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                 if (s->tlsext_status_type != -1)
 234                         ssl2_compat = 0;
 235                 }
 236 #endif
 237
 238         buf=(unsigned char *)s->init_buf->data;
 239         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 240                 {
 241 #if 0
 242                 /* don't reuse session-id's */
 243                 if (!ssl_get_new_session(s,0))
 244                         {
 245                         return(-1);
 246                         }
 247 #endif
 248
 249                 p=s->s3->client_random;
 250                 Time=(unsigned long)time(NULL);         /* Time */
 251                 l2n(Time,p);
 252                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 253                         return -1;
 254
 255                 if (version == TLS1_VERSION)
 256                         {
 257                         version_major = TLS1_VERSION_MAJOR;
 258                         version_minor = TLS1_VERSION_MINOR;
 259                         }
 260                 else if (version == SSL3_VERSION)
 261                         {
 262                         version_major = SSL3_VERSION_MAJOR;
 263                         version_minor = SSL3_VERSION_MINOR;
 264                         }
 265                 else if (version == SSL2_VERSION)
 266                         {
 267                         version_major = SSL2_VERSION_MAJOR;
 268                         version_minor = SSL2_VERSION_MINOR;
 269                         }
 270                 else
 271                         {
 272                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
 273                         return(-1);
 274                         }
 275
 276                 s->client_version = version;
 277
 278                 if (ssl2_compat)
 279                         {
 280                         /* create SSL 2.0 compatible Client Hello */
 281
 282                         /* two byte record header will be written last */
 283                         d = &(buf[2]);
 284                         p = d + 9; /* leave space for message type, version, individual length fields */
 285
 286                         *(d++) = SSL2_MT_CLIENT_HELLO;
 287                         *(d++) = version_major;
 288                         *(d++) = version_minor;
 289
 290                         /* Ciphers supported */
 291                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
 292                         if (i == 0)
 293                                 {
 294                                 /* no ciphers */
 295                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 296                                 return -1;
 297                                 }
 298                         s2n(i,d);
 299                         p+=i;
 300
 301                         /* put in the session-id length (zero since there is no reuse) */
 302 #if 0
 303                         s->session->session_id_length=0;
 304 #endif
 305                         s2n(0,d);
 306
 307                         if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 308                                 ch_len=SSL2_CHALLENGE_LENGTH;
 309                         else
 310                                 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 311
 312                         /* write out sslv2 challenge */
 313                         if (SSL3_RANDOM_SIZE < ch_len)
 314                                 i=SSL3_RANDOM_SIZE;
 315                         else
 316                                 i=ch_len;
 317                         s2n(i,d);
 318                         memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
 319                         if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
 320                                 return -1;
 321
 322                         memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 323                         p+=i;
 324
 325                         i= p- &(buf[2]);
 326                         buf[0]=((i>>8)&0xff)|0x80;
 327                         buf[1]=(i&0xff);
 328
 329                         /* number of bytes to write */
 330                         s->init_num=i+2;
 331                         s->init_off=0;
 332
 333                         ssl3_finish_mac(s,&(buf[2]),i);
 334                         }
 335                 else
 336                         {
 337                         /* create Client Hello in SSL 3.0/TLS 1.0 format */
 338
 339                         /* do the record header (5 bytes) and handshake message header (4 bytes) last */
 340                         d = p = &(buf[9]);
 341
 342                         *(p++) = version_major;
 343                         *(p++) = version_minor;
 344
 345                         /* Random stuff */
 346                         memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
 347                         p += SSL3_RANDOM_SIZE;
 348
 349                         /* Session ID (zero since there is no reuse) */
 350                         *(p++) = 0;
 351
 352                         /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
 353                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
 354                         if (i == 0)
 355                                 {
 356                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 357                                 return -1;
 358                                 }
 359                         s2n(i,p);
 360                         p+=i;
 361
 362                         /* COMPRESSION */
 363                         if (s->ctx->comp_methods == NULL)
 364                                 j=0;
 365                         else
 366                                 j=sk_SSL_COMP_num(s->ctx->comp_methods);
 367                         *(p++)=1+j;
 368                         for (i=0; i<j; i++)
 369                                 {
 370                                 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 371                                 *(p++)=comp->id;
 372                                 }
 373                         *(p++)=0; /* Add the NULL method */
 374 #ifndef OPENSSL_NO_TLSEXT
 375                         if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 376                                 {
 377                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 378                                 return -1;
 379                                 }
 380 #endif
 381
 382                         l = p-d;
 383                         *p = 42;
 384
 385                         /* fill in 4-byte handshake header */
 386                         d=&(buf[5]);
 387                         *(d++)=SSL3_MT_CLIENT_HELLO;
 388                         l2n3(l,d);
 389
 390                         l += 4;
 391
 392                         if (l > SSL3_RT_MAX_PLAIN_LENGTH)
 393                                 {
 394                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 395                                 return -1;
 396                                 }
 397
 398                         /* fill in 5-byte record header */
 399                         d=buf;
 400                         *(d++) = SSL3_RT_HANDSHAKE;
 401                         *(d++) = version_major;
 402                         *(d++) = version_minor; /* arguably we should send the *lowest* suported version here
 403                                                  * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
 404                         s2n((int)l,d);
 405
 406                         /* number of bytes to write */
 407                         s->init_num=p-buf;
 408                         s->init_off=0;
 409
 410                         ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
 411                         }
 412
 413                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
 414                 s->init_off=0;
 415                 }
 416
 417         /* SSL3_ST_CW_CLNT_HELLO_B */
 418         ret = ssl23_write_bytes(s);
 419
 420         if ((ret >= 2) && s->msg_callback)
 421                 {
 422                 /* Client Hello has been sent; tell msg_callback */
 423
 424                 if (ssl2_compat)
 425                         s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
 426                 else
 427                         s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
 428                 }
 429
 430         return ret;
 431         }
 432
 433 static int ssl23_get_server_hello(SSL *s)
 434         {
 435         char buf[8];
 436         unsigned char *p;
 437         int i;
 438         int n;
 439
 440         n=ssl23_read_bytes(s,7);
 441
 442         if (n != 7) return(n);
 443         p=s->packet;
 444
 445         memcpy(buf,p,n);
 446
 447         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 448                 (p[5] == 0x00) && (p[6] == 0x02))
 449                 {
 450 #ifdef OPENSSL_NO_SSL2
 451                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 452                 goto err;
 453 #else
 454                 /* we are talking sslv2 */
 455                 /* we need to clean up the SSLv3 setup and put in the
 456                  * sslv2 stuff. */
 457                 int ch_len;
 458
 459                 if (s->options & SSL_OP_NO_SSLv2)
 460                         {
 461                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 462                         goto err;
 463                         }
 464                 if (s->s2 == NULL)
 465                         {
 466                         if (!ssl2_new(s))
 467                                 goto err;
 468                         }
 469                 else
 470                         ssl2_clear(s);
 471
 472                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 473                         ch_len=SSL2_CHALLENGE_LENGTH;
 474                 else
 475                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 476
 477                 /* write out sslv2 challenge */
 478                 i=(SSL3_RANDOM_SIZE < ch_len)
 479                         ?SSL3_RANDOM_SIZE:ch_len;
 480                 s->s2->challenge_length=i;
 481                 memcpy(s->s2->challenge,
 482                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 483
 484                 if (s->s3 != NULL) ssl3_free(s);
 485
 486                 if (!BUF_MEM_grow_clean(s->init_buf,
 487                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 488                         {
 489                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
 490                         goto err;
 491                         }
 492
 493                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
 494                 if (!(s->client_version == SSL2_VERSION))
 495                         /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
 496                         s->s2->ssl2_rollback=1;
 497
 498                 /* setup the 5 bytes we have read so we get them from
 499                  * the sslv2 buffer */
 500                 s->rstate=SSL_ST_READ_HEADER;
 501                 s->packet_length=n;
 502                 s->packet= &(s->s2->rbuf[0]);
 503                 memcpy(s->packet,buf,n);
 504                 s->s2->rbuf_left=n;
 505                 s->s2->rbuf_offs=0;
 506
 507                 /* we have already written one */
 508                 s->s2->write_sequence=1;
 509
 510                 s->method=SSLv2_client_method();
 511                 s->handshake_func=s->method->ssl_connect;
 512 #endif
 513                 }
 514         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 515                  (p[1] == SSL3_VERSION_MAJOR) &&
 516                  ((p[2] == SSL3_VERSION_MINOR) ||
 517                   (p[2] == TLS1_VERSION_MINOR)) &&
 518                  (p[5] == SSL3_MT_SERVER_HELLO))
 519                 {
 520                 /* we have sslv3 or tls1 */
 521
 522                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 523
 524                 /* we are in this state */
 525                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 526
 527                 /* put the 5 bytes we have read into the input buffer
 528                  * for SSLv3 */
 529                 s->rstate=SSL_ST_READ_HEADER;
 530                 s->packet_length=n;
 531                 s->packet= &(s->s3->rbuf.buf[0]);
 532                 memcpy(s->packet,buf,n);
 533                 s->s3->rbuf.left=n;
 534                 s->s3->rbuf.offset=0;
 535
 536                 if ((p[2] == SSL3_VERSION_MINOR) &&
 537                         !(s->options & SSL_OP_NO_SSLv3))
 538                         {
 539                         s->version=SSL3_VERSION;
 540                         s->method=SSLv3_client_method();
 541                         }
 542                 else if ((p[2] == TLS1_VERSION_MINOR) &&
 543                         !(s->options & SSL_OP_NO_TLSv1))
 544                         {
 545                         s->version=TLS1_VERSION;
 546                         s->method=TLSv1_client_method();
 547                         }
 548                 else
 549                         {
 550                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 551                         goto err;
 552                         }
 553
 554                 s->handshake_func=s->method->ssl_connect;
 555                 }
 556         else if ((p[0] == SSL3_RT_ALERT) &&
 557                  (p[1] == SSL3_VERSION_MAJOR) &&
 558                  ((p[2] == SSL3_VERSION_MINOR) ||
 559                   (p[2] == TLS1_VERSION_MINOR)) &&
 560                  (p[3] == 0) &&
 561                  (p[4] == 2))
 562                 {
 563                 void (*cb)(const SSL *ssl,int type,int val)=NULL;
 564                 int j;
 565
 566                 /* An alert */
 567                 if (s->info_callback != NULL)
 568                         cb=s->info_callback;
 569                 else if (s->ctx->info_callback != NULL)
 570                         cb=s->ctx->info_callback;
 571
 572                 i=p[5];
 573                 if (cb != NULL)
 574                         {
 575                         j=(i<<8)|p[6];
 576                         cb(s,SSL_CB_READ_ALERT,j);
 577                         }
 578
 579                 s->rwstate=SSL_NOTHING;
 580                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
 581                 goto err;
 582                 }
 583         else
 584                 {
 585                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 586                 goto err;
 587                 }
 588         s->init_num=0;
 589
 590         /* Since, if we are sending a ssl23 client hello, we are not
 591          * reusing a session-id */
 592         if (!ssl_get_new_session(s,0))
 593                 goto err;
 594
 595         return(SSL_connect(s));
 596 err:
 597         return(-1);
 598         }
 599