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_cert_verify(SSL *s);
  81 static int ssl3_get_client_key_exchange(SSL *s);
  82 static int ssl3_get_client_certificate(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 SSL3_ST_SR_MS_SGC:
 148                 case SSL_ST_BEFORE:
 149                 case SSL_ST_ACCEPT:
 150                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 151                 case SSL_ST_OK|SSL_ST_ACCEPT:
 152
 153                         s->server=1;
 154                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 155
 156                         if ((s->version>>8) != 3)
 157                                 abort();
 158                         /* s->version=SSL3_VERSION; */
 159                         s->type=SSL_ST_ACCEPT;
 160
 161                         if (s->init_buf == NULL)
 162                                 {
 163                                 if ((buf=BUF_MEM_new()) == NULL)
 164                                         {
 165                                         ret= -1;
 166                                         goto end;
 167                                         }
 168                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 169                                         {
 170                                         ret= -1;
 171                                         goto end;
 172                                         }
 173                                 s->init_buf=buf;
 174                                 }
 175
 176                         if (!ssl3_setup_buffers(s))
 177                                 {
 178                                 ret= -1;
 179                                 goto end;
 180                                 }
 181
 182                         /* Ok, we now need to push on a buffering BIO so that
 183                          * the output is sent in a way that TCP likes :-)
 184                          */
 185                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 186
 187                         s->init_num=0;
 188
 189                         if (s->state != SSL_ST_RENEGOTIATE)
 190                                 {
 191                                 if(s->state != SSL3_ST_SR_MS_SGC) ssl3_init_finished_mac(s);
 192                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 193                                 s->ctx->stats.sess_accept++;
 194                                 }
 195                         else
 196                                 {
 197                                 s->ctx->stats.sess_accept_renegotiate++;
 198                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 199                                 }
 200                         break;
 201
 202                 case SSL3_ST_SW_HELLO_REQ_A:
 203                 case SSL3_ST_SW_HELLO_REQ_B:
 204
 205                         s->shutdown=0;
 206                         ret=ssl3_send_hello_request(s);
 207                         if (ret <= 0) goto end;
 208                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 209                         s->state=SSL3_ST_SW_FLUSH;
 210                         s->init_num=0;
 211
 212                         ssl3_init_finished_mac(s);
 213                         break;
 214
 215                 case SSL3_ST_SW_HELLO_REQ_C:
 216                         s->state=SSL_ST_OK;
 217                         ret=1;
 218                         goto end;
 219                         /* break; */
 220
 221                 case SSL3_ST_SR_CLNT_HELLO_A:
 222                 case SSL3_ST_SR_CLNT_HELLO_B:
 223                 case SSL3_ST_SR_CLNT_HELLO_C:
 224
 225                         s->shutdown=0;
 226                         ret=ssl3_get_client_hello(s);
 227                         if (ret <= 0) goto end;
 228                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 229                         s->init_num=0;
 230                         break;
 231
 232                 case SSL3_ST_SW_SRVR_HELLO_A:
 233                 case SSL3_ST_SW_SRVR_HELLO_B:
 234                         ret=ssl3_send_server_hello(s);
 235                         if (ret <= 0) goto end;
 236
 237                         if (s->hit)
 238                                 s->state=SSL3_ST_SW_CHANGE_A;
 239                         else
 240                                 s->state=SSL3_ST_SW_CERT_A;
 241                         s->init_num=0;
 242                         break;
 243
 244                 case SSL3_ST_SW_CERT_A:
 245                 case SSL3_ST_SW_CERT_B:
 246                         /* Check if it is anon DH */
 247                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 248                                 {
 249                                 ret=ssl3_send_server_certificate(s);
 250                                 if (ret <= 0) goto end;
 251                                 }
 252                         else
 253                                 skip=1;
 254                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 255                         s->init_num=0;
 256                         break;
 257
 258                 case SSL3_ST_SW_KEY_EXCH_A:
 259                 case SSL3_ST_SW_KEY_EXCH_B:
 260                         l=s->s3->tmp.new_cipher->algorithms;
 261
 262                         /* clear this, it may get reset by
 263                          * send_server_key_exchange */
 264                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 265                                 s->s3->tmp.use_rsa_tmp=1;
 266                         else
 267                                 s->s3->tmp.use_rsa_tmp=0;
 268
 269                         /* only send if a DH key exchange, fortezza or
 270                          * RSA but we have a sign only certificate */
 271                         if (s->s3->tmp.use_rsa_tmp
 272                             || (l & (SSL_DH|SSL_kFZA))
 273                             || ((l & SSL_kRSA)
 274                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 275                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 276                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 277                                         )
 278                                     )
 279                                 )
 280                             )
 281                                 {
 282                                 ret=ssl3_send_server_key_exchange(s);
 283                                 if (ret <= 0) goto end;
 284                                 }
 285                         else
 286                                 skip=1;
 287
 288                         s->state=SSL3_ST_SW_CERT_REQ_A;
 289                         s->init_num=0;
 290                         break;
 291
 292                 case SSL3_ST_SW_CERT_REQ_A:
 293                 case SSL3_ST_SW_CERT_REQ_B:
 294                         if (/* don't request cert unless asked for it: */
 295                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 296                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 297                                  * don't request cert during re-negotiation: */
 298                                 ((s->session->peer != NULL) &&
 299                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 300                                 /* never request cert in anonymous ciphersuites
 301                                  * (see section "Certificate request" in SSL 3 drafts
 302                                  * and in RFC 2246): */
 303                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 304                                  /* ... except when the application insists on verification
 305                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 306                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
 307                                 {
 308                                 /* no cert request */
 309                                 skip=1;
 310                                 s->s3->tmp.cert_request=0;
 311                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 312                                 }
 313                         else
 314                                 {
 315                                 s->s3->tmp.cert_request=1;
 316                                 ret=ssl3_send_certificate_request(s);
 317                                 if (ret <= 0) goto end;
 318 #ifndef NETSCAPE_HANG_BUG
 319                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 320 #else
 321                                 s->state=SSL3_ST_SW_FLUSH;
 322                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 323 #endif
 324                                 s->init_num=0;
 325                                 }
 326                         break;
 327
 328                 case SSL3_ST_SW_SRVR_DONE_A:
 329                 case SSL3_ST_SW_SRVR_DONE_B:
 330                         ret=ssl3_send_server_done(s);
 331                         if (ret <= 0) goto end;
 332                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 333                         s->state=SSL3_ST_SW_FLUSH;
 334                         s->init_num=0;
 335                         break;
 336
 337                 case SSL3_ST_SW_FLUSH:
 338                         /* number of bytes to be flushed */
 339                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 340                         if (num1 > 0)
 341                                 {
 342                                 s->rwstate=SSL_WRITING;
 343                                 num1=BIO_flush(s->wbio);
 344                                 if (num1 <= 0) { ret= -1; goto end; }
 345                                 s->rwstate=SSL_NOTHING;
 346                                 }
 347
 348                         s->state=s->s3->tmp.next_state;
 349                         break;
 350
 351                 case SSL3_ST_SR_CERT_A:
 352                 case SSL3_ST_SR_CERT_B:
 353                         /* Check for second client hello if MS SGC */
 354                         ret = ssl3_check_client_hello(s);
 355                         if(ret <= 0) goto end;
 356                         if(ret == 2) s->state = SSL3_ST_SR_MS_SGC;
 357                         else {
 358                                 /* could be sent for a DH cert, even if we
 359                                  * have not asked for it :-) */
 360                                 ret=ssl3_get_client_certificate(s);
 361                                 if (ret <= 0) goto end;
 362                                 s->init_num=0;
 363                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 364                         }
 365                         break;
 366
 367                 case SSL3_ST_SR_KEY_EXCH_A:
 368                 case SSL3_ST_SR_KEY_EXCH_B:
 369                         ret=ssl3_get_client_key_exchange(s);
 370                         if (ret <= 0) goto end;
 371                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 372                         s->init_num=0;
 373
 374                         /* We need to get hashes here so if there is
 375                          * a client cert, it can be verified */
 376                         s->method->ssl3_enc->cert_verify_mac(s,
 377                                 &(s->s3->finish_dgst1),
 378                                 &(s->s3->tmp.cert_verify_md[0]));
 379                         s->method->ssl3_enc->cert_verify_mac(s,
 380                                 &(s->s3->finish_dgst2),
 381                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 382
 383                         break;
 384
 385                 case SSL3_ST_SR_CERT_VRFY_A:
 386                 case SSL3_ST_SR_CERT_VRFY_B:
 387
 388                         /* we should decide if we expected this one */
 389                         ret=ssl3_get_cert_verify(s);
 390                         if (ret <= 0) goto end;
 391
 392                         s->state=SSL3_ST_SR_FINISHED_A;
 393                         s->init_num=0;
 394                         break;
 395
 396                 case SSL3_ST_SR_FINISHED_A:
 397                 case SSL3_ST_SR_FINISHED_B:
 398                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 399                                 SSL3_ST_SR_FINISHED_B);
 400                         if (ret <= 0) goto end;
 401                         if (s->hit)
 402                                 s->state=SSL_ST_OK;
 403                         else
 404                                 s->state=SSL3_ST_SW_CHANGE_A;
 405                         s->init_num=0;
 406                         break;
 407
 408                 case SSL3_ST_SW_CHANGE_A:
 409                 case SSL3_ST_SW_CHANGE_B:
 410
 411                         s->session->cipher=s->s3->tmp.new_cipher;
 412                         if (!s->method->ssl3_enc->setup_key_block(s))
 413                                 { ret= -1; goto end; }
 414
 415                         ret=ssl3_send_change_cipher_spec(s,
 416                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 417
 418                         if (ret <= 0) goto end;
 419                         s->state=SSL3_ST_SW_FINISHED_A;
 420                         s->init_num=0;
 421
 422                         if (!s->method->ssl3_enc->change_cipher_state(s,
 423                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 424                                 {
 425                                 ret= -1;
 426                                 goto end;
 427                                 }
 428
 429                         break;
 430
 431                 case SSL3_ST_SW_FINISHED_A:
 432                 case SSL3_ST_SW_FINISHED_B:
 433                         ret=ssl3_send_finished(s,
 434                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 435                                 s->method->ssl3_enc->server_finished_label,
 436                                 s->method->ssl3_enc->server_finished_label_len);
 437                         if (ret <= 0) goto end;
 438                         s->state=SSL3_ST_SW_FLUSH;
 439                         if (s->hit)
 440                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 441                         else
 442                                 s->s3->tmp.next_state=SSL_ST_OK;
 443                         s->init_num=0;
 444                         break;
 445
 446                 case SSL_ST_OK:
 447                         /* clean a few things up */
 448                         ssl3_cleanup_key_block(s);
 449
 450                         BUF_MEM_free(s->init_buf);
 451                         s->init_buf=NULL;
 452
 453                         /* remove buffering on output */
 454                         ssl_free_wbio_buffer(s);
 455
 456                         s->new_session=0;
 457                         s->init_num=0;
 458
 459                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 460
 461                         s->ctx->stats.sess_accept_good++;
 462                         /* s->server=1; */
 463                         s->handshake_func=ssl3_accept;
 464                         ret=1;
 465
 466                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 467
 468                         goto end;
 469                         /* break; */
 470
 471                 default:
 472                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 473                         ret= -1;
 474                         goto end;
 475                         /* break; */
 476                         }
 477
 478                 if (!s->s3->tmp.reuse_message && !skip)
 479                         {
 480                         if (s->debug)
 481                                 {
 482                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 483                                         goto end;
 484                                 }
 485
 486
 487                         if ((cb != NULL) && (s->state != state))
 488                                 {
 489                                 new_state=s->state;
 490                                 s->state=state;
 491                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 492                                 s->state=new_state;
 493                                 }
 494                         }
 495                 skip=0;
 496                 }
 497 end:
 498         /* BIO_flush(s->wbio); */
 499
 500         if (cb != NULL)
 501                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 502         s->in_handshake--;
 503         return(ret);
 504         }
 505
 506 static int ssl3_send_hello_request(SSL *s)
 507         {
 508         unsigned char *p;
 509
 510         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 511                 {
 512                 p=(unsigned char *)s->init_buf->data;
 513                 *(p++)=SSL3_MT_HELLO_REQUEST;
 514                 *(p++)=0;
 515                 *(p++)=0;
 516                 *(p++)=0;
 517
 518                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 519                 /* number of bytes to write */
 520                 s->init_num=4;
 521                 s->init_off=0;
 522                 }
 523
 524         /* SSL3_ST_SW_HELLO_REQ_B */
 525         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 526         }
 527
 528 static int ssl3_check_client_hello(SSL *s)
 529         {
 530         int ok;
 531         long n;
 532
 533         n=ssl3_get_message(s,
 534                 SSL3_ST_SR_CERT_A,
 535                 SSL3_ST_SR_CERT_B,
 536                 -1,
 537                 SSL3_RT_MAX_PLAIN_LENGTH,
 538                 &ok);
 539         if (!ok) return((int)n);
 540         s->s3->tmp.reuse_message = 1;
 541         if(s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO) return 2;
 542         return 1;
 543 }
 544
 545 static int ssl3_get_client_hello(SSL *s)
 546         {
 547         int i,j,ok,al,ret= -1;
 548         long n;
 549         unsigned long id;
 550         unsigned char *p,*d,*q;
 551         SSL_CIPHER *c;
 552         SSL_COMP *comp=NULL;
 553         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 554
 555         /* We do this so that we will respond with our native type.
 556          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 557          * This down switching should be handled by a different method.
 558          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 559          * TLSv1.
 560          */
 561         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 562                 {
 563                 s->first_packet=1;
 564                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 565                 }
 566         n=ssl3_get_message(s,
 567                 SSL3_ST_SR_CLNT_HELLO_B,
 568                 SSL3_ST_SR_CLNT_HELLO_C,
 569                 SSL3_MT_CLIENT_HELLO,
 570                 SSL3_RT_MAX_PLAIN_LENGTH,
 571                 &ok);
 572
 573         if (!ok) return((int)n);
 574         d=p=(unsigned char *)s->init_buf->data;
 575
 576         /* use version from inside client hello, not from record header
 577          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 578         s->client_version=(((int)p[0])<<8)|(int)p[1];
 579         p+=2;
 580
 581         /* load the client random */
 582         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 583         p+=SSL3_RANDOM_SIZE;
 584
 585         /* get the session-id */
 586         j= *(p++);
 587
 588         s->hit=0;
 589         if (j == 0)
 590                 {
 591                 if (!ssl_get_new_session(s,1))
 592                         goto err;
 593                 }
 594         else
 595                 {
 596                 i=ssl_get_prev_session(s,p,j);
 597                 if (i == 1)
 598                         { /* previous session */
 599                         s->hit=1;
 600                         }
 601                 else if (i == -1)
 602                         goto err;
 603                 else /* i == 0 */
 604                         {
 605                         if (!ssl_get_new_session(s,1))
 606                                 goto err;
 607                         }
 608                 }
 609
 610         p+=j;
 611         n2s(p,i);
 612         if ((i == 0) && (j != 0))
 613                 {
 614                 /* we need a cipher if we are not resuming a session */
 615                 al=SSL_AD_ILLEGAL_PARAMETER;
 616                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 617                 goto f_err;
 618                 }
 619         if ((i+p) > (d+n))
 620                 {
 621                 /* not enough data */
 622                 al=SSL_AD_DECODE_ERROR;
 623                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 624                 goto f_err;
 625                 }
 626         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 627                 == NULL))
 628                 {
 629                 goto err;
 630                 }
 631         p+=i;
 632
 633         /* If it is a hit, check that the cipher is in the list */
 634         if ((s->hit) && (i > 0))
 635                 {
 636                 j=0;
 637                 id=s->session->cipher->id;
 638
 639 #ifdef CIPHER_DEBUG
 640                 printf("client sent %d ciphers\n",sk_num(ciphers));
 641 #endif
 642                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 643                         {
 644                         c=sk_SSL_CIPHER_value(ciphers,i);
 645 #ifdef CIPHER_DEBUG
 646                         printf("client [%2d of %2d]:%s\n",
 647                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 648 #endif
 649                         if (c->id == id)
 650                                 {
 651                                 j=1;
 652                                 break;
 653                                 }
 654                         }
 655                 if (j == 0)
 656                         {
 657                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 658                                 {
 659                                 /* Very bad for multi-threading.... */
 660                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 661                                                                        0);
 662                                 }
 663                         else
 664                                 {
 665                                 /* we need to have the cipher in the cipher
 666                                  * list if we are asked to reuse it */
 667                                 al=SSL_AD_ILLEGAL_PARAMETER;
 668                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 669                                 goto f_err;
 670                                 }
 671                         }
 672                 }
 673
 674         /* compression */
 675         i= *(p++);
 676         q=p;
 677         for (j=0; j<i; j++)
 678                 {
 679                 if (p[j] == 0) break;
 680                 }
 681
 682         p+=i;
 683         if (j >= i)
 684                 {
 685                 /* no compress */
 686                 al=SSL_AD_DECODE_ERROR;
 687                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 688                 goto f_err;
 689                 }
 690
 691         /* Worst case, we will use the NULL compression, but if we have other
 692          * options, we will now look for them.  We have i-1 compression
 693          * algorithms from the client, starting at q. */
 694         s->s3->tmp.new_compression=NULL;
 695         if (s->ctx->comp_methods != NULL)
 696                 { /* See if we have a match */
 697                 int m,nn,o,v,done=0;
 698
 699                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 700                 for (m=0; m<nn; m++)
 701                         {
 702                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 703                         v=comp->id;
 704                         for (o=0; o<i; o++)
 705                                 {
 706                                 if (v == q[o])
 707                                         {
 708                                         done=1;
 709                                         break;
 710                                         }
 711                                 }
 712                         if (done) break;
 713                         }
 714                 if (done)
 715                         s->s3->tmp.new_compression=comp;
 716                 else
 717                         comp=NULL;
 718                 }
 719
 720         /* TLS does not mind if there is extra stuff */
 721         if (s->version == SSL3_VERSION)
 722                 {
 723                 if (p > (d+n))
 724                         {
 725                         /* wrong number of bytes,
 726                          * there could be more to follow */
 727                         al=SSL_AD_DECODE_ERROR;
 728                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 729                         goto f_err;
 730                         }
 731                 }
 732
 733         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 734          * pick a cipher */
 735
 736         if (!s->hit)
 737                 {
 738                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 739                 if (s->session->ciphers != NULL)
 740                         sk_SSL_CIPHER_free(s->session->ciphers);
 741                 s->session->ciphers=ciphers;
 742                 if (ciphers == NULL)
 743                         {
 744                         al=SSL_AD_ILLEGAL_PARAMETER;
 745                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 746                         goto f_err;
 747                         }
 748                 ciphers=NULL;
 749                 c=ssl3_choose_cipher(s,s->session->ciphers,
 750                                      ssl_get_ciphers_by_id(s));
 751
 752                 if (c == NULL)
 753                         {
 754                         al=SSL_AD_HANDSHAKE_FAILURE;
 755                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 756                         goto f_err;
 757                         }
 758                 s->s3->tmp.new_cipher=c;
 759                 }
 760         else
 761                 {
 762                 /* Session-id reuse */
 763 #ifdef REUSE_CIPHER_BUG
 764                 STACK_OF(SSL_CIPHER) *sk;
 765                 SSL_CIPHER *nc=NULL;
 766                 SSL_CIPHER *ec=NULL;
 767
 768                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 769                         {
 770                         sk=s->session->ciphers;
 771                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 772                                 {
 773                                 c=sk_SSL_CIPHER_value(sk,i);
 774                                 if (c->algorithms & SSL_eNULL)
 775                                         nc=c;
 776                                 if (SSL_C_IS_EXPORT(c))
 777                                         ec=c;
 778                                 }
 779                         if (nc != NULL)
 780                                 s->s3->tmp.new_cipher=nc;
 781                         else if (ec != NULL)
 782                                 s->s3->tmp.new_cipher=ec;
 783                         else
 784                                 s->s3->tmp.new_cipher=s->session->cipher;
 785                         }
 786                 else
 787 #endif
 788                 s->s3->tmp.new_cipher=s->session->cipher;
 789                 }
 790
 791         /* we now have the following setup.
 792          * client_random
 793          * cipher_list          - our prefered list of ciphers
 794          * ciphers              - the clients prefered list of ciphers
 795          * compression          - basically ignored right now
 796          * ssl version is set   - sslv3
 797          * s->session           - The ssl session has been setup.
 798          * s->hit               - session reuse flag
 799          * s->tmp.new_cipher    - the new cipher to use.
 800          */
 801
 802         ret=1;
 803         if (0)
 804                 {
 805 f_err:
 806                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 807                 }
 808 err:
 809         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 810         return(ret);
 811         }
 812
 813 static int ssl3_send_server_hello(SSL *s)
 814         {
 815         unsigned char *buf;
 816         unsigned char *p,*d;
 817         int i,sl;
 818         unsigned long l,Time;
 819
 820         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 821                 {
 822                 buf=(unsigned char *)s->init_buf->data;
 823                 p=s->s3->server_random;
 824                 Time=time(NULL);                        /* Time */
 825                 l2n(Time,p);
 826                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 827                 /* Do the message type and length last */
 828                 d=p= &(buf[4]);
 829
 830                 *(p++)=s->version>>8;
 831                 *(p++)=s->version&0xff;
 832
 833                 /* Random stuff */
 834                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 835                 p+=SSL3_RANDOM_SIZE;
 836
 837                 /* now in theory we have 3 options to sending back the
 838                  * session id.  If it is a re-use, we send back the
 839                  * old session-id, if it is a new session, we send
 840                  * back the new session-id or we send back a 0 length
 841                  * session-id if we want it to be single use.
 842                  * Currently I will not implement the '0' length session-id
 843                  * 12-Jan-98 - I'll now support the '0' length stuff.
 844                  */
 845                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 846                         s->session->session_id_length=0;
 847
 848                 sl=s->session->session_id_length;
 849                 *(p++)=sl;
 850                 memcpy(p,s->session->session_id,sl);
 851                 p+=sl;
 852
 853                 /* put the cipher */
 854                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 855                 p+=i;
 856
 857                 /* put the compression method */
 858                 if (s->s3->tmp.new_compression == NULL)
 859                         *(p++)=0;
 860                 else
 861                         *(p++)=s->s3->tmp.new_compression->id;
 862
 863                 /* do the header */
 864                 l=(p-d);
 865                 d=buf;
 866                 *(d++)=SSL3_MT_SERVER_HELLO;
 867                 l2n3(l,d);
 868
 869                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 870                 /* number of bytes to write */
 871                 s->init_num=p-buf;
 872                 s->init_off=0;
 873                 }
 874
 875         /* SSL3_ST_CW_CLNT_HELLO_B */
 876         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 877         }
 878
 879 static int ssl3_send_server_done(SSL *s)
 880         {
 881         unsigned char *p;
 882
 883         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 884                 {
 885                 p=(unsigned char *)s->init_buf->data;
 886
 887                 /* do the header */
 888                 *(p++)=SSL3_MT_SERVER_DONE;
 889                 *(p++)=0;
 890                 *(p++)=0;
 891                 *(p++)=0;
 892
 893                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 894                 /* number of bytes to write */
 895                 s->init_num=4;
 896                 s->init_off=0;
 897                 }
 898
 899         /* SSL3_ST_CW_CLNT_HELLO_B */
 900         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 901         }
 902
 903 static int ssl3_send_server_key_exchange(SSL *s)
 904         {
 905 #ifndef NO_RSA
 906         unsigned char *q;
 907         int j,num;
 908         RSA *rsa;
 909         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 910         unsigned int u;
 911 #endif
 912 #ifndef NO_DH
 913         DH *dh=NULL,*dhp;
 914 #endif
 915         EVP_PKEY *pkey;
 916         unsigned char *p,*d;
 917         int al,i;
 918         unsigned long type;
 919         int n;
 920         CERT *cert;
 921         BIGNUM *r[4];
 922         int nr[4],kn;
 923         BUF_MEM *buf;
 924         EVP_MD_CTX md_ctx;
 925
 926         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 927                 {
 928                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 929                 cert=s->cert;
 930
 931                 buf=s->init_buf;
 932
 933                 r[0]=r[1]=r[2]=r[3]=NULL;
 934                 n=0;
 935 #ifndef NO_RSA
 936                 if (type & SSL_kRSA)
 937                         {
 938                         rsa=cert->rsa_tmp;
 939                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 940                                 {
 941                                 rsa=s->cert->rsa_tmp_cb(s,
 942                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 943                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 944                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 945                                 cert->rsa_tmp=rsa;
 946                                 }
 947                         if (rsa == NULL)
 948                                 {
 949                                 al=SSL_AD_HANDSHAKE_FAILURE;
 950                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 951                                 goto f_err;
 952                                 }
 953                         r[0]=rsa->n;
 954                         r[1]=rsa->e;
 955                         s->s3->tmp.use_rsa_tmp=1;
 956                         }
 957                 else
 958 #endif
 959 #ifndef NO_DH
 960                         if (type & SSL_kEDH)
 961                         {
 962                         dhp=cert->dh_tmp;
 963                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 964                                 dhp=s->cert->dh_tmp_cb(s,
 965                                       !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 966                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 967                         if (dhp == NULL)
 968                                 {
 969                                 al=SSL_AD_HANDSHAKE_FAILURE;
 970                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 971                                 goto f_err;
 972                                 }
 973
 974                         if (s->s3->tmp.dh != NULL)
 975                                 {
 976                                 DH_free(dh);
 977                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, SSL_R_INTERNAL_ERROR);
 978                                 goto err;
 979                                 }
 980
 981                         if ((dh=DHparams_dup(dhp)) == NULL)
 982                                 {
 983                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 984                                 goto err;
 985                                 }
 986
 987                         s->s3->tmp.dh=dh;
 988                         if ((dhp->pub_key == NULL ||
 989                              dhp->priv_key == NULL ||
 990                              (s->options & SSL_OP_SINGLE_DH_USE)))
 991                                 {
 992                                 if(!DH_generate_key(dh))
 993                                     {
 994                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
 995                                            ERR_R_DH_LIB);
 996                                     goto err;
 997                                     }
 998                                 }
 999                         else
1000                                 {
1001                                 dh->pub_key=BN_dup(dhp->pub_key);
1002                                 dh->priv_key=BN_dup(dhp->priv_key);
1003                                 if ((dh->pub_key == NULL) ||
1004                                         (dh->priv_key == NULL))
1005                                         {
1006                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1007                                         goto err;
1008                                         }
1009                                 }
1010                         r[0]=dh->p;
1011                         r[1]=dh->g;
1012                         r[2]=dh->pub_key;
1013                         }
1014                 else
1015 #endif
1016                         {
1017                         al=SSL_AD_HANDSHAKE_FAILURE;
1018                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1019                         goto f_err;
1020                         }
1021                 for (i=0; r[i] != NULL; i++)
1022                         {
1023                         nr[i]=BN_num_bytes(r[i]);
1024                         n+=2+nr[i];
1025                         }
1026
1027                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1028                         {
1029                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1030                                 == NULL)
1031                                 {
1032                                 al=SSL_AD_DECODE_ERROR;
1033                                 goto f_err;
1034                                 }
1035                         kn=EVP_PKEY_size(pkey);
1036                         }
1037                 else
1038                         {
1039                         pkey=NULL;
1040                         kn=0;
1041                         }
1042
1043                 if (!BUF_MEM_grow(buf,n+4+kn))
1044                         {
1045                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1046                         goto err;
1047                         }
1048                 d=(unsigned char *)s->init_buf->data;
1049                 p= &(d[4]);
1050
1051                 for (i=0; r[i] != NULL; i++)
1052                         {
1053                         s2n(nr[i],p);
1054                         BN_bn2bin(r[i],p);
1055                         p+=nr[i];
1056                         }
1057
1058                 /* not anonymous */
1059                 if (pkey != NULL)
1060                         {
1061                         /* n is the length of the params, they start at &(d[4])
1062                          * and p points to the space at the end. */
1063 #ifndef NO_RSA
1064                         if (pkey->type == EVP_PKEY_RSA)
1065                                 {
1066                                 q=md_buf;
1067                                 j=0;
1068                                 for (num=2; num > 0; num--)
1069                                         {
1070                                         EVP_DigestInit(&md_ctx,(num == 2)
1071                                                 ?s->ctx->md5:s->ctx->sha1);
1072                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1073                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1074                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1075                                         EVP_DigestFinal(&md_ctx,q,
1076                                                 (unsigned int *)&i);
1077                                         q+=i;
1078                                         j+=i;
1079                                         }
1080                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1081                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1082                                         {
1083                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1084                                         goto err;
1085                                         }
1086                                 s2n(u,p);
1087                                 n+=u+2;
1088                                 }
1089                         else
1090 #endif
1091 #if !defined(NO_DSA)
1092                                 if (pkey->type == EVP_PKEY_DSA)
1093                                 {
1094                                 /* lets do DSS */
1095                                 EVP_SignInit(&md_ctx,EVP_dss1());
1096                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1097                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1098                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1099                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1100                                         (unsigned int *)&i,pkey))
1101                                         {
1102                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1103                                         goto err;
1104                                         }
1105                                 s2n(i,p);
1106                                 n+=i+2;
1107                                 }
1108                         else
1109 #endif
1110                                 {
1111                                 /* Is this error check actually needed? */
1112                                 al=SSL_AD_HANDSHAKE_FAILURE;
1113                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1114                                 goto f_err;
1115                                 }
1116                         }
1117
1118                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1119                 l2n3(n,d);
1120
1121                 /* we should now have things packed up, so lets send
1122                  * it off */
1123                 s->init_num=n+4;
1124                 s->init_off=0;
1125                 }
1126
1127         s->state = SSL3_ST_SW_KEY_EXCH_B;
1128         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1129 f_err:
1130         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1131 err:
1132         return(-1);
1133         }
1134
1135 static int ssl3_send_certificate_request(SSL *s)
1136         {
1137         unsigned char *p,*d;
1138         int i,j,nl,off,n;
1139         STACK_OF(X509_NAME) *sk=NULL;
1140         X509_NAME *name;
1141         BUF_MEM *buf;
1142
1143         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1144                 {
1145                 buf=s->init_buf;
1146
1147                 d=p=(unsigned char *)&(buf->data[4]);
1148
1149                 /* get the list of acceptable cert types */
1150                 p++;
1151                 n=ssl3_get_req_cert_type(s,p);
1152                 d[0]=n;
1153                 p+=n;
1154                 n++;
1155
1156                 off=n;
1157                 p+=2;
1158                 n+=2;
1159
1160                 sk=SSL_get_client_CA_list(s);
1161                 nl=0;
1162                 if (sk != NULL)
1163                         {
1164                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1165                                 {
1166                                 name=sk_X509_NAME_value(sk,i);
1167                                 j=i2d_X509_NAME(name,NULL);
1168                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1169                                         {
1170                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1171                                         goto err;
1172                                         }
1173                                 p=(unsigned char *)&(buf->data[4+n]);
1174                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1175                                         {
1176                                         s2n(j,p);
1177                                         i2d_X509_NAME(name,&p);
1178                                         n+=2+j;
1179                                         nl+=2+j;
1180                                         }
1181                                 else
1182                                         {
1183                                         d=p;
1184                                         i2d_X509_NAME(name,&p);
1185                                         j-=2; s2n(j,d); j+=2;
1186                                         n+=j;
1187                                         nl+=j;
1188                                         }
1189                                 }
1190                         }
1191                 /* else no CA names */
1192                 p=(unsigned char *)&(buf->data[4+off]);
1193                 s2n(nl,p);
1194
1195                 d=(unsigned char *)buf->data;
1196                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1197                 l2n3(n,d);
1198
1199                 /* we should now have things packed up, so lets send
1200                  * it off */
1201
1202                 s->init_num=n+4;
1203                 s->init_off=0;
1204 #ifdef NETSCAPE_HANG_BUG
1205                 p=(unsigned char *)s->init_buf->data + s->init_num;
1206
1207                 /* do the header */
1208                 *(p++)=SSL3_MT_SERVER_DONE;
1209                 *(p++)=0;
1210                 *(p++)=0;
1211                 *(p++)=0;
1212                 s->init_num += 4;
1213 #endif
1214
1215                 }
1216
1217         /* SSL3_ST_SW_CERT_REQ_B */
1218         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1219 err:
1220         return(-1);
1221         }
1222
1223 static int ssl3_get_client_key_exchange(SSL *s)
1224         {
1225         int i,al,ok;
1226         long n;
1227         unsigned long l;
1228         unsigned char *p;
1229 #ifndef NO_RSA
1230         RSA *rsa=NULL;
1231         EVP_PKEY *pkey=NULL;
1232 #endif
1233 #ifndef NO_DH
1234         BIGNUM *pub=NULL;
1235         DH *dh_srvr;
1236 #endif
1237
1238         n=ssl3_get_message(s,
1239                 SSL3_ST_SR_KEY_EXCH_A,
1240                 SSL3_ST_SR_KEY_EXCH_B,
1241                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1242                 400, /* ???? */
1243                 &ok);
1244
1245         if (!ok) return((int)n);
1246         p=(unsigned char *)s->init_buf->data;
1247
1248         l=s->s3->tmp.new_cipher->algorithms;
1249
1250 #ifndef NO_RSA
1251         if (l & SSL_kRSA)
1252                 {
1253                 /* FIX THIS UP EAY EAY EAY EAY */
1254                 if (s->s3->tmp.use_rsa_tmp)
1255                         {
1256                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1257                                 rsa=s->cert->rsa_tmp;
1258                         /* Don't do a callback because rsa_tmp should
1259                          * be sent already */
1260                         if (rsa == NULL)
1261                                 {
1262                                 al=SSL_AD_HANDSHAKE_FAILURE;
1263                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1264                                 goto f_err;
1265
1266                                 }
1267                         }
1268                 else
1269                         {
1270                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1271                         if (    (pkey == NULL) ||
1272                                 (pkey->type != EVP_PKEY_RSA) ||
1273                                 (pkey->pkey.rsa == NULL))
1274                                 {
1275                                 al=SSL_AD_HANDSHAKE_FAILURE;
1276                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1277                                 goto f_err;
1278                                 }
1279                         rsa=pkey->pkey.rsa;
1280                         }
1281
1282                 /* TLS */
1283                 if (s->version > SSL3_VERSION)
1284                         {
1285                         n2s(p,i);
1286                         if (n != i+2)
1287                                 {
1288                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1289                                         {
1290                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1291                                         goto err;
1292                                         }
1293                                 else
1294                                         p-=2;
1295                                 }
1296                         else
1297                                 n=i;
1298                         }
1299
1300                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1301
1302 #if 0
1303                 /* If a bad decrypt, use a random master key */
1304                 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1305                         ((p[0] != (s->client_version>>8)) ||
1306                          (p[1] != (s->client_version & 0xff))))
1307                         {
1308                         int bad=1;
1309
1310                         if ((i == SSL_MAX_MASTER_KEY_LENGTH) &&
1311                                 (p[0] == (s->version>>8)) &&
1312                                 (p[1] == 0))
1313                                 {
1314                                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
1315                                         bad=0;
1316                                 }
1317                         if (bad)
1318                                 {
1319                                 p[0]=(s->version>>8);
1320                                 p[1]=(s->version & 0xff);
1321                                 RAND_pseudo_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1322                                 i=SSL_MAX_MASTER_KEY_LENGTH;
1323                                 }
1324                         /* else, an SSLeay bug, ssl only server, tls client */
1325                         }
1326 #else
1327                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1328                         {
1329                         al=SSL_AD_DECODE_ERROR;
1330                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1331                         goto f_err;
1332                         }
1333
1334                 if ((p[0] != (s->client_version>>8)) || (p[1] != (s->client_version & 0xff)))
1335                         {
1336                         al=SSL_AD_DECODE_ERROR;
1337                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1338                         goto f_err;
1339                         }
1340 #endif
1341
1342                 s->session->master_key_length=
1343                         s->method->ssl3_enc->generate_master_secret(s,
1344                                 s->session->master_key,
1345                                 p,i);
1346                 memset(p,0,i);
1347                 }
1348         else
1349 #endif
1350 #ifndef NO_DH
1351                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1352                 {
1353                 n2s(p,i);
1354                 if (n != i+2)
1355                         {
1356                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1357                                 {
1358                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1359                                 goto err;
1360                                 }
1361                         else
1362                                 {
1363                                 p-=2;
1364                                 i=(int)n;
1365                                 }
1366                         }
1367
1368                 if (n == 0L) /* the parameters are in the cert */
1369                         {
1370                         al=SSL_AD_HANDSHAKE_FAILURE;
1371                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1372                         goto f_err;
1373                         }
1374                 else
1375                         {
1376                         if (s->s3->tmp.dh == NULL)
1377                                 {
1378                                 al=SSL_AD_HANDSHAKE_FAILURE;
1379                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1380                                 goto f_err;
1381                                 }
1382                         else
1383                                 dh_srvr=s->s3->tmp.dh;
1384                         }
1385
1386                 pub=BN_bin2bn(p,i,NULL);
1387                 if (pub == NULL)
1388                         {
1389                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1390                         goto err;
1391                         }
1392
1393                 i=DH_compute_key(p,pub,dh_srvr);
1394
1395                 if (i <= 0)
1396                         {
1397                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1398                         goto err;
1399                         }
1400
1401                 DH_free(s->s3->tmp.dh);
1402                 s->s3->tmp.dh=NULL;
1403
1404                 BN_clear_free(pub);
1405                 pub=NULL;
1406                 s->session->master_key_length=
1407                         s->method->ssl3_enc->generate_master_secret(s,
1408                                 s->session->master_key,p,i);
1409                 }
1410         else
1411 #endif
1412                 {
1413                 al=SSL_AD_HANDSHAKE_FAILURE;
1414                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1415                 goto f_err;
1416                 }
1417
1418         return(1);
1419 f_err:
1420         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1421 #if !defined(NO_DH) || !defined(NO_RSA)
1422 err:
1423 #endif
1424         return(-1);
1425         }
1426
1427 static int ssl3_get_cert_verify(SSL *s)
1428         {
1429         EVP_PKEY *pkey=NULL;
1430         unsigned char *p;
1431         int al,ok,ret=0;
1432         long n;
1433         int type=0,i,j;
1434         X509 *peer;
1435
1436         n=ssl3_get_message(s,
1437                 SSL3_ST_SR_CERT_VRFY_A,
1438                 SSL3_ST_SR_CERT_VRFY_B,
1439                 -1,
1440                 512, /* 512? */
1441                 &ok);
1442
1443         if (!ok) return((int)n);
1444
1445         if (s->session->peer != NULL)
1446                 {
1447                 peer=s->session->peer;
1448                 pkey=X509_get_pubkey(peer);
1449                 type=X509_certificate_type(peer,pkey);
1450                 }
1451         else
1452                 {
1453                 peer=NULL;
1454                 pkey=NULL;
1455                 }
1456
1457         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1458                 {
1459                 s->s3->tmp.reuse_message=1;
1460                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1461                         {
1462                         al=SSL_AD_UNEXPECTED_MESSAGE;
1463                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1464                         goto f_err;
1465                         }
1466                 ret=1;
1467                 goto end;
1468                 }
1469
1470         if (peer == NULL)
1471                 {
1472                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1473                 al=SSL_AD_UNEXPECTED_MESSAGE;
1474                 goto f_err;
1475                 }
1476
1477         if (!(type & EVP_PKT_SIGN))
1478                 {
1479                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1480                 al=SSL_AD_ILLEGAL_PARAMETER;
1481                 goto f_err;
1482                 }
1483
1484         if (s->s3->change_cipher_spec)
1485                 {
1486                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1487                 al=SSL_AD_UNEXPECTED_MESSAGE;
1488                 goto f_err;
1489                 }
1490
1491         /* we now have a signature that we need to verify */
1492         p=(unsigned char *)s->init_buf->data;
1493         n2s(p,i);
1494         n-=2;
1495         if (i > n)
1496                 {
1497                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1498                 al=SSL_AD_DECODE_ERROR;
1499                 goto f_err;
1500                 }
1501
1502         j=EVP_PKEY_size(pkey);
1503         if ((i > j) || (n > j) || (n <= 0))
1504                 {
1505                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1506                 al=SSL_AD_DECODE_ERROR;
1507                 goto f_err;
1508                 }
1509
1510 #ifndef NO_RSA
