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 SSL_ST_BEFORE:
 148                 case SSL_ST_ACCEPT:
 149                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 150                 case SSL_ST_OK|SSL_ST_ACCEPT:
 151
 152                         s->server=1;
 153                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 154
 155                         if ((s->version>>8) != 3)
 156                                 abort();
 157                         /* s->version=SSL3_VERSION; */
 158                         s->type=SSL_ST_ACCEPT;
 159
 160                         if (s->init_buf == NULL)
 161                                 {
 162                                 if ((buf=BUF_MEM_new()) == NULL)
 163                                         {
 164                                         ret= -1;
 165                                         goto end;
 166                                         }
 167                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 168                                         {
 169                                         ret= -1;
 170                                         goto end;
 171                                         }
 172                                 s->init_buf=buf;
 173                                 }
 174
 175                         if (!ssl3_setup_buffers(s))
 176                                 {
 177                                 ret= -1;
 178                                 goto end;
 179                                 }
 180
 181                         /* Ok, we now need to push on a buffering BIO so that
 182                          * the output is sent in a way that TCP likes :-)
 183                          */
 184                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 185
 186                         s->init_num=0;
 187
 188                         if (s->state != SSL_ST_RENEGOTIATE)
 189                                 {
 190                                 ssl3_init_finished_mac(s);
 191                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 192                                 s->ctx->stats.sess_accept++;
 193                                 }
 194                         else
 195                                 {
 196                                 s->ctx->stats.sess_accept_renegotiate++;
 197                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 198                                 }
 199                         break;
 200
 201                 case SSL3_ST_SW_HELLO_REQ_A:
 202                 case SSL3_ST_SW_HELLO_REQ_B:
 203
 204                         s->shutdown=0;
 205                         ret=ssl3_send_hello_request(s);
 206                         if (ret <= 0) goto end;
 207                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 208                         s->state=SSL3_ST_SW_FLUSH;
 209                         s->init_num=0;
 210
 211                         ssl3_init_finished_mac(s);
 212                         break;
 213
 214                 case SSL3_ST_SW_HELLO_REQ_C:
 215                         s->state=SSL_ST_OK;
 216                         ret=1;
 217                         goto end;
 218                         /* break; */
 219
 220                 case SSL3_ST_SR_CLNT_HELLO_A:
 221                 case SSL3_ST_SR_CLNT_HELLO_B:
 222                 case SSL3_ST_SR_CLNT_HELLO_C:
 223
 224                         s->shutdown=0;
 225                         ret=ssl3_get_client_hello(s);
 226                         if (ret <= 0) goto end;
 227                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 228                         s->init_num=0;
 229                         break;
 230
 231                 case SSL3_ST_SW_SRVR_HELLO_A:
 232                 case SSL3_ST_SW_SRVR_HELLO_B:
 233                         ret=ssl3_send_server_hello(s);
 234                         if (ret <= 0) goto end;
 235
 236                         if (s->hit)
 237                                 s->state=SSL3_ST_SW_CHANGE_A;
 238                         else
 239                                 s->state=SSL3_ST_SW_CERT_A;
 240                         s->init_num=0;
 241                         break;
 242
 243                 case SSL3_ST_SW_CERT_A:
 244                 case SSL3_ST_SW_CERT_B:
 245                         /* Check if it is anon DH */
 246                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 247                                 {
 248                                 ret=ssl3_send_server_certificate(s);
 249                                 if (ret <= 0) goto end;
 250                                 }
 251                         else
 252                                 skip=1;
 253                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 254                         s->init_num=0;
 255                         break;
 256
 257                 case SSL3_ST_SW_KEY_EXCH_A:
 258                 case SSL3_ST_SW_KEY_EXCH_B:
 259                         l=s->s3->tmp.new_cipher->algorithms;
 260
 261                         /* clear this, it may get reset by
 262                          * send_server_key_exchange */
 263                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 264                                 s->s3->tmp.use_rsa_tmp=1;
 265                         else
 266                                 s->s3->tmp.use_rsa_tmp=0;
 267
 268                         /* only send if a DH key exchange, fortezza or
 269                          * RSA but we have a sign only certificate */
 270                         if (s->s3->tmp.use_rsa_tmp
 271                             || (l & (SSL_DH|SSL_kFZA))
 272                             || ((l & SSL_kRSA)
 273                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 274                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 275                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 276                                         )
 277                                     )
 278                                 )
 279                             )
 280                                 {
 281                                 ret=ssl3_send_server_key_exchange(s);
 282                                 if (ret <= 0) goto end;
 283                                 }
 284                         else
 285                                 skip=1;
 286
 287                         s->state=SSL3_ST_SW_CERT_REQ_A;
 288                         s->init_num=0;
 289                         break;
 290
 291                 case SSL3_ST_SW_CERT_REQ_A:
 292                 case SSL3_ST_SW_CERT_REQ_B:
 293                         if (/* don't request cert unless asked for it: */
 294                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 295                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 296                                  * don't request cert during re-negotiation: */
 297                                 ((s->session->peer != NULL) &&
 298                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 299                                 /* never request cert in anonymous ciphersuites
 300                                  * (see section "Certificate request" in SSL 3 drafts
 301                                  * and in RFC 2246): */
 302                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 303                                  /* ... except when the application insists on verification
 304                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 305                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
 306                                 {
 307                                 /* no cert request */
 308                                 skip=1;
 309                                 s->s3->tmp.cert_request=0;
 310                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 311                                 }
 312                         else
 313                                 {
 314                                 s->s3->tmp.cert_request=1;
 315                                 ret=ssl3_send_certificate_request(s);
 316                                 if (ret <= 0) goto end;
 317 #ifndef NETSCAPE_HANG_BUG
 318                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 319 #else
 320                                 s->state=SSL3_ST_SW_FLUSH;
 321                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 322 #endif
 323                                 s->init_num=0;
 324                                 }
 325                         break;
 326
 327                 case SSL3_ST_SW_SRVR_DONE_A:
 328                 case SSL3_ST_SW_SRVR_DONE_B:
 329                         ret=ssl3_send_server_done(s);
 330                         if (ret <= 0) goto end;
 331                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 332                         s->state=SSL3_ST_SW_FLUSH;
 333                         s->init_num=0;
 334                         break;
 335
 336                 case SSL3_ST_SW_FLUSH:
 337                         /* number of bytes to be flushed */
 338                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 339                         if (num1 > 0)
 340                                 {
 341                                 s->rwstate=SSL_WRITING;
 342                                 num1=BIO_flush(s->wbio);
 343                                 if (num1 <= 0) { ret= -1; goto end; }
 344                                 s->rwstate=SSL_NOTHING;
 345                                 }
 346
 347                         s->state=s->s3->tmp.next_state;
 348                         break;
 349
 350                 case SSL3_ST_SR_CERT_A:
 351                 case SSL3_ST_SR_CERT_B:
 352                         /* Check for second client hello (MS SGC) */
 353                         ret = ssl3_check_client_hello(s);
 354                         if (ret <= 0)
 355                                 goto end;
 356                         if (ret == 2)
 357                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 358                         else {
 359                                 /* could be sent for a DH cert, even if we
 360                                  * have not asked for it :-) */
 361                                 ret=ssl3_get_client_certificate(s);
 362                                 if (ret <= 0) goto end;
 363                                 s->init_num=0;
 364                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 365                         }
 366                         break;
 367
 368                 case SSL3_ST_SR_KEY_EXCH_A:
 369                 case SSL3_ST_SR_KEY_EXCH_B:
 370                         ret=ssl3_get_client_key_exchange(s);
 371                         if (ret <= 0) goto end;
 372                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 373                         s->init_num=0;
 374
 375                         /* We need to get hashes here so if there is
 376                          * a client cert, it can be verified */
 377                         s->method->ssl3_enc->cert_verify_mac(s,
 378                                 &(s->s3->finish_dgst1),
 379                                 &(s->s3->tmp.cert_verify_md[0]));
 380                         s->method->ssl3_enc->cert_verify_mac(s,
 381                                 &(s->s3->finish_dgst2),
 382                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 383
 384                         break;
 385
 386                 case SSL3_ST_SR_CERT_VRFY_A:
 387                 case SSL3_ST_SR_CERT_VRFY_B:
 388
 389                         /* we should decide if we expected this one */
 390                         ret=ssl3_get_cert_verify(s);
 391                         if (ret <= 0) goto end;
 392
 393                         s->state=SSL3_ST_SR_FINISHED_A;
 394                         s->init_num=0;
 395                         break;
 396
 397                 case SSL3_ST_SR_FINISHED_A:
 398                 case SSL3_ST_SR_FINISHED_B:
 399                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 400                                 SSL3_ST_SR_FINISHED_B);
 401                         if (ret <= 0) goto end;
 402                         if (s->hit)
 403                                 s->state=SSL_ST_OK;
 404                         else
 405                                 s->state=SSL3_ST_SW_CHANGE_A;
 406                         s->init_num=0;
 407                         break;
 408
 409                 case SSL3_ST_SW_CHANGE_A:
 410                 case SSL3_ST_SW_CHANGE_B:
 411
 412                         s->session->cipher=s->s3->tmp.new_cipher;
 413                         if (!s->method->ssl3_enc->setup_key_block(s))
 414                                 { ret= -1; goto end; }
 415
 416                         ret=ssl3_send_change_cipher_spec(s,
 417                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 418
 419                         if (ret <= 0) goto end;
 420                         s->state=SSL3_ST_SW_FINISHED_A;
 421                         s->init_num=0;
 422
 423                         if (!s->method->ssl3_enc->change_cipher_state(s,
 424                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 425                                 {
 426                                 ret= -1;
 427                                 goto end;
 428                                 }
 429
 430                         break;
 431
 432                 case SSL3_ST_SW_FINISHED_A:
 433                 case SSL3_ST_SW_FINISHED_B:
 434                         ret=ssl3_send_finished(s,
 435                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 436                                 s->method->ssl3_enc->server_finished_label,
 437                                 s->method->ssl3_enc->server_finished_label_len);
 438                         if (ret <= 0) goto end;
 439                         s->state=SSL3_ST_SW_FLUSH;
 440                         if (s->hit)
 441                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 442                         else
 443                                 s->s3->tmp.next_state=SSL_ST_OK;
 444                         s->init_num=0;
 445                         break;
 446
 447                 case SSL_ST_OK:
 448                         /* clean a few things up */
 449                         ssl3_cleanup_key_block(s);
 450
 451                         BUF_MEM_free(s->init_buf);
 452                         s->init_buf=NULL;
 453
 454                         /* remove buffering on output */
 455                         ssl_free_wbio_buffer(s);
 456
 457                         s->new_session=0;
 458                         s->init_num=0;
 459
 460                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 461
 462                         s->ctx->stats.sess_accept_good++;
 463                         /* s->server=1; */
 464                         s->handshake_func=ssl3_accept;
 465                         ret=1;
 466
 467                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 468
 469                         goto end;
 470                         /* break; */
 471
 472                 default:
 473                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 474                         ret= -1;
 475                         goto end;
 476                         /* break; */
 477                         }
 478
 479                 if (!s->s3->tmp.reuse_message && !skip)
 480                         {
 481                         if (s->debug)
 482                                 {
 483                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 484                                         goto end;
 485                                 }
 486
 487
 488                         if ((cb != NULL) && (s->state != state))
 489                                 {
 490                                 new_state=s->state;
 491                                 s->state=state;
 492                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 493                                 s->state=new_state;
 494                                 }
 495                         }
 496                 skip=0;
 497                 }
 498 end:
 499         /* BIO_flush(s->wbio); */
 500
 501         if (cb != NULL)
 502                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 503         s->in_handshake--;
 504         return(ret);
 505         }
 506
 507 static int ssl3_send_hello_request(SSL *s)
 508         {
 509         unsigned char *p;
 510
 511         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 512                 {
 513                 p=(unsigned char *)s->init_buf->data;
 514                 *(p++)=SSL3_MT_HELLO_REQUEST;
 515                 *(p++)=0;
 516                 *(p++)=0;
 517                 *(p++)=0;
 518
 519                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 520                 /* number of bytes to write */
 521                 s->init_num=4;
 522                 s->init_off=0;
 523                 }
 524
 525         /* SSL3_ST_SW_HELLO_REQ_B */
 526         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 527         }
 528
 529 static int ssl3_check_client_hello(SSL *s)
 530         {
 531         int ok;
 532         long n;
 533
 534         n=ssl3_get_message(s,
 535                 SSL3_ST_SR_CERT_A,
 536                 SSL3_ST_SR_CERT_B,
 537                 -1,
 538                 SSL3_RT_MAX_PLAIN_LENGTH,
 539                 &ok);
 540         if (!ok) return((int)n);
 541         s->s3->tmp.reuse_message = 1;
 542         if(s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO) return 2;
 543         return 1;
 544 }
 545
 546 static int ssl3_get_client_hello(SSL *s)
 547         {
 548         int i,j,ok,al,ret= -1;
 549         long n;
 550         unsigned long id;
 551         unsigned char *p,*d,*q;
 552         SSL_CIPHER *c;
 553         SSL_COMP *comp=NULL;
 554         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 555
 556         /* We do this so that we will respond with our native type.
