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  * Copyright (c) 1998-2006 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include <stdio.h>
 113 #include "ssl_locl.h"
 114 #include <openssl/buffer.h>
 115 #include <openssl/rand.h>
 116 #include <openssl/objects.h>
 117 #include <openssl/evp.h>
 118
 119 static const SSL_METHOD *ssl23_get_client_method(int ver);
 120 static int ssl23_client_hello(SSL *s);
 121 static int ssl23_get_server_hello(SSL *s);
 122 static const SSL_METHOD *ssl23_get_client_method(int ver)
 123         {
 124 #ifndef OPENSSL_NO_SSL2
 125         if (ver == SSL2_VERSION)
 126                 return(SSLv2_client_method());
 127 #endif
 128 #ifndef OPENSSL_NO_SSL3
 129         if (ver == SSL3_VERSION)
 130                 return(SSLv3_client_method());
 131 #endif
 132         if (ver == TLS1_VERSION)
 133                 return(TLSv1_client_method());
 134         else if (ver == TLS1_1_VERSION)
 135                 return(TLSv1_1_client_method());
 136         else if (ver == TLS1_2_VERSION)
 137                 return(TLSv1_2_client_method());
 138         else
 139                 return(NULL);
 140         }
 141
 142 IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
 143                         ssl_undefined_function,
 144                         ssl23_connect,
 145                         ssl23_get_client_method)
 146
 147 int ssl23_connect(SSL *s)
 148         {
 149         BUF_MEM *buf=NULL;
 150         unsigned long Time=(unsigned long)time(NULL);
 151         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 152         int ret= -1;
 153         int new_state,state;
 154
 155         RAND_add(&Time,sizeof(Time),0);
 156         ERR_clear_error();
 157         clear_sys_error();
 158
 159         if (s->info_callback != NULL)
 160                 cb=s->info_callback;
 161         else if (s->ctx->info_callback != NULL)
 162                 cb=s->ctx->info_callback;
 163
 164         s->in_handshake++;
 165         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 166
 167         for (;;)
 168                 {
 169                 state=s->state;
 170
 171                 switch(s->state)
 172                         {
 173                 case SSL_ST_BEFORE:
 174                 case SSL_ST_CONNECT:
 175                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 176                 case SSL_ST_OK|SSL_ST_CONNECT:
 177
 178                         if (s->session != NULL)
 179                                 {
 180                                 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
 181                                 ret= -1;
 182                                 goto end;
 183                                 }
 184                         s->server=0;
 185                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 186
 187                         /* s->version=TLS1_VERSION; */
 188                         s->type=SSL_ST_CONNECT;
 189
 190                         if (s->init_buf == NULL)
 191                                 {
 192                                 if ((buf=BUF_MEM_new()) == NULL)
 193                                         {
 194                                         ret= -1;
 195                                         goto end;
 196                                         }
 197                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 198                                         {
 199                                         ret= -1;
 200                                         goto end;
 201                                         }
 202                                 s->init_buf=buf;
 203                                 buf=NULL;
 204                                 }
 205
 206                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 207
 208                         ssl3_init_finished_mac(s);
 209
 210                         s->state=SSL23_ST_CW_CLNT_HELLO_A;
 211                         s->ctx->stats.sess_connect++;
 212                         s->init_num=0;
 213                         break;
 214
 215                 case SSL23_ST_CW_CLNT_HELLO_A:
 216                 case SSL23_ST_CW_CLNT_HELLO_B:
 217
 218                         s->shutdown=0;
 219                         ret=ssl23_client_hello(s);
 220                         if (ret <= 0) goto end;
 221                         s->state=SSL23_ST_CR_SRVR_HELLO_A;
 222                         s->init_num=0;
 223
 224                         break;
 225
 226                 case SSL23_ST_CR_SRVR_HELLO_A:
 227                 case SSL23_ST_CR_SRVR_HELLO_B:
 228                         ret=ssl23_get_server_hello(s);
 229                         if (ret >= 0) cb=NULL;
 230                         goto end;
 231                         /* break; */
 232
 233                 default:
 234                         SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
 235                         ret= -1;
 236                         goto end;
 237                         /* break; */
 238                         }
 239
 240                 if (s->debug) { (void)BIO_flush(s->wbio); }
 241
 242                 if ((cb != NULL) && (s->state != state))
 243                         {
 244                         new_state=s->state;
 245                         s->state=state;
 246                         cb(s,SSL_CB_CONNECT_LOOP,1);
 247                         s->state=new_state;
 248                         }
 249                 }
 250 end:
 251         s->in_handshake--;
 252         if (buf != NULL)
 253                 BUF_MEM_free(buf);
 254         if (cb != NULL)
 255                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 256         return(ret);
 257         }
 258
 259 static int ssl23_no_ssl2_ciphers(SSL *s)
 260         {
 261         SSL_CIPHER *cipher;
 262         STACK_OF(SSL_CIPHER) *ciphers;
 263         int i;
 264         ssl_set_client_disabled(s);
 265         ciphers = SSL_get_ciphers(s);
 266         for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++)
 267                 {
 268                 cipher = sk_SSL_CIPHER_value(ciphers, i);
 269                 if (ssl_cipher_disabled(s, cipher, SSL_SECOP_CIPHER_SUPPORTED))
 270                         continue;
 271                 if (cipher->algorithm_ssl == SSL_SSLV2)
 272                         return 0;
 273                 }
 274         return 1;
 275         }
 276
 277 /* Fill a ClientRandom or ServerRandom field of length len. Returns <= 0
 278  * on failure, 1 on success. */
 279 int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len)
 280         {
 281                 int send_time = 0;
 282                 if (len < 4)
 283                         return 0;
 284                 if (server)
 285                         send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0;
 286                 else
 287                         send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0;
 288                 if (send_time)
 289                         {
 290                         unsigned long Time = (unsigned long)time(NULL);
 291                         unsigned char *p = result;
 292                         l2n(Time, p);
 293                         return RAND_pseudo_bytes(p, len-4);
 294                         }
 295                 else
 296                         return RAND_pseudo_bytes(result, len);
 297         }
 298
 299 static int ssl23_client_hello(SSL *s)
 300         {
 301         unsigned char *buf;
 302         unsigned char *p,*d;
 303         int i,ch_len;
 304         unsigned long l;
 305         int ssl2_compat;
 306         int version = 0, version_major, version_minor;
 307         int al = 0;
 308 #ifndef OPENSSL_NO_COMP
 309         int j;
 310         SSL_COMP *comp;
 311 #endif
 312         int ret;
 313         unsigned long mask, options = s->options;
 314
 315         ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1;
 316
 317         if (ssl2_compat && !ssl_security(s, SSL_SECOP_SSL2_COMPAT, 0, 0, NULL))
 318                 ssl2_compat = 0;
 319         if (ssl2_compat && ssl23_no_ssl2_ciphers(s))
 320                 ssl2_compat = 0;
 321
 322         /*
 323          * SSL_OP_NO_X disables all protocols above X *if* there are
 324          * some protocols below X enabled. This is required in order
 325          * to maintain "version capability" vector contiguous. So
 326          * that if application wants to disable TLS1.0 in favour of
 327          * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the
 328          * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2.
 329          */
 330         mask =  SSL_OP_NO_TLSv1_1|SSL_OP_NO_TLSv1
 331 #if !defined(OPENSSL_NO_SSL3)
 332                 |SSL_OP_NO_SSLv3
 333 #endif
 334 #if !defined(OPENSSL_NO_SSL2)
 335                 |(ssl2_compat?SSL_OP_NO_SSLv2:0)
 336 #endif
 337                 ;
 338 #if !defined(OPENSSL_NO_TLS1_2_CLIENT)
 339         version = TLS1_2_VERSION;
 340
 341         if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask)
 342                 version = TLS1_1_VERSION;
 343 #else
 344         version = TLS1_1_VERSION;
 345 #endif
 346         mask &= ~SSL_OP_NO_TLSv1_1;
 347         if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
 348                 version = TLS1_VERSION;
 349         mask &= ~SSL_OP_NO_TLSv1;
 350 #if !defined(OPENSSL_NO_SSL3)
 351         if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
 352                 version = SSL3_VERSION;
 353         mask &= ~SSL_OP_NO_SSLv3;
 354 #endif
 355 #if !defined(OPENSSL_NO_SSL2)
 356         if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask)
 357                 version = SSL2_VERSION;
 358 #endif
 359
 360 #ifndef OPENSSL_NO_TLSEXT
 361         if (version != SSL2_VERSION)
 362                 {
 363                 /* have to disable SSL 2.0 compatibility if we need TLS extensions */
 364
 365                 if (s->tlsext_hostname != NULL)
 366                         ssl2_compat = 0;
 367                 if (s->tlsext_status_type != -1)
 368                         ssl2_compat = 0;
 369 #ifdef TLSEXT_TYPE_opaque_prf_input
 370                 if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL)
 371                         ssl2_compat = 0;
 372 #endif
 373                 if (s->cert->cli_ext.meths_count != 0)
 374                         ssl2_compat = 0;
 375                 }
 376 #endif
 377
 378         buf=(unsigned char *)s->init_buf->data;
 379         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 380                 {
 381 #if 0
 382                 /* don't reuse session-id's */
 383                 if (!ssl_get_new_session(s,0))
 384                         {
 385                         return(-1);
 386                         }
 387 #endif
 388
 389                 p=s->s3->client_random;
 390                 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
 391                         return -1;
 392
 393                 if (version == TLS1_2_VERSION)
 394                         {
 395                         version_major = TLS1_2_VERSION_MAJOR;
 396                         version_minor = TLS1_2_VERSION_MINOR;
 397                         }
 398                 else if (tls1_suiteb(s))
 399                         {
 400                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,
 401                                         SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
 402                         return -1;
 403                         }
 404                 else if (version == TLS1_1_VERSION)
 405                         {
 406                         version_major = TLS1_1_VERSION_MAJOR;
 407                         version_minor = TLS1_1_VERSION_MINOR;
 408                         }
 409                 else if (version == TLS1_VERSION)
 410                         {
 411                         version_major = TLS1_VERSION_MAJOR;
 412                         version_minor = TLS1_VERSION_MINOR;
 413                         }
 414 #ifdef OPENSSL_FIPS
 415                 else if(FIPS_mode())
 416                         {
 417                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,
 418                                         SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
 419                         return -1;
 420                         }
 421 #endif
 422                 else if (version == SSL3_VERSION)
 423                         {
 424                         version_major = SSL3_VERSION_MAJOR;
 425                         version_minor = SSL3_VERSION_MINOR;
 426                         }
 427                 else if (version == SSL2_VERSION)
 428                         {
 429                         version_major = SSL2_VERSION_MAJOR;
 430                         version_minor = SSL2_VERSION_MINOR;
 431                         }
 432                 else
 433                         {
 434                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
 435                         return(-1);
 436                         }
 437
 438                 s->client_version = version;
 439
 440                 if (ssl2_compat)
 441                         {
 442                         /* create SSL 2.0 compatible Client Hello */
 443
 444                         /* two byte record header will be written last */
 445                         d = &(buf[2]);
 446                         p = d + 9; /* leave space for message type, version, individual length fields */
 447
 448                         *(d++) = SSL2_MT_CLIENT_HELLO;
 449                         *(d++) = version_major;
 450                         *(d++) = version_minor;
 451
 452                         /* Ciphers supported */
 453                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
 454                         if (i == 0)
 455                                 {
 456                                 /* no ciphers */
 457                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 458                                 return -1;
 459                                 }
 460                         s2n(i,d);
 461                         p+=i;
 462
 463                         /* put in the session-id length (zero since there is no reuse) */
 464 #if 0
 465                         s->session->session_id_length=0;
 466 #endif
 467                         s2n(0,d);
 468
 469                         if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 470                                 ch_len=SSL2_CHALLENGE_LENGTH;
 471                         else
 472                                 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 473
 474                         /* write out sslv2 challenge */
 475                         /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32),
 476                            because it is one of SSL2_MAX_CHALLENGE_LENGTH (32)
 477                            or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the
 478                            check in for futurproofing */
 479                         if (SSL3_RANDOM_SIZE < ch_len)
 480                                 i=SSL3_RANDOM_SIZE;
 481                         else
 482                                 i=ch_len;
 483                         s2n(i,d);
 484                         memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
 485                         if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
 486                                 return -1;
 487
 488                         memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 489                         p+=i;
 490
 491                         i= p- &(buf[2]);
 492                         buf[0]=((i>>8)&0xff)|0x80;
 493                         buf[1]=(i&0xff);
 494
 495                         /* number of bytes to write */
 496                         s->init_num=i+2;
 497                         s->init_off=0;
 498
 499                         ssl3_finish_mac(s,&(buf[2]),i);
 500                         }
 501                 else
 502                         {
 503                         /* create Client Hello in SSL 3.0/TLS 1.0 format */
 504
 505                         /* do the record header (5 bytes) and handshake message header (4 bytes) last */
 506                         d = p = &(buf[9]);
 507
 508                         *(p++) = version_major;
 509                         *(p++) = version_minor;
 510
 511                         /* Random stuff */
 512                         memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
 513                         p += SSL3_RANDOM_SIZE;
 514
 515                         /* Session ID (zero since there is no reuse) */
 516                         *(p++) = 0;
 517
 518                         /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
 519                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
 520                         if (i == 0)
 521                                 {
 522                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 523                                 return -1;
 524                                 }
 525 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 526                         /* Some servers hang if client hello > 256 bytes
 527                          * as hack workaround chop number of supported ciphers
 528                          * to keep it well below this if we use TLS v1.2
 529                          */
 530                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 531                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 532                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 533 #endif
 534                         s2n(i,p);
 535                         p+=i;
 536
 537                         /* COMPRESSION */
 538 #ifdef OPENSSL_NO_COMP
 539                         *(p++)=1;
 540 #else
 541                         if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
 542                                 j=0;
 543                         else
 544                                 j=sk_SSL_COMP_num(s->ctx->comp_methods);
 545                         *(p++)=1+j;
 546                         for (i=0; i<j; i++)
 547                                 {
 548                                 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 549                                 *(p++)=comp->id;
 550                                 }
 551 #endif
 552                         *(p++)=0; /* Add the NULL method */
 553
 554 #ifndef OPENSSL_NO_TLSEXT
 555                         /* TLS extensions*/
 556                         if (ssl_prepare_clienthello_tlsext(s) <= 0)
 557                                 {
 558                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 559                                 return -1;
 560                                 }
 561                         if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
 562                                 {
 563                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 564                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 565                                 return -1;
 566                                 }
 567 #endif
 568
 569                         l = p-d;
 570
 571                         /* fill in 4-byte handshake header */
 572                         d=&(buf[5]);
 573                         *(d++)=SSL3_MT_CLIENT_HELLO;
 574                         l2n3(l,d);
 575
 576                         l += 4;
 577
 578                         if (l > SSL3_RT_MAX_PLAIN_LENGTH)
 579                                 {
 580                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 581                                 return -1;
 582                                 }
 583
 584                         /* fill in 5-byte record header */
 585                         d=buf;
 586                         *(d++) = SSL3_RT_HANDSHAKE;
 587                         *(d++) = version_major;
 588                         /* Some servers hang if we use long client hellos
 589                          * and a record number > TLS 1.0.
 590                          */
 591                         if (TLS1_get_client_version(s) > TLS1_VERSION)
 592                                 *(d++) = 1;
 593                         else
 594                                 *(d++) = version_minor;
 595                         s2n((int)l,d);
 596
 597                         /* number of bytes to write */
 598                         s->init_num=p-buf;
 599                         s->init_off=0;
 600
 601                         ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
 602                         }
 603
 604                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
 605                 s->init_off=0;
 606                 }
 607
 608         /* SSL3_ST_CW_CLNT_HELLO_B */
 609         ret = ssl23_write_bytes(s);
 610
 611         if ((ret >= 2) && s->msg_callback)
 612                 {
 613                 /* Client Hello has been sent; tell msg_callback */
 614
 615                 if (ssl2_compat)
 616                         s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
 617                 else
 618                         {
 619                         s->msg_callback(1, version, SSL3_RT_HEADER, s->init_buf->data, 5, s, s->msg_callback_arg);
 620                         s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
 621                         }
 622                 }
 623
 624         return ret;
 625         }
 626
 627 static int ssl23_get_server_hello(SSL *s)
 628         {
 629         char buf[8];
 630         unsigned char *p;
 631         int i;
 632         int n;
 633
 634         n=ssl23_read_bytes(s,7);
 635
 636         if (n != 7) return(n);
 637         p=s->packet;
 638
 639         memcpy(buf,p,n);
 640
 641         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 642                 (p[5] == 0x00) && (p[6] == 0x02))
 643                 {
 644 #ifdef OPENSSL_NO_SSL2
 645                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 646                 goto err;
 647 #else
 648                 /* we are talking sslv2 */
 649                 /* we need to clean up the SSLv3 setup and put in the
 650                  * sslv2 stuff. */
 651                 int ch_len;
 652
 653                 if (s->options & SSL_OP_NO_SSLv2)
 654                         {
 655                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 656                         goto err;
 657                         }
 658                 if (s->s2 == NULL)
 659                         {
 660                         if (!ssl2_new(s))
 661                                 goto err;
 662                         }
 663                 else
 664                         ssl2_clear(s);
 665
 666                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 667                         ch_len=SSL2_CHALLENGE_LENGTH;
 668                 else
 669                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 670
 671                 /* write out sslv2 challenge */
 672                 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because
 673                    it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or
 674                    SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for
 675                    futurproofing */
 676                 i=(SSL3_RANDOM_SIZE < ch_len)
 677                         ?SSL3_RANDOM_SIZE:ch_len;
 678                 s->s2->challenge_length=i;
 679                 memcpy(s->s2->challenge,
 680                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 681
 682                 if (s->s3 != NULL) ssl3_free(s);
 683
 684                 if (!BUF_MEM_grow_clean(s->init_buf,
 685                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 686                         {
 687                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
 688                         goto err;
 689                         }
 690
 691                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
 692                 if (!(s->client_version == SSL2_VERSION))
 693                         /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
 694                         s->s2->ssl2_rollback=1;
 695
 696                 /* setup the 7 bytes we have read so we get them from
 697                  * the sslv2 buffer */
 698                 s->rstate=SSL_ST_READ_HEADER;
 699                 s->packet_length=n;
 700                 s->packet= &(s->s2->rbuf[0]);
 701                 memcpy(s->packet,buf,n);
 702                 s->s2->rbuf_left=n;
 703                 s->s2->rbuf_offs=0;
 704
 705                 /* we have already written one */
 706                 s->s2->write_sequence=1;
 707
 708                 s->method=SSLv2_client_method();
 709                 s->handshake_func=s->method->ssl_connect;
 710 #endif
 711                 }
 712         else if (p[1] == SSL3_VERSION_MAJOR &&
 713                  p[2] <= TLS1_2_VERSION_MINOR &&
 714                  ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
 715                   (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2)))
 716                 {
 717                 /* we have sslv3 or tls1 (server hello or alert) */
 718
 719 #ifndef OPENSSL_NO_SSL3
 720                 if ((p[2] == SSL3_VERSION_MINOR) &&
 721                         !(s->options & SSL_OP_NO_SSLv3))
 722                         {
 723 #ifdef OPENSSL_FIPS
 724                         if(FIPS_mode())
 725                                 {
 726                                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
 727                                         SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
 728                                 goto err;
 729                                 }
 730 #endif
 731                         s->version=SSL3_VERSION;
 732                         s->method=SSLv3_client_method();
 733                         }
 734                 else
 735 #endif
 736                 if ((p[2] == TLS1_VERSION_MINOR) &&
 737                         !(s->options & SSL_OP_NO_TLSv1))
 738                         {
 739                         s->version=TLS1_VERSION;
 740                         s->method=TLSv1_client_method();
 741                         }
 742                 else if ((p[2] == TLS1_1_VERSION_MINOR) &&
 743                         !(s->options & SSL_OP_NO_TLSv1_1))
 744                         {
 745                         s->version=TLS1_1_VERSION;
 746                         s->method=TLSv1_1_client_method();
 747                         }
 748                 else if ((p[2] == TLS1_2_VERSION_MINOR) &&
 749                         !(s->options & SSL_OP_NO_TLSv1_2))
 750                         {
 751                         s->version=TLS1_2_VERSION;
 752                         s->method=TLSv1_2_client_method();
 753                         }
 754                 else
 755                         {
 756                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 757                         goto err;
 758                         }
 759
 760                 /* ensure that TLS_MAX_VERSION is up-to-date */
 761                 OPENSSL_assert(s->version <= TLS_MAX_VERSION);
 762
 763                 if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL))
 764                         {
 765                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_VERSION_TOO_LOW);
 766                         goto err;
 767                         }
 768
 769                 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING)
 770                         {
 771                         /* fatal alert */
 772
 773                         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 774                         int j;
 775
 776                         if (s->info_callback != NULL)
 777                                 cb=s->info_callback;
 778                         else if (s->ctx->info_callback != NULL)
 779                                 cb=s->ctx->info_callback;
 780
 781                         i=p[5];
 782                         if (cb != NULL)
 783                                 {
 784                                 j=(i<<8)|p[6];
 785                                 cb(s,SSL_CB_READ_ALERT,j);
 786                                 }
 787
 788                         if (s->msg_callback)
 789                                 {
 790                                 s->msg_callback(0, s->version, SSL3_RT_HEADER, p, 5, s, s->msg_callback_arg);
 791                                 s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg);
 792                                 }
 793
 794                         s->rwstate=SSL_NOTHING;
 795                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
 796                         goto err;
 797                         }
 798
 799                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 800
 801                 /* we are in this state */
 802                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 803
 804                 /* put the 7 bytes we have read into the input buffer
 805                  * for SSLv3 */
 806                 s->rstate=SSL_ST_READ_HEADER;
 807                 s->packet_length=n;
 808                 if (s->s3->rbuf.buf == NULL)
 809                         if (!ssl3_setup_read_buffer(s))
 810                                 goto err;
 811                 s->packet= &(s->s3->rbuf.buf[0]);
 812                 memcpy(s->packet,buf,n);
 813                 s->s3->rbuf.left=n;
 814                 s->s3->rbuf.offset=0;
 815
 816                 s->handshake_func=s->method->ssl_connect;
 817                 }
 818         else
 819                 {
 820                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 821                 goto err;
 822                 }
 823         s->init_num=0;
 824
 825         /* Since, if we are sending a ssl23 client hello, we are not
 826          * reusing a session-id */
 827         if (!ssl_get_new_session(s,0))
 828                 goto err;
 829
 830         return(SSL_connect(s));
 831 err:
 832         return(-1);
 833         }