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         if (ver == SSL2_VERSION)
  72                 return(SSLv2_client_method());
  73         if (ver == SSL3_VERSION)
  74                 return(SSLv3_client_method());
  75         else if (ver == TLS1_VERSION)
  76                 return(TLSv1_client_method());
  77         else
  78                 return(NULL);
  79         }
  80
  81 SSL_METHOD *SSLv23_client_method(void)
  82         {
  83         static int init=1;
  84         static SSL_METHOD SSLv23_client_data;
  85
  86         if (init)
  87                 {
  88                 memcpy((char *)&SSLv23_client_data,
  89                         (char *)sslv23_base_method(),sizeof(SSL_METHOD));
  90                 SSLv23_client_data.ssl_connect=ssl23_connect;
  91                 SSLv23_client_data.get_ssl_method=ssl23_get_client_method;
  92                 init=0;
  93                 }
  94         return(&SSLv23_client_data);
  95         }
  96
  97 int ssl23_connect(SSL *s)
  98         {
  99         BUF_MEM *buf;
 100         unsigned long Time=time(NULL);
 101         void (*cb)()=NULL;
 102         int ret= -1;
 103         int new_state,state;
 104
 105         RAND_seed(&Time,sizeof(Time));
 106         ERR_clear_error();
 107         clear_sys_error();
 108
 109         if (s->info_callback != NULL)
 110                 cb=s->info_callback;
 111         else if (s->ctx->info_callback != NULL)
 112                 cb=s->ctx->info_callback;
 113
 114         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 115         s->in_handshake++;
 116
 117         for (;;)
 118                 {
 119                 state=s->state;
 120
 121                 switch(s->state)
 122                         {
 123                 case SSL_ST_BEFORE:
 124                 case SSL_ST_CONNECT:
 125                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 126                 case SSL_ST_OK|SSL_ST_CONNECT:
 127
 128                         if (s->session != NULL)
 129                                 {
 130                                 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
 131                                 ret= -1;
 132                                 goto end;
 133                                 }
 134                         s->server=0;
 135                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 136
 137                         /* s->version=TLS1_VERSION; */
 138                         s->type=SSL_ST_CONNECT;
 139
 140                         if (s->init_buf == NULL)
 141                                 {
 142                                 if ((buf=BUF_MEM_new()) == NULL)
 143                                         {
 144                                         ret= -1;
 145                                         goto end;
 146                                         }
 147                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 148                                         {
 149                                         ret= -1;
 150                                         goto end;
 151                                         }
 152                                 s->init_buf=buf;
 153                                 }
 154
 155                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 156
 157                         ssl3_init_finished_mac(s);
 158
 159                         s->state=SSL23_ST_CW_CLNT_HELLO_A;
 160                         s->ctx->stats.sess_connect++;
 161                         s->init_num=0;
 162                         break;
 163
 164                 case SSL23_ST_CW_CLNT_HELLO_A:
 165                 case SSL23_ST_CW_CLNT_HELLO_B:
 166
 167                         s->shutdown=0;
 168                         ret=ssl23_client_hello(s);
 169                         if (ret <= 0) goto end;
 170                         s->state=SSL23_ST_CR_SRVR_HELLO_A;
 171                         s->init_num=0;
 172
 173                         break;
 174
 175                 case SSL23_ST_CR_SRVR_HELLO_A:
 176                 case SSL23_ST_CR_SRVR_HELLO_B:
 177                         ret=ssl23_get_server_hello(s);
 178                         if (ret >= 0) cb=NULL;
 179                         goto end;
 180                         /* break; */
 181
 182                 default:
 183                         SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
 184                         ret= -1;
 185                         goto end;
 186                         /* break; */
 187                         }
 188
 189                 if (s->debug) { (void)BIO_flush(s->wbio); }
 190
 191                 if ((cb != NULL) && (s->state != state))
 192                         {
 193                         new_state=s->state;
 194                         s->state=state;
 195                         cb(s,SSL_CB_CONNECT_LOOP,1);
 196                         s->state=new_state;
 197                         }
 198                 }
 199 end:
 200         s->in_handshake--;
 201         if (cb != NULL)
 202                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 203         return(ret);
 204         }
 205
 206
 207 static int ssl23_client_hello(SSL *s)
 208         {
 209         unsigned char *buf;
 210         unsigned char *p,*d;
 211         int i,ch_len;
 212
 213         buf=(unsigned char *)s->init_buf->data;
 214         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 215                 {
 216 #if 0
 217                 /* don't reuse session-id's */
 218                 if (!ssl_get_new_session(s,0))
 219                         {
 220                         return(-1);
 221                         }
 222 #endif
 223
 224                 p=s->s3->client_random;
 225                 RAND_bytes(p,SSL3_RANDOM_SIZE);
 226
 227                 /* Do the message type and length last */
 228                 d= &(buf[2]);
 229                 p=d+9;
 230
 231                 *(d++)=SSL2_MT_CLIENT_HELLO;
 232                 if (!(s->options & SSL_OP_NO_TLSv1))
 233                         {
 234                         *(d++)=TLS1_VERSION_MAJOR;
 235                         *(d++)=TLS1_VERSION_MINOR;
 236                         s->client_version=TLS1_VERSION;
 237                         }
 238                 else if (!(s->options & SSL_OP_NO_SSLv3))
 239                         {
 240                         *(d++)=SSL3_VERSION_MAJOR;
 241                         *(d++)=SSL3_VERSION_MINOR;
 242                         s->client_version=SSL3_VERSION;
