Thanks for the hint, got it working by not setting $SSH_SK_PROVIDER which I thought was necessary from the initial email As an aside, the error message for ed25519-sk not being supported could be more explicit currently it just exits after "You may need to touch ..." with debug its "debug1: client_converse: helper returned error -4" and the ssh-sk-helper logs: error: Security key provider "internal" returned failure -1 error: ssh-sk-helper: Enrollment failed: invalid format thanks, sean On Sun, Jan 12, 2020 at 3:22 PM Markus Friedl <mfriedl@xxxxxxxxx> wrote: > > You should use the provider library shipped > with openssh, because we did not update the initial version that’s included in libfido2 > > -m > > > Sean Liao <seankhliao@xxxxxxxxx> schrieb am Fr. 10. Jan. 2020 um 02:14: >> >> Hi, >> >> So I finally have time to test the u2f support >> but so far I haven't been very successful, >> Specifically, current HEAD has >> SSH_SK_VERSION_MAJOR 0x00040000 >> and I can't seem to find a matching libfido2 version, >> current HEAD of Yubico/libfido2 is 0x00020000 >> >> Is there a more up to date libfido2 >> or a particular commit of openssh-portable >> I should be using? >> >> thanks >> >> Sean >> _______________________________________________ >> openssh-unix-dev mailing list >> openssh-unix-dev@xxxxxxxxxxx >> https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev