msw
9cdcc0a9ec
🛡️ Retrieve DNSSEC status of coresecret.dev. / 🛡️ Retrieve DNSSEC status of coresecret.dev. (push) Has been cancelled
🛡️ Shell Script Linting / 🛡️ Shell Script Linting (push) Has been cancelled
💙 Generating a PUBLIC Live ISO. / 💙 Generating a PUBLIC Live ISO. (push) Has been cancelled
🔐 Generating a Private Live ISO TRIXIE. / 🔐 Generating a Private Live ISO TRIXIE. (push) Has been cancelled
Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
43 lines
1.8 KiB
Bash
43 lines
1.8 KiB
Bash
#!/bin/sh
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# bashsupport disable=BP5007
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# shellcheck disable=SC2249
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# shellcheck shell=sh
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-11-12; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.git
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# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
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# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-FileType: SOURCE
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# SPDX-License-Identifier: LicenseRef-CNCL-1.1 OR LicenseRef-CCLA-1.1
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# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
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# SPDX-PackageName: CISS.debian.live.builder
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# SPDX-Security-Contact: security@coresecret.eu
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# Module summary:
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# - Runs during live-boot premount while the system is still inside the initramfs.
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# - Applies early kernel hardening before the real root and regular services are active.
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# - Restricts ptrace, unprivileged BPF, core dumps, kexec, unsafe link handling, regular-file protections, and kernel pointer
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# exposure where supported.
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_SAVED_SET_OPTS="$(set +o)"
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set -eu
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printf "\e[95m[INFO] Starting : [/usr/lib/live/boot/0026-ciss-early-sysctl.sh] \n\e[0m"
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echo 2 > /proc/sys/kernel/yama/ptrace_scope 2>/dev/null || true
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echo 1 > /proc/sys/kernel/unprivileged_bpf_disabled 2>/dev/null || true
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echo 0 > /proc/sys/fs/suid_dumpable 2>/dev/null || true
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echo 1 > /proc/sys/kernel/kexec_load_disabled 2>/dev/null || true
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echo 1 > /proc/sys/fs/protected_symlinks 2>/dev/null || true
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echo 1 > /proc/sys/fs/protected_hardlinks 2>/dev/null || true
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echo 2 > /proc/sys/fs/protected_regular 2>/dev/null || true
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echo 2 > /proc/sys/kernel/kptr_restrict 2>/dev/null || true
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eval "${_SAVED_SET_OPTS}"
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printf "\e[92m[INFO] Successfully applied : [/usr/lib/live/boot/0026-ciss-early-sysctl.sh] \n\e[0m"
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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