ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #define REUSE_CIPHER_BUG
  60
  61 #include <stdio.h>
  62 #include <openssl/buffer.h>
  63 #include <openssl/rand.h>
  64 #include <openssl/objects.h>
  65 #include <openssl/evp.h>
  66 #include <openssl/x509.h>
  67 #include "ssl_locl.h"
  68
  69 static SSL_METHOD *ssl3_get_server_method(int ver);
  70 static int ssl3_get_client_hello(SSL *s);
  71 static int ssl3_send_server_hello(SSL *s);
  72 static int ssl3_send_server_key_exchange(SSL *s);
  73 static int ssl3_send_certificate_request(SSL *s);
  74 static int ssl3_send_server_done(SSL *s);
  75 static int ssl3_get_cert_verify(SSL *s);
  76 static int ssl3_get_client_key_exchange(SSL *s);
  77 static int ssl3_get_client_certificate(SSL *s);
  78 static int ssl3_send_hello_request(SSL *s);
  79
  80 static SSL_METHOD *ssl3_get_server_method(int ver)
  81         {
  82         if (ver == SSL3_VERSION)
  83                 return(SSLv3_server_method());
  84         else
  85                 return(NULL);
  86         }
  87
  88 SSL_METHOD *SSLv3_server_method(void)
  89         {
  90         static int init=1;
  91         static SSL_METHOD SSLv3_server_data;
  92
  93         if (init)
  94                 {
  95                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
  96                         sizeof(SSL_METHOD));
  97                 SSLv3_server_data.ssl_accept=ssl3_accept;
  98                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
  99                 init=0;
 100                 }
 101         return(&SSLv3_server_data);
 102         }
 103
 104 int ssl3_accept(SSL *s)
 105         {
 106         BUF_MEM *buf;
 107         unsigned long l,Time=time(NULL);
 108         void (*cb)()=NULL;
 109         long num1;
 110         int ret= -1;
 111         CERT *ct;
 112         int new_state,state,skip=0;
 113
 114         RAND_seed(&Time,sizeof(Time));
 115         ERR_clear_error();
 116         clear_sys_error();
 117
 118         if (s->info_callback != NULL)
 119                 cb=s->info_callback;
 120         else if (s->ctx->info_callback != NULL)
 121                 cb=s->ctx->info_callback;
 122
 123         /* init things to blank */
 124         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 125         s->in_handshake++;
 126
 127 #ifdef undef
 128         /* FIX THIS EAY EAY EAY */
 129         /* we don't actually need a cert, we just need a cert or a DH_tmp */
 130         if (((s->session == NULL) || (s->session->cert == NULL)) &&
 131                 (s->cert == NULL))
 132                 {
 133                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 134                 ret= -1;
 135                 goto end;
 136                 }
 137 #endif
 138
 139         for (;;)
 140                 {
 141                 state=s->state;
 142
 143                 switch (s->state)
 144                         {
 145                 case SSL_ST_RENEGOTIATE:
 146                         s->new_session=1;
 147                         /* s->state=SSL_ST_ACCEPT; */
 148
 149                 case SSL_ST_BEFORE:
 150                 case SSL_ST_ACCEPT:
 151                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 152                 case SSL_ST_OK|SSL_ST_ACCEPT:
 153
 154                         s->server=1;
 155                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 156
 157                         if ((s->version>>8) != 3)
 158                                 abort();
 159                         /* s->version=SSL3_VERSION; */
 160                         s->type=SSL_ST_ACCEPT;
 161
 162                         if (s->init_buf == NULL)
 163                                 {
 164                                 if ((buf=BUF_MEM_new()) == NULL)
 165                                         {
 166                                         ret= -1;
 167                                         goto end;
 168                                         }
 169                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 170                                         {
 171                                         ret= -1;
 172                                         goto end;
 173                                         }
 174                                 s->init_buf=buf;
 175                                 }
 176
 177                         if (!ssl3_setup_buffers(s))
 178                                 {
 179                                 ret= -1;
 180                                 goto end;
 181                                 }
 182
 183                         /* Ok, we now need to push on a buffering BIO so that
 184                          * the output is sent in a way that TCP likes :-)
 185                          */
 186                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 187
 188                         s->init_num=0;
 189
 190                         if (s->state != SSL_ST_RENEGOTIATE)
 191                                 {
 192                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 193                                 ssl3_init_finished_mac(s);
 194                                 s->ctx->stats.sess_accept++;
 195                                 }
 196                         else
 197                                 {
 198                                 s->ctx->stats.sess_accept_renegotiate++;
 199                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 200                                 }
 201                         break;
 202
 203                 case SSL3_ST_SW_HELLO_REQ_A:
 204                 case SSL3_ST_SW_HELLO_REQ_B:
 205
 206                         s->shutdown=0;
 207                         ret=ssl3_send_hello_request(s);
 208                         if (ret <= 0) goto end;
 209                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 210                         s->state=SSL3_ST_SW_FLUSH;
 211                         s->init_num=0;
 212
 213                         ssl3_init_finished_mac(s);
 214                         break;
 215
 216                 case SSL3_ST_SW_HELLO_REQ_C:
 217                         s->state=SSL_ST_OK;
 218                         ret=1;
 219                         goto end;
 220                         /* break; */
 221
 222                 case SSL3_ST_SR_CLNT_HELLO_A:
 223                 case SSL3_ST_SR_CLNT_HELLO_B:
 224                 case SSL3_ST_SR_CLNT_HELLO_C:
 225
 226                         s->shutdown=0;
 227                         ret=ssl3_get_client_hello(s);
 228                         if (ret <= 0) goto end;
 229                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 230                         s->init_num=0;
 231                         break;
 232
 233                 case SSL3_ST_SW_SRVR_HELLO_A:
 234                 case SSL3_ST_SW_SRVR_HELLO_B:
 235                         ret=ssl3_send_server_hello(s);
 236                         if (ret <= 0) goto end;
 237
 238                         if (s->hit)
