V9.14.026.2026.06.12

Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
V9.14.024.2026.06.11
2026-06-12 04:52:18 +01:00 · 2026-06-11 21:15:37 +01:00 · 2026-06-11 20:39:50 +01:00 · 2026-06-11 20:14:31 +01:00 · 2026-06-11 18:54:19 +01:00 · 2026-06-11 18:13:13 +01:00
68 changed files with 1901 additions and 255 deletions
@@ -46,11 +46,26 @@ Verify_checksums() {

  LIVE_VERIFY_CHECKSUMS_SIGNATURES="false"

+  _CHECKSUM_LOG_DIR="${LIVE_VERIFY_CHECKSUMS_LOG_DIR:-/run}"
+
  _KEYFILE=""

  _MP=""

+  _MANIFEST_FOUND="false"
+
+  _TOOL_FOUND="false"
+
+  _VERIFICATION_EXECUTED="false"
+
+  _VERIFICATION_SUCCEEDED="false"
+
+  _RETURN_PGP=""
+
+  _RETURN_SHA=""
+
  ### Parse commandline arguments ----------------------------------------------------------------------------------------------
+  # shellcheck disable=SC2154
  for _PARAMETER in ${LIVE_BOOT_CMDLINE}; do

    case "${_PARAMETER}" in
@@ -107,6 +122,14 @@ Verify_checksums() {

  done

+  if [ "${LIVE_VERIFY_CHECKSUMS_SIGNATURES}" = "true" ] && [ -z "${_KEYFILE}" ]; then
+
+    printf "\e[91m[FATAL] No pinned GPG key file found while checksum signature verification is enabled. \n\e[0m"
+    sleep 8
+    panic "No pinned GPG key file found while checksum signature verification is enabled."
+
+  fi
+
  # shellcheck disable=SC2164
  cd "${_MOUNTPOINT}"

@@ -203,10 +226,14 @@ Verify_checksums() {

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

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

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

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

          if [ "${LIVE_VERIFY_CHECKSUMS_SIGNATURES}" = "true" ]; then
@@ -234,18 +261,34 @@ Verify_checksums() {
          fi

          # shellcheck disable=SC2312
-          if grep -v '^#' "${_CHECKSUM}" | /usr/bin/"${_DIGEST}"sum -c > "${_TTY}"; then
+          _VERIFICATION_EXECUTED="true"
+          _CHECKSUM_LOG="${_CHECKSUM_LOG_DIR}/ciss-${_DIGEST}sum-check.log"
+          if ! grep -v '^#' "${_CHECKSUM}" | grep -q '[^[:space:]]'; then
+
+            _RETURN_SHA="254"
+            : > "${_CHECKSUM_LOG}"
+            printf "\e[91m[FATAL] Checksum manifest has no checksum entries: [%s] \n\e[0m" "${_CHECKSUM}"
+
+          elif grep -v '^#' "${_CHECKSUM}" | /usr/bin/"${_DIGEST}"sum -c > "${_CHECKSUM_LOG}" 2>&1; then

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

          else

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

          fi

+          if { [ "${_RETURN_PGP}" = "0" ] || [ "${_RETURN_PGP}" = "na" ]; } && [ "${_RETURN_SHA}" = "0" ]; then
+
+            _VERIFICATION_SUCCEEDED="true"
+
+          fi
+
          # Stop after the first verification.
          break 2

@@ -265,6 +308,36 @@ Verify_checksums() {
  log_end_msg
  printf "\n"

+  if [ "${_MANIFEST_FOUND}" != "true" ]; then
+
+    printf "\e[91m[FATAL] No supported checksum manifest found. Checksum verification is fail-closed. \n\e[0m"
+    sleep 8
+    panic "No supported checksum manifest found. Checksum verification is fail-closed."
+
+  fi
+
+  if [ "${_TOOL_FOUND}" != "true" ]; then
+
+    printf "\e[91m[FATAL] Checksum manifest found, but no supported checksum tool is available. Checksum verification is fail-closed. \n\e[0m"
+    sleep 8
+    panic "Checksum manifest found, but no supported checksum tool is available. Checksum verification is fail-closed."
+
+  fi
+
+  if [ "${_VERIFICATION_EXECUTED}" != "true" ]; then
+
+    printf "\e[91m[FATAL] Checksum verification was not executed. Checksum verification is fail-closed. \n\e[0m"
+    sleep 8
+    panic "Checksum verification was not executed. Checksum verification is fail-closed."
+
+  fi
+
+  if [ "${_VERIFICATION_SUCCEEDED}" != "true" ]; then
+
+    printf "\e[91m[FATAL] Checksum verification did not complete successfully. Evaluating fail-closed failure state. \n\e[0m"
+
+  fi
+
  case "${_RETURN_PGP},${_RETURN_SHA}" in

    "0,0")
@@ -304,6 +377,12 @@ Verify_checksums() {
      panic "Verification of checksum file failed."
      ;;

+    *)
+      printf "\e[91m[FATAL] Unknown checksum verification state: [%s,%s]. \n\e[0m" "${_RETURN_PGP:-unset}" "${_RETURN_SHA:-unset}"
+      sleep 8
+      panic "Unknown checksum verification state. Checksum verification is fail-closed."
+      ;;
+
  esac
 }
 # vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 name: 🔐 Generating a Private Live ISO TRIXIE.

@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 name: 🔐 Generating a Private Live ISO TRIXIE.

@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 name: 💙 Generating a PUBLIC Live ISO.

@@ -25,7 +25,7 @@ body:
    attributes:
      label: "Version"
      description: "Which version are you running? Use `./ciss_live_builder.sh -v`."
-      placeholder: "e.g., Master V9.14.022.2026.06.10"
+      placeholder: "e.g., Master V9.14.026.2026.06.12"
    validations:
      required: true

@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 FROM debian:bookworm

@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 name: 🔁 Render README.md to README.html.

@@ -11,5 +11,5 @@

 build:
  counter: 1023
-  version: V9.14.022.2026.06.10
+  version: V9.14.026.2026.06.12
 # vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=yaml
@@ -11,5 +11,5 @@

 build:
  counter: 1023
-  version: V9.14.022.2026.06.10
+  version: V9.14.026.2026.06.12
 # vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=yaml
@@ -11,5 +11,5 @@

 build:
  counter: 1023
-  version: V9.14.022.2026.06.10
+  version: V9.14.026.2026.06.12
 # vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=yaml
@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 name: 🔐 Generating a Private Live ISO TRIXIE.

@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 name: 🔐 Generating a Private Live ISO TRIXIE.

@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 name: 💙 Generating a PUBLIC Live ISO.

@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 # Gitea Workflow: Shell-Script Linting
 #
@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 name: 🛡️ Retrieve DNSSEC status of coresecret.dev.

@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 name: 🔁 Render Graphviz Diagrams.

@@ -15,5 +15,5 @@ properties_SPDX-License-Identifier="LicenseRef-CNCL-1.1 OR LicenseRef-CCLA-1.1 "
 properties_SPDX-LicenseComment="This file is part of the CISS.debian.installer.secure framework."
 properties_SPDX-PackageName="CISS.debian.live.builder"
 properties_SPDX-Security-Contact="security@coresecret.eu"
-properties_version="V9.14.022.2026.06.10"
+properties_version="V9.14.026.2026.06.12"
 # vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=conf
@@ -6,7 +6,7 @@ Creator: Person: Marc S. Weidner (Centurion Intelligence Consulting Agency)
 Created: 2025-05-07T12:00:00Z
 Package: CISS.debian.live.builder
 PackageName: CISS.debian.live.builder
-PackageVersion: Master V9.14.022.2026.06.10
+PackageVersion: Master V9.14.026.2026.06.12
 PackageSupplier: Organization: Centurion Intelligence Consulting Agency
 PackageDownloadLocation: https://git.coresecret.dev/msw/CISS.debian.live.builder
 PackageHomePage: https://git.coresecret.dev/msw/CISS.debian.live.builder
@@ -2,7 +2,7 @@
 gitea: none
 include_toc: true
 ---
-[![Static Badge](https://badges.coresecret.dev/badge/Release-V9.14.022.2026.06.10-white?style=plastic&logo=linux&logoColor=white&logoSize=auto&label=Release&color=%23FCC624)](https://git.coresecret.dev/msw/CISS.debian.live.builder)
+[![Static Badge](https://badges.coresecret.dev/badge/Release-V9.14.026.2026.06.12-white?style=plastic&logo=linux&logoColor=white&logoSize=auto&label=Release&color=%23FCC624)](https://git.coresecret.dev/msw/CISS.debian.live.builder)
 &nbsp;
 [![Static Badge](https://badges.coresecret.dev/badge/Licence-EUPL1.2-white?style=plastic&logo=europeanunion&logoColor=white&logoSize=auto&label=Licence&color=%23003399)](https://eupl.eu/1.2/en/) &nbsp;
 [![Static Badge](https://badges.coresecret.dev/badge/opensourceinitiative-Compliant-white?style=plastic&logo=opensourceinitiative&logoColor=white&logoSize=auto&label=OSI&color=%233DA639)](https://opensource.org/license/eupl-1-2) &nbsp;
@@ -27,7 +27,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 **CISS.debian.live.builder — First of its own.**<br>
 **World-class CIA: Designed, handcrafted, and powered by Centurion Intelligence Consulting Agency.**
@@ -46,9 +46,10 @@ Beyond a conventional live system, **CISS.debian.live.builder** assembles a **fu
 in a single, deterministic build step: a LUKS2 container backed by `dm-integrity` hosting the SquashFS root filesystem, combined
 with a hardened initramfs chain including a dedicated Dropbear build pipeline for remote LUKS unlock. The resulting ISO ships
 with a hardened kernel configuration, strict sysctl and network tuning, pre-configured SSH hardening and fail2ban, and a
-customised `verify-checksums` path providing both ISO-edge verification and runtime attestation of the live root. All components
-are aligned with the `CISS.debian.installer` baseline, ensuring a unified cryptographic and security posture from first boot to 
-an installed system. For an overview of the entire build process, see:
+customised `verify-checksums` path providing fail-closed mounted-medium verification plus runtime attestation of the exact
+final SquashFS payload bytes selected for the encrypted live root. All components are aligned with the `CISS.debian.installer`
+baseline, ensuring a unified cryptographic and security posture from first boot to an installed system. For an overview of the
+entire build process, see:
 **[MAN_CISS_ISO_BOOT_CHAIN.md](docs/MAN_CISS_ISO_BOOT_CHAIN.md)**

 When built with the ``--dhcp-centurion`` profile, the live system ships with a strict network and resolver policy: 
@@ -60,12 +61,17 @@ and spoofing surfaces.

 Internally, the builder employs a dedicated secret-handling pipeline backed by a tmpfs-only secrets directory
 (`/dev/shm/cdlb_secrets`). Sensitive material such as root passwords, SSH keys, and signing keys never appears on the command
-line, is guarded by strict `0400 root:root` permissions, and any symlink inside the secret path is treated as a hard failure
-that aborts the run. Critical code paths temporarily disable Bash xtrace so that credentials never leak into debug logs, and
-transient secret files are shredded (`shred -fzu`) as soon as they are no longer needed. GNUPG homes used for signing are
-wiped, unencrypted chroot artifacts and includes are removed after `lb build`, and the final artifact is reduced to the
-encrypted SquashFS inside the LUKS2 container. At runtime, LUKS passphrases in the live ISO and installer are transported via
-named pipes inside the initramfs instead of process arguments, further minimizing exposure in process listings.
+line. The secret root must be an existing `root:root` tmpfs or ramfs directory with `0700` permissions and no symlinks or
+special files below it. Filename-only secret arguments are rejected when they contain path separators, traversal names, shell
+metacharacters, or unsafe leading dashes. Critical code paths temporarily disable Bash xtrace so that credentials never leak
+into debug logs; the final exact-value sanitization pass runs only after xtrace has been stopped and its debug file descriptor
+has been closed, then redacts still-known secret values from debug, variable, and error logs as defense in depth. Transient
+secret files are shredded (`shred -fzu`) as soon as they are no longer needed; this is best-effort on SSD/NVMe media, so the
+architecture relies primarily on tmpfs for secret staging. GNUPG homes used for signing are wiped,
+unencrypted chroot artifacts and includes are removed after `lb build`, and cleanup is intentionally destructive only inside
+the exact build directory carrying the `.ciss-live-builder-owned` marker. At runtime, LUKS passphrases in the live ISO and
+installer are transported via named pipes inside the initramfs instead of process arguments, further minimizing exposure in
+process listings.

 Check out more leading world-class services powered by Centurion Intelligence Consulting Agency:
 * [CenturionDNS Resolver](https://eddns.eu/)
@@ -123,7 +129,7 @@ lockstep avoids those mismatches and gives me predictable artifacts across build

 The live ISO acts as a sealed, immutable execution environment. All relevant configuration, all installation logic, and all 
 security decisions are rendered into the image at build time and treated as read-only at runtime. On top of that logical 
- immutability, I now layer cryptographic protection of the live root file system itself. The live image contains a LUKS2 container
+immutability, I now layer cryptographic protection of the live root file system itself. The live image contains a LUKS2 container
 file with dm-integrity that wraps the SquashFS payload. The initramfs knows how to locate this container, unlock it, verify its 
 integrity, and then present the decrypted SquashFS as the root component of an OverlayFS stack. The detailed boot and 
 verification chain is documented separately in **[CISS ISO Boot Chain](docs/MAN_CISS_ISO_BOOT_CHAIN.md)**<br>
@@ -131,7 +137,7 @@ verification chain is documented separately in **[CISS ISO Boot Chain](docs/MAN_
 In compact form, my expectations for the system are:<br>

 * Every bit that matters for boot and provisioning is covered by checksums that I control and that are signed with keys under my solely authoritative HSM.
-* The live root runs out of a LUKS2 dm-integrity container so that a tampered or bit-rotted SquashFS never becomes a trusted root.
+* The live root runs out of a LUKS2 dm-integrity container, and the final SquashFS byte stream copied into the decrypted mapper is verified against a signed rootfs attestation manifest, so a tampered or bit-rotted SquashFS never becomes a trusted root.
 * Verification steps are not advisory. Any anomaly causes a hard abort during boot.
 * After the live environment has reached a stable, verified state, it can hand off to ``CISS.debian.installer``. The installer operates from the same image, does not pull random payloads from the internet, and keeps the target system behind a hardened firewall until the entire provisioning process has completed.
 * For unattended, headless scenarios I also support builds where the target system is installed without ever exposing a shell over the console. After installation and reboot, the machine waits for a decryption passphrase via an embedded Dropbear SSH instance in the initramfs, limited to public key authentication and guarded by strict cryptographic policies. In such variants even ``/boot`` can be encrypted, with GRUB taking care of unlocking the boot partition.
@@ -175,7 +181,7 @@ installer toolchain.

 This project adheres strictly to a structured versioning scheme following the pattern x.y.z-Date.

-Example: `V9.14.022.2026.06.10`
+Example: `V9.14.026.2026.06.12`

 `x.y.z` represents major (x), minor (y), and patch (z) version increments.

@@ -369,7 +375,7 @@ For further details see: **[90-ciss-local.hardened.md](docs/documentation/90-cis
  `--primordial-ssh <port>` configure the CDI Primordial overlay clone. `--primordial-ssh` also adds an outgoing-only UFW TCP
  exception for a bootstrap/recovery SSH port when the live system's UFW outgoing policy is `deny`. It adds no incoming firewall
  rule and does not replace `--ssh-port`. If the requested port already matches an existing outgoing SSH exception, the current
-  hook still emits the requested labelled rule because this repository has no separate UFW rule deduplication layer.
+  hook still emits the requested labeled rule because this repository has no separate UFW rule deduplication layer.
 * **Rationale**: Implements a default-deny firewall, reducing lateral movement and data exfiltration risks immediately after
  deployment.

@@ -493,10 +499,13 @@ To use **``CISS.debian.live.builder``** as intended, the following baseline is e
   
 2. Preparation:
   1. Ensure you are root.
-   2. Create the build directory `mkdir /opt/cdlb` and the tmpfs secrets directory `mkdir /dev/shm/cdlb_secrets`.
+   2. Create the build directory `install -d -m 0755 -o root -g root /opt/cdlb` and the tmpfs secrets directory
+      `install -d -m 0700 -o root -g root /dev/shm/cdlb_secrets`.
   3. Place your desired SSH public key in the `authorized_keys` file, for example, in the `/dev/shm/cdlb_secrets` directory.
   4. Place your desired Password in the `password.txt` file, for example, in the `/dev/shm/cdlb_secrets` directory.
-   5. Make any other changes you need to.
+   5. Keep files below `/dev/shm/cdlb_secrets` as regular, non-symlink files owned by `root:root`; the builder normalizes them
+      to `0400` before use.
+   6. Make any other changes you need to.

 3. Run the config builder script `./ciss_live_builder.sh` and the integrated `lb build` command (example):

@@ -505,7 +514,7 @@ To use **``CISS.debian.live.builder``** as intended, the following baseline is e
   timestamp=$(date -u +%Y-%m-%dT%H:%M:%S%z)
   ./ciss_live_builder.sh \
     --architecture amd64 \
-     --autobuild=6.16.3+deb13-amd64 \
+     --autobuild=7.0.10+deb13-amd64 \
     --build-directory /opt/cdlb \
     --cdi \
     --change-splash hexagon \
@@ -525,9 +534,9 @@ To use **``CISS.debian.live.builder``** as intended, the following baseline is e
     --signing_key_pass=signing_key_pass.txt \
     --signing_key=signing_key.asc \
     --ssh-port 4242 \
-     --primordial-url https://git.coresecret.dev/ahz/PhysNet.primordial.git \
-     --primordial-key id--git.coresecret.dev--PhysNet.primordial_deploy--ed25519--newton--2025-10 \
-     --primordial-ssh 42842 \
+     --primordial-key SSH-key-filename-for-Primordial-overlay-clone \
+     --primordial-ssh SSH-port-for-Primordial-overlay-clone \
+     --primordial-url URL-to-Primordial-overlay-clone \
     --ssh-pubkey /dev/shm/cdlb_secrets \
     --sshfp \
     --trixie
@@ -559,10 +568,13 @@ preview it or run it.

 2. Preparation:
   1. Ensure you are root.
-   2. Create the build directory `mkdir /opt/cdlb` and the tmpfs secrets directory `mkdir /dev/shm/cdlb_secrets`.
+   2. Create the build directory `install -d -m 0755 -o root -g root /opt/cdlb` and the tmpfs secrets directory
+      `install -d -m 0700 -o root -g root /dev/shm/cdlb_secrets`.
   3. Place your desired SSH public key in the `authorized_keys` file, for example, in the `/dev/shm/cdlb_secrets` directory.
   4. Place your desired Password in the `password.txt` file, for example, in the `/dev/shm/cdlb_secrets` directory.
-   5. Copy and edit the sample and set your options (no spaces around commas in lists): 
+   5. Keep files below `/dev/shm/cdlb_secrets` as regular, non-symlink files owned by `root:root`; the builder normalizes them
+      to `0400` before use.
+   6. Copy and edit the sample and set your options (no spaces around commas in lists):

    ````bash
    cp config.mk.sample config.mk
@@ -577,9 +589,9 @@ preview it or run it.
    SSH_PUBKEY=/dev/shm/cdlb_secrets

    # Optional
-    PRIMORDIAL_URL=https://git.coresecret.dev/ahz/PhysNet.primordial.git
-    PRIMORDIAL_KEY=id--git.coresecret.dev--PhysNet.primordial_deploy--ed25519--newton--2025-10
-    PRIMORDIAL_SSH_PORT=42842
+    PRIMORDIAL_KEY=SSH-key-filename-for-Primordial-overlay-clone
+    PRIMORDIAL_SSH_PORT=SSH-port-for-Primordial-overlay-clone
+    PRIMORDIAL_URL=URL-to-Primordial-overlay-clone
    PROVIDER_NETCUP_IPV6=2001:cdb::1
    # comma-separated; IPv6 in [] is fine
    JUMP_HOSTS=[2001:db8::1],[2001:db8::2]     
@@ -8,13 +8,13 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. Repository Structure

 **Project:** Centurion Intelligence Consulting Agency Information Security Standard (CISS) — Debian Live Builder  
 **Branch:** `master`  
-**Repository State:** Master Version **9.14**, Build **V9.14.022.2026.06.10** (as of 2025-10-11)
+**Repository State:** Master Version **9.14**, Build **V9.14.026.2026.06.12** (as of 2025-10-11)

 ## 3.1. Top-Level Layout

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. CISS Secure Boot Private Material

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. CISS Secure Boot Public Material

@@ -41,6 +41,8 @@ declare -grx  VAR_SETUP_PATH="$(cd "$(dirname "${0}")" && pwd)"          # '/roo
 declare -grx  VAR_TMP_SECRET="/dev/shm/cdlb_secrets"                     # Fixed tmpfs path to store securely build artifacts.
 declare -grx  VAR_WORKDIR="$(dirname "${VAR_SETUP_FULL}")"               # '/root/git/CISS.debian.live.builder'

+clear
+
 ### PRELIMINARY CHECKS.
 ### No ash, dash, ksh, sh.
 # shellcheck disable=SC2292
@@ -116,7 +118,6 @@ for arg in "$@"; do case "${arg,,}" in -v|--version) . ./lib/lib_version.sh   ;
 for arg in "$@"; do case "${arg,,}" in -d|--debug)   . ./meta_sources_debug.sh; debugger "${@}";; esac; done

 ### ALL CHECKS DONE. READY TO START THE SCRIPT.
-clear
 printf '\033[95m'
 cat bootscreen.txt
 printf '\033[0m\n'
@@ -143,6 +144,7 @@ find "${VAR_TMP_SECRET}" -type f -exec chown root:root {} +
 [[ "${VAR_SETUP}" == true ]] && {
  source_guard "./lib/lib_arg_parser.sh"
  source_guard "./lib/lib_arg_priority_check.sh"
+  source_guard "./lib/lib_build_dir_safety.sh"
  source_guard "./lib/lib_boot_screen.sh"
  source_guard "./lib/lib_cdi.sh"
  source_guard "./lib/lib_change_splash.sh"
@@ -160,6 +162,7 @@ find "${VAR_TMP_SECRET}" -type f -exec chown root:root {} +
  source_guard "./lib/lib_clean_screen.sh"
  source_guard "./lib/lib_clean_up.sh"
  source_guard "./lib/lib_copy_integrity.sh"
+  source_guard "./lib/lib_debug_sanitize.sh"
  source_guard "./lib/lib_gnupg.sh"
  source_guard "./lib/lib_hardening_root_pw.sh"
  source_guard "./lib/lib_hardening_ssh_tcp.sh"
@@ -173,6 +176,7 @@ find "${VAR_TMP_SECRET}" -type f -exec chown root:root {} +
  source_guard "./lib/lib_provider_netcup.sh"
  source_guard "./lib/lib_run_analysis.sh"
  source_guard "./lib/lib_sanitizer.sh"
+  source_guard "./lib/lib_secret_validation.sh"
  source_guard "./lib/lib_secureboot_profile.sh"
  source_guard "./lib/lib_trap_on_err.sh"
  source_guard "./lib/lib_trap_on_exit.sh"
@@ -180,22 +184,6 @@ find "${VAR_TMP_SECRET}" -type f -exec chown root:root {} +
  source_guard "./lib/lib_usage.sh"
 }

-### PRE-SCAN SECURE BOOT PROFILE FOR BUILD-HOST PACKAGE CHECKS.
-### Formal validation still happens in arg_parser().
-for ((idx=0; idx<${#ARY_PARAM_ARRAY[@]}; idx++)); do
-  case "${ARY_PARAM_ARRAY[idx],,}" in
-    --secure-boot-profile=*)
-      declare -gx VAR_CISS_SECUREBOOT_PROFILE="${ARY_PARAM_ARRAY[idx]#*=}"
-      ;;
-    --secure-boot-profile)
-      if [[ -n "${ARY_PARAM_ARRAY[idx + 1]:-}" ]]; then
-        declare -gx VAR_CISS_SECUREBOOT_PROFILE="${ARY_PARAM_ARRAY[idx + 1]}"
-      fi
-      ;;
-  esac
-done
-unset idx
-
 ### CHECKING REQUIRED PACKAGES.
 check_pkgs

@@ -221,9 +209,30 @@ if ! ${VAR_HANDLER_AUTOBUILD}; then boot_screen; fi
 if ! ${VAR_HANDLER_AUTOBUILD}; then printf "XXX\nInitialization done ... \nXXX\n15\n" >&3; fi

 ### Updating Status of Dialog Gauge Bar.
-if ! ${VAR_HANDLER_AUTOBUILD}; then printf "XXX\nActivate traps ... \nXXX\n50\n" >&3; fi
+if ! ${VAR_HANDLER_AUTOBUILD}; then printf "XXX\nValidating secrets artifacts ... \nXXX\n20\n" >&3; fi
+validate_secret_root "${VAR_TMP_SECRET}"
+harden_secret_root_files "${VAR_TMP_SECRET}"

-### Following the CISS Bash naming and ordering scheme:
+### Updating Status of Dialog Gauge Bar.
+if ! ${VAR_HANDLER_AUTOBUILD}; then printf "XXX\nPre-Scan Secure-Boot ... \nXXX\n30\n" >&3; fi
+### PRE-SCAN SECURE BOOT PROFILE FOR BUILD-HOST PACKAGE CHECKS.
+### Formal validation still happens in arg_parser().
+for ((idx=0; idx<${#ARY_PARAM_ARRAY[@]}; idx++)); do
+  case "${ARY_PARAM_ARRAY[idx],,}" in
+    --secure-boot-profile=*)
+      declare -gx VAR_CISS_SECUREBOOT_PROFILE="${ARY_PARAM_ARRAY[idx]#*=}"
+      ;;
+    --secure-boot-profile)
+      if [[ -n "${ARY_PARAM_ARRAY[idx + 1]:-}" ]]; then
+        declare -gx VAR_CISS_SECUREBOOT_PROFILE="${ARY_PARAM_ARRAY[idx + 1]}"
+      fi
+      ;;
+  esac
+done
+unset idx
+
+### Updating Status of Dialog Gauge Bar.
+if ! ${VAR_HANDLER_AUTOBUILD}; then printf "XXX\nTraps active ... \nXXX\n50\n" >&3; fi
 trap 'trap_on_exit "$?" "${BASH_SOURCE[0]}" "${LINENO}" "${FUNCNAME[0]:-main}" "${BASH_COMMAND}"' EXIT
 trap 'trap_on_err  "$?" "${BASH_SOURCE[0]}" "${LINENO}" "${FUNCNAME[0]:-main}" "${BASH_COMMAND}"' ERR

@@ -234,9 +243,13 @@ declare -ar  ARY_ARG_SANITIZED=("$@")
 declare -grx VAR_ARG_SANITIZED="${ARY_ARG_SANITIZED[*]}"

 ### Updating Status of Dialog Gauge Bar.
-if ! ${VAR_HANDLER_AUTOBUILD}; then printf "XXX\nParsing Arguments ... \nXXX\n90\n" >&3; fi
+if ! ${VAR_HANDLER_AUTOBUILD}; then printf "XXX\nParsing Arguments ... \nXXX\n80\n" >&3; fi
 arg_parser "$@"

+### Updating Status of Dialog Gauge Bar.
+if ! ${VAR_HANDLER_AUTOBUILD}; then printf "XXX\nValidate secret Arguments ... \nXXX\n95\n" >&3; fi
+validate_selected_secret_inputs
+
 ### Updating Status of Dialog Gauge Bar.
 if ! ${VAR_HANDLER_AUTOBUILD}; then printf "XXX\nFinal checks ... \nXXX\n95\n" >&3; fi
 clean_ip
@@ -1,4 +1,5 @@
 #!/bin/bash
+# shellcheck disable=SC2154
 # 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
@@ -11,9 +12,10 @@
 # SPDX-Security-Contact: security@coresecret.eu
 set -Ceuo pipefail

-# Final live-build binary hook for encrypted root filesystem packaging. Preallocate a LUKS2 container, formats it with the
-# generated build secret, copies the generated filesystem.squashfs into the opened encrypted mapping, then closes the container,
-# shreds the temporary LUKS secret, and removes the plaintext SquashFS from the ISO payload.
+# Final live-build binary hook for encrypted root filesystem packaging. It creates and signs a deterministic attestation
+# manifest for the final filesystem.squashfs byte stream, preallocates a LUKS2 container, formats it with the generated build
+# secret, copies the generated filesystem.squashfs into the opened encrypted mapping, then closes the container, shreds the
+# temporary LUKS secret, and removes the plaintext SquashFS from the ISO payload.

 printf "\e[95m🧪 '%s' starting ... \e[0m\n" "${0}"

@@ -63,12 +65,105 @@ preallocate() {
 # shellcheck disable=SC2034
 readonly -f preallocate

-declare ROOTFS="${VAR_HANDLER_BUILD_DIR}/binary/live/filesystem.squashfs"
-declare LUKSFS="${VAR_HANDLER_BUILD_DIR}/binary/live/ciss_rootfs.crypt"
-declare KEYFD=""
+#######################################
+# Create and sign the rootfs attestation manifest for the exact SquashFS payload copied into the LUKS mapper.
+# Globals:
+#   VAR_SIGNING_KEY_FPR
+#   VAR_SIGNING_KEY_PASSFILE
+#   VAR_VERIFY_KEYRING
+# Arguments:
+#   1: Final SquashFS payload file
+#   2: Manifest path below binary/live
+# Returns:
+#   0: on success
+#   42: on failure
+#######################################
+create_attestation() {
+  declare rootfs_file="${1}"
+  declare rootfs_attestation="${2}"
+  declare rootfs_hash=""
+  declare rootfs_size=""

+  rootfs_size="$(stat -c%s -- "${rootfs_file}")"
+  rootfs_hash="$(LC_ALL=C sha512sum "${rootfs_file}")"
+  rootfs_hash="${rootfs_hash%% *}"
+
+  if printf '%s  %s\n' "${rootfs_hash}" "${rootfs_file}" | LC_ALL=C sha512sum -c --strict --quiet; then
+
+    printf "\e[92m✅ [LC_ALL=C sha512sum -c --strict --quiet of %s] successful. \e[0m\n" "${rootfs_file}"
+
+  else
+
+    printf "\e[91m❌ [LC_ALL=C sha512sum -c --strict --quiet of %s] NOT successful. \e[0m\n" "${rootfs_file}"
+    return 42
+
+  fi
+
+  # The attested boundary is the final SquashFS byte stream before LUKS wrapping. The boot verifier reads exactly this many
+  # bytes from the decrypted mapper and intentionally excludes the LUKS allocation slack after the SquashFS payload.
+  cat << EOF >| "${rootfs_attestation}"
+# CISS.debian.live.builder Master ${VAR_VERSION}
+# Attestation file for filesystem.squashfs Version 1.0.0
+# Boundary : Final filesystem.squashfs byte stream copied into /dev/mapper/crypt_liveiso
+# Bytes    : Final filesystem.squashfs ${rootfs_size}
+${rootfs_hash}  filesystem.squashfs
+EOF
+
+  chmod 0444 "${rootfs_attestation}"
+
+  if gpg --batch --yes --pinentry-mode loopback --passphrase-file "${VAR_SIGNING_KEY_PASSFILE}" --local-user "${VAR_SIGNING_KEY_FPR}" \
+    --detach-sign --output "${rootfs_attestation}.sig" "${rootfs_attestation}"; then
+
+    printf "\e[92m✅ [gpg of %s] successful. \e[0m\n" "${rootfs_attestation}"
+
+  else
+
+    printf "\e[91m❌ [gpg of %s] NOT successful. \e[0m\n" "${rootfs_attestation}"
+    return 42
+
+  fi
+
+  chmod 0444 "${rootfs_attestation}.sig"
+
+  if gpgv --keyring "${VAR_VERIFY_KEYRING}" "${rootfs_attestation}.sig" "${rootfs_attestation}"; then
+
+    printf "\e[92m✅ [gpgv of %s] successful. \e[0m\n" "${rootfs_attestation}.sig"
+
+  else
+
+    printf "\e[91m❌ [gpgv of %s] NOT successful. \e[0m\n" "${rootfs_attestation}.sig"
+    return 42
+
+  fi
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f create_attestation
+
+declare    LUKSFS="${VAR_HANDLER_BUILD_DIR}/binary/live/ciss_rootfs.crypt"
+declare    ROOTFS="${VAR_HANDLER_BUILD_DIR}/binary/live/filesystem.squashfs"
+declare    ROOTFS_ATTESTATION="${VAR_HANDLER_BUILD_DIR}/binary/live/filesystem.squashfs.sha512sum.txt"
+declare    DM_LAB="crypt_liveiso"
+declare    DEVMAP="/dev/mapper/${DM_LAB}"
+declare    LUKS_KEY_FILE="${VAR_TMP_SECRET}/${VAR_LUKS_KEY:-luks.txt}"
+declare    KEYFD=""
+# Keep Argon2 keyslot memory and parallel costs bounded for later initramfs unlocks on smaller systems.
+declare -i LUKS_PBKDF_MEMORY_KIB=262144
+declare -i LUKS_PBKDF_PARALLEL=1
 # shellcheck disable=SC2155
-declare -i VAR_ROOTFS_SIZE=$(stat -c%s -- "${ROOTFS}")
+declare -i VAR_ROOTFS_SIZE="$(stat -c%s -- "${ROOTFS}")"
+
+### Attestation Boundary
+#   - The attested boundary is the final SquashFS byte stream before LUKS wrapping.
+#   - The boot verifier reads exactly this many bytes from the decrypted mapper and intentionally excludes the LUKS allocation
+#     slack after the SquashFS payload.
+printf "\e[95m🧪 Attestation of filesystem.squashfs ... \e[0m\n"
+
+create_attestation "${ROOTFS}" "${ROOTFS_ATTESTATION}"
+
+printf "\e[92m✅ Attestation of filesystem.squashfs successful. \e[0m\n"

 ### Safety margin:
 #   - LUKS2-Header and Metadata
@@ -82,7 +177,7 @@ declare -i VAR_LUKSFS_SIZE=$(( ( (BASE_SIZE + ALIGN_BYTES - 1) / ALIGN_BYTES ) *

 preallocate "${LUKSFS}" "${VAR_LUKSFS_SIZE}"

-exec {KEYFD}<"${VAR_TMP_SECRET}/luks.txt"
+exec {KEYFD}<"${LUKS_KEY_FILE}"

 if [[ "${VAR_CDLB_INSIDE_RUNNER}" == "false" ]]; then

@@ -93,10 +188,12 @@ if [[ "${VAR_CDLB_INSIDE_RUNNER}" == "false" ]]; then
    --iter-time 1000 \
    --key-file "/proc/$$/fd/${KEYFD}" \
    --key-size 512 \
-    --label crypt_liveiso \
+    --label "${DM_LAB}" \
    --luks2-keyslots-size 16777216 \
    --luks2-metadata-size 4194304 \
    --pbkdf argon2id \
+    --pbkdf-memory "${LUKS_PBKDF_MEMORY_KIB}" \
+    --pbkdf-parallel "${LUKS_PBKDF_PARALLEL}" \
    --sector-size 4096 \
    --type luks2 \
    --use-random \
@@ -108,13 +205,16 @@ elif [[ "${VAR_CDLB_INSIDE_RUNNER}" == "true" ]]; then
  cryptsetup luksFormat \
    --batch-mode \
    --cipher aes-xts-plain64 \
+    --integrity hmac-sha512 \
    --iter-time 1000 \
    --key-file "/proc/$$/fd/${KEYFD}" \
    --key-size 512 \
-    --label crypt_liveiso \
+    --label "${DM_LAB}" \
    --luks2-keyslots-size 16777216 \
    --luks2-metadata-size 4194304 \
    --pbkdf argon2id \
+    --pbkdf-memory "${LUKS_PBKDF_MEMORY_KIB}" \
+    --pbkdf-parallel "${LUKS_PBKDF_PARALLEL}" \
    --sector-size 4096 \
    --type luks2 \
    --use-random \
@@ -123,10 +223,10 @@ elif [[ "${VAR_CDLB_INSIDE_RUNNER}" == "true" ]]; then

 fi

-cryptsetup open --key-file "/proc/$$/fd/${KEYFD}" "${LUKSFS}" crypt_liveiso
+cryptsetup open --key-file "/proc/$$/fd/${KEYFD}" "${LUKSFS}" "${DM_LAB}"

 # shellcheck disable=SC2155
-declare -i LUKS_FREE=$(blockdev --getsize64 /dev/mapper/crypt_liveiso)
+declare -i LUKS_FREE=$(blockdev --getsize64 "${DEVMAP}")
 declare -i SQUASH_FS="${VAR_ROOTFS_SIZE}"

 if (( LUKS_FREE >= SQUASH_FS )); then
@@ -140,13 +240,13 @@ else

 fi

-dd if="${ROOTFS}" of=/dev/mapper/crypt_liveiso bs=8M status=progress conv=fsync
+dd if="${ROOTFS}" of="${DEVMAP}" bs=8M status=progress conv=fsync
 sync
-cryptsetup close crypt_liveiso
+cryptsetup close "${DM_LAB}"

 exec {KEYFD}<&-

-shred -fzu -n 5 -- "${VAR_TMP_SECRET}/luks.txt"
+shred -fzu -n 5 -- "${LUKS_KEY_FILE}"

 rm -f -- "${ROOTFS}"

@@ -123,7 +123,6 @@ if [ -d "${src_dir}" ]; then

 fi

-
 ### Install Dropbear configuration ---------------------------------------------------------------------------------------------
 install -m 0444 /etc/dropbear/initramfs/dropbear.conf "${DESTDIR}/etc/dropbear/dropbear.conf"
 printf "\e[92mSuccessfully executed: [install -m 0444 /etc/dropbear/initramfs/dropbear.conf %s/etc/dropbear/dropbear.conf] \n\e[0m" "${DESTDIR}"
@@ -146,6 +145,13 @@ printf "\e[92mSuccessfully executed: [install -m 0444 /etc/dropbear/initramfs/ba
 install -m 0444 /etc/banner "${DESTDIR}/etc/dropbear/banner"
 printf "\e[92mSuccessfully executed: [install -m 0444 /etc/dropbear/initramfs/banner %s/etc/dropbear/banner] \n\e[0m" "${DESTDIR}"

+### Ensure live-boot runtime scripts in the initramfs are executable -----------------------------------------------------------
+if [ -d "${DESTDIR}/usr/lib/live/boot" ]; then
+
+  find "${DESTDIR}/usr/lib/live/boot" -type f -exec chmod +x -- {} +
+  printf "\e[92mSuccessfully executed: [find %s/usr/lib/live/boot -type f -exec chmod +x -- {} +] \n\e[0m" "${DESTDIR}"
+
+fi
 ### EOS

 printf "\e[92mSuccessfully executed: [/etc/initramfs-tools/hooks/9999_ciss_debian_live_builder.sh] \n\e[0m"
@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 [git.coresecret.dev]:42842 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGQA107AVmg1D/jnyXiqbPf38zQRl8s3c+PM1zbfpeQl
 [git.coresecret.dev]:42842 ssh-rsa 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
@@ -9,7 +9,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 ### 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
@@ -11,7 +11,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-# Version Master V9.14.022.2026.06.10
+# Version Master V9.14.026.2026.06.12

 ### https://docs.kernel.org/
 ### https://github.com/a13xp0p0v/kernel-hardening-checker/
@@ -10,7 +10,7 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

-declare -gr VERSION="Master V9.14.022.2026.06.10"
+declare -gr VERSION="Master V9.14.026.2026.06.12"

 ### VERY EARLY CHECK FOR DEBUGGING
 if [[ $* == *" --debug "* ]]; then
@@ -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 V9.14.022.2026.06.10 at: 10:18:37.9542
+# Written by: ./preseed_hash_generator.sh Version: Master V9.14.026.2026.06.12 at: 10:18:37.9542
@@ -15,12 +15,14 @@
 # SPDX-Security-Contact: security@coresecret.eu

 # Module summary:
-# This live-boot component implements the verify-checksums mode for the mounted live medium.
-# It reads the live-boot command line to decide whether checksum verification is enabled and which digests to accept.
-# It locates the pinned CISS GPG key material on the live medium, optionally verifies this script's signed hash,
-# optionally verifies signed checksum files, and checks the first matching checksum manifest with the matching digest tool. It
-# writes detailed checksum output to the verification TTY. It panics instead of continuing boot when integrity or
-# authenticity verification fails.
+# This live-boot component implements verify-checksums mode for the mounted live medium.
+# It reads the live-boot command line to decide whether checksum verification is enabled, which digests to accept, and
+# whether checksum signature verification is required. When signature verification is enabled, it requires to be pinned CISS GPG
+# key material from the live medium, verifies this script's signed SHA-512 hash, and verifies the selected checksum manifest
+# signature before accepting checksum results. It checks the first supported checksum manifest with an available matching digest
+# tool and writes detailed checksum command output to the verification TTY when checksum execution runs. It fails closed by
+# panicking on missing manifests, missing digest tools, empty manifests, failed signatures, failed checksums, or unknown
+# verification states.

 ### Modified Version of the original file:
 ### https://salsa.debian.org/live-team/live-boot 'components/0030-ciss-verify-checksums'
@@ -87,11 +89,26 @@ Verify_checksums() {

  _CHECKSUM_LOG=""

+  _CHECKSUM_LOG_DIR="${LIVE_VERIFY_CHECKSUMS_LOG_DIR:-/run}"
+
  _KEYFILE=""

+  _MANIFEST_FOUND="false"
+
  _MP=""

+  _RETURN_PGP=""
+
+  _RETURN_SHA=""
+
+  _TOOL_FOUND="false"
+
+  _VERIFICATION_EXECUTED="false"
+
+  _VERIFICATION_SUCCEEDED="false"
+
  ### Parse commandline arguments ----------------------------------------------------------------------------------------------
+  # shellcheck disable=SC2154
  for _PARAMETER in ${LIVE_BOOT_CMDLINE}; do

    case "${_PARAMETER}" in
@@ -148,6 +165,14 @@ Verify_checksums() {

  done

+  if [ "${LIVE_VERIFY_CHECKSUMS_SIGNATURES}" = "true" ] && [ -z "${_KEYFILE}" ]; then
+
+    log_er "No pinned GPG key file found while checksum signature verification is enabled."
+    sleep 8
+    panic  "[FATAL] No pinned GPG key file found while checksum signature verification is enabled."
+
+  fi
+
  # shellcheck disable=SC2164
  cd "${_MOUNTPOINT}"

@@ -244,10 +269,14 @@ Verify_checksums() {

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

+        _MANIFEST_FOUND="true"
+
        log_in "Found: [${_CHECKSUM}] ..."

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

+          _TOOL_FOUND="true"
+
          log_in "Found: [/usr/bin/${_DIGEST}sum] ..."

          if [ "${LIVE_VERIFY_CHECKSUMS_SIGNATURES}" = "true" ]; then
@@ -275,8 +304,15 @@ Verify_checksums() {
          fi

          # shellcheck disable=SC2312
-          _CHECKSUM_LOG="/run/ciss-${_DIGEST}sum-check.log"
-          if grep -v '^#' "${_CHECKSUM}" | LC_ALL=C /usr/bin/"${_DIGEST}"sum -c > "${_CHECKSUM_LOG}" 2>&1; then
+          _CHECKSUM_LOG="${_CHECKSUM_LOG_DIR}/ciss-${_DIGEST}sum-check.log"
+          _VERIFICATION_EXECUTED="true"
+          if ! grep -v '^#' "${_CHECKSUM}" | grep -q '[^[:space:]]'; then
+
+            _RETURN_SHA="254"
+            : > "${_CHECKSUM_LOG}"
+            log_er "Checksum manifest has no checksum entries: [${_CHECKSUM}]"
+
+          elif grep -v '^#' "${_CHECKSUM}" | LC_ALL=C /usr/bin/"${_DIGEST}"sum -c > "${_CHECKSUM_LOG}" 2>&1; then

            _RETURN_SHA="${?}"
            cat "${_CHECKSUM_LOG}" > "${_TTY}"
@@ -294,6 +330,12 @@ Verify_checksums() {

          fi

+          if { [ "${_RETURN_PGP}" = "0" ] || [ "${_RETURN_PGP}" = "na" ]; } && [ "${_RETURN_SHA}" = "0" ]; then
+
+            _VERIFICATION_SUCCEEDED="true"
+
+          fi
+
          # Stop after the first verification.
          break 2

@@ -313,6 +355,36 @@ Verify_checksums() {
  log_end_msg
  printf "\n"

+  if [ "${_MANIFEST_FOUND}" != "true" ]; then
+
+    log_er "No supported checksum manifest found. Checksum verification is fail-closed."
+    sleep 8
+    panic  "[FATAL] No supported checksum manifest found. Checksum verification is fail-closed."
+
+  fi
+
+  if [ "${_TOOL_FOUND}" != "true" ]; then
+
+    log_er "Checksum manifest found, but no supported checksum tool is available. Checksum verification is fail-closed."
+    sleep 8
+    panic  "[FATAL] Checksum manifest found, but no supported checksum tool is available. Checksum verification is fail-closed."
+
+  fi
+
+  if [ "${_VERIFICATION_EXECUTED}" != "true" ]; then
+
+    log_er "Checksum verification was not executed. Checksum verification is fail-closed."
+    sleep 8
+    panic  "[FATAL] Checksum verification was not executed. Checksum verification is fail-closed."
+
+  fi
+
+  if [ "${_VERIFICATION_SUCCEEDED}" != "true" ]; then
+
+    log_er "[FATAL] Checksum verification did not complete successfully. Evaluating fail-closed failure state."
+
+  fi
+
  case "${_RETURN_PGP},${_RETURN_SHA}" in

    "0,0")
@@ -345,6 +417,12 @@ Verify_checksums() {
      panic  "Verification of [sha checksum] file failed."
      ;;

+    *)
+      log_er "Unknown checksum verification state: [${_RETURN_PGP:-unset},${_RETURN_SHA:-unset}]."
+      sleep 8
+      panic  "[FATAL] Unknown checksum verification state. Checksum verification is fail-closed."
+      ;;
+
  esac
 }
 # vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
@@ -14,20 +14,42 @@
 # SPDX-PackageName: CISS.debian.live.builder
 # SPDX-Security-Contact: security@coresecret.eu

+# ToDo: Remove Debug
+
 # Module summary:
 # - Runs after the encrypted live root filesystem has been decrypted.
-# - Requires the pinned public key, attestation hash file, and detached signature to exist as readable, non-empty regular files
-#   inside the decrypted rootfs.
-# - Verifies the attestation signature with gpgv against the pinned key material.
-# - Confirms that the signature fingerprint matches the build-time expected rootfs fingerprint and panics on missing, malformed,
-#   or mismatched evidence.
-
-_SAVED_SET_OPTS="$(set +o)"
+# - Requires the pinned public key, external rootfs attestation manifest, and detached signature to exist as readable,
+#   non-empty regular files.
+# - Verifies the attestation signature with gpgv against the pinned key material and expected signer fingerprint.
+# - Verifies the exact final SquashFS byte stream copied into the decrypted LUKS mapper. The signed manifest provides both the
+#   SHA-512 digest and the exact byte length; allocation slack after that SquashFS payload is intentionally out of scope.
+# - Panics on missing, malformed, unauthentic, or mismatched evidence.

 set -eu
+PS4='+ 0042(): '
+set -x

 printf "\e[95m[INFO] Starting             : [/usr/lib/live/boot/0042_ciss_post_decrypt_attest] \n\e[0m"

+ciss_debug_countdown=8
+while [ "${ciss_debug_countdown}" -gt 0 ]; do
+
+  printf "\e[93m[DEBUG] 9990() countdown    : %s seconds \n\e[0m" "${ciss_debug_countdown}"
+  sleep 1
+  ciss_debug_countdown=$((ciss_debug_countdown - 1))
+
+done
+
+### Check panic command availability -------------------------------------------------------------------------------------------
+if ! command -v panic >/dev/null 2>&1; then
+
+  panic() {
+    printf '\e[91m[FATAL] %s \n\e[0m' "${*}" >&2
+    exit 1
+  }
+
+fi
+
 ### Declare variables ----------------------------------------------------------------------------------------------------------

 ### Will be replaced at build time:
@@ -36,10 +58,13 @@ 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 ----------------------
 export CDLB_MAPPER_NAME="${CDLB_MAPPER_NAME:-crypt_liveiso}"
+export CDLB_MAPPER_DEV="${CDLB_MAPPER_DEV:-/dev/mapper/${CDLB_MAPPER_NAME}}"
+export CDLB_MNT_MEDIUM="${CDLB_MNT_MEDIUM:-/run/live/medium}"

-### Attestation file locations inside decrypted rootfs. ------------------------------------------------------------------------
-CDLB_ATTEST_FPR_SHA="${CDLB_ATTEST_FPR_SHA:-/root/root/.ciss/attestation/${CDLB_EXP_FPR}.gpg.sha512sum.txt}"
-CDLB_ATTEST_FPR_SIG="${CDLB_ATTEST_FPR_SIG:-/root/root/.ciss/attestation/${CDLB_EXP_FPR}.gpg.sha512sum.txt.sig}"
+### Locations of the attestation file of filesystem.squashfs on the verified live medium. --------------------------------------
+CDLB_ROOTFS_ATTEST_MANIFEST="${CDLB_ROOTFS_ATTEST_MANIFEST:-${CDLB_MNT_MEDIUM}/live/filesystem.squashfs.sha512sum.txt}"
+CDLB_ROOTFS_ATTEST_SIGNATURE="${CDLB_ROOTFS_ATTEST_SIGNATURE:-${CDLB_ROOTFS_ATTEST_MANIFEST}.sig}"
+CDLB_ROOTFS_ATTEST_CHECK="${CDLB_ROOTFS_ATTEST_CHECK:-/run/ciss-rootfs-attestation.sha512sum}"
 CDLB_KEY_DIR="${CDLB_KEY_DIR:-/etc/ciss/keys}"

 ### Declare functions ----------------------------------------------------------------------------------------------------------
@@ -123,15 +148,167 @@ require_attestation_file() {
  return 0
 }

-HASH_FILE="${CDLB_ATTEST_FPR_SHA}"
-SIGN_FILE="${CDLB_ATTEST_FPR_SIG}"
+#######################################
+# Validate the decrypted rootfs payload device.
+# Globals:
+#   None
+# Arguments:
+#   1: Absolute payload device path
+# Returns:
+#   0: on success
+#######################################
+require_rootfs_payload_device() {
+  artifact_path="${1}"
+
+  if [ ! -e "${artifact_path}" ]; then
+
+    log_er "0042()              : Rootfs payload device missing: [${artifact_path}]"
+    panic  "0042()              : Rootfs payload device missing: [${artifact_path}]"
+
+  fi
+
+  if [ -L "${artifact_path}" ] || { [ ! -b "${artifact_path}" ] && [ ! -f "${artifact_path}" ]; }; then
+
+    log_er "0042()              : Rootfs payload must be a block device or regular test fixture: [${artifact_path}]"
+    panic  "0042()              : Rootfs payload must be a block device or regular test fixture: [${artifact_path}]"
+
+  fi
+
+  if [ ! -r "${artifact_path}" ]; then
+
+    log_er "0042()              : Rootfs payload is not readable: [${artifact_path}]"
+    panic  "0042()              : Rootfs payload is not readable: [${artifact_path}]"
+
+  fi
+
+  return 0
+}
+
+#######################################
+# Stream exactly the attested SquashFS payload bytes from the decrypted mapper.
+# Globals:
+#   None
+# Arguments:
+#   1: Payload device or regular test fixture
+#   2: Exact payload byte count
+# Returns:
+#   0: on success
+#######################################
+stream_rootfs_payload() {
+  payload_device="${1}"
+  payload_size="${2}"
+  block_size=1048576
+  full_blocks=$((payload_size / block_size))
+  remainder=$((payload_size % block_size))
+
+  if [ "${full_blocks}" -gt 0 ]; then
+
+    dd if="${payload_device}" bs="${block_size}" count="${full_blocks}" 2>/dev/null || return 1
+
+  fi
+
+  if [ "${remainder}" -gt 0 ]; then
+
+    dd if="${payload_device}" bs="${block_size}" skip="${full_blocks}" count=1 2>/dev/null | dd bs=1 count="${remainder}" 2>/dev/null || return 1
+
+  fi
+
+  return 0
+}
+
+#######################################
+# Verify the attested SquashFS payload hash against the decrypted mapper bytes.
+# Globals:
+#   CDLB_ROOTFS_ATTEST_CHECK
+# Arguments:
+#   1: Manifest path
+#   2: Payload device path
+# Returns:
+#   0: on success
+#######################################
+verify_rootfs_payload() {
+  manifest_path="${1}"
+  payload_device="${2}"
+  payload_size=""
+  payload_hash=""
+
+  payload_size="$(awk '/^# Bytes[[:space:]]*:[[:space:]]Final filesystem[.]squashfs[[:space:]]+[0-9]+[[:space:]]*$/ {print $NF; exit}' "${manifest_path}")"
+  payload_hash="$(awk '($0 !~ /^#/ && NF >= 2){print $1; exit}' "${manifest_path}")"
+
+  case "${payload_size}" in
+
+    ""|*[!0-9]*)
+      log_er "0042()              : Rootfs attestation manifest has invalid payload size."
+      panic  "0042()              : Rootfs attestation manifest has invalid payload size."
+      ;;
+
+  esac
+
+  if [ "${payload_size}" -le 0 ]; then
+
+    log_er "0042()              : Rootfs attestation manifest has empty payload size."
+    panic  "0042()              : Rootfs attestation manifest has empty payload size."
+
+  fi
+
+  case "${payload_hash}" in
+
+    ""|*[!0123456789abcdefABCDEF]*)
+      log_er "0042()              : Rootfs attestation manifest has invalid SHA-512 payload hash."
+      panic  "0042()              : Rootfs attestation manifest has invalid SHA-512 payload hash."
+      ;;
+
+  esac
+
+  if [ "${#payload_hash}" -ne 128 ]; then
+
+    log_er "0042()              : Rootfs attestation manifest SHA-512 payload hash has invalid length."
+    panic  "0042()              : Rootfs attestation manifest SHA-512 payload hash has invalid length."
+
+  fi
+
+  if ! printf '%s  -\n' "${payload_hash}" > "${CDLB_ROOTFS_ATTEST_CHECK}"; then
+
+    log_er "0042()              : Failed to prepare transient rootfs payload checksum file."
+    panic  "0042()              : Failed to prepare transient rootfs payload checksum file."
+
+  fi
+
+  chmod 0600 "${CDLB_ROOTFS_ATTEST_CHECK}" 2>/dev/null || :
+
+  log_in "0042()               : Verifying exact SquashFS payload bytes from: [${payload_device}]"
+
+  # stream_rootfs_payload may be evaluated in a pipeline here; sha512sum -c is the fail-closed authority for truncated or
+  # tampered payload bytes.
+  # shellcheck disable=SC2310
+  if ! stream_rootfs_payload "${payload_device}" "${payload_size}" | /usr/bin/sha512sum -c "${CDLB_ROOTFS_ATTEST_CHECK}"; then
+
+    log_er "0042()              : Rootfs payload SHA-512 verification failed."
+    panic  "0042()              : Rootfs payload SHA-512 verification failed."
+
+  fi
+
+  log_ok "0042()               : Rootfs payload SHA-512 verification successful."
+
+  return 0
+}
+
+HASH_FILE="${CDLB_ROOTFS_ATTEST_MANIFEST}"
+SIGN_FILE="${CDLB_ROOTFS_ATTEST_SIGNATURE}"
 KEYFILE="${CDLB_KEY_DIR}/${CDLB_EXP_FPR}.gpg"

