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 "buffer.h"
  61 #include "rand.h"
  62 #include "objects.h"
  63 #include "evp.h"
  64 #include "ssl_locl.h"
  65
  66 #define BREAK break
  67
  68 #ifndef NOPROTO
  69 static int ssl23_client_hello(SSL *s);
  70 static int ssl23_get_server_hello(SSL *s);
  71 #else
  72 static int ssl23_client_hello();
  73 static int ssl23_get_server_hello();
  74 #endif
  75
  76 static SSL_METHOD *ssl23_get_client_method(ver)
  77 int ver;
  78         {
  79         if (ver == SSL2_VERSION)
  80                 return(SSLv2_client_method());
  81         else if (ver == SSL3_VERSION)
  82                 return(SSLv3_client_method());
  83         else if (ver == TLS1_VERSION)
  84                 return(TLSv1_client_method());
  85         else
  86                 return(NULL);
  87         }
  88
  89 SSL_METHOD *SSLv23_client_method()
  90         {
  91         static int init=1;
  92         static SSL_METHOD SSLv23_client_data;
  93
  94         if (init)
  95                 {
  96                 init=0;
  97                 memcpy((char *)&SSLv23_client_data,
  98                         (char *)sslv23_base_method(),sizeof(SSL_METHOD));
  99                 SSLv23_client_data.ssl_connect=ssl23_connect;
 100                 SSLv23_client_data.get_ssl_method=ssl23_get_client_method;
 101                 }
 102         return(&SSLv23_client_data);
 103         }
 104
 105 int ssl23_connect(s)
 106 SSL *s;
 107         {
 108         BUF_MEM *buf;
 109         unsigned long Time=time(NULL);
 110         void (*cb)()=NULL;
 111         int ret= -1;
 112         int new_state,state;
 113
 114         RAND_seed((unsigned char *)&Time,sizeof(Time));
 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         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 124         s->in_handshake++;
 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 (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->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) 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(s)
 210 SSL *s;
 211         {
 212         unsigned char *buf;
 213         unsigned char *p,*d;
 214         int i,ch_len;
 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_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                         }
 240                 else if (!(s->options & SSL_OP_NO_SSLv3))
 241                         {
 242                         *(d++)=SSL3_VERSION_MAJOR;
 243                         *(d++)=SSL3_VERSION_MINOR;
 244                         }
 245                 else if (!(s->options & SSL_OP_NO_SSLv2))
 246                         {
 247                         *(d++)=SSL2_VERSION_MAJOR;
 248                         *(d++)=SSL2_VERSION_MINOR;
 249                         }
 250                 else
 251                         {
 252                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
 253                         return(-1);
 254                         }
 255
 256                 /* Ciphers supported */
 257                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p);
 258                 if (i == 0)
 259                         {
 260                         /* no ciphers */
 261                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 262                         return(-1);
 263                         }
 264                 s2n(i,d);
 265                 p+=i;
 266
 267                 /* put in the session-id, zero since there is no
 268                  * reuse. */
 269 #if 0
 270                 s->session->session_id_length=0;
 271 #endif
 272                 s2n(0,d);
 273
 274                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 275                         ch_len=SSL2_CHALLENGE_LENGTH;
 276                 else
 277                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 278
 279                 /* write out sslv2 challenge */
 280                 if (SSL3_RANDOM_SIZE < ch_len)
 281                         i=SSL3_RANDOM_SIZE;
 282                 else
 283                         i=ch_len;
 284                 s2n(i,d);
 285                 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
 286                 RAND_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 287                 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 288                 p+=i;
 289
 290                 i= p- &(buf[2]);
 291                 buf[0]=((i>>8)&0xff)|0x80;
 292                 buf[1]=(i&0xff);
 293
 294                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
 295                 /* number of bytes to write */
 296                 s->init_num=i+2;
 297                 s->init_off=0;
 298
 299                 ssl3_finish_mac(s,&(buf[2]),i);
 300                 }
 301
 302         /* SSL3_ST_CW_CLNT_HELLO_B */
 303         return(ssl23_write_bytes(s));
 304         }
 305
 306 static int ssl23_get_server_hello(s)
 307 SSL *s;
 308         {
 309         char buf[8];
 310         unsigned char *p;
 311         int i,ch_len;
 312         int n;
 313
 314         n=ssl23_read_bytes(s,7);
 315
 316         if (n != 7) return(n);
 317         p=s->packet;
 318
 319         memcpy(buf,p,n);
 320
 321         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 322                 (p[5] == 0x00) && (p[6] == 0x02))
 323                 {
 324                 /* we are talking sslv2 */
 325                 /* we need to clean up the SSLv3 setup and put in the
 326                  * sslv2 stuff. */
 327
