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_add(&Time,sizeof(Time),0);
 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_label,
 329                                 s->method->ssl3_enc->client_finished_label_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_pseudo_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         ERR_clear_error(); /* but we keep s->verify_result */
 768
 769         sc=ssl_sess_cert_new();
 770         if (sc == NULL) goto err;
 771
 772         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 773         s->session->sess_cert=sc;
 774
 775         sc->cert_chain=sk;
 776         /* Inconsistency alert: cert_chain does include the peer's
 777          * certificate, which we don't include in s3_srvr.c */
 778         x=sk_X509_value(sk,0);
 779         sk=NULL;
 780
 781         pkey=X509_get_pubkey(x);
 782
 783         if ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))
 784                 {
 785                 x=NULL;
 786                 al=SSL3_AL_FATAL;
 787                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 788                 goto f_err;
 789                 }
 790
 791         i=ssl_cert_type(x,pkey);
 792         if (i < 0)
 793                 {
 794                 x=NULL;
 795                 al=SSL3_AL_FATAL;
 796                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 797                 goto f_err;
 798                 }
 799
 800         sc->peer_cert_type=i;
 801         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 802         if (sc->peer_pkeys[i].x509 != NULL) /* Why would this ever happen?
 803                                                                                  * We just created sc a couple of
 804                                                                                  * lines ago. */
 805                 X509_free(sc->peer_pkeys[i].x509);
 806         sc->peer_pkeys[i].x509=x;
 807         sc->peer_key= &(sc->peer_pkeys[i]);
 808
 809         if (s->session->peer != NULL)
 810                 X509_free(s->session->peer);
 811         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 812         s->session->peer=x;
 813
 814         x=NULL;
 815         ret=1;
 816
 817         if (0)
 818                 {
 819 f_err:
 820                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 821                 }
 822 err:
 823         EVP_PKEY_free(pkey);
 824         X509_free(x);
 825         sk_X509_pop_free(sk,X509_free);
 826         return(ret);
 827         }
 828
 829 static int ssl3_get_key_exchange(SSL *s)
 830         {
 831 #ifndef NO_RSA
 832         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 833 #endif
 834         EVP_MD_CTX md_ctx;
 835         unsigned char *param,*p;
 836         int al,i,j,param_len,ok;
 837         long n,alg;
 838         EVP_PKEY *pkey=NULL;
 839 #ifndef NO_RSA
 840         RSA *rsa=NULL;
 841 #endif
 842 #ifndef NO_DH
 843         DH *dh=NULL;
 844 #endif
 845
 846         n=ssl3_get_message(s,
 847                 SSL3_ST_CR_KEY_EXCH_A,
 848                 SSL3_ST_CR_KEY_EXCH_B,
 849                 -1,
 850                 1024*8, /* ?? */
 851                 &ok);
 852
 853         if (!ok) return((int)n);
 854
 855         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 856                 {
 857                 s->s3->tmp.reuse_message=1;
 858                 return(1);
 859                 }
 860
 861         param=p=(unsigned char *)s->init_buf->data;
 862
 863         if (s->session->sess_cert != NULL)
 864                 {
 865 #ifndef NO_RSA
 866                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
 867                         {
 868                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
 869                         s->session->sess_cert->peer_rsa_tmp=NULL;
 870                         }
 871 #endif
 872 #ifndef NO_DH
 873                 if (s->session->sess_cert->peer_dh_tmp)
 874                         {
 875                         DH_free(s->session->sess_cert->peer_dh_tmp);
 876                         s->session->sess_cert->peer_dh_tmp=NULL;
 877                         }
 878 #endif
 879                 }
 880         else
 881                 {
 882                 s->session->sess_cert=ssl_sess_cert_new();
 883                 }
 884
 885         param_len=0;
 886         alg=s->s3->tmp.new_cipher->algorithms;
 887
 888 #ifndef NO_RSA
 889         if (alg & SSL_kRSA)
 890                 {
 891                 if ((rsa=RSA_new()) == NULL)
 892                         {
 893                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 894                         goto err;
 895                         }
 896                 n2s(p,i);
 897                 param_len=i+2;
 898                 if (param_len > n)
 899                         {
 900                         al=SSL_AD_DECODE_ERROR;
 901                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
 902                         goto f_err;
 903                         }
 904                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
 905                         {
 906                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 907                         goto err;
 908                         }
 909                 p+=i;
 910
 911                 n2s(p,i);
 912                 param_len+=i+2;
 913                 if (param_len > n)
 914                         {
 915                         al=SSL_AD_DECODE_ERROR;
 916                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
 917                         goto f_err;
 918                         }
 919                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
 920                         {
 921                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 922                         goto err;
 923                         }
 924                 p+=i;
 925                 n-=param_len;
 926
 927                 /* this should be because we are using an export cipher */
 928                 if (alg & SSL_aRSA)
 929                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 930                 else
 931                         {
 932                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
 933                         goto err;
 934                         }
 935                 s->session->sess_cert->peer_rsa_tmp=rsa;
 936                 rsa=NULL;
 937                 }
 938         else
 939 #endif
 940 #ifndef NO_DH
 941                 if (alg & SSL_kEDH)
 942                 {
 943                 if ((dh=DH_new()) == NULL)
 944                         {
 945                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
 946                         goto err;
 947                         }
 948                 n2s(p,i);
 949                 param_len=i+2;
 950                 if (param_len > n)
 951                         {
 952                         al=SSL_AD_DECODE_ERROR;
 953                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
 954                         goto f_err;
 955                         }
 956                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
 957                         {
 958                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 959                         goto err;
 960                         }
 961                 p+=i;
 962
 963                 n2s(p,i);
 964                 param_len+=i+2;
 965                 if (param_len > n)
 966                         {
 967                         al=SSL_AD_DECODE_ERROR;
 968                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
 969                         goto f_err;
 970                         }
 971                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
 972                         {
 973                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 974                         goto err;
 975                         }
 976                 p+=i;
 977
 978                 n2s(p,i);
 979                 param_len+=i+2;
 980                 if (param_len > n)
 981                         {
 982                         al=SSL_AD_DECODE_ERROR;
 983                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
 984                         goto f_err;
 985                         }
 986                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
 987                         {
 988                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 989                         goto err;
 990                         }
 991                 p+=i;
 992                 n-=param_len;
 993
 994 #ifndef NO_RSA
 995                 if (alg & SSL_aRSA)
 996                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 997                 else
 998 #endif
 999 #ifndef NO_DSA
1000                 if (alg & SSL_aDSS)
1001                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1002 #endif
1003                 /* else anonymous DH, so no certificate or pkey. */
1004
1005                 s->session->sess_cert->peer_dh_tmp=dh;
1006                 dh=NULL;
1007                 }
1008         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1009                 {
1010                 al=SSL_AD_ILLEGAL_PARAMETER;
1011                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1012                 goto f_err;
1013                 }
1014 #endif
1015         if (alg & SSL_aFZA)
1016                 {
1017                 al=SSL_AD_HANDSHAKE_FAILURE;
1018                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1019                 goto f_err;
1020                 }
1021
1022
1023         /* p points to the next byte, there are 'n' bytes left */
1024
1025
1026         /* if it was signed, check the signature */
1027         if (pkey != NULL)
1028                 {
1029                 n2s(p,i);
1030                 n-=2;
1031                 j=EVP_PKEY_size(pkey);
1032
1033                 if ((i != n) || (n > j) || (n <= 0))
1034                         {
1035                         /* wrong packet length */
1036                         al=SSL_AD_DECODE_ERROR;
1037                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1038                         goto f_err;
1039                         }
1040
1041 #ifndef NO_RSA
1042                 if (pkey->type == EVP_PKEY_RSA)
1043                         {
1044                         int num;
1045
1046                         j=0;
1047                         q=md_buf;
1048                         for (num=2; num > 0; num--)
1049                                 {
1050                                 EVP_DigestInit(&md_ctx,(num == 2)
1051                                         ?s->ctx->md5:s->ctx->sha1);
1052                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1053                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1054                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1055                                 EVP_DigestFinal(&md_ctx,q,(unsigned int *)&i);
1056                                 q+=i;
1057                                 j+=i;
1058                                 }
1059                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1060                                                                 pkey->pkey.rsa);
1061                         if (i < 0)
1062                                 {
1063                                 al=SSL_AD_DECRYPT_ERROR;
1064                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1065                                 goto f_err;
1066                                 }
1067                         if (i == 0)
1068                                 {
1069                                 /* bad signature */
1070                                 al=SSL_AD_DECRYPT_ERROR;
1071                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1072                                 goto f_err;
1073                                 }
1074                         }
1075                 else
1076 #endif
1077 #ifndef NO_DSA
1078                         if (pkey->type == EVP_PKEY_DSA)
1079                         {
1080                         /* lets do DSS */
1081                         EVP_VerifyInit(&md_ctx,EVP_dss1());
1082                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1083                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1084                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1085                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1086                                 {
1087                                 /* bad signature */
1088                                 al=SSL_AD_DECRYPT_ERROR;
1089                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1090                                 goto f_err;
1091                                 }
1092                         }
1093                 else
1094 #endif
1095                         {
1096                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1097                         goto err;
1098                         }
1099                 }
1100         else
1101                 {
1102                 /* still data left over */
1103                 if (!(alg & SSL_aNULL))
1104                         {
1105                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1106                         goto err;
1107                         }
1108                 if (n != 0)
1109                         {
1110                         al=SSL_AD_DECODE_ERROR;
1111                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1112                         goto f_err;
1113                         }
1114                 }
1115         EVP_PKEY_free(pkey);
1116         return(1);
1117 f_err:
1118         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1119 err:
1120         EVP_PKEY_free(pkey);
1121 #ifndef NO_RSA
1122         if (rsa != NULL)
1123                 RSA_free(rsa);
1124 #endif
1125 #ifndef NO_DH
1126         if (dh != NULL)
1127                 DH_free(dh);
1128 #endif
1129         return(-1);
1130         }
1131
1132 static int ssl3_get_certificate_request(SSL *s)
1133         {
1134         int ok,ret=0;
1135         unsigned long n,nc,l;
1136         unsigned int llen,ctype_num,i;
1137         X509_NAME *xn=NULL;
1138         unsigned char *p,*d,*q;
1139         STACK_OF(X509_NAME) *ca_sk=NULL;
1140
1141         n=ssl3_get_message(s,
1142                 SSL3_ST_CR_CERT_REQ_A,
1143                 SSL3_ST_CR_CERT_REQ_B,
1144                 -1,
1145 #if defined(MSDOS) && !defined(WIN32)
1146                 1024*30,  /* 30k max cert list :-) */
1147 #else
1148                 1024*100, /* 100k max cert list :-) */
1149 #endif
1150                 &ok);
1151
1152         if (!ok) return((int)n);
1153
1154         s->s3->tmp.cert_req=0;
1155
1156         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1157                 {
1158                 s->s3->tmp.reuse_message=1;
1159                 return(1);
1160                 }
1161
1162         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1163                 {
1164                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1165                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1166                 goto err;
1167                 }
1168
1169         /* TLS does not like anon-DH with client cert */
1170         if (s->version > SSL3_VERSION)
1171                 {
1172                 l=s->s3->tmp.new_cipher->algorithms;
1173                 if (l & SSL_aNULL)
1174                         {
1175                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1176                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1177                         goto err;
1178                         }
1179                 }
1180
1181         d=p=(unsigned char *)s->init_buf->data;
1182
1183         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1184                 {
1185                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1186                 goto err;
1187                 }
1188
1189         /* get the certificate types */
1190         ctype_num= *(p++);
1191         if (ctype_num > SSL3_CT_NUMBER)
1192                 ctype_num=SSL3_CT_NUMBER;
1193         for (i=0; i<ctype_num; i++)
1194                 s->s3->tmp.ctype[i]= p[i];
1195         p+=ctype_num;
1196
1197         /* get the CA RDNs */
1198         n2s(p,llen);
1199 #if 0
1200 {
1201 FILE *out;
1202 out=fopen("/tmp/vsign.der","w");
1203 fwrite(p,1,llen,out);
1204 fclose(out);
1205 }
1206 #endif
1207
1208         if ((llen+ctype_num+2+1) != n)
1209                 {
1210                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1211                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1212                 goto err;
1213                 }
1214
1215         for (nc=0; nc<llen; )
1216                 {
1217                 n2s(p,l);
1218                 if ((l+nc+2) > llen)
1219                         {
1220                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1221                                 goto cont; /* netscape bugs */
1222                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1223                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1224                         goto err;
1225                         }
1226
1227                 q=p;
1228
1229                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1230                         {
1231                         /* If netscape tolerance is on, ignore errors */
1232                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1233                                 goto cont;
1234                         else
1235                                 {
1236                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1237                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1238                                 goto err;
1239                                 }
1240                         }
1241
1242                 if (q != (p+l))
1243                         {
1244                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1245                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1246                         goto err;
1247                         }
1248                 if (!sk_X509_NAME_push(ca_sk,xn))
1249                         {
