Marc S. Weidner
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
94 lines
3.4 KiB
Bash
94 lines
3.4 KiB
Bash
#!/bin/sh
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-05-05; 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: 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.live.builder
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# SPDX-Security-Contact: security@coresecret.eu
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# No bash in the installer environment, only BusyBox.
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set -o errexit
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set -o nounset
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set -o noclobber
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# Create a passphrase by pulling only characters in the range '!' to '~' (ASCII 0x21 to 0x7e) from /dev/random.
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umask 0077
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TMP_PASSPHRASE_FILE=$(mktemp)
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readonly TMP_PASSPHRASE_FILE
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grep -o '[!-~]' /dev/urandom | tr -d '\n' | head -c64 >> "${TMP_PASSPHRASE_FILE}"
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# Create an include file for debian-installer with the passphrase as answers to the questions.
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DEB_INSTALLER_CRYPT_INC_FILE=$(mktemp)
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readonly DEB_INSTALLER_CRYPT_INC_FILE
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# Read the first line (the passphrase) - POSIX-compliant
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# IFS= prevents leading/trailing spaces from being truncated,
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# -r ensures that backslashes are not interpreted.
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IFS= read -r passphrase < "${TMP_PASSPHRASE_FILE}"
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# A single printf call with exactly one redirect
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# - ShellCheck-compliant and valid in POSIX-sh
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printf 'd-i partman-crypto/passphrase string %s\n' "${passphrase}" >> "$DEB_INSTALLER_CRYPT_INC_FILE"
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printf 'd-i partman-crypto/passphrase-again string %s\n' "${passphrase}" >> "$DEB_INSTALLER_CRYPT_INC_FILE"
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# Echo the file to be included, so debian-installer will do that - assuming this command is being run via 'preseed/include_command'.
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# Without file:// will try and fetch from the webserver this preseed was served from.
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echo "file://${DEB_INSTALLER_CRYPT_INC_FILE}"
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# Add extra commands to the file that should be run using 'preseed/late_command' to ensure the passphrase is included in the new installation.
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readonly IN_TARGET_KEY_FILE=/etc/keys/luks-lvm.key
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cat - >> /tmp/late-command-script << LATE_EOF
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##### BEGIN ADDED BY preseed-crypto-key preseed/include_command
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umask 0077
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mkdir -p /target$(dirname "${IN_TARGET_KEY_FILE}")
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cp "${TMP_PASSPHRASE_FILE}" /target"${IN_TARGET_KEY_FILE}"
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# Use /root as /tmp might be noexec
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cat - >/target/root/configure-crypt-unlock <<EOF
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#!/usr/bin/bash
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# Standard bash safety features
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set -eufo pipefail
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if grep -q UMASK /etc/initramfs-tools/initramfs.conf
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then
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sed -i 's-^#\?UMASK.*\\\$-UMASK=0077-' /etc/initramfs-tools/initramfs.conf
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else
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echo -e "# Secure initramfs while it contains unlock keys for root filesystem\nUMASK=0077" >>/etc/initramfs-tools/initramfs.conf
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fi
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# Include keyfile in initramfs
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sed -i 's-^#\?KEYFILE_PATTERN=.*\\\$-KEYFILE_PATTERN=$(dirname ${IN_TARGET_KEY_FILE})/*.key-' /etc/cryptsetup-initramfs/conf-hook
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# Configure crypt to use keyfile to unlock encrypted partition(s)
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sed -i 's#\(UUID=[^ ]\+\) none#\1 ${IN_TARGET_KEY_FILE}#' /etc/crypttab
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# Update initramfs with key file
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update-initramfs -u
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exit 0
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EOF
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sleep 1
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chmod 500 /target/root/configure-crypt-unlock
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in-target /root/configure-crypt-unlock
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rm /target/root/configure-crypt-unlock
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exit 0
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##### END ADDED BY preseed-crypto-key preseed/include_command
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LATE_EOF
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exit 0
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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