[cabfpub] ASN.1 Default Values

[Enric Castillo]

Hi,

We've received recently a bug from one of our partners, about a bad 
encoding of our CRL, specifically the value onlyContainsCACerts that is 
set "false", that has the same default value.

/   IssuingDistributionPoint ::= SEQUENCE {
         distributionPoint          [0] DistributionPointName OPTIONAL,
         onlyContainsUserCerts      [1] BOOLEAN DEFAULT FALSE,
         onlyContainsCACerts        [2] BOOLEAN DEFAULT FALSE,
         onlySomeReasons            [3] ReasonFlags OPTIONAL,
         indirectCRL                [4] BOOLEAN DEFAULT FALSE,
         onlyContainsAttributeCerts [5] BOOLEAN DEFAULT FALSE }

         -- at most one of onlyContainsUserCerts, onlyContainsCACerts,
         -- and onlyContainsAttributeCerts may be set to TRUE./

I've read the ASN.1 Encoding Rules ( 
http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf ):
/11.5 Set and sequence components with default value
             The encoding of a set value or sequence value shall not 
include an encoding for any component value which is equal to its 
default value.
/

Then, our CRL is wrong.

Also I've saw that a recent bugzila ( 
https://bugzilla.mozilla.org/show_bug.cgi?id=988633 ) was opened to 
discuss a similar trouble, in terms that also affect ANF AC, because the 
basic constraints are being malformated also. It seems that is a common 
badformating, both certificates and CRL of many CA/B Forum members.


The reason why we included this fields is to emphasize some field that 
we think that are important.

What position takes CA/B Forum?


Thanks,
Enric
-- 

ANF Autoridad de Certificación

*Enric Castillo*
Departamento de Ingeniería
ANF Autoridad de Certificación
enric.castillo at anf.es <mailto:enric.castillo at anf.es>
www.anf.es <https://www.anf.es>

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