I just wondering why their is not support for X.509 certificates in the standard distribution of OpenSSH. I found http://roumenpetrov.info/openssh/ but this is not part the standard Debian distribution. Other idea is the integration with OpenSC but i don't have a smartcard on my vServer. A PAM module seems not available too. Solution, getting direct X.509 support in OpenSSH? Vote for it :)
We do not plan to support X.509 certificates in OpenSSH. Doing so would add a significant amount of complexity and would drastically increase our attack surface. We recommend users who have a strong need apply Roumen's patch (which was of good quality the last time I checked), but for the above reasons we won't be applying it to the version that we distribute it.
Mass update RESOLVED->CLOSED after release of openssh-5.1