ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #define REUSE_CIPHER_BUG
  60
  61 #include <stdio.h>
  62 #include <openssl/buffer.h>
  63 #include <openssl/rand.h>
  64 #include <openssl/objects.h>
  65 #include <openssl/md5.h>
  66 #include <openssl/sha.h>
  67 #include <openssl/evp.h>
  68 #include <openssl/x509.h>
  69 #include "ssl_locl.h"
  70
  71 static SSL_METHOD *ssl3_get_server_method(int ver);
  72 static int ssl3_get_client_hello(SSL *s);
  73 static int ssl3_check_client_hello(SSL *s);
  74 static int ssl3_send_server_hello(SSL *s);
  75 static int ssl3_send_server_key_exchange(SSL *s);
  76 static int ssl3_send_certificate_request(SSL *s);
  77 static int ssl3_send_server_done(SSL *s);
  78 static int ssl3_get_cert_verify(SSL *s);
  79 static int ssl3_get_client_key_exchange(SSL *s);
  80 static int ssl3_get_client_certificate(SSL *s);
  81 static int ssl3_send_hello_request(SSL *s);
  82
  83 static SSL_METHOD *ssl3_get_server_method(int ver)
  84         {
  85         if (ver == SSL3_VERSION)
  86                 return(SSLv3_server_method());
  87         else
  88                 return(NULL);
  89         }
  90
  91 SSL_METHOD *SSLv3_server_method(void)
  92         {
  93         static int init=1;
  94         static SSL_METHOD SSLv3_server_data;
  95
  96         if (init)
  97                 {
  98                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
  99                         sizeof(SSL_METHOD));
 100                 SSLv3_server_data.ssl_accept=ssl3_accept;
 101                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 102                 init=0;
 103                 }
 104         return(&SSLv3_server_data);
 105         }
 106
 107 int ssl3_accept(SSL *s)
 108         {
 109         BUF_MEM *buf;
 110         unsigned long l,Time=time(NULL);
 111         void (*cb)()=NULL;
 112         long num1;
 113         int ret= -1;
 114         int new_state,state,skip=0;
 115
 116         RAND_add(&Time,sizeof(Time),0);
 117         ERR_clear_error();
 118         clear_sys_error();
 119
 120         if (s->info_callback != NULL)
 121                 cb=s->info_callback;
 122         else if (s->ctx->info_callback != NULL)
 123                 cb=s->ctx->info_callback;
 124
 125         /* init things to blank */
 126         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 127         s->in_handshake++;
 128
 129         if (s->cert == NULL)
 130                 {
 131                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 132                 return(-1);
 133                 }
 134
 135         for (;;)
 136                 {
 137                 state=s->state;
 138
 139                 switch (s->state)
 140                         {
 141                 case SSL_ST_RENEGOTIATE:
 142                         s->new_session=1;
 143                         /* s->state=SSL_ST_ACCEPT; */
 144
 145                 case SSL3_ST_SR_MS_SGC:
 146                 case SSL_ST_BEFORE:
 147                 case SSL_ST_ACCEPT:
 148                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 149                 case SSL_ST_OK|SSL_ST_ACCEPT:
 150
 151                         s->server=1;
 152                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 153
 154                         if ((s->version>>8) != 3)
 155                                 abort();
 156                         /* s->version=SSL3_VERSION; */
 157                         s->type=SSL_ST_ACCEPT;
 158
 159                         if (s->init_buf == NULL)
 160                                 {
 161                                 if ((buf=BUF_MEM_new()) == NULL)
 162                                         {
 163                                         ret= -1;
 164                                         goto end;
 165                                         }
 166                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 167                                         {
 168                                         ret= -1;
 169                                         goto end;
 170                                         }
 171                                 s->init_buf=buf;
 172                                 }
 173
 174                         if (!ssl3_setup_buffers(s))
 175                                 {
 176                                 ret= -1;
 177                                 goto end;
 178                                 }
 179
 180                         /* Ok, we now need to push on a buffering BIO so that
 181                          * the output is sent in a way that TCP likes :-)
 182                          */
 183                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 184
 185                         s->init_num=0;
 186
 187                         if (s->state != SSL_ST_RENEGOTIATE)
 188                                 {
 189                                 if(s->state != SSL3_ST_SR_MS_SGC) ssl3_init_finished_mac(s);
 190                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 191                                 s->ctx->stats.sess_accept++;
 192                                 }
 193                         else
 194                                 {
 195                                 s->ctx->stats.sess_accept_renegotiate++;
 196                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 197                                 }
 198                         break;
 199
 200                 case SSL3_ST_SW_HELLO_REQ_A:
 201                 case SSL3_ST_SW_HELLO_REQ_B:
 202
 203                         s->shutdown=0;
 204                         ret=ssl3_send_hello_request(s);
 205                         if (ret <= 0) goto end;
 206                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 207                         s->state=SSL3_ST_SW_FLUSH;
 208                         s->init_num=0;
 209
 210                         ssl3_init_finished_mac(s);
 211                         break;
 212
 213                 case SSL3_ST_SW_HELLO_REQ_C:
 214                         s->state=SSL_ST_OK;
 215                         ret=1;
 216                         goto end;
 217                         /* break; */
 218
 219                 case SSL3_ST_SR_CLNT_HELLO_A:
 220                 case SSL3_ST_SR_CLNT_HELLO_B:
 221                 case SSL3_ST_SR_CLNT_HELLO_C:
 222
 223                         s->shutdown=0;
 224                         ret=ssl3_get_client_hello(s);
 225                         if (ret <= 0) goto end;
 226                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 227                         s->init_num=0;
 228                         break;
 229
 230                 case SSL3_ST_SW_SRVR_HELLO_A:
 231                 case SSL3_ST_SW_SRVR_HELLO_B:
 232                         ret=ssl3_send_server_hello(s);
 233                         if (ret <= 0) goto end;
 234
 235                         if (s->hit)
 236                                 s->state=SSL3_ST_SW_CHANGE_A;
 237                         else
 238                                 s->state=SSL3_ST_SW_CERT_A;
 239                         s->init_num=0;
 240                         break;
 241
 242                 case SSL3_ST_SW_CERT_A:
 243                 case SSL3_ST_SW_CERT_B:
 244                         /* Check if it is anon DH */
 245                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 246                                 {
 247                                 ret=ssl3_send_server_certificate(s);
 248                                 if (ret <= 0) goto end;
 249                                 }
 250                         else
 251                                 skip=1;
 252                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 253                         s->init_num=0;
 254                         break;
 255
 256                 case SSL3_ST_SW_KEY_EXCH_A:
 257                 case SSL3_ST_SW_KEY_EXCH_B:
 258                         l=s->s3->tmp.new_cipher->algorithms;
 259
 260                         /* clear this, it may get reset by
 261                          * send_server_key_exchange */
