7348696296

Committed 28 Dec 2023 02:47PM UTC coverage: 39.237% (-0.4%) from 39.615%

Build # 7348696296

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jreidinger

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rubocop: enable Layout/LineLength - manual fixes

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90.6

/src/modules/Security.rb

# ------------------------------------------------------------------------------
# Copyright (c) 2006-2012 Novell, Inc. 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 Novell, Inc.
#
# To contact Novell about this file by physical or electronic mail, you may find
# current contact information at www.novell.com.
# ------------------------------------------------------------------------------

# File:        modules/Security.ycp
# Package:        Security configuration
# Summary:        Data for the security configuration
# Authors:        Michal Svec <msvec@suse.cz>
#
# $Id$
require "yast"
require "yast2/systemd/service"
require "cfa/sysctl_config"
require "cfa/shadow_config"
require "yaml"
require "security/ctrl_alt_del_config"
require "security/display_manager"
require "y2security/autoinst/lsm_config_reader"
require "y2security/security_policies"
require "y2security/security_policies/unknown_rule"
require "y2security/autoinst_profile"

module Yast
  class SecurityClass < Module # rubocop:disable Metrics/ClassLength
    DEFAULT_ENCRYPT_METHOD = "sha512".freeze
    private_constant :DEFAULT_ENCRYPT_METHOD

    include Yast::Logger
    include ::Security::CtrlAltDelConfig

    SYSCTL_VALUES_TO_BOOLEAN = {
      "yes" => true,
      "no"  => false
    }.freeze
    SYSCTL_VALUES_TO_INTSTRING = {
      "yes" => "1",
      "no"  => "0"
    }.freeze

    SHADOW_ATTRS = [
      "FAIL_DELAY",
      "GID_MAX",
      "GID_MIN",
      "PASS_MAX_DAYS",
      "PASS_MIN_DAYS",
      "PASS_WARN_AGE",
      "UID_MAX",
      "UID_MIN",
      "SYS_UID_MAX",
      "SYS_UID_MIN",
      "SYS_GID_MAX",
      "SYS_GID_MIN",
      "USERADD_CMD",
      "USERDEL_PRECMD",
      "USERDEL_POSTCMD"
    ].freeze

    attr_reader :display_manager

    def main
      import_modules

      textdomain "security"

      init_settings
    end

    def import_modules
      Yast.import "UI"
      Yast.import "FileUtils"
      Yast.import "Package"
      Yast.import "Pkg"
      Yast.import "Pam"
      Yast.import "Progress"
      Yast.import "Service"
      Yast.import "Directory"
      Yast.import "Report"
      Yast.import "PackagesProposal"
      Yast.include self, "security/levels.rb"
    end

    def init_settings
      # Services to check
      srv_file = Directory.find_data_file("security/services.yml")
      srv_lists = if srv_file
        begin
          YAML.load_file(srv_file)
        rescue StandardError => e
          log.warn "Failed to load #{srv_file}. Error: #{e.inspect}"
          {}
        end
      else
        {}
      end

      # These must be running
      @mandatory_services = srv_lists["mandatory_services"] || []
      # It must be an array of arrays (meaning [ [ || ] && && ])
      @mandatory_services.map! { |s| s.is_a?(::String) ? [s] : s }
      # These can be ignored (if they are running it's OK)
      @optional_services = srv_lists["optional_services"] || []
      # All other services should be turned off

      @display_manager = ::Security::DisplayManager.current

      # systemd target, defining ctrl-alt-del behavior
      @ctrl_alt_del_file = ::Security::CtrlAltDelConfig::SYSTEMD_FILE

      # encryption methods supported by pam_unix (bnc#802006)
      @encryption_methods = ["des", "md5", "sha256", "sha512"]

      # All security settings
      @Settings = {
        "CONSOLE_SHUTDOWN"                          => ::Security::CtrlAltDelConfig.default,
        "CRACKLIB_DICT_PATH"                        => "/usr/lib/cracklib_dict",
        "DISPLAYMANAGER_REMOTE_ACCESS"              => "no",
        "kernel.sysrq"                              => "0",
        "net.ipv4.tcp_syncookies"                   => true,
        "net.ipv4.ip_forward"                       => false,
        "net.ipv6.conf.all.forwarding"              => false,
        "FAIL_DELAY"                                => "3",
        "GID_MAX"                                   => "60000",
        "GID_MIN"                                   => "1000",
        "HIBERNATE_SYSTEM"                          => "active_console",
        "PASSWD_ENCRYPTION"                         => "sha512",
        "PASSWD_USE_PWQUALITY"                      => "yes",
        "PASS_MAX_DAYS"                             => "99999",
        "PASS_MIN_DAYS"                             => "0",
        "PASS_MIN_LEN"                              => "5",
        "PASS_WARN_AGE"                             => "7",
        "PERMISSION_SECURITY"                       => "secure",
        "DISABLE_RESTART_ON_UPDATE"                 => "no",
        "DISABLE_STOP_ON_REMOVAL"                   => "no",
        "RUN_UPDATEDB_AS"                           => "nobody",
        "UID_MAX"                                   => "60000",
        "UID_MIN"                                   => "500",
        "SYS_UID_MAX"                               => "499",
        "SYS_UID_MIN"                               => "100",
        "SYS_GID_MAX"                               => "499",
        "SYS_GID_MIN"                               => "100",
        "USERADD_CMD"                               => "/usr/sbin/useradd.local",
        "USERDEL_PRECMD"                            => "/usr/sbin/userdel-pre.local",
        "USERDEL_POSTCMD"                           => "/usr/sbin/userdel-post.local",
        "PASSWD_REMEMBER_HISTORY"                   => "0",
        "SYSLOG_ON_NO_ERROR"                        => "yes",
        "DISPLAYMANAGER_ROOT_LOGIN_REMOTE"          => "no",
        "DISPLAYMANAGER_XSERVER_TCP_PORT_6000_OPEN" => "no",
        "SMTPD_LISTEN_REMOTE"                       => "no",
        "MANDATORY_SERVICES"                        => "yes",
        "EXTRA_SERVICES"                            => "no"
      }

      @Settings.merge!(@display_manager.default_settings) if @display_manager

      # List of missing mandatory services
      @missing_mandatory_services = []
      # List of enabled services not included in mandatory or optional lists
      @extra_services = []

      # the original settings
      @Settings_bak = deep_copy(@Settings)

      # keys that should not be tested against predefined levels:
      # - *_SERVICES have different syntax, are not saved in current form
      @do_not_test = [
        "MANDATORY_SERVICES",
        "EXTRA_SERVICES"
      ]

      # Security settings locations
      @Locations = {
        ".sysconfig.security" => ["PERMISSION_SECURITY"],
        ".sysconfig.services" => [
          "DISABLE_RESTART_ON_UPDATE",
          "DISABLE_STOP_ON_REMOVAL"
        ],
        ".sysconfig.locate"   => ["RUN_UPDATEDB_AS"],
        ".sysconfig.cron"     => ["SYSLOG_ON_NO_ERROR"],
        ".sysconfig.mail"     => ["SMTPD_LISTEN_REMOTE"]
      }

      @Locations.merge!(@display_manager.default_locations) if @display_manager

      # Default values for /etc/sysctl.conf keys
      @sysctl = {
        "kernel.sysrq"                 => "0",
        "net.ipv4.tcp_syncookies"      => true,
        "net.ipv4.ip_forward"          => false,
        "net.ipv6.conf.all.forwarding" => false
      }

      # Mapping of /etc/sysctl.conf keys to old (obsoleted) sysconfig ones
      # (used during autoYaST import)
      @sysctl2sysconfig = {
        "kernel.sysrq"                 => "ENABLE_SYSRQ",
        "net.ipv4.tcp_syncookies"      => "IP_TCP_SYNCOOKIES",
        "net.ipv4.ip_forward"          => "IP_FORWARD",
        "net.ipv6.conf.all.forwarding" => "IPV6_FORWARD"
      }

      # Mapping of /etc/login.defs keys to old (obsoleted) ones
      # (used during autoYaST import)
      @obsolete_login_defs = {
        "SYS_UID_MAX" => "SYSTEM_UID_MAX",
        "SYS_UID_MIN" => "SYSTEM_UID_MIN",
        "SYS_GID_MAX" => "SYSTEM_GID_MAX",
        "SYS_GID_MIN" => "SYSTEM_GID_MIN"
      }

      # mapping of internal YaST values to values needed for
      # org.freedesktop.upower.hibernate privilege
      @ycp2polkit = {
        "active_console" => "auth_admin:auth_admin:yes",
        "auth_admin"     => "auth_admin:auth_admin:auth_admin",
        "anyone"         => "yes:yes:yes"
      }

      # Remaining settings:
      # - PASSWD_ENCRYPTION (/etc/pam?)
      # - MANDATORY_SERVICES
      # - EXTRA_SERVICES

      # Number of sigificant characters in the password
      @PasswordMaxLengths = {
        "des"    => 8,
        "md5"    => 127,
        "sha256" => 127,
        "sha512" => 127
      }

