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Use ASN1 UTC tags for dates before 2000

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Signed-off-by: Werner Lewis <werner.lewis@arm.com>
This commit is contained in:
Werner Lewis 2022-05-10 12:23:13 +01:00
parent 9bc53a2e84
commit acd01e58a3
4 changed files with 72 additions and 3 deletions
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3
ChangeLog.d/fix-time-format-pre-2000.txt Normal file
View file

@ -0,0 +1,3 @@
Bugfix
* Encode X.509 dates before 1/1/2000 as UTCTime rather than
GeneralizedTime. Fixes #5465.

2
library/x509write_crt.c
View file

@ -324,7 +324,7 @@ static int x509_write_time( unsigned char **p, unsigned char *start,
/*
* write MBEDTLS_ASN1_UTC_TIME if year < 2050 (2 bytes shorter)
*/
if( t[0] == '2' && t[1] == '0' && t[2] < '5' )
if( t[0] < '2' || ( t[0] == '2' && t[1] == '0' && t[2] < '5' ) )
{
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
(const unsigned char *) t + 2,

16
tests/suites/test_suite_x509write.data
View file

@ -58,6 +58,22 @@ Certificate write check Server1 SHA1
depends_on:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_MD5_C
x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:-1:"data_files/server1.crt":0:0:"data_files/test-ca.crt"
Certificate write check Server1 SHA1, not before 1970
depends_on:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_MD5_C
x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"19700210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:-1:"":0:0:"data_files/test-ca.crt"
Certificate write check Server1 SHA1, not after 2050
depends_on:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_MD5_C
x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20500210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:-1:"":0:0:"data_files/test-ca.crt"
Certificate write check Server1 SHA1, not before 1970, not after 2050
depends_on:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_MD5_C
x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"19700210144406":"20500210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:-1:"":0:0:"data_files/test-ca.crt"
Certificate write check Server1 SHA1, not before 2050, not after 2059
depends_on:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_MD5_C
x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20500210144406":"20590210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:-1:"":0:0:"data_files/test-ca.crt"
Certificate write check Server1 SHA1, key_usage
depends_on:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_MD5_C
x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:MBEDTLS_X509_KU_DIGITAL_SIGNATURE | MBEDTLS_X509_KU_NON_REPUDIATION | MBEDTLS_X509_KU_KEY_ENCIPHERMENT:1:0:0:1:-1:"data_files/server1.key_usage.crt":0:0:"data_files/test-ca.crt"

54
tests/suites/test_suite_x509write.function
View file

@ -242,8 +242,10 @@ void x509_crt_check( char *subject_key_file, char *subject_pwd,
mbedtls_x509write_cert crt;
unsigned char buf[4096];
unsigned char check_buf[5000];
unsigned char *p, *end;
unsigned char tag, sz;
mbedtls_mpi serial;
int ret;
int ret, before_tag, after_tag;
size_t olen = 0, pem_len = 0, buf_index = 0;
int der_len = -1;
FILE *f;
@ -374,7 +376,7 @@ void x509_crt_check( char *subject_key_file, char *subject_pwd,
TEST_EQUAL( flags, 0 );
TEST_EQUAL( ret, 0 );
}
else
else if( *cert_check_file != '\0' )
{
f = fopen( cert_check_file, "r" );
TEST_ASSERT( f != NULL );
@ -395,6 +397,54 @@ void x509_crt_check( char *subject_key_file, char *subject_pwd,
if( der_len == 0 )
goto exit;
// Not testing against file, check date format
if( *cert_check_file == '\0' )
{
// UTC tag if before 2050, 2 digits less for year
if( not_before[0] == '2' && ( not_before[1] > '0' || not_before[2] > '4' ) )
{
before_tag = MBEDTLS_ASN1_GENERALIZED_TIME;
}
else
{
before_tag = MBEDTLS_ASN1_UTC_TIME;
not_before += 2;
}
if( not_after[0] == '2' && ( not_after[1] > '0' || not_after[2] > '4' ) )
{
after_tag = MBEDTLS_ASN1_GENERALIZED_TIME;
}
else
{
after_tag = MBEDTLS_ASN1_UTC_TIME;
not_after += 2;
}
end = buf + sizeof( buf );
for( p = end - der_len ; p < end ; )
{
tag = *p++;
sz = *p++;
if( tag == MBEDTLS_ASN1_UTC_TIME || tag == MBEDTLS_ASN1_GENERALIZED_TIME )
{
// Check correct tag and time written
TEST_ASSERT( before_tag == tag );
TEST_ASSERT( memcmp( p, not_before, sz - 1 ) == 0 );
p += sz;
tag = *p++;
sz = *p++;
TEST_ASSERT( after_tag == tag );
TEST_ASSERT( memcmp( p, not_after, sz - 1 ) == 0 );
break;
}
// Increment if long form ASN1 length
if( sz & 0x80 )
p += sz & 0x0F;
if( tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
p += sz;
}
TEST_ASSERT( p < end );
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
// When using PSA crypto, RNG isn't controllable, result length isn't
// deterministic over multiple runs, removing a single byte isn't enough to