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s23_srvr.c
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1 /* ssl/s23_srvr.c */
2 /* Copyright (C) 1995-1998 Eric Young ([email protected])
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young ([email protected]).
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 ([email protected]).
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 ([email protected])"
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 ([email protected])"
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  * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  * notice, this list of conditions and the following disclaimer.
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  * notice, this list of conditions and the following disclaimer in
70  * the documentation and/or other materials provided with the
71  * distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  * software must display the following acknowledgment:
75  * "This product includes software developed by the OpenSSL Project
76  * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  * endorse or promote products derived from this software without
80  * prior written permission. For written permission, please contact
81  * [email protected].
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  * nor may "OpenSSL" appear in their names without prior written
85  * permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  * acknowledgment:
89  * "This product includes software developed by the OpenSSL Project
90  * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * ([email protected]). This product includes software written by Tim
108  * Hudson ([email protected]).
109  *
110  */
111 
112 #include <stdio.h>
113 #include "ssl_locl.h"
114 #include <openssl/buffer.h>
115 #include <openssl/rand.h>
116 #include <openssl/objects.h>
117 #include <openssl/evp.h>
118 #ifdef OPENSSL_FIPS
119 #include <openssl/fips.h>
120 #endif
121 
122 static const SSL_METHOD *ssl23_get_server_method(int ver);
123 int ssl23_get_client_hello(SSL *s);
124 static const SSL_METHOD *ssl23_get_server_method(int ver)
125  {
126 #ifndef OPENSSL_NO_SSL2
127  if (ver == SSL2_VERSION)
128  return(SSLv2_server_method());
129 #endif
130  if (ver == SSL3_VERSION)
131  return(SSLv3_server_method());
132  else if (ver == TLS1_VERSION)
133  return(TLSv1_server_method());
134  else if (ver == TLS1_1_VERSION)
135  return(TLSv1_1_server_method());
136  else if (ver == TLS1_2_VERSION)
137  return(TLSv1_2_server_method());
138  else
139  return(NULL);
140  }
141 
142 IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
143  ssl23_accept,
144  ssl_undefined_function,
145  ssl23_get_server_method)
146 
147 int ssl23_accept(SSL *s)
148  {
149  BUF_MEM *buf;
150  unsigned long Time=(unsigned long)time(NULL);
151  void (*cb)(const SSL *ssl,int type,int val)=NULL;
152  int ret= -1;
153  int new_state,state;
154 
155  RAND_add(&Time,sizeof(Time),0);
156  ERR_clear_error();
157  clear_sys_error();
158 
159  if (s->info_callback != NULL)
160  cb=s->info_callback;
161  else if (s->ctx->info_callback != NULL)
162  cb=s->ctx->info_callback;
163 
164  s->in_handshake++;
165  if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
166 
167  for (;;)
168  {
169  state=s->state;
170 
171  switch(s->state)
172  {
173  case SSL_ST_BEFORE:
174  case SSL_ST_ACCEPT:
175  case SSL_ST_BEFORE|SSL_ST_ACCEPT:
176  case SSL_ST_OK|SSL_ST_ACCEPT:
177 
178  s->server=1;
179  if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
180 
181  /* s->version=SSL3_VERSION; */
182  s->type=SSL_ST_ACCEPT;
183 
184  if (s->init_buf == NULL)
185  {
186  if ((buf=BUF_MEM_new()) == NULL)
187  {
188  ret= -1;
189  goto end;
190  }
191  if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
192  {
193  ret= -1;
194  goto end;
195  }
196  s->init_buf=buf;
197  }
198 
199  ssl3_init_finished_mac(s);
200 
201  s->state=SSL23_ST_SR_CLNT_HELLO_A;
202  s->ctx->stats.sess_accept++;
203  s->init_num=0;
204  break;
205 
206  case SSL23_ST_SR_CLNT_HELLO_A:
207  case SSL23_ST_SR_CLNT_HELLO_B:
208 
209  s->shutdown=0;
210  ret=ssl23_get_client_hello(s);
211  if (ret >= 0) cb=NULL;
212  goto end;
213  /* break; */
214 
215  default:
216  SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
217  ret= -1;
218  goto end;
219  /* break; */
220  }
221 
222  if ((cb != NULL) && (s->state != state))
223  {
224  new_state=s->state;
225  s->state=state;
226  cb(s,SSL_CB_ACCEPT_LOOP,1);
227  s->state=new_state;
228  }
229  }
230 end:
231  s->in_handshake--;
232  if (cb != NULL)
233  cb(s,SSL_CB_ACCEPT_EXIT,ret);
234  return(ret);
235  }
236 
237 
238 int ssl23_get_client_hello(SSL *s)
239  {
240  char buf_space[11]; /* Request this many bytes in initial read.
241  * We can detect SSL 3.0/TLS 1.0 Client Hellos
242  * ('type == 3') correctly only when the following
243  * is in a single record, which is not guaranteed by
244  * the protocol specification:
245  * Byte Content
246  * 0 type \
247  * 1/2 version > record header
248  * 3/4 length /
249  * 5 msg_type \
250  * 6-8 length > Client Hello message
251  * 9/10 client_version /
252  */
253  char *buf= &(buf_space[0]);
254  unsigned char *p,*d,*d_len,*dd;
255  unsigned int i;
256  unsigned int csl,sil,cl;
257  int n=0,j;
258  int type=0;
259  int v[2];
260 
261  if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
262  {
263  /* read the initial header */
264  v[0]=v[1]=0;
265 
266  if (!ssl3_setup_buffers(s)) goto err;
267 
268  n=ssl23_read_bytes(s, sizeof buf_space);
269  if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
270 
271  p=s->packet;
272 
273  memcpy(buf,p,n);
274 
275  if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
276  {
277  /*
278  * SSLv2 header
279  */
280  if ((p[3] == 0x00) && (p[4] == 0x02))
281  {
282  v[0]=p[3]; v[1]=p[4];
283  /* SSLv2 */
284  if (!(s->options & SSL_OP_NO_SSLv2))
285  type=1;
286  }
287  else if (p[3] == SSL3_VERSION_MAJOR)
288  {
289  v[0]=p[3]; v[1]=p[4];
290  /* SSLv3/TLSv1 */
291  if (p[4] >= TLS1_VERSION_MINOR)
292  {
293  if (p[4] >= TLS1_2_VERSION_MINOR &&
294  !(s->options & SSL_OP_NO_TLSv1_2))
295  {
296  s->version=TLS1_2_VERSION;
297  s->state=SSL23_ST_SR_CLNT_HELLO_B;
298  }
299  else if (p[4] >= TLS1_1_VERSION_MINOR &&
300  !(s->options & SSL_OP_NO_TLSv1_1))
301  {
302  s->version=TLS1_1_VERSION;
303  /* type=2; */ /* done later to survive restarts */
304  s->state=SSL23_ST_SR_CLNT_HELLO_B;
305  }
306  else if (!(s->options & SSL_OP_NO_TLSv1))
307  {
308  s->version=TLS1_VERSION;
309  /* type=2; */ /* done later to survive restarts */
310  s->state=SSL23_ST_SR_CLNT_HELLO_B;
311  }
312  else if (!(s->options & SSL_OP_NO_SSLv3))
313  {
314  s->version=SSL3_VERSION;
315  /* type=2; */
316  s->state=SSL23_ST_SR_CLNT_HELLO_B;
317  }
318  else if (!(s->options & SSL_OP_NO_SSLv2))
319  {
320  type=1;
321  }
322  }
323  else if (!(s->options & SSL_OP_NO_SSLv3))
324  {
325  s->version=SSL3_VERSION;
326  /* type=2; */
327  s->state=SSL23_ST_SR_CLNT_HELLO_B;
328  }
329  else if (!(s->options & SSL_OP_NO_SSLv2))
330  type=1;
331 
332  }
333  }
334  else if ((p[0] == SSL3_RT_HANDSHAKE) &&
335  (p[1] == SSL3_VERSION_MAJOR) &&
336  (p[5] == SSL3_MT_CLIENT_HELLO) &&
337  ((p[3] == 0 && p[4] < 5 /* silly record length? */)
338  || (p[9] >= p[1])))
339  {
340  /*
341  * SSLv3 or tls1 header
342  */
343 
344  v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
345  /* We must look at client_version inside the Client Hello message
346  * to get the correct minor version.
347  * However if we have only a pathologically small fragment of the
348  * Client Hello message, this would be difficult, and we'd have
349  * to read more records to find out.
