ssl/s23_srvr.c

   1 /* ssl/s23_srvr.c */
   2 /* Copyright (C) 1995-1997 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 == 2)
  78                 return(SSLv2_server_method());
  79         else if (ver == 3)
  80                 return(SSLv3_server_method());
  81         else
  82                 return(NULL);
  83         }
  84
  85 SSL_METHOD *SSLv23_server_method()
  86         {
  87         static int init=1;
  88         static SSL_METHOD SSLv23_server_data;
  89
  90         if (init)
  91                 {
  92                 init=0;
  93                 memcpy((char *)&SSLv23_server_data,
  94                         (char *)sslv23_base_method(),sizeof(SSL_METHOD));
  95                 SSLv23_server_data.ssl_accept=ssl23_accept;
  96                 SSLv23_server_data.get_ssl_method=ssl23_get_server_method;
  97                 }
  98         return(&SSLv23_server_data);
  99         }
 100
 101 int ssl23_accept(s)
 102 SSL *s;
 103         {
 104         BUF_MEM *buf;
 105         unsigned long Time=time(NULL);
 106         void (*cb)()=NULL;
 107         int ret= -1;
 108         int new_state,state;
 109
 110         RAND_seed((unsigned char *)&Time,sizeof(Time));
 111         ERR_clear_error();
 112         errno=0;
 113
 114         if (s->info_callback != NULL)
 115                 cb=s->info_callback;
 116         else if (s->ctx->info_callback != NULL)
 117                 cb=s->ctx->info_callback;
 118
 119         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 120         s->in_handshake++;
 121
 122         for (;;)
 123                 {
 124                 state=s->state;
 125
 126                 switch(s->state)
 127                         {
 128                 case SSL_ST_BEFORE:
 129                 case SSL_ST_ACCEPT:
 130                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 131                 case SSL_ST_OK|SSL_ST_ACCEPT:
 132
 133                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 134
 135                         s->version=3;
 136                         s->type=SSL_ST_ACCEPT;
 137
 138                         if (s->init_buf == NULL)
 139                                 {
 140                                 if ((buf=BUF_MEM_new()) == NULL)
 141                                         {
 142                                         ret= -1;
 143                                         goto end;
 144                                         }
 145                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 146                                         {
 147                                         ret= -1;
 148                                         goto end;
 149                                         }
 150                                 s->init_buf=buf;
 151                                 }
 152
 153                         ssl3_init_finished_mac(s);
 154
 155                         s->state=SSL23_ST_SR_CLNT_HELLO_A;
 156                         s->ctx->sess_accept++;
 157                         s->init_num=0;
 158                         break;
 159
 160                 case SSL23_ST_SR_CLNT_HELLO_A:
 161                 case SSL23_ST_SR_CLNT_HELLO_B:
 162
 163                         s->shutdown=0;
 164                         ret=ssl23_get_client_hello(s);
 165                         if (ret >= 0) cb=NULL;
 166                         goto end;
 167                         break;
 168
 169                 default:
 170                         SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
 171                         ret= -1;
 172                         goto end;
 173                         /* break; */
 174                         }
 175
 176                 if ((cb != NULL) && (s->state != state))
 177                         {
 178                         new_state=s->state;
 179                         s->state=state;
 180                         cb(s,SSL_CB_ACCEPT_LOOP,1);
 181                         s->state=new_state;
 182                         }
 183                 }
 184 end:
 185         if (cb != NULL)
 186                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 187         s->in_handshake--;
 188         return(ret);
 189         }
 190
 191
 192 int ssl23_get_client_hello(s)
 193 SSL *s;
 194         {
 195         char buf_space[8];
 196         char *buf= &(buf_space[0]);
 197         unsigned char *p,*d,*dd;
 198         unsigned int i;
 199         unsigned int csl,sil,cl;
 200         int n=0,j;
 201         BIO *bbio;
 202         int type=0,use_sslv2_strong=0;
 203
 204         /* read the initial header */
 205         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
 206                 {
 207                 if (!ssl3_setup_buffers(s)) goto err;
 208
 209                 n=ssl23_read_bytes(s,7);
 210                 if (n != 7) return(n);
 211
 212                 p=s->packet;
 213
 214                 memcpy(buf,p,n);
 215
 216                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
 217                         {
 218                         /* SSLv2 header */
 219                         if ((p[3] == 0x00) && (p[4] == 0x02))
 220                                 {
 221                                 /* SSLv2 */
 222                                 type=1;
 223                                 }
 224                         else if (p[3] == SSL3_VERSION_MAJOR)
 225                                 {
