ssl/s3_srvr.c

   1 /* ssl/s3_srvr.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 #define REUSE_CIPHER_BUG
  60
  61 #include <stdio.h>
  62 #include <openssl/buffer.h>
  63 #include <openssl/rand.h>
  64 #include <openssl/objects.h>
  65 #include <openssl/md5.h>
  66 #include <openssl/sha.h>
  67 #include <openssl/evp.h>
  68 #include <openssl/x509.h>
  69 #include "ssl_locl.h"
  70
  71 static SSL_METHOD *ssl3_get_server_method(int ver);
  72 static int ssl3_get_client_hello(SSL *s);
  73 static int ssl3_send_server_hello(SSL *s);
  74 static int ssl3_send_server_key_exchange(SSL *s);
  75 static int ssl3_send_certificate_request(SSL *s);
  76 static int ssl3_send_server_done(SSL *s);
  77 static int ssl3_get_cert_verify(SSL *s);
  78 static int ssl3_get_client_key_exchange(SSL *s);
  79 static int ssl3_get_client_certificate(SSL *s);
  80 static int ssl3_send_hello_request(SSL *s);
  81
  82 static SSL_METHOD *ssl3_get_server_method(int ver)
  83         {
  84         if (ver == SSL3_VERSION)
  85                 return(SSLv3_server_method());
  86         else
  87                 return(NULL);
  88         }
  89
  90 SSL_METHOD *SSLv3_server_method(void)
  91         {
  92         static int init=1;
  93         static SSL_METHOD SSLv3_server_data;
  94
  95         if (init)
  96                 {
  97                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
  98                         sizeof(SSL_METHOD));
  99                 SSLv3_server_data.ssl_accept=ssl3_accept;
 100                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 101                 init=0;
 102                 }
 103         return(&SSLv3_server_data);
 104         }
 105
 106 int ssl3_accept(SSL *s)
 107         {
 108         BUF_MEM *buf;
 109         unsigned long l,Time=time(NULL);
 110         void (*cb)()=NULL;
 111         long num1;
 112         int ret= -1;
 113         int new_state,state,skip=0;
 114
 115         RAND_seed(&Time,sizeof(Time));
 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         /* init things to blank */
 125         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 126         s->in_handshake++;
 127
 128         if (s->cert == NULL)
 129                 {
 130                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 131                 return(-1);
 132                 }
 133
 134         for (;;)
 135                 {
 136                 state=s->state;
 137
 138                 switch (s->state)
 139                         {
 140                 case SSL_ST_RENEGOTIATE:
 141                         s->new_session=1;
 142                         /* s->state=SSL_ST_ACCEPT; */
 143
 144                 case SSL_ST_BEFORE:
 145                 case SSL_ST_ACCEPT:
 146                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 147                 case SSL_ST_OK|SSL_ST_ACCEPT:
 148
 149                         s->server=1;
 150                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 151
 152                         if ((s->version>>8) != 3)
 153                                 abort();
 154                         /* s->version=SSL3_VERSION; */
 155                         s->type=SSL_ST_ACCEPT;
 156
 157                         if (s->init_buf == NULL)
 158                                 {
 159                                 if ((buf=BUF_MEM_new()) == NULL)
 160                                         {
 161                                         ret= -1;
 162                                         goto end;
 163                                         }
 164                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 165                                         {
 166                                         ret= -1;
 167                                         goto end;
 168                                         }
 169                                 s->init_buf=buf;
 170                                 }
 171
 172                         if (!ssl3_setup_buffers(s))
 173                                 {
 174                                 ret= -1;
 175                                 goto end;
 176                                 }
 177
 178                         /* Ok, we now need to push on a buffering BIO so that
 179                          * the output is sent in a way that TCP likes :-)
 180                          */
 181                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 182
 183                         s->init_num=0;
 184
 185                         if (s->state != SSL_ST_RENEGOTIATE)
 186                                 {
 187                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 188                                 ssl3_init_finished_mac(s);
 189                                 s->ctx->stats.sess_accept++;
 190                                 }
 191                         else
 192                                 {
 193                                 s->ctx->stats.sess_accept_renegotiate++;
 194                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 195                                 }
 196                         break;
 197
 198                 case SSL3_ST_SW_HELLO_REQ_A:
 199                 case SSL3_ST_SW_HELLO_REQ_B:
 200
 201                         s->shutdown=0;
 202                         ret=ssl3_send_hello_request(s);
 203                         if (ret <= 0) goto end;
 204                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 205                         s->state=SSL3_ST_SW_FLUSH;
 206                         s->init_num=0;
 207
 208                         ssl3_init_finished_mac(s);
 209                         break;
 210
 211                 case SSL3_ST_SW_HELLO_REQ_C:
 212                         s->state=SSL_ST_OK;
 213                         ret=1;
 214                         goto end;
 215                         /* break; */
 216
 217                 case SSL3_ST_SR_CLNT_HELLO_A:
 218                 case SSL3_ST_SR_CLNT_HELLO_B:
 219                 case SSL3_ST_SR_CLNT_HELLO_C:
 220
 221                         s->shutdown=0;
 222                         ret=ssl3_get_client_hello(s);
 223                         if (ret <= 0) goto end;
 224                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 225                         s->init_num=0;
 226                         break;
 227
 228                 case SSL3_ST_SW_SRVR_HELLO_A:
 229                 case SSL3_ST_SW_SRVR_HELLO_B:
 230                         ret=ssl3_send_server_hello(s);
 231                         if (ret <= 0) goto end;
 232
 233                         if (s->hit)
 234                                 s->state=SSL3_ST_SW_CHANGE_A;
 235                         else
 236                                 s->state=SSL3_ST_SW_CERT_A;
 237                         s->init_num=0;
 238                         break;
 239
 240                 case SSL3_ST_SW_CERT_A:
 241                 case SSL3_ST_SW_CERT_B:
 242                         /* Check if it is anon DH */
 243                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 244                                 {
 245                                 ret=ssl3_send_server_certificate(s);
 246                                 if (ret <= 0) goto end;
 247                                 }
 248                         else
 249                                 skip=1;
 250                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 251                         s->init_num=0;
 252                         break;
 253
 254                 case SSL3_ST_SW_KEY_EXCH_A:
 255                 case SSL3_ST_SW_KEY_EXCH_B:
 256                         l=s->s3->tmp.new_cipher->algorithms;
 257
 258                         /* clear this, it may get reset by
 259                          * send_server_key_exchange */
 260                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 261                                 s->s3->tmp.use_rsa_tmp=1;
 262                         else
 263                                 s->s3->tmp.use_rsa_tmp=0;
 264
 265                         /* only send if a DH key exchange, fortezza or
 266                          * RSA but we have a sign only certificate */
 267                         if (s->s3->tmp.use_rsa_tmp
 268                             || (l & (SSL_DH|SSL_kFZA))
 269                             || ((l & SSL_kRSA)
 270                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 271                                     || (SSL_IS_EXPORT(l)
 272                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_EXPORT_PKEYLENGTH(l)
 273                                         )
 274                                     )
 275                                 )
 276                             )
 277                                 {
 278                                 ret=ssl3_send_server_key_exchange(s);
 279                                 if (ret <= 0) goto end;
 280                                 }
 281                         else
 282                                 skip=1;
 283
 284                         s->state=SSL3_ST_SW_CERT_REQ_A;
 285                         s->init_num=0;
 286                         break;
 287
 288                 case SSL3_ST_SW_CERT_REQ_A:
 289                 case SSL3_ST_SW_CERT_REQ_B:
 290                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 291                                 ((s->session->peer != NULL) &&
 292                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 293                                 {
 294                                 /* no cert request */
 295                                 skip=1;
 296                                 s->s3->tmp.cert_request=0;
 297                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 298                                 }
 299                         else
 300                                 {
 301                                 s->s3->tmp.cert_request=1;
 302                                 ret=ssl3_send_certificate_request(s);
 303                                 if (ret <= 0) goto end;
 304                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 305                                 s->init_num=0;
 306                                 }
 307                         break;
 308
 309                 case SSL3_ST_SW_SRVR_DONE_A:
 310                 case SSL3_ST_SW_SRVR_DONE_B:
 311                         ret=ssl3_send_server_done(s);
 312                         if (ret <= 0) goto end;
 313                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 314                         s->state=SSL3_ST_SW_FLUSH;
 315                         s->init_num=0;
 316                         break;
 317
 318                 case SSL3_ST_SW_FLUSH:
 319                         /* number of bytes to be flushed */
 320                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 321                         if (num1 > 0)
 322                                 {
 323                                 s->rwstate=SSL_WRITING;
 324                                 num1=BIO_flush(s->wbio);
 325                                 if (num1 <= 0) { ret= -1; goto end; }
 326                                 s->rwstate=SSL_NOTHING;
 327                                 }
 328
 329                         s->state=s->s3->tmp.next_state;
 330                         break;
 331
 332                 case SSL3_ST_SR_CERT_A:
 333                 case SSL3_ST_SR_CERT_B:
 334                         /* could be sent for a DH cert, even if we
 335                          * have not asked for it :-) */
 336                         ret=ssl3_get_client_certificate(s);
 337                         if (ret <= 0) goto end;
 338                         s->init_num=0;
 339                         s->state=SSL3_ST_SR_KEY_EXCH_A;
 340                         break;
 341
 342                 case SSL3_ST_SR_KEY_EXCH_A:
 343                 case SSL3_ST_SR_KEY_EXCH_B:
 344                         ret=ssl3_get_client_key_exchange(s);
 345                         if (ret <= 0) goto end;
 346                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 347                         s->init_num=0;
 348
 349                         /* We need to get hashes here so if there is
 350                          * a client cert, it can be verified */
 351                         s->method->ssl3_enc->cert_verify_mac(s,
 352                                 &(s->s3->finish_dgst1),
 353                                 &(s->s3->tmp.finish_md[0]));
 354                         s->method->ssl3_enc->cert_verify_mac(s,
 355                                 &(s->s3->finish_dgst2),
 356                                 &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]));
 357
 358                         break;
 359
 360                 case SSL3_ST_SR_CERT_VRFY_A:
 361                 case SSL3_ST_SR_CERT_VRFY_B:
 362
 363                         /* we should decide if we expected this one */
 364                         ret=ssl3_get_cert_verify(s);
 365                         if (ret <= 0) goto end;
 366
 367                         s->state=SSL3_ST_SR_FINISHED_A;
 368                         s->init_num=0;
 369                         break;
 370
 371                 case SSL3_ST_SR_FINISHED_A:
 372                 case SSL3_ST_SR_FINISHED_B:
 373                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 374                                 SSL3_ST_SR_FINISHED_B);
 375                         if (ret <= 0) goto end;
 376                         if (s->hit)
 377                                 s->state=SSL_ST_OK;
 378                         else
 379                                 s->state=SSL3_ST_SW_CHANGE_A;
 380                         s->init_num=0;
 381                         break;
 382
 383                 case SSL3_ST_SW_CHANGE_A:
 384                 case SSL3_ST_SW_CHANGE_B:
 385
 386                         s->session->cipher=s->s3->tmp.new_cipher;
 387                         if (!s->method->ssl3_enc->setup_key_block(s))
 388                                 { ret= -1; goto end; }
 389
 390                         ret=ssl3_send_change_cipher_spec(s,
 391                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 392
 393                         if (ret <= 0) goto end;
 394                         s->state=SSL3_ST_SW_FINISHED_A;
 395                         s->init_num=0;
 396
 397                         if (!s->method->ssl3_enc->change_cipher_state(s,
 398                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 399                                 {
 400                                 ret= -1;
 401                                 goto end;
 402                                 }
 403
 404                         break;
 405
 406                 case SSL3_ST_SW_FINISHED_A:
 407                 case SSL3_ST_SW_FINISHED_B:
 408                         ret=ssl3_send_finished(s,
 409                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 410                                 s->method->ssl3_enc->server_finished,
 411                                 s->method->ssl3_enc->server_finished_len);
 412                         if (ret <= 0) goto end;
 413                         s->state=SSL3_ST_SW_FLUSH;
 414                         if (s->hit)
 415                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 416                         else
 417                                 s->s3->tmp.next_state=SSL_ST_OK;
 418                         s->init_num=0;
 419                         break;
 420
 421                 case SSL_ST_OK:
 422                         /* clean a few things up */
 423                         ssl3_cleanup_key_block(s);
 424
 425                         BUF_MEM_free(s->init_buf);
 426                         s->init_buf=NULL;
 427
 428                         /* remove buffering on output */
 429                         ssl_free_wbio_buffer(s);
 430
 431                         s->new_session=0;
 432                         s->init_num=0;
 433
 434                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 435
 436                         s->ctx->stats.sess_accept_good++;
 437                         /* s->server=1; */
 438                         s->handshake_func=ssl3_accept;
 439                         ret=1;
 440
 441                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 442
 443                         goto end;
 444                         /* break; */
 445
 446                 default:
 447                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 448                         ret= -1;
 449                         goto end;
 450                         /* break; */
 451                         }
 452
 453                 if (!s->s3->tmp.reuse_message && !skip)
 454                         {
 455                         if (s->debug)
 456                                 {
 457                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 458                                         goto end;
 459                                 }
 460
 461
 462                         if ((cb != NULL) && (s->state != state))
 463                                 {
 464                                 new_state=s->state;
 465                                 s->state=state;
 466                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 467                                 s->state=new_state;
 468                                 }
 469                         }
 470                 skip=0;
 471                 }
 472 end:
 473         /* BIO_flush(s->wbio); */
 474
 475         if (cb != NULL)
 476                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 477         s->in_handshake--;
 478         return(ret);
 479         }
 480
 481 static int ssl3_send_hello_request(SSL *s)
 482         {
 483         unsigned char *p;
 484
 485         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 486                 {
 487                 p=(unsigned char *)s->init_buf->data;
 488                 *(p++)=SSL3_MT_CLIENT_REQUEST;
 489                 *(p++)=0;
 490                 *(p++)=0;
 491                 *(p++)=0;
 492
 493                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 494                 /* number of bytes to write */
 495                 s->init_num=4;
 496                 s->init_off=0;
 497                 }
 498
 499         /* SSL3_ST_SW_HELLO_REQ_B */
 500         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 501         }
 502
 503 static int ssl3_get_client_hello(SSL *s)
 504         {
 505         int i,j,ok,al,ret= -1;
 506         long n;
 507         unsigned long id;
 508         unsigned char *p,*d,*q;
 509         SSL_CIPHER *c;
 510         SSL_COMP *comp=NULL;
 511         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 512
 513         /* We do this so that we will respond with our native type.
 514          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 515          * This down switching should be handled by a different method.
 516          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 517          * TLSv1.
 518          */
 519         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 520                 {
 521                 s->first_packet=1;
 522                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 523                 }
 524         n=ssl3_get_message(s,
 525                 SSL3_ST_SR_CLNT_HELLO_B,
 526                 SSL3_ST_SR_CLNT_HELLO_C,
 527                 SSL3_MT_CLIENT_HELLO,
 528                 SSL3_RT_MAX_PLAIN_LENGTH,
 529                 &ok);
 530
 531         if (!ok) return((int)n);
 532         d=p=(unsigned char *)s->init_buf->data;
 533
 534         /* The version number has already been checked in ssl3_get_message.
 535          * I a native TLSv1/SSLv3 method, the match must be correct except
 536          * perhaps for the first message */
 537 /*      s->client_version=(((int)p[0])<<8)|(int)p[1]; */
 538         p+=2;
 539
 540         /* load the client random */
 541         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 542         p+=SSL3_RANDOM_SIZE;
 543
 544         /* get the session-id */
 545         j= *(p++);
 546
 547         s->hit=0;
 548         if (j == 0)
 549                 {
 550                 if (!ssl_get_new_session(s,1))
 551                         goto err;
 552                 }
 553         else
 554                 {
 555                 i=ssl_get_prev_session(s,p,j);
 556                 if (i == 1)
 557                         { /* previous session */
 558                         s->hit=1;
 559                         }
 560                 else
 561                         {
 562                         if (!ssl_get_new_session(s,1))
 563                                 goto err;
 564                         }
 565                 }
 566
 567         p+=j;
 568         n2s(p,i);
 569         if ((i == 0) && (j != 0))
 570                 {
 571                 /* we need a cipher if we are not resuming a session */
 572                 al=SSL_AD_ILLEGAL_PARAMETER;
 573                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 574                 goto f_err;
 575                 }
 576         if ((i+p) > (d+n))
 577                 {
 578                 /* not enough data */
 579                 al=SSL_AD_DECODE_ERROR;
 580                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 581                 goto f_err;
 582                 }
 583         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 584                 == NULL))
 585                 {
 586                 goto err;
 587                 }
 588         p+=i;
 589
 590         /* If it is a hit, check that the cipher is in the list */
 591         if ((s->hit) && (i > 0))
 592                 {
 593                 j=0;
 594                 id=s->session->cipher->id;
 595
 596 #ifdef CIPHER_DEBUG
 597                 printf("client sent %d ciphers\n",sk_num(ciphers));
 598 #endif
 599                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 600                         {
 601                         c=sk_SSL_CIPHER_value(ciphers,i);
 602 #ifdef CIPHER_DEBUG
 603                         printf("client [%2d of %2d]:%s\n",
 604                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 605 #endif
 606                         if (c->id == id)
 607                                 {
 608                                 j=1;
 609                                 break;
 610                                 }
 611                         }
 612                 if (j == 0)
 613                         {
 614                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 615                                 {
 616                                 /* Very bad for multi-threading.... */
 617                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 618                                                                        0);
 619                                 }
 620                         else
 621                                 {
 622                                 /* we need to have the cipher in the cipher
 623                                  * list if we are asked to reuse it */
 624                                 al=SSL_AD_ILLEGAL_PARAMETER;
 625                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 626                                 goto f_err;
 627                                 }
 628                         }
 629                 }
 630
 631         /* compression */
 632         i= *(p++);
 633         q=p;
 634         for (j=0; j<i; j++)
 635                 {
 636                 if (p[j] == 0) break;
 637                 }
 638
 639         p+=i;
 640         if (j >= i)
 641                 {
 642                 /* no compress */
 643                 al=SSL_AD_DECODE_ERROR;
 644                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 645                 goto f_err;
 646                 }
 647
 648         /* Worst case, we will use the NULL compression, but if we have other
 649          * options, we will now look for them.  We have i-1 compression
 650          * algorithms from the client, starting at q. */
 651         s->s3->tmp.new_compression=NULL;
 652         if (s->ctx->comp_methods != NULL)
 653                 { /* See if we have a match */
 654                 int m,nn,o,v,done=0;
 655
 656                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 657                 for (m=0; m<nn; m++)
 658                         {
 659                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 660                         v=comp->id;
 661                         for (o=0; o<i; o++)
 662                                 {
 663                                 if (v == q[o])
 664                                         {
 665                                         done=1;
 666                                         break;
 667                                         }
 668                                 }
 669                         if (done) break;
 670                         }
 671                 if (done)
 672                         s->s3->tmp.new_compression=comp;
 673                 else
 674                         comp=NULL;
 675                 }
 676
 677         /* TLS does not mind if there is extra stuff */
 678         if (s->version == SSL3_VERSION)
 679                 {
 680                 if (p > (d+n))
 681                         {
 682                         /* wrong number of bytes,
 683                          * there could be more to follow */
 684                         al=SSL_AD_DECODE_ERROR;
 685                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 686                         goto f_err;
 687                         }
 688                 }
 689
 690         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 691          * pick a cipher */
 692
 693         if (!s->hit)
 694                 {
 695                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 696                 if (s->session->ciphers != NULL)
 697                         sk_SSL_CIPHER_free(s->session->ciphers);
 698                 s->session->ciphers=ciphers;
 699                 if (ciphers == NULL)
 700                         {
 701                         al=SSL_AD_ILLEGAL_PARAMETER;
 702                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 703                         goto f_err;
 704                         }
 705                 ciphers=NULL;
 706                 c=ssl3_choose_cipher(s,s->session->ciphers,
 707                                      ssl_get_ciphers_by_id(s));
 708
 709                 if (c == NULL)
 710                         {
 711                         al=SSL_AD_HANDSHAKE_FAILURE;
 712                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 713                         goto f_err;
 714                         }
 715                 s->s3->tmp.new_cipher=c;
 716                 }
 717         else
 718                 {
 719                 /* Session-id reuse */
 720 #ifdef REUSE_CIPHER_BUG
 721                 STACK_OF(SSL_CIPHER) *sk;
 722                 SSL_CIPHER *nc=NULL;
 723                 SSL_CIPHER *ec=NULL;
 724
 725                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 726                         {
 727                         sk=s->session->ciphers;
 728                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 729                                 {
 730                                 c=sk_SSL_CIPHER_value(sk,i);
 731                                 if (c->algorithms & SSL_eNULL)
 732                                         nc=c;
 733                                 if (SSL_C_IS_EXPORT(c))
 734                                         ec=c;
 735                                 }
 736                         if (nc != NULL)
 737                                 s->s3->tmp.new_cipher=nc;
 738                         else if (ec != NULL)
 739                                 s->s3->tmp.new_cipher=ec;
 740                         else
 741                                 s->s3->tmp.new_cipher=s->session->cipher;
 742                         }
 743                 else
 744 #endif
 745                 s->s3->tmp.new_cipher=s->session->cipher;
 746                 }
 747
 748         /* we now have the following setup.
 749          * client_random
 750          * cipher_list          - our prefered list of ciphers
 751          * ciphers              - the clients prefered list of ciphers
 752          * compression          - basically ignored right now
 753          * ssl version is set   - sslv3
 754          * s->session           - The ssl session has been setup.
 755          * s->hit               - sesson reuse flag
 756          * s->tmp.new_cipher    - the new cipher to use.
 757          */
 758
 759         ret=1;
 760         if (0)
 761                 {
 762 f_err:
 763                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 764                 }
 765 err:
 766         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 767         return(ret);
 768         }
 769
 770 static int ssl3_send_server_hello(SSL *s)
 771         {
 772         unsigned char *buf;
 773         unsigned char *p,*d;
 774         int i,sl;
 775         unsigned long l,Time;
 776
 777         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 778                 {
 779                 buf=(unsigned char *)s->init_buf->data;
 780                 p=s->s3->server_random;
 781                 Time=time(NULL);                        /* Time */
 782                 l2n(Time,p);
 783                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 784                 /* Do the message type and length last */
 785                 d=p= &(buf[4]);
 786
 787                 *(p++)=s->version>>8;
 788                 *(p++)=s->version&0xff;
 789
 790                 /* Random stuff */
 791                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 792                 p+=SSL3_RANDOM_SIZE;
 793
 794                 /* now in theory we have 3 options to sending back the
 795                  * session id.  If it is a re-use, we send back the
 796                  * old session-id, if it is a new session, we send
 797                  * back the new session-id or we send back a 0 length
 798                  * session-id if we want it to be single use.
 799                  * Currently I will not implement the '0' length session-id
 800                  * 12-Jan-98 - I'll now support the '0' length stuff.
 801                  */
 802                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 803                         s->session->session_id_length=0;
 804
 805                 sl=s->session->session_id_length;
 806                 *(p++)=sl;
 807                 memcpy(p,s->session->session_id,sl);
 808                 p+=sl;
 809
 810                 /* put the cipher */
 811                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 812                 p+=i;
 813
 814                 /* put the compression method */
 815                 if (s->s3->tmp.new_compression == NULL)
 816                         *(p++)=0;
 817                 else
 818                         *(p++)=s->s3->tmp.new_compression->id;
 819
 820                 /* do the header */
 821                 l=(p-d);
 822                 d=buf;
 823                 *(d++)=SSL3_MT_SERVER_HELLO;
 824                 l2n3(l,d);
 825
 826                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 827                 /* number of bytes to write */
 828                 s->init_num=p-buf;
 829                 s->init_off=0;
 830                 }
 831
 832         /* SSL3_ST_CW_CLNT_HELLO_B */
 833         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 834         }
 835
 836 static int ssl3_send_server_done(SSL *s)
 837         {
 838         unsigned char *p;
 839
 840         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 841                 {
 842                 p=(unsigned char *)s->init_buf->data;
 843
 844                 /* do the header */
 845                 *(p++)=SSL3_MT_SERVER_DONE;
 846                 *(p++)=0;
 847                 *(p++)=0;
 848                 *(p++)=0;
 849
 850                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 851                 /* number of bytes to write */
 852                 s->init_num=4;
 853                 s->init_off=0;
 854                 }
 855
 856         /* SSL3_ST_CW_CLNT_HELLO_B */
 857         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 858         }
 859
 860 static int ssl3_send_server_key_exchange(SSL *s)
 861         {
 862 #ifndef NO_RSA
 863         unsigned char *q;
 864         int j,num;
 865         RSA *rsa;
 866         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 867 #endif
 868 #ifndef NO_DH
 869         DH *dh,*dhp;
 870 #endif
 871         EVP_PKEY *pkey;
 872         unsigned char *p,*d;
 873         int al,i;
 874         unsigned long type;
 875         int n;
 876         CERT *cert;
 877         BIGNUM *r[4];
 878         int nr[4],kn;
 879         BUF_MEM *buf;
 880         EVP_MD_CTX md_ctx;
 881
 882         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 883                 {
 884                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 885                 cert=s->cert;
 886
 887                 buf=s->init_buf;
 888
 889                 r[0]=r[1]=r[2]=r[3]=NULL;
 890                 n=0;
 891 #ifndef NO_RSA
 892                 if (type & SSL_kRSA)
 893                         {
 894                         rsa=cert->rsa_tmp;
 895                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 896                                 {
 897                                 rsa=s->cert->rsa_tmp_cb(s,
 898                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 899                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 900                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 901                                 cert->rsa_tmp=rsa;
 902                                 }
 903                         if (rsa == NULL)
 904                                 {
 905                                 al=SSL_AD_HANDSHAKE_FAILURE;
 906                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 907                                 goto f_err;
 908                                 }
 909                         r[0]=rsa->n;
 910                         r[1]=rsa->e;
 911                         s->s3->tmp.use_rsa_tmp=1;
 912                         }
 913                 else
 914 #endif
 915 #ifndef NO_DH
 916                         if (type & SSL_kEDH)
 917                         {
 918                         dhp=cert->dh_tmp;
 919                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 920                                 dhp=s->cert->dh_tmp_cb(s,
 921                                       !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 922                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 923                         if (dhp == NULL)
 924                                 {
 925                                 al=SSL_AD_HANDSHAKE_FAILURE;
 926                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 927                                 goto f_err;
 928                                 }
 929                         if ((dh=DHparams_dup(dhp)) == NULL)
 930                                 {
 931                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 932                                 goto err;
 933                                 }
 934
 935                         s->s3->tmp.dh=dh;
 936                         if ((dhp->pub_key == NULL ||
 937                              dhp->priv_key == NULL ||
 938                              (s->options & SSL_OP_SINGLE_DH_USE)))
 939                                 {
 940                                 if(!DH_generate_key(dh))
 941                                     {
 942                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
 943                                            ERR_R_DH_LIB);
 944                                     goto err;
 945                                     }
 946                                 }
 947                         else
 948                                 {
 949                                 dh->pub_key=BN_dup(dhp->pub_key);
 950                                 dh->priv_key=BN_dup(dhp->priv_key);
 951                                 if ((dh->pub_key == NULL) ||
 952                                         (dh->priv_key == NULL))
 953                                         {
 954                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 955                                         goto err;
 956                                         }
 957                                 }
 958                         r[0]=dh->p;
 959                         r[1]=dh->g;
 960                         r[2]=dh->pub_key;
 961                         }
 962                 else
 963 #endif
 964                         {
 965                         al=SSL_AD_HANDSHAKE_FAILURE;
 966                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 967                         goto f_err;
 968                         }
 969                 for (i=0; r[i] != NULL; i++)
 970                         {
 971                         nr[i]=BN_num_bytes(r[i]);
 972                         n+=2+nr[i];
 973                         }
 974
 975                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 976                         {
 977                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 978                                 == NULL)
 979                                 {
 980                                 al=SSL_AD_DECODE_ERROR;
 981                                 goto f_err;
 982                                 }
 983                         kn=EVP_PKEY_size(pkey);
 984                         }
 985                 else
 986                         {
 987                         pkey=NULL;
 988                         kn=0;
 989                         }
 990
 991                 if (!BUF_MEM_grow(buf,n+4+kn))
 992                         {
 993                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 994                         goto err;
 995                         }
 996                 d=(unsigned char *)s->init_buf->data;
 997                 p= &(d[4]);
 998
 999                 for (i=0; r[i] != NULL; i++)
1000                         {
1001                         s2n(nr[i],p);
1002                         BN_bn2bin(r[i],p);
1003                         p+=nr[i];
1004                         }
1005
1006                 /* not anonymous */
1007                 if (pkey != NULL)
1008                         {
1009                         /* n is the length of the params, they start at &(d[4])
1010                          * and p points to the space at the end. */
1011 #ifndef NO_RSA
1012                         if (pkey->type == EVP_PKEY_RSA)
1013                                 {
1014                                 q=md_buf;
1015                                 j=0;
1016                                 for (num=2; num > 0; num--)
1017                                         {
1018                                         EVP_DigestInit(&md_ctx,(num == 2)
1019                                                 ?s->ctx->md5:s->ctx->sha1);
1020                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1021                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1022                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1023                                         EVP_DigestFinal(&md_ctx,q,
1024                                                 (unsigned int *)&i);
1025                                         q+=i;
1026                                         j+=i;
1027                                         }
1028                                 i=RSA_private_encrypt(j,md_buf,&(p[2]),
1029                                         pkey->pkey.rsa,RSA_PKCS1_PADDING);
1030                                 if (i <= 0)
1031                                         {
1032                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1033                                         goto err;
1034                                         }
1035                                 s2n(i,p);
1036                                 n+=i+2;
1037                                 }
1038                         else
1039 #endif
1040 #if !defined(NO_DSA)
1041                                 if (pkey->type == EVP_PKEY_DSA)
1042                                 {
1043                                 /* lets do DSS */
1044                                 EVP_SignInit(&md_ctx,EVP_dss1());
1045                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1046                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1047                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1048                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1049                                         (unsigned int *)&i,pkey))
1050                                         {
1051                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1052                                         goto err;
1053                                         }
1054                                 s2n(i,p);
1055                                 n+=i+2;
1056                                 }
1057                         else
1058 #endif
1059                                 {
1060                                 /* Is this error check actually needed? */
1061                                 al=SSL_AD_HANDSHAKE_FAILURE;
1062                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1063                                 goto f_err;
1064                                 }
1065                         }
1066
1067                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1068                 l2n3(n,d);
1069
1070                 /* we should now have things packed up, so lets send
1071                  * it off */
1072                 s->init_num=n+4;
1073                 s->init_off=0;
1074                 }
1075
1076         /* SSL3_ST_SW_KEY_EXCH_B */
1077         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1078 f_err:
1079         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1080 err:
1081         return(-1);
1082         }
1083
1084 static int ssl3_send_certificate_request(SSL *s)
1085         {
1086         unsigned char *p,*d;
1087         int i,j,nl,off,n;
1088         STACK_OF(X509_NAME) *sk=NULL;
1089         X509_NAME *name;
1090         BUF_MEM *buf;
1091
1092         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1093                 {
1094                 buf=s->init_buf;
1095
1096                 d=p=(unsigned char *)&(buf->data[4]);
1097
1098                 /* get the list of acceptable cert types */
1099                 p++;
1100                 n=ssl3_get_req_cert_type(s,p);
1101                 d[0]=n;
1102                 p+=n;
1103                 n++;
1104
1105                 off=n;
1106                 p+=2;
1107                 n+=2;
1108
1109                 sk=SSL_get_client_CA_list(s);
1110                 nl=0;
1111                 if (sk != NULL)
1112                         {
1113                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1114                                 {
1115                                 name=sk_X509_NAME_value(sk,i);
1116                                 j=i2d_X509_NAME(name,NULL);
1117                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1118                                         {
1119                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1120                                         goto err;
1121                                         }
1122                                 p=(unsigned char *)&(buf->data[4+n]);
1123                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1124                                         {
1125                                         s2n(j,p);
1126                                         i2d_X509_NAME(name,&p);
1127                                         n+=2+j;
1128                                         nl+=2+j;
1129                                         }
1130                                 else
1131                                         {
1132                                         d=p;
1133                                         i2d_X509_NAME(name,&p);
1134                                         j-=2; s2n(j,d); j+=2;
1135                                         n+=j;
1136                                         nl+=j;
1137                                         }
1138                                 }
1139                         }
1140                 /* else no CA names */
1141                 p=(unsigned char *)&(buf->data[4+off]);
1142                 s2n(nl,p);
1143
1144                 d=(unsigned char *)buf->data;
1145                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1146                 l2n3(n,d);
1147
1148                 /* we should now have things packed up, so lets send
1149                  * it off */
1150
1151                 s->init_num=n+4;
1152                 s->init_off=0;
1153                 }
1154
1155         /* SSL3_ST_SW_CERT_REQ_B */
1156         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1157 err:
1158         return(-1);
1159         }
1160
1161 static int ssl3_get_client_key_exchange(SSL *s)
1162         {
1163         int i,al,ok;
1164         long n;
1165         unsigned long l;
1166         unsigned char *p;
1167 #ifndef NO_RSA
1168         RSA *rsa=NULL;
1169         EVP_PKEY *pkey=NULL;
1170 #endif
1171 #ifndef NO_DH
1172         BIGNUM *pub=NULL;
1173         DH *dh_srvr;
1174 #endif
1175
1176         n=ssl3_get_message(s,
1177                 SSL3_ST_SR_KEY_EXCH_A,
1178                 SSL3_ST_SR_KEY_EXCH_B,
1179                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1180                 400, /* ???? */
1181                 &ok);
1182
1183         if (!ok) return((int)n);
1184         p=(unsigned char *)s->init_buf->data;
1185
1186         l=s->s3->tmp.new_cipher->algorithms;
1187
1188 #ifndef NO_RSA
1189         if (l & SSL_kRSA)
1190                 {
1191                 /* FIX THIS UP EAY EAY EAY EAY */
1192                 if (s->s3->tmp.use_rsa_tmp)
1193                         {
1194                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1195                                 rsa=s->cert->rsa_tmp;
1196                         /* Don't do a callback because rsa_tmp should
1197                          * be sent already */
1198                         if (rsa == NULL)
1199                                 {
1200                                 al=SSL_AD_HANDSHAKE_FAILURE;
1201                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1202                                 goto f_err;
1203
1204                                 }
1205                         }
1206                 else
1207                         {
1208                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1209                         if (    (pkey == NULL) ||
1210                                 (pkey->type != EVP_PKEY_RSA) ||
1211                                 (pkey->pkey.rsa == NULL))
1212                                 {
1213                                 al=SSL_AD_HANDSHAKE_FAILURE;
1214                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1215                                 goto f_err;
1216                                 }
1217                         rsa=pkey->pkey.rsa;
1218                         }
1219
1220                 /* TLS */
1221                 if (s->version > SSL3_VERSION)
1222                         {
1223                         n2s(p,i);
1224                         if (n != i+2)
1225                                 {
1226                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1227                                         {
1228                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1229                                         goto err;
1230                                         }
1231                                 else
1232                                         p-=2;
1233                                 }
1234                         else
1235                                 n=i;
1236                         }
1237
1238                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1239
1240 #if 1
1241                 /* If a bad decrypt, use a random master key */
1242                 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1243                         ((p[0] != (s->client_version>>8)) ||
1244                          (p[1] != (s->client_version & 0xff))))
1245                         {
1246                         int bad=1;
1247
1248                         if ((i == SSL_MAX_MASTER_KEY_LENGTH) &&
1249                                 (p[0] == (s->version>>8)) &&
1250                                 (p[1] == 0))
1251                                 {
1252                                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
1253                                         bad=0;
1254                                 }
1255                         if (bad)
1256                                 {
1257                                 p[0]=(s->version>>8);
1258                                 p[1]=(s->version & 0xff);
1259                                 RAND_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1260                                 i=SSL_MAX_MASTER_KEY_LENGTH;
1261                                 }
1262                         /* else, an SSLeay bug, ssl only server, tls client */
1263                         }
1264 #else
1265                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1266                         {
1267                         al=SSL_AD_DECODE_ERROR;
1268                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1269                         goto f_err;
1270                         }
1271
1272                 if ((p[0] != (s->version>>8)) || (p[1] != (s->version & 0xff)))
1273                         {
1274                         al=SSL_AD_DECODE_ERROR;
1275                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1276                         goto f_err;
1277                         }
1278 #endif
1279
1280                 s->session->master_key_length=
1281                         s->method->ssl3_enc->generate_master_secret(s,
1282                                 s->session->master_key,
1283                                 p,i);
1284                 memset(p,0,i);
1285                 }
1286         else
1287 #endif
1288 #ifndef NO_DH
1289                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1290                 {
1291                 n2s(p,i);
1292                 if (n != i+2)
1293                         {
1294                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1295                                 {
1296                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1297                                 goto err;
1298                                 }
1299                         else
1300                                 {
1301                                 p-=2;
1302                                 i=(int)n;
1303                                 }
1304                         }
1305
1306                 if (n == 0L) /* the parameters are in the cert */
1307                         {
1308                         al=SSL_AD_HANDSHAKE_FAILURE;
1309                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1310                         goto f_err;
1311                         }
1312                 else
1313                         {
1314                         if (s->s3->tmp.dh == NULL)
1315                                 {
1316                                 al=SSL_AD_HANDSHAKE_FAILURE;
1317                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1318                                 goto f_err;
1319                                 }
1320                         else
1321                                 dh_srvr=s->s3->tmp.dh;
1322                         }
1323
1324                 pub=BN_bin2bn(p,i,NULL);
1325                 if (pub == NULL)
1326                         {
1327                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1328                         goto err;
1329                         }
1330
1331                 i=DH_compute_key(p,pub,dh_srvr);
1332
1333                 if (i <= 0)
1334                         {
1335                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1336                         goto err;
1337                         }
1338
1339                 DH_free(s->s3->tmp.dh);
1340                 s->s3->tmp.dh=NULL;
1341
1342                 BN_clear_free(pub);
1343                 pub=NULL;
1344                 s->session->master_key_length=
1345                         s->method->ssl3_enc->generate_master_secret(s,
1346                                 s->session->master_key,p,i);
1347                 }
1348         else
1349 #endif
1350                 {
1351                 al=SSL_AD_HANDSHAKE_FAILURE;
1352                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1353                 goto f_err;
1354                 }
1355
1356         return(1);
1357 f_err:
1358         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1359 #if !defined(NO_DH) || !defined(NO_RSA)
1360 err:
1361 #endif
1362         return(-1);
1363         }
1364
1365 static int ssl3_get_cert_verify(SSL *s)
1366         {
1367         EVP_PKEY *pkey=NULL;
1368         unsigned char *p;
1369         int al,ok,ret=0;
1370         long n;
1371         int type=0,i,j;
1372         X509 *peer;
1373
1374         n=ssl3_get_message(s,
1375                 SSL3_ST_SR_CERT_VRFY_A,
1376                 SSL3_ST_SR_CERT_VRFY_B,
1377                 -1,
1378                 512, /* 512? */
1379                 &ok);
1380
1381         if (!ok) return((int)n);
1382
1383         if (s->session->peer != NULL)
1384                 {
1385                 peer=s->session->peer;
1386                 pkey=X509_get_pubkey(peer);
1387                 type=X509_certificate_type(peer,pkey);
1388                 }
1389         else
1390                 {
1391                 peer=NULL;
1392                 pkey=NULL;
1393                 }
1394
1395         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1396                 {
1397                 s->s3->tmp.reuse_message=1;
1398                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1399                         {
1400                         al=SSL_AD_UNEXPECTED_MESSAGE;
1401                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1402                         goto f_err;
1403                         }
1404                 ret=1;
1405                 goto end;
1406                 }
1407
1408         if (peer == NULL)
1409                 {
1410                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1411                 al=SSL_AD_UNEXPECTED_MESSAGE;
1412                 goto f_err;
1413                 }
1414
1415         if (!(type & EVP_PKT_SIGN))
1416                 {
1417                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1418                 al=SSL_AD_ILLEGAL_PARAMETER;
1419                 goto f_err;
1420                 }
1421
1422         if (s->s3->change_cipher_spec)
1423                 {
1424                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1425                 al=SSL_AD_UNEXPECTED_MESSAGE;
1426                 goto f_err;
1427                 }
1428
1429         /* we now have a signature that we need to verify */
1430         p=(unsigned char *)s->init_buf->data;
1431         n2s(p,i);
1432         n-=2;
1433         if (i > n)
1434                 {
1435                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1436                 al=SSL_AD_DECODE_ERROR;
1437                 goto f_err;
1438                 }
1439
1440         j=EVP_PKEY_size(pkey);
1441         if ((i > j) || (n > j) || (n <= 0))
1442                 {
1443                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1444                 al=SSL_AD_DECODE_ERROR;
1445                 goto f_err;
1446                 }
1447
1448 #ifndef NO_RSA
1449         if (pkey->type == EVP_PKEY_RSA)
1450                 {
1451                 i=RSA_public_decrypt(i,p,p,pkey->pkey.rsa,RSA_PKCS1_PADDING);
1452                 if (i < 0)
1453                         {
1454                         al=SSL_AD_DECRYPT_ERROR;
1455                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1456                         goto f_err;
1457                         }
1458                 if ((i != (MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH)) ||
1459                         memcmp(&(s->s3->tmp.finish_md[0]),p,
1460                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH))
1461                         {
1462                         al=SSL_AD_DECRYPT_ERROR;
1463                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1464                         goto f_err;
1465                         }
1466                 }
1467         else
1468 #endif
1469 #ifndef NO_DSA
1470                 if (pkey->type == EVP_PKEY_DSA)
1471                 {
1472                 j=DSA_verify(pkey->save_type,
1473                         &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]),
1474                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1475                 if (j <= 0)
1476                         {
1477                         /* bad signature */
1478                         al=SSL_AD_DECRYPT_ERROR;
1479                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1480                         goto f_err;
1481                         }
1482                 }
1483         else
1484 #endif
1485                 {
1486                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1487                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1488                 goto f_err;
1489                 }
1490
1491
1492         ret=1;
1493         if (0)
1494                 {
1495 f_err:
1496                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1497                 }
1498 end:
1499         EVP_PKEY_free(pkey);
1500         return(ret);
1501         }
1502
1503 static int ssl3_get_client_certificate(SSL *s)
1504         {
1505         int i,ok,al,ret= -1;
1506         X509 *x=NULL;
1507         unsigned long l,nc,llen,n;
1508         unsigned char *p,*d,*q;
1509         STACK_OF(X509) *sk=NULL;
1510
1511         n=ssl3_get_message(s,
1512                 SSL3_ST_SR_CERT_A,
1513                 SSL3_ST_SR_CERT_B,
1514                 -1,
1515 #if defined(MSDOS) && !defined(WIN32)
1516                 1024*30, /* 30k max cert list :-) */
1517 #else
1518                 1024*100, /* 100k max cert list :-) */
1519 #endif
1520                 &ok);
1521
1522         if (!ok) return((int)n);
1523
1524         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1525                 {
1526                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1527                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1528                         {
1529                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1530                         al=SSL_AD_HANDSHAKE_FAILURE;
1531                         goto f_err;
1532                         }
1533                 /* If tls asked for a client cert we must return a 0 list */
1534                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1535                         {
1536                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1537                         al=SSL_AD_UNEXPECTED_MESSAGE;
1538                         goto f_err;
1539                         }
1540                 s->s3->tmp.reuse_message=1;
1541                 return(1);
1542                 }
1543
1544         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1545                 {
1546                 al=SSL_AD_UNEXPECTED_MESSAGE;
1547                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1548                 goto f_err;
1549                 }
1550         d=p=(unsigned char *)s->init_buf->data;
1551
1552         if ((sk=sk_X509_new_null()) == NULL)
1553                 {
1554                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1555                 goto err;
1556                 }
1557
1558         n2l3(p,llen);
1559         if (llen+3 != n)
1560                 {
1561                 al=SSL_AD_DECODE_ERROR;
1562                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1563                 goto f_err;
1564                 }
1565         for (nc=0; nc<llen; )
1566                 {
1567                 n2l3(p,l);
1568                 if ((l+nc+3) > llen)
1569                         {
1570                         al=SSL_AD_DECODE_ERROR;
1571                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1572                         goto f_err;
1573                         }
1574
1575                 q=p;
1576                 x=d2i_X509(NULL,&p,l);
1577                 if (x == NULL)
1578                         {
1579                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1580                         goto err;
1581                         }
1582                 if (p != (q+l))
1583                         {
1584                         al=SSL_AD_DECODE_ERROR;
1585                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1586                         goto f_err;
1587                         }
1588                 if (!sk_X509_push(sk,x))
1589                         {
1590                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1591                         goto err;
1592                         }
1593                 x=NULL;
1594                 nc+=l+3;
1595                 }
1596
1597         if (sk_X509_num(sk) <= 0)
1598                 {
1599                 /* TLS does not mind 0 certs returned */
1600                 if (s->version == SSL3_VERSION)
1601                         {
1602                         al=SSL_AD_HANDSHAKE_FAILURE;
1603                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1604                         goto f_err;
1605                         }
1606                 /* Fail for TLS only if we required a certificate */
1607                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1608                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1609                         {
1610                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1611                         al=SSL_AD_HANDSHAKE_FAILURE;
1612                         goto f_err;
1613                         }
1614                 }
1615         else
1616                 {
1617                 i=ssl_verify_cert_chain(s,sk);
1618                 if (!i)
1619                         {
1620                         al=ssl_verify_alarm_type(s->verify_result);
1621                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1622                         goto f_err;
1623                         }
1624                 }
1625
1626         if (s->session->peer != NULL) /* This should not be needed */
1627                 X509_free(s->session->peer);
1628         s->session->peer=sk_X509_shift(sk);
1629
1630         /* With the current implementation, sess_cert will always be NULL
1631          * when we arrive here. */
1632         if (s->session->sess_cert == NULL)
1633                 {
1634                 s->session->sess_cert = ssl_sess_cert_new();
1635                 if (s->session->sess_cert == NULL)
1636                         {
1637                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1638                         goto err;
1639                         }
1640                 }
1641         if (s->session->sess_cert->cert_chain != NULL)
1642                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1643         s->session->sess_cert->cert_chain=sk;
1644
1645         sk=NULL;
1646
1647         ret=1;
1648         if (0)
1649                 {
1650 f_err:
1651                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1652                 }
1653 err:
1654         if (x != NULL) X509_free(x);
1655         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1656         return(ret);
1657         }
1658
1659 int ssl3_send_server_certificate(SSL *s)
1660         {
1661         unsigned long l;
1662         X509 *x;
1663
1664         if (s->state == SSL3_ST_SW_CERT_A)
1665                 {
1666                 x=ssl_get_server_send_cert(s);
1667                 if (x == NULL)
1668                         {
1669                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1670                         return(0);
1671                         }
1672
1673                 l=ssl3_output_cert_chain(s,x);
1674                 s->state=SSL3_ST_SW_CERT_B;
1675                 s->init_num=(int)l;
1676                 s->init_off=0;
1677                 }
1678
1679         /* SSL3_ST_SW_CERT_B */
1680         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1681         }