V8.13.408.2025.11.13

Signed-off-by: Marc S. Weidner <msw@coresecret.dev>

config/includes.chroot/usr/lib/live/boot/0024-ciss-crypt-squash

@@ -0,0 +1,170 @@
+#!/bin/sh
+# bashsupport disable=BP5007
+# shellcheck disable=SC2249
+# shellcheck shell=sh
+
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2025-11-12; 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
+
+# Purpose: Open /live/ciss_rootfs.crypt (LUKS) and present its SquashFS as /run/live/rootfs
+# Phase  : premount (executed by live-boot inside the initramfs)
+
+set -eu
+
+### Phase gate: run only in the intended live-boot phase -----------------------------------------------------------------------
+PHASE="${1:-}"
+
+case "${PHASE}" in
+
+  premount)
+    ;;      ### Continue.
+  *)
+    exit 0  ### Do nothing in other phases.
+    ;;
+
+esac
+
+printf "\e[95m[INFO] Starting: [/usr/lib/live/boot/0024-ciss-crypt-squash] ... \n\e[0m"
+
+#######################################
+# Premount logging helper.
+# Globals:
+#   None
+# Arguments:
+#   *: String to log.
+#######################################
+log() {
+  msg="$*"
+  if [ -w /dev/kmsg ]; then
+    printf '<6>%s: %s\n' '0024-ciss-crypt-squash' "${msg}" > /dev/kmsg
+  else
+    printf '%s: %s\n' '0024-ciss-crypt-squash' "${msg}"
+  fi
+}
+
+### Declare variables ----------------------------------------------------------------------------------------------------------
+CDLB_LUKS_FS="/live/ciss_rootfs.crypt"
+CDLB_ISO_LABEL="CISS.debian.live"
+MNT_MEDIUM="/run/live/medium"
+MNT_ROOTFS="/run/live/rootfs"
+_PARAMETER=""
+_dev=""
+
+for _PARAMETER in ${LIVE_BOOT_CMDLINE}; do
+
+  case "${_PARAMETER}" in
+
+    ciss_crypt_path=*) CDLB_LUKS_FS="${_PARAMETER#ciss_crypt_path=}";;
+    ciss_iso_label=* ) CDLB_ISO_LABEL="${_PARAMETER#ciss_iso_label=}";;
+
+  esac
+
+done
+
+mkdir -p "${MNT_MEDIUM}" "${MNT_ROOTFS}"
+
+### Mount the live medium (ISO) read-only, unless already mounted --------------------------------------------------------------
+if ! mountpoint -q "${MNT_MEDIUM}"; then
+
+  if [ -n "${CDLB_ISO_LABEL}" ] && [ -e "/dev/disk/by-label/${CDLB_ISO_LABEL}" ]; then
+
+    mount -r -t iso9660 "/dev/disk/by-label/${CDLB_ISO_LABEL}" "${MNT_MEDIUM}" 2>/dev/null \
+      || mount -r -t udf "/dev/disk/by-label/${CDLB_ISO_LABEL}" "${MNT_MEDIUM}" 2>/dev/null \
+      || log "could not mount label=${CDLB_ISO_LABEL} (iso9660/udf)"
+
+  fi
+
+fi
+
+if ! mountpoint -q "${MNT_MEDIUM}"; then
+
+  ### Fallback scan (covers SR drives and loop-mounted ISOs that udev exposed).
+  for _dev in /dev/sr* /dev/cdrom /dev/disk/by-label/*; do
+
+    ### Skip non-block entries early.
+    [ -b "${_dev}" ] || continue
+
+    ### Try ISO9660 first, then UDF; only unmount on failure
+    if mount -r -t iso9660 "${_dev}" "${MNT_MEDIUM}" 2>/dev/null \
+      || mount -r -t udf   "${_dev}" "${MNT_MEDIUM}" 2>/dev/null
+    then
+
+      mountpoint -q "${MNT_MEDIUM}" 2>/dev/null && break
+
+    else
+
+      umount "${MNT_MEDIUM}" 2>/dev/null || true
+
+    fi
+
+  done
+
+fi
+
+if ! mountpoint -q "${MNT_MEDIUM}"; then
+
+  log "no live medium mounted – defer to default live-boot path"
+  exit 0
+
+fi
+
+### Locate the encrypted root container on the medium. -------------------------------------------------------------------------
+if [ ! -f "${MNT_MEDIUM}/${CDLB_LUKS_FS}" ]; then
+
+  log "encrypted root not found at ${MNT_MEDIUM}/${CDLB_LUKS_FS}"
+  exit 0
+
+fi
+
+### Create/read FIFO compatible with cryptsetup-initramfs (if present). This allows 'cryptroot-unlock' to feed the passphrase
+### over SSH (dropbear).
+mkdir -p /lib/cryptsetup
+[ -p /lib/cryptsetup/passfifo ] || mkfifo /lib/cryptsetup/passfifo
+
+### Attach a loop device read-only to the encrypted file. ----------------------------------------------------------------------
+LOOP="$(losetup -f --show -r "${MNT_MEDIUM}/${CDLB_LUKS_FS}")" || { log "losetup failed"; exit 42; }
+
+### Try to open the LUKS container, first via FIFO (SSH unlock), then interactively. -------------------------------------------
+attempts=0
+while true; do
+
+  attempts=$((attempts+1))
+  echo "Unlock '${CDLB_LUKS_FS}' (try ${attempts}): use 'cryptroot-unlock' over SSH or enter on console" >/dev/console 2>/dev/null || true
+
+  ## Non-blocking read from FIFO (Dropbear and cryptroot-unlock path).
+  if timeout 5 cat /lib/cryptsetup/passfifo | cryptsetup open --type luks --readonly "${LOOP}" crypt_liveiso --key-file - 2>/dev/null; then
+
+    break
+
+  fi
+
+  ### Interactive fallback on the console.
+  if cryptsetup open --type luks --readonly "${LOOP}" crypt_liveiso; then
+
+    break
+
+  fi
+
+done
+
+### Mount the decrypted payload as SquashFS under '/run/live/rootfs'. ----------------------------------------------------------
+mount -r -t squashfs /dev/mapper/crypt_liveiso "${MNT_ROOTFS}" || { log "mount squashfs failed"; exit 1; }
+
+### Ensure live-boot keeps using our medium (bind-mount for consistency). ------------------------------------------------------
+mount --bind "${MNT_MEDIUM}" "${MNT_MEDIUM}" 2>/dev/null || true
+
+log "encrypted squashfs is mounted at ${MNT_ROOTFS} (device=/dev/mapper/crypt_liveiso)"
+
+printf "\e[92m[INFO] Successfully applied: [/usr/lib/live/boot/0024-ciss-crypt-squash] \n\e[0m"
+
+exit 0
+
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh