ssl/s3_clnt.c

   1 /* ssl/s3_clnt.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 #include <stdio.h>
  60 #include "buffer.h"
  61 #include "rand.h"
  62 #include "objects.h"
  63 #include "evp.h"
  64 #include "ssl_locl.h"
  65
  66 #define BREAK break
  67 /* SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
  68  * SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
  69  * SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
  70  * SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
  71  * SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
  72  * SSLerr(SSL_F_SSL3_GET_SERVER_DONE,ERR_R_MALLOC_FAILURE);
  73 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
  74  */
  75
  76 #ifndef NOPROTO
  77 static SSL_METHOD *ssl3_get_client_method(int ver);
  78 static int ssl3_client_hello(SSL *s);
  79 static int ssl3_get_server_hello(SSL *s);
  80 static int ssl3_get_certificate_request(SSL *s);
  81 static int ca_dn_cmp(X509_NAME **a,X509_NAME **b);
  82 static int ssl3_get_server_done(SSL *s);
  83 static int ssl3_send_client_verify(SSL *s);
  84 static int ssl3_send_client_certificate(SSL *s);
  85 static int ssl3_send_client_key_exchange(SSL *s);
  86 static int ssl3_get_key_exchange(SSL *s);
  87 static int ssl3_get_server_certificate(SSL *s);
  88 static int ssl3_check_cert_and_algorithm(SSL *s);
  89 #else
  90 static SSL_METHOD *ssl3_get_client_method();
  91 static int ssl3_client_hello();
  92 static int ssl3_get_server_hello();
  93 static int ssl3_get_certificate_request();
  94 static int ca_dn_cmp();
  95 static int ssl3_get_server_done();
  96 static int ssl3_send_client_verify();
  97 static int ssl3_send_client_certificate();
  98 static int ssl3_send_client_key_exchange();
  99 static int ssl3_get_key_exchange();
 100 static int ssl3_get_server_certificate();
 101 static int ssl3_check_cert_and_algorithm();
 102 #endif
 103
 104 static SSL_METHOD *ssl3_get_client_method(ver)
 105 int ver;
 106         {
 107         if (ver == SSL3_VERSION)
 108                 return(SSLv3_client_method());
 109         else
 110                 return(NULL);
 111         }
 112
 113 SSL_METHOD *SSLv3_client_method()
 114         {
 115         static int init=1;
 116         static SSL_METHOD SSLv3_client_data;
 117
 118         if (init)
 119                 {
 120                 init=0;
 121                 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
 122                         sizeof(SSL_METHOD));
 123                 SSLv3_client_data.ssl_connect=ssl3_connect;
 124                 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
 125                 }
 126         return(&SSLv3_client_data);
 127         }
 128
 129 int ssl3_connect(s)
 130 SSL *s;
 131         {
 132         BUF_MEM *buf;
 133         unsigned long Time=time(NULL),l;
 134         long num1;
 135         void (*cb)()=NULL;
 136         int ret= -1;
 137         BIO *under;
 138         int new_state,state,skip=0;;
 139
 140         RAND_seed(&Time,sizeof(Time));
 141         ERR_clear_error();
 142         clear_sys_error();
 143
 144         if (s->info_callback != NULL)
 145                 cb=s->info_callback;
 146         else if (s->ctx->info_callback != NULL)
 147                 cb=s->ctx->info_callback;
 148
 149         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 150         s->in_handshake++;
 151
 152         for (;;)
 153                 {
 154                 state=s->state;
 155
 156                 switch(s->state)
 157                         {
 158                 case SSL_ST_RENEGOTIATE:
 159                         s->new_session=1;
 160                         s->state=SSL_ST_CONNECT;
 161                         s->ctx->sess_connect_renegotiate++;
 162                         /* break */
 163                 case SSL_ST_BEFORE:
 164                 case SSL_ST_CONNECT:
 165                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 166                 case SSL_ST_OK|SSL_ST_CONNECT:
 167
 168                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 169
 170                         if ((s->version & 0xff00 ) != 0x0300)
 171                                 abort();
 172                         /* s->version=SSL3_VERSION; */
 173                         s->type=SSL_ST_CONNECT;
 174
 175                         if (s->init_buf == NULL)
 176                                 {
 177                                 if ((buf=BUF_MEM_new()) == NULL)
 178                                         {
 179                                         ret= -1;
 180                                         goto end;
 181                                         }
 182                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 183                                         {
 184                                         ret= -1;
 185                                         goto end;
 186                                         }
 187                                 s->init_buf=buf;
 188                                 }
 189
 190                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 191
 192                         /* setup buffing BIO */
 193                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 194
 195                         /* don't push the buffering BIO quite yet */
 196
 197                         ssl3_init_finished_mac(s);
 198
 199                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 200                         s->ctx->sess_connect++;
 201                         s->init_num=0;
 202                         break;
 203
 204                 case SSL3_ST_CW_CLNT_HELLO_A:
 205                 case SSL3_ST_CW_CLNT_HELLO_B:
 206
 207                         s->shutdown=0;
 208                         ret=ssl3_client_hello(s);
 209                         if (ret <= 0) goto end;
 210                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 211                         s->init_num=0;
 212
 213                         /* turn on buffering for the next lot of output */
 214                         if (s->bbio != s->wbio)
 215                                 s->wbio=BIO_push(s->bbio,s->wbio);
 216
 217                         break;
 218
 219                 case SSL3_ST_CR_SRVR_HELLO_A:
 220                 case SSL3_ST_CR_SRVR_HELLO_B:
 221                         ret=ssl3_get_server_hello(s);
 222                         if (ret <= 0) goto end;
 223                         if (s->hit)
 224                                 s->state=SSL3_ST_CR_FINISHED_A;
 225                         else
 226                                 s->state=SSL3_ST_CR_CERT_A;
 227                         s->init_num=0;
 228                         break;
 229
 230                 case SSL3_ST_CR_CERT_A:
 231                 case SSL3_ST_CR_CERT_B:
 232                         /* Check if it is anon DH */
 233                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 234                                 {
 235                                 ret=ssl3_get_server_certificate(s);
 236                                 if (ret <= 0) goto end;
 237                                 }
 238                         else
 239                                 skip=1;
 240                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 241                         s->init_num=0;
 242                         break;
 243
 244                 case SSL3_ST_CR_KEY_EXCH_A:
 245                 case SSL3_ST_CR_KEY_EXCH_B:
 246                         ret=ssl3_get_key_exchange(s);
 247                         if (ret <= 0) goto end;
 248                         s->state=SSL3_ST_CR_CERT_REQ_A;
 249                         s->init_num=0;
 250
 251                         /* at this point we check that we have the
 252                          * required stuff from the server */
 253                         if (!ssl3_check_cert_and_algorithm(s))
 254                                 {
 255                                 ret= -1;
