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#!/bin/sh
# Get the online version of the GnuPG software version database
# Copyright (C) 2014 Werner Koch
#
# This file is free software; as a special exception the author gives
# unlimited permission to copy and/or distribute it, with or without
# modifications, as long as this notice is preserved.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# The URL of the file to retrieve.
urlbase="https://versions.gnupg.org/"
WGET=wget
GPGV=gpgv
srcdir=$(dirname "$0")
distsigkey="$srcdir/../g10/distsigkey.gpg"
# Convert a 3 part version number it a numeric value.
cvtver () {
awk 'NR==1 {split($NF,A,".");X=1000000*A[1]+1000*A[2]+A[3];print X;exit 0}'
}
# Prints usage information.
usage()
{
cat <<EOF
Usage: $(basename $0) [OPTIONS]
Get the online version of the GnuPG software version database
Options:
--skip-download Assume download has already been done.
--skip-verify Do not check signatures
--skip-selfcheck Do not check GnuPG version
--find-sha1sum Print the name of the sha1sum utility
--find-sha256sum Print the name of the sha256sum utility
--help Print this help.
EOF
exit $1
}
#
# Parse options
#
skip_download=no
skip_verify=no
skip_selfcheck=no
find_sha1sum=no
find_sha256sum=no
while test $# -gt 0; do
case "$1" in
# Set up `optarg'.
--*=*)
optarg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'`
;;
*)
optarg=""
;;
esac
case $1 in
--help|-h)
usage 0
;;
--skip-download)
skip_download=yes
;;
--skip-verify)
skip_verify=yes
;;
--skip-selfcheck)
skip_selfcheck=yes
;;
--find-sha1sum)
find_sha1sum=yes
;;
--find-sha256sum)
find_sha256sum=yes
;;
*)
usage 1 1>&2
;;
esac
shift
done
# Mac OSX has only a shasum and not sha1sum
if [ ${find_sha1sum} = yes ]; then
for i in sha1sum shasum ; do
tmp=$($i </dev/null 2>/dev/null | cut -d ' ' -f1)
if [ x"$tmp" = x"da39a3ee5e6b4b0d3255bfef95601890afd80709" ]; then
echo "$i"
exit 0
fi
done
echo "false"
exit 1
fi
# Mac OSX has only a shasum and not sha256sum
if [ ${find_sha256sum} = yes ]; then
for i in 'shasum -a 256' sha256sum ; do
tmp=$($i </dev/null 2>/dev/null | cut -d ' ' -f1)
tmp2="e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
if [ x"$tmp" = x"$tmp2" ]; then
echo "$i"
exit 0
fi
done
echo "false"
exit 1
fi
# Get GnuPG version from VERSION file. For a GIT checkout this means
# that ./autogen.sh must have been run first. For a regular tarball
# VERSION is always available.
if [ ! -f "$srcdir/../VERSION" ]; then
echo "VERSION file missing - run autogen.sh first." >&2
exit 1
fi
version=$(cat "$srcdir/../VERSION")
version_num=$(echo "$version" | cvtver)
if [ $skip_verify = no ]; then
if ! $GPGV --version >/dev/null 2>/dev/null ; then
echo "command \"gpgv\" is not installed" >&2
echo "(please install an older version of GnuPG)" >&2
exit 1
fi
fi
#
# Download the list and verify.
#
if [ $skip_download = yes ]; then
if [ ! -f swdb.lst ]; then
echo "swdb.lst is missing." >&2
exit 1
fi
if [ $skip_verify = no ]; then
if [ ! -f swdb.lst.sig ]; then
echo "swdb.lst.sig is missing." >&2
exit 1
fi
fi
else
if ! $WGET --version >/dev/null 2>/dev/null ; then
echo "command \"wget\" is not installed" >&2
exit 1
fi
if ! $WGET -q -O swdb.lst "$urlbase/swdb.lst" ; then
echo "download of swdb.lst failed." >&2
exit 1
fi
if [ $skip_verify = no ]; then
if ! $WGET -q -O swdb.lst.sig "$urlbase/swdb.lst.sig" ; then
echo "download of swdb.lst.sig failed." >&2
exit 1
fi
fi
fi
if [ $skip_verify = no ]; then
if ! $GPGV --keyring "$distsigkey" swdb.lst.sig swdb.lst; then
echo "list of software versions is not valid!" >&2
exit 1
fi
fi
#
# Check that the online version of GnuPG is not less than this version
# to help detect rollback attacks.
#
if [ $skip_selfcheck = no ]; then
gnupg_ver=$(awk '$1=="gnupg24_ver" {print $2;exit}' swdb.lst)
if [ -z "$gnupg_ver" ]; then
echo "GnuPG 2.4 version info missing in swdb.lst!" >&2
exit 1
fi
gnupg_ver_num=$(echo "$gnupg_ver" | cvtver)
if [ $(( $gnupg_ver_num >= $version_num )) = 0 ]; then
echo "GnuPG version in swdb.lst is less than this version!" >&2
echo " This version: $version" >&2
echo " SWDB version: $gnupg_ver" >&2
exit 1
fi
fi
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