268 lines
7.1 KiB
Bash
Executable File
268 lines
7.1 KiB
Bash
Executable File
#! /usr/bin/env bash
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set -e
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MIN_BASH_VERSION=4
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MIN_GPG_VERSION=2.2
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MIN_OPENSSL_VERSION=1.1
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MIN_GETOPT_VERSION=2.33
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## Private Functions
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### Bail with error message
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die() {
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echo "$@" >&2
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exit 1
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}
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### Bail and instruct user on missing package to install for their platform
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die_pkg() {
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local package=${1?}
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local version=${2?}
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local install_cmd
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case "$OSTYPE" in
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linux*)
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if command -v "apt" >/dev/null; then
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install_cmd="apt install ${package}"
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elif command -v "yum" >/dev/null; then
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install_cmd="yum install ${package}"
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elif command -v "pacman" >/dev/null; then
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install_cmd="pacman -Ss ${package}"
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elif command -v "nix-env" >/dev/null; then
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install_cmd="nix-env -i ${package}"
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fi
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;;
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bsd*) install_cmd="pkg install ${package}" ;;
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darwin*) install_cmd="port install ${package}" ;;
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*) die "Error: Your operating system is not supported" ;;
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esac
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echo "Error: ${package} ${version}+ does not appear to be installed." >&2
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[ ! -z "$install_cmd" ] && printf "Try: \`${install_cmd}\`" >&2
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exit 1
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}
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### Check if actual binary version is >= minimum version
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check_version(){
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local pkg="${1?}"
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local have="${2?}"
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local need="${3?}"
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[[ "$have" == "$need" ]] && return 0
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local IFS=.
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local i ver1=($have) ver2=($need)
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for ((i=${#ver1[@]}; i<${#ver2[@]}; i++));
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do ver1[i]=0;
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done
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for ((i=0; i<${#ver1[@]}; i++)); do
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[[ -z ${ver2[i]} ]] && ver2[i]=0
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((10#${ver1[i]} > 10#${ver2[i]})) && return 0
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((10#${ver1[i]} < 10#${ver2[i]})) && die_pkg "${pkg}" "${need}"
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done
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}
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### Check if required binaries are installed at appropriate versions
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check_tools(){
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if [ -z "${BASH_VERSINFO}" ] \
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|| [ -z "${BASH_VERSINFO[0]}" ] \
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|| [ ${BASH_VERSINFO[0]} -lt ${MIN_BASH_VERSION} ]; then
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die_pkg "bash" "${MIN_BASH_VERSION}"
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fi
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for cmd in "$@"; do
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command -v "$1" >/dev/null || die "Error: $cmd not found"
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case $cmd in
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gpg)
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version=$(gpg --version | head -n1 | cut -d" " -f3)
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check_version "gnupg" "${version}" "${MIN_GPG_VERSION}"
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;;
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openssl)
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version=$(openssl version | cut -d" " -f2 | sed 's/[a-z]//g')
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check_version "openssl" "${version}" "${MIN_OPENSSL_VERSION}"
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;;
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getopt)
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version=$(getopt --version | cut -d" " -f4 | sed 's/[a-z]//g')
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check_version "getopt" "${version}" "${MIN_GETOPT_VERSION}"
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;;
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esac
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done
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}
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### Handle different implementations of mktemp across platforms
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get_temp(){
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echo "$(
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mktemp \
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--quiet \
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--directory \
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-t "$(basename "$0").XXXXXX" 2>/dev/null
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|| mktemp \
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--quiet \
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--directory
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)"
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}
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### Get files that will be added to the manifest for signing
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### Use git if available, else fall back to find
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get_files(){
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if command -v git >/dev/null; then
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git ls-files | grep -v ".${PROGRAM}"
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else
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find . \
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-type f \
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-not -path "./.git/*" \
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-not -path "./.${PROGRAM}/*"
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fi
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}
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### Verify a file has 0-N unique valid detached signatures
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### Optionally verify all signatures belong to keys in gpg alias group
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verify_file() {
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[ $# -eq 3 ] || die "Usage: verify_file <threshold> <group> <file>"
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local threshold="${1}"
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local group="${2}"
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local filename="${3}"
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local group_config=""
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local sig_count=0
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local seen_fingerprints=""
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local fingerprint
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local signer
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if [ ! -z "$group" ]; then
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group_config="$( \
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gpg --with-colons --list-config group \
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| grep -i "^cfg:group:${group}:" \
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)" || die "Error: group \"${group}\" not found in ~/.gnupg/gpg.conf"
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fi
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for sig_filename in "${filename%.*}".*.asc; do
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gpg --verify "${sig_filename}" "${filename}" >/dev/null 2>&1 || {
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echo "Invalid signature: ${sig_filename}";
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exit 1;
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}
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fingerprint=$( \
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gpg --list-packets "${sig_filename}" \
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| grep keyid \
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| sed 's/.*keyid //g'
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)
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signer=$( \
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gpg \
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--list-keys \
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--with-colons "${fingerprint}" 2>&1 \
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| awk -F: '$1 == "uid" {print $10}' \
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| head -n1 \
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)
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[[ "${seen_fingerprints}" == *"${fingerprint}"* ]] \
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&& die "Duplicate signature: ${sig_filename}";
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[ ! -z "$group_config" ] \
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&& [[ "${group_config}" != *"${fingerprint}"* ]] \
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&& die "Signature not in group \"${group}\": ${sig_filename}";
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echo "Verified signature by \"${signer}\""
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seen_fingerprints="${seen_fingerprints} ${fingerprint}"
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((sig_count=sig_count+1))
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done
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[[ "$sig_count" -ge "$threshold" ]] || {
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echo "Minimum number of signatures not met: ${sig_count}/${threshold}";
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exit 1;
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}
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}
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### Verify all commits in git repo have valid signatures
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### Optionally verify a minimum number of valid unique signatures
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### Optionally verify all signatures belong to keys in gpg alias group
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verify_git(){
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[ $# -eq 2 ] || die "Usage: verify_git <threshold> <group>"
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local threshold="${1}"
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local group="${2}"
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#for commit in $(git log --format='%H%GP'); do
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# echo "$commit"
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#done
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}
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## Public Commands
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cmd_manifest() {
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mkdir -p ".${PROGRAM}"
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printf "$(get_files | xargs openssl sha256 -r)" \
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| sed -e 's/ \*/ /g' -e 's/ \.\// /g' \
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| LC_ALL=C sort -k2 \
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> ".${PROGRAM}/manifest.txt"
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}
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cmd_verify() {
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local opts min=1 group=""
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opts="$(getopt -o m:g: -l min:,group: -n "$PROGRAM" -- "$@")"
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eval set -- "$opts"
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while true; do case $1 in
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-m|--min) min="$2"; shift 2 ;;
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-g|--group) group="$2"; shift 2 ;;
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--) shift; break ;;
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esac done
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command -v git >/dev/null 2>&1 \
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&& ( [ -d .git ] || git rev-parse --git-dir > /dev/null 2>&1 ) \
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&& verify_git "${min}" "${group}"
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#TODO: if git and if invalid: show diff against last valid version
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( [ -d ".${PROGRAM}" ] && ls .${PROGRAM}/*.asc >/dev/null 2>&1 ) \
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|| die "Error: No signatures"
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cmd_manifest
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verify_file "${min}" "${group}" .${PROGRAM}/manifest.txt
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}
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cmd_add(){
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cmd_manifest
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gpg --armor --detach-sig .${PROGRAM}/manifest.txt
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local fingerprint=$( \
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gpg --list-packets .${PROGRAM}/manifest.txt.asc \
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| grep "issuer key ID" \
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| sed 's/.*\([A-Z0-9]\{16\}\).*/\1/g' \
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)
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mv .${PROGRAM}/manifest.{"txt.asc","${fingerprint}.asc"}
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}
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cmd_version() {
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cat <<-_EOF
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==========================================
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= sig: simple multisig trust toolchain =
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= =
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= v0.0.1 =
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= =
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= https://gitlab.com/pchq/sig =
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==========================================
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_EOF
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}
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cmd_usage() {
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cmd_version
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cat <<-_EOF
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Usage:
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$PROGRAM verify [--group=<group>,-g <group>] [--min=<N>,-m <N>]
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Verify m-of-n signatures by given group are present for directory
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$PROGRAM add
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Add signature to manifest for this directory
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$PROGRAM manifest
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Generate hash manifest for this directory
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$PROGRAM help
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Show this text.
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$PROGRAM version
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Show version information.
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_EOF
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}
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# Verify all tools in this list are installed at needed versions
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check_tools head cut find sort sed getopt gpg openssl
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# Allow entire script to be namespaced based on filename
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PROGRAM="${0##*/}"
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# Export public sub-commands
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case "$1" in
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verify) shift; cmd_verify "$@" ;;
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add) shift; cmd_add "$@" ;;
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manifest) shift; cmd_manifest "$@" ;;
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version|--version) shift; cmd_version "$@" ;;
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help|--help) shift; cmd_usage "$@" ;;
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*) cmd_usage "$@" ;;
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esac
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