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 #define NETSCAPE_HANG_BUG
  61
  62
  63 #include <stdio.h>
  64 #include <openssl/buffer.h>
  65 #include <openssl/rand.h>
  66 #include <openssl/objects.h>
  67 #include <openssl/md5.h>
  68 #include <openssl/sha.h>
  69 #include <openssl/evp.h>
  70 #include <openssl/x509.h>
  71 #include "ssl_locl.h"
  72
  73 static SSL_METHOD *ssl3_get_server_method(int ver);
  74 static int ssl3_get_client_hello(SSL *s);
  75 static int ssl3_check_client_hello(SSL *s);
  76 static int ssl3_send_server_hello(SSL *s);
  77 static int ssl3_send_server_key_exchange(SSL *s);
  78 static int ssl3_send_certificate_request(SSL *s);
  79 static int ssl3_send_server_done(SSL *s);
  80 static int ssl3_get_client_key_exchange(SSL *s);
  81 static int ssl3_get_client_certificate(SSL *s);
  82 static int ssl3_get_cert_verify(SSL *s);
  83 static int ssl3_send_hello_request(SSL *s);
  84
  85 static SSL_METHOD *ssl3_get_server_method(int ver)
  86         {
  87         if (ver == SSL3_VERSION)
  88                 return(SSLv3_server_method());
  89         else
  90                 return(NULL);
  91         }
  92
  93 SSL_METHOD *SSLv3_server_method(void)
  94         {
  95         static int init=1;
  96         static SSL_METHOD SSLv3_server_data;
  97
  98         if (init)
  99                 {
 100                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 101                         sizeof(SSL_METHOD));
 102                 SSLv3_server_data.ssl_accept=ssl3_accept;
 103                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 104                 init=0;
 105                 }
 106         return(&SSLv3_server_data);
 107         }
 108
 109 int ssl3_accept(SSL *s)
 110         {
 111         BUF_MEM *buf;
 112         unsigned long l,Time=time(NULL);
 113         void (*cb)()=NULL;
 114         long num1;
 115         int ret= -1;
 116         int new_state,state,skip=0;
 117
 118         RAND_add(&Time,sizeof(Time),0);
 119         ERR_clear_error();
 120         clear_sys_error();
 121
 122         if (s->info_callback != NULL)
 123                 cb=s->info_callback;
 124         else if (s->ctx->info_callback != NULL)
 125                 cb=s->ctx->info_callback;
 126
 127         /* init things to blank */
 128         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 129         s->in_handshake++;
 130
 131         if (s->cert == NULL)
 132                 {
 133                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 134                 return(-1);
 135                 }
 136
 137         for (;;)
 138                 {
 139                 state=s->state;
 140
 141                 switch (s->state)
 142                         {
 143                 case SSL_ST_RENEGOTIATE:
 144                         s->new_session=1;
 145                         /* s->state=SSL_ST_ACCEPT; */
 146
 147                 case SSL_ST_BEFORE:
 148                 case SSL_ST_ACCEPT:
 149                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 150                 case SSL_ST_OK|SSL_ST_ACCEPT:
 151
 152                         s->server=1;
 153                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 154
 155                         if ((s->version>>8) != 3)
 156                                 {
 157                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_INTERNAL_ERROR);
 158                                 return -1;
 159                                 }
 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                                 ssl3_init_finished_mac(s);
 193                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 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
 263                         /* clear this, it may get reset by
 264                          * send_server_key_exchange */
 265                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 266                                 s->s3->tmp.use_rsa_tmp=1;
 267                         else
 268                                 s->s3->tmp.use_rsa_tmp=0;
 269
 270                         /* only send if a DH key exchange, fortezza or
 271                          * RSA but we have a sign only certificate */
 272                         if (s->s3->tmp.use_rsa_tmp
 273                             || (l & (SSL_DH|SSL_kFZA))
 274                             || ((l & SSL_kRSA)
 275                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 276                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 277                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 278                                         )
 279                                     )
 280                                 )
 281                             )
 282                                 {
 283                                 ret=ssl3_send_server_key_exchange(s);
 284                                 if (ret <= 0) goto end;
 285                                 }
 286                         else
 287                                 skip=1;
 288
 289                         s->state=SSL3_ST_SW_CERT_REQ_A;
 290                         s->init_num=0;
 291                         break;
 292
 293                 case SSL3_ST_SW_CERT_REQ_A:
 294                 case SSL3_ST_SW_CERT_REQ_B:
 295                         if (/* don't request cert unless asked for it: */
 296                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 297                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 298                                  * don't request cert during re-negotiation: */
 299                                 ((s->session->peer != NULL) &&
 300                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 301                                 /* never request cert in anonymous ciphersuites
 302                                  * (see section "Certificate request" in SSL 3 drafts
 303                                  * and in RFC 2246): */
 304                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 305                                  /* ... except when the application insists on verification
 306                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 307                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
 308                                 {
 309                                 /* no cert request */
 310                                 skip=1;
 311                                 s->s3->tmp.cert_request=0;
 312                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 313                                 }
 314                         else
 315                                 {
 316                                 s->s3->tmp.cert_request=1;
 317                                 ret=ssl3_send_certificate_request(s);
 318                                 if (ret <= 0) goto end;
 319 #ifndef NETSCAPE_HANG_BUG
 320                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 321 #else
 322                                 s->state=SSL3_ST_SW_FLUSH;
 323                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 324 #endif
 325                                 s->init_num=0;
 326                                 }
 327                         break;
 328
 329                 case SSL3_ST_SW_SRVR_DONE_A:
 330                 case SSL3_ST_SW_SRVR_DONE_B:
 331                         ret=ssl3_send_server_done(s);
 332                         if (ret <= 0) goto end;
 333                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 334                         s->state=SSL3_ST_SW_FLUSH;
 335                         s->init_num=0;
 336                         break;
 337
 338                 case SSL3_ST_SW_FLUSH:
 339                         /* number of bytes to be flushed */
 340                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 341                         if (num1 > 0)
 342                                 {
 343                                 s->rwstate=SSL_WRITING;
 344                                 num1=BIO_flush(s->wbio);
 345                                 if (num1 <= 0) { ret= -1; goto end; }
 346                                 s->rwstate=SSL_NOTHING;
 347                                 }
 348
 349                         s->state=s->s3->tmp.next_state;
