* cmdline/apt-key:

  - add support for a master-keyring that contains signing keys
    that can be used to sign the archive signing keys. This should
    make key-rollover easier.

1 files changed, 27 insertions, 3 deletions

diff --git a/cmdline/apt-key b/cmdline/apt-key
index c7db9a25a..d716a088f 100755
--- a/cmdline/apt-key
+++ b/cmdline/apt-key
@@ -9,9 +9,27 @@ 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
 
+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
+	add_keys=`$GPG_CMD --keyring $ARCHIVE_KEYRING --with-colons --list-keys | grep ^pub | cut -d: -f5`
+	master_keys=`$GPG_CMD --keyring $MASTER_KEYRING --with-colons --list-keys | grep ^pub | cut -d: -f5`
+	for add_key in $add_keys; do
+	    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
+		fi
+	    done
+	done
+}
 
 update() {
     if [ ! -f $ARCHIVE_KEYRING ]; then
@@ -20,10 +38,15 @@ update() {
 	exit 1
     fi
 
-    # add new keys
-    $GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export | $GPG --import
+    # add new keys, if no MASTER_KEYRING is used, use the traditional
+    # way
+    if [ -z "$MASTER_KEYRING" ]; then
+	$GPG_CMD --quiet --batch --keyring $ARCHIVE_KEYRING --export | $GPG --import
+    else
+	add_keys_with_verify_against_master_keyring
+    fi
 
-    # remove no-longer used keys
+    # 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
@@ -32,6 +55,7 @@ update() {
     done
 }
 
+
 usage() {
     echo "Usage: apt-key [command] [arguments]"
     echo