lib/privileges/examples/drop_privileges.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2013 Alexis Laferrière <alexis.laf@xymus.net>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # Example using the privileges module to drop privileges from root
  18 module drop_privileges is example
  19
  20 import privileges
  21
  22 # basic command line options
  23 var opts = new OptionContext
  24 var opt_ug = new OptionUserAndGroup.for_dropping_privileges
  25 opt_ug.mandatory = true
  26 opts.add_option(opt_ug)
  27
  28 # parse and check command line options
  29 opts.parse(args)
  30 if not opts.errors.is_empty then
  31         print opts.errors.join("\n")
  32         print "Usage: drop_privileges [options]"
  33         opts.usage
  34         exit 1
  35 end
  36
  37 # original user
  38 print "before {sys.uid}:{sys.gid}"
  39
  40 # make the switch
  41 var user_group = opt_ug.value
  42 assert user_group != null
  43 user_group.drop_privileges
  44
  45 # final user
  46 print "after {sys.uid}:{sys.egid}"