1511         if (pkey->type == EVP_PKEY_RSA)
1512                 {
1513                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1514                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1515                                                         pkey->pkey.rsa);
1516                 if (i < 0)
1517                         {
1518                         al=SSL_AD_DECRYPT_ERROR;
1519                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1520                         goto f_err;
1521                         }
1522                 if (i == 0)
1523                         {
1524                         al=SSL_AD_DECRYPT_ERROR;
1525                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1526                         goto f_err;
1527                         }
1528                 }
1529         else
1530 #endif
1531 #ifndef NO_DSA
1532                 if (pkey->type == EVP_PKEY_DSA)
1533                 {
1534                 j=DSA_verify(pkey->save_type,
1535                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1536                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1537                 if (j <= 0)
1538                         {
1539                         /* bad signature */
1540                         al=SSL_AD_DECRYPT_ERROR;
1541                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1542                         goto f_err;
1543                         }
1544                 }
1545         else
1546 #endif
1547                 {
1548                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1549                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1550                 goto f_err;
1551                 }
1552
1553
1554         ret=1;
1555         if (0)
1556                 {
1557 f_err:
1558                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1559                 }
1560 end:
1561         EVP_PKEY_free(pkey);
1562         return(ret);
1563         }
1564
1565 static int ssl3_get_client_certificate(SSL *s)
1566         {
1567         int i,ok,al,ret= -1;
1568         X509 *x=NULL;
1569         unsigned long l,nc,llen,n;
1570         unsigned char *p,*d,*q;
1571         STACK_OF(X509) *sk=NULL;
1572
1573         n=ssl3_get_message(s,
1574                 SSL3_ST_SR_CERT_A,
1575                 SSL3_ST_SR_CERT_B,
1576                 -1,
1577 #if defined(MSDOS) && !defined(WIN32)
1578                 1024*30, /* 30k max cert list :-) */
1579 #else
1580                 1024*100, /* 100k max cert list :-) */
1581 #endif
1582                 &ok);
1583
1584         if (!ok) return((int)n);
1585
1586         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1587                 {
1588                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1589                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1590                         {
1591                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1592                         al=SSL_AD_HANDSHAKE_FAILURE;
1593                         goto f_err;
1594                         }
1595                 /* If tls asked for a client cert, the client must return a 0 list */
1596                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1597                         {
1598                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1599                         al=SSL_AD_UNEXPECTED_MESSAGE;
1600                         goto f_err;
1601                         }
1602                 s->s3->tmp.reuse_message=1;
1603                 return(1);
1604                 }
1605
1606         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1607                 {
1608                 al=SSL_AD_UNEXPECTED_MESSAGE;
1609                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1610                 goto f_err;
1611                 }
1612         d=p=(unsigned char *)s->init_buf->data;
1613
1614         if ((sk=sk_X509_new_null()) == NULL)
1615                 {
1616                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1617                 goto err;
1618                 }
1619
1620         n2l3(p,llen);
1621         if (llen+3 != n)
1622                 {
1623                 al=SSL_AD_DECODE_ERROR;
1624                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1625                 goto f_err;
1626                 }
1627         for (nc=0; nc<llen; )
1628                 {
1629                 n2l3(p,l);
1630                 if ((l+nc+3) > llen)
1631                         {
1632                         al=SSL_AD_DECODE_ERROR;
1633                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1634                         goto f_err;
1635                         }
1636
1637                 q=p;
1638                 x=d2i_X509(NULL,&p,l);
1639                 if (x == NULL)
1640                         {
1641                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1642                         goto err;
1643                         }
1644                 if (p != (q+l))
1645                         {
1646                         al=SSL_AD_DECODE_ERROR;
1647                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1648                         goto f_err;
1649                         }
1650                 if (!sk_X509_push(sk,x))
1651                         {
1652                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1653                         goto err;
1654                         }
1655                 x=NULL;
1656                 nc+=l+3;
1657                 }
1658
1659         if (sk_X509_num(sk) <= 0)
1660                 {
1661                 /* TLS does not mind 0 certs returned */
1662                 if (s->version == SSL3_VERSION)
1663                         {
1664                         al=SSL_AD_HANDSHAKE_FAILURE;
1665                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1666                         goto f_err;
1667                         }
1668                 /* Fail for TLS only if we required a certificate */
1669                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1670                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1671                         {
1672                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1673                         al=SSL_AD_HANDSHAKE_FAILURE;
1674                         goto f_err;
1675                         }
1676                 }
1677         else
1678                 {
1679                 i=ssl_verify_cert_chain(s,sk);
1680                 if (!i)
1681                         {
1682                         al=ssl_verify_alarm_type(s->verify_result);
1683                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1684                         goto f_err;
1685                         }
1686                 }
1687
1688         if (s->session->peer != NULL) /* This should not be needed */
1689                 X509_free(s->session->peer);
1690         s->session->peer=sk_X509_shift(sk);
1691         s->session->verify_result = s->verify_result;
1692
1693         /* With the current implementation, sess_cert will always be NULL
1694          * when we arrive here. */
1695         if (s->session->sess_cert == NULL)
1696                 {
1697                 s->session->sess_cert = ssl_sess_cert_new();
1698                 if (s->session->sess_cert == NULL)
1699                         {
1700                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1701                         goto err;
1702                         }
1703                 }
1704         if (s->session->sess_cert->cert_chain != NULL)
1705                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1706         s->session->sess_cert->cert_chain=sk;
1707
1708         sk=NULL;
1709
1710         ret=1;
1711         if (0)
1712                 {
1713 f_err:
1714                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1715                 }
1716 err:
1717         if (x != NULL) X509_free(x);
1718         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1719         return(ret);
1720         }
1721
1722 int ssl3_send_server_certificate(SSL *s)
1723         {
1724         unsigned long l;
1725         X509 *x;
1726
1727         if (s->state == SSL3_ST_SW_CERT_A)
1728                 {
1729                 x=ssl_get_server_send_cert(s);
1730                 if (x == NULL)
1731                         {
1732                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1733                         return(0);
1734                         }
1735
1736                 l=ssl3_output_cert_chain(s,x);
1737                 s->state=SSL3_ST_SW_CERT_B;
1738                 s->init_num=(int)l;
1739                 s->init_off=0;
1740                 }
1741
1742         /* SSL3_ST_SW_CERT_B */
1743         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1744         }