 262                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 263                                 s->s3->tmp.use_rsa_tmp=1;
 264                         else
 265                                 s->s3->tmp.use_rsa_tmp=0;
 266
 267                         /* only send if a DH key exchange, fortezza or
 268                          * RSA but we have a sign only certificate */
 269                         if (s->s3->tmp.use_rsa_tmp
 270                             || (l & (SSL_DH|SSL_kFZA))
 271                             || ((l & SSL_kRSA)
 272                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 273                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 274                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 275                                         )
 276                                     )
 277                                 )
 278                             )
 279                                 {
 280                                 ret=ssl3_send_server_key_exchange(s);
 281                                 if (ret <= 0) goto end;
 282                                 }
 283                         else
 284                                 skip=1;
 285
 286                         s->state=SSL3_ST_SW_CERT_REQ_A;
 287                         s->init_num=0;
 288                         break;
 289
 290                 case SSL3_ST_SW_CERT_REQ_A:
 291                 case SSL3_ST_SW_CERT_REQ_B:
 292                         if (/* don't request cert unless asked for it: */
 293                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 294                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 295                                  * don't request cert during re-negotiation: */
 296                                 ((s->session->peer != NULL) &&
 297                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 298                                 /* never request cert in anonymous ciphersuites
 299                                  * (see section "Certificate request" in SSL 3 drafts
 300                                  * and in RFC 2246): */
 301                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 302                                  /* ... except when the application insists on verification
 303                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 304                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
 305                                 {
 306                                 /* no cert request */
 307                                 skip=1;
 308                                 s->s3->tmp.cert_request=0;
 309                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 310                                 }
 311                         else
 312                                 {
 313                                 s->s3->tmp.cert_request=1;
 314                                 ret=ssl3_send_certificate_request(s);
 315                                 if (ret <= 0) goto end;
 316                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 317                                 s->init_num=0;
 318                                 }
 319                         break;
 320
 321                 case SSL3_ST_SW_SRVR_DONE_A:
 322                 case SSL3_ST_SW_SRVR_DONE_B:
 323                         ret=ssl3_send_server_done(s);
 324                         if (ret <= 0) goto end;
 325                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 326                         s->state=SSL3_ST_SW_FLUSH;
 327                         s->init_num=0;
 328                         break;
 329
 330                 case SSL3_ST_SW_FLUSH:
 331                         /* number of bytes to be flushed */
 332                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 333                         if (num1 > 0)
 334                                 {
 335                                 s->rwstate=SSL_WRITING;
 336                                 num1=BIO_flush(s->wbio);
 337                                 if (num1 <= 0) { ret= -1; goto end; }
 338                                 s->rwstate=SSL_NOTHING;
 339                                 }
 340
 341                         s->state=s->s3->tmp.next_state;
 342                         break;
 343
 344                 case SSL3_ST_SR_CERT_A:
 345                 case SSL3_ST_SR_CERT_B:
 346                         /* Check for second client hello if MS SGC */
 347                         ret = ssl3_check_client_hello(s);
 348                         if(ret <= 0) goto end;
 349                         if(ret == 2) s->state = SSL3_ST_SR_MS_SGC;
 350                         else {
 351                                 /* could be sent for a DH cert, even if we
 352                                  * have not asked for it :-) */
 353                                 ret=ssl3_get_client_certificate(s);
 354                                 if (ret <= 0) goto end;
 355                                 s->init_num=0;
 356                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 357                         }
 358                         break;
 359
 360                 case SSL3_ST_SR_KEY_EXCH_A:
 361                 case SSL3_ST_SR_KEY_EXCH_B:
 362                         ret=ssl3_get_client_key_exchange(s);
 363                         if (ret <= 0) goto end;
 364                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 365                         s->init_num=0;
 366
 367                         /* We need to get hashes here so if there is
 368                          * a client cert, it can be verified */
 369                         s->method->ssl3_enc->cert_verify_mac(s,
 370                                 &(s->s3->finish_dgst1),
 371                                 &(s->s3->tmp.cert_verify_md[0]));
 372                         s->method->ssl3_enc->cert_verify_mac(s,
 373                                 &(s->s3->finish_dgst2),
 374                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 375
 376                         break;
 377
 378                 case SSL3_ST_SR_CERT_VRFY_A:
 379                 case SSL3_ST_SR_CERT_VRFY_B:
 380
 381                         /* we should decide if we expected this one */
 382                         ret=ssl3_get_cert_verify(s);
 383                         if (ret <= 0) goto end;
 384
 385                         s->state=SSL3_ST_SR_FINISHED_A;
 386                         s->init_num=0;
 387                         break;
 388
 389                 case SSL3_ST_SR_FINISHED_A:
 390                 case SSL3_ST_SR_FINISHED_B:
 391                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 392                                 SSL3_ST_SR_FINISHED_B);
 393                         if (ret <= 0) goto end;
 394                         if (s->hit)
 395                                 s->state=SSL_ST_OK;
 396                         else
 397                                 s->state=SSL3_ST_SW_CHANGE_A;
 398                         s->init_num=0;
 399                         break;
 400
 401                 case SSL3_ST_SW_CHANGE_A:
 402                 case SSL3_ST_SW_CHANGE_B:
 403
 404                         s->session->cipher=s->s3->tmp.new_cipher;
 405                         if (!s->method->ssl3_enc->setup_key_block(s))
 406                                 { ret= -1; goto end; }
 407
 408                         ret=ssl3_send_change_cipher_spec(s,
 409                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 410
 411                         if (ret <= 0) goto end;
 412                         s->state=SSL3_ST_SW_FINISHED_A;
 413                         s->init_num=0;
 414
 415                         if (!s->method->ssl3_enc->change_cipher_state(s,
 416                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 417                                 {
 418                                 ret= -1;
 419                                 goto end;
 420                                 }
 421
 422                         break;
 423
 424                 case SSL3_ST_SW_FINISHED_A:
 425                 case SSL3_ST_SW_FINISHED_B:
 426                         ret=ssl3_send_finished(s,
 427                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 428                                 s->method->ssl3_enc->server_finished_label,
 429                                 s->method->ssl3_enc->server_finished_label_len);
 430                         if (ret <= 0) goto end;
 431                         s->state=SSL3_ST_SW_FLUSH;
 432                         if (s->hit)
 433                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 434                         else
 435                                 s->s3->tmp.next_state=SSL_ST_OK;
 436                         s->init_num=0;
 437                         break;
 438
 439                 case SSL_ST_OK:
 440                         /* clean a few things up */
 441                         ssl3_cleanup_key_block(s);
 442
 443                         BUF_MEM_free(s->init_buf);
 444                         s->init_buf=NULL;
 445
 446                         /* remove buffering on output */
 447                         ssl_free_wbio_buffer(s);
 448
 449                         s->new_session=0;
 450                         s->init_num=0;
 451
 452                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 453
 454                         s->ctx->stats.sess_accept_good++;
 455                         /* s->server=1; */
 456                         s->handshake_func=ssl3_accept;
 457                         ret=1;
 458
 459                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 460
 461                         goto end;
 462                         /* break; */
 463
 464                 default:
 465                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 466                         ret= -1;
 467                         goto end;
 468                         /* break; */
 469                         }
 470
 471                 if (!s->s3->tmp.reuse_message && !skip)
 472                         {
 473                         if (s->debug)
 474                                 {
 475                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 476                                         goto end;
 477                                 }
 478
 479
 480                         if ((cb != NULL) && (s->state != state))
 481                                 {
 482                                 new_state=s->state;
 483                                 s->state=state;
 484                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 485                                 s->state=new_state;
 486                                 }
 487                         }
 488                 skip=0;
 489                 }
 490 end:
 491         /* BIO_flush(s->wbio); */
 492
 493         if (cb != NULL)
 494                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 495         s->in_handshake--;
 496         return(ret);
 497         }
 498
 499 static int ssl3_send_hello_request(SSL *s)
 500         {
 501         unsigned char *p;
 502
 503         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 504                 {
 505                 p=(unsigned char *)s->init_buf->data;
 506                 *(p++)=SSL3_MT_HELLO_REQUEST;
 507                 *(p++)=0;
 508                 *(p++)=0;
 509                 *(p++)=0;
 510
 511                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 512                 /* number of bytes to write */
 513                 s->init_num=4;
 514                 s->init_off=0;
 515                 }
 516
 517         /* SSL3_ST_SW_HELLO_REQ_B */
 518         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 519         }
 520
 521 static int ssl3_check_client_hello(SSL *s)
 522         {
 523         int ok;
 524         long n;
 525
 526         n=ssl3_get_message(s,
 527                 SSL3_ST_SR_CERT_A,
 528                 SSL3_ST_SR_CERT_B,
 529                 -1,
 530                 SSL3_RT_MAX_PLAIN_LENGTH,
 531                 &ok);
 532         if (!ok) return((int)n);
 533         s->s3->tmp.reuse_message = 1;
 534         if(s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO) return 2;
 535         return 1;
 536 }
 537
 538 static int ssl3_get_client_hello(SSL *s)
 539         {
 540         int i,j,ok,al,ret= -1;
 541         long n;
 542         unsigned long id;
 543         unsigned char *p,*d,*q;
 544         SSL_CIPHER *c;
 545         SSL_COMP *comp=NULL;
 546         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 547
 548         /* We do this so that we will respond with our native type.
 549          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 550          * This down switching should be handled by a different method.
 551          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 552          * TLSv1.
 553          */
 554         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 555                 {
 556                 s->first_packet=1;
 557                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 558                 }
 559         n=ssl3_get_message(s,
 560                 SSL3_ST_SR_CLNT_HELLO_B,
 561                 SSL3_ST_SR_CLNT_HELLO_C,
 562                 SSL3_MT_CLIENT_HELLO,
 563                 SSL3_RT_MAX_PLAIN_LENGTH,
 564                 &ok);
 565
 566         if (!ok) return((int)n);
 567         d=p=(unsigned char *)s->init_buf->data;
 568
 569         /* use version from inside client hello, not from record header
 570          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 571         s->client_version=(((int)p[0])<<8)|(int)p[1];
 572         p+=2;
 573
 574         /* load the client random */
 575         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 576         p+=SSL3_RANDOM_SIZE;
 577
 578         /* get the session-id */
 579         j= *(p++);
 580
 581         s->hit=0;
 582         if (j == 0)
 583                 {
 584                 if (!ssl_get_new_session(s,1))
 585                         goto err;
 586                 }
 587         else
 588                 {
 589                 i=ssl_get_prev_session(s,p,j);
 590                 if (i == 1)
 591                         { /* previous session */
 592                         s->hit=1;
 593                         }
 594                 else if (i == -1)
 595                         goto err;
 596                 else /* i == 0 */
 597                         {
 598                         if (!ssl_get_new_session(s,1))
 599                                 goto err;
 600                         }
 601                 }
 602
 603         p+=j;
 604         n2s(p,i);
 605         if ((i == 0) && (j != 0))
 606                 {
 607                 /* we need a cipher if we are not resuming a session */
 608                 al=SSL_AD_ILLEGAL_PARAMETER;
 609                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 610                 goto f_err;
 611                 }
 612         if ((i+p) > (d+n))
 613                 {
 614                 /* not enough data */
 615                 al=SSL_AD_DECODE_ERROR;
 616                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 617                 goto f_err;
 618                 }
 619         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 620                 == NULL))
 621                 {
 622                 goto err;
 623                 }
 624         p+=i;
 625
 626         /* If it is a hit, check that the cipher is in the list */
 627         if ((s->hit) && (i > 0))
 628                 {
 629                 j=0;
 630                 id=s->session->cipher->id;
 631
 632 #ifdef CIPHER_DEBUG
 633                 printf("client sent %d ciphers\n",sk_num(ciphers));
 634 #endif
 635                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 636                         {
 637                         c=sk_SSL_CIPHER_value(ciphers,i);
 638 #ifdef CIPHER_DEBUG
 639                         printf("client [%2d of %2d]:%s\n",
 640                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 641 #endif
 642                         if (c->id == id)
 643                                 {
 644                                 j=1;
 645                                 break;
 646                                 }
 647                         }
 648                 if (j == 0)
 649                         {
 650                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 651                                 {
 652                                 /* Very bad for multi-threading.... */
 653                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 654                                                                        0);
 655                                 }
 656                         else
 657                                 {
 658                                 /* we need to have the cipher in the cipher
 659                                  * list if we are asked to reuse it */
 660                                 al=SSL_AD_ILLEGAL_PARAMETER;
 661                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 662                                 goto f_err;
 663                                 }
 664                         }
 665                 }
 666
 667         /* compression */
 668         i= *(p++);
 669         q=p;
 670         for (j=0; j<i; j++)
 671                 {
 672                 if (p[j] == 0) break;
 673                 }
 674
 675         p+=i;
 676         if (j >= i)
 677                 {
 678                 /* no compress */
 679                 al=SSL_AD_DECODE_ERROR;
 680                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 681                 goto f_err;
 682                 }
 683
 684         /* Worst case, we will use the NULL compression, but if we have other
 685          * options, we will now look for them.  We have i-1 compression
 686          * algorithms from the client, starting at q. */
 687         s->s3->tmp.new_compression=NULL;
 688         if (s->ctx->comp_methods != NULL)
 689                 { /* See if we have a match */
 690                 int m,nn,o,v,done=0;
 691
 692                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 693                 for (m=0; m<nn; m++)
 694                         {
 695                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 696                         v=comp->id;
 697                         for (o=0; o<i; o++)
 698                                 {
 699                                 if (v == q[o])
 700                                         {
 701                                         done=1;
 702                                         break;
 703                                         }
 704                                 }
 705                         if (done) break;
 706                         }
 707                 if (done)
 708                         s->s3->tmp.new_compression=comp;
 709                 else
 710                         comp=NULL;
 711                 }
 712
 713         /* TLS does not mind if there is extra stuff */
 714         if (s->version == SSL3_VERSION)
 715                 {
 716                 if (p > (d+n))
 717                         {
 718                         /* wrong number of bytes,
 719                          * there could be more to follow */
 720                         al=SSL_AD_DECODE_ERROR;
 721                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 722                         goto f_err;
 723                         }
 724                 }
 725
 726         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 727          * pick a cipher */
 728
 729         if (!s->hit)
 730                 {
 731                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 732                 if (s->session->ciphers != NULL)
 733                         sk_SSL_CIPHER_free(s->session->ciphers);
 734                 s->session->ciphers=ciphers;
 735                 if (ciphers == NULL)
 736                         {
 737                         al=SSL_AD_ILLEGAL_PARAMETER;
 738                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 739                         goto f_err;
 740                         }
 741                 ciphers=NULL;
 742                 c=ssl3_choose_cipher(s,s->session->ciphers,
 743                                      ssl_get_ciphers_by_id(s));
 744
 745                 if (c == NULL)
 746                         {
 747                         al=SSL_AD_HANDSHAKE_FAILURE;
 748                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 749                         goto f_err;
 750                         }
 751                 s->s3->tmp.new_cipher=c;
 752                 }
 753         else
 754                 {
 755                 /* Session-id reuse */
 756 #ifdef REUSE_CIPHER_BUG
 757                 STACK_OF(SSL_CIPHER) *sk;
 758                 SSL_CIPHER *nc=NULL;
 759                 SSL_CIPHER *ec=NULL;
 760
 761                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 762                         {
 763                         sk=s->session->ciphers;
 764                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 765                                 {
 766                                 c=sk_SSL_CIPHER_value(sk,i);
 767                                 if (c->algorithms & SSL_eNULL)
 768                                         nc=c;
 769                                 if (SSL_C_IS_EXPORT(c))
 770                                         ec=c;
 771                                 }
 772                         if (nc != NULL)
 773                                 s->s3->tmp.new_cipher=nc;
 774                         else if (ec != NULL)
 775                                 s->s3->tmp.new_cipher=ec;
 776                         else
 777                                 s->s3->tmp.new_cipher=s->session->cipher;
 778                         }
 779                 else
 780 #endif
 781                 s->s3->tmp.new_cipher=s->session->cipher;
 782                 }
 783
 784         /* we now have the following setup.
 785          * client_random
 786          * cipher_list          - our prefered list of ciphers
 787          * ciphers              - the clients prefered list of ciphers
 788          * compression          - basically ignored right now
 789          * ssl version is set   - sslv3
 790          * s->session           - The ssl session has been setup.
 791          * s->hit               - session reuse flag
 792          * s->tmp.new_cipher    - the new cipher to use.
 793          */
 794
 795         ret=1;
 796         if (0)
 797                 {
 798 f_err:
 799                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 800                 }
 801 err:
 802         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 803         return(ret);
 804         }
 805
 806 static int ssl3_send_server_hello(SSL *s)
 807         {
 808         unsigned char *buf;
 809         unsigned char *p,*d;
 810         int i,sl;
 811         unsigned long l,Time;
 812
 813         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 814                 {
 815                 buf=(unsigned char *)s->init_buf->data;
 816                 p=s->s3->server_random;
 817                 Time=time(NULL);                        /* Time */
 818                 l2n(Time,p);
 819                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 820                 /* Do the message type and length last */
 821                 d=p= &(buf[4]);
 822
 823                 *(p++)=s->version>>8;
 824                 *(p++)=s->version&0xff;
 825
 826                 /* Random stuff */
 827                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 828                 p+=SSL3_RANDOM_SIZE;
 829
 830                 /* now in theory we have 3 options to sending back the
 831                  * session id.  If it is a re-use, we send back the
 832                  * old session-id, if it is a new session, we send
 833                  * back the new session-id or we send back a 0 length
 834                  * session-id if we want it to be single use.
 835                  * Currently I will not implement the '0' length session-id
 836                  * 12-Jan-98 - I'll now support the '0' length stuff.
