Marc S. Weidner
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
159 lines
5.2 KiB
Bash
159 lines
5.2 KiB
Bash
#!/bin/sh
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# bashsupport disable=BP5007
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# shellcheck disable=SC2249
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# shellcheck shell=sh
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-11-12; 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: EUPL-1.2 OR LicenseRef-CCLA-1.0
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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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# Purpose: Open /live/ciss_rootfs.crypt (LUKS) and present its SquashFS as /run/live/rootfs
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# Phase : premount (executed by live-boot inside the initramfs)
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set -eu
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printf "\e[95m[INFO] Starting: [/usr/lib/live/boot/0024-ciss-crypt-squash] ... \n\e[0m"
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#######################################
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# Premount logging helper.
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# Globals:
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# None
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# Arguments:
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# *: String to log.
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#######################################
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log() {
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msg="$*"
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if [ -w /dev/kmsg ]; then
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printf '<6>%s: %s\n' '0024-ciss-crypt-squash' "${msg}" > /dev/kmsg
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else
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printf '%s: %s\n' '0024-ciss-crypt-squash' "${msg}"
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fi
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}
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### Declare variables ----------------------------------------------------------------------------------------------------------
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CDLB_LUKS_FS="/live/ciss_rootfs.crypt"
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CDLB_ISO_LABEL="CISS.debian.live"
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MNT_MEDIUM="/run/live/medium"
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MNT_ROOTFS="/run/live/rootfs"
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_PARAMETER=""
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_dev=""
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### Read the kernel cmdline once -----------------------------------------------------------------------------------------------
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CMDLINE="$(cat /proc/cmdline 2>/dev/null || printf '')"
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for _PARAMETER in ${CMDLINE}; do
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case "${_PARAMETER}" in
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ciss_crypt_path=*) CDLB_LUKS_FS="${_PARAMETER#ciss_crypt_path=}";;
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ciss_iso_label=* ) CDLB_ISO_LABEL="${_PARAMETER#ciss_iso_label=}";;
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esac
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done
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mkdir -p "${MNT_MEDIUM}" "${MNT_ROOTFS}"
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### Mount the live medium (ISO) read-only, unless already mounted --------------------------------------------------------------
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if ! mountpoint -q "${MNT_MEDIUM}"; then
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if [ -n "${CDLB_ISO_LABEL}" ] && [ -e "/dev/disk/by-label/${CDLB_ISO_LABEL}" ]; then
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mount -r -t iso9660 "/dev/disk/by-label/${CDLB_ISO_LABEL}" "${MNT_MEDIUM}" 2>/dev/null \
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|| mount -r -t udf "/dev/disk/by-label/${CDLB_ISO_LABEL}" "${MNT_MEDIUM}" 2>/dev/null \
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|| log "could not mount label=${CDLB_ISO_LABEL} (iso9660/udf)"
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fi
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fi
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if ! mountpoint -q "${MNT_MEDIUM}"; then
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### Fallback scan (covers SR drives and loop-mounted ISOs that udev exposed).
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for _dev in /dev/sr* /dev/cdrom /dev/disk/by-label/*; do
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### Skip non-block entries early.
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[ -b "${_dev}" ] || continue
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### Try ISO9660 first, then UDF; only unmount on failure
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if mount -r -t iso9660 "${_dev}" "${MNT_MEDIUM}" 2>/dev/null \
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|| mount -r -t udf "${_dev}" "${MNT_MEDIUM}" 2>/dev/null
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then
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mountpoint -q "${MNT_MEDIUM}" 2>/dev/null && break
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else
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umount "${MNT_MEDIUM}" 2>/dev/null || true
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fi
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done
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fi
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if ! mountpoint -q "${MNT_MEDIUM}"; then
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log "No live medium mounted, defer to default live-boot path."
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exit 0
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fi
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### Locate the encrypted root container on the medium. -------------------------------------------------------------------------
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if [ ! -f "${MNT_MEDIUM}/${CDLB_LUKS_FS}" ]; then
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log "Encrypted root not found at: [${MNT_MEDIUM}/${CDLB_LUKS_FS}]"
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exit 0
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fi
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### Create/read FIFO compatible with cryptsetup-initramfs (if present). This allows 'cryptroot-unlock' to feed the passphrase
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### over SSH (dropbear).
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mkdir -p /lib/cryptsetup
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[ -p /lib/cryptsetup/passfifo ] || mkfifo /lib/cryptsetup/passfifo
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### Attach a loop device read-only to the encrypted file. ----------------------------------------------------------------------
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LOOP="$(losetup -f --show -r "${MNT_MEDIUM}/${CDLB_LUKS_FS}")" || { log "losetup failed"; exit 42; }
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### Try to open the LUKS container, first via FIFO (SSH unlock), then interactively. -------------------------------------------
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attempts=0
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while true; do
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attempts=$((attempts+1))
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echo "Unlock '${CDLB_LUKS_FS}' (try ${attempts}): use 'cryptroot-unlock' over SSH or enter on console" >/dev/console 2>/dev/null || true
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## Non-blocking read from FIFO (Dropbear and cryptroot-unlock path).
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if timeout 5 cat /lib/cryptsetup/passfifo | cryptsetup open --type luks --readonly "${LOOP}" crypt_liveiso --key-file - 2>/dev/null; then
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break
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fi
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### Interactive fallback on the console.
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if cryptsetup open --type luks --readonly "${LOOP}" crypt_liveiso; then
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break
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fi
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done
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### Mount the decrypted payload as SquashFS under '/run/live/rootfs'. ----------------------------------------------------------
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mount -r -t squashfs /dev/mapper/crypt_liveiso "${MNT_ROOTFS}" || { log "mount squashfs failed"; exit 1; }
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### Ensure live-boot keeps using our medium (bind-mount for consistency). ------------------------------------------------------
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mount --bind "${MNT_MEDIUM}" "${MNT_MEDIUM}" 2>/dev/null || true
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log "Encrypted squashfs is mounted at: [${MNT_ROOTFS}] (device=/dev/mapper/crypt_liveiso)"
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printf "\e[92m[INFO] Successfully applied: [/usr/lib/live/boot/0024-ciss-crypt-squash] \n\e[0m"
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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