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