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#!/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 "$ARCHIVE_KEYRING_URI" ]; then
echo "ERROR: no location for the archive-keyring given"
exit 1
fi
# in theory we would need to depend on wget for this, but this feature
# isn't useable in debian anyway as we have no keyring uri nor a master key
if ! which wget >/dev/null 2>&1; then
echo "ERROR: an installed wget is required for a network-based update"
exit 1
fi
if [ ! -d /var/lib/apt/keyrings ]; then
mkdir -p /var/lib/apt/keyrings
fi
keyring=/var/lib/apt/keyrings/$(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
# 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 [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
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