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 "ssl_locl.h"
  61 #include <openssl/buffer.h>
  62 #include <openssl/rand.h>
  63 #include <openssl/objects.h>
  64 #include <openssl/evp.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 #ifndef OPENSSL_NO_SSL2
  72         if (ver == SSL2_VERSION)
  73                 return(SSLv2_client_method());
  74 #endif
  75         if (ver == SSL3_VERSION)
  76                 return(SSLv3_client_method());
  77         else if (ver == TLS1_VERSION)
  78                 return(TLSv1_client_method());
  79         else
  80                 return(NULL);
  81         }
  82
  83 SSL_METHOD *SSLv23_client_method(void)
  84         {
  85         static int init=1;
  86         static SSL_METHOD SSLv23_client_data;
  87
  88         if (init)
  89                 {
  90                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
  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                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
  99                 }
 100         return(&SSLv23_client_data);
 101         }
 102
 103 int ssl23_connect(SSL *s)
 104         {
 105         BUF_MEM *buf;
 106         unsigned long Time=time(NULL);
 107         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 108         int ret= -1;
 109         int new_state,state;
 110
 111         RAND_add(&Time,sizeof(Time),0);
 112         ERR_clear_error();
 113         clear_sys_error();
 114
 115         if (s->info_callback != NULL)
 116                 cb=s->info_callback;
 117         else if (s->ctx->info_callback != NULL)
 118                 cb=s->ctx->info_callback;
 119
 120         s->in_handshake++;
 121         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 122
 123         for (;;)
 124                 {
 125                 state=s->state;
 126
 127                 switch(s->state)
 128                         {
 129                 case SSL_ST_BEFORE:
 130                 case SSL_ST_CONNECT:
 131                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 132                 case SSL_ST_OK|SSL_ST_CONNECT:
 133
 134                         if (s->session != NULL)
 135                                 {
 136                                 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
 137                                 ret= -1;
 138                                 goto end;
 139                                 }
 140                         s->server=0;
 141                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 142
 143                         /* s->version=TLS1_VERSION; */
 144                         s->type=SSL_ST_CONNECT;
 145
 146                         if (s->init_buf == NULL)
 147                                 {
 148                                 if ((buf=BUF_MEM_new()) == NULL)
 149                                         {
 150                                         ret= -1;
 151                                         goto end;
 152                                         }
 153                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 154                                         {
 155                                         ret= -1;
 156                                         goto end;
 157                                         }
 158                                 s->init_buf=buf;
 159                                 }
 160
 161                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 162
 163                         ssl3_init_finished_mac(s);
 164
 165                         s->state=SSL23_ST_CW_CLNT_HELLO_A;
 166                         s->ctx->stats.sess_connect++;
 167                         s->init_num=0;
 168                         break;
 169
 170                 case SSL23_ST_CW_CLNT_HELLO_A:
 171                 case SSL23_ST_CW_CLNT_HELLO_B:
 172
 173                         s->shutdown=0;
 174                         ret=ssl23_client_hello(s);
 175                         if (ret <= 0) goto end;
 176                         s->state=SSL23_ST_CR_SRVR_HELLO_A;
 177                         s->init_num=0;
 178
 179                         break;
 180
 181                 case SSL23_ST_CR_SRVR_HELLO_A:
 182                 case SSL23_ST_CR_SRVR_HELLO_B:
 183                         ret=ssl23_get_server_hello(s);
 184                         if (ret >= 0) cb=NULL;
 185                         goto end;
 186                         /* break; */
 187
 188                 default:
 189                         SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
 190                         ret= -1;
 191                         goto end;
 192                         /* break; */
 193                         }
 194
 195                 if (s->debug) { (void)BIO_flush(s->wbio); }
 196
 197                 if ((cb != NULL) && (s->state != state))
 198                         {
 199                         new_state=s->state;
 200                         s->state=state;
 201                         cb(s,SSL_CB_CONNECT_LOOP,1);
 202                         s->state=new_state;
 203                         }
 204                 }
 205 end:
 206         s->in_handshake--;
 207         if (cb != NULL)
 208                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 209         return(ret);
 210         }
 211
 212
 213 static int ssl23_client_hello(SSL *s)
 214         {
 215         unsigned char *buf;
 216         unsigned char *p,*d;
 217         int i,ch_len;
 218         int ret;
 219
 220         buf=(unsigned char *)s->init_buf->data;
 221         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 222                 {
 223 #if 0
 224                 /* don't reuse session-id's */
 225                 if (!ssl_get_new_session(s,0))
 226                         {
 227                         return(-1);
 228                         }
 229 #endif
 230
 231                 p=s->s3->client_random;
 232                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE);
 233
 234                 /* Do the message type and length last */
 235                 d= &(buf[2]);
 236                 p=d+9;
 237
 238                 *(d++)=SSL2_MT_CLIENT_HELLO;
 239                 if (!(s->options & SSL_OP_NO_TLSv1))
 240                         {
 241                         *(d++)=TLS1_VERSION_MAJOR;
 242                         *(d++)=TLS1_VERSION_MINOR;
 243                         s->client_version=TLS1_VERSION;
 244                         }
 245                 else if (!(s->options & SSL_OP_NO_SSLv3))
 246                         {
 247                         *(d++)=SSL3_VERSION_MAJOR;
 248                         *(d++)=SSL3_VERSION_MINOR;
 249                         s->client_version=SSL3_VERSION;
 250                         }
 251                 else if (!(s->options & SSL_OP_NO_SSLv2))
 252                         {
 253                         *(d++)=SSL2_VERSION_MAJOR;
 254                         *(d++)=SSL2_VERSION_MINOR;
 255                         s->client_version=SSL2_VERSION;
 256                         }
 257                 else
 258                         {
 259                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
 260                         return(-1);
 261                         }
 262
 263                 /* Ciphers supported */
 264                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p);
 265                 if (i == 0)
 266                         {
 267                         /* no ciphers */
 268                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 269                         return(-1);
 270                         }
 271                 s2n(i,d);
 272                 p+=i;
 273
 274                 /* put in the session-id, zero since there is no
 275                  * reuse. */
 276 #if 0
 277                 s->session->session_id_length=0;
 278 #endif
 279                 s2n(0,d);
 280
 281                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 282                         ch_len=SSL2_CHALLENGE_LENGTH;
 283                 else
 284                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 285
 286                 /* write out sslv2 challenge */
 287                 if (SSL3_RANDOM_SIZE < ch_len)
 288                         i=SSL3_RANDOM_SIZE;
 289                 else
 290                         i=ch_len;
 291                 s2n(i,d);
 292                 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
 293                 RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 294                 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 295                 p+=i;
 296
 297                 i= p- &(buf[2]);
 298                 buf[0]=((i>>8)&0xff)|0x80;
 299                 buf[1]=(i&0xff);
 300
 301                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
 302                 /* number of bytes to write */
 303                 s->init_num=i+2;
 304                 s->init_off=0;
 305
 306                 ssl3_finish_mac(s,&(buf[2]),i);
 307                 }
 308
 309         /* SSL3_ST_CW_CLNT_HELLO_B */
 310         ret = ssl23_write_bytes(s);
 311         if (ret >= 2)
 312                 if (s->msg_callback)
 313                         s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
 314         return ret;
 315         }
 316
 317 static int ssl23_get_server_hello(SSL *s)
 318         {
 319         char buf[8];
 320         unsigned char *p;
 321         int i;
 322         int n;
 323
 324         n=ssl23_read_bytes(s,7);
 325
 326         if (n != 7) return(n);
 327         p=s->packet;
 328
 329         memcpy(buf,p,n);
 330
 331         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 332                 (p[5] == 0x00) && (p[6] == 0x02))
 333                 {
 334 #ifdef OPENSSL_NO_SSL2
 335                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 336                 goto err;
 337 #else
 338                 /* we are talking sslv2 */
 339                 /* we need to clean up the SSLv3 setup and put in the
 340                  * sslv2 stuff. */
 341                 int ch_len;
 342
 343                 if (s->options & SSL_OP_NO_SSLv2)
 344                         {
 345                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 346                         goto err;
 347                         }
 348                 if (s->s2 == NULL)
 349                         {
 350                         if (!ssl2_new(s))
 351                                 goto err;
 352                         }
 353                 else
 354                         ssl2_clear(s);
 355
 356                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 357                         ch_len=SSL2_CHALLENGE_LENGTH;
 358                 else
 359                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 360
 361                 /* write out sslv2 challenge */
 362                 i=(SSL3_RANDOM_SIZE < ch_len)
 363                         ?SSL3_RANDOM_SIZE:ch_len;
 364                 s->s2->challenge_length=i;
 365                 memcpy(s->s2->challenge,
 366                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 367
 368                 if (s->s3 != NULL) ssl3_free(s);
 369
 370                 if (!BUF_MEM_grow(s->init_buf,
 371                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 372                         {
 373                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
 374                         goto err;
 375                         }
 376
 377                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
 378                 if (!(s->client_version == SSL2_VERSION))
 379                         /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
 380                         s->s2->ssl2_rollback=1;
 381
 382                 /* setup the 5 bytes we have read so we get them from
 383                  * the sslv2 buffer */
 384                 s->rstate=SSL_ST_READ_HEADER;
 385                 s->packet_length=n;
 386                 s->packet= &(s->s2->rbuf[0]);
 387                 memcpy(s->packet,buf,n);
 388                 s->s2->rbuf_left=n;
 389                 s->s2->rbuf_offs=0;
 390
 391                 /* we have already written one */
 392                 s->s2->write_sequence=1;
 393
 394                 s->method=SSLv2_client_method();
 395                 s->handshake_func=s->method->ssl_connect;
 396 #endif
 397                 }
 398         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 399                  (p[1] == SSL3_VERSION_MAJOR) &&
 400                  ((p[2] == SSL3_VERSION_MINOR) ||
 401                   (p[2] == TLS1_VERSION_MINOR)) &&
 402                  (p[5] == SSL3_MT_SERVER_HELLO))
 403                 {
 404                 /* we have sslv3 or tls1 */
 405
 406                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 407
 408                 /* we are in this state */
 409                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 410
 411                 /* put the 5 bytes we have read into the input buffer
 412                  * for SSLv3 */
 413                 s->rstate=SSL_ST_READ_HEADER;
 414                 s->packet_length=n;
 415                 s->packet= &(s->s3->rbuf.buf[0]);
 416                 memcpy(s->packet,buf,n);
 417                 s->s3->rbuf.left=n;
 418                 s->s3->rbuf.offset=0;
 419
 420                 if ((p[2] == SSL3_VERSION_MINOR) &&
 421                         !(s->options & SSL_OP_NO_SSLv3))
 422                         {
 423                         s->version=SSL3_VERSION;
 424                         s->method=SSLv3_client_method();
 425                         }
 426                 else if ((p[2] == TLS1_VERSION_MINOR) &&
 427                         !(s->options & SSL_OP_NO_TLSv1))
 428                         {
 429                         s->version=TLS1_VERSION;
 430                         s->method=TLSv1_client_method();
 431                         }
 432                 else
 433                         {
 434                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 435                         goto err;
 436                         }
 437
 438                 s->handshake_func=s->method->ssl_connect;
 439                 }
 440         else if ((p[0] == SSL3_RT_ALERT) &&
 441                  (p[1] == SSL3_VERSION_MAJOR) &&
 442                  ((p[2] == SSL3_VERSION_MINOR) ||
 443                   (p[2] == TLS1_VERSION_MINOR)) &&
 444                  (p[3] == 0) &&
 445                  (p[4] == 2))
 446                 {
 447                 void (*cb)(const SSL *ssl,int type,int val)=NULL;
 448                 int j;
 449
 450                 /* An alert */
 451                 if (s->info_callback != NULL)
 452                         cb=s->info_callback;
 453                 else if (s->ctx->info_callback != NULL)
 454                         cb=s->ctx->info_callback;
 455
 456                 i=p[5];
 457                 if (cb != NULL)
 458                         {
 459                         j=(i<<8)|p[6];
 460                         cb(s,SSL_CB_READ_ALERT,j);
 461                         }
 462
 463                 s->rwstate=SSL_NOTHING;
 464                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
 465                 goto err;
 466                 }
 467         else
 468                 {
 469                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 470                 goto err;
 471                 }
 472         s->init_num=0;
 473
 474         /* Since, if we are sending a ssl23 client hello, we are not
 475          * reusing a session-id */
 476         if (!ssl_get_new_session(s,0))
 477                 goto err;
 478
 479         s->first_packet=1;
 480         return(SSL_connect(s));
 481 err:
 482         return(-1);
 483         }
 484