Marc S. Weidner
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
117 lines
4.1 KiB
Bash
117 lines
4.1 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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# '/etc/crypttab' entry writer and logger.
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# Globals:
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# TARGET
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# Arguments:
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# 1: Encryption Label
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# 2: LUKS Container UUID
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# 3: Keyfile or none
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# 4: LUKS Options
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# Returns:
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# 0: Successfully executed commands.
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#######################################
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write_crypttab() {
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declare _label="$1" _device="$2" _key_file="$3" _opts="$4"
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printf "%s %s %s %s\n" "${_label}" "${_device}" "${_key_file}" "${_opts}" >> "${TARGET}/etc/crypttab"
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do_log "info" "true" "crypttab entry generated: '${_label} ${_device} ${_key_file} ${_opts}'."
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return 0
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}
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#######################################
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# Generate target '/etc/crypttab' entries.
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# Globals:
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# HMP_EPHEMERAL_ENCLABEL
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# HMP_EPHEMERAL_FS_LABEL
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# HMP_PATH_ENCLABEL
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# HMP_PATH_LUKSUUID
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# TARGET
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# user_dropbear_boot
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# Arguments:
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# None
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# Returns:
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# 0: Successfully executed commands.
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#######################################
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generate_crypttab() {
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declare var_key var_encryption_label var_luks_uuid
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### Generate '${TARGET}/etc/crypttab' header.
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: >| "${TARGET}/etc/crypttab"
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chmod 0644 "${TARGET}/etc/crypttab"
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cat << 'EOF' >> "${TARGET}/etc/crypttab"
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# /etc/crypttab: static file system information.
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#
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# Basic rule: 'discard' / 'nodiscard' are normally only set in '/etc/crypttab' when LUKS/dm-crypt is in use.
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# Options like 'discard=async' or similar are typically only set in '/etc/fstab' (at the file system level).
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# The crypttab determines whether the underlying encrypted device (LUKS/dm-crypt) passes TRIM commands to the
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# physical drive or not. The fstab determines whether and how the file system itself generates the discard
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# operations and sends them down through the LUKS layer.
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#
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# RECOMMENDED: 'discard' enables the TRIM commands to be forwarded by the dm-crypt layer to the SSD/physical
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# device. If you do not specify discard in the crypttab, dm-crypt blocks TRIM by default. This would render a
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# discard in the fstab ineffective.
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#
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# <name> <device> <password-file-or-none> <options>
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EOF
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### Generate '${TARGET}/etc/crypttab' entries.
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declare var_ephemeral_enclabel var_ephemeral_fs_label
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for var_key in "${!HMP_PATH_LUKSUUID[@]}"; do
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var_encryption_label="${HMP_PATH_ENCLABEL["${var_key}"]}"
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var_luks_uuid="${HMP_PATH_LUKSUUID["${var_key}"]}"
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if [[ "${user_dropbear_boot,,}" == "true" ]]; then
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write_crypttab "${var_encryption_label}" "UUID=${var_luks_uuid}" "none" "luks,discard,initramfs"
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else
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write_crypttab "${var_encryption_label}" "UUID=${var_luks_uuid}" "none" "luks,discard"
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fi
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done
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### Generate '${TARGET}/etc/crypttab' ephemeral entries.
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for var_key in "${!HMP_EPHEMERAL_ENCLABEL[@]}"; do
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var_ephemeral_enclabel="${HMP_EPHEMERAL_ENCLABEL["${var_key}"]}"
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var_ephemeral_fs_label="${HMP_EPHEMERAL_FS_LABEL["${var_key}"]}"
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case "${var_key}" in
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SWAP)
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write_crypttab "${var_ephemeral_enclabel}" "LABEL=${var_ephemeral_fs_label}" "/dev/random" "swap,offset=2048,cipher=aes-xts-plain64,size=512,sector-size=4096"
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continue
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;;
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/tmp)
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write_crypttab "${var_ephemeral_enclabel}" "LABEL=${var_ephemeral_fs_label}" "/dev/random" "offset=2048,cipher=aes-xts-plain64,size=512,sector-size=4096,tmp=ext4"
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continue
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;;
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*)
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do_log "error" "false" "Only 'SWAP' and '/tmp' are valid Partitions for Ephemeral Encryption. Given value was: '${var_key}'."
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;;
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esac
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done
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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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