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 SSL_METHOD *ssl23_get_client_method(int ver);
  70 static int ssl23_client_hello(SSL *s);
  71 static int ssl23_get_server_hello(SSL *s);
  72 #else
  73 static SSL_METHOD *ssl23_get_client_method();
  74 static int ssl23_client_hello();
  75 static int ssl23_get_server_hello();
  76 #endif
  77
  78 static SSL_METHOD *ssl23_get_client_method(ver)
  79 int ver;
  80         {
  81         if (ver == SSL2_VERSION)
  82                 return(SSLv2_client_method());
  83         else if (ver == SSL3_VERSION)
  84                 return(SSLv3_client_method());
  85         else if (ver == TLS1_VERSION)
  86                 return(TLSv1_client_method());
  87         else
  88                 return(NULL);
  89         }
  90
  91 SSL_METHOD *SSLv23_client_method()
  92         {
  93         static int init=1;
  94         static SSL_METHOD SSLv23_client_data;
  95
  96         if (init)
  97                 {
  98                 init=0;
  99                 memcpy((char *)&SSLv23_client_data,
 100                         (char *)sslv23_base_method(),sizeof(SSL_METHOD));
 101                 SSLv23_client_data.ssl_connect=ssl23_connect;
 102                 SSLv23_client_data.get_ssl_method=ssl23_get_client_method;
 103                 }
 104         return(&SSLv23_client_data);
 105         }
 106
 107 int ssl23_connect(s)
 108 SSL *s;
 109         {
 110         BUF_MEM *buf;
 111         unsigned long Time=time(NULL);
 112         void (*cb)()=NULL;
 113         int ret= -1;
 114         int new_state,state;
 115
 116         RAND_seed(&Time,sizeof(Time));
 117         ERR_clear_error();
 118         clear_sys_error();
 119
 120         if (s->info_callback != NULL)
 121                 cb=s->info_callback;
 122         else if (s->ctx->info_callback != NULL)
 123                 cb=s->ctx->info_callback;
 124
 125         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 126         s->in_handshake++;
 127
 128         for (;;)
 129                 {
 130                 state=s->state;
 131
 132                 switch(s->state)
 133                         {
 134                 case SSL_ST_BEFORE:
 135                 case SSL_ST_CONNECT:
 136                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 137                 case SSL_ST_OK|SSL_ST_CONNECT:
 138
 139                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 140
 141                         /* s->version=TLS1_VERSION; */
 142                         s->type=SSL_ST_CONNECT;
 143
 144                         if (s->init_buf == NULL)
 145                                 {
 146                                 if ((buf=BUF_MEM_new()) == NULL)
 147                                         {
 148                                         ret= -1;
 149                                         goto end;
 150                                         }
 151                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 152                                         {
 153                                         ret= -1;
 154                                         goto end;
 155                                         }
 156                                 s->init_buf=buf;
 157                                 }
 158
 159                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 160
 161                         ssl3_init_finished_mac(s);
 162
 163                         s->state=SSL23_ST_CW_CLNT_HELLO_A;
 164                         s->ctx->sess_connect++;
 165                         s->init_num=0;
 166                         break;
 167
 168                 case SSL23_ST_CW_CLNT_HELLO_A:
 169                 case SSL23_ST_CW_CLNT_HELLO_B:
 170
 171                         s->shutdown=0;
 172                         ret=ssl23_client_hello(s);
 173                         if (ret <= 0) goto end;
 174                         s->state=SSL23_ST_CR_SRVR_HELLO_A;
 175                         s->init_num=0;
 176
 177                         break;
 178
 179                 case SSL23_ST_CR_SRVR_HELLO_A:
 180                 case SSL23_ST_CR_SRVR_HELLO_B:
 181                         ret=ssl23_get_server_hello(s);
 182                         if (ret >= 0) cb=NULL;
 183                         goto end;
 184                         /* break; */
 185
 186                 default:
 187                         SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
 188                         ret= -1;
 189                         goto end;
 190                         /* break; */
 191                         }
 192
 193                 if (s->debug) BIO_flush(s->wbio);
 194
 195                 if ((cb != NULL) && (s->state != state))
 196                         {
 197                         new_state=s->state;
 198                         s->state=state;
 199                         cb(s,SSL_CB_CONNECT_LOOP,1);
 200                         s->state=new_state;
 201                         }
 202                 }
 203 end:
 204         s->in_handshake--;
 205         if (cb != NULL)
 206                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 207         return(ret);
 208         }
 209
 210
 211 static int ssl23_client_hello(s)
 212 SSL *s;
 213         {
 214         unsigned char *buf;
 215         unsigned char *p,*d;
 216         int i,ch_len;
 217
 218         buf=(unsigned char *)s->init_buf->data;
 219         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 220                 {
 221 #if 0
 222                 /* don't reuse session-id's */
 223                 if (!ssl_get_new_session(s,0))
 224                         {
 225                         return(-1);
 226                         }
 227 #endif
 228
 229                 p=s->s3->client_random;
 230                 RAND_bytes(p,SSL3_RANDOM_SIZE);
 231
 232                 /* Do the message type and length last */
 233                 d= &(buf[2]);
 234                 p=d+9;
 235
 236                 *(d++)=SSL2_MT_CLIENT_HELLO;
 237                 if (!(s->options & SSL_OP_NO_TLSv1))
 238                         {
 239                         *(d++)=TLS1_VERSION_MAJOR;
 240                         *(d++)=TLS1_VERSION_MINOR;
 241                         }
 242                 else if (!(s->options & SSL_OP_NO_SSLv3))
 243                         {
 244                         *(d++)=SSL3_VERSION_MAJOR;
 245                         *(d++)=SSL3_VERSION_MINOR;
 246                         }
 247                 else if (!(s->options & SSL_OP_NO_SSLv2))
 248                         {
 249                         *(d++)=SSL2_VERSION_MAJOR;
 250                         *(d++)=SSL2_VERSION_MINOR;
 251                         }
 252                 else
 253                         {
 254                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
 255                         return(-1);
 256                         }
 257
 258                 /* Ciphers supported */
 259                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p);
 260                 if (i == 0)
 261                         {
 262                         /* no ciphers */
 263                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 264                         return(-1);
 265                         }
 266                 s2n(i,d);
 267                 p+=i;
 268
 269                 /* put in the session-id, zero since there is no
 270                  * reuse. */
 271 #if 0
 272                 s->session->session_id_length=0;
 273 #endif
 274                 s2n(0,d);
 275
 276                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 277                         ch_len=SSL2_CHALLENGE_LENGTH;
 278                 else
 279                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 280
 281                 /* write out sslv2 challenge */
 282                 if (SSL3_RANDOM_SIZE < ch_len)
 283                         i=SSL3_RANDOM_SIZE;
 284                 else
 285                         i=ch_len;
 286                 s2n(i,d);
 287                 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
 288                 RAND_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 289                 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 290                 p+=i;
 291
 292                 i= p- &(buf[2]);
 293                 buf[0]=((i>>8)&0xff)|0x80;
 294                 buf[1]=(i&0xff);
 295
 296                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
 297                 /* number of bytes to write */
 298                 s->init_num=i+2;
 299                 s->init_off=0;
 300
 301                 ssl3_finish_mac(s,&(buf[2]),i);
 302                 }
 303
 304         /* SSL3_ST_CW_CLNT_HELLO_B */
 305         return(ssl23_write_bytes(s));
 306         }
 307
 308 static int ssl23_get_server_hello(s)
 309 SSL *s;
 310         {
 311         char buf[8];
 312         unsigned char *p;
 313         int i,ch_len;
 314         int n;
 315
 316         n=ssl23_read_bytes(s,7);
 317
 318         if (n != 7) return(n);
 319         p=s->packet;
 320
 321         memcpy(buf,p,n);
 322
 323         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 324                 (p[5] == 0x00) && (p[6] == 0x02))
 325                 {
 326                 /* we are talking sslv2 */
 327                 /* we need to clean up the SSLv3 setup and put in the
 328                  * sslv2 stuff. */
 329
 330                 if (s->options & SSL_OP_NO_SSLv2)
 331                         {
 332                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 333                         goto err;
 334                         }
 335                 if (s->s2 == NULL)
 336                         {
 337                         if (!ssl2_new(s))
 338                                 goto err;
 339                         }
 340                 else
 341                         ssl2_clear(s);
 342
