Dominik Roth
c19ec14cfd
- Make unlock-luks work in minimal initramfs environment - Handle missing lsblk and systemd-ask-password --list - Try to use same SSH host key for dropbear and OpenSSH - Add clear documentation about fingerprint differences - Better error handling and debugging output 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
392 lines
13 KiB
Bash
Executable File
392 lines
13 KiB
Bash
Executable File
#!/bin/bash
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set -euo pipefail
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BANNER=$(cat << "EOF"
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:^7J5GB##&&##GPY?~:
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^75B&@@@@@@&&&@@@@@@@#GJ~:
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5&@@@&B5?7~^^^^^~!7YP#@@@@#!
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Y##P7^ :~JB#B!
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:: :
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7PP?: :^~!!~^: :?PP7
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:B@@B: !5B&@@@@&B5! :#@@B:
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:!!: ^G@@@&BPPB@@@@G^ :!!:
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:B@@@5^ ^5@@@B:
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:7J7: !@@@# :&@@@~ :?J7:
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J@@@5 :#@@@Y: :Y@@@B: 5@@@J
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!@@@&^ ~B@@@&G55G&@@@B~ ~&@@@~
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5@@@G: :7P#@@@@@@#P7: :B@@@Y
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:P@@@B~ :~!77!~: ~B@@@P
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Y@@@&Y^ ^5@@@@J
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!G@@@&P7^ ^7P&@@@G~
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!P&@@@&B? :: ?B&@@@&P!
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^75#&&Y :P&&5: 5&&B57^
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:^^ :P&&5: ^^:
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^^
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[nullpoint]
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EOF
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)
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TANG_SERVERS=(
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# "https://tang1.example.com your-thumbprint-1"
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# "https://tang2.example.com your-thumbprint-2"
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)
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TPM_ENABLED=true
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TPM_PCR_BANK="sha256"
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TPM_PCR_IDS="0,1,2,3,4,5,6,7,8"
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ALMA_USER="null"
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ENABLE_MOTD=true
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# REQUIRED: Set your SSH public key here - installation will fail without it!
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SSH_KEY="ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOkoTn2NreAXMriOUqzyj3YoFW6jMo9B5B+3R5k8yrMi dodox@dodox-ProArt"
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########################################################
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# Config End
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########################################################
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set -euo pipefail
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echo -e "\n$BANNER"
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echo -e "\n[+] Starting post-installation configuration..."
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# Check for SSH key
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if [ -z "${SSH_KEY:-}" ]; then
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echo "ERROR: No SSH key configured!"
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echo "You must set SSH_KEY variable at the top of this script."
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exit 1
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fi
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# Check for TPM
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echo "[+] Checking for TPM..."
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if [ ! -d "/sys/class/tpm/tpm0" ]; then
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echo "WARNING: No TPM detected!"
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TPM_ENABLED=false
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else
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echo "TPM detected."
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TPM_ENABLED=true
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fi
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# Install basic packages first
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echo "[+] Installing basic packages..."
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dnf install -y epel-release || exit 1
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dnf config-manager --set-enabled crb || exit 1
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dnf install -y zsh git wget curl || exit 1
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# Create user and add SSH key
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echo "[+] Creating user ${ALMA_USER}..."
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useradd -m -G wheel -s /bin/zsh ${ALMA_USER} || exit 1
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mkdir -p /home/${ALMA_USER}/.ssh
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echo "${SSH_KEY}" > /home/${ALMA_USER}/.ssh/authorized_keys
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chmod 700 /home/${ALMA_USER}/.ssh
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chmod 600 /home/${ALMA_USER}/.ssh/authorized_keys
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chown -R ${ALMA_USER}:${ALMA_USER} /home/${ALMA_USER}/.ssh
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# Install oh-my-zsh and powerlevel10k
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echo "[+] Installing oh-my-zsh and powerlevel10k..."
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# Download and run oh-my-zsh installer as the user with proper environment
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su - ${ALMA_USER} -c 'export RUNZSH=no CHSH=no KEEP_ZSHRC=yes && bash -c "$(wget -O- https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"' 2>/dev/null || echo "WARNING: oh-my-zsh installation failed"
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# Clone powerlevel10k theme
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su - ${ALMA_USER} -c 'git clone --depth=1 https://github.com/romkatv/powerlevel10k.git ~/.oh-my-zsh/custom/themes/powerlevel10k' 2>/dev/null || echo "WARNING: powerlevel10k installation failed"
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# Install dotfiles from git repo (cloning needed as we're in chroot)
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echo "[+] Installing dotfiles..."
