Marc S. Weidner
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
74 lines
3.1 KiB
Bash
74 lines
3.1 KiB
Bash
#!/bin/bash
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-06-17; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.installer.git
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# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
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# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-FileType: SOURCE
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# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
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# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
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# SPDX-PackageName: CISS.debian.installer
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# SPDX-Security-Contact: security@coresecret.eu
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guard_sourcing
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#######################################
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# Entropy collection improvements '/usr/lib/modules-load.d/30_security-misc.conf'.
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# Globals:
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# TARGET
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# Arguments:
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# None
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# Returns:
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# 0: on success
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#######################################
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kernel_modules() {
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### Entropy collection improvements
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mkdir -p "${TARGET}/usr/lib/modules-load.d"
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insert_header "${TARGET}/usr/lib/modules-load.d/30_security-misc.conf"
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insert_comments "${TARGET}/usr/lib/modules-load.d/30_security-misc.conf"
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cat << EOF >> "${TARGET}/usr/lib/modules-load.d/30_security-misc.conf"
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# The jitterentropy_rng kernel module provides a reliable and hardware-independent source of cryptographic entropy by measuring
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# minute variations in CPU execution timing (jitter). These microsecond-level differences are unpredictable and rooted in
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# physical randomness, making them suitable for high-quality entropy generation. Unlike other RNG methods that rely on hardware
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# features like TPMs or Intel's RDRAND, which may not be available or trusted, jitterentropy_rng works across all platforms,
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# including virtual machines and air-gapped systems. It is compliant with NIST SP 800-90B and BSI TR-02102-4, ensuring secure
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# entropy even during early boot stages, such as in initramfs or before full userland is available. It is the most secure,
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# standards-compliant, and universally applicable entropy source for hardened Linux environments.
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# https://www.whonix.org/wiki/Dev/Entropy
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# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=927972
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# https://forums.whonix.org/t/jitterentropy-rngd/7204
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jitterentropy_rng
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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EOF
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chmod 0644 "${TARGET}/usr/lib/modules-load.d/30_security-misc.conf"
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do_log "info" "file_only" "4400() Installed: '/usr/lib/modules-load.d/30_security-misc.conf'."
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guard_dir && return 0
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}
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#######################################
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# Blacklist some kind of potential hazardous modules via '/etc/modprobe.d/0000_ciss_debian_installer.conf'.
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# Globals:
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# TARGET
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# VAR_SETUP_PATH
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# Arguments:
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# None
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# Returns:
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# 0: on success
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#######################################
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kernel_modprobe() {
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install -D -m 0755 -o root -g root "${VAR_SETUP_PATH}/includes/target/etc/modprobe.d/0000_ciss_debian_installer.cnf" \
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"${TARGET}/etc/modprobe.d/0000_ciss_debian_installer.conf"
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insert_comments "${TARGET}/etc/modprobe.d/0000_ciss_debian_installer.conf"
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do_log "info" "file_only" "4400() Installed: '/etc/modprobe.d/0000_ciss_debian_installer.conf'."
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guard_dir && return 0
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}
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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