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 SSL_METHOD *ssl3_get_server_method(int ver);
  79 static int ssl3_get_client_hello(SSL *s);
  80 static int ssl3_send_server_hello(SSL *s);
  81 static int ssl3_send_server_key_exchange(SSL *s);
  82 static int ssl3_send_certificate_request(SSL *s);
  83 static int ssl3_send_server_done(SSL *s);
  84 static int ssl3_get_cert_verify(SSL *s);
  85 static int ssl3_get_client_key_exchange(SSL *s);
  86 static int ssl3_get_client_certificate(SSL *s);
  87 static int ssl3_send_hello_request(SSL *s);
  88
  89 #else
  90
  91 static SSL_METHOD *ssl3_get_server_method();
  92 static int ssl3_get_client_hello();
  93 static int ssl3_send_server_hello();
  94 static int ssl3_send_server_key_exchange();
  95 static int ssl3_send_certificate_request();
  96 static int ssl3_send_server_done();
  97 static int ssl3_get_cert_verify();
  98 static int ssl3_get_client_key_exchange();
  99 static int ssl3_get_client_certificate();
 100 static int ssl3_send_hello_request();
 101
 102 #endif
 103
 104 static SSL_METHOD *ssl3_get_server_method(ver)
 105 int ver;
 106         {
 107         if (ver == SSL3_VERSION)
 108                 return(SSLv3_server_method());
 109         else
 110                 return(NULL);
 111         }
 112
 113 SSL_METHOD *SSLv3_server_method()
 114         {
 115         static int init=1;
 116         static SSL_METHOD SSLv3_server_data;
 117
 118         if (init)
 119                 {
 120                 init=0;
 121                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 122                         sizeof(SSL_METHOD));
 123                 SSLv3_server_data.ssl_accept=ssl3_accept;
 124                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 125                 }
 126         return(&SSLv3_server_data);
 127         }
 128
 129 int ssl3_accept(s)
 130 SSL *s;
 131         {
 132         BUF_MEM *buf;
 133         unsigned long l,Time=time(NULL);
 134         void (*cb)()=NULL;
 135         long num1;
 136         int ret= -1;
 137         CERT *ct;
 138         int new_state,state,skip=0;
 139
 140         RAND_seed(&Time,sizeof(Time));
 141         ERR_clear_error();
 142         clear_sys_error();
 143
 144         if (s->info_callback != NULL)
 145                 cb=s->info_callback;
 146         else if (s->ctx->info_callback != NULL)
 147                 cb=s->ctx->info_callback;
 148
 149         /* init things to blank */
 150         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 151         s->in_handshake++;
 152
 153 #ifdef undef
 154         /* FIX THIS EAY EAY EAY */
 155         /* we don't actually need a cert, we just need a cert or a DH_tmp */
 156         if (((s->session == NULL) || (s->session->cert == NULL)) &&
 157                 (s->cert == NULL))
 158                 {
 159                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 160                 ret= -1;
 161                 goto end;
 162                 }
 163 #endif
 164
 165         for (;;)
 166                 {
 167                 state=s->state;
 168
 169                 switch (s->state)
 170                         {
 171                 case SSL_ST_RENEGOTIATE:
 172                         s->new_session=1;
 173                         /* s->state=SSL_ST_ACCEPT; */
 174
 175                 case SSL_ST_BEFORE:
 176                 case SSL_ST_ACCEPT:
 177                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 178                 case SSL_ST_OK|SSL_ST_ACCEPT:
 179
 180                         s->server=1;
 181                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 182
 183                         if ((s->version>>8) != 3)
 184                                 abort();
 185                         /* s->version=SSL3_VERSION; */
 186                         s->type=SSL_ST_ACCEPT;
 187
 188                         if (s->init_buf == NULL)
 189                                 {
 190                                 if ((buf=BUF_MEM_new()) == NULL)
 191                                         {
 192                                         ret= -1;
 193                                         goto end;
 194                                         }
 195                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 196                                         {
 197                                         ret= -1;
 198                                         goto end;
 199                                         }
 200                                 s->init_buf=buf;
 201                                 }
 202
 203                         if (!ssl3_setup_buffers(s))
 204                                 {
 205                                 ret= -1;
 206                                 goto end;
 207                                 }
 208
 209                         /* Ok, we now need to push on a buffering BIO so that
 210                          * the output is sent in a way that TCP likes :-)
 211                          */
 212                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 213
 214                         s->init_num=0;
 215
 216                         if (s->state != SSL_ST_RENEGOTIATE)
 217                                 {
 218                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 219                                 ssl3_init_finished_mac(s);
 220                                 s->ctx->stats.sess_accept++;
 221                                 }
 222                         else
 223                                 {
 224                                 s->ctx->stats.sess_accept_renegotiate++;
 225                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 226                                 }
 227                         break;
 228
 229                 case SSL3_ST_SW_HELLO_REQ_A:
 230                 case SSL3_ST_SW_HELLO_REQ_B:
 231
 232                         s->shutdown=0;
 233                         ret=ssl3_send_hello_request(s);
 234                         if (ret <= 0) goto end;
 235                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 236                         s->state=SSL3_ST_SW_FLUSH;
 237                         s->init_num=0;
 238
 239                         ssl3_init_finished_mac(s);
 240                         break;
 241
 242                 case SSL3_ST_SW_HELLO_REQ_C:
 243                         s->state=SSL_ST_OK;
 244                         ret=1;
 245                         goto end;
 246                         /* break; */
 247
 248                 case SSL3_ST_SR_CLNT_HELLO_A:
 249                 case SSL3_ST_SR_CLNT_HELLO_B:
 250                 case SSL3_ST_SR_CLNT_HELLO_C:
 251
 252                         s->shutdown=0;
 253                         ret=ssl3_get_client_hello(s);
 254                         if (ret <= 0) goto end;
 255                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 256                         s->init_num=0;
 257                         break;
 258
 259                 case SSL3_ST_SW_SRVR_HELLO_A:
 260                 case SSL3_ST_SW_SRVR_HELLO_B:
 261                         ret=ssl3_send_server_hello(s);
 262                         if (ret <= 0) goto end;
 263
 264                         if (s->hit)
 265                                 s->state=SSL3_ST_SW_CHANGE_A;
 266                         else
 267                                 s->state=SSL3_ST_SW_CERT_A;
 268                         s->init_num=0;
 269                         break;
 270
 271                 case SSL3_ST_SW_CERT_A:
 272                 case SSL3_ST_SW_CERT_B:
 273                         /* Check if it is anon DH */
 274                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 275                                 {
 276                                 ret=ssl3_send_server_certificate(s);
 277                                 if (ret <= 0) goto end;
 278                                 }
 279                         else
 280                                 skip=1;
 281                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 282                         s->init_num=0;
 283                         break;
 284
 285                 case SSL3_ST_SW_KEY_EXCH_A:
 286                 case SSL3_ST_SW_KEY_EXCH_B:
 287                         l=s->s3->tmp.new_cipher->algorithms;
 288                         if (s->session->cert == NULL)
 289                                 {
 290                                 if (s->cert != NULL)
 291                                         {
 292                                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 293                                         s->session->cert=s->cert;
 294                                         }
 295                                 else
 296                                         {
 297                                         CRYPTO_add(&s->ctx->default_cert->references,1,CRYPTO_LOCK_SSL_CERT);
 298                                         s->session->cert=s->ctx->default_cert;
 299                                         }
 300                                 }
 301                         ct=s->session->cert;
 302
 303                         /* clear this, it may get reset by
 304                          * send_server_key_exchange */
 305                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 306                                 s->s3->tmp.use_rsa_tmp=1;
 307                         else
 308                                 s->s3->tmp.use_rsa_tmp=0;
 309
 310                         /* only send if a DH key exchange, fortezza or
 311                          * RSA but we have a sign only certificate */
 312                         if (s->s3->tmp.use_rsa_tmp
 313                             || (l & (SSL_DH|SSL_kFZA))
 314                             || ((l & SSL_kRSA)
 315                                 && (ct->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 316                                     || (SSL_IS_EXPORT(l)
 317                                         && EVP_PKEY_size(ct->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_EXPORT_PKEYLENGTH(l)
 318                                         )
 319                                     )
 320                                 )
 321                             )
 322                                 {
 323                                 ret=ssl3_send_server_key_exchange(s);
 324                                 if (ret <= 0) goto end;
 325                                 }
 326                         else
 327                                 skip=1;
 328
 329                         s->state=SSL3_ST_SW_CERT_REQ_A;
 330                         s->init_num=0;
 331                         break;
 332
 333                 case SSL3_ST_SW_CERT_REQ_A:
 334                 case SSL3_ST_SW_CERT_REQ_B:
 335                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 336                                 ((s->session->peer != NULL) &&
 337                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 338                                 {
 339                                 /* no cert request */
 340                                 skip=1;
 341                                 s->s3->tmp.cert_request=0;
 342                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 343                                 }
 344                         else
 345                                 {
 346                                 s->s3->tmp.cert_request=1;
 347                                 ret=ssl3_send_certificate_request(s);
 348                                 if (ret <= 0) goto end;
 349                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 350                                 s->init_num=0;
 351                                 }
 352                         break;
 353
 354                 case SSL3_ST_SW_SRVR_DONE_A:
 355                 case SSL3_ST_SW_SRVR_DONE_B:
 356                         ret=ssl3_send_server_done(s);
 357                         if (ret <= 0) goto end;
 358                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 359                         s->state=SSL3_ST_SW_FLUSH;
 360                         s->init_num=0;
 361                         break;
 362
 363                 case SSL3_ST_SW_FLUSH:
 364                         /* number of bytes to be flushed */
 365                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 366                         if (num1 > 0)
 367                                 {
 368                                 s->rwstate=SSL_WRITING;
 369                                 num1=BIO_flush(s->wbio);
 370                                 if (num1 <= 0) { ret= -1; goto end; }
 371                                 s->rwstate=SSL_NOTHING;
 372                                 }
 373
 374                         s->state=s->s3->tmp.next_state;
 375                         break;
 376
 377                 case SSL3_ST_SR_CERT_A:
 378                 case SSL3_ST_SR_CERT_B:
 379                         /* could be sent for a DH cert, even if we
 380                          * have not asked for it :-) */
 381                         ret=ssl3_get_client_certificate(s);
 382                         if (ret <= 0) goto end;
 383                         s->init_num=0;
 384                         s->state=SSL3_ST_SR_KEY_EXCH_A;
 385                         break;
 386
 387                 case SSL3_ST_SR_KEY_EXCH_A:
 388                 case SSL3_ST_SR_KEY_EXCH_B:
 389                         ret=ssl3_get_client_key_exchange(s);
 390                         if (ret <= 0) goto end;
 391                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 392                         s->init_num=0;
 393
 394                         /* We need to get hashes here so if there is
 395                          * a client cert, it can be verified */
 396                         s->method->ssl3_enc->cert_verify_mac(s,
 397                                 &(s->s3->finish_dgst1),
 398                                 &(s->s3->tmp.finish_md[0]));
 399                         s->method->ssl3_enc->cert_verify_mac(s,
 400                                 &(s->s3->finish_dgst2),
 401                                 &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]));
 402
 403                         break;
 404
 405                 case SSL3_ST_SR_CERT_VRFY_A:
 406                 case SSL3_ST_SR_CERT_VRFY_B:
 407
 408                         /* we should decide if we expected this one */
 409                         ret=ssl3_get_cert_verify(s);
 410                         if (ret <= 0) goto end;
 411
 412                         s->state=SSL3_ST_SR_FINISHED_A;
 413                         s->init_num=0;
 414                         break;
 415
 416                 case SSL3_ST_SR_FINISHED_A:
 417                 case SSL3_ST_SR_FINISHED_B:
 418                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 419                                 SSL3_ST_SR_FINISHED_B);
 420                         if (ret <= 0) goto end;
 421                         if (s->hit)
 422                                 s->state=SSL_ST_OK;
 423                         else
 424                                 s->state=SSL3_ST_SW_CHANGE_A;
 425                         s->init_num=0;
 426                         break;
 427
 428                 case SSL3_ST_SW_CHANGE_A:
 429                 case SSL3_ST_SW_CHANGE_B:
 430
 431                         s->session->cipher=s->s3->tmp.new_cipher;
 432                         if (!s->method->ssl3_enc->setup_key_block(s))
 433                                 { ret= -1; goto end; }
 434
 435                         ret=ssl3_send_change_cipher_spec(s,
 436                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 437
 438                         if (ret <= 0) goto end;
 439                         s->state=SSL3_ST_SW_FINISHED_A;
 440                         s->init_num=0;
 441
 442                         if (!s->method->ssl3_enc->change_cipher_state(s,
 443                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 444                                 {
 445                                 ret= -1;
 446                                 goto end;
 447                                 }
 448
 449                         break;
 450
 451                 case SSL3_ST_SW_FINISHED_A:
 452                 case SSL3_ST_SW_FINISHED_B:
 453                         ret=ssl3_send_finished(s,
 454                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 455                                 s->method->ssl3_enc->server_finished,
 456                                 s->method->ssl3_enc->server_finished_len);
 457                         if (ret <= 0) goto end;
 458                         s->state=SSL3_ST_SW_FLUSH;
 459                         if (s->hit)
 460                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 461                         else
 462                                 s->s3->tmp.next_state=SSL_ST_OK;
 463                         s->init_num=0;
 464                         break;
 465
 466                 case SSL_ST_OK:
 467                         /* clean a few things up */
 468                         ssl3_cleanup_key_block(s);
 469
 470                         BUF_MEM_free(s->init_buf);
 471                         s->init_buf=NULL;
 472
 473                         /* remove buffering on output */
 474                         ssl_free_wbio_buffer(s);
 475
 476                         s->new_session=0;
 477                         s->init_num=0;
 478
 479                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 480
 481                         s->ctx->stats.sess_accept_good++;
 482                         /* s->server=1; */
 483                         s->handshake_func=ssl3_accept;
 484                         ret=1;
 485
 486                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 487
 488                         goto end;
 489                         /* break; */
 490
 491                 default:
 492                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 493                         ret= -1;
 494                         goto end;
 495                         /* break; */
 496                         }
 497
 498                 if (!s->s3->tmp.reuse_message && !skip)
 499                         {
 500                         if (s->debug)
 501                                 {
 502                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 503                                         goto end;
 504                                 }
 505
 506
 507                         if ((cb != NULL) && (s->state != state))
 508                                 {
 509                                 new_state=s->state;
 510                                 s->state=state;
 511                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 512                                 s->state=new_state;
 513                                 }
 514                         }
 515                 skip=0;
 516                 }
 517 end:
 518         /* BIO_flush(s->wbio); */
 519
 520         if (cb != NULL)
 521                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 522         s->in_handshake--;
 523         return(ret);
 524         }
 525
 526 static int ssl3_send_hello_request(s)
 527 SSL *s;
 528         {
 529         unsigned char *p;
 530
 531         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 532                 {
 533                 p=(unsigned char *)s->init_buf->data;
 534                 *(p++)=SSL3_MT_CLIENT_REQUEST;
 535                 *(p++)=0;
 536                 *(p++)=0;
 537                 *(p++)=0;
 538
 539                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 540                 /* number of bytes to write */
 541                 s->init_num=4;
 542                 s->init_off=0;
 543                 }
 544
 545         /* SSL3_ST_SW_HELLO_REQ_B */
 546         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 547         }
 548
 549 static int ssl3_get_client_hello(s)
 550 SSL *s;
 551         {
 552         int i,j,ok,al,ret= -1;
 553         long n;
 554         unsigned long id;
 555         unsigned char *p,*d,*q;
 556         SSL_CIPHER *c;
 557         SSL_COMP *comp=NULL;
 558         STACK *ciphers=NULL;
 559
 560         /* We do this so that we will respond with our native type.
 561          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 562          * This down switching should be handled by a different method.
 563          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 564          * TLSv1.
 565          */
 566         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 567                 {
 568                 s->first_packet=1;
 569                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 570                 }
 571         n=ssl3_get_message(s,
 572                 SSL3_ST_SR_CLNT_HELLO_B,
 573                 SSL3_ST_SR_CLNT_HELLO_C,
 574                 SSL3_MT_CLIENT_HELLO,
 575                 SSL3_RT_MAX_PLAIN_LENGTH,
 576                 &ok);
 577
 578         if (!ok) return((int)n);
 579         d=p=(unsigned char *)s->init_buf->data;
 580
 581         /* The version number has already been checked in ssl3_get_message.
 582          * I a native TLSv1/SSLv3 method, the match must be correct except
 583          * perhaps for the first message */
 584 /*      s->client_version=(((int)p[0])<<8)|(int)p[1]; */
 585         p+=2;
 586
 587         /* load the client random */
 588         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 589         p+=SSL3_RANDOM_SIZE;
 590
 591         /* get the session-id */
 592         j= *(p++);
 593
 594         s->hit=0;
 595         if (j == 0)
 596                 {
 597                 if (!ssl_get_new_session(s,1))
 598                         goto err;
 599                 }
 600         else
 601                 {
 602                 i=ssl_get_prev_session(s,p,j);
 603                 if (i == 1)
 604                         { /* previous session */
 605                         s->hit=1;
 606                         }
 607                 else
 608                         {
 609                         if (!ssl_get_new_session(s,1))
 610                                 goto err;
 611                         }
 612                 }
 613
 614         p+=j;
 615         n2s(p,i);
 616         if ((i == 0) && (j != 0))
 617                 {
 618                 /* we need a cipher if we are not resuming a session */
 619                 al=SSL_AD_ILLEGAL_PARAMETER;
 620                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 621                 goto f_err;
 622                 }
 623         if ((i+p) > (d+n))
 624                 {
 625                 /* not enough data */
 626                 al=SSL_AD_DECODE_ERROR;
 627                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 628                 goto f_err;
 629                 }
 630         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 631                 == NULL))
 632                 {
 633                 goto err;
 634                 }
 635         p+=i;
 636
 637         /* If it is a hit, check that the cipher is in the list */
 638         if ((s->hit) && (i > 0))
 639                 {
 640                 j=0;
 641                 id=s->session->cipher->id;
 642
 643 #ifdef CIPHER_DEBUG
 644                 printf("client sent %d ciphers\n",sk_num(ciphers));
 645 #endif
 646                 for (i=0; i<sk_num(ciphers); i++)
 647                         {
 648                         c=(SSL_CIPHER *)sk_value(ciphers,i);
 649 #ifdef CIPHER_DEBUG
 650                         printf("client [%2d of %2d]:%s\n",
 651                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 652 #endif
 653                         if (c->id == id)
 654                                 {
 655                                 j=1;
 656                                 break;
 657                                 }