 837                  */
 838                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 839                         s->session->session_id_length=0;
 840
 841                 sl=s->session->session_id_length;
 842                 *(p++)=sl;
 843                 memcpy(p,s->session->session_id,sl);
 844                 p+=sl;
 845
 846                 /* put the cipher */
 847                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 848                 p+=i;
 849
 850                 /* put the compression method */
 851                 if (s->s3->tmp.new_compression == NULL)
 852                         *(p++)=0;
 853                 else
 854                         *(p++)=s->s3->tmp.new_compression->id;
 855
 856                 /* do the header */
 857                 l=(p-d);
 858                 d=buf;
 859                 *(d++)=SSL3_MT_SERVER_HELLO;
 860                 l2n3(l,d);
 861
 862                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 863                 /* number of bytes to write */
 864                 s->init_num=p-buf;
 865                 s->init_off=0;
 866                 }
 867
 868         /* SSL3_ST_CW_CLNT_HELLO_B */
 869         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 870         }
 871
 872 static int ssl3_send_server_done(SSL *s)
 873         {
 874         unsigned char *p;
 875
 876         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 877                 {
 878                 p=(unsigned char *)s->init_buf->data;
 879
 880                 /* do the header */
 881                 *(p++)=SSL3_MT_SERVER_DONE;
 882                 *(p++)=0;
 883                 *(p++)=0;
 884                 *(p++)=0;
 885
 886                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 887                 /* number of bytes to write */
 888                 s->init_num=4;
 889                 s->init_off=0;
 890                 }
 891
 892         /* SSL3_ST_CW_CLNT_HELLO_B */
 893         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 894         }
 895
 896 static int ssl3_send_server_key_exchange(SSL *s)
 897         {
 898 #ifndef NO_RSA
 899         unsigned char *q;
 900         int j,num;
 901         RSA *rsa;
 902         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 903         unsigned int u;
 904 #endif
 905 #ifndef NO_DH
 906         DH *dh=NULL,*dhp;
 907 #endif
 908         EVP_PKEY *pkey;
 909         unsigned char *p,*d;
 910         int al,i;
 911         unsigned long type;
 912         int n;
 913         CERT *cert;
 914         BIGNUM *r[4];
 915         int nr[4],kn;
 916         BUF_MEM *buf;
 917         EVP_MD_CTX md_ctx;
 918
 919         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 920                 {
 921                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 922                 cert=s->cert;
 923
 924                 buf=s->init_buf;
 925
 926                 r[0]=r[1]=r[2]=r[3]=NULL;
 927                 n=0;
 928 #ifndef NO_RSA
 929                 if (type & SSL_kRSA)
 930                         {
 931                         rsa=cert->rsa_tmp;
 932                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 933                                 {
 934                                 rsa=s->cert->rsa_tmp_cb(s,
 935                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 936                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 937                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 938                                 cert->rsa_tmp=rsa;
 939                                 }
 940                         if (rsa == NULL)
 941                                 {
 942                                 al=SSL_AD_HANDSHAKE_FAILURE;
 943                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 944                                 goto f_err;
 945                                 }
 946                         r[0]=rsa->n;
 947                         r[1]=rsa->e;
 948                         s->s3->tmp.use_rsa_tmp=1;
 949                         }
 950                 else
 951 #endif
 952 #ifndef NO_DH
 953                         if (type & SSL_kEDH)
 954                         {
 955                         dhp=cert->dh_tmp;
 956                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 957                                 dhp=s->cert->dh_tmp_cb(s,
 958                                       !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 959                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 960                         if (dhp == NULL)
 961                                 {
 962                                 al=SSL_AD_HANDSHAKE_FAILURE;
 963                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 964                                 goto f_err;
 965                                 }
 966
 967                         if (s->s3->tmp.dh != NULL)
 968                                 {
 969                                 DH_free(dh);
 970                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, SSL_R_INTERNAL_ERROR);
 971                                 goto err;
 972                                 }
 973
 974                         if ((dh=DHparams_dup(dhp)) == NULL)
 975                                 {
 976                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 977                                 goto err;
 978                                 }
 979
 980                         s->s3->tmp.dh=dh;
 981                         if ((dhp->pub_key == NULL ||
 982                              dhp->priv_key == NULL ||
 983                              (s->options & SSL_OP_SINGLE_DH_USE)))
 984                                 {
 985                                 if(!DH_generate_key(dh))
 986                                     {
 987                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
 988                                            ERR_R_DH_LIB);
 989                                     goto err;
 990                                     }
 991                                 }
 992                         else
 993                                 {
 994                                 dh->pub_key=BN_dup(dhp->pub_key);
 995                                 dh->priv_key=BN_dup(dhp->priv_key);
 996                                 if ((dh->pub_key == NULL) ||
 997                                         (dh->priv_key == NULL))
 998                                         {
 999                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1000                                         goto err;
1001                                         }
1002                                 }
1003                         r[0]=dh->p;
1004                         r[1]=dh->g;
1005                         r[2]=dh->pub_key;
1006                         }
1007                 else
1008 #endif
1009                         {
1010                         al=SSL_AD_HANDSHAKE_FAILURE;
1011                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1012                         goto f_err;
1013                         }
1014                 for (i=0; r[i] != NULL; i++)
1015                         {
1016                         nr[i]=BN_num_bytes(r[i]);
1017                         n+=2+nr[i];
1018                         }
1019
1020                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1021                         {
1022                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1023                                 == NULL)
1024                                 {
1025                                 al=SSL_AD_DECODE_ERROR;
1026                                 goto f_err;
1027                                 }
1028                         kn=EVP_PKEY_size(pkey);
1029                         }
1030                 else
1031                         {
1032                         pkey=NULL;
1033                         kn=0;
1034                         }
1035
1036                 if (!BUF_MEM_grow(buf,n+4+kn))
1037                         {
1038                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1039                         goto err;
1040                         }
1041                 d=(unsigned char *)s->init_buf->data;
1042                 p= &(d[4]);
1043
1044                 for (i=0; r[i] != NULL; i++)
1045                         {
1046                         s2n(nr[i],p);
1047                         BN_bn2bin(r[i],p);
1048                         p+=nr[i];
1049                         }
1050
1051                 /* not anonymous */
1052                 if (pkey != NULL)
1053                         {
1054                         /* n is the length of the params, they start at &(d[4])
1055                          * and p points to the space at the end. */
