A Two-Factor auth app for AsteroidOS
Proper time set (including the time zone)
R1: The prover (e.g., token, soft token) and verifier (authentication or validation server) MUST know or be able to derive the current Unix time (i.e., the number of seconds elapsed since midnight UTC of January 1, 1970) for OTP generation. See [UT] for a more detailed definition of the commonly known "Unix time". The precision of the time used by the prover affects how often the clock synchronization should be done; see Section 6.
You may want ntp to keep your clock synced. At one point, AsteroidOS shipped
with an ntp client configured, but it looks like that is no longer the case.
AsteroidOS doesn't seem to have an NTP client in its repos either (as of
2021-04-08), but I've built it; you can get it from the repos at
https://home.chandlerswift.com/asteroid/ -- just update
/etc/opkg/base-feeds.conf to point at my repos, opkg update, and
opkg install ntp.
mkdir build
cd build
qmake ..
make
TOTP code based on https://github.com/RavuAlHemio/cpptotp