 658                         }
 659                 if (j == 0)
 660                         {
 661                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_num(ciphers) == 1))
 662                                 {
 663                                 /* Very bad for multi-threading.... */
 664                                 s->session->cipher=
 665                                         (SSL_CIPHER *)sk_value(ciphers,0);
 666                                 }
 667                         else
 668                                 {
 669                                 /* we need to have the cipher in the cipher
 670                                  * list if we are asked to reuse it */
 671                                 al=SSL_AD_ILLEGAL_PARAMETER;
 672                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 673                                 goto f_err;
 674                                 }
 675                         }
 676                 }
 677
 678         /* compression */
 679         i= *(p++);
 680         q=p;
 681         for (j=0; j<i; j++)
 682                 {
 683                 if (p[j] == 0) break;
 684                 }
 685
 686         p+=i;
 687         if (j >= i)
 688                 {
 689                 /* no compress */
 690                 al=SSL_AD_DECODE_ERROR;
 691                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 692                 goto f_err;
 693                 }
 694
 695         /* Worst case, we will use the NULL compression, but if we have other
 696          * options, we will now look for them.  We have i-1 compression
 697          * algorithms from the client, starting at q. */
 698         s->s3->tmp.new_compression=NULL;
 699         if (s->ctx->comp_methods != NULL)
 700                 { /* See if we have a match */
 701                 int m,nn,o,v,done=0;
 702
 703                 nn=sk_num(s->ctx->comp_methods);
 704                 for (m=0; m<nn; m++)
 705                         {
 706                         comp=(SSL_COMP *)sk_value(s->ctx->comp_methods,m);
 707                         v=comp->id;
 708                         for (o=0; o<i; o++)
 709                                 {
 710                                 if (v == q[o])
 711                                         {
 712                                         done=1;
 713                                         break;
 714                                         }
 715                                 }
 716                         if (done) break;
 717                         }
 718                 if (done)
 719                         s->s3->tmp.new_compression=comp;
 720                 else
 721                         comp=NULL;
 722                 }
 723
 724         /* TLS does not mind if there is extra stuff */
 725         if (s->version == SSL3_VERSION)
 726                 {
 727                 if (p > (d+n))
 728                         {
 729                         /* wrong number of bytes,
 730                          * there could be more to follow */
 731                         al=SSL_AD_DECODE_ERROR;
 732                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 733                         goto f_err;
 734                         }
 735                 }
 736
 737         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 738          * pick a cipher */
 739
 740         if (!s->hit)
 741                 {
 742                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 743                 if (s->session->ciphers != NULL)
 744                         sk_free(s->session->ciphers);
 745                 s->session->ciphers=ciphers;
 746                 if (ciphers == NULL)
 747                         {
 748                         al=SSL_AD_ILLEGAL_PARAMETER;
 749                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 750                         goto f_err;
 751                         }
 752                 ciphers=NULL;
 753                 c=ssl3_choose_cipher(s,s->session->ciphers,
 754                         ssl_get_ciphers_by_id(s));
 755
 756                 if (c == NULL)
 757                         {
 758                         al=SSL_AD_HANDSHAKE_FAILURE;
 759                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 760                         goto f_err;
 761                         }
 762                 s->s3->tmp.new_cipher=c;
 763                 }
 764         else
 765                 {
 766                 /* Session-id reuse */
 767 #ifdef REUSE_CIPHER_BUG
 768                 STACK *sk;
 769                 SSL_CIPHER *nc=NULL;
 770                 SSL_CIPHER *ec=NULL;
 771
 772                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 773                         {
 774                         sk=s->session->ciphers;
 775                         for (i=0; i<sk_num(sk); i++)
 776                                 {
 777                                 c=(SSL_CIPHER *)sk_value(sk,i);
 778                                 if (c->algorithms & SSL_eNULL)
 779                                         nc=c;
 780                                 if (SSL_C_IS_EXPORT(c))
 781                                         ec=c;
 782                                 }
 783                         if (nc != NULL)
 784                                 s->s3->tmp.new_cipher=nc;
 785                         else if (ec != NULL)
 786                                 s->s3->tmp.new_cipher=ec;
 787                         else
 788                                 s->s3->tmp.new_cipher=s->session->cipher;
 789                         }
 790                 else
 791 #endif
 792                 s->s3->tmp.new_cipher=s->session->cipher;
 793                 }
 794
 795         /* we now have the following setup.
 796          * client_random
 797          * cipher_list          - our prefered list of ciphers
 798          * ciphers              - the clients prefered list of ciphers
 799          * compression          - basically ignored right now
 800          * ssl version is set   - sslv3
 801          * s->session           - The ssl session has been setup.
 802          * s->hit               - sesson reuse flag
 803          * s->tmp.new_cipher    - the new cipher to use.
 804          */
 805
 806         ret=1;
 807         if (0)
 808                 {
 809 f_err:
 810                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 811                 }
 812 err:
 813         if (ciphers != NULL) sk_free(ciphers);
 814         return(ret);
 815         }
 816
 817 static int ssl3_send_server_hello(s)
 818 SSL *s;
 819         {
 820         unsigned char *buf;
 821         unsigned char *p,*d;
 822         int i,sl;
 823         unsigned long l,Time;
 824
 825         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 826                 {
 827                 buf=(unsigned char *)s->init_buf->data;
 828                 p=s->s3->server_random;
 829                 Time=time(NULL);                        /* Time */
 830                 l2n(Time,p);
 831                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 832                 /* Do the message type and length last */
 833                 d=p= &(buf[4]);
 834
 835                 *(p++)=s->version>>8;
 836                 *(p++)=s->version&0xff;
 837
 838                 /* Random stuff */
 839                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 840                 p+=SSL3_RANDOM_SIZE;
 841
 842                 /* now in theory we have 3 options to sending back the
 843                  * session id.  If it is a re-use, we send back the
 844                  * old session-id, if it is a new session, we send
 845                  * back the new session-id or we send back a 0 length
 846                  * session-id if we want it to be single use.
 847                  * Currently I will not implement the '0' length session-id
 848                  * 12-Jan-98 - I'll now support the '0' length stuff.
 849                  */
 850                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 851                         s->session->session_id_length=0;
 852
 853                 sl=s->session->session_id_length;
 854                 *(p++)=sl;
 855                 memcpy(p,s->session->session_id,sl);
 856                 p+=sl;
 857
 858                 /* put the cipher */
 859                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 860                 p+=i;
 861
 862                 /* put the compression method */
 863                 if (s->s3->tmp.new_compression == NULL)
 864                         *(p++)=0;
 865                 else
 866                         *(p++)=s->s3->tmp.new_compression->id;
 867
 868                 /* do the header */
 869                 l=(p-d);
 870                 d=buf;
 871                 *(d++)=SSL3_MT_SERVER_HELLO;
 872                 l2n3(l,d);
 873
 874                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 875                 /* number of bytes to write */
 876                 s->init_num=p-buf;
 877                 s->init_off=0;
 878                 }
 879
 880         /* SSL3_ST_CW_CLNT_HELLO_B */
 881         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 882         }
 883
 884 static int ssl3_send_server_done(s)
 885 SSL *s;
 886         {
 887         unsigned char *p;
 888
 889         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 890                 {
 891                 p=(unsigned char *)s->init_buf->data;
 892
 893                 /* do the header */
 894                 *(p++)=SSL3_MT_SERVER_DONE;
 895                 *(p++)=0;
 896                 *(p++)=0;
 897                 *(p++)=0;
 898
 899                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 900                 /* number of bytes to write */
 901                 s->init_num=4;
 902                 s->init_off=0;
 903                 }
 904
 905         /* SSL3_ST_CW_CLNT_HELLO_B */
 906         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 907         }
 908
 909 static int ssl3_send_server_key_exchange(s)
 910 SSL *s;
 911         {
 912 #ifndef NO_RSA
 913         unsigned char *q;
 914         int j,num;
 915         RSA *rsa;
 916         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 917 #endif
 918 #ifndef NO_DH
 919         DH *dh,*dhp;
 920 #endif
 921         EVP_PKEY *pkey;
 922         unsigned char *p,*d;
 923         int al,i;
 924         unsigned long type;
 925         int n;
 926         CERT *cert;
 927         BIGNUM *r[4];
 928         int nr[4],kn;
 929         BUF_MEM *buf;
 930         EVP_MD_CTX md_ctx;
 931
 932         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 933                 {
 934                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 935                 cert=s->session->cert;
 936
 937                 buf=s->init_buf;
 938
 939                 r[0]=r[1]=r[2]=r[3]=NULL;
 940                 n=0;
 941 #ifndef NO_RSA
 942                 if (type & SSL_kRSA)
 943                         {
 944                         rsa=cert->rsa_tmp;
 945                         if ((rsa == NULL) && (s->ctx->default_cert->rsa_tmp_cb != NULL))
 946                                 {
 947                                 rsa=s->ctx->default_cert->rsa_tmp_cb(s,
 948                                         !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher));
 949                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 950                                 cert->rsa_tmp=rsa;
 951                                 }
 952                         if (rsa == NULL)
 953                                 {
 954                                 al=SSL_AD_HANDSHAKE_FAILURE;
 955                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 956                                 goto f_err;
 957                                 }
 958                         r[0]=rsa->n;
 959                         r[1]=rsa->e;
 960                         s->s3->tmp.use_rsa_tmp=1;
 961                         }
 962                 else
 963 #endif
 964 #ifndef NO_DH
 965                         if (type & SSL_kEDH)
 966                         {
 967                         dhp=cert->dh_tmp;
 968                         if ((dhp == NULL) && (cert->dh_tmp_cb != NULL))
 969                                 dhp=cert->dh_tmp_cb(s,
 970                                         !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher));
 971                         if (dhp == NULL)
 972                                 {
 973                                 al=SSL_AD_HANDSHAKE_FAILURE;
 974                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 975                                 goto f_err;
 976                                 }
 977                         if ((dh=DHparams_dup(dhp)) == NULL)
 978                                 {
 979                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 980                                 goto err;
 981                                 }
 982
 983                         s->s3->tmp.dh=dh;
 984                         if ((dhp->pub_key == NULL ||
 985                              dhp->priv_key == NULL ||
 986                              (s->options & SSL_OP_SINGLE_DH_USE)))
 987                                 {
 988                                 if(!DH_generate_key(dh))
 989                                     {
 990                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
 991                                            ERR_R_DH_LIB);
 992                                     goto err;
 993                                     }
 994                                 }
 995                         else
 996                                 {
 997                                 dh->pub_key=BN_dup(dhp->pub_key);
 998                                 dh->priv_key=BN_dup(dhp->priv_key);
 999                                 if ((dh->pub_key == NULL) ||
1000                                         (dh->priv_key == NULL))
1001                                         {
1002                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1003                                         goto err;
1004                                         }
1005                                 }
1006                         r[0]=dh->p;
1007                         r[1]=dh->g;
1008                         r[2]=dh->pub_key;
1009                         }
1010                 else
1011 #endif
1012                         {
1013                         al=SSL_AD_HANDSHAKE_FAILURE;
1014                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1015                         goto f_err;
1016                         }
1017                 for (i=0; r[i] != NULL; i++)
1018                         {
1019                         nr[i]=BN_num_bytes(r[i]);
1020                         n+=2+nr[i];
1021                         }
1022
1023                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1024                         {
1025                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1026                                 == NULL)
1027                                 {
1028                                 al=SSL_AD_DECODE_ERROR;
1029                                 goto f_err;
1030                                 }
1031                         kn=EVP_PKEY_size(pkey);
1032                         }
1033                 else
1034                         {
1035                         pkey=NULL;
1036                         kn=0;
1037                         }
1038
1039                 if (!BUF_MEM_grow(buf,n+4+kn))
1040                         {
1041                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1042                         goto err;
1043                         }
1044                 d=(unsigned char *)s->init_buf->data;
1045                 p= &(d[4]);
1046
1047                 for (i=0; r[i] != NULL; i++)
1048                         {
1049                         s2n(nr[i],p);
1050                         BN_bn2bin(r[i],p);
1051                         p+=nr[i];
1052                         }
1053
1054                 /* not anonymous */
1055                 if (pkey != NULL)
1056                         {
1057                         /* n is the length of the params, they start at &(d[4])
1058                          * and p points to the space at the end. */
1059 #ifndef NO_RSA
1060                         if (pkey->type == EVP_PKEY_RSA)
1061                                 {
1062                                 q=md_buf;
