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