 256                                 goto end;
 257                                 }
 258                         break;
 259
 260                 case SSL3_ST_CR_CERT_REQ_A:
 261                 case SSL3_ST_CR_CERT_REQ_B:
 262                         ret=ssl3_get_certificate_request(s);
 263                         if (ret <= 0) goto end;
 264                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 265                         s->init_num=0;
 266                         break;
 267
 268                 case SSL3_ST_CR_SRVR_DONE_A:
 269                 case SSL3_ST_CR_SRVR_DONE_B:
 270                         ret=ssl3_get_server_done(s);
 271                         if (ret <= 0) goto end;
 272                         if (s->s3->tmp.cert_req)
 273                                 s->state=SSL3_ST_CW_CERT_A;
 274                         else
 275                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 276                         s->init_num=0;
 277
 278                         break;
 279
 280                 case SSL3_ST_CW_CERT_A:
 281                 case SSL3_ST_CW_CERT_B:
 282                 case SSL3_ST_CW_CERT_C:
 283                         ret=ssl3_send_client_certificate(s);
 284                         if (ret <= 0) goto end;
 285                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 286                         s->init_num=0;
 287                         break;
 288
 289                 case SSL3_ST_CW_KEY_EXCH_A:
 290                 case SSL3_ST_CW_KEY_EXCH_B:
 291                         ret=ssl3_send_client_key_exchange(s);
 292                         if (ret <= 0) goto end;
 293                         l=s->s3->tmp.new_cipher->algorithms;
 294                         /* EAY EAY EAY need to check for DH fix cert
 295                          * sent back */
 296                         /* For TLS, cert_req is set to 2, so a cert chain
 297                          * of nothing is sent, but no verify packet is sent */
 298                         if (s->s3->tmp.cert_req == 1)
 299                                 {
 300                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 301                                 }
 302                         else
 303                                 {
 304                                 s->state=SSL3_ST_CW_CHANGE_A;
 305                                 s->s3->change_cipher_spec=0;
 306                                 }
 307
 308                         s->init_num=0;
 309                         break;
 310
 311                 case SSL3_ST_CW_CERT_VRFY_A:
 312                 case SSL3_ST_CW_CERT_VRFY_B:
 313                         ret=ssl3_send_client_verify(s);
 314                         if (ret <= 0) goto end;
 315                         s->state=SSL3_ST_CW_CHANGE_A;
 316                         s->init_num=0;
 317                         s->s3->change_cipher_spec=0;
 318                         break;
 319
 320                 case SSL3_ST_CW_CHANGE_A:
 321                 case SSL3_ST_CW_CHANGE_B:
 322                         ret=ssl3_send_change_cipher_spec(s,
 323                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 324                         if (ret <= 0) goto end;
 325                         s->state=SSL3_ST_CW_FINISHED_A;
 326                         s->init_num=0;
 327
 328                         s->session->cipher=s->s3->tmp.new_cipher;
 329                         if (!s->method->ssl3_enc->setup_key_block(s))
 330                                 {
 331                                 ret= -1;
 332                                 goto end;
 333                                 }
 334
 335                         if (!s->method->ssl3_enc->change_cipher_state(s,
 336                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 337                                 {
 338                                 ret= -1;
 339                                 goto end;
 340                                 }
 341
 342                         break;
 343
 344                 case SSL3_ST_CW_FINISHED_A:
 345                 case SSL3_ST_CW_FINISHED_B:
 346                         ret=ssl3_send_finished(s,
 347                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 348                                 s->method->ssl3_enc->client_finished,
 349                                 s->method->ssl3_enc->client_finished_len);
 350                         if (ret <= 0) goto end;
 351                         s->state=SSL3_ST_CW_FLUSH;
 352
 353                         /* clear flags */
 354                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 355                         if (s->hit)
 356                                 {
 357                                 s->s3->tmp.next_state=SSL_ST_OK;
 358                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 359                                         {
 360                                         s->state=SSL_ST_OK;
 361                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 362                                         s->s3->delay_buf_pop_ret=0;
 363                                         }
 364                                 }
 365                         else
 366                                 {
 367                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 368                                 }
 369                         s->init_num=0;
 370                         break;
 371
 372                 case SSL3_ST_CR_FINISHED_A:
 373                 case SSL3_ST_CR_FINISHED_B:
 374
 375                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 376                                 SSL3_ST_CR_FINISHED_B);
 377                         if (ret <= 0) goto end;
 378
 379                         if (s->hit)
 380                                 s->state=SSL3_ST_CW_CHANGE_A;
 381                         else
 382                                 s->state=SSL_ST_OK;
 383                         s->init_num=0;
 384                         break;
 385
 386                 case SSL3_ST_CW_FLUSH:
 387                         /* number of bytes to be flushed */
 388                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 389                         if (num1 > 0)
 390                                 {
 391                                 s->rwstate=SSL_WRITING;
 392                                 num1=BIO_flush(s->wbio);
 393                                 if (num1 <= 0) { ret= -1; goto end; }
 394                                 s->rwstate=SSL_NOTHING;
 395                                 }
 396
 397                         s->state=s->s3->tmp.next_state;
 398                         break;
 399
 400                 case SSL_ST_OK:
 401                         /* clean a few things up */
 402                         ssl3_cleanup_key_block(s);
 403
 404                         BUF_MEM_free(s->init_buf);
 405                         s->init_buf=NULL;
 406
 407                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 408                                 {
 409                                 /* remove buffering */
 410                                 under=BIO_pop(s->wbio);
 411                                 if (under != NULL)
 412                                         s->wbio=under;
 413                                 else
 414                                         abort(); /* ok */
 415
 416                                 BIO_free(s->bbio);
 417                                 s->bbio=NULL;
 418                                 }
 419                         /* else do it later */
 420
 421                         s->init_num=0;
 422                         s->new_session=0;
 423
 424                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 425                         if (s->hit) s->ctx->sess_hit++;
 426
 427                         ret=1;
 428                         /* s->server=0; */
 429                         s->handshake_func=ssl3_connect;
 430                         s->ctx->sess_connect_good++;
 431
 432                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 433
 434                         goto end;
 435                         /* break; */
 436
 437                 default:
 438                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 439                         ret= -1;
 440                         goto end;
 441                         /* break; */
 442                         }
 443
 444                 /* did we do anything */
 445                 if (!s->s3->tmp.reuse_message && !skip)
 446                         {
 447                         if (s->debug)
 448                                 {
 449                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 450                                         goto end;
 451                                 }
 452
 453                         if ((cb != NULL) && (s->state != state))
 454                                 {
 455                                 new_state=s->state;
 456                                 s->state=state;
 457                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 458                                 s->state=new_state;
 459                                 }
 460                         }
 461                 skip=0;
 462                 }
 463 end:
 464         if (cb != NULL)
 465                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 466         s->in_handshake--;
 467         return(ret);
 468         }
 469
 470
 471 static int ssl3_client_hello(s)
 472 SSL *s;
 473         {
 474         unsigned char *buf;
 475         unsigned char *p,*d;
 476         int i;
 477         unsigned long Time,l;
 478
 479         buf=(unsigned char *)s->init_buf->data;
 480         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 481                 {
 482                 if ((s->session == NULL) ||
 483                         (s->session->ssl_version != s->version) ||
 484                         (s->session->not_resumable))
 485                         {
 486                         if (!ssl_get_new_session(s,0))
 487                                 goto err;
 488                         }
 489                 /* else use the pre-loaded session */
 490
 491                 p=s->s3->client_random;
 492                 Time=time(NULL);                        /* Time */
 493                 l2n(Time,p);
 494                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 495
 496                 /* Do the message type and length last */
 497                 d=p= &(buf[4]);
 498
 499                 *(p++)=s->version>>8;
 500                 *(p++)=s->version&0xff;
 501
 502                 /* Random stuff */
 503                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 504                 p+=SSL3_RANDOM_SIZE;
 505
 506                 /* Session ID */
 507                 if (s->new_session)
 508                         i=0;
 509                 else
 510                         i=s->session->session_id_length;
 511                 *(p++)=i;
 512                 if (i != 0)
 513                         {
 514                         memcpy(p,s->session->session_id,i);
 515                         p+=i;
 516                         }
 517
 518                 /* Ciphers supported */
 519                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 520                 if (i == 0)
 521                         {
 522                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 523                         goto err;
 524                         }
 525                 s2n(i,p);
 526                 p+=i;
 527
 528                 /* hardwire in the NULL compression algorithm. */
 529                 /* COMPRESSION */
 530                 *(p++)=1;
 531                 *(p++)=0;
 532
 533                 l=(p-d);
 534                 d=buf;
 535                 *(d++)=SSL3_MT_CLIENT_HELLO;
 536                 l2n3(l,d);
 537
 538                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 539                 /* number of bytes to write */
 540                 s->init_num=p-buf;
 541                 s->init_off=0;
 542                 }
 543
 544         /* SSL3_ST_CW_CLNT_HELLO_B */
 545         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 546 err:
 547         return(-1);
 548         }
 549
 550 static int ssl3_get_server_hello(s)
 551 SSL *s;
 552         {
 553         STACK *sk;
 554         SSL_CIPHER *c;
 555         unsigned char *p,*d;
 556         int i,al,ok;
 557         unsigned int j;
 558         long n;
 559
 560         n=ssl3_get_message(s,
 561                 SSL3_ST_CR_SRVR_HELLO_A,
 562                 SSL3_ST_CR_SRVR_HELLO_B,
 563                 SSL3_MT_SERVER_HELLO,
 564                 300, /* ?? */
 565                 &ok);
 566
 567         if (!ok) return((int)n);
 568         d=p=(unsigned char *)s->init_buf->data;
 569
 570         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 571                 {
 572                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 573                 s->version=(s->version&0xff00)|p[1];
 574                 al=SSL_AD_PROTOCOL_VERSION;
 575                 goto f_err;
 576                 }
 577         p+=2;
 578
 579         /* load the server hello data */
 580         /* load the server random */
 581         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 582         p+=SSL3_RANDOM_SIZE;
 583
 584         /* get the session-id */
 585         j= *(p++);
 586
 587         if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
 588                 {
 589                 /* SSLref returns 16 :-( */
 590                 if (j < SSL2_SSL_SESSION_ID_LENGTH)
 591                         {
 592                         al=SSL_AD_ILLEGAL_PARAMETER;
 593                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
 594                         goto f_err;
 595                         }
 596                 }
 597         if ((j != 0) && (j == s->session->session_id_length) &&
 598                 (memcmp(p,s->session->session_id,j) == 0))
 599                 s->hit=1;
 600         else    /* a miss or crap from the other end */
 601                 {
 602                 /* If we were trying for session-id reuse, make a new
 603                  * SSL_SESSION so we don't stuff up other people */
 604                 s->hit=0;
 605                 if (s->session->session_id_length > 0)
 606                         {
 607                         if (!ssl_get_new_session(s,0))
 608                                 {
 609                                 al=SSL_AD_INTERNAL_ERROR;
 610                                 goto f_err;
 611                                 }
 612                         }
 613                 s->session->session_id_length=j;
 614                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 615                 }
 616         p+=j;
 617         c=ssl_get_cipher_by_char(s,p);
 618         if (c == NULL)
 619                 {
 620                 /* unknown cipher */
 621                 al=SSL_AD_ILLEGAL_PARAMETER;
 622                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 623                 goto f_err;
 624                 }
 625         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 626
 627         sk=ssl_get_ciphers_by_id(s);
 628         i=sk_find(sk,(char *)c);
 629         if (i < 0)
 630                 {
 631                 /* we did not say we would use this cipher */
 632                 al=SSL_AD_ILLEGAL_PARAMETER;
 633                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 634                 goto f_err;
 635                 }
 636
 637         if (s->hit && (s->session->cipher != c))
 638                 {
 639                 if (!(s->options &
 640                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 641                         {
