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                         {
 483                         if (!ssl_get_new_session(s,0))
 484                                 goto err;
 485                         }
 486                 /* else use the pre-loaded session */
 487
 488                 p=s->s3->client_random;
 489                 Time=time(NULL);                        /* Time */
 490                 l2n(Time,p);
 491                 RAND_bytes(&(p[4]),SSL3_RANDOM_SIZE-sizeof(Time));
 492
 493                 /* Do the message type and length last */
 494                 d=p= &(buf[4]);
 495
 496                 *(p++)=s->version>>8;
 497                 *(p++)=s->version&0xff;
 498
 499                 /* Random stuff */
 500                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 501                 p+=SSL3_RANDOM_SIZE;
 502
 503                 /* Session ID */
 504                 if (s->new_session)
 505                         i=0;
 506                 else
 507                         i=s->session->session_id_length;
 508                 *(p++)=i;
 509                 if (i != 0)
 510                         {
 511                         memcpy(p,s->session->session_id,i);
 512                         p+=i;
 513                         }
 514
 515                 /* Ciphers supported */
 516                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 517                 if (i == 0)
 518                         {
 519                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 520                         goto err;
 521                         }
 522                 s2n(i,p);
 523                 p+=i;
 524
 525                 /* hardwire in the NULL compression algorithm. */
 526                 *(p++)=1;
 527                 *(p++)=0;
 528
 529                 l=(p-d);
 530                 d=buf;
 531                 *(d++)=SSL3_MT_CLIENT_HELLO;
 532                 l2n3(l,d);
 533
 534                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 535                 /* number of bytes to write */
 536                 s->init_num=p-buf;
 537                 s->init_off=0;
 538                 }
 539
 540         /* SSL3_ST_CW_CLNT_HELLO_B */
 541         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 542 err:
 543         return(-1);
 544         }
 545
 546 static int ssl3_get_server_hello(s)
 547 SSL *s;
 548         {
 549         STACK *sk;
 550         SSL_CIPHER *c;
 551         unsigned char *p,*d;
 552         int i,al,ok;
 553         unsigned int j;
 554         long n;
 555
 556         n=ssl3_get_message(s,
 557                 SSL3_ST_CR_SRVR_HELLO_A,
 558                 SSL3_ST_CR_SRVR_HELLO_B,
 559                 SSL3_MT_SERVER_HELLO,
 560                 300, /* ?? */
 561                 &ok);
 562
 563         if (!ok) return((int)n);
 564         d=p=(unsigned char *)s->init_buf->data;
 565
 566         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 567                 {
 568                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 569                 s->version=(s->version&0xff00)|p[1];
 570                 al=SSL_AD_PROTOCOL_VERSION;
 571                 goto f_err;
 572                 }
 573         p+=2;
 574
 575         /* load the server hello data */
 576         /* load the server random */
 577         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 578         p+=SSL3_RANDOM_SIZE;
 579
 580         /* get the session-id */
 581         j= *(p++);
 582
 583         if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
 584                 {
 585                 /* SSLref returns 16 :-( */
 586                 if (j < SSL2_SSL_SESSION_ID_LENGTH)
 587                         {
 588                         al=SSL_AD_ILLEGAL_PARAMETER;
 589                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
 590                         goto f_err;
 591                         }
 592                 }
 593         if ((j != 0) && (j == s->session->session_id_length) &&
 594                 (memcmp(p,s->session->session_id,j) == 0))
 595                 s->hit=1;
 596         else    /* a miss or crap from the other end */
 597                 {
 598                 /* If we were trying for session-id reuse, make a new
 599                  * SSL_SESSION so we don't stuff up other people */
 600                 s->hit=0;
 601                 if (s->session->session_id_length > 0)
 602                         {
 603                         if (!ssl_get_new_session(s,0))
 604                                 {
 605                                 al=SSL_AD_INTERNAL_ERROR;
 606                                 goto f_err;
 607                                 }
 608                         }
 609                 s->session->session_id_length=j;
 610                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 611                 }
 612         p+=j;
 613         c=ssl_get_cipher_by_char(s,p);
 614         if (c == NULL)
 615                 {
 616                 /* unknown cipher */
 617                 al=SSL_AD_ILLEGAL_PARAMETER;
