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Add check for validity of date in x509_get_time()

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Andres AG 2016-09-23 13:16:02 +01:00
parent 93012e8bce
commit 4b76aecaf3
4 changed files with 104 additions and 0 deletions
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2
ChangeLog
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@ -29,6 +29,8 @@ Bugfix
a contribution from Tobias Tangemann. #541
* Fixed cert_app sample program for debug output and for use when no root
certificates are provided.
* Fix check for validity of date when parsing in mbedtls_x509_get_time().
Found by subramanyam-c.
Changes
* Extended test coverage of special cases, and added new timing test suite.

32
library/x509.c
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@ -80,6 +80,7 @@
#endif
#define CHECK(code) if( ( ret = code ) != 0 ){ return( ret ); }
#define CHECK_RANGE(min, max, val) if( val < min || val > max ){ return( ret ); }
/*
* CertificateSerialNumber ::= INTEGER
@ -489,6 +490,33 @@ static int x509_parse_int(unsigned char **p, unsigned n, int *res){
return 0;
}
static int x509_date_is_valid(const mbedtls_x509_time *time)
{
int ret = MBEDTLS_ERR_X509_INVALID_DATE;
CHECK_RANGE( 0, 9999, time->year );
CHECK_RANGE( 0, 23, time->hour );
CHECK_RANGE( 0, 59, time->min );
CHECK_RANGE( 0, 59, time->sec );
switch( time->mon )
{
case 1: case 3: case 5: case 7: case 8: case 10: case 12:
CHECK_RANGE( 1, 31, time->day );
break;
case 4: case 6: case 9: case 11:
CHECK_RANGE( 1, 30, time->day );
break;
case 2:
CHECK_RANGE( 1, 28 + (time->year % 4 == 0), time->day );
break;
default:
return( ret );
}
return( 0 );
}
/*
* Time ::= CHOICE {
* utcTime UTCTime,
@ -528,6 +556,8 @@ int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end,
time->year += 100 * ( time->year < 50 );
time->year += 1900;
CHECK( x509_date_is_valid( time ) );
return( 0 );
}
else if( tag == MBEDTLS_ASN1_GENERALIZED_TIME )
@ -548,6 +578,8 @@ int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end,
if( len > 14 && *(*p)++ != 'Z' )
return( MBEDTLS_ERR_X509_INVALID_DATE );
CHECK( x509_date_is_valid( time ) );
return( 0 );
}
else

36
tests/suites/test_suite_x509parse.data
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@ -1526,3 +1526,39 @@ x509parse_crt_file:"data_files/server7_all_space.crt":MBEDTLS_ERR_PEM_INVALID_DA
X509 File parse (trailing spaces, OK)
depends_on:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_SHA256_C
x509parse_crt_file:"data_files/server7_trailing_space.crt":0
X509 Get time (UTC no issues)
depends_on:MBEDTLS_X509_USE_C
x509_get_time:MBEDTLS_ASN1_UTC_TIME:"500101000000Z":0:1950:1:1:0:0:0
X509 Get time (Generalized Time no issues)
depends_on:MBEDTLS_X509_USE_C
x509_get_time:MBEDTLS_ASN1_GENERALIZED_TIME:"99991231235959Z":0:9999:12:31:23:59:59
X509 Get time (UTC year without leap day)
depends_on:MBEDTLS_X509_USE_C
x509_get_time:MBEDTLS_ASN1_UTC_TIME:"490229121212Z":MBEDTLS_ERR_X509_INVALID_DATE:0:0:0:0:0:0
X509 Get time (UTC year with leap day)
depends_on:MBEDTLS_X509_USE_C
x509_get_time:MBEDTLS_ASN1_UTC_TIME:"000229121212Z":0:2000:2:29:12:12:12
X509 Get time (UTC invalid day of month #1)
depends_on:MBEDTLS_X509_USE_C
x509_get_time:MBEDTLS_ASN1_UTC_TIME:"000132121212Z":MBEDTLS_ERR_X509_INVALID_DATE:0:0:0:0:0:0
X509 Get time (UTC invalid day of month #2)
depends_on:MBEDTLS_X509_USE_C
x509_get_time:MBEDTLS_ASN1_UTC_TIME:"001131121212Z":MBEDTLS_ERR_X509_INVALID_DATE:0:0:0:0:0:0
X509 Get time (UTC invalid hour)
depends_on:MBEDTLS_X509_USE_C
x509_get_time:MBEDTLS_ASN1_UTC_TIME:"001130241212Z":MBEDTLS_ERR_X509_INVALID_DATE:0:0:0:0:0:0
X509 Get time (UTC invalid min)
depends_on:MBEDTLS_X509_USE_C
x509_get_time:MBEDTLS_ASN1_UTC_TIME:"001130236012Z":MBEDTLS_ERR_X509_INVALID_DATE:0:0:0:0:0:0
X509 Get time (UTC invalid sec)
depends_on:MBEDTLS_X509_USE_C
x509_get_time:MBEDTLS_ASN1_UTC_TIME:"001130235960Z":MBEDTLS_ERR_X509_INVALID_DATE:0:0:0:0:0:0

34
tests/suites/test_suite_x509parse.function
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@ -1,4 +1,5 @@
/* BEGIN_HEADER */
#include "mbedtls/x509.h"
#include "mbedtls/x509_crt.h"
#include "mbedtls/x509_crl.h"
#include "mbedtls/x509_csr.h"
@ -590,6 +591,39 @@ exit:
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_X509_USE_C */
void x509_get_time( int tag, char *time_str, int ret,
int year, int mon, int day,
int hour, int min, int sec )
{
mbedtls_x509_time time;
unsigned char buf[17];
unsigned char* start = buf;
unsigned char* end = buf;
memset( &time, 0x00, sizeof( time ) );
*end = (unsigned char)tag; end++;
if( tag == MBEDTLS_ASN1_UTC_TIME )
*end = 13;
else
*end = 15;
end++;
memcpy( end, time_str, (size_t)*(end - 1) );
end += *(end - 1);
TEST_ASSERT( mbedtls_x509_get_time( &start, end, &time ) == ret );
if( ret == 0 )
{
TEST_ASSERT( year == time.year );
TEST_ASSERT( mon == time.mon );
TEST_ASSERT( day == time.day );
TEST_ASSERT( hour == time.hour );
TEST_ASSERT( min == time.min );
TEST_ASSERT( sec == time.sec );
}
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_X509_RSASSA_PSS_SUPPORT */
void x509_parse_rsassa_pss_params( char *hex_params, int params_tag,
int ref_msg_md, int ref_mgf_md,