ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #define REUSE_CIPHER_BUG
  60 #define NETSCAPE_HANG_BUG
  61
  62
  63 #include <stdio.h>
  64 #include <openssl/buffer.h>
  65 #include <openssl/rand.h>
  66 #include <openssl/objects.h>
  67 #include <openssl/evp.h>
  68 #include <openssl/x509.h>
  69 #include <openssl/krb5_asn.h>
  70 #include "ssl_locl.h"
  71
  72 #ifndef OPENSSL_NO_KRB5
  73 #include "kssl_lcl.h"
  74 #endif /* OPENSSL_NO_KRB5 */
  75
  76 static SSL_METHOD *ssl3_get_server_method(int ver);
  77 static int ssl3_get_client_hello(SSL *s);
  78 static int ssl3_check_client_hello(SSL *s);
  79 static int ssl3_send_server_hello(SSL *s);
  80 static int ssl3_send_server_key_exchange(SSL *s);
  81 static int ssl3_send_certificate_request(SSL *s);
  82 static int ssl3_send_server_done(SSL *s);
  83 static int ssl3_get_client_key_exchange(SSL *s);
  84 static int ssl3_get_client_certificate(SSL *s);
  85 static int ssl3_get_cert_verify(SSL *s);
  86 static int ssl3_send_hello_request(SSL *s);
  87
  88 static SSL_METHOD *ssl3_get_server_method(int ver)
  89         {
  90         if (ver == SSL3_VERSION)
  91                 return(SSLv3_server_method());
  92         else
  93                 return(NULL);
  94         }
  95
  96 SSL_METHOD *SSLv3_server_method(void)
  97         {
  98         static int init=1;
  99         static SSL_METHOD SSLv3_server_data;
 100
 101         if (init)
 102                 {
 103                 memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 104                         sizeof(SSL_METHOD));
 105                 SSLv3_server_data.ssl_accept=ssl3_accept;
 106                 SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 107                 init=0;
 108                 }
 109         return(&SSLv3_server_data);
 110         }
 111
 112 int ssl3_accept(SSL *s)
 113         {
 114         BUF_MEM *buf;
 115         unsigned long l,Time=time(NULL);
 116         void (*cb)()=NULL;
 117         long num1;
 118         int ret= -1;
 119         int new_state,state,skip=0;
 120
 121         RAND_add(&Time,sizeof(Time),0);
 122         ERR_clear_error();
 123         clear_sys_error();
 124
 125         if (s->info_callback != NULL)
 126                 cb=s->info_callback;
 127         else if (s->ctx->info_callback != NULL)
 128                 cb=s->ctx->info_callback;
 129
 130         /* init things to blank */
 131         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 132         s->in_handshake++;
 133
 134         if (s->cert == NULL)
 135                 {
 136                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 137                 return(-1);
 138                 }
 139
 140         for (;;)
 141                 {
 142                 state=s->state;
 143
 144                 switch (s->state)
 145                         {
 146                 case SSL_ST_RENEGOTIATE:
 147                         s->new_session=1;
 148                         /* s->state=SSL_ST_ACCEPT; */
 149
 150                 case SSL_ST_BEFORE:
 151                 case SSL_ST_ACCEPT:
 152                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 153                 case SSL_ST_OK|SSL_ST_ACCEPT:
 154
 155                         s->server=1;
 156                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 157
 158                         if ((s->version>>8) != 3)
 159                                 {
 160                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 161                                 return -1;
 162                                 }
 163                         s->type=SSL_ST_ACCEPT;
 164
 165                         if (s->init_buf == NULL)
 166                                 {
 167                                 if ((buf=BUF_MEM_new()) == NULL)
 168                                         {
 169                                         ret= -1;
 170                                         goto end;
 171                                         }
 172                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 173                                         {
 174                                         ret= -1;
 175                                         goto end;
 176                                         }
 177                                 s->init_buf=buf;
 178                                 }
 179
 180                         if (!ssl3_setup_buffers(s))
 181                                 {
 182                                 ret= -1;
 183                                 goto end;
 184                                 }
 185
 186                         /* Ok, we now need to push on a buffering BIO so that
 187                          * the output is sent in a way that TCP likes :-)
 188                          */
 189                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 190
 191                         s->init_num=0;
 192
 193                         if (s->state != SSL_ST_RENEGOTIATE)
 194                                 {
 195                                 ssl3_init_finished_mac(s);
 196                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 197                                 s->ctx->stats.sess_accept++;
 198                                 }
 199                         else
 200                                 {
 201                                 s->ctx->stats.sess_accept_renegotiate++;
 202                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 203                                 }
 204                         break;
 205
 206                 case SSL3_ST_SW_HELLO_REQ_A:
 207                 case SSL3_ST_SW_HELLO_REQ_B:
 208
 209                         s->shutdown=0;
 210                         ret=ssl3_send_hello_request(s);
 211                         if (ret <= 0) goto end;
 212                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 213                         s->state=SSL3_ST_SW_FLUSH;
 214                         s->init_num=0;
 215
 216                         ssl3_init_finished_mac(s);
 217                         break;
 218
 219                 case SSL3_ST_SW_HELLO_REQ_C:
 220                         s->state=SSL_ST_OK;
 221                         ret=1;
 222                         goto end;
 223                         /* break; */
 224
 225                 case SSL3_ST_SR_CLNT_HELLO_A:
 226                 case SSL3_ST_SR_CLNT_HELLO_B:
 227                 case SSL3_ST_SR_CLNT_HELLO_C:
 228
 229                         s->shutdown=0;
 230                         ret=ssl3_get_client_hello(s);
 231                         if (ret <= 0) goto end;
 232                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 233                         s->init_num=0;
 234                         break;
 235
 236                 case SSL3_ST_SW_SRVR_HELLO_A:
 237                 case SSL3_ST_SW_SRVR_HELLO_B:
 238                         ret=ssl3_send_server_hello(s);
 239                         if (ret <= 0) goto end;
 240
 241                         if (s->hit)
 242                                 s->state=SSL3_ST_SW_CHANGE_A;
 243                         else
 244                                 s->state=SSL3_ST_SW_CERT_A;
 245                         s->init_num=0;
 246                         break;
 247
 248                 case SSL3_ST_SW_CERT_A:
 249                 case SSL3_ST_SW_CERT_B:
 250                         /* Check if it is anon DH */
 251                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 252                                 {
 253                                 ret=ssl3_send_server_certificate(s);
 254                                 if (ret <= 0) goto end;
 255                                 }
 256                         else
 257                                 skip=1;
 258                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 259                         s->init_num=0;
 260                         break;
 261
 262                 case SSL3_ST_SW_KEY_EXCH_A:
 263                 case SSL3_ST_SW_KEY_EXCH_B:
 264                         l=s->s3->tmp.new_cipher->algorithms;
 265
 266                         /* clear this, it may get reset by
 267                          * send_server_key_exchange */
 268                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 269 #ifndef OPENSSL_NO_KRB5
 270                                 && !(l & SSL_KRB5)
 271 #endif /* OPENSSL_NO_KRB5 */
 272                                 )
 273                                 s->s3->tmp.use_rsa_tmp=1;
 274                         else
 275                                 s->s3->tmp.use_rsa_tmp=0;
 276
 277                         /* only send if a DH key exchange, fortezza or
 278                          * RSA but we have a sign only certificate */
 279                         if (s->s3->tmp.use_rsa_tmp
 280                             || (l & (SSL_DH|SSL_kFZA))
 281                             || ((l & SSL_kRSA)
 282                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 283                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 284                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 285                                         )
