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(&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                         s->server=1;
 138                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 139
 140                         /* s->version=SSL3_VERSION; */
 141                         s->type=SSL_ST_ACCEPT;
 142
 143                         if (s->init_buf == NULL)
 144                                 {
 145                                 if ((buf=BUF_MEM_new()) == NULL)
 146                                         {
 147                                         ret= -1;
 148                                         goto end;
 149                                         }
 150                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 151                                         {
 152                                         ret= -1;
 153                                         goto end;
 154                                         }
 155                                 s->init_buf=buf;
 156                                 }
 157
 158                         ssl3_init_finished_mac(s);
 159
 160                         s->state=SSL23_ST_SR_CLNT_HELLO_A;
 161                         s->ctx->stats.sess_accept++;
 162                         s->init_num=0;
 163                         break;
 164
 165                 case SSL23_ST_SR_CLNT_HELLO_A:
 166                 case SSL23_ST_SR_CLNT_HELLO_B:
 167
 168                         s->shutdown=0;
 169                         ret=ssl23_get_client_hello(s);
 170                         if (ret >= 0) cb=NULL;
 171                         goto end;
 172                         /* break; */
 173
 174                 default:
 175                         SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
 176                         ret= -1;
 177                         goto end;
 178                         /* break; */
 179                         }
 180
 181                 if ((cb != NULL) && (s->state != state))
 182                         {
 183                         new_state=s->state;
 184                         s->state=state;
 185                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 186                         s->state=new_state;
 187                         }
 188                 }
 189 end:
 190         if (cb != NULL)
 191                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 192         s->in_handshake--;
 193         return(ret);
 194         }
 195
 196
 197 int ssl23_get_client_hello(s)
 198 SSL *s;
 199         {
 200         char buf_space[8];
 201         char *buf= &(buf_space[0]);
 202         unsigned char *p,*d,*dd;
 203         unsigned int i;
 204         unsigned int csl,sil,cl;
 205         int n=0,j,tls1=0;
 206         int type=0,use_sslv2_strong=0;
 207         int v[2];
 208
 209         /* read the initial header */
 210         v[0]=v[1]=0;
 211         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
 212                 {
 213                 if (!ssl3_setup_buffers(s)) goto err;
 214
 215                 n=ssl23_read_bytes(s,7);
 216                 if (n != 7) return(n);
 217
 218                 p=s->packet;
 219
 220                 memcpy(buf,p,n);
 221
 222                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
 223                         {
 224                         /* SSLv2 header */
 225                         if ((p[3] == 0x00) && (p[4] == 0x02))
 226                                 {
 227                                 v[0]=p[3]; v[1]=p[4];
 228                                 /* SSLv2 */
 229                                 if (!(s->options & SSL_OP_NO_SSLv2))
 230                                         type=1;
 231                                 }
 232                         else if (p[3] == SSL3_VERSION_MAJOR)
 233                                 {
 234                                 v[0]=p[3]; v[1]=p[4];
 235                                 /* SSLv3/TLSv1 */
 236                                 if (p[4] >= TLS1_VERSION_MINOR)
 237                                         {
 238                                         if (!(s->options & SSL_OP_NO_TLSv1))
 239                                                 {
 240                                                 tls1=1;
 241                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 242                                                 }
 243                                         else if (!(s->options & SSL_OP_NO_SSLv3))
 244                                                 {
 245                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 246                                                 }
 247                                         else if (!(s->options & SSL_OP_NO_SSLv2))
 248                                                 {
 249                                                 type=1;
 250                                                 }
 251                                         }
 252                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 253                                         s->state=SSL23_ST_SR_CLNT_HELLO_B;
 254                                 else if (!(s->options & SSL_OP_NO_SSLv2))
 255                                         type=1;
 256
 257                                 if (s->options & SSL_OP_NON_EXPORT_FIRST)
 258                                         {
 259                                         STACK *sk;
 260                                         SSL_CIPHER *c;
