Dropped Debian revision '-1' from build dependency on 'doc-base'.

[ntk/apt.git] / cmdline / apt-key

diff --git a/cmdline/apt-key b/cmdline/apt-key
index bbf3a76..94c1149 100755 (executable)
--- a/cmdline/apt-key
+++ b/cmdline/apt-key
@@ -32,9 +32,8 @@ 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
@@ -61,8 +60,20 @@ net_update() {
     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 $ARCHIVE_KEYRING_URI)
-    add_keys_with_verify_against_master_keyring /var/lib/apt/keyrings/$(basename $ARCHIVE_KEYRING) $MASTER_KEYRING
+    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() {
@@ -72,13 +83,14 @@ update() {
        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 "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`
@@ -102,6 +114,8 @@ usage() {
     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
 }