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/md5.h>
  64 #include <openssl/sha.h>
  65 #include <openssl/evp.h>
  66 #include "ssl_locl.h"
  67
  68 #ifndef OPENSSL_NO_KRB5
  69 #include "kssl.h"
  70 #endif
  71
  72 static SSL_METHOD *ssl3_get_client_method(int ver);
  73 static int ssl3_client_hello(SSL *s);
  74 static int ssl3_get_server_hello(SSL *s);
  75 static int ssl3_get_certificate_request(SSL *s);
  76 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
  77 static int ssl3_get_server_done(SSL *s);
  78 static int ssl3_send_client_verify(SSL *s);
  79 static int ssl3_send_client_certificate(SSL *s);
  80 static int ssl3_send_client_key_exchange(SSL *s);
  81 static int ssl3_get_key_exchange(SSL *s);
  82 static int ssl3_get_server_certificate(SSL *s);
  83 static int ssl3_check_cert_and_algorithm(SSL *s);
  84 static SSL_METHOD *ssl3_get_client_method(int ver)
  85         {
  86         if (ver == SSL3_VERSION)
  87                 return(SSLv3_client_method());
  88         else
  89                 return(NULL);
  90         }
  91
  92 SSL_METHOD *SSLv3_client_method(void)
  93         {
  94         static int init=1;
  95         static SSL_METHOD SSLv3_client_data;
  96
  97         if (init)
  98                 {
  99                 init=0;
 100                 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
 101                         sizeof(SSL_METHOD));
 102                 SSLv3_client_data.ssl_connect=ssl3_connect;
 103                 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
 104                 }
 105         return(&SSLv3_client_data);
 106         }
 107
 108 int ssl3_connect(SSL *s)
 109         {
 110         BUF_MEM *buf;
 111         unsigned long Time=time(NULL),l;
 112         long num1;
 113         void (*cb)()=NULL;
 114         int ret= -1;
 115         int new_state,state,skip=0;;
 116
 117         RAND_add(&Time,sizeof(Time),0);
 118         ERR_clear_error();
 119         clear_sys_error();
 120
 121         if (s->info_callback != NULL)
 122                 cb=s->info_callback;
 123         else if (s->ctx->info_callback != NULL)
 124                 cb=s->ctx->info_callback;
 125
 126         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 127         s->in_handshake++;
 128
 129         for (;;)
 130                 {
 131                 state=s->state;
 132
 133                 switch(s->state)
 134                         {
 135                 case SSL_ST_RENEGOTIATE:
 136                         s->new_session=1;
 137                         s->state=SSL_ST_CONNECT;
 138                         s->ctx->stats.sess_connect_renegotiate++;
 139                         /* break */
 140                 case SSL_ST_BEFORE:
 141                 case SSL_ST_CONNECT:
 142                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 143                 case SSL_ST_OK|SSL_ST_CONNECT:
 144
 145                         s->server=0;
 146                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 147
 148                         if ((s->version & 0xff00 ) != 0x0300)
 149                                 {
 150                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 151                                 ret = -1;
 152                                 goto end;
 153                                 }
 154
 155                         /* s->version=SSL3_VERSION; */
 156                         s->type=SSL_ST_CONNECT;
 157
 158                         if (s->init_buf == NULL)
 159                                 {
 160                                 if ((buf=BUF_MEM_new()) == NULL)
 161                                         {
 162                                         ret= -1;
 163                                         goto end;
 164                                         }
 165                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 166                                         {
 167                                         ret= -1;
 168                                         goto end;
 169                                         }
 170                                 s->init_buf=buf;
 171                                 }
 172
 173                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 174
 175                         /* setup buffing BIO */
 176                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 177
 178                         /* don't push the buffering BIO quite yet */
 179
 180                         ssl3_init_finished_mac(s);
 181
 182                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 183                         s->ctx->stats.sess_connect++;
 184                         s->init_num=0;
 185                         break;
 186
 187                 case SSL3_ST_CW_CLNT_HELLO_A:
 188                 case SSL3_ST_CW_CLNT_HELLO_B:
 189
 190                         s->shutdown=0;
 191                         ret=ssl3_client_hello(s);
 192                         if (ret <= 0) goto end;
 193                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 194                         s->init_num=0;
 195
 196                         /* turn on buffering for the next lot of output */
 197                         if (s->bbio != s->wbio)
 198                                 s->wbio=BIO_push(s->bbio,s->wbio);
 199
 200                         break;
 201
 202                 case SSL3_ST_CR_SRVR_HELLO_A:
 203                 case SSL3_ST_CR_SRVR_HELLO_B:
 204                         ret=ssl3_get_server_hello(s);
 205                         if (ret <= 0) goto end;
 206                         if (s->hit)
 207                                 s->state=SSL3_ST_CR_FINISHED_A;
 208                         else
 209                                 s->state=SSL3_ST_CR_CERT_A;
 210                         s->init_num=0;
 211                         break;
 212
 213                 case SSL3_ST_CR_CERT_A:
 214                 case SSL3_ST_CR_CERT_B:
 215                         /* Check if it is anon DH */
 216                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 217                                 {
 218                                 ret=ssl3_get_server_certificate(s);
 219                                 if (ret <= 0) goto end;
 220                                 }
 221                         else
 222                                 skip=1;
 223                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 224                         s->init_num=0;
 225                         break;
 226
 227                 case SSL3_ST_CR_KEY_EXCH_A:
 228                 case SSL3_ST_CR_KEY_EXCH_B:
 229                         ret=ssl3_get_key_exchange(s);
 230                         if (ret <= 0) goto end;
 231                         s->state=SSL3_ST_CR_CERT_REQ_A;
 232                         s->init_num=0;
 233
 234                         /* at this point we check that we have the
 235                          * required stuff from the server */
 236                         if (!ssl3_check_cert_and_algorithm(s))
 237                                 {
 238                                 ret= -1;
 239                                 goto end;
 240                                 }
 241                         break;
 242
 243                 case SSL3_ST_CR_CERT_REQ_A:
 244                 case SSL3_ST_CR_CERT_REQ_B:
 245                         ret=ssl3_get_certificate_request(s);
 246                         if (ret <= 0) goto end;
 247                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 248                         s->init_num=0;
 249                         break;
 250
 251                 case SSL3_ST_CR_SRVR_DONE_A:
 252                 case SSL3_ST_CR_SRVR_DONE_B:
 253                         ret=ssl3_get_server_done(s);
 254                         if (ret <= 0) goto end;
 255                         if (s->s3->tmp.cert_req)
 256                                 s->state=SSL3_ST_CW_CERT_A;
 257                         else
 258                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 259                         s->init_num=0;
 260
 261                         break;
 262
 263                 case SSL3_ST_CW_CERT_A:
 264                 case SSL3_ST_CW_CERT_B:
 265                 case SSL3_ST_CW_CERT_C:
 266                 case SSL3_ST_CW_CERT_D:
 267                         ret=ssl3_send_client_certificate(s);
 268                         if (ret <= 0) goto end;
 269                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 270                         s->init_num=0;
 271                         break;
 272
 273                 case SSL3_ST_CW_KEY_EXCH_A:
 274                 case SSL3_ST_CW_KEY_EXCH_B:
 275                         ret=ssl3_send_client_key_exchange(s);
 276                         if (ret <= 0) goto end;
 277                         l=s->s3->tmp.new_cipher->algorithms;
 278                         /* EAY EAY EAY need to check for DH fix cert
 279                          * sent back */
 280                         /* For TLS, cert_req is set to 2, so a cert chain
 281                          * of nothing is sent, but no verify packet is sent */
 282                         if (s->s3->tmp.cert_req == 1)
 283                                 {
 284                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 285                                 }
 286                         else
 287                                 {
 288                                 s->state=SSL3_ST_CW_CHANGE_A;
 289                                 s->s3->change_cipher_spec=0;
 290                                 }
 291
 292                         s->init_num=0;
 293                         break;
 294
 295                 case SSL3_ST_CW_CERT_VRFY_A:
 296                 case SSL3_ST_CW_CERT_VRFY_B:
 297                         ret=ssl3_send_client_verify(s);
 298                         if (ret <= 0) goto end;
 299                         s->state=SSL3_ST_CW_CHANGE_A;
 300                         s->init_num=0;
 301                         s->s3->change_cipher_spec=0;
 302                         break;
 303
 304                 case SSL3_ST_CW_CHANGE_A:
 305                 case SSL3_ST_CW_CHANGE_B:
 306                         ret=ssl3_send_change_cipher_spec(s,
 307                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 308                         if (ret <= 0) goto end;
 309                         s->state=SSL3_ST_CW_FINISHED_A;
 310                         s->init_num=0;
 311
 312                         s->session->cipher=s->s3->tmp.new_cipher;
 313                         if (s->s3->tmp.new_compression == NULL)
 314                                 s->session->compress_meth=0;
 315                         else
 316                                 s->session->compress_meth=
 317                                         s->s3->tmp.new_compression->id;
 318                         if (!s->method->ssl3_enc->setup_key_block(s))
 319                                 {
 320                                 ret= -1;
 321                                 goto end;
 322                                 }
 323
 324                         if (!s->method->ssl3_enc->change_cipher_state(s,
 325                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 326                                 {
 327                                 ret= -1;
 328                                 goto end;
 329                                 }
 330
 331                         break;
 332
 333                 case SSL3_ST_CW_FINISHED_A:
 334                 case SSL3_ST_CW_FINISHED_B:
 335                         ret=ssl3_send_finished(s,
 336                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 337                                 s->method->ssl3_enc->client_finished_label,
 338                                 s->method->ssl3_enc->client_finished_label_len);
 339                         if (ret <= 0) goto end;
 340                         s->state=SSL3_ST_CW_FLUSH;
 341
 342                         /* clear flags */
 343                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 344                         if (s->hit)
 345                                 {
 346                                 s->s3->tmp.next_state=SSL_ST_OK;
 347                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 348                                         {
 349                                         s->state=SSL_ST_OK;
 350                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 351                                         s->s3->delay_buf_pop_ret=0;
 352                                         }
 353                                 }
 354                         else
 355                                 {
 356                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 357                                 }
 358                         s->init_num=0;
 359                         break;
 360
 361                 case SSL3_ST_CR_FINISHED_A:
 362                 case SSL3_ST_CR_FINISHED_B:
 363
 364                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 365                                 SSL3_ST_CR_FINISHED_B);
 366                         if (ret <= 0) goto end;
 367
 368                         if (s->hit)
 369                                 s->state=SSL3_ST_CW_CHANGE_A;
 370                         else
 371                                 s->state=SSL_ST_OK;
 372                         s->init_num=0;
 373                         break;
 374
 375                 case SSL3_ST_CW_FLUSH:
 376                         /* number of bytes to be flushed */
 377                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 378                         if (num1 > 0)
 379                                 {
 380                                 s->rwstate=SSL_WRITING;
 381                                 num1=BIO_flush(s->wbio);
 382                                 if (num1 <= 0) { ret= -1; goto end; }
 383                                 s->rwstate=SSL_NOTHING;
 384                                 }
 385
 386                         s->state=s->s3->tmp.next_state;
 387                         break;
 388
 389                 case SSL_ST_OK:
 390                         /* clean a few things up */
 391                         ssl3_cleanup_key_block(s);
 392
 393                         if (s->init_buf != NULL)
 394                                 {
 395                                 BUF_MEM_free(s->init_buf);
 396                                 s->init_buf=NULL;
 397                                 }
 398
 399                         /* If we are not 'joining' the last two packets,
 400                          * remove the buffering now */
 401                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 402                                 ssl_free_wbio_buffer(s);
 403                         /* else do it later in ssl3_write */
 404
 405                         s->init_num=0;
 406                         s->new_session=0;
 407
 408                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 409                         if (s->hit) s->ctx->stats.sess_hit++;
 410
 411                         ret=1;
 412                         /* s->server=0; */
 413                         s->handshake_func=ssl3_connect;
 414                         s->ctx->stats.sess_connect_good++;
 415