1056 #ifndef NO_RSA
1057                         if (pkey->type == EVP_PKEY_RSA)
1058                                 {
1059                                 q=md_buf;
1060                                 j=0;
1061                                 for (num=2; num > 0; num--)
1062                                         {
1063                                         EVP_DigestInit(&md_ctx,(num == 2)
1064                                                 ?s->ctx->md5:s->ctx->sha1);
1065                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1066                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1067                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1068                                         EVP_DigestFinal(&md_ctx,q,
1069                                                 (unsigned int *)&i);
1070                                         q+=i;
1071                                         j+=i;
1072                                         }
1073                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1074                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1075                                         {
1076                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1077                                         goto err;
1078                                         }
1079                                 s2n(u,p);
1080                                 n+=u+2;
1081                                 }
1082                         else
1083 #endif
1084 #if !defined(NO_DSA)
1085                                 if (pkey->type == EVP_PKEY_DSA)
1086                                 {
1087                                 /* lets do DSS */
1088                                 EVP_SignInit(&md_ctx,EVP_dss1());
1089                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1090                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1091                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1092                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1093                                         (unsigned int *)&i,pkey))
1094                                         {
1095                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1096                                         goto err;
1097                                         }
1098                                 s2n(i,p);
1099                                 n+=i+2;
1100                                 }
1101                         else
1102 #endif
1103                                 {
1104                                 /* Is this error check actually needed? */
1105                                 al=SSL_AD_HANDSHAKE_FAILURE;
1106                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1107                                 goto f_err;
1108                                 }
1109                         }
1110
1111                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1112                 l2n3(n,d);
1113
1114                 /* we should now have things packed up, so lets send
1115                  * it off */
1116                 s->init_num=n+4;
1117                 s->init_off=0;
1118                 }
1119
1120         s->state = SSL3_ST_SW_KEY_EXCH_B;
1121         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1122 f_err:
1123         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1124 err:
1125         return(-1);
1126         }
1127
1128 static int ssl3_send_certificate_request(SSL *s)
1129         {
1130         unsigned char *p,*d;
1131         int i,j,nl,off,n;
1132         STACK_OF(X509_NAME) *sk=NULL;
1133         X509_NAME *name;
1134         BUF_MEM *buf;
1135
1136         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1137                 {
1138                 buf=s->init_buf;
1139
1140                 d=p=(unsigned char *)&(buf->data[4]);
1141
1142                 /* get the list of acceptable cert types */
1143                 p++;
1144                 n=ssl3_get_req_cert_type(s,p);
1145                 d[0]=n;
1146                 p+=n;
1147                 n++;
1148
1149                 off=n;
1150                 p+=2;
1151                 n+=2;
1152
1153                 sk=SSL_get_client_CA_list(s);
1154                 nl=0;
1155                 if (sk != NULL)
1156                         {
1157                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1158                                 {
1159                                 name=sk_X509_NAME_value(sk,i);
1160                                 j=i2d_X509_NAME(name,NULL);
1161                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1162                                         {
1163                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1164                                         goto err;
1165                                         }
1166                                 p=(unsigned char *)&(buf->data[4+n]);
1167                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1168                                         {
1169                                         s2n(j,p);
1170                                         i2d_X509_NAME(name,&p);
1171                                         n+=2+j;
1172                                         nl+=2+j;
1173                                         }
1174                                 else
1175                                         {
1176                                         d=p;
1177                                         i2d_X509_NAME(name,&p);
1178                                         j-=2; s2n(j,d); j+=2;
1179                                         n+=j;
1180                                         nl+=j;
1181                                         }
1182                                 }
1183                         }
1184                 /* else no CA names */
1185                 p=(unsigned char *)&(buf->data[4+off]);
1186                 s2n(nl,p);
1187
1188                 d=(unsigned char *)buf->data;
1189                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1190                 l2n3(n,d);
1191
1192                 /* we should now have things packed up, so lets send
1193                  * it off */
1194
1195                 s->init_num=n+4;
1196                 s->init_off=0;
1197                 }
1198
1199         /* SSL3_ST_SW_CERT_REQ_B */
1200         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1201 err:
1202         return(-1);
1203         }
1204
1205 static int ssl3_get_client_key_exchange(SSL *s)
1206         {
1207         int i,al,ok;
1208         long n;
1209         unsigned long l;
1210         unsigned char *p;
1211 #ifndef NO_RSA
1212         RSA *rsa=NULL;
1213         EVP_PKEY *pkey=NULL;
1214 #endif
1215 #ifndef NO_DH
1216         BIGNUM *pub=NULL;
1217         DH *dh_srvr;
1218 #endif
1219
1220         n=ssl3_get_message(s,
1221                 SSL3_ST_SR_KEY_EXCH_A,
1222                 SSL3_ST_SR_KEY_EXCH_B,
1223                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1224                 400, /* ???? */
1225                 &ok);
1226
1227         if (!ok) return((int)n);
1228         p=(unsigned char *)s->init_buf->data;
1229
1230         l=s->s3->tmp.new_cipher->algorithms;
1231
1232 #ifndef NO_RSA
1233         if (l & SSL_kRSA)
1234                 {
1235                 /* FIX THIS UP EAY EAY EAY EAY */
1236                 if (s->s3->tmp.use_rsa_tmp)
1237                         {
1238                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1239                                 rsa=s->cert->rsa_tmp;
1240                         /* Don't do a callback because rsa_tmp should
1241                          * be sent already */
1242                         if (rsa == NULL)
1243                                 {
1244                                 al=SSL_AD_HANDSHAKE_FAILURE;
1245                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1246                                 goto f_err;
1247
1248                                 }
1249                         }
1250                 else
1251                         {
1252                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1253                         if (    (pkey == NULL) ||
1254                                 (pkey->type != EVP_PKEY_RSA) ||
1255                                 (pkey->pkey.rsa == NULL))
1256                                 {
1257                                 al=SSL_AD_HANDSHAKE_FAILURE;
1258                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1259                                 goto f_err;
1260                                 }
1261                         rsa=pkey->pkey.rsa;
1262                         }
1263
1264                 /* TLS */
