78 lines
3.1 KiB
Bash
Executable File
78 lines
3.1 KiB
Bash
Executable File
source setup/functions.sh # load our functions
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# Base system configuration.
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echo Updating system packages...
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hide_output apt-get update
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hide_output apt-get -y upgrade
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# Install basic utilities.
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#
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# haveged: Provides extra entropy to /dev/random so it doesn't stall
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# when generating random numbers for private keys (e.g. during
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# ldns-keygen).
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# unattended-upgrades: Apt tool to install security updates automatically.
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# ntp: keeps the system time correct
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# fail2ban: scans log files for repeated failed login attempts and blocks the remote IP at the firewall
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apt_install python3 python3-pip \
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wget curl \
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haveged unattended-upgrades ntp fail2ban
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# Allow apt to install system updates automatically every day.
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cat > /etc/apt/apt.conf.d/02periodic <<EOF;
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APT::Periodic::MaxAge "7";
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APT::Periodic::Update-Package-Lists "1";
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APT::Periodic::Unattended-Upgrade "1";
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APT::Periodic::Verbose "1";
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EOF
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if [ -z "$DISABLE_FIREWALL" ]; then
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# Turn on the firewall. First allow incoming SSH, then turn on the firewall.
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# Other ports will be opened at the point where we set up those services.
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#
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# Various virtualized environments like Docker and some VPSs don't provide
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# a kernel that supports iptables. To avoid error-like output in these cases,
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# let us disable the firewall.
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apt_install ufw
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ufw_allow ssh;
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ufw --force enable;
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fi
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# Resolve DNS using bind9 locally, rather than whatever DNS server is supplied
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# by the machine's network configuration. We do this to ensure that DNS queries
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# that *we* make (i.e. looking up other external domains) perform DNSSEC checks.
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# We could use Google's Public DNS, but we don't want to create a dependency on
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# Google per our goals of decentralization. bind9, as packaged for Ubuntu, has
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# DNSSEC enabled by default via "dnssec-validation auto".
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#
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# So we'll be running bind9 bound to 127.0.0.1 for locally-issued DNS queries
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# and nsd bound to the public ethernet interface for remote DNS queries asking
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# about our domain names. nsd is configured in dns.sh.
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#
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# About the settings:
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#
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# * RESOLVCONF=yes will have bind9 take over /etc/resolv.conf to tell
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# local services that DNS queries are handled on localhost.
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# * Adding -4 to OPTIONS will have bind9 not listen on IPv6 addresses
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# so that we're sure there's no conflict with nsd, our public domain
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# name server, on IPV6.
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# * The listen-on directive in named.conf.options restricts bind9 to
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# binding to the loopback interface instead of all interfaces.
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apt_install bind9 resolvconf
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tools/editconf.py /etc/default/bind9 \
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RESOLVCONF=yes \
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"OPTIONS=\"-u bind -4\""
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if ! grep -q "listen-on " /etc/bind/named.conf.options; then
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# Add a listen-on directive if it doesn't exist inside the options block.
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sed -i "s/^}/\n\tlisten-on { 127.0.0.1; };\n}/" /etc/bind/named.conf.options
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fi
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if [ -f /etc/resolvconf/resolv.conf.d/original ]; then
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echo "Archiving old resolv.conf (was /etc/resolvconf/resolv.conf.d/original, now /etc/resolvconf/resolv.conf.original)."
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mv /etc/resolvconf/resolv.conf.d/original /etc/resolvconf/resolv.conf.original
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fi
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restart_service bind9
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restart_service resolvconf
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