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(const X509_NAME * const *a,const X509_NAME * const *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                                 {
 146                                 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_INTERNAL_ERROR);
 147                                 ret = -1;
 148                                 goto end;
 149                                 }
 150
 151                         /* s->version=SSL3_VERSION; */
 152                         s->type=SSL_ST_CONNECT;
 153
 154                         if (s->init_buf == NULL)
 155                                 {
 156                                 if ((buf=BUF_MEM_new()) == NULL)
 157                                         {
 158                                         ret= -1;
 159                                         goto end;
 160                                         }
 161                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 162                                         {
 163                                         ret= -1;
 164                                         goto end;
 165                                         }
 166                                 s->init_buf=buf;
 167                                 }
 168
 169                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 170
 171                         /* setup buffing BIO */
 172                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 173
 174                         /* don't push the buffering BIO quite yet */
 175
 176                         ssl3_init_finished_mac(s);
 177
 178                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 179                         s->ctx->stats.sess_connect++;
 180                         s->init_num=0;
 181                         break;
 182
 183                 case SSL3_ST_CW_CLNT_HELLO_A:
 184                 case SSL3_ST_CW_CLNT_HELLO_B:
 185
 186                         s->shutdown=0;
 187                         ret=ssl3_client_hello(s);
 188                         if (ret <= 0) goto end;
 189                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 190                         s->init_num=0;
 191
 192                         /* turn on buffering for the next lot of output */
 193                         if (s->bbio != s->wbio)
 194                                 s->wbio=BIO_push(s->bbio,s->wbio);
 195
 196                         break;
 197
 198                 case SSL3_ST_CR_SRVR_HELLO_A:
 199                 case SSL3_ST_CR_SRVR_HELLO_B:
 200                         ret=ssl3_get_server_hello(s);
 201                         if (ret <= 0) goto end;
 202                         if (s->hit)
 203                                 s->state=SSL3_ST_CR_FINISHED_A;
 204                         else
 205                                 s->state=SSL3_ST_CR_CERT_A;
 206                         s->init_num=0;
 207                         break;
 208
 209                 case SSL3_ST_CR_CERT_A:
 210                 case SSL3_ST_CR_CERT_B:
 211                         /* Check if it is anon DH */
 212                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 213                                 {
 214                                 ret=ssl3_get_server_certificate(s);
 215                                 if (ret <= 0) goto end;
 216                                 }
 217                         else
 218                                 skip=1;
 219                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 220                         s->init_num=0;
 221                         break;
 222
 223                 case SSL3_ST_CR_KEY_EXCH_A:
 224                 case SSL3_ST_CR_KEY_EXCH_B:
 225                         ret=ssl3_get_key_exchange(s);
 226                         if (ret <= 0) goto end;
 227                         s->state=SSL3_ST_CR_CERT_REQ_A;
 228                         s->init_num=0;
 229
 230                         /* at this point we check that we have the
 231                          * required stuff from the server */
 232                         if (!ssl3_check_cert_and_algorithm(s))
 233                                 {
 234                                 ret= -1;
 235                                 goto end;
 236                                 }
 237                         break;
 238
 239                 case SSL3_ST_CR_CERT_REQ_A:
 240                 case SSL3_ST_CR_CERT_REQ_B:
 241                         ret=ssl3_get_certificate_request(s);
 242                         if (ret <= 0) goto end;
 243                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 244                         s->init_num=0;
 245                         break;
 246
 247                 case SSL3_ST_CR_SRVR_DONE_A:
 248                 case SSL3_ST_CR_SRVR_DONE_B:
 249                         ret=ssl3_get_server_done(s);
 250                         if (ret <= 0) goto end;
 251                         if (s->s3->tmp.cert_req)
 252                                 s->state=SSL3_ST_CW_CERT_A;
 253                         else
 254                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 255                         s->init_num=0;
 256
 257                         break;
 258
 259                 case SSL3_ST_CW_CERT_A:
 260                 case SSL3_ST_CW_CERT_B:
 261                 case SSL3_ST_CW_CERT_C:
 262                 case SSL3_ST_CW_CERT_D:
 263                         ret=ssl3_send_client_certificate(s);
 264                         if (ret <= 0) goto end;
 265                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 266                         s->init_num=0;
 267                         break;
 268
 269                 case SSL3_ST_CW_KEY_EXCH_A:
 270                 case SSL3_ST_CW_KEY_EXCH_B:
 271                         ret=ssl3_send_client_key_exchange(s);
 272                         if (ret <= 0) goto end;
 273                         l=s->s3->tmp.new_cipher->algorithms;
 274                         /* EAY EAY EAY need to check for DH fix cert
 275                          * sent back */
 276                         /* For TLS, cert_req is set to 2, so a cert chain
 277                          * of nothing is sent, but no verify packet is sent */
 278                         if (s->s3->tmp.cert_req == 1)
 279                                 {
 280                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 281                                 }
 282                         else
 283                                 {
 284                                 s->state=SSL3_ST_CW_CHANGE_A;
 285                                 s->s3->change_cipher_spec=0;
 286                                 }
 287
 288                         s->init_num=0;
 289                         break;
 290
 291                 case SSL3_ST_CW_CERT_VRFY_A:
 292                 case SSL3_ST_CW_CERT_VRFY_B:
 293                         ret=ssl3_send_client_verify(s);
 294                         if (ret <= 0) goto end;
 295                         s->state=SSL3_ST_CW_CHANGE_A;
 296                         s->init_num=0;
 297                         s->s3->change_cipher_spec=0;
 298                         break;
 299
 300                 case SSL3_ST_CW_CHANGE_A:
 301                 case SSL3_ST_CW_CHANGE_B:
 302                         ret=ssl3_send_change_cipher_spec(s,
 303                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 304                         if (ret <= 0) goto end;
 305                         s->state=SSL3_ST_CW_FINISHED_A;
 306                         s->init_num=0;
 307
 308                         s->session->cipher=s->s3->tmp.new_cipher;
 309                         if (s->s3->tmp.new_compression == NULL)
 310                                 s->session->compress_meth=0;
 311                         else
 312                                 s->session->compress_meth=
 313                                         s->s3->tmp.new_compression->id;
 314                         if (!s->method->ssl3_enc->setup_key_block(s))
 315                                 {
 316                                 ret= -1;
 317                                 goto end;
 318                                 }
 319
 320                         if (!s->method->ssl3_enc->change_cipher_state(s,
 321                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 322                                 {
 323                                 ret= -1;
 324                                 goto end;
 325                                 }
 326
 327                         break;
 328
 329                 case SSL3_ST_CW_FINISHED_A:
 330                 case SSL3_ST_CW_FINISHED_B:
 331                         ret=ssl3_send_finished(s,
 332                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 333                                 s->method->ssl3_enc->client_finished_label,
 334                                 s->method->ssl3_enc->client_finished_label_len);
 335                         if (ret <= 0) goto end;
 336                         s->state=SSL3_ST_CW_FLUSH;
 337
 338                         /* clear flags */
 339                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 340                         if (s->hit)
 341                                 {
 342                                 s->s3->tmp.next_state=SSL_ST_OK;
 343                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 344                                         {
 345                                         s->state=SSL_ST_OK;
 346                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 347                                         s->s3->delay_buf_pop_ret=0;
 348                                         }
 349                                 }
 350                         else
 351                                 {
 352                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 353                                 }
 354                         s->init_num=0;
 355                         break;
 356
 357                 case SSL3_ST_CR_FINISHED_A:
 358                 case SSL3_ST_CR_FINISHED_B:
 359
 360                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 361                                 SSL3_ST_CR_FINISHED_B);
 362                         if (ret <= 0) goto end;
 363
 364                         if (s->hit)
 365                                 s->state=SSL3_ST_CW_CHANGE_A;
 366                         else
 367                                 s->state=SSL_ST_OK;
 368                         s->init_num=0;
 369                         break;
 370
 371                 case SSL3_ST_CW_FLUSH:
 372                         /* number of bytes to be flushed */
 373                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 374                         if (num1 > 0)
 375                                 {
 376                                 s->rwstate=SSL_WRITING;
 377                                 num1=BIO_flush(s->wbio);
 378                                 if (num1 <= 0) { ret= -1; goto end; }
 379                                 s->rwstate=SSL_NOTHING;
 380                                 }
 381
 382                         s->state=s->s3->tmp.next_state;
 383                         break;
 384
 385                 case SSL_ST_OK:
 386                         /* clean a few things up */
 387                         ssl3_cleanup_key_block(s);
 388
 389                         if (s->init_buf != NULL)
 390                                 {
 391                                 BUF_MEM_free(s->init_buf);
 392                                 s->init_buf=NULL;
 393                                 }
 394
 395                         /* If we are not 'joining' the last two packets,
 396                          * remove the buffering now */
 397                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 398                                 ssl_free_wbio_buffer(s);
 399                         /* else do it later in ssl3_write */
 400
 401                         s->init_num=0;
 402                         s->new_session=0;
 403
 404                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 405                         if (s->hit) s->ctx->stats.sess_hit++;
 406
 407                         ret=1;
 408                         /* s->server=0; */
 409                         s->handshake_func=ssl3_connect;
 410                         s->ctx->stats.sess_connect_good++;
 411
 412                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 413
 414                         goto end;
 415                         /* break; */
 416
 417                 default:
 418                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 419                         ret= -1;
 420                         goto end;
 421                         /* break; */
 422                         }
 423
 424                 /* did we do anything */
 425                 if (!s->s3->tmp.reuse_message && !skip)
 426                         {
 427                         if (s->debug)
 428                                 {
 429                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 430                                         goto end;
 431                                 }
 432
 433                         if ((cb != NULL) && (s->state != state))
 434                                 {
 435                                 new_state=s->state;
 436                                 s->state=state;
 437                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 438                                 s->state=new_state;
 439                                 }
 440                         }
 441                 skip=0;
 442                 }
 443 end:
 444         if (cb != NULL)
 445                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 446         s->in_handshake--;
 447         return(ret);
 448         }
 449
 450
 451 static int ssl3_client_hello(SSL *s)
 452         {
 453         unsigned char *buf;
 454         unsigned char *p,*d;
 455         int i,j;
 456         unsigned long Time,l;
 457         SSL_COMP *comp;
 458
 459         buf=(unsigned char *)s->init_buf->data;
 460         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 461                 {
 462                 if ((s->session == NULL) ||
 463                         (s->session->ssl_version != s->version) ||
 464                         (s->session->not_resumable))
 465                         {
 466                         if (!ssl_get_new_session(s,0))
 467                                 goto err;
 468                         }
 469                 /* else use the pre-loaded session */
 470
 471                 p=s->s3->client_random;
 472                 Time=time(NULL);                        /* Time */
 473                 l2n(Time,p);
 474                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 475
 476                 /* Do the message type and length last */
 477                 d=p= &(buf[4]);
 478
 479                 *(p++)=s->version>>8;
 480                 *(p++)=s->version&0xff;
 481                 s->client_version=s->version;
 482
 483                 /* Random stuff */
 484                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 485                 p+=SSL3_RANDOM_SIZE;
 486
 487                 /* Session ID */
 488                 if (s->new_session)
 489                         i=0;
 490                 else
 491                         i=s->session->session_id_length;
 492                 *(p++)=i;
 493                 if (i != 0)
 494                         {
 495                         memcpy(p,s->session->session_id,i);
 496                         p+=i;
 497                         }
 498
 499                 /* Ciphers supported */
 500                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
 501                 if (i == 0)
 502                         {
 503                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 504                         goto err;
 505                         }
 506                 s2n(i,p);
 507                 p+=i;
 508
 509                 /* COMPRESSION */
 510                 if (s->ctx->comp_methods == NULL)
 511                         j=0;
 512                 else
 513                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 514                 *(p++)=1+j;
 515                 for (i=0; i<j; i++)
 516                         {
 517                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 518                         *(p++)=comp->id;
 519                         }
 520                 *(p++)=0; /* Add the NULL method */
 521
 522                 l=(p-d);
 523                 d=buf;
 524                 *(d++)=SSL3_MT_CLIENT_HELLO;
 525                 l2n3(l,d);
 526
 527                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 528                 /* number of bytes to write */
 529                 s->init_num=p-buf;
 530                 s->init_off=0;
 531                 }
 532
 533         /* SSL3_ST_CW_CLNT_HELLO_B */
 534         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 535 err:
 536         return(-1);
 537         }
 538
 539 static int ssl3_get_server_hello(SSL *s)
 540         {
 541         STACK_OF(SSL_CIPHER) *sk;
 542         SSL_CIPHER *c;
 543         unsigned char *p,*d;
 544         int i,al,ok;
 545         unsigned int j;
 546         long n;
 547         SSL_COMP *comp;
 548
 549         n=ssl3_get_message(s,
 550                 SSL3_ST_CR_SRVR_HELLO_A,
 551                 SSL3_ST_CR_SRVR_HELLO_B,
 552                 SSL3_MT_SERVER_HELLO,
 553                 300, /* ?? */
 554                 &ok);
 555
 556         if (!ok) return((int)n);
 557         d=p=(unsigned char *)s->init_buf->data;
 558
 559         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 560                 {
 561                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 562                 s->version=(s->version&0xff00)|p[1];
 563                 al=SSL_AD_PROTOCOL_VERSION;
 564                 goto f_err;
 565                 }
 566         p+=2;
 567
 568         /* load the server hello data */
 569         /* load the server random */
 570         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 571         p+=SSL3_RANDOM_SIZE;
 572
 573         /* get the session-id */
 574         j= *(p++);
 575
 576         if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
 577                 {
 578                 /* SSLref returns 16 :-( */
 579                 if (j < SSL2_SSL_SESSION_ID_LENGTH)
 580                         {
 581                         al=SSL_AD_ILLEGAL_PARAMETER;
 582                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
 583                         goto f_err;
 584                         }
 585                 }
 586         if (j != 0 && j == s->session->session_id_length
 587             && memcmp(p,s->session->session_id,j) == 0)
 588             {
 589             if(s->sid_ctx_length != s->session->sid_ctx_length
 590                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 591                 {
 592                 al=SSL_AD_ILLEGAL_PARAMETER;
 593                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 594                 goto f_err;
 595                 }
 596             s->hit=1;
 597             }
 598         else    /* a miss or crap from the other end */
 599                 {
 600                 /* If we were trying for session-id reuse, make a new
 601                  * SSL_SESSION so we don't stuff up other people */
 602                 s->hit=0;
 603                 if (s->session->session_id_length > 0)
 604                         {
 605                         if (!ssl_get_new_session(s,0))
 606                                 {
 607                                 al=SSL_AD_INTERNAL_ERROR;
 608                                 goto f_err;
 609                                 }
 610                         }
 611                 s->session->session_id_length=j;
 612                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 613                 }
 614         p+=j;
 615         c=ssl_get_cipher_by_char(s,p);
 616         if (c == NULL)
 617                 {
 618                 /* unknown cipher */
 619                 al=SSL_AD_ILLEGAL_PARAMETER;
 620                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 621                 goto f_err;
 622                 }
 623         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 624
 625         sk=ssl_get_ciphers_by_id(s);
 626         i=sk_SSL_CIPHER_find(sk,c);
 627         if (i < 0)
 628                 {
 629                 /* we did not say we would use this cipher */
 630                 al=SSL_AD_ILLEGAL_PARAMETER;
 631                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 632                 goto f_err;
 633                 }
 634
 635         if (s->hit && (s->session->cipher != c))
 636                 {
 637                 if (!(s->options &
 638                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 639                         {
 640                         al=SSL_AD_ILLEGAL_PARAMETER;
 641                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 642                         goto f_err;
 643                         }
 644                 }
 645         s->s3->tmp.new_cipher=c;
 646
 647         /* lets get the compression algorithm */
 648         /* COMPRESSION */
 649         j= *(p++);
 650         if (j == 0)
 651                 comp=NULL;
 652         else
 653                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 654
 655         if ((j != 0) && (comp == NULL))
 656                 {
 657                 al=SSL_AD_ILLEGAL_PARAMETER;
 658                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 659                 goto f_err;
 660                 }
 661         else
 662                 {
 663                 s->s3->tmp.new_compression=comp;
 664                 }
 665
 666         if (p != (d+n))
 667                 {
 668                 /* wrong packet length */
 669                 al=SSL_AD_DECODE_ERROR;
 670                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 671                 goto err;
 672                 }
 673
 674         return(1);
 675 f_err:
 676         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 677 err:
 678         return(-1);
 679         }
 680
 681 static int ssl3_get_server_certificate(SSL *s)
 682         {
 683         int al,i,ok,ret= -1;
 684         unsigned long n,nc,llen,l;
 685         X509 *x=NULL;
 686         unsigned char *p,*d,*q;
 687         STACK_OF(X509) *sk=NULL;
 688         SESS_CERT *sc;
 689         EVP_PKEY *pkey=NULL;
 690
 691         n=ssl3_get_message(s,
 692                 SSL3_ST_CR_CERT_A,
 693                 SSL3_ST_CR_CERT_B,
 694                 -1,
 695 #if defined(MSDOS) && !defined(WIN32)
 696                 1024*30, /* 30k max cert list :-) */
 697 #else
 698                 1024*100, /* 100k max cert list :-) */
 699 #endif
 700                 &ok);
 701
 702         if (!ok) return((int)n);
 703
 704         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 705                 {
 706                 s->s3->tmp.reuse_message=1;
 707                 return(1);
 708                 }
 709
 710         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 711                 {
 712                 al=SSL_AD_UNEXPECTED_MESSAGE;
 713                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 714                 goto f_err;
 715                 }
 716         d=p=(unsigned char *)s->init_buf->data;
 717
 718         if ((sk=sk_X509_new_null()) == NULL)
 719                 {
 720                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 721                 goto err;
 722                 }
 723
 724         n2l3(p,llen);
 725         if (llen+3 != n)
 726                 {
 727                 al=SSL_AD_DECODE_ERROR;
 728                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 729                 goto f_err;
 730                 }
 731         for (nc=0; nc<llen; )
 732                 {
 733                 n2l3(p,l);
 734                 if ((l+nc+3) > llen)
 735                         {
 736                         al=SSL_AD_DECODE_ERROR;
 737                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 738                         goto f_err;
 739                         }
 740
 741                 q=p;
 742                 x=d2i_X509(NULL,&q,l);
 743                 if (x == NULL)
 744                         {
 745                         al=SSL_AD_BAD_CERTIFICATE;
 746                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 747                         goto f_err;
 748                         }
 749                 if (q != (p+l))
 750                         {
 751                         al=SSL_AD_DECODE_ERROR;
 752                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 753                         goto f_err;
 754                         }
 755                 if (!sk_X509_push(sk,x))
 756                         {
 757                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 758                         goto err;
 759                         }
 760                 x=NULL;
 761                 nc+=l+3;
 762                 p=q;
 763                 }
 764
 765         i=ssl_verify_cert_chain(s,sk);
 766         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
 767                 {
 768                 al=ssl_verify_alarm_type(s->verify_result);
 769                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 770                 goto f_err;
 771                 }
 772         ERR_clear_error(); /* but we keep s->verify_result */
 773
 774         sc=ssl_sess_cert_new();
 775         if (sc == NULL) goto err;
 776
 777         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
 778         s->session->sess_cert=sc;
 779
 780         sc->cert_chain=sk;
 781         /* Inconsistency alert: cert_chain does include the peer's
 782          * certificate, which we don't include in s3_srvr.c */
 783         x=sk_X509_value(sk,0);
 784         sk=NULL;
 785
 786         pkey=X509_get_pubkey(x);
 787
 788         if ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))
 789                 {
 790                 x=NULL;
 791                 al=SSL3_AL_FATAL;
 792                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
 793                 goto f_err;
 794                 }
 795
 796         i=ssl_cert_type(x,pkey);
 797         if (i < 0)
 798                 {
 799                 x=NULL;
 800                 al=SSL3_AL_FATAL;
 801                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
 802                 goto f_err;
 803                 }
 804
 805         sc->peer_cert_type=i;
 806         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 807         if (sc->peer_pkeys[i].x509 != NULL) /* Why would this ever happen?
 808                                                                                  * We just created sc a couple of
 809                                                                                  * lines ago. */
 810                 X509_free(sc->peer_pkeys[i].x509);
 811         sc->peer_pkeys[i].x509=x;
 812         sc->peer_key= &(sc->peer_pkeys[i]);
 813
 814         if (s->session->peer != NULL)
 815                 X509_free(s->session->peer);
 816         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
 817         s->session->peer=x;
 818
 819         x=NULL;
 820         ret=1;
 821
 822         if (0)
 823                 {
 824 f_err:
 825                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 826                 }
 827 err:
 828         EVP_PKEY_free(pkey);
 829         X509_free(x);
 830         sk_X509_pop_free(sk,X509_free);
 831         return(ret);
 832         }
 833
 834 static int ssl3_get_key_exchange(SSL *s)
 835         {
 836 #ifndef NO_RSA
 837         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
 838 #endif
 839         EVP_MD_CTX md_ctx;
 840         unsigned char *param,*p;
 841         int al,i,j,param_len,ok;
 842         long n,alg;
 843         EVP_PKEY *pkey=NULL;
 844 #ifndef NO_RSA
 845         RSA *rsa=NULL;
 846 #endif
 847 #ifndef NO_DH
 848         DH *dh=NULL;
 849 #endif
 850
 851         n=ssl3_get_message(s,
 852                 SSL3_ST_CR_KEY_EXCH_A,
 853                 SSL3_ST_CR_KEY_EXCH_B,
 854                 -1,
 855                 1024*8, /* ?? */
 856                 &ok);
 857
 858         if (!ok) return((int)n);
 859
 860         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
 861                 {
 862                 s->s3->tmp.reuse_message=1;
 863                 return(1);
 864                 }
 865
 866         param=p=(unsigned char *)s->init_buf->data;
 867
 868         if (s->session->sess_cert != NULL)
 869                 {
 870 #ifndef NO_RSA
 871                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
 872                         {
 873                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
 874                         s->session->sess_cert->peer_rsa_tmp=NULL;
 875                         }
 876 #endif
 877 #ifndef NO_DH
 878                 if (s->session->sess_cert->peer_dh_tmp)
 879                         {
 880                         DH_free(s->session->sess_cert->peer_dh_tmp);
 881                         s->session->sess_cert->peer_dh_tmp=NULL;
 882                         }
 883 #endif
 884                 }
 885         else
 886                 {
 887                 s->session->sess_cert=ssl_sess_cert_new();
 888                 }
 889
 890         param_len=0;
 891         alg=s->s3->tmp.new_cipher->algorithms;
 892
 893 #ifndef NO_RSA
 894         if (alg & SSL_kRSA)
 895                 {
 896                 if ((rsa=RSA_new()) == NULL)
 897                         {
 898                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 899                         goto err;
 900                         }
 901                 n2s(p,i);
 902                 param_len=i+2;
 903                 if (param_len > n)
 904                         {
 905                         al=SSL_AD_DECODE_ERROR;
 906                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
 907                         goto f_err;
 908                         }
 909                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
 910                         {
 911                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 912                         goto err;
 913                         }
 914                 p+=i;
 915
 916                 n2s(p,i);
 917                 param_len+=i+2;
 918                 if (param_len > n)
