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260 lines
9.7 KiB
Bash
260 lines
9.7 KiB
Bash
#!/bin/sh
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# k3os-config.sh
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# A configuration utility for k3os environments (BusyBox/Alpine compatible)
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# --- Global Variables and Constants ---
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CONNMAN_CONFIG="/var/lib/connman/default.config"
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HOSTNAME_FILE="/var/lib/rancher/k3os/hostname"
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SSHD_CONFIG="/etc/ssh/sshd_config"
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# Get current user's home directory for Kubeconfig
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USER_HOME=$(getent passwd "$(whoami)" | cut -d: -f6)
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KUBECONFIG_PATH="$USER_HOME/.kube/config"
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# --- Utility Functions ---
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# Function to display system status indicators
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show_status() {
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printf "\n"
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printf "\033[44;1m--- K3OS Node Status ---\033[0m\n"
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# 1. Hostname
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CURRENT_HOSTNAME=$(hostname)
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# 2. SSHD Password Auth Status (Requires reading a root-owned file, so we use sudo or check existence)
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SSHD_STATUS="\033[31mError (Need Sudo)\033[0m"
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if [ -f "$SSHD_CONFIG" ] && grep -q '^PasswordAuthentication yes' "$SSHD_CONFIG" 2>/dev/null; then
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SSHD_STATUS="\033[32mEnabled\033[0m"
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elif [ -f "$SSHD_CONFIG" ]; then
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SSHD_STATUS="\033[33mDisabled\033[0m"
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fi
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# 3. Static IP Configuration Check (from Connman config)
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STATIC_IP=""
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CONFIG_IFACE=""
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# Use 'sudo cat' to read the root-owned config file
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if sudo test -f "$CONNMAN_CONFIG"; then
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CONNMAN_CONTENT=$(sudo cat "$CONNMAN_CONFIG" 2>/dev/null)
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CONFIG_IFACE=$(echo "$CONNMAN_CONTENT" | grep '^\[service_' | head -n 1 | sed -e 's/^\[service_\(.*\)\].*$/\1/' | tr -d '[]')
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STATIC_IP=$(echo "$CONNMAN_CONTENT" | grep -oE 'IPv4 = ([0-9]{1,3}\.){3}[0-9]{1,3}' 2>/dev/null | head -n 1 | awk '{print $3}' | cut -d'/' -f1)
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fi
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# 4. Current/Active IP and DHCP status - Use the default route interface
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ACTIVE_IFACE=$(ip route get 1.1.1.1 | grep -o 'dev [^ ]*' | awk '{print $2}' | head -n 1)
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if [ -z "$ACTIVE_IFACE" ]; then
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ACTIVE_IFACE="eth0"
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fi
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CURRENT_IP=$(ip addr show "$ACTIVE_IFACE" 2>/dev/null | grep 'inet ' | awk '{print $2}' | cut -d/ -f1 | head -n 1)
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DHCP_STATUS="\033[31mN/A\033[0m"
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IP_ADDRESS_STATUS="\033[31mNo Active Link\033[0m"
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if [ -n "$CURRENT_IP" ]; then
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IP_ADDRESS_STATUS="$CURRENT_IP (\033[36m$ACTIVE_IFACE\033[0m)"
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if [ -n "$STATIC_IP" ] && [ "$STATIC_IP" = "$CURRENT_IP" ]; then
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DHCP_STATUS="\033[33mNo\033[0m (\033[36mStatic Configured\033[0m: $CONFIG_IFACE)"
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else
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DHCP_STATUS="\033[32mYes\033[0m (or Link-Local)"
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fi
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elif [ -n "$STATIC_IP" ]; then
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IP_ADDRESS_STATUS="\033[33mStatic Configured\033[0m: $STATIC_IP (Inactive)"
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DHCP_STATUS="\033[33mNo\033[0m (Check Link)"
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fi
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# Display results using printf for aligned columns
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printf "\033[1m%-30s\033[0m: %s\n" "Hostname" "$CURRENT_HOSTNAME"
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printf "\033[1m%-30s\033[0m: %s\n" "Active IP Address (Interface)" "$IP_ADDRESS_STATUS"
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printf "\033[1m%-30s\033[0m: %s\n" "DHCP Assigned" "$DHCP_STATUS"
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printf "\033[1m%-30s\033[0m: %s\n" "SSHD Password Authentication" "$SSHD_STATUS"
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printf "\n"
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}
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# Function to notify user about reboot
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notify_reboot() {
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printf "\n\033[33;1m*** Configuration Applied ***\033[0m\n"
