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_add(&Time,sizeof(Time),0);
 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                              * We can detect SSL 3.0/TLS 1.0 Client Hellos only
 191                              * when the following is in a single record
 192                              * (not guaranteed by protocol specs):
 193                              * Byte  Content
 194                              *  0     type            \
 195                              *  1/2   version          > record header
 196                              *  3/4   length          /
 197                              *  5     msg_type        \
 198                              *  6-8   length           > Client Hello message
 199                              *  9/10  client_version  /
 200                              */
 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;
 206         int type=0,use_sslv2_strong=0;
 207         int v[2];
 208
 209         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
 210                 {
 211                 /* read the initial header */
 212                 v[0]=v[1]=0;
 213
 214                 if (!ssl3_setup_buffers(s)) goto err;
 215
 216                 n=ssl23_read_bytes(s, sizeof buf_space);
 217                 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
 218
 219                 p=s->packet;
 220
 221                 memcpy(buf,p,n);
 222
 223                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
 224                         {
 225                         /*
 226                          * SSLv2 header
 227                          */
 228                         if ((p[3] == 0x00) && (p[4] == 0x02))
 229                                 {
 230                                 v[0]=p[3]; v[1]=p[4];
 231                                 /* SSLv2 */
 232                                 if (!(s->options & SSL_OP_NO_SSLv2))
 233                                         type=1;
 234                                 }
 235                         else if (p[3] == SSL3_VERSION_MAJOR)
 236                                 {
 237                                 v[0]=p[3]; v[1]=p[4];
 238                                 /* SSLv3/TLSv1 */
 239                                 if (p[4] >= TLS1_VERSION_MINOR)
 240                                         {
 241                                         if (!(s->options & SSL_OP_NO_TLSv1))
 242                                                 {
 243                                                 s->version=TLS1_VERSION;
 244                                                 /* type=2; */ /* done later to survive restarts */
 245                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
 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                                                 {
 255                                                 type=1;
 256                                                 }
 257                                         }
 258                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 259                                         {
 260                                         s->version=SSL3_VERSION;
 261                                         /* type=2; */
 262                                         s->state=SSL23_ST_SR_CLNT_HELLO_B;
 263                                         }
 264                                 else if (!(s->options & SSL_OP_NO_SSLv2))
 265                                         type=1;
 266
 267                                 if (s->options & SSL_OP_NON_EXPORT_FIRST)
 268                                         /* Not only utterly confusing, but broken
 269                                          * ('fractured programming'?) -- the details
 270                                          * of this block nearly make it work
 271                                          * as intended in this environment, but on one
 272                                          * of the fine points (w.r.t. restarts) it fails.
 273                                          * The obvious fix would be even more devastating
 274                                          * to program structure; if you want the functionality,
 275                                          * throw this away and implement it in a way
 276                                          * that makes sense */
 277                                         {
 278                                         STACK_OF(SSL_CIPHER) *sk;
 279                                         SSL_CIPHER *c;
 280                                         int ne2,ne3;
 281
 282                                         j=((p[0]&0x7f)<<8)|p[1];
 283                                         if (j > (1024*4))
 284                                                 {
 285                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 286                                                 goto err;
 287                                                 }
 288
 289                                         n=ssl23_read_bytes(s,j+2);
 290                                         if (n <= 0) return(n);
 291                                         p=s->packet;
 292
 293                                         if ((buf=Malloc(n)) == NULL)
 294                                                 {
 295                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 296                                                 goto err;
 297                                                 }
 298                                         memcpy(buf,p,n);
 299
 300                                         p+=5;
 301                                         n2s(p,csl);
 302                                         p+=4;
 303
 304                                         sk=ssl_bytes_to_cipher_list(
 305                                                 s,p,csl,NULL);
 306                                         if (sk != NULL)
 307                                                 {
 308                                                 ne2=ne3=0;
 309                                                 for (j=0; j<sk_SSL_CIPHER_num(sk); j++)
 310                                                         {
 311                                                         c=sk_SSL_CIPHER_value(sk,j);
 312                                                         if (!SSL_C_IS_EXPORT(c))
 313                                                                 {
 314                                                                 if ((c->id>>24L) == 2L)
 315                                                                         ne2=1;
 316                                                                 else
 317                                                                         ne3=1;
 318                                                                 }
 319                                                         }
 320                                                 if (ne2 && !ne3)
 321                                                         {
 322                                                         type=1;
 323                                                         use_sslv2_strong=1;
 324                                                         goto next_bit;
 325                                                         }
 326                                                 }
 327                                         }
 328                                 }
 329                         }
 330                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
 331                          (p[1] == SSL3_VERSION_MAJOR) &&
 332                          (p[5] == SSL3_MT_CLIENT_HELLO) &&
 333                          (p[9] == p[1]))
 334                         {
 335                         /*
 336                          * SSLv3 or tls1 header
 337                          */
 338
 339                         /* we must look at client_version inside the client hello: */
 340                         v[0]=p[9]; v[1]=p[10];
 341                         if (v[1] >= TLS1_VERSION_MINOR)
 342                                 {
 343                                 if (!(s->options & SSL_OP_NO_TLSv1))
 344                                         {
 345                                         s->version=TLS1_VERSION;
 346                                         type=3;
 347                                         }
 348                                 else if (!(s->options & SSL_OP_NO_SSLv3))
 349                                         {
 350                                         s->version=SSL3_VERSION;
 351                                         type=3;
 352                                         }
 353                                 }
 354                         else if (!(s->options & SSL_OP_NO_SSLv3))
 355                                 {
 356                                 s->version=SSL3_VERSION;
 357                                 type=3;
 358                                 }
 359                         }
 360                 else if ((strncmp("GET ", (char *)p,4) == 0) ||
 361                          (strncmp("POST ",(char *)p,5) == 0) ||
 362                          (strncmp("HEAD ",(char *)p,5) == 0) ||
 363                          (strncmp("PUT ", (char *)p,4) == 0))
 364                         {
 365                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
 366                         goto err;
 367                         }
 368                 else if (strncmp("CONNECT",(char *)p,7) == 0)
 369                         {
 370                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
 371                         goto err;
 372                         }
 373                 }
 374
 375 next_bit:
 376         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
 377                 {
 378                 /* we have SSLv3/TLSv1 in an SSLv2 header
 379                  * (other cases skip this state) */
 380
 381                 type=2;
 382                 p=s->packet;
 383                 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
 384                 v[1] = p[4];
 385
 386                 n=((p[0]&0x7f)<<8)|p[1];
 387                 if (n > (1024*4))
 388                         {
 389                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
 390                         goto err;
 391                         }
 392
 393                 j=ssl23_read_bytes(s,n+2);
 394                 if (j <= 0) return(j);
 395
 396                 ssl3_finish_mac(s,&(s->packet[2]),s->packet_length-2);
 397
 398                 p=s->packet;
 399                 p+=5;
 400                 n2s(p,csl);
 401                 n2s(p,sil);
 402                 n2s(p,cl);
 403                 d=(unsigned char *)s->init_buf->data;
 404                 if ((csl+sil+cl+11) != s->packet_length)
 405                         {
 406                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
 407                         goto err;
 408                         }
 409
 410                 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
 411                 *(d++) = v[1];
 412
 413                 /* lets populate the random area */
 414                 /* get the chalenge_length */
 415                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
 416                 memset(d,0,SSL3_RANDOM_SIZE);
 417                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
 418                 d+=SSL3_RANDOM_SIZE;
 419
 420                 /* no session-id reuse */
 421                 *(d++)=0;
 422
 423                 /* ciphers */
 424                 j=0;
 425                 dd=d;
 426                 d+=2;
 427                 for (i=0; i<csl; i+=3)
 428                         {
 429                         if (p[i] != 0) continue;
 430                         *(d++)=p[i+1];
 431                         *(d++)=p[i+2];
 432                         j+=2;
 433                         }
 434                 s2n(j,dd);
 435
 436                 /* COMPRESSION */
 437                 *(d++)=1;
 438                 *(d++)=0;
 439
 440                 i=(d-(unsigned char *)s->init_buf->data);
 441
 442                 /* get the data reused from the init_buf */
 443                 s->s3->tmp.reuse_message=1;
 444                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
 445                 s->s3->tmp.message_size=i;
 446                 }
 447
 448         /* imaginary new state (for program structure): */
 449         /* s->state = SSL23_SR_CLNT_HELLO_C */
 450
 451         if (type == 1)
 452                 {
 453                 /* we are talking sslv2 */
 454                 /* we need to clean up the SSLv3/TLSv1 setup and put in the
 455                  * sslv2 stuff. */
 456
 457                 if (s->s2 == NULL)
 458                         {
 459                         if (!ssl2_new(s))
 460                                 goto err;
 461                         }
 462                 else
 463                         ssl2_clear(s);
 464
 465                 if (s->s3 != NULL) ssl3_free(s);
 466
 467                 if (!BUF_MEM_grow(s->init_buf,
 468                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
 469                         {
 470                         goto err;
 471                         }
 472
 473                 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
 474                 if ((s->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
 475                         use_sslv2_strong)
 476                         s->s2->ssl2_rollback=0;
 477                 else
 478                         s->s2->ssl2_rollback=1;
 479
 480                 /* setup the n bytes we have read so we get them from
 481                  * the sslv2 buffer */
 482                 s->rstate=SSL_ST_READ_HEADER;
 483                 s->packet_length=n;
 484                 s->packet= &(s->s2->rbuf[0]);
 485                 memcpy(s->packet,buf,n);
 486                 s->s2->rbuf_left=n;
 487                 s->s2->rbuf_offs=0;
 488
 489                 s->method=SSLv2_server_method();
 490                 s->handshake_func=s->method->ssl_accept;
 491                 }
 492
 493         if ((type == 2) || (type == 3))
 494                 {
 495                 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
 496
 497                 if (!ssl_init_wbio_buffer(s,1)) goto err;
 498
 499                 /* we are in this state */
 500                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 501
 502                 if (type == 3)
 503                         {
 504                         /* put the 'n' bytes we have read into the input buffer
 505                          * for SSLv3 */
 506                         s->rstate=SSL_ST_READ_HEADER;
 507                         s->packet_length=n;
 508                         s->packet= &(s->s3->rbuf.buf[0]);
 509                         memcpy(s->packet,buf,n);
 510                         s->s3->rbuf.left=n;
 511                         s->s3->rbuf.offset=0;
 512                         }
 513                 else
 514                         {
 515                         s->packet_length=0;
 516                         s->s3->rbuf.left=0;
 517                         s->s3->rbuf.offset=0;
 518                         }
 519
 520                 if (s->version == TLS1_VERSION)
 521                         s->method = TLSv1_server_method();
 522                 else
 523                         s->method = SSLv3_server_method();
 524 #if 0 /* ssl3_get_client_hello does this */
 525                 s->client_version=(v[0]<<8)|v[1];
 526 #endif
 527                 s->handshake_func=s->method->ssl_accept;
 528                 }
 529
 530         if ((type < 1) || (type > 3))
 531                 {
 532                 /* bad, very bad */
 533                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
 534                 goto err;
 535                 }
 536         s->init_num=0;
 537
 538         if (buf != buf_space) Free(buf);
 539         s->first_packet=1;
 540         return(SSL_accept(s));
 541 err:
 542         if (buf != buf_space) Free(buf);
 543         return(-1);
 544         }