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=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
 227         buf=(unsigned char *)s->init_buf->data;
 228         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 229                 {
 230 #if 0
 231                 /* don't reuse session-id's */
 232                 if (!ssl_get_new_session(s,0))
 233                         {
 234                         return(-1);
 235                         }
 236 #endif
 237
 238                 p=s->s3->client_random;
 239                 Time=time(NULL);                        /* Time */
 240                 l2n(Time,p);
 241                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 242                         return -1;
 243
 244                 if (version == TLS1_VERSION)
 245                         {
 246                         version_major = TLS1_VERSION_MAJOR;
 247                         version_minor = TLS1_VERSION_MINOR;
 248                         }
 249                 else if (version == SSL3_VERSION)
 250                         {
 251                         version_major = SSL3_VERSION_MAJOR;
 252                         version_minor = SSL3_VERSION_MINOR;
 253                         }
 254                 else if (version == SSL2_VERSION)
 255                         {
 256                         version_major = SSL2_VERSION_MAJOR;
 257                         version_minor = SSL2_VERSION_MINOR;
 258                         }
 259                 else
 260                         {
 261                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
 262                         return(-1);
 263                         }
 264
 265                 s->client_version = version;
 266
 267                 if (ssl2_compat)
 268                         {
 269                         /* create SSL 2.0 compatible Client Hello */
 270
 271                         /* two byte record header will be written last */
 272                         d = &(buf[2]);
 273                         p = d + 9; /* leave space for message type, version, individual length fields */
 274
 275                         *(d++) = SSL2_MT_CLIENT_HELLO;
 276                         *(d++) = version_major;
 277                         *(d++) = version_minor;
 278
 279                         /* Ciphers supported */
 280                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
 281                         if (i == 0)
 282                                 {
 283                                 /* no ciphers */
 284                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 285                                 return -1;
 286                                 }
 287                         s2n(i,d);
 288                         p+=i;
 289
 290                         /* put in the session-id length (zero since there is no reuse) */
 291 #if 0
 292                         s->session->session_id_length=0;
 293 #endif
 294                         s2n(0,d);
 295
 296                         if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 297                                 ch_len=SSL2_CHALLENGE_LENGTH;
 298                         else
 299                                 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 300
 301                         /* write out sslv2 challenge */
 302                         if (SSL3_RANDOM_SIZE < ch_len)
 303                                 i=SSL3_RANDOM_SIZE;
 304                         else
 305                                 i=ch_len;
 306                         s2n(i,d);
 307                         memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
 308                         if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
 309                                 return -1;
 310
 311                         memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 312                         p+=i;
 313
 314                         i= p- &(buf[2]);
 315                         buf[0]=((i>>8)&0xff)|0x80;
 316                         buf[1]=(i&0xff);
 317
 318                         /* number of bytes to write */
 319                         s->init_num=i+2;
 320                         s->init_off=0;
 321
 322                         ssl3_finish_mac(s,&(buf[2]),i);
 323                         }
 324                 else
 325                         {
 326                         /* create Client Hello in SSL 3.0/TLS 1.0 format */
 327
 328                         /* do the record header (5 bytes) and handshake message header (4 bytes) last */
 329                         d = p = &(buf[9]);
 330
 331                         *(p++) = version_major;
 332                         *(p++) = version_minor;
 333
 334                         /* Random stuff */
 335                         memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
 336                         p += SSL3_RANDOM_SIZE;
 337
 338                         /* Session ID (zero since there is no reuse) */
 339                         *(p++) = 0;
 340
 341                         /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
 342                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
 343                         if (i == 0)
 344                                 {
 345                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 346                                 return -1;
 347                                 }
 348                         s2n(i,p);
 349                         p+=i;
 350
 351                         /* COMPRESSION */
 352                         if (s->ctx->comp_methods == NULL)
 353                                 j=0;
 354                         else
 355                                 j=sk_SSL_COMP_num(s->ctx->comp_methods);
 356                         *(p++)=1+j;
 357                         for (i=0; i<j; i++)
 358                                 {
 359                                 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 360                                 *(p++)=comp->id;
 361                                 }
 362                         *(p++)=0; /* Add the NULL method */
 363
 364                         l = p-d;
 365                         *p = 42;
 366
 367                         /* fill in 4-byte handshake header */
 368                         d=&(buf[5]);
 369                         *(d++)=SSL3_MT_CLIENT_HELLO;
 370                         l2n3(l,d);
 371
 372                         l += 4;
 373
 374                         if (l > SSL3_RT_MAX_PLAIN_LENGTH)
 375                                 {
 376                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 377                                 return -1;
 378                                 }
 379
 380                         /* fill in 5-byte record header */
 381                         d=buf;
 382                         *(d++) = SSL3_RT_HANDSHAKE;
 383                         *(d++) = version_major;
 384                         *(d++) = version_minor; /* arguably we should send the *lowest* suported version here
 385                                                  * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
 386                         s2n((int)l,d);
 387
 388                         /* number of bytes to write */
 389                         s->init_num=p-buf;
 390                         s->init_off=0;
 391
 392                         ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
 393                         }
 394
 395                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
 396                 s->init_off=0;
 397                 }
 398
 399         /* SSL3_ST_CW_CLNT_HELLO_B */
 400         ret = ssl23_write_bytes(s);
 401
 402         if ((ret >= 2) && s->msg_callback)
 403                 {
 404                 /* Client Hello has been sent; tell msg_callback */
 405
 406                 if (ssl2_compat)
 407                         s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
 408                 else
 409                         s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
 410                 }
 411
 412         return ret;
 413         }
 414
 415 static int ssl23_get_server_hello(SSL *s)
 416         {
 417         char buf[8];
 418         unsigned char *p;
 419         int i;
 420         int n;
 421
 422         n=ssl23_read_bytes(s,7);
 423
 424         if (n != 7) return(n);
 425         p=s->packet;
 426
 427         memcpy(buf,p,n);
 428
 429         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 430                 (p[5] == 0x00) && (p[6] == 0x02))
 431                 {
 432 #ifdef OPENSSL_NO_SSL2
 433                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 434                 goto err;
 435 #else
 436                 /* we are talking sslv2 */
 437                 /* we need to clean up the SSLv3 setup and put in the
 438                  * sslv2 stuff. */
 439                 int ch_len;
 440
 441                 if (s->options & SSL_OP_NO_SSLv2)
 442                         {
 443                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 444                         goto err;
 445                         }
 446                 if (s->s2 == NULL)
 447                         {
 448                         if (!ssl2_new(s))
 449                                 goto err;
 450                         }
 451                 else
 452                         ssl2_clear(s);
 453
 454                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 455                         ch_len=SSL2_CHALLENGE_LENGTH;
 456                 else
 457                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 458
 459                 /* write out sslv2 challenge */
 460                 i=(SSL3_RANDOM_SIZE < ch_len)
 461                         ?SSL3_RANDOM_SIZE:ch_len;
 462                 s->s2->challenge_length=i;
 463                 memcpy(s->s2->challenge,
 464                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 465
 466                 if (s->s3 != NULL) ssl3_free(s);
 467
 468                 if (!BUF_MEM_grow_clean(s->init_buf,
 469                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 470                         {
 471                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
 472                         goto err;
 473                         }
 474
 475                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
 476                 if (!(s->client_version == SSL2_VERSION))
 477                         /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
 478                         s->s2->ssl2_rollback=1;
 479
 480                 /* setup the 5 bytes we have read so we get them from
 481                  * the sslv2 buffer */
 482                 s->rstate=SSL_ST_READ_HEADER;
 483                 s->packet_length=n;
 484                 s->packet= &(s->s2->rbuf[0]);
 485                 memcpy(s->packet,buf,n);
 486                 s->s2->rbuf_left=n;
 487                 s->s2->rbuf_offs=0;
 488
 489                 /* we have already written one */
 490                 s->s2->write_sequence=1;
 491
 492                 s->method=SSLv2_client_method();
 493                 s->handshake_func=s->method->ssl_connect;
 494 #endif
 495                 }
 496         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 497                  (p[1] == SSL3_VERSION_MAJOR) &&
 498                  ((p[2] == SSL3_VERSION_MINOR) ||
 499                   (p[2] == TLS1_VERSION_MINOR)) &&
 500                  (p[5] == SSL3_MT_SERVER_HELLO))
 501                 {
 502                 /* we have sslv3 or tls1 */
 503
 504                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 505
 506                 /* we are in this state */
 507                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 508
 509                 /* put the 5 bytes we have read into the input buffer
 510                  * for SSLv3 */
 511                 s->rstate=SSL_ST_READ_HEADER;
 512                 s->packet_length=n;
 513                 s->packet= &(s->s3->rbuf.buf[0]);
 514                 memcpy(s->packet,buf,n);
 515                 s->s3->rbuf.left=n;
 516                 s->s3->rbuf.offset=0;
 517
 518                 if ((p[2] == SSL3_VERSION_MINOR) &&
 519                         !(s->options & SSL_OP_NO_SSLv3))
 520                         {
 521                         s->version=SSL3_VERSION;
 522                         s->method=SSLv3_client_method();
 523                         }
 524                 else if ((p[2] == TLS1_VERSION_MINOR) &&
 525                         !(s->options & SSL_OP_NO_TLSv1))
 526                         {
 527                         s->version=TLS1_VERSION;
 528                         s->method=TLSv1_client_method();
 529                         }
 530                 else
 531                         {
 532                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 533                         goto err;
 534                         }
 535
 536                 s->handshake_func=s->method->ssl_connect;
 537                 }
 538         else if ((p[0] == SSL3_RT_ALERT) &&
 539                  (p[1] == SSL3_VERSION_MAJOR) &&
 540                  ((p[2] == SSL3_VERSION_MINOR) ||
 541                   (p[2] == TLS1_VERSION_MINOR)) &&
 542                  (p[3] == 0) &&
 543                  (p[4] == 2))
 544                 {
 545                 void (*cb)(const SSL *ssl,int type,int val)=NULL;
 546                 int j;
 547
 548                 /* An alert */
 549                 if (s->info_callback != NULL)
 550                         cb=s->info_callback;
 551                 else if (s->ctx->info_callback != NULL)
 552                         cb=s->ctx->info_callback;
 553
 554                 i=p[5];
 555                 if (cb != NULL)
 556                         {
 557                         j=(i<<8)|p[6];
 558                         cb(s,SSL_CB_READ_ALERT,j);
 559                         }
 560
 561                 s->rwstate=SSL_NOTHING;
 562                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
 563                 goto err;
 564                 }
 565         else
 566                 {
 567                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 568                 goto err;
 569                 }
 570         s->init_num=0;
 571
 572         /* Since, if we are sending a ssl23 client hello, we are not
 573          * reusing a session-id */
 574         if (!ssl_get_new_session(s,0))
 575                 goto err;
 576
 577         s->first_packet=1;
 578         return(SSL_connect(s));
 579 err:
 580         return(-1);
 581         }
 582