1063                                 j=0;
1064                                 for (num=2; num > 0; num--)
1065                                         {
1066                                         EVP_DigestInit(&md_ctx,(num == 2)
1067                                                 ?s->ctx->md5:s->ctx->sha1);
1068                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1069                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1070                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1071                                         EVP_DigestFinal(&md_ctx,q,
1072                                                 (unsigned int *)&i);
1073                                         q+=i;
1074                                         j+=i;
1075                                         }
1076                                 i=RSA_private_encrypt(j,md_buf,&(p[2]),
1077                                         pkey->pkey.rsa,RSA_PKCS1_PADDING);
1078                                 if (i <= 0)
1079                                         {
1080                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1081                                         goto err;
1082                                         }
1083                                 s2n(i,p);
1084                                 n+=i+2;
1085                                 }
1086                         else
1087 #endif
1088 #if !defined(NO_DSA)
1089                                 if (pkey->type == EVP_PKEY_DSA)
1090                                 {
1091                                 /* lets do DSS */
1092                                 EVP_SignInit(&md_ctx,EVP_dss1());
1093                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1094                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1095                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1096                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1097                                         (unsigned int *)&i,pkey))
1098                                         {
1099                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1100                                         goto err;
1101                                         }
1102                                 s2n(i,p);
1103                                 n+=i+2;
1104                                 }
1105                         else
1106 #endif
1107                                 {
1108                                 /* Is this error check actually needed? */
1109                                 al=SSL_AD_HANDSHAKE_FAILURE;
1110                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1111                                 goto f_err;
1112                                 }
1113                         }
1114
1115                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1116                 l2n3(n,d);
1117
1118                 /* we should now have things packed up, so lets send
1119                  * it off */
1120                 s->init_num=n+4;
1121                 s->init_off=0;
1122                 }
1123
1124         /* SSL3_ST_SW_KEY_EXCH_B */
1125         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1126 f_err:
1127         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1128 err:
1129         return(-1);
1130         }
1131
1132 static int ssl3_send_certificate_request(s)
1133 SSL *s;
1134         {
1135         unsigned char *p,*d;
1136         int i,j,nl,off,n;
1137         STACK *sk=NULL;
1138         X509_NAME *name;
1139         BUF_MEM *buf;
1140
1141         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1142                 {
1143                 buf=s->init_buf;
1144
1145                 d=p=(unsigned char *)&(buf->data[4]);
1146
1147                 /* get the list of acceptable cert types */
1148                 p++;
1149                 n=ssl3_get_req_cert_type(s,p);
1150                 d[0]=n;
1151                 p+=n;
1152                 n++;
1153
1154                 off=n;
1155                 p+=2;
1156                 n+=2;
1157
1158                 sk=SSL_get_client_CA_list(s);
1159                 nl=0;
1160                 if (sk != NULL)
1161                         {
1162                         for (i=0; i<sk_num(sk); i++)
1163                                 {
1164                                 name=(X509_NAME *)sk_value(sk,i);
1165                                 j=i2d_X509_NAME(name,NULL);
1166                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1167                                         {
1168                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1169                                         goto err;
1170                                         }
1171                                 p=(unsigned char *)&(buf->data[4+n]);
1172                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1173                                         {
1174                                         s2n(j,p);
1175                                         i2d_X509_NAME(name,&p);
1176                                         n+=2+j;
1177                                         nl+=2+j;
1178                                         }
1179                                 else
1180                                         {
1181                                         d=p;
1182                                         i2d_X509_NAME(name,&p);
1183                                         j-=2; s2n(j,d); j+=2;
1184                                         n+=j;
1185                                         nl+=j;
1186                                         }
1187                                 }
1188                         }
1189                 /* else no CA names */
1190                 p=(unsigned char *)&(buf->data[4+off]);
1191                 s2n(nl,p);
1192
1193                 d=(unsigned char *)buf->data;
1194                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1195                 l2n3(n,d);
1196
1197                 /* we should now have things packed up, so lets send
1198                  * it off */
1199
1200                 s->init_num=n+4;
1201                 s->init_off=0;
1202                 }
1203
1204         /* SSL3_ST_SW_CERT_REQ_B */
1205         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1206 err:
1207         return(-1);
1208         }
1209
1210 static int ssl3_get_client_key_exchange(s)
1211 SSL *s;
1212         {
1213         int i,al,ok;
1214         long n;
1215         unsigned long l;
1216         unsigned char *p;
1217         RSA *rsa=NULL;
1218         EVP_PKEY *pkey=NULL;
1219 #ifndef NO_DH
1220         BIGNUM *pub=NULL;
1221         DH *dh_srvr;
1222 #endif
1223
1224         n=ssl3_get_message(s,
1225                 SSL3_ST_SR_KEY_EXCH_A,
1226                 SSL3_ST_SR_KEY_EXCH_B,
1227                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1228                 400, /* ???? */
1229                 &ok);
1230
1231         if (!ok) return((int)n);
1232         p=(unsigned char *)s->init_buf->data;
1233
1234         l=s->s3->tmp.new_cipher->algorithms;
1235
1236 #ifndef NO_RSA
1237         if (l & SSL_kRSA)
1238                 {
1239                 /* FIX THIS UP EAY EAY EAY EAY */
1240                 if (s->s3->tmp.use_rsa_tmp)
1241                         {
1242                         if ((s->session->cert != NULL) &&
1243                                 (s->session->cert->rsa_tmp != NULL))
1244                                 rsa=s->session->cert->rsa_tmp;
1245                         else if ((s->ctx->default_cert != NULL) &&
1246                                 (s->ctx->default_cert->rsa_tmp != NULL))
1247                                 rsa=s->ctx->default_cert->rsa_tmp;
1248                         /* Don't do a callback because rsa_tmp should
1249                          * be sent already */
1250                         if (rsa == NULL)
1251                                 {
1252                                 al=SSL_AD_HANDSHAKE_FAILURE;
1253                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1254                                 goto f_err;
1255
1256                                 }
1257                         }
1258                 else
1259                         {
1260                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1261                         if (    (pkey == NULL) ||
1262                                 (pkey->type != EVP_PKEY_RSA) ||
1263                                 (pkey->pkey.rsa == NULL))
1264                                 {
1265                                 al=SSL_AD_HANDSHAKE_FAILURE;
1266                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1267                                 goto f_err;
1268                                 }
1269                         rsa=pkey->pkey.rsa;
1270                         }
1271
1272                 /* TLS */
1273                 if (s->version > SSL3_VERSION)
1274                         {
1275                         n2s(p,i);
1276                         if (n != i+2)
1277                                 {
1278                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1279                                         {
1280                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1281                                         goto err;
1282                                         }
1283                                 else
1284                                         p-=2;
1285                                 }
1286                         else
1287                                 n=i;
1288                         }
1289
1290                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1291
1292 #if 1
1293                 /* If a bad decrypt, use a random master key */
1294                 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1295                         ((p[0] != (s->client_version>>8)) ||
1296                          (p[1] != (s->client_version & 0xff))))
1297                         {
1298                         int bad=1;
1299
1300                         if ((i == SSL_MAX_MASTER_KEY_LENGTH) &&
1301                                 (p[0] == (s->version>>8)) &&
1302                                 (p[1] == 0))
1303                                 {
1304                                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
1305                                         bad=0;
1306                                 }
1307                         if (bad)
1308                                 {
1309                                 p[0]=(s->version>>8);
1310                                 p[1]=(s->version & 0xff);
1311                                 RAND_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1312                                 i=SSL_MAX_MASTER_KEY_LENGTH;
1313                                 }
1314                         /* else, an SSLeay bug, ssl only server, tls client */
1315                         }
1316 #else
1317                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1318                         {
1319                         al=SSL_AD_DECODE_ERROR;
1320                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1321                         goto f_err;
1322                         }
1323
1324                 if ((p[0] != (s->version>>8)) || (p[1] != (s->version & 0xff)))
1325                         {
1326                         al=SSL_AD_DECODE_ERROR;
1327                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1328                         goto f_err;
1329                         }
1330 #endif
1331
1332                 s->session->master_key_length=
1333                         s->method->ssl3_enc->generate_master_secret(s,
1334                                 s->session->master_key,
1335                                 p,i);
1336                 memset(p,0,i);
1337                 }
1338         else
1339 #endif
1340 #ifndef NO_DH
1341                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1342                 {
1343                 n2s(p,i);
1344                 if (n != i+2)
1345                         {
1346                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1347                                 {
1348                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1349                                 goto err;
1350                                 }
1351                         else
1352                                 {
1353                                 p-=2;
1354                                 i=(int)n;
1355                                 }
1356                         }
1357
1358                 if (n == 0L) /* the parameters are in the cert */
1359                         {
1360                         al=SSL_AD_HANDSHAKE_FAILURE;
1361                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1362                         goto f_err;
1363                         }
1364                 else
1365                         {
1366                         if (s->s3->tmp.dh == NULL)
1367                                 {
1368                                 al=SSL_AD_HANDSHAKE_FAILURE;
1369                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1370                                 goto f_err;
1371                                 }
1372                         else
1373                                 dh_srvr=s->s3->tmp.dh;
1374                         }
1375
1376                 pub=BN_bin2bn(p,i,NULL);
1377                 if (pub == NULL)
1378                         {
1379                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1380                         goto err;
1381                         }
1382
1383                 i=DH_compute_key(p,pub,dh_srvr);
1384
1385                 if (i <= 0)
1386                         {
1387                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1388                         goto err;
1389                         }
1390
1391                 DH_free(s->s3->tmp.dh);
1392                 s->s3->tmp.dh=NULL;
1393
1394                 BN_clear_free(pub);
1395                 pub=NULL;
1396                 s->session->master_key_length=
1397                         s->method->ssl3_enc->generate_master_secret(s,
1398                                 s->session->master_key,p,i);
1399                 }
1400         else
1401 #endif
1402                 {
1403                 al=SSL_AD_HANDSHAKE_FAILURE;
1404                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1405                 goto f_err;
1406                 }
1407
1408         return(1);
1409 f_err:
1410         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1411 #if !defined(NO_DH) || !defined(NO_RSA)
1412 err:
1413 #endif
1414         return(-1);
1415         }
1416
1417 static int ssl3_get_cert_verify(s)
1418 SSL *s;
1419         {
1420         EVP_PKEY *pkey=NULL;
1421         unsigned char *p;
1422         int al,ok,ret=0;
1423         long n;
1424         int type=0,i,j;
1425         X509 *peer;
1426
1427         n=ssl3_get_message(s,
1428                 SSL3_ST_SR_CERT_VRFY_A,
1429                 SSL3_ST_SR_CERT_VRFY_B,
1430                 -1,
1431                 512, /* 512? */
1432                 &ok);
1433
1434         if (!ok) return((int)n);
1435
1436         if (s->session->peer != NULL)
1437                 {
1438                 peer=s->session->peer;
1439                 pkey=X509_get_pubkey(peer);
1440                 type=X509_certificate_type(peer,pkey);
1441                 }
1442         else
1443                 {
1444                 peer=NULL;
1445                 pkey=NULL;
1446                 }
1447
1448         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1449                 {
1450                 s->s3->tmp.reuse_message=1;
1451                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1452                         {
1453                         al=SSL_AD_UNEXPECTED_MESSAGE;
1454                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1455                         goto f_err;
1456                         }
1457                 ret=1;
1458                 goto end;
1459                 }
1460
1461         if (peer == NULL)
1462                 {
1463                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1464                 al=SSL_AD_UNEXPECTED_MESSAGE;
1465                 goto f_err;
1466                 }
1467
1468         if (!(type & EVP_PKT_SIGN))
1469                 {
1470                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1471                 al=SSL_AD_ILLEGAL_PARAMETER;
1472                 goto f_err;
1473                 }
1474
1475         if (s->s3->change_cipher_spec)
1476                 {
1477                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1478                 al=SSL_AD_UNEXPECTED_MESSAGE;
1479                 goto f_err;
1480                 }
1481
1482         /* we now have a signature that we need to verify */
1483         p=(unsigned char *)s->init_buf->data;
1484         n2s(p,i);
1485         n-=2;
1486         if (i > n)
1487                 {
1488                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1489                 al=SSL_AD_DECODE_ERROR;
1490                 goto f_err;
1491                 }
1492
1493         j=EVP_PKEY_size(pkey);
1494         if ((i > j) || (n > j) || (n <= 0))
1495                 {
1496                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1497                 al=SSL_AD_DECODE_ERROR;
1498                 goto f_err;
1499                 }
1500
1501 #ifndef NO_RSA
1502         if (pkey->type == EVP_PKEY_RSA)
1503                 {
1504                 i=RSA_public_decrypt(i,p,p,pkey->pkey.rsa,RSA_PKCS1_PADDING);
1505                 if (i < 0)
1506                         {
1507                         al=SSL_AD_DECRYPT_ERROR;
1508                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1509                         goto f_err;
1510                         }
1511                 if ((i != (MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH)) ||
1512                         memcmp(&(s->s3->tmp.finish_md[0]),p,
1513                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH))
1514                         {
1515                         al=SSL_AD_DECRYPT_ERROR;
1516                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1517                         goto f_err;
1518                         }
1519                 }
1520         else
1521 #endif
1522 #ifndef NO_DSA
1523                 if (pkey->type == EVP_PKEY_DSA)
1524                 {
1525                 j=DSA_verify(pkey->save_type,
1526                         &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]),
1527                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1528                 if (j <= 0)
1529                         {
1530                         /* bad signature */
1531                         al=SSL_AD_DECRYPT_ERROR;
1532                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1533                         goto f_err;
1534                         }
1535                 }
1536         else
1537 #endif
1538                 {
1539                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1540                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1541                 goto f_err;
1542                 }
1543
1544
1545         ret=1;
1546         if (0)
1547                 {
1548 f_err:
1549                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1550                 }
1551 end:
1552         EVP_PKEY_free(pkey);
1553         return(ret);
1554         }
1555
1556 static int ssl3_get_client_certificate(s)
1557 SSL *s;
1558         {
1559         int i,ok,al,ret= -1;
1560         X509 *x=NULL;
1561         unsigned long l,nc,llen,n;
1562         unsigned char *p,*d,*q;
1563         STACK *sk=NULL;
1564
1565         n=ssl3_get_message(s,
1566                 SSL3_ST_SR_CERT_A,
1567                 SSL3_ST_SR_CERT_B,
1568                 -1,
1569 #if defined(MSDOS) && !defined(WIN32)
1570                 1024*30, /* 30k max cert list :-) */
1571 #else
1572                 1024*100, /* 100k max cert list :-) */
1573 #endif
1574                 &ok);
1575
1576         if (!ok) return((int)n);
1577
1578         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1579                 {
1580                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1581                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1582                         {
1583                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1584                         al=SSL_AD_HANDSHAKE_FAILURE;
1585                         goto f_err;
1586                         }
1587                 /* If tls asked for a client cert we must return a 0 list */
1588                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1589                         {
1590                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1591                         al=SSL_AD_UNEXPECTED_MESSAGE;
1592                         goto f_err;
1593                         }
1594                 s->s3->tmp.reuse_message=1;
1595                 return(1);
1596                 }
1597
1598         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1599                 {
1600                 al=SSL_AD_UNEXPECTED_MESSAGE;
1601                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1602                 goto f_err;
1603                 }
1604         d=p=(unsigned char *)s->init_buf->data;
1605
1606         if ((sk=sk_new_null()) == NULL)
1607                 {
1608                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1609                 goto err;
1610                 }
1611
1612         n2l3(p,llen);
1613         if (llen+3 != n)
1614                 {
1615                 al=SSL_AD_DECODE_ERROR;
1616                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1617                 goto f_err;
1618                 }
1619         for (nc=0; nc<llen; )
1620                 {
1621                 n2l3(p,l);
1622                 if ((l+nc+3) > llen)
1623                         {
1624                         al=SSL_AD_DECODE_ERROR;
1625                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1626                         goto f_err;
1627                         }
1628
1629                 q=p;
1630                 x=d2i_X509(NULL,&p,l);
1631                 if (x == NULL)
1632                         {
1633                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1634                         goto err;
1635                         }
1636                 if (p != (q+l))
1637                         {
1638                         al=SSL_AD_DECODE_ERROR;
1639                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1640                         goto f_err;
1641                         }
1642                 if (!sk_push(sk,(char *)x))
1643                         {
1644                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1645                         goto err;
1646                         }
1647                 x=NULL;
1648                 nc+=l+3;
1649                 }
1650
1651         if (sk_num(sk) <= 0)
1652                 {
1653                 /* TLS does not mind 0 certs returned */
1654                 if (s->version == SSL3_VERSION)
1655                         {
1656                         al=SSL_AD_HANDSHAKE_FAILURE;
1657                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1658                         goto f_err;
1659                         }
1660                 /* Fail for TLS only if we required a certificate */
1661                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1662                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1663                         {
1664                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1665                         al=SSL_AD_HANDSHAKE_FAILURE;
1666                         goto f_err;
1667                         }
1668                 }
1669         else
1670                 {
1671                 i=ssl_verify_cert_chain(s,sk);
1672                 if (!i)
1673                         {
1674                         al=ssl_verify_alarm_type(s->verify_result);
1675                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1676                         goto f_err;
1677                         }
1678                 }
1679
1680         /* This should not be needed */
1681         if (s->session->peer != NULL)
1682                 X509_free(s->session->peer);
1683         s->session->peer=(X509 *)sk_shift(sk);
1684
1685         ret=1;
1686         if (0)
1687                 {
1688 f_err:
1689                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1690                 }
1691 err:
1692         if (x != NULL) X509_free(x);
1693         if (sk != NULL) sk_pop_free(sk,X509_free);
1694         return(ret);
1695         }
1696
1697 int ssl3_send_server_certificate(s)
1698 SSL *s;
1699         {
1700         unsigned long l;
1701         X509 *x;
1702
1703         if (s->state == SSL3_ST_SW_CERT_A)
1704                 {
1705                 x=ssl_get_server_send_cert(s);
1706                 if (x == NULL)
1707                         {
1708                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1709                         return(0);
1710                         }
1711
1712                 l=ssl3_output_cert_chain(s,x);
1713                 s->state=SSL3_ST_SW_CERT_B;
1714                 s->init_num=(int)l;
1715                 s->init_off=0;
1716                 }
1717
1718         /* SSL3_ST_SW_CERT_B */
1719         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1720         }