New EncryptionMethod using fde-tools for TPM-based unlocking

package/yast2-storage-ng.spec

@@ -25,8 +25,8 @@ Url:            https://github.com/yast/yast-storage-ng
 
 Source:         %{name}-%{version}.tar.bz2
 
-# New Md size calculation
-BuildRequires:	libstorage-ng-ruby >= 4.4.76
+# Encryption#use_key_file_in_commit
+BuildRequires:	libstorage-ng-ruby >= 4.5.144
 BuildRequires:  update-desktop-files
 # Replace PackageSystem with Package
 BuildRequires:  yast2 >= 4.4.38
@@ -47,8 +47,8 @@ BuildRequires:  rubygem(%{rb_default_ruby_abi}:parallel_tests)
 
 # findutils for xargs
 Requires:       findutils
-# New Md size calculation
-Requires:       libstorage-ng-ruby >= 4.4.76
+# Encryption#use_key_file_in_commit
+Requires:       libstorage-ng-ruby >= 4.5.144
 # Replace PackageSystem with Package
 Requires:       yast2 >= 4.4.38
 # Y2Packager::Repository

src/lib/y2partitioner/widgets/overview.rb

@@ -1,4 +1,4 @@
-# Copyright (c) [2017-2022] SUSE LLC
+# Copyright (c) [2017-2023] SUSE LLC
 #
 # All Rights Reserved.
 #
@@ -209,13 +209,15 @@ def valid_setup?
       #
       # As a side effect, it will ask the user to install missing packages.
       #
-      # @see Y2Storage::UsedStorageFeatures
+      # @see Y2Storage::StorageFeature
       #
       # @return [Boolean]
       def packages_installed?
         return true if Yast::Mode.installation
 
-        pkgs = device_graph.actiongraph.used_features.pkg_list
+        features = device_graph.actiongraph.used_features
+        features.concat(device_graph.yast_commit_features)
+        pkgs = features.pkg_list
         Y2Storage::PackageHandler.new(pkgs).install
       end
 

src/lib/y2storage/devicegraph.rb

@@ -1,4 +1,4 @@
-# Copyright (c) [2017-2021] SUSE LLC
+# Copyright (c) [2017-2023] SUSE LLC
 #
 # All Rights Reserved.
 #
@@ -594,12 +594,19 @@ def finish_installation
 
     # List of storage features used by the devicegraph
     #
+    # Note this is used during system installation. In the installed system, the
+    # combination of Actiongraph#used_features and Devicegraph#yast_commit_features
+    # is used instead.
+    #
     # By default, it returns the features associated to all devices and filesystems
     # in the devicegraph. The required_only argument can be used to limit the result
-    # by excluding features associated to those filesystems that have no mount point.
+    # by excluding features that are not mandatory to produce a functional system. For
+    # example, it excludes features associated to those filesystems that have no mount
+    # point.
     #
     # @param required_only [Boolean] whether the result should only include those
-    #   features that are mandatory (ie. associated to devices with a mount point)
+    #   features that are mandatory (ie. associated to devices with a mount point or
+    #   to devices that will be configured during the first boot of the new system)
     # @return [StorageFeaturesList]
     def used_features(required_only: false)
       type =
@@ -609,7 +616,9 @@ def used_features(required_only: false)
           Storage::UsedFeaturesDependencyType_SUGGESTED
         end
 
-      StorageFeaturesList.from_bitfield(storage_used_features(type))
+      list = StorageFeaturesList.from_bitfield(storage_used_features(type))
+      list.concat(yast_commit_features)
+      list
     end
 
     # List of required (mandatory) storage features used by the devicegraph
@@ -626,7 +635,20 @@ def optional_used_features
       all = storage_used_features(Storage::UsedFeaturesDependencyType_SUGGESTED)
       required = storage_used_features(Storage::UsedFeaturesDependencyType_REQUIRED)
       # Using binary XOR in those bit fields to calculate the difference
-      StorageFeaturesList.from_bitfield(all ^ required)
+      list = StorageFeaturesList.from_bitfield(all ^ required)
+      list.concat(yast_commit_features)
+      list
+    end
+
+    # List of features that correspond to aspects handled by Y2Storage (not coming
+    # from libstorage-ng) and that need to be present in the target system either during
+    # the storage commit phase or at a later stage. Ie. features needed in the target
+    # system to access the device or to finish its configuration.
+    #
+    # @return [StorageFeaturesList]
+    def yast_commit_features
+      features = encryptions.flat_map(&:commit_features).uniq
+      StorageFeaturesList.new(features)
     end
 
     private

src/lib/y2storage/encryption.rb

@@ -62,6 +62,23 @@ class Encryption < BlkDevice
     storage_forward :key_file
     storage_forward :key_file=
 