 286                                     )
 287                                 )
 288                             )
 289                                 {
 290                                 ret=ssl3_send_server_key_exchange(s);
 291                                 if (ret <= 0) goto end;
 292                                 }
 293                         else
 294                                 skip=1;
 295
 296                         s->state=SSL3_ST_SW_CERT_REQ_A;
 297                         s->init_num=0;
 298                         break;
 299
 300                 case SSL3_ST_SW_CERT_REQ_A:
 301                 case SSL3_ST_SW_CERT_REQ_B:
 302                         if (/* don't request cert unless asked for it: */
 303                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 304                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 305                                  * don't request cert during re-negotiation: */
 306                                 ((s->session->peer != NULL) &&
 307                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 308                                 /* never request cert in anonymous ciphersuites
 309                                  * (see section "Certificate request" in SSL 3 drafts
 310                                  * and in RFC 2246): */
 311                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 312                                  /* ... except when the application insists on verification
 313                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 314                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
 315                                 {
 316                                 /* no cert request */
 317                                 skip=1;
 318                                 s->s3->tmp.cert_request=0;
 319                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 320                                 }
 321                         else
 322                                 {
 323                                 s->s3->tmp.cert_request=1;
 324                                 ret=ssl3_send_certificate_request(s);
 325                                 if (ret <= 0) goto end;
 326 #ifndef NETSCAPE_HANG_BUG
 327                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 328 #else
 329                                 s->state=SSL3_ST_SW_FLUSH;
 330                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 331 #endif
 332                                 s->init_num=0;
 333                                 }
 334                         break;
 335
 336                 case SSL3_ST_SW_SRVR_DONE_A:
 337                 case SSL3_ST_SW_SRVR_DONE_B:
 338                         ret=ssl3_send_server_done(s);
 339                         if (ret <= 0) goto end;
 340                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 341                         s->state=SSL3_ST_SW_FLUSH;
 342                         s->init_num=0;
 343                         break;
 344
 345                 case SSL3_ST_SW_FLUSH:
 346                         /* number of bytes to be flushed */
 347                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 348                         if (num1 > 0)
 349                                 {
 350                                 s->rwstate=SSL_WRITING;
 351                                 num1=BIO_flush(s->wbio);
 352                                 if (num1 <= 0) { ret= -1; goto end; }
 353                                 s->rwstate=SSL_NOTHING;
 354                                 }
 355
 356                         s->state=s->s3->tmp.next_state;
 357                         break;
 358
 359                 case SSL3_ST_SR_CERT_A:
 360                 case SSL3_ST_SR_CERT_B:
 361                         /* Check for second client hello (MS SGC) */
 362                         ret = ssl3_check_client_hello(s);
 363                         if (ret <= 0)
 364                                 goto end;
 365                         if (ret == 2)
 366                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 367                         else {
 368                                 /* could be sent for a DH cert, even if we
 369                                  * have not asked for it :-) */
 370                                 ret=ssl3_get_client_certificate(s);
 371                                 if (ret <= 0) goto end;
 372                                 s->init_num=0;
 373                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 374                         }
 375                         break;
 376
 377                 case SSL3_ST_SR_KEY_EXCH_A:
 378                 case SSL3_ST_SR_KEY_EXCH_B:
 379                         ret=ssl3_get_client_key_exchange(s);
 380                         if (ret <= 0) goto end;
 381                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 382                         s->init_num=0;
 383
 384                         /* We need to get hashes here so if there is
 385                          * a client cert, it can be verified */
 386                         s->method->ssl3_enc->cert_verify_mac(s,
 387                                 &(s->s3->finish_dgst1),
 388                                 &(s->s3->tmp.cert_verify_md[0]));
 389                         s->method->ssl3_enc->cert_verify_mac(s,
 390                                 &(s->s3->finish_dgst2),
 391                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 392
 393                         break;
 394
 395                 case SSL3_ST_SR_CERT_VRFY_A:
 396                 case SSL3_ST_SR_CERT_VRFY_B:
 397
 398                         /* we should decide if we expected this one */
 399                         ret=ssl3_get_cert_verify(s);
 400                         if (ret <= 0) goto end;
 401
 402                         s->state=SSL3_ST_SR_FINISHED_A;
 403                         s->init_num=0;
 404                         break;
 405
 406                 case SSL3_ST_SR_FINISHED_A:
 407                 case SSL3_ST_SR_FINISHED_B:
 408                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 409                                 SSL3_ST_SR_FINISHED_B);
 410                         if (ret <= 0) goto end;
 411                         if (s->hit)
 412                                 s->state=SSL_ST_OK;
 413                         else
 414                                 s->state=SSL3_ST_SW_CHANGE_A;
 415                         s->init_num=0;
 416                         break;
 417
 418                 case SSL3_ST_SW_CHANGE_A:
 419                 case SSL3_ST_SW_CHANGE_B:
 420
 421                         s->session->cipher=s->s3->tmp.new_cipher;
 422                         if (!s->method->ssl3_enc->setup_key_block(s))
 423                                 { ret= -1; goto end; }
 424
 425                         ret=ssl3_send_change_cipher_spec(s,
 426                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 427
 428                         if (ret <= 0) goto end;
 429                         s->state=SSL3_ST_SW_FINISHED_A;
 430                         s->init_num=0;
 431
 432                         if (!s->method->ssl3_enc->change_cipher_state(s,
 433                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 434                                 {
 435                                 ret= -1;
 436                                 goto end;
 437                                 }
 438
 439                         break;
 440
 441                 case SSL3_ST_SW_FINISHED_A:
 442                 case SSL3_ST_SW_FINISHED_B:
 443                         ret=ssl3_send_finished(s,
 444                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 445                                 s->method->ssl3_enc->server_finished_label,
 446                                 s->method->ssl3_enc->server_finished_label_len);
 447                         if (ret <= 0) goto end;
 448                         s->state=SSL3_ST_SW_FLUSH;
 449                         if (s->hit)
 450                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 451                         else
 452                                 s->s3->tmp.next_state=SSL_ST_OK;
 453                         s->init_num=0;
 454                         break;
 455
 456                 case SSL_ST_OK:
 457                         /* clean a few things up */
 458                         ssl3_cleanup_key_block(s);
 459
 460                         BUF_MEM_free(s->init_buf);
 461                         s->init_buf=NULL;
 462
 463                         /* remove buffering on output */
 464                         ssl_free_wbio_buffer(s);
 465
 466                         s->new_session=0;
 467                         s->init_num=0;
 468
 469                         ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 470
 471                         s->ctx->stats.sess_accept_good++;
 472                         /* s->server=1; */
 473                         s->handshake_func=ssl3_accept;
 474                         ret=1;
 475
 476                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 477
 478                         goto end;
 479                         /* break; */
 480
 481                 default:
 482                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 483                         ret= -1;
 484                         goto end;
 485                         /* break; */
 486                         }
 487
 488                 if (!s->s3->tmp.reuse_message && !skip)
 489                         {
 490                         if (s->debug)
 491                                 {
 492                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 493                                         goto end;
 494                                 }
 495
 496
 497                         if ((cb != NULL) && (s->state != state))
 498                                 {
 499                                 new_state=s->state;
 500                                 s->state=state;
 501                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 502                                 s->state=new_state;
 503                                 }
 504                         }
 505                 skip=0;
 506                 }
 507 end:
 508         /* BIO_flush(s->wbio); */
 509
 510         if (cb != NULL)
 511                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 512         s->in_handshake--;
 513         return(ret);
 514         }
 515
 516 static int ssl3_send_hello_request(SSL *s)
 517         {
 518         unsigned char *p;
 519
 520         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 521                 {
 522                 p=(unsigned char *)s->init_buf->data;
 523                 *(p++)=SSL3_MT_HELLO_REQUEST;
 524                 *(p++)=0;
 525                 *(p++)=0;
 526                 *(p++)=0;
 527
 528                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 529                 /* number of bytes to write */
 530                 s->init_num=4;
 531                 s->init_off=0;
 532                 }
 533
 534         /* SSL3_ST_SW_HELLO_REQ_B */
 535         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 536         }
 537
 538 static int ssl3_check_client_hello(SSL *s)
 539         {
 540         int ok;
 541         long n;
 542
 543         n=ssl3_get_message(s,
 544                 SSL3_ST_SR_CERT_A,
 545                 SSL3_ST_SR_CERT_B,
 546                 -1,
 547                 SSL3_RT_MAX_PLAIN_LENGTH,
 548                 &ok);
 549         if (!ok) return((int)n);
 550         s->s3->tmp.reuse_message = 1;
 551         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 552                 {
 553                 /* Throw away what we have done so far in the current handshake,
 554                  * which will now be aborted. (A full SSL_clear would be too much.)
 555                  * I hope that tmp.dh is the only thing that may need to be cleared
 556                  * when a handshake is not completed ... */
 557 #ifndef OPENSSL_NO_DH
 558                 if (s->s3->tmp.dh != NULL)
 559                         {
 560                         DH_free(s->s3->tmp.dh);
 561                         s->s3->tmp.dh = NULL;
 562                         }
 563 #endif
 564                 return 2;
 565                 }
 566         return 1;
 567 }
 568
 569 static int ssl3_get_client_hello(SSL *s)
 570         {
 571         int i,j,ok,al,ret= -1;
 572         long n;
 573         unsigned long id;
 574         unsigned char *p,*d,*q;
 575         SSL_CIPHER *c;
 576         SSL_COMP *comp=NULL;
 577         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 578
 579         /* We do this so that we will respond with our native type.
 580          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 581          * This down switching should be handled by a different method.
 582          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 583          * TLSv1.
 584          */
 585         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 586                 {
 587                 s->first_packet=1;
 588                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 589                 }
 590         n=ssl3_get_message(s,
 591                 SSL3_ST_SR_CLNT_HELLO_B,
 592                 SSL3_ST_SR_CLNT_HELLO_C,
 593                 SSL3_MT_CLIENT_HELLO,
 594                 SSL3_RT_MAX_PLAIN_LENGTH,
 595                 &ok);
 596
 597         if (!ok) return((int)n);
 598         d=p=(unsigned char *)s->init_buf->data;
 599
 600         /* use version from inside client hello, not from record header
 601          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 602         s->client_version=(((int)p[0])<<8)|(int)p[1];
 603         p+=2;
 604
 605         /* load the client random */
 606         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 607         p+=SSL3_RANDOM_SIZE;
 608
 609         /* get the session-id */
 610         j= *(p++);
 611
 612         s->hit=0;
 613         if (j == 0)
 614                 {
 615                 if (!ssl_get_new_session(s,1))
 616                         goto err;
 617                 }
 618         else
 619                 {
 620                 i=ssl_get_prev_session(s,p,j);
 621                 if (i == 1)
 622                         { /* previous session */
 623                         s->hit=1;
 624                         }
 625                 else if (i == -1)
 626                         goto err;
 627                 else /* i == 0 */
 628                         {
 629                         if (!ssl_get_new_session(s,1))
 630                                 goto err;
 631                         }
 632                 }
 633
 634         p+=j;
 635         n2s(p,i);
 636         if ((i == 0) && (j != 0))
 637                 {
 638                 /* we need a cipher if we are not resuming a session */
 639                 al=SSL_AD_ILLEGAL_PARAMETER;
 640                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 641                 goto f_err;
 642                 }
 643         if ((i+p) > (d+n))
 644                 {
 645                 /* not enough data */
 646                 al=SSL_AD_DECODE_ERROR;
 647                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 648                 goto f_err;
 649                 }
 650         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 651                 == NULL))
 652                 {
 653                 goto err;
 654                 }
 655         p+=i;
 656
 657         /* If it is a hit, check that the cipher is in the list */
 658         if ((s->hit) && (i > 0))
 659                 {
 660                 j=0;
 661                 id=s->session->cipher->id;
 662
 663 #ifdef CIPHER_DEBUG
 664                 printf("client sent %d ciphers\n",sk_num(ciphers));
 665 #endif
 666                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 667                         {
 668                         c=sk_SSL_CIPHER_value(ciphers,i);
 669 #ifdef CIPHER_DEBUG
 670                         printf("client [%2d of %2d]:%s\n",
 671                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 672 #endif
 673                         if (c->id == id)
 674                                 {
 675                                 j=1;
 676                                 break;
 677                                 }
 678                         }
 679                 if (j == 0)
 680                         {
 681                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 682                                 {
 683                                 /* Very bad for multi-threading.... */
 684                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 685                                                                        0);
 686                                 }
 687                         else
 688                                 {
 689                                 /* we need to have the cipher in the cipher
 690                                  * list if we are asked to reuse it */
 691                                 al=SSL_AD_ILLEGAL_PARAMETER;
 692                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 693                                 goto f_err;
 694                                 }
 695                         }
 696                 }
 697
 698         /* compression */
 699         i= *(p++);
 700         q=p;
 701         for (j=0; j<i; j++)
 702                 {
 703                 if (p[j] == 0) break;
 704                 }
 705
 706         p+=i;
 707         if (j >= i)
 708                 {
 709                 /* no compress */
 710                 al=SSL_AD_DECODE_ERROR;
 711                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 712                 goto f_err;
 713                 }
 714
 715         /* Worst case, we will use the NULL compression, but if we have other
 716          * options, we will now look for them.  We have i-1 compression
 717          * algorithms from the client, starting at q. */
 718         s->s3->tmp.new_compression=NULL;
 719         if (s->ctx->comp_methods != NULL)
 720                 { /* See if we have a match */
 721                 int m,nn,o,v,done=0;
 722
 723                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 724                 for (m=0; m<nn; m++)
 725                         {
 726                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 727                         v=comp->id;
 728                         for (o=0; o<i; o++)
 729                                 {
 730                                 if (v == q[o])
 731                                         {
 732                                         done=1;
 733                                         break;
 734                                         }
 735                                 }
 736                         if (done) break;
 737                         }
 738                 if (done)
 739                         s->s3->tmp.new_compression=comp;
 740                 else
 741                         comp=NULL;
 742                 }
 743
 744         /* TLS does not mind if there is extra stuff */
 745         if (s->version == SSL3_VERSION)
 746                 {
 747                 if (p > (d+n))
 748                         {
 749                         /* wrong number of bytes,
 750                          * there could be more to follow */
 751                         al=SSL_AD_DECODE_ERROR;
 752                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 753                         goto f_err;
 754                         }
 755                 }
 756
 757         /* Given s->session->ciphers and SSL_get_ciphers, we must
 758          * pick a cipher */
 759
 760         if (!s->hit)
 761                 {
 762                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 763                 if (s->session->ciphers != NULL)
 764                         sk_SSL_CIPHER_free(s->session->ciphers);
 765                 s->session->ciphers=ciphers;
 766                 if (ciphers == NULL)
 767                         {
 768                         al=SSL_AD_ILLEGAL_PARAMETER;
 769                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 770                         goto f_err;
 771                         }
 772                 ciphers=NULL;
 773                 c=ssl3_choose_cipher(s,s->session->ciphers,
 774                                      SSL_get_ciphers(s));
 775
 776                 if (c == NULL)
 777                         {
 778                         al=SSL_AD_HANDSHAKE_FAILURE;
 779                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 780                         goto f_err;
 781                         }
 782                 s->s3->tmp.new_cipher=c;
 783                 }
 784         else
 785                 {
 786                 /* Session-id reuse */
 787 #ifdef REUSE_CIPHER_BUG
 788                 STACK_OF(SSL_CIPHER) *sk;
 789                 SSL_CIPHER *nc=NULL;
 790                 SSL_CIPHER *ec=NULL;
 791
 792                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 793                         {
 794                         sk=s->session->ciphers;
 795                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 796                                 {
 797                                 c=sk_SSL_CIPHER_value(sk,i);
 798                                 if (c->algorithms & SSL_eNULL)
 799                                         nc=c;
 800                                 if (SSL_C_IS_EXPORT(c))
 801                                         ec=c;
 802                                 }
 803                         if (nc != NULL)
 804                                 s->s3->tmp.new_cipher=nc;
 805                         else if (ec != NULL)
 806                                 s->s3->tmp.new_cipher=ec;
 807                         else
 808                                 s->s3->tmp.new_cipher=s->session->cipher;
 809                         }
 810                 else
 811 #endif
 812                 s->s3->tmp.new_cipher=s->session->cipher;
 813                 }
 814
 815         /* we now have the following setup.
 816          * client_random
 817          * cipher_list          - our prefered list of ciphers
 818          * ciphers              - the clients prefered list of ciphers
 819          * compression          - basically ignored right now
 820          * ssl version is set   - sslv3
 821          * s->session           - The ssl session has been setup.
 822          * s->hit               - session reuse flag
 823          * s->tmp.new_cipher    - the new cipher to use.
 824          */
 825
 826         ret=1;
 827         if (0)
 828                 {
 829 f_err:
 830                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 831                 }
 832 err:
 833         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 834         return(ret);
 835         }
 836
 837 static int ssl3_send_server_hello(SSL *s)
 838         {
 839         unsigned char *buf;
 840         unsigned char *p,*d;
 841         int i,sl;
 842         unsigned long l,Time;
 843
 844         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 845                 {
 846                 buf=(unsigned char *)s->init_buf->data;
 847                 p=s->s3->server_random;
 848                 Time=time(NULL);                        /* Time */
 849                 l2n(Time,p);
 850                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 851                 /* Do the message type and length last */
 852                 d=p= &(buf[4]);
 853
 854                 *(p++)=s->version>>8;
 855                 *(p++)=s->version&0xff;
 856
 857                 /* Random stuff */
 858                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 859                 p+=SSL3_RANDOM_SIZE;
 860
 861                 /* now in theory we have 3 options to sending back the
 862                  * session id.  If it is a re-use, we send back the
 863                  * old session-id, if it is a new session, we send
 864                  * back the new session-id or we send back a 0 length
 865                  * session-id if we want it to be single use.
 866                  * Currently I will not implement the '0' length session-id
 867                  * 12-Jan-98 - I'll now support the '0' length stuff.
 868                  */
 869                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 870                         s->session->session_id_length=0;
 871
 872                 sl=s->session->session_id_length;
 873                 *(p++)=sl;
 874                 memcpy(p,s->session->session_id,sl);
 875                 p+=sl;
 876
 877                 /* put the cipher */
 878                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 879                 p+=i;
 880
 881                 /* put the compression method */
 882                 if (s->s3->tmp.new_compression == NULL)
 883                         *(p++)=0;
 884                 else
 885                         *(p++)=s->s3->tmp.new_compression->id;
 886
 887                 /* do the header */
 888                 l=(p-d);
 889                 d=buf;
 890                 *(d++)=SSL3_MT_SERVER_HELLO;
 891                 l2n3(l,d);
 892
 893                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 894                 /* number of bytes to write */
 895                 s->init_num=p-buf;
 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_done(SSL *s)
 904         {
 905         unsigned char *p;
 906
 907         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 908                 {
 909                 p=(unsigned char *)s->init_buf->data;
 910
 911                 /* do the header */
 912                 *(p++)=SSL3_MT_SERVER_DONE;
 913                 *(p++)=0;
 914                 *(p++)=0;
 915                 *(p++)=0;
 916
 917                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 918                 /* number of bytes to write */
 919                 s->init_num=4;
 920                 s->init_off=0;
 921                 }
 922
 923         /* SSL3_ST_CW_CLNT_HELLO_B */
 924         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 925         }
 926
 927 static int ssl3_send_server_key_exchange(SSL *s)
 928         {
 929 #ifndef OPENSSL_NO_RSA
 930         unsigned char *q;
 931         int j,num;
 932         RSA *rsa;
 933         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 934         unsigned int u;
 935 #endif
 936 #ifndef OPENSSL_NO_DH
 937         DH *dh=NULL,*dhp;
 938 #endif
 939         EVP_PKEY *pkey;
 940         unsigned char *p,*d;
 941         int al,i;
 942         unsigned long type;
 943         int n;
 944         CERT *cert;
 945         BIGNUM *r[4];
 946         int nr[4],kn;
 947         BUF_MEM *buf;
 948         EVP_MD_CTX md_ctx;
 949
 950         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 951                 {
 952                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 953                 cert=s->cert;
 954
 955                 buf=s->init_buf;
 956
 957                 r[0]=r[1]=r[2]=r[3]=NULL;
 958                 n=0;
 959 #ifndef OPENSSL_NO_RSA
 960                 if (type & SSL_kRSA)