 239                                 s->state=SSL3_ST_SW_CHANGE_A;
 240                         else
 241                                 s->state=SSL3_ST_SW_CERT_A;
 242                         s->init_num=0;
 243                         break;
 244
 245                 case SSL3_ST_SW_CERT_A:
 246                 case SSL3_ST_SW_CERT_B:
 247                         /* Check if it is anon DH */
 248                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 249                                 {
 250                                 ret=ssl3_send_server_certificate(s);
 251                                 if (ret <= 0) goto end;
 252                                 }
 253                         else
 254                                 skip=1;
 255                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 256                         s->init_num=0;
 257                         break;
 258
 259                 case SSL3_ST_SW_KEY_EXCH_A:
 260                 case SSL3_ST_SW_KEY_EXCH_B:
 261                         l=s->s3->tmp.new_cipher->algorithms;
 262                         if (s->session->cert == NULL)
 263                                 {
 264                                 if (s->cert != NULL)
 265                                         {
 266                                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 267                                         s->session->cert=s->cert;
 268                                         }
 269                                 else
 270                                         {
 271                                         CRYPTO_add(&s->ctx->default_cert->references,1,CRYPTO_LOCK_SSL_CERT);
 272                                         s->session->cert=s->ctx->default_cert;
 273                                         }
 274                                 }
 275                         ct=s->session->cert;
 276
 277                         /* clear this, it may get reset by
 278                          * send_server_key_exchange */
 279                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 280                                 s->s3->tmp.use_rsa_tmp=1;
 281                         else
 282                                 s->s3->tmp.use_rsa_tmp=0;
 283
 284                         /* only send if a DH key exchange, fortezza or
 285                          * RSA but we have a sign only certificate */
 286                         if (s->s3->tmp.use_rsa_tmp
 287                             || (l & (SSL_DH|SSL_kFZA))
 288                             || ((l & SSL_kRSA)
 289                                 && (ct->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 290                                     || (SSL_IS_EXPORT(l)
 291                                         && EVP_PKEY_size(ct->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_EXPORT_PKEYLENGTH(l)
 292                                         )
 293                                     )
 294                                 )
 295                             )
 296                                 {
 297                                 ret=ssl3_send_server_key_exchange(s);
 298                                 if (ret <= 0) goto end;
 299                                 }
 300                         else
 301                                 skip=1;
 302
 303                         s->state=SSL3_ST_SW_CERT_REQ_A;
 304                         s->init_num=0;
 305                         break;
 306
 307                 case SSL3_ST_SW_CERT_REQ_A:
 308                 case SSL3_ST_SW_CERT_REQ_B:
 309                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 310                                 ((s->session->peer != NULL) &&
 311                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 312                                 {
 313                                 /* no cert request */
 314                                 skip=1;
 315                                 s->s3->tmp.cert_request=0;
 316                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 317                                 }
 318                         else
 319                                 {
 320                                 s->s3->tmp.cert_request=1;
 321                                 ret=ssl3_send_certificate_request(s);
 322                                 if (ret <= 0) goto end;
 323                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 324                                 s->init_num=0;
 325                                 }
 326                         break;
 327
 328                 case SSL3_ST_SW_SRVR_DONE_A:
 329                 case SSL3_ST_SW_SRVR_DONE_B:
 330                         ret=ssl3_send_server_done(s);
 331                         if (ret <= 0) goto end;
 332                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 333                         s->state=SSL3_ST_SW_FLUSH;
 334                         s->init_num=0;
 335                         break;
 336
 337                 case SSL3_ST_SW_FLUSH:
 338                         /* number of bytes to be flushed */
 339                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 340                         if (num1 > 0)
 341                                 {
 342                                 s->rwstate=SSL_WRITING;
 343                                 num1=BIO_flush(s->wbio);
 344                                 if (num1 <= 0) { ret= -1; goto end; }
 345                                 s->rwstate=SSL_NOTHING;
 346                                 }
 347
 348                         s->state=s->s3->tmp.next_state;
 349                         break;
 350
 351                 case SSL3_ST_SR_CERT_A:
 352                 case SSL3_ST_SR_CERT_B:
 353                         /* could be sent for a DH cert, even if we
 354                          * have not asked for it :-) */
 355                         ret=ssl3_get_client_certificate(s);
 356                         if (ret <= 0) goto end;
 357                         s->init_num=0;
 358                         s->state=SSL3_ST_SR_KEY_EXCH_A;
 359                         break;
 360
 361                 case SSL3_ST_SR_KEY_EXCH_A:
 362                 case SSL3_ST_SR_KEY_EXCH_B:
 363                         ret=ssl3_get_client_key_exchange(s);
 364                         if (ret <= 0) goto end;
 365                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 366                         s->init_num=0;
 367
 368                         /* We need to get hashes here so if there is
 369                          * a client cert, it can be verified */
 370                         s->method->ssl3_enc->cert_verify_mac(s,
 371                                 &(s->s3->finish_dgst1),
 372                                 &(s->s3->tmp.finish_md[0]));
 373                         s->method->ssl3_enc->cert_verify_mac(s,
 374                                 &(s->s3->finish_dgst2),
 375                                 &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]));
 376