1265                 if (s->version > SSL3_VERSION)
1266                         {
1267                         n2s(p,i);
1268                         if (n != i+2)
1269                                 {
1270                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1271                                         {
1272                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1273                                         goto err;
1274                                         }
1275                                 else
1276                                         p-=2;
1277                                 }
1278                         else
1279                                 n=i;
1280                         }
1281
1282                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1283
1284 #if 0
1285                 /* If a bad decrypt, use a random master key */
1286                 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1287                         ((p[0] != (s->client_version>>8)) ||
1288                          (p[1] != (s->client_version & 0xff))))
1289                         {
1290                         int bad=1;
1291
1292                         if ((i == SSL_MAX_MASTER_KEY_LENGTH) &&
1293                                 (p[0] == (s->version>>8)) &&
1294                                 (p[1] == 0))
1295                                 {
1296                                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
1297                                         bad=0;
1298                                 }
1299                         if (bad)
1300                                 {
1301                                 p[0]=(s->version>>8);
1302                                 p[1]=(s->version & 0xff);
1303                                 RAND_pseudo_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1304                                 i=SSL_MAX_MASTER_KEY_LENGTH;
1305                                 }
1306                         /* else, an SSLeay bug, ssl only server, tls client */
1307                         }
1308 #else
1309                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1310                         {
1311                         al=SSL_AD_DECODE_ERROR;
1312                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1313                         goto f_err;
1314                         }
1315
1316                 if ((p[0] != (s->client_version>>8)) || (p[1] != (s->client_version & 0xff)))
1317                         {
1318                         al=SSL_AD_DECODE_ERROR;
1319                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1320                         goto f_err;
1321                         }
1322 #endif
1323
1324                 s->session->master_key_length=
1325                         s->method->ssl3_enc->generate_master_secret(s,
1326                                 s->session->master_key,
1327                                 p,i);
1328                 memset(p,0,i);
1329                 }
1330         else
1331 #endif
1332 #ifndef NO_DH
1333                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1334                 {
1335                 n2s(p,i);
1336                 if (n != i+2)
1337                         {
1338                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1339                                 {
1340                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1341                                 goto err;
1342                                 }
1343                         else
1344                                 {
1345                                 p-=2;
1346                                 i=(int)n;
1347                                 }
1348                         }
1349
1350                 if (n == 0L) /* the parameters are in the cert */
1351                         {
1352                         al=SSL_AD_HANDSHAKE_FAILURE;
1353                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1354                         goto f_err;
1355                         }
1356                 else
1357                         {
1358                         if (s->s3->tmp.dh == NULL)
1359                                 {
1360                                 al=SSL_AD_HANDSHAKE_FAILURE;
1361                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1362                                 goto f_err;
1363                                 }
1364                         else
1365                                 dh_srvr=s->s3->tmp.dh;
1366                         }
1367
1368                 pub=BN_bin2bn(p,i,NULL);
1369                 if (pub == NULL)
1370                         {
1371                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1372                         goto err;
1373                         }
1374
1375                 i=DH_compute_key(p,pub,dh_srvr);
1376
1377                 if (i <= 0)
1378                         {
1379                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1380                         goto err;
1381                         }
1382
1383                 DH_free(s->s3->tmp.dh);
1384                 s->s3->tmp.dh=NULL;
1385
1386                 BN_clear_free(pub);
1387                 pub=NULL;
1388                 s->session->master_key_length=
1389                         s->method->ssl3_enc->generate_master_secret(s,
1390                                 s->session->master_key,p,i);
1391                 }
1392         else
1393 #endif
1394                 {
1395                 al=SSL_AD_HANDSHAKE_FAILURE;
1396                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1397                 goto f_err;
1398                 }
1399
1400         return(1);
1401 f_err:
1402         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1403 #if !defined(NO_DH) || !defined(NO_RSA)
1404 err:
1405 #endif
1406         return(-1);
1407         }
1408
1409 static int ssl3_get_cert_verify(SSL *s)
1410         {
1411         EVP_PKEY *pkey=NULL;
1412         unsigned char *p;
1413         int al,ok,ret=0;
1414         long n;
1415         int type=0,i,j;
1416         X509 *peer;
1417
1418         n=ssl3_get_message(s,
1419                 SSL3_ST_SR_CERT_VRFY_A,
1420                 SSL3_ST_SR_CERT_VRFY_B,
1421                 -1,
1422                 512, /* 512? */
1423                 &ok);
1424
1425         if (!ok) return((int)n);
1426
1427         if (s->session->peer != NULL)
1428                 {
1429                 peer=s->session->peer;
1430                 pkey=X509_get_pubkey(peer);
1431                 type=X509_certificate_type(peer,pkey);
1432                 }
1433         else
1434                 {
1435                 peer=NULL;
1436                 pkey=NULL;
1437                 }
1438
1439         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1440                 {
1441                 s->s3->tmp.reuse_message=1;
1442                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1443                         {
1444                         al=SSL_AD_UNEXPECTED_MESSAGE;
1445                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1446                         goto f_err;
1447                         }
1448                 ret=1;
1449                 goto end;
1450                 }
1451
1452         if (peer == NULL)
1453                 {
1454                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1455                 al=SSL_AD_UNEXPECTED_MESSAGE;
1456                 goto f_err;
1457                 }
1458
1459         if (!(type & EVP_PKT_SIGN))
1460                 {
1461                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1462                 al=SSL_AD_ILLEGAL_PARAMETER;
1463                 goto f_err;
1464                 }
1465
1466         if (s->s3->change_cipher_spec)
1467                 {
1468                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1469                 al=SSL_AD_UNEXPECTED_MESSAGE;
1470                 goto f_err;
1471                 }
1472
1473         /* we now have a signature that we need to verify */
1474         p=(unsigned char *)s->init_buf->data;
1475         n2s(p,i);
1476         n-=2;
1477         if (i > n)
1478                 {
1479                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1480                 al=SSL_AD_DECODE_ERROR;
1481                 goto f_err;
1482                 }
1483
1484         j=EVP_PKEY_size(pkey);
1485         if ((i > j) || (n > j) || (n <= 0))
1486                 {
1487                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1488                 al=SSL_AD_DECODE_ERROR;
1489                 goto f_err;
1490                 }
1491
1492 #ifndef NO_RSA
1493         if (pkey->type == EVP_PKEY_RSA)
1494                 {
1495                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1496                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1497                                                         pkey->pkey.rsa);
1498                 if (i < 0)
1499                         {
1500                         al=SSL_AD_DECRYPT_ERROR;
1501                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1502                         goto f_err;
1503                         }
1504                 if (i == 0)
1505                         {
1506                         al=SSL_AD_DECRYPT_ERROR;
1507                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1508                         goto f_err;
1509                         }
1510                 }
1511         else
1512 #endif
1513 #ifndef NO_DSA
1514                 if (pkey->type == EVP_PKEY_DSA)
1515                 {
1516                 j=DSA_verify(pkey->save_type,
1517                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1518                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1519                 if (j <= 0)
1520                         {
1521                         /* bad signature */
1522                         al=SSL_AD_DECRYPT_ERROR;
1523                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1524                         goto f_err;
1525                         }
1526                 }
1527         else
1528 #endif
1529                 {
1530                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1531                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1532                 goto f_err;
1533                 }
1534
1535
1536         ret=1;
1537         if (0)
1538                 {
1539 f_err:
1540                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1541                 }
1542 end:
1543         EVP_PKEY_free(pkey);
1544         return(ret);
1545         }
1546
1547 static int ssl3_get_client_certificate(SSL *s)
1548         {
1549         int i,ok,al,ret= -1;
1550         X509 *x=NULL;
1551         unsigned long l,nc,llen,n;
1552         unsigned char *p,*d,*q;
1553         STACK_OF(X509) *sk=NULL;
1554
1555         n=ssl3_get_message(s,
1556                 SSL3_ST_SR_CERT_A,
1557                 SSL3_ST_SR_CERT_B,
1558                 -1,
1559 #if defined(MSDOS) && !defined(WIN32)
1560                 1024*30, /* 30k max cert list :-) */
1561 #else
1562                 1024*100, /* 100k max cert list :-) */
1563 #endif
1564                 &ok);
1565
1566         if (!ok) return((int)n);
1567
1568         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1569                 {
1570                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1571                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1572                         {
1573                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1574                         al=SSL_AD_HANDSHAKE_FAILURE;
1575                         goto f_err;
1576                         }
1577                 /* If tls asked for a client cert, the client must return a 0 list */
1578                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1579                         {
1580                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1581                         al=SSL_AD_UNEXPECTED_MESSAGE;
1582                         goto f_err;
1583                         }
1584                 s->s3->tmp.reuse_message=1;
1585                 return(1);
1586                 }
1587
1588         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1589                 {
1590                 al=SSL_AD_UNEXPECTED_MESSAGE;
1591                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1592                 goto f_err;
1593                 }
1594         d=p=(unsigned char *)s->init_buf->data;
1595
1596         if ((sk=sk_X509_new_null()) == NULL)
1597                 {
1598                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1599                 goto err;
1600                 }
1601
1602         n2l3(p,llen);
1603         if (llen+3 != n)
1604                 {
1605                 al=SSL_AD_DECODE_ERROR;
1606                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1607                 goto f_err;
1608                 }
1609         for (nc=0; nc<llen; )
1610                 {
1611                 n2l3(p,l);
1612                 if ((l+nc+3) > llen)
1613                         {
1614                         al=SSL_AD_DECODE_ERROR;
1615                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1616                         goto f_err;
1617                         }
1618
1619                 q=p;
1620                 x=d2i_X509(NULL,&p,l);
1621                 if (x == NULL)
1622                         {
1623                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1624                         goto err;
1625                         }
1626                 if (p != (q+l))
1627                         {
1628                         al=SSL_AD_DECODE_ERROR;
1629                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1630                         goto f_err;
1631                         }
1632                 if (!sk_X509_push(sk,x))
1633                         {
1634                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1635                         goto err;
1636                         }
1637                 x=NULL;
1638                 nc+=l+3;
1639                 }
1640
1641         if (sk_X509_num(sk) <= 0)
1642                 {
1643                 /* TLS does not mind 0 certs returned */
1644                 if (s->version == SSL3_VERSION)
1645                         {
1646                         al=SSL_AD_HANDSHAKE_FAILURE;
1647                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1648                         goto f_err;
1649                         }
1650                 /* Fail for TLS only if we required a certificate */
1651                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1652                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1653                         {
1654                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1655                         al=SSL_AD_HANDSHAKE_FAILURE;
1656                         goto f_err;
1657                         }
1658                 }
1659         else
1660                 {
1661                 i=ssl_verify_cert_chain(s,sk);
1662                 if (!i)
1663                         {
1664                         al=ssl_verify_alarm_type(s->verify_result);
1665                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1666                         goto f_err;
1667                         }
1668                 }
1669
1670         if (s->session->peer != NULL) /* This should not be needed */
1671                 X509_free(s->session->peer);
1672         s->session->peer=sk_X509_shift(sk);
1673         s->session->verify_result = s->verify_result;
1674
1675         /* With the current implementation, sess_cert will always be NULL
1676          * when we arrive here. */
1677         if (s->session->sess_cert == NULL)
1678                 {
1679                 s->session->sess_cert = ssl_sess_cert_new();
1680                 if (s->session->sess_cert == NULL)
1681                         {
1682                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1683                         goto err;
1684                         }
1685                 }
1686         if (s->session->sess_cert->cert_chain != NULL)
1687                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1688         s->session->sess_cert->cert_chain=sk;
1689
1690         sk=NULL;
1691
1692         ret=1;
1693         if (0)
1694                 {
1695 f_err:
1696                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1697                 }
1698 err:
1699         if (x != NULL) X509_free(x);
1700         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1701         return(ret);
1702         }
1703
1704 int ssl3_send_server_certificate(SSL *s)
1705         {
1706         unsigned long l;
1707         X509 *x;
1708
1709         if (s->state == SSL3_ST_SW_CERT_A)
1710                 {
1711                 x=ssl_get_server_send_cert(s);
1712                 if (x == NULL)
1713                         {
1714                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1715                         return(0);
1716                         }
1717
1718                 l=ssl3_output_cert_chain(s,x);
1719                 s->state=SSL3_ST_SW_CERT_B;
1720                 s->init_num=(int)l;
1721                 s->init_off=0;
1722                 }
1723
1724         /* SSL3_ST_SW_CERT_B */
1725         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1726         }