 350                         break;
 351
 352                 case SSL3_ST_SR_CERT_A:
 353                 case SSL3_ST_SR_CERT_B:
 354                         /* Check for second client hello (MS SGC) */
 355                         ret = ssl3_check_client_hello(s);
 356                         if (ret <= 0)
 357                                 goto end;
 358                         if (ret == 2)
 359                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 360                         else {
 361                                 /* could be sent for a DH cert, even if we
 362                                  * have not asked for it :-) */
 363                                 ret=ssl3_get_client_certificate(s);
 364                                 if (ret <= 0) goto end;
 365                                 s->init_num=0;
 366                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 367                         }
 368                         break;
 369
 370                 case SSL3_ST_SR_KEY_EXCH_A:
 371                 case SSL3_ST_SR_KEY_EXCH_B:
 372                         ret=ssl3_get_client_key_exchange(s);
 373                         if (ret <= 0) goto end;
 374                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 375                         s->init_num=0;
 376
 377                         /* We need to get hashes here so if there is
 378                          * a client cert, it can be verified */
 379                         s->method->ssl3_enc->cert_verify_mac(s,
 380                                 &(s->s3->finish_dgst1),
 381                                 &(s->s3->tmp.cert_verify_md[0]));
 382                         s->method->ssl3_enc->cert_verify_mac(s,
 383                                 &(s->s3->finish_dgst2),
 384                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 385
 386                         break;
 387
 388                 case SSL3_ST_SR_CERT_VRFY_A:
 389                 case SSL3_ST_SR_CERT_VRFY_B:
 390
 391                         /* we should decide if we expected this one */
 392                         ret=ssl3_get_cert_verify(s);
 393                         if (ret <= 0) goto end;
 394
 395                         s->state=SSL3_ST_SR_FINISHED_A;
 396                         s->init_num=0;
 397                         break;
 398
 399                 case SSL3_ST_SR_FINISHED_A:
 400                 case SSL3_ST_SR_FINISHED_B:
 401                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 402                                 SSL3_ST_SR_FINISHED_B);
 403                         if (ret <= 0) goto end;
 404                         if (s->hit)
 405                                 s->state=SSL_ST_OK;
 406                         else
 407                                 s->state=SSL3_ST_SW_CHANGE_A;
 408                         s->init_num=0;
 409                         break;
 410
 411                 case SSL3_ST_SW_CHANGE_A:
 412                 case SSL3_ST_SW_CHANGE_B:
 413
 414                         s->session->cipher=s->s3->tmp.new_cipher;
 415                         if (!s->method->ssl3_enc->setup_key_block(s))
 416                                 { ret= -1; goto end; }
 417
 418                         ret=ssl3_send_change_cipher_spec(s,
 419                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 420
 421                         if (ret <= 0) goto end;
 422                         s->state=SSL3_ST_SW_FINISHED_A;
 423                         s->init_num=0;
 424
 425                         if (!s->method->ssl3_enc->change_cipher_state(s,
 426                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 427                                 {
 428                                 ret= -1;
 429                                 goto end;
 430                                 }
 431
 432                         break;
 433
 434                 case SSL3_ST_SW_FINISHED_A:
 435                 case SSL3_ST_SW_FINISHED_B:
 436                         ret=ssl3_send_finished(s,
 437                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 438                                 s->method->ssl3_enc->server_finished_label,
 439                                 s->method->ssl3_enc->server_finished_label_len);
 440                         if (ret <= 0) goto end;
 441                         s->state=SSL3_ST_SW_FLUSH;
 442                         if (s->hit)
 443                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 444                         else
 445                                 s->s3->tmp.next_state=SSL_ST_OK;
 446                         s->init_num=0;
 447                         break;
 448
 449                 case SSL_ST_OK:
 450                         /* clean a few things up */
 451                         ssl3_cleanup_key_block(s);
 452
 453                         BUF_MEM_free(s->init_buf);
 454                         s->init_buf=NULL;
 455
 456                         /* remove buffering on output */
 457                         ssl_free_wbio_buffer(s);
 458
 459                         s->new_session=0;
 460                         s->init_num=0;
 461
 462                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 463
 464                         s->ctx->stats.sess_accept_good++;
 465                         /* s->server=1; */
 466                         s->handshake_func=ssl3_accept;
 467                         ret=1;
 468
 469                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 470
 471                         goto end;
 472                         /* break; */
 473
 474                 default:
 475                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 476                         ret= -1;
 477                         goto end;
 478                         /* break; */
 479                         }
 480
 481                 if (!s->s3->tmp.reuse_message && !skip)
 482                         {
 483                         if (s->debug)
 484                                 {
 485                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 486                                         goto end;
 487                                 }
 488
 489
 490                         if ((cb != NULL) && (s->state != state))
 491                                 {
 492                                 new_state=s->state;
 493                                 s->state=state;
 494                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 495                                 s->state=new_state;
 496                                 }
 497                         }
 498                 skip=0;
 499                 }
 500 end:
 501         /* BIO_flush(s->wbio); */
 502
 503         if (cb != NULL)
 504                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 505         s->in_handshake--;
 506         return(ret);
 507         }
 508
 509 static int ssl3_send_hello_request(SSL *s)
 510         {
 511         unsigned char *p;
 512
 513         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 514                 {
 515                 p=(unsigned char *)s->init_buf->data;
 516                 *(p++)=SSL3_MT_HELLO_REQUEST;
 517                 *(p++)=0;
 518                 *(p++)=0;
 519                 *(p++)=0;
 520
 521                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 522                 /* number of bytes to write */
 523                 s->init_num=4;
 524                 s->init_off=0;
 525                 }
 526
 527         /* SSL3_ST_SW_HELLO_REQ_B */
 528         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 529         }
 530
 531 static int ssl3_check_client_hello(SSL *s)
 532         {
 533         int ok;
 534         long n;
 535
 536         n=ssl3_get_message(s,
 537                 SSL3_ST_SR_CERT_A,
 538                 SSL3_ST_SR_CERT_B,
 539                 -1,
 540                 SSL3_RT_MAX_PLAIN_LENGTH,
 541                 &ok);
 542         if (!ok) return((int)n);
 543         s->s3->tmp.reuse_message = 1;
 544         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 545                 {
 546                 /* Throw away what we have done so far in the current handshake,
 547                  * which will now be aborted. (A full SSL_clear would be too much.)
 548                  * I hope that tmp.dh is the only thing that may need to be cleared
 549                  * when a handshake is not completed ... */
 550 #ifndef NO_DH
 551                 if (s->s3->tmp.dh != NULL)
 552                         {
 553                         DH_free(s->s3->tmp.dh);
 554                         s->s3->tmp.dh = NULL;
 555                         }
 556 #endif
 557                 return 2;
 558                 }
 559         return 1;
 560 }
 561
 562 static int ssl3_get_client_hello(SSL *s)
 563         {
 564         int i,j,ok,al,ret= -1;
 565         long n;
 566         unsigned long id;
 567         unsigned char *p,*d,*q;
 568         SSL_CIPHER *c;
 569         SSL_COMP *comp=NULL;
 570         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 571
 572         /* We do this so that we will respond with our native type.
 573          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 574          * This down switching should be handled by a different method.
 575          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 576          * TLSv1.
 577          */
 578         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 579                 {
 580                 s->first_packet=1;
 581                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 582                 }
 583         n=ssl3_get_message(s,
 584                 SSL3_ST_SR_CLNT_HELLO_B,
 585                 SSL3_ST_SR_CLNT_HELLO_C,
 586                 SSL3_MT_CLIENT_HELLO,
 587                 SSL3_RT_MAX_PLAIN_LENGTH,
 588                 &ok);
 589
 590         if (!ok) return((int)n);
 591         d=p=(unsigned char *)s->init_buf->data;
 592
 593         /* use version from inside client hello, not from record header
 594          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 595         s->client_version=(((int)p[0])<<8)|(int)p[1];
 596         p+=2;
 597
 598         /* load the client random */
 599         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 600         p+=SSL3_RANDOM_SIZE;
 601
 602         /* get the session-id */
 603         j= *(p++);
 604
 605         s->hit=0;
 606         if (j == 0)
 607                 {
 608                 if (!ssl_get_new_session(s,1))
 609                         goto err;
 610                 }
 611         else
 612                 {
 613                 i=ssl_get_prev_session(s,p,j);
 614                 if (i == 1)
 615                         { /* previous session */
 616                         s->hit=1;
 617                         }
 618                 else if (i == -1)
 619                         goto err;
 620                 else /* i == 0 */
 621                         {
 622                         if (!ssl_get_new_session(s,1))
 623                                 goto err;
 624                         }
 625                 }
 626
 627         p+=j;
 628         n2s(p,i);
 629         if ((i == 0) && (j != 0))
 630                 {
 631                 /* we need a cipher if we are not resuming a session */
 632                 al=SSL_AD_ILLEGAL_PARAMETER;
 633                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 634                 goto f_err;
 635                 }
 636         if ((i+p) > (d+n))
 637                 {
 638                 /* not enough data */
 639                 al=SSL_AD_DECODE_ERROR;
 640                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 641                 goto f_err;
 642                 }
 643         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 644                 == NULL))
 645                 {
 646                 goto err;
 647                 }
 648         p+=i;
 649
 650         /* If it is a hit, check that the cipher is in the list */
 651         if ((s->hit) && (i > 0))
 652                 {
 653                 j=0;
 654                 id=s->session->cipher->id;
 655
 656 #ifdef CIPHER_DEBUG
 657                 printf("client sent %d ciphers\n",sk_num(ciphers));
 658 #endif
 659                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 660                         {
 661                         c=sk_SSL_CIPHER_value(ciphers,i);
 662 #ifdef CIPHER_DEBUG
 663                         printf("client [%2d of %2d]:%s\n",
 664                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 665 #endif
 666                         if (c->id == id)
 667                                 {
 668                                 j=1;
 669                                 break;
 670                                 }
 671                         }
 672                 if (j == 0)
 673                         {
 674                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 675                                 {
 676                                 /* Very bad for multi-threading.... */
 677                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 678                                                                        0);
 679                                 }
 680                         else
 681                                 {
 682                                 /* we need to have the cipher in the cipher
 683                                  * list if we are asked to reuse it */
 684                                 al=SSL_AD_ILLEGAL_PARAMETER;
 685                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 686                                 goto f_err;
 687                                 }
 688                         }
 689                 }
 690
 691         /* compression */
 692         i= *(p++);
 693         q=p;
 694         for (j=0; j<i; j++)
 695                 {
 696                 if (p[j] == 0) break;
 697                 }
 698
 699         p+=i;
 700         if (j >= i)
 701                 {
 702                 /* no compress */
 703                 al=SSL_AD_DECODE_ERROR;
 704                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 705                 goto f_err;
 706                 }
 707
 708         /* Worst case, we will use the NULL compression, but if we have other
 709          * options, we will now look for them.  We have i-1 compression
 710          * algorithms from the client, starting at q. */
 711         s->s3->tmp.new_compression=NULL;
 712         if (s->ctx->comp_methods != NULL)
 713                 { /* See if we have a match */
 714                 int m,nn,o,v,done=0;
 715
 716                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 717                 for (m=0; m<nn; m++)
 718                         {
 719                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 720                         v=comp->id;
 721                         for (o=0; o<i; o++)
 722                                 {
 723                                 if (v == q[o])
 724                                         {
 725                                         done=1;
 726                                         break;
 727                                         }
 728                                 }
 729                         if (done) break;
 730                         }
 731                 if (done)
 732                         s->s3->tmp.new_compression=comp;
 733                 else
 734                         comp=NULL;
 735                 }
 736
 737         /* TLS does not mind if there is extra stuff */
 738         if (s->version == SSL3_VERSION)
 739                 {
 740                 if (p > (d+n))
 741                         {
 742                         /* wrong number of bytes,
 743                          * there could be more to follow */
 744                         al=SSL_AD_DECODE_ERROR;
 745                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 746                         goto f_err;
 747                         }
 748                 }
 749
 750         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 751          * pick a cipher */
 752
 753         if (!s->hit)
 754                 {
 755                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 756                 if (s->session->ciphers != NULL)
 757                         sk_SSL_CIPHER_free(s->session->ciphers);
 758                 s->session->ciphers=ciphers;
 759                 if (ciphers == NULL)
 760                         {
 761                         al=SSL_AD_ILLEGAL_PARAMETER;
 762                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 763                         goto f_err;
 764                         }
 765                 ciphers=NULL;
 766                 c=ssl3_choose_cipher(s,s->session->ciphers,
 767                                      ssl_get_ciphers_by_id(s));
 768
 769                 if (c == NULL)
 770                         {
 771                         al=SSL_AD_HANDSHAKE_FAILURE;
 772                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 773                         goto f_err;
 774                         }
 775                 s->s3->tmp.new_cipher=c;
 776                 }
 777         else
 778                 {
 779                 /* Session-id reuse */
 780 #ifdef REUSE_CIPHER_BUG
 781                 STACK_OF(SSL_CIPHER) *sk;
 782                 SSL_CIPHER *nc=NULL;
 783                 SSL_CIPHER *ec=NULL;
 784
 785                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 786                         {
 787                         sk=s->session->ciphers;
 788                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 789                                 {
 790                                 c=sk_SSL_CIPHER_value(sk,i);
 791                                 if (c->algorithms & SSL_eNULL)
 792                                         nc=c;
 793                                 if (SSL_C_IS_EXPORT(c))
 794                                         ec=c;
 795                                 }
 796                         if (nc != NULL)
 797                                 s->s3->tmp.new_cipher=nc;
 798                         else if (ec != NULL)
 799                                 s->s3->tmp.new_cipher=ec;
 800                         else
 801                                 s->s3->tmp.new_cipher=s->session->cipher;
 802                         }
 803                 else
 804 #endif
 805                 s->s3->tmp.new_cipher=s->session->cipher;
 806                 }
 807
 808         /* we now have the following setup.
 809          * client_random
 810          * cipher_list          - our prefered list of ciphers
 811          * ciphers              - the clients prefered list of ciphers
 812          * compression          - basically ignored right now
 813          * ssl version is set   - sslv3
 814          * s->session           - The ssl session has been setup.
 815          * s->hit               - session reuse flag
 816          * s->tmp.new_cipher    - the new cipher to use.
 817          */
 818
 819         ret=1;
 820         if (0)
 821                 {
 822 f_err:
 823                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 824                 }
 825 err:
 826         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 827         return(ret);
 828         }
 829
 830 static int ssl3_send_server_hello(SSL *s)
 831         {
 832         unsigned char *buf;
 833         unsigned char *p,*d;
 834         int i,sl;
 835         unsigned long l,Time;
 836
 837         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 838                 {
 839                 buf=(unsigned char *)s->init_buf->data;
 840                 p=s->s3->server_random;
 841                 Time=time(NULL);                        /* Time */
 842                 l2n(Time,p);
 843                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 844                 /* Do the message type and length last */
 845                 d=p= &(buf[4]);
 846
 847                 *(p++)=s->version>>8;
 848                 *(p++)=s->version&0xff;
 849
 850                 /* Random stuff */
 851                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 852                 p+=SSL3_RANDOM_SIZE;
 853
 854                 /* now in theory we have 3 options to sending back the
 855                  * session id.  If it is a re-use, we send back the
 856                  * old session-id, if it is a new session, we send
 857                  * back the new session-id or we send back a 0 length
 858                  * session-id if we want it to be single use.
 859                  * Currently I will not implement the '0' length session-id
 860                  * 12-Jan-98 - I'll now support the '0' length stuff.
