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Overview

This utility creates packages that create local user accounts when installed. The packages can create users on 10.8+, and they are compatible with all workflows that can install standard installer pkgs. For the details on how the packages work, see Greg Neagle's article in the May 2012 issue of MacTech.

Security Notes

Packages created using this utility install a user account plist with ShadowHashData contaning a "SALTED-SHA512-PBKDF2" key derived from the provided password. This is the standard mechanism for storing user authentication data in macOS 10.8+.

If you enable automatic login the password is stored in a kcpassword file, which is merely obfuscated and not encrypted - extracting the password (no matter how strong) is trivial.

Credits

  • Code by Per Olofsson, per.olofsson@gu.se
  • User deployment method by Greg Neagle
  • Bash plist modification code by Michael Lynn

Version History

  • 1.2.5 (in beta)
    • Fixed automatic login on 10.9+ (thanks to Greg Neagle).
  • 1.2.4
    • Fixed permissions for users to change their name, password, picture, etc (thanks to Greg Collen).
  • 1.2.3
    • Allow packages with empty password (thanks to Dan Keller).
  • 1.2.2
    • Fixed automatic logins that only worked on 2nd boot (thanks to Joseph Chilcote).
  • 1.2.1
    • Fixed empty password hash when you clicked Save without leaving the Password/Verify field (thanks to ih84ds).
  • 1.2
    • Added automatic login using kcpassword.
    • Package now adds users to admin group instead of using primary group 80 (thanks to Michael Lynn, Jason Bush, Greg Neagle). Primary group is always 20.
  • 1.1
    • create_user.pkg files can now be opened for editing.
    • Added user picture.
    • App is now sandboxed.
  • 1.0.3
    • Fixed Package ID and Version being set incorrectly.
  • 1.0.2
    • Fixed ownership of items in package Payload.
    • Changed salted sha1 shadow hash to upper case which fixes authentication on 10.5 and 10.6 (thanks to Allister Banks).
  • 1.0.1
    • Fixed postinstall script for 10.6 (thanks to Allister Banks).
  • 1.0
    • Initial release.

License

Copyright 2012 Per Olofsson

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.