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                 if (init)
  93                         {
  94                         memcpy((char *)&SSLv23_client_data,
  95                                 (char *)sslv23_base_method(),sizeof(SSL_METHOD));
  96                         SSLv23_client_data.ssl_connect=ssl23_connect;
  97                         SSLv23_client_data.get_ssl_method=ssl23_get_client_method;
  98                         init=0;
  99                         }
 100
 101                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 102                 }
 103         return(&SSLv23_client_data);
 104         }
 105
 106 int ssl23_connect(SSL *s)
 107         {
 108         BUF_MEM *buf=NULL;
 109         unsigned long Time=time(NULL);
 110         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 111         int ret= -1;
 112         int new_state,state;
 113
 114         RAND_add(&Time,sizeof(Time),0);
 115         ERR_clear_error();
 116         clear_sys_error();
 117
 118         if (s->info_callback != NULL)
 119                 cb=s->info_callback;
 120         else if (s->ctx->info_callback != NULL)
 121                 cb=s->ctx->info_callback;
 122
 123         s->in_handshake++;
 124         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 125
 126         for (;;)
 127                 {
 128                 state=s->state;
 129
 130                 switch(s->state)
 131                         {
 132                 case SSL_ST_BEFORE:
 133                 case SSL_ST_CONNECT:
 134                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 135                 case SSL_ST_OK|SSL_ST_CONNECT:
 136
 137                         if (s->session != NULL)
 138                                 {
 139                                 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
 140                                 ret= -1;
 141                                 goto end;
 142                                 }
 143                         s->server=0;
 144                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 145
 146                         /* s->version=TLS1_VERSION; */
 147                         s->type=SSL_ST_CONNECT;
 148
 149                         if (s->init_buf == NULL)
 150                                 {
 151                                 if ((buf=BUF_MEM_new()) == NULL)
 152                                         {
 153                                         ret= -1;
 154                                         goto end;
 155                                         }
 156                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 157                                         {
 158                                         ret= -1;
 159                                         goto end;
 160                                         }
 161                                 s->init_buf=buf;
 162                                 buf=NULL;
 163                                 }
 164
 165                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 166
 167                         ssl3_init_finished_mac(s);
 168
 169                         s->state=SSL23_ST_CW_CLNT_HELLO_A;
 170                         s->ctx->stats.sess_connect++;
 171                         s->init_num=0;
 172                         break;
 173
 174                 case SSL23_ST_CW_CLNT_HELLO_A:
 175                 case SSL23_ST_CW_CLNT_HELLO_B:
 176
 177                         s->shutdown=0;
 178                         ret=ssl23_client_hello(s);
 179                         if (ret <= 0) goto end;
 180                         s->state=SSL23_ST_CR_SRVR_HELLO_A;
 181                         s->init_num=0;
 182
 183                         break;
 184
 185                 case SSL23_ST_CR_SRVR_HELLO_A:
 186                 case SSL23_ST_CR_SRVR_HELLO_B:
 187                         ret=ssl23_get_server_hello(s);
 188                         if (ret >= 0) cb=NULL;
 189                         goto end;
 190                         /* break; */
 191
 192                 default:
 193                         SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
 194                         ret= -1;
 195                         goto end;
 196                         /* break; */
 197                         }
 198
 199                 if (s->debug) { (void)BIO_flush(s->wbio); }
 200
 201                 if ((cb != NULL) && (s->state != state))
 202                         {
 203                         new_state=s->state;
 204                         s->state=state;
 205                         cb(s,SSL_CB_CONNECT_LOOP,1);
 206                         s->state=new_state;
 207                         }
 208                 }
 209 end:
 210         s->in_handshake--;
 211         if (buf != NULL)
 212                 BUF_MEM_free(buf);
 213         if (cb != NULL)
 214                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 215         return(ret);
 216         }
 217
 218
 219 static int ssl23_client_hello(SSL *s)
 220         {
 221         unsigned char *buf;
 222         unsigned char *p,*d;
 223         int i,ch_len;
 224         int ret;
 225
 226         buf=(unsigned char *)s->init_buf->data;