 919                         {
 920                         al=SSL_AD_DECODE_ERROR;
 921                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
 922                         goto f_err;
 923                         }
 924                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
 925                         {
 926                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 927                         goto err;
 928                         }
 929                 p+=i;
 930                 n-=param_len;
 931
 932                 /* this should be because we are using an export cipher */
 933                 if (alg & SSL_aRSA)
 934                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 935                 else
 936                         {
 937                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
 938                         goto err;
 939                         }
 940                 s->session->sess_cert->peer_rsa_tmp=rsa;
 941                 rsa=NULL;
 942                 }
 943 #else /* NO_RSA */
 944         if (0)
 945                 ;
 946 #endif
 947 #ifndef NO_DH
 948         else if (alg & SSL_kEDH)
 949                 {
 950                 if ((dh=DH_new()) == NULL)
 951                         {
 952                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
 953                         goto err;
 954                         }
 955                 n2s(p,i);
 956                 param_len=i+2;
 957                 if (param_len > n)
 958                         {
 959                         al=SSL_AD_DECODE_ERROR;
 960                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
 961                         goto f_err;
 962                         }
 963                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
 964                         {
 965                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
 966                         goto err;
 967                         }
 968                 p+=i;
 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_G_LENGTH);
 976                         goto f_err;
 977                         }
 978                 if (!(dh->g=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_PUB_KEY_LENGTH);
 991                         goto f_err;
 992                         }
 993                 if (!(dh->pub_key=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                 n-=param_len;
1000
1001 #ifndef NO_RSA
1002                 if (alg & SSL_aRSA)
1003                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1004 #else
1005                 if (0)
1006                         ;
1007 #endif
1008 #ifndef NO_DSA
1009                 else if (alg & SSL_aDSS)
1010                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1011 #endif
1012                 /* else anonymous DH, so no certificate or pkey. */
1013
1014                 s->session->sess_cert->peer_dh_tmp=dh;
1015                 dh=NULL;
1016                 }
1017         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1018                 {
1019                 al=SSL_AD_ILLEGAL_PARAMETER;
1020                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1021                 goto f_err;
1022                 }
1023 #endif /* !NO_DH */
1024         if (alg & SSL_aFZA)
1025                 {
1026                 al=SSL_AD_HANDSHAKE_FAILURE;
1027                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1028                 goto f_err;
1029                 }
1030
1031
1032         /* p points to the next byte, there are 'n' bytes left */
1033
1034
1035         /* if it was signed, check the signature */
1036         if (pkey != NULL)
1037                 {
1038                 n2s(p,i);
1039                 n-=2;
1040                 j=EVP_PKEY_size(pkey);
1041
1042                 if ((i != n) || (n > j) || (n <= 0))
1043                         {
1044                         /* wrong packet length */
1045                         al=SSL_AD_DECODE_ERROR;
1046                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1047                         goto f_err;
1048                         }
1049
1050 #ifndef NO_RSA
1051                 if (pkey->type == EVP_PKEY_RSA)
1052                         {
1053                         int num;
1054
1055                         j=0;
1056                         q=md_buf;
1057                         for (num=2; num > 0; num--)
1058                                 {
1059                                 EVP_DigestInit(&md_ctx,(num == 2)
1060                                         ?s->ctx->md5:s->ctx->sha1);
1061                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1062                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1063                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1064                                 EVP_DigestFinal(&md_ctx,q,(unsigned int *)&i);
1065                                 q+=i;
1066                                 j+=i;
1067                                 }
1068                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1069                                                                 pkey->pkey.rsa);
1070                         if (i < 0)
1071                                 {
1072                                 al=SSL_AD_DECRYPT_ERROR;
1073                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1074                                 goto f_err;
1075                                 }
1076                         if (i == 0)
1077                                 {
1078                                 /* bad signature */
1079                                 al=SSL_AD_DECRYPT_ERROR;
1080                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1081                                 goto f_err;
1082                                 }
1083                         }
1084                 else
1085 #endif
1086 #ifndef NO_DSA
1087                         if (pkey->type == EVP_PKEY_DSA)
1088                         {
1089                         /* lets do DSS */
1090                         EVP_VerifyInit(&md_ctx,EVP_dss1());
1091                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1092                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1093                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1094                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1095                                 {
1096                                 /* bad signature */
1097                                 al=SSL_AD_DECRYPT_ERROR;
1098                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1099                                 goto f_err;
1100                                 }
1101                         }
1102                 else
1103 #endif
1104                         {
1105                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1106                         goto err;
1107                         }
1108                 }
1109         else
1110                 {
1111                 /* still data left over */
1112                 if (!(alg & SSL_aNULL))
1113                         {
1114                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1115                         goto err;
1116                         }
1117                 if (n != 0)
1118                         {
1119                         al=SSL_AD_DECODE_ERROR;
1120                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1121                         goto f_err;
1122                         }
1123                 }
1124         EVP_PKEY_free(pkey);
1125         return(1);
1126 f_err:
1127         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1128 err:
