V8.13.408.2025.11.13

Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
2025-11-13 06:26:44 +01:00
parent a362db3d78
commit 5f370c2cdb
83 changed files with 1422 additions and 877 deletions
--- a/config/hooks/live/0001_initramfs_modules.chroot
+++ b/config/hooks/live/0001_initramfs_modules.chroot
@@ -58,6 +58,7 @@ readonly -f grep_nic_driver_modules

 # shellcheck disable=SC2155
 declare nic_driver="$(grep_nic_driver_modules)" VAR_DATE="$(date +%F)"
+
 cat << EOF >| /etc/initramfs-tools/modules
 # SPDX-Version: 3.0
 # SPDX-CreationInfo: ${VAR_DATE}; WEIDNER, Marc S.; <msw@coresecret.dev>
--- a/config/hooks/live/0002_hardening_overlay_tmpfs.chroot
+++ b/config/hooks/live/0002_hardening_overlay_tmpfs.chroot
@@ -0,0 +1,63 @@
+#!/bin/bash
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2025-11-12; WEIDNER, Marc S.; <msw@coresecret.dev>
+# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.git
+# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
+# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
+# SPDX-FileType: SOURCE
+# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
+# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
+# SPDX-PackageName: CISS.debian.live.builder
+# SPDX-Security-Contact: security@coresecret.eu
+set -Ceuo pipefail
+
+printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 '%s' starting ... \e[0m\n" "${0}"
+
+VAR_DATE="$(date +%F)"
+
+cat << EOF >| /etc/systemd/system/ciss-remount-root.service
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: ${VAR_DATE}; WEIDNER, Marc S.; <msw@coresecret.dev>
+# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.git
+# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
+# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
+# SPDX-FileType: SOURCE
+# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
+# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
+# SPDX-PackageName: CISS.debian.live.builder
+# SPDX-Security-Contact: security@coresecret.eu
+
+[Unit]
+Description=Remount overlay root with nosuid,nodev
+DefaultDependencies=no
+After=local-fs.target
+Before=basic.target
+
+[Service]
+Type=oneshot
+ExecStart=/bin/mount -o remount,nosuid,nodev /
+
+[Install]
+WantedBy=sysinit.target
+
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=conf
+EOF
+
+mkdir -p /etc/systemd/system/tmp.mount.d
+cat << EOF >| /etc/systemd/system/tmp.mount.d/override.conf
+[Mount]
+Options=mode=1777,strictatime,nosuid,nodev,noexec,size=1%
+EOF
+
+mkdir -p /etc/systemd/system/dev-shm.mount.d
+cat << EOF >| /etc/systemd/system/dev-shm.mount.d/override.conf
+[Mount]
+Options=mode=1777,nosuid,nodev,noexec,size=25%
+EOF
+
+systemctl enable ciss-remount-root.service
+
+printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ '%s' applied successfully. \e[0m\n" "${0}"
+
+exit 0
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
--- a/config/hooks/live/0021_dropbear_initramfs.chroot
+++ b/config/hooks/live/0021_dropbear_initramfs.chroot
@@ -19,21 +19,22 @@ declare var_logfile="/root/.ciss/cdlb/log/0021_dropbear_initramfs.log"
 [[ -r /root/ciss_xdg_tmp.sh ]] && . /root/ciss_xdg_tmp.sh
 export DEBIAN_FRONTEND="noninteractive" INITRD="No"

-apt-get install -y --no-install-recommends --no-install-suggests dropbear-initramfs dropbear-bin 2>&1 | tee -a "${var_logfile}"
+apt-get install -y --no-install-recommends --no-install-suggests cryptsetup-initramfs dropbear-initramfs dropbear-bin 2>&1 | tee -a "${var_logfile}"
 apt-get purge -y dropbear 2>&1 | tee -a "${var_logfile}" || true
 apt-get install -y --no-install-recommends --no-install-suggests gpgv 2>&1 | tee -a "${var_logfile}"
 apt-mark hold dropbear dropbear-initramfs 2>&1 | tee -a "${var_logfile}"

-mv /usr/share/initramfs-tools/scripts/init-premount/dropbear /usr/share/initramfs-tools/scripts/init-premount/dropbear.trixie
+mkdir -p /root/.ciss/cdlb/backup/usr/share/initramfs-tools/scripts/init-premount
+mv /usr/share/initramfs-tools/scripts/init-premount/dropbear /root/.ciss/cdlb/backup/usr/share/initramfs-tools/scripts/init-premount/dropbear.trixie
 install -m 0755 -o root -g root /root/dropbear.file /usr/share/initramfs-tools/scripts/init-premount/dropbear
 rm -f /root/dropbear.file

-mv /usr/sbin/dropbear /usr/sbin/dropbear.trixie
+mv /usr/sbin/dropbear /root/.ciss/cdlb/backup/usr/sbin/dropbear.trixie
 install -m 0755 -o root -g root /root/build/dropbear-2025.88/dropbear /usr/sbin/

 for var_file in dbclient dropbearconvert dropbearkey; do

-  mv "/usr/bin/${var_file}" "/usr/bin/${var_file}.trixie"
+  mv "/usr/bin/${var_file}" "/root/.ciss/cdlb/backup/usr/bin/${var_file}.trixie"
  install -m 0755 -o root -g root "/root/build/dropbear-2025.88/${var_file}" /usr/bin/

 done
--- a/config/hooks/live/0100_ciss_mem_wipe.chroot
+++ b/config/hooks/live/0100_ciss_mem_wipe.chroot
@@ -0,0 +1,209 @@
+#!/bin/bash
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2025-10-11; 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
+set -Ceuo pipefail
+
+printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 '%s' starting ... \e[0m\n" "${0}"
+
+[[ -r /root/ciss_xdg_tmp.sh ]] && . /root/ciss_xdg_tmp.sh
+export DEBIAN_FRONTEND="noninteractive" INITRD="No"
+
+apt-get install -y --no-install-recommends kexec-tools busybox-static
+
+install -d -m 0755 /boot/ciss-memwipe
+install -d -m 0755 /usr/local/sbin
+install -d -m 0755 /etc/systemd/system
+install -d -m 0755 /etc/default
+
+### Pick a kernel to kexec into: use the latest installed vmlinuz. -------------------------------------------------------------
+# shellcheck disable=SC2012,SC2155
+declare _kernel="$(cd /boot && ls -1 vmlinuz-* | sed 's|vmlinuz-||' | sort -V | tail -n1)"
+cp -f "/boot/vmlinuz-${_kernel}" /boot/ciss-memwipe/vmlinuz
+
+### Build minimal initramfs with a busybox and a tiny '/init'. -----------------------------------------------------------------
+declare TMPDIR; TMPDIR="$(mktemp -d)"
+trap 'rm -rf "${TMPDIR}"' EXIT
+
+mkdir -p "${TMPDIR}"/{bin,dev,proc,sys,wipe}
+cp -f /bin/busybox.static "${TMPDIR}/bin/busybox"
+
+cat << 'EOF' >| "${TMPDIR}/init"
+#!/bin/busybox sh
+### Minimal init to wipe RAM, then power off.
+### Parses cmdline: ciss_wipe_passes=2 ciss_wipe_mode=zero+random ciss_dd_bs=64M ciss_tmpfs_pct=95
+set -eu
+
+get_arg() { # $1=key ; echoes value or empty
+
+  for tok in $(cat /proc/cmdline); do
+
+    case "${tok}" in
+      $1=*) echo "${tok#*=}"; return 0;;
+    esac
+
+  done
+
+  echo ""
+}
+
+mount -t devtmpfs devtmpfs /dev 2>/dev/null || true
+[ -e /dev/console ] || mknod -m 600 /dev/console c 5 1
+[ -e /dev/null ]    || mknod -m 666 /dev/null c 1 3
+[ -e /dev/urandom ] || mknod -m 444 /dev/urandom c 1 9
+
+mount -t proc proc /proc
+mount -t sysfs sysfs /sys
+
+PASSES="$(get_arg ciss_wipe_passes)"; [ -n "${PASSES}" ] || PASSES=2
+MODE="$(get_arg ciss_wipe_mode)"; [ -n "${MODE}" ] || MODE="zero+random"
+BS="$(get_arg ciss_dd_bs)"; [ -n "${BS}" ] || BS=64M
+PCT="$(get_arg ciss_tmpfs_pct)"; [ -n "${PCT}" ] || PCT=95
+
+echo 1 > /proc/sys/kernel/printk 2>/dev/null || true
+
+MEM_KB="$(awk '/MemTotal:/ {print $2}' /proc/meminfo)"
+SIZE_KB=$(( MEM_KB * PCT / 100 ))
+mount -t tmpfs -o "size=${SIZE_KB}k,nodev,nosuid,noexec,mode=0700" tmpfs /wipe
+
+wipe_pass() {
+  pattern="$1"
+  if [ "${pattern}" = "zero" ]; then
+    src="/dev/zero"
+  else
+    src="/dev/urandom"
+  fi
+
+  i=0
+  while :; do
+    busybox dd if="${src}" of="/wipe/block_${i}" bs="${BS}" status=none || break
+    i=$((i+1))
+  done
+  sync
+  echo 3 > /proc/sys/vm/drop_caches 2>/dev/null || true
+  rm -f /wipe/block_* 2>/dev/null || true
+  sync
+}
+
+DO_ZERO=0; DO_RANDOM=0
+case "${MODE}" in
+  zero) DO_ZERO=1 ;;
+  random) DO_RANDOM=1 ;;
+  zero+random|random+zero) DO_ZERO=1; DO_RANDOM=1 ;;
+  *) DO_ZERO=1 ;;
+esac
+
+p=1
+while [ ${p} -le "${PASSES}" ]; do
+  [ ${DO_ZERO} -eq 1 ] && wipe_pass zero
+  [ ${DO_RANDOM} -eq 1 ] && wipe_pass random
+  p=$((p+1))
+done
+
+sync
+busybox poweroff -f || echo o >| /proc/sysrq-trigger
+EOF
+
+chmod +x "${TMPDIR}/init"
+
+( cd "${TMPDIR}" && find . -print0 | cpio --null -ov --format=newc ) | gzip -9 > /boot/ciss-memwipe/initrd.img
+
+cat << 'EOF' >| /etc/default/ciss-memwipe
+### CISS Memory Wipe defaults
+CISS_WIPE_PASSES=2           # number of passes
+CISS_WIPE_MODE="zero+random" # zero | random | zero+random
+CISS_WIPE_DD_BS="64M"        # dd block size
+CISS_WIPE_TMPFS_PCT=95       # percentage of MemTotal to allocate
+EOF
+
+cat << 'EOF' >| /usr/local/sbin/ciss-memwipe
+#!/bin/bash
+# Prepare and execute kexec-based memory wipe.
+set -euo pipefail
+
+. /etc/default/ciss-memwipe || true
+
+KERNEL="/boot/ciss-memwipe/vmlinuz"
+INITRD="/boot/ciss-memwipe/initrd.img"
+
+append_common="quiet loglevel=1 ciss_wipe_passes=${CISS_WIPE_PASSES:-2} ciss_wipe_mode=${CISS_WIPE_MODE:-zero+random} ciss_dd_bs=${CISS_WIPE_DD_BS:-64M} ciss_tmpfs_pct=${CISS_WIPE_TMPFS_PCT:-95}"
+
+prepare() {
+  # Try to allow kexec if not locked down
+  if [ -w /proc/sys/kernel/kexec_load_disabled ] && [ "$(cat /proc/sys/kernel/kexec_load_disabled)" = "1" ]; then
+    echo 0 > /proc/sys/kernel/kexec_load_disabled || true
+  fi
+  # Load wipe kernel
+  if command -v kexec >/dev/null 2>&1 && [ -s "${KERNEL}" ] && [ -s "${INITRD}" ]; then
+    kexec -l "${KERNEL}" --initrd="${INITRD}" --append="${append_common}" || true
+  fi
+}
+
+fallback_inplace() {
+  # Last-resort: wipe in-place via tmpfs and then power off
+  mount -t tmpfs -o "size=95%,nodev,nosuid,noexec,mode=0700" tmpfs /run/wipe 2>/dev/null || mkdir -p /run/wipe
+  i=0
+  while :; do
+    dd if=/dev/zero of="/run/wipe/blk_${i}" bs="${CISS_WIPE_DD_BS:-64M}" status=none || break
+    i=$((i+1))
+  done
+  sync; echo 3 > /proc/sys/vm/drop_caches 2>/dev/null || true
+  rm -f /run/wipe/blk_* 2>/dev/null || true
+  sync
+  systemctl poweroff -f || poweroff -f || echo o > /proc/sysrq-trigger
+}
+
+execute() {
+  sync; echo 3 > /proc/sys/vm/drop_caches 2>/dev/null || true
+  # Prefer systemd's path if possible
+  if command -v systemctl >/dev/null 2>&1 && systemctl --quiet is-system-running; then
+    # If kexec image was loaded, systemctl kexec will use it
+    systemctl kexec || kexec -e || fallback_inplace
+  else
+    kexec -e || fallback_inplace
+  fi
+}
+
+case "${1:-}" in
+  prepare) prepare ;;
+  execute) execute ;;
+  *) echo "Usage: $0 {prepare|execute}" >&2; exit 2 ;;
+esac
+EOF
+chmod 0755 /usr/local/sbin/ciss-memwipe
+
+### Systemd service: load at boot, execute on shutdown
+cat << 'EOF' >| /etc/systemd/system/ciss-memwipe.service
+[Unit]
+Description=CISS: preload and execute kexec-based RAM wipe on shutdown
+DefaultDependencies=no
+# Ensure we run late enough on shutdown, but early enough to take over
+Before=shutdown.target
+After=local-fs.target network.target multi-user.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/local/sbin/ciss-memwipe prepare
+# ExecStop runs during shutdown: jump into wipe kernel
+ExecStop=/usr/local/sbin/ciss-memwipe execute
+TimeoutStartSec=20s
+TimeoutStopSec=infinity
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+systemctl enable ciss-memwipe.service
+
+printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ '%s' applied successfully. \e[0m\n" "${0}"
+
+exit 0
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
--- a/config/hooks/live/9999_zzzz.chroot
+++ b/config/hooks/live/9999_zzzz.chroot
@@ -18,9 +18,14 @@ declare var_dm="" var_unit_dir="" var_link="/etc/systemd/system/default.target"
 ### Remove CDLB artifacts ------------------------------------------------------------------------------------------------------
 rm -f  /root/ciss_xdg_tmp.sh
 rm -fr /root/build
+find / -xdev \( -path /proc -o -path /sys -o -path /dev -o -path /run \) -prune -o -type f -name '.keep' -exec rm -f -- {} +
+
+### Securing '/.ciss' ----------------------------------------------------------------------------------------------------------
+find /.ciss -type d -exec chmod 0700 {} +
+find /.ciss -type f -exec chmod 0440 {} +

 ### Securing '/etc/ciss/keys' --------------------------------------------------------------------------------------------------
-find /etc/ciss/keys -type f -exec chmod 0444 {} +
+find /etc/ciss/keys -type f -exec chmod 0440 {} +

 ### Regenerate the initramfs for the live system kernel ------------------------------------------------------------------------
 update-initramfs -u -k all -v
--- a/config/hooks/live/zzzz_ciss_crypt_squash.hook.binary
+++ b/config/hooks/live/zzzz_ciss_crypt_squash.hook.binary
@@ -60,7 +60,7 @@ readonly -f preallocate
 printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 '%s' starting ... \e[0m\n" "${0}"

 declare ROOTFS="${VAR_HANDLER_BUILD_DIR}/binary/live/filesystem.squashfs"
-declare LUKSFS="${VAR_HANDLER_BUILD_DIR}/binary/live/rootfs.crypt"
+declare LUKSFS="${VAR_HANDLER_BUILD_DIR}/binary/live/ciss_rootfs.crypt"
 declare KEYFD=""

 # shellcheck disable=SC2155
--- a/config/includes.chroot/.ciss/.keep
+++ b/config/includes.chroot/.ciss/.keep
@@ -0,0 +1,10 @@
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2025-10-28; 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
--- a/config/includes.chroot/.ciss/attestation/.keep
+++ b/config/includes.chroot/.ciss/attestation/.keep
@@ -0,0 +1,10 @@
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2025-10-28; 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
--- a/config/includes.chroot/etc/ciss/.keep
+++ b/config/includes.chroot/etc/ciss/.keep
@@ -0,0 +1,10 @@
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2025-10-28; 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
--- a/config/includes.chroot/etc/initramfs-tools/.keep
+++ b/config/includes.chroot/etc/initramfs-tools/.keep
@@ -0,0 +1,10 @@
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2025-10-28; 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
--- a/config/includes.chroot/etc/initramfs-tools/files/unlock_wrapper.sh
+++ b/config/includes.chroot/etc/initramfs-tools/files/unlock_wrapper.sh
@@ -1,22 +1,27 @@
 #!/bin/bash
 # SPDX-Version: 3.0
-# SPDX-CreationInfo: 2025-06-17; WEIDNER, Marc S.; <msw@coresecret.dev>
-# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.installer.git
+# 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.installer
+# SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu
 # SPDX-Comment: unlock_wrapper.sh to be executed as 'dropbear-initramfs' SSH forced command.
+# shellcheck disable=SC2034

 set -Ceu -o pipefail -o ignoreeof
 shopt -s failglob
 shopt -s lastpipe
 shopt -u nullglob
 umask 0077
-export PATH="/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr"
+declare -g PATH="/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr"
+
+### Will be replaced at build time:
+declare -gr CDLB_DB_EXP_FPR="@EXP_FPR@"
+declare -gr CDLB_DB_EXP_CA_FPR="@EXP_CA_FPR@"

 #######################################
 # Variable declaration
@@ -383,7 +388,7 @@ verify_script() {

    color_echo "${MAG}" "🔏 Verifying signature of: [${hashfile}]"

-    if ! gpgv --keyring /etc/ciss/keys/unlock_wrapper_pubring.gpg "${sigfile}" "${hashfile}"; then
+    if ! gpgv --keyring /etc/ciss/keys/"${sigfile}".gpg "${sigfile}" "${hashfile}"; then

      color_echo "${RED}" "✘ Signature verification failed for: [${hashfile}]"
      color_echo "${RED}" "✘ System Power Off in 3 seconds."
--- a/config/includes.chroot/etc/initramfs-tools/files/unlock_wrapper_signer.sh
+++ b/config/includes.chroot/etc/initramfs-tools/files/unlock_wrapper_signer.sh
@@ -1,13 +1,13 @@
 #!/bin/bash
 # SPDX-Version: 3.0
-# SPDX-CreationInfo: 2025-06-17; WEIDNER, Marc S.; <msw@coresecret.dev>
-# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.installer.git
+# 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.installer
+# SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu
 # SPDX-Comment: unlock_wrapper_signer.sh for signing unlock_wrapper.sh

--- a/config/includes.chroot/etc/initramfs-tools/hooks/9999_ciss_custom_prompt.sh
+++ b/config/includes.chroot/etc/initramfs-tools/hooks/9999_ciss_custom_prompt.sh
@@ -3,7 +3,7 @@
 # shellcheck shell=sh

 # SPDX-Version: 3.0
-# SPDX-CreationInfo: 2025-11-10; WEIDNER, Marc S.; <msw@coresecret.dev>
+# 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>
--- a/config/includes.chroot/etc/initramfs-tools/hooks/9999_ciss_debian_live_builder.sh
+++ b/config/includes.chroot/etc/initramfs-tools/hooks/9999_ciss_debian_live_builder.sh
@@ -3,7 +3,7 @@
 # shellcheck shell=sh

 # SPDX-Version: 3.0
-# SPDX-CreationInfo: 2025-11-10; WEIDNER, Marc S.; <msw@coresecret.dev>
+# 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>
@@ -47,8 +47,13 @@ printf "\e[92mSuccessfully executed: [copy_exec /usr/sbin/blkid /usr/sbin/blkid]


 ### Include 'busybox' ----------------------------------------------------------------------------------------------------------
-copy_exec /usr/bin/busybox /usr/busybox
-printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/busybox /usr/busybox] \n\e[0m"
+copy_exec /usr/bin/busybox /usr/bin/busybox
+printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/busybox /usr/bin/busybox] \n\e[0m"
+
+
+### Include 'dmsetup' ----------------------------------------------------------------------------------------------------------
+copy_exec /usr/sbin/dmsetup /usr/sbin/dmsetup
+printf "\e[92mSuccessfully executed: [copy_exec /usr/sbin/dmsetup /usr/sbin/dmsetup] \n\e[0m"