      # Abort function
      # return boolean return true if abort
      @AbortFunction = nil

      # Data was modified?
      @modified = false

      @proposal_valid = false
      @write_only = false

      # Force reading of sysctl configuration
      @sysctl_config = nil

      @activation_mapping = {
        "DHCPD_RUN_CHROOTED"           => "/usr/bin/systemctl try-restart dhcpd.service",
        "DHCPD_RUN_AS"                 => "/usr/bin/systemctl try-restart dhcpd.service",
        # restart sendmail or postfix - whatever is installed
        "SMTPD_LISTEN_REMOTE"          => "/usr/bin/systemctl try-restart sendmail postfix",
        "net.ipv4.tcp_syncookies"      => "/usr/bin/systemctl try-restart network",
        "net.ipv4.ip_forward"          => "/usr/bin/systemctl try-restart network",
        "net.ipv6.conf.all.forwarding" => "/usr/bin/systemctl try-restart network"
      }

      @shadow_config = nil
    end

    # List of missing mandatory services
    def MissingMandatoryServices
      @missing_mandatory_services
    end

    # List of enabled services that are neither mandatory nor optional
    def ExtraServices
      @extra_services
    end

    # Check for pending Abort press
    # @return true if pending abort
    def PollAbort
      UI.PollInput == :abort
    end

    # Abort function
    # @return blah blah lahjk
    def Abort
      return Builtins.eval(@AbortFunction) == true if !@AbortFunction.nil?

      false
    end

    # Function which returns if the settings were modified
    # @return [Boolean]  settings were modified
    def GetModified
      @modified
    end

    # Function sets internal variable, which indicates, that any
    # settings were modified, to "true"
    def SetModified
      @modified = true

      nil
    end

    # Data was modified?
    # @return true if modified
    def Modified
      Builtins.y2debug("modified=%1", @modified)
      @modified
    end

    def ReadServiceSettings
      read_missing_mandatory_services
      setting = MissingMandatoryServices() == [] ? "secure" : "insecure"
      @Settings["MANDATORY_SERVICES"] = setting
      read_extra_services
      setting = ExtraServices() == [] ? "secure" : "insecure"
      @Settings["EXTRA_SERVICES"] = setting

      nil
    end

    # Read the information about ctrl+alt+del behavior
    # See bug 742783 for description
    def ReadConsoleShutdown
      @Settings["CONSOLE_SHUTDOWN"] =
        ::Security::CtrlAltDelConfig.current || ::Security::CtrlAltDelConfig.default
    end

    # Read the settings from the files included in @Locations
    def read_from_locations
      # NOTE: the call to #sort is only needed to satisfy the old testsuite
      @Locations.sort.each do |file, vars|
        vars.each do |var|
          val = ""
          filename = nil
          if file.include?("sysconfig")
            filename = "/etc" + file.tr(".", "/")
            log.info "filename=#{filename}"
          end
          if filename.nil? || SCR.Read(path(".target.size"), filename) > 0
            val = SCR.Read(path("#{file}.#{var}"))
            log.debug "Reading: #{file}.#{var} (#{val})"
          end
          @Settings[var] = val unless val.nil?
        end
      end

      log.debug "Settings (after #{__callee__}): #{@Settings}"
    end

    # Reads login.defs configuration
    def read_shadow_config
      SHADOW_ATTRS.each do |attr|
        value = shadow_config.public_send(attr.downcase)
        next if value.nil?

        @Settings[attr] = shadow_config.public_send(attr.downcase)
      end
      log.debug "Settings (after #{__callee__}): #{@Settings}"
    end

    # Read the settings from sysctl.conf
    def read_kernel_settings
      # NOTE: the call to #sort is only needed to satisfy the old testsuite
      @sysctl.sort.each do |key, default_value|
        val = read_sysctl_value(key)
        val = default_value if val.nil? || val == ""
        @Settings[key] = val
      end

      log.debug "Settings (after #{__callee__}): #{@Settings}"
    end

    # Reads the Linux Security Module configuration
    def read_lsm_config
      lsm_config.read
    end

    def read_encryption_method
      method = shadow_config.encrypt_method.to_s.downcase

      method = "sha512" if !@encryption_methods.include?(method)

      @Settings["PASSWD_ENCRYPTION"] = method
    end

    def read_pam_settings
      read_encryption_method

      # pwquality and pwhistory settings (default values)
      @Settings["PASS_MIN_LEN"] = "5"
      @Settings["PASSWD_REMEMBER_HISTORY"] = "0"
      @Settings["CRACKLIB_DICT_PATH"] = "/usr/lib/cracklib_dict"

      pam_pwquality = Pam.Query(pwquality_module) || {}
      @Settings["PASSWD_USE_PWQUALITY"] = pam_pwquality.empty? ? "no" : "yes"

      pam_pwquality.fetch("password", []).each do |entry|
        key, value = entry.split("=")
        if value
          @Settings["CRACKLIB_DICT_PATH"] = value if key == "dictpath"
          @Settings["PASS_MIN_LEN"]       = value if key == "minlen"
        end
      end

      pam_history = Pam.Query("pwhistory") || {}
      pam_history.fetch("password", []).each do |entry|
        key, value = entry.split("=")
        @Settings["PASSWD_REMEMBER_HISTORY"] = value if key == "remember" && value
      end
      log.debug "Settings (after #{__callee__}): #{@Settings}"
    end

    def read_permissions
      # Removing "local" from the string
      permissions = @Settings["PERMISSION_SECURITY"].to_s.split
      @Settings["PERMISSION_SECURITY"] = permissions.delete_if do |p|
        p == "local"
      end.join(" ")

      # default value
      @Settings["PERMISSION_SECURITY"] = "secure" if @Settings["PERMISSION_SECURITY"].empty?

      log.debug "PERMISSION_SECURITY (after #{__callee__}): " \
                "#{@Settings["PERMISSION_SECURITY"]}"

      @Settings["PERMISSION_SECURITY"]
    end

    def read_polkit_settings
      action = "org.freedesktop.upower.hibernate"

      hibernate = SCR.Read(Builtins.add(path(".etc.polkit-default-privs_local"), action)).to_s

      @Settings["HIBERNATE_SYSTEM"] = case hibernate
      when "auth_admin:auth_admin:auth_admin"
        "auth_admin"
      when "yes:yes:yes"
        "anyone"
      else
        "active_console"
      end
      log.debug "HIBERNATE_SYSTEM (after #{__callee__}): " \
                "#{@Settings["HIBERNATE_SYSTEM"]}"
    end

    # The name of the PAM module to deal with password quality. Either
    # "pwquality" or "cracklib". See bug #1171318 why this is needed.
    def pwquality_module
      return @mod_name if @mod_name

      # Both pwquality and cracklib can be installed. in that case
      # cracklib seems to be a non-functional deprecated module. So
      # prefer pwquality.
      @mod_name = Pam.List.include?("pwquality") ? "pwquality" : "cracklib"
    end

    # Read all security settings
    #
    # @raise [Exception] if there is an issue while reading the settings
    # @return [Boolean] true on success
    def Read
      @Settings = {}
      @modified = false

      # Read security settings
      read_from_locations
      read_shadow_config

      ReadConsoleShutdown()

      log.debug "Settings (after read console shutdown): #{@Settings}"

      # Read runlevel setting
      ReadServiceSettings()

      read_pam_settings

      # Local permissions hack
      read_permissions

      read_polkit_settings

      read_kernel_settings

      read_lsm_config

      # remember the read values
      @Settings_bak = deep_copy(@Settings)

      log.info "Settings after Read: #{@Settings}"
      true
    end

    # Reads all security settings without raising exceptions
    #
    # This method saves any error produced while reading the settings instead of raising an
    # exception. This is needed when the module is used from a perl module because the exceptions
    # are not propagated to perl code.
    #
    # @return [Boolean] true on success. When false, the error message can be check by calling to
    #   Security#read_error.
    def SafeRead
      @read_error = nil
      self.Read
      true
    rescue StandardError => e
      @read_error = e.message
      false
    end

    # Write the value of ctrl-alt-delete behavior
    def write_console_shutdown(ca)
      case ca
      when "reboot"
        SCR.Execute(path(".target.remove"), @ctrl_alt_del_file)
      when "halt"
        SCR.Execute(
          path(".target.bash"),
          Builtins.sformat(
            "ln -s -f /usr/lib/systemd/system/poweroff.target %1",
            @ctrl_alt_del_file
          )
        )
      else
        SCR.Execute(
          path(".target.bash"),
          Builtins.sformat("ln -s -f /dev/null %1", @ctrl_alt_del_file)
        )
      end
      true
    end