 557          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 558          * This down switching should be handled by a different method.
 559          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 560          * TLSv1.
 561          */
 562         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 563                 {
 564                 s->first_packet=1;
 565                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 566                 }
 567         n=ssl3_get_message(s,
 568                 SSL3_ST_SR_CLNT_HELLO_B,
 569                 SSL3_ST_SR_CLNT_HELLO_C,
 570                 SSL3_MT_CLIENT_HELLO,
 571                 SSL3_RT_MAX_PLAIN_LENGTH,
 572                 &ok);
 573
 574         if (!ok) return((int)n);
 575         d=p=(unsigned char *)s->init_buf->data;
 576
 577         /* use version from inside client hello, not from record header
 578          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 579         s->client_version=(((int)p[0])<<8)|(int)p[1];
 580         p+=2;
 581
 582         /* load the client random */
 583         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 584         p+=SSL3_RANDOM_SIZE;
 585
 586         /* get the session-id */
 587         j= *(p++);
 588
 589         s->hit=0;
 590         if (j == 0)
 591                 {
 592                 if (!ssl_get_new_session(s,1))
 593                         goto err;
 594                 }
 595         else
 596                 {
 597                 i=ssl_get_prev_session(s,p,j);
 598                 if (i == 1)
 599                         { /* previous session */
 600                         s->hit=1;
 601                         }
 602                 else if (i == -1)
 603                         goto err;
 604                 else /* i == 0 */
 605                         {
 606                         if (!ssl_get_new_session(s,1))
 607                                 goto err;
 608                         }
 609                 }
 610
 611         p+=j;
 612         n2s(p,i);
 613         if ((i == 0) && (j != 0))
 614                 {
 615                 /* we need a cipher if we are not resuming a session */
 616                 al=SSL_AD_ILLEGAL_PARAMETER;
 617                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 618                 goto f_err;
 619                 }
 620         if ((i+p) > (d+n))
 621                 {
 622                 /* not enough data */
 623                 al=SSL_AD_DECODE_ERROR;
 624                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 625                 goto f_err;
 626                 }
 627         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 628                 == NULL))
 629                 {
 630                 goto err;
 631                 }
 632         p+=i;
 633
 634         /* If it is a hit, check that the cipher is in the list */
 635         if ((s->hit) && (i > 0))
 636                 {
 637                 j=0;
 638                 id=s->session->cipher->id;
 639
 640 #ifdef CIPHER_DEBUG
 641                 printf("client sent %d ciphers\n",sk_num(ciphers));
 642 #endif
 643                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 644                         {
 645                         c=sk_SSL_CIPHER_value(ciphers,i);
 646 #ifdef CIPHER_DEBUG
 647                         printf("client [%2d of %2d]:%s\n",
 648                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 649 #endif
 650                         if (c->id == id)
 651                                 {
 652                                 j=1;
 653                                 break;
 654                                 }
 655                         }
 656                 if (j == 0)
 657                         {
 658                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 659                                 {
 660                                 /* Very bad for multi-threading.... */
 661                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 662                                                                        0);
 663                                 }
 664                         else
 665                                 {
 666                                 /* we need to have the cipher in the cipher
 667                                  * list if we are asked to reuse it */
 668                                 al=SSL_AD_ILLEGAL_PARAMETER;
 669                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 670                                 goto f_err;
 671                                 }
 672                         }
 673                 }
 674
 675         /* compression */
 676         i= *(p++);
 677         q=p;
 678         for (j=0; j<i; j++)
 679                 {
 680                 if (p[j] == 0) break;
 681                 }
 682
 683         p+=i;
 684         if (j >= i)
 685                 {
 686                 /* no compress */
 687                 al=SSL_AD_DECODE_ERROR;
 688                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 689                 goto f_err;
 690                 }
 691
 692         /* Worst case, we will use the NULL compression, but if we have other
 693          * options, we will now look for them.  We have i-1 compression
 694          * algorithms from the client, starting at q. */
 695         s->s3->tmp.new_compression=NULL;
 696         if (s->ctx->comp_methods != NULL)
 697                 { /* See if we have a match */
 698                 int m,nn,o,v,done=0;
 699
 700                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 701                 for (m=0; m<nn; m++)
 702                         {
 703                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 704                         v=comp->id;
 705                         for (o=0; o<i; o++)
 706                                 {
 707                                 if (v == q[o])
 708                                         {
 709                                         done=1;
 710                                         break;
 711                                         }
 712                                 }
 713                         if (done) break;
 714                         }
 715                 if (done)
 716                         s->s3->tmp.new_compression=comp;
 717                 else
 718                         comp=NULL;
 719                 }
 720
 721         /* TLS does not mind if there is extra stuff */
 722         if (s->version == SSL3_VERSION)
 723                 {
 724                 if (p > (d+n))
 725                         {
 726                         /* wrong number of bytes,
 727                          * there could be more to follow */
 728                         al=SSL_AD_DECODE_ERROR;
 729                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 730                         goto f_err;
 731                         }
 732                 }
 733
 734         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 735          * pick a cipher */
 736
 737         if (!s->hit)
 738                 {
 739                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 740                 if (s->session->ciphers != NULL)
 741                         sk_SSL_CIPHER_free(s->session->ciphers);
 742                 s->session->ciphers=ciphers;
 743                 if (ciphers == NULL)
 744                         {
 745                         al=SSL_AD_ILLEGAL_PARAMETER;
 746                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 747                         goto f_err;
 748                         }
 749                 ciphers=NULL;
 750                 c=ssl3_choose_cipher(s,s->session->ciphers,
 751                                      ssl_get_ciphers_by_id(s));
 752
 753                 if (c == NULL)
 754                         {
 755                         al=SSL_AD_HANDSHAKE_FAILURE;
 756                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 757                         goto f_err;
 758                         }
 759                 s->s3->tmp.new_cipher=c;
 760                 }
 761         else
 762                 {
 763                 /* Session-id reuse */
 764 #ifdef REUSE_CIPHER_BUG
 765                 STACK_OF(SSL_CIPHER) *sk;
 766                 SSL_CIPHER *nc=NULL;
 767                 SSL_CIPHER *ec=NULL;
 768
 769                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 770                         {
 771                         sk=s->session->ciphers;
 772                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 773                                 {
 774                                 c=sk_SSL_CIPHER_value(sk,i);
 775                                 if (c->algorithms & SSL_eNULL)
 776                                         nc=c;
 777                                 if (SSL_C_IS_EXPORT(c))
 778                                         ec=c;
 779                                 }
 780                         if (nc != NULL)
 781                                 s->s3->tmp.new_cipher=nc;
 782                         else if (ec != NULL)
 783                                 s->s3->tmp.new_cipher=ec;
 784                         else
 785                                 s->s3->tmp.new_cipher=s->session->cipher;
 786                         }
 787                 else
 788 #endif
 789                 s->s3->tmp.new_cipher=s->session->cipher;
 790                 }
 791
 792         /* we now have the following setup.
 793          * client_random
 794          * cipher_list          - our prefered list of ciphers
 795          * ciphers              - the clients prefered list of ciphers
 796          * compression          - basically ignored right now
 797          * ssl version is set   - sslv3
 798          * s->session           - The ssl session has been setup.
 799          * s->hit               - session reuse flag
 800          * s->tmp.new_cipher    - the new cipher to use.
 801          */
 802
 803         ret=1;
 804         if (0)
 805                 {
 806 f_err:
 807                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 808                 }
 809 err:
 810         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 811         return(ret);
 812         }
 813
 814 static int ssl3_send_server_hello(SSL *s)
 815         {
 816         unsigned char *buf;
 817         unsigned char *p,*d;
 818         int i,sl;
 819         unsigned long l,Time;
 820
 821         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 822                 {
 823                 buf=(unsigned char *)s->init_buf->data;
 824                 p=s->s3->server_random;
 825                 Time=time(NULL);                        /* Time */
 826                 l2n(Time,p);
 827                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 828                 /* Do the message type and length last */
 829                 d=p= &(buf[4]);
 830
 831                 *(p++)=s->version>>8;
 832                 *(p++)=s->version&0xff;
 833
 834                 /* Random stuff */
 835                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 836                 p+=SSL3_RANDOM_SIZE;
 837
 838                 /* now in theory we have 3 options to sending back the
 839                  * session id.  If it is a re-use, we send back the
 840                  * old session-id, if it is a new session, we send
 841                  * back the new session-id or we send back a 0 length
 842                  * session-id if we want it to be single use.
 843                  * Currently I will not implement the '0' length session-id
 844                  * 12-Jan-98 - I'll now support the '0' length stuff.
 845                  */
 846                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 847                         s->session->session_id_length=0;
 848
 849                 sl=s->session->session_id_length;
 850                 *(p++)=sl;
 851                 memcpy(p,s->session->session_id,sl);
 852                 p+=sl;
 853
 854                 /* put the cipher */
 855                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 856                 p+=i;
 857
 858                 /* put the compression method */
 859                 if (s->s3->tmp.new_compression == NULL)
 860                         *(p++)=0;
 861                 else
 862                         *(p++)=s->s3->tmp.new_compression->id;
 863
 864                 /* do the header */
 865                 l=(p-d);
 866                 d=buf;
 867                 *(d++)=SSL3_MT_SERVER_HELLO;
 868                 l2n3(l,d);
 869
 870                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 871                 /* number of bytes to write */
 872                 s->init_num=p-buf;
 873                 s->init_off=0;
 874                 }
 875
 876         /* SSL3_ST_CW_CLNT_HELLO_B */
 877         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 878         }
 879
 880 static int ssl3_send_server_done(SSL *s)
 881         {
 882         unsigned char *p;
 883
 884         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 885                 {
 886                 p=(unsigned char *)s->init_buf->data;
 887
 888                 /* do the header */
 889                 *(p++)=SSL3_MT_SERVER_DONE;
 890                 *(p++)=0;
 891                 *(p++)=0;
 892                 *(p++)=0;
 893
 894                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 895                 /* number of bytes to write */
 896                 s->init_num=4;
 897                 s->init_off=0;
 898                 }
 899
 900         /* SSL3_ST_CW_CLNT_HELLO_B */
 901         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 902         }
 903
 904 static int ssl3_send_server_key_exchange(SSL *s)
 905         {
 906 #ifndef NO_RSA
 907         unsigned char *q;
 908         int j,num;
 909         RSA *rsa;
 910         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 911         unsigned int u;
 912 #endif
 913 #ifndef NO_DH
 914         DH *dh=NULL,*dhp;
 915 #endif
 916         EVP_PKEY *pkey;
 917         unsigned char *p,*d;
 918         int al,i;
 919         unsigned long type;
 920         int n;
 921         CERT *cert;
 922         BIGNUM *r[4];
 923         int nr[4],kn;
 924         BUF_MEM *buf;
 925         EVP_MD_CTX md_ctx;
 926
 927         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 928                 {
 929                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 930                 cert=s->cert;
 931
 932                 buf=s->init_buf;
 933
 934                 r[0]=r[1]=r[2]=r[3]=NULL;
 935                 n=0;
 936 #ifndef NO_RSA
 937                 if (type & SSL_kRSA)
 938                         {
 939                         rsa=cert->rsa_tmp;
 940                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 941                                 {
 942                                 rsa=s->cert->rsa_tmp_cb(s,
 943                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 944                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 945                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 946                                 cert->rsa_tmp=rsa;
 947                                 }
 948                         if (rsa == NULL)
 949                                 {
 950                                 al=SSL_AD_HANDSHAKE_FAILURE;
 951                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 952                                 goto f_err;
 953                                 }
 954                         r[0]=rsa->n;
 955                         r[1]=rsa->e;
 956                         s->s3->tmp.use_rsa_tmp=1;
 957                         }
 958                 else
 959 #endif
 960 #ifndef NO_DH
 961                         if (type & SSL_kEDH)
 962                         {
 963                         dhp=cert->dh_tmp;
 964                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 965                                 dhp=s->cert->dh_tmp_cb(s,
 966                                       !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 967                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 968                         if (dhp == NULL)
 969                                 {
 970                                 al=SSL_AD_HANDSHAKE_FAILURE;
 971                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 972                                 goto f_err;
 973                                 }
 974
 975                         if (s->s3->tmp.dh != NULL)
 976                                 {
 977                                 DH_free(dh);
 978                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, SSL_R_INTERNAL_ERROR);
 979                                 goto err;
 980                                 }
 981
 982                         if ((dh=DHparams_dup(dhp)) == NULL)
 983                                 {
 984                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 985                                 goto err;
 986                                 }
 987
 988                         s->s3->tmp.dh=dh;
 989                         if ((dhp->pub_key == NULL ||
 990                              dhp->priv_key == NULL ||
 991                              (s->options & SSL_OP_SINGLE_DH_USE)))
 992                                 {
 993                                 if(!DH_generate_key(dh))
 994                                     {
 995                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
 996                                            ERR_R_DH_LIB);
 997                                     goto err;
 998                                     }
 999                                 }
1000                         else
1001                                 {
1002                                 dh->pub_key=BN_dup(dhp->pub_key);
1003                                 dh->priv_key=BN_dup(dhp->priv_key);
1004                                 if ((dh->pub_key == NULL) ||
1005                                         (dh->priv_key == NULL))
1006                                         {
1007                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1008                                         goto err;
1009                                         }
1010                                 }
1011                         r[0]=dh->p;
1012                         r[1]=dh->g;
1013                         r[2]=dh->pub_key;
1014                         }
1015                 else
1016 #endif
1017                         {
1018                         al=SSL_AD_HANDSHAKE_FAILURE;
1019                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1020                         goto f_err;
1021                         }
1022                 for (i=0; r[i] != NULL; i++)
1023                         {
1024                         nr[i]=BN_num_bytes(r[i]);
1025                         n+=2+nr[i];
1026                         }
1027
1028                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1029                         {
1030                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1031                                 == NULL)
1032                                 {
1033                                 al=SSL_AD_DECODE_ERROR;
1034                                 goto f_err;
1035                                 }
1036                         kn=EVP_PKEY_size(pkey);
1037                         }
1038                 else
1039                         {
1040                         pkey=NULL;
1041                         kn=0;
1042                         }
1043
1044                 if (!BUF_MEM_grow(buf,n+4+kn))
1045                         {
1046                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1047                         goto err;
1048                         }
1049                 d=(unsigned char *)s->init_buf->data;
1050                 p= &(d[4]);
1051
1052                 for (i=0; r[i] != NULL; i++)
1053                         {
1054                         s2n(nr[i],p);
1055                         BN_bn2bin(r[i],p);
1056                         p+=nr[i];
1057                         }
1058
1059                 /* not anonymous */
1060                 if (pkey != NULL)
1061                         {
1062                         /* n is the length of the params, they start at &(d[4])
1063                          * and p points to the space at the end. */
1064 #ifndef NO_RSA
1065                         if (pkey->type == EVP_PKEY_RSA)
1066                                 {
1067                                 q=md_buf;
1068                                 j=0;
1069                                 for (num=2; num > 0; num--)
1070                                         {
1071                                         EVP_DigestInit(&md_ctx,(num == 2)
1072                                                 ?s->ctx->md5:s->ctx->sha1);
1073                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1074                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1075                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1076                                         EVP_DigestFinal(&md_ctx,q,
1077                                                 (unsigned int *)&i);
1078                                         q+=i;
1079                                         j+=i;
1080                                         }
1081                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1082                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1083                                         {
1084                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1085                                         goto err;
1086                                         }
1087                                 s2n(u,p);
1088                                 n+=u+2;
1089                                 }
1090                         else
1091 #endif
1092 #if !defined(NO_DSA)
1093                                 if (pkey->type == EVP_PKEY_DSA)
1094                                 {
1095                                 /* lets do DSS */
1096                                 EVP_SignInit(&md_ctx,EVP_dss1());
1097                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1098                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1099                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1100                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1101                                         (unsigned int *)&i,pkey))
1102                                         {
1103                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1104                                         goto err;
1105                                         }
1106                                 s2n(i,p);
1107                                 n+=i+2;
1108                                 }
1109                         else
1110 #endif
1111                                 {
1112                                 /* Is this error check actually needed? */
1113                                 al=SSL_AD_HANDSHAKE_FAILURE;
1114                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1115                                 goto f_err;
1116                                 }
1117                         }
1118
1119                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1120                 l2n3(n,d);
1121
1122                 /* we should now have things packed up, so lets send
1123                  * it off */
1124                 s->init_num=n+4;
1125                 s->init_off=0;
1126                 }
1127
1128         s->state = SSL3_ST_SW_KEY_EXCH_B;
1129         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1130 f_err:
1131         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1132 err:
1133         return(-1);
1134         }
1135
1136 static int ssl3_send_certificate_request(SSL *s)
1137         {
1138         unsigned char *p,*d;
1139         int i,j,nl,off,n;
1140         STACK_OF(X509_NAME) *sk=NULL;
1141         X509_NAME *name;
1142         BUF_MEM *buf;
1143
1144         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1145                 {
1146                 buf=s->init_buf;
1147
1148                 d=p=(unsigned char *)&(buf->data[4]);
1149
1150                 /* get the list of acceptable cert types */
1151                 p++;
1152                 n=ssl3_get_req_cert_type(s,p);
1153                 d[0]=n;
1154                 p+=n;
1155                 n++;
1156
1157                 off=n;
1158                 p+=2;
1159                 n+=2;
1160
1161                 sk=SSL_get_client_CA_list(s);
1162                 nl=0;
1163                 if (sk != NULL)
1164                         {
1165                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1166                                 {
1167                                 name=sk_X509_NAME_value(sk,i);
1168                                 j=i2d_X509_NAME(name,NULL);
1169                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1170                                         {
1171                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1172                                         goto err;
1173                                         }
1174                                 p=(unsigned char *)&(buf->data[4+n]);
1175                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1176                                         {
1177                                         s2n(j,p);
1178                                         i2d_X509_NAME(name,&p);
1179                                         n+=2+j;
1180                                         nl+=2+j;
1181                                         }
1182                                 else
1183                                         {
1184                                         d=p;
1185                                         i2d_X509_NAME(name,&p);
1186                                         j-=2; s2n(j,d); j+=2;
1187                                         n+=j;
1188                                         nl+=j;
1189                                         }
1190                                 }
1191                         }
1192                 /* else no CA names */
1193                 p=(unsigned char *)&(buf->data[4+off]);
1194                 s2n(nl,p);
1195
1196                 d=(unsigned char *)buf->data;
1197                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1198                 l2n3(n,d);
1199
1200                 /* we should now have things packed up, so lets send
1201                  * it off */
1202
1203                 s->init_num=n+4;
1204                 s->init_off=0;
1205 #ifdef NETSCAPE_HANG_BUG
1206                 p=(unsigned char *)s->init_buf->data + s->init_num;
1207
1208                 /* do the header */
1209                 *(p++)=SSL3_MT_SERVER_DONE;
1210                 *(p++)=0;
1211                 *(p++)=0;
1212                 *(p++)=0;
1213                 s->init_num += 4;
1214 #endif
1215
1216                 }
1217
1218         /* SSL3_ST_SW_CERT_REQ_B */
1219         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1220 err:
1221         return(-1);
1222         }
1223
1224 static int ssl3_get_client_key_exchange(SSL *s)
1225         {
1226         int i,al,ok;
1227         long n;
1228         unsigned long l;
1229         unsigned char *p;
1230 #ifndef NO_RSA
1231         RSA *rsa=NULL;
1232         EVP_PKEY *pkey=NULL;
1233 #endif
1234 #ifndef NO_DH
1235         BIGNUM *pub=NULL;
1236         DH *dh_srvr;
1237 #endif
1238
1239         n=ssl3_get_message(s,
1240                 SSL3_ST_SR_KEY_EXCH_A,
1241                 SSL3_ST_SR_KEY_EXCH_B,
1242                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1243                 400, /* ???? */
1244                 &ok);
1245
1246         if (!ok) return((int)n);
1247         p=(unsigned char *)s->init_buf->data;
1248
1249         l=s->s3->tmp.new_cipher->algorithms;
1250
1251 #ifndef NO_RSA
1252         if (l & SSL_kRSA)
1253                 {
1254                 /* FIX THIS UP EAY EAY EAY EAY */
1255                 if (s->s3->tmp.use_rsa_tmp)
1256                         {
1257                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1258                                 rsa=s->cert->rsa_tmp;
1259                         /* Don't do a callback because rsa_tmp should
1260                          * be sent already */
1261                         if (rsa == NULL)
1262                                 {
1263                                 al=SSL_AD_HANDSHAKE_FAILURE;
1264                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1265                                 goto f_err;
1266
1267                                 }
1268                         }
1269                 else
1270                         {
1271                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1272                         if (    (pkey == NULL) ||
1273                                 (pkey->type != EVP_PKEY_RSA) ||
1274                                 (pkey->pkey.rsa == NULL))
1275                                 {
1276                                 al=SSL_AD_HANDSHAKE_FAILURE;
1277                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1278                                 goto f_err;
1279                                 }
1280                         rsa=pkey->pkey.rsa;
1281                         }
1282
1283                 /* TLS */
1284                 if (s->version > SSL3_VERSION)
1285                         {
1286                         n2s(p,i);
1287                         if (n != i+2)
1288                                 {
1289                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1290                                         {
1291                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1292                                         goto err;
1293                                         }
1294                                 else
1295                                         p-=2;
1296                                 }
1297                         else
1298                                 n=i;
1299                         }
1300
1301                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1302
1303 #if 0
1304                 /* If a bad decrypt, use a random master key */
1305                 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1306                         ((p[0] != (s->client_version>>8)) ||
1307                          (p[1] != (s->client_version & 0xff))))
1308                         {
1309                         int bad=1;
1310
1311                         if ((i == SSL_MAX_MASTER_KEY_LENGTH) &&
1312                                 (p[0] == (s->version>>8)) &&
1313                                 (p[1] == 0))
1314                                 {
1315                                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
1316                                         bad=0;
1317                                 }
1318                         if (bad)
1319                                 {
1320                                 p[0]=(s->version>>8);
1321                                 p[1]=(s->version & 0xff);
1322                                 RAND_pseudo_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1323                                 i=SSL_MAX_MASTER_KEY_LENGTH;
1324                                 }
1325                         /* else, an SSLeay bug, ssl only server, tls client */
1326                         }
1327 #else
1328                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1329                         {
1330                         al=SSL_AD_DECODE_ERROR;
1331                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1332                         goto f_err;
1333                         }
1334
1335                 if ((p[0] != (s->client_version>>8)) || (p[1] != (s->client_version & 0xff)))
1336                         {
1337                         al=SSL_AD_DECODE_ERROR;
1338                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1339                         goto f_err;
1340                         }
1341 #endif
1342
1343                 s->session->master_key_length=
1344                         s->method->ssl3_enc->generate_master_secret(s,
1345                                 s->session->master_key,
1346                                 p,i);
1347                 memset(p,0,i);
1348                 }
1349         else
1350 #endif
1351 #ifndef NO_DH
1352                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1353                 {
1354                 n2s(p,i);
1355                 if (n != i+2)
1356                         {
1357                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1358                                 {
1359                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1360                                 goto err;
1361                                 }
1362                         else
1363                                 {
1364                                 p-=2;
1365                                 i=(int)n;
1366                                 }
1367                         }
1368
1369                 if (n == 0L) /* the parameters are in the cert */
1370                         {
1371                         al=SSL_AD_HANDSHAKE_FAILURE;
1372                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1373                         goto f_err;
1374                         }
1375                 else
1376                         {
1377                         if (s->s3->tmp.dh == NULL)
1378                                 {
1379                                 al=SSL_AD_HANDSHAKE_FAILURE;
1380                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1381                                 goto f_err;
1382                                 }
1383                         else
1384                                 dh_srvr=s->s3->tmp.dh;
1385                         }
1386
1387                 pub=BN_bin2bn(p,i,NULL);
1388                 if (pub == NULL)
1389                         {
1390                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1391                         goto err;
1392                         }
1393
1394                 i=DH_compute_key(p,pub,dh_srvr);
1395
1396                 if (i <= 0)
1397                         {
1398                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1399                         goto err;
1400                         }
1401
1402                 DH_free(s->s3->tmp.dh);
1403                 s->s3->tmp.dh=NULL;
1404
1405                 BN_clear_free(pub);
1406                 pub=NULL;
1407                 s->session->master_key_length=
1408                         s->method->ssl3_enc->generate_master_secret(s,
1409                                 s->session->master_key,p,i);
1410                 }
1411         else
1412 #endif
1413                 {
1414                 al=SSL_AD_HANDSHAKE_FAILURE;
1415                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1416                 goto f_err;
1417                 }
1418
1419         return(1);
1420 f_err:
1421         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1422 #if !defined(NO_DH) || !defined(NO_RSA)
1423 err:
1424 #endif
1425         return(-1);
1426         }
1427
1428 static int ssl3_get_cert_verify(SSL *s)
1429         {
1430         EVP_PKEY *pkey=NULL;
1431         unsigned char *p;
1432         int al,ok,ret=0;
1433         long n;
1434         int type=0,i,j;
1435         X509 *peer;
1436
1437         n=ssl3_get_message(s,
1438                 SSL3_ST_SR_CERT_VRFY_A,
1439                 SSL3_ST_SR_CERT_VRFY_B,
1440                 -1,
1441                 512, /* 512? */
1442                 &ok);
1443
1444         if (!ok) return((int)n);
1445
1446         if (s->session->peer != NULL)
1447                 {
1448                 peer=s->session->peer;
1449                 pkey=X509_get_pubkey(peer);
1450                 type=X509_certificate_type(peer,pkey);
1451                 }
1452         else
1453                 {
1454                 peer=NULL;
1455                 pkey=NULL;
1456                 }
1457
1458         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1459                 {
1460                 s->s3->tmp.reuse_message=1;
1461                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1462                         {
1463                         al=SSL_AD_UNEXPECTED_MESSAGE;
1464                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1465                         goto f_err;
1466                         }
1467                 ret=1;
1468                 goto end;
1469                 }
1470
1471         if (peer == NULL)
1472                 {
1473                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1474                 al=SSL_AD_UNEXPECTED_MESSAGE;
1475                 goto f_err;
1476                 }
1477
1478         if (!(type & EVP_PKT_SIGN))
1479                 {
1480                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1481                 al=SSL_AD_ILLEGAL_PARAMETER;
1482                 goto f_err;
1483                 }
1484
1485         if (s->s3->change_cipher_spec)
1486                 {
1487                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1488                 al=SSL_AD_UNEXPECTED_MESSAGE;
1489                 goto f_err;
1490                 }
1491
1492         /* we now have a signature that we need to verify */
1493         p=(unsigned char *)s->init_buf->data;
1494         n2s(p,i);
1495         n-=2;
1496         if (i > n)
1497                 {
1498                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1499                 al=SSL_AD_DECODE_ERROR;
1500                 goto f_err;
1501                 }
1502
1503         j=EVP_PKEY_size(pkey);
1504         if ((i > j) || (n > j) || (n <= 0))
1505                 {
1506                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1507                 al=SSL_AD_DECODE_ERROR;
1508                 goto f_err;
1509                 }
1510
1511 #ifndef NO_RSA
1512         if (pkey->type == EVP_PKEY_RSA)
1513                 {
1514                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1515                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1516                                                         pkey->pkey.rsa);
1517                 if (i < 0)
1518                         {
1519                         al=SSL_AD_DECRYPT_ERROR;
1520                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1521                         goto f_err;
1522                         }
1523                 if (i == 0)
1524                         {
1525                         al=SSL_AD_DECRYPT_ERROR;
1526                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1527                         goto f_err;
1528                         }
1529                 }
1530         else
1531 #endif
1532 #ifndef NO_DSA
1533                 if (pkey->type == EVP_PKEY_DSA)
1534                 {
1535                 j=DSA_verify(pkey->save_type,
1536                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1537                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1538                 if (j <= 0)
1539                         {
1540                         /* bad signature */
1541                         al=SSL_AD_DECRYPT_ERROR;
1542                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1543                         goto f_err;
1544                         }
1545                 }
1546         else
1547 #endif
1548                 {
1549                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1550                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1551                 goto f_err;
1552                 }
1553
1554
1555         ret=1;
1556         if (0)
1557                 {
1558 f_err:
1559                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1560                 }
1561 end:
1562         EVP_PKEY_free(pkey);
1563         return(ret);
1564         }
1565
1566 static int ssl3_get_client_certificate(SSL *s)
1567         {
1568         int i,ok,al,ret= -1;
1569         X509 *x=NULL;
1570         unsigned long l,nc,llen,n;
1571         unsigned char *p,*d,*q;
1572         STACK_OF(X509) *sk=NULL;
1573
1574         n=ssl3_get_message(s,
1575                 SSL3_ST_SR_CERT_A,
1576                 SSL3_ST_SR_CERT_B,
1577                 -1,
1578 #if defined(MSDOS) && !defined(WIN32)
1579                 1024*30, /* 30k max cert list :-) */
1580 #else
1581                 1024*100, /* 100k max cert list :-) */
1582 #endif
1583                 &ok);
1584
1585         if (!ok) return((int)n);
1586
1587         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1588                 {
1589                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1590                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1591                         {
1592                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1593                         al=SSL_AD_HANDSHAKE_FAILURE;
1594                         goto f_err;
1595                         }
1596                 /* If tls asked for a client cert, the client must return a 0 list */
1597                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1598                         {
1599                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1600                         al=SSL_AD_UNEXPECTED_MESSAGE;
1601                         goto f_err;
1602                         }
1603                 s->s3->tmp.reuse_message=1;
1604                 return(1);
1605                 }
1606
1607         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1608                 {
1609                 al=SSL_AD_UNEXPECTED_MESSAGE;
1610                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1611                 goto f_err;
1612                 }
1613         d=p=(unsigned char *)s->init_buf->data;
1614
1615         if ((sk=sk_X509_new_null()) == NULL)
1616                 {
1617                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1618                 goto err;
1619                 }
1620
1621         n2l3(p,llen);
1622         if (llen+3 != n)
1623                 {
1624                 al=SSL_AD_DECODE_ERROR;
1625                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1626                 goto f_err;
1627                 }
1628         for (nc=0; nc<llen; )
1629                 {
1630                 n2l3(p,l);
1631                 if ((l+nc+3) > llen)
1632                         {
1633                         al=SSL_AD_DECODE_ERROR;
1634                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1635                         goto f_err;
1636                         }
1637
1638                 q=p;
1639                 x=d2i_X509(NULL,&p,l);
1640                 if (x == NULL)
1641                         {
1642                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1643                         goto err;
1644                         }
1645                 if (p != (q+l))
1646                         {
1647                         al=SSL_AD_DECODE_ERROR;
1648                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1649                         goto f_err;
1650                         }
1651                 if (!sk_X509_push(sk,x))
1652                         {
1653                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1654                         goto err;
1655                         }
1656                 x=NULL;
1657                 nc+=l+3;
1658                 }
1659
1660         if (sk_X509_num(sk) <= 0)
1661                 {
1662                 /* TLS does not mind 0 certs returned */
1663                 if (s->version == SSL3_VERSION)
1664                         {
1665                         al=SSL_AD_HANDSHAKE_FAILURE;
1666                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1667                         goto f_err;
1668                         }
1669                 /* Fail for TLS only if we required a certificate */
1670                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1671                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1672                         {
1673                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1674                         al=SSL_AD_HANDSHAKE_FAILURE;
1675                         goto f_err;
1676                         }
1677                 }
1678         else
1679                 {
1680                 i=ssl_verify_cert_chain(s,sk);
1681                 if (!i)
1682                         {
1683                         al=ssl_verify_alarm_type(s->verify_result);
1684                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1685                         goto f_err;
1686                         }
1687                 }
1688
1689         if (s->session->peer != NULL) /* This should not be needed */
1690                 X509_free(s->session->peer);
1691         s->session->peer=sk_X509_shift(sk);
1692         s->session->verify_result = s->verify_result;
1693
1694         /* With the current implementation, sess_cert will always be NULL
1695          * when we arrive here. */
1696         if (s->session->sess_cert == NULL)
1697                 {
1698                 s->session->sess_cert = ssl_sess_cert_new();
1699                 if (s->session->sess_cert == NULL)
1700                         {
1701                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1702                         goto err;
1703                         }
1704                 }
1705         if (s->session->sess_cert->cert_chain != NULL)
1706                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1707         s->session->sess_cert->cert_chain=sk;
1708
1709         sk=NULL;
1710
1711         ret=1;
1712         if (0)
1713                 {
1714 f_err:
1715                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1716                 }
1717 err:
1718         if (x != NULL) X509_free(x);
1719         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1720         return(ret);
1721         }
1722
1723 int ssl3_send_server_certificate(SSL *s)
1724         {
1725         unsigned long l;
1726         X509 *x;
1727
1728         if (s->state == SSL3_ST_SW_CERT_A)
1729                 {
1730                 x=ssl_get_server_send_cert(s);
1731                 if (x == NULL)
1732                         {
1733                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1734                         return(0);
1735                         }
1736
1737                 l=ssl3_output_cert_chain(s,x);
1738                 s->state=SSL3_ST_SW_CERT_B;
1739                 s->init_num=(int)l;
1740                 s->init_off=0;
1741                 }
1742
1743         /* SSL3_ST_SW_CERT_B */
1744         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1745         }