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_send_server_hello(SSL *s);
  74 static int ssl3_send_server_key_exchange(SSL *s);
  75 static int ssl3_send_certificate_request(SSL *s);
  76 static int ssl3_send_server_done(SSL *s);
  77 static int ssl3_get_cert_verify(SSL *s);
  78 static int ssl3_get_client_key_exchange(SSL *s);
  79 static int ssl3_get_client_certificate(SSL *s);
  80 static int ssl3_send_hello_request(SSL *s);
  81
  82 static SSL_METHOD *ssl3_get_server_method(int ver)
  83         {
  84         if (ver == SSL3_VERSION)
  85                 return(SSLv3_server_method());
  86         else
  87                 return(NULL);
  88         }
  89
  90 SSL_METHOD *SSLv3_server_method(void)
  91         {
  92         static int init=1;
  93         static SSL_METHOD SSLv3_server_data;
  94
  95         if (init)
  96                 {
  97                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
  98                         sizeof(SSL_METHOD));
  99                 SSLv3_server_data.ssl_accept=ssl3_accept;
 100                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 101                 init=0;
 102                 }
 103         return(&SSLv3_server_data);
 104         }
 105
 106 int ssl3_accept(SSL *s)
 107         {
 108         BUF_MEM *buf;
 109         unsigned long l,Time=time(NULL);
 110         void (*cb)()=NULL;
 111         long num1;
 112         int ret= -1;
 113         int new_state,state,skip=0;
 114
 115         RAND_seed(&Time,sizeof(Time));
 116         ERR_clear_error();
 117         clear_sys_error();
 118
 119         if (s->info_callback != NULL)
 120                 cb=s->info_callback;
 121         else if (s->ctx->info_callback != NULL)
 122                 cb=s->ctx->info_callback;
 123
 124         /* init things to blank */
 125         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 126         s->in_handshake++;
 127
 128         if (s->cert == NULL)
 129                 {
 130                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 131                 return(-1);
 132                 }
 133
 134         for (;;)
 135                 {
 136                 state=s->state;
 137
 138                 switch (s->state)
 139                         {
 140                 case SSL_ST_RENEGOTIATE:
 141                         s->new_session=1;
 142                         /* s->state=SSL_ST_ACCEPT; */
 143
 144                 case SSL_ST_BEFORE:
 145                 case SSL_ST_ACCEPT:
 146                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 147                 case SSL_ST_OK|SSL_ST_ACCEPT:
 148
 149                         s->server=1;
 150                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 151
 152                         if ((s->version>>8) != 3)
 153                                 abort();
 154                         /* s->version=SSL3_VERSION; */
 155                         s->type=SSL_ST_ACCEPT;
 156
 157                         if (s->init_buf == NULL)
 158                                 {
 159                                 if ((buf=BUF_MEM_new()) == NULL)
 160                                         {
 161                                         ret= -1;
 162                                         goto end;
 163                                         }
 164                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 165                                         {
 166                                         ret= -1;
 167                                         goto end;
 168                                         }
 169                                 s->init_buf=buf;
 170                                 }
 171
 172                         if (!ssl3_setup_buffers(s))
 173                                 {
 174                                 ret= -1;
 175                                 goto end;
 176                                 }
 177
 178                         /* Ok, we now need to push on a buffering BIO so that
 179                          * the output is sent in a way that TCP likes :-)
 180                          */
 181                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 182
 183                         s->init_num=0;
 184
 185                         if (s->state != SSL_ST_RENEGOTIATE)
 186                                 {
 187                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 188                                 ssl3_init_finished_mac(s);
 189                                 s->ctx->stats.sess_accept++;
 190                                 }
 191                         else
 192                                 {
 193                                 s->ctx->stats.sess_accept_renegotiate++;
 194                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 195                                 }
 196                         break;
 197
 198                 case SSL3_ST_SW_HELLO_REQ_A:
 199                 case SSL3_ST_SW_HELLO_REQ_B:
 200
 201                         s->shutdown=0;
 202                         ret=ssl3_send_hello_request(s);
 203                         if (ret <= 0) goto end;
 204                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 205                         s->state=SSL3_ST_SW_FLUSH;
 206                         s->init_num=0;
 207
 208                         ssl3_init_finished_mac(s);
 209                         break;
 210
 211                 case SSL3_ST_SW_HELLO_REQ_C:
 212                         s->state=SSL_ST_OK;
 213                         ret=1;
 214                         goto end;
 215                         /* break; */
 216
 217                 case SSL3_ST_SR_CLNT_HELLO_A:
 218                 case SSL3_ST_SR_CLNT_HELLO_B:
 219                 case SSL3_ST_SR_CLNT_HELLO_C:
 220
 221                         s->shutdown=0;
 222                         ret=ssl3_get_client_hello(s);
 223                         if (ret <= 0) goto end;
 224                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 225                         s->init_num=0;
 226                         break;
 227
 228                 case SSL3_ST_SW_SRVR_HELLO_A:
 229                 case SSL3_ST_SW_SRVR_HELLO_B:
 230                         ret=ssl3_send_server_hello(s);
 231                         if (ret <= 0) goto end;
 232
 233                         if (s->hit)
 234                                 s->state=SSL3_ST_SW_CHANGE_A;
 235                         else
 236                                 s->state=SSL3_ST_SW_CERT_A;
 237                         s->init_num=0;
 238                         break;
 239
 240                 case SSL3_ST_SW_CERT_A:
 241                 case SSL3_ST_SW_CERT_B:
 242                         /* Check if it is anon DH */
 243                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 244                                 {
 245                                 ret=ssl3_send_server_certificate(s);
 246                                 if (ret <= 0) goto end;
 247                                 }
 248                         else
 249                                 skip=1;
 250                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 251                         s->init_num=0;
 252                         break;
 253
 254                 case SSL3_ST_SW_KEY_EXCH_A:
 255                 case SSL3_ST_SW_KEY_EXCH_B:
 256                         l=s->s3->tmp.new_cipher->algorithms;
 257
 258                         /* clear this, it may get reset by
 259                          * send_server_key_exchange */
 260                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 261                                 s->s3->tmp.use_rsa_tmp=1;
 262                         else
 263                                 s->s3->tmp.use_rsa_tmp=0;
 264
 265                         /* only send if a DH key exchange, fortezza or
 266                          * RSA but we have a sign only certificate */
 267                         if (s->s3->tmp.use_rsa_tmp
 268                             || (l & (SSL_DH|SSL_kFZA))
 269                             || ((l & SSL_kRSA)
 270                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 271                                     || (SSL_IS_EXPORT(l)
 272                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_EXPORT_PKEYLENGTH(l)
 273                                         )
 274                                     )
 275                                 )
 276                             )
 277                                 {
 278                                 ret=ssl3_send_server_key_exchange(s);
 279                                 if (ret <= 0) goto end;
 280                                 }
 281                         else
 282                                 skip=1;
 283
 284                         s->state=SSL3_ST_SW_CERT_REQ_A;
 285                         s->init_num=0;
 286                         break;
 287
 288                 case SSL3_ST_SW_CERT_REQ_A:
 289                 case SSL3_ST_SW_CERT_REQ_B:
 290                         if (/* don't request cert unless asked for it: */
 291                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 292                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 293                                  * don't request cert during re-negotiation: */
 294                                 ((s->session->peer != NULL) &&
 295                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 296                                 /* never request cert in anonymous ciphersuites
 297                                  * (see section "Certificate request" in SSL 3 drafts
 298                                  * and in RFC 2246): */
 299                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 300                                  /* ... except when the application insists on verification
 301                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 302                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
 303                                 {
 304                                 /* no cert request */
 305                                 skip=1;
 306                                 s->s3->tmp.cert_request=0;
 307                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 308                                 }
 309                         else
 310                                 {
 311                                 s->s3->tmp.cert_request=1;
 312                                 ret=ssl3_send_certificate_request(s);
 313                                 if (ret <= 0) goto end;
 314                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 315                                 s->init_num=0;
 316                                 }
 317                         break;
 318
 319                 case SSL3_ST_SW_SRVR_DONE_A:
 320                 case SSL3_ST_SW_SRVR_DONE_B:
 321                         ret=ssl3_send_server_done(s);
 322                         if (ret <= 0) goto end;
 323                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 324                         s->state=SSL3_ST_SW_FLUSH;
 325                         s->init_num=0;
 326                         break;
 327
 328                 case SSL3_ST_SW_FLUSH:
 329                         /* number of bytes to be flushed */
 330                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 331                         if (num1 > 0)
 332                                 {
 333                                 s->rwstate=SSL_WRITING;
 334                                 num1=BIO_flush(s->wbio);
 335                                 if (num1 <= 0) { ret= -1; goto end; }
 336                                 s->rwstate=SSL_NOTHING;
 337                                 }
 338
 339                         s->state=s->s3->tmp.next_state;
 340                         break;
 341
 342                 case SSL3_ST_SR_CERT_A:
 343                 case SSL3_ST_SR_CERT_B:
 344                         /* could be sent for a DH cert, even if we
 345                          * have not asked for it :-) */
 346                         ret=ssl3_get_client_certificate(s);
 347                         if (ret <= 0) goto end;
 348                         s->init_num=0;
 349                         s->state=SSL3_ST_SR_KEY_EXCH_A;
 350                         break;
 351
 352                 case SSL3_ST_SR_KEY_EXCH_A:
 353                 case SSL3_ST_SR_KEY_EXCH_B:
 354                         ret=ssl3_get_client_key_exchange(s);
 355                         if (ret <= 0) goto end;
 356                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 357                         s->init_num=0;
 358
 359                         /* We need to get hashes here so if there is
 360                          * a client cert, it can be verified */
 361                         s->method->ssl3_enc->cert_verify_mac(s,
 362                                 &(s->s3->finish_dgst1),
 363                                 &(s->s3->tmp.finish_md[0]));
 364                         s->method->ssl3_enc->cert_verify_mac(s,
 365                                 &(s->s3->finish_dgst2),
 366                                 &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]));
 367
 368                         break;
 369
 370                 case SSL3_ST_SR_CERT_VRFY_A:
 371                 case SSL3_ST_SR_CERT_VRFY_B:
 372
 373                         /* we should decide if we expected this one */
 374                         ret=ssl3_get_cert_verify(s);
 375                         if (ret <= 0) goto end;
 376
 377                         s->state=SSL3_ST_SR_FINISHED_A;
 378                         s->init_num=0;
 379                         break;
 380
 381                 case SSL3_ST_SR_FINISHED_A:
 382                 case SSL3_ST_SR_FINISHED_B:
 383                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 384                                 SSL3_ST_SR_FINISHED_B);
 385                         if (ret <= 0) goto end;
 386                         if (s->hit)
 387                                 s->state=SSL_ST_OK;
 388                         else
 389                                 s->state=SSL3_ST_SW_CHANGE_A;
 390                         s->init_num=0;
 391                         break;
 392
 393                 case SSL3_ST_SW_CHANGE_A:
 394                 case SSL3_ST_SW_CHANGE_B:
 395
 396                         s->session->cipher=s->s3->tmp.new_cipher;
 397                         if (!s->method->ssl3_enc->setup_key_block(s))
 398                                 { ret= -1; goto end; }
 399
 400                         ret=ssl3_send_change_cipher_spec(s,
 401                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 402
 403                         if (ret <= 0) goto end;
 404                         s->state=SSL3_ST_SW_FINISHED_A;
 405                         s->init_num=0;
 406
 407                         if (!s->method->ssl3_enc->change_cipher_state(s,
 408                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 409                                 {
 410                                 ret= -1;
 411                                 goto end;
 412                                 }
 413
 414                         break;
 415
 416                 case SSL3_ST_SW_FINISHED_A:
 417                 case SSL3_ST_SW_FINISHED_B:
 418                         ret=ssl3_send_finished(s,
 419                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 420                                 s->method->ssl3_enc->server_finished,