+    # @!method use_key_file_in_commit?
+    #   Whether the information at {#key_file} is used in the commit phase of libstorage-ng
+    #   (in case it contains a valid value).
+    #
+    #   The default value is true, but it can be set to false in order to fill the third column
+    #   of the crypttab file without actually affecting the creation of the device.
+    #
+    #   @return [Boolean]
+    storage_forward :use_key_file_in_commit?
+
+    # @!method use_key_file_in_commit=(value)
+    #
+    #   Sets the {#use_key_file_in_commit?} flag
+    #
+    #   @param value [Boolean]
+    storage_forward :use_key_file_in_commit=
+
     # @!attribute cipher
     #   The encryption cipher
     #
@@ -345,6 +362,14 @@ def finish_installation
       encryption_process&.finish_installation
     end
 
+    # Features that must be supported in the target system to finish the encryption
+    # process
+    #
+    # @return [Array<YastFeature>]
+    def commit_features
+      encryption_process&.commit_features || []
+    end
+
     # If the current mount_by is suitable, it does nothing.
     #
     # Otherwise, it assigns the best option from all the suitable ones

src/lib/y2storage/encryption_method.rb

@@ -20,6 +20,7 @@
 require "y2storage/encryption_method/luks1"
 require "y2storage/encryption_method/pervasive_luks2"
 require "y2storage/encryption_method/luks2"
+require "y2storage/encryption_method/tpm_fde"
 require "y2storage/encryption_method/random_swap"
 require "y2storage/encryption_method/protected_swap"
 require "y2storage/encryption_method/secure_swap"
@@ -47,6 +48,8 @@ module EncryptionMethod
     PERVASIVE_LUKS2 = PervasiveLuks2.new
     # Instance of the Luks2 method to be always returned by the module
     LUKS2 = Luks2.new
+    # Instance of the TpmFde method to be always returned by the module
+    TPM_FDE = TpmFde.new
     # Instance of the RandomSwap method to be always returned by the module
     RANDOM_SWAP = RandomSwap.new
     # Instance of the ProtectedSwap method to be always returned by the module
@@ -57,7 +60,7 @@ module EncryptionMethod
     # Sorted list of all the method instances
     # @see .all
     ALL = [
-      LUKS1, PERVASIVE_LUKS2, LUKS2, RANDOM_SWAP, PROTECTED_SWAP, SECURE_SWAP
+      LUKS1, PERVASIVE_LUKS2, LUKS2, TPM_FDE, RANDOM_SWAP, PROTECTED_SWAP, SECURE_SWAP
     ]
     private_constant :ALL
 