350  * No known SSL 3.0 client fragments ClientHello like this,
351  * so we simply assume TLS 1.0 to avoid protocol version downgrade
352  * attacks. */
353  if (p[3] == 0 && p[4] < 6)
354  {
355 #if 0
356  SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
357  goto err;
358 #else
359  v[1] = TLS1_VERSION_MINOR;
360 #endif
361  }
362  /* if major version number > 3 set minor to a value
363  * which will use the highest version 3 we support.
364  * If TLS 2.0 ever appears we will need to revise
365  * this....
366  */
367  else if (p[9] > SSL3_VERSION_MAJOR)
368  v[1]=0xff;
369  else
370  v[1]=p[10]; /* minor version according to client_version */
371  if (v[1] >= TLS1_VERSION_MINOR)
372  {
373  if (v[1] >= TLS1_2_VERSION_MINOR &&
374  !(s->options & SSL_OP_NO_TLSv1_2))
375  {
376  s->version=TLS1_2_VERSION;
377  type=3;
378  }
379  else if (v[1] >= TLS1_1_VERSION_MINOR &&
380  !(s->options & SSL_OP_NO_TLSv1_1))
381  {
382  s->version=TLS1_1_VERSION;
383  type=3;
384  }
385  else if (!(s->options & SSL_OP_NO_TLSv1))
386  {
387  s->version=TLS1_VERSION;
388  type=3;
389  }
390  else if (!(s->options & SSL_OP_NO_SSLv3))
391  {
392  s->version=SSL3_VERSION;
393  type=3;
394  }
395  }
396  else
397  {
398  /* client requests SSL 3.0 */
399  if (!(s->options & SSL_OP_NO_SSLv3))
400  {
401  s->version=SSL3_VERSION;
402  type=3;
403  }
404  else if (!(s->options & SSL_OP_NO_TLSv1))
405  {
406  /* we won't be able to use TLS of course,
407  * but this will send an appropriate alert */
408  s->version=TLS1_VERSION;
409  type=3;
410  }
411  }
412  }
413  else if ((strncmp("GET ", (char *)p,4) == 0) ||
414  (strncmp("POST ",(char *)p,5) == 0) ||
415  (strncmp("HEAD ",(char *)p,5) == 0) ||
416  (strncmp("PUT ", (char *)p,4) == 0))
417  {
418  SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
419  goto err;
420  }
421  else if (strncmp("CONNECT",(char *)p,7) == 0)
422  {
423  SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
424  goto err;
425  }
426  }
427 
428 #ifdef OPENSSL_FIPS
429  if (FIPS_mode() && (s->version < TLS1_VERSION))
430  {
431  SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
432  SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
433  goto err;
434  }
435 #endif
436 
437  if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
438  {
439  /* we have SSLv3/TLSv1 in an SSLv2 header
440  * (other cases skip this state) */
441 
442  type=2;
443  p=s->packet;
444  v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
445  v[1] = p[4];
446 
447  n=((p[0]&0x7f)<<8)|p[1];
448  if (n > (1024*4))
449  {
450  SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
451  goto err;
452  }
453 
454  j=ssl23_read_bytes(s,n+2);
455  if (j <= 0) return(j);
456 
457  ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
458  if (s->msg_callback)
459  s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
460 
461  p=s->packet;
462  p+=5;
463  n2s(p,csl);
464  n2s(p,sil);
465  n2s(p,cl);
466  d=(unsigned char *)s->init_buf->data;
467  if ((csl+sil+cl+11) != s->packet_length) /* We can't have TLS extensions in SSL 2.0 format
468  * Client Hello, can we? Error condition should be
469  * '>' otherweise */
470  {
471  SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
472  goto err;
473  }
474 
475  /* record header: msg_type ... */
476  *(d++) = SSL3_MT_CLIENT_HELLO;
477  /* ... and length (actual value will be written later) */
478  d_len = d;
479  d += 3;
480 
481  /* client_version */
482  *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
483  *(d++) = v[1];
484 
485  /* lets populate the random area */
486  /* get the challenge_length */
487  i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
488  memset(d,0,SSL3_RANDOM_SIZE);
489  memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
490  d+=SSL3_RANDOM_SIZE;
491 
492  /* no session-id reuse */
493  *(d++)=0;
494 
495  /* ciphers */
496  j=0;
497  dd=d;
498  d+=2;
499  for (i=0; i<csl; i+=3)
500  {
501  if (p[i] != 0) continue;
502  *(d++)=p[i+1];
503  *(d++)=p[i+2];
504  j+=2;
505  }
506  s2n(j,dd);
507 
508  /* COMPRESSION */
509  *(d++)=1;
510  *(d++)=0;
511 
512 #if 0
513  /* copy any remaining data with may be extensions */
514  p = p+csl+sil+cl;
515  while (p < s->packet+s->packet_length)
516  {
517  *(d++)=*(p++);
518  }
519 #endif
520 
521  i = (d-(unsigned char *)s->init_buf->data) - 4;
522  l2n3((long)i, d_len);
523 
524  /* get the data reused from the init_buf */
525  s->s3->tmp.reuse_message=1;
526  s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
527  s->s3->tmp.message_size=i;
528  }
529 
530  /* imaginary new state (for program structure): */
531  /* s->state = SSL23_SR_CLNT_HELLO_C */
532 
533  if (type == 1)
534  {
535 #ifdef OPENSSL_NO_SSL2
536  SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
537  goto err;
538 #else
539  /* we are talking sslv2 */
540  /* we need to clean up the SSLv3/TLSv1 setup and put in the
541  * sslv2 stuff. */
542 
543  if (s->s2 == NULL)
544  {
545  if (!ssl2_new(s))
546  goto err;
547  }
548  else
549  ssl2_clear(s);
550 
551  if (s->s3 != NULL) ssl3_free(s);
552 
553  if (!BUF_MEM_grow_clean(s->init_buf,
554  SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
555  {
556  goto err;
557  }
558 
559  s->state=SSL2_ST_GET_CLIENT_HELLO_A;
560  if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3)
561  s->s2->ssl2_rollback=0;
562  else
563  /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
564  * (SSL 3.0 draft/RFC 2246, App. E.2) */
565  s->s2->ssl2_rollback=1;
566 
567  /* setup the n bytes we have read so we get them from
568  * the sslv2 buffer */
569  s->rstate=SSL_ST_READ_HEADER;
570  s->packet_length=n;
571  s->packet= &(s->s2->rbuf[0]);
572  memcpy(s->packet,buf,n);
573  s->s2->rbuf_left=n;
574  s->s2->rbuf_offs=0;
575 
576  s->method=SSLv2_server_method();
577  s->handshake_func=s->method->ssl_accept;
578 #endif
579  }
580 
581  if ((type == 2) || (type == 3))
582  {
583  /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
584 
585  if (!ssl_init_wbio_buffer(s,1)) goto err;
586 
587  /* we are in this state */
588  s->state=SSL3_ST_SR_CLNT_HELLO_A;
589 
590  if (type == 3)
591  {
592  /* put the 'n' bytes we have read into the input buffer
593  * for SSLv3 */
594  s->rstate=SSL_ST_READ_HEADER;
595  s->packet_length=n;
596  if (s->s3->rbuf.buf == NULL)
597  if (!ssl3_setup_read_buffer(s))
598  goto err;
599 
600  s->packet= &(s->s3->rbuf.buf[0]);
601  memcpy(s->packet,buf,n);
602  s->s3->rbuf.left=n;
603  s->s3->rbuf.offset=0;
604  }
605  else
606  {
607  s->packet_length=0;
608  s->s3->rbuf.left=0;
609  s->s3->rbuf.offset=0;
610  }
611  if (s->version == TLS1_2_VERSION)
612  s->method = TLSv1_2_server_method();
613  else if (s->version == TLS1_1_VERSION)
614  s->method = TLSv1_1_server_method();
615  else if (s->version == TLS1_VERSION)
616  s->method = TLSv1_server_method();
617  else
618  s->method = SSLv3_server_method();
619 #if 0 /* ssl3_get_client_hello does this */
620  s->client_version=(v[0]<<8)|v[1];
621 #endif
622  s->handshake_func=s->method->ssl_accept;
623  }
624 
625  if ((type < 1) || (type > 3))
626  {
627  /* bad, very bad */
628  SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
629  goto err;
630  }
631  s->init_num=0;
632 
633  if (buf != buf_space) OPENSSL_free(buf);
634  return(SSL_accept(s));
635 err:
636  if (buf != buf_space) OPENSSL_free(buf);
637  return(-1);
638  }
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