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+{ pkgs, ... }:
+# Enables second factor for ssh password login
+
+## Usage:
+# gen-oath-safe <username> totp
+## scan the qrcode with google authenticator (or FreeOTP)
+## copy last line into secrets/<host>/users.oath (chmod 700)
+{
+ security.pam.oath = {
+ # enabling it will make it a requisite of `all` services
+ # enable = true;
+ digits = 6;
+ # TODO assert existing
+ usersFile = (toString <secrets>) + "/users.oath";
+ };
+ # I want TFA only active for sshd with password-auth
+ security.pam.services.sshd.oathAuth = true;
+}