 421                                 s->method->ssl3_enc->server_finished_len);
 422                         if (ret <= 0) goto end;
 423                         s->state=SSL3_ST_SW_FLUSH;
 424                         if (s->hit)
 425                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 426                         else
 427                                 s->s3->tmp.next_state=SSL_ST_OK;
 428                         s->init_num=0;
 429                         break;
 430
 431                 case SSL_ST_OK:
 432                         /* clean a few things up */
 433                         ssl3_cleanup_key_block(s);
 434
 435                         BUF_MEM_free(s->init_buf);
 436                         s->init_buf=NULL;
 437
 438                         /* remove buffering on output */
 439                         ssl_free_wbio_buffer(s);
 440
 441                         s->new_session=0;
 442                         s->init_num=0;
 443
 444                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 445
 446                         s->ctx->stats.sess_accept_good++;
 447                         /* s->server=1; */
 448                         s->handshake_func=ssl3_accept;
 449                         ret=1;
 450
 451                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 452
 453                         goto end;
 454                         /* break; */
 455
 456                 default:
 457                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 458                         ret= -1;
 459                         goto end;
 460                         /* break; */
 461                         }
 462
 463                 if (!s->s3->tmp.reuse_message && !skip)
 464                         {
 465                         if (s->debug)
 466                                 {
 467                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 468                                         goto end;
 469                                 }
 470
 471
 472                         if ((cb != NULL) && (s->state != state))
 473                                 {
 474                                 new_state=s->state;
 475                                 s->state=state;
 476                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 477                                 s->state=new_state;
 478                                 }
 479                         }
 480                 skip=0;
 481                 }
 482 end:
 483         /* BIO_flush(s->wbio); */
 484
 485         if (cb != NULL)
 486                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 487         s->in_handshake--;
 488         return(ret);
 489         }
 490
 491 static int ssl3_send_hello_request(SSL *s)
 492         {
 493         unsigned char *p;
 494
 495         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 496                 {
 497                 p=(unsigned char *)s->init_buf->data;
 498                 *(p++)=SSL3_MT_CLIENT_REQUEST;
 499                 *(p++)=0;
 500                 *(p++)=0;
 501                 *(p++)=0;
 502
 503                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 504                 /* number of bytes to write */
 505                 s->init_num=4;
 506                 s->init_off=0;
 507                 }
 508
 509         /* SSL3_ST_SW_HELLO_REQ_B */
 510         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 511         }
 512
 513 static int ssl3_get_client_hello(SSL *s)
 514         {
 515         int i,j,ok,al,ret= -1;
 516         long n;
 517         unsigned long id;
 518         unsigned char *p,*d,*q;
 519         SSL_CIPHER *c;
 520         SSL_COMP *comp=NULL;
 521         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 522
 523         /* We do this so that we will respond with our native type.
 524          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 525          * This down switching should be handled by a different method.
 526          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 527          * TLSv1.
 528          */
 529         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 530                 {
 531                 s->first_packet=1;
 532                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 533                 }
 534         n=ssl3_get_message(s,
 535                 SSL3_ST_SR_CLNT_HELLO_B,
 536                 SSL3_ST_SR_CLNT_HELLO_C,
 537                 SSL3_MT_CLIENT_HELLO,
 538                 SSL3_RT_MAX_PLAIN_LENGTH,
 539                 &ok);
 540
 541         if (!ok) return((int)n);
 542         d=p=(unsigned char *)s->init_buf->data;
 543
 544         /* use version from inside client hello, not from record header
 545          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 546         s->client_version=(((int)p[0])<<8)|(int)p[1];
 547         p+=2;
 548
 549         /* load the client random */
 550         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 551         p+=SSL3_RANDOM_SIZE;
 552
 553         /* get the session-id */
 554         j= *(p++);
 555
 556         s->hit=0;
 557         if (j == 0)
 558                 {
 559                 if (!ssl_get_new_session(s,1))
 560                         goto err;
 561                 }
 562         else
 563                 {
 564                 i=ssl_get_prev_session(s,p,j);
 565                 if (i == 1)
 566                         { /* previous session */
 567                         s->hit=1;
 568                         }
 569                 else if (i == -1)
 570                         goto err;
 571                 else /* i == 0 */
 572                         {
 573                         if (!ssl_get_new_session(s,1))
 574                                 goto err;
 575                         }
 576                 }
 577
 578         p+=j;
 579         n2s(p,i);
 580         if ((i == 0) && (j != 0))
 581                 {
 582                 /* we need a cipher if we are not resuming a session */
 583                 al=SSL_AD_ILLEGAL_PARAMETER;
 584                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 585                 goto f_err;
 586                 }
 587         if ((i+p) > (d+n))
 588                 {
 589                 /* not enough data */
 590                 al=SSL_AD_DECODE_ERROR;
 591                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 592                 goto f_err;
 593                 }
 594         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 595                 == NULL))
 596                 {
 597                 goto err;
 598                 }
 599         p+=i;
 600
 601         /* If it is a hit, check that the cipher is in the list */
 602         if ((s->hit) && (i > 0))
 603                 {
 604                 j=0;
 605                 id=s->session->cipher->id;
 606
 607 #ifdef CIPHER_DEBUG
 608                 printf("client sent %d ciphers\n",sk_num(ciphers));
 609 #endif
 610                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 611                         {
 612                         c=sk_SSL_CIPHER_value(ciphers,i);
 613 #ifdef CIPHER_DEBUG
 614                         printf("client [%2d of %2d]:%s\n",
 615                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 616 #endif
 617                         if (c->id == id)
 618                                 {
 619                                 j=1;
 620                                 break;
 621                                 }
 622                         }
 623                 if (j == 0)
 624                         {
 625                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 626                                 {
 627                                 /* Very bad for multi-threading.... */