 618                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 619                 goto f_err;
 620                 }
 621         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 622
 623         sk=ssl_get_ciphers_by_id(s);
 624         i=sk_find(sk,(char *)c);
 625         if (i < 0)
 626                 {
 627                 /* we did not say we would use this cipher */
 628                 al=SSL_AD_ILLEGAL_PARAMETER;
 629                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 630                 goto f_err;
 631                 }
 632
 633         if (s->hit && (s->session->cipher != c))
 634                 {
 635                 if (!(s->options &
 636                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 637                         {
 638                         al=SSL_AD_ILLEGAL_PARAMETER;
 639                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 640                         goto f_err;
 641                         }
 642                 }
 643         s->s3->tmp.new_cipher=c;
 644
 645         /* lets get the compression algorithm */
 646         j= *(p++);
 647         if (j != 0)
 648                 {
 649                 al=SSL_AD_ILLEGAL_PARAMETER;
 650                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 651                 goto f_err;
 652                 }
 653
 654         if (p != (d+n))
 655                 {
 656                 /* wrong packet length */
 657                 al=SSL_AD_DECODE_ERROR;
 658                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 659                 goto err;
 660                 }
 661
 662         return(1);
 663 f_err:
 664         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 665 err:
 666         return(-1);
 667         }
 668
 669 static int ssl3_get_server_certificate(s)
 670 SSL *s;
 671         {
 672         int al,i,ok,ret= -1;
 673         unsigned long n,nc,llen,l;
 674         X509 *x=NULL;
 675         unsigned char *p,*d,*q;
 676         STACK *sk=NULL;
 677         CERT *c;
 678         EVP_PKEY *pkey=NULL;
 679
 680         n=ssl3_get_message(s,
 681                 SSL3_ST_CR_CERT_A,
 682                 SSL3_ST_CR_CERT_B,
 683                 -1,
 684 #if defined(MSDOS) && !defined(WIN32)
 685                 1024*30, /* 30k max cert list :-) */
 686 #else
 687                 1024*100, /* 100k max cert list :-) */
 688 #endif
 689                 &ok);
 690
 691         if (!ok) return((int)n);
 692
 693         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 694                 {
 695                 s->s3->tmp.reuse_message=1;
 696                 return(1);
 697                 }
 698
 699         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 700                 {
 701                 al=SSL_AD_UNEXPECTED_MESSAGE;
 702                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 703                 goto f_err;
 704                 }
 705         d=p=(unsigned char *)s->init_buf->data;
 706
 707         if ((sk=sk_new_null()) == NULL)
 708                 {
 709                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 710                 goto err;
 711                 }
 712
 713         n2l3(p,llen);
 714         if (llen+3 != n)
 715                 {
 716                 al=SSL_AD_DECODE_ERROR;
 717                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 718                 goto f_err;
 719                 }
 720         for (nc=0; nc<llen; )
 721                 {
 722                 n2l3(p,l);
 723                 if ((l+nc+3) > llen)
 724                         {
 725                         al=SSL_AD_DECODE_ERROR;
 726                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 727                         goto f_err;
 728                         }
 729
 730                 q=p;
 731                 x=d2i_X509(NULL,&q,l);
 732                 if (x == NULL)
 733                         {
 734                         al=SSL_AD_BAD_CERTIFICATE;
 735                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 736                         goto f_err;
 737                         }
 738                 if (q != (p+l))
 739                         {
 740                         al=SSL_AD_DECODE_ERROR;
 741                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 742                         goto f_err;
 743                         }
 744                 if (!sk_push(sk,(char *)x))
 745                         {
 746                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 747                         goto err;
 748                         }
 749                 x=NULL;
 750                 nc+=l+3;
 751                 p=q;
 752                 }
 753
 754         i=ssl_verify_cert_chain(s,sk);
 755         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 756                 {
 757                 al=ssl_verify_alarm_type(s->verify_result);
 758                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 759                 goto f_err;
 760                 }
 761
 762         c=ssl_cert_new();
 763         if (c == NULL) goto err;
 764
 765         if (s->session->cert) ssl_cert_free(s->session->cert);