 227         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
 228                 {
 229 #if 0
 230                 /* don't reuse session-id's */
 231                 if (!ssl_get_new_session(s,0))
 232                         {
 233                         return(-1);
 234                         }
 235 #endif
 236
 237                 p=s->s3->client_random;
 238                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE) <= 0)
 239                         return -1;
 240
 241                 /* Do the message type and length last */
 242                 d= &(buf[2]);
 243                 p=d+9;
 244
 245                 *(d++)=SSL2_MT_CLIENT_HELLO;
 246                 if (!(s->options & SSL_OP_NO_TLSv1))
 247                         {
 248                         *(d++)=TLS1_VERSION_MAJOR;
 249                         *(d++)=TLS1_VERSION_MINOR;
 250                         s->client_version=TLS1_VERSION;
 251                         }
 252                 else if (!(s->options & SSL_OP_NO_SSLv3))
 253                         {
 254                         *(d++)=SSL3_VERSION_MAJOR;
 255                         *(d++)=SSL3_VERSION_MINOR;
 256                         s->client_version=SSL3_VERSION;
 257                         }
 258                 else if (!(s->options & SSL_OP_NO_SSLv2))
 259                         {
 260                         *(d++)=SSL2_VERSION_MAJOR;
 261                         *(d++)=SSL2_VERSION_MINOR;
 262                         s->client_version=SSL2_VERSION;
 263                         }
 264                 else
 265                         {
 266                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
 267                         return(-1);
 268                         }
 269
 270                 /* Ciphers supported */
 271                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p);
 272                 if (i == 0)
 273                         {
 274                         /* no ciphers */
 275                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 276                         return(-1);
 277                         }
 278                 s2n(i,d);
 279                 p+=i;
 280
 281                 /* put in the session-id, zero since there is no
 282                  * reuse. */
 283 #if 0
 284                 s->session->session_id_length=0;
 285 #endif
 286                 s2n(0,d);
 287
 288                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 289                         ch_len=SSL2_CHALLENGE_LENGTH;
 290                 else
 291                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 292
 293                 /* write out sslv2 challenge */
 294                 if (SSL3_RANDOM_SIZE < ch_len)
 295                         i=SSL3_RANDOM_SIZE;
 296                 else
 297                         i=ch_len;
 298                 s2n(i,d);
 299                 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
 300                 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
 301                         return -1;
 302
 303                 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 304                 p+=i;
 305
 306                 i= p- &(buf[2]);
 307                 buf[0]=((i>>8)&0xff)|0x80;
 308                 buf[1]=(i&0xff);
 309
 310                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
 311                 /* number of bytes to write */
 312                 s->init_num=i+2;
 313                 s->init_off=0;
 314
 315                 ssl3_finish_mac(s,&(buf[2]),i);
 316                 }
 317
 318         /* SSL3_ST_CW_CLNT_HELLO_B */
 319         ret = ssl23_write_bytes(s);
 320         if (ret >= 2)
 321                 if (s->msg_callback)
 322                         s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
 323         return ret;
 324         }
 325
 326 static int ssl23_get_server_hello(SSL *s)
 327         {
 328         char buf[8];
 329         unsigned char *p;
 330         int i;
 331         int n;
 332
 333         n=ssl23_read_bytes(s,7);
 334
 335         if (n != 7) return(n);
 336         p=s->packet;
 337
 338         memcpy(buf,p,n);
 339
 340         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
 341                 (p[5] == 0x00) && (p[6] == 0x02))
 342                 {
 343 #ifdef OPENSSL_NO_SSL2
 344                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 345                 goto err;
 346 #else
 347                 /* we are talking sslv2 */
 348                 /* we need to clean up the SSLv3 setup and put in the
 349                  * sslv2 stuff. */
 350                 int ch_len;
 351
 352                 if (s->options & SSL_OP_NO_SSLv2)
 353                         {
 354                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 355                         goto err;
 356                         }
 357                 if (s->s2 == NULL)
 358                         {
 359                         if (!ssl2_new(s))
 360                                 goto err;
 361                         }
 362                 else
 363                         ssl2_clear(s);
 364
 365                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
 366                         ch_len=SSL2_CHALLENGE_LENGTH;
 367                 else
 368                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 369
 370                 /* write out sslv2 challenge */
 371                 i=(SSL3_RANDOM_SIZE < ch_len)
 372                         ?SSL3_RANDOM_SIZE:ch_len;
 373                 s->s2->challenge_length=i;
 374                 memcpy(s->s2->challenge,
 375                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
 376
 377                 if (s->s3 != NULL) ssl3_free(s);
 378
 379                 if (!BUF_MEM_grow_clean(s->init_buf,
 380                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 381                         {
 382                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
 383                         goto err;
 384                         }
 385
 386                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
 387                 if (!(s->client_version == SSL2_VERSION))
 388                         /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
 389                         s->s2->ssl2_rollback=1;
 390
 391                 /* setup the 5 bytes we have read so we get them from
 392                  * the sslv2 buffer */
 393                 s->rstate=SSL_ST_READ_HEADER;
 394                 s->packet_length=n;
 395                 s->packet= &(s->s2->rbuf[0]);
 396                 memcpy(s->packet,buf,n);
 397                 s->s2->rbuf_left=n;
 398                 s->s2->rbuf_offs=0;
 399
 400                 /* we have already written one */
 401                 s->s2->write_sequence=1;
 402
 403                 s->method=SSLv2_client_method();
 404                 s->handshake_func=s->method->ssl_connect;
 405 #endif
 406                 }
 407         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 408                  (p[1] == SSL3_VERSION_MAJOR) &&
 409                  ((p[2] == SSL3_VERSION_MINOR) ||
 410                   (p[2] == TLS1_VERSION_MINOR)) &&
 411                  (p[5] == SSL3_MT_SERVER_HELLO))
 412                 {
 413                 /* we have sslv3 or tls1 */
 414
 415                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 416
 417                 /* we are in this state */
 418                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 419
 420                 /* put the 5 bytes we have read into the input buffer
 421                  * for SSLv3 */
 422                 s->rstate=SSL_ST_READ_HEADER;
 423                 s->packet_length=n;
 424                 s->packet= &(s->s3->rbuf.buf[0]);
 425                 memcpy(s->packet,buf,n);
 426                 s->s3->rbuf.left=n;
 427                 s->s3->rbuf.offset=0;
 428
 429                 if ((p[2] == SSL3_VERSION_MINOR) &&
 430                         !(s->options & SSL_OP_NO_SSLv3))
 431                         {
 432                         s->version=SSL3_VERSION;
 433                         s->method=SSLv3_client_method();
 434                         }
 435                 else if ((p[2] == TLS1_VERSION_MINOR) &&
 436                         !(s->options & SSL_OP_NO_TLSv1))
 437                         {
 438                         s->version=TLS1_VERSION;
 439                         s->method=TLSv1_client_method();
 440                         }
 441                 else
 442                         {
 443                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
 444                         goto err;
 445                         }
 446
 447                 s->handshake_func=s->method->ssl_connect;
 448                 }
 449         else if ((p[0] == SSL3_RT_ALERT) &&
 450                  (p[1] == SSL3_VERSION_MAJOR) &&
 451                  ((p[2] == SSL3_VERSION_MINOR) ||
 452                   (p[2] == TLS1_VERSION_MINOR)) &&
 453                  (p[3] == 0) &&
 454                  (p[4] == 2))
 455                 {
 456                 void (*cb)(const SSL *ssl,int type,int val)=NULL;
 457                 int j;
 458
 459                 /* An alert */
 460                 if (s->info_callback != NULL)
 461                         cb=s->info_callback;
 462                 else if (s->ctx->info_callback != NULL)
 463                         cb=s->ctx->info_callback;
 464
 465                 i=p[5];
 466                 if (cb != NULL)
 467                         {
 468                         j=(i<<8)|p[6];
 469                         cb(s,SSL_CB_READ_ALERT,j);
 470                         }
 471
 472                 s->rwstate=SSL_NOTHING;
 473                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
 474                 goto err;
 475                 }
 476         else
 477                 {
 478                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 479                 goto err;
 480                 }
 481         s->init_num=0;
 482
 483         /* Since, if we are sending a ssl23 client hello, we are not
 484          * reusing a session-id */
 485         if (!ssl_get_new_session(s,0))
 486                 goto err;
 487
 488         s->first_packet=1;
 489         return(SSL_connect(s));
 490 err:
 491         return(-1);
 492         }
 493