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 SSL_METHOD *SSLv23_client_method(void)
  84         {
  85         static int init=1;
  86         static SSL_METHOD SSLv23_client_data;
  87
  88         if (init)
  89                 {
  90                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
  91
  92                 if (init)
  93                         {
  94                         memcpy((char *)&SSLv23_client_data,
  95                                 (char *)sslv23_base_method(),sizeof(SSL_METHOD));
  96                         SSLv23_client_data.ssl_connect=ssl23_connect;
  97                         SSLv23_client_data.get_ssl_method=ssl23_get_client_method;
  98                         init=0;
  99                         }
 100
 101                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 102                 }
 103         return(&SSLv23_client_data);
 104         }
 105
 106 int ssl23_connect(SSL *s)
 107         {
 108         BUF_MEM *buf=NULL;
 109         unsigned long Time=time(NULL);
 110         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 111         int ret= -1;
 112         int new_state,state;
 113
 114         RAND_add(&Time,sizeof(Time),0);
 115         ERR_clear_error();
 116         clear_sys_error();
 117
 118         if (s->info_callback != NULL)
 119                 cb=s->info_callback;
 120         else if (s->ctx->info_callback != NULL)
 121                 cb=s->ctx->info_callback;
 122
 123         s->in_handshake++;
 124         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 125
 126         for (;;)
 127                 {
 128                 state=s->state;
 129
 130                 switch(s->state)
 131                         {
 132                 case SSL_ST_BEFORE:
 133                 case SSL_ST_CONNECT:
 134                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 135                 case SSL_ST_OK|SSL_ST_CONNECT:
 136
 137                         if (s->session != NULL)
 138                                 {
 139                                 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
 140                                 ret= -1;
 141                                 goto end;
 142                                 }
 143                         s->server=0;
 144                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 145
 146                         /* s->version=TLS1_VERSION; */
 147                         s->type=SSL_ST_CONNECT;
 148
 149                         if (s->init_buf == NULL)
 150                                 {
 151                                 if ((buf=BUF_MEM_new()) == NULL)
 152                                         {
 153                                         ret= -1;
 154                                         goto end;
 155                                         }
 156                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 157                                         {
 158                                         ret= -1;
 159                                         goto end;
 160                                         }
 161                                 s->init_buf=buf;
 162                                 buf=NULL;
 163                                 }
 164
 165                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 166
 167                         ssl3_init_finished_mac(s);
 168
 169                         s->state=SSL23_ST_CW_CLNT_HELLO_A;
 170                         s->ctx->stats.sess_connect++;
 171                         s->init_num=0;
 172                         break;
 173
 174                 case SSL23_ST_CW_CLNT_HELLO_A:
 175                 case SSL23_ST_CW_CLNT_HELLO_B:
 176
 177                         s->shutdown=0;
 178                         ret=ssl23_client_hello(s);
 179                         if (ret <= 0) goto end;
 180                         s->state=SSL23_ST_CR_SRVR_HELLO_A;
 181                         s->init_num=0;
 182
 183                         break;
 184
 185                 case SSL23_ST_CR_SRVR_HELLO_A:
 186                 case SSL23_ST_CR_SRVR_HELLO_B:
 187                         ret=ssl23_get_server_hello(s);
 188                         if (ret >= 0) cb=NULL;
 189                         goto end;
 190                         /* break; */
 191
 192                 default:
 193                         SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
 194                         ret= -1;
 195                         goto end;
 196                         /* break; */
 197                         }
 198
 199                 if (s->debug) { (void)BIO_flush(s->wbio); }
 200
 201                 if ((cb != NULL) && (s->state != state))
 202                         {
 203                         new_state=s->state;
 204                         s->state=state;
 205                         cb(s,SSL_CB_CONNECT_LOOP,1);
 206                         s->state=new_state;
 207                         }
 208                 }
 209 end:
 210         s->in_handshake--;
 211         if (buf != NULL)
 212                 BUF_MEM_free(buf);
 213         if (cb != NULL)
 214                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 215         return(ret);
 216         }
 217
 218
 219 static int ssl23_client_hello(SSL *s)
 220         {
 221         unsigned char *buf;
 222         unsigned char *p,*d;
 223         int i,j,ch_len;
 224         unsigned long Time,l;
 225         int ssl2_compat;
 226         int version = 0, version_major, version_minor;
 227         SSL_COMP *comp;
 228         int ret;
 229
 230         ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
 231
 232         if (!(s->options & SSL_OP_NO_TLSv1))
 233                 {
 234                 version = TLS1_VERSION;
 235                 }
 236         else if (!(s->options & SSL_OP_NO_SSLv3))
 237                 {
 238                 version = SSL3_VERSION;
 239                 }
 240         else if (!(s->options & SSL_OP_NO_SSLv2))
 241                 {
 242                 version = SSL2_VERSION;
 243                 }
 244
 245         buf=(unsigned char *)s->init_buf->data;
 246         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 247                 {
 248 #if 0
 249                 /* don't reuse session-id's */
 250                 if (!ssl_get_new_session(s,0))
 251                         {
 252                         return(-1);
 253                         }
 254 #endif
 255
 256                 p=s->s3->client_random;
 257                 Time=time(NULL);                        /* Time */
 258                 l2n(Time,p);
 259                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 260                         return -1;
 261
 262                 if (version == TLS1_VERSION)
 263                         {
 264                         version_major = TLS1_VERSION_MAJOR;
 265                         version_minor = TLS1_VERSION_MINOR;
 266                         }
 267                 else if (version == SSL3_VERSION)
 268                         {
 269                         version_major = SSL3_VERSION_MAJOR;
 270                         version_minor = SSL3_VERSION_MINOR;
 271                         }
 272                 else if (version == SSL2_VERSION)
 273                         {
 274                         version_major = SSL2_VERSION_MAJOR;
 275                         version_minor = SSL2_VERSION_MINOR;
 276                         }
 277                 else
 278                         {
 279                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
 280                         return(-1);
 281                         }
 282
 283                 s->client_version = version;
 284
 285                 if (ssl2_compat)
 286                         {
 287                         /* create SSL 2.0 compatible Client Hello */
 288
 289                         /* two byte record header will be written last */
 290                         d = &(buf[2]);
 291                         p = d + 9; /* leave space for message type, version, individual length fields */
 292
 293                         *(d++) = SSL2_MT_CLIENT_HELLO;
 294                         *(d++) = version_major;
 295                         *(d++) = version_minor;
 296
 297                         /* Ciphers supported */
 298                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
 299                         if (i == 0)
 300                                 {
 301                                 /* no ciphers */
 302                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 303                                 return -1;
 304                                 }
 305                         s2n(i,d);
 306                         p+=i;
 307
 308                         /* put in the session-id length (zero since there is no reuse) */
 309 #if 0
 310                         s->session->session_id_length=0;
 311 #endif
 312                         s2n(0,d);
 313
 314                         if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 315                                 ch_len=SSL2_CHALLENGE_LENGTH;
 316                         else
 317                                 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 318
 319                         /* write out sslv2 challenge */
 320                         if (SSL3_RANDOM_SIZE < ch_len)
 321                                 i=SSL3_RANDOM_SIZE;
 322                         else
 323                                 i=ch_len;
 324                         s2n(i,d);
 325                         memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
 326                         if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
 327                                 return -1;
 328
 329                         memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 330                         p+=i;
 331
 332                         i= p- &(buf[2]);
 333                         buf[0]=((i>>8)&0xff)|0x80;
 334                         buf[1]=(i&0xff);
 335
 336                         /* number of bytes to write */
 337                         s->init_num=i+2;
 338                         s->init_off=0;
 339
 340                         ssl3_finish_mac(s,&(buf[2]),i);
 341                         }
 342                 else
 343                         {
 344                         /* create Client Hello in SSL 3.0/TLS 1.0 format */
 345
 346                         /* do the record header (5 bytes) and handshake message header (4 bytes) last */
 347                         d = p = &(buf[9]);
 348
 349                         *(p++) = version_major;
 350                         *(p++) = version_minor;
 351
 352                         /* Random stuff */
 353                         memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
 354                         p += SSL3_RANDOM_SIZE;
 355
 356                         /* Session ID (zero since there is no reuse) */
 357                         *(p++) = 0;
 358
 359                         /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
 360                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
 361                         if (i == 0)
 362                                 {
 363                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 364                                 return -1;
 365                                 }
 366                         s2n(i,p);
 367                         p+=i;
 368
 369                         /* COMPRESSION */
 370                         if (s->ctx->comp_methods == NULL)
 371                                 j=0;
 372                         else
 373                                 j=sk_SSL_COMP_num(s->ctx->comp_methods);
 374                         *(p++)=1+j;
 375                         for (i=0; i<j; i++)
 376                                 {
 377                                 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 378                                 *(p++)=comp->id;
 379                                 }
 380                         *(p++)=0; /* Add the NULL method */
 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, 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         s->first_packet=1;
 596         return(SSL_connect(s));
 597 err:
 598         return(-1);
 599         }
 600