#!/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 SECRETKEYRING="$(mktemp)" trap "rm -f '${SECRETKEYRING}'" 0 HUP INT QUIT ILL ABRT FPE SEGV PIPE TERM GPG_CMD="gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring ${SECRETKEYRING}" if [ "$(id -u)" -eq 0 ]; then # we could use a tmpfile here too, but creation of this tends to be time-consuming GPG_CMD="$GPG_CMD --trustdb-name /etc/apt/trustdb.gpg" fi GPG="$GPG_CMD" 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 requires_root() { if [ "$(id -u)" -ne 0 ]; then echo >&1 "ERROR: This command can only be used by root." exit 1 fi } 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 "$ARCHIVE_KEYRING_URI" ]; then echo >&2 "ERROR: Your distribution is not supported in net-update as no uri for the archive-keyring is set" exit 1 fi requires_root # in theory we would need to depend on wget for this, but this feature # isn't useable in debian anyway as we have no keyring uri nor a master key if ! which wget >/dev/null 2>&1; then echo >&2 "ERROR: an installed wget is required for a network-based update" exit 1 fi if [ ! -d /var/lib/apt/keyrings ]; then mkdir -p /var/lib/apt/keyrings fi keyring=/var/lib/apt/keyrings/$(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 requires_root # 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 | $GPG --import if [ -r "$REMOVED_KEYS" ]; then # 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 else echo "Warning: removed keys keyring $REMOVED_KEYS missing or not readable" >&2 fi } usage() { echo "Usage: apt-key [--keyring file] [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 echo "If no specific keyring file is given the command applies to all keyring files." } # Determine on which keyring we want to work if [ "$1" = "--keyring" ]; then #echo "keyfile given" shift TRUSTEDFILE="$1" if [ -r "$TRUSTEDFILE" ] || [ "$2" = 'add' ]; then GPG="$GPG --keyring $TRUSTEDFILE --primary-keyring $TRUSTEDFILE" else echo >&2 "Error: The specified keyring »$TRUSTEDFILE« is missing or not readable" exit 1 fi shift # otherwise use the default else #echo "generate list" TRUSTEDFILE="/etc/apt/trusted.gpg" eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring) eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f) if [ -r "$TRUSTEDFILE" ]; then GPG="$GPG --keyring $TRUSTEDFILE" fi GPG="$GPG --primary-keyring $TRUSTEDFILE" TRUSTEDPARTS="/etc/apt/trusted.gpg.d" eval $(apt-config shell TRUSTEDPARTS Dir::Etc::TrustedParts/d) if [ -d "$TRUSTEDPARTS" ]; then #echo "parts active" for trusted in $(run-parts --list $TRUSTEDPARTS --regex '^.*\.gpg$'); do #echo "part -> $trusted" GPG="$GPG --keyring $trusted" done fi fi #echo "COMMAND: $GPG" 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) requires_root $GPG --quiet --batch --import "$1" echo "OK" ;; del|rm|remove) requires_root $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