ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1997 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 int ssl3_client_hello(SSL *s);
  78 static int ssl3_get_server_hello(SSL *s);
  79 static int ssl3_get_certificate_request(SSL *s);
  80 static int ca_dn_cmp(X509_NAME **a,X509_NAME **b);
  81 static int ssl3_get_server_done(SSL *s);
  82 static int ssl3_send_client_verify(SSL *s);
  83 static int ssl3_send_client_certificate(SSL *s);
  84 static int ssl3_send_client_key_exchange(SSL *s);
  85 static int ssl3_get_key_exchange(SSL *s);
  86 static int ssl3_get_server_certificate(SSL *s);
  87 static int ssl3_check_cert_and_algorithm(SSL *s);
  88 #else
  89 static int ssl3_client_hello();
  90 static int ssl3_get_server_hello();
  91 static int ssl3_get_certificate_request();
  92 static int ca_dn_cmp();
  93 static int ssl3_get_server_done();
  94 static int ssl3_send_client_verify();
  95 static int ssl3_send_client_certificate();
  96 static int ssl3_send_client_key_exchange();
  97 static int ssl3_get_key_exchange();
  98 static int ssl3_get_server_certificate();
  99 static int ssl3_check_cert_and_algorithm();
 100 #endif
 101
 102 static SSL_METHOD *ssl3_get_client_method(ver)
 103 int ver;
 104         {
 105         if (ver == 3)
 106                 return(SSLv3_client_method());
 107         else
 108                 return(NULL);
 109         }
 110
 111 SSL_METHOD *SSLv3_client_method()
 112         {
 113         static int init=1;
 114         static SSL_METHOD SSLv3_client_data;
 115
 116         if (init)
 117                 {
 118                 init=0;
 119                 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
 120                         sizeof(SSL_METHOD));
 121                 SSLv3_client_data.ssl_connect=ssl3_connect;
 122                 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
 123                 }
 124         return(&SSLv3_client_data);
 125         }
 126
 127 int ssl3_connect(s)
 128 SSL *s;
 129         {
 130         BUF_MEM *buf;
 131         unsigned long Time=time(NULL),l;
 132         long num1;
 133         void (*cb)()=NULL;
 134         int ret= -1;
 135         BIO *bbio,*under;
 136         int new_state,state,skip=0;;
 137
 138         RAND_seed((unsigned char *)&Time,sizeof(Time));
 139         ERR_clear_error();
 140         errno=0;
 141
 142         if (s->info_callback != NULL)
 143                 cb=s->info_callback;
 144         else if (s->ctx->info_callback != NULL)
 145                 cb=s->ctx->info_callback;
 146
 147         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 148         s->in_handshake++;
 149
 150         for (;;)
 151                 {
 152                 state=s->state;
 153
 154                 switch(s->state)
 155                         {
 156                 case SSL_ST_RENEGOTIATE:
 157                         s->new_session=1;
 158                         s->state=SSL_ST_CONNECT;
 159                         /* break */
 160                 case SSL_ST_BEFORE:
 161                 case SSL_ST_CONNECT:
 162                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 163                 case SSL_ST_OK|SSL_ST_CONNECT:
 164
 165                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 166
 167                         s->version=3;
 168                         s->type=SSL_ST_CONNECT;
 169
 170                         if (s->init_buf == NULL)
 171                                 {
 172                                 if ((buf=BUF_MEM_new()) == NULL)
 173                                         {
 174                                         ret= -1;
 175                                         goto end;
 176                                         }
 177                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 178                                         {
 179                                         ret= -1;
 180                                         goto end;
 181                                         }
 182                                 s->init_buf=buf;
 183                                 }
 184
 185                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 186
 187                         /* setup buffing BIO */
 188                         if (s->bbio == NULL)
 189                                 {
 190                                 bbio=BIO_new(BIO_f_buffer());
 191                                 if (bbio == NULL)
 192                                         {
 193                                         SSLerr(SSL_F_SSL3_CONNECT,ERR_LIB_BUF);
 194                                         ret= -1;
 195                                         goto end;
 196                                         }
 197                                 s->bbio=bbio;
 198                                 }
 199                         else
 200                                 bbio=s->bbio;
 201
 202                         BIO_reset(bbio);
 203                         if (!BIO_set_write_buffer_size(bbio,16*1024))
 204                                 {
 205                                 SSLerr(SSL_F_SSL3_CONNECT,ERR_LIB_BUF);
 206                                 ret= -1;
 207                                 goto end;
 208                                 }
 209
 210                         /* don't push the buffering BIO quite yet */
 211
 212                         ssl3_init_finished_mac(s);
 213
 214                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 215                         s->ctx->sess_connect++;
 216                         s->init_num=0;
 217                         break;
 218
 219                 case SSL3_ST_CW_CLNT_HELLO_A:
 220                 case SSL3_ST_CW_CLNT_HELLO_B:
 221
 222                         s->shutdown=0;
 223                         ret=ssl3_client_hello(s);
 224                         if (ret <= 0) goto end;
 225                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 226                         s->init_num=0;
 227
 228                         /* turn on buffering for the next lot of output */
 229                         s->wbio=BIO_push(s->bbio,s->wbio);
 230
 231                         break;
 232
 233                 case SSL3_ST_CR_SRVR_HELLO_A:
 234                 case SSL3_ST_CR_SRVR_HELLO_B:
 235                         ret=ssl3_get_server_hello(s);
 236                         if (ret <= 0) goto end;
 237                         if (s->hit)
 238                                 s->state=SSL3_ST_CR_FINISHED_A;
 239                         else
 240                                 s->state=SSL3_ST_CR_CERT_A;
 241                         s->init_num=0;
 242                         break;
 243
 244                 case SSL3_ST_CR_CERT_A:
 245                 case SSL3_ST_CR_CERT_B:
 246                         /* Check if it is anon DH */
 247                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 248                                 {
 249                                 ret=ssl3_get_server_certificate(s);
 250                                 if (ret <= 0) goto end;
 251                                 }
 252                         else
 253                                 skip=1;
 254                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 255                         s->init_num=0;
 256                         break;
 257
 258                 case SSL3_ST_CR_KEY_EXCH_A:
 259                 case SSL3_ST_CR_KEY_EXCH_B:
 260                         ret=ssl3_get_key_exchange(s);
 261                         if (ret <= 0) goto end;
 262                         s->state=SSL3_ST_CR_CERT_REQ_A;
 263                         s->init_num=0;
 264
 265                         /* at this point we check that we have the
 266                          * required stuff from the server */
 267                         if (!ssl3_check_cert_and_algorithm(s))
 268                                 {
 269                                 ret= -1;
 270                                 goto end;
 271                                 }
 272                         break;
 273
 274                 case SSL3_ST_CR_CERT_REQ_A:
 275                 case SSL3_ST_CR_CERT_REQ_B:
 276                         ret=ssl3_get_certificate_request(s);
 277                         if (ret <= 0) goto end;
 278                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 279                         s->init_num=0;
 280                         break;
 281
 282                 case SSL3_ST_CR_SRVR_DONE_A:
 283                 case SSL3_ST_CR_SRVR_DONE_B:
 284                         ret=ssl3_get_server_done(s);
 285                         if (ret <= 0) goto end;
 286                         if (s->s3->tmp.cert_req)
 287                                 s->state=SSL3_ST_CW_CERT_A;
 288                         else
 289                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 290                         s->init_num=0;
 291
 292                         break;
 293
 294                 case SSL3_ST_CW_CERT_A:
 295                 case SSL3_ST_CW_CERT_B:
 296                 case SSL3_ST_CW_CERT_C:
 297                         ret=ssl3_send_client_certificate(s);
 298                         if (ret <= 0) goto end;
 299                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 300                         s->init_num=0;
 301                         break;
 302
 303                 case SSL3_ST_CW_KEY_EXCH_A:
 304                 case SSL3_ST_CW_KEY_EXCH_B:
 305                         ret=ssl3_send_client_key_exchange(s);
 306                         if (ret <= 0) goto end;
 307                         l=s->s3->tmp.new_cipher->algorithms;
 308                         /* EAY EAY EAY need to check for DH fix cert
 309                          * sent back */
 310                         if ((s->s3->tmp.cert_req) && 1)
 311                                 {
 312                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 313                                 }
 314                         else
 315                                 {
 316                                 s->state=SSL3_ST_CW_CHANGE_A;
 317                                 s->s3->change_cipher_spec=0;
 318                                 }
 319
 320                         s->init_num=0;
 321                         break;
 322
 323                 case SSL3_ST_CW_CERT_VRFY_A:
 324                 case SSL3_ST_CW_CERT_VRFY_B:
 325                         ret=ssl3_send_client_verify(s);
 326                         if (ret <= 0) goto end;
 327                         s->state=SSL3_ST_CW_CHANGE_A;
 328                         s->init_num=0;
 329                         s->s3->change_cipher_spec=0;
 330                         break;
 331
 332                 case SSL3_ST_CW_CHANGE_A:
 333                 case SSL3_ST_CW_CHANGE_B:
 334                         ret=ssl3_send_change_cipher_spec(s,
 335                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 336                         if (ret <= 0) goto end;
 337                         s->state=SSL3_ST_CW_FINISHED_A;
 338                         s->init_num=0;
 339
 340                         s->session->cipher=s->s3->tmp.new_cipher;
 341                         if (!ssl3_setup_key_block(s))
 342                                 {
 343                                 ret= -1;
 344                                 goto end;
 345                                 }
 346
 347                         if (!ssl3_change_cipher_state(s,
 348                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 349                                 {
 350                                 ret= -1;
 351                                 goto end;
 352                                 }
 353
 354                         break;
 355
 356                 case SSL3_ST_CW_FINISHED_A:
 357                 case SSL3_ST_CW_FINISHED_B:
 358                         ret=ssl3_send_finished(s,
 359                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 360                                 &(ssl3_client_finished_const[0]));
 361                         if (ret <= 0) goto end;
 362                         s->state=SSL3_ST_CW_FLUSH;
 363
 364                         /* clear flags */
 365                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 366                         if (s->hit)
 367                                 {
 368                                 s->s3->tmp.next_state=SSL_ST_OK;
 369                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 370                                         {
 371                                         s->state=SSL_ST_OK;
 372                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 373                                         s->s3->delay_buf_pop_ret=0;
 374                                         }
 375                                 }
 376                         else
 377                                 {
 378                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 379                                 }
 380                         s->init_num=0;
 381                         break;
 382
 383                 case SSL3_ST_CR_FINISHED_A:
 384                 case SSL3_ST_CR_FINISHED_B:
 385
 386                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 387                                 SSL3_ST_CR_FINISHED_B,
 388                                 &(ssl3_server_finished_const[0]));
 389                         if (ret <= 0) goto end;
 390
 391                         if (s->hit)
 392                                 s->state=SSL3_ST_CW_CHANGE_A;
 393                         else
 394                                 s->state=SSL_ST_OK;
 395                         s->init_num=0;
 396                         break;
 397
 398                 case SSL3_ST_CW_FLUSH:
 399                         /* number of bytes to be flushed */
 400                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 401                         if (num1 > 0)
 402                                 {
 403                                 s->rwstate=SSL_WRITING;
 404                                 num1=BIO_flush(s->wbio);
 405                                 if (num1 <= 0) { ret= -1; goto end; }
 406                                 s->rwstate=SSL_NOTHING;
 407                                 }
 408
 409                         s->state=s->s3->tmp.next_state;
 410                         break;
 411
 412                 case SSL_ST_OK:
 413                         /* clean a few things up */
 414                         ssl3_cleanup_key_block(s);
 415
 416                         BUF_MEM_free(s->init_buf);
 417                         s->init_buf=NULL;
 418
 419                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 420                                 {
 421                                 /* remove buffering */
 422                                 under=BIO_pop(s->wbio);
 423                                 if (under != NULL)
 424                                         s->wbio=under;
 425                                 else
 426                                         abort(); /* ok */
 427
 428                                 BIO_free(s->bbio);
 429                                 s->bbio=NULL;
 430                                 }
 431                         /* else do it later */
 432
 433                         s->init_num=0;
 434                         s->new_session=0;
 435
 436                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 437
 438                         ret=1;
 439                         /* s->server=0; */
 440                         s->handshake_func=ssl3_connect;
 441                         s->ctx->sess_connect_good++;
 442
 443                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 444
 445                         goto end;
 446                         break;
 447
 448                 default:
 449                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 450                         ret= -1;
 451                         goto end;
 452                         /* break; */
 453                         }
 454
 455                 /* did we do anything */
 456                 if (!s->s3->tmp.reuse_message && !skip)
 457                         {
 458                         if (s->debug) BIO_flush(s->wbio);
 459
 460                         if ((cb != NULL) && (s->state != state))
 461                                 {
 462                                 new_state=s->state;
 463                                 s->state=state;
 464                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 465                                 s->state=new_state;
 466                                 }
 467                         }
 468                 skip=0;
 469                 }
 470 end:
 471         if (cb != NULL)
 472                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 473         s->in_handshake--;
 474         return(ret);
 475         }
 476
 477
 478 static int ssl3_client_hello(s)
 479 SSL *s;
 480         {
 481         unsigned char *buf;
 482         unsigned char *p,*d;
 483         int i;
 484         unsigned long Time,l;
 485
 486         buf=(unsigned char *)s->init_buf->data;
 487         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 488                 {
 489                 if ((s->session == NULL) ||
 490                         (s->session->ssl_version != s->version))
 491                         {
 492                         if (!ssl_get_new_session(s,0))
 493                                 goto err;
 494                         }
 495                 /* else use the pre-loaded session */
 496
 497                 p=s->s3->client_random;
 498                 Time=time(NULL);                        /* Time */
 499                 l2n(Time,p);
 500                 RAND_bytes(&(p[4]),SSL3_RANDOM_SIZE-sizeof(Time));
 501
 502                 /* Do the message type and length last */
 503                 d=p= &(buf[4]);
 504
 505                 *(p++)=SSL3_VERSION_MAJOR;
 506                 *(p++)=SSL3_VERSION_MINOR;
 507
 508                 /* Random stuff */
 509                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 510                 p+=SSL3_RANDOM_SIZE;
 511
 512                 /* Session ID */
 513                 if (s->new_session)
 514                         i=0;
 515                 else
 516                         i=s->session->session_id_length;
 517                 *(p++)=i;
 518                 if (i != 0)
 519                         {
 520                         memcpy(p,s->session->session_id,i);
 521                         p+=i;
 522                         }
 523
 524                 /* Ciphers supported */
 525                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 526                 if (i == 0)
 527                         {
 528                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 529                         goto err;
 530                         }
 531                 s2n(i,p);
 532                 p+=i;
 533
 534                 /* hardwire in the NULL compression algorithm. */
 535                 *(p++)=1;
 536                 *(p++)=0;
 537
 538                 l=(p-d);
 539                 d=buf;
 540                 *(d++)=SSL3_MT_CLIENT_HELLO;
 541                 l2n3(l,d);
 542
 543                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 544                 /* number of bytes to write */
 545                 s->init_num=p-buf;
 546                 s->init_off=0;
 547                 }
 548
 549         /* SSL3_ST_CW_CLNT_HELLO_B */
 550         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 551 err:
 552         return(-1);
 553         }
 554
 555 static int ssl3_get_server_hello(s)
 556 SSL *s;
 557         {
 558         STACK *sk;
 559         SSL_CIPHER *c;
 560         unsigned char *p,*d;
 561         int i,al,ok;
 562         unsigned int j;
 563         long n;
 564
 565         n=ssl3_get_message(s,
 566                 SSL3_ST_CR_SRVR_HELLO_A,
 567                 SSL3_ST_CR_SRVR_HELLO_B,
 568                 SSL3_MT_SERVER_HELLO,
 569                 300, /* ?? */
 570                 &ok);
 571
 572         if (!ok) return((int)n);
 573         d=p=(unsigned char *)s->init_buf->data;
 574
 575         if ((p[0] != SSL3_VERSION_MAJOR) && (p[1] != SSL3_VERSION_MINOR))
 576                 {
 577                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 578                 goto err;
 579                 }
 580         p+=2;
 581
 582         /* load the server hello data */
 583         /* load the server random */
 584         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 585         p+=SSL3_RANDOM_SIZE;
 586
 587         /* get the session-id */
 588         j= *(p++);
 589
 590         if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
 591                 {
 592                 /* SSLref returns 16 :-( */
 593                 if (j < SSL2_SSL_SESSION_ID_LENGTH)
 594                         {
 595                         al=SSL3_AD_ILLEGAL_PARAMETER;
 596                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
 597                         goto f_err;
 598                         }
 599                 }
 600         if (j == 0)
 601                 {
 602                 s->hit=0;
 603                 memset(s->session->session_id,0,SSL_MAX_SSL_SESSION_ID_LENGTH);
 604                 s->session->session_id_length=0;
 605                 }
 606         else if ((j == s->session->session_id_length) &&
 607                 (memcmp(p,s->session->session_id,j) == 0))
 608                 s->hit=1;
 609         else
 610                 {
 611                 memcpy(s->session->session_id,p,j);
 612                 s->session->session_id_length=j;
 613                 s->hit=0;
 614                 }
 615         p+=j;
 616         c=ssl_get_cipher_by_char(s,p);
 617         if (c == NULL)
 618                 {
 619                 /* unknown cipher */
 620                 al=SSL3_AD_HANDSHAKE_FAILURE;
 621                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 622                 goto f_err;
 623                 }
 624         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 625
 626         sk=ssl_get_ciphers_by_id(s);
 627         i=sk_find(sk,(char *)c);
 628         if (i < 0)
 629                 {
 630                 /* we did not say we would use this cipher */
 631                 al=SSL3_AD_ILLEGAL_PARAMETER;
 632                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 633                 goto f_err;
 634                 }
 635
 636         if (s->hit && (s->session->cipher != c))
 637                 {
 638                 if (!(s->ctx->options &
 639                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 640                         {
 641                         al=SSL3_AD_ILLEGAL_PARAMETER;
 642                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 643                         goto f_err;
 644                         }
 645                 }
 646         s->s3->tmp.new_cipher=c;
 647
 648         /* lets get the compression algorithm */
 649         j= *(p++);
 650         if (j != 0)
 651                 {
 652                 al=SSL3_AD_HANDSHAKE_FAILURE;
 653                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 654                 goto f_err;
 655                 }
 656
 657         if (p != (d+n))
 658                 {
 659                 /* wrong packet length */
 660                 al=SSL3_AD_ILLEGAL_PARAMETER;
 661                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 662                 goto err;
 663                 }
 664
 665         return(1);
 666 f_err:
 667         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 668 err:
 669         return(-1);
 670         }
 671
 672 static int ssl3_get_server_certificate(s)
 673 SSL *s;
 674         {
 675         int al,i,ok,ret= -1;
 676         unsigned long n,nc,llen,l;
 677         X509 *x=NULL;
 678         unsigned char *p,*d,*q;
 679         STACK *sk=NULL;
 680         CERT *c;
 681         EVP_PKEY *pkey=NULL;
 682
 683         n=ssl3_get_message(s,
 684                 SSL3_ST_CR_CERT_A,
 685                 SSL3_ST_CR_CERT_B,
 686                 -1,
 687 #if defined(MSDOS) && !defined(WIN32)
 688                 1024*30, /* 30k max cert list :-) */
 689 #else
 690                 1024*100, /* 100k max cert list :-) */
 691 #endif
 692                 &ok);
 693
 694         if (!ok) return((int)n);
 695
 696         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 697                 {
 698                 s->s3->tmp.reuse_message=1;
 699                 return(1);
 700                 }
 701
 702         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 703                 {
 704                 al=SSL3_AD_UNEXPECTED_MESSAGE;
 705                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 706                 goto f_err;
 707                 }
 708         d=p=(unsigned char *)s->init_buf->data;
 709
 710         if ((sk=sk_new_null()) == NULL)
 711                 {
 712                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 713                 goto err;
 714                 }
 715
 716         n2l3(p,llen);
 717         if (llen+3 != n)
 718                 {
 719                 al=SSL3_AD_ILLEGAL_PARAMETER;
 720                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 721                 goto f_err;
 722                 }
 723         for (nc=0; nc<llen; )
 724                 {
 725                 n2l3(p,l);
 726                 if ((l+nc+3) > llen)
 727                         {
 728                         al=SSL3_AD_ILLEGAL_PARAMETER;
 729                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 730                         goto f_err;
 731                         }
 732
 733                 q=p;
 734                 x=d2i_X509(NULL,&q,l);
 735                 if (x == NULL)
 736                         {
 737                         al=SSL3_AD_ILLEGAL_PARAMETER;
 738                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 739                         goto f_err;
 740                         }
 741                 if (q != (p+l))
 742                         {
 743                         al=SSL3_AD_ILLEGAL_PARAMETER;
 744                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 745                         goto f_err;
 746                         }
 747                 if (!sk_push(sk,(char *)x))
 748                         {
 749                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 750                         goto err;
 751                         }
 752                 x=NULL;
 753                 nc+=l+3;
 754                 p=q;
 755                 }
 756
 757         i=ssl_verify_cert_chain(s,sk);
 758         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 759                 {
 760                 al=ssl_verify_alarm_type(s->verify_result);
 761                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 762                 goto f_err;
 763                 }
 764
 765         c=ssl_cert_new();
 766         if (c == NULL) goto err;
 767
 768         if (s->session->cert) ssl_cert_free(s->session->cert);
 769         s->session->cert=c;
 770
 771         c->cert_chain=sk;
 772         x=(X509 *)sk_value(sk,0);
 773         sk=NULL;
 774
 775         pkey=X509_get_pubkey(x);
 776
 777         if (EVP_PKEY_missing_parameters(pkey))
 778                 {
 779                 x=NULL;
 780                 al=SSL3_AL_FATAL;
 781                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 782                 goto f_err;
 783                 }
 784
 785         i=ssl_cert_type(x,pkey);
 786         if (i < 0)
 787                 {
 788                 x=NULL;
 789                 al=SSL3_AL_FATAL;
 790                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 791                 goto f_err;
 792                 }
 793
 794         c->cert_type=i;
 795         x->references++;
 796         if (c->pkeys[i].x509 != NULL)
 797                 X509_free(c->pkeys[i].x509);
 798         c->pkeys[i].x509=x;
 799         c->key= &(c->pkeys[i]);
 800
 801         if ((s->session != NULL) && (s->session->peer != NULL))
 802                 X509_free(s->session->peer);
 803         x->references++;
 804         s->session->peer=x;
 805
 806         x=NULL;
 807         ret=1;
 808
 809         if (0)
 810                 {
 811 f_err:
 812                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 813                 }
 814 err:
 815         if (x != NULL) X509_free(x);
 816         if (sk != NULL) sk_pop_free(sk,X509_free);
 817         return(ret);
 818         }
 819
 820 static int ssl3_get_key_exchange(s)
 821 SSL *s;
 822         {
 823 #ifndef NO_RSA
 824         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 825 #endif
 826         EVP_MD_CTX md_ctx;
 827         unsigned char *param,*p;
 828         int al,i,j,param_len,ok;
 829         long n,alg;
 830         EVP_PKEY *pkey=NULL;
 831         RSA *rsa=NULL;
 832         DH *dh=NULL;
 833
 834         n=ssl3_get_message(s,
 835                 SSL3_ST_CR_KEY_EXCH_A,
 836                 SSL3_ST_CR_KEY_EXCH_B,
 837                 -1,
 838                 1024*8, /* ?? */
 839                 &ok);
 840
 841         if (!ok) return((int)n);
 842
 843         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 844                 {
 845                 s->s3->tmp.reuse_message=1;
 846                 return(1);
 847                 }
 848
 849         param=p=(unsigned char *)s->init_buf->data;
 850
 851         if (s->session->cert != NULL)
 852                 {
 853 #ifndef NO_RSA
 854                 if (s->session->cert->rsa_tmp != NULL)
 855                         {
 856                         RSA_free(s->session->cert->rsa_tmp);
 857                         s->session->cert->rsa_tmp=NULL;
 858                         }
 859 #endif
 860 #ifndef NO_DH
 861                 if (s->session->cert->dh_tmp)
 862                         {
 863                         DH_free(s->session->cert->dh_tmp);
 864                         s->session->cert->dh_tmp=NULL;
 865                         }
 866 #endif
 867                 }
 868         else
 869                 {
 870                 s->session->cert=ssl_cert_new();
 871                 }
 872
 873         param_len=0;
 874         alg=s->s3->tmp.new_cipher->algorithms;
 875
 876 #ifndef NO_RSA
 877         if (alg & SSL_kRSA)
 878                 {
 879                 if ((rsa=RSA_new()) == NULL)
 880                         {
 881                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 882                         goto err;
 883                         }
 884                 n2s(p,i);
 885                 param_len=i+2;
 886                 if (param_len > n)
 887                         {
 888                         al=SSL3_AD_ILLEGAL_PARAMETER;
 889                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
 890                         goto f_err;
 891                         }
 892                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
 893                         {
 894                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 895                         goto err;
 896                         }
 897                 p+=i;
 898
 899                 n2s(p,i);
 900                 param_len+=i+2;
 901                 if (param_len > n)
 902                         {
 903                         al=SSL3_AD_ILLEGAL_PARAMETER;
 904                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
 905                         goto f_err;
 906                         }
 907                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
 908                         {
 909                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 910                         goto err;
 911                         }
 912                 p+=i;
 913                 n-=param_len;
 914
 915 /*              s->session->cert->rsa_tmp=rsa;*/
 916                 /* this should be because we are using an export cipher */
 917                 if (alg & SSL_aRSA)
 918                         pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509);
 919                 else
 920                         {
 921                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
 922                         goto err;
 923                         }
 924                 s->session->cert->rsa_tmp=rsa;
 925                 }
 926         else
 927 #endif
 928 #ifndef NO_DH
 929                 if (alg & SSL_kEDH)
 930                 {
 931                 if ((dh=DH_new()) == NULL)
 932                         {
 933                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
 934                         goto err;
 935                         }
 936                 n2s(p,i);
 937                 param_len=i+2;
 938                 if (param_len > n)
 939                         {
 940                         al=SSL3_AD_ILLEGAL_PARAMETER;
 941                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
 942                         goto f_err;
 943                         }
 944                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
 945                         {
 946                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 947                         goto err;
 948                         }
 949                 p+=i;
 950
 951                 n2s(p,i);
 952                 param_len+=i+2;
 953                 if (param_len > n)
 954                         {
 955                         al=SSL3_AD_ILLEGAL_PARAMETER;
 956                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
 957                         goto f_err;
 958                         }
 959                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
 960                         {
 961                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 962                         goto err;
 963                         }
 964                 p+=i;
 965
 966                 n2s(p,i);
 967                 param_len+=i+2;
 968                 if (param_len > n)
 969                         {
 970                         al=SSL3_AD_ILLEGAL_PARAMETER;
 971                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
 972                         goto f_err;
 973                         }
 974                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
 975                         {
 976                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 977                         goto err;
 978                         }
 979                 p+=i;
 980                 n-=param_len;
 981
 982 #ifndef NO_RSA
 983                 if (alg & SSL_aRSA)
 984                         pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509);
 985                 else
 986 #endif
 987 #ifndef NO_DSA
 988                 if (alg & SSL_aDSS)
 989                         pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_DSA_SIGN].x509);
 990 #endif
 991                 /* else anonymous DH, so no certificate or pkey. */
 992
 993                 s->session->cert->dh_tmp=dh;
 994                 }
 995         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
 996                 {
 997                 al=SSL3_AD_HANDSHAKE_FAILURE;
 998                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
 999                 goto f_err;
1000                 }
1001 #endif
1002
1003         /* p points to the next byte, there are 'n' bytes left */
1004
1005
1006         /* if it was signed, check the signature */
1007         if (pkey != NULL)
1008                 {
1009                 n2s(p,i);
1010                 n-=2;
1011                 j=EVP_PKEY_size(pkey);
1012
1013                 if ((i != n) || (n > j) || (n <= 0))
1014                         {
1015                         /* wrong packet length */
1016                         al=SSL3_AD_ILLEGAL_PARAMETER;
1017                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1018                         goto err;
1019                         }
1020
1021 #ifndef NO_RSA
1022                 if (pkey->type == EVP_PKEY_RSA)
1023                         {
1024                         int num;
1025
1026                         j=0;
1027                         q=md_buf;
1028                         for (num=2; num > 0; num--)
1029                                 {
1030                                 EVP_DigestInit(&md_ctx,(num == 2)?EVP_md5():EVP_sha1());
1031                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1032                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1033                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1034                                 EVP_DigestFinal(&md_ctx,q,(unsigned int *)&i);
1035                                 q+=i;
1036                                 j+=i;
1037                                 }
1038                         i=RSA_public_decrypt((int)n,p,p,pkey->pkey.rsa,
1039                                 RSA_PKCS1_PADDING);
1040                         if (i <= 0)
1041                                 {
1042                                 al=SSL3_AD_ILLEGAL_PARAMETER;
1043                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1044                                 goto f_err;
1045                                 }
1046                         if ((j != i) || (memcmp(p,md_buf,i) != 0))
1047                                 {
1048                                 /* bad signature */
1049                                 al=SSL3_AD_ILLEGAL_PARAMETER;
1050                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1051                                 goto f_err;
1052                                 }
1053                         }
1054                 else
1055 #endif
1056 #ifndef NO_DSA
1057                         if (pkey->type == EVP_PKEY_DSA)
1058                         {
1059                         /* lets do DSS */
1060                         EVP_VerifyInit(&md_ctx,EVP_dss1());
1061                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1062                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1063                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1064                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1065                                 {
1066                                 /* bad signature */
1067                                 al=SSL3_AD_ILLEGAL_PARAMETER;
1068                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1069                                 goto f_err;
1070                                 }
1071                         }
1072                 else
1073 #endif
1074                         {
1075                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1076                         goto err;
1077                         }
1078                 }
1079         else
1080                 {
1081                 /* still data left over */
1082                 if (!(alg & SSL_aNULL))
1083                         {
1084                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1085                         goto err;
1086                         }
1087                 if (n != 0)
1088                         {
1089                         al=SSL3_AD_ILLEGAL_PARAMETER;
1090                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1091                         goto f_err;
1092                         }
1093                 }
1094
1095         return(1);
1096 f_err:
1097         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1098 err:
1099         return(-1);
1100         }
1101
1102 static int ssl3_get_certificate_request(s)
1103 SSL *s;
1104         {
1105         int ok,ret=0;
1106         unsigned long n,nc;
1107         unsigned int llen,l,ctype_num,i;
1108         X509_NAME *xn=NULL;
1109         unsigned char *p,*d,*q;
1110         STACK *ca_sk=NULL;
1111
1112         n=ssl3_get_message(s,
1113                 SSL3_ST_CR_CERT_REQ_A,
1114                 SSL3_ST_CR_CERT_REQ_B,
1115                 -1,
1116 #if defined(MSDOS) && !defined(WIN32)
1117                 1024*30,  /* 30k max cert list :-) */
1118 #else
1119                 1024*100, /* 100k max cert list :-) */
1120 #endif
1121                 &ok);
1122
1123         if (!ok) return((int)n);
1124
1125         s->s3->tmp.cert_req=0;
1126
1127         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1128                 {
1129                 s->s3->tmp.reuse_message=1;
1130                 return(1);
1131                 }
1132
1133         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1134                 {
1135                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL3_AD_UNEXPECTED_MESSAGE);
1136                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1137                 goto err;
1138                 }
1139
1140         d=p=(unsigned char *)s->init_buf->data;
1141
1142         if ((ca_sk=sk_new(ca_dn_cmp)) == NULL)
1143                 {
1144                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1145                 goto err;
1146                 }
1147
1148         /* get the certificate types */
1149         ctype_num= *(p++);
1150         if (ctype_num > SSL3_CT_NUMBER)
1151                 ctype_num=SSL3_CT_NUMBER;
1152         for (i=0; i<ctype_num; i++)
1153                 s->s3->tmp.ctype[i]= p[i];
1154         p+=ctype_num;
1155
1156         /* get the CA RDNs */
1157         n2s(p,llen);
1158         if ((llen+ctype_num+2+1) != n)
1159                 {
1160                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL3_AD_ILLEGAL_PARAMETER);
1161                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1162                 goto err;
1163                 }
1164
1165         for (nc=0; nc<llen; )
1166                 {
1167                 n2s(p,l);
1168                 if ((l+nc+2) > llen)
1169                         {
1170                         if ((s->ctx->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1171                                 goto cont; /* netscape bugs */
1172                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL3_AD_ILLEGAL_PARAMETER);
1173                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1174                         goto err;
1175                         }
1176
1177                 q=p;
1178
1179                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1180                         {
1181                         /* If netscape tollerance is on, ignore errors */
1182                         if (s->ctx->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1183                                 goto cont;
1184                         else
1185                                 {
1186                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL3_AD_ILLEGAL_PARAMETER);
1187                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1188                                 goto err;
1189                                 }
1190                         }
1191
1192                 if (q != (p+l))
1193                         {
1194                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL3_AD_ILLEGAL_PARAMETER);
1195                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1196                         goto err;
1197                         }
1198                 if (!sk_push(ca_sk,(char *)xn))
1199                         {
1200                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1201                         goto err;
1202                         }
1203
1204                 p+=l;
1205                 nc+=l+2;
1206                 }
1207
1208         if (0)
1209                 {
1210 cont:
1211                 ERR_clear_error();
1212                 }
1213
1214         /* we should setup a certficate to return.... */
1215         s->s3->tmp.cert_req=1;
1216         s->s3->tmp.ctype_num=ctype_num;
1217         if (s->s3->tmp.ca_names != NULL)
1218                 sk_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1219         s->s3->tmp.ca_names=ca_sk;
1220         ca_sk=NULL;
1221
1222         ret=1;
1223 err:
1224         if (ca_sk != NULL) sk_pop_free(ca_sk,X509_NAME_free);
1225         return(ret);
1226         }
1227
1228 static int ca_dn_cmp(a,b)
1229 X509_NAME **a,**b;
1230         {
1231         return(X509_NAME_cmp(*a,*b));
1232         }
1233
1234 static int ssl3_get_server_done(s)
1235 SSL *s;
1236         {
1237         int ok,ret=0;
1238         long n;
1239
1240         n=ssl3_get_message(s,
1241                 SSL3_ST_CR_SRVR_DONE_A,
1242                 SSL3_ST_CR_SRVR_DONE_B,
1243                 SSL3_MT_SERVER_DONE,
1244                 30, /* should be very small, like 0 :-) */
1245                 &ok);
1246
1247         if (!ok) return((int)n);
1248         if (n > 0)
1249                 {
1250                 /* should contain no data */
1251                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL3_AD_ILLEGAL_PARAMETER);
1252                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1253                 }
1254         ret=1;
1255         return(ret);
1256         }
1257
1258 static int ssl3_send_client_key_exchange(s)
1259 SSL *s;
1260         {
1261         unsigned char *p,*d;
1262         int n;
1263         unsigned long l;
1264         EVP_PKEY *pkey=NULL;
1265
1266         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1267                 {
1268                 d=(unsigned char *)s->init_buf->data;
1269                 p= &(d[4]);
1270
1271                 l=s->s3->tmp.new_cipher->algorithms;
1272
1273 #ifndef NO_RSA
1274                 if (l & SSL_kRSA)
1275                         {
1276                         RSA *rsa;
1277                         unsigned char tmp_buf[48];
1278
1279                         if (s->session->cert->rsa_tmp != NULL)
1280                                 rsa=s->session->cert->rsa_tmp;
1281                         else
1282                                 {
1283                                 pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509);
1284                                 if ((pkey == NULL) ||
1285                                         (pkey->type != EVP_PKEY_RSA) ||
1286                                         (pkey->pkey.rsa == NULL))
1287                                         {
1288                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1289                                         goto err;
1290                                         }
1291                                 rsa=pkey->pkey.rsa;
1292                                 }
1293
1294                         tmp_buf[0]=SSL3_VERSION_MAJOR;
1295                         tmp_buf[1]=SSL3_VERSION_MINOR;
1296                         RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1297
1298                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1299
1300                         n=RSA_public_encrypt(48,tmp_buf,p,rsa,
1301                                 RSA_PKCS1_PADDING);
1302                         if (n <= 0)
1303                                 {
1304                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1305                                 goto err;
1306                                 }
1307
1308                         s->session->master_key_length=
1309                                 ssl3_generate_master_secret(s,
1310                                         s->session->master_key,
1311                                         tmp_buf,48);
1312                         memset(tmp_buf,0,48);
1313                         }
1314                 else
1315 #endif
1316 #ifndef NO_DH
1317                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1318                         {
1319                         DH *dh_srvr,*dh_clnt;
1320
1321                         if (s->session->cert->dh_tmp != NULL)
1322                                 dh_srvr=s->session->cert->dh_tmp;
1323                         else
1324                                 {
1325                                 /* we get them from the cert */
1326                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL3_AD_HANDSHAKE_FAILURE);
1327                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1328                                 goto err;
1329                                 }
1330
1331                         /* generate a new random key */
1332                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1333                                 {
1334                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1335                                 goto err;
1336                                 }
1337                         if (!DH_generate_key(dh_clnt))
1338                                 {
1339                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1340                                 goto err;
1341                                 }
1342
1343                         /* use the 'p' output buffer for the DH key, but
1344                          * make sure to clear it out afterwards */
1345                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1346                         if (n <= 0)
1347                                 {
1348                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1349                                 goto err;
1350                                 }
1351
1352                         /* generate master key from the result */
1353                         s->session->master_key_length=
1354                                 ssl3_generate_master_secret(s,
1355                                         s->session->master_key,p,n);
1356                         /* clean up */
1357                         memset(p,0,n);
1358
1359                         /* send off the data */
1360                         n=BN_num_bytes(dh_clnt->pub_key);
1361                         s2n(n,p);
1362                         BN_bn2bin(dh_clnt->pub_key,p);
1363                         n+=2;
1364
1365                         DH_free(dh_clnt);
1366
1367                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1368                         }
1369                 else
1370 #endif
1371                         {
1372                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL3_AD_HANDSHAKE_FAILURE);
1373                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1374                         goto err;
1375                         }
1376
1377                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1378                 l2n3(n,d);
1379
1380                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1381                 /* number of bytes to write */
1382                 s->init_num=n+4;
1383                 s->init_off=0;
1384                 }
1385
1386         /* SSL3_ST_CW_KEY_EXCH_B */
1387         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1388 err:
1389         return(-1);
1390         }
1391
1392 static int ssl3_send_client_verify(s)
1393 SSL *s;
1394         {
1395         unsigned char *p,*d;
1396         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1397         EVP_PKEY *pkey;
1398         int i=0,j;
1399         unsigned long n;
1400
1401         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1402                 {
1403                 d=(unsigned char *)s->init_buf->data;
1404                 p= &(d[4]);
1405                 pkey=s->cert->key->privatekey;
1406
1407                 ssl3_final_finish_mac(s,&(s->s3->finish_dgst2),
1408                         NULL,&(data[MD5_DIGEST_LENGTH]));
1409
1410 #ifndef NO_RSA
1411                 if (pkey->type == EVP_PKEY_RSA)
1412                         {
1413                         ssl3_final_finish_mac(s,&(s->s3->finish_dgst1),
1414                                 NULL,&(data[0]));
1415                         i=RSA_private_encrypt(
1416                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1417                                 data,&(p[2]),pkey->pkey.rsa,
1418                                 RSA_PKCS1_PADDING);
1419                         if (i <= 0)
1420                                 {
1421                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1422                                 goto err;
1423                                 }
1424                         s2n(i,p);
1425                         n=i+2;
1426                         }
1427                 else
1428 #endif
1429 #ifndef NO_DSA
1430                         if (pkey->type == EVP_PKEY_DSA)
1431                         {
1432                         if (!DSA_sign(pkey->save_type,
1433                                 &(data[MD5_DIGEST_LENGTH]),
1434                                 SHA_DIGEST_LENGTH,&(p[2]),
1435                                 (unsigned int *)&j,pkey->pkey.dsa))
1436                                 {
1437                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1438                                 goto err;
1439                                 }
1440                         s2n(j,p);
1441                         n=j+2;
1442                         }
1443                 else
1444 #endif
1445                         {
1446                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,SSL_R_INTERNAL_ERROR);
1447                         goto err;
1448                         }
1449                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1450                 l2n3(n,d);
1451
1452                 s->init_num=(int)n+4;
1453                 s->init_off=0;
1454                 }
1455         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1456 err:
1457         return(-1);
1458         }
1459
1460 static int ssl3_send_client_certificate(s)
1461 SSL *s;
1462         {
1463         X509 *x509=NULL;
1464         EVP_PKEY *pkey=NULL;
1465         int i;
1466         unsigned long l;
1467
1468         if (s->state == SSL3_ST_CW_CERT_A)
1469                 {
1470                 if ((s->cert == NULL) ||
1471                         (s->cert->key->x509 == NULL) ||
1472                         (s->cert->key->privatekey == NULL))
1473                         s->state=SSL3_ST_CW_CERT_B;
1474                 else
1475                         s->state=SSL3_ST_CW_CERT_C;
1476                 }
1477
1478         /* We need to get a client cert */
1479         if (s->state == SSL3_ST_CW_CERT_B)
1480                 {
1481                 /* If we get an error, we need to
1482                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1483                  * We then get retied later */
1484                 i=0;
1485                 if (s->ctx->client_cert_cb != NULL)
1486                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1487                 if (i < 0)
1488                         {
1489                         s->rwstate=SSL_X509_LOOKUP;
1490                         return(-1);
1491                         }
1492                 s->rwstate=SSL_NOTHING;
1493                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1494                         {
1495                         s->state=SSL3_ST_CW_CERT_B;
1496                         if (    !SSL_use_certificate(s,x509) ||
1497                                 !SSL_use_PrivateKey(s,pkey))
1498                                 i=0;
1499                         }
1500                 else if (i == 1)
1501                         {
1502                         i=0;
1503                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1504                         }
1505
1506                 if (x509 != NULL) X509_free(x509);
1507                 if (pkey != NULL) EVP_PKEY_free(pkey);
1508                 if (i == 0)
1509                         {
1510                         s->s3->tmp.cert_req=0;
1511                         ssl3_send_alert(s,SSL3_AL_WARNING,SSL3_AD_NO_CERTIFICATE);
1512                         return(1);
1513                         }
1514
1515                 /* Ok, we have a cert */
1516                 s->state=SSL3_ST_CW_CERT_C;
1517                 }
1518
1519         if (s->state == SSL3_ST_CW_CERT_C)
1520                 {
1521                 s->state=SSL3_ST_CW_CERT_D;
1522                 l=ssl3_output_cert_chain(s,s->cert->key->x509);
1523                 s->init_num=(int)l;
1524                 s->init_off=0;
1525                 }
1526         /* SSL3_ST_CW_CERT_D */
1527         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1528         }
1529
1530 #define has_bits(i,m)   (((i)&(m)) == (m))
1531
1532 static int ssl3_check_cert_and_algorithm(s)
1533 SSL *s;
1534         {
1535         int i,idx;
1536         long algs;
1537         EVP_PKEY *pkey=NULL;
1538         CERT *c;
1539         RSA *rsa;
1540         DH *dh;
1541
1542         c=s->session->cert;
1543
1544         if (c == NULL)
1545                 {
1546                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_INTERNAL_ERROR);
1547                 goto err;
1548                 }
1549
1550         algs=s->s3->tmp.new_cipher->algorithms;
1551
1552         /* we don't have a certificate */
1553         if (algs & (SSL_aDH|SSL_aNULL))
1554                 return(1);
1555
1556         rsa=s->session->cert->rsa_tmp;
1557         dh=s->session->cert->dh_tmp;
1558
1559         /* This is the passed certificate */
1560
1561         idx=c->cert_type;
1562         pkey=X509_get_pubkey(c->pkeys[idx].x509);
1563         i=X509_certificate_type(c->pkeys[idx].x509,pkey);
1564
1565
1566         /* Check that we have a certificate if we require one */
1567         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1568                 {
1569                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1570                 goto f_err;
1571                 }
1572 #ifndef NO_DSA
1573         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1574                 {
1575                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1576                 goto f_err;
1577                 }
1578 #endif
1579
1580         if ((algs & SSL_kRSA) &&
1581                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1582                 {
1583                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1584                 goto f_err;
1585                 }
1586 #ifndef NO_DH
1587         else if ((algs & SSL_kEDH) &&
1588                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1589                 {
1590                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1591                 goto f_err;
1592                 }
1593         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1594                 {
1595                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1596                 goto f_err;
1597                 }
1598 #ifndef NO_DSA
1599         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1600                 {
1601                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1602                 goto f_err;
1603                 }
1604 #endif
1605 #endif
1606
1607         if ((algs & SSL_EXP) && !has_bits(i,EVP_PKT_EXP))
1608                 {
1609 #ifndef NO_RSA
1610                 if (algs & SSL_kRSA)
1611                         {
1612                         if ((rsa == NULL) || (RSA_size(rsa) > 512))
1613                                 {
1614                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1615                                 goto f_err;
1616                                 }
1617                         }
1618                 else
1619 #endif
1620 #ifndef NO_DH
1621                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1622                         {
1623                         if ((dh == NULL) || (DH_size(dh) > 512))
1624                                 {
1625                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1626                                 goto f_err;
1627                                 }
1628                         }
1629                 else
1630 #endif
1631                         {
1632                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1633                         goto f_err;
1634                         }
1635                 }
1636         return(1);
1637 f_err:
1638         ssl3_send_alert(s,SSL3_AL_FATAL,SSL3_AD_HANDSHAKE_FAILURE);
1639 err:
1640         return(0);
1641         }
1642