1250                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1251                         goto err;
1252                         }
1253
1254                 p+=l;
1255                 nc+=l+2;
1256                 }
1257
1258         if (0)
1259                 {
1260 cont:
1261                 ERR_clear_error();
1262                 }
1263
1264         /* we should setup a certificate to return.... */
1265         s->s3->tmp.cert_req=1;
1266         s->s3->tmp.ctype_num=ctype_num;
1267         if (s->s3->tmp.ca_names != NULL)
1268                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1269         s->s3->tmp.ca_names=ca_sk;
1270         ca_sk=NULL;
1271
1272         ret=1;
1273 err:
1274         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1275         return(ret);
1276         }
1277
1278 static int ca_dn_cmp(X509_NAME **a, X509_NAME **b)
1279         {
1280         return(X509_NAME_cmp(*a,*b));
1281         }
1282
1283 static int ssl3_get_server_done(SSL *s)
1284         {
1285         int ok,ret=0;
1286         long n;
1287
1288         n=ssl3_get_message(s,
1289                 SSL3_ST_CR_SRVR_DONE_A,
1290                 SSL3_ST_CR_SRVR_DONE_B,
1291                 SSL3_MT_SERVER_DONE,
1292                 30, /* should be very small, like 0 :-) */
1293                 &ok);
1294
1295         if (!ok) return((int)n);
1296         if (n > 0)
1297                 {
1298                 /* should contain no data */
1299                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1300                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1301                 }
1302         ret=1;
1303         return(ret);
1304         }
1305
1306 static int ssl3_send_client_key_exchange(SSL *s)
1307         {
1308         unsigned char *p,*d;
1309         int n;
1310         unsigned long l;
1311 #ifndef NO_RSA
1312         unsigned char *q;
1313         EVP_PKEY *pkey=NULL;
1314 #endif
1315
1316         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1317                 {
1318                 d=(unsigned char *)s->init_buf->data;
1319                 p= &(d[4]);
1320
1321                 l=s->s3->tmp.new_cipher->algorithms;
1322
1323 #ifndef NO_RSA
1324                 if (l & SSL_kRSA)
1325                         {
1326                         RSA *rsa;
1327                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1328
1329                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1330                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1331                         else
1332                                 {
1333                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1334                                 if ((pkey == NULL) ||
1335                                         (pkey->type != EVP_PKEY_RSA) ||
1336                                         (pkey->pkey.rsa == NULL))
1337                                         {
1338                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1339                                         goto err;
1340                                         }
1341                                 rsa=pkey->pkey.rsa;
1342                                 EVP_PKEY_free(pkey);
1343                                 }
1344
1345                         tmp_buf[0]=s->client_version>>8;
1346                         tmp_buf[1]=s->client_version&0xff;
1347                         if (RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2) <= 0)
1348                                         goto err;
1349
1350                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1351
1352                         q=p;
1353                         /* Fix buf for TLS and beyond */
1354                         if (s->version > SSL3_VERSION)
1355                                 p+=2;
1356                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1357                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1358 #ifdef PKCS1_CHECK
1359                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1360                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1361 #endif
1362                         if (n <= 0)
1363                                 {
1364                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1365                                 goto err;
1366                                 }
1367
1368                         /* Fix buf for TLS and beyond */
1369                         if (s->version > SSL3_VERSION)
1370                                 {
1371                                 s2n(n,q);
1372                                 n+=2;
1373                                 }
1374
1375                         s->session->master_key_length=
1376                                 s->method->ssl3_enc->generate_master_secret(s,
1377                                         s->session->master_key,
1378                                         tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1379                         memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1380                         }
1381                 else
1382 #endif
1383 #ifndef NO_DH
1384                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1385                         {
1386                         DH *dh_srvr,*dh_clnt;
1387
1388                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1389                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1390                         else
1391                                 {
1392                                 /* we get them from the cert */
1393                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1394                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1395                                 goto err;
1396                                 }
1397
1398                         /* generate a new random key */
1399                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1400                                 {
1401                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1402                                 goto err;
1403                                 }
1404                         if (!DH_generate_key(dh_clnt))
1405                                 {
1406                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1407                                 goto err;
1408                                 }
1409
1410                         /* use the 'p' output buffer for the DH key, but
1411                          * make sure to clear it out afterwards */
1412
1413                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1414
1415                         if (n <= 0)
1416                                 {
1417                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1418                                 goto err;
1419                                 }
1420
1421                         /* generate master key from the result */
1422                         s->session->master_key_length=
1423                                 s->method->ssl3_enc->generate_master_secret(s,
1424                                         s->session->master_key,p,n);
1425                         /* clean up */
1426                         memset(p,0,n);
1427
1428                         /* send off the data */
1429                         n=BN_num_bytes(dh_clnt->pub_key);
1430                         s2n(n,p);
1431                         BN_bn2bin(dh_clnt->pub_key,p);
1432                         n+=2;
1433
1434                         DH_free(dh_clnt);
1435
1436                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1437                         }
1438                 else
1439 #endif
1440                         {
1441                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1442                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1443                         goto err;
1444                         }
1445
1446                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1447                 l2n3(n,d);
1448
1449                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1450                 /* number of bytes to write */
1451                 s->init_num=n+4;
1452                 s->init_off=0;
1453                 }
1454
1455         /* SSL3_ST_CW_KEY_EXCH_B */
1456         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1457 err:
1458         return(-1);
1459         }
1460
1461 static int ssl3_send_client_verify(SSL *s)
1462         {
1463         unsigned char *p,*d;
1464         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1465         EVP_PKEY *pkey;
1466 #ifndef NO_RSA
1467         unsigned u=0;
1468 #endif
1469         unsigned long n;
1470 #ifndef NO_DSA
1471         int j;
1472 #endif
1473
1474         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1475                 {
1476                 d=(unsigned char *)s->init_buf->data;
1477                 p= &(d[4]);
1478                 pkey=s->cert->key->privatekey;
1479
1480                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1481                         &(data[MD5_DIGEST_LENGTH]));
1482
1483 #ifndef NO_RSA
1484                 if (pkey->type == EVP_PKEY_RSA)
1485                         {
1486                         s->method->ssl3_enc->cert_verify_mac(s,
1487                                 &(s->s3->finish_dgst1),&(data[0]));
1488                         if (RSA_sign(NID_md5_sha1, data,
1489                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1490                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1491                                 {
1492                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1493                                 goto err;
1494                                 }
1495                         s2n(u,p);
1496                         n=u+2;
1497                         }
1498                 else
1499 #endif
1500 #ifndef NO_DSA
1501                         if (pkey->type == EVP_PKEY_DSA)
1502                         {
1503                         if (!DSA_sign(pkey->save_type,
1504                                 &(data[MD5_DIGEST_LENGTH]),
1505                                 SHA_DIGEST_LENGTH,&(p[2]),
1506                                 (unsigned int *)&j,pkey->pkey.dsa))
1507                                 {
1508                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1509                                 goto err;
1510                                 }
1511                         s2n(j,p);
1512                         n=j+2;
1513                         }
1514                 else
1515 #endif
1516                         {
1517                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,SSL_R_INTERNAL_ERROR);
1518                         goto err;
1519                         }
1520                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1521                 l2n3(n,d);
1522
1523                 s->init_num=(int)n+4;
1524                 s->init_off=0;
1525                 }
1526         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1527 err:
1528         return(-1);
1529         }
1530
1531 static int ssl3_send_client_certificate(SSL *s)
1532         {
1533         X509 *x509=NULL;
1534         EVP_PKEY *pkey=NULL;
1535         int i;
1536         unsigned long l;
1537
1538         if (s->state == SSL3_ST_CW_CERT_A)
1539                 {
1540                 if ((s->cert == NULL) ||
1541                         (s->cert->key->x509 == NULL) ||
1542                         (s->cert->key->privatekey == NULL))
1543                         s->state=SSL3_ST_CW_CERT_B;
1544                 else
1545                         s->state=SSL3_ST_CW_CERT_C;
1546                 }
1547
1548         /* We need to get a client cert */
1549         if (s->state == SSL3_ST_CW_CERT_B)
1550                 {
1551                 /* If we get an error, we need to
1552                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1553                  * We then get retied later */
1554                 i=0;
1555                 if (s->ctx->client_cert_cb != NULL)
1556                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1557                 if (i < 0)
1558                         {
1559                         s->rwstate=SSL_X509_LOOKUP;
1560                         return(-1);
1561                         }
1562                 s->rwstate=SSL_NOTHING;
1563                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1564                         {
1565                         s->state=SSL3_ST_CW_CERT_B;
1566                         if (    !SSL_use_certificate(s,x509) ||
1567                                 !SSL_use_PrivateKey(s,pkey))
1568                                 i=0;
1569                         }
1570                 else if (i == 1)
1571                         {
1572                         i=0;
1573                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1574                         }
1575
1576                 if (x509 != NULL) X509_free(x509);
1577                 if (pkey != NULL) EVP_PKEY_free(pkey);
1578                 if (i == 0)
1579                         {
1580                         if (s->version == SSL3_VERSION)
1581                                 {
1582                                 s->s3->tmp.cert_req=0;
1583                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1584                                 return(1);
1585                                 }
1586                         else
1587                                 {
1588                                 s->s3->tmp.cert_req=2;
1589                                 }
1590                         }
1591
1592                 /* Ok, we have a cert */
1593                 s->state=SSL3_ST_CW_CERT_C;
1594                 }
1595
1596         if (s->state == SSL3_ST_CW_CERT_C)
1597                 {
1598                 s->state=SSL3_ST_CW_CERT_D;
1599                 l=ssl3_output_cert_chain(s,
1600                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1601                 s->init_num=(int)l;
1602                 s->init_off=0;
1603                 }
1604         /* SSL3_ST_CW_CERT_D */
1605         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1606         }
1607
1608 #define has_bits(i,m)   (((i)&(m)) == (m))
1609
1610 static int ssl3_check_cert_and_algorithm(SSL *s)
1611         {
1612         int i,idx;
1613         long algs;
1614         EVP_PKEY *pkey=NULL;
1615         SESS_CERT *sc;
1616 #ifndef NO_RSA
1617         RSA *rsa;
1618 #endif
1619 #ifndef NO_DH
1620         DH *dh;
1621 #endif
1622
1623         sc=s->session->sess_cert;
1624
1625         if (sc == NULL)
1626                 {
1627                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_INTERNAL_ERROR);
1628                 goto err;
1629                 }
1630
1631         algs=s->s3->tmp.new_cipher->algorithms;
1632
1633         /* we don't have a certificate */
1634         if (algs & (SSL_aDH|SSL_aNULL))
1635                 return(1);
1636
1637 #ifndef NO_RSA
1638         rsa=s->session->sess_cert->peer_rsa_tmp;
1639 #endif
1640 #ifndef NO_DH
1641         dh=s->session->sess_cert->peer_dh_tmp;
1642 #endif
1643
1644         /* This is the passed certificate */
1645
1646         idx=sc->peer_cert_type;
1647         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1648         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1649         EVP_PKEY_free(pkey);
1650
1651
1652         /* Check that we have a certificate if we require one */
1653         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1654                 {
1655                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1656                 goto f_err;
1657                 }
1658 #ifndef NO_DSA
1659         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1660                 {
1661                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1662                 goto f_err;
1663                 }
1664 #endif
1665 #ifndef NO_RSA
1666         if ((algs & SSL_kRSA) &&
1667                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1668                 {
1669                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1670                 goto f_err;
1671                 }
1672 #endif
1673 #ifndef NO_DH
1674         if ((algs & SSL_kEDH) &&
1675                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1676                 {
1677                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1678                 goto f_err;
1679                 }
1680         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1681                 {
1682                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1683                 goto f_err;
1684                 }
1685 #ifndef NO_DSA
1686         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1687                 {
1688                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1689                 goto f_err;
1690                 }
1691 #endif
1692 #endif
1693
1694         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
1695                 {
1696 #ifndef NO_RSA
1697                 if (algs & SSL_kRSA)
1698                         {
1699                         if (rsa == NULL
1700                             || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1701                                 {
1702                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1703                                 goto f_err;
1704                                 }
1705                         }
1706                 else
1707 #endif
1708 #ifndef NO_DH
1709                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1710                             {
1711                             if (dh == NULL
1712                                 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1713                                 {
1714                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1715                                 goto f_err;
1716                                 }
1717                         }
1718                 else
1719 #endif
1720                         {
1721                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1722                         goto f_err;
1723                         }
1724                 }
1725         return(1);
1726 f_err:
1727         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1728 err:
1729         return(0);
1730         }
1731