 261                                         int ne2,ne3;
 262
 263                                         j=((p[0]&0x7f)<<8)|p[1];
 264                                         if (j > (1024*4))
 265                                                 {
 266                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 267                                                 goto err;
 268                                                 }
 269
 270                                         n=ssl23_read_bytes(s,j+2);
 271                                         if (n <= 0) return(n);
 272                                         p=s->packet;
 273
 274                                         if ((buf=Malloc(n)) == NULL)
 275                                                 {
 276                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 277                                                 goto err;
 278                                                 }
 279                                         memcpy(buf,p,n);
 280
 281                                         p+=5;
 282                                         n2s(p,csl);
 283                                         p+=4;
 284
 285                                         sk=ssl_bytes_to_cipher_list(
 286                                                 s,p,csl,NULL);
 287                                         if (sk != NULL)
 288                                                 {
 289                                                 ne2=ne3=0;
 290                                                 for (j=0; j<sk_num(sk); j++)
 291                                                         {
 292                                                         c=(SSL_CIPHER *)sk_value(sk,j);
 293                                                         if (!SSL_C_IS_EXPORT(c))
 294                                                                 {
 295                                                                 if ((c->id>>24L) == 2L)
 296                                                                         ne2=1;
 297                                                                 else
 298                                                                         ne3=1;
 299                                                                 }
 300                                                         }
 301                                                 if (ne2 && !ne3)
 302                                                         {
 303                                                         type=1;
 304                                                         use_sslv2_strong=1;
 305                                                         goto next_bit;
 306                                                         }
 307                                                 }
 308                                         }
 309                                 }
 310                         }
 311                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 312                          (p[1] == SSL3_VERSION_MAJOR) &&
 313                          (p[5] == SSL3_MT_CLIENT_HELLO))
 314                         {
 315                         v[0]=p[1]; v[1]=p[2];
 316                         /* true SSLv3 or tls1 */
 317                         if (p[2] >= TLS1_VERSION_MINOR)
 318                                 {
 319                                 if (!(s->options & SSL_OP_NO_TLSv1))
 320                                         {
 321                                         type=3;
 322                                         tls1=1;
 323                                         }
 324                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 325                                         type=3;
 326                                 }
 327                         else if (!(s->options & SSL_OP_NO_SSLv3))
 328                                 type=3;
 329                         }
 330                 else if ((strncmp("GET ", (char *)p,4) == 0) ||
 331                          (strncmp("POST ",(char *)p,5) == 0) ||
 332                          (strncmp("HEAD ",(char *)p,5) == 0) ||
 333                          (strncmp("PUT ", (char *)p,4) == 0))
 334                         {
 335                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
 336                         goto err;
 337                         }
 338                 else if (strncmp("CONNECT",(char *)p,7) == 0)
 339                         {
 340                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
 341                         goto err;
 342                         }
 343                 }
 344
 345 next_bit:
 346         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
 347                 {
 348                 /* we have a SSLv3/TLSv1 in a SSLv2 header */
 349                 type=2;
 350                 p=s->packet;
 351                 n=((p[0]&0x7f)<<8)|p[1];
 352                 if (n > (1024*4))
 353                         {
 354                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 355                         goto err;
 356                         }
 357
 358                 j=ssl23_read_bytes(s,n+2);
 359                 if (j <= 0) return(j);
 360
 361                 ssl3_finish_mac(s,&(s->packet[2]),s->packet_length-2);
 362
 363                 p=s->packet;
 364                 p+=5;
 365                 n2s(p,csl);
 366                 n2s(p,sil);
 367                 n2s(p,cl);
 368                 d=(unsigned char *)s->init_buf->data;
 369                 if ((csl+sil+cl+11) != s->packet_length)
 370                         {
 371                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 372                         goto err;
 373                         }
 374
 375                 *(d++)=SSL3_VERSION_MAJOR;
 376                 if (tls1)
 377                         *(d++)=TLS1_VERSION_MINOR;
 378                 else
 379                         *(d++)=SSL3_VERSION_MINOR;
 380
 381                 /* lets populate the random area */
 382                 /* get the chalenge_length */
 383                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
 384                 memset(d,0,SSL3_RANDOM_SIZE);
 385                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
 386                 d+=SSL3_RANDOM_SIZE;
 387
 388                 /* no session-id reuse */
 389                 *(d++)=0;
 390
 391                 /* ciphers */
 392                 j=0;
 393                 dd=d;
 394                 d+=2;
 395                 for (i=0; i<csl; i+=3)
 396                         {
 397                         if (p[i] != 0) continue;
 398                         *(d++)=p[i+1];
 399                         *(d++)=p[i+2];
 400                         j+=2;
 401                         }
 402                 s2n(j,dd);
 403
 404                 /* COMPRESSION */
 405                 *(d++)=1;
 406                 *(d++)=0;
 407
 408                 i=(d-(unsigned char *)s->init_buf->data);
 409
 410                 /* get the data reused from the init_buf */
 411                 s->s3->tmp.reuse_message=1;
 412                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
 413                 s->s3->tmp.message_size=i;
 414                 }
 415
 416         if (type == 1)
 417                 {
 418                 /* we are talking sslv2 */
 419                 /* we need to clean up the SSLv3/TLSv1 setup and put in the
 420                  * sslv2 stuff. */
 421
 422                 if (s->s2 == NULL)
 423                         {
 424                         if (!ssl2_new(s))
 425                                 goto err;
 426                         }
 427                 else
 428                         ssl2_clear(s);
 429
 430                 if (s->s3 != NULL) ssl3_free(s);
 431
 432                 if (!BUF_MEM_grow(s->init_buf,
 433                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 434                         {
 435                         goto err;
 436                         }
 437
 438                 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 439                 if ((s->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
 440                         use_sslv2_strong)
 441                         s->s2->ssl2_rollback=0;
 442                 else
 443                         s->s2->ssl2_rollback=1;
 444
 445                 /* setup the 5 bytes we have read so we get them from
 446                  * the sslv2 buffer */
 447                 s->rstate=SSL_ST_READ_HEADER;
 448                 s->packet_length=n;
 449                 s->packet= &(s->s2->rbuf[0]);
 450                 memcpy(s->packet,buf,n);
 451                 s->s2->rbuf_left=n;
 452                 s->s2->rbuf_offs=0;
 453
 454                 s->method=SSLv2_server_method();
 455                 s->handshake_func=s->method->ssl_accept;
 456                 }
 457
 458         if ((type == 2) || (type == 3))
 459                 {
 460                 /* we have SSLv3/TLSv1 */
 461
 462                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 463
 464                 /* we are in this state */
 465                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 466
 467                 if (type == 3)
 468                         {
 469                         /* put the 'n' bytes we have read into the input buffer
 470                          * for SSLv3 */
 471                         s->rstate=SSL_ST_READ_HEADER;
 472                         s->packet_length=n;
 473                         s->packet= &(s->s3->rbuf.buf[0]);
 474                         memcpy(s->packet,buf,n);
 475                         s->s3->rbuf.left=n;
 476                         s->s3->rbuf.offset=0;
 477                         }
 478                 else
 479                         {
 480                         s->packet_length=0;
 481                         s->s3->rbuf.left=0;
 482                         s->s3->rbuf.offset=0;
 483                         }
 484
 485                 if (tls1)
 486                         {
 487                         s->version=TLS1_VERSION;
 488                         s->method=TLSv1_server_method();
 489                         }
 490                 else
 491                         {
 492                         s->version=SSL3_VERSION;
 493                         s->method=SSLv3_server_method();
 494                         }
 495                 s->client_version=(v[0]<<8)|v[1];
 496                 s->handshake_func=s->method->ssl_accept;
 497                 }
 498
 499         if ((type < 1) || (type > 3))
 500                 {
 501                 /* bad, very bad */
 502                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 503                 goto err;
 504                 }
 505         s->init_num=0;
 506
 507         if (buf != buf_space) Free(buf);
 508         s->first_packet=1;
 509         return(SSL_accept(s));
 510 err:
 511         if (buf != buf_space) Free(buf);
 512         return(-1);
 513         }
 514