 766         s->session->cert=c;
 767
 768         c->cert_chain=sk;
 769         x=(X509 *)sk_value(sk,0);
 770         sk=NULL;
 771
 772         pkey=X509_get_pubkey(x);
 773
 774         if (EVP_PKEY_missing_parameters(pkey))
 775                 {
 776                 x=NULL;
 777                 al=SSL3_AL_FATAL;
 778                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 779                 goto f_err;
 780                 }
 781
 782         i=ssl_cert_type(x,pkey);
 783         if (i < 0)
 784                 {
 785                 x=NULL;
 786                 al=SSL3_AL_FATAL;
 787                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 788                 goto f_err;
 789                 }
 790
 791         c->cert_type=i;
 792         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 793         if (c->pkeys[i].x509 != NULL)
 794                 X509_free(c->pkeys[i].x509);
 795         c->pkeys[i].x509=x;
 796         c->key= &(c->pkeys[i]);
 797
 798         if ((s->session != NULL) && (s->session->peer != NULL))
 799                 X509_free(s->session->peer);
 800         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 801         s->session->peer=x;
 802
 803         x=NULL;
 804         ret=1;
 805
 806         if (0)
 807                 {
 808 f_err:
 809                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 810                 }
 811 err:
 812         if (x != NULL) X509_free(x);
 813         if (sk != NULL) sk_pop_free(sk,X509_free);
 814         return(ret);
 815         }
 816
 817 static int ssl3_get_key_exchange(s)
 818 SSL *s;
 819         {
 820 #ifndef NO_RSA
 821         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 822 #endif
 823         EVP_MD_CTX md_ctx;
 824         unsigned char *param,*p;
 825         int al,i,j,param_len,ok;
 826         long n,alg;
 827         EVP_PKEY *pkey=NULL;
 828         RSA *rsa=NULL;
 829 #ifndef NO_DH
 830         DH *dh=NULL;
 831 #endif
 832
 833         n=ssl3_get_message(s,
 834                 SSL3_ST_CR_KEY_EXCH_A,
 835                 SSL3_ST_CR_KEY_EXCH_B,
 836                 -1,
 837                 1024*8, /* ?? */
 838                 &ok);
 839
 840         if (!ok) return((int)n);
 841
 842         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 843                 {
 844                 s->s3->tmp.reuse_message=1;
 845                 return(1);
 846                 }
 847
 848         param=p=(unsigned char *)s->init_buf->data;
 849
 850         if (s->session->cert != NULL)
 851                 {
 852 #ifndef NO_RSA
 853                 if (s->session->cert->rsa_tmp != NULL)
 854                         {
 855                         RSA_free(s->session->cert->rsa_tmp);
 856                         s->session->cert->rsa_tmp=NULL;
 857                         }
 858 #endif
 859 #ifndef NO_DH
 860                 if (s->session->cert->dh_tmp)
 861                         {
 862                         DH_free(s->session->cert->dh_tmp);
 863                         s->session->cert->dh_tmp=NULL;
 864                         }
 865 #endif
 866                 }
 867         else
 868                 {
 869                 s->session->cert=ssl_cert_new();
 870                 }
 871
 872         param_len=0;
 873         alg=s->s3->tmp.new_cipher->algorithms;
 874
 875 #ifndef NO_RSA
 876         if (alg & SSL_kRSA)
 877                 {
 878                 if ((rsa=RSA_new()) == NULL)
 879                         {
 880                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 881                         goto err;
 882                         }
 883                 n2s(p,i);
 884                 param_len=i+2;
 885                 if (param_len > n)
 886                         {
 887                         al=SSL_AD_DECODE_ERROR;
 888                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
 889                         goto f_err;
 890                         }
 891                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
 892                         {
 893                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 894                         goto err;
 895                         }
 896                 p+=i;
 897
 898                 n2s(p,i);
 899                 param_len+=i+2;
 900                 if (param_len > n)
 901                         {
 902                         al=SSL_AD_DECODE_ERROR;
 903                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
 904                         goto f_err;
 905                         }
 906                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
 907                         {
 908                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 909                         goto err;
 910                         }
 911                 p+=i;
 912                 n-=param_len;
 913
 914 /*              s->session->cert->rsa_tmp=rsa;*/
 915                 /* this should be because we are using an export cipher */
 916                 if (alg & SSL_aRSA)
 917                         pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509);