src/lib/y2storage/encryption_method/tpm_fde.rb

@@ -0,0 +1,149 @@
+# Copyright (c) [2023] SUSE LLC
+#
+# All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of version 2 of the GNU General Public License as published
+# by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, contact SUSE LLC.
+#
+# To contact SUSE LLC about this file by physical or electronic mail, you may
+# find current contact information at www.suse.com.
+# Copyright (c) [2019] SUSE LLC
+
+require "yast"
+require "y2storage/encryption_method/base"
+require "y2storage/yast_feature"
+require "y2storage/encryption_processes/tpm_fde_tools"
+
+Yast.import "Mode"
+Yast.import "Package"
+
+module Y2Storage
+  module EncryptionMethod
+    # Encryption method that allows to encrypt a device using LUKS2 and configure the unlocking
+    # process via the system TPM using the fde-tools created by SUSE.
+    #
+    # This is a quite special encryption method due to the way the fde-tools work. First of all,
+    # if this method is used, it must be used at least for the root (/) filesystem and only
+    # additionally for some other devices.
+    class TpmFde < Base
+      def initialize
+        textdomain "storage"
+
+        super(:tpm_fde, _("TPM-Based Full Disk Encrytion"))
+      end
+
+      # @see Base#used_for?
+      #
+      # @todo Not sure if this would be possible at the end, since the exact way to setup the
+      # system using fde-tools is still changing too often. In any case, having a precise result
+      # for this method will only be relevant when implementing support for creating encrypted
+      # devices in an installed system. During installation returning always false is perfectly
+      # correct.
+      #
+      # @return [Boolean] false
+      def used_for?(_encryption)
+        # One candidate criteria (still waiting for some conversations with fde-toold developers)
+        # could be:
+        # encryption.type.is?(:luks2) && key_file == EncryptionProcesses::TpmFdeTools.key_file_name
+        false
+      end
+
+      # @see Base#available?
+      #
+      # In this initial implementation this always returns false because there important
+      # limitations to use this in (Auto)YaST:
+      #
+      # - The current version of the inst-sys cannot talk to the TPM
+      # - There is still no corresponding UI in the Expert Partitioner
+      # - Some mechanism to ensure consistency (eg. checking all devices use the same recovery
+      #   password) need to be introduced
+      # - The current implementation of the encryption method only covers system installation
+      #   (with no support to add a new encrypted device to a system already using fde-tools)
+      #
+      # So far, the encryption method is implemented to be used by Agama (which doesn't honor
+      # the {#available?} method.
+      #
+      # @return [Boolean] false
+      def available?
+        false
+      end
+
+      # Whether both the target system and the product being installed meet the requisites
+      # to setup devices using this encryption method.
+      #
+      # The encryption method must be used at least for the root filesystem (eg. is not possible to
+      # use it for /var but not for /), but that can't hardly be controlled here. A separate
+      # validation that considers the whole devicegraph is needed.
+      #
+      # @return [Boolean]
+      def possible?
+        tpm_system? && tpm_product?
+      end
+
+      # Creates an encryption device for the given block device
+      #
+      # @param blk_device [Y2Storage::BlkDevice]
+      # @param dm_name [String]
+      #
+      # @return [Y2Storage::Encryption]
+      def create_device(blk_device, dm_name, label: "")
+        encryption_process.create_device(blk_device, dm_name, label: label)
+      end
+
+      # Special method used in the tests to reset all memoizations
+      def reset
+        @tpm_present = nil
+      end
+
+      private
+
+      # @see Base#encryption_process
+      def encryption_process
+        EncryptionProcesses::TpmFdeTools.new(self)
+      end
+
+      # Whether the system is capable of using the encryption method
+      #
+      # @see #possible?
+      #
+      # @return [Boolean]
+      def tpm_system?
+        Y2Storage::Arch.new.efiboot? && tpm_present?
+      end
+
+      # Whether a TPM2 chip is present and working
+      #
+      # @see #possible?
+      #
+      # @return [Boolean]
+      def tpm_present?
+        return @tpm_present unless @tpm_present.nil?
+
+        @tpm_present = EncryptionProcesses::FdeTools.new.tpm_present?
+      end
+
+      # Whether the product being installed has the ability to configure the encryption method
+      #
+      # @see #possible?
+      #
+      # @return [Boolean]
+      def tpm_product?
+        # TODO: We should likely do some memoization of the result. But it is not clear when
+        # such memoization would be invalidated (eg. new packages available due to some change
+        # in selected product or to new repositories).
+
+        # Beware: apart from true and false, AvailableAll can return nil if things go wrong
+        !!Yast::Package.AvailableAll(YastFeature::ENCRYPTION_TPM_FDE.pkg_list)
+      end
+    end
+  end
+end

src/lib/y2storage/encryption_processes/base.rb

@@ -1,4 +1,4 @@
-# Copyright (c) [2019] SUSE LLC
+# Copyright (c) [2019-2023] SUSE LLC
 #
 # All Rights Reserved.
 #
@@ -18,6 +18,7 @@
 # find current contact information at www.suse.com.
 
 require "yast"
+require "y2storage/yast_feature"
 
 require "abstract_method"
 
@@ -93,6 +94,15 @@ def crypt_options(_blk_device)
         []
       end
 
+      # Features objects to describe the requirements to perform the commit phase
+      # and any subsequent operation (eg., initialization during the first boot) of
+      # the encryption procedure
+      #
+      # @return [Array<YastFeature>]
+      def commit_features
+        []
+      end
+
       private
 
       # Open options with the format expected by the underlying tools (cryptsetup)