 642                         al=SSL_AD_ILLEGAL_PARAMETER;
 643                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 644                         goto f_err;
 645                         }
 646                 }
 647         s->s3->tmp.new_cipher=c;
 648
 649         /* lets get the compression algorithm */
 650         /* COMPRESSION */
 651         j= *(p++);
 652         if (j != 0)
 653                 {
 654                 al=SSL_AD_ILLEGAL_PARAMETER;
 655                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 656                 goto f_err;
 657                 }
 658
 659         if (p != (d+n))
 660                 {
 661                 /* wrong packet length */
 662                 al=SSL_AD_DECODE_ERROR;
 663                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 664                 goto err;
 665                 }
 666
 667         return(1);
 668 f_err:
 669         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 670 err:
 671         return(-1);
 672         }
 673
 674 static int ssl3_get_server_certificate(s)
 675 SSL *s;
 676         {
 677         int al,i,ok,ret= -1;
 678         unsigned long n,nc,llen,l;
 679         X509 *x=NULL;
 680         unsigned char *p,*d,*q;
 681         STACK *sk=NULL;
 682         CERT *c;
 683         EVP_PKEY *pkey=NULL;
 684
 685         n=ssl3_get_message(s,
 686                 SSL3_ST_CR_CERT_A,
 687                 SSL3_ST_CR_CERT_B,
 688                 -1,
 689 #if defined(MSDOS) && !defined(WIN32)
 690                 1024*30, /* 30k max cert list :-) */
 691 #else
 692                 1024*100, /* 100k max cert list :-) */
 693 #endif
 694                 &ok);
 695
 696         if (!ok) return((int)n);
 697
 698         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 699                 {
 700                 s->s3->tmp.reuse_message=1;
 701                 return(1);
 702                 }
 703
 704         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 705                 {
 706                 al=SSL_AD_UNEXPECTED_MESSAGE;
 707                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 708                 goto f_err;
 709                 }
 710         d=p=(unsigned char *)s->init_buf->data;
 711
 712         if ((sk=sk_new_null()) == NULL)
 713                 {
 714                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 715                 goto err;
 716                 }
 717
 718         n2l3(p,llen);
 719         if (llen+3 != n)
 720                 {
 721                 al=SSL_AD_DECODE_ERROR;
 722                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 723                 goto f_err;
 724                 }
 725         for (nc=0; nc<llen; )
 726                 {
 727                 n2l3(p,l);
 728                 if ((l+nc+3) > llen)
 729                         {
 730                         al=SSL_AD_DECODE_ERROR;
 731                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 732                         goto f_err;
 733                         }
 734
 735                 q=p;
 736                 x=d2i_X509(NULL,&q,l);
 737                 if (x == NULL)
 738                         {
 739                         al=SSL_AD_BAD_CERTIFICATE;
 740                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 741                         goto f_err;
 742                         }
 743                 if (q != (p+l))
 744                         {
 745                         al=SSL_AD_DECODE_ERROR;
 746                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 747                         goto f_err;
 748                         }
 749                 if (!sk_push(sk,(char *)x))
 750                         {
 751                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 752                         goto err;
 753                         }
 754                 x=NULL;
 755                 nc+=l+3;
 756                 p=q;
 757                 }
 758
 759         i=ssl_verify_cert_chain(s,sk);
 760         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 761                 {
 762                 al=ssl_verify_alarm_type(s->verify_result);
 763                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 764                 goto f_err;
 765                 }
 766
 767         c=ssl_cert_new();
 768         if (c == NULL) goto err;
 769
 770         if (s->session->cert) ssl_cert_free(s->session->cert);
 771         s->session->cert=c;
 772
 773         c->cert_chain=sk;
 774         x=(X509 *)sk_value(sk,0);
 775         sk=NULL;
 776
 777         pkey=X509_get_pubkey(x);
 778
 779         if ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))
 780                 {
 781                 x=NULL;
 782                 al=SSL3_AL_FATAL;
 783                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 784                 goto f_err;
 785                 }
 786
 787         i=ssl_cert_type(x,pkey);
 788         if (i < 0)
 789                 {
 790                 x=NULL;
 791                 al=SSL3_AL_FATAL;
 792                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 793                 goto f_err;
 794                 }
 795
 796         c->cert_type=i;
 797         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 798         if (c->pkeys[i].x509 != NULL)
 799                 X509_free(c->pkeys[i].x509);
 800         c->pkeys[i].x509=x;
 801         c->key= &(c->pkeys[i]);
 802
 803         if ((s->session != NULL) && (s->session->peer != NULL))
 804                 X509_free(s->session->peer);
 805         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 806         s->session->peer=x;
 807
 808         x=NULL;
 809         ret=1;
 810
 811         if (0)
 812                 {
 813 f_err:
 814                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 815                 }
 816 err:
 817         if (x != NULL) X509_free(x);
 818         if (sk != NULL) sk_pop_free(sk,X509_free);
 819         return(ret);
 820         }
 821
 822 static int ssl3_get_key_exchange(s)
 823 SSL *s;
 824         {
 825 #ifndef NO_RSA
 826         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 827 #endif
 828         EVP_MD_CTX md_ctx;
 829         unsigned char *param,*p;
 830         int al,i,j,param_len,ok;
 831         long n,alg;
 832         EVP_PKEY *pkey=NULL;
 833         RSA *rsa=NULL;
 834 #ifndef NO_DH
 835         DH *dh=NULL;
 836 #endif
 837
 838         n=ssl3_get_message(s,
 839                 SSL3_ST_CR_KEY_EXCH_A,
 840                 SSL3_ST_CR_KEY_EXCH_B,
 841                 -1,
 842                 1024*8, /* ?? */
 843                 &ok);
 844
 845         if (!ok) return((int)n);
 846
 847         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 848                 {
 849                 s->s3->tmp.reuse_message=1;
 850                 return(1);
 851                 }
 852
 853         param=p=(unsigned char *)s->init_buf->data;
 854
 855         if (s->session->cert != NULL)
 856                 {
 857 #ifndef NO_RSA
 858                 if (s->session->cert->rsa_tmp != NULL)
 859                         {
 860                         RSA_free(s->session->cert->rsa_tmp);
 861                         s->session->cert->rsa_tmp=NULL;
 862                         }
 863 #endif
 864 #ifndef NO_DH
 865                 if (s->session->cert->dh_tmp)
 866                         {
 867                         DH_free(s->session->cert->dh_tmp);
 868                         s->session->cert->dh_tmp=NULL;
 869                         }
 870 #endif
 871                 }
 872         else
 873                 {
 874                 s->session->cert=ssl_cert_new();
 875                 }
 876
 877         param_len=0;
 878         alg=s->s3->tmp.new_cipher->algorithms;
 879
 880 #ifndef NO_RSA
 881         if (alg & SSL_kRSA)
 882                 {
 883                 if ((rsa=RSA_new()) == NULL)
