Line data    Source code

       1             : /*
       2             :  * Copyright (c) 1997 Kungliga Tekniska Högskolan
       3             :  * (Royal Institute of Technology, Stockholm, Sweden).
       4             :  * All rights reserved.
       5             :  *
       6             :  * Redistribution and use in source and binary forms, with or without
       7             :  * modification, are permitted provided that the following conditions
       8             :  * are met:
       9             :  *
      10             :  * 1. Redistributions of source code must retain the above copyright
      11             :  *    notice, this list of conditions and the following disclaimer.
      12             :  *
      13             :  * 2. Redistributions in binary form must reproduce the above copyright
      14             :  *    notice, this list of conditions and the following disclaimer in the
      15             :  *    documentation and/or other materials provided with the distribution.
      16             :  *
      17             :  * 3. Neither the name of the Institute nor the names of its contributors
      18             :  *    may be used to endorse or promote products derived from this software
      19             :  *    without specific prior written permission.
      20             :  *
      21             :  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
      22             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      23             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      24             :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
      25             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      26             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      27             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      28             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      29             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      30             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      31             :  * SUCH DAMAGE.
      32             :  */
      33             : 
      34             : #include "der_locl.h"
      35             : 
      36             : #define ASN1_MAX_YEAR   2000
      37             : 
      38             : static int
      39   161244681 : is_leap(unsigned y)
      40             : {
      41   161244681 :     y += 1900;
      42   156667074 :     return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0);
      43             : }
      44             : 
      45             : static const unsigned ndays[2][12] ={
      46             :     {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
      47             :     {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
      48             : 
      49             : /*
      50             :  * This is a simplifed version of timegm(3) that doesn't accept out of
      51             :  * bound values that timegm(3) normally accepts but those are not
      52             :  * valid in asn1 encodings.
      53             :  */
      54             : 
      55             : time_t
      56      996199 : _der_timegm (struct tm *tm)
      57             : {
      58      996199 :   time_t res = 0;
      59       35787 :   int i;
      60             : 
      61             :   /*
      62             :    * See comment in _der_gmtime
      63             :    */
      64      996199 :   if (tm->tm_year > ASN1_MAX_YEAR)
      65          33 :       return 0;
      66             : 
      67      996166 :   if (tm->tm_year < 0)
      68           3 :       return -1;
      69      996163 :   if (tm->tm_mon < 0 || tm->tm_mon > 11)
      70           0 :       return -1;
      71     1031950 :   if (tm->tm_mday < 1 || tm->tm_mday > (int)ndays[is_leap(tm->tm_year)][tm->tm_mon])
      72           0 :       return -1;
      73      996163 :   if (tm->tm_hour < 0 || tm->tm_hour > 23)
      74           0 :       return -1;
      75      996163 :   if (tm->tm_min < 0 || tm->tm_min > 59)
      76           0 :       return -1;
      77      996163 :   if (tm->tm_sec < 0 || tm->tm_sec > 59)
      78           0 :       return -1;
      79             : 
      80    40368256 :   for (i = 70; i < tm->tm_year; ++i)
      81    39717379 :     res += is_leap(i) ? 366 : 365;
      82             : 
      83     8091360 :   for (i = 0; i < tm->tm_mon; ++i)
      84     7350325 :     res += ndays[is_leap(tm->tm_year)][i];
      85      996163 :   res += tm->tm_mday - 1;
      86      996163 :   res *= 24;
      87      996163 :   res += tm->tm_hour;
      88      996163 :   res *= 60;
      89      996163 :   res += tm->tm_min;
      90      996163 :   res *= 60;
      91      996163 :   res += tm->tm_sec;
      92      996163 :   return res;
      93             : }
      94             : 
      95             : struct tm *
      96     2464860 : _der_gmtime(time_t t, struct tm *tm)
      97             : {
      98     2464860 :     time_t secday = t % (3600 * 24);
      99     2464860 :     time_t days = t / (3600 * 24);
     100             : 
     101     2464860 :     memset(tm, 0, sizeof(*tm));
     102             : 
     103     2464860 :     tm->tm_sec = secday % 60;
     104     2464860 :     tm->tm_min = (secday % 3600) / 60;
     105     2464860 :     tm->tm_hour = (int)(secday / 3600);
     106             : 
     107             :     /*
     108             :      * Refuse to calculate time ~ 2000 years into the future, this is
     109             :      * not possible for systems where time_t is a int32_t, however,
     110             :      * when time_t is a int64_t, that can happen, and this becomes a
     111             :      * denial of sevice.
     112             :      */
     113     2464860 :     if (days > (ASN1_MAX_YEAR * 365))
     114           0 :         return NULL;
     115             : 
     116     2464860 :     tm->tm_year = 70;
     117    96090316 :     while(1) {
     118    95246186 :         unsigned dayinyear = (is_leap(tm->tm_year) ? 366 : 365);
     119    95184310 :         if (days < dayinyear)
     120     2377446 :             break;
     121    92719450 :         tm->tm_year += 1;
     122    92719450 :         days -= dayinyear;
     123             :     }
     124     2377446 :     tm->tm_mon = 0;
     125             : 
     126    16797992 :     while (1) {
     127    18596918 :         unsigned daysinmonth = ndays[is_leap(tm->tm_year)][tm->tm_mon];
     128    18596918 :         if (days < daysinmonth)
     129     2377446 :             break;
     130    16132058 :         days -= daysinmonth;
     131    16132058 :         tm->tm_mon++;
     132             :     }
     133     2464860 :     tm->tm_mday = (int)(days + 1);
     134             : 
     135     2464860 :     return tm;
     136             : }