#cloud-config

ssh_genkeytypes: [ecdsa, ed25519]

# upgrade system
package_update: true
package_upgrade: true

# various dependencies
packages:
  - ca-certificates
  - curl
  - gnupg
  - lsb-release
  - fail2ban

write_files:
  - path: /etc/iptables/rules.v4
    permissions: 0644
    owner: root:root
    content: |
      *filter
      :INPUT DROP [0:0]
      :FORWARD DROP [0:0]
      :OUTPUT ACCEPT [0:0]
      -A INPUT -i lo -j ACCEPT
      -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
      -A INPUT -m conntrack --ctstate INVALID -j DROP
      -A INPUT -p tcp -m tcp --dport 22 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
      -A OUTPUT -o lo -j ACCEPT
      -A OUTPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT
      -A OUTPUT -p tcp -m tcp --sport 22 -m conntrack --ctstate ESTABLISHED -j ACCEPT
      -A OUTPUT -p tcp -m tcp --dport 25 -j REJECT --reject-with icmp-port-unreachable
      COMMIT
  - path: /etc/iptables/rules.v6
    permissions: 0644
    owner: root:root
    content: |
      *filter
      :INPUT DROP [0:0]
      :FORWARD DROP [0:0]
      :OUTPUT ACCEPT [0:0]
      -A INPUT -i tun0 -j ACCEPT
      -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
      -A INPUT -m conntrack --ctstate INVALID -j DROP
      -A OUTPUT -o tun0 -j ACCEPT
      -A OUTPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT
      -A OUTPUT -p tcp -m tcp --dport 25 -j REJECT --reject-with icmp6-port-unreachable
      COMMIT


runcmd:
  - 'iptables-restore < /etc/iptables/rules.v4'
  - 'ip6tables-restore < /etc/iptables/rules.v6'

  - [systemctl, enable, --now, fail2ban]

  - [curl, https://gitea.it/Unitoo/dot-files/raw/branch/master/ssh/etc/ssh/sshd_config, --output, /etc/ssh/sshd_config.d/99-hardening.conf]
  - [systemctl, restart, ssh]

  - [curl, https://gitea.it/Unitoo/dot-files/raw/branch/master/modprobe/etc/modprobe.d/disable-network-filesystems.conf, --output, /etc/modprobe.d/disable-network-filesystems.conf]
  - [curl, https://gitea.it/Unitoo/dot-files/raw/branch/master/modprobe/etc/modprobe.d/disable-rare-filesystems.conf, --output, /etc/modprobe.d/disable-rare-filesystems.conf]
  - [curl, https://gitea.it/Unitoo/dot-files/raw/branch/master/modprobe/etc/modprobe.d/disable-rare-protocols.conf, --output, /etc/modprobe.d/disable-rare-protocols.conf]
  - [curl, https://gitea.it/Unitoo/dot-files/raw/branch/master/modprobe/etc/modprobe.d/disable-vivid.conf, --output, /etc/modprobe.d/disable-vivid.conf]

  - [curl, https://gitea.it/Unitoo/dot-files/raw/branch/master/sysctl/etc/sysctl.conf, --output, /etc/sysctl.d/99-hardening.conf]
  - [sysctl, -p]

  - [mkdir, -p, /usr/local/apt-keys]
  - [gpg, --fetch-keys, https://neilalexander.s3.dualstack.eu-west-2.amazonaws.com/deb/key.txt]
  - 'gpg --export 569130E8CA20FBC4CB3FDE555898470A764B32C9 | tee /usr/local/apt-keys/yggdrasil-keyring.gpg > /dev/null'
  - "echo 'deb [signed-by=/usr/local/apt-keys/yggdrasil-keyring.gpg] http://neilalexander.s3.dualstack.eu-west-2.amazonaws.com/deb/ debian yggdrasil' | tee /etc/apt/sources.list.d/yggdrasil.list"
  - [apt-get, update]
  - [apt-get, install, -y, yggdrasil]
  - [sed, -r, -i, 's/Peers:\s\[\]/Peers: [\n\ttls:\/\/[2001:470:1f13:e56::64]:39575\n\ttls:\/\/s2.i2pd.xyz:39575\n\ttls:\/\/51.255.223.60:54232\n\ttls:\/\/45.147.198.155:6010\n\ttls:\/\/ygg1.ezdomain.ru:11130\n\ttls:\/\/ygg.mkg20001.io:443\n  ]/', /etc/yggdrasil.conf]
  - [systemctl, enable, --now, yggdrasil]

  - [mkdir, -p, /etc/apt/keyrings]
  - "curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg"
  - 'echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null'
  - [chmod, a+r, /etc/apt/keyrings/docker.gpg]
  - [apt-get, update]
  - 'apt-get install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin'