sudoers command now creates a safe wrapper script.
Sudoers now creates a safe wrapper script that performs sanity checks on sudo : * wrapper generated in /usr/local/bin (name includes version to allow multiple wrappers on the same system) * sudoers command now generates a one-line file in /etc/sudoers.d * SudoWrapper use the new wrapper * Removed unused Config#validate method
This commit is contained in:
Jef Mathiot
Eric Hartmann
parent
47cf361b98
commit
94e175dc07
5 changed files with 169 additions and 78 deletions
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@ -6,5 +6,9 @@ module Vagrant
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def self.source_root
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@source_root ||= Pathname.new(File.dirname(__FILE__)).join('..').expand_path
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end
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def self.sudo_wrapper_path
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"/usr/local/bin/vagrant-lxc-wrapper-#{VERSION}"
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end
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end
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end
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@ -4,6 +4,12 @@ module Vagrant
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module LXC
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module Command
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class Sudoers < Vagrant.plugin("2", :command)
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def initialize(argv, env)
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super
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@env = env
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end
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def execute
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options = { user: ENV['USER'] }
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@ -18,68 +24,168 @@ module Vagrant
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argv = parse_options(opts)
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return unless argv
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filename = "vagrant-lxc-#{options[:user]}"
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to_sudoers!(create_tempfile!(options[:user], filename), filename)
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wrapper_path = Vagrant::LXC.sudo_wrapper_path
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wrapper = create_wrapper!
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sudoers = create_sudoers!(options[:user], wrapper_path)
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su_copy([
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{source: wrapper, target: wrapper_path, mode: "0555"},
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{source: sudoers, target: sudoers_path, mode: "0440"}
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])
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end
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def sudoers_path
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"/etc/sudoers.d/vagrant-lxc-#{Vagrant::LXC::VERSION.gsub( /\./, '-')}"
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end
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private
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# REFACTOR: Make use ERB rendering after https://github.com/mitchellh/vagrant/issues/3231
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# lands into core
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def create_wrapper!
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wrapper = Tempfile.new('lxc-wrapper').tap do |file|
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file.puts "#!/usr/bin/env ruby"
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file.puts "# Automatically created by vagrant-lxc"
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file.puts <<-EOF
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class Whitelist
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class << self
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def add(command, *args)
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list[command] << args
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end
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def list
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@list ||= Hash.new do |key, hsh|
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key[hsh] = []
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end
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end
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def allowed(command)
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list[command] || []
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end
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def run!(argv)
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begin
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command, args = `which \#{argv.shift}`.chomp, argv || []
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check!(command, args)
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puts `\#{command} \#{args.join(" ")}`
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exit $?.to_i
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rescue => e
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STDERR.puts e.message
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exit 1
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end
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end
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private
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def check!(command, args)
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allowed(command).each do |checks|
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return if valid_args?(args, checks)
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end
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raise_invalid(command, args)
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end
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def valid_args?(args, checks)
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return false unless valid_length?(args, checks)
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check = nil
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args.each_with_index do |provided, i|
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check = checks[i] unless check == '**'
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return false unless match?(provided, check)
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end
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true
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end
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def valid_length?(args, checks)
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args.length == checks.length || checks.last == '**'
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end
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def match?(arg, check)
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check == '**' || check.is_a?(Regexp) && !!check.match(arg) || arg == check
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end
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def raise_invalid(command, args)
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raise "Invalid arguments for command \#{command}, " <<
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"provided args: \#{args.inspect}"
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end
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end
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end
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base = "/var/lib/lxc"
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base_path = %r{\\A\#{base}/.*\\z}