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su - ${ALMA_USER} -c '
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cd &&
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git clone https://git.dominik-roth.eu/dodox/nullpoint.git /tmp/nullpoint-dotfiles &&
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cd /tmp/nullpoint-dotfiles/dotfiles &&
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for file in .*; do
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if [ -f "$file" ] && [ "$file" != "." ] && [ "$file" != ".." ]; then
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cp "$file" ~/ 2>/dev/null || true
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fi
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done &&
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cd && rm -rf /tmp/nullpoint-dotfiles
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' || echo "WARNING: dotfiles installation failed"
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# Set up MOTD
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if [ "$ENABLE_MOTD" = true ]; then
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echo "[+] Setting up MOTD..."
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cat > /etc/motd << MOTD
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$BANNER
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MOTD
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fi
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# Install additional packages
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echo "[+] Installing additional packages..."
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dnf install -y \
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clevis clevis-luks tpm2-tools tpm2-tss \
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tmux neovim python3-pip \
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tree gcc make autoconf automake tar bzip2 || exit 1
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# Install dropbear for early boot SSH
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echo "[+] Installing dropbear for early boot SSH..."
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dnf install -y dropbear dracut-network || exit 1
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# Install lsd and bat
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echo "[+] Installing lsd and bat..."
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# Install using fixed versions that should work
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LSD_VERSION="1.0.0"
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BAT_VERSION="0.24.0"
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# Download and install lsd
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if curl -sL "https://github.com/lsd-rs/lsd/releases/download/v${LSD_VERSION}/lsd-v${LSD_VERSION}-x86_64-unknown-linux-musl.tar.gz" | tar xz -C /tmp; then
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mv /tmp/lsd-*/lsd /usr/local/bin/ 2>/dev/null || true
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chmod +x /usr/local/bin/lsd 2>/dev/null || true
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fi
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# Download and install bat
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if curl -sL "https://github.com/sharkdp/bat/releases/download/v${BAT_VERSION}/bat-v${BAT_VERSION}-x86_64-unknown-linux-musl.tar.gz" | tar xz -C /tmp; then
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mv /tmp/bat-*/bat /usr/local/bin/ 2>/dev/null || true
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chmod +x /usr/local/bin/bat 2>/dev/null || true
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fi
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# Create batman script for fancy man pages
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cat > /usr/local/bin/batman << 'BATMAN'
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#!/bin/bash
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export MANPAGER="sh -c 'col -bx | bat -l man -p'"
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export MANROFFOPT="-c"
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man "$@"
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BATMAN
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chmod +x /usr/local/bin/batman
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# Create .tmp directory for user
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mkdir -p /home/${ALMA_USER}/.tmp
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chown ${ALMA_USER}:${ALMA_USER} /home/${ALMA_USER}/.tmp
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# Configure Clevis for automatic unlock
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if [ ${#TANG_SERVERS[@]} -gt 0 ] || [ "$TPM_ENABLED" = true ]; then
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echo "[+] Configuring Clevis for automatic unlock..."
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# Find LUKS devices
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LUKS_DEVICES=$(lsblk -o NAME,FSTYPE -nr | grep crypto_LUKS | cut -d' ' -f1)
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for device in $LUKS_DEVICES; do
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DEVICE_PATH="/dev/${device}"
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echo "Configuring Clevis for ${DEVICE_PATH}..."
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if [ "$TPM_ENABLED" = true ] && [ ${#TANG_SERVERS[@]} -eq 0 ]; then
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# TPM only
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clevis luks bind -d "$DEVICE_PATH" tpm2 "{\"pcr_bank\":\"$TPM_PCR_BANK\",\"pcr_ids\":\"$TPM_PCR_IDS\"}"
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elif [ "$TPM_ENABLED" = false ] && [ ${#TANG_SERVERS[@]} -gt 0 ]; then
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# Tang only
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for server in "${TANG_SERVERS[@]}"; do
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read -r url thumbprint <<< "$server"
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clevis luks bind -d "$DEVICE_PATH" tang "{\"url\":\"$url\",\"thp\":\"$thumbprint\"}"
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done
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elif [ "$TPM_ENABLED" = true ] && [ ${#TANG_SERVERS[@]} -gt 0 ]; then
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# Both TPM and Tang (require both)
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CONFIG="{\"t\":2,\"pins\":{"
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CONFIG+="\"tpm2\":{\"pcr_bank\":\"$TPM_PCR_BANK\",\"pcr_ids\":\"$TPM_PCR_IDS\"},"
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CONFIG+="\"tang\":{\"t\":1,\"tang\":["
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for server in "${TANG_SERVERS[@]}"; do
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read -r url thumbprint <<< "$server"
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CONFIG+="{\"url\":\"$url\",\"thp\":\"$thumbprint\"},"
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done
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CONFIG="${CONFIG%,}]}}}"
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clevis luks bind -d "$DEVICE_PATH" sss "$CONFIG"
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fi
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done
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fi
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# Enable Clevis for early boot (only needed for AlmaLinux < 8.7)
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echo "[+] Configuring Clevis for early boot..."
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OS_VERSION=$(cat /etc/redhat-release | grep -oE '[0-9]+\.[0-9]+' | head -1)
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if [[ "$(echo "$OS_VERSION < 8.7" | bc)" -eq 1 ]]; then
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echo " - Enabling clevis-luks-askpass.path for AlmaLinux $OS_VERSION"
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systemctl enable clevis-luks-askpass.path || true
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else
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echo " - AlmaLinux $OS_VERSION: clevis-luks-askpass.path not needed"
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fi
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# Configure dropbear for remote unlock
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echo "[+] Configuring dropbear SSH for remote unlock..."
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# Create custom dracut module for dropbear SSH
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mkdir -p /usr/lib/dracut/modules.d/60dropbear-ssh
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# Create the module setup script
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cat > /usr/lib/dracut/modules.d/60dropbear-ssh/module-setup.sh << 'EOF'
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#!/bin/bash
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check() {
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require_binaries dropbear dbclient dropbearkey dropbearconvert || return 1
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return 0
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}
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depends() {
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echo network
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}
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install() {
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inst_multiple dropbear dbclient dropbearkey dropbearconvert
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# Create directories
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inst_dir /etc/dropbear
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inst_dir /var/log
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inst_dir /root/.ssh
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# Copy authorized keys if they exist
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if [ -f /etc/dropbear/authorized_keys ]; then
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inst /etc/dropbear/authorized_keys /root/.ssh/authorized_keys
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fi
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# Install ED25519 host key only
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keyfile="/etc/dropbear/dropbear_ed25519_host_key"
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if [ ! -f "$keyfile" ]; then
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dropbearkey -t ed25519 -f "$keyfile" 2>/dev/null
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fi
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[ -f "$keyfile" ] && inst "$keyfile"
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# Install the service
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inst_simple "$moddir/dropbear.service" /etc/systemd/system/dropbear.service
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systemctl -q --root "$initdir" enable dropbear.service
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# Install unlock helper
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inst_simple "$moddir/unlock-luks.sh" /usr/bin/unlock-luks
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chmod 755 "$initdir/usr/bin/unlock-luks"
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}
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EOF
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# Create systemd service for dropbear
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cat > /usr/lib/dracut/modules.d/60dropbear-ssh/dropbear.service << 'EOF'
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[Unit]
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Description=Dropbear SSH Server
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After=network-online.target
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Wants=network-online.target
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[Service]
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Type=forking
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ExecStart=/usr/sbin/dropbear -R -E -p 22
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ExecReload=/bin/kill -HUP $MAINPID
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KillMode=process
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Restart=on-failure
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[Install]
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WantedBy=sysinit.target
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EOF
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# Create unlock helper script
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cat > /usr/lib/dracut/modules.d/60dropbear-ssh/unlock-luks.sh << 'EOF'
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#!/bin/bash
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echo "=== LUKS Remote Unlock Helper ==="
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echo ""
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echo "Checking for encrypted devices..."
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# Show block devices if available
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if command -v lsblk >/dev/null 2>&1; then
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echo "Block devices:"
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lsblk -o NAME,SIZE,TYPE,FSTYPE 2>/dev/null || echo " (lsblk not available)"
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else
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echo "Block devices: (listing /dev/sd* and /dev/md*)"
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ls -la /dev/sd* /dev/md* 2>/dev/null || echo " No standard devices found"
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fi
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echo ""
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echo "Encrypted devices status:"
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# Check for LUKS devices waiting to be unlocked
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for dev in /dev/mapper/luks-*; do
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if [ -e "$dev" ]; then
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echo " Found: $dev"
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fi
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done
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# Check systemd-ask-password files directly
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if [ -d /run/systemd/ask-password ]; then
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echo ""
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echo "Password prompts waiting:"
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ls -la /run/systemd/ask-password/ 2>/dev/null
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fi
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echo ""
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echo "Starting unlock process..."
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echo "Enter your LUKS passphrase when prompted:"
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echo ""
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# Run the password agent
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if command -v systemd-tty-ask-password-agent >/dev/null 2>&1; then
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systemd-tty-ask-password-agent
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else
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echo "ERROR: systemd-tty-ask-password-agent not found!"
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echo "Try running: /lib/systemd/systemd-tty-ask-password-agent"
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fi
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EOF
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chmod +x /usr/lib/dracut/modules.d/60dropbear-ssh/*.sh
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# Setup dropbear authorized keys
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mkdir -p /etc/dropbear
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echo "${SSH_KEY}" > /etc/dropbear/authorized_keys
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chmod 600 /etc/dropbear/authorized_keys
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# Generate ED25519 host key only (most secure)
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echo "[+] Generating ED25519 SSH host key..."
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# Use system SSH key if available, otherwise generate dropbear key
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openssh_key="/etc/ssh/ssh_host_ed25519_key"
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dropbear_key="/etc/dropbear/dropbear_ed25519_host_key"
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if [ -f "$openssh_key" ] && command -v dropbearconvert >/dev/null 2>&1; then
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echo " Converting existing OpenSSH ED25519 key to dropbear format..."
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dropbearconvert openssh dropbear "$openssh_key" "$dropbear_key" 2>/dev/null || {
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echo " Conversion failed, generating new dropbear key..."
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dropbearkey -t ed25519 -f "$dropbear_key" | grep -v "Generating" || true
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}
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elif [ ! -f "$dropbear_key" ]; then
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echo " Generating new ED25519 key..."
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dropbearkey -t ed25519 -f "$dropbear_key" | grep -v "Generating" || true
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# Also generate OpenSSH format to prevent key mismatch after boot
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if command -v ssh-keygen >/dev/null 2>&1; then
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echo " Generating matching OpenSSH key..."
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mkdir -p /etc/ssh
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# Extract public key and generate OpenSSH private key
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dropbearkey -y -f "$dropbear_key" | grep "^ssh-" > "${openssh_key}.pub"
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# Note: Direct conversion from dropbear to openssh private key requires dropbearconvert
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# For now, we'll have different keys but document the solution
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fi
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fi
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# Display SHA256 fingerprint
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if command -v ssh-keygen >/dev/null 2>&1; then
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fingerprint=$(dropbearkey -y -f "$dropbear_key" | ssh-keygen -lf - -E sha256 2>/dev/null | awk '{print $2}')
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if [ -n "$fingerprint" ]; then
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echo " SHA256 fingerprint: $fingerprint"
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echo " Note: This is the initramfs (rescue) SSH fingerprint."
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echo " The normal system SSH may have a different fingerprint."
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fi
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fi
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# Configure dracut
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cat > /etc/dracut.conf.d/60-dropbear-ssh.conf << 'EOF'
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# Enable network and dropbear SSH
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add_dracutmodules+=" network dropbear-ssh "
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# Network configuration
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kernel_cmdline="rd.neednet=1"
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EOF
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# Regenerate initramfs
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echo "[+] Regenerating initramfs..."
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dracut -f --regenerate-all
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# Enable required services
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echo "[+] Enabling services..."
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# systemctl enable stratisd # Not needed without Stratis
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systemctl enable sshd
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# Disable root login
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echo "[+] Securing SSH..."
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sed -i 's/^#PermitRootLogin.*/PermitRootLogin no/' /etc/ssh/sshd_config
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# Set SELinux to enforcing
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echo "[+] Setting SELinux to enforcing..."
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sed -i 's/^SELINUX=.*/SELINUX=enforcing/' /etc/selinux/config
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echo "✅ Post-installation complete!"
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echo ""
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echo "IMPORTANT: The LUKS passphrase is set in install.conf"
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echo "Save it securely for recovery purposes."
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echo ""
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echo "After reboot:"
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echo "- SSH to port 22 for remote unlock: ssh root@<server-ip>"
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echo "- Run 'unlock-luks' and follow the instructions to unlock LUKS"
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echo "- Once unlocked, SSH to port 22 as user '${ALMA_USER}'"
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echo "- LUKS passphrase: [see installer output]" |