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							- #!/usr/bin/python3
 
- '''
 
- Copyright (c) 2013-2015 Phusion Holding B.V.
 
- Permission is hereby granted, free of charge, to any person obtaining a copy
 
- of this software and associated documentation files (the "Software"), to deal
 
- in the Software without restriction, including without limitation the rights
 
- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 
- copies of the Software, and to permit persons to whom the Software is
 
- furnished to do so, subject to the following conditions:
 
- The above copyright notice and this permission notice shall be included in
 
- all copies or substantial portions of the Software.
 
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 
- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 
- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 
- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 
- THE SOFTWARE.
 
- '''
 
- import sys
 
- import os
 
- import pwd
 
- def abort(message):
 
-     sys.stderr.write("setuser: %s\n" % message)
 
-     sys.exit(1)
 
- def main():
 
-     '''
 
-     A simple alternative to sudo that executes a command as a user by setting
 
-     the user ID and user parameters to those described by the system and then
 
-     using execvp(3) to execute the command without the necessity of a TTY
 
-     '''
 
-     username = sys.argv[1]
 
-     try:
 
-         user = pwd.getpwnam(username)
 
-     except KeyError:
 
-         abort("user %s not found" % username)
 
-     os.initgroups(username, user.pw_gid)
 
-     os.setgid(user.pw_gid)
 
-     os.setuid(user.pw_uid)
 
-     os.environ['USER'] = username
 
-     os.environ['HOME'] = user.pw_dir
 
-     os.environ['UID'] = str(user.pw_uid)
 
-     try:
 
-         os.execvp(sys.argv[2], sys.argv[2:])
 
-     except OSError as e:
 
-         abort("cannot execute %s: %s" % (sys.argv[2], str(e)))
 
- if __name__ == '__main__':
 
-     if len(sys.argv) < 3:
 
-         sys.stderr.write("Usage: /sbin/setuser USERNAME COMMAND [args..]\n")
 
-         sys.exit(1)
 
-     main()
 
 
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