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 <openssl/buffer.h>
  61 #include <openssl/rand.h>
  62 #include <openssl/objects.h>
  63 #include <openssl/md5.h>
  64 #include <openssl/sha.h>
  65 #include <openssl/evp.h>
  66 #include "ssl_locl.h"
  67
  68 static SSL_METHOD *ssl3_get_client_method(int ver);
  69 static int ssl3_client_hello(SSL *s);
  70 static int ssl3_get_server_hello(SSL *s);
  71 static int ssl3_get_certificate_request(SSL *s);
  72 static int ca_dn_cmp(X509_NAME **a,X509_NAME **b);
  73 static int ssl3_get_server_done(SSL *s);
  74 static int ssl3_send_client_verify(SSL *s);
  75 static int ssl3_send_client_certificate(SSL *s);
  76 static int ssl3_send_client_key_exchange(SSL *s);
  77 static int ssl3_get_key_exchange(SSL *s);
  78 static int ssl3_get_server_certificate(SSL *s);
  79 static int ssl3_check_cert_and_algorithm(SSL *s);
  80 static SSL_METHOD *ssl3_get_client_method(int ver)
  81         {
  82         if (ver == SSL3_VERSION)
  83                 return(SSLv3_client_method());
  84         else
  85                 return(NULL);
  86         }
  87
  88 SSL_METHOD *SSLv3_client_method(void)
  89         {
  90         static int init=1;
  91         static SSL_METHOD SSLv3_client_data;
  92
  93         if (init)
  94                 {
  95                 init=0;
  96                 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
  97                         sizeof(SSL_METHOD));
  98                 SSLv3_client_data.ssl_connect=ssl3_connect;
  99                 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
 100                 }
 101         return(&SSLv3_client_data);
 102         }
 103
 104 int ssl3_connect(SSL *s)
 105         {
 106         BUF_MEM *buf;
 107         unsigned long Time=time(NULL),l;
 108         long num1;
 109         void (*cb)()=NULL;
 110         int ret= -1;
 111         int new_state,state,skip=0;;
 112
 113         RAND_seed(&Time,sizeof(Time));
 114         ERR_clear_error();
 115         clear_sys_error();
 116
 117         if (s->info_callback != NULL)
 118                 cb=s->info_callback;
 119         else if (s->ctx->info_callback != NULL)
 120                 cb=s->ctx->info_callback;
 121
 122         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 123         s->in_handshake++;
 124
 125         for (;;)
 126                 {
 127                 state=s->state;
 128
 129                 switch(s->state)
 130                         {
 131                 case SSL_ST_RENEGOTIATE:
 132                         s->new_session=1;
 133                         s->state=SSL_ST_CONNECT;
 134                         s->ctx->stats.sess_connect_renegotiate++;
 135                         /* break */
 136                 case SSL_ST_BEFORE:
 137                 case SSL_ST_CONNECT:
 138                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 139                 case SSL_ST_OK|SSL_ST_CONNECT:
 140
 141                         s->server=0;
 142                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 143
 144                         if ((s->version & 0xff00 ) != 0x0300)
 145                                 abort();
 146                         /* s->version=SSL3_VERSION; */
 147                         s->type=SSL_ST_CONNECT;
 148
 149                         if (s->init_buf == NULL)
 150                                 {
 151                                 if ((buf=BUF_MEM_new()) == NULL)
 152                                         {
 153                                         ret= -1;
 154                                         goto end;
 155                                         }
 156                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 157                                         {
 158                                         ret= -1;
 159                                         goto end;
 160                                         }
 161                                 s->init_buf=buf;
 162                                 }
 163
 164                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 165
 166                         /* setup buffing BIO */
 167                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 168
 169                         /* don't push the buffering BIO quite yet */
 170
 171                         ssl3_init_finished_mac(s);
 172
 173                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 174                         s->ctx->stats.sess_connect++;
 175                         s->init_num=0;
 176                         break;
 177
 178                 case SSL3_ST_CW_CLNT_HELLO_A:
 179                 case SSL3_ST_CW_CLNT_HELLO_B:
 180
 181                         s->shutdown=0;
 182                         ret=ssl3_client_hello(s);
 183                         if (ret <= 0) goto end;
 184                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 185                         s->init_num=0;
 186
 187                         /* turn on buffering for the next lot of output */
 188                         if (s->bbio != s->wbio)
 189                                 s->wbio=BIO_push(s->bbio,s->wbio);
 190
 191                         break;
 192
 193                 case SSL3_ST_CR_SRVR_HELLO_A:
 194                 case SSL3_ST_CR_SRVR_HELLO_B:
 195                         ret=ssl3_get_server_hello(s);
 196                         if (ret <= 0) goto end;
 197                         if (s->hit)
 198                                 s->state=SSL3_ST_CR_FINISHED_A;
 199                         else
 200                                 s->state=SSL3_ST_CR_CERT_A;
 201                         s->init_num=0;
 202                         break;
 203
 204                 case SSL3_ST_CR_CERT_A:
 205                 case SSL3_ST_CR_CERT_B:
 206                         /* Check if it is anon DH */
 207                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 208                                 {
 209                                 ret=ssl3_get_server_certificate(s);
 210                                 if (ret <= 0) goto end;
 211                                 }
 212                         else
 213                                 skip=1;
 214                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 215                         s->init_num=0;
 216                         break;
 217
 218                 case SSL3_ST_CR_KEY_EXCH_A:
 219                 case SSL3_ST_CR_KEY_EXCH_B:
 220                         ret=ssl3_get_key_exchange(s);
 221                         if (ret <= 0) goto end;
 222                         s->state=SSL3_ST_CR_CERT_REQ_A;
 223                         s->init_num=0;
 224
 225                         /* at this point we check that we have the
 226                          * required stuff from the server */
 227                         if (!ssl3_check_cert_and_algorithm(s))
 228                                 {
 229                                 ret= -1;
 230                                 goto end;
 231                                 }
 232                         break;
 233
 234                 case SSL3_ST_CR_CERT_REQ_A:
 235                 case SSL3_ST_CR_CERT_REQ_B:
 236                         ret=ssl3_get_certificate_request(s);
 237                         if (ret <= 0) goto end;
