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233
devops/docker/repro-builders/debian/scripts/build.sh
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233
devops/docker/repro-builders/debian/scripts/build.sh
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#!/bin/bash
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# Debian Reproducible Build Script
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# Builds packages with deterministic settings for fingerprint generation
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#
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# Usage: build.sh [build|diff] <package> <version> [patch_url...]
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set -euo pipefail
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COMMAND="${1:-help}"
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PACKAGE="${2:-}"
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VERSION="${3:-}"
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OUTPUT_DIR="${OUTPUT_DIR:-/output}"
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log() {
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echo "[$(date -u +%Y-%m-%dT%H:%M:%SZ)] $*" >&2
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}
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show_help() {
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cat <<EOF
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Debian Reproducible Builder
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Usage:
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build.sh build <package> <version> [patch_urls...]
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Build a package with reproducible settings
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build.sh diff <package> <vuln_version> <patched_version>
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Build two versions and compute fingerprint diff
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build.sh --help
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Show this help message
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Environment:
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SOURCE_DATE_EPOCH Override timestamp (extracted from changelog if not set)
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OUTPUT_DIR Output directory (default: /output)
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DEB_BUILD_OPTIONS Additional build options
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Examples:
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build.sh build openssl 3.0.7-1
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build.sh diff curl 8.1.0-1 8.1.0-2
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EOF
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}
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setup_reproducible_env() {
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local pkg="$1"
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# Reproducible build flags
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export DEB_BUILD_OPTIONS="${DEB_BUILD_OPTIONS:-} reproducible=+all"
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export SOURCE_DATE_EPOCH="${SOURCE_DATE_EPOCH:-$(date +%s)}"
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# Compiler flags for reproducibility
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export CFLAGS="${CFLAGS:-} -fno-record-gcc-switches -fdebug-prefix-map=$(pwd)=/build"
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export CXXFLAGS="${CXXFLAGS:-} ${CFLAGS}"
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export LC_ALL=C.UTF-8
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export TZ=UTC
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log "SOURCE_DATE_EPOCH=$SOURCE_DATE_EPOCH"
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}
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fetch_source() {
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local pkg="$1"
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local ver="$2"
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log "Fetching source for $pkg=$ver"
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mkdir -p /build/src
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cd /build/src
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# Enable source repositories
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sudo sed -i 's/^# deb-src/deb-src/' /etc/apt/sources.list.d/*.sources 2>/dev/null || \
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sudo sed -i 's/^# deb-src/deb-src/' /etc/apt/sources.list 2>/dev/null || true
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sudo apt-get update
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# Fetch source
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if [ -n "$ver" ]; then
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apt-get source "${pkg}=${ver}" || apt-get source "$pkg"
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else
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apt-get source "$pkg"
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fi
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# Find extracted directory
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local src_dir=$(ls -d "${pkg}"*/ 2>/dev/null | head -1)
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if [ -z "$src_dir" ]; then
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log "ERROR: Could not find source directory for $pkg"
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return 1
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fi
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# Extract SOURCE_DATE_EPOCH from changelog
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if [ -z "${SOURCE_DATE_EPOCH:-}" ]; then
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if [ -f "$src_dir/debian/changelog" ]; then
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SOURCE_DATE_EPOCH=$(dpkg-parsechangelog -l "$src_dir/debian/changelog" -S Timestamp 2>/dev/null || date +%s)
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export SOURCE_DATE_EPOCH
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fi
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fi
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echo "$src_dir"
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}
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install_build_deps() {
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local src_dir="$1"
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log "Installing build dependencies"
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cd "$src_dir"
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sudo apt-get build-dep -y . || true
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}
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apply_patches() {
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local src_dir="$1"
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shift
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cd "$src_dir"
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for patch_url in "$@"; do
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log "Applying patch: $patch_url"
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curl -sSL "$patch_url" | patch -p1
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done
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}
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build_package() {
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local pkg="$1"
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local ver="$2"
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shift 2
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local patches="${@:-}"
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log "Building $pkg version $ver"
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setup_reproducible_env "$pkg"
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cd /build
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local src_dir=$(fetch_source "$pkg" "$ver")
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install_build_deps "$src_dir"
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if [ -n "$patches" ]; then
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apply_patches "$src_dir" $patches
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fi
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cd "$src_dir"
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# Build with reproducible settings
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dpkg-buildpackage -b -us -uc
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# Copy output
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local out_dir="$OUTPUT_DIR/$pkg-$ver"
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mkdir -p "$out_dir"
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cp -r /build/src/*.deb "$out_dir/" 2>/dev/null || true
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# Extract and fingerprint
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for deb in "$out_dir"/*.deb; do
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[ -f "$deb" ] || continue
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local deb_name=$(basename "$deb" .deb)
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mkdir -p "$out_dir/extracted/$deb_name"
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dpkg-deb -x "$deb" "$out_dir/extracted/$deb_name"
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# Extract function fingerprints
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/usr/local/bin/extract-functions.sh "$out_dir/extracted/$deb_name" > "$out_dir/$deb_name.functions.json"
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done
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log "Build complete: $out_dir"
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}
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diff_versions() {
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local pkg="$1"
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local vuln_ver="$2"
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local patched_ver="$3"
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log "Building and diffing $pkg: $vuln_ver vs $patched_ver"
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# Build vulnerable version
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build_package "$pkg" "$vuln_ver"
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# Clean build environment
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rm -rf /build/src/*
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# Build patched version
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build_package "$pkg" "$patched_ver"
