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.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                 {
 771                 al=ssl_verify_alarm_type(s->verify_result);
 772                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 773                 goto f_err;
 774                 }
 775         ERR_clear_error(); /* but we keep s->verify_result */
 776
 777         sc=ssl_sess_cert_new();
 778         if (sc == NULL) goto err;
 779
 780         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 781         s->session->sess_cert=sc;
 782
 783         sc->cert_chain=sk;
 784         /* Inconsistency alert: cert_chain does include the peer's
 785          * certificate, which we don't include in s3_srvr.c */
 786         x=sk_X509_value(sk,0);
 787         sk=NULL;
 788         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end */
 789
 790         pkey=X509_get_pubkey(x);
 791
 792         /* VRS: allow null cert if auth == KRB5 */
 793         need_cert =
 794                 ((s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 795                         == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 796
 797 #ifdef KSSL_DEBUG
 798         printf("pkey,x = %p, %p\n", pkey,x);
 799         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 800         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 801                 s->s3->tmp.new_cipher->algorithms, need_cert);
 802 #endif    /* KSSL_DEBUG */
 803
 804         if (need_cert  &&  ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 805                 {
 806                 x=NULL;
 807                 al=SSL3_AL_FATAL;
 808                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,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,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 818                 goto f_err;
 819                 }
 820
 821         if (need_cert)
 822                 {
 823                 sc->peer_cert_type=i;
 824                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 825                 /* Why would the following ever happen?
 826                  * We just created sc a couple of lines ago. */
 827                 if (sc->peer_pkeys[i].x509 != NULL)
 828                         X509_free(sc->peer_pkeys[i].x509);
 829                 sc->peer_pkeys[i].x509=x;
 830                 sc->peer_key= &(sc->peer_pkeys[i]);
 831
 832                 if (s->session->peer != NULL)
 833                         X509_free(s->session->peer);
 834                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 835                 s->session->peer=x;
 836                 }
 837         else
 838                 {
 839                 sc->peer_cert_type=i;
 840                 sc->peer_key= NULL;
 841
 842                 if (s->session->peer != NULL)
 843                         X509_free(s->session->peer);
 844                 s->session->peer=NULL;
 845                 }
 846         s->session->verify_result = s->verify_result;
 847
 848         x=NULL;
 849         ret=1;
 850
 851         if (0)
 852                 {
 853 f_err:
 854                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 855                 }
 856 err:
 857         EVP_PKEY_free(pkey);
 858         X509_free(x);
 859         sk_X509_pop_free(sk,X509_free);
 860         return(ret);
 861         }
 862
 863 static int ssl3_get_key_exchange(SSL *s)
 864         {
 865 #ifndef OPENSSL_NO_RSA
 866         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 867 #endif
 868         EVP_MD_CTX md_ctx;
 869         unsigned char *param,*p;
 870         int al,i,j,param_len,ok;
 871         long n,alg;
 872         EVP_PKEY *pkey=NULL;
 873 #ifndef OPENSSL_NO_RSA
 874         RSA *rsa=NULL;
 875 #endif
 876 #ifndef OPENSSL_NO_DH
 877         DH *dh=NULL;
 878 #endif
 879
 880         n=ssl3_get_message(s,
 881                 SSL3_ST_CR_KEY_EXCH_A,
 882                 SSL3_ST_CR_KEY_EXCH_B,
 883                 -1,
 884                 1024*8, /* ?? */
 885                 &ok);
 886
 887         if (!ok) return((int)n);
 888
 889         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 890                 {
 891                 s->s3->tmp.reuse_message=1;
 892                 return(1);
 893                 }
 894
 895         param=p=(unsigned char *)s->init_buf->data;
 896
 897         if (s->session->sess_cert != NULL)
 898                 {
 899 #ifndef OPENSSL_NO_RSA
 900                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
 901                         {
 902                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
 903                         s->session->sess_cert->peer_rsa_tmp=NULL;
 904                         }
 905 #endif
 906 #ifndef OPENSSL_NO_DH
 907                 if (s->session->sess_cert->peer_dh_tmp)
 908                         {
 909                         DH_free(s->session->sess_cert->peer_dh_tmp);
 910                         s->session->sess_cert->peer_dh_tmp=NULL;
 911                         }
 912 #endif
 913                 }
 914         else
 915                 {
 916                 s->session->sess_cert=ssl_sess_cert_new();
 917                 }
 918
 919         param_len=0;
 920         alg=s->s3->tmp.new_cipher->algorithms;
 921
 922 #ifndef OPENSSL_NO_RSA
 923         if (alg & SSL_kRSA)
 924                 {
 925                 if ((rsa=RSA_new()) == NULL)
 926                         {
 927                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 928                         goto err;
 929                         }
 930                 n2s(p,i);
 931                 param_len=i+2;
 932                 if (param_len > n)
 933                         {
 934                         al=SSL_AD_DECODE_ERROR;
 935                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
 936                         goto f_err;
 937                         }
 938                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
 939                         {
 940                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 941                         goto err;
 942                         }
 943                 p+=i;
 944
 945                 n2s(p,i);
 946                 param_len+=i+2;
 947                 if (param_len > n)
 948                         {
 949                         al=SSL_AD_DECODE_ERROR;
 950                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
 951                         goto f_err;
 952                         }
 953                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
 954                         {
 955                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 956                         goto err;
 957                         }
 958                 p+=i;
 959                 n-=param_len;
 960
 961                 /* this should be because we are using an export cipher */
 962                 if (alg & SSL_aRSA)
 963                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 964                 else
 965                         {
 966                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 967                         goto err;
 968                         }
 969                 s->session->sess_cert->peer_rsa_tmp=rsa;
 970                 rsa=NULL;
 971                 }
 972 #else /* OPENSSL_NO_RSA */
 973         if (0)
 974                 ;
 975 #endif
 976 #ifndef OPENSSL_NO_DH
 977         else if (alg & SSL_kEDH)
 978                 {
 979                 if ((dh=DH_new()) == NULL)
 980                         {
 981                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
 982                         goto err;
 983                         }
 984                 n2s(p,i);
 985                 param_len=i+2;
 986                 if (param_len > n)
 987                         {
 988                         al=SSL_AD_DECODE_ERROR;
 989                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
 990                         goto f_err;
 991                         }
 992                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
 993                         {
 994                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 995                         goto err;
 996                         }
 997                 p+=i;
 998
 999                 n2s(p,i);
1000                 param_len+=i+2;
1001                 if (param_len > n)
1002                         {
1003                         al=SSL_AD_DECODE_ERROR;
1004                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1005                         goto f_err;
1006                         }
1007                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1008                         {
1009                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1010                         goto err;
1011                         }
1012                 p+=i;
1013
1014                 n2s(p,i);
1015                 param_len+=i+2;
1016                 if (param_len > n)
1017                         {
1018                         al=SSL_AD_DECODE_ERROR;
1019                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1020                         goto f_err;
1021                         }
1022                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1023                         {
1024                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1025                         goto err;
1026                         }
1027                 p+=i;
1028                 n-=param_len;
1029
1030 #ifndef OPENSSL_NO_RSA
1031                 if (alg & SSL_aRSA)
1032                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1033 #else
1034                 if (0)
1035                         ;
1036 #endif
1037 #ifndef OPENSSL_NO_DSA
1038                 else if (alg & SSL_aDSS)
1039                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1040 #endif
1041                 /* else anonymous DH, so no certificate or pkey. */
1042
1043                 s->session->sess_cert->peer_dh_tmp=dh;
1044                 dh=NULL;
1045                 }
1046         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1047                 {
1048                 al=SSL_AD_ILLEGAL_PARAMETER;
1049                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1050                 goto f_err;
1051                 }
1052 #endif /* !OPENSSL_NO_DH */
1053         if (alg & SSL_aFZA)
1054                 {
1055                 al=SSL_AD_HANDSHAKE_FAILURE;
1056                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1057                 goto f_err;
1058                 }
1059
1060
1061         /* p points to the next byte, there are 'n' bytes left */
1062
1063
1064         /* if it was signed, check the signature */
1065         if (pkey != NULL)
1066                 {
1067                 n2s(p,i);
1068                 n-=2;
1069                 j=EVP_PKEY_size(pkey);
1070
1071                 if ((i != n) || (n > j) || (n <= 0))
1072                         {
1073                         /* wrong packet length */
1074                         al=SSL_AD_DECODE_ERROR;
1075                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1076                         goto f_err;
1077                         }
1078
1079 #ifndef OPENSSL_NO_RSA
1080                 if (pkey->type == EVP_PKEY_RSA)
1081                         {
1082                         int num;
1083
1084                         j=0;
1085                         q=md_buf;
1086                         for (num=2; num > 0; num--)
1087                                 {
1088                                 EVP_DigestInit(&md_ctx,(num == 2)
1089                                         ?s->ctx->md5:s->ctx->sha1);
1090                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1091                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1092                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1093                                 EVP_DigestFinal(&md_ctx,q,(unsigned int *)&i);
1094                                 q+=i;
1095                                 j+=i;
1096                                 }
1097                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1098                                                                 pkey->pkey.rsa);
1099                         if (i < 0)
1100                                 {
1101                                 al=SSL_AD_DECRYPT_ERROR;
1102                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1103                                 goto f_err;
1104                                 }
1105                         if (i == 0)
1106                                 {
1107                                 /* bad signature */
1108                                 al=SSL_AD_DECRYPT_ERROR;
1109                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1110                                 goto f_err;
1111                                 }
1112                         }
1113                 else
1114 #endif
1115 #ifndef OPENSSL_NO_DSA
1116                         if (pkey->type == EVP_PKEY_DSA)
1117                         {
1118                         /* lets do DSS */
1119                         EVP_VerifyInit(&md_ctx,EVP_dss1());
1120                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1121                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1122                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1123                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1124                                 {
1125                                 /* bad signature */
1126                                 al=SSL_AD_DECRYPT_ERROR;
1127                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1128                                 goto f_err;
1129                                 }
1130                         }
1131                 else
1132 #endif
1133                         {
1134                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1135                         goto err;
1136                         }
1137                 }
1138         else
1139                 {
1140                 /* still data left over */
1141                 if (!(alg & SSL_aNULL))
1142                         {
1143                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1144                         goto err;
1145                         }
1146                 if (n != 0)
1147                         {
1148                         al=SSL_AD_DECODE_ERROR;
1149                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1150                         goto f_err;
1151                         }
1152                 }
1153         EVP_PKEY_free(pkey);
1154         return(1);
1155 f_err:
1156         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1157 err:
1158         EVP_PKEY_free(pkey);
1159 #ifndef OPENSSL_NO_RSA
1160         if (rsa != NULL)
1161                 RSA_free(rsa);
1162 #endif
1163 #ifndef OPENSSL_NO_DH
1164         if (dh != NULL)
1165                 DH_free(dh);
1166 #endif
1167         return(-1);
1168         }
1169
1170 static int ssl3_get_certificate_request(SSL *s)
1171         {
1172         int ok,ret=0;
1173         unsigned long n,nc,l;
1174         unsigned int llen,ctype_num,i;
1175         X509_NAME *xn=NULL;
1176         unsigned char *p,*d,*q;
1177         STACK_OF(X509_NAME) *ca_sk=NULL;
1178
1179         n=ssl3_get_message(s,
1180                 SSL3_ST_CR_CERT_REQ_A,
1181                 SSL3_ST_CR_CERT_REQ_B,
1182                 -1,
1183 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN32)
1184                 1024*30,  /* 30k max cert list :-) */
1185 #else
1186                 1024*100, /* 100k max cert list :-) */
1187 #endif
1188                 &ok);
1189
1190         if (!ok) return((int)n);
1191
1192         s->s3->tmp.cert_req=0;
1193
1194         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1195                 {
1196                 s->s3->tmp.reuse_message=1;
1197                 return(1);
1198                 }
1199
1200         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1201                 {
1202                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1203                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1204                 goto err;
1205                 }
1206
1207         /* TLS does not like anon-DH with client cert */
1208         if (s->version > SSL3_VERSION)
1209                 {
1210                 l=s->s3->tmp.new_cipher->algorithms;
1211                 if (l & SSL_aNULL)
1212                         {
1213                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1214                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1215                         goto err;
1216                         }
1217                 }
1218
1219         d=p=(unsigned char *)s->init_buf->data;
1220
1221         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1222                 {
1223                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1224                 goto err;
1225                 }
1226
1227         /* get the certificate types */
1228         ctype_num= *(p++);
1229         if (ctype_num > SSL3_CT_NUMBER)
1230                 ctype_num=SSL3_CT_NUMBER;
1231         for (i=0; i<ctype_num; i++)
1232                 s->s3->tmp.ctype[i]= p[i];
1233         p+=ctype_num;
1234
1235         /* get the CA RDNs */
1236         n2s(p,llen);
1237 #if 0
1238 {
1239 FILE *out;
1240 out=fopen("/tmp/vsign.der","w");
1241 fwrite(p,1,llen,out);
1242 fclose(out);
1243 }
1244 #endif
1245
1246         if ((llen+ctype_num+2+1) != n)
1247                 {
1248                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1249                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1250                 goto err;
1251                 }
1252
1253         for (nc=0; nc<llen; )
1254                 {
1255                 n2s(p,l);
1256                 if ((l+nc+2) > llen)
1257                         {
1258                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1259                                 goto cont; /* netscape bugs */
1260                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1261                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1262                         goto err;
1263                         }
1264
1265                 q=p;
1266
1267                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1268                         {
1269                         /* If netscape tolerance is on, ignore errors */
1270                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1271                                 goto cont;
1272                         else
1273                                 {
1274                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1275                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1276                                 goto err;
1277                                 }
1278                         }
1279
1280                 if (q != (p+l))
1281                         {
1282                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1283                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1284                         goto err;
1285                         }
1286                 if (!sk_X509_NAME_push(ca_sk,xn))
1287                         {
1288                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1289                         goto err;
1290                         }
1291
1292                 p+=l;
1293                 nc+=l+2;
1294                 }
1295
1296         if (0)
1297                 {
1298 cont:
1299                 ERR_clear_error();
1300                 }
1301
1302         /* we should setup a certificate to return.... */
1303         s->s3->tmp.cert_req=1;
1304         s->s3->tmp.ctype_num=ctype_num;
1305         if (s->s3->tmp.ca_names != NULL)
1306                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1307         s->s3->tmp.ca_names=ca_sk;
1308         ca_sk=NULL;
1309
1310         ret=1;
1311 err:
1312         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1313         return(ret);
1314         }
1315
1316 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1317         {
1318         return(X509_NAME_cmp(*a,*b));
1319         }
1320
1321 static int ssl3_get_server_done(SSL *s)
1322         {
1323         int ok,ret=0;
1324         long n;
1325
1326         n=ssl3_get_message(s,
1327                 SSL3_ST_CR_SRVR_DONE_A,
1328                 SSL3_ST_CR_SRVR_DONE_B,
1329                 SSL3_MT_SERVER_DONE,
1330                 30, /* should be very small, like 0 :-) */
1331                 &ok);
1332
1333         if (!ok) return((int)n);
1334         if (n > 0)
1335                 {
1336                 /* should contain no data */
1337                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1338                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1339                 }
1340         ret=1;
1341         return(ret);
1342         }
1343
1344 static int ssl3_send_client_key_exchange(SSL *s)
1345         {
1346         unsigned char *p,*d;
1347         int n;
1348         unsigned long l;
1349 #ifndef OPENSSL_NO_RSA
1350         unsigned char *q;
1351         EVP_PKEY *pkey=NULL;
1352 #endif
1353 #ifndef OPENSSL_NO_KRB5
1354         KSSL_ERR kssl_err;
1355 #endif /* OPENSSL_NO_KRB5 */
1356
1357         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1358                 {
1359                 d=(unsigned char *)s->init_buf->data;
1360                 p= &(d[4]);
1361
1362                 l=s->s3->tmp.new_cipher->algorithms;
1363
1364                 /* Fool emacs indentation */
1365                 if (0) {}
1366 #ifndef OPENSSL_NO_RSA
1367                 else if (l & SSL_kRSA)
1368                         {
1369                         RSA *rsa;
1370                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1371
1372                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1373                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1374                         else
1375                                 {
1376                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1377                                 if ((pkey == NULL) ||
1378                                         (pkey->type != EVP_PKEY_RSA) ||
1379                                         (pkey->pkey.rsa == NULL))
1380                                         {
1381                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1382                                         goto err;
1383                                         }
1384                                 rsa=pkey->pkey.rsa;
1385                                 EVP_PKEY_free(pkey);
1386                                 }
1387
1388                         tmp_buf[0]=s->client_version>>8;
1389                         tmp_buf[1]=s->client_version&0xff;
1390                         if (RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2) <= 0)
1391                                         goto err;
1392
1393                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1394
1395                         q=p;
1396                         /* Fix buf for TLS and beyond */
1397                         if (s->version > SSL3_VERSION)
1398                                 p+=2;
1399                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1400                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1401 #ifdef PKCS1_CHECK
1402                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1403                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1404 #endif
1405                         if (n <= 0)
1406                                 {
1407                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1408                                 goto err;
1409                                 }
1410
1411                         /* Fix buf for TLS and beyond */
1412                         if (s->version > SSL3_VERSION)
1413                                 {
1414                                 s2n(n,q);
1415                                 n+=2;
1416                                 }
1417
1418                         s->session->master_key_length=
1419                                 s->method->ssl3_enc->generate_master_secret(s,
1420                                         s->session->master_key,
1421                                         tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1422                         memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1423                         }
1424 #endif
1425 #ifndef OPENSSL_NO_KRB5
1426                 else if (l & SSL_kKRB5)
1427                         {
1428                         krb5_error_code krb5rc;
1429                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1430                         krb5_data       krb5_ap_req;
1431
1432 #ifdef KSSL_DEBUG
1433                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1434                                 l, SSL_kKRB5);
1435 #endif  /* KSSL_DEBUG */
1436
1437                         /*
1438                         **      Tried to send random tmp_buf[] as PMS in Kerberos ticket
1439                         **      by passing  krb5_mk_req_extended(ctx,authctx,opts, tmp_buf, ...)
1440                         **      but: I can't retrieve the PMS on the other side!  There is
1441                         **      some indication in the krb5 source that this is only used
1442                         **      to generate a checksum.  OTOH, the Tung book shows data
1443                         **      ("GET widget01.txt") being passed in krb5_mk_req_extended()
1444                         **      by way of krb5_sendauth().  I don't get it.
1445                         **      Until Kerberos goes 3DES, the big PMS secret would only be
1446                         **      encrypted in 1-DES anyway.  So losing the PMS shouldn't be
1447                         **      a big deal.
1448                         */
1449                         krb5rc = kssl_cget_tkt(kssl_ctx, &krb5_ap_req,
1450                                 &kssl_err);
1451 #ifdef KSSL_DEBUG
1452                         {
1453                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1454                         kssl_ctx_show(kssl_ctx);
1455                         if (krb5rc && kssl_err.text)
1456                                 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1457                         }
1458 #endif  /* KSSL_DEBUG */
1459
1460                         if (krb5rc)
1461                                 {
1462                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1463                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
1464                                 goto err;
1465                                 }
1466
1467                         /*      Send ticket (copy to *p, set n = length)
1468                          */
1469                         n = krb5_ap_req.length;
1470                         memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1471                         if (krb5_ap_req.data)
1472                                 kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1473
1474                         /*      19991013 VRS -  3DES is kind of bogus here,
1475                         **      at least until Kerberos supports 3DES.  The only
1476                         **      real secret is the 8-byte Kerberos session key;
1477                         **      the other key material ((s->) client_random, server_random)
1478                         **      could be sniffed.  Mixing in these nonces should help
1479                         **      protect against replay attacks, however.