 328                 if (s->options & SSL_OP_NO_SSLv2)
 329                         {
 330                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 331                         goto err;
 332                         }
 333                 if (s->s2 == NULL)
 334                         {
 335                         if (!ssl2_new(s))
 336                                 goto err;
 337                         }
 338                 else
 339                         ssl2_clear(s);
 340
 341                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 342                         ch_len=SSL2_CHALLENGE_LENGTH;
 343                 else
 344                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 345
 346                 /* write out sslv2 challenge */
 347                 i=(SSL3_RANDOM_SIZE < ch_len)
 348                         ?SSL3_RANDOM_SIZE:ch_len;
 349                 s->s2->challenge_length=i;
 350                 memcpy(s->s2->challenge,
 351                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 352
 353                 if (s->s3 != NULL) ssl3_free(s);
 354
 355                 if (!BUF_MEM_grow(s->init_buf,
 356                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 357                         {
 358                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
 359                         goto err;
 360                         }
 361
 362                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
 363                 s->s2->ssl2_rollback=1;
 364
 365                 /* setup the 5 bytes we have read so we get them from
 366                  * the sslv2 buffer */
 367                 s->rstate=SSL_ST_READ_HEADER;
 368                 s->packet_length=n;
 369                 s->packet= &(s->s2->rbuf[0]);
 370                 memcpy(s->packet,buf,n);
 371                 s->s2->rbuf_left=n;
 372                 s->s2->rbuf_offs=0;
 373
 374                 /* we have already written one */
 375                 s->s2->write_sequence=1;
 376
 377                 s->method=SSLv2_client_method();
 378                 s->handshake_func=s->method->ssl_connect;
 379                 }
 380         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 381                  (p[1] == SSL3_VERSION_MAJOR) &&
 382                  ((p[2] == SSL3_VERSION_MINOR) ||
 383                   (p[2] == TLS1_VERSION_MINOR)) &&
 384                  (p[5] == SSL3_MT_SERVER_HELLO))
 385                 {
 386                 /* we have sslv3 or tls1 */
 387
 388                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 389
 390                 /* we are in this state */
 391                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 392
 393                 /* put the 5 bytes we have read into the input buffer
 394                  * for SSLv3 */
 395                 s->rstate=SSL_ST_READ_HEADER;
 396                 s->packet_length=n;
 397                 s->packet= &(s->s3->rbuf.buf[0]);
 398                 memcpy(s->packet,buf,n);
 399                 s->s3->rbuf.left=n;
 400                 s->s3->rbuf.offset=0;
 401
 402                 if ((p[2] == SSL3_VERSION_MINOR) &&
 403                         !(s->options & SSL_OP_NO_SSLv3))
 404                         {
 405                         s->version=SSL3_VERSION;
 406                         s->method=SSLv3_client_method();
 407                         }
 408                 else if ((p[2] == TLS1_VERSION_MINOR) &&
 409                         !(s->options & SSL_OP_NO_TLSv1))
 410                         {
 411                         s->version=TLS1_VERSION;
 412                         s->method=TLSv1_client_method();
 413                         }
 414                 else
 415                         {
 416                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 417                         goto err;
 418                         }
 419
 420                 s->handshake_func=s->method->ssl_connect;
 421                 }
 422         else if ((p[0] == SSL3_RT_ALERT) &&
 423                  (p[1] == SSL3_VERSION_MAJOR) &&
 424                  ((p[2] == SSL3_VERSION_MINOR) ||
 425                   (p[2] == TLS1_VERSION_MINOR)) &&
 426                  (p[3] == 0) &&
 427                  (p[4] == 2))
 428                 {
 429                 void (*cb)()=NULL;
 430                 int j;
 431
 432                 /* An alert */
 433                 if (s->info_callback != NULL)
 434                         cb=s->info_callback;
 435                 else if (s->ctx->info_callback != NULL)
 436                         cb=s->ctx->info_callback;
 437
 438                 i=p[5];
 439                 if (cb != NULL)
 440                         {
 441                         j=(i<<8)|p[6];
 442                         cb(s,SSL_CB_READ_ALERT,j);
 443                         }
 444
 445                 s->rwstate=SSL_NOTHING;
 446                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
 447                 goto err;
 448                 }
 449         else
 450                 {
 451                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 452                 goto err;
 453                 }
 454         s->init_num=0;
 455
 456         /* Since, if we are sending a ssl23 client hello, we are not
 457          * reusing a session-id */
 458         if (!ssl_get_new_session(s,0))
 459                 goto err;
 460
 461         s->first_packet=1;
 462         return(SSL_connect(s));
 463 err:
 464         return(-1);
 465         }
 466