 ### Include GNU coreutils 'sort' (has -V) --------------------------------------------------------------------------------------
--- a/config/includes.chroot/etc/initramfs-tools/scripts/init-premount/1000_ciss_fixpath.sh
+++ b/config/includes.chroot/etc/initramfs-tools/scripts/init-premount/1000_ciss_fixpath.sh
@@ -3,7 +3,7 @@
 # shellcheck shell=sh

 # SPDX-Version: 3.0
-# SPDX-CreationInfo: 2025-11-10; WEIDNER, Marc S.; <msw@coresecret.dev>
+# 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>
--- a/config/includes.chroot/etc/initramfs-tools/scripts/init-top/0000_ciss_fixpath.sh
+++ b/config/includes.chroot/etc/initramfs-tools/scripts/init-top/0000_ciss_fixpath.sh
@@ -3,7 +3,7 @@
 # shellcheck shell=sh

 # SPDX-Version: 3.0
-# SPDX-CreationInfo: 2025-11-10; WEIDNER, Marc S.; <msw@coresecret.dev>
+# 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>
--- a/config/includes.chroot/etc/ssh/ssh_known_hosts
+++ b/config/includes.chroot/etc/ssh/ssh_known_hosts
@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V8.13.404.2025.11.10
+# Version Master V8.13.408.2025.11.13

 [git.coresecret.dev]:42842 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGQA107AVmg1D/jnyXiqbPf38zQRl8s3c+PM1zbfpeQl
 [git.coresecret.dev]:42842 ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAACAQDYD9ysmMWZlejUnxu0qOzeWcIYezoFLbYdo6ffGUL5kqOBAYb+5CF4bJLUpA93XFYVF+TbrcMV1yJh6JaHFL0VU5CvgAzruCeedx0c4qUV6lWcJUGNk5K0yb9n2Wosdy6F/zTOxL9KXBt/TV+cscsen2Dahvx0ctMKgNbu+vvUcWxHf9lOkbYoF/uA/nW5CVXy5XUPVUDFUhEeKXL85+6gid5AEMfYT8aRl5YDGvo1iMBmBYOljN4S7MnRe14qbAZG0GDGvF22eHbSU2pILcFIjc2Lo/S5Ox/MJpbLAqpFlLPTKgr6F7yVwfNMSNwl05ysUOZfrQKSXzCU6+lfqKYCwemLALyG/n1ernpp7/8W/2RYoz3fd+TQyfhW++rx3yUHpYCkTv9A4LRYZYGSAWKMHSBEYq3EcATQUxQi0xpwmcR+u0uC9F9eta5Bim+sBZD6F2hgPJ5xgYT8LFm880g1YadAwBoD4TAkqSvl+jYW0VA2GH9CknKHJ36gc/X4eeUHDC1Hf/E8M5RBj4D6NuHfeVRik/ahHmoCqKQUW7VU/EBsWFsngDiLEHcV71iMtWiUddWOHwoAPHIzn6p9HTeLCxTwsPMG5UDGK/S9HUozqDXxexRtqbcFa7DWuzRvZ1bcZ2VQsaafuzKCkkc4NjC7h1wssel7q9aeYPFg+1vS6Q==
--- a/config/includes.chroot/etc/ssh/sshd_config
+++ b/config/includes.chroot/etc/ssh/sshd_config
@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V8.13.404.2025.11.10
+# Version Master V8.13.408.2025.11.13

 ### https://www.ssh-audit.com/
 ### ssh -Q cipher | cipher-auth | compression | kex | kex-gss | key | key-cert | key-plain | key-sig | mac | protocol-version | sig
--- a/config/includes.chroot/etc/sysctl.d/99_local.hardened
+++ b/config/includes.chroot/etc/sysctl.d/99_local.hardened
@@ -11,7 +11,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V8.13.404.2025.11.10
+# Version Master V8.13.408.2025.11.13

 ### https://docs.kernel.org/
 ### https://github.com/a13xp0p0v/kernel-hardening-checker/
@@ -184,13 +184,13 @@ vm.mmap_rnd_compat_bits=16
 # settings.
 ###########################################################################################
 fs.suid_dumpable=0
-kernel.core_pattern= | /bin/false
+kernel.core_pattern=|/bin/false

 ### Disable User Namespaces, as it opens up a large attack surface to unprivileged users.
 #user.max_user_namespaces=0

 ###########################################################################################
-# Reboot after even 1 WARN or BUG/Oops. Adjust for your tolerances. (Since v6.2)
+# Reboot after even 1 WARN or BUG/Oops. Adjust for your tolerances. (From v6.2)
 # If you want to set oops_limit greater than one, you will need to disable
 # CONFIG_PANIC_ON_OOPS.
 ###########################################################################################
--- a/config/includes.chroot/etc/systemd/.keep
+++ b/config/includes.chroot/etc/systemd/.keep
@@ -0,0 +1,10 @@
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2025-10-28; 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
--- a/config/includes.chroot/etc/systemd/system/.keep
+++ b/config/includes.chroot/etc/systemd/system/.keep
@@ -0,0 +1,10 @@
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2025-10-28; 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
--- a/config/includes.chroot/preseed/.iso/preseed_hash_generator.sh
+++ b/config/includes.chroot/preseed/.iso/preseed_hash_generator.sh
@@ -10,7 +10,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-declare -gr VERSION="Master V8.13.404.2025.11.10"
+declare -gr VERSION="Master V8.13.408.2025.11.13"

 ### VERY EARLY CHECK FOR DEBUGGING
 if [[ $* == *" --debug "* ]]; then
--- a/config/includes.chroot/preseed/preseed.cfg
+++ b/config/includes.chroot/preseed/preseed.cfg
@@ -112,4 +112,4 @@ d-i preseed/late_command string sh /preseed/.ash/3_di_preseed_late_command.sh