 628                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 629                                                                        0);
 630                                 }
 631                         else
 632                                 {
 633                                 /* we need to have the cipher in the cipher
 634                                  * list if we are asked to reuse it */
 635                                 al=SSL_AD_ILLEGAL_PARAMETER;
 636                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 637                                 goto f_err;
 638                                 }
 639                         }
 640                 }
 641
 642         /* compression */
 643         i= *(p++);
 644         q=p;
 645         for (j=0; j<i; j++)
 646                 {
 647                 if (p[j] == 0) break;
 648                 }
 649
 650         p+=i;
 651         if (j >= i)
 652                 {
 653                 /* no compress */
 654                 al=SSL_AD_DECODE_ERROR;
 655                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 656                 goto f_err;
 657                 }
 658
 659         /* Worst case, we will use the NULL compression, but if we have other
 660          * options, we will now look for them.  We have i-1 compression
 661          * algorithms from the client, starting at q. */
 662         s->s3->tmp.new_compression=NULL;
 663         if (s->ctx->comp_methods != NULL)
 664                 { /* See if we have a match */
 665                 int m,nn,o,v,done=0;
 666
 667                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 668                 for (m=0; m<nn; m++)
 669                         {
 670                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 671                         v=comp->id;
 672                         for (o=0; o<i; o++)
 673                                 {
 674                                 if (v == q[o])
 675                                         {
 676                                         done=1;
 677                                         break;
 678                                         }
 679                                 }
 680                         if (done) break;
 681                         }
 682                 if (done)
 683                         s->s3->tmp.new_compression=comp;
 684                 else
 685                         comp=NULL;
 686                 }
 687
 688         /* TLS does not mind if there is extra stuff */
 689         if (s->version == SSL3_VERSION)
 690                 {
 691                 if (p > (d+n))
 692                         {
 693                         /* wrong number of bytes,
 694                          * there could be more to follow */
 695                         al=SSL_AD_DECODE_ERROR;
 696                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 697                         goto f_err;
 698                         }
 699                 }
 700
 701         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 702          * pick a cipher */
 703
 704         if (!s->hit)
 705                 {
 706                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 707                 if (s->session->ciphers != NULL)
 708                         sk_SSL_CIPHER_free(s->session->ciphers);
 709                 s->session->ciphers=ciphers;
 710                 if (ciphers == NULL)
 711                         {
 712                         al=SSL_AD_ILLEGAL_PARAMETER;
 713                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 714                         goto f_err;
 715                         }
 716                 ciphers=NULL;
 717                 c=ssl3_choose_cipher(s,s->session->ciphers,
 718                                      ssl_get_ciphers_by_id(s));
 719
 720                 if (c == NULL)
 721                         {
 722                         al=SSL_AD_HANDSHAKE_FAILURE;
 723                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 724                         goto f_err;
 725                         }
 726                 s->s3->tmp.new_cipher=c;
 727                 }
 728         else
 729                 {
 730                 /* Session-id reuse */
 731 #ifdef REUSE_CIPHER_BUG
 732                 STACK_OF(SSL_CIPHER) *sk;
 733                 SSL_CIPHER *nc=NULL;
 734                 SSL_CIPHER *ec=NULL;
 735
 736                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 737                         {
 738                         sk=s->session->ciphers;
 739                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 740                                 {
 741                                 c=sk_SSL_CIPHER_value(sk,i);
 742                                 if (c->algorithms & SSL_eNULL)
 743                                         nc=c;
 744                                 if (SSL_C_IS_EXPORT(c))
 745                                         ec=c;
 746                                 }
 747                         if (nc != NULL)
 748                                 s->s3->tmp.new_cipher=nc;
 749                         else if (ec != NULL)
 750                                 s->s3->tmp.new_cipher=ec;
 751                         else
 752                                 s->s3->tmp.new_cipher=s->session->cipher;
 753                         }
 754                 else
 755 #endif
 756                 s->s3->tmp.new_cipher=s->session->cipher;
 757                 }
 758
 759         /* we now have the following setup.
 760          * client_random
 761          * cipher_list          - our prefered list of ciphers
 762          * ciphers              - the clients prefered list of ciphers
 763          * compression          - basically ignored right now
 764          * ssl version is set   - sslv3
 765          * s->session           - The ssl session has been setup.
 766          * s->hit               - sesson reuse flag
 767          * s->tmp.new_cipher    - the new cipher to use.
 768          */
 769
 770         ret=1;
 771         if (0)
 772                 {
 773 f_err:
 774                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 775                 }
 776 err:
 777         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 778         return(ret);
 779         }
 780
 781 static int ssl3_send_server_hello(SSL *s)
 782         {
 783         unsigned char *buf;
 784         unsigned char *p,*d;
 785         int i,sl;
 786         unsigned long l,Time;
 787
 788         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 789                 {
 790                 buf=(unsigned char *)s->init_buf->data;
 791                 p=s->s3->server_random;
 792                 Time=time(NULL);                        /* Time */
 793                 l2n(Time,p);
 794                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 795                 /* Do the message type and length last */
 796                 d=p= &(buf[4]);
 797
 798                 *(p++)=s->version>>8;
 799                 *(p++)=s->version&0xff;
 800
 801                 /* Random stuff */
 802                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 803                 p+=SSL3_RANDOM_SIZE;
 804
 805                 /* now in theory we have 3 options to sending back the
 806                  * session id.  If it is a re-use, we send back the
 807                  * old session-id, if it is a new session, we send
 808                  * back the new session-id or we send back a 0 length
 809                  * session-id if we want it to be single use.
 810                  * Currently I will not implement the '0' length session-id
 811                  * 12-Jan-98 - I'll now support the '0' length stuff.