1480                         **
1481                         **      Alternate code for Kerberos Purists:
1482                         **
1483                         **      memcpy(s->session->master_key, kssl_ctx->key, kssl_ctx->length);
1484                         **      s->session->master_key_length = kssl_ctx->length;
1485                         */
1486                         s->session->master_key_length=
1487                                 s->method->ssl3_enc->generate_master_secret(s,
1488                                         s->session->master_key, kssl_ctx->key,kssl_ctx->length);
1489                         }
1490 #endif
1491 #ifndef OPENSSL_NO_DH
1492                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1493                         {
1494                         DH *dh_srvr,*dh_clnt;
1495
1496                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1497                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1498                         else
1499                                 {
1500                                 /* we get them from the cert */
1501                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1502                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1503                                 goto err;
1504                                 }
1505
1506                         /* generate a new random key */
1507                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1508                                 {
1509                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1510                                 goto err;
1511                                 }
1512                         if (!DH_generate_key(dh_clnt))
1513                                 {
1514                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1515                                 goto err;
1516                                 }
1517
1518                         /* use the 'p' output buffer for the DH key, but
1519                          * make sure to clear it out afterwards */
1520
1521                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1522
1523                         if (n <= 0)
1524                                 {
1525                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1526                                 goto err;
1527                                 }
1528
1529                         /* generate master key from the result */
1530                         s->session->master_key_length=
1531                                 s->method->ssl3_enc->generate_master_secret(s,
1532                                         s->session->master_key,p,n);
1533                         /* clean up */
1534                         memset(p,0,n);
1535
1536                         /* send off the data */
1537                         n=BN_num_bytes(dh_clnt->pub_key);
1538                         s2n(n,p);
1539                         BN_bn2bin(dh_clnt->pub_key,p);
1540                         n+=2;
1541
1542                         DH_free(dh_clnt);
1543
1544                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1545                         }
1546 #endif
1547                 else
1548                         {
1549                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1550                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1551                         goto err;
1552                         }
1553
1554                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1555                 l2n3(n,d);
1556
1557                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1558                 /* number of bytes to write */
1559                 s->init_num=n+4;
1560                 s->init_off=0;
1561                 }
1562
1563         /* SSL3_ST_CW_KEY_EXCH_B */
1564         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1565 err:
1566         return(-1);
1567         }
1568
1569 static int ssl3_send_client_verify(SSL *s)
1570         {
1571         unsigned char *p,*d;
1572         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1573         EVP_PKEY *pkey;
1574 #ifndef OPENSSL_NO_RSA
1575         unsigned u=0;
1576 #endif
1577         unsigned long n;
1578 #ifndef OPENSSL_NO_DSA
1579         int j;
1580 #endif
1581
1582         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1583                 {
1584                 d=(unsigned char *)s->init_buf->data;
1585                 p= &(d[4]);
1586                 pkey=s->cert->key->privatekey;
1587
1588                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1589                         &(data[MD5_DIGEST_LENGTH]));
1590
1591 #ifndef OPENSSL_NO_RSA
1592                 if (pkey->type == EVP_PKEY_RSA)
1593                         {
1594                         s->method->ssl3_enc->cert_verify_mac(s,
1595                                 &(s->s3->finish_dgst1),&(data[0]));
1596                         if (RSA_sign(NID_md5_sha1, data,
1597                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1598                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1599                                 {
1600                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1601                                 goto err;
1602                                 }
1603                         s2n(u,p);
1604                         n=u+2;
1605                         }
1606                 else
1607 #endif
1608 #ifndef OPENSSL_NO_DSA
1609                         if (pkey->type == EVP_PKEY_DSA)
1610                         {
1611                         if (!DSA_sign(pkey->save_type,
1612                                 &(data[MD5_DIGEST_LENGTH]),
1613                                 SHA_DIGEST_LENGTH,&(p[2]),
1614                                 (unsigned int *)&j,pkey->pkey.dsa))
1615                                 {
1616                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1617                                 goto err;
1618                                 }
1619                         s2n(j,p);
1620                         n=j+2;
1621                         }
1622                 else
1623 #endif
1624                         {
1625                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1626                         goto err;
1627                         }
1628                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1629                 l2n3(n,d);
1630
1631                 s->init_num=(int)n+4;
1632                 s->init_off=0;
1633                 }
1634         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1635 err:
1636         return(-1);
1637         }
1638
1639 static int ssl3_send_client_certificate(SSL *s)
1640         {
1641         X509 *x509=NULL;
1642         EVP_PKEY *pkey=NULL;
1643         int i;
1644         unsigned long l;
1645
1646         if (s->state == SSL3_ST_CW_CERT_A)
1647                 {
1648                 if ((s->cert == NULL) ||
1649                         (s->cert->key->x509 == NULL) ||
1650                         (s->cert->key->privatekey == NULL))
1651                         s->state=SSL3_ST_CW_CERT_B;
1652                 else
1653                         s->state=SSL3_ST_CW_CERT_C;
1654                 }
1655
1656         /* We need to get a client cert */
1657         if (s->state == SSL3_ST_CW_CERT_B)
1658                 {
1659                 /* If we get an error, we need to
1660                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1661                  * We then get retied later */
1662                 i=0;
1663                 if (s->ctx->client_cert_cb != NULL)
1664                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1665                 if (i < 0)
1666                         {
1667                         s->rwstate=SSL_X509_LOOKUP;
1668                         return(-1);
1669                         }
1670                 s->rwstate=SSL_NOTHING;
1671                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1672                         {
1673                         s->state=SSL3_ST_CW_CERT_B;
1674                         if (    !SSL_use_certificate(s,x509) ||
1675                                 !SSL_use_PrivateKey(s,pkey))
1676                                 i=0;
1677                         }
1678                 else if (i == 1)
1679                         {
1680                         i=0;
1681                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1682                         }
1683
1684                 if (x509 != NULL) X509_free(x509);
1685                 if (pkey != NULL) EVP_PKEY_free(pkey);
1686                 if (i == 0)
1687                         {
1688                         if (s->version == SSL3_VERSION)
1689                                 {
1690                                 s->s3->tmp.cert_req=0;
1691                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1692                                 return(1);
1693                                 }
1694                         else
1695                                 {
1696                                 s->s3->tmp.cert_req=2;
1697                                 }
1698                         }
1699
1700                 /* Ok, we have a cert */
1701                 s->state=SSL3_ST_CW_CERT_C;
1702                 }
1703
1704         if (s->state == SSL3_ST_CW_CERT_C)
1705                 {
1706                 s->state=SSL3_ST_CW_CERT_D;
1707                 l=ssl3_output_cert_chain(s,
1708                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1709                 s->init_num=(int)l;
1710                 s->init_off=0;
1711                 }
1712         /* SSL3_ST_CW_CERT_D */
1713         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1714         }
1715
1716 #define has_bits(i,m)   (((i)&(m)) == (m))
1717
1718 static int ssl3_check_cert_and_algorithm(SSL *s)
1719         {
1720         int i,idx;
1721         long algs;
1722         EVP_PKEY *pkey=NULL;
1723         SESS_CERT *sc;
1724 #ifndef OPENSSL_NO_RSA
1725         RSA *rsa;
1726 #endif
1727 #ifndef OPENSSL_NO_DH
1728         DH *dh;
1729 #endif
1730
1731         sc=s->session->sess_cert;
1732
1733         if (sc == NULL)
1734                 {
1735                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
1736                 goto err;
1737                 }
1738
1739         algs=s->s3->tmp.new_cipher->algorithms;
1740
1741         /* we don't have a certificate */
1742         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
1743                 return(1);
1744
1745 #ifndef OPENSSL_NO_RSA
1746         rsa=s->session->sess_cert->peer_rsa_tmp;
1747 #endif
1748 #ifndef OPENSSL_NO_DH
1749         dh=s->session->sess_cert->peer_dh_tmp;
1750 #endif
1751
1752         /* This is the passed certificate */
1753
1754         idx=sc->peer_cert_type;
1755         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1756         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1757         EVP_PKEY_free(pkey);
1758
1759
1760         /* Check that we have a certificate if we require one */
1761         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1762                 {
1763                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1764                 goto f_err;
1765                 }
1766 #ifndef OPENSSL_NO_DSA
1767         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1768                 {
1769                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1770                 goto f_err;
1771                 }
1772 #endif
1773 #ifndef OPENSSL_NO_RSA
1774         if ((algs & SSL_kRSA) &&
1775                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1776                 {
1777                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1778                 goto f_err;
1779                 }
1780 #endif
1781 #ifndef OPENSSL_NO_DH
1782         if ((algs & SSL_kEDH) &&
1783                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1784                 {
1785                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1786                 goto f_err;
1787                 }
1788         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1789                 {
1790                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1791                 goto f_err;
1792                 }
1793 #ifndef OPENSSL_NO_DSA
1794         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1795                 {
1796                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1797                 goto f_err;
1798                 }
1799 #endif
1800 #endif
1801
1802         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
1803                 {
1804 #ifndef OPENSSL_NO_RSA
1805                 if (algs & SSL_kRSA)
1806                         {
1807                         if (rsa == NULL
1808                             || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1809                                 {
1810                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1811                                 goto f_err;
1812                                 }
1813                         }
1814                 else
1815 #endif
1816 #ifndef OPENSSL_NO_DH
1817                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1818                             {
1819                             if (dh == NULL
1820                                 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1821                                 {
1822                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1823                                 goto f_err;
1824                                 }
1825                         }
1826                 else
1827 #endif
1828                         {
1829                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1830                         goto f_err;
1831                         }
1832                 }
1833         return(1);
1834 f_err:
1835         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1836 err:
1837         return(0);
1838         }
1839