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