 812                  */
 813                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 814                         s->session->session_id_length=0;
 815
 816                 sl=s->session->session_id_length;
 817                 *(p++)=sl;
 818                 memcpy(p,s->session->session_id,sl);
 819                 p+=sl;
 820
 821                 /* put the cipher */
 822                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 823                 p+=i;
 824
 825                 /* put the compression method */
 826                 if (s->s3->tmp.new_compression == NULL)
 827                         *(p++)=0;
 828                 else
 829                         *(p++)=s->s3->tmp.new_compression->id;
 830
 831                 /* do the header */
 832                 l=(p-d);
 833                 d=buf;
 834                 *(d++)=SSL3_MT_SERVER_HELLO;
 835                 l2n3(l,d);
 836
 837                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 838                 /* number of bytes to write */
 839                 s->init_num=p-buf;
 840                 s->init_off=0;
 841                 }
 842
 843         /* SSL3_ST_CW_CLNT_HELLO_B */
 844         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 845         }
 846
 847 static int ssl3_send_server_done(SSL *s)
 848         {
 849         unsigned char *p;
 850
 851         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 852                 {
 853                 p=(unsigned char *)s->init_buf->data;
 854
 855                 /* do the header */
 856                 *(p++)=SSL3_MT_SERVER_DONE;
 857                 *(p++)=0;
 858                 *(p++)=0;
 859                 *(p++)=0;
 860
 861                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 862                 /* number of bytes to write */
 863                 s->init_num=4;
 864                 s->init_off=0;
 865                 }
 866
 867         /* SSL3_ST_CW_CLNT_HELLO_B */
 868         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 869         }
 870
 871 static int ssl3_send_server_key_exchange(SSL *s)
 872         {
 873 #ifndef NO_RSA
 874         unsigned char *q;
 875         int j,num;
 876         RSA *rsa;
 877         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 878 #endif
 879 #ifndef NO_DH
 880         DH *dh,*dhp;
 881 #endif
 882         EVP_PKEY *pkey;
 883         unsigned char *p,*d;
 884         int al,i;
 885         unsigned int u;
 886         unsigned long type;
 887         int n;
 888         CERT *cert;
 889         BIGNUM *r[4];
 890         int nr[4],kn;
 891         BUF_MEM *buf;
 892         EVP_MD_CTX md_ctx;
 893
 894         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 895                 {
 896                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 897                 cert=s->cert;
 898
 899                 buf=s->init_buf;
 900
 901                 r[0]=r[1]=r[2]=r[3]=NULL;
 902                 n=0;
 903 #ifndef NO_RSA
 904                 if (type & SSL_kRSA)
 905                         {
 906                         rsa=cert->rsa_tmp;
 907                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 908                                 {
 909                                 rsa=s->cert->rsa_tmp_cb(s,
 910                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 911                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 912                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 913                                 cert->rsa_tmp=rsa;
 914                                 }
 915                         if (rsa == NULL)
 916                                 {
 917                                 al=SSL_AD_HANDSHAKE_FAILURE;
 918                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 919                                 goto f_err;
 920                                 }
 921                         r[0]=rsa->n;
 922                         r[1]=rsa->e;
 923                         s->s3->tmp.use_rsa_tmp=1;
 924                         }
 925                 else
 926 #endif
 927 #ifndef NO_DH
 928                         if (type & SSL_kEDH)
 929                         {
 930                         dhp=cert->dh_tmp;
 931                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 932                                 dhp=s->cert->dh_tmp_cb(s,
 933                                       !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 934                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 935                         if (dhp == NULL)
 936                                 {
 937                                 al=SSL_AD_HANDSHAKE_FAILURE;
 938                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 939                                 goto f_err;
 940                                 }
 941                         if ((dh=DHparams_dup(dhp)) == NULL)
 942                                 {
 943                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 944                                 goto err;
 945                                 }
 946
 947                         s->s3->tmp.dh=dh;
 948                         if ((dhp->pub_key == NULL ||
 949                              dhp->priv_key == NULL ||
 950                              (s->options & SSL_OP_SINGLE_DH_USE)))
 951                                 {
 952                                 if(!DH_generate_key(dh))
 953                                     {
 954                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
 955                                            ERR_R_DH_LIB);
 956                                     goto err;
 957                                     }
 958                                 }
 959                         else
 960                                 {
 961                                 dh->pub_key=BN_dup(dhp->pub_key);
 962                                 dh->priv_key=BN_dup(dhp->priv_key);
 963                                 if ((dh->pub_key == NULL) ||
 964                                         (dh->priv_key == NULL))
 965                                         {
 966                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 967                                         goto err;
 968                                         }
 969                                 }
 970                         r[0]=dh->p;
 971                         r[1]=dh->g;
 972                         r[2]=dh->pub_key;
 973                         }
 974                 else
 975 #endif
 976                         {
 977                         al=SSL_AD_HANDSHAKE_FAILURE;
 978                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 979                         goto f_err;
 980                         }
 981                 for (i=0; r[i] != NULL; i++)
 982                         {
 983                         nr[i]=BN_num_bytes(r[i]);
 984                         n+=2+nr[i];
 985                         }
 986
 987                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 988                         {
 989                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 990                                 == NULL)
 991                                 {
 992                                 al=SSL_AD_DECODE_ERROR;
 993                                 goto f_err;
 994                                 }
 995                         kn=EVP_PKEY_size(pkey);
 996                         }
 997                 else
 998                         {
 999                         pkey=NULL;
1000                         kn=0;
1001                         }
1002
1003                 if (!BUF_MEM_grow(buf,n+4+kn))
1004                         {
1005                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1006                         goto err;
1007                         }
1008                 d=(unsigned char *)s->init_buf->data;
1009                 p= &(d[4]);
1010
1011                 for (i=0; r[i] != NULL; i++)
1012                         {
1013                         s2n(nr[i],p);
1014                         BN_bn2bin(r[i],p);
1015                         p+=nr[i];
1016                         }
1017
1018                 /* not anonymous */
1019                 if (pkey != NULL)
1020                         {
1021                         /* n is the length of the params, they start at &(d[4])
1022                          * and p points to the space at the end. */
1023 #ifndef NO_RSA
1024                         if (pkey->type == EVP_PKEY_RSA)
1025                                 {
1026                                 q=md_buf;
1027                                 j=0;
