Config Howdy for Fedora 36 using GNOME

ConfigHowdy.sh

# !/bin/bash
# Reference: https://copr.fedorainfracloud.org/coprs/principis/howdy/

# sudo required
if ! [ $(id -u) = 0 ]; then
   echo "Root privilege is needed. Please rerun the script as root." >&2
   exit 1
fi

SUDO_CFG="/etc/pam.d/sudo"
GDM_CFG="/etc/pam.d/gdm-password"
SUDO_PATTERN='1i\' # Append to the first line
GDM_PATTERN='/auth.*substack.*password-auth/i\' # Append before password-auth line
HOWDY_PAM="auth        sufficient    pam_python.so /lib64/security/howdy/pam.py"
HOWDY_DLIB="/lib64/security/howdy/dlib-data"

# Configure sudo
sed -i "$SUDO_PATTERN$HOWDY_PAM" $SUDO_CFG

# Configure GDM
sed -i "$GDM_PATTERN$HOWDY_PAM" $GDM_CFG

# Configure Permission
chmod o+x $HOWDY_DLIB

# Configure SELinux
MODULE=$(cat << EOF
module howdy 1.0;

require {
    type lib_t;
    type xdm_t;
    type v4l_device_t;
    type sysctl_vm_t;
    class chr_file map;
    class file { create getattr open read write };
    class dir add_name;
}

#============= xdm_t ==============
allow xdm_t lib_t:dir add_name;
allow xdm_t lib_t:file { create write };
allow xdm_t sysctl_vm_t:file { getattr open read };
allow xdm_t v4l_device_t:chr_file map;
EOF
)

echo "$MODULE" > howdy.te
checkmodule -M -m -o howdy.mod howdy.te
semodule_package -o howdy.pp -m howdy.mod
semodule -i howdy.pp
rm howdy.te howdy.mod howdy.pp

# Done!
echo Done. Please restart terminal to check sudo result.

Note this script only configures Howdy with the system. It only solves the issue when Howdy is not complaining about an error, but simply doesn't show up when needed for authentication. It does not configure Howdy itself. You'll probably still need to select a working IR camera in Howdy config yourself.