-require_attestation_file "Public key"            "${KEYFILE}"
-require_attestation_file "Attestation data"      "${HASH_FILE}"
-require_attestation_file "Attestation signature" "${SIGN_FILE}"
+log_in "0042()               : Validating [${KEYFILE}]"
+require_attestation_file "Public key"                   "${KEYFILE}"
+log_in "0042()               : Validating [${HASH_FILE}]"
+require_attestation_file "Rootfs attestation manifest"  "${HASH_FILE}"
+log_in "0042()               : Validating [${SIGN_FILE}]"
+require_attestation_file "Rootfs attestation signature" "${SIGN_FILE}"
+log_in "0042()               : Validating [${CDLB_MAPPER_DEV}]"
+require_rootfs_payload_device "${CDLB_MAPPER_DEV}"

-log_in "0042()               : Verifying rootfs attestation with 'gpgv' and inside LUKS encrypted rootfs pinned GPG FPR."
+log_ok "0042()               : Rootfs attestation inputs are present and readable."
+
+log_in "0042()               : Verifying rootfs attestation manifest with 'gpgv' and pinned GPG FPR."

 if ! _STATUS="$(/usr/bin/gpgv --keyring "${KEYFILE}" --status-fd 1 "${SIGN_FILE}" "${HASH_FILE}" 2>&1)"; then

@@ -163,7 +340,7 @@ else

 fi

-eval "${_SAVED_SET_OPTS}"
+verify_rootfs_payload "${HASH_FILE}" "${CDLB_MAPPER_DEV}"

 printf "\e[92m[INFO] Successfully applied : [/usr/lib/live/boot/0042_ciss_post_decrypt_attest] \n\e[0m"

@@ -497,7 +497,34 @@ setup_unionfs ()

  ### CISS override for /usr/lib/live/boot/0042_ciss_post_decrypt_attest -------------------------------------------------------
  printf "\e[95m[INFO] Calling              : [/usr/lib/live/boot/0042_ciss_post_decrypt_attest] ... \n\e[0m"
-  [ -x /usr/lib/live/boot/0042_ciss_post_decrypt_attest ] && /usr/lib/live/boot/0042_ciss_post_decrypt_attest
+
+  # ToDo: Remove debug.
+
+  ciss_debug_countdown=8
+  while [ "${ciss_debug_countdown}" -gt 0 ]; do
+
+    printf "\e[93m[DEBUG] 9990() countdown    : %s seconds \n\e[0m" "${ciss_debug_countdown}"
+    sleep 1
+    ciss_debug_countdown=$((ciss_debug_countdown - 1))
+
+  done
+
+  chmod +x /usr/lib/live/boot/0042_ciss_post_decrypt_attest
+
+  if [ -x /usr/lib/live/boot/0042_ciss_post_decrypt_attest ]; then
+
+      if ! /usr/lib/live/boot/0042_ciss_post_decrypt_attest; then
+
+        panic "[FATAL] [/usr/lib/live/boot/0042_ciss_post_decrypt_attest] failed."
+
+      fi
+
+  else
+
+    panic "[FATAL] [/usr/lib/live/boot/0042_ciss_post_decrypt_attest] missing or not executable."
+
+  fi
+
  printf "\e[92m[INFO] Calling              : [/usr/lib/live/boot/0042_ciss_post_decrypt_attest] done. \n\e[0m"
  ### CISS override for /usr/lib/live/boot/0042_ciss_post_decrypt_attest -------------------------------------------------------

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. DNSSEC Status

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. Haveged Audit on Netcup RS 2000 G11

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. Lynis Audit:

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. SSH Audit by ssh-audit.com

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. TLS Audit:
 ````text
@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. Hardened Kernel Boot Parameters

@@ -8,10 +8,22 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. Changelog

+## V9.14.024.2026.06.11
+* **Added**: [lib_build_dir_safety.sh](../lib/lib_build_dir_safety.sh) Integrated Security Audit Finding A12
+* **Added**: [lib_debug_sanitize.sh](../lib/lib_debug_sanitize.sh) Integrated Security Audit Finding A11
+* **Added**: [lib_secret_validation.sh](../lib/lib_secret_validation.sh) Integrated Security Audit Finding A10
+* **Changed**: [zzzz_ciss_crypt_squash.hook.binary](../config/hooks/live/zzzz_ciss_crypt_squash.hook.binary) Integrated Security Audit Finding A01 + A10
+* **Changed**: [0030-ciss-verify-checksums](../config/includes.chroot/usr/lib/live/boot/0030-ciss-verify-checksums) Integrated Security Audit Finding A02
+* **Changed**: [0042_ciss_post_decrypt_attest](../config/includes.chroot/usr/lib/live/boot/0042_ciss_post_decrypt_attest) Integrated Security Audit Finding A01
+* **Changed**: [lib_ciss_upgrades_boot.sh](../lib/lib_ciss_upgrades_boot.sh) Integrated Security Audit Finding A01
+* **Changed**: [lib_lb_config_start.sh](../lib/lib_lb_config_start.sh) Integrated Security Audit Finding A12
+* **Changed**: [README.md](../README.md) Integrated Security Audit Finding A01 + A02
+* **Changed**: [lib_usage.sh](../lib/lib_usage.sh) Integrated Security Audit Finding A10
+
 ## V9.14.022.2026.06.10
 * **Added**: [lib_logo.sh](../lib/lib_logo.sh)
 * **Added**: [9999_cdi_starter.sh](../scripts/usr/local/sbin/9999_cdi_starter.sh) Retrieve rdns for Primordial-Workflow™
@@ -196,7 +208,7 @@ include_toc: true
 * **Added**: [lib_ciss_upgrades_build.sh](../lib/lib_ciss_upgrades_build.sh) Updates for CISS and PhysNet Primordial-Workflow™.
 * **Added**: [lib_gnupg.sh](../lib/lib_gnupg.sh) Updates for CISS and PhysNet Primordial-Workflow™.
 * **Added**: [lib_primordial.sh](../lib/lib_primordial.sh) Updates for CISS and PhysNet Primordial-Workflow™.
-* **Added**: [0030-ciss-verify-checksums](../scripts/usr/lib/live/boot/0030-ciss-verify-checksums) Unified handling via includes.chroot.
+* **Added**: [0030-ciss-verify-checksums](../.archive/0030-ciss-verify-checksums) Unified handling via includes.chroot.
 * **Bugfixes**: [linter_char_scripts.yaml](../.gitea/workflows/linter_char_scripts.yaml) - WORKFLOW_ID="${GITHUB_WORKFLOW:-linter_char_scripts.yaml}"
 * **Bugfixes**: [render-dnssec-status.yaml](../.gitea/workflows/render-dnssec-status.yaml) - WORKFLOW_ID="${GITHUB_WORKFLOW:-render-dnssec-status.yaml}"
 * **Bugfixes**: [render-dot-to-png.yaml](../.gitea/workflows/render-dot-to-png.yaml) - WORKFLOW_ID="${GITHUB_WORKFLOW:-render-dot-to-png.yaml}"
@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. Centurion Net - Developer Branch Overview

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. Purpose

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. Contributing / participating

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. Credits

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. Download the latest PUBLIC CISS.debian.live.ISO

@@ -8,14 +8,14 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2.1. Usage
 ````text
                        CDLB(1)                        CISS.debian.live.builder                        CDLB(1)

 CISS.debian.live.builder from https://git.coresecret.dev/msw
-Master V9.14.022.2026.06.10
+Master V9.14.026.2026.06.12
 A lightweight Shell Wrapper for building a hardened Debian Live ISO Image.

 (c) Marc S. Weidner, 2018 - 2026
@@ -37,6 +37,7 @@ A lightweight Shell Wrapper for building a hardened Debian Live ISO Image.

  --build-directory </path/to/build_directory>
    Where the Debian Live Build Image should be generated. RECOMMENDED path: </opt/cdlb>
+    Cleanup is destructive inside the exact builder-owned path and requires '.ciss-live-builder-owned'.
    MUST be provided.

  --change-splash <STRING> one of <club | hexagon>
@@ -57,6 +58,7 @@ A lightweight Shell Wrapper for building a hardened Debian Live ISO Image.
  --debug, -d
    Enables debug logging for the main program routine. Detailed logging information are written to:
    </tmp/ciss_live_builder_1801049.log>
+    After xtrace is stopped and its debug FD is closed, a final exact-value redaction pass sanitizes logs.

  --dhcp-centurion
    If a DHCP lease is provided, the provider's name server will be overridden and the hardened, privacy-focused
@@ -86,12 +88,12 @@ A lightweight Shell Wrapper for building a hardened Debian Live ISO Image.

  --key_age=*
    The SOPS AGE private keyring for decryption operations. Change '*' to your desired SOPS AGE key file.
-    File MUST be placed in:
+    This MUST be a filename only and MUST be placed in the root-owned tmpfs secret root:
    </dev/shm/cdlb_secrets>

  --key_luks=*
    The LUKS encryption / decryption passphrase for '/'-fs-encryption. Change '*' to your desired passphrase file.
-    File MUST be placed in:
+    This MUST be a filename only and MUST be placed in the root-owned tmpfs secret root:
    </dev/shm/cdlb_secrets>

  --log-statistics-only
@@ -140,7 +142,8 @@ A lightweight Shell Wrapper for building a hardened Debian Live ISO Image.
  --root-password-file </dev/shm/cdlb_secrets/password.txt>>
    Password file for 'root', if given, MUST be a string of 42 to 64 characters.
    If the argument is omitted, no further login authentication is required for the local console.
-    MUST be placed in:
+    The path MUST be absolute, regular, non-symlink, root-owned, and mode 0400 after normalization.
+    RECOMMENDED path:
    </dev/shm/cdlb_secrets/password.txt>

  --secure-boot-profile <STRING> one of <debian-shim | ciss-uki>
@@ -156,7 +159,7 @@ A lightweight Shell Wrapper for building a hardened Debian Live ISO Image.
    specified via '--signing_key=*'. If the keyring is protected, then provide the passphrase in its own file.
    Specify the fingerprint of the key to use via '--signing_key_fpr=*'.
    Optionally import an offline GPG CA signing public key via: '--signing_ca=*'.
-    Change '*' to your desired files / fingerprint. Files MUST be placed in:
+    Change '*' to your desired filename-only files / fingerprint. Files MUST be placed in:
    </dev/shm/cdlb_secrets>

  --sshfp
@@ -171,6 +174,7 @@ A lightweight Shell Wrapper for building a hardened Debian Live ISO Image.

  --ssh-pubkey </dev/shm/cdlb_secrets/>
    Imports the SSH Public Key from the file 'authorized_keys' into the Live ISO.
+    Directory MUST be absolute, regular, non-symlink, root-owned, and not group/world-writable.
    Key file MUST be placed in:
    </dev/shm/cdlb_secrets/authorized_keys>

@@ -186,7 +190,7 @@ A lightweight Shell Wrapper for building a hardened Debian Live ISO Image.
 💷 Please consider donating to my work at:
 🌐 https://coresecret.eu/spenden/

-                        V9.14.022.2026.06.10                        2026-05-17                         CDLB(1)
+                        V9.14.026.2026.06.12                        2026-05-17                         CDLB(1)
 ````

 # 3. Booting
@@ -8,23 +8,23 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. CISS.debian.live.builder – Boot & Trust Chain (Technical Documentation)

-**Status:** 2025-11-12<br>
+**Status:** 2026-06-10<br>
 **Audience:** CICA CISO, CISS staff, technically proficient administrators<br>
-**Summary:** The **CISS.debian.live.builder** Live-ISO establishes a two-stage verification chain around the live root: an early ISO-edge check (signature and FPR pin) *before* LUKS unlock, and a late root-FS attestation *after* unlock, reinforced by `dm-crypt (AES-XTS)` and `dm-integrity (HMAC-SHA-512)`. UEFI Secure Boot can use either the default Microsoft/Debian shim chain, or a CISS-signed UKI chain for systems that trust the CISS Secure Boot key material.<br>
+**Summary:** The **CISS.debian.live.builder** Live-ISO establishes a two-stage verification chain around the live root: after the CISS LUKS/dm-integrity container has been opened, and the live medium context has been exposed, `0030-ciss-verify-checksums` verifies the mounted live-medium checksum manifest, detached signature, and signer fingerprint; later, `0042_ciss_post_decrypt_attest` verifies the signed rootfs attestation manifest, and the exact final SquashFS payload bytes copied into the decrypted LUKS mapper. UEFI Secure Boot can use either the default Microsoft/Debian shim chain, or a CISS-signed UKI chain for systems that trust the CISS Secure Boot key material.<br>

 # 3. Overview

 * **Trust anchor:** Pinned fingerprint (FPR) of the signing key embedded at build time in initramfs hooks.
-* **Integrity & authenticity verification:**
+* **Integrity and authenticity verification:**

-  1. **Early:** Verify `sha512sum.txt` at the ISO edge using `gpgv` and FPR pin.
-  2. **Late:** Verify an attestation hash list inside the decrypted root FS using `gpgv` and FPR pin.
+  1. **Mounted live medium:** After `0024-ciss-crypt-squash` has opened the encrypted container and exposed `/run/live/medium`, verify `sha512sum.txt` using `gpgv`, FPR pinning, and checksum execution.
+  2. **Decrypted rootfs payload:** Verify the external rootfs attestation manifest using `gpgv` and FPR pinning, then verify the exact SquashFS payload bytes from the decrypted mapper with `sha512sum -c`.

-* **Storage-level AEAD (functional):** `dm-crypt` (AES-XTS-512) and `dm-integrity` (HMAC-SHA-512, 4 KiB).
+* **Storage-level confidentiality and keyed sector integrity:** `dm-crypt` (AES-XTS-512) and `dm-integrity` (HMAC-SHA-512, 4 KiB).
 * **Remotely unlock:** CISS hardened and build dropbear, modern primitives only, no passwords, no agent/forwarding.

 # 3.1. Secure Boot Profiles
@@ -49,15 +49,15 @@ private Secure Boot key names are detected in those paths before live-build chec

 # 4. Primitives & Parameters

-| Component    | Primitive / Parameter                                     | Purpose                                                |
-|--------------|-----------------------------------------------------------|--------------------------------------------------------|
-| LUKS2        | `aes-xts-plain64`, `--key-size 512`, `--sector-size 4096` | Confidentiality (2×256-bit XTS)                        |
-| dm-integrity | `hmac-sha512` (keyed), journal                            | Adversary-resistant per-sector integrity, authenticity |
-| PBKDF        | `argon2id`, `--iter-time 1000` ms                         | Key derivation, hardware-agnostic                      |
-| Signatures   | Ed25519 or RSA-4096 (FPR pinned)                          | Public verifiability, non-repudiation                  |
-| Verification | `gpgv --no-default-keyring`                               | No agent dependency in initramfs                       |
-| Hash lists   | `sha512sum` format                                        | Deterministic content verification                     |
-| Dropbear     | Modern KEX/AEAD (per `localoptions.h`)                    | Minimal attack surface, remote unlock                  |
+| Component    | Primitive / Parameter                                                            | Purpose                                                                    |
+|--------------|----------------------------------------------------------------------------------|----------------------------------------------------------------------------|
+| LUKS2        | `aes-xts-plain64`, `--key-size 512`, `--sector-size 4096`                        | Confidentiality (2×256-bit XTS)                                            |
+| dm-integrity | `hmac-sha512` (keyed), journal                                                   | Keyed per-sector integrity for the opened mapping; not origin authenticity |
+| PBKDF        | `argon2id`, `--iter-time 1000` ms, `--pbkdf-memory 262144`, `--pbkdf-parallel 1` | Bounded key derivation cost for initramfs unlock                           |
+| Signatures   | Ed25519 or RSA-4096 (FPR pinned)                                                 | Public verifiability, non-repudiation                                      |
+| Verification | `gpgv --no-default-keyring`                                                      | No agent dependency in initramfs                                           |
+| Hash lists   | `sha512sum` format                                                               | Deterministic content verification                                         |
+| Dropbear     | Modern KEX/AEAD (per `localoptions.h`)                                           | Minimal attack surface, remote unlock                                      |

 # 5. Diagram: CISS Live ISO Boot Flow
 ```mermaid
@@ -93,11 +93,11 @@ flowchart TD
    0100 e10@--> 0110["Executing live-boot, mounting ISO FS"];
    0110 e11@--> 0122["Executing 0022-ciss: Hardening tmpfs for OverlayFS upper/work"];
    0122 e12@--> 0124["Executing 0024-ciss: LUKS open (dm-crypt & integrity)"];
-    0124 e13@--> |SUCCESSFUL| LUKS["Unlocking LUKS2 Argon2id PBKDF → XTS + HMAC-SHA512"];
-    LUKS e14@--> ROOT["Assemble RootFS OverlayFS"];
-    ROOT e15@--> 0126["Executing 0026-ciss: Hardening early sysctls"];
-    0126 e16@--> 0130["Executing 0030-ciss: Verification of authenticity and integrity via embedded and pinned GPG of ISO edge"];
-    0130 e17@--> |SUCCESSFUL| 0142["Executing 0042-ciss: Attestation of RootFS"];
+    0124 e13@--> |SUCCESSFUL| LUKS["Decrypted mapper exposed; livefs_root=/run/live/medium set"];
+    LUKS e14@--> 0126["Executing 0026-ciss: Hardening early sysctls"];
+    0126 e15@--> 0130["Executing 0030-ciss: Mounted live-medium checksum and signature verification"];
+    0130 e16@--> |SUCCESSFUL| ROOT["9990-overlay: Mount SquashFS / OverlayFS"];
+    ROOT e17@--> 0142["Executing 0042-ciss: Attestation of RootFS SquashFS payload"];
    0142 e18@--> 0145["init-bottom: stop CISS.hardened dropbear, tear down initramfs net"];
    0145 e19@--> 9050["Switching root (run-init / pivot_root)"];
    9050 e20@--> 9010["Starting /sbin/init -> systemd"];
@@ -135,22 +135,32 @@ flowchart TD
 ```

 # 6. Diagram: CISS Live ISO LUKS and dm-integrity layering
+
+```text
+ISO medium
+└── /live/ciss_rootfs.crypt
+    └── LUKS2 / dm-crypt / dm-integrity
+        └── /dev/mapper/crypt_liveiso
+            └── SquashFS rootfs [SHA-512 over exact SquashFS byte stream]
+                └── OverlayFS / running root filesystem
+```
+
 ```mermaid
 ---
 config:
      theme: forest
 ---
 flowchart TD
-0{{"Plain device: CD-ROM / USB"}} --> 1["ISO image (ISO9660 + ESP)"];
-1 --> 2["Mount ISO9660 FS → /run/live/medium"];
-2 --> 3["Container file /run/live/medium/live/ciss_rootfs.crypt"];
-3 --> 4["dm-integrity layer (HMAC-SHA-512, 4 KiB)"];
-4 --> 5["dm-crypt LUKS2 (AES-XTS-512) → /dev/mapper/crypt_liveiso"];
-5 --> 6["Mount SquashFS from /dev/mapper/crypt_liveiso → /run/live/rootfs"];
+0{{"Plain device: CD-ROM / USB"}} --> 1["ISO medium (ISO9660 + ESP)"];
+1 --> 2["/live/ciss_rootfs.crypt"];
+2 --> 3["LUKS2 / dm-crypt / dm-integrity"];
+3 --> 4["/dev/mapper/crypt_liveiso"];
+4 --> 5["SquashFS rootfs byte stream"];
+5 --> 6["OverlayFS / running root filesystem"];

 ```

-**Note:** Encrypt-then-MAC at the block layer (functionally AEAD-equivalent). Any manipulation ⇒ hard I/O error.
+**Note:** `dm-integrity` provides keyed sector integrity for the opened LUKS mapping. It is not treated as origin authenticity; origin authenticity is provided by the signed checksum and rootfs attestation manifests plus pinned signer fingerprints.

 # 7. CISS Live ISO LUKS Build-Time Core Steps
 ```sh
@@ -165,6 +175,8 @@ cryptsetup luksFormat \
  --luks2-keyslots-size 16777216 \
  --luks2-metadata-size 4194304 \
  --pbkdf argon2id \
+  --pbkdf-memory 262144 \
+  --pbkdf-parallel 1 \
  --sector-size 4096 \
  --type luks2 \
  --use-random \
@@ -174,9 +186,9 @@ cryptsetup luksFormat \

 **Signing keys:** Ed25519 and RSA-4096; **FPR pinned at build time** in hooks. Signing keys are **additionally** signed by an offline GPG Root-CA (out-of-band trust chain).

-# 8. Early ISO-Edge Verification (CISS modified hook 0030-ciss-verify-checksums, live-bottom)
+# 8. Mounted Live-Medium Checksum Verification (CISS modified hook 0030-ciss-verify-checksums, live-bottom)

-**Goal:** Before consuming any medium content, verify:
+**Goal:** After `0024-ciss-crypt-squash` has opened the encrypted container and exposed the live medium context, but before the final live root is accepted, verify:

 1. **Detached signature of `sha512sum.txt`** using `gpgv` against the embedded public key.
 2. **FPR pinning:** Parse `VALIDSIG` and require exact match with the build-time pinned FPR.
@@ -185,30 +197,34 @@ cryptsetup luksFormat \
 **Core call (initramfs):**

 ```sh
-/usr/bin/gpgv --no-default-keyring --keyring "$KEYFILE" --status-fd 1 --verify sha512sum.txt.sig sha512sum.txt
+/usr/bin/gpgv --keyring "$KEYFILE" --status-fd 1 sha512sum.txt.sig sha512sum.txt
 # parse [GNUPG:] VALIDSIG ... <FPR> ...
 ```

 # 9. Late Root-FS Attestation and dmsetup Health (CISS hook 0042_ciss_post_decrypt_attest, called by 9990-overlay.sh)

-**Goal:** After LUKS unlock, validate the **decrypted** contents and the **actual** mapping topology.
+**Goal:** After LUKS unlocked, validate the **decrypted** rootfs payload selected at build time and the **actual** mapping topology.

-* **Attestation files:** `/root/.ciss/attestation/<FPR>.sha512sum.txt[.sig]`
+* **Attested boundary:** the final `binary/live/filesystem.squashfs` byte stream, immediately before it is copied into `/dev/mapper/crypt_liveiso` by `zzzz_ciss_crypt_squash.hook.binary`.
+* **Runtime verification boundary:** the first byte count declared by `# Bytes    : Final filesystem.squashfs <bytes>` in the signed manifest, read from the decrypted mapper. Any LUKS allocation slack after the SquashFS payload is intentionally excluded.
+* **Attestation files:** `/run/live/medium/live/filesystem.squashfs.sha512sum.txt[.sig]`
 * **Key source:** `/etc/ciss/keys/*.gpg` (accepted only if FPR == build-pin)

 **Core calls (initramfs):**

 ```sh
 # 1) Signature and FPR pin (no agent)
-/usr/bin/gpgv --no-default-keyring --keyring "$KEYFILE" --status-fd 1 --verify "$SIG" "$DATA"
+/usr/bin/gpgv --keyring "${KEYFILE}" --status-fd 1 "${SIG}" "${DATA}"

-# 2) Optional: Content hash verification
-( cd "$ROOTMP" && /usr/bin/sha512sum -c --strict --quiet "$DATA" )
+# 2) Mandatory content hash verification
+dd if="${CDLB_MAPPER_DEV}" ... | /usr/bin/sha512sum -c /run/ciss-rootfs-attestation.sha512sum
 ```

 # 10. Failure Policy (fail-closed, deterministic)

-* **Abort** on: missing `VALIDSIG`, FPR mismatch, missing key / signature.
+* **Abort** on: missing checksum manifest, unsupported checksum manifest/tool state, failed checksum, empty checksum manifest, missing `VALIDSIG`, FPR mismatch, missing key/signature, malformed rootfs attestation manifest, or rootfs payload hash mismatch.
+* A signed rootfs manifest alone is not sufficient. Boot continues only after the manifest signature/FPR, and the decrypted SquashFS payload bytes both verify successfully.
+* `dm-integrity` protects the opened LUKS mapping against sector corruption or tampering under the LUKS key, but it is not treated as origin authenticity. Origin authenticity is provided by the signed rootfs attestation manifest and pinned signer fingerprint.

 # 11. CISS hardened and built dropbear

@@ -233,14 +249,16 @@ cryptsetup luksFormat \
  * [9990-main.sh](../config/includes.chroot/usr/lib/live/boot/9990-main.sh),
  * [9990-networking.sh](../config/includes.chroot/usr/lib/live/boot/9990-networking.sh),
  * [9990-overlay.sh](../config/includes.chroot/usr/lib/live/boot/9990-overlay.sh).
-* **Hooks (boot view):** 
-  * `/scripts/live-premount/0022-ciss-overlay-tmpfs`, 
-  * `/scripts/live-premount/0024-ciss-crypt-squash`,
-  * `/scripts/live-premount/0026-ciss-early-sysctl`,
-  * `/scripts/live-bottom/0030-ciss-verify-checksums`,
-  * `/scripts/live-bottom/0042-ciss-post-decrypt-attest`
+* **Hooks (initramfs boot view):**
+  * `/usr/lib/live/boot/0022-ciss-overlay-tmpfs`,
+  * `/usr/lib/live/boot/0024-ciss-crypt-squash`,
+  * `/usr/lib/live/boot/0026-ciss-early-sysctl`,
+  * `/usr/lib/live/boot/0030-ciss-verify-checksums`,
+  * `/usr/lib/live/boot/0042_ciss_post_decrypt_attest`,
+  * `/usr/lib/live/boot/9990-main.sh`,
+  * `/usr/lib/live/boot/9990-overlay.sh`
 * **Key files:**
-  * ISO edge (for 0030): embedded public key blob (project-specific FPR)
+  * Mounted live medium (for 0030): embedded public key blob (project-specific FPR)
  * Root FS (for 0042): `/etc/ciss/keys/<FPR>.gpg`
 * **Mounts (typical):** `/run/live/rootfs`, `/run/live/overlay`

@@ -249,20 +267,21 @@ cryptsetup luksFormat \
 flowchart TD

  subgraph ISO Build Time
-    A["Embed and pin GPG FPR (into ISO & RootFS as needed)"] e00@--> B["Generate ISO-edge sha512sum.txt and .sig"];
+    A["Embed and pin GPG FPR (into ISO & RootFS as needed)"] e00@--> B["Generate mounted-medium sha512sum.txt and .sig"];
    B e01@--> C["Build filesystem.squashfs and wrap it into ciss_rootfs.crypt"];
    e00@{ animation: fast }
    e01@{ animation: fast }
  end

  subgraph ISO Boot Time
-    C e02@--> D["0024 LUKS2, dm-integrity HMAC-SHA512"];
-    D e03@-->|SUCCESSFUL| E["ciss_rootfs.crypt opened"];
-    E e04@--> F["Mounting RootFS"];
-    F e05@--> G["0030 verification of authenticity and integrity via embedded and pinned GPG of ISO edge"];
-    G e06@-->|SUCCESSFUL| H["ISO edge verified"];
-    H e07@--> I["0042 post-decrypt-attestation of RootFS"];
-    I e08@-->|SUCCESSFUL| J["RootFS attestation successful"];
+    C e02@--> D["0024 opens ciss_rootfs.crypt with LUKS2 and dm-integrity"];
+    D e03@-->|SUCCESSFUL| E["Decrypted mapper exposed and livefs_root=/run/live/medium set"];
+    E e04@--> F["0030 verifies mounted live-medium manifest, signature, FPR, and checksums"];
+    F e05@-->|SUCCESSFUL| G["Mounted live medium verified"];
+    G e06@--> H["9990-overlay mounts SquashFS / OverlayFS"];
+    H e07@--> I["0042 verifies signed rootfs attestation manifest and FPR"];
+    I e08@--> J["0042 verifies exact SquashFS bytes from /dev/mapper/crypt_liveiso"];
+    J e09@-->|SUCCESSFUL| K["RootFS SquashFS payload attestation successful"];
    e02@{ animation: fast }
    e03@{ animation: fast }
    e04@{ animation: fast }
@@ -270,22 +289,24 @@ flowchart TD
    e06@{ animation: fast }
    e07@{ animation: fast }
    e08@{ animation: fast }
-  end
-
-  subgraph ISO Run Time
-    J e09@--> K{{"CISS.debian.live.builder ISO running"}};
-    X{{"CISS.debian.live.builder Boot process halted"}};
    e09@{ animation: fast }
  end

