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 "buffer.h"
  63 #include "rand.h"
  64 #include "objects.h"
  65 #include "evp.h"
  66 #include "x509.h"
  67 #include "ssl_locl.h"
  68
  69 #define BREAK   break
  70 /* SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_MALLOC_FAILURE);
  71  * SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
  72  * SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
  73  * SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_MALLOC_FAILURE);
  74  * SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
  75  */
  76
  77 #ifndef NOPROTO
  78 static int ssl3_get_client_hello(SSL *s);
  79 static int ssl3_send_server_hello(SSL *s);
  80 static int ssl3_send_server_key_exchange(SSL *s);
  81 static int ssl3_send_certificate_request(SSL *s);
  82 static int ssl3_send_server_done(SSL *s);
  83 static int ssl3_get_cert_verify(SSL *s);
  84 static int ssl3_get_client_key_exchange(SSL *s);
  85 static int ssl3_get_client_certificate(SSL *s);
  86 static int ssl3_send_hello_request(SSL *s);
  87
  88 #else
  89
  90 static int ssl3_get_client_hello();
  91 static int ssl3_send_server_hello();
  92 static int ssl3_send_server_key_exchange();
  93 static int ssl3_send_certificate_request();
  94 static int ssl3_send_server_done();
  95 static int ssl3_get_cert_verify();
  96 static int ssl3_get_client_key_exchange();
  97 static int ssl3_get_client_certificate();
  98 static int ssl3_send_hello_request();
  99
 100 #endif
 101
 102 static SSL_METHOD *ssl3_get_server_method(ver)
 103 int ver;
 104         {
 105         if (ver == SSL3_VERSION)
 106                 return(SSLv3_server_method());
 107         else
 108                 return(NULL);
 109         }
 110
 111 SSL_METHOD *SSLv3_server_method()
 112         {
 113         static int init=1;
 114         static SSL_METHOD SSLv3_server_data;
 115
 116         if (init)
 117                 {
 118                 init=0;
 119                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 120                         sizeof(SSL_METHOD));
 121                 SSLv3_server_data.ssl_accept=ssl3_accept;
 122                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 123                 }
 124         return(&SSLv3_server_data);
 125         }
 126
 127 int ssl3_accept(s)
 128 SSL *s;
 129         {
 130         BUF_MEM *buf;
 131         unsigned long l,Time=time(NULL);
 132         void (*cb)()=NULL;
 133         long num1;
 134         int ret= -1;
 135         CERT *ct;
 136         BIO *under;
 137         int new_state,state,skip=0;
 138
 139         RAND_seed((unsigned char *)&Time,sizeof(Time));
 140         ERR_clear_error();
 141         clear_sys_error();
 142
 143         if (s->info_callback != NULL)
 144                 cb=s->info_callback;
 145         else if (s->ctx->info_callback != NULL)
 146                 cb=s->ctx->info_callback;
 147
 148         /* init things to blank */
 149         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 150         s->in_handshake++;
 151
 152 #ifdef undef
 153         /* FIX THIS EAY EAY EAY */
 154         /* we don't actually need a cert, we just need a cert or a DH_tmp */
 155         if (((s->session == NULL) || (s->session->cert == NULL)) &&
 156                 (s->cert == NULL))
 157                 {
 158                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 159                 ret= -1;
 160                 goto end;
 161                 }
 162 #endif
 163
 164         for (;;)
 165                 {
 166                 state=s->state;
 167
 168                 switch (s->state)
 169                         {
 170                 case SSL_ST_RENEGOTIATE:
 171                         s->new_session=1;
 172                         /* s->state=SSL_ST_ACCEPT; */
 173
 174                 case SSL_ST_BEFORE:
 175                 case SSL_ST_ACCEPT:
 176                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 177                 case SSL_ST_OK|SSL_ST_ACCEPT:
 178
 179                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 180
 181                         if ((s->version>>8) != 3)
 182                                 abort();
 183                         /* s->version=SSL3_VERSION; */
 184                         s->type=SSL_ST_ACCEPT;
 185
 186                         if (s->init_buf == NULL)
 187                                 {
 188                                 if ((buf=BUF_MEM_new()) == NULL)
 189                                         {
 190                                         ret= -1;
 191                                         goto end;
 192                                         }
 193                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 194                                         {
 195                                         ret= -1;
 196                                         goto end;
 197                                         }
 198                                 s->init_buf=buf;
 199                                 }
 200
 201                         if (!ssl3_setup_buffers(s))
 202                                 {
 203                                 ret= -1;
 204                                 goto end;
 205                                 }
 206
 207                         /* Ok, we now need to push on a buffering BIO so that
 208                          * the output is sent in a way that TCP likes :-)
 209                          */
 210                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 211
 212                         s->init_num=0;
 213
 214                         if (s->state != SSL_ST_RENEGOTIATE)
 215                                 {
 216                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 217                                 ssl3_init_finished_mac(s);
 218                                 s->ctx->sess_accept++;
 219                                 }
 220                         else
 221                                 {
 222                                 s->ctx->sess_accept_renegotiate++;
 223                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 224                                 }
 225                         break;
 226
 227                 case SSL3_ST_SW_HELLO_REQ_A:
 228                 case SSL3_ST_SW_HELLO_REQ_B:
 229
 230                         s->shutdown=0;
 231                         ret=ssl3_send_hello_request(s);
 232                         if (ret <= 0) goto end;
 233                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 234                         s->state=SSL3_ST_SW_FLUSH;
 235                         s->init_num=0;
 236
 237                         ssl3_init_finished_mac(s);
 238                         break;
 239
 240                 case SSL3_ST_SW_HELLO_REQ_C:
 241                         /* remove buffering on output */
 242                         under=BIO_pop(s->wbio);
 243                         if (under != NULL)
 244                                 s->wbio=under;
 245                         else
 246                                 abort(); /* ok */
 247                         BIO_free(s->bbio);
 248                         s->bbio=NULL;
 249
 250                         s->state=SSL_ST_OK;
 251                         ret=1;
 252                         goto end;
 253                         /* break; */
 254
 255                 case SSL3_ST_SR_CLNT_HELLO_A:
 256                 case SSL3_ST_SR_CLNT_HELLO_B:
 257                 case SSL3_ST_SR_CLNT_HELLO_C:
 258
 259                         s->shutdown=0;
 260                         ret=ssl3_get_client_hello(s);
 261                         if (ret <= 0) goto end;
 262                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 263                         s->init_num=0;
 264                         break;
 265
 266                 case SSL3_ST_SW_SRVR_HELLO_A:
 267                 case SSL3_ST_SW_SRVR_HELLO_B:
 268                         ret=ssl3_send_server_hello(s);
 269                         if (ret <= 0) goto end;
 270
 271                         if (s->hit)
 272                                 s->state=SSL3_ST_SW_CHANGE_A;
 273                         else
 274                                 s->state=SSL3_ST_SW_CERT_A;
 275                         s->init_num=0;
 276                         break;
 277
 278                 case SSL3_ST_SW_CERT_A:
 279                 case SSL3_ST_SW_CERT_B:
 280                         /* Check if it is anon DH */
 281                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 282                                 {
 283                                 ret=ssl3_send_server_certificate(s);
 284                                 if (ret <= 0) goto end;
 285                                 }
 286                         else
 287                                 skip=1;
 288                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 289                         s->init_num=0;
 290                         break;
 291
 292                 case SSL3_ST_SW_KEY_EXCH_A:
 293                 case SSL3_ST_SW_KEY_EXCH_B:
 294                         l=s->s3->tmp.new_cipher->algorithms;
 295                         if (s->session->cert == NULL)
 296                                 {
 297                                 if (s->cert != NULL)
 298                                         {
 299                                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 300                                         s->session->cert=s->cert;
 301                                         }
 302                                 else
 303                                         {
 304                                         CRYPTO_add(&s->ctx->default_cert->references,1,CRYPTO_LOCK_SSL_CERT);
 305                                         s->session->cert=s->ctx->default_cert;
 306                                         }
 307                                 }
 308                         ct=s->session->cert;
 309
 310                         /* clear this, it may get reset by
 311                          * send_server_key_exchange */
 312                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 313                                 s->s3->tmp.use_rsa_tmp=1;
 314                         else
 315                                 s->s3->tmp.use_rsa_tmp=0;
 316
 317                         /* only send if a DH key exchange, fortezza or
 318                          * RSA but we have a sign only certificate */
 319                         if ( s->s3->tmp.use_rsa_tmp ||
 320                             (l & (SSL_DH|SSL_kFZA)) ||
 321                             ((l & SSL_kRSA) &&
 322                              ((ct->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)||
 323                               ((l & SSL_EXPORT) &&
 324                                (EVP_PKEY_size(ct->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > 512)
 325                               )
 326                              )
 327                             )
 328                            )
 329                                 {
 330                                 ret=ssl3_send_server_key_exchange(s);
 331                                 if (ret <= 0) goto end;
 332                                 }
 333                         else
 334                                 skip=1;
 335
 336                         s->state=SSL3_ST_SW_CERT_REQ_A;
 337                         s->init_num=0;
 338                         break;
 339
 340                 case SSL3_ST_SW_CERT_REQ_A:
 341                 case SSL3_ST_SW_CERT_REQ_B:
 342                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 343                                 ((s->session->peer != NULL) &&
 344                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 345                                 {
 346                                 /* no cert request */
 347                                 skip=1;
 348                                 s->s3->tmp.cert_request=0;
 349                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 350                                 }
 351                         else
 352                                 {
 353                                 s->s3->tmp.cert_request=1;
 354                                 ret=ssl3_send_certificate_request(s);
 355                                 if (ret <= 0) goto end;
 356                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 357                                 s->init_num=0;
 358                                 }
 359                         break;
 360
 361                 case SSL3_ST_SW_SRVR_DONE_A:
 362                 case SSL3_ST_SW_SRVR_DONE_B:
 363                         ret=ssl3_send_server_done(s);
 364                         if (ret <= 0) goto end;
 365                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 366                         s->state=SSL3_ST_SW_FLUSH;
 367                         s->init_num=0;
 368                         break;
 369
 370                 case SSL3_ST_SW_FLUSH:
 371                         /* number of bytes to be flushed */
 372                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 373                         if (num1 > 0)
 374                                 {
 375                                 s->rwstate=SSL_WRITING;
 376                                 num1=BIO_flush(s->wbio);
 377                                 if (num1 <= 0) { ret= -1; goto end; }
 378                                 s->rwstate=SSL_NOTHING;
 379                                 }
 380
 381                         s->state=s->s3->tmp.next_state;
 382                         break;
 383
 384                 case SSL3_ST_SR_CERT_A:
 385                 case SSL3_ST_SR_CERT_B:
 386                         /* could be sent for a DH cert, even if we
 387                          * have not asked for it :-) */
 388                         ret=ssl3_get_client_certificate(s);
 389                         if (ret <= 0) goto end;
 390                         s->init_num=0;
 391                         s->state=SSL3_ST_SR_KEY_EXCH_A;
 392                         break;
 393
 394                 case SSL3_ST_SR_KEY_EXCH_A:
 395                 case SSL3_ST_SR_KEY_EXCH_B:
 396                         ret=ssl3_get_client_key_exchange(s);
 397                         if (ret <= 0) goto end;
 398                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 399                         s->init_num=0;
 400
 401                         /* We need to get hashes here so if there is
 402                          * a client cert, it can be verified */
 403                         s->method->ssl3_enc->cert_verify_mac(s,
 404                                 &(s->s3->finish_dgst1),
 405                                 &(s->s3->tmp.finish_md[0]));
 406                         s->method->ssl3_enc->cert_verify_mac(s,
 407                                 &(s->s3->finish_dgst2),
 408                                 &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]));
 409
 410                         break;
 411
 412                 case SSL3_ST_SR_CERT_VRFY_A:
 413                 case SSL3_ST_SR_CERT_VRFY_B:
 414
 415                         /* we should decide if we expected this one */
 416                         ret=ssl3_get_cert_verify(s);
 417                         if (ret <= 0) goto end;
 418
 419                         s->state=SSL3_ST_SR_FINISHED_A;
 420                         s->init_num=0;
 421                         break;
 422
 423                 case SSL3_ST_SR_FINISHED_A:
 424                 case SSL3_ST_SR_FINISHED_B:
 425                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 426                                 SSL3_ST_SR_FINISHED_B);
 427                         if (ret <= 0) goto end;
 428                         if (s->hit)
 429                                 s->state=SSL_ST_OK;
 430                         else
 431                                 s->state=SSL3_ST_SW_CHANGE_A;
 432                         s->init_num=0;
 433                         break;
 434
 435                 case SSL3_ST_SW_CHANGE_A:
 436                 case SSL3_ST_SW_CHANGE_B:
 437
 438                         s->session->cipher=s->s3->tmp.new_cipher;
 439                         if (!s->method->ssl3_enc->setup_key_block(s))
 440                                 { ret= -1; goto end; }
 441
 442                         ret=ssl3_send_change_cipher_spec(s,
 443                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 444
 445                         if (ret <= 0) goto end;
 446                         s->state=SSL3_ST_SW_FINISHED_A;
 447                         s->init_num=0;
 448
 449                         if (!s->method->ssl3_enc->change_cipher_state(s,
 450                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 451                                 {
 452                                 ret= -1;
 453                                 goto end;
 454                                 }
 455
 456                         break;
 457
 458                 case SSL3_ST_SW_FINISHED_A:
 459                 case SSL3_ST_SW_FINISHED_B:
 460                         ret=ssl3_send_finished(s,
 461                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 462                                 s->method->ssl3_enc->server_finished,
 463                                 s->method->ssl3_enc->server_finished_len);
 464                         if (ret <= 0) goto end;
 465                         s->state=SSL3_ST_SW_FLUSH;
 466                         if (s->hit)
 467                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 468                         else
 469                                 s->s3->tmp.next_state=SSL_ST_OK;
 470                         s->init_num=0;
 471                         break;
 472
 473                 case SSL_ST_OK:
 474                         /* clean a few things up */
 475                         ssl3_cleanup_key_block(s);
 476
 477                         BUF_MEM_free(s->init_buf);
 478                         s->init_buf=NULL;
 479
 480                         /* remove buffering on output */
 481                         under=BIO_pop(s->wbio);
 482                         if (under != NULL)
 483                                 s->wbio=under;
 484                         else
 485                                 abort(); /* ok */
 486                         BIO_free(s->bbio);
 487                         s->bbio=NULL;
 488
 489                         s->new_session=0;
 490                         s->init_num=0;
 491
 492                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 493
 494                         s->ctx->sess_accept_good++;
 495                         /* s->server=1; */
 496                         s->handshake_func=ssl3_accept;
 497                         ret=1;
 498
 499                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 500
 501                         goto end;
 502                         /* break; */
 503
 504                 default:
 505                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 506                         ret= -1;
 507                         goto end;
 508                         /* break; */
 509                         }
 510
 511                 if (!s->s3->tmp.reuse_message && !skip)
 512                         {
 513                         if (s->debug)
 514                                 {
 515                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 516                                         goto end;
 517                                 }
 518
 519
 520                         if ((cb != NULL) && (s->state != state))
 521                                 {
 522                                 new_state=s->state;
 523                                 s->state=state;
 524                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 525                                 s->state=new_state;
 526                                 }
 527                         }
 528                 skip=0;
 529                 }
 530 end:
 531         /* BIO_flush(s->wbio); */
 532
 533         if (cb != NULL)
 534                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 535         s->in_handshake--;
 536         return(ret);
 537         }
 538
 539 static int ssl3_send_hello_request(s)
 540 SSL *s;
 541         {
 542         unsigned char *p;
 543
 544         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 545                 {
 546                 p=(unsigned char *)s->init_buf->data;
 547                 *(p++)=SSL3_MT_CLIENT_REQUEST;
 548                 *(p++)=0;
 549                 *(p++)=0;
 550                 *(p++)=0;
 551
 552                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 553                 /* number of bytes to write */
 554                 s->init_num=4;
 555                 s->init_off=0;
 556                 }
 557
 558         /* SSL3_ST_SW_HELLO_REQ_B */
 559         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 560         }
 561
 562 static int ssl3_get_client_hello(s)
 563 SSL *s;
 564         {
 565         int i,j,ok,al,ret= -1;
 566         long n;
 567         unsigned long id;
 568         unsigned char *p,*d;
 569         SSL_CIPHER *c;
 570         STACK *ciphers=NULL;
 571
 572         /* We do this so that we will respond with our native type.
 573          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 574          * This down switching should be handled by a different method.
 575          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 576          * TLSv1.
 577          */
 578         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 579                 {
 580                 s->first_packet=1;
 581                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 582                 }
 583         n=ssl3_get_message(s,
 584                 SSL3_ST_SR_CLNT_HELLO_B,
 585                 SSL3_ST_SR_CLNT_HELLO_C,
 586                 SSL3_MT_CLIENT_HELLO,
 587                 SSL3_RT_MAX_PLAIN_LENGTH,
 588                 &ok);
 589
 590         if (!ok) return((int)n);
 591         d=p=(unsigned char *)s->init_buf->data;
 592
 593         /* The version number has already been checked in ssl3_get_message.
 594          * I a native TLSv1/SSLv3 method, the match must be correct except
 595          * perhaps for the first message */
 596         p+=2;
 597
 598         /* load the client random */
 599         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 600         p+=SSL3_RANDOM_SIZE;
 601
 602         /* get the session-id */
 603         j= *(p++);
 604
 605         s->hit=0;
 606         if (j == 0)
 607                 {
 608                 if (!ssl_get_new_session(s,1))
 609                         goto err;
 610                 }
 611         else
 612                 {
 613                 i=ssl_get_prev_session(s,p,j);
 614                 if (i == 1)
 615                         { /* previous session */
 616                         s->hit=1;
 617                         }
 618                 else
 619                         {
 620                         if (!ssl_get_new_session(s,1))
 621                                 goto err;
 622                         }
 623                 }
 624
 625         p+=j;
 626         n2s(p,i);
 627         if ((i == 0) && (j != 0))
 628                 {
 629                 /* we need a cipher if we are not resuming a session */
 630                 al=SSL_AD_ILLEGAL_PARAMETER;
 631                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 632                 goto f_err;
 633                 }
 634         if ((i+p) > (d+n))
 635                 {
 636                 /* not enough data */
 637                 al=SSL_AD_DECODE_ERROR;
 638                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 639                 goto f_err;
 640                 }
 641         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 642                 == NULL))
 643                 {
 644                 goto err;
 645                 }
 646         p+=i;
 647
 648         /* If it is a hit, check that the cipher is in the list */
 649         if ((s->hit) && (i > 0))
 650                 {
 651                 j=0;
 652                 id=s->session->cipher->id;
 653
 654                 for (i=0; i<sk_num(ciphers); i++)
 655                         {
 656                         c=(SSL_CIPHER *)sk_value(ciphers,i);
 657                         if (c->id == id)
 658                                 {
 659                                 j=1;
 660                                 break;
 661                                 }
 662                         }
 663                 if (j == 0)
 664                         {
 665                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_num(ciphers) == 1))
 666                                 {
 667                                 /* Very bad for multi-threading.... */
 668                                 s->session->cipher=
 669                                         (SSL_CIPHER *)sk_value(ciphers,0);
 670                                 }
 671                         else
 672                                 {
 673                                 /* we need to have the cipher in the cipher
 674                                  * list if we are asked to reuse it */
 675                                 al=SSL_AD_ILLEGAL_PARAMETER;
 676                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 677                                 goto f_err;
 678                                 }
 679                         }
 680                 }
 681
 682         /* compression */
 683         i= *(p++);
 684         for (j=0; j<i; j++)
 685                 if (p[j] == 0) break;
 686
 687         p+=i;
 688         if (j >= i)
 689                 {
 690                 /* no compress */
 691                 al=SSL_AD_DECODE_ERROR;
 692                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 693                 goto f_err;
 694                 }
 695
 696         /* TLS does not mind if there is extra stuff */
 697         if (s->version == SSL3_VERSION)
 698                 {
 699                 if (p > (d+n))
 700                         {
 701                         /* wrong number of bytes,
 702                          * there could be more to follow */
 703                         al=SSL_AD_DECODE_ERROR;
 704                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 705                         goto f_err;
 706                         }
 707                 }
 708
 709         /* do nothing with compression */
 710
 711         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 712          * pick a cipher */
 713
 714         if (!s->hit)
 715                 {
 716                 if (s->session->ciphers != NULL)
 717                         sk_free(s->session->ciphers);
 718                 s->session->ciphers=ciphers;
 719                 if (ciphers == NULL)
 720                         {
 721                         al=SSL_AD_ILLEGAL_PARAMETER;
 722                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 723                         goto f_err;
 724                         }
 725                 ciphers=NULL;
 726                 c=ssl3_choose_cipher(s,s->session->ciphers,
 727                         ssl_get_ciphers_by_id(s));
 728
 729                 if (c == NULL)
 730                         {
 731                         al=SSL_AD_HANDSHAKE_FAILURE;
 732                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 733                         goto f_err;
 734                         }
 735                 s->s3->tmp.new_cipher=c;
 736                 }
 737         else
 738                 {
 739                 /* Session-id reuse */
 740 #ifdef REUSE_CIPHER_BUG
 741                 STACK *sk;
 742                 SSL_CIPHER *nc=NULL;
 743                 SSL_CIPHER *ec=NULL;
 744
 745                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 746                         {
 747                         sk=s->session->ciphers;
 748                         for (i=0; i<sk_num(sk); i++)
 749                                 {
 750                                 c=(SSL_CIPHER *)sk_value(sk,i);
 751                                 if (c->algorithms & SSL_eNULL)
 752                                         nc=c;
 753                                 if (c->algorithms & SSL_EXP)
 754                                         ec=c;
 755                                 }
 756                         if (nc != NULL)
 757                                 s->s3->tmp.new_cipher=nc;
 758                         else if (ec != NULL)
 759                                 s->s3->tmp.new_cipher=ec;
 760                         else
 761                                 s->s3->tmp.new_cipher=s->session->cipher;
 762                         }
 763                 else
 764 #endif
 765                 s->s3->tmp.new_cipher=s->session->cipher;
 766                 }
 767
 768         /* we now have the following setup.
 769          * client_random
 770          * cipher_list          - our prefered list of ciphers
 771          * ciphers              - the clients prefered list of ciphers
 772          * compression          - basically ignored right now
 773          * ssl version is set   - sslv3
 774          * s->session           - The ssl session has been setup.
 775          * s->hit               - sesson reuse flag
 776          * s->tmp.new_cipher    - the new cipher to use.
 777          */
 778
 779         ret=1;
 780         if (0)
 781                 {
 782 f_err:
 783                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 784                 }
 785 err:
 786         if (ciphers != NULL) sk_free(ciphers);
 787         return(ret);
 788         }
 789
 790 static int ssl3_send_server_hello(s)
 791 SSL *s;
 792         {
 793         unsigned char *buf;
 794         unsigned char *p,*d;
 795         int i,sl;
 796         unsigned long l,Time;
 797
 798         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 799                 {
 800                 buf=(unsigned char *)s->init_buf->data;
 801                 p=s->s3->server_random;
 802                 Time=time(NULL);                        /* Time */
 803                 l2n(Time,p);
 804                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 805                 /* Do the message type and length last */
 806                 d=p= &(buf[4]);
 807
 808                 *(p++)=s->version>>8;
 809                 *(p++)=s->version&0xff;
 810
 811                 /* Random stuff */
 812                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 813                 p+=SSL3_RANDOM_SIZE;
 814
 815                 /* now in theory we have 3 options to sending back the
 816                  * session id.  If it is a re-use, we send back the
 817                  * old session-id, if it is a new session, we send
 818                  * back the new session-id or we send back a 0 length
 819                  * session-id if we want it to be single use.
 820                  * Currently I will not implement the '0' length session-id
 821                  * 12-Jan-98 - I'll now support the '0' length stuff.
 822                  */
 823                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 824                         s->session->session_id_length=0;
 825
 826                 sl=s->session->session_id_length;
 827                 *(p++)=sl;
 828                 memcpy(p,s->session->session_id,sl);
 829                 p+=sl;
 830
 831                 /* put the cipher */
 832                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 833                 p+=i;
 834
 835                 /* put the compression method */
 836                 *(p++)=0;
 837
 838                 /* do the header */
 839                 l=(p-d);
 840                 d=buf;
 841                 *(d++)=SSL3_MT_SERVER_HELLO;
 842                 l2n3(l,d);
 843
 844                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 845                 /* number of bytes to write */
 846                 s->init_num=p-buf;
 847                 s->init_off=0;
 848                 }
 849
 850         /* SSL3_ST_CW_CLNT_HELLO_B */
 851         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 852         }
 853
 854 static int ssl3_send_server_done(s)
 855 SSL *s;
 856         {
 857         unsigned char *p;
 858
 859         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 860                 {
 861                 p=(unsigned char *)s->init_buf->data;
 862
 863                 /* do the header */
 864                 *(p++)=SSL3_MT_SERVER_DONE;
 865                 *(p++)=0;
 866                 *(p++)=0;
 867                 *(p++)=0;
 868
 869                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 870                 /* number of bytes to write */
 871                 s->init_num=4;
 872                 s->init_off=0;
 873                 }
 874
 875         /* SSL3_ST_CW_CLNT_HELLO_B */
 876         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 877         }
 878
 879 static int ssl3_send_server_key_exchange(s)
 880 SSL *s;
 881         {
 882 #ifndef NO_RSA
 883         unsigned char *q;
 884         int j,num;
 885         RSA *rsa;
 886         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 887 #endif
 888 #ifndef NO_DH
 889         DH *dh,*dhp;
 890 #endif
 891         EVP_PKEY *pkey;
 892         unsigned char *p,*d;
 893         int al,i;
 894         unsigned long type;
 895         int n;
 896         CERT *cert;
 897         BIGNUM *r[4];
 898         int nr[4],kn;
 899         BUF_MEM *buf;
 900         EVP_MD_CTX md_ctx;
 901
 902         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 903                 {
 904                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 905                 cert=s->session->cert;
 906
 907                 buf=s->init_buf;
 908
 909                 r[0]=r[1]=r[2]=r[3]=NULL;
 910                 n=0;
 911 #ifndef NO_RSA
 912                 if (type & SSL_kRSA)
 913                         {
 914                         rsa=cert->rsa_tmp;
 915                         if ((rsa == NULL) && (s->ctx->default_cert->rsa_tmp_cb != NULL))
 916                                 {
 917                                 rsa=s->ctx->default_cert->rsa_tmp_cb(s,
 918                                         (s->s3->tmp.new_cipher->algorithms|
 919                                         SSL_NOT_EXP)?0:1);
 920                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 921                                 cert->rsa_tmp=rsa;
 922                                 }
 923                         if (rsa == NULL)
 924                                 {
 925                                 al=SSL_AD_HANDSHAKE_FAILURE;
 926                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 927                                 goto f_err;
 928                                 }
 929                         r[0]=rsa->n;
 930                         r[1]=rsa->e;
 931                         s->s3->tmp.use_rsa_tmp=1;
 932                         }
 933                 else
 934 #endif
 935 #ifndef NO_DH
 936                         if (type & SSL_kEDH)
 937                         {
 938                         dhp=cert->dh_tmp;
 939                         if ((dhp == NULL) && (cert->dh_tmp_cb != NULL))
 940                                 dhp=cert->dh_tmp_cb(s,
 941                                         (s->s3->tmp.new_cipher->algorithms|
 942                                         SSL_NOT_EXP)?0:1);
 943                         if (dhp == NULL)
 944                                 {
 945                                 al=SSL_AD_HANDSHAKE_FAILURE;
 946                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 947                                 goto f_err;
 948                                 }
 949                         if ((dh=DHparams_dup(dhp)) == NULL)
 950                                 {
 951                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 952                                 goto err;
 953                                 }
 954
 955                         s->s3->tmp.dh=dh;
 956                         if (((dhp->pub_key == NULL) ||
 957                              (dhp->priv_key == NULL) ||
 958                              (s->options & SSL_OP_SINGLE_DH_USE)) &&
 959                             (!DH_generate_key(dh)))
 960                                 {
 961                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 962                                 goto err;
 963                                 }
 964                         else
 965                                 {
 966                                 dh->pub_key=BN_dup(dhp->pub_key);
 967                                 dh->priv_key=BN_dup(dhp->priv_key);
 968                                 if ((dh->pub_key == NULL) ||
 969                                         (dh->priv_key == NULL))
 970                                         {
 971                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 972                                         goto err;
 973                                         }
 974                                 }
 975                         r[0]=dh->p;
 976                         r[1]=dh->g;
 977                         r[2]=dh->pub_key;
 978                         }
 979                 else
 980 #endif
 981                         {
 982                         al=SSL_AD_HANDSHAKE_FAILURE;
 983                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 984                         goto f_err;
 985                         }
 986                 for (i=0; r[i] != NULL; i++)
 987                         {
 988                         nr[i]=BN_num_bytes(r[i]);
 989                         n+=2+nr[i];
 990                         }
 991
 992                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 993                         {
 994                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 995                                 == NULL)
 996                                 {
 997                                 al=SSL_AD_DECODE_ERROR;
 998                                 goto f_err;
 999                                 }
1000                         kn=EVP_PKEY_size(pkey);
1001                         }
1002                 else
1003                         {
1004                         pkey=NULL;
1005                         kn=0;
1006                         }
1007
1008                 if (!BUF_MEM_grow(buf,n+4+kn))
1009                         {
1010                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1011                         goto err;
1012                         }
1013                 d=(unsigned char *)s->init_buf->data;
1014                 p= &(d[4]);
1015
1016                 for (i=0; r[i] != NULL; i++)
1017                         {
1018                         s2n(nr[i],p);
1019                         BN_bn2bin(r[i],p);
1020                         p+=nr[i];
1021                         }
1022
1023                 /* not anonymous */
1024                 if (pkey != NULL)
1025                         {
1026                         /* n is the length of the params, they start at &(d[4])
1027                          * and p points to the space at the end. */
1028 #ifndef NO_RSA
1029                         if (pkey->type == EVP_PKEY_RSA)
1030                                 {
1031                                 q=md_buf;
1032                                 j=0;
1033                                 for (num=2; num > 0; num--)
1034                                         {
1035                                         EVP_DigestInit(&md_ctx,(num == 2)
1036                                                 ?s->ctx->md5:s->ctx->sha1);
1037                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1038                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1039                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1040                                         EVP_DigestFinal(&md_ctx,q,
1041                                                 (unsigned int *)&i);
1042                                         q+=i;
1043                                         j+=i;
1044                                         }
1045                                 i=RSA_private_encrypt(j,md_buf,&(p[2]),
1046                                         pkey->pkey.rsa,RSA_PKCS1_PADDING);
1047                                 if (i <= 0)
1048                                         {
1049                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1050                                         goto err;
1051                                         }
1052                                 s2n(i,p);
1053                                 n+=i+2;
1054                                 }
1055                         else
1056 #endif
1057 #if !defined(NO_DSA)
1058                                 if (pkey->type == EVP_PKEY_DSA)
1059                                 {
1060                                 /* lets do DSS */
1061                                 EVP_SignInit(&md_ctx,EVP_dss1());
1062                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1063                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1064                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1065                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1066                                         (unsigned int *)&i,pkey))
1067                                         {
1068                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1069                                         goto err;
1070                                         }
1071                                 s2n(i,p);
1072                                 n+=i+2;
1073                                 }
1074                         else
1075 #endif
1076                                 {
1077                                 /* Is this error check actually needed? */
1078                                 al=SSL_AD_HANDSHAKE_FAILURE;
1079                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1080                                 goto f_err;
1081                                 }
1082                         }
1083
1084                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1085                 l2n3(n,d);
1086
1087                 /* we should now have things packed up, so lets send
1088                  * it off */
1089                 s->init_num=n+4;
1090                 s->init_off=0;
1091                 }
1092
1093         /* SSL3_ST_SW_KEY_EXCH_B */
1094         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1095 f_err:
1096         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1097 err:
1098         return(-1);
1099         }
1100
1101 static int ssl3_send_certificate_request(s)
1102 SSL *s;
1103         {
1104         unsigned char *p,*d;
1105         int i,j,nl,off,n;
1106         STACK *sk=NULL;
1107         X509_NAME *name;
1108         BUF_MEM *buf;
1109
1110         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1111                 {
1112                 buf=s->init_buf;
1113
1114                 d=p=(unsigned char *)&(buf->data[4]);
1115
1116                 /* get the list of acceptable cert types */
1117                 p++;
1118                 n=ssl3_get_req_cert_type(s,p);
1119                 d[0]=n;
1120                 p+=n;
1121                 n++;
1122
1123                 off=n;
1124                 p+=2;
1125                 n+=2;
1126
1127                 sk=SSL_get_client_CA_list(s);
1128                 nl=0;
1129                 if (sk != NULL)
1130                         {
1131                         for (i=0; i<sk_num(sk); i++)
1132                                 {
1133                                 name=(X509_NAME *)sk_value(sk,i);
1134                                 j=i2d_X509_NAME(name,NULL);
1135                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1136                                         {
1137                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1138                                         goto err;
1139                                         }
1140                                 p=(unsigned char *)&(buf->data[4+n]);
1141                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1142                                         {
1143                                         s2n(j,p);
1144                                         i2d_X509_NAME(name,&p);
1145                                         n+=2+j;
1146                                         nl+=2+j;
1147                                         }
1148                                 else
1149                                         {
1150                                         d=p;
1151                                         i2d_X509_NAME(name,&p);
1152                                         j-=2; s2n(j,d); j+=2;
1153                                         n+=j;
1154                                         nl+=j;
1155                                         }
1156                                 }
1157                         }
1158                 /* else no CA names */
1159                 p=(unsigned char *)&(buf->data[4+off]);
1160                 s2n(nl,p);
1161
1162                 d=(unsigned char *)buf->data;
1163                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1164                 l2n3(n,d);
1165
1166                 /* we should now have things packed up, so lets send
1167                  * it off */
1168
1169                 s->init_num=n+4;
1170                 s->init_off=0;
1171                 }
1172
1173         /* SSL3_ST_SW_CERT_REQ_B */
1174         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1175 err:
1176         return(-1);
1177         }
1178
1179 static int ssl3_get_client_key_exchange(s)
1180 SSL *s;
1181         {
1182         int i,al,ok;
1183         long n;
1184         unsigned long l;
1185         unsigned char *p;
1186         RSA *rsa=NULL;
1187         EVP_PKEY *pkey=NULL;
1188 #ifndef NO_DH
1189         BIGNUM *pub=NULL;
1190         DH *dh_srvr;
1191 #endif
1192
1193         n=ssl3_get_message(s,
1194                 SSL3_ST_SR_KEY_EXCH_A,
1195                 SSL3_ST_SR_KEY_EXCH_B,
1196                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1197                 400, /* ???? */
1198                 &ok);
1199
1200         if (!ok) return((int)n);
1201         p=(unsigned char *)s->init_buf->data;
1202
1203         l=s->s3->tmp.new_cipher->algorithms;
1204
1205 #ifndef NO_RSA
1206         if (l & SSL_kRSA)
1207                 {
1208                 /* FIX THIS UP EAY EAY EAY EAY */
1209                 if (s->s3->tmp.use_rsa_tmp)
1210                         {
1211                         if ((s->session->cert != NULL) &&
1212                                 (s->session->cert->rsa_tmp != NULL))
1213                                 rsa=s->session->cert->rsa_tmp;
1214                         else if ((s->ctx->default_cert != NULL) &&
1215                                 (s->ctx->default_cert->rsa_tmp != NULL))
1216                                 rsa=s->ctx->default_cert->rsa_tmp;
1217                         /* Don't do a callback because rsa_tmp should
1218                          * be sent already */
1219                         if (rsa == NULL)
1220                                 {
1221                                 al=SSL_AD_HANDSHAKE_FAILURE;
1222                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1223                                 goto f_err;
1224
1225                                 }
1226                         }
1227                 else
1228                         {
1229                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1230                         if (    (pkey == NULL) ||
1231                                 (pkey->type != EVP_PKEY_RSA) ||
1232                                 (pkey->pkey.rsa == NULL))
1233                                 {
1234                                 al=SSL_AD_HANDSHAKE_FAILURE;
1235                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1236                                 goto f_err;
1237                                 }
1238                         rsa=pkey->pkey.rsa;
1239                         }
1240
1241                 /* TLS */
1242                 if (s->version > SSL3_VERSION)
1243                         {
1244                         n2s(p,i);
1245                         if (n != i+2)
1246                                 {
1247                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1248                                         {
1249                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1250                                         goto err;
1251                                         }
1252                                 else
1253                                         p-=2;
1254                                 }
1255                         else
1256                                 n=i;
1257                         }
1258
1259                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1260
1261 #if 1
1262                 /* If a bad decrypt, use a random master key */
1263                 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1264                         ((p[0] != (s->version>>8)) ||
1265                          (p[1] != (s->version & 0xff))))
1266                         {
1267                         p[0]=(s->version>>8);
1268                         p[1]=(s->version & 0xff);
1269                         RAND_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1270                         i=SSL_MAX_MASTER_KEY_LENGTH;
1271                         }
1272 #else
1273                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1274                         {
1275                         al=SSL_AD_DECODE_ERROR;
1276                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1277                         goto f_err;
1278                         }
1279
1280                 if ((p[0] != (s->version>>8)) || (p[1] != (s->version & 0xff)))
1281                         {
1282                         al=SSL_AD_DECODE_ERROR;
1283                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1284                         goto f_err;
1285                         }
1286 #endif
1287
1288                 s->session->master_key_length=
1289                         s->method->ssl3_enc->generate_master_secret(s,
1290                                 s->session->master_key,
1291                                 p,i);
1292                 memset(p,0,i);
1293                 }
1294         else
1295 #endif
1296 #ifndef NO_DH
1297                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1298                 {
1299                 n2s(p,i);
1300                 if (n != i+2)
1301                         {
1302                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1303                                 {
1304                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1305                                 goto err;
1306                                 }
1307                         else
1308                                 {
1309                                 p-=2;
1310                                 i=(int)n;
1311                                 }
1312                         }
1313
1314                 if (n == 0L) /* the parameters are in the cert */
1315                         {
1316                         al=SSL_AD_HANDSHAKE_FAILURE;
1317                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1318                         goto f_err;
1319                         }
1320                 else
1321                         {
1322                         if (s->s3->tmp.dh == NULL)
1323                                 {
1324                                 al=SSL_AD_HANDSHAKE_FAILURE;
1325                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1326                                 goto f_err;
1327                                 }
1328                         else
1329                                 dh_srvr=s->s3->tmp.dh;
1330                         }
1331
1332                 pub=BN_bin2bn(p,i,NULL);
1333                 if (pub == NULL)
1334                         {
1335                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1336                         goto err;
1337                         }
1338
1339                 i=DH_compute_key(p,pub,dh_srvr);
1340
1341                 if (i <= 0)
1342                         {
1343                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1344                         goto err;
1345                         }
1346
1347                 DH_free(s->s3->tmp.dh);
1348                 s->s3->tmp.dh=NULL;
1349
1350                 BN_clear_free(pub);
1351                 pub=NULL;
1352                 s->session->master_key_length=
1353                         s->method->ssl3_enc->generate_master_secret(s,
1354                                 s->session->master_key,p,i);
1355                 }
1356         else
1357 #endif
1358                 {
1359                 al=SSL_AD_HANDSHAKE_FAILURE;
1360                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1361                 goto f_err;
1362                 }
1363
1364         return(1);
1365 f_err:
1366         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1367 #if !defined(NO_DH) || !defined(NO_RSA)
1368 err:
1369 #endif
1370         return(-1);
1371         }
1372
1373 static int ssl3_get_cert_verify(s)
1374 SSL *s;
1375         {
1376         EVP_PKEY *pkey=NULL;
1377         unsigned char *p;
1378         int al,ok,ret=0;
1379         long n;
1380         int type=0,i,j;
1381         X509 *peer;
1382
1383         n=ssl3_get_message(s,
1384                 SSL3_ST_SR_CERT_VRFY_A,
1385                 SSL3_ST_SR_CERT_VRFY_B,
1386                 -1,
1387                 512, /* 512? */
1388                 &ok);
1389
1390         if (!ok) return((int)n);
1391
1392         if (s->session->peer != NULL)
1393                 {
1394                 peer=s->session->peer;
1395                 pkey=X509_get_pubkey(peer);
1396                 type=X509_certificate_type(peer,pkey);
1397                 }
1398         else
1399                 {
1400                 peer=NULL;
1401                 pkey=NULL;
1402                 }
1403
1404         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1405                 {
1406                 s->s3->tmp.reuse_message=1;
1407                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1408                         {
1409                         al=SSL_AD_UNEXPECTED_MESSAGE;
1410                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1411                         goto f_err;
1412                         }
1413                 ret=1;
1414                 goto end;
1415                 }
1416
1417         if (peer == NULL)
1418                 {
1419                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1420                 al=SSL_AD_UNEXPECTED_MESSAGE;
1421                 goto f_err;
1422                 }
1423
1424         if (!(type & EVP_PKT_SIGN))
1425                 {
1426                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1427                 al=SSL_AD_ILLEGAL_PARAMETER;
1428                 goto f_err;
1429                 }
1430
1431         if (s->s3->change_cipher_spec)
1432                 {
1433                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1434                 al=SSL_AD_UNEXPECTED_MESSAGE;
1435                 goto f_err;
1436                 }
1437
1438         /* we now have a signature that we need to verify */
1439         p=(unsigned char *)s->init_buf->data;
1440         n2s(p,i);
1441         n-=2;
1442         if (i > n)
1443                 {
1444                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1445                 al=SSL_AD_DECODE_ERROR;
1446                 goto f_err;
1447                 }
1448
1449         j=EVP_PKEY_size(pkey);
1450         if ((i > j) || (n > j) || (n <= 0))
1451                 {
1452                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1453                 al=SSL_AD_DECODE_ERROR;
1454                 goto f_err;
1455                 }
1456
1457 #ifndef NO_RSA
1458         if (pkey->type == EVP_PKEY_RSA)
1459                 {
1460                 i=RSA_public_decrypt(i,p,p,pkey->pkey.rsa,RSA_PKCS1_PADDING);
1461                 if (i < 0)
1462                         {
1463                         al=SSL_AD_DECRYPT_ERROR;
1464                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1465                         goto f_err;
1466                         }
1467                 if ((i != (MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH)) ||
1468                         memcmp(&(s->s3->tmp.finish_md[0]),p,
1469                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH))
1470                         {
1471                         al=SSL_AD_DECRYPT_ERROR;
1472                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1473                         goto f_err;
1474                         }
1475                 }
1476         else
1477 #endif
1478 #ifndef NO_DSA
1479                 if (pkey->type == EVP_PKEY_DSA)
1480                 {
1481                 j=DSA_verify(pkey->save_type,
1482                         &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]),
1483                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1484                 if (j <= 0)
1485                         {
1486                         /* bad signature */
1487                         al=SSL_AD_DECRYPT_ERROR;
1488                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1489                         goto f_err;
1490                         }
1491                 }
1492         else
1493 #endif
1494                 {
1495                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1496                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1497                 goto f_err;
1498                 }
1499
1500
1501         ret=1;
1502         if (0)
1503                 {
1504 f_err:
1505                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1506                 }
1507 end:
1508         return(ret);
1509         }
1510
1511 static int ssl3_get_client_certificate(s)
1512 SSL *s;
1513         {
1514         int i,ok,al,ret= -1;
1515         X509 *x=NULL;
1516         unsigned long l,nc,llen,n;
1517         unsigned char *p,*d,*q;
1518         STACK *sk=NULL;
1519
1520         n=ssl3_get_message(s,
1521                 SSL3_ST_SR_CERT_A,
1522                 SSL3_ST_SR_CERT_B,
1523                 -1,
1524 #if defined(MSDOS) && !defined(WIN32)
1525                 1024*30, /* 30k max cert list :-) */
1526 #else
1527                 1024*100, /* 100k max cert list :-) */
1528 #endif
1529                 &ok);
1530
1531         if (!ok) return((int)n);
1532
1533         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1534                 {
1535                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1536                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1537                         {
1538                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1539                         al=SSL_AD_HANDSHAKE_FAILURE;
1540                         goto f_err;
1541                         }
1542                 /* If tls asked for a client cert we must return a 0 list */
1543                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1544                         {
1545                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1546                         al=SSL_AD_UNEXPECTED_MESSAGE;
1547                         goto f_err;
1548                         }
1549                 s->s3->tmp.reuse_message=1;
1550                 return(1);
1551                 }
1552
1553         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1554                 {
1555                 al=SSL_AD_UNEXPECTED_MESSAGE;
1556                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1557                 goto f_err;
1558                 }
1559         d=p=(unsigned char *)s->init_buf->data;
1560
1561         if ((sk=sk_new_null()) == NULL)
1562                 {
1563                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1564                 goto err;
1565                 }
1566
1567         n2l3(p,llen);
1568         if (llen+3 != n)
1569                 {
1570                 al=SSL_AD_DECODE_ERROR;
1571                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1572                 goto f_err;
1573                 }
1574         for (nc=0; nc<llen; )
1575                 {
1576                 n2l3(p,l);
1577                 if ((l+nc+3) > llen)
1578                         {
1579                         al=SSL_AD_DECODE_ERROR;
1580                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1581                         goto f_err;
1582                         }
1583
1584                 q=p;
1585                 x=d2i_X509(NULL,&p,l);
1586                 if (x == NULL)
1587                         {
1588                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1589                         goto err;
1590                         }
1591                 if (p != (q+l))
1592                         {
1593                         al=SSL_AD_DECODE_ERROR;
1594                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1595                         goto f_err;
1596                         }
1597                 if (!sk_push(sk,(char *)x))
1598                         {
1599                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1600                         goto err;
1601                         }
1602                 x=NULL;
1603                 nc+=l+3;
1604                 }
1605
1606         if (sk_num(sk) <= 0)
1607                 {
1608                 /* TLS does not mind 0 certs returned */
1609                 if (s->version == SSL3_VERSION)
1610                         {
1611                         al=SSL_AD_HANDSHAKE_FAILURE;
1612                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1613                         goto f_err;
1614                         }
1615                 /* Fail for TLS only if we required a certificate */
1616                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1617                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1618                         {
1619                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1620                         al=SSL_AD_HANDSHAKE_FAILURE;
1621                         goto f_err;
1622                         }
1623                 }
1624         else
1625                 {
1626                 i=ssl_verify_cert_chain(s,sk);
1627                 if (!i)
1628                         {
1629                         al=ssl_verify_alarm_type(s->verify_result);
1630                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1631                         goto f_err;
1632                         }
1633                 }
1634
1635         /* This should not be needed */
1636         if (s->session->peer != NULL)
1637                 X509_free(s->session->peer);
1638         s->session->peer=(X509 *)sk_shift(sk);
1639
1640         ret=1;
1641         if (0)
1642                 {
1643 f_err:
1644                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1645                 }
1646 err:
1647         if (x != NULL) X509_free(x);
1648         if (sk != NULL) sk_pop_free(sk,X509_free);
1649         return(ret);
1650         }
1651
1652 int ssl3_send_server_certificate(s)
1653 SSL *s;
1654         {
1655         unsigned long l;
1656         X509 *x;
1657
1658         if (s->state == SSL3_ST_SW_CERT_A)
1659                 {
1660                 x=ssl_get_server_send_cert(s);
1661                 if (x == NULL)
1662                         {
1663                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1664                         return(0);
1665                         }
1666
1667                 l=ssl3_output_cert_chain(s,x);
1668                 s->state=SSL3_ST_SW_CERT_B;
1669                 s->init_num=(int)l;
1670                 s->init_off=0;
1671                 }
1672
1673         /* SSL3_ST_SW_CERT_B */
1674         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1675         }