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- #!/bin/sh
- set -e
- unset GREP_OPTIONS
- GPG_CMD="gpg --ignore-time-conflict --no-options --no-default-keyring"
- # gpg needs (in different versions more or less) files to function correctly,
- # so we give it its own homedir and generate some valid content for it
- GPGHOMEDIR="$(mktemp -d)"
- CURRENTTRAP="${CURRENTTRAP} rm -rf '${GPGHOMEDIR}';"
- trap "${CURRENTTRAP}" 0 HUP INT QUIT ILL ABRT FPE SEGV PIPE TERM
- chmod 700 "$GPGHOMEDIR"
- # We don't use a secret keyring, of course, but gpg panics and
- # implodes if there isn't one available - and writeable for imports
- SECRETKEYRING="${GPGHOMEDIR}/secring.gpg"
- touch $SECRETKEYRING
- GPG_CMD="$GPG_CMD --homedir $GPGHOMEDIR"
- # create the trustdb with an (empty) dummy keyring
- # older gpgs required it, newer gpgs even warn that it isn't needed,
- # but require it nonetheless for some commands, so we just play safe
- # here for the foreseeable future and create a dummy one
- $GPG_CMD --quiet --check-trustdb --keyring $SECRETKEYRING >/dev/null 2>&1
- # tell gpg that it shouldn't try to maintain a trustdb file
- GPG_CMD="$GPG_CMD --no-auto-check-trustdb --trust-model always"
- GPG="$GPG_CMD"
- APT_DIR="/"
- eval $(apt-config shell APT_DIR Dir)
- MASTER_KEYRING='&keyring-master-filename;'
- eval $(apt-config shell MASTER_KEYRING APT::Key::MasterKeyring)
- ARCHIVE_KEYRING='&keyring-filename;'
- eval $(apt-config shell ARCHIVE_KEYRING APT::Key::ArchiveKeyring)
- REMOVED_KEYS='&keyring-removed-filename;'
- eval $(apt-config shell REMOVED_KEYS APT::Key::RemovedKeys)
- ARCHIVE_KEYRING_URI='&keyring-uri;'
- eval $(apt-config shell ARCHIVE_KEYRING_URI APT::Key::ArchiveKeyringURI)
- TMP_KEYRING=${APT_DIR}/var/lib/apt/keyrings/maybe-import-keyring.gpg
- 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
- 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 $ADD_KEYRING --with-colons --list-keys | grep ^pub | cut -d: -f5`
- all_add_keys=`$GPG_CMD --keyring $ADD_KEYRING --with-colons --list-keys | grep ^[ps]ub | cut -d: -f5`
- master_keys=`$GPG_CMD --keyring $MASTER --with-colons --list-keys | grep ^pub | cut -d: -f5`
- # ensure there are no colisions LP: #857472
- for all_add_key in $all_add_keys; do
- for master_key in $master_keys; do
- if [ "$all_add_key" = "$master_key" ]; then
- echo >&2 "Keyid collision for '$all_add_key' detected, operation aborted"
- return 1
- fi
- done
- done
-
- for add_key in $add_keys; do
- # export the add keyring one-by-one
- rm -f $TMP_KEYRING
- $GPG_CMD --keyring $ADD_KEYRING --output $TMP_KEYRING --export $add_key
- # check if signed with the master key and only add in this case
- ADDED=0
- for master_key in $master_keys; do
- if $GPG_CMD --keyring $MASTER --keyring $TMP_KEYRING --check-sigs --with-colons $add_key | grep '^sig:!:' | cut -d: -f5 | grep -q $master_key; then
- $GPG --import $TMP_KEYRING
- 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
- rm -f $TMP_KEYRING
- }
- # 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() {
- # Disabled for now as code is insecure (LP: #1013639 (and 857472, 1013128))
- APT_KEY_NET_UPDATE_ENABLED=""
- eval $(apt-config shell APT_KEY_NET_UPDATE_ENABLED APT::Key::Net-Update-Enabled)
- if [ -z "$APT_KEY_NET_UPDATE_ENABLED" ]; then
- exit 1
- fi
- 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 ${APT_DIR}/var/lib/apt/keyrings ]; then
- mkdir -p ${APT_DIR}/var/lib/apt/keyrings
- fi
- keyring=${APT_DIR}/var/lib/apt/keyrings/$(basename $ARCHIVE_KEYRING_URI)
- old_mtime=0
- if [ -e $keyring ]; then
- old_mtime=$(stat -c %Y $keyring)
- fi
- (cd ${APT_DIR}/var/lib/apt/keyrings; wget --timeout=90 -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 &keyring-package; 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 $REMOVED_KEYS missing or not readable" >&2
- fi
- }
- remove_key_from_keyring() {
- local GPG="$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 ${1}, but can't be removed as it is read only."
- return
- fi
- # check if it is the only key in the keyring and if so remove the keyring altogether
- if [ '1' = "$($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 [--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."
- }
- 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
- 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
- init_keyring "$TRUSTEDFILE"
- $GPG --quiet --batch --import "$1"
- echo "OK"
- ;;
- del|rm|remove)
- init_keyring "$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 $*
- ;;
- help)
- usage
- ;;
- *)
- usage
- exit 1
- ;;
- esac
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