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Correctly handle leap year in x509_date_is_valid()

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This patch ensures that invalid dates on leap years with 100 or 400
years intervals are handled correctly.
This commit is contained in:
Andres Amaya Garcia 2016-11-21 15:38:02 +00:00 • committed by Simon Butcher
parent b0f148c0ab
commit 735b37eeef
3 changed files with 28 additions and 4 deletions
library
x509.c

14
library/x509.c
View file

@ -496,9 +496,10 @@ static int x509_parse_int( unsigned char **p, size_t n, int *res )
return( 0 );
}
static int x509_date_is_valid(const mbedtls_x509_time *t)
static int x509_date_is_valid(const mbedtls_x509_time *t )
{
int ret = MBEDTLS_ERR_X509_INVALID_DATE;
int month_len;
CHECK_RANGE( 0, 9999, t->year );
CHECK_RANGE( 0, 23, t->hour );
@ -508,17 +509,22 @@ static int x509_date_is_valid(const mbedtls_x509_time *t)
switch( t->mon )
{
case 1: case 3: case 5: case 7: case 8: case 10: case 12:
CHECK_RANGE( 1, 31, t->day );
month_len = 31;
break;
case 4: case 6: case 9: case 11:
CHECK_RANGE( 1, 30, t->day );
month_len = 30;
break;
case 2:
CHECK_RANGE( 1, 28 + (t->year % 4 == 0), t->day );
if( ( !( t->year % 4 ) && t->year % 100 ) ||
!( t->year % 400 ) )
month_len = 29;
else
month_len = 28;
break;
default:
return( ret );
}
CHECK_RANGE( 1, month_len, t->day );
return( 0 );
}