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"
-GPG_CMD="gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg"
-GPG="$GPG_CMD --keyring /etc/apt/trusted.gpg"
+# gpg needs a trustdb to function, but it can't be invalid (not even empty)
+# so we create a temporary directory to store our fresh readable trustdb in
+TRUSTDBDIR="$(mktemp -d)"
+CURRENTTRAP="${CURRENTTRAP} rm -rf '${TRUSTDBDIR}';"
+trap "${CURRENTTRAP}" 0 HUP INT QUIT ILL ABRT FPE SEGV PIPE TERM
+chmod 700 "$TRUSTDBDIR"
+# We also don't use a secret keyring, of course, but gpg panics and
+# implodes if there isn't one available - and writeable for imports
+SECRETKEYRING="${TRUSTDBDIR}/secring.gpg"
+touch $SECRETKEYRING
+GPG_CMD="$GPG_CMD --secret-keyring $SECRETKEYRING"
+GPG_CMD="$GPG_CMD --trustdb-name ${TRUSTDBDIR}/trustdb.gpg"
+# now create the trustdb with an (empty) dummy keyring
+$GPG_CMD --quiet --check-trustdb --keyring $SECRETKEYRING
+# and make sure that gpg isn't trying to update the file
+GPG_CMD="$GPG_CMD --no-auto-check-trustdb --trust-model always"
-MASTER_KEYRING=/usr/share/keyrings/ubuntu-master-keyring.gpg
-ARCHIVE_KEYRING=/usr/share/keyrings/ubuntu-archive-keyring.gpg
-REMOVED_KEYS=/usr/share/keyrings/ubuntu-archive-removed-keys.gpg
-ARCHIVE_KEYRING_URI=http://archive.ubuntu.com/ubuntu/project/ubuntu-archive-keyring.gpg
+GPG="$GPG_CMD"
+
+MASTER_KEYRING=""
+#MASTER_KEYRING=/usr/share/keyrings/debian-master-keyring.gpg
+eval $(apt-config shell MASTER_KEYRING APT::Key::MasterKeyring)
+ARCHIVE_KEYRING_URI=""
+#ARCHIVE_KEYRING_URI=http://ftp.debian.org/debian/debian-archive-keyring.gpg
+eval $(apt-config shell ARCHIVE_KEYRING_URI APT::Key::ArchiveKeyringURI)
+
+ARCHIVE_KEYRING=/usr/share/keyrings/debian-archive-keyring.gpg
+eval $(apt-config shell ARCHIVE_KEYRING APT::Key::ArchiveKeyring)
+REMOVED_KEYS=/usr/share/keyrings/debian-archive-removed-keys.gpg
+eval $(apt-config shell REMOVED_KEYS APT::Key::RemovedKeys)
+
+requires_root() {
+ if [ "$(id -u)" -ne 0 ]; then
+ echo >&1 "ERROR: This command can only be used by root."
+ exit 1
+ fi
+}
+
+# gpg defaults to mode 0600 for new keyrings. Create one with 0644 instead.
+init_keyring() {
+ for path; do
+ if ! [ -e "$path" ]; then
+ touch -- "$path"
+ chmod 0644 -- "$path"
+ fi
+ done
+}
add_keys_with_verify_against_master_keyring() {
ADD_KEYRING=$1
# (otherwise it does not make sense from a security POV)
net_update() {
if [ -z "$ARCHIVE_KEYRING_URI" ]; then
- echo "ERROR: no location for the archive-keyring given"
+ 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
update() {
if [ ! -f $ARCHIVE_KEYRING ]; then
echo >&2 "ERROR: Can't find the archive-keyring"
- echo >&2 "Is the ubuntu-keyring package installed?"
+ echo >&2 "Is the debian-archive-keyring package installed?"
exit 1
fi
+ requires_root
# add new keys from the package;
# we do not use add_keys_with_verify_against_master_keyring here,
- # because we "update" is run on regular package updates. A
+ # because "update" is run on regular package updates. A
# attacker might as well replace the master-archive-keyring file
# in the package and add his own keys. so this check wouldn't
# add any security. we *need* this check on net-update though
fi
}
+remove_key_from_keyring() {
+ local GPG="$GPG_CMD --keyring $1"
+ # check if the key is in this keyring: the key id is in the 5 column at the end
+ if ! $GPG --with-colons --list-keys 2>&1 | grep -q "^pub:[^:]*:[^:]*:[^:]*:[0-9A-F]\+$2:"; then
+ return
+ fi
+ if [ ! -w "$1" ]; then
+ echo >&2 "Key ${2} is in keyring ${1}, but can't be removed as it is read only."
+ return
+ fi
+ # check if it is the only key in the keyring and if so remove the keyring alltogether
+ if [ '1' = "$($GPG --with-colons --list-keys | grep "^pub:[^:]*:[^:]*:[^:]*:[0-9A-F]\+:" | wc -l)" ]; then
+ mv -f "$1" "${1}~" # behave like gpg
+ return
+ fi
+ # we can't just modify pointed to files as these might be in /usr or something
+ local REALTARGET
+ if [ -L "$1" ]; then
+ REALTARGET="$(readlink -f "$1")"
+ mv -f "$1" "${1}.dpkg-tmp"
+ cp -a "$REALTARGET" "$1"
+ ls "$(dirname $1)"
+ fi
+ # delete the key from the keyring
+ $GPG --batch --delete-key --yes "$2"
+ if [ -n "$REALTARGET" ]; then
+ # the real backup is the old link, not the copy we made
+ mv -f "${1}.dpkg-tmp" "${1}~"
+ fi
+}
+
+remove_key() {
+ requires_root
+
+ # if a --keyring was given, just remove from there
+ if [ -n "$FORCED_KEYRING" ]; then
+ remove_key_from_keyring "$FORCED_KEYRING" "$1"
+ else
+ # otherwise all known keyrings are up for inspection
+ local TRUSTEDFILE="/etc/apt/trusted.gpg"
+ eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring)
+ eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f)
+ remove_key_from_keyring "$TRUSTEDFILE" "$1"
+ TRUSTEDPARTS="/etc/apt/trusted.gpg.d"
+ eval $(apt-config shell TRUSTEDPARTS Dir::Etc::TrustedParts/d)
+ if [ -d "$TRUSTEDPARTS" ]; then
+ for trusted in $(run-parts --list "$TRUSTEDPARTS" --regex '^.*\.gpg$'); do
+ remove_key_from_keyring "$trusted" "$1"
+ done
+ fi
+ fi
+ echo "OK"
+}
+
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 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."
}
+while [ -n "$1" ]; do
+ case "$1" in
+ --keyring)
+ shift
+ TRUSTEDFILE="$1"
+ FORCED_KEYRING="$1"
+ if [ -r "$TRUSTEDFILE" ] || [ "$2" = 'add' ] || [ "$2" = 'adv' ]; then
+ GPG="$GPG --keyring $TRUSTEDFILE --primary-keyring $TRUSTEDFILE"
+ else
+ echo >&2 "Error: The specified keyring »$TRUSTEDFILE« is missing or not readable"
+ exit 1
+ fi
+ shift
+ ;;
+ --fakeroot)
+ requires_root() { true; }
+ shift
+ ;;
+ --*)
+ echo >&2 "Unknown option: $1"
+ usage
+ exit 1;;
+ *)
+ break;;
+ esac
+done
+
+if [ -z "$TRUSTEDFILE" ]; then
+ 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
+ # strip / suffix as gpg will double-slash in that case (#665411)
+ STRIPPED_TRUSTEDPARTS="${TRUSTEDPARTS%/}"
+ if [ "${STRIPPED_TRUSTEDPARTS}/" = "$TRUSTEDPARTS" ]; then
+ TRUSTEDPARTS="$STRIPPED_TRUSTEDPARTS"
+ fi
+ for trusted in $(run-parts --list "$TRUSTEDPARTS" --regex '^.*\.gpg$'); do
+ GPG="$GPG --keyring $trusted"
+ done
+ fi
+fi
+
command="$1"
if [ -z "$command" ]; then
usage
case "$command" in
add)
+ requires_root
+ init_keyring "$TRUSTEDFILE"
$GPG --quiet --batch --import "$1"
echo "OK"
;;
del|rm|remove)
- $GPG --quiet --batch --delete-key --yes "$1"
- echo "OK"
+ init_keyring "$TRUSTEDFILE"
+ remove_key "$1"
;;
update)
+ init_keyring "$TRUSTEDFILE"
update
;;
net-update)
+ init_keyring "$TRUSTEDFILE"
net_update
;;
list)
+ init_keyring "$TRUSTEDFILE"
$GPG --batch --list-keys
;;
finger*)
+ init_keyring "$TRUSTEDFILE"
$GPG --batch --fingerprint
;;
export)
+ init_keyring "$TRUSTEDFILE"
$GPG --armor --export "$1"
;;
exportall)
+ init_keyring "$TRUSTEDFILE"
$GPG --armor --export
;;
adv*)
+ init_keyring "$TRUSTEDFILE"
echo "Executing: $GPG $*"
$GPG $*
;;
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