make more strict

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@18607 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/asn1/timegm.c

@@ -35,8 +35,6 @@
 
 RCSID("$Id$");
 
-#ifndef HAVE_TIMEGM
-
 static int
 is_leap(unsigned y)
 {
@@ -44,6 +42,12 @@ is_leap(unsigned y)
     return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0);
 }
 
+/* 
+ * This is a simplifed version of _der_timegm that doesn't accept out
+ * of bound values that timegm(3) normally accepts but those are not
+ * valid in asn1 encodings.
+ */
+
 time_t
 _der_timegm (struct tm *tm)
 {
@@ -53,10 +57,18 @@ _der_timegm (struct tm *tm)
   time_t res = 0;
   unsigned i;
 
-  /* XXX this is wrong, needs to handle out of range
-   * months, days, hours, min, sec */ 
+  if (tm->tm_year < 0) 
+      return -1;
   if (tm->tm_mon < 0 || tm->tm_mon > 11) 
       return -1;
+  if (tm->tm_mday < 1 || tm->tm_mday > ndays[is_leap(tm->tm_year)][tm->tm_mon])
+      return -1;
+  if (tm->tm_hour < 0 || tm->tm_hour > 23) 
+      return -1;
+  if (tm->tm_min < 0 || tm->tm_min > 59) 
+      return -1;
+  if (tm->tm_sec < 0 || tm->tm_sec > 59) 
+      return -1;
 
   for (i = 70; i < tm->tm_year; ++i)
     res += is_leap(i) ? 366 : 365;
@@ -72,5 +84,3 @@ _der_timegm (struct tm *tm)
   res += tm->tm_sec;
   return res;
 }
-
-#endif /* HAVE_TIMEGM */