    # Write the settings from @Locations to the corresponding files
    def write_to_locations
      commitlist = []
      # NOTE: the call to #sort is only needed to satisfy the old testsuite
      @Locations.sort.each do |file, vars|
        vars.each do |var|
          val = @Settings[var]
          if val && val != SCR.Read(path("#{file}.#{var}"))
            SCR.Write(path("#{file}.#{var}"), val)
            commitlist << file unless commitlist.include?(file)
          end
        end
      end
      commitlist.each do |file|
        SCR.Write(path(file), nil)
      end
    end

    # Write login.defs configuration
    def write_shadow_config
      SHADOW_ATTRS.each do |attr|
        # bsc#1208492 shadow config uses login.defs attr formatting
        # like <Key><space>*<Value>, so empty value is not supported
        # and moreover can cause crash in login.defs lens
        next if @Settings[attr].nil? || @Settings[attr].empty?

        shadow_config.public_send("#{attr.to_s.downcase}=", @Settings[attr])
      end
      encr = @Settings.fetch("PASSWD_ENCRYPTION", default_encrypt_method)
      shadow_config.encrypt_method = encr if encr != @Settings_bak["PASSWD_ENCRYPTION"]
      shadow_config.save
    end

    # Writes the current Linux Security Module Configuration
    #
    # @see Y2Security:.LSM::Config#save
    # @return [Boolean] whether the configuration was saved or not
    def write_lsm_config
      lsm_config.save
    end

    # Write settings related to PAM behavior
    def write_pam_settings
      # use pwquality?
      if @Settings["PASSWD_USE_PWQUALITY"] == "yes"
        Pam.Add(pwquality_module)
        pth = @Settings["CRACKLIB_DICT_PATH"]
        Pam.Add(pwquality_module + "-dictpath=#{pth}") if pth && pth != "/usr/lib/cracklib_dict"
      else
        Pam.Remove(pwquality_module)
      end

      # save min pass length
      min_len = @Settings["PASS_MIN_LEN"]
      if min_len && min_len != "5" && @Settings["PASSWD_USE_PWQUALITY"] == "yes"
        Pam.Add(pwquality_module) # minlen is part of pwquality
        Pam.Add(pwquality_module + "-minlen=#{min_len}")
      else
        Pam.Remove(pwquality_module + "-minlen")
      end

      # save "remember" value (number of old user passwords to not allow)
      remember_history = @Settings["PASSWD_REMEMBER_HISTORY"]
      if remember_history && remember_history != "0"
        Pam.Add("pwhistory")
        Pam.Add("pwhistory-remember=#{remember_history}")
      else
        Pam.Remove("pwhistory-remember")
      end
    end

    # Write settings related to sysctl.conf and sysrq
    def write_kernel_settings
      # write sysctl.conf
      written = false
      # NOTE: the call to #sort is only needed to satisfy the old testsuite
      @sysctl.sort.each do |key, default_value|
        val = @Settings.fetch(key, default_value)
        int_val = begin
          Integer(val)
        rescue StandardError
          nil
        end
        if int_val.nil? && ![TrueClass, FalseClass].include?(val.class)
          log.error "value #{val} for #{key} has wrong type, not writing"
        elsif val != read_sysctl_value(key)
          write_sysctl_value(key, val)
          written = true
        end
      end

      # In case of modified, always write the changes (bsc#1167234)
      sysctl_config.save if written
      written
    end

    # Write local PolicyKit configuration
    def write_polkit_settings
      if @Settings.fetch("HIBERNATE_SYSTEM", "") !=
          @Settings_bak.fetch("HIBERNATE_SYSTEM", "")
        # allow writing any value (different from predefined ones)
        ycp_value = @Settings.fetch("HIBERNATE_SYSTEM", "active_console")
        hibernate = @ycp2polkit.fetch(ycp_value, ycp_value)
        action = "org.freedesktop.upower.hibernate"
        SCR.Write(
          path(".etc.polkit-default-privs_local") + action,
          hibernate
        )
      end
    end

    # Apply sysctl settings from all the sysctl configuration files
    def apply_sysctl_changes
      # Reports if there are conflict when the configuration is applied
      sysctl_config.conflict?

      Yast::Execute.on_target("/usr/sbin/sysctl", "--system")
    end

    # Ensures that sysctl changes, file permissions and PolicyKit privileges
    # are applied
    #
    # @param sysctl [Boolean] whether sysctl changes should be applied or not
    def apply_new_settings(sysctl: false)
      # Apply sysctl changes to the running system (bsc#1167234)
      apply_sysctl_changes if sysctl
      # apply all current permissions as they are now
      # (what SuSEconfig --module permissions would have done)
      SCR.Execute(path(".target.bash"), "/usr/bin/chkstat --system")

      # ensure polkit privileges are applied (bnc #541393)
      polkit_exec = "/sbin/set_polkit_default_privs"
      SCR.Execute(path(".target.bash"), polkit_exec) if FileUtils.Exists(polkit_exec)
    end

    # Executes the corresponding activation command for the settings that have
    # an entry in @activation_mapping and have changed
    def activate_changes
      # NOTE: the call to #sort is only needed to satisfy the old testsuite
      @activation_mapping.sort.each do |setting, action|
        next if @Settings[setting] == @Settings_bak[setting]

        log.info(
          "Option #{setting} has been modified, "\
          "activating the change: #{action}"
        )
        res = SCR.Execute(path(".target.bash"), action)
        log.error "Activation failed" if res != 0
      end
    end

    # Write all security settings
    # @return true on success
    def Write
      return true if !@modified

      log.info "Writing configuration"

      # Security read dialog caption
      caption = _("Saving Security Configuration")
      steps = 5

      Progress.New(
        caption,
        " ",
        steps,
        [
          # Progress stage 1/5
          _("Write security settings"),
          # Progress stage 2/5
          _("Write shutdown settings"),
          # Progress stage 3/5
          _("Write PAM settings"),
          # Progress stage 4/5
          _("Update system settings"),
          # Progress stage 5/5
          _("Write SELinux settings")
        ],
        [
          # Progress step 1/6
          _("Writing security settings..."),
          # Progress step 2/6
          _("Writing shutdown settings..."),
          # Progress step 3/6
          _("Writing PAM settings..."),
          # Progress step 4/6
          _("Updating system settings..."),
          # Progress step 5/6
          _("Writing  settings..."),
          # Progress step 6/6
          _("Finished")
        ],
        ""
      )

      log.debug "Settings=#{@Settings}"

      # Write security settings
      return false if Abort()

      Progress.NextStage
      if !@Settings["PERMISSION_SECURITY"].include?("local")
        @Settings["PERMISSION_SECURITY"] << " local"
      end
      write_to_locations
      write_shadow_config

      # Write shutdown settings
      return false if Abort()

      Progress.NextStage
      write_console_shutdown(@Settings.fetch("CONSOLE_SHUTDOWN", "ignore"))

      # Write authentication and privileges settings
      return false if Abort()

      Progress.NextStage
      write_pam_settings
      write_polkit_settings
      sysctl_modified = write_kernel_settings

      # Finish him
      return false if Abort()

      Progress.NextStage
      apply_new_settings(sysctl: sysctl_modified)

      return false if Abort()

      Progress.NextStage
      activate_changes

      return false if Abort()

      Progress.NextStage
      write_lsm_config

      return false if Abort()

      @modified = false
      true
    end

    # Get all security settings from the first parameter
    # (For use by autoinstallation.)
    # @param [Hash] settings The YCP structure to be imported.
    # @return [Boolean] True on success
    def Import(settings)
      settings = deep_copy(settings)
      settings["kernel.sysrq"] = settings.delete("KERNEL.SYSRQ") if settings.key?("KERNEL.SYSRQ")
      if settings.key?("NET.IPV4.TCP_SYNCOOKIES")
        settings["net.ipv4.tcp_syncookies"] = settings.delete("NET.IPV4.TCP_SYNCOOKIES")
      end
      if settings.key?("NET.IPV4.IP_FORWARD")
        settings["net.ipv4.ip_forward"] = settings.delete("NET.IPV4.IP_FORWARD")
      end
      if settings.key?("NET.IPV6.CONF.ALL.FORWARDING")
        settings["net.ipv6.conf.all.forwarding"] = settings.delete("NET.IPV6.CONF.ALL.FORWARDING")
      end

      # conversion to true/false
      ["net.ipv4.tcp_syncookies", "net.ipv4.ip_forward",
       "net.ipv6.conf.all.forwarding"].each do |key|
        settings[key] = settings[key] == "1" if settings.key?(key) && settings[key].is_a?(::String)
      end

      if settings.key?("PASSWD_USE_CRACKLIB")
        settings["PASSWD_USE_PWQUALITY"] = settings.delete("PASSWD_USE_CRACKLIB")
      end

      settings["lsm_select"] = settings.delete("LSM_SELECT") if settings.key?("LSM_SELECT")
      settings["selinux_mode"] = settings.delete("SELINUX_MODE") if settings.key?("SELINUX_MODE")
      if settings.key?("SECURITY_POLICY")
        settings["security_policy"] = settings.delete("SECURITY_POLICY")
      end