 918                 else
 919                         {
 920                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
 921                         goto err;
 922                         }
 923                 s->session->cert->rsa_tmp=rsa;
 924                 }
 925         else
 926 #endif
 927 #ifndef NO_DH
 928                 if (alg & SSL_kEDH)
 929                 {
 930                 if ((dh=DH_new()) == NULL)
 931                         {
 932                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
 933                         goto err;
 934                         }
 935                 n2s(p,i);
 936                 param_len=i+2;
 937                 if (param_len > n)
 938                         {
 939                         al=SSL_AD_DECODE_ERROR;
 940                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
 941                         goto f_err;
 942                         }
 943                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
 944                         {
 945                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 946                         goto err;
 947                         }
 948                 p+=i;
 949
 950                 n2s(p,i);
 951                 param_len+=i+2;
 952                 if (param_len > n)
 953                         {
 954                         al=SSL_AD_DECODE_ERROR;
 955                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
 956                         goto f_err;
 957                         }
 958                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
 959                         {
 960                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 961                         goto err;
 962                         }
 963                 p+=i;
 964
 965                 n2s(p,i);
 966                 param_len+=i+2;
 967                 if (param_len > n)
 968                         {
 969                         al=SSL_AD_DECODE_ERROR;
 970                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
 971                         goto f_err;
 972                         }
 973                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
 974                         {
 975                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 976                         goto err;
 977                         }
 978                 p+=i;
 979                 n-=param_len;
 980
 981 #ifndef NO_RSA
 982                 if (alg & SSL_aRSA)
 983                         pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509);
 984                 else
 985 #endif
 986 #ifndef NO_DSA
 987                 if (alg & SSL_aDSS)
 988                         pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_DSA_SIGN].x509);
 989 #endif
 990                 /* else anonymous DH, so no certificate or pkey. */
 991
 992                 s->session->cert->dh_tmp=dh;
 993                 }
 994         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
 995                 {
 996                 al=SSL_AD_ILLEGAL_PARAMETER;
 997                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
 998                 goto f_err;
 999                 }
1000 #endif
1001
1002         /* p points to the next byte, there are 'n' bytes left */
1003
1004
1005         /* if it was signed, check the signature */
1006         if (pkey != NULL)
1007                 {
1008                 n2s(p,i);
1009                 n-=2;
1010                 j=EVP_PKEY_size(pkey);
1011
1012                 if ((i != n) || (n > j) || (n <= 0))
1013                         {
1014                         /* wrong packet length */
1015                         al=SSL_AD_DECODE_ERROR;
1016                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1017                         goto err;
1018                         }
1019
1020 #ifndef NO_RSA
1021                 if (pkey->type == EVP_PKEY_RSA)
1022                         {
1023                         int num;
1024
1025                         j=0;
1026                         q=md_buf;
1027                         for (num=2; num > 0; num--)
1028                                 {
1029                                 EVP_DigestInit(&md_ctx,(num == 2)
1030                                         ?s->ctx->md5:s->ctx->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=SSL_AD_DECRYPT_ERROR;
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=SSL_AD_DECRYPT_ERROR;
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=SSL_AD_DECRYPT_ERROR;
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=SSL_AD_DECODE_ERROR;
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,l;
1107         unsigned int llen,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,SSL_AD_UNEXPECTED_MESSAGE);
1136                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1137                 goto err;
1138                 }
1139
1140         /* TLS does not like anon-DH with client cert */
1141         if (s->version > SSL3_VERSION)
1142                 {
1143                 l=s->s3->tmp.new_cipher->algorithms;
1144                 if (l & SSL_aNULL)
1145                         {
1146                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1147                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1148                         goto err;
1149                         }
1150                 }
1151
1152         d=p=(unsigned char *)s->init_buf->data;
1153
1154         if ((ca_sk=sk_new(ca_dn_cmp)) == NULL)
1155                 {
1156                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1157                 goto err;
1158                 }
1159
1160         /* get the certificate types */
1161         ctype_num= *(p++);
1162         if (ctype_num > SSL3_CT_NUMBER)
1163                 ctype_num=SSL3_CT_NUMBER;
1164         for (i=0; i<ctype_num; i++)
1165                 s->s3->tmp.ctype[i]= p[i];
1166         p+=ctype_num;
1167
1168         /* get the CA RDNs */
1169         n2s(p,llen);
1170         if ((llen+ctype_num+2+1) != n)
1171                 {
1172                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1173                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1174                 goto err;
1175                 }
1176
1177         for (nc=0; nc<llen; )
1178                 {
1179                 n2s(p,l);
1180                 if ((l+nc+2) > llen)
1181                         {
1182                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1183                                 goto cont; /* netscape bugs */
1184                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1185                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1186                         goto err;
1187                         }
1188
1189                 q=p;
1190
1191                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1192                         {
1193                         /* If netscape tollerance is on, ignore errors */
1194                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1195                                 goto cont;
1196                         else
1197                                 {
1198                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1199                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1200                                 goto err;
1201                                 }
1202                         }
1203
1204                 if (q != (p+l))
1205                         {
1206                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1207                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1208                         goto err;
1209                         }
1210                 if (!sk_push(ca_sk,(char *)xn))
1211                         {
1212                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1213                         goto err;
1214                         }
1215
1216                 p+=l;
1217                 nc+=l+2;
1218                 }
1219
1220         if (0)
1221                 {
1222 cont:
1223                 ERR_clear_error();
1224                 }
1225
1226         /* we should setup a certficate to return.... */
1227         s->s3->tmp.cert_req=1;
1228         s->s3->tmp.ctype_num=ctype_num;
1229         if (s->s3->tmp.ca_names != NULL)
1230                 sk_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1231         s->s3->tmp.ca_names=ca_sk;
1232         ca_sk=NULL;
1233
1234         ret=1;
1235 err:
1236         if (ca_sk != NULL) sk_pop_free(ca_sk,X509_NAME_free);
1237         return(ret);
1238         }
1239
1240 static int ca_dn_cmp(a,b)
1241 X509_NAME **a,**b;
1242         {
1243         return(X509_NAME_cmp(*a,*b));
1244         }
1245
1246 static int ssl3_get_server_done(s)
1247 SSL *s;
1248         {
1249         int ok,ret=0;
1250         long n;
1251
1252         n=ssl3_get_message(s,
1253                 SSL3_ST_CR_SRVR_DONE_A,
1254                 SSL3_ST_CR_SRVR_DONE_B,
1255                 SSL3_MT_SERVER_DONE,
1256                 30, /* should be very small, like 0 :-) */
1257                 &ok);
1258
1259         if (!ok) return((int)n);
1260         if (n > 0)
1261                 {
1262                 /* should contain no data */
1263                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1264                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1265                 }
1266         ret=1;
1267         return(ret);
1268         }
1269
1270 static int ssl3_send_client_key_exchange(s)
1271 SSL *s;
1272         {
1273         unsigned char *p,*q,*d;
1274         int n;
1275         unsigned long l;
1276         EVP_PKEY *pkey=NULL;
1277
1278         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1279                 {
1280                 d=(unsigned char *)s->init_buf->data;
1281                 p= &(d[4]);
1282
1283                 l=s->s3->tmp.new_cipher->algorithms;
1284
1285 #ifndef NO_RSA
1286                 if (l & SSL_kRSA)
1287                         {
1288                         RSA *rsa;
1289                         unsigned char tmp_buf[48];
1290
1291                         if (s->session->cert->rsa_tmp != NULL)