 884                         {
 885                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 886                         goto err;
 887                         }
 888                 n2s(p,i);
 889                 param_len=i+2;
 890                 if (param_len > n)
 891                         {
 892                         al=SSL_AD_DECODE_ERROR;
 893                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
 894                         goto f_err;
 895                         }
 896                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
 897                         {
 898                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 899                         goto err;
 900                         }
 901                 p+=i;
 902
 903                 n2s(p,i);
 904                 param_len+=i+2;
 905                 if (param_len > n)
 906                         {
 907                         al=SSL_AD_DECODE_ERROR;
 908                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
 909                         goto f_err;
 910                         }
 911                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
 912                         {
 913                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 914                         goto err;
 915                         }
 916                 p+=i;
 917                 n-=param_len;
 918
 919 /*              s->session->cert->rsa_tmp=rsa;*/
 920                 /* this should be because we are using an export cipher */
 921                 if (alg & SSL_aRSA)
 922                         pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509);
 923                 else
 924                         {
 925                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
 926                         goto err;
 927                         }
 928                 s->session->cert->rsa_tmp=rsa;
 929                 }
 930         else
 931 #endif
 932 #ifndef NO_DH
 933                 if (alg & SSL_kEDH)
 934                 {
 935                 if ((dh=DH_new()) == NULL)
 936                         {
 937                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
 938                         goto err;
 939                         }
 940                 n2s(p,i);
 941                 param_len=i+2;
 942                 if (param_len > n)
 943                         {
 944                         al=SSL_AD_DECODE_ERROR;
 945                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
 946                         goto f_err;
 947                         }
 948                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
 949                         {
 950                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 951                         goto err;
 952                         }
 953                 p+=i;
 954
 955                 n2s(p,i);
 956                 param_len+=i+2;
 957                 if (param_len > n)
 958                         {
 959                         al=SSL_AD_DECODE_ERROR;
 960                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
 961                         goto f_err;
 962                         }
 963                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
 964                         {
 965                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 966                         goto err;
 967                         }
 968                 p+=i;
 969
 970                 n2s(p,i);
 971                 param_len+=i+2;
 972                 if (param_len > n)
 973                         {
 974                         al=SSL_AD_DECODE_ERROR;
 975                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
 976                         goto f_err;
 977                         }
 978                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
 979                         {
 980                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 981                         goto err;
 982                         }
 983                 p+=i;
 984                 n-=param_len;
 985
 986 #ifndef NO_RSA
 987                 if (alg & SSL_aRSA)
 988                         pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509);
 989                 else
 990 #endif
 991 #ifndef NO_DSA
 992                 if (alg & SSL_aDSS)
 993                         pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_DSA_SIGN].x509);
 994 #endif
 995                 /* else anonymous DH, so no certificate or pkey. */
 996
 997                 s->session->cert->dh_tmp=dh;
 998                 }
 999         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1000                 {
1001                 al=SSL_AD_ILLEGAL_PARAMETER;
1002                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1003                 goto f_err;
1004                 }
1005 #endif
1006         if (alg & SSL_aFZA)
1007                 {
1008                 al=SSL_AD_HANDSHAKE_FAILURE;
1009                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1010                 goto f_err;
1011                 }
1012
1013
1014         /* p points to the next byte, there are 'n' bytes left */
1015
1016
1017         /* if it was signed, check the signature */
1018         if (pkey != NULL)
1019                 {
1020                 n2s(p,i);
1021                 n-=2;
1022                 j=EVP_PKEY_size(pkey);
1023
1024                 if ((i != n) || (n > j) || (n <= 0))
1025                         {
1026                         /* wrong packet length */
1027                         al=SSL_AD_DECODE_ERROR;
1028                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1029                         goto f_err;
1030                         }
1031
1032 #ifndef NO_RSA
1033                 if (pkey->type == EVP_PKEY_RSA)
1034                         {
1035                         int num;
1036
1037                         j=0;
1038                         q=md_buf;
1039                         for (num=2; num > 0; num--)
1040                                 {
1041                                 EVP_DigestInit(&md_ctx,(num == 2)
1042                                         ?s->ctx->md5:s->ctx->sha1);
1043                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1044                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1045                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1046                                 EVP_DigestFinal(&md_ctx,q,(unsigned int *)&i);
1047                                 q+=i;
1048                                 j+=i;
1049                                 }
1050                         i=RSA_public_decrypt((int)n,p,p,pkey->pkey.rsa,
1051                                 RSA_PKCS1_PADDING);
1052                         if (i <= 0)
1053                                 {
1054                                 al=SSL_AD_DECRYPT_ERROR;
1055                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1056                                 goto f_err;
1057                                 }
1058                         if ((j != i) || (memcmp(p,md_buf,i) != 0))
1059                                 {
1060                                 /* bad signature */
1061                                 al=SSL_AD_DECRYPT_ERROR;
1062                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1063                                 goto f_err;
1064                                 }
1065                         }
1066                 else
1067 #endif
1068 #ifndef NO_DSA
1069                         if (pkey->type == EVP_PKEY_DSA)
1070                         {
1071                         /* lets do DSS */
1072                         EVP_VerifyInit(&md_ctx,EVP_dss1());
