Thursday, May 29, 2008

Subject Name with Microsoft CA 2003

Today I had a challenge to find out how I can request a certificate from a Windows 2003 Server CA with a "free-style" subject name. MS CA is supporting and enforcing those attributes, enabled by default are EMail, CommonName, OrganizationalUnit, Organization, Locality,State, DomainComponent and Country. Optional you can allow Title, GivenName, Initials, Surname, StreetAddress, UnstructuredName, UnstructuredAddress and DeviceSerialNumber.
First I was wasting time to find a way how to extend that list, later I got an tipp that I can disbale the checking. to do so run Certutil –setreg ca\crlflags +CRLF_REBUILD_MODIFIED_SUBJECT_ONLY (see also

Now every subject name is accepted. :-)

Saturday, May 24, 2008

Is SSL secure? in addition

SSL is only secure as long your cryptographic toolset is secure. Actual you can find a big hole in Debian based systems (e.g. Debian, Ubuntu). It is not only a problem for SSL, also for SSH or OpenVPN. On SSH and OpenVPN you have that issue not only on the server, it is a client problem! My recommendation is to revoke all keys from which are created between September 2006 and May 2008. There are a few test programs on the Internet, I will get you more detail information if available. Please checkout also the Debian Wiki at .
This is realy a bad thing for OpenSource community.