+  subgraph ISO Run Time
+    K e10@--> L{{"CISS.debian.live.builder ISO running"}};
+    X{{"CISS.debian.live.builder Boot process halted"}};
+    e10@{ animation: fast }
+  end
+
 D -- FAIL --> X;
-G -- FAIL --> X;
+F -- FAIL --> X;
 I -- FAIL --> X;
+J -- FAIL --> X;
 ```

 # 14. Closing Remarks

-This achieves a portable, self-contained trust chain without a Microsoft-db, providing strong protection against medium tampering, bitrot, and active attacks **both before and after decryption**. The dual-verification phases make the state transparent and deterministic.
+This achieves a portable, self-contained trust chain without a Microsoft-db, providing strong protection at the mounted-medium and decrypted-rootfs-payload boundaries. The dual-verification phases make the state transparent and deterministic without treating `dm-integrity`, LUKS, or private infrastructure as substitutes for origin authenticity.

 ---
 **[no tracking | no logging | no advertising | no profiling | no bullshit](https://coresecret.eu/)**
@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. SSH Host Key Policy – CISS.debian.live.builder / CISS.debian.installer

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. Resources

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. ``30-ciss-hardening.conf``

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. ``90-ciss-local.hardened``

@@ -8,7 +8,7 @@ include_toc: true
 **Centurion Intelligence Consulting Agency Information Security Standard**<br>
 *Debian Live Build Generator for hardened live environment and CISS Debian Installer*<br>
 **Master Version**: 9.14<br>
-**Build**: V9.14.022.2026.06.10<br>
+**Build**: V9.14.026.2026.06.12<br>

 # 2. ``ciss_live_builder.sh``

@@ -57,7 +57,6 @@ guard_sourcing || return "${ERR_GUARD_SRCE}"
 #   None
 # Returns:
 #   ERR_ARG_MSMTCH: on failure
-#   ERR_ARG_MSMTCH: on failure
 #   ERR_CONTROL_CT: on failure
 #   ERR_DROPBEAR_V: on failure
 #   ERR_MISS_PWD_F: on failure
@@ -76,7 +75,6 @@ guard_sourcing || return "${ERR_GUARD_SRCE}"
 #   ERR__SSH__PORT: on failure
 #######################################
 arg_parser() {
-  declare primordial_key_regex='^[A-Za-z0-9._@%+=:,~-]+$'
  declare primordial_url_regex='^https://[A-Za-z0-9.-]+/[A-Za-z0-9._~/%+=:@,-]+\.git$'

  while [[ $# -gt 0 ]]; do
@@ -109,6 +107,16 @@ arg_parser() {
          shift 1
          ;;

+        -l | --logo)
+          if [[ -n "${2-}" && "${2}" != -* ]]; then
+            if ! ${VAR_HANDLER_AUTOBUILD}; then boot_screen_cleaner; fi
+            printf "\e[91m❌ Error: --logo MUST NOT be followed by an argument.\e[0m\n" >&2
+            read -p -r $'\e[92m✅ Press \'ENTER\' to exit the script ... \e[0m'
+            exit "${ERR_ARG_MSMTCH}"
+          fi
+          shift 1
+          ;;
+
        -v | --version)
          if [[ -n "${2-}" && "${2}" != -* ]]; then
            if ! ${VAR_HANDLER_AUTOBUILD}; then boot_screen_cleaner; fi
@@ -134,10 +142,9 @@ arg_parser() {
          ;;

        --build-directory)
-          declare -gx VAR_HANDLER_BUILD_DIR="${2}"
-          if [[ ! "${VAR_HANDLER_BUILD_DIR}" =~ ^/ ]]; then
+          declare -gx VAR_HANDLER_BUILD_DIR="${2-}"
+          if ! validate_build_dir_argument "${VAR_HANDLER_BUILD_DIR}"; then
            if ! ${VAR_HANDLER_AUTOBUILD}; then boot_screen_cleaner; fi
-            printf "\e[91m❌ Error: --build-directory MUST be an absolute path. Got: '%s'\n" "${VAR_HANDLER_BUILD_DIR}" >&2
            exit "${ERR_NOTABSPATH}"
          fi
          declare -gx VAR_BUILD_LOG="${VAR_HANDLER_BUILD_DIR}/cdlb_${VAR_ISO8601}_build.log"
@@ -156,7 +163,7 @@ arg_parser() {
          shift 1
          ;;

-        --change-splash )
+        --change-splash)
          if [[ "${2}" == "club" || "${2}" == "hexagon" ]]; then
            # shellcheck disable=SC2034
            declare -g VAR_HANDLER_SPLASH="${2}"
@@ -266,18 +273,28 @@ arg_parser() {
          ;;

        --key_age=*)
+          declare key_age="${1#*=}"
+          if ! validate_secret_filename "--key_age" "${key_age}"; then
+            if ! ${VAR_HANDLER_AUTOBUILD}; then boot_screen_cleaner; fi
+            exit "${ERR_ARG_MSMTCH}"
+          fi
          # shellcheck disable=SC2034
          declare -gx VAR_AGE="true"
          # shellcheck disable=SC2034
-          declare -gx VAR_AGE_KEY="${1#*=}"
+          declare -gx VAR_AGE_KEY="${key_age}"
          shift 1
          ;;

        --key_luks=*)
+          declare key_luks="${1#*=}"
+          if ! validate_secret_filename "--key_luks" "${key_luks}"; then
+            if ! ${VAR_HANDLER_AUTOBUILD}; then boot_screen_cleaner; fi
+            exit "${ERR_ARG_MSMTCH}"
+          fi
          # shellcheck disable=SC2034
          declare -gx VAR_LUKS="true"
          # shellcheck disable=SC2034
-          declare -gx VAR_LUKS_KEY="${1#*=}"
+          declare -gx VAR_LUKS_KEY="${key_luks}"
          shift 1
          ;;

@@ -296,7 +313,7 @@ arg_parser() {
        --primordial-key)
          declare primordial_key="${2-}"

-          if [[ -n "${primordial_key}" && "${primordial_key}" != -* && "${primordial_key}" != "." && "${primordial_key}" != ".." && "${primordial_key}" != */* && "${primordial_key}" =~ ${primordial_key_regex} ]]; then
+          if validate_secret_filename "--primordial-key" "${primordial_key}"; then

            # shellcheck disable=SC2034
            declare -gx VAR_PRIMORDIAL_KEY="${primordial_key}"
@@ -315,7 +332,7 @@ arg_parser() {
        --primordial-key=*)
          declare primordial_key="${1#*=}"

-          if [[ -n "${primordial_key}" && "${primordial_key}" != "." && "${primordial_key}" != ".." && "${primordial_key}" != */* && "${primordial_key}" =~ ${primordial_key_regex} ]]; then
+          if validate_secret_filename "--primordial-key" "${primordial_key}"; then

            # shellcheck disable=SC2034
            declare -gx VAR_PRIMORDIAL_KEY="${primordial_key}"
@@ -461,7 +478,7 @@ arg_parser() {
          ;;

        --root-password-file)
-          declare pw_file="${2}"
+          declare pw_file="${2-}"

          if [[ -z "${pw_file}" ]]; then

@@ -473,10 +490,9 @@ arg_parser() {

          fi

-          if [[ ! -f "${pw_file}" ]]; then
+          if ! validate_secret_absolute_file_basics "--root-password-file" "${pw_file}"; then

            if ! ${VAR_HANDLER_AUTOBUILD}; then boot_screen_cleaner; fi
-            printf "\e[91m❌ Error: --root-password-file password file '%s' does not exist.\e[0m\n" "${pw_file}" >&2
            # shellcheck disable=SC2162
            read -p  $'\e[92m✅ Press \'ENTER\' to exit the script ... \e[0m'
            exit "${ERR_MISS_PWD_F}"
@@ -507,6 +523,13 @@ arg_parser() {
            }
          fi

+          validate_secret_file_path "--root-password-file" "${pw_file}" || {
+            if ! ${VAR_HANDLER_AUTOBUILD}; then boot_screen_cleaner; fi
+            # shellcheck disable=SC2162
+            read -p  $'\e[92m✅ Press \'ENTER\' to exit the script ... \e[0m'
+            exit "${ERR_RGHT_PWD_F}"
+          }
+
          declare plaintext_pw
          ### No tracing for security reasons ----------------------------------------------------------------------------------
          [[ "${VAR_EARLY_DEBUG}" == "true" ]] && set +x
@@ -606,16 +629,26 @@ arg_parser() {
          ;;

        --signing_ca=*)
+          declare signing_ca="${1#*=}"
+          if ! validate_secret_filename "--signing_ca" "${signing_ca}"; then
+            if ! ${VAR_HANDLER_AUTOBUILD}; then boot_screen_cleaner; fi
+            exit "${ERR_ARG_MSMTCH}"
+          fi
          # shellcheck disable=SC2034
-          declare -gx VAR_SIGNING_CA="${1#*=}"
+          declare -gx VAR_SIGNING_CA="${signing_ca}"
          shift 1
          ;;

        --signing_key=*)
+          declare signing_key="${1#*=}"
+          if ! validate_secret_filename "--signing_key" "${signing_key}"; then
+            if ! ${VAR_HANDLER_AUTOBUILD}; then boot_screen_cleaner; fi
+            exit "${ERR_ARG_MSMTCH}"
+          fi
          # shellcheck disable=SC2034
          declare -gx VAR_SIGNER="true"
          # shellcheck disable=SC2034
-          declare -gx VAR_SIGNING_KEY="${1#*=}"
+          declare -gx VAR_SIGNING_KEY="${signing_key}"
          shift 1
          ;;

@@ -626,8 +659,13 @@ arg_parser() {
          ;;

        --signing_key_pass=*)
+          declare signing_key_pass="${1#*=}"
+          if ! validate_secret_filename "--signing_key_pass" "${signing_key_pass}"; then
+            if ! ${VAR_HANDLER_AUTOBUILD}; then boot_screen_cleaner; fi
+            exit "${ERR_ARG_MSMTCH}"
+          fi
          # shellcheck disable=SC2034
-          declare -gx VAR_SIGNING_KEY_PASS="${1#*=}"
+          declare -gx VAR_SIGNING_KEY_PASS="${signing_key_pass}"
          shift 1
          ;;

@@ -694,8 +732,13 @@ arg_parser() {
          ;;

        --ssh-pubkey)
+          declare ssh_pubkey="${2-}"
+          if ! validate_ssh_pubkey_directory "${ssh_pubkey}"; then
+            if ! ${VAR_HANDLER_AUTOBUILD}; then boot_screen_cleaner; fi
+            exit "${ERR_ARG_MSMTCH}"
+          fi
          # shellcheck disable=SC2034
-          declare -gx VAR_SSHPUBKEY="${2}"
+          declare -gx VAR_SSHPUBKEY="${ssh_pubkey}"
          shift 2
          ;;

@@ -0,0 +1,318 @@
+#!/bin/bash
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2026-06-11; 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: 2024-2026; WEIDNER, Marc S.; <msw@coresecret.dev>
+# SPDX-FileType: SOURCE
+# SPDX-License-Identifier: LicenseRef-CNCL-1.1 OR LicenseRef-CCLA-1.1
+# 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
+# shellcheck disable=SC2154
+
+# Module overview:
+# This module centralizes build-directory safety checks for path validation, builder-ownership markers, and destructive cleanup
+# helpers. It keeps cleanup operations limited to canonical, explicitly validated build-directory paths.
+#
+# Function behavior:
+#   build_dir_safety_error(): writes a scoped build-directory safety error message to stderr.
+#   reject_broad_build_dir_path(): rejects the filesystem root and common top-level system directories as build targets.
+#   validate_build_dir_argument(): validates a non-empty absolute build-directory argument before the path is created.
+#   validate_existing_build_dir(): validates the argument and confirms that it resolves to an existing directory.
+#   require_builder_owned_build_dir(): requires a validated directory with a safe root-owned builder marker.
+#   ensure_builder_owned_build_dir(): creates the marker for a safe empty build directory or verifies an existing marker.
+#   require_builder_owned_subpath(): confirms that a target exists strictly below a verified builder-owned directory.
+#   safe_clean_build_dir_contents(): removes direct build-directory contents while preserving the builder marker.
+#   safe_remove_builder_subpath(): removes one verified subpath below a builder-owned build directory.
+
+guard_sourcing || return "${ERR_GUARD_SRCE}"
+
+#######################################
+# Print a cleanup/path safety error.
+# Globals:
+#   None
+# Arguments:
+#   1: Error detail.
+# Returns:
+#   0: on success
+#######################################
+build_dir_safety_error() {
+  declare detail="${1}"
+
+  printf "\e[91m❌ build directory safety: %s \e[0m\n" "${detail}" >&2
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f build_dir_safety_error
+
+#######################################
+# Reject broad parent directories as build-directory targets.
+# Globals:
+#   ERR_INVLD_CHAR
+# Arguments:
+#   1: Canonical path.
+# Returns:
+#   0: on success
+#   ERR_INVLD_CHAR: on failure
+#######################################
+reject_broad_build_dir_path() {
+  declare canonical_path="${1}"
+
+  case "${canonical_path}" in
+    "" | "/" | "/bin" | "/boot" | "/dev" | "/etc" | "/home" | "/lib" | "/lib64" | "/opt" | "/proc" | "/root" | "/run" | "/sbin" | "/sys" | "/tmp" | "/usr" | "/var")
+      build_dir_safety_error "refusing broad path."
+      return "${ERR_INVLD_CHAR}"
+      ;;
+    *)
+      ;;
+  esac
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f reject_broad_build_dir_path
+
+#######################################
+# Validate a build-directory argument before it is created.
+# Globals:
+#   ERR_INVLD_CHAR
+# Arguments:
+#   1: Build directory path.
+# Returns:
+#   0: on success
+#   ERR_INVLD_CHAR: on failure
+#######################################
+validate_build_dir_argument() {
+  declare build_dir="${1}" canonical_path=""
+
+  if [[ -z "${build_dir}" ]]; then
+    build_dir_safety_error "path MUST NOT be empty."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  if [[ "${build_dir}" != /* ]]; then
+    build_dir_safety_error "path MUST be absolute."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  if [[ -L "${build_dir}" ]]; then
+    build_dir_safety_error "path MUST NOT be a symlink."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  canonical_path="$(realpath -m -- "${build_dir}")"
+  reject_broad_build_dir_path "${canonical_path}" || return "${?}"
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f validate_build_dir_argument
+
+#######################################
+# Canonicalize and validate an existing build directory.
+# Globals:
+#   ERR_INVLD_CHAR
+# Arguments:
+#   1: Build directory path.
+# Returns:
+#   0: on success
+#   ERR_INVLD_CHAR: on failure
+#######################################
+validate_existing_build_dir() {
+  declare build_dir="${1}" canonical_path=""
+
+  validate_build_dir_argument "${build_dir}" || return "${?}"
+
+  if [[ ! -d "${build_dir}" ]]; then
+    build_dir_safety_error "path MUST be an existing directory."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  canonical_path="$(realpath -e -- "${build_dir}")"
+  reject_broad_build_dir_path "${canonical_path}" || return "$?"
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f validate_existing_build_dir
+
+#######################################
+# Validate the builder-owned marker in a build directory.
+# Globals:
+#   CISS_BUILD_DIR_MARKER
+#   ERR_INVLD_CHAR
+# Arguments:
+#   1: Build directory path.
+# Returns:
+#   0: on success
+#   ERR_INVLD_CHAR: on failure
+#######################################
+require_builder_owned_build_dir() {
+  declare build_dir="${1}" canonical_path="" marker_path="" marker_owner="" marker_mode="" marker_mode_octal=""
+
+  validate_existing_build_dir "${build_dir}" || return "$?"
+
+  canonical_path="$(realpath -e -- "${build_dir}")"
+  marker_path="${canonical_path}/${CISS_BUILD_DIR_MARKER}"
+
+  if [[ -L "${marker_path}" || ! -f "${marker_path}" ]]; then
+    build_dir_safety_error "builder-owned marker is missing or unsafe."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  marker_owner="$(stat -c '%u:%g' -- "${marker_path}")"
+  if [[ "${marker_owner}" != "0:0" ]]; then
+    build_dir_safety_error "builder-owned marker MUST be owned by root:root."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  marker_mode="$(stat -c '%a' -- "${marker_path}")"
+  marker_mode_octal=$((8#${marker_mode}))
+  if (( (marker_mode_octal & 022) != 0 )); then
+    build_dir_safety_error "builder-owned marker MUST NOT be group- or world-writable."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f require_builder_owned_build_dir
+
+#######################################
+# Create or preserve the builder-owned marker.
+# Globals:
+#   CISS_BUILD_DIR_MARKER
+#   ERR_INVLD_CHAR
+# Arguments:
+#   1: Build directory path.
+# Returns:
+#   0: on success
+#   ERR_INVLD_CHAR: on failure
+#######################################
+ensure_builder_owned_build_dir() {
+  declare build_dir="${1}" canonical_path="" marker_path=""
+
+  validate_existing_build_dir "${build_dir}" || return "${?}"
+
+  canonical_path="$(realpath -e -- "${build_dir}")"
+  marker_path="${canonical_path}/${CISS_BUILD_DIR_MARKER}"
+
+  if [[ -e "${marker_path}" || -L "${marker_path}" ]]; then
+    require_builder_owned_build_dir "${canonical_path}" || return "${?}"
+    return 0
+  fi
+
+  if [[ -d "${canonical_path}/.build" ]]; then
+    build_dir_safety_error "existing live-build state lacks the builder-owned marker."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  install -m 0600 -o root -g root /dev/null "${marker_path}"
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f ensure_builder_owned_build_dir
+
+#######################################
+# Validate that a target path is strictly below a builder-owned build directory.
+# Globals:
+#   ERR_INVLD_CHAR
+# Arguments:
+#   1: Build directory path.
+#   2: Target-path below the build directory.
+# Returns:
+#   0: on success
+#   ERR_INVLD_CHAR: on failure
+#######################################
+require_builder_owned_subpath() {
+  declare build_dir="${1}" target_path="${2}" build_real="" target_real=""
+
+  require_builder_owned_build_dir "${build_dir}" || return "$?"
+
+  if [[ -z "${target_path}" || -L "${target_path}" || ! -e "${target_path}" ]]; then
+    build_dir_safety_error "target subpath is empty, missing, or a symlink."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  build_real="$(realpath -e -- "${build_dir}")"
+  target_real="$(realpath -e -- "${target_path}")"
+
+  if [[ "${target_real}" == "${build_real}" ]]; then
+    build_dir_safety_error "target subpath MUST NOT be the build directory itself."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  case "${target_real}" in
+    "${build_real}"/*)
+      ;;
+    *)
+      build_dir_safety_error "target subpath MUST stay below the build directory."
+      return "${ERR_INVLD_CHAR}"
+      ;;
+  esac
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f require_builder_owned_subpath
+
+#######################################
+# Remove all contents of the exact builder-owned build directory.
+# Globals:
+#   CISS_BUILD_DIR_MARKER
+# Arguments:
+#   1: Build directory path.
+# Returns:
+#   0: on success
+#   Non-zero: on failure
+#######################################
+safe_clean_build_dir_contents() {
+  declare build_dir="${1}" build_real=""
+
+  require_builder_owned_build_dir "${build_dir}" || return "${?}"
+
+  build_real="$(realpath -e -- "${build_dir}")"
+
+  find "${build_real}" -mindepth 1 -maxdepth 1 -xdev ! -name "${CISS_BUILD_DIR_MARKER}" -exec rm -rf --one-file-system -- {} +
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f safe_clean_build_dir_contents
+
+#######################################
+# Remove one exact builder-owned subpath.
+# Globals:
+#   None
+# Arguments:
+#   1: Build-directory-path.
+#   2: Target-path below build-directory.
+# Returns:
+#   0: on success
+#   Non-zero: on failure
+#######################################
+safe_remove_builder_subpath() {
+  declare build_dir="${1}" target_path="${2}" target_real=""
+
+  require_builder_owned_subpath "${build_dir}" "${target_path}" || return "${?}"
+
+  target_real="$(realpath -e -- "${target_path}")"
+  rm -rf --one-file-system -- "${target_real}"
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f safe_remove_builder_subpath
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
@@ -33,12 +33,16 @@ x_remove() {

  shopt -s nullglob dotglob

+  ### Collect exact currently available secret values before removing their source files.
+  ### Log rewriting is intentionally deferred to the final trap after xtrace has been stopped.
+  collect_debug_secret_values || true
+
  if [[ "${VAR_SIGNER}" == "true" ]]; then

    # shellcheck disable=SC2312
    find "${VAR_TMP_SECRET}" -xdev -type f \
-      ! -path "${VAR_TMP_SECRET}/signing_key_pass.txt" \
-      ! -path "${VAR_TMP_SECRET}/luks.txt" \
+      ! -path "${VAR_TMP_SECRET}/${VAR_SIGNING_KEY_PASS:-signing_key_pass.txt}" \
