ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #define REUSE_CIPHER_BUG
  60
  61 #include <stdio.h>
  62 #include "buffer.h"
  63 #include "rand.h"
  64 #include "objects.h"
  65 #include "evp.h"
  66 #include "x509.h"
  67 #include "ssl_locl.h"
  68
  69 #define BREAK   break
  70 /* SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_MALLOC_FAILURE);
  71  * SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
  72  * SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
  73  * SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_MALLOC_FAILURE);
  74  * SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
  75  */
  76
  77 #ifndef NOPROTO
  78 static SSL_METHOD *ssl3_get_server_method(int ver);
  79 static int ssl3_get_client_hello(SSL *s);
  80 static int ssl3_send_server_hello(SSL *s);
  81 static int ssl3_send_server_key_exchange(SSL *s);
  82 static int ssl3_send_certificate_request(SSL *s);
  83 static int ssl3_send_server_done(SSL *s);
  84 static int ssl3_get_cert_verify(SSL *s);
  85 static int ssl3_get_client_key_exchange(SSL *s);
  86 static int ssl3_get_client_certificate(SSL *s);
  87 static int ssl3_send_hello_request(SSL *s);
  88
  89 #else
  90
  91 static SSL_METHOD *ssl3_get_server_method();
  92 static int ssl3_get_client_hello();
  93 static int ssl3_send_server_hello();
  94 static int ssl3_send_server_key_exchange();
  95 static int ssl3_send_certificate_request();
  96 static int ssl3_send_server_done();
  97 static int ssl3_get_cert_verify();
  98 static int ssl3_get_client_key_exchange();
  99 static int ssl3_get_client_certificate();
 100 static int ssl3_send_hello_request();
 101
 102 #endif
 103
 104 static SSL_METHOD *ssl3_get_server_method(ver)
 105 int ver;
 106         {
 107         if (ver == SSL3_VERSION)
 108                 return(SSLv3_server_method());
 109         else
 110                 return(NULL);
 111         }
 112
 113 SSL_METHOD *SSLv3_server_method()
 114         {
 115         static int init=1;
 116         static SSL_METHOD SSLv3_server_data;
 117
 118         if (init)
 119                 {
 120                 init=0;
 121                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 122                         sizeof(SSL_METHOD));
 123                 SSLv3_server_data.ssl_accept=ssl3_accept;
 124                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 125                 }
 126         return(&SSLv3_server_data);
 127         }
 128
 129 int ssl3_accept(s)
 130 SSL *s;
 131         {
 132         BUF_MEM *buf;
 133         unsigned long l,Time=time(NULL);
 134         void (*cb)()=NULL;
 135         long num1;
 136         int ret= -1;
 137         CERT *ct;
 138         BIO *under;
 139         int new_state,state,skip=0;
 140
 141         RAND_seed(&Time,sizeof(Time));
 142         ERR_clear_error();
 143         clear_sys_error();
 144
 145         if (s->info_callback != NULL)
 146                 cb=s->info_callback;
 147         else if (s->ctx->info_callback != NULL)
 148                 cb=s->ctx->info_callback;
 149
 150         /* init things to blank */
 151         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 152         s->in_handshake++;
 153
 154 #ifdef undef
 155         /* FIX THIS EAY EAY EAY */
 156         /* we don't actually need a cert, we just need a cert or a DH_tmp */
 157         if (((s->session == NULL) || (s->session->cert == NULL)) &&
 158                 (s->cert == NULL))
 159                 {
 160                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 161                 ret= -1;
 162                 goto end;
 163                 }
 164 #endif
 165
 166         for (;;)
 167                 {
 168                 state=s->state;
 169
 170                 switch (s->state)
 171                         {
 172                 case SSL_ST_RENEGOTIATE:
 173                         s->new_session=1;
 174                         /* s->state=SSL_ST_ACCEPT; */
 175
 176                 case SSL_ST_BEFORE:
 177                 case SSL_ST_ACCEPT:
 178                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 179                 case SSL_ST_OK|SSL_ST_ACCEPT:
 180
 181                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 182
 183                         if ((s->version>>8) != 3)
 184                                 abort();
 185                         /* s->version=SSL3_VERSION; */
 186                         s->type=SSL_ST_ACCEPT;
 187
 188                         if (s->init_buf == NULL)
 189                                 {
 190                                 if ((buf=BUF_MEM_new()) == NULL)
 191                                         {
 192                                         ret= -1;
 193                                         goto end;
 194                                         }
 195                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 196                                         {
 197                                         ret= -1;
 198                                         goto end;
 199                                         }
 200                                 s->init_buf=buf;
 201                                 }
 202
 203                         if (!ssl3_setup_buffers(s))
 204                                 {
 205                                 ret= -1;
 206                                 goto end;
 207                                 }
 208
 209                         /* Ok, we now need to push on a buffering BIO so that
 210                          * the output is sent in a way that TCP likes :-)
 211                          */
 212                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 213
 214                         s->init_num=0;
 215
 216                         if (s->state != SSL_ST_RENEGOTIATE)
 217                                 {
 218                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 219                                 ssl3_init_finished_mac(s);
 220                                 s->ctx->sess_accept++;
 221                                 }
 222                         else
 223                                 {
 224                                 s->ctx->sess_accept_renegotiate++;
 225                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 226                                 }
 227                         break;
 228
 229                 case SSL3_ST_SW_HELLO_REQ_A:
 230                 case SSL3_ST_SW_HELLO_REQ_B:
 231
 232                         s->shutdown=0;
 233                         ret=ssl3_send_hello_request(s);
 234                         if (ret <= 0) goto end;
 235                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 236                         s->state=SSL3_ST_SW_FLUSH;
 237                         s->init_num=0;
 238
 239                         ssl3_init_finished_mac(s);
 240                         break;
 241
 242                 case SSL3_ST_SW_HELLO_REQ_C:
 243                         /* remove buffering on output */
 244                         under=BIO_pop(s->wbio);
 245                         if (under != NULL)
 246                                 s->wbio=under;
 247                         else
 248                                 abort(); /* ok */
 249                         BIO_free(s->bbio);
 250                         s->bbio=NULL;
 251
 252                         s->state=SSL_ST_OK;
 253                         ret=1;
 254                         goto end;
 255                         /* break; */
 256
 257                 case SSL3_ST_SR_CLNT_HELLO_A:
 258                 case SSL3_ST_SR_CLNT_HELLO_B:
 259                 case SSL3_ST_SR_CLNT_HELLO_C:
 260
 261                         s->shutdown=0;
 262                         ret=ssl3_get_client_hello(s);
 263                         if (ret <= 0) goto end;
 264                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 265                         s->init_num=0;
 266                         break;
 267
 268                 case SSL3_ST_SW_SRVR_HELLO_A:
 269                 case SSL3_ST_SW_SRVR_HELLO_B:
 270                         ret=ssl3_send_server_hello(s);
 271                         if (ret <= 0) goto end;
 272
 273                         if (s->hit)
 274                                 s->state=SSL3_ST_SW_CHANGE_A;
 275                         else
 276                                 s->state=SSL3_ST_SW_CERT_A;
 277                         s->init_num=0;
 278                         break;
 279
 280                 case SSL3_ST_SW_CERT_A:
 281                 case SSL3_ST_SW_CERT_B:
 282                         /* Check if it is anon DH */
 283                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 284                                 {
 285                                 ret=ssl3_send_server_certificate(s);
 286                                 if (ret <= 0) goto end;
 287                                 }
 288                         else
 289                                 skip=1;
 290                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 291                         s->init_num=0;
 292                         break;
 293
 294                 case SSL3_ST_SW_KEY_EXCH_A:
 295                 case SSL3_ST_SW_KEY_EXCH_B:
 296                         l=s->s3->tmp.new_cipher->algorithms;
 297                         if (s->session->cert == NULL)
 298                                 {
 299                                 if (s->cert != NULL)
 300                                         {
 301                                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 302                                         s->session->cert=s->cert;
 303                                         }
 304                                 else
 305                                         {
 306                                         CRYPTO_add(&s->ctx->default_cert->references,1,CRYPTO_LOCK_SSL_CERT);
 307                                         s->session->cert=s->ctx->default_cert;
 308                                         }
 309                                 }
 310                         ct=s->session->cert;
 311
 312                         /* clear this, it may get reset by
 313                          * send_server_key_exchange */
 314                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 315                                 s->s3->tmp.use_rsa_tmp=1;
 316                         else
 317                                 s->s3->tmp.use_rsa_tmp=0;
 318
 319                         /* only send if a DH key exchange, fortezza or
 320                          * RSA but we have a sign only certificate */
 321                         if ( s->s3->tmp.use_rsa_tmp ||
 322                             (l & (SSL_DH|SSL_kFZA)) ||
 323                             ((l & SSL_kRSA) &&
 324                              ((ct->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)||
 325                               ((l & SSL_EXPORT) &&
 326                                (EVP_PKEY_size(ct->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > 512)
 327                               )
 328                              )
 329                             )
 330                            )
 331                                 {
 332                                 ret=ssl3_send_server_key_exchange(s);
 333                                 if (ret <= 0) goto end;
 334                                 }
 335                         else
 336                                 skip=1;
 337
 338                         s->state=SSL3_ST_SW_CERT_REQ_A;
 339                         s->init_num=0;
 340                         break;
 341
 342                 case SSL3_ST_SW_CERT_REQ_A:
 343                 case SSL3_ST_SW_CERT_REQ_B:
 344                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 345                                 ((s->session->peer != NULL) &&
 346                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 347                                 {
 348                                 /* no cert request */
 349                                 skip=1;
 350                                 s->s3->tmp.cert_request=0;
 351                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 352                                 }
 353                         else
 354                                 {
 355                                 s->s3->tmp.cert_request=1;
 356                                 ret=ssl3_send_certificate_request(s);
 357                                 if (ret <= 0) goto end;
 358                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 359                                 s->init_num=0;
 360                                 }
 361                         break;
 362
 363                 case SSL3_ST_SW_SRVR_DONE_A:
 364                 case SSL3_ST_SW_SRVR_DONE_B:
 365                         ret=ssl3_send_server_done(s);
 366                         if (ret <= 0) goto end;
 367                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 368                         s->state=SSL3_ST_SW_FLUSH;
 369                         s->init_num=0;
 370                         break;
 371
 372                 case SSL3_ST_SW_FLUSH:
 373                         /* number of bytes to be flushed */
 374                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 375                         if (num1 > 0)
 376                                 {
 377                                 s->rwstate=SSL_WRITING;
 378                                 num1=BIO_flush(s->wbio);
 379                                 if (num1 <= 0) { ret= -1; goto end; }
 380                                 s->rwstate=SSL_NOTHING;
 381                                 }
 382
 383                         s->state=s->s3->tmp.next_state;
 384                         break;
 385
 386                 case SSL3_ST_SR_CERT_A:
 387                 case SSL3_ST_SR_CERT_B:
 388                         /* could be sent for a DH cert, even if we
 389                          * have not asked for it :-) */
 390                         ret=ssl3_get_client_certificate(s);
 391                         if (ret <= 0) goto end;
 392                         s->init_num=0;
 393                         s->state=SSL3_ST_SR_KEY_EXCH_A;
 394                         break;
 395
 396                 case SSL3_ST_SR_KEY_EXCH_A:
 397                 case SSL3_ST_SR_KEY_EXCH_B:
 398                         ret=ssl3_get_client_key_exchange(s);
 399                         if (ret <= 0) goto end;
 400                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 401                         s->init_num=0;
 402
 403                         /* We need to get hashes here so if there is
 404                          * a client cert, it can be verified */
 405                         s->method->ssl3_enc->cert_verify_mac(s,
 406                                 &(s->s3->finish_dgst1),
 407                                 &(s->s3->tmp.finish_md[0]));
 408                         s->method->ssl3_enc->cert_verify_mac(s,
 409                                 &(s->s3->finish_dgst2),
 410                                 &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]));
 411
 412                         break;
 413
 414                 case SSL3_ST_SR_CERT_VRFY_A:
 415                 case SSL3_ST_SR_CERT_VRFY_B:
 416
 417                         /* we should decide if we expected this one */
 418                         ret=ssl3_get_cert_verify(s);
 419                         if (ret <= 0) goto end;
 420
 421                         s->state=SSL3_ST_SR_FINISHED_A;
 422                         s->init_num=0;
 423                         break;
 424
 425                 case SSL3_ST_SR_FINISHED_A:
 426                 case SSL3_ST_SR_FINISHED_B:
 427                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 428                                 SSL3_ST_SR_FINISHED_B);
 429                         if (ret <= 0) goto end;
 430                         if (s->hit)
 431                                 s->state=SSL_ST_OK;
 432                         else
 433                                 s->state=SSL3_ST_SW_CHANGE_A;
 434                         s->init_num=0;
 435                         break;
 436
 437                 case SSL3_ST_SW_CHANGE_A:
 438                 case SSL3_ST_SW_CHANGE_B:
 439
 440                         s->session->cipher=s->s3->tmp.new_cipher;
 441                         if (!s->method->ssl3_enc->setup_key_block(s))
 442                                 { ret= -1; goto end; }
 443
 444                         ret=ssl3_send_change_cipher_spec(s,
 445                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 446
 447                         if (ret <= 0) goto end;
 448                         s->state=SSL3_ST_SW_FINISHED_A;
 449                         s->init_num=0;
 450
 451                         if (!s->method->ssl3_enc->change_cipher_state(s,
 452                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 453                                 {
 454                                 ret= -1;
 455                                 goto end;
 456                                 }
 457
 458                         break;
 459
 460                 case SSL3_ST_SW_FINISHED_A:
 461                 case SSL3_ST_SW_FINISHED_B:
 462                         ret=ssl3_send_finished(s,
 463                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 464                                 s->method->ssl3_enc->server_finished,
 465                                 s->method->ssl3_enc->server_finished_len);
 466                         if (ret <= 0) goto end;
 467                         s->state=SSL3_ST_SW_FLUSH;
 468                         if (s->hit)
 469                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 470                         else
 471                                 s->s3->tmp.next_state=SSL_ST_OK;
 472                         s->init_num=0;
 473                         break;
 474
 475                 case SSL_ST_OK:
 476                         /* clean a few things up */
 477                         ssl3_cleanup_key_block(s);
 478
 479                         BUF_MEM_free(s->init_buf);
 480                         s->init_buf=NULL;
 481
 482                         /* remove buffering on output */
 483                         under=BIO_pop(s->wbio);
 484                         if (under != NULL)
 485                                 s->wbio=under;
 486                         else
 487                                 abort(); /* ok */
 488                         BIO_free(s->bbio);
 489                         s->bbio=NULL;
 490
 491                         s->new_session=0;
 492                         s->init_num=0;
 493
 494                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 495
 496                         s->ctx->sess_accept_good++;
 497                         /* s->server=1; */
 498                         s->handshake_func=ssl3_accept;
 499                         ret=1;
 500
 501                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 502
 503                         goto end;
 504                         /* break; */
 505
 506                 default:
 507                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 508                         ret= -1;
 509                         goto end;
 510                         /* break; */
 511                         }
 512
 513                 if (!s->s3->tmp.reuse_message && !skip)
 514                         {
 515                         if (s->debug)
 516                                 {
 517                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 518                                         goto end;
 519                                 }
 520
 521
 522                         if ((cb != NULL) && (s->state != state))
 523                                 {
 524                                 new_state=s->state;
 525                                 s->state=state;
 526                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 527                                 s->state=new_state;
 528                                 }
 529                         }
 530                 skip=0;
 531                 }
 532 end:
 533         /* BIO_flush(s->wbio); */
 534
 535         if (cb != NULL)
 536                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 537         s->in_handshake--;
 538         return(ret);
 539         }
 540
 541 static int ssl3_send_hello_request(s)
 542 SSL *s;
 543         {
 544         unsigned char *p;
 545
 546         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 547                 {
 548                 p=(unsigned char *)s->init_buf->data;
 549                 *(p++)=SSL3_MT_CLIENT_REQUEST;
 550                 *(p++)=0;
 551                 *(p++)=0;
 552                 *(p++)=0;
 553
 554                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 555                 /* number of bytes to write */
 556                 s->init_num=4;
 557                 s->init_off=0;
 558                 }
 559
 560         /* SSL3_ST_SW_HELLO_REQ_B */
 561         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 562         }
 563
 564 static int ssl3_get_client_hello(s)
 565 SSL *s;
 566         {
 567         int i,j,ok,al,ret= -1;
 568         long n;
 569         unsigned long id;
 570         unsigned char *p,*d;
 571         SSL_CIPHER *c;
 572         STACK *ciphers=NULL;
 573
 574         /* We do this so that we will respond with our native type.
 575          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 576          * This down switching should be handled by a different method.
 577          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 578          * TLSv1.
 579          */
 580         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 581                 {
 582                 s->first_packet=1;
 583                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 584                 }
 585         n=ssl3_get_message(s,
 586                 SSL3_ST_SR_CLNT_HELLO_B,
 587                 SSL3_ST_SR_CLNT_HELLO_C,
 588                 SSL3_MT_CLIENT_HELLO,
 589                 SSL3_RT_MAX_PLAIN_LENGTH,
 590                 &ok);
 591
 592         if (!ok) return((int)n);
 593         d=p=(unsigned char *)s->init_buf->data;
 594
 595         /* The version number has already been checked in ssl3_get_message.
 596          * I a native TLSv1/SSLv3 method, the match must be correct except
 597          * perhaps for the first message */
 598         p+=2;
 599
 600         /* load the client random */
 601         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 602         p+=SSL3_RANDOM_SIZE;
 603
 604         /* get the session-id */
 605         j= *(p++);
 606
 607         s->hit=0;
 608         if (j == 0)
 609                 {
 610                 if (!ssl_get_new_session(s,1))
 611                         goto err;
 612                 }
 613         else
 614                 {
 615                 i=ssl_get_prev_session(s,p,j);
 616                 if (i == 1)
 617                         { /* previous session */
 618                         s->hit=1;
 619                         }
 620                 else
 621                         {
 622                         if (!ssl_get_new_session(s,1))
 623                                 goto err;
 624                         }
 625                 }
 626
 627         p+=j;
 628         n2s(p,i);
 629         if ((i == 0) && (j != 0))
 630                 {
 631                 /* we need a cipher if we are not resuming a session */
 632                 al=SSL_AD_ILLEGAL_PARAMETER;
 633                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 634                 goto f_err;
 635                 }
 636         if ((i+p) > (d+n))
 637                 {
 638                 /* not enough data */
 639                 al=SSL_AD_DECODE_ERROR;
 640                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 641                 goto f_err;
 642                 }
 643         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 644                 == NULL))
 645                 {
 646                 goto err;
 647                 }
 648         p+=i;
 649
 650         /* If it is a hit, check that the cipher is in the list */
 651         if ((s->hit) && (i > 0))
 652                 {
 653                 j=0;
 654                 id=s->session->cipher->id;
 655
 656                 for (i=0; i<sk_num(ciphers); i++)
 657                         {
 658                         c=(SSL_CIPHER *)sk_value(ciphers,i);
 659                         if (c->id == id)
 660                                 {
 661                                 j=1;
 662                                 break;
 663                                 }
 664                         }
 665                 if (j == 0)
 666                         {
 667                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_num(ciphers) == 1))
 668                                 {
 669                                 /* Very bad for multi-threading.... */
 670                                 s->session->cipher=
 671                                         (SSL_CIPHER *)sk_value(ciphers,0);
 672                                 }
 673                         else
 674                                 {
 675                                 /* we need to have the cipher in the cipher
 676                                  * list if we are asked to reuse it */
 677                                 al=SSL_AD_ILLEGAL_PARAMETER;
 678                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 679                                 goto f_err;
 680                                 }
 681                         }
 682                 }
 683
 684         /* compression */
 685         i= *(p++);
 686         for (j=0; j<i; j++)
 687                 if (p[j] == 0) break;
 688
 689         p+=i;
 690         if (j >= i)
 691                 {
 692                 /* no compress */
 693                 al=SSL_AD_DECODE_ERROR;
 694                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 695                 goto f_err;
 696                 }
 697
 698         /* TLS does not mind if there is extra stuff */
 699         if (s->version == SSL3_VERSION)
 700                 {
 701                 if (p > (d+n))
 702                         {
 703                         /* wrong number of bytes,
 704                          * there could be more to follow */
 705                         al=SSL_AD_DECODE_ERROR;
 706                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 707                         goto f_err;
 708                         }
 709                 }
 710
 711         /* do nothing with compression */
 712
 713         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 714          * pick a cipher */
 715
 716         if (!s->hit)
 717                 {
 718                 if (s->session->ciphers != NULL)
 719                         sk_free(s->session->ciphers);
 720                 s->session->ciphers=ciphers;
 721                 if (ciphers == NULL)
 722                         {
 723                         al=SSL_AD_ILLEGAL_PARAMETER;
 724                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 725                         goto f_err;
 726                         }
 727                 ciphers=NULL;
 728                 c=ssl3_choose_cipher(s,s->session->ciphers,
 729                         ssl_get_ciphers_by_id(s));
 730
 731                 if (c == NULL)
 732                         {
 733                         al=SSL_AD_HANDSHAKE_FAILURE;
 734                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 735                         goto f_err;
 736                         }
 737                 s->s3->tmp.new_cipher=c;
 738                 }
 739         else
 740                 {
 741                 /* Session-id reuse */
 742 #ifdef REUSE_CIPHER_BUG
 743                 STACK *sk;
 744                 SSL_CIPHER *nc=NULL;
 745                 SSL_CIPHER *ec=NULL;
 746
 747                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 748                         {
 749                         sk=s->session->ciphers;
 750                         for (i=0; i<sk_num(sk); i++)
 751                                 {
 752                                 c=(SSL_CIPHER *)sk_value(sk,i);
 753                                 if (c->algorithms & SSL_eNULL)
 754                                         nc=c;
 755                                 if (c->algorithms & SSL_EXP)
 756                                         ec=c;
 757                                 }
 758                         if (nc != NULL)
 759                                 s->s3->tmp.new_cipher=nc;
 760                         else if (ec != NULL)
 761                                 s->s3->tmp.new_cipher=ec;
 762                         else
 763                                 s->s3->tmp.new_cipher=s->session->cipher;
 764                         }
 765                 else
 766 #endif
 767                 s->s3->tmp.new_cipher=s->session->cipher;
 768                 }
 769
 770         /* we now have the following setup.
 771          * client_random
 772          * cipher_list          - our prefered list of ciphers
 773          * ciphers              - the clients prefered list of ciphers
 774          * compression          - basically ignored right now
 775          * ssl version is set   - sslv3
 776          * s->session           - The ssl session has been setup.
 777          * s->hit               - sesson reuse flag
 778          * s->tmp.new_cipher    - the new cipher to use.
 779          */
 780
 781         ret=1;
 782         if (0)
 783                 {
 784 f_err:
 785                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 786                 }
 787 err:
 788         if (ciphers != NULL) sk_free(ciphers);
 789         return(ret);
 790         }
 791
 792 static int ssl3_send_server_hello(s)
 793 SSL *s;
 794         {
 795         unsigned char *buf;
 796         unsigned char *p,*d;
 797         int i,sl;
 798         unsigned long l,Time;
 799
 800         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 801                 {
 802                 buf=(unsigned char *)s->init_buf->data;
 803                 p=s->s3->server_random;
 804                 Time=time(NULL);                        /* Time */
 805                 l2n(Time,p);
 806                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 807                 /* Do the message type and length last */
 808                 d=p= &(buf[4]);
 809
 810                 *(p++)=s->version>>8;
 811                 *(p++)=s->version&0xff;
 812
 813                 /* Random stuff */
 814                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 815                 p+=SSL3_RANDOM_SIZE;
 816
 817                 /* now in theory we have 3 options to sending back the
 818                  * session id.  If it is a re-use, we send back the
 819                  * old session-id, if it is a new session, we send
 820                  * back the new session-id or we send back a 0 length
 821                  * session-id if we want it to be single use.
 822                  * Currently I will not implement the '0' length session-id
 823                  * 12-Jan-98 - I'll now support the '0' length stuff.
 824                  */
 825                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 826                         s->session->session_id_length=0;
 827
 828                 sl=s->session->session_id_length;
 829                 *(p++)=sl;
 830                 memcpy(p,s->session->session_id,sl);
 831                 p+=sl;
 832
 833                 /* put the cipher */
 834                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 835                 p+=i;
 836
 837                 /* put the compression method */
 838                 *(p++)=0;
 839
 840                 /* do the header */
 841                 l=(p-d);
 842                 d=buf;
 843                 *(d++)=SSL3_MT_SERVER_HELLO;
 844                 l2n3(l,d);
 845
 846                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 847                 /* number of bytes to write */
 848                 s->init_num=p-buf;
 849                 s->init_off=0;
 850                 }
 851
 852         /* SSL3_ST_CW_CLNT_HELLO_B */
 853         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 854         }
 855
 856 static int ssl3_send_server_done(s)
 857 SSL *s;
 858         {
 859         unsigned char *p;
 860
 861         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 862                 {
 863                 p=(unsigned char *)s->init_buf->data;
 864
 865                 /* do the header */
 866                 *(p++)=SSL3_MT_SERVER_DONE;
 867                 *(p++)=0;
 868                 *(p++)=0;
 869                 *(p++)=0;
 870
 871                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 872                 /* number of bytes to write */
 873                 s->init_num=4;
 874                 s->init_off=0;
 875                 }
 876
 877         /* SSL3_ST_CW_CLNT_HELLO_B */
 878         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 879         }
 880
 881 static int ssl3_send_server_key_exchange(s)
 882 SSL *s;
 883         {
 884 #ifndef NO_RSA
 885         unsigned char *q;
 886         int j,num;
 887         RSA *rsa;
 888         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 889 #endif
 890 #ifndef NO_DH
 891         DH *dh,*dhp;
 892 #endif
 893         EVP_PKEY *pkey;
 894         unsigned char *p,*d;
 895         int al,i;
 896         unsigned long type;
 897         int n;
 898         CERT *cert;
 899         BIGNUM *r[4];
 900         int nr[4],kn;
 901         BUF_MEM *buf;
 902         EVP_MD_CTX md_ctx;
 903
 904         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 905                 {
 906                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 907                 cert=s->session->cert;
 908
 909                 buf=s->init_buf;
 910
 911                 r[0]=r[1]=r[2]=r[3]=NULL;
 912                 n=0;
 913 #ifndef NO_RSA
 914                 if (type & SSL_kRSA)
 915                         {
 916                         rsa=cert->rsa_tmp;
 917                         if ((rsa == NULL) && (s->ctx->default_cert->rsa_tmp_cb != NULL))
 918                                 {
 919                                 rsa=s->ctx->default_cert->rsa_tmp_cb(s,
 920                                         !(s->s3->tmp.new_cipher->algorithms
 921                                           &SSL_NOT_EXP));
 922                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 923                                 cert->rsa_tmp=rsa;
 924                                 }
 925                         if (rsa == NULL)
 926                                 {
 927                                 al=SSL_AD_HANDSHAKE_FAILURE;
 928                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 929                                 goto f_err;
 930                                 }
 931                         r[0]=rsa->n;
 932                         r[1]=rsa->e;
 933                         s->s3->tmp.use_rsa_tmp=1;
 934                         }
 935                 else
 936 #endif
 937 #ifndef NO_DH
 938                         if (type & SSL_kEDH)
 939                         {
 940                         dhp=cert->dh_tmp;
 941                         if ((dhp == NULL) && (cert->dh_tmp_cb != NULL))
 942                                 dhp=cert->dh_tmp_cb(s,
 943                                         !(s->s3->tmp.new_cipher->algorithms
 944                                           &SSL_NOT_EXP));
 945                         if (dhp == NULL)
 946                                 {
 947                                 al=SSL_AD_HANDSHAKE_FAILURE;
 948                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 949                                 goto f_err;
 950                                 }
 951                         if ((dh=DHparams_dup(dhp)) == NULL)
 952                                 {
 953                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 954                                 goto err;
 955                                 }
 956
 957                         s->s3->tmp.dh=dh;
 958                         if ((dhp->pub_key == NULL ||
 959                              dhp->priv_key == NULL ||
 960                              (s->options & SSL_OP_SINGLE_DH_USE)))
 961                                 {
 962                                 if(!DH_generate_key(dh))
 963                                     {
 964                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
 965                                            ERR_R_DH_LIB);
 966                                     goto err;
 967                                     }
 968                                 }
 969                         else
 970                                 {
 971                                 dh->pub_key=BN_dup(dhp->pub_key);
 972                                 dh->priv_key=BN_dup(dhp->priv_key);
 973                                 if ((dh->pub_key == NULL) ||
 974                                         (dh->priv_key == NULL))
 975                                         {
 976                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 977                                         goto err;
 978                                         }
 979                                 }
 980                         r[0]=dh->p;
 981                         r[1]=dh->g;
 982                         r[2]=dh->pub_key;
 983                         }
 984                 else
 985 #endif
 986                         {
 987                         al=SSL_AD_HANDSHAKE_FAILURE;
 988                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 989                         goto f_err;
 990                         }
 991                 for (i=0; r[i] != NULL; i++)
 992                         {
 993                         nr[i]=BN_num_bytes(r[i]);
 994                         n+=2+nr[i];
 995                         }
 996
 997                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 998                         {
 999                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1000                                 == NULL)
1001                                 {
1002                                 al=SSL_AD_DECODE_ERROR;
1003                                 goto f_err;
1004                                 }
1005                         kn=EVP_PKEY_size(pkey);
1006                         }
1007                 else
1008                         {
1009                         pkey=NULL;
1010                         kn=0;
1011                         }
1012
1013                 if (!BUF_MEM_grow(buf,n+4+kn))
1014                         {
1015                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1016                         goto err;
1017                         }
1018                 d=(unsigned char *)s->init_buf->data;
1019                 p= &(d[4]);
1020
1021                 for (i=0; r[i] != NULL; i++)
1022                         {
1023                         s2n(nr[i],p);
1024                         BN_bn2bin(r[i],p);
1025                         p+=nr[i];
1026                         }
1027
1028                 /* not anonymous */
1029                 if (pkey != NULL)
1030                         {
1031                         /* n is the length of the params, they start at &(d[4])
1032                          * and p points to the space at the end. */
1033 #ifndef NO_RSA
1034                         if (pkey->type == EVP_PKEY_RSA)
1035                                 {
1036                                 q=md_buf;
1037                                 j=0;
1038                                 for (num=2; num > 0; num--)
1039                                         {
1040                                         EVP_DigestInit(&md_ctx,(num == 2)
1041                                                 ?s->ctx->md5:s->ctx->sha1);
1042                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1043                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1044                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1045                                         EVP_DigestFinal(&md_ctx,q,
1046                                                 (unsigned int *)&i);
1047                                         q+=i;
1048                                         j+=i;
1049                                         }
1050                                 i=RSA_private_encrypt(j,md_buf,&(p[2]),
1051                                         pkey->pkey.rsa,RSA_PKCS1_PADDING);
1052                                 if (i <= 0)
1053                                         {
1054                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1055                                         goto err;
1056                                         }
1057                                 s2n(i,p);
1058                                 n+=i+2;
1059                                 }
1060                         else
1061 #endif
1062 #if !defined(NO_DSA)
1063                                 if (pkey->type == EVP_PKEY_DSA)
1064                                 {
1065                                 /* lets do DSS */
1066                                 EVP_SignInit(&md_ctx,EVP_dss1());
1067                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1068                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1069                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1070                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1071                                         (unsigned int *)&i,pkey))
1072                                         {
1073                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1074                                         goto err;
1075                                         }
1076                                 s2n(i,p);
1077                                 n+=i+2;
1078                                 }
1079                         else
1080 #endif
1081                                 {
1082                                 /* Is this error check actually needed? */
1083                                 al=SSL_AD_HANDSHAKE_FAILURE;
1084                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1085                                 goto f_err;
1086                                 }
1087                         }
1088
1089                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1090                 l2n3(n,d);
1091
1092                 /* we should now have things packed up, so lets send
1093                  * it off */
1094                 s->init_num=n+4;
1095                 s->init_off=0;
1096                 }
1097
1098         /* SSL3_ST_SW_KEY_EXCH_B */
1099         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1100 f_err:
1101         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1102 err:
1103         return(-1);
1104         }
1105
1106 static int ssl3_send_certificate_request(s)
1107 SSL *s;
1108         {
1109         unsigned char *p,*d;
1110         int i,j,nl,off,n;
1111         STACK *sk=NULL;
1112         X509_NAME *name;
1113         BUF_MEM *buf;
1114
1115         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1116                 {
1117                 buf=s->init_buf;
1118
1119                 d=p=(unsigned char *)&(buf->data[4]);
1120
1121                 /* get the list of acceptable cert types */
1122                 p++;
1123                 n=ssl3_get_req_cert_type(s,p);
1124                 d[0]=n;
1125                 p+=n;
1126                 n++;
1127
1128                 off=n;
1129                 p+=2;
1130                 n+=2;
1131
1132                 sk=SSL_get_client_CA_list(s);
1133                 nl=0;
1134                 if (sk != NULL)
1135                         {
1136                         for (i=0; i<sk_num(sk); i++)
1137                                 {
1138                                 name=(X509_NAME *)sk_value(sk,i);
1139                                 j=i2d_X509_NAME(name,NULL);
1140                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1141                                         {
1142                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1143                                         goto err;
1144                                         }
1145                                 p=(unsigned char *)&(buf->data[4+n]);
1146                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1147                                         {
1148                                         s2n(j,p);
1149                                         i2d_X509_NAME(name,&p);
1150                                         n+=2+j;
1151                                         nl+=2+j;
1152                                         }
1153                                 else
1154                                         {
1155                                         d=p;
1156                                         i2d_X509_NAME(name,&p);
1157                                         j-=2; s2n(j,d); j+=2;
1158                                         n+=j;
1159                                         nl+=j;
1160                                         }
1161                                 }
1162                         }
1163                 /* else no CA names */
1164                 p=(unsigned char *)&(buf->data[4+off]);
1165                 s2n(nl,p);
1166
1167                 d=(unsigned char *)buf->data;
1168                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1169                 l2n3(n,d);
1170
1171                 /* we should now have things packed up, so lets send
1172                  * it off */
1173
1174                 s->init_num=n+4;
1175                 s->init_off=0;
1176                 }
1177
1178         /* SSL3_ST_SW_CERT_REQ_B */
1179         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1180 err:
1181         return(-1);
1182         }
1183
1184 static int ssl3_get_client_key_exchange(s)
1185 SSL *s;
1186         {
1187         int i,al,ok;
1188         long n;
1189         unsigned long l;
1190         unsigned char *p;
1191         RSA *rsa=NULL;
1192         EVP_PKEY *pkey=NULL;
1193 #ifndef NO_DH
1194         BIGNUM *pub=NULL;
1195         DH *dh_srvr;
1196 #endif
1197
1198         n=ssl3_get_message(s,
1199                 SSL3_ST_SR_KEY_EXCH_A,
1200                 SSL3_ST_SR_KEY_EXCH_B,
1201                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1202                 400, /* ???? */
1203                 &ok);
1204
1205         if (!ok) return((int)n);
1206         p=(unsigned char *)s->init_buf->data;
1207
1208         l=s->s3->tmp.new_cipher->algorithms;
1209
1210 #ifndef NO_RSA
1211         if (l & SSL_kRSA)
1212                 {
1213                 /* FIX THIS UP EAY EAY EAY EAY */
1214                 if (s->s3->tmp.use_rsa_tmp)
1215                         {
1216                         if ((s->session->cert != NULL) &&
1217                                 (s->session->cert->rsa_tmp != NULL))
1218                                 rsa=s->session->cert->rsa_tmp;
1219                         else if ((s->ctx->default_cert != NULL) &&
1220                                 (s->ctx->default_cert->rsa_tmp != NULL))
1221                                 rsa=s->ctx->default_cert->rsa_tmp;
1222                         /* Don't do a callback because rsa_tmp should
1223                          * be sent already */
1224                         if (rsa == NULL)
1225                                 {
1226                                 al=SSL_AD_HANDSHAKE_FAILURE;
1227                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1228                                 goto f_err;
1229
1230                                 }
1231                         }
1232                 else
1233                         {
1234                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1235                         if (    (pkey == NULL) ||
1236                                 (pkey->type != EVP_PKEY_RSA) ||
1237                                 (pkey->pkey.rsa == NULL))
1238                                 {
1239                                 al=SSL_AD_HANDSHAKE_FAILURE;
1240                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1241                                 goto f_err;
1242                                 }
1243                         rsa=pkey->pkey.rsa;
1244                         }
1245
1246                 /* TLS */
1247                 if (s->version > SSL3_VERSION)
1248                         {
1249                         n2s(p,i);
1250                         if (n != i+2)
1251                                 {
1252                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1253                                         {
1254                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1255                                         goto err;
1256                                         }
1257                                 else
1258                                         p-=2;
1259                                 }
1260                         else
1261                                 n=i;
1262                         }
1263
1264                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1265
1266 #if 1
1267                 /* If a bad decrypt, use a random master key */
1268                 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1269                         ((p[0] != (s->version>>8)) ||
1270                          (p[1] != (s->version & 0xff))))
1271                         {
1272                         p[0]=(s->version>>8);
1273                         p[1]=(s->version & 0xff);
1274                         RAND_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1275                         i=SSL_MAX_MASTER_KEY_LENGTH;
1276                         }
1277 #else
1278                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1279                         {
1280                         al=SSL_AD_DECODE_ERROR;
1281                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1282                         goto f_err;
1283                         }
1284
1285                 if ((p[0] != (s->version>>8)) || (p[1] != (s->version & 0xff)))
1286                         {
1287                         al=SSL_AD_DECODE_ERROR;
1288                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1289                         goto f_err;
1290                         }
1291 #endif
1292
1293                 s->session->master_key_length=
1294                         s->method->ssl3_enc->generate_master_secret(s,
1295                                 s->session->master_key,
1296                                 p,i);
1297                 memset(p,0,i);
1298                 }
1299         else
1300 #endif
1301 #ifndef NO_DH
1302                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1303                 {
1304                 n2s(p,i);
1305                 if (n != i+2)
1306                         {
1307                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1308                                 {
1309                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1310                                 goto err;
1311                                 }
1312                         else
1313                                 {
1314                                 p-=2;
1315                                 i=(int)n;
1316                                 }
1317                         }
1318
1319                 if (n == 0L) /* the parameters are in the cert */
1320                         {
1321                         al=SSL_AD_HANDSHAKE_FAILURE;
1322                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1323                         goto f_err;
1324                         }
1325                 else
1326                         {
1327                         if (s->s3->tmp.dh == NULL)
1328                                 {
1329                                 al=SSL_AD_HANDSHAKE_FAILURE;
1330                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1331                                 goto f_err;
1332                                 }
1333                         else
1334                                 dh_srvr=s->s3->tmp.dh;
1335                         }
1336
1337                 pub=BN_bin2bn(p,i,NULL);
1338                 if (pub == NULL)
1339                         {
1340                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1341                         goto err;
1342                         }
1343
1344                 i=DH_compute_key(p,pub,dh_srvr);
1345
1346                 if (i <= 0)
1347                         {
1348                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1349                         goto err;
1350                         }
1351
1352                 DH_free(s->s3->tmp.dh);
1353                 s->s3->tmp.dh=NULL;
1354
1355                 BN_clear_free(pub);
1356                 pub=NULL;
1357                 s->session->master_key_length=
1358                         s->method->ssl3_enc->generate_master_secret(s,
1359                                 s->session->master_key,p,i);
1360                 }
1361         else
1362 #endif
1363                 {
1364                 al=SSL_AD_HANDSHAKE_FAILURE;
1365                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1366                 goto f_err;
1367                 }
1368
1369         return(1);
1370 f_err:
1371         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1372 #if !defined(NO_DH) || !defined(NO_RSA)
1373 err:
1374 #endif
1375         return(-1);
1376         }
1377
1378 static int ssl3_get_cert_verify(s)
1379 SSL *s;
1380         {
1381         EVP_PKEY *pkey=NULL;
1382         unsigned char *p;
1383         int al,ok,ret=0;
1384         long n;
1385         int type=0,i,j;
1386         X509 *peer;
1387
1388         n=ssl3_get_message(s,
1389                 SSL3_ST_SR_CERT_VRFY_A,
1390                 SSL3_ST_SR_CERT_VRFY_B,
1391                 -1,
1392                 512, /* 512? */
1393                 &ok);
1394
1395         if (!ok) return((int)n);
1396
1397         if (s->session->peer != NULL)
1398                 {
1399                 peer=s->session->peer;
1400                 pkey=X509_get_pubkey(peer);
1401                 type=X509_certificate_type(peer,pkey);
1402                 }
1403         else
1404                 {
1405                 peer=NULL;
1406                 pkey=NULL;
1407                 }
1408
1409         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1410                 {
1411                 s->s3->tmp.reuse_message=1;
1412                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1413                         {
1414                         al=SSL_AD_UNEXPECTED_MESSAGE;
1415                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1416                         goto f_err;
1417                         }
1418                 ret=1;
1419                 goto end;
1420                 }
1421
1422         if (peer == NULL)
1423                 {
1424                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1425                 al=SSL_AD_UNEXPECTED_MESSAGE;
1426                 goto f_err;
1427                 }
1428
1429         if (!(type & EVP_PKT_SIGN))
1430                 {
1431                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1432                 al=SSL_AD_ILLEGAL_PARAMETER;
1433                 goto f_err;
1434                 }
1435
1436         if (s->s3->change_cipher_spec)
1437                 {
1438                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1439                 al=SSL_AD_UNEXPECTED_MESSAGE;
1440                 goto f_err;
1441                 }
1442
1443         /* we now have a signature that we need to verify */
1444         p=(unsigned char *)s->init_buf->data;
1445         n2s(p,i);
1446         n-=2;
1447         if (i > n)
1448                 {
1449                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1450                 al=SSL_AD_DECODE_ERROR;
1451                 goto f_err;
1452                 }
1453
1454         j=EVP_PKEY_size(pkey);
1455         if ((i > j) || (n > j) || (n <= 0))
1456                 {
1457                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1458                 al=SSL_AD_DECODE_ERROR;
1459                 goto f_err;
1460                 }
1461
1462 #ifndef NO_RSA
1463         if (pkey->type == EVP_PKEY_RSA)
1464                 {
1465                 i=RSA_public_decrypt(i,p,p,pkey->pkey.rsa,RSA_PKCS1_PADDING);
1466                 if (i < 0)
1467                         {
1468                         al=SSL_AD_DECRYPT_ERROR;
1469                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1470                         goto f_err;
1471                         }
1472                 if ((i != (MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH)) ||
1473                         memcmp(&(s->s3->tmp.finish_md[0]),p,
1474                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH))
1475                         {
1476                         al=SSL_AD_DECRYPT_ERROR;
1477                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1478                         goto f_err;
1479                         }
1480                 }
1481         else
1482 #endif
1483 #ifndef NO_DSA
1484                 if (pkey->type == EVP_PKEY_DSA)
1485                 {
1486                 j=DSA_verify(pkey->save_type,
1487                         &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]),
1488                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1489                 if (j <= 0)
1490                         {
1491                         /* bad signature */
1492                         al=SSL_AD_DECRYPT_ERROR;
1493                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1494                         goto f_err;
1495                         }
1496                 }
1497         else
1498 #endif
1499                 {
1500                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1501                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1502                 goto f_err;
1503                 }
1504
1505
1506         ret=1;
1507         if (0)
1508                 {
1509 f_err:
1510                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1511                 }
1512 end:
1513         EVP_PKEY_free(pkey);
1514         return(ret);
1515         }
1516
1517 static int ssl3_get_client_certificate(s)
1518 SSL *s;
1519         {
1520         int i,ok,al,ret= -1;
1521         X509 *x=NULL;
1522         unsigned long l,nc,llen,n;
1523         unsigned char *p,*d,*q;
1524         STACK *sk=NULL;
1525
1526         n=ssl3_get_message(s,
1527                 SSL3_ST_SR_CERT_A,
1528                 SSL3_ST_SR_CERT_B,
1529                 -1,
1530 #if defined(MSDOS) && !defined(WIN32)
1531                 1024*30, /* 30k max cert list :-) */
1532 #else
1533                 1024*100, /* 100k max cert list :-) */
1534 #endif
1535                 &ok);
1536
1537         if (!ok) return((int)n);
1538
1539         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1540                 {
1541                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1542                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1543                         {
1544                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1545                         al=SSL_AD_HANDSHAKE_FAILURE;
1546                         goto f_err;
1547                         }
1548                 /* If tls asked for a client cert we must return a 0 list */
1549                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1550                         {
1551                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1552                         al=SSL_AD_UNEXPECTED_MESSAGE;
1553                         goto f_err;
1554                         }
1555                 s->s3->tmp.reuse_message=1;
1556                 return(1);
1557                 }
1558
1559         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1560                 {
1561                 al=SSL_AD_UNEXPECTED_MESSAGE;
1562                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1563                 goto f_err;
1564                 }
1565         d=p=(unsigned char *)s->init_buf->data;
1566
1567         if ((sk=sk_new_null()) == NULL)
1568                 {
1569                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1570                 goto err;
1571                 }
1572
1573         n2l3(p,llen);
1574         if (llen+3 != n)
1575                 {
1576                 al=SSL_AD_DECODE_ERROR;
1577                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1578                 goto f_err;
1579                 }
1580         for (nc=0; nc<llen; )
1581                 {
1582                 n2l3(p,l);
1583                 if ((l+nc+3) > llen)
1584                         {
1585                         al=SSL_AD_DECODE_ERROR;
1586                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1587                         goto f_err;
1588                         }
1589
1590                 q=p;
1591                 x=d2i_X509(NULL,&p,l);
1592                 if (x == NULL)
1593                         {
1594                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1595                         goto err;
1596                         }
1597                 if (p != (q+l))
1598                         {
1599                         al=SSL_AD_DECODE_ERROR;
1600                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1601                         goto f_err;
1602                         }
1603                 if (!sk_push(sk,(char *)x))
1604                         {
1605                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1606                         goto err;
1607                         }
1608                 x=NULL;
1609                 nc+=l+3;
1610                 }
1611
1612         if (sk_num(sk) <= 0)
1613                 {
1614                 /* TLS does not mind 0 certs returned */
1615                 if (s->version == SSL3_VERSION)
1616                         {
1617                         al=SSL_AD_HANDSHAKE_FAILURE;
1618                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1619                         goto f_err;
1620                         }
1621                 /* Fail for TLS only if we required a certificate */
1622                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1623                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1624                         {
1625                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1626                         al=SSL_AD_HANDSHAKE_FAILURE;
1627                         goto f_err;
1628                         }
1629                 }
1630         else
1631                 {
1632                 i=ssl_verify_cert_chain(s,sk);
1633                 if (!i)
1634                         {
1635                         al=ssl_verify_alarm_type(s->verify_result);
1636                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1637                         goto f_err;
1638                         }
1639                 }
1640
1641         /* This should not be needed */
1642         if (s->session->peer != NULL)
1643                 X509_free(s->session->peer);
1644         s->session->peer=(X509 *)sk_shift(sk);
1645
1646         ret=1;
1647         if (0)
1648                 {
1649 f_err:
1650                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1651                 }
1652 err:
1653         if (x != NULL) X509_free(x);
1654         if (sk != NULL) sk_pop_free(sk,X509_free);
1655         return(ret);
1656         }
1657
1658 int ssl3_send_server_certificate(s)
1659 SSL *s;
1660         {
1661         unsigned long l;
1662         X509 *x;
1663
1664         if (s->state == SSL3_ST_SW_CERT_A)
1665                 {
1666                 x=ssl_get_server_send_cert(s);
1667                 if (x == NULL)
1668                         {
1669                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1670                         return(0);
1671                         }
1672
1673                 l=ssl3_output_cert_chain(s,x);
1674                 s->state=SSL3_ST_SW_CERT_B;
1675                 s->init_num=(int)l;
1676                 s->init_off=0;
1677                 }
1678
1679         /* SSL3_ST_SW_CERT_B */
1680         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1681         }