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