 961                         {
 962                         rsa=cert->rsa_tmp;
 963                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 964                                 {
 965                                 rsa=s->cert->rsa_tmp_cb(s,
 966                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 967                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 968                                 if(rsa == NULL)
 969                                 {
 970                                         al=SSL_AD_HANDSHAKE_FAILURE;
 971                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 972                                         goto f_err;
 973                                 }
 974                                 CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
 975                                 cert->rsa_tmp=rsa;
 976                                 }
 977                         if (rsa == NULL)
 978                                 {
 979                                 al=SSL_AD_HANDSHAKE_FAILURE;
 980                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 981                                 goto f_err;
 982                                 }
 983                         r[0]=rsa->n;
 984                         r[1]=rsa->e;
 985                         s->s3->tmp.use_rsa_tmp=1;
 986                         }
 987                 else
 988 #endif
 989 #ifndef OPENSSL_NO_DH
 990                         if (type & SSL_kEDH)
 991                         {
 992                         dhp=cert->dh_tmp;
 993                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 994                                 dhp=s->cert->dh_tmp_cb(s,
 995                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 996                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 997                         if (dhp == NULL)
 998                                 {
 999                                 al=SSL_AD_HANDSHAKE_FAILURE;
1000                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1001                                 goto f_err;
1002                                 }
1003
1004                         if (s->s3->tmp.dh != NULL)
1005                                 {
1006                                 DH_free(dh);
1007                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1008                                 goto err;
1009                                 }
1010
1011                         if ((dh=DHparams_dup(dhp)) == NULL)
1012                                 {
1013                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1014                                 goto err;
1015                                 }
1016
1017                         s->s3->tmp.dh=dh;
1018                         if ((dhp->pub_key == NULL ||
1019                              dhp->priv_key == NULL ||
1020                              (s->options & SSL_OP_SINGLE_DH_USE)))
1021                                 {
1022                                 if(!DH_generate_key(dh))
1023                                     {
1024                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1025                                            ERR_R_DH_LIB);
1026                                     goto err;
1027                                     }
1028                                 }
1029                         else
1030                                 {
1031                                 dh->pub_key=BN_dup(dhp->pub_key);
1032                                 dh->priv_key=BN_dup(dhp->priv_key);
1033                                 if ((dh->pub_key == NULL) ||
1034                                         (dh->priv_key == NULL))
1035                                         {
1036                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1037                                         goto err;
1038                                         }
1039                                 }
1040                         r[0]=dh->p;
1041                         r[1]=dh->g;
1042                         r[2]=dh->pub_key;
1043                         }
1044                 else
1045 #endif
1046                         {
1047                         al=SSL_AD_HANDSHAKE_FAILURE;
1048                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1049                         goto f_err;
1050                         }
1051                 for (i=0; r[i] != NULL; i++)
1052                         {
1053                         nr[i]=BN_num_bytes(r[i]);
1054                         n+=2+nr[i];
1055                         }
1056
1057                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1058                         {
1059                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1060                                 == NULL)
1061                                 {
1062                                 al=SSL_AD_DECODE_ERROR;
1063                                 goto f_err;
1064                                 }
1065                         kn=EVP_PKEY_size(pkey);
1066                         }
1067                 else
1068                         {
1069                         pkey=NULL;
1070                         kn=0;
1071                         }
1072
1073                 if (!BUF_MEM_grow(buf,n+4+kn))
1074                         {
1075                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1076                         goto err;
1077                         }
1078                 d=(unsigned char *)s->init_buf->data;
1079                 p= &(d[4]);
1080
1081                 for (i=0; r[i] != NULL; i++)
1082                         {
1083                         s2n(nr[i],p);
1084                         BN_bn2bin(r[i],p);
1085                         p+=nr[i];
1086                         }
1087
1088                 /* not anonymous */
1089                 if (pkey != NULL)
1090                         {
1091                         /* n is the length of the params, they start at &(d[4])
1092                          * and p points to the space at the end. */
1093 #ifndef OPENSSL_NO_RSA
1094                         if (pkey->type == EVP_PKEY_RSA)
1095                                 {
1096                                 q=md_buf;
1097                                 j=0;
1098                                 for (num=2; num > 0; num--)
1099                                         {
1100                                         EVP_DigestInit(&md_ctx,(num == 2)
1101                                                 ?s->ctx->md5:s->ctx->sha1);
1102                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1103                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1104                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1105                                         EVP_DigestFinal(&md_ctx,q,
1106                                                 (unsigned int *)&i);
1107                                         q+=i;
1108                                         j+=i;
1109                                         }
1110                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1111                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1112                                         {
1113                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1114                                         goto err;
1115                                         }
1116                                 s2n(u,p);
1117                                 n+=u+2;
1118                                 }
1119                         else
1120 #endif
1121 #if !defined(OPENSSL_NO_DSA)
1122                                 if (pkey->type == EVP_PKEY_DSA)
1123                                 {
1124                                 /* lets do DSS */
1125                                 EVP_SignInit(&md_ctx,EVP_dss1());
1126                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1127                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1128                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1129                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1130                                         (unsigned int *)&i,pkey))
1131                                         {
1132                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1133                                         goto err;
1134                                         }
1135                                 s2n(i,p);
1136                                 n+=i+2;
1137                                 }
1138                         else
1139 #endif
1140                                 {
1141                                 /* Is this error check actually needed? */
1142                                 al=SSL_AD_HANDSHAKE_FAILURE;
1143                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1144                                 goto f_err;
1145                                 }
1146                         }
1147
1148                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1149                 l2n3(n,d);
1150
1151                 /* we should now have things packed up, so lets send
1152                  * it off */
1153                 s->init_num=n+4;
1154                 s->init_off=0;
1155                 }
1156
1157         s->state = SSL3_ST_SW_KEY_EXCH_B;
1158         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1159 f_err:
1160         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1161 err:
1162         return(-1);
1163         }
1164
1165 static int ssl3_send_certificate_request(SSL *s)
1166         {
1167         unsigned char *p,*d;
1168         int i,j,nl,off,n;
1169         STACK_OF(X509_NAME) *sk=NULL;
1170         X509_NAME *name;
1171         BUF_MEM *buf;
1172
1173         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1174                 {
1175                 buf=s->init_buf;
1176
1177                 d=p=(unsigned char *)&(buf->data[4]);
1178
1179                 /* get the list of acceptable cert types */
1180                 p++;
1181                 n=ssl3_get_req_cert_type(s,p);
1182                 d[0]=n;
1183                 p+=n;
1184                 n++;
1185
1186                 off=n;
1187                 p+=2;
1188                 n+=2;
1189
1190                 sk=SSL_get_client_CA_list(s);
1191                 nl=0;
1192                 if (sk != NULL)
1193                         {
1194                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1195                                 {
1196                                 name=sk_X509_NAME_value(sk,i);
1197                                 j=i2d_X509_NAME(name,NULL);
1198                                 if (!BUF_MEM_grow(buf,4+n+j+2))
1199                                         {
1200                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1201                                         goto err;
1202                                         }
1203                                 p=(unsigned char *)&(buf->data[4+n]);
1204                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1205                                         {
1206                                         s2n(j,p);
1207                                         i2d_X509_NAME(name,&p);
1208                                         n+=2+j;
1209                                         nl+=2+j;
1210                                         }
1211                                 else
1212                                         {
1213                                         d=p;
1214                                         i2d_X509_NAME(name,&p);
1215                                         j-=2; s2n(j,d); j+=2;
1216                                         n+=j;
1217                                         nl+=j;
1218                                         }
1219                                 }
1220                         }
1221                 /* else no CA names */
1222                 p=(unsigned char *)&(buf->data[4+off]);
1223                 s2n(nl,p);
1224
1225                 d=(unsigned char *)buf->data;
1226                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1227                 l2n3(n,d);
1228
1229                 /* we should now have things packed up, so lets send
1230                  * it off */
1231
1232                 s->init_num=n+4;
1233                 s->init_off=0;
1234 #ifdef NETSCAPE_HANG_BUG
1235                 p=(unsigned char *)s->init_buf->data + s->init_num;
1236
1237                 /* do the header */
1238                 *(p++)=SSL3_MT_SERVER_DONE;
1239                 *(p++)=0;
1240                 *(p++)=0;
1241                 *(p++)=0;
1242                 s->init_num += 4;
1243 #endif
1244
1245                 }
1246
1247         /* SSL3_ST_SW_CERT_REQ_B */
1248         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1249 err:
1250         return(-1);
1251         }
1252
1253 static int ssl3_get_client_key_exchange(SSL *s)
1254         {
1255         int i,al,ok;
1256         long n;
1257         unsigned long l;
1258         unsigned char *p;
1259 #ifndef OPENSSL_NO_RSA
1260         RSA *rsa=NULL;
1261         EVP_PKEY *pkey=NULL;
1262 #endif
1263 #ifndef OPENSSL_NO_DH
1264         BIGNUM *pub=NULL;
1265         DH *dh_srvr;
1266 #endif
1267 #ifndef OPENSSL_NO_KRB5
1268         KSSL_ERR kssl_err;
1269 #endif /* OPENSSL_NO_KRB5 */
1270
1271         n=ssl3_get_message(s,
1272                 SSL3_ST_SR_KEY_EXCH_A,
1273                 SSL3_ST_SR_KEY_EXCH_B,
1274                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1275                 2048, /* ??? */
1276                 &ok);
1277
1278         if (!ok) return((int)n);
1279         p=(unsigned char *)s->init_buf->data;
1280
1281         l=s->s3->tmp.new_cipher->algorithms;
1282
1283 #ifndef OPENSSL_NO_RSA
1284         if (l & SSL_kRSA)
1285                 {
1286                 /* FIX THIS UP EAY EAY EAY EAY */
1287                 if (s->s3->tmp.use_rsa_tmp)
1288                         {
1289                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1290                                 rsa=s->cert->rsa_tmp;
1291                         /* Don't do a callback because rsa_tmp should
1292                          * be sent already */
1293                         if (rsa == NULL)
1294                                 {
1295                                 al=SSL_AD_HANDSHAKE_FAILURE;
1296                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1297                                 goto f_err;
1298
1299                                 }
1300                         }
1301                 else
1302                         {
1303                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1304                         if (    (pkey == NULL) ||
1305                                 (pkey->type != EVP_PKEY_RSA) ||
1306                                 (pkey->pkey.rsa == NULL))
1307                                 {
1308                                 al=SSL_AD_HANDSHAKE_FAILURE;
1309                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1310                                 goto f_err;
1311                                 }
1312                         rsa=pkey->pkey.rsa;
1313                         }
1314
1315                 /* TLS */
1316                 if (s->version > SSL3_VERSION)
1317                         {
1318                         n2s(p,i);
1319                         if (n != i+2)
1320                                 {
1321                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1322                                         {
1323                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1324                                         goto err;
1325                                         }
1326                                 else
1327                                         p-=2;
1328                                 }
1329                         else
1330                                 n=i;
1331                         }
1332
1333                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1334
1335                 al = -1;
1336
1337                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1338                         {
1339                         al=SSL_AD_DECODE_ERROR;
1340                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1341                         }
1342
1343                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1344                         {
1345                         /* The premaster secret must contain the same version number as the
1346                          * ClientHello to detect version rollback attacks (strangely, the
1347                          * protocol does not offer such protection for DH ciphersuites).
1348                          * However, buggy clients exist that send the negotiated protocol
1349                          * version instead if the server does not support the requested
1350                          * protocol version.
1351                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1352                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1353                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1354                                 {
1355                                 al=SSL_AD_DECODE_ERROR;
1356                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
1357                                 goto f_err;
1358                                 }
1359                         }
1360
1361                 if (al != -1)
1362                         {
1363 #if 0
1364                         goto f_err;
1365 #else
1366                         /* Some decryption failure -- use random value instead as countermeasure
1367                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1368                          * (see RFC 2246, section 7.4.7.1).
1369                          * But note that due to length and protocol version checking, the
1370                          * attack is impractical anyway (see section 5 in D. Bleichenbacher:
1371                          * "Chosen Ciphertext Attacks Against Protocols Based on the RSA
1372                          * Encryption Standard PKCS #1", CRYPTO '98, LNCS 1462, pp. 1-12).
1373                          */
1374                         ERR_clear_error();
1375                         i = SSL_MAX_MASTER_KEY_LENGTH;
1376                         p[0] = s->client_version >> 8;
1377                         p[1] = s->client_version & 0xff;
1378                         RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */
1379 #endif
1380                         }
1381
1382                 s->session->master_key_length=
1383                         s->method->ssl3_enc->generate_master_secret(s,
1384                                 s->session->master_key,
1385                                 p,i);
1386                 memset(p,0,i);
1387                 }
1388         else
1389 #endif
1390 #ifndef OPENSSL_NO_DH
1391                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1392                 {
1393                 n2s(p,i);
1394                 if (n != i+2)
1395                         {
1396                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1397                                 {
1398                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1399                                 goto err;
1400                                 }
1401                         else
1402                                 {
1403                                 p-=2;
1404                                 i=(int)n;
1405                                 }
1406                         }
1407
1408                 if (n == 0L) /* the parameters are in the cert */
1409                         {
1410                         al=SSL_AD_HANDSHAKE_FAILURE;
1411                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1412                         goto f_err;
1413                         }
1414                 else
1415                         {
1416                         if (s->s3->tmp.dh == NULL)
1417                                 {
1418                                 al=SSL_AD_HANDSHAKE_FAILURE;
1419                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1420                                 goto f_err;
1421                                 }
1422                         else
1423                                 dh_srvr=s->s3->tmp.dh;
1424                         }
1425
1426                 pub=BN_bin2bn(p,i,NULL);
1427                 if (pub == NULL)
1428                         {
1429                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1430                         goto err;
1431                         }
1432
1433                 i=DH_compute_key(p,pub,dh_srvr);
1434
1435                 if (i <= 0)
1436                         {
1437                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1438                         goto err;
1439                         }
1440
1441                 DH_free(s->s3->tmp.dh);
1442                 s->s3->tmp.dh=NULL;
1443
1444                 BN_clear_free(pub);
1445                 pub=NULL;
1446                 s->session->master_key_length=
1447                         s->method->ssl3_enc->generate_master_secret(s,
1448                                 s->session->master_key,p,i);
1449                 memset(p,0,i);
1450                 }
1451         else
1452 #endif
1453 #ifndef OPENSSL_NO_KRB5
1454         if (l & SSL_kKRB5)
1455                 {
1456                 krb5_error_code         krb5rc;
1457                 krb5_data               enc_ticket;
1458                 krb5_data               authenticator;
1459                 krb5_data               enc_pms;
1460                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1461                 EVP_CIPHER_CTX          ciph_ctx;
1462                 EVP_CIPHER              *enc = NULL;
1463                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1464                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH];
1465                 int                     padl, outl = sizeof(pms);
1466                 krb5_timestamp          authtime = 0;
1467                 krb5_ticket_times       ttimes;
1468
1469                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1470
1471                 n2s(p,i);
1472                 enc_ticket.length = i;
1473                 enc_ticket.data = p;
1474                 p+=enc_ticket.length;
1475
1476                 n2s(p,i);
1477                 authenticator.length = i;
1478                 authenticator.data = p;
1479                 p+=authenticator.length;
1480
1481                 n2s(p,i);
1482                 enc_pms.length = i;
1483                 enc_pms.data = p;
1484                 p+=enc_pms.length;
1485
1486                 if (n != enc_ticket.length + authenticator.length +
1487                                                 enc_pms.length + 6)
1488                         {
1489                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1490                                 SSL_R_DATA_LENGTH_TOO_LONG);
1491                         goto err;
1492                         }
1493
1494                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1495                                         &kssl_err)) != 0)
1496                         {
1497 #ifdef KSSL_DEBUG
1498                         printf("kssl_sget_tkt rtn %d [%d]\n",
1499                                 krb5rc, kssl_err.reason);
1500                         if (kssl_err.text)
1501                                 printf("kssl_err text= %s\n", kssl_err.text);
1502 #endif  /* KSSL_DEBUG */
1503                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1504                                 kssl_err.reason);
1505                         goto err;
1506                         }
1507
1508                 /*  Note: no authenticator is not considered an error,
1509                 **  but will return authtime == 0.
1510                 */
1511                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1512                                         &authtime, &kssl_err)) != 0)
1513                         {
1514 #ifdef KSSL_DEBUG
1515                         printf("kssl_check_authent rtn %d [%d]\n",
1516                                 krb5rc, kssl_err.reason);
1517                         if (kssl_err.text)
1518                                 printf("kssl_err text= %s\n", kssl_err.text);
1519 #endif  /* KSSL_DEBUG */
1520                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1521                                 kssl_err.reason);
1522                         goto err;
1523                         }
1524
1525                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1526                         {
1527                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, krb5rc);
1528                         goto err;
1529                         }
1530
1531 #ifdef KSSL_DEBUG
1532                 kssl_ctx_show(kssl_ctx);
1533 #endif  /* KSSL_DEBUG */
1534
1535                 enc = kssl_map_enc(kssl_ctx->enctype);
1536                 memset(iv, 0, EVP_MAX_IV_LENGTH);       /* per RFC 1510 */
1537
1538                 EVP_DecryptInit(&ciph_ctx,enc,kssl_ctx->key,iv);
1539                 EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1540                                         enc_pms.data, enc_pms.length);
1541                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1542                         {
1543                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1544                                 SSL_R_DATA_LENGTH_TOO_LONG);
1545                         goto err;
1546                         }
1547                 EVP_DecryptFinal(&ciph_ctx,&(pms[outl]),&padl);
1548                 outl += padl;
1549                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1550                         {
1551                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1552                                 SSL_R_DATA_LENGTH_TOO_LONG);
1553                         goto err;
1554                         }
1555                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1556
1557                 s->session->master_key_length=
1558                         s->method->ssl3_enc->generate_master_secret(s,
1559                                 s->session->master_key, pms, outl);
1560
1561                 /*  Was doing kssl_ctx_free() here,
1562                 **  but it caused problems for apache.
1563                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
1564                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
1565                 */
1566                 }
1567         else
1568 #endif  /* OPENSSL_NO_KRB5 */
1569                 {
1570                 al=SSL_AD_HANDSHAKE_FAILURE;
1571                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1572                                 SSL_R_UNKNOWN_CIPHER_TYPE);
1573                 goto f_err;
1574                 }
1575
1576         return(1);
1577 f_err:
1578         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1579 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA)
1580 err:
1581 #endif
1582         return(-1);
1583         }
1584
1585 static int ssl3_get_cert_verify(SSL *s)
1586         {
1587         EVP_PKEY *pkey=NULL;
1588         unsigned char *p;
1589         int al,ok,ret=0;
1590         long n;
1591         int type=0,i,j;
1592         X509 *peer;
1593
1594         n=ssl3_get_message(s,
1595                 SSL3_ST_SR_CERT_VRFY_A,
1596                 SSL3_ST_SR_CERT_VRFY_B,
1597                 -1,
1598                 512, /* 512? */
1599                 &ok);
1600
1601         if (!ok) return((int)n);
1602
1603         if (s->session->peer != NULL)
1604                 {
1605                 peer=s->session->peer;
1606                 pkey=X509_get_pubkey(peer);
1607                 type=X509_certificate_type(peer,pkey);
1608                 }
1609         else
1610                 {
1611                 peer=NULL;
1612                 pkey=NULL;
1613                 }
1614
1615         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
1616                 {
1617                 s->s3->tmp.reuse_message=1;
1618                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
1619                         {
1620                         al=SSL_AD_UNEXPECTED_MESSAGE;
1621                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
1622                         goto f_err;
1623                         }
1624                 ret=1;
1625                 goto end;
1626                 }
1627
1628         if (peer == NULL)
1629                 {
1630                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1631                 al=SSL_AD_UNEXPECTED_MESSAGE;
1632                 goto f_err;
1633                 }
1634
1635         if (!(type & EVP_PKT_SIGN))
1636                 {
1637                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1638                 al=SSL_AD_ILLEGAL_PARAMETER;
1639                 goto f_err;
1640                 }
1641
1642         if (s->s3->change_cipher_spec)
1643                 {
1644                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1645                 al=SSL_AD_UNEXPECTED_MESSAGE;
1646                 goto f_err;
1647                 }
1648
1649         /* we now have a signature that we need to verify */
1650         p=(unsigned char *)s->init_buf->data;
1651         n2s(p,i);
1652         n-=2;
1653         if (i > n)
1654                 {
1655                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1656                 al=SSL_AD_DECODE_ERROR;
1657                 goto f_err;
1658                 }
1659
1660         j=EVP_PKEY_size(pkey);
1661         if ((i > j) || (n > j) || (n <= 0))
1662                 {
1663                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1664                 al=SSL_AD_DECODE_ERROR;
1665                 goto f_err;
1666                 }
1667
1668 #ifndef OPENSSL_NO_RSA
1669         if (pkey->type == EVP_PKEY_RSA)
1670                 {
1671                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
1672                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
1673                                                         pkey->pkey.rsa);
1674                 if (i < 0)
1675                         {
1676                         al=SSL_AD_DECRYPT_ERROR;
1677                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
1678                         goto f_err;
1679                         }
1680                 if (i == 0)
1681                         {
1682                         al=SSL_AD_DECRYPT_ERROR;
1683                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
1684                         goto f_err;
1685                         }
1686                 }
1687         else
1688 #endif
1689 #ifndef OPENSSL_NO_DSA
1690                 if (pkey->type == EVP_PKEY_DSA)
1691                 {
1692                 j=DSA_verify(pkey->save_type,
1693                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
1694                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
1695                 if (j <= 0)
1696                         {
1697                         /* bad signature */
1698                         al=SSL_AD_DECRYPT_ERROR;
1699                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
1700                         goto f_err;
1701                         }
1702                 }
1703         else
1704 #endif
1705                 {
1706                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
1707                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1708                 goto f_err;
1709                 }
1710
1711
1712         ret=1;
1713         if (0)
1714                 {
1715 f_err:
1716                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1717                 }
1718 end:
1719         EVP_PKEY_free(pkey);
1720         return(ret);
1721         }
1722
1723 static int ssl3_get_client_certificate(SSL *s)
1724         {
1725         int i,ok,al,ret= -1;
1726         X509 *x=NULL;
1727         unsigned long l,nc,llen,n;
1728         unsigned char *p,*d,*q;
1729         STACK_OF(X509) *sk=NULL;
1730
1731         n=ssl3_get_message(s,
1732                 SSL3_ST_SR_CERT_A,
1733                 SSL3_ST_SR_CERT_B,
1734                 -1,
1735 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN32)
1736                 1024*30, /* 30k max cert list :-) */
1737 #else
1738                 1024*100, /* 100k max cert list :-) */
1739 #endif
1740                 &ok);
1741
1742         if (!ok) return((int)n);
1743
1744         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
1745                 {
1746                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
1747                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1748                         {
1749                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1750                         al=SSL_AD_HANDSHAKE_FAILURE;
1751                         goto f_err;
1752                         }
1753                 /* If tls asked for a client cert, the client must return a 0 list */
1754                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
1755                         {
1756                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
1757                         al=SSL_AD_UNEXPECTED_MESSAGE;
1758                         goto f_err;
1759                         }
1760                 s->s3->tmp.reuse_message=1;
1761                 return(1);
1762                 }
1763
1764         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1765                 {
1766                 al=SSL_AD_UNEXPECTED_MESSAGE;
1767                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
1768                 goto f_err;
1769                 }
1770         d=p=(unsigned char *)s->init_buf->data;
1771
1772         if ((sk=sk_X509_new_null()) == NULL)
1773                 {
1774                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1775                 goto err;
1776                 }
1777
1778         n2l3(p,llen);
1779         if (llen+3 != n)
1780                 {
1781                 al=SSL_AD_DECODE_ERROR;
1782                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1783                 goto f_err;
1784                 }
1785         for (nc=0; nc<llen; )
1786                 {
1787                 n2l3(p,l);
1788                 if ((l+nc+3) > llen)
1789                         {
1790                         al=SSL_AD_DECODE_ERROR;
1791                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1792                         goto f_err;
1793                         }
1794
1795                 q=p;
1796                 x=d2i_X509(NULL,&p,l);
1797                 if (x == NULL)
1798                         {
1799                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
1800                         goto err;
1801                         }
1802                 if (p != (q+l))
1803                         {
1804                         al=SSL_AD_DECODE_ERROR;
1805                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1806                         goto f_err;
1807                         }
1808                 if (!sk_X509_push(sk,x))
1809                         {
1810                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1811                         goto err;
1812                         }
1813                 x=NULL;
1814                 nc+=l+3;
1815                 }
1816
1817         if (sk_X509_num(sk) <= 0)
1818                 {
1819                 /* TLS does not mind 0 certs returned */
1820                 if (s->version == SSL3_VERSION)
1821                         {
1822                         al=SSL_AD_HANDSHAKE_FAILURE;
1823                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
1824                         goto f_err;
1825                         }
1826                 /* Fail for TLS only if we required a certificate */
1827                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
1828                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
1829                         {
1830                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1831                         al=SSL_AD_HANDSHAKE_FAILURE;
1832                         goto f_err;
1833                         }
1834                 }
1835         else
1836                 {
1837                 i=ssl_verify_cert_chain(s,sk);
1838                 if (!i)
1839                         {
1840                         al=ssl_verify_alarm_type(s->verify_result);
1841                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
1842                         goto f_err;
1843                         }
1844                 }
1845
1846         if (s->session->peer != NULL) /* This should not be needed */
1847                 X509_free(s->session->peer);
1848         s->session->peer=sk_X509_shift(sk);
1849         s->session->verify_result = s->verify_result;
1850
1851         /* With the current implementation, sess_cert will always be NULL
1852          * when we arrive here. */
1853         if (s->session->sess_cert == NULL)
1854                 {
1855                 s->session->sess_cert = ssl_sess_cert_new();
1856                 if (s->session->sess_cert == NULL)
1857                         {
1858                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1859                         goto err;
1860                         }
1861                 }
1862         if (s->session->sess_cert->cert_chain != NULL)
1863                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
1864         s->session->sess_cert->cert_chain=sk;
1865         /* Inconsistency alert: cert_chain does *not* include the
1866          * peer's own certificate, while we do include it in s3_clnt.c */
1867
1868         sk=NULL;
1869
1870         ret=1;
1871         if (0)
1872                 {
1873 f_err:
1874                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1875                 }
1876 err:
1877         if (x != NULL) X509_free(x);
1878         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
1879         return(ret);
1880         }
1881
1882 int ssl3_send_server_certificate(SSL *s)
1883         {
1884         unsigned long l;
1885         X509 *x;
1886
1887         if (s->state == SSL3_ST_SW_CERT_A)
1888                 {
1889                 x=ssl_get_server_send_cert(s);
1890                 if (x == NULL &&
1891                         /* VRS: allow null cert if auth == KRB5 */
1892                         (s->s3->tmp.new_cipher->algorithms
1893                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1894                         != (SSL_aKRB5|SSL_kKRB5))
1895                         {
1896                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1897                         return(0);
1898                         }
1899
1900                 l=ssl3_output_cert_chain(s,x);
1901                 s->state=SSL3_ST_SW_CERT_B;
1902                 s->init_num=(int)l;
1903                 s->init_off=0;
1904                 }
1905
1906         /* SSL3_ST_SW_CERT_B */
1907         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1908         }