/etc/security/login_duo.conf is in login-duo 1.9.21-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | [duo]
; Duo integration key
ikey =
; Duo secret key
skey =
; Duo API host
host =
; Send command for Duo Push authentication
;pushinfo = yes
|