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(int ver)
 105         {
 106         if (ver == SSL3_VERSION)
 107                 return(SSLv3_server_method());
 108         else
 109                 return(NULL);
 110         }
 111
 112 SSL_METHOD *SSLv3_server_method(void)
 113         {
 114         static int init=1;
 115         static SSL_METHOD SSLv3_server_data;
 116
 117         if (init)
 118                 {
 119                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 120                         sizeof(SSL_METHOD));
 121                 SSLv3_server_data.ssl_accept=ssl3_accept;
 122                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 123                 init=0;
 124                 }
 125         return(&SSLv3_server_data);
 126         }
 127
 128 int ssl3_accept(SSL *s)
 129         {
 130         BUF_MEM *buf;
 131         unsigned long l,Time=time(NULL);
 132         void (*cb)()=NULL;
 133         long num1;
 134         int ret= -1;
 135         CERT *ct;
 136         int new_state,state,skip=0;
 137
 138         RAND_seed(&Time,sizeof(Time));
 139         ERR_clear_error();
 140         clear_sys_error();
 141
 142         if (s->info_callback != NULL)
 143                 cb=s->info_callback;
 144         else if (s->ctx->info_callback != NULL)
 145                 cb=s->ctx->info_callback;
 146
 147         /* init things to blank */
 148         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 149         s->in_handshake++;
 150
 151 #ifdef undef
 152         /* FIX THIS EAY EAY EAY */
 153         /* we don't actually need a cert, we just need a cert or a DH_tmp */
 154         if (((s->session == NULL) || (s->session->cert == NULL)) &&
 155                 (s->cert == NULL))
 156                 {
 157                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 158                 ret= -1;
 159                 goto end;
 160                 }
 161 #endif
 162
 163         for (;;)
 164                 {
 165                 state=s->state;
 166
 167                 switch (s->state)
 168                         {
 169                 case SSL_ST_RENEGOTIATE:
 170                         s->new_session=1;
 171                         /* s->state=SSL_ST_ACCEPT; */
 172
 173                 case SSL_ST_BEFORE:
 174                 case SSL_ST_ACCEPT:
 175                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 176                 case SSL_ST_OK|SSL_ST_ACCEPT:
 177
 178                         s->server=1;
 179                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 180
 181                         if ((s->version>>8) != 3)
 182                                 abort();
 183                         /* s->version=SSL3_VERSION; */
 184                         s->type=SSL_ST_ACCEPT;
 185
 186                         if (s->init_buf == NULL)
 187                                 {
 188                                 if ((buf=BUF_MEM_new()) == NULL)
 189                                         {
 190                                         ret= -1;
 191                                         goto end;
 192                                         }
 193                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 194                                         {
 195                                         ret= -1;
 196                                         goto end;
 197                                         }
 198                                 s->init_buf=buf;
 199                                 }
 200
 201                         if (!ssl3_setup_buffers(s))
 202                                 {
 203                                 ret= -1;
 204                                 goto end;
 205                                 }
 206
 207                         /* Ok, we now need to push on a buffering BIO so that
 208                          * the output is sent in a way that TCP likes :-)
 209                          */
 210                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 211
 212                         s->init_num=0;
 213
 214                         if (s->state != SSL_ST_RENEGOTIATE)
 215                                 {
 216                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 217                                 ssl3_init_finished_mac(s);
 218                                 s->ctx->stats.sess_accept++;
 219                                 }
 220                         else
 221                                 {
 222                                 s->ctx->stats.sess_accept_renegotiate++;
 223                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 224                                 }
 225                         break;
 226
 227                 case SSL3_ST_SW_HELLO_REQ_A:
 228                 case SSL3_ST_SW_HELLO_REQ_B:
 229
 230                         s->shutdown=0;
 231                         ret=ssl3_send_hello_request(s);
 232                         if (ret <= 0) goto end;
 233                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 234                         s->state=SSL3_ST_SW_FLUSH;
 235                         s->init_num=0;
 236
 237                         ssl3_init_finished_mac(s);
 238                         break;
 239
 240                 case SSL3_ST_SW_HELLO_REQ_C:
 241                         s->state=SSL_ST_OK;
 242                         ret=1;
 243                         goto end;
 244                         /* break; */
 245
 246                 case SSL3_ST_SR_CLNT_HELLO_A:
 247                 case SSL3_ST_SR_CLNT_HELLO_B:
 248                 case SSL3_ST_SR_CLNT_HELLO_C:
 249
 250                         s->shutdown=0;
 251                         ret=ssl3_get_client_hello(s);
 252                         if (ret <= 0) goto end;
 253                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 254                         s->init_num=0;
 255                         break;
 256
 257                 case SSL3_ST_SW_SRVR_HELLO_A:
 258                 case SSL3_ST_SW_SRVR_HELLO_B:
 259                         ret=ssl3_send_server_hello(s);
 260                         if (ret <= 0) goto end;
 261
 262                         if (s->hit)
 263                                 s->state=SSL3_ST_SW_CHANGE_A;
 264                         else
 265                                 s->state=SSL3_ST_SW_CERT_A;
 266                         s->init_num=0;
 267                         break;
 268
 269                 case SSL3_ST_SW_CERT_A:
 270                 case SSL3_ST_SW_CERT_B:
 271                         /* Check if it is anon DH */
 272                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 273                                 {
 274                                 ret=ssl3_send_server_certificate(s);
 275                                 if (ret <= 0) goto end;
 276                                 }
 277                         else
 278                                 skip=1;
 279                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 280                         s->init_num=0;
 281                         break;
 282
 283                 case SSL3_ST_SW_KEY_EXCH_A:
 284                 case SSL3_ST_SW_KEY_EXCH_B:
 285                         l=s->s3->tmp.new_cipher->algorithms;
 286                         if (s->session->cert == NULL)
 287                                 {
 288                                 if (s->cert != NULL)
 289                                         {