 226                                 if (s->ctx->options & SSL_OP_NON_EXPORT_FIRST)
 227                                         {
 228                                         STACK *sk;
 229                                         SSL_CIPHER *c;
 230                                         int ne2,ne3;
 231
 232                                         j=((p[0]&0x7f)<<8)|p[1];
 233                                         if (j > (1024*4))
 234                                                 {
 235                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 236                                                 goto err;
 237                                                 }
 238
 239                                         n=ssl23_read_bytes(s,j+2);
 240                                         if (n <= 0) return(n);
 241                                         p=s->packet;
 242
 243                                         if ((buf=Malloc(n)) == NULL)
 244                                                 {
 245                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 246                                                 goto err;
 247                                                 }
 248                                         memcpy(buf,p,n);
 249
 250                                         p+=5;
 251                                         n2s(p,csl);
 252                                         p+=4;
 253
 254                                         sk=ssl_bytes_to_cipher_list(
 255                                                 s,p,csl,NULL);
 256                                         if (sk != NULL)
 257                                                 {
 258                                                 ne2=ne3=0;
 259                                                 for (j=0; j<sk_num(sk); j++)
 260                                                         {
 261                                                         c=(SSL_CIPHER *)sk_value(sk,j);
 262                                                         if (!(c->algorithms & SSL_EXP))
 263                                                                 {
 264                                                                 if ((c->id>>24L) == 2L)
 265                                                                         ne2=1;
 266                                                                 else
 267                                                                         ne3=1;
 268                                                                 }
 269                                                         }
 270                                                 if (ne2 && !ne3)
 271                                                         {
 272                                                         type=1;
 273                                                         use_sslv2_strong=1;
 274                                                         goto next_bit;
 275                                                         }
 276                                                 }
 277                                         }
 278                                 /* SSLv3 */
 279                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 280                                 }
 281                         }
 282                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 283                          (p[1] == SSL3_VERSION_MAJOR) &&
 284                          (p[5] == SSL3_MT_CLIENT_HELLO))
 285                         {
 286                         /* true SSLv3 */
 287                         type=3;
 288                         }
 289                 /* I will not introduce error codes since that will probably
 290                  * disrupt the error codes alread allocated and could play
 291                  * havoc with dynamic allocation.  Upgrade to 0.9.x :-)
 292                  */
 293                 else if ((strncmp("GET ", (char *)p,4) == 0) ||
 294                          (strncmp("POST ",(char *)p,5) == 0) ||
 295                          (strncmp("HEAD ",(char *)p,5) == 0) ||
 296                          (strncmp("PUT ", (char *)p,4) == 0))
 297                         {
 298                         goto err;
 299                         }
 300                 else if (strncmp("CONNECT",(char *)p,7) == 0)
 301                         {
 302                         goto err;
 303                         }
 304                 }
 305
 306 next_bit:
 307         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
 308                 {
 309                 /* we have a SSLv3 in a SSLv2 header */
 310                 type=2;
 311                 p=s->packet;
 312                 n=((p[0]&0x7f)<<8)|p[1];
 313                 if (n > (1024*4))
 314                         {
 315                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 316                         goto err;
 317                         }
 318
 319                 j=ssl23_read_bytes(s,n+2);
 320                 if (j <= 0) return(j);
 321
 322                 ssl3_finish_mac(s,&(s->packet[2]),s->packet_length-2);
 323
 324                 p=s->packet;
 325                 p+=5;
 326                 n2s(p,csl);
 327                 n2s(p,sil);
 328                 n2s(p,cl);
 329                 d=(unsigned char *)s->init_buf->data;
 330                 if ((csl+sil+cl+11) != s->packet_length)