 377                         break;
 378
 379                 case SSL3_ST_SR_CERT_VRFY_A:
 380                 case SSL3_ST_SR_CERT_VRFY_B:
 381
 382                         /* we should decide if we expected this one */
 383                         ret=ssl3_get_cert_verify(s);
 384                         if (ret <= 0) goto end;
 385
 386                         s->state=SSL3_ST_SR_FINISHED_A;
 387                         s->init_num=0;
 388                         break;
 389
 390                 case SSL3_ST_SR_FINISHED_A:
 391                 case SSL3_ST_SR_FINISHED_B:
 392                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 393                                 SSL3_ST_SR_FINISHED_B);
 394                         if (ret <= 0) goto end;
 395                         if (s->hit)
 396                                 s->state=SSL_ST_OK;
 397                         else
 398                                 s->state=SSL3_ST_SW_CHANGE_A;
 399                         s->init_num=0;
 400                         break;
 401
 402                 case SSL3_ST_SW_CHANGE_A:
 403                 case SSL3_ST_SW_CHANGE_B:
 404
 405                         s->session->cipher=s->s3->tmp.new_cipher;
 406                         if (!s->method->ssl3_enc->setup_key_block(s))
 407                                 { ret= -1; goto end; }
 408
 409                         ret=ssl3_send_change_cipher_spec(s,
 410                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 411
 412                         if (ret <= 0) goto end;
 413                         s->state=SSL3_ST_SW_FINISHED_A;
 414                         s->init_num=0;
 415
 416                         if (!s->method->ssl3_enc->change_cipher_state(s,
 417                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 418                                 {
 419                                 ret= -1;
 420                                 goto end;
 421                                 }
 422
 423                         break;
 424
 425                 case SSL3_ST_SW_FINISHED_A:
 426                 case SSL3_ST_SW_FINISHED_B:
 427                         ret=ssl3_send_finished(s,
 428                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 429                                 s->method->ssl3_enc->server_finished,
 430                                 s->method->ssl3_enc->server_finished_len);
 431                         if (ret <= 0) goto end;
 432                         s->state=SSL3_ST_SW_FLUSH;
 433                         if (s->hit)
 434                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 435                         else
 436                                 s->s3->tmp.next_state=SSL_ST_OK;
 437                         s->init_num=0;
 438                         break;
 439
 440                 case SSL_ST_OK:
 441                         /* clean a few things up */
 442                         ssl3_cleanup_key_block(s);
 443
 444                         BUF_MEM_free(s->init_buf);
 445                         s->init_buf=NULL;
 446
 447                         /* remove buffering on output */
 448                         ssl_free_wbio_buffer(s);
 449
 450                         s->new_session=0;
 451                         s->init_num=0;
 452
 453                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 454
 455                         s->ctx->stats.sess_accept_good++;
 456                         /* s->server=1; */
 457                         s->handshake_func=ssl3_accept;
 458                         ret=1;
 459
 460                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 461
 462                         goto end;
 463                         /* break; */
 464
 465                 default:
 466                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 467                         ret= -1;
 468                         goto end;
 469                         /* break; */
 470                         }
 471
 472                 if (!s->s3->tmp.reuse_message && !skip)
 473                         {
 474                         if (s->debug)
 475                                 {
 476                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 477                                         goto end;
 478                                 }
 479
 480
 481                         if ((cb != NULL) && (s->state != state))
 482                                 {
 483                                 new_state=s->state;
 484                                 s->state=state;
 485                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 486                                 s->state=new_state;
 487                                 }
 488                         }
 489                 skip=0;
 490                 }
 491 end:
 492         /* BIO_flush(s->wbio); */
 493
 494         if (cb != NULL)
 495                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 496         s->in_handshake--;
 497         return(ret);
 498         }
 499
 500 static int ssl3_send_hello_request(SSL *s)
 501         {
 502         unsigned char *p;
 503
 504         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 505                 {
 506                 p=(unsigned char *)s->init_buf->data;
 507                 *(p++)=SSL3_MT_CLIENT_REQUEST;
 508                 *(p++)=0;
 509                 *(p++)=0;
 510                 *(p++)=0;
 511
 512                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 513                 /* number of bytes to write */
 514                 s->init_num=4;
 515                 s->init_off=0;
 516                 }
 517
 518         /* SSL3_ST_SW_HELLO_REQ_B */
 519         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 520         }
 521
 522 static int ssl3_get_client_hello(SSL *s)
 523         {
 524         int i,j,ok,al,ret= -1;
 525         long n;
 526         unsigned long id;
 527         unsigned char *p,*d,*q;
 528         SSL_CIPHER *c;
 529         SSL_COMP *comp=NULL;
 530         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 531
 532         /* We do this so that we will respond with our native type.
 533          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 534          * This down switching should be handled by a different method.
 535          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 536          * TLSv1.
 537          */
 538         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 539                 {
 540                 s->first_packet=1;
 541                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 542                 }
 543         n=ssl3_get_message(s,
 544                 SSL3_ST_SR_CLNT_HELLO_B,
 545                 SSL3_ST_SR_CLNT_HELLO_C,
 546                 SSL3_MT_CLIENT_HELLO,
 547                 SSL3_RT_MAX_PLAIN_LENGTH,
 548                 &ok);
 549
 550         if (!ok) return((int)n);
 551         d=p=(unsigned char *)s->init_buf->data;
 552
 553         /* The version number has already been checked in ssl3_get_message.
 554          * I a native TLSv1/SSLv3 method, the match must be correct except
 555          * perhaps for the first message */
 556 /*      s->client_version=(((int)p[0])<<8)|(int)p[1]; */
 557         p+=2;
 558
 559         /* load the client random */
 560         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 561         p+=SSL3_RANDOM_SIZE;
 562
 563         /* get the session-id */
 564         j= *(p++);
 565
 566         s->hit=0;
 567         if (j == 0)
 568                 {
 569                 if (!ssl_get_new_session(s,1))
 570                         goto err;
 571                 }
 572         else
 573                 {
 574                 i=ssl_get_prev_session(s,p,j);
 575                 if (i == 1)
 576                         { /* previous session */
 577                         s->hit=1;
 578                         }
 579                 else
 580                         {
 581                         if (!ssl_get_new_session(s,1))
 582                                 goto err;
 583                         }
 584                 }
 585
 586         p+=j;
 587         n2s(p,i);
 588         if ((i == 0) && (j != 0))
 589                 {
 590                 /* we need a cipher if we are not resuming a session */
 591                 al=SSL_AD_ILLEGAL_PARAMETER;
 592                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 593                 goto f_err;
 594                 }
 595         if ((i+p) > (d+n))
 596                 {
 597                 /* not enough data */
 598                 al=SSL_AD_DECODE_ERROR;
 599                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 600                 goto f_err;
 601                 }
 602         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 603                 == NULL))
 604                 {
 605                 goto err;
 606                 }
 607         p+=i;
 608
 609         /* If it is a hit, check that the cipher is in the list */
 610         if ((s->hit) && (i > 0))
 611                 {
 612                 j=0;
 613                 id=s->session->cipher->id;
 614
 615 #ifdef CIPHER_DEBUG
 616                 printf("client sent %d ciphers\n",sk_num(ciphers));
 617 #endif
 618                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 619                         {
 620                         c=sk_SSL_CIPHER_value(ciphers,i);
 621 #ifdef CIPHER_DEBUG
 622                         printf("client [%2d of %2d]:%s\n",
 623                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 624 #endif
 625                         if (c->id == id)
 626                                 {
 627                                 j=1;
 628                                 break;
 629                                 }
 630                         }
 631                 if (j == 0)
 632                         {
 633                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 634                                 {
 635                                 /* Very bad for multi-threading.... */
 636                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 637                                                                        0);
 638                                 }
 639                         else
 640                                 {
 641                                 /* we need to have the cipher in the cipher
 642                                  * list if we are asked to reuse it */
 643                                 al=SSL_AD_ILLEGAL_PARAMETER;
 644                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 645                                 goto f_err;
 646                                 }
 647                         }
 648                 }
 649
 650         /* compression */
 651         i= *(p++);
 652         q=p;
 653         for (j=0; j<i; j++)
 654                 {
 655                 if (p[j] == 0) break;
 656                 }
 657
 658         p+=i;
 659         if (j >= i)
 660                 {
 661                 /* no compress */
 662                 al=SSL_AD_DECODE_ERROR;
 663                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 664                 goto f_err;
 665                 }
 666
 667         /* Worst case, we will use the NULL compression, but if we have other
 668          * options, we will now look for them.  We have i-1 compression
 669          * algorithms from the client, starting at q. */
 670         s->s3->tmp.new_compression=NULL;
 671         if (s->ctx->comp_methods != NULL)
 672                 { /* See if we have a match */
 673                 int m,nn,o,v,done=0;
 674
 675                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 676                 for (m=0; m<nn; m++)
 677                         {
 678                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 679                         v=comp->id;
 680                         for (o=0; o<i; o++)
 681                                 {
 682                                 if (v == q[o])
 683                                         {
 684                                         done=1;
 685                                         break;
 686                                         }
 687                                 }
 688                         if (done) break;
 689                         }
 690                 if (done)
 691                         s->s3->tmp.new_compression=comp;
 692                 else
 693                         comp=NULL;
 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         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 710          * pick a cipher */
 711
 712         if (!s->hit)
 713                 {
 714                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 715                 if (s->session->ciphers != NULL)
 716                         sk_SSL_CIPHER_free(s->session->ciphers);
 717                 s->session->ciphers=ciphers;
 718                 if (ciphers == NULL)
 719                         {
 720                         al=SSL_AD_ILLEGAL_PARAMETER;
 721                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 722                         goto f_err;
 723                         }
 724                 ciphers=NULL;
 725                 c=ssl3_choose_cipher(s,s->session->ciphers,
 726                                      ssl_get_ciphers_by_id(s));
 727
 728                 if (c == NULL)
 729                         {
 730                         al=SSL_AD_HANDSHAKE_FAILURE;
 731                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 732                         goto f_err;
 733                         }
 734                 s->s3->tmp.new_cipher=c;
 735                 }
 736         else
 737                 {
 738                 /* Session-id reuse */
 739 #ifdef REUSE_CIPHER_BUG
 740                 STACK_OF(SSL_CIPHER) *sk;
 741                 SSL_CIPHER *nc=NULL;
 742                 SSL_CIPHER *ec=NULL;
 743
 744                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 745                         {
 746                         sk=s->session->ciphers;
 747                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 748                                 {
 749                                 c=sk_SSL_CIPHER_value(sk,i);
 750                                 if (c->algorithms & SSL_eNULL)
 751                                         nc=c;
 752                                 if (SSL_C_IS_EXPORT(c))
 753                                         ec=c;
 754                                 }
 755                         if (nc != NULL)
 756                                 s->s3->tmp.new_cipher=nc;
 757                         else if (ec != NULL)
 758                                 s->s3->tmp.new_cipher=ec;
 759                         else
 760                                 s->s3->tmp.new_cipher=s->session->cipher;
 761                         }
 762                 else
 763 #endif
 764                 s->s3->tmp.new_cipher=s->session->cipher;
 765                 }
 766
 767         /* we now have the following setup.
 768          * client_random
 769          * cipher_list          - our prefered list of ciphers
 770          * ciphers              - the clients prefered list of ciphers
 771          * compression          - basically ignored right now
 772          * ssl version is set   - sslv3
 773          * s->session           - The ssl session has been setup.
 774          * s->hit               - sesson reuse flag
 775          * s->tmp.new_cipher    - the new cipher to use.
 776          */
 777
 778         ret=1;
 779         if (0)
 780                 {
 781 f_err:
 782                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 783                 }
 784 err:
 785         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 786         return(ret);
 787         }
 788
 789 static int ssl3_send_server_hello(SSL *s)
 790         {
 791         unsigned char *buf;
 792         unsigned char *p,*d;
 793         int i,sl;
 794         unsigned long l,Time;
 795
 796         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 797                 {
 798                 buf=(unsigned char *)s->init_buf->data;
 799                 p=s->s3->server_random;
 800                 Time=time(NULL);                        /* Time */
 801                 l2n(Time,p);
 802                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 803                 /* Do the message type and length last */
 804                 d=p= &(buf[4]);
 805
 806                 *(p++)=s->version>>8;
 807                 *(p++)=s->version&0xff;
 808
 809                 /* Random stuff */
 810                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 811                 p+=SSL3_RANDOM_SIZE;
 812
 813                 /* now in theory we have 3 options to sending back the
 814                  * session id.  If it is a re-use, we send back the
 815                  * old session-id, if it is a new session, we send
 816                  * back the new session-id or we send back a 0 length
 817                  * session-id if we want it to be single use.
 818                  * Currently I will not implement the '0' length session-id
 819                  * 12-Jan-98 - I'll now support the '0' length stuff.