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printf "For the new settings (Hostname, IP) to take full effect, you must reboot.\n"
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printf "\033[36m(Note: SSH changes are active, but a reboot is safer).\033[0m\n"
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}
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# Helper to run a command that modifies a root-owned file
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run_privileged() {
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printf "\n\033[34;1m[ACTION REQUIRING SUDO]\033[0m\n"
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# Use sudo sh -c to execute the command as root
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if sudo sh -c "$1"; then
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return 0
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else
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printf "\n\033[31mError: Sudo command failed. Check password or permissions.\033[0m\n"
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return 1
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fi
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}
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# --- Menu Option Functions (1, 2, 3 require sudo via run_privileged) ---
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# a. Update hostname
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update_hostname() {
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printf "\n--- Update Hostname ---\n"
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printf "The current hostname is: \033[36m%s\033[0m\n" "$(hostname)"
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printf "Enter new hostname: "
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read NEW_HOSTNAME
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if [ -z "$NEW_HOSTNAME" ]; then
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printf "\033[31mHostname cannot be empty. Aborting.\033[0m\n"
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return
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fi
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# Use run_privileged for writing to the root-owned file
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if run_privileged "echo '$NEW_HOSTNAME' > $HOSTNAME_FILE"; then
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# This updates the *runtime* hostname, not just the file
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hostname "$NEW_HOSTNAME"
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printf "\n\033[32mSuccessfully updated hostname to: %s\033[0m\n" "$NEW_HOSTNAME"
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notify_reboot
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fi
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}
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# b. Configure IP address (Static)
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configure_ip() {
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printf "\n--- Configure Static IP Address (Connman) ---\n"
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# 1. Detect Interface
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IFACE=$(ip route get 1.1.1.1 2>/dev/null | grep -o 'dev [^ ]*' | awk '{print $2}' | head -n 1)
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if [ -z "$IFACE" ]; then
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printf "\033[31mCould not detect a default network interface. Aborting.\033[0m\n"
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return
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fi
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printf "Detected primary network interface: \033[36m%s\033[0m\n" "$IFACE"
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printf "Enter static IP address (e.g., 192.168.1.10): "
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read IP_ADDR
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printf "Enter netmask prefix (e.g., 24 for 255.255.255.0): "
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read MASK_PREFIX
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printf "Enter gateway address (e.g., 192.168.1.1): "
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read GATEWAY
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printf "Enter nameserver IP (e.g., 8.8.8.8): "
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read NAMESERVER
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if [ -z "$IP_ADDR" ] || [ -z "$MASK_PREFIX" ] || [ -z "$GATEWAY" ] || [ -z "$NAMESERVER" ]; then
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printf "\033[31mAll fields are required. Aborting.\033[0m\n"
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return
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fi
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# Generate Connman config content in a shell variable
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CONFIG_CONTENT="# Automatically generated by k3os-config.sh\n"
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CONFIG_CONTENT="${CONFIG_CONTENT}[service_$IFACE]\n"
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CONFIG_CONTENT="${CONFIG_CONTENT}Type = ethernet\n"
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CONFIG_CONTENT="${CONFIG_CONTENT}Nameservers = $NAMESERVER\n"
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CONFIG_CONTENT="${CONFIG_CONTENT}IPv4 = $IP_ADDR/$MASK_PREFIX/$GATEWAY\n"
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# Use run_privileged to write the configuration content
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printf "Writing static configuration to %s...\n" "$CONNMAN_CONFIG"
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# We must escape the content slightly to pass it through 'sh -c'
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# Use tee to safely overwrite the file as root.
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PRIV_CMD="printf \"%b\" \"$CONFIG_CONTENT\" | tee $CONNMAN_CONFIG >/dev/null"
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if run_privileged "$PRIV_CMD"; then
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printf "\n\033[32mStatic IP configuration saved for interface %s.\033[0m\n" "$IFACE"
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printf "IP: %s/%s, Gateway: %s, Nameserver: %s\n" "$IP_ADDR" "$MASK_PREFIX" "$GATEWAY" "$NAMESERVER"
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notify_reboot
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fi
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}
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# c. Toggle sshd password authentication
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toggle_ssh_auth() {
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printf "\n--- Toggle SSHD Password Authentication ---\n"
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# Check current status by reading the root-owned file
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if sudo grep -q '^PasswordAuthentication yes' "$SSHD_CONFIG" 2>/dev/null; then
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CURRENT_SETTING="yes"
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NEW_SETTING="no"
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else
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CURRENT_SETTING="no"
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NEW_SETTING="yes"
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fi
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printf "Current setting: \033[36m%s\033[0m\n" "$CURRENT_SETTING"
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# The sed command needs to run as root
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# 1. Check if line exists (commented or not) and replace it
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# 2. If it doesn't exist, append it
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# We use a combined, double-quoted command for run_privileged
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PRIV_CMD="if grep -q '^#*PasswordAuthentication' $SSHD_CONFIG; then
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sed -i 's/^#*PasswordAuthentication .*/PasswordAuthentication $NEW_SETTING/g' $SSHD_CONFIG
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else
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echo 'PasswordAuthentication $NEW_SETTING' >> $SSHD_CONFIG
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fi"
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if run_privileged "$PRIV_CMD"; then
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printf "Setting changed to: \033[32m%s\033[0m\n" "$NEW_SETTING"
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printf "Restarting SSH service...\n"
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# Restarting the service also requires sudo
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if run_privileged "/etc/init.d/sshd restart"; then
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printf "\n\033[32mSSHD service restarted. Password authentication is now set to %s.\033[0m\n" "$NEW_SETTING"
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fi
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fi
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}
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# d. Download kubeconfig from master (NO SUDO REQUIRED)
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download_kubeconfig() {
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printf "\n--- Download Kubeconfig ---\n"
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printf "Enter k3s master IP address: "
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read MASTER_IP
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if [ -z "$MASTER_IP" ]; then
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printf "\033[31mMaster IP cannot be empty. Aborting.\033[0m\n"
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return
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fi
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printf "Attempting to download /etc/rancher/k3s/k3s.yaml from rancher@%s\n" "$MASTER_IP"
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printf "(You will be prompted for the 'rancher' user's password on the remote master.)\n"
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# Create .kube directory in the current user's home directory
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mkdir -p "$USER_HOME/.kube"
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# Use scp to copy the file to the user's local path
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if scp "rancher@$MASTER_IP:/etc/rancher/k3s/k3s.yaml" "$KUBECONFIG_PATH"; then
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printf "\n\033[32mSuccessfully downloaded kubeconfig to %s\033[0m\n" "$KUBECONFIG_PATH"
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printf "The config file is ready for use by 'kubectl' or 'k3s kubectl'.\n"
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else
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printf "\n\033[31mError: Kubeconfig download failed.\033[0m\n"
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printf "Check the master IP, password for 'rancher', and SSH connectivity.\n"
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fi
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}
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# --- Main Menu Logic ---
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main_menu() {
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while true; do
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show_status
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printf "\033[1mSelect an option (1, 2, 3 require sudo):\033[0m\n"
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printf " \033[36m1\033[0m) Update hostname (k3os reboot required)\n"
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printf " \033[36m2\033[0m) Configure static IP (k3os reboot required)\n"
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printf " \033[36m3\033[0m) Toggle sshd PasswordAuthentication (SSHD service restart)\n"
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printf " \033[36m4\033[0m) Download kubeconfig from master (Runs as user, NO local sudo)\n"
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printf " \033[31mQ\033[0m) Quit\n"
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printf "\nOption: "
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read CHOICE
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case "$CHOICE" in
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1) update_hostname ;;
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2) configure_ip ;;
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3) toggle_ssh_auth ;;
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4) download_kubeconfig ;;
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[Qq]*) printf "\nExiting K3OS configuration utility. Goodbye.\n"; exit 0 ;;
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*) printf "\n\033[31mInvalid option. Please choose 1, 2, 3, 4, or Q.\033[0m\n" ;;
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esac
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printf "\nPress ENTER to return to the menu...\n"
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read DUMMY
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done
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}
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# --- Script Execution ---
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main_menu
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