Marc S. Weidner
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
336 lines
9.9 KiB
Bash
336 lines
9.9 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: GPL-3.0-or-later
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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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### Modified Version of the original file:
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### https://salsa.debian.org/live-team/live-boot 'components/0030-ciss-verify-checksums'
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### In case of successful verification of the offered checksum, proceed with booting; otherwise panic.
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#######################################
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# Modified checksum-integrity and authenticity-verification-script depending on pinned GPG FPR for boot process verification.
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# Globals:
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# LIVE_BOOT_CMDLINE
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# _TTY
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# Arguments:
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# 1: _MOUNTPOINT
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# Returns:
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# 0 : Successful verification
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#######################################
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Verify_checksums() {
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printf "\e[95m[INFO] Starting : [/usr/lib/live/boot/0030-ciss-verify-checksums] \n\e[0m"
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### Declare variables --------------------------------------------------------------------------------------------------------
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### Will be replaced at build time:
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export CDLB_EXP_FPR="@EXP_FPR@"
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export CDLB_EXP_CA_FPR="@EXP_CA_FPR@"
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### Declare functions --------------------------------------------------------------------------------------------------------
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#######################################
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# Helper for colored text output on stdout.
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# Globals:
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# None
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# Arguments:
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# *: String to print
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#######################################
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log_in() { printf '\e[95m[INFO] %s \n\e[0m' "$*"; }
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#######################################
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# Helper for colored text output on stdout.
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# Globals:
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# None
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# Arguments:
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# *: String to print
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#######################################
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log_ok() { printf '\e[92m[INFO] %s \n\e[0m' "$*"; }
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#######################################
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# Helper for colored text output on stdout.
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# Globals:
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# None
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# Arguments:
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# *: String to print
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#######################################
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log_er() { printf '\e[91m[FATAL] %s \n\e[0m' "$*"; }
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_MOUNTPOINT="${1}"
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_PARAMETER=""
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_TTY="/dev/tty8"
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LIVE_VERIFY_CHECKSUMS_DIGESTS="${LIVE_VERIFY_CHECKSUMS_DIGESTS:-sha512 sha384 sha256}"
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LIVE_VERIFY_CHECKSUMS_SIGNATURES="false"
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_KEYFILE=""
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_MP=""
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### Parse commandline arguments ----------------------------------------------------------------------------------------------
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for _PARAMETER in ${LIVE_BOOT_CMDLINE}; do
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case "${_PARAMETER}" in
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live-boot.verify-checksums=* | verify-checksums=*)
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LIVE_VERIFY_CHECKSUMS="true"
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LIVE_VERIFY_CHECKSUMS_DIGESTS="${_PARAMETER#*verify-checksums=}"
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;;
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live-boot.verify-checksums | verify-checksums)
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LIVE_VERIFY_CHECKSUMS="true"
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;;
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live-boot.verify-checksums-signatures | verify-checksums-signatures)
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LIVE_VERIFY_CHECKSUMS_SIGNATURES="true"
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;;
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esac
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done
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### Check if the function should be skipped ----------------------------------------------------------------------------------
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case "${LIVE_VERIFY_CHECKSUMS}" in
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true)
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:
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;;
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*)
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return 0
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;;
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esac
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### Check GPG pubkey file correct path ---------------------------------------------------------------------------------------
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for _MP in /lib/live/mount/medium /run/live/medium /cdrom /; do
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if [ -e "${_MP}/${CDLB_EXP_FPR}.gpg" ]; then
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_KEYFILE="${_MP}/${CDLB_EXP_FPR}.gpg"
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if [ -e "${_MP}/${CDLB_EXP_CA_FPR}.gpg" ]; then
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_CA_KEYFILE="${_MP}/${CDLB_EXP_CA_FPR}.gpg"
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fi
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break
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fi
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done
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# shellcheck disable=SC2164
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cd "${_MOUNTPOINT}"
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### CDLB verification of script integrity itself -----------------------------------------------------------------------------
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if [ "${LIVE_VERIFY_CHECKSUMS_SIGNATURES}" = "true" ]; then
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log_begin_msg "Verifying integrity of: [0030-ciss-verify-checksums]"
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printf "\n"
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_CAND=""
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CDLB_SCRIPT_SELF="" CDLB_CMD="" CDLB_COMPUTED="" CDLB_EXPECTED="" CDLB_HASHFILE="" CDLB_SIG_FILE=""
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CDLB_CMD="/usr/bin/sha512sum"
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CDLB_SHA="sha512"
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for _CAND in /scripts/live-bottom/0030-ciss-verify-checksums /usr/lib/live/boot/0030-ciss-verify-checksums ; do
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[ -e "${_CAND}" ] && { CDLB_SCRIPT_SELF="${_CAND}"; break; }
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done
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CDLB_SCRIPT_FILE="${CDLB_SCRIPT_SELF##*/}"
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CDLB_SCRIPT_PATH="${CDLB_SCRIPT_SELF%/*}"
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CDLB_SCRIPT_FULL="${CDLB_SCRIPT_PATH%/}/${CDLB_SCRIPT_FILE}"
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CDLB_HASHFILE="/etc/ciss/hashes/${CDLB_SCRIPT_FILE}.${CDLB_SHA}sum.txt"
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CDLB_SIG_FILE="/etc/ciss/signatures/${CDLB_SCRIPT_FILE}.${CDLB_SHA}sum.txt.sig"
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_STATUS="$(/usr/bin/gpgv --keyring "${_KEYFILE}" --status-fd 1 "${CDLB_SIG_FILE}" "${CDLB_SCRIPT_FULL}")"
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_CDLB_SIG_FILE_FPR="$(printf '%s\n' "${_STATUS}" | awk '/^\[GNUPG:\] VALIDSIG /{print $3; exit}')"
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### Compare against pinned and expected fingerprint.
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if [ "${_CDLB_SIG_FILE_FPR}" = "${CDLB_EXP_FPR}" ]; then
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log_ok "Signature FPR valid: got: [${_CDLB_SIG_FILE_FPR}] expected: [${CDLB_EXP_FPR}]"
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else
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log_er "Signature FPR mismatch: got: [${_CDLB_SIG_FILE_FPR}] expected: [${CDLB_EXP_FPR}]"
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sleep 8
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panic "[FATAL] Signature FPR mismatch: got: [${_CDLB_SIG_FILE_FPR}] expected: [${CDLB_EXP_FPR}]."
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fi
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### Script self-integrity and authenticity checks --------------------------------------------------------------------------
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### Assumption: initramfs itself is not altered.
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log_in "Verifying signature of: [${CDLB_SIG_FILE}] ..."
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if ! /usr/bin/gpgv --keyring "${_KEYFILE}" --status-fd 1 "${CDLB_SIG_FILE}" "${CDLB_HASHFILE}"; then
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log_er "Verifying signature of: [${CDLB_SIG_FILE}] failed."
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sleep 8
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panic "[FATAL] Verifying signature of: [${CDLB_SIG_FILE}] failed."
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else
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log_ok "Verifying signature of: [${CDLB_SIG_FILE}] successful."
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fi
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log_in "Recomputing hash for: [${CDLB_SHA}] ..."
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CDLB_COMPUTED=$("${CDLB_CMD}" "${CDLB_SCRIPT_FULL}" | { read -r first _ || exit 1; printf '%s\n' "${first}"; })
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IFS=' ' read -r CDLB_EXPECTED _ < "${CDLB_HASHFILE}"
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if [ "${CDLB_COMPUTED}" != "${CDLB_EXPECTED}" ]; then
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log_er "Recomputing hash for: [${CDLB_SHA}] failed."
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sleep 8
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panic "[FATAL] Recomputing hash for: [${CDLB_SHA}] failed."
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fi
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log_ok "Recomputing hash for: [${CDLB_SHA}] successful."
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log_ok "Verification of authenticity and integrity of [${CDLB_SCRIPT_FULL}] successfully completed."
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log_end_msg
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printf "\n"
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fi
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### Checksum and checksum signature verification -----------------------------------------------------------------------------
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log_begin_msg "Verifying checksums"
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printf "\n"
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log_in "Verifying checksums ..."
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# shellcheck disable=SC2001
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for _DIGEST in $(echo "${LIVE_VERIFY_CHECKSUMS_DIGESTS}" | sed -e 's|,| |g'); do
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# shellcheck disable=SC2060
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_CHECKSUMS="$(echo "${_DIGEST}" | tr [a-z] [A-Z])SUMS ${_DIGEST}sum.txt"
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for _CHECKSUM in ${_CHECKSUMS}; do
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if [ -e "${_CHECKSUM}" ]; then
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log_in "Found: [${_CHECKSUM}] ..."
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if [ -e "/usr/bin/${_DIGEST}sum" ]; then
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log_in "Found: [/usr/bin/${_DIGEST}sum] ..."
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if [ "${LIVE_VERIFY_CHECKSUMS_SIGNATURES}" = "true" ]; then
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log_in "Checking signature of: [${_CHECKSUM}] ..."
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_CHECKSUM_SIGNATURE="${_CHECKSUM}.sig"
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if /usr/bin/gpgv --keyring "${_KEYFILE}" --status-fd 1 "${_CHECKSUM_SIGNATURE}" "${_CHECKSUM}"; then
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_RETURN_PGP="${?}"
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log_in "Checking signature of: [${_CHECKSUM}] successful."
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else
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_RETURN_PGP="${?}"
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log_er "Checking signature of: [${_CHECKSUM}] failed."
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fi
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else
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_RETURN_PGP="na"
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fi
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# shellcheck disable=SC2312
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if grep -v '^#' "${_CHECKSUM}" | /usr/bin/"${_DIGEST}"sum -c > "${_TTY}"; then
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_RETURN_SHA="${?}"
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log_ok "Found: [/usr/bin/${_DIGEST}sum] successful verified: [${_CHECKSUM}]"
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else
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_RETURN_SHA="${?}"
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log_er "Found: [/usr/bin/${_DIGEST}sum] unsuccessful verified: [${_CHECKSUM}]"
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fi
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# Stop after the first verification.
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break 2
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else
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_RETURN_SHA="255"
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log_er "NOT Found [/usr/bin/${_DIGEST}sum]."
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fi
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fi
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done
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done
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log_end_msg
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printf "\n"
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case "${_RETURN_PGP},${_RETURN_SHA}" in
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"0,0")
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log_ok "Verification of [GPG signature] and [sha checksum] file successful; continuing booting in 8 seconds."
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log_success_msg "Verification of [GPG signature] and [sha checksum] file successful; continuing booting in 8 seconds."
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sleep 8
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return 0
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;;
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"na,0")
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log_ok "Verification of [sha checksum] file successful; continuing booting in 8 seconds."
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log_success_msg "Verification of [sha checksum] file successful; continuing booting in 8 seconds."
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sleep 8
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return 0
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;;
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"0,"*)
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log_er "Verification of [GPG signature] file successful, while verification of [sha checksum] file failed."
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sleep 8
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panic "Verification of [GPG signature] file successful, while verification of [sha checksum] file failed."
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;;
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*",0")
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log_er "Verification of [GPG signature] file failed, while verification of [sha checksum] file successful."
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sleep 8
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panic "Verification of [GPG signature] file failed, while verification of [sha checksum] file successful."
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;;
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"na,"*)
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log_er "Verification of [sha checksum] file failed."
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sleep 8
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panic "Verification of [sha checksum] file failed."
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;;
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esac
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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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