 290                                         CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
 291                                         s->session->cert=s->cert;
 292                                         }
 293                                 else
 294                                         {
 295                                         CRYPTO_add(&s->ctx->default_cert->references,1,CRYPTO_LOCK_SSL_CERT);
 296                                         s->session->cert=s->ctx->default_cert;
 297                                         }
 298                                 }
 299                         ct=s->session->cert;
 300
 301                         /* clear this, it may get reset by
 302                          * send_server_key_exchange */
 303                         if (s->options & SSL_OP_EPHEMERAL_RSA)
 304                                 s->s3->tmp.use_rsa_tmp=1;
 305                         else
 306                                 s->s3->tmp.use_rsa_tmp=0;
 307
 308                         /* only send if a DH key exchange, fortezza or
 309                          * RSA but we have a sign only certificate */
 310                         if (s->s3->tmp.use_rsa_tmp
 311                             || (l & (SSL_DH|SSL_kFZA))
 312                             || ((l & SSL_kRSA)
 313                                 && (ct->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 314                                     || (SSL_IS_EXPORT(l)
 315                                         && EVP_PKEY_size(ct->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_EXPORT_PKEYLENGTH(l)
 316                                         )
 317                                     )
 318                                 )
 319                             )
 320                                 {
 321                                 ret=ssl3_send_server_key_exchange(s);
 322                                 if (ret <= 0) goto end;
 323                                 }
 324                         else
 325                                 skip=1;
 326
 327                         s->state=SSL3_ST_SW_CERT_REQ_A;
 328                         s->init_num=0;
 329                         break;
 330
 331                 case SSL3_ST_SW_CERT_REQ_A:
 332                 case SSL3_ST_SW_CERT_REQ_B:
 333                         if (!(s->verify_mode & SSL_VERIFY_PEER) ||
 334                                 ((s->session->peer != NULL) &&
 335                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
 336                                 {
 337                                 /* no cert request */
 338                                 skip=1;
 339                                 s->s3->tmp.cert_request=0;
 340                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 341                                 }
 342                         else
 343                                 {
 344                                 s->s3->tmp.cert_request=1;
 345                                 ret=ssl3_send_certificate_request(s);
 346                                 if (ret <= 0) goto end;
 347                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 348                                 s->init_num=0;
 349                                 }
 350                         break;
 351
 352                 case SSL3_ST_SW_SRVR_DONE_A:
 353                 case SSL3_ST_SW_SRVR_DONE_B:
 354                         ret=ssl3_send_server_done(s);
 355                         if (ret <= 0) goto end;
 356                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 357                         s->state=SSL3_ST_SW_FLUSH;
 358                         s->init_num=0;
 359                         break;
 360
 361                 case SSL3_ST_SW_FLUSH:
 362                         /* number of bytes to be flushed */
 363                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 364                         if (num1 > 0)
 365                                 {
 366                                 s->rwstate=SSL_WRITING;
 367                                 num1=BIO_flush(s->wbio);
 368                                 if (num1 <= 0) { ret= -1; goto end; }
 369                                 s->rwstate=SSL_NOTHING;
 370                                 }
 371
 372                         s->state=s->s3->tmp.next_state;
 373                         break;
 374
 375                 case SSL3_ST_SR_CERT_A:
 376                 case SSL3_ST_SR_CERT_B:
 377                         /* could be sent for a DH cert, even if we
 378                          * have not asked for it :-) */
 379                         ret=ssl3_get_client_certificate(s);
 380                         if (ret <= 0) goto end;
 381                         s->init_num=0;
 382                         s->state=SSL3_ST_SR_KEY_EXCH_A;
 383                         break;
 384
 385                 case SSL3_ST_SR_KEY_EXCH_A:
 386                 case SSL3_ST_SR_KEY_EXCH_B:
 387                         ret=ssl3_get_client_key_exchange(s);
 388                         if (ret <= 0) goto end;
 389                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 390                         s->init_num=0;
 391
 392                         /* We need to get hashes here so if there is
 393                          * a client cert, it can be verified */
 394                         s->method->ssl3_enc->cert_verify_mac(s,
 395                                 &(s->s3->finish_dgst1),
 396                                 &(s->s3->tmp.finish_md[0]));
 397                         s->method->ssl3_enc->cert_verify_mac(s,
 398                                 &(s->s3->finish_dgst2),
 399                                 &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]));
 400
 401                         break;
 402
 403                 case SSL3_ST_SR_CERT_VRFY_A:
 404                 case SSL3_ST_SR_CERT_VRFY_B:
 405
 406                         /* we should decide if we expected this one */
 407                         ret=ssl3_get_cert_verify(s);
 408                         if (ret <= 0) goto end;
 409
 410                         s->state=SSL3_ST_SR_FINISHED_A;
 411                         s->init_num=0;
 412                         break;
 413
 414                 case SSL3_ST_SR_FINISHED_A:
 415                 case SSL3_ST_SR_FINISHED_B:
 416                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 417                                 SSL3_ST_SR_FINISHED_B);
 418                         if (ret <= 0) goto end;
 419                         if (s->hit)
 420                                 s->state=SSL_ST_OK;
 421                         else
 422                                 s->state=SSL3_ST_SW_CHANGE_A;
 423                         s->init_num=0;
 424                         break;
 425
 426                 case SSL3_ST_SW_CHANGE_A:
 427                 case SSL3_ST_SW_CHANGE_B:
 428
 429                         s->session->cipher=s->s3->tmp.new_cipher;
 430                         if (!s->method->ssl3_enc->setup_key_block(s))
 431                                 { ret= -1; goto end; }
 432
 433                         ret=ssl3_send_change_cipher_spec(s,
 434                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 435
 436                         if (ret <= 0) goto end;
 437                         s->state=SSL3_ST_SW_FINISHED_A;
 438                         s->init_num=0;
 439
 440                         if (!s->method->ssl3_enc->change_cipher_state(s,
 441                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 442                                 {
 443                                 ret= -1;
 444                                 goto end;
 445                                 }
 446
 447                         break;
 448
 449                 case SSL3_ST_SW_FINISHED_A:
 450                 case SSL3_ST_SW_FINISHED_B:
 451                         ret=ssl3_send_finished(s,
 452                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 453                                 s->method->ssl3_enc->server_finished,
 454                                 s->method->ssl3_enc->server_finished_len);
 455                         if (ret <= 0) goto end;
 456                         s->state=SSL3_ST_SW_FLUSH;
 457                         if (s->hit)
 458                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 459                         else
 460                                 s->s3->tmp.next_state=SSL_ST_OK;
 461                         s->init_num=0;
 462                         break;
 463
 464                 case SSL_ST_OK:
 465                         /* clean a few things up */
 466                         ssl3_cleanup_key_block(s);
 467
 468                         BUF_MEM_free(s->init_buf);
 469                         s->init_buf=NULL;
 470
 471                         /* remove buffering on output */
 472                         ssl_free_wbio_buffer(s);
 473
 474                         s->new_session=0;
 475                         s->init_num=0;
 476
 477                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 478
 479                         s->ctx->stats.sess_accept_good++;
 480                         /* s->server=1; */
 481                         s->handshake_func=ssl3_accept;
 482                         ret=1;
 483
 484                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 485
 486                         goto end;
 487                         /* break; */
 488
 489                 default:
 490                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 491                         ret= -1;
 492                         goto end;
 493                         /* break; */
 494                         }
 495
 496                 if (!s->s3->tmp.reuse_message && !skip)
 497                         {
 498                         if (s->debug)
 499                                 {
 500                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 501                                         goto end;
 502                                 }
 503
 504
 505                         if ((cb != NULL) && (s->state != state))
 506                                 {
 507                                 new_state=s->state;
 508                                 s->state=state;
 509                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 510                                 s->state=new_state;
 511                                 }
 512                         }
 513                 skip=0;
 514                 }
 515 end:
 516         /* BIO_flush(s->wbio); */
 517
 518         if (cb != NULL)
 519                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 520         s->in_handshake--;
 521         return(ret);
 522         }
 523
 524 static int ssl3_send_hello_request(SSL *s)
 525         {
 526         unsigned char *p;
 527
 528         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 529                 {
 530                 p=(unsigned char *)s->init_buf->data;
 531                 *(p++)=SSL3_MT_CLIENT_REQUEST;
 532                 *(p++)=0;
 533                 *(p++)=0;
 534                 *(p++)=0;
 535
 536                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 537                 /* number of bytes to write */
 538                 s->init_num=4;
 539                 s->init_off=0;
 540                 }
 541
 542         /* SSL3_ST_SW_HELLO_REQ_B */
 543         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 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         /* The version number has already been checked in ssl3_get_message.
 578          * I a native TLSv1/SSLv3 method, the match must be correct except
 579          * perhaps for the first message */
 580 /*      s->client_version=(((int)p[0])<<8)|(int)p[1]; */
 581         p+=2;
 582
 583         /* load the client random */
 584         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 585         p+=SSL3_RANDOM_SIZE;
 586
 587         /* get the session-id */
 588         j= *(p++);
 589
 590         s->hit=0;
 591         if (j == 0)
 592                 {
 593                 if (!ssl_get_new_session(s,1))
 594                         goto err;
 595                 }
 596         else
 597                 {
 598                 i=ssl_get_prev_session(s,p,j);
 599                 if (i == 1)
 600                         { /* previous session */
 601                         s->hit=1;
 602                         }
 603                 else
 604                         {
 605                         if (!ssl_get_new_session(s,1))
 606                                 goto err;
 607                         }
 608                 }
 609
 610         p+=j;
 611         n2s(p,i);
 612         if ((i == 0) && (j != 0))
 613                 {
 614                 /* we need a cipher if we are not resuming a session */
 615                 al=SSL_AD_ILLEGAL_PARAMETER;
 616                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 617                 goto f_err;
 618                 }
 619         if ((i+p) > (d+n))
 620                 {
 621                 /* not enough data */
 622                 al=SSL_AD_DECODE_ERROR;
 623                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 624                 goto f_err;
 625                 }
 626         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 627                 == NULL))
 628                 {
 629                 goto err;
 630                 }
 631         p+=i;
 632
 633         /* If it is a hit, check that the cipher is in the list */
 634         if ((s->hit) && (i > 0))
 635                 {
 636                 j=0;
 637                 id=s->session->cipher->id;
 638
 639 #ifdef CIPHER_DEBUG
 640                 printf("client sent %d ciphers\n",sk_num(ciphers));
 641 #endif
 642                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 643                         {
 644                         c=sk_SSL_CIPHER_value(ciphers,i);
 645 #ifdef CIPHER_DEBUG
 646                         printf("client [%2d of %2d]:%s\n",
 647                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 648 #endif
 649                         if (c->id == id)
 650                                 {
 651                                 j=1;
 652                                 break;
 653                                 }
 654                         }
 655                 if (j == 0)
 656                         {
 657                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 658                                 {
 659                                 /* Very bad for multi-threading.... */
 660                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 661                                                                        0);
 662                                 }
 663                         else
 664                                 {
 665                                 /* we need to have the cipher in the cipher