1028                                 for (num=2; num > 0; num--)
1029                                         {
1030                                         EVP_DigestInit(&md_ctx,(num == 2)
1031                                                 ?s->ctx->md5:s->ctx->sha1);
1032                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1033                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1034                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1035                                         EVP_DigestFinal(&md_ctx,q,
1036                                                 (unsigned int *)&i);
1037                                         q+=i;
1038                                         j+=i;
1039                                         }
1040                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1041                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1042                                         {
1043                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1044                                         goto err;
1045                                         }
1046                                 s2n(u,p);
1047                                 n+=u+2;
1048                                 }
1049                         else
1050 #endif
1051 #if !defined(NO_DSA)
1052                                 if (pkey->type == EVP_PKEY_DSA)
1053                                 {
1054                                 /* lets do DSS */
1055                                 EVP_SignInit(&md_ctx,EVP_dss1());
1056                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1057                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1058                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1059                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1060                                         (unsigned int *)&i,pkey))
1061                                         {
1062                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1063                                         goto err;
1064                                         }
1065                                 s2n(i,p);
1066                                 n+=i+2;
1067                                 }
1068                         else
1069 #endif
1070                                 {
1071                                 /* Is this error check actually needed? */
1072                                 al=SSL_AD_HANDSHAKE_FAILURE;
1073                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1074                                 goto f_err;
1075                                 }
1076                         }
1077
1078                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1079                 l2n3(n,d);
1080
1081                 /* we should now have things packed up, so lets send
1082                  * it off */
1083                 s->init_num=n+4;
1084                 s->init_off=0;
1085                 }
1086
1087         /* SSL3_ST_SW_KEY_EXCH_B */
1088         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1089 f_err:
1090         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1091 err:
1092         return(-1);
1093         }
1094
1095 static int ssl3_send_certificate_request(SSL *s)
1096         {
1097         unsigned char *p,*d;
1098         int i,j,nl,off,n;
1099         STACK_OF(X509_NAME) *sk=NULL;
1100         X509_NAME *name;
1101         BUF_MEM *buf;
1102
1103         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1104                 {
1105                 buf=s->init_buf;
1106
1107                 d=p=(unsigned char *)&(buf->data[4]);
1108
1109                 /* get the list of acceptable cert types */
1110                 p++;
1111                 n=ssl3_get_req_cert_type(s,p);
1112                 d[0]=n;
1113                 p+=n;
1114                 n++;
1115
1116                 off=n;
1117                 p+=2;
1118                 n+=2;
1119
1120                 sk=SSL_get_client_CA_list(s);
1121                 nl=0;
1122                 if (sk != NULL)
1123                         {
1124                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1125                                 {
1126                                 name=sk_X509_NAME_value(sk,i);
1127                                 j=i2d_X509_NAME(name,NULL);
1128                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1129                                         {
1130                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1131                                         goto err;
1132                                         }
1133                                 p=(unsigned char *)&(buf->data[4+n]);
1134                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1135                                         {
1136                                         s2n(j,p);
1137                                         i2d_X509_NAME(name,&p);
1138                                         n+=2+j;
1139                                         nl+=2+j;
1140                                         }
1141                                 else
1142                                         {
1143                                         d=p;
1144                                         i2d_X509_NAME(name,&p);
1145                                         j-=2; s2n(j,d); j+=2;
1146                                         n+=j;
1147                                         nl+=j;
1148                                         }
1149                                 }
1150                         }
1151                 /* else no CA names */
1152                 p=(unsigned char *)&(buf->data[4+off]);
1153                 s2n(nl,p);
1154
1155                 d=(unsigned char *)buf->data;
1156                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1157                 l2n3(n,d);
1158
1159                 /* we should now have things packed up, so lets send
1160                  * it off */
1161
1162                 s->init_num=n+4;
1163                 s->init_off=0;
1164                 }
1165
1166         /* SSL3_ST_SW_CERT_REQ_B */
1167         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1168 err:
1169         return(-1);
1170         }
1171
1172 static int ssl3_get_client_key_exchange(SSL *s)
1173         {
1174         int i,al,ok;
1175         long n;
1176         unsigned long l;
1177         unsigned char *p;
1178 #ifndef NO_RSA
1179         RSA *rsa=NULL;
1180         EVP_PKEY *pkey=NULL;
1181 #endif
1182 #ifndef NO_DH
1183         BIGNUM *pub=NULL;
1184         DH *dh_srvr;
1185 #endif
1186
1187         n=ssl3_get_message(s,
1188                 SSL3_ST_SR_KEY_EXCH_A,
1189                 SSL3_ST_SR_KEY_EXCH_B,
1190                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1191                 400, /* ???? */
1192                 &ok);
1193
1194         if (!ok) return((int)n);
1195         p=(unsigned char *)s->init_buf->data;
1196
1197         l=s->s3->tmp.new_cipher->algorithms;
1198
1199 #ifndef NO_RSA
1200         if (l & SSL_kRSA)
1201                 {
1202                 /* FIX THIS UP EAY EAY EAY EAY */
1203                 if (s->s3->tmp.use_rsa_tmp)
1204                         {
1205                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1206                                 rsa=s->cert->rsa_tmp;
1207                         /* Don't do a callback because rsa_tmp should
1208                          * be sent already */
1209                         if (rsa == NULL)
1210                                 {
1211                                 al=SSL_AD_HANDSHAKE_FAILURE;
1212                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1213                                 goto f_err;
1214
1215                                 }
1216                         }
1217                 else
1218                         {
1219                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1220                         if (    (pkey == NULL) ||
1221                                 (pkey->type != EVP_PKEY_RSA) ||
1222                                 (pkey->pkey.rsa == NULL))
1223                                 {
1224                                 al=SSL_AD_HANDSHAKE_FAILURE;
1225                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1226                                 goto f_err;
1227                                 }
1228                         rsa=pkey->pkey.rsa;
1229                         }
1230
1231                 /* TLS */
1232                 if (s->version > SSL3_VERSION)
1233                         {
1234                         n2s(p,i);
1235                         if (n != i+2)
1236                                 {
1237                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1238                                         {
1239                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1240                                         goto err;
1241                                         }
1242                                 else
1243                                         p-=2;
1244                                 }
1245                         else
1246                                 n=i;
1247                         }
1248
1249                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1250
1251 #if 0
1252                 /* If a bad decrypt, use a random master key */
1253                 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1254                         ((p[0] != (s->client_version>>8)) ||
1255                          (p[1] != (s->client_version & 0xff))))
1256                         {
1257                         int bad=1;
1258
1259                         if ((i == SSL_MAX_MASTER_KEY_LENGTH) &&
1260                                 (p[0] == (s->version>>8)) &&
1261                                 (p[1] == 0))
1262                                 {
1263                                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
1264                                         bad=0;
1265                                 }
1266                         if (bad)
1267                                 {
1268                                 p[0]=(s->version>>8);
1269                                 p[1]=(s->version & 0xff);
1270                                 RAND_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1271                                 i=SSL_MAX_MASTER_KEY_LENGTH;
1272                                 }
1273                         /* else, an SSLeay bug, ssl only server, tls client */
1274                         }
1275 #else
1276                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1277                         {
1278                         al=SSL_AD_DECODE_ERROR;
1279                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1280                         goto f_err;
1281                         }
1282
1283                 if ((p[0] != (s->client_version>>8)) || (p[1] != (s->client_version & 0xff)))
1284                         {
1285                         al=SSL_AD_DECODE_ERROR;
1286                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1287                         goto f_err;
1288                         }
1289 #endif
1290
1291                 s->session->master_key_length=
1292                         s->method->ssl3_enc->generate_master_secret(s,
1293                                 s->session->master_key,
1294                                 p,i);
1295                 memset(p,0,i);
1296                 }
1297         else
1298 #endif
1299 #ifndef NO_DH
1300                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1301                 {
1302                 n2s(p,i);
1303                 if (n != i+2)
1304                         {
1305                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1306                                 {
1307                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1308                                 goto err;
1309                                 }
1310                         else
1311                                 {
1312                                 p-=2;
1313                                 i=(int)n;
1314                                 }
1315                         }
1316
1317                 if (n == 0L) /* the parameters are in the cert */
1318                         {
1319                         al=SSL_AD_HANDSHAKE_FAILURE;
1320                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1321                         goto f_err;
1322                         }
1323                 else
1324                         {
1325                         if (s->s3->tmp.dh == NULL)
1326                                 {
1327                                 al=SSL_AD_HANDSHAKE_FAILURE;
1328                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1329                                 goto f_err;
1330                                 }
1331                         else
1332                                 dh_srvr=s->s3->tmp.dh;
1333                         }
1334
1335                 pub=BN_bin2bn(p,i,NULL);
1336                 if (pub == NULL)
1337                         {
1338                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1339                         goto err;
1340                         }
1341
1342                 i=DH_compute_key(p,pub,dh_srvr);
1343
1344                 if (i <= 0)
1345                         {
1346                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1347                         goto err;
1348                         }
1349
1350                 DH_free(s->s3->tmp.dh);
1351                 s->s3->tmp.dh=NULL;
1352
1353                 BN_clear_free(pub);
1354                 pub=NULL;
1355                 s->session->master_key_length=
1356                         s->method->ssl3_enc->generate_master_secret(s,
1357                                 s->session->master_key,p,i);
1358                 }
1359         else
1360 #endif
1361                 {
1362                 al=SSL_AD_HANDSHAKE_FAILURE;
1363                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1364                 goto f_err;
1365                 }
1366
1367         return(1);
1368 f_err:
1369         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1370 #if !defined(NO_DH) || !defined(NO_RSA)
1371 err:
1372 #endif
1373         return(-1);
1374         }
1375
1376 static int ssl3_get_cert_verify(SSL *s)
1377         {
1378         EVP_PKEY *pkey=NULL;
1379         unsigned char *p;
1380         int al,ok,ret=0;
1381         long n;
1382         int type=0,i,j;
1383         X509 *peer;
1384
1385         n=ssl3_get_message(s,
1386                 SSL3_ST_SR_CERT_VRFY_A,
1387                 SSL3_ST_SR_CERT_VRFY_B,
1388                 -1,
1389                 512, /* 512? */
1390                 &ok);
1391
1392         if (!ok) return((int)n);
1393
1394         if (s->session->peer != NULL)
1395                 {
1396                 peer=s->session->peer;
1397                 pkey=X509_get_pubkey(peer);
1398                 type=X509_certificate_type(peer,pkey);
1399                 }
1400         else
1401                 {
1402                 peer=NULL;
1403                 pkey=NULL;
1404                 }
1405
1406         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1407                 {
1408                 s->s3->tmp.reuse_message=1;
1409                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1410                         {
1411                         al=SSL_AD_UNEXPECTED_MESSAGE;
1412                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1413                         goto f_err;
1414                         }
1415                 ret=1;
1416                 goto end;
1417                 }
1418
1419         if (peer == NULL)
1420                 {
1421                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1422                 al=SSL_AD_UNEXPECTED_MESSAGE;
1423                 goto f_err;
1424                 }
1425
1426         if (!(type & EVP_PKT_SIGN))
1427                 {
1428                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1429                 al=SSL_AD_ILLEGAL_PARAMETER;
1430                 goto f_err;
1431                 }
1432
1433         if (s->s3->change_cipher_spec)
1434                 {
1435                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1436                 al=SSL_AD_UNEXPECTED_MESSAGE;
1437                 goto f_err;
1438                 }
1439
1440         /* we now have a signature that we need to verify */
1441         p=(unsigned char *)s->init_buf->data;
1442         n2s(p,i);
1443         n-=2;
1444         if (i > n)
1445                 {
1446                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1447                 al=SSL_AD_DECODE_ERROR;
1448                 goto f_err;
1449                 }
1450
1451         j=EVP_PKEY_size(pkey);
1452         if ((i > j) || (n > j) || (n <= 0))
1453                 {
1454                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1455                 al=SSL_AD_DECODE_ERROR;
1456                 goto f_err;
1457                 }
1458
1459 #ifndef NO_RSA
1460         if (pkey->type == EVP_PKEY_RSA)
1461                 {
1462                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.finish_md,
