ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "buffer.h"
  61 #include "rand.h"
  62 #include "objects.h"
  63 #include "evp.h"
  64 #include "ssl_locl.h"
  65
  66 #define BREAK break
  67 /* SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
  68  * SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
  69  * SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
  70  * SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
  71  * SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
  72  * SSLerr(SSL_F_SSL3_GET_SERVER_DONE,ERR_R_MALLOC_FAILURE);
  73 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
  74  */
  75
  76 #ifndef NOPROTO
  77 static SSL_METHOD *ssl3_get_client_method(int ver);
  78 static int ssl3_client_hello(SSL *s);
  79 static int ssl3_get_server_hello(SSL *s);
  80 static int ssl3_get_certificate_request(SSL *s);
  81 static int ca_dn_cmp(X509_NAME **a,X509_NAME **b);
  82 static int ssl3_get_server_done(SSL *s);
  83 static int ssl3_send_client_verify(SSL *s);
  84 static int ssl3_send_client_certificate(SSL *s);
  85 static int ssl3_send_client_key_exchange(SSL *s);
  86 static int ssl3_get_key_exchange(SSL *s);
  87 static int ssl3_get_server_certificate(SSL *s);
  88 static int ssl3_check_cert_and_algorithm(SSL *s);
  89 #else
  90 static SSL_METHOD *ssl3_get_client_method();
  91 static int ssl3_client_hello();
  92 static int ssl3_get_server_hello();
  93 static int ssl3_get_certificate_request();
  94 static int ca_dn_cmp();
  95 static int ssl3_get_server_done();
  96 static int ssl3_send_client_verify();
  97 static int ssl3_send_client_certificate();
  98 static int ssl3_send_client_key_exchange();
  99 static int ssl3_get_key_exchange();
 100 static int ssl3_get_server_certificate();
 101 static int ssl3_check_cert_and_algorithm();
 102 #endif
 103
 104 static SSL_METHOD *ssl3_get_client_method(ver)
 105 int ver;
 106         {
 107         if (ver == SSL3_VERSION)
 108                 return(SSLv3_client_method());
 109         else
 110                 return(NULL);
 111         }
 112
 113 SSL_METHOD *SSLv3_client_method()
 114         {
 115         static int init=1;
 116         static SSL_METHOD SSLv3_client_data;
 117
 118         if (init)
 119                 {
 120                 init=0;
 121                 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
 122                         sizeof(SSL_METHOD));
 123                 SSLv3_client_data.ssl_connect=ssl3_connect;
 124                 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
 125                 }
 126         return(&SSLv3_client_data);
 127         }
 128
 129 int ssl3_connect(s)
 130 SSL *s;
 131         {
 132         BUF_MEM *buf;
 133         unsigned long Time=time(NULL),l;
 134         long num1;
 135         void (*cb)()=NULL;
 136         int ret= -1;
 137         int new_state,state,skip=0;;
 138
 139         RAND_seed(&Time,sizeof(Time));
 140         ERR_clear_error();
 141         clear_sys_error();
 142
 143         if (s->info_callback != NULL)
 144                 cb=s->info_callback;
 145         else if (s->ctx->info_callback != NULL)
 146                 cb=s->ctx->info_callback;
 147
 148         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 149         s->in_handshake++;
 150
 151         for (;;)
 152                 {
 153                 state=s->state;
 154
 155                 switch(s->state)
 156                         {
 157                 case SSL_ST_RENEGOTIATE:
 158                         s->new_session=1;
 159                         s->state=SSL_ST_CONNECT;
 160                         s->ctx->stats.sess_connect_renegotiate++;
 161                         /* break */
 162                 case SSL_ST_BEFORE:
 163                 case SSL_ST_CONNECT:
 164                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 165                 case SSL_ST_OK|SSL_ST_CONNECT:
 166
 167                         s->server=0;
 168                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 169
 170                         if ((s->version & 0xff00 ) != 0x0300)
 171                                 abort();
 172                         /* s->version=SSL3_VERSION; */
 173                         s->type=SSL_ST_CONNECT;
 174
 175                         if (s->init_buf == NULL)
 176                                 {
 177                                 if ((buf=BUF_MEM_new()) == NULL)
 178                                         {
 179                                         ret= -1;
 180                                         goto end;
 181                                         }
 182                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 183                                         {
 184                                         ret= -1;
 185                                         goto end;
 186                                         }
 187                                 s->init_buf=buf;
 188                                 }
 189
 190                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 191
 192                         /* setup buffing BIO */
 193                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 194
 195                         /* don't push the buffering BIO quite yet */
 196
 197                         ssl3_init_finished_mac(s);
 198
 199                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 200                         s->ctx->stats.sess_connect++;
 201                         s->init_num=0;
 202                         break;
 203
 204                 case SSL3_ST_CW_CLNT_HELLO_A:
 205                 case SSL3_ST_CW_CLNT_HELLO_B:
 206
 207                         s->shutdown=0;
 208                         ret=ssl3_client_hello(s);
 209                         if (ret <= 0) goto end;
 210                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 211                         s->init_num=0;
 212
 213                         /* turn on buffering for the next lot of output */
 214                         if (s->bbio != s->wbio)
 215                                 s->wbio=BIO_push(s->bbio,s->wbio);
 216
 217                         break;
 218
 219                 case SSL3_ST_CR_SRVR_HELLO_A:
 220                 case SSL3_ST_CR_SRVR_HELLO_B:
 221                         ret=ssl3_get_server_hello(s);
 222                         if (ret <= 0) goto end;
 223                         if (s->hit)
 224                                 s->state=SSL3_ST_CR_FINISHED_A;
 225                         else
 226                                 s->state=SSL3_ST_CR_CERT_A;
 227                         s->init_num=0;
 228                         break;
 229
 230                 case SSL3_ST_CR_CERT_A:
 231                 case SSL3_ST_CR_CERT_B:
 232                         /* Check if it is anon DH */
 233                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 234                                 {
 235                                 ret=ssl3_get_server_certificate(s);
 236                                 if (ret <= 0) goto end;
 237                                 }
 238                         else
 239                                 skip=1;
 240                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 241                         s->init_num=0;
 242                         break;
 243
 244                 case SSL3_ST_CR_KEY_EXCH_A:
 245                 case SSL3_ST_CR_KEY_EXCH_B:
 246                         ret=ssl3_get_key_exchange(s);
 247                         if (ret <= 0) goto end;
 248                         s->state=SSL3_ST_CR_CERT_REQ_A;
 249                         s->init_num=0;
 250
 251                         /* at this point we check that we have the
 252                          * required stuff from the server */
 253                         if (!ssl3_check_cert_and_algorithm(s))
 254                                 {
 255                                 ret= -1;
 256                                 goto end;
 257                                 }
 258                         break;
 259
 260                 case SSL3_ST_CR_CERT_REQ_A:
 261                 case SSL3_ST_CR_CERT_REQ_B:
 262                         ret=ssl3_get_certificate_request(s);
 263                         if (ret <= 0) goto end;
 264                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 265                         s->init_num=0;
 266                         break;
 267
 268                 case SSL3_ST_CR_SRVR_DONE_A:
 269                 case SSL3_ST_CR_SRVR_DONE_B:
 270                         ret=ssl3_get_server_done(s);
 271                         if (ret <= 0) goto end;
 272                         if (s->s3->tmp.cert_req)
 273                                 s->state=SSL3_ST_CW_CERT_A;
 274                         else
 275                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 276                         s->init_num=0;
 277
 278                         break;
 279
 280                 case SSL3_ST_CW_CERT_A:
 281                 case SSL3_ST_CW_CERT_B:
 282                 case SSL3_ST_CW_CERT_C:
 283                         ret=ssl3_send_client_certificate(s);
 284                         if (ret <= 0) goto end;
 285                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 286                         s->init_num=0;
 287                         break;
 288
 289                 case SSL3_ST_CW_KEY_EXCH_A:
 290                 case SSL3_ST_CW_KEY_EXCH_B:
 291                         ret=ssl3_send_client_key_exchange(s);
 292                         if (ret <= 0) goto end;
 293                         l=s->s3->tmp.new_cipher->algorithms;
 294                         /* EAY EAY EAY need to check for DH fix cert
 295                          * sent back */
 296                         /* For TLS, cert_req is set to 2, so a cert chain
 297                          * of nothing is sent, but no verify packet is sent */
 298                         if (s->s3->tmp.cert_req == 1)
 299                                 {
 300                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 301                                 }
 302                         else
 303                                 {
 304                                 s->state=SSL3_ST_CW_CHANGE_A;
 305                                 s->s3->change_cipher_spec=0;
 306                                 }
 307
 308                         s->init_num=0;
 309                         break;
 310
 311                 case SSL3_ST_CW_CERT_VRFY_A:
 312                 case SSL3_ST_CW_CERT_VRFY_B:
 313                         ret=ssl3_send_client_verify(s);
 314                         if (ret <= 0) goto end;
 315                         s->state=SSL3_ST_CW_CHANGE_A;
 316                         s->init_num=0;
 317                         s->s3->change_cipher_spec=0;
 318                         break;
 319
 320                 case SSL3_ST_CW_CHANGE_A:
 321                 case SSL3_ST_CW_CHANGE_B:
 322                         ret=ssl3_send_change_cipher_spec(s,
 323                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 324                         if (ret <= 0) goto end;
 325                         s->state=SSL3_ST_CW_FINISHED_A;
 326                         s->init_num=0;
 327
 328                         s->session->cipher=s->s3->tmp.new_cipher;
 329                         if (s->s3->tmp.new_compression == NULL)
 330                                 s->session->compress_meth=0;
 331                         else
 332                                 s->session->compress_meth=
 333                                         s->s3->tmp.new_compression->id;
 334                         if (!s->method->ssl3_enc->setup_key_block(s))
 335                                 {
 336                                 ret= -1;
 337                                 goto end;
 338                                 }
 339
 340                         if (!s->method->ssl3_enc->change_cipher_state(s,
 341                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 342                                 {
 343                                 ret= -1;
 344                                 goto end;
 345                                 }
 346
 347                         break;
 348
 349                 case SSL3_ST_CW_FINISHED_A:
 350                 case SSL3_ST_CW_FINISHED_B:
 351                         ret=ssl3_send_finished(s,
 352                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 353                                 s->method->ssl3_enc->client_finished,
 354                                 s->method->ssl3_enc->client_finished_len);
 355                         if (ret <= 0) goto end;
 356                         s->state=SSL3_ST_CW_FLUSH;
 357
 358                         /* clear flags */
 359                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 360                         if (s->hit)
 361                                 {
 362                                 s->s3->tmp.next_state=SSL_ST_OK;
 363                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 364                                         {
 365                                         s->state=SSL_ST_OK;
 366                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 367                                         s->s3->delay_buf_pop_ret=0;
 368                                         }
 369                                 }
 370                         else
 371                                 {
 372                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 373                                 }
 374                         s->init_num=0;
 375                         break;
 376
 377                 case SSL3_ST_CR_FINISHED_A:
 378                 case SSL3_ST_CR_FINISHED_B:
 379
 380                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 381                                 SSL3_ST_CR_FINISHED_B);
 382                         if (ret <= 0) goto end;
 383
 384                         if (s->hit)
 385                                 s->state=SSL3_ST_CW_CHANGE_A;
 386                         else
 387                                 s->state=SSL_ST_OK;
 388                         s->init_num=0;
 389                         break;
 390
 391                 case SSL3_ST_CW_FLUSH:
 392                         /* number of bytes to be flushed */
 393                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 394                         if (num1 > 0)
 395                                 {
 396                                 s->rwstate=SSL_WRITING;
 397                                 num1=BIO_flush(s->wbio);
 398                                 if (num1 <= 0) { ret= -1; goto end; }
 399                                 s->rwstate=SSL_NOTHING;
 400                                 }
 401
 402                         s->state=s->s3->tmp.next_state;
 403                         break;
 404
 405                 case SSL_ST_OK:
 406                         /* clean a few things up */
 407                         ssl3_cleanup_key_block(s);
 408
 409                         if (s->init_buf != NULL)
 410                                 {
 411                                 BUF_MEM_free(s->init_buf);
 412                                 s->init_buf=NULL;
 413                                 }
 414
 415                         /* If we are not 'joining' the last two packets,
 416                          * remove the buffering now */
 417                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 418                                 ssl_free_wbio_buffer(s);
 419                         /* else do it later in ssl3_write */
 420
 421                         s->init_num=0;
 422                         s->new_session=0;
 423
 424                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 425                         if (s->hit) s->ctx->stats.sess_hit++;
 426
 427                         ret=1;
 428                         /* s->server=0; */
 429                         s->handshake_func=ssl3_connect;
 430                         s->ctx->stats.sess_connect_good++;
 431
 432                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 433
 434                         goto end;
 435                         /* break; */
 436
 437                 default:
 438                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 439                         ret= -1;
 440                         goto end;
 441                         /* break; */
 442                         }
 443
 444                 /* did we do anything */
 445                 if (!s->s3->tmp.reuse_message && !skip)
 446                         {
 447                         if (s->debug)
 448                                 {
 449                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 450                                         goto end;
 451                                 }
 452
 453                         if ((cb != NULL) && (s->state != state))
 454                                 {
 455                                 new_state=s->state;
 456                                 s->state=state;
 457                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 458                                 s->state=new_state;
 459                                 }
 460                         }
 461                 skip=0;
 462                 }
 463 end:
 464         if (cb != NULL)
 465                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 466         s->in_handshake--;
 467         return(ret);
 468         }
 469
 470
 471 static int ssl3_client_hello(s)
 472 SSL *s;
 473         {
 474         unsigned char *buf;
 475         unsigned char *p,*d;
 476         int i,j;
 477         unsigned long Time,l;
 478         SSL_COMP *comp;
 479
 480         buf=(unsigned char *)s->init_buf->data;
 481         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 482                 {
 483                 if ((s->session == NULL) ||
 484                         (s->session->ssl_version != s->version) ||
 485                         (s->session->not_resumable))
 486                         {
 487                         if (!ssl_get_new_session(s,0))
 488                                 goto err;
 489                         }
 490                 /* else use the pre-loaded session */
 491
 492                 p=s->s3->client_random;
 493                 Time=time(NULL);                        /* Time */
 494                 l2n(Time,p);
 495                 RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 496
 497                 /* Do the message type and length last */
 498                 d=p= &(buf[4]);
 499
 500                 *(p++)=s->version>>8;
 501                 *(p++)=s->version&0xff;
 502                 s->client_version=s->version;
 503
 504                 /* Random stuff */
 505                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 506                 p+=SSL3_RANDOM_SIZE;
 507
 508                 /* Session ID */
 509                 if (s->new_session)
 510                         i=0;
 511                 else
 512                         i=s->session->session_id_length;
 513                 *(p++)=i;
 514                 if (i != 0)
 515                         {
 516                         memcpy(p,s->session->session_id,i);
 517                         p+=i;
 518                         }
 519
 520                 /* Ciphers supported */
 521                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 522                 if (i == 0)
 523                         {
 524                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 525                         goto err;
 526                         }
 527                 s2n(i,p);
 528                 p+=i;
 529
 530                 /* COMPRESSION */
 531                 if (s->ctx->comp_methods == NULL)
 532                         j=0;
 533                 else
 534                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 535                 *(p++)=1+j;
 536                 for (i=0; i<j; i++)
 537                         {
 538                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 539                         *(p++)=comp->id;
 540                         }
 541                 *(p++)=0; /* Add the NULL method */
 542
 543                 l=(p-d);
 544                 d=buf;
 545                 *(d++)=SSL3_MT_CLIENT_HELLO;
 546                 l2n3(l,d);
 547
 548                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 549                 /* number of bytes to write */
 550                 s->init_num=p-buf;
 551                 s->init_off=0;
 552                 }
 553
 554         /* SSL3_ST_CW_CLNT_HELLO_B */
 555         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 556 err:
 557         return(-1);
 558         }
 559
 560 static int ssl3_get_server_hello(s)
 561 SSL *s;
 562         {
 563         STACK_OF(SSL_CIPHER) *sk;
 564         SSL_CIPHER *c;
 565         unsigned char *p,*d;
 566         int i,al,ok;
 567         unsigned int j;
 568         long n;
 569         SSL_COMP *comp;
 570
 571         n=ssl3_get_message(s,
 572                 SSL3_ST_CR_SRVR_HELLO_A,
 573                 SSL3_ST_CR_SRVR_HELLO_B,
 574                 SSL3_MT_SERVER_HELLO,
 575                 300, /* ?? */
 576                 &ok);
 577
 578         if (!ok) return((int)n);
 579         d=p=(unsigned char *)s->init_buf->data;
 580
 581         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 582                 {
 583                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 584                 s->version=(s->version&0xff00)|p[1];
 585                 al=SSL_AD_PROTOCOL_VERSION;
 586                 goto f_err;
 587                 }
 588         p+=2;
 589
 590         /* load the server hello data */
 591         /* load the server random */
 592         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 593         p+=SSL3_RANDOM_SIZE;
 594
 595         /* get the session-id */
 596         j= *(p++);
 597
 598         if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
 599                 {
 600                 /* SSLref returns 16 :-( */
 601                 if (j < SSL2_SSL_SESSION_ID_LENGTH)
 602                         {
 603                         al=SSL_AD_ILLEGAL_PARAMETER;
 604                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
 605                         goto f_err;
 606                         }
 607                 }
 608         if (j != 0 && j == s->session->session_id_length
 609             && memcmp(p,s->session->session_id,j) == 0)
 610             {
 611             if(s->sid_ctx_length != s->session->sid_ctx_length
 612                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 613                 {
 614                 al=SSL_AD_ILLEGAL_PARAMETER;
 615                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 616                 goto f_err;
 617                 }
 618             s->hit=1;
 619             }
 620         else    /* a miss or crap from the other end */
 621                 {
 622                 /* If we were trying for session-id reuse, make a new
 623                  * SSL_SESSION so we don't stuff up other people */
 624                 s->hit=0;
 625                 if (s->session->session_id_length > 0)
 626                         {
 627                         if (!ssl_get_new_session(s,0))
 628                                 {
 629                                 al=SSL_AD_INTERNAL_ERROR;
 630                                 goto f_err;
 631                                 }
 632                         }
 633                 s->session->session_id_length=j;
 634                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 635                 }
 636         p+=j;
 637         c=ssl_get_cipher_by_char(s,p);
 638         if (c == NULL)
 639                 {
 640                 /* unknown cipher */
 641                 al=SSL_AD_ILLEGAL_PARAMETER;
 642                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 643                 goto f_err;
 644                 }
 645         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 646
 647         sk=ssl_get_ciphers_by_id(s);
 648         i=sk_SSL_CIPHER_find(sk,c);
 649         if (i < 0)
 650                 {
 651                 /* we did not say we would use this cipher */
 652                 al=SSL_AD_ILLEGAL_PARAMETER;
 653                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 654                 goto f_err;
 655                 }
 656
 657         if (s->hit && (s->session->cipher != c))
 658                 {
 659                 if (!(s->options &
 660                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 661                         {
 662                         al=SSL_AD_ILLEGAL_PARAMETER;
 663                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 664                         goto f_err;
 665                         }
 666                 }
 667         s->s3->tmp.new_cipher=c;
 668
 669         /* lets get the compression algorithm */
 670         /* COMPRESSION */
 671         j= *(p++);
 672         if (j == 0)
 673                 comp=NULL;
 674         else
 675                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 676
 677         if ((j != 0) && (comp == NULL))
 678                 {
 679                 al=SSL_AD_ILLEGAL_PARAMETER;
 680                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 681                 goto f_err;
 682                 }
 683         else
 684                 {
 685                 s->s3->tmp.new_compression=comp;
 686                 }
 687
 688         if (p != (d+n))
 689                 {
 690                 /* wrong packet length */
 691                 al=SSL_AD_DECODE_ERROR;
 692                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 693                 goto err;
 694                 }
 695
 696         return(1);
 697 f_err:
 698         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 699 err:
 700         return(-1);
 701         }
 702
 703 static int ssl3_get_server_certificate(s)
 704 SSL *s;
 705         {
 706         int al,i,ok,ret= -1;
 707         unsigned long n,nc,llen,l;
 708         X509 *x=NULL;
 709         unsigned char *p,*d,*q;
 710         STACK_OF(X509) *sk=NULL;
 711         CERT *c;
 712         EVP_PKEY *pkey=NULL;
 713
 714         n=ssl3_get_message(s,
 715                 SSL3_ST_CR_CERT_A,
 716                 SSL3_ST_CR_CERT_B,
 717                 -1,
 718 #if defined(MSDOS) && !defined(WIN32)
 719                 1024*30, /* 30k max cert list :-) */
 720 #else
 721                 1024*100, /* 100k max cert list :-) */
 722 #endif
 723                 &ok);
 724
 725         if (!ok) return((int)n);
 726
 727         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 728                 {
 729                 s->s3->tmp.reuse_message=1;
 730                 return(1);
 731                 }
 732
 733         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 734                 {
 735                 al=SSL_AD_UNEXPECTED_MESSAGE;
 736                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 737                 goto f_err;
 738                 }
 739         d=p=(unsigned char *)s->init_buf->data;
 740
 741         if ((sk=sk_X509_new_null()) == NULL)
 742                 {
 743                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 744                 goto err;
 745                 }
 746
 747         n2l3(p,llen);
 748         if (llen+3 != n)
 749                 {
 750                 al=SSL_AD_DECODE_ERROR;
 751                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 752                 goto f_err;
 753                 }
 754         for (nc=0; nc<llen; )
 755                 {
 756                 n2l3(p,l);
 757                 if ((l+nc+3) > llen)
 758                         {
 759                         al=SSL_AD_DECODE_ERROR;
 760                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 761                         goto f_err;
 762                         }
 763
 764                 q=p;
 765                 x=d2i_X509(NULL,&q,l);
 766                 if (x == NULL)
 767                         {
 768                         al=SSL_AD_BAD_CERTIFICATE;
 769                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 770                         goto f_err;
 771                         }
 772                 if (q != (p+l))
 773                         {
 774                         al=SSL_AD_DECODE_ERROR;
 775                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 776                         goto f_err;
 777                         }
 778                 if (!sk_X509_push(sk,x))
 779                         {
 780                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 781                         goto err;
 782                         }
 783                 x=NULL;
 784                 nc+=l+3;
 785                 p=q;
 786                 }
 787
 788         i=ssl_verify_cert_chain(s,sk);
 789         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 790                 {
 791                 al=ssl_verify_alarm_type(s->verify_result);
 792                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 793                 goto f_err;
 794                 }
 795
 796         c=ssl_cert_new();
 797         if (c == NULL) goto err;
 798
 799         if (s->session->cert) ssl_cert_free(s->session->cert);
 800         s->session->cert=c;
 801
 802         c->cert_chain=sk;
 803         x=sk_X509_value(sk,0);
 804         sk=NULL;
 805
 806         pkey=X509_get_pubkey(x);
 807
 808         if ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))
 809                 {
 810                 x=NULL;
 811                 al=SSL3_AL_FATAL;
 812                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 813                 goto f_err;
 814                 }
 815
 816         i=ssl_cert_type(x,pkey);
 817         if (i < 0)
 818                 {
 819                 x=NULL;
 820                 al=SSL3_AL_FATAL;
 821                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 822                 goto f_err;
 823                 }
 824
 825         c->cert_type=i;
 826         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 827         if (c->pkeys[i].x509 != NULL)
 828                 X509_free(c->pkeys[i].x509);
 829         c->pkeys[i].x509=x;
 830         c->key= &(c->pkeys[i]);
 831
 832         if ((s->session != NULL) && (s->session->peer != NULL))
 833                 X509_free(s->session->peer);
 834         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 835         s->session->peer=x;
 836
 837         x=NULL;
 838         ret=1;
 839
 840         if (0)
 841                 {
 842 f_err:
 843                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 844                 }
 845 err:
 846         EVP_PKEY_free(pkey);
 847         X509_free(x);
 848         sk_X509_pop_free(sk,X509_free);
 849         return(ret);
 850         }
 851
 852 static int ssl3_get_key_exchange(s)
 853 SSL *s;
 854         {
 855 #ifndef NO_RSA
 856         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 857 #endif
 858         EVP_MD_CTX md_ctx;
 859         unsigned char *param,*p;
 860         int al,i,j,param_len,ok;
 861         long n,alg;
 862         EVP_PKEY *pkey=NULL;
 863         RSA *rsa=NULL;
 864 #ifndef NO_DH
 865         DH *dh=NULL;
 866 #endif
 867
 868         n=ssl3_get_message(s,
 869                 SSL3_ST_CR_KEY_EXCH_A,
 870                 SSL3_ST_CR_KEY_EXCH_B,
 871                 -1,
 872                 1024*8, /* ?? */
 873                 &ok);
 874
 875         if (!ok) return((int)n);
 876
 877         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 878                 {
 879                 s->s3->tmp.reuse_message=1;
 880                 return(1);
 881                 }
 882
 883         param=p=(unsigned char *)s->init_buf->data;
 884
 885         if (s->session->cert != NULL)
 886                 {
 887 #ifndef NO_RSA
 888                 if (s->session->cert->rsa_tmp != NULL)
 889                         {
 890                         RSA_free(s->session->cert->rsa_tmp);
 891                         s->session->cert->rsa_tmp=NULL;
 892                         }
 893 #endif
 894 #ifndef NO_DH
 895                 if (s->session->cert->dh_tmp)
 896                         {
 897                         DH_free(s->session->cert->dh_tmp);
 898                         s->session->cert->dh_tmp=NULL;
 899                         }
 900 #endif
 901                 }
 902         else
 903                 {
 904                 s->session->cert=ssl_cert_new();
 905                 }
 906
 907         param_len=0;
 908         alg=s->s3->tmp.new_cipher->algorithms;
 909
 910 #ifndef NO_RSA
 911         if (alg & SSL_kRSA)
 912                 {
 913                 if ((rsa=RSA_new()) == NULL)
 914                         {
 915                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 916                         goto err;
 917                         }
 918                 n2s(p,i);
 919                 param_len=i+2;
 920                 if (param_len > n)
 921                         {
 922                         al=SSL_AD_DECODE_ERROR;
 923                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
 924                         goto f_err;
 925                         }
 926                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
 927                         {
 928                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 929                         goto err;
 930                         }
 931                 p+=i;
 932
 933                 n2s(p,i);
 934                 param_len+=i+2;
 935                 if (param_len > n)
 936                         {
 937                         al=SSL_AD_DECODE_ERROR;
 938                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
 939                         goto f_err;
 940                         }
 941                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
 942                         {
 943                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 944                         goto err;
 945                         }
 946                 p+=i;
 947                 n-=param_len;
 948
 949 /*              s->session->cert->rsa_tmp=rsa;*/
 950                 /* this should be because we are using an export cipher */
 951                 if (alg & SSL_aRSA)
 952                         pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509);
 953                 else
 954                         {
 955                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
 956                         goto err;
 957                         }
 958                 s->session->cert->rsa_tmp=rsa;
 959                 }
 960         else
 961 #endif
 962 #ifndef NO_DH
 963                 if (alg & SSL_kEDH)
 964                 {
 965                 if ((dh=DH_new()) == NULL)
 966                         {
 967                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
 968                         goto err;
 969                         }
 970                 n2s(p,i);
 971                 param_len=i+2;
 972                 if (param_len > n)
 973                         {
 974                         al=SSL_AD_DECODE_ERROR;
 975                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
 976                         goto f_err;
 977                         }
 978                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
 979                         {
 980                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 981                         goto err;
 982                         }
 983                 p+=i;
 984
 985                 n2s(p,i);
 986                 param_len+=i+2;
 987                 if (param_len > n)
 988                         {
 989                         al=SSL_AD_DECODE_ERROR;
 990                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
 991                         goto f_err;
 992                         }
 993                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
 994                         {
 995                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 996                         goto err;
 997                         }
 998                 p+=i;
 999
1000                 n2s(p,i);
1001                 param_len+=i+2;
1002                 if (param_len > n)
1003                         {
1004                         al=SSL_AD_DECODE_ERROR;
1005                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1006                         goto f_err;
1007                         }
1008                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1009                         {
1010                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1011                         goto err;
1012                         }
1013                 p+=i;
1014                 n-=param_len;
1015
1016 #ifndef NO_RSA
1017                 if (alg & SSL_aRSA)
1018                         pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509);
1019                 else
1020 #endif
1021 #ifndef NO_DSA
1022                 if (alg & SSL_aDSS)
1023                         pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_DSA_SIGN].x509);
1024 #endif
1025                 /* else anonymous DH, so no certificate or pkey. */
1026
1027                 s->session->cert->dh_tmp=dh;
1028                 dh=NULL;
1029                 }
1030         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1031                 {
1032                 al=SSL_AD_ILLEGAL_PARAMETER;
1033                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1034                 goto f_err;
1035                 }
1036 #endif
1037         if (alg & SSL_aFZA)
1038                 {
1039                 al=SSL_AD_HANDSHAKE_FAILURE;
1040                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1041                 goto f_err;
1042                 }
1043
1044
1045         /* p points to the next byte, there are 'n' bytes left */
1046
1047
1048         /* if it was signed, check the signature */
1049         if (pkey != NULL)
1050                 {
1051                 n2s(p,i);
1052                 n-=2;
1053                 j=EVP_PKEY_size(pkey);
1054
1055                 if ((i != n) || (n > j) || (n <= 0))
1056                         {
1057                         /* wrong packet length */
1058                         al=SSL_AD_DECODE_ERROR;
1059                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1060                         goto f_err;
1061                         }
1062
1063 #ifndef NO_RSA
1064                 if (pkey->type == EVP_PKEY_RSA)
1065                         {
1066                         int num;
1067
1068                         j=0;
1069                         q=md_buf;
1070                         for (num=2; num > 0; num--)
1071                                 {
1072                                 EVP_DigestInit(&md_ctx,(num == 2)
1073                                         ?s->ctx->md5:s->ctx->sha1);
1074                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1075                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1076                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1077                                 EVP_DigestFinal(&md_ctx,q,(unsigned int *)&i);
1078                                 q+=i;
1079                                 j+=i;
1080                                 }
1081                         i=RSA_public_decrypt((int)n,p,p,pkey->pkey.rsa,
1082                                 RSA_PKCS1_PADDING);
1083                         if (i <= 0)
1084                                 {
1085                                 al=SSL_AD_DECRYPT_ERROR;
1086                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1087                                 goto f_err;
1088                                 }
1089                         if ((j != i) || (memcmp(p,md_buf,i) != 0))
1090                                 {
1091                                 /* bad signature */
1092                                 al=SSL_AD_DECRYPT_ERROR;
1093                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1094                                 goto f_err;
1095                                 }
1096                         }
1097                 else
1098 #endif
1099 #ifndef NO_DSA
1100                         if (pkey->type == EVP_PKEY_DSA)
1101                         {
1102                         /* lets do DSS */
1103                         EVP_VerifyInit(&md_ctx,EVP_dss1());
1104                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1105                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1106                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1107                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1108                                 {
1109                                 /* bad signature */
1110                                 al=SSL_AD_DECRYPT_ERROR;
1111                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1112                                 goto f_err;
1113                                 }
1114                         }
1115                 else
1116 #endif
1117                         {
1118                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1119                         goto err;
1120                         }
1121                 }
1122         else
1123                 {
1124                 /* still data left over */
1125                 if (!(alg & SSL_aNULL))
1126                         {
1127                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1128                         goto err;
1129                         }
1130                 if (n != 0)
1131                         {
1132                         al=SSL_AD_DECODE_ERROR;
1133                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1134                         goto f_err;
1135                         }
1136                 }
1137         EVP_PKEY_free(pkey);
1138         return(1);
1139 f_err:
1140         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1141 err:
1142         EVP_PKEY_free(pkey);
1143         return(-1);
1144         }
1145
1146 static int ssl3_get_certificate_request(s)
1147 SSL *s;
1148         {
1149         int ok,ret=0;
1150         unsigned long n,nc,l;
1151         unsigned int llen,ctype_num,i;
1152         X509_NAME *xn=NULL;
1153         unsigned char *p,*d,*q;
1154         STACK_OF(X509_NAME) *ca_sk=NULL;
1155
1156         n=ssl3_get_message(s,
1157                 SSL3_ST_CR_CERT_REQ_A,
1158                 SSL3_ST_CR_CERT_REQ_B,
1159                 -1,
1160 #if defined(MSDOS) && !defined(WIN32)
1161                 1024*30,  /* 30k max cert list :-) */
1162 #else
1163                 1024*100, /* 100k max cert list :-) */
1164 #endif
1165                 &ok);
1166
1167         if (!ok) return((int)n);
1168
1169         s->s3->tmp.cert_req=0;
1170
1171         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1172                 {
1173                 s->s3->tmp.reuse_message=1;
1174                 return(1);
1175                 }
1176
1177         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1178                 {
1179                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1180                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1181                 goto err;
1182                 }
1183
1184         /* TLS does not like anon-DH with client cert */
1185         if (s->version > SSL3_VERSION)
1186                 {
1187                 l=s->s3->tmp.new_cipher->algorithms;
1188                 if (l & SSL_aNULL)
1189                         {
1190                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1191                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1192                         goto err;
1193                         }
1194                 }
1195
1196         d=p=(unsigned char *)s->init_buf->data;
1197
1198         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1199                 {
1200                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1201                 goto err;
1202                 }
1203
1204         /* get the certificate types */
1205         ctype_num= *(p++);
1206         if (ctype_num > SSL3_CT_NUMBER)
1207                 ctype_num=SSL3_CT_NUMBER;
1208         for (i=0; i<ctype_num; i++)
1209                 s->s3->tmp.ctype[i]= p[i];
1210         p+=ctype_num;
1211
1212         /* get the CA RDNs */
1213         n2s(p,llen);
1214 #if 0
1215 {
1216 FILE *out;
1217 out=fopen("/tmp/vsign.der","w");
1218 fwrite(p,1,llen,out);
1219 fclose(out);
1220 }
1221 #endif
1222
1223         if ((llen+ctype_num+2+1) != n)
1224                 {
1225                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1226                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1227                 goto err;
1228                 }
1229
1230         for (nc=0; nc<llen; )
1231                 {
1232                 n2s(p,l);
1233                 if ((l+nc+2) > llen)
1234                         {
1235                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1236                                 goto cont; /* netscape bugs */
1237                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1238                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1239                         goto err;
1240                         }
1241
1242                 q=p;
1243
1244                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1245                         {
1246                         /* If netscape tollerance is on, ignore errors */
1247                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1248                                 goto cont;
1249                         else
1250                                 {
1251                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1252                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1253                                 goto err;
1254                                 }
1255                         }
1256
1257                 if (q != (p+l))
1258                         {
1259                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1260                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1261                         goto err;
1262                         }
1263                 if (!sk_X509_NAME_push(ca_sk,xn))
1264                         {
1265                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1266                         goto err;
1267                         }
1268
1269                 p+=l;
1270                 nc+=l+2;
1271                 }
1272
1273         if (0)
1274                 {
1275 cont:
1276                 ERR_clear_error();
1277                 }
1278
1279         /* we should setup a certficate to return.... */
1280         s->s3->tmp.cert_req=1;
1281         s->s3->tmp.ctype_num=ctype_num;
1282         if (s->s3->tmp.ca_names != NULL)
1283                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1284         s->s3->tmp.ca_names=ca_sk;
1285         ca_sk=NULL;
1286
1287         ret=1;
1288 err:
1289         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1290         return(ret);
1291         }
1292
1293 static int ca_dn_cmp(a,b)
1294 X509_NAME **a,**b;
1295         {
1296         return(X509_NAME_cmp(*a,*b));
1297         }
1298
1299 static int ssl3_get_server_done(s)
1300 SSL *s;
1301         {
1302         int ok,ret=0;
1303         long n;
1304
1305         n=ssl3_get_message(s,
1306                 SSL3_ST_CR_SRVR_DONE_A,
1307                 SSL3_ST_CR_SRVR_DONE_B,
1308                 SSL3_MT_SERVER_DONE,
1309                 30, /* should be very small, like 0 :-) */
1310                 &ok);
1311
1312         if (!ok) return((int)n);
1313         if (n > 0)
1314                 {
1315                 /* should contain no data */
1316                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1317                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1318                 }
1319         ret=1;
1320         return(ret);
1321         }
1322
1323 static int ssl3_send_client_key_exchange(s)
1324 SSL *s;
1325         {
1326         unsigned char *p,*q,*d;
1327         int n;
1328         unsigned long l;
1329         EVP_PKEY *pkey=NULL;
1330
1331         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1332                 {