 666                                  * list if we are asked to reuse it */
 667                                 al=SSL_AD_ILLEGAL_PARAMETER;
 668                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 669                                 goto f_err;
 670                                 }
 671                         }
 672                 }
 673
 674         /* compression */
 675         i= *(p++);
 676         q=p;
 677         for (j=0; j<i; j++)
 678                 {
 679                 if (p[j] == 0) break;
 680                 }
 681
 682         p+=i;
 683         if (j >= i)
 684                 {
 685                 /* no compress */
 686                 al=SSL_AD_DECODE_ERROR;
 687                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 688                 goto f_err;
 689                 }
 690
 691         /* Worst case, we will use the NULL compression, but if we have other
 692          * options, we will now look for them.  We have i-1 compression
 693          * algorithms from the client, starting at q. */
 694         s->s3->tmp.new_compression=NULL;
 695         if (s->ctx->comp_methods != NULL)
 696                 { /* See if we have a match */
 697                 int m,nn,o,v,done=0;
 698
 699                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 700                 for (m=0; m<nn; m++)
 701                         {
 702                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 703                         v=comp->id;
 704                         for (o=0; o<i; o++)
 705                                 {
 706                                 if (v == q[o])
 707                                         {
 708                                         done=1;
 709                                         break;
 710                                         }
 711                                 }
 712                         if (done) break;
 713                         }
 714                 if (done)
 715                         s->s3->tmp.new_compression=comp;
 716                 else
 717                         comp=NULL;
 718                 }
 719
 720         /* TLS does not mind if there is extra stuff */
 721         if (s->version == SSL3_VERSION)
 722                 {
 723                 if (p > (d+n))
 724                         {
 725                         /* wrong number of bytes,
 726                          * there could be more to follow */
 727                         al=SSL_AD_DECODE_ERROR;
 728                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 729                         goto f_err;
 730                         }
 731                 }
 732
 733         /* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
 734          * pick a cipher */
 735
 736         if (!s->hit)
 737                 {
 738                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 739                 if (s->session->ciphers != NULL)
 740                         sk_SSL_CIPHER_free(s->session->ciphers);
 741                 s->session->ciphers=ciphers;
 742                 if (ciphers == NULL)
 743                         {
 744                         al=SSL_AD_ILLEGAL_PARAMETER;
 745                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 746                         goto f_err;
 747                         }
 748                 ciphers=NULL;
 749                 c=ssl3_choose_cipher(s,s->session->ciphers,
 750                                      ssl_get_ciphers_by_id(s));
 751
 752                 if (c == NULL)
 753                         {
 754                         al=SSL_AD_HANDSHAKE_FAILURE;
 755                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 756                         goto f_err;
 757                         }
 758                 s->s3->tmp.new_cipher=c;
 759                 }
 760         else
 761                 {
 762                 /* Session-id reuse */
 763 #ifdef REUSE_CIPHER_BUG
 764                 STACK_OF(SSL_CIPHER) *sk;
 765                 SSL_CIPHER *nc=NULL;
 766                 SSL_CIPHER *ec=NULL;
 767
 768                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 769                         {
 770                         sk=s->session->ciphers;
 771                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 772                                 {
 773                                 c=sk_SSL_CIPHER_value(sk,i);
 774                                 if (c->algorithms & SSL_eNULL)
 775                                         nc=c;
 776                                 if (SSL_C_IS_EXPORT(c))
 777                                         ec=c;
 778                                 }
 779                         if (nc != NULL)
 780                                 s->s3->tmp.new_cipher=nc;
 781                         else if (ec != NULL)
 782                                 s->s3->tmp.new_cipher=ec;
 783                         else
 784                                 s->s3->tmp.new_cipher=s->session->cipher;
 785                         }
 786                 else
 787 #endif
 788                 s->s3->tmp.new_cipher=s->session->cipher;
 789                 }
 790
 791         /* we now have the following setup.
 792          * client_random
 793          * cipher_list          - our prefered list of ciphers
 794          * ciphers              - the clients prefered list of ciphers
 795          * compression          - basically ignored right now
 796          * ssl version is set   - sslv3
 797          * s->session           - The ssl session has been setup.
 798          * s->hit               - sesson reuse flag
 799          * s->tmp.new_cipher    - the new cipher to use.
 800          */
 801
 802         ret=1;
 803         if (0)
 804                 {
 805 f_err:
 806                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 807                 }
 808 err:
 809         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 810         return(ret);
 811         }
 812
 813 static int ssl3_send_server_hello(SSL *s)
 814         {
 815         unsigned char *buf;
 816         unsigned char *p,*d;
 817         int i,sl;
 818         unsigned long l,Time;
 819
 820         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 821                 {
 822                 buf=(unsigned char *)s->init_buf->data;
 823                 p=s->s3->server_random;
 824                 Time=time(NULL);                        /* Time */
 825                 l2n(Time,p);
 826                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 827                 /* Do the message type and length last */
 828                 d=p= &(buf[4]);
 829
 830                 *(p++)=s->version>>8;
 831                 *(p++)=s->version&0xff;
 832
 833                 /* Random stuff */
 834                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 835                 p+=SSL3_RANDOM_SIZE;
 836
 837                 /* now in theory we have 3 options to sending back the
 838                  * session id.  If it is a re-use, we send back the
 839                  * old session-id, if it is a new session, we send
 840                  * back the new session-id or we send back a 0 length
 841                  * session-id if we want it to be single use.
 842                  * Currently I will not implement the '0' length session-id
 843                  * 12-Jan-98 - I'll now support the '0' length stuff.