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templates_path = %r{\\A/usr/(share|lib|lib64|local/lib)/lxc/templates/.*\\z}
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boxes_path = %r{\\A#{Regexp.escape(@env.boxes_path.to_s)}/.*\\z}
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gems_path = %r{\\A#{Regexp.escape(@env.gems_path.to_s)}/.*\\z}
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template_src = %r{\\A#{Vagrant::LXC.source_root.join('scripts/lxc-template').to_s}\\z}
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##
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# Commands from provider.rb
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# - Check lxc is installed
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Whitelist.add '/usr/bin/which', /\\Alxc-\\w+\\z/
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##
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# Commands from driver.rb
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# - Container config file
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Whitelist.add '/bin/cat', base_path
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# - Shared folders
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Whitelist.add '/bin/mkdir', '-p', base_path
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# - Container config customizations and pruning
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Whitelist.add '/bin/su', 'root', '-c', %r{\\A"sed -e '.*' -ibak \#{base}/.*/config"\\z}
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Whitelist.add '/bin/su', 'root', '-c', %r{\\A"echo '.*' >> \#{base}/.*/config"\\z}
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# - Template import
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Whitelist.add '/bin/cp', boxes_path, templates_path
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Whitelist.add '/bin/cp', gems_path, templates_path
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Whitelist.add '/bin/cp', template_src, templates_path
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Whitelist.add '/bin/chmod', '+x', templates_path
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# - Template removal
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Whitelist.add '/bin/rm', templates_path
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# - Packaging
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Whitelist.add '/bin/su', 'root', '-c', %r{\\A"cd \#{base}/.* && rm -f rootfs\.tar\.gz && tar --numeric-owner -czf /tmp/.*/rootfs\.tar\.gz -C \#{base}/.*/rootfs '\./\.'"\\z}
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Whitelist.add '/bin/chown', /\\A\\d+:\\d+\\z/, %r{\\A/tmp/.*/rootfs\.tar\.gz\\z}
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##
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# Commands from driver/cli.rb
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Whitelist.add '/usr/bin/lxc-version'
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Whitelist.add '/usr/bin/lxc-ls'
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Whitelist.add '/usr/bin/lxc-info', '--name', /.*/
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Whitelist.add '/usr/bin/lxc-create', '--template', /.*/, '--name', /.*/, '**'
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Whitelist.add '/usr/bin/lxc-destroy', '--name', /.*/
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Whitelist.add '/usr/bin/lxc-start', '-d', '--name', /.*/, '**'
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Whitelist.add '/usr/bin/lxc-stop', '--name', /.*/
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Whitelist.add '/usr/bin/lxc-shutdown', '--name', /.*/
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Whitelist.add '/usr/bin/lxc-attach', '--name', /.*/, '**'
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Whitelist.add '/usr/bin/lxc-attach', '-h'
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##
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# Commands from driver/action/remove_temporary_files.rb
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Whitelist.add '/bin/rm', '-rf', %r{\\A\#{base}/.*/rootfs/tmp/.*}
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# Watch out for stones
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Whitelist.run!(ARGV)
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EOF
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end
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wrapper.close
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wrapper.path
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end
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# REFACTOR: Make use ERB rendering after https://github.com/mitchellh/vagrant/issues/3231
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# lands into core
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def create_tempfile!(user, filename)
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sudoers = Tempfile.new(filename).tap do |file|
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file.write "# Automatically created by vagrant-lxc\n"
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commands.each do |command|
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file.write sudoers_policy(user, command[:cmd], command[:args])
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end
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def create_sudoers!(user, command)
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sudoers = Tempfile.new('vagrant-lxc-sudoers').tap do |file|
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file.puts "# Automatically created by vagrant-lxc"
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file.puts "Cmnd_Alias LXC = #{command}"
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file.puts "#{user} ALL=(root) NOPASSWD: LXC"
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end
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sudoers.close
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File.chmod(0644, sudoers.path)
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sudoers.path
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end
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def to_sudoers!(source, destination)
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destination = "/etc/sudoers.d/#{destination}"
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commands = [
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"rm -f #{destination}",
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"cp #{source} #{destination}",
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"chmod 440 #{destination}"
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]
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`echo "#{commands.join('; ')}" | sudo sh`
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end
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def sudoers_policy(user, command, args)
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vagrant_home = "#{`echo ~#{user}`.chomp}/.vagrant.d"
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args = args.gsub /%\{VAGRANT_D\}/, vagrant_home
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args = args.gsub /%\{BOXES\}/, "#{vagrant_home}/boxes"
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"#{user} ALL=(root) NOPASSWD: #{command} #{args}\n"
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end
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def commands
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[
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{ cmd: '/usr/bin/lxc-ls', args: '' },
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{ cmd: '/usr/bin/lxc-info', args: '' },
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{ cmd: '/usr/bin/lxc-attach', args: '' },
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{ cmd: '/usr/bin/which', args: 'lxc-*' },
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{ cmd: '/bin/cat', args: '/var/lib/lxc/*' },
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{ cmd: '/bin/mkdir', args: '-p /var/lib/lxc/*' },
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{ cmd: '/bin/su', args: "root -c sed -e '*' -ibak /var/lib/lxc/*" },
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{ cmd: '/bin/su', args: "root -c echo '*' >> /var/lib/lxc/*" },
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{ cmd: '/usr/bin/lxc-start', args: '-d --name *' },
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{ cmd: '/bin/cp', args: '%{BOXES}/*/lxc/lxc-template /usr/lib/lxc/templates/*' },
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{ cmd: '/bin/cp', args: '%{VAGRANT_D}/gems/gems/vagrant-lxc-*/scripts/lxc-template /usr/lib/lxc/templates/*' },
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{ cmd: '/bin/cp', args: '%{BOXES}/*/lxc/lxc-template /usr/share/lxc/templates/*' },
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{ cmd: '/bin/cp', args: '%{VAGRANT_D}/gems/gems/vagrant-lxc-*/scripts/lxc-template /usr/share/lxc/templates/*' },
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{ cmd: '/bin/rm', args: '/usr/lib/lxc/templates/*' },
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{ cmd: '/bin/rm', args: '/usr/share/lxc/templates/*' },
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{ cmd: '/bin/chmod', args: '+x /usr/lib/lxc/*' },
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{ cmd: '/bin/chmod', args: '+x /usr/share/lxc/*' },
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{ cmd: '/usr/bin/lxc-create', args: '--template * --name * -- --tarball %{BOXES}/*' },
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{ cmd: '/bin/rm', args: '-rf /var/lib/lxc/*/rootfs/tmp/*' },
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{ cmd: '/usr/bin/lxc-shutdown', args: '--name *' },
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{ cmd: '/usr/bin/lxc-stop', args: '--name *' },
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{ cmd: '/usr/bin/lxc-destroy', args: '--name *' }
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]
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def su_copy(files)
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commands = files.map { |file|
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[
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"rm -f #{file[:target]}",
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"cp #{file[:source]} #{file[:target]}",
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"chown root:root #{file[:target]}",
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"chmod #{file[:mode]} #{file[:target]}"
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]
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}.flatten
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system "echo \"#{commands.join("; ")}\" | sudo sh"
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end
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end
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end
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@ -6,12 +6,6 @@ module Vagrant
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# @return [Array]
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attr_reader :customizations
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# A String that points to a file that acts as a wrapper for sudo commands.
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#
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# This allows us to have a single entry when whitelisting NOPASSWD commands
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# on /etc/sudoers
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attr_accessor :sudo_wrapper
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# A string to explicitly set the container name. To use the vagrant
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# machine name, set this to :machine
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attr_accessor :container_name
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@ -41,21 +35,6 @@ module Vagrant
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@sudo_wrapper = nil if @sudo_wrapper == UNSET_VALUE
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@container_name = nil if @container_name == UNSET_VALUE
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end
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def validate(machine)
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errors = []
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if @sudo_wrapper
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hostpath = Pathname.new(@sudo_wrapper).expand_path(machine.env.root_path)
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if ! hostpath.file?
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errors << I18n.t('vagrant_lxc.sudo_wrapper_not_found', path: hostpath.to_s)
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elsif ! hostpath.executable?
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errors << I18n.t('vagrant_lxc.sudo_wrapper_not_executable', path: hostpath.to_s)
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end
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end
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{ "lxc provider" => errors }
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end
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end
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end
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end
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@ -19,8 +19,9 @@ module Vagrant
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def sudo_wrapper
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@shell ||= begin
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wrapper = @machine.provider_config.sudo_wrapper
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wrapper = Pathname(wrapper).expand_path(@machine.env.root_path).to_s if wrapper
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wrapper = Pathname.new(LXC.sudo_wrapper_path).exist? &&
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LXC.sudo_wrapper_path || nil
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@logger.debug("Found sudo wrapper : #{wrapper}") if wrapper
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SudoWrapper.new(wrapper)
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end
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end
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@ -10,13 +10,14 @@ module Vagrant
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end
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def run(*command)
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command.unshift @wrapper_path if @wrapper_path
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options = command.last.is_a?(Hash) ? command.last : {}
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command.unshift @wrapper_path if @wrapper_path && !options[:no_wrapper]
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execute *(['sudo'] + command)
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end
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def su_c(command)
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su_command = if @wrapper_path
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"#{@wrapper_path} \"#{command}\""
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def su_c(command, options={})
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su_command = if @wrapper_path && !options[:no_wrapper]
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"#{@wrapper_path} su root -c \"\\\"#{command}\\\"\""
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else
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"su root -c \"#{command}\""
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end
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