* doc/sources.list.5.xml:

[apt.git] / cmdline / apt-key

diff --git a/cmdline/apt-key b/cmdline/apt-key
index d716a088f81fd317a75fd6fb4fe27594e2d348f0..7bb30240e2a191d0d1fedbb7f52297534f80ca76 100755 (executable)
--- a/cmdline/apt-key
+++ b/cmdline/apt-key
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 set -e
+unset GREP_OPTIONS
 
 # We don't use a secret keyring, of course, but gpg panics and
 # implodes if there isn't one available
@@ -10,25 +11,70 @@ GPG="$GPG_CMD --keyring /etc/apt/trusted.gpg"
 
 
 MASTER_KEYRING=""
+ARCHIVE_KEYRING_URI=""
 #MASTER_KEYRING=/usr/share/keyrings/debian-master-keyring.gpg
+#ARCHIVE_KEYRING_URI=http://ftp.debian.org/debian/debian-archive-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
+    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 $ADD_KEYRING --with-colons --list-keys | grep ^pub | cut -d: -f5`
+    master_keys=`$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_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() {
@@ -38,13 +84,14 @@ 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
-    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`
@@ -66,7 +113,10 @@ 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 "  apt-key finger              - list fingerprints"
+    echo "  apt-key adv                 - pass advanced options to gpg (download key)"
     echo
 }
 
@@ -95,6 +145,9 @@ case "$command" in
     update)
        update
        ;;
+    net-update)
+       net_update
+       ;;
     list)
         $GPG --batch --list-keys
         ;;