crypto/openssl/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  * $FreeBSD$
  59  */
  60
  61 #include <stdio.h>
  62 #include <openssl/buffer.h>
  63 #include <openssl/rand.h>
  64 #include <openssl/objects.h>
  65 #include <openssl/evp.h>
  66 #include "ssl_locl.h"
  67
  68 static SSL_METHOD *ssl23_get_client_method(int ver);
  69 static int ssl23_client_hello(SSL *s);
  70 static int ssl23_get_server_hello(SSL *s);
  71 static SSL_METHOD *ssl23_get_client_method(int ver)
  72         {
  73 #ifndef NO_SSL2
  74         if (ver == SSL2_VERSION)
  75                 return(SSLv2_client_method());
  76 #endif
  77         if (ver == SSL3_VERSION)
  78                 return(SSLv3_client_method());
  79         else if (ver == TLS1_VERSION)
  80                 return(TLSv1_client_method());
  81         else
  82                 return(NULL);
  83         }
  84
  85 SSL_METHOD *SSLv23_client_method(void)
  86         {
  87         static int init=1;
  88         static SSL_METHOD SSLv23_client_data;
  89
  90         if (init)
  91                 {
  92                 memcpy((char *)&SSLv23_client_data,
  93                         (char *)sslv23_base_method(),sizeof(SSL_METHOD));
  94                 SSLv23_client_data.ssl_connect=ssl23_connect;
  95                 SSLv23_client_data.get_ssl_method=ssl23_get_client_method;
  96                 init=0;
  97                 }
  98         return(&SSLv23_client_data);
  99         }
 100
 101 int ssl23_connect(SSL *s)
 102         {
 103         BUF_MEM *buf;
 104         unsigned long Time=time(NULL);
 105         void (*cb)()=NULL;
 106         int ret= -1;
 107         int new_state,state;
 108
 109         RAND_seed(&Time,sizeof(Time));
 110         ERR_clear_error();
 111         clear_sys_error();
 112
 113         if (s->info_callback != NULL)
 114                 cb=s->info_callback;
 115         else if (s->ctx->info_callback != NULL)
 116                 cb=s->ctx->info_callback;
 117
 118         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 119         s->in_handshake++;
 120
 121         for (;;)
 122                 {
 123                 state=s->state;
 124
 125                 switch(s->state)
 126                         {
 127                 case SSL_ST_BEFORE:
 128                 case SSL_ST_CONNECT:
 129                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 130                 case SSL_ST_OK|SSL_ST_CONNECT:
 131
 132                         if (s->session != NULL)
 133                                 {
 134                                 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
 135                                 ret= -1;
 136                                 goto end;
 137                                 }
 138                         s->server=0;
 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->stats.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) { (void)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(SSL *s)
 212         {
 213         unsigned char *buf;
 214         unsigned char *p,*d;
 215         int i,ch_len;
 216
 217         buf=(unsigned char *)s->init_buf->data;
 218         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 219                 {
 220 #if 0
 221                 /* don't reuse session-id's */
 222                 if (!ssl_get_new_session(s,0))
 223                         {
 224                         return(-1);
 225                         }
 226 #endif
 227
 228                 p=s->s3->client_random;
 229                 RAND_bytes(p,SSL3_RANDOM_SIZE);
 230
 231                 /* Do the message type and length last */
 232                 d= &(buf[2]);
 233                 p=d+9;
 234
 235                 *(d++)=SSL2_MT_CLIENT_HELLO;
 236                 if (!(s->options & SSL_OP_NO_TLSv1))
 237                         {
 238                         *(d++)=TLS1_VERSION_MAJOR;
 239                         *(d++)=TLS1_VERSION_MINOR;
 240                         s->client_version=TLS1_VERSION;
 241                         }
 242                 else if (!(s->options & SSL_OP_NO_SSLv3))
 243                         {
 244                         *(d++)=SSL3_VERSION_MAJOR;
 245                         *(d++)=SSL3_VERSION_MINOR;
 246                         s->client_version=SSL3_VERSION;
 247                         }
 248                 else if (!(s->options & SSL_OP_NO_SSLv2))
 249                         {
 250                         *(d++)=SSL2_VERSION_MAJOR;
 251                         *(d++)=SSL2_VERSION_MINOR;
 252                         s->client_version=SSL2_VERSION;
 253                         }
 254                 else
 255                         {
 256                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
 257                         return(-1);
 258                         }
 259
 260                 /* Ciphers supported */
 261                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p);
 262                 if (i == 0)
 263                         {
 264                         /* no ciphers */
 265                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 266                         return(-1);
 267                         }
 268                 s2n(i,d);
 269                 p+=i;
 270
 271                 /* put in the session-id, zero since there is no
 272                  * reuse. */
 273 #if 0
 274                 s->session->session_id_length=0;
 275 #endif
 276                 s2n(0,d);
 277
 278                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 279                         ch_len=SSL2_CHALLENGE_LENGTH;
 280                 else
 281                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 282
 283                 /* write out sslv2 challenge */
 284                 if (SSL3_RANDOM_SIZE < ch_len)
 285                         i=SSL3_RANDOM_SIZE;
 286                 else
 287                         i=ch_len;
 288                 s2n(i,d);
 289                 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
 290                 RAND_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 291                 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 292                 p+=i;
 293
 294                 i= p- &(buf[2]);
 295                 buf[0]=((i>>8)&0xff)|0x80;
 296                 buf[1]=(i&0xff);
 297
 298                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
 299                 /* number of bytes to write */
 300                 s->init_num=i+2;
 301                 s->init_off=0;
 302
 303                 ssl3_finish_mac(s,&(buf[2]),i);
 304                 }
 305
 306         /* SSL3_ST_CW_CLNT_HELLO_B */
 307         return(ssl23_write_bytes(s));
 308         }
 309
 310 static int ssl23_get_server_hello(SSL *s)
 311         {
 312         char buf[8];
 313         unsigned char *p;
 314         int i,ch_len;
 315         int n;
 316
 317         n=ssl23_read_bytes(s,7);
 318
 319         if (n != 7) return(n);
 320         p=s->packet;
 321
 322         memcpy(buf,p,n);
 323
 324         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 325                 (p[5] == 0x00) && (p[6] == 0x02))
 326                 {
 327 #ifdef NO_SSL2
 328                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 329                         goto err;
 330 #else
 331                 /* we are talking sslv2 */
 332                 /* we need to clean up the SSLv3 setup and put in the
 333                  * sslv2 stuff. */
 334
 335                 if (s->options & SSL_OP_NO_SSLv2)
 336                         {
 337                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 338                         goto err;
 339                         }
 340                 if (s->s2 == NULL)
 341                         {
 342                         if (!ssl2_new(s))
 343                                 goto err;
 344                         }
 345                 else
 346                         ssl2_clear(s);
 347
 348                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 349                         ch_len=SSL2_CHALLENGE_LENGTH;
 350                 else
 351                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 352
 353                 /* write out sslv2 challenge */
 354                 i=(SSL3_RANDOM_SIZE < ch_len)
 355                         ?SSL3_RANDOM_SIZE:ch_len;
 356                 s->s2->challenge_length=i;
 357                 memcpy(s->s2->challenge,
 358                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 359
 360                 if (s->s3 != NULL) ssl3_free(s);
 361
 362                 if (!BUF_MEM_grow(s->init_buf,
 363                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 364                         {
 365                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
 366                         goto err;
 367                         }
 368
 369                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
 370                 s->s2->ssl2_rollback=1;
 371
 372                 /* setup the 5 bytes we have read so we get them from
 373                  * the sslv2 buffer */
 374                 s->rstate=SSL_ST_READ_HEADER;
 375                 s->packet_length=n;
 376                 s->packet= &(s->s2->rbuf[0]);
 377                 memcpy(s->packet,buf,n);
 378                 s->s2->rbuf_left=n;
 379                 s->s2->rbuf_offs=0;
 380
 381                 /* we have already written one */
 382                 s->s2->write_sequence=1;
 383
 384                 s->method=SSLv2_client_method();
 385                 s->handshake_func=s->method->ssl_connect;
 386 #endif
 387                 }
 388         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 389                  (p[1] == SSL3_VERSION_MAJOR) &&
 390                  ((p[2] == SSL3_VERSION_MINOR) ||
 391                   (p[2] == TLS1_VERSION_MINOR)) &&
 392                  (p[5] == SSL3_MT_SERVER_HELLO))
 393                 {
 394                 /* we have sslv3 or tls1 */
 395
 396                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 397
 398                 /* we are in this state */
 399                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 400
 401                 /* put the 5 bytes we have read into the input buffer
 402                  * for SSLv3 */
 403                 s->rstate=SSL_ST_READ_HEADER;
 404                 s->packet_length=n;
 405                 s->packet= &(s->s3->rbuf.buf[0]);
 406                 memcpy(s->packet,buf,n);
 407                 s->s3->rbuf.left=n;
 408                 s->s3->rbuf.offset=0;
 409
 410                 if ((p[2] == SSL3_VERSION_MINOR) &&
 411                         !(s->options & SSL_OP_NO_SSLv3))
 412                         {
 413                         s->version=SSL3_VERSION;
 414                         s->method=SSLv3_client_method();
 415                         }
 416                 else if ((p[2] == TLS1_VERSION_MINOR) &&
 417                         !(s->options & SSL_OP_NO_TLSv1))
 418                         {
 419                         s->version=TLS1_VERSION;
 420                         s->method=TLSv1_client_method();
 421                         }
 422                 else
 423                         {
 424                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 425                         goto err;
 426                         }
 427
 428                 s->handshake_func=s->method->ssl_connect;
 429                 }
 430         else if ((p[0] == SSL3_RT_ALERT) &&
 431                  (p[1] == SSL3_VERSION_MAJOR) &&
 432                  ((p[2] == SSL3_VERSION_MINOR) ||
 433                   (p[2] == TLS1_VERSION_MINOR)) &&
 434                  (p[3] == 0) &&
 435                  (p[4] == 2))
 436                 {
 437                 void (*cb)()=NULL;
 438                 int j;
 439
 440                 /* An alert */
 441                 if (s->info_callback != NULL)
 442                         cb=s->info_callback;
 443                 else if (s->ctx->info_callback != NULL)
 444                         cb=s->ctx->info_callback;
 445
 446                 i=p[5];
 447                 if (cb != NULL)
 448                         {
 449                         j=(i<<8)|p[6];
 450                         cb(s,SSL_CB_READ_ALERT,j);
 451                         }
 452
 453                 s->rwstate=SSL_NOTHING;
 454                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
 455                 goto err;
 456                 }
 457         else
 458                 {
 459                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 460                 goto err;
 461                 }
 462         s->init_num=0;
 463
 464         /* Since, if we are sending a ssl23 client hello, we are not
 465          * reusing a session-id */
 466         if (!ssl_get_new_session(s,0))
 467                 goto err;
 468
 469         s->first_packet=1;
 470         return(SSL_connect(s));
 471 err:
 472         return(-1);
 473         }
 474