 # Please consider donating to my work at: https://coresecret.eu/spenden/
 ###########################################################################################
-# Written by: ./preseed_hash_generator.sh Version: Master V8.13.404.2025.11.10 at: 10:18:37.9542
+# Written by: ./preseed_hash_generator.sh Version: Master V8.13.408.2025.11.13 at: 10:18:37.9542
--- a/config/includes.chroot/usr/lib/live/boot/0022-ciss-overlay-tmpfs.sh
+++ b/config/includes.chroot/usr/lib/live/boot/0022-ciss-overlay-tmpfs.sh
@@ -0,0 +1,60 @@
+#!/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: Pre-create constrained tmpfs for OverlayFS upper/work before live-boot mounts overlay.
+# 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/0022-ciss-overlay-tmpfs.sh] ... \n\e[0m"
+
+### Declare variables ----------------------------------------------------------------------------------------------------------
+OVERLAY_BASE="/run/live/overlay"
+UPPER="${OVERLAY_BASE}/upper"
+WORK="${OVERLAY_BASE}/work"
+
+### Size policy: hard ceiling to mitigate RAM-filling DoS; tune to your ISO profile.
+: "${CDLB_OVERLAY_TMPFS_SIZE:=70%}"
+
+### Create a base dir with restrictive perms.
+# shellcheck disable=SC2174
+mkdir -p -m 0700 "${OVERLAY_BASE}"
+
+### Mount dedicated tmpfs with strict flags; 'noexec' here blocks accidental execs from the raw tmpfs path.
+mount -t tmpfs -o "size=${CDLB_OVERLAY_TMPFS_SIZE},mode=0700,nosuid,nodev,noexec" tmpfs "${OVERLAY_BASE}"
+
+# Prepare upper/work with tight perms.
+# shellcheck disable=SC2174
+mkdir -p -m 0700 "${UPPER}" "${WORK}"
+
+printf "\e[92m[INFO] Successfully applied: [/usr/lib/live/boot/0022-ciss-overlay-tmpfs.sh] \n\e[0m"
+
+exit 0
+
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
--- a/config/includes.chroot/usr/lib/live/boot/0024-ciss-crypt-squash
+++ b/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 ${MNT_ROOTFS} (device=/dev/mapper/crypt_liveiso)"
+
+printf "\e[92m[INFO] Successfully applied: [/usr/lib/live/boot/0024-ciss-crypt-squash] \n\e[0m"
+
+exit 0
+
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
--- a/config/includes.chroot/usr/lib/live/boot/0026-ciss-early-sysctl.sh
+++ b/config/includes.chroot/usr/lib/live/boot/0026-ciss-early-sysctl.sh
@@ -0,0 +1,50 @@
+#!/bin/sh
+# bashsupport disable=BP5007
+# shellcheck disable=SC2249
+# shellcheck shell=sh
+
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2025-11-12; WEIDNER, Marc S.; <msw@coresecret.dev>
+# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.git
+# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
+# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
+# SPDX-FileType: SOURCE
+# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
+# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
+# SPDX-PackageName: CISS.debian.live.builder
+# SPDX-Security-Contact: security@coresecret.eu
+
+# Purpose: Enforce early sysctls before services start.
+# Phase  : premount (executed by live-boot inside the initramfs).
+
+set -eu
+
+### Phase gate: run only in the intended live-boot phase -----------------------------------------------------------------------
+PHASE="${1:-}"
+
+case "${PHASE}" in
+
+  premount)
+    ;;      ### Continue.
+  *)
+    exit 0  ### Do nothing in other phases.
+    ;;
+
+esac
+
+printf "\e[95m[INFO] Starting: [/usr/lib/live/boot/0026-ciss-early-sysctl.sh] ... \n\e[0m"
+
+echo 2 > /proc/sys/kernel/yama/ptrace_scope 2>/dev/null || true
+echo 1 > /proc/sys/kernel/unprivileged_bpf_disabled 2>/dev/null || true
+echo 0 > /proc/sys/fs/suid_dumpable 2>/dev/null || true
+echo 1 > /proc/sys/kernel/kexec_load_disabled 2>/dev/null || true
+echo 1 > /proc/sys/fs/protected_symlinks 2>/dev/null || true
+echo 1 > /proc/sys/fs/protected_hardlinks 2>/dev/null || true
+echo 2 > /proc/sys/fs/protected_regular 2>/dev/null || true
+echo 2 > /proc/sys/kernel/kptr_restrict 2>/dev/null || true
+
+printf "\e[92m[INFO] Successfully applied: [/usr/lib/live/boot/0026-ciss-early-sysctl.sh] \n\e[0m"
+
+exit 0
+
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
--- a/config/includes.chroot/usr/lib/live/boot/0030-ciss-verify-checksums
+++ b/config/includes.chroot/usr/lib/live/boot/0030-ciss-verify-checksums
@@ -4,7 +4,7 @@
 # shellcheck shell=sh

 # SPDX-Version: 3.0
-# SPDX-CreationInfo: 2025-10-28; WEIDNER, Marc S.; <msw@coresecret.dev>
+# 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>
@@ -15,11 +15,11 @@
 # SPDX-Security-Contact: security@coresecret.eu

 ### Modified Version of the original file:
-### https://salsa.debian.org/live-team/live-boot 'components/0030-verify-checksums'
+### https://salsa.debian.org/live-team/live-boot 'components/0030-ciss-verify-checksums'
 ### In case of successful verification of the offered checksum, proceed with booting; otherwise panic.

 #######################################
-# Modified checksum-integrity and authenticity-verification-script for continuing the boot process.
+# Modified checksum-integrity and authenticity-verification-script depending on pinned GPG FPR for boot process verification.
 # Globals:
 #   LIVE_BOOT_CMDLINE
 #   _TTY
@@ -29,9 +29,43 @@
 #   0 : Successful verification
 #######################################
 Verify_checksums() {
-  printf "\e[95m[INFO] CDLB modified: [/usr/lib/live/boot/0030-verify-checksums] ... \n\e[0m"
+  printf "\e[95m[INFO] CDLB modified: [/usr/lib/live/boot/0030-ciss-verify-checksums] ... \n\e[0m"

  ### Declare variables --------------------------------------------------------------------------------------------------------
+
+  ### Will be replaced at build time:
+  export CDLB_EXP_FPR="@EXP_FPR@"
+  export CDLB_EXP_CA_FPR="@EXP_CA_FPR@"
+
+  ### Declare functions --------------------------------------------------------------------------------------------------------
+
+  #######################################
+  # Helper for colored text output on stdout.
+  # Globals:
+  #   None
+  # Arguments:
+  #   *: String to print
+  #######################################
+  log_in() { printf '\e[95m[INFO]  %s \n\e[0m' "$*"; }
+
+  #######################################
+  # Helper for colored text output on stdout.
+  # Globals:
+  #   None
+  # Arguments:
+  #   *: String to print
+  #######################################
+  log_ok() { printf '\e[92m[INFO]  %s \n\e[0m' "$*"; }
+
+  #######################################
+  # Helper for colored text output on stdout.
+  # Globals:
+  #   None
+  # Arguments:
+  #   *: String to print
+  #######################################
+  log_er() { printf '\e[91m[FATAL] %s \n\e[0m' "$*"; }
+
  _MOUNTPOINT="${1}"

  _PARAMETER=""
@@ -71,19 +105,6 @@ Verify_checksums() {

  done

-  ### Check GPG pubkey file correct path ---------------------------------------------------------------------------------------
-  for _MP in /lib/live/mount/medium /run/live/medium /cdrom /; do
-
-    if [ -e "${_MP}/0030-verify-checksums.gpg" ]; then
-
-      _KEYFILE="${_MP}/0030-verify-checksums.gpg"
-
-      break
-
-    fi
-
-  done
-
  ### Check if the function should be skipped ----------------------------------------------------------------------------------
  case "${LIVE_VERIFY_CHECKSUMS}" in

