#!/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="$GPG_CMD --keyring /etc/apt/trusted.gpg"
-
+GPG="$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
# when adding new keys, make sure that the archive-master-keyring
# is honored. so:
- # all keys that are exported and have the name
- # "Ubuntu Archive Automatic Signing Key" must have a valid signature
- # from a key in the ubuntu-master-keyring
+ # 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 --list-sigs --with-colons $add_key | grep ^sig | cut -d: -f5 | grep -q $master_key; then
- $GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export $add_key | $GPG --import
+ 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 $ARCHIVE_KEYRING ]; then
echo >&2 "ERROR: Can't find the archive-keyring"
exit 1
fi
- # add new keys, if no MASTER_KEYRING is used, use the traditional
- # way
- if [ -z "$MASTER_KEYRING" ]; then
- $GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export | $GPG --import
+ # 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
- add_keys_with_verify_against_master_keyring $ARCHIVE_KEYRING $MASTER_KEYRING
+ echo "Warning: removed keys keyring $REMOVED_KEYS missing or not readable" >&2
fi
-
- # remove no-longer supported/used keys
- keys=`$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 "Usage: apt-key [--keyring file] [command] [arguments]"
echo
echo "Manage apt's list of trusted keys"
echo
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" ]; 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 $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring)
+ if [ -r "$TRUSTEDFILE" ]; then
+ GPG="$GPG --keyring $TRUSTEDFILE"
+ fi
+ GPG="$GPG --primary-keyring $TRUSTEDFILE"
+ TRUSTEDPARTS="/etc/apt/trusted.gpg.d"
+ if [ -d "$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
update)
update
;;
+ net-update)
+ net_update
+ ;;
list)
$GPG --batch --list-keys
;;
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