CISS.debian.live.builder/lib/lib_primordial.sh

#!/bin/bash
# SPDX-Version: 3.0
# SPDX-CreationInfo: 2025-11-06; WEIDNER, Marc S.; <msw@coresecret.dev>
# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.git
# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
# SPDX-FileType: SOURCE
# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
# SPDX-PackageName: CISS.debian.live.builder
# SPDX-Security-Contact: security@coresecret.eu

guard_sourcing || return "${ERR_GUARD_SRCE}"

#######################################
# Integrate primordial SSH identity files.
# Globals:
#   BASH_SOURCE
#   VAR_AGE
#   VAR_AGE_KEY
#   VAR_HANDLER_BUILD_DIR
#   VAR_SSHFP
#   VAR_TMP_SECRET
# Arguments:
#   None
# Returns:
#   0: on success
#######################################
init_primordial() {
  printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 %s starting ... \e[0m\n" "${BASH_SOURCE[0]}"

  declare     var_dropbear_version="2025.88"

  install -d -m 0700 "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/build"
  install -d -m 0700 "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/dropbear"
  install    -m 0400 "${VAR_WORKDIR}/upgrades/dropbear/dropbear-${var_dropbear_version}.tar.bz2" \
    "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/dropbear/dropbear-${var_dropbear_version}.tar.bz2"
  install    -m 0400 "${VAR_WORKDIR}/upgrades/dropbear/localoptions.h" \
    "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/dropbear/localoptions.h"



  ### Check for SOPS AGE key integration ---------------------------------------------------------------------------------------
  if [[ "${VAR_AGE,,}" == "true" ]]; then

    install -d -m 0700                                 "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.config/sops/age"
    install -m 0400 "${VAR_TMP_SECRET}/${VAR_AGE_KEY}" "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.config/sops/age/keys.txt"
    shred -fzu -n 5 -- "${VAR_TMP_SECRET}/${VAR_AGE_KEY}" 2>/dev/null || rm -f "${VAR_TMP_SECRET}/${VAR_AGE_KEY}"

  fi

  ### Check for SSH CISS and PhysNet primordial-workflow(tm) integration -------------------------------------------------------
  if [[ "${VAR_SSHFP,,}" == "true" ]]; then

    install -d -m 0700                      "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.ssh"
    install -m 0600 "${VAR_TMP_SECRET}/id"* "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.ssh/"
    normalize_ssh_keys_in_dir               "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.ssh"
    shred -fzu -n 5 -- "${VAR_TMP_SECRET}/id"* 2>/dev/null || rm -f "${VAR_TMP_SECRET}/id"*

    install -d -m 0700                             "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/ssh"
    install -m 0600 "${VAR_TMP_SECRET}/ssh_host_"* "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/ssh/"
    normalize_ssh_keys_in_dir                      "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/ssh/"
    shred -fzu -n 5 -- "${VAR_TMP_SECRET}/ssh_host_"* 2>/dev/null || rm -f "${VAR_TMP_SECRET}/ssh_host_"*

  fi

  printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ %s successfully applied. \e[0m\n" "${BASH_SOURCE[0]}"

  return 0
}
### Prevents accidental 'unset -f'.
# shellcheck disable=SC2034
readonly -f init_primordial

#######################################
# Normalize SSH key files: strip CRLF.
# Globals:
#   None
# Arguments:
#   1: ssh_host_key or id file
# Returns:
#   0: on success
#   1: on failure
#######################################
normalize_ssh_key_file() {
  declare var_key_file="" var_tmp_file=""
  var_key_file="$1"

  [[ -f "${var_key_file}" ]] || return 0

  ### If there is any CR (carriage return), strip it.
  if grep -q $'\r' "${var_key_file}"; then

    ### Use a temporary file to avoid in-place corruption-
    var_tmp_file="${var_key_file}.noCR.$$"

    ### Remove only '\r', keep everything else as-is.
    tr -d '\r' < "${var_key_file}" > "${var_tmp_file}" || {
      echo "ERROR: Failed to normalize CRLF in ${var_key_file}" >&2
      rm -f "${var_tmp_file}"
      return 1
    }

    mv "${var_tmp_file}" "${var_key_file}" || {
      echo "ERROR: Failed to replace normalized file ${var_key_file}" >&2
      rm -f "${var_tmp_file}"
      return 1
    }
  fi

  return 0
}
### Prevents accidental 'unset -f'.
# shellcheck disable=SC2034
readonly -f normalize_ssh_key_file

#######################################
# Normalize SSH key files in dir.
# Globals:
#   None
# Arguments:
#   1: directory
# Returns:
#   0: on success
#   1: on failure
#######################################
normalize_ssh_keys_in_dir() {
  declare var_key_dir="" var_key_file=""
  var_key_dir="$1"

  [[ -d "${var_key_dir}" ]] || return 0

  ### Cover both root identity keys and host keys.
  for var_key_file in "${var_key_dir}"/id_* "${var_key_dir}"/ssh_host_*; do

    [[ -e "${var_key_file}" ]] || continue

    normalize_ssh_key_file "${var_key_file}" || return 1

  done

  return 0
}
### Prevents accidental 'unset -f'.
# shellcheck disable=SC2034
readonly -f normalize_ssh_keys_in_dir
# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh