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 #ifndef NO_RSA
  71         if (ver == SSL2_VERSION)
  72                 return(SSLv2_server_method());
  73 #endif
  74         if (ver == SSL3_VERSION)
  75                 return(SSLv3_server_method());
  76         else if (ver == TLS1_VERSION)
  77                 return(TLSv1_server_method());
  78         else
  79                 return(NULL);
  80         }
  81
  82 SSL_METHOD *SSLv23_server_method(void)
  83         {
  84         static int init=1;
  85         static SSL_METHOD SSLv23_server_data;
  86
  87         if (init)
  88                 {
  89                 memcpy((char *)&SSLv23_server_data,
  90                         (char *)sslv23_base_method(),sizeof(SSL_METHOD));
  91                 SSLv23_server_data.ssl_accept=ssl23_accept;
  92                 SSLv23_server_data.get_ssl_method=ssl23_get_server_method;
  93                 init=0;
  94                 }
  95         return(&SSLv23_server_data);
  96         }
  97
  98 int ssl23_accept(SSL *s)
  99         {
 100         BUF_MEM *buf;
 101         unsigned long Time=time(NULL);
 102         void (*cb)()=NULL;
 103         int ret= -1;
 104         int new_state,state;
 105
 106         RAND_seed(&Time,sizeof(Time));
 107         ERR_clear_error();
 108         clear_sys_error();
 109
 110         if (s->info_callback != NULL)
 111                 cb=s->info_callback;
 112         else if (s->ctx->info_callback != NULL)
 113                 cb=s->ctx->info_callback;
 114
 115         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 116         s->in_handshake++;
 117
 118         for (;;)
 119                 {
 120                 state=s->state;
 121
 122                 switch(s->state)
 123                         {
 124                 case SSL_ST_BEFORE:
 125                 case SSL_ST_ACCEPT:
 126                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 127                 case SSL_ST_OK|SSL_ST_ACCEPT:
 128
 129                         s->server=1;
 130                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 131
 132                         /* s->version=SSL3_VERSION; */
 133                         s->type=SSL_ST_ACCEPT;
 134
 135                         if (s->init_buf == NULL)
 136                                 {
 137                                 if ((buf=BUF_MEM_new()) == NULL)
 138                                         {
 139                                         ret= -1;
 140                                         goto end;
 141                                         }
 142                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 143                                         {
 144                                         ret= -1;
 145                                         goto end;
 146                                         }
 147                                 s->init_buf=buf;
 148                                 }
 149
 150                         ssl3_init_finished_mac(s);
 151
 152                         s->state=SSL23_ST_SR_CLNT_HELLO_A;
 153                         s->ctx->stats.sess_accept++;
 154                         s->init_num=0;
 155                         break;
 156
 157                 case SSL23_ST_SR_CLNT_HELLO_A:
 158                 case SSL23_ST_SR_CLNT_HELLO_B:
 159
 160                         s->shutdown=0;
 161                         ret=ssl23_get_client_hello(s);
 162                         if (ret >= 0) cb=NULL;
 163                         goto end;
 164                         /* break; */
 165
 166                 default:
 167                         SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
 168                         ret= -1;
 169                         goto end;
 170                         /* break; */
 171                         }
 172
 173                 if ((cb != NULL) && (s->state != state))
 174                         {
 175                         new_state=s->state;
 176                         s->state=state;
 177                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 178                         s->state=new_state;
 179                         }
 180                 }
 181 end:
 182         if (cb != NULL)
 183                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 184         s->in_handshake--;
 185         return(ret);
 186         }
 187
 188
 189 int ssl23_get_client_hello(SSL *s)
 190         {
 191         char buf_space[8];
 192         char *buf= &(buf_space[0]);
 193         unsigned char *p,*d,*dd;
 194         unsigned int i;
 195         unsigned int csl,sil,cl;
 196         int n=0,j,tls1=0;
 197         int type=0,use_sslv2_strong=0;
 198         int v[2];
 199
 200         /* read the initial header */
 201         v[0]=v[1]=0;
 202         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
 203                 {
 204                 if (!ssl3_setup_buffers(s)) goto err;
 205
 206                 n=ssl23_read_bytes(s,7);
 207                 if (n != 7) return(n); /* n == -1 || n == 0 */
 208
 209                 p=s->packet;
 210
 211                 memcpy(buf,p,n);
 212
 213                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
 214                         {
 215                         /* SSLv2 header */
 216                         if ((p[3] == 0x00) && (p[4] == 0x02))
 217                                 {
 218                                 v[0]=p[3]; v[1]=p[4];
 219                                 /* SSLv2 */
 220                                 if (!(s->options & SSL_OP_NO_SSLv2))
 221                                         type=1;
 222                                 }
 223                         else if (p[3] == SSL3_VERSION_MAJOR)
 224                                 {
 225                                 v[0]=p[3]; v[1]=p[4];
 226                                 /* SSLv3/TLSv1 */
 227                                 if (p[4] >= TLS1_VERSION_MINOR)
 228                                         {
 229                                         if (!(s->options & SSL_OP_NO_TLSv1))
 230                                                 {
 231                                                 tls1=1;
 232                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 233                                                 }
 234                                         else if (!(s->options & SSL_OP_NO_SSLv3))
 235                                                 {
 236                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 237                                                 }
 238                                         else if (!(s->options & SSL_OP_NO_SSLv2))
 239                                                 {
 240                                                 type=1;
 241                                                 }
 242                                         }
 243                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 244                                         s->state=SSL23_ST_SR_CLNT_HELLO_B;
 245                                 else if (!(s->options & SSL_OP_NO_SSLv2))
 246                                         type=1;
 247
 248                                 if (s->options & SSL_OP_NON_EXPORT_FIRST)
 249                                         {
 250                                         STACK_OF(SSL_CIPHER) *sk;
 251                                         SSL_CIPHER *c;
 252                                         int ne2,ne3;
 253
 254                                         j=((p[0]&0x7f)<<8)|p[1];
 255                                         if (j > (1024*4))
 256                                                 {
 257                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 258                                                 goto err;
 259                                                 }
 260
 261                                         n=ssl23_read_bytes(s,j+2);
 262                                         if (n <= 0) return(n);
 263                                         p=s->packet;
 264
 265                                         if ((buf=Malloc(n)) == NULL)
 266                                                 {
 267                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 268                                                 goto err;
 269                                                 }
 270                                         memcpy(buf,p,n);
 271
 272                                         p+=5;
 273                                         n2s(p,csl);
 274                                         p+=4;
 275
 276                                         sk=ssl_bytes_to_cipher_list(
 277                                                 s,p,csl,NULL);
 278                                         if (sk != NULL)
 279                                                 {
 280                                                 ne2=ne3=0;
 281                                                 for (j=0; j<sk_SSL_CIPHER_num(sk); j++)
 282                                                         {
 283                                                         c=sk_SSL_CIPHER_value(sk,j);
 284                                                         if (!SSL_C_IS_EXPORT(c))
 285                                                                 {
 286                                                                 if ((c->id>>24L) == 2L)
 287                                                                         ne2=1;
 288                                                                 else
 289                                                                         ne3=1;
 290                                                                 }
 291                                                         }
 292                                                 if (ne2 && !ne3)
 293                                                         {
 294                                                         type=1;
 295                                                         use_sslv2_strong=1;
 296                                                         goto next_bit;
 297                                                         }
 298                                                 }
 299                                         }
 300                                 }
 301                         }
 302                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 303                          (p[1] == SSL3_VERSION_MAJOR) &&
 304                          (p[5] == SSL3_MT_CLIENT_HELLO))
 305                         {
 306                         v[0]=p[1]; v[1]=p[2];
 307                         /* true SSLv3 or tls1 */
 308                         if (p[2] >= TLS1_VERSION_MINOR)
 309                                 {
 310                                 if (!(s->options & SSL_OP_NO_TLSv1))
 311                                         {
 312                                         type=3;
 313                                         tls1=1;
 314                                         }
 315                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 316                                         type=3;
 317                                 }
 318                         else if (!(s->options & SSL_OP_NO_SSLv3))
 319                                 type=3;
 320                         }
 321                 else if ((strncmp("GET ", (char *)p,4) == 0) ||
 322                          (strncmp("POST ",(char *)p,5) == 0) ||
 323                          (strncmp("HEAD ",(char *)p,5) == 0) ||
 324                          (strncmp("PUT ", (char *)p,4) == 0))
 325                         {
 326                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
 327                         goto err;
 328                         }
 329                 else if (strncmp("CONNECT",(char *)p,7) == 0)
 330                         {
 331                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
 332                         goto err;
 333                         }
 334                 }
 335
 336 next_bit:
 337         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
 338                 {
 339                 /* we have a SSLv3/TLSv1 in a SSLv2 header */
 340                 type=2;
 341                 p=s->packet;
 342                 n=((p[0]&0x7f)<<8)|p[1];
 343                 if (n > (1024*4))
 344                         {
 345                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 346                         goto err;
 347                         }
 348
 349                 j=ssl23_read_bytes(s,n+2);
 350                 if (j <= 0) return(j);
 351
 352                 ssl3_finish_mac(s,&(s->packet[2]),s->packet_length-2);
 353
 354                 p=s->packet;
 355                 p+=5;
 356                 n2s(p,csl);
 357                 n2s(p,sil);
 358                 n2s(p,cl);
 359                 d=(unsigned char *)s->init_buf->data;
 360                 if ((csl+sil+cl+11) != s->packet_length)
 361                         {
 362                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 363                         goto err;
 364                         }
 365
 366                 *(d++)=SSL3_VERSION_MAJOR;
 367                 if (tls1)
 368                         *(d++)=TLS1_VERSION_MINOR;
 369                 else
 370                         *(d++)=SSL3_VERSION_MINOR;
 371
 372                 /* lets populate the random area */
 373                 /* get the chalenge_length */
 374                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
 375                 memset(d,0,SSL3_RANDOM_SIZE);
 376                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
 377                 d+=SSL3_RANDOM_SIZE;
 378
 379                 /* no session-id reuse */
 380                 *(d++)=0;
 381
 382                 /* ciphers */
 383                 j=0;
 384                 dd=d;
 385                 d+=2;
 386                 for (i=0; i<csl; i+=3)
 387                         {
 388                         if (p[i] != 0) continue;
 389                         *(d++)=p[i+1];
 390                         *(d++)=p[i+2];
 391                         j+=2;
 392                         }
 393                 s2n(j,dd);
 394
 395                 /* COMPRESSION */
 396                 *(d++)=1;
 397                 *(d++)=0;
 398
 399                 i=(d-(unsigned char *)s->init_buf->data);
 400
 401                 /* get the data reused from the init_buf */
 402                 s->s3->tmp.reuse_message=1;
 403                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
 404                 s->s3->tmp.message_size=i;
 405                 }
 406
 407         if (type == 1)
 408                 {
 409 #ifdef NO_RSA
 410                 goto err;
 411 #else
 412                 /* we are talking sslv2 */
 413                 /* we need to clean up the SSLv3/TLSv1 setup and put in the
 414                  * sslv2 stuff. */
 415
 416                 if (s->s2 == NULL)
 417                         {
 418                         if (!ssl2_new(s))
 419                                 goto err;
 420                         }
 421                 else
 422                         ssl2_clear(s);
 423
 424                 if (s->s3 != NULL) ssl3_free(s);
 425
 426                 if (!BUF_MEM_grow(s->init_buf,
 427                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 428                         {
 429                         goto err;
 430                         }
 431
 432                 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 433                 if ((s->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
 434                         use_sslv2_strong)
 435                         s->s2->ssl2_rollback=0;
 436                 else
 437                         s->s2->ssl2_rollback=1;
 438
 439                 /* setup the 5 bytes we have read so we get them from
 440                  * the sslv2 buffer */
 441                 s->rstate=SSL_ST_READ_HEADER;
 442                 s->packet_length=n;
 443                 s->packet= &(s->s2->rbuf[0]);
 444                 memcpy(s->packet,buf,n);
 445                 s->s2->rbuf_left=n;
 446                 s->s2->rbuf_offs=0;
 447
 448                 s->method=SSLv2_server_method();
 449                 s->handshake_func=s->method->ssl_accept;
 450 #endif
 451                 }
 452
 453         if ((type == 2) || (type == 3))
 454                 {
 455                 /* we have SSLv3/TLSv1 */
 456
 457                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 458
 459                 /* we are in this state */
 460                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 461
 462                 if (type == 3)
 463                         {
 464                         /* put the 'n' bytes we have read into the input buffer
 465                          * for SSLv3 */
 466                         s->rstate=SSL_ST_READ_HEADER;
 467                         s->packet_length=n;
 468                         s->packet= &(s->s3->rbuf.buf[0]);
 469                         memcpy(s->packet,buf,n);
 470                         s->s3->rbuf.left=n;
 471                         s->s3->rbuf.offset=0;
 472                         }
 473                 else
 474                         {
 475                         s->packet_length=0;
 476                         s->s3->rbuf.left=0;
 477                         s->s3->rbuf.offset=0;
 478                         }
 479
 480                 if (tls1)
 481                         {
 482                         s->version=TLS1_VERSION;
 483                         s->method=TLSv1_server_method();
 484                         }
 485                 else
 486                         {
 487                         s->version=SSL3_VERSION;
 488                         s->method=SSLv3_server_method();
 489                         }
 490                 s->client_version=(v[0]<<8)|v[1];
 491                 s->handshake_func=s->method->ssl_accept;
 492                 }
 493
 494         if ((type < 1) || (type > 3))
 495                 {
 496                 /* bad, very bad */
 497                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 498                 goto err;
 499                 }
 500         s->init_num=0;
 501
 502         if (buf != buf_space) Free(buf);
 503         s->first_packet=1;
 504         return(SSL_accept(s));
 505 err:
 506         if (buf != buf_space) Free(buf);
 507         return(-1);
 508         }
 509