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 "buffer.h"
  61 #include "rand.h"
  62 #include "objects.h"
  63 #include "evp.h"
  64 #include "ssl_locl.h"
  65
  66 #define BREAK break
  67
  68 #ifndef NOPROTO
  69 int ssl23_get_client_hello(SSL *s);
  70 #else
  71 int ssl23_get_client_hello();
  72 #endif
  73
  74 static SSL_METHOD *ssl23_get_server_method(ver)
  75 int ver;
  76         {
  77         if (ver == SSL2_VERSION)
  78                 return(SSLv2_server_method());
  79         else if (ver == SSL3_VERSION)
  80                 return(SSLv3_server_method());
  81         else if (ver == TLS1_VERSION)
  82                 return(TLSv1_server_method());
  83         else
  84                 return(NULL);
  85         }
  86
  87 SSL_METHOD *SSLv23_server_method()
  88         {
  89         static int init=1;
  90         static SSL_METHOD SSLv23_server_data;
  91
  92         if (init)
  93                 {
  94                 init=0;
  95                 memcpy((char *)&SSLv23_server_data,
  96                         (char *)sslv23_base_method(),sizeof(SSL_METHOD));
  97                 SSLv23_server_data.ssl_accept=ssl23_accept;
  98                 SSLv23_server_data.get_ssl_method=ssl23_get_server_method;
  99                 }
 100         return(&SSLv23_server_data);
 101         }
 102
 103 int ssl23_accept(s)
 104 SSL *s;
 105         {
 106         BUF_MEM *buf;
 107         unsigned long Time=time(NULL);
 108         void (*cb)()=NULL;
 109         int ret= -1;
 110         int new_state,state;
 111
 112         RAND_seed((unsigned char *)&Time,sizeof(Time));
 113         ERR_clear_error();
 114         clear_sys_error();
 115
 116         if (s->info_callback != NULL)
 117                 cb=s->info_callback;
 118         else if (s->ctx->info_callback != NULL)
 119                 cb=s->ctx->info_callback;
 120
 121         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 122         s->in_handshake++;
 123
 124         for (;;)
 125                 {
 126                 state=s->state;
 127
 128                 switch(s->state)
 129                         {
 130                 case SSL_ST_BEFORE:
 131                 case SSL_ST_ACCEPT:
 132                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 133                 case SSL_ST_OK|SSL_ST_ACCEPT:
 134
 135                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 136
 137                         /* s->version=SSL3_VERSION; */
 138                         s->type=SSL_ST_ACCEPT;
 139
 140                         if (s->init_buf == NULL)
 141                                 {
 142                                 if ((buf=BUF_MEM_new()) == NULL)
 143                                         {
 144                                         ret= -1;
 145                                         goto end;
 146                                         }
 147                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 148                                         {
 149                                         ret= -1;
 150                                         goto end;
 151                                         }
 152                                 s->init_buf=buf;
 153                                 }
 154
 155                         ssl3_init_finished_mac(s);
 156
 157                         s->state=SSL23_ST_SR_CLNT_HELLO_A;
 158                         s->ctx->sess_accept++;
 159                         s->init_num=0;
 160                         break;
 161
 162                 case SSL23_ST_SR_CLNT_HELLO_A:
 163                 case SSL23_ST_SR_CLNT_HELLO_B:
 164
 165                         s->shutdown=0;
 166                         ret=ssl23_get_client_hello(s);
 167                         if (ret >= 0) cb=NULL;
 168                         goto end;
 169                         break;
 170
 171                 default:
 172                         SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
 173                         ret= -1;
 174                         goto end;
 175                         /* break; */
 176                         }
 177
 178                 if ((cb != NULL) && (s->state != state))
 179                         {
 180                         new_state=s->state;
 181                         s->state=state;
 182                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 183                         s->state=new_state;
 184                         }
 185                 }
 186 end:
 187         if (cb != NULL)
 188                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 189         s->in_handshake--;
 190         return(ret);
 191         }
 192
 193
 194 int ssl23_get_client_hello(s)
 195 SSL *s;
 196         {
 197         char buf_space[8];
 198         char *buf= &(buf_space[0]);
 199         unsigned char *p,*d,*dd;
 200         unsigned int i;
 201         unsigned int csl,sil,cl;
 202         int n=0,j,tls1=0;
 203         int type=0,use_sslv2_strong=0;
 204
 205         /* read the initial header */
 206         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
 207                 {
 208                 if (!ssl3_setup_buffers(s)) goto err;
 209
 210                 n=ssl23_read_bytes(s,7);
 211                 if (n != 7) return(n);
 212
 213                 p=s->packet;
 214
 215                 memcpy(buf,p,n);
 216
 217                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
 218                         {
 219                         /* SSLv2 header */
 220                         if ((p[3] == 0x00) && (p[4] == 0x02))
 221                                 {
 222                                 /* SSLv2 */
 223                                 if (!(s->options & SSL_OP_NO_SSLv2))
 224                                         type=1;
 225                                 }
 226                         else if (p[3] == SSL3_VERSION_MAJOR)
 227                                 {
 228                                 /* SSLv3/TLSv1 */
 229                                 if (p[4] >= TLS1_VERSION_MINOR)
 230                                         {
 231                                         if (!(s->options & SSL_OP_NO_TLSv1))
 232                                                 {
 233                                                 tls1=1;
 234                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 235                                                 }
 236                                         else if (!(s->options & SSL_OP_NO_SSLv3))
 237                                                 {
 238                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 239                                                 }
 240                                         }
 241                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 242                                         s->state=SSL23_ST_SR_CLNT_HELLO_B;
 243
 244                                 if (s->options & SSL_OP_NON_EXPORT_FIRST)
 245                                         {
 246                                         STACK *sk;
 247                                         SSL_CIPHER *c;
 248                                         int ne2,ne3;
 249
 250                                         j=((p[0]&0x7f)<<8)|p[1];
 251                                         if (j > (1024*4))
 252                                                 {
 253                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 254                                                 goto err;
 255                                                 }
 256
 257                                         n=ssl23_read_bytes(s,j+2);
 258                                         if (n <= 0) return(n);
 259                                         p=s->packet;
 260
 261                                         if ((buf=Malloc(n)) == NULL)
 262                                                 {
 263                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 264                                                 goto err;
 265                                                 }
 266                                         memcpy(buf,p,n);
 267
 268                                         p+=5;
 269                                         n2s(p,csl);
 270                                         p+=4;
 271
 272                                         sk=ssl_bytes_to_cipher_list(
 273                                                 s,p,csl,NULL);
 274                                         if (sk != NULL)
 275                                                 {
 276                                                 ne2=ne3=0;
 277                                                 for (j=0; j<sk_num(sk); j++)
 278                                                         {
 279                                                         c=(SSL_CIPHER *)sk_value(sk,j);
 280                                                         if (!(c->algorithms & SSL_EXP))
 281                                                                 {
 282                                                                 if ((c->id>>24L) == 2L)
 283                                                                         ne2=1;
 284                                                                 else
 285                                                                         ne3=1;
 286                                                                 }
 287                                                         }
 288                                                 if (ne2 && !ne3)
 289                                                         {
 290                                                         type=1;
 291                                                         use_sslv2_strong=1;
 292                                                         goto next_bit;
 293                                                         }
 294                                                 }
 295                                         }
 296                                 }
 297                         }
 298                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 299                          (p[1] == SSL3_VERSION_MAJOR) &&
 300                          (p[5] == SSL3_MT_CLIENT_HELLO))
 301                         {
 302                         /* true SSLv3 or tls1 */
 303                         if (p[2] >= TLS1_VERSION_MINOR)
 304                                 {
 305                                 if (!(s->options & SSL_OP_NO_TLSv1))
 306                                         {
 307                                         type=3;
 308                                         tls1=1;
 309                                         }
 310                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 311                                         type=3;
 312                                 }
 313                         else if (!(s->options & SSL_OP_NO_SSLv3))
 314                                 type=3;
 315                         }
 316                 else if ((strncmp("GET ", p,4) == 0) ||
 317                          (strncmp("POST ",p,5) == 0) ||
 318                          (strncmp("HEAD ",p,5) == 0) ||
 319                          (strncmp("PUT ", p,4) == 0))
 320                         {
 321                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
 322                         goto err;
 323                         }
 324                 else if (strncmp("CONNECT",p,7) == 0)
 325                         {
 326                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
 327                         goto err;
 328                         }
 329                 }
 330
 331 next_bit:
 332         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
 333                 {
 334                 /* we have a SSLv3/TLSv1 in a SSLv2 header */
 335                 type=2;
 336                 p=s->packet;
 337                 n=((p[0]&0x7f)<<8)|p[1];
 338                 if (n > (1024*4))
 339                         {
 340                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 341                         goto err;
 342                         }
 343
 344                 j=ssl23_read_bytes(s,n+2);
 345                 if (j <= 0) return(j);
 346
 347                 ssl3_finish_mac(s,&(s->packet[2]),s->packet_length-2);
 348
 349                 p=s->packet;
 350                 p+=5;
 351                 n2s(p,csl);
 352                 n2s(p,sil);
 353                 n2s(p,cl);
 354                 d=(unsigned char *)s->init_buf->data;
 355                 if ((csl+sil+cl+11) != s->packet_length)
 356                         {
 357                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 358                         goto err;
 359                         }
 360
 361                 *(d++)=SSL3_VERSION_MAJOR;
 362                 if (tls1)
 363                         *(d++)=TLS1_VERSION_MINOR;
 364                 else
 365                         *(d++)=SSL3_VERSION_MINOR;
 366
 367                 /* lets populate the random area */
 368                 /* get the chalenge_length */
 369                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
 370                 memset(d,0,SSL3_RANDOM_SIZE);
 371                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
 372                 d+=SSL3_RANDOM_SIZE;
 373
 374                 /* no session-id reuse */
 375                 *(d++)=0;
 376
 377                 /* ciphers */
 378                 j=0;
 379                 dd=d;
 380                 d+=2;
 381                 for (i=0; i<csl; i+=3)
 382                         {
 383                         if (p[i] != 0) continue;
 384                         *(d++)=p[i+1];
 385                         *(d++)=p[i+2];
 386                         j+=2;
 387                         }
 388                 s2n(j,dd);
 389
 390                 /* compression */
 391                 *(d++)=1;
 392                 *(d++)=0;
 393
 394                 i=(d-(unsigned char *)s->init_buf->data);
 395
 396                 /* get the data reused from the init_buf */
 397                 s->s3->tmp.reuse_message=1;
 398                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
 399                 s->s3->tmp.message_size=i;
 400                 }
 401
 402         if (type == 1)
 403                 {
 404                 /* we are talking sslv2 */
 405                 /* we need to clean up the SSLv3/TLSv1 setup and put in the
 406                  * sslv2 stuff. */
 407
 408                 if (s->s2 == NULL)
 409                         {
 410                         if (!ssl2_new(s))
 411                                 goto err;
 412                         }
 413                 else
 414                         ssl2_clear(s);
 415
 416                 if (s->s3 != NULL) ssl3_free(s);
 417
 418                 if (!BUF_MEM_grow(s->init_buf,
 419                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 420                         {
 421                         goto err;
 422                         }
 423
 424                 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 425                 if ((s->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
 426                         use_sslv2_strong)
 427                         s->s2->ssl2_rollback=0;
 428                 else
 429                         s->s2->ssl2_rollback=1;
 430
 431                 /* setup the 5 bytes we have read so we get them from
 432                  * the sslv2 buffer */
 433                 s->rstate=SSL_ST_READ_HEADER;
 434                 s->packet_length=n;
 435                 s->packet= &(s->s2->rbuf[0]);
 436                 memcpy(s->packet,buf,n);
 437                 s->s2->rbuf_left=n;
 438                 s->s2->rbuf_offs=0;
 439
 440                 s->method=SSLv2_server_method();
 441                 s->handshake_func=s->method->ssl_accept;
 442                 }
 443
 444         if ((type == 2) || (type == 3))
 445                 {
 446                 /* we have SSLv3/TLSv1 */
 447
 448                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 449
 450                 /* we are in this state */
 451                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 452
 453                 if (type == 3)
 454                         {
 455                         /* put the 'n' bytes we have read into the input buffer
 456                          * for SSLv3 */
 457                         s->rstate=SSL_ST_READ_HEADER;
 458                         s->packet_length=n;
 459                         s->packet= &(s->s3->rbuf.buf[0]);
 460                         memcpy(s->packet,buf,n);
 461                         s->s3->rbuf.left=n;
 462                         s->s3->rbuf.offset=0;
 463                         }
 464                 else
 465                         {
 466                         s->packet_length=0;
 467                         s->s3->rbuf.left=0;
 468                         s->s3->rbuf.offset=0;
 469                         }
 470
 471                 if (tls1)
 472                         {
 473                         s->version=TLS1_VERSION;
 474                         s->method=TLSv1_server_method();
 475                         }
 476                 else
 477                         {
 478                         s->version=SSL3_VERSION;
 479                         s->method=SSLv3_server_method();
 480                         }
 481                 s->handshake_func=s->method->ssl_accept;
 482                 }
 483
 484         if ((type < 1) || (type > 3))
 485                 {
 486                 /* bad, very bad */
 487                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 488                 goto err;
 489                 }
 490         s->init_num=0;
 491
 492         if (buf != buf_space) Free(buf);
 493         s->first_packet=1;
 494         return(SSL_accept(s));
 495 err:
 496         if (buf != buf_space) Free(buf);
 497         return(-1);
 498         }
 499