1463                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1464                                                         pkey->pkey.rsa);
1465                 if (i < 0)
1466                         {
1467                         al=SSL_AD_DECRYPT_ERROR;
1468                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1469                         goto f_err;
1470                         }
1471                 if (i == 0)
1472                         {
1473                         al=SSL_AD_DECRYPT_ERROR;
1474                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1475                         goto f_err;
1476                         }
1477                 }
1478         else
1479 #endif
1480 #ifndef NO_DSA
1481                 if (pkey->type == EVP_PKEY_DSA)
1482                 {
1483                 j=DSA_verify(pkey->save_type,
1484                         &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]),
1485                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1486                 if (j <= 0)
1487                         {
1488                         /* bad signature */
1489                         al=SSL_AD_DECRYPT_ERROR;
1490                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1491                         goto f_err;
1492                         }
1493                 }
1494         else
1495 #endif
1496                 {
1497                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1498                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1499                 goto f_err;
1500                 }
1501
1502
1503         ret=1;
1504         if (0)
1505                 {
1506 f_err:
1507                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1508                 }
1509 end:
1510         EVP_PKEY_free(pkey);
1511         return(ret);
1512         }
1513
1514 static int ssl3_get_client_certificate(SSL *s)
1515         {
1516         int i,ok,al,ret= -1;
1517         X509 *x=NULL;
1518         unsigned long l,nc,llen,n;
1519         unsigned char *p,*d,*q;
1520         STACK_OF(X509) *sk=NULL;
1521
1522         n=ssl3_get_message(s,
1523                 SSL3_ST_SR_CERT_A,
1524                 SSL3_ST_SR_CERT_B,
1525                 -1,
1526 #if defined(MSDOS) && !defined(WIN32)
1527                 1024*30, /* 30k max cert list :-) */
1528 #else
1529                 1024*100, /* 100k max cert list :-) */
1530 #endif
1531                 &ok);
1532
1533         if (!ok) return((int)n);
1534
1535         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1536                 {
1537                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1538                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1539                         {
1540                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1541                         al=SSL_AD_HANDSHAKE_FAILURE;
1542                         goto f_err;
1543                         }
1544                 /* If tls asked for a client cert, the client must return a 0 list */
1545                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1546                         {
1547                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1548                         al=SSL_AD_UNEXPECTED_MESSAGE;
1549                         goto f_err;
1550                         }
1551                 s->s3->tmp.reuse_message=1;
1552                 return(1);
1553                 }
1554
1555         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1556                 {
1557                 al=SSL_AD_UNEXPECTED_MESSAGE;
1558                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1559                 goto f_err;
1560                 }
1561         d=p=(unsigned char *)s->init_buf->data;
1562
1563         if ((sk=sk_X509_new_null()) == NULL)
1564                 {
1565                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1566                 goto err;
1567                 }
1568
1569         n2l3(p,llen);
1570         if (llen+3 != n)
1571                 {
1572                 al=SSL_AD_DECODE_ERROR;
1573                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1574                 goto f_err;
1575                 }
1576         for (nc=0; nc<llen; )
1577                 {
1578                 n2l3(p,l);
1579                 if ((l+nc+3) > llen)
1580                         {
1581                         al=SSL_AD_DECODE_ERROR;
1582                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1583                         goto f_err;
1584                         }
1585
1586                 q=p;
1587                 x=d2i_X509(NULL,&p,l);
1588                 if (x == NULL)
1589                         {
1590                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1591                         goto err;
1592                         }
1593                 if (p != (q+l))
1594                         {
1595                         al=SSL_AD_DECODE_ERROR;
1596                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1597                         goto f_err;
1598                         }
1599                 if (!sk_X509_push(sk,x))
1600                         {
1601                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1602                         goto err;
1603                         }
1604                 x=NULL;
1605                 nc+=l+3;
1606                 }
1607
1608         if (sk_X509_num(sk) <= 0)
1609                 {
1610                 /* TLS does not mind 0 certs returned */
1611                 if (s->version == SSL3_VERSION)
1612                         {
1613                         al=SSL_AD_HANDSHAKE_FAILURE;
1614                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1615                         goto f_err;
1616                         }
1617                 /* Fail for TLS only if we required a certificate */
1618                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1619                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1620                         {
1621                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1622                         al=SSL_AD_HANDSHAKE_FAILURE;
1623                         goto f_err;
1624                         }
1625                 }
1626         else
1627                 {
1628                 i=ssl_verify_cert_chain(s,sk);
1629                 if (!i)
1630                         {
1631                         al=ssl_verify_alarm_type(s->verify_result);
1632                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1633                         goto f_err;
1634                         }
1635                 }
1636
1637         if (s->session->peer != NULL) /* This should not be needed */
1638                 X509_free(s->session->peer);
1639         s->session->peer=sk_X509_shift(sk);
1640         s->session->verify_result = s->verify_result;
1641
1642         /* With the current implementation, sess_cert will always be NULL
1643          * when we arrive here. */
1644         if (s->session->sess_cert == NULL)
1645                 {
1646                 s->session->sess_cert = ssl_sess_cert_new();
1647                 if (s->session->sess_cert == NULL)
1648                         {
1649                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1650                         goto err;
1651                         }
1652                 }
1653         if (s->session->sess_cert->cert_chain != NULL)
1654                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1655         s->session->sess_cert->cert_chain=sk;
1656
1657         sk=NULL;
1658
1659         ret=1;
1660         if (0)
1661                 {
1662 f_err:
1663                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1664                 }
1665 err:
1666         if (x != NULL) X509_free(x);
1667         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1668         return(ret);
1669         }
1670
1671 int ssl3_send_server_certificate(SSL *s)
1672         {
1673         unsigned long l;
1674         X509 *x;
1675
1676         if (s->state == SSL3_ST_SW_CERT_A)
1677                 {
1678                 x=ssl_get_server_send_cert(s);
1679                 if (x == NULL)
1680                         {
1681                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1682                         return(0);
1683                         }
1684
1685                 l=ssl3_output_cert_chain(s,x);
1686                 s->state=SSL3_ST_SW_CERT_B;
1687                 s->init_num=(int)l;
1688                 s->init_off=0;
1689                 }
1690
1691         /* SSL3_ST_SW_CERT_B */
1692         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1693         }