 861                  */
 862                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 863                         s->session->session_id_length=0;
 864
 865                 sl=s->session->session_id_length;
 866                 *(p++)=sl;
 867                 memcpy(p,s->session->session_id,sl);
 868                 p+=sl;
 869
 870                 /* put the cipher */
 871                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 872                 p+=i;
 873
 874                 /* put the compression method */
 875                 if (s->s3->tmp.new_compression == NULL)
 876                         *(p++)=0;
 877                 else
 878                         *(p++)=s->s3->tmp.new_compression->id;
 879
 880                 /* do the header */
 881                 l=(p-d);
 882                 d=buf;
 883                 *(d++)=SSL3_MT_SERVER_HELLO;
 884                 l2n3(l,d);
 885
 886                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 887                 /* number of bytes to write */
 888                 s->init_num=p-buf;
 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_done(SSL *s)
 897         {
 898         unsigned char *p;
 899
 900         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 901                 {
 902                 p=(unsigned char *)s->init_buf->data;
 903
 904                 /* do the header */
 905                 *(p++)=SSL3_MT_SERVER_DONE;
 906                 *(p++)=0;
 907                 *(p++)=0;
 908                 *(p++)=0;
 909
 910                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 911                 /* number of bytes to write */
 912                 s->init_num=4;
 913                 s->init_off=0;
 914                 }
 915
 916         /* SSL3_ST_CW_CLNT_HELLO_B */
 917         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 918         }
 919
 920 static int ssl3_send_server_key_exchange(SSL *s)
 921         {
 922 #ifndef NO_RSA
 923         unsigned char *q;
 924         int j,num;
 925         RSA *rsa;
 926         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 927         unsigned int u;
 928 #endif
 929 #ifndef NO_DH
 930         DH *dh=NULL,*dhp;
 931 #endif
 932         EVP_PKEY *pkey;
 933         unsigned char *p,*d;
 934         int al,i;
 935         unsigned long type;
 936         int n;
 937         CERT *cert;
 938         BIGNUM *r[4];
 939         int nr[4],kn;
 940         BUF_MEM *buf;
 941         EVP_MD_CTX md_ctx;
 942
 943         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 944                 {
 945                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 946                 cert=s->cert;
 947
 948                 buf=s->init_buf;
 949
 950                 r[0]=r[1]=r[2]=r[3]=NULL;
 951                 n=0;
 952 #ifndef NO_RSA
 953                 if (type & SSL_kRSA)
 954                         {
 955                         rsa=cert->rsa_tmp;
 956                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 957                                 {
 958                                 rsa=s->cert->rsa_tmp_cb(s,
 959                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 960                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 961                                 if(rsa == NULL)
 962                                 {
 963                                         al=SSL_AD_HANDSHAKE_FAILURE;
 964                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 965                                         goto f_err;
 966                                 }
 967                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 968                                 cert->rsa_tmp=rsa;
 969                                 }
 970                         if (rsa == NULL)
 971                                 {
 972                                 al=SSL_AD_HANDSHAKE_FAILURE;
 973                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 974                                 goto f_err;
 975                                 }
 976                         r[0]=rsa->n;
 977                         r[1]=rsa->e;
 978                         s->s3->tmp.use_rsa_tmp=1;
 979                         }
 980                 else
 981 #endif
 982 #ifndef NO_DH
 983                         if (type & SSL_kEDH)
 984                         {
 985                         dhp=cert->dh_tmp;
 986                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 987                                 dhp=s->cert->dh_tmp_cb(s,
 988                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 989                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 990                         if (dhp == NULL)
 991                                 {
 992                                 al=SSL_AD_HANDSHAKE_FAILURE;
 993                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 994                                 goto f_err;
 995                                 }
 996
 997                         if (s->s3->tmp.dh != NULL)
 998                                 {
 999                                 DH_free(dh);
1000                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, SSL_R_INTERNAL_ERROR);
1001                                 goto err;
1002                                 }
1003
1004                         if ((dh=DHparams_dup(dhp)) == NULL)
1005                                 {
1006                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1007                                 goto err;
1008                                 }
1009
1010                         s->s3->tmp.dh=dh;
1011                         if ((dhp->pub_key == NULL ||
1012                              dhp->priv_key == NULL ||
1013                              (s->options & SSL_OP_SINGLE_DH_USE)))
1014                                 {
1015                                 if(!DH_generate_key(dh))
1016                                     {
1017                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1018                                            ERR_R_DH_LIB);
1019                                     goto err;
1020                                     }
1021                                 }
1022                         else
1023                                 {
1024                                 dh->pub_key=BN_dup(dhp->pub_key);
1025                                 dh->priv_key=BN_dup(dhp->priv_key);
1026                                 if ((dh->pub_key == NULL) ||
1027                                         (dh->priv_key == NULL))
1028                                         {
1029                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1030                                         goto err;
1031                                         }
1032                                 }
1033                         r[0]=dh->p;
1034                         r[1]=dh->g;
1035                         r[2]=dh->pub_key;
1036                         }
1037                 else
1038 #endif
1039                         {
1040                         al=SSL_AD_HANDSHAKE_FAILURE;
1041                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1042                         goto f_err;
1043                         }
1044                 for (i=0; r[i] != NULL; i++)
1045                         {
1046                         nr[i]=BN_num_bytes(r[i]);
1047                         n+=2+nr[i];
1048                         }
1049
1050                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1051                         {
1052                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1053                                 == NULL)
1054                                 {
1055                                 al=SSL_AD_DECODE_ERROR;
1056                                 goto f_err;
1057                                 }
1058                         kn=EVP_PKEY_size(pkey);
1059                         }
1060                 else
1061                         {
1062                         pkey=NULL;
1063                         kn=0;
1064                         }
1065
1066                 if (!BUF_MEM_grow(buf,n+4+kn))
1067                         {
1068                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1069                         goto err;
1070                         }
1071                 d=(unsigned char *)s->init_buf->data;
1072                 p= &(d[4]);
1073
1074                 for (i=0; r[i] != NULL; i++)
1075                         {
1076                         s2n(nr[i],p);
1077                         BN_bn2bin(r[i],p);
1078                         p+=nr[i];
1079                         }
1080
1081                 /* not anonymous */
1082                 if (pkey != NULL)
1083                         {
1084                         /* n is the length of the params, they start at &(d[4])
1085                          * and p points to the space at the end. */
1086 #ifndef NO_RSA
1087                         if (pkey->type == EVP_PKEY_RSA)
1088                                 {
1089                                 q=md_buf;
1090                                 j=0;
1091                                 for (num=2; num > 0; num--)
1092                                         {
1093                                         EVP_DigestInit(&md_ctx,(num == 2)
1094                                                 ?s->ctx->md5:s->ctx->sha1);
1095                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1096                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1097                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1098                                         EVP_DigestFinal(&md_ctx,q,
1099                                                 (unsigned int *)&i);