 243                         }
 244                 else if (!(s->options & SSL_OP_NO_SSLv2))
 245                         {
 246                         *(d++)=SSL2_VERSION_MAJOR;
 247                         *(d++)=SSL2_VERSION_MINOR;
 248                         s->client_version=SSL2_VERSION;
 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(SSL *s)
 307         {
 308         char buf[8];
 309         unsigned char *p;
 310         int i,ch_len;
 311         int n;
 312
 313         n=ssl23_read_bytes(s,7);
 314
 315         if (n != 7) return(n);
 316         p=s->packet;
 317
 318         memcpy(buf,p,n);
 319
 320         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 321                 (p[5] == 0x00) && (p[6] == 0x02))
 322                 {
 323                 /* we are talking sslv2 */
 324                 /* we need to clean up the SSLv3 setup and put in the
 325                  * sslv2 stuff. */
 326
 327                 if (s->options & SSL_OP_NO_SSLv2)
 328                         {
 329                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 330                         goto err;
 331                         }
 332                 if (s->s2 == NULL)
 333                         {
 334                         if (!ssl2_new(s))
 335                                 goto err;
 336                         }
 337                 else
 338                         ssl2_clear(s);
 339
 340                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 341                         ch_len=SSL2_CHALLENGE_LENGTH;
 342                 else
 343                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 344
 345                 /* write out sslv2 challenge */
 346                 i=(SSL3_RANDOM_SIZE < ch_len)
 347                         ?SSL3_RANDOM_SIZE:ch_len;
 348                 s->s2->challenge_length=i;
 349                 memcpy(s->s2->challenge,
 350                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 351
 352                 if (s->s3 != NULL) ssl3_free(s);
 353
 354                 if (!BUF_MEM_grow(s->init_buf,
 355                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 356                         {
 357                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
 358                         goto err;
 359                         }
 360
 361                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
 362                 s->s2->ssl2_rollback=1;
 363
 364                 /* setup the 5 bytes we have read so we get them from
 365                  * the sslv2 buffer */
 366                 s->rstate=SSL_ST_READ_HEADER;
 367                 s->packet_length=n;
 368                 s->packet= &(s->s2->rbuf[0]);
 369                 memcpy(s->packet,buf,n);
 370                 s->s2->rbuf_left=n;
 371                 s->s2->rbuf_offs=0;
 372
 373                 /* we have already written one */
 374                 s->s2->write_sequence=1;
 375
 376                 s->method=SSLv2_client_method();
 377                 s->handshake_func=s->method->ssl_connect;
 378                 }
 379         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 380                  (p[1] == SSL3_VERSION_MAJOR) &&
 381                  ((p[2] == SSL3_VERSION_MINOR) ||
 382                   (p[2] == TLS1_VERSION_MINOR)) &&
 383                  (p[5] == SSL3_MT_SERVER_HELLO))
 384                 {
 385                 /* we have sslv3 or tls1 */
 386
 387                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 388
 389                 /* we are in this state */
 390                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 391
 392                 /* put the 5 bytes we have read into the input buffer
 393                  * for SSLv3 */
 394                 s->rstate=SSL_ST_READ_HEADER;
 395                 s->packet_length=n;
 396                 s->packet= &(s->s3->rbuf.buf[0]);
 397                 memcpy(s->packet,buf,n);
 398                 s->s3->rbuf.left=n;
 399                 s->s3->rbuf.offset=0;
 400
 401                 if ((p[2] == SSL3_VERSION_MINOR) &&
 402                         !(s->options & SSL_OP_NO_SSLv3))
 403                         {
 404                         s->version=SSL3_VERSION;
 405                         s->method=SSLv3_client_method();
 406                         }
 407                 else if ((p[2] == TLS1_VERSION_MINOR) &&
 408                         !(s->options & SSL_OP_NO_TLSv1))
 409                         {
 410                         s->version=TLS1_VERSION;
 411                         s->method=TLSv1_client_method();
 412                         }
 413                 else
 414                         {
 415                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 416                         goto err;
 417                         }
 418
 419                 s->handshake_func=s->method->ssl_connect;
 420                 }
 421         else if ((p[0] == SSL3_RT_ALERT) &&
 422                  (p[1] == SSL3_VERSION_MAJOR) &&
 423                  ((p[2] == SSL3_VERSION_MINOR) ||
 424                   (p[2] == TLS1_VERSION_MINOR)) &&
 425                  (p[3] == 0) &&
 426                  (p[4] == 2))
 427                 {
 428                 void (*cb)()=NULL;
 429                 int j;
 430
 431                 /* An alert */
 432                 if (s->info_callback != NULL)
 433                         cb=s->info_callback;
 434                 else if (s->ctx->info_callback != NULL)
 435                         cb=s->ctx->info_callback;
 436
 437                 i=p[5];
 438                 if (cb != NULL)
 439                         {
 440                         j=(i<<8)|p[6];
 441                         cb(s,SSL_CB_READ_ALERT,j);
 442                         }
 443
 444                 s->rwstate=SSL_NOTHING;
 445                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
 446                 goto err;
 447                 }
 448         else
 449                 {
 450                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 451                 goto err;
 452                 }
 453         s->init_num=0;
 454
 455         /* Since, if we are sending a ssl23 client hello, we are not
 456          * reusing a session-id */
 457         if (!ssl_get_new_session(s,0))
 458                 goto err;
 459
 460         s->first_packet=1;
 461         return(SSL_connect(s));
 462 err:
 463         return(-1);
 464         }
 465