ssl/s23_srvr.c

   1 /* ssl/s23_srvr.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_server_method(int ver);
  67 int ssl23_get_client_hello(SSL *s);
  68 static SSL_METHOD *ssl23_get_server_method(int ver)
  69         {
  70         if (ver == SSL2_VERSION)
  71                 return(SSLv2_server_method());
  72         if (ver == SSL3_VERSION)
  73                 return(SSLv3_server_method());
  74         else if (ver == TLS1_VERSION)
  75                 return(TLSv1_server_method());
  76         else
  77                 return(NULL);
  78         }
  79
  80 SSL_METHOD *SSLv23_server_method(void)
  81         {
  82         static int init=1;
  83         static SSL_METHOD SSLv23_server_data;
  84
  85         if (init)
  86                 {
  87                 memcpy((char *)&SSLv23_server_data,
  88                         (char *)sslv23_base_method(),sizeof(SSL_METHOD));
  89                 SSLv23_server_data.ssl_accept=ssl23_accept;
  90                 SSLv23_server_data.get_ssl_method=ssl23_get_server_method;
  91                 init=0;
  92                 }
  93         return(&SSLv23_server_data);
  94         }
  95
  96 int ssl23_accept(SSL *s)
  97         {
  98         BUF_MEM *buf;
  99         unsigned long Time=time(NULL);
 100         void (*cb)()=NULL;
 101         int ret= -1;
 102         int new_state,state;
 103
 104         RAND_seed(&Time,sizeof(Time));
 105         ERR_clear_error();
 106         clear_sys_error();
 107
 108         if (s->info_callback != NULL)
 109                 cb=s->info_callback;
 110         else if (s->ctx->info_callback != NULL)
 111                 cb=s->ctx->info_callback;
 112
 113         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 114         s->in_handshake++;
 115
 116         for (;;)
 117                 {
 118                 state=s->state;
 119
 120                 switch(s->state)
 121                         {
 122                 case SSL_ST_BEFORE:
 123                 case SSL_ST_ACCEPT:
 124                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 125                 case SSL_ST_OK|SSL_ST_ACCEPT:
 126
 127                         s->server=1;
 128                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 129
 130                         /* s->version=SSL3_VERSION; */
 131                         s->type=SSL_ST_ACCEPT;
 132
 133                         if (s->init_buf == NULL)
 134                                 {
 135                                 if ((buf=BUF_MEM_new()) == NULL)
 136                                         {
 137                                         ret= -1;
 138                                         goto end;
 139                                         }
 140                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 141                                         {
 142                                         ret= -1;
 143                                         goto end;
 144                                         }
 145                                 s->init_buf=buf;
 146                                 }
 147
 148                         ssl3_init_finished_mac(s);
 149
 150                         s->state=SSL23_ST_SR_CLNT_HELLO_A;
 151                         s->ctx->stats.sess_accept++;
 152                         s->init_num=0;
 153                         break;
 154
 155                 case SSL23_ST_SR_CLNT_HELLO_A:
 156                 case SSL23_ST_SR_CLNT_HELLO_B:
 157
 158                         s->shutdown=0;
 159                         ret=ssl23_get_client_hello(s);
 160                         if (ret >= 0) cb=NULL;
 161                         goto end;
 162                         /* break; */
 163
 164                 default:
 165                         SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
 166                         ret= -1;
 167                         goto end;
 168                         /* break; */
 169                         }
 170
 171                 if ((cb != NULL) && (s->state != state))
 172                         {
 173                         new_state=s->state;
 174                         s->state=state;
 175                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 176                         s->state=new_state;
 177                         }
 178                 }
 179 end:
 180         if (cb != NULL)
 181                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 182         s->in_handshake--;
 183         return(ret);
 184         }
 185
 186
 187 int ssl23_get_client_hello(SSL *s)
 188         {
 189         char buf_space[8];
 190         char *buf= &(buf_space[0]);
 191         unsigned char *p,*d,*dd;
 192         unsigned int i;
 193         unsigned int csl,sil,cl;
 194         int n=0,j,tls1=0;
 195         int type=0,use_sslv2_strong=0;
 196         int v[2];
 197
 198         /* read the initial header */
 199         v[0]=v[1]=0;
 200         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
 201                 {
 202                 if (!ssl3_setup_buffers(s)) goto err;
 203
 204                 n=ssl23_read_bytes(s,7);
 205                 if (n != 7) return(n); /* n == -1 || n == 0 */
 206
 207                 p=s->packet;
 208
 209                 memcpy(buf,p,n);
 210
 211                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
 212                         {
 213                         /* SSLv2 header */
 214                         if ((p[3] == 0x00) && (p[4] == 0x02))
 215                                 {
 216                                 v[0]=p[3]; v[1]=p[4];
 217                                 /* SSLv2 */
 218                                 if (!(s->options & SSL_OP_NO_SSLv2))
 219                                         type=1;
 220                                 }
 221                         else if (p[3] == SSL3_VERSION_MAJOR)
 222                                 {
 223                                 v[0]=p[3]; v[1]=p[4];
 224                                 /* SSLv3/TLSv1 */
 225                                 if (p[4] >= TLS1_VERSION_MINOR)
 226                                         {
 227                                         if (!(s->options & SSL_OP_NO_TLSv1))
 228                                                 {
 229                                                 tls1=1;
 230                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 231                                                 }
 232                                         else if (!(s->options & SSL_OP_NO_SSLv3))
 233                                                 {
 234                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 235                                                 }
 236                                         else if (!(s->options & SSL_OP_NO_SSLv2))
 237                                                 {
 238                                                 type=1;
 239                                                 }
 240                                         }
 241                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 242                                         s->state=SSL23_ST_SR_CLNT_HELLO_B;
 243                                 else if (!(s->options & SSL_OP_NO_SSLv2))
 244                                         type=1;
 245
 246                                 if (s->options & SSL_OP_NON_EXPORT_FIRST)
 247                                         {
 248                                         STACK_OF(SSL_CIPHER) *sk;
 249                                         SSL_CIPHER *c;
 250                                         int ne2,ne3;
 251
 252                                         j=((p[0]&0x7f)<<8)|p[1];
 253                                         if (j > (1024*4))
 254                                                 {
 255                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 256                                                 goto err;
 257                                                 }
 258
 259                                         n=ssl23_read_bytes(s,j+2);
 260                                         if (n <= 0) return(n);
 261                                         p=s->packet;
 262
 263                                         if ((buf=Malloc(n)) == NULL)
 264                                                 {
 265                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 266                                                 goto err;
 267                                                 }
 268                                         memcpy(buf,p,n);
 269
 270                                         p+=5;
 271                                         n2s(p,csl);
 272                                         p+=4;
 273
 274                                         sk=ssl_bytes_to_cipher_list(
 275                                                 s,p,csl,NULL);
 276                                         if (sk != NULL)
 277                                                 {
 278                                                 ne2=ne3=0;
 279                                                 for (j=0; j<sk_SSL_CIPHER_num(sk); j++)
 280                                                         {
 281                                                         c=sk_SSL_CIPHER_value(sk,j);
 282                                                         if (!SSL_C_IS_EXPORT(c))
 283                                                                 {
 284                                                                 if ((c->id>>24L) == 2L)
 285                                                                         ne2=1;
 286                                                                 else
 287                                                                         ne3=1;
 288                                                                 }
 289                                                         }
 290                                                 if (ne2 && !ne3)
 291                                                         {
 292                                                         type=1;
 293                                                         use_sslv2_strong=1;
 294                                                         goto next_bit;
 295                                                         }
 296                                                 }
 297                                         }
 298                                 }
 299                         }
 300                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 301                          (p[1] == SSL3_VERSION_MAJOR) &&
 302                          (p[5] == SSL3_MT_CLIENT_HELLO))
 303                         {
 304                         v[0]=p[1]; v[1]=p[2];
 305                         /* true SSLv3 or tls1 */
 306                         if (p[2] >= TLS1_VERSION_MINOR)
 307                                 {
 308                                 if (!(s->options & SSL_OP_NO_TLSv1))
 309                                         {
 310                                         type=3;
 311                                         tls1=1;
 312                                         }
 313                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 314                                         type=3;
 315                                 }
 316                         else if (!(s->options & SSL_OP_NO_SSLv3))
 317                                 type=3;
 318                         }
 319                 else if ((strncmp("GET ", (char *)p,4) == 0) ||
 320                          (strncmp("POST ",(char *)p,5) == 0) ||
 321                          (strncmp("HEAD ",(char *)p,5) == 0) ||
 322                          (strncmp("PUT ", (char *)p,4) == 0))
 323                         {
 324                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
 325                         goto err;
 326                         }
 327                 else if (strncmp("CONNECT",(char *)p,7) == 0)
 328                         {
 329                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
 330                         goto err;
 331                         }
 332                 }
 333
 334 next_bit:
 335         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
 336                 {
 337                 /* we have a SSLv3/TLSv1 in a SSLv2 header */
 338                 type=2;
