150 lines
3.4 KiB
Bash
Executable File
150 lines
3.4 KiB
Bash
Executable File
#! /usr/bin/env bash
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set -e
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die() {
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echo "$@" >&2
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exit 1
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}
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checktools(){
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for cmd in "$@"; do
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if ! command -v "$1" >/dev/null; then
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printf "not found!\n";
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return 1;
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fi
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done
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}
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gpg_env(){
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GNUPGHOME=$(mktemp -d -p /dev/shm/); export GNUPGHOME
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killall gpg-agent 2> /dev/null
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gpg-agent --daemon --extra-socket "$GNUPGHOME/S.gpg-agent" 2> /dev/null
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echo "export PATH=$GNUPGHOME:$PATH \
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export GNUPGHOME=$GNUPGHOME; \
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export GPG_AGENT_INFO=$GNUPGHOME/S.gpg-agent"
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}
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gpg_cleanup(){
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gpgconf --kill gpg-agent
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rm -rf "$GNUPGHOME"
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}
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verify_file() {
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filename="${1?}"
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sig_count=0
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seen_fingerprints=""
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for sig_filename in "${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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echo "Duplicate signature: ${sig_filename}";
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exit 1;
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}
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echo "Verified signature by \"${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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cmd_manifest() {
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mkdir -p .siglog
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find . \
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-type f \
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-not -path "./.git/*" \
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-not -path "./.siglog/*" \
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-exec openssl sha256 -r {} \; \
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| sed 's/ \*/ /g' \
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| LC_ALL=C sort -k2 \
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> .siglog/manifest.txt
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}
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cmd_detach-verify() {
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[ $# -lt 3 ] || die \
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"Usage: detach-verify <threshold> <pubkey_dir> <file> (, <file, ...)"
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threshold="${1}"
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pubkey_dir="${2}"
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target_files="${*:3}"
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eval "$(gpg_env)"
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gpg --import "${pubkey_dir}"/*.asc 2>/dev/null
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for target_file in ${target_files}; do
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verify_file "${target_file}"
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done
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gpg_cleanup
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}
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cmd_verify() {
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cmd_manifest
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for file in .siglog/*.asc; do
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gpg --verify "$file" signatures/manifest.txt
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done
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}
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cmd_version() {
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cat <<-_EOF
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============================================
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= siglog: simple multisig trust toolchain =
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= =
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= v0.0.1 =
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= =
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= https://gitlab.com/pchq/siglog =
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============================================
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_EOF
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}
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cmd_usage() {
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cmd_version
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echo
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cat <<-_EOF
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Usage:
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$PROGRAM detach-verify [<threshold> <pubkey_dir> <file> (, <file, ...)
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Verify detached signatures of the provided file by m-of-n keys
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$PROGRAM verify
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Verify all signing policies for this directory are met
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$PROGRAM manifest
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Generate hash manifest for this directory
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$PROGRAM sign
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Add signature to manifest for this directory
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$PROGRAM help
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Show this text.
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$PROGRAM version
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Show version information.
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_EOF
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}
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PROGRAM="${0##*/}"
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COMMAND="$1"
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checktools gpg openssl
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case "$1" in
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detach-verify) shift; cmd_detach-verify "$@" ;;
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verify) shift; cmd_verify "$@" ;;
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manifest) shift; cmd_manifest "$@" ;;
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sign) shift; cmd_sign "$@" ;;
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version|--version) shift; cmd_version "$@" ;;
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help|--help) shift; cmd_usage "$@" ;;
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*) cmd_usage "$@" ;;
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esac
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exit 0
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