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scripts: add download-check-artifact.sh script
While checking wiki documentation about GPG signatures checking I found this nice script and I've thought, that it would be nice to provide it officially instead of some random internet site. Usage example: $ ./scripts/download-check-artifact.sh https://downloads.openwrt.org/snapshots/targets/mediatek/filogic/openwrt-mediatek-filogic-openwrt_one-squashfs-sysupgrade.itb 1) Downloading image file ========================= ########################################### 100.0% 2) Downloading checksum file ============================ ########################################### 100.0% 3) Downloading the GPG signature ================================ ########################################### 100.0% 4) Verifying GPG signature ========================== gpg: Signature made Tue 05 Nov 2024 05:21:50 PM UTC gpg: using EDDSA key 92C561DE55AE6552F3C736B82B0151090606D1D9 gpg: Good signature from "OpenWrt Build System (Nitrokey3) <contact@openwrt.org>" [ultimate] Primary key fingerprint: 8A8B C12F 46B8 36C0 F9CD B36F 1D53 D187 7742 E911 Subkey fingerprint: 92C5 61DE 55AE 6552 F3C7 36B8 2B01 5109 0606 D1D9 5) Verifying SHA256 checksum ============================ openwrt-mediatek-filogic-openwrt_one-squashfs-sysupgrade.itb: OK Verification done! ================== Downloaded artifact placed in '/var/home/ynezz/dev/openwrt/openwrt.git/openwrt-mediatek-filogic-openwrt_one-squashfs-sysupgrade.itb' Cleaning up. Adding file in a state as downloaded from https://www.abitare.org/bin/download.sh References: https://openwrt.org/docs/guide-quick-start/verify_firmware_checksum?s[]=gpg#linux Signed-off-by: David S. H. Rosenthal <dshr@abitare.org> Link: https://github.com/openwrt/openwrt/pull/16871 Signed-off-by: Petr Štetiar <ynezz@true.cz>
This commit is contained in:
David S. H. Rosenthal
Petr Štetiar
parent
c6a3a11c07
commit
4c9031fda2
154
scripts/download-check-artifact.sh
Executable file
154
scripts/download-check-artifact.sh
Executable file
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#!/usr/bin/env bash
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# Script to perform verified file downloads.
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# Exit codes:
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# 0 - File downloaded successfully and verified
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# 1 - Failed to download requested file
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# 2 - Failed to download sha256sums file
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# 3 - Failed to download sha256sums.gpg file
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# 4 - GnuPG is available but fails to verify the signature (missing pubkey, file integrity error, ...)
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# 5 - The checksums do not match
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# 6 - Unable to copy the requested file to its final destination
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# 254 - The script got interrupted by a signal
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# 255 - A suitable download or checksum utility is missing
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[ -n "$1" ] || {
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echo "Usage: $0 <url>" >&2
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exit 1
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}
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finish() {
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[ -e "/tmp/verify.$$" ] && {
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echo "Cleaning up."
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rm -r "/tmp/verify.$$"
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}
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exit $1
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}
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trap "finish 254" INT TERM
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destdir="$(pwd)"
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image_url="$1"
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image_file="${image_url##*/}"
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sha256_url="${image_url%/*}/sha256sums"
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gpgsig_url="${image_url%/*}/sha256sums.asc"
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keyserver_url="hkp://keyserver.ubuntu.com"
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# Find a suitable download utility
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if which curl >/dev/null; then
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download() { curl --progress-bar -o "$1" "$2"; }
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elif which wget >/dev/null; then
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download() { wget -O "$1" "$2"; }
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elif which fetch >/dev/null; then
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download() { fetch -o "$1" "$2"; }
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else
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echo "No suitable download utility found, cannot download files!" >&2
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finish 255
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fi
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# Find a suitable checksum utility
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if which sha256sum >/dev/null; then
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checksum() { sha256sum -c --ignore-missing "sha256sums"; }
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elif which shasum >/dev/null; then
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checksum() {
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local sum="$(shasum -a 256 "$image_file")";
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grep -xF "${sum%% *} *$image_file" "sha256sums";
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}
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else
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echo "No SHA256 checksum executable installed, cannot verify checksums!" >&2
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finish 255
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fi
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# Check for gpg availability
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if which gpg >/dev/null; then
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runpgp() { gpg "$@"; }
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else
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runpgp() {
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echo "WARNING: No GnuPG installed, cannot verify digital signature!" >&2
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return 0
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}
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fi
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mkdir -p "/tmp/verify.$$"
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cd "/tmp/verify.$$"
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echo ""
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echo "1) Downloading image file"
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echo "========================="
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download "$image_file" "$image_url" || {
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echo "Failed to download image file!" >&2
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finish 1
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}
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echo ""
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echo "2) Downloading checksum file"
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echo "============================"
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download "sha256sums" "$sha256_url" || {
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echo "Failed to download checksum file!" >&2
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finish 2
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}
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echo ""
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echo "3) Downloading the GPG signature"
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echo "================================"
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download "sha256sums.gpg" "$gpgsig_url" || {
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echo "Failed to download GPG signature!" >&2
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finish 3
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}
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echo ""
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echo "4) Verifying GPG signature"
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echo "=========================="
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missing_key=$(runpgp --status-fd 1 --with-fingerprint --verify \
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"sha256sums.gpg" "sha256sums" 2>/dev/null | sed -ne 's!^.* NO_PUBKEY !!p')
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if [ -n "$missing_key" ]; then
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echo "The signature was signed by a public key with the id $missing_key" >&2
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echo "which is not present on this system." >&2
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echo "" >&2
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echo "Provide a public keyserver url below or press enter to accept the" >&2
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echo "default suggestion. Hit Ctrl-C to abort the operation." >&2
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echo "" >&2
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while true; do
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printf "Keyserver to use? [$keyserver_url] > "
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read url; case "${url:-$keyserver_url}" in
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hkp://*)
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gpg --keyserver "${url:-$keyserver_url}" --recv-keys "$missing_key" || {
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echo "Failed to download public key." >&2
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finish 7
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}
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break
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;;
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*)
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echo "Expecting a key server url in the form 'hkp://hostname'." >&2
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;;
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esac
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done
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fi
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runpgp --with-fingerprint --verify "sha256sums.gpg" "sha256sums" || {
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echo "Failed to verify checksum file with GPG signature!" >&2
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finish 4
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}
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echo ""
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echo "5) Verifying SHA256 checksum"
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echo "============================"
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checksum || {
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echo "Checksums do not match!" >&2
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finish 5
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}
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cp "$image_file" "$destdir/$image_file" || {
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echo "Failed to write '$destdir/$image_file'" >&2
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finish 6
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}
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echo ""
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echo "Verification done!"
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echo "=================="
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echo "Firmware image placed in '$destdir/$image_file'."
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echo ""
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finish 0
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