 844                  */
 845                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 846                         s->session->session_id_length=0;
 847
 848                 sl=s->session->session_id_length;
 849                 *(p++)=sl;
 850                 memcpy(p,s->session->session_id,sl);
 851                 p+=sl;
 852
 853                 /* put the cipher */
 854                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 855                 p+=i;
 856
 857                 /* put the compression method */
 858                 if (s->s3->tmp.new_compression == NULL)
 859                         *(p++)=0;
 860                 else
 861                         *(p++)=s->s3->tmp.new_compression->id;
 862
 863                 /* do the header */
 864                 l=(p-d);
 865                 d=buf;
 866                 *(d++)=SSL3_MT_SERVER_HELLO;
 867                 l2n3(l,d);
 868
 869                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 870                 /* number of bytes to write */
 871                 s->init_num=p-buf;
 872                 s->init_off=0;
 873                 }
 874
 875         /* SSL3_ST_CW_CLNT_HELLO_B */
 876         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 877         }
 878
 879 static int ssl3_send_server_done(SSL *s)
 880         {
 881         unsigned char *p;
 882
 883         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 884                 {
 885                 p=(unsigned char *)s->init_buf->data;
 886
 887                 /* do the header */
 888                 *(p++)=SSL3_MT_SERVER_DONE;
 889                 *(p++)=0;
 890                 *(p++)=0;
 891                 *(p++)=0;
 892
 893                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 894                 /* number of bytes to write */
 895                 s->init_num=4;
 896                 s->init_off=0;
 897                 }
 898
 899         /* SSL3_ST_CW_CLNT_HELLO_B */
 900         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 901         }
 902
 903 static int ssl3_send_server_key_exchange(SSL *s)
 904         {
 905 #ifndef NO_RSA
 906         unsigned char *q;
 907         int j,num;
 908         RSA *rsa;
 909         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 910 #endif
 911 #ifndef NO_DH
 912         DH *dh,*dhp;
 913 #endif
 914         EVP_PKEY *pkey;
 915         unsigned char *p,*d;
 916         int al,i;
 917         unsigned long type;
 918         int n;
 919         CERT *cert;
 920         BIGNUM *r[4];
 921         int nr[4],kn;
 922         BUF_MEM *buf;
 923         EVP_MD_CTX md_ctx;
 924
 925         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 926                 {
 927                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 928                 cert=s->session->cert;
 929
 930                 buf=s->init_buf;
 931
 932                 r[0]=r[1]=r[2]=r[3]=NULL;
 933                 n=0;
 934 #ifndef NO_RSA
 935                 if (type & SSL_kRSA)
 936                         {
 937                         rsa=cert->rsa_tmp;
 938                         if ((rsa == NULL) && (s->ctx->default_cert->rsa_tmp_cb != NULL))
 939                                 {
 940                                 rsa=s->ctx->default_cert->rsa_tmp_cb(s,
 941                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 942                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 943                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 944                                 cert->rsa_tmp=rsa;
 945                                 }
 946                         if (rsa == NULL)
 947                                 {
 948                                 al=SSL_AD_HANDSHAKE_FAILURE;
 949                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 950                                 goto f_err;
 951                                 }
 952                         r[0]=rsa->n;
 953                         r[1]=rsa->e;
 954                         s->s3->tmp.use_rsa_tmp=1;
 955                         }
 956                 else
 957 #endif
 958 #ifndef NO_DH
 959                         if (type & SSL_kEDH)
 960                         {
 961                         dhp=cert->dh_tmp;
 962                         if ((dhp == NULL) && (cert->dh_tmp_cb != NULL))
 963                                 dhp=cert->dh_tmp_cb(s,
 964                                       !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 965                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 966                         if (dhp == NULL)
 967                                 {
 968                                 al=SSL_AD_HANDSHAKE_FAILURE;
 969                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 970                                 goto f_err;
 971                                 }
 972                         if ((dh=DHparams_dup(dhp)) == NULL)
 973                                 {
 974                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 975                                 goto err;
 976                                 }
 977
 978                         s->s3->tmp.dh=dh;
 979                         if ((dhp->pub_key == NULL ||
 980                              dhp->priv_key == NULL ||
 981                              (s->options & SSL_OP_SINGLE_DH_USE)))
 982                                 {
 983                                 if(!DH_generate_key(dh))
 984                                     {
 985                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
 986                                            ERR_R_DH_LIB);
 987                                     goto err;
 988                                     }
 989                                 }
 990                         else
 991                                 {
 992                                 dh->pub_key=BN_dup(dhp->pub_key);
 993                                 dh->priv_key=BN_dup(dhp->priv_key);
 994                                 if ((dh->pub_key == NULL) ||
 995                                         (dh->priv_key == NULL))
 996                                         {
 997                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 998                                         goto err;
 999                                         }
1000                                 }
1001                         r[0]=dh->p;
1002                         r[1]=dh->g;
1003                         r[2]=dh->pub_key;
1004                         }
1005                 else
1006 #endif
1007                         {
1008                         al=SSL_AD_HANDSHAKE_FAILURE;
1009                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1010                         goto f_err;
1011                         }
1012                 for (i=0; r[i] != NULL; i++)
1013                         {
1014                         nr[i]=BN_num_bytes(r[i]);
1015                         n+=2+nr[i];
1016                         }
1017
1018                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1019                         {
1020                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1021                                 == NULL)
1022                                 {
1023                                 al=SSL_AD_DECODE_ERROR;
1024                                 goto f_err;
1025                                 }
1026                         kn=EVP_PKEY_size(pkey);
1027                         }
1028                 else
1029                         {
1030                         pkey=NULL;
1031                         kn=0;
1032                         }
1033
1034                 if (!BUF_MEM_grow(buf,n+4+kn))
1035                         {
1036                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1037                         goto err;
1038                         }
1039                 d=(unsigned char *)s->init_buf->data;
1040                 p= &(d[4]);
1041
1042                 for (i=0; r[i] != NULL; i++)
1043                         {
1044                         s2n(nr[i],p);
1045                         BN_bn2bin(r[i],p);
1046                         p+=nr[i];
1047                         }
1048
1049                 /* not anonymous */
1050                 if (pkey != NULL)
1051                         {
1052                         /* n is the length of the params, they start at &(d[4])
1053                          * and p points to the space at the end. */
1054 #ifndef NO_RSA
1055                         if (pkey->type == EVP_PKEY_RSA)
1056                                 {