 820                  */
 821                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 822                         s->session->session_id_length=0;
 823
 824                 sl=s->session->session_id_length;
 825                 *(p++)=sl;
 826                 memcpy(p,s->session->session_id,sl);
 827                 p+=sl;
 828
 829                 /* put the cipher */
 830                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 831                 p+=i;
 832
 833                 /* put the compression method */
 834                 if (s->s3->tmp.new_compression == NULL)
 835                         *(p++)=0;
 836                 else
 837                         *(p++)=s->s3->tmp.new_compression->id;
 838
 839                 /* do the header */
 840                 l=(p-d);
 841                 d=buf;
 842                 *(d++)=SSL3_MT_SERVER_HELLO;
 843                 l2n3(l,d);
 844
 845                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 846                 /* number of bytes to write */
 847                 s->init_num=p-buf;
 848                 s->init_off=0;
 849                 }
 850
 851         /* SSL3_ST_CW_CLNT_HELLO_B */
 852         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 853         }
 854
 855 static int ssl3_send_server_done(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(SSL *s)
 880         {
 881 #ifndef NO_RSA
 882         unsigned char *q;
 883         int j,num;
 884         RSA *rsa;
 885         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 886 #endif
 887 #ifndef NO_DH
 888         DH *dh,*dhp;
 889 #endif
 890         EVP_PKEY *pkey;
 891         unsigned char *p,*d;
 892         int al,i;
 893         unsigned long type;
 894         int n;
 895         CERT *cert;
 896         BIGNUM *r[4];
 897         int nr[4],kn;
 898         BUF_MEM *buf;
 899         EVP_MD_CTX md_ctx;
 900
 901         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 902                 {
 903                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 904                 cert=s->session->cert;
 905
 906                 buf=s->init_buf;
 907
 908                 r[0]=r[1]=r[2]=r[3]=NULL;
 909                 n=0;
 910 #ifndef NO_RSA
 911                 if (type & SSL_kRSA)
 912                         {
 913                         rsa=cert->rsa_tmp;
 914                         if ((rsa == NULL) && (s->ctx->default_cert->rsa_tmp_cb != NULL))
 915                                 {
 916                                 rsa=s->ctx->default_cert->rsa_tmp_cb(s,
 917                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 918                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 919                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 920                                 cert->rsa_tmp=rsa;
 921                                 }
 922                         if (rsa == NULL)
 923                                 {
 924                                 al=SSL_AD_HANDSHAKE_FAILURE;
 925                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 926                                 goto f_err;
 927                                 }
 928                         r[0]=rsa->n;
 929                         r[1]=rsa->e;
 930                         s->s3->tmp.use_rsa_tmp=1;
 931                         }
 932                 else
 933 #endif
 934 #ifndef NO_DH
 935                         if (type & SSL_kEDH)
 936                         {
 937                         dhp=cert->dh_tmp;
 938                         if ((dhp == NULL) && (cert->dh_tmp_cb != NULL))
 939                                 dhp=cert->dh_tmp_cb(s,
 940                                       !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 941                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 942                         if (dhp == NULL)
 943                                 {
 944                                 al=SSL_AD_HANDSHAKE_FAILURE;
 945                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 946                                 goto f_err;
 947                                 }
 948                         if ((dh=DHparams_dup(dhp)) == NULL)
 949                                 {
 950                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 951                                 goto err;
 952                                 }
 953
 954                         s->s3->tmp.dh=dh;
 955                         if ((dhp->pub_key == NULL ||
 956                              dhp->priv_key == NULL ||
 957                              (s->options & SSL_OP_SINGLE_DH_USE)))
 958                                 {
 959                                 if(!DH_generate_key(dh))
 960                                     {
 961                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
 962                                            ERR_R_DH_LIB);
 963                                     goto err;
 964                                     }
 965                                 }
 966                         else
 967                                 {
 968                                 dh->pub_key=BN_dup(dhp->pub_key);
 969                                 dh->priv_key=BN_dup(dhp->priv_key);
 970                                 if ((dh->pub_key == NULL) ||
 971                                         (dh->priv_key == NULL))
 972                                         {
 973                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 974                                         goto err;
 975                                         }
 976                                 }
 977                         r[0]=dh->p;
 978                         r[1]=dh->g;
 979                         r[2]=dh->pub_key;
 980                         }
 981                 else
 982 #endif
 983                         {
 984                         al=SSL_AD_HANDSHAKE_FAILURE;
 985                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 986                         goto f_err;
 987                         }
 988                 for (i=0; r[i] != NULL; i++)
 989                         {
 990                         nr[i]=BN_num_bytes(r[i]);
 991                         n+=2+nr[i];
 992                         }
 993
 994                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 995                         {
 996                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 997                                 == NULL)
 998                                 {
 999                                 al=SSL_AD_DECODE_ERROR;
1000                                 goto f_err;
1001                                 }
1002                         kn=EVP_PKEY_size(pkey);
1003                         }
1004                 else
1005                         {
1006                         pkey=NULL;
1007                         kn=0;
1008                         }
1009
1010                 if (!BUF_MEM_grow(buf,n+4+kn))
1011                         {
1012                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1013                         goto err;
1014                         }
1015                 d=(unsigned char *)s->init_buf->data;
1016                 p= &(d[4]);
1017
1018                 for (i=0; r[i] != NULL; i++)
1019                         {
1020                         s2n(nr[i],p);
1021                         BN_bn2bin(r[i],p);
1022                         p+=nr[i];
1023                         }
1024
1025                 /* not anonymous */
1026                 if (pkey != NULL)
1027                         {
1028                         /* n is the length of the params, they start at &(d[4])
1029                          * and p points to the space at the end. */
1030 #ifndef NO_RSA
1031                         if (pkey->type == EVP_PKEY_RSA)
1032                                 {
1033                                 q=md_buf;
1034                                 j=0;
1035                                 for (num=2; num > 0; num--)
1036                                         {
1037                                         EVP_DigestInit(&md_ctx,(num == 2)
1038                                                 ?s->ctx->md5:s->ctx->sha1);
1039                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1040                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1041                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1042                                         EVP_DigestFinal(&md_ctx,q,