1100                                         q+=i;
1101                                         j+=i;
1102                                         }
1103                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1104                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1105                                         {
1106                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1107                                         goto err;
1108                                         }
1109                                 s2n(u,p);
1110                                 n+=u+2;
1111                                 }
1112                         else
1113 #endif
1114 #if !defined(NO_DSA)
1115                                 if (pkey->type == EVP_PKEY_DSA)
1116                                 {
1117                                 /* lets do DSS */
1118                                 EVP_SignInit(&md_ctx,EVP_dss1());
1119                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1120                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1121                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1122                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1123                                         (unsigned int *)&i,pkey))
1124                                         {
1125                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1126                                         goto err;
1127                                         }
1128                                 s2n(i,p);
1129                                 n+=i+2;
1130                                 }
1131                         else
1132 #endif
1133                                 {
1134                                 /* Is this error check actually needed? */
1135                                 al=SSL_AD_HANDSHAKE_FAILURE;
1136                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1137                                 goto f_err;
1138                                 }
1139                         }
1140
1141                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1142                 l2n3(n,d);
1143
1144                 /* we should now have things packed up, so lets send
1145                  * it off */
1146                 s->init_num=n+4;
1147                 s->init_off=0;
1148                 }
1149
1150         s->state = SSL3_ST_SW_KEY_EXCH_B;
1151         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1152 f_err:
1153         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1154 err:
1155         return(-1);
1156         }
1157
1158 static int ssl3_send_certificate_request(SSL *s)
1159         {
1160         unsigned char *p,*d;
1161         int i,j,nl,off,n;
1162         STACK_OF(X509_NAME) *sk=NULL;
1163         X509_NAME *name;
1164         BUF_MEM *buf;
1165
1166         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1167                 {
1168                 buf=s->init_buf;
1169
1170                 d=p=(unsigned char *)&(buf->data[4]);
1171
1172                 /* get the list of acceptable cert types */
1173                 p++;
1174                 n=ssl3_get_req_cert_type(s,p);
1175                 d[0]=n;
1176                 p+=n;
1177                 n++;
1178
1179                 off=n;
1180                 p+=2;
1181                 n+=2;
1182
1183                 sk=SSL_get_client_CA_list(s);
1184                 nl=0;
1185                 if (sk != NULL)
1186                         {
1187                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1188                                 {
1189                                 name=sk_X509_NAME_value(sk,i);
1190                                 j=i2d_X509_NAME(name,NULL);
1191                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1192                                         {
1193                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1194                                         goto err;
1195                                         }
1196                                 p=(unsigned char *)&(buf->data[4+n]);
1197                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1198                                         {
1199                                         s2n(j,p);
1200                                         i2d_X509_NAME(name,&p);
1201                                         n+=2+j;
1202                                         nl+=2+j;
1203                                         }
1204                                 else
1205                                         {
1206                                         d=p;
1207                                         i2d_X509_NAME(name,&p);
1208                                         j-=2; s2n(j,d); j+=2;
1209                                         n+=j;
1210                                         nl+=j;
1211                                         }
1212                                 }
1213                         }
1214                 /* else no CA names */
1215                 p=(unsigned char *)&(buf->data[4+off]);
1216                 s2n(nl,p);
1217
1218                 d=(unsigned char *)buf->data;
1219                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1220                 l2n3(n,d);
1221
1222                 /* we should now have things packed up, so lets send
1223                  * it off */
1224
1225                 s->init_num=n+4;
1226                 s->init_off=0;
1227 #ifdef NETSCAPE_HANG_BUG
1228                 p=(unsigned char *)s->init_buf->data + s->init_num;
1229
1230                 /* do the header */
1231                 *(p++)=SSL3_MT_SERVER_DONE;
1232                 *(p++)=0;
1233                 *(p++)=0;
1234                 *(p++)=0;
1235                 s->init_num += 4;
1236 #endif
1237
1238                 }
1239
1240         /* SSL3_ST_SW_CERT_REQ_B */
1241         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1242 err:
1243         return(-1);
1244         }
1245
1246 static int ssl3_get_client_key_exchange(SSL *s)
1247         {
1248         int i,al,ok;
1249         long n;
1250         unsigned long l;
1251         unsigned char *p;
1252 #ifndef NO_RSA
1253         RSA *rsa=NULL;
1254         EVP_PKEY *pkey=NULL;
1255 #endif
1256 #ifndef NO_DH
1257         BIGNUM *pub=NULL;
1258         DH *dh_srvr;
1259 #endif
1260
1261         n=ssl3_get_message(s,
1262                 SSL3_ST_SR_KEY_EXCH_A,
1263                 SSL3_ST_SR_KEY_EXCH_B,
1264                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1265                 400, /* ???? */
1266                 &ok);
1267
1268         if (!ok) return((int)n);
1269         p=(unsigned char *)s->init_buf->data;
1270
1271         l=s->s3->tmp.new_cipher->algorithms;
1272
1273 #ifndef NO_RSA
1274         if (l & SSL_kRSA)
1275                 {
1276                 /* FIX THIS UP EAY EAY EAY EAY */
1277                 if (s->s3->tmp.use_rsa_tmp)
1278                         {
1279                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1280                                 rsa=s->cert->rsa_tmp;
1281                         /* Don't do a callback because rsa_tmp should
1282                          * be sent already */
1283                         if (rsa == NULL)
1284                                 {
1285                                 al=SSL_AD_HANDSHAKE_FAILURE;
1286                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1287                                 goto f_err;
1288
1289                                 }
1290                         }
1291                 else
1292                         {
1293                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1294                         if (    (pkey == NULL) ||
1295                                 (pkey->type != EVP_PKEY_RSA) ||
1296                                 (pkey->pkey.rsa == NULL))
1297                                 {
1298                                 al=SSL_AD_HANDSHAKE_FAILURE;
1299                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1300                                 goto f_err;
1301                                 }
1302                         rsa=pkey->pkey.rsa;
1303                         }
1304
1305                 /* TLS */
1306                 if (s->version > SSL3_VERSION)
1307                         {
1308                         n2s(p,i);
1309                         if (n != i+2)
1310                                 {
1311                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1312                                         {
1313                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1314                                         goto err;
1315                                         }
1316                                 else
1317                                         p-=2;
1318                                 }
1319                         else
1320                                 n=i;
1321                         }
1322
1323                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1324
1325                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1326                         {
1327                         al=SSL_AD_DECODE_ERROR;
1328                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1329                         goto f_err;
1330                         }
1331
1332                 if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1333                         {
1334                         /* The premaster secret must contain the same version number as the
1335                          * ClientHello to detect version rollback attacks (strangely, the
1336                          * protocol does not offer such protection for DH ciphersuites).
1337                          * However, buggy clients exist that send the negotiated protocol
1338                          * version instead if the server does not support the requested
1339                          * protocol version.
1340                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1341                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1342                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1343                                 {
1344                                 al=SSL_AD_DECODE_ERROR;
1345                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1346                                 goto f_err;
1347                                 }
1348                         }
1349
1350                 s->session->master_key_length=
1351                         s->method->ssl3_enc->generate_master_secret(s,
1352                                 s->session->master_key,
1353                                 p,i);
1354                 memset(p,0,i);
1355                 }
1356         else
1357 #endif
1358 #ifndef NO_DH
1359                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1360                 {
1361                 n2s(p,i);
1362                 if (n != i+2)
1363                         {
1364                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1365                                 {
1366                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1367                                 goto err;
1368                                 }
1369                         else
1370                                 {
1371                                 p-=2;
1372                                 i=(int)n;
1373                                 }
1374                         }
1375
1376                 if (n == 0L) /* the parameters are in the cert */
1377                         {
1378                         al=SSL_AD_HANDSHAKE_FAILURE;
1379                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1380                         goto f_err;
1381                         }
1382                 else
1383                         {
1384                         if (s->s3->tmp.dh == NULL)
1385                                 {
1386                                 al=SSL_AD_HANDSHAKE_FAILURE;
1387                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1388                                 goto f_err;
1389                                 }
1390                         else
1391                                 dh_srvr=s->s3->tmp.dh;
1392                         }
1393
1394                 pub=BN_bin2bn(p,i,NULL);
1395                 if (pub == NULL)
1396                         {
1397                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1398                         goto err;
1399                         }
1400
1401                 i=DH_compute_key(p,pub,dh_srvr);
1402
1403                 if (i <= 0)
1404                         {
1405                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1406                         goto err;
1407                         }
1408
1409                 DH_free(s->s3->tmp.dh);
1410                 s->s3->tmp.dh=NULL;
1411
1412                 BN_clear_free(pub);
1413                 pub=NULL;
1414                 s->session->master_key_length=
1415                         s->method->ssl3_enc->generate_master_secret(s,
1416                                 s->session->master_key,p,i);
1417                 }
1418         else
1419 #endif
1420                 {
1421                 al=SSL_AD_HANDSHAKE_FAILURE;
1422                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1423                 goto f_err;
1424                 }
1425
1426         return(1);
1427 f_err:
1428         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1429 #if !defined(NO_DH) || !defined(NO_RSA)
1430 err:
1431 #endif
1432         return(-1);
1433         }
1434
1435 static int ssl3_get_cert_verify(SSL *s)
1436         {
1437         EVP_PKEY *pkey=NULL;
1438         unsigned char *p;
1439         int al,ok,ret=0;
1440         long n;
1441         int type=0,i,j;
1442         X509 *peer;
1443
1444         n=ssl3_get_message(s,
1445                 SSL3_ST_SR_CERT_VRFY_A,
1446                 SSL3_ST_SR_CERT_VRFY_B,
1447                 -1,
1448                 512, /* 512? */
1449                 &ok);
1450
1451         if (!ok) return((int)n);
1452
1453         if (s->session->peer != NULL)
1454                 {
1455                 peer=s->session->peer;
1456                 pkey=X509_get_pubkey(peer);
1457                 type=X509_certificate_type(peer,pkey);
1458                 }
1459         else
1460                 {
1461                 peer=NULL;
1462                 pkey=NULL;
1463                 }
1464
1465         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1466                 {
1467                 s->s3->tmp.reuse_message=1;
1468                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1469                         {
1470                         al=SSL_AD_UNEXPECTED_MESSAGE;
1471                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1472                         goto f_err;
1473                         }
1474                 ret=1;
1475                 goto end;
1476                 }
1477
1478         if (peer == NULL)
1479                 {
1480                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1481                 al=SSL_AD_UNEXPECTED_MESSAGE;
1482                 goto f_err;
1483                 }
1484
1485         if (!(type & EVP_PKT_SIGN))
1486                 {
1487                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1488                 al=SSL_AD_ILLEGAL_PARAMETER;
1489                 goto f_err;
1490                 }
1491
1492         if (s->s3->change_cipher_spec)
1493                 {
1494                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1495                 al=SSL_AD_UNEXPECTED_MESSAGE;
1496                 goto f_err;
1497                 }
1498
1499         /* we now have a signature that we need to verify */
1500         p=(unsigned char *)s->init_buf->data;
1501         n2s(p,i);
1502         n-=2;
1503         if (i > n)
1504                 {
1505                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1506                 al=SSL_AD_DECODE_ERROR;
1507                 goto f_err;
1508                 }
1509
1510         j=EVP_PKEY_size(pkey);
1511         if ((i > j) || (n > j) || (n <= 0))
1512                 {
1513                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1514                 al=SSL_AD_DECODE_ERROR;
1515                 goto f_err;
1516                 }
1517
1518 #ifndef NO_RSA
1519         if (pkey->type == EVP_PKEY_RSA)
1520                 {
1521                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1522                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1523                                                         pkey->pkey.rsa);
1524                 if (i < 0)
1525                         {
1526                         al=SSL_AD_DECRYPT_ERROR;
1527                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1528                         goto f_err;
1529                         }
1530                 if (i == 0)
1531                         {
1532                         al=SSL_AD_DECRYPT_ERROR;
1533                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1534                         goto f_err;
1535                         }
1536                 }
1537         else
1538 #endif
1539 #ifndef NO_DSA
1540                 if (pkey->type == EVP_PKEY_DSA)
1541                 {
1542                 j=DSA_verify(pkey->save_type,
1543                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1544                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1545                 if (j <= 0)
