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[11]; /* request this many bytes in initial read */
 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;
 195         int type=0,use_sslv2_strong=0;
 196         int v[2];
 197
 198         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
 199                 {
 200                 /* read the initial header */
 201                 v[0]=v[1]=0;
 202
 203                 if (!ssl3_setup_buffers(s)) goto err;
 204
 205                 n=ssl23_read_bytes(s, sizeof buf_space);
 206                 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
 207
 208                 p=s->packet;
 209
 210                 memcpy(buf,p,n);
 211
 212                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
 213                         {
 214                         /*
 215                          * SSLv2 header
 216                          */
 217                         if ((p[3] == 0x00) && (p[4] == 0x02))
 218                                 {
 219                                 v[0]=p[3]; v[1]=p[4];
 220                                 /* SSLv2 */
 221                                 if (!(s->options & SSL_OP_NO_SSLv2))
 222                                         type=1;
 223                                 }
 224                         else if (p[3] == SSL3_VERSION_MAJOR)
 225                                 {
 226                                 v[0]=p[3]; v[1]=p[4];
 227                                 /* SSLv3/TLSv1 */
 228                                 if (p[4] >= TLS1_VERSION_MINOR)
 229                                         {
 230                                         if (!(s->options & SSL_OP_NO_TLSv1))
 231                                                 {
 232                                                 s->version=TLS1_VERSION;
 233                                                 /* type=2; */ /* done later to survive restarts */
 234                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 235                                                 }
 236                                         else if (!(s->options & SSL_OP_NO_SSLv3))
 237                                                 {
 238                                                 s->version=SSL3_VERSION;
 239                                                 /* type=2; */
 240                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 241                                                 }
 242                                         else if (!(s->options & SSL_OP_NO_SSLv2))
 243                                                 {
 244                                                 type=1;
 245                                                 }
 246                                         }
 247                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 248                                         {
 249                                         s->version=SSL3_VERSION;
 250                                         /* type=2; */
 251                                         s->state=SSL23_ST_SR_CLNT_HELLO_B;
 252                                         }
 253                                 else if (!(s->options & SSL_OP_NO_SSLv2))
 254                                         type=1;
 255
 256                                 if (s->options & SSL_OP_NON_EXPORT_FIRST)
 257                                         /* Not only utterly confusing, but broken
 258                                          * ('fractured programming'?) -- the details
 259                                          * of this block nearly make it work
 260                                          * as intended in this environment, but on one
 261                                          * of the fine points (w.r.t. restarts) it fails.
 262                                          * The obvious fix would be even more devastating
 263                                          * to program structure; if you want the functionality,
 264                                          * throw this away and implement it in a way
 265                                          * that makes sense */
 266                                         {
 267                                         STACK_OF(SSL_CIPHER) *sk;
 268                                         SSL_CIPHER *c;
 269                                         int ne2,ne3;
 270
 271                                         j=((p[0]&0x7f)<<8)|p[1];
 272                                         if (j > (1024*4))
 273                                                 {
 274                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 275                                                 goto err;
 276                                                 }
 277
 278                                         n=ssl23_read_bytes(s,j+2);
 279                                         if (n <= 0) return(n);
 280                                         p=s->packet;
 281
 282                                         if ((buf=Malloc(n)) == NULL)
 283                                                 {
 284                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 285                                                 goto err;
 286                                                 }
 287                                         memcpy(buf,p,n);
 288
 289                                         p+=5;
 290                                         n2s(p,csl);
 291                                         p+=4;
 292
 293                                         sk=ssl_bytes_to_cipher_list(
 294                                                 s,p,csl,NULL);
 295                                         if (sk != NULL)
 296                                                 {
 297                                                 ne2=ne3=0;
 298                                                 for (j=0; j<sk_SSL_CIPHER_num(sk); j++)
 299                                                         {
 300                                                         c=sk_SSL_CIPHER_value(sk,j);
 301                                                         if (!SSL_C_IS_EXPORT(c))
 302                                                                 {
 303                                                                 if ((c->id>>24L) == 2L)
 304                                                                         ne2=1;
 305                                                                 else
 306                                                                         ne3=1;
 307                                                                 }
 308                                                         }
 309                                                 if (ne2 && !ne3)
 310                                                         {
 311                                                         type=1;
 312                                                         use_sslv2_strong=1;
 313                                                         goto next_bit;
 314                                                         }
 315                                                 }
 316                                         }
 317                                 }
 318                         }
 319                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 320                          (p[1] == SSL3_VERSION_MAJOR) &&
 321                          (p[5] == SSL3_MT_CLIENT_HELLO) &&
 322                          (p[9] == p[1]))
 323                         {
 324                         /*
 325                          * SSLv3 or tls1 header
 326                          */
 327
 328                         /* we must look at client_version inside the client hello: */
 329                         v[0]=p[9]; v[1]=p[10];
 330                         if (v[1] >= TLS1_VERSION_MINOR)
 331                                 {
 332                                 if (!(s->options & SSL_OP_NO_TLSv1))
 333                                         {
 334                                         s->version=TLS1_VERSION;
 335                                         type=3;
 336                                         }
 337                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 338                                         {
 339                                         s->version=SSL3_VERSION;
 340                                         type=3;
 341                                         }
 342                                 }
 343                         else if (!(s->options & SSL_OP_NO_SSLv3))
 344                                 type=3;
 345                         }
 346                 else if ((strncmp("GET ", (char *)p,4) == 0) ||
 347                          (strncmp("POST ",(char *)p,5) == 0) ||
 348                          (strncmp("HEAD ",(char *)p,5) == 0) ||
 349                          (strncmp("PUT ", (char *)p,4) == 0))
 350                         {
 351                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
 352                         goto err;
 353                         }
 354                 else if (strncmp("CONNECT",(char *)p,7) == 0)
 355                         {
 356                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
 357                         goto err;
 358                         }
 359                 }
 360
 361 next_bit:
 362         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
 363                 {
 364                 /* we have SSLv3/TLSv1 in an SSLv2 header
 365                  * (other cases skip this state) */
 366
 367                 type=2;
 368                 p=s->packet;
 369                 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
 370                 v[1] = p[4];
 371
 372                 n=((p[0]&0x7f)<<8)|p[1];
 373                 if (n > (1024*4))
 374                         {
 375                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 376                         goto err;
 377                         }
 378
 379                 j=ssl23_read_bytes(s,n+2);
 380                 if (j <= 0) return(j);
 381
 382                 ssl3_finish_mac(s,&(s->packet[2]),s->packet_length-2);
 383
 384                 p=s->packet;
 385                 p+=5;
 386                 n2s(p,csl);
 387                 n2s(p,sil);
 388                 n2s(p,cl);
 389                 d=(unsigned char *)s->init_buf->data;
 390                 if ((csl+sil+cl+11) != s->packet_length)
 391                         {
 392                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 393                         goto err;
 394                         }
 395
 396                 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
 397                 *(d++) = v[1];
 398
 399                 /* lets populate the random area */
 400                 /* get the chalenge_length */
 401                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
 402                 memset(d,0,SSL3_RANDOM_SIZE);
 403                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
 404                 d+=SSL3_RANDOM_SIZE;
 405
 406                 /* no session-id reuse */
 407                 *(d++)=0;
 408
 409                 /* ciphers */
 410                 j=0;
 411                 dd=d;
 412                 d+=2;
 413                 for (i=0; i<csl; i+=3)
 414                         {
 415                         if (p[i] != 0) continue;
 416                         *(d++)=p[i+1];
 417                         *(d++)=p[i+2];
 418                         j+=2;
 419                         }
 420                 s2n(j,dd);
 421
 422                 /* COMPRESSION */
 423                 *(d++)=1;
 424                 *(d++)=0;
 425
 426                 i=(d-(unsigned char *)s->init_buf->data);
 427
 428                 /* get the data reused from the init_buf */
 429                 s->s3->tmp.reuse_message=1;
 430                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
 431                 s->s3->tmp.message_size=i;
 432                 }
 433
 434         /* imaginary new state (for program structure): */
 435         /* s->state = SSL23_SR_CLNT_HELLO_C */
 436
 437         if (type == 1)
 438                 {
 439                 /* we are talking sslv2 */
 440                 /* we need to clean up the SSLv3/TLSv1 setup and put in the
 441                  * sslv2 stuff. */
 442
 443                 if (s->s2 == NULL)
 444                         {
 445                         if (!ssl2_new(s))
 446                                 goto err;
 447                         }
 448                 else
 449                         ssl2_clear(s);
 450
 451                 if (s->s3 != NULL) ssl3_free(s);
 452
 453                 if (!BUF_MEM_grow(s->init_buf,
 454                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 455                         {
 456                         goto err;
 457                         }
 458
 459                 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 460                 if ((s->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
 461                         use_sslv2_strong)
 462                         s->s2->ssl2_rollback=0;
 463                 else
 464                         s->s2->ssl2_rollback=1;
 465
 466                 /* setup the n bytes we have read so we get them from
 467                  * the sslv2 buffer */
 468                 s->rstate=SSL_ST_READ_HEADER;
 469                 s->packet_length=n;
 470                 s->packet= &(s->s2->rbuf[0]);
 471                 memcpy(s->packet,buf,n);
 472                 s->s2->rbuf_left=n;
 473                 s->s2->rbuf_offs=0;
 474
 475                 s->method=SSLv2_server_method();
 476                 s->handshake_func=s->method->ssl_accept;
 477                 }
 478
 479         if ((type == 2) || (type == 3))
 480                 {
 481                 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
 482
 483                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 484
 485                 /* we are in this state */
 486                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 487
 488                 if (type == 3)
 489                         {
 490                         /* put the 'n' bytes we have read into the input buffer
 491                          * for SSLv3 */
 492                         s->rstate=SSL_ST_READ_HEADER;
 493                         s->packet_length=n;
 494                         s->packet= &(s->s3->rbuf.buf[0]);
 495                         memcpy(s->packet,buf,n);
 496                         s->s3->rbuf.left=n;
 497                         s->s3->rbuf.offset=0;
 498                         }
 499                 else
 500                         {
 501                         s->packet_length=0;
 502                         s->s3->rbuf.left=0;
 503                         s->s3->rbuf.offset=0;
 504                         }
 505
 506                 if (s->version == TLS1_VERSION)
 507                         s->method = TLSv1_server_method();
 508                 else
 509                         s->method = SSLv3_server_method();
 510 #if 0 /* ssl3_get_client_hello does this */
 511                 s->client_version=(v[0]<<8)|v[1];
 512 #endif
 513                 s->handshake_func=s->method->ssl_accept;
 514                 }
 515
 516         if ((type < 1) || (type > 3))
 517                 {
 518                 /* bad, very bad */
 519                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 520                 goto err;
 521                 }
 522         s->init_num=0;
 523
 524         if (buf != buf_space) Free(buf);
 525         s->first_packet=1;
 526         return(SSL_accept(s));
 527 err:
 528         if (buf != buf_space) Free(buf);
 529         return(-1);
 530         }