1043                                                 (unsigned int *)&i);
1044                                         q+=i;
1045                                         j+=i;
1046                                         }
1047                                 i=RSA_private_encrypt(j,md_buf,&(p[2]),
1048                                         pkey->pkey.rsa,RSA_PKCS1_PADDING);
1049                                 if (i <= 0)
1050                                         {
1051                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1052                                         goto err;
1053                                         }
1054                                 s2n(i,p);
1055                                 n+=i+2;
1056                                 }
1057                         else
1058 #endif
1059 #if !defined(NO_DSA)
1060                                 if (pkey->type == EVP_PKEY_DSA)
1061                                 {
1062                                 /* lets do DSS */
1063                                 EVP_SignInit(&md_ctx,EVP_dss1());
1064                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1065                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1066                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1067                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1068                                         (unsigned int *)&i,pkey))
1069                                         {
1070                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1071                                         goto err;
1072                                         }
1073                                 s2n(i,p);
1074                                 n+=i+2;
1075                                 }
1076                         else
1077 #endif
1078                                 {
1079                                 /* Is this error check actually needed? */
1080                                 al=SSL_AD_HANDSHAKE_FAILURE;
1081                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1082                                 goto f_err;
1083                                 }
1084                         }
1085
1086                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1087                 l2n3(n,d);
1088
1089                 /* we should now have things packed up, so lets send
1090                  * it off */
1091                 s->init_num=n+4;
1092                 s->init_off=0;
1093                 }
1094
1095         /* SSL3_ST_SW_KEY_EXCH_B */
1096         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1097 f_err:
1098         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1099 err:
1100         return(-1);
1101         }
1102
1103 static int ssl3_send_certificate_request(SSL *s)
1104         {
1105         unsigned char *p,*d;
1106         int i,j,nl,off,n;
1107         STACK_OF(X509_NAME) *sk=NULL;
1108         X509_NAME *name;
1109         BUF_MEM *buf;
1110
1111         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1112                 {
1113                 buf=s->init_buf;
1114
1115                 d=p=(unsigned char *)&(buf->data[4]);
1116
1117                 /* get the list of acceptable cert types */
1118                 p++;
1119                 n=ssl3_get_req_cert_type(s,p);
1120                 d[0]=n;
1121                 p+=n;
1122                 n++;
1123
1124                 off=n;
1125                 p+=2;
1126                 n+=2;
1127
1128                 sk=SSL_get_client_CA_list(s);
1129                 nl=0;
1130                 if (sk != NULL)
1131                         {
1132                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1133                                 {
1134                                 name=sk_X509_NAME_value(sk,i);
1135                                 j=i2d_X509_NAME(name,NULL);
1136                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1137                                         {
1138                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1139                                         goto err;
1140                                         }
1141                                 p=(unsigned char *)&(buf->data[4+n]);
1142                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1143                                         {
1144                                         s2n(j,p);
1145                                         i2d_X509_NAME(name,&p);
1146                                         n+=2+j;
1147                                         nl+=2+j;
1148                                         }
1149                                 else
1150                                         {
1151                                         d=p;
1152                                         i2d_X509_NAME(name,&p);
1153                                         j-=2; s2n(j,d); j+=2;
1154                                         n+=j;
1155                                         nl+=j;
1156                                         }
1157                                 }
1158                         }
1159                 /* else no CA names */
1160                 p=(unsigned char *)&(buf->data[4+off]);
1161                 s2n(nl,p);
1162
1163                 d=(unsigned char *)buf->data;
1164                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1165                 l2n3(n,d);
1166
1167                 /* we should now have things packed up, so lets send
1168                  * it off */
1169
1170                 s->init_num=n+4;
1171                 s->init_off=0;
1172                 }
1173
1174         /* SSL3_ST_SW_CERT_REQ_B */
1175         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1176 err:
1177         return(-1);
1178         }
1179
1180 static int ssl3_get_client_key_exchange(SSL *s)
1181         {
1182         int i,al,ok;
1183         long n;
1184         unsigned long l;
1185         unsigned char *p;
1186 #ifndef NO_RSA
1187         RSA *rsa=NULL;
1188         EVP_PKEY *pkey=NULL;
1189 #endif
1190 #ifndef NO_DH
1191         BIGNUM *pub=NULL;
1192         DH *dh_srvr;
1193 #endif
1194
1195         n=ssl3_get_message(s,
1196                 SSL3_ST_SR_KEY_EXCH_A,
1197                 SSL3_ST_SR_KEY_EXCH_B,
1198                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1199                 400, /* ???? */
1200                 &ok);
1201
1202         if (!ok) return((int)n);
1203         p=(unsigned char *)s->init_buf->data;
1204
1205         l=s->s3->tmp.new_cipher->algorithms;
1206
1207 #ifndef NO_RSA
1208         if (l & SSL_kRSA)
1209                 {
1210                 /* FIX THIS UP EAY EAY EAY EAY */
1211                 if (s->s3->tmp.use_rsa_tmp)
1212                         {
1213                         if ((s->session->cert != NULL) &&
1214                                 (s->session->cert->rsa_tmp != NULL))
1215                                 rsa=s->session->cert->rsa_tmp;
1216                         else if ((s->ctx->default_cert != NULL) &&
1217                                 (s->ctx->default_cert->rsa_tmp != NULL))
1218                                 rsa=s->ctx->default_cert->rsa_tmp;
1219                         /* Don't do a callback because rsa_tmp should
1220                          * be sent already */
1221                         if (rsa == NULL)
1222                                 {
1223                                 al=SSL_AD_HANDSHAKE_FAILURE;
1224                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1225                                 goto f_err;
1226
1227                                 }
1228                         }
1229                 else
1230                         {
1231                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1232                         if (    (pkey == NULL) ||
1233                                 (pkey->type != EVP_PKEY_RSA) ||
1234                                 (pkey->pkey.rsa == NULL))
1235                                 {
1236                                 al=SSL_AD_HANDSHAKE_FAILURE;
1237                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1238                                 goto f_err;
1239                                 }
1240                         rsa=pkey->pkey.rsa;
1241                         }
1242
1243                 /* TLS */
1244                 if (s->version > SSL3_VERSION)
1245                         {
1246                         n2s(p,i);
1247                         if (n != i+2)
1248                                 {
1249                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1250                                         {
1251                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1252                                         goto err;
1253                                         }
1254                                 else
1255                                         p-=2;
1256                                 }
1257                         else
1258                                 n=i;
1259                         }
1260
1261                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1262
1263 #if 1
1264                 /* If a bad decrypt, use a random master key */
1265                 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1266                         ((p[0] != (s->client_version>>8)) ||
1267                          (p[1] != (s->client_version & 0xff))))
1268                         {
1269                         int bad=1;
1270
1271                         if ((i == SSL_MAX_MASTER_KEY_LENGTH) &&
1272                                 (p[0] == (s->version>>8)) &&
1273                                 (p[1] == 0))
1274                                 {
1275                                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
1276                                         bad=0;
1277                                 }
1278                         if (bad)
1279                                 {
1280                                 p[0]=(s->version>>8);
1281                                 p[1]=(s->version & 0xff);
1282                                 RAND_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1283                                 i=SSL_MAX_MASTER_KEY_LENGTH;
1284                                 }
1285                         /* else, an SSLeay bug, ssl only server, tls client */
1286                         }
1287 #else
1288                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1289                         {
1290                         al=SSL_AD_DECODE_ERROR;
1291                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1292                         goto f_err;
1293                         }
1294
1295                 if ((p[0] != (s->version>>8)) || (p[1] != (s->version & 0xff)))
1296                         {
1297                         al=SSL_AD_DECODE_ERROR;
1298                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1299                         goto f_err;
1300                         }
1301 #endif
1302
1303                 s->session->master_key_length=
1304                         s->method->ssl3_enc->generate_master_secret(s,
1305                                 s->session->master_key,
1306                                 p,i);
1307                 memset(p,0,i);
1308                 }
1309         else
1310 #endif
1311 #ifndef NO_DH
1312                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1313                 {
1314                 n2s(p,i);
1315                 if (n != i+2)
1316                         {
1317                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1318                                 {
1319                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1320                                 goto err;
1321                                 }
1322                         else
1323                                 {
1324                                 p-=2;
1325                                 i=(int)n;
1326                                 }
1327                         }
1328
1329                 if (n == 0L) /* the parameters are in the cert */
1330                         {
1331                         al=SSL_AD_HANDSHAKE_FAILURE;
1332                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1333                         goto f_err;
1334                         }
1335                 else
1336                         {
1337                         if (s->s3->tmp.dh == NULL)
1338                                 {
1339                                 al=SSL_AD_HANDSHAKE_FAILURE;
1340                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1341                                 goto f_err;
1342                                 }
1343                         else
1344                                 dh_srvr=s->s3->tmp.dh;
1345                         }
1346
1347                 pub=BN_bin2bn(p,i,NULL);
1348                 if (pub == NULL)
1349                         {
1350                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1351                         goto err;
1352                         }
1353
1354                 i=DH_compute_key(p,pub,dh_srvr);
1355
1356                 if (i <= 0)
1357                         {
1358                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1359                         goto err;
1360                         }
1361
1362                 DH_free(s->s3->tmp.dh);
1363                 s->s3->tmp.dh=NULL;
1364
1365                 BN_clear_free(pub);
1366                 pub=NULL;
1367                 s->session->master_key_length=
1368                         s->method->ssl3_enc->generate_master_secret(s,
1369                                 s->session->master_key,p,i);
1370                 }
1371         else
1372 #endif
1373                 {
1374                 al=SSL_AD_HANDSHAKE_FAILURE;
1375                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1376                 goto f_err;
1377                 }
1378
1379         return(1);
1380 f_err:
1381         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1382 #if !defined(NO_DH) || !defined(NO_RSA)
1383 err:
1384 #endif
1385         return(-1);
1386         }
1387
1388 static int ssl3_get_cert_verify(SSL *s)
1389         {
1390         EVP_PKEY *pkey=NULL;
1391         unsigned char *p;
1392         int al,ok,ret=0;
1393         long n;
1394         int type=0,i,j;
1395         X509 *peer;
1396
1397         n=ssl3_get_message(s,
1398                 SSL3_ST_SR_CERT_VRFY_A,
1399                 SSL3_ST_SR_CERT_VRFY_B,
1400                 -1,
1401                 512, /* 512? */
1402                 &ok);
1403
1404         if (!ok) return((int)n);
1405
1406         if (s->session->peer != NULL)
1407                 {
1408                 peer=s->session->peer;
1409                 pkey=X509_get_pubkey(peer);
1410                 type=X509_certificate_type(peer,pkey);
1411                 }
1412         else
1413                 {
1414                 peer=NULL;
1415                 pkey=NULL;
1416                 }
1417
1418         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1419                 {
1420                 s->s3->tmp.reuse_message=1;
1421                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1422                         {
1423                         al=SSL_AD_UNEXPECTED_MESSAGE;
1424                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1425                         goto f_err;
1426                         }
1427                 ret=1;
1428                 goto end;
1429                 }
1430
1431         if (peer == NULL)
1432                 {
1433                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1434                 al=SSL_AD_UNEXPECTED_MESSAGE;
1435                 goto f_err;
1436                 }
1437
1438         if (!(type & EVP_PKT_SIGN))
1439                 {
1440                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1441                 al=SSL_AD_ILLEGAL_PARAMETER;
1442                 goto f_err;
1443                 }
1444
1445         if (s->s3->change_cipher_spec)
1446                 {
1447                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1448                 al=SSL_AD_UNEXPECTED_MESSAGE;
1449                 goto f_err;
1450                 }
1451
1452         /* we now have a signature that we need to verify */
1453         p=(unsigned char *)s->init_buf->data;
1454         n2s(p,i);
1455         n-=2;
1456         if (i > n)
1457                 {
1458                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1459                 al=SSL_AD_DECODE_ERROR;
1460                 goto f_err;
1461                 }
1462
1463         j=EVP_PKEY_size(pkey);
1464         if ((i > j) || (n > j) || (n <= 0))
1465                 {
1466                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1467                 al=SSL_AD_DECODE_ERROR;
1468                 goto f_err;
1469                 }
1470
1471 #ifndef NO_RSA
1472         if (pkey->type == EVP_PKEY_RSA)
1473                 {
1474                 i=RSA_public_decrypt(i,p,p,pkey->pkey.rsa,RSA_PKCS1_PADDING);
1475                 if (i < 0)
1476                         {
1477                         al=SSL_AD_DECRYPT_ERROR;
1478                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1479                         goto f_err;
1480                         }
1481                 if ((i != (MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH)) ||
1482                         memcmp(&(s->s3->tmp.finish_md[0]),p,
1483                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH))
1484                         {
1485                         al=SSL_AD_DECRYPT_ERROR;
1486                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1487                         goto f_err;
1488                         }
1489                 }
1490         else
1491 #endif
1492 #ifndef NO_DSA
1493                 if (pkey->type == EVP_PKEY_DSA)
1494                 {
1495                 j=DSA_verify(pkey->save_type,
1496                         &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]),
1497                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1498                 if (j <= 0)
1499                         {
1500                         /* bad signature */
1501                         al=SSL_AD_DECRYPT_ERROR;
1502                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1503                         goto f_err;
1504                         }
1505                 }
1506         else
1507 #endif
1508                 {
1509                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1510                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1511                 goto f_err;
1512                 }
1513
1514
1515         ret=1;
1516         if (0)
1517                 {
1518 f_err:
1519                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1520                 }
1521 end:
1522         EVP_PKEY_free(pkey);
1523         return(ret);
1524         }
1525
1526 static int ssl3_get_client_certificate(SSL *s)
1527         {
1528         int i,ok,al,ret= -1;
1529         X509 *x=NULL;
1530         unsigned long l,nc,llen,n;
1531         unsigned char *p,*d,*q;
1532         STACK_OF(X509) *sk=NULL;
1533
1534         n=ssl3_get_message(s,
1535                 SSL3_ST_SR_CERT_A,
1536                 SSL3_ST_SR_CERT_B,
1537                 -1,
1538 #if defined(MSDOS) && !defined(WIN32)
1539                 1024*30, /* 30k max cert list :-) */
1540 #else
1541                 1024*100, /* 100k max cert list :-) */
1542 #endif
1543                 &ok);
1544
1545         if (!ok) return((int)n);
1546
1547         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1548                 {
1549                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1550                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1551                         {
1552                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1553                         al=SSL_AD_HANDSHAKE_FAILURE;
1554                         goto f_err;
1555                         }
1556                 /* If tls asked for a client cert we must return a 0 list */
1557                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1558                         {
1559                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1560                         al=SSL_AD_UNEXPECTED_MESSAGE;
1561                         goto f_err;
1562                         }
1563                 s->s3->tmp.reuse_message=1;
1564                 return(1);
1565                 }
1566
1567         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1568                 {
1569                 al=SSL_AD_UNEXPECTED_MESSAGE;
1570                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1571                 goto f_err;
1572                 }
1573         d=p=(unsigned char *)s->init_buf->data;
1574
1575         if ((sk=sk_X509_new_null()) == NULL)
1576                 {
1577                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1578                 goto err;
1579                 }
1580
1581         n2l3(p,llen);
1582         if (llen+3 != n)
1583                 {
1584                 al=SSL_AD_DECODE_ERROR;
1585                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1586                 goto f_err;
1587                 }
1588         for (nc=0; nc<llen; )
1589                 {
1590                 n2l3(p,l);
1591                 if ((l+nc+3) > llen)
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
1598                 q=p;
1599                 x=d2i_X509(NULL,&p,l);
1600                 if (x == NULL)
1601                         {
1602                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1603                         goto err;
1604                         }
1605                 if (p != (q+l))
1606                         {
1607                         al=SSL_AD_DECODE_ERROR;
1608                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1609                         goto f_err;
1610                         }
1611                 if (!sk_X509_push(sk,x))
1612                         {
1613                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1614                         goto err;
1615                         }
1616                 x=NULL;
1617                 nc+=l+3;
1618                 }
1619
1620         if (sk_X509_num(sk) <= 0)
1621                 {
1622                 /* TLS does not mind 0 certs returned */
1623                 if (s->version == SSL3_VERSION)
1624                         {
1625                         al=SSL_AD_HANDSHAKE_FAILURE;
1626                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1627                         goto f_err;
1628                         }
1629                 /* Fail for TLS only if we required a certificate */
1630                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1631                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1632                         {
1633                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1634                         al=SSL_AD_HANDSHAKE_FAILURE;
1635                         goto f_err;
1636                         }
1637                 }
1638         else
1639                 {
1640                 i=ssl_verify_cert_chain(s,sk);
1641                 if (!i)
1642                         {
1643                         al=ssl_verify_alarm_type(s->verify_result);
1644                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1645                         goto f_err;
1646                         }
1647                 }
1648
1649         /* This should not be needed */
1650         if (s->session->peer != NULL)
1651                 X509_free(s->session->peer);
1652         s->session->peer=sk_X509_shift(sk);
1653         s->session->cert->cert_chain=sk;
1654         sk=NULL;
1655
1656         ret=1;
1657         if (0)
1658                 {
1659 f_err:
1660                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1661                 }
1662 err:
1663         if (x != NULL) X509_free(x);
1664         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1665         return(ret);
1666         }
1667
1668 int ssl3_send_server_certificate(SSL *s)
1669         {
1670         unsigned long l;
1671         X509 *x;
1672
1673         if (s->state == SSL3_ST_SW_CERT_A)
1674                 {
1675                 x=ssl_get_server_send_cert(s);
1676                 if (x == NULL)
1677                         {
1678                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1679                         return(0);
1680                         }
1681
1682                 l=ssl3_output_cert_chain(s,x);
1683                 s->state=SSL3_ST_SW_CERT_B;
1684                 s->init_num=(int)l;
1685                 s->init_off=0;
1686                 }
1687
1688         /* SSL3_ST_SW_CERT_B */
1689         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1690         }