1546                         {
1547                         /* bad signature */
1548                         al=SSL_AD_DECRYPT_ERROR;
1549                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1550                         goto f_err;
1551                         }
1552                 }
1553         else
1554 #endif
1555                 {
1556                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1557                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1558                 goto f_err;
1559                 }
1560
1561
1562         ret=1;
1563         if (0)
1564                 {
1565 f_err:
1566                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1567                 }
1568 end:
1569         EVP_PKEY_free(pkey);
1570         return(ret);
1571         }
1572
1573 static int ssl3_get_client_certificate(SSL *s)
1574         {
1575         int i,ok,al,ret= -1;
1576         X509 *x=NULL;
1577         unsigned long l,nc,llen,n;
1578         unsigned char *p,*d,*q;
1579         STACK_OF(X509) *sk=NULL;
1580
1581         n=ssl3_get_message(s,
1582                 SSL3_ST_SR_CERT_A,
1583                 SSL3_ST_SR_CERT_B,
1584                 -1,
1585 #if defined(MSDOS) && !defined(WIN32)
1586                 1024*30, /* 30k max cert list :-) */
1587 #else
1588                 1024*100, /* 100k max cert list :-) */
1589 #endif
1590                 &ok);
1591
1592         if (!ok) return((int)n);
1593
1594         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1595                 {
1596                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1597                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1598                         {
1599                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1600                         al=SSL_AD_HANDSHAKE_FAILURE;
1601                         goto f_err;
1602                         }
1603                 /* If tls asked for a client cert, the client must return a 0 list */
1604                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1605                         {
1606                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1607                         al=SSL_AD_UNEXPECTED_MESSAGE;
1608                         goto f_err;
1609                         }
1610                 s->s3->tmp.reuse_message=1;
1611                 return(1);
1612                 }
1613
1614         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1615                 {
1616                 al=SSL_AD_UNEXPECTED_MESSAGE;
1617                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1618                 goto f_err;
1619                 }
1620         d=p=(unsigned char *)s->init_buf->data;
1621
1622         if ((sk=sk_X509_new_null()) == NULL)
1623                 {
1624                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1625                 goto err;
1626                 }
1627
1628         n2l3(p,llen);
1629         if (llen+3 != n)
1630                 {
1631                 al=SSL_AD_DECODE_ERROR;
1632                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1633                 goto f_err;
1634                 }
1635         for (nc=0; nc<llen; )
1636                 {
1637                 n2l3(p,l);
1638                 if ((l+nc+3) > llen)
1639                         {
1640                         al=SSL_AD_DECODE_ERROR;
1641                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1642                         goto f_err;
1643                         }
1644
1645                 q=p;
1646                 x=d2i_X509(NULL,&p,l);
1647                 if (x == NULL)
1648                         {
1649                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1650                         goto err;
1651                         }
1652                 if (p != (q+l))
1653                         {
1654                         al=SSL_AD_DECODE_ERROR;
1655                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1656                         goto f_err;
1657                         }
1658                 if (!sk_X509_push(sk,x))
1659                         {
1660                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1661                         goto err;
1662                         }
1663                 x=NULL;
1664                 nc+=l+3;
1665                 }
1666
1667         if (sk_X509_num(sk) <= 0)
1668                 {
1669                 /* TLS does not mind 0 certs returned */
1670                 if (s->version == SSL3_VERSION)
1671                         {
1672                         al=SSL_AD_HANDSHAKE_FAILURE;
1673                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1674                         goto f_err;
1675                         }
1676                 /* Fail for TLS only if we required a certificate */
1677                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1678                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1679                         {
1680                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1681                         al=SSL_AD_HANDSHAKE_FAILURE;
1682                         goto f_err;
1683                         }
1684                 }
1685         else
1686                 {
1687                 i=ssl_verify_cert_chain(s,sk);
1688                 if (!i)
1689                         {
1690                         al=ssl_verify_alarm_type(s->verify_result);
1691                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1692                         goto f_err;
1693                         }
1694                 }
1695
1696         if (s->session->peer != NULL) /* This should not be needed */
1697                 X509_free(s->session->peer);
1698         s->session->peer=sk_X509_shift(sk);
1699         s->session->verify_result = s->verify_result;
1700
1701         /* With the current implementation, sess_cert will always be NULL
1702          * when we arrive here. */
1703         if (s->session->sess_cert == NULL)
1704                 {
1705                 s->session->sess_cert = ssl_sess_cert_new();
1706                 if (s->session->sess_cert == NULL)
1707                         {
1708                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1709                         goto err;
1710                         }
1711                 }
1712         if (s->session->sess_cert->cert_chain != NULL)
1713                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1714         s->session->sess_cert->cert_chain=sk;
1715         /* Inconsistency alert: cert_chain does *not* include the
1716          * peer's own certificate, while we do include it in s3_clnt.c */
1717
1718         sk=NULL;
1719
1720         ret=1;
1721         if (0)
1722                 {
1723 f_err:
1724                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1725                 }
1726 err:
1727         if (x != NULL) X509_free(x);
1728         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1729         return(ret);
1730         }
1731
1732 int ssl3_send_server_certificate(SSL *s)
1733         {
1734         unsigned long l;
1735         X509 *x;
1736
1737         if (s->state == SSL3_ST_SW_CERT_A)
1738                 {
1739                 x=ssl_get_server_send_cert(s);
1740                 if (x == NULL)
1741                         {
1742                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1743                         return(0);
1744                         }
1745
1746                 l=ssl3_output_cert_chain(s,x);
1747                 s->state=SSL3_ST_SW_CERT_B;
1748                 s->init_num=(int)l;
1749                 s->init_off=0;
1750                 }
1751
1752         /* SSL3_ST_SW_CERT_B */
1753         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1754         }