      section = Y2Security::AutoinstProfile::SecuritySection.new_from_hashes(settings)
      import_lsm_config(section)
      import_security_policy(section.security_policy)

      return true if settings == {}

      @modified = true
      tmpSettings = {}
      @Settings.each do |k, v|
        if settings.key?(k)
          tmpSettings[k] = settings[k]
        elsif @sysctl.key?(k) && settings.key?(@sysctl2sysconfig[k])
          val = settings[@sysctl2sysconfig[k]].to_s
          tmpSettings[k] = if @sysctl[k].is_a?(TrueClass) || @sysctl[k].is_a?(FalseClass)
            SYSCTL_VALUES_TO_BOOLEAN.key?(val) ? SYSCTL_VALUES_TO_BOOLEAN[val] : val
          else
            SYSCTL_VALUES_TO_INTSTRING.key?(val) ? SYSCTL_VALUES_TO_INTSTRING[val] : val
          end
        # using the old sysconfig AY format
        else
          # using old login defs settings ?
          tmpSettings[k] = settings[@obsolete_login_defs[k]] || v
        end
      end

      @Settings = tmpSettings
      true
    end

    # Dump the security settings to a single map
    # (For use by autoinstallation.)
    # @return [Hash] Dumped settings (later acceptable by Import ())
    def Export
      settings = deep_copy(@Settings)
      # conversion to 0/1 string
      ["net.ipv4.tcp_syncookies", "net.ipv4.ip_forward",
       "net.ipv6.conf.all.forwarding"].each do |key|
        if [TrueClass, FalseClass].include?(settings[key].class)
          settings[key] = settings[key] ? "1" : "0"
        end
      end

      if pwquality_module == "cracklib"
        settings["PASSWD_USE_CRACKLIB"] = settings.delete("PASSWD_USE_PWQUALITY")
      end

      merged_settings = settings.merge(lsm_config.export)
      security_policy = export_security_policy
      merged_settings.merge!("security_policy" => security_policy) unless security_policy.empty?
      merged_settings
    end

    # Create a textual summary and a list of unconfigured cards
    # @return summary of the current configuration
    def Summary
      settings = deep_copy(@Settings)
      Builtins.foreach(@do_not_test) do |key|
        settings = Builtins.remove(settings, key)
      end

      # Determine current settings
      current = :custom
      Builtins.maplist(@Levels) do |key, level|
        Builtins.y2debug("%1=%2", key, level)
        current = key if level == settings
      end
      Builtins.y2debug("%1=%2", current, @Settings)

      # Summary text
      summary = _("Current Security Level: Custom settings")
      if current != :custom
        # Summary text
        summary = Builtins.sformat(
          _("Current Security Level: %1"),
          Ops.get(@LevelsNames, Convert.to_string(current), "")
        )
      end

      [summary, []]
    end

    # Create an overview table with all configured cards
    # @return table items
    def Overview
      []
    end

    # Expose the default encryption method to other parts of the module
    #
    # @return [String]
    def default_encrypt_method
      DEFAULT_ENCRYPT_METHOD
    end

    # Convenience method to obtain a Linux Security Module Config instance
    #
    # @return [Y2Security::LSM::Config]
    def lsm_config
      Y2Security::LSM::Config.instance
    end

    publish variable: :mandatory_services, type: "const list <list <string>>"
    publish variable: :optional_services, type: "const list <string>"
    publish function: :MissingMandatoryServices, type: "list <list <string>> ()"
    publish function: :ExtraServices, type: "list <string> ()"
    publish variable: :Settings, type: "map <string, string>"
    publish variable: :do_not_test, type: "list <string>"
    publish variable: :PasswordMaxLengths, type: "map"
    publish variable: :AbortFunction, type: "block <boolean>"
    publish function: :PollAbort, type: "boolean ()"
    publish function: :Abort, type: "boolean ()"
    publish variable: :modified, type: "boolean"
    publish variable: :proposal_valid, type: "boolean"
    publish variable: :write_only, type: "boolean"
    publish variable: :read_error, type: "string"
    publish function: :GetModified, type: "boolean ()"
    publish function: :SetModified, type: "void ()"
    publish function: :Modified, type: "boolean ()"
    publish function: :ReadServiceSettings, type: "void ()"
    publish function: :Read, type: "boolean ()"
    publish function: :SafeRead, type: "boolean ()"
    publish function: :Write, type: "boolean ()"
    publish function: :Import, type: "boolean (map)"
    publish function: :Export, type: "map ()"
    publish function: :Summary, type: "list ()"
    publish function: :Overview, type: "list ()"

  protected

    # It sets the LSM configuration according to the one provided in the profile and ensures
    # needed patterns for the selected LSM
    #
    # @param section [SecuritySection] profile security settings to be imported.
    def import_lsm_config(section)
      Y2Security::Autoinst::LSMConfigReader.new(section).read
      return unless lsm_config.configurable?

      PackagesProposal.SetResolvables("LSM", :pattern, lsm_config.needed_patterns)
    end

    # It enables the security policy according to the profile
    #
    # @param section [Y2Security::AutoinstProfile::SecurityPolicySection] security
    #   policy section from the AutoYaST profile
    def import_security_policy(section)
      return if section.policy.nil?

      manager = Y2Security::SecurityPolicies::Manager.instance
      policy = manager.find_policy(section.policy.to_sym)
      if policy.nil?
        log.error "The security policy '#{section.policy}' is unknown."
        return
      end
      manager.enabled_policy = policy
      manager.scap_action = section.action.to_sym if section.action
    rescue Y2Security::SecurityPolicies::Manager::UnknownSCAPAction
      log.error("SCAP action '#{section.action}' is not valid.")
    end

    # Export security policy settings
    #
    # @return [Hash]
    def export_security_policy
      Y2Security::AutoinstProfile::SecurityPolicySection.new_from_system
        .to_hashes
    end

    # Sets @missing_mandatory_services honoring the systemd aliases
    def read_missing_mandatory_services
      log.info("Checking mandatory services")

      @missing_mandatory_services = @mandatory_services.reject do |services|
        enabled = services.any? { |service| Service.enabled?(service) }
        log.info("Mandatory services #{services} are enabled: #{enabled}")
        enabled
      end

      log.info("Missing mandatory services: #{@missing_mandatory_services}")
    end

    # Sets @extra_services honoring the systemd aliases
    def read_extra_services
      log.info("Searching for extra services")

      enabled_services = Yast2::Systemd::Service.all(names: "Names").select(&:enabled?)
      # Remove from the list the services that are allowed
      @extra_services = enabled_services.reject do |service|
        allowed = allowed_service?(service.name)
        # If the name is not allowed, try the aliases
        if !allowed
          names = alias_names(service)
          allowed = names&.any? { |name| allowed_service?(name) }
        end
        log.info("Found extra service: #{service.name}") unless allowed
        allowed
      end
      @extra_services.map!(&:name)
      log.info("All extra services: #{@extra_services}")
    end

    # Returns the sysctl configuration
    #
    # @note It memoizes the value until {#main} is called.
    #
    # @return [Yast2::CFA::SysctlConfig]
    def sysctl_config
      return @sysctl_config if @sysctl_config

      @sysctl_config = CFA::SysctlConfig.new
      @sysctl_config.load
      @sysctl_config
    end

    # Map sysctl keys to method names from the CFA::SysctlConfig class.
    SYSCTL_KEY_TO_METH = {
      "kernel.sysrq"                 => :kernel_sysrq,
      "net.ipv4.tcp_syncookies"      => :tcp_syncookies,
      "net.ipv4.ip_forward"          => :forward_ipv4,
      "net.ipv6.conf.all.forwarding" => :forward_ipv6
    }.freeze

    # @param key [String] Key to get the value for
    def read_sysctl_value(key)
      sysctl_config.public_send(SYSCTL_KEY_TO_METH[key])
    end

    # @param key    [String] Key to set the value for
    # @param value [String] Value to assign to the given key
    def write_sysctl_value(key, value)
      sysctl_config.public_send(SYSCTL_KEY_TO_METH[key].to_s + "=", value)
    end

    def shadow_config
      @shadow_config ||= CFA::ShadowConfig.load
    end
  end

  # Checks if the service is allowed (i.e. not considered 'extra')
  #
  # @return [Boolean] true whether the service is expected (mandatory or optional)
  def allowed_service?(name)
    all_mandatory_services.include?(name) || @optional_services.include?(name)
  end

  # Flat list of mandatory services
  def all_mandatory_services
    @all_mandatory_services ||= @mandatory_services.flatten
  end

  # List of aliases of the service
  #
  # @return [Array<String>] alias names excluding '.service'
  def alias_names(service)
    names = service.properties.names
    names&.split&.map { |name| name.sub(/\.service$/, "") }
  end

  Security = SecurityClass.new
  Security.main
end

yast / yast-security / 7348696296

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