 339                 p=s->packet;
 340                 n=((p[0]&0x7f)<<8)|p[1];
 341                 if (n > (1024*4))
 342                         {
 343                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 344                         goto err;
 345                         }
 346
 347                 j=ssl23_read_bytes(s,n+2);
 348                 if (j <= 0) return(j);
 349
 350                 ssl3_finish_mac(s,&(s->packet[2]),s->packet_length-2);
 351
 352                 p=s->packet;
 353                 p+=5;
 354                 n2s(p,csl);
 355                 n2s(p,sil);
 356                 n2s(p,cl);
 357                 d=(unsigned char *)s->init_buf->data;
 358                 if ((csl+sil+cl+11) != s->packet_length)
 359                         {
 360                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 361                         goto err;
 362                         }
 363
 364                 *(d++)=SSL3_VERSION_MAJOR;
 365                 if (tls1)
 366                         *(d++)=TLS1_VERSION_MINOR;
 367                 else
 368                         *(d++)=SSL3_VERSION_MINOR;
 369
 370                 /* lets populate the random area */
 371                 /* get the chalenge_length */
 372                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
 373                 memset(d,0,SSL3_RANDOM_SIZE);
 374                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
 375                 d+=SSL3_RANDOM_SIZE;
 376
 377                 /* no session-id reuse */
 378                 *(d++)=0;
 379
 380                 /* ciphers */
 381                 j=0;
 382                 dd=d;
 383                 d+=2;
 384                 for (i=0; i<csl; i+=3)
 385                         {
 386                         if (p[i] != 0) continue;
 387                         *(d++)=p[i+1];
 388                         *(d++)=p[i+2];
 389                         j+=2;
 390                         }
 391                 s2n(j,dd);
 392
 393                 /* COMPRESSION */
 394                 *(d++)=1;
 395                 *(d++)=0;
 396
 397                 i=(d-(unsigned char *)s->init_buf->data);
 398
 399                 /* get the data reused from the init_buf */
 400                 s->s3->tmp.reuse_message=1;
 401                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
 402                 s->s3->tmp.message_size=i;
 403                 }
 404
 405         if (type == 1)
 406                 {
 407                 /* we are talking sslv2 */
 408                 /* we need to clean up the SSLv3/TLSv1 setup and put in the
 409                  * sslv2 stuff. */
 410
 411                 if (s->s2 == NULL)
 412                         {
 413                         if (!ssl2_new(s))
 414                                 goto err;
 415                         }
 416                 else
 417                         ssl2_clear(s);
 418
 419                 if (s->s3 != NULL) ssl3_free(s);
 420
 421                 if (!BUF_MEM_grow(s->init_buf,
 422                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 423                         {
 424                         goto err;
 425                         }
 426
 427                 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 428                 if ((s->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
 429                         use_sslv2_strong)
 430                         s->s2->ssl2_rollback=0;
 431                 else
 432                         s->s2->ssl2_rollback=1;
 433
 434                 /* setup the 5 bytes we have read so we get them from
 435                  * the sslv2 buffer */
 436                 s->rstate=SSL_ST_READ_HEADER;
 437                 s->packet_length=n;
 438                 s->packet= &(s->s2->rbuf[0]);
 439                 memcpy(s->packet,buf,n);
 440                 s->s2->rbuf_left=n;
 441                 s->s2->rbuf_offs=0;
 442
 443                 s->method=SSLv2_server_method();
 444                 s->handshake_func=s->method->ssl_accept;
 445                 }
 446
 447         if ((type == 2) || (type == 3))
 448                 {
 449                 /* we have SSLv3/TLSv1 */
 450
 451                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 452
 453                 /* we are in this state */
 454                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 455
 456                 if (type == 3)
 457                         {
 458                         /* put the 'n' bytes we have read into the input buffer
 459                          * for SSLv3 */
 460                         s->rstate=SSL_ST_READ_HEADER;
 461                         s->packet_length=n;
 462                         s->packet= &(s->s3->rbuf.buf[0]);
 463                         memcpy(s->packet,buf,n);
 464                         s->s3->rbuf.left=n;
 465                         s->s3->rbuf.offset=0;
 466                         }
 467                 else
 468                         {
 469                         s->packet_length=0;
 470                         s->s3->rbuf.left=0;
 471                         s->s3->rbuf.offset=0;
 472                         }
 473
 474                 if (tls1)
 475                         {
 476                         s->version=TLS1_VERSION;
 477                         s->method=TLSv1_server_method();
 478                         }
 479                 else
 480                         {
 481                         s->version=SSL3_VERSION;
 482                         s->method=SSLv3_server_method();
 483                         }
 484                 s->client_version=(v[0]<<8)|v[1];
 485                 s->handshake_func=s->method->ssl_accept;
 486                 }
 487
 488         if ((type < 1) || (type > 3))
 489                 {
 490                 /* bad, very bad */
 491                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 492                 goto err;
 493                 }
 494         s->init_num=0;
 495
 496         if (buf != buf_space) Free(buf);
 497         s->first_packet=1;
 498         return(SSL_accept(s));
 499 err:
 500         if (buf != buf_space) Free(buf);
 501         return(-1);
 502         }
 503