1057                                 q=md_buf;
1058                                 j=0;
1059                                 for (num=2; num > 0; num--)
1060                                         {
1061                                         EVP_DigestInit(&md_ctx,(num == 2)
1062                                                 ?s->ctx->md5:s->ctx->sha1);
1063                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1064                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1065                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1066                                         EVP_DigestFinal(&md_ctx,q,
1067                                                 (unsigned int *)&i);
1068                                         q+=i;
1069                                         j+=i;
1070                                         }
1071                                 i=RSA_private_encrypt(j,md_buf,&(p[2]),
1072                                         pkey->pkey.rsa,RSA_PKCS1_PADDING);
1073                                 if (i <= 0)
1074                                         {
1075                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1076                                         goto err;
1077                                         }
1078                                 s2n(i,p);
1079                                 n+=i+2;
1080                                 }
1081                         else
1082 #endif
1083 #if !defined(NO_DSA)
1084                                 if (pkey->type == EVP_PKEY_DSA)
1085                                 {
1086                                 /* lets do DSS */
1087                                 EVP_SignInit(&md_ctx,EVP_dss1());
1088                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1089                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1090                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1091                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1092                                         (unsigned int *)&i,pkey))
1093                                         {
1094                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1095                                         goto err;
1096                                         }
1097                                 s2n(i,p);
1098                                 n+=i+2;
1099                                 }
1100                         else
1101 #endif
1102                                 {
1103                                 /* Is this error check actually needed? */
1104                                 al=SSL_AD_HANDSHAKE_FAILURE;
1105                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1106                                 goto f_err;
1107                                 }
1108                         }
1109
1110                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1111                 l2n3(n,d);
1112
1113                 /* we should now have things packed up, so lets send
1114                  * it off */
1115                 s->init_num=n+4;
1116                 s->init_off=0;
1117                 }
1118
1119         /* SSL3_ST_SW_KEY_EXCH_B */
1120         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1121 f_err:
1122         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1123 err:
1124         return(-1);
1125         }
1126
1127 static int ssl3_send_certificate_request(SSL *s)
1128         {
1129         unsigned char *p,*d;
1130         int i,j,nl,off,n;
1131         STACK_OF(X509_NAME) *sk=NULL;
1132         X509_NAME *name;
1133         BUF_MEM *buf;
1134
1135         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1136                 {
1137                 buf=s->init_buf;
1138
1139                 d=p=(unsigned char *)&(buf->data[4]);
1140
1141                 /* get the list of acceptable cert types */
1142                 p++;
1143                 n=ssl3_get_req_cert_type(s,p);
1144                 d[0]=n;
1145                 p+=n;
1146                 n++;
1147
1148                 off=n;
1149                 p+=2;
1150                 n+=2;
1151
1152                 sk=SSL_get_client_CA_list(s);
1153                 nl=0;
1154                 if (sk != NULL)
1155                         {
1156                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1157                                 {
1158                                 name=sk_X509_NAME_value(sk,i);
1159                                 j=i2d_X509_NAME(name,NULL);
1160                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1161                                         {
1162                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1163                                         goto err;
1164                                         }
1165                                 p=(unsigned char *)&(buf->data[4+n]);
1166                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1167                                         {
1168                                         s2n(j,p);
1169                                         i2d_X509_NAME(name,&p);
1170                                         n+=2+j;
1171                                         nl+=2+j;
1172                                         }
1173                                 else
1174                                         {
1175                                         d=p;
1176                                         i2d_X509_NAME(name,&p);
1177                                         j-=2; s2n(j,d); j+=2;
1178                                         n+=j;
1179                                         nl+=j;
1180                                         }
1181                                 }
1182                         }
1183                 /* else no CA names */
1184                 p=(unsigned char *)&(buf->data[4+off]);
1185                 s2n(nl,p);
1186
1187                 d=(unsigned char *)buf->data;
1188                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1189                 l2n3(n,d);
1190
1191                 /* we should now have things packed up, so lets send
1192                  * it off */
1193
1194                 s->init_num=n+4;
1195                 s->init_off=0;
1196                 }
1197
1198         /* SSL3_ST_SW_CERT_REQ_B */
1199         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1200 err:
1201         return(-1);
1202         }
1203
1204 static int ssl3_get_client_key_exchange(SSL *s)
1205         {
1206         int i,al,ok;
1207         long n;
1208         unsigned long l;
1209         unsigned char *p;
1210         RSA *rsa=NULL;
1211         EVP_PKEY *pkey=NULL;
1212 #ifndef NO_DH
1213         BIGNUM *pub=NULL;
1214         DH *dh_srvr;
1215 #endif
1216
1217         n=ssl3_get_message(s,
1218                 SSL3_ST_SR_KEY_EXCH_A,
1219                 SSL3_ST_SR_KEY_EXCH_B,
1220                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1221                 400, /* ???? */
1222                 &ok);
1223
1224         if (!ok) return((int)n);
1225         p=(unsigned char *)s->init_buf->data;
1226
1227         l=s->s3->tmp.new_cipher->algorithms;
1228
1229 #ifndef NO_RSA
1230         if (l & SSL_kRSA)
1231                 {
1232                 /* FIX THIS UP EAY EAY EAY EAY */
1233                 if (s->s3->tmp.use_rsa_tmp)
1234                         {
1235                         if ((s->session->cert != NULL) &&
1236                                 (s->session->cert->rsa_tmp != NULL))
1237                                 rsa=s->session->cert->rsa_tmp;
1238                         else if ((s->ctx->default_cert != NULL) &&
1239                                 (s->ctx->default_cert->rsa_tmp != NULL))
1240                                 rsa=s->ctx->default_cert->rsa_tmp;
1241                         /* Don't do a callback because rsa_tmp should
1242                          * be sent already */
1243                         if (rsa == NULL)
1244                                 {
1245                                 al=SSL_AD_HANDSHAKE_FAILURE;
1246                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1247                                 goto f_err;
1248
1249                                 }
1250                         }
1251                 else
1252                         {
1253                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1254                         if (    (pkey == NULL) ||
1255                                 (pkey->type != EVP_PKEY_RSA) ||
1256                                 (pkey->pkey.rsa == NULL))
1257                                 {
1258                                 al=SSL_AD_HANDSHAKE_FAILURE;
1259                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1260                                 goto f_err;
1261                                 }
1262                         rsa=pkey->pkey.rsa;
1263                         }
1264
1265                 /* TLS */
1266                 if (s->version > SSL3_VERSION)
1267                         {
1268                         n2s(p,i);
1269                         if (n != i+2)
1270                                 {
1271                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1272                                         {
1273                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1274                                         goto err;
1275                                         }
1276                                 else
1277                                         p-=2;
1278                                 }
1279                         else
1280                                 n=i;
1281                         }
1282
1283                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1284
1285 #if 1
1286                 /* If a bad decrypt, use a random master key */
1287                 if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1288                         ((p[0] != (s->client_version>>8)) ||
1289                          (p[1] != (s->client_version & 0xff))))
1290                         {
1291                         int bad=1;
1292
1293                         if ((i == SSL_MAX_MASTER_KEY_LENGTH) &&
1294                                 (p[0] == (s->version>>8)) &&
1295                                 (p[1] == 0))
1296                                 {
1297                                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
1298                                         bad=0;
1299                                 }
1300                         if (bad)
1301                                 {
1302                                 p[0]=(s->version>>8);
1303                                 p[1]=(s->version & 0xff);
1304                                 RAND_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1305                                 i=SSL_MAX_MASTER_KEY_LENGTH;
1306                                 }
1307                         /* else, an SSLeay bug, ssl only server, tls client */
1308                         }
1309 #else
1310                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1311                         {
1312                         al=SSL_AD_DECODE_ERROR;
1313                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1314                         goto f_err;
1315                         }
1316
1317                 if ((p[0] != (s->version>>8)) || (p[1] != (s->version & 0xff)))
1318                         {
1319                         al=SSL_AD_DECODE_ERROR;
1320                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1321                         goto f_err;
1322                         }
1323 #endif
1324
1325                 s->session->master_key_length=
1326                         s->method->ssl3_enc->generate_master_secret(s,
1327                                 s->session->master_key,
1328                                 p,i);
1329                 memset(p,0,i);
1330                 }
1331         else
1332 #endif
1333 #ifndef NO_DH
1334                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1335                 {
1336                 n2s(p,i);
1337                 if (n != i+2)
1338                         {
1339                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1340                                 {
1341                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1342                                 goto err;
1343                                 }
1344                         else
1345                                 {
1346                                 p-=2;
1347                                 i=(int)n;
1348                                 }
1349                         }
1350
1351                 if (n == 0L) /* the parameters are in the cert */
1352                         {
1353                         al=SSL_AD_HANDSHAKE_FAILURE;
1354                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1355                         goto f_err;
1356                         }
1357                 else
1358                         {
1359                         if (s->s3->tmp.dh == NULL)
1360                                 {
1361                                 al=SSL_AD_HANDSHAKE_FAILURE;
1362                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1363                                 goto f_err;
1364                                 }
1365                         else
1366                                 dh_srvr=s->s3->tmp.dh;
1367                         }
1368
1369                 pub=BN_bin2bn(p,i,NULL);
1370                 if (pub == NULL)
1371                         {
1372                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1373                         goto err;
1374                         }
1375
1376                 i=DH_compute_key(p,pub,dh_srvr);
1377
1378                 if (i <= 0)
1379                         {
1380                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1381                         goto err;
1382                         }
1383
1384                 DH_free(s->s3->tmp.dh);
1385                 s->s3->tmp.dh=NULL;
1386
1387                 BN_clear_free(pub);
1388                 pub=NULL;
1389                 s->session->master_key_length=
1390                         s->method->ssl3_enc->generate_master_secret(s,
1391                                 s->session->master_key,p,i);
1392                 }
1393         else
1394 #endif
1395                 {
1396                 al=SSL_AD_HANDSHAKE_FAILURE;
1397                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
1398                 goto f_err;
1399                 }
1400
1401         return(1);
1402 f_err:
1403         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1404 #if !defined(NO_DH) || !defined(NO_RSA)
1405 err:
1406 #endif
1407         return(-1);
1408         }
1409
1410 static int ssl3_get_cert_verify(SSL *s)
1411         {
1412         EVP_PKEY *pkey=NULL;
1413         unsigned char *p;
1414         int al,ok,ret=0;
1415         long n;
1416         int type=0,i,j;
1417         X509 *peer;
1418
1419         n=ssl3_get_message(s,
1420                 SSL3_ST_SR_CERT_VRFY_A,
1421                 SSL3_ST_SR_CERT_VRFY_B,
1422                 -1,
1423                 512, /* 512? */
1424                 &ok);
1425
1426         if (!ok) return((int)n);
1427
1428         if (s->session->peer != NULL)
1429                 {
1430                 peer=s->session->peer;
1431                 pkey=X509_get_pubkey(peer);
1432                 type=X509_certificate_type(peer,pkey);
1433                 }
1434         else
1435                 {
1436                 peer=NULL;
1437                 pkey=NULL;
1438                 }
1439
1440         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1441                 {
1442                 s->s3->tmp.reuse_message=1;
1443                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1444                         {
1445                         al=SSL_AD_UNEXPECTED_MESSAGE;
1446                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1447                         goto f_err;
1448                         }
1449                 ret=1;
1450                 goto end;
1451                 }
1452
1453         if (peer == NULL)
1454                 {
1455                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1456                 al=SSL_AD_UNEXPECTED_MESSAGE;
1457                 goto f_err;
1458                 }
1459
1460         if (!(type & EVP_PKT_SIGN))
1461                 {
1462                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1463                 al=SSL_AD_ILLEGAL_PARAMETER;
1464                 goto f_err;
1465                 }
1466
1467         if (s->s3->change_cipher_spec)
1468                 {
1469                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1470                 al=SSL_AD_UNEXPECTED_MESSAGE;
1471                 goto f_err;
1472                 }
1473
1474         /* we now have a signature that we need to verify */
1475         p=(unsigned char *)s->init_buf->data;
1476         n2s(p,i);
1477         n-=2;
1478         if (i > n)
1479                 {
1480                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1481                 al=SSL_AD_DECODE_ERROR;
1482                 goto f_err;
1483                 }
1484
1485         j=EVP_PKEY_size(pkey);
1486         if ((i > j) || (n > j) || (n <= 0))
1487                 {
1488                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1489                 al=SSL_AD_DECODE_ERROR;
1490                 goto f_err;
1491                 }
1492
1493 #ifndef NO_RSA
1494         if (pkey->type == EVP_PKEY_RSA)
1495                 {
1496                 i=RSA_public_decrypt(i,p,p,pkey->pkey.rsa,RSA_PKCS1_PADDING);
1497                 if (i < 0)
1498                         {
1499                         al=SSL_AD_DECRYPT_ERROR;
1500                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1501                         goto f_err;
1502                         }
1503                 if ((i != (MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH)) ||
1504                         memcmp(&(s->s3->tmp.finish_md[0]),p,
1505                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH))
1506                         {
1507                         al=SSL_AD_DECRYPT_ERROR;
1508                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1509                         goto f_err;
1510                         }
1511                 }
1512         else
1513 #endif
1514 #ifndef NO_DSA
1515                 if (pkey->type == EVP_PKEY_DSA)
1516                 {
1517                 j=DSA_verify(pkey->save_type,
1518                         &(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]),
1519                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1520                 if (j <= 0)
1521                         {
1522                         /* bad signature */
1523                         al=SSL_AD_DECRYPT_ERROR;
1524                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1525                         goto f_err;
1526                         }
1527                 }
1528         else
1529 #endif
1530                 {
1531                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1532                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1533                 goto f_err;
1534                 }
1535
1536
1537         ret=1;
1538         if (0)
1539                 {
1540 f_err:
1541                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1542                 }
1543 end:
1544         EVP_PKEY_free(pkey);
1545         return(ret);
1546         }
1547
1548 static int ssl3_get_client_certificate(SSL *s)
1549         {
1550         int i,ok,al,ret= -1;
1551         X509 *x=NULL;
1552         unsigned long l,nc,llen,n;
1553         unsigned char *p,*d,*q;
1554         STACK_OF(X509) *sk=NULL;
1555
1556         n=ssl3_get_message(s,
1557                 SSL3_ST_SR_CERT_A,
1558                 SSL3_ST_SR_CERT_B,
1559                 -1,
1560 #if defined(MSDOS) && !defined(WIN32)
1561                 1024*30, /* 30k max cert list :-) */
1562 #else
1563                 1024*100, /* 100k max cert list :-) */
1564 #endif
1565                 &ok);
1566
1567         if (!ok) return((int)n);
1568
1569         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1570                 {
1571                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1572                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1573                         {
1574                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1575                         al=SSL_AD_HANDSHAKE_FAILURE;
1576                         goto f_err;
1577                         }
1578                 /* If tls asked for a client cert we must return a 0 list */
1579                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1580                         {
1581                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1582                         al=SSL_AD_UNEXPECTED_MESSAGE;
1583                         goto f_err;
1584                         }
1585                 s->s3->tmp.reuse_message=1;
1586                 return(1);
1587                 }
1588
1589         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1590                 {
1591                 al=SSL_AD_UNEXPECTED_MESSAGE;
1592                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1593                 goto f_err;
1594                 }
1595         d=p=(unsigned char *)s->init_buf->data;
1596
1597         if ((sk=sk_X509_new_null()) == NULL)
1598                 {
1599                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1600                 goto err;
1601                 }
1602
1603         n2l3(p,llen);
1604         if (llen+3 != n)
1605                 {
1606                 al=SSL_AD_DECODE_ERROR;
1607                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1608                 goto f_err;
1609                 }
1610         for (nc=0; nc<llen; )
1611                 {
1612                 n2l3(p,l);
1613                 if ((l+nc+3) > llen)
1614                         {
1615                         al=SSL_AD_DECODE_ERROR;
1616                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1617                         goto f_err;
1618                         }
1619
1620                 q=p;
1621                 x=d2i_X509(NULL,&p,l);
1622                 if (x == NULL)
1623                         {
1624                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1625                         goto err;
1626                         }
1627                 if (p != (q+l))
1628                         {
1629                         al=SSL_AD_DECODE_ERROR;
1630                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1631                         goto f_err;
1632                         }
1633                 if (!sk_X509_push(sk,x))
1634                         {
1635                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1636                         goto err;
1637                         }
1638                 x=NULL;
1639                 nc+=l+3;
1640                 }
1641
1642         if (sk_X509_num(sk) <= 0)
1643                 {
1644                 /* TLS does not mind 0 certs returned */
1645                 if (s->version == SSL3_VERSION)
1646                         {
1647                         al=SSL_AD_HANDSHAKE_FAILURE;
1648                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1649                         goto f_err;
1650                         }
1651                 /* Fail for TLS only if we required a certificate */
1652                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1653                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1654                         {
1655                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1656                         al=SSL_AD_HANDSHAKE_FAILURE;
1657                         goto f_err;
1658                         }
1659                 }
1660         else
1661                 {
1662                 i=ssl_verify_cert_chain(s,sk);
1663                 if (!i)
1664                         {
1665                         al=ssl_verify_alarm_type(s->verify_result);
1666                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1667                         goto f_err;
1668                         }
1669                 }
1670
1671         /* This should not be needed */
1672         if (s->session->peer != NULL)
1673                 X509_free(s->session->peer);
1674         s->session->peer=sk_X509_shift(sk);
1675         s->session->cert->cert_chain=sk;
1676         sk=NULL;
1677
1678         ret=1;
1679         if (0)
1680                 {
1681 f_err:
1682                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1683                 }
1684 err:
1685         if (x != NULL) X509_free(x);
1686         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1687         return(ret);
1688         }
1689
1690 int ssl3_send_server_certificate(SSL *s)
1691         {
1692         unsigned long l;
1693         X509 *x;
1694
1695         if (s->state == SSL3_ST_SW_CERT_A)
1696                 {
1697                 x=ssl_get_server_send_cert(s);
1698                 if (x == NULL)
1699                         {
1700                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
1701                         return(0);
1702                         }
1703
1704                 l=ssl3_output_cert_chain(s,x);
1705                 s->state=SSL3_ST_SW_CERT_B;
1706                 s->init_num=(int)l;
1707                 s->init_off=0;
1708                 }
1709
1710         /* SSL3_ST_SW_CERT_B */
1711         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1712         }