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Re:Using two-factor authentication for SSH by aroch on Tuesday January 12, 2016 @11:54AM (#10888509)
You can use yubi's PAM modules in conjunction with SSH PAM auth, no need to patch OpenSSH.

https://developers.yubico.com/yubico-pam/

Re:Using two-factor authentication for SSH by nickik on Tuesday January 12, 2016 @12:41PM (#10888878)
For Yubikey OTP, not U2F.