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 <openssl/buffer.h>
  61 #include <openssl/rand.h>
  62 #include <openssl/objects.h>
  63 #include <openssl/evp.h>
  64 #include "ssl_locl.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                 memcpy((char *)&SSLv23_client_data,
  91                         (char *)sslv23_base_method(),sizeof(SSL_METHOD));
  92                 SSLv23_client_data.ssl_connect=ssl23_connect;
  93                 SSLv23_client_data.get_ssl_method=ssl23_get_client_method;
  94                 init=0;
  95                 }
  96         return(&SSLv23_client_data);
  97         }
  98
  99 int ssl23_connect(SSL *s)
 100         {
 101         BUF_MEM *buf;
 102         unsigned long Time=time(NULL);
 103         void (*cb)()=NULL;
 104         int ret= -1;
 105         int new_state,state;
 106
 107         RAND_add(&Time,sizeof(Time),0);
 108         ERR_clear_error();
 109         clear_sys_error();
 110
 111         if (s->info_callback != NULL)
 112                 cb=s->info_callback;
 113         else if (s->ctx->info_callback != NULL)
 114                 cb=s->ctx->info_callback;
 115
 116         s->in_handshake++;
 117         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 118
 119         for (;;)
 120                 {
 121                 state=s->state;
 122
 123                 switch(s->state)
 124                         {
 125                 case SSL_ST_BEFORE:
 126                 case SSL_ST_CONNECT:
 127                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 128                 case SSL_ST_OK|SSL_ST_CONNECT:
 129
 130                         if (s->session != NULL)
 131                                 {
 132                                 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
 133                                 ret= -1;
 134                                 goto end;
 135                                 }
 136                         s->server=0;
 137                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 138
 139                         /* s->version=TLS1_VERSION; */
 140                         s->type=SSL_ST_CONNECT;
 141
 142                         if (s->init_buf == NULL)
 143                                 {
 144                                 if ((buf=BUF_MEM_new()) == NULL)
 145                                         {
 146                                         ret= -1;
 147                                         goto end;
 148                                         }
 149                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 150                                         {
 151                                         ret= -1;
 152                                         goto end;
 153                                         }
 154                                 s->init_buf=buf;
 155                                 }
 156
 157                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 158
 159                         ssl3_init_finished_mac(s);
 160
 161                         s->state=SSL23_ST_CW_CLNT_HELLO_A;
 162                         s->ctx->stats.sess_connect++;
 163                         s->init_num=0;
 164                         break;
 165
 166                 case SSL23_ST_CW_CLNT_HELLO_A:
 167                 case SSL23_ST_CW_CLNT_HELLO_B:
 168
 169                         s->shutdown=0;
 170                         ret=ssl23_client_hello(s);
 171                         if (ret <= 0) goto end;
 172                         s->state=SSL23_ST_CR_SRVR_HELLO_A;
 173                         s->init_num=0;
 174
 175                         break;
 176
 177                 case SSL23_ST_CR_SRVR_HELLO_A:
 178                 case SSL23_ST_CR_SRVR_HELLO_B:
 179                         ret=ssl23_get_server_hello(s);
 180                         if (ret >= 0) cb=NULL;
 181                         goto end;
 182                         /* break; */
 183
 184                 default:
 185                         SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
 186                         ret= -1;
 187                         goto end;
 188                         /* break; */
 189                         }
 190
 191                 if (s->debug) { (void)BIO_flush(s->wbio); }
 192
 193                 if ((cb != NULL) && (s->state != state))
 194                         {
 195                         new_state=s->state;
 196                         s->state=state;
 197                         cb(s,SSL_CB_CONNECT_LOOP,1);
 198                         s->state=new_state;
 199                         }
 200                 }
 201 end:
 202         s->in_handshake--;
 203         if (cb != NULL)
 204                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 205         return(ret);
 206         }
 207
 208
 209 static int ssl23_client_hello(SSL *s)
 210         {
 211         unsigned char *buf;
 212         unsigned char *p,*d;
 213         int i,ch_len;
 214         int ret;
 215
 216         buf=(unsigned char *)s->init_buf->data;
 217         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 218                 {
 219 #if 0
 220                 /* don't reuse session-id's */
 221                 if (!ssl_get_new_session(s,0))
 222                         {
 223                         return(-1);
 224                         }
 225 #endif
 226
 227                 p=s->s3->client_random;
 228                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE);
 229
 230                 /* Do the message type and length last */
 231                 d= &(buf[2]);
 232                 p=d+9;
 233
 234                 *(d++)=SSL2_MT_CLIENT_HELLO;
 235                 if (!(s->options & SSL_OP_NO_TLSv1))
 236                         {
 237                         *(d++)=TLS1_VERSION_MAJOR;
 238                         *(d++)=TLS1_VERSION_MINOR;
 239                         s->client_version=TLS1_VERSION;
 240                         }
 241                 else if (!(s->options & SSL_OP_NO_SSLv3))
 242                         {
 243                         *(d++)=SSL3_VERSION_MAJOR;
 244                         *(d++)=SSL3_VERSION_MINOR;
 245                         s->client_version=SSL3_VERSION;
 246                         }
 247                 else if (!(s->options & SSL_OP_NO_SSLv2))
 248                         {
 249                         *(d++)=SSL2_VERSION_MAJOR;
 250                         *(d++)=SSL2_VERSION_MINOR;
 251                         s->client_version=SSL2_VERSION;
 252                         }
 253                 else
 254                         {
 255                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
 256                         return(-1);
 257                         }
 258
 259                 /* Ciphers supported */
 260                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p);
 261                 if (i == 0)
 262                         {
 263                         /* no ciphers */
 264                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 265                         return(-1);
 266                         }
 267                 s2n(i,d);
 268                 p+=i;
 269
 270                 /* put in the session-id, zero since there is no
 271                  * reuse. */
 272 #if 0
 273                 s->session->session_id_length=0;
 274 #endif
 275                 s2n(0,d);
 276
 277                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 278                         ch_len=SSL2_CHALLENGE_LENGTH;
 279                 else
 280                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 281
 282                 /* write out sslv2 challenge */
 283                 if (SSL3_RANDOM_SIZE < ch_len)
 284                         i=SSL3_RANDOM_SIZE;
 285                 else
 286                         i=ch_len;
 287                 s2n(i,d);
 288                 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
 289                 RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 290                 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 291                 p+=i;
 292
 293                 i= p- &(buf[2]);
 294                 buf[0]=((i>>8)&0xff)|0x80;
 295                 buf[1]=(i&0xff);
 296
 297                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
 298                 /* number of bytes to write */
 299                 s->init_num=i+2;
 300                 s->init_off=0;
 301
 302                 ssl3_finish_mac(s,&(buf[2]),i);
 303                 }
 304
 305         /* SSL3_ST_CW_CLNT_HELLO_B */
 306         ret = ssl23_write_bytes(s);
 307         if (ret >= 2)
 308                 if (s->msg_callback)
 309                         s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
 310         return ret;
 311         }
 312
 313 static int ssl23_get_server_hello(SSL *s)
 314         {
 315         char buf[8];
 316         unsigned char *p;
 317         int i;
 318         int n;
 319
 320         n=ssl23_read_bytes(s,7);
 321
 322         if (n != 7) return(n);
 323         p=s->packet;
 324
 325         memcpy(buf,p,n);
 326
 327         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 328                 (p[5] == 0x00) && (p[6] == 0x02))
 329                 {
 330 #ifdef OPENSSL_NO_SSL2
 331                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 332                 goto err;
 333 #else
 334                 /* we are talking sslv2 */
 335                 /* we need to clean up the SSLv3 setup and put in the
 336                  * sslv2 stuff. */
 337                 int ch_len;
 338
 339                 if (s->options & SSL_OP_NO_SSLv2)
 340                         {
 341                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 342                         goto err;
 343                         }
 344                 if (s->s2 == NULL)
 345                         {
 346                         if (!ssl2_new(s))
 347                                 goto err;
 348                         }
 349                 else
 350                         ssl2_clear(s);
 351
 352                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 353                         ch_len=SSL2_CHALLENGE_LENGTH;
 354                 else
 355                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 356
 357                 /* write out sslv2 challenge */
 358                 i=(SSL3_RANDOM_SIZE < ch_len)
 359                         ?SSL3_RANDOM_SIZE:ch_len;
 360                 s->s2->challenge_length=i;
 361                 memcpy(s->s2->challenge,
 362                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 363
 364                 if (s->s3 != NULL) ssl3_free(s);
 365
 366                 if (!BUF_MEM_grow(s->init_buf,
 367                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 368                         {
 369                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
 370                         goto err;
 371                         }
 372
 373                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
 374                 if (!(s->client_version == SSL2_VERSION))
 375                         /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
 376                         s->s2->ssl2_rollback=1;
 377
 378                 /* setup the 5 bytes we have read so we get them from
 379                  * the sslv2 buffer */
 380                 s->rstate=SSL_ST_READ_HEADER;
 381                 s->packet_length=n;
 382                 s->packet= &(s->s2->rbuf[0]);
 383                 memcpy(s->packet,buf,n);
 384                 s->s2->rbuf_left=n;
 385                 s->s2->rbuf_offs=0;
 386
 387                 /* we have already written one */
 388                 s->s2->write_sequence=1;
 389
 390                 s->method=SSLv2_client_method();
 391                 s->handshake_func=s->method->ssl_connect;
 392 #endif
 393                 }
 394         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 395                  (p[1] == SSL3_VERSION_MAJOR) &&
 396                  ((p[2] == SSL3_VERSION_MINOR) ||
 397                   (p[2] == TLS1_VERSION_MINOR)) &&
 398                  (p[5] == SSL3_MT_SERVER_HELLO))
 399                 {
 400                 /* we have sslv3 or tls1 */
 401
 402                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 403
 404                 /* we are in this state */
 405                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 406
 407                 /* put the 5 bytes we have read into the input buffer
 408                  * for SSLv3 */
 409                 s->rstate=SSL_ST_READ_HEADER;
 410                 s->packet_length=n;
 411                 s->packet= &(s->s3->rbuf.buf[0]);
 412                 memcpy(s->packet,buf,n);
 413                 s->s3->rbuf.left=n;
 414                 s->s3->rbuf.offset=0;
 415
 416                 if ((p[2] == SSL3_VERSION_MINOR) &&
 417                         !(s->options & SSL_OP_NO_SSLv3))
 418                         {
 419                         s->version=SSL3_VERSION;
 420                         s->method=SSLv3_client_method();
 421                         }
 422                 else if ((p[2] == TLS1_VERSION_MINOR) &&
 423                         !(s->options & SSL_OP_NO_TLSv1))
 424                         {
 425                         s->version=TLS1_VERSION;
 426                         s->method=TLSv1_client_method();
 427                         }
 428                 else
 429                         {
 430                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 431                         goto err;
 432                         }
 433
 434                 s->handshake_func=s->method->ssl_connect;
 435                 }
 436         else if ((p[0] == SSL3_RT_ALERT) &&
 437                  (p[1] == SSL3_VERSION_MAJOR) &&
 438                  ((p[2] == SSL3_VERSION_MINOR) ||
 439                   (p[2] == TLS1_VERSION_MINOR)) &&
 440                  (p[3] == 0) &&
 441                  (p[4] == 2))
 442                 {
 443                 void (*cb)()=NULL;
 444                 int j;
 445
 446                 /* An alert */
 447                 if (s->info_callback != NULL)
 448                         cb=s->info_callback;
 449                 else if (s->ctx->info_callback != NULL)
 450                         cb=s->ctx->info_callback;
 451
 452                 i=p[5];
 453                 if (cb != NULL)
 454                         {
 455                         j=(i<<8)|p[6];
 456                         cb(s,SSL_CB_READ_ALERT,j);
 457                         }
 458
 459                 s->rwstate=SSL_NOTHING;
 460                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
 461                 goto err;
 462                 }
 463         else
 464                 {
 465                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 466                 goto err;
 467                 }
 468         s->init_num=0;
 469
 470         /* Since, if we are sending a ssl23 client hello, we are not
 471          * reusing a session-id */
 472         if (!ssl_get_new_session(s,0))
 473                 goto err;
 474
 475         s->first_packet=1;
 476         return(SSL_connect(s));
 477 err:
 478         return(-1);
 479         }
 480