64 lines
2.4 KiB
Bash
Executable File
64 lines
2.4 KiB
Bash
Executable File
source setup/functions.sh # load our functions
|
|
|
|
# Base system configuration.
|
|
|
|
apt-get -qq update
|
|
apt-get -qq -y upgrade
|
|
|
|
# Install basic utilities.
|
|
|
|
apt_install python3 python3-pip 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
|
|
|
|
# Resolve DNS using bind9 locally, rather than whatever DNS server is supplied
|
|
# by the machine's network configuration. We do this to ensure that DNS queries
|
|
# that *we* make (i.e. looking up other external domains) perform DNSSEC checks.
|
|
# We could use Google's Public DNS, but we don't want to create a dependency on
|
|
# Google per our goals of decentralization. bind9, as packaged for Ubuntu, has
|
|
# DNSSEC enabled by default via "dnssec-validation auto".
|
|
#
|
|
# So we'll be running bind9 bound to 127.0.0.1 for locally-issued DNS queries
|
|
# and nsd bound to the public ethernet interface for remote DNS queries asking
|
|
# about our domain names. nsd is configured in dns.sh.
|
|
#
|
|
# About the settings:
|
|
#
|
|
# * RESOLVCONF=yes will have bind9 take over /etc/resolv.conf to tell
|
|
# local services that DNS queries are handled on localhost.
|
|
# * Adding -4 to OPTIONS will have bind9 not listen on IPv6 addresses
|
|
# so that we're sure there's no conflict with nsd, our public domain
|
|
# name server, on IPV6.
|
|
# * The listen-on directive in named.conf.options restricts bind9 to
|
|
# binding to the loopback interface instead of all interfaces.
|
|
apt_install bind9
|
|
tools/editconf.py /etc/default/bind9 \
|
|
RESOLVCONF=yes \
|
|
"OPTIONS=\"-u bind -4\""
|
|
if ! grep -q "listen-on " /etc/bind/named.conf.options; then
|
|
# Add a listen-on directive if it doesn't exist inside the options block.
|
|
sed -i "s/^}/\n\tlisten-on { 127.0.0.1; };\n}/" /etc/bind/named.conf.options
|
|
fi
|
|
|
|
service bind9 restart
|