2022-08-23 10:06:44 +02:00
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#cloud-config
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ssh_genkeytypes: [ecdsa, ed25519]
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# upgrade system
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package_update: true
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package_upgrade: true
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# various dependencies
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packages:
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- ca-certificates
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- curl
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- gnupg
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- lsb-release
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- fail2ban
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- nginx
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- certbot
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- python3-certbot-nginx
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- iptables-persistent
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2022-08-27 17:16:12 +02:00
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- unattended-upgrades
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- apt-listchanges
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2022-08-23 10:06:44 +02:00
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write_files:
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- path: /etc/iptables/rules.v4
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permissions: 0644
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owner: root:root
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content: |
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*filter
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:INPUT DROP [0:0]
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:FORWARD DROP [0:0]
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:OUTPUT ACCEPT [0:0]
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-A INPUT -i lo -j ACCEPT
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-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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-A INPUT -m conntrack --ctstate INVALID -j DROP
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-A INPUT -p tcp -m tcp --dport 22 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
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-A INPUT -p tcp -m tcp --dport 8448 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
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-A OUTPUT -o lo -j ACCEPT
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-A OUTPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT
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-A OUTPUT -p tcp -m tcp --sport 22 -m conntrack --ctstate ESTABLISHED -j ACCEPT
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-A OUTPUT -p tcp -m tcp --dport 25 -j REJECT --reject-with icmp-port-unreachable
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COMMIT
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- path: /etc/systemd/journald.conf.d/size.conf
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permissions: 0644
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owner: root:root
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content: |
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[Journal]
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SystemMaxUse=250M
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SystemMaxFileSize=50M
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- path: /etc/fstab
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append: true
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content: |
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/swapfile swap swap defaults 0 0
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2022-08-27 17:16:12 +02:00
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- path: /etc/apt/apt.conf.d/20auto-upgrades
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permissions: 0644
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owner: root:root
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content: |
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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::AutocleanInterval "7";
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2022-08-23 10:06:44 +02:00
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runcmd:
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- 'iptables-restore < /etc/iptables/rules.v4'
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- [systemctl, enable, --now, fail2ban]
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- 'fallocate -l 3G /swapfile'
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- 'chmod 600 /swapfile'
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- 'mkswap /swapfile'
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- 'swapon /swapfile'
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2022-08-23 11:34:56 +02:00
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- [curl, https://git.unitoo.it/unitoo/configurations/raw/branch/master/ssh/etc/ssh/sshd_config, --output, /etc/ssh/sshd_config.d/99-hardening.conf]
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2022-08-23 10:06:44 +02:00
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- [systemctl, restart, ssh]
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2022-08-23 11:34:56 +02:00
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- [curl, https://git.unitoo.it/unitoo/configurations/raw/branch/master/modprobe/etc/modprobe.d/disable-network-filesystems.conf, --output, /etc/modprobe.d/disable-network-filesystems.conf]
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- [curl, https://git.unitoo.it/unitoo/configurations/raw/branch/master/modprobe/etc/modprobe.d/disable-rare-filesystems.conf, --output, /etc/modprobe.d/disable-rare-filesystems.conf]
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- [curl, https://git.unitoo.it/unitoo/configurations/raw/branch/master/modprobe/etc/modprobe.d/disable-rare-protocols.conf, --output, /etc/modprobe.d/disable-rare-protocols.conf]
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- [curl, https://git.unitoo.it/unitoo/configurations/raw/branch/master/modprobe/etc/modprobe.d/disable-vivid.conf, --output, /etc/modprobe.d/disable-vivid.conf]
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2022-08-23 10:06:44 +02:00
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2022-08-23 11:34:56 +02:00
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- [curl, https://git.unitoo.it/unitoo/configurations/raw/branch/master/sysctl/etc/sysctl.conf, --output, /etc/sysctl.d/99-hardening.conf]
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2022-08-23 10:06:44 +02:00
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- [sysctl, -p]
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2022-08-27 17:16:12 +02:00
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- [sed, -r, -i, 's/\/\/Unattended-Upgrade::Mail\ "";/Unattended-Upgrade::Mail\ "root";/', /etc/apt/apt.conf.d/50unattended-upgrades]
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2022-08-23 10:06:44 +02:00
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- [timedatectl, set-timezone, Europe/Rome]
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