summaryrefslogtreecommitdiff
path: root/cmdline/apt-key.in
diff options
context:
space:
mode:
Diffstat (limited to 'cmdline/apt-key.in')
-rw-r--r--cmdline/apt-key.in362
1 files changed, 362 insertions, 0 deletions
diff --git a/cmdline/apt-key.in b/cmdline/apt-key.in
new file mode 100644
index 000000000..0774cf4b7
--- /dev/null
+++ b/cmdline/apt-key.in
@@ -0,0 +1,362 @@
+#!/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