#!/bin/bash
#===============================================================================
#
# DIRECTORY:
#   /home/*/.local/share/nautilus/scripts/01-verify/
# OR
#   /home/*/.gnome2/nautilus-sctipts/01-verify/ (deprecated)
#
# FILE:
#   02b-minisign-verify
#
# USAGE:
#   Right klick on the first file of an EWF image and
#   choose this nautilus script from the context menu.
#
# OPTIONS:
#   none
#
# DESCRIPTION:
#   Verifies that an logfile was digitally signed by a specific examiner.
#
# REQUIREMENTS:
#   bash, zenity, minisign and coreutils
#
# BUGS:
#   ---
#
# NOTES:
#   Tested on
#   - Arch Linux
#
# AUTHOR:
#   Patrick Neumann, patrick@neumannsland.de
#
# COMPANY:
#   (privately)
#
# VERSION:
#   0.9 (beta)
#
# LINK TO THE MOST CURRENT VERSIONS:
#   https://...
#
# CREATED:
#   10.09.2020
#
# COPYRIGHT (C):
#   2015-2020 - Patrick Neumann
#
# LICENSE:
#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
# WARRANTY:
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# TODO:
#   ---
#
# HISTORY:
#   0.9 - Patrick Neumann - Initial (public) release
#
#===============================================================================

#-------------------------------------------------------------------------------
# Additional supported Distribution(s) (add before Library!).
#-------------------------------------------------------------------------------
SUPPORTED_OSR="arch"

#-------------------------------------------------------------------------------
# Check for library (casualscripter_nautilus-scripts_functions.sh).
#-------------------------------------------------------------------------------
readonly LIBRARY="${0%/*/*}/.casualscripter_nautilus-scripts_functions.sh"
if [ ! -f "${LIBRARY}" ] ; then
  zenity --error \
         --text \
         "ERROR: casualscripter_nautilus-scripts_functions.sh MISSING!"
  exit 1
fi

source "${LIBRARY}"

#-------------------------------------------------------------------------------
# Checks (see library "casualscripter_nautilus-scripts_functions.sh").
#-------------------------------------------------------------------------------
check_dep "${GTERMINAL_BIN}" "gnome-terminal"
check_dep "${MINISIGN_BIN}" "minisign"
check_dep "${BASENAME_BIN}" "coreutils"

check_ext "${SOURCE}" "info|log|txt"

check_tmp

#-------------------------------------------------------------------------------
# Ask user for minisign public key file.
#-------------------------------------------------------------------------------
if [ ! -r "${SOURCE}.minisig" ] ; then
  error_exit "no minisign signature file (.minisig) found"
fi

if [ -r "${DIRNAME}/minisign.pub" ] ; then
  readonly MINISIGN_PUB="${DIRNAME}/minisign.pub"
else
  readonly MINISIGN_PUB="$( ${ZENITY_BIN} --title="Select minisign public key file" \
                                          --file-selection )"

  if [ -z "${MINISIGN_PUB}" ] ; then
    error_exit "no minisign public key file choosen"
  fi
fi

#-------------------------------------------------------------------------------
# Generate signify minisign file, if necessary.
#-------------------------------------------------------------------------------
readonly MINISIGNVERIFY="${TMP}/minisign-verify-$( ${BASENAME_BIN} "${SOURCE}" ).txt"

if [ ! -f "${MINISIGNVERIFY}" ] ; then
    ${PRINTF_BIN} "Verified log file:\n  %s\n\n" "$( ${BASENAME_BIN} "${SOURCE}" )" > "${MINISIGNVERIFY}"
    ${PRINTF_BIN} "Verified signature file:\n  %s\n\n" "$( ${BASENAME_BIN} "${SOURCE}" ).minisig" >> "${MINISIGNVERIFY}"
    ${PRINTF_BIN} "MD5 of log file:\n  %s\n\n" "$( ${OPENSSL_BIN} dgst -md5 "${SOURCE}" | ${AWK_BIN} '{ print $NF }' )" >> "${MINISIGNVERIFY}"
    ${PRINTF_BIN} "SHA1 of log file:\n  %s\n\n" "$( ${OPENSSL_BIN} dgst -sha1 "${SOURCE}" | ${AWK_BIN} '{ print $NF }' )" >> "${MINISIGNVERIFY}"
    ${PRINTF_BIN} "Used minisign public key file:\n  %s\n\n" "$( ${BASENAME_BIN} "${MINISIGN_PUB}" )" >> "${MINISIGNVERIFY}"
    ${PRINTF_BIN} "Output of minisign:\n  " >> "${MINISIGNVERIFY}"
    ${MINISIGN_BIN} -V -p "${MINISIGN_PUB}" -m "${SOURCE}" >> "${MINISIGNVERIFY}" 2>&1
fi

#-------------------------------------------------------------------------------
# Display content of the resultfile "minisign-verify.txt".
#-------------------------------------------------------------------------------
display_resultfile "${MINISIGNVERIFY}"

exit 0