 343                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 344                         ch_len=SSL2_CHALLENGE_LENGTH;
 345                 else
 346                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 347
 348                 /* write out sslv2 challenge */
 349                 i=(SSL3_RANDOM_SIZE < ch_len)
 350                         ?SSL3_RANDOM_SIZE:ch_len;
 351                 s->s2->challenge_length=i;
 352                 memcpy(s->s2->challenge,
 353                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 354
 355                 if (s->s3 != NULL) ssl3_free(s);
 356
 357                 if (!BUF_MEM_grow(s->init_buf,
 358                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 359                         {
 360                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
 361                         goto err;
 362                         }
 363
 364                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
 365                 s->s2->ssl2_rollback=1;
 366
 367                 /* setup the 5 bytes we have read so we get them from
 368                  * the sslv2 buffer */
 369                 s->rstate=SSL_ST_READ_HEADER;
 370                 s->packet_length=n;
 371                 s->packet= &(s->s2->rbuf[0]);
 372                 memcpy(s->packet,buf,n);
 373                 s->s2->rbuf_left=n;
 374                 s->s2->rbuf_offs=0;
 375
 376                 /* we have already written one */
 377                 s->s2->write_sequence=1;
 378
 379                 s->method=SSLv2_client_method();
 380                 s->handshake_func=s->method->ssl_connect;
 381                 }
 382         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 383                  (p[1] == SSL3_VERSION_MAJOR) &&
 384                  ((p[2] == SSL3_VERSION_MINOR) ||
 385                   (p[2] == TLS1_VERSION_MINOR)) &&
 386                  (p[5] == SSL3_MT_SERVER_HELLO))
 387                 {
 388                 /* we have sslv3 or tls1 */
 389
 390                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 391
 392                 /* we are in this state */
 393                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 394
 395                 /* put the 5 bytes we have read into the input buffer
 396                  * for SSLv3 */
 397                 s->rstate=SSL_ST_READ_HEADER;
 398                 s->packet_length=n;
 399                 s->packet= &(s->s3->rbuf.buf[0]);
 400                 memcpy(s->packet,buf,n);
 401                 s->s3->rbuf.left=n;
 402                 s->s3->rbuf.offset=0;
 403
 404                 if ((p[2] == SSL3_VERSION_MINOR) &&
 405                         !(s->options & SSL_OP_NO_SSLv3))
 406                         {
 407                         s->version=SSL3_VERSION;
 408                         s->method=SSLv3_client_method();
 409                         }
 410                 else if ((p[2] == TLS1_VERSION_MINOR) &&
 411                         !(s->options & SSL_OP_NO_TLSv1))
 412                         {
 413                         s->version=TLS1_VERSION;
 414                         s->method=TLSv1_client_method();
 415                         }
 416                 else
 417                         {
 418                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 419                         goto err;
 420                         }
 421
 422                 s->handshake_func=s->method->ssl_connect;
 423                 }
 424         else if ((p[0] == SSL3_RT_ALERT) &&
 425                  (p[1] == SSL3_VERSION_MAJOR) &&
 426                  ((p[2] == SSL3_VERSION_MINOR) ||
 427                   (p[2] == TLS1_VERSION_MINOR)) &&
 428                  (p[3] == 0) &&
 429                  (p[4] == 2))
 430                 {
 431                 void (*cb)()=NULL;
 432                 int j;
 433
 434                 /* An alert */
 435                 if (s->info_callback != NULL)
 436                         cb=s->info_callback;
 437                 else if (s->ctx->info_callback != NULL)
 438                         cb=s->ctx->info_callback;
 439
 440                 i=p[5];
 441                 if (cb != NULL)
 442                         {
 443                         j=(i<<8)|p[6];
 444                         cb(s,SSL_CB_READ_ALERT,j);
 445                         }
 446
 447                 s->rwstate=SSL_NOTHING;
 448                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
 449                 goto err;
 450                 }
 451         else
 452                 {
 453                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 454                 goto err;
 455                 }
 456         s->init_num=0;
 457
 458         /* Since, if we are sending a ssl23 client hello, we are not
 459          * reusing a session-id */
 460         if (!ssl_get_new_session(s,0))
 461                 goto err;
 462
 463         s->first_packet=1;
 464         return(SSL_connect(s));
 465 err:
 466         return(-1);
 467         }
 468