vagrant-lxc-ng/lib/vagrant-lxc/command/sudoers.rb

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require 'tempfile'
module Vagrant
module LXC
module Command
class Sudoers < Vagrant.plugin("2", :command)
def initialize(argv, env)
super
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@argv
@env = env
end
def execute
options = { user: ENV['USER'] }
opts = OptionParser.new do |opts|
opts.banner = "Usage: vagrant lxc sudoers"
opts.separator ""
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opts.on('-u user', '--user user', String, "The user for which to create the policy (defaults to '#{options[:user]}')") do |u|
options[:user] = u
end
end
argv = parse_options(opts)
return unless argv
wrapper_path = Vagrant::LXC.sudo_wrapper_path
wrapper = create_wrapper!
sudoers = create_sudoers!(options[:user], wrapper_path)
su_copy([
{source: wrapper, target: wrapper_path, mode: "0555"},
{source: sudoers, target: sudoers_path, mode: "0440"}
])
end
def sudoers_path
"/etc/sudoers.d/vagrant-lxc-#{Vagrant::LXC::VERSION.gsub( /\./, '-')}"
end
private
# REFACTOR: Make use ERB rendering after https://github.com/mitchellh/vagrant/issues/3231
# lands into core
def create_wrapper!
wrapper = Tempfile.new('lxc-wrapper').tap do |file|
file.puts "#!/opt/vagrant/embedded/bin/ruby"
file.puts "# Automatically created by vagrant-lxc"
file.puts <<-EOF
class Whitelist
class << self
def add(command, *args)
list[command] << args
end
def list
@list ||= Hash.new do |key, hsh|
key[hsh] = []
end
end
def allowed(command)
list[command] || []
end
def run!(argv)
begin
command, args = `which \#{argv.shift}`.chomp, argv || []
check!(command, args)
puts `\#{command} \#{args.join(" ")}`
exit $?.to_i
rescue => e
STDERR.puts e.message
exit 1
end
end
private
def check!(command, args)
allowed(command).each do |checks|
return if valid_args?(args, checks)
end
raise_invalid(command, args)
end
def valid_args?(args, checks)
return false unless valid_length?(args, checks)
check = nil
args.each_with_index do |provided, i|
check = checks[i] unless check == '**'
return false unless match?(provided, check)
end
true
end
def valid_length?(args, checks)
args.length == checks.length || checks.last == '**'
end
def match?(arg, check)
check == '**' || check.is_a?(Regexp) && !!check.match(arg) || arg == check
end
def raise_invalid(command, args)
raise "Invalid arguments for command \#{command}, " <<
"provided args: \#{args.inspect}"
end
end
end
base = "/var/lib/lxc"
base_path = %r{\\A\#{base}/.*\\z}
templates_path = %r{\\A/usr/(share|lib|lib64|local/lib)/lxc/templates/.*\\z}
##
# Commands from provider.rb
# - Check lxc is installed
Whitelist.add '/usr/bin/which', /\\Alxc-\\w+\\z/
##
# Commands from driver.rb
# - Container config file
Whitelist.add '/bin/cat', base_path
# - Shared folders
Whitelist.add '/bin/mkdir', '-p', base_path
# - Container config customizations and pruning
Whitelist.add '/bin/cp', '-f', %r{/tmp/.*}, base_path
Whitelist.add '/bin/chown', 'root:root', base_path
# - Template import
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Whitelist.add '/bin/cp', %r{\\A.*\\z}, templates_path
Whitelist.add '/bin/cp', %r{\\A.*\\z}, templates_path
Whitelist.add '/bin/cp', %r{\\A.*\\z}, templates_path
Whitelist.add '/bin/chmod', '+x', templates_path
# - Template removal
Whitelist.add '/bin/rm', templates_path
# - Packaging
Whitelist.add '/bin/tar', '--numeric-owner', '-cvzf', %r{/tmp/.*/rootfs.tar.gz}, '-C', base_path, './rootfs'
Whitelist.add '/bin/chown', /\\A\\d+:\\d+\\z/, %r{\\A/tmp/.*/rootfs\.tar\.gz\\z}
##
# Commands from driver/cli.rb
Whitelist.add '/usr/bin/lxc-version'
Whitelist.add '/usr/bin/lxc-ls'
Whitelist.add '/usr/bin/lxc-info', '--name', /.*/
Whitelist.add '/usr/bin/lxc-create', '-B', /.*/, '--template', /.*/, '--name', /.*/, '**'
Whitelist.add '/usr/bin/lxc-destroy', '--name', /.*/
Whitelist.add '/usr/bin/lxc-start', '-d', '--name', /.*/, '**'
Whitelist.add '/usr/bin/lxc-stop', '--name', /.*/
Whitelist.add '/usr/bin/lxc-shutdown', '--name', /.*/
Whitelist.add '/usr/bin/lxc-attach', '--name', /.*/, '**'
Whitelist.add '/usr/bin/lxc-attach', '-h'
##
# Commands from driver/action/remove_temporary_files.rb
Whitelist.add '/bin/rm', '-rf', %r{\\A\#{base}/.*/rootfs/tmp/.*}
# Watch out for stones
Whitelist.run!(ARGV)
EOF
end
wrapper.close
wrapper.path
end
# REFACTOR: Make use ERB rendering after https://github.com/mitchellh/vagrant/issues/3231
# lands into core
def create_sudoers!(user, command)
sudoers = Tempfile.new('vagrant-lxc-sudoers').tap do |file|
file.puts "# Automatically created by vagrant-lxc"
file.puts "#{user} ALL=(root) NOPASSWD: #{command}"
end
sudoers.close
sudoers.path
end
def su_copy(files)
commands = files.map { |file|
[
"rm -f #{file[:target]}",
"cp #{file[:source]} #{file[:target]}",
"chown root:root #{file[:target]}",
"chmod #{file[:mode]} #{file[:target]}"
]
}.flatten
system "echo \"#{commands.join("; ")}\" | sudo sh"
end
end
end
end
end