 416                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 417
 418                         goto end;
 419                         /* break; */
 420
 421                 default:
 422                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 423                         ret= -1;
 424                         goto end;
 425                         /* break; */
 426                         }
 427
 428                 /* did we do anything */
 429                 if (!s->s3->tmp.reuse_message && !skip)
 430                         {
 431                         if (s->debug)
 432                                 {
 433                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 434                                         goto end;
 435                                 }
 436
 437                         if ((cb != NULL) && (s->state != state))
 438                                 {
 439                                 new_state=s->state;
 440                                 s->state=state;
 441                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 442                                 s->state=new_state;
 443                                 }
 444                         }
 445                 skip=0;
 446                 }
 447 end:
 448         if (cb != NULL)
 449                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 450         s->in_handshake--;
 451         return(ret);
 452         }
 453
 454
 455 static int ssl3_client_hello(SSL *s)
 456         {
 457         unsigned char *buf;
 458         unsigned char *p,*d;
 459         int i,j;
 460         unsigned long Time,l;
 461         SSL_COMP *comp;
 462
 463         buf=(unsigned char *)s->init_buf->data;
 464         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 465                 {
 466                 if ((s->session == NULL) ||
 467                         (s->session->ssl_version != s->version) ||
 468                         (s->session->not_resumable))
 469                         {
 470                         if (!ssl_get_new_session(s,0))
 471                                 goto err;
 472                         }
 473                 /* else use the pre-loaded session */
 474
 475                 p=s->s3->client_random;
 476                 Time=time(NULL);                        /* Time */
 477                 l2n(Time,p);
 478                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 479
 480                 /* Do the message type and length last */
 481                 d=p= &(buf[4]);
 482
 483                 *(p++)=s->version>>8;
 484                 *(p++)=s->version&0xff;
 485                 s->client_version=s->version;
 486
 487                 /* Random stuff */
 488                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 489                 p+=SSL3_RANDOM_SIZE;
 490
 491                 /* Session ID */
 492                 if (s->new_session)
 493                         i=0;
 494                 else
 495                         i=s->session->session_id_length;
 496                 *(p++)=i;
 497                 if (i != 0)
 498                         {
 499                         memcpy(p,s->session->session_id,i);
 500                         p+=i;
 501                         }
 502
 503                 /* Ciphers supported */
 504                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 505                 if (i == 0)
 506                         {
 507                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 508                         goto err;
 509                         }
 510                 s2n(i,p);
 511                 p+=i;
 512
 513                 /* COMPRESSION */
 514                 if (s->ctx->comp_methods == NULL)
 515                         j=0;
 516                 else
 517                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 518                 *(p++)=1+j;
 519                 for (i=0; i<j; i++)
 520                         {
 521                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 522                         *(p++)=comp->id;
 523                         }
 524                 *(p++)=0; /* Add the NULL method */
 525
 526                 l=(p-d);
 527                 d=buf;
 528                 *(d++)=SSL3_MT_CLIENT_HELLO;
 529                 l2n3(l,d);
 530
 531                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 532                 /* number of bytes to write */
 533                 s->init_num=p-buf;
 534                 s->init_off=0;
 535                 }
 536
 537         /* SSL3_ST_CW_CLNT_HELLO_B */
 538         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 539 err:
 540         return(-1);
 541         }
 542
 543 static int ssl3_get_server_hello(SSL *s)
 544         {
 545         STACK_OF(SSL_CIPHER) *sk;
 546         SSL_CIPHER *c;
 547         unsigned char *p,*d;
 548         int i,al,ok;
 549         unsigned int j;
 550         long n;
 551         SSL_COMP *comp;
 552
 553         n=ssl3_get_message(s,
 554                 SSL3_ST_CR_SRVR_HELLO_A,
 555                 SSL3_ST_CR_SRVR_HELLO_B,
 556                 SSL3_MT_SERVER_HELLO,
 557                 300, /* ?? */
 558                 &ok);
 559
 560         if (!ok) return((int)n);
 561         d=p=(unsigned char *)s->init_buf->data;
 562
 563         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 564                 {
 565                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 566                 s->version=(s->version&0xff00)|p[1];
 567                 al=SSL_AD_PROTOCOL_VERSION;
 568                 goto f_err;
 569                 }
 570         p+=2;
 571
 572         /* load the server hello data */
 573         /* load the server random */
 574         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 575         p+=SSL3_RANDOM_SIZE;
 576
 577         /* get the session-id */
 578         j= *(p++);
 579
 580         if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
 581                 {
 582                 /* SSLref returns 16 :-( */
 583                 if (j < SSL2_SSL_SESSION_ID_LENGTH)
 584                         {
 585                         al=SSL_AD_ILLEGAL_PARAMETER;
 586                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
 587                         goto f_err;
 588                         }
 589                 }
 590         if (j != 0 && j == s->session->session_id_length
 591             && memcmp(p,s->session->session_id,j) == 0)
 592             {
 593             if(s->sid_ctx_length != s->session->sid_ctx_length
 594                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 595                 {
 596                 al=SSL_AD_ILLEGAL_PARAMETER;
 597                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 598                 goto f_err;
 599                 }
 600             s->hit=1;
 601             }
 602         else    /* a miss or crap from the other end */
 603                 {
 604                 /* If we were trying for session-id reuse, make a new
 605                  * SSL_SESSION so we don't stuff up other people */
 606                 s->hit=0;
 607                 if (s->session->session_id_length > 0)
 608                         {
 609                         if (!ssl_get_new_session(s,0))
 610                                 {
 611                                 al=SSL_AD_INTERNAL_ERROR;
 612                                 goto f_err;
 613                                 }
 614                         }
 615                 s->session->session_id_length=j;
 616                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 617                 }
 618         p+=j;
 619         c=ssl_get_cipher_by_char(s,p);
 620         if (c == NULL)
 621                 {
 622                 /* unknown cipher */
 623                 al=SSL_AD_ILLEGAL_PARAMETER;
 624                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 625                 goto f_err;
 626                 }
 627         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 628
 629         sk=ssl_get_ciphers_by_id(s);
 630         i=sk_SSL_CIPHER_find(sk,c);
 631         if (i < 0)
 632                 {
 633                 /* we did not say we would use this cipher */
 634                 al=SSL_AD_ILLEGAL_PARAMETER;
 635                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 636                 goto f_err;
 637                 }
 638
 639         if (s->hit && (s->session->cipher != c))
 640                 {
 641                 if (!(s->options &
 642                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 643                         {
 644                         al=SSL_AD_ILLEGAL_PARAMETER;
 645                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 646                         goto f_err;
 647                         }
 648                 }
 649         s->s3->tmp.new_cipher=c;
 650
 651         /* lets get the compression algorithm */
 652         /* COMPRESSION */
 653         j= *(p++);
 654         if (j == 0)
 655                 comp=NULL;
 656         else
 657                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 658
 659         if ((j != 0) && (comp == NULL))
 660                 {
 661                 al=SSL_AD_ILLEGAL_PARAMETER;
 662                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 663                 goto f_err;
 664                 }
 665         else
 666                 {
 667                 s->s3->tmp.new_compression=comp;
 668                 }
 669
 670         if (p != (d+n))
 671                 {
 672                 /* wrong packet length */
 673                 al=SSL_AD_DECODE_ERROR;
 674                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 675                 goto err;
 676                 }
 677
 678         return(1);
 679 f_err:
 680         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 681 err:
 682         return(-1);
 683         }
 684
 685 static int ssl3_get_server_certificate(SSL *s)
 686         {
 687         int al,i,ok,ret= -1;
 688         unsigned long n,nc,llen,l;
 689         X509 *x=NULL;
 690         unsigned char *p,*d,*q;
 691         STACK_OF(X509) *sk=NULL;
 692         SESS_CERT *sc;
 693         EVP_PKEY *pkey=NULL;
 694         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 695
 696         n=ssl3_get_message(s,
 697                 SSL3_ST_CR_CERT_A,
 698                 SSL3_ST_CR_CERT_B,
 699                 -1,
 700 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN32)
 701                 1024*30, /* 30k max cert list :-) */
 702 #else
 703                 1024*100, /* 100k max cert list :-) */
 704 #endif
 705                 &ok);
 706
 707         if (!ok) return((int)n);
 708
 709         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 710                 {
 711                 s->s3->tmp.reuse_message=1;
 712                 return(1);
 713                 }
 714
 715         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 716                 {
 717                 al=SSL_AD_UNEXPECTED_MESSAGE;
 718                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 719                 goto f_err;
 720                 }
 721         d=p=(unsigned char *)s->init_buf->data;
 722
 723         if ((sk=sk_X509_new_null()) == NULL)
 724                 {
 725                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 726                 goto err;
 727                 }
 728
 729         n2l3(p,llen);
 730         if (llen+3 != n)
 731                 {
 732                 al=SSL_AD_DECODE_ERROR;
 733                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 734                 goto f_err;
 735                 }
 736         for (nc=0; nc<llen; )
 737                 {
 738                 n2l3(p,l);
 739                 if ((l+nc+3) > llen)
 740                         {
 741                         al=SSL_AD_DECODE_ERROR;
 742                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 743                         goto f_err;
 744                         }
 745
 746                 q=p;
 747                 x=d2i_X509(NULL,&q,l);
 748                 if (x == NULL)
 749                         {
 750                         al=SSL_AD_BAD_CERTIFICATE;
 751                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 752                         goto f_err;
 753                         }
 754                 if (q != (p+l))
 755                         {
 756                         al=SSL_AD_DECODE_ERROR;
 757                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 758                         goto f_err;
 759                         }
 760                 if (!sk_X509_push(sk,x))
 761                         {
 762                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 763                         goto err;
 764                         }
 765                 x=NULL;
 766                 nc+=l+3;
 767                 p=q;
 768                 }
 769
 770         i=ssl_verify_cert_chain(s,sk);
 771         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 772                 {
 773                 al=ssl_verify_alarm_type(s->verify_result);
 774                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 775                 goto f_err;
 776                 }
 777         ERR_clear_error(); /* but we keep s->verify_result */
 778
 779         sc=ssl_sess_cert_new();
 780         if (sc == NULL) goto err;
 781
 782         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 783         s->session->sess_cert=sc;
 784
 785         sc->cert_chain=sk;
 786         /* Inconsistency alert: cert_chain does include the peer's
 787          * certificate, which we don't include in s3_srvr.c */
 788         x=sk_X509_value(sk,0);
 789         sk=NULL;
 790         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end */
 791
 792         pkey=X509_get_pubkey(x);
 793
 794         /* VRS: allow null cert if auth == KRB5 */
 795         need_cert =
 796                 ((s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 797                         == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
 798
 799 #ifdef KSSL_DEBUG
 800         printf("pkey,x = %p, %p\n", pkey,x);
 801         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
 802         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
 803                 s->s3->tmp.new_cipher->algorithms, need_cert);
 804 #endif    /* KSSL_DEBUG */
 805
 806         if (need_cert  &&  ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
 807                 {
 808                 x=NULL;
 809                 al=SSL3_AL_FATAL;
 810                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 811                 goto f_err;
 812                 }
 813
 814         i=ssl_cert_type(x,pkey);
 815         if (need_cert && i < 0)
 816                 {
 817                 x=NULL;
 818                 al=SSL3_AL_FATAL;
 819                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 820                 goto f_err;
 821                 }
 822
 823         if (need_cert)
 824                 {
 825                 sc->peer_cert_type=i;
 826                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 827                 /* Why would the following ever happen?
 828                  * We just created sc a couple of lines ago. */
 829                 if (sc->peer_pkeys[i].x509 != NULL)
 830                         X509_free(sc->peer_pkeys[i].x509);
 831                 sc->peer_pkeys[i].x509=x;
 832                 sc->peer_key= &(sc->peer_pkeys[i]);
 833
 834                 if (s->session->peer != NULL)
 835                         X509_free(s->session->peer);
 836                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 837                 s->session->peer=x;
 838                 }
 839         else
 840                 {
 841                 sc->peer_cert_type=i;
 842                 sc->peer_key= NULL;
 843
 844                 if (s->session->peer != NULL)
 845                         X509_free(s->session->peer);
 846                 s->session->peer=NULL;
 847                 }
 848         s->session->verify_result = s->verify_result;
 849
 850         x=NULL;
 851         ret=1;
 852
 853         if (0)
 854                 {
 855 f_err:
 856                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 857                 }
 858 err:
 859         EVP_PKEY_free(pkey);
 860         X509_free(x);
 861         sk_X509_pop_free(sk,X509_free);
 862         return(ret);
 863         }
 864
 865 static int ssl3_get_key_exchange(SSL *s)
 866         {
 867 #ifndef OPENSSL_NO_RSA
 868         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 869 #endif
 870         EVP_MD_CTX md_ctx;
 871         unsigned char *param,*p;
 872         int al,i,j,param_len,ok;
 873         long n,alg;
 874         EVP_PKEY *pkey=NULL;
 875 #ifndef OPENSSL_NO_RSA
 876         RSA *rsa=NULL;
 877 #endif
 878 #ifndef OPENSSL_NO_DH
 879         DH *dh=NULL;
 880 #endif
 881
 882         n=ssl3_get_message(s,
 883                 SSL3_ST_CR_KEY_EXCH_A,
 884                 SSL3_ST_CR_KEY_EXCH_B,
 885                 -1,
 886                 1024*8, /* ?? */
 887                 &ok);
 888
 889         if (!ok) return((int)n);
 890
 891         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 892                 {
 893                 s->s3->tmp.reuse_message=1;
 894                 return(1);
 895                 }
 896
 897         param=p=(unsigned char *)s->init_buf->data;
 898
 899         if (s->session->sess_cert != NULL)
 900                 {
 901 #ifndef OPENSSL_NO_RSA
 902                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
 903                         {
 904                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
 905                         s->session->sess_cert->peer_rsa_tmp=NULL;
 906                         }
 907 #endif
 908 #ifndef OPENSSL_NO_DH
 909                 if (s->session->sess_cert->peer_dh_tmp)
 910                         {
 911                         DH_free(s->session->sess_cert->peer_dh_tmp);
 912                         s->session->sess_cert->peer_dh_tmp=NULL;
 913                         }
 914 #endif
 915                 }
 916         else
 917                 {
 918                 s->session->sess_cert=ssl_sess_cert_new();
 919                 }
 920
 921         param_len=0;
 922         alg=s->s3->tmp.new_cipher->algorithms;
 923
 924 #ifndef OPENSSL_NO_RSA
 925         if (alg & SSL_kRSA)
 926                 {
 927                 if ((rsa=RSA_new()) == NULL)
 928                         {
 929                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 930                         goto err;
 931                         }
 932                 n2s(p,i);
 933                 param_len=i+2;
 934                 if (param_len > n)
 935                         {
 936                         al=SSL_AD_DECODE_ERROR;
 937                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
 938                         goto f_err;
 939                         }
 940                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
 941                         {
 942                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 943                         goto err;
 944                         }
 945                 p+=i;
 946
 947                 n2s(p,i);
 948                 param_len+=i+2;
 949                 if (param_len > n)
 950                         {
 951                         al=SSL_AD_DECODE_ERROR;
 952                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
 953                         goto f_err;
 954                         }
 955                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
 956                         {
 957                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 958                         goto err;
 959                         }
 960                 p+=i;
 961                 n-=param_len;
 962
 963                 /* this should be because we are using an export cipher */
 964                 if (alg & SSL_aRSA)
 965                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 966                 else
 967                         {
 968                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 969                         goto err;
 970                         }
 971                 s->session->sess_cert->peer_rsa_tmp=rsa;
 972                 rsa=NULL;
 973                 }
 974 #else /* OPENSSL_NO_RSA */
 975         if (0)
 976                 ;
 977 #endif
 978 #ifndef OPENSSL_NO_DH
 979         else if (alg & SSL_kEDH)
 980                 {
 981                 if ((dh=DH_new()) == NULL)
 982                         {
 983                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
 984                         goto err;
 985                         }
 986                 n2s(p,i);
 987                 param_len=i+2;
 988                 if (param_len > n)
 989                         {
 990                         al=SSL_AD_DECODE_ERROR;
 991                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
 992                         goto f_err;
 993                         }
 994                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
 995                         {
 996                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 997                         goto err;
 998                         }
 999                 p+=i;
1000
1001                 n2s(p,i);
1002                 param_len+=i+2;
1003                 if (param_len > n)
1004                         {
1005                         al=SSL_AD_DECODE_ERROR;
1006                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1007                         goto f_err;
1008                         }
1009                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1010                         {
1011                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1012                         goto err;
1013                         }
1014                 p+=i;
1015
1016                 n2s(p,i);
1017                 param_len+=i+2;
1018                 if (param_len > n)
1019                         {
1020                         al=SSL_AD_DECODE_ERROR;
1021                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1022                         goto f_err;
1023                         }
1024                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1025                         {
1026                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1027                         goto err;
1028                         }
1029                 p+=i;
1030                 n-=param_len;
1031
1032 #ifndef OPENSSL_NO_RSA
1033                 if (alg & SSL_aRSA)
1034                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1035 #else
1036                 if (0)
1037                         ;
1038 #endif
1039 #ifndef OPENSSL_NO_DSA
1040                 else if (alg & SSL_aDSS)
1041                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1042 #endif
1043                 /* else anonymous DH, so no certificate or pkey. */
1044
1045                 s->session->sess_cert->peer_dh_tmp=dh;
1046                 dh=NULL;
1047                 }
1048         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1049                 {
1050                 al=SSL_AD_ILLEGAL_PARAMETER;
1051                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1052                 goto f_err;
1053                 }
1054 #endif /* !OPENSSL_NO_DH */
1055         if (alg & SSL_aFZA)
1056                 {
1057                 al=SSL_AD_HANDSHAKE_FAILURE;
1058                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1059                 goto f_err;
1060                 }
1061
1062
1063         /* p points to the next byte, there are 'n' bytes left */
1064
1065
1066         /* if it was signed, check the signature */
1067         if (pkey != NULL)
1068                 {
1069                 n2s(p,i);
1070                 n-=2;
1071                 j=EVP_PKEY_size(pkey);
1072
1073                 if ((i != n) || (n > j) || (n <= 0))
1074                         {
1075                         /* wrong packet length */
1076                         al=SSL_AD_DECODE_ERROR;
1077                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1078                         goto f_err;
1079                         }
1080
1081 #ifndef OPENSSL_NO_RSA
1082                 if (pkey->type == EVP_PKEY_RSA)
1083                         {
1084                         int num;
1085
1086                         j=0;
1087                         q=md_buf;
1088                         for (num=2; num > 0; num--)
1089                                 {
1090                                 EVP_DigestInit(&md_ctx,(num == 2)
1091                                         ?s->ctx->md5:s->ctx->sha1);
1092                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1093                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1094                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1095                                 EVP_DigestFinal(&md_ctx,q,(unsigned int *)&i);
1096                                 q+=i;
1097                                 j+=i;
1098                                 }
1099                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1100                                                                 pkey->pkey.rsa);
1101                         if (i < 0)
1102                                 {
1103                                 al=SSL_AD_DECRYPT_ERROR;
1104                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1105                                 goto f_err;
1106                                 }
1107                         if (i == 0)
1108                                 {
1109                                 /* bad signature */
1110                                 al=SSL_AD_DECRYPT_ERROR;
1111                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1112                                 goto f_err;
1113                                 }
1114                         }
1115                 else
1116 #endif
1117 #ifndef OPENSSL_NO_DSA
1118                         if (pkey->type == EVP_PKEY_DSA)
1119                         {
1120                         /* lets do DSS */
1121                         EVP_VerifyInit(&md_ctx,EVP_dss1());
1122                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1123                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1124                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1125                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1126                                 {
1127                                 /* bad signature */
1128                                 al=SSL_AD_DECRYPT_ERROR;
1129                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1130                                 goto f_err;
1131                                 }
1132                         }
1133                 else
1134 #endif
1135                         {
1136                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1137                         goto err;
1138                         }
1139                 }
1140         else
1141                 {
1142                 /* still data left over */
1143                 if (!(alg & SSL_aNULL))
1144                         {
1145                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1146                         goto err;
1147                         }
1148                 if (n != 0)
1149                         {
1150                         al=SSL_AD_DECODE_ERROR;
1151                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1152                         goto f_err;
1153                         }
1154                 }
1155         EVP_PKEY_free(pkey);
1156         return(1);
1157 f_err:
1158         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1159 err:
1160         EVP_PKEY_free(pkey);
1161 #ifndef OPENSSL_NO_RSA
1162         if (rsa != NULL)
1163                 RSA_free(rsa);
1164 #endif
1165 #ifndef OPENSSL_NO_DH
1166         if (dh != NULL)
1167                 DH_free(dh);
1168 #endif
1169         return(-1);
1170         }
1171
1172 static int ssl3_get_certificate_request(SSL *s)
1173         {
1174         int ok,ret=0;
1175         unsigned long n,nc,l;
1176         unsigned int llen,ctype_num,i;
1177         X509_NAME *xn=NULL;
1178         unsigned char *p,*d,*q;
1179         STACK_OF(X509_NAME) *ca_sk=NULL;
1180
1181         n=ssl3_get_message(s,
1182                 SSL3_ST_CR_CERT_REQ_A,
1183                 SSL3_ST_CR_CERT_REQ_B,
1184                 -1,
1185 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN32)
1186                 1024*30,  /* 30k max cert list :-) */
1187 #else
1188                 1024*100, /* 100k max cert list :-) */
1189 #endif
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_buf->data;
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
1434 #ifdef KSSL_DEBUG
1435                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1436                                 l, SSL_kKRB5);
1437 #endif  /* KSSL_DEBUG */
1438
1439                         /*
1440                         **      Tried to send random tmp_buf[] as PMS in Kerberos ticket
1441                         **      by passing  krb5_mk_req_extended(ctx,authctx,opts, tmp_buf, ...)
1442                         **      but: I can't retrieve the PMS on the other side!  There is
1443                         **      some indication in the krb5 source that this is only used
1444                         **      to generate a checksum.  OTOH, the Tung book shows data
1445                         **      ("GET widget01.txt") being passed in krb5_mk_req_extended()
1446                         **      by way of krb5_sendauth().  I don't get it.
1447                         **      Until Kerberos goes 3DES, the big PMS secret would only be
1448                         **      encrypted in 1-DES anyway.  So losing the PMS shouldn't be
1449                         **      a big deal.
1450                         */
1451                         krb5rc = kssl_cget_tkt(kssl_ctx, &krb5_ap_req,
1452                                 &kssl_err);
1453 #ifdef KSSL_DEBUG
1454                         {
1455                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1456                         kssl_ctx_show(kssl_ctx);
1457                         if (krb5rc && kssl_err.text)
1458                                 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1459                         }
1460 #endif  /* KSSL_DEBUG */
1461
1462                         if (krb5rc)
1463                                 {
1464                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1465                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
1466                                 goto err;
1467                                 }
1468
1469                         /*      Send ticket (copy to *p, set n = length)
1470                          */
1471                         n = krb5_ap_req.length;
1472                         memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1473                         if (krb5_ap_req.data)
1474                                 kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1475
1476                         /*      19991013 VRS -  3DES is kind of bogus here,
1477                         **      at least until Kerberos supports 3DES.  The only
1478                         **      real secret is the 8-byte Kerberos session key;
1479                         **      the other key material ((s->) client_random, server_random)
1480                         **      could be sniffed.  Mixing in these nonces should help
1481                         **      protect against replay attacks, however.
1482                         **
1483                         **      Alternate code for Kerberos Purists:
1484                         **
1485                         **      memcpy(s->session->master_key, kssl_ctx->key, kssl_ctx->length);
1486                         **      s->session->master_key_length = kssl_ctx->length;
1487                         */
1488                         s->session->master_key_length=
1489                                 s->method->ssl3_enc->generate_master_secret(s,
1490                                         s->session->master_key, kssl_ctx->key,kssl_ctx->length);
1491                         }
1492 #endif
1493 #ifndef OPENSSL_NO_DH
1494                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1495                         {
1496                         DH *dh_srvr,*dh_clnt;
1497
1498                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1499                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1500                         else
1501                                 {
1502                                 /* we get them from the cert */
1503                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1504                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1505                                 goto err;
1506                                 }
1507
1508                         /* generate a new random key */
1509                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1510                                 {
1511                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1512                                 goto err;
1513                                 }
1514                         if (!DH_generate_key(dh_clnt))
1515                                 {
1516                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1517                                 goto err;
1518                                 }
1519
1520                         /* use the 'p' output buffer for the DH key, but
1521                          * make sure to clear it out afterwards */
1522
1523                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1524
1525                         if (n <= 0)
1526                                 {
1527                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1528                                 goto err;
1529                                 }
1530
1531                         /* generate master key from the result */
1532                         s->session->master_key_length=
1533                                 s->method->ssl3_enc->generate_master_secret(s,
1534                                         s->session->master_key,p,n);
1535                         /* clean up */
1536                         memset(p,0,n);
1537
1538                         /* send off the data */
1539                         n=BN_num_bytes(dh_clnt->pub_key);
1540                         s2n(n,p);
1541                         BN_bn2bin(dh_clnt->pub_key,p);
1542                         n+=2;
1543
1544                         DH_free(dh_clnt);
1545
1546                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1547                         }
1548 #endif
1549                 else
1550                         {
1551                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1552                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1553                         goto err;
1554                         }
1555
1556                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1557                 l2n3(n,d);
1558
1559                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1560                 /* number of bytes to write */
1561                 s->init_num=n+4;
1562                 s->init_off=0;
1563                 }
1564
1565         /* SSL3_ST_CW_KEY_EXCH_B */
1566         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1567 err:
1568         return(-1);
1569         }
1570
1571 static int ssl3_send_client_verify(SSL *s)
1572         {
1573         unsigned char *p,*d;
1574         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1575         EVP_PKEY *pkey;
1576 #ifndef OPENSSL_NO_RSA
1577         unsigned u=0;
1578 #endif
1579         unsigned long n;
1580 #ifndef OPENSSL_NO_DSA
1581         int j;
1582 #endif
1583
1584         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1585                 {
1586                 d=(unsigned char *)s->init_buf->data;
1587                 p= &(d[4]);
1588                 pkey=s->cert->key->privatekey;
1589
1590                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1591                         &(data[MD5_DIGEST_LENGTH]));
1592
1593 #ifndef OPENSSL_NO_RSA
1594                 if (pkey->type == EVP_PKEY_RSA)
1595                         {
1596                         s->method->ssl3_enc->cert_verify_mac(s,
1597                                 &(s->s3->finish_dgst1),&(data[0]));
1598                         if (RSA_sign(NID_md5_sha1, data,
1599                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1600                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1601                                 {
1602                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1603                                 goto err;
1604                                 }
1605                         s2n(u,p);
1606                         n=u+2;
1607                         }
1608                 else
1609 #endif
1610 #ifndef OPENSSL_NO_DSA
1611                         if (pkey->type == EVP_PKEY_DSA)
1612                         {
1613                         if (!DSA_sign(pkey->save_type,
1614                                 &(data[MD5_DIGEST_LENGTH]),
1615                                 SHA_DIGEST_LENGTH,&(p[2]),
1616                                 (unsigned int *)&j,pkey->pkey.dsa))
1617                                 {
1618                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1619                                 goto err;
1620                                 }
1621                         s2n(j,p);
1622                         n=j+2;
1623                         }
1624                 else
1625 #endif
1626                         {
1627                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1628                         goto err;
1629                         }
1630                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1631                 l2n3(n,d);
1632
1633                 s->init_num=(int)n+4;
1634                 s->init_off=0;
1635                 }
1636         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1637 err:
1638         return(-1);
1639         }
1640
1641 static int ssl3_send_client_certificate(SSL *s)
1642         {
1643         X509 *x509=NULL;
1644         EVP_PKEY *pkey=NULL;
1645         int i;
1646         unsigned long l;
1647
1648         if (s->state == SSL3_ST_CW_CERT_A)
1649                 {
1650                 if ((s->cert == NULL) ||
1651                         (s->cert->key->x509 == NULL) ||
1652                         (s->cert->key->privatekey == NULL))
1653                         s->state=SSL3_ST_CW_CERT_B;
1654                 else
1655                         s->state=SSL3_ST_CW_CERT_C;
1656                 }
1657
1658         /* We need to get a client cert */
1659         if (s->state == SSL3_ST_CW_CERT_B)
1660                 {
1661                 /* If we get an error, we need to
1662                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1663                  * We then get retied later */
1664                 i=0;
1665                 if (s->ctx->client_cert_cb != NULL)
1666                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1667                 if (i < 0)
1668                         {
1669                         s->rwstate=SSL_X509_LOOKUP;
1670                         return(-1);
1671                         }
1672                 s->rwstate=SSL_NOTHING;
1673                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1674                         {
1675                         s->state=SSL3_ST_CW_CERT_B;
1676                         if (    !SSL_use_certificate(s,x509) ||
1677                                 !SSL_use_PrivateKey(s,pkey))
1678                                 i=0;
1679                         }
1680                 else if (i == 1)
1681                         {
1682                         i=0;
1683                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1684                         }
1685
1686                 if (x509 != NULL) X509_free(x509);
1687                 if (pkey != NULL) EVP_PKEY_free(pkey);
1688                 if (i == 0)
1689                         {
1690                         if (s->version == SSL3_VERSION)
1691                                 {
1692                                 s->s3->tmp.cert_req=0;
1693                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1694                                 return(1);
1695                                 }
1696                         else
1697                                 {
1698                                 s->s3->tmp.cert_req=2;
1699                                 }
1700                         }
1701
1702                 /* Ok, we have a cert */
1703                 s->state=SSL3_ST_CW_CERT_C;
1704                 }
1705
1706         if (s->state == SSL3_ST_CW_CERT_C)
1707                 {
1708                 s->state=SSL3_ST_CW_CERT_D;
1709                 l=ssl3_output_cert_chain(s,
1710                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1711                 s->init_num=(int)l;
1712                 s->init_off=0;
1713                 }
1714         /* SSL3_ST_CW_CERT_D */
1715         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1716         }
1717
1718 #define has_bits(i,m)   (((i)&(m)) == (m))
1719
1720 static int ssl3_check_cert_and_algorithm(SSL *s)
1721         {
1722         int i,idx;
1723         long algs;
1724         EVP_PKEY *pkey=NULL;
1725         SESS_CERT *sc;
1726 #ifndef OPENSSL_NO_RSA
1727         RSA *rsa;
1728 #endif
1729 #ifndef OPENSSL_NO_DH
1730         DH *dh;
1731 #endif
1732
1733         sc=s->session->sess_cert;
1734
1735         if (sc == NULL)
1736                 {
1737                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
1738                 goto err;
1739                 }
1740
1741         algs=s->s3->tmp.new_cipher->algorithms;
1742
1743         /* we don't have a certificate */
1744         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
1745                 return(1);
1746
1747 #ifndef OPENSSL_NO_RSA
1748         rsa=s->session->sess_cert->peer_rsa_tmp;
1749 #endif
1750 #ifndef OPENSSL_NO_DH
1751         dh=s->session->sess_cert->peer_dh_tmp;
1752 #endif
1753
1754         /* This is the passed certificate */
1755
1756         idx=sc->peer_cert_type;
1757         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1758         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1759         EVP_PKEY_free(pkey);
1760
1761
1762         /* Check that we have a certificate if we require one */
1763         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1764                 {
1765                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1766                 goto f_err;
1767                 }
1768 #ifndef OPENSSL_NO_DSA
1769         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1770                 {
1771                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1772                 goto f_err;
1773                 }
1774 #endif
1775 #ifndef OPENSSL_NO_RSA
1776         if ((algs & SSL_kRSA) &&
1777                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1778                 {
1779                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1780                 goto f_err;
1781                 }
1782 #endif
1783 #ifndef OPENSSL_NO_DH
1784         if ((algs & SSL_kEDH) &&
1785                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1786                 {
1787                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1788                 goto f_err;
1789                 }
1790         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1791                 {
1792                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1793                 goto f_err;
1794                 }
1795 #ifndef OPENSSL_NO_DSA
1796         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1797                 {
1798                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1799                 goto f_err;
1800                 }
1801 #endif
1802 #endif
1803
1804         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
1805                 {
1806 #ifndef OPENSSL_NO_RSA
1807                 if (algs & SSL_kRSA)
1808                         {
1809                         if (rsa == NULL
1810                             || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1811                                 {
1812                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1813                                 goto f_err;
1814                                 }
1815                         }
1816                 else
1817 #endif
1818 #ifndef OPENSSL_NO_DH
1819                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1820                             {
1821                             if (dh == NULL
1822                                 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1823                                 {
1824                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1825                                 goto f_err;
1826                                 }
1827                         }
1828                 else
1829 #endif
1830                         {
1831                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1832                         goto f_err;
1833                         }
1834                 }
1835         return(1);
1836 f_err:
1837         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1838 err:
1839         return(0);
1840         }
1841