172 lines
5.9 KiB
Bash
172 lines
5.9 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' "${msg}"
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fi
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}
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### Declare variables. ---------------------------------------------------------------------------------------------------------
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export CDLB_ISO_LABEL="CISS.debian.live"
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export CDLB_LUKS_FS="/live/ciss_rootfs.crypt"
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export CDLB_MAPPER_NAME="ciss_rootfs.crypt"
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MNT_MEDIUM="/run/live/medium"
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MNT_ROOTFS="/run/live/rootfs"
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_PARAMETER=""
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_dev=""
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### Read the kernel cmdline once. ----------------------------------------------------------------------------------------------
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CMDLINE="$(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=*) export CDLB_LUKS_FS="${_PARAMETER#ciss_crypt_path=}";;
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ciss_iso_label=* ) export CDLB_ISO_LABEL="${_PARAMETER#ciss_iso_label=}";;
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esac
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done
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printf "\e[92m[INFO] CDLB_LUKS_FS : [%s] \n\e[0m" "${CDLB_LUKS_FS}"
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printf "\e[92m[INFO] CDLB_ISO_LABEL : [%s] \n\e[0m" "${CDLB_ISO_LABEL}"
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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 || mount -r -t udf "${_dev}" "${MNT_MEDIUM}" 2>/dev/null; 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 "${MNT_MEDIUM}"; then
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log "No live medium mounted, defer to default live-boot path."
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printf "\e[91m[FATAL] No live medium mounted, defer to default live-boot path. \n\e[0m"
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exit 0
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fi
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printf "\e[92m[INFO] MNT_MEDIUM : [%s] \n\e[0m" "${MNT_MEDIUM}"
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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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printf "\e[91m[FATAL] Encrypted root not found at: [%s/%s] \n\e[0m" "${MNT_MEDIUM}" "${CDLB_LUKS_FS}"
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exit 0
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fi
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printf "\e[92m[INFO] CISS LUKS FS : [%s/%s] \n\e[0m" "${MNT_MEDIUM}" "${CDLB_LUKS_FS}"
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### Create/read FIFO compatible with cryptsetup-initramfs. This allows 'cryptroot-unlock' to feed the passphrase over SSH. -----
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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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printf "\e[93m[INFO] Unlock: [%s] Attempt: [%s] Use 'cryptroot-unlock' over SSH or enter on console: \n\e[0m" \
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"${CDLB_LUKS_FS}" "${attempts}" >/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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### Expose the decrypted root device for live-boot overlay. The live-boot components will pick this up in '9990-overlay.sh'. ---
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echo "/dev/mapper/crypt_liveiso" >| /run/ciss-rootdev
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chmod 0644 /run/ciss-rootdev 2>/dev/null || true
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export CISS_ROOT_DEV="/dev/mapper/crypt_liveiso"
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export CISS_ROOT_DIR=""
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log "Decrypted root device exposed at [/run/ciss-rootdev] -> [/dev/mapper/crypt_liveiso]"
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printf "\e[92m[INFO] Decrypted root device exposed at: [/run/ciss-rootdev] -> [/dev/mapper/crypt_liveiso] \n\e[0m"
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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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