1333                 d=(unsigned char *)s->init_buf->data;
1334                 p= &(d[4]);
1335
1336                 l=s->s3->tmp.new_cipher->algorithms;
1337
1338 #ifndef NO_RSA
1339                 if (l & SSL_kRSA)
1340                         {
1341                         RSA *rsa;
1342                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1343
1344                         if (s->session->cert->rsa_tmp != NULL)
1345                                 rsa=s->session->cert->rsa_tmp;
1346                         else
1347                                 {
1348                                 pkey=X509_get_pubkey(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509);
1349                                 if ((pkey == NULL) ||
1350                                         (pkey->type != EVP_PKEY_RSA) ||
1351                                         (pkey->pkey.rsa == NULL))
1352                                         {
1353                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1354                                         goto err;
1355                                         }
1356                                 rsa=pkey->pkey.rsa;
1357                                 }
1358
1359                         tmp_buf[0]=s->client_version>>8;
1360                         tmp_buf[1]=s->client_version&0xff;
1361                         RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
1362
1363                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1364
1365                         q=p;
1366                         /* Fix buf for TLS and beyond */
1367                         if (s->version > SSL3_VERSION)
1368                                 p+=2;
1369                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1370                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1371 #ifdef PKCS1_CHECK
1372                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1373                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1374 #endif
1375                         if (n <= 0)
1376                                 {
1377                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1378                                 goto err;
1379                                 }
1380
1381                         /* Fix buf for TLS and beyond */
1382                         if (s->version > SSL3_VERSION)
1383                                 {
1384                                 s2n(n,q);
1385                                 n+=2;
1386                                 }
1387
1388                         s->session->master_key_length=
1389                                 s->method->ssl3_enc->generate_master_secret(s,
1390                                         s->session->master_key,
1391                                         tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1392                         memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1393                         }
1394                 else
1395 #endif
1396 #ifndef NO_DH
1397                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1398                         {
1399                         DH *dh_srvr,*dh_clnt;
1400
1401                         if (s->session->cert->dh_tmp != NULL)
1402                                 dh_srvr=s->session->cert->dh_tmp;
1403                         else
1404                                 {
1405                                 /* we get them from the cert */
1406                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1407                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1408                                 goto err;
1409                                 }
1410
1411                         /* generate a new random key */
1412                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1413                                 {
1414                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1415                                 goto err;
1416                                 }
1417                         if (!DH_generate_key(dh_clnt))
1418                                 {
1419                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1420                                 goto err;
1421                                 }
1422
1423                         /* use the 'p' output buffer for the DH key, but
1424                          * make sure to clear it out afterwards */
1425
1426                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1427
1428                         if (n <= 0)
1429                                 {
1430                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1431                                 goto err;
1432                                 }
1433
1434                         /* generate master key from the result */
1435                         s->session->master_key_length=
1436                                 s->method->ssl3_enc->generate_master_secret(s,
1437                                         s->session->master_key,p,n);
1438                         /* clean up */
1439                         memset(p,0,n);
1440
1441                         /* send off the data */
1442                         n=BN_num_bytes(dh_clnt->pub_key);
1443                         s2n(n,p);
1444                         BN_bn2bin(dh_clnt->pub_key,p);
1445                         n+=2;
1446
1447                         DH_free(dh_clnt);
1448
1449                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1450                         }
1451                 else
1452 #endif
1453                         {
1454                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1455                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1456                         goto err;
1457                         }
1458
1459                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1460                 l2n3(n,d);
1461
1462                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1463                 /* number of bytes to write */
1464                 s->init_num=n+4;
1465                 s->init_off=0;
1466                 }
1467
1468         /* SSL3_ST_CW_KEY_EXCH_B */
1469         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1470 err:
1471         return(-1);
1472         }
1473
1474 static int ssl3_send_client_verify(s)
1475 SSL *s;
1476         {
1477         unsigned char *p,*d;
1478         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1479         EVP_PKEY *pkey;
1480         int i=0;
1481         unsigned long n;
1482 #ifndef NO_DSA
1483         int j;
1484 #endif
1485
1486         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1487                 {
1488                 d=(unsigned char *)s->init_buf->data;
1489                 p= &(d[4]);
1490                 pkey=s->cert->key->privatekey;
1491
1492                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1493                         &(data[MD5_DIGEST_LENGTH]));
1494
1495 #ifndef NO_RSA
1496                 if (pkey->type == EVP_PKEY_RSA)
1497                         {
1498                         s->method->ssl3_enc->cert_verify_mac(s,
1499                                 &(s->s3->finish_dgst1),&(data[0]));
1500                         i=RSA_private_encrypt(
1501                                 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1502                                 data,&(p[2]),pkey->pkey.rsa,
1503                                 RSA_PKCS1_PADDING);
1504                         if (i <= 0)
1505                                 {
1506                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1507                                 goto err;
1508                                 }
1509                         s2n(i,p);
1510                         n=i+2;
1511                         }
1512                 else
1513 #endif
1514 #ifndef NO_DSA
1515                         if (pkey->type == EVP_PKEY_DSA)
1516                         {
1517                         if (!DSA_sign(pkey->save_type,
1518                                 &(data[MD5_DIGEST_LENGTH]),
1519                                 SHA_DIGEST_LENGTH,&(p[2]),
1520                                 (unsigned int *)&j,pkey->pkey.dsa))
1521                                 {
1522                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1523                                 goto err;
1524                                 }
1525                         s2n(j,p);
1526                         n=j+2;
1527                         }
1528                 else
1529 #endif
1530                         {
1531                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,SSL_R_INTERNAL_ERROR);
1532                         goto err;
1533                         }
1534                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1535                 l2n3(n,d);
1536
1537                 s->init_num=(int)n+4;
1538                 s->init_off=0;
1539                 }
1540         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1541 err:
1542         return(-1);
1543         }
1544
1545 static int ssl3_send_client_certificate(s)
1546 SSL *s;
1547         {
1548         X509 *x509=NULL;
1549         EVP_PKEY *pkey=NULL;
1550         int i;
1551         unsigned long l;
1552
1553         if (s->state == SSL3_ST_CW_CERT_A)
1554                 {
1555                 if ((s->cert == NULL) ||
1556                         (s->cert->key->x509 == NULL) ||
1557                         (s->cert->key->privatekey == NULL))
1558                         s->state=SSL3_ST_CW_CERT_B;
1559                 else
1560                         s->state=SSL3_ST_CW_CERT_C;
1561                 }
1562
1563         /* We need to get a client cert */
1564         if (s->state == SSL3_ST_CW_CERT_B)
1565                 {
1566                 /* If we get an error, we need to
1567                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1568                  * We then get retied later */
1569                 i=0;
1570                 if (s->ctx->client_cert_cb != NULL)
1571                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1572                 if (i < 0)
1573                         {
1574                         s->rwstate=SSL_X509_LOOKUP;
1575                         return(-1);
1576                         }
1577                 s->rwstate=SSL_NOTHING;
1578                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1579                         {
1580                         s->state=SSL3_ST_CW_CERT_B;
1581                         if (    !SSL_use_certificate(s,x509) ||
1582                                 !SSL_use_PrivateKey(s,pkey))
1583                                 i=0;
1584                         }
1585                 else if (i == 1)
1586                         {
1587                         i=0;
1588                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1589                         }
1590
1591                 if (x509 != NULL) X509_free(x509);
1592                 if (pkey != NULL) EVP_PKEY_free(pkey);
1593                 if (i == 0)
1594                         {
1595                         if (s->version == SSL3_VERSION)
1596                                 {
1597                                 s->s3->tmp.cert_req=0;
1598                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1599                                 return(1);
1600                                 }
1601                         else
1602                                 {
1603                                 s->s3->tmp.cert_req=2;
1604                                 }
1605                         }
1606
1607                 /* Ok, we have a cert */
1608                 s->state=SSL3_ST_CW_CERT_C;
1609                 }
1610
1611         if (s->state == SSL3_ST_CW_CERT_C)
1612                 {
1613                 s->state=SSL3_ST_CW_CERT_D;
1614                 l=ssl3_output_cert_chain(s,
1615                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1616                 s->init_num=(int)l;
1617                 s->init_off=0;
1618                 }
1619         /* SSL3_ST_CW_CERT_D */
1620         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1621         }
1622
1623 #define has_bits(i,m)   (((i)&(m)) == (m))
1624
1625 static int ssl3_check_cert_and_algorithm(s)
1626 SSL *s;
1627         {
1628         int i,idx;
1629         long algs;
1630         EVP_PKEY *pkey=NULL;
1631         CERT *c;
1632         RSA *rsa;
1633         DH *dh;
1634
1635         c=s->session->cert;
1636
1637         if (c == NULL)
1638                 {
1639                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_INTERNAL_ERROR);
1640                 goto err;
1641                 }
1642
1643         algs=s->s3->tmp.new_cipher->algorithms;
1644
1645         /* we don't have a certificate */
1646         if (algs & (SSL_aDH|SSL_aNULL))
1647                 return(1);
1648
1649         rsa=s->session->cert->rsa_tmp;
1650         dh=s->session->cert->dh_tmp;
1651
1652         /* This is the passed certificate */
1653
1654         idx=c->cert_type;
1655         pkey=X509_get_pubkey(c->pkeys[idx].x509);
1656         i=X509_certificate_type(c->pkeys[idx].x509,pkey);
1657         EVP_PKEY_free(pkey);
1658
1659
1660         /* Check that we have a certificate if we require one */
1661         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1662                 {
1663                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1664                 goto f_err;
1665                 }
1666 #ifndef NO_DSA
1667         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1668                 {
1669                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1670                 goto f_err;
1671                 }
1672 #endif
1673
1674         if ((algs & SSL_kRSA) &&
1675                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1676                 {
1677                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1678                 goto f_err;
1679                 }
1680 #ifndef NO_DH
1681         else if ((algs & SSL_kEDH) &&
1682                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1683                 {
1684                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1685                 goto f_err;
1686                 }
1687         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1688                 {
1689                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1690                 goto f_err;
1691                 }
1692 #ifndef NO_DSA
1693         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1694                 {
1695                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1696                 goto f_err;
1697                 }
1698 #endif
1699 #endif
1700
1701         if (SSL_IS_EXPORT(algs) && !has_bits(i,EVP_PKT_EXP))
1702                 {
1703 #ifndef NO_RSA
1704                 if (algs & SSL_kRSA)
1705                         {
1706                         if (rsa == NULL
1707                             || RSA_size(rsa) > SSL_EXPORT_PKEYLENGTH(algs))
1708                                 {
1709                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1710                                 goto f_err;
1711                                 }
1712                         }
1713                 else
1714 #endif
1715 #ifndef NO_DH
1716                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1717                             {
1718                             if (dh == NULL
1719                                 || DH_size(dh) > SSL_EXPORT_PKEYLENGTH(algs))
1720                                 {
1721                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1722                                 goto f_err;
1723                                 }
1724                         }
1725                 else
1726 #endif
1727                         {
1728                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1729                         goto f_err;
1730                         }
1731                 }
1732         return(1);
1733 f_err:
1734         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1735 err:
1736         return(0);
1737         }
1738