 331                         {
 332                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 333                         goto err;
 334                         }
 335
 336                 *(d++)=SSL3_VERSION_MAJOR;
 337                 *(d++)=SSL3_VERSION_MINOR;
 338
 339                 /* lets populate the random area */
 340                 /* get the chalenge_length */
 341                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
 342                 memset(d,0,SSL3_RANDOM_SIZE);
 343                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
 344                 d+=SSL3_RANDOM_SIZE;
 345
 346                 /* no session-id reuse */
 347                 *(d++)=0;
 348
 349                 /* ciphers */
 350                 j=0;
 351                 dd=d;
 352                 d+=2;
 353                 for (i=0; i<csl; i+=3)
 354                         {
 355                         if (p[i] != 0) continue;
 356                         *(d++)=p[i+1];
 357                         *(d++)=p[i+2];
 358                         j+=2;
 359                         }
 360                 s2n(j,dd);
 361
 362                 /* compression */
 363                 *(d++)=1;
 364                 *(d++)=0;
 365
 366                 i=(d-(unsigned char *)s->init_buf->data);
 367
 368                 /* get the data reused from the init_buf */
 369                 s->s3->tmp.reuse_message=1;
 370                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
 371                 s->s3->tmp.message_size=i;
 372                 }
 373
 374         if (type == 1)
 375                 {
 376                 /* we are talking sslv2 */
 377                 /* we need to clean up the SSLv3 setup and put in the
 378                  * sslv2 stuff. */
 379
 380                 if (s->s2 == NULL)
 381                         {
 382                         if (!ssl2_new(s))
 383                                 goto err;
 384                         }
 385                 else
 386                         ssl2_clear(s);
 387
 388                 if (s->s3 != NULL) ssl3_free(s);
 389
 390                 if (!BUF_MEM_grow(s->init_buf,
 391                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 392                         {
 393                         goto err;
 394                         }
 395
 396                 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 397                 if ((s->ctx->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
 398                         use_sslv2_strong)
 399                         s->s2->ssl2_rollback=0;
 400                 else
 401                         s->s2->ssl2_rollback=1;
 402
 403                 /* setup the 5 bytes we have read so we get them from
 404                  * the sslv2 buffer */
 405                 s->rstate=SSL_ST_READ_HEADER;
 406                 s->packet_length=n;
 407                 s->packet= &(s->s2->rbuf[0]);
 408                 memcpy(s->packet,buf,n);
 409                 s->s2->rbuf_left=n;
 410                 s->s2->rbuf_offs=0;
 411
 412                 s->method=SSLv2_server_method();
 413                 s->handshake_func=s->method->ssl_accept;
 414                 }
 415
 416         if ((type == 2) || (type == 3))
 417                 {
 418                 /* we have sslv3 */
 419
 420                 if (s->bbio == NULL)
 421                         {
 422                         bbio=BIO_new(BIO_f_buffer());
 423                         if (bbio == NULL)
 424                                 goto err;
 425                         s->bbio=bbio;
 426                         }
 427                 else
 428                         bbio=s->bbio;
 429                 BIO_reset(bbio);
 430                 if (!BIO_set_write_buffer_size(bbio,16*1024))
 431                         goto err;
 432                 s->wbio=BIO_push(bbio,s->wbio);
 433
 434                 /* we are in this state */
 435                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 436
 437                 if (type == 3)
 438                         {
 439                         /* put the 'n' bytes we have read into the input buffer
 440                          * for SSLv3 */
 441                         s->rstate=SSL_ST_READ_HEADER;
 442                         s->packet_length=n;
 443                         s->packet= &(s->s3->rbuf.buf[0]);
 444                         memcpy(s->packet,buf,n);
 445                         s->s3->rbuf.left=n;
 446                         s->s3->rbuf.offset=0;
 447                         }
 448                 else
 449                         {
 450                         s->packet_length=0;
 451                         s->s3->rbuf.left=0;
 452                         s->s3->rbuf.offset=0;
 453                         }
 454
 455                 s->method=SSLv3_server_method();
 456                 s->handshake_func=s->method->ssl_accept;
 457                 }
 458
 459         if ((type < 1) || (type > 3))
 460                 {
 461                 /* bad, very bad */
 462                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 463                 goto err;
 464                 }
 465         s->init_num=0;
 466
 467         if (buf != buf_space) Free(buf);
 468         s->first_packet=1;
 469         return(SSL_accept(s));
 470 err:
 471         if (buf != buf_space) Free(buf);
 472         return(-1);
 473         }
 474