1292                                 rsa=s->session->cert->rsa_tmp;
1293                         else
1294                                 {
1295                                 pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509);
1296                                 if ((pkey == NULL) ||
1297                                         (pkey->type != EVP_PKEY_RSA) ||
1298                                         (pkey->pkey.rsa == NULL))
1299                                         {
1300                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1301                                         goto err;
1302                                         }
1303                                 rsa=pkey->pkey.rsa;
1304                                 }
1305
1306                         tmp_buf[0]=s->version>>8;
1307                         tmp_buf[1]=s->version&0xff;
1308                         RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1309
1310                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1311
1312                         q=p;
1313                         /* Fix buf for TLS and beyond */
1314                         if (s->version > SSL3_VERSION)
1315                                 p+=2;
1316                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1317                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1318                         if (n <= 0)
1319                                 {
1320                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1321                                 goto err;
1322                                 }
1323
1324                         /* Fix buf for TLS and beyond */
1325                         if (s->version > SSL3_VERSION)
1326                                 {
1327                                 s2n(n,q);
1328                                 n+=2;
1329                                 }
1330
1331                         s->session->master_key_length=
1332                                 s->method->ssl3_enc->generate_master_secret(s,
1333                                         s->session->master_key,
1334                                         tmp_buf,48);
1335                         memset(tmp_buf,0,48);
1336                         }
1337                 else
1338 #endif
1339 #ifndef NO_DH
1340                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1341                         {
1342                         DH *dh_srvr,*dh_clnt;
1343
1344                         if (s->session->cert->dh_tmp != NULL)
1345                                 dh_srvr=s->session->cert->dh_tmp;
1346                         else
1347                                 {
1348                                 /* we get them from the cert */
1349                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1350                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1351                                 goto err;
1352                                 }
1353
1354                         /* generate a new random key */
1355                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1356                                 {
1357                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1358                                 goto err;
1359                                 }
1360                         if (!DH_generate_key(dh_clnt))
1361                                 {
1362                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1363                                 goto err;
1364                                 }
1365
1366                         /* use the 'p' output buffer for the DH key, but
1367                          * make sure to clear it out afterwards */
1368
1369                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1370
1371                         if (n <= 0)
1372                                 {
1373                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1374                                 goto err;
1375                                 }
1376
1377                         /* generate master key from the result */
1378                         s->session->master_key_length=
1379                                 s->method->ssl3_enc->generate_master_secret(s,
1380                                         s->session->master_key,p,n);
1381                         /* clean up */
1382                         memset(p,0,n);
1383
1384                         /* send off the data */
1385                         n=BN_num_bytes(dh_clnt->pub_key);
1386                         s2n(n,p);
1387                         BN_bn2bin(dh_clnt->pub_key,p);
1388                         n+=2;
1389
1390                         DH_free(dh_clnt);
1391
1392                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1393                         }
1394                 else
1395 #endif
1396                         {
1397                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1398                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1399                         goto err;
1400                         }
1401
1402                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1403                 l2n3(n,d);
1404
1405                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1406                 /* number of bytes to write */
1407                 s->init_num=n+4;
1408                 s->init_off=0;
1409                 }
1410
1411         /* SSL3_ST_CW_KEY_EXCH_B */
1412         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1413 err:
1414         return(-1);
1415         }
1416
1417 static int ssl3_send_client_verify(s)
1418 SSL *s;
1419         {
1420         unsigned char *p,*d;
1421         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1422         EVP_PKEY *pkey;
1423         int i=0;
1424         unsigned long n;
1425 #ifndef NO_DSA
1426         int j;
1427 #endif
1428
1429         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1430                 {
1431                 d=(unsigned char *)s->init_buf->data;
1432                 p= &(d[4]);
1433                 pkey=s->cert->key->privatekey;
1434
1435                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1436                         &(data[MD5_DIGEST_LENGTH]));
1437
1438 #ifndef NO_RSA
1439                 if (pkey->type == EVP_PKEY_RSA)
1440                         {
1441                         s->method->ssl3_enc->cert_verify_mac(s,
1442                                 &(s->s3->finish_dgst1),&(data[0]));
1443                         i=RSA_private_encrypt(
1444                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1445                                 data,&(p[2]),pkey->pkey.rsa,
1446                                 RSA_PKCS1_PADDING);
1447                         if (i <= 0)
1448                                 {
1449                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1450                                 goto err;
1451                                 }
1452                         s2n(i,p);
1453                         n=i+2;
1454                         }
1455                 else
1456 #endif
1457 #ifndef NO_DSA
1458                         if (pkey->type == EVP_PKEY_DSA)
1459                         {
1460                         if (!DSA_sign(pkey->save_type,
1461                                 &(data[MD5_DIGEST_LENGTH]),
1462                                 SHA_DIGEST_LENGTH,&(p[2]),
1463                                 (unsigned int *)&j,pkey->pkey.dsa))
1464                                 {
1465                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1466                                 goto err;
1467                                 }
1468                         s2n(j,p);
1469                         n=j+2;
1470                         }
1471                 else
1472 #endif
1473                         {
1474                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,SSL_R_INTERNAL_ERROR);
1475                         goto err;
1476                         }
1477                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1478                 l2n3(n,d);
1479
1480                 s->init_num=(int)n+4;
1481                 s->init_off=0;
1482                 }
1483         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1484 err:
1485         return(-1);
1486         }
1487
1488 static int ssl3_send_client_certificate(s)
1489 SSL *s;
1490         {
1491         X509 *x509=NULL;
1492         EVP_PKEY *pkey=NULL;
1493         int i;
1494         unsigned long l;
1495
1496         if (s->state == SSL3_ST_CW_CERT_A)
1497                 {
1498                 if ((s->cert == NULL) ||
1499                         (s->cert->key->x509 == NULL) ||
1500                         (s->cert->key->privatekey == NULL))
1501                         s->state=SSL3_ST_CW_CERT_B;
1502                 else
1503                         s->state=SSL3_ST_CW_CERT_C;
1504                 }
1505
1506         /* We need to get a client cert */
1507         if (s->state == SSL3_ST_CW_CERT_B)
1508                 {
1509                 /* If we get an error, we need to
1510                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1511                  * We then get retied later */
1512                 i=0;
1513                 if (s->ctx->client_cert_cb != NULL)
1514                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1515                 if (i < 0)
1516                         {
1517                         s->rwstate=SSL_X509_LOOKUP;
1518                         return(-1);
1519                         }
1520                 s->rwstate=SSL_NOTHING;
1521                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1522                         {
1523                         s->state=SSL3_ST_CW_CERT_B;
1524                         if (    !SSL_use_certificate(s,x509) ||
1525                                 !SSL_use_PrivateKey(s,pkey))
1526                                 i=0;
1527                         }
1528                 else if (i == 1)
1529                         {
1530                         i=0;
1531                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1532                         }
1533
1534                 if (x509 != NULL) X509_free(x509);
1535                 if (pkey != NULL) EVP_PKEY_free(pkey);
1536                 if (i == 0)
1537                         {
1538                         if (s->version == SSL3_VERSION)
1539                                 {
1540                                 s->s3->tmp.cert_req=0;
1541                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1542                                 return(1);
1543                                 }
1544                         else
1545                                 {
1546                                 s->s3->tmp.cert_req=2;
1547                                 }
1548                         }
1549
1550                 /* Ok, we have a cert */
1551                 s->state=SSL3_ST_CW_CERT_C;
1552                 }
1553
1554         if (s->state == SSL3_ST_CW_CERT_C)
1555                 {
1556                 s->state=SSL3_ST_CW_CERT_D;
1557                 l=ssl3_output_cert_chain(s,
1558                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1559                 s->init_num=(int)l;
1560                 s->init_off=0;
1561                 }
1562         /* SSL3_ST_CW_CERT_D */
1563         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1564         }
1565
1566 #define has_bits(i,m)   (((i)&(m)) == (m))
1567
1568 static int ssl3_check_cert_and_algorithm(s)
1569 SSL *s;
1570         {
1571         int i,idx;
1572         long algs;
1573         EVP_PKEY *pkey=NULL;
1574         CERT *c;
1575         RSA *rsa;
1576         DH *dh;
1577
1578         c=s->session->cert;
1579
1580         if (c == NULL)
1581                 {
1582                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_INTERNAL_ERROR);
1583                 goto err;
1584                 }
1585
1586         algs=s->s3->tmp.new_cipher->algorithms;
1587
1588         /* we don't have a certificate */
1589         if (algs & (SSL_aDH|SSL_aNULL))
1590                 return(1);
1591
1592         rsa=s->session->cert->rsa_tmp;
1593         dh=s->session->cert->dh_tmp;
1594
1595         /* This is the passed certificate */
1596
1597         idx=c->cert_type;
1598         pkey=X509_get_pubkey(c->pkeys[idx].x509);
1599         i=X509_certificate_type(c->pkeys[idx].x509,pkey);
1600
1601
1602         /* Check that we have a certificate if we require one */
1603         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1604                 {
1605                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1606                 goto f_err;
1607                 }
1608 #ifndef NO_DSA
1609         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1610                 {
1611                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1612                 goto f_err;
1613                 }
1614 #endif
1615
1616         if ((algs & SSL_kRSA) &&
1617                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1618                 {
1619                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1620                 goto f_err;
1621                 }
1622 #ifndef NO_DH
1623         else if ((algs & SSL_kEDH) &&
1624                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1625                 {
1626                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1627                 goto f_err;
1628                 }
1629         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1630                 {
1631                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1632                 goto f_err;
1633                 }
1634 #ifndef NO_DSA
1635         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1636                 {
1637                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1638                 goto f_err;
1639                 }
1640 #endif
1641 #endif
1642
1643         if ((algs & SSL_EXP) && !has_bits(i,EVP_PKT_EXP))
1644                 {
1645 #ifndef NO_RSA
1646                 if (algs & SSL_kRSA)
1647                         {
1648                         if ((rsa == NULL) || (RSA_size(rsa) > 512))
1649                                 {
1650                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1651                                 goto f_err;
1652                                 }
1653                         }
1654                 else
1655 #endif
1656 #ifndef NO_DH
1657                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1658                         {
1659                         if ((dh == NULL) || (DH_size(dh) > 512))
1660                                 {
1661                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1662                                 goto f_err;
1663                                 }
1664                         }
1665                 else
1666 #endif
1667                         {
1668                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1669                         goto f_err;
1670                         }
1671                 }
1672         return(1);
1673 f_err:
1674         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1675 err:
1676         return(0);
1677         }
1678