I will take a look on it. Thanks. Can you explain it a little bit more what you mean with "You can either add a custom extension or just parse the structure from the extentsion contents." ? -----Ursprüngliche Nachricht----- Von: openssl-users [mailto:openssl-users-bounces@xxxxxxxxxxx] Im Auftrag von Dr. Stephen Henson Gesendet: Dienstag, 9. Mai 2017 18:06 An: openssl-users@xxxxxxxxxxx Betreff: Re: C++ How to parse Subject Directory Attributes Extension? On Tue, May 09, 2017, Matthias Ballreich wrote: > Here are nor some more details, which may help you to better understand. > > > My Certificate contains the SubjectDirectoryAttributes-Extension with the following Attributes: > > OID : Value > ------------------------------------------------------------------- > (1.3.6.1.5.5.7.9.4) countryOfCitizenship : DE > (1.3.6.1.5.5.7.9.3) gender : F > (1.3.6.1.5.5.7.9.1) dateOfBirth : 1971-10-14 12:00:00 UTC > (1.3.6.1.5.5.7.9.2) placeOfBirth : Darmstadt > > So i want to get these pairs of OID and Value. > > I found no Struct like SUBJECT_DIRECTORY_ATTRIBUTES in the Source-Code i can use. I got the Extension this way: > > int loc = X509_get_ext_by_NID(certificate, > NID_subject_directory_attributes, -1); X509_EXTENSION *ex = > X509_get_ext(certificate, loc); > > But how can i get then all the data, which means all the OIDs and Values to the OIDs? The ASN.1 Structure is: > > SubjectDirectoryAttributes ::= Attributes > > Attributes ::= SEQUENCE SIZE (1..MAX) OF Attribute > > Attribute ::= SEQUENCE > { > type AttributeType > values SET OF AttributeValue > } > > AttributeType ::= OBJECT IDENTIFIER > AttributeValue ::= ANY DEFINED BY AttributeType > > I found out that i get a custom extension with: X509_EXTENSION_get_object(ex) and that the OpenSSL-Type X509_NAME_ENTRY is the equvivalent to the ASN.1-Structure Attribute resp. AttributeTypeAndValue. So i tried to cast the result of X509_EXTENSION_get_data(ex) to a STACK_OF(X509_NAME_ENTRY) and to X509_NAME. But X509_NAME is the same as STACK_OF(X509_NAME_ENTRY). > > Then i tried to get the number of attributes by calling the sk_X509_NAME_ENTRY_num() function on the STACK_OF(X509_NAME_ENTRY) resp. X509_NAME.entries, but i got not the right number. I expect to get the number 3 or 4 (don't know the exactly internal counting - but the example cert contains 4 Attributes, so the output should be 3 or 4 depending if the counting will start at 0 or 1). But instead of 3 or 4 i got a much larger number like 34335029 and this number is different every time i run the code. So i think there is a problem with the casting or i did not choose the right Data-Type(s). > > I'm using OpenSSL 1.0.2j. > > So what's wrong and how can i fix it? - Thanks in advice! > Looks like the type isn't X509_NAME_ENTRY but X509_ATTRIBUTE and the extension is a SEQUENCE OF Attribute. We don't have the direct equivalent as a specific type IIRC but it isn't hard to add one just follow what is done for GENERAL_NAMES which is a SEQUENCE OF GENERAL_NAME. You can either add a custom extension or just parse the structure from the extentsion contents. Steve. -- Dr Stephen N. Henson. OpenSSL project core developer. Commercial tech support now available see: http://www.openssl.org -- openssl-users mailing list To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users -- openssl-users mailing list To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
