#!/bin/sh set -e unset GREP_OPTIONS # We don't use a secret keyring, of course, but gpg panics and # implodes if there isn't one available GPG_CMD="gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg" GPG="$GPG_CMD --keyring /etc/apt/trusted.gpg" MASTER_KEYRING="" ARCHIVE_KEYRING_URI="" #MASTER_KEYRING=/usr/share/keyrings/debian-master-keyring.gpg #ARCHIVE_KEYRING_URI=http://ftp.debian.org/debian/debian-archive-keyring.gpg ARCHIVE_KEYRING=/usr/share/keyrings/debian-archive-keyring.gpg REMOVED_KEYS=/usr/share/keyrings/debian-archive-removed-keys.gpg add_keys_with_verify_against_master_keyring() { ADD_KEYRING=$1 MASTER=$2 if [ ! -f "$ADD_KEYRING" ]; then echo "ERROR: '$ADD_KEYRING' not found" return fi if [ ! -f "$MASTER" ]; then echo "ERROR: '$MASTER' not found" return fi # when adding new keys, make sure that the archive-master-keyring # is honored. so: # all keys that are exported must have a valid signature # from a key in the $distro-master-keyring add_keys=`$GPG_CMD --keyring $ADD_KEYRING --with-colons --list-keys | grep ^pub | cut -d: -f5` master_keys=`$GPG_CMD --keyring $MASTER --with-colons --list-keys | grep ^pub | cut -d: -f5` for add_key in $add_keys; do ADDED=0 for master_key in $master_keys; do if $GPG_CMD --keyring $ADD_KEYRING --list-sigs --with-colons $add_key | grep ^sig | cut -d: -f5 | grep -q $master_key; then $GPG_CMD --quiet --batch --keyring $ADD_KEYRING --export $add_key | $GPG --import ADDED=1 fi done if [ $ADDED = 0 ]; then echo >&2 "Key '$add_key' not added. It is not signed with a master key" fi done } # update the current archive signing keyring from a network URI # the archive-keyring keys needs to be signed with the master key # (otherwise it does not make sense from a security POV) net_update() { if [ -z "$ARCHIVE_KEYRING_URI" ]; then echo "ERROR: no location for the archive-keyring given" fi if [ ! -d /var/lib/apt/keyrings ]; then mkdir -p /var/lib/apt/keyrings fi keyring=/var/lib/apt/keyrings/$(basename $ARCHIVE_KEYRING) old_mtime=0 if [ -e $keyring ]; then old_mtime=$(stat -c %Y $keyring) fi (cd /var/lib/apt/keyrings; wget -q -N $ARCHIVE_KEYRING_URI) if [ ! -e $keyring ]; then return fi new_mtime=$(stat -c %Y $keyring) if [ $new_mtime -ne $old_mtime ]; then echo "Checking for new archive signing keys now" add_keys_with_verify_against_master_keyring $keyring $MASTER_KEYRING fi } update() { if [ ! -f $ARCHIVE_KEYRING ]; then echo >&2 "ERROR: Can't find the archive-keyring" echo >&2 "Is the debian-archive-keyring package installed?" exit 1 fi # add new keys from the package; # we do not use add_keys_with_verify_against_master_keyring here, # because "update" is run on regular package updates. A # attacker might as well replace the master-archive-keyring file # in the package and add his own keys. so this check wouldn't # add any security. we *need* this check on net-update though $GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export | $GPG --import # remove no-longer supported/used keys keys=`$GPG_CMD --keyring $REMOVED_KEYS --with-colons --list-keys | grep ^pub | cut -d: -f5` for key in $keys; do if $GPG --list-keys --with-colons | grep ^pub | cut -d: -f5 | grep -q $key; then $GPG --quiet --batch --delete-key --yes ${key} fi done } usage() { echo "Usage: apt-key [command] [arguments]" echo echo "Manage apt's list of trusted keys" echo echo " apt-key add <file> - add the key contained in <file> ('-' for stdin)" echo " apt-key del <keyid> - remove the key <keyid>" echo " apt-key export <keyid> - output the key <keyid>" echo " apt-key exportall - output all trusted keys" echo " apt-key update - update keys using the keyring package" echo " apt-key net-update - update keys using the network" echo " apt-key list - list keys" echo " apt-key finger - list fingerprints" echo " apt-key adv - pass advanced options to gpg (download key)" echo } command="$1" if [ -z "$command" ]; then usage exit 1 fi shift if [ "$command" != "help" ] && ! which gpg >/dev/null 2>&1; then echo >&2 "Warning: gnupg does not seem to be installed." echo >&2 "Warning: apt-key requires gnupg for most operations." echo >&2 fi case "$command" in add) $GPG --quiet --batch --import "$1" echo "OK" ;; del|rm|remove) $GPG --quiet --batch --delete-key --yes "$1" echo "OK" ;; update) update ;; net-update) net_update ;; list) $GPG --batch --list-keys ;; finger*) $GPG --batch --fingerprint ;; export) $GPG --armor --export "$1" ;; exportall) $GPG --armor --export ;; adv*) echo "Executing: $GPG $*" $GPG $* ;; help) usage ;; *) usage exit 1 ;; esac