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# Compute diff
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local diff_out="$OUTPUT_DIR/$pkg-diff-$vuln_ver-vs-$patched_ver.json"
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jq -s '
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.[0] as $vuln |
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.[1] as $patched |
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{
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package: "'"$pkg"'",
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vulnerable_version: "'"$vuln_ver"'",
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patched_version: "'"$patched_ver"'",
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vulnerable_functions: ($vuln | length),
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patched_functions: ($patched | length),
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added: [($patched[] | select(.name as $n | ($vuln | map(.name) | index($n)) == null))],
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removed: [($vuln[] | select(.name as $n | ($patched | map(.name) | index($n)) == null))],
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modified: [
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$vuln[] | .name as $n | .hash as $h |
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($patched[] | select(.name == $n and .hash != $h)) |
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{name: $n, vuln_hash: $h, patched_hash: .hash}
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]
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}
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' \
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"$OUTPUT_DIR/$pkg-$vuln_ver"/*.functions.json \
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"$OUTPUT_DIR/$pkg-$patched_ver"/*.functions.json \
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> "$diff_out" 2>/dev/null || log "Warning: Could not compute diff"
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log "Diff complete: $diff_out"
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}
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case "$COMMAND" in
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build)
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if [ -z "$PACKAGE" ]; then
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log "ERROR: Package required"
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show_help
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exit 1
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fi
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shift 2 # Remove command, package
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[ -n "${VERSION:-}" ] && shift # Remove version if present
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build_package "$PACKAGE" "${VERSION:-}" "$@"
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;;
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diff)
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PATCHED_VERSION="${4:-}"
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if [ -z "$PACKAGE" ] || [ -z "$VERSION" ] || [ -z "$PATCHED_VERSION" ]; then
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log "ERROR: Package, vulnerable version, and patched version required"
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show_help
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exit 1
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fi
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diff_versions "$PACKAGE" "$VERSION" "$PATCHED_VERSION"
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;;
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--help|help)
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show_help
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;;
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*)
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log "ERROR: Unknown command: $COMMAND"
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show_help
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exit 1
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;;
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esac
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@@ -0,0 +1,67 @@
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#!/bin/bash
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# Extract function fingerprints from ELF binaries
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# Outputs JSON array with function name, offset, size, and hashes
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set -euo pipefail
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DIR="${1:-.}"
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extract_functions_from_binary() {
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local binary="$1"
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# Skip non-ELF files
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file "$binary" 2>/dev/null | grep -q "ELF" || return 0
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# Get function symbols with objdump
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objdump -t "$binary" 2>/dev/null | \
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awk '/\.text.*[0-9a-f]+.*F/ {
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gsub(/\*.*\*/, "", $1)
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if ($5 != "" && length($4) > 0) {
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size = strtonum("0x" $4)
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if (size >= 16) {
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print $1, $4, $NF
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}
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}
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}' | while read -r offset size name; do
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# Skip compiler-generated symbols
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case "$name" in
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__*|_GLOBAL_*|.plt*|.text*|frame_dummy|register_tm_clones|deregister_tm_clones|_start|_init|_fini)
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continue
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;;
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esac
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# Convert hex size
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dec_size=$((16#$size))
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# Compute hash of function bytes
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local hash=$(objdump -d --start-address="0x$offset" --stop-address="$((16#$offset + dec_size))" "$binary" 2>/dev/null | \
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grep -E "^[[:space:]]*[0-9a-f]+:" | \
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awk '{for(i=2;i<=NF;i++){if($i~/^[0-9a-f]{2}$/){printf "%s", $i}}}' | \
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sha256sum | cut -d' ' -f1)
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[ -n "$hash" ] || hash="unknown"
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printf '{"name":"%s","offset":"0x%s","size":%d,"hash":"%s"}\n' \
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"$name" "$offset" "$dec_size" "$hash"
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done
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}
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# Output JSON array
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echo "["
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first=true
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find "$DIR" -type f \( -executable -o -name "*.so" -o -name "*.so.*" \) 2>/dev/null | while read -r binary; do
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file "$binary" 2>/dev/null | grep -q "ELF" || continue
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extract_functions_from_binary "$binary" | while read -r json; do
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[ -z "$json" ] && continue
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if [ "$first" = "true" ]; then
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first=false
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echo "$json"
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else
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echo ",$json"
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fi
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done
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done
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echo "]"
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29
devops/docker/repro-builders/debian/scripts/normalize.sh
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29
devops/docker/repro-builders/debian/scripts/normalize.sh
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@@ -0,0 +1,29 @@
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#!/bin/bash
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# Normalization scripts for Debian reproducible builds
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set -euo pipefail
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DIR="${1:-.}"
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log() {
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echo "[normalize] $*" >&2
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}
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normalize_archives() {
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log "Normalizing ar archives..."
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find "$DIR" -name "*.a" -type f | while read -r archive; do
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if ar --version 2>&1 | grep -q "GNU ar"; then
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ar -rcsD "$archive.tmp" "$archive" 2>/dev/null && mv "$archive.tmp" "$archive" || true
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fi
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done
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}
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strip_debug_timestamps() {
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log "Stripping debug timestamps..."
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# Handled by SOURCE_DATE_EPOCH and DEB_BUILD_OPTIONS
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}
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normalize_archives
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strip_debug_timestamps
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log "Normalization complete"
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