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