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