mirror of
https://github.com/elitak/nixos-infect.git
synced 2024-11-01 08:39:55 +03:00
bbe94a1175
* add support for SK authorized keys nixos-infect incorrectly handles * Update nixos-infect * Replace space with [[:space:]] * Fix possible security issue
409 lines
12 KiB
Bash
409 lines
12 KiB
Bash
#! /usr/bin/env bash
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# More info at: https://github.com/elitak/nixos-infect
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set -e -o pipefail
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autodetectProvider() {
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if [ -e /etc/hetzner-build ]; then
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PROVIDER="hetznercloud"
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fi
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}
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makeConf() {
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# Skip everything if main config already present
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[[ -e /etc/nixos/configuration.nix ]] && return 0
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# Lightsail config is not like the others
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if [ "$PROVIDER" = "lightsail" ]; then
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makeLightsailConf
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return 0
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fi
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# NB <<"EOF" quotes / $ ` in heredocs, <<EOF does not
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mkdir -p /etc/nixos
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# Prevent grep for sending error code 1 (and halting execution) when no lines are selected : https://www.unix.com/man-page/posix/1P/grep
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local IFS=$'\n'
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for trypath in /root/.ssh/authorized_keys /home/$SUDO_USER/.ssh/authorized_keys $HOME/.ssh/authorized_keys; do
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[[ -r "$trypath" ]] \
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&& keys=$(sed -E 's/^[^#].*[[:space:]]((sk-ssh|sk-ecdsa|ssh|ecdsa)-[^[:space:]]+)[[:space:]]+([^[:space:]]+)([[:space:]]*.*)$/\1 \3\4/' "$trypath") \
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&& [[ ! -z "$keys" ]] \
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&& break
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done
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local network_import=""
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[[ -n "$doNetConf" ]] && network_import="./networking.nix # generated at runtime by nixos-infect"
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cat > /etc/nixos/configuration.nix << EOF
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{ ... }: {
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imports = [
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./hardware-configuration.nix
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$network_import
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$NIXOS_IMPORT
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];
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boot.tmp.cleanOnBoot = true;
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zramSwap.enable = ${zramswap};
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networking.hostName = "$(hostname -s)";
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networking.domain = "$(hostname -d)";
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services.openssh.enable = true;
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users.users.root.openssh.authorizedKeys.keys = [$(while read -r line; do
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line=$(echo -n "$line" | sed 's/\r//g')
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trimmed_line=$(echo -n "$line" | xargs)
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echo -n "''$trimmed_line'' "
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done <<< "$keys")];
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system.stateVersion = "23.11";
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}
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EOF
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if isEFI; then
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bootcfg=$(cat << EOF
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boot.loader.grub = {
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efiSupport = true;
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efiInstallAsRemovable = true;
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device = "nodev";
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};
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fileSystems."/boot" = { device = "$esp"; fsType = "vfat"; };
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EOF
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)
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else
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bootcfg=$(cat << EOF
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boot.loader.grub.device = "$grubdev";
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EOF
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)
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fi
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availableKernelModules=('"ata_piix"' '"uhci_hcd"' '"xen_blkfront"')
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if isX86_64; then
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availableKernelModules+=('"vmw_pvscsi"')
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fi
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# If you rerun this later, be sure to prune the filesSystems attr
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cat > /etc/nixos/hardware-configuration.nix << EOF
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{ modulesPath, ... }:
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{
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imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
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$bootcfg
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boot.initrd.availableKernelModules = [ ${availableKernelModules[@]} ];
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boot.initrd.kernelModules = [ "nvme" ];
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fileSystems."/" = { device = "$rootfsdev"; fsType = "$rootfstype"; };
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$swapcfg
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}
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EOF
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[[ -n "$doNetConf" ]] && makeNetworkingConf || true
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}
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makeLightsailConf() {
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mkdir -p /etc/nixos
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cat > /etc/nixos/configuration.nix << EOF
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{ config, pkgs, modulesPath, lib, ... }:
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{
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imports = [ "\${modulesPath}/virtualisation/amazon-image.nix" ];
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boot.loader.grub.device = lib.mkForce "/dev/nvme0n1";
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}
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EOF
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}
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makeNetworkingConf() {
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# XXX It'd be better if we used procfs for all this...
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local IFS=$'\n'
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eth0_name=$(ip address show | grep '^2:' | awk -F': ' '{print $2}')
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eth0_ip4s=$(ip address show dev "$eth0_name" | grep 'inet ' | sed -r 's|.*inet ([0-9.]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|')
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eth0_ip6s=$(ip address show dev "$eth0_name" | grep 'inet6 ' | sed -r 's|.*inet6 ([0-9a-f:]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|' || '')
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gateway=$(ip route show dev "$eth0_name" | grep default | sed -r 's|default via ([0-9.]+).*|\1|')
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gateway6=$(ip -6 route show dev "$eth0_name" | grep default | sed -r 's|default via ([0-9a-f:]+).*|\1|' || true)
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ether0=$(ip address show dev "$eth0_name" | grep link/ether | sed -r 's|.*link/ether ([0-9a-f:]+) .*|\1|')
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eth1_name=$(ip address show | grep '^3:' | awk -F': ' '{print $2}')||true
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if [ -n "$eth1_name" ];then
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eth1_ip4s=$(ip address show dev "$eth1_name" | grep 'inet ' | sed -r 's|.*inet ([0-9.]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|')
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eth1_ip6s=$(ip address show dev "$eth1_name" | grep 'inet6 ' | sed -r 's|.*inet6 ([0-9a-f:]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|' || '')
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ether1=$(ip address show dev "$eth1_name" | grep link/ether | sed -r 's|.*link/ether ([0-9a-f:]+) .*|\1|')
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interfaces1=$(cat << EOF
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$eth1_name = {
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ipv4.addresses = [$(for a in "${eth1_ip4s[@]}"; do echo -n "
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$a"; done)
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];
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ipv6.addresses = [$(for a in "${eth1_ip6s[@]}"; do echo -n "
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$a"; done)
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];
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};
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EOF
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)
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extraRules1="ATTR{address}==\"${ether1}\", NAME=\"${eth1_name}\""
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else
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interfaces1=""
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extraRules1=""
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fi
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readarray nameservers < <(grep ^nameserver /etc/resolv.conf | sed -r \
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-e 's/^nameserver[[:space:]]+([0-9.a-fA-F:]+).*/"\1"/' \
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-e 's/127[0-9.]+/8.8.8.8/' \
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-e 's/::1/8.8.8.8/' )
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if [[ "$eth0_name" = eth* ]]; then
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predictable_inames="usePredictableInterfaceNames = lib.mkForce false;"
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else
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predictable_inames="usePredictableInterfaceNames = lib.mkForce true;"
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fi
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cat > /etc/nixos/networking.nix << EOF
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{ lib, ... }: {
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# This file was populated at runtime with the networking
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# details gathered from the active system.
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networking = {
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nameservers = [ ${nameservers[@]} ];
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defaultGateway = "${gateway}";
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defaultGateway6 = {
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address = "${gateway6}";
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interface = "${eth0_name}";
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};
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dhcpcd.enable = false;
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$predictable_inames
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interfaces = {
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$eth0_name = {
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ipv4.addresses = [$(for a in "${eth0_ip4s[@]}"; do echo -n "
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$a"; done)
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];
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ipv6.addresses = [$(for a in "${eth0_ip6s[@]}"; do echo -n "
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$a"; done)
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];
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ipv4.routes = [ { address = "${gateway}"; prefixLength = 32; } ];
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ipv6.routes = [ { address = "${gateway6}"; prefixLength = 128; } ];
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};
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$interfaces1
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};
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};
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services.udev.extraRules = ''
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ATTR{address}=="${ether0}", NAME="${eth0_name}"
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$extraRules1
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'';
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}
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EOF
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}
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checkExistingSwap() {
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SWAPSHOW=$(swapon --show --noheadings --raw)
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zramswap=true
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swapcfg=""
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if [[ -n "$SWAPSHOW" ]]; then
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SWAP_DEVICE="${SWAPSHOW%% *}"
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if [[ "$SWAP_DEVICE" == "/dev/"* ]]; then
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zramswap=false
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swapcfg="swapDevices = [ { device = \"${SWAP_DEVICE}\"; } ];"
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NO_SWAP=true
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fi
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fi
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}
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makeSwap() {
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swapFile=$(mktemp /tmp/nixos-infect.XXXXX.swp)
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dd if=/dev/zero "of=$swapFile" bs=1M count=$((1*1024))
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chmod 0600 "$swapFile"
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mkswap "$swapFile"
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swapon -v "$swapFile"
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}
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removeSwap() {
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swapoff -a
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rm -vf /tmp/nixos-infect.*.swp
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}
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isX86_64() {
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[[ "$(uname -m)" == "x86_64" ]]
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}
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isEFI() {
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[ -d /sys/firmware/efi ]
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}
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findESP() {
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esp=""
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for d in /boot/EFI /boot/efi /boot; do
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[[ ! -d "$d" ]] && continue
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[[ "$d" == "$(df "$d" --output=target | sed 1d)" ]] \
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&& esp="$(df "$d" --output=source | sed 1d)" \
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&& break
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done
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[[ -z "$esp" ]] && { echo "ERROR: No ESP mount point found"; return 1; }
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for uuid in /dev/disk/by-uuid/*; do
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[[ $(readlink -f "$uuid") == "$esp" ]] && echo $uuid && return 0
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done
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}
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prepareEnv() {
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# $esp and $grubdev are used in makeConf()
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if isEFI; then
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esp="$(findESP)"
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else
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for grubdev in /dev/vda /dev/sda /dev/xvda /dev/nvme0n1 ; do [[ -e $grubdev ]] && break; done
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fi
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# Retrieve root fs block device
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# (get root mount) (get partition or logical volume)
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rootfsdev=$(mount | grep "on / type" | awk '{print $1;}')
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rootfstype=$(df $rootfsdev --output=fstype | sed 1d)
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# DigitalOcean doesn't seem to set USER while running user data
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export USER="root"
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export HOME="/root"
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# Nix installer tries to use sudo regardless of whether we're already uid 0
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#which sudo || { sudo() { eval "$@"; }; export -f sudo; }
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# shellcheck disable=SC2174
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mkdir -p -m 0755 /nix
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}
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fakeCurlUsingWget() {
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# Use adapted wget if curl is missing
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which wget && { \
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curl() {
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eval "wget $(
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(local isStdout=1
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for arg in "$@"; do
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case "$arg" in
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"-o")
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echo "-O";
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isStdout=0
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;;
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"-O")
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isStdout=0
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;;
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"-L")
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;;
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*)
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echo "$arg"
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;;
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esac
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done;
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[[ $isStdout -eq 1 ]] && echo "-O-"
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)| tr '\n' ' '
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)"
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}; export -f curl; }
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}
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req() {
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type "$1" > /dev/null 2>&1 || which "$1" > /dev/null 2>&1
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}
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checkEnv() {
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[[ "$(whoami)" == "root" ]] || { echo "ERROR: Must run as root"; return 1; }
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# Perform some easy fixups before checking
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# TODO prevent multiple calls to apt-get update
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(which dnf && dnf install -y perl-Digest-SHA) || true # Fedora 24
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which bzcat || (which yum && yum install -y bzip2) \
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|| (which apt-get && apt-get update && apt-get install -y bzip2) \
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|| true
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which xzcat || (which yum && yum install -y xz-utils) \
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|| (which apt-get && apt-get update && apt-get install -y xz-utils) \
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|| true
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which curl || fakeCurlUsingWget \
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|| (which apt-get && apt-get update && apt-get install -y curl) \
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|| true
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req curl || req wget || { echo "ERROR: Missing both curl and wget"; return 1; }
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req bzcat || { echo "ERROR: Missing bzcat"; return 1; }
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req xzcat || { echo "ERROR: Missing xzcat"; return 1; }
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req groupadd || { echo "ERROR: Missing groupadd"; return 1; }