@@ -97,13 +118,33 @@ Verify_checksums() {

  esac

+  ### Check GPG pubkey file correct path ---------------------------------------------------------------------------------------
+  for _MP in /lib/live/mount/medium /run/live/medium /cdrom /; do
+
+    if [ -e "${_MP}/${CDLB_EXP_FPR}.gpg" ]; then
+
+      _KEYFILE="${_MP}/${CDLB_EXP_FPR}.gpg"
+
+      if [ -e "${_MP}/${CDLB_EXP_CA_FPR}.gpg" ]; then
+
+        _CA_KEYFILE="${_MP}/${CDLB_EXP_CA_FPR}.gpg"
+
+      fi
+
+      break
+
+    fi
+
+  done
+
  # shellcheck disable=SC2164
  cd "${_MOUNTPOINT}"

+
  ### CDLB verification of script integrity itself -----------------------------------------------------------------------------
  if [ "${LIVE_VERIFY_CHECKSUMS_SIGNATURES}" = "true" ]; then

-    log_begin_msg "Verifying integrity of: [0030-verify-checksums]"
+    log_begin_msg "Verifying integrity of: [0030-ciss-verify-checksums]"
    printf "\n"

    _CAND=""
@@ -112,7 +153,7 @@ Verify_checksums() {
    CDLB_CMD="/usr/bin/sha512sum"
    CDLB_SHA="sha512"

-    for _CAND in /scripts/live-bottom/0030-verify-checksums /usr/lib/live/boot/0030-verify-checksums; do
+    for _CAND in /scripts/live-bottom/0030-ciss-verify-checksums /usr/lib/live/boot/0030-ciss-verify-checksums; do

      [ -e "${_CAND}" ] && { CDLB_SCRIPT_SELF="${_CAND}"; break; }

@@ -124,38 +165,54 @@ Verify_checksums() {
    CDLB_HASHFILE="${CDLB_SCRIPT_FILE}.${CDLB_SHA}sum.txt"
    CDLB_SIG_FILE="${CDLB_HASHFILE}.sig"

+    _STATUS="$(/usr/bin/gpgv --no-default-keyring --keyring "${_KEYFILE}" --status-fd 1 --verify "${CDLB_SIG_FILE}" "${CDLB_SCRIPT_FULL}" 2>/dev/null)"

-    printf "\e[95m[INFO] Verifying integrity of: [%s] ... \n\e[0m" "${CDLB_SCRIPT_FULL}"
+    _CDLB_SIG_FILE_FPR="$(printf '%s\n' "${_STATUS}" | awk '/^\[GNUPG:\] VALIDSIG /{print $3; exit}')"

-    printf "\e[95m[INFO] Verifying signature of: [%s] ... \n\e[0m" "${CDLB_SIG_FILE}"
+    ### Compare against pinned and expected fingerprint.
+    if [ "${_CDLB_SIG_FILE_FPR}" = "${CDLB_EXP_FPR}" ]; then

-    if ! /usr/bin/gpgv --keyring "${_KEYFILE}" --status-fd 1 "${CDLB_SIG_FILE}" "${CDLB_HASHFILE}"; then
-
-      printf "\e[91m[FATAL] Verifying signature of: [%s] failed. \n\e[0m" "${CDLB_SIG_FILE}"
-      sleep 16
-      panic        "[FATAL] Verifying signature of: [${CDLB_SIG_FILE}] failed."
+      log_ok "Signature FPR valid: got: [${_CDLB_SIG_FILE_FPR}] expected: [${CDLB_EXP_FPR}]"

    else

-      printf "\e[92m[INFO] Verifying signature of: [%s] successful. \n\e[0m" "${CDLB_SIG_FILE}"
+      log_er "Signature FPR mismatch: got: [${_CDLB_SIG_FILE_FPR}] expected: [${CDLB_EXP_FPR}]"
+      sleep 8
+      panic "[FATAL] Signature FPR mismatch: got: [${_CDLB_SIG_FILE_FPR}] expected: [${CDLB_EXP_FPR}]."

    fi

-    printf "\e[95m[INFO] Recomputing hash for: [%s] ... \n\e[0m" "${CDLB_SHA}"
+    ### Script self-integrity and authenticity checks --------------------------------------------------------------------------
+    ### Assumption: initramfs itself is not altered.
+    log_in "Verifying signature of: [${CDLB_SIG_FILE}] ..."
+
+    if ! /usr/bin/gpgv --keyring "${_KEYFILE}" --status-fd 1 "${CDLB_SIG_FILE}" "${CDLB_HASHFILE}"; then
+
+      log_er "Verifying signature of: [${CDLB_SIG_FILE}] failed."
+      sleep 8
+      panic  "[FATAL] Verifying signature of: [${CDLB_SIG_FILE}] failed."
+
+    else
+
+      log_ok "Verifying signature of: [${CDLB_SIG_FILE}] successful."
+
+    fi
+
+    log_in "Recomputing hash for: [${CDLB_SHA}] ..."

    CDLB_COMPUTED=$("${CDLB_CMD}" "${CDLB_SCRIPT_FULL}" | { read -r first _ || exit 1; printf '%s\n' "${first}"; })
    IFS=' ' read -r CDLB_EXPECTED _ < "${CDLB_HASHFILE}"

    if [ "${CDLB_COMPUTED}" != "${CDLB_EXPECTED}" ]; then

-      printf "\e[91m[FATAL] Recomputing hash for: [%s] failed. \n\e[0m" "${CDLB_SHA}"
-      sleep 16
-      panic        "[FATAL] Recomputing hash for: [${CDLB_SHA}] failed."
+      log_er "Recomputing hash for: [${CDLB_SHA}] failed."
+      sleep 8
+      panic  "[FATAL] Recomputing hash for: [${CDLB_SHA}] failed."

    fi

-    printf "\e[92m[INFO] Recomputing hash for: [%s] successful. \n\e[0m" "${CDLB_SHA}"
-    printf "\e[92m[INFO] Verification of authenticity and integrity of [%s] successfully completed. \n\e[0m" "${CDLB_SCRIPT_FULL}"
+    log_ok "Recomputing hash for: [${CDLB_SHA}] successful."
+    log_ok "Verification of authenticity and integrity of [${CDLB_SCRIPT_FULL}] successfully completed."
    log_end_msg
    printf "\n"

@@ -164,7 +221,7 @@ Verify_checksums() {
  ### Checksum and checksum signature verification -----------------------------------------------------------------------------
  log_begin_msg "Verifying checksums"
  printf "\n"
-  printf "\e[95m[INFO] Verifying checksums ... \n\e[0m"
+  log_in "Verifying checksums ..."

  # shellcheck disable=SC2001
  for _DIGEST in $(echo "${LIVE_VERIFY_CHECKSUMS_DIGESTS}" | sed -e 's|,| |g'); do
@@ -176,27 +233,27 @@ Verify_checksums() {

      if [ -e "${_CHECKSUM}" ]; then

-        printf "\e[95m[INFO] Found: [%s] ... \n\e[0m" "${_CHECKSUM}"
+        log_in "Found: [${_CHECKSUM}] ..."

        if [ -e "/usr/bin/${_DIGEST}sum" ]; then

-          printf "\e[95m[INFO] Found: [%s] ... \n\e[0m" "/usr/bin/${_DIGEST}sum"
+          log_in "Found: [/usr/bin/${_DIGEST}sum] ..."

          if [ "${LIVE_VERIFY_CHECKSUMS_SIGNATURES}" = "true" ]; then

-            printf "\e[95m[INFO] Checking signature of: [%s] ... \n\e[0m" "${_CHECKSUM}"
+            log_in "Checking signature of: [${_CHECKSUM}] ..."

            _CHECKSUM_SIGNATURE="${_CHECKSUM}.sig"

            if /usr/bin/gpgv --keyring "${_KEYFILE}" --status-fd 1 "${_CHECKSUM_SIGNATURE}" "${_CHECKSUM}"; then

              _RETURN_PGP="${?}"
-              printf "\e[92m[INFO] Checking signature of: [%s] successful. \n\e[0m" "${_CHECKSUM}"
+              log_in "Checking signature of: [${_CHECKSUM}] successful."

            else

              _RETURN_PGP="${?}"
-              printf "\e[91m[FATAL] Checking signature of: [%s] failed. \n\e[0m" "${_CHECKSUM}"
+              log_er "Checking signature of: [${_CHECKSUM}] failed."

            fi

@@ -210,12 +267,12 @@ Verify_checksums() {
          if grep -v '^#' "${_CHECKSUM}" | /usr/bin/"${_DIGEST}"sum -c > "${_TTY}"; then

            _RETURN_SHA="${?}"
-            printf "\e[92m[INFO] Found: [%s] successful verified: [%s] \n\e[0m" "/usr/bin/${_DIGEST}sum" "${_CHECKSUM}"
+            log_ok "Found: [/usr/bin/${_DIGEST}sum] successful verified: [${_CHECKSUM}]"

          else

            _RETURN_SHA="${?}"
-            printf "\e[91m[FATAL] Found: [%s] unsuccessful verified: [%s] \n\e[0m" "/usr/bin/${_DIGEST}sum" "${_CHECKSUM}"
+            log_er "Found: [/usr/bin/${_DIGEST}sum] unsuccessful verified: [${_CHECKSUM}]"

          fi

@@ -225,7 +282,7 @@ Verify_checksums() {
        else

          _RETURN_SHA="255"
-          printf "\e[93m[WARN] NOT Found [%s]. \n\e[0m" "/usr/bin/${_DIGEST}sum"
+          log_er "NOT Found [/usr/bin/${_DIGEST}sum]."

        fi

@@ -241,40 +298,35 @@ Verify_checksums() {
  case "${_RETURN_PGP},${_RETURN_SHA}" in

    "0,0")
-      printf "\e[92m[INFO] Verification of [GPG signature] and [sha checksum] file successful; continuing booting in 8 seconds. \n\e[0m"
-      printf "\e[92m[INFO] CDLB modified: [%s] done. \n\e[0m" "${CDLB_SCRIPT_FULL}"
-      sleep 8
+      log_ok "Verification of [GPG signature] and [sha checksum] file successful; continuing booting in 8 seconds."
      log_success_msg "Verification of [GPG signature] and [sha checksum] file successful; continuing booting in 8 seconds."
+      sleep 8
      return 0
      ;;

    "na,0")
-      printf "\e[92m[INFO] Verification of [sha checksum] file successful; continuing booting in 8 seconds. \n\e[0m"
-      printf "\e[92m[INFO] CDLB modified: [%s] done. \n\e[0m" "${CDLB_SCRIPT_FULL}"
-      sleep 8
+      log_ok "Verification of [sha checksum] file successful; continuing booting in 8 seconds."
      log_success_msg "Verification of [sha checksum] file successful; continuing booting in 8 seconds."
+      sleep 8
      return 0
      ;;

    "0,"*)
-      printf "\e[91m[FATAL] Verification of [GPG signature] file successful, while verification of [sha checksum] file failed. \n\e[0m"
-      printf "\e[91m[FATAL] CDLB modified: [%s] done. \n\e[0m" "${CDLB_SCRIPT_FULL}"
+      log_er "Verification of [GPG signature] file successful, while verification of [sha checksum] file failed."
      sleep 8
-      panic "Verification of [GPG signature] file successful, while verification of [sha checksum] file failed."
+      panic  "Verification of [GPG signature] file successful, while verification of [sha checksum] file failed."
      ;;

    *",0")
-      printf "\e[91m[FATAL] Verification of [GPG signature] file failed, while verification of [sha checksum] file successful. \n\e[0m"
-      printf "\e[91m[FATAL] CDLB modified: [%s] done. \n\e[0m" "${CDLB_SCRIPT_FULL}"
+      log_er "Verification of [GPG signature] file failed, while verification of [sha checksum] file successful."
      sleep 8
-      panic "Verification of [GPG signature] file failed, while verification of [sha checksum] file successful."
+      panic  "Verification of [GPG signature] file failed, while verification of [sha checksum] file successful."
      ;;

    "na,"*)
-      printf "\e[91m[FATAL] Verification of [sha checksum] file failed. \n\e[0m"
-      printf "\e[91m[FATAL] CDLB modified: [%s] done. \n\e[0m" "${CDLB_SCRIPT_FULL}"
+      log_er "Verification of [sha checksum] file failed."
      sleep 8
-      panic "Verification of checksum file failed."
+      panic  "Verification of [sha checksum] file failed."
      ;;

