;
 716                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 717                 goto f_err;
 718                 }
 719         d=p=(unsigned char *)s->init_buf->data;
 720
 721         if ((sk=sk_X509_new_null()) == NULL)
 722                 {
 723                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 724                 goto err;
 725                 }
 726
 727         n2l3(p,llen);
 728         if (llen+3 != n)
 729                 {
 730                 al=SSL_AD_DECODE_ERROR;
 731                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 732                 goto f_err;
 733                 }
 734         for (nc=0; nc<llen; )
 735                 {
 736                 n2l3(p,l);
 737                 if ((l+nc+3) > llen)
 738                         {
 739                         al=SSL_AD_DECODE_ERROR;
 740                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 741                         goto f_err;
 742                         }
 743
 744                 q=p;
 745                 x=d2i_X509(NULL,&q,l);
 746                 if (x == NULL)
 747                         {
 748                         al=SSL_AD_BAD_CERTIFICATE;
 749                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 750                         goto f_err;
 751                         }
 752                 if (q != (p+l))
 753                         {
 754                         al=SSL_AD_DECODE_ERROR;
 755                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 756                         goto f_err;
 757                         }
 758                 if (!sk_X509_push(sk,x))
 759                         {
 760                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 761                         goto err;
 762                         }
 763                 x=NULL;
 764                 nc+=l+3;
 765                 p=q;
 766                 }
 767
 768         i=ssl_verify_cert_chain(s,sk);
 769         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
 770 #ifndef OPENSSL_NO_KRB5
 771                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 772                 != (SSL_aKRB5|SSL_kKRB5)
 773 #endif /* OPENSSL_NO_KRB5 */
 774                 )
 775                 {
 776                 al=ssl_verify_alarm_type(s->verify_result);
 777                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 778                 goto f_err;
 779                 }
 780         ERR_clear_error(); /* but we keep s->verify_result */
 781
 782         sc=ssl_sess_cert_new();
 783         if (sc == NULL) goto err;
 784
 785         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 786         s->session->sess_cert=sc;
 787
 788         sc->cert_chain=sk;
 789         /* Inconsistency alert: cert_chain does include the peer's
 790          * certificate, which we don't include in s3_srvr.c */
 791         x=sk_X509_value(sk,0);
 792         sk=NULL;
 793         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
 794
 795         pkey=X509_get_pubkey(x);
 796
 797         /* VRS: allow null cert if auth == KRB5 */
 798         need_cert =     ((s->s3->tmp.new_cipher->algorithms
 799                         & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 800                         == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 801
 802 #ifdef KSSL_DEBUG
 803         printf("pkey,x = %p, %p\n", pkey,x);
 804         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 805         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 806                 s->s3->tmp.new_cipher->algorithms, need_cert);
 807 #endif    /* KSSL_DEBUG */
 808
 809         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 810                 {
 811                 x=NULL;
 812                 al=SSL3_AL_FATAL;
 813                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 814                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 815                 goto f_err;
 816                 }
 817
 818         i=ssl_cert_type(x,pkey);
 819         if (need_cert && i < 0)
 820                 {
 821                 x=NULL;
 822                 al=SSL3_AL_FATAL;
 823                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
 824                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 825                 goto f_err;
 826                 }
 827
 828         if (need_cert)
 829                 {
 830                 sc->peer_cert_type=i;
 831                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 832                 /* Why would the following ever happen?
 833                  * We just created sc a couple of lines ago. */
 834                 if (sc->peer_pkeys[i].x509 != NULL)
 835                         X509_free(sc->peer_pkeys[i].x509);
 836                 sc->peer_pkeys[i].x509=x;
 837                 sc->peer_key= &(sc->peer_pkeys[i]);
 838
 839                 if (s->session->peer != NULL)
 840                         X509_free(s->session->peer);
 841                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 842                 s->session->peer=x;
 843                 }
 844         else
 845                 {
 846                 sc->peer_cert_type=i;
 847                 sc->peer_key= NULL;
 848
 849                 if (s->session->peer != NULL)
 850                         X509_free(s->session->peer);
 851                 s->session->peer=NULL;
 852                 }
 853         s->session->verify_result = s->verify_result;
 854
 855         x=NULL;
 856         ret=1;
 857
 858         if (0)
 859                 {
 860 f_err:
 861                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 862                 }
 863 err:
 864         EVP_PKEY_free(pkey);
 865         X509_free(x);
 866         sk_X509_pop_free(sk,X509_free);
 867         return(ret);
 868         }
 869
 870 static int ssl3_get_key_exchange(SSL *s)
 871         {
 872 #ifndef OPENSSL_NO_RSA
 873         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 874 #endif
 875         EVP_MD_CTX md_ctx;
 876         unsigned char *param,*p;
 877         int al,i,j,param_len,ok;
 878         long n,alg;
 879         EVP_PKEY *pkey=NULL;
 880 #ifndef OPENSSL_NO_RSA
 881         RSA *rsa=NULL;
 882 #endif
 883 #ifndef OPENSSL_NO_DH
 884         DH *dh=NULL;
 885 #endif
 886
 887         n=ssl3_get_message(s,
 888                 SSL3_ST_CR_KEY_EXCH_A,
 889                 SSL3_ST_CR_KEY_EXCH_B,
 890                 -1,
 891                 1024*8, /* ?? */
 892                 &ok);
 893
 894         if (!ok) return((int)n);
 895
 896         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 897                 {
 898                 s->s3->tmp.reuse_message=1;
 899                 return(1);
 900                 }
 901
 902         param=p=(unsigned char *)s->init_buf->data;
 903
 904         if (s->session->sess_cert != NULL)
 905                 {
 906 #ifndef OPENSSL_NO_RSA
 907                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
 908                         {
 909                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
 910                         s->session->sess_cert->peer_rsa_tmp=NULL;
 911                         }
 912 #endif
 913 #ifndef OPENSSL_NO_DH
 914                 if (s->session->sess_cert->peer_dh_tmp)
 915                         {
 916                         DH_free(s->session->sess_cert->peer_dh_tmp);
 917                         s->session->sess_cert->peer_dh_tmp=NULL;
 918                         }
 919 #endif
 920                 }
 921         else
 922                 {
 923                 s->session->sess_cert=ssl_sess_cert_new();
 924                 }
 925
 926         param_len=0;
 927         alg=s->s3->tmp.new_cipher->algorithms;
 928
 929 #ifndef OPENSSL_NO_RSA
 930         if (alg & SSL_kRSA)
 931                 {
 932                 if ((rsa=RSA_new()) == NULL)
 933                         {
 934                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 935                         goto err;
 936                         }
 937                 n2s(p,i);
 938                 param_len=i+2;
 939                 if (param_len > n)
 940                         {
 941                         al=SSL_AD_DECODE_ERROR;
 942                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
 943                         goto f_err;
 944                         }
 945                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
 946                         {
 947                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 948                         goto err;
 949                         }
 950                 p+=i;
 951
 952                 n2s(p,i);
 953                 param_len+=i+2;
 954                 if (param_len > n)
 955                         {
 956                         al=SSL_AD_DECODE_ERROR;
 957                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
 958                         goto f_err;
 959                         }
 960                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
 961                         {
 962                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 963                         goto err;
 964                         }
 965                 p+=i;
 966                 n-=param_len;
 967
 968                 /* this should be because we are using an export cipher */
 969                 if (alg & SSL_aRSA)
 970                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 971                 else
 972                         {
 973                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 974                         goto err;
 975                         }
 976                 s->session->sess_cert->peer_rsa_tmp=rsa;
 977                 rsa=NULL;
 978                 }
 979 #else /* OPENSSL_NO_RSA */
 980         if (0)
 981                 ;
 982 #endif
 983 #ifndef OPENSSL_NO_DH
 984         else if (alg & SSL_kEDH)
 985                 {
 986                 if ((dh=DH_new()) == NULL)
 987                         {
 988                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
 989                         goto err;
 990                         }
 991                 n2s(p,i);
 992                 param_len=i+2;
 993                 if (param_len > n)
 994                         {
 995                         al=SSL_AD_DECODE_ERROR;
 996                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
 997                         goto f_err;
 998                         }
 999                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1000                         {
1001                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1002                         goto err;
1003                         }
1004                 p+=i;
1005
1006                 n2s(p,i);
1007                 param_len+=i+2;
1008                 if (param_len > n)
1009                         {
1010                         al=SSL_AD_DECODE_ERROR;
1011                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1012                         goto f_err;
1013                         }
1014                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1015                         {
1016                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1017                         goto err;
1018                         }
1019                 p+=i;
1020
1021                 n2s(p,i);
1022                 param_len+=i+2;
1023                 if (param_len > n)
1024                         {
1025                         al=SSL_AD_DECODE_ERROR;
1026                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1027                         goto f_err;
1028                         }
1029                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1030                         {
1031                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1032                         goto err;
1033                         }
1034                 p+=i;
1035                 n-=param_len;
1036
1037 #ifndef OPENSSL_NO_RSA
1038                 if (alg & SSL_aRSA)
1039                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1040 #else
1041                 if (0)
1042                         ;
1043 #endif
1044 #ifndef OPENSSL_NO_DSA
1045                 else if (alg & SSL_aDSS)
1046                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1047 #endif
1048                 /* else anonymous DH, so no certificate or pkey. */
1049
1050                 s->session->sess_cert->peer_dh_tmp=dh;
1051                 dh=NULL;
1052                 }
1053         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1054                 {
1055                 al=SSL_AD_ILLEGAL_PARAMETER;
1056                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1057                 goto f_err;
1058                 }
1059 #endif /* !OPENSSL_NO_DH */
1060         if (alg & SSL_aFZA)
1061                 {
1062                 al=SSL_AD_HANDSHAKE_FAILURE;
1063                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1064                 goto f_err;
1065                 }
1066
1067
1068         /* p points to the next byte, there are 'n' bytes left */
1069
1070
1071         /* if it was signed, check the signature */
1072         if (pkey != NULL)
1073                 {
1074                 n2s(p,i);
1075                 n-=2;
1076                 j=EVP_PKEY_size(pkey);
1077
1078                 if ((i != n) || (n > j) || (n <= 0))
1079                         {
1080                         /* wrong packet length */
1081                         al=SSL_AD_DECODE_ERROR;
1082                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1083                         goto f_err;
1084                         }
1085
1086 #ifndef OPENSSL_NO_RSA
1087                 if (pkey->type == EVP_PKEY_RSA)
1088                         {
1089                         int num;
1090
1091                         j=0;
1092                         q=md_buf;
1093                         for (num=2; num > 0; num--)
1094                                 {
1095                                 EVP_DigestInit(&md_ctx,(num == 2)
1096                                         ?s->ctx->md5:s->ctx->sha1);
1097                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1098                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1099                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1100                                 EVP_DigestFinal(&md_ctx,q,(unsigned int *)&i);
1101                                 q+=i;
1102                                 j+=i;
1103                                 }
1104                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1105                                                                 pkey->pkey.rsa);
1106                         if (i < 0)
1107                                 {
1108                                 al=SSL_AD_DECRYPT_ERROR;
1109                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1110                                 goto f_err;
1111                                 }
1112                         if (i == 0)
1113                                 {
1114                                 /* bad signature */
1115                                 al=SSL_AD_DECRYPT_ERROR;
1116                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1117                                 goto f_err;
1118                                 }
1119                         }
1120                 else
1121 #endif
1122 #ifndef OPENSSL_NO_DSA
1123                         if (pkey->type == EVP_PKEY_DSA)
1124                         {
1125                         /* lets do DSS */
1126                         EVP_VerifyInit(&md_ctx,EVP_dss1());
1127                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1128                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1129                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1130                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1131                                 {
1132                                 /* bad signature */
1133                                 al=SSL_AD_DECRYPT_ERROR;
1134                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1135                                 goto f_err;
1136                                 }
1137                         }
1138                 else
1139 #endif
1140                         {
1141                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1142                         goto err;
1143                         }
1144                 }
1145         else
1146                 {
1147                 /* still data left over */
1148                 if (!(alg & SSL_aNULL))
1149                         {
1150                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1151                         goto err;
1152                         }
1153                 if (n != 0)
1154                         {
1155                         al=SSL_AD_DECODE_ERROR;
1156                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1157                         goto f_err;
1158                         }
1159                 }
1160         EVP_PKEY_free(pkey);
1161         return(1);
1162 f_err:
1163         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1164 err:
1165         EVP_PKEY_free(pkey);
1166 #ifndef OPENSSL_NO_RSA
1167         if (rsa != NULL)
1168                 RSA_free(rsa);
1169 #endif
1170 #ifndef OPENSSL_NO_DH
1171         if (dh != NULL)
1172                 DH_free(dh);
1173 #endif
1174         return(-1);
1175         }
1176
1177 static int ssl3_get_certificate_request(SSL *s)
1178         {
1179         int ok,ret=0;
1180         unsigned long n,nc,l;
1181         unsigned int llen,ctype_num,i;
1182         X509_NAME *xn=NULL;
1183         unsigned char *p,*d,*q;
1184         STACK_OF(X509_NAME) *ca_sk=NULL;
1185
1186         n=ssl3_get_message(s,
1187                 SSL3_ST_CR_CERT_REQ_A,
1188                 SSL3_ST_CR_CERT_REQ_B,
1189                 -1,
1190 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN32)
1191                 1024*30,  /* 30k max cert list :-) */
1192 #else
1193                 1024*100, /* 100k max cert list :-) */
1194 #endif
1195                 &ok);
1196
1197         if (!ok) return((int)n);
1198
1199         s->s3->tmp.cert_req=0;
1200
1201         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1202                 {
1203                 s->s3->tmp.reuse_message=1;
1204                 return(1);
1205                 }
1206
1207         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1208                 {
1209                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1210                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1211                 goto err;
1212                 }
1213
1214         /* TLS does not like anon-DH with client cert */
1215         if (s->version > SSL3_VERSION)
1216                 {
1217                 l=s->s3->tmp.new_cipher->algorithms;
1218                 if (l & SSL_aNULL)
1219                         {
1220                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1221                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1222                         goto err;
1223                         }
1224                 }
1225
1226         d=p=(unsigned char *)s->init_buf->data;
1227
1228         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1229                 {
1230                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1231                 goto err;
1232                 }
1233
1234         /* get the certificate types */
1235         ctype_num= *(p++);
1236         if (ctype_num > SSL3_CT_NUMBER)
1237                 ctype_num=SSL3_CT_NUMBER;
1238         for (i=0; i<ctype_num; i++)
1239                 s->s3->tmp.ctype[i]= p[i];
1240         p+=ctype_num;
1241
1242         /* get the CA RDNs */
1243         n2s(p,llen);
1244 #if 0
1245 {
1246 FILE *out;
1247 out=fopen("/tmp/vsign.der","w");
1248 fwrite(p,1,llen,out);
1249 fclose(out);
1250 }
1251 #endif
1252
1253         if ((llen+ctype_num+2+1) != n)
1254                 {
1255                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1256                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1257                 goto err;
1258                 }
1259
1260         for (nc=0; nc<llen; )
1261                 {
1262                 n2s(p,l);
1263                 if ((l+nc+2) > llen)
1264                         {
1265                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1266                                 goto cont; /* netscape bugs */
1267                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1268                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1269                         goto err;
1270                         }
1271
1272                 q=p;
1273
1274                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1275                         {
1276                         /* If netscape tolerance is on, ignore errors */
1277                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1278                                 goto cont;
1279                         else
1280                                 {
1281                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1282                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1283                                 goto err;
1284                                 }
1285                         }
1286
1287                 if (q != (p+l))
1288                         {
1289                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1290                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1291                         goto err;
1292                         }
1293                 if (!sk_X509_NAME_push(ca_sk,xn))
1294                         {
1295                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1296                         goto err;
1297                         }
1298
1299                 p+=l;
1300                 nc+=l+2;
1301                 }
1302
1303         if (0)
1304                 {
1305 cont:
1306                 ERR_clear_error();
1307                 }
1308
1309         /* we should setup a certificate to return.... */
1310         s->s3->tmp.cert_req=1;
1311         s->s3->tmp.ctype_num=ctype_num;
1312         if (s->s3->tmp.ca_names != NULL)
1313                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1314         s->s3->tmp.ca_names=ca_sk;
1315         ca_sk=NULL;
1316
1317         ret=1;
1318 err:
1319         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1320         return(ret);
1321         }
1322
1323 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1324         {
1325         return(X509_NAME_cmp(*a,*b));
1326         }
1327
1328 static int ssl3_get_server_done(SSL *s)
1329         {
1330         int ok,ret=0;
1331         long n;
1332
1333         n=ssl3_get_message(s,
1334                 SSL3_ST_CR_SRVR_DONE_A,
1335                 SSL3_ST_CR_SRVR_DONE_B,
1336                 SSL3_MT_SERVER_DONE,
1337                 30, /* should be very small, like 0 :-) */
1338                 &ok);
1339
1340         if (!ok) return((int)n);
1341         if (n > 0)
1342                 {
1343                 /* should contain no data */
1344                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1345                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1346                 }
1347         ret=1;
1348         return(ret);
1349         }
1350
1351 static int ssl3_send_client_key_exchange(SSL *s)
1352         {
1353         unsigned char *p,*d;
1354         int n;
1355         unsigned long l;
1356 #ifndef OPENSSL_NO_RSA
1357         unsigned char *q;
1358         EVP_PKEY *pkey=NULL;
1359 #endif
1360 #ifndef OPENSSL_NO_KRB5
1361         KSSL_ERR kssl_err;
1362 #endif /* OPENSSL_NO_KRB5 */
1363
1364         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1365                 {
1366                 d=(unsigned char *)s->init_buf->data;
1367                 p= &(d[4]);
1368
1369                 l=s->s3->tmp.new_cipher->algorithms;
1370
1371                 /* Fool emacs indentation */
1372                 if (0) {}
1373 #ifndef OPENSSL_NO_RSA
1374                 else if (l & SSL_kRSA)
1375                         {
1376                         RSA *rsa;
1377                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1378
1379                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1380                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1381                         else
1382                                 {
1383                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1384                                 if ((pkey == NULL) ||
1385                                         (pkey->type != EVP_PKEY_RSA) ||
1386                                         (pkey->pkey.rsa == NULL))
1387                                         {
1388                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1389                                         goto err;
1390                                         }
1391                                 rsa=pkey->pkey.rsa;
1392                                 EVP_PKEY_free(pkey);
1393                                 }
1394
1395                         tmp_buf[0]=s->client_version>>8;
1396                         tmp_buf[1]=s->client_version&0xff;
1397                         if (RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2) <= 0)
1398                                         goto err;
1399
1400                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1401
1402                         q=p;
1403                         /* Fix buf for TLS and beyond */
1404                         if (s->version > SSL3_VERSION)
1405                                 p+=2;
1406                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1407                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1408 #ifdef PKCS1_CHECK
1409                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1410                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1411 #endif
1412                         if (n <= 0)
1413                                 {
1414                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1415                                 goto err;
1416                                 }
1417
1418                         /* Fix buf for TLS and beyond */
1419                         if (s->version > SSL3_VERSION)
1420                                 {
1421                                 s2n(n,q);
1422                                 n+=2;
1423                                 }
1424
1425                         s->session->master_key_length=
1426                                 s->method->ssl3_enc->generate_master_secret(s,
1427                                         s->session->master_key,
1428                                         tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1429                         memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1430                         }
1431 #endif
1432 #ifndef OPENSSL_NO_KRB5
1433                 else if (l & SSL_kKRB5)
1434                         {
1435                         krb5_error_code krb5rc;
1436                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1437                         /*  krb5_data   krb5_ap_req;  */
1438                         krb5_data       *enc_ticket;
1439                         krb5_data       authenticator, *authp = NULL;
1440                         EVP_CIPHER_CTX  ciph_ctx;
1441                         EVP_CIPHER      *enc = NULL;
1442                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1443                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1444                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1445                                                 + EVP_MAX_IV_LENGTH];
1446                         int             padl, outl = sizeof(epms);
1447
1448 #ifdef KSSL_DEBUG
1449                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1450                                 l, SSL_kKRB5);
1451 #endif  /* KSSL_DEBUG */
1452
1453                         authp = NULL;
1454 #ifdef KRB5SENDAUTH
1455                         if (KRB5SENDAUTH)  authp = &authenticator;
1456 #endif  /* KRB5SENDAUTH */
1457
1458                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1459                                 &kssl_err);
1460                         enc = kssl_map_enc(kssl_ctx->enctype);
1461 #ifdef KSSL_DEBUG
1462                         {
1463                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1464                         if (krb5rc && kssl_err.text)
1465                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1466                         }
1467 #endif  /* KSSL_DEBUG */
1468
1469                         if (krb5rc)
1470                                 {
1471                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1472                                                 SSL_AD_HANDSHAKE_FAILURE);
1473                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1474                                                 kssl_err.reason);
1475                                 goto err;
1476                                 }
1477
1478                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1479                         **  in place of RFC 2712 KerberosWrapper, as in:
1480                         **
1481                         **  Send ticket (copy to *p, set n = length)
1482                         **  n = krb5_ap_req.length;
1483                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1484                         **  if (krb5_ap_req.data)
1485                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1486                         **
1487                         **  Now using real RFC 2712 KerberosWrapper
1488                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1489                         **  Note: 2712 "opaque" types are here replaced
1490                         **  with a 2-byte length followed by the value.
1491                         **  Example:
1492                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1493                         **  Where "xx xx" = length bytes.  Shown here with
1494                         **  optional authenticator omitted.
1495                         */
1496
1497                         /*  KerberosWrapper.Ticket              */
1498                         s2n(enc_ticket->length,p);
1499                         memcpy(p, enc_ticket->data, enc_ticket->length);
1500                         p+= enc_ticket->length;
1501                         n = enc_ticket->length + 2;
1502
1503                         /*  KerberosWrapper.Authenticator       */
1504                         if (authp  &&  authp->length)
1505                                 {
1506                                 s2n(authp->length,p);
1507                                 memcpy(p, authp->data, authp->length);
1508                                 p+= authp->length;
1509                                 n+= authp->length + 2;
1510
1511                                 free(authp->data);
1512                                 authp->data = NULL;
1513                                 authp->length = 0;
1514                                 }
1515                         else
1516                                 {
1517                                 s2n(0,p);/*  null authenticator length  */
1518                                 n+=2;
1519                                 }
1520
1521                         if (RAND_bytes(tmp_buf,SSL_MAX_MASTER_KEY_LENGTH) <= 0)
1522                             goto err;
1523
1524                         /*  20010420 VRS.  Tried it this way; failed.
1525                         **      EVP_EncryptInit(&ciph_ctx,enc, NULL,NULL);
1526                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1527                         **                              kssl_ctx->length);
1528                         **      EVP_EncryptInit(&ciph_ctx,NULL, key,iv);
1529                         */
1530
1531                         memset(iv, 0, EVP_MAX_IV_LENGTH);  /* per RFC 1510 */
1532                         EVP_EncryptInit(&ciph_ctx,enc, kssl_ctx->key,iv);
1533                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1534                                                 SSL_MAX_MASTER_KEY_LENGTH);
1535                         EVP_EncryptFinal(&ciph_ctx,&(epms[outl]),&padl);
1536                         outl += padl;
1537                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1538
1539                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1540                         s2n(outl,p);
1541                         memcpy(p, epms, outl);
1542                         p+=outl;
1543                         n+=outl + 2;
1544
1545                         s->session->master_key_length=
1546                                 s->method->ssl3_enc->generate_master_secret(s,
1547                                         s->session->master_key,
1548                                         tmp_buf, SSL_MAX_MASTER_KEY_LENGTH);
1549
1550                         memset(tmp_buf, 0, SSL_MAX_MASTER_KEY_LENGTH);
1551                         memset(epms, 0, outl);
1552                         }
1553 #endif
1554 #ifndef OPENSSL_NO_DH
1555                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1556                         {
1557                         DH *dh_srvr,*dh_clnt;
1558
1559                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1560                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1561                         else
1562                                 {
1563                                 /* we get them from the cert */
1564                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1565                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1566                                 goto err;
1567                                 }
1568
1569                         /* generate a new random key */
1570                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1571                                 {
1572                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1573                                 goto err;
1574                                 }
1575                         if (!DH_generate_key(dh_clnt))
1576                                 {
1577                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1578                                 goto err;
1579                                 }
1580
1581                         /* use the 'p' output buffer for the DH key, but
1582                          * make sure to clear it out afterwards */
1583
1584                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1585
1586                         if (n <= 0)
1587                                 {
1588                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1589                                 goto err;
1590                                 }
1591
1592                         /* generate master key from the result */
1593                         s->session->master_key_length=
1594                                 s->method->ssl3_enc->generate_master_secret(s,
1595                                         s->session->master_key,p,n);
1596                         /* clean up */
1597                         memset(p,0,n);
1598
1599                         /* send off the data */
1600                         n=BN_num_bytes(dh_clnt->pub_key);
1601                         s2n(n,p);
1602                         BN_bn2bin(dh_clnt->pub_key,p);
1603                         n+=2;
1604
1605                         DH_free(dh_clnt);
1606
1607                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1608                         }
1609 #endif
1610                 else
1611                         {
1612                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1613                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1614                         goto err;
1615                         }
1616
1617                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1618                 l2n3(n,d);
1619
1620                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1621                 /* number of bytes to write */
1622                 s->init_num=n+4;
1623                 s->init_off=0;
1624                 }
1625
1626         /* SSL3_ST_CW_KEY_EXCH_B */
1627         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1628 err:
1629         return(-1);
1630         }
1631
1632 static int ssl3_send_client_verify(SSL *s)
1633         {
1634         unsigned char *p,*d;
1635         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1636         EVP_PKEY *pkey;
1637 #ifndef OPENSSL_NO_RSA
1638         unsigned u=0;
1639 #endif
1640         unsigned long n;
1641 #ifndef OPENSSL_NO_DSA
1642         int j;
1643 #endif
1644
1645         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1646                 {
1647                 d=(unsigned char *)s->init_buf->data;
1648                 p= &(d[4]);
1649                 pkey=s->cert->key->privatekey;
1650
1651                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1652                         &(data[MD5_DIGEST_LENGTH]));
1653
1654 #ifndef OPENSSL_NO_RSA
1655                 if (pkey->type == EVP_PKEY_RSA)
1656                         {
1657                         s->method->ssl3_enc->cert_verify_mac(s,
1658                                 &(s->s3->finish_dgst1),&(data[0]));
1659                         if (RSA_sign(NID_md5_sha1, data,
1660                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1661                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1662                                 {
1663                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1664                                 goto err;
1665                                 }
1666                         s2n(u,p);
1667                         n=u+2;
1668                         }
1669                 else
1670 #endif
1671 #ifndef OPENSSL_NO_DSA
1672                         if (pkey->type == EVP_PKEY_DSA)
1673                         {
1674                         if (!DSA_sign(pkey->save_type,
1675                                 &(data[MD5_DIGEST_LENGTH]),
1676                                 SHA_DIGEST_LENGTH,&(p[2]),
1677                                 (unsigned int *)&j,pkey->pkey.dsa))
1678                                 {
1679                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1680                                 goto err;
1681                                 }
1682                         s2n(j,p);
1683                         n=j+2;
1684                         }
1685                 else
1686 #endif
1687                         {
1688                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1689                         goto err;
1690                         }
1691                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1692                 l2n3(n,d);
1693
1694                 s->init_num=(int)n+4;
1695                 s->init_off=0;
1696                 }
1697         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1698 err:
1699         return(-1);
1700         }
1701
1702 static int ssl3_send_client_certificate(SSL *s)
1703         {
1704         X509 *x509=NULL;
1705         EVP_PKEY *pkey=NULL;
1706         int i;
1707         unsigned long l;
1708
1709         if (s->state == SSL3_ST_CW_CERT_A)
1710                 {
1711                 if ((s->cert == NULL) ||
1712                         (s->cert->key->x509 == NULL) ||
1713                         (s->cert->key->privatekey == NULL))
1714                         s->state=SSL3_ST_CW_CERT_B;
1715                 else
1716                         s->state=SSL3_ST_CW_CERT_C;
1717                 }
1718
1719         /* We need to get a client cert */
1720         if (s->state == SSL3_ST_CW_CERT_B)
1721                 {
1722                 /* If we get an error, we need to
1723                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1724                  * We then get retied later */
1725                 i=0;
1726                 if (s->ctx->client_cert_cb != NULL)
1727                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1728                 if (i < 0)
1729                         {
1730                         s->rwstate=SSL_X509_LOOKUP;
1731                         return(-1);
1732                         }
1733                 s->rwstate=SSL_NOTHING;
1734                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1735                         {
1736                         s->state=SSL3_ST_CW_CERT_B;
1737                         if (    !SSL_use_certificate(s,x509) ||
1738                                 !SSL_use_PrivateKey(s,pkey))
1739                                 i=0;
1740                         }
1741                 else if (i == 1)
1742                         {
1743                         i=0;
1744                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1745                         }
1746
1747                 if (x509 != NULL) X509_free(x509);
1748                 if (pkey != NULL) EVP_PKEY_free(pkey);
1749                 if (i == 0)
1750                         {
1751                         if (s->version == SSL3_VERSION)
1752                                 {
1753                                 s->s3->tmp.cert_req=0;
1754                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1755                                 return(1);
1756                                 }
1757                         else
1758                                 {
1759                                 s->s3->tmp.cert_req=2;
1760                                 }
1761                         }
1762
1763                 /* Ok, we have a cert */
1764                 s->state=SSL3_ST_CW_CERT_C;
1765                 }
1766
1767         if (s->state == SSL3_ST_CW_CERT_C)
1768                 {
1769                 s->state=SSL3_ST_CW_CERT_D;
1770                 l=ssl3_output_cert_chain(s,
1771                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1772                 s->init_num=(int)l;
1773                 s->init_off=0;
1774                 }
1775         /* SSL3_ST_CW_CERT_D */
1776         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1777         }
1778
1779 #define has_bits(i,m)   (((i)&(m)) == (m))
1780
1781 static int ssl3_check_cert_and_algorithm(SSL *s)
1782         {
1783         int i,idx;
1784         long algs;
1785         EVP_PKEY *pkey=NULL;
1786         SESS_CERT *sc;
1787 #ifndef OPENSSL_NO_RSA
1788         RSA *rsa;
1789 #endif
1790 #ifndef OPENSSL_NO_DH
1791         DH *dh;
1792 #endif
1793
1794         sc=s->session->sess_cert;
1795
1796         if (sc == NULL)
1797                 {
1798                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
1799                 goto err;
1800                 }
1801
1802         algs=s->s3->tmp.new_cipher->algorithms;
1803
1804         /* we don't have a certificate */
1805         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
1806                 return(1);
1807
1808 #ifndef OPENSSL_NO_RSA
1809         rsa=s->session->sess_cert->peer_rsa_tmp;
1810 #endif
1811 #ifndef OPENSSL_NO_DH
1812         dh=s->session->sess_cert->peer_dh_tmp;
1813 #endif
1814
1815         /* This is the passed certificate */
1816
1817         idx=sc->peer_cert_type;
1818         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1819         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1820         EVP_PKEY_free(pkey);
1821
1822
1823         /* Check that we have a certificate if we require one */
1824         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1825                 {
1826                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1827                 goto f_err;
1828                 }
1829 #ifndef OPENSSL_NO_DSA
1830         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1831                 {
1832                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1833                 goto f_err;
1834                 }
1835 #endif
1836 #ifndef OPENSSL_NO_RSA
1837         if ((algs & SSL_kRSA) &&
1838                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1839                 {
1840                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1841                 goto f_err;
1842                 }
1843 #endif
1844 #ifndef OPENSSL_NO_DH
1845         if ((algs & SSL_kEDH) &&
1846                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1847                 {
1848                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1849                 goto f_err;
1850                 }
1851         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1852                 {
1853                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1854                 goto f_err;
1855                 }
1856 #ifndef OPENSSL_NO_DSA
1857         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1858                 {
1859                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1860                 goto f_err;
1861                 }
1862 #endif
1863 #endif
1864
1865         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
1866                 {
1867 #ifndef OPENSSL_NO_RSA
1868                 if (algs & SSL_kRSA)
1869                         {
1870                         if (rsa == NULL
1871                             || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1872                                 {
1873                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1874                                 goto f_err;
1875                                 }
1876                         }
1877                 else
1878 #endif
1879 #ifndef OPENSSL_NO_DH
1880                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1881                             {
1882                             if (dh == NULL
1883                                 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1884                                 {
1885                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1886                                 goto f_err;
1887                                 }
1888                         }
1889                 else
1890 #endif
1891                         {
1892                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1893                         goto f_err;
1894                         }
1895                 }
1896         return(1);
1897 f_err:
1898         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1899 err:
1900         return(0);
1901         }
1902