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req useradd || { echo "ERROR: Missing useradd"; return 1; }
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req ip || { echo "ERROR: Missing ip"; return 1; }
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req awk || { echo "ERROR: Missing awk"; return 1; }
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req cut || req df || { echo "ERROR: Missing coreutils (cut, df)"; return 1; }
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# On some versions of Oracle Linux these have the wrong permissions,
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# which stops sshd from starting when NixOS boots
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chmod 600 /etc/ssh/ssh_host_*_key
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}
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infect() {
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# Add nix build users
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# FIXME run only if necessary, rather than defaulting true
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groupadd nixbld -g 30000 || true
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for i in {1..10}; do
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useradd -c "Nix build user $i" -d /var/empty -g nixbld -G nixbld -M -N -r -s "$(which nologin)" "nixbld$i" || true
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done
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# TODO use addgroup and adduser as fallbacks
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#addgroup nixbld -g 30000 || true
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#for i in {1..10}; do adduser -DH -G nixbld nixbld$i || true; done
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curl -L https://nixos.org/nix/install | sh -s -- --no-channel-add
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# shellcheck disable=SC1090
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source ~/.nix-profile/etc/profile.d/nix.sh
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[[ -z "$NIX_CHANNEL" ]] && NIX_CHANNEL="nixos-23.05"
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nix-channel --remove nixpkgs
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nix-channel --add "https://nixos.org/channels/$NIX_CHANNEL" nixos
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nix-channel --update
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if [[ $NIXOS_CONFIG = http* ]]
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then
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curl $NIXOS_CONFIG -o /etc/nixos/configuration.nix
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unset NIXOS_CONFIG
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fi
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export NIXOS_CONFIG="${NIXOS_CONFIG:-/etc/nixos/configuration.nix}"
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nix-env --set \
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-I nixpkgs=$HOME/.nix-defexpr/channels/nixos \
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-f '<nixpkgs/nixos>' \
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-p /nix/var/nix/profiles/system \
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-A system
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# Remove nix installed with curl | bash
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rm -fv /nix/var/nix/profiles/default*
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/nix/var/nix/profiles/system/sw/bin/nix-collect-garbage
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# Reify resolv.conf
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[[ -L /etc/resolv.conf ]] && mv -v /etc/resolv.conf /etc/resolv.conf.lnk && cat /etc/resolv.conf.lnk > /etc/resolv.conf
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# Set label of root partition
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if [ -n "$newrootfslabel" ]; then
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echo "Setting label of $rootfsdev to $newrootfslabel"
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e2label "$rootfsdev" "$newrootfslabel"
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fi
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# Stage the Nix coup d'état
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touch /etc/NIXOS
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echo etc/nixos >> /etc/NIXOS_LUSTRATE
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echo etc/resolv.conf >> /etc/NIXOS_LUSTRATE
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echo root/.nix-defexpr/channels >> /etc/NIXOS_LUSTRATE
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(cd / && ls etc/ssh/ssh_host_*_key* || true) >> /etc/NIXOS_LUSTRATE
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rm -rf /boot.bak
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isEFI && umount "$esp"
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mv -v /boot /boot.bak || { cp -a /boot /boot.bak ; rm -rf /boot/* ; umount /boot ; }
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if isEFI; then
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mkdir -p /boot
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mount "$esp" /boot
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find /boot -depth ! -path /boot -exec rm -rf {} +
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fi
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/nix/var/nix/profiles/system/bin/switch-to-configuration boot
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}
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if [ ! -v PROVIDER ]; then
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autodetectProvider
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fi
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[ "$PROVIDER" = "digitalocean" ] && doNetConf=y # digitalocean requires detailed network config to be generated
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[ "$PROVIDER" = "lightsail" ] && newrootfslabel="nixos"
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if [[ "$PROVIDER" = "digitalocean" ]] || [[ "$PROVIDER" = "servarica" ]] || [[ "$PROVIDER" = "hetznercloud" ]]; then
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doNetConf=y # some providers require detailed network config to be generated
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fi
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checkEnv
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prepareEnv
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checkExistingSwap
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if [[ -z "$NO_SWAP" ]]; then
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makeSwap # smallest (512MB) droplet needs extra memory!
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fi
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makeConf
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infect
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if [[ -z "$NO_SWAP" ]]; then
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removeSwap
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fi
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if [[ -z "$NO_REBOOT" ]]; then
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reboot
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fi
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