  esac
--- a/config/includes.chroot/usr/lib/live/boot/0042-ciss-post-decrypt-attest
+++ b/config/includes.chroot/usr/lib/live/boot/0042-ciss-post-decrypt-attest
@@ -0,0 +1,194 @@
+#!/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: Late rootfs attestation and dmsetup health checking.
+# Phase  : bottom (executed by live-boot inside the initramfs).
+
+set -eu
+
+### Phase gate: run only in the intended live-boot phase -----------------------------------------------------------------------
+PHASE="${1:-}"
+
+case "${PHASE}" in
+
+  bottom)
+    ;;      ### Continue.
+  *)
+    exit 0  ### Do nothing in other phases.
+    ;;
+
+esac
+
+printf "\e[95m[INFO] Starting: [/usr/lib/live/boot/0042-ciss-post-decrypt-attest] ... \n\e[0m"
+
+### Declare variables ----------------------------------------------------------------------------------------------------------
+
+### Will be replaced at build time:
+export CDLB_EXP_FPR="@EXP_FPR@"
+export CDLB_EXP_CA_FPR="@EXP_CA_FPR@"
+
+### Name of the top-level dm-crypt mapping (e.g., cryptsetup --label): zzzz_ciss_crypt_squash.hook.binary ----------------------
+CDLB_MAPPER_NAME="${CDLB_MAPPER_NAME:-ciss_rootfs.crypt}"
+
+### Attestation file locations inside decrypted rootfs. ------------------------------------------------------------------------
+CDLB_ATTEST_FPR_SHA="${CDLB_ATTEST_FPR_SHA:-/.ciss/attest/${CDLB_EXP_FPR}.sha512sum.txt}"
+CDLB_ATTEST_FPR_SIG="${CDLB_ATTEST_FPR_SIG:-/.ciss/attest/${CDLB_EXP_FPR}.sha512sum.txt.sig}"
+CDLB_KEY_DIR="${CDLB_KEY_DIR:-/etc/ciss/keys}"
+
+### Declare functions ----------------------------------------------------------------------------------------------------------
+
+#######################################
+# Helper for colored text output on stdout.
+# Globals:
+#   None
+# Arguments:
+#   *: String to print
+#######################################
+log_in() { printf '\e[95m[INFO]  %s \n\e[0m' "$*"; }
+
+#######################################
+# Helper for colored text output on stdout.
+# Globals:
+#   None
+# Arguments:
+#   *: String to print
+#######################################
+log_ok() { printf '\e[92m[INFO]  %s \n\e[0m' "$*"; }
+
+#######################################
+# Helper for colored text output on stdout.
+# Globals:
+#   None
+# Arguments:
+#   *: String to print
+#######################################
+log_er() { printf '\e[91m[FATAL] %s \n\e[0m' "$*"; }
+
+### Locate decrypted rootfs mount ----------------------------------------------------------------------------------------------
+_mp=""
+ROOTMP=""
+
+for _mp in /run/live/rootfs /run/live/rootfs.squashfs /run/live/overlay /root ; do
+
+  if [ -d "${_mp}" ] && [ -e "${_mp}/etc" ]; then ROOTMP="${_mp}"; break; fi
+
+done
+
+if [ -z "${ROOTMP}" ]; then
+  log_er "No decrypted rootfs mount found."
+  sleep 8
+  # TODO: Remove debug mode
+  # panic "[FATAL] No decrypted rootfs mount found."
+fi
+
+log_ok "Decrypted rootfs at: [${ROOTMP}]"
+
+HASH_FILE="${ROOTMP}${CDLB_ATTEST_FPR_SHA}"
+SIGN_FILE="${ROOTMP}${CDLB_ATTEST_FPR_SIG}"
+KEYFILE="${ROOTMP}${CDLB_KEY_DIR}/${CDLB_EXP_FPR}.gpg"
+
+[ -n "${KEYFILE}" ]   || { log_er "No public key found under: [${ROOTMP}${CDLB_KEY_DIR}/${CDLB_EXP_FPR}.gpg]"; exit 42; }
+[ -s "${HASH_FILE}" ] || { log_er "Attestation data missing: [${HASH_FILE}]"; exit 42; }
+[ -s "${SIGN_FILE}" ] || { log_er "Attestation signature missing: [${SIGN_FILE}]"; exit 42; }
+
+log_in "Verifying rootfs attestation with 'gpgv' and inside LUKS encrypted rootfs pinned GPG FPR."
+_STATUS="$(${GPGV} --no-default-keyring --keyring "${KEYFILE}" --status-fd 1 --verify "${SIGN_FILE}" "${HASH_FILE}" 2>/dev/null)"
+_CDLB_SIG_FILE_FPR="$(printf '%s\n' "${_STATUS}" | awk '/^\[GNUPG:\] VALIDSIG /{print $3; exit}')"
+
+### Compare against pinned and expected fingerprint. ---------------------------------------------------------------------------
+if [ "${_CDLB_SIG_FILE_FPR}" = "${CDLB_EXP_FPR}" ]; then
+
+  log_ok "Signature FPR valid: got: [${_CDLB_SIG_FILE_FPR}] expected: [${CDLB_EXP_FPR}]"
+
+else
+
+  log_er "Signature FPR mismatch: got: [${_CDLB_SIG_FILE_FPR}] expected: [${CDLB_EXP_FPR}]"
+  sleep 8
+  # TODO: Remove debug mode
+  # panic "[FATAL] Signature FPR mismatch: got: [${_CDLB_SIG_FILE_FPR}] expected: [${CDLB_EXP_FPR}]."
+
+fi
+
+### 'dmsetup' health check -----------------------------------------------------------------------------------------------------
+MAP_DEV="/dev/mapper/${CDLB_MAPPER_NAME}"
+if [ -e "${MAP_DEV}" ]; then
+
+  log_in "Checking dmsetup table for ${MAP_DEV}"
+
+  TOP_LINE="$(/usr/sbin/dmsetup table --showkeys "${MAP_DEV}" 2>/dev/null | awk 'NR==1{print; exit}')"
+  if printf '%s\n' "${TOP_LINE}" | grep -q ' crypt '; then
+
+    log_ok "Top layer is 'crypt'."
+
+  else
+
+    log_er "Top layer is NOT 'crypt'."
+    sleep 8
+    # TODO: Remove debug mode
+    # panic "[FATAL] Top layer is NOT 'crypt'."
+
+  fi
+
+  if printf '%s\n' "${TOP_LINE}" | grep -Eq ' xts|aes-xts'; then
+
+    log_ok "Cipher looks like AES-XTS."
+
+  else
+
+    log_er "Cipher does not look like AES-XTS."
+    sleep 8
+    # TODO: Remove debug mode
+    # panic "[FATAL] Cipher does not look like AES-XTS."
+
+  fi
+
+### Extract child device token (the second last field is 'device', the last is 'offset.') --------------------------------------
+CHILD_TOK="$(printf '%s\n' "${TOP_LINE}" | awk '{print $(NF-1)}')"
+CHILD_NAME="${CHILD_TOK}"
+
+case "${CHILD_TOK}" in
+
+  *:* )
+    if [ -e "/sys/dev/block/${CHILD_TOK}/dm/name" ]; then
+      CHILD_NAME="$(cat "/sys/dev/block/${CHILD_TOK}/dm/name" 2>/dev/null || true)"
+      [ -n "${CHILD_NAME}" ] || CHILD_NAME="${CHILD_TOK}"
+    fi
+    ;;
+
+  /dev/* )
+    CHILD_NAME="$(basename -- "${CHILD_TOK}")"
+    ;;
+
+esac
+
+#### Child layer must be 'integrity' with hmac and sha512 and 4096-byte sectors (best-effort greps). ---------------------------
+log_in "Checking underlying integrity target: ${CHILD_NAME}"
+
+CHILD_TAB="$(/usr/sbin/dmsetup table --showkeys "${CHILD_NAME}" 2>/dev/null || true)"
+printf '%s\n' "${CHILD_TAB}" | grep -q ' integrity ' || { log_er "Underlying layer is not 'integrity'"; }
+printf '%s\n' "${CHILD_TAB}" | grep -qi 'hmac'       || { log_er "Integrity target not using keyed MAC (hmac)"; }
+printf '%s\n' "${CHILD_TAB}" | grep -qi 'sha512'     || { log_er "Integrity algo not sha512"; }
+printf '%s\n' "${CHILD_TAB}" | grep -Eq '\b4096\b'   || { log_er "Expected 4096-byte sector size not found"; }
+
+log_ok "dm-crypt and dm-integrity(HMAC-SHA512, 4096B) chain looks healthy."
+
+fi
+
+printf "\e[92m[INFO] Successfully applied: [/usr/lib/live/boot/0042-ciss-post-decrypt-attest]\n\e[0m"
+
+exit 0
+
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh