diff options
Diffstat (limited to 'cmdline/apt-key')
| -rwxr-xr-x | cmdline/apt-key | 69 |
1 files changed, 52 insertions, 17 deletions
diff --git a/cmdline/apt-key b/cmdline/apt-key index 048105320..de04d16da 100755 --- a/cmdline/apt-key +++ b/cmdline/apt-key @@ -9,10 +9,10 @@ GPG_CMD="gpg --ignore-time-conflict --no-options --no-default-keyring --secret-k GPG="$GPG_CMD --keyring /etc/apt/trusted.gpg" -MASTER_KEYRING="" -#MASTER_KEYRING=/usr/share/keyrings/debian-master-keyring.gpg -ARCHIVE_KEYRING=/usr/share/keyrings/debian-archive-keyring.gpg -REMOVED_KEYS=/usr/share/keyrings/debian-archive-removed-keys.gpg +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 add_keys_with_verify_against_master_keyring() { ADD_KEYRING=$1 @@ -29,34 +29,65 @@ add_keys_with_verify_against_master_keyring() { # 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 "$ARCHIVE_KEYRING_URI" ]; then + echo "ERROR: no location for the archive-keyring given" + fi + if [ ! -d /var/lib/apt/keyrings ]; then + mkdir -p /var/lib/apt/keyrings + fi + keyring=/var/lib/apt/keyrings/$(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 $ARCHIVE_KEYRING ]; then echo >&2 "ERROR: Can't find the archive-keyring" - echo >&2 "Is the debian-archive-keyring package installed?" + echo >&2 "Is the ubuntu-keyring package installed?" exit 1 fi - # add new keys, if no MASTER_KEYRING is used, use the traditional - # way - if [ -z "$MASTER_KEYRING" ]; then - $GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export | $GPG --import - else - add_keys_with_verify_against_master_keyring $ARCHIVE_KEYRING $MASTER_KEYRING - fi + # 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 + # 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 | $GPG --import # remove no-longer supported/used keys keys=`$GPG_CMD --keyring $REMOVED_KEYS --with-colons --list-keys | grep ^pub | cut -d: -f5` @@ -78,6 +109,7 @@ usage() { echo " apt-key export <keyid> - output the key <keyid>" echo " apt-key exportall - output all trusted keys" echo " apt-key update - update keys using the keyring package" + echo " apt-key net-update - update keys using the network" echo " apt-key list - list keys" echo } @@ -107,6 +139,9 @@ case "$command" in update) update ;; + net-update) + net_update + ;; list) $GPG --batch --list-keys ;; |