[Bug 3748] "webauthn-sk-ecdsa-sha2-nistp256 at openssh.com" signature type not supported from ssh agent

bugzilla-daemon at mindrot.org bugzilla-daemon at mindrot.org
Tue Nov 25 14:05:12 AEDT 2025


https://bugzilla.mindrot.org/show_bug.cgi?id=3748

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
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   Attachment #3894|0                           |1
        is obsolete|                            |

--- Comment #15 from Damien Miller <djm at mindrot.org> ---
Created attachment 3922
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3922&action=edit
accept webauthn signatures by default

I don't think the changes to sshkey_check_sigtype() are correct.
Implicitly accepting webauthn signatures there would make it impossible
for an administrator to disable webauthn signatures.

IMO it's better to explicitly enable it by default. This means adding a
corresponding signature type for certificate keys that can be used when
advertising support for them (e.g. in the host key algorithms KEXINIT
field)

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