X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/7db98ffceda347f0bc457c6bdc4ff33d60e26b18..45b5cb269dccfb8835901b54701a96237a84bf26:/cmdline/apt-key

diff --git a/cmdline/apt-key b/cmdline/apt-key
old mode 100644
new mode 100755
index 583cde191..7bb30240e
--- a/cmdline/apt-key
+++ b/cmdline/apt-key
@@ -1,6 +1,107 @@
 #!/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
+
+GPG_CMD="gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg"
+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() {
+    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() {
+    if [ ! -f $ARCHIVE_KEYRING ]; then
+	echo >&2 "ERROR: Can't find the archive-keyring"
+	echo >&2 "Is the debian-archive-keyring package installed?"
+	exit 1
+    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`
+    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
+}
+
 
 usage() {
     echo "Usage: apt-key [command] [arguments]"
@@ -9,7 +110,13 @@ usage() {
     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
 }
 
@@ -26,11 +133,6 @@ if [ "$command" != "help" ] && ! which gpg >/dev/null 2>&1; then
     echo >&2
 fi
 
-# We don't use a secret keyring, of course, but gpg panics and
-# implodes if there isn't one available
-
-GPG="gpg --no-options --no-default-keyring --keyring /etc/apt/trusted.gpg --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg"
-
 case "$command" in
     add)
         $GPG --quiet --batch --import "$1"
@@ -40,12 +142,24 @@ case "$command" in
         $GPG --quiet --batch --delete-key --yes "$1"
         echo "OK"
         ;;
+    update)
+	update
+	;;
+    net-update)
+	net_update
+	;;
     list)
         $GPG --batch --list-keys
         ;;
     finger*)
         $GPG --batch --fingerprint
         ;;
+    export)
+        $GPG --armor --export "$1"
+        ;;
+    exportall)
+        $GPG --armor --export
+        ;;
     adv*)
         echo "Executing: $GPG $*"
         $GPG $*