crypto/openssl-0.9/ssl/s23_clnt.c

   1 /* ssl/s23_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 "ssl_locl.h"
  61 #include <openssl/buffer.h>
  62 #include <openssl/rand.h>
  63 #include <openssl/objects.h>
  64 #include <openssl/evp.h>
  65
  66 static SSL_METHOD *ssl23_get_client_method(int ver);
  67 static int ssl23_client_hello(SSL *s);
  68 static int ssl23_get_server_hello(SSL *s);
  69 static SSL_METHOD *ssl23_get_client_method(int ver)
  70         {
  71 #ifndef OPENSSL_NO_SSL2
  72         if (ver == SSL2_VERSION)
  73                 return(SSLv2_client_method());
  74 #endif
  75         if (ver == SSL3_VERSION)
  76                 return(SSLv3_client_method());
  77         else if (ver == TLS1_VERSION)
  78                 return(TLSv1_client_method());
  79         else
  80                 return(NULL);
  81         }
  82
  83 IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
  84                         ssl_undefined_function,
  85                         ssl23_connect,
  86                         ssl23_get_client_method)
  87
  88 int ssl23_connect(SSL *s)
  89         {
  90         BUF_MEM *buf=NULL;
  91         unsigned long Time=(unsigned long)time(NULL);
  92         void (*cb)(const SSL *ssl,int type,int val)=NULL;
  93         int ret= -1;
  94         int new_state,state;
  95
  96         RAND_add(&Time,sizeof(Time),0);
  97         ERR_clear_error();
  98         clear_sys_error();
  99
 100         if (s->info_callback != NULL)
 101                 cb=s->info_callback;
 102         else if (s->ctx->info_callback != NULL)
 103                 cb=s->ctx->info_callback;
 104
 105         s->in_handshake++;
 106         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 107
 108         for (;;)
 109                 {
 110                 state=s->state;
 111
 112                 switch(s->state)
 113                         {
 114                 case SSL_ST_BEFORE:
 115                 case SSL_ST_CONNECT:
 116                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 117                 case SSL_ST_OK|SSL_ST_CONNECT:
 118
 119                         if (s->session != NULL)
 120                                 {
 121                                 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
 122                                 ret= -1;
 123                                 goto end;
 124                                 }
 125                         s->server=0;
 126                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 127
 128                         /* s->version=TLS1_VERSION; */
 129                         s->type=SSL_ST_CONNECT;
 130
 131                         if (s->init_buf == NULL)
 132                                 {
 133                                 if ((buf=BUF_MEM_new()) == NULL)
 134                                         {
 135                                         ret= -1;
 136                                         goto end;
 137                                         }
 138                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 139                                         {
 140                                         ret= -1;
 141                                         goto end;
 142                                         }
 143                                 s->init_buf=buf;
 144                                 buf=NULL;
 145                                 }
 146
 147                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 148
 149                         ssl3_init_finished_mac(s);
 150
 151                         s->state=SSL23_ST_CW_CLNT_HELLO_A;
 152                         s->ctx->stats.sess_connect++;
 153                         s->init_num=0;
 154                         break;
 155
 156                 case SSL23_ST_CW_CLNT_HELLO_A:
 157                 case SSL23_ST_CW_CLNT_HELLO_B:
 158
 159                         s->shutdown=0;
 160                         ret=ssl23_client_hello(s);
 161                         if (ret <= 0) goto end;
 162                         s->state=SSL23_ST_CR_SRVR_HELLO_A;
 163                         s->init_num=0;
 164
 165                         break;
 166
 167                 case SSL23_ST_CR_SRVR_HELLO_A:
 168                 case SSL23_ST_CR_SRVR_HELLO_B:
 169                         ret=ssl23_get_server_hello(s);
 170                         if (ret >= 0) cb=NULL;
 171                         goto end;
 172                         /* break; */
 173
 174                 default:
 175                         SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
 176                         ret= -1;
 177                         goto end;
 178                         /* break; */
 179                         }
 180
 181                 if (s->debug) { (void)BIO_flush(s->wbio); }
 182
 183                 if ((cb != NULL) && (s->state != state))
 184                         {
 185                         new_state=s->state;
 186                         s->state=state;
 187                         cb(s,SSL_CB_CONNECT_LOOP,1);
 188                         s->state=new_state;
 189                         }
 190                 }
 191 end:
 192         s->in_handshake--;
 193         if (buf != NULL)
 194                 BUF_MEM_free(buf);
 195         if (cb != NULL)
 196                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 197         return(ret);
 198         }
 199
 200
 201 static int ssl23_client_hello(SSL *s)
 202         {
 203         unsigned char *buf;
 204         unsigned char *p,*d;
 205         int i,j,ch_len;
 206         unsigned long Time,l;
 207         int ssl2_compat;
 208         int version = 0, version_major, version_minor;
 209         SSL_COMP *comp;
 210         int ret;
 211
 212         ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
 213
 214         if (!(s->options & SSL_OP_NO_TLSv1))
 215                 {
 216                 version = TLS1_VERSION;
 217                 }
 218         else if (!(s->options & SSL_OP_NO_SSLv3))
 219                 {
 220                 version = SSL3_VERSION;
 221                 }
 222         else if (!(s->options & SSL_OP_NO_SSLv2))
 223                 {
 224                 version = SSL2_VERSION;
 225                 }
 226 #ifndef OPENSSL_NO_TLSEXT
 227         if (version != SSL2_VERSION)
 228                 {
 229                 /* have to disable SSL 2.0 compatibility if we need TLS extensions */
 230
 231                 if (s->tlsext_hostname != NULL)
 232                         ssl2_compat = 0;
 233                 }
 234 #endif
 235
 236         buf=(unsigned char *)s->init_buf->data;
 237         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 238                 {
 239 #if 0
 240                 /* don't reuse session-id's */
 241                 if (!ssl_get_new_session(s,0))
 242                         {
 243                         return(-1);
 244                         }
 245 #endif
 246
 247                 p=s->s3->client_random;
 248                 Time=(unsigned long)time(NULL);         /* Time */
 249                 l2n(Time,p);
 250                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 251                         return -1;
 252
 253                 if (version == TLS1_VERSION)
 254                         {
 255                         version_major = TLS1_VERSION_MAJOR;
 256                         version_minor = TLS1_VERSION_MINOR;
 257                         }
 258                 else if (version == SSL3_VERSION)
 259                         {
 260                         version_major = SSL3_VERSION_MAJOR;
 261                         version_minor = SSL3_VERSION_MINOR;
 262                         }
 263                 else if (version == SSL2_VERSION)
 264                         {
 265                         version_major = SSL2_VERSION_MAJOR;
 266                         version_minor = SSL2_VERSION_MINOR;
 267                         }
 268                 else
 269                         {
 270                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
 271                         return(-1);
 272                         }
 273
 274                 s->client_version = version;
 275
 276                 if (ssl2_compat)
 277                         {
 278                         /* create SSL 2.0 compatible Client Hello */
 279
 280                         /* two byte record header will be written last */
 281                         d = &(buf[2]);
 282                         p = d + 9; /* leave space for message type, version, individual length fields */
 283
 284                         *(d++) = SSL2_MT_CLIENT_HELLO;
 285                         *(d++) = version_major;
 286                         *(d++) = version_minor;
 287
 288                         /* Ciphers supported */
 289                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
 290                         if (i == 0)
 291                                 {
 292                                 /* no ciphers */
 293                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 294                                 return -1;
 295                                 }
 296                         s2n(i,d);
 297                         p+=i;
 298
 299                         /* put in the session-id length (zero since there is no reuse) */
 300 #if 0
 301                         s->session->session_id_length=0;
 302 #endif
 303                         s2n(0,d);
 304
 305                         if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 306                                 ch_len=SSL2_CHALLENGE_LENGTH;
 307                         else
 308                                 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 309
 310                         /* write out sslv2 challenge */
 311                         if (SSL3_RANDOM_SIZE < ch_len)
 312                                 i=SSL3_RANDOM_SIZE;
 313                         else
 314                                 i=ch_len;
 315                         s2n(i,d);
 316                         memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
 317                         if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
 318                                 return -1;
 319
 320                         memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 321                         p+=i;
 322
 323                         i= p- &(buf[2]);
 324                         buf[0]=((i>>8)&0xff)|0x80;
 325                         buf[1]=(i&0xff);
 326
 327                         /* number of bytes to write */
 328                         s->init_num=i+2;
 329                         s->init_off=0;
 330
 331                         ssl3_finish_mac(s,&(buf[2]),i);
 332                         }
 333                 else
 334                         {
 335                         /* create Client Hello in SSL 3.0/TLS 1.0 format */
 336
 337                         /* do the record header (5 bytes) and handshake message header (4 bytes) last */
 338                         d = p = &(buf[9]);
 339
 340                         *(p++) = version_major;
 341                         *(p++) = version_minor;
 342
 343                         /* Random stuff */
 344                         memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
 345                         p += SSL3_RANDOM_SIZE;
 346
 347                         /* Session ID (zero since there is no reuse) */
 348                         *(p++) = 0;
 349
 350                         /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
 351                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
 352                         if (i == 0)
 353                                 {
 354                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 355                                 return -1;
 356                                 }
 357                         s2n(i,p);
 358                         p+=i;
 359
 360                         /* COMPRESSION */
 361                         if (s->ctx->comp_methods == NULL)
 362                                 j=0;
 363                         else
 364                                 j=sk_SSL_COMP_num(s->ctx->comp_methods);
 365                         *(p++)=1+j;
 366                         for (i=0; i<j; i++)
 367                                 {
 368                                 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 369                                 *(p++)=comp->id;
 370                                 }
 371                         *(p++)=0; /* Add the NULL method */
 372 #ifndef OPENSSL_NO_TLSEXT
 373                         if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 374                                 {
 375                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 376                                 return -1;
 377                                 }
 378 #endif
 379
 380                         l = p-d;
 381                         *p = 42;
 382
 383                         /* fill in 4-byte handshake header */
 384                         d=&(buf[5]);
 385                         *(d++)=SSL3_MT_CLIENT_HELLO;
 386                         l2n3(l,d);
 387
 388                         l += 4;
 389
 390                         if (l > SSL3_RT_MAX_PLAIN_LENGTH)
 391                                 {
 392                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 393                                 return -1;
 394                                 }
 395
 396                         /* fill in 5-byte record header */
 397                         d=buf;
 398                         *(d++) = SSL3_RT_HANDSHAKE;
 399                         *(d++) = version_major;
 400                         *(d++) = version_minor; /* arguably we should send the *lowest* suported version here
 401                                                  * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
 402                         s2n((int)l,d);
 403
 404                         /* number of bytes to write */
 405                         s->init_num=p-buf;
 406                         s->init_off=0;
 407
 408                         ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
 409                         }
 410
 411                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
 412                 s->init_off=0;
 413                 }
 414
 415         /* SSL3_ST_CW_CLNT_HELLO_B */
 416         ret = ssl23_write_bytes(s);
 417
 418         if ((ret >= 2) && s->msg_callback)
 419                 {
 420                 /* Client Hello has been sent; tell msg_callback */
 421
 422                 if (ssl2_compat)
 423                         s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
 424                 else
 425                         s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
 426                 }
 427
 428         return ret;
 429         }
 430
 431 static int ssl23_get_server_hello(SSL *s)
 432         {
 433         char buf[8];
 434         unsigned char *p;
 435         int i;
 436         int n;
 437
 438         n=ssl23_read_bytes(s,7);
 439
 440         if (n != 7) return(n);
 441         p=s->packet;
 442
 443         memcpy(buf,p,n);
 444
 445         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 446                 (p[5] == 0x00) && (p[6] == 0x02))
 447                 {
 448 #ifdef OPENSSL_NO_SSL2
 449                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 450                 goto err;
 451 #else
 452                 /* we are talking sslv2 */
 453                 /* we need to clean up the SSLv3 setup and put in the
 454                  * sslv2 stuff. */
 455                 int ch_len;
 456
 457                 if (s->options & SSL_OP_NO_SSLv2)
 458                         {
 459                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 460                         goto err;
 461                         }
 462                 if (s->s2 == NULL)
 463                         {
 464                         if (!ssl2_new(s))
 465                                 goto err;
 466                         }
 467                 else
 468                         ssl2_clear(s);
 469
 470                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 471                         ch_len=SSL2_CHALLENGE_LENGTH;
 472                 else
 473                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 474
 475                 /* write out sslv2 challenge */
 476                 i=(SSL3_RANDOM_SIZE < ch_len)
 477                         ?SSL3_RANDOM_SIZE:ch_len;
 478                 s->s2->challenge_length=i;
 479                 memcpy(s->s2->challenge,
 480                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 481
 482                 if (s->s3 != NULL) ssl3_free(s);
 483
 484                 if (!BUF_MEM_grow_clean(s->init_buf,
 485                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 486                         {
 487                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
 488                         goto err;
 489                         }
 490
 491                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
 492                 if (!(s->client_version == SSL2_VERSION))
 493                         /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
 494                         s->s2->ssl2_rollback=1;
 495
 496                 /* setup the 5 bytes we have read so we get them from
 497                  * the sslv2 buffer */
 498                 s->rstate=SSL_ST_READ_HEADER;
 499                 s->packet_length=n;
 500                 s->packet= &(s->s2->rbuf[0]);
 501                 memcpy(s->packet,buf,n);
 502                 s->s2->rbuf_left=n;
 503                 s->s2->rbuf_offs=0;
 504
 505                 /* we have already written one */
 506                 s->s2->write_sequence=1;
 507
 508                 s->method=SSLv2_client_method();
 509                 s->handshake_func=s->method->ssl_connect;
 510 #endif
 511                 }
 512         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 513                  (p[1] == SSL3_VERSION_MAJOR) &&
 514                  ((p[2] == SSL3_VERSION_MINOR) ||
 515                   (p[2] == TLS1_VERSION_MINOR)) &&
 516                  (p[5] == SSL3_MT_SERVER_HELLO))
 517                 {
 518                 /* we have sslv3 or tls1 */
 519
 520                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 521
 522                 /* we are in this state */
 523                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 524
 525                 /* put the 5 bytes we have read into the input buffer
 526                  * for SSLv3 */
 527                 s->rstate=SSL_ST_READ_HEADER;
 528                 s->packet_length=n;
 529                 s->packet= &(s->s3->rbuf.buf[0]);
 530                 memcpy(s->packet,buf,n);
 531                 s->s3->rbuf.left=n;
 532                 s->s3->rbuf.offset=0;
 533
 534                 if ((p[2] == SSL3_VERSION_MINOR) &&
 535                         !(s->options & SSL_OP_NO_SSLv3))
 536                         {
 537                         s->version=SSL3_VERSION;
 538                         s->method=SSLv3_client_method();
 539                         }
 540                 else if ((p[2] == TLS1_VERSION_MINOR) &&
 541                         !(s->options & SSL_OP_NO_TLSv1))
 542                         {
 543                         s->version=TLS1_VERSION;
 544                         s->method=TLSv1_client_method();
 545                         }
 546                 else
 547                         {
 548                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 549                         goto err;
 550                         }
 551
 552                 s->handshake_func=s->method->ssl_connect;
 553                 }
 554         else if ((p[0] == SSL3_RT_ALERT) &&
 555                  (p[1] == SSL3_VERSION_MAJOR) &&
 556                  ((p[2] == SSL3_VERSION_MINOR) ||
 557                   (p[2] == TLS1_VERSION_MINOR)) &&
 558                  (p[3] == 0) &&
 559                  (p[4] == 2))
 560                 {
 561                 void (*cb)(const SSL *ssl,int type,int val)=NULL;
 562                 int j;
 563
 564                 /* An alert */
 565                 if (s->info_callback != NULL)
 566                         cb=s->info_callback;
 567                 else if (s->ctx->info_callback != NULL)
 568                         cb=s->ctx->info_callback;
 569
 570                 i=p[5];
 571                 if (cb != NULL)
 572                         {
 573                         j=(i<<8)|p[6];
 574                         cb(s,SSL_CB_READ_ALERT,j);
 575                         }
 576
 577                 s->rwstate=SSL_NOTHING;
 578                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
 579                 goto err;
 580                 }
 581         else
 582                 {
 583                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 584                 goto err;
 585                 }
 586         s->init_num=0;
 587
 588         /* Since, if we are sending a ssl23 client hello, we are not
 589          * reusing a session-id */
 590         if (!ssl_get_new_session(s,0))
 591                 goto err;
 592
 593         return(SSL_connect(s));
 594 err:
 595         return(-1);
 596         }
 597