mailinabox/setup/system.sh

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source setup/functions.sh # load our functions
# Base system configuration.
apt-get -qq update
apt-get -qq -y upgrade
# Install openssh-server to ensure that the end result is consistent across all Mail-in-a-Boxes.
apt_install openssh-server
# Check that SSH login with password is disabled. Stop if it's enabled.
if grep -q "^PasswordAuthentication yes" /etc/ssh/sshd_config \
|| ! grep -q "^PasswordAuthentication no" /etc/ssh/sshd_config ; then
echo
echo "The SSH server on this machine permits password-based login."
echo "Add your SSH public key to $HOME/.ssh/authorized_keys, check"
echo "check that you can log in without a password, set the option"
echo "'PasswordAuthentication no' in /etc/ssh/sshd_config, and then"
echo "restart the openssh via 'sudo service ssh restart'"
exit
fi
# Install basic utilities.
apt_install python3 wget curl bind9-host
# Turn on basic services:
#
# ntp: keeps the system time correct
#
# fail2ban: scans log files for repeated failed login attempts and blocks the remote IP at the firewall
#
# These services don't need further configuration and are started immediately after installation.
apt_install ntp fail2ban
if [ -z "$DISABLE_FIREWALL" ]; then
# Turn on the firewall. First allow incoming SSH, then turn on the firewall.
# Other ports will be opened at the point where we set up those services.
#
# Various virtualized environments like Docker and some VPSs don't provide
# a kernel that supports iptables. To avoid error-like output in these cases,
# let us disable the firewall.
apt_install ufw
ufw_allow ssh;
ufw --force enable;
fi