1073                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1074                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1075                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1076                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1077                                 {
1078                                 /* bad signature */
1079                                 al=SSL_AD_DECRYPT_ERROR;
1080                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1081                                 goto f_err;
1082                                 }
1083                         }
1084                 else
1085 #endif
1086                         {
1087                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1088                         goto err;
1089                         }
1090                 }
1091         else
1092                 {
1093                 /* still data left over */
1094                 if (!(alg & SSL_aNULL))
1095                         {
1096                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1097                         goto err;
1098                         }
1099                 if (n != 0)
1100                         {
1101                         al=SSL_AD_DECODE_ERROR;
1102                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1103                         goto f_err;
1104                         }
1105                 }
1106
1107         return(1);
1108 f_err:
1109         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1110 err:
1111         return(-1);
1112         }
1113
1114 static int ssl3_get_certificate_request(s)
1115 SSL *s;
1116         {
1117         int ok,ret=0;
1118         unsigned long n,nc,l;
1119         unsigned int llen,ctype_num,i;
1120         X509_NAME *xn=NULL;
1121         unsigned char *p,*d,*q;
1122         STACK *ca_sk=NULL;
1123
1124         n=ssl3_get_message(s,
1125                 SSL3_ST_CR_CERT_REQ_A,
1126                 SSL3_ST_CR_CERT_REQ_B,
1127                 -1,
1128 #if defined(MSDOS) && !defined(WIN32)
1129                 1024*30,  /* 30k max cert list :-) */
1130 #else
1131                 1024*100, /* 100k max cert list :-) */
1132 #endif
1133                 &ok);
1134
1135         if (!ok) return((int)n);
1136
1137         s->s3->tmp.cert_req=0;
1138
1139         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1140                 {
1141                 s->s3->tmp.reuse_message=1;
1142                 return(1);
1143                 }
1144
1145         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1146                 {
1147                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1148                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1149                 goto err;
1150                 }
1151
1152         /* TLS does not like anon-DH with client cert */
1153         if (s->version > SSL3_VERSION)
1154                 {
1155                 l=s->s3->tmp.new_cipher->algorithms;
1156                 if (l & SSL_aNULL)
1157                         {
1158                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1159                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1160                         goto err;
1161                         }
1162                 }
1163
1164         d=p=(unsigned char *)s->init_buf->data;
1165
1166         if ((ca_sk=sk_new(ca_dn_cmp)) == NULL)
1167                 {
1168                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1169                 goto err;
1170                 }
1171
1172         /* get the certificate types */
1173         ctype_num= *(p++);
1174         if (ctype_num > SSL3_CT_NUMBER)
1175                 ctype_num=SSL3_CT_NUMBER;
1176         for (i=0; i<ctype_num; i++)
1177                 s->s3->tmp.ctype[i]= p[i];
1178         p+=ctype_num;
1179
1180         /* get the CA RDNs */
1181         n2s(p,llen);
1182 #if 0
1183 {
1184 FILE *out;
1185 out=fopen("/tmp/vsign.der","w");
1186 fwrite(p,1,llen,out);
1187 fclose(out);
1188 }
1189 #endif
1190
1191         if ((llen+ctype_num+2+1) != n)
1192                 {
1193                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1194                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1195                 goto err;
1196                 }
1197
1198         for (nc=0; nc<llen; )
1199                 {
1200                 n2s(p,l);
1201                 if ((l+nc+2) > llen)
1202                         {
1203                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1204                                 goto cont; /* netscape bugs */
1205                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1206                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1207                         goto err;
1208                         }
1209
1210                 q=p;
1211
1212                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1213                         {
1214                         /* If netscape tollerance is on, ignore errors */
1215                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1216                                 goto cont;
1217                         else
1218                                 {
1219                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1220                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1221                                 goto err;
1222                                 }
1223                         }
1224
1225                 if (q != (p+l))
1226                         {
1227                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1228                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1229                         goto err;
1230                         }
1231                 if (!sk_push(ca_sk,(char *)xn))
1232                         {
1233                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1234                         goto err;
1235                         }
1236
1237                 p+=l;
1238                 nc+=l+2;
1239                 }
1240
1241         if (0)
1242                 {
1243 cont:
1244                 ERR_clear_error();
1245                 }
1246
1247         /* we should setup a certficate to return.... */
1248         s->s3->tmp.cert_req=1;
1249         s->s3->tmp.ctype_num=ctype_num;
1250         if (s->s3->tmp.ca_names != NULL)
1251                 sk_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1252         s->s3->tmp.ca_names=ca_sk;
1253         ca_sk=NULL;
1254
1255         ret=1;
1256 err:
1257         if (ca_sk != NULL) sk_pop_free(ca_sk,X509_NAME_free);
1258         return(ret);
1259         }
1260
1261 static int ca_dn_cmp(a,b)
1262 X509_NAME **a,**b;
1263         {
1264         return(X509_NAME_cmp(*a,*b));
1265         }
1266
1267 static int ssl3_get_server_done(s)
1268 SSL *s;
1269         {
1270         int ok,ret=0;
1271         long n;
1272
1273         n=ssl3_get_message(s,
1274                 SSL3_ST_CR_SRVR_DONE_A,
1275                 SSL3_ST_CR_SRVR_DONE_B,
1276                 SSL3_MT_SERVER_DONE,
1277                 30, /* should be very small, like 0 :-) */
1278                 &ok);
1279
1280         if (!ok) return((int)n);
1281         if (n > 0)
1282                 {
1283                 /* should contain no data */
1284                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1285                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1286                 }
1287         ret=1;
1288         return(ret);
1289         }
1290
1291 static int ssl3_send_client_key_exchange(s)
1292 SSL *s;
1293         {
1294         unsigned char *p,*q,*d;
1295         int n;
1296         unsigned long l;
1297         EVP_PKEY *pkey=NULL;
1298
1299         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1300                 {
1301                 d=(unsigned char *)s->init_buf->data;
1302                 p= &(d[4]);
1303
1304                 l=s->s3->tmp.new_cipher->algorithms;
1305
1306 #ifndef NO_RSA
1307                 if (l & SSL_kRSA)
1308                         {
1309                         RSA *rsa;
1310                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1311
1312                         if (s->session->cert->rsa_tmp != NULL)
1313                                 rsa=s->session->cert->rsa_tmp;
1314                         else
1315                                 {
1316                                 pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509);
1317                                 if ((pkey == NULL) ||
1318                                         (pkey->type != EVP_PKEY_RSA) ||
1319                                         (pkey->pkey.rsa == NULL))
1320                                         {
1321                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1322                                         goto err;
1323                                         }
1324                                 rsa=pkey->pkey.rsa;
1325                                 }
1326
1327                         tmp_buf[0]=s->version>>8;
1328                         tmp_buf[1]=s->version&0xff;
1329                         RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1330
1331                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1332
1333                         q=p;
1334                         /* Fix buf for TLS and beyond */
1335                         if (s->version > SSL3_VERSION)
1336                                 p+=2;
1337                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1338                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1339 #ifdef PKCS1_CHECK
1340                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1341                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1342 #endif
1343                         if (n <= 0)
1344                                 {
1345                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1346                                 goto err;
1347                                 }
1348
1349                         /* Fix buf for TLS and beyond */
1350                         if (s->version > SSL3_VERSION)
1351                                 {
1352                                 s2n(n,q);
1353                                 n+=2;
1354                                 }
1355
1356                         s->session->master_key_length=
1357                                 s->method->ssl3_enc->generate_master_secret(s,
1358                                         s->session->master_key,
1359                                         tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1360                         memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1361                         }
1362                 else
1363 #endif
1364 #ifndef NO_DH
1365                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1366                         {
1367                         DH *dh_srvr,*dh_clnt;
1368
1369                         if (s->session->cert->dh_tmp != NULL)
1370                                 dh_srvr=s->session->cert->dh_tmp;
1371                         else
1372                                 {
1373                                 /* we get them from the cert */
1374                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1375                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1376                                 goto err;
1377                                 }
1378
1379                         /* generate a new random key */
1380                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1381                                 {
1382                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1383                                 goto err;
1384                                 }
1385                         if (!DH_generate_key(dh_clnt))
1386                                 {
1387                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1388                                 goto err;
1389                                 }
1390
1391                         /* use the 'p' output buffer for the DH key, but
1392                          * make sure to clear it out afterwards */
1393
1394                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1395
1396                         if (n <= 0)
1397                                 {
1398                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1399                                 goto err;
1400                                 }
1401
1402                         /* generate master key from the result */
1403                         s->session->master_key_length=
1404                                 s->method->ssl3_enc->generate_master_secret(s,
1405                                         s->session->master_key,p,n);
1406                         /* clean up */
1407                         memset(p,0,n);
1408
1409                         /* send off the data */
1410                         n=BN_num_bytes(dh_clnt->pub_key);
1411                         s2n(n,p);
1412                         BN_bn2bin(dh_clnt->pub_key,p);
1413                         n+=2;
1414
1415                         DH_free(dh_clnt);
1416
1417                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1418                         }
1419                 else
1420 #endif
1421                         {
1422                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1423                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1424                         goto err;
1425                         }
1426
1427                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1428                 l2n3(n,d);
1429
1430                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1431                 /* number of bytes to write */
1432                 s->init_num=n+4;
1433                 s->init_off=0;
1434                 }
1435
1436         /* SSL3_ST_CW_KEY_EXCH_B */
1437         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1438 err:
1439         return(-1);
1440         }
1441
1442 static int ssl3_send_client_verify(s)
1443 SSL *s;
1444         {
1445         unsigned char *p,*d;
1446         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1447         EVP_PKEY *pkey;
1448         int i=0;
1449         unsigned long n;
1450 #ifndef NO_DSA
1451         int j;
1452 #endif
1453
1454         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1455                 {
1456                 d=(unsigned char *)s->init_buf->data;
1457                 p= &(d[4]);
1458                 pkey=s->cert->key->privatekey;
1459
1460                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1461                         &(data[MD5_DIGEST_LENGTH]));
1462
1463 #ifndef NO_RSA
1464                 if (pkey->type == EVP_PKEY_RSA)
1465                         {
1466                         s->method->ssl3_enc->cert_verify_mac(s,
1467                                 &(s->s3->finish_dgst1),&(data[0]));
1468                         i=RSA_private_encrypt(
1469                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1470                                 data,&(p[2]),pkey->pkey.rsa,
1471                                 RSA_PKCS1_PADDING);
1472                         if (i <= 0)
1473                                 {
1474                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1475                                 goto err;
1476                                 }
1477                         s2n(i,p);
1478                         n=i+2;
1479                         }
1480                 else
1481 #endif
1482 #ifndef NO_DSA
1483                         if (pkey->type == EVP_PKEY_DSA)
1484                         {
1485                         if (!DSA_sign(pkey->save_type,
1486                                 &(data[MD5_DIGEST_LENGTH]),
1487                                 SHA_DIGEST_LENGTH,&(p[2]),
1488                                 (unsigned int *)&j,pkey->pkey.dsa))
1489                                 {
1490                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1491                                 goto err;
1492                                 }
1493                         s2n(j,p);
1494                         n=j+2;
1495                         }
1496                 else
1497 #endif
1498                         {
1499                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,SSL_R_INTERNAL_ERROR);
1500                         goto err;
1501                         }
1502                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1503                 l2n3(n,d);
1504
1505                 s->init_num=(int)n+4;
1506                 s->init_off=0;
1507                 }
1508         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1509 err:
1510         return(-1);
1511         }
1512
1513 static int ssl3_send_client_certificate(s)
1514 SSL *s;
1515         {
1516         X509 *x509=NULL;
1517         EVP_PKEY *pkey=NULL;
1518         int i;
1519         unsigned long l;
1520
1521         if (s->state == SSL3_ST_CW_CERT_A)
1522                 {
1523                 if ((s->cert == NULL) ||
1524                         (s->cert->key->x509 == NULL) ||
1525                         (s->cert->key->privatekey == NULL))
1526                         s->state=SSL3_ST_CW_CERT_B;
1527                 else
1528                         s->state=SSL3_ST_CW_CERT_C;
1529                 }
1530
1531         /* We need to get a client cert */
1532         if (s->state == SSL3_ST_CW_CERT_B)
1533                 {
1534                 /* If we get an error, we need to
1535                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1536                  * We then get retied later */
1537                 i=0;
1538                 if (s->ctx->client_cert_cb != NULL)
1539                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1540                 if (i < 0)
1541                         {
1542                         s->rwstate=SSL_X509_LOOKUP;
1543                         return(-1);
1544                         }
1545                 s->rwstate=SSL_NOTHING;
1546                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1547                         {
1548                         s->state=SSL3_ST_CW_CERT_B;
1549                         if (    !SSL_use_certificate(s,x509) ||
1550                                 !SSL_use_PrivateKey(s,pkey))
1551                                 i=0;
1552                         }
1553                 else if (i == 1)
1554                         {
1555                         i=0;
1556                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1557                         }
1558
1559                 if (x509 != NULL) X509_free(x509);
1560                 if (pkey != NULL) EVP_PKEY_free(pkey);
1561                 if (i == 0)
1562                         {
1563                         if (s->version == SSL3_VERSION)
1564                                 {
1565                                 s->s3->tmp.cert_req=0;
1566                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1567                                 return(1);
1568                                 }
1569                         else
1570                                 {
1571                                 s->s3->tmp.cert_req=2;
1572                                 }
1573                         }
1574
1575                 /* Ok, we have a cert */
1576                 s->state=SSL3_ST_CW_CERT_C;
1577                 }
1578
1579         if (s->state == SSL3_ST_CW_CERT_C)
1580                 {
1581                 s->state=SSL3_ST_CW_CERT_D;
1582                 l=ssl3_output_cert_chain(s,
1583                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1584                 s->init_num=(int)l;
1585                 s->init_off=0;
1586                 }
1587         /* SSL3_ST_CW_CERT_D */
1588         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1589         }
1590
1591 #define has_bits(i,m)   (((i)&(m)) == (m))
1592
1593 static int ssl3_check_cert_and_algorithm(s)
1594 SSL *s;
1595         {
1596         int i,idx;
1597         long algs;
1598         EVP_PKEY *pkey=NULL;
1599         CERT *c;
1600         RSA *rsa;
1601         DH *dh;
1602
1603         c=s->session->cert;
1604
1605         if (c == NULL)
1606                 {
1607                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_INTERNAL_ERROR);
1608                 goto err;
1609                 }
1610
1611         algs=s->s3->tmp.new_cipher->algorithms;
1612
1613         /* we don't have a certificate */
1614         if (algs & (SSL_aDH|SSL_aNULL))
1615                 return(1);
1616
1617         rsa=s->session->cert->rsa_tmp;
1618         dh=s->session->cert->dh_tmp;
1619
1620         /* This is the passed certificate */
1621
1622         idx=c->cert_type;
1623         pkey=X509_get_pubkey(c->pkeys[idx].x509);
1624         i=X509_certificate_type(c->pkeys[idx].x509,pkey);
1625
1626
1627         /* Check that we have a certificate if we require one */
1628         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1629                 {
1630                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1631                 goto f_err;
1632                 }
1633 #ifndef NO_DSA
1634         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1635                 {
1636                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1637                 goto f_err;
1638                 }
1639 #endif
1640
1641         if ((algs & SSL_kRSA) &&
1642                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1643                 {
1644                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1645                 goto f_err;
1646                 }
1647 #ifndef NO_DH
1648         else if ((algs & SSL_kEDH) &&
1649                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1650                 {
1651                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1652                 goto f_err;
1653                 }
1654         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1655                 {
1656                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1657                 goto f_err;
1658                 }
1659 #ifndef NO_DSA
1660         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1661                 {
1662                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1663                 goto f_err;
1664                 }
1665 #endif
1666 #endif
1667
1668         if ((algs & SSL_EXP) && !has_bits(i,EVP_PKT_EXP))
1669                 {
1670 #ifndef NO_RSA
1671                 if (algs & SSL_kRSA)
1672                         {
1673                         if ((rsa == NULL) || (RSA_size(rsa) > 512))
1674                                 {
1675                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1676                                 goto f_err;
1677                                 }
1678                         }
1679                 else
1680 #endif
1681 #ifndef NO_DH
1682                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1683                         {
1684                         if ((dh == NULL) || (DH_size(dh) > 512))
1685                                 {
1686                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1687                                 goto f_err;
1688                                 }
1689                         }
1690                 else
1691 #endif
1692                         {
1693                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1694                         goto f_err;
1695                         }
1696                 }
1697         return(1);
1698 f_err:
1699         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1700 err:
1701         return(0);
1702         }
1703