 238                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 239                         s->init_num=0;
 240                         break;
 241
 242                 case SSL3_ST_CR_SRVR_DONE_A:
 243                 case SSL3_ST_CR_SRVR_DONE_B:
 244                         ret=ssl3_get_server_done(s);
 245                         if (ret <= 0) goto end;
 246                         if (s->s3->tmp.cert_req)
 247                                 s->state=SSL3_ST_CW_CERT_A;
 248                         else
 249                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 250                         s->init_num=0;
 251
 252                         break;
 253
 254                 case SSL3_ST_CW_CERT_A:
 255                 case SSL3_ST_CW_CERT_B:
 256                 case SSL3_ST_CW_CERT_C:
 257                 case SSL3_ST_CW_CERT_D:
 258                         ret=ssl3_send_client_certificate(s);
 259                         if (ret <= 0) goto end;
 260                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 261                         s->init_num=0;
 262                         break;
 263
 264                 case SSL3_ST_CW_KEY_EXCH_A:
 265                 case SSL3_ST_CW_KEY_EXCH_B:
 266                         ret=ssl3_send_client_key_exchange(s);
 267                         if (ret <= 0) goto end;
 268                         l=s->s3->tmp.new_cipher->algorithms;
 269                         /* EAY EAY EAY need to check for DH fix cert
 270                          * sent back */
 271                         /* For TLS, cert_req is set to 2, so a cert chain
 272                          * of nothing is sent, but no verify packet is sent */
 273                         if (s->s3->tmp.cert_req == 1)
 274                                 {
 275                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 276                                 }
 277                         else
 278                                 {
 279                                 s->state=SSL3_ST_CW_CHANGE_A;
 280                                 s->s3->change_cipher_spec=0;
 281                                 }
 282
 283                         s->init_num=0;
 284                         break;
 285
 286                 case SSL3_ST_CW_CERT_VRFY_A:
 287                 case SSL3_ST_CW_CERT_VRFY_B:
 288                         ret=ssl3_send_client_verify(s);
 289                         if (ret <= 0) goto end;
 290                         s->state=SSL3_ST_CW_CHANGE_A;
 291                         s->init_num=0;
 292                         s->s3->change_cipher_spec=0;
 293                         break;
 294
 295                 case SSL3_ST_CW_CHANGE_A:
 296                 case SSL3_ST_CW_CHANGE_B:
 297                         ret=ssl3_send_change_cipher_spec(s,
 298                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 299                         if (ret <= 0) goto end;
 300                         s->state=SSL3_ST_CW_FINISHED_A;
 301                         s->init_num=0;
 302
 303                         s->session->cipher=s->s3->tmp.new_cipher;
 304                         if (s->s3->tmp.new_compression == NULL)
 305                                 s->session->compress_meth=0;
 306                         else
 307                                 s->session->compress_meth=
 308                                         s->s3->tmp.new_compression->id;
 309                         if (!s->method->ssl3_enc->setup_key_block(s))
 310                                 {
 311                                 ret= -1;
 312                                 goto end;
 313                                 }
 314
 315                         if (!s->method->ssl3_enc->change_cipher_state(s,
 316                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 317                                 {
 318                                 ret= -1;
 319                                 goto end;
 320                                 }
 321
 322                         break;
 323
 324                 case SSL3_ST_CW_FINISHED_A:
 325                 case SSL3_ST_CW_FINISHED_B:
 326                         ret=ssl3_send_finished(s,
 327                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 328                                 s->method->ssl3_enc->client_finished,
 329                                 s->method->ssl3_enc->client_finished_len);
 330                         if (ret <= 0) goto end;
 331                         s->state=SSL3_ST_CW_FLUSH;
 332
 333                         /* clear flags */
 334                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 335                         if (s->hit)
 336                                 {
 337                                 s->s3->tmp.next_state=SSL_ST_OK;
 338                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 339                                         {
 340                                         s->state=SSL_ST_OK;
 341                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 342                                         s->s3->delay_buf_pop_ret=0;
 343                                         }
 344                                 }
 345                         else
 346                                 {
 347                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 348                                 }
 349                         s->init_num=0;
 350                         break;
 351
 352                 case SSL3_ST_CR_FINISHED_A:
 353                 case SSL3_ST_CR_FINISHED_B:
 354
 355                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 356                                 SSL3_ST_CR_FINISHED_B);
 357                         if (ret <= 0) goto end;
 358
 359                         if (s->hit)
 360                                 s->state=SSL3_ST_CW_CHANGE_A;
 361                         else
 362                                 s->state=SSL_ST_OK;
 363                         s->init_num=0;
 364                         break;
 365
 366                 case SSL3_ST_CW_FLUSH:
 367                         /* number of bytes to be flushed */
 368                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 369                         if (num1 > 0)
 370                                 {
 371                                 s->rwstate=SSL_WRITING;
 372                                 num1=BIO_flush(s->wbio);
 373                                 if (num1 <= 0) { ret= -1; goto end; }
 374                                 s->rwstate=SSL_NOTHING;
 375                                 }
 376
 377                         s->state=s->s3->tmp.next_state;
 378                         break;
 379
 380                 case SSL_ST_OK:
 381                         /* clean a few things up */
 382                         ssl3_cleanup_key_block(s);
 383
 384                         if (s->init_buf != NULL)
 385                                 {
 386                                 BUF_MEM_free(s->init_buf);
 387                                 s->init_buf=NULL;
 388                                 }
 389
 390                         /* If we are not 'joining' the last two packets,
 391                          * remove the buffering now */
 392                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 393                                 ssl_free_wbio_buffer(s);
 394                         /* else do it later in ssl3_write */
 395
 396                         s->init_num=0;
 397                         s->new_session=0;
 398
 399                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 400                         if (s->hit) s->ctx->stats.sess_hit++;
 401
 402                         ret=1;
 403                         /* s->server=0; */
 404                         s->handshake_func=ssl3_connect;
 405                         s->ctx->stats.sess_connect_good++;
 406
 407                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 408
 409                         goto end;
 410                         /* break; */
 411
 412                 default:
 413                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 414                         ret= -1;
 415                         goto end;
 416                         /* break; */
 417                         }
 418
 419                 /* did we do anything */
 420                 if (!s->s3->tmp.reuse_message && !skip)
 421                         {
 422                         if (s->debug)
 423                                 {
 424                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 425                                         goto end;
 426                                 }
 427
 428                         if ((cb != NULL) && (s->state != state))
 429                                 {
 430                                 new_state=s->state;
 431                                 s->state=state;
 432                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 433                                 s->state=new_state;
 434                                 }
 435                         }
 436                 skip=0;
 437                 }
 438 end:
 439         if (cb != NULL)
 440                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 441         s->in_handshake--;
 442         return(ret);
 443         }
 444
 445
 446 static int ssl3_client_hello(SSL *s)
 447         {
 448         unsigned char *buf;
 449         unsigned char *p,*d;
 450         int i,j;
 451         unsigned long Time,l;
 452         SSL_COMP *comp;
 453
 454         buf=(unsigned char *)s->init_buf->data;
 455         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 456                 {
 457                 if ((s->session == NULL) ||
 458                         (s->session->ssl_version != s->version) ||
 459                         (s->session->not_resumable))
 460                         {
 461                         if (!ssl_get_new_session(s,0))
 462                                 goto err;
 463                         }
 464                 /* else use the pre-loaded session */
 465
 466                 p=s->s3->client_random;
 467                 Time=time(NULL);                        /* Time */
 468                 l2n(Time,p);
 469                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 470
 471                 /* Do the message type and length last */
 472                 d=p= &(buf[4]);
 473
 474                 *(p++)=s->version>>8;
 475                 *(p++)=s->version&0xff;
 476                 s->client_version=s->version;
 477
 478                 /* Random stuff */
 479                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 480                 p+=SSL3_RANDOM_SIZE;
 481
 482                 /* Session ID */
 483                 if (s->new_session)
 484                         i=0;
 485                 else
 486                         i=s->session->session_id_length;
 487                 *(p++)=i;
 488                 if (i != 0)
 489                         {
 490                         memcpy(p,s->session->session_id,i);
 491                         p+=i;
 492                         }
 493
 494                 /* Ciphers supported */
 495                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 496                 if (i == 0)
 497                         {
 498                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 499                         goto err;
 500                         }
 501                 s2n(i,p);
 502                 p+=i;
 503
 504                 /* COMPRESSION */
 505                 if (s->ctx->comp_methods == NULL)
 506                         j=0;
 507                 else
 508                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 509                 *(p++)=1+j;
 510                 for (i=0; i<j; i++)
 511                         {
 512                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 513                         *(p++)=comp->id;
 514                         }
 515                 *(p++)=0; /* Add the NULL method */
 516
 517                 l=(p-d);
 518                 d=buf;
 519                 *(d++)=SSL3_MT_CLIENT_HELLO;
 520                 l2n3(l,d);
 521
 522                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 523                 /* number of bytes to write */
 524                 s->init_num=p-buf;
 525                 s->init_off=0;
 526                 }
 527
 528         /* SSL3_ST_CW_CLNT_HELLO_B */
 529         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 530 err:
 531         return(-1);
 532         }
 533
 534 static int ssl3_get_server_hello(SSL *s)
 535         {
 536         STACK_OF(SSL_CIPHER) *sk;
 537         SSL_CIPHER *c;
 538         unsigned char *p,*d;
 539         int i,al,ok;
 540         unsigned int j;
 541         long n;
 542         SSL_COMP *comp;
 543
 544         n=ssl3_get_message(s,
 545                 SSL3_ST_CR_SRVR_HELLO_A,
 546                 SSL3_ST_CR_SRVR_HELLO_B,
 547                 SSL3_MT_SERVER_HELLO,
 548                 300, /* ?? */
 549                 &ok);
 550
 551         if (!ok) return((int)n);
 552         d=p=(unsigned char *)s->init_buf->data;
 553
 554         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 555                 {
 556                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 557                 s->version=(s->version&0xff00)|p[1];
 558                 al=SSL_AD_PROTOCOL_VERSION;
 559                 goto f_err;
 560                 }
 561         p+=2;
 562
 563         /* load the server hello data */
 564         /* load the server random */
 565         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 566         p+=SSL3_RANDOM_SIZE;
 567
 568         /* get the session-id */
 569         j= *(p++);
 570
 571         if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
 572                 {
 573                 /* SSLref returns 16 :-( */
 574                 if (j < SSL2_SSL_SESSION_ID_LENGTH)
 575                         {
 576                         al=SSL_AD_ILLEGAL_PARAMETER;
 577                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
 578                         goto f_err;
 579                         }
 580                 }
 581         if (j != 0 && j == s->session->session_id_length
 582             && memcmp(p,s->session->session_id,j) == 0)
 583             {
 584             if(s->sid_ctx_length != s->session->sid_ctx_length
 585                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 586                 {
 587                 al=SSL_AD_ILLEGAL_PARAMETER;
 588                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 589                 goto f_err;
 590                 }
 591             s->hit=1;
 592             }
 593         else    /* a miss or crap from the other end */
 594                 {
 595                 /* If we were trying for session-id reuse, make a new
 596                  * SSL_SESSION so we don't stuff up other people */
 597                 s->hit=0;
 598                 if (s->session->session_id_length > 0)
 599                         {
 600                         if (!ssl_get_new_session(s,0))
 601                                 {
 602                                 al=SSL_AD_INTERNAL_ERROR;
 603                                 goto f_err;
 604                                 }
 605                         }
 606                 s->session->session_id_length=j;
 607                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 608                 }
 609         p+=j;
 610         c=ssl_get_cipher_by_char(s,p);
 611         if (c == NULL)
 612                 {
 613                 /* unknown cipher */
 614                 al=SSL_AD_ILLEGAL_PARAMETER;
 615                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 616                 goto f_err;
 617                 }
 618         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 619
 620         sk=ssl_get_ciphers_by_id(s);
 621         i=sk_SSL_CIPHER_find(sk,c);
 622         if (i < 0)
 623                 {
 624                 /* we did not say we would use this cipher */
 625                 al=SSL_AD_ILLEGAL_PARAMETER;
 626                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 627                 goto f_err;
 628                 }
 629
 630         if (s->hit && (s->session->cipher != c))
 631                 {
 632                 if (!(s->options &
 633                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 634                         {
 635                         al=SSL_AD_ILLEGAL_PARAMETER;
 636                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 637                         goto f_err;
 638                         }
 639                 }
 640         s->s3->tmp.new_cipher=c;
 641
 642         /* lets get the compression algorithm */
 643         /* COMPRESSION */
 644         j= *(p++);
 645         if (j == 0)
 646                 comp=NULL;
 647         else
 648                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 649
 650         if ((j != 0) && (comp == NULL))
 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         else
 657                 {
 658                 s->s3->tmp.new_compression=comp;
 659                 }
 660
 661         if (p != (d+n))
 662                 {
 663                 /* wrong packet length */
 664                 al=SSL_AD_DECODE_ERROR;
 665                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 666                 goto err;
 667                 }
 668
 669         return(1);
 670 f_err:
 671         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 672 err:
 673         return(-1);
 674         }
 675
 676 static int ssl3_get_server_certificate(SSL *s)
 677         {
 678         int al,i,ok,ret= -1;
 679         unsigned long n,nc,llen,l;
 680         X509 *x=NULL;
 681         unsigned char *p,*d,*q;
 682         STACK_OF(X509) *sk=NULL;
 683         SESS_CERT *sc;
 684         EVP_PKEY *pkey=NULL;
 685
 686         n=ssl3_get_message(s,
 687                 SSL3_ST_CR_CERT_A,
 688                 SSL3_ST_CR_CERT_B,
 689                 -1,
 690 #if defined(MSDOS) && !defined(WIN32)
 691                 1024*30, /* 30k max cert list :-) */
 692 #else
 693                 1024*100, /* 100k max cert list :-) */
 694 #endif
 695                 &ok);
 696
 697         if (!ok) return((int)n);
 698
 699         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 700                 {
 701                 s->s3->tmp.reuse_message=1;
 702                 return(1);
 703                 }
 704
 705         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 706                 {
 707                 al=SSL_AD_UNEXPECTED_MESSAGE;
 708                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 709                 goto f_err;
 710                 }
 711         d=p=(unsigned char *)s->init_buf->data;
 712
 713         if ((sk=sk_X509_new_null()) == NULL)
 714                 {
 715                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 716                 goto err;
 717                 }
 718
 719         n2l3(p,llen);
 720         if (llen+3 != n)
 721                 {
 722                 al=SSL_AD_DECODE_ERROR;
 723                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 724                 goto f_err;
 725                 }
 726         for (nc=0; nc<llen; )
 727                 {
 728                 n2l3(p,l);
 729                 if ((l+nc+3) > llen)
 730                         {
 731                         al=SSL_AD_DECODE_ERROR;
 732                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 733                         goto f_err;
 734                         }
 735
 736                 q=p;
 737                 x=d2i_X509(NULL,&q,l);
 738                 if (x == NULL)
 739                         {
 740                         al=SSL_AD_BAD_CERTIFICATE;
 741                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 742                         goto f_err;
 743                         }
 744                 if (q != (p+l))
 745                         {
 746                         al=SSL_AD_DECODE_ERROR;
 747                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 748                         goto f_err;
 749                         }
 750                 if (!sk_X509_push(sk,x))
 751                         {
 752                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 753                         goto err;
 754                         }
 755                 x=NULL;
 756                 nc+=l+3;
 757                 p=q;
 758                 }
 759
 760         i=ssl_verify_cert_chain(s,sk);
 761         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 762                 {
 763                 al=ssl_verify_alarm_type(s->verify_result);
 764                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 765                 goto f_err;
 766                 }
 767
 768         sc=ssl_sess_cert_new();
 769         if (sc == NULL) goto err;
 770
 771         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 772         s->session->sess_cert=sc;
 773
 774         sc->cert_chain=sk;
 775         x=sk_X509_value(sk,0);
 776         sk=NULL;
 777
 778         pkey=X509_get_pubkey(x);
 779
 780         if ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))
 781                 {
 782                 x=NULL;
 783                 al=SSL3_AL_FATAL;
 784                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 785                 goto f_err;
 786                 }
 787
 788         i=ssl_cert_type(x,pkey);
 789         if (i < 0)
 790                 {
 791                 x=NULL;
 792                 al=SSL3_AL_FATAL;
 793                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 794                 goto f_err;
 795                 }
 796
 797         sc->peer_cert_type=i;
 798         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 799         if (sc->peer_pkeys[i].x509 != NULL) /* Why would this ever happen?
 800                                                                                  * We just created sc a couple of
 801                                                                                  * lines ago. */
 802                 X509_free(sc->peer_pkeys[i].x509);
 803         sc->peer_pkeys[i].x509=x;
 804         sc->peer_key= &(sc->peer_pkeys[i]);
 805
 806         if (s->session->peer != NULL)
 807                 X509_free(s->session->peer);
 808         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 809         s->session->peer=x;
 810
 811         x=NULL;
 812         ret=1;
 813
 814         if (0)
 815                 {
 816 f_err:
 817                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 818                 }
 819 err:
 820         EVP_PKEY_free(pkey);
 821         X509_free(x);
 822         sk_X509_pop_free(sk,X509_free);
 823         return(ret);
 824         }
 825
 826 static int ssl3_get_key_exchange(SSL *s)
 827         {
 828 #ifndef NO_RSA
 829         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 830 #endif
 831         EVP_MD_CTX md_ctx;
 832         unsigned char *param,*p;
 833         int al,i,j,param_len,ok;
 834         long n,alg;
 835         EVP_PKEY *pkey=NULL;
 836 #ifndef NO_RSA
 837         RSA *rsa=NULL;
 838 #endif
 839 #ifndef NO_DH
 840         DH *dh=NULL;
 841 #endif
 842
 843         n=ssl3_get_message(s,
 844                 SSL3_ST_CR_KEY_EXCH_A,
 845                 SSL3_ST_CR_KEY_EXCH_B,
 846                 -1,
 847                 1024*8, /* ?? */
 848                 &ok);
 849
 850         if (!ok) return((int)n);
 851
 852         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 853                 {
 854                 s->s3->tmp.reuse_message=1;
 855                 return(1);
 856                 }
 857
 858         param=p=(unsigned char *)s->init_buf->data;
 859
 860         if (s->session->sess_cert != NULL)
 861                 {
 862 #ifndef NO_RSA
 863                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
 864                         {
 865                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
 866                         s->session->sess_cert->peer_rsa_tmp=NULL;
 867                         }
 868 #endif
 869 #ifndef NO_DH
 870                 if (s->session->sess_cert->peer_dh_tmp)
 871                         {
 872                         DH_free(s->session->sess_cert->peer_dh_tmp);
 873                         s->session->sess_cert->peer_dh_tmp=NULL;
 874                         }
 875 #endif
 876                 }
 877         else
 878                 {
 879                 s->session->sess_cert=ssl_sess_cert_new();
 880                 }
 881
 882         param_len=0;
 883         alg=s->s3->tmp.new_cipher->algorithms;
 884
 885 #ifndef NO_RSA
 886         if (alg & SSL_kRSA)
 887                 {
 888                 if ((rsa=RSA_new()) == NULL)
 889                         {
 890                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 891                         goto err;
 892                         }
 893                 n2s(p,i);
 894                 param_len=i+2;
 895                 if (param_len > n)
 896                         {
 897                         al=SSL_AD_DECODE_ERROR;
 898                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
 899                         goto f_err;
 900                         }
 901                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
 902                         {
 903                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 904                         goto err;
 905                         }
 906                 p+=i;
 907
 908                 n2s(p,i);
 909                 param_len+=i+2;
 910                 if (param_len > n)
 911                         {
 912                         al=SSL_AD_DECODE_ERROR;
 913                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
 914                         goto f_err;
 915                         }
 916                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
 917                         {
 918                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 919                         goto err;
 920                         }
 921                 p+=i;
 922                 n-=param_len;
 923
 924                 /* this should be because we are using an export cipher */
 925                 if (alg & SSL_aRSA)
 926                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 927                 else
 928                         {
 929                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
 930                         goto err;
 931                         }
 932                 s->session->sess_cert->peer_rsa_tmp=rsa;
 933                 }
 934         else
 935 #endif
 936 #ifndef NO_DH
 937                 if (alg & SSL_kEDH)
 938                 {
 939                 if ((dh=DH_new()) == NULL)
 940                         {
 941                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
 942                         goto err;
 943                         }
 944                 n2s(p,i);
 945                 param_len=i+2;
 946                 if (param_len > n)
 947                         {
 948                         al=SSL_AD_DECODE_ERROR;
 949                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
 950                         goto f_err;
 951                         }
 952                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
 953                         {
 954                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 955                         goto err;
 956                         }
 957                 p+=i;
 958
 959                 n2s(p,i);
 960                 param_len+=i+2;
 961                 if (param_len > n)
 962                         {
 963                         al=SSL_AD_DECODE_ERROR;
 964                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
 965                         goto f_err;
 966                         }
 967                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
 968                         {
 969                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 970                         goto err;
 971                         }
 972                 p+=i;
 973
 974                 n2s(p,i);
 975                 param_len+=i+2;
 976                 if (param_len > n)
 977                         {
 978                         al=SSL_AD_DECODE_ERROR;
 979                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
 980                         goto f_err;
 981                         }
 982                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
 983                         {
 984                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 985                         goto err;
 986                         }
 987                 p+=i;
 988                 n-=param_len;
 989
 990 #ifndef NO_RSA
 991                 if (alg & SSL_aRSA)
 992                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 993                 else
 994 #endif
 995 #ifndef NO_DSA
 996                 if (alg & SSL_aDSS)
 997                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
 998 #endif
 999                 /* else anonymous DH, so no certificate or pkey. */
1000
1001                 s->session->sess_cert->peer_dh_tmp=dh;
1002                 dh=NULL;
1003                 }
1004         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1005                 {
1006                 al=SSL_AD_ILLEGAL_PARAMETER;
1007                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1008                 goto f_err;
1009                 }
1010 #endif
1011         if (alg & SSL_aFZA)
1012                 {
1013                 al=SSL_AD_HANDSHAKE_FAILURE;
1014                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1015                 goto f_err;
1016                 }
1017
1018
1019         /* p points to the next byte, there are 'n' bytes left */
1020
1021
1022         /* if it was signed, check the signature */
1023         if (pkey != NULL)
1024                 {
1025                 n2s(p,i);
1026                 n-=2;
1027                 j=EVP_PKEY_size(pkey);
1028
1029                 if ((i != n) || (n > j) || (n <= 0))
1030                         {
1031                         /* wrong packet length */
1032                         al=SSL_AD_DECODE_ERROR;
1033                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1034                         goto f_err;
1035                         }
1036
1037 #ifndef NO_RSA
1038                 if (pkey->type == EVP_PKEY_RSA)
1039                         {
1040                         int num;
1041
1042                         j=0;
1043                         q=md_buf;
1044                         for (num=2; num > 0; num--)
1045                                 {
1046                                 EVP_DigestInit(&md_ctx,(num == 2)
1047                                         ?s->ctx->md5:s->ctx->sha1);
1048                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1049                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1050                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1051                                 EVP_DigestFinal(&md_ctx,q,(unsigned int *)&i);
1052                                 q+=i;
1053                                 j+=i;
1054                                 }
1055                         i=RSA_public_decrypt((int)n,p,p,pkey->pkey.rsa,
1056                                 RSA_PKCS1_PADDING);
1057                         if (i <= 0)
1058                                 {
1059                                 al=SSL_AD_DECRYPT_ERROR;
1060                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1061                                 goto f_err;
1062                                 }
1063                         if ((j != i) || (memcmp(p,md_buf,i) != 0))
1064                                 {
1065                                 /* bad signature */
1066                                 al=SSL_AD_DECRYPT_ERROR;
1067                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1068                                 goto f_err;
1069                                 }
1070                         }
1071                 else
1072 #endif
1073 #ifndef NO_DSA
1074                         if (pkey->type == EVP_PKEY_DSA)
1075                         {
1076                         /* lets do DSS */
1077                         EVP_VerifyInit(&md_ctx,EVP_dss1());
1078                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1079                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1080                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1081                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1082                                 {
1083                                 /* bad signature */
1084                                 al=SSL_AD_DECRYPT_ERROR;
1085                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1086                                 goto f_err;
1087                                 }
1088                         }
1089                 else
1090 #endif
1091                         {
1092                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1093                         goto err;
1094                         }
1095                 }
1096         else
1097                 {
1098                 /* still data left over */
1099                 if (!(alg & SSL_aNULL))
1100                         {
1101                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1102                         goto err;
1103                         }
1104                 if (n != 0)
1105                         {
1106                         al=SSL_AD_DECODE_ERROR;
1107                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1108                         goto f_err;
1109                         }
1110                 }
1111         EVP_PKEY_free(pkey);
1112         return(1);
1113 f_err:
1114         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1115 err:
1116         EVP_PKEY_free(pkey);
1117         return(-1);
1118         }
1119
1120 static int ssl3_get_certificate_request(SSL *s)
1121         {
1122         int ok,ret=0;
1123         unsigned long n,nc,l;
1124         unsigned int llen,ctype_num,i;
1125         X509_NAME *xn=NULL;
1126         unsigned char *p,*d,*q;
1127         STACK_OF(X509_NAME) *ca_sk=NULL;
1128
1129         n=ssl3_get_message(s,
1130                 SSL3_ST_CR_CERT_REQ_A,
1131                 SSL3_ST_CR_CERT_REQ_B,
1132                 -1,
1133 #if defined(MSDOS) && !defined(WIN32)
1134                 1024*30,  /* 30k max cert list :-) */
1135 #else
1136                 1024*100, /* 100k max cert list :-) */
1137 #endif
1138                 &ok);
1139
1140         if (!ok) return((int)n);
1141
1142         s->s3->tmp.cert_req=0;
1143
1144         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1145                 {
1146                 s->s3->tmp.reuse_message=1;
1147                 return(1);
1148                 }
1149
1150         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1151                 {
1152                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1153                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1154                 goto err;
1155                 }
1156
1157         /* TLS does not like anon-DH with client cert */
1158         if (s->version > SSL3_VERSION)
1159                 {
1160                 l=s->s3->tmp.new_cipher->algorithms;
1161                 if (l & SSL_aNULL)
1162                         {
1163                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1164                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1165                         goto err;
1166                         }
1167                 }
1168
1169         d=p=(unsigned char *)s->init_buf->data;
1170
1171         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1172                 {
1173                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1174                 goto err;
1175                 }
1176
1177         /* get the certificate types */
1178         ctype_num= *(p++);
1179         if (ctype_num > SSL3_CT_NUMBER)
1180                 ctype_num=SSL3_CT_NUMBER;
1181         for (i=0; i<ctype_num; i++)
1182                 s->s3->tmp.ctype[i]= p[i];
1183         p+=ctype_num;
1184
1185         /* get the CA RDNs */
1186         n2s(p,llen);
1187 #if 0
1188 {
1189 FILE *out;
1190 out=fopen("/tmp/vsign.der","w");
1191 fwrite(p,1,llen,out);
1192 fclose(out);
1193 }
1194 #endif
1195
1196         if ((llen+ctype_num+2+1) != n)
1197                 {
1198                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1199                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1200                 goto err;
1201                 }
1202
1203         for (nc=0; nc<llen; )
1204                 {
1205                 n2s(p,l);
1206                 if ((l+nc+2) > llen)
1207                         {
1208                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1209                                 goto cont; /* netscape bugs */
1210                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1211                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1212                         goto err;
1213                         }
1214
1215                 q=p;
1216
1217                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1218                         {
1219                         /* If netscape tollerance is on, ignore errors */
1220                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1221                                 goto cont;
1222                         else
1223                                 {
1224                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1225                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1226                                 goto err;
1227                                 }
1228                         }
1229
1230                 if (q != (p+l))
1231                         {
1232                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1233                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1234                         goto err;
1235                         }
1236                 if (!sk_X509_NAME_push(ca_sk,xn))
1237                         {
1238                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1239                         goto err;
1240                         }
1241
1242                 p+=l;
1243                 nc+=l+2;
1244                 }
1245
1246         if (0)
1247                 {
1248 cont:
1249                 ERR_clear_error();
1250                 }
1251
1252         /* we should setup a certficate to return.... */
1253         s->s3->tmp.cert_req=1;
1254         s->s3->tmp.ctype_num=ctype_num;
1255         if (s->s3->tmp.ca_names != NULL)
1256                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1257         s->s3->tmp.ca_names=ca_sk;
1258         ca_sk=NULL;
1259
1260         ret=1;
1261 err:
1262         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1263         return(ret);
1264         }
1265
1266 static int ca_dn_cmp(X509_NAME **a, X509_NAME **b)
1267         {
1268         return(X509_NAME_cmp(*a,*b));
1269         }
1270
1271 static int ssl3_get_server_done(SSL *s)
1272         {
1273         int ok,ret=0;
1274         long n;
1275
1276         n=ssl3_get_message(s,
1277                 SSL3_ST_CR_SRVR_DONE_A,
1278                 SSL3_ST_CR_SRVR_DONE_B,
1279                 SSL3_MT_SERVER_DONE,
1280                 30, /* should be very small, like 0 :-) */
1281                 &ok);
1282
1283         if (!ok) return((int)n);
1284         if (n > 0)
1285                 {
1286                 /* should contain no data */
1287                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1288                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1289                 }
1290         ret=1;
1291         return(ret);
1292         }
1293
1294 static int ssl3_send_client_key_exchange(SSL *s)
1295         {
1296         unsigned char *p,*d;
1297         int n;
1298         unsigned long l;
1299 #ifndef NO_RSA
1300         unsigned char *q;
1301         EVP_PKEY *pkey=NULL;
1302 #endif
1303
1304         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1305                 {
1306                 d=(unsigned char *)s->init_buf->data;
1307                 p= &(d[4]);
1308
1309                 l=s->s3->tmp.new_cipher->algorithms;
1310
1311 #ifndef NO_RSA
1312                 if (l & SSL_kRSA)
1313                         {
1314                         RSA *rsa;
1315                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1316
1317                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1318                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1319                         else
1320                                 {
1321                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1322                                 if ((pkey == NULL) ||
1323                                         (pkey->type != EVP_PKEY_RSA) ||
1324                                         (pkey->pkey.rsa == NULL))
1325                                         {
1326                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1327                                         goto err;
1328                                         }
1329                                 rsa=pkey->pkey.rsa;
1330                                 }
1331
1332                         tmp_buf[0]=s->client_version>>8;
1333                         tmp_buf[1]=s->client_version&0xff;
1334                         RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1335
1336                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1337
1338                         q=p;
1339                         /* Fix buf for TLS and beyond */
1340                         if (s->version > SSL3_VERSION)
1341                                 p+=2;
1342                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1343                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1344 #ifdef PKCS1_CHECK
1345                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1346                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1347 #endif
1348                         if (n <= 0)
1349                                 {
1350                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1351                                 goto err;
1352                                 }
1353
1354                         /* Fix buf for TLS and beyond */
1355                         if (s->version > SSL3_VERSION)
1356                                 {
1357                                 s2n(n,q);
1358                                 n+=2;
1359                                 }
1360
1361                         s->session->master_key_length=
1362                                 s->method->ssl3_enc->generate_master_secret(s,
1363                                         s->session->master_key,
1364                                         tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1365                         memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1366                         }
1367                 else
1368 #endif
1369 #ifndef NO_DH
1370                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1371                         {
1372                         DH *dh_srvr,*dh_clnt;
1373
1374                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1375                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1376                         else
1377                                 {
1378                                 /* we get them from the cert */
1379                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1380                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1381                                 goto err;
1382                                 }
1383
1384                         /* generate a new random key */
1385                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1386                                 {
1387                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1388                                 goto err;
1389                                 }
1390                         if (!DH_generate_key(dh_clnt))
1391                                 {
1392                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1393                                 goto err;
1394                                 }
1395
1396                         /* use the 'p' output buffer for the DH key, but
1397                          * make sure to clear it out afterwards */
1398
1399                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1400
1401                         if (n <= 0)
1402                                 {
1403                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1404                                 goto err;
1405                                 }
1406
1407                         /* generate master key from the result */
1408                         s->session->master_key_length=
1409                                 s->method->ssl3_enc->generate_master_secret(s,
1410                                         s->session->master_key,p,n);
1411                         /* clean up */
1412                         memset(p,0,n);
1413
1414                         /* send off the data */
1415                         n=BN_num_bytes(dh_clnt->pub_key);
1416                         s2n(n,p);
1417                         BN_bn2bin(dh_clnt->pub_key,p);
1418                         n+=2;
1419
1420                         DH_free(dh_clnt);
1421
1422                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1423                         }
1424                 else
1425 #endif
1426                         {
1427                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1428                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1429                         goto err;
1430                         }
1431
1432                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1433                 l2n3(n,d);
1434
1435                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1436                 /* number of bytes to write */
1437                 s->init_num=n+4;
1438                 s->init_off=0;
1439                 }
1440
1441         /* SSL3_ST_CW_KEY_EXCH_B */
1442         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1443 err:
1444         return(-1);
1445         }
1446
1447 static int ssl3_send_client_verify(SSL *s)
1448         {
1449         unsigned char *p,*d;
1450         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1451         EVP_PKEY *pkey;
1452 #ifndef NO_RSA
1453         int i=0;
1454 #endif
1455         unsigned long n;
1456 #ifndef NO_DSA
1457         int j;
1458 #endif
1459
1460         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1461                 {
1462                 d=(unsigned char *)s->init_buf->data;
1463                 p= &(d[4]);
1464                 pkey=s->cert->key->privatekey;
1465
1466                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1467                         &(data[MD5_DIGEST_LENGTH]));
1468
1469 #ifndef NO_RSA
1470                 if (pkey->type == EVP_PKEY_RSA)
1471                         {
1472                         s->method->ssl3_enc->cert_verify_mac(s,
1473                                 &(s->s3->finish_dgst1),&(data[0]));
1474                         i=RSA_private_encrypt(
1475                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1476                                 data,&(p[2]),pkey->pkey.rsa,
1477                                 RSA_PKCS1_PADDING);
1478                         if (i <= 0)
1479                                 {
1480                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1481                                 goto err;
1482                                 }
1483                         s2n(i,p);
1484                         n=i+2;
1485                         }
1486                 else
1487 #endif
1488 #ifndef NO_DSA
1489                         if (pkey->type == EVP_PKEY_DSA)
1490                         {
1491                         if (!DSA_sign(pkey->save_type,
1492                                 &(data[MD5_DIGEST_LENGTH]),
1493                                 SHA_DIGEST_LENGTH,&(p[2]),
1494                                 (unsigned int *)&j,pkey->pkey.dsa))
1495                                 {
1496                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1497                                 goto err;
1498                                 }
1499                         s2n(j,p);
1500                         n=j+2;
1501                         }
1502                 else
1503 #endif
1504                         {
1505                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,SSL_R_INTERNAL_ERROR);
1506                         goto err;
1507                         }
1508                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1509                 l2n3(n,d);
1510
1511                 s->init_num=(int)n+4;
1512                 s->init_off=0;
1513                 }
1514         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1515 err:
1516         return(-1);
1517         }
1518
1519 static int ssl3_send_client_certificate(SSL *s)
1520         {
1521         X509 *x509=NULL;
1522         EVP_PKEY *pkey=NULL;
1523         int i;
1524         unsigned long l;
1525
1526         if (s->state == SSL3_ST_CW_CERT_A)
1527                 {
1528                 if ((s->cert == NULL) ||
1529                         (s->cert->key->x509 == NULL) ||
1530                         (s->cert->key->privatekey == NULL))
1531                         s->state=SSL3_ST_CW_CERT_B;
1532                 else
1533                         s->state=SSL3_ST_CW_CERT_C;
1534                 }
1535
1536         /* We need to get a client cert */
1537         if (s->state == SSL3_ST_CW_CERT_B)
1538                 {
1539                 /* If we get an error, we need to
1540                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1541                  * We then get retied later */
1542                 i=0;
1543                 if (s->ctx->client_cert_cb != NULL)
1544                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1545                 if (i < 0)
1546                         {
1547                         s->rwstate=SSL_X509_LOOKUP;
1548                         return(-1);
1549                         }
1550                 s->rwstate=SSL_NOTHING;
1551                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1552                         {
1553                         s->state=SSL3_ST_CW_CERT_B;
1554                         if (    !SSL_use_certificate(s,x509) ||
1555                                 !SSL_use_PrivateKey(s,pkey))
1556                                 i=0;
1557                         }
1558                 else if (i == 1)
1559                         {
1560                         i=0;
1561                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1562                         }
1563
1564                 if (x509 != NULL) X509_free(x509);
1565                 if (pkey != NULL) EVP_PKEY_free(pkey);
1566                 if (i == 0)
1567                         {
1568                         if (s->version == SSL3_VERSION)
1569                                 {
1570                                 s->s3->tmp.cert_req=0;
1571                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1572                                 return(1);
1573                                 }
1574                         else
1575                                 {
1576                                 s->s3->tmp.cert_req=2;
1577                                 }
1578                         }
1579
1580                 /* Ok, we have a cert */
1581                 s->state=SSL3_ST_CW_CERT_C;
1582                 }
1583
1584         if (s->state == SSL3_ST_CW_CERT_C)
1585                 {
1586                 s->state=SSL3_ST_CW_CERT_D;
1587                 l=ssl3_output_cert_chain(s,
1588                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1589                 s->init_num=(int)l;
1590                 s->init_off=0;
1591                 }
1592         /* SSL3_ST_CW_CERT_D */
1593         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1594         }
1595
1596 #define has_bits(i,m)   (((i)&(m)) == (m))
1597
1598 static int ssl3_check_cert_and_algorithm(SSL *s)
1599         {
1600         int i,idx;
1601         long algs;
1602         EVP_PKEY *pkey=NULL;
1603         SESS_CERT *sc;
1604 #ifndef NO_RSA
1605         RSA *rsa;
1606 #endif
1607 #ifndef NO_DH
1608         DH *dh;
1609 #endif
1610
1611         sc=s->session->sess_cert;
1612
1613         if (sc == NULL)
1614                 {
1615                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_INTERNAL_ERROR);
1616                 goto err;
1617                 }
1618
1619         algs=s->s3->tmp.new_cipher->algorithms;
1620
1621         /* we don't have a certificate */
1622         if (algs & (SSL_aDH|SSL_aNULL))
1623                 return(1);
1624
1625 #ifndef NO_RSA
1626         rsa=s->session->sess_cert->peer_rsa_tmp;
1627 #endif
1628 #ifndef NO_DH
1629         dh=s->session->sess_cert->peer_dh_tmp;
1630 #endif
1631
1632         /* This is the passed certificate */
1633
1634         idx=sc->peer_cert_type;
1635         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1636         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1637         EVP_PKEY_free(pkey);
1638
1639
1640         /* Check that we have a certificate if we require one */
1641         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1642                 {
1643                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1644                 goto f_err;
1645                 }
1646 #ifndef NO_DSA
1647         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1648                 {
1649                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1650                 goto f_err;
1651                 }
1652 #endif
1653 #ifndef NO_RSA
1654         if ((algs & SSL_kRSA) &&
1655                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1656                 {
1657                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1658                 goto f_err;
1659                 }
1660 #endif
1661 #ifndef NO_DH
1662         if ((algs & SSL_kEDH) &&
1663                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1664                 {
1665                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1666                 goto f_err;
1667                 }
1668         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1669                 {
1670                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1671                 goto f_err;
1672                 }
1673 #ifndef NO_DSA
1674         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1675                 {
1676                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1677                 goto f_err;
1678                 }
1679 #endif
1680 #endif
1681
1682         if (SSL_IS_EXPORT(algs) && !has_bits(i,EVP_PKT_EXP))
1683                 {
1684 #ifndef NO_RSA
1685                 if (algs & SSL_kRSA)
1686                         {
1687                         if (rsa == NULL
1688                             || RSA_size(rsa) > SSL_EXPORT_PKEYLENGTH(algs))
1689                                 {
1690                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1691                                 goto f_err;
1692                                 }
1693                         }
1694                 else
1695 #endif
1696 #ifndef NO_DH
1697                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1698                             {
1699                             if (dh == NULL
1700                                 || DH_size(dh) > SSL_EXPORT_PKEYLENGTH(algs))
1701                                 {
1702                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1703                                 goto f_err;
1704                                 }
1705                         }
1706                 else
1707 #endif
1708                         {
1709                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1710                         goto f_err;
1711                         }
1712                 }
1713         return(1);
1714 f_err:
1715         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1716 err:
1717         return(0);
1718         }
1719