+      ! -path "${VAR_TMP_SECRET}/${VAR_LUKS_KEY:-luks.txt}" \
      -print0 \
      | xargs -0 --no-run-if-empty shred -fzu -n 5 --

@@ -1,4 +1,5 @@
 #!/bin/bash
+# shellcheck disable=SC2154
 # 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
@@ -14,9 +15,10 @@ guard_sourcing || return "${ERR_GUARD_SRCE}"

 #######################################
 # Integrates and generates sha512sum and GPG signatures on CISS specific LIVE boot artifacts:
-#  - /root/.ciss/attestation/VAR_SIGNING_KEY_FPR.*
+#  - /root/.ciss/attestation/VAR_SIGNING_KEY_FPR.* legacy-signed public-key copy, not rootfs content attestation
 #  - /etc/initramfs-tools/files/unlock_wrapper.sh
 #  - /usr/lib/live/boot/0030-ciss-verify-checksums
+# Rootfs content attestation for the final SquashFS payload is generated by zzzz_ciss_crypt_squash.hook.binary.
 # Globals:
 #   BASH_SOURCE
 #   VAR_HANDLER_BUILD_DIR
@@ -33,6 +33,7 @@ guard_sourcing || return "${ERR_GUARD_SRCE}"
 #######################################
 clean_up() {
  declare clean_exit_code="$1" fs_type="" _old_nullglob="" _old_dotglob="" _old_failglob=""
+  declare build_dir_valid="false" includes_chroot=""

  ### Enable nullglob/dotglob, disable failglob for safe globbing.
  _old_nullglob="$(shopt -p nullglob || true)"
@@ -52,10 +53,10 @@ clean_up() {
  rm -f -- "${VAR_NOTES}"

  ### Release advisory lock on FD 127.
-  flock -u 127
+  flock -u 127 2>/dev/null || true

  ### Close file descriptor 127.
-  exec 127>&-
+  exec 127>&- 2>/dev/null || true

  ### Remove the lockfile artifact.
  rm -f /run/lock/ciss_live_builder.lock
@@ -100,32 +101,46 @@ clean_up() {
  ### No tracing for security reasons ------------------------------------------------------------------------------------------
  [[ "${VAR_EARLY_DEBUG}" == "true" ]] && set +x

-  ### Removes secrets securely.
-  # shellcheck disable=SC2312
-  find "${VAR_TMP_SECRET}" -xdev -type f -print0 | xargs -0 --no-run-if-empty shred -fzu -n 5 --
-  find "${VAR_TMP_SECRET}" -xdev -depth -type d -empty -delete
+  ### Stop xtrace before destructive cleanup and collect still-available exact secret values.
+  ### The final log rewrite runs later from the trap after no further debug/error log writes are expected.
+  finalize_debug_xtrace_logging || true
+  collect_debug_secret_values || true

-  ### Securely shred all regular files below ./includes.chroot, then remove empty dirs.
-  if [[ -d "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot" ]]; then
+  ### Removes secrets securely.
+  if [[ -n "${VAR_TMP_SECRET:-}" && -d "${VAR_TMP_SECRET}" && ! -L "${VAR_TMP_SECRET}" ]]; then

    # shellcheck disable=SC2312
-    find "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot" -xdev -type f -print0 | xargs -0 --no-run-if-empty shred -fzu -n 5 --
+    find "${VAR_TMP_SECRET}" -xdev -type f -print0 | xargs -0 --no-run-if-empty shred -fzu -n 5 -- || true
+    find "${VAR_TMP_SECRET}" -xdev -depth -type d -empty -delete || true
+
+  fi
+
+  if [[ -n "${VAR_HANDLER_BUILD_DIR:-}" && -d "${VAR_HANDLER_BUILD_DIR}" ]]; then
+    if require_builder_owned_build_dir "${VAR_HANDLER_BUILD_DIR}"; then
+      build_dir_valid="true"
+    fi
+  fi
+
+  ### Securely shred all regular files below ./includes.chroot, then remove empty dirs.
+  includes_chroot="${VAR_HANDLER_BUILD_DIR:-}/config/includes.chroot"
+  if [[ "${build_dir_valid}" == "true" && -d "${includes_chroot}" ]] \
+    && require_builder_owned_subpath "${VAR_HANDLER_BUILD_DIR}" "${includes_chroot}"; then
+
+    # shellcheck disable=SC2312
+    find "${includes_chroot}" -xdev -type f -print0 | xargs -0 --no-run-if-empty shred -fzu -n 5 -- || true

    ### Remove empty directories (bottom-up).
-    find "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot" -depth -xdev -type d -empty -delete
+    find "${includes_chroot}" -depth -xdev -type d -empty -delete || true

  fi

  ### Delete all files and directories below ./chroot.
-  if [[ -d "${VAR_HANDLER_BUILD_DIR}/chroot" ]]; then
+  if [[ "${build_dir_valid}" == "true" && -d "${VAR_HANDLER_BUILD_DIR}/chroot" ]]; then

-    rm -rf "${VAR_HANDLER_BUILD_DIR}/chroot"
+    safe_remove_builder_subpath "${VAR_HANDLER_BUILD_DIR}" "${VAR_HANDLER_BUILD_DIR}/chroot" || true

  fi

-  ### Turn on tracing again ----------------------------------------------------------------------------------------------------
-  [[ "${VAR_EARLY_DEBUG}" == "true" ]] && set -x
-
  eval "${_old_nullglob}" 2>/dev/null || true
  eval "${_old_dotglob}"  2>/dev/null || true
  eval "${_old_failglob}" 2>/dev/null || true
@@ -0,0 +1,297 @@
+#!/bin/bash
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2026-06-11; 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: 2024-2026; WEIDNER, Marc S.; <msw@coresecret.dev>
+# SPDX-FileType: SOURCE
+# SPDX-License-Identifier: LicenseRef-CNCL-1.1 OR LicenseRef-CCLA-1.1
+# 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
+# shellcheck disable=SC2154
+
+# Function behavior:
+#   debug_sanitize_escape_glob(): Escape Bash glob metacharacters so exact values can be used safely in parameter-substitution matches.
+#   debug_sanitize_read_file(): Read a text file into a named variable while preserving trailing newline bytes.
+#   debug_sanitize_add_secret(): Add one non-empty exact secret value to the in-memory redaction list, avoiding duplicates.
+#   debug_sanitize_add_secret_file(): Add the exact content of a regular, non-symlink secret file to the redaction list.
+#   debug_sanitize_collect_secrets(): Add controlled secret variables and secret-file contents to the redaction list.
+#   collect_debug_secret_values(): Collect exact secret values while xtrace is temporarily disabled.
+#   finalize_debug_xtrace_logging(): Permanently disable xtrace and close the xtrace log FD before rewriting logs.
+#   debug_sanitize_log_file(): Redact collected exact secret values from one log file and restrict its permissions.
+#   sanitize_debug_logs(): Run the final exact-value sanitization pass across closed debug, variable, and error logs.
+
+guard_sourcing || return "${ERR_GUARD_SRCE}"
+
+declare -ga _ARY_DEBUG_SECRET_VALUES=()
+declare -g  _VAR_DEBUG_XTRACE_FINALIZED="false"
+
+#######################################
+# Escape Bash glob metacharacters for exact parameter-substitution matching.
+# Globals:
+#   None
+# Arguments:
+#   1: Raw value.
+# Returns:
+#   0: on success
+#######################################
+debug_sanitize_escape_glob() {
+  declare value="${1}"
+
+  value="${value//\\/\\\\}"
+  value="${value//\*/\\*}"
+  value="${value//\?/\\?}"
+  value="${value//\[/\\[}"
+  value="${value//\]/\\]}"
+
+  printf '%s' "${value}"
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f debug_sanitize_escape_glob
+
+#######################################
+# Read a text file into a variable, preserving trailing newlines.
+# Globals:
+#   None
+# Arguments:
+#   1: File path.
+#   2: Output variable name.
+# Returns:
+#   0: on success
+#######################################
+debug_sanitize_read_file() {
+  declare file_path="${1}" output_var="${2}" content=""
+
+  IFS= read -r -d '' content < "${file_path}" || true
+  printf -v "${output_var}" '%s' "${content}"
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f debug_sanitize_read_file
+
+#######################################
+# Add one exact secret value to the redaction list.
+# Globals:
+#   _ARY_DEBUG_SECRET_VALUES
+# Arguments:
+#   1: Secret value.
+# Returns:
+#   0: on success
+#######################################
+debug_sanitize_add_secret() {
+  declare secret_value="${1}" known_value=""
+
+  [[ -n "${secret_value}" ]] || return 0
+
+  for known_value in "${_ARY_DEBUG_SECRET_VALUES[@]:-}"; do
+    [[ "${known_value}" == "${secret_value}" ]] && return 0
+  done
+
+  _ARY_DEBUG_SECRET_VALUES+=("${secret_value}")
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f debug_sanitize_add_secret
+
+#######################################
+# Add a secret file's exact content to the redaction list.
+# Globals:
+#   _ARY_DEBUG_SECRET_VALUES
+# Arguments:
+#   1: File path.
+# Returns:
+#   0: on success
+#######################################
+debug_sanitize_add_secret_file() {
+  declare file_path="${1}" secret_value=""
+
+  [[ -n "${file_path}" && -f "${file_path}" && ! -L "${file_path}" ]] || return 0
+  [[ -s "${file_path}" ]] || return 0
+
+  debug_sanitize_read_file "${file_path}" secret_value
+  debug_sanitize_add_secret "${secret_value}"
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f debug_sanitize_add_secret_file
+
+#######################################
+# Gather exact values from controlled secret variables and files.
+# Globals:
+#   _ARY_DEBUG_SECRET_VALUES
+#   VAR_HASHED_PWD
+#   VAR_SIGNING_KEY_PASSFILE
+#   VAR_TMP_SECRET
+# Arguments:
+#   None
+# Returns:
+#   0: on success
+#######################################
+debug_sanitize_collect_secrets() {
+  declare secret_file=""
+
+  if [[ -n "${VAR_HASHED_PWD:-}" ]]; then
+    debug_sanitize_add_secret "${VAR_HASHED_PWD}"
+  fi
+
+  if [[ -n "${VAR_SIGNING_KEY_PASSFILE:-}" ]]; then
+    debug_sanitize_add_secret_file "${VAR_SIGNING_KEY_PASSFILE}"
+  fi
+
+  if [[ -n "${VAR_TMP_SECRET:-}" && -d "${VAR_TMP_SECRET}" && ! -L "${VAR_TMP_SECRET}" ]]; then
+    while IFS= read -r -d '' secret_file; do
+      debug_sanitize_add_secret_file "${secret_file}"
+    done < <(find "${VAR_TMP_SECRET}" -xdev -type f -print0 2>/dev/null || true)
+  fi
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f debug_sanitize_collect_secrets
+
+#######################################
+# Collect exact secret values without tracing secret-bearing operations.
+# Globals:
+#   _VAR_DEBUG_XTRACE_FINALIZED
+# Arguments:
+#   None
+# Returns:
+#   0: on success
+#######################################
+collect_debug_secret_values() {
+  declare tracing_was_enabled="false"
+
+  case "$-" in
+    *x*)
+      tracing_was_enabled="true"
+      set +x
+      ;;
+    *)
+      ;;
+  esac
+
+  debug_sanitize_collect_secrets || true
+
+  if [[ "${tracing_was_enabled}" == "true" && "${_VAR_DEBUG_XTRACE_FINALIZED}" != "true" ]]; then
+    set -x
+  fi
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f collect_debug_secret_values
+
+#######################################
+# Permanently stop xtrace logging before the final log rewrite.
+# Globals:
+#   BASH_XTRACEFD
+#   _VAR_DEBUG_XTRACE_FINALIZED
+# Arguments:
+#   None
+# Returns:
+#   0: on success
+#######################################
+finalize_debug_xtrace_logging() {
+  declare xtrace_fd=""
+
+  set +x
+
+  if [[ "${BASH_XTRACEFD:-}" =~ ^[0-9]+$ ]]; then
+    xtrace_fd="${BASH_XTRACEFD}"
+    unset BASH_XTRACEFD
+
+    if (( xtrace_fd > 2 )); then
+      exec {xtrace_fd}>&- 2>/dev/null || true
+    fi
+  fi
+
+  _VAR_DEBUG_XTRACE_FINALIZED="true"
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f finalize_debug_xtrace_logging
+
+#######################################
+# Redact exact secret values from one log file.
+# Globals:
+#   _ARY_DEBUG_SECRET_VALUES
+# Arguments:
+#   1: Log file path.
+# Returns:
+#   0: on success
+#######################################
+debug_sanitize_log_file() {
+  declare log_file="${1}" log_content="" secret_value="" secret_pattern="" redaction=""
+  declare -i secret_len=0
+
+  [[ -n "${log_file}" && -f "${log_file}" && ! -L "${log_file}" ]] || return 0
+
+  debug_sanitize_read_file "${log_file}" log_content
+
+  for secret_value in "${_ARY_DEBUG_SECRET_VALUES[@]:-}"; do
+
+    [[ -n "${secret_value}" ]] || continue
+
+    secret_pattern="$(debug_sanitize_escape_glob "${secret_value}")"
+    secret_len="${#secret_value}"
+    printf -v redaction '%*s' "${secret_len}" ''
+    redaction="${redaction// /*}"
+    log_content="${log_content//${secret_pattern}/${redaction}}"
+
+  done
+
+  printf '%s' "${log_content}" >| "${log_file}"
+  chmod 0600 "${log_file}" 2>/dev/null || true
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f debug_sanitize_log_file
+
+#######################################
+# Final exact-value debug log sanitization pass.
+# Globals:
+#   LOG_DEBUG
+#   LOG_ERROR
+#   LOG_VAR
+# Arguments:
+#   None
+# Returns:
+#   0: on success
+#######################################
+sanitize_debug_logs() {
+  declare old_lc_all="${LC_ALL:-}" log_file=""
+
+  finalize_debug_xtrace_logging || true
+
+  LC_ALL=C
+
+  debug_sanitize_collect_secrets || true
+
+  for log_file in "${LOG_DEBUG:-}" "${LOG_VAR:-}" "${LOG_ERROR:-}"; do
+    debug_sanitize_log_file "${log_file}" || true
+  done
+
+  LC_ALL="${old_lc_all}"
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f sanitize_debug_logs
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
@@ -72,9 +72,15 @@ EOF

    fi

-    ### Use pubring as verification keyring reference.
+    ### Use pubring as a verification keyring reference.
    declare -grx VAR_VERIFY_KEYRING="${GNUPGHOME}/pubring.kbx"

+    validate_secret_file_in_root "--signing_key" "${VAR_SIGNING_KEY}" || return "${?}"
+    validate_secret_file_in_root "--signing_key_pass" "${VAR_SIGNING_KEY_PASS}" || return "${?}"
+    if [[ -n "${VAR_SIGNING_CA}" ]]; then
+      validate_secret_file_in_root "--signing_ca" "${VAR_SIGNING_CA}" || return "${?}"
+    fi
+
    declare -grx VAR_SIGNING_KEY_PASSFILE="${VAR_TMP_SECRET}/${VAR_SIGNING_KEY_PASS}"

    ### No tracing for security reasons ------------------------------------------------------------------------------------------
@@ -182,6 +182,7 @@ hardening_ultra() {
  printf "\e[95m🧪 Updating SSH Keys, Ports ... \e[0m\n"

  ### ./config/includes.chroot/root/.ssh ---------------------------------------------------------------------------------------
+  validate_ssh_pubkey_directory "${VAR_SSHPUBKEY}" || return "${?}"
  install -d -m 0700 "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.ssh"
  install -m 0600 -o root -g root "${VAR_SSHPUBKEY}/authorized_keys" "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.ssh/"

@@ -30,12 +30,14 @@ lb_config_start() {
    mkdir -p "${VAR_HANDLER_BUILD_DIR}"
    # shellcheck disable=SC2164
    cd "${VAR_HANDLER_BUILD_DIR}"
+    ensure_builder_owned_build_dir "${VAR_HANDLER_BUILD_DIR}"
    printf "\e[92m✅ '%s' created. \e[0m\n" "${VAR_HANDLER_BUILD_DIR}"

  else

    # shellcheck disable=SC2164
    cd "${VAR_HANDLER_BUILD_DIR}"
+    ensure_builder_owned_build_dir "${VAR_HANDLER_BUILD_DIR}"

  fi

@@ -48,11 +50,7 @@ lb_config_start() {

    lb clean --binary --cache --purge --source

-    if [[ "${PWD}" == "${VAR_HANDLER_BUILD_DIR}" && "${PWD}" != "/" && -n "${PWD}" ]]; then
-
-      rm -rf -- ./* ./.??*
-
-    fi
+    safe_clean_build_dir_contents "${VAR_HANDLER_BUILD_DIR}"

    printf "\e[92m✅ Deleting former config, binary and cache done.\e[0m\n"

@@ -84,6 +84,8 @@ init_primordial() {
  ### Check for SOPS AGE key integration ---------------------------------------------------------------------------------------
  if [[ "${VAR_AGE,,}" == "true" ]]; then

+    validate_secret_file_in_root "--key_age" "${VAR_AGE_KEY}" || return "$?"
+
    install -d -m 0700                                 "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.config/sops/age"
    install -m 0400 "${VAR_TMP_SECRET}/${VAR_AGE_KEY}" "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.config/sops/age/keys.txt"
    shred -fzu -n 5 -- "${VAR_TMP_SECRET}/${VAR_AGE_KEY}" 2>/dev/null || rm -f "${VAR_TMP_SECRET}/${VAR_AGE_KEY}"
@@ -93,6 +95,18 @@ init_primordial() {
  ### Check for SSH CISS and PhysNet Primordial-Workflow™ integration -------------------------------------------------------
  if [[ "${VAR_SSHFP,,}" == "true" ]]; then

+    # shellcheck disable=SC2312
+    if find "${VAR_TMP_SECRET}" -xdev \( -name 'id*' -o -name 'ssh_host_*' \) -type l -print -quit | grep -q .; then
+      printf "\e[91m❌ ERROR: SSH identity and host key inputs MUST NOT be symlinks. \e[0m\n" >&2
+      return "${ERR_INVLD_CHAR}"
+    fi
+
+    # shellcheck disable=SC2312
+    if find "${VAR_TMP_SECRET}" -xdev \( -name 'id*' -o -name 'ssh_host_*' \) ! -type f -print -quit | grep -q .; then
+      printf "\e[91m❌ ERROR: SSH identity and host key inputs MUST be regular files. \e[0m\n" >&2
+      return "${ERR_INVLD_CHAR}"
+    fi
+
    install -d -m 0700                      "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.ssh"
    install -m 0600 "${VAR_TMP_SECRET}/id"* "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.ssh/"
    normalize_ssh_keys_in_dir               "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.ssh"
@@ -0,0 +1,406 @@
+#!/bin/bash
+# SPDX-Version: 3.0
+# SPDX-CreationInfo: 2026-06-11; WEIDNER, Marc S.; <msw@coresecret.dev>
+# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.git
+# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
+# SPDX-FileCopyrightText: 2024-2026; WEIDNER, Marc S.; <msw@coresecret.dev>
+# SPDX-FileType: SOURCE
+# SPDX-License-Identifier: LicenseRef-CNCL-1.1 OR LicenseRef-CCLA-1.1
+# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
+# SPDX-PackageName: CISS.debian.live.builder
+# SPDX-Security-Contact: security@coresecret.eu
+# shellcheck disable=SC2154
+
+guard_sourcing || return "${ERR_GUARD_SRCE}"
+
+#######################################
+# Print a validation error without echoing secret values.
+# Globals:
+#   None
+# Arguments:
+#   1: Validation label.
+#   2: Error detail.
+# Returns:
+#   0: on success
+#######################################
+secret_validation_error() {
+  declare label="$1" detail="$2"
+
+  printf "\e[91mERROR: %s: %s\e[0m\n" "${label}" "${detail}" >&2
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f secret_validation_error
+
+#######################################
+# Validate a filename-only secret argument.
+# Globals:
+#   ERR_ARG_MSMTCH
+# Arguments:
+#   1: Validation label.
+#   2: Filename.
+# Returns:
+#   0: on success
+#   ERR_ARG_MSMTCH: on failure
+#######################################
+validate_secret_filename() {
+  declare label="$1" filename="$2"
+  declare filename_regex='^[A-Za-z0-9._@%+=:,~-]+$'
+
+  if [[ -z "${filename}" ]]; then
+    secret_validation_error "${label}" "filename MUST NOT be empty."
+    return "${ERR_ARG_MSMTCH}"
+  fi
+
+  if [[ "${filename}" == "." || "${filename}" == ".." ]]; then
+    secret_validation_error "${label}" "filename MUST NOT be '.' or '..'."
+    return "${ERR_ARG_MSMTCH}"
+  fi
+
+  if [[ "${filename}" == -* ]]; then
+    secret_validation_error "${label}" "filename MUST NOT start with '-'."
+    return "${ERR_ARG_MSMTCH}"
+  fi
+
+  if [[ "${filename}" == */* || "${filename}" == *\\* ]]; then
+    secret_validation_error "${label}" "filename MUST NOT contain path separators."
+    return "${ERR_ARG_MSMTCH}"
+  fi
+
+  if [[ ! "${filename}" =~ ${filename_regex} ]]; then
+    secret_validation_error "${label}" "filename contains unsupported characters."
+    return "${ERR_ARG_MSMTCH}"
+  fi
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f validate_secret_filename
+
+#######################################
+# Validate the fixed tmpfs secret root.
+# Globals:
+#   ERR_INVLD_CHAR
+# Arguments:
+#   1: Secret root path.
+# Returns:
+#   0: on success
+#   ERR_INVLD_CHAR: on failure
+#######################################
+validate_secret_root() {
+  declare secret_root="$1" root_owner="" root_mode="" root_mode_octal="" root_fs=""
+
+  if [[ -z "${secret_root}" ]]; then
+    secret_validation_error "secret root" "path MUST NOT be empty."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  if [[ -L "${secret_root}" ]]; then
+    secret_validation_error "secret root" "path MUST NOT be a symlink."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  if [[ ! -d "${secret_root}" ]]; then
+    secret_validation_error "secret root" "path MUST be an existing directory."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  root_owner="$(stat -c '%u:%g' -- "${secret_root}")"
+  if [[ "${root_owner}" != "0:0" ]]; then
+    secret_validation_error "secret root" "directory MUST be owned by root:root."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  root_mode="$(stat -c '%a' -- "${secret_root}")"
+  root_mode_octal=$((8#${root_mode}))
+  if (( (root_mode_octal & 077) != 0 || (root_mode_octal & 0700) != 0700 )); then
+    secret_validation_error "secret root" "directory mode MUST be 0700 or stricter."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  root_fs="$(stat -f -c '%T' -- "${secret_root}")"
+  if [[ "${root_fs}" != "tmpfs" && "${root_fs}" != "ramfs" ]]; then
+    secret_validation_error "secret root" "directory MUST be backed by tmpfs or ramfs."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  # shellcheck disable=SC2312
+  if find "${secret_root}" -xdev -type l -print -quit | grep -q .; then
+    secret_validation_error "secret root" "secret tree MUST NOT contain symlinks."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  # shellcheck disable=SC2312
+  if find "${secret_root}" -xdev \( -type b -o -type c -o -type p -o -type s \) -print -quit | grep -q .; then
+    secret_validation_error "secret root" "secret tree MUST NOT contain special files."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f validate_secret_root
+
+#######################################
+# Normalize ownership and mode of regular files in the secret root.
+# Globals:
+#   ERR_INVLD_CHAR
+# Arguments:
+#   1: Secret root path.
+# Returns:
+#   0: on success
+#   ERR_INVLD_CHAR: on failure
+#######################################
+harden_secret_root_files() {
+  declare secret_root="$1"
+
+  validate_secret_root "${secret_root}" || return "$?"
+
+  find "${secret_root}" -xdev -type f -exec chown root:root -- {} +
+  find "${secret_root}" -xdev -type f -exec chmod 0400 -- {} +
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f harden_secret_root_files
+
+#######################################
+# Validate that an existing absolute path is a regular non-symlink file.
+# Globals:
+#   ERR_INVLD_CHAR
+# Arguments:
+#   1: Validation label.
+#   2: File path.
+# Returns:
+#   0: on success
+#   ERR_INVLD_CHAR: on failure
+#######################################
+validate_secret_absolute_file_basics() {
+  declare label="$1" file_path="$2"
+
+  if [[ -z "${file_path}" ]]; then
+    secret_validation_error "${label}" "file path MUST NOT be empty."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  if [[ "${file_path}" != /* ]]; then
+    secret_validation_error "${label}" "file path MUST be absolute."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  if [[ -L "${file_path}" ]]; then
+    secret_validation_error "${label}" "file MUST NOT be a symlink."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  if [[ ! -f "${file_path}" ]]; then
+    secret_validation_error "${label}" "file MUST be an existing regular file."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f validate_secret_absolute_file_basics
+
+#######################################
+# Validate a strict secret file.
+# Globals:
+#   ERR_INVLD_CHAR
+# Arguments:
+#   1: Validation label.
+#   2: File path.
+# Returns:
+#   0: on success
+#   ERR_INVLD_CHAR: on failure
+#######################################
+validate_secret_file_path() {
+  declare label="$1" file_path="$2" file_owner="" file_mode="" file_mode_octal=""
+
+  validate_secret_absolute_file_basics "${label}" "${file_path}" || return "$?"
+
+  file_owner="$(stat -c '%u:%g' -- "${file_path}")"
+  if [[ "${file_owner}" != "0:0" ]]; then
+    secret_validation_error "${label}" "file MUST be owned by root:root."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  file_mode="$(stat -c '%a' -- "${file_path}")"
+  file_mode_octal=$((8#${file_mode}))
+  if (( (file_mode_octal & 077) != 0 || (file_mode_octal & 0400) != 0400 )); then
+    secret_validation_error "${label}" "file mode MUST allow root read and no group/other access."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f validate_secret_file_path
+
+#######################################
+# Validate a filename-only secret stored below the fixed secret root.
+# Globals:
+#   VAR_TMP_SECRET
+# Arguments:
+#   1: Validation label.
+#   2: Filename.
+# Returns:
+#   0: on success
+#   Non-zero: on failure
+#######################################
+validate_secret_file_in_root() {
+  declare label="$1" filename="$2"
+
+  validate_secret_filename "${label}" "${filename}" || return "$?"
+  validate_secret_file_path "${label}" "${VAR_TMP_SECRET}/${filename}" || return "$?"
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f validate_secret_file_in_root
+
+#######################################
+# Validate a public input file copied into the ISO.
+# Globals:
+#   ERR_INVLD_CHAR
+# Arguments:
+#   1: Validation label.
+#   2: File path.
+# Returns:
+#   0: on success
+#   ERR_INVLD_CHAR: on failure
+#######################################
+validate_public_input_file() {
+  declare label="$1" file_path="$2" file_owner="" file_mode="" file_mode_octal=""
+
+  validate_secret_absolute_file_basics "${label}" "${file_path}" || return "$?"
+
+  file_owner="$(stat -c '%u:%g' -- "${file_path}")"
+  if [[ "${file_owner}" != "0:0" ]]; then
+    secret_validation_error "${label}" "file MUST be owned by root:root."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  file_mode="$(stat -c '%a' -- "${file_path}")"
+  file_mode_octal=$((8#${file_mode}))
+  if (( (file_mode_octal & 022) != 0 )); then
+    secret_validation_error "${label}" "file MUST NOT be group- or world-writable."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f validate_public_input_file
+
+#######################################
+# Validate the authorized_keys directory.
+# Globals:
+#   ERR_INVLD_CHAR
+# Arguments:
+#   1: Directory path.
+# Returns:
+#   0: on success
+#   ERR_INVLD_CHAR: on failure
+#######################################
+validate_ssh_pubkey_directory() {
+  declare key_dir="$1" key_file="" dir_owner="" dir_mode="" dir_mode_octal=""
+
+  if [[ -z "${key_dir}" ]]; then
+    secret_validation_error "--ssh-pubkey" "directory path MUST NOT be empty."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  if [[ "${key_dir}" != /* ]]; then
+    secret_validation_error "--ssh-pubkey" "directory path MUST be absolute."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  if [[ -L "${key_dir}" ]]; then
+    secret_validation_error "--ssh-pubkey" "directory MUST NOT be a symlink."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  if [[ ! -d "${key_dir}" ]]; then
+    secret_validation_error "--ssh-pubkey" "directory MUST exist."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  dir_owner="$(stat -c '%u:%g' -- "${key_dir}")"
+  if [[ "${dir_owner}" != "0:0" ]]; then
+    secret_validation_error "--ssh-pubkey" "directory MUST be owned by root:root."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  dir_mode="$(stat -c '%a' -- "${key_dir}")"
+  dir_mode_octal=$((8#${dir_mode}))
+  if (( (dir_mode_octal & 022) != 0 )); then
+    secret_validation_error "--ssh-pubkey" "directory MUST NOT be group- or world-writable."
+    return "${ERR_INVLD_CHAR}"
+  fi
+
+  key_file="${key_dir}/authorized_keys"
+  validate_public_input_file "--ssh-pubkey authorized_keys" "${key_file}" || return "$?"
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f validate_ssh_pubkey_directory
+
+#######################################
+# Validate all selected secret inputs after argument parsing.
+# Globals:
+#   VAR_AGE
+#   VAR_AGE_KEY
+#   VAR_LUKS
+#   VAR_LUKS_KEY
+#   VAR_SIGNER
+#   VAR_SIGNING_CA
+#   VAR_SIGNING_KEY
+#   VAR_SIGNING_KEY_PASS
+#   VAR_SSHPUBKEY
+#   VAR_TMP_SECRET
+# Arguments:
+#   None
+# Returns:
+#   0: on success
+#   Non-zero: on failure
+#######################################
+validate_selected_secret_inputs() {
+  if [[ "${VAR_AGE,,}" == "true" ]]; then
+    validate_secret_file_in_root "--key_age" "${VAR_AGE_KEY}" || return "$?"
+  fi
+
+  if [[ "${VAR_LUKS,,}" == "true" ]]; then
+    validate_secret_file_in_root "--key_luks" "${VAR_LUKS_KEY}" || return "$?"
+  fi
+
+  if [[ "${VAR_SIGNER,,}" == "true" ]]; then
+    validate_secret_file_in_root "--signing_key" "${VAR_SIGNING_KEY}" || return "$?"
+    validate_secret_file_in_root "--signing_key_pass" "${VAR_SIGNING_KEY_PASS}" || return "$?"
+  fi
+
+  if [[ -n "${VAR_SIGNING_CA:-}" ]]; then
+    validate_secret_file_in_root "--signing_ca" "${VAR_SIGNING_CA}" || return "$?"
+  fi
+
+  if [[ -n "${VAR_SSHPUBKEY:-}" ]]; then
+    validate_ssh_pubkey_directory "${VAR_SSHPUBKEY}" || return "$?"
+  fi
+
+  return 0
+}
+### Prevents accidental 'unset -f'.
+# shellcheck disable=SC2034
+readonly -f validate_selected_secret_inputs
+# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
@@ -49,6 +49,8 @@ trap_on_exit() {

    print_scr_exit "${errcode}"

+    sanitize_debug_logs || true
+
    exit "${errcode}"

  else
@@ -63,6 +65,8 @@ trap_on_exit() {

    fi

+    sanitize_debug_logs || true
+
    exit "${errcode}"

  fi
@@ -39,13 +39,13 @@ usage() {
  # shellcheck disable=SC2155
  declare var_header=$(center "CDLB(1)                        CISS.debian.live.builder                        CDLB(1)" "${var_cols}")
  # shellcheck disable=SC2155
-  declare var_footer=$(center "V9.14.022.2026.06.10                        2026-06-10                         CDLB(1)" "${var_cols}")
+  declare var_footer=$(center "${VAR_VERSION}                        2026-06-11                         CDLB(1)" "${var_cols}")

  {
    echo -e "\e[1;97m${var_header}\e[0m"
    echo
    echo -e "\e[92mCISS.debian.live.builder from https://git.coresecret.dev/msw \e[0m"
-    echo -e "\e[92mMaster V9.14.022.2026.06.10\e[0m"
+    echo -e "\e[92mMaster ${VAR_VERSION}\e[0m"
    echo -e "\e[92mA lightweight Shell Wrapper for building a hardened Debian Live ISO Image.\e[0m"
    echo
    echo -e "\e[97m(c) Marc S. Weidner, 2018 - 2026 \e[0m"
@@ -67,6 +67,7 @@ usage() {
    echo
    echo -e "\e[97m  --build-directory </path/to/build_directory> \e[0m"
    echo "    Where the Debian Live Build Image should be generated. RECOMMENDED path: </opt/cdlb>"
+    echo "    Cleanup is destructive inside the exact builder-owned path and requires '.ciss-live-builder-owned'."
    echo "    MUST be provided."
    echo
    echo -e "\e[97m  --change-splash <STRING> one of <club | hexagon> \e[0m"
@@ -77,6 +78,9 @@ usage() {
    echo "    This option creates a boot menu entry that starts the forthcoming 'CISS.debian.installer', which is executed"
    echo "    once the system has successfully booted up."
    echo
+    echo -e "\e[97m  --cicd \e[0m"
+    echo "    Only for CISS internal Gitea Action Runners"
+    echo
    echo -e "\e[97m  --contact, -c \e[0m"
    echo "    Show author contact information."
    echo
@@ -87,6 +91,7 @@ usage() {
    echo -e "\e[97m  --debug, -d \e[0m"
    echo "    Enables debug logging for the main program routine. Detailed logging information are written to:"
    echo "    </tmp/ciss_live_builder_$$.log>"
+    echo "    After xtrace is stopped and its debug FD is closed, a final exact-value redaction pass sanitizes logs."
    echo
    echo -e "\e[97m  --dhcp-centurion \e[0m"
    echo "    If a DHCP lease is provided, the provider's name server will be overridden and the hardened, privacy-focused "
@@ -108,14 +113,17 @@ usage() {
    echo
    echo -e "\e[97m  --key_age=* \e[0m"
    echo "    The SOPS AGE private keyring for decryption operations. Change '*' to your desired SOPS AGE key file."
-    echo "    File MUST be placed in:"
+    echo "    This MUST be a filename only and MUST be placed in the root-owned tmpfs secret root:"
    echo "    </dev/shm/cdlb_secrets>"
    echo
    echo -e "\e[97m  --key_luks=* \e[0m"
    echo "    The LUKS encryption / decryption passphrase for '/'-fs-encryption. Change '*' to your desired passphrase file."
-    echo "    File MUST be placed in:"
+    echo "    This MUST be a filename only and MUST be placed in the root-owned tmpfs secret root:"
    echo "    </dev/shm/cdlb_secrets>"
    echo
+    echo -e "\e[97m  --logo, -l \e[0m"
+    echo "    Shows the Centurion Head."
+    echo
    echo -e "\e[97m  --log-statistics-only \e[0m"
    echo "    Provides statistic only after successful building a CISS.debian.live-ISO. While enabling '--log-statistics-only'"
    echo "    the argument '--build-directory' MUST be provided."
@@ -123,10 +131,6 @@ usage() {
    echo -e "\e[97m  --primordial-key <ssh-identity-filename> \e[0m"
    echo "    SSH identity filename for the Primordial overlay clone. This MUST be a filename only; the runtime path is"
    echo "    derived as '/root/.ssh/<ssh-identity-filename>'."
-    echo "    Example fragment:"
-    echo "      ./ciss_live_builder.sh --primordial-url https://git.coresecret.dev/ahz/PhysNet.primordial.git \\"
-    echo "        --primordial-key id--git.coresecret.dev--PhysNet.primordial_deploy--ed25519--newton--2025-10 \\"
-    echo "        --primordial-ssh 42842"
    echo
    echo -e "\e[97m  --primordial-ssh <INTEGER> \e[0m"
    echo "    Adds one outgoing UFW TCP exception for a bootstrap SSH port."
@@ -162,7 +166,8 @@ usage() {
    echo -e "\e[97m  --root-password-file </dev/shm/cdlb_secrets/password.txt>> \e[0m"
    echo "    Password file for 'root', if given, MUST be a string of 42 to 64 characters."
    echo "    If the argument is omitted, no further login authentication is required for the local console."
-    echo "    MUST be placed in:"
+    echo "    The path MUST be absolute, regular, non-symlink, root-owned, and mode 0400 after normalization."
+    echo "    RECOMMENDED path:"
    echo "    </dev/shm/cdlb_secrets/password.txt>"
    echo
    echo -e "\e[97m  --secure-boot-profile <STRING> one of <debian-shim | ciss-uki> \e[0m"
@@ -178,7 +183,7 @@ usage() {
    echo "    specified via '--signing_key=*'. If the keyring is protected, then provide the passphrase in its own file."
    echo "    Specify the fingerprint of the key to use via '--signing_key_fpr=*'."
    echo "    Optionally import an offline GPG CA signing public key via: '--signing_ca=*'."
-    echo "    Change '*' to your desired files / fingerprint. Files MUST be placed in:"
+    echo "    Change '*' to your desired filename-only files / fingerprint. Files MUST be placed in:"
    echo "    </dev/shm/cdlb_secrets>"
    echo
    echo -e "\e[97m  --sops-version <STRING> \e[0m"
@@ -201,6 +206,7 @@ usage() {
    echo
    echo -e "\e[97m  --ssh-pubkey </dev/shm/cdlb_secrets/> \e[0m"
    echo "    Imports the SSH Public Key from the file 'authorized_keys' into the Live ISO."
+    echo "    Directory MUST be absolute, regular, non-symlink, root-owned, and not group/world-writable."
    echo "    Key file MUST be placed in:"
    echo "    </dev/shm/cdlb_secrets/authorized_keys>"
    echo
@@ -601,7 +601,7 @@ main() {
  var_log="/root/.ciss/cdi/log/9999-cdi-starter_$(date +"%Y-%m-%d_%H-%M-%S").log"
  touch "${var_log}"

-  printf "CISS.debian.live.builder V9.14.022.2026.06.10 calling CISS.debian.installer ... \n" >> "${var_log}"
+  printf "CISS.debian.live.builder V9.14.026.2026.06.12 calling CISS.debian.installer ... \n" >> "${var_log}"

  ### Sleep a moment to settle boot artifacts.
  sleep 8
@@ -696,7 +696,7 @@ main() {

  ### Timeout reached without acceptable semaphore.
  logger -t cdi-watcher "No valid semaphore ${VAR_SEMAPHORE} (mode 0600) within ${VAR_TIMEOUT}s; exiting idle."
-  printf "CISS.debian.live.builder V9.14.022.2026.06.10: No valid semaphore [%s] within [%s]s.\n" "${VAR_SEMAPHORE}" "${VAR_TIMEOUT}" >> "${var_log}"
+  printf "CISS.debian.live.builder V9.14.026.2026.06.12: No valid semaphore [%s] within [%s]s.\n" "${VAR_SEMAPHORE}" "${VAR_TIMEOUT}" >> "${var_log}"

  exit 0
 }
@@ -25,7 +25,7 @@ declare -grx VAR_GIT_HEAD_FULL="$(git rev-parse HEAD)"
 declare -grx VAR_HOST="$(uname -n)"
 declare -grx VAR_ISO8601="$(date -u -d "@${VAR_DATE_EPOCH}" '+%Y-%m-%dT%H:%M:%SZ')"
 declare -grx VAR_SYSTEM="$(uname -mnosv)"
-declare -grx VAR_VERSION="Master V9.14.022.2026.06.10"
+declare -grx VAR_VERSION="Master V9.14.026.2026.06.12"
 declare -grx VAR_VER_BASH="$(bash --version | head -n1 | awk '{
  # Print $4 and $5; include $6 only if it exists
  out = $4
@@ -43,6 +43,7 @@ declare -g  VAR_SSHFP="false"
 declare -g  VAR_SSHPORT=""
 declare -g  VAR_SSHPUBKEY=""
 declare -g  VAR_SUITE="trixie"
+declare -ga ARY_DEBUG_SECRET_VALUES=()
 declare -ga ARY_HANDLER_JUMPHOST_UNIQUE=()
 declare -ga ARY_HANDLER_JUMPHOST=()
 declare -ga ARY_HANDLER_NETCUP_IPV6=()
@@ -51,10 +52,12 @@ declare -gi VAR_HANDLER_PRIORITY=0
 declare -gi VAR_HANDLER_STA=0
 declare -gi VAR_REIONICE_CLASS=2
 declare -gi VAR_REIONICE_PRIORITY=4
+declare -gr CISS_BUILD_DIR_MARKER=".ciss_debian_live_builder_owned"
 declare -gr VAR_CHROOT_DIR="chroot"
 declare -gr VAR_PACKAGES_FILE="chroot.packages.live"
 declare -gx VAR_AGE_KEY=""
 declare -gx VAR_AGE="false"
+declare -gx VAR_ARG_SANITIZED=""
 declare -gx VAR_CDLB_INSIDE_RUNNER="${VAR_CDLB_INSIDE_RUNNER:-false}"
 declare -gx VAR_CISS_SECUREBOOT_PROFILE="debian-shim"
 declare -gx VAR_LUKS_KEY=""
Author	SHA256	Message	Date
msw	4633ff5ea7	V9.14.026.2026.06.12 🛡️ Retrieve DNSSEC status of coresecret.dev. / 🛡️ Retrieve DNSSEC status of coresecret.dev. (push) Has been cancelled Details 🛡️ Shell Script Linting / 🛡️ Shell Script Linting (push) Has been cancelled Details 💙 Generating a PUBLIC Live ISO. / 💙 Generating a PUBLIC Live ISO. (push) Has been cancelled Details 🔐 Generating a Private Live ISO TRIXIE. / 🔐 Generating a Private Live ISO TRIXIE. (push) Has been cancelled Details Signed-off-by: Marc S. Weidner <msw@coresecret.dev>	2026-06-12 04:52:18 +01:00
msw	bd5c7729a2	V9.14.024.2026.06.11 🛡️ Shell Script Linting / 🛡️ Shell Script Linting (push) Has been cancelled Details Signed-off-by: Marc S. Weidner <msw@coresecret.dev>	2026-06-11 21:15:37 +01:00
msw	666111df0e	V9.14.024.2026.06.11 🛡️ Shell Script Linting / 🛡️ Shell Script Linting (push) Has been cancelled Details Signed-off-by: Marc S. Weidner <msw@coresecret.dev>	2026-06-11 20:39:50 +01:00
msw	5cc2110ecb	V9.14.024.2026.06.11 🛡️ Shell Script Linting / 🛡️ Shell Script Linting (push) Has been cancelled Details Signed-off-by: Marc S. Weidner <msw@coresecret.dev>	2026-06-11 20:14:31 +01:00
msw	f6ca83fb26	V9.14.024.2026.06.11 🛡️ Shell Script Linting / 🛡️ Shell Script Linting (push) Has been cancelled Details Signed-off-by: Marc S. Weidner <msw@coresecret.dev>	2026-06-11 18:54:19 +01:00
msw	ab827e9c05	V9.14.024.2026.06.11 🛡️ Shell Script Linting / 🛡️ Shell Script Linting (push) Has been cancelled Details Signed-off-by: Marc S. Weidner <msw@coresecret.dev>	2026-06-11 18:13:13 +01:00
msw	b81b9bf836	V9.14.024.2026.06.11 🛡️ Shell Script Linting / 🛡️ Shell Script Linting (push) Has been cancelled Details Signed-off-by: Marc S. Weidner <msw@coresecret.dev>	2026-06-11 17:29:59 +01:00
msw	487d2b3ba8	V9.14.024.2026.06.11 🛡️ Retrieve DNSSEC status of coresecret.dev. / 🛡️ Retrieve DNSSEC status of coresecret.dev. (push) Has been cancelled Details 🛡️ Shell Script Linting / 🛡️ Shell Script Linting (push) Has been cancelled Details 💙 Generating a PUBLIC Live ISO. / 💙 Generating a PUBLIC Live ISO. (push) Has been cancelled Details 🔐 Generating a Private Live ISO TRIXIE. / 🔐 Generating a Private Live ISO TRIXIE. (push) Has been cancelled Details Signed-off-by: Marc S. Weidner <msw@coresecret.dev>	2026-06-11 17:12:23 +01:00
msw	97596fbcba	V9.14.024.2026.06.11 Signed-off-by: Marc S. Weidner <msw@coresecret.dev>	2026-06-11 17:11:22 +01:00