A setup for ubuntu servers

ubuntu.sh

#!/usr/bin/env bash
set -e

printf -- "#########################################\n"
printf -- "# This script has only been tested with #\n"
printf -- "#             Ubuntu 20.04              #\n"
printf -- "#   It might work with other versions   #\n"
printf -- "#########################################\n\n"

###################################################################################
# If you add your public SSH-Key here, password authentication to the server      #
# will be disabled. Using password authentication is NOT recommend!               #
#                                                                                 #
# Remote login as 'root' is disabled by default. If you need to use the root user #
# directly (not recommend), use 'sudo -i' to become root when needed.             #
###################################################################################

export SCRIPT_USERNAME='michael'
export SCRIPT_SSH_KEY='ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMPyuOFkWQsezEhtCwUPdmmr2fK+iTDueO0nKgHKXjMz (michael.kilian2406@gmail.com)'
export SCRIPT_SSH_PORT='24695'

# allowed values: 'no' or 'yes'
# required for visual studio code remote development
export SCRIPT_ALLOW_TCP_FORWARDING='no'

# allowed values: 'no' or 'yes'
# will open ports:
# - 2377/TCP (for cluster management)
# - 7946 (TCP and UDP for communication among nodes)
# - 4789/UDP (for overlay network traffic)
export OPEN_DOCKER_SWARM_PORT='yes'

declare -a MULTIPLE_SSH_KEYS=(
  "${SCRIPT_SSH_KEY}"
  'ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIFY3fr0p6A2sdynhFyy1v7nkKbECnkg7PDf0iMRs/2p (reactiion@haze-productions.com GPG)'
  'ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDqxRv5hEdg+oVpAfEIepVmF3JZTiAOA4WCs2t51bnjV (reactiion@haze-productions.com)'
)

printf -- "- Adding user '$SCRIPT_USERNAME'...\n\n"
adduser --quiet --gecos "" $SCRIPT_USERNAME

clear;
printf -- "#########################################\n"
printf -- "# This script has only been tested with #\n"
printf -- "#             Ubuntu 20.04              #\n"
printf -- "#   It might work with other versions   #\n"
printf -- "#########################################\n\n"
printf -- "- Adding user '$SCRIPT_USERNAME'...ok\n"

cat <<EOF > /etc/apt/sources.list
deb mirror://mirrors.ubuntu.com/mirrors.txt focal main restricted universe multiverse
deb mirror://mirrors.ubuntu.com/mirrors.txt focal-updates main restricted universe multiverse
deb mirror://mirrors.ubuntu.com/mirrors.txt focal-backports main restricted universe multiverse
deb mirror://mirrors.ubuntu.com/mirrors.txt focal-security main restricted universe multiverse
EOF

gpasswd -a $SCRIPT_USERNAME sudo
gpasswd -a $SCRIPT_USERNAME www-data

cat <<'EOF' > /etc/apt/apt.conf.d/local
Dpkg::Options {
   "--force-confdef";
   "--force-confold";
}
EOF

cat <<EOF > /etc/sudoers.d/apt-toast
$SCRIPT_USERNAME ALL=NOPASSWD: /usr/bin/aptitude
$SCRIPT_USERNAME ALL=NOPASSWD: /usr/bin/apt-get
$SCRIPT_USERNAME ALL=NOPASSWD: /usr/bin/sudoedit
EOF

export DEBIAN_FRONTEND=noninteractive
apt-get -y update
apt-get -y install software-properties-common language-pack-en-base

timedatectl set-timezone Europe/Berlin
export LC_ALL='en_US.UTF-8'
export LANG='en_US.UTF-8'
update-locale LC_ALL="en_US.UTF-8" LANG="en_US.UTF-8"

apt-get -y update
apt-get -y upgrade
apt-get -y dist-upgrade
apt-get -y autoremove
apt-get -y install  autoconf \
                    automake \
                    borgbackup \
                    build-essential \
                    checkinstall \
                    clang \
                    cmake \
                    curl \
                    dbus \
                    docker-compose \
                    docker.io \
                    fish \
                    gcc \
                    g++ \
                    gettext \
                    git \
                    gnupg \
                    htop \
                    iftop \
                    jq \
                    landscape-common \
                    libcrypto++-dev \
                    libcurl4-openssl-dev \
                    libevent-dev \
                    libgd-dev \
                    libgeoip-dev \
                    libiw-dev \
                    libnghttp2-dev \
                    libprotobuf-dev \
                    libsqlite3-dev \
                    libssl-dev \
                    libtool \
                    libz-dev \
                    lua5.2 \
                    m4 \
                    man \
                    mosh \
                    musl-tools \
                    ncurses-dev \
                    ncurses-term \
                    netcat \
                    ntp \
                    pax \
                    pkg-config \
                    python3 \
                    python3-dev \
                    python3-pip \
                    rclone \
                    rsync \
                    secure-delete \
                    software-properties-common \
                    sudo \
                    tmux \
                    tree \
                    ufw \
                    vim \
                    wget \
                    wireguard-tools \
                    zsh

apt-get -y purge nginx
rm -rf /etc/nginx

usermod -aG docker $SCRIPT_USERNAME
systemctl enable --now docker

if [[ ! "${OPEN_DOCKER_SWARM_PORT}" =~ ^(yes)$ ]]; then
  docker network create webproxy  
fi

if ! [ -x "$(command -v gpg2)" ]; then
  ln -s $(which gpg) /usr/bin/gpg2
fi

pip3 install --upgrade pip
pip3 install --upgrade asciinema magic-wormhole python-swiftclient

curl https://rclone.org/install.sh | bash
curl -sSL http://git.io/git-extras-setup | bash

printf -- "ok\n"
curl -sSL http://git.io/git-extras-setup | bash

apt-get -yqq purge nginx nginx-common nginx-full
rm -rf /etc/nginx

printf -- "ok\n"
printf -- "- Configuring user profile..."

chsh -s $(which zsh) $SCRIPT_USERNAME

if [[ ! -z "$SCRIPT_SSH_KEY" ]]; then
  cd /home/$SCRIPT_USERNAME
  mkdir -p .ssh
  touch .ssh/authorized_keys .ssh/known_hosts
  
  for i in "${MULTIPLE_SSH_KEYS[@]}"
  do
    printf -- "${i}\n" >> .ssh/authorized_keys
  done
  
  chmod 700 .ssh
  chmod 600 .ssh/authorized_keys
  ssh-keyscan dev.unleashed.codes github.com gitlab.com > .ssh/known_hosts
fi

chown -R $SCRIPT_USERNAME: /home/$SCRIPT_USERNAME

printf -- "- Configuring openSSH server..."

cat <<'EOF' > /etc/ssh/sshd_config
HostKey /etc/ssh/ssh_host_ed25519_key
HostKey /etc/ssh/ssh_host_rsa_key

Port 22
LogLevel VERBOSE

RekeyLimit 1G 1H
KexAlgorithms curve25519-sha256@libssh.org
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com

MaxAuthTries 2
MaxSessions 5
ClientAliveInterval 30
ClientAliveCountMax 6
TCPKeepAlive no

UsePAM yes
PasswordAuthentication no
ChallengeResponseAuthentication no
PubkeyAuthentication yes
AuthenticationMethods publickey
PermitRootLogin No

AllowAgentForwarding yes
AllowTcpForwarding no
X11Forwarding no
PrintMotd no
Compression no
StreamLocalBindUnlink yes
EOF

cat <<'EOF' > /etc/ssh/ssh_config
HashKnownHosts yes
HostKeyAlgorithms ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,ssh-rsa
KexAlgorithms curve25519-sha256@libssh.org
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,umac-128@openssh.com
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com
EOF

if [ -z "$SCRIPT_SSH_KEY" ]; then
  sed -i "/AuthenticationMethods/s/publickey/publickey password/g" /etc/ssh/sshd_config
fi
if [[ ! -z "$SCRIPT_SSH_PORT" && "$SCRIPT_SSH_PORT" != "22" ]]; then
  sed -i "/Port/s/22/${SCRIPT_SSH_PORT}/g" /etc/ssh/sshd_config
fi
sed -i "/AllowTcpForwarding/s/no/${SCRIPT_ALLOW_TCP_FORWARDING}/g" /etc/ssh/sshd_config

cd /etc/ssh
shred -u ssh_host_*key*
ssh-keygen -t ed25519 -f ssh_host_ed25519_key -N ''
ssh-keygen -t rsa -b 4096 -f ssh_host_rsa_key -N ''
systemctl restart sshd

printf -- "ok\n"
printf -- "- Configuring firewall..."

ufw logging on
ufw default deny incoming
ufw default allow outgoing
ufw allow ssh/tcp
ufw allow 80/tcp
ufw allow 443/tcp

if [[ ! -z "${OPEN_DOCKER_SWARM_PORT}" && "${OPEN_DOCKER_SWARM_PORT}" == "yes" ]]; then
  ufw allow 2377/tcp
  ufw allow 7946/tcp
  ufw allow 7946/udp
  ufw allow 4789/udp
fi

if [[ ! -z "$SCRIPT_SSH_PORT" && "$SCRIPT_SSH_PORT" != "22" ]]; then
  ufw allow $SCRIPT_SSH_PORT/tcp
fi

ufw --force enable

printf -- "ok\n"


function from_mirror() {
    wget https://raw.githubusercontent.com/frk1/mirrors/master/$1 -O /usr/local/bin/$1 && chmod a+x /usr/local/bin/$1
}

from_mirror exa
from_mirror fd
from_mirror rg
from_mirror tokei
from_mirror bat

curl -fLo /usr/local/bin/yadm https://github.com/TheLocehiliosan/yadm/raw/master/yadm && chmod a+x /usr/local/bin/yadm

printf -- "=> Done!\n\n"