1129         EVP_PKEY_free(pkey);
1130 #ifndef NO_RSA
1131         if (rsa != NULL)
1132                 RSA_free(rsa);
1133 #endif
1134 #ifndef NO_DH
1135         if (dh != NULL)
1136                 DH_free(dh);
1137 #endif
1138         return(-1);
1139         }
1140
1141 static int ssl3_get_certificate_request(SSL *s)
1142         {
1143         int ok,ret=0;
1144         unsigned long n,nc,l;
1145         unsigned int llen,ctype_num,i;
1146         X509_NAME *xn=NULL;
1147         unsigned char *p,*d,*q;
1148         STACK_OF(X509_NAME) *ca_sk=NULL;
1149
1150         n=ssl3_get_message(s,
1151                 SSL3_ST_CR_CERT_REQ_A,
1152                 SSL3_ST_CR_CERT_REQ_B,
1153                 -1,
1154 #if defined(MSDOS) && !defined(WIN32)
1155                 1024*30,  /* 30k max cert list :-) */
1156 #else
1157                 1024*100, /* 100k max cert list :-) */
1158 #endif
1159                 &ok);
1160
1161         if (!ok) return((int)n);
1162
1163         s->s3->tmp.cert_req=0;
1164
1165         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1166                 {
1167                 s->s3->tmp.reuse_message=1;
1168                 return(1);
1169                 }
1170
1171         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1172                 {
1173                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1174                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1175                 goto err;
1176                 }
1177
1178         /* TLS does not like anon-DH with client cert */
1179         if (s->version > SSL3_VERSION)
1180                 {
1181                 l=s->s3->tmp.new_cipher->algorithms;
1182                 if (l & SSL_aNULL)
1183                         {
1184                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1185                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1186                         goto err;
1187                         }
1188                 }
1189
1190         d=p=(unsigned char *)s->init_buf->data;
1191
1192         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1193                 {
1194                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1195                 goto err;
1196                 }
1197
1198         /* get the certificate types */
1199         ctype_num= *(p++);
1200         if (ctype_num > SSL3_CT_NUMBER)
1201                 ctype_num=SSL3_CT_NUMBER;
1202         for (i=0; i<ctype_num; i++)
1203                 s->s3->tmp.ctype[i]= p[i];
1204         p+=ctype_num;
1205
1206         /* get the CA RDNs */
1207         n2s(p,llen);
1208 #if 0
1209 {
1210 FILE *out;
1211 out=fopen("/tmp/vsign.der","w");
1212 fwrite(p,1,llen,out);
1213 fclose(out);
1214 }
1215 #endif
1216
1217         if ((llen+ctype_num+2+1) != n)
1218                 {
1219                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1220                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1221                 goto err;
1222                 }
1223
1224         for (nc=0; nc<llen; )
1225                 {
1226                 n2s(p,l);
1227                 if ((l+nc+2) > llen)
1228                         {
1229                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1230                                 goto cont; /* netscape bugs */
1231                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1232                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1233                         goto err;
1234                         }
1235
1236                 q=p;
1237
1238                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1239                         {
1240                         /* If netscape tolerance is on, ignore errors */
1241                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1242                                 goto cont;
1243                         else
1244                                 {
1245                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1246                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1247                                 goto err;
1248                                 }
1249                         }
1250
1251                 if (q != (p+l))
1252                         {
1253                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1254                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1255                         goto err;
1256                         }
1257                 if (!sk_X509_NAME_push(ca_sk,xn))
1258                         {
1259                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1260                         goto err;
1261                         }
1262
1263                 p+=l;
1264                 nc+=l+2;
1265                 }
1266
1267         if (0)
1268                 {
1269 cont:
1270                 ERR_clear_error();
1271                 }
1272
1273         /* we should setup a certificate to return.... */
1274         s->s3->tmp.cert_req=1;
1275         s->s3->tmp.ctype_num=ctype_num;
1276         if (s->s3->tmp.ca_names != NULL)
1277                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1278         s->s3->tmp.ca_names=ca_sk;
1279         ca_sk=NULL;
1280
1281         ret=1;
1282 err:
1283         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1284         return(ret);
1285         }
1286
1287 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1288         {
1289         return(X509_NAME_cmp(*a,*b));
1290         }
1291
1292 static int ssl3_get_server_done(SSL *s)
1293         {
1294         int ok,ret=0;
1295         long n;
1296
1297         n=ssl3_get_message(s,
1298                 SSL3_ST_CR_SRVR_DONE_A,
1299                 SSL3_ST_CR_SRVR_DONE_B,
1300                 SSL3_MT_SERVER_DONE,
1301                 30, /* should be very small, like 0 :-) */
1302                 &ok);
1303
1304         if (!ok) return((int)n);
1305         if (n > 0)
1306                 {
1307                 /* should contain no data */
1308                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1309                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1310                 }
1311         ret=1;
1312         return(ret);
1313         }
1314
1315 static int ssl3_send_client_key_exchange(SSL *s)
1316         {
1317         unsigned char *p,*d;
1318         int n;
1319         unsigned long l;
1320 #ifndef NO_RSA
1321         unsigned char *q;
1322         EVP_PKEY *pkey=NULL;
1323 #endif
1324
1325         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1326                 {
1327                 d=(unsigned char *)s->init_buf->data;
1328                 p= &(d[4]);
1329
1330                 l=s->s3->tmp.new_cipher->algorithms;
1331
1332 #ifndef NO_RSA
1333                 if (l & SSL_kRSA)
1334                         {
1335                         RSA *rsa;
1336                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1337
1338                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1339                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1340                         else
1341                                 {
1342                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1343                                 if ((pkey == NULL) ||
1344                                         (pkey->type != EVP_PKEY_RSA) ||
1345                                         (pkey->pkey.rsa == NULL))
1346                                         {
1347                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1348                                         goto err;
1349                                         }
1350                                 rsa=pkey->pkey.rsa;
1351                                 EVP_PKEY_free(pkey);
1352                                 }
1353
1354                         tmp_buf[0]=s->client_version>>8;
1355                         tmp_buf[1]=s->client_version&0xff;
1356                         if (RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2) <= 0)
1357                                         goto err;
1358
1359                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1360
1361                         q=p;
1362                         /* Fix buf for TLS and beyond */
1363                         if (s->version > SSL3_VERSION)
1364                                 p+=2;
1365                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1366                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1367 #ifdef PKCS1_CHECK
1368                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1369                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1370 #endif
1371                         if (n <= 0)
1372                                 {
1373                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1374                                 goto err;
1375                                 }
1376
1377                         /* Fix buf for TLS and beyond */
1378                         if (s->version > SSL3_VERSION)
1379                                 {
1380                                 s2n(n,q);
1381                                 n+=2;
1382                                 }
1383
1384                         s->session->master_key_length=
1385                                 s->method->ssl3_enc->generate_master_secret(s,
1386                                         s->session->master_key,
1387                                         tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1388                         memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1389                         }
1390                 else
1391 #endif
1392 #ifndef NO_DH
1393                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1394                         {
1395                         DH *dh_srvr,*dh_clnt;
1396
1397                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1398                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1399                         else
1400                                 {
1401                                 /* we get them from the cert */
1402                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1403                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1404                                 goto err;
1405                                 }
1406
1407                         /* generate a new random key */
1408                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1409                                 {
1410                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1411                                 goto err;
1412                                 }
1413                         if (!DH_generate_key(dh_clnt))
1414                                 {
1415                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1416                                 goto err;
1417                                 }
1418
1419                         /* use the 'p' output buffer for the DH key, but
1420                          * make sure to clear it out afterwards */
1421
1422                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1423
1424                         if (n <= 0)
1425                                 {
1426                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1427                                 goto err;
1428                                 }
1429
1430                         /* generate master key from the result */
1431                         s->session->master_key_length=
1432                                 s->method->ssl3_enc->generate_master_secret(s,
1433                                         s->session->master_key,p,n);
1434                         /* clean up */
1435                         memset(p,0,n);
1436
1437                         /* send off the data */
1438                         n=BN_num_bytes(dh_clnt->pub_key);
1439                         s2n(n,p);
1440                         BN_bn2bin(dh_clnt->pub_key,p);
1441                         n+=2;
1442
1443                         DH_free(dh_clnt);
1444
1445                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1446                         }
1447                 else
1448 #endif
1449                         {
1450                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1451                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1452                         goto err;
1453                         }
1454
1455                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1456                 l2n3(n,d);
1457
1458                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1459                 /* number of bytes to write */
1460                 s->init_num=n+4;
1461                 s->init_off=0;
1462                 }
1463
1464         /* SSL3_ST_CW_KEY_EXCH_B */
1465         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1466 err:
1467         return(-1);
1468         }
1469
1470 static int ssl3_send_client_verify(SSL *s)
1471         {
1472         unsigned char *p,*d;
1473         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1474         EVP_PKEY *pkey;
1475 #ifndef NO_RSA
1476         unsigned u=0;
1477 #endif
1478         unsigned long n;
1479 #ifndef NO_DSA
1480         int j;
1481 #endif
1482
1483         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1484                 {
1485                 d=(unsigned char *)s->init_buf->data;
1486                 p= &(d[4]);
1487                 pkey=s->cert->key->privatekey;
1488
1489                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1490                         &(data[MD5_DIGEST_LENGTH]));
1491
1492 #ifndef NO_RSA
1493                 if (pkey->type == EVP_PKEY_RSA)
1494                         {
1495                         s->method->ssl3_enc->cert_verify_mac(s,
1496                                 &(s->s3->finish_dgst1),&(data[0]));
1497                         if (RSA_sign(NID_md5_sha1, data,
1498                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1499                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1500                                 {
1501                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1502                                 goto err;
1503                                 }
1504                         s2n(u,p);
1505                         n=u+2;
1506                         }
1507                 else
1508 #endif
1509 #ifndef NO_DSA
1510                         if (pkey->type == EVP_PKEY_DSA)
1511                         {
1512                         if (!DSA_sign(pkey->save_type,
1513                                 &(data[MD5_DIGEST_LENGTH]),
1514                                 SHA_DIGEST_LENGTH,&(p[2]),
1515                                 (unsigned int *)&j,pkey->pkey.dsa))
1516                                 {
1517                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1518                                 goto err;
1519                                 }
1520                         s2n(j,p);
1521                         n=j+2;
1522                         }
1523                 else
1524 #endif
1525                         {
1526                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,SSL_R_INTERNAL_ERROR);
1527                         goto err;
1528                         }
1529                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1530                 l2n3(n,d);
1531
1532                 s->init_num=(int)n+4;
1533                 s->init_off=0;
1534                 }
1535         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1536 err:
1537         return(-1);
1538         }
1539
1540 static int ssl3_send_client_certificate(SSL *s)
1541         {
1542         X509 *x509=NULL;
1543         EVP_PKEY *pkey=NULL;
1544         int i;
1545         unsigned long l;
1546
1547         if (s->state == SSL3_ST_CW_CERT_A)
1548                 {
1549                 if ((s->cert == NULL) ||
1550                         (s->cert->key->x509 == NULL) ||
1551                         (s->cert->key->privatekey == NULL))
1552                         s->state=SSL3_ST_CW_CERT_B;
1553                 else
1554                         s->state=SSL3_ST_CW_CERT_C;
1555                 }
1556
1557         /* We need to get a client cert */
1558         if (s->state == SSL3_ST_CW_CERT_B)
1559                 {
1560                 /* If we get an error, we need to
1561                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1562                  * We then get retied later */
1563                 i=0;
1564                 if (s->ctx->client_cert_cb != NULL)
1565                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1566                 if (i < 0)
1567                         {
1568                         s->rwstate=SSL_X509_LOOKUP;
1569                         return(-1);
1570                         }
1571                 s->rwstate=SSL_NOTHING;
1572                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1573                         {
1574                         s->state=SSL3_ST_CW_CERT_B;
1575                         if (    !SSL_use_certificate(s,x509) ||
1576                                 !SSL_use_PrivateKey(s,pkey))
1577                                 i=0;
1578                         }
1579                 else if (i == 1)
1580                         {
1581                         i=0;
1582                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1583                         }
1584
1585                 if (x509 != NULL) X509_free(x509);
1586                 if (pkey != NULL) EVP_PKEY_free(pkey);
1587                 if (i == 0)
1588                         {
1589                         if (s->version == SSL3_VERSION)
1590                                 {
1591                                 s->s3->tmp.cert_req=0;
1592                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1593                                 return(1);
1594                                 }
1595                         else
1596                                 {
1597                                 s->s3->tmp.cert_req=2;
1598                                 }
1599                         }
1600
1601                 /* Ok, we have a cert */
1602                 s->state=SSL3_ST_CW_CERT_C;
1603                 }
1604
1605         if (s->state == SSL3_ST_CW_CERT_C)
1606                 {
1607                 s->state=SSL3_ST_CW_CERT_D;
1608                 l=ssl3_output_cert_chain(s,
1609                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1610                 s->init_num=(int)l;
1611                 s->init_off=0;
1612                 }
1613         /* SSL3_ST_CW_CERT_D */
1614         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1615         }
1616
1617 #define has_bits(i,m)   (((i)&(m)) == (m))
1618
1619 static int ssl3_check_cert_and_algorithm(SSL *s)
1620         {
1621         int i,idx;
1622         long algs;
1623         EVP_PKEY *pkey=NULL;
1624         SESS_CERT *sc;
1625 #ifndef NO_RSA
1626         RSA *rsa;
1627 #endif
1628 #ifndef NO_DH
1629         DH *dh;
1630 #endif
1631
1632         sc=s->session->sess_cert;
1633
1634         if (sc == NULL)
1635                 {
1636                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_INTERNAL_ERROR);
1637                 goto err;
1638                 }
1639
1640         algs=s->s3->tmp.new_cipher->algorithms;
1641
1642         /* we don't have a certificate */
1643         if (algs & (SSL_aDH|SSL_aNULL))
1644                 return(1);
1645
1646 #ifndef NO_RSA
1647         rsa=s->session->sess_cert->peer_rsa_tmp;
1648 #endif
1649 #ifndef NO_DH
1650         dh=s->session->sess_cert->peer_dh_tmp;
1651 #endif
1652
1653         /* This is the passed certificate */
1654
1655         idx=sc->peer_cert_type;
1656         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1657         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1658         EVP_PKEY_free(pkey);
1659
1660
1661         /* Check that we have a certificate if we require one */
1662         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1663                 {
1664                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1665                 goto f_err;
1666                 }
1667 #ifndef NO_DSA
1668         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1669                 {
1670                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1671                 goto f_err;
1672                 }
1673 #endif
1674 #ifndef NO_RSA
1675         if ((algs & SSL_kRSA) &&
1676                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1677                 {
1678                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1679                 goto f_err;
1680                 }
1681 #endif
1682 #ifndef NO_DH
1683         if ((algs & SSL_kEDH) &&
1684                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1685                 {
1686                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1687                 goto f_err;
1688                 }
1689         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1690                 {
1691                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1692                 goto f_err;
1693                 }
1694 #ifndef NO_DSA
1695         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1696                 {
1697                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1698                 goto f_err;
1699                 }
1700 #endif
1701 #endif
1702
1703         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
1704                 {
1705 #ifndef NO_RSA
1706                 if (algs & SSL_kRSA)
1707                         {
1708                         if (rsa == NULL
1709                             || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1710                                 {
1711                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1712                                 goto f_err;
1713                                 }
1714                         }
1715                 else
1716 #endif
1717 #ifndef NO_DH
1718                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1719                             {
1720                             if (dh == NULL
1721                                 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1722                                 {
1723                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1724                                 goto f_err;
1725                                 }
1726                         }
1727                 else
1728 #endif
1729                         {
1730                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1731                         goto f_err;
1732                         }
1733                 }
1734         return(1);
1735 f_err:
1736         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1737 err:
1738         return(0);
1739         }
1740