136 lines
5.0 KiB
Bash
136 lines
5.0 KiB
Bash
#!/bin/bash
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-05-05; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.git
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# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
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# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-FileType: SOURCE
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# SPDX-License-Identifier: LicenseRef-CNCL-1.1 OR LicenseRef-CCLA-1.1
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# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
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# SPDX-PackageName: CISS.debian.live.builder
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# SPDX-Security-Contact: security@coresecret.eu
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guard_sourcing || return "${ERR_GUARD_SRCE}"
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#######################################
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# Cleanup wrapper on the traps on 'ERR' and 'EXIT'.
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# Globals:
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# GNUPGHOME
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# LOG_ERROR
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# VAR_CDLB_INSIDE_RUNNER
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# VAR_EARLY_DEBUG
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# VAR_HANDLER_BUILD_DIR
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# VAR_KERNEL_INF
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# VAR_KERNEL_SRT
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# VAR_KERNEL_TMP
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# VAR_NOTES
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# VAR_TMP_SECRET
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# VAR_WORKDIR
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# Arguments:
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# 1 : ${trap_on_exit_code} of trap_on_exit()
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# Returns:
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# 0: on success
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#######################################
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clean_up() {
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declare chroot_directory="" clean_exit_code="$1" fs_type="" includes_directory=""
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if [[ -e /dev/mapper/crypt_liveiso ]]; then
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cryptsetup close crypt_liveiso || true
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fi
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rm -f -- "${VAR_KERNEL_INF}"
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rm -f -- "${VAR_KERNEL_SRT}"
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rm -f -- "${VAR_KERNEL_TMP}"
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rm -f -- "${VAR_NOTES}"
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### Release advisory lock on FD 127.
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flock -u 127 2>/dev/null || true
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### Close file descriptor 127.
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exec 127>&- 2>/dev/null || true
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### Remove the lockfile artifact.
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rm -f /run/lock/ciss_live_builder.lock
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### Removes the error log on clean exit.
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if (( clean_exit_code == 0 )); then rm -f -- "${LOG_ERROR}"; fi
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### Cleaning TCP wrapper artifacts.
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if [[ -f "${VAR_WORKDIR}/hosts.allow" ]]; then
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rm -f "${VAR_WORKDIR}/hosts.allow"
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fi
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if [[ -f "${VAR_WORKDIR}/hosts.deny" ]]; then
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rm -f "${VAR_WORKDIR}/hosts.deny"
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fi
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### Kill gpg-agent and remove artifacts securely.
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if [[ "${VAR_CDLB_INSIDE_RUNNER}" != "true" ]]; then
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if [[ -n "${GNUPGHOME:-}" && -d "${GNUPGHOME}" ]]; then
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gpgconf --kill gpg-agent >/dev/null 2>&1 || true
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fs_type="$(stat -f -c %T "${GNUPGHOME}" 2>/dev/null || echo "GNUPGHOME: unknown fs.")"
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if [[ "${fs_type}" == "tmpfs" || "${fs_type}" == "ramfs" ]]; then
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rm -rf --one-file-system -- "${GNUPGHOME}" 2>/dev/null || true
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else
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chmod -R u+rwX "${GNUPGHOME}" >/dev/null 2>&1 || true
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find "${GNUPGHOME}" -type f -exec shred -fuz -n 2 -- {} + 2>/dev/null || true
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find "${GNUPGHOME}" \( -type s -o -type p -o -type l \) -delete 2>/dev/null || true
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rm -rf --one-file-system -- "${GNUPGHOME}" 2>/dev/null || true
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fi
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fi
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fi
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### No tracing for security reasons ------------------------------------------------------------------------------------------
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[[ "${VAR_EARLY_DEBUG}" == "true" ]] && set +x
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### Removes secrets securely only after re-validating the fixed tmpfs staging area.
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if validate_secret_staging_area "true"; then
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# shellcheck disable=SC2312
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find "${VAR_TMP_SECRET}" -xdev -type f -print0 | xargs -0 --no-run-if-empty shred -fzu -n 5 -- || true
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find "${VAR_TMP_SECRET}" -xdev -depth -type d -empty -delete || true
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else
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printf "\e[93m⚠ Secret cleanup skipped because the staging area failed validation. \e[0m\n" >&2
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fi
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### Destructive build cleanup requires the exact builder-owned directory marker.
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if [[ -n "${VAR_HANDLER_BUILD_DIR}" ]] && validate_build_directory_marker "${VAR_HANDLER_BUILD_DIR}" "true"; then
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if [[ -e "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot" || -L "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot" ]]; then
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if validate_build_directory_subpath "${VAR_HANDLER_BUILD_DIR}" "config/includes.chroot" includes_directory "true"; then
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# shellcheck disable=SC2312
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find "${includes_directory}" -xdev -type f -print0 | xargs -0 --no-run-if-empty shred -fzu -n 5 -- || true
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find "${includes_directory}" -depth -xdev -type d -empty -delete || true
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else
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printf "\e[93m⚠ Build includes cleanup skipped because the exact subpath failed validation. \e[0m\n" >&2
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fi
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fi
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if [[ -e "${VAR_HANDLER_BUILD_DIR}/chroot" || -L "${VAR_HANDLER_BUILD_DIR}/chroot" ]]; then
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if validate_build_directory_subpath "${VAR_HANDLER_BUILD_DIR}" "chroot" chroot_directory "true"; then
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remove_build_paths "${chroot_directory}" || true
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else
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printf "\e[93m⚠ Build chroot cleanup skipped because the exact subpath failed validation. \e[0m\n" >&2
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fi
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fi
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elif [[ -n "${VAR_HANDLER_BUILD_DIR}" ]]; then
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printf "\e[93m⚠ Build-directory cleanup skipped because the exact builder-owned marker failed validation. \e[0m\n" >&2
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fi
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### Turn on tracing again ----------------------------------------------------------------------------------------------------
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[[ "${VAR_EARLY_DEBUG}" == "true" ]] && set -x
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return 0
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}
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### Prevents accidental 'unset -f'.
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# shellcheck disable=SC2034
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readonly -f clean_up
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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