1 files changed, 69 insertions, 0 deletions
diff --git a/modules.d/97masterkey/masterkey.sh b/modules.d/97masterkey/masterkey.sh
new file mode 100755
index 0000000..6dd6a4d
--- /dev/null
+++ b/modules.d/97masterkey/masterkey.sh
@@ -0,0 +1,69 @@
+#!/bin/sh
+
+# Licensed under the GPLv2
+#
+# Copyright (C) 2011 Politecnico di Torino, Italy
+#                    TORSEC group -- http://security.polito.it
+# Roberto Sassu <roberto.sassu@polito.it>
+
+MASTERKEYSCONFIG="${NEWROOT}/etc/sysconfig/masterkey"
+MULTIKERNELMODE="NO"
+PCRLOCKNUM=11
+
+load_masterkey() {
+    # read the configuration from the config file
+    # shellcheck disable=SC1090
+    [ -f "${MASTERKEYSCONFIG}" ] \
+        && . "${MASTERKEYSCONFIG}"
+
+    # override the kernel master key path name from the 'masterkey=' parameter
+    # in the kernel command line
+    MASTERKEYARG=$(getarg masterkey=) && MASTERKEY=${MASTERKEYARG}
+
+    # override the kernel master key type from the 'masterkeytype=' parameter
+    # in the kernel command line
+    MASTERKEYTYPEARG=$(getarg masterkeytype=) && MASTERKEYTYPE=${MASTERKEYTYPEARG}
+
+    # set default values
+    [ -z "${MASTERKEYTYPE}" ] \
+        && MASTERKEYTYPE="trusted"
+
+    if [ -z "${MASTERKEY}" ]; then
+        # append the kernel version to the default masterkey path name
+        # if MULTIKERNELMODE is set to YES
+        if [ "${MULTIKERNELMODE}" = "YES" ]; then
+            MASTERKEY="/etc/keys/kmk-${MASTERKEYTYPE}-$(uname -r).blob"
+        else
+            MASTERKEY="/etc/keys/kmk-${MASTERKEYTYPE}.blob"
+        fi
+    fi
+
+    # set the kernel master key path name
+    MASTERKEYPATH="${NEWROOT}${MASTERKEY}"
+
+    # check for kernel master key's existence
+    if [ ! -f "${MASTERKEYPATH}" ]; then
+        if [ "${RD_DEBUG}" = "yes" ]; then
+            info "masterkey: kernel master key file not found: ${MASTERKEYPATH}"
+        fi
+        return 1
+    fi
+
+    # read the kernel master key blob
+    read -r KEYBLOB < "${MASTERKEYPATH}"
+
+    # add the 'load' prefix if the key type is 'trusted'
+    [ "${MASTERKEYTYPE}" = "trusted" ] \
+        && KEYBLOB="load ${KEYBLOB} pcrlock=${PCRLOCKNUM}"
+
+    # load the kernel master key
+    info "Loading the kernel master key"
+    keyctl add "${MASTERKEYTYPE}" "kmk-${MASTERKEYTYPE}" "${KEYBLOB}" @u > /dev/null || {
+        info "masterkey: failed to load the kernel master key: kmk-${MASTERKEYTYPE}"
+        return 1
+    }
+
+    return 0
+}
+
+load_masterkey