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                         ret=ssl3_send_client_certificate(s);
 258                         if (ret <= 0) goto end;
 259                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 260                         s->init_num=0;
 261                         break;
 262
 263                 case SSL3_ST_CW_KEY_EXCH_A:
 264                 case SSL3_ST_CW_KEY_EXCH_B:
 265                         ret=ssl3_send_client_key_exchange(s);
 266                         if (ret <= 0) goto end;
 267                         l=s->s3->tmp.new_cipher->algorithms;
 268                         /* EAY EAY EAY need to check for DH fix cert
 269                          * sent back */
 270                         /* For TLS, cert_req is set to 2, so a cert chain
 271                          * of nothing is sent, but no verify packet is sent */
 272                         if (s->s3->tmp.cert_req == 1)
 273                                 {
 274                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 275                                 }
 276                         else
 277                                 {
 278                                 s->state=SSL3_ST_CW_CHANGE_A;
 279                                 s->s3->change_cipher_spec=0;
 280                                 }
 281
 282                         s->init_num=0;
 283                         break;
 284
 285                 case SSL3_ST_CW_CERT_VRFY_A:
 286                 case SSL3_ST_CW_CERT_VRFY_B:
 287                         ret=ssl3_send_client_verify(s);
 288                         if (ret <= 0) goto end;
 289                         s->state=SSL3_ST_CW_CHANGE_A;
 290                         s->init_num=0;
 291                         s->s3->change_cipher_spec=0;
 292                         break;
 293
 294                 case SSL3_ST_CW_CHANGE_A:
 295                 case SSL3_ST_CW_CHANGE_B:
 296                         ret=ssl3_send_change_cipher_spec(s,
 297                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 298                         if (ret <= 0) goto end;
 299                         s->state=SSL3_ST_CW_FINISHED_A;
 300                         s->init_num=0;
 301
 302                         s->session->cipher=s->s3->tmp.new_cipher;
 303                         if (s->s3->tmp.new_compression == NULL)
 304                                 s->session->compress_meth=0;
 305                         else
 306                                 s->session->compress_meth=
 307                                         s->s3->tmp.new_compression->id;
 308                         if (!s->method->ssl3_enc->setup_key_block(s))
 309                                 {
 310                                 ret= -1;
 311                                 goto end;
 312                                 }
 313
 314                         if (!s->method->ssl3_enc->change_cipher_state(s,
 315                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 316                                 {
 317                                 ret= -1;
 318                                 goto end;
 319                                 }
 320
 321                         break;
 322
 323                 case SSL3_ST_CW_FINISHED_A:
 324                 case SSL3_ST_CW_FINISHED_B:
 325                         ret=ssl3_send_finished(s,
 326                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 327                                 s->method->ssl3_enc->client_finished,
 328                                 s->method->ssl3_enc->client_finished_len);
 329                         if (ret <= 0) goto end;
 330                         s->state=SSL3_ST_CW_FLUSH;
 331
 332                         /* clear flags */
 333                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 334                         if (s->hit)
 335                                 {
 336                                 s->s3->tmp.next_state=SSL_ST_OK;
 337                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 338                                         {
 339                                         s->state=SSL_ST_OK;
 340                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 341                                         s->s3->delay_buf_pop_ret=0;
 342                                         }
 343                                 }
 344                         else
 345                                 {
 346                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 347                                 }
 348                         s->init_num=0;
 349                         break;
 350
 351                 case SSL3_ST_CR_FINISHED_A:
 352                 case SSL3_ST_CR_FINISHED_B:
 353
 354                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 355                                 SSL3_ST_CR_FINISHED_B);
 356                         if (ret <= 0) goto end;
 357
 358                         if (s->hit)
 359                                 s->state=SSL3_ST_CW_CHANGE_A;
 360                         else
 361                                 s->state=SSL_ST_OK;
 362                         s->init_num=0;
 363                         break;
 364
 365                 case SSL3_ST_CW_FLUSH:
 366                         /* number of bytes to be flushed */
 367                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 368                         if (num1 > 0)
 369                                 {
 370                                 s->rwstate=SSL_WRITING;
 371                                 num1=BIO_flush(s->wbio);
 372                                 if (num1 <= 0) { ret= -1; goto end; }
 373                                 s->rwstate=SSL_NOTHING;
 374                                 }
 375
 376                         s->state=s->s3->tmp.next_state;
 377                         break;
 378
 379                 case SSL_ST_OK:
 380                         /* clean a few things up */
 381                         ssl3_cleanup_key_block(s);
 382
 383                         if (s->init_buf != NULL)
 384                                 {
 385                                 BUF_MEM_free(s->init_buf);
 386                                 s->init_buf=NULL;
 387                                 }
 388
 389                         /* If we are not 'joining' the last two packets,
 390                          * remove the buffering now */
 391                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 392                                 ssl_free_wbio_buffer(s);
 393                         /* else do it later in ssl3_write */
 394
 395                         s->init_num=0;
 396                         s->new_session=0;
 397
 398                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 399                         if (s->hit) s->ctx->stats.sess_hit++;
 400
 401                         ret=1;
 402                         /* s->server=0; */
 403                         s->handshake_func=ssl3_connect;
 404                         s->ctx->stats.sess_connect_good++;
 405
 406                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 407
 408                         goto end;
 409                         /* break; */
 410
 411                 default:
 412                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 413                         ret= -1;
 414                         goto end;
 415                         /* break; */
 416                         }
 417
 418                 /* did we do anything */
 419                 if (!s->s3->tmp.reuse_message && !skip)
 420                         {
 421                         if (s->debug)
 422                                 {
 423                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 424                                         goto end;
 425                                 }
 426
 427                         if ((cb != NULL) && (s->state != state))
 428                                 {
 429                                 new_state=s->state;
 430                                 s->state=state;
 431                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 432                                 s->state=new_state;
 433                                 }
 434                         }
 435                 skip=0;
 436                 }
 437 end:
 438         if (cb != NULL)
 439                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 440         s->in_handshake--;
 441         return(ret);
 442         }
 443
 444
 445 static int ssl3_client_hello(SSL *s)
 446         {
 447         unsigned char *buf;
 448         unsigned char *p,*d;
 449         int i,j;
 450         unsigned long Time,l;
 451         SSL_COMP *comp;
 452
 453         buf=(unsigned char *)s->init_buf->data;
 454         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 455                 {
 456                 if ((s->session == NULL) ||
 457                         (s->session->ssl_version != s->version) ||
 458                         (s->session->not_resumable))
 459                         {
 460                         if (!ssl_get_new_session(s,0))
 461                                 goto err;
 462                         }
 463                 /* else use the pre-loaded session */
 464
 465                 p=s->s3->client_random;
 466                 Time=time(NULL);                        /* Time */
 467                 l2n(Time,p);
 468                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 469
 470                 /* Do the message type and length last */
 471                 d=p= &(buf[4]);
 472
 473                 *(p++)=s->version>>8;
 474                 *(p++)=s->version&0xff;
 475                 s->client_version=s->version;
 476
 477                 /* Random stuff */
 478                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 479                 p+=SSL3_RANDOM_SIZE;
 480
 481                 /* Session ID */
 482                 if (s->new_session)
 483                         i=0;
 484                 else
 485                         i=s->session->session_id_length;
 486                 *(p++)=i;
 487                 if (i != 0)
 488                         {
 489                         memcpy(p,s->session->session_id,i);
 490                         p+=i;
 491                         }
 492
 493                 /* Ciphers supported */
 494                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 495                 if (i == 0)
 496                         {
 497                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 498                         goto err;
 499                         }
 500                 s2n(i,p);
 501                 p+=i;
 502
 503                 /* COMPRESSION */
 504                 if (s->ctx->comp_methods == NULL)
 505                         j=0;
 506                 else
 507                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 508                 *(p++)=1+j;
 509                 for (i=0; i<j; i++)
 510                         {
 511                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 512                         *(p++)=comp->id;
 513                         }
 514                 *(p++)=0; /* Add the NULL method */
 515
 516                 l=(p-d);
 517                 d=buf;
 518                 *(d++)=SSL3_MT_CLIENT_HELLO;
 519                 l2n3(l,d);
 520
 521                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 522                 /* number of bytes to write */
 523                 s->init_num=p-buf;
 524                 s->init_off=0;
 525                 }
 526
 527         /* SSL3_ST_CW_CLNT_HELLO_B */
 528         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 529 err:
 530         return(-1);
 531         }
 532
 533 static int ssl3_get_server_hello(SSL *s)
 534         {
 535         STACK_OF(SSL_CIPHER) *sk;
 536         SSL_CIPHER *c;
 537         unsigned char *p,*d;
 538         int i,al,ok;
 539         unsigned int j;
 540         long n;
 541         SSL_COMP *comp;
 542
 543         n=ssl3_get_message(s,
 544                 SSL3_ST_CR_SRVR_HELLO_A,
 545                 SSL3_ST_CR_SRVR_HELLO_B,
 546                 SSL3_MT_SERVER_HELLO,
 547                 300, /* ?? */
 548                 &ok);
 549
 550         if (!ok) return((int)n);
 551         d=p=(unsigned char *)s->init_buf->data;
 552
 553         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 554                 {
 555                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 556                 s->version=(s->version&0xff00)|p[1];
 557                 al=SSL_AD_PROTOCOL_VERSION;
 558                 goto f_err;
 559                 }
 560         p+=2;
 561
 562         /* load the server hello data */
 563         /* load the server random */
 564         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 565         p+=SSL3_RANDOM_SIZE;
 566
 567         /* get the session-id */
 568         j= *(p++);
 569
 570         if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
 571                 {
 572                 /* SSLref returns 16 :-( */
 573                 if (j < SSL2_SSL_SESSION_ID_LENGTH)
 574                         {
 575                         al=SSL_AD_ILLEGAL_PARAMETER;
 576                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
 577                         goto f_err;
 578                         }
 579                 }
 580         if (j != 0 && j == s->session->session_id_length
 581             && memcmp(p,s->session->session_id,j) == 0)
 582             {
 583             if(s->sid_ctx_length != s->session->sid_ctx_length
 584                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 585                 {
 586                 al=SSL_AD_ILLEGAL_PARAMETER;
 587                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 588                 goto f_err;
 589                 }
 590             s->hit=1;
 591             }
 592         else    /* a miss or crap from the other end */
 593                 {
 594                 /* If we were trying for session-id reuse, make a new
 595                  * SSL_SESSION so we don't stuff up other people */
 596                 s->hit=0;
 597                 if (s->session->session_id_length > 0)
 598                         {
 599                         if (!ssl_get_new_session(s,0))
 600                                 {
 601                                 al=SSL_AD_INTERNAL_ERROR;
 602                                 goto f_err;
 603                                 }
 604                         }
 605                 s->session->session_id_length=j;
 606                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 607                 }
 608         p+=j;
 609         c=ssl_get_cipher_by_char(s,p);
 610         if (c == NULL)
 611                 {
 612                 /* unknown cipher */
 613                 al=SSL_AD_ILLEGAL_PARAMETER;
 614                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 615                 goto f_err;
 616                 }
 617         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 618
 619         sk=ssl_get_ciphers_by_id(s);
 620         i=sk_SSL_CIPHER_find(sk,c);
 621         if (i < 0)
 622                 {
 623                 /* we did not say we would use this cipher */
 624                 al=SSL_AD_ILLEGAL_PARAMETER;
 625                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 626                 goto f_err;
 627                 }
 628
 629         if (s->hit && (s->session->cipher != c))
 630                 {
 631                 if (!(s->options &
 632                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 633                         {
 634                         al=SSL_AD_ILLEGAL_PARAMETER;
 635                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 636                         goto f_err;
 637                         }
 638                 }
 639         s->s3->tmp.new_cipher=c;
 640
 641         /* lets get the compression algorithm */
 642         /* COMPRESSION */
 643         j= *(p++);
 644         if (j == 0)
 645                 comp=NULL;
 646         else
 647                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 648
 649         if ((j != 0) && (comp == NULL))
 650                 {
 651                 al=SSL_AD_ILLEGAL_PARAMETER;
 652                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 653                 goto f_err;
 654                 }
 655         else
 656                 {
 657                 s->s3->tmp.new_compression=comp;
 658                 }
 659
 660         if (p != (d+n))
 661                 {
 662                 /* wrong packet length */
 663                 al=SSL_AD_DECODE_ERROR;
 664                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 665                 goto err;
 666                 }
 667
 668         return(1);
 669 f_err:
 670         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 671 err:
 672         return(-1);
 673         }
 674
 675 static int ssl3_get_server_certificate(SSL *s)
 676         {
 677         int al,i,ok,ret= -1;
 678         unsigned long n,nc,llen,l;
 679         X509 *x=NULL;
 680         unsigned char *p,*d,*q;
 681         STACK_OF(X509) *sk=NULL;
 682         CERT *c;
 683         EVP_PKEY *pkey=NULL;
 684
 685         n=ssl3_get_message(s,
 686                 SSL3_ST_CR_CERT_A,
 687                 SSL3_ST_CR_CERT_B,
 688                 -1,
 689 #if defined(MSDOS) && !defined(WIN32)
 690                 1024*30, /* 30k max cert list :-) */
 691 #else
 692                 1024*100, /* 100k max cert list :-) */
 693 #endif
 694                 &ok);
 695
 696         if (!ok) return((int)n);
 697
 698         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 699                 {
 700                 s->s3->tmp.reuse_message=1;
 701                 return(1);
 702                 }
 703
 704         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 705                 {
 706                 al=SSL_AD_UNEXPECTED_MESSAGE;
 707                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 708                 goto f_err;
 709                 }
 710         d=p=(unsigned char *)s->init_buf->data;
 711
 712         if ((sk=sk_X509_new_null()) == NULL)
 713                 {
 714                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 715                 goto err;
 716                 }
 717
 718         n2l3(p,llen);
 719         if (llen+3 != n)
 720                 {
 721                 al=SSL_AD_DECODE_ERROR;
 722                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 723                 goto f_err;
 724                 }
 725         for (nc=0; nc<llen; )
 726                 {
 727                 n2l3(p,l);
 728                 if ((l+nc+3) > llen)
 729                         {
 730                         al=SSL_AD_DECODE_ERROR;
 731                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 732                         goto f_err;
 733                         }
 734
 735                 q=p;
 736                 x=d2i_X509(NULL,&q,l);
 737                 if (x == NULL)
 738                         {
 739                         al=SSL_AD_BAD_CERTIFICATE;
 740                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 741                         goto f_err;
 742                         }
 743                 if (q != (p+l))
 744                         {
 745                         al=SSL_AD_DECODE_ERROR;
 746                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 747                         goto f_err;
 748                         }
 749                 if (!sk_X509_push(sk,x))
 750                         {
 751                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 752                         goto err;
 753                         }
 754                 x=NULL;
 755                 nc+=l+3;
 756                 p=q;
 757                 }
 758
 759         i=ssl_verify_cert_chain(s,sk);
 760         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 761                 {
 762                 al=ssl_verify_alarm_type(s->verify_result);
 763                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 764                 goto f_err;
 765                 }
 766
 767         c=ssl_cert_new();
 768         if (c == NULL) goto err;
 769
 770         if (s->session->sess_cert) ssl_cert_free(s->session->sess_cert);
 771         s->session->sess_cert=c;
 772
 773         c->cert_chain=sk;
 774         x=sk_X509_value(sk,0);
 775         sk=NULL;
 776
 777         pkey=X509_get_pubkey(x);
 778
 779         if ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))
 780                 {
 781                 x=NULL;
 782                 al=SSL3_AL_FATAL;
 783                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 784                 goto f_err;
 785                 }
 786
 787         i=ssl_cert_type(x,pkey);
 788         if (i < 0)
 789                 {
 790                 x=NULL;
 791                 al=SSL3_AL_FATAL;
 792                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 793                 goto f_err;
 794                 }
 795
 796         c->cert_type=i;
 797         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 798         if (c->pkeys[i].x509 != NULL)
 799                 X509_free(c->pkeys[i].x509);
 800         c->pkeys[i].x509=x;
 801         c->key= &(c->pkeys[i]);
 802
 803         if ((s->session != NULL) && (s->session->peer != NULL))
 804                 X509_free(s->session->peer);
 805         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 806         s->session->peer=x;
 807
 808         x=NULL;
 809         ret=1;
 810
 811         if (0)
 812                 {
 813 f_err:
 814                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 815                 }
 816 err:
 817         EVP_PKEY_free(pkey);
 818         X509_free(x);
 819         sk_X509_pop_free(sk,X509_free);
 820         return(ret);
 821         }
 822
 823 static int ssl3_get_key_exchange(SSL *s)
 824         {
 825 #ifndef NO_RSA
 826         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 827 #endif
 828         EVP_MD_CTX md_ctx;
 829         unsigned char *param,*p;
 830         int al,i,j,param_len,ok;
 831         long n,alg;
 832         EVP_PKEY *pkey=NULL;
 833 #ifndef NO_RSA
 834         RSA *rsa=NULL;
 835 #endif
 836 #ifndef NO_DH
 837         DH *dh=NULL;
 838 #endif
 839
 840         n=ssl3_get_message(s,
 841                 SSL3_ST_CR_KEY_EXCH_A,
 842                 SSL3_ST_CR_KEY_EXCH_B,
 843                 -1,
 844                 1024*8, /* ?? */
 845                 &ok);
 846
 847         if (!ok) return((int)n);
 848
 849         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 850                 {
 851                 s->s3->tmp.reuse_message=1;
 852                 return(1);
 853                 }
 854
 855         param=p=(unsigned char *)s->init_buf->data;
 856
 857         if (s->session->sess_cert != NULL)
 858                 {
 859 #ifndef NO_RSA
 860                 if (s->session->sess_cert->rsa_tmp != NULL)
 861                         {
 862                         RSA_free(s->session->sess_cert->rsa_tmp);
 863                         s->session->sess_cert->rsa_tmp=NULL;
 864                         }
 865 #endif
 866 #ifndef NO_DH
 867                 if (s->session->sess_cert->dh_tmp)
 868                         {
 869                         DH_free(s->session->sess_cert->dh_tmp);
 870                         s->session->sess_cert->dh_tmp=NULL;
 871                         }
 872 #endif
 873                 }
 874         else
 875                 {
 876                 s->session->sess_cert=ssl_cert_new();
 877                 }
 878
 879         param_len=0;
 880         alg=s->s3->tmp.new_cipher->algorithms;
 881
 882 #ifndef NO_RSA
 883         if (alg & SSL_kRSA)
 884                 {
 885                 if ((rsa=RSA_new()) == NULL)
 886                         {
 887                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 888                         goto err;
 889                         }
 890                 n2s(p,i);
 891                 param_len=i+2;
 892                 if (param_len > n)
 893                         {
 894                         al=SSL_AD_DECODE_ERROR;
 895                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
 896                         goto f_err;
 897                         }
 898                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
 899                         {
 900                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 901                         goto err;
 902                         }
 903                 p+=i;
 904
 905                 n2s(p,i);
 906                 param_len+=i+2;
 907                 if (param_len > n)
 908                         {
 909                         al=SSL_AD_DECODE_ERROR;
 910                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
 911                         goto f_err;
 912                         }
 913                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
 914                         {
 915                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 916                         goto err;
 917                         }
 918                 p+=i;
 919                 n-=param_len;
 920
 921                 /* this should be because we are using an export cipher */
 922                 if (alg & SSL_aRSA)
 923                         pkey=X509_get_pubkey(s->session->sess_cert->pkeys[SSL_PKEY_RSA_ENC].x509);
 924                 else
 925                         {
 926                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
 927                         goto err;
 928                         }
 929                 s->session->sess_cert->rsa_tmp=rsa;
 930                 }
 931         else
 932 #endif
 933 #ifndef NO_DH
 934                 if (alg & SSL_kEDH)
 935                 {
 936                 if ((dh=DH_new()) == NULL)
 937                         {
 938                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
 939                         goto err;
 940                         }
 941                 n2s(p,i);
 942                 param_len=i+2;
 943                 if (param_len > n)
 944                         {
 945                         al=SSL_AD_DECODE_ERROR;
 946                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
 947                         goto f_err;
 948                         }
 949                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
 950                         {
 951                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 952                         goto err;
 953                         }
 954                 p+=i;
 955
 956                 n2s(p,i);
 957                 param_len+=i+2;
 958                 if (param_len > n)
 959                         {
 960                         al=SSL_AD_DECODE_ERROR;
 961                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
 962                         goto f_err;
 963                         }
 964                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
 965                         {
 966                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 967                         goto err;
 968                         }
 969                 p+=i;
 970
 971                 n2s(p,i);
 972                 param_len+=i+2;
 973                 if (param_len > n)
 974                         {
 975                         al=SSL_AD_DECODE_ERROR;
 976                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
 977                         goto f_err;
 978                         }
 979                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
 980                         {
 981                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 982                         goto err;
 983                         }
 984                 p+=i;
 985                 n-=param_len;
 986
 987 #ifndef NO_RSA
 988                 if (alg & SSL_aRSA)
 989                         pkey=X509_get_pubkey(s->session->sess_cert->pkeys[SSL_PKEY_RSA_ENC].x509);
 990                 else
 991 #endif
 992 #ifndef NO_DSA
 993                 if (alg & SSL_aDSS)
 994                         pkey=X509_get_pubkey(s->session->sess_cert->pkeys[SSL_PKEY_DSA_SIGN].x509);
 995 #endif
 996                 /* else anonymous DH, so no certificate or pkey. */
 997
 998                 s->session->sess_cert->dh_tmp=dh;
 999                 dh=NULL;
1000                 }
1001         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1002                 {
1003                 al=SSL_AD_ILLEGAL_PARAMETER;
1004                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1005                 goto f_err;
1006                 }
1007 #endif
1008         if (alg & SSL_aFZA)
1009                 {
1010                 al=SSL_AD_HANDSHAKE_FAILURE;
1011                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1012                 goto f_err;
1013                 }
1014
1015
1016         /* p points to the next byte, there are 'n' bytes left */
1017
1018
1019         /* if it was signed, check the signature */
1020         if (pkey != NULL)
1021                 {
1022                 n2s(p,i);
1023                 n-=2;
1024                 j=EVP_PKEY_size(pkey);
1025
1026                 if ((i != n) || (n > j) || (n <= 0))
1027                         {
1028                         /* wrong packet length */
1029                         al=SSL_AD_DECODE_ERROR;
1030                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1031                         goto f_err;
1032                         }
1033
1034 #ifndef NO_RSA
1035                 if (pkey->type == EVP_PKEY_RSA)
1036                         {
1037                         int num;
1038
1039                         j=0;
1040                         q=md_buf;
1041                         for (num=2; num > 0; num--)
1042                                 {
1043                                 EVP_DigestInit(&md_ctx,(num == 2)
1044                                         ?s->ctx->md5:s->ctx->sha1);
1045                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1046                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1047                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1048                                 EVP_DigestFinal(&md_ctx,q,(unsigned int *)&i);
1049                                 q+=i;
1050                                 j+=i;
1051                                 }
1052                         i=RSA_public_decrypt((int)n,p,p,pkey->pkey.rsa,
1053                                 RSA_PKCS1_PADDING);
1054                         if (i <= 0)
1055                                 {
1056                                 al=SSL_AD_DECRYPT_ERROR;
1057                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1058                                 goto f_err;
1059                                 }
1060                         if ((j != i) || (memcmp(p,md_buf,i) != 0))
1061                                 {
1062                                 /* bad signature */
1063                                 al=SSL_AD_DECRYPT_ERROR;
1064                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1065                                 goto f_err;
1066                                 }
1067                         }
1068                 else
1069 #endif
1070 #ifndef NO_DSA
1071                         if (pkey->type == EVP_PKEY_DSA)
1072                         {
1073                         /* lets do DSS */
1074                         EVP_VerifyInit(&md_ctx,EVP_dss1());
1075                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1076                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1077                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1078                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1079                                 {
1080                                 /* bad signature */
1081                                 al=SSL_AD_DECRYPT_ERROR;
1082                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1083                                 goto f_err;
1084                                 }
1085                         }
1086                 else
1087 #endif
1088                         {
1089                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1090                         goto err;
1091                         }
1092                 }
1093         else
1094                 {
1095                 /* still data left over */
1096                 if (!(alg & SSL_aNULL))
1097                         {
1098                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1099                         goto err;
1100                         }
1101                 if (n != 0)
1102                         {
1103                         al=SSL_AD_DECODE_ERROR;
1104                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1105                         goto f_err;
1106                         }
1107                 }
1108         EVP_PKEY_free(pkey);
1109         return(1);
1110 f_err:
1111         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1112 err:
1113         EVP_PKEY_free(pkey);
1114         return(-1);
1115         }
1116
1117 static int ssl3_get_certificate_request(SSL *s)
1118         {
1119         int ok,ret=0;
1120         unsigned long n,nc,l;
1121         unsigned int llen,ctype_num,i;
1122         X509_NAME *xn=NULL;
1123         unsigned char *p,*d,*q;
1124         STACK_OF(X509_NAME) *ca_sk=NULL;
1125
1126         n=ssl3_get_message(s,
1127                 SSL3_ST_CR_CERT_REQ_A,
1128                 SSL3_ST_CR_CERT_REQ_B,
1129                 -1,
1130 #if defined(MSDOS) && !defined(WIN32)
1131                 1024*30,  /* 30k max cert list :-) */
1132 #else
1133                 1024*100, /* 100k max cert list :-) */
1134 #endif
1135                 &ok);
1136
1137         if (!ok) return((int)n);
1138
1139         s->s3->tmp.cert_req=0;
1140
1141         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1142                 {
1143                 s->s3->tmp.reuse_message=1;
1144                 return(1);
1145                 }
1146
1147         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1148                 {
1149                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1150                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1151                 goto err;
1152                 }
1153
1154         /* TLS does not like anon-DH with client cert */
1155         if (s->version > SSL3_VERSION)
1156                 {
1157                 l=s->s3->tmp.new_cipher->algorithms;
1158                 if (l & SSL_aNULL)
1159                         {
1160                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1161                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1162                         goto err;
1163                         }
1164                 }
1165
1166         d=p=(unsigned char *)s->init_buf->data;
1167
1168         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1169                 {
1170                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1171                 goto err;
1172                 }
1173
1174         /* get the certificate types */
1175         ctype_num= *(p++);
1176         if (ctype_num > SSL3_CT_NUMBER)
1177                 ctype_num=SSL3_CT_NUMBER;
1178         for (i=0; i<ctype_num; i++)
1179                 s->s3->tmp.ctype[i]= p[i];
1180         p+=ctype_num;
1181
1182         /* get the CA RDNs */
1183         n2s(p,llen);
1184 #if 0
1185 {
1186 FILE *out;
1187 out=fopen("/tmp/vsign.der","w");
1188 fwrite(p,1,llen,out);
1189 fclose(out);
1190 }
1191 #endif
1192
1193         if ((llen+ctype_num+2+1) != n)
1194                 {
1195                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1196                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1197                 goto err;
1198                 }
1199
1200         for (nc=0; nc<llen; )
1201                 {
1202                 n2s(p,l);
1203                 if ((l+nc+2) > llen)
1204                         {
1205                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1206                                 goto cont; /* netscape bugs */
1207                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1208                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1209                         goto err;
1210                         }
1211
1212                 q=p;
1213
1214                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1215                         {
1216                         /* If netscape tollerance is on, ignore errors */
1217                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1218                                 goto cont;
1219                         else
1220                                 {
1221                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1222                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1223                                 goto err;
1224                                 }
1225                         }
1226
1227                 if (q != (p+l))
1228                         {
1229                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1230                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1231                         goto err;
1232                         }
1233                 if (!sk_X509_NAME_push(ca_sk,xn))
1234                         {
1235                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1236                         goto err;
1237                         }
1238
1239                 p+=l;
1240                 nc+=l+2;
1241                 }
1242
1243         if (0)
1244                 {
1245 cont:
1246                 ERR_clear_error();
1247                 }
1248
1249         /* we should setup a certficate to return.... */
1250         s->s3->tmp.cert_req=1;
1251         s->s3->tmp.ctype_num=ctype_num;
1252         if (s->s3->tmp.ca_names != NULL)
1253                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1254         s->s3->tmp.ca_names=ca_sk;
1255         ca_sk=NULL;
1256
1257         ret=1;
1258 err:
1259         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1260         return(ret);
1261         }
1262
1263 static int ca_dn_cmp(X509_NAME **a, X509_NAME **b)
1264         {
1265         return(X509_NAME_cmp(*a,*b));
1266         }
1267
1268 static int ssl3_get_server_done(SSL *s)
1269         {
1270         int ok,ret=0;
1271         long n;
1272
1273         n=ssl3_get_message(s,
1274                 SSL3_ST_CR_SRVR_DONE_A,
1275                 SSL3_ST_CR_SRVR_DONE_B,
1276                 SSL3_MT_SERVER_DONE,
1277                 30, /* should be very small, like 0 :-) */
1278                 &ok);
1279
1280         if (!ok) return((int)n);
1281         if (n > 0)
1282                 {
1283                 /* should contain no data */
1284                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1285                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1286                 }
1287         ret=1;
1288         return(ret);
1289         }
1290
1291 static int ssl3_send_client_key_exchange(SSL *s)
1292         {
1293         unsigned char *p,*d;
1294         int n;
1295         unsigned long l;
1296 #ifndef NO_RSA
1297         unsigned char *q;
1298         EVP_PKEY *pkey=NULL;
1299 #endif
1300
1301         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1302                 {
1303                 d=(unsigned char *)s->init_buf->data;
1304                 p= &(d[4]);
1305
1306                 l=s->s3->tmp.new_cipher->algorithms;
1307
1308 #ifndef NO_RSA
1309                 if (l & SSL_kRSA)
1310                         {
1311                         RSA *rsa;
1312                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1313
1314                         if (s->session->sess_cert->rsa_tmp != NULL)
1315                                 rsa=s->session->sess_cert->rsa_tmp;
1316                         else
1317                                 {
1318                                 pkey=X509_get_pubkey(s->session->sess_cert->pkeys[SSL_PKEY_RSA_ENC].x509);
1319                                 if ((pkey == NULL) ||
1320                                         (pkey->type != EVP_PKEY_RSA) ||
1321                                         (pkey->pkey.rsa == NULL))
1322                                         {
1323                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1324                                         goto err;
1325                                         }
1326                                 rsa=pkey->pkey.rsa;
1327                                 }
1328
1329                         tmp_buf[0]=s->client_version>>8;
1330                         tmp_buf[1]=s->client_version&0xff;
1331                         RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1332
1333                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1334
1335                         q=p;
1336                         /* Fix buf for TLS and beyond */
1337                         if (s->version > SSL3_VERSION)
1338                                 p+=2;
1339                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1340                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1341 #ifdef PKCS1_CHECK
1342                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1343                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1344 #endif
1345                         if (n <= 0)
1346                                 {
1347                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1348                                 goto err;
1349                                 }
1350
1351                         /* Fix buf for TLS and beyond */
1352                         if (s->version > SSL3_VERSION)
1353                                 {
1354                                 s2n(n,q);
1355                                 n+=2;
1356                                 }
1357
1358                         s->session->master_key_length=
1359                                 s->method->ssl3_enc->generate_master_secret(s,
1360                                         s->session->master_key,
1361                                         tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1362                         memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1363                         }
1364                 else
1365 #endif
1366 #ifndef NO_DH
1367                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1368                         {
1369                         DH *dh_srvr,*dh_clnt;
1370
1371                         if (s->session->sess_cert->dh_tmp != NULL)
1372                                 dh_srvr=s->session->sess_cert->dh_tmp;
1373                         else
1374                                 {
1375                                 /* we get them from the cert */
1376                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1377                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1378                                 goto err;
1379                                 }
1380
1381                         /* generate a new random key */
1382                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1383                                 {
1384                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1385                                 goto err;
1386                                 }
1387                         if (!DH_generate_key(dh_clnt))
1388                                 {
1389                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1390                                 goto err;
1391                                 }
1392
1393                         /* use the 'p' output buffer for the DH key, but
1394                          * make sure to clear it out afterwards */
1395
1396                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1397
1398                         if (n <= 0)
1399                                 {
1400                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1401                                 goto err;
1402                                 }
1403
1404                         /* generate master key from the result */
1405                         s->session->master_key_length=
1406                                 s->method->ssl3_enc->generate_master_secret(s,
1407                                         s->session->master_key,p,n);
1408                         /* clean up */
1409                         memset(p,0,n);
1410
1411                         /* send off the data */
1412                         n=BN_num_bytes(dh_clnt->pub_key);
1413                         s2n(n,p);
1414                         BN_bn2bin(dh_clnt->pub_key,p);
1415                         n+=2;
1416
1417                         DH_free(dh_clnt);
1418
1419                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1420                         }
1421                 else
1422 #endif
1423                         {
1424                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1425                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1426                         goto err;
1427                         }
1428
1429                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1430                 l2n3(n,d);
1431
1432                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1433                 /* number of bytes to write */
1434                 s->init_num=n+4;
1435                 s->init_off=0;
1436                 }
1437
1438         /* SSL3_ST_CW_KEY_EXCH_B */
1439         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1440 err:
1441         return(-1);
1442         }
1443
1444 static int ssl3_send_client_verify(SSL *s)
1445         {
1446         unsigned char *p,*d;
1447         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1448         EVP_PKEY *pkey;
1449 #ifndef NO_RSA
1450         int i=0;
1451 #endif
1452         unsigned long n;
1453 #ifndef NO_DSA
1454         int j;
1455 #endif
1456
1457         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1458                 {
1459                 d=(unsigned char *)s->init_buf->data;
1460                 p= &(d[4]);
1461                 pkey=s->cert->key->privatekey;
1462
1463                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1464                         &(data[MD5_DIGEST_LENGTH]));
1465
1466 #ifndef NO_RSA
1467                 if (pkey->type == EVP_PKEY_RSA)
1468                         {
1469                         s->method->ssl3_enc->cert_verify_mac(s,
1470                                 &(s->s3->finish_dgst1),&(data[0]));
1471                         i=RSA_private_encrypt(
1472                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1473                                 data,&(p[2]),pkey->pkey.rsa,
1474                                 RSA_PKCS1_PADDING);
1475                         if (i <= 0)
1476                                 {
1477                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1478                                 goto err;
1479                                 }
1480                         s2n(i,p);
1481                         n=i+2;
1482                         }
1483                 else
1484 #endif
1485 #ifndef NO_DSA
1486                         if (pkey->type == EVP_PKEY_DSA)
1487                         {
1488                         if (!DSA_sign(pkey->save_type,
1489                                 &(data[MD5_DIGEST_LENGTH]),
1490                                 SHA_DIGEST_LENGTH,&(p[2]),
1491                                 (unsigned int *)&j,pkey->pkey.dsa))
1492                                 {
1493                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1494                                 goto err;
1495                                 }
1496                         s2n(j,p);
1497                         n=j+2;
1498                         }
1499                 else
1500 #endif
1501                         {
1502                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,SSL_R_INTERNAL_ERROR);
1503                         goto err;
1504                         }
1505                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1506                 l2n3(n,d);
1507
1508                 s->init_num=(int)n+4;
1509                 s->init_off=0;
1510                 }
1511         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1512 err:
1513         return(-1);
1514         }
1515
1516 static int ssl3_send_client_certificate(SSL *s)
1517         {
1518         X509 *x509=NULL;
1519         EVP_PKEY *pkey=NULL;
1520         int i;
1521         unsigned long l;
1522
1523         if (s->state == SSL3_ST_CW_CERT_A)
1524                 {
1525                 if ((s->cert == NULL) ||
1526                         (s->cert->key->x509 == NULL) ||
1527                         (s->cert->key->privatekey == NULL))
1528                         s->state=SSL3_ST_CW_CERT_B;
1529                 else
1530                         s->state=SSL3_ST_CW_CERT_C;
1531                 }
1532
1533         /* We need to get a client cert */
1534         if (s->state == SSL3_ST_CW_CERT_B)
1535                 {
1536                 /* If we get an error, we need to
1537                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1538                  * We then get retied later */
1539                 i=0;
1540                 if (s->ctx->client_cert_cb != NULL)
1541                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1542                 if (i < 0)
1543                         {
1544                         s->rwstate=SSL_X509_LOOKUP;
1545                         return(-1);
1546                         }
1547                 s->rwstate=SSL_NOTHING;
1548                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1549                         {
1550                         s->state=SSL3_ST_CW_CERT_B;
1551                         if (    !SSL_use_certificate(s,x509) ||
1552                                 !SSL_use_PrivateKey(s,pkey))
1553                                 i=0;
1554                         }
1555                 else if (i == 1)
1556                         {
1557                         i=0;
1558                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1559                         }
1560
1561                 if (x509 != NULL) X509_free(x509);
1562                 if (pkey != NULL) EVP_PKEY_free(pkey);
1563                 if (i == 0)
1564                         {
1565                         if (s->version == SSL3_VERSION)
1566                                 {
1567                                 s->s3->tmp.cert_req=0;
1568                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1569                                 return(1);
1570                                 }
1571                         else
1572                                 {
1573                                 s->s3->tmp.cert_req=2;
1574                                 }
1575                         }
1576
1577                 /* Ok, we have a cert */
1578                 s->state=SSL3_ST_CW_CERT_C;
1579                 }
1580
1581         if (s->state == SSL3_ST_CW_CERT_C)
1582                 {
1583                 s->state=SSL3_ST_CW_CERT_D;
1584                 l=ssl3_output_cert_chain(s,
1585                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1586                 s->init_num=(int)l;
1587                 s->init_off=0;
1588                 }
1589         /* SSL3_ST_CW_CERT_D */
1590         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1591         }
1592
1593 #define has_bits(i,m)   (((i)&(m)) == (m))
1594
1595 static int ssl3_check_cert_and_algorithm(SSL *s)
1596         {
1597         int i,idx;
1598         long algs;
1599         EVP_PKEY *pkey=NULL;
1600         CERT *c;
1601 #ifndef NO_RSA
1602         RSA *rsa;
1603 #endif
1604 #ifndef NO_DH
1605         DH *dh;
1606 #endif
1607
1608         c=s->session->sess_cert;
1609
1610         if (c == NULL)
1611                 {
1612                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_INTERNAL_ERROR);
1613                 goto err;
1614                 }
1615
1616         algs=s->s3->tmp.new_cipher->algorithms;
1617
1618         /* we don't have a certificate */
1619         if (algs & (SSL_aDH|SSL_aNULL))
1620                 return(1);
1621
1622 #ifndef NO_RSA
1623         rsa=s->session->sess_cert->rsa_tmp;
1624 #endif
1625 #ifndef NO_DH
1626         dh=s->session->sess_cert->dh_tmp;
1627 #endif
1628
1629         /* This is the passed certificate */
1630
1631         idx=c->cert_type;
1632         pkey=X509_get_pubkey(c->pkeys[idx].x509);
1633         i=X509_certificate_type(c->pkeys[idx].x509,pkey);
1634         EVP_PKEY_free(pkey);
1635
1636
1637         /* Check that we have a certificate if we require one */
1638         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1639                 {
1640                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1641                 goto f_err;
1642                 }
1643 #ifndef NO_DSA
1644         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1645                 {
1646                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1647                 goto f_err;
1648                 }
1649 #endif
1650 #ifndef NO_RSA
1651         if ((algs & SSL_kRSA) &&
1652                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1653                 {
1654                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1655                 goto f_err;
1656                 }
1657 #endif
1658 #ifndef NO_DH
1659         if ((algs & SSL_kEDH) &&
1660                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1661                 {
1662                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1663                 goto f_err;
1664                 }
1665         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1666                 {
1667                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1668                 goto f_err;
1669                 }
1670 #ifndef NO_DSA
1671         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1672                 {
1673                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1674                 goto f_err;
1675                 }
1676 #endif
1677 #endif
1678
1679         if (SSL_IS_EXPORT(algs) && !has_bits(i,EVP_PKT_EXP))
1680                 {
1681 #ifndef NO_RSA
1682                 if (algs & SSL_kRSA)
1683                         {
1684                         if (rsa == NULL
1685                             || RSA_size(rsa) > SSL_EXPORT_PKEYLENGTH(algs))
1686                                 {
1687                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1688                                 goto f_err;
1689                                 }
1690                         }
1691                 else
1692 #endif
1693 #ifndef NO_DH
1694                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1695                             {
1696                             if (dh == NULL
1697                                 || DH_size(dh) > SSL_EXPORT_PKEYLENGTH(algs))
1698                                 {
1699                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1700                                 goto f_err;
1701                                 }
1702                         }
1703                 else
1704 #endif
1705                         {
1706                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1707                         goto f_err;
1708                         }
1709                 }
1710